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Ventoy/VtoyTool/vtoydump.c

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/******************************************************************************
* vtoydump.c ---- Dump ventoy os parameters
*
* Copyright (c) 2020, longpanda <admin@ventoy.net>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <linux/fs.h>
#include <dirent.h>
#define IS_DIGIT(x) ((x) >= '0' && (x) <= '9')
#ifndef USE_DIET_C
typedef unsigned long long uint64_t;
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned char uint8_t;
#endif
#define VENTOY_GUID { 0x77772020, 0x2e77, 0x6576, { 0x6e, 0x74, 0x6f, 0x79, 0x2e, 0x6e, 0x65, 0x74 }}
typedef enum ventoy_fs_type
{
ventoy_fs_exfat = 0, /* 0: exfat */
ventoy_fs_ntfs, /* 1: NTFS */
ventoy_fs_ext, /* 2: ext2/ext3/ext4 */
ventoy_fs_xfs, /* 3: XFS */
ventoy_fs_udf, /* 4: UDF */
ventoy_fs_fat, /* 5: FAT */
ventoy_fs_max
}ventoy_fs_type;
#pragma pack(1)
typedef struct ventoy_guid
{
uint32_t data1;
uint16_t data2;
uint16_t data3;
uint8_t data4[8];
}ventoy_guid;
typedef struct ventoy_image_disk_region
{
uint32_t image_sector_count; /* image sectors contained in this region */
uint32_t image_start_sector; /* image sector start */
uint64_t disk_start_sector; /* disk sector start */
}ventoy_image_disk_region;
typedef struct ventoy_image_location
{
ventoy_guid guid;
/* image sector size, currently this value is always 2048 */
uint32_t image_sector_size;
/* disk sector size, normally the value is 512 */
uint32_t disk_sector_size;
uint32_t region_count;
/*
* disk region data
* If the image file has more than one fragments in disk,
* there will be more than one region data here.
* You can calculate the region count by
*/
ventoy_image_disk_region regions[1];
/* ventoy_image_disk_region regions[2~region_count-1] */
}ventoy_image_location;
typedef struct ventoy_os_param
{
ventoy_guid guid; // VENTOY_GUID
uint8_t chksum; // checksum
uint8_t vtoy_disk_guid[16];
uint64_t vtoy_disk_size; // disk size in bytes
uint16_t vtoy_disk_part_id; // begin with 1
uint16_t vtoy_disk_part_type; // 0:exfat 1:ntfs other: reserved
char vtoy_img_path[384]; // It seems to be enough, utf-8 format
uint64_t vtoy_img_size; // image file size in bytes
/*
* Ventoy will write a copy of ventoy_image_location data into runtime memory
* this is the physically address and length of that memory.
* Address 0 means no such data exist.
* Address will be aligned by 4KB.
