import of dnsmasq-2.10.tar.gz

CHANGELOG

@@ -1056,3 +1056,71 @@ release 2.9
 	     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.
+
+

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
+A: Update: from version 2.10, it does. There are a few limitations:
-   sorts of queries which dnsmasq is used for are always sent via UDP. Adding 
+   data obtained via TCP is not cached, and dynamically-created
-   TCP support would make dnsmasq much more heavyweight for no practical 
+   interfaces may break under certain circumstances. Source-address
-   benefit. If you really want to do zone transfers, forward port 53 TCP 
+   or query-port specifications are ignored for TCP.
-   using in-kernel port-forwarding or a port-fowarder like rinetd.
-
 
 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?

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

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
+
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+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+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>

dnsmasq-rh.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.9
+Version: 2.10
 Release: 1
 Copyright: GPL
 Group: System Environment/Daemons

dnsmasq-suse.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.9
+Version: 2.10
 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

dnsmasq.8

@@ -73,19 +73,29 @@ 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
+Listen only on the specified interface(s). Dnsmasq automatically adds
-.B \-i
+the loopback (local) interface to the list of interfaces to use when
-flags are given, dnsmasq listens on all available interfaces unless overridden by 
+the
-.B \-a
+.B \--interface
+option  is used. If no
+.B \--interface
 or
-.B \-I
+.B \--listen-address
-flags. If IP alias interfaces (eg "eth1:0") are used with
+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
@@ -95,21 +105,30 @@ 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 
+Listen on the given IP address(es). Both 
-.B \-i
+.B \--interface
-more than one address may be specified. Unlike 
+and
-.B \-i
+.B \--listen-address
-the loopback interface is not special: if dnsmasq is to listen on the loopback interface, 
+options may be given, in which case the set of both interfaces and
-it's IP, 127.0.0.1, must be explicitly given. If no 
+addresses is used. Note that if no
-.B \-a
+.B \--interface
-flags are given, dnsmasq listens on all available interfaces unless overridden by 
+option is given, but 
-.B \-i
+.B \--listen-address
-or
+is, dnsmasq will not automatically listen on the loopback
-.B \-I
+interface. To achieve this, its IP address, 127.0.0.1, must be
-flags.
+explicitly given as a 
+.B \--listen-address
+option.
 .TP
 .B \-z, --bind-interfaces
 On systems which support it, dnsmasq binds the wildcard address,
@@ -126,7 +145,8 @@ 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

doc.html

@@ -18,9 +18,11 @@ 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>
+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, Freesco, CoyoteLinux and
+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.
 <P>
 Dnsmasq provides the following features:

rpm/dnsmasq-SuSE.patch

@@ -0,0 +1,42 @@
+--- dnsmasq.8	2004-06-21 21:55:47.000000000 +0200
++++ dnsmasq.8	2004-06-22 23:30:18.000000000 +0200
+@@ -63,7 +63,7 @@
+ .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	2004-05-26 12:59:56.000000000 +0200
++++ dnsmasq.conf.example	2004-06-22 23:32:36.000000000 +0200
+@@ -62,7 +62,7 @@
+ 
+ # 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	2004-06-22 21:14:50.000000000 +0200
++++ src/config.h	2004-06-22 23:31:46.000000000 +0200
+@@ -38,7 +38,7 @@
+ #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
+@@ -171,7 +171,7 @@
+ 
+ /* 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/config.h

@@ -12,10 +12,13 @@
 
 /* Author's email: simon@thekelleys.org.uk */
 
-#define VERSION "2.9"
+#define VERSION "2.10"
 
 #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 */
@@ -31,9 +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 */
@@ -63,7 +69,7 @@
 /* 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)
@@ -89,7 +95,6 @@
    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. 

src/dhcp.c

@@ -368,28 +368,25 @@ int address_available(struct dhcp_context *context, struct in_addr taddr)
   if (addr > end)
     return 0;
 
-  if (lease_find_by_addr(taddr))
-    return 0;
-  
   return 1;
 }
 
 int address_allocate(struct dhcp_context *context, struct dhcp_config *configs,
 		     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, addr ;
-  int i, j;
+  unsigned int i, j;
 
   /* start == end means no dynamic leases. */
   if (context->end.s_addr == context->start.s_addr)
     return 0;
   
   /* pick a seed based on hwaddr then iterate until we find a free address. */
-  for (j = 0, i = 0; i < ETHER_ADDR_LEN; i++)
+  for (j = context->addr_epoch, i = 0; i < ETHER_ADDR_LEN; i++)
     j += hwaddr[i] + (hwaddr[i] << 8) + (hwaddr[i] << 16);
   
   start.s_addr = addr.s_addr = 

src/dnsmasq.c

@@ -10,13 +10,11 @@
    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)
 {
@@ -27,7 +25,22 @@ static void sig_handler(int sig)
   else if (sig == SIGUSR1)
     sigusr1 = 1;
   else if (sig == SIGALRM)
-    sigalarm = 1;
+    {
+      /* 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 */
+      pid_t pid;
+      int stat;
+      
+      while ((pid = waitpid(-1, &stat, WNOHANG)) > 0)
+	num_kids--;
+    }
 }
 
 int main (int argc, char **argv)
@@ -35,6 +48,7 @@ int main (int argc, char **argv)
   int cachesize = CACHESIZ;
   int port = NAMESERVER_PORT;
   int maxleases = MAXLEASES;
+  unsigned short edns_pktsz = EDNS_PKTSZ;
   int query_port = 0;
   int first_loop = 1;
   int bind_fallback = 0;
@@ -82,6 +96,8 @@ 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;
@@ -90,6 +106,11 @@ 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 */
@@ -97,6 +118,7 @@ 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
@@ -104,7 +126,6 @@ int main (int argc, char **argv)
      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);
   
   dhcp_next_server.s_addr = 0;
   options = read_opts(argc, argv, dnamebuff, &resolv, &mxnames, &mxtarget, &lease_file,
@@ -113,7 +134,11 @@ int main (int argc, char **argv)
 		      &serv_addrs, &cachesize, &port, &query_port, &local_ttl, &addn_hosts,
 		      &dhcp, &dhcp_configs, &dhcp_options, &dhcp_vendors,
 		      &dhcp_file, &dhcp_sname, &dhcp_next_server, &maxleases, &min_leasetime,
-		      &doctors);
+		      &doctors, &edns_pktsz);
+
+  if (edns_pktsz < PACKETSZ)
+    edns_pktsz = PACKETSZ;
+  packet = safe_malloc(edns_pktsz > DNSMASQ_PACKETSZ ? edns_pktsz : DNSMASQ_PACKETSZ);
 
   if (!lease_file)
     {
@@ -136,7 +161,7 @@ int main (int argc, char **argv)
   if (options & OPT_NOWILD) 
     {
       struct iname *if_tmp;
-      listeners = create_bound_listeners(interfaces);
+      listeners = create_bound_listeners(interfaces, port);
 
       for (if_tmp = if_names; if_tmp; if_tmp = if_tmp->next)
 	if (if_tmp->name && !if_tmp->used)
@@ -185,6 +210,31 @@ int main (int argc, char **argv)
       leasefd = lease_init(lease_file, domain_suffix, dnamebuff, packet, now, maxleases);
     }
 
+  /* 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 (query_port)
+    {
+      union  mysockaddr addr;
+      addr.in.sin_family = AF_INET;
+      addr.in.sin_addr.s_addr = INADDR_ANY;
+      addr.in.sin_port = htons(query_port);
+#ifdef HAVE_SOCKADDR_SA_LEN
+      addr.in.sin_len = sizeof(struct sockaddr_in);
+#endif
+      allocate_sfd(&addr, &sfds);
+#ifdef HAVE_IPV6
+      addr.in6.sin6_family = AF_INET6;
+      addr.in6.sin6_addr = in6addr_any;
+      addr.in6.sin6_port = htons(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, &sfds);
+#endif
+    }
+  
   setbuf(stdout, NULL);
 
   if (!(options & OPT_DEBUG))
@@ -221,8 +271,12 @@ int main (int argc, char **argv)
       for (i=0; i<64; i++)
 	{
 	  for (listener = listeners; listener; listener = listener->next)
-	    if (listener->fd == i)
+	    {
-	      break;
+	      if (listener->fd == i)
+		break;
+	      if (listener->tcpfd == i)
+		break;
+	    }
 	  if (listener)
 	    continue;
 
@@ -232,6 +286,12 @@ int main (int argc, char **argv)
 	      i == dhcp_raw_fd)
 	    continue;
 
+	  for (serverfdp = sfds; serverfdp; serverfdp = serverfdp->next)
+	    if (serverfdp->fd == i)
+	      break;
+	  if (serverfdp)
+	    continue;
+
 	  close(i);
 	}
 
@@ -256,13 +316,13 @@ int main (int argc, char **argv)
 	  DNSMASQ_LOG_OPT(options & OPT_DEBUG), 
 	  DNSMASQ_LOG_FAC(options & OPT_DEBUG));
   
-  if (cachesize)
+  if (cachesize != 0)
     syslog(LOG_INFO, "started, version %s cachesize %d", VERSION, cachesize);
   else
     syslog(LOG_INFO, "started, version %s cache disabled", VERSION);
   
   if (bind_fallback)
-    syslog(LOG_WARNING, "setting --bind-interfaces option because if OS limitations");
+    syslog(LOG_WARNING, "setting --bind-interfaces option because of OS limitations");
   
   for (dhcp_tmp = dhcp; dhcp_tmp; dhcp_tmp = dhcp_tmp->next)
     {
@@ -270,7 +330,15 @@ int main (int argc, char **argv)
       if (dhcp_tmp->lease_time == 0)
 	sprintf(packet, "infinite");
       else
-	sprintf(packet, "%ds", (int)dhcp_tmp->lease_time);
+	{
+	  unsigned int x, p = 0, t = (unsigned int)dhcp_tmp->lease_time;
+	  if ((x = t/3600))
+	    p += sprintf(&packet[p], "%dh", x);
+	  if ((x = (t/60)%60))
+	    p += sprintf(&packet[p], "%dm", x);
+	  if ((x = t%60))
+	    p += sprintf(&packet[p], "%ds", x);
+	}
       syslog(LOG_INFO, 
 	     dhcp_tmp->start.s_addr == dhcp_tmp->end.s_addr ? 
 	     "DHCP, static leases only on %.0s%s, lease time %s" :
@@ -283,8 +351,8 @@ int main (int argc, char **argv)
     syslog(LOG_INFO, "DHCP, %s will be written every %ds", lease_file, min_leasetime/3);
 #endif
   
