/* Copyright (C) 1999-2003, 2005, 2007 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. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; 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 <libintl.h> #include <link.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/mman.h> #include <sys/param.h> #include <sys/stat.h> #include <gnu/lib-names.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_SO, FLAG_ELF_LIBC6 }, #ifdef SYSDEP_KNOWN_INTERPRETER_NAMES SYSDEP_KNOWN_INTERPRETER_NAMES #endif }; static struct known_names known_libs[] = { { LIBC_SO, FLAG_ELF_LIBC6 }, { LIBM_SO, FLAG_ELF_LIBC6 }, #ifdef SYSDEP_KNOWN_LIBRARY_NAMES SYSDEP_KNOWN_LIBRARY_NAMES #endif }; /* Returns 0 if everything is ok, != 0 in case of error. */ int process_file (const char *real_file_name, const char *file_name, const char *lib, int *flag, unsigned int *osversion, char **soname, int is_link, struct stat64 *stat_buf) { FILE *file; struct stat64 statbuf; void *file_contents; int ret; ElfW(Ehdr) *elf_header; struct exec *aout_header; ret = 0; *flag = FLAG_ANY; *soname = NULL; file = fopen (real_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 (fstat64 (fileno (file), &statbuf) < 0) { error (0, 0, _("Cannot fstat file %s.\n"), file_name); fclose (file); return 1; } /* Check that the file is large enough so that we can access the information. We're only checking the size of the headers here. */ if ((size_t) statbuf.st_size < sizeof (struct exec) || (size_t) statbuf.st_size < sizeof (ElfW(Ehdr))) { if (statbuf.st_size == 0) error (0, 0, _("File %s is empty, not checked."), file_name); else { char buf[SELFMAG]; size_t n = MIN (statbuf.st_size, SELFMAG); if (fread (buf, n, 1, file) == 1 && memcmp (buf, ELFMAG, n) == 0) error (0, 0, _("File %s is too small, not checked."), file_name); } fclose (file); 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 #ifdef QMAGIC /* Linuxism. */ || N_MAGIC (*aout_header) == QMAGIC #endif ) { /* Aout files don't have a soname, just return 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 (memcmp (elf_header->e_ident, ELFMAG, SELFMAG) != 0) { /* The file is neither ELF nor aout. Check if it's a linker script, like libc.so - otherwise complain. Only search the beginning of the file. */ size_t len = MIN (statbuf.st_size, 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; } /* Libraries have to be shared object files. */ else if (elf_header->e_type != ET_DYN) ret = 1; else if (process_elf_file (file_name, lib, flag, osversion, soname, file_contents, statbuf.st_size)) ret = 1; done: /* Clean up allocated memory and resources. */ munmap (file_contents, statbuf.st_size); fclose (file); *stat_buf = statbuf; return ret; } /* Returns made up soname if lib doesn't have explicit DT_SONAME. */ char * implicit_soname (const char *lib, int flag) { char *soname = xstrdup (lib); if ((flag & FLAG_TYPE_MASK) != FLAG_LIBC4) return soname; /* Aout files don't have a soname, just return the name including the major number. */ char *major = strstr (soname, ".so."); if (major) { char *dot = strstr (major + 4, "."); if (dot) *dot = '\0'; } return soname; } /* Get architecture specific version of process_elf_file. */ #include <readelflib.c>