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Dnsmasq
Commit feba5c1d authored by Simon Kelley's avatar Simon Kelley
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import of dnsmasq-2.10.tar.gz

parent de37951c
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CHANGELOG
View file @ feba5c1d
......@@ -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
View file @ feba5c1d
......@@ -20,12 +20,10 @@ A: The high ports that dnsmasq opens is for replies from the upstream
Q: Why doesn't dnsmasq support DNS queries over TCP? Don't the RFC's specify
that?
A: Yes, they do, so technically dnsmasq is not RFC-compliant. In practice, the
sorts of queries which dnsmasq is used for are always sent via UDP. Adding
TCP support would make dnsmasq much more heavyweight for no practical
benefit. If you really want to do zone transfers, forward port 53 TCP
using in-kernel port-forwarding or a port-fowarder like rinetd.
A: Update: from version 2.10, it does. There are a few limitations:
data obtained via TCP is not cached, and dynamically-created
interfaces may break under certain circumstances. Source-address
or query-port specifications are ignored for TCP.
Q: When I send SIGUSR1 to dump the contents of the cache, some entries have
no IP address and are for names like mymachine.mydomain.com.mydomain.com.
......@@ -74,6 +72,8 @@ A: Use the standard DNS convention of <reversed address>.in-addr.arpa.
For instance to send reverse queries on the range 192.168.0.0 to
192.168.0.255 to a nameserver at 10.0.0.1 do
server=/0.168.192.in-addr.arpa/10.0.0.1
Note that the "bogus-priv" option take priority over this option,
so the above will not work when the bogus-priv option is set.
Q: Dnsmasq fails to start with an error like this: "dnsmasq: bind
failed: Cannot assign requested address". What's the problem?
......
Makefile
View file @ feba5c1d
......@@ -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 → 100644
View file @ feba5c1d
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 → 100755
View file @ feba5c1d
#!/usr/bin/perl
# dnslist - Read state file from dnsmasq and create a nice web page to display
# a list of DHCP clients.
#
# Copyright (C) 2004 Thomas Tuttle
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTIBILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program*; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# * The license is in fact included at the end of this file, and can
# either be viewed by reading everything after "__DATA__" or by
# running dnslist with the '-l' option.
#
# Version: 0.2
# Author: Thomas Tuttle
# Email: dnslist.20.thinkinginbinary@spamgourmet.org
# License: GNU General Public License, version 2.0
#
# v. 0.0: Too ugly to publish, thrown out.
#
# v. 0.1: First rewrite.
# Added master host list so offline hosts can still be displayed.
# Fixed modification detection (a newer modification time is lower.)
#
# v. 0.2: Fixed Client ID = "*" => "None"
# Fixed HTML entities (a client ID of ????<? screwed it up)
# Fixed command-line argument processing (apparently, "shift @ARGV" !=
# "$_ = shift @ARGV"...)
# Added license information.
use Template;
# Location of state file. (This is the dnsmasq default.)
# Change with -s <file>
my $dnsmasq_state_file = '/var/lib/misc/dnsmasq.leases';
# Location of template. (Assumed to be in current directory.)
# Change with -t <file>
my $html_template_file = 'dnslist.tt2';
# File to write HTML page to. (This is where Slackware puts WWW pages. It may
# be different on other systems. Make sure the permissions are set correctly
# for it.)
my $html_output_file = '/var/www/htdocs/dhcp.html';
# Time to wait after each page update. (The state file is checked for changes
# before each update but is not read in each time, in case it is very big. The
# page is rewritten just so the "(updated __/__ __:__:__)" text changes ;-)
my $wait_time = 2;
# Read command-line arguments.
while ($_ = shift @ARGV) {
if (/-s/) { $dnsmasq_state_file = shift; next; }
if (/-t/) { $html_template_file = shift; next; }
if (/-o/) { $html_output_file = shift; next; }
if (/-d/) { $wait_time = shift; next; }
if (/-l/) { show_license(); exit; }
die "usage: dnslist [-s state_file] [-t template_file] [-o output_file] [-d delay_time]\n";
}
# Master list of clients, offline and online.
my $list = {};
