Mark Wielaard | 030f626 | 2012-07-18 13:14:30 +0200 | [diff] [blame] | 1 | /* Copyright (C) 2012 Red Hat, Inc. |
| 2 | This file is part of elfutils. |
| 3 | |
| 4 | This file is free software; you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License as published by |
| 6 | the Free Software Foundation; either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | elfutils is distributed in the hope that it will be useful, but |
| 10 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 16 | |
| 17 | #include <sys/types.h> |
| 18 | #include <sys/stat.h> |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <unistd.h> |
| 22 | #include <errno.h> |
| 23 | #include <string.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <gelf.h> |
| 26 | #include <libelf.h> |
| 27 | #include <stdbool.h> |
| 28 | #include <inttypes.h> |
| 29 | |
| 30 | int |
| 31 | main (int argc, char *argv[]) |
| 32 | { |
| 33 | if (argc != 3) |
| 34 | { |
| 35 | fprintf (stderr, "Needs two arguments.\n"); |
| 36 | fprintf (stderr, "First needs to be 'READ', 'MMAP' or 'FDREAD'\n"); |
| 37 | fprintf (stderr, "Second is the ELF file to read.\n"); |
| 38 | exit (2); /* user error */ |
| 39 | } |
| 40 | |
| 41 | bool do_mmap = false; |
| 42 | bool close_fd = false; |
| 43 | if (strcmp (argv[1], "READ") == 0) |
| 44 | { |
| 45 | do_mmap = false; |
| 46 | close_fd = false; |
| 47 | } |
| 48 | else if (strcmp (argv[1], "MMAP") == 0) |
| 49 | { |
| 50 | do_mmap = true; |
| 51 | close_fd = false; |
| 52 | } |
| 53 | else if (strcmp (argv[1], "FDREAD") == 0) |
| 54 | { |
| 55 | do_mmap = false; |
| 56 | close_fd = true; |
| 57 | } |
| 58 | else |
| 59 | { |
| 60 | fprintf (stderr, "First arg needs to be 'READ', 'MMAP' or 'FDREAD'\n"); |
| 61 | exit (2); /* user error */ |
| 62 | } |
| 63 | |
| 64 | elf_version (EV_CURRENT); |
| 65 | |
| 66 | int fd = open (argv[2], O_RDONLY); |
| 67 | if (fd < 0) |
| 68 | { |
| 69 | fprintf (stderr, "Cannot open input file %s: %s\n", argv[2], |
| 70 | strerror (errno)); |
| 71 | exit (2); |
| 72 | } |
| 73 | |
| 74 | Elf *elf = elf_begin (fd, do_mmap ? ELF_C_READ_MMAP : ELF_C_READ, NULL); |
| 75 | if (elf == NULL) |
| 76 | { |
| 77 | fprintf (stderr, "elf_begin failed for %s: %s\n", argv[2], |
| 78 | elf_errmsg (-1)); |
| 79 | exit (2); |
| 80 | } |
| 81 | |
| 82 | if (! do_mmap && close_fd) |
| 83 | { |
| 84 | if (elf_cntl (elf, ELF_C_FDREAD) < 0) |
| 85 | { |
| 86 | fprintf (stderr, "elf_cntl failed for %s: %s\n", argv[2], |
| 87 | elf_errmsg (-1)); |
| 88 | exit (1); |
| 89 | } |
| 90 | close (fd); |
| 91 | } |
| 92 | |
| 93 | Elf_Scn *scn = NULL; |
| 94 | while ((scn = elf_nextscn (elf, scn)) != NULL) |
| 95 | { |
| 96 | GElf_Shdr shdr_mem; |
| 97 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| 98 | printf ("Section at offset %#0" PRIx64 "\n", shdr->sh_offset); |
| 99 | } |
| 100 | |
| 101 | elf_end (elf); |
| 102 | exit (0); |
| 103 | } |