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#!/usr/bin/perl
# autoreply.pl
# Simple autoreply script. Command line arguments are :
# autoreply-file username alternate-file
# Read sendmail module config
$ENV{'PATH'} = "/bin:/usr/bin:/sbin:/usr/sbin";
$p = -l $0 ? readlink($0) : $0;
$p =~ /^(.*)\/[^\/]+$/;
$moddir = $1;
%config = &read_config_file("$moddir/config");
# If this isn't the sendmail module, try it
if (!$config{'sendmail_path'} || !-x $config{'sendmail_path'}) {
$moddir =~ s/([^\/]+)$/sendmail/;
%config = &read_config_file("$moddir/config");
}
if (!$config{'sendmail_path'} || !-x $config{'sendmail_path'}) {
# Make some guesses about sendmail
if (-x "/usr/sbin/sendmail") {
%config = ( 'sendmail_path' => '/usr/sbin/sendmail' );
}
elsif (-x "/usr/local/sbin/sendmail") {
%config = ( 'sendmail_path' => '/usr/local/sbin/sendmail' );
}
elsif (-x "/opt/csw/lib/sendmail") {
%config = ( 'sendmail_path' => '/opt/csw/lib/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
$lnum = 0;
while(<STDIN>) {
$headers .= $_;
s/\r|\n//g;
if (/^From\s+(\S+)/ && $lnum == 0) {
# Magic From line
$fromline = $1;
}
elsif (/^(\S+):\s+(.*)/) {
$header{lc($1)} = $2;
$lastheader = lc($1);
}
elsif (/^\s+(.*)/ && $lastheader) {
$header{$lastheader} .= $_;
}
elsif (!$_) { last; }
$lnum++;
}
while(<STDIN>) {
$body .= $_;
}
if ($header{'x-webmin-autoreply'} ||
$header{'auto-submitted'} && lc($header{'auto-submitted'}) ne 'no') {
print STDERR "Cancelling autoreply to an autoreply\n";
exit 0;
}
if ($header{'x-mailing-list'} ||
$header{'list-id'} ||
$header{'precedence'} =~ /junk|bulk|list/i ||
$header{'to'} =~ /Multiple recipients of/i ||
$header{'from'} =~ /majordomo/i ||
$fromline =~ /majordomo/i) {
# Do nothing if post is from a mailing list
exit 0;
}
if ($header{'from'} =~ /postmaster|mailer-daemon/i ||
$fromline =~ /postmaster|mailer-daemon|<>/ ) {
# Do nothing if post is a bounce
exit 0;
}
# if spamassassin is installed, feed the email to it
$spam = &has_command("spamassassin");
if ($spam) {
$temp = "/tmp/autoreply.spam.$$";
unlink($temp);
open(SPAM, "| $spam >$temp 2>/dev/null");
print SPAM $headers;
print SPAM $body;
close(SPAM);
$isspam = undef;
open(SPAMOUT, $temp);
while(<SPAMOUT>) {
if (/^X-Spam-Status:\s+Yes/i) {
$isspam = 1;
last;
}
last if (!/\S/);
}
close(SPAMOUT);
unlink($temp);
if ($isspam) {
print STDERR "Not autoreplying to spam\n";
exit 0;
}
}
# work out the correct to address
@to = ( &split_addresses($header{'to'}),
&split_addresses($header{'cc'}),
&split_addresses($header{'bcc'}) );
$to = $to[0]->[0];
foreach $t (@to) {
if ($t->[0] =~ /^([^\@\s]+)/ && $1 eq $ARGV[1] ||
$t->[0] eq $ARGV[1]) {
$to = $t->[0];
}
}
# build list of default reply headers
$rheader{'From'} = $to;
$rheader{'To'} = $header{'reply-to'} ? $header{'reply-to'}
: $header{'from'};
$rheader{'Subject'} = "Autoreply to $header{'subject'}";
$rheader{'X-Webmin-Autoreply'} = 1;
$rheader{'X-Originally-To'} = $header{'to'};
chop($host = `hostname`);
$rheader{'Message-Id'} = "<".time().".".$$."\@".$host.">";
# read the autoreply file (or alternate)
if (open(AUTO, $ARGV[0]) ||
$ARGV[2] && open(AUTO, $ARGV[2])) {
while(<AUTO>) {
s/\$SUBJECT/$header{'subject'}/g;
s/\$FROM/$header{'from'}/g;
s/\$TO/$to/g;
s/\$DATE/$header{'date'}/g;
s/\$BODY/$body/g;
if (/^(\S+):\s*(.*)/ && !$doneheaders) {
if ($1 eq "No-Autoreply-Regexp") {
push(@no_regexp, $2);
}