-  if (getuid() == 0 || geteuid() == 0)
+  if (!(options & OPT_DEBUG) && (getuid() == 0 || geteuid() == 0))
-    syslog(LOG_WARNING, "failed to drop root privs");
+    syslog(LOG_WARNING, "running as root");
   
   servers = check_servers(serv_addrs, interfaces, &sfds);
   last_server = NULL;
@@ -350,6 +418,9 @@ int main (int argc, char **argv)
 	      FD_SET(listener->fd, &rset);
 	      if (listener->fd > maxfd)
 		maxfd = listener->fd;
+	      FD_SET(listener->tcpfd, &rset);
+	      if (listener->tcpfd > maxfd)
+		maxfd = listener->tcpfd;
 	    }
 	  
 	  if (dhcp)
@@ -428,7 +499,8 @@ int main (int argc, char **argv)
       for (serverfdp = sfds; serverfdp; serverfdp = serverfdp->next)
 	if (FD_ISSET(serverfdp->fd, &rset))
 	  last_server = reply_query(serverfdp, options, packet, now, 
-				    dnamebuff, servers, last_server, bogus_addr, doctors);
+				    dnamebuff, servers, last_server, 
+				    bogus_addr, doctors, edns_pktsz);
 
       if (dhcp && FD_ISSET(dhcpfd, &rset))
 	dhcp_packet(dhcp, packet, dhcp_options, dhcp_configs, dhcp_vendors,
@@ -437,10 +509,105 @@ int main (int argc, char **argv)
 		    if_names, if_addrs, if_except);
       
       for (listener = listeners; listener; listener = listener->next)
-	if (FD_ISSET(listener->fd, &rset))
+	{
-	  last_server = receive_query(listener, packet,
+	  if (FD_ISSET(listener->fd, &rset))
-			mxnames, mxtarget, options, now, local_ttl, dnamebuff,
+	    last_server = receive_query(listener, packet,
-			if_names, if_addrs, if_except, last_server, servers);
+					mxnames, mxtarget, options, now, local_ttl, dnamebuff,
+					if_names, if_addrs, if_except, last_server, servers, edns_pktsz);
+
+	  if (FD_ISSET(listener->tcpfd, &rset))
+	    {
+	      int confd;
+
+	      while((confd = accept(listener->tcpfd, NULL, NULL)) == -1 && errno == EINTR);
+	      
+	      if (confd != -1)
+		{
+		  int match = 1;
+		  if (!(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 = if_except; tmp; tmp = tmp->next)
+			    if (sockaddr_isequal(&tmp->addr, &tcp_addr))
+			      match = 0;
+			  
+			  if (match && (if_names || if_addrs))
+			    {
+			      match = 0;
+			      for (tmp = if_names; tmp; tmp = tmp->next)
+				if (sockaddr_isequal(&tmp->addr, &tcp_addr))
+				  match = 1;
+			      for (tmp = 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 (!(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 (!(options & OPT_DEBUG))
+			{
+			  sigemptyset(&sigact.sa_mask);
+			  sigaddset(&sigact.sa_mask, SIGALRM);
+			  sigprocmask(SIG_UNBLOCK, &sigact.sa_mask, NULL);
+			  alarm(CHILD_LIFETIME);
+			  in_child = 1;
+			}
+		      
+		      /* start with no upstream connections. */
+		      for (s = 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(confd, mxnames, mxtarget, options, now, 
+					 local_ttl, dnamebuff, last_server, servers,
+					 bogus_addr, doctors, edns_pktsz);
+		      
+		      
+		      if (!(options & OPT_DEBUG))
+			exit(0);
+		      
+		      close(confd);
+		      if (buff)
+			free(buff);
+		      for (s = servers; s; s = s->next)
+			if (s->tcpfd != -1)
+			  close(s->tcpfd);
+		    }
+		}
+	    }
+	}
     }
   
   syslog(LOG_INFO, "exiting on receipt of SIGTERM");

src/dnsmasq.h

@@ -12,6 +12,7 @@
 
 /* Author's email: simon@thekelleys.org.uk */
 
+#define COPYRIGHT "Copyright (C) 2000-2004 Simon Kelley" 
 
 #ifdef __linux__
 /* for pselect.... */
@@ -36,6 +37,7 @@
 #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
@@ -194,7 +196,7 @@ 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; 
 };
 
@@ -204,7 +206,7 @@ struct irec {
 };
 
 struct listener {
-  int fd, family;
+  int fd, tcpfd, family;
   struct listener *next;
 };
 
@@ -285,7 +287,7 @@ struct dhcp_vendor {
 };
 
 struct dhcp_context {
-  unsigned int lease_time;
+  unsigned int lease_time, addr_epoch;
   struct in_addr netmask, broadcast;
   struct in_addr start, end; /* range of available addresses */
   struct dhcp_netid netid;
@@ -346,9 +348,10 @@ void extract_addresses(HEADER *header, unsigned int qlen, char *namebuff,
 void extract_neg_addrs(HEADER *header, unsigned int qlen, char *namebuff, time_t now);
 int answer_request(HEADER *header, char *limit, unsigned int qlen, struct mx_record *mxnames,
 		   char *mxtarget, unsigned int options, time_t now, unsigned long local_ttl,
-		   char *namebuff);
+		   char *namebuff, unsigned short edns_pcktsz);
 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);
 
 /* util.c */
 unsigned short rand16(void);
@@ -376,20 +379,30 @@ unsigned int read_opts(int argc, char **argv, char *buff, struct resolvc **resol
 		       struct dhcp_context **dhcp, struct dhcp_config **dhcp_conf, 
 		       struct dhcp_opt **opts, struct dhcp_vendor **dhcp_vendors,
 		       char **dhcp_file, char **dhcp_sname, struct in_addr *dhcp_next_server,
-		       int *maxleases, unsigned int *min_leasetime, struct doctor **doctors);
+		       int *maxleases, unsigned int *min_leasetime, struct doctor **doctors,
+		       unsigned short *edns_pktsz);
 
 /* forward.c */
 void forward_init(int first);
 struct server *reply_query(struct serverfd *sfd, int options, char *packet, time_t now,
 			   char *dnamebuff, struct server *servers, struct server *last_server, 
-			   struct bogus_addr *bogus_nxdomain, struct doctor *doctors);
+			   struct bogus_addr *bogus_nxdomain, 
+			   struct doctor *doctors, unsigned short edns_pcktsz);
 
 struct server *receive_query(struct listener *listen, char *packet, struct mx_record *mxnames, 
 			     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);
+			     struct server *last_server, struct server *servers, unsigned short edns_pcktsz);
+
+char *tcp_request(int confd, struct mx_record *mxnames, 
+		  char *mxtarget, unsigned int options, time_t now, 
+		  unsigned long local_ttl, char *namebuff,
+		  struct server *last_server, struct server *servers,
+		  struct bogus_addr *bogus_nxdomain, struct doctor *doctors,
+		  unsigned short edns_pcktsz);
 /* network.c */
+struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds);
 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,
@@ -397,7 +410,7 @@ struct irec *enumerate_interfaces(struct iname **names,
 				  struct iname *except,
 				  int port);
 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, 
@@ -448,3 +461,4 @@ int dhcp_reply(struct dhcp_context *context,
 #ifdef HAVE_ISC_READER
 void load_dhcp(char *file, char *suffix, time_t now, char *hostname);
 #endif
+

src/forward.c

@@ -40,7 +40,6 @@ static void send_from(int fd, int nowild, char *packet, int len,
 {
   struct msghdr msg;
   struct iovec iov[1]; 
-  struct cmsghdr *cmptr;
   union {
     struct cmsghdr align; /* this ensures alignment */
 #if defined(IP_PKTINFO)
@@ -56,60 +55,139 @@ static void send_from(int fd, int nowild, char *packet, int len,
   iov[0].iov_base = packet;
   iov[0].iov_len = len;
 
-  if (nowild)
+  msg.msg_control = NULL;
-    {
+  msg.msg_controllen = 0;
-      msg.msg_control = NULL;
-      msg.msg_controllen = 0;
-      }
-  else
-    {
-      msg.msg_control = &control_u;
-      msg.msg_controllen = sizeof(control_u);
-    }
   msg.msg_flags = 0;
   msg.msg_name = to;
   msg.msg_namelen = sa_len(to);
   msg.msg_iov = iov;
   msg.msg_iovlen = 1;
   
-  cmptr = CMSG_FIRSTHDR(&msg);
+  if (!nowild && to->sa.sa_family == AF_INET)
-
+    {
+      msg.msg_control = &control_u;
+      msg.msg_controllen = sizeof(control_u);
+      {
+	struct cmsghdr *cmptr = CMSG_FIRSTHDR(&msg);
 #if defined(IP_PKTINFO)
-  if (!nowild && to->sa.sa_family == AF_INET)
+	struct in_pktinfo *pkt = (struct in_pktinfo *)CMSG_DATA(cmptr);
-    {
+	pkt->ipi_ifindex = 0;
-      struct in_pktinfo *pkt = (struct in_pktinfo *)CMSG_DATA(cmptr);
+	pkt->ipi_spec_dst = source->addr.addr4;
-      pkt->ipi_ifindex = 0;
+	msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
-      pkt->ipi_spec_dst = source->addr.addr4;
+	cmptr->cmsg_level = SOL_IP;
-      msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
+	cmptr->cmsg_type = IP_PKTINFO;
-      cmptr->cmsg_level = SOL_IP;
-      cmptr->cmsg_type = IP_PKTINFO;
-    }
 #elif defined(IP_SENDSRCADDR)
-  if (!nowild && to->sa.sa_family == AF_INET)
+	struct in_addr *a = (struct in_addr *)CMSG_DATA(cmptr);
-    {
+	*a = source->addr.addr4;
-      struct in_addr *a = (struct in_addr *)CMSG_DATA(cmptr);
+	msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
-      *a = source->addr.addr4;
+	cmptr->cmsg_level = IPPROTO_IP;
-      msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
+	cmptr->cmsg_type = IP_SENDSRCADDR;
-      cmptr->cmsg_level = IPPROTO_IP;
-      cmptr->cmsg_type = IP_SENDSRCADDR;
-    }
 #endif
+      }
+    }
 
