forked from omnirom/android_bootable_recovery
/
partition.cpp
1891 lines (1701 loc) · 53.8 KB
/
partition.cpp
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/*
Copyright 2013 TeamWin
This file is part of TWRP/TeamWin Recovery Project.
TWRP 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.
TWRP 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 TWRP. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/mount.h>
#include <unistd.h>
#include <dirent.h>
#include <iostream>
#include <sstream>
#ifdef TW_INCLUDE_CRYPTO
#include "cutils/properties.h"
#endif
#include "libblkid/blkid.h"
#include "variables.h"
#include "twcommon.h"
#include "partitions.hpp"
#include "data.hpp"
#include "twrp-functions.hpp"
#include "twrpDigest.hpp"
#include "twrpTar.hpp"
#include "twrpDU.hpp"
#include "fixPermissions.hpp"
extern "C" {
#include "mtdutils/mtdutils.h"
#include "mtdutils/mounts.h"
#ifdef TW_INCLUDE_CRYPTO_SAMSUNG
#include "crypto/libcrypt_samsung/include/libcrypt_samsung.h"
#endif
#ifdef USE_EXT4
#include "make_ext4fs.h"
#endif
}
#ifdef HAVE_SELINUX
#include "selinux/selinux.h"
#include <selinux/label.h>
#endif
using namespace std;
extern struct selabel_handle *selinux_handle;
struct flag_list {
const char *name;
unsigned flag;
};
static struct flag_list mount_flags[] = {
{ "noatime", MS_NOATIME },
{ "noexec", MS_NOEXEC },
{ "nosuid", MS_NOSUID },
{ "nodev", MS_NODEV },
{ "nodiratime", MS_NODIRATIME },
{ "ro", MS_RDONLY },
{ "rw", 0 },
{ "remount", MS_REMOUNT },
{ "bind", MS_BIND },
{ "rec", MS_REC },
#ifdef MS_UNBINDABLE
{ "unbindable", MS_UNBINDABLE },
#endif
#ifdef MS_PRIVATE
{ "private", MS_PRIVATE },
#endif
#ifdef MS_SLAVE
{ "slave", MS_SLAVE },
#endif
#ifdef MS_SHARED
{ "shared", MS_SHARED },
#endif
{ "sync", MS_SYNCHRONOUS },
{ "defaults", 0 },
{ 0, 0 },
};
TWPartition::TWPartition(void) {
Can_Be_Mounted = false;
Can_Be_Wiped = false;
Can_Be_Backed_Up = false;
Use_Rm_Rf = false;
Wipe_During_Factory_Reset = false;
Wipe_Available_in_GUI = false;
Is_SubPartition = false;
Has_SubPartition = false;
SubPartition_Of = "";
Symlink_Path = "";
Symlink_Mount_Point = "";
Mount_Point = "";
Backup_Path = "";
Actual_Block_Device = "";
Primary_Block_Device = "";
Alternate_Block_Device = "";
Removable = false;
Is_Present = false;
Length = 0;
Size = 0;
Used = 0;
Free = 0;
Backup_Size = 0;
Can_Be_Encrypted = false;
Is_Encrypted = false;
Is_Decrypted = false;
Decrypted_Block_Device = "";
Display_Name = "";
Backup_Display_Name = "";
Storage_Name = "";
Backup_Name = "";
Backup_FileName = "";
MTD_Name = "";
EMMC_Name = "";
Backup_Method = NONE;
Can_Encrypt_Backup = false;
Use_Userdata_Encryption = false;
Has_Data_Media = false;
Has_Android_Secure = false;
Is_Storage = false;
Is_Settings_Storage = false;
Storage_Path = "";
Current_File_System = "";
Fstab_File_System = "";
Mount_Flags = 0;
Mount_Options = "";
Format_Block_Size = 0;
Ignore_Blkid = false;
Retain_Layout_Version = false;
#ifdef TW_INCLUDE_CRYPTO_SAMSUNG
EcryptFS_Password = "";
#endif
}
TWPartition::~TWPartition(void) {
// Do nothing
}
bool TWPartition::Process_Fstab_Line(string Line, bool Display_Error) {
char full_line[MAX_FSTAB_LINE_LENGTH], item[MAX_FSTAB_LINE_LENGTH];
int line_len = Line.size(), index = 0, item_index = 0;
char* ptr;
string Flags;
