import of dnsmasq-2.17.tar.gz

CHANGELOG

@@ -821,5 +821,476 @@ release 2.3
 	     embedded systems without a stable RTC. Oleg Vdovikin
 	     helped work out how to make that work.
 
+release 2.4
+	     Fixed inability to start when the lease file doesn't
+	     already exist. Thanks to Dag Wieers for reporting that.
 
+	     Fixed problem were dhcp-host configuration options did
+	     not play well with entries in /etc/ethers for the same
+	     host. Thanks again to Dag Wieers.
 
+	     Tweaked DHCP code to favour moving to a newly-configured
+	     static IP address rather than an old lease when doing
+	     DHCP allocation.
+
+	     Added --alias configuration option. This provides IPv4
+	     rewrite facilities like Cisco "DNS doctoring". Suggested
+	     by Chad Skeeters.
+
+	     Fixed bug in /etc/ethers parsing code triggered by tab
+	     characters. Qudos to Dag Wieers for hepling to nail that
+	     one.
+ 	     
+	     Added "bind-interfaces" option correctly.	     
+
+release 2.5
+	     Made "where are we allocating addresses?" code in DHCP
+	     server cope with requests via a relay which is on a
+	     directly connected network for which there is not a
+	     configured netmask. This strange state of affairs occurs
+	     with win4lin. Thanks to Alex Melt and Jim Horner for bug
+	     reports and testing with this. 
+
+	     Fixed trivial-but-irritating missing #include which broke
+	     compilation on *BSD.
+
+	     Force --bind-interfaces if IP-aliased interface
+	     specifications are used, since the sockets API provides
+	     no other sane way to determine which alias of an
+	     interface a packet was sent to. Thanks to Javier Kohen
+	     for the bug report.
+
+release 2.6 
+	     Support Token Ring DHCP. Thanks to Dag Wieers for help
+	     testing. Note that Token ring support only works on Linux 
+	     currently.
+
+	     Fix compilation on MacOS X. Thanks to Bernhard Ehlers for
+	     the patch.
+
+	     Added new "ignore" keyword for
+	     dhcp-host. "dhcp-host=11:22:33:44:55:66,ignore" will
+	     cause the DHCP server to ignore any host with the given
+	     MAC address, leaving it to other servers on the
+	     network. This also works with client-id and hostnames.
+	     Suggestion by Alex Melt.
+
+	     Fixed parsing of hex client IDs. Problem spotted by Peter
+	     Fichtner.
+
+	     Allow conf-file options in configuration file, to
+	     provide an include function.
+	     
+	     Re-read /etc/ethers on receipt of SIGHUP.
+
+	     Added back the ability to read ISC dhcpd lease files, by
+	     popular demand. Note that this is deprecated and for
+	     backwards compatibility only. You can get back the 4K of
+	     memory that the code occupies by undefining
+	     "HAVE_ISC_READER" in src/config.h
+
+	     Added ability to disable "pool" DHCP address allocation
+	     whilst leaving static leases working. The syntax is
+	     "dhcp-range=192.168.0.0,static"
+	     Thanks to Grzegorz Nosek for the suggestion.
+
+	     Generalized dnsmasq-rh.spec file to work on Mandrake too,
+	     and removed dnsmasq-mdk.spec. Thanks to Doug Keller.
+
+	     Allow DHCP options which are tied to specific static
+	     leases in the same way as to specific networks.
+
+	     Generalised the dhcp-option parser a bit to allow hex
+	     strings as parameters. This is now legal:
+	     dhcp-option=128,e4:45:74:68:00:00
+	     Inspired by a patch from Joel Nordell.
+
+	     Changed the semantics of argument-less dhcp-options for
+	     the default-setting ones, ie 1, 3, 6 and 28. Now, doing
+	     eg, dhcp-option=3 stops dnsmasq from sending a default
+	     router option at all. Thanks to Scott Emmons for pointing
+	     out that this is useful.
+
+	     Fixed dnsmasq.conf parsing bug which interpreted port
+	     numbers in server= lines as a comment. To start a
+	     comment, a '#' character must now be a the start of a
+	     line or preceded by whitespace. Thanks to Christian
+	     Haggstrom for the bug report.
+
+release 2.7  
+             Allow the dhcp-host specification of id:* which makes 
+	     dnsmasq ignore any client-id. This is useful to ensure 
+	     that a dual-boot machine sees the same lease when one OS 
+	     gives a client-id and the other doesn't. It's also useful
+	     when PXE boot DHCP does not use client IDs but the OS it boots 
+             does. Thanks to Grzegorz Nosek for suggesting this enhancement.
+
+	     No longer assume that ciaddr is zero in received DHCPDISCOVER 
+	     messages, just for security against broken clients.
+
+	     Set default of siaddr field to the address of the machine running 
+             dnsmasq when not explicitly set using dhcp-boot
+             option. This is the ISC dhcpd behaviour.  
+
+             Send T1 and T2 options in DHCPOFFER packets. This is required
+	     by the DHCP client in some JetDirect printers. Thanks 
+             to Paul Mattal for work on this.
+
+	     Fixed bug with DHCP on OpenBSD reported by Dominique Jacquel.
+	     The code which added loopback interfaces to the list
+	     was confusing the DHCP code, which expected one interface only.
+	     Solved by adding loopback interfaces to address list instead.
+
+	     Add dhcp-vendorclass option to allow options to be sent only
+	     to certain classes of clients.
+
+	     Tweaked option search code so that if a netid-qualified
+	     option is used, any unqualified option is ignored.
+	     
+	     Changed the method of picking new dynamic IP
+	     addresses. This used to use the next consecutive
+	     address as long it was free, now it uses a hash
+	     from the client hardware address. This reduces the amount
+	     of address movement for clients which let their lease
+	     expire and allows consecutive DHCPOFFERS to the same host
+	     to (almost always) be for the same address, without
+	     storing state before a lease is granted.
+ 
+	     Tweaked option handling code to return all possible
+	     options rather than none when DHCP "requested options"
+	     field is missing. This fixes interoperability with
+	     ancient IBM LANMAN DHCP clients. Thanks to Jim Louvau for
+	     help with this.
+
+release 2.8
+	     Pad DHCP packets to a minimum size of 300 bytes. This
+	     fixes interoperability problems with the Linux in-kernel
+	     DHCP/BOOTP client. Thanks to Richard Musil for
+	     diagnosing this and supplying a patch.
+
+	     Fixed option-parsing bug and potential memory leak. Patch
+	     from Richard Musil.
+
+	     Improved vendor class configuration and added user class
+	     configuration. Specifically: (1) options are matched on
+	     the netids from dhcp-range, dhcp-host, vendor class and
+	     user class(es). Multiple net-ids are allowed and options
+	     are searched on them all. (2) matches agains vendor class
+	     and user class are now on a substring, if the given
+	     string is a substring of the vendor/user class, then a
+	     match occurs. Thanks again to Richard Musil for prompting
+	     this.
+
+	     Make "#" match any domain on --address and --server
+	     flags. --address=/#/1.2.3.4 will return 1.2.3.4 for _any_
+	     domain not otherwise matched. Of course
+	     --server=/#/1.2.3.4 is exactly equivalent to
+	     --server=1.2.3.4. Special request from Josh Howlett.
+	
+	     Fixed a nasty bug which would cause dnsmasq to lose track
+	     of leases for hosts which had a --dhcp-host flag without
+	     a name specification. The mechanism for this was that
+	     the hostname could get erroneously set as a zero-length
+	     string and then written to the leases file as a
+	     mal-formed line. Restarting dnsmasq would then lose the lease.
+	     Alex Hermann's work helped chase down this problem.
+
+	     Add checks against DHCP clients which return zero-length
+	     hostnames. This avoids the potential lease-loss problems
+	     reffered to above. Also, if a client sends a hostname when
+	     it creates a lease but subsequently sends no or a
+	     zero-length hostname whilst renewing, continue to use the
+	     existing hostname, don't wipe it out. 
+	     
+	     Tweaked option parsing to flag some parameter errors.
+
+release 2.9
+	     Fixed interface filter code for two effects: 1) Fixed bug
+	     where queries sent via loopback interface
+	     but to the address of another interface were ignored
+	     unless the loopback interface was explicitly configured.
+	     2) on OpenBSD failure to configure one interface now
+	     causes a fatal error on startup rather than an huge
+	     stream of log messages. Thanks to Erik Jan Tromp for 
+	     finding that bug.
+
+	     Changed server selection strategy to improve performance
+	     when there are many available servers and some are
+	     broken. The new algorithm is to pick as before for the
+	     first try, but if a query is retried, to send to all
+	     available servers in parallel. The first one to reply
+	     then becomes prefered for the next query. This should 
+	     improve reliability without generating significant extra
+	     upstream load.
+
+	     Fixed breakage of special servers/addresses for
+	     unqualified domains introduced in version 2.8 
+	      
+	     Allow fallback to "bind-interfaces" at runtime: Some
+	     verions of *BSD seem to have enough stuff in the header
+	     files to build but no kernel support. Also now log if
+	     "bind-interfaces" is forced on.
+
+	     Log replies from upstream servers which refuse to do
+	     recursion - dnsmasq is not a recursive nameserver and
+	     relies on upstream servers to do the recursion, this
+	     flags a configuration error.
+
+	     Disable client-id matching for hosts whose MAC address is
+	     read from /etc/ethers. Patch from Oleg I. Vdovikin.
+
+	     Extended --mx-host flag to allow arbitrary targets for MX
+	     records, suggested by Moritz Bunkus.
+
+	     Fixed build under NetBSD 2.0 - thanks to Felix Deichmann
+	     for the patch.
+	     
+	     Deal correctly with repeated addresses in /etc/hosts. The
+	     first name found is now returned for reverse lookups,
+	     rather than all of them.
+
+	     Add back fatal errors when nonexistant 
+	     interfaces or interface addresses are given but only in
+	     "bind-interfaces" mode. Principle of least surprise applies.
+	     
+	     Allow # as the argument to --domain, meaning "read the
+	     domain from the first search directive in
+	     /etc.resolv.conf". Feature suggested by Evan Jones.
+
+release 2.10
+	    Allow --query-port to be set to a low port by creating and
+	    binding the socket before dropping root. (Suggestion from
+	    Jamie Lokier) 
+
+	    Support TCP queries. It turned out to be possible to do
+	    this with a couple of hundred lines of code, once I knew
+	    how. The executable size went up by a few K on i386.
+	    There are a few limitations: data obtained via TCP is not
+	    cached, and dynamically-created interfaces may break under
+	    certain circumstances. Source-address or query-port
+	    specifications are ignored for TCP.
+
+	    NAK attempts to renew a DHCP lease where the DHCP range
+	    has changed and the lease is no longer in the allowed
+	    range. Jamie Lokier pointed out this bug.
+
+	    NAK attempts to renew a pool DHCP lease when a statically
+	    allocated address has become available, forcing a host to
+	    move to it's allocated address. Lots of people have
+	    suggested this change and been rebuffed (they know who
+	    they are) the straws that broke the camel's back were Tim
+	    Cutts and Jamie Lokier.
+
+	    Remove any nameserver records from answers which are
+	    modified by --alias flags. If the answer is modified, it
+	    cannot any longer be authoritative.
+
+	    Change behaviour of "bogus-priv" option to return NXDOMAIN
+	    rather than a PTR record with the dotted-quad address as
+	    name. The new behaviour doesn't provoke tcpwrappers like
+	    the old behavior did.
+
+	    Added a patch for the Suse rpm. That changes the default
+	    group to one suitable for Suse and disables inclusion of
+	    the ISC lease-file reader code. Thanks to Andy Cambeis for
+	    his ongoing work on Suse packaging.
+
+	    Support forwarding of EDNS.0 The maximum UDP packet size 
+	    defaults to 1280, but may be changed with the
+	    --edns-packet-max option. Detect queries with the do bit
+	    set and always forward them, since DNSSEC records are 
+	    not cached. This behaviour is required to make
+	    DNSSECbis work properly though dnsmasq. Thanks to Simon
+	    Josefsson for help with this.
+
+	    Move default config file location under OpenBSD from
+	    /usr/local/etc/dnsmasq.conf to /etc/dnsmasq.conf. Bug
+	    report from Jonathan Weiss.
+
+	    Use a lease with matching MAC address for a host which
+	    doesn't present a client-id, even if there was a client ID 
+	    at some point in the past. This reduces surprises when
+	    changing DHCP clients, adding id:* to a host, and from the
+	    semantics change of /etc/ethers in 2.9. Thanks to Bernard
+	    Sammer for finding that.
+
+	    Added a "contrib" directory and in it the dnslist utility,
+	    from Thomas Tuttle.
+
+	    Fixed "fail to start up" problems under Linux with IPv6
+	    enabled. It's not clear that these were an issue in
+	    released versions, but they manifested themselves when TCP
+	    support was added. Thanks to Michael Hamilton for
+	    assistance with this.
+
+version 2.11
+	    Fixed DHCP problem which could result in two leases in the
+            database with the same address. This looked much more
+            alarming then it was, since it could only happen when a
+            machine changes MAC address but kept the same name. The
+            old lease would persist until it timed out but things
+            would still work OK. 
+
+	    Check that IP addresses in all dhcp-host directives are
+	    unique and die horribly if they are not, since otherwise
+	    endless protocol loops can occur. 
+	    
+	    Use IPV6_RECVPKTINFO as socket option rather than
+	    IPV6_PKTINFO where available. This keeps late-model FreeBSD
+	    happy.
+
+	    Set source interface when replying to IPv6 UDP
+	    queries. This is needed to cope with link-local addresses.
+
+version 2.12
+            Added extra checks to ensure that DHCP created DNS entries 
+	    cannot generate multiple DNS address->name entries. Thanks to 
+	    Stefan Monnier for finding the exact set of configuration
+            options which could create this.
+
+	    Don't set the the filterwin2k option in the example config
+	    file and add warnings that is breaks Kerberos. Thanks to
+	    Simon Josefsson and Timothy Folks for pointing that out.
+	    
+	    Log types of incoming queries as well as source and domain.
+
+	    Log NODATA replies generated as a result of the
+	    filterwin2k option.
+
+version 2.13
+	    Fixed crash with un-named DHCP hosts introduced in 2.12.
+	    Thanks to Nicolo Wojewoda and Gregory Gathy for bug reports.
+
+version 2.14
+	    Fix DHCP network detection for hosts which talk via a
+	    relay. This makes lease renewal for such hosts work
+	    correctly.
+
+	    Support RFC3011 subnet selectors in the DHCP server.
+
+	    Fix DHCP code to generate RFC-compliant responses
+            to hosts in the INIT-REBOOT state.
+
+	    In the DHCP server, set the receive buffer size on 
+	    the transmit-only packet socket to zero, to avoid 
+	    waste of kernel buffers.
+
+	    Fix DHCP address allocation code to use the whole of
+	    the DHCP range, including the start and end addresses.
+	    
+	    Attempt an ICMP "ping" on new addresses before allocating 
+	    them to leases, to avoid allocating addresses which are in use.
+
+	    Handle rfc951 BOOTP as well as DHCP for hosts which have
+	    MAC address to IP address mapping defined.
+
+	    Fix compilation under MacOS X. Thanks to Chris Tomlinson.
+
+	    Fix compilation under NetBSD. Thanks to Felix Deichmann.
+
+	    Added "keep-in-foreground" option. Thanks to Sean
+	    MacLennan for the patch.
+
+version 2.15
+            Fixed NXDOMAIN/NODATA confusion for locally known
+            names. We now return a NODATA reponse for names which are
+            locally known. Now a query for (eg AAAA or MX) for a name
+	    with an IPv4 address in /etc/hosts which fails upstream
+            will generate a NODATA response. Note that the query 
+	    is still tried upstream, but a NXDOMAIN reply gets
+            converted to NODATA. Thanks to Eric de Thouars, Eric
+            Spakman and Mike Mestnik for bug reports/testing.
+
+	    Allow multiple dhcp-ranges within the same network. The
+	    original intention was that there would be a dhcp-range
+	    option for each network served, but there's no real reason
+	    not to allow discontinuous ranges within a network so this
+	    release adds support for that.
+
+	    Check for dhcp-ranges which are inconsistent with their 
+	    netmask, and generate errors or warnings.
+	    
+	    Improve error messages when there are problems with
+	    configuration.
+
+version 2.16
+	    Fixed typo in OpenBSD-only code which stopped compilation
+            under that OS. Chris Weinhaupl gets credit for reporting 
+            this.
+
+	    Added dhcp-authoritative option which restores non-RFC 
+	    compliant but desirable behaviour of pre-2.14 versions and
+            avoids long timeouts while DHCP clients try to renew leases
+            which are unknown to dnsmasq. Thanks to John Mastwijk for 
+	    help with this.	 
+
+	    Added support to the DHCP option code to allow RFC-3397 
+	    domain search DHCP option (119) to be sent.
+
+            Set NONBLOCK on all listening sockets to workaround non-POSIX
+            compliance in Linux 2.4 and 2.6. This fixes rare hangs which
+            occured when corrupted packets were received. Thanks to
+	    Joris van Rantwijk for chasing that down.
+ 
+	    Updated config.h for NetBSD. Thanks to Martin Lambers.
+
+            Do a better job of distinguishing between retransmissions
+	    and new queries when forwarding. This fixes a bug
+	    triggered by the polipo web cache which sends A and AAAA
+	    queries both with the same transaction-ID. Thanks to 
+	    Joachim Berdal Haga and Juliusz Chroboczek for help with this.
+
+	    Rewrote cache code to store CNAMES, rather then chasing
+	    them before storage. This eliminates bad situations when
+	    clients get inconsistent views depending on if data comes
+	    from the cache.
+
+	    Allow for more than one --addn-hosts flag.
+
+	    Clarify logged message when a DHCP lease clashes with an
+	    /etc/hosts entry. Thanks to Mat Swift for the suggestion.
+
+	    Added dynamic-dnsmasq from Peter Willis to the contrib
+	    section.
+
+version 2.17
+	    Correctly deduce the size of numeric dhcp-options, rather
+	    than making wild guesses. Also cope with negative values.
+
+	    Fixed use of C library reserved symbol "index" which broke
+	    under certain combinations of library and compiler.
+
+	    Make bind-interfaces work for IPv6 interfaces too.
+
+	    Warn if an interface is given for listening which doesn't
+	    currently exist when not in bind-interfaces mode. (This is
+	    already a fatal error when bind-interfaces is set.)
+
+	    Allow the --interface and --except-interface options to
+	    take a comma-seperated list of interfaces.
+
+	    Tweak --dhcp-userclass matching code to work with the
+	    ISC dhclient which violates RFC3004 unless its
+	    configuration is very warped. Thanks to Cedric Duval for
+	    the bug report. 
+
+	    Allow more than one network-id tag in a dhcp-option. All
+	    the tags must match to enable the option.
+
+	    Added dhcp-ignore option to disable classes of hosts based
+	    on network-id tags. Also allow BOOTP options to be
+	    controlled by network tags.
+
+	    Fill in sname, file and siaddr fields in replies to
+	    DHCPINFORM messages.
+
+	    Don't send NAK replies to DHCPREQUEST packets for disabled
+	    clients. Credit to Cedric Duval for spotting this.
+
+	    Fix rare crash associated with long DNS names and CNAME
+	    records. Thanks to Holger_Hoffstatte and especially Steve
+	    Grecni for help chasing that one down.
+
+ 
+
+	    

FAQ

@@ -20,12 +20,10 @@ A: The high ports that dnsmasq opens is for replies from the upstream
 Q: Why doesn't dnsmasq support DNS queries over TCP? Don't the RFC's specify
    that?
 
-A: Yes, they do, so technically dnsmasq is not RFC-compliant. In practice, the
-   sorts of queries which dnsmasq is used for are always sent via UDP. Adding 
-   TCP support would make dnsmasq much more heavyweight for no practical 
-   benefit. If you really want to do zone transfers, forward port 53 TCP 
-   using in-kernel port-forwarding or a port-fowarder like rinetd.
-
+A: Update: from version 2.10, it does. There are a few limitations:
+   data obtained via TCP is not cached, and dynamically-created
+   interfaces may break under certain circumstances. Source-address
+   or query-port specifications are ignored for TCP.
 
 Q: When I send SIGUSR1 to dump the contents of the cache, some entries have
    no IP address and are for names like mymachine.mydomain.com.mydomain.com.
@@ -74,6 +72,8 @@ A: Use the standard DNS convention of <reversed address>.in-addr.arpa.
    For instance to send reverse queries on the range 192.168.0.0 to 
    192.168.0.255 to a nameserver at 10.0.0.1 do
    server=/0.168.192.in-addr.arpa/10.0.0.1
+   Note that the "bogus-priv" option take priority over this option,
+   so the above will not work when the bogus-priv option is set.
 
 Q: Dnsmasq fails to start with an error like this: "dnsmasq: bind
    failed: Cannot assign requested address". What's the problem?
@@ -181,9 +181,125 @@ A: There are a couple of configuration gotchas which have been
    and from ports 67 and 68 and broadcast packets with source 
    address 0.0.0.0 and destination address 255.255.255.255 are not 
    dropped by iptables/ipchains.
+
+Q: I'm running Debian, and my machines get an address fine with DHCP,
+   but their names are not appearing in the DNS.
+
+A: By default, none of the DHCP clients send the host-name when asking
+   for a lease. For most of the clients, you can set the host-name to
+   send with the "hostname" keyword in /etc/network/interfaces. (See
+   "man interfaces" for details.) That doesn't work for dhclient, were
+   you have to add something like "send host-name daisy" to
+   /etc/dhclient.conf [Update: the lastest dhcpcd packages _do_ send
+   the hostname by default.
+
+Q: I'm network booting my machines, and trying to give them static
+   DHCP-assigned addresses. The machine gets its correct address
+   whilst booting, but then the OS starts and it seems to get
+   allocated a different address.
+
+A: What is happening is this: The boot process sends a DHCP
+   request and gets allocated the static address corresponding to its
+   MAC address. The boot loader does not send a client-id. Then the OS
+   starts and repeats the DHCP process, but it it does send a
+   client-id. Dnsmasq cannot assume that the two requests are from the
+   same machine (since the client ID's don't match) and even though
+   the MAC address has a static allocation, that address is still in
+   use by the first incarnation of the machine (the one from the boot,
+   without a client ID.) dnsmasq therefore has to give the machine a
+   dynamic address from its pool. There are three ways to solve this:
+   (1) persuade your DHCP client not to send a client ID, or (2) set up
+   the static assignment to the client ID, not the MAC address. The
+   default client-id will be 01:<MAC address>, so change the dhcp-host
+   line from "dhcp-host=11:22:33:44:55:66,1.2.3.4" to
+   "dhcp-host=id:01:11:22:33:44:55:66,1.2.3.4" or (3) tell dnsmasq to
+   ignore client IDs for a particular MAC address, like this:
+   dhcp-host=11:22:33:44:55:66,id:*
+
+Q: What network types are supported by the DHCP server?
   
+A: Ethernet (and 802.11 wireless) are supported on all platforms. On
+   Linux Token Ring is also supported.
+
+Q: What is this strange "bind-interface" option?
+
+A: The DNS spec says that the reply to a DNS query must come from the
+   same address it was sent to. The traditional way to write an UDP
+   server to do this is to find all of the addresses belonging to the
+   machine (ie all the interfaces on the machine) and then create a
+   socket for each interface which is bound to the address of the
+   interface. Then when a packet is sent to address A, it is received
+   on the socket bound to address A and when the reply is also sent
+   via that socket, the source address is set to A by the kernel and
+   everything works. This is the how dnsmasq works when
+   "bind-interfaces" is set, with the obvious extension that is misses
+   out creating sockets for some interfaces depending on the
+   --interface, --address and --except-interface flags.  The
+   disadvantage of this approach is that it breaks if interfaces don't
+   exist or are not configured when the daemon starts and does the
+   socket creation step. In a hotplug-aware world this is a real
+   problem.
+
+   The alternative approach is to have only one socket, which is bound
+   to the correct port and the wildcard IP address (0.0.0.0). That
+   socket will receive _all_ packets sent to port 53, no matter what
+   destination address they have. This solves the problem of
+   interfaces which are created or reconfigured after daemon
+   start-up. To make this work is more complicated because of the
+   "reply source address" problem. When a UDP packet is sent by a
+   socket bound to 0.0.0.0 its source address will be set to the
+   address of one of the machine's interfaces, but which one is not
+   determined and can vary depending on the OS being run. To get round
+   this it is neccessary to use a scary advanced API to determine the
+   address to which a query was sent, and force that to be the source
+   address in the reply. For IPv4 this stuff in non-portable and quite
+   often not even available (It's different between FreeBSD 5.x and
+   Linux, for instance, and FreeBSD 4.x, Linux 2.0.x and OpenBSD don't
+   have it at all.) Hence "bind-interfaces" has to always be available
+   as a fall back. For IPv6 the API is standard and universally
+   available.
+
+   It could be argued that if the --interface or --address flags are
+   used then binding interfaces is more appropriate, but using
+   wildcard binding means that dnsmasq will quite happily start up
+   after being told to use interfaces which don't exist, but which are
+   created later. Wildcard binding breaks the scenario when dnsmasq is
+   listening on one interface and another server (most probably BIND)
+   is listening on another. It's not possible for BIND to bind to an
+   (address,port) pair when dnsmasq has bound (wildcard,port), hence
+   the ability to explicitly turn off wildcard binding.
+
+Q: Why doesn't Kerberos work/why can't I get sensible answers to
+   queries for SRV records.
+
+A: Probably because you have the "filterwin2k" option set. Note that
+   it was on by default in example configuration files included in 
+   versions before 2.12, so you might have it set on without
+   realising.
+
+Q: Can I get email notification when a new version of dnsmasq is
+   released?
+
+A: Yes, new releases of dnsmasq are always announced through
+   freshmeat.net, and they allow you to subcribe to email alerts when
+   new versions of particular projects are released.
+
+Q: What does the dhcp-authoritative option do? 
+
+A: See http://www.isc.org/index.pl?/sw/dhcp/authoritative.php - that's
+   for the ISC daemon, but the same applies to dnsmasq.
+
+Q: Why does my Gentoo box pause for a minute before getting a new
+   lease?
+
+A: Because when a Gentoo box shuts down, it releases its lease with
+   the server but remembers it on the client; this seems to be a 
+   Gentoo-specific patch to dhcpcd. On restart it tries to renew
+   a lease which is long gone, as far as dnsmasq is concerned, and
+   dnsmasq ignores it until is times out and restarts the process.
+   To fix this, set the dhcp-authoritative flag in dnsmasq.
 
 
 
 
-
+	      

Makefile

@@ -10,7 +10,7 @@ all :
 	@cd $(SRC); $(MAKE) dnsmasq 
 
 clean :
-	rm -f *~ */*~ $(SRC)/*.o $(SRC)/dnsmasq core build
+	rm -f *~ contrib/*/*~ */*~ $(SRC)/*.o $(SRC)/dnsmasq core build
 
 install : all
 	install -d $(DESTDIR)$(BINDIR) -d $(DESTDIR)$(MANDIR)/man8

UPGRADING_to_2.0

@@ -7,9 +7,11 @@ Version 1.x of dnsmasq includes a facility for reading the dhcp.leases
 file written by ISC dhcpd. This allows the names of machines which
 have addresses allocated by DHCP to be included in the DNS.
 
-Version 2.x of dnsmasq removes the ISC dhcpd integration and replaces
-it with a DHCP server integrated into dnsmasq. This is an incompatible
-change in dnsmasq but it has the following advantages:
+Version 2.x of dnsmasq replaces the ISC dhcpd integration with a DHCP 
+server integrated into dnsmasq. Versions 2.0-2.5 removed the ISC 
+integration completely, but in version 2.6 it was re-enabled for 
+backwards compatibility purposes. The change to an integrated DHCP 
+server has the following advantages:
 
 * Small. ISC dhcpd is a large and comprehensive DHCP solution. The
   dnsmasq DHCP server adds about 15k to DNS-only dnsmasq and provides
@@ -29,7 +31,6 @@ change in dnsmasq but it has the following advantages:
   with the dnsmasq DHCP server.
 
