Fix typo.
[glibc/history.git] / elf / readlib.c
bloba1fec9458937e2722472bad702db56fed798a19a
1 /* Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
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 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
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. */
26 #include <a.out.h>
27 #include <elf.h>
28 #include <error.h>
29 #include <libintl.h>
30 #include <link.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <unistd.h>
34 #include <sys/mman.h>
35 #include <sys/param.h>
36 #include <sys/stat.h>
37 #include <gnu/lib-names.h>
39 #include "ldconfig.h"
41 #define Elf32_CLASS ELFCLASS32
42 #define Elf64_CLASS ELFCLASS64
44 struct known_names
46 const char *soname;
47 int flag;
50 static struct known_names interpreters[] =
52 { "/lib/" LD_SO, FLAG_ELF_LIBC6 },
53 #ifdef SYSDEP_KNOWN_INTERPRETER_NAMES
54 SYSDEP_KNOWN_INTERPRETER_NAMES
55 #endif
58 static struct known_names known_libs[] =
60 { LIBC_SO, FLAG_ELF_LIBC6 },
61 { LIBM_SO, FLAG_ELF_LIBC6 },
62 #ifdef SYSDEP_KNOWN_LIBRARY_NAMES
63 SYSDEP_KNOWN_LIBRARY_NAMES
64 #endif
69 /* Returns 0 if everything is ok, != 0 in case of error. */
70 int
71 process_file (const char *real_file_name, const char *file_name,
72 const char *lib, int *flag, unsigned int *osversion,
73 char **soname, int is_link)
75 FILE *file;
76 struct stat64 statbuf;
77 void *file_contents;
78 int ret;
79 ElfW(Ehdr) *elf_header;
80 struct exec *aout_header;
82 ret = 0;
83 *flag = FLAG_ANY;
84 *soname = NULL;
86 file = fopen (real_file_name, "rb");
87 if (file == NULL)
89 /* No error for stale symlink. */
90 if (is_link && strstr (file_name, ".so") != NULL)
91 return 1;
92 error (0, 0, _("Input file %s not found.\n"), file_name);
93 return 1;
96 if (fstat64 (fileno (file), &statbuf) < 0)
98 error (0, 0, _("Cannot fstat file %s.\n"), file_name);
99 fclose (file);
100 return 1;
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 ((size_t) statbuf.st_size < sizeof (struct exec)
106 || (size_t) statbuf.st_size < sizeof (ElfW(Ehdr)))
108 error (0, 0, _("File %s is too small, not checked."), file_name);
109 fclose (file);
110 return 1;
113 file_contents = mmap (0, statbuf.st_size, PROT_READ, MAP_SHARED,
114 fileno (file), 0);
115 if (file_contents == MAP_FAILED)
117 error (0, 0, _("Cannot mmap file %s.\n"), file_name);
118 fclose (file);
119 return 1;
122 /* First check if this is an aout file. */
123 aout_header = (struct exec *) file_contents;
124 if (N_MAGIC (*aout_header) == ZMAGIC
125 #ifdef QMAGIC /* Linuxism. */
126 || N_MAGIC (*aout_header) == QMAGIC
127 #endif
130 /* Aout files don't have a soname, just return the name
131 including the major number. */
132 char *copy, *major, *dot;
133 copy = xstrdup (lib);
134 major = strstr (copy, ".so.");
135 if (major)
137 dot = strstr (major + 4, ".");
138 if (dot)
139 *dot = '\0';
141 *soname = copy;
142 *flag = FLAG_LIBC4;
143 goto done;
146 elf_header = (ElfW(Ehdr) *) file_contents;
147 if (memcmp (elf_header->e_ident, ELFMAG, SELFMAG) != 0)
149 /* The file is neither ELF nor aout. Check if it's a linker
150 script, like libc.so - otherwise complain. Only search the
151 beginning of the file. */
152 size_t len = MIN (statbuf.st_size, 512);
153 if (memmem (file_contents, len, "GROUP", 5) == NULL
154 && memmem (file_contents, len, "GNU ld script", 13) == NULL)
155 error (0, 0, _("%s is not an ELF file - it has the wrong magic bytes at the start.\n"),
156 file_name);
157 ret = 1;
159 /* Libraries have to be shared object files. */
160 else if (elf_header->e_type != ET_DYN)
161 ret = 1;
162 else if (process_elf_file (file_name, lib, flag, osversion, soname,
163 file_contents, statbuf.st_size))
164 ret = 1;
166 done:
167 /* Clean up allocated memory and resources. */
168 munmap (file_contents, statbuf.st_size);
169 fclose (file);
171 return ret;
174 /* Get architecture specific version of process_elf_file. */
175 #include "readelflib.c"