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package Echolot::Mailin;
# (c) 2002 Peter Palfrader <peter@palfrader.org>
# $Id: Mailin.pm,v 1.8 2002/08/12 03:17:17 weasel Exp $
#
=pod
=head1 Name
Echolot::Mailin - Incoming Mail Dispatcher for Echolot
=head1 DESCRIPTION
=cut
use strict;
use Carp qw{cluck};
use English;
use Echolot::Globals;
use Fcntl ':flock'; # import LOCK_* constants
#use Fcntl ':seek'; # import SEEK_* constants
use POSIX; # import SEEK_* constants (older perls don't have SEEK_ in Fcntl)
sub make_sane_name() {
my $result = time().'.'.$PROCESS_ID.'_'.Echolot::Globals::get()->{'internal_counter'}++.'.'.Echolot::Globals::get()->{'hostname'};
return $result;
};
sub sane_move($$) {
my ($from, $to) = @_;
my $link_success = link($from, $to);
$link_success or
cluck("Cannot link $from to $to: $!"),
return 0;
#- Trying move"),
#rename($from, $to) or
# cluck("Renaming $from to $to didn't work either: $!"),
# return 0;
$link_success && (unlink($from) or
cluck("Cannot unlink $from: $!") );
return 1;
};
sub handle($) {
my ($lines) = @_;
my $i=0;
my $body = '';
my $to;
for ( ; $i < scalar @$lines; $i++) {
my $line = $lines->[$i];
chomp($line);
last if $line eq '';
if ($line =~ m/^To:\s*(.*?)\s*$/) {
$to = $1;
};
};
for ( ; $i < scalar @$lines; $i++) {
$body .= $lines->[$i];
};
(defined $to) or
cluck("No To header found in mail"),
return 0;
my $address_result = Echolot::Tools::verify_address_tokens($to) or
cluck("Verifying '$to' failed"),
return 0;
my $type = $address_result->{'token'};
my $timestamp = $address_result->{'timestamp'};
Echolot::Conf::remailer_conf($body, $type, $timestamp), return 1 if ($type =~ /^conf\./);
Echolot::Conf::remailer_key($body, $type, $timestamp), return 1 if ($type =~ /^key\./);
Echolot::Conf::remailer_help($body, $type, $timestamp), return 1 if ($type =~ /^help\./);
Echolot::Conf::remailer_stats($body, $type, $timestamp), return 1 if ($type =~ /^stats\./);
Echolot::Conf::remailer_adminkey($body, $type, $timestamp), return 1 if ($type =~ /^adminkey\./);
Echolot::Pinger::receive($body, $type, $timestamp), return 1 if ($type eq 'ping');
cluck("Didn't know what to do with '$to'"),
return 0;
};
sub handle_file($) {
my ($file) = @_;
open (FH, $file) or
cluck("Cannot open file $file: $!"),
return 0;
my @lines = <FH>;
my $body = join('', <FH>);
close (FH) or
cluck("Cannot close file $file: $!");
return handle(\@lines);
};
sub read_mbox($) {
my ($file) = @_;
my @mail;
my $mail = [];
my $blank = 1;
open(FH, '+<', $file) or
cluck("cannot open '$file': $!\n"),
return undef;
flock(FH, LOCK_EX) or
cluck("cannot gain lock on '$file': $!\n"),
return undef;
while(<FH>) {
if($blank && /\AFrom .*\d{4}/) {
push(@mail, $mail) if scalar(@{$mail});
$mail = [ $_ ];
$blank = 0;
} else {
$blank = m#\A\Z# ? 1 : 0;
push @$mail, $_;
}
}
push(@mail, $mail) if scalar(@{$mail});
seek(FH, 0, SEEK_SET) or
cluck("cannot seek to start of '$file': $!\n"),
return undef;
truncate(FH, 0) or
cluck("cannot truncate '$file' to zero size: $!\n"),
return undef;
flock(FH, LOCK_UN) or
cluck("cannot release lock on '$file': $!\n"),
return undef;
close(FH);
return \@mail;
}
sub read_maildir($) {
my ($dir) = @_;
my @mail;
my @files;
for my $sub (qw{new cur}) {
opendir(DIR, $dir.'/'.$sub) or
cluck("Cannot open direcotry '$dir/$sub': $!"),
return 0;
push @files, map { $sub.'/'.$_ } grep { ! /^\./ } readdir(DIR);
closedir(DIR) or
cluck("Cannot close direcotry '$dir/$sub': $!");
};
for my $file (@files) {
$file =~ /^(.*)$/s or
confess("I really should match here. ('$file').");
$file = $1;
my $mail = [];
open(FH, $dir.'/'.$file) or
cluck("cannot open '$dir/$file': $!\n"),
return undef;
@$mail = <FH>;
close(FH);
push @mail, $mail;
};
for my $file (@files) {
unlink $dir.'/'.$file or
cluck("cannot unlink '$dir/$file': $!\n");
};
return \@mail;
}
sub storemail($$) {
my ($path, $mail) = @_;
my $tmpname = $path.'/tmp/'.make_sane_name();
open (F, '>'.$tmpname) or
cluck("Cannot open $tmpname: $!"),
return undef;
print F join ('', @$mail);
close F;
my $i;
for ($i = 0; $i < 5; $i++ ) {
my $targetname = $path.'/cur/'.make_sane_name();
sane_move($tmpname, $targetname) or
sleep 1, next;
last;
};
return undef if ($i == 5);
return 1;
};
sub process() {
my $inmail = Echolot::Config::get()->{'mailin'};
my $mailerrordir = Echolot::Config::get()->{'mailerrordir'};
my $mails = (-d $inmail) ?
read_maildir($inmail) :
( ( -e $inmail ) ? read_mbox($inmail) : [] );
Echolot::Globals::get()->{'storage'}->delay_commit();
for my $mail (@$mails) {
unless (handle($mail)) {
my $name = make_sane_name();
storemail($mailerrordir, $mail) or
cluck("Could not store a mail");
};
};
Echolot::Globals::get()->{'storage'}->enable_commit();
};
1;
# vim: set ts=4 shiftwidth=4:
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