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postfixadmin/VIRTUAL_VACATION/vacation.pl

386 lines
12 KiB
Perl

#!/usr/bin/perl -w
#
# Virtual Vacation 3.1
# by Mischa Peters <mischa at high5 dot net>
# Copyright (c) 2002 - 2005 High5!
# Licensed under GPL for more info check GPL-LICENSE.TXT
#
# Additions:
# 2004/07/13 David Osborn <ossdev at daocon.com>
# strict, processes domain level aliases, more
# subroutines, send reply from original to address
#
# 2004/11/09 David Osborn <ossdev at daocon.com>
# Added syslog support
# Slightly better logging which includes messageid
# Avoid infinite loops with domain aliases
#
# 2005-01-19 Troels Arvin <troels@arvin.dk>
# PostgreSQL-version.
# Normalized DB schema from one vacation table ("vacation")
# to two ("vacation", "vacation_notification"). Uses
# referential integrity CASCADE action to simplify cleanup
# when a user is no longer on vacation.
# Inserting variables into queries stricly by prepare()
# to try to avoid SQL injection.
# International characters are now handled well.
#
# 2005-01-21 Troels Arvin <troels@arvin.dk>
# Uses the Email::Valid package to avoid sending notices
# to obviously invalid addresses.
#
# 2007-08-15 David Goodwin <david@palepurple.co.uk>
# Use the Perl Mail::Sendmail module for sending mail
# Check for headers that start with blank lines (patch from forum)
#
# 2007-08-20 Martin Ambroz <amsys@trustica.cz>
# Added initial Unicode support
#
# 2008-05-09 Fabio Bonelli <fabiobonelli@libero.it>
# Properly handle failed queries to vacation_notification.
# Fixed log reporting.
#
# Requirements:
# You need to have the DBD::Pg or DBD::mysql perl-module installed.
# You need to have the Mail::Sendmail module installed.
# You need to have the Email::Valid module installed.
# You need to have the MIME::Charset module installed.
# You need to have the MIME::EncWords module installed.
#
# On Debian based systems :
# libmail-sendmail-perl
# libdbd-pg-perl
# libemail-valid-perl
# libmime-perl
# libmime-charset-perl (currently in testing, see instructions below)
# libmime-encwords-perl (currently in testing, see instructions below)
#
# Note: When you use this module, you may start seeing error messages
# like "Cannot insert a duplicate key into unique index
# vacation_notification_pkey" in your system logs. This is expected
# behavior, and not an indication of trouble (see the "already_notified"
# subroutine for an explanation).
#
# You must also have the Email::Valid and MIME-tools perl-packages
# installed. They are available in some package collections, under the
# names 'perl-Email-Valid' and 'perl-MIME-tools', respectively.
# One such package collection (for Linux) is:
# http://dag.wieers.com/home-made/apt/packages.php
#
# ========== begin configuration ==========
# IMPORTANT: If you put passwords into this script, then remember
# to restrict access to the script, so that only the vacation user
# can read it.
# db_type - uncomment one of these
my $db_type = 'Pg';
#my $db_type = 'mysql';
# leave empty for connection via UNIX socket
my $db_host = '';
# connection details
my $db_username = 'vacation';
my $db_password = '';
my $db_name = 'postfix';
# smtp server used to send vacation e-mails
my $smtp_server = 'localhost';
my $syslog = 1;
# path to logfile, when empty logging is supressed
my $logfile='';
#my $logfile = "/var/log/vacation/vacation.log";
# path to file for debugging, debug supressed when empty
my $debugfile='';
#my $debugfile = "/var/log/vacation/vacation.debug";
# =========== end configuration ===========
use DBI;
use MIME::Base64;
use MIME::EncWords qw(:all);
use Email::Valid;
use strict;
use Mail::Sendmail;
binmode (STDIN,':utf8');
my $dbh;
if ($db_host) {
$dbh = DBI->connect("DBI:$db_type:dbname=$db_name;host=$db_host","$db_username", "$db_password", { RaiseError => 1 });
} else {
$dbh = DBI->connect("DBI:$db_type:dbname=$db_name","$db_username", "$db_password", { RaiseError => 1 });
}
if (!$dbh) {
panic("Could not connect to database");
exit(0);
}
my $db_true; # MySQL and PgSQL use different values for TRUE
if ($db_type eq "mysql") {
$dbh->do("SET CHARACTER SET utf8;");
$db_true = '1';
} else { # Pg
# TODO: SET CHARACTER SET is mysql only, needs FIX for ALL databases
$db_true = 'True';
}
# used to detect infinite address lookup loops
my $loopcount=0;
sub do_debug {
if ( $debugfile ) {
my $date;
open (DEBUG, ">> $debugfile") or die ("Unable to open debug file");
binmode (DEBUG, ':utf8');
chop ($date = `date "+%Y/%m/%d %H:%M:%S"`);
print DEBUG "====== $date ======\n";
my $i;
for ($i=0;$i<$#_;$i++) {
print DEBUG $_[$i], ' | ';
}
print DEBUG $_[($#_)], "\n";
close (DEBUG);
}
}
sub already_notified {
my ($to, $from) = @_;
my $query = qq{INSERT into vacation_notification (on_vacation,notified) values (?,?)};
my $stm = $dbh->prepare($query);
if (!$stm) {
do_log('',$to,$from,'',"Could not prepare query $query");
return 1;
}
$stm->{'PrintError'} = 0;
$stm->{'RaiseError'} = 0;
if (!$stm->execute($to,$from)) {
my $e=$dbh->errstr;