strncpy(full_line, Line.c_str(), line_len);
bool skip = false;
for (index = 0; index < line_len; index++) {
if (full_line[index] == 34)
skip = !skip;
if (!skip && full_line[index] <= 32)
full_line[index] = '\0';
}
Mount_Point = full_line;
LOGINFO("Processing '%s'\n", Mount_Point.c_str());
Backup_Path = Mount_Point;
Storage_Path = Mount_Point;
Display_Name = full_line + 1;
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
index = Mount_Point.size();
while (index < line_len) {
while (index < line_len && full_line[index] == '\0')
index++;
if (index >= line_len)
continue;
ptr = full_line + index;
if (item_index == 0) {
// File System
Fstab_File_System = ptr;
Current_File_System = ptr;
item_index++;
} else if (item_index == 1) {
// Primary Block Device
if (Fstab_File_System == "mtd" || Fstab_File_System == "yaffs2") {
MTD_Name = ptr;
Find_MTD_Block_Device(MTD_Name);
} else if (Fstab_File_System == "bml") {
if (Mount_Point == "/boot")
MTD_Name = "boot";
else if (Mount_Point == "/recovery")
MTD_Name = "recovery";
Primary_Block_Device = ptr;
if (*ptr != '/')
LOGERR("Until we get better BML support, you will have to find and provide the full block device path to the BML devices e.g. /dev/block/bml9 instead of the partition name\n");
} else if (*ptr != '/') {
if (Display_Error)
LOGERR("Invalid block device on '%s', '%s', %i\n", Line.c_str(), ptr, index);
else
LOGINFO("Invalid block device on '%s', '%s', %i\n", Line.c_str(), ptr, index);
return 0;
} else if (sizeof(*ptr) > 5 && !strncmp(ptr, "emmc@", 5)) {
EMMC_Name = ptr + 5;
Find_EMMC_Block_Device(EMMC_name);
} else {
Primary_Block_Device = ptr;
Find_Real_Block_Device(Primary_Block_Device, Display_Error);
}
item_index++;
} else if (item_index > 1) {
if (*ptr == '/') {
// Alternate Block Device
Alternate_Block_Device = ptr;
Find_Real_Block_Device(Alternate_Block_Device, Display_Error);
} else if (strlen(ptr) > 7 && strncmp(ptr, "length=", 7) == 0) {
// Partition length
ptr += 7;
Length = atoi(ptr);
} else if (strlen(ptr) > 6 && strncmp(ptr, "flags=", 6) == 0) {
// Custom flags, save for later so that new values aren't overwritten by defaults
ptr += 6;
Flags = ptr;
Process_Flags(Flags, Display_Error);
} else if (strlen(ptr) == 4 && (strncmp(ptr, "NULL", 4) == 0 || strncmp(ptr, "null", 4) == 0 || strncmp(ptr, "null", 4) == 0)) {
// Do nothing
} else {
// Unhandled data
LOGINFO("Unhandled fstab information: '%s', %i, line: '%s'\n", ptr, index, Line.c_str());
}
}
while (index < line_len && full_line[index] != '\0')
index++;
}
if (!Is_File_System(Fstab_File_System) && !Is_Image(Fstab_File_System)) {
if (Display_Error)
LOGERR("Unknown File System: '%s'\n", Fstab_File_System.c_str());
else
LOGINFO("Unknown File System: '%s'\n", Fstab_File_System.c_str());
return 0;
} else if (Is_File_System(Fstab_File_System)) {
Find_Actual_Block_Device();
Setup_File_System(Display_Error);
if (Mount_Point == "/system") {
Display_Name = "System";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = true;
Can_Be_Backed_Up = true;
} else if (Mount_Point == "/data") {
Display_Name = "Data";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = true;
Wipe_During_Factory_Reset = true;
Can_Be_Backed_Up = true;
Can_Encrypt_Backup = true;
Use_Userdata_Encryption = true;
#ifdef RECOVERY_SDCARD_ON_DATA
