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openwrt/tools/firmware-utils/src/ptgen.c
Daniel Golle 313649decf firmware-utils/ptgen: remove unused variable assignment 
Discovered by coverty:

 CID 1473630:  Code maintainability issues  (UNUSED_VALUE)

 Assigning value from "type_to_guid_and_name(type, &name)" to
 "part_guid" here, but that stored value is overwritten before it can
 be used.

Remove the now redundant assignment of part_guid which is also set
conditionally later on.

Fixes: 4a078bd135 ("firmware-utils/ptgen: fix partition guid and name")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: maurerr <mariusd84@gmail.com>
2021-09-01 08:07:48 +00:00

668 lines
17 KiB
C
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/*
* ptgen - partition table generator
* Copyright (C) 2006 by Felix Fietkau <nbd@nbd.name>
*
* uses parts of afdisk
* Copyright (C) 2002 by David Roetzel <david@roetzel.de>
*
* UUID/GUID definition stolen from kernel/include/uapi/linux/uuid.h
* Copyright (C) 2010, Intel Corp. Huang Ying <ying.huang@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <ctype.h>
#include <inttypes.h>
#include <fcntl.h>
#include <stdint.h>
#include "cyg_crc.h"
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_le16(x) bswap_16(x)
#define cpu_to_le32(x) bswap_32(x)
#define cpu_to_le64(x) bswap_64(x)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define cpu_to_le16(x) (x)
#define cpu_to_le32(x) (x)
#define cpu_to_le64(x) (x)
#else
#error unknown endianness!
#endif
#define swap(a, b) \
do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
#define BIT(_x) (1UL << (_x))
typedef struct {
uint8_t b[16];
} guid_t;
#define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
((guid_t) \
{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
(b) & 0xff, ((b) >> 8) & 0xff, \
(c) & 0xff, ((c) >> 8) & 0xff, \
(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
#define GUID_STRING_LENGTH 36
#define GPT_SIGNATURE 0x5452415020494645ULL
#define GPT_REVISION 0x00010000
#define GUID_PARTITION_SYSTEM \
GUID_INIT( 0xC12A7328, 0xF81F, 0x11d2, \
0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
#define GUID_PARTITION_BASIC_DATA \
GUID_INIT( 0xEBD0A0A2, 0xB9E5, 0x4433, \
0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
#define GUID_PARTITION_BIOS_BOOT \
GUID_INIT( 0x21686148, 0x6449, 0x6E6F, \
0x74, 0x4E, 0x65, 0x65, 0x64, 0x45, 0x46, 0x49)
#define GUID_PARTITION_LINUX_FIT_GUID \
GUID_INIT( 0xcae9be83, 0xb15f, 0x49cc, \
0x86, 0x3f, 0x08, 0x1b, 0x74, 0x4a, 0x2d, 0x93)
#define GUID_PARTITION_LINUX_FS_GUID \
GUID_INIT( 0x0fc63daf, 0x8483, 0x4772, \
0x8e, 0x79, 0x3d, 0x69, 0xd8, 0x47, 0x7d, 0xe4)
#define GPT_HEADER_SIZE 92
#define GPT_ENTRY_SIZE 128
#define GPT_ENTRY_MAX 128
#define GPT_ENTRY_NAME_SIZE 72
#define GPT_SIZE GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE
#define GPT_ATTR_PLAT_REQUIRED BIT(0)
#define GPT_ATTR_EFI_IGNORE BIT(1)
#define GPT_ATTR_LEGACY_BOOT BIT(2)
#define GPT_HEADER_SECTOR 1
#define GPT_FIRST_ENTRY_SECTOR 2
#define MBR_ENTRY_MAX 4
#define MBR_DISK_SIGNATURE_OFFSET 440
#define MBR_PARTITION_ENTRY_OFFSET 446
#define MBR_BOOT_SIGNATURE_OFFSET 510
#define DISK_SECTOR_SIZE 512
/* Partition table entry */
struct pte {
uint8_t active;
uint8_t chs_start[3];
uint8_t type;
uint8_t chs_end[3];
uint32_t start;
uint32_t length;
