537 lines
14 KiB
Perl
537 lines
14 KiB
Perl
package Qpsmtpd;
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use strict;
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use Carp;
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use Qpsmtpd::Connection;
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use Qpsmtpd::Transaction;
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use Qpsmtpd::Constants;
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use Qpsmtpd::Plugin;
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use Mail::Address ();
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use Mail::Header ();
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use Sys::Hostname;
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use IPC::Open2;
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use Data::Dumper;
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use POSIX qw(strftime);
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BEGIN{$^W=0;}
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use Net::DNS;
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BEGIN{$^W=1;}
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$Qpsmtpd::VERSION = "0.10";
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my $TRACE_LEVEL = 6;
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# $SIG{ALRM} = sub { respond(421, "Game over pal, game over. You got a timeout; I just can't wait that long..."); exit };
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sub new {
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my $proto = shift;
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my $class = ref($proto) || $proto;
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my %args = @_;
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my $self = bless ({ args => \%args }, $class);
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my (@commands) = qw(ehlo helo rset mail rcpt data help vrfy noop quit);
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my (%commands); @commands{@commands} = ('') x @commands;
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# this list of valid commands should probably be a method or a set of methods
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$self->{_commands} = \%commands;
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$self;
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}
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#
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# method to get the configuration. It just calls get_qmail_config by
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# default, but it could be overwritten to look configuration up in a
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# database or whatever.
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#
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sub config {
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my ($self, $c) = @_;
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my %defaults = (
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me => hostname,
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timeout => 1200,
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);
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if (wantarray) {
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my @config = $self->get_qmail_config($c);
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@config = @{$defaults{$c}} if (!@config and $defaults{$c});
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return @config;
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}
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else {
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return ($self->get_qmail_config($c) || $defaults{$c});
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}
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};
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sub log {
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my ($self, $trace, @log) = @_;
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warn join(" ", $$, @log), "\n"
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if $trace <= $TRACE_LEVEL;
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}
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sub dispatch {
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my $self = shift;
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my ($cmd) = lc shift;
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#$self->respond(553, $state{dnsbl_blocked}), return 1
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# if $state{dnsbl_blocked} and ($cmd eq "rcpt");
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$self->respond(500, "Unrecognized command"), return 1
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if ($cmd !~ /^(\w{1,12})$/ or !exists $self->{_commands}->{$1});
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$cmd = $1;
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if (1 or $self->{_commands}->{$cmd} and $self->can($cmd)) {
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my ($result) = eval { $self->$cmd(@_) };
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$self->log(0, "XX: $@") if $@;
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return $result if defined $result;
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return $self->fault("command '$cmd' failed unexpectedly");
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}
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return;
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}
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sub fault {
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my $self = shift;
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my ($msg) = shift || "program fault - command not performed";
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print STDERR "$0[$$]: $msg ($!)\n";
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return $self->respond(451, "Internal error - try again later - " . $msg);
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}
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sub start_conversation {
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my $self = shift;
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# this should maybe be called something else than "connect", see
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# lib/Qpsmtpd/TcpServer.pm for more confusion.
