/* Test program for elf_update function.

   Copyright (C) 2000, 2002, 2005, 2016 Red Hat, Inc.

   This file is part of elfutils.

   Written by Ulrich Drepper <drepper@redhat.com>, 2000.

   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 <libelf.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include ELFUTILS_HEADER(dwelf)

int

main (int argc, char *argv[] __attribute__ ((unused)))

{

  const char *fname = "xxx_update3";

  int fd;

  Elf *elf;

  Elf32_Ehdr *ehdr;

  Elf32_Phdr *phdr;

  Elf_Scn *scn;

  Elf32_Shdr *shdr;

  Elf_Data *data;

  Dwelf_Strtab *shst;

  Dwelf_Strent *shstrtabse;

  int i;

  fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666);

  if (fd == -1)

    {

      printf ("cannot open `%s': %s\n", fname, strerror (errno));

      exit (1);

    }

  elf_version (EV_CURRENT);

  elf_fill (0x42);

  elf = elf_begin (fd, ELF_C_WRITE, NULL);

  if (elf == NULL)

    {

      printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));

      exit (1);

    }

  /* Create an ELF header.  */

  ehdr = elf32_newehdr (elf);

  if (ehdr == NULL)

    {

      printf ("cannot create ELF header: %s\n", elf_errmsg (-1));

      exit (1);

    }

  /* Print the ELF header values.  */

  if (argc > 1)

    {

      for (i = 0; i < EI_NIDENT; ++i)

	printf (" %02x", ehdr->e_ident[i]);

      printf ("\

\ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"

	      "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"

	      "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",

	      ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,

	      ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,

	      ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,

	      ehdr->e_shnum, ehdr->e_shstrndx);

    }

  ehdr->e_ident[0] = 42;

  ehdr->e_ident[4] = 1;

  ehdr->e_ident[5] = 1;

  ehdr->e_ident[6] = 2;

  ehdr->e_type = ET_EXEC;

  ehdr->e_version = 1;

  ehdr->e_ehsize = 1;

  elf_flagehdr (elf, ELF_C_SET, ELF_F_DIRTY);

  /* Create the program header.  */

  phdr = elf32_newphdr (elf, 1);

  if (phdr == NULL)

    {

      printf ("cannot create program header: %s\n", elf_errmsg (-1));

      exit (1);

    }

  phdr[0].p_type = PT_PHDR;

  elf_flagphdr (elf, ELF_C_SET, ELF_F_DIRTY);

  shst = dwelf_strtab_init (true);

  scn = elf_newscn (elf);

  if (scn == NULL)

    {

      printf ("cannot create SHSTRTAB section: %s\n", elf_errmsg (-1));

      exit (1);

    }

  shdr = elf32_getshdr (scn);

  if (shdr == NULL)

    {

      printf ("cannot get header for SHSTRTAB section: %s\n", elf_errmsg (-1));

      exit (1);

    }

  shstrtabse = dwelf_strtab_add (shst, ".shstrtab");

  shdr->sh_type = SHT_STRTAB;

  shdr->sh_flags = 0;

  shdr->sh_addr = 0;

  shdr->sh_link = SHN_UNDEF;

  shdr->sh_info = SHN_UNDEF;

  shdr->sh_addralign = 1;

  shdr->sh_entsize = 0;

  /* We have to store the section index in the ELF header.  */

  ehdr->e_shstrndx = elf_ndxscn (scn);

  data = elf_newdata (scn);

  if (data == NULL)

    {

      printf ("cannot create data SHSTRTAB section: %s\n", elf_errmsg (-1));

      exit (1);

    }

  /* No more sections, finalize the section header string table.  */

  dwelf_strtab_finalize (shst, data);

  shdr->sh_name = dwelf_strent_off (shstrtabse);

  /* Let the library compute the internal structure information.  */

  if (elf_update (elf, ELF_C_NULL) < 0)

    {

      printf ("failure in elf_update(NULL): %s\n", elf_errmsg (-1));

      exit (1);

    }

  ehdr = elf32_getehdr (elf);

  phdr[0].p_offset = ehdr->e_phoff;

  phdr[0].p_offset = ehdr->e_phoff;

  phdr[0].p_vaddr = ehdr->e_phoff;

  phdr[0].p_paddr = ehdr->e_phoff;

  phdr[0].p_flags = PF_R | PF_X;

  phdr[0].p_filesz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);

  phdr[0].p_memsz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);

  phdr[0].p_align = sizeof (Elf32_Word);

  /* Write out the file.  */

  if (elf_update (elf, ELF_C_WRITE) < 0)

    {

      printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1));

      exit (1);

    }

  /* We don't need the string table anymore.  */

  dwelf_strtab_free (shst);

  /* And the data allocated in the .shstrtab section.  */

  free (data->d_buf);

  /* Print the ELF header values.  */

  if (argc > 1)

    {

      for (i = 0; i < EI_NIDENT; ++i)

	printf (" %02x", ehdr->e_ident[i]);

      printf ("\

\ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"

	      "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"

	      "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",

	      ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,

	      ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,

	      ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,

	      ehdr->e_shnum, ehdr->e_shstrndx);

    }

  if (elf_end (elf) != 0)

    {

      printf ("failure in elf_end: %s\n", elf_errmsg (-1));

      exit (1);

    }

  unlink (fname);

  return 0;

}