elsif ($1 eq "Autoreply-File") {
push(@files, $2);
}
else {
$rheader{$1} = $2;
$rheaders .= $_;
}
}
else {
$rbody .= $_;
$doneheaders = 1;
}
}
close(AUTO);
}
else {
$rbody = "Failed to open autoreply file $ARGV[0] : $!";
}
# Open the replies tracking DBM, if one was set
if ($rheader{'Reply-Tracking'}) {
$track_replies = dbmopen(%replies, $rheader{'Reply-Tracking'}, 0700);
}
if ($track_replies) {
# See if we have replied to this address before
$period = $rheader{'Reply-Period'} || 60*60;
($from) = &split_addresses($header{'from'});
if ($from) {
$lasttime = $replies{$from->[0]};
$now = time();
if ($now < $lasttime+$period) {
# Autoreplied already in this period .. just halt
exit(0);
}
$replies{$from->[0]} = $now;
}
}
delete($rheader{'Reply-Tracking'});
delete($rheader{'Reply-Period'});
# Check if we are within the requested time range
if ($rheader{'Autoreply-Start'} && time() < $rheader{'Autoreply-Start'} ||
$rheader{'Autoreply-End'} && time() > $rheader{'Autoreply-End'}) {
# Nope .. so do nothing
exit 0;
}
delete($rheader{'Autoreply-Start'});
delete($rheader{'Autoreply-End'});
# Check if there is a deny list, and if so don't send a reply
@fromsplit = &split_addresses($header{'from'});
if (@fromsplit) {
$from = $fromsplit[0]->[0];
($fromuser, $fromdom) = split(/\@/, $from);
foreach $n (split(/\s+/, $rheader{'No-Autoreply'})) {
if ($n =~ /^(\S+)\@(\S+)$/ && lc($from) eq lc($n) ||
$n =~ /^\*\@(\S+)$/ && lc($fromdom) eq lc($1) ||
$n =~ /^(\S+)\@\*$/ && lc($fromuser) eq lc($1) ||
$n =~ /^\*\@\*(\S+)$/ && lc($fromdom) =~ /$1$/i ||
$n =~ /^(\S+)\@\*(\S+)$/ && lc($fromuser) eq lc($1) &&
lc($fromdom) =~ /$2$/i) {
exit(0);
}
}
delete($rheader{'No-Autoreply'});
}
# Check if message matches one of the deny regexps
foreach $re (@no_regexp) {
if ($re =~ /\S/ && $rheaders =~ /$re/i) {
print STDERR "Skipping due to match on $re\n";
exit(1);
}
}
# Read attached files
foreach $f (@files) {
local $/ = undef;
if (!open(FILE, $f)) {
print STDERR "Failed to open $f : $!\n";
exit(1);
}
$data = <FILE>;
close(FILE);
$f =~ s/^.*\///;
$type = &guess_mime_type($f)."; name=\"$f\"";
$disp = "inline; filename=\"$f\"";
push(@attach, { 'headers' => [ [ 'Content-Type', $type ],
[ 'Content-Disposition', $disp ],
[ 'Content-Transfer-Encoding', 'base64' ]
],
'data' => $data });
}
# Work out the content type and encoding
$type = $rbody =~ /<html[^>]*>|<body[^>]*>/i ? "text/html" : "text/plain";
$cs = $rheader{'Charset'};
delete($rheader{'Charset'});
if ($rbody =~ /[\177-\377]/) {
# High-ascii
$enc = "quoted-printable";
$encrbody = "ed_encode($rbody);
$type .= "; charset=".($cs || "iso-8859-1");
}
else {
$enc = undef;
$encrbody = $rbody;
$type .= "; charset=$cs" if ($cs);
}
# run sendmail and feed it the reply
($rfrom) = &split_addresses($rheader{'From'});
if ($rfrom->[0]) {
open(MAIL, "|$config{'sendmail_path'} -t -f$rfrom->[0]");
}
else {
open(MAIL, "|$config{'sendmail_path'} -t -f$to");
}
foreach $h (keys %rheader) {
print MAIL "$h: $rheader{$h}\n";
}
# Create the message body
if (!@attach) {
# Just text, so no encoding is needed
if ($enc) {
print MAIL "Content-Transfer-Encoding: $enc\n";
}
if (!$rheader{'Content-Type'}) {
print MAIL "Content-Type: $type\n";
}
print MAIL "\n";
print MAIL $encrbody;
}
else {
# Need to send a multi-part MIME message
print MAIL "MIME-Version: 1.0\n";
$bound = "bound".time();
$ctype = "multipart/mixed";
