byterazor/qpsmtpd
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Check if the domain name in a DNS response packet matches one of the

Browse Source 
domain names we queried.
See the thread "dnsbl or spamhaus occassionally blocks wrong IP" 
starting at 14 Mar 2006 for details.


git-svn-id: https://svn.perl.org/qpsmtpd/branches/0.3x@683 958fd67b-6ff1-0310-b445-bb7760255be9
This commit is contained in:
Peter J. Holzer 2006-12-16 09:46:12 +00:00
parent 72da879365
commit d6c428716f
1 changed files with 8 additions and 2 deletions
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10
plugins/dnsbl
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@ -57,8 +57,10 @@ sub hook_connect {
my $sel = IO::Select->new();
my $dom;
for my $dnsbl (keys %dnsbl_zones) {
# fix to find A records, if the dnsbl_zones line has a second field 20/1/04 ++msp
$dom->{"$reversed_ip.$dnsbl"} = 1;
if (defined($dnsbl_zones{$dnsbl})) {
$self->log(LOGDEBUG, "Checking $reversed_ip.$dnsbl for A record in the background");
$sel->add($res->bgsend("$reversed_ip.$dnsbl"));
@ -69,6 +71,7 @@ sub hook_connect {
}
$self->qp->connection->notes('dnsbl_sockets', $sel);
$self->qp->connection->notes('dnsbl_domains', $dom);
return DECLINED;
}
@ -88,6 +91,7 @@ sub process_sockets {
$res->udp_timeout(30);
my $sel = $conn->notes('dnsbl_sockets') or return "";
my $dom = $conn->notes('dnsbl_domains');
my $remote_ip = $self->qp->connection->remote_ip;
my $result;
@ -110,11 +114,13 @@ sub process_sockets {
if ($query) {
my $a_record = 0;
foreach my $rr ($query->answer) {
$a_record = 1 if $rr->type eq "A";
my $name = $rr->name;
$self->log(LOGDEBUG, "name $name");
next unless $dom->{$name};
$self->log(LOGDEBUG, "name $name was queried");
$a_record = 1 if $rr->type eq "A";
($dnsbl) = ($name =~ m/(?:\d+\.){4}(.*)/) unless $dnsbl;
$dnsbl = $name unless $dnsbl;
$self->log(LOGDEBUG, "name ", $rr->name);
next unless $rr->type eq "TXT";
$self->log(LOGDEBUG, "got txt record");
$result = $rr->txtdata and last;