#! /bin/bash
#
#
# Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
# distribution information.
#
# Script to create the alias database
# (usually ${sysconfdir}/aliases.dat)
#
# The alias database text is usually
# ${sysconfdir}/aliases
#
# This can be either a file, or a directory.  If it's a directory, all files
# in the directory are concatenated together, and the database is created
# as the result.
#
# Use -alias=foo to use "foo" instead of
# ${sysconfdir}/aliases.dat
#
# Use -src=bar to use "bar" instead of
# ${sysconfdir}/aliases
#
# Use -dump to print the raw database, without creating anything.
#
# A temporary file is used, usually
# /usr/var/tmp/aliases.tmp.
# It must be on the same filesystem as aliases.dat.  If -alias is used to
# point to another filesystem, specify -tmp=filename.
# Since /usr/var/tmp is not globally writeable,
# -tmp must be used if a non-root runs makealiases (with other options,
# for testing purposes, perhaps).
#
# Use -chk AFTER aliases.dat has been created, with the same arguments,
# to check if the aliases include any bad addresses.

umask 002

prefix="/usr"
exec_prefix="/usr"
sysconfdir="/etc"
libexecdir="${exec_prefix}/libexec"
localstatedir="/usr/var"

aliassrc=""
aliastmp=""
aliasdump=""
aliasalias=""
module=""
protocol=""
xaliasdir=""
xaliastmpdir=""
aliasdir="aliasdir"

usage() {
	echo "Usage: $0 [ options ] module" >&2
	exit 1
}

while test $# -gt 0
do
	case $1 in
	-src=*)
		aliassrc="$1"
		shift
		;;
	-tmp=*)
		aliastmp="$1"
		shift
		;;
	-dump)
		aliasdump="$1"
		shift
		;;
	-alias=*)
		aliasalias="$1"
		shift
		;;
	-xaliasdir=*)
		aliasdir="$1"
		shift
		;;
	-xaliastmpdir=*)
		xaliastmpdir="$1"
		shift
		;;
	-protocol=*)
		protocol="$1"
		shift
		;;
	-chk)
		dochk=1
		shift
		;;
	-*)
		usage
		;;
	*)
		module="$1"
		break
		;;
	esac
done

xaliaspfix="-xaliaspfix=.xalias/"

if test "$protocol" != ""
then
	protocol="`echo $protocol | sed 's/^..........//'`"

	if test ! -d "${libexecdir}/courier/modules/$protocol"
	then
		echo "$protocol is not a valid protocol."
		exit 1
	fi

	if test "$aliastmp" = ""
	then
		aliastmp="-tmp=${sysconfdir}/aliases-$protocol.tmp"
	fi

	if test "$aliassrc" = ""
	then
		aliassrc="-src=${sysconfdir}/aliases-$protocol"
	fi

	if test "$aliasdump$aliasalias" = ""
	then
		aliasalias="-alias=${sysconfdir}/aliases-$protocol.dat"
	fi

	if test "$xaliasdir" = ""
	then
		xaliasdir="-xaliasdir=${sysconfdir}/$aliasdir/.courier-:xalias-$protocol"
	fi

	if test "$xaliastmpdir" = ""
	then
		xaliastmpdir="-xaliastmpdir=${sysconfdir}/$aliasdir/courier-:xalias-$protocol.tmp"
	fi
	xaliaspfix="-xaliaspfix=.xalias-$protocol/"
fi

if test "$module" = ""
then
	module='local'
fi

if test "$aliastmp" = ""
then
	aliastmp="-tmp=${sysconfdir}/aliases.tmp"
fi

if test "$aliassrc" = ""
then
	aliassrc="-src=${sysconfdir}/aliases"
fi

if test "$aliasdump$aliasalias" = ""
then
	aliasalias="-alias=${sysconfdir}/aliases.dat"
fi

if test "$xaliasdir" = ""
then
	xaliasdir="-xaliasdir=${sysconfdir}/$aliasdir/.courier-:xalias"
fi

if test "$xaliastmpdir" = ""
then
	xaliastmpdir="-xaliastmpdir=${sysconfdir}/$aliasdir/courier-:xalias.tmp"
fi

get_aliases() {

	aliasdir="$aliassrc"
	aliasdir="`echo $aliasdir | sed 's/^.....//'`"

	if test -d "$aliasdir"
	then
		for f in $aliasdir/*
		do
			if test -f $f
			then
				echo "##MaKeAlIaSeS##$f"
					# Hack, hack, hack...
				cat $f
			fi
		done | ${exec_prefix}/libexec/courier/aliasexp $xaliaspfix $xaliastmpdir $module
	else
		${exec_prefix}/libexec/courier/aliasexp $xaliaspfix $xaliastmpdir $aliassrc $module
	fi
}

if test "$dochk" = 1
then
	rm -f ${localstatedir}/tmp/aliaschk.tmp
	xaliasdir=""
	xaliastmpdir=""
	get_aliases | ${exec_prefix}/libexec/courier/aliascombine | \
	${exec_prefix}/libexec/courier/aliascreate \
		-tmp=${localstatedir}/tmp/aliaschk.tmp -dump=1 | \
	sed 's/.*: / /' | sort | uniq |
	while read ADDR
	do
		test "$ADDR" = "" && continue
		ERR=""`${exec_prefix}/libexec/courier/submit -vrfy="$ADDR" \
				$module 'unknown; unknown' `
		if test $? != 0
		then
			echo "<$ADDR>: $ERR"
			>${localstatedir}/tmp/aliaschk.tmp
		fi
	done
	test -f ${localstatedir}/tmp/aliaschk.tmp || exit 0
	rm -f ${localstatedir}/tmp/aliaschk.tmp
	exit 1
else
	tmpdir="`echo \"$xaliastmpdir\" | sed 's/^..............//'`"
	dir="`echo \"$xaliasdir\" | sed 's/^...........//'`"

	rm -rf $tmpdir

	get_aliases | ${exec_prefix}/libexec/courier/aliascombine | \
	${exec_prefix}/libexec/courier/aliascreate $aliastmp $aliasdump $aliasalias
	rc=$?
	if test "$rc" != 0
	then
		rm -rf $tmpdir
		exit $rc
	fi

	# Now carefully update the extended alias entries

	for f in $dir/*
	do
		test -f "$f" || continue
		f=`basename "$f"`
		test -f "$tmpdir/$f" || rm -f "$dir/$f" || exit 1
	done

	for f in $tmpdir/*
	do
		test -d "$dir" || mkdir "$dir" || exit 1
		test ! -f "$f" || mv -f "$f" "$dir" || exit 1
	done
	test ! -d "$tmpdir" || rmdir "$tmpdir" || exit 1
	rmdir $dir 2>/dev/null
fi
exit 0