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#!/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
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