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#!/usr/bin/perl
# usage: (cat RRs; echo .) | userv dyndns <zone> <subdomain>
# Not all zone file formats are accepted:
# - All RRs must have owners specified.
# - All RRs must have TTLs specified.
# - The owner must be specified as a sub-subdomain, relative
# to <subdomain>.<zone>, and so must not have a trailing `.';
# where the owner is to be <subdomain>.<zone>, `@' must be used.
# Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
# Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
# Copyright 1999,2003
# Chancellor Masters and Scholars of the University of Cambridge
# Copyright 2010 Tony Finch <fanf@dotat.at>
#
# This 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 3 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 userv-utils; if not, see http://www.gnu.org/licenses/.
use POSIX;
BEGIN {
$vardir= "/var/lib/userv/dyndns";
$defconf= "/etc/userv/dyndns-domains";
$libdir= "/usr/share/userv/dyndns";
}
END {
remove "$vardir/tmp/$$" or $! == ENOENT or
warn "cannot remove tempfile:$!\n";
}
use FileHandle;
use IO::File;
use Socket;
use Socket6;
@ARGV==2 or die "need <zone> and <domain> arguments\n";
($zone,$subdomain) = @ARGV;
domainsyntax("command line",$zone);
domainsyntax("command line",$subdomain) unless $subdomain eq '@';
@userv_groups= split m/ /, $ENV{'USERV_GROUP'};
@rates= (1,1,1000);
$ttlmin= 0;
$ttlmax= 86400;
sub readconf ($) {
my ($cf,$fh) = @_;
$fh= new FileHandle;
$fh->open("< $cf") or die "$cf: $!\n";
for (;;) {
$!=0; $_= <$fh>;
length or die "$cf:".($? ? "read:$?" : "eof")."\n";
s/^\s+//; chomp; s/\s+$//;
last if m/^eof$/;
next if m/^\#/ or !m/\S/;
if (m/^zone\s+(\S+)$/) {
$thiszone= $1 eq $zone;
} elsif (m/^ratelimit\s+(\d+)\s+(\d+)\s+(\d+)$/) {
@rates= ($1,$2,$3);
} elsif (m/^ttlrange\s+(\d+)\s+(\d+)$/) {
($ttlmin,$ttlmax) = ($1,$2);
} elsif (m/^rrs\s+([A-Za-z0-9 \t]+)$/) {
$rrt_list= $1;
undef %rrt_allowed;
grep { y/a-z/A-Z/; $rrt_allowed{$_}= 1; } split m/\s+/, $1;
} elsif (m/^include\s+(\S.*)$/) {
return if readconf($1);
} elsif (m/^subdomain\s+(\S+)\s+(\S+)$/) {
next unless $thiszone;
next unless $1 eq $subdomain;
next unless grep { $_ eq $2 } @userv_groups;
return 1;
} else {
die "$cf:$.: config error\n";
}
}
close $fh or die "$cf: close: $!\n";
return 0;
}
readconf "$defconf"
or die "permission denied\n";
chdir "$vardir" or die "chdir dyndns:$!\n";
open T,">tmp/$$" or die "create temp file: $!\n";
for (;;) {
$?=0; $_= <STDIN>;
die "input:$.:".($? ? "$?" : "eof") unless length;
chomp;
last if m/^\.$/;
s/^(\S+)\s+(\d+)\s+([A-Za-z][0-9A-Za-z]*)\s+//
or die "input:$.:bogus line\n";
($owner,$ttl,$type)= ($1,$2,$3);
if ($owner eq '@') {
$write_owner= $subdomain;
} else {
domainsyntax("input:$.",$owner) unless $owner eq '@';
$write_owner= $subdomain eq '@' ? $owner : "$owner.$subdomain";
}
length "$write_owner.$zone." < 255
or die "input:$.:$owner:resulting domain name too long\n";
$ttl += 0;
if ($ttl < $ttlmin) {
warn "input:$.:$owner:capping ttl $ttl at lower bound $ttlmin\n";
$ttl=$ttlmin;
}
if ($ttl > $ttlmax) {
warn "input:$.:$owner:capping ttl $ttl at upper bound $ttlmax\n";
$ttl=$ttlmax;
}
$type =~ y/a-z/A-Z/;
die "input:$.:$owner:rr type not permitted:$type\n"
unless $rrt_allowed{$type};
if (exists $rrset_ttl{$owner,$type}) {
die "input:$.:$owner:$type:RRset has varying TTLs\n"
unless $rrset_ttl{$owner,$type} == $ttl;
} else {
$rrset_ttl{$owner,$type}= $ttl;
}
die "input:$.:$owner:CNAME and other records, or multiple CNAMEs\n"
if $type eq 'CNAME'
? exists $owner_types{$owner}
: exists $owner_types{$owner}->{'CNAME'};
if ($type eq 'A') {
defined($addr= inet_aton $_) or
die "input:$.:$owner:invalid IP address\n";
$data= inet_ntoa($addr);
} elsif ($type eq 'AAAA') {
defined($addr= inet_pton(AF_INET6, $_)) or
die "input:$.:$owner:invalid IPv6 address\n";
$data = inet_ntop(AF_INET6, $addr);
} elsif ($type eq 'CNAME') {
$data= domainsyntax_rel("input:$.:$owner:canonical name",$_).".";
} elsif ($type eq 'MX') {
m/^(\d+)\s+(\S+)$/ or die "input:$.:$owner:invalid MX syntax\n";
($pref,$target) = ($1,$2);
$pref += 0;
die "input:$.:$owner:invalid MX preference\n"
if $pref<0 || $pref>65535;
$target= domainsyntax_rel("input:$.:$owner:mail exchanger",$target);
$data= "$pref $target.";
} else {
die "input:$.:$owner:unsupported RR type:$type\n";
}
$owner_types{$owner}->{$type}= 1;
print T "$write_owner $ttl $type $data\n"
or die "write data to temp file:$!\n";
}
close T or die "close RR data include:$!\n";
open STDIN, "< tmp/$$" or die "reopen RR data include:$!\n";
remove "tmp/$$" or die "close RR data include:$!\n";
chdir "zone,$zone" or die "chdir:$zone:$!\n";
exec "with-lock-ex","-w","Lock",
"$libdir/update", $zone, $subdomain, @rates;
die "execute update program:$!\n";
sub domainsyntax ($$) {
my ($w,$d) = @_;
return if eval {
die "bad char:\`$&'\n" if $d =~ m/[^-.0-9a-z]/;
$d= ".$d.";
die "label starts with hyphen\n" if $d =~ m/\.\-/;
die "label ends with hyphen\n" if $d =~ m/\-\./;
die "empty label or dot at start or end\n" if $d =~ m/\.\./;
die "label too long\n" if $d =~ m/\..{64,}\./;
die "domain name too long\n" if length $d > 255;
1;
};
die "$w:invalid domain name:\`$d':$@";
}
sub domainsyntax_rel ($$) {
my ($w,$d,$r) = @_;
unless ($d =~ s/\.$//) {
$d .= '.' unless $d =~ s/^\@$//;
$d .= ($subdomain eq '@' ? "$zone" : "$subdomain.$zone");
}
domainsyntax($w,$d);
return $d;
}
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