1#!/bin/sh 2# $FreeBSD$ 3 4libkey() { 5 libkey="lib_symbols_$1" 6 patterns=[.+,/-] 7 replacement=_ 8 while :; do 9 case " ${libkey} " in 10 *${patterns}*) 11 libkey="${libkey%%${patterns}*}${replacement}${libkey#*${patterns}}" 12 ;; 13 *) 14 break 15 ;; 16 esac 17 done 18 return 0 19} 20 21usage() { 22 cat <<-EOF 23 usage: $0 [-Uv] [-L LD_LIBRARY_PATH] file 24 -L: Specify an alternative LD_LIBRARY_PATH for the library resolution. 25 -U: Skip looking for unresolved symbols. 26 -v: Show which library each symbol is resolved to. 27 EOF 28 exit 0 29} 30 31ret=0 32CHECK_UNRESOLVED=1 33VERBOSE_RESOLVED=0 34while getopts "L:Uv" flag; do 35 case "${flag}" in 36 L) LIB_PATH="${OPTARG}" ;; 37 U) CHECK_UNRESOLVED=0 ;; 38 v) VERBOSE_RESOLVED=1 ;; 39 *) usage ;; 40 esac 41done 42shift $((OPTIND-1)) 43 44if ! [ -f "$1" ]; then 45 echo "No such file or directory: $1" >&2 46 exit 1 47fi 48 49mime=$(file -L --mime-type $1) 50isbin=0 51case $mime in 52*application/x-executable) isbin=1 ;; 53*application/x-sharedlib);; 54*) echo "Not an elf file" >&2 ; exit 1;; 55esac 56 57# Gather all symbols from the target 58unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ') 59[ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ') 60if [ -n "${LIB_PATH}" ]; then 61 for libc in /lib/libc.so.*; do 62 LDD_ENV="LD_PRELOAD=${libc}" 63 done 64 LDD_ENV="${LDD_ENV} LD_LIBRARY_PATH=${LIB_PATH}" 65fi 66 67ldd_libs=$(env ${LDD_ENV} ldd $(realpath $1) | awk '{print $1 ":" $3}') 68 69# Check for useful libs 70list_libs= 71resolved_symbols= 72for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do 73 echo -n "checking if $lib is needed: " 74 if [ -n "${lib##/*}" ]; then 75 for libpair in ${ldd_libs}; do 76 case "${libpair}" in 77 ${lib}:*) libpath="${libpair#*:}" && break ;; 78 esac 79 done 80 else 81 libpath="${lib}" 82 fi 83 list_libs="$list_libs $lib" 84 foundone= 85 lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" 86 if [ ${CHECK_UNRESOLVED} -eq 1 ]; then 87 # Save the global symbols for this lib 88 libkey "${lib}" 89 setvar "${libkey}" "${lib_symbols}" 90 fi 91 for fct in ${lib_symbols}; do 92 case " ${unresolved_symbols} ${bss_symbols} " in 93 *\ ${fct}\ *) foundone="${fct}" && break ;; 94 esac 95 done 96 if [ -n "${foundone}" ]; then 97 echo "yes... ${foundone}" 98 else 99 echo "no" 100 ret=1 101 fi 102done 103 104if [ ${CHECK_UNRESOLVED} -eq 1 ]; then 105 # Add in crt1 symbols 106 list_libs="${list_libs} crt1.o" 107 lib_symbols="$(nm --defined-only --format=posix "/usr/lib/crt1.o" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" 108 # Save the global symbols for this lib 109 libkey "crt1.o" 110 setvar "${libkey}" "${lib_symbols}" 111 112 # Now search libs for all symbols and report missing ones. 113 for sym in ${unresolved_symbols}; do 114 found=0 115 for lib in ${list_libs}; do 116 libkey "${lib}" 117 eval "lib_symbols=\"\${${libkey}}\"" 118 # lib_symbols now contains symbols for the lib. 119 case " ${lib_symbols} " in 120 *\ ${sym}\ *) 121 [ ${VERBOSE_RESOLVED} -eq 1 ] && 122 echo "Resolved symbol ${sym} from ${lib}" 123 found=1 124 break 125 ;; 126 esac 127 done 128 if [ $found -eq 0 ]; then 129 echo "Unresolved symbol $sym" 130 ret=1 131 fi 132 done 133fi 134 135exit ${ret} 136