*
*/
uint64_t vtoy_img_location_addr;
uint32_t vtoy_img_location_len;
uint64_t vtoy_reserved[4]; // Internal use by ventoy
uint8_t vtoy_disk_signature[4];
uint8_t reserved[27];
}ventoy_os_param;
#pragma pack()
#ifndef O_BINARY
#define O_BINARY 0
#endif
#if defined(_dragon_fly) || defined(_free_BSD) || defined(_QNX)
#define MMAP_FLAGS MAP_SHARED
#else
#define MMAP_FLAGS MAP_PRIVATE
#endif
#define SEARCH_MEM_START 0x80000
#define SEARCH_MEM_LEN 0x1c000
static int verbose = 0;
#define debug(fmt, ...) if(verbose) printf(fmt, ##__VA_ARGS__)
static ventoy_guid vtoy_guid = VENTOY_GUID;
static const char *g_ventoy_fs[ventoy_fs_max] =
{
"exfat", "ntfs", "ext*", "xfs", "udf", "fat"
};
static int vtoy_check_os_param(ventoy_os_param *param)
{
uint32_t i;
uint8_t chksum = 0;
uint8_t *buf = (uint8_t *)param;
if (memcmp(&param->guid, &vtoy_guid, sizeof(ventoy_guid)))
{
uint8_t *data1 = (uint8_t *)(&param->guid);
uint8_t *data2 = (uint8_t *)(&vtoy_guid);
for (i = 0; i < 16; i++)
{
if (data1[i] != data2[i])
{
debug("guid not equal i = %u, 0x%02x, 0x%02x\n", i, data1[i], data2[i]);
}
}
return 1;
}
for (i = 0; i < sizeof(ventoy_os_param); i++)
{
chksum += buf[i];
}
if (chksum)
{
debug("Invalid checksum 0x%02x\n", chksum);
return 1;
}
return 0;
}
static int vtoy_os_param_from_file(const char *filename, ventoy_os_param *param)
{
int fd = 0;
int rc = 0;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
{
fprintf(stderr, "Failed to open file %s error %d\n", filename, errno);
return errno;
}
read(fd, param, sizeof(ventoy_os_param));
if (vtoy_check_os_param(param) == 0)
{
debug("find ventoy os param in file %s\n", filename);
}
else
{
debug("ventoy os pararm NOT found in file %s\n", filename);
rc = 1;
}
close(fd);
return rc;
}
static void vtoy_dump_os_param(ventoy_os_param *param)
{
printf("################# dump os param ################\n");
printf("param->chksum = 0x%x\n", param->chksum);
printf("param->vtoy_disk_guid = %02x %02x %02x %02x\n",
param->vtoy_disk_guid[0], param->vtoy_disk_guid[1],
param->vtoy_disk_guid[2], param->vtoy_disk_guid[3]);
printf("param->vtoy_disk_signature = %02x %02x %02x %02x\n",
param->vtoy_disk_signature[0], param->vtoy_disk_signature[1],
param->vtoy_disk_signature[2], param->vtoy_disk_signature[3]);
printf("param->vtoy_disk_size = %llu\n", (unsigned long long)param->vtoy_disk_size);
printf("param->vtoy_disk_part_id = %u\n", param->vtoy_disk_part_id);
printf("param->vtoy_disk_part_type = %u\n", param->vtoy_disk_part_type);
printf("param->vtoy_img_path = <%s>\n", param->vtoy_img_path);
printf("param->vtoy_img_size = <%llu>\n", (unsigned long long)param->vtoy_img_size);
printf("param->vtoy_img_location_addr = <0x%llx>\n", (unsigned long long)param->vtoy_img_location_addr);
printf("param->vtoy_img_location_len = <%u>\n", param->vtoy_img_location_len);
printf("param->vtoy_reserved[0] = 0x%llx\n", (unsigned long long)param->vtoy_reserved[0]);
printf("param->vtoy_reserved[1] = 0x%llx\n", (unsigned long long)param->vtoy_reserved[1]);
printf("\n");
}
static int vtoy_get_disk_guid(const char *diskname, uint8_t *vtguid, uint8_t *vtsig)
{
int i = 0;
int fd = 0;
char devdisk[128] = {0};
snprintf(devdisk, sizeof(devdisk) - 1, "/dev/%s", diskname);
