diff options
Diffstat (limited to 'elf/readlib.c')
| -rw-r--r-- | elf/readlib.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/elf/readlib.c b/elf/readlib.c new file mode 100644 index 0000000000..e6d0619091 --- /dev/null +++ b/elf/readlib.c @@ -0,0 +1,160 @@ +/* Copyright (C) 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Jaeger <aj@suse.de>, 1999 and + Jakub Jelinek <jakub@redhat.com>, 1999. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* The code in this file and in readelflib is a heavily simplified + version of the readelf program that's part of the current binutils + development version. Besides the simplification, it has also been + modified to read some other file formats. */ + + +#include <a.out.h> +#include <elf.h> +#include <error.h> +#include <link.h> +#include <libintl.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#include <sys/mman.h> +#include <sys/stat.h> + +#include "ldconfig.h" + +#define Elf32_CLASS ELFCLASS32 +#define Elf64_CLASS ELFCLASS64 + +struct known_names +{ + const char *soname; + int flag; +}; + +static struct known_names interpreters [] = +{ + {"/lib/ld-linux.so.2", FLAG_ELF_LIBC6}, + {"/lib/ld-linux.so.1", FLAG_ELF_LIBC5} +}; + +static struct known_names known_libs [] = +{ + {"libc.so.6", FLAG_ELF_LIBC6}, + {"libc.so.5", FLAG_ELF_LIBC5}, + {"libm.so.6", FLAG_ELF_LIBC6}, + {"libm.so.5", FLAG_ELF_LIBC5} +}; + + + +/* Returns 0 if everything is ok, != 0 in case of error. */ +int +process_file (const char *file_name, const char *lib, int *flag, char **soname, int is_link) +{ + FILE *file; + struct stat statbuf; + void *file_contents; + int ret; + + ElfW(Ehdr) *elf_header; + struct exec *aout_header; + + ret = 0; + *flag = FLAG_ANY; + *soname = NULL; + + file = fopen (file_name, "rb"); + if (file == NULL) + { + /* No error for stale symlink. */ + if (is_link && strstr (file_name, ".so.") != NULL) + return 1; + error (0, 0, _("Input file %s not found.\n"), file_name); + return 1; + } + + if (fstat (fileno (file), &statbuf) < 0) + { + error (0, 0, _("Cannot fstat file %s.\n"), file_name); + return 1; + } + + file_contents = mmap (0, statbuf.st_size, PROT_READ, MAP_SHARED, fileno (file), 0); + if (file_contents == MAP_FAILED) + { + error (0, 0, _("Cannot mmap file %s.\n"), file_name); + fclose (file); + return 1; + } + + /* First check if this is an aout file. */ + aout_header = (struct exec *) file_contents; + if (N_MAGIC (*aout_header) == ZMAGIC + || N_MAGIC (*aout_header) == QMAGIC) + { + /* Aout files don't have a soname, just return the the name + including the major number. */ + char *copy, *major, *dot; + copy = xstrdup (lib); + major = strstr (copy, ".so."); + if (major) + { + dot = strstr (major + 4, "."); + if (dot) + *dot = '\0'; + } + *soname = copy; + *flag = FLAG_LIBC4; + goto done; + } + + elf_header = (ElfW(Ehdr) *) file_contents; + if (elf_header->e_ident [EI_MAG0] != ELFMAG0 + || elf_header->e_ident [EI_MAG1] != ELFMAG1 + || elf_header->e_ident [EI_MAG2] != ELFMAG2 + || elf_header->e_ident [EI_MAG3] != ELFMAG3) + { + /* The file is neither ELF nor aout. Check if it's a linker script, + like libc.so - otherwise complain. */ + int len = statbuf.st_size; + /* Only search the beginning of the file. */ + if (len > 512) + len = 512; + if (memmem (file_contents, len, "GROUP", 5) == NULL + && memmem (file_contents, len, "GNU ld script", 13) == NULL) + error (0, 0, _("%s is not an ELF file - it has the wrong magic bytes at the start.\n"), + file_name); + ret = 1; + goto done; + } + + if (process_elf_file (file_name, lib, flag, soname, file_contents)) + ret = 1; + + done: + /* Clean up allocated memory and resources. */ + munmap (file_contents, statbuf.st_size); + fclose (file); + + return ret; +} + +/* Get architecture specific version of process_elf_file. */ +#include "readelflib.c" + |