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socat-chain.sh, socat-mux.sh, and socat-broker.sh work with older Socat versions

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This commit is contained in:
Gerhard Rieger 2024-02-23 10:50:55 +01:00
parent 9fe8206b52
commit 1241600b81
5 changed files with 55 additions and 19 deletions

24
socat-broker.sh
View file

@ -21,7 +21,7 @@ usage () {
$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 " -V Shows executed Socat commands and some infos"
$ECHO "For example:"
$ECHO " $0 \\"
$ECHO " TCP4-L:1234"
@ -60,15 +60,29 @@ if ! [[ "$LISTENER" =~ .*,fork ]] || [[ "$LISTENER" =~ .*,fork, ]]; then
fi
case "$0" in
*/*) SOCAT=${0%/*}/socat ;;
*) SOCAT=socat ;;
*/*) if [ -x ${0%/*}/socat ]; then SOCAT=${0%/*}/socat; fi ;;
esac
if [ -z "$SOCAT" ]; then SOCAT=socat; fi
[ "$VERBOSE" ] && echo "# $0: Using executable $SOCAT" >&2
# We need a free UDP port (on loopback)
PORT=$($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
# Probably old Socat version, use a different approach
if type ss >/dev/null 2>&1; then
:
elif type netstat >/dev/null 2>&1; then
alias ss=netstat
else
echo "$0: Failed to determine free UDP port (old Socat version, no ss, no netstat?)" >&2
exit 1
fi
PORT=
while [ -z "$PORT" ] || ss -aun |grep -e ":$PORT\>" >/dev/null; do
PORT=$((16384+RANDOM))
done
fi
[ "$VERBOSE" ] && echo "# $0: Using UDP port $PORT" >&2
BCADDR=127.255.255.255