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#*${patterns}}" 12 ;; 13 *) 14 break 15 ;; 16 esac 17 done 18 return 0 19} 20 21ret=0 22CHECK_UNRESOLVED=1 23while getopts "U" flag; do 24 case "${flag}" in 25 U) CHECK_UNRESOLVED=0 ;; 26 esac 27done 28shift $((OPTIND-1)) 29 30mime=$(file -L --mime-type $1) 31isbin=0 32case $mime in 33*application/x-executable) isbin=1 ;; 34*application/x-sharedlib);; 35*) echo "Not an elf file" >&2 ; exit 1;; 36esac 37 38# Gather all symbols from the target 39unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ') 40[ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ') 41ldd_libs=$(ldd $(realpath $1) | awk '{print $1 ":" $3}') 42 43# Check for useful libs 44list_libs= 45resolved_symbols= 46for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do 47 echo -n "checking if $lib is needed: " 48 if [ -n "${lib##/*}" ]; then 49 for libpair in ${ldd_libs}; do 50 case "${libpair}" in 51 ${lib}:*) libpath="${libpair#*:}" && break ;; 52 esac 53 done 54 else 55 libpath="${lib}" 56 fi 57 list_libs="$list_libs $lib" 58 foundone= 59 lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" 60 if [ ${CHECK_UNRESOLVED} -eq 1 ]; then 61 # Save the global symbols for this lib 62 libkey "${lib}" 63 setvar "${libkey}" "${lib_symbols}" 64 fi 65 for fct in ${lib_symbols}; do 66 case " ${unresolved_symbols} ${bss_symbols} " in 67 *\ ${fct}\ *) foundone="${fct}" && break ;; 68 esac 69 done 70 if [ -n "${foundone}" ]; then 71 echo "yes... ${foundone}" 72 else 73 echo "no" 74 ret=1 75 fi 76done 77 78if [ ${CHECK_UNRESOLVED} -eq 1 ]; then 79 # Add in crt1 symbols 80 list_libs="${list_libs} crt1.o" 81 lib_symbols="$(nm --defined-only --format=posix "/usr/lib/crt1.o" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" 82 # Save the global symbols for this lib 83 libkey "crt1.o" 84 setvar "${libkey}" "${lib_symbols}" 85 86 # No search libs for all symbols and report missing ones. 87 for sym in ${unresolved_symbols}; do 88 found=0 89 for lib in ${list_libs}; do 90 libkey "${lib}" 91 eval "lib_symbols=\"\${${libkey}}\"" 92 # lib_symbols now contains symbols for the lib. 93 case " ${lib_symbols} " in 94 *\ ${sym}\ *) found=1 && break ;; 95 esac 96 done 97 if [ $found -eq 0 ]; then 98 echo "Unresolved symbol $sym" 99 ret=1 100 fi 101 done 102fi 103 104exit ${ret} 105