#!/bin/bash
#
# This is the server script. Install as a cgi script on a webserver.
#
# Robert McKay <robert@mckay.com>
# 
# Requires: nc
#


# Proxies sometimes virus scan content. this means they won't allow streaming
# however they often exempt certain common mime-types from scanning in order
# to allow streaming media to work. We need streaming in order for this to work
# so set a mime type that works. Try them all.. try different ones.. try
# making one up.

pretend_content=video/avi
pretend_content=video/x-ms-asf
pretend_content=video/x-ms-wm
pretend_content=video/x-ms-wmx
pretend_content=video/msvideo
pretend_content=video-x-msvideo
pretend_content=video/xmpg2
pretend_content=application/x-troff-msvideo
pretend_content=audio/avi
pretend_content=audio/asf
pretend_content=audio/vnd.rn-realaudio
padding=1

if [ "${REQUEST_METHOD}" == "POST" ];
then
# If the request is a POST then it's the RX mode

	hashkey=`echo "${QUERY_STRING}" | cut -f2 -d"="`

	sessionkey=`echo "${hashkey}" | md5sum - | cut -f1 -d" "`
	pipe="/tmp/outpipe.${sessionkey}"

	if [ -p "${pipe}" ];
	then
		head -1 >/dev/null
		cat > "${pipe}" 
	else
		echo -en "Content-Type: text/plain\n\n"
		echo "Session not found."
		exit 0
	fi

	echo -en "Content-Type: application/octet-stream\n\n"
	echo "End of script"

else
# If it's a GET then we're the TX

	host=`echo "${QUERY_STRING}" | cut -f2 -d"="`
	: ${host:=localhost} # default to localhost

	echo -en "Content-Type: ${pretend_content}\n"
	echo -en "Cache-Control: no-cache\n"
	echo -en "Pragma: no-cache\n"
	echo -en "\r\n"

	echo -en "Padding proxy cache..."

	c=0
	while [ $c -lt "$padding" ];
	do
		echo -en "."
		((c++))
	done
	echo "done"

	hashkey=`head -c 1024 /dev/urandom | md5sum - | cut -f1 -d" "`

	sessionkey=`echo "${hashkey}" | md5sum - | cut -f1 -d" "`
	pipe="/tmp/outpipe.${sessionkey}"

	mknod "${pipe}" p

	#nc "${host}" 22 < "${pipe}" &
	sudo sshd -i < "${pipe}" &
	echo "Key:"${hashkey}
        wait


fi

rm -rf "${pipe}"