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#!/usr/bin/perl -T
#----------------------------------------------------------------------
# Pull mails from an IMAP mailbox and deliver them to an SMTP session
# Copyright © 2016 Guilhem Moulin <guilhem@fripost.org>
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#----------------------------------------------------------------------
use strict;
use warnings;
our $VERSION = '0.3';
my $NAME = 'pullimap';
use Fcntl qw/O_CREAT O_RDWR O_DSYNC LOCK_EX SEEK_SET/;
use Getopt::Long qw/:config posix_default no_ignore_case gnu_getopt auto_version/;
use List::Util 'first';
use lib 'lib';
use Net::IMAP::InterIMAP 'read_config';
my %CONFIG;
sub usage(;$) {
my $rv = shift // 0;
if ($rv) {
print STDERR "Usage: $NAME [OPTIONS] SECTION\n"
."Try '$NAME --help' or consult the manpage for more information.\n";
}
else {
print STDERR "Usage: $NAME [OPTIONS] SECTION\n"
."Consult the manpage for more information.\n";
}
exit $rv;
}
usage(1) unless GetOptions(\%CONFIG, qw/config=s quiet|q debug help|h/);
usage(0) if $CONFIG{help};
usage(1) unless $#ARGV == 0 and $ARGV[0] ne '_';
#######################################################################
# Read and validate configuration
#
my $CONF = read_config( delete $CONFIG{config} // $NAME,
, [$ARGV[0]]
, statefile => qr/\A(\P{Control}+)\z/
, mailbox => qr/\A([\x01-\x7F]+)\z/
)->{$ARGV[0]};
my ($MAILBOX, $STATE, $LOGGER_FD);
do {
$MAILBOX = $CONF->{mailbox} // 'INBOX';
my $statefile = $CONF->{statefile} // $ARGV[0];
die "Missing option statefile" unless defined $statefile;
$statefile = $statefile =~ /\A(\p{Print}+)\z/ ? $1 : die "Insecure $statefile";
unless ($statefile =~ /\A\//) {
my $dir = ($ENV{XDG_DATA_HOME} // "$ENV{HOME}/.local/share") .'/'. $NAME;
$dir = $dir =~ /\A(\/\p{Print}+)\z/ ? $1 : die "Insecure $dir";
$statefile = $dir .'/'. $statefile;
unless (-d $dir) {
mkdir $dir, 0700 or die "Can't mkdir $dir: $!\n";
}
}
sysopen($STATE, $statefile, O_CREAT|O_RDWR|O_DSYNC, 0600) or die "Can't open $statefile: $!";
flock($STATE, LOCK_EX) or die "Can't flock $statefile: $!";
if (defined (my $logfile = $CONF->{logfile})) {
require 'POSIX.pm';
require 'Time/HiRes.pm';
open $LOGGER_FD, '>>', $logfile or die "Can't open $logfile: $!\n";
$LOGGER_FD->autoflush(1);
}
elsif ($CONFIG{debug}) {
$LOGGER_FD = \*STDERR;
}
};
#######################################################################
# Read a UID (32-bits integer) from the statefile, or undef if we're at
# the end of the statefile
sub readUID() {
my $n = sysread($STATE, my $buf, 4) // die "Can't sysread: $!";
return if $n == 0; # EOF
# file length is a multiple of 4 bytes, and we always read 4 bytes at a time
die "Corrupted state file!" if $n != 4;
unpack('N', $buf);
}
# Write a UID (32-bits integer) to the statefile
sub writeUID($) {
my $uid = pack('N', shift);
my $offset = 0;
for ( my $offset = 0
; $offset < 4
; $offset += syswrite($STATE, $uid, 4-$offset, $offset) // die "Can't syswrite: $!"
) {}
}
#######################################################################
# Initialize the cache from the statefile, then pull new messages from
# the remote mailbox
#
my $IMAP = Net::IMAP::InterIMAP::->new( %$CONF, %CONFIG{qw/quiet debug/}, 'logger-fd' => $LOGGER_FD );
do {
my $uidvalidity = readUID();
my $uidnext = readUID();
my @ignore;
$IMAP->set_cache($MAILBOX, UIDVALIDITY => $uidvalidity, UIDNEXT => $uidnext);
$IMAP->select($MAILBOX);
unless (defined $uidvalidity) {
($uidvalidity) = $IMAP->get_cache('UIDVALIDITY');
# we were at pos 0 before the write, at pos 4 afterwards
writeUID($uidvalidity);
die if defined $uidnext; # sanity check
}
if (!defined $uidnext) {
# we were at pos 4 before the write, at pos 8 afterwards
writeUID(1);
}
else {
while (defined (my $uid = readUID())) {
push @ignore, $uid;
}
}
my $attrs = join ' ', qw/ENVELOPE INTERNALDATE BODY.PEEK[]/;
my @uid;
# invariant: we're at pos 8 + 4*(1+$#ignore + 1+$#uids)
$IMAP->pull_new_messages($attrs, sub($) {
my $mail = shift;
return unless exists $mail->{RFC822}; # not for us
my $uid = $mail->{UID};
my $from = first { defined $_ and @$_ } @{$mail->{ENVELOPE}}[2,3,4];
$from = (defined $from and @$from) ? $from->[0]->[2].'@'.$from->[0]->[3] : '';
print STDERR "($MAILBOX): UID $uid from <$from> ($mail->{INTERNALDATE})\n" unless $CONFIG{quiet};
# TODO sendmail
push @uid, $uid;
writeUID($uid);
}, @ignore);
# TODO mark (@ignore, @uid) as seen
# update the statefile
sysseek($STATE, 4, SEEK_SET) // die "Can't seek: $!";
($uidnext) = $IMAP->get_cache('UIDNEXT');
writeUID($uidnext);
truncate($STATE, 8) // die "Can't truncate";
};
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