# Sorted host list. (It's actually sorted by IP--the sub &byip() compares two
# IP addresses, octet by octet, and figures out which is higher.)
my @hosts = ();
# Last time the state file was changed.
my $last_state_change;
# Check for a change to the state file.
sub check_state {
if (defined $last_state_change) {
if (-M $dnsmasq_state_file < $last_state_change) {
print "check_state: state file has been changed.\n";
$last_state_change = -M $dnsmasq_state_file;
return 1;
} else {
return 0;
}
} else {
# Last change undefined, so we are running for the first time.
print "check_state: reading state file at startup.\n";
read_state();
$last_state_change = -M $dnsmasq_state_file;
return 1;
}
}
# Read data in state file.
sub read_state {
my $old;
my $new;
# Open file.
unless (open STATE, $dnsmasq_state_file) {
warn "read_state: can't open $dnsmasq_state_file!\n";
return 0;
}
# Mark all hosts as offline, saving old state.
foreach $ether (keys %{$list}) {
$list->{$ether}->{'old_online'} = $list->{$ether}->{'online'};
$list->{$ether}->{'online'} = 0;
}
# Read hosts.
while (<STATE>) {
chomp;
@host{qw/raw_lease ether_addr ip_addr hostname raw_client_id/} = split /\s+/;
$ether = $host{ether_addr};
# Mark each online host as online.
$list->{$ether}->{'online'} = 1;
# Copy data to master list.
foreach $key (keys %host) {
$list->{$ether}->{$key} = $host{$key};
}
}
close STATE;
# Handle changes in offline/online state. (The sub &do_host() handles
# all of the extra stuff to do with a host's data once it is read.
foreach $ether (keys %{$list}) {
$old = $list->{$ether}->{'old_online'};
$new = $list->{$ether}->{'online'};
if (not $old) {
if (not $new) {
do_host($ether, 'offline');
} else {
do_host($ether, 'join');
}
} else {
if (not $new) {
do_host($ether, 'leave');
} else {
do_host($ether, 'online');
}
}
}
# Sort hosts by IP ;-)
@hosts = sort byip values %{$list};
# Copy sorted list to template data store.
$data->{'hosts'} = [ @hosts ];
}
# Do stuff per host.
sub do_host {
my ($ether, $status) = @_;
# Find textual representation of DHCP client ID.
if ($list->{$ether}->{'raw_client_id'} eq '*') {
$list->{$ether}->{'text_client_id'} = 'None';
} else {
my $text = "";
foreach $char (split /:/, $list->{$ether}->{'raw_client_id'}) {
$char = pack('H2', $char);
if (ord($char) >= 32 and ord($char) <= 127) {
$text .= $char;
} else {
$text .= "?";
}
}
$list->{$ether}->{'text_client_id'} = $text;
}
# Convert lease expiration date/time to text.
if ($list->{$ether}->{'raw_lease'} == 0) {
$list->{$ether}->{'text_lease'} = 'Never';
} else {
$list->{$ether}->{'text_lease'} = nice_time($list->{$ether}->{'raw_lease'});
}
if ($status eq 'offline') {
# Nothing to do.
} elsif ($status eq 'online') {
# Nothing to do.
} elsif ($status eq 'join') {
# Update times for joining host.
print "do_host: $ether joined the network.\n";
$list->{$ether}->{'join_time'} = time;
$list->{$ether}->{'since'} = nice_time(time);
} elsif ($status eq 'leave') {
# Update times for leaving host.
print "do_host: $ether left the network.\n";
$list->{$ether}->{'leave_time'} = time;
$list->{$ether}->{'since'} = nice_time(time);
}
}
# Convert time to a string representation.
sub nice_time {
my $time = shift;
my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $dst) = localtime($time);
$sec = pad($sec, '0', 2);
$min = pad($min, '0', 2);
$hour = pad($hour, '0', 2);
$mon = pad($mon, '0', 2);
$mday = pad($mday, '0', 2);
return "$mon/$mday $hour:$min:$sec";
}
# Pad string to a certain length by repeatedly prepending another string.
sub pad {
my ($text, $pad, $length) = @_;
while (length($text) < $length) {
$text = "$pad$text";
}
return $text;
}
# Compare two IP addresses. (Uses $a and $b from sort.)
sub byip {
# Split into octets.
my @a = split /\./, $a->{ip_addr};
my @b = split /\./, $b->{ip_addr};