 #ifdef HAVE_IPV6
-  if (!nowild && to->sa.sa_family == AF_INET6)
+  if (to->sa.sa_family == AF_INET6)
     {
-      struct in6_pktinfo *pkt = (struct in6_pktinfo *)CMSG_DATA(cmptr);
+      msg.msg_control = &control_u;
-      pkt->ipi6_ifindex = 0;
+      msg.msg_controllen = sizeof(control_u);
-      pkt->ipi6_addr = source->addr.addr6;
+      {
-      msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+	struct cmsghdr *cmptr = CMSG_FIRSTHDR(&msg);
-      cmptr->cmsg_type = IPV6_PKTINFO;
+	struct in6_pktinfo *pkt = (struct in6_pktinfo *)CMSG_DATA(cmptr);
-      cmptr->cmsg_level = IPV6_LEVEL;
+	pkt->ipi6_ifindex = 0;
+	pkt->ipi6_addr = source->addr.addr6;
+	msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+	cmptr->cmsg_type = IPV6_PKTINFO;
+	cmptr->cmsg_level = IPV6_LEVEL;
+      }
     }
 #endif
   
-  sendmsg(fd, &msg, 0);
+  /* certain Linux kernels seem to object to setting the source address in the IPv6 stack
+     by returning EINVAL from sendmsg. In that case, try again without setting the
+     source address, since it will nearly alway be correct anyway.  IPv6 stinks. */
+  if (sendmsg(fd, &msg, 0) == -1 && errno == EINVAL)
+    {
+      msg.msg_controllen = 0;
+      sendmsg(fd, &msg, 0);
+    }
 }
           
+unsigned short search_servers(struct server *servers, unsigned int options, struct all_addr **addrpp,
+			      unsigned short qtype, char *qdomain, int *type, char **domain)
+			      
+{
+  /* If the query ends in the domain in one of our servers, set
+     domain to point to that name. We find the largest match to allow both
+     domain.org and sub.domain.org to exist. */
+  
+  unsigned int namelen = strlen(qdomain);
+  unsigned int matchlen = 0;
+  struct server *serv;
+  unsigned short flags = 0;
+  
+  for (serv=servers; serv; serv=serv->next)
+    /* domain matches take priority over NODOTS matches */
+    if ((serv->flags & SERV_FOR_NODOTS) && *type != SERV_HAS_DOMAIN && !strchr(qdomain, '.'))
+      {
+	unsigned short sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6; 
+	*type = SERV_FOR_NODOTS;
+	flags = 0;
+	if (serv->flags & SERV_NO_ADDR)
+	  flags = F_NOERR; 
+	else if ((serv->flags & SERV_LITERAL_ADDRESS) && (sflag & qtype))
+	  {
+	    flags = sflag;
+	    if (serv->addr.sa.sa_family == AF_INET) 
+	      *addrpp = (struct all_addr *)&serv->addr.in.sin_addr;
+#ifdef HAVE_IPV6
+	    else
+	      *addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr;
+#endif 
+	  }
+      }
+    else if (serv->flags & SERV_HAS_DOMAIN)
+      {
+	unsigned int domainlen = strlen(serv->domain);
+	if (namelen >= domainlen &&
+	    hostname_isequal(qdomain + namelen - domainlen, serv->domain) &&
+	    domainlen >= matchlen)
+	  {
+	    unsigned short sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6;
+	    *type = SERV_HAS_DOMAIN;
+	    *domain = serv->domain;
+	    matchlen = domainlen;
+	    flags = 0;
+	    if (serv->flags & SERV_NO_ADDR)
+	      flags = F_NOERR; 
+	    else if ((serv->flags & SERV_LITERAL_ADDRESS) && ((sflag | F_QUERY ) & qtype))
+	      {
+		flags = qtype;
+		if (serv->addr.sa.sa_family == AF_INET) 
+		  *addrpp = (struct all_addr *)&serv->addr.in.sin_addr;
+#ifdef HAVE_IPV6
+		else
+		  *addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr;
+#endif
+	      }
+	  } 
+      }
+
+  if (flags & ~F_NOERR) /* flags set here means a literal found */
+    {
+      if (flags & F_QUERY)
+	log_query(F_CONFIG | F_FORWARD | F_NEG, qdomain, NULL);
+      else
+	log_query(F_CONFIG | F_FORWARD | flags, qdomain, *addrpp);
+    }
+  else if (qtype && (options & OPT_NODOTS_LOCAL) && !strchr(qdomain, '.'))
+    flags = F_NXDOMAIN;
+
+  if (flags & (F_NOERR | F_NXDOMAIN))
+    log_query(F_CONFIG | F_FORWARD | F_NEG | qtype | (flags & F_NXDOMAIN), qdomain, NULL);
+
+  return  flags;
+}
 
 /* returns new last_server */	
 static struct server *forward_query(int udpfd, union mysockaddr *udpaddr, 
@@ -146,75 +224,11 @@ static struct server *forward_query(int udpfd, union mysockaddr *udpaddr,
   else 
     {
       if (gotname)
-	{
+	flags = search_servers(servers, options, &addrp, gotname, dnamebuff, &type, &domain);
-	  /* If the query ends in the domain in one of our servers, set
-	     domain to point to that name. We find the largest match to allow both
-	     domain.org and sub.domain.org to exist. */
       
-	  unsigned int namelen = strlen(dnamebuff);
+      if (!flags && !(forward = get_new_frec(now)))
-	  unsigned int matchlen = 0;
+	/* table full - server failure. */
-	  struct server *serv;
+	flags = F_NEG;
-
-	  for (serv=servers; serv; serv=serv->next)
-	    /* domain matches take priority over NODOTS matches */
-	    if ((serv->flags & SERV_FOR_NODOTS) && type != SERV_HAS_DOMAIN && !strchr(dnamebuff, '.'))
-	      {
-		unsigned short sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6; 
-		type = SERV_FOR_NODOTS;
-		flags = 0;
-		if ((serv->flags & SERV_LITERAL_ADDRESS) && (sflag & gotname))
-		  {
-		    flags = sflag;
-		    if (serv->addr.sa.sa_family == AF_INET) 
-		      addrp = (struct all_addr *)&serv->addr.in.sin_addr;
-#ifdef HAVE_IPV6
-		    else
-		      addrp = (struct all_addr *)&serv->addr.in6.sin6_addr;
-#endif 
-		  }
-	      }
-	    else if (serv->flags & SERV_HAS_DOMAIN)
-	      {
-		unsigned int domainlen = strlen(serv->domain);
-		if (namelen >= domainlen &&
-		    hostname_isequal(dnamebuff + namelen - domainlen, serv->domain) &&
-		    domainlen >= matchlen)
-		  {
-		    unsigned short sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6;
-		    type = SERV_HAS_DOMAIN;
-		    domain = serv->domain;
-		    matchlen = domainlen;
-		    flags = 0;
-		    if ((serv->flags & SERV_LITERAL_ADDRESS) && ((sflag | F_QUERY ) & gotname))
-		      {
-			flags = gotname;
-			if (serv->addr.sa.sa_family == AF_INET) 
-			  addrp = (struct all_addr *)&serv->addr.in.sin_addr;
-#ifdef HAVE_IPV6
-			else
-			  addrp = (struct all_addr *)&serv->addr.in6.sin6_addr;
-#endif
-		      }
-		  } 
-	      }
-	}
-      
-      if (flags) /* flags set here means a literal found */
-	{
-	  if (flags & F_QUERY)
-	    log_query(F_CONFIG | F_FORWARD | F_NEG, dnamebuff, NULL);
-	  else
-	    log_query(F_CONFIG | F_FORWARD | flags, dnamebuff, addrp);
-	}
-      else
-	{
-	  /* we may by policy not forward names without a domain part */
-	  if (gotname && (options & OPT_NODOTS_LOCAL) && !strchr(dnamebuff, '.'))
-	    flags = F_NXDOMAIN;
-	  else if (!(forward = get_new_frec(now)))
-	    /* table full - server failure. */
-	    flags = F_NEG;
-	}
       
       if (forward)
 	{
@@ -257,12 +271,10 @@ static struct server *forward_query(int udpfd, union mysockaddr *udpaddr,
 	  if (type == (start->flags & SERV_TYPE) &&
 	      (type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)))
 	    {
-	      if (start->flags & SERV_NO_ADDR)
+	      if (!(start->flags & SERV_LITERAL_ADDRESS) &&
-		flags = F_NOERR; /* NULL servers are OK. */
+		  sendto(start->sfd->fd, (char *)header, plen, 0,
-	      else if (!(start->flags & SERV_LITERAL_ADDRESS) &&
+			 &start->addr.sa,
-		       sendto(start->sfd->fd, (char *)header, plen, 0,
+			 sa_len(&start->addr)) != -1)
-			      &start->addr.sa,
-			      sa_len(&start->addr)) != -1)
 		{
 		  if (!gotname)
 		    strcpy(dnamebuff, "query");
@@ -282,7 +294,7 @@ static struct server *forward_query(int udpfd, union mysockaddr *udpaddr,
 	    } 
 	  
 	  if (!(start = start->next))
-	    start = servers;
+ 	    start = servers;
 	  
 	  if (start == firstsentto)
 	    break;
@@ -300,16 +312,65 @@ static struct server *forward_query(int udpfd, union mysockaddr *udpaddr,
   plen = setup_reply(header, (unsigned int)plen, addrp, flags, local_ttl);
   send_from(udpfd, options & OPT_NOWILD, (char *)header, plen, udpaddr, dst_addr);
   
-  if (flags & (F_NOERR | F_NXDOMAIN))
-    log_query(F_CONFIG | F_FORWARD | F_NEG | gotname | (flags & F_NXDOMAIN), dnamebuff, NULL);
-  
   return last_server;
 }
 
