1/* Test program for dwelf_elf_gnu_build_id, print build ID.
2   Copyright (C) 2014 Red Hat, Inc.
3   This file is part of elfutils.
4
5   This file is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   elfutils is distributed in the hope that it will be useful, but
11   WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include <config.h>
19#include <assert.h>
20#include <inttypes.h>
21#include <err.h>
22#include <errno.h>
23#include ELFUTILS_HEADER(elf)
24#include ELFUTILS_HEADER(dwelf)
25#include <stdio.h>
26#include <error.h>
27#include <string.h>
28#include <stdlib.h>
29#include <sys/types.h>
30#include <sys/stat.h>
31#include <fcntl.h>
32#include <unistd.h>
33
34int
35main (int argc, char *argv[])
36{
37  if (argc < 2)
38    error (EXIT_FAILURE, 0, "No input file given");
39
40  elf_version (EV_CURRENT);
41
42  for (int i = 1; i < argc; i++)
43    {
44      const char *file = argv[i];
45      int fd = open (file, O_RDONLY);
46      if (fd < 0)
47	error (EXIT_FAILURE, errno, "couldn't open file '%s'", file);
48
49      Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
50      if (elf == NULL)
51	{
52	  printf("%s: elf_begin failed: %s\n", file, elf_errmsg (-1));
53	  close (fd);
54	  continue;
55	}
56
57      const void *build_id;
58      ssize_t len = dwelf_elf_gnu_build_id (elf, &build_id);
59      switch (len)
60	{
61	case 0:
62	  printf ("%s: <no NT_GNU_BUILD_ID note>\n", file);
63	  break;
64	case -1:
65	  errx (1, "dwelf_elf_gnu_build_id (%s): %s",
66		file, elf_errmsg (-1));
67	default:
68	  printf ("%s: build ID: ", file);
69	  const unsigned char *p = build_id;
70	  const unsigned char *end = p + len;
71	  while (p < end)
72	      printf("%02x", (unsigned)*p++);
73	  putchar('\n');
74	}
75
76      elf_end (elf);
77      close (fd);
78    }
79
80  return 0;
81}
82