Storage_Name = "Internal Storage";
Has_Data_Media = true;
Is_Storage = true;
Is_Settings_Storage = true;
Storage_Path = "/data/media";
Symlink_Path = Storage_Path;
if (strcmp(EXPAND(TW_EXTERNAL_STORAGE_PATH), "/sdcard") == 0) {
Make_Dir("/emmc", Display_Error);
Symlink_Mount_Point = "/emmc";
} else {
Make_Dir("/sdcard", Display_Error);
Symlink_Mount_Point = "/sdcard";
}
if (Mount(false) && TWFunc::Path_Exists("/data/media/0")) {
Storage_Path = "/data/media/0";
Symlink_Path = Storage_Path;
DataManager::SetValue(TW_INTERNAL_PATH, "/data/media/0");
UnMount(true);
}
#endif
#ifdef TW_INCLUDE_CRYPTO
Can_Be_Encrypted = true;
char crypto_blkdev[255];
property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, "error");
if (strcmp(crypto_blkdev, "error") != 0) {
DataManager::SetValue(TW_DATA_BLK_DEVICE, Primary_Block_Device);
DataManager::SetValue(TW_IS_DECRYPTED, 1);
Is_Encrypted = true;
Is_Decrypted = true;
Decrypted_Block_Device = crypto_blkdev;
LOGINFO("Data already decrypted, new block device: '%s'\n", crypto_blkdev);
} else if (!Mount(false)) {
Is_Encrypted = true;
Is_Decrypted = false;
Can_Be_Mounted = false;
Current_File_System = "emmc";
Setup_Image(Display_Error);
DataManager::SetValue(TW_IS_ENCRYPTED, 1);
DataManager::SetValue(TW_CRYPTO_PASSWORD, "");
DataManager::SetValue("tw_crypto_display", "");
} else {
// Filesystem is not encrypted and the mount
// succeeded, so get it back to the original
// unmounted state
UnMount(false);
}
#ifdef RECOVERY_SDCARD_ON_DATA
if (!Is_Encrypted || (Is_Encrypted && Is_Decrypted))
Recreate_Media_Folder();
#endif
#else
#ifdef RECOVERY_SDCARD_ON_DATA
Recreate_Media_Folder();
#endif
#endif
} else if (Mount_Point == "/cache") {
Display_Name = "Cache";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = true;
Wipe_During_Factory_Reset = true;
Can_Be_Backed_Up = true;
if (Mount(false) && !TWFunc::Path_Exists("/cache/recovery/.")) {
LOGINFO("Recreating /cache/recovery folder.\n");
if (mkdir("/cache/recovery", S_IRWXU | S_IRWXG | S_IWGRP | S_IXGRP) != 0)
return -1;
}
} else if (Mount_Point == "/datadata") {
Wipe_During_Factory_Reset = true;
Display_Name = "DataData";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Is_SubPartition = true;
SubPartition_Of = "/data";
DataManager::SetValue(TW_HAS_DATADATA, 1);
Can_Be_Backed_Up = true;
Can_Encrypt_Backup = true;
Use_Userdata_Encryption = false; // This whole partition should be encrypted
} else if (Mount_Point == "/sd-ext") {
Wipe_During_Factory_Reset = true;
Display_Name = "SD-Ext";
Backup_Display_Name = Display_Name;
Storage_Name = Display_Name;
Wipe_Available_in_GUI = true;
Removable = true;
Can_Be_Backed_Up = true;
Can_Encrypt_Backup = true;
Use_Userdata_Encryption = true;
} else if (Mount_Point == "/boot") {
Display_Name = "Boot";
Backup_Display_Name = Display_Name;
DataManager::SetValue("tw_boot_is_mountable", 1);
Can_Be_Backed_Up = true;
}
#ifdef TW_EXTERNAL_STORAGE_PATH
if (Mount_Point == EXPAND(TW_EXTERNAL_STORAGE_PATH)) {
Is_Storage = true;
Storage_Path = EXPAND(TW_EXTERNAL_STORAGE_PATH);
Removable = true;
Wipe_Available_in_GUI = true;
#else
if (Mount_Point == "/sdcard" || Mount_Point == "/external_sd" || Mount_Point == "/external_sdcard") {
Is_Storage = true;
Removable = true;
Wipe_Available_in_GUI = true;
#endif
}
