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File proxy.sh

#! /usr/bin/env bash
# source: proxy.sh
# Copyright Gerhard Rieger and contributors (see file CHANGES)
# Published under the GNU General Public License V.2, see file COPYING

# perform primitive simulation of a proxy server.
# accepts and answers correct HTTP CONNECT requests on stdio, and tries to
# establish the connection to the given server.
# it is required for socats test.sh
# for TCP, use this script as:
# socat tcp-l:8080,reuseaddr,fork exec:"proxy.sh",nofork

# 20130622  GR allow hostnames, not only IP addresses

if [ -z "$SOCAT" ]; then
    if type socat >/dev/null 2>&1; then
	SOCAT=socat
    else
	SOCAT="./socat"
    fi
fi

if   [ $(echo "x\c") = "x" ]; then E=""
elif [ $(echo -e "x\c") = "x" ]; then E="-e"
else
    echo "cannot suppress trailing newline on echo" >&2
    exit 1
fi
ECHO="echo $E"
CR=$($ECHO "\r")
#echo "CR=$($ECHO "$CR\c" |od -c)" >&2

case `uname` in
HP-UX|OSF1)
    # their cats are too stupid to work with unix domain sockets
    CAT="$SOCAT -u stdin stdout"
    ;;
*)
    CAT=cat
    ;;
esac

SPACES=" "
while [ -n "$1" ]; do
    case "$1" in
    -w) n="$2"; while [ "$n" -gt 0 ]; do SPACES="$SPACES "; n=$((n-1)); done
	shift ;;
    #-s) STAT="$2"; shift ;;
    esac
    shift
done

badrequest () {
    $ECHO "HTTP/1.0${SPACES}500 Bad Request$CR"
    $ECHO "$CR"
}

# read and parse HTTP request
read m a h
#echo "\"$m\" \"$a\" \"$h\"" >&2
if [ "$m" != 'CONNECT' ]; then
    badrequest; exit 1
fi
if [[ "$a" == [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+ ]]; then
    : go on below
elif [[ "$a" == [0-9a-zA-Z-.][0-9a-zA-Z-.]*:[0-9][0-9]* ]]; then
    : go on below
else
    badrequest; exit 1
fi

if [[ "$h" == HTTP/1.[01][[:space:]]* ]]; then
    : go on below
else
    badrequest; exit 1
fi

# read more headers until empty line
while [ "$l" != "$CR" ]; do
    read l
done

# send status
$ECHO "HTTP/1.0${SPACES}200 OK$CR"
# send empty line
$ECHO "$CR"

# perform proxy (relay) function
$SOCAT $SOCAT_OPTS - tcp:$a || {
    $ECHO "HTTP/1.0${SPACES}500 Failed to connect to $a$CR"
    $ECHO $CR
}

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-16 10:59:07
..	DIR	-	drwxr-xr-x	2025-10-09 10:58:24
BUGREPORTS	text/plain	746 B	-rw-r--r--	2016-07-21 09:28:19
CHANGES	text/plain	67.56 KB	-rw-r--r--	2025-07-15 09:33:17
COPYING	text/plain	17.67 KB	-rw-r--r--	2017-01-06 07:28:42
COPYING.OpenSSL	text/plain	6.13 KB	-rw-r--r--	2016-07-21 09:28:19
DEVELOPMENT	text/x-c	8.99 KB	-rw-r--r--	2021-01-03 06:23:22
EXAMPLES	text/html	17.01 KB	-rw-r--r--	2021-01-03 06:23:22
FAQ	text/plain	3.75 KB	-rw-r--r--	2019-04-04 08:59:55
PORTING	text/plain	3.02 KB	-rw-r--r--	2016-07-21 09:28:19
README	text/x-c	11.47 KB	-rw-r--r--	2021-01-03 06:23:22
SECURITY	text/plain	1.81 KB	-rw-r--r--	2016-07-21 09:28:19
daemon.sh	text/x-shellscript	903 B	-rw-r--r--	2025-07-15 09:33:29
ftp.sh	text/x-shellscript	4.12 KB	-rw-r--r--	2025-07-15 09:33:29
gatherinfo.sh	text/x-shellscript	4.03 KB	-rw-r--r--	2025-07-15 09:33:29
mail.sh	text/x-shellscript	2.02 KB	-rw-r--r--	2025-07-15 09:33:29
proxy.sh	text/x-shellscript	1.99 KB	-rw-r--r--	2025-07-15 09:33:29
proxyecho.sh	text/x-shellscript	1.2 KB	-rw-r--r--	2025-07-15 09:33:29
readline-test.sh	text/x-shellscript	1.26 KB	-rw-r--r--	2025-07-15 09:33:29
readline.sh	text/x-shellscript	764 B	-rw-r--r--	2025-07-15 09:33:29
socat_buildscript_for_android.sh	text/x-shellscript	3.5 KB	-rw-r--r--	2025-07-15 09:33:29
socks4a-echo.sh	text/x-shellscript	2.52 KB	-rw-r--r--	2025-07-15 09:33:29
socks4echo.sh	text/x-shellscript	2.31 KB	-rw-r--r--	2025-07-15 09:33:29
test.sh	text/x-shellscript	456.32 KB	-rw-r--r--	2025-07-15 09:33:29

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