main.cpp - platform/system/vold - Git at Google

 /*
  * Copyright (C) 2008 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #define ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER

 #include "FsCrypt.h"
 #include "MetadataCrypt.h"
 #include "NetlinkManager.h"
 #include "VoldNativeService.h"
 #include "VoldUtil.h"
 #include "VolumeManager.h"
 #include "model/Disk.h"
 #include "sehandle.h"

 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <cutils/klog.h>
 #include <hidl/HidlTransportSupport.h>
 #include <utils/Trace.h>

 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fs_mgr.h>
 #include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>

 typedef struct vold_configs {
     bool has_adoptable : 1;
     bool has_quota : 1;
     bool has_reserved : 1;
     bool has_compress : 1;
 } VoldConfigs;

 static int process_config(VolumeManager* vm, VoldConfigs* configs);
 static void coldboot(const char* path);
 static void parse_args(int argc, char** argv);
 static void VoldLogger(android::base::LogId log_buffer_id, android::base::LogSeverity severity,
                        const char* tag, const char* file, unsigned int line, const char* message);

 struct selabel_handle* sehandle;
 android::base::LogdLogger logd_logger(android::base::SYSTEM);

 using android::base::StringPrintf;
 using android::fs_mgr::ReadDefaultFstab;

 int main(int argc, char** argv) {
     atrace_set_tracing_enabled(false);
     setenv("ANDROID_LOG_TAGS", "*:d", 1);  // Do not submit with verbose logs enabled
     android::base::InitLogging(argv, &VoldLogger);

     LOG(INFO) << "Vold 3.0 (the awakening) firing up";

     ATRACE_BEGIN("main");

     LOG(DEBUG) << "Detected support for:"
                << (android::vold::IsFilesystemSupported("ext4") ? " ext4" : "")
                << (android::vold::IsFilesystemSupported("f2fs") ? " f2fs" : "")
                << (android::vold::IsFilesystemSupported("vfat") ? " vfat" : "");

     VolumeManager* vm;
     NetlinkManager* nm;

     parse_args(argc, argv);

     sehandle = selinux_android_file_context_handle();
     if (!sehandle) {
         LOG(ERROR) << "Failed to get SELinux file contexts handle";
         exit(1);
     }
     selinux_android_set_sehandle(sehandle);

     mkdir("/dev/block/vold", 0755);

     /* For when cryptfs checks and mounts an encrypted filesystem */
     klog_set_level(6);

     /* Create our singleton managers */
     if (!(vm = VolumeManager::Instance())) {
         LOG(ERROR) << "Unable to create VolumeManager";
         exit(1);
     }

     if (!(nm = NetlinkManager::Instance())) {
         LOG(ERROR) << "Unable to create NetlinkManager";
         exit(1);
     }

     if (android::base::GetBoolProperty("vold.debug", false)) {
         vm->setDebug(true);
     }

     if (vm->start()) {
         PLOG(ERROR) << "Unable to start VolumeManager";
         exit(1);
     }

     VoldConfigs configs = {};
     if (process_config(vm, &configs)) {
         PLOG(ERROR) << "Error reading configuration... continuing anyways";
     }

     android::hardware::configureRpcThreadpool(1, false /* callerWillJoin */);

     ATRACE_BEGIN("VoldNativeService::start");
     if (android::vold::VoldNativeService::start() != android::OK) {
         LOG(ERROR) << "Unable to start VoldNativeService";
         exit(1);
     }
     ATRACE_END();

     LOG(DEBUG) << "VoldNativeService::start() completed OK";

     ATRACE_BEGIN("NetlinkManager::start");
     if (nm->start()) {
         PLOG(ERROR) << "Unable to start NetlinkManager";
         exit(1);
     }
     ATRACE_END();

     // This call should go after listeners are started to avoid
     // a deadlock between vold and init (see b/34278978 for details)
     android::base::SetProperty("vold.has_adoptable", configs.has_adoptable ? "1" : "0");
     android::base::SetProperty("vold.has_quota", configs.has_quota ? "1" : "0");
     android::base::SetProperty("vold.has_reserved", configs.has_reserved ? "1" : "0");
     android::base::SetProperty("vold.has_compress", configs.has_compress ? "1" : "0");

     // Do coldboot here so it won't block booting,
     // also the cold boot is needed in case we have flash drive
     // connected before Vold launched
     coldboot("/sys/block");