+static int process_reply(HEADER *header, time_t now, char *dnamebuff, struct bogus_addr *bogus_nxdomain, 
+			 struct doctor *doctors, union mysockaddr *serveraddr, 
+			 int n, int options, unsigned short edns_pcktsz)
+{
+  unsigned char *pheader;
+   
+  /* If upstream is advertising a larger UDP packet size
+	 than we allow, trim it so that we don't get overlarge
+	 requests for the client. */
+
+  if ((pheader = find_pseudoheader(header, n)))
+    {
+      unsigned short udpsz;
+      unsigned char *psave = pheader;
+      
+      GETSHORT(udpsz, pheader);
+      if (udpsz > edns_pcktsz)
+	PUTSHORT(edns_pcktsz, psave);
+    }
+
+  /* Complain loudly if the upstream server is non-recursive. */
+  if (!header->ra && header->rcode == NOERROR && ntohs(header->ancount) == 0)
+    {
+      char addrbuff[ADDRSTRLEN];
+#ifdef HAVE_IPV6
+      if (serveraddr->sa.sa_family == AF_INET)
+	inet_ntop(AF_INET, &serveraddr->in.sin_addr, addrbuff, ADDRSTRLEN);
+      else if (serveraddr->sa.sa_family == AF_INET6)
+	inet_ntop(AF_INET6, &serveraddr->in6.sin6_addr, addrbuff, ADDRSTRLEN);
+#else
+      strcpy(addrbuff, inet_ntoa(serveraddr->in.sin_addr));
+#endif
+      syslog(LOG_WARNING, "nameserver %s refused to do a recursive query", addrbuff);
+      return 0;
+    }
+  
+  if ((header->rcode == NOERROR || header->rcode == NXDOMAIN) && header->opcode == QUERY)
+    {
+      if (!(bogus_nxdomain && 
+	    header->rcode == NOERROR && 
+	    check_for_bogus_wildcard(header, (unsigned int)n, dnamebuff, bogus_nxdomain, now)))
+	{
+	  if (header->rcode == NOERROR && ntohs(header->ancount) != 0)
+	    extract_addresses(header, (unsigned int)n, dnamebuff, now, doctors);
+	  else if (!(options & OPT_NO_NEG))
+	    extract_neg_addrs(header, (unsigned int)n, dnamebuff, now);
+	}
+    }
+  
+  return 1;
+}
+
 /* returns new last_server */
 struct server *reply_query(struct serverfd *sfd, int options, char *packet, time_t now,
 			   char *dnamebuff, struct server *servers, struct server *last_server,
-			   struct bogus_addr *bogus_nxdomain, struct doctor *doctors)
+			   struct bogus_addr *bogus_nxdomain, struct doctor *doctors, unsigned short edns_pcktsz)
 {
   /* packet from peer server, extract data for cache, and send to
      original requester */
@@ -317,7 +378,7 @@ struct server *reply_query(struct serverfd *sfd, int options, char *packet, time
   HEADER *header;
   union mysockaddr serveraddr;
   socklen_t addrlen = sizeof(serveraddr);
-  int n = recvfrom(sfd->fd, packet, PACKETSZ, 0, &serveraddr.sa, &addrlen);
+  int n = recvfrom(sfd->fd, packet, edns_pcktsz, 0, &serveraddr.sa, &addrlen);
   
   /* Determine the address of the server replying  so that we can mark that as good */
   serveraddr.sa.sa_family = sfd->source_addr.sa.sa_family;
@@ -340,40 +401,10 @@ struct server *reply_query(struct serverfd *sfd, int options, char *packet, time
 	    last_server = forward->sentto;
 	}
       
-      /* Complain loudly if the upstream server is non-recursive. */
+      if (!process_reply(header, now, dnamebuff, bogus_nxdomain, doctors, &serveraddr, n, options, edns_pcktsz))
-      if (!header->ra && header->rcode == NOERROR && ntohs(header->ancount) == 0)
+	return NULL;
-	{
-	  char addrbuff[ADDRSTRLEN];
-#ifdef HAVE_IPV6
-          if (serveraddr.sa.sa_family == AF_INET)
-	    inet_ntop(AF_INET, &serveraddr.in.sin_addr, addrbuff, ADDRSTRLEN);
-	  else if (serveraddr.sa.sa_family == AF_INET6)
-	    inet_ntop(AF_INET6, &serveraddr.in6.sin6_addr, addrbuff, ADDRSTRLEN);
-#else
-          strcpy(addrbuff, inet_ntoa(serveraddr.in.sin_addr));
-#endif
-	  syslog(LOG_WARNING, "nameserver %s refused to do a recursive query", addrbuff);
-	  return NULL;
-	}
-      
-      if ((header->rcode == NOERROR || header->rcode == NXDOMAIN) && header->opcode == QUERY)
-	{
-	  if (!(bogus_nxdomain && 
-		header->rcode == NOERROR && 
-		check_for_bogus_wildcard(header, (unsigned int)n, dnamebuff, bogus_nxdomain, now)))
-	    {
-	      if (header->rcode == NOERROR && ntohs(header->ancount) != 0)
-		extract_addresses(header, (unsigned int)n, dnamebuff, now, doctors);
-	      else if (!(options & OPT_NO_NEG))
-		extract_neg_addrs(header, (unsigned int)n, dnamebuff, now);
-	    }
-	}
       
       header->id = htons(forward->orig_id);
-      /* There's no point returning an upstream reply marked as truncated,
-	 since that will prod the resolver into moving to TCP - which we
-	 don't support. */
-      header->tc = 0; /* goodbye truncate */
       send_from(forward->fd, options & OPT_NOWILD, packet, n, &forward->source, &forward->dest);
       forward->new_id = 0; /* cancel */
     }
@@ -385,12 +416,13 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
 			     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)
+			     struct server *last_server, struct server *servers, unsigned short edns_pcktsz)
 {
   HEADER *header = (HEADER *)packet;
   union mysockaddr source_addr;
   struct iname *tmp;
   struct all_addr dst_addr;
+  int check_dst = !(options & OPT_NOWILD);
   int m, n, if_index = 0;
   struct iovec iov[1];
   struct msghdr msg;
@@ -409,7 +441,7 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
   } control_u;
   
   iov[0].iov_base = packet;
-  iov[0].iov_len = PACKETSZ;
+  iov[0].iov_len = edns_pcktsz;
     
   msg.msg_control = control_u.control;
   msg.msg_controllen = sizeof(control_u);
@@ -425,14 +457,17 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
   source_addr.sa.sa_family = listen->family;
 #ifdef HAVE_IPV6
   if (listen->family == AF_INET6)
-    source_addr.in6.sin6_flowinfo = htonl(0);
+    {
+      check_dst = 1;
+      source_addr.in6.sin6_flowinfo = htonl(0);
+    }
 #endif
   
-  if (!(options & OPT_NOWILD) && msg.msg_controllen < sizeof(struct cmsghdr))
+  if (check_dst && msg.msg_controllen < sizeof(struct cmsghdr))
     return last_server;
 
 #if defined(IP_PKTINFO)
-  if (!(options & OPT_NOWILD) && listen->family == AF_INET)
+  if (check_dst && listen->family == AF_INET)
     for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
       if (cmptr->cmsg_level == SOL_IP && cmptr->cmsg_type == IP_PKTINFO)
 	{
@@ -440,7 +475,7 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
 	  if_index = ((struct in_pktinfo *)CMSG_DATA(cmptr))->ipi_ifindex;
 	}
 #elif defined(IP_RECVDSTADDR) && defined(IP_RECVIF)
-  if (!(options & OPT_NOWILD) && listen->family == AF_INET)
+  if (check_dst && listen->family == AF_INET)
     {
       for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
 	if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_RECVDSTADDR)
@@ -451,7 +486,7 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
 #endif
 
 #ifdef HAVE_IPV6
-  if (!(options & OPT_NOWILD) && listen->family == AF_INET6)
+  if (listen->family == AF_INET6)
     {
       for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
 	if (cmptr->cmsg_level == IPV6_LEVEL && cmptr->cmsg_type == IPV6_PKTINFO)
@@ -466,7 +501,7 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
     return last_server;
   
   /* enforce available interface configuration */
-  if (!(options & OPT_NOWILD))
+  if (check_dst)
     {
       struct ifreq ifr;
 
@@ -527,7 +562,7 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
     }
 
   m = answer_request (header, ((char *) header) + PACKETSZ, (unsigned int)n, 
-		      mxnames, mxtarget, options, now, local_ttl, namebuff);
+		      mxnames, mxtarget, options, now, local_ttl, namebuff, edns_pcktsz);
   if (m >= 1)
     send_from(listen->fd, options & OPT_NOWILD, (char *)header, m, &source_addr, &dst_addr);
   else
@@ -537,6 +572,194 @@ struct server *receive_query(struct listener *listen, char *packet, struct mx_re
   return last_server;
 }
 