 
-
        DHCP configuration
        ------------------
 
@@ -55,9 +56,9 @@ in the same way as before.
 Having started dnsmasq, tell any hosts on the network to renew their
 DHCP lease, so that dnsmasq's  DHCP server becomes aware of them. For
 Linux, this is best done by killing-and-restarting the DHCP client
-daemon or taking the network interface down and then back up. For
-Windows use winipcfg.exe
-
+daemon or taking the network interface down and then back up. For 
+Windows 9x/Me, use the graphical tool "winipcfg". For Windows
+NT/2000/XP, use the command-line "ipconfig /renew"
 
 For more complex DHCP configuration, refer to the doc/setup.html, the
 dnsmasq manpage and the annotated example configuration file. Also

contrib/dnslist/dhcp.css

@@ -0,0 +1,57 @@
+body
+{
+	font-family: sans-serif;
+	color: #000;
+}
+
+h1
+{
+	font-size: medium;
+	font-weight: bold;
+}
+
+h1 .updated
+{
+	color: #999;
+}
+
+table
+{
+	border-collapse: collapse;
+	border-bottom: 2px solid #000;
+}
+
+th
+{
+	background: #DDD;
+	border-top: 2px solid #000;
+	text-align: left;
+	font-weight: bold;
+}
+
+/* Any row */
+
+tr
+{
+	border-top: 2px solid #000;
+}
+
+/* Any row but the first or second (overrides above rule) */
+
+tr + tr + tr
+{
+	border-top: 2px solid #999;
+}
+
+tr.offline td.hostname
+{
+	color: #999;
+}
+
+.hostname   { width: 10em; }
+.ip_addr    { width: 10em; background: #DDD; }
+.ether_addr { width: 15em; }
+.client_id  { width: 15em; background: #DDD; }
+.status     { width: 5em;  }
+.since      { width: 10em; background: #DDD; }
+.lease      { width: 10em; }

contrib/dnslist/dnslist.pl

@@ -0,0 +1,608 @@
+#!/usr/bin/perl
+
+# dnslist - Read state file from dnsmasq and create a nice web page to display
+#           a list of DHCP clients.
+# 
+# Copyright (C) 2004  Thomas Tuttle
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTIBILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program*; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+# 
+# * The license is in fact included at the end of this file, and can
+#   either be viewed by reading everything after "__DATA__" or by
+#   running dnslist with the '-l' option.
+# 
+# Version: 0.2
+# Author:  Thomas Tuttle
+# Email:   dnslist.20.thinkinginbinary@spamgourmet.org
+# License: GNU General Public License, version 2.0
+#
+# v. 0.0: Too ugly to publish, thrown out.
+#
+# v. 0.1: First rewrite.
+#         Added master host list so offline hosts can still be displayed.
+#         Fixed modification detection (a newer modification time is lower.)
+#
+# v. 0.2: Fixed Client ID = "*" => "None"
+#         Fixed HTML entities (a client ID of ????<? screwed it up)
+#         Fixed command-line argument processing (apparently, "shift @ARGV" !=
+#             "$_ = shift @ARGV"...)
+#         Added license information.
+
+use Template;
+
+# Location of state file.  (This is the dnsmasq default.)
+# Change with -s <file>
+my $dnsmasq_state_file = '/var/lib/misc/dnsmasq.leases';
+# Location of template.  (Assumed to be in current directory.)
+# Change with -t <file>
+my $html_template_file = 'dnslist.tt2';
+# File to write HTML page to.  (This is where Slackware puts WWW pages.  It may
+# be different on other systems.  Make sure the permissions are set correctly
+# for it.)
+my $html_output_file = '/var/www/htdocs/dhcp.html';
+# Time to wait after each page update.  (The state file is checked for changes
+# before each update but is not read in each time, in case it is very big.  The
+# page is rewritten just so the "(updated __/__ __:__:__)" text changes ;-)
+my $wait_time = 2;
+
+# Read command-line arguments.
+while ($_ = shift @ARGV) {
+	if (/-s/) { $dnsmasq_state_file = shift; next; }
+	if (/-t/) { $html_template_file = shift; next; }
+	if (/-o/) { $html_output_file = shift;   next; }
+	if (/-d/) { $wait_time = shift;          next; }
+	if (/-l/) { show_license();              exit; }
+	die "usage: dnslist [-s state_file] [-t template_file] [-o output_file] [-d delay_time]\n";
+}
+
+# Master list of clients, offline and online.
+my $list = {};
+# Sorted host list.  (It's actually sorted by IP--the sub &byip() compares two
+# IP addresses, octet by octet, and figures out which is higher.)
+my @hosts = ();
+# Last time the state file was changed.
+my $last_state_change;
+
+# Check for a change to the state file.
+sub check_state {
+	if (defined $last_state_change) {
+		if (-M $dnsmasq_state_file < $last_state_change) {
+			print "check_state: state file has been changed.\n";
+			$last_state_change = -M $dnsmasq_state_file;
+			return 1;
+		} else {
+			return 0;
+		}
+	} else {
+		# Last change undefined, so we are running for the first time.
+		print "check_state: reading state file at startup.\n";
+		read_state();
+		$last_state_change = -M $dnsmasq_state_file;
+		return 1;
+	}
+}
+
+# Read data in state file.
+sub read_state {
+	my $old;
+	my $new;
+	# Open file.
+	unless (open STATE, $dnsmasq_state_file) {
+		warn "read_state: can't open $dnsmasq_state_file!\n";
+		return 0;
+	}
+	# Mark all hosts as offline, saving old state.
+	foreach $ether (keys %{$list}) {
+		$list->{$ether}->{'old_online'} = $list->{$ether}->{'online'};
+		$list->{$ether}->{'online'} = 0;
+	}
+	# Read hosts.
+	while (<STATE>) {
+		chomp;
+		@host{qw/raw_lease ether_addr ip_addr hostname raw_client_id/} = split /\s+/;
+		$ether = $host{ether_addr};
+		# Mark each online host as online.
+		$list->{$ether}->{'online'} = 1;
+		# Copy data to master list.
+		foreach $key (keys %host) {
+			$list->{$ether}->{$key} = $host{$key};
+		}
+	}
+	close STATE;
+	# Handle changes in offline/online state.  (The sub &do_host() handles
+	# all of the extra stuff to do with a host's data once it is read.
+	foreach $ether (keys %{$list}) {
+		$old = $list->{$ether}->{'old_online'};
+		$new = $list->{$ether}->{'online'};
+		if (not $old) {
+			if (not $new) {
+				do_host($ether, 'offline');
+			} else {
+				do_host($ether, 'join');
+			}
+		} else {
+			if (not $new) {
+				do_host($ether, 'leave');
+			} else {
+				do_host($ether, 'online');
+			}
+		}
+	}
+	# Sort hosts by IP ;-)
+	@hosts = sort byip values %{$list};
+	# Copy sorted list to template data store.
+	$data->{'hosts'} = [ @hosts ];
+}
+
+# Do stuff per host.
+sub do_host {
+	my ($ether, $status) = @_;
+	
+	# Find textual representation of DHCP client ID.
+	if ($list->{$ether}->{'raw_client_id'} eq '*') {
+		$list->{$ether}->{'text_client_id'} = 'None';
+	} else {
+		my $text = "";
+		foreach $char (split /:/, $list->{$ether}->{'raw_client_id'}) {
+			$char = pack('H2', $char);
+			if (ord($char) >= 32 and ord($char) <= 127) {
+				$text .= $char;
+			} else {
+				$text .= "?";
+			}
+		}
+		$list->{$ether}->{'text_client_id'} = $text;
+	}
+		
+	# Convert lease expiration date/time to text.
+	if ($list->{$ether}->{'raw_lease'} == 0) {
+		$list->{$ether}->{'text_lease'} = 'Never';
+	} else {
+		$list->{$ether}->{'text_lease'} = nice_time($list->{$ether}->{'raw_lease'});
+	}
+	
+	if ($status eq 'offline') {
+		# Nothing to do.
+	} elsif ($status eq 'online') {
+		# Nothing to do.
+	} elsif ($status eq 'join') {
+		# Update times for joining host.
+		print "do_host: $ether joined the network.\n";
+		$list->{$ether}->{'join_time'} = time;
+		$list->{$ether}->{'since'} = nice_time(time);
+	} elsif ($status eq 'leave') {
+		# Update times for leaving host.
+		print "do_host: $ether left the network.\n";
+		$list->{$ether}->{'leave_time'} = time;
+		$list->{$ether}->{'since'} = nice_time(time);
+	}
+	
+}
+
+# Convert time to a string representation.
+sub nice_time {
+	my $time = shift;
+	my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $dst) = localtime($time);
+	$sec = pad($sec, '0', 2);
+	$min = pad($min, '0', 2);
+	$hour = pad($hour, '0', 2);
+	$mon = pad($mon, '0', 2);
+	$mday = pad($mday, '0', 2);
+	return "$mon/$mday $hour:$min:$sec";
+}
+
+# Pad string to a certain length by repeatedly prepending another string.
+sub pad {
+	my ($text, $pad, $length) = @_;
+	while (length($text) < $length) {
+		$text = "$pad$text";
+	}
+	return $text;
+}
+
+# Compare two IP addresses.  (Uses $a and $b from sort.)
+sub byip {
+	# Split into octets.
+	my @a = split /\./, $a->{ip_addr};
+	my @b = split /\./, $b->{ip_addr};
+	# Compare octets.
+	foreach $n (0..3) {
+		return $a[$n] <=> $b[$n] if ($a[$n] != $b[$n]);
+	}
+	# If we get here there is no difference.
+	return 0;
+}
+		
+# Output HTML file.
+sub write_output {
+	# Create new template object.
+	my $template = Template->new(
+		{
+			ABSOLUTE => 1, # /var/www/... is an absolute path
+			OUTPUT => $html_output_file # put it here, not STDOUT
+		}
+	);
+	$data->{'updated'} = nice_time(time); # add "(updated ...)" to file
+	unless ($template->process($html_template_file, $data)) { # do it
+		warn "write_output: Template Toolkit error: " . $template->error() . "\n";
+		return 0;
+	}
+	print "write_output: page updated.\n";
+	return 1;
+}
+
+sub show_license {
+	while (<DATA>) {
+		print;
+		$line++;
+		if ($line == 24) { <>; $line = 1; }
+	}
+}
+
+# Main loop.
+while (1) {
+	# Check for state change.
+	if (check_state()) {
+		read_state();
+		sleep 1; # Sleep for a second just so we don't wear anything
+		         # out.  (By not sleeping the whole time after a change
+			 # we can detect rapid changes more easily--like if 300
+			 # hosts all come back online, they show up quicker.)
+	} else {
+		sleep $wait_time; # Take a nap.
+	}
+	write_output(); # Write the file anyway.
+}
+__DATA__
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
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+
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+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.

contrib/dnslist/dnslist.tt2

@@ -0,0 +1,32 @@
+<html>
+	<head>
+		<title>DHCP Clients</title>
+		<link rel="stylesheet" href="dhcp.css"/>
+		<meta http-equiv="Refresh" content="2"/>
+	</head>
+	<body>
+		<h1>DHCP Clients <span class="updated">(updated [% updated %])</span></h1>
+		<table cols="7">
+		<tr>
+			<th class="hostname">Hostname</th>
+			<th class="ip_addr">IP Address</th>
+			<th class="ether_addr">Ethernet Address</th>
+			<th class="client_id">DHCP Client ID</th>
+			<th class="status">Status</th>
+			<th class="since">Since</th>
+			<th class="lease">Lease Expires</th>
+		</tr>
+		[% FOREACH host IN hosts %]
+			<tr class="[% IF host.online %]online[% ELSE %]offline[% END %]">
+				<td class="hostname">[% host.hostname %]</td>
+				<td class="ip_addr">[% host.ip_addr %]</td>
+				<td class="ether_addr">[% host.ether_addr %]</td>
+				<td class="client_id">[% host.text_client_id %] ([% host.raw_client_id %])</td>
+				<td class="status">[% IF host.online %]Online[% ELSE %]Offline[% END %]</td>
+				<td class="since">[% host.since %]</td>
+				<td class="lease">[% host.text_lease %]</td>
+			</tr>
+		[% END %]
+		</table>
+	</body>
+</html>

contrib/dynamic-dnsmasq/dynamic-dnsmasq.pl

@@ -0,0 +1,249 @@
+#!/usr/bin/perl
+# dynamic-dnsmasq.pl - update dnsmasq's internal dns entries dynamically
+# Copyright (C) 2004  Peter Willis
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+# 
+# the purpose of this script is to be able to update dnsmasq's dns
+# records from a remote dynamic dns client.
+# 
+# basic use of this script:
+# dynamic-dnsmasq.pl add testaccount 1234 testaccount.mydomain.com
+# dynamic-dnsmasq.pl listen &
+# 
+# this script tries to emulate DynDNS.org's dynamic dns service, so
+# technically you should be able to use any DynDNS.org client to
+# update the records here. tested and confirmed to work with ddnsu
+# 1.3.1. just point the client's host to the IP of this machine,
+# port 9020, and include the hostname, user and pass, and it should
+# work.
+# 
+# make sure "addn-hosts=/etc/dyndns-hosts" is in your /etc/dnsmasq.conf
+# file and "nopoll" is commented out.
+
+use strict;
+use IO::Socket;
+use MIME::Base64;
+use DB_File;
+use Fcntl;
+
+my $accountdb = "accounts.db";
+my $recordfile = "/etc/dyndns-hosts";
+my $dnsmasqpidfile = "/var/run/dnsmasq.pid"; # if this doesn't exist, will look for process in /proc
+my $listenaddress = "0.0.0.0";
+my $listenport = 9020;
+
+# no editing past this point should be necessary
+
+if ( @ARGV < 1 ) {
+	die "Usage: $0 ADD|DEL|LISTUSERS|WRITEHOSTSFILE|LISTEN\n";
+} elsif ( lc $ARGV[0] eq "add" ) {
+	die "Usage: $0 ADD USER PASS HOSTNAME\n" unless @ARGV == 4;
+	add_acct($ARGV[1], $ARGV[2], $ARGV[3]);
+} elsif ( lc $ARGV[0] eq "del" ) {
+	die "Usage: $0 DEL USER\n" unless @ARGV == 2;
+	print "Are you sure you want to delete user \"$ARGV[1]\"? [N/y] ";
+	my $resp = <STDIN>;
+	chomp $resp;
+	if ( lc substr($resp,0,1) eq "y" ) {
+		del_acct($ARGV[1]);
+	}
+} elsif ( lc $ARGV[0] eq "listusers" or lc $ARGV[0] eq "writehostsfile" ) {
+	my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+	my $fh;
+	if ( lc $ARGV[0] eq "writehostsfile" ) {
+        	open($fh, ">$recordfile") || die "Couldn't open recordfile \"$recordfile\": $!\n";
+	       	flock($fh, 2);
+	       	seek($fh, 0, 0);
+	       	truncate($fh, 0);
+        }
+	while ( my ($key, $val) = each %h ) {
+		my ($pass, $domain, $ip) = split("\t",$val);
+		if ( lc $ARGV[0] eq "listusers" ) {
+			print "user $key, hostname $domain, ip $ip\n";
+		} else {
+			if ( defined $ip ) {
+				print $fh "$ip\t$domain\n";
+			}
+		}
+	}
+	if ( lc $ARGV[0] eq "writehostsfile" ) {
+		flock($fh, 8);
+		close($fh);
+		dnsmasq_rescan_configs();
+	}
+	undef $X;
+	untie %h;
+} elsif ( lc $ARGV[0] eq "listen" ) {
+	listen_for_updates();
+}
+
+sub listen_for_updates {
+	my $sock = IO::Socket::INET->new(Listen    => 5,
+		LocalAddr => $listenaddress, LocalPort => $listenport,
+		Proto     => 'tcp', ReuseAddr => 1,
+		MultiHomed => 1) || die "Could not open listening socket: $!\n";
+	$SIG{'CHLD'} = 'IGNORE';
+	while ( my $client = $sock->accept() ) {
+		my $p = fork();
+		if ( $p != 0 ) {
+			next;
+		}
+		$SIG{'CHLD'} = 'DEFAULT';
+		my @headers;
+		my %cgi;
+		while ( <$client> ) {
+			s/(\r|\n)//g;
+			last if $_ eq "";
+			push @headers, $_;
+		}
+		foreach my $header (@headers) {
+			if ( $header =~ /^GET \/nic\/update\?([^\s].+) HTTP\/1\.[01]$/ ) {
+				foreach my $element (split('&', $1)) {
+					$cgi{(split '=', $element)[0]} = (split '=', $element)[1];
+				}
+			} elsif ( $header =~ /^Authorization: basic (.+)$/ ) {
+				unless ( defined $cgi{'hostname'} ) {
+					print_http_response($client, undef, "badsys");
+					exit(1);
+				}
+				if ( !exists $cgi{'myip'} ) {
+					$cgi{'myip'} = $client->peerhost();
+				}
+				my ($user,$pass) = split ":", MIME::Base64::decode($1);
+				if ( authorize($user, $pass, $cgi{'hostname'}, $cgi{'myip'}) == 0 ) {
+					print_http_response($client, $cgi{'myip'}, "good");
+					update_dns(\%cgi);
+				} else {
+					print_http_response($client, undef, "badauth");
+					exit(1);
+				}
+				last;
+			}
+		}
+		exit(0);
+	}
+	return(0);
+}
+
+sub add_acct {
+	my ($user, $pass, $hostname) = @_;
+	my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+	$X->put($user, join("\t", ($pass, $hostname)));
+	undef $X;
+	untie %h;
+}
+
+sub del_acct {
+        my ($user, $pass, $hostname) = @_;
+        my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+        $X->del($user);
+        undef $X;
+        untie %h;
+}
+
+
+sub authorize {
+	my $user = shift;
+	my $pass = shift;
+	my $hostname = shift;
+	my $ip = shift;;
+	my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+	my ($spass, $shost) = split("\t", $h{$user});
+	if ( defined $h{$user} and ($spass eq $pass) and ($shost eq $hostname) ) {
+		$X->put($user, join("\t", $spass, $shost, $ip));
+		undef $X;
+		untie %h;
+		return(0);
+	}
+	undef $X;
+	untie %h;
+	return(1);
+}
+
+sub print_http_response {
+	my $sock = shift;
+	my $ip = shift;
+	my $response = shift;
+	print $sock "HTTP/1.0 200 OK\n";
+	my @tmp = split /\s+/, scalar gmtime();
+	print $sock "Date: $tmp[0], $tmp[2] $tmp[1] $tmp[4] $tmp[3] GMT\n";
+	print $sock "Server: Peter's Fake DynDNS.org Server/1.0\n";
+	print $sock "Content-Type: text/plain; charset=ISO-8859-1\n";
+	print $sock "Connection: close\n";
+	print $sock "Transfer-Encoding: chunked\n";
+	print $sock "\n";
+	#print $sock "12\n"; # this was part of the dyndns response but i'm not sure what it is
+	print $sock "$response", defined($ip)? " $ip" : "" . "\n";
+}
+
+sub update_dns {
+	my $hashref = shift;
+	my @records;
+	my $found = 0;
+	# update the addn-hosts file
+	open(FILE, "+<$recordfile") || die "Couldn't open recordfile \"$recordfile\": $!\n";
+	flock(FILE, 2);
+	while ( <FILE> ) {
+		if ( /^(\d+\.\d+\.\d+\.\d+)\s+$$hashref{'hostname'}\n$/si ) {
+			if ( $1 ne $$hashref{'myip'} ) {
+				push @records, "$$hashref{'myip'}\t$$hashref{'hostname'}\n";
+				$found = 1;
+			}
+		} else {
+			push @records, $_;
+		}
+	}
+	unless ( $found ) {
+		push @records, "$$hashref{'myip'}\t$$hashref{'hostname'}\n";
+	}
+	sysseek(FILE, 0, 0);
+	truncate(FILE, 0);
+	syswrite(FILE, join("", @records));
+	flock(FILE, 8);
+	close(FILE);
+	dnsmasq_rescan_configs();
+	return(0);
+}
+
+sub dnsmasq_rescan_configs {
+	# send the HUP signal to dnsmasq
+	if ( -r $dnsmasqpidfile ) {
+		open(PID,"<$dnsmasqpidfile") || die "Could not open PID file \"$dnsmasqpidfile\": $!\n";
+		my $pid = <PID>;
+		close(PID);
+		chomp $pid;
+		if ( kill(0, $pid) ) {
+			kill(1, $pid);
+		} else {
+			goto LOOKFORDNSMASQ;
+		}
+	} else {
+		LOOKFORDNSMASQ:
+		opendir(DIR,"/proc") || die "Couldn't opendir /proc: $!\n";
+		my @dirs = grep(/^\d+$/, readdir(DIR));
+		closedir(DIR);
+		foreach my $process (@dirs) {
+			if ( open(FILE,"</proc/$process/cmdline") ) {
+				my $cmdline = <FILE>;
+				close(FILE);
+				if ( (split(/\0/,$cmdline))[0] =~ /dnsmasq/ ) {
+					kill(1, $process);
+				}
+			}
+		}
+	}
+	return(0);
+}

dnsmasq-mdk.spec

@@ -1,130 +0,0 @@
-###############################################################################
-#
-# General mumbojumbo
-#
-###############################################################################
-
-Name: dnsmasq
-Version: 2.3
-Release: 1
-Copyright: GPL
-Group: System Environment/Daemons
-Vendor: Simon Kelley
-Packager: Simon Kelley
-Distribution: Mandrake Linux
-URL: http://www.thekelleys.org.uk/dnsmasq
-Source0: %{name}-%{version}.tar.gz
-Requires: chkconfig
-BuildRoot: /var/tmp/%{name}-%{version}
-Summary: A lightweight caching nameserver
-
-%description
-Dnsmasq is lightweight, easy to configure DNS forwarder and DHCP server. It 
-is designed to provide DNS and, optionally, DHCP, to a small network. It can
-serve the names of local machines which are not in the global DNS. The DHCP 
-server integrates with the DNS server and allows machines with DHCP-allocated
-addresses to appear in the DNS with names configured either in each host or 
-in a central configuration file. Dnsmasq supports static and dynamic DHCP 
-leases and BOOTP for network booting of diskless machines.
-
-
-###############################################################################
-#
-# Build
-#
-###############################################################################
-
-%prep
-%setup -q
-%build
-make
-
-
-###############################################################################
-#
-# Install
-#
-###############################################################################
-
-%install
-rm -rf $RPM_BUILD_ROOT
-
-mkdir -p -m 755 $RPM_BUILD_ROOT/usr/sbin
-mkdir -p -m 755 $RPM_BUILD_ROOT/etc/rc.d/init.d
-mkdir -p -m 755 $RPM_BUILD_ROOT/usr/share/man/man8
-
-cp rpm/dnsmasq.rh $RPM_BUILD_ROOT/etc/rc.d/init.d/dnsmasq
-strip src/dnsmasq
-cp src/dnsmasq $RPM_BUILD_ROOT/usr/sbin
-cp dnsmasq.8 $RPM_BUILD_ROOT/usr/share/man/man8
-cp dnsmasq.conf.example $RPM_BUILD_ROOT/etc/dnsmasq.conf
-###############################################################################
-#
-# Clean up
-#
-###############################################################################
-
-%clean
-rm -rf $RPM_BUILD_ROOT
-
-
-###############################################################################
-#
-# Post-install scriptlet
-#
-###############################################################################
-
-%post
-/sbin/chkconfig --add dnsmasq
-
-
-###############################################################################
-#
-# Pre-uninstall scriptlet
-#
-# If there's a time when your package needs to have one last look around before
-# the user erases it, the place to do it is in the %preun script. Anything that
-# a package needs to do immediately prior to RPM taking any action to erase the
-# package, can be done here.
-#
-###############################################################################
-
-%preun
-if [ $1 = 0 ]; then     # execute this only if we are NOT doing an upgrade
-    service dnsmasq stop >/dev/null 2>&1
-    /sbin/chkconfig --del dnsmasq
-fi
-
-
-###############################################################################
-#
-# Post-uninstall scriptlet
-#
-# The %postun script executes after the package has been removed. It is the
-# last chance for a package to clean up after itself.
-#
-###############################################################################
-
-%postun
-if [ "$1" -ge "1" ]; then
-    service dnsmasq restart >/dev/null 2>&1
-fi
-
-
-###############################################################################
-#
-# File list
-#
-###############################################################################
-
-%files
-%defattr(-,root,root)
-%doc CHANGELOG COPYING FAQ doc.html setup.html UPGRADING_to_2.0
-%attr(0755,root,root) /etc/rc.d/init.d/dnsmasq
-%attr(0664,root,root) /etc/dnsmasq.conf
-%config /etc/rc.d/init.d/dnsmasq
-%config /etc/dnsmasq.conf
-%attr(0755,root,root) /usr/sbin/dnsmasq
-%attr(0644,root,root) /usr/share/man/man8/dnsmasq.8.bz2
-
-

dnsmasq-rh.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.3
+Version: 2.17
 Release: 1
 Copyright: GPL
 Group: System Environment/Daemons
@@ -58,7 +58,6 @@ cp rpm/dnsmasq.rh $RPM_BUILD_ROOT/etc/rc.d/init.d/dnsmasq
 strip src/dnsmasq
 cp src/dnsmasq $RPM_BUILD_ROOT/usr/sbin
 cp dnsmasq.8 $RPM_BUILD_ROOT/usr/share/man/man8
-gzip $RPM_BUILD_ROOT/usr/share/man/man8/dnsmasq.8
 cp dnsmasq.conf.example $RPM_BUILD_ROOT/etc/dnsmasq.conf
 
 ###############################################################################
@@ -128,6 +127,6 @@ fi
 %attr(0755,root,root) /etc/rc.d/init.d/dnsmasq
 %attr(0664,root,root) /etc/dnsmasq.conf
 %attr(0755,root,root) /usr/sbin/dnsmasq
-%attr(0644,root,root) /usr/share/man/man8/dnsmasq.8.gz
+%attr(0644,root,root) /usr/share/man/man8/dnsmasq*
 
 

dnsmasq-suse.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.3
+Version: 2.17
 Release: 1
 Copyright: GPL
 Group: Productivity/Networking/DNS/Servers
@@ -16,7 +16,7 @@ Provides: dns_daemon
 Conflicts: bind bind8 bind9
 PreReq: %fillup_prereq %insserv_prereq
 Autoreqprov: on
-Source0: %{name}-%{version}.tar.gz
+Source0: %{name}-%{version}.tar.bz2
 BuildRoot: /var/tmp/%{name}-%{version}
 Summary: A lightweight caching nameserver
 
@@ -39,6 +39,8 @@ leases and BOOTP for network booting of diskless machines.
 
