#stone.sh
#with error control as in guide/

#FIXME: translate all comments into english

#params
# proto# connexion_file plugin_port trustpeer_port
PARAMNUMBER=4

#connexion contient 3 lignes et c'est tout:
#connexion version#
#machine_distante:port_distant/protocole
#port_local/protocole

#il suffit de remplacer protocole par ssl pour utiliser les facilités du paquet stone-ssl

#TODO a sh include file with macros, you will use inside your shell scripts with the source command
ERRPROG=1
ERRNORM=2

#d'abord on teste le nombre de parametres sinon usage sur stderr et return ERRPROG pour signaler precondition 1 fausse
if test $# -ne $PARAMNUMBER
	then echo "stone.sh: PRECONDITION 1 ASSERTION FAILED: needs $PARAMNUMBER parameters: proto# connexion_file plugin_port trustpeer_port">&2
		exit $ERRPROG
fi

#ensuite on lance un stone qui va forwarder de A/udp vers B/ssl, on retourne le code d'erreur de stone si il marche pas
#first we need a handler for sigchld (a background job sends SIGCHLD when it finishes)
trap "kill %1;kill %2;echo 'stone_tcptp.sh: INVARIANT 1 ASSERTION FAILED: a background stone aborts'>&2;return ERRPROG" SIGCHLD
stone `head -n 3 $2|tail -n 1` localhost:$3/tcp &
#what follows is of no use with background commands &
#if [ $? -ne 0 ]
#	then ERR=$?;echo "stone.sh: first stone returns error $?">&2
#		exit $ERR
#fi

#FIXME: we should return 3 when 2 connexion files have the same plugin server port, and ERRNORM when a connexion file is incorrect

#PUIS de B/ssl vers A/udp, 4040 est arbitraire et est négociable pour chaque ami
#c'est la valeur qui sera dans le connexion de l'ami
stone localhost:$4/tcp localhost:`head -n 4 $2|tail -n 1` &
#if [ $? -ne 0 ]
#	then ERR=$?;echo "stone.sh: 2nd stone returns error $?">&2
#		exit $ERR
#fi

#a sleep is needed to get a SIGCHLD if a background stone aborts after a few seconds
sleep 2

#no error
exit 0