fd = open(devdisk, O_RDONLY | O_BINARY);
if (fd >= 0)
{
lseek(fd, 0x180, SEEK_SET);
read(fd, vtguid, 16);
lseek(fd, 0x1b8, SEEK_SET);
read(fd, vtsig, 4);
close(fd);
debug("GUID for %s: <", devdisk);
for (i = 0; i < 16; i++)
{
debug("%02x", vtguid[i]);
}
debug(">\n");
return 0;
}
else
{
debug("failed to open %s %d\n", devdisk, errno);
return errno;
}
}
static unsigned long long vtoy_get_disk_size_in_byte(const char *disk)
{
int fd;
int rc;
unsigned long long size = 0;
char diskpath[256] = {0};
char sizebuf[64] = {0};
// Try 1: get size from sysfs
snprintf(diskpath, sizeof(diskpath) - 1, "/sys/block/%s/size", disk);
if (access(diskpath, F_OK) >= 0)
{
debug("get disk size from sysfs for %s\n", disk);
fd = open(diskpath, O_RDONLY | O_BINARY);
if (fd >= 0)
{
read(fd, sizebuf, sizeof(sizebuf));
size = strtoull(sizebuf, NULL, 10);
close(fd);
return (size * 512);
}
}
else
{
debug("%s not exist \n", diskpath);
}
// Try 2: get size from ioctl
snprintf(diskpath, sizeof(diskpath) - 1, "/dev/%s", disk);
fd = open(diskpath, O_RDONLY);
if (fd >= 0)
{
debug("get disk size from ioctl for %s\n", disk);
rc = ioctl(fd, BLKGETSIZE64, &size);
if (rc == -1)
{
size = 0;
debug("failed to ioctl %d\n", rc);
}
close(fd);
}
else
{
debug("failed to open %s %d\n", diskpath, errno);
}
debug("disk %s size %llu bytes\n", disk, (unsigned long long)size);
return size;
}
static int vtoy_is_possible_blkdev(const char *name)
{
if (name[0] == '.')
{
return 0;
}
/* /dev/ramX */
if (name[0] == 'r' && name[1] == 'a' && name[2] == 'm')
{
return 0;
}
/* /dev/loopX */
if (name[0] == 'l' && name[1] == 'o' && name[2] == 'o' && name[3] == 'p')
{
return 0;
}
/* /dev/dm-X */
if (name[0] == 'd' && name[1] == 'm' && name[2] == '-' && IS_DIGIT(name[3]))
{
return 0;
}
/* /dev/srX */
if (name[0] == 's' && name[1] == 'r' && IS_DIGIT(name[2]))
{
return 0;
}
return 1;
}
static int vtoy_find_disk_by_size(unsigned long long size, char *diskname)
{
unsigned long long cursize = 0;
DIR* dir = NULL;
struct dirent* p = NULL;
int rc = 0;
dir = opendir("/sys/block");
if (!dir)
{
return 0;
}
while ((p = readdir(dir)) != NULL)
{
if (!vtoy_is_possible_blkdev(p->d_name))
{
debug("disk %s is filted by name\n", p->d_name);
continue;
}
cursize = vtoy_get_disk_size_in_byte(p->d_name);
debug("disk %s size %llu\n", p->d_name, (unsigned long long)cursize);
if (cursize == size)
{
sprintf(diskname, "%s", p->d_name);
rc++;
}
}
closedir(dir);
return rc;
}
static int vtoy_find_disk_by_guid(ventoy_os_param *param, char *diskname)
{
int rc = 0;
int count = 0;
DIR* dir = NULL;
struct dirent* p = NULL;
uint8_t vtguid[16];
uint8_t vtsig[16];
dir = opendir("/sys/block");
if (!dir)
{
return 0;
}
while ((p = readdir(dir)) != NULL)
{
if (!vtoy_is_possible_blkdev(p->d_name))
{
debug("disk %s is filted by name\n", p->d_name);
continue;
}
memset(vtguid, 0, sizeof(vtguid));
rc = vtoy_get_disk_guid(p->d_name, vtguid, vtsig);
if (rc == 0 && memcmp(vtguid, param->vtoy_disk_guid, 16) == 0 &&
memcmp(vtsig, param->vtoy_disk_signature, 4) == 0)
{
sprintf(diskname, "%s", p->d_name);
count++;
}
}
closedir(dir);
return count;
}
static int vtoy_printf_iso_path(ventoy_os_param *param)
{
printf("%s\n", param->vtoy_img_path);
