Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Test program for elf_update function. |
| 2 | Copyright (C) 2000, 2002, 2005 Red Hat, Inc. |
| 3 | Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| 4 | |
| 5 | This program is Open Source software; you can redistribute it and/or |
| 6 | modify it under the terms of the Open Software License version 1.0 as |
| 7 | published by the Open Source Initiative. |
| 8 | |
| 9 | You should have received a copy of the Open Software License along |
| 10 | with this program; if not, you may obtain a copy of the Open Software |
| 11 | License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| 12 | by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 13 | 3001 King Ranch Road, Ukiah, CA 95482. */ |
| 14 | |
| 15 | #ifdef HAVE_CONFIG_H |
| 16 | # include <config.h> |
| 17 | #endif |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <fcntl.h> |
| 21 | #include <libelf.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | |
| 26 | #include <libebl.h> |
| 27 | |
| 28 | |
| 29 | int |
| 30 | main (int argc, char *argv[] __attribute__ ((unused))) |
| 31 | { |
| 32 | const char *fname = "xxx"; |
| 33 | int fd; |
| 34 | Elf *elf; |
| 35 | Elf32_Ehdr *ehdr; |
| 36 | Elf32_Phdr *phdr; |
| 37 | Elf_Scn *scn; |
| 38 | Elf32_Shdr *shdr; |
| 39 | Elf_Data *data; |
| 40 | struct Ebl_Strtab *shst; |
| 41 | struct Ebl_Strent *shstrtabse; |
| 42 | int i; |
| 43 | |
| 44 | fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666); |
| 45 | if (fd == -1) |
| 46 | { |
| 47 | printf ("cannot open `%s': %s\n", fname, strerror (errno)); |
| 48 | exit (1); |
| 49 | } |
| 50 | |
| 51 | elf_version (EV_CURRENT); |
| 52 | |
| 53 | elf_fill (0x42); |
| 54 | |
| 55 | elf = elf_begin (fd, ELF_C_WRITE, NULL); |
| 56 | if (elf == NULL) |
| 57 | { |
| 58 | printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1)); |
| 59 | exit (1); |
| 60 | } |
| 61 | |
| 62 | /* Create an ELF header. */ |
| 63 | ehdr = elf32_newehdr (elf); |
| 64 | if (ehdr == NULL) |
| 65 | { |
| 66 | printf ("cannot create ELF header: %s\n", elf_errmsg (-1)); |
| 67 | exit (1); |
| 68 | } |
| 69 | |
| 70 | /* Print the ELF header values. */ |
| 71 | if (argc > 1) |
| 72 | { |
| 73 | for (i = 0; i < EI_NIDENT; ++i) |
| 74 | printf (" %02x", ehdr->e_ident[i]); |
| 75 | printf ("\ |
| 76 | \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n" |
| 77 | "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n" |
| 78 | "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n", |
| 79 | ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry, |
| 80 | ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize, |
| 81 | ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize, |
| 82 | ehdr->e_shnum, ehdr->e_shstrndx); |
| 83 | } |
| 84 | |
| 85 | ehdr->e_ident[0] = 42; |
| 86 | ehdr->e_ident[4] = 1; |
| 87 | ehdr->e_ident[5] = 1; |
| 88 | ehdr->e_ident[6] = 2; |
| 89 | ehdr->e_type = ET_EXEC; |
| 90 | ehdr->e_version = 1; |
| 91 | ehdr->e_ehsize = 1; |
| 92 | elf_flagehdr (elf, ELF_C_SET, ELF_F_DIRTY); |
| 93 | |
| 94 | /* Create the program header. */ |
| 95 | phdr = elf32_newphdr (elf, 1); |
| 96 | if (phdr == NULL) |
| 97 | { |
| 98 | printf ("cannot create program header: %s\n", elf_errmsg (-1)); |
| 99 | exit (1); |
| 100 | } |
| 101 | |
| 102 | phdr[0].p_type = PT_PHDR; |
