]>
Commit | Line | Data |
---|---|---|
e7c036b3 | 1 | /* Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
591e1ffb UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Andreas Jaeger <aj@suse.de>, 1999 and | |
4 | Jakub Jelinek <jakub@redhat.com>, 1999. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | /* The code in this file and in readelflib is a heavily simplified | |
22 | version of the readelf program that's part of the current binutils | |
23 | development version. Besides the simplification, it has also been | |
24 | modified to read some other file formats. */ | |
25 | ||
26 | ||
591e1ffb UD |
27 | #include <elf.h> |
28 | #include <error.h> | |
29 | #include <link.h> | |
30 | #include <libintl.h> | |
31 | #include <stdio.h> | |
32 | #include <string.h> | |
33 | #include <unistd.h> | |
af1680f1 | 34 | #include <a.out.h> |
591e1ffb UD |
35 | |
36 | #include <sys/mman.h> | |
37 | #include <sys/stat.h> | |
dc95d158 | 38 | #include <gnu/lib-names.h> |
591e1ffb UD |
39 | |
40 | #include "ldconfig.h" | |
41 | ||
42 | #define Elf32_CLASS ELFCLASS32 | |
43 | #define Elf64_CLASS ELFCLASS64 | |
44 | ||
45 | struct known_names | |
46 | { | |
47 | const char *soname; | |
48 | int flag; | |
49 | }; | |
50 | ||
51 | static struct known_names interpreters [] = | |
52 | { | |
9c145d90 | 53 | {"/lib/" LD_SO, FLAG_ELF_LIBC6}, |
591e1ffb UD |
54 | {"/lib/ld-linux.so.1", FLAG_ELF_LIBC5} |
55 | }; | |
56 | ||
57 | static struct known_names known_libs [] = | |
58 | { | |
dc95d158 | 59 | /* Old names: */ |
591e1ffb | 60 | {"libc.so.5", FLAG_ELF_LIBC5}, |
dc95d158 AJ |
61 | {"libm.so.5", FLAG_ELF_LIBC5}, |
62 | /* Current names: */ | |
63 | {LIBC_SO, FLAG_ELF_LIBC6}, | |
64 | {LIBM_SO, FLAG_ELF_LIBC6} | |
591e1ffb UD |
65 | }; |
66 | ||
67 | ||
68 | ||
69 | /* Returns 0 if everything is ok, != 0 in case of error. */ | |
70 | int | |
b4a555d6 UD |
71 | process_file (const char *real_file_name, const char *file_name, |
72 | const char *lib, int *flag, char **soname, int is_link) | |
591e1ffb UD |
73 | { |
74 | FILE *file; | |
b4a555d6 | 75 | struct stat64 statbuf; |
591e1ffb UD |
76 | void *file_contents; |
77 | int ret; | |
af1680f1 | 78 | |
591e1ffb UD |
79 | ElfW(Ehdr) *elf_header; |
80 | struct exec *aout_header; | |
81 | ||
82 | ret = 0; | |
83 | *flag = FLAG_ANY; | |
84 | *soname = NULL; | |
85 | ||
b4a555d6 | 86 | file = fopen (real_file_name, "rb"); |
591e1ffb UD |
87 | if (file == NULL) |
88 | { | |
89 | /* No error for stale symlink. */ | |
7ad9abc0 | 90 | if (is_link && strstr (file_name, ".so") != NULL) |
591e1ffb UD |
91 | return 1; |
92 | error (0, 0, _("Input file %s not found.\n"), file_name); | |
93 | return 1; | |
94 | } | |
95 | ||
b4a555d6 | 96 | if (fstat64 (fileno (file), &statbuf) < 0) |
591e1ffb UD |
97 | { |
98 | error (0, 0, _("Cannot fstat file %s.\n"), file_name); | |
e7c036b3 UD |
99 | fclose (file); |
100 | return 1; | |
101 | } | |
102 | ||
103 | /* Check that the file is large enough so that we can access the | |
104 | information. We're only checking the size of the headers here. */ | |
105 | if (statbuf.st_size < sizeof (struct exec) | |
106 | || statbuf.st_size < sizeof (ElfW(Ehdr))) | |
107 | { | |
108 | error (0, 0, _("File %s is too small, not checked."), file_name); | |
109 | fclose (file); | |
591e1ffb UD |
110 | return 1; |
111 | } | |
112 | ||
e7c036b3 UD |
113 | file_contents = mmap (0, statbuf.st_size, PROT_READ, MAP_SHARED, |
114 | fileno (file), 0); | |
591e1ffb UD |
115 | if (file_contents == MAP_FAILED) |
116 | { | |
117 | error (0, 0, _("Cannot mmap file %s.\n"), file_name); | |
118 | fclose (file); | |
119 | return 1; | |
120 | } | |
121 | ||
122 | /* First check if this is an aout file. */ | |
123 | aout_header = (struct exec *) file_contents; | |
124 | if (N_MAGIC (*aout_header) == ZMAGIC | |
125 | || N_MAGIC (*aout_header) == QMAGIC) | |
126 | { | |
e7c036b3 | 127 | /* Aout files don't have a soname, just return the name |
591e1ffb UD |
128 | including the major number. */ |
129 | char *copy, *major, *dot; | |
130 | copy = xstrdup (lib); | |
131 | major = strstr (copy, ".so."); | |
132 | if (major) | |
133 | { | |
134 | dot = strstr (major + 4, "."); | |
135 | if (dot) | |
136 | *dot = '\0'; | |
137 | } | |
138 | *soname = copy; | |
139 | *flag = FLAG_LIBC4; | |
140 | goto done; | |
141 | } | |
af1680f1 | 142 | |
591e1ffb UD |
143 | elf_header = (ElfW(Ehdr) *) file_contents; |
144 | if (elf_header->e_ident [EI_MAG0] != ELFMAG0 | |
145 | || elf_header->e_ident [EI_MAG1] != ELFMAG1 | |
146 | || elf_header->e_ident [EI_MAG2] != ELFMAG2 | |
147 | || elf_header->e_ident [EI_MAG3] != ELFMAG3) | |
148 | { | |
149 | /* The file is neither ELF nor aout. Check if it's a linker script, | |
150 | like libc.so - otherwise complain. */ | |
151 | int len = statbuf.st_size; | |
152 | /* Only search the beginning of the file. */ | |
153 | if (len > 512) | |
154 | len = 512; | |
155 | if (memmem (file_contents, len, "GROUP", 5) == NULL | |
156 | && memmem (file_contents, len, "GNU ld script", 13) == NULL) | |
157 | error (0, 0, _("%s is not an ELF file - it has the wrong magic bytes at the start.\n"), | |
158 | file_name); | |
159 | ret = 1; | |
160 | goto done; | |
161 | } | |
162 | ||
dc95d158 AJ |
163 | if (process_elf_file (file_name, lib, flag, soname, file_contents, |
164 | statbuf.st_size)) | |
591e1ffb UD |
165 | ret = 1; |
166 | ||
167 | done: | |
168 | /* Clean up allocated memory and resources. */ | |
169 | munmap (file_contents, statbuf.st_size); | |
170 | fclose (file); | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | /* Get architecture specific version of process_elf_file. */ | |
176 | #include "readelflib.c" |