#ifdef TW_INTERNAL_STORAGE_PATH
if (Mount_Point == EXPAND(TW_INTERNAL_STORAGE_PATH)) {
Is_Storage = true;
Is_Settings_Storage = true;
Storage_Path = EXPAND(TW_INTERNAL_STORAGE_PATH);
Wipe_Available_in_GUI = true;
}
#else
if (Mount_Point == "/emmc" || Mount_Point == "/internal_sd" || Mount_Point == "/internal_sdcard") {
Is_Storage = true;
Is_Settings_Storage = true;
Wipe_Available_in_GUI = true;
}
#endif
} else if (Is_Image(Fstab_File_System)) {
Find_Actual_Block_Device();
Setup_Image(Display_Error);
if (Mount_Point == "/boot") {
Display_Name = "Boot";
Backup_Display_Name = Display_Name;
Can_Be_Backed_Up = true;
} else if (Mount_Point == "/recovery") {
Display_Name = "Recovery";
Backup_Display_Name = Display_Name;
}
}
// Process any custom flags
if (Flags.size() > 0)
Process_Flags(Flags, Display_Error);
return true;
}
bool TWPartition::Process_FS_Flags(string& Options, int Flags) {
int i;
char *p;
char *savep;
char fs_options[250];
strlcpy(fs_options, Options.c_str(), sizeof(fs_options));
Options = "";
p = strtok_r(fs_options, ",", &savep);
while (p) {
/* Look for the flag "p" in the flag list "fl"
* If not found, the loop exits with fl[i].name being null.
*/
for (i = 0; mount_flags[i].name; i++) {
if (strncmp(p, mount_flags[i].name, strlen(mount_flags[i].name)) == 0) {
Flags |= mount_flags[i].flag;
break;
}
}
if (!mount_flags[i].name) {
if (Options.size() > 0)
Options += ",";
Options += p;
}
p = strtok_r(NULL, ",", &savep);
}
return true;
}
bool TWPartition::Process_Flags(string Flags, bool Display_Error) {
char flags[MAX_FSTAB_LINE_LENGTH];
int flags_len, index = 0, ptr_len;
char* ptr;
bool skip = false, has_display_name = false, has_storage_name = false, has_backup_name = false;
strcpy(flags, Flags.c_str());
flags_len = Flags.size();
for (index = 0; index < flags_len; index++) {
if (flags[index] == 34)
skip = !skip;
if (!skip && flags[index] == ';')
flags[index] = '\0';
}
index = 0;
while (index < flags_len) {
while (index < flags_len && flags[index] == '\0')
index++;
if (index >= flags_len)
continue;
ptr = flags + index;
ptr_len = strlen(ptr);
if (strcmp(ptr, "removable") == 0) {
Removable = true;
} else if (strncmp(ptr, "storage", 7) == 0) {
if (ptr_len == 7) {
LOGINFO("ptr_len is 7, storage set to true\n");
Is_Storage = true;
} else if (ptr_len == 9) {
ptr += 9;
if (*ptr == '1' || *ptr == 'y' || *ptr == 'Y') {
LOGINFO("storage set to true\n");
Is_Storage = true;
} else {
LOGINFO("storage set to false\n");
Is_Storage = false;
}
}
} else if (strcmp(ptr, "settingsstorage") == 0) {
Is_Storage = true;
} else if (strcmp(ptr, "canbewiped") == 0) {
Can_Be_Wiped = true;
} else if (strcmp(ptr, "usermrf") == 0) {
Use_Rm_Rf = true;
} else if (ptr_len > 7 && strncmp(ptr, "backup=", 7) == 0) {
ptr += 7;
if (*ptr == '1' || *ptr == 'y' || *ptr == 'Y')
Can_Be_Backed_Up = true;
else
Can_Be_Backed_Up = false;
} else if (strcmp(ptr, "wipeingui") == 0) {
Can_Be_Wiped = true;
Wipe_Available_in_GUI = true;
} else if (strcmp(ptr, "wipeduringfactoryreset") == 0) {
Can_Be_Wiped = true;
Wipe_Available_in_GUI = true;
Wipe_During_Factory_Reset = true;
} else if (ptr_len > 15 && strncmp(ptr, "subpartitionof=", 15) == 0) {
ptr += 15;
Is_SubPartition = true;
SubPartition_Of = ptr;
} else if (strcmp(ptr, "ignoreblkid") == 0) {
Ignore_Blkid = true;