print MAIL "Content-Type: $ctype; boundary=\"$bound\"\n";
print MAIL "\n";
$bodyattach = { 'headers' => [ [ 'Content-Type', $type ], ],
'data' => $encrbody };
if ($enc) {
push(@{$bodyattach->{'headers'}},
[ 'Content-Transfer-Encoding', $enc ]);
}
splice(@attach, 0, 0, $bodyattach);
# Send attachments
print MAIL "This is a multi-part message in MIME format.","\n";
$lnum++;
foreach $a (@attach) {
print MAIL "\n";
print MAIL "--",$bound,"\n";
local $enc;
foreach $h (@{$a->{'headers'}}) {
print MAIL $h->[0],": ",$h->[1],"\n";
$enc = $h->[1]
if (lc($h->[0]) eq 'content-transfer-encoding');
$lnum++;
}
print MAIL "\n";
$lnum++;
if (lc($enc) eq 'base64') {
local $enc = &encode_base64($a->{'data'});
$enc =~ s/\r//g;
print MAIL $enc;
}
else {
$a->{'data'} =~ s/\r//g;
$a->{'data'} =~ s/\n\.\n/\n\. \n/g;
print MAIL $a->{'data'};
if ($a->{'data'} !~ /\n$/) {
print MAIL "\n";
}
}
}
print MAIL "\n";
print MAIL "--",$bound,"--","\n";
print MAIL "\n";
}
close(MAIL);
# split_addresses(string)
# Splits a comma-separated list of addresses into [ email, real-name, original ]
# triplets
sub split_addresses
{
local (@rv, $str = $_[0]);
while(1) {
if ($str =~ /^[\s,]*(([^<>\(\)\s]+)\s+\(([^\(\)]+)\))(.*)$/) {
# An address like foo@bar.com (Fooey Bar)
push(@rv, [ $2, $3, $1 ]);
$str = $4;
}
elsif ($str =~ /^[\s,]*("([^"]+)"\s*<([^\s<>,]+)>)(.*)$/ ||
$str =~ /^[\s,]*(([^<>\@]+)\s+<([^\s<>,]+)>)(.*)$/ ||
$str =~ /^[\s,]*(([^<>\@]+)<([^\s<>,]+)>)(.*)$/ ||
$str =~ /^[\s,]*(([^<>\[\]]+)\s+\[mailto:([^\s\[\]]+)\])(.*)$/||
$str =~ /^[\s,]*(()<([^<>,]+)>)(.*)/ ||
$str =~ /^[\s,]*(()([^\s<>,]+))(.*)/) {
# Addresses like "Fooey Bar" <foo@bar.com>
# Fooey Bar <foo@bar.com>
# Fooey Bar<foo@bar.com>
# Fooey Bar [mailto:foo@bar.com]
# <foo@bar.com>
# <group name>
# foo@bar.com
push(@rv, [ $3, $2 eq "," ? "" : $2, $1 ]);
$str = $4;
}
else {
last;
}
}
return @rv;
}
# encode_base64(string)
# Encodes a string into base64 format
sub encode_base64
{
local $res;
pos($_[0]) = 0; # ensure start at the beginning
while ($_[0] =~ /(.{1,57})/gs) {
$res .= substr(pack('u57', $1), 1)."\n";
chop($res);
}
$res =~ tr|\` -_|AA-Za-z0-9+/|;
local $padding = (3 - length($_[0]) % 3) % 3;
$res =~ s/.{$padding}$/'=' x $padding/e if ($padding);
return $res;
}
# guess_mime_type(filename)
sub guess_mime_type
{
local ($file) = @_;
return $file =~ /\.gif/i ? "image/gif" :
$file =~ /\.(jpeg|jpg)/i ? "image/jpeg" :
$file =~ /\.txt/i ? "text/plain" :
$file =~ /\.(htm|html)/i ? "text/html" :
$file =~ /\.doc/i ? "application/msword" :
$file =~ /\.xls/i ? "application/vnd.ms-excel" :
$file =~ /\.ppt/i ? "application/vnd.ms-powerpoint" :
$file =~ /\.(mpg|mpeg)/i ? "video/mpeg" :
$file =~ /\.avi/i ? "video/x-msvideo" :
$file =~ /\.(mp2|mp3)/i ? "audio/mpeg" :
$file =~ /\.wav/i ? "audio/x-wav" :
"application/octet-stream";
}
sub read_config_file
{
local %config;
if (open(CONF, $_[0])) {
while(<CONF>) {
if (/^(\S+)=(.*)/) {
$config{$1} = $2;
}
}
close(CONF);
}
return %config;
}
# quoted_encode(text)
# Encodes text to quoted-printable format
sub quoted_encode
{
local $t = $_[0];
$t =~ s/([=\177-\377])/sprintf("=%2.2X",ord($1))/ge;
return $t;
}
sub has_command
{
local ($cmd) = @_;
if ($cmd =~ /^\//) {
return -x $cmd ? $cmd : undef;
}
else {
foreach my $d (split(":", $ENV{'PATH'}), "/usr/bin", "/usr/local/bin") {
return "$d/$cmd" if (-x "$d/$cmd");
}
return undef;
}
}
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