     ATRACE_END();

     android::IPCThreadState::self()->joinThreadPool();
     LOG(INFO) << "vold shutting down";

     exit(0);
 }

 static void parse_args(int argc, char** argv) {
     static struct option opts[] = {
         {"blkid_context", required_argument, 0, 'b'},
         {"blkid_untrusted_context", required_argument, 0, 'B'},
         {"fsck_context", required_argument, 0, 'f'},
         {"fsck_untrusted_context", required_argument, 0, 'F'},
         {nullptr, 0, nullptr, 0},
     };

     int c;
     while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
         switch (c) {
             // clang-format off
         case 'b': android::vold::sBlkidContext = optarg; break;
         case 'B': android::vold::sBlkidUntrustedContext = optarg; break;
         case 'f': android::vold::sFsckContext = optarg; break;
         case 'F': android::vold::sFsckUntrustedContext = optarg; break;
                 // clang-format on
         }
     }

     CHECK(android::vold::sBlkidContext != nullptr);
     CHECK(android::vold::sBlkidUntrustedContext != nullptr);
     CHECK(android::vold::sFsckContext != nullptr);
     CHECK(android::vold::sFsckUntrustedContext != nullptr);
 }

 static void do_coldboot(DIR* d, int lvl) {
     struct dirent* de;
     int dfd, fd;

     dfd = dirfd(d);

     fd = openat(dfd, "uevent", O_WRONLY | O_CLOEXEC);
     if (fd >= 0) {
         write(fd, "add\n", 4);
         close(fd);
     }

     while ((de = readdir(d))) {
         DIR* d2;

         if (de->d_name[0] == '.') continue;

         if (de->d_type != DT_DIR && lvl > 0) continue;

         fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
         if (fd < 0) continue;

         d2 = fdopendir(fd);
         if (d2 == 0)
             close(fd);
         else {
             do_coldboot(d2, lvl + 1);
             closedir(d2);
         }
     }
 }

 static void coldboot(const char* path) {
     ATRACE_NAME("coldboot");
     DIR* d = opendir(path);
     if (d) {
         do_coldboot(d, 0);
         closedir(d);
     }
 }

 static int process_config(VolumeManager* vm, VoldConfigs* configs) {
     ATRACE_NAME("process_config");

     if (!ReadDefaultFstab(&fstab_default)) {
         PLOG(ERROR) << "Failed to open default fstab";
         return -1;
     }

     /* Loop through entries looking for ones that vold manages */
     configs->has_adoptable = false;
     configs->has_quota = false;
     configs->has_reserved = false;
     configs->has_compress = false;
     for (auto& entry : fstab_default) {
         if (entry.fs_mgr_flags.quota) {
             configs->has_quota = true;
         }
         if (entry.reserved_size > 0) {
             configs->has_reserved = true;
         }
         if (entry.fs_mgr_flags.fs_compress) {
             configs->has_compress = true;
         }

         /* Make sure logical partitions have an updated blk_device. */
         if (entry.fs_mgr_flags.logical && !fs_mgr_update_logical_partition(&entry) &&
             !entry.fs_mgr_flags.no_fail) {
             PLOG(FATAL) << "could not find logical partition " << entry.blk_device;
         }

         if (entry.mount_point == "/data" && !entry.metadata_key_dir.empty()) {
             // Pre-populate userdata dm-devices since the uevents are asynchronous (b/198405417).
             android::vold::defaultkey_precreate_dm_device();
         }

         if (entry.fs_mgr_flags.vold_managed) {
             if (entry.fs_mgr_flags.nonremovable) {
                 LOG(WARNING) << "nonremovable no longer supported; ignoring volume";
                 continue;
             }

             std::string sysPattern(entry.blk_device);
             std::string nickname(entry.label);
             int flags = 0;

             if (entry.is_encryptable()) {
                 flags |= android::vold::Disk::Flags::kAdoptable;
                 configs->has_adoptable = true;
             }
             if (entry.fs_mgr_flags.no_emulated_sd ||
                 android::base::GetBoolProperty("vold.debug.default_primary", false)) {
                 flags |= android::vold::Disk::Flags::kDefaultPrimary;
             }

             vm->addDiskSource(std::shared_ptr<VolumeManager::DiskSource>(
                 new VolumeManager::DiskSource(sysPattern, nickname, flags)));
         }
     }
     return 0;
 }

 static void VoldLogger(android::base::LogId log_buffer_id, android::base::LogSeverity severity,
                        const char* tag, const char* file, unsigned int line, const char* message) {
     logd_logger(log_buffer_id, severity, tag, file, line, message);

     if (severity >= android::base::WARNING) {
         static bool early_boot_done = false;

         // If metadata encryption setup (fscrypt_mount_metadata_encrypted) or
         // basic FBE setup (fscrypt_init_user0) fails, then the boot will fail
         // before adb can be started, so logcat won't be available.  To allow
         // debugging these early boot failures, log early errors and warnings to
         // the kernel log.  This allows diagnosing failures via the serial log,
         // or via last dmesg/"fastboot oem dmesg" on devices that support it.
         //
         // As a very quick-and-dirty test for whether /data has been mounted,
         // check whether /data/misc/vold exists.
         if (!early_boot_done) {
             if (access("/data/misc/vold", F_OK) == 0 && fscrypt_init_user0_done) {
                 early_boot_done = true;
                 return;
             }
             android::base::KernelLogger(log_buffer_id, severity, tag, file, line, message);
         }
     }
 }
	/*
	* Copyright (C) 2008 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#define ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER

	#include "FsCrypt.h"
	#include "MetadataCrypt.h"
	#include "NetlinkManager.h"
	#include "VoldNativeService.h"
	#include "VoldUtil.h"
	#include "VolumeManager.h"
	#include "model/Disk.h"
	#include "sehandle.h"

	#include <android-base/logging.h>
	#include <android-base/properties.h>
	#include <android-base/stringprintf.h>
	#include <cutils/klog.h>
	#include <hidl/HidlTransportSupport.h>
	#include <utils/Trace.h>

	#include <dirent.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <fs_mgr.h>
	#include <getopt.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/stat.h>
	#include <sys/types.h>

	typedef struct vold_configs {
	bool has_adoptable : 1;
	bool has_quota : 1;
	bool has_reserved : 1;
	bool has_compress : 1;
	} VoldConfigs;

	static int process_config(VolumeManager* vm, VoldConfigs* configs);
	static void coldboot(const char* path);
	static void parse_args(int argc, char** argv);
	static void VoldLogger(android::base::LogId log_buffer_id, android::base::LogSeverity severity,
	const char* tag, const char* file, unsigned int line, const char* message);

	struct selabel_handle* sehandle;
	android::base::LogdLogger logd_logger(android::base::SYSTEM);

	using android::base::StringPrintf;
	using android::fs_mgr::ReadDefaultFstab;

	int main(int argc, char** argv) {
	atrace_set_tracing_enabled(false);
	setenv("ANDROID_LOG_TAGS", "*:d", 1); // Do not submit with verbose logs enabled
	android::base::InitLogging(argv, &VoldLogger);

	LOG(INFO) << "Vold 3.0 (the awakening) firing up";

	ATRACE_BEGIN("main");

	LOG(DEBUG) << "Detected support for:"
	<< (android::vold::IsFilesystemSupported("ext4") ? " ext4" : "")
	<< (android::vold::IsFilesystemSupported("f2fs") ? " f2fs" : "")
	<< (android::vold::IsFilesystemSupported("vfat") ? " vfat" : "");

	VolumeManager* vm;
	NetlinkManager* nm;

	parse_args(argc, argv);

	sehandle = selinux_android_file_context_handle();
	if (!sehandle) {
	LOG(ERROR) << "Failed to get SELinux file contexts handle";
	exit(1);
	}
	selinux_android_set_sehandle(sehandle);

	mkdir("/dev/block/vold", 0755);

	/* For when cryptfs checks and mounts an encrypted filesystem */
	klog_set_level(6);

	/* Create our singleton managers */
	if (!(vm = VolumeManager::Instance())) {
	LOG(ERROR) << "Unable to create VolumeManager";
	exit(1);
	}

	if (!(nm = NetlinkManager::Instance())) {
	LOG(ERROR) << "Unable to create NetlinkManager";
	exit(1);
	}

	if (android::base::GetBoolProperty("vold.debug", false)) {
	vm->setDebug(true);
	}

	if (vm->start()) {
	PLOG(ERROR) << "Unable to start VolumeManager";
	exit(1);
	}

	VoldConfigs configs = {};
	if (process_config(vm, &configs)) {
	PLOG(ERROR) << "Error reading configuration... continuing anyways";
	}

	android::hardware::configureRpcThreadpool(1, false /* callerWillJoin */);

	ATRACE_BEGIN("VoldNativeService::start");
	if (android::vold::VoldNativeService::start() != android::OK) {
	LOG(ERROR) << "Unable to start VoldNativeService";
	exit(1);
	}
	ATRACE_END();

	LOG(DEBUG) << "VoldNativeService::start() completed OK";

	ATRACE_BEGIN("NetlinkManager::start");
	if (nm->start()) {
	PLOG(ERROR) << "Unable to start NetlinkManager";
	exit(1);
	}
	ATRACE_END();

	// This call should go after listeners are started to avoid
	// a deadlock between vold and init (see b/34278978 for details)
	android::base::SetProperty("vold.has_adoptable", configs.has_adoptable ? "1" : "0");
	android::base::SetProperty("vold.has_quota", configs.has_quota ? "1" : "0");
	android::base::SetProperty("vold.has_reserved", configs.has_reserved ? "1" : "0");
	android::base::SetProperty("vold.has_compress", configs.has_compress ? "1" : "0");

	// Do