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#!/bin/bash
# Copyright 2007-2013 Gentoo Foundation
# Copyright 2007-2013 Mike Frysinger <vapier@gentoo.org>
# Distributed under the terms of the GNU General Public License v2
argv0=${0##*/}
: ${ROOT:=/}
[[ ${ROOT} != */ ]] && ROOT="${ROOT}/"
[[ ${ROOT} != /* ]] && ROOT="${PWD}${ROOT}"
usage() {
cat <<-EOF
Display ELF dependencies as a tree
Usage: ${argv0} [options] <ELF file[s]>
Options:
-a Show all duplicated dependencies
-x Run with debugging
-R <root> Use this ROOT filesystem tree
--no-auto-root Do not automatically prefix input ELFs with ROOT
-l Display output in a flat format
-h Show this help output
-V Show version information
EOF
exit ${1:-0}
}
version() {
exec echo "lddtree by Mike Frysinger <vapier@gentoo.org>"
}
error() {
echo "${argv0}: $*" 1>&2
ret=1
return 1
}
elf_specs() {
# With glibc, the NONE, SYSV, GNU, and LINUX OSABI's are compatible.
# LINUX and GNU are the same thing, as are NONE and SYSV, so normalize
# GNU & LINUX to NONE. #442024 #464380
scanelf -BF '#F%a %M %D %I' "$1" | \
sed -E 's: (LINUX|GNU)$: NONE:'
}
lib_paths_fallback="${ROOT}lib* ${ROOT}usr/lib* ${ROOT}usr/local/lib*"
c_ldso_paths_loaded='false'
find_elf() {
_find_elf=''
local elf=$1 needed_by=$2
if [[ ${elf} == */* ]] && [[ -e ${elf} ]] ; then
_find_elf=${elf}
return 0
else
check_paths() {
local elf=$1 ; shift
local path pe
for path ; do
pe="${path%/}/${elf#/}"
if [[ -e ${pe} ]] ; then
if [[ $(elf_specs "${pe}") == "${elf_specs}" ]] ; then
_find_elf=${pe}
return 0
fi
fi
done
return 1
}
if [[ ${c_last_needed_by} != ${needed_by} ]] ; then
c_last_needed_by=${needed_by}
c_last_needed_by_rpaths=$(scanelf -qF '#F%r' "${needed_by}" | \
sed -e 's|:| |g' -e "s:[$]ORIGIN:${needed_by%/*}:")
fi
check_paths "${elf}" ${c_last_needed_by_rpaths} && return 0
if [[ -n ${LD_LIBRARY_PATH} ]] ; then
# Need to handle empty paths as $PWD,
# and handle spaces in between the colons
local p path=${LD_LIBRARY_PATH}
while : ; do
p=${path%%:*}
check_paths "${elf}" "${p:-${PWD}}" && return 0
[[ ${path} == *:* ]] || break
path=${path#*:}
done
fi
if ! ${c_ldso_paths_loaded} ; then
c_ldso_paths_loaded='true'
c_ldso_paths=()
if [[ -r ${ROOT}etc/ld.so.conf ]] ; then
read_ldso_conf() {
local line p
for p ; do
# if the glob didnt match anything #360041,
# or the files arent readable, skip it
[[ -r ${p} ]] || continue
while read line ; do
case ${line} in
"#"*) ;;
"include "*) read_ldso_conf ${line#* } ;;
*) c_ldso_paths+=( "${ROOT}${line#/}" ) ;;
esac
done <"${p}"
done
}
# the 'include' command is relative
pushd "${ROOT}"etc >/dev/null
read_ldso_conf "${ROOT}"etc/ld.so.conf
popd >/dev/null
fi
fi
if [[ ${#c_ldso_paths[@]} -gt 0 ]] ; then
check_paths "${elf}" "${c_ldso_paths[@]}" && return 0
fi
check_paths "${elf}" ${lib_paths_ldso:-${lib_paths_fallback}} && return 0
fi
return 1
}
show_elf() {
local elf=$1 indent=$2 parent_elfs=$3
local rlib lib libs
local resolved
find_elf "${elf}"
resolved=${_find_elf}
elf=${elf##*/}
${LIST} || printf "%${indent}s%s => " "" "${elf}"
if [[ ,${parent_elfs}, == *,${elf},* ]] ; then
${LIST} || printf "!!! circular loop !!!\n" ""
return
fi
parent_elfs="${parent_elfs},${elf}"
if ${LIST} ; then
echo "${resolved:-$1}"
else
printf "${resolved:-not found}"
fi
if [[ ${indent} -eq 0 ]] ; then
local elf_specs interp full_interp
elf_specs=$(elf_specs "${resolved}")
interp=$(scanelf -qF '#F%i' "${resolved}")
[[ -n ${interp} ]] && interp="${ROOT}${interp#/}"
if ${LIST} ; then
[[ -n ${interp} ]] && echo "${interp}"
else
printf " (interpreter => ${interp:-none})"
