#!/usr/bin/env perl
#
#  Script to populate a Qmail ~alias directory with entries from
#  an [SZ]mail{er} or sendmail-like aliases file
#
# $FreeBSD: head/mail/qmail/files/mkaliasdir 351447 2014-04-17 05:16:47Z bdrewery $
#
#  Dan Cross <tenser@spitfire.ecsel.psu.edu>
#

require 'getopts.pl';

$ALIASES = "/etc/aliases";

die "$0 must be run as root!\n" if ($< != 0);

do Getopts('vf:');

$verbose = 0 unless ($verbose = $opt_v);
$aliases = $ALIASES unless ($aliases = $opt_f);

if (($aliasdir = (getpwnam("alias"))[7]) eq "")
{
	die "User alias does not exist, bailing!\n";
}

if (($qmaildir = (getpwnam("qmaild"))[7]) eq "")
{
	die "User qmaild does not exist, bailing!\n";
}

$ME = "$qmaildir/control/me";

die "Error opening $ME: $!\n" unless open(ME, "$ME");
chop($me = <ME>);
close (ME);

die "Error opening $aliases: $!\n" unless open(ALIASES, "$aliases");

while (<ALIASES>)
{
	chop;

	$mode = ">";

	s/#.*$//;

	($target, $data) = split(/:/, $_, 2);

	$data =~ s/^\s+//;
	$data =~ s/\s+$//;

	next if (/^$/);

	if ($data =~ /^$/)
	{
		while (chop($data = <ALIASES>))
		{
			$data =~ s/^\s+//;
			$data =~ s/\s+$//;

			last if ($data !~ /^$/);
		}
	}

	$f = "$aliasdir/.qmail-$target";

	@data = split(/\,/, $data);
	$datum = $data[0];

	if ($datum =~ /^:include:/i)
	{
		$datum =~ s/^:include://i;
		$verbose && print "Symlinking $f to $datum...\n";
		symlink($datum, $f);
		shift(@data);
		$f = $datum;
		$mode = ">>";
	}

	open(ALIAS, "$mode$f") || die "Error creating $f: $!\n";

	$verbose && print "Creating $f...\n";

	foreach $datum (@data)
	{
		$datum =~ s/"$// if ($datum =~ s/^"// ||
					$datum =~ s/^\|[ \t]*"/|/);

		if ($datum =~ /^[|\/]/)
		{
			print ALIAS $datum, "\n";
		}
		else
		{
			$datum = "&" . $datum;
			$datum .= "\@$me" unless ($datum =~ /\@/);
			print ALIAS "$datum\n";
		}

		$verbose && print "\tPopulating $f with $datum...\n";
	}

	close(ALIAS);
}

close(ALIASES);

exit 0;