diff options
Diffstat (limited to 'tests/xlate_notes.c')
| -rw-r--r-- | tests/xlate_notes.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/tests/xlate_notes.c b/tests/xlate_notes.c new file mode 100644 index 00000000..90a4ae27 --- /dev/null +++ b/tests/xlate_notes.c @@ -0,0 +1,157 @@ +/* Test program for extracting ELF Note headers and getting whole notes. + Copyright (C) 2019 Red Hat, Inc. + This file is part of elfutils. + + This file is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + elfutils is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <errno.h> +#include <fcntl.h> +#include <inttypes.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include ELFUTILS_HEADER(elf) +#include <gelf.h> + +int +main (int argc, char *argv[]) +{ + if (argc != 2) + { + printf ("No ELF file given as argument\n"); + exit (1); + } + + const char *fname = argv[1]; + + // Initialize libelf. + elf_version (EV_CURRENT); + + /* Read the ELF from disk now. */ + int fd = open (fname, O_RDONLY); + if (fd == -1) + { + printf ("cannot open '%s': %s\n", fname, strerror (errno)); + exit (1); + } + + Elf *elf = elf_begin (fd, ELF_C_READ, NULL); + if (elf == NULL) + { + printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1)); + exit (1); + } + + GElf_Ehdr ehdr; + if (gelf_getehdr (elf, &ehdr) == NULL) + { + printf ("cannot get Ehdr: %s\n", elf_errmsg (-1)); + exit (1); + } + + /* Search for all SHT_NOTE sections. */ + Elf_Scn *scn = NULL; + while ((scn = elf_nextscn (elf, scn)) != NULL) + { + /* Get the header. */ + GElf_Shdr shdr; + if (gelf_getshdr (scn, &shdr) == NULL) + { + printf ("couldn't get shdr: %s\n", elf_errmsg (-1)); + exit (1); + } + + if (shdr.sh_type == SHT_NOTE) + { + printf ("Notes in section %zd:\n", elf_ndxscn (scn)); + + Elf_Data *raw = elf_rawdata (scn, NULL); + if (raw == NULL) + { + printf ("couldn't get raw data: %s\n", elf_errmsg (-1)); + exit (1); + } + + Elf_Data *data = elf_getdata (scn, NULL); + if (data == NULL) + { + printf ("couldn't get data: %s\n", elf_errmsg (-1)); + exit (1); + } + + size_t off = 0; + size_t next; + GElf_Nhdr nhdr; + size_t n_off; + size_t d_off; + while ((next = gelf_getnote (data, off, &nhdr, &n_off, &d_off)) > 0) + { + /* Now just get the note header "raw" (don't + copy/translate the note data). This only handles + traditional GNU ELF Notes, so we still use the next + from gelf_getnote (padding is different for new style + ELF_T_NHDR8 notes). */ + Elf32_Nhdr nh; + Elf_Data src = + { + .d_version = EV_CURRENT, .d_type = ELF_T_NHDR, + .d_size = sizeof nh + }; + Elf_Data dst = src; + src.d_buf = raw->d_buf + off; + dst.d_buf = &nh; + + if (elf32_xlatetom (&dst, &src, ehdr.e_ident[EI_DATA]) == NULL) + { + printf ("couldn't xlate note: %s\n", elf_errmsg (-1)); + exit (1); + } + + printf ("type: %" PRId32 ",%" PRId32 + ", namesz: %" PRId32 ",%" PRId32 + ", descsz: %" PRId32 ",%" PRId32 "\n", + nhdr.n_type, nh.n_type, + nhdr.n_namesz, nh.n_namesz, + nhdr.n_descsz, nh.n_descsz); + + if (nhdr.n_type != nh.n_type + || nhdr.n_namesz != nh.n_namesz + || nhdr.n_descsz != nh.n_descsz) + { + printf ("Nhdrs not equal!\n"); + exit (1); + } + + off = next; + } + } + + } + + if (elf_end (elf) != 0) + { + printf ("failure in elf_end: %s\n", elf_errmsg (-1)); + exit (1); + } + + close (fd); + + return 0; +} |