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my ($rc, $msg) = $self->run_hooks("connect");
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if ($rc != DONE) {
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$self->respond(220, $self->config('me') ." ESMTP qpsmtpd "
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. $self->version ." ready; send us your mail, but not your spam.");
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}
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}
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sub transaction {
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my $self = shift;
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use Data::Dumper;
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#warn Data::Dumper->Dump([\$self], [qw(self)]);
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return $self->{_transaction} || ($self->{_transaction} = Qpsmtpd::Transaction->new());
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}
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sub connection {
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my $self = shift;
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return $self->{_connection} || ($self->{_connection} = Qpsmtpd::Connection->new());
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}
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sub helo {
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my ($self, $hello_host, @stuff) = @_;
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my $conn = $self->connection;
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return $self->respond (503, "but you already said HELO ...") if $conn->hello;
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$conn->hello("helo");
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$conn->hello_host($hello_host);
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$self->transaction;
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$self->respond(250, $self->config('me') ." Hi " . $conn->remote_info . " [" . $conn->remote_ip ."]; I am so happy to meet you.");
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}
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sub ehlo {
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my ($self, $hello_host, @stuff) = @_;
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my $conn = $self->connection;
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return $self->respond (503, "but you already said HELO ...") if $conn->hello;
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$conn->hello("ehlo");
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$conn->hello_host($hello_host);
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$self->transaction;
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$self->respond(250,
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$self->config("me") . " Hi " . $conn->remote_info . " [" . $conn->remote_ip ."]",
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"PIPELINING",
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"8BITMIME",
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($self->config('databytes') ? "SIZE ". ($self->config('databytes'))[0] : ()),
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);
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}
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sub mail {
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my $self = shift;
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return $self->respond(501, "syntax error in parameters") if $_[0] !~ m/^from:/i;
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unless ($self->connection->hello) {
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return $self->respond(503, "please say hello first ...");
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}
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else {
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my $from_parameter = join " ", @_;
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$self->log(2, "full from_parameter: $from_parameter");
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my ($from) = ($from_parameter =~ m/^from:\s*(\S+)/i)[0];
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#warn "$$ from email address : $from\n" if $TRACE;
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if ($from eq "<>" or $from =~ m/\[undefined\]/) {
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$from = Mail::Address->new("<>");
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}
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else {
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$from = (Mail::Address->parse($from))[0];
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}
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return $self->respond(501, "could not parse your mail from command") unless $from;
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my ($rc, $msg) = $self->run_hooks("mail", $from);
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if ($rc == DONE) {
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return 1;
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}
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elsif ($rc == DENY) {
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$msg ||= $from->format . ', denied';
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$self->log(2, "deny mail from " . $from->format . " ($msg)");
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$self->respond(550, $msg);
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}
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elsif ($rc == DENYSOFT) {
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$msg ||= $from->format . ', temporarily denied';
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$self->log(2, "denysoft mail from " . $from->format . " ($msg)");
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$self->respond(450, $msg);
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}
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else { # includes OK
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$self->log(2, "getting mail from ".$from->format);
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$self->respond(250, $from->format . ", sender OK - how exciting to get mail from you!");
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$self->transaction->sender($from);
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}
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}
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}
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sub rcpt {
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my $self = shift;
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return $self->respond(501, "syntax error in parameters") unless $_[0] =~ m/^to:/i;
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return(503, "Use MAIL before RCPT") unless $self->transaction->sender;
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my ($rcpt) = ($_[0] =~ m/to:(.*)/i)[0];
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$rcpt = $_[1] unless $rcpt;
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$rcpt = (Mail::Address->parse($rcpt))[0];
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return $self->respond(501, "could not parse recipient") unless $rcpt;
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my ($rc, $msg) = $self->run_hooks("rcpt", $rcpt);
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if ($rc == DONE) {
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return 1;
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}
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elsif ($rc == DENY) {
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$msg ||= 'relaying denied';
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$self->respond(550, $msg);
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}
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elsif ($rc == DENYSOFT) {
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$msg ||= 'relaying denied';
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return $self->respond(550, $msg);
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}
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elsif ($rc == OK) {
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$self->respond(250, $rcpt->format . ", recipient ok");
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return $self->transaction->add_recipient($rcpt);
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}
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else {
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return $self->respond(450, "Could not determine of relaying is allowed");
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}
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return 0;
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}
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sub get_qmail_config {
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my ($self, $config) = (shift, shift);
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$self->log(6, "trying to get config for $config");