} else if (strcmp(ptr, "retainlayoutversion") == 0) {
Retain_Layout_Version = true;
} else if (ptr_len > 8 && strncmp(ptr, "symlink=", 8) == 0) {
ptr += 8;
Symlink_Path = ptr;
} else if (ptr_len > 8 && strncmp(ptr, "display=", 8) == 0) {
has_display_name = true;
ptr += 8;
if (*ptr == '\"') ptr++;
Display_Name = ptr;
if (Display_Name.substr(Display_Name.size() - 1, 1) == "\"") {
Display_Name.resize(Display_Name.size() - 1);
}
} else if (ptr_len > 11 && strncmp(ptr, "storagename=", 11) == 0) {
has_storage_name = true;
ptr += 11;
if (*ptr == '\"') ptr++;
Storage_Name = ptr;
if (Storage_Name.substr(Storage_Name.size() - 1, 1) == "\"") {
Storage_Name.resize(Storage_Name.size() - 1);
}
} else if (ptr_len > 11 && strncmp(ptr, "backupname=", 10) == 0) {
has_backup_name = true;
ptr += 10;
if (*ptr == '\"') ptr++;
Backup_Display_Name = ptr;
if (Backup_Display_Name.substr(Backup_Display_Name.size() - 1, 1) == "\"") {
Backup_Display_Name.resize(Backup_Display_Name.size() - 1);
}
} else if (ptr_len > 10 && strncmp(ptr, "blocksize=", 10) == 0) {
ptr += 10;
Format_Block_Size = atoi(ptr);
} else if (ptr_len > 7 && strncmp(ptr, "length=", 7) == 0) {
ptr += 7;
Length = atoi(ptr);
} else if (ptr_len > 17 && strncmp(ptr, "canencryptbackup=", 17) == 0) {
ptr += 17;
if (*ptr == '1' || *ptr == 'y' || *ptr == 'Y')
Can_Encrypt_Backup = true;
else
Can_Encrypt_Backup = false;
} else if (ptr_len > 21 && strncmp(ptr, "userdataencryptbackup=", 21) == 0) {
ptr += 21;
if (*ptr == '1' || *ptr == 'y' || *ptr == 'Y') {
Can_Encrypt_Backup = true;
Use_Userdata_Encryption = true;
} else {
Use_Userdata_Encryption = false;
}
} else if (ptr_len > 8 && strncmp(ptr, "fsflags=", 8) == 0) {
ptr += 8;
if (*ptr == '\"') ptr++;
Mount_Options = ptr;
if (Mount_Options.substr(Mount_Options.size() - 1, 1) == "\"") {
Mount_Options.resize(Mount_Options.size() - 1);
}
Process_FS_Flags(Mount_Options, Mount_Flags);
} else {
if (Display_Error)
LOGERR("Unhandled flag: '%s'\n", ptr);
else
LOGINFO("Unhandled flag: '%s'\n", ptr);
}
while (index < flags_len && flags[index] != '\0')
index++;
}
if (has_display_name && !has_storage_name)
Storage_Name = Display_Name;
if (!has_display_name && has_storage_name)
Display_Name = Storage_Name;
if (has_display_name && !has_backup_name && Backup_Display_Name != "Android Secure")
Backup_Display_Name = Display_Name;
if (!has_display_name && has_backup_name)
Display_Name = Backup_Display_Name;
return true;
}
bool TWPartition::Is_File_System(string File_System) {
if (File_System == "ext2" ||
File_System == "ext3" ||
File_System == "ext4" ||
File_System == "vfat" ||
File_System == "ntfs" ||
File_System == "yaffs2" ||
File_System == "exfat" ||
File_System == "f2fs" ||
File_System == "auto")
return true;
else
return false;
}
bool TWPartition::Is_Image(string File_System) {
if (File_System == "emmc" || File_System == "mtd" || File_System == "bml")
return true;
else
return false;
}
bool TWPartition::Make_Dir(string Path, bool Display_Error) {
if (!TWFunc::Path_Exists(Path)) {
if (mkdir(Path.c_str(), 0777) == -1) {
if (Display_Error)
LOGERR("Can not create '%s' folder.\n", Path.c_str());
else
LOGINFO("Can not create '%s' folder.\n", Path.c_str());
return false;
} else {
LOGINFO("Created '%s' folder.\n", Path.c_str());
return true;
