Mini Shell

#!/bin/sh

# To test this OpenSSL version's applications against another version's
# shared libraries, simply set
#
#     OPENSSL_REGRESSION=/path/to/other/OpenSSL/build/tree
if [ -n "$OPENSSL_REGRESSION" ]; then
    shlibwrap="$OPENSSL_REGRESSION/util/shlib_wrap.sh"
    if [ -x "$shlibwrap" ]; then
        # We clear OPENSSL_REGRESSION to avoid a loop, should the shlib_wrap.sh
        # we exec also support that mechanism...
        OPENSSL_REGRESSION= exec "$shlibwrap" "$@"
    else
        if [ -f "$shlibwrap" ]; then
            echo "Not permitted to run $shlibwrap" >&2
        else
            echo "No $shlibwrap, perhaps OPENSSL_REGRESSION isn't properly set?" >&2
        fi
        exit 1
    fi
fi

[ $# -ne 0 ] || set -x		# debug mode without arguments:-)

THERE="`echo $0 | sed -e 's|[^/]*$||' 2>/dev/null`.."
[ -d "${THERE}" ] || exec "$@"	# should never happen...

LIBCRYPTOSO="${THERE}/libcrypto.so.81.3"
LIBSSLSO="${THERE}/libssl.so.81.3"

SYSNAME=`(uname -s) 2>/dev/null`;
case "$SYSNAME" in
SunOS|IRIX*)
	# SunOS and IRIX run-time linkers evaluate alternative
	# variables depending on target ABI...
	rld_var=LD_LIBRARY_PATH
	case "`(/usr/bin/file "$LIBCRYPTOSO") 2>/dev/null`" in
	*ELF\ 64*SPARC*|*ELF\ 64*AMD64*)
		[ -n "$LD_LIBRARY_PATH_64" ] && rld_var=LD_LIBRARY_PATH_64
		LD_PRELOAD_64="$LIBCRYPTOSO $LIBSSLSO"; export LD_PRELOAD_64
		preload_var=LD_PRELOAD_64
		;;
	*ELF\ 32*SPARC*|*ELF\ 32*80386*)
		# We only need to change LD_PRELOAD_32 and LD_LIBRARY_PATH_32
		# on a multi-arch system.  Otherwise, trust the fallbacks.
		if [ -f /lib/64/ld.so.1 ]; then
		    [ -n "$LD_LIBRARY_PATH_32" ] && rld_var=LD_LIBRARY_PATH_32
		    LD_PRELOAD_32="$LIBCRYPTOSO $LIBSSLSO"; export LD_PRELOAD_32
		    preload_var=LD_PRELOAD_32
		fi
		;;
	# Why are newly built .so's preloaded anyway? Because run-time
	# .so lookup path embedded into application takes precedence
	# over LD_LIBRARY_PATH and as result application ends up linking
	# to previously installed .so's. On IRIX instead of preloading
	# newly built .so's we trick run-time linker to fail to find
	# the installed .so by setting _RLD_ROOT variable.
	*ELF\ 32*MIPS*)
		#_RLD_LIST="$LIBCRYPTOSO:$LIBSSLSO:DEFAULT"; export _RLD_LIST
		_RLD_ROOT=/no/such/dir; export _RLD_ROOT
		eval $rld_var=\"/usr/lib'${'$rld_var':+:$'$rld_var'}'\"
		preload_var=_RLD_LIST
		;;
	*ELF\ N32*MIPS*)
		[ -n "$LD_LIBRARYN32_PATH" ] && rld_var=LD_LIBRARYN32_PATH
		#_RLDN32_LIST="$LIBCRYPTOSO:$LIBSSLSO:DEFAULT"; export _RLDN32_LIST
		_RLDN32_ROOT=/no/such/dir; export _RLDN32_ROOT
		eval $rld_var=\"/usr/lib32'${'$rld_var':+:$'$rld_var'}'\"
		preload_var=_RLDN32_LIST
		;;
	*ELF\ 64*MIPS*)
		[ -n "$LD_LIBRARY64_PATH"  ] && rld_var=LD_LIBRARY64_PATH
		#_RLD64_LIST="$LIBCRYPTOSO:$LIBSSLSO:DEFAULT"; export _RLD64_LIST
		_RLD64_ROOT=/no/such/dir; export _RLD64_ROOT
		eval $rld_var=\"/usr/lib64'${'$rld_var':+:$'$rld_var'}'\"
		preload_var=_RLD64_LIST
		;;
	esac
	eval $rld_var=\"${THERE}'${'$rld_var':+:$'$rld_var'}'\"; export $rld_var
	unset rld_var
	;;
NONSTOP_KERNEL)
	# HPE NonStop has a proprietary mechanism for specifying
	# the location of DLLs. It does not use PATH or variables
	# commonly used on other platforms. The platform has a limited
	# environment space keeping extraneous variables to a minimum
	# is recommended.
	_RLD_LIB_PATH="${THERE}:$LD_LIBRARY_PATH"
	export _RLD_LIB_PATH
	;;
*)	LD_LIBRARY_PATH="${THERE}:$LD_LIBRARY_PATH"	# Linux, ELF HP-UX
	DYLD_LIBRARY_PATH="${THERE}:$DYLD_LIBRARY_PATH"	# MacOS X
	SHLIB_PATH="${THERE}:$SHLIB_PATH"		# legacy HP-UX
	LIBPATH="${THERE}:$LIBPATH"			# AIX, OS/2
	export LD_LIBRARY_PATH DYLD_LIBRARY_PATH SHLIB_PATH LIBPATH
	# Even though $PATH is adjusted [for Windows sake], it doesn't
	# necessarily does the trick. Trouble is that with introduction
	# of SafeDllSearchMode in XP/2003 it's more appropriate to copy
	# .DLLs in vicinity of executable, which is done elsewhere...
	if [ "$OSTYPE" != msdosdjgpp ]; then
		PATH="${THERE}:$PATH"; export PATH
	fi
	;;
esac



cmd="$1"; [ -x "$cmd" ] || cmd="$cmd${EXE_EXT}"
shift
if [ $# -eq 0 ]; then
	exec "$cmd"	# old sh, such as Tru64 4.x, fails to expand empty "$@"
else
	exec "$cmd" "$@"
fi