};
struct partinfo {
unsigned long actual_start;
unsigned long start;
unsigned long size;
int type;
int hybrid;
char *name;
short int required;
guid_t guid;
};
/* GPT Partition table header */
struct gpth {
uint64_t signature;
uint32_t revision;
uint32_t size;
uint32_t crc32;
uint32_t reserved;
uint64_t self;
uint64_t alternate;
uint64_t first_usable;
uint64_t last_usable;
guid_t disk_guid;
uint64_t first_entry;
uint32_t entry_num;
uint32_t entry_size;
uint32_t entry_crc32;
} __attribute__((packed));
/* GPT Partition table entry */
struct gpte {
guid_t type;
guid_t guid;
uint64_t start;
uint64_t end;
uint64_t attr;
char name[GPT_ENTRY_NAME_SIZE];
} __attribute__((packed));
int verbose = 0;
int active = 1;
int heads = -1;
int sectors = -1;
int kb_align = 0;
bool ignore_null_sized_partition = false;
bool use_guid_partition_table = false;
struct partinfo parts[GPT_ENTRY_MAX];
char *filename = NULL;
/*
* parse the size argument, which is either
* a simple number (K assumed) or
* K, M or G
*
* returns the size in KByte
*/
static long to_kbytes(const char *string)
{
int exp = 0;
long result;
char *end;
result = strtoul(string, &end, 0);
switch (tolower(*end)) {
case 'k' :
case '\0' : exp = 0; break;
case 'm' : exp = 1; break;
case 'g' : exp = 2; break;
default: return 0;
}
if (*end)
end++;
if (*end) {
fputs("garbage after end of number\n", stderr);
return 0;
}
/* result: number + 1024^(exp) */
if (exp == 0)
return result;
return result * (2 << ((10 * exp) - 1));
}
/* convert the sector number into a CHS value for the partition table */
static void to_chs(long sect, unsigned char chs[3])
{
int c,h,s;
s = (sect % sectors) + 1;
sect = sect / sectors;
h = sect % heads;
sect = sect / heads;
c = sect;
chs[0] = h;
chs[1] = s | ((c >> 2) & 0xC0);
chs[2] = c & 0xFF;
return;
}
/* round the sector number up to the next cylinder */
static inline unsigned long round_to_cyl(long sect)
{
int cyl_size = heads * sectors;
return sect + cyl_size - (sect % cyl_size);
}
/* round the sector number up to the kb_align boundary */
static inline unsigned long round_to_kb(long sect) {
return ((sect - 1) / kb_align + 1) * kb_align;
}
/* Compute a CRC for guid partition table */
static inline unsigned long gpt_crc32(void *buf, unsigned long len)
{
return cyg_crc32_accumulate(~0L, buf, len) ^ ~0L;
}
/* Parse a guid string to guid_t struct */
static inline int guid_parse(char *buf, guid_t *guid)
{
char b[4] = {0};
char *p = buf;
unsigned i = 0;
if (strnlen(buf, GUID_STRING_LENGTH) != GUID_STRING_LENGTH)
return -1;
for (i = 0; i < sizeof(guid_t); i++) {
if (*p == '-')
p++;
if (*p == '\0')
return -1;
memcpy(b, p, 2);
guid->b[i] = strtol(b, 0, 16);
p += 2;
}
swap(guid->b[0], guid->b[3]);
swap(guid->b[1], guid->b[2]);
swap(guid->b[4], guid->b[5]);
swap(guid->b[6], guid->b[7]);
return 0;
}
/* init an utf-16 string from utf-8 string */
static inline void init_utf16(char *str, uint16_t *buf, unsigned bufsize)
{
unsigned i, n = 0;
for (i = 0; i < bufsize; i++) {
if (str[n] == 0x00) {
buf[i] = 0x00;
return ;
} else if ((str[n] & 0x80) == 0x00) {//0xxxxxxx
buf[i] = cpu_to_le16(str[n++]);
} else if ((str[n] & 0xE0) == 0xC0) {//110xxxxx
buf[i] = cpu_to_le16((str[n] & 0x1F) << 6 | (str[n + 1] & 0x3F));
n += 2;
} else if ((str[n] & 0xF0) == 0xE0) {//1110xxxx
buf[i] = cpu_to_le16((str[n] & 0x0F) << 12 | (str[n + 1] & 0x3F) << 6 | (str[n + 2] & 0x3F));
