Add unpack mode
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README.md
67
README.md
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`packelf` was inspired by [the idea of Klaus D](https://askubuntu.com/a/546305). It is used to package the elf executable and its dependent libraries into a single executable.
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`packelf` was inspired by [the idea of Klaus D](https://askubuntu.com/a/546305). It is used to pack a ELF program and its dependent libraries into a single executable file.
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## usage
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```
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packelf.sh <ELF_SRC_PATH> <DST_PATH> [ADDITIONAL_LIBS ...]
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Usage: ./packelf.sh [-zjJn] <ELF_SRC_PATH> <DST_PATH> [ADDITIONAL_LIBS ...]
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-zjJ compress flag passed to tar, '-z' by default
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-n pack without compress
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```
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## example
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First, pack a ELF program. For example, you can pack `ls` like this:
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```
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~ # packelf.sh `which perf` /root/perf
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~ # /root/perf --version
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perf version 3.10.0-1160.49.1.el7.x86_64.debug
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# ./packelf.sh /bin/ls /root/ls
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tar: Removing leading `/' from member names
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'/bin/ls' was packed to '/root/ls'
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Just run '/root/ls ARGS...' to execute the command.
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Or run 'PACKELF_UNPACK_DIR=xxx /root/ls' to unpack it only.
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```
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You can execute the packed program directly:
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```
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# /root/ls -lh /root/ls
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-rwxr-xr-x 1 root root 1.3M May 21 08:35 /root/ls
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```
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However, every time the packed program is executed, an internal unpacking operation is performed automatically, which results in a slower startup of the program.
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If you need to execute the program many times and want to reduce the startup time, you can unpack the program before executing it.
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```
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# Run the packed program directly, it takes longer.
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~ # time bash -c 'for i in {1..100};do /root/ls >/dev/null; done'
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real 0m4.203s
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user 0m2.067s
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sys 0m3.093s
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# You can unpack it first.
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~ # PACKELF_UNPACK_DIR=/usr/local/bin /root/ls
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'ls' was unpacked to '/usr/local/bin'.
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You can run '/usr/local/bin/ls ARGS...' to execute the command.
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# ls and ls.res are generated after unpacking.
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~ # /usr/local/bin/ls -lh /usr/local/bin/ls*
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-rwxr-xr-x 1 root root 3.9K May 21 09:00 /usr/local/bin/ls
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/usr/local/bin/ls.res:
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total 3.0M
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-rwxr-xr-x 1 root root 175K May 21 09:00 ld-linux-x86-64.so.2
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-rwxr-xr-x 1 root root 2.0M May 3 2022 libc.so.6
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-rw-r--r-- 1 root root 15K May 3 2022 libdl.so.2
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-rw-r--r-- 1 root root 454K Feb 3 2018 libpcre.so.3
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-rwxr-xr-x 1 root root 142K May 3 2022 libpthread.so.0
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-rw-r--r-- 1 root root 152K Mar 1 2018 libselinux.so.1
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-rwxr-xr-x 1 root root 131K Jan 18 2018 ls
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# Running the unpacked launch script (/usr/local/bin/ls) will take much less time.
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~ # time bash -c 'for i in {1..100};do /usr/local/bin/ls >/dev/null; done'
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real 0m0.370s
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user 0m0.239s
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sys 0m0.133s
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```
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## dependence
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* sh
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* tar
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Note: If your tar doesn't support gzip, '-n' is needed when you pack a program.
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156
packelf.sh
156
packelf.sh
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@ -1,14 +1,64 @@
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#!/bin/bash
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set -eo pipefail
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#!/usr/bin/env sh
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#set -o pipefail # bash extension
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set -e
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[ $# -lt 2 ] && {
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echo "usage: $0 <ELF_SRC_PATH> <DST_PATH> [ADDITIONAL_LIBS ...]"
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# These vars will be modified automatically with sed
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run_mode=packer
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compress_flag=-z
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program=
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ld_so=
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load() {
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script_path="$0"
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while link_path=$(readlink "$script_path"); do
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script_path="$link_path"
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done
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unpack_dir=$(dirname "$script_path")
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exec "$unpack_dir/$program.res/$ld_so" \
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--library-path "$unpack_dir/$program.res" \
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"$unpack_dir/$program.res/$program" "$@"
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# unreachable
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}
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if [ "$run_mode" = loader ]; then
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load "$@"
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fi
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pack_help() {
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echo "Usage: $0 [-zjJn] <ELF_SRC_PATH> <DST_PATH> [ADDITIONAL_LIBS ...]"