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if ($self->{_config_cache}->{$config}) {
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return wantarray ? @{$self->{_config_cache}->{$config}} : $self->{_config_cache}->{$config}->[0];
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}
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my $configdir = '/var/qmail/control';
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my ($name) = ($0 =~ m!(.*?)/([^/]+)$!);
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$configdir = "$name/config" if (-e "$name/config/$config");
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open CF, "<$configdir/$config" or warn "$$ could not open configfile $config: $!", return;
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my @config = <CF>;
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chomp @config;
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@config = grep { $_ and $_ !~ m/^\s*#/ and $_ =~ m/\S/} @config;
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close CF;
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$self->log(8, "returning get_config for $config ",Data::Dumper->Dump([\@config], [qw(config)]));
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$self->{_config_cache}->{$config} = \@config;
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return wantarray ? @config : $config[0];
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}
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sub help {
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my $self = shift;
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$self->respond(214,
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"This is qpsmtpd " . $self->version,
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"See http://develooper.com/code/qpsmtpd/",
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'To report bugs or send comments, mail to <ask@perl.org>.');
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}
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sub version {
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$Qpsmtpd::VERSION;
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}
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sub noop {
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my $self = shift;
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warn Data::Dumper->Dump([\$self], [qw(self)]);
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$self->respond(250, "OK");
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}
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sub vrfy {
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shift->respond(252, "Just try sending a mail and we'll see how it turns out ...");
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}
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sub rset {
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my $self = shift;
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$self->{_transaction} = undef;
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$self->transaction->start();
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$self->respond(250, "OK");
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}
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sub quit {
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my $self = shift;
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my ($rc, $msg) = $self->run_hooks("quit");
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if ($rc != DONE) {
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$self->respond(221, $self->config('me') . " closing connection. Have a wonderful day.");
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}
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$self->disconnect();
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}
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sub disconnect {
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my $self = shift;
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$self->run_hooks("disconnect");
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}
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sub data {
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my $self = shift;
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$self->respond(503, "MAIL first"), return 1 unless $self->transaction->sender;
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$self->respond(503, "RCPT first"), return 1 unless $self->transaction->recipients;
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$self->respond(354, "go ahead");
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my $buffer = '';
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my $size = 0;
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my $i = 0;
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my $max_size = ($self->config('databytes'))[0] || 0; # this should work in scalar context
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my $blocked = "";
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my %matches;
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my $in_header = 1;
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my $complete = 0;
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$self->log(6, "max_size: $max_size / size: $size");
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my $header = Mail::Header->new(Modify => 0, MailFrom => "COERCE");
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my $timeout = $self->config('timeout');
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while (<STDIN>) {
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$complete++, last if $_ eq ".\r\n";
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$i++;
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$self->respond(451, "See http://develooper.com/code/qpsmtpd/barelf.html"), exit
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if $_ eq ".\n";
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# add a transaction->blocked check back here when we have line by line plugin access...
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unless (($max_size and $size > $max_size)) {
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s/\r\n$/\n/;
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if ($in_header and m/^\s*$/) {
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$in_header = 0;
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my @header = split /\n/, $buffer;
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# ... need to check that we don't reformat any of the received lines.
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#
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# 3.8.2 Received Lines in Gatewaying
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# When forwarding a message into or out of the Internet environment, a
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# gateway MUST prepend a Received: line, but it MUST NOT alter in any
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# way a Received: line that is already in the header.
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$header->extract(\@header);
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$buffer = "";
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# FIXME - call plugins to work on just the header here; can
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# save us buffering the mail content.
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}
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if ($in_header) {
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$buffer .= $_;
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}
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else {
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$self->transaction->body_write($_);
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}
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$size += length $_;
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}
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#$self->log(5, "size is at $size\n") unless ($i % 300);
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alarm $timeout;
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}
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$self->log(6, "max_size: $max_size / size: $size");
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$self->transaction->header($header);
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$header->add("Received", "from ".$self->connection->remote_info
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." (HELO ".$self->connection->hello_host . ") (".$self->connection->remote_ip
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. ") by ".$self->config('me')." (qpsmtpd/".$self->version
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.") with SMTP; ". (strftime('%Y-%m-%d %TZ', gmtime)),
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0);
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# if we get here without seeing a terminator, the connection is
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# probably dead.
