VtoyTool/vtoydump.c

   1 /******************************************************************************
   2  * vtoydump.c  ---- Dump ventoy os parameters
   3  *
   4  * Copyright (c) 2020, longpanda <admin@ventoy.net>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 3 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <sys/types.h>
  28 #include <sys/mman.h>
  29 #include <sys/ioctl.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32 #include <linux/fs.h>
  33 #include <dirent.h>
  34
  35 #define IS_DIGIT(x) ((x) >= '0' && (x) <= '9')
  36
  37 #ifndef USE_DIET_C
  38 typedef unsigned long long uint64_t;
  39 typedef unsigned int    uint32_t;
  40 typedef unsigned short  uint16_t;
  41 typedef unsigned char   uint8_t;
  42 #endif
  43
  44 #define VENTOY_GUID { 0x77772020, 0x2e77, 0x6576, { 0x6e, 0x74, 0x6f, 0x79, 0x2e, 0x6e, 0x65, 0x74 }}
  45
  46 #pragma pack(1)
  47
  48 typedef struct ventoy_guid
  49 {
  50     uint32_t   data1;
  51     uint16_t   data2;
  52     uint16_t   data3;
  53     uint8_t    data4[8];
  54 }ventoy_guid;
  55
  56
  57 typedef struct ventoy_image_disk_region
  58 {
  59     uint32_t   image_sector_count; /* image sectors contained in this region */
  60     uint32_t   image_start_sector; /* image sector start */
  61     uint64_t   disk_start_sector;  /* disk sector start */
  62 }ventoy_image_disk_region;
  63
  64 typedef struct ventoy_image_location
  65 {
  66     ventoy_guid  guid;
  67
  68     /* image sector size, currently this value is always 2048 */
  69     uint32_t   image_sector_size;
  70
  71     /* disk sector size, normally the value is 512 */
  72     uint32_t   disk_sector_size;
  73
  74     uint32_t   region_count;
  75
  76     /*
  77      * disk region data
  78      * If the image file has more than one fragments in disk,
  79      * there will be more than one region data here.
  80      * You can calculate the region count by
  81      */
  82     ventoy_image_disk_region regions[1];
  83
  84     /* ventoy_image_disk_region regions[2~region_count-1] */
  85 }ventoy_image_location;
  86
  87 typedef struct ventoy_os_param
  88 {
  89     ventoy_guid    guid;             // VENTOY_GUID
  90     uint8_t        chksum;           // checksum
  91
  92     uint8_t   vtoy_disk_guid[16];
  93     uint64_t  vtoy_disk_size;       // disk size in bytes
  94     uint16_t  vtoy_disk_part_id;    // begin with 1
  95     uint16_t  vtoy_disk_part_type;  // 0:exfat   1:ntfs  other: reserved
  96     char      vtoy_img_path[384];   // It seems to be enough, utf-8 format
  97     uint64_t  vtoy_img_size;        // image file size in bytes
  98
  99     /*
 100      * Ventoy will write a copy of ventoy_image_location data into runtime memory
 101      * this is the physically address and length of that memory.
 102      * Address 0 means no such data exist.
 103      * Address will be aligned by 4KB.
