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 <err.h> 28 #include <getopt.h> 29 #include <libgen.h> 30 #include <stdbool.h> 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <errno.h> 35 #include <sys/queue.h> 36 37 #include <sys/fs/hsfs_isospec.h> 38 #include "cd9660_eltorito.h" 39 40 #include "etdump.h" 41 42 #define ISO_DEFAULT_BLOCK_SHIFT 11 43 #define ISO_DEFAULT_BLOCK_SIZE (1 << ISO_DEFAULT_BLOCK_SHIFT) 44 45 const char * 46 system_id_string(uchar_t system_id) 47 { 48 49 switch (system_id) { 50 case ET_SYS_X86: 51 return ("i386"); 52 case ET_SYS_PPC: 53 return ("powerpc"); 54 case ET_SYS_MAC: 55 return ("mac"); 56 case ET_SYS_EFI: 57 return ("efi"); 58 default: 59 return ("invalid"); 60 } 61 } 62 63 const char * 64 media_type_string(uchar_t media_type) 65 { 66 67 switch (media_type) { 68 case ET_MEDIA_NOEM: 69 return ("no emulation"); 70 case ET_MEDIA_12FDD: 71 return ("1.2MB FDD"); 72 case ET_MEDIA_144FDD: 73 return ("1.44MB FDD"); 74 case ET_MEDIA_288FDD: 75 return ("2.88MB FDD"); 76 case ET_MEDIA_HDD: 77 return ("HDD"); 78 default: 79 return ("invalid"); 80 } 81 } 82 83 static int 84 read_sector(FILE *iso, daddr_t sector, char *buffer) 85 { 86 87 fseek(iso, sector * ISO_DEFAULT_BLOCK_SIZE, SEEK_SET); 88 if (fread(buffer, ISO_DEFAULT_BLOCK_SIZE, 1, iso) != 1) { 89 return (errno); 90 } 91 return (0); 92 } 93 94 static bool 95 boot_catalog_valid(char *entry) 96 { 97 boot_catalog_validation_entry *ve; 98 int16_t checksum, sum; 99 unsigned char *csptr; 100 size_t i; 101 102 ve = (boot_catalog_validation_entry *)entry; 103 104 checksum = isonum_721(ve->checksum); 105 cd9660_721(0, ve->checksum); 106 csptr = (unsigned char *)ve; 107 108 for (i = sum = 0; i < sizeof (*ve); i += 2) { 109 sum += (int16_t)csptr[i]; 110 sum += 256 * (int16_t)csptr[i + 1]; 111 } 112 if (sum + checksum != 0) { 113 return (false); 114 } 115 116 cd9660_721(checksum, ve->checksum); 117 return (true); 118 } 119 120 static int 121 dump_section(char *buffer, size_t offset, FILE *outfile, const char *filename, 122 struct outputter *outputter) 123 { 124 boot_catalog_section_header *sh; 125 uchar_t platform_id; 126 int i; 127 size_t entry_offset; 128 boot_catalog_section_entry *entry; 129 130 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 entry = 141 (boot_catalog_section_entry *)&buffer[entry_offset]; 142 outputter->output_entry(outfile, filename, entry, 143 platform_id, false); 144 } 145 } 146 147 return (1 + (int)sh->num_section_entries[0]); 148 } 149 150 static void 151 dump_eltorito(FILE *iso, const char *filename, FILE *outfile, 152 struct outputter *outputter) 153 { 154 char buffer[ISO_DEFAULT_BLOCK_SIZE], *entry; 155 boot_volume_descriptor *bvd; 156 daddr_t boot_catalog; 157 size_t offset; 158 int entry_count; 159 160 if (read_sector(iso, 17, buffer) != 0) 161 err(1, "failed to read from image"); 162 163 bvd = (boot_volume_descriptor *)buffer; 164 if (memcmp(bvd->identifier, ISO_ID_STRING, 5) != 0) 165 warnx("%s: not a valid ISO", filename); 166 if (bvd->boot_record_indicator[0] != ISO_VD_BOOT) 167 warnx("%s: not an El Torito bootable ISO", filename); 168 if (memcmp(bvd->boot_system_identifier, ET_ID, 23) != 0) 169 warnx("%s: not an El Torito bootable ISO", filename); 170 171 boot_catalog = isonum_731(bvd->boot_catalog_pointer); 172 173 if (read_sector(iso, boot_catalog, buffer) != 0) 174 err(1, "failed to read from image"); 175 176 entry = buffer; 177 offset = 0; 178 179 if (!boot_catalog_valid(entry)) 180 warnx("%s: boot catalog checksum is invalid", filename); 181 182 if (outputter->output_image != NULL) 183 outputter->output_image(outfile, filename, bvd); 184 185 offset += ET_BOOT_ENTRY_SIZE; 186 entry = &buffer[offset]; 187 if (outputter->output_entry != NULL) 188 outputter->output_entry(outfile, filename, 189 (boot_catalog_section_entry *)entry, 0, true); 190 191 offset += ET_BOOT_ENTRY_SIZE; 192 193 while (offset < ISO_DEFAULT_BLOCK_SIZE) { 194 entry = &buffer[offset]; 195 196 if ((uint8_t)entry[0] != ET_SECTION_HEADER_MORE && 197 (uint8_t)entry[0] != ET_SECTION_HEADER_LAST) 198 break; 199 200 entry_count = dump_section(buffer, offset, outfile, filename, 201 outputter); 202 203 offset += entry_count * ET_BOOT_ENTRY_SIZE; 204 } 205 } 206 207 static void 208 usage(const char *progname) 209 { 210 char *path; 211 212 path = strdup(progname); 213 214 fprintf(stderr, "usage: %s [-f format] [-o filename] filename [...]\n", 215 basename(path)); 216 fprintf(stderr, "\tsupported output formats: shell, text\n"); 217 exit(1); 218 } 219 220 int 221 main(int argc, char **argv) 222 { 223 int ch, i; 224 FILE *outfile, *iso; 225 struct outputter *outputter; 226 227 outfile = stdout; 228 outputter = output_text; 229 230 static struct option longopts[] = { 231 { "format", required_argument, NULL, 'f' }, 232 { "output", required_argument, NULL, 'o' }, 233 { NULL, 0, NULL, 0 }, 234 }; 235 236 while ((ch = getopt_long(argc, argv, "f:o:", longopts, NULL)) != -1) { 237 switch (ch) { 238 case 'f': 239 if (strcmp(optarg, "shell") == 0) 240 outputter = output_shell; 241 else if (strcmp(optarg, "text") == 0) 242 outputter = output_text; 243 else 244 usage(argv[0]); 245 break; 246 case 'o': 247 if (strcmp(optarg, "-") == 0) { 248 outfile = stdout; 249 } else if ((outfile = fopen(optarg, "w")) == NULL) { 250 err(1, "unable to open %s for output", optarg); 251 } 252 break; 253 default: 254 usage(argv[0]); 255 } 256 } 257 258 argc -= optind; 259 argv += optind; 260 261 for (i = 0; i < argc; i++) { 262 if (strcmp(argv[i], "-") == 0) { 263 iso = stdin; 264 } else { 265 iso = fopen(argv[i], "r"); 266 if (iso == NULL) 267 err(1, "could not open %s", argv[1]); 268 } 269 dump_eltorito(iso, argv[i], outfile, outputter); 270 } 271 return (0); 272 } 273