624 lines
21 KiB
Perl
624 lines
21 KiB
Perl
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#!/usr/bin/perl
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# Original plugin by slerena@gmail.com, (c) 2012. based on Sendmail.pm library
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use strict;
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use vars qw(
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$VERSION
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%mailcfg
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$address_rx
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$debug
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$log
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$error
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$retry_delay
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$connect_retries
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$auth_support
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);
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use Socket;
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use Time::Local; # for automatic time zone detection
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use Sys::Hostname; # for use of hostname in HELO
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sub get_param($) {
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my $param = shift;
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my $value = "";
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$param = "-".$param;
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for(my $i=0; $i<$#ARGV; $i++) {
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if ($ARGV[$i] eq $param) {
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$value = $ARGV[$i+1];
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last;
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}
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}
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return $value;
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}
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%mailcfg = (
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# List of SMTP servers:
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'smtp' => [ qw( localhost ) ],
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'from' => '', # default sender e-mail, used when no From header in mail
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'mime' => 1, # use MIME encoding by default
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'retries' => 1, # number of retries on smtp connect failure
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'delay' => 1, # delay in seconds between retries
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'tz' => '', # only to override automatic detection
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'port' => 25, # change it if you always use a non-standard port
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'debug' => 0 # prints stuff to STDERR
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);
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# *******************************************************************
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#use Digest::HMAC_MD5 qw(hmac_md5 hmac_md5_hex);
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$auth_support = 'DIGEST-MD5 CRAM-MD5 PLAIN LOGIN';
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# use MIME::QuotedPrint if available and configured in %mailcfg
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eval("use MIME::QuotedPrint");
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$mailcfg{'mime'} &&= (!$@);
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# regex for e-mail addresses where full=$1, user=$2, domain=$3
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# see pod documentation about this regex
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my $word_rx = '[\x21\x23-\x27\x2A-\x2B\x2D\x2F\w\x3D\x3F]+';
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my $user_rx = $word_rx # valid chars
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.'(?:\.' . $word_rx . ')*' # possibly more words preceded by a dot
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;
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my $dom_rx = '\w[-\w]*(?:\.\w[-\w]*)*'; # less valid chars in domain names
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my $ip_rx = '\[\d{1,3}(?:\.\d{1,3}){3}\]';
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$address_rx = '((' . $user_rx . ')\@(' . $dom_rx . '|' . $ip_rx . '))';
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; # v. 0.61
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sub _require_md5 {
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eval { require Digest::MD5; Digest::MD5->import(qw(md5 md5_hex)); };
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$error .= $@ if $@;
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return ($@ ? undef : 1);
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}
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sub _require_base64 {
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eval {
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require MIME::Base64; MIME::Base64->import(qw(encode_base64 decode_base64));
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};
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$error .= $@ if $@;
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return ($@ ? undef : 1);
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}
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sub _hmac_md5 {
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my ($pass, $ckey) = @_;
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my $size = 64;
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$pass = md5($pass) if length($pass) > $size;
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my $ipad = $pass ^ (chr(0x36) x $size);
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my $opad = $pass ^ (chr(0x5c) x $size);
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return md5_hex($opad, md5($ipad, $ckey));
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}
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sub _digest_md5 {
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my ($user, $pass, $challenge, $realm) = @_;
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my %ckey = map { /^([^=]+)="?(.+?)"?$/ } split(/,/, $challenge);
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$realm ||= $ckey{realm}; #($user =~ s/\@(.+)$//o) ? $1 : $server;
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my $nonce = $ckey{nonce};
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my $cnonce = &make_cnonce;
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my $uri = join('/', 'smtp', hostname()||'localhost', $ckey{realm});
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my $qop = 'auth';
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my $nc = '00000001';
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my($hv, $a1, $a2);
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$hv = md5("$user:$realm:$pass");
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$a1 = md5_hex("$hv:$nonce:$cnonce");
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$a2 = md5_hex("AUTHENTICATE:$uri");
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$hv = md5_hex("$a1:$nonce:$nc:$cnonce:$qop:$a2");
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return qq(username="$user",realm="$ckey{realm}",nonce="$nonce",nc=$nc,cnonce="$cnonce",digest-uri="$uri",response=$hv,qop=$qop);
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}
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sub make_cnonce {
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my $s = '' ;
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for(1..16) { $s .= chr(rand 256) }
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$s = encode_base64($s, "");
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$s =~ s/\W/X/go;
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return substr($s, 0, 16);
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}
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sub time_to_date {
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# convert a time() value to a date-time string according to RFC 822
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my $time = $_[0] || time(); # default to now if no argument
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my @months = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
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my @wdays = qw(Sun Mon Tue Wed Thu Fri Sat);
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my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)
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= localtime($time);
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my $TZ = $mailcfg{'tz'};
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if ( $TZ eq "" ) {
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# offset in hours
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my $offset = sprintf "%.1f", (timegm(localtime) - time) / 3600;
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my $minutes = sprintf "%02d", abs( $offset - int($offset) ) * 60;
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$TZ = sprintf("%+03d", int($offset)) . $minutes;
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}
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return join(" ",
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($wdays[$wday] . ','),
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$mday,
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$months[$mon],
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$year+1900,
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sprintf("%02d:%02d:%02d", $hour, $min, $sec),
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$TZ
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);
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} # end sub time_to_date
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sub sendmail {
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$error = '';
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$log = "Mail::Sendmail v. $VERSION - " . scalar(localtime()) . "\n";
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my $CRLF = "\015\012";
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local $/ = $CRLF;
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local $\ = ''; # to protect us from outside settings
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local $_;
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my (%mail, $k,
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$smtp, $server, $port, $connected, $localhost,
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$fromaddr, $recip, @recipients, $to, $header,
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%esmtp, @wanted_methods,
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);
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use vars qw($server_reply);
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# -------- a few internal subs ----------
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sub fail {
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# things to do before returning a sendmail failure
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$error .= join(" ", @_) . "\n";
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if ($server_reply) {
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$error .= "Server said: $server_reply\n";
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print STDERR "Server said: $server_reply\n" if $^W;
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}
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close S;
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return 0;
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}
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sub socket_write {
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my $i;
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for $i (0..$#_) {
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# accept references, so we don't copy potentially big data
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my $data = ref($_[$i]) ? $_[$i] : \$_[$i];
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if ($mailcfg{'debug'} > 5) {
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if (length($$data) < 500) {
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print ">", $$data;
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}
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else {
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print "> [...", length($$data), " bytes sent ...]\n";
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}
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}
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print(S $$data) || return 0;
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}
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1;
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}
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sub socket_read {
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$server_reply = "";
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do {
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$_ = <S>;
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$server_reply .= $_;
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#chomp $_;
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print "<$_" if $mailcfg{'debug'} > 5;
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if (/^[45]/ or !$_) {
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chomp $server_reply;
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return; # return false
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}
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} while (/^[\d]+-/);
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chomp $server_reply;
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return $server_reply;
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}
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# -------- end of internal subs ----------
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# all config keys to lowercase, to prevent typo errors
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foreach $k (keys %mailcfg) {
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if ($k =~ /[A-Z]/) {
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$mailcfg{lc($k)} = $mailcfg{$k};
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}
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}
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# redo mail hash, arranging keys case etc...
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while (@_) {
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$k = shift @_;
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if (!$k and $^W) {
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warn "Received false mail hash key: \'$k\'. Did you forget to put it in quotes?\n";
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}
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# arrange keys case
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$k = ucfirst lc($k);
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$k =~ s/\s*:\s*$//o; # kill colon (and possible spaces) at end, we add it later.
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# uppercase also after "-", so people don't complain that headers case is different
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# than in Outlook.
