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 <string.h>
27 #include <stdlib.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <fcntl.h>
31 #include <unistd.h>
32 #include "system.h"
33
34 int
main(int argc,char * argv[])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