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158 lines
3.8 KiB
158 lines
3.8 KiB
/* Test program for extracting ELF Note headers and getting whole notes.
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Copyright (C) 2019 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include ELFUTILS_HEADER(elf)
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#include <gelf.h>
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int
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main (int argc, char *argv[])
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{
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if (argc != 2)
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{
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printf ("No ELF file given as argument\n");
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exit (1);
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}
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const char *fname = argv[1];
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// Initialize libelf.
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elf_version (EV_CURRENT);
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/* Read the ELF from disk now. */
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int fd = open (fname, O_RDONLY);
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if (fd == -1)
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{
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printf ("cannot open '%s': %s\n", fname, strerror (errno));
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exit (1);
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}
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Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
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if (elf == NULL)
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{
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printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
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exit (1);
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}
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GElf_Ehdr ehdr;
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if (gelf_getehdr (elf, &ehdr) == NULL)
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{
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printf ("cannot get Ehdr: %s\n", elf_errmsg (-1));
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exit (1);
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}
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/* Search for all SHT_NOTE sections. */
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Elf_Scn *scn = NULL;
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while ((scn = elf_nextscn (elf, scn)) != NULL)
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{
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/* Get the header. */
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GElf_Shdr shdr;
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if (gelf_getshdr (scn, &shdr) == NULL)
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{
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printf ("couldn't get shdr: %s\n", elf_errmsg (-1));
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exit (1);
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}
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if (shdr.sh_type == SHT_NOTE)
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{
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printf ("Notes in section %zd:\n", elf_ndxscn (scn));
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Elf_Data *raw = elf_rawdata (scn, NULL);
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if (raw == NULL)
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{
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printf ("couldn't get raw data: %s\n", elf_errmsg (-1));
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exit (1);
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}
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Elf_Data *data = elf_getdata (scn, NULL);
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if (data == NULL)
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{
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printf ("couldn't get data: %s\n", elf_errmsg (-1));
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exit (1);
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}
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size_t off = 0;
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size_t next;
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GElf_Nhdr nhdr;
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size_t n_off;
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size_t d_off;
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while ((next = gelf_getnote (data, off, &nhdr, &n_off, &d_off)) > 0)
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{
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/* Now just get the note header "raw" (don't
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copy/translate the note data). This only handles
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traditional GNU ELF Notes, so we still use the next
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from gelf_getnote (padding is different for new style
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ELF_T_NHDR8 notes). */
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Elf32_Nhdr nh;
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Elf_Data src =
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{
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.d_version = EV_CURRENT, .d_type = ELF_T_NHDR,
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.d_size = sizeof nh
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};
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Elf_Data dst = src;
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src.d_buf = raw->d_buf + off;
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dst.d_buf = &nh;
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if (elf32_xlatetom (&dst, &src, ehdr.e_ident[EI_DATA]) == NULL)
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{
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printf ("couldn't xlate note: %s\n", elf_errmsg (-1));
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exit (1);
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}
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printf ("type: %" PRId32 ",%" PRId32
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", namesz: %" PRId32 ",%" PRId32
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", descsz: %" PRId32 ",%" PRId32 "\n",
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nhdr.n_type, nh.n_type,
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nhdr.n_namesz, nh.n_namesz,
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nhdr.n_descsz, nh.n_descsz);
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if (nhdr.n_type != nh.n_type
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|| nhdr.n_namesz != nh.n_namesz
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|| nhdr.n_descsz != nh.n_descsz)
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{
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printf ("Nhdrs not equal!\n");
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exit (1);
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}
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off = next;
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}
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}
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}
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if (elf_end (elf) != 0)
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{
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printf ("failure in elf_end: %s\n", elf_errmsg (-1));
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exit (1);
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}
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close (fd);
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return 0;
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}
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