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$self->respond(451, "Incomplete DATA"), return 1 unless $complete;
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#$self->respond(550, $self->transaction->blocked),return 1 if ($self->transaction->blocked);
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$self->respond(552, "Message too big!"),return 1 if $max_size and $size > $max_size;
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my ($rc, $msg) = $self->run_hooks("data_post");
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if ($rc == DONE) {
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return 1;
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}
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elsif ($rc == DENY) {
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$self->respond(552, $msg || "Message denied");
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}
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elsif ($rc == DENYSOFT) {
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$self->respond(452, $msg || "Message denied temporarily");
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}
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else {
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return $self->queue($self->transaction);
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}
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}
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sub 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 fault("Could not create message pipe"), exit;
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pipe(ENVELOPE_READER, ENVELOPE_WRITER) or fault("Could not create envelope pipe"), exit;
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my $child = fork();
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not defined $child and fault(451, "Could not fork"), exit;
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if ($child) {
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# Parent
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my $oldfh = select(MESSAGE_WRITER); $| = 1;
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select(ENVELOPE_WRITER); $| = 1;
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select($oldfh);
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close MESSAGE_READER or fault("close msg reader fault"),exit;
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close ENVELOPE_READER or fault("close envelope reader fault"), exit;
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$transaction->header->add("X-SMTPD", "qpsmtpd/".$self->version.", http://develooper.com/code/qpsmtpd/");
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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 "$from\0", join("\0",@rcpt), "\0\0"
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or respond(451,"Could not print addresses to queue"),exit;
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close ENVELOPE_WRITER;
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waitpid($child, 0);
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my $exit_code = $? >> 8;
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$exit_code and respond(451, "Unable to queue message ($exit_code)"), exit;
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$self->respond(250, "Queued.");
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}
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elsif (defined $child) {
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# Child
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close MESSAGE_WRITER or die "could not close message writer in parent";
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close ENVELOPE_WRITER or die "could not close envelope writer in parent";
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open(STDIN, "<&MESSAGE_READER") or die "b1";
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open(STDOUT, "<&ENVELOPE_READER") or die "b2";
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unless (exec '/var/qmail/bin/qmail-queue') {
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die "should never be here!";
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}
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}
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}
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sub load_plugins {
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my $self = shift;
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my @plugins = $self->config('plugins');
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my ($name) = ($0 =~ m!(.*?)/([^/]+)$!);
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my $dir = "$name/plugins";
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$self->log(2, "loading plugins from $dir");
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for my $plugin (@plugins) {
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$self->log(3, "Loading $plugin");
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my $plugin_name = $plugin;
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# Escape everything into valid perl identifiers
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$plugin_name =~ s/([^A-Za-z0-9_\/])/sprintf("_%2x",unpack("C",$1))/eg;
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# second pass cares for slashes and words starting with a digit
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$plugin_name =~ s{
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(/+) # directory
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(\d?) # package's first character
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}[
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"::" . (length $2 ? sprintf("_%2x",unpack("C",$2)) : "")
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]egx;
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my $sub;
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open F, "$dir/$plugin" or die "could not open $dir/$plugin: $!";
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{
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local $/ = undef;
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$sub = <F>;
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}
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close F;
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my $package = "Qpsmtpd::Plugin::$plugin_name";
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my $line = "\n#line 1 $dir/$plugin\n";
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my $eval = join(
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"\n",
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"package $package;",
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'use Qpsmtpd::Constants;',
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"require Qpsmtpd::Plugin;",
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'use vars qw(@ISA);',
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'@ISA = qw(Qpsmtpd::Plugin);',
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"sub plugin_name { qq[$plugin_name] }",
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$line,
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$sub,
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"\n", # last line comment without newline?
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);
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#warn "eval: $eval";
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$eval =~ m/(.*)/s;
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$eval = $1;
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eval $eval;
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die "eval $@" if $@;
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my $plug = $package->new(qpsmtpd => $self);
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$plug->register($self);
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}
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}
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sub run_hooks {
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my ($self, $hook) = (shift, shift);
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if ($self->{_hooks}->{$hook}) {
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my @r;
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for my $code (@{$self->{_hooks}->{$hook}}) {
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eval { (@r) = &{$code}($self->transaction, @_); };
|
|
$@ and $self->log(0, "FATAL PLUGIN ERROR: ", $@) and next;
|
|
$self->log(1, "a $hook hook returned undef!") and next unless defined $r[0];
|
|
last unless $r[0] == DECLINED;
|
|
}
|
|
return @r;
|
|
}
|
|
warn "Did not run any hooks ...";
|
|
return (0, '');
|
|
}
|
|
|
|
sub _register_hook {
|
|
my $self = shift;
|
|
my ($hook, $code) = @_;
|
|
|
|
#my $plugin = shift; # see comment in Plugin.pm:register_hook
|
|
|
|
$self->{_hooks} ||= {};
|
|
my $hooks = $self->{_hooks};
|
|
push @{$hooks->{$hook}}, $code;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
1;
|