fi
if [[ -r ${interp} ]] ; then
# Extract the default lib paths out of the ldso.
lib_paths_ldso=$(
strings "${interp}" | \
sed -nr -e "/^\/.*lib/{s|^/?|${ROOT}|;s|/$||;s|/?:/?|\n${ROOT}|g;p}"
)
fi
full_interp=${interp}
interp=${interp##*/}
# If we are in non-list mode, then we want to show the "duplicate" interp
# lines -- first the header (interp=>xxx), and then the DT_NEEDED line to
# show that the ELF is directly linked against the interp.
# If we're in list mode though, we only want to show the interp once.
${LIST} && allhits+=",${interp}"
fi
${LIST} || printf "\n"
[[ -z ${resolved} ]] && return
libs=$(scanelf -qF '#F%n' "${resolved}")
local my_allhits
if ! ${SHOW_ALL} ; then
my_allhits="${allhits}"
allhits+=",${libs}"
fi
for lib in ${libs//,/ } ; do
lib=${lib##*/}
# No need for leading comma w/my_allhits as we guarantee it always
# starts with one due to the way we append the value above.
[[ ${my_allhits}, == *,${lib},* ]] && continue
# If the interp is being linked against directly, re-use the existing
# full path rather than perform a search for it. When systems symlink
# the interp to a diff location, we might locate a different path, and
# displaying both doesn't make sense as it doesn't match the runtime --
# the ldso won't load another copy of ldso into memory from the search
# path, it'll re-use the existing copy that was loaded from the full
# hardcoded path.
if [[ ${lib} == "${interp}" ]] ; then
rlib=${full_interp}
else
find_elf "${lib}" "${resolved}"
rlib=${_find_elf}
fi
show_elf "${rlib:-${lib}}" $((indent + 4)) "${parent_elfs}"
done
}
# XXX: internal hack
if [[ $1 != "/../..source.lddtree" ]] ; then
SHOW_ALL=false
SET_X=false
LIST=false
AUTO_ROOT=true
while getopts haxVR:l-: OPT ; do
case ${OPT} in
a) SHOW_ALL=true;;
x) SET_X=true;;
h) usage;;
V) version;;
R) ROOT="${OPTARG%/}/";;
l) LIST=true;;
-) # Long opts ftw.
case ${OPTARG} in
no-auto-root) AUTO_ROOT=false;;
*) usage 1;;
esac
;;
?) usage 1;;
esac
done
shift $((OPTIND - 1))
[[ -z $1 ]] && usage 1
${SET_X} && set -x
ret=0
for elf ; do
unset lib_paths_ldso
unset c_last_needed_by
if ${AUTO_ROOT} && [[ ${elf} == /* ]] ; then
elf="${ROOT}${elf#/}"
fi
if [[ ! -e ${elf} ]] ; then
error "${elf}: file does not exist"
elif [[ ! -r ${elf} ]] ; then
error "${elf}: file is not readable"
elif [[ -d ${elf} ]] ; then
error "${elf}: is a directory"
else
allhits=""
[[ ${elf} != */* ]] && elf="./${elf}"
show_elf "${elf}" 0 ""
fi
done
exit ${ret}
fi