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$k =~ s/-(.)/"-" . uc($1)/ge;
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$mail{$k} = shift @_;
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if ($k !~ /^(Message|Body|Text)$/i) {
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# normalize possible line endings in headers
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$mail{$k} =~ s/\015\012?/\012/go;
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$mail{$k} =~ s/\012/$CRLF/go;
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}
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}
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$smtp = $mail{'Smtp'} || $mail{'Server'};
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unshift @{$mailcfg{'smtp'}}, $smtp if ($smtp and $mailcfg{'smtp'}->[0] ne $smtp);
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# delete non-header keys, so we don't send them later as mail headers
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# I like this syntax, but it doesn't seem to work with AS port 5.003_07:
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# delete @mail{'Smtp', 'Server'};
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# so instead:
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delete $mail{'Smtp'}; delete $mail{'Server'};
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$mailcfg{'port'} = $mail{'Port'} || $mailcfg{'port'} || 25;
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delete $mail{'Port'};
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my $auth = $mail{'Auth'};
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delete $mail{'Auth'};
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{ # don't warn for undefined values below
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local $^W = 0;
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$mail{'Message'} = join("", $mail{'Message'}, $mail{'Body'}, $mail{'Text'});
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}
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# delete @mail{'Body', 'Text'};
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delete $mail{'Body'}; delete $mail{'Text'};
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# Extract 'From:' e-mail address to use as envelope sender
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$fromaddr = $mail{'Sender'} || $mail{'From'} || $mailcfg{'from'};
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#delete $mail{'Sender'};
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unless ($fromaddr =~ /$address_rx/) {
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return fail("Bad or missing From address: \'$fromaddr\'");
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}
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$fromaddr = $1;
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# add Date header if needed
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$mail{Date} ||= time_to_date() ;
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$log .= "Date: $mail{Date}\n";
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# cleanup message, and encode if needed
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$mail{'Message'} =~ s/\r\n/\n/go; # normalize line endings, step 1 of 2 (next step after MIME encoding)
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$mail{'Mime-Version'} ||= '1.0';
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$mail{'Content-Type'} ||= 'text/plain; charset="iso-8859-1"';
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unless ( $mail{'Content-Transfer-Encoding'}
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|| $mail{'Content-Type'} =~ /multipart/io )
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{
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if ($mailcfg{'mime'}) {
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$mail{'Content-Transfer-Encoding'} = 'quoted-printable';
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$mail{'Message'} = encode_qp($mail{'Message'});
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}
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else {
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$mail{'Content-Transfer-Encoding'} = '8bit';
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if ($mail{'Message'} =~ /[\x80-\xFF]/o) {
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$error .= "MIME::QuotedPrint not present!\nSending 8bit characters, hoping it will come across OK.\n";
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warn "MIME::QuotedPrint not present!\n",
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"Sending 8bit characters without encoding, hoping it will come across OK.\n"
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if $^W;
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}
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}
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}
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$mail{'Message'} =~ s/^\./\.\./gom; # handle . as first character
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$mail{'Message'} =~ s/\n/$CRLF/go; # normalize line endings, step 2.
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# Get recipients
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{ # don't warn for undefined values below
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local $^W = 0;
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$recip = join(", ", $mail{To}, $mail{Cc}, $mail{Bcc});
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}
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delete $mail{'Bcc'};
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@recipients = ();
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while ($recip =~ /$address_rx/go) {
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push @recipients, $1;
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}
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unless (@recipients) {
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return fail("No recipient!")
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}
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# get local hostname for polite HELO
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$localhost = hostname() || 'localhost';
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foreach $server ( @{$mailcfg{'smtp'}} ) {
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# open socket needs to be inside this foreach loop on Linux,
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# otherwise all servers fail if 1st one fails !??! why?
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unless ( socket S, AF_INET, SOCK_STREAM, scalar(getprotobyname 'tcp') ) {
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return fail("socket failed ($!)")
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}
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print "- trying $server\n" if $mailcfg{'debug'} > 1;
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$server =~ s/\s+//go; # remove spaces just in case of a typo
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# extract port if server name like "mail.domain.com:2525"
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$port = ($server =~ s/:(\d+)$//o) ? $1 : $mailcfg{'port'};
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$smtp = $server; # save $server for use outside foreach loop
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my $smtpaddr = inet_aton $server;
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unless ($smtpaddr) {
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$error .= "$server not found\n";
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next; # next server
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}
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my $retried = 0; # reset retries for each server
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while ( ( not $connected = connect S, pack_sockaddr_in($port, $smtpaddr) )
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and ( $retried < $mailcfg{'retries'} )
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) {
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$retried++;
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$error .= "connect to $server failed ($!)\n";
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print "- connect to $server failed ($!)\n" if $mailcfg{'debug'} > 1;
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print "retrying in $mailcfg{'delay'} seconds...\n" if $mailcfg{'debug'} > 1;
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sleep $mailcfg{'delay'};
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}
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if ( $connected ) {
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print "- connected to $server\n" if $mailcfg{'debug'} > 3;
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last;
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}
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else {
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$error .= "connect to $server failed\n";
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print "- connect to $server failed, next server...\n" if $mailcfg{'debug'} > 1;
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next; # next server
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}
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}
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unless ( $connected ) {
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return fail("connect to $smtp failed ($!) no (more) retries!")
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};
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{
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local $^W = 0; # don't warn on undefined variables
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# Add info to log variable
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$log .= "Server: $smtp Port: $port\n"
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. "From: $fromaddr\n"
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. "Subject: $mail{Subject}\n"
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;
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}
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my($oldfh) = select(S); $| = 1; select($oldfh);
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socket_read()
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|| return fail("Connection error from $smtp on port $port ($_)");
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socket_write("EHLO $localhost$CRLF")
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|| return fail("send EHLO error (lost connection?)");
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my $ehlo = socket_read();
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if ($ehlo) {
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# parse EHLO response
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map {
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s/^\d+[- ]//;
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my ($k, $v) = split /\s+/, $_, 2;
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$esmtp{$k} = $v || 1 if $k;
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} split(/\n/, $ehlo);
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}
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else {
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# try plain HELO instead
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socket_write("HELO $localhost$CRLF")
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|| return fail("send HELO error (lost connection?)");
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}
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if ($auth) {
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warn "AUTH requested\n" if ($mailcfg{debug} > 4);
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# reduce wanted methods to those supported
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my @methods = grep {$esmtp{'AUTH'}=~/(^|\s)$_(\s|$)/i}
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grep {$auth_support =~ /(^|\s)$_(\s|$)/i}
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grep /\S/, split(/\s+/, $auth->{method});
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if (@methods) {
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# try to authenticate
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if (exists $auth->{pass}) {
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$auth->{password} = $auth->{pass};
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}
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my $method = uc $methods[0];
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_require_base64() || fail("Could not use MIME::Base64 module required for authentication");
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||
|
if ($method eq "LOGIN") {
|
||
|
print STDERR "Trying AUTH LOGIN\n" if ($mailcfg{debug} > 9);
|
||
|
socket_write("AUTH LOGIN$CRLF")
|
||
|
|| return fail("send AUTH LOGIN failed (lost connection?)");
|
||
|
socket_read()
|
||
|
|| return fail("AUTH LOGIN failed: $server_reply");
|
||
|
