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#! /usr/bin/env bash
# Copyright Gerhard Rieger and contributors (see file CHANGES)
# Published under the GNU General Public License V.2, see file COPYING
# Shell script to perform group communications, sometimes called brokering.
# It starts a Socat instance that forks a child process for each
# connected client; the clients communicate via IPv4 broadcast
# Examples:
# socat-broker.sh TCP-L:1234
# Now connect with an arbitrary number of clients like TCP:<server>:1234
# socat-broker.sh SSL-L:1234,cert=server.pem,cafile=clients.crt
# Now connect with an arbitrary number of clients like SSL:<server>:1234,cafile=server.cert=clients.pem
ECHO="echo -e"
usage () {
$ECHO "Usage: $0 <options> <listener>"
$ECHO " <listener> is a passive address like TCP4-L or SSL-L"
$ECHO " <options>:"
$ECHO " -d* -S -t <timeout> -T <timeout> are passed to socat"
$ECHO " -V prints the socat command before starting it"
$ECHO "For example:"
$ECHO " $0 \\"
$ECHO " TCP4-L:1234"
$ECHO "Then connect with clients to port 1234"
$ECHO "Data sent by any client is forwarded to all other clients"
}
VERBOSE= QUIET= OPTS=
while [ "$1" ]; do
case "X$1" in
X-h) usage; exit ;;
X-V) VERBOSE=1 ;;
X-q) QUIET=1; OPTS="-d0" ;;
X-d*|X-l?*) OPTS="$OPTS $1" ;;
X-b|X-S|X-t|X-T|X-l) OPT=$1; shift; OPTS="$OPTS $OPT $1" ;;
X-) break ;;
X-*) echo "Unknown option \"$1\"" >&2
usage >&2
exit 1 ;;
*) break ;;
esac
shift
done
LISTENER="$1"
if [ -z "$LISTENER" ]; then
echo "$0: Missing parameter" >&2
usage >&2
exit 1
fi
shopt -s nocasematch
if ! [[ "$LISTENER" =~ .*,fork ]] || [[ "$LISTENER" =~ .*,fork, ]]; then
LISTENER="$LISTENER,fork"
fi
case "$0" in
*/*) SOCAT=${0%/*}/socat ;;
*) SOCAT=socat ;;
esac
PORT=$($SOCAT -d -d -T 0.000001 UDP4-RECV:0 /dev/null 2>&1 |grep bound |sed 's/.*:\([1-9][0-9]*\)$/\1/')
if [ -z "$PORT" ]; then
echo "$0: Failed to determine free UDP port" >&2
exit 1
fi
BCADDR=127.255.255.255
if [ "$VERBOSE" ]; then
echo -e "$SOCAT -lp socat-broker $OPTS \\
$LISTENER \
UDP4-DATAGRAM:$BCADDR:$PORT,bind=:$PORT,so-broadcast,so-reuseaddr"
fi
$SOCAT -lp socat-broker $OPTS \
"$LISTENER" \
"UDP4-DATAGRAM:$BCADDR:$PORT,bind=:$PORT,so-broadcast,so-reuseaddr"
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