 %prep
 %setup -q
+patch -p0 <rpm/%{name}-SuSE.patch
+
 %build
 %{?suse_update_config:%{suse_update_config -f}}
 make
@@ -101,6 +103,7 @@ rm -rf $RPM_BUILD_ROOT
 %files
 %defattr(-,root,root)
 %doc CHANGELOG COPYING FAQ doc.html setup.html UPGRADING_to_2.0 rpm/README.susefirewall
+%doc contrib
 %config /etc/init.d/dnsmasq
 %config /etc/dnsmasq.conf
 /usr/sbin/rcdnsmasq

dnsmasq.8

@@ -15,23 +15,27 @@ contents of /etc/hosts so that local hostnames
 which do not appear in the global DNS can be resolved and also answers
 DNS queries for DHCP configured hosts.
 .PP
-.BR dnsmasq 
-supports IPv6.
+The dnsmasq DHCP server supports static address assignments, multiple
+networks, DHCP-relay and RFC3011 subnet specifiers. It automatically
+sends a sensible default set of DHCP options, and can be configured to
+send any desired set of DHCP options. It also supports BOOTP.
 .PP
-.BR dnsmasq
-is lightweight and easy to configure. It is intended as be run on
-small router/firewalls and  provide a DNS (and optionally, DHCP) service to a LAN.
+Dnsmasq 
+supports IPv6.
 .SH OPTIONS
 Note that in general missing parameters are allowed and switch off
-functions, for instance "--pid-file=" disables writing a PID file.
+functions, for instance "--pid-file=" disables writing a PID file. On
+BSD, unless the GNU getopt library is linked, the long form of the
+options does not work on the command line; it is still recognised in
+the configuration file.
 .TP
 .B \-h, --no-hosts
 Don't read the hostnames in /etc/hosts.
 .TP
 .B \-H, --addn-hosts=<file>
 Additional hosts file. Read the specified file as well as /etc/hosts. If -h is given, read
-only the specified file. At most one additional hosts file may be
-given.
+only the specified file. This option may be repeated for more than one
+additional hosts file.
 .TP
 .B \-T, --local-ttl=<time>
 When replying with information from /etc/hosts or the DHCP leases
@@ -42,10 +46,15 @@ time-to-live (in seconds) to be given for these replies. This will
 reduce the load on the server at the expense of clients using stale
 data under some circumstances.
 .TP
+.B \-k, --keep-in-foreground
+Do not go into the background at startup but otherwise run as
+normal. This is intended for use when dnsmasq is run under daemontools.
+.TP
 .B \-d, --no-daemon
 Debug mode: don't fork to the background, don't write a pid file,
 don't change user id, generate a complete cache dump on receipt on
-SIGUSR1, log to stderr as well as syslog.
+SIGUSR1, log to stderr as well as syslog, don't fork new processes
+to handle TCP queries.
 .TP
 .B \-q, --log-queries
 Log the results of DNS queries handled by dnsmasq. Enable a full cache dump on receipt of SIGUSR1.
@@ -70,36 +79,62 @@ Print the version number.
 Listen on <port> instead of the standard DNS port (53). Useful mainly for
 debugging.
 .TP
+.B \-P, --edns-packet-max=<size>
+Specify the largest EDNS.0 UDP packet which is supported by the DNS
+forwarder. Defaults to 1280, which is the RFC2671-recommended maximum
+for ethernet.
+.TP
 .B \-Q, --query-port=<query_port>
 Send outbound DNS queries from, and listen for their replies on, the specific UDP port <query_port> instead of using one chosen at runtime.  Useful to simplify your
 firewall rules; without this, your firewall would have to allow connections from outside DNS servers to a range of UDP ports, or dynamically adapt to the
 port being used by the current dnsmasq instance.
 .TP
 .B \-i, --interface=<interface name>
-Listen only on the specified interface. More than one interface may be specified. Dnsmasq always listens on the loopback (local) interface. If no
-.B \-i
-flags are given, dnsmasq listens on all available interfaces unless overridden by 
-.B \-a
+Listen only on the specified interface(s). Dnsmasq automatically adds
+the loopback (local) interface to the list of interfaces to use when
+the
+.B \--interface
+option  is used. If no
+.B \--interface
 or
-.B \-I
-flags.
+.B \--listen-address
+options are given dnsmasq listens on all available interfaces except any
+given in
+.B \--except-interface
+options. If IP alias interfaces (eg "eth1:0") are used with
+.B --interface
+or
+.B --except-interface
+options, then the 
+.B --bind-interfaces 
+option will be automatically set. This is required for deeply boring
+sockets-API reasons. 
 .TP
 .B \-I, --except-interface=<interface name>
-Do not listen on the specified interface.
+Do not listen on the specified interface. Note that the order of
+.B \--listen-address
+.B --interface
+and
+.B --except-interface
+options does not matter and that 
+.B --except-interface
+options always override the others.
 .TP 
 .B \-a, --listen-address=<ipaddr>
-Listen only on the given IP address. As with 
-.B \-i
-more than one address may be specified. Unlike 
-.B \-i
-the loopback interface is not special: if dnsmasq is to listen on the loopback interface, 
-it's IP, 127.0.0.1, must be explicitly given. If no 
-.B \-a
-flags are given, dnsmasq listens on all available interfaces unless overridden by 
-.B \-i
-or
-.B \-I
-flags.
+Listen on the given IP address(es). Both 
+.B \--interface
+and
+.B \--listen-address
+options may be given, in which case the set of both interfaces and
+addresses is used. Note that if no
+.B \--interface
+option is given, but 
+.B \--listen-address
+is, dnsmasq will not automatically listen on the loopback
+interface. To achieve this, its IP address, 127.0.0.1, must be
+explicitly given as a 
+.B \--listen-address
+option.
 .TP
 .B \-z, --bind-interfaces
 On systems which support it, dnsmasq binds the wildcard address,
@@ -108,12 +143,25 @@ requests that it shouldn't reply to. This has the advantage of
 working even when interfaces come and go and change address. This
 option forces dnsmasq to really bind only the interfaces it is
 listening on. About the only time when this is useful is when 
-running another nameserver on the same machine.
+running another nameserver on the same machine or using IP
+alias. Specifying interfaces with IP alias automatically turns this
+option on. Note that this only applies to the DNS part of dnsmasq, the
+DHCP server always binds the wildcard address in order to receive
+broadcast packets.
 .TP
 .B \-b, --bogus-priv
 Bogus private reverse lookups. All reverse lookups for private IP ranges (ie 192.168.x.x, etc)
-which are not found in /etc/hosts or the DHCP leases file are resolved to the IP address in dotted-quad form.
+which are not found in /etc/hosts or the DHCP leases file are answered
+with "no such domain" rather than being forwarded upstream.
 .TP
+.B \-V, --alias=<old-ip>,<new-ip>[,<mask>]
+Modify IPv4 addresses returned from upstream nameservers; old-ip is
+replaced by new-ip. If the optional mask is given then any address
+which matches the masked old-ip will be re-written. So, for instance
+.B --alias=1.2.3.0,6.7.8.0,255.255.255.0 
+will map 1.2.3.56 to 6.7.8.56 and 1.2.3.67 to 6.7.8.67. This is what
+Cisco PIX routers call "DNS doctoring".
+.TP 
 .B \-B, --bogus-nxdomain=<ipaddr>
 Transform replies which contain the IP address given into "No such
 domain" replies. This is intended to counteract a devious move made by
@@ -203,10 +251,17 @@ with the specified IP address which may be IPv4 or IPv6. To give
 both IPv4 and IPv6 addresses for a domain, use repeated -A flags.
 Note that /etc/hosts and DHCP leases override this for individual
 names. A common use of this is to redirect the entire doubleclick.net
-domain to some friendly local web server to avoid banner ads.
+domain to some friendly local web server to avoid banner ads. The
+domain specification works in the same was as for --server, with the
+additional facility that /#/ matches any domain. Thus
+--address=/#/1.2.3.4 will always return 1.2.3.4 for any query not
+answered from /etc/hosts or DHCP and not sent to an upstream
+nameserver by a more specific --server directive.
 .TP
-.B \-m, --mx-host=<mx name>
-Return an MX record named <mx name> pointing to the host specified in the --mx-target switch
+.B \-m, --mx-host=<mx name>[,<hostname>]
+Return an MX record named <mx name> pointing to the given hostname (if
+given), or
+the host specified in the --mx-target switch
 or, if that switch is not given, the host on which dnsmasq 
 is running. This is useful for directing mail from systems on a LAN
 to a central server.
@@ -254,9 +309,16 @@ given using the
 .B interface
 option. This limitation currently affects OpenBSD. The optional
 network-id is a alphanumeric label which marks this network so that
-dhcp options may be specified on a per-network basis.
+dhcp options may be specified on a per-network basis. The end address
+may be replaced by the keyword 
+.B static
+which tells dnsmasq to enable DHCP for the network specified, but not
+to dynamically allocate IP addresses. Only hosts which have static
+addresses given via 
+.B dhcp-host
+or from /etc/ethers will be served.
 .TP
-.B \-G, --dhcp-host=[[<hwaddr>]|[id:<client_id>]][,<ipaddr>][,<hostname>][,<lease_time>]
+.B \-G, --dhcp-host=[[<hwaddr>]|[id:[<client_id>][*]]][net:<netid>][,<ipaddr>][,<hostname>][,<lease_time>][,ignore]
 Specify per host parameters for the DHCP server. This allows a machine
 with a particular hardware address to be always allocated the same
 hostname, IP address and lease time. A hostname specified like this
@@ -278,11 +340,23 @@ hardware addresses to identify hosts by prefixing with 'id:'. Thus:
 .B --dhcp-host=id:01:02:03:04,..... 
 refers to the host with client identifier 01:02:03:04. It is also
 allowed to specify the client ID as text, like this:
-.B --dhcp-host=id:clientidastext,.....
+.B --dhcp-host=id:clientidastext,..... 
+The special option id:* means "ignore any client-id 
+and use MAC addresses only." This is useful when a client presents a client-id sometimes 
+but not others.
 If a name appears in /etc/hosts, the associated address can be
 allocated to a DHCP lease, but only if a 
 .B --dhcp-host
-option specifying the name also exists.
+option specifying the name also exists. The special keyword "ignore"
+tells dnsmasq to never offer a DHCP lease to a machine. The machine
+can be specified by hardware address, client ID or hostname, for
+instance
+.B --dhcp-host=00:20:e0:3b:13:af,ignore
+This is
+useful when there is another DHCP server on the network which should
+be used by some machines. The net:<network-id> parameter enables DHCP options just
+for this host in the same way as the the network-id in
+.B dhcp-range.
 .TP 
 .B \-Z, --read-ethers
 Read /etc/ethers for information about hosts for the DHCP server. The
@@ -292,7 +366,7 @@ have exactly the same effect as
 .B --dhcp-host
 options containing the same information.
 .TP
-.B \-O, --dhcp-option=[network-id,]<opt>,[<value>[,<value>]]
+.B \-O, --dhcp-option=[<network-id>,[<network-id>,]]<opt>,[<value>[,<value>]]
 Specfify different or extra options to DHCP clients. By default,
 dnsmasq sends some standard options to DHCP clients, the netmask and
 broadcast address are set to the same as the host running dnsmasq, and
@@ -304,21 +378,49 @@ specfied in RFC2132. For example, to set the default route option to
 192.168.4.4, do 
 .B --dhcp-option=3,192.168.4.4
 and to set the time-server address to 192.168.0.4, do
-.B dhcp-option=42,192.168.0.4
+.B --dhcp-option=42,192.168.0.4
 The special address 0.0.0.0 is taken to mean "the address of the
-machine running dnsmasq". If the optional network-id is given then
-this option is only sent to machines on the network whose dhcp-range
-contains a matching network-id.
+machine running dnsmasq". Data types allowed are comma seperated
+dotted-quad IP addresses, a decimal number, colon-seperated hex digits
+and a text string. If the optional network-ids are given then
+this option is only sent when all the network-ids are matched.
 Be careful: no checking is done that the correct type of data for the
-option number is sent, and there are option numbers for which it is not
-possible to generate the correct data type; it is quite possible to
+option number is sent, it is quite possible to
 persuade dnsmasq to generate illegal DHCP packets with injudicious use
 of this flag.
 .TP
-.B \-M, --dhcp-boot=<filename>,[<servername>[,<server address>]]
+.B \-U, --dhcp-vendorclass=<network-id>,<vendor-class>
+Map from a vendor-class string to a network id. Most DHCP clients provide a 
+"vendor class" which represents, in some sense, the type of host. This option 
+maps vendor classes to network ids, so that DHCP options may be selectively delivered
+to different classes of hosts. For example 
+.B dhcp-vendorclass=printers,Hewlett-Packard JetDirect
+will allow options to be set only for HP printers like so:
+.B --dhcp-option=printers,3,192.168.4.4 
+The vendor-class string is
+substring matched against the vendor-class supplied by the client, to
+allow fuzzy matching.
+.TP
+.B \-j, --dhcp-userclass=<network-id>,<user-class>
+Map from a user-class string to a network id (with substring
+matching, like vendor classes). Most DHCP clients provide a 
+"user class" which is configurable. This option
+maps user classes to network ids, so that DHCP options may be selectively delivered
+to different classes of hosts. It is possible, for instance to use
+this to set a different printer server for hosts in the class
+"accounts" than for hosts in the class "engineering".
+.TP
+.B \ -J, --dhcp-ignore=<network-id>[,<network-id>]
+When all the given network-ids match the set of network-ids derived
+from the net, host, vendor and user classes, ignore the host and do
+not allocate it a DHCP lease.
+.TP
+.B \-M, --dhcp-boot=[net:<network-id>,]<filename>,[<servername>[,<server address>]]
 Set BOOTP options to be returned by the DHCP server. These are needed
 for machines which network boot, and tell the machine where to collect
-its initial configuration.
+its initial configuration. If the optional network-id(s) are given,
+they must match for this configuration to be sent. Note that
+network-ids are prefixed by "net:" to distinguish them.
 .TP  
 .B \-X, --dhcp-lease-max=<number>
 Limits dnsmasq to the specified maximum number of DHCP leases. The
@@ -326,8 +428,19 @@ default is 150. This limit is to prevent DoS attacks from hosts which
 create thousands of leases and use lots of memory in the dnsmasq
 process.
 .TP
+.B \-K, --dhcp-authoritative
+Should be set when dnsmasq is definatively the only DHCP server on a network.
+It changes the behaviour from strict RFC compliance so that DHCP requests on
+unknown leases from unknown hosts are not ignored. This allows new hosts
+to get a lease without a tedious timeout under all circumstances.
+.TP
 .B \-l, --dhcp-leasefile=<path>
-Use the specified file to store DHCP lease information.
+Use the specified file to store DHCP lease information. If this option
+is given but no dhcp-range option is given then dnsmasq version 1
+behaviour is activated. The file given is assumed to be an ISC dhcpd
+lease file and parsed for leases which are then added to the DNS
+system if they have a hostname. This functionality may have been
+excluded from dnsmasq at compile time, in which case an error will occur.
 .TP
 .B \-s, --domain=<domain>
 Specifies the domain for the DHCP server. This has two effects;
@@ -337,26 +450,38 @@ for DHCP-configured hosts to claim. The intention is to constrain hostnames so t
 .B --domain-suffix=thekelleys.org.uk
 and have a machine whose DHCP hostname is "laptop". The IP address for that machine is available from 
 .B dnsmasq
-both as "laptop" and "laptop.thekelleys.org.uk".
+both as "laptop" and "laptop.thekelleys.org.uk". If the domain is
+given as "#" then the domain is read from the first "search" directive
+in /etc/resolv.conf (or equivalent). 
 .TP
 .B \-E, --expand-hosts
 Add the domain-suffix to simple names (without a period) in /etc/hosts
 in the same way as for DHCP-derived names.
 .SH CONFIG FILE
-At startup, dnsmasq reads /etc/dnsmasq.conf, if it exists. (On
-FreeBSD, the file is /usr/local/etc/dnsmasq.conf) The format of this
+At startup, dnsmasq reads
+.I /etc/dnsmasq.conf,
+if it exists. (On
+FreeBSD, the file is 
+.I /usr/local/etc/dnsmasq.conf
+) The format of this
 file consists of one option per line, exactly as the long options detailed 
 in the OPTIONS section but without the leading "--". Lines starting with # are comments and ignored. For
 options which may only be specified once, the configuration file overrides 
 the command line. Use the --conf-file option to specify a different
-configuration file.
+configuration file. The conf-file option is also allowed in
+configuration files, to include multiple configuration files. Only one
+level of nesting is allowed.
 .SH NOTES
 When it receives a SIGHUP, 
 .B dnsmasq 
-clears its cache and then re-loads /etc/hosts. If 
+clears its cache and then re-loads 
+.I /etc/hosts.
+If 
 .B
 --no-poll
-is set SIGHUP also re-reads /etc/resolv.conf. SIGHUP
+is set SIGHUP also re-reads
+.I /etc/resolv.conf.
+SIGHUP
 does NOT re-read the configuration file.
 .PP
 When it receives a SIGUSR1,
@@ -372,25 +497,34 @@ Dnsmasq is a DNS query forwarder: it it not capable of recursively
 answering arbitrary queries starting from the root servers but
 forwards such queries to a fully recursive upstream DNS server which is
 typically provided by an ISP. By default, dnsmasq reads
-/etc/resolv.conf to discover the IP
+.I /etc/resolv.conf
+to discover the IP
 addresses of the upstream nameservers it should use, since the
 information is typically stored there. Unless
 .B --no-poll
 is used,
 .B dnsmasq
-checks the modification time of /etc/resolv.conf (or 
-equivalent if 
+checks the modification time of
+.I /etc/resolv.conf
+(or equivalent if 
 .B \--resolv-file 
 is used) and re-reads it if it changes. This allows the DNS servers to
 be set dynamically by PPP or DHCP since both protocols provide the
 information.
-Absence of /etc/resolv.conf is not an error
+Absence of
+.I /etc/resolv.conf
+is not an error
 since it may not have been created before a PPP connection exists. Dnsmasq 
-simply keeps checking in case /etc/resolv.conf is created at any
+simply keeps checking in case
+.I /etc/resolv.conf 
+is created at any
 time. Dnsmasq can be told to parse more than one resolv.conf
 file. This is useful on a laptop, where both PPP and DHCP may be used:
-dnsmasq can be set to poll both /etc/ppp/resolv.conf and
-/etc/dhcpc/resolv.conf and will use the contents of whichever changed
+dnsmasq can be set to poll both 
+.I /etc/ppp/resolv.conf 
+and
+.I /etc/dhcpc/resolv.conf 
+and will use the contents of whichever changed
 last, giving automatic switching between DNS servers.
 .PP
 Upstream servers may also be specified on the command line or in
@@ -410,6 +544,37 @@ and run dnsmasq with the
 .B \-r /etc/resolv.dnsmasq
 option. This second technique allows for dynamic update of the server
 addresses by PPP or DHCP.
+.PP
+The network-id system works as follows: For each DHCP request, dnsmasq
+collects a set of valid network-id tags, one from the 
+.B dhcp-range
+used to allocate the address, one from any matching 
+.B dhcp-host
+and possibly many from matching vendor classes and user
+classes sent by the DHCP client. Any 
+.B dhcp-option 
+which has network-id tags will be used in preference  to an untagged 
+.B dhcp-option,
+provided that _all_ the tags match somewhere in the
+set collected as described above. The prefix '#' on a tag means 'not'
+so --dhcp=option=#purple,3,1.2.3.4 sends the option when the
+network-id tag purple is not in the set of valid tags.
+.PP
+The DHCP server in dnsmasq will function as a BOOTP server also,
+provided that the MAC address and IP address for clients are given,
+either using 
+.B dhcp-host 
+configurations or in
+.I /etc/ethers
+, and a
+.B dhcp-range 
+configuration option is present to activate the DHCP server
+on a particular network. The filename
+parameter in a BOOTP request is matched against netids in
+.B  dhcp-option 
+configurations, allowing some control over the options returned to
+different classes of hosts.
+
 .SH FILES
 .IR /etc/dnsmasq.conf 
 
@@ -419,6 +584,8 @@ addresses by PPP or DHCP.
 
 .IR /etc/hosts
 
+.IR /etc/ethers
+
 .IR /var/lib/misc/dnsmasq.leases 
 
 .IR /var/db/dnsmasq.leases

dnsmasq.conf.example

@@ -12,7 +12,7 @@
 #selfmx
 #localmx
 
-# The following three options make you a better netizen, since they 
+# The following two options make you a better netizen, since they 
 # tell dnsmasq to filter out queries which the public DNS cannot
 # answer, and which load the servers (especially the root servers) 
 # uneccessarily. If you have a dial-on-demand link they also stop
@@ -20,13 +20,16 @@
 
 # Never forward plain names (with a dot or domain part)
 domain-needed
-# Reply to reverse queries for addresses in the non-routed address
-# space with the dotted.quad address
+# Never forward addresses in the non-routed address spaces.
 bogus-priv
-# Filter useless windows-originated DNS requests
-filterwin2k
 
 
+# Uncomment this to filter useless windows-originated DNS requests
+# which can trigger dial-on-demand links needlessly.
+# Note that (amongst other things) this blocks all SRV requests, 
+# so don't use it if you use eg Kerberos.
+#filterwin2k
+
 # Change this line if you want dns to get its upstream servers from
 # somewhere other that /etc/resolv.conf 
 #resolv-file=
@@ -157,6 +160,28 @@ filterwin2k
 # it asks for a DHCP lease.
 #dhcp-host=judge
 
+# Never offer DHCP service to a machine whose ethernet 
+# address is 11:22:33:44:55:66
+#dhcp-host=11:22:33:44:55:66,ignore
+
+# Ignore any client-id presented by the machine with ethernet
+# address 11:22:33:44:55:66. This is useful to prevent a machine 
+# being treated differently when running under different OS's or
+# between PXE boot and OS boot.
+#dhcp-host=11:22:33:44:55:66,id:*
+
+# Send extra options which are tagged as "red" to 
+# the machine with ethernet address 11:22:33:44:55:66
+#dhcp-host=11:22:33:44:55:66,net:red
+
+# Send extra options which are tagged as "red" to any machine whose
+# DHCP vendorclass string includes the substring "Linux"
+#dhcp-vendorclass=red,Linux
+
+# Send extra options which are tagged as "red" to any machine one 
+# of whose DHCP userclass strings includes the substring "accounts"
+#dhcp-userclass=red,accounts
+
 # If this line is uncommented, dnsmasq will read /etc/ethers and act
 # on the ethernet-address/IP pairs found there just as if they had
 # been given as --dhcp-host options. Useful if you keep
@@ -193,6 +218,10 @@ filterwin2k
 # Set the "all subnets are local" flag
 #dhcp-option=27,1
 
+# Send the etherboot magic flag and then etherboot options (a string).
+#dhcp-option=128,e4:45:74:68:00:00
+#dhcp-option=129,NIC=eepro100
+
 # Specify an option which will only be sent to the "red" network 
 # (see dhcp-range for the declaration of the "red" network)
 #dhcp-option=red,42,192.168.1.1
@@ -208,7 +237,10 @@ filterwin2k
 #dhcp-option=45,0.0.0.0     # netbios datagram distribution server
 #dhcp-option=46,8           # netbios node type
 #dhcp-option=47             # empty netbios scope.
- 
+
+# Send RFC-3397 DNS domain search DHCP option. WARNING: Your DHCP client
+# probably doesn't support this......
+#dhcp-option=119,eng.apple.com,marketing.apple.com 
 
 # Set the boot filename and tftpd server name and address
 # for BOOTP. You will only need this is you want to
@@ -223,6 +255,16 @@ filterwin2k
 # the line below.
 #dhcp-leasefile=/var/lib/misc/dnsmasq.leases
 
+# Set the DHCP server to authoritative mode. In this mode it will barge in 
+# and take over the lease for any client which broadcasts on the network, 
+# whether it has a record of the lease or not. This avoids long timeouts
+# when a machine wakes up on a new network. DO NOT enable this if there's 
+# the slighest chance that you might end up accidentally configuring a DHCP
+# server for your campus/company accidentally. The ISC server uses the same
+# the same option, and this URL provides more information:
+# http://www.isc.org/index.pl?/sw/dhcp/authoritative.php
+#dhcp-authoritative
+
 # Set the cachesize here.
 #cache-size=150
 
@@ -243,11 +285,20 @@ filterwin2k
 # registries which have implemented wildcard A records.
 #bogus-nxdomain=64.94.110.11
 
+# If you want to fix up DNS results from upstream servers, use the
+# alias option. This only works for IPv4.
+# This alias makes a result of 1.2.3.4 appear as 5.6.7.8
+#alias=1.2.3.4,5.6.7.8
+# and this maps 1.2.3.x to 5.6.7.x
+#alias=1.2.3.0,5.6.7.0,255.255.255.0
+
 # For debugging purposes, log each DNS query as it passes through
 # dnsmasq.
 #log-queries
 
-
+# Include a another lot of configuration options.
+#conf-file=/etc/dnsmasq.more.conf
+ 
  
 
 

doc.html

@@ -18,9 +18,13 @@ connected to the internet via a modem, cable-modem or ADSL
 connection but would be a good choice for any small network where low
 resource use and ease of configuration are important. 
 <P>
-Dnsmasq is included in at least the following Linux distributions: Gentoo, Debian,
-Smoothwall, IP-Cop, floppyfw, Firebox, Freesco and
-Clarkconnect. It is also available as a FreeBSD port and is used in Linksys wireless routers.
+Supported platforms include Linux (with glibc and uclibc), *BSD and
+Mac OS X.
+Dnsmasq is included in at least the following Linux distributions:
+Gentoo, Debian, Slackware, Suse, 
+Smoothwall, IP-Cop, floppyfw, Firebox, LEAF, Freesco, CoyoteLinux and
+Clarkconnect. It is also available as a FreeBSD port and is used in
+Linksys wireless routers and the m0n0wall project.
 <P>
 Dnsmasq provides the following features:
 <DIR>
@@ -38,22 +42,18 @@ machine: If the names of local machines are there, then they can all
 be addressed without having to maintain /etc/hosts on each machine.
 </LI>
 <LI>
-Dnsmasq will serve names from the DHCP leases file on the firewall machine:
-If machines specify a hostname when they take out a DHCP lease, then they are
-addressable in the local DNS. <B>UPDATE</B> Dnsmasq version 2 now offers an integrated DHCP server
-instead of the lease file reader. This gives better control of the
-interaction with new functions (for example fixed IP leasess and
-attaching names to ethernet addresses centrally) it's also much
-smaller than dnsmasq and ISC dhcpd which is important for router distros.
+The integrated DHCP server supports static and dynamic DHCP leases and
+multiple networks and IP ranges. It works across BOOTP relays and
+supports DHCP options including RFC3397 DNS search lists.
+Machines which are configured by DHCP have their names automatically 
+included in the DNS and the names can specified by each machine or
+centrally by associating a name with a MAC address in the dnsmasq
+config file.
 </LI>
 <LI>
 Dnsmasq caches internet addresses (A records and AAAA records) and address-to-name
 mappings (PTR records), reducing the load on upstream servers and
-improving performance (especially on modem connections). From version
-0.95 the cache honours time-to-live information and removes old
-records as they expire. From version 0.996 dnsmasq does negative
-caching. From version 1.2 dnsmasq supports IPv6 addresses, both
-in its cache and in /etc/hosts.
+improving performance (especially on modem connections). 
 </LI>
 <LI>
 Dnsmasq can be configured to automatically pick up the addresses of
@@ -73,20 +73,14 @@ upstream servers handling only those domains. This makes integration
 with private DNS systems easy.
 </LI>
 <LI>
-Dnsmasq can be configured to return an MX record 
-for the firewall host. This makes it easy to configure the mailer on the local 
-machines to forward all mail to the central mailer on the firewall host. Never 
-lose root messages from your machines again!
-</LI>
-<LI>
-For version 1.15 dnsmasq has a facility to work around Verisign's infamous wildcard A record
-in the .com and .net TLDs
+Dnsmasq supports MX records and can be configured to return MX records
+for any or all local machines.
 </LI>
 </DIR>
 
 <H2>Download.</H2>
 
-Download dnsmasq <A HREF="http://www.thekelleys.org.uk/dnsmasq/"> here</A>. 
+<A HREF="http://www.thekelleys.org.uk/dnsmasq/"> Download</A> dnsmasq here. 
 The tarball includes this documentation, source, manpage and control files for building .rpms.
 There are also pre-built i386 .rpms, and a 
 <A HREF="CHANGELOG"> CHANGELOG</A>.
@@ -109,13 +103,22 @@ bzip2 dnsmasq-zzz.tar
 </PRE>
 
 <H2>Links.</H2>
-Ulrich Ivens has a nice HOWTO in German on installing dnsmasq at <A HREF="http://howto.linux-hardware-shop.de/dnsmasq.html">http://howto.linux-hardware-shop.de/dnsmasq.html</A>
+Ulrich Ivens has a nice HOWTO in German on installing dnsmasq at <A
+HREF="http://howto.linux-hardware-shop.de/dnsmasq.html">http://howto.linux-hardware-shop.de/dnsmasq.html</A>
+and Damien Raude-Morvan has one in French at <A HREF="http://www.drazzib.com/docs-dnsmasq.html">http://www.drazzib.com/docs-dnsmasq.html</A>
+There is a good article about dnsmasq at <A
+HREF="http://www.enterprisenetworkingplanet.com/netos/article.php/3377351">http://www.enterprisenetworkingplanet.com/netos/article.php/3377351</A>
 
 <H2>License.</H2>
 Dnsmasq is distributed under the GPL. See the file COPYING in the distribution 
 for details.
 