| 103 | elf_flagphdr (elf, ELF_C_SET, ELF_F_DIRTY); |
| 104 | |
| 105 | shst = ebl_strtabinit (true); |
| 106 | |
| 107 | scn = elf_newscn (elf); |
| 108 | if (scn == NULL) |
| 109 | { |
| 110 | printf ("cannot create SHSTRTAB section: %s\n", elf_errmsg (-1)); |
| 111 | exit (1); |
| 112 | } |
| 113 | shdr = elf32_getshdr (scn); |
| 114 | if (shdr == NULL) |
| 115 | { |
| 116 | printf ("cannot get header for SHSTRTAB section: %s\n", elf_errmsg (-1)); |
| 117 | exit (1); |
| 118 | } |
| 119 | |
| 120 | shstrtabse = ebl_strtabadd (shst, ".shstrtab", 0); |
| 121 | |
| 122 | shdr->sh_type = SHT_STRTAB; |
| 123 | shdr->sh_flags = 0; |
| 124 | shdr->sh_addr = 0; |
| 125 | shdr->sh_link = SHN_UNDEF; |
| 126 | shdr->sh_info = SHN_UNDEF; |
| 127 | shdr->sh_addralign = 1; |
| 128 | shdr->sh_entsize = 0; |
| 129 | |
| 130 | /* We have to store the section index in the ELF header. */ |
| 131 | ehdr->e_shstrndx = elf_ndxscn (scn); |
| 132 | |
| 133 | data = elf_newdata (scn); |
| 134 | if (data == NULL) |
| 135 | { |
| 136 | printf ("cannot create data SHSTRTAB section: %s\n", elf_errmsg (-1)); |
| 137 | exit (1); |
| 138 | } |
| 139 | |
| 140 | /* No more sections, finalize the section header string table. */ |
| 141 | ebl_strtabfinalize (shst, data); |
| 142 | |
| 143 | shdr->sh_name = ebl_strtaboffset (shstrtabse); |
| 144 | |
| 145 | /* Let the library compute the internal structure information. */ |
| 146 | if (elf_update (elf, ELF_C_NULL) < 0) |
| 147 | { |
| 148 | printf ("failure in elf_update(NULL): %s\n", elf_errmsg (-1)); |
| 149 | exit (1); |
| 150 | } |
| 151 | |
| 152 | ehdr = elf32_getehdr (elf); |
| 153 | |
| 154 | phdr[0].p_offset = ehdr->e_phoff; |
| 155 | phdr[0].p_offset = ehdr->e_phoff; |
| 156 | phdr[0].p_vaddr = ehdr->e_phoff; |
| 157 | phdr[0].p_paddr = ehdr->e_phoff; |
| 158 | phdr[0].p_flags = PF_R | PF_X; |
| 159 | phdr[0].p_filesz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT); |
| 160 | phdr[0].p_memsz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT); |
| 161 | phdr[0].p_align = sizeof (Elf32_Word); |
| 162 | |
| 163 | /* Write out the file. */ |
| 164 | if (elf_update (elf, ELF_C_WRITE) < 0) |
| 165 | { |
| 166 | printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1)); |
| 167 | exit (1); |
| 168 | } |
| 169 | |
| 170 | /* We don't need the string table anymore. */ |
| 171 | ebl_strtabfree (shst); |
| 172 | |
| 173 | /* And the data allocated in the .shstrtab section. */ |
| 174 | free (data->d_buf); |
| 175 | |
| 176 | /* Print the ELF header values. */ |
| 177 | if (argc > 1) |
| 178 | { |
| 179 | for (i = 0; i < EI_NIDENT; ++i) |
| 180 | printf (" %02x", ehdr->e_ident[i]); |
| 181 | printf ("\ |
| 182 | \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n" |
| 183 | "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n" |
| 184 | "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n", |
| 185 | ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry, |
| 186 | ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize, |
| 187 | ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize, |
| 188 | ehdr->e_shnum, ehdr->e_shstrndx); |
| 189 | } |
| 190 | |
| 191 | if (elf_end (elf) != 0) |
| 192 | { |
| 193 | printf ("failure in elf_end: %s\n", elf_errmsg (-1)); |
| 194 | exit (1); |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |