This can be used to check existing images but will be used in the future to find EFI ESP images placed in El Torito catalogs so they can be used for hybrid boot purposes. Reviewed by: imp (code), sbruno (man page), bcr (man page) Sponsored by: iXsystems, Inc. Differential Revision: https://reviews.freebsd.org/D14952
269 lines
6.6 KiB
C
269 lines
6.6 KiB
C
/*-
|
|
* 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)
|
|
{
|
|
|
|
fseek(iso, sector * ISO_DEFAULT_BLOCK_SIZE, SEEK_SET);
|
|
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++) {
|
|
printf("%d %s\n", optind, argv[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);
|
|
}
|
|
}
|