 <H2>Contact.</H2>
-Dnsmasq was written by Simon Kelley. You can contact me at <A HREF="mailto:simon@thekelleys.org.uk">simon@thekelleys.org.uk</A>. Bugreports, patches, and suggestions for improvements gratefully accepted.
+There is a dnsmasq mailing list at <A
+HREF="http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss">
+http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss</A> which should be the
+first location for queries, bugreports, suggestions etc.
+Dnsmasq was written by Simon Kelley. You can contact me at <A
+HREF="mailto:simon@thekelleys.org.uk">simon@thekelleys.org.uk</A>.
 </BODY>
 

rpm/dnsmasq-SuSE.patch

@@ -0,0 +1,42 @@
+--- dnsmasq.8	2004-08-08 20:57:56.000000000 +0200
++++ dnsmasq.8	2004-08-12 00:40:01.000000000 +0200
+@@ -69,7 +69,7 @@
+ .TP
+ .B \-g, --group=<groupname> 
+ Specify the group which dnsmasq will run
+-as. The defaults to "dip", if available, to facilitate access to
++as. The defaults to "dialout", if available, to facilitate access to
+ /etc/ppp/resolv.conf which is not normally world readable.
+ .TP
+ .B \-v, --version
+--- dnsmasq.conf.example	2004-08-08 21:18:26.000000000 +0200
++++ dnsmasq.conf.example	2004-08-12 00:40:01.000000000 +0200
+@@ -65,7 +65,7 @@
+ 
+ # You no longer (as of version 1.7) need to set these to enable 
+ # dnsmasq to read /etc/ppp/resolv.conf since dnsmasq now uses the
+-# "dip" group to achieve this.
++# "dialout" group to achieve this.
+ #user=
+ #group=
+ 
+--- src/config.h	2004-08-11 11:39:18.000000000 +0200
++++ src/config.h	2004-08-12 00:40:01.000000000 +0200
+@@ -44,7 +44,7 @@
+ #endif
+ #define DEFLEASE 3600 /* default lease time, 1 hour */
+ #define CHUSER "nobody"
+-#define CHGRP "dip"
++#define CHGRP "dialout"
+ #define IP6INTERFACES "/proc/net/if_inet6"
+ #define UPTIME "/proc/uptime"
+ #define DHCP_SERVER_PORT 67
+@@ -187,7 +187,7 @@
+ 
+ /* platform independent options. */
+ #undef HAVE_BROKEN_RTC
+-#define HAVE_ISC_READER
++#undef HAVE_ISC_READER
+ 
+ #if defined(HAVE_BROKEN_RTC) && defined(HAVE_ISC_READER)
+ #  error HAVE_ISC_READER is not compatible with HAVE_BROKEN_RTC

src/Makefile

@@ -3,8 +3,8 @@
 
 CFLAGS?= -O2
 
-OBJS = cache.o rfc1035.o util.o option.o forward.o \
-       network.o dnsmasq.o dhcp.o lease.o rfc2131.o
+OBJS = cache.o rfc1035.o util.o option.o forward.o isc.o \
+       network.o dnsmasq.o dhcp.o lease.o rfc2131.o 
 
 .c.o: dnsmasq.h config.h 
 	$(CC) $(CFLAGS) $(RPM_OPT_FLAGS) -Wall -W -c $*.c 

src/cache.c

@@ -17,11 +17,12 @@ static struct crec *dhcp_inuse, *dhcp_spare, *new_chain;
 static int cache_inserted, cache_live_freed, insert_error;
 static union bigname *big_free;
 static int bignames_left, log_queries, cache_size, hash_size;
-static char *addn_file;
+static int uid;
 
 static void cache_free(struct crec *crecp);
 static void cache_unlink(struct crec *crecp);
 static void cache_link(struct crec *crecp);
+static char *record_source(struct hostsfile *add_hosts, int index);
 
 void cache_init(int size, int logq)
 {
@@ -35,7 +36,7 @@ void cache_init(int size, int logq)
   cache_size = size;
   big_free = NULL;
   bignames_left = size/10;
-  addn_file = NULL;
+  uid = 0;
 
   cache_inserted = cache_live_freed = 0;
 
@@ -47,6 +48,7 @@ void cache_init(int size, int logq)
 	{
 	  cache_link(crecp);
 	  crecp->flags = 0;
+	  crecp->uid = uid++;
 	}
     }
   
@@ -83,7 +85,8 @@ static void cache_free(struct crec *crecp)
 {
   crecp->flags &= ~F_FORWARD;
   crecp->flags &= ~F_REVERSE;
-
+  crecp->uid = uid++; /* invalidate CNAMES pointing to this. */
+  
   if (cache_tail)
     cache_tail->next = crecp;
   else
@@ -137,6 +140,22 @@ char *cache_get_name(struct crec *crecp)
   return crecp->name.sname;
 }
 
+static int is_outdated_cname_pointer(struct crec *crecp)
+{
+  struct crec *target = crecp->addr.cname.cache;
+
+  if (!(crecp->flags & F_CNAME))
+    return 0;
+
+  if (!target)
+    return 1;
+
+  if (crecp->addr.cname.uid == target->uid)
+    return 0;
+
+  return 1;
+}
+
 static void cache_scan_free(char *name, struct all_addr *addr, time_t now, unsigned short flags)
 {
   /* Scan and remove old entries.
@@ -146,14 +165,15 @@ static void cache_scan_free(char *name, struct all_addr *addr, time_t now, unsig
      entries in the whole cache.
      If (flags == 0) remove any expired entries in the whole cache. */
   
-#define F_CACHESTATUS (F_HOSTS | F_DHCP | F_FORWARD | F_REVERSE | F_IPV4 | F_IPV6)
+#define F_CACHESTATUS (F_HOSTS | F_DHCP | F_FORWARD | F_REVERSE | F_IPV4 | F_IPV6 | F_CNAME)
   struct crec *crecp, **up;
-  flags &= (F_FORWARD | F_REVERSE | F_IPV6 | F_IPV4);
+  flags &= (F_FORWARD | F_REVERSE | F_IPV6 | F_IPV4 | F_CNAME);
 
   if (flags & F_FORWARD)
     {
       for (up = hash_bucket(name), crecp = *up; crecp; crecp = crecp->hash_next)
 	if ((!(crecp->flags & F_IMMORTAL) && difftime(now, crecp->ttd) > 0) ||
+	    is_outdated_cname_pointer(crecp) || 
 	    ((flags == (crecp->flags & F_CACHESTATUS)) && hostname_isequal(cache_get_name(crecp), name)))
 	  {
 	    *up = crecp->hash_next;
@@ -177,7 +197,7 @@ static void cache_scan_free(char *name, struct all_addr *addr, time_t now, unsig
       for (i = 0; i < hash_size; i++)
 	for (crecp = hash_table[i], up = &hash_table[i]; crecp; crecp = crecp->hash_next)
 	  if ((!(crecp->flags & F_IMMORTAL) && difftime(now, crecp->ttd) > 0) ||
-	      ((flags == (crecp->flags & F_CACHESTATUS)) && memcmp(&crecp->addr, addr, addrlen) == 0))
+	      ((flags == (crecp->flags & F_CACHESTATUS)) && memcmp(&crecp->addr.addr, addr, addrlen) == 0))
 	    {
 	      *up = crecp->hash_next;
 	      if (!(crecp->flags & (F_HOSTS | F_DHCP)))
@@ -214,8 +234,8 @@ void cache_start_insert(void)
   insert_error = 0;
 }
  
-void cache_insert(char *name, struct all_addr *addr, 
-		  time_t now,  unsigned long ttl, unsigned short flags)
+struct crec *cache_insert(char *name, struct all_addr *addr, 
+			  time_t now,  unsigned long ttl, unsigned short flags)
 {
 #ifdef HAVE_IPV6
   int addrlen = (flags & F_IPV6) ? IN6ADDRSZ : INADDRSZ;
@@ -226,7 +246,7 @@ void cache_insert(char *name, struct all_addr *addr,
   union bigname *big_name = NULL;
   int freed_all = flags & F_REVERSE;
 
-  log_query(flags | F_UPSTREAM, name, addr);
+  log_query(flags | F_UPSTREAM, name, addr, 0, NULL, 0);
 
   /* name is needed as workspace by log_query in this case */
   if ((flags & F_NEG) && (flags & F_REVERSE))
@@ -237,7 +257,7 @@ void cache_insert(char *name, struct all_addr *addr,
 
   /* if previous insertion failed give up now. */
   if (insert_error)
-    return;
+    return NULL;
 
   /* First remove any expired entries and entries for the name/address we
      are currently inserting. */
@@ -248,7 +268,7 @@ void cache_insert(char *name, struct all_addr *addr,
     if (!(new = cache_tail)) /* no entries left - cache is too small, bail */
       {
 	insert_error = 1;
-	return;
+	return NULL;
       }
     
     /* End of LRU list is still in use: if we didn't scan all the hash
@@ -259,7 +279,7 @@ void cache_insert(char *name, struct all_addr *addr,
       { 
 	if (freed_all)
 	  {
-	    cache_scan_free(cache_get_name(new), &new->addr, now, new->flags);
+	    cache_scan_free(cache_get_name(new), &new->addr.addr, now, new->flags);
 	    cache_live_freed++;
 	  }
 	else
@@ -283,7 +303,7 @@ void cache_insert(char *name, struct all_addr *addr,
 		 !(big_name = (union bigname *)malloc(sizeof(union bigname))))
 	  {
 	    insert_error = 1;
-	    return;
+	    return NULL;
 	  }
 	else
 	  bignames_left--;
@@ -306,10 +326,15 @@ void cache_insert(char *name, struct all_addr *addr,
   else
     *cache_get_name(new) = 0;
   if (addr)
-    memcpy(&new->addr, addr, addrlen);
+    memcpy(&new->addr.addr, addr, addrlen);
+  else
+    new->addr.cname.cache = NULL;
+  
   new->ttd = now + (time_t)ttl;
   new->next = new_chain;
   new_chain = new;
+
+  return new;
 }
 
 /* after end of insertion, commit the new entries */
@@ -321,10 +346,16 @@ void cache_end_insert(void)
   while (new_chain)
     { 
       struct crec *tmp = new_chain->next;
-      cache_hash(new_chain);
-      cache_link(new_chain);
+      /* drop CNAMEs which didn't find a target. */
+      if (is_outdated_cname_pointer(new_chain))
+	cache_free(new_chain);
+      else
+	{
+	  cache_hash(new_chain);
+	  cache_link(new_chain);
+	  cache_inserted++;
+	}
       new_chain = tmp;
-      cache_inserted++;
     }
   new_chain = NULL;
 }
@@ -345,7 +376,8 @@ struct crec *cache_find_by_name(struct crec *crecp, char *name, time_t now, unsi
 	{
 	  next = crecp->hash_next;
 	  
-	  if ((crecp->flags & F_IMMORTAL) || difftime(now, crecp->ttd) < 0)
+	  if (!is_outdated_cname_pointer(crecp) &&
+	      ((crecp->flags & F_IMMORTAL) || difftime(now, crecp->ttd) < 0))
 	    {
 	      if ((crecp->flags & F_FORWARD) && 
 		  (crecp->flags & prot) &&
@@ -430,7 +462,7 @@ struct crec *cache_find_by_addr(struct crec *crecp, struct all_addr *addr,
 	     {      
 	       if ((crecp->flags & F_REVERSE) && 
 		   (crecp->flags & prot) &&
-		   memcmp(&crecp->addr, addr, addrlen) == 0)
+		   memcmp(&crecp->addr.addr, addr, addrlen) == 0)
 		 {	    
 		   if (crecp->flags & (F_HOSTS | F_DHCP))
 		     {
@@ -461,30 +493,34 @@ struct crec *cache_find_by_addr(struct crec *crecp, struct all_addr *addr,
   if (ans && 
       (ans->flags & F_REVERSE) &&
       (ans->flags & prot) &&
-      memcmp(&ans->addr, addr, addrlen) == 0)
+      memcmp(&ans->addr.addr, addr, addrlen) == 0)
     return ans;
   
   return NULL;
 }
 
-static void add_hosts_entry(struct crec *cache, struct all_addr *addr, int addrlen, unsigned short flags)
+static void add_hosts_entry(struct crec *cache, struct all_addr *addr, int addrlen, 
+			    unsigned short flags, int index)
 {
   struct crec *lookup = cache_find_by_name(NULL, cache->name.sname, 0, flags & (F_IPV4 | F_IPV6));
 
   /* Remove duplicates in hosts files. */
-  if (lookup  && (lookup->flags & F_HOSTS) &&
-      memcmp(&lookup->addr, addr, addrlen) == 0)
+  if (lookup && (lookup->flags & F_HOSTS) &&
+      memcmp(&lookup->addr.addr, addr, addrlen) == 0)
     free(cache);
   else
     {
+      /* Ensure there is only one address -> name mapping (first one trumps) */
+      if (cache_find_by_addr(NULL, addr, 0, flags & (F_IPV4 | F_IPV6)))
+	flags &= ~F_REVERSE;
       cache->flags = flags;
-      memcpy(&cache->addr, addr, addrlen);
+      cache->uid = index;
+      memcpy(&cache->addr.addr, addr, addrlen);
       cache_hash(cache);
-
     }
 }
 
-static void read_hostsfile(char *filename, int opts, char *buff, char *domain_suffix, unsigned short addn_flag)
+static void read_hostsfile(char *filename, int opts, char *buff, char *domain_suffix, int index)
 {  
   FILE *f = fopen(filename, "r");
   char *line;
@@ -543,16 +579,12 @@ static void read_hostsfile(char *filename, int opts, char *buff, char *domain_su
 		 strcpy(cache->name.sname, token);
 		 strcat(cache->name.sname, ".");
 		 strcat(cache->name.sname, domain_suffix);
-		 add_hosts_entry(cache, &addr, addrlen, flags | addn_flag);
-		 /* Only first name is cannonical and used for reverse lookups */
-		 flags &=  ~F_REVERSE;
+		 add_hosts_entry(cache, &addr, addrlen, flags, index);
 	       }
 	     if ((cache = malloc(sizeof(struct crec) + strlen(token)+1-SMALLDNAME)))
 	       {
 		 strcpy(cache->name.sname, token);
-		 add_hosts_entry(cache, &addr, addrlen, flags | addn_flag);
-		 /* Clear this here in case not done above. */
-		 flags &=  ~F_REVERSE;
+		 add_hosts_entry(cache, &addr, addrlen, flags, index);
 	       }
 	   }
 	 else
@@ -565,7 +597,7 @@ static void read_hostsfile(char *filename, int opts, char *buff, char *domain_su
   syslog(LOG_INFO, "read %s - %d addresses", filename, count);
 }
 	    
-void cache_reload(int opts, char *buff, char *domain_suffix, char *addn_hosts)
+void cache_reload(int opts, char *buff, char *domain_suffix, struct hostsfile *addn_hosts)
 {
   struct crec *cache, **up, *tmp;
   int i;
@@ -602,11 +634,11 @@ void cache_reload(int opts, char *buff, char *domain_suffix, char *addn_hosts)
 
   if (!(opts & OPT_NO_HOSTS))
     read_hostsfile(HOSTSFILE, opts, buff, domain_suffix, 0);
-  if (addn_hosts)
+  while (addn_hosts)
     {
-      read_hostsfile(addn_hosts, opts, buff, domain_suffix, F_ADDN);
-      addn_file = addn_hosts;
-    }
+      read_hostsfile(addn_hosts->fname, opts, buff, domain_suffix, addn_hosts->index);
+      addn_hosts = addn_hosts->next;
+    }  
 } 
 
 void cache_unhash_dhcp(void)
@@ -632,36 +664,43 @@ void cache_unhash_dhcp(void)
   dhcp_inuse = NULL;
 }
 
-void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd, unsigned short flags) 
+void cache_add_dhcp_entry(struct daemon *daemon, char *host_name, 
+			  struct in_addr *host_address, time_t ttd) 
 {
   struct crec *crec;
-  
-  if ((crec = cache_find_by_name(NULL, host_name, 0, F_IPV4)))
+  unsigned short flags =  F_DHCP | F_FORWARD | F_IPV4 | F_REVERSE;
+
+  if (!host_name)
+    return;
+
+  if ((crec = cache_find_by_name(NULL, host_name, 0, F_IPV4 | F_CNAME)))
     {
       if (crec->flags & F_HOSTS)
 	{
-	  if (crec->addr.addr.addr4.s_addr != host_address->s_addr)
-	    syslog(LOG_WARNING, "Not naming DHCP lease for %s because it clashes with an /etc/hosts entry.", host_name);
+	  if (crec->addr.addr.addr.addr4.s_addr != host_address->s_addr)
+	    {
+	      strcpy(daemon->namebuff, inet_ntoa(crec->addr.addr.addr.addr4));
+	      syslog(LOG_WARNING, 
+		     "not giving name %s to the DHCP lease of %s because "
+		     "the name exists in %s with address %s", 
+		     host_name, inet_ntoa(*host_address),
+		     record_source(daemon->addn_hosts, crec->uid), daemon->namebuff);
+	    }
+	  return;
 	}
       else if (!(crec->flags & F_DHCP))
-	{
-	  if (crec->flags & F_NEG)
-	    {
-	      /* name may have been searched for before being allocated to DHCP and 
-		 therefore got a negative cache entry. If so delete it and continue. */
-	      cache_scan_free(host_name, NULL, 0, F_IPV4 | F_FORWARD);
-	      goto newrec;
-	    }
-	  else
-	    syslog(LOG_WARNING, "Not naming DHCP lease for %s because it clashes with a cached name.", cache_get_name(crec));
-	}
-      return;
+	cache_scan_free(host_name, NULL, 0, crec->flags & (F_IPV4 | F_CNAME | F_FORWARD));
     }
  
-  if ((crec = cache_find_by_addr(NULL, (struct all_addr *)host_address, 0, F_IPV4)) && (crec->flags & F_NEG))
-    cache_scan_free(NULL, (struct all_addr *)host_address, 0, F_IPV4 | F_REVERSE);
-  
- newrec:
+  if ((crec = cache_find_by_addr(NULL, (struct all_addr *)host_address, 0, F_IPV4)))
+    {
+      if (crec->flags & F_NEG)
+	cache_scan_free(NULL, (struct all_addr *)host_address, 0, F_IPV4 | F_REVERSE);
+      else
+	/* avoid multiple reverse mappings */
+	flags &= ~F_REVERSE;
+    }
+
   if ((crec = dhcp_spare))
     dhcp_spare = dhcp_spare->prev;
   else /* need new one */
@@ -669,12 +708,12 @@ void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t
   
   if (crec) /* malloc may fail */
     {
-      crec->flags = F_DHCP | F_FORWARD | F_IPV4 | flags;
+      crec->flags = flags;
       if (ttd == 0)
 	crec->flags |= F_IMMORTAL;
       else
 	crec->ttd = ttd;
-      crec->addr.addr.addr4 = *host_address;
+      crec->addr.addr.addr.addr4 = *host_address;
       crec->name.namep = host_name;
       crec->prev = dhcp_inuse;
       dhcp_inuse = crec;
@@ -684,12 +723,12 @@ void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t
 
 
 
-void dump_cache(int debug, int cache_size)
+void dump_cache(struct daemon *daemon)
 {
-  syslog(LOG_INFO, "Cache size %d, %d/%d cache insertions re-used unexpired cache entries.", 
-	 cache_size, cache_live_freed, cache_inserted); 
+  syslog(LOG_INFO, "cache size %d, %d/%d cache insertions re-used unexpired cache entries.", 
+	 daemon->cachesize, cache_live_freed, cache_inserted); 
   
-  if (debug)
+  if (daemon->options & (OPT_DEBUG | OPT_LOG))
     {
       struct crec *cache ;
       char addrbuff[ADDRSTRLEN];
@@ -701,14 +740,21 @@ void dump_cache(int debug, int cache_size)
 	  {
 	    if ((cache->flags & F_NEG) && (cache->flags & F_FORWARD))
 	      addrbuff[0] = 0;
+	    else if (cache->flags & F_CNAME) 
+	      {
+		addrbuff[0] = 0;
+		addrbuff[ADDRSTRLEN-1] = 0;
+		if (!is_outdated_cname_pointer(cache))
+		  strncpy(addrbuff, cache_get_name(cache->addr.cname.cache), ADDRSTRLEN);
+	      }
 #ifdef HAVE_IPV6
 	    else if (cache->flags & F_IPV4)
-	      inet_ntop(AF_INET, &cache->addr, addrbuff, ADDRSTRLEN);
+	      inet_ntop(AF_INET, &cache->addr.addr, addrbuff, ADDRSTRLEN);
 	    else if (cache->flags & F_IPV6)
-	      inet_ntop(AF_INET6, &cache->addr, addrbuff, ADDRSTRLEN);
+	      inet_ntop(AF_INET6, &cache->addr.addr, addrbuff, ADDRSTRLEN);
 #else
             else 
-	      strcpy(addrbuff, inet_ntoa(cache->addr.addr.addr4));
+	      strcpy(addrbuff, inet_ntoa(cache->addr.addr.addr.addr4));
 #endif
 	    syslog(LOG_DEBUG, 
 #ifdef HAVE_BROKEN_RTC
@@ -719,6 +765,7 @@ void dump_cache(int debug, int cache_size)
 		   cache_get_name(cache), addrbuff,
 		   cache->flags & F_IPV4 ? "4" : "",
 		   cache->flags & F_IPV6 ? "6" : "",
+		   cache->flags & F_CNAME ? "C" : "",
 		   cache->flags & F_FORWARD ? "F" : " ",
 		   cache->flags & F_REVERSE ? "R" : " ",
 		   cache->flags & F_IMMORTAL ? "I" : " ",
@@ -726,27 +773,45 @@ void dump_cache(int debug, int cache_size)
 		   cache->flags & F_NEG ? "N" : " ",
 		   cache->flags & F_NXDOMAIN ? "X" : " ",
 		   cache->flags & F_HOSTS ? "H" : " ",
-		   cache->flags & F_ADDN ? "A" : " ",
 #ifdef HAVE_BROKEN_RTC
-		   cache->flags & F_IMMORTAL ? 0: (unsigned long)cache->ttd) ;
+		   cache->flags & F_IMMORTAL ? 0: (unsigned long)cache->ttd
 #else
-		   cache->flags & F_IMMORTAL ? "\n" : ctime(&(cache->ttd))) ;
+	           cache->flags & F_IMMORTAL ? "\n" : ctime(&(cache->ttd)) 
 #endif
-	  }
-      
-    }
+		   );
+	  }  
+    } 
 }
 
+static char *record_source(struct hostsfile *addn_hosts, int index)
+{
+  char *source = HOSTSFILE;
+  while (addn_hosts)
+    { 
+      if (addn_hosts->index == index)
+	{
+	  source = addn_hosts->fname;
+	  break;
+	}
+      addn_hosts = addn_hosts->next;
+    }
 
-void log_query(unsigned short flags, char *name, struct all_addr *addr)
+  return source;
+}
+
+void log_query(unsigned short flags, char *name, struct all_addr *addr, 
+	       unsigned short type, struct hostsfile *addn_hosts, int index)
 {
   char *source;
   char *verb = "is";
+  char types[20];
   char addrbuff[ADDRSTRLEN];
-  
+
   if (!log_queries)
     return;
   
+  strcpy(types, " ");
+  
   if (flags & F_NEG)
     {
       if (flags & F_REVERSE)
@@ -767,6 +832,8 @@ void log_query(unsigned short flags, char *name, struct all_addr *addr)
       else if (flags & F_IPV6)
 	strcat(addrbuff, "-IPv6");
     }
+  else if (flags & F_CNAME)
+    strcpy(addrbuff, "<CNAME>");
   else
 #ifdef HAVE_IPV6
     inet_ntop(flags & F_IPV4 ? AF_INET : AF_INET6,
@@ -774,17 +841,12 @@ void log_query(unsigned short flags, char *name, struct all_addr *addr)
 #else
     strcpy(addrbuff, inet_ntoa(addr->addr.addr4));  
 #endif
-  
+    
   if (flags & F_DHCP)
     source = "DHCP";
   else if (flags & F_HOSTS)
-    {
-      if (flags & F_ADDN)
-	source = addn_file;
-      else
-	source = HOSTSFILE;
-    }
-   else if (flags & F_CONFIG)
+    source = record_source(addn_hosts, index);
+  else if (flags & F_CONFIG)
     source = "config";
   else if (flags & F_UPSTREAM)
     source = "reply";
@@ -795,6 +857,47 @@ void log_query(unsigned short flags, char *name, struct all_addr *addr)
     }
   else if (flags & F_QUERY)
     {
+      unsigned int i;
+      static struct {
+	unsigned int type;
+	char *name;
+      } typestr[] = {
+	{ 1,   "A" },
+	{ 2,   "NS" },
+	{ 5,   "CNAME" },
+	{ 6,   "SOA" },
+	{ 10,  "NULL" },
+	{ 11,  "WKS" },
+	{ 12,  "PTR" },
+	{ 13,  "HINFO" },	
+        { 15,  "MX" },
+	{ 16,  "TXT" },
+	{ 22,  "NSAP" },
+	{ 23,  "NSAP_PTR" },
+	{ 24,  "SIG" },
+	{ 25,  "KEY" },
+	{ 28,  "AAAA" },
+ 	{ 33,  "SRV" },
+        { 36,  "KX" },
+        { 37,  "CERT" },
+        { 38,  "A6" },
+        { 39,  "DNAME" },
+	{ 41,  "OPT" },
+	{ 250, "TSIG" },
+	{ 251, "IXFR" },
+	{ 252, "AXFR" },
+        { 253, "MAILB" },
+	{ 254, "MAILA" },
+	{ 255, "ANY" }
+      };
+      
+      if (type != 0)
+        {
+          sprintf(types, "[type=%d] ", type); 
+          for (i = 0; i < (sizeof(typestr)/sizeof(typestr[0])); i++)
+	    if (typestr[i].type == type)
+	      sprintf(types,"[%s] ", typestr[i].name);
+	}
       source = "query";
       verb = "from";
     }
@@ -802,7 +905,7 @@ void log_query(unsigned short flags, char *name, struct all_addr *addr)
     source = "cached";
   
   if ((flags & F_FORWARD) | (flags & F_NEG))
-    syslog(LOG_DEBUG, "%s %s %s %s", source, name, verb, addrbuff);
+    syslog(LOG_DEBUG, "%s %s%s%s %s", source, name, types, verb, addrbuff);
   else if (flags & F_REVERSE)
     syslog(LOG_DEBUG, "%s %s is %s", source, addrbuff, name);
 }

src/config.h

@@ -12,12 +12,16 @@
 
 /* Author's email: simon@thekelleys.org.uk */
 
-#define VERSION "2.3"
+#define VERSION "2.17"
 
 #define FTABSIZ 150 /* max number of outstanding requests */
-#define TIMEOUT 20 /* drop queries after TIMEOUT seconds */
+#define MAX_PROCS 20 /* max no children for TCP requests */
+#define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
+#define EDNS_PKTSZ 1280 /* default max EDNS.0 UDP packet from RFC2671 */
+#define TIMEOUT 20 /* drop UDP queries after TIMEOUT seconds */
 #define LOGRATE 120 /* log table overflows every LOGRATE seconds */
 #define CACHESIZ 150 /* default cache size */
+#define MAXTOK 50 /* token in DHCP leases */
 #define MAXLEASES 150 /* maximum number of DHCP leases */
 #define SMALLDNAME 40 /* most domain names are smaller than this */
 #define HOSTSFILE "/etc/hosts"
@@ -30,9 +34,12 @@
 #define RUNFILE "/var/run/dnsmasq.pid"
 #if defined(__FreeBSD__) || defined (__OpenBSD__)
 #   define LEASEFILE "/var/db/dnsmasq.leases"
-#   define CONFFILE "/usr/local/etc/dnsmasq.conf"
 #else
 #   define LEASEFILE "/var/lib/misc/dnsmasq.leases"
+#endif
+#if defined(__FreeBSD__)
+#   define CONFFILE "/usr/local/etc/dnsmasq.conf"
+#else
 #   define CONFFILE "/etc/dnsmasq.conf"
 #endif
 #define DEFLEASE 3600 /* default lease time, 1 hour */
@@ -57,23 +64,21 @@
 #  define DNSMASQ_LOG_FAC(debug)  LOG_DAEMON
 #endif
 
+/* A small collection of RR-types which are missing on some platforms */
 
-/* determine if we can find the destination address of recieved packets
-   and set the source address of sent ones. If so, we can use one socket
-   bound to INADDR_ANY and cope with dynamically created interfaces.
-   Linux does this differently to FreeBSD. */
+#ifndef T_SRV
+#  define T_SRV 33
+#endif
 
-#if defined(IP_PKTINFO) || (defined(IP_RECVDSTADDR) && defined(IP_RECVIF) && defined(IP_SENDSRCADDR))
-#  define HAVE_UDP_SRC_DST
-#else
-#  undef HAVE_UDP_SRC_DST
+#ifndef T_OPT
+#  define T_OPT 41
 #endif
 
 /* Decide if we're going to support IPv6 */
 /* We assume that systems which don't have IPv6
    headers don't have ntop and pton either */
 
-#if defined(INET6_ADDRSTRLEN) && !defined(NO_IPV6)
+#if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6)
 #  define HAVE_IPV6
 #  define ADDRSTRLEN INET6_ADDRSTRLEN
 #  if defined(SOL_IPV6)
@@ -99,7 +104,6 @@
    new system, you may want to edit these. 
    May replace this with Autoconf one day. 
 
-
 HAVE_LINUX_IPV6_PROC
    define this to do IPv6 interface discovery using
    proc/net/if_inet6 ala LINUX. 
@@ -121,6 +125,10 @@ HAVE_BROKEN_RTC
    work on other systems by teaching dnsmasq_time() in utils.c how to
    read the system uptime.
 
+HAVE_ISC_READER 
+   define this to include the old ISC dhcpcd integration. Note that you cannot
+   set both HAVE_ISC_READER and HAVE_BROKEN_RTC.
+
 HAVE_GETOPT_LONG
    define this if you have GNU libc or GNU getopt. 
 
@@ -148,7 +156,7 @@ HAVE_PSELECT
    If your C library implements pselect, define this.
 
 HAVE_BPF
-   If your OS implements Berkeley PAcket filter, define this.
+   If your OS implements Berkeley Packet filter, define this.
 