n += 3;
} else {
buf[i] = cpu_to_le16('?');
n++;
}
}
}
/* check the partition sizes and write the partition table */
static int gen_ptable(uint32_t signature, int nr)
{
struct pte pte[MBR_ENTRY_MAX];
unsigned long start, len, sect = 0;
int i, fd, ret = -1;
memset(pte, 0, sizeof(struct pte) * MBR_ENTRY_MAX);
for (i = 0; i < nr; i++) {
if (!parts[i].size) {
if (ignore_null_sized_partition)
continue;
fprintf(stderr, "Invalid size in partition %d!\n", i);
return ret;
}
pte[i].active = ((i + 1) == active) ? 0x80 : 0;
pte[i].type = parts[i].type;
start = sect + sectors;
if (parts[i].start != 0) {
if (parts[i].start * 2 < start) {
fprintf(stderr, "Invalid start %ld for partition %d!\n",
parts[i].start, i);
return ret;
}
start = parts[i].start * 2;
} else if (kb_align != 0) {
start = round_to_kb(start);
}
pte[i].start = cpu_to_le32(start);
sect = start + parts[i].size * 2;
if (kb_align == 0)
sect = round_to_cyl(sect);
pte[i].length = cpu_to_le32(len = sect - start);
to_chs(start, pte[i].chs_start);
to_chs(start + len - 1, pte[i].chs_end);
if (verbose)
fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n",
i,
(long)start * DISK_SECTOR_SIZE,
(long)(start + len) * DISK_SECTOR_SIZE,
(long)len * DISK_SECTOR_SIZE);
printf("%ld\n", (long)start * DISK_SECTOR_SIZE);
printf("%ld\n", (long)len * DISK_SECTOR_SIZE);
}
if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
fprintf(stderr, "Can't open output file '%s'\n",filename);
return ret;
}
lseek(fd, MBR_DISK_SIGNATURE_OFFSET, SEEK_SET);
if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
fputs("write failed.\n", stderr);
goto fail;
}
lseek(fd, MBR_PARTITION_ENTRY_OFFSET, SEEK_SET);
if (write(fd, pte, sizeof(struct pte) * MBR_ENTRY_MAX) != sizeof(struct pte) * MBR_ENTRY_MAX) {
fputs("write failed.\n", stderr);
goto fail;
}
lseek(fd, MBR_BOOT_SIGNATURE_OFFSET, SEEK_SET);
if (write(fd, "\x55\xaa", 2) != 2) {
fputs("write failed.\n", stderr);
goto fail;
}
ret = 0;
fail:
close(fd);
return ret;
}
/* check the partition sizes and write the guid partition table */
static int gen_gptable(uint32_t signature, guid_t guid, unsigned nr)
{
struct pte pte[MBR_ENTRY_MAX];
struct gpth gpth = {
.signature = cpu_to_le64(GPT_SIGNATURE),
.revision = cpu_to_le32(GPT_REVISION),
.size = cpu_to_le32(GPT_HEADER_SIZE),
.self = cpu_to_le64(GPT_HEADER_SECTOR),
.first_usable = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR + GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE),
.first_entry = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR),
.disk_guid = guid,
.entry_num = cpu_to_le32(GPT_ENTRY_MAX),
.entry_size = cpu_to_le32(GPT_ENTRY_SIZE),
};
struct gpte gpte[GPT_ENTRY_MAX];
uint64_t start, end;
uint64_t sect = GPT_SIZE + GPT_FIRST_ENTRY_SECTOR;
int fd, ret = -1;
unsigned i, pmbr = 1;
memset(pte, 0, sizeof(struct pte) * MBR_ENTRY_MAX);
memset(gpte, 0, GPT_ENTRY_SIZE * GPT_ENTRY_MAX);
for (i = 0; i < nr; i++) {
if (!parts[i].size) {
if (ignore_null_sized_partition)
continue;
fprintf(stderr, "Invalid size in partition %d!\n", i);
return ret;
}
start = sect;
if (parts[i].start != 0) {
if (parts[i].start * 2 < start) {
fprintf(stderr, "Invalid start %ld for partition %d!\n",
parts[i].start, i);
return ret;
}
start = parts[i].start * 2;
} else if (kb_align != 0) {
start = round_to_kb(start);