+static int read_write(int fd, char *packet, int size, int rw)
+{
+  int n, done;
+  
+  for (done = 0; done < size; done += n)
+    {
+    retry:
+      if (rw)
+	n = read(fd, &packet[done], (size_t)(size - done));
+      else
+	n = write(fd, &packet[done], (size_t)(size - done));
+
+      if (n == 0)
+	return 0;
+      else if (n == -1)
+	{
+	  if (errno == EINTR)
+	    goto retry;
+	  else if (errno == EAGAIN)
+	    {
+	      struct timespec waiter;
+	      waiter.tv_sec = 0;
+	      waiter.tv_nsec = 10000;
+	      nanosleep(&waiter, NULL);
+	      goto retry;
+	    }
+	  else
+	    return 0;
+	}
+    }
+  return 1;
+}
+  
+/* The daemon forks before calling this: it should deal with one connection,
+   blocking as neccessary, and then return. Note, need to be a bit careful
+   about resources for debug mode, when the fork is suppressed: that's
+   done by the caller. */
+char *tcp_request(int confd, struct mx_record *mxnames, 
+		  char *mxtarget, unsigned int options, time_t now, 
+		  unsigned long local_ttl, char *namebuff,
+		  struct server *last_server, struct server *servers,
+		  struct bogus_addr *bogus_nxdomain, struct doctor *doctors,
+		  unsigned short edns_pktsz)
+{
+  int size = 0, m;
+  unsigned char c1, c2;
+  /* Max TCP packet + slop */
+  char *packet = malloc(65536 + MAXDNAME + RRFIXEDSZ);
+  HEADER *header;
+
+  while (1)
+    {
+      if (!packet ||
+	  !read_write(confd, &c1, 1, 1) || !read_write(confd, &c2, 1, 1) ||
+	  !(size = c1 << 8 | c2) ||
+	  !read_write(confd, packet, size, 1))
+       	return packet; 
+  
+      if (size < (int)sizeof(HEADER))
+	continue;
+      
+      header = (HEADER *)packet;
+      
+      if (extract_request(header, (unsigned int)size, namebuff))
+	{
+	  union mysockaddr peer_addr;
+	  socklen_t peer_len = sizeof(union mysockaddr);
+	  
+	  if (getpeername(confd, (struct sockaddr *)&peer_addr, &peer_len) != -1)
+	    {
+	      if (peer_addr.sa.sa_family == AF_INET) 
+		log_query(F_QUERY | F_IPV4 | F_FORWARD, namebuff, 
+			  (struct all_addr *)&peer_addr.in.sin_addr);
+#ifdef HAVE_IPV6
+	      else
+		log_query(F_QUERY | F_IPV6 | F_FORWARD, namebuff, 
+			  (struct all_addr *)&peer_addr.in6.sin6_addr);
+#endif
+	    }
+	}
+      
+      /* m > 0 if answered from cache */
+      m = answer_request (header, ((char *) header) + 65536, (unsigned int)size,
+			  mxnames, mxtarget, options, now, local_ttl, namebuff, edns_pktsz);
+      
+      if (m == 0)
+	{
+	  unsigned short flags = 0;
+	  unsigned short gotname = extract_request(header, (unsigned int)size, namebuff);
+	  struct all_addr *addrp = NULL;
+	  int type = 0;
+	  char *domain = NULL;
+	  
+	  if (gotname)
+	    flags = search_servers(servers, options, &addrp, gotname, namebuff, &type, &domain);
+	  
+	  if (type != 0  || (options & OPT_ORDER) || !last_server)
+	    last_server = servers;
+      
+	  if (!flags && last_server)
+	    {
+	      struct server *firstsendto = NULL;
+	      
+	      /* Loop round available servers until we succeed in connecting to one.
+	         Note that this code subtley ensures that consecutive queries on this connection
+	         which can go to the same server, do so. */
+	      while (1) 
+		{
+		  if (!firstsendto)
+		    firstsendto = last_server;
+		  else
+		    {
+		      if (!(last_server = last_server->next))
+			last_server = servers;
+		      
+		      if (last_server == firstsendto)
+			break;
+		    }
+	      
+		  /* server for wrong domain */
+		  if (type != (last_server->flags & SERV_TYPE) ||
+		      (type == SERV_HAS_DOMAIN && !hostname_isequal(domain, last_server->domain)))
+		    continue;
+		  
+		  if ((last_server->tcpfd == -1) &&
+		      (last_server->tcpfd = socket(last_server->addr.sa.sa_family, SOCK_STREAM, 0)) != -1 &&
+		      connect(last_server->tcpfd, &last_server->addr.sa, sa_len(&last_server->addr)) == -1)
+		    {
+		      close(last_server->tcpfd);
+		      last_server->tcpfd = -1;
+		    }
+		  
+		  if (last_server->tcpfd == -1)	
+		    continue;
+		  
+		  c1 = size >> 8;
+		  c2 = size;
+		  
+		  if (!read_write(last_server->tcpfd, &c1, 1, 0) ||
+		      !read_write(last_server->tcpfd, &c2, 1, 0) ||
+		      !read_write(last_server->tcpfd, packet, size, 0) ||
+		      !read_write(last_server->tcpfd, &c1, 1, 1) ||
+		      !read_write(last_server->tcpfd, &c2, 1, 1))
+		    {
+		      close(last_server->tcpfd);
+		      last_server->tcpfd = -1;
+		      continue;
+		    } 
+	      
+		  m = (c1 << 8) | c2;
+		  if (!read_write(last_server->tcpfd, packet, m, 1))
+		    return packet;
+		  
+		  if (!gotname)
+		    strcpy(namebuff, "query");
+		  if (last_server->addr.sa.sa_family == AF_INET)
+		    log_query(F_SERVER | F_IPV4 | F_FORWARD, namebuff, 
+			      (struct all_addr *)&last_server->addr.in.sin_addr); 
+#ifdef HAVE_IPV6
+		  else
+		    log_query(F_SERVER | F_IPV6 | F_FORWARD, namebuff, 
+			      (struct all_addr *)&last_server->addr.in6.sin6_addr);
+#endif 
+		  
+		  /* There's no point in updating the cache, since this process will exit and
+		     lose the information after one query. We make this call for the alias and 
+		     bogus-nxdomain side-effects. */
+		  process_reply(header, now, namebuff, bogus_nxdomain, doctors, 
+				&last_server->addr, m, options, edns_pktsz);
+		  
+		  break;
+		}
+	    }
+	  
+	  /* In case of local answer or no connections made. */
+	  if (m == 0)
+	    m = setup_reply(header, (unsigned int)size, addrp, flags, local_ttl);
+	}
+      
+      c1 = m>>8;
+      c2 = m;
+      if (!read_write(confd, &c1, 1, 0) ||
+	  !read_write(confd, &c2, 1, 0) || 
+	  !read_write(confd, packet, m, 0))
+	return packet;
+    }
+}
+
 static struct frec *get_new_frec(time_t now)
 {
   struct frec *f = frec_list, *oldest = NULL;
@@ -603,7 +826,7 @@ static struct frec *lookup_frec(unsigned short id)
 static struct frec *lookup_frec_by_sender(unsigned short id,
 					  union mysockaddr *addr)
 {
-   struct frec *f;
+  struct frec *f;
   
   for(f = frec_list; f; f = f->next)
     if (f->new_id &&

src/lease.c

@@ -220,9 +220,6 @@ 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)
@@ -235,8 +232,7 @@ struct dhcp_lease *lease_find_by_client(unsigned char *clid, int clid_len)
   else
     {
       for (lease = leases; lease; lease = lease->next)	
-	if (!lease->clid &&
+	if (memcmp(clid, lease->hwaddr, ETHER_ADDR_LEN) == 0)
-	    memcmp(clid, lease->hwaddr, ETHER_ADDR_LEN) == 0)
 	  return lease;
     }
   

src/network.c

@@ -25,7 +25,11 @@ static struct irec *add_iface(struct irec *list, char *name, union mysockaddr *a
   if (except)
     for (tmp = except; tmp; tmp = tmp->next)
       if (tmp->name && strcmp(tmp->name, name) == 0)
-	return list;
+	{
+	  /* record address of named interfaces, for TCP access control */
+	  tmp->addr = *addr;
+	  return list;
+	}
 
   /* we may need to check the whitelist */
   if (names || addrs)
@@ -34,7 +38,10 @@ static struct irec *add_iface(struct irec *list, char *name, union mysockaddr *a
 
       for (tmp = names; tmp; tmp = tmp->next)
 	if (tmp->name && (strcmp(tmp->name, name) == 0))
-	  found = tmp->used = 1;
+	  {
+	    tmp->addr = *addr;
+	    found = tmp->used = 1;
+	  }
 
       for (tmp = addrs; tmp; tmp = tmp->next)
 	if (sockaddr_isequal(&tmp->addr, addr))
@@ -220,46 +227,14 @@ 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)
 {
-#if !(defined(IP_PKTINFO) || (defined(IP_RECVDSTADDR) && defined(IP_RECVIF) && defined(IP_SENDSRCADDR)))
-  return NULL;
-#else
   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)
-    {
-      free(listen);
-      return 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)
-    {
-      close(listen->fd);
-      free(listen);
-      return 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);
@@ -267,65 +242,148 @@ 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)
+    return (errno == EPROTONOSUPPORT ||
+	    errno == EAFNOSUPPORT ||
+	    errno == EINVAL);
+  
+  if ((tcpfd = socket(AF_INET6, SOCK_STREAM, 0)) == -1)
     {
-      if (errno != EPROTONOSUPPORT &&
+      save = errno;
-	  errno != EAFNOSUPPORT &&
+      close(fd);
-	  errno != EINVAL)
+      errno = save;
-	{
+      return 0;
-	  close(listen->fd);
-	  free(listen);
-	  return NULL;
-	}
     }
-  else
+  
+  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(tcpfd, F_GETFL, 0)) == -1 ||
+      fcntl(tcpfd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+      setsockopt(fd, IPV6_LEVEL, IPV6_PKTINFO, &opt, sizeof(opt)) == -1 ||
+      bind(tcpfd, (struct sockaddr *)&addr, sa_len(&addr)) == -1 ||
+      listen(tcpfd, 5) == -1 ||
+      bind(fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1) 
     {
-      listen->next = safe_malloc(sizeof(struct listener));
+      save = errno;
-      listen->next->fd = fd;
+      close(fd);
-      listen->next->family = AF_INET6;
+      close(tcpfd);
-      listen->next->next = NULL;
+      errno = save;
-      if (setsockopt(listen->next->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+      return 0;
-	  setsockopt(listen->next->fd, IPV6_LEVEL, IPV6_PKTINFO, &opt, sizeof(opt)) == -1 ||
-	  bind(listen->next->fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
-	{
-	  close(listen->next->fd);
-	  free(listen->next);
-	  close(listen->fd);
-	  free(listen);
-	  return NULL;
-	}
     }
+  
+  l = safe_malloc(sizeof(struct listener));
+  l->fd = fd;
+  l->tcpfd = tcpfd;
+  l->family = AF_INET6;
+  l->next = NULL;
+  *link = l;
+  
+  return 1;
+}
 #endif
 
-  return listen;
+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 ||
+#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;
+  
+  /* Create bound listeners only for IPv4, IPv6 always binds the wildcard */
+
+#ifdef HAVE_IPV6
+  if (!create_ipv6_listener(&listeners, port))
+    die("failed to to create listening socket: %s", NULL);
+#endif
 
   for (iface = interfaces ;iface; iface = iface->next)
-    {
+    if (iface->addr.sa.sa_family == AF_INET)
-      struct listener *new = safe_malloc(sizeof(struct listener));
+      {
-      new->family = iface->addr.sa.sa_family;
+	struct listener *new = safe_malloc(sizeof(struct listener));
-      new->next = listeners;
+	new->family = iface->addr.sa.sa_family;
-      listeners = new;
+	new->next = listeners;
-      if ((new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1)
+	listeners = new;
-	die("failed to create socket: %s", NULL);
+	if ((new->tcpfd = socket(iface->addr.sa.sa_family, SOCK_STREAM, 0)) == -1 ||
-      if (setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+	    (new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1 ||
-	  bind(new->fd, &iface->addr.sa, sa_len(&iface->addr)) == -1)
+	    setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
-	die("failed to bind socket: %s", NULL);
+	    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 ||
+	    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 to create 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;
   

src/option.c

@@ -21,7 +21,7 @@ struct myoption {
   int val;
 };
 
-#define OPTSTRING "ZDNLERzowefnbvhdqr:m:p:c:l:s:i:t:u:g:a:x:S:C:A:T:H:Q:I:B:F:G:O:M:X:V:U:j:"
+#define OPTSTRING "ZDNLERzowefnbvhdqr:m:p:c:l:s:i:t:u:g:a:x:S:C:A:T:H:Q:I:B:F:G:O:M:X:V:U:j:P:"
 
 static struct myoption opts[] = { 
   {"version", 0, 0, 'v'},
@@ -72,6 +72,7 @@ static struct myoption opts[] = {
   {"alias", 1, 0, 'V' },
   {"dhcp-vendorclass", 1, 0, 'U'},
   {"dhcp-userclass", 1, 0, 'j'},
+  {"edns-packet-max", 1, 0, 'P'},
   {0, 0, 0, 0}
 };
 
