Blame tests/elfgetchdr.c

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/* Copyright (C) 2015 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 <assert.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include ELFUTILS_HEADER(elf)
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#include ELFUTILS_HEADER(dwelf)
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#include <gelf.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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int
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main (int argc, char *argv[])
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{
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  int result = 0;
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  int cnt;
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  elf_version (EV_CURRENT);
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  for (cnt = 1; cnt < argc; ++cnt)
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    {
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      int fd = open (argv[cnt], O_RDONLY);
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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 ("%s not usable %s\n", argv[cnt], elf_errmsg (-1));
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	  result = 1;
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	  close (fd);
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	  continue;
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	}
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      size_t shdrstrndx;
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      if (elf_getshdrstrndx (elf, &shdrstrndx) == -1)
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	{
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	  printf ("elf_getshdrstrnd failed %s\n", elf_errmsg (-1));
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	  result = 1;
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	  close (fd);
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	  continue;
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	}
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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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	  int idx = elf_ndxscn (scn);
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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 ("gelf_getshdr failed: %s\n", elf_errmsg (-1));
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	      result = 1;
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	      break;
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	    }
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	  if ((shdr.sh_flags & SHF_COMPRESSED) != 0)
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	    {
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	      GElf_Chdr chdr;
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	      if (gelf_getchdr (scn, &chdr) == NULL)
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		{
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		  printf ("gelf_getchdr failed: %s\n", elf_errmsg (-1));
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		  result = 1;
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		  break;
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		}
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	      printf ("section %d: ELF Compressed ch_type: %" PRId32
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		      ", ch_size: %" PRIx64 ", ch_addralign: %" PRIx64 "\n",
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		      idx, chdr.ch_type, chdr.ch_size, chdr.ch_addralign);
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	    }
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	  else
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	    {
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	      const char *sname = elf_strptr (elf, shdrstrndx, shdr.sh_name);
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	      if (sname == NULL)
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		{
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		  printf ("couldn't get section name: %s\n", elf_errmsg (-1));
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		  result = 1;
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		  break;
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		}
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	      /* This duplicates what the dwelfgnucompressed testcase does.  */
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	      if (strncmp(".zdebug", sname, strlen (".zdebug")) == 0)
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		{
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		  ssize_t size;
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		  if ((size = dwelf_scn_gnu_compressed_size (scn)) == -1)
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		    {
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		      printf ("dwelf_scn_gnu_compressed_size failed: %s\n",
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			      elf_errmsg (-1));
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		      result = 1;
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		      break;
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		    }
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		  printf ("section %d: GNU Compressed size: %zx\n", idx, size);
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		}
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	      else
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		printf ("section %d: NOT Compressed\n", idx);
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	    }
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	}
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      elf_end (elf);
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      close (fd);
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    }
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  return result;
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}