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// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cgpt.h"
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "cgptlib_internal.h"
#include "endian.h"
static void Usage(void)
{
printf("\nUsage: %s boot [OPTIONS] DRIVE\n\n"
"Edit the PMBR sector for legacy BIOSes\n\n"
"Options:\n"
" -i NUM Set bootable partition\n"
" -b FILE Install bootloader code in the PMBR\n"
" -p Create legacy PMBR partition table\n"
"\n"
"With no options, it will just print the PMBR boot guid\n"
"\n", progname);
}
int cmd_boot(int argc, char *argv[]) {
struct drive drive;
uint32_t partition = 0;
char *bootfile = 0;
int create_pmbr = 0;
int retval = 1;
int gpt_retval;
int c;
int errorcnt = 0;
char *e = 0;
opterr = 0; // quiet, you
while ((c=getopt(argc, argv, ":hi:b:p")) != -1)
{
switch (c)
{
case 'i':
partition = (uint32_t)strtoul(optarg, &e, 0);
if (!*optarg || (e && *e))
{
Error("invalid argument to -%c: \"%s\"\n", c, optarg);
errorcnt++;
}
break;
case 'b':
bootfile = optarg;
break;
case 'p':
create_pmbr = 1;
break;
case 'h':
Usage();
return CGPT_OK;
case '?':
Error("unrecognized option: -%c\n", optopt);
errorcnt++;
break;
case ':':
Error("missing argument to -%c\n", optopt);
errorcnt++;
break;
default:
errorcnt++;
break;
}
}
if (errorcnt)
{
Usage();
return CGPT_FAILED;
}
if (optind >= argc) {
Error("missing drive argument\n");
return CGPT_FAILED;
}
if (CGPT_OK != DriveOpen(argv[optind], &drive))
return CGPT_FAILED;
if (CGPT_OK != ReadPMBR(&drive)) {
Error("Unable to read PMBR\n");
goto done;
}
if (create_pmbr) {
drive.pmbr.magic[0] = 0x1d;
drive.pmbr.magic[1] = 0x9a;
drive.pmbr.sig[0] = 0x55;
drive.pmbr.sig[1] = 0xaa;
memset(&drive.pmbr.part, 0, sizeof(drive.pmbr.part));
drive.pmbr.part[0].f_head = 0x00;
drive.pmbr.part[0].f_sect = 0x02;
drive.pmbr.part[0].f_cyl = 0x00;
drive.pmbr.part[0].type = 0xee;
drive.pmbr.part[0].l_head = 0xff;
drive.pmbr.part[0].l_sect = 0xff;
drive.pmbr.part[0].l_cyl = 0xff;
drive.pmbr.part[0].f_lba = htole32(1);
uint32_t max = 0xffffffff;
if (drive.gpt.drive_sectors < 0xffffffff)
max = drive.gpt.drive_sectors - 1;
drive.pmbr.part[0].num_sect = htole32(max);
}
if (partition) {
if (GPT_SUCCESS != (gpt_retval = GptSanityCheck(&drive.gpt))) {
Error("GptSanityCheck() returned %d: %s\n",
gpt_retval, GptError(gpt_retval));
goto done;
}
if (partition > GetNumberOfEntries(&drive.gpt)) {
Error("invalid partition number: %d\n", partition);
goto done;
}
uint32_t index = partition - 1;
GptEntry *entry = GetEntry(&drive.gpt, ANY_VALID, index);
memcpy(&drive.pmbr.boot_guid, &entry->unique, sizeof(Guid));
}
if (bootfile) {
int fd = open(bootfile, O_RDONLY);
if (fd < 0) {
Error("Can't read %s: %s\n", bootfile, strerror(errno));
goto done;
}
int n = read(fd, drive.pmbr.bootcode, sizeof(drive.pmbr.bootcode));
if (n < 1) {
Error("problem reading %s: %s\n", bootfile, strerror(errno));
close(fd);
goto done;
}
close(fd);
}
char buf[GUID_STRLEN];
GuidToStr(&drive.pmbr.boot_guid, buf, sizeof(buf));
printf("%s\n", buf);
// Write it all out
if (CGPT_OK == WritePMBR(&drive))
retval = 0;
done:
(void) DriveClose(&drive, 1);
return retval;
}
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