proxyecho.sh

   1 #! /bin/bash
   2 # source: proxyecho.sh
   3 # Copyright Gerhard Rieger 2003-2009
   4 # Published under the GNU General Public License V.2, see file COPYING
   5
   6 # perform primitive simulation of a proxy server with echo function via stdio.
   7 # accepts and answers correct HTTP CONNECT requests, but then just echoes data.
   8 # it is required for test.sh
   9 # for TCP, use this script as:
  10 # socat tcp-l:8080,reuseaddr,crlf system:"proxyecho.sh"
  11
  12 if type socat >/dev/null 2>&1; then
  13     SOCAT=socat
  14 else
  15     SOCAT=./socat
  16 fi
  17
  18 case `uname` in
  19 HP-UX|OSF1)
  20     CAT="$SOCAT -u stdin stdout"
  21     ;;
  22 *)
  23     CAT=cat
  24     ;;
  25 esac
  26
  27 SPACES=" "
  28 while [ -n "$1" ]; do
  29     case "$1" in
  30     -w) n="$2"; while [ "$n" -gt 0 ]; do SPACES="$SPACES "; n=$((n-1)); done
  31         shift ;;
  32     #-s) STAT="$2"; shift ;;
  33     esac
  34     shift
  35 done
  36
  37 # read and parse HTTP request
  38 read l
  39 if echo "$l" |egrep '^CONNECT +[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+ +HTTP/1.[01]$' >/dev/null
  40 then
  41     : go on below
  42 else
  43     echo "HTTP/1.0${SPACES}500 Bad Request"
  44     echo
  45     exit
  46 fi
  47
  48 # read more headers until empty line
  49 while [ -n "$l" ]; do
  50     read l
  51 done
  52
  53 # send status
  54 echo "HTTP/1.0${SPACES}200 OK"
  55 # send empty line
  56 echo
  57
  58 # perform echo function
  59 exec $CAT