return 0;
}
static int vtoy_print_os_param(ventoy_os_param *param, char *diskname)
{
int cnt = 0;
char *path = param->vtoy_img_path;
const char *fs;
cnt = vtoy_find_disk_by_size(param->vtoy_disk_size, diskname);
if (cnt > 1)
{
cnt = vtoy_find_disk_by_guid(param, diskname);
}
else if (cnt == 0)
{
cnt = vtoy_find_disk_by_guid(param, diskname);
debug("find 0 disk by size, try with guid cnt=%d...\n", cnt);
}
if (param->vtoy_disk_part_type < ventoy_fs_max)
{
fs = g_ventoy_fs[param->vtoy_disk_part_type];
}
else
{
fs = "unknown";
}
if (1 == cnt)
{
printf("/dev/%s#%s#%s\n", diskname, fs, path);
return 0;
}
else
{
return 1;
}
}
static int vtoy_check_device(ventoy_os_param *param, const char *device)
{
unsigned long long size;
uint8_t vtguid[16] = {0};
uint8_t vtsig[4] = {0};
debug("vtoy_check_device for <%s>\n", device);
size = vtoy_get_disk_size_in_byte(device);
vtoy_get_disk_guid(device, vtguid, vtsig);
debug("param->vtoy_disk_size=%llu size=%llu\n",
(unsigned long long)param->vtoy_disk_size, (unsigned long long)size);
if ((param->vtoy_disk_size == size || param->vtoy_disk_size == size + 512) &&
memcmp(vtguid, param->vtoy_disk_guid, 16) == 0 &&
memcmp(vtsig, param->vtoy_disk_signature, 4) == 0)
{
debug("<%s> is right ventoy disk\n", device);
return 0;
}
else
{
debug("<%s> is NOT right ventoy disk\n", device);
return 1;
}
}
/*
* Find disk and image path from ventoy runtime data.
* By default data is read from phymem(legacy bios) or efivar(UEFI), if -f is input, data is read from file.
*
* -f datafile os param data file.
* -c /dev/xxx check ventoy disk
* -v be verbose
* -l also print image disk location
*/
int vtoydump_main(int argc, char **argv)
{
int rc;
int ch;
int print_path = 0;
char filename[256] = {0};
char diskname[256] = {0};
char device[64] = {0};
ventoy_os_param *param = NULL;
while ((ch = getopt(argc, argv, "c:f:p:v::")) != -1)
{
if (ch == 'f')
{
strncpy(filename, optarg, sizeof(filename) - 1);
}
else if (ch == 'v')
{
verbose = 1;
}
else if (ch == 'c')
{
strncpy(device, optarg, sizeof(device) - 1);
}
else if (ch == 'p')
{
print_path = 1;
strncpy(filename, optarg, sizeof(filename) - 1);
}
else
{
fprintf(stderr, "Usage: %s -f datafile [ -v ] \n", argv[0]);
return 1;
}
}
if (filename[0] == 0)
{
fprintf(stderr, "Usage: %s -f datafile [ -v ] \n", argv[0]);
return 1;
}
param = malloc(sizeof(ventoy_os_param));
if (NULL == param)
{
fprintf(stderr, "failed to alloc memory with size %d error %d\n",
(int)sizeof(ventoy_os_param), errno);
return 1;
}
memset(param, 0, sizeof(ventoy_os_param));
debug("get os pararm from file %s\n", filename);
rc = vtoy_os_param_from_file(filename, param);
if (rc)
{
debug("ventoy os param not found %d\n", rc);
goto end;
}
if (verbose)
{
vtoy_dump_os_param(param);
}
if (print_path)
{
rc = vtoy_printf_iso_path(param);
}
else if (device[0])
{
rc = vtoy_check_device(param, device);
}
else
{
// print os param, you can change the output format in the function
rc = vtoy_print_os_param(param, diskname);
}
end:
if (param)
{
free(param);
}
return rc;
}
// wrapper main
#ifndef BUILD_VTOY_TOOL
int main(int argc, char **argv)
{
return vtoydump_main(argc, argv);
}
#endif
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