# Compare octets.
foreach $n (0..3) {
return $a[$n] <=> $b[$n] if ($a[$n] != $b[$n]);
}
# If we get here there is no difference.
return 0;
}
# Output HTML file.
sub write_output {
# Create new template object.
my $template = Template->new(
{
ABSOLUTE => 1, # /var/www/... is an absolute path
OUTPUT => $html_output_file # put it here, not STDOUT
}
);
$data->{'updated'} = nice_time(time); # add "(updated ...)" to file
unless ($template->process($html_template_file, $data)) { # do it
warn "write_output: Template Toolkit error: " . $template->error() . "\n";
return 0;
}
print "write_output: page updated.\n";
return 1;
}
sub show_license {
while (<DATA>) {
print;
$line++;
if ($line == 24) { <>; $line = 1; }
}
}
# Main loop.
while (1) {
# Check for state change.
if (check_state()) {
read_state();
sleep 1; # Sleep for a second just so we don't wear anything
# out. (By not sleeping the whole time after a change
# we can detect rapid changes more easily--like if 300
# hosts all come back online, they show up quicker.)
} else {
sleep $wait_time; # Take a nap.
}
write_output(); # Write the file anyway.
}
__DATA__
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
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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 → 100644
View file @ feba5c1d
<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
View file @ feba5c1d
......@@ -5,7 +5,7 @@
###############################################################################
Name: dnsmasq
Version: 2.9
Version: 2.10
Release: 1
Copyright: GPL
Group: System Environment/Daemons
......
dnsmasq-suse.spec
View file @ feba5c1d
......@@ -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
View file @ feba5c1d
......@@ -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
.B \-i
flags are given, dnsmasq listens on all available interfaces unless overridden by
.B \-a
Listen only on the specified interface(s). Dnsmasq automatically adds
the loopback (local) interface to the list of interfaces to use when
the
.B \--interface
option is used. If no
.B \--interface
or
.B \-I
flags. If IP alias interfaces (eg "eth1:0") are used with
.B \--listen-address
options are given dnsmasq listens on all available interfaces except any
given in
.B \--except-interface
options. If IP alias interfaces (eg "eth1:0") are used with
.B --interface
or
.B --except-interface
......@@ -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
.B \-i
more than one address may be specified. Unlike
.B \-i
the loopback interface is not special: if dnsmasq is to listen on the loopback interface,
it's IP, 127.0.0.1, must be explicitly given. If no
.B \-a
flags are given, dnsmasq listens on all available interfaces unless overridden by
.B \-i
or
.B \-I
flags.
Listen on the given IP address(es). Both
.B \--interface
and
.B \--listen-address
options may be given, in which case the set of both interfaces and
addresses is used. Note that if no
.B \--interface
option is given, but
.B \--listen-address
is, dnsmasq will not automatically listen on the loopback
interface. To achieve this, its IP address, 127.0.0.1, must be
explicitly given as a
.B \--listen-address
option.
.TP
.B \-z, --bind-interfaces
On systems which support it, dnsmasq binds the wildcard address,
......@@ -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
View file @ feba5c1d
......@@ -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 → 100644
View file @ feba5c1d
--- 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
View file @ feba5c1d
......@@ -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
View file @ feba5c1d
......@@ -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
View file @ feba5c1d
......@@ -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)
......@@ -184,6 +209,31 @@ int main (int argc, char **argv)
dhcp_init(&dhcpfd, &dhcp_raw_fd);
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);
......@@ -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" :
......@@ -282,9 +350,9 @@ int main (int argc, char **argv)
if (dhcp)
syslog(LOG_INFO, "DHCP, %s will be written every %ds", lease_file, min_leasetime/3);
#endif
if (getuid() == 0 || geteuid() == 0)
syslog(LOG_WARNING, "failed to drop root privs");
if (!(options & OPT_DEBUG) && (getuid() == 0 || geteuid() == 0))
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,
mxnames, mxtarget, options, now, local_ttl, dnamebuff,
