131 lines
3.7 KiB
Perl
131 lines
3.7 KiB
Perl
#!perl -w
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=head1 NAME
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qmail-queue
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=head1 DESCRIPTION
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This is the most common plugin used to queue incoming mails. A
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variation of this plugin would maybe forward the mail via smtp.
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=head1 CONFIG
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It takes one optional parameter, the location of qmail-queue. This
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makes it easy to use a qmail-queue replacement.
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queue/qmail-queue /var/qmail/bin/another-qmail-queue
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If set the environment variable QMAILQUEUE overrides this setting.
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=cut
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use strict;
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use warnings;
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use Qpsmtpd::Constants;
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use POSIX ();
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sub register {
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my ($self, $qp, @args) = @_;
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if (@args > 0) {
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$self->{_queue_exec} = $args[0];
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$self->log(LOGWARN, "WARNING: Ignoring additional arguments.")
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if @args > 1;
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}
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$self->{_queue_exec} ||= ($ENV{QMAIL} || '/var/qmail') . "/bin/qmail-queue";
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$self->{_queue_exec} = $ENV{QMAILQUEUE} if $ENV{QMAILQUEUE};
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}
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sub hook_queue {
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my ($self, $transaction) = @_;
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# these bits inspired by Peter Samuels "qmail-queue wrapper"
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pipe(MESSAGE_READER, MESSAGE_WRITER) or die "Could not create message pipe";
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pipe(ENVELOPE_READER, ENVELOPE_WRITER)
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or die "Could not create envelope pipe";
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local $SIG{PIPE} = sub { die 'SIGPIPE' };
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my $child = fork();
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!defined $child and die "Could not fork";
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if ($child) {
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# Parent
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my $oldfh = select MESSAGE_WRITER;
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$| = 1;
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select ENVELOPE_WRITER;
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$| = 1;
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select $oldfh;
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close MESSAGE_READER or die "close msg reader fault";
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close ENVELOPE_READER or die "close envelope reader fault";
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$transaction->header->print(\*MESSAGE_WRITER);
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$transaction->body_resetpos;
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while (my $line = $transaction->body_getline) {
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print MESSAGE_WRITER $line;
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}
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close MESSAGE_WRITER;
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my @rcpt = map { "T" . $_->address } $transaction->recipients;
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my $from = "F" . ($transaction->sender->address || "");
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print ENVELOPE_WRITER "$from\0", join("\0", @rcpt), "\0\0"
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or return DECLINED, "Could not print addresses to queue";
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close ENVELOPE_WRITER;
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waitpid($child, 0);
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my $exit_code = $? >> 8;
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$exit_code
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and return DECLINED, "Unable to queue message ($exit_code)";
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my $msg_id = $transaction->header->get('Message-Id') || '';
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$msg_id =~ s/[\r\n].*//s; # don't allow newlines in the Message-Id here
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$msg_id = "<$msg_id>" unless $msg_id =~ /^<.*>$/; # surround in <>'s
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return OK, "Queued! " . time . " qp $child $msg_id";
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}
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elsif (defined $child) {
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# Child
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close MESSAGE_WRITER or exit 1;
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close ENVELOPE_WRITER or exit 2;
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# Untaint $self->{_queue_exec}
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my $queue_exec = $self->{_queue_exec};
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if ($queue_exec =~ /^(\/[\/\-\_\.a-z0-9A-Z]*)$/) {
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$queue_exec = $1;
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}
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else {
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$self->log(LOGERROR,
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"FATAL ERROR: Unexpected characters in qmail-queue plugin argument"
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);
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# This exit is ok as we're exiting a forked child process.
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exit 3;
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}
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# save the original STDIN and STDOUT in case exec() fails below
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open(SAVE_STDIN, "<&STDIN");
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open(SAVE_STDOUT, ">&STDOUT");
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POSIX::dup2(fileno(MESSAGE_READER), 0)
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or die "Unable to dup MESSAGE_READER: $!";
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POSIX::dup2(fileno(ENVELOPE_READER), 1)
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or die "Unable to dup ENVELOPE_READER: $!";
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my $ppid = getppid();
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$self->log(LOGNOTICE, "(for $ppid) Queuing to $queue_exec");
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my $rc = exec $queue_exec;
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# close the pipe
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close(MESSAGE_READER);
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close(MESSAGE_WRITER);
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exit 6; # we'll only get here if the exec fails
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}
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}
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