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get_gpt.c
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get_gpt.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "pt-mbr.h"
#include "pt-gpt.h"
static off_t extended_partition_lba_offset; /* 扩展分区的LAB地址 */
static void print_gpt_partition(int fd, const uint8_t *mbr);
static void print_gpt_partition_entry(const struct gpt_entry *gpt, int index);
static void print_dos_partition(int fd, uint8_t *mbr);
static void print_dos_subextended_partition(int fd, off_t start_lba_sector);
int main(int argc, const char *argv[])
{
if (argc != 2) {
(void)fprintf(stderr, "Usage: %s + disk_name\n", argv[0]);
exit(EXIT_FAILURE);
}
int fd;
int result = 0;
uint8_t mbr[512]; /* master boot record buffer */
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
perror("open");
exit(EXIT_FAILURE);
}
if (read(fd, mbr, sizeof(mbr)) != sizeof(mbr)) {
perror("read");
result = -1;
goto out;
}
if (mbr_is_valid_magic(mbr) == 0) {
(void)fprintf(stderr, "Illegal mbr!!!\n");
result = -2;
goto out;
}
struct dos_partition *p = mbr_get_partition(mbr, 0);
if (p->sys_ind == MBR_GPT_PARTITION) {
print_gpt_partition(fd, mbr);
} else {
print_dos_partition(fd, mbr);
}
out:
if (fd) {
(void)close(fd);
}
return (result);
}
static void print_gpt_partition_entry(const struct gpt_entry *gpt, int index)
{
printf(" [%3d] ", index);
char buf[128];
// type
(void)snprintf(buf, sizeof(buf), "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
gpt->type.time_low, gpt->type.time_mid, gpt->type.time_hi_and_version,
gpt->type.clock_seq_hi, gpt->type.clock_seq_low,
gpt->type.node[0], gpt->type.node[1], gpt->type.node[2],
gpt->type.node[3], gpt->type.node[4], gpt->type.node[5]);
printf("%s", buf);
// if (strcmp(buf, GPT_DEFAULT_ENTRY_TYPE) == 0) {
// printf("Linux native partition type");
// }
// partition_guid
(void)snprintf(buf, sizeof(buf), "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
gpt->partition_guid.time_low, gpt->partition_guid.time_mid, gpt->partition_guid.time_hi_and_version,
gpt->partition_guid.clock_seq_hi, gpt->partition_guid.clock_seq_low,
gpt->partition_guid.node[0], gpt->partition_guid.node[1], gpt->partition_guid.node[2],
gpt->partition_guid.node[3], gpt->partition_guid.node[4], gpt->partition_guid.node[5]);
printf(" %s", buf);
// lba_start
printf("%10llu", gpt_partition_get_lab_start(gpt));
// lba_end
printf("%16llu", gpt_partition_get_lba_end(gpt));
//
printf("%13llu ", (gpt_partition_get_lba_end(gpt) - gpt_partition_get_lab_start(gpt) + 1) * 512);
// name
const uint16_t *p = gpt->name;
for ( ;; ) {
const char c = (const char )*p;
if (c == '\0') break;
printf("%c", c);
p++;
}
}
static void print_gpt_partition(int fd, const uint8_t *mbr)
{
printf("Protective MBR:\n");
printf(" Type: GPT Partition\n\n");
struct gpt_header gpthdr;
int i;
if (read(fd, &gpthdr, sizeof(gpthdr)) != sizeof(gpthdr)) {
perror("read");
return;
}
if (gpthdr.signature != GPT_HEADER_SIGNATURE) {
fprintf(stderr, "Wrong GPT signature\n");
return;
}
printf("GPT Header:\n");
printf(" Signature: EFI PART\n");
printf(" Version: 0x%08x\n", gpthdr.revision);
printf(" Hdr Size: %u\n", gpthdr.size);
printf(" Hdr Crc32: 0x%08x\n", gpthdr.crc32);
printf(" Reserved: 0x%08x\n", gpthdr.reserved1);
printf(" Hdr Start LBA: %llu\n", gpthdr.my_lba);
printf(" Backup Hdr Start LBA: %llu\n", gpthdr.alternative_lba);
printf(" Partition Start LBA: %llu\n", gpthdr.first_usable_lba);