}
parts[i].actual_start = start;
gpte[i].start = cpu_to_le64(start);
sect = start + parts[i].size * 2;
gpte[i].end = cpu_to_le64(sect -1);
gpte[i].guid = guid;
gpte[i].guid.b[sizeof(guid_t) -1] += i + 1;
gpte[i].type = parts[i].guid;
if (parts[i].hybrid && pmbr < MBR_ENTRY_MAX) {
pte[pmbr].active = ((i + 1) == active) ? 0x80 : 0;
pte[pmbr].type = parts[i].type;
pte[pmbr].start = cpu_to_le32(start);
pte[pmbr].length = cpu_to_le32(sect - start);
to_chs(start, pte[1].chs_start);
to_chs(sect - 1, pte[1].chs_end);
pmbr++;
}
if (parts[i].name)
init_utf16(parts[i].name, (uint16_t *)gpte[i].name, GPT_ENTRY_NAME_SIZE / sizeof(uint16_t));
if ((i + 1) == (unsigned)active)
gpte[i].attr |= GPT_ATTR_LEGACY_BOOT;
if (parts[i].required)
gpte[i].attr |= GPT_ATTR_PLAT_REQUIRED;
if (verbose)
fprintf(stderr, "Partition %d: start=%" PRIu64 ", end=%" PRIu64 ", size=%" PRIu64 "\n",
i,
start * DISK_SECTOR_SIZE, sect * DISK_SECTOR_SIZE,
(sect - start) * DISK_SECTOR_SIZE);
printf("%" PRIu64 "\n", start * DISK_SECTOR_SIZE);
printf("%" PRIu64 "\n", (sect - start) * DISK_SECTOR_SIZE);
}
if (parts[0].actual_start > GPT_FIRST_ENTRY_SECTOR + GPT_SIZE) {
gpte[GPT_ENTRY_MAX - 1].start = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR + GPT_SIZE);
gpte[GPT_ENTRY_MAX - 1].end = cpu_to_le64(parts[0].actual_start - 1);
gpte[GPT_ENTRY_MAX - 1].type = GUID_PARTITION_BIOS_BOOT;
gpte[GPT_ENTRY_MAX - 1].guid = guid;
gpte[GPT_ENTRY_MAX - 1].guid.b[sizeof(guid_t) -1] += GPT_ENTRY_MAX;
}
end = sect + GPT_SIZE;
pte[0].type = 0xEE;
pte[0].start = cpu_to_le32(GPT_HEADER_SECTOR);
pte[0].length = cpu_to_le32(end - GPT_HEADER_SECTOR);
to_chs(GPT_HEADER_SECTOR, pte[0].chs_start);
to_chs(end, pte[0].chs_end);
gpth.last_usable = cpu_to_le64(end - GPT_SIZE - 1);
gpth.alternate = cpu_to_le64(end);
gpth.entry_crc32 = cpu_to_le32(gpt_crc32(gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX));
gpth.crc32 = cpu_to_le32(gpt_crc32((char *)&gpth, GPT_HEADER_SIZE));
if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
fprintf(stderr, "Can't open output file '%s'\n",filename);
return ret;
}
lseek(fd, MBR_DISK_SIGNATURE_OFFSET, SEEK_SET);
if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
fputs("write failed.\n", stderr);
goto fail;
}
lseek(fd, MBR_PARTITION_ENTRY_OFFSET, SEEK_SET);
if (write(fd, pte, sizeof(struct pte) * MBR_ENTRY_MAX) != sizeof(struct pte) * MBR_ENTRY_MAX) {
fputs("write failed.\n", stderr);
goto fail;
}
lseek(fd, MBR_BOOT_SIGNATURE_OFFSET, SEEK_SET);
if (write(fd, "\x55\xaa", 2) != 2) {
fputs("write failed.\n", stderr);
goto fail;
}
if (write(fd, &gpth, GPT_HEADER_SIZE) != GPT_HEADER_SIZE) {
fputs("write failed.\n", stderr);
goto fail;
}
lseek(fd, GPT_FIRST_ENTRY_SECTOR * DISK_SECTOR_SIZE, SEEK_SET);
if (write(fd, &gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX) != GPT_ENTRY_SIZE * GPT_ENTRY_MAX) {
fputs("write failed.\n", stderr);
goto fail;
}
#ifdef WANT_ALTERNATE_PTABLE
/* The alternate partition table (We omit it by default) */
swap(gpth.self, gpth.alternate);
gpth.first_entry = cpu_to_le64(end - GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE),
gpth.crc32 = 0;
gpth.crc32 = cpu_to_le32(gpt_crc32(&gpth, GPT_HEADER_SIZE));
lseek(fd, end * DISK_SECTOR_SIZE - GPT_ENTRY_SIZE * GPT_ENTRY_MAX, SEEK_SET);
if (write(fd, &gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX) != GPT_ENTRY_SIZE * GPT_ENTRY_MAX) {