 104      *
 105      */
 106     uint64_t  vtoy_img_location_addr;
 107     uint32_t  vtoy_img_location_len;
 108
 109     uint64_t  vtoy_reserved[4];     // Internal use by ventoy
 110
 111     uint8_t   reserved[31];
 112 }ventoy_os_param;
 113
 114 #pragma pack()
 115
 116 #ifndef O_BINARY
 117 #define O_BINARY 0
 118 #endif
 119 #if defined(_dragon_fly) || defined(_free_BSD) || defined(_QNX)
 120 #define MMAP_FLAGS          MAP_SHARED
 121 #else
 122 #define MMAP_FLAGS          MAP_PRIVATE
 123 #endif
 124
 125 #define SEARCH_MEM_START 0x80000
 126 #define SEARCH_MEM_LEN   0x1c000
 127
 128 static int verbose = 0;
 129 #define debug(fmt, ...) if(verbose) printf(fmt, ##__VA_ARGS__)
 130
 131 static ventoy_guid vtoy_guid = VENTOY_GUID;
 132
 133 static int vtoy_check_os_param(ventoy_os_param *param)
 134 {
 135     uint32_t i;
 136     uint8_t  chksum = 0;
 137     uint8_t *buf = (uint8_t *)param;
 138
 139     if (memcmp(&param->guid, &vtoy_guid, sizeof(ventoy_guid)))
 140     {
 141         return 1;
 142     }
 143
 144     for (i = 0; i < sizeof(ventoy_os_param); i++)
 145     {
 146         chksum += buf[i];
 147     }
 148
 149     if (chksum)
 150     {
 151         debug("Invalid checksum 0x%02x\n", chksum);
 152         return 1;
 153     }
 154
 155     return 0;
 156 }
 157
 158 static int vtoy_os_param_from_file(const char *filename, ventoy_os_param *param)
 159 {
 160     int fd = 0;
 161     int rc = 0;
 162
 163     fd = open(filename, O_RDONLY | O_BINARY);
 164     if (fd < 0)
 165     {
 166         fprintf(stderr, "Failed to open file %s error %d\n", filename, errno);
 167         return errno;
 168     }
 169
 170     read(fd, param, sizeof(ventoy_os_param));
 171
 172     if (vtoy_check_os_param(param) == 0)
 173     {
 174         debug("find ventoy os param in file %s\n", filename);
 175     }
 176     else
 177     {
 178         debug("ventoy os pararm NOT found in file %s\n", filename);
 179         rc = 1;
 180     }
 181
 182     close(fd);
 183     return rc;
 184 }
 185
 186 static void vtoy_dump_os_param(ventoy_os_param *param)
 187 {
 188     printf("################# dump os param ################\n");
 189
 190     printf("param->chksum = 0x%x\n", param->chksum);
 191     printf("param->vtoy_disk_guid = %02x %02x %02x %02x\n",
 192         param->vtoy_disk_guid[0], param->vtoy_disk_guid[1],
 193         param->vtoy_disk_guid[2], param->vtoy_disk_guid[3]);
 194     printf("param->vtoy_disk_size = %llu\n", (unsigned long long)param->vtoy_disk_size);
 195     printf("param->vtoy_disk_part_id = %u\n", param->vtoy_disk_part_id);
 196     printf("param->vtoy_disk_part_type = %u\n", param->vtoy_disk_part_type);
 197     printf("param->vtoy_img_path = <%s>\n", param->vtoy_img_path);
 198     printf("param->vtoy_img_size = <%llu>\n", (unsigned long long)param->vtoy_img_size);
 199     printf("param->vtoy_img_location_addr = <0x%llx>\n", (unsigned long long)param->vtoy_img_location_addr);
 200     printf("param->vtoy_img_location_len = <%u>\n", param->vtoy_img_location_len);
 201     printf("param->vtoy_reserved[0] = 0x%llx\n", (unsigned long long)param->vtoy_reserved[0]);
 202     printf("param->vtoy_reserved[1] = 0x%llx\n", (unsigned long long)param->vtoy_reserved[1]);
 203
 204     printf("\n");
 205 }
 206
 207 static int vtoy_get_disk_guid(const char *diskname, uint8_t *vtguid)
 208 {
 209     int i = 0;
 210     int fd = 0;
 211     char devdisk[128] = {0};
 212
 213     snprintf(devdisk, sizeof(devdisk) - 1, "/dev/%s", diskname);
 214
 215     fd = open(devdisk, O_RDONLY | O_BINARY);
 216     if (fd >= 0)
 217     {
 218         lseek(fd, 0x180, SEEK_SET);
 219         read(fd, vtguid, 16);
 220         close(fd);
 221
 222         debug("GUID for %s: <", devdisk);
 223         for (i = 0; i < 16; i++)
 224         {
 225             debug("%02x", vtguid[i]);
 226         }
 227         debug(">\n");
 228
 229         return 0;
 230     }
 231     else
 232     {
 233         debug("failed to open %s %d\n", devdisk, errno);
 234         return errno;
 235     }
 236 }
 237
 238 static unsigned long long vtoy_get_disk_size_in_byte(const char *disk)
 239 {
 240     int fd;
 241     int rc;
 242     unsigned long long size = 0;
 243     char diskpath[256] = {0};
 244     char sizebuf[64] = {0};
 245
 246     // Try 1: get size from sysfs
 247     snprintf(diskpath, sizeof(diskpath) - 1, "/sys/block/%s/size", disk);
 248     if (access(diskpath, F_OK) >= 0)
 249     {
 250         debug("get disk size from sysfs for %s\n", disk);
 251
 252         fd = open(diskpath, O_RDONLY | O_BINARY);
 253         if (fd >= 0)
 254         {
 255             read(fd, sizebuf, sizeof(sizebuf));
 256             size = strtoull(sizebuf, NULL, 10);
 257             close(fd);
 258             return (size * 512);
 259         }
 260     }
 261     else
 262     {
 263         debug("%s not exist \n", diskpath);
 264     }
 265
 266     // Try 2: get size from ioctl
 267     snprintf(diskpath, sizeof(diskpath) - 1, "/dev/%s", disk);
 268     fd = open(diskpath, O_RDONLY);
 269     if (fd >= 0)
 270     {
 271         debug("get disk size from ioctl for %s\n", disk);
 272         rc = ioctl(fd, BLKGETSIZE64, &size);
 273         if (rc == -1)
 274         {
 275             size = 0;
 276             debug("failed to ioctl %d\n", rc);
 277         }
 278         close(fd);
 279     }
 280     else
 281     {
 282         debug("failed to open %s %d\n", diskpath, errno);
 283     }
 284
 285     debug("disk %s size %llu bytes\n", disk, (unsigned long long)size);
 286     return size;
 287 }
 288
 289 static int vtoy_is_possible_blkdev(const char *name)
 290 {
 291     if (name[0] == '.')
