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 
34 int
35 main (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