#!/bin/sh
# Wrapper script for use of the tsocks(8) transparent socksification library
#
# There are three forms of usage for this script:
#
# /usr/bin/tsocks program [program arguments...]
#
# This form sets the users LD_PRELOAD environment variable so that tsocks(8) 
# will be loaded to socksify the application then executes the specified 
# program (with the provided arguments). The following simple example might 
# be used to telnet to www.foo.org via a tsocks.conf(5) configured socks server:
#
# /usr/bin/tsocks telnet www.foo.org
#
# The second form allows for tsocks(8) to be switched on and off for a 
# session (that is, it adds and removes tsocks from the LD_PRELOAD environment
# variable). This form must be _sourced_ into the user's existing session
# (and will only work with bourne shell users):
#
# . /usr/bin/tsocks on
# telnet www.foo.org 
# . /usr/bin/tsocks off
# 
# Or
# 
# source /usr/bin/tsocks on
# telnet www.foo.org
# source /usr/bin/tsocks off
#
# The third form creates a new shell with LD_PRELOAD set and is achieved
# simply by running the script with no arguments 
# 
# /usr/bin/tsocks
#
# When finished the user can simply terminate the shell with 'exit'
# 
# This script is originally from the debian tsocks package by 
# Tamas Szerb <toma@rulez.org>

if [ $# = 0 ] ; then
   echo "$0: insufficient arguments"
   exit
fi

case "$1" in
	on|-on)
		if [ -z "$LD_PRELOAD" ]
			then
				export LD_PRELOAD="libtsocks.so"
			else
				echo $LD_PRELOAD | grep -q "libtsocks\.so" || \
				export LD_PRELOAD="libtsocks.so $LD_PRELOAD"
		fi
	;;
	off|-off)
		export LD_PRELOAD=`echo -n $LD_PRELOAD | sed 's/libtsocks.so \?//'`
		if [ -z "$LD_PRELOAD" ]
			then
				unset LD_PRELOAD
		fi
	;;
	show|sh|-sh|-show)
		echo "LD_PRELOAD=\"$LD_PRELOAD\""
	;;
	-h|-?)
      echo "$0: Please see tsocks(1) or read comment at top of $0"
   ;;
	*)
		if [ -z "$LD_PRELOAD" ]
		then
			export LD_PRELOAD="libtsocks.so"
		else
			echo $LD_PRELOAD | grep -q "libtsocks\.so" || \
			export LD_PRELOAD="libtsocks.so $LD_PRELOAD"
		fi

		if [ $# = 0 ]
		then
			${SHELL:-/bin/sh}
		fi

		if [ $# -gt 0 ]
		then
			exec "$@"
		fi
	;;
esac

#EOF