# Violation of a primay key constraint may happen here, and that's
# fine. All other error conditions are not fine, however.
if ($e !~ /_pkey/) {
do_log('',$to,$from,'',"Unexpected error: '$e' from query '$query'");
# Let's play safe and notify anyway
return 0;
}
return 1;
}
return 0;
}
sub do_log {
my ($messageid, $to, $from, $subject, $logmessage) = @_;
my $date;
if ( $syslog ) {
open (SYSLOG, "|/usr/bin/logger -p mail.info -t Vacation") or die ("Unable to open logger");
binmode(SYSLOG, ':utf8');
if ($logmessage) {
printf SYSLOG "Orig-To: %s From: %s MessageID: %s Subject: %s. Log message: %s", $to, $from, $messageid, $subject, $logmessage;
} else {
printf SYSLOG "Orig-To: %s From: %s MessageID: %s Subject: %s", $to, $from, $messageid, $subject;
}
close (SYSLOG);
}
if ( $logfile ) {
open (LOG, ">> $logfile") or die ("Unable to open log file");
binmode (LOG, ':utf8');
chop ($date = `date "+%Y/%m/%d %H:%M:%S"`);
if ($logmessage) {
print LOG "$date: To: $to From: $from Subject: $subject MessageID: $messageid. Log message: $logmessage\n";
} else {
print LOG "$date: To: $to From: $from Subject: $subject MessageID: $messageid\n";
}
close (LOG);
}
}
sub do_mail {
# from, to, subject, body
my ($from, $to, $subject, $body) = @_;
my $vacation_subject = encode_mimewords($subject, 'Encoding'=> 'q', 'Charset'=>'utf-8', 'Field'=>'Subject');
my %mail;
%mail = (
'smtp' => $smtp_server,
'Subject' => $vacation_subject,
'From' => $from,
'To' => $to,
'MIME-Version' => '1.0',
'Content-Type' => 'text/plain; charset=UTF-8',
'Content-Transfer-Encoding' => 'base64',
'Precedence' => 'junk',
'X-Loop' => 'Postfix Admin Virtual Vacation',
'Message' => encode_base64($body)
);
sendmail(%mail) or do_log($Mail::Sendmail::error);
do_debug('Mail::Sendmail said :' . $Mail::Sendmail::log);
}
sub panic {
my ($arg) = @_;
do_log('','','','',"$arg");
exit(0);
}
sub panic_prepare {
my ($arg) = @_;
do_log('','','','',"Could not prepare '$arg'");
exit(0);
}
sub panic_execute {
my ($arg,$param) = @_;
do_log('','','','',"Could not execute '$arg' with parameters $param");
exit(0);
}
sub find_real_address {
my ($email) = @_;
if (++$loopcount > 20) {
do_log ("find_real_address loop!", "currently: $email", "ERROR", "ERROR");
panic("possible infinite loop in find_real_address for <$email>. Check for alias loop\n");
}
my $realemail;
my $query = qq{SELECT email FROM vacation WHERE email=? and active=$db_true};
my $stm = $dbh->prepare($query) or panic_prepare($query);
$stm->execute($email) or panic_execute($query,"email='$email'");
my $rv = $stm->rows;
# Recipient has vacation
if ($rv == 1) {
$realemail = $email;
} else {
$query = qq{SELECT goto FROM alias WHERE address=?};
$stm = $dbh->prepare($query) or panic_prepare($query);
$stm->execute($email) or panic_execute($query,"address='$email'");
$rv = $stm->rows;
# Recipient is an alias, check if mailbox has vacation
if ($rv == 1) {
my @row = $stm->fetchrow_array;
my $alias = $row[0];
$query = qq{SELECT email FROM vacation WHERE email=? and active=$db_true};
$stm = $dbh->prepare($query) or panic_prepare($query);
$stm->execute($alias) or panic_prepare($query,"email='$alias'");
$rv = $stm->rows;
# Alias has vacation
if ($rv == 1) {
$realemail = $alias;