}
}
return true;
}
void TWPartition::Setup_File_System(bool Display_Error) {
struct statfs st;
Can_Be_Mounted = true;
Can_Be_Wiped = true;
// Make the mount point folder if it doesn't exist
Make_Dir(Mount_Point, Display_Error);
Display_Name = Mount_Point.substr(1, Mount_Point.size() - 1);
Backup_Name = Display_Name;
Backup_Method = FILES;
}
void TWPartition::Setup_Image(bool Display_Error) {
Display_Name = Mount_Point.substr(1, Mount_Point.size() - 1);
Backup_Name = Display_Name;
if (Current_File_System == "emmc")
Backup_Method = DD;
else if (Current_File_System == "mtd" || Current_File_System == "bml")
Backup_Method = FLASH_UTILS;
else
LOGINFO("Unhandled file system '%s' on image '%s'\n", Current_File_System.c_str(), Display_Name.c_str());
if (Find_Partition_Size()) {
Used = Size;
Backup_Size = Size;
} else {
if (Display_Error)
LOGERR("Unable to find partition size for '%s'\n", Mount_Point.c_str());
else
LOGINFO("Unable to find partition size for '%s'\n", Mount_Point.c_str());
}
}
void TWPartition::Setup_AndSec(void) {
Backup_Display_Name = "Android Secure";
Backup_Name = "and-sec";
Can_Be_Backed_Up = true;
Has_Android_Secure = true;
Symlink_Path = Mount_Point + "/.android_secure";
Symlink_Mount_Point = "/and-sec";
Backup_Path = Symlink_Mount_Point;
Make_Dir("/and-sec", true);
Recreate_AndSec_Folder();
Mount_Storage_Retry();
}
void TWPartition::Find_Real_Block_Device(string& Block, bool Display_Error) {
char device[512], realDevice[512];
strcpy(device, Block.c_str());
memset(realDevice, 0, sizeof(realDevice));
while (readlink(device, realDevice, sizeof(realDevice)) > 0)
{
strcpy(device, realDevice);
memset(realDevice, 0, sizeof(realDevice));
}
if (device[0] != '/') {
if (Display_Error)
LOGERR("Invalid symlink path '%s' found on block device '%s'\n", device, Block.c_str());
else
LOGINFO("Invalid symlink path '%s' found on block device '%s'\n", device, Block.c_str());
return;
} else {
Block = device;
return;
}
}
void TWPartition::Mount_Storage_Retry(void) {
// On some devices, storage doesn't want to mount right away, retry and sleep
if (!Mount(true)) {
int retry_count = 5;
while (retry_count > 0 && !Mount(false)) {
usleep(500000);
retry_count--;
}
Mount(true);
}
}
bool TWPartition::Find_MTD_Block_Device(string MTD_Name) {
FILE *fp = NULL;
char line[255];
fp = fopen("/proc/mtd", "rt");
if (fp == NULL) {
LOGERR("Device does not support /proc/mtd\n");
return false;
}
while (fgets(line, sizeof(line), fp) != NULL)
{
char device[32], label[32];
unsigned long size = 0;
char* fstype = NULL;
int deviceId;
sscanf(line, "%s %lx %*s %*c%s", device, &size, label);
// Skip header and blank lines
if ((strcmp(device, "dev:") == 0) || (strlen(line) < 8))
continue;
// Strip off the trailing " from the label
label[strlen(label)-1] = '\0';
if (strcmp(label, MTD_Name.c_str()) == 0) {
// We found our device
// Strip off the trailing : from the device
device[strlen(device)-1] = '\0';
if (sscanf(device,"mtd%d", &deviceId) == 1) {
sprintf(device, "/dev/block/mtdblock%d", deviceId);
Primary_Block_Device = device;
fclose(fp);
return true;
}
}
}
fclose(fp);
return false;
}
bool TWPartition::Find_EMMC_Block_Device(string EMMC_Name) {
FILE *fp = NULL;
char line[255];
fp = fopen("/proc/emmc", "rt");
if (fp == NULL) {
