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update4.c

/* Test program for elf_update function.
   Copyright (C) 2000, 2001, 2002, 2005 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 2000.

   Red Hat elfutils 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; version 2 of the License.

   Red Hat 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 Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
   license is granted, either expressly or impliedly, by designation as an
   included package.  Should you wish to participate in the Open Invention
   Network licensing program, please visit www.openinventionnetwork.com
   <http://www.openinventionnetwork.com>.  */

#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(ebl)


int
main (int argc, char *argv[] __attribute__ ((unused)))
{
  const char fname[] = "xxx";
  int fd;
  Elf *elf;
  Elf32_Ehdr *ehdr;
  Elf32_Phdr *phdr;
  Elf_Scn *scn;
  Elf32_Shdr *shdr;
  Elf_Data *data;
  struct Ebl_Strtab *shst;
  struct Ebl_Strent *firstse;
  struct Ebl_Strent *secondse;
  struct Ebl_Strent *thirdse;
  struct Ebl_Strent *fourthse;
  struct Ebl_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 = ebl_strtabinit (true);

  scn = elf_newscn (elf);
  if (scn == NULL)
    {
      printf ("cannot create first section: %s\n", elf_errmsg (-1));
      exit (1);
    }
  shdr = elf32_getshdr (scn);
  if (shdr == NULL)
    {
      printf ("cannot get header for first section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  firstse = ebl_strtabadd (shst, ".first", 0);

  shdr->sh_type = SHT_PROGBITS;
  shdr->sh_flags = SHF_ALLOC | SHF_EXECINSTR;
  shdr->sh_addr = 0;
  shdr->sh_link = 0;
  shdr->sh_info = 0;
  shdr->sh_entsize = 1;

  data = elf_newdata (scn);
  if (data == NULL)
    {
      printf ("cannot create data first section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  data->d_buf = "hello";
  data->d_type = ELF_T_BYTE;
  data->d_version = EV_CURRENT;
  data->d_size = 5;
  data->d_align = 16;


  scn = elf_newscn (elf);
  if (scn == NULL)
    {
      printf ("cannot create second section: %s\n", elf_errmsg (-1));
      exit (1);
    }
  shdr = elf32_getshdr (scn);
  if (shdr == NULL)
    {
      printf ("cannot get header for second section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  secondse = ebl_strtabadd (shst, ".second", 0);

  shdr->sh_type = SHT_PROGBITS;
  shdr->sh_flags = SHF_ALLOC | SHF_WRITE;
  shdr->sh_addr = 0;
  shdr->sh_link = 0;
  shdr->sh_info = 0;
  shdr->sh_entsize = 1;

  data = elf_newdata (scn);
  if (data == NULL)
    {
      printf ("cannot create data second section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  data->d_buf = "world";
  data->d_type = ELF_T_BYTE;
  data->d_version = EV_CURRENT;
  data->d_size = 5;
  data->d_align = 16;


  scn = elf_newscn (elf);
  if (scn == NULL)
    {
      printf ("cannot create third section: %s\n", elf_errmsg (-1));
      exit (1);
    }
  shdr = elf32_getshdr (scn);
  if (shdr == NULL)
    {
      printf ("cannot get header for third section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  thirdse = ebl_strtabadd (shst, ".third", 0);

  shdr->sh_type = SHT_PROGBITS;
  shdr->sh_flags = SHF_ALLOC | SHF_EXECINSTR;
  shdr->sh_addr = 0;
  shdr->sh_link = 0;
  shdr->sh_info = 0;
  shdr->sh_entsize = 1;

  data = elf_newdata (scn);
  if (data == NULL)
    {
      printf ("cannot create data third section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  data->d_buf = "!!!!!";
  data->d_type = ELF_T_BYTE;
  data->d_version = EV_CURRENT;
  data->d_size = 5;
  data->d_align = 16;


  scn = elf_newscn (elf);
  if (scn == NULL)
    {
      printf ("cannot create fourth section: %s\n", elf_errmsg (-1));
      exit (1);
    }
  shdr = elf32_getshdr (scn);
  if (shdr == NULL)
    {
      printf ("cannot get header for fourth section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  fourthse = ebl_strtabadd (shst, ".fourth", 0);

  shdr->sh_type = SHT_NOBITS;
  shdr->sh_flags = SHF_ALLOC | SHF_EXECINSTR;
  shdr->sh_addr = 0;
  shdr->sh_link = 0;
  shdr->sh_info = 0;
  shdr->sh_entsize = 1;
  shdr->sh_size = 100;

  data = elf_newdata (scn);
  if (data == NULL)
    {
      printf ("cannot create data fourth section: %s\n", elf_errmsg (-1));
      exit (1);
    }

  data->d_buf = NULL;
  data->d_type = ELF_T_BYTE;
  data->d_version = EV_CURRENT;
  data->d_size = 100;
  data->d_align = 16;


  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 = ebl_strtabadd (shst, ".shstrtab", 0);

  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_entsize = 1;

  /* 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.  */
  ebl_strtabfinalize (shst, data);

  elf32_getshdr (elf_getscn (elf, 1))->sh_name = ebl_strtaboffset (firstse);
  elf32_getshdr (elf_getscn (elf, 2))->sh_name = ebl_strtaboffset (secondse);
  elf32_getshdr (elf_getscn (elf, 3))->sh_name = ebl_strtaboffset (thirdse);
  elf32_getshdr (elf_getscn (elf, 4))->sh_name = ebl_strtaboffset (fourthse);
  shdr->sh_name = ebl_strtaboffset (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.  */
  ebl_strtabfree (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;
}

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