fputs("write failed.\n", stderr);
goto fail;
}
lseek(fd, end * DISK_SECTOR_SIZE, SEEK_SET);
if (write(fd, &gpth, GPT_HEADER_SIZE) != GPT_HEADER_SIZE) {
fputs("write failed.\n", stderr);
goto fail;
}
lseek(fd, (end + 1) * DISK_SECTOR_SIZE -1, SEEK_SET);
if (write(fd, "\x00", 1) != 1) {
fputs("write failed.\n", stderr);
goto fail;
}
#endif
ret = 0;
fail:
close(fd);
return ret;
}
static void usage(char *prog)
{
fprintf(stderr, "Usage: %s [-v] [-n] [-g] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [-G <guid>] [[-t <type>] [-r] [-N <name>] -p <size>[@<start>]...] \n", prog);
exit(EXIT_FAILURE);
}
static guid_t type_to_guid_and_name(unsigned char type, char **name)
{
guid_t guid = GUID_PARTITION_BASIC_DATA;
switch (type) {
case 0xef:
if(*name == NULL)
*name = "EFI System Partition";
guid = GUID_PARTITION_SYSTEM;
break;
case 0x83:
guid = GUID_PARTITION_LINUX_FS_GUID;
break;
case 0x2e:
guid = GUID_PARTITION_LINUX_FIT_GUID;
break;
}
return guid;
}
int main (int argc, char **argv)
{
unsigned char type = 0x83;
char *p;
int ch;
int part = 0;
char *name = NULL;
unsigned short int hybrid = 0, required = 0;
uint32_t signature = 0x5452574F; /* 'OWRT' */
guid_t guid = GUID_INIT( signature, 0x2211, 0x4433, \
0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0x00);
guid_t part_guid = GUID_PARTITION_BASIC_DATA;
while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vnHN:gl:rS:G:")) != -1) {
switch (ch) {
case 'o':
filename = optarg;
break;
case 'v':
verbose++;
break;
case 'n':
ignore_null_sized_partition = true;
break;
case 'g':
use_guid_partition_table = 1;
break;
case 'H':
hybrid = 1;
break;
case 'h':
heads = (int)strtoul(optarg, NULL, 0);
break;
case 's':
sectors = (int)strtoul(optarg, NULL, 0);
break;
case 'p':
if (part > GPT_ENTRY_MAX - 1 || (!use_guid_partition_table && part > 3)) {
fputs("Too many partitions\n", stderr);
exit(EXIT_FAILURE);
}
p = strchr(optarg, '@');
if (p) {
*(p++) = 0;
parts[part].start = to_kbytes(p);
}
part_guid = type_to_guid_and_name(type, &name);
parts[part].size = to_kbytes(optarg);
parts[part].required = required;
parts[part].name = name;
parts[part].hybrid = hybrid;
parts[part].guid = part_guid;
fprintf(stderr, "part %ld %ld\n", parts[part].start, parts[part].size);
parts[part++].type = type;
/*
* reset 'name','required' and 'hybrid'
* 'type' is deliberately inherited from the previous delcaration
*/
name = NULL;
required = 0;
hybrid = 0;
break;
case 'N':
name = optarg;
break;
case 'r':
required = 1;
break;
case 't':
type = (char)strtoul(optarg, NULL, 16);
break;
case 'a':
active = (int)strtoul(optarg, NULL, 0);
if ((active < 0) || (active > 4))
active = 0;
break;
case 'l':
kb_align = (int)strtoul(optarg, NULL, 0) * 2;
break;
case 'S':
signature = strtoul(optarg, NULL, 0);
break;
case 'G':
if (guid_parse(optarg, &guid)) {
fputs("Invalid guid string\n", stderr);
exit(EXIT_FAILURE);
}
break;
case '?':
default:
usage(argv[0]);
}
}
argc -= optind;
if (argc || (!use_guid_partition_table && ((heads <= 0) || (sectors <= 0))) || !filename)
usage(argv[0]);
if (use_guid_partition_table) {
heads = 254;
sectors = 63;
return gen_gptable(signature, guid, part) ? EXIT_FAILURE : EXIT_SUCCESS;
}
return gen_ptable(signature, part) ? EXIT_FAILURE : EXIT_SUCCESS;
}
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