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135 lines
3.2 KiB
135 lines
3.2 KiB
#!/bin/sh |
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# $FreeBSD$ |
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libkey() { |
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libkey="lib_symbols_$1" |
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patterns=[.+,/-] |
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replacement=_ |
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while :; do |
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case " ${libkey} " in |
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*${patterns}*) |
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libkey="${libkey%%${patterns}*}${replacement}${libkey#*${patterns}}" |
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;; |
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*) |
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break |
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;; |
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esac |
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done |
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return 0 |
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} |
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usage() { |
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cat <<-EOF |
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usage: $0 [-Uv] [-L LD_LIBRARY_PATH] file |
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-L: Specify an alternative LD_LIBRARY_PATH for the library resolution. |
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-U: Skip looking for unresolved symbols. |
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-v: Show which library each symbol is resolved to. |
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EOF |
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exit 0 |
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} |
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ret=0 |
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CHECK_UNRESOLVED=1 |
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VERBOSE_RESOLVED=0 |
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while getopts "L:Uv" flag; do |
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case "${flag}" in |
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L) LIB_PATH="${OPTARG}" ;; |
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U) CHECK_UNRESOLVED=0 ;; |
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v) VERBOSE_RESOLVED=1 ;; |
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*) usage ;; |
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esac |
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done |
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shift $((OPTIND-1)) |
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if ! [ -f "$1" ]; then |
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echo "No such file or directory: $1" >&2 |
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exit 1 |
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fi |
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mime=$(file -L --mime-type $1) |
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isbin=0 |
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case $mime in |
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*application/x-executable|*application/x-pie-executable) isbin=1 ;; |
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*application/x-sharedlib);; |
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*) echo "Not an elf file" >&2 ; exit 1;; |
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esac |
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# Gather all symbols from the target |
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unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ') |
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[ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ') |
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if [ -n "${LIB_PATH}" ]; then |
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for libc in /lib/libc.so.*; do |
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LDD_ENV="LD_PRELOAD=${libc}" |
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done |
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LDD_ENV="${LDD_ENV} LD_LIBRARY_PATH=${LIB_PATH}" |
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fi |
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ldd_libs=$(env ${LDD_ENV} ldd $(realpath $1) | awk '{print $1 ":" $3}') |
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# Check for useful libs |
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list_libs= |
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resolved_symbols= |
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for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do |
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echo -n "checking if $lib is needed: " |
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if [ -n "${lib##/*}" ]; then |
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for libpair in ${ldd_libs}; do |
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case "${libpair}" in |
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${lib}:*) libpath="${libpair#*:}" && break ;; |
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esac |
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done |
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else |
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libpath="${lib}" |
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fi |
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list_libs="$list_libs $lib" |
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foundone= |
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lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" |
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if [ ${CHECK_UNRESOLVED} -eq 1 ]; then |
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# Save the global symbols for this lib |
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libkey "${lib}" |
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setvar "${libkey}" "${lib_symbols}" |
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fi |
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for fct in ${lib_symbols}; do |
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case " ${unresolved_symbols} ${bss_symbols} " in |
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*\ ${fct}\ *) foundone="${fct}" && break ;; |
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esac |
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done |
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if [ -n "${foundone}" ]; then |
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echo "yes... ${foundone}" |
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else |
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echo "no" |
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ret=1 |
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fi |
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done |
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if [ ${CHECK_UNRESOLVED} -eq 1 ]; then |
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# Add in crt1 symbols |
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list_libs="${list_libs} crt1.o" |
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lib_symbols="$(nm --defined-only --format=posix "/usr/lib/crt1.o" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')" |
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# Save the global symbols for this lib |
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libkey "crt1.o" |
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setvar "${libkey}" "${lib_symbols}" |
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# Now search libs for all symbols and report missing ones. |
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for sym in ${unresolved_symbols}; do |
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found=0 |
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for lib in ${list_libs}; do |
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libkey "${lib}" |
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eval "lib_symbols=\"\${${libkey}}\"" |
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# lib_symbols now contains symbols for the lib. |
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case " ${lib_symbols} " in |
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*\ ${sym}\ *) |
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[ ${VERBOSE_RESOLVED} -eq 1 ] && |
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echo "Resolved symbol ${sym} from ${lib}" |
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found=1 |
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break |
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;; |
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esac |
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done |
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if [ $found -eq 0 ]; then |
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echo "Unresolved symbol $sym" |
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ret=1 |
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fi |
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done |
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fi |
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exit ${ret}
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