1 /*- 2 * Copyright (c) 2018 iXsystems, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <err.h> 31 #include <getopt.h> 32 #include <libgen.h> 33 #include <stdbool.h> 34 #include <stdio.h> 35 36 #include "cd9660.h" 37 #include "cd9660_eltorito.h" 38 39 #include "etdump.h" 40 41 const char * 42 system_id_string(u_char system_id) 43 { 44 45 switch (system_id) { 46 case ET_SYS_X86: 47 return ("i386"); 48 case ET_SYS_PPC: 49 return ("powerpc"); 50 case ET_SYS_MAC: 51 return ("mac"); 52 case ET_SYS_EFI: 53 return ("efi"); 54 default: 55 return ("invalid"); 56 } 57 } 58 59 const char * 60 media_type_string(u_char media_type) 61 { 62 63 switch (media_type) { 64 case ET_MEDIA_NOEM: 65 return ("no emulation"); 66 case ET_MEDIA_12FDD: 67 return ("1.2MB FDD"); 68 case ET_MEDIA_144FDD: 69 return ("1.44MB FDD"); 70 case ET_MEDIA_288FDD: 71 return ("2.88MB FDD"); 72 case ET_MEDIA_HDD: 73 return ("HDD"); 74 default: 75 return ("invalid"); 76 } 77 } 78 79 static int 80 read_sector(FILE *iso, daddr_t sector, char *buffer) 81 { 82 83 if (fseek(iso, sector * ISO_DEFAULT_BLOCK_SIZE, SEEK_SET) != 0) { 84 return (errno); 85 } 86 if (fread(buffer, ISO_DEFAULT_BLOCK_SIZE, 1, iso) != 1) { 87 return (errno); 88 } 89 return (0); 90 } 91 92 static bool 93 boot_catalog_valid(char *entry) 94 { 95 boot_catalog_validation_entry *ve; 96 int16_t checksum, sum; 97 unsigned char *csptr; 98 size_t i; 99 100 ve = (boot_catalog_validation_entry *)entry; 101 102 checksum = isonum_721(ve->checksum); 103 cd9660_721(0, ve->checksum); 104 csptr = (unsigned char *)ve; 105 106 for (i = sum = 0; i < sizeof(*ve); i += 2) { 107 sum += (int16_t)csptr[i]; 108 sum += 256 * (int16_t)csptr[i + 1]; 109 } 110 if (sum + checksum != 0) { 111 return (false); 112 } 113 114 cd9660_721(checksum, ve->checksum); 115 return (true); 116 } 117 118 static int 119 dump_section(char *buffer, size_t bufsize, size_t offset, FILE *outfile, 120 const char *filename, struct outputter *outputter) 121 { 122 boot_catalog_section_header *sh; 123 u_char platform_id; 124 int i; 125 size_t entry_offset; 126 boot_catalog_section_entry *entry; 127 128 if (offset + sizeof(boot_catalog_section_header) > bufsize) 129 errx(1, "%s: section header out of bounds", filename); 130 sh = (boot_catalog_section_header *)&buffer[offset]; 131 if (outputter->output_section != NULL) { 132 outputter->output_section(outfile, filename, sh); 133 } 134 135 platform_id = sh->platform_id[0]; 136 137 if (outputter->output_entry != NULL) { 138 for (i = 1; i <= (int)sh->num_section_entries[0]; i++) { 139 entry_offset = offset + i * ET_BOOT_ENTRY_SIZE; 140 if (entry_offset + sizeof(boot_catalog_section_entry) > 141 bufsize) 142 errx(1, "%s: section entry out of bounds", 143 filename); 144 entry = 145 (boot_catalog_section_entry *)&buffer[entry_offset]; 146 outputter->output_entry(outfile, filename, entry, 147 platform_id, false); 148 } 149 } 150 151 return (1 + (int)sh->num_section_entries[0]); 152 } 153 154 static void 155 dump_eltorito(FILE *iso, const char *filename, FILE *outfile, 156 struct outputter *outputter) 157 { 158 char