1/* Test program for elf_update function.
2   Copyright (C) 2000, 2001, 2002, 2005 Red Hat, Inc.
3   This file is part of elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5
6   This file is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3 of the License, or
9   (at your option) any later version.
10
11   elfutils is distributed in the hope that it will be useful, but
12   WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18
19#ifdef HAVE_CONFIG_H
20# include <config.h>
21#endif
22
23#include <errno.h>
24#include <fcntl.h>
25#include <libelf.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <unistd.h>
30
31#include ELFUTILS_HEADER(ebl)
32
33
34int
35main (int argc, char *argv[] __attribute__ ((unused)))
36{
37  const char fname[] = "xxx_update4";
38  int fd;
39  Elf *elf;
40  Elf32_Ehdr *ehdr;
41  Elf32_Phdr *phdr;
42  Elf_Scn *scn;
43  Elf32_Shdr *shdr;
44  Elf_Data *data;
45  struct Ebl_Strtab *shst;
46  struct Ebl_Strent *firstse;
47  struct Ebl_Strent *secondse;
48  struct Ebl_Strent *thirdse;
49  struct Ebl_Strent *fourthse;
50  struct Ebl_Strent *shstrtabse;
51  int i;
52
53  fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666);
54  if (fd == -1)
55    {
56      printf ("cannot open `%s': %s\n", fname, strerror (errno));
57      exit (1);
58    }
59
60  elf_version (EV_CURRENT);
61
62  elf_fill (0x42);
63
64  elf = elf_begin (fd, ELF_C_WRITE, NULL);
65  if (elf == NULL)
66    {
67      printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
68      exit (1);
69    }
70
71  /* Create an ELF header.  */
72  ehdr = elf32_newehdr (elf);
73  if (ehdr == NULL)
74    {
75      printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
76      exit (1);
77    }
78
79  /* Print the ELF header values.  */
80  if (argc > 1)
81    {
82      for (i = 0; i < EI_NIDENT; ++i)
83	printf (" %02x", ehdr->e_ident[i]);
84      printf ("\
85\ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
86	      "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
87	      "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
88	      ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
89	      ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
90	      ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
91	      ehdr->e_shnum, ehdr->e_shstrndx);
92    }
93
94  ehdr->e_ident[0] = 42;
95  ehdr->e_ident[4] = 1;
96  ehdr->e_ident[5] = 1;
97  ehdr->e_ident[6] = 2;
98  ehdr->e_type = ET_EXEC;
99  ehdr->e_version = 1;
100  ehdr->e_ehsize = 1;
101  elf_flagehdr (elf, ELF_C_SET, ELF_F_DIRTY);
102
103  /* Create the program header.  */
104  phdr = elf32_newphdr (elf, 1);
105  if (phdr == NULL)
106    {
107      printf ("cannot create program header: %s\n", elf_errmsg (-1));
108      exit (1);
109    }
110
111  phdr[0].p_type = PT_PHDR;
112  elf_flagphdr (elf, ELF_C_SET, ELF_F_DIRTY);
113
114  shst = ebl_strtabinit (true);
115
116  scn = elf_newscn (elf);
117  if (scn == NULL)
118    {
119      printf ("cannot create first section: %s\n", elf_errmsg (-1));
120      exit (1);
121    }
122  shdr = elf32_getshdr (scn);
123  if (shdr == NULL)
124    {
125      printf ("cannot get header for first section: %s\n", elf_errmsg (-1));
126      exit (1);
127    }
128
129  firstse = ebl_strtabadd (shst, ".first", 0);
130
131  shdr->sh_type = SHT_PROGBITS;
132  shdr->sh_flags = SHF_ALLOC | SHF_EXECINSTR;
133  shdr->sh_addr = 0;
134  shdr->sh_link = 0;
135  shdr->sh_info = 0;
136  shdr->sh_entsize = 1;
137
138  data = elf_newdata (scn);
139  if (data == NULL)
140    {
141      printf ("cannot create data first section: %s\n", elf_errmsg (-1));
142      exit (1);
143    }
144
145  data->d_buf = "hello";
146  data->d_type = ELF_T_BYTE;
147  data->d_version = EV_CURRENT;
148  data->d_size = 5;
149  data->d_align = 16;
150
151
152  scn = elf_newscn (elf);
153  if (scn == NULL)
154    {
155      printf ("cannot create second section: %s\n", elf_errmsg (-1));
156      exit (1);
157    }
158  shdr = elf32_getshdr (scn);
159  if (shdr == NULL)
160    {
161      printf ("cannot get header for second section: %s\n", elf_errmsg (-1));
162      exit (1);
163    }
164
165  secondse = ebl_strtabadd (shst, ".second", 0);
166
167  shdr->sh_type = SHT_PROGBITS;
168  shdr->sh_flags = SHF_ALLOC | SHF_WRITE;
169  shdr->sh_addr = 0;
170  shdr->sh_link = 0;
171  shdr->sh_info = 0;
172  shdr->sh_entsize = 1;
173
174  data = elf_newdata (scn);
175  if (data == NULL)
176    {
177      printf ("cannot create data second section: %s\n", elf_errmsg (-1));
178      exit (1);
179    }
180
181  data->d_buf = "world";
182  data->d_type = ELF_T_BYTE;
183  data->d_version = EV_CURRENT;
184  data->d_size = 5;
185  data->d_align = 16;
186
187
188  scn = elf_newscn (elf);
189  if (scn == NULL)
190    {
191      printf ("cannot create third section: %s\n", elf_errmsg (-1));
192      exit (1);