 NOTES:
    For Linux you should define 
@@ -168,13 +176,25 @@ NOTES:
    you should NOT define  
      HAVE_LINUX_IPV6_PROC 
    and you MAY define  
-     HAVE_ARC4RANDOM - OpenBSD and FreeBSD 
-     HAVE_DEV_URANDOM - OpenBSD and FreeBSD
-     HAVE_DEV_RANDOM - FreeBSD (OpenBSD with hardware random number generator)
-     HAVE_GETOPT_LONG - only if you link GNU getopt. 
+     HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later
+     HAVE_DEV_URANDOM - OpenBSD and FreeBSD and NetBSD
+     HAVE_DEV_RANDOM - FreeBSD  and NetBSD 
+                       (OpenBSD with hardware random number generator)
+     HAVE_GETOPT_LONG - NetBSD 
+                       (FreeBSD and OpenBSD only if you link GNU getopt) 
 
 */
 
+/* platform independent options. */
+#undef HAVE_BROKEN_RTC
+#define HAVE_ISC_READER
+
+#if defined(HAVE_BROKEN_RTC) && defined(HAVE_ISC_READER)
+#  error HAVE_ISC_READER is not compatible with HAVE_BROKEN_RTC
+#endif
+
+/* platform dependent options. */
+
 /* Must preceed __linux__ since uClinux defines __linux__ too. */
 #if defined(__uClinux__) || defined(__UCLIBC__)
 #undef HAVE_LINUX_IPV6_PROC
@@ -209,7 +229,6 @@ NOTES:
 #undef HAVE_SOCKADDR_SA_LEN
 #undef HAVE_PSELECT
 /* Fix various misfeatures of libc5 headers */
-#define T_SRV 33 
 typedef unsigned long in_addr_t; 
 typedef size_t socklen_t;
 
@@ -233,9 +252,6 @@ typedef unsigned long in_addr_t;
 #endif
 #endif
 
-/* #elif defined(__OpenBSD__)
-#error The sockets API in OpenBSD does not provide facilities required by dnsmasq
-*/
 #elif defined(__FreeBSD__) || defined(__OpenBSD__)
 #undef HAVE_LINUX_IPV6_PROC
 #undef HAVE_GETOPT_LONG
@@ -255,19 +271,19 @@ typedef unsigned long in_addr_t;
 #define HAVE_SOCKADDR_SA_LEN
 #undef HAVE_PSELECT
 #define HAVE_BPF
+#define BIND_8_COMPAT
 /* Define before sys/socket.h is included so we get socklen_t */
 #define _BSD_SOCKLEN_T_
-/* The two below are not defined in Mac OS X arpa/nameserv.h */
+/* This is not defined in Mac OS X arpa/nameserv.h */
 #define IN6ADDRSZ 16
-#define T_SRV 33
  
 #elif defined(__NetBSD__)
 #undef HAVE_LINUX_IPV6_PROC
-#undef HAVE_GETOPT_LONG
+#define HAVE_GETOPT_LONG
 #undef HAVE_ARC4RANDOM
 #define HAVE_RANDOM
-#undef HAVE_DEV_URANDOM
-#undef HAVE_DEV_RANDOM
+#define HAVE_DEV_URANDOM
+#define HAVE_DEV_RANDOM
 #define HAVE_SOCKADDR_SA_LEN
 #undef HAVE_PSELECT
 #define HAVE_BPF
@@ -287,3 +303,4 @@ typedef unsigned long in_addr_t;
 
 
 
+

src/dhcp.c

@@ -14,60 +14,94 @@
 
 #include "dnsmasq.h"
 
-void dhcp_init(int *fdp, int* rfdp)
+void dhcp_init(struct daemon *daemon)
 {
   int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
   struct sockaddr_in saddr;
-  int opt = 1;
-  
+  int flags, oneopt = 1, zeroopt = 0;
+  struct dhcp_config *configs, *cp;
+
   if (fd == -1)
-    die ("Cannot create DHCP socket : %s", NULL);
+    die ("cannot create DHCP socket : %s", NULL);
   
-  if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+  if ((flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
 #if defined(IP_PKTINFO)
-      setsockopt(fd, SOL_IP, IP_PKTINFO, &opt, sizeof(opt)) == -1 ||
+      setsockopt(fd, SOL_IP, IP_PKTINFO, &oneopt, sizeof(oneopt)) == -1 ||
 #elif defined(IP_RECVIF)
-      setsockopt(fd, IPPROTO_IP, IP_RECVIF, &opt, sizeof(opt)) == -1 ||
+      setsockopt(fd, IPPROTO_IP, IP_RECVIF, &oneopt, sizeof(oneopt)) == -1 ||
 #endif
-      setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &opt, sizeof(opt)) == -1)  
+      setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &oneopt, sizeof(oneopt)) == -1)  
     die("failed to set options on DHCP socket: %s", NULL);
   
   saddr.sin_family = AF_INET;
   saddr.sin_port = htons(DHCP_SERVER_PORT);
   saddr.sin_addr.s_addr = INADDR_ANY;
+#ifdef HAVE_SOCKADDR_SA_LEN
+  saddr.sin_len = sizeof(struct sockaddr_in);
+#endif
+
   if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in)))
     die("failed to bind DHCP server socket: %s", NULL);
 
-  *fdp = fd;
+  daemon->dhcpfd = fd;
+
+  if ((fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP)) == -1 ||
+      (flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+      setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &oneopt, sizeof(oneopt)) ||
+      setsockopt(fd, SOL_SOCKET, SO_DONTROUTE, &zeroopt, sizeof(zeroopt)) == -1)
+    die("cannot create ICMP raw socket: %s.", NULL);
+
+  daemon->dhcp_icmp_fd = fd;
 
 #ifdef HAVE_BPF
-  opt = 0;
-  while (1) 
-    {
-      char filename[50];
-      sprintf(filename, "/dev/bpf%d", opt++);
-      if ((fd = open(filename, O_RDWR, 0)) != -1)
-	break;
-      if (errno != EBUSY)
-	die("Cannot create DHCP BPF socket: %s", NULL);
-    }	    
+  { 
+    int i = 0;
+    while (1) 
+      {
+	char filename[50];
+	sprintf(filename, "/dev/bpf%d", i++);
+	if ((fd = open(filename, O_RDWR, 0)) != -1)
+	  break;
+	if (errno != EBUSY)
+	  die("cannot create DHCP BPF socket: %s", NULL);
+      }	    
+  }
 #else
-  if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_IP))) == -1)
-    die("Cannot create DHCP packet socket: %s", NULL);
+  /* since we don't ever use the packet socket for reception,
+     and it receives copies of _all_ IP packets, then that data
+     will build up in kernel buffers, wasting memory. Set the
+     socket receive buffer size to one to avoid that. (zero is
+     rejected as non-sensical by some BSD kernels) */
+  if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_IP))) == -1 ||
+      setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &oneopt, sizeof(oneopt)) == -1)
+    die("cannot create DHCP packet socket: %s. "
+	"Is CONFIG_PACKET enabled in your kernel?", NULL);
 #endif
   
-  *rfdp = fd;
+  daemon->dhcp_raw_fd = fd;
+  
+  /* If the same IP appears in more than one host config, then DISCOVER
+     for one of the hosts will get the address, but REQUEST will be NAKed,
+     since the address is reserved by the other one -> protocol loop. */
+  for (configs = daemon->dhcp_conf; configs; configs = configs->next)
+    for (cp = configs->next; cp; cp = cp->next)
+      if ((configs->flags & cp->flags & CONFIG_ADDR) &&	configs->addr.s_addr == cp->addr.s_addr)
+	die("duplicate IP address %s in dhcp-config directive.", inet_ntoa(cp->addr));
+  
+  daemon->dhcp_packet = safe_malloc(sizeof(struct udp_dhcp_packet));
+  /* These two each hold a DHCP option max size 256 
+     and get a terminating zero added */
+  daemon->dhcp_buff = safe_malloc(257);
+  daemon->dhcp_buff2 = safe_malloc(257); 
+
 }
 
-void dhcp_packet(struct dhcp_context *contexts, char *packet, 
-		 struct dhcp_opt *dhcp_opts, struct dhcp_config *dhcp_configs, 
-		 time_t now, char *namebuff, char *domain_suffix,
-		 char *dhcp_file, char *dhcp_sname, 
-		 struct in_addr dhcp_next_server, int dhcp_fd, int raw_fd,
-		 struct iname *names, struct iname *addrs, struct iname *except)
+void dhcp_packet(struct daemon *daemon, time_t now)
 {
-  struct udp_dhcp_packet *rawpacket = (struct udp_dhcp_packet *)packet;
-  struct dhcp_packet *mess = (struct dhcp_packet *)&rawpacket->data;
+  struct udp_dhcp_packet *rawpacket = daemon->dhcp_packet;
+  struct dhcp_packet *mess = &rawpacket->data;
   struct dhcp_context *context;
   struct iname *tmp;
   struct ifreq ifr;
@@ -75,7 +109,7 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
   struct iovec iov[2];
   struct cmsghdr *cmptr;
   int sz, newlen, iface_index = 0;
-  struct in_addr source, real_netmask, iface_addr, netmask_save, broadcast_save;
+  struct in_addr iface_netmask, iface_addr, iface_broadcast;
 #ifdef HAVE_BPF
   unsigned char iface_hwaddr[ETHER_ADDR_LEN];
 #endif
@@ -89,8 +123,8 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
 #endif
   } control_u;
   
-  iov[0].iov_base = (char *)&rawpacket->data;
-  iov[0].iov_len = DNSMASQ_PACKETSZ - (sizeof(struct ip) + sizeof(struct udphdr));
+  iov[0].iov_base = (char *)mess;
+  iov[0].iov_len = sizeof(struct dhcp_packet);
 
   msg.msg_control = control_u.control;
   msg.msg_controllen = sizeof(control_u);
@@ -100,7 +134,7 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
   msg.msg_iov = iov;
   msg.msg_iovlen = 1;
   
-  sz = recvmsg(dhcp_fd, &msg, 0);
+  sz = recvmsg(daemon->dhcpfd, &msg, 0);
   
   if (sz < (int)(sizeof(*mess) - sizeof(mess->options)))
     return;
@@ -112,7 +146,8 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
     if (cmptr->cmsg_level == SOL_IP && cmptr->cmsg_type == IP_PKTINFO)
       iface_index = ((struct in_pktinfo *)CMSG_DATA(cmptr))->ipi_ifindex;
   
-  if (!iface_index || !if_indextoname(iface_index, ifr.ifr_name))
+  if (!(ifr.ifr_ifindex = iface_index) || 
+      ioctl(daemon->dhcpfd, SIOCGIFNAME, &ifr) == -1)
     return;
 
 #elif defined(IP_RECVIF)
@@ -126,39 +161,37 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
     return;
 
 #else
-  if (!names || !names->name || names->next)
-    {
-      syslog(LOG_ERR, "must set exactly one interface on broken systems without IP_RECVIF");
-      return;
-    }
-  else
-    strcpy(ifr.ifr_name, names->name);
+  {
+    struct iname *name;
+    for (name = daemon->if_names; name->isloop; name = name->next);
+    strcpy(ifr.ifr_name, name->name);
+  }
 #endif
 
 #ifdef HAVE_BPF
   ifr.ifr_addr.sa_family = AF_LINK;
-  if (ioctl(dhcp_fd, SIOCGIFADDR, &ifr) < 0)
+  if (ioctl(daemon->dhcpfd, SIOCGIFADDR, &ifr) < 0)
     return;
   memcpy(iface_hwaddr, LLADDR((struct sockaddr_dl *)&ifr.ifr_addr), ETHER_ADDR_LEN);
 #endif
   
   ifr.ifr_addr.sa_family = AF_INET;
-  if (ioctl(dhcp_fd, SIOCGIFADDR, &ifr) < 0 )
+  if (ioctl(daemon->dhcpfd, SIOCGIFADDR, &ifr) < 0 )
     return;
   iface_addr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
 
   /* enforce available interface configuration */
-  for (tmp = except; tmp; tmp = tmp->next)
+  for (tmp = daemon->if_except; tmp; tmp = tmp->next)
     if (tmp->name && (strcmp(tmp->name, ifr.ifr_name) == 0))
       return;
   
-  if (names || addrs)
+  if (daemon->if_names || daemon->if_addrs)
     {
-      for (tmp = names; tmp; tmp = tmp->next)
+      for (tmp = daemon->if_names; tmp; tmp = tmp->next)
 	if (tmp->name && (strcmp(tmp->name, ifr.ifr_name) == 0))
 	  break;
       if (!tmp)
-	for (tmp = addrs; tmp; tmp = tmp->next)
+	for (tmp = daemon->if_addrs; tmp; tmp = tmp->next)
 	  if (tmp->addr.sa.sa_family == AF_INET && 
 	      tmp->addr.in.sin_addr.s_addr == iface_addr.s_addr)
 	    break;
@@ -166,69 +199,82 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
 	return; 
     }
   
-  /* If the packet came via a relay, use that address to look up the context,
-     else use the address of the interface is arrived on. */
-   source = mess->giaddr.s_addr ? mess->giaddr : iface_addr;
-
-   for (context = contexts; context; context = context->next)
+  iface_netmask.s_addr = 0;
+  iface_broadcast.s_addr = 0;
+  
+  for (context = daemon->dhcp; context; context = context->next)
     {
-      if (!context->netmask.s_addr && !mess->giaddr.s_addr && ioctl(dhcp_fd, SIOCGIFNETMASK, &ifr) != -1)
-	real_netmask = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
-      else
-	real_netmask = context->netmask;
-      
-      if (real_netmask.s_addr && 
-	  (source.s_addr & real_netmask.s_addr) == (context->start.s_addr & real_netmask.s_addr) &&
-	  (source.s_addr & real_netmask.s_addr) == (context->end.s_addr & real_netmask.s_addr))
-	break;
+      /* Fill in missing netmask and broadcast address values for any approriate
+	 dhcp-ranges which match this interface and don't have them. */
+      if (!context->netmask.s_addr)
+	{
+	  if (!iface_netmask.s_addr && ioctl(daemon->dhcpfd, SIOCGIFNETMASK, &ifr) != -1)
+	    iface_netmask = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
+	  
+	  if (iface_netmask.s_addr &&
+	      (is_same_net(iface_addr, context->start, iface_netmask) ||
+	       is_same_net(iface_addr, context->end, iface_netmask)))
+	    {
+	      context->netmask = iface_netmask; 
+	      if (!(is_same_net(iface_addr, context->start, iface_netmask) &&
+		    is_same_net(iface_addr, context->end, iface_netmask)))
+		{
+		   strcpy(daemon->dhcp_buff, inet_ntoa(context->start));
+		   strcpy(daemon->dhcp_buff2, inet_ntoa(context->end));
+		   syslog(LOG_WARNING, "DHCP range %s -- %s is not consistent with netmask %s",
+			  daemon->dhcp_buff, daemon->dhcp_buff2, inet_ntoa(iface_netmask));
+		}
+	    }
+	}    
+	 
+      /* Determine "default" default routes. These are to this server or the relay agent.
+	 Also broadcast addresses, if not specified */
+      if (context->netmask.s_addr)
+	{
+	  if (is_same_net(iface_addr, context->start, context->netmask))
+	    {
+	      if (!context->router.s_addr)
+		context->router = iface_addr;
+	      if (!context->broadcast.s_addr)
+		{
+		  if (!iface_broadcast.s_addr && ioctl(daemon->dhcpfd, SIOCGIFBRDADDR, &ifr) != -1)
+		    iface_broadcast = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
+		  if (iface_broadcast.s_addr && 
+		      is_same_net(iface_broadcast, context->start, context->netmask))
+		    context->broadcast = iface_broadcast;
+		  else 
+		    context->broadcast.s_addr  = context->start.s_addr | ~context->netmask.s_addr;
+		}
+	    }	
+	  else if (mess->giaddr.s_addr && is_same_net(mess->giaddr, context->start, context->netmask))
+	    {
+	      if (!context->router.s_addr)
+		context->router = mess->giaddr;
+	      /* fill in missing broadcast addresses for relayed ranges */
+	      if (!context->broadcast.s_addr)
+		context->broadcast.s_addr  = context->start.s_addr | ~context->netmask.s_addr;
+	    }
+	}
     }
-      
-  if (!context)
-    {
-      syslog(LOG_WARNING, "no address range available for DHCP request via %s", inet_ntoa(source));
-      return;
-    }
-  
-  netmask_save = context->netmask;
-  broadcast_save = context->broadcast;
-  
-  context->netmask = real_netmask;
-  
-  if (!context->broadcast.s_addr)
-    {
-      if (mess->giaddr.s_addr)
-	context->broadcast.s_addr = (mess->giaddr.s_addr & real_netmask.s_addr) | ~real_netmask.s_addr;
-      else if (ioctl(dhcp_fd, SIOCGIFBRDADDR, &ifr) != -1)
-	context->broadcast = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
-      else
-	context->broadcast.s_addr = (iface_addr.s_addr & real_netmask.s_addr) | ~real_netmask.s_addr;
-    }
-  
-  if (ioctl(dhcp_fd, SIOCGIFMTU, &ifr) == -1)
-   ifr.ifr_mtu = ETHERMTU;
   
   lease_prune(NULL, now); /* lose any expired leases */
-  newlen = dhcp_reply(context, iface_addr, ifr.ifr_name, ifr.ifr_mtu, 
-		      rawpacket, sz, now, namebuff, 
-		      dhcp_opts, dhcp_configs, domain_suffix, dhcp_file,
-		      dhcp_sname, dhcp_next_server);
+  newlen = dhcp_reply(daemon, iface_addr, ifr.ifr_name, sz, now);
   lease_update_file(0, now);
-  lease_update_dns();
-	  
-  context->netmask = netmask_save;
-  context->broadcast = broadcast_save;
+  lease_update_dns(daemon);
   
   if (newlen == 0)
     return;
   
   if (mess->giaddr.s_addr || mess->ciaddr.s_addr)
     {
-      /* To send to BOOTP relay or configured client, use 
-	 the IP packet */
+      /* To send to BOOTP relay or configured client, use the IP packet */
       
       struct sockaddr_in dest;
       dest.sin_family = AF_INET;
-      
+#ifdef HAVE_SOCKADDR_SA_LEN
+      dest.sin_len = sizeof(struct sockaddr_in);
+#endif
+     
       if (mess->giaddr.s_addr)
 	{
 	  dest.sin_port = htons(DHCP_SERVER_PORT);
@@ -240,7 +286,9 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
 	  dest.sin_addr = mess->ciaddr;
 	}
       
-      sendto(dhcp_fd, mess, newlen, 0, (struct sockaddr *)&dest, sizeof(dest));
+      while(sendto(daemon->dhcpfd, mess, newlen, 0, 
+		   (struct sockaddr *)&dest, sizeof(dest)) == -1 &&
+	    retry_send());
     }
   else
     {
@@ -304,13 +352,13 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
 	memcpy(header.ether_shost, iface_hwaddr, ETHER_ADDR_LEN);
 	memcpy(header.ether_dhost, hwdest, ETHER_ADDR_LEN); 
 	
-	ioctl(raw_fd, BIOCSETIF, &ifr);
+	ioctl(daemon->dhcp_raw_fd, BIOCSETIF, &ifr);
 	
 	iov[0].iov_base = (char *)&header;
 	iov[0].iov_len = sizeof(struct ether_header);
 	iov[1].iov_base = (char *)rawpacket;
 	iov[1].iov_len = ntohs(rawpacket->ip.ip_len);
-	writev(raw_fd, iov, 2);
+	while (writev(daemon->dhcp_raw_fd, iov, 2) == -1 && retry_send());
 #else
 	struct sockaddr_ll dest;
 	
@@ -319,68 +367,88 @@ void dhcp_packet(struct dhcp_context *contexts, char *packet,
 	dest.sll_ifindex = iface_index;
 	dest.sll_protocol = htons(ETHERTYPE_IP);
 	memcpy(dest.sll_addr, hwdest, ETHER_ADDR_LEN); 
-	sendto(raw_fd, rawpacket, ntohs(rawpacket->ip.ip_len), 
-	       0, (struct sockaddr *)&dest, sizeof(dest));
-	
+	while (sendto(daemon->dhcp_raw_fd, rawpacket, ntohs(rawpacket->ip.ip_len), 
+		      0, (struct sockaddr *)&dest, sizeof(dest)) == -1 &&
+	       retry_send());
 #endif
       }
     }
 }
 
-	  
 int address_available(struct dhcp_context *context, struct in_addr taddr)
 {
-  /* Check is an address is OK for this network, ie
-     within allowable range and not in an existing lease */
+  /* Check is an address is OK for this network, check all
+     possible ranges. */
   
-  unsigned int addr, start, end;
+  unsigned int start, end, addr = ntohl(taddr.s_addr);
   
-  addr = ntohl(taddr.s_addr);
-  start = ntohl(context->start.s_addr);
-  end = ntohl(context->end.s_addr);
+  for (; context; context = context->current)
+    {
+      start = ntohl(context->start.s_addr);
+      end = ntohl(context->end.s_addr);
 
-  if (addr < start)
-    return 0;
+      if (!context->static_only &&
+	  addr >= start &&
+	  addr <= end)
+	return 1;
+    }
 
-  if (addr > end)
-    return 0;
-
-  if (lease_find_by_addr(taddr))
-    return 0;
+  return 0;
+}
+ 
+struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr)
+{
+  struct dhcp_config *config;
   
-  return 1;
+  for (config = configs; config; config = config->next)
+    if ((config->flags & CONFIG_ADDR) && config->addr.s_addr == addr.s_addr)
+      return config;
+
+  return NULL;
 }
 
-int address_allocate(struct dhcp_context *context, struct dhcp_config *configs,
-		     struct in_addr *addrp)   
+int address_allocate(struct dhcp_context *context, struct daemon *daemon,
+		     struct in_addr *addrp, unsigned char *hwaddr)   
 {
-  /* Find a free address: exlude anything in use and anything allocated to
+  /* Find a free address: exclude anything in use and anything allocated to
      a particular hwaddr/clientid/hostname in our configuration */
 
-  struct dhcp_config *config;
-  struct in_addr start = context->last;
+  struct in_addr start, addr ;
+  unsigned int i, j;
   
-  do {
-    if (context->last.s_addr == context->end.s_addr)
-      context->last = context->start;
-    else
-      context->last.s_addr = htonl(ntohl(context->last.s_addr) + 1);
-
-    
-    if (!lease_find_by_addr(context->last))
+  for (; context; context = context->current)
+    if (!context->static_only)
       {
-	for (config = configs; config; config = config->next)
-	  if (config->addr.s_addr == context->last.s_addr)
-	    break;
+	/* pick a seed based on hwaddr then iterate until we find a free address. */
+	for (j = context->addr_epoch, i = 0; i < ETHER_ADDR_LEN; i++)
+	  j += hwaddr[i] + (hwaddr[i] << 8) + (hwaddr[i] << 16);
 	
-	if (!config)
-	  {
-	    *addrp = context->last;
-	    return 1;
-	  }
+	start.s_addr = addr.s_addr = 
+	  htonl(ntohl(context->start.s_addr) + 
+		(j % (1 + ntohl(context->end.s_addr) - ntohl(context->start.s_addr))));
+	
+	do {
+	  if (!lease_find_by_addr(addr) && 
+	      !config_find_by_address(daemon->dhcp_conf, addr))
+	    {
+	      if (icmp_ping(daemon, addr))
+		/* perturb address selection so that we are
+		   less likely to try this address again. */
+		context->addr_epoch++;
+	      else
+		{
+		  *addrp = addr;
+		  return 1;
+		}
+	    }
+
+	  addr.s_addr = htonl(ntohl(addr.s_addr) + 1);
+	  
+	  if (addr.s_addr == htonl(ntohl(context->end.s_addr) + 1))
+	    addr = context->start;
+	  
+	} while (addr.s_addr != start.s_addr);
       }
-  } while (context->last.s_addr != start.s_addr);
-  
   return 0;
 }
 
@@ -388,9 +456,9 @@ static int is_addr_in_context(struct dhcp_context *context, struct dhcp_config *
 {
   if (!context)
     return 1;
-  if (config->addr.s_addr == 0)
+  if (!(config->flags & CONFIG_ADDR))
     return 1;
-  if ((config->addr.s_addr & context->netmask.s_addr) == (context->start.s_addr & context->netmask.s_addr))
+  if (is_same_net(config->addr, context->start, context->netmask))
     return 1;
   
   return 0;
@@ -405,58 +473,64 @@ struct dhcp_config *find_config(struct dhcp_config *configs,
   
   if (clid_len)
     for (config = configs; config; config = config->next)
-      {
-	if (config->clid_len == clid_len && 
-	    memcmp(config->clid, clid, clid_len) == 0 &&
-	    is_addr_in_context(context, config))
-	  return config;
-	
-	/* dhcpcd prefixes ASCII client IDs by zero which is wrong, but we try and
-	   cope with that here */
-	if (*clid == 0 && config->clid_len == clid_len-1  &&
-	    memcmp(config->clid, clid+1, clid_len-1) == 0 &&
-	    is_addr_in_context(context, config))
-	  return config;
-      }
-    
+      if (config->flags & CONFIG_CLID)
+	{
+	  if (config->clid_len == clid_len && 
+	      memcmp(config->clid, clid, clid_len) == 0 &&
+	      is_addr_in_context(context, config))
+	    return config;
+	  
+	  /* dhcpcd prefixes ASCII client IDs by zero which is wrong, but we try and
+	     cope with that here */
+	  if (*clid == 0 && config->clid_len == clid_len-1  &&
+	      memcmp(config->clid, clid+1, clid_len-1) == 0 &&
+	      is_addr_in_context(context, config))
+	    return config;
+	}
+  
   for (config = configs; config; config = config->next)
-    if (memcmp(config->hwaddr, hwaddr, ETHER_ADDR_LEN) == 0 &&
+    if ((config->flags & CONFIG_HWADDR) &&
+	memcmp(config->hwaddr, hwaddr, ETHER_ADDR_LEN) == 0 &&
 	is_addr_in_context(context, config))
       return config;
   
   if (hostname)
     for (config = configs; config; config = config->next)
-      if (config->hostname && strcmp(config->hostname, hostname) == 0 &&
+      if ((config->flags & CONFIG_NAME) && 
+	  hostname_isequal(config->hostname, hostname) &&
 	  is_addr_in_context(context, config))
 	return config;
   
   return NULL;
 }
 
-struct dhcp_config *dhcp_read_ethers(struct dhcp_config *configs, char *buff)
+void dhcp_read_ethers(struct daemon *daemon)
 {
   FILE *f = fopen(ETHERSFILE, "r");
-  unsigned int e0, e1, e2, e3, e4, e5;
-  char *ip, *cp, *name;
+  unsigned int flags, e0, e1, e2, e3, e4, e5;
+  char *buff = daemon->namebuff;
+  char *ip, *cp;
   struct in_addr addr;
-  struct dhcp_config *new;
+  unsigned char hwaddr[ETHER_ADDR_LEN];
+  struct dhcp_config *config, *configs = daemon->dhcp_conf;
+  int count = 0;
   
   if (!f)
-    die("Failed to open " ETHERSFILE ":%s", NULL);
-  
+    {
+      syslog(LOG_ERR, "failed to read " ETHERSFILE ":%m");
+      return;
+    }
+
   while (fgets(buff, MAXDNAME, f))
     {
-      while (strlen(buff) > 0 && 
-	     (buff[strlen(buff)-1] == '\n' || 
-	      buff[strlen(buff)-1] == ' ' || 
-	      buff[strlen(buff)-1] == '\t'))
+      while (strlen(buff) > 0 && isspace(buff[strlen(buff)-1]))
 	buff[strlen(buff)-1] = 0;
       
       if ((*buff == '#') || (*buff == '+'))
 	continue;
       
-      for (ip = buff; *ip && *ip != ' '; ip++);
-      for(; *ip && *ip == ' '; ip++)
+      for (ip = buff; *ip && !isspace(*ip); ip++);
+      for(; *ip && isspace(*ip); ip++)
 	*ip = 0;
       if (!*ip)
 	continue;
@@ -464,6 +538,13 @@ struct dhcp_config *dhcp_read_ethers(struct dhcp_config *configs, char *buff)
       if (!sscanf(buff, "%x:%x:%x:%x:%x:%x", &e0, &e1, &e2, &e3, &e4, &e5))
 	continue;
       
+      hwaddr[0] = e0;
+      hwaddr[1] = e1;
+      hwaddr[2] = e2;
+      hwaddr[3] = e3;
+      hwaddr[4] = e4;
+      hwaddr[5] = e5;
+
       /* check for name or dotted-quad */
       for (cp = ip; *cp; cp++)
 	if (!(*cp == '.' || (*cp >='0' && *cp <= '9')))
@@ -471,35 +552,66 @@ struct dhcp_config *dhcp_read_ethers(struct dhcp_config *configs, char *buff)
       
       if (!*cp)
 	{
-	  name = NULL;
 	  if ((addr.s_addr = inet_addr(ip)) == (in_addr_t)-1)
-		continue;
+	    continue;
+	  flags = CONFIG_ADDR;
+	  
+	  for (config = configs; config; config = config->next)
+	    if ((config->flags & CONFIG_ADDR) && config->addr.s_addr == addr.s_addr)
+	      break;
 	}
       else 
 	{
-	  name = safe_string_alloc(ip);
-	  addr.s_addr = 0;
+	  if (!canonicalise(ip))
+	    continue;
+	  flags = CONFIG_NAME;
+
+	  for (config = configs; config; config = config->next)
+	    if ((config->flags & CONFIG_NAME) && hostname_isequal(config->hostname, ip))
+	      break;
 	}
       