}
# We still have to look for domain level aliases...
} else {
my ($user, $domain) = split(/@/, $email);
$query = qq{SELECT goto FROM alias WHERE address=?};
$stm = $dbh->prepare($query) or panic_prepare($query);
$stm->execute("\@$domain") or panic_execute($query,"address='\@$domain'");
$rv = $stm->rows;
# The receipient has a domain level alias
if ($rv == 1) {
my @row = $stm->fetchrow_array;
my $wildcard_dest = $row[0];
my ($wilduser, $wilddomain) = split(/@/, $wildcard_dest);
# Check domain alias
if ($wilduser) {
($rv, $realemail) = find_real_address ($wildcard_dest);
} else {
my $new_email = $user . '@' . $wilddomain;
($rv, $realemail) = find_real_address ($new_email);
}
}
}
}
return ($rv, $realemail);
}
sub send_vacation_email {
my ($email, $orig_from, $orig_to, $orig_messageid) = @_;
my $query = qq{SELECT subject,body FROM vacation WHERE email=?};
my $stm = $dbh->prepare($query) or panic_prepare($query);
$stm->execute($email) or panic_execute($query,"email='$email'");
my $rv = $stm->rows;
if ($rv == 1) {
my @row = $stm->fetchrow_array;
if (already_notified($email, $orig_from)) { return; }
do_debug ("[SEND RESPONSE] for $orig_messageid:\n", "FROM: $email (orig_to: $orig_to)\n", "TO: $orig_from\n", "VACATION SUBJECT: $row[0]\n", "VACATION BODY: $row[1]\n");
# do_mail(from, to, subject, body);
do_mail ($email, $orig_from, $row[0], $row[1]);
do_log ($orig_messageid, $orig_to, $orig_from, '');
}
}
########################### main #################################
my ($from, $to, $cc, $subject, $messageid, $lastheader);
$subject='';
$spam = 0;
# Take headers apart
while (<STDIN>) {
last if (/^$/);
if (/^\s+(.*)/ and $lastheader) { $$lastheader .= " $1"; }
elsif (/^from:\s+(.*)\n$/i) { $from = $1; $lastheader = \$from; }
elsif (/^to:\s+(.*)\n$/i) { $to = $1; $lastheader = \$to; }
elsif (/^cc:\s+(.*)\n$/i) { $cc = $1; $lastheader = \$cc; }
elsif (/^subject:\s+(.*)\n$/i) { $subject = $1; $lastheader = \$subject; }
elsif (/^message-id:\s+(.*)\n$/i) { $messageid = $1; $lastheader = \$messageid; }
elsif (/^x-spam-(flag|status):\s+yes/i) { exit (0); }
elsif (/^precedence:\s+(bulk|list|junk)/i) { exit (0); }
elsif (/^x-loop:\s+postfix\ admin\ virtual\ vacation/i) { exit (0); }
else {$lastheader = "" ; }
}
# If either From: or To: are not set, exit
if (!$from || !$to || !$messageid) { exit (0); }
$from = lc ($from);
if (!Email::Valid->address($from,-mxcheck => 1)) { do_debug("Invalid from email address: $from; exiting."); exit(0); }
# Check if it's an obvious sender, exit
if ($from =~ /([\w\-.%]+\@[\w.-]+)/) { $from = $1; }
if ($from eq "" || $from =~ /^owner-|-(request|owner)\@|^(mailer-daemon|postmaster)\@/i) { exit (0); }
# Strip To: and Cc: and push them in array
my @strip_cc_array;
my @strip_to_array = split(/, */, lc ($to) );
if (defined $cc) { @strip_cc_array = split(/, */, lc ($cc) ); }
push (@strip_to_array, @strip_cc_array);
my @search_array;
# Strip email address from headers
for (@strip_to_array) {
if ($_ =~ /([\w\-.%]+\@[\w.-]+)/) {
push (@search_array, $1);
do_debug ("[STRIP RECIPIENTS]: ", $messageid, $1);
}
}
# Search for email address which has vacation
for (@search_array) {
/([\w\-.%]+\@[\w.-]+)/ or next;
my $addr = $1;
my ($rv, $email) = find_real_address ($addr);
if ($rv == 1) {
do_debug ("[FOUND VACATION]: ", $messageid, $from, $to, $email);
send_vacation_email( $email, $from, $to, $messageid);
}
}
0;
#/* vim: set expandtab softtabstop=3 tabstop=3 shiftwidth=3: */