@@ -132,6 +133,7 @@ static char *usage =
 "-o, --strict-order                  Use nameservers strictly in the order given in " RESOLVFILE ".\n"
 "-O, --dhcp-option=<optspec>         Set extra options to be set to DHCP clients.\n"
 "-p, --port=number                   Specify port to listen for DNS requests on (defaults to 53).\n"
+"-P, --edns-packet-max=<size>        Maximum supported UDP packet size for EDNS.0 (defaults to %d).\n"
 "-q, --log-queries                   Log queries.\n"
 "-Q, --query-port=number             Force the originating port for upstream queries.\n"
 "-R, --no-resolv                     Do NOT read resolv.conf.\n"
@@ -143,7 +145,7 @@ static char *usage =
 "-T, --local-ttl=time                Specify time-to-live in seconds for replies from /etc/hosts.\n"
 "-u, --user=username                 Change to this user after startup. (defaults to " CHUSER ").\n" 
 "-U, --dhcp-vendorclass=<id>,<class> Map DHCP vendor class to option set.\n"
-"-v, --version                       Display dnsmasq version.\n"
+"-v, --version                       Display dnsmasq version and copyright information.\n"
 "-V, --alias=addr,addr,mask          Translate IPv4 addresses from upstream servers.\n"
 "-w, --help                          Display this message.\n"
 "-x, --pid-file=path                 Specify path of PID file. (defaults to " RUNFILE ").\n"
@@ -161,7 +163,7 @@ unsigned int read_opts (int argc, char **argv, char *buff, struct resolvc **reso
 			int *query_port, unsigned long *local_ttl, char **addn_hosts, struct dhcp_context **dhcp,
 			struct dhcp_config **dhcp_conf, struct dhcp_opt **dhcp_opts, struct dhcp_vendor **dhcp_vendors, char **dhcp_file,
 			char **dhcp_sname, struct in_addr *dhcp_next_server, int *dhcp_max, 
-			unsigned int *min_leasetime, struct doctor **doctors)
+			unsigned int *min_leasetime, struct doctor **doctors, unsigned short *edns_pktsz)
 {
   int option = 0, i;
   unsigned int flags = 0;
@@ -256,13 +258,16 @@ unsigned int read_opts (int argc, char **argv, char *buff, struct resolvc **reso
      
       if (!f && option == 'w')
 	{
-	  fprintf (stderr, usage,  CACHESIZ, MAXLEASES);
+	  fprintf (stderr, usage,  CACHESIZ, EDNS_PKTSZ, MAXLEASES);
 	  exit(0);
 	}
 
       if (!f && option == 'v')
         {
-          fprintf(stderr, "dnsmasq version %s\n", VERSION);
+          fprintf(stderr, "Dnsmasq version %s  %s\n\n", VERSION, COPYRIGHT);
+	  fprintf(stderr, "This software comes with ABSOLUTELY NO WARRANTY.\n");
+	  fprintf(stderr, "Dnsmasq is free software, and you are welcome to redistribute it\n");
+	  fprintf(stderr, "under the terms of the GNU General Public License, version 2.\n");
           exit(0);
         }
       
@@ -658,6 +663,15 @@ unsigned int read_opts (int argc, char **argv, char *buff, struct resolvc **reso
 		option = '?';
 	      break;
 	      
+	    case 'P':
+	      {
+		int i;
+		if (!atoi_check(optarg, &i))
+		  option = '?';
+		*edns_pktsz = (unsigned short)i;	
+		break;
+	      }
+
 	    case 'Q':
 	      if (!atoi_check(optarg, query_port))
 		option = '?';
@@ -686,6 +700,7 @@ unsigned int read_opts (int argc, char **argv, char *buff, struct resolvc **reso
 		
 		new->next = *dhcp;
 		new->lease_time = DEFLEASE;
+		new->addr_epoch = 0;
 		new->netmask.s_addr = 0;
 		new->broadcast.s_addr = 0;
 		new->netid.net = NULL;

src/rfc1035.c

@@ -244,52 +244,60 @@ static int in_arpa_name_2_addr(char *namein, struct all_addr *addrp)
   return 0;
 }
 
+static unsigned char *skip_name(unsigned char *ansp, HEADER *header, unsigned int plen)
+{
+  while(1)
+    {
+      unsigned int label_type = (*ansp) & 0xc0;
+      
+      if ((unsigned int)(ansp - (unsigned char *)header) >= plen)
+	return NULL;
+      
+      if (label_type == 0xc0)
+	{
+	  /* pointer for compression. */
+	  ansp += 2;	
+	  break;
+	}
+      else if (label_type == 0x80)
+	return NULL; /* reserved */
+      else if (label_type == 0x40)
+	{
+	  /* Extended label type */
+	  unsigned int count;
+	  
+	  if (((*ansp++) & 0x3f) != 1)
+	    return NULL; /* we only understand bitstrings */
+	  
+	  count = *(ansp++); /* Bits in bitstring */
+	  
+	  if (count == 0) /* count == 0 means 256 bits */
+	    ansp += 32;
+	  else
+	    ansp += ((count-1)>>3)+1;
+	}
+      else
+	{ /* label type == 0 Bottom six bits is length */
+	  unsigned int len = (*ansp++) & 0x3f;
+	  if (len == 0)
+	    break; /* zero length label marks the end. */
+	  
+	  ansp += len;
+	}
+    }
+  
+  return ansp;
+}
+
 static unsigned char *skip_questions(HEADER *header, unsigned int plen)
 {
   int q, qdcount = ntohs(header->qdcount);
   unsigned char *ansp = (unsigned char *)(header+1);
 
-  for (q=0; q<qdcount; q++)
+  for (q = 0; q<qdcount; q++)
     {
-      while (1)
+      if (!(ansp = skip_name(ansp, header, plen)))
-	{
+	return NULL;
-          unsigned int label_type = (*ansp) & 0xc0;
-	  
-	  if ((unsigned int)(ansp - (unsigned char *)header) >= plen)
-	    return NULL;
-	  
-	  if (label_type == 0xc0)
-	    {
-	      /* pointer for compression. */
-	      ansp += 2;	
-	      break;
-	    }
-	  else if (label_type == 0x80)
-	    return NULL; /* reserved */
-	  else if (label_type == 0x40)
-	    {
-	      /* Extended label type */
-	      unsigned int count;
-	      
-	      if (((*ansp++) & 0x3f) != 1)
-		return NULL; /* we only understand bitstrings */
-	      
-	      count = *(ansp++); /* Bits in bitstring */
-	      
-	      if (count == 0) /* count == 0 means 256 bits */
-		ansp += 32;
-	      else
-		ansp += ((count-1)>>3)+1;
-	    }
-	  else
-	    { /* label type == 0 Bottom six bits is length */
-	      unsigned int len = (*ansp++) & 0x3f;
-	      if (len == 0)
-		break; /* zero length label marks the end. */
-	      
-	      ansp += len;
-	    }
-	}
       ansp += 4; /* class and type */
     }
   if ((unsigned int)(ansp - (unsigned char *)header) > plen) 
@@ -298,6 +306,49 @@ static unsigned char *skip_questions(HEADER *header, unsigned int plen)
   return ansp;
 }
 
+unsigned char *find_pseudoheader(HEADER *header, unsigned int plen)
+{
+  /* See if packet has an RFC2671 pseudoheader, and if so return a pointer to it. */
+  
+  int i, arcount = ntohs(header->arcount);
+  unsigned char *ansp;
+  unsigned short rdlen, type;
+
+  if (arcount == 0 || !(ansp = skip_questions(header, plen)))
+    return NULL;
+  
+  for (i = 0; i < (ntohs(header->ancount) + ntohs(header->nscount)); i++)
+    {
+      if (!(ansp = skip_name(ansp, header, plen)))
+	return NULL; 
+      ansp += 8; /* type, class, TTL */
+      GETSHORT(rdlen, ansp);
+      if ((unsigned int)(ansp + rdlen - (unsigned char *)header) > plen) 
+	return NULL;
+      ansp += rdlen;
+    }
+
+  for (i = 0; i < arcount; i++)
+    {
+      unsigned char *save;
+      if (!(ansp = skip_name(ansp, header, plen)))
+	return NULL; 
+
+      GETSHORT(type, ansp);
+      save = ansp;
+      ansp += 6; /* class, TTL */
+      GETSHORT(rdlen, ansp);
+      if ((unsigned int)(ansp + rdlen - (unsigned char *)header) > plen) 
+	return NULL;
+      if (type == ns_t_opt)
+	return save;
+      ansp += rdlen;
+    }
+  
+  return NULL;
+}
+      
+  
 /* is addr in the non-globally-routed IP space? */ 
 static int private_net(struct all_addr *addrp) 
 {
@@ -440,13 +491,16 @@ void extract_neg_addrs(HEADER *header, unsigned int qlen, char *name, time_t now
   cache_end_insert();
 }
 
-static void dns_doctor(struct doctor *doctor, struct in_addr *addr)
+static void dns_doctor(HEADER *header, struct doctor *doctor, struct in_addr *addr)
 {
   for (; doctor; doctor = doctor->next)
     if (is_same_net(doctor->in, *addr, doctor->mask))
       {
 	addr->s_addr &= ~doctor->mask.s_addr;
 	addr->s_addr |= (doctor->out.s_addr & doctor->mask.s_addr);
+	/* Since we munged the data, the server it came from is no longer authoritative */
+	header->nscount = htons(0);
+	header->arcount = htons(0);
 	break;
       }
 }
@@ -490,7 +544,7 @@ void extract_addresses(HEADER *header, unsigned int qlen, char *name,
 
       if (qtype == T_A) /* A record. */
 	{
-	  dns_doctor(doctors, (struct in_addr *)p);
+	  dns_doctor(header, doctors, (struct in_addr *)p);
 	  cache_insert(name, (struct all_addr *)p, now, 
 		       ttl, F_IPV4 | F_FORWARD);
 	}
@@ -562,7 +616,7 @@ void extract_addresses(HEADER *header, unsigned int qlen, char *name,
 
 	      if (qtype == T_A) /* A record. */
 		{
-		  dns_doctor(doctors, (struct in_addr *)p);
+		  dns_doctor(header, doctors, (struct in_addr *)p);
 		  cache_insert(name, (struct all_addr *)p, now, 
 			       cttl, F_IPV4 | F_FORWARD);
 		}
@@ -635,7 +689,7 @@ int setup_reply(HEADER *header, unsigned int qlen,
   header->tc = 0; /* not truncated */
   header->nscount = htons(0);
   header->arcount = htons(0);
-  header->ancount = htons(0); /* no answers unless changed below*/
+  header->ancount = htons(0); /* no answers unless changed below */
   if (flags == F_NEG)
     header->rcode = SERVFAIL; /* couldn't get memory */
   else if (flags == F_NOERR || flags == F_QUERY)
@@ -730,26 +784,57 @@ int check_for_bogus_wildcard(HEADER *header, unsigned int qlen, char *name,
 /* return zero if we can't answer from cache, or packet size if we can */
 int answer_request(HEADER *header, char *limit, unsigned int qlen, struct mx_record *mxnames, 
 		   char *mxtarget, unsigned int options, time_t now, 
-		   unsigned long local_ttl, char *name)
+		   unsigned long local_ttl, char *name, unsigned short edns_pcktsz)
 {
-  unsigned char *p, *ansp;
+  unsigned char *p, *ansp, *pheader;
   int qtype, qclass, is_arpa;
   struct all_addr addr;
   unsigned int nameoffset;
-  int q, qdcount = ntohs(header->qdcount); 
+  unsigned short flag;
-  int ans, anscount = 0;
+  int qdcount = ntohs(header->qdcount); 
+  int q, ans, anscount;
+  int dryrun = 0, sec_reqd = 0;
   struct crec *crecp;
-  int nxdomain = 0, auth = 1;
+  int nxdomain, auth;
 
   if (!qdcount || header->opcode != QUERY )
     return 0;
 
