#!/bin/bash # https://gist.github.com/apk/2414478 # WebSocket shell, start & browse to http://:6655/ # Requires bash 4.x, openssl. # Author: rootshell@corelogics.de (which isn't me, apk) coproc d { nc -l -p 6656 -q 0; } nc -l -p 6655 -q 1 > /dev/null <<-ENDOFPAGE HTTP/1.1 200 OK ENDOFPAGE until read line; line=`tr -d '\r\n'<<<$line`; test -z "$line"; do test "${line:0:18}" = "Sec-WebSocket-Key:" && key=${line:19} test "${line:0:22}" = "Sec-WebSocket-Version:" && ver=$line done <&${d[0]} rkey=`echo -n ${key}258EAFA5-E914-47DA-95CA-C5AB0DC85B11|openssl dgst -sha1 -binary|base64` echo -ne "HTTP/1.1 101 Switching Protocols\r\n" >&${d[1]} echo -ne "Upgrade: websocket\r\nConnection: Upgrade\r\n" >&${d[1]} echo -ne "Sec-WebSocket-Accept: $rkey\r\n$ver\r\n\r\n" >&${d[1]} doasync() { bash -c "$1" | while read line; do while [ "${#line}" -gt 0 ]; do l2=${line:0:80} len=`echo -n "$l2" | wc -c | tr -d ' '` echo -ne "\x81\x`printf '%02x' $len`$l2" line=${line:80} done done & } while true; do reclen=$((`od -j 1 -N 1 -t dI -A n <&${d[0]}` - 128)) for i in `seq 0 3`; do mk[$i]=`od -N 1 -t dI -A n <&${d[0]}` done msg="" for i in `seq 0 $(($reclen - 1))`; do bt=`od -N 1 -t dI -A n <&${d[0]}` bt=$(($bt ^ ${mk[$(($i % 4))]})) msg="$msg$(echo -e "\x`printf '%02x' $bt`")" done test "$msg" = "exit" && break doasync "$msg" >&${d[1]} done echo >&${d[1]}-