-      new = safe_malloc(sizeof(struct dhcp_config));
-      new->clid_len = 0;
-      new->clid = NULL;
-      new->hwaddr[0] = e0;
-      new->hwaddr[1] = e1;
-      new->hwaddr[2] = e2;
-      new->hwaddr[3] = e3;
-      new->hwaddr[4] = e4;
-      new->hwaddr[5] = e5;
-      new->hostname = name;
-      new->addr = addr;
-      new->lease_time = 0;
-      new->next = configs;
+      if (!config)
+	{ 
+	  for (config = configs; config; config = config->next)
+	    if ((config->flags & CONFIG_HWADDR) && 
+		memcmp(config->hwaddr, hwaddr, ETHER_ADDR_LEN) == 0)
+	      break;
+	  
+	  if (!config)
+	    {
+	      if (!(config = malloc(sizeof(struct dhcp_config))))
+		continue;
+	      config->flags = 0;
+	      config->next = configs;
+	      configs = config;
+	    }
+	  
+	  config->flags |= flags;
+	  
+	  if (flags & CONFIG_NAME)
+	    {
+	      if ((config->hostname = malloc(strlen(ip)+1)))
+		strcpy(config->hostname, ip);
+	      else
+		config->flags &= ~CONFIG_NAME;
+	    }
+	  
+	  if (flags & CONFIG_ADDR)
+	    config->addr = addr;
+	}
       
-      configs = new;
+      config->flags |= CONFIG_HWADDR | CONFIG_NOCLID;
+      memcpy(config->hwaddr, hwaddr, ETHER_ADDR_LEN);
+
+      count++;
     }
   
   fclose(f);
-  return configs;
+
+  syslog(LOG_INFO, "read " ETHERSFILE " - %d addresses", count);
+  
+  daemon->dhcp_conf =  configs;
 }
 
 void dhcp_update_configs(struct dhcp_config *configs)
@@ -512,10 +624,13 @@ void dhcp_update_configs(struct dhcp_config *configs)
   struct crec *crec;
   
   for (config = configs; config; config = config->next)
-    if (config->addr.s_addr == 0 && config->hostname && 
+    if (!(config->flags & CONFIG_ADDR) &&
+	(config->flags & CONFIG_NAME) && 
 	(crec = cache_find_by_name(NULL, config->hostname, 0, F_IPV4)) &&
 	(crec->flags & F_HOSTS))
-      config->addr = crec->addr.addr.addr4;
-  
+      {
+	config->addr = crec->addr.addr.addr.addr4;
+	config->flags |= CONFIG_ADDR;
+      }
 }
 

src/dnsmasq.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2003 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2004 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -10,67 +10,28 @@
    GNU General Public License for more details.
 */
 
-/* See RFC1035 for details of the protocol this code talks. */
-
 /* Author's email: simon@thekelleys.org.uk */
 
 #include "dnsmasq.h"
 
-static int sigterm, sighup, sigusr1, sigalarm;
+static int sigterm, sighup, sigusr1, sigalarm, num_kids, in_child;
 
-static void sig_handler(int sig)
-{
-  if (sig == SIGTERM)
-    sigterm = 1;
-  else if (sig == SIGHUP)
-    sighup = 1;
-  else if (sig == SIGUSR1)
-    sigusr1 = 1;
-  else if (sig == SIGALRM)
-    sigalarm = 1;
-}
+static int set_dns_listeners(struct daemon *daemon, fd_set *set, int maxfd);
+static void check_dns_listeners(struct daemon *daemon, fd_set *set, time_t now);
+static void sig_handler(int sig);
 
 int main (int argc, char **argv)
 {
-  int cachesize = CACHESIZ;
-  int port = NAMESERVER_PORT;
-  int maxleases = MAXLEASES;
-  int query_port = 0;
+  struct daemon *daemon;
   int first_loop = 1;
-  unsigned long local_ttl = 0;
-  unsigned int options, min_leasetime;
-  char *runfile = RUNFILE;
+  int bind_fallback = 0;
   time_t resolv_changed = 0;
   time_t now, last = 0;
-  struct irec *interfaces = NULL;
-  struct listener *listener, *listeners;
-  char *mxname = NULL;
-  char *mxtarget = NULL;
-  char *lease_file = NULL;
-  char *addn_hosts = NULL;
-  char *domain_suffix = NULL;
-  char *username = CHUSER;
-  char *groupname = CHGRP;
-  struct iname *if_names = NULL;
-  struct iname *if_addrs = NULL;
-  struct iname *if_except = NULL;
-  struct server *serv_addrs = NULL;
-  char *dnamebuff, *packet;
-  int uptime_fd = -1;
-  struct server *servers, *last_server;
-  struct resolvc default_resolv = { NULL, 1, 0, RESOLVFILE };
-  struct resolvc *resolv = &default_resolv;
-  struct bogus_addr *bogus_addr = NULL;
-  struct serverfd *serverfdp, *sfds = NULL;
-  struct dhcp_context *dhcp_tmp, *dhcp = NULL;
-  struct dhcp_config *dhcp_configs = NULL;
-  struct dhcp_opt *dhcp_options = NULL;
-  char *dhcp_file = NULL, *dhcp_sname = NULL;
-  struct in_addr dhcp_next_server;
-  int leasefd = -1, dhcpfd = -1, dhcp_raw_fd = -1;
+  struct irec *interfaces;
   struct sigaction sigact;
   sigset_t sigmask;
-  
+  struct iname *if_tmp;
+
   sighup = 1; /* init cache the first time through */
   sigusr1 = 0; /* but don't dump */
   sigterm = 0; /* or die */
@@ -79,6 +40,8 @@ int main (int argc, char **argv)
 #else
   sigalarm = 0; /* or not */
 #endif
+  num_kids = 0;
+  in_child = 0;
  
   sigact.sa_handler = sig_handler;
   sigact.sa_flags = 0;
@@ -87,6 +50,11 @@ int main (int argc, char **argv)
   sigaction(SIGHUP, &sigact, NULL);
   sigaction(SIGTERM, &sigact, NULL);
   sigaction(SIGALRM, &sigact, NULL);
+  sigaction(SIGCHLD, &sigact, NULL);
+
+  /* ignore SIGPIPE */
+  sigact.sa_handler = SIG_IGN;
+  sigaction(SIGPIPE, &sigact, NULL);
 
   /* now block all the signals, they stay that way except
       during the call to pselect */
@@ -94,75 +62,118 @@ int main (int argc, char **argv)
   sigaddset(&sigact.sa_mask, SIGTERM);
   sigaddset(&sigact.sa_mask, SIGHUP);
   sigaddset(&sigact.sa_mask, SIGALRM);
+  sigaddset(&sigact.sa_mask, SIGCHLD);
   sigprocmask(SIG_BLOCK, &sigact.sa_mask, &sigmask); 
 
-  /* These get allocated here to avoid overflowing the small stack
-     on embedded systems. dnamebuff is big enough to hold one
-     maximal sixed domain name and gets passed into all the processing
-     code. We manage to get away with one buffer. */
-  dnamebuff = safe_malloc(MAXDNAME);
-  packet = safe_malloc(DNSMASQ_PACKETSZ);
+  daemon = read_opts(argc, argv);
   
-  dhcp_next_server.s_addr = 0;
-  options = read_opts(argc, argv, dnamebuff, &resolv, &mxname, &mxtarget, &lease_file,
-		      &username, &groupname, &domain_suffix, &runfile, 
-		      &if_names, &if_addrs, &if_except, &bogus_addr, 
-		      &serv_addrs, &cachesize, &port, &query_port, &local_ttl, &addn_hosts,
-		      &dhcp, &dhcp_configs, &dhcp_options,
-		      &dhcp_file, &dhcp_sname, &dhcp_next_server, &maxleases, &min_leasetime);
-
-  /* if we cannot support binding the wildcard address, set the "bind only
-     interfaces in use" option */
-#ifndef  HAVE_UDP_SRC_DST
-  options |= OPT_NOWILD;
-#endif
-
-  if (!lease_file)
-    lease_file = LEASEFILE;
-  else
+  if (daemon->edns_pktsz < PACKETSZ)
+    daemon->edns_pktsz = PACKETSZ;
+  daemon->packet = safe_malloc(daemon->edns_pktsz > DNSMASQ_PACKETSZ ? 
+			       daemon->edns_pktsz : DNSMASQ_PACKETSZ);
+  
+  if (!daemon->lease_file)
     {
-      if (!dhcp)
-	{
-	  complain("********* dhcp-lease option set, but not dhcp-range.", NULL);
-	  complain("********* Are you trying to use the obsolete ISC dhcpd integration?", NULL);
-	  complain("********* Please configure the dnsmasq integrated DHCP server by using", NULL);
-	  complain("********* the \"dhcp-range\" option, and remove any other DHCP server.", NULL);
-	}
+      if (daemon->dhcp)
+	daemon->lease_file = LEASEFILE;
+    }
+#ifndef HAVE_ISC_READER
+  else if (!daemon->dhcp)
+    die("ISC dhcpd integration not available: set HAVE_ISC_READER in src/config.h", NULL);
+#endif
+  
+  interfaces = enumerate_interfaces(daemon);
+    
+  if (!(daemon->options & OPT_NOWILD) && 
+      !(daemon->listeners = create_wildcard_listeners(daemon->port)))
+    {
+      bind_fallback = 1;
+      daemon->options |= OPT_NOWILD;
+    }
+    
+  if (daemon->options & OPT_NOWILD) 
+    {
+      daemon->listeners = create_bound_listeners(interfaces, daemon->port);
+
+      for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next)
+	if (if_tmp->name && !if_tmp->used)
+	  die("unknown interface %s", if_tmp->name);
+  
+      for (if_tmp = daemon->if_addrs; if_tmp; if_tmp = if_tmp->next)
+	if (!if_tmp->used)
+	  {
+	    char *addrbuff = daemon->namebuff;
+#ifdef HAVE_IPV6
+	    if (if_tmp->addr.sa.sa_family == AF_INET)
+	      inet_ntop(AF_INET, &if_tmp->addr.in.sin_addr,
+			addrbuff, ADDRSTRLEN);
+	    else
+	      inet_ntop(AF_INET6, &if_tmp->addr.in6.sin6_addr,
+			addrbuff, ADDRSTRLEN);
+#else
+	    strcpy(addrbuff, inet_ntoa(if_tmp->addr.in.sin_addr));
+#endif
+	    die("no interface with address %s", addrbuff);
+	  }
     }
   
-  interfaces = enumerate_interfaces(if_names, if_addrs, if_except, port);
-  if (options & OPT_NOWILD)
-    listeners = create_bound_listeners(interfaces);
-  else
-    listeners = create_wildcard_listeners(port);
-    
   forward_init(1);
-  cache_init(cachesize, options & OPT_LOG);
+  cache_init(daemon->cachesize, daemon->options & OPT_LOG);
 
 #ifdef HAVE_BROKEN_RTC
-  if ((uptime_fd = open(UPTIME, O_RDONLY)) == -1)
+  if ((daemon->uptime_fd = open(UPTIME, O_RDONLY)) == -1)
     die("cannot open " UPTIME ":%s", NULL);
 #endif
  
-  now = dnsmasq_time(uptime_fd);
+  now = dnsmasq_time(daemon->uptime_fd);
   
-  if (dhcp)
+  if (daemon->dhcp)
     {
-      dhcp_init(&dhcpfd, &dhcp_raw_fd);
-      leasefd = lease_init(lease_file, domain_suffix, dnamebuff, packet, now, maxleases);
-      if (options & OPT_ETHERS)
-	dhcp_configs = dhcp_read_ethers(dhcp_configs, dnamebuff);
-      dhcp_update_configs(dhcp_configs);
-      lease_update_from_configs(dhcp_configs, domain_suffix); /* must follow cache_init and lease_init */
-      lease_update_file(0, now); 
-      lease_update_dns();
+#if !defined(IP_PKTINFO) && !defined(IP_RECVIF)
+      int c;
+      struct iname *tmp;
+      for (c = 0, tmp = daemon->if_names; tmp; tmp = tmp->next)
+	if (!tmp->isloop)
+	  c++;
+      if (c != 1)
+	die("must set exactly one interface on broken systems without IP_RECVIF", NULL);
+#endif
+      dhcp_init(daemon);
+      lease_init(daemon, now);
+    }
+
+  /* If query_port is set then create a socket now, before dumping root
+     for use to access nameservers without more specific source addresses.
+     This allows query_port to be a low port */
+  if (daemon->query_port)
+    {
+      union  mysockaddr addr;
+      addr.in.sin_family = AF_INET;
+      addr.in.sin_addr.s_addr = INADDR_ANY;
+      addr.in.sin_port = htons(daemon->query_port);
+#ifdef HAVE_SOCKADDR_SA_LEN
+      addr.in.sin_len = sizeof(struct sockaddr_in);
+#endif
+      allocate_sfd(&addr, &daemon->sfds);
+#ifdef HAVE_IPV6
+      addr.in6.sin6_family = AF_INET6;
+      addr.in6.sin6_addr = in6addr_any;
+      addr.in6.sin6_port = htons(daemon->query_port);
+      addr.in6.sin6_flowinfo = htonl(0);
+#ifdef HAVE_SOCKADDR_SA_LEN
+      addr.in6.sin6_len = sizeof(struct sockaddr_in6);
+#endif
+      allocate_sfd(&addr, &daemon->sfds);
+#endif
     }
   
   setbuf(stdout, NULL);
 
-  if (!(options & OPT_DEBUG))
+  if (!(daemon->options & OPT_DEBUG))
     {
       FILE *pidfile;
+      struct serverfd *serverfdp;
+      struct listener *listener;
       struct passwd *ent_pw;
       int i;
         
@@ -170,20 +181,23 @@ int main (int argc, char **argv)
 	 See Stevens section 12.4 */
 
 #ifndef NO_FORK
-      if (fork() != 0 )
-	exit(0);
-      
-      setsid();
-      
-      if (fork() != 0)
-	exit(0);
+      if (!(daemon->options & OPT_NO_FORK))
+	{
+	  if (fork() != 0 )
+	    exit(0);
+	  
+	  setsid();
+	  
+	  if (fork() != 0)
+	    exit(0);
+	}
 #endif
       
       chdir("/");
       umask(022); /* make pidfile 0644 */
       
       /* write pidfile _after_ forking ! */
-      if (runfile && (pidfile = fopen(runfile, "w")))
+      if (daemon->runfile && (pidfile = fopen(daemon->runfile, "w")))
       	{
 	  fprintf(pidfile, "%d\n", (int) getpid());
 	  fclose(pidfile);
@@ -193,23 +207,35 @@ int main (int argc, char **argv)
 
       for (i=0; i<64; i++)
 	{
-	  for (listener = listeners; listener; listener = listener->next)
-	    if (listener->fd == i)
+	  for (listener = daemon->listeners; listener; listener = listener->next)
+	    if (listener->fd == i || listener->tcpfd == i)
 	      break;
 	  if (listener)
 	    continue;
 
-	  if (i == leasefd || 
-	      i == uptime_fd ||
-	      i == dhcpfd || 
-	      i == dhcp_raw_fd)
+#ifdef HAVE_BROKEN_RTC	  
+	  if (i == daemon->uptime_fd)
+	    continue;
+#endif
+
+	  if (daemon->dhcp && 
+	      (i == daemon->lease_fd || 
+	       i == daemon->dhcpfd || 
+	       i == daemon->dhcp_raw_fd ||
+	       i == daemon->dhcp_icmp_fd))
+	    continue;
+	  
+	  for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next)
+	    if (serverfdp->fd == i)
+	      break;
+	  if (serverfdp)
 	    continue;
 
 	  close(i);
 	}
 
       /* Change uid and gid for security */
-      if (username && (ent_pw = getpwnam(username)))
+      if (daemon->username && (ent_pw = getpwnam(daemon->username)))
 	{
 	  gid_t dummy;
 	  struct group *gp;
@@ -217,7 +243,7 @@ int main (int argc, char **argv)
 	  setgroups(0, &dummy);
 	  /* change group for /etc/ppp/resolv.conf 
 	     otherwise get the group for "nobody" */
-	  if ((groupname && (gp = getgrnam(groupname))) || 
+	  if ((daemon->groupname && (gp = getgrnam(daemon->groupname))) || 
 	      (gp = getgrgid(ent_pw->pw_gid)))
 	    setgid(gp->gr_gid); 
 	  /* finally drop root */
@@ -226,40 +252,57 @@ int main (int argc, char **argv)
     }
 
   openlog("dnsmasq", 
-	  DNSMASQ_LOG_OPT(options & OPT_DEBUG), 
-	  DNSMASQ_LOG_FAC(options & OPT_DEBUG));
+	  DNSMASQ_LOG_OPT(daemon->options & OPT_DEBUG), 
+	  DNSMASQ_LOG_FAC(daemon->options & OPT_DEBUG));
   
-  if (cachesize)
-    syslog(LOG_INFO, "started, version %s cachesize %d", VERSION, cachesize);
+  if (daemon->cachesize != 0)
+    syslog(LOG_INFO, "started, version %s cachesize %d", VERSION, daemon->cachesize);
   else
     syslog(LOG_INFO, "started, version %s cache disabled", VERSION);
   
-  if (options & OPT_LOCALMX)
-    syslog(LOG_INFO, "serving MX record for local hosts target %s", mxtarget);
-  else if (mxname)
-    syslog(LOG_INFO, "serving MX record for mailhost %s target %s", 
-	   mxname, mxtarget);
-
-  for (dhcp_tmp = dhcp; dhcp_tmp; dhcp_tmp = dhcp_tmp->next)
+  if (bind_fallback)
+    syslog(LOG_WARNING, "setting --bind-interfaces option because of OS limitations");
+  
+  if (!(daemon->options & OPT_NOWILD)) 
+    for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next)
+      if (if_tmp->name && !if_tmp->used)
+	syslog(LOG_WARNING, "warning: interface %s does not currently exist", if_tmp->name);
+  
+  if (daemon->dhcp)
     {
-      strcpy(dnamebuff, inet_ntoa(dhcp_tmp->start));
-      if (dhcp_tmp->lease_time == 0)
-	sprintf(packet, "infinite");
-      else
-	sprintf(packet, "%ds", (int)dhcp_tmp->lease_time);
-      syslog(LOG_INFO, "DHCP, IP range %s -- %s, lease time %s", 
-	     dnamebuff, inet_ntoa(dhcp_tmp->end), packet);
+      struct dhcp_context *dhcp_tmp;
+      for (dhcp_tmp = daemon->dhcp; dhcp_tmp; dhcp_tmp = dhcp_tmp->next)
+	{
+	  char *time = daemon->dhcp_buff2;
+	  strcpy(daemon->dhcp_buff, inet_ntoa(dhcp_tmp->start));
+	  if (dhcp_tmp->lease_time == 0)
+	    sprintf(time, "infinite");
+	  else
+	    {
+	      unsigned int x, p = 0, t = (unsigned int)dhcp_tmp->lease_time;
+	      if ((x = t/3600))
+		p += sprintf(&time[p], "%dh", x);
+	      if ((x = (t/60)%60))
+		p += sprintf(&time[p], "%dm", x);
+	      if ((x = t%60))
+		p += sprintf(&time[p], "%ds", x);
+	    }
+	  syslog(LOG_INFO, 
+		 dhcp_tmp->static_only ? 
+		 "DHCP, static leases only on %.0s%s, lease time %s" :
+		 "DHCP, IP range %s -- %s, lease time %s",
+		 daemon->dhcp_buff, inet_ntoa(dhcp_tmp->end), time);
+	}
+ 
+#ifdef HAVE_BROKEN_RTC
+      syslog(LOG_INFO, "DHCP, %s will be written every %ds", daemon->lease_file, daemon->min_leasetime/3);
+#endif
     }
 
-#ifdef HAVE_BROKEN_RTC
-  if (dhcp)
-    syslog(LOG_INFO, "DHCP, %s will be written every %ds", lease_file, min_leasetime/3);
-#endif
-
-  if (getuid() == 0 || geteuid() == 0)
-    syslog(LOG_WARNING, "failed to drop root privs");
+  if (!(daemon->options & OPT_DEBUG) && (getuid() == 0 || geteuid() == 0))
+    syslog(LOG_WARNING, "running as root");
   
-  servers = last_server = check_servers(serv_addrs, interfaces, &sfds);
+  check_servers(daemon, interfaces);
   
   while (sigterm == 0)
     {
@@ -267,34 +310,37 @@ int main (int argc, char **argv)
       
       if (sighup)
 	{
-	  cache_reload(options, dnamebuff, domain_suffix, addn_hosts);
-	  if (dhcp)
+	  cache_reload(daemon->options, daemon->namebuff, daemon->domain_suffix, daemon->addn_hosts);
+	  if (daemon->dhcp)
 	    {
-	      dhcp_update_configs(dhcp_configs);
-	      lease_update_from_configs(dhcp_configs, domain_suffix); 
+	      if (daemon->options & OPT_ETHERS)
+		dhcp_read_ethers(daemon);
+	      dhcp_update_configs(daemon->dhcp_conf);
+	      lease_update_from_configs(daemon->dhcp_conf, daemon->domain_suffix); 
 	      lease_update_file(0, now); 
-	      lease_update_dns();
+	      lease_update_dns(daemon);
+	    }
+	  if (daemon->resolv_files && (daemon->options & OPT_NO_POLL))
+	    {
+	      reload_servers(daemon->resolv_files->name, daemon);
+	      check_servers(daemon, interfaces);
 	    }
-	  if (resolv && (options & OPT_NO_POLL))
-	    servers = last_server = 
-	      check_servers(reload_servers(resolv->name, dnamebuff, servers, query_port), 
-			    interfaces, &sfds);
 	  sighup = 0;
 	}
       
       if (sigusr1)
 	{
-	  dump_cache(options & (OPT_DEBUG | OPT_LOG), cachesize);
+	  dump_cache(daemon);
 	  sigusr1 = 0;
 	}
       
       if (sigalarm)
 	{
-	  if (dhcp)
+	  if (daemon->dhcp)
 	    {
 	      lease_update_file(1, now);
 #ifdef HAVE_BROKEN_RTC
-	      alarm(min_leasetime/3);
+	      alarm(daemon->min_leasetime/3);
 #endif
 	    } 
 	  sigalarm  = 0;
@@ -304,27 +350,13 @@ int main (int argc, char **argv)
       
       if (!first_loop)
 	{
-	  int maxfd = 0;
-	  
-	  for (serverfdp = sfds; serverfdp; serverfdp = serverfdp->next)
+	  int maxfd = set_dns_listeners(daemon, &rset, 0);
+	  	  
+	  if (daemon->dhcp)
 	    {
-	      FD_SET(serverfdp->fd, &rset);
-	      if (serverfdp->fd > maxfd)
-		maxfd = serverfdp->fd;
-	    }
-	  
-	  for (listener = listeners; listener; listener = listener->next)
-	    {
-	      FD_SET(listener->fd, &rset);
-	      if (listener->fd > maxfd)
-		maxfd = listener->fd;
-	    }
-	  
-	  if (dhcp)
-	    {
-	      FD_SET(dhcpfd, &rset);
-	      if (dhcpfd > maxfd)
-		maxfd = dhcpfd;
+	      FD_SET(daemon->dhcpfd, &rset);
+	      if (daemon->dhcpfd > maxfd)
+		maxfd = daemon->dhcpfd;
 	    }
 
 #ifdef HAVE_PSELECT
@@ -339,21 +371,26 @@ int main (int argc, char **argv)
 	    sigprocmask(SIG_SETMASK, &save_mask, NULL);
 	  }
 #endif
-	  
 	}
 
       first_loop = 0;
-      now = dnsmasq_time(uptime_fd);
+      now = dnsmasq_time(daemon->uptime_fd);
 
       /* Check for changes to resolv files once per second max. */
       if (last == 0 || difftime(now, last) > 1.0)
 	{
 	  last = now;
-	  if (!(options & OPT_NO_POLL))
+
+#ifdef HAVE_ISC_READER
+	  if (daemon->lease_file && !daemon->dhcp)
+	    load_dhcp(daemon, now);
+#endif
+
+	  if (!(daemon->options & OPT_NO_POLL))
 	    {
-	      struct resolvc *res = resolv, *latest = NULL;
-	      time_t last_change = 0;
+	      struct resolvc *res = daemon->resolv_files, *latest = NULL;
 	      struct stat statbuf;
+	      time_t last_change = 0;
 	      /* There may be more than one possible file. 
 		 Go through and find the one which changed _last_.
 		 Warn of any which can't be read. */
@@ -368,7 +405,7 @@ int main (int argc, char **argv)
 		  else
 		    {
 		      res->logged = 0;
-		      if (statbuf.st_mtime > last_change)
+		      if (difftime(statbuf.st_mtime, last_change) > 0.0)
 			{
 			  last_change = statbuf.st_mtime;
 			  latest = res;
@@ -377,48 +414,273 @@ int main (int argc, char **argv)
 		  res = res->next;
 		}
 	  
-	      if (latest && last_change > resolv_changed)
+	      if (latest && difftime(last_change, resolv_changed) > 0.0)
 		{
 		  resolv_changed = last_change;
-		  servers = last_server = 
-		    check_servers(reload_servers(latest->name, dnamebuff, servers, query_port),
-				  interfaces, &sfds);
+		  reload_servers(latest->name, daemon);
+		  check_servers(daemon, interfaces);
 		}
 	    }
 	}
 		
-      for (serverfdp = sfds; serverfdp; serverfdp = serverfdp->next)
-	if (FD_ISSET(serverfdp->fd, &rset))
-	  last_server = reply_query(serverfdp->fd, options, packet, now, 
-				    dnamebuff, last_server, bogus_addr);
-
-      if (dhcp && FD_ISSET(dhcpfd, &rset))
-	dhcp_packet(dhcp, packet, dhcp_options, dhcp_configs,
-		    now, dnamebuff, domain_suffix, dhcp_file,
-		    dhcp_sname, dhcp_next_server, dhcpfd, dhcp_raw_fd,
-		    if_names, if_addrs, if_except);
+      check_dns_listeners(daemon, &rset, now);
       
-      for (listener = listeners; listener; listener = listener->next)
-	if (FD_ISSET(listener->fd, &rset))
-	  last_server = receive_query(listener, packet,
-			mxname, mxtarget, options, now, local_ttl, dnamebuff,
-			if_names, if_addrs, if_except, last_server, servers);
+      if (daemon->dhcp && FD_ISSET(daemon->dhcpfd, &rset))
+	dhcp_packet(daemon, now);
     }
   
   syslog(LOG_INFO, "exiting on receipt of SIGTERM");
 
+  if (daemon->dhcp)
+    { 
 #ifdef HAVE_BROKEN_RTC
-  if (dhcp)
-    lease_update_file(1, now);
+      lease_update_file(1, now);
 #endif
-
-  if (leasefd != -1)
-    close(leasefd);
+      close(daemon->lease_fd);
+    }
+  
   return 0;
 }
 
+static void sig_handler(int sig)
+{
+  if (sig == SIGTERM)
+    sigterm = 1;
+  else if (sig == SIGHUP)
+    sighup = 1;
+  else if (sig == SIGUSR1)
+    sigusr1 = 1;
+  else if (sig == SIGALRM)
+    {
+      /* alarm is used to kill children after a fixed time. */
+      if (in_child)
+	exit(0);
+      else
+	sigalarm = 1;
+    }
+  else if (sig == SIGCHLD)
+    {
+      /* See Stevens 5.10 */
+      
+      while (waitpid(-1, NULL, WNOHANG) > 0)
+	num_kids--;
+    }
+}
 
+static int set_dns_listeners(struct daemon *daemon, fd_set *set, int maxfd)
+{
+  struct serverfd *serverfdp;
+  struct listener *listener;
 
+  for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next)
+    {
+      FD_SET(serverfdp->fd, set);
+      if (serverfdp->fd > maxfd)
+	maxfd = serverfdp->fd;
+    }
+	  
+  for (listener = daemon->listeners; listener; listener = listener->next)
+    {
+      FD_SET(listener->fd, set);
+      if (listener->fd > maxfd)
+	maxfd = listener->fd;
+      FD_SET(listener->tcpfd, set);
+      if (listener->tcpfd > maxfd)
+	maxfd = listener->tcpfd;
+    }
 
+  return maxfd;
+}
 
+static void check_dns_listeners(struct daemon *daemon, fd_set *set, time_t now)
+{
+  struct serverfd *serverfdp;
+  struct listener *listener;	  
 