buffer[ISO_DEFAULT_BLOCK_SIZE], *entry; 159 boot_volume_descriptor *bvd; 160 daddr_t boot_catalog; 161 size_t offset; 162 int entry_count; 163 164 if (read_sector(iso, 17, buffer) != 0) 165 err(1, "failed to read from image"); 166 167 bvd = (boot_volume_descriptor *)buffer; 168 if (memcmp(bvd->identifier, ISO_VOLUME_DESCRIPTOR_STANDARD_ID, 5) != 0) 169 warnx("%s: not a valid ISO", filename); 170 if (bvd->boot_record_indicator[0] != ISO_VOLUME_DESCRIPTOR_BOOT || 171 memcmp(bvd->boot_system_identifier, ET_ID, 23) != 0) 172 warnx("%s: not an El Torito bootable ISO", filename); 173 174 boot_catalog = isonum_731(bvd->boot_catalog_pointer); 175 176 if (read_sector(iso, boot_catalog, buffer) != 0) 177 err(1, "failed to read from image"); 178 179 entry = buffer; 180 offset = 0; 181 182 if (!boot_catalog_valid(entry)) 183 warnx("%s: boot catalog checksum is invalid", filename); 184 185 if (outputter->output_image != NULL) 186 outputter->output_image(outfile, filename, bvd); 187 188 offset += ET_BOOT_ENTRY_SIZE; 189 entry = &buffer[offset]; 190 if (outputter->output_entry != NULL) 191 outputter->output_entry(outfile, filename, 192 (boot_catalog_section_entry *)entry, 0, true); 193 194 offset += ET_BOOT_ENTRY_SIZE; 195 196 while (offset < ISO_DEFAULT_BLOCK_SIZE) { 197 entry = &buffer[offset]; 198 199 if ((uint8_t)entry[0] != ET_SECTION_HEADER_MORE && 200 (uint8_t)entry[0] != ET_SECTION_HEADER_LAST) 201 break; 202 203 entry_count = dump_section(buffer, sizeof(buffer), offset, 204 outfile, filename, outputter); 205 206 offset += entry_count * ET_BOOT_ENTRY_SIZE; 207 } 208 } 209 210 static void 211 usage(const char *progname) 212 { 213 char *path; 214 215 path = strdup(progname); 216 217 fprintf(stderr, "usage: %s [-f format] [-o filename] filename [...]\n", 218 basename(path)); 219 fprintf(stderr, "\tsupported output formats: shell, text\n"); 220 exit(1); 221 } 222 223 int 224 main(int argc, char **argv) 225 { 226 int ch, i; 227 FILE *outfile, *iso; 228 struct outputter *outputter; 229 230 outfile = stdout; 231 outputter = output_text; 232 233 static struct option longopts[] = { 234 { "format", required_argument, NULL, 'f' }, 235 { "output", required_argument, NULL, 'o' }, 236 { NULL, 0, NULL, 0 }, 237 }; 238 239 while ((ch = getopt_long(argc, argv, "f:o:", longopts, NULL)) != -1) { 240 switch (ch) { 241 case 'f': 242 if (strcmp(optarg, "shell") == 0) 243 outputter = output_shell; 244 else if (strcmp(optarg, "text") == 0) 245 outputter = output_text; 246 else 247 usage(argv[0]); 248 break; 249 case 'o': 250 if (strcmp(optarg, "-") == 0) { 251 outfile = stdout; 252 } else if ((outfile = fopen(optarg, "w")) == NULL) { 253 err(1, "unable to open %s for output", optarg); 254 } 255 break; 256 default: 257 usage(argv[0]); 258 } 259 } 260 261 argc -= optind; 262 argv += optind; 263 264 for (i = 0; i < argc; i++) { 265 if (strcmp(argv[i], "-") == 0) { 266 iso = stdin; 267 } else { 268 iso = fopen(argv[i], "r"); 269 if (iso == NULL) 270 err(1, "could not open %s", argv[i]); 271 } 272 dump_eltorito(iso, argv[i], outfile, outputter); 273 } 274 } 275