if_names, if_addrs, if_except, last_server, servers);
{
if (FD_ISSET(listener->fd, &rset))
last_server = receive_query(listener, packet,
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
View file @ feba5c1d
......@@ -11,7 +11,8 @@
*/
/* 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
View file @ feba5c1d
......@@ -26,7 +26,7 @@ static unsigned short get_id(void);
void forward_init(int first)
{
struct frec *f;
if (first)
frec_list = NULL;
for (f = frec_list; f; f = f->next)
......@@ -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)
......@@ -52,64 +51,143 @@ static void send_from(int fd, int nowild, char *packet, int len,
char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
#endif
} control_u;
iov[0].iov_base = packet;
iov[0].iov_len = len;
if (nowild)
{
msg.msg_control = NULL;
msg.msg_controllen = 0;
}
else
{
msg.msg_control = &control_u;
msg.msg_controllen = sizeof(control_u);
}
msg.msg_control = NULL;
msg.msg_controllen = 0;
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 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;
pkt->ipi_spec_dst = source->addr.addr4;
msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
cmptr->cmsg_level = SOL_IP;
cmptr->cmsg_type = IP_PKTINFO;
}
msg.msg_control = &control_u;
msg.msg_controllen = sizeof(control_u);
{
struct cmsghdr *cmptr = CMSG_FIRSTHDR(&msg);
#if defined(IP_PKTINFO)
struct in_pktinfo *pkt = (struct in_pktinfo *)CMSG_DATA(cmptr);
pkt->ipi_ifindex = 0;
pkt->ipi_spec_dst = source->addr.addr4;
msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_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;
msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
cmptr->cmsg_level = IPPROTO_IP;
cmptr->cmsg_type = IP_SENDSRCADDR;
}
struct in_addr *a = (struct in_addr *)CMSG_DATA(cmptr);
*a = source->addr.addr4;
msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
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);
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;
msg.msg_control = &control_u;
msg.msg_controllen = sizeof(control_u);
{
struct cmsghdr *cmptr = CMSG_FIRSTHDR(&msg);
struct in6_pktinfo *pkt = (struct in6_pktinfo *)CMSG_DATA(cmptr);
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)
{
/* 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);
unsigned int matchlen = 0;
struct server *serv;
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
}
}
}
}
flags = search_servers(servers, options, &addrp, gotname, dnamebuff, &type, &domain);
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 (!flags && !(forward = get_new_frec(now)))
/* table full - server failure. */
flags = F_NEG;
if (forward)
{
......@@ -229,7 +243,7 @@ static struct server *forward_query(int udpfd, union mysockaddr *udpaddr,
start = servers;
forwardall = 1;
}
forward->source = *udpaddr;
forward->dest = *dst_addr;
forward->new_id = get_id();
......@@ -238,7 +252,7 @@ static struct server *forward_query(int udpfd, union mysockaddr *udpaddr,
header->id = htons(forward->new_id);
}
}
/* check for send errors here (no route to host)
if we fail to send to all nameservers, send back an error
packet straight away (helps modem users when offline) */
......@@ -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)
flags = F_NOERR; /* NULL servers are OK. */
else if (!(start->flags & SERV_LITERAL_ADDRESS) &&
sendto(start->sfd->fd, (char *)header, plen, 0,
&start->addr.sa,
sa_len(&start->addr)) != -1)
if (!(start->flags & SERV_LITERAL_ADDRESS) &&
sendto(start->sfd->fd, (char *)header, plen, 0,
&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;
......@@ -339,41 +400,11 @@ struct server *reply_query(struct serverfd *sfd, int options, char *packet, time
if (!last_server)
last_server = forward->sentto;
}
/* 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 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);
}
}
if (!process_reply(header, now, dnamebuff, bogus_nxdomain, doctors, &serveraddr, n, options, edns_pcktsz))
return NULL;
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;
......@@ -603,8 +826,8 @@ 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 &&
f->orig_id == id &&
......
src/lease.c
View file @ feba5c1d
......@@ -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 &&
memcmp(clid, lease->hwaddr, ETHER_ADDR_LEN) == 0)
if (memcmp(clid, lease->hwaddr, ETHER_ADDR_LEN) == 0)
return lease;
}
......
src/network.c
View file @ feba5c1d
......@@ -25,8 +25,12 @@ 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)
{
......@@ -34,8 +38,11 @@ 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))
found = tmp->used = 1;
......@@ -220,6 +227,65 @@ struct irec *enumerate_interfaces(struct iname **names,
return iface;
}
#ifdef HAVE_IPV6
static int create_ipv6_listener(struct listener **link, int port)
{
union mysockaddr addr;
int tcpfd, fd, flags, save;
struct listener *l;
int opt = 1;
addr.in6.sin6_family = AF_INET6;
addr.in6.sin6_addr = in6addr_any;
addr.in6.sin6_port = htons(port);
addr.in6.sin6_flowinfo = htonl(0);
#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)
{
save = errno;
close(fd);
errno = save;
return 0;
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
setsockopt(fd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
setsockopt(tcpfd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
(flags = fcntl(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)
{
save = errno;
close(fd);
close(tcpfd);
errno = save;
return 0;
}
l = safe_malloc(sizeof(struct listener));
l->fd = fd;
l->tcpfd = tcpfd;
l->family = AF_INET6;
l->next = NULL;
*link = l;
return 1;
}
#endif
struct listener *create_wildcard_listeners(int port)
{
#if !(defined(IP_PKTINFO) || (defined(IP_RECVDSTADDR) && defined(IP_RECVIF) && defined(IP_SENDSRCADDR)))
......@@ -227,10 +293,9 @@ struct listener *create_wildcard_listeners(int port)
#else
union mysockaddr addr;
int opt = 1;
struct listener *listen;
#ifdef HAVE_IPV6
int fd;
#endif
struct listener *l, *l6 = NULL;
int flags;
int tcpfd, fd;
addr.in.sin_family = AF_INET;
addr.in.sin_addr.s_addr = INADDR_ANY;
......@@ -238,94 +303,87 @@ struct listener *create_wildcard_listeners(int 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)
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return NULL;
if ((tcpfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
free(listen);
close (fd);
return NULL;
}
if (setsockopt(listen->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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(listen->fd, SOL_IP, IP_PKTINFO, &opt, sizeof(opt)) == -1 ||
setsockopt(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 ||
setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt)) == -1 ||
setsockopt(fd, IPPROTO_IP, IP_RECVIF, &opt, sizeof(opt)) == -1 ||
#endif
bind(listen->fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
bind(fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
{
close(listen->fd);
free(listen);
close(fd);
close(tcpfd);
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);
addr.in6.sin6_flowinfo = htonl(0);
#ifdef HAVE_SOCKADDR_SA_LEN
addr.in6.sin6_len = sizeof(struct sockaddr_in6);
#endif
if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) == -1)
{
if (errno != EPROTONOSUPPORT &&
errno != EAFNOSUPPORT &&
errno != EINVAL)
{
close(listen->fd);
free(listen);
return NULL;
}
}
else
{
listen->next = safe_malloc(sizeof(struct listener));
listen->next->fd = fd;
listen->next->family = AF_INET6;
listen->next->next = NULL;
if (setsockopt(listen->next->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
setsockopt(listen->next->fd, IPV6_LEVEL, IPV6_PKTINFO, &opt, sizeof(opt)) == -1 ||
bind(listen->next->fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
{
close(listen->next->fd);
free(listen->next);
close(listen->fd);
free(listen);
return NULL;
}
}
#endif
return listen;
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 */
for (iface = interfaces ;iface; iface = iface->next)
{
struct listener *new = safe_malloc(sizeof(struct listener));
new->family = iface->addr.sa.sa_family;
new->next = listeners;
listeners = new;
if ((new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1)
die("failed to create socket: %s", NULL);
if (setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
bind(new->fd, &iface->addr.sa, sa_len(&iface->addr)) == -1)
die("failed to bind socket: %s", NULL);
}
#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;
new->next = listeners;
listeners = new;
if ((new->tcpfd = socket(iface->addr.sa.sa_family, SOCK_STREAM, 0)) == -1 ||
(new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1 ||
setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
setsockopt(new->tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
/* See Stevens 16.6 */
(flags = fcntl(new->tcpfd, F_GETFL, 0)) == -1 ||
fcntl(new->tcpfd, F_SETFL, flags | O_NONBLOCK) == -1 ||
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
View file @ feba5c1d
......@@ -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 = '?';
......@@ -685,7 +699,8 @@ unsigned int read_opts (int argc, char **argv, char *buff, struct resolvc **reso
struct dhcp_context *new = safe_malloc(sizeof(struct dhcp_context));
new->next = *dhcp;
new->lease_time = DEFLEASE;
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
View file @ feba5c1d
......@@ -244,52 +244,60 @@ static int in_arpa_name_2_addr(char *namein, struct all_addr *addrp)
return 0;
}
static unsigned char *skip_questions(HEADER *header, unsigned int plen)
static unsigned char *skip_name(unsigned char *ansp, HEADER *header, unsigned int plen)
{
int q, qdcount = ntohs(header->qdcount);
unsigned char *ansp = (unsigned char *)(header+1);
for (q=0; q<qdcount; q++)
while(1)
{
while (1)
unsigned int label_type = (*ansp) & 0xc0;
if ((unsigned int)(ansp - (unsigned char *)header) >= plen)
return NULL;
if (label_type == 0xc0)
{
unsigned int label_type = (*ansp) & 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 ((unsigned int)(ansp - (unsigned char *)header) >= plen)
return NULL;
if (((*ansp++) & 0x3f) != 1)
return NULL; /* we only understand bitstrings */
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;
}
count = *(ansp++); /* Bits in bitstring */
if (count == 0) /* count == 0 means 256 bits */
ansp += 32;
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 += ((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++)
{
if (!(ansp = skip_name(ansp, header, plen)))
return NULL;
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)
......@@ -730,27 +784,58 @@ 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);
int ans, anscount = 0;
unsigned short flag;
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++)
{
/* save pointer to name for copying into answers */
......@@ -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)
return 0; /* we can't answer non-inet queries */
else
}
else if (qclass == C_IN)
{
if ((options & OPT_FILTER) && (qtype == T_SOA || qtype == T_SRV))
if ((options & OPT_FILTER) &&
(qtype == T_SOA || qtype == T_SRV || (qtype == T_ANY && strchr(name, '_'))))
ans = 1;
if (qtype == T_PTR || qtype == T_ANY)
else
{
crecp = NULL;
while ((crecp = cache_find_by_addr(crecp, &addr, now, is_arpa)))
{
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;
/* 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);
auth = 0;
if (crecp->flags & F_NXDOMAIN)
nxdomain = 1;
if (qtype == T_PTR || qtype == T_ANY)
{
if (!(crecp = cache_find_by_addr(NULL, &addr, now, is_arpa)))
{
if (is_arpa == F_IPV4 && (options & OPT_BOGUSPRIV) && private_net(&addr))
{
/* if not in cache, enabled and private IPV4 address, return NXDOMAIN */
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)))
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++;
/* don't answer wildcard queries with data not from /etc/hosts or dhcp leases */
if (qtype == T_ANY && !(crecp->flags & (F_HOSTS | F_DHCP)))
continue;
/* if last answer exceeded packet size, give up */
if (((unsigned char *)limit - ansp) < 0)
return 0;
}
if (crecp->flags & F_NEG)
{
ans = 1;
if (!dryrun)
{
log_query(crecp->flags & ~F_FORWARD, name, &addr);
auth = 0;
if (crecp->flags & F_NXDOMAIN)
nxdomain = 1;
}
}
else if ((crecp->flags & (F_HOSTS | F_DHCP)) || !sec_reqd)
{
ans = 1;
if (!dryrun)
{
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;
if (!(crecp->flags & (F_HOSTS | F_DHCP)))
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;
}
}
} while ((crecp = cache_find_by_addr(crecp, &addr, now, is_arpa)));
}
/* 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))
for (flag = F_IPV4; flag; flag = (flag == F_IPV4) ? F_IPV6 : 0)
{
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;
unsigned short type = T_A;
int addrsz = INADDRSZ;
if (flag == F_IPV6)
{
#ifdef HAVE_IPV6
type = T_AAAA;
addrsz = IN6ADDRSZ;
#else
break;
#endif
}
if (qtype != type && qtype != T_ANY)
continue;
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)))
while ((crecp = cache_find_by_name(crecp, name, now, flag)))
{
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;
/* If we have negative cache entry, it's OK
to return no answer. */
ans = 1;
continue;
if (crecp->flags & F_NEG)
{
log_query(crecp->flags, name, NULL);
auth = 0;
if (crecp->flags & F_NXDOMAIN)
nxdomain = 1;
ans = 1;
if (!dryrun)
{
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)))
auth = 0;
log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr);
/* copy question as first part of answer (use compression) */
PUTSHORT(nameoffset | 0xc000, ansp);
PUTSHORT(T_A, ansp);
PUTSHORT(C_IN, ansp);
PUTLONG(ttl, ansp); /* TTL */
PUTSHORT(INADDRSZ, ansp);
memcpy(ansp, &crecp->addr, INADDRSZ);
ansp += INADDRSZ;
anscount++;
if (((unsigned char *)limit - ansp) < 0)
return 0;
ans = 1;
if (!dryrun)
{
unsigned long ttl;
if (crecp->flags & (F_IMMORTAL | F_DHCP))
ttl = local_ttl;
else
ttl = crecp->ttd - now;
if (!(crecp->flags & (F_HOSTS | F_DHCP)))
auth = 0;
log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr);
/* copy question as first part of answer (use compression) */
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;
}
}
}
}
}
#ifdef HAVE_IPV6
if (qtype == T_AAAA || 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_IPV6)))
{
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;
/* If we have negative cache entry, it's OK
to return no answer. */
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)
{
ans = 1;
if (crecp->flags & F_NEG)
if (!dryrun)
{
log_query(crecp->flags, name, NULL);
auth = 0;
if (crecp->flags & F_NXDOMAIN)
nxdomain = 1;
ansp = add_text_record(nameoffset, ansp, local_ttl, 1, T_MX,
mx->mxtarget ? mx->mxtarget : mxtarget);
anscount++;
}
else
}
else if ((options & (OPT_SELFMX | OPT_LOCALMX)) &&
cache_find_by_name(NULL, name, now, F_HOSTS | F_DHCP))
{
ans = 1;
if (!dryrun)
{
if (!(crecp->flags & (F_HOSTS | F_DHCP)))
auth = 0;
log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr);
/* copy question as first part of answer (use compression) */
PUTSHORT(nameoffset | 0xc000, ansp);
PUTSHORT(T_AAAA, ansp);
PUTSHORT(C_IN, ansp);
PUTLONG(ttl, ansp); /* TTL */
PUTSHORT(IN6ADDRSZ, ansp);
memcpy(ansp, &crecp->addr, IN6ADDRSZ);
ansp += IN6ADDRSZ;
ansp = add_text_record(nameoffset, ansp, local_ttl, 1, T_MX,
(options & OPT_SELFMX) ? name : mxtarget);
anscount++;
if (((unsigned char *)limit - ansp) < 0)
return 0;
}
}
}
}
#endif
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,
mx->mxtarget ? mx->mxtarget : mxtarget);
anscount++;
ans = 1;
}
else if ((options & (OPT_SELFMX | OPT_LOCALMX)) &&
cache_find_by_name(NULL, name, now, F_HOSTS | F_DHCP))
{
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 (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
View file @ feba5c1d
......@@ -105,9 +105,7 @@ int dhcp_reply(struct dhcp_context *context,
struct in_addr addr;
unsigned short fuzz = 0;
if (mess->op != BOOTREQUEST ||
mess->hlen != ETHER_ADDR_LEN ||
mess->cookie != htonl(DHCP_COOKIE))
if (mess->op != BOOTREQUEST || mess->cookie != htonl(DHCP_COOKIE))
return 0;
/* Token ring is supported when we have packet sockets
......@@ -116,14 +114,19 @@ int dhcp_reply(struct dhcp_context *context,
token ring hwaddrs are the same size as ethernet hwaddrs. */
#ifdef HAVE_BPF
if (mess->htype != ARPHRD_ETHER)
return 0;
if (mess->htype != ARPHRD_ETHER)
#else
if (mess->htype != ARPHRD_ETHER &&
mess->htype != ARPHRD_IEEE802)
return 0;
if (mess->htype != ARPHRD_ETHER && mess->htype != ARPHRD_IEEE802)
#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;
if ((opt = option_find(mess, sz, OPTION_MAXMESSAGE)))
......@@ -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";
message = "no address available";
log_packet("DISCOVER", opt ? &addr : NULL, mess->chaddr, iface_name, message);
if (message)
......@@ -393,12 +397,10 @@ int dhcp_reply(struct dhcp_context *context,
lease_prune(lease, now);
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)))
......@@ -425,7 +427,20 @@ int dhcp_reply(struct dhcp_context *context,
/* If a machine moves networks whilst it has a lease, we catch that here. */
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)
......
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