 292     {
 293         return 0;
 294     }
 295
 296     /* /dev/ramX */
 297     if (name[0] == 'r' && name[1] == 'a' && name[2] == 'm')
 298     {
 299         return 0;
 300     }
 301
 302     /* /dev/loopX */
 303     if (name[0] == 'l' && name[1] == 'o' && name[2] == 'o' && name[3] == 'p')
 304     {
 305         return 0;
 306     }
 307
 308     /* /dev/dm-X */
 309     if (name[0] == 'd' && name[1] == 'm' && name[2] == '-' && IS_DIGIT(name[3]))
 310     {
 311         return 0;
 312     }
 313
 314     /* /dev/srX */
 315     if (name[0] == 's' && name[1] == 'r' && IS_DIGIT(name[2]))
 316     {
 317         return 0;
 318     }
 319
 320     return 1;
 321 }
 322
 323 static int vtoy_find_disk_by_size(unsigned long long size, char *diskname)
 324 {
 325     unsigned long long cursize = 0;
 326     DIR* dir = NULL;
 327     struct dirent* p = NULL;
 328     int rc = 0;
 329
 330     dir = opendir("/sys/block");
 331     while ((p = readdir(dir)) != NULL)
 332     {
 333         if (!vtoy_is_possible_blkdev(p->d_name))
 334         {
 335             debug("disk %s is filted by name\n", p->d_name);
 336             continue;
 337         }
 338
 339         cursize = vtoy_get_disk_size_in_byte(p->d_name);
 340         debug("disk %s size %llu\n", p->d_name, (unsigned long long)cursize);
 341         if (cursize == size)
 342         {
 343             sprintf(diskname, "%s", p->d_name);
 344             rc++;
 345         }
 346     }
 347     closedir(dir);
 348     return rc;
 349 }
 350
 351 static int vtoy_find_disk_by_guid(uint8_t *guid, char *diskname)
 352 {
 353     int rc = 0;
 354     int count = 0;
 355     DIR* dir = NULL;
 356     struct dirent* p = NULL;
 357     uint8_t vtguid[16];
 358
 359     dir = opendir("/sys/block");
 360     while ((p = readdir(dir)) != NULL)
 361     {
 362         if (!vtoy_is_possible_blkdev(p->d_name))
 363         {
 364             debug("disk %s is filted by name\n", p->d_name);
 365             continue;
 366         }
 367
 368         memset(vtguid, 0, sizeof(vtguid));
 369         rc = vtoy_get_disk_guid(p->d_name, vtguid);
 370         if (rc == 0 && memcmp(vtguid, guid, 16) == 0)
 371         {
 372             sprintf(diskname, "%s", p->d_name);
 373             count++;
 374         }
 375     }
 376     closedir(dir);
 377
 378     return count;
 379 }
 380
 381 static int vtoy_print_os_param(ventoy_os_param *param, char *diskname)
 382 {
 383     int   cnt = 0;
 384     char *path = param->vtoy_img_path;
 385     const char *fs;
 386
 387     cnt = vtoy_find_disk_by_size(param->vtoy_disk_size, diskname);
 388     if (cnt > 1)
 389     {
 390         cnt = vtoy_find_disk_by_guid(param->vtoy_disk_guid, diskname);
 391     }
 392     else if (cnt == 0)
 393     {
 394         cnt = vtoy_find_disk_by_guid(param->vtoy_disk_guid, diskname);
 395         debug("find 0 disk by size, try with guid cnt=%d...\n", cnt);
 396     }
 397
 398     if (param->vtoy_disk_part_type == 0)
 399     {
 400         fs = "exfat";
 401     }
 402     else if (param->vtoy_disk_part_type == 0)
 403     {
 404         fs = "ntfs";
 405     }
 406     else
 407     {
 408         fs = "unknown";
 409     }
 410
 411     if (1 == cnt)
 412     {
 413         printf("/dev/%s#%s#%s\n", diskname, fs, path);
 414         return 0;
 415     }
 416     else
 417     {
 418         return 1;
