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#!/usr/bin/perl -w

# Copyright (c) 1999-2004, 2007 Gregory Neil Shapiro.  All Rights Reserved.
# 
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# $Id: buildvirtuser,v 1.8 2007-10-08 18:44:15 gshapiro Exp $

=head1 NAME

buildvirtuser - Build virtusertable support from a directory of files

=head1 SYNOPSIS

    buildvirtuser [-f] [-t]

=head1 DESCRIPTION

buildvirtuser will build /etc/mail/virtusertable.db and /etc/mail/virthosts
based on the contents of the directory /etc/mail/virtusers/.  That
directory should contain one file per virtual domain with the filename
matching the virtual domain name and the contents containing a list of
usernames on the left and the actual address for that username on the
right.  An empty left column translates to the default for that domain.
Blank lines and lines beginning with '#' are ignored.  Occurrences of
$DOMAIN in the file are replaced by the current domain being processed.
Occurrences of $LHS in the right hand side are replaced by the address on
the left hand side.

The -f option forces the database to be rebuilt regardless of whether
any file changes were detected.

The -t option instructs the program to build a text file instead of a
database.  The text file can then be used with makemap.

=head1 CONFIGURATION

In order to function properly, sendmail must be configured to use these
files with:

	FEATURE(`virtusertable')dnl
	VIRTUSER_DOMAIN_FILE(`/etc/mail/virthosts')dnl

If a new domain is added (i.e., by adding a new file to
/etc/mail/virtusers/), the sendmail daemon must be restarted for the change
to take affect.

=head1 EXAMPLES

Here is an example file from the /etc/mail/virtusers/ directory:

=head2 /etc/mail/virtusers/example.org:

 # Services
 MAILER-DAEMON	gshapiro+bounce.$DOMAIN@example.net
 postmaster	gshapiro+$LHS.$DOMAIN@example.net
 webmaster	gshapiro+$LHS.$DOMAIN@example.net
 
 # Defaults
 		error:nouser No such user
 
 # Users
 gshapiro	gshapiro+$DOMAIN@example.net
 zoe		zoe@example.com

=head1 AUTHOR

Gregory Neil Shapiro E<lt>F<gshapiro@gshapiro.net>E<gt>

=cut

use strict;
use File::stat;
use Getopt::Std;

my $makemap = "/usr/sbin/makemap";
my $dbtype = "hash";
my $maildir = "/etc/mail";
my $virthosts = "$maildir/virthosts";
my $newvirthosts = "$maildir/virthosts.new";
my $virts = "$maildir/virtusers";
my $newvirt = "$maildir/virtusertable.new.db";
my $virt = "$maildir/virtusertable.db";
my %virt = ();
my $newest = 0;
my ($lhs, $domain, $key, $value);
my $opts = {};

sub preserve_perms ($$)
{
	my $old = shift;
	my $new = shift;
	my $st;

	$st = stat($old);
	return if (!defined($st));
	chmod($st->mode, $new) || warn "Could not chmod($st->mode, $new): $!\n";
	chown($st->uid, $st->gid, $new) || warn "Could not chmod($st->uid, $st->gid, $new): $!\n";
}

getopts('ft', $opts) || die "Usage: $0 [-f] [-t]\n";

if ($opts->{t})
{
	$newvirt = "$maildir/virtusertable.new";
	$virt = "$maildir/virtusertable";
}

opendir(VIRTS, $virts) || die "Could not open directory $virts: $!\n";
my @virts = grep { -f "$virts/$_" } readdir(VIRTS);
closedir(VIRTS) || die "Could not close directory $virts: $!\n";

foreach $domain (@virts)
{
	next if ($domain =~ m/^\./);
	open(DOMAIN, "$virts/$domain") || die "Could not open file $virts/$domain: $!\n";
	my $line = 0;
	my $mtime = 0;
	my $st = stat("$virts/$domain");
	$mtime = $st->mtime if (defined($st));
	if ($mtime > $newest)
	{
		$newest = $mtime;
	}
LINE:	while (<DOMAIN>)
	{
		chomp;
		$line++;
		next LINE if /^#/;
		next LINE if /^$/;
		if (m/^([^\t ]*)[\t ]+(.*)$/)
		{
			if (defined($1))
			{
				$lhs = "$1";
				$key = "$1\@$domain";
			}
			else
			{
				$lhs = "";
				$key = "\@$domain";
			}
			$value = $2;
		}
		else
		{
			warn "Bogus line $line in $virts/$domain\n";
		}

		# Variable substitution
		$key =~ s/\$DOMAIN/$domain/g;
		$value =~ s/\$DOMAIN/$domain/g;
		$value =~ s/\$LHS/$lhs/g;
		$virt{$key} = $value;
	}
	close(DOMAIN) || die "Could not close $virts/$domain: $!\n";
}

my $virtmtime = 0;
my $st = stat($virt);
$virtmtime = $st->mtime if (defined($st));
if ($opts->{f} || $virtmtime < $newest)
{
	print STDOUT "Rebuilding $virt\n";
# logger -s -t ${prog} -p mail.info "Rebuilding ${basedir}/virtusertable"
	if ($opts->{t})
	{
		open(MAKEMAP, ">$newvirt") || die "Could not open $newvirt: $!\n";
	}
	else
	{
		open(MAKEMAP, "|$makemap $dbtype $newvirt") || die "Could not start makemap: $!\n";
	}

	foreach $key (keys %virt)
	{
		print MAKEMAP "$key\t\t$virt{$key}\n";
	}
	close(MAKEMAP) || die "Could not close makemap ($?): $!\n";
	preserve_perms($virt, $newvirt);
	rename($newvirt, $virt) || die "Could not rename $newvirt to $virt: $!\n";

	open(VIRTHOST, ">$newvirthosts") || die "Could not open file $newvirthosts: $!\n";
	foreach $domain (sort @virts)
	{
		next if ($domain =~ m/^\./);
		print VIRTHOST "$domain\n";
	}
	close(VIRTHOST) || die "Could not close $newvirthosts: $!\n";
	preserve_perms($virthosts, $newvirthosts);
	rename($newvirthosts, $virthosts) || die "Could not rename $newvirthosts to $virthosts: $!\n";
}
exit 0;