2 * Copyright (c) 2018 iXsystems, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
37 #include "cd9660_eltorito.h"
42 system_id_string(u_char system_id)
60 media_type_string(u_char media_type)
65 return ("no emulation");
69 return ("1.44MB FDD");
71 return ("2.88MB FDD");
80 read_sector(FILE *iso, daddr_t sector, char *buffer)
83 if (fseek(iso, sector * ISO_DEFAULT_BLOCK_SIZE, SEEK_SET) != 0) {
86 if (fread(buffer, ISO_DEFAULT_BLOCK_SIZE, 1, iso) != 1) {
93 boot_catalog_valid(char *entry)
95 boot_catalog_validation_entry *ve;
96 int16_t checksum, sum;
100 ve = (boot_catalog_validation_entry *)entry;
102 checksum = isonum_721(ve->checksum);
103 cd9660_721(0, ve->checksum);
104 csptr = (unsigned char *)ve;
106 for (i = sum = 0; i < sizeof(*ve); i += 2) {
107 sum += (int16_t)csptr[i];
108 sum += 256 * (int16_t)csptr[i + 1];
110 if (sum + checksum != 0) {
114 cd9660_721(checksum, ve->checksum);
119 dump_section(char *buffer, size_t offset, FILE *outfile, const char *filename,
120 struct outputter *outputter)
122 boot_catalog_section_header *sh;
126 boot_catalog_section_entry *entry;
128 sh = (boot_catalog_section_header *)&buffer[offset];
129 if (outputter->output_section != NULL) {
130 outputter->output_section(outfile, filename, sh);
133 platform_id = sh->platform_id[0];
135 if (outputter->output_entry != NULL) {
136 for (i = 1; i <= (int)sh->num_section_entries[0]; i++) {
137 entry_offset = offset + i * ET_BOOT_ENTRY_SIZE;
139 (boot_catalog_section_entry *)&buffer[entry_offset];
140 outputter->output_entry(outfile, filename, entry,
145 return (1 + (int)sh->num_section_entries[0]);
149 dump_eltorito(FILE *iso, const char *filename, FILE *outfile,
150 struct outputter *outputter)
152 char buffer[ISO_DEFAULT_BLOCK_SIZE], *entry;
153 boot_volume_descriptor *bvd;
154 daddr_t boot_catalog;
158 if (read_sector(iso, 17, buffer) != 0)
159 err(1, "failed to read from image");
161 bvd = (boot_volume_descriptor *)buffer;
162 if (memcmp(bvd->identifier, ISO_VOLUME_DESCRIPTOR_STANDARD_ID, 5) != 0)
163 warnx("%s: not a valid ISO", filename);
164 if (bvd->boot_record_indicator[0] != ISO_VOLUME_DESCRIPTOR_BOOT)
165 warnx("%s: not an El Torito bootable ISO", filename);
166 if (memcmp(bvd->boot_system_identifier, ET_ID, 23) != 0)
167 warnx("%s: not an El Torito bootable ISO", filename);
169 boot_catalog = isonum_731(bvd->boot_catalog_pointer);
171 if (read_sector(iso, boot_catalog, buffer) != 0)
172 err(1, "failed to read from image");
177 if (!boot_catalog_valid(entry))
178 warnx("%s: boot catalog checksum is invalid", filename);
180 if (outputter->output_image != NULL)
181 outputter->output_image(outfile, filename, bvd);
183 offset += ET_BOOT_ENTRY_SIZE;
184 entry = &buffer[offset];
185 if (outputter->output_entry != NULL)
186 outputter->output_entry(outfile, filename,
187 (boot_catalog_section_entry *)entry, 0, true);
189 offset += ET_BOOT_ENTRY_SIZE;
191 while (offset < ISO_DEFAULT_BLOCK_SIZE) {
192 entry = &buffer[offset];
194 if ((uint8_t)entry[0] != ET_SECTION_HEADER_MORE &&
195 (uint8_t)entry[0] != ET_SECTION_HEADER_LAST)
198 entry_count = dump_section(buffer, offset, outfile, filename,
201 offset += entry_count * ET_BOOT_ENTRY_SIZE;
206 usage(const char *progname)
210 path = strdup(progname);
212 fprintf(stderr, "usage: %s [-f format] [-o filename] filename [...]\n",
214 fprintf(stderr, "\tsupported output formats: shell, text\n");
219 main(int argc, char **argv)
223 struct outputter *outputter;
226 outputter = output_text;
228 static struct option longopts[] = {
229 { "format", required_argument, NULL, 'f' },
230 { "output", required_argument, NULL, 'o' },
231 { NULL, 0, NULL, 0 },
234 while ((ch = getopt_long(argc, argv, "f:o:", longopts, NULL)) != -1) {
237 if (strcmp(optarg, "shell") == 0)
238 outputter = output_shell;
239 else if (strcmp(optarg, "text") == 0)
240 outputter = output_text;
245 if (strcmp(optarg, "-") == 0) {
247 } else if ((outfile = fopen(optarg, "w")) == NULL) {
248 err(1, "unable to open %s for output", optarg);
259 for (i = 0; i < argc; i++) {
260 if (strcmp(argv[i], "-") == 0) {
263 iso = fopen(argv[i], "r");
265 err(1, "could not open %s", argv[1]);
267 dump_eltorito(iso, argv[i], outfile, outputter);