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#!/usr/bin/perl
# $Id: msg2smtp.pl,v 1.8 2007/07/29 16:30:25 polak Exp $
my $usage = qq!
$0 takes a mail message on STDIN and relays it to an SMTP server.
$0 -h HOST [options]
-h HOST (hostname of SMTP server, often 'localhost')
Options:
-p PORT (port of the SMTP server)
-e HELO_DOMAIN (domain we use when to say helo to smtp server)
-U USERNAME (ESMTP auth username)
-P PASSWORD (ESMTP auth password)
-m MECHANISM (ESMTP auth mechanism - default is PLAIN)
-d (shows SMTP conversation and perl debugging)
!;
#------------------------------------------
# INDEX
# 0. GPL License
# 1. Module Dependencies
# 2. Set options by Command-line Arguments
# 3. Read Message by STDIN
# 4. Extend Net::SMTP to allow us to choose an auth mechanism
# 5. Send message via SMTP
#------------------------------------------
# 0. GPL License
#
# This file is part of GNU Anubis.
# Copyright (C) 2001, 2002, 2003 The Anubis Team.
#
# GNU Anubis is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# GNU Anubis is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Anubis; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# msg2smtp.pl code: Michael de Beer <michael@debeer.org>
# ext_auth() mainly taken from the Net::SMTP module
#
# http://www.gnu.org/software/anubis/
#
#------------------------------------------
# 1. Module Dependencies
use warnings; use strict;
use Getopt::Std;
use vars qw!$opt_h $opt_p $opt_e $opt_U $opt_P $opt_d $opt_m!;
# REQUIRED MODULES:
use Mail::Address;
use Net::SMTP;
# perl -MCPAN -e 'install Mail::Address'
# perl -MCPAN -e 'install Net::SMTP'
# OPTIONAL MODULES: Authen:SASL (for ESMTP auth)
# perl -MCPAN -e 'install Authen::SASL'
# Note: this script originally used functions from Mail::Box to:
# * parse messages and
# * interface with Net::SMTP
# However, I discovered Mail::Box did not support these options:
# 'port username password'
# So, I am not using Mail::Box.
# # use Mail::Box; use Mail::Transport::SMTP;
#------------------------------------------
# 2. Set options by Command-line Arguments
getopts('dh:p:e:U:P:m:');
my (%smtp_options, $host, $username, $password, $auth_mech);
if ($opt_h) {
$host = $opt_h;
} else {
print $usage, "\n";
exit(255);
}
$smtp_options{Port} = $opt_p if ($opt_p);
$smtp_options{Hello} = $opt_e if ($opt_e);
$smtp_options{Debug} = 1 if ($opt_d);
$username = $opt_U if ($opt_U);
$password = $opt_P if ($opt_P);
$auth_mech = $opt_m ? $opt_m : 'PLAIN'; # not tested other AUTH mechanisms
#------------------------------------------
# 3. Read Message by STDIN
# read the message and parse the headers for RCPT and FROM
my ($from, @rcpt);
my ($txt_head) = '';
my ($txt_body) = '';
# the only trick thing are To: lines that are folded
# I deal with that with 4 Rules, below.
my ($tmp, $readyflag, $chunk, @to_addresses);
$readyflag = 0;
HEAD: while ($tmp = <STDIN>) {
# Rule 1: If the line is a blank line, exit HEAD section
if ($tmp =~ /^$/) {
if ($readyflag eq 1) {
last;
}
else {
next HEAD;
}
}
# Rule 2: If it is a folded line, add line to $chunk, skip to next line
if ($tmp =~ /^\s+\S+/) { $chunk .= $tmp; next HEAD };
# Rule 3: If it is not a folded line, process old chunk
$_ = $chunk ? $chunk : '';
if (/^From:/i) {
s/^From://i;
my @from_addresses;
@from_addresses = Mail::Address->parse($_);
$from = pop(@from_addresses)->address;
die "From: address invalid" unless $from;
die "there is more than one From: address" if @from_addresses;
$readyflag = 1;
} elsif (/^(To|CC|BCC):/i) {
s/^(To|CC|BCC)://i;
@to_addresses = (); # re-initialize because we re-enter this loop
@to_addresses = Mail::Address->parse($_);
foreach my $obj (@to_addresses) {
push @rcpt, $obj->address;
}
}
$txt_head .= $chunk if ($chunk);
# Rule 4: start a new chunk
$chunk = $tmp;
}
while (<STDIN>) {
$txt_body .= $_;
}
#if ($smtp_options{Debug}) {
# print "\n---BEGINNING OF DEBUG---\n";
# print "From: $from\n"; map {print "To: $_\n"} @rcpt;
# print "MsgBody:\n$txt_body\n";
# print "---END OF DEBUG---\n";
#}
#------------------------------------------
# 4. Extend Net::SMTP to allow us to choose and auth mechanism
# We make an extend-auth method, as Net::SMTP::auth()
# does not seem to accurately pick a mechanism
package Net::SMTP;
sub ext_auth { # taken from Net::SMTP, only modify $mechanisms
my ($self, $username, $password, $mechanisms) = @_;
require MIME::Base64;
require Authen::SASL;
my $m = $self->supports('AUTH',500,["Command unknown: 'AUTH'"]);
return unless defined $m;
my $sasl;
if (ref($username) and UNIVERSAL::isa($username,'Authen::SASL')) {
$sasl = $username;
$sasl->mechanism($mechanisms);
}
else {
die "auth(username, password)" if not length $username;
$sasl = Authen::SASL->new(mechanism=> $mechanisms,
callback => { user => $username,
pass => $password,
authname => $username,
});
}
my $client = $sasl->client_new('smtp',${*$self}{'net_smtp_host'},0);
my $str = $client->client_start;
# We dont support sasl mechanisms that encrypt the socket traffic.
# todo that we would really need to change the ISA hierarchy
# so we dont inherit from IO::Socket, but instead hold it in an attribute
my @cmd = ("AUTH", $client->mechanism, MIME::Base64::encode_base64($str,''));
my $code;
while (($code = $self->command(@cmd)->response()) == CMD_MORE) {
@cmd = (MIME::Base64::encode_base64(
$client->client_step(
MIME::Base64::decode_base64(
($self->message)[0]
)
), ''
));
}
$code == CMD_OK;
}
#------------------------------------------
# 5. Send message via SMTP
package main;
my $smtp = Net::SMTP->new($host, %smtp_options);
$smtp or die "failed to connect to SMTP server";
if ($username) {
print "WARNING: failed ESMTP auth using username '$username'...trying to send anyway\n" unless $smtp->ext_auth ($username, $password, $auth_mech);
};
$smtp->mail($from) or die "server rejected FROM address '$from'";
$smtp->to(@rcpt, {SkipBad => 1}) or die "server rejected all TO addresses";
$smtp->data() or die "server crashed while preparing to send DATA";
$smtp->datasend($txt_head) or die "server crashed while sending DATA.1";
$smtp->datasend("\n") or die "server crashed while sending DATA.2";
$smtp->datasend($txt_body) or die "server crashed while sending DATA.3";
$smtp->dataend() or die "server crashed while ending DATA";
$smtp->quit or die "server crashed while quiting - message may not be lost";;
__END__
# EOF