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|
#!/usr/bin/env bash
#
# Script to install host system binaries along with required libraries.
#
# Copyright (C) 2012-2017 Jo-Philipp Wich <jo@mein.io>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
DIR="$1"; shift
_cp() {
cp ${VERBOSE:+-v} -L "$1" "$2" || {
echo "cp($1 $2) failed" >&2
exit 1
}
}
_mv() {
mv ${VERBOSE:+-v} "$1" "$2" || {
echo "mv($1 $2) failed" >&2
exit 1
}
}
_md() {
mkdir ${VERBOSE:+-v} -p "$1" || {
echo "mkdir($1) failed" >&2
exit 2
}
}
_ln() {
ln ${VERBOSE:+-v} -sf "$1" "$2" || {
echo "ln($1 $2) failed" >&2
exit 3
}
}
_relpath() {
local base="$(readlink -f "$1")"
local dest="$(readlink -f "$2")"
local up
[ -d "$base" ] || base="${base%/*}"
[ -d "$dest" ] || dest="${dest%/*}"
while true; do
case "$base"
in "$dest"/*)
echo "$up/${base#$dest/}"
break
;;
*)
dest="${dest%/*}"
up="${up:+$up/}.."
;;
esac
done
}
_runas_so() {
cat <<-EOT | ${CC:-gcc} -x c -fPIC -shared -o "$1" -
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int mangle_arg0(int argc, char **argv, char **env) {
char *arg0 = getenv("RUNAS_ARG0");
if (arg0) {
argv[0] = arg0;
unsetenv("RUNAS_ARG0");
}
return 0;
}
#ifdef __APPLE__
__attribute__((section("__DATA,__mod_init_func")))
#else
__attribute__((section(".init_array")))
#endif
static void *mangle_arg0_constructor = &mangle_arg0;
EOT
[ -x "$1" ] || {
echo "compiling preload library failed" >&2
exit 5
}
}
_patch_ldso() {
_cp "$1" "$1.patched"
sed -i -e 's,/\(usr\|lib\|etc\)/,/###/,g' "$1.patched"
if "$1.patched" 2>&1 | grep -q -- --library-path; then
_mv "$1.patched" "$1"
else
echo "binary patched ${1##*/} not executable, using original" >&2
rm -f "$1.patched"
fi
}
_patch_glibc() {
_cp "$1" "$1.patched"
sed -i -e 's,/usr/\(\(lib\|share\)/locale\),/###/\1,g' "$1.patched"
if "$1.patched" 2>&1 | grep -q -- GNU; then
_mv "$1.patched" "$1"
else
echo "binary patched ${1##*/} not executable, using original" >&2
rm -f "$1.patched"
fi
}
should_be_patched() {
local bin="$1"
[ -x "$bin" ] || return 1
case "$bin" in
*.so|*.so.[0-9]*)
return 1
;;
*)
file "$bin" | grep -sqE "ELF.*(executable|interpreter)" && return 0
;;
esac
return 1
}
for LDD in ${PATH//://ldd }/ldd; do
"$LDD" --version >/dev/null 2>/dev/null && break
LDD=""
done
[ -n "$LDD" -a -x "$LDD" ] || LDD=
for BIN in "$@"; do
[ -n "$BIN" -a -n "$DIR" ] || {
echo "Usage: $0 <destdir> <executable> ..." >&2
exit 1
}
[ ! -d "$DIR/lib" ] && {
_md "$DIR/lib"
_md "$DIR/usr"
_ln "../lib" "$DIR/usr/lib"
}
[ ! -x "$DIR/lib/runas.so" ] && {
_runas_so "$DIR/lib/runas.so"
}
LDSO=""
[ -n "$LDD" ] && should_be_patched "$BIN" && {
for token in $("$LDD" "$BIN" 2>/dev/null); do
case "$token" in */*.so*)
dest="$DIR/lib/${token##*/}"
ddir="${dest%/*}"
case "$token" in
*/ld-*.so*) LDSO="${token##*/}" ;;
esac
[ -f "$token" -a ! -f "$dest" ] && {
_md "$ddir"
_cp "$token" "$dest"
case "$token" in
*/ld-*.so*) _patch_ldso "$dest" ;;
*/libc.so.6) _patch_glibc "$dest" ;;
esac
}
;; esac
done
}
# is a dynamically linked executable
if [ -n "$LDSO" ]; then
echo "Bundling ${BIN##*/}"
RUNDIR="$(readlink -f "$BIN")"; RUNDIR="${RUNDIR%/*}"
RUN="${LDSO#ld-}"; RUN="run-${RUN%%.so*}.sh"
REL="$(_relpath "$DIR/lib" "$BIN")"
_mv "$BIN" "$RUNDIR/.${BIN##*/}.bin"
cat <<-EOF > "$BIN"
#!/usr/bin/env bash
dir="\$(dirname "\$0")"
export RUNAS_ARG0="\$0"
export LD_PRELOAD="\${LD_PRELOAD:+\$LD_PRELOAD:}\$dir/${REL:+$REL/}runas.so"
exec "\$dir/${REL:+$REL/}$LDSO" --library-path "\$dir/${REL:+$REL/}" "\$dir/.${BIN##*/}.bin" "\$@"
EOF
chmod ${VERBOSE:+-v} 0755 "$BIN"
fi
done
|