printf(" Partition End LBA: %llu\n", gpthdr.last_usable_lba);
printf(" GUID: %08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X\n",
gpthdr.disk_guid.time_low, gpthdr.disk_guid.time_mid,
gpthdr.disk_guid.time_hi_and_version,
gpthdr.disk_guid.clock_seq_hi, gpthdr.disk_guid.clock_seq_low,
gpthdr.disk_guid.node[0], gpthdr.disk_guid.node[1],
gpthdr.disk_guid.node[2], gpthdr.disk_guid.node[3],
gpthdr.disk_guid.node[4], gpthdr.disk_guid.node[5]);
printf(" Partition Table Start LBA: %llu\n", gpthdr.partition_entry_lba);
printf(" Number of Partition Entry: %u\n", gpthdr.npartition_entries);
printf(" Size of Partition Entry: %u\n", gpthdr.sizeof_partition_entry);
printf(" Partition Table Crc32: 0x%08x\n", gpthdr.partition_entry_array_crc32);
printf(" Reserved2 must be all 0\n");
printf("\n");
uint8_t buf[gpthdr.npartition_entries * gpthdr.sizeof_partition_entry];
if (read(fd, buf, sizeof(buf)) != sizeof(buf)) {
perror("read");
return;
}
printf("Partition Table:\n");
printf(" [ Nr] Partition Type GUID Unique Partition Guid Start(sector) End(sector) Size Name\n");
for (i = 0; i < gpthdr.npartition_entries; i++) {
const struct gpt_entry *gpt = gpt_get_partition(buf, i);
if (memcmp(&gpt->type, &GPT_UNUSED_ENTRY_GUID, sizeof(struct gpt_guid)) == 0) continue;
print_gpt_partition_entry(gpt, i);
printf("\n");
}
}
static void print_extend(int fd, off_t start_lba_sector)
{
unsigned char ebr[512]; /* extended boot record buffer */
off_t offset = start_lba_sector * 512;
(void)lseek(fd, offset, SEEK_SET);
if (read(fd, ebr, sizeof(ebr)) != sizeof(ebr)) {
perror("read extended");
return;
}
struct dos_partition *p = mbr_get_partition(ebr, 0);
printf(" %02x %4u/%3hhu/%2hhu ~ %4u/%3hhu/%2hhu %8u %8u %02x\n",
p->boot_ind,
chs_get_cylinder(p->bc, p->bs), p->bh, chs_get_sector(p->bs),
chs_get_cylinder(p->ec, p->es), p->eh, chs_get_sector(p->es),
dos_partition_get_start(p) , // + (unsigned int)start_lba_sector, /* 每个子扩展分区都把自己看成独立的硬盘 */
dos_partition_get_size(p),
p->sys_ind);
p = mbr_get_partition(ebr, 1); /* EBR中分区表表项二是描述下个子扩展分区的位置的 */
if (IS_EXTENDED(p->sys_ind)) {
// printf("\tnext logic info: %02x %02x %u/%hhu/%hhu ~ %u/%hhu/%hhu %u(%u)\n",
// p->sys_ind, p->boot_ind,
// chs_get_cylinder(p->bc, p->bs), p->bh, chs_get_sector(p->bs),
// chs_get_cylinder(p->ec, p->es), p->eh, chs_get_sector(p->es),
// dos_partition_get_start(p),
// dos_partition_get_size(p));
} else { /* 后续没有逻辑分区了，以此来结束递归 */
// printf("no logic anymore\n");
return;
}
print_extend(fd, extended_partition_lba_offset + dos_partition_get_start(p)); /* 第二个分区表项中的start是针对整个扩展分区的 */
}
static void print_dos_partition(int fd, uint8_t *mbr)
{
int i;
printf("Disk identifier: 0x%08x\n\n", mbr_get_id(mbr));
printf("Boot Start-C/H/S ~ End-C/H/S Start-LBA Size Type\n");
for (i = 0; i < 4; i++) {
struct dos_partition *p = mbr_get_partition(mbr, i);
if (dos_partition_get_start(p) == 0U) continue;
printf(" %02x %4u/%3hhu/%2hhu ~ %4u/%3hhu/%2hhu %8u %8u %02x\n",
p->boot_ind,
chs_get_cylinder(p->bc, p->bs), p->bh, chs_get_sector(p->bs),
chs_get_cylinder(p->ec, p->es), p->eh, chs_get_sector(p->es),
dos_partition_get_start(p),
dos_partition_get_size(p),
p->sys_ind);
if (IS_EXTENDED(p->sys_ind)) { /* extended partition */
extended_partition_lba_offset = dos_partition_get_start(p);
print_extend(fd, extended_partition_lba_offset); /* 从extended_partition_lba_offset扇区处开始读扩展分区信息 */
}
}
}