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|
#!/bin/sh
# gzexe: compressor for Unix executables.
# Use this only for binaries that you do not use frequently.
#
# The compressed version is a shell script which decompresses itself after
# skipping $skip lines of shell commands. We try invoking the compressed
# executable with the original name (for programs looking at their name).
# We also try to retain the original file permissions on the compressed file.
# For safety reasons, gzexe will not create setuid or setgid shell scripts.
# WARNING: the first line of this file must be either : or #!/bin/sh
# The : is required for some old versions of csh.
# On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5
#
# $OpenBSD: gzexe,v 1.7 2003/02/08 10:19:30 pvalchev Exp $
x=`basename "$0"`
if test $# = 0; then
echo compress executables. original file foo is renamed to foo~
echo usage: ${x} [-d] files...
echo " -d decompress the executables"
exit 1
fi
decomp=0
res=0
test "$x" = "ungzexe" && decomp=1
if test "x$1" = "x-d"; then
decomp=1
shift
fi
tail=""
IFS="${IFS= }"; saveifs="$IFS"; IFS="${IFS}:"
for dir in $PATH; do
test -z "$dir" && dir=.
if test -f $dir/tail; then
tail="$dir/tail"
break
fi
done
IFS="$saveifs"
if test -z "$tail"; then
echo cannot find tail
exit 1
fi
for i do
if test ! -f "$i" ; then
echo ${x}: $i not a file
res=1
continue
fi
if test $decomp -eq 0; then
if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
echo "${x}: $i is already gzexe'd"
continue
fi
fi
if ls -l "$i" | grep '^...[sS]' > /dev/null; then
echo "${x}: $i has setuid permission, unchanged"
continue
fi
if ls -l "$i" | grep '^......[sS]' > /dev/null; then
echo "${x}: $i has setgid permission, unchanged"
continue
fi
case "`basename $i`" in
sh | gzip | tail | chmod | ln | sleep | rm | sed | mktemp)
echo "${x}: $i would depend on itself"; continue ;;
esac
tmp=`/usr/bin/mktemp gzXXXXXXXXXX` || exit 1
trap "rm -f $tmp; exit 1" 1 2 3 5 10 13 15
cp -p "$i" $tmp 2>/dev/null || cp "$i" $tmp
if test -w $tmp 2>/dev/null; then
writable=1
else
writable=0
chmod u+w $tmp 2>/dev/null
fi
if test $decomp -eq 0; then
sed 1q "$0" > $tmp
sed "s|^if tail|if $tail|" >> $tmp <<'EOF'
skip=14
tmpdir=`/usr/bin/mktemp -d /tmp/gzexeXXXXXXXXXX` || {
rm -f ${tmp}
exit 1
}
prog="${tmpdir}/`echo \"$0\" | sed 's|^.*/||'`"
if tail +$skip "$0" | gzip -cd > "$prog"; then
chmod 700 "$prog"
trap '/bin/rm -rf $tmpdir exit $res' 0
"$prog" ${1+"$@"}; res=$?
else
echo Cannot decompress $0
rm -rf $tmpdir
exit 1
fi; exit $res
EOF
gzip -cv9 "$i" >> $tmp || {
/bin/rm -f $tmp
echo ${x}: compression not possible for $i, file unchanged.
res=1
continue
}
else
# decompression
skip=18
if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
eval `sed -e 1d -e 2q "$i"`
fi
if tail +$skip "$i" | gzip -cd > $tmp; then
:
else
echo ${x}: $i probably not in gzexe format, file unchanged.
/bin/rm -f $tmp
res=1
continue
fi
fi
rm -f "$i~"
mv "$i" "$i~" || {
echo ${x}: cannot backup $i as $i~
/bin/rm -f $tmp
res=1
continue
}
mv $tmp "$i" || cp -p $tmp "$i" 2>/dev/null || cp $tmp "$i" || {
echo ${x}: cannot create $i
/bin/rm -f $tmp
res=1
continue
}
/bin/rm -f $tmp
if test $writable -eq 0; then
chmod u-w $i 2>/dev/null
fi
done
exit $res
|