socket_write(encode_base64($auth->{user},$CRLF))
|
||
|
|| return fail("send LOGIN username failed (lost connection?)");
|
||
|
socket_read()
|
||
|
|| return fail("LOGIN username failed: $server_reply");
|
||
|
socket_write(encode_base64($auth->{password},$CRLF))
|
||
|
|| return fail("send LOGIN password failed (lost connection?)");
|
||
|
socket_read()
|
||
|
|| return fail("LOGIN password failed: $server_reply");
|
||
|
}
|
||
|
elsif ($method eq "PLAIN") {
|
||
|
warn "Trying AUTH PLAIN\n" if ($mailcfg{debug} > 9);
|
||
|
socket_write(
|
||
|
"AUTH PLAIN "
|
||
|
. encode_base64(join("\0", $auth->{user}, $auth->{user}, $auth->{password}), $CRLF)
|
||
|
) || return fail("send AUTH PLAIN failed (lost connection?)");
|
||
|
socket_read()
|
||
|
|| return fail("AUTH PLAIN failed: $server_reply");
|
||
|
}
|
||
|
elsif ($method eq "CRAM-MD5") {
|
||
|
_require_md5() || fail("Could not use Digest::MD5 module required for authentication");
|
||
|
warn "Trying AUTH CRAM-MD5\n" if ($mailcfg{debug} > 9);
|
||
|
socket_write("AUTH CRAM-MD5$CRLF")
|
||
|
|| return fail("send CRAM-MD5 failed (lost connection?)");
|
||
|
my $challenge = socket_read()
|
||
|
|| return fail("AUTH CRAM-MD5 failed: $server_reply");
|
||
|
$challenge =~ s/^\d+\s+//;
|
||
|
my $response = _hmac_md5($auth->{password}, decode_base64($challenge));
|
||
|
socket_write(encode_base64("$auth->{user} $response", $CRLF))
|
||
|
|| return fail("AUTH CRAM-MD5 failed: $server_reply");
|
||
|
socket_read()
|
||
|
|| return fail("AUTH CRAM-MD5 failed: $server_reply");
|
||
|
}
|
||
|
elsif ($method eq "DIGEST-MD5") {
|
||
|
_require_md5() || fail("Could not use Digest::MD5 module required for authentication");
|
||
|
warn "Trying AUTH DIGEST-MD5\n" if ($mailcfg{debug} > 9);
|
||
|
socket_write("AUTH DIGEST-MD5$CRLF")
|
||
|
|| return fail("send CRAM-MD5 failed (lost connection?)");
|
||
|
my $challenge = socket_read()
|
||
|
|| return fail("AUTH DIGEST-MD5 failed: $server_reply");
|
||
|
$challenge =~ s/^\d+\s+//; $challenge =~ s/[\r\n]+$//;
|
||
|
warn "\nCHALLENGE=", decode_base64($challenge), "\n" if ($mailcfg{debug} > 10);
|
||
|
my $response = _digest_md5($auth->{user}, $auth->{password}, decode_base64($challenge), $auth->{realm});
|
||
|
warn "\nRESPONSE=$response\n" if ($mailcfg{debug} > 10);
|
||
|
socket_write(encode_base64($response, ""), $CRLF)
|
||
|
|| return fail("AUTH DIGEST-MD5 failed: $server_reply");
|
||
|
my $status = socket_read()
|
||
|
|| return fail("AUTH DIGEST-MD5 failed: $server_reply");
|
||
|
if ($status =~ /^3/) {
|
||
|
socket_write($CRLF)
|
||
|
|| return fail("AUTH DIGEST-MD5 failed: $server_reply");
|
||
|
socket_read()
|
||
|
|| return fail("AUTH DIGEST-MD5 failed: $server_reply");
|
||
|
}
|
||
|
}
|
||
|
else {
|
||
|
return fail("$method not supported (and wrongly advertised as supported by this silly module)\n");
|
||
|
}
|
||
|
$log .= "AUTH $method succeeded as user $auth->{user}\n";
|
||
|
}
|
||
|
else {
|
||
|
$esmtp{'AUTH'} =~ s/(^\s+|\s+$)//g; # cleanup for printig it below
|
||
|
if ($auth->{required}) {
|
||
|
return fail("Required AUTH method '$auth->{method}' not supported. "
|
||
|
."(Server supports '$esmtp{'AUTH'}'. Module supports: '$auth_support')");
|
||
|
}
|
||
|
else {
|
||
|
warn "No common authentication method! Requested: '$auth->{method}'. Server supports '$esmtp{'AUTH'}'. Module supports: '$auth_support'. Skipping authentication\n";
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
socket_write("MAIL FROM:<$fromaddr>$CRLF")
|
||
|
|| return fail("send MAIL FROM: error");
|
||
|
socket_read()
|
||
|
|| return fail("MAIL FROM: error ($_)");
|
||
|
|
||
|
my $to_ok = 0;
|
||
|
foreach $to (@recipients) {
|
||
|
socket_write("RCPT TO:<$to>$CRLF")
|
||
|
|| return fail("send RCPT TO: error");
|
||
|
if (socket_read()) {
|
||
|
$log .= "To: $to\n";
|
||
|
$to_ok++;
|
||
|
} else {
|
||
|
$log .= "FAILED To: $to ($server_reply)";
|
||
|
$error .= "Bad recipient <$to>: $server_reply\n";
|
||
|
}
|
||
|
}
|
||
|
unless ($to_ok) {
|
||
|
return fail("No valid recipient");
|
||
|
}
|
||
|
|
||
|
# start data part
|
||
|
|
||
|
socket_write("DATA$CRLF")
|
||
|
|| return fail("send DATA error");
|
||
|
socket_read()
|
||
|
|| return fail("DATA error ($_)");
|
||
|
|
||
|
# print headers
|
||
|
foreach $header (keys %mail) {
|
||
|
next if $header eq "Message";
|
||
|
$mail{$header} =~ s/\s+$//o; # kill possible trailing garbage
|
||
|
socket_write("$header: $mail{$header}$CRLF")
|
||
|
|| return fail("send $header: error");
|
||
|
};
|
||
|
|
||
|
#- test diconnecting from network here, to see what happens
|
||
|
#- print STDERR "DISCONNECT NOW!\n";
|
||
|
#- sleep 4;
|
||
|
#- print STDERR "trying to continue, expecting an error... \n";
|
||
|
|
||
|
# send message body (passed as a reference, in case it's big)
|
||
|
socket_write($CRLF, \$mail{'Message'}, "$CRLF.$CRLF")
|
||
|
|| return fail("send message error");
|
||
|
socket_read()
|
||
|
|| return fail("message transmission error ($_)");
|
||
|
$log .= "\nResult: $_";
|
||
|
|
||
|
# finish
|
||
|
socket_write("QUIT$CRLF")
|
||
|
|| return fail("send QUIT error");
|
||
|
socket_read();
|
||
|
close S;
|
||
|
|
||
|
return 1;
|
||
|
} # end sub sendmail
|
||
|
|
||
|
|
||
|
|
||
|
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
# Main code here
|
||
|
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
||
|
|
||
|
my $host = get_param("h");
|
||
|
my $destination = get_param("d");
|
||
|
my $from = get_param("f");
|
||
|
|
||
|
if (($host eq "") || ($destination eq "") || ($from eq "")){
|
||
|
print 'Pandora SMTP Remote plugin, (c) 2012 slerena@gmail.com';
|
||
|
print "\n\nThis plugin is used to send a mail to a SMTP server and check if works\n\nUsage:\n\n";
|
||
|
print " -h SMTP Server IP address\n";
|
||
|
print " -d Destination email\n";
|
||
|
print " -f Email of the sender\n";
|
||
|
|
||
|
print "\nOptional parameters \n\n";
|
||
|
print " -a Autentication system, could be LOGIN, PLAIN, CRAM-MD5 or DIGEST-MD\n";
|
||
|
print " -o SMTP Port (25 by default)\n";
|
||
|
print " -u user (only if MTA auth required)\n";
|
||
|
print " -p password (only if MTA auth required)\n";
|
||
|
print " -e debug - Show error (for testing in console only!)\n";
|
||
|
print "\n";
|
||
|
exit;
|
||
|
}
|
||
|
|
||
|
# Optional parameters
|
||
|
|
||
|
my $user = get_param("u");
|
||
|
my $pass = get_param("p");
|
||
|
my $port = get_param("o");
|
||
|
|
||
|
if ($port eq ""){
|
||
|
$port = 25;
|
||
|
}
|
||
|
|
||
|
my $show_error = get_param("e");
|
||
|
my $auth = get_param("a");
|
||
|
|
||
|
my $subject = "Pandora FMS SMTP Test";
|
||
|
my $message = "This is a check for SMTP done with Pandora FMS";
|
||
|
|
||
|
my %mail = ( To => $destination,
|
||
|
Message => $message,
|
||
|
Subject => $subject,
|
||
|
'X-Mailer' => "Pandora FMS",
|
||
|
Smtp => $host,
|
||
|
Port => $port,
|
||
|
From => $from,
|
||
|
);
|
||
|
|
||
|
if ($auth ne ""){
|
||
|
$mail{auth} = {user=>$user, password=>$pass, method=>$auth, required=>1 };
|
||
|
}
|
||
|
|
||
|
if (sendmail %mail) {
|
||
|
print "1\n";
|
||
|
} else {
|
||
|
print "0\n";
|
||
|
if ($show_error ne ""){
|
||
|
if (defined($Mail::Sendmail::error)){
|
||
|
print "ERROR Code: $Mail::Sendmail::error \n";
|
||
|
} else {
|
||
|
print "Undefined error ¿?\n";
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
exit;
|
||
|
|
||
|
|