diff options
Diffstat (limited to 'lddsafe')
| -rwxr-xr-x | lddsafe | 158 |
1 files changed, 158 insertions, 0 deletions
@@ -0,0 +1,158 @@ +#!/usr/bin/env bash +# +# lddsafe - Safely print shared library dependencies (similar to ldd). +# Author: Ricardo Garcia Gonzalez. +# Author: Ivan Mironov. +# License: Public domain code. +# + +# Better for grep and expected output of other tools. +export LANG=C + +# Expand globs to nothing when no match is found. +shopt -s nullglob + +# Print error and exit. +die() +{ + echo "ERROR: $1" 1>&2 + exit 1 +} + +# Find required program. +findexec() +{ + which "$1" >/dev/null 2>/dev/null || die "$1 not found" +} + +# Check file exists and is readable. +checkreadable() +{ + [ -r "$1" ] || die "$1 missing or not readable" +} + +# Check for bash version. +[ -n "$BASH_VERSION" ] || die "Bash required" +[ ${BASH_VERSINFO[0]} -ge 4 ] || die "Bash version 4 or later required" + +# Check needed programs. +findexec objdump +findexec readelf +findexec dirname +findexec sed + +# Check needed files. +checkreadable /etc/ld.so.conf + +# Check arguments. +[ "$1" == "-n" ] && recursive=0 || recursive=1 +[ "$1" == "-n" ] && shift +if [ $# -eq 0 ]; then + echo "Usage: $( basename $0 ) [-n] FILE..." 2>&1 + exit 1 +fi +for arg in "$@"; do + checkreadable "$1" +done + +# Recursively print the list of files included from /etc/ld.so.conf. +ld_so_conf_deps() +{ + echo "$1" + dirname="$( dirname "$1" )" + patterns="$( sed -n 's/^include[\ \t]\+\(.\+\)$/\1/p' "$1" )" + set -o noglob + for pattern in $patterns; do + set +o noglob + case $pattern in + /*) + for file in $pattern; do + ld_so_conf_deps "$file" + done + ;; + *) + for file in $dirname/$pattern; do + ld_so_conf_deps "$file" + done + ;; + esac + done + set +o noglob +} + +# Additional library directories. +LD_LIBRARY_PATH_LIBS="${LD_LIBRARY_PATH//:/ }" +MORELIBDIRS="$( sed '/^include[\ \t]/d' $( ld_so_conf_deps /etc/ld.so.conf ) )" + +# Search for a given library name. +searchlib() +{ + found=0 + for libdir in $LIBDIRS; do + path="$libdir"/"$1" + if [ -r "$path" ]; then + found=1 + break + fi + done + [ $found -eq 1 ] && echo "$path" +} + +# Already visited libraries. +declare -A VISITEDLIBS + +# Print dependency results, recursively. +recursivedeps() +{ + for lib in $( objdump -p "$1" | \ + sed -n 's,^ *NEEDED \+\([^ ]\+\) *$,\1,p' ); do + if [ ! "${VISITEDLIBS[$lib]}" ]; then + VISITEDLIBS["$lib"]=1 + file=`searchlib "$lib"` + if [ "$file" ]; then + echo " $lib => $file" + [ $recursive -eq 1 ] && recursivedeps "$file" + else + echo " $lib => not found" + fi + fi + done +} + +# Search symbol names in library directories. +for arg in "$@"; do + # Print file name when more than one file given. + [ $# -gt 1 ] && echo "${arg}:" + + # Set appropriate library search directories. + class=$( readelf -h $arg 2>/dev/null | \ + sed -n 's/^[ \t]*Class:[\ \t]\+\(.\+\)/\1/p' ) + if [ -z "$class" ]; then + echo "$arg: not an ELF file" 2>&1 + continue + fi + if [ $class != ELF32 -a $class != ELF64 ]; then + echo "$arg: unknown ELF format" 2>&1 + continue + fi + if [ $class == ELF64 ]; then + if [ -d /lib64 ]; then + stdlibs="/lib64 /usr/lib64" + else + stdlibs="/lib /usr/lib" + fi + else # $class == ELF32 + if [ -d /lib32 ]; then + stdlibs="/lib32 /usr/lib32" + else + stdlibs="/lib /usr/lib" + fi + fi + LIBDIRS="$LD_LIBRARY_PATH_LIBS $MORELIBDIRS $stdlibs" + + # Get a unique list of library dependencies for this argument. + unset VISITEDLIBS + declare -A VISITEDLIBS + recursivedeps "$arg" +done +exit 0 |