+  /* If there is an RFC2671 pseudoheader then it will be overwritten by
+     partial replies, so we have to do a dry run to see if we can answer
+     the query. We check to see if the do bit is set, if so we always
+     forward rather than answering from the cache, which doesn't include
+     security information. */
+
+  if ((pheader = find_pseudoheader(header, qlen)))
+    { 
+      unsigned short udpsz, ext_rcode, flags;
+      unsigned char *psave = pheader;
+
+      GETSHORT(udpsz, pheader);
+      GETSHORT(ext_rcode, pheader);
+      GETSHORT(flags, pheader);
+      
+      sec_reqd = flags & 0x8000; /* do bit */ 
+
+      /* If our client is advertising a larger UDP packet size
+	 than we allow, trim it so that we don't get an overlarge
+	 response from upstream */
+
+      if (udpsz > edns_pcktsz)
+	PUTSHORT(edns_pcktsz, psave); 
+
+      dryrun = 1;
+    }
+
+ rerun:
   /* determine end of question section (we put answers there) */
   if (!(ansp = skip_questions(header, qlen)))
     return 0; /* bad packet */
    
   /* now process each question, answers go in RRs after the question */
   p = (unsigned char *)(header+1);
+  nxdomain = 0, auth = 1, anscount = 0;
 
   for (q=0; q<qdcount; q++)
     {
@@ -769,16 +854,19 @@ int answer_request(HEADER *header, char *limit, unsigned int qlen, struct mx_rec
 
       ans = 0; /* have we answered this question */
       
-      if (qclass == C_CHAOS)
+      if (qclass == C_CHAOS && qtype == T_TXT)
 	/* special query to get version. */
 	{
-	  if (qtype == T_TXT)
+	  ans = 1;
+	  if (!dryrun)
 	    {
 	      int len;
 	      if (hostname_isequal(name, "version.bind"))
 		sprintf(name, "dnsmasq-%s", VERSION);
 	      else if (hostname_isequal(name, "authors.bind"))
 		sprintf(name, "Simon Kelley");
+	      else if (hostname_isequal(name, "copyright.bind"))
+		sprintf(name, COPYRIGHT);
 	      else
 		*name = 0;
 	      len = strlen(name);
@@ -790,235 +878,192 @@ int answer_request(HEADER *header, char *limit, unsigned int qlen, struct mx_rec
 	      *ansp++ = len;
 	      memcpy(ansp, name, len);
 	      ansp += len;
-	      ans = 1;
 	      anscount++;
-
-	      if (((unsigned char *)limit - ansp) < 0)
-		return 0;
 	    }
-	  else
+	  }
-	    return 0;
+      else if (qclass == C_IN)
-	}
-      else if (qclass != C_IN)
-	return 0; /* we can't answer non-inet queries */
-      else
 	{
-      
+	  if ((options & OPT_FILTER) && 
-	  if ((options & OPT_FILTER) && (qtype == T_SOA || qtype == T_SRV))
+	      (qtype == T_SOA || qtype == T_SRV || (qtype == T_ANY && strchr(name, '_'))))
 	    ans = 1;
-	  
+	  else 
-	  if (qtype == T_PTR || qtype == T_ANY)
 	    {
-	      crecp = NULL;
+	      if (qtype == T_PTR || qtype == T_ANY)
-	      while ((crecp = cache_find_by_addr(crecp, &addr, now, is_arpa)))
 		{
-		  unsigned long ttl;
+		  if (!(crecp = cache_find_by_addr(NULL, &addr, now, is_arpa)))
-		  /* Return 0 ttl for DHCP entries, which might change
-		     before the lease expires. */
-		  if  (crecp->flags & (F_IMMORTAL | F_DHCP))
-		    ttl = local_ttl;
-		  else
-		    ttl = crecp->ttd - now;
-		  
-		  /* don't answer wildcard queries with data not from /etc/hosts 
-		     or dhcp leases */
-		  if (qtype == T_ANY && !(crecp->flags & (F_HOSTS | F_DHCP)))
-		    return 0;
-		  
-		  ans = 1;
-		  if (crecp->flags & F_NEG)
 		    { 
-		      log_query(crecp->flags & ~F_FORWARD, name, &addr);
+		      if (is_arpa == F_IPV4 && (options & OPT_BOGUSPRIV) && private_net(&addr))
-		      auth = 0;
+			{
-		      if (crecp->flags & F_NXDOMAIN)
+			  /* if not in cache, enabled and private IPV4 address, return NXDOMAIN */
-			    nxdomain = 1;
+			  ans = 1;
+			  if (!dryrun)
+			    {
+			      log_query(F_CONFIG | F_REVERSE | F_IPV4 | F_NEG | F_NXDOMAIN, name, &addr);
+			      nxdomain = 1;
+			    }
+			}
 		    }
-		  else
+		  else do 
 		    { 
-		      if (!(crecp->flags & (F_HOSTS | F_DHCP)))
+		      /* don't answer wildcard queries with data not from /etc/hosts or dhcp leases */
-			auth = 0;
-		      ansp = add_text_record(nameoffset, ansp, ttl, 0, T_PTR, 
-					     cache_get_name(crecp));
-		      
-		      log_query(crecp->flags & ~F_FORWARD, cache_get_name(crecp), &addr);
-		      anscount++;
-		      
-		      /* if last answer exceeded packet size, give up */
-		      if (((unsigned char *)limit - ansp) < 0)
-			return 0;
-		    }
-		}
-	      
-	      /* if not in cache, enabled and private IPV4 address, fake up answer */
-	      if (ans == 0 && is_arpa == F_IPV4 && 
-		  (options & OPT_BOGUSPRIV) && 
-		  private_net(&addr))
-		{
-		  struct in_addr addr4 = *((struct in_addr *)&addr);
-		  ansp = add_text_record(nameoffset, ansp, local_ttl, 0, T_PTR, inet_ntoa(addr4));  
-		  log_query(F_CONFIG | F_REVERSE | F_IPV4, inet_ntoa(addr4), &addr);
-		  anscount++;
-		  ans = 1;
-		  
-		  if (((unsigned char *)limit - ansp) < 0)
-		    return 0;
-		}
-	    }
-	  
-	  if (qtype == T_A || qtype == T_ANY)
-	    {
-	      /* T_ANY queries for hostnames with underscores are spam
-		 from win2k - don't forward them. */
-	      if ((options & OPT_FILTER) && 
-		  qtype == T_ANY && 
-		  (strchr(name, '_') != NULL))
-		ans = 1;
-	      else
-		{ 
-		  crecp = NULL;
-		  while ((crecp = cache_find_by_name(crecp, name, now, F_IPV4)))
-		    { 
-		      unsigned long ttl;
-		      if  (crecp->flags & (F_IMMORTAL | F_DHCP))
-			ttl = local_ttl;
-		      else
-			ttl = crecp->ttd - now;
-		      
-		      /* don't answer wildcard queries with data not from /etc/hosts
-			 or DHCP leases */
 		      if (qtype == T_ANY && !(crecp->flags & (F_HOSTS | F_DHCP)))
-			return 0;
+			continue;
-		      
-		      /* If we have negative cache entry, it's OK
-			 to return no answer. */
-		      ans = 1;
 		      
 		      if (crecp->flags & F_NEG)
 			{
-			  log_query(crecp->flags, name, NULL);
+			  ans = 1;
-			  auth = 0;
+			  if (!dryrun)
-			  if (crecp->flags & F_NXDOMAIN)
+			    {
-			    nxdomain = 1;
+			      log_query(crecp->flags & ~F_FORWARD, name, &addr);
+			      auth = 0;
+			      if (crecp->flags & F_NXDOMAIN)
+				nxdomain = 1;
+			    }
 			}
-		      else
+		      else if ((crecp->flags & (F_HOSTS | F_DHCP)) || !sec_reqd)
 			{
-			  if (!(crecp->flags & (F_HOSTS | F_DHCP)))
+			  ans = 1;
-			    auth = 0;
+			  if (!dryrun)
-			  log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr);
+			    {
+			      unsigned long ttl;
+			      /* Return 0 ttl for DHCP entries, which might change
+				 before the lease expires. */
+			      if  (crecp->flags & (F_IMMORTAL | F_DHCP))
+				ttl = local_ttl;
+			      else
+				ttl = crecp->ttd - now;
 			      
-			  /* copy question as first part of answer (use compression) */
+			      if (!(crecp->flags & (F_HOSTS | F_DHCP)))
-			  PUTSHORT(nameoffset | 0xc000, ansp); 
+				auth = 0;
-			  PUTSHORT(T_A, ansp);
-			  PUTSHORT(C_IN, ansp);
-			  PUTLONG(ttl, ansp); /* TTL */
 			      
-			  PUTSHORT(INADDRSZ, ansp);
+			      ansp = add_text_record(nameoffset, ansp, ttl, 0, T_PTR, 
-			  memcpy(ansp, &crecp->addr, INADDRSZ);
+						     cache_get_name(crecp));
-			  ansp += INADDRSZ;
-			  anscount++;
 			      
-			  if (((unsigned char *)limit - ansp) < 0)
+			      log_query(crecp->flags & ~F_FORWARD, cache_get_name(crecp), &addr);
-			    return 0;
+			      anscount++;
+			      
+			      /* if last answer exceeded packet size, give up */
+			      if (((unsigned char *)limit - ansp) < 0)
+				return 0;
+			    }
 			}
-		      
+		    } while ((crecp = cache_find_by_addr(crecp, &addr, now, is_arpa)));
-		    }
 		}
-	    }
 	      