 419     }
 420 }
 421
 422 static int vtoy_check_device(ventoy_os_param *param, const char *device)
 423 {
 424     unsigned long long size;
 425     uint8_t vtguid[16] = {0};
 426
 427     debug("vtoy_check_device for <%s>\n", device);
 428
 429     size = vtoy_get_disk_size_in_byte(device);
 430     vtoy_get_disk_guid(device, vtguid);
 431
 432     debug("param->vtoy_disk_size=%llu size=%llu\n",
 433         (unsigned long long)param->vtoy_disk_size, (unsigned long long)size);
 434
 435     if (param->vtoy_disk_size == size &&
 436         memcmp(vtguid, param->vtoy_disk_guid, 16) == 0)
 437     {
 438         debug("<%s> is right ventoy disk\n", device);
 439         return 0;
 440     }
 441     else
 442     {
 443         debug("<%s> is NOT right ventoy disk\n", device);
 444         return 1;
 445     }
 446 }
 447
 448 /*
 449  *  Find disk and image path from ventoy runtime data.
 450  *  By default data is read from phymem(legacy bios) or efivar(UEFI), if -f is input, data is read from file.
 451  *
 452  *  -f datafile     os param data file.
 453  *  -c /dev/xxx     check ventoy disk
 454  *  -v              be verbose
 455  *  -l              also print image disk location
 456  */
 457 int vtoydump_main(int argc, char **argv)
 458 {
 459     int rc;
 460     int ch;
 461     char filename[256] = {0};
 462     char diskname[256] = {0};
 463     char device[64] = {0};
 464     ventoy_os_param *param = NULL;
 465
 466     while ((ch = getopt(argc, argv, "c:f:v::")) != -1)
 467     {
 468         if (ch == 'f')
 469         {
 470             strncpy(filename, optarg, sizeof(filename) - 1);
 471         }
 472         else if (ch == 'v')
 473         {
 474             verbose = 1;
 475         }
 476         else if (ch == 'c')
 477         {
 478             strncpy(device, optarg, sizeof(device) - 1);
 479         }
 480         else
 481         {
 482             fprintf(stderr, "Usage: %s -f datafile [ -v ] \n", argv[0]);
 483             return 1;
 484         }
 485     }
 486
 487     if (filename[0] == 0)
 488     {
 489         fprintf(stderr, "Usage: %s -f datafile [ -v ] \n", argv[0]);
 490         return 1;
 491     }
 492
 493     param = malloc(sizeof(ventoy_os_param));
 494     if (NULL == param)
 495     {
 496         fprintf(stderr, "failed to alloc memory with size %d error %d\n",
 497                 (int)sizeof(ventoy_os_param), errno);
 498         return 1;
 499     }
 500
 501     memset(param, 0, sizeof(ventoy_os_param));
 502
 503     debug("get os pararm from file %s\n", filename);
 504     rc = vtoy_os_param_from_file(filename, param);
 505     if (rc)
 506     {
 507         debug("ventoy os param not found %d\n", rc);
 508         goto end;
 509     }
 510
 511     if (verbose)
 512     {
 513         vtoy_dump_os_param(param);
 514     }
 515
 516     if (device[0])
 517     {
 518         rc = vtoy_check_device(param, device);
 519     }
 520     else
 521     {
 522         // print os param, you can change the output format in the function
 523         rc = vtoy_print_os_param(param, diskname);
 524     }
 525
 526 end:
 527     if (param)
 528     {
 529         free(param);
 530     }
 531     return rc;
 532 }
 533
 534 // wrapper main
 535 #ifndef BUILD_VTOY_TOOL
 536 int main(int argc, char **argv)
 537 {
 538     return vtoydump_main(argc, argv);
 539 }
 540 #endif
 541