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#*${patterns}}" 12 ;; 13 *) 14 break 15 ;; 16 esac 17 done 18 return 0 19} 20 21ret=0 22CHECK_UNRESOLVED=1 23VERBOSE_RESOLVED=0 24while getopts "Uv" flag; do 25 case "${flag}" in 26 U) CHECK_UNRESOLVED=0 ;; 27 v) VERBOSE_RESOLVED=1 ;; 28 esac 29done 30shift $((OPTIND-1)) 31 32mime=$(file -L --mime-type $1) 33isbin=0 34case $mime in 35*application/x-executable) isbin=1 ;; 36*application/x-sharedlib);; 37*) echo "Not an elf file" >&2 ; exit 1;; 38esac 39 40# Gather all symbols from the target 41unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ') 42[ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ') 43ldd_libs=$(ldd $(realpath $1) | awk '{print $1 ":" $3}') 44 45# Check for useful libs 46list_libs= 47resolved_symbols= 48for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do 49 echo -n "checking if $lib is needed: " 50 if [ -n "${lib##/*}" ]; then 51 for libpair in ${ldd_libs}; do 52 case "${libpair}" in 53 ${lib}:*) libpath="${libpair#*:}" && break ;; 54 esac 55 done 56 else 57 libpath="${lib}" 58 fi 59 list_libs="$list_libs $lib" 60 foundone= 61 lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" 62 if [ ${CHECK_UNRESOLVED} -eq 1 ]; then 63 # Save the global symbols for this lib 64 libkey "${lib}" 65 setvar "${libkey}" "${lib_symbols}" 66 fi 67 for fct in ${lib_symbols}; do 68 case " ${unresolved_symbols} ${bss_symbols} " in 69 *\ ${fct}\ *) foundone="${fct}" && break ;; 70 esac 71 done 72 if [ -n "${foundone}" ]; then 73 echo "yes... ${foundone}" 74 else 75 echo "no" 76 ret=1 77 fi 78done 79 80if [ ${CHECK_UNRESOLVED} -eq 1 ]; then 81 # Add in crt1 symbols 82 list_libs="${list_libs} crt1.o" 83 lib_symbols="$(nm --defined-only --format=posix "/usr/lib/crt1.o" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" 84 # Save the global symbols for this lib 85 libkey "crt1.o" 86 setvar "${libkey}" "${lib_symbols}" 87 88 # Now search libs for all symbols and report missing ones. 89 for sym in ${unresolved_symbols}; do 90 found=0 91 for lib in ${list_libs}; do 92 libkey "${lib}" 93 eval "lib_symbols=\"\${${libkey}}\"" 94 # lib_symbols now contains symbols for the lib. 95 case " ${lib_symbols} " in 96 *\ ${sym}\ *) 97 [ ${VERBOSE_RESOLVED} -eq 1 ] && 98 echo "Resolved symbol ${sym} from ${lib}" 99 found=1 100 break 101 ;; 102 esac 103 done 104 if [ $found -eq 0 ]; then 105 echo "Unresolved symbol $sym" 106 ret=1 107 fi 108 done 109fi 110 111exit ${ret} 112