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/* Test program for adding section and program headers and ehdr updates.
Copyright (C) 2015 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/>. */
#include <config.h>
#include <assert.h>
#include ELFUTILS_HEADER(elf)
#include <gelf.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdbool.h>
void
check (const char *msg, bool statement)
{
if (! statement)
{
fprintf (stderr, "%s FAILED\n", msg);
exit (-1);
}
else
fprintf (stderr, "%s OK\n", msg);
}
void
check_elf (const char *msg, bool statement)
{
if (! statement)
{
fprintf (stderr, "%s: %s\n", msg, elf_errmsg (-1));
exit (-1);
}
else
fprintf (stderr, "%s OK\n", msg);
}
void
test (Elf *elf, int class, bool layout)
{
fprintf (stderr, "testing ELF class: %d, layout: %d\n", class, layout);
check_elf ("gelf_newehdr", gelf_newehdr (elf, class) != 0);
check_elf ("gelf_getclass", gelf_getclass (elf) == class);
check_elf ("elf_flagelf", elf_flagelf (elf, layout ? ELF_C_SET : ELF_C_CLR,
ELF_F_LAYOUT) != 0);
GElf_Ehdr ehdr;
check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
check ("e_shnum == 0", ehdr.e_shnum == 0);
check ("e_phnum == 0", ehdr.e_phnum == 0);
check ("e_shoff == 0", ehdr.e_shoff == 0);
check ("e_phoff == 0", ehdr.e_phoff == 0);
size_t shnum;
check_elf ("elf_getshdrnum", elf_getshdrnum (elf, &shnum) == 0);
check ("shnum == 0", shnum == 0);
size_t phnum;
check_elf ("elf_getphdrnum", elf_getphdrnum (elf, &phnum) == 0);
check ("phnum == 0", phnum == 0);
/* Lets fill in some info we are always responsible for. */
ehdr.e_ident[EI_DATA] = ELFDATANONE; /* Ask for native encoding. */
ehdr.e_type = ET_EXEC;
ehdr.e_machine = EM_386;
ehdr.e_version = EV_NONE; /* Ask for current version. */
check_elf ("gelf_update_ehdr", gelf_update_ehdr (elf, &ehdr) != 0);
check_elf ("elf_update", elf_update (elf, ELF_C_NULL) > 0);
check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
check ("EI_DATA", ehdr.e_ident[EI_DATA] != ELFDATANONE);
check ("e_version", ehdr.e_version == EV_CURRENT);
/* The sh/ph values shouldn't have changed. */
check ("e_shnum == 0", ehdr.e_shnum == 0);
check ("e_phnum == 0", ehdr.e_phnum == 0);
check ("e_shoff == 0", ehdr.e_shoff == 0);
check ("e_phoff == 0", ehdr.e_phoff == 0);
check_elf ("elf_getshdrnum", elf_getshdrnum (elf, &shnum) == 0);
check ("shnum == 0", shnum == 0);
check_elf ("elf_getphdrnum", elf_getphdrnum (elf, &phnum) == 0);
check ("phnum == 0", phnum == 0);
/* Lets add a header. */
check_elf ("elf_newscn", elf_newscn (elf) != NULL);
check_elf ("gelf_newphdr", gelf_newphdr (elf, 1) != 0);
/* If we are responsible for the layout ourselves we should also
tell where to put them. */
if (layout)
{
check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
/* phdrs go right after the ehdr. */
ehdr.e_phoff = ehdr.e_ehsize;
/* shdrs go right after the phdrs. */
ehdr.e_shoff = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
check_elf ("gelf_update_ehdr", gelf_update_ehdr (elf, &ehdr) != 0);
}
check_elf ("elf_update", elf_update (elf, ELF_C_NULL) > 0);
check_elf ("elf_getshdrnum", elf_getshdrnum (elf, &shnum) == 0);
check ("shnum == 1", shnum == 2); /* section zero is also created. */
check_elf ("elf_getphdrnum", elf_getphdrnum (elf, &phnum) == 0);
check ("phnum == 1", phnum == 1);
check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
check ("EI_DATA", ehdr.e_ident[EI_DATA] != ELFDATANONE);
check ("e_version", ehdr.e_version == EV_CURRENT);
check ("e_shnum == 2", ehdr.e_shnum == 2);
check ("e_phnum == 1", ehdr.e_phnum == 1);
check ("e_shoff != 0", ehdr.e_shoff != 0);
check ("e_phoff != 0", ehdr.e_phoff != 0);
size_t shentsize = (class == ELFCLASS32
? sizeof (Elf32_Shdr) : sizeof (Elf64_Shdr));
check ("e_shentsize", ehdr.e_shentsize == shentsize);
size_t phentsize = (class == ELFCLASS32
? sizeof (Elf32_Phdr) : sizeof (Elf64_Phdr));
check ("e_phentsize", ehdr.e_phentsize == phentsize);
}
int
main (int argc __attribute__ ((unused)), char **argv __attribute ((unused)))
{
elf_version (EV_CURRENT);
int fd = fd = open("/dev/zero", O_WRONLY);
check ("open", fd >= 0);
Elf *elf;
elf = elf_begin (fd, ELF_C_WRITE, NULL);
check_elf ("elf_begin", elf != NULL);
test (elf, ELFCLASS32, false);
elf_end (elf);
elf = elf_begin (fd, ELF_C_WRITE, NULL);
check_elf ("elf_begin", elf != NULL);
test (elf, ELFCLASS32, true);
elf_end (elf);
elf = elf_begin (fd, ELF_C_WRITE, NULL);
check_elf ("elf_begin", elf != NULL);
test (elf, ELFCLASS64, false);
elf_end (elf);
elf = elf_begin (fd, ELF_C_WRITE, NULL);
check_elf ("elf_begin", elf != NULL);
test (elf, ELFCLASS64, true);
elf_end (elf);
close (fd);
return 0;
}
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