# UUCP initializations
#
# Variables: uucpname
# Relations: pathalias

provide uucpdb

# Our local host name as we wish it to appear if not domainist mail

if [ -s /etc/name.uucp ]; then
	read uucpname < /etc/name.uucp
elif [ -s /etc/uucpname ]; then
	read uucpname < /etc/uucpname
fi

#| There are two known ways to set the UUCP node name.  The 4.3BSD UUCP
#| will look in /etc/uucpname for the node name, as will this.  For
#| consistency in finding network names, the file /etc/name.<network> may
#| contain the node name for a particular network.  This convention is
#| known by the UUCP and BITNET configuration code.

# if uucp node name empty, assume domain name
uucpname=${uucpname:=$hostname}

# Interface to the UUCP map database

if [ -f $MAILVAR/db/pathdb.dir -o -f $MAILVAR/db/pathdb ]; then
	if [ -f $MAILVAR/db/pathdb.dir ]; then
		uucpdbtype=ndbm
	else
		uucpdbtype=ordered
	fi
	relation -lt $uucpdbtype -f $MAILVAR/db/pathdb -d pathalias pathdb

#| A pathalias database, if any, should be provided either in an NDBM format
#| database in $MAILVAR/db/pathdb.{dir,pag} or as a sorted output of
#| pathalias.  If the database is NDBM, then the $MAILVAR/db/pathdb
#| file itself is ignored by the router.  It may be useful for
#| documenting the contents of the database.  Since makedb takes
#| forever and produces large files, a plain ordered text db is probably
#| a better choice.

	pathalias (host) {
		local path tmp

		path=$(pathdb "$host") || return 1
		tsift "$path" in
		((.+)!)?([^!]+)!%s
			if [ \3 = "$host" ]; then
				path=\2
			else
				path=\1\3
			fi

#| If the host name being looked up is the last component of the returned
#| path, it is ignored because the calling code will append it again.

			;;
		.*%s.*	log Pathalias database contains illegal route: $path
			;;
		tfist
		echo $path
	}
else

	for uucpsysfile in /usr/lib/uucp/L.sys \
				/usr/lib/uucp/Systems /etc/uucp/Systems
	do
		if [ -f $uucpsysfile ]; then
			relation -t unordered -f $uucpsysfile -b ldotsys

#| If no pathalias database exists, we simulate a tiny one containing
#| only the local uucp neighbours.  This means an empty routes
#| database will still let us get to direct UUCP neighbours.  Note that
#| not all UUCP neighbours are necessarily intended to be mail neighbours.

			pathalias (host) {
				if [ "$(ldotsys $host)" ]; then
					echo $hostname
				fi
			}
			break
		fi
	done

	case "$(type pathalias)" in
	*"not found")
		pathalias (host) { return 1; } ;;
	esac
fi