Created
February 12, 2020 23:01
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#!/bin/sh -e | |
if [ $# != 3 ] | |
then | |
echo "usage: $0 <src-port> <dst-host> <dst-port>" | |
exit 0 | |
fi | |
TMP=`mktemp -d` | |
BACK=$TMP/pipe.back | |
SENT=$TMP/pipe.sent | |
RCVD=$TMP/pipe.rcvd | |
trap 'rm -rf "$TMP"' EXIT | |
mkfifo -m 0600 "$BACK" "$SENT" "$RCVD" | |
sed 's/^/ => /' <"$SENT" & | |
sed 's/^/<= /' <"$RCVD" & | |
nc -v -l "$1" <"$BACK" | tee "$SENT" | nc -v "$2" "$3" | tee "$RCVD" >"$BACK" |
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