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#!/usr/bin/perl
# filter.pl
# read sendmail module config
$p = -l $0 ? readlink($0) : $0;
$p =~ /^(.*)\/[^\/]+$/;
if (open(CONF, "$1/config")) {
while(<CONF>) {
if (/^(\S+)=(.*)/) {
$config{$1} = $2;
}
}
close(CONF);
}
if (!$config{'sendmail_path'}) {
# Make some guesses about sendmail
if (-x "/usr/sbin/sendmail") {
%config = ( 'sendmail_path' => '/usr/sbin/sendmail' );
}
elsif (-x "/usr/lib/sendmail") {
%config = ( 'sendmail_path' => '/usr/lib/sendmail' );
}
else {
die "Failed to find sendmail or config file";
}
}
# read headers and body
$fromline = <STDIN>;
while(<STDIN>) {
$headers .= $_;
s/\r|\n//g;
if (/^(\S+):\s+(.*)/) {
$header{lc($1)} = $2;
}
elsif (!$_) { last; }
}
while(<STDIN>) {
if ($_ eq ".\n") {
# Single line with a . confuses SMTP
$body .= ". \n";
}
elsif ($_ eq ".\r\n") {
$body .= ". \r\n";
}
else {
$body .= $_;
}
}
# read the filter file
if (open(FILTER, $ARGV[0])) {
while(<FILTER>) {
s/\r|\n//g;
if (/^(\S+)\s+(\S+)\s+(\S+)\s+(.*)$/) {
push(@filter, [ $1, $2, $3, $4 ]);
}
elsif (/^(\S+)\s+(\S+)$/) {
push(@filter, [ $1, $2 ]);
}
}
close(FILTER);
}
else {
print STDERR "Filter file $ARGV[0] does not exist!\n";
exit 1;
}
# run the filter to find the first matching rule
open(LOG, ">>$ARGV[0].log");
foreach $f (@filter) {
local $field = $f->[2] eq 'body' ? $body : $header{$f->[2]};
local $st = 0;
if ($f->[0] == 0) {
$st = ($field !~ /$f->[3]/i);
}
elsif ($f->[0] == 1) {
$st = ($field =~ /$f->[3]/i);
}
elsif ($f->[0] == 2) {
$st = 1;
}
if ($st) {
# The rule matched!
if ($f->[1] =~ /^\//) {
# Write to a file
open(MAIL, ">>$f->[1]") || die "Failed to open $f->[1] ; $!";
print MAIL $fromline;
}
else {
# Forward to another address
open(MAIL, "|$config{'sendmail_path'} ".
quotemeta($f->[1]));
}
print MAIL $headers;
print MAIL $body;
close(MAIL);
$now = localtime(time());
print LOG "[$now] [$header{'from'}] [",join(" ",@$f),"]\n";
last;
}
}
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