tsocks

#!/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 DYLD_INSERT_LIBRARIES 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 DYLD_INSERT_LIBRARIES 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 DYLD_INSERT_LIBRARIES 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

LIBDIR="/lib"
LIB_NAME="libtsocks"
SHLIB_EXT="dylib"
SHLIB="${LIBDIR}/${LIB_NAME}.${SHLIB_EXT}"

function show() {
    echo "DYLD_FORCE_FLAT_NAMESPACE     = $DYLD_FORCE_FLAT_NAMESPACE"
    echo "DYLD_INSERT_LIBRARIES         = \"$DYLD_INSERT_LIBRARIES\""
}
        
case "$1" in
	on)
		if [ -z "$DYLD_INSERT_LIBRARIES" ]
			then
                export DYLD_FORCE_FLAT_NAMESPACE=1
                echo "Setting DYLD_INSERT_LIBRARIES ..."                
				export DYLD_INSERT_LIBRARIES="${SHLIB}"
			else
                echo "Appending to DYLD_INSERT_LIBRARIES ..."
				echo $DYLD_INSERT_LIBRARIES | grep -q "${SHLIB}" || \
				export DYLD_INSERT_LIBRARIES="${SHLIB} $DYLD_INSERT_LIBRARIES"
		fi
        show
	;;
	off)
        unset DYLD_FORCE_FLAT_NAMESPACE
        echo "Removing ${SHLIB} from DYLD_INSERT_LIBRARIES ..."
		export DYLD_INSERT_LIBRARIES=`echo -n $DYLD_INSERT_LIBRARIES | sed 's#/lib/libtsocks\.dylib *##'`
		if [ -z "$DYLD_INSERT_LIBRARIES" ]
			then                   
				unset DYLD_INSERT_LIBRARIES
		fi
        show
	;;
	show|sh)
		show
	;;
	-h|-?)
      echo "$0: Please see tsocks(1) or read comment at top of $0"
   ;;
	*)
		if [ -z "$DYLD_INSERT_LIBRARIES" ]
		then
			export DYLD_INSERT_LIBRARIES="${SHLIB}"
                        export DYLD_FORCE_FLAT_NAMESPACE=1
		else
			echo $DYLD_INSERT_LIBRARIES | grep -q "${SHLIB}" || \
			export DYLD_INSERT_LIBRARIES="${SHLIB} $DYLD_INSERT_LIBRARIES"
		fi

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

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

#EOF