diff options
Diffstat (limited to 'usr.bin/etdump/etdump.c')
| -rw-r--r-- | usr.bin/etdump/etdump.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/usr.bin/etdump/etdump.c b/usr.bin/etdump/etdump.c new file mode 100644 index 0000000..aedd53a --- /dev/null +++ b/usr.bin/etdump/etdump.c @@ -0,0 +1,269 @@ +/*- + * Copyright (c) 2018 iXsystems, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <err.h> +#include <getopt.h> +#include <libgen.h> +#include <stdbool.h> +#include <stdio.h> + +#include "cd9660.h" +#include "cd9660_eltorito.h" + +#include "etdump.h" + +const char * +system_id_string(u_char system_id) +{ + + switch (system_id) { + case ET_SYS_X86: + return ("i386"); + case ET_SYS_PPC: + return ("powerpc"); + case ET_SYS_MAC: + return ("mac"); + case ET_SYS_EFI: + return ("efi"); + default: + return ("invalid"); + } +} + +const char * +media_type_string(u_char media_type) +{ + + switch (media_type) { + case ET_MEDIA_NOEM: + return ("no emulation"); + case ET_MEDIA_12FDD: + return ("1.2MB FDD"); + case ET_MEDIA_144FDD: + return ("1.44MB FDD"); + case ET_MEDIA_288FDD: + return ("2.88MB FDD"); + case ET_MEDIA_HDD: + return ("HDD"); + default: + return ("invalid"); + } +} + +static int +read_sector(FILE *iso, daddr_t sector, char *buffer) +{ + + if (fseek(iso, sector * ISO_DEFAULT_BLOCK_SIZE, SEEK_SET) != 0) { + return (errno); + } + if (fread(buffer, ISO_DEFAULT_BLOCK_SIZE, 1, iso) != 1) { + return (errno); + } + return (0); +} + +static bool +boot_catalog_valid(char *entry) +{ + boot_catalog_validation_entry *ve; + int16_t checksum, sum; + unsigned char *csptr; + size_t i; + + ve = (boot_catalog_validation_entry *)entry; + + checksum = isonum_721(ve->checksum); + cd9660_721(0, ve->checksum); + csptr = (unsigned char *)ve; + + for (i = sum = 0; i < sizeof(*ve); i += 2) { + sum += (int16_t)csptr[i]; + sum += 256 * (int16_t)csptr[i + 1]; + } + if (sum + checksum != 0) { + return (false); + } + + cd9660_721(checksum, ve->checksum); + return (true); +} + +static int +dump_section(char *buffer, size_t offset, FILE *outfile, const char *filename, + struct outputter *outputter) +{ + boot_catalog_section_header *sh; + u_char platform_id; + int i; + size_t entry_offset; + boot_catalog_section_entry *entry; + + sh = (boot_catalog_section_header *)&buffer[offset]; + if (outputter->output_section != NULL) { + outputter->output_section(outfile, filename, sh); + } + + platform_id = sh->platform_id[0]; + + if (outputter->output_entry != NULL) { + for (i = 1; i <= (int)sh->num_section_entries[0]; i++) { + entry_offset = offset + i * ET_BOOT_ENTRY_SIZE; + entry = + (boot_catalog_section_entry *)&buffer[entry_offset]; + outputter->output_entry(outfile, filename, entry, + platform_id, false); + } + } + + return (1 + (int)sh->num_section_entries[0]); +} + +static void +dump_eltorito(FILE *iso, const char *filename, FILE *outfile, + struct outputter *outputter) +{ + char buffer[ISO_DEFAULT_BLOCK_SIZE], *entry; + boot_volume_descriptor *bvd; + daddr_t boot_catalog; + size_t offset; + int entry_count; + + if (read_sector(iso, 17, buffer) != 0) + err(1, "failed to read from image"); + + bvd = (boot_volume_descriptor *)buffer; + if (memcmp(bvd->identifier, ISO_VOLUME_DESCRIPTOR_STANDARD_ID, 5) != 0) + warnx("%s: not a valid ISO", filename); + if (bvd->boot_record_indicator[0] != ISO_VOLUME_DESCRIPTOR_BOOT) + warnx("%s: not an El Torito bootable ISO", filename); + if (memcmp(bvd->boot_system_identifier, ET_ID, 23) != 0) + warnx("%s: not an El Torito bootable ISO", filename); + + boot_catalog = isonum_731(bvd->boot_catalog_pointer); + + if (read_sector(iso, boot_catalog, buffer) != 0) + err(1, "failed to read from image"); + + entry = buffer; + offset = 0; + + if (!boot_catalog_valid(entry)) + warnx("%s: boot catalog checksum is invalid", filename); + + if (outputter->output_image != NULL) + outputter->output_image(outfile, filename, bvd); + + offset += ET_BOOT_ENTRY_SIZE; + entry = &buffer[offset]; + if (outputter->output_entry != NULL) + outputter->output_entry(outfile, filename, + (boot_catalog_section_entry *)entry, 0, true); + + offset += ET_BOOT_ENTRY_SIZE; + + while (offset < ISO_DEFAULT_BLOCK_SIZE) { + entry = &buffer[offset]; + + if ((uint8_t)entry[0] != ET_SECTION_HEADER_MORE && + (uint8_t)entry[0] != ET_SECTION_HEADER_LAST) + break; + + entry_count = dump_section(buffer, offset, outfile, filename, + outputter); + + offset += entry_count * ET_BOOT_ENTRY_SIZE; + } +} + +static void +usage(const char *progname) +{ + char *path; + + path = strdup(progname); + + fprintf(stderr, "usage: %s [-f format] [-o filename] filename [...]\n", + basename(path)); + fprintf(stderr, "\tsupported output formats: shell, text\n"); + exit(1); +} + +int +main(int argc, char **argv) +{ + int ch, i; + FILE *outfile, *iso; + struct outputter *outputter; + + outfile = stdout; + outputter = output_text; + + static struct option longopts[] = { + { "format", required_argument, NULL, 'f' }, + { "output", required_argument, NULL, 'o' }, + { NULL, 0, NULL, 0 }, + }; + + while ((ch = getopt_long(argc, argv, "f:o:", longopts, NULL)) != -1) { + switch (ch) { + case 'f': + if (strcmp(optarg, "shell") == 0) + outputter = output_shell; + else if (strcmp(optarg, "text") == 0) + outputter = output_text; + else + usage(argv[0]); + break; + case 'o': + if (strcmp(optarg, "-") == 0) { + outfile = stdout; + } else if ((outfile = fopen(optarg, "w")) == NULL) { + err(1, "unable to open %s for output", optarg); + } + break; + default: + usage(argv[0]); + } + } + + argc -= optind; + argv += optind; + + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "-") == 0) { + iso = stdin; + } else { + iso = fopen(argv[i], "r"); + if (iso == NULL) + err(1, "could not open %s", argv[1]); + } + dump_eltorito(iso, argv[i], outfile, outputter); + } +} |
