391 lines
8.8 KiB
Perl
391 lines
8.8 KiB
Perl
#!/usr/bin/perl -w
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=head1 NAME
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smtp-forward
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=head1 DESCRIPTION
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This plugin forwards the mail via SMTP to a specified server, rather than
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delivering the email locally.
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=head1 CONFIG
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It takes one required parameter, the IP address or hostname to forward to.
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async/queue/smtp-forward 10.2.2.2
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Optionally you can also add a port:
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async/queue/smtp-forward 10.2.2.2 9025
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=cut
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use Qpsmtpd::Constants;
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sub register {
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my ($self, $qp) = @_;
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$self->register_hook(queue => "start_queue");
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$self->register_hook(queue => "finish_queue");
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}
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sub init {
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my ($self, $qp, @args) = @_;
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if (@args > 0) {
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if ($args[0] =~ /^([\.\w_-]+)$/) {
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$self->{_smtp_server} = $1;
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}
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else {
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die "Bad data in smtp server: $args[0]";
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}
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$self->{_smtp_port} = 25;
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if (@args > 1 and $args[1] =~ /^(\d+)$/) {
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$self->{_smtp_port} = $1;
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}
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$self->log(LOGWARN, "WARNING: Ignoring additional arguments.") if (@args > 2);
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}
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else {
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die("No SMTP server specified in smtp-forward config");
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}
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}
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sub start_queue {
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my ($self, $transaction) = @_;
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my $qp = $self->qp;
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my $SERVER = $self->{_smtp_server};
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my $PORT = $self->{_smtp_port};
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$self->log(LOGINFO, "forwarding to $SERVER:$PORT");
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$transaction->notes('async_sender',
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AsyncSMTPSender->new($SERVER, $PORT, $qp, $self, $transaction)
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);
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return YIELD;
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}
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sub finish_queue {
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my ($self, $transaction) = @_;
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my $sender = $transaction->notes('async_sender');
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my ($rc, $msg) = $sender->results;
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return $rc, $msg;
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}
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package AsyncSMTPSender;
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use IO::Socket;
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use base qw(Danga::Socket);
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use fields qw(
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qp
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pkg
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tran
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state
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rcode
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rmsg
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buf
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command
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resp
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to
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);
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use constant ST_CONNECTING => 0;
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use constant ST_CONNECTED => 1;
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use constant ST_COMMANDS => 2;
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use constant ST_DATA => 3;
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use Qpsmtpd::Constants;
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sub new {
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my ($self, $server, $port, $qp, $pkg, $transaction) = @_;
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$self = fields::new($self) unless ref $self;
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my $sock = IO::Socket::INET->new(
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PeerAddr => $server,
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PeerPort => $port,
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Blocking => 0,
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) or die "Error connecting to server $server:$port : $!\n";
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IO::Handle::blocking($sock, 0);
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binmode($sock, ':raw');
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$self->{qp} = $qp;
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$self->{pkg} = $pkg;
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$self->{tran} = $transaction;
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$self->{state} = ST_CONNECTING;
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$self->{rcode} = DECLINED;
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$self->{command} = 'connect';
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$self->{buf} = '';
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$self->{resp} = [];
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# copy the recipients so we can pop them off one by one
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$self->{to} = [ $transaction->recipients ];
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$self->SUPER::new($sock);
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# Watch for write first, this is when the TCP session is established.