193    }
194  shdr = elf32_getshdr (scn);
195  if (shdr == NULL)
196    {
197      printf ("cannot get header for third section: %s\n", elf_errmsg (-1));
198      exit (1);
199    }
200
201  thirdse = ebl_strtabadd (shst, ".third", 0);
202
203  shdr->sh_type = SHT_PROGBITS;
204  shdr->sh_flags = SHF_ALLOC | SHF_EXECINSTR;
205  shdr->sh_addr = 0;
206  shdr->sh_link = 0;
207  shdr->sh_info = 0;
208  shdr->sh_entsize = 1;
209
210  data = elf_newdata (scn);
211  if (data == NULL)
212    {
213      printf ("cannot create data third section: %s\n", elf_errmsg (-1));
214      exit (1);
215    }
216
217  data->d_buf = "!!!!!";
218  data->d_type = ELF_T_BYTE;
219  data->d_version = EV_CURRENT;
220  data->d_size = 5;
221  data->d_align = 16;
222
223
224  scn = elf_newscn (elf);
225  if (scn == NULL)
226    {
227      printf ("cannot create fourth section: %s\n", elf_errmsg (-1));
228      exit (1);
229    }
230  shdr = elf32_getshdr (scn);
231  if (shdr == NULL)
232    {
233      printf ("cannot get header for fourth section: %s\n", elf_errmsg (-1));
234      exit (1);
235    }
236
237  fourthse = ebl_strtabadd (shst, ".fourth", 0);
238
239  shdr->sh_type = SHT_NOBITS;
240  shdr->sh_flags = SHF_ALLOC | SHF_EXECINSTR;
241  shdr->sh_addr = 0;
242  shdr->sh_link = 0;
243  shdr->sh_info = 0;
244  shdr->sh_entsize = 1;
245  shdr->sh_size = 100;
246
247  data = elf_newdata (scn);
248  if (data == NULL)
249    {
250      printf ("cannot create data fourth section: %s\n", elf_errmsg (-1));
251      exit (1);
252    }
253
254  data->d_buf = NULL;
255  data->d_type = ELF_T_BYTE;
256  data->d_version = EV_CURRENT;
257  data->d_size = 100;
258  data->d_align = 16;
259
260
261  scn = elf_newscn (elf);
262  if (scn == NULL)
263    {
264      printf ("cannot create SHSTRTAB section: %s\n", elf_errmsg (-1));
265      exit (1);
266    }
267  shdr = elf32_getshdr (scn);
268  if (shdr == NULL)
269    {
270      printf ("cannot get header for SHSTRTAB section: %s\n", elf_errmsg (-1));
271      exit (1);
272    }
273
274  shstrtabse = ebl_strtabadd (shst, ".shstrtab", 0);
275
276  shdr->sh_type = SHT_STRTAB;
277  shdr->sh_flags = 0;
278  shdr->sh_addr = 0;
279  shdr->sh_link = SHN_UNDEF;
280  shdr->sh_info = SHN_UNDEF;
281  shdr->sh_entsize = 1;
282
283  /* We have to store the section index in the ELF header.  */
284  ehdr->e_shstrndx = elf_ndxscn (scn);
285
286  data = elf_newdata (scn);
287  if (data == NULL)
288    {
289      printf ("cannot create data SHSTRTAB section: %s\n", elf_errmsg (-1));
290      exit (1);
291    }
292
293  /* No more sections, finalize the section header string table.  */
294  ebl_strtabfinalize (shst, data);
295
296  elf32_getshdr (elf_getscn (elf, 1))->sh_name = ebl_strtaboffset (firstse);
297  elf32_getshdr (elf_getscn (elf, 2))->sh_name = ebl_strtaboffset (secondse);
298  elf32_getshdr (elf_getscn (elf, 3))->sh_name = ebl_strtaboffset (thirdse);
299  elf32_getshdr (elf_getscn (elf, 4))->sh_name = ebl_strtaboffset (fourthse);
300  shdr->sh_name = ebl_strtaboffset (shstrtabse);
301
302  /* Let the library compute the internal structure information.  */
303  if (elf_update (elf, ELF_C_NULL) < 0)
304    {
305      printf ("failure in elf_update(NULL): %s\n", elf_errmsg (-1));
306      exit (1);
307    }
308
309  ehdr = elf32_getehdr (elf);
310
311  phdr[0].p_offset = ehdr->e_phoff;
312  phdr[0].p_offset = ehdr->e_phoff;
313  phdr[0].p_vaddr = ehdr->e_phoff;
314  phdr[0].p_paddr = ehdr->e_phoff;
315  phdr[0].p_flags = PF_R | PF_X;
316  phdr[0].p_filesz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
317  phdr[0].p_memsz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
318  phdr[0].p_align = sizeof (Elf32_Word);
319
320  /* Write out the file.  */
321  if (elf_update (elf, ELF_C_WRITE) < 0)
322    {
323      printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1));
324      exit (1);
325    }
326
327  /* We don't need the string table anymore.  */
328  ebl_strtabfree (shst);
329
330  /* And the data allocated in the .shstrtab section.  */
331  free (data->d_buf);
332
333  /* Print the ELF header values.  */
334  if (argc > 1)
335    {
336      for (i = 0; i < EI_NIDENT; ++i)
337	printf (" %02x", ehdr->e_ident[i]);
338      printf ("\
339\ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
340	      "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
341	      "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
342	      ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
343	      ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
344	      ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
345	      ehdr->e_shnum, ehdr->e_shstrndx);
346    }
347
348  if (elf_end (elf) != 0)
349    {
350      printf ("failure in elf_end: %s\n", elf_errmsg (-1));
351      exit (1);
352    }
353
354  unlink (fname);
355
356  return 0;
357}
358