+   for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next)
+     if (FD_ISSET(serverfdp->fd, set))
+       reply_query(serverfdp, daemon, now);
+
+   for (listener = daemon->listeners; listener; listener = listener->next)
+     {
+       if (FD_ISSET(listener->fd, set))
+	 receive_query(listener, daemon, now);
+       
+       if (FD_ISSET(listener->tcpfd, set))
+	 {
+	   int confd;
+	   
+	   while((confd = accept(listener->tcpfd, NULL, NULL)) == -1 && errno == EINTR);
+	      
+	   if (confd != -1)
+	     {
+	       int match = 1;
+	       if (!(daemon->options & OPT_NOWILD)) 
+		 {
+		   /* Check for allowed interfaces when binding the wildcard address */
+		   /* Don't know how to get interface of a connection, so we have to
+		      check by address. This will break when interfaces change address */
+		   union mysockaddr tcp_addr;
+		   socklen_t tcp_len = sizeof(union mysockaddr);
+		   struct iname *tmp;
+		   
+		   if (getsockname(confd, (struct sockaddr *)&tcp_addr, &tcp_len) != -1)
+		     {
+#ifdef HAVE_IPV6
+		       if (tcp_addr.sa.sa_family == AF_INET6)
+			 tcp_addr.in6.sin6_flowinfo =  htonl(0);
+#endif
+		       for (match = 1, tmp = daemon->if_except; tmp; tmp = tmp->next)
+			 if (sockaddr_isequal(&tmp->addr, &tcp_addr))
+			   match = 0;
+		       
+		       if (match && (daemon->if_names || daemon->if_addrs))
+			 {
+			   match = 0;
+			   for (tmp = daemon->if_names; tmp; tmp = tmp->next)
+			     if (sockaddr_isequal(&tmp->addr, &tcp_addr))
+			       match = 1;
+			   for (tmp = daemon->if_addrs; tmp; tmp = tmp->next)
+			     if (sockaddr_isequal(&tmp->addr, &tcp_addr))
+			       match = 1;  
+			 }
+		     }
+		 }			  
+	       
+	       if (!match || (num_kids >= MAX_PROCS))
+		 close(confd);
+	       else if (!(daemon->options & OPT_DEBUG) && fork())
+		 {
+		   num_kids++;
+		   close(confd);
+		 }
+	       else
+		 {
+		   char *buff;
+		   struct server *s; 
+		   int flags;
+		   
+		   /* Arrange for SIGALARM after CHILD_LIFETIME seconds to
+		      terminate the process. */
+		   if (!(daemon->options & OPT_DEBUG))
+		     {
+		       sigset_t mask;
+		       sigemptyset(&mask);
+		       sigaddset(&mask, SIGALRM);
+		       sigprocmask(SIG_UNBLOCK, &mask, NULL);
+		       alarm(CHILD_LIFETIME);
+		       in_child = 1;
+		     }
+		   
+		   /* start with no upstream connections. */
+		   for (s = daemon->servers; s; s = s->next)
+		     s->tcpfd = -1; 
+		   
+		   /* The connected socket inherits non-blocking
+		      attribute from the listening socket. 
+		      Reset that here. */
+		   if ((flags = fcntl(confd, F_GETFL, 0)) != -1)
+		     fcntl(confd, F_SETFL, flags & ~O_NONBLOCK);
+		   
+		   buff = tcp_request(daemon, confd, now);
+		   
+		   if (!(daemon->options & OPT_DEBUG))
+		     exit(0);
+		      
+		   close(confd);
+		   if (buff)
+		     free(buff);
+		   for (s = daemon->servers; s; s = s->next)
+		     if (s->tcpfd != -1)
+		       close(s->tcpfd);
+		 }
+	     }
+	 }
+     }
+}
+
+int icmp_ping(struct daemon *daemon, struct in_addr addr)
+{
+  /* Try and get an ICMP echo from a machine.
+     Note that we can't create the raw socket each time
+     we do this, since that needs root. Therefore the socket has to hang
+     around all the time. Since most of the time we won't read the 
+     socket, it will accumulate buffers full of ICMP messages,
+     wasting memory. To avoid that we set the receive buffer
+     length to zero except when we're actively pinging. */
+
+  /* Note that whilst in the three second wait, we check for 
+     (and service) events on the DNS sockets, (so doing that
+     better not use any resources our caller has in use...)
+     but we remain deaf to signals or further DHCP packets. */
+
+  struct sockaddr_in saddr;
+  struct { 
+    struct ip ip;
+    struct icmp icmp;
+  } packet;
+  unsigned short id = rand16();
+  unsigned int i, j;
+  int opt = 2000, gotreply = 0;
+  time_t start, now;
+  
+  saddr.sin_family = AF_INET;
+  saddr.sin_port = 0;
+  saddr.sin_addr = addr;
+#ifdef HAVE_SOCKADDR_SA_LEN
+  saddr.sin_len = sizeof(struct sockaddr_in);
+#endif
+  
+  memset(&packet.icmp, 0, sizeof(packet.icmp));
+  packet.icmp.icmp_type = ICMP_ECHO;
+  packet.icmp.icmp_id = id;
+  for (j = 0, i = 0; i < sizeof(struct icmp) / 2; i++)
+    j += ((u16 *)&packet.icmp)[i];
+  while (j>>16)
+    j = (j & 0xffff) + (j >> 16);  
+  packet.icmp.icmp_cksum = (j == 0xffff) ? j : ~j;
+  
+  setsockopt(daemon->dhcp_icmp_fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt));
+
+  while (sendto(daemon->dhcp_icmp_fd, (char *)&packet.icmp, sizeof(struct icmp), 0, 
+		(struct sockaddr *)&saddr, sizeof(saddr)) == -1 &&
+	 retry_send());
+  
+  for (now = start = dnsmasq_time(daemon->uptime_fd); difftime(now, start) < 3.0;)
+    {
+      struct timeval tv;
+      fd_set rset;
+      struct sockaddr_in faddr;
+      int maxfd, len = sizeof(faddr);
+      
+      tv.tv_usec = 250000;
+      tv.tv_sec = 0; 
+      
+      FD_ZERO(&rset);
+      FD_SET(daemon->dhcp_icmp_fd, &rset);
+      maxfd = set_dns_listeners(daemon, &rset, daemon->dhcp_icmp_fd);
+		
+      if (select(maxfd+1, &rset, NULL, NULL, &tv) < 0)
+	FD_ZERO(&rset);
+      
+      now = dnsmasq_time(daemon->uptime_fd);
+      check_dns_listeners(daemon, &rset, now);
+      
+      if (FD_ISSET(daemon->dhcp_icmp_fd, &rset) &&
+	  recvfrom(daemon->dhcp_icmp_fd, &packet, sizeof(packet), 0,
+		   (struct sockaddr *)&faddr, &len) == sizeof(packet) &&
+	  saddr.sin_addr.s_addr == faddr.sin_addr.s_addr &&
+	  packet.icmp.icmp_type == ICMP_ECHOREPLY &&
+	  packet.icmp.icmp_seq == 0 &&
+	  packet.icmp.icmp_id == id)
+	{
+	  gotreply = 1;
+	  break;
+	}
+    }
+  
+  opt = 1;
+  setsockopt(daemon->dhcp_icmp_fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt));
+  
+  return gotreply;
+}

src/dnsmasq.h

@@ -11,7 +11,8 @@
 */
 
 /* Author's email: simon@thekelleys.org.uk */
- 
+
+#define COPYRIGHT "Copyright (C) 2000-2004 Simon Kelley" 
 
 #ifdef __linux__
 /* for pselect.... */
@@ -26,20 +27,21 @@
 
 /* get this before config.h too. */
 #include <syslog.h>
+#include <arpa/nameser.h>
 
 #include "config.h"
  
-#include <arpa/nameser.h>
 #include <arpa/inet.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
-#include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <sys/select.h>
+#include <sys/wait.h>
 #if defined(__sun) || defined(__sun__)
 #  include <sys/sockio.h>
 #endif
 #include <sys/time.h>
+#include <limits.h>
 #include <net/if.h>
 #include <unistd.h>
 #include <stdio.h>
@@ -55,7 +57,7 @@
 #include <errno.h>
 #include <pwd.h>
 #include <grp.h>
-#if defined(__OpenBSD__)
+#if defined(__OpenBSD__) || defined(__NetBSD__)
 #  include <netinet/if_ether.h>
 #else
 #  include <net/ethernet.h>
@@ -63,6 +65,7 @@
 #include <net/if_arp.h>
 #include <netinet/in_systm.h>
 #include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
 #ifdef HAVE_BPF
 #  include <net/bpf.h>
 #  include <net/if_dl.h>
@@ -90,6 +93,9 @@
 #define OPT_NODOTS_LOCAL   4096
 #define OPT_NOWILD         8192
 #define OPT_ETHERS         16384
+#define OPT_RESOLV_DOMAIN  32768
+#define OPT_NO_FORK        65536
+#define OPT_AUTHORITATIVE  131072
 
 struct all_addr {
   union {
@@ -105,6 +111,17 @@ struct bogus_addr {
   struct bogus_addr *next;
 };
 
+/* dns doctor param */
+struct doctor {
+  struct in_addr in, out, mask;
+  struct doctor *next;
+};
+
+struct mx_record {
+  char *mxname, *mxtarget;
+  struct mx_record *next;
+};
+
 union bigname {
   char name[MAXDNAME];
   union bigname *next; /* freelist */
@@ -113,7 +130,14 @@ union bigname {
 struct crec { 
   struct crec *next, *prev, *hash_next;
   time_t ttd; /* time to die */
-  struct all_addr addr;
+  int uid; 
+  union {
+    struct all_addr addr;
+    struct {
+      struct crec *cache;
+      int uid;
+    } cname;
+  } addr;
   unsigned short flags;
   union {
     char sname[SMALLDNAME];
@@ -136,7 +160,7 @@ struct crec {
 #define F_SERVER    2048
 #define F_NXDOMAIN  4096
 #define F_QUERY     8192
-#define F_ADDN      16384
+#define F_CNAME     16384
 #define F_NOERR     32768
 
 /* struct sockaddr is not large enough to hold any address,
@@ -181,7 +205,7 @@ struct server {
   struct serverfd *sfd; /* non-NULL if this server has its own fd bound to
 			   a source port */
   char *domain; /* set if this server only handles a domain. */ 
-  int flags;
+  int flags, tcpfd;
   struct server *next; 
 };
 
@@ -191,7 +215,7 @@ struct irec {
 };
 
 struct listener {
-  int fd, family;
+  int fd, tcpfd, family;
   struct listener *next;
 };
 
@@ -199,6 +223,7 @@ struct listener {
 struct iname {
   char *name;
   union mysockaddr addr;
+  int isloop, used;
   struct iname *next;
 };
 
@@ -210,12 +235,21 @@ struct resolvc {
   char *name;
 };
 
+/* adn-hosts parms from command-line */
+struct hostsfile {
+  struct hostsfile *next;
+  char *fname;
+  int index; /* matches to cache entries fro logging */
+};
+
 struct frec {
   union mysockaddr source;
   struct all_addr dest;
   struct server *sentto;
+  unsigned int iface;
   unsigned short orig_id, new_id;
   int fd;
+  unsigned int crc;
   time_t time;
   struct frec *next;
 };
@@ -230,29 +264,64 @@ struct dhcp_lease {
   struct dhcp_lease *next;
 };
 
+struct dhcp_netid {
+  char *net;
+  struct dhcp_netid *next;
+};
+
+struct dhcp_netid_list {
+  struct dhcp_netid *list;
+  struct dhcp_netid_list *next;
+};
 struct dhcp_config {
+  unsigned int flags;
   int clid_len;          /* length of client identifier */
   unsigned char *clid;   /* clientid */
   unsigned char hwaddr[ETHER_ADDR_LEN]; 
   char *hostname;
+  struct dhcp_netid netid;
   struct in_addr addr;
   unsigned int lease_time;
   struct dhcp_config *next;
 };
 
+#define CONFIG_DISABLE   1
+#define CONFIG_CLID      2
+#define CONFIG_HWADDR    4
+#define CONFIG_TIME      8
+#define CONFIG_NAME     16
+#define CONFIG_ADDR     32
+#define CONFIG_NETID    64
+#define CONFIG_NOCLID  128
+
 struct dhcp_opt {
   int opt, len, is_addr;
   unsigned char *val;
-  char *netid;
+  struct dhcp_netid *netid;
   struct dhcp_opt *next;
- };
+};
+
+struct dhcp_boot {
+  char *file, *sname;
+  struct in_addr next_server;
+  struct dhcp_netid *netid;
+  struct dhcp_boot *next;
+};
+
+struct dhcp_vendor {
+  int len, is_vendor;
+  char *data;
+  struct dhcp_netid netid;
+  struct dhcp_vendor *next;
+};
 
 struct dhcp_context {
-  unsigned int lease_time;
-  struct in_addr netmask, broadcast;
-  struct in_addr start, end, last; /* range of available addresses */
-  char *netid;
-  struct dhcp_context *next;
+  unsigned int lease_time, addr_epoch;
+  struct in_addr netmask, broadcast, router;
+  struct in_addr start, end; /* range of available addresses */
+  int static_only;
+  struct dhcp_netid netid;
+  struct dhcp_context *next, *current;
 };
 
 typedef unsigned char u8;
@@ -274,15 +343,60 @@ struct udp_dhcp_packet {
 	  u16 secs, flags;
 	  struct in_addr ciaddr, yiaddr, siaddr, giaddr;
 	  u8 chaddr[16], sname[64], file[128];
-	  u32 cookie;
-	  u8 options[308];
+	  u8 options[312];
 	} data;
 };
 
 
+struct daemon {
+  /* datastuctures representing the command-line and 
+     config file arguments. All set (including defaults)
+     in option.c */
+
+  unsigned int options;
+  struct resolvc default_resolv, *resolv_files;
+  struct mx_record *mxnames;
+  char *mxtarget;
+  char *lease_file; 
+  char *username, *groupname;
+  char *domain_suffix;
+  char *runfile; 
+  struct iname *if_names, *if_addrs, *if_except;
+  struct bogus_addr *bogus_addr;
+  struct server *servers;
+  int cachesize;
+  int port, query_port;
+  unsigned long local_ttl;
+  struct hostsfile *addn_hosts;
+  struct dhcp_context *dhcp;
+  struct dhcp_config *dhcp_conf;
+  struct dhcp_opt *dhcp_opts;
+  struct dhcp_vendor *dhcp_vendors;
+  struct dhcp_boot *boot_config;
+  struct dhcp_netid_list *dhcp_ignore;
+  int dhcp_max; 
+  unsigned int min_leasetime;
+  struct doctor *doctors;
+  unsigned short edns_pktsz;
+
+  /* globally used stuff for DNS */
+  char *packet; /* packet buffer */
+  char *namebuff; /* MAXDNAME size buffer */
+  struct serverfd *sfds;
+  struct listener *listeners;
+  struct server *last_server;
+  int uptime_fd;
+  
+  /* DHCP state */
+  int dhcpfd, dhcp_raw_fd, dhcp_icmp_fd, lease_fd;
+  struct udp_dhcp_packet *dhcp_packet;
+  char *dhcp_buff, *dhcp_buff2;
+};
+
 /* cache.c */
 void cache_init(int cachesize, int log);
-void log_query(unsigned short flags, char *name, struct all_addr *addr);
+void log_query(unsigned short flags, char *name, struct all_addr *addr, 
+	       unsigned short type, struct hostsfile *addn_hosts, int index);
 struct crec *cache_find_by_addr(struct crec *crecp,
 				struct all_addr *addr, time_t now, 
 				unsigned short prot);
@@ -290,32 +404,37 @@ struct crec *cache_find_by_name(struct crec *crecp,
 				char *name, time_t now, unsigned short  prot);
 void cache_end_insert(void);
 void cache_start_insert(void);
-void cache_insert(char *name, struct all_addr *addr,
-		  time_t now, unsigned long ttl, unsigned short flags);
-void cache_reload(int opts, char *buff, char *domain_suffix, char *addn_hosts);
-void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, 
-			  time_t ttd, unsigned short flags);
+struct crec *cache_insert(char *name, struct all_addr *addr,
+			  time_t now, unsigned long ttl, unsigned short flags);
+void cache_reload(int opts, char *buff, char *domain_suffix, struct hostsfile  *addn_hosts);
+void cache_add_dhcp_entry(struct daemon *daemon, char *host_name, struct in_addr *host_address, time_t ttd);
 void cache_unhash_dhcp(void);
-void dump_cache(int debug, int size);
+void dump_cache(struct daemon *daemon);
 char *cache_get_name(struct crec *crecp);
 
 /* rfc1035.c */
-unsigned short extract_request(HEADER *header, unsigned int qlen, char *name);
+unsigned short extract_request(HEADER *header, unsigned int qlen, 
+			       char *name, unsigned short *typep);
 int setup_reply(HEADER *header, unsigned int qlen,
 		struct all_addr *addrp, unsigned short flags,
 		unsigned long local_ttl);
-void extract_addresses(HEADER *header, unsigned int qlen, char *namebuff, time_t now);
-void extract_neg_addrs(HEADER *header, unsigned int qlen, char *namebuff, time_t now);
-int answer_request(HEADER *header, char *limit, unsigned int qlen, char *mxname, 
-		   char *mxtarget, unsigned int options, time_t now, unsigned long local_ttl,
-		   char *namebuff);
+void extract_addresses(HEADER *header, unsigned int qlen, char *namebuff, 
+		       time_t now, struct daemon *daemon);
+int answer_request(HEADER *header, char *limit, unsigned int qlen, struct daemon *daemon, time_t now);
 int check_for_bogus_wildcard(HEADER *header, unsigned int qlen, char *name, 
 			     struct bogus_addr *addr, time_t now);
+unsigned char *find_pseudoheader(HEADER *header, unsigned int plen,
+				 unsigned int *len, unsigned char **p);
+int check_for_local_domain(char *name, time_t now, struct mx_record *mx);
+unsigned int questions_crc(HEADER *header, unsigned int plen);
+int resize_packet(HEADER *header, unsigned int plen, 
+		  unsigned char *pheader, unsigned int hlen);
 
 /* util.c */
 unsigned short rand16(void);
 int legal_char(char c);
 int canonicalise(char *s);
+int atoi_check(char *a, int *res);
 void die(char *message, char *arg1);
 void complain(char *message, char *arg1);
 void *safe_malloc(int size);
@@ -324,61 +443,45 @@ int sa_len(union mysockaddr *addr);
 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 int hostname_isequal(unsigned char *a, unsigned char *b);
 time_t dnsmasq_time(int fd);
+int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
+int retry_send(void);
+
 /* option.c */
-unsigned int read_opts(int argc, char **argv, char *buff, struct resolvc **resolv_file, 
-		       char **mxname, char **mxtarget, char **lease_file, 
-		       char **username, char **groupname, 
-		       char **domain_suffix, char **runfile, 
-		       struct iname **if_names, struct iname **if_addrs, struct iname **if_except, 
-		       struct bogus_addr **bogus_addr, struct server **serv_addrs, int *cachesize, 
-		       int *port, int *query_port, unsigned long *local_ttl, char **addn_hosts,
-		       struct dhcp_context **dhcp, struct dhcp_config **dhcp_conf, struct dhcp_opt **opts,
-		       char **dhcp_file, char **dhcp_sname, struct in_addr *dhcp_next_server,
-		       int *maxleases, unsigned int *min_leasetime);
+struct daemon *read_opts (int argc, char **argv);
 
 /* forward.c */
 void forward_init(int first);
-struct server *reply_query(int fd, int options, char *packet, time_t now,
-			   char *dnamebuff, struct server *last_server, 
-			   struct bogus_addr *bogus_nxdomain);
+void reply_query(struct serverfd *sfd, struct daemon *daemon, time_t now);
+void receive_query(struct listener *listen, struct daemon *daemon, time_t now);
+char *tcp_request(struct daemon *daemon, int confd, time_t now);
 
-struct server *receive_query(struct listener *listen, char *packet, char *mxname, 
-			     char *mxtarget, unsigned int options, time_t now, 
-			     unsigned long local_ttl, char *namebuff,
-			     struct iname *names, struct iname *addrs, struct iname *except,
-			     struct server *last_server, struct server *servers);
 /* network.c */
-struct server *reload_servers(char *fname, char *buff, struct server *servers, int query_port);
-struct server *check_servers(struct server *new, struct irec *interfaces, struct serverfd **sfds);
-struct irec *enumerate_interfaces(struct iname *names,
-				  struct iname *addrs,
-				  struct iname *except,
-				  int port);
+struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds);
+void reload_servers(char *fname, struct daemon *daemon);
+void check_servers(struct daemon *daemon, struct irec *interfaces);
+struct irec *enumerate_interfaces(struct daemon *daemon);
 struct listener *create_wildcard_listeners(int port);
-struct listener *create_bound_listeners(struct irec *interfaces);
+struct listener *create_bound_listeners(struct irec *interfaces, int port);
+
 /* dhcp.c */
-void dhcp_init(int *fdp, int* rfdp);
-void dhcp_packet(struct dhcp_context *contexts, char *packet, 
-		 struct dhcp_opt *dhcp_opts, struct dhcp_config *dhcp_configs, 
-		 time_t now, char *namebuff, char *domain_suffix,
-		 char *dhcp_file, char *dhcp_sname, 
-		 struct in_addr dhcp_next_server, int dhcp_fd, int raw_fd,
-		 struct iname *names, struct iname *addrs, struct iname *except);
+void dhcp_init(struct daemon *daemon);
+void dhcp_packet(struct daemon *daemon, time_t now);
+
 int address_available(struct dhcp_context *context, struct in_addr addr);
-int address_allocate(struct dhcp_context *context, struct dhcp_config *configs,
-		     struct in_addr *addrp);
+int address_allocate(struct dhcp_context *context, struct daemon *daemon,
+		     struct in_addr *addrp, unsigned char *hwaddr);
 struct dhcp_config *find_config(struct dhcp_config *configs,
 				struct dhcp_context *context,
 				unsigned char *clid, int clid_len,
 				unsigned char *hwaddr, char *hostname);
-struct dhcp_config *read_ethers(struct dhcp_config *configs, char *buff);
 void dhcp_update_configs(struct dhcp_config *configs);
-struct dhcp_config *dhcp_read_ethers(struct dhcp_config *configs, char *buff);
+void dhcp_read_ethers(struct daemon *daemon);
+struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
+
 /* lease.c */
 void lease_update_file(int force, time_t now);
-void lease_update_dns(void);
-int lease_init(char *lease_file, char *domain, char *buff, 
-	       char *buff2, time_t now, int maxleases);
+void lease_update_dns(struct daemon *daemon);
+void lease_init(struct daemon *daemon, time_t now);
 struct dhcp_lease *lease_allocate(unsigned char *clid, int clid_len, struct in_addr addr);
 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr);
 void lease_set_hostname(struct dhcp_lease *lease, char *name, char *suffix);
@@ -387,14 +490,15 @@ struct dhcp_lease *lease_find_by_client(unsigned char *clid, int clid_len);
 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
 void lease_prune(struct dhcp_lease *target, time_t now);
 void lease_update_from_configs(struct dhcp_config *dhcp_configs, char *domain);
-/* rfc2131.c */
-int dhcp_reply(struct dhcp_context *context, 
-	       struct in_addr iface_addr,
-	       char *iface_name,
-	       int iface_mtu,
-	       struct udp_dhcp_packet *rawpacket,
-	       unsigned int sz, time_t now, char *namebuff, 
-	       struct dhcp_opt *dhcp_opts, struct dhcp_config *dhcp_configs, 
-	       char *domain_suffix, char *dhcp_file, char *dhcp_sname, 
-	       struct in_addr dhcp_next_server);
+
+/* rfc2131.c */
+int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_name, unsigned int sz, time_t now);
+
+/* dnsmasq.c */
+int icmp_ping(struct daemon *daemon, struct in_addr addr);
+
+/* isc.c */
+#ifdef HAVE_ISC_READER
+void load_dhcp(struct daemon *daemon, time_t now);
+#endif
 

src/isc.c

@@ -0,0 +1,246 @@
+/* dnsmasq is Copyright (c) 2000 - 2004 by Simon Kelley
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 dated June, 1991.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+*/
+
+
+/* Code in this file is based on contributions by John Volpe. */
+
+#include "dnsmasq.h"
+
+#ifdef HAVE_ISC_READER
+
+struct isc_lease {
+  char *name, *fqdn;
+  time_t expires;
+  struct in_addr addr;
+  struct isc_lease *next;
+};
+
+static struct isc_lease *leases = NULL;
+static off_t lease_file_size = (off_t)0;
+static ino_t lease_file_inode = (ino_t)0;
+static int logged_lease = 0;
+
+static int next_token (char *token, int buffsize, FILE * fp)
+{
+  int c, count = 0;
+  char *cp = token;
+  
+  while((c = getc(fp)) != EOF)
+    {
+      if (c == '#')
+	do { c = getc(fp); } while (c != '\n' && c != EOF);
+      
+      if (c == ' ' || c == '\t' || c == '\n' || c == ';')
+	{
+	  if (count)
+	    break;
+	}
+      else if ((c != '"') && (count<buffsize-1))
+	{
+	  *cp++ = c;
+	  count++;
+	}
+    }
+  
+  *cp = 0;
+  return count ? 1 : 0;
+}
+
+void load_dhcp(struct daemon *daemon, time_t now)
+{
+  char *hostname = daemon->namebuff;
+  char token[MAXTOK], *dot;
+  struct in_addr host_address;
+  time_t ttd, tts;
+  FILE *fp;
+  struct isc_lease *lease, *tmp, **up;
+  struct stat statbuf;
+
+  if (stat(daemon->lease_file, &statbuf) == -1)
+    {
+      if (!logged_lease)
+	syslog(LOG_WARNING, "failed to access %s: %m", daemon->lease_file);
+      logged_lease = 1;
+      return;
+    }
+  
+  logged_lease = 0;
+  
+  if ((statbuf.st_size <= lease_file_size) &&
+      (statbuf.st_ino == lease_file_inode))
+    return;
+  
+  lease_file_size = statbuf.st_size;
+  lease_file_inode = statbuf.st_ino;
+  
+  if (!(fp = fopen (daemon->lease_file, "r")))
+    {
+      syslog (LOG_ERR, "failed to load %s: %m", daemon->lease_file);
+      return;
+    }
+  
+  syslog (LOG_INFO, "reading %s", daemon->lease_file);
+
+  while ((next_token(token, MAXTOK, fp)))
+    {
+      if (strcmp(token, "lease") == 0)
+        {
+          hostname[0] = '\0';
+	  ttd = tts = (time_t)(-1);
+	  if (next_token(token, MAXTOK, fp) && 
+	      (host_address.s_addr = inet_addr(token)) != (in_addr_t) -1)
+            {
+              if (next_token(token, MAXTOK, fp) && *token == '{')
+                {
+                  while (next_token(token, MAXTOK, fp) && *token != '}')
+                    {
+                      if ((strcmp(token, "client-hostname") == 0) ||
+			  (strcmp(token, "hostname") == 0))
+			{
+			  if (next_token(hostname, MAXDNAME, fp))
+			    if (!canonicalise(hostname))
+			      {
+				*hostname = 0;
+				syslog(LOG_ERR, "bad name in %s", daemon->lease_file); 
+			      }
+			}
+                      else if ((strcmp(token, "ends") == 0) ||
+			       (strcmp(token, "starts") == 0))
+                        {
+                          struct tm lease_time;
+			  int is_ends = (strcmp(token, "ends") == 0);
+			  if (next_token(token, MAXTOK, fp) &&  /* skip weekday */
+			      next_token(token, MAXTOK, fp) &&  /* Get date from lease file */
+			      sscanf (token, "%d/%d/%d", 
+				      &lease_time.tm_year,
+				      &lease_time.tm_mon,
+				      &lease_time.tm_mday) == 3 &&
+			      next_token(token, MAXTOK, fp) &&
+			      sscanf (token, "%d:%d:%d:", 
+				      &lease_time.tm_hour,
+				      &lease_time.tm_min, 
+				      &lease_time.tm_sec) == 3)
+			    {
+			      /* There doesn't seem to be a universally available library function
+				 which converts broken-down _GMT_ time to seconds-in-epoch.
+				 The following was borrowed from ISC dhcpd sources, where
+                                 it is noted that it might not be entirely accurate for odd seconds.
+				 Since we're trying to get the same answer as dhcpd, that's just
+				 fine here. */
+			      static int months [11] = { 31, 59, 90, 120, 151, 181,
+							 212, 243, 273, 304, 334 };
+			      time_t time = ((((((365 * (lease_time.tm_year - 1970) + /* Days in years since '70 */
+						  (lease_time.tm_year - 1969) / 4 +   /* Leap days since '70 */
+						  (lease_time.tm_mon > 1                /* Days in months this year */
+						   ? months [lease_time.tm_mon - 2]
+						   : 0) +
+						  (lease_time.tm_mon > 2 &&         /* Leap day this year */
+						   !((lease_time.tm_year - 1972) & 3)) +
+						  lease_time.tm_mday - 1) * 24) +   /* Day of month */
+						lease_time.tm_hour) * 60) +
+					      lease_time.tm_min) * 60) + lease_time.tm_sec;
+			      if (is_ends)
+				ttd = time;
+			      else
+				tts = time;			    }
+                        }
+		    }
+		  
+		  /* missing info? */
+		  if (!*hostname)
+		    continue;
+		  if (ttd == (time_t)(-1))
+		    continue;
+		  
+		  /* We use 0 as infinite in ttd */
+		  if ((tts != -1) && (ttd == tts - 1))
+		    ttd = (time_t)0;
+		  else if (difftime(now, ttd) > 0)
+		    continue;
+
+		  if ((dot = strchr(hostname, '.')))
+		    { 
+		      if (!daemon->domain_suffix || hostname_isequal(dot+1, daemon->domain_suffix))
+			{
+			  syslog(LOG_WARNING, 
+				 "Ignoring DHCP lease for %s because it has an illegal domain part", 
+				 hostname);
+			  continue;
+			}
+		      *dot = 0;
+		    }
+
+		  for (lease = leases; lease; lease = lease->next)
+		    if (hostname_isequal(lease->name, hostname))
+		      {
+			lease->expires = ttd;
+			lease->addr = host_address;
+			break;
+		      }
+
+		  if (!lease && (lease = malloc(sizeof(struct isc_lease))))
+		    {
+		      lease->expires = ttd;
+		      lease->addr = host_address;
+		      lease->fqdn =  NULL;
+		      lease->next = leases;
+		      if (!(lease->name = malloc(strlen(hostname)+1)))
+			free(lease);
+		      else
+			{
+			  leases = lease;
+			  strcpy(lease->name, hostname);
+			  if (daemon->domain_suffix && 
+			      (lease->fqdn = malloc(strlen(hostname) + strlen(daemon->domain_suffix) + 2)))
+			    {
+			      strcpy(lease->fqdn, hostname);
+			      strcat(lease->fqdn, ".");
+			      strcat(lease->fqdn, daemon->domain_suffix);
+			    }
+			}
+		    }
+		}
+	    }
+	}
+    }
+
+  fclose(fp);
+  
+  /* prune expired leases */
+  for (lease = leases, up = &leases; lease; lease = tmp)
+     {
+       tmp = lease->next;
+       if (lease->expires != (time_t)0 && difftime(now, lease->expires) > 0)
+	 {
+	   *up = lease->next; /* unlink */
+	   free(lease->name);
+	   if (lease->fqdn)
+	     free(lease->fqdn);
+	   free(lease);
+	 }
+       else
+	 up = &lease->next;
+     }
+
+     
+  /* remove all existing DHCP cache entries */
+  cache_unhash_dhcp();
+
+  for (lease = leases; lease; lease = lease->next)
+    {
+      cache_add_dhcp_entry(daemon, lease->fqdn, &lease->addr, lease->expires);
+      cache_add_dhcp_entry(daemon, lease->name, &lease->addr, lease->expires);
+    }
+}
+
+#endif
+

src/lease.c

@@ -15,12 +15,11 @@
 #include "dnsmasq.h"
 
 static struct dhcp_lease *leases;
-FILE *lease_file;
-int dns_dirty, file_dirty, new_lease;
-int leases_left;
+static FILE *lease_file;
+static int dns_dirty, file_dirty, new_lease;
+static int leases_left;
 