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echo " -zjJ compress flag passed to tar, '-z' by default"
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echo " -n pack without compress"
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}
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pack() {
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[ $# -ge 2 ] || {
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pack_help
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exit 1
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}
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src="$1"
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dst="$2"
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case $1 in
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-z|-j|-J)
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compress_flag=$1
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shift
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;;
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-n)
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compress_flag=''
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shift
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;;
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-h|--help)
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pack_help
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exit 0
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;;
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*)
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;;
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esac
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src="$1"
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shift
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dst="$1"
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shift
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libs="$(ldd "$src" | grep -F '/' | sed -E 's|[^/]*/([^ ]+).*?|/\1|')"
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@ -16,21 +66,83 @@ ld_so="$(echo "$libs" | grep -F '/ld-linux-')"
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ld_so="$(basename "$ld_so")"
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program="$(basename "$src")"
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cat >"$dst" <<EOF
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#!/bin/bash
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tmp_dir="\$(mktemp -d)"
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check_path="\$tmp_dir/__check_permission__"
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trap 'rm -rf \$tmp_dir' 0 1 2 3 6
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if ! (touch "\$check_path" && chmod +x "\$check_path" && [ -x "\$check_path" ]); then
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rm -rf "\$tmp_dir"
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tmp_dir="\$(TMPDIR="\$(pwd)" mktemp -d)"
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fi
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sed '1,/^#__END__$/d' "\$0" | tar -xz -C "\$tmp_dir"
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sed -i 's@/etc/ld.so.preload@/etc/___so.preload@g' "\$tmp_dir/$ld_so"
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"\$tmp_dir/$ld_so" --library-path "\$tmp_dir" "\$tmp_dir/$program" "\$@"
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exit \$?
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#__END__
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EOF
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cat "$0" | sed -E \
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-e 's/^run_mode=[^ ]*$/run_mode=unpacker/' \
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-e 's/^compress_flag=[^ ]*$/compress_flag='"$compress_flag"'/' \
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-e 's/^program=[^ ]*$/program='"$program"'/' \
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-e 's/^ld_so=[^ ]*$/ld_so='"$ld_so"'/' \
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>"$dst"
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tar $compress_flag -ch \
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--transform 's/.*\//'"$program"'.res\//' \
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"$src" $libs "$@" \
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>>"$dst" #\
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#2> >(grep -v 'Removing leading' >&2) # bash extension
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tar -czh --transform 's/.*\///g' "$src" $libs "$@" >>"$dst" 2> >(grep -v 'Removing leading' >&2)
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chmod +x "$dst"
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echo "'$src' was packed to '$dst'"
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echo "$dst" | grep -q / || dst="./$dst"
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echo "Just run '$dst ARGS...' to execute the command."
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echo "Or run 'PACKELF_UNPACK_DIR=xxx $dst' to unpack it only."
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}
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unpack() {
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if [ -n "$PACKELF_UNPACK_DIR" ]; then
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[ -d "$PACKELF_UNPACK_DIR" ] || {
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echo "'$PACKELF_UNPACK_DIR' is not a dir."
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exit 1
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}
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[ -e "$PACKELF_UNPACK_DIR/$program" ] && {
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echo "'$PACKELF_UNPACK_DIR/$program' already exists, please remove it first."
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exit 1
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}
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unpack_dir="$PACKELF_UNPACK_DIR"
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else
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if [ -n "$PACKELF_TMP_DIR" ]; then
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unpack_dir="$PACKELF_TMP_DIR"
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else
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tmp_parent=/tmp/packelf_tmp
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mkdir -p "$tmp_parent"
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unpack_dir=$(mktemp -d -p "$tmp_parent" || echo "$tmp_parent")
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fi
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trap 'rm -rf "$unpack_dir"' 0 1 2 3 6 10 12 13 14 15
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fi
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check_path="$unpack_dir/__check_permission__"
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if ! (echo > "$check_path" && chmod +x "$check_path" && [ -x "$check_path" ]); then
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rm -rf "$unpack_dir"
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tmp_parent="$(pwd)/packelf_tmp"
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mkdir -p "$tmp_parent"
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unpack_dir="$(mktemp -d -p "$tmp_parent" || echo "$tmp_parent")"
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fi
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sed '1,/^#__END__$/d' "$0" | tar $compress_flag -x -C "$unpack_dir"
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sed -i 's@/etc/ld.so.preload@/etc/___so.preload@g' "$unpack_dir/$program.res/$ld_so"
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if [ -n "$PACKELF_UNPACK_DIR" ]; then
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sed '/^#__END__$/,$d' "$0" > "$unpack_dir/$program"
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sed -i -E 's/^run_mode=\w*$/run_mode=loader/' "$unpack_dir/$program"
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chmod +x "$unpack_dir/$program"
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echo "'$program' was unpacked to '$unpack_dir'."
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echo "$unpack_dir" | grep -q / || unpack_dir="./$unpack_dir"
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echo "You can run '$unpack_dir/$program ARGS...' to execute the command."
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else
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"$unpack_dir/$program.res/$ld_so" \
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--library-path "$unpack_dir/$program.res" \
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"$unpack_dir/$program.res/$program" "$@"
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exit $?
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fi
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}
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if [ "$run_mode" = unpacker ]; then
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unpack "$@"
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else
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pack "$@"
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fi
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exit 0
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#__END__
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