+	      for (flag = F_IPV4; flag; flag = (flag == F_IPV4) ? F_IPV6 : 0)
+		{
+		  unsigned short type = T_A;
+		  int addrsz = INADDRSZ;
+		  
+		  if (flag == F_IPV6)
+		    {
 #ifdef HAVE_IPV6
-	  if (qtype == T_AAAA || qtype == T_ANY)
+		      type = T_AAAA;
-	    {
+		      addrsz = IN6ADDRSZ;
-	      /* T_ANY queries for hostnames with underscores are spam
+#else
-		 from win2k - don't forward them. */
+		      break;
-	      if ((options & OPT_FILTER) &&
+#endif
-		  qtype == T_ANY 
+		    }
-		  && (strchr(name, '_') != NULL))
-		ans = 1;
-	      else
-		{ 
-		  crecp = NULL;
-		  while ((crecp = cache_find_by_name(crecp, name, now, F_IPV6)))
-		    { 
-		      unsigned long ttl;
-		      if  (crecp->flags & (F_IMMORTAL | F_DHCP))
-			ttl = local_ttl;
-		      else
-			ttl = crecp->ttd - now;
 		  
+		  if (qtype != type && qtype != T_ANY)
+		    continue;
+		  
+		  crecp = NULL;
+		  while ((crecp = cache_find_by_name(crecp, name, now, flag)))
+		    { 
 		      /* don't answer wildcard queries with data not from /etc/hosts
 			 or DHCP leases */
 		      if (qtype == T_ANY && !(crecp->flags & (F_HOSTS | F_DHCP)))
-			return 0;
+			continue;
-		      
-		      /* If we have negative cache entry, it's OK
-			 to return no answer. */
-		      ans = 1;
 		      
 		      if (crecp->flags & F_NEG)
 			{
-			  log_query(crecp->flags, name, NULL);
+			  ans = 1;
-			  auth = 0;
+			  if (!dryrun)
-			  if (crecp->flags & F_NXDOMAIN)
+			    {
-			    nxdomain = 1;
+			      log_query(crecp->flags, name, NULL);
+			      auth = 0;
+			      if (crecp->flags & F_NXDOMAIN)
+				nxdomain = 1;
+			    }
 			}
-		      else
+		      else if ((crecp->flags & (F_HOSTS | F_DHCP)) || !sec_reqd)
 			{
-			  if (!(crecp->flags & (F_HOSTS | F_DHCP)))
+			  ans = 1;
-			    auth = 0;
+			  if (!dryrun)
-			  log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr);
+			    {
+			      unsigned long ttl;
 			      
-			  /* copy question as first part of answer (use compression) */
+			      if  (crecp->flags & (F_IMMORTAL | F_DHCP))
-			  PUTSHORT(nameoffset | 0xc000, ansp); 
+				ttl = local_ttl;
-			  PUTSHORT(T_AAAA, ansp);
+			      else
-			  PUTSHORT(C_IN, ansp);
+				ttl = crecp->ttd - now;
-			  PUTLONG(ttl, ansp); /* TTL */
 			      
-			  PUTSHORT(IN6ADDRSZ, ansp);
+			      if (!(crecp->flags & (F_HOSTS | F_DHCP)))
-			  memcpy(ansp, &crecp->addr, IN6ADDRSZ);
+				auth = 0;
-			  ansp += IN6ADDRSZ;
+			      log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr);
-			  anscount++;
 			      
-			  if (((unsigned char *)limit - ansp) < 0)
+			      /* copy question as first part of answer (use compression) */
-			    return 0;
+			      PUTSHORT(nameoffset | 0xc000, ansp); 
+			      PUTSHORT(type, ansp);
+			      PUTSHORT(C_IN, ansp);
+			      PUTLONG(ttl, ansp); /* TTL */
+			      
+			      PUTSHORT(addrsz, ansp);
+			      memcpy(ansp, &crecp->addr, addrsz);
+			      ansp += addrsz;
+			      anscount++;
+			      
+			      if (((unsigned char *)limit - ansp) < 0)
+				return 0;
+			    }
 			}
 		    }
 		}
-	    }
-#endif
 	      
-	  if (qtype == T_MX || qtype == T_ANY)
+	      if (qtype == T_MX || qtype == T_ANY)
-	    {
-	      struct mx_record *mx;
-	      for (mx = mxnames; mx; mx = mx->next)
-		if (hostname_isequal(name, mx->mxname))
-		  break;
-	      if (mx)
 		{
-		  ansp = add_text_record(nameoffset, ansp, local_ttl, 1, T_MX, 
+		  struct mx_record *mx;
-					 mx->mxtarget ? mx->mxtarget : mxtarget);
+		  for (mx = mxnames; mx; mx = mx->next)
-		  anscount++;
+		    if (hostname_isequal(name, mx->mxname))
-		  ans = 1;
+		      break;
+		  if (mx)
+		    {
+		      ans = 1;
+		      if (!dryrun)
+			{
+			  ansp = add_text_record(nameoffset, ansp, local_ttl, 1, T_MX, 
+						 mx->mxtarget ? mx->mxtarget : mxtarget);
+			  anscount++;
+			}
+		    }
+		  else if ((options & (OPT_SELFMX | OPT_LOCALMX)) && 
+			   cache_find_by_name(NULL, name, now, F_HOSTS | F_DHCP))
+		    { 
+		      ans = 1;
+		      if (!dryrun)
+			{
+			  ansp = add_text_record(nameoffset, ansp, local_ttl, 1, T_MX,  
+						 (options & OPT_SELFMX) ? name : mxtarget);
+			  anscount++;
+			}
+		    }
 		}
-	      else if ((options & (OPT_SELFMX | OPT_LOCALMX)) && 
+	      
-		       cache_find_by_name(NULL, name, now, F_HOSTS | F_DHCP))
+	      if (qtype == T_MAILB)
-		{ 
+		ans = 1, nxdomain = 1;
-		  ansp = add_text_record(nameoffset, ansp, local_ttl, 1, T_MX,  
+	      
-					 (options & OPT_SELFMX) ? name : mxtarget);
-		  anscount++;
-		  ans = 1;
-		}
-	      if (((unsigned char *)limit - ansp) < 0)
-		return 0;
 	    }
-	  
-	  if (qtype == T_MAILB)
-	    ans = 1, nxdomain = 1;
-	      
 	}
       
-      if (!ans)
+      if (!ans || ((unsigned char *)limit - ansp) < 0)
 	return 0; /* failed to answer a question */
+    }
 
+  if (dryrun)
+    {
+      dryrun = 0;
+      goto rerun;
     }
   
   /* done all questions, set up header and return length of result */

src/rfc2131.c

@@ -105,9 +105,7 @@ int dhcp_reply(struct dhcp_context *context,
   struct in_addr addr;
   unsigned short fuzz = 0;
 
-  if (mess->op != BOOTREQUEST || 
+  if (mess->op != BOOTREQUEST || mess->cookie != htonl(DHCP_COOKIE))
-      mess->hlen != ETHER_ADDR_LEN ||
-      mess->cookie != htonl(DHCP_COOKIE))
     return 0;
   
   /* Token ring is supported when we have packet sockets
@@ -117,12 +115,17 @@ int dhcp_reply(struct dhcp_context *context,
 
 #ifdef HAVE_BPF
   if (mess->htype != ARPHRD_ETHER)	
-    return 0;	
 #else
-  if (mess->htype != ARPHRD_ETHER && 
+  if (mess->htype != ARPHRD_ETHER && mess->htype != ARPHRD_IEEE802)
-      mess->htype != ARPHRD_IEEE802)
-    return 0;	
 #endif
+    {
+      syslog(LOG_WARNING, "DHCP request for unsupported hardware type (%d) recieved on %s", 
+	     mess->htype, iface_name);
+      return 0;
+    }	
+    
+  if (mess->hlen != ETHER_ADDR_LEN)
+    return 0;
 
   mess->op = BOOTREPLY;
 
@@ -317,6 +320,9 @@ int dhcp_reply(struct dhcp_context *context,
 	  syslog(LOG_WARNING, "disabling DHCP static address %s", inet_ntoa(config->addr));
 	  config->flags &= ~CONFIG_ADDR ;
 	}
+      else
+	/* make sure this host gets a different address next time. */
+	context->addr_epoch++;
       
       return 0;
 
@@ -335,18 +341,16 @@ int dhcp_reply(struct dhcp_context *context,
     case DHCPDISCOVER:
       if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))	 
 	addr = option_addr(opt);
-      
       if (have_config(config, CONFIG_DISABLE))
 	message = "ignored";
       else if (have_config(config, CONFIG_ADDR) && !lease_find_by_addr(config->addr))
 	mess->yiaddr = config->addr;
-      else if (lease && is_same_net(lease->addr, context->start, context->netmask))
+      else if (lease && address_available(context, lease->addr))
 	mess->yiaddr = lease->addr;
-      else if (opt && address_available(context, addr))
+      else if (opt && address_available(context, addr) && !lease_find_by_addr(addr))
 	mess->yiaddr = addr;
       else if (!address_allocate(context, dhcp_configs, &mess->yiaddr, mess->chaddr))
 	message = "no address available";      
-      
       log_packet("DISCOVER", opt ? &addr : NULL, mess->chaddr, iface_name, message);          
       
       if (message)
@@ -394,11 +398,9 @@ int dhcp_reply(struct dhcp_context *context,
 	      lease = NULL;
 	    }
 	    
-	  /* accept addresses in the dynamic range or ones allocated statically to
-	     particular hosts or an address which the host already has. */
 	  if (!lease)
 	    { 
-	      if (!address_available(context, mess->yiaddr) && 
+	      if ((!address_available(context, mess->yiaddr) || lease_find_by_addr(mess->yiaddr)) && 
 		  (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr))
 		message = "address unavailable";
 	      else if (!(lease = lease_allocate(clid, clid_len, mess->yiaddr)))
@@ -426,6 +428,19 @@ int dhcp_reply(struct dhcp_context *context,
       if (!message && !is_same_net(mess->yiaddr, context->start, context->netmask))
 	message = "wrong network";
 
+      /* Check for renewal of a lease which is now outside the allowed range. */
+      if (!message && !address_available(context, mess->yiaddr) &&
+	  (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr))
+	message = "address no longer available";
+
+      /* Check if a new static address has been configured. Be very sure that
+	 when the client does DISCOVER, it will get the static address, otherwise
+	 an endless protocol loop will ensue. */
+      if (!message && have_config(config, CONFIG_ADDR) &&
+	  !have_config(config, CONFIG_DISABLE) &&
+	  !lease_find_by_addr(config->addr))
+	message = "static lease available";
+   
       log_packet("REQUEST", &mess->yiaddr, mess->chaddr, iface_name, NULL);
       
       if (message)