socatlog

#!/bin/bash

# Start proxying and logging with socat
# usage listenport desthost filelog

if [[ $1 == "" ]]; then
    SCRIPTNAME="$(basename $0)"
    echo "Start proxying and logging with socat, mainly used for debugging"
    echo 
    echo "Usage : "
    echo "  $SCRIPTNAME [listenport] [desthost] [filelog]"
    echo "Leave [filelog] empty for auto-generated name in current directory"
    echo 
    echo "example :"
    echo "  $SCRIPTNAME 12000 localhost:4500 log.txt"
    echo "  $SCRIPTNAME 8080 google.com:80"
    exit
fi

LISTENPORT="$1"
DESTHOST="$2"

if [[ $3 = "" ]]; then 
  FILENAME="packet_$(date '+%H%M%S_%d_%m_%y').log"
else
  FILENAME="$3"
fi

socat -v -d "TCP-LISTEN:$LISTENPORT,fork" "TCP:$DESTHOST" 2>&1 | tee "$FILENAME" 2>&1