LOGERR("Device does not support /proc/emmc\n");
return false;
}
while (fgets(line, sizeof(line), fp) != NULL)
{
char device[32], label[32];
unsigned long size = 0;
char* fstype = NULL;
int deviceId;
sscanf(line, "%s %lx %*s %*c%s", device, &size, label);
// Skip header and blank lines
if ((strcmp(device, "dev:") == 0) || (strlen(line) < 8))
continue;
// Strip off the trailing " from the label
label[strlen(label)-1] = '\0';
if (strcmp(label, EMMC_Name.c_str()) == 0) {
// We found our device
// Strip off the trailing : from the device
device[strlen(device)-1] = '\0';
if (sscanf(device,"mmcblk0p%d", &deviceId) == 1) {
sprintf(device, "/dev/block/mmcblock0p%d", deviceId);
Primary_Block_Device = device;
fclose(fp);
return true;
}
}
}
fclose(fp);
return false;
}
bool TWPartition::Get_Size_Via_statfs(bool Display_Error) {
struct statfs st;
string Local_Path = Mount_Point + "/.";
if (!Mount(Display_Error))
return false;
if (statfs(Local_Path.c_str(), &st) != 0) {
if (!Removable) {
if (Display_Error)
LOGERR("Unable to statfs '%s'\n", Local_Path.c_str());
else
LOGINFO("Unable to statfs '%s'\n", Local_Path.c_str());
}
return false;
}
Size = (st.f_blocks * st.f_bsize);
Used = ((st.f_blocks - st.f_bfree) * st.f_bsize);
Free = (st.f_bfree * st.f_bsize);
Backup_Size = Used;
return true;
}
bool TWPartition::Get_Size_Via_df(bool Display_Error) {
FILE* fp;
char command[255], line[512];
int include_block = 1;
unsigned int min_len;
if (!Mount(Display_Error))
return false;
min_len = Actual_Block_Device.size() + 2;
sprintf(command, "df %s > /tmp/dfoutput.txt", Mount_Point.c_str());
TWFunc::Exec_Cmd(command);
fp = fopen("/tmp/dfoutput.txt", "rt");
if (fp == NULL) {
LOGINFO("Unable to open /tmp/dfoutput.txt.\n");
return false;
}
while (fgets(line, sizeof(line), fp) != NULL)
{
unsigned long blocks, used, available;
char device[64];
char tmpString[64];
if (strncmp(line, "Filesystem", 10) == 0)
continue;
if (strlen(line) < min_len) {
include_block = 0;
continue;
}
if (include_block) {
sscanf(line, "%s %lu %lu %lu", device, &blocks, &used, &available);
} else {
// The device block string is so long that the df information is on the next line
int space_count = 0;
sprintf(tmpString, "/dev/block/%s", Actual_Block_Device.c_str());
while (tmpString[space_count] == 32)
space_count++;
sscanf(line + space_count, "%lu %lu %lu", &blocks, &used, &available);
}
// Adjust block size to byte size
Size = blocks * 1024ULL;
Used = used * 1024ULL;
Free = available * 1024ULL;
Backup_Size = Used;
}
fclose(fp);
return true;
}
bool TWPartition::Find_Partition_Size(void) {
FILE* fp;
char line[512];
string tmpdevice;
fp = fopen("/proc/dumchar_info", "rt");
if (fp != NULL) {
while (fgets(line, sizeof(line), fp) != NULL)
{
char label[32], device[32];
unsigned long size = 0;
sscanf(line, "%s %lx %*lx %*lu %s", label, &size, device);
// Skip header, annotation and blank lines
if ((strncmp(device, "/dev/", 5) != 0) || (strlen(line) < 8))
continue;
tmpdevice = "/dev/";
tmpdevice += label;
if (tmpdevice == Primary_Block_Device || tmpdevice == Alternate_Block_Device) {
Size = size;
fclose(fp);
return true;
}
}
}
// In this case, we'll first get the partitions we care about (with labels)
fp = fopen("/proc/partitions", "rt");
if (fp == NULL)
return false;
while (fgets(line, sizeof(line), fp) != NULL)
