blob: 06aa8d31d28e420371b7b2ccb78bc3083f5eeb40 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
#!/bin/sh
# $FreeBSD$
libkey() {
libkey="lib_symbols_$1"
patterns=[.+,/-]
replacement=_
while :; do
case " ${libkey} " in
*${patterns}*)
libkey="${libkey%%${patterns}*}${replacement}${libkey#*${patterns}}"
;;
*)
break
;;
esac
done
return 0
}
usage() {
cat <<-EOF
usage: $0 [-Uv] [-L LD_LIBRARY_PATH] file
-L: Specify an alternative LD_LIBRARY_PATH for the library resolution.
-U: Skip looking for unresolved symbols.
-v: Show which library each symbol is resolved to.
EOF
exit 0
}
ret=0
CHECK_UNRESOLVED=1
VERBOSE_RESOLVED=0
while getopts "L:Uv" flag; do
case "${flag}" in
L) LIB_PATH="${OPTARG}" ;;
U) CHECK_UNRESOLVED=0 ;;
v) VERBOSE_RESOLVED=1 ;;
*) usage ;;
esac
done
shift $((OPTIND-1))
if ! [ -f "$1" ]; then
echo "No such file or directory: $1" >&2
exit 1
fi
mime=$(file -L --mime-type $1)
isbin=0
case $mime in
*application/x-executable) isbin=1 ;;
*application/x-sharedlib);;
*) echo "Not an elf file" >&2 ; exit 1;;
esac
# Gather all symbols from the target
unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ')
[ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ')
if [ -n "${LIB_PATH}" ]; then
for libc in /lib/libc.so.*; do
LDD_ENV="LD_PRELOAD=${libc}"
done
LDD_ENV="${LDD_ENV} LD_LIBRARY_PATH=${LIB_PATH}"
fi
ldd_libs=$(env ${LDD_ENV} ldd $(realpath $1) | awk '{print $1 ":" $3}')
# Check for useful libs
list_libs=
resolved_symbols=
for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do
echo -n "checking if $lib is needed: "
if [ -n "${lib##/*}" ]; then
for libpair in ${ldd_libs}; do
case "${libpair}" in
${lib}:*) libpath="${libpair#*:}" && break ;;
esac
done
else
libpath="${lib}"
fi
list_libs="$list_libs $lib"
foundone=
lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
# Save the global symbols for this lib
libkey "${lib}"
setvar "${libkey}" "${lib_symbols}"
fi
for fct in ${lib_symbols}; do
case " ${unresolved_symbols} ${bss_symbols} " in
*\ ${fct}\ *) foundone="${fct}" && break ;;
esac
done
if [ -n "${foundone}" ]; then
echo "yes... ${foundone}"
else
echo "no"
ret=1
fi
done
if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
# Add in crt1 symbols
list_libs="${list_libs} crt1.o"
lib_symbols="$(nm --defined-only --format=posix "/usr/lib/crt1.o" | awk '$2 ~ /C|R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
# Save the global symbols for this lib
libkey "crt1.o"
setvar "${libkey}" "${lib_symbols}"
# Now search libs for all symbols and report missing ones.
for sym in ${unresolved_symbols}; do
found=0
for lib in ${list_libs}; do
libkey "${lib}"
eval "lib_symbols=\"\${${libkey}}\""
# lib_symbols now contains symbols for the lib.
case " ${lib_symbols} " in
*\ ${sym}\ *)
[ ${VERBOSE_RESOLVED} -eq 1 ] &&
echo "Resolved symbol ${sym} from ${lib}"
found=1
break
;;
esac
done
if [ $found -eq 0 ]; then
echo "Unresolved symbol $sym"
ret=1
fi
done
fi
exit ${ret}
|
