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eltorito.c
250 lines (199 loc) · 10.1 KB
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eltorito.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <inttypes.h>
#include "disk.h"
#include "filesystem.h"
#include "util.h"
#include "json.h"
#include "eltorito.h"
#define ISO_MAGIC "\001CD001\001"
#define ELTORITO_MAGIC "\000CD001\001EL TORITO SPECIFICATION"
// generate output as if we have 512 byte block size
// set to 0 or 2
#define BLK_FIX 2
static void dump_bootinfo(disk_t *disk, uint64_t sector);
void dump_eltorito(disk_t *disk)
{
int i, j;
unsigned char buf[disk->block_size = 0x800];
unsigned char zero[32];
unsigned catalog;
eltorito_t *el;
char *s;
static char *bt[] = {
"no emulation", "1.2MB floppy", "1.44MB floppy", "2.88MB floppy", "hard disk", ""
};
memset(zero, 0, sizeof zero);
i = disk_read(disk, buf, 0x10, 1);
if(i || memcmp(buf, ISO_MAGIC, sizeof ISO_MAGIC - 1)) return;
i = disk_read(disk, buf, 0x11, 1);
if(i || memcmp(buf, ELTORITO_MAGIC, sizeof ELTORITO_MAGIC - 1)) {
return;
}
json_object *json_eltorito = json_object_new_object();
json_object_object_add(disk->json_disk, "eltorito", json_eltorito);
catalog = le32toh(* (uint32_t *) (buf + 0x47));
log_info(SEP "\nel torito:\n");
json_object_object_add(json_eltorito, "block_size", json_object_new_int(disk->block_size >> BLK_FIX));
log_info(" sector size: %d\n", disk->block_size >> BLK_FIX);
json_object_object_add(json_eltorito, "catalog_lba", json_object_new_int(catalog << BLK_FIX));
log_info(" boot catalog: %u\n", catalog << BLK_FIX);
json_object *json_table = json_object_new_array();
json_object_object_add(json_eltorito, "catalog", json_table);
i = disk_read(disk, buf, catalog, 1);
if(i) return;
for(i = 0; i < disk->block_size/32; i++) {
el = (eltorito_t *) (buf + 32 * i);
if(!memcmp(buf + 32 * i, zero, 32)) continue;
json_object *json_entry = json_object_new_object();
json_object_array_add(json_table, json_entry);
json_object_object_add(json_entry, "index", json_object_new_int64(i));
json_object_object_add(json_entry, "type_id", json_object_new_int64(el->any.header_id));
switch(el->any.header_id) {
case 0x01:
json_object_object_add(json_entry, "type_name", json_object_new_string("validation entry"));
log_info(" %-3d type 0x%02x (validation entry)\n", i, el->validation.header_id);
uint16_t sum;
for(sum = j = 0; j < 16; j++) {
sum += buf[32 * i + 2 * j] + (buf[32 * i + 2 * j + 1] << 8);
}
uint16_t crc_value = le16toh(el->validation.crc);
json_object_object_add(json_entry, "platform_id", json_object_new_int64(el->section.platform_id));
log_info(" platform id 0x%02x", el->validation.platform_id);
j = le16toh(el->validation.magic);
json_object_object_add(json_entry, "magic_ok", json_object_new_boolean(j == 0xaa55));
log_info(", crc 0x%04x (%s)", crc_value - sum, sum ? "wrong" : "ok");
log_info(", magic %s\n", j == 0xaa55 ? "ok" : "wrong");
json_object *json_crc = json_object_new_object();
json_object_object_add(json_entry, "crc", json_crc);
json_object_object_add(json_crc, "stored", json_object_new_format("0x%04x", crc_value));
json_object_object_add(json_crc, "calculated", json_object_new_format("0x%04x", crc_value - sum));
json_object_object_add(json_crc, "ok", json_object_new_boolean(sum == 0));
s = cname(el->validation.name, sizeof el->validation.name);
if(*s) json_object_object_add(json_entry, "manufacturer", json_object_new_string(s));
log_info(" manufacturer[%d] \"%s\"\n", (int) strlen(s), s);
break;
case 0x44:
json_object_object_add(json_entry, "type_name", json_object_new_string("section entry extension"));
json_object_object_add(json_entry, "info", json_object_new_int64(el->extension.info));
log_info(" %-3d type 0x%02x (section entry extension)\n", i, el->any.header_id);
log_info(" info 0x%02x\n", el->extension.info);
break;
case 0x00:
case 0x88:
json_object_object_add(json_entry, "type_name", json_object_new_string("initial/default entry"));
json_object_object_add(json_entry, "boot", json_object_new_boolean(el->any.header_id));
log_info(" %-3d%c type 0x%02x (initial/default entry)\n", i, el->any.header_id ? '*' : ' ', el->any.header_id);
json_object_object_add(json_entry, "media_id", json_object_new_int64(el->entry.media));
s = bt[el->entry.media < 5 ? el->entry.media : 5];
if(*s) json_object_object_add(json_entry, "media_type", json_object_new_string(s));
log_info(" boot type %d (%s)\n", el->entry.media, s);
json_object_object_add(json_entry, "load_address", json_object_new_int64(le16toh(el->entry.load_segment) << 4));
log_info(" load address 0x%05x", le16toh(el->entry.load_segment) << 4);
json_object_object_add(json_entry, "system_type", json_object_new_int64(el->entry.system));
log_info(", system type 0x%02x\n", el->entry.system);
json_object_object_add(json_entry, "first_lba", json_object_new_int64(le32toh(el->entry.start) << BLK_FIX));
json_object_object_add(json_entry, "size", json_object_new_int64(le16toh(el->entry.size)));
log_info(" start %d, size %d%s",
le32toh(el->entry.start) << BLK_FIX,
le16toh(el->entry.size),
BLK_FIX ? "" : "/4"
);
if((s = iso_block_to_name(disk, le32toh(el->entry.start) << 2, NULL))) {
json_object_object_add(json_entry, "file_name", json_object_new_string(s));
log_info(", \"%s\"", s);
}
json_object_object_add(json_entry, "criteria_type", json_object_new_int64(el->entry.criteria));
s = cname(el->entry.name, sizeof el->entry.name);
if(*s) json_object_object_add(json_entry, "criteria_string", json_object_new_string(s));
log_info("\n selection criteria 0x%02x \"%s\"\n", el->entry.criteria, s);
disk->json_current = json_entry;
unsigned old_block_size = disk->block_size;
disk->block_size = 512;
dump_bootinfo(disk, le32toh(el->entry.start) << BLK_FIX);
dump_fs(disk, 7, le32toh(el->entry.start) << BLK_FIX);
disk->block_size = old_block_size;
disk->json_current = disk->json_disk;
break;
case 0x90:
case 0x91:
json_object_object_add(json_entry, "type_name",
json_object_new_string(el->any.header_id == 0x91 ? "last section header" : "section header")
);
log_info(
" %-3d type 0x%02x (%ssection header)\n",
i,
el->any.header_id,
el->any.header_id == 0x91 ? "last " : ""
);
json_object_object_add(json_entry, "platform_id", json_object_new_int64(el->section.platform_id));
log_info(" platform id 0x%02x", el->section.platform_id);
s = cname(el->section.name, sizeof el->section.name);
json_object_object_add(json_entry, "name", json_object_new_string(s));
log_info(", name[%d] \"%s\"\n", (int) strlen(s), s);
json_object_object_add(json_entry, "entries", json_object_new_int64(el->section.entries));
log_info(" entries %d\n", le16toh(el->section.entries));
break;
default:
log_info(" %-3d type 0x%02x\n", i, el->any.header_id);
break;
}
}
}
static void dump_bootinfo(disk_t *disk, uint64_t sector)
{
unsigned char buf[disk->block_size];
unsigned char pvd[disk->block_size];
unsigned char grub_info[disk->block_size];
if(disk->block_size < 0x200) return;
if(disk_read(disk, buf, sector, 1)) return;
unsigned bi_pvd = read_dword_le(buf + 8) << BLK_FIX;
unsigned bi_start = read_dword_le(buf + 12) << BLK_FIX;
unsigned bi_size = read_dword_le(buf + 16);
unsigned bi_crc = read_dword_le(buf + 20);
if((uint64_t) bi_pvd * disk->block_size > disk->size_in_bytes + disk->block_size) return;
if(disk_read(disk, pvd, bi_pvd, 1)) return;
if(memcmp(pvd, ISO_MAGIC, sizeof ISO_MAGIC - 1)) return;
unsigned file_size = -1u;
iso_block_to_name(disk, sector, &file_size);
unsigned crc = 0;
if(file_size == bi_size) {
for(unsigned u = 64, block_nr = sector; u < file_size; u += 4) {
if(u && !(u % disk->block_size)) {
if(disk_read(disk, buf, ++block_nr, 1)) break;
}
crc += read_dword_le(buf + u % disk->block_size);
}
}
uint64_t grub_lba = 0;
if(disk->grub_used && !disk_read(disk, grub_info, sector + 4, 1)) {
grub_lba = read_qword_le(grub_info + 0x1f4);
}
log_info(" boot info table:\n");
log_info(" volume descriptor %u\n", bi_pvd);
log_info(" start %u (%s)\n", bi_start, bi_start == sector ? "ok" : "wrong");
log_info(" size %u (%s)\n", bi_size, bi_size == file_size ? "ok" : "wrong");
log_info(" crc 0x%08x (%s)\n", bi_crc, bi_crc == crc ? "ok" : "wrong");
if(disk->grub_used) {
log_info(" grub start %"PRIu64" (%s)\n", grub_lba, grub_lba == sector + 5 ? "ok" : "wrong");
}
json_object *json_fs = json_object_new_object();
json_object_object_add(disk->json_current, "boot_info_table", json_fs);
json_object_object_add(json_fs, "volume_descriptor_lba", json_object_new_int64(bi_pvd));
json_object_object_add(json_fs, "file_lba", json_object_new_int64(bi_start));
json_object_object_add(json_fs, "file_lba_ok", json_object_new_boolean(bi_start == sector));
json_object_object_add(json_fs, "file_size", json_object_new_int64(bi_size));
json_object_object_add(json_fs, "file_size_ok", json_object_new_boolean(bi_size == file_size));
if(disk->grub_used) {
json_object_object_add(json_fs, "grub_lba", json_object_new_int64(grub_lba));
json_object_object_add(json_fs, "grub_lba_ok", json_object_new_boolean(grub_lba == sector + 5));
}
json_object *json_crc = json_object_new_object();
json_object_object_add(json_fs, "crc", json_crc);
json_object_object_add(json_crc, "stored", json_object_new_format("0x%08x", bi_crc));
json_object_object_add(json_crc, "calculated", json_object_new_format("0x%08x", crc));
json_object_object_add(json_crc, "ok", json_object_new_boolean(bi_crc == crc));
}
#undef BLK_FIX