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$self->watch_write(1);
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return $self;
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}
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sub results {
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my AsyncSMTPSender $self = shift;
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return ( $self->{rcode}, $self->{rmsg} );
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}
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sub log {
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my AsyncSMTPSender $self = shift;
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$self->{qp}->log(@_);
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}
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sub cont {
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my AsyncSMTPSender $self = shift;
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$self->{qp}->run_continuation;
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}
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sub command {
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my AsyncSMTPSender $self = shift;
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my ($command, $params) = @_;
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$params ||= '';
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$self->log(LOGDEBUG, ">> $command $params");
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$self->write(($command =~ m/ / ? "$command:" : $command)
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. ($params ? " $params" : "") . "\r\n");
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$self->watch_read(1);
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$self->{command} = ($command =~ /(\S+)/)[0];
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}
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sub handle_response {
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my AsyncSMTPSender $self = shift;
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my $method = "cmd_" . lc($self->{command});
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$self->$method(@_);
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}
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sub cmd_connect {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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if ($code != 220) {
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$self->{rmsg} = "Error on connect: @$response";
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$self->close;
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$self->cont;
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}
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else {
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my $host = $self->{qp}->config('me');
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print "HELOing with $host\n";
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$self->command((join '', @$response) =~ m/ ESMTP/ ? "EHLO" : "HELO", $host);
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}
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}
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sub cmd_helo {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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if ($code != 250) {
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$self->{rmsg} = "Error on HELO: @$response";
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$self->close;
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$self->cont;
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}
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else {
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$self->command("MAIL", "FROM:" . $self->{tran}->sender->format);
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}
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}
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sub cmd_ehlo {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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if ($code != 250) {
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$self->{rmsg} = "Error on EHLO: @$response";
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$self->close;
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$self->cont;
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}
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else {
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$self->command("MAIL", "FROM:" . $self->{tran}->sender->format);
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}
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}
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sub cmd_mail {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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if ($code != 250) {
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$self->{rmsg} = "Error on MAIL FROM: @$response";
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$self->close;
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$self->cont;
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}
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else {
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$self->command("RCPT", "TO:" . shift(@{$self->{to}})->format);
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}
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}
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sub cmd_rcpt {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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if ($code != 250) {
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$self->{rmsg} = "Error on RCPT TO: @$response";
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$self->close;
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$self->cont;
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}
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else {
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if (@{$self->{to}}) {
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$self->command("RCPT", "TO:" . shift(@{$self->{to}})->format);
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}
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else {
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$self->command("DATA");
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}
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}
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}
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sub cmd_data {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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if ($code != 354) {
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$self->{rmsg} = "Error on DATA: @$response";
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$self->close;
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$self->cont;
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}
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else {
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# $self->{state} = ST_DATA;
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$self->datasend($self->{tran}->header->as_string);
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$self->{tran}->body_resetpos;
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while (my $line = $self->{tran}->body_getline) {
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$self->log(LOGDEBUG, ">> $line");
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$line =~ s/\r?\n/\r\n/;
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$self->datasend($line);
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}
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$self->write(".\r\n");
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$self->{command} = "DATAEND";
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}
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}
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sub cmd_dataend {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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if ($code != 250) {
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$self->{rmsg} = "Error after DATA: @$response";
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$self->close;
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$self->cont;
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}
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else {
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$self->command("QUIT");
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}
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}
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sub cmd_quit {
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my AsyncSMTPSender $self = shift;
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my ($code, $response) = @_;
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$self->{rcode} = OK;
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$self->{rmsg} = "Queued!";
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$self->close;
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$self->cont;
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}
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sub datasend {
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my AsyncSMTPSender $self = shift;
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my ($data) = @_;
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$data =~ s/^\./../mg;
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$self->write(\$data);
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}
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sub event_read {
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my AsyncSMTPSender $self = shift;
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if ($self->{state} == ST_CONNECTED) {
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$self->{state} = ST_COMMANDS;
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}
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if ($self->{state} == ST_COMMANDS) {
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my $in = $self->read(1024);
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if (!$in) {
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# XXX: connection closed
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$self->close("lost connection");
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return;
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}
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my @lines = split /\r?\n/, $self->{buf} . $$in, -1;
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$self->{buf} = delete $lines[-1];
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for(@lines) {
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if (my ($code, $cont, $rest) = /^([0-9]{3})([ -])(.*)/) {
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$self->log(LOGDEBUG, "<< $code$cont$rest");
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push @{$self->{resp}}, $rest;
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if($cont eq ' ') {
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$self->handle_response($code, $self->{resp});
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$self->{resp} = [];
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}
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}
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else {
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$self->log(LOGERROR, "Unrecognised SMTP response line: $_");
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$self->{rmsg} = "Error from upstream SMTP server";
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$self->close;
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$self->cont;
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}
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}
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}
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else {
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$self->log(LOGERROR, "SMTP Session occurred out of order");
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$self->close;
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$self->cont;
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}
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}
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sub event_write {
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my AsyncSMTPSender $self = shift;
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if ($self->{state} == ST_CONNECTING) {
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$self->watch_write(0);
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$self->{state} = ST_CONNECTED;
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$self->watch_read(1);
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}
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elsif (0 && $self->{state} == ST_DATA) {
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# send more data
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if (my $line = $self->{tran}->body_getline) {
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$self->log(LOGDEBUG, ">> $line");
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$line =~ s/\r?\n/\r\n/;
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$self->datasend($line);
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}
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else {
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# no more data.
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$self->log(LOGINFO, "No more data");
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$self->watch_write(0);
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$self->{state} = ST_COMMANDS;
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}
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}
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else {
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$self->write(undef);
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}
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}
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sub event_err {
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my ($self) = @_;
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eval { $self->read(1); }; # gives us the correct error in errno
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$self->{rmsg} = "Read error from remote server: $!";
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#print "lost connection: $!\n";
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$self->close;
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$self->cont;
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}
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sub event_hup {
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my ($self) = @_;
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eval { $self->read(1); }; # gives us the correct error in errno
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$self->{rmsg} = "HUP error from remote server: $!";
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#print "lost connection: $!\n";
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$self->close;
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$self->cont;
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}
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