| /* Copyright (C) 2012 Red Hat, Inc. |
| This file is part of elfutils. |
| |
| This file 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; either version 3 of the License, or |
| (at your option) any later version. |
| |
| elfutils 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <fcntl.h> |
| #include <gelf.h> |
| #include <libelf.h> |
| #include <stdbool.h> |
| #include <inttypes.h> |
| |
| int |
| main (int argc, char *argv[]) |
| { |
| if (argc != 3) |
| { |
| fprintf (stderr, "Needs two arguments.\n"); |
| fprintf (stderr, "First needs to be 'READ', 'MMAP' or 'FDREAD'\n"); |
| fprintf (stderr, "Second is the ELF file to read.\n"); |
| exit (2); /* user error */ |
| } |
| |
| bool do_mmap = false; |
| bool close_fd = false; |
| if (strcmp (argv[1], "READ") == 0) |
| { |
| do_mmap = false; |
| close_fd = false; |
| } |
| else if (strcmp (argv[1], "MMAP") == 0) |
| { |
| do_mmap = true; |
| close_fd = false; |
| } |
| else if (strcmp (argv[1], "FDREAD") == 0) |
| { |
| do_mmap = false; |
| close_fd = true; |
| } |
| else |
| { |
| fprintf (stderr, "First arg needs to be 'READ', 'MMAP' or 'FDREAD'\n"); |
| exit (2); /* user error */ |
| } |
| |
| elf_version (EV_CURRENT); |
| |
| int fd = open (argv[2], O_RDONLY); |
| if (fd < 0) |
| { |
| fprintf (stderr, "Cannot open input file %s: %s\n", argv[2], |
| strerror (errno)); |
| exit (2); |
| } |
| |
| Elf *elf = elf_begin (fd, do_mmap ? ELF_C_READ_MMAP : ELF_C_READ, NULL); |
| if (elf == NULL) |
| { |
| fprintf (stderr, "elf_begin failed for %s: %s\n", argv[2], |
| elf_errmsg (-1)); |
| exit (2); |
| } |
| |
| if (! do_mmap && close_fd) |
| { |
| if (elf_cntl (elf, ELF_C_FDREAD) < 0) |
| { |
| fprintf (stderr, "elf_cntl failed for %s: %s\n", argv[2], |
| elf_errmsg (-1)); |
| exit (1); |
| } |
| close (fd); |
| } |
| |
| Elf_Scn *scn = NULL; |
| while ((scn = elf_nextscn (elf, scn)) != NULL) |
| { |
| GElf_Shdr shdr_mem; |
| GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| printf ("Section at offset %#0" PRIx64 "\n", shdr->sh_offset); |
| } |
| |
| elf_end (elf); |
| exit (0); |
| } |