-int lease_init(char *filename, char *domain, char *buff, 
-	       char *buff2, time_t now, int maxleases)
+void lease_init(struct daemon *daemon, time_t now)
 {
   unsigned int e0, e1, e2, e3, e4, e5, a0, a1, a2, a3;
   unsigned long ei;
@@ -30,15 +29,22 @@ int lease_init(char *filename, char *domain, char *buff,
   struct dhcp_lease *lease;
   int clid_len = 0;
   int has_old = 0;
-
+  char *buff = daemon->dhcp_buff;
+  char *buff2 = daemon->dhcp_buff2;
+  
   leases = NULL;
-  leases_left = maxleases;
+  leases_left = daemon->dhcp_max;
 
-  if (!(lease_file = fopen(filename, "r+")))
+  /* NOTE: need a+ mode to create file if it doesn't exist */
+  if (!(lease_file = fopen(daemon->lease_file, "a+")))
     die("cannot open or create leases file: %s", NULL);
     
-  while (fscanf(lease_file, "%lu %x:%x:%x:%x:%x:%x %d.%d.%d.%d %256s %500s",
-		&ei, &e0, &e1, &e2, &e3, &e4, &e5, &a0, &a1, &a2, &a3, buff, buff2) == 13)
+  /* a+ mode lease pointer at end. */
+  rewind(lease_file);
+
+  while (fscanf(lease_file, "%lu %x:%x:%x:%x:%x:%x %d.%d.%d.%d %257s %257s",
+		&ei, &e0, &e1, &e2, &e3, &e4, &e5, &a0, &a1, &a2, &a3, 
+		buff, buff2) == 13)
     {
 #ifdef HAVE_BROKEN_RTC
       if (ei)
@@ -86,14 +92,14 @@ int lease_init(char *filename, char *domain, char *buff,
       memcpy(lease->hwaddr, hwaddr, ETHER_ADDR_LEN);
 
       if (strcmp(buff, "*") !=  0)
-	  lease_set_hostname(lease, buff, domain);
+	  lease_set_hostname(lease, buff, daemon->domain_suffix);
     }
   
   dns_dirty = 1;
   file_dirty = has_old;
   new_lease = 0;
 
-  return fileno(lease_file);
+  daemon->lease_fd = fileno(lease_file);
 }
 
 void lease_update_from_configs(struct dhcp_config *dhcp_configs, char *domain)
@@ -105,7 +111,7 @@ void lease_update_from_configs(struct dhcp_config *dhcp_configs, char *domain)
   
   for (lease = leases; lease; lease = lease->next)
     if ((config = find_config(dhcp_configs, NULL, lease->clid, lease->clid_len, lease->hwaddr, NULL)) && 
-	(config->hostname))
+	(config->flags & CONFIG_NAME))
       lease_set_hostname(lease, config->hostname, domain);
 }
 
@@ -141,7 +147,7 @@ void lease_update_file(int force, time_t now)
 		  expires, lease->hwaddr[0], lease->hwaddr[1],
 		  lease->hwaddr[2], lease->hwaddr[3], lease->hwaddr[4],
 		  lease->hwaddr[5], inet_ntoa(lease->addr),
-		  lease->hostname ? lease->hostname : "*");
+		  lease->hostname && strlen(lease->hostname) != 0 ? lease->hostname : "*");
 	  
 	  if (lease->clid_len)
 	    {
@@ -161,7 +167,7 @@ void lease_update_file(int force, time_t now)
     }
 }
 
-void lease_update_dns(void)
+void lease_update_dns(struct daemon *daemon)
 {
   struct dhcp_lease *lease;
   
@@ -171,13 +177,8 @@ void lease_update_dns(void)
       
       for (lease = leases; lease; lease = lease->next)
 	{
-	  if (lease->fqdn)
-	    {
-	      cache_add_dhcp_entry(lease->fqdn, &lease->addr, lease->expires, F_REVERSE);
-	      cache_add_dhcp_entry(lease->hostname, &lease->addr, lease->expires, 0);
-	    }
-	  else if (lease->hostname)
-	    cache_add_dhcp_entry(lease->hostname, &lease->addr, lease->expires, F_REVERSE);
+	  cache_add_dhcp_entry(daemon, lease->fqdn, &lease->addr, lease->expires);
+	  cache_add_dhcp_entry(daemon, lease->hostname, &lease->addr, lease->expires);
 	}
       
       dns_dirty = 0;
@@ -216,9 +217,6 @@ void lease_prune(struct dhcp_lease *target, time_t now)
   
 struct dhcp_lease *lease_find_by_client(unsigned char *clid, int clid_len)
 {
-  /* zero length means clid from hwaddr: never match am option clid to
-     a hardware-address derived clid */
-  
   struct dhcp_lease *lease;
 
   if (clid_len)
@@ -231,8 +229,7 @@ struct dhcp_lease *lease_find_by_client(unsigned char *clid, int clid_len)
   else
     {
       for (lease = leases; lease; lease = lease->next)	
-	if (!lease->clid &&
-	    memcmp(clid, lease->hwaddr, ETHER_ADDR_LEN) == 0)
+	if (memcmp(clid, lease->hwaddr, ETHER_ADDR_LEN) == 0)
 	  return lease;
     }
   
@@ -307,7 +304,7 @@ void lease_set_hostname(struct dhcp_lease *lease, char *name, char *suffix)
   struct dhcp_lease *lease_tmp;
   char *new_name = NULL, *new_fqdn = NULL;
 
-  if (lease->hostname && name && strcmp(lease->hostname, name) == 0)
+  if (lease->hostname && name && hostname_isequal(lease->hostname, name))
     return;
 
   if (!name && !lease->hostname)

src/network.c

@@ -14,57 +14,60 @@
 
 #include "dnsmasq.h"
 
-static struct irec *add_iface(struct irec *list, char *name, union mysockaddr *addr, 
-			      struct iname *names, struct iname *addrs, 
-			      struct iname *except)
+static struct irec *add_iface(struct daemon *daemon, struct irec *list, char *name, union mysockaddr *addr) 
 {
   struct irec *iface;
   struct iname *tmp;
   
   /* check blacklist */
-  if (except)
-    for (tmp = except; tmp; tmp = tmp->next)
+  if (daemon->if_except)
+    for (tmp = daemon->if_except; tmp; tmp = tmp->next)
       if (tmp->name && strcmp(tmp->name, name) == 0)
-	return NULL;
-  
+	{
+	  /* record address of named interfaces, for TCP access control */
+	  tmp->addr = *addr;
+	  return list;
+	}
+
   /* we may need to check the whitelist */
-  if (names || addrs)
+  if (daemon->if_names || daemon->if_addrs)
     { 
-      for (tmp = names; tmp; tmp = tmp->next)
+      int found = 0;
+
+      for (tmp = daemon->if_names; tmp; tmp = tmp->next)
 	if (tmp->name && (strcmp(tmp->name, name) == 0))
-	  break;
-      if (!tmp && !addrs) 
-	return NULL;
- 
-      for (tmp = addrs; tmp; tmp = tmp->next)
+	  {
+	    tmp->addr = *addr;
+	    found = tmp->used = 1;
+	  }
+
+      for (tmp = daemon->if_addrs; tmp; tmp = tmp->next)
 	if (sockaddr_isequal(&tmp->addr, addr))
-	  break;
-      if (!tmp) 
-	return NULL;
+	  found = tmp->used = 1;
+      
+      if (!found) 
+	return list;
     }
   
   /* check whether the interface IP has been added already 
      it is possible to have multiple interfaces with the same address */
-  for (; list; list = list->next) 
-    if (sockaddr_isequal(&list->addr, addr))
+  for (iface = list; iface; iface = iface->next) 
+    if (sockaddr_isequal(&iface->addr, addr))
       break;
-  if (list)
-    return NULL;
+  if (iface)
+    return list;
   
   /* If OK, add it to the head of the list */
   iface = safe_malloc(sizeof(struct irec));
   iface->addr = *addr;
-
+  iface->next = list;
   return iface;
 }
 
 
-struct irec *enumerate_interfaces(struct iname *names,
-				  struct iname *addrs,
-				  struct iname *except,
-				  int port)
+struct irec *enumerate_interfaces(struct daemon *daemon)
 {
-  struct irec *iface = NULL, *new;
+  struct irec *iface = NULL;
   char *buf, *ptr;
   struct ifreq *ifr = NULL;
   struct ifconf ifc;
@@ -74,7 +77,7 @@ struct irec *enumerate_interfaces(struct iname *names,
   
   if (fd == -1)
     die ("cannot create socket to enumerate interfaces: %s", NULL);
-      
+        
   while (1)
      {
        buf = safe_malloc(len);
@@ -118,7 +121,7 @@ struct irec *enumerate_interfaces(struct iname *names,
       if (ifr->ifr_addr.sa_family == AF_INET)
 	{
 	  addr.in = *((struct sockaddr_in *) &ifr->ifr_addr);
-	  addr.in.sin_port = htons(port);
+	  addr.in.sin_port = htons(daemon->port);
 	}
 #ifdef HAVE_IPV6
       else if (ifr->ifr_addr.sa_family == AF_INET6)
@@ -128,7 +131,7 @@ struct irec *enumerate_interfaces(struct iname *names,
 #else
 	  addr.in6 = *((struct sockaddr_in6 *) &ifr->ifr_addr);
 #endif
-	  addr.in6.sin6_port = htons(port);
+	  addr.in6.sin6_port = htons(daemon->port);
 	  addr.in6.sin6_flowinfo = htonl(0);
 	}
 #endif
@@ -140,21 +143,27 @@ struct irec *enumerate_interfaces(struct iname *names,
 
       /* If we are restricting the set of interfaces to use, make
 	 sure that loopback interfaces are in that set. */
-      if (names && (ifr->ifr_flags & IFF_LOOPBACK))
+      if (daemon->if_names && (ifr->ifr_flags & IFF_LOOPBACK))
 	{
-	  struct iname *lo = safe_malloc(sizeof(struct iname));
-	  lo->name = safe_string_alloc(ifr->ifr_name);
-	  lo->next = names->next;
-	  names->next = lo;
-	}
-      
-      if ((new = add_iface(iface, ifr->ifr_name, 
-			   &addr, names, addrs, except)))
-	{
-	  new->next = iface;
-	  iface = new;
+	  struct iname *lo;
+	  for (lo = daemon->if_names; lo; lo = lo->next)
+	    if (lo->name && strcmp(lo->name, ifr->ifr_name) == 0)
+	      {
+		lo->isloop = 1;
+		break;
+	      }
+	  if (!lo)
+	    {
+	      lo = safe_malloc(sizeof(struct iname));
+	      lo->name = safe_string_alloc(ifr->ifr_name);
+	      lo->isloop = lo->used = 1;
+	      lo->next = daemon->if_names;
+	      daemon->if_names = lo;
+	    }
 	}
 
+      iface = add_iface(daemon, iface, ifr->ifr_name, &addr);
+	
 #if defined(HAVE_LINUX_IPV6_PROC) && defined(HAVE_IPV6)
       /* IPv6 addresses don't seem to work with SIOCGIFCONF. Barf */
       /* This code snarfed from net-tools 1.60 and certainly linux specific, though
@@ -184,7 +193,7 @@ struct irec *enumerate_interfaces(struct iname *names,
 			sscanf(addrstring+i+i, "%02x", &byte);
 			addr6p[i] = byte;
 		      }
-		    addr6.in6.sin6_port = htons(port);
+		    addr6.in6.sin6_port = htons(daemon->port);
 		    addr6.in6.sin6_flowinfo = htonl(0);
 		    addr6.in6.sin6_scope_id = htonl(scope);
 		    
@@ -196,12 +205,8 @@ struct irec *enumerate_interfaces(struct iname *names,
 	    fclose(f);
 	  }
 	
-	if (found && (new = add_iface(iface, ifr->ifr_name,
-				      &addr6, names, addrs, except)))
-	  {
-	    new->next = iface;
-	    iface = new;
-	  }
+	if (found)
+	  iface = add_iface(daemon, iface, ifr->ifr_name, &addr6);
       }
 #endif /* LINUX */
     }
@@ -217,36 +222,14 @@ struct irec *enumerate_interfaces(struct iname *names,
   return iface;
 }
 
-struct listener *create_wildcard_listeners(int port)
+#ifdef HAVE_IPV6
+static int create_ipv6_listener(struct listener **link, int port)
 {
   union mysockaddr addr;
+  int tcpfd, fd, flags, save;
+  struct listener *l;
   int opt = 1;
-  struct listener *listen;
-#ifdef HAVE_IPV6
-  int fd;
-#endif
 
-  addr.in.sin_family = AF_INET;
-  addr.in.sin_addr.s_addr = INADDR_ANY;
-  addr.in.sin_port = htons(port);
-#ifdef HAVE_SOCKADDR_SA_LEN
-  addr.in.sin_len = sizeof(struct sockaddr_in);
-#endif
-  listen = safe_malloc(sizeof(struct listener));
-  if ((listen->fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
-    die("failed to create socket: %s", NULL);
-  if (setsockopt(listen->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
-#if defined(IP_PKTINFO) 
-      setsockopt(listen->fd, SOL_IP, IP_PKTINFO, &opt, sizeof(opt)) == -1 ||
-#elif defined(IP_RECVDSTADDR) && defined(IP_RECVIF)
-      setsockopt(listen->fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt)) == -1 ||
-      setsockopt(listen->fd, IPPROTO_IP, IP_RECVIF, &opt, sizeof(opt)) == -1 ||
-#endif 
-      bind(listen->fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
-    die("failed to bind socket: %s", NULL);
-  listen->next = NULL;
-  listen->family = AF_INET;
-#ifdef HAVE_IPV6
   addr.in6.sin6_family = AF_INET6;
   addr.in6.sin6_addr = in6addr_any;
   addr.in6.sin6_port = htons(port);
@@ -254,56 +237,165 @@ struct listener *create_wildcard_listeners(int port)
 #ifdef HAVE_SOCKADDR_SA_LEN
   addr.in6.sin6_len = sizeof(struct sockaddr_in6);
 #endif
+
+  /* No error of the kernel doesn't support IPv6 */
   if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) == -1)
-    {
-      if (errno != EPROTONOSUPPORT &&
-	  errno != EAFNOSUPPORT &&
-	  errno != EINVAL)
-	die("failed to create IPv6 socket: %s", NULL);
-    }
-  else
-    {
-      listen->next = safe_malloc(sizeof(struct listener));
-      listen->next->fd = fd;
-      listen->next->family = AF_INET6;
-      listen->next->next = NULL;
-      if (setsockopt(listen->next->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
-	  setsockopt(listen->next->fd, IPV6_LEVEL, IPV6_PKTINFO, &opt, sizeof(opt)) == -1 ||
-	  bind(listen->next->fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
-	die("failed to bind IPv6 socket: %s", NULL);
-    }
-#endif
+    return (errno == EPROTONOSUPPORT ||
+	    errno == EAFNOSUPPORT ||
+	    errno == EINVAL);
   
-  return listen;
+  if ((tcpfd = socket(AF_INET6, SOCK_STREAM, 0)) == -1)
+    {
+      save = errno;
+      close(fd);
+      errno = save;
+      return 0;
+    }
+  
+  if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+      setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+      setsockopt(fd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
+      setsockopt(tcpfd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
+      (flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+      (flags = fcntl(tcpfd, F_GETFL, 0)) == -1 ||
+      fcntl(tcpfd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+#ifdef IPV6_RECVPKTINFO
+      setsockopt(fd, IPV6_LEVEL, IPV6_RECVPKTINFO, &opt, sizeof(opt)) == -1 ||
+#else
+      setsockopt(fd, IPV6_LEVEL, IPV6_PKTINFO, &opt, sizeof(opt)) == -1 ||
+#endif
+      bind(tcpfd, (struct sockaddr *)&addr, sa_len(&addr)) == -1 ||
+      listen(tcpfd, 5) == -1 ||
+      bind(fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1) 
+    {
+      save = errno;
+      close(fd);
+      close(tcpfd);
+      errno = save;
+      return 0;
+    }
+  
+  l = safe_malloc(sizeof(struct listener));
+  l->fd = fd;
+  l->tcpfd = tcpfd;
+  l->family = AF_INET6;
+  l->next = NULL;
+  *link = l;
+  
+  return 1;
+}
+#endif
+
+struct listener *create_wildcard_listeners(int port)
+{
+#if !(defined(IP_PKTINFO) || (defined(IP_RECVDSTADDR) && defined(IP_RECVIF) && defined(IP_SENDSRCADDR)))
+  return NULL;
+#else
+  union mysockaddr addr;
+  int opt = 1;
+  struct listener *l, *l6 = NULL;
+  int flags;
+  int tcpfd, fd;
+
+  addr.in.sin_family = AF_INET;
+  addr.in.sin_addr.s_addr = INADDR_ANY;
+  addr.in.sin_port = htons(port);
+#ifdef HAVE_SOCKADDR_SA_LEN
+  addr.in.sin_len = sizeof(struct sockaddr_in);
+#endif
+
+  if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
+    return NULL;
+  
+  if ((tcpfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
+    {
+      close (fd);
+      return NULL;
+    }
+  
+  if (setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+      bind(tcpfd, (struct sockaddr *)&addr, sa_len(&addr)) == -1 ||
+      listen(tcpfd, 5) == -1 ||
+      (flags = fcntl(tcpfd, F_GETFL, 0)) == -1 ||
+      fcntl(tcpfd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+#ifdef HAVE_IPV6
+      !create_ipv6_listener(&l6, port) ||
+#endif
+      setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+      (flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+#if defined(IP_PKTINFO) 
+      setsockopt(fd, SOL_IP, IP_PKTINFO, &opt, sizeof(opt)) == -1 ||
+#elif defined(IP_RECVDSTADDR) && defined(IP_RECVIF)
+      setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt)) == -1 ||
+      setsockopt(fd, IPPROTO_IP, IP_RECVIF, &opt, sizeof(opt)) == -1 ||
+#endif 
+      bind(fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
+    {
+      close(fd);
+      close(tcpfd);
+      return NULL;
+    }
+  
+  l = safe_malloc(sizeof(struct listener));
+  l->family = AF_INET;
+  l->fd = fd;
+  l->tcpfd = tcpfd;
+  l->next = l6;
+
+  return l;
+
+#endif
 }
 
-struct listener *create_bound_listeners(struct irec *interfaces)
+struct listener *create_bound_listeners(struct irec *interfaces, int port)
 {
 
   struct listener *listeners = NULL;
   struct irec *iface;
-  int opt = 1;
-
+  int flags = port, opt = 1;
+  
   for (iface = interfaces ;iface; iface = iface->next)
     {
       struct listener *new = safe_malloc(sizeof(struct listener));
       new->family = iface->addr.sa.sa_family;
       new->next = listeners;
       listeners = new;
-      if ((new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1)
-	die("failed to create socket: %s", NULL);
-      if (setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
-	  bind(new->fd, &iface->addr.sa, sa_len(&iface->addr)) == -1)
-	die("failed to bind socket: %s", NULL);
+      if ((new->tcpfd = socket(iface->addr.sa.sa_family, SOCK_STREAM, 0)) == -1 ||
+	  (new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1 ||
+	  setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+	  setsockopt(new->tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+	  /* See Stevens 16.6 */
+	  (flags = fcntl(new->tcpfd, F_GETFL, 0)) == -1 ||
+	  fcntl(new->tcpfd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+	  (flags = fcntl(new->fd, F_GETFL, 0)) == -1 ||
+	  fcntl(new->fd, F_SETFL, flags | O_NONBLOCK) == -1)
+	die("failed to create listening socket: %s", NULL);
+      
+#ifdef HAVE_IPV6
+      if (iface->addr.sa.sa_family == AF_INET6)
+	{
+	  if (setsockopt(new->fd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
+	      setsockopt(new->tcpfd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1)
+	    die("failed to set IPV6 options on listening socket: %s", NULL);
+	}
+#endif
+      
+      if (bind(new->tcpfd, &iface->addr.sa, sa_len(&iface->addr)) == -1 ||
+	  bind(new->fd, &iface->addr.sa, sa_len(&iface->addr)) == -1 ||
+	  listen(new->tcpfd, 5) == -1)
+	die("failed to bind listening socket: %s", NULL);
     }
-
+  
   return listeners;
 }
 
-static struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds)
+struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds)
 {
   struct serverfd *sfd;
-  
+  int flags;
+
   /* may have a suitable one already */
   for (sfd = *sfds; sfd; sfd = sfd->next )
     if (sockaddr_isequal(&sfd->source_addr, addr))
@@ -320,7 +412,9 @@ static struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **s
       return NULL;
     }
   
-  if (bind(sfd->fd, (struct sockaddr *)addr, sa_len(addr)) == -1)
+  if (bind(sfd->fd, (struct sockaddr *)addr, sa_len(addr)) == -1 ||
+      (flags = fcntl(sfd->fd, F_GETFL, 0)) == -1 ||
+      fcntl(sfd->fd, F_SETFL, flags | O_NONBLOCK) == -1)
     {
       int errsave = errno; /* save error from bind. */
       close(sfd->fd);
@@ -336,17 +430,19 @@ static struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **s
   return sfd;
 }
 
-struct server *check_servers(struct server *new, struct irec *interfaces, struct serverfd **sfds)
+void check_servers(struct daemon *daemon, struct irec *interfaces)
 {
   char addrbuff[ADDRSTRLEN];
   struct irec *iface;
-  struct server *tmp, *ret = NULL;
+  struct server *new, *tmp, *ret = NULL;
   int port = 0;
 
   /* forward table rules reference servers, so have to blow them away */
   forward_init(0);
   
-  for (;new; new = tmp)
+  daemon->last_server = NULL;
+  
+  for (new = daemon->servers; new; new = tmp)
     {
       tmp = new->next;
       
@@ -378,7 +474,7 @@ struct server *check_servers(struct server *new, struct irec *interfaces, struct
 	    }
 	  
 	  /* Do we need a socket set? */
-	  if (!new->sfd && !(new->sfd = allocate_sfd(&new->source_addr, sfds)))
+	  if (!new->sfd && !(new->sfd = allocate_sfd(&new->source_addr, &daemon->sfds)))
 	    {
 	      syslog(LOG_WARNING, 
 		     "ignoring nameserver %s - cannot make/bind socket: %m", addrbuff);
@@ -408,15 +504,16 @@ struct server *check_servers(struct server *new, struct irec *interfaces, struct
 	syslog(LOG_INFO, "using nameserver %s#%d", addrbuff, port); 
     }
   
- return ret;
+  daemon->servers = ret;
 }
   
-struct server *reload_servers(char *fname, char *buff, struct server *serv, int query_port)
+void reload_servers(char *fname, struct daemon *daemon)
 {
   FILE *f;
   char *line;
   struct server *old_servers = NULL;
   struct server *new_servers = NULL;
+  struct server *serv = daemon->servers;
 
   /* move old servers to free list - we can reuse the memory 
      and not risk malloc if there are the same or fewer new servers. 
@@ -446,7 +543,7 @@ struct server *reload_servers(char *fname, char *buff, struct server *serv, int
   else
     {
       syslog(LOG_INFO, "reading %s", fname);
-      while ((line = fgets(buff, MAXDNAME, f)))
+      while ((line = fgets(daemon->namebuff, MAXDNAME, f)))
 	{
 	  union  mysockaddr addr, source_addr;
 	  char *token = strtok(line, " \t\n\r");
@@ -454,7 +551,7 @@ struct server *reload_servers(char *fname, char *buff, struct server *serv, int
 	  
 	  if (!token || strcmp(token, "nameserver") != 0)
 	    continue;
-	  if (!(token = strtok(NULL, " \t\n")))
+	  if (!(token = strtok(NULL, " \t\n\r")))
 	    continue;
 	  
 #ifdef HAVE_IPV6
@@ -469,7 +566,7 @@ struct server *reload_servers(char *fname, char *buff, struct server *serv, int
 	      source_addr.in.sin_family = addr.in.sin_family = AF_INET;
 	      addr.in.sin_port = htons(NAMESERVER_PORT);
 	      source_addr.in.sin_addr.s_addr = INADDR_ANY;
-	      source_addr.in.sin_port = htons(query_port);
+	      source_addr.in.sin_port = htons(daemon->query_port);
 	    }
 #ifdef HAVE_IPV6
 	  else if (inet_pton(AF_INET6, token, &addr.in6.sin6_addr))
@@ -481,7 +578,7 @@ struct server *reload_servers(char *fname, char *buff, struct server *serv, int
 	      addr.in6.sin6_port = htons(NAMESERVER_PORT);
 	      source_addr.in6.sin6_flowinfo = addr.in6.sin6_flowinfo = htonl(0);
 	      source_addr.in6.sin6_addr = in6addr_any;
-	      source_addr.in6.sin6_port = htons(query_port);
+	      source_addr.in6.sin6_port = htons(daemon->query_port);
 	    }
 #endif /* IPV6 */
 	  else
@@ -517,7 +614,7 @@ struct server *reload_servers(char *fname, char *buff, struct server *serv, int
       old_servers = tmp;
     }
 
-  return new_servers;
+  daemon->servers = new_servers;
 }
 
 

src/util.c

@@ -11,7 +11,7 @@
 */
 
 
-/* Code in this file contributed by Rob Funk. */
+/* Some code in this file contributed by Rob Funk. */
 
 #include "dnsmasq.h"
 
@@ -85,6 +85,18 @@ unsigned short rand16(void)
   return( (unsigned short) (rand() >> 15) );
 }
 
+int atoi_check(char *a, int *res)
+{
+  char *p;
+
+  for (p = a; *p; p++)
+     if (*p < '0' || *p > '9')
+       return 0;
+
+  *res = atoi(a);
+  return 1;
+}
+
 int legal_char(char c)
 {
   /* check for legal char a-z A-Z 0-9 - 
@@ -100,12 +112,18 @@ int legal_char(char c)
   
 int canonicalise(char *s)
 {
-  /* check for legal chars ans remove trailing . */
+  /* check for legal chars and remove trailing . 
+     also fail empty string. */
   int l = strlen(s);
   char c;
 
-  if (l>0 && s[l-1] == '.')
-    s[l-1] = 0;
+  if (l == 0) return 0;
+
+  if (s[l-1] == '.')
+    {
+      if (l == 1) return 0;
+      s[l-1] = 0;
+    }
 
   while ((c = *s++))
     if (c != '.' && !legal_char(c))
@@ -228,3 +246,25 @@ time_t dnsmasq_time(int fd)
   return time(NULL);
 #endif
 }
+
+int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask)
+{
+  return (a.s_addr & mask.s_addr) == (b.s_addr & mask.s_addr);
+} 
+
+int retry_send(void)
+{
+   struct timespec waiter;
+   if (errno == EAGAIN)
+     {
+       waiter.tv_sec = 0;
+       waiter.tv_nsec = 10000;
+       nanosleep(&waiter, NULL);
+       return 1;
+     }
+   
+   if (errno == EINTR)
+     return 1;
+
+   return 0;
+}