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July 14, 2021 07:14
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using netcat to build a simple tcp proxy
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| #!/bin/sh -e | |
| # https://notes.tweakblogs.net/blog/7955/using-netcat-to-build-a-simple-tcp-proxy-in-linux.html | |
| 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 -l -p "$1" <"$BACK" | tee "$SENT" | nc "$2" "$3" | tee "$RCVD" >"$BACK" |
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