{
unsigned long major, minor, blocks;
char device[512];
char tmpString[64];
if (strlen(line) < 7 || line[0] == 'm') continue;
sscanf(line + 1, "%lu %lu %lu %s", &major, &minor, &blocks, device);
tmpdevice = "/dev/block/";
tmpdevice += device;
if (tmpdevice == Primary_Block_Device || tmpdevice == Alternate_Block_Device) {
// Adjust block size to byte size
Size = blocks * 1024ULL;
fclose(fp);
return true;
}
}
fclose(fp);
return false;
}
bool TWPartition::Is_Mounted(void) {
if (!Can_Be_Mounted)
return false;
struct stat st1, st2;
string test_path;
// Check to see if the mount point directory exists
test_path = Mount_Point + "/.";
if (stat(test_path.c_str(), &st1) != 0) return false;
// Check to see if the directory above the mount point exists
test_path = Mount_Point + "/../.";
if (stat(test_path.c_str(), &st2) != 0) return false;
// Compare the device IDs -- if they match then we're (probably) using tmpfs instead of an actual device
int ret = (st1.st_dev != st2.st_dev) ? true : false;
return ret;
}
bool TWPartition::Mount(bool Display_Error) {
int exfat_mounted = 0;
if (Is_Mounted()) {
return true;
} else if (!Can_Be_Mounted) {
return false;
}
Find_Actual_Block_Device();
// Check the current file system before mounting
Check_FS_Type();
if (Current_File_System == "exfat" && TWFunc::Path_Exists("/sbin/exfat-fuse")) {
string cmd = "/sbin/exfat-fuse -o big_writes,max_read=131072,max_write=131072 " + Actual_Block_Device + " " + Mount_Point;
LOGINFO("cmd: %s\n", cmd.c_str());
string result;
if (TWFunc::Exec_Cmd(cmd, result) != 0) {
LOGINFO("exfat-fuse failed to mount with result '%s', trying vfat\n", result.c_str());
Current_File_System = "vfat";
} else {
#ifdef TW_NO_EXFAT_FUSE
UnMount(false);
// We'll let the kernel handle it but using exfat-fuse to detect if the file system is actually exfat
// Some kernels let us mount vfat as exfat which doesn't work out too well
#else
exfat_mounted = 1;
#endif
}
}
if (Fstab_File_System == "yaffs2") {
// mount an MTD partition as a YAFFS2 filesystem.
const unsigned long flags = MS_NOATIME | MS_NODEV | MS_NODIRATIME;
if (mount(Actual_Block_Device.c_str(), Mount_Point.c_str(), Fstab_File_System.c_str(), flags, NULL) < 0) {
if (mount(Actual_Block_Device.c_str(), Mount_Point.c_str(), Fstab_File_System.c_str(), flags | MS_RDONLY, NULL) < 0) {
if (Display_Error)
LOGERR("Failed to mount '%s' (MTD)\n", Mount_Point.c_str());
else
LOGINFO("Failed to mount '%s' (MTD)\n", Mount_Point.c_str());
return false;
} else {
LOGINFO("Mounted '%s' (MTD) as RO\n", Mount_Point.c_str());
return true;
}
} else {
struct stat st;
string test_path = Mount_Point;
if (stat(test_path.c_str(), &st) < 0) {
if (Display_Error)
LOGERR("Failed to mount '%s' (MTD)\n", Mount_Point.c_str());
else
LOGINFO("Failed to mount '%s' (MTD)\n", Mount_Point.c_str());
return false;
}
mode_t new_mode = st.st_mode | S_IXUSR | S_IXGRP | S_IXOTH;
if (new_mode != st.st_mode) {
LOGINFO("Fixing execute permissions for %s\n", Mount_Point.c_str());
if (chmod(Mount_Point.c_str(), new_mode) < 0) {
if (Display_Error)
LOGERR("Couldn't fix permissions for %s: %s\n", Mount_Point.c_str(), strerror(errno));
else
LOGINFO("Couldn't fix permissions for %s: %s\n", Mount_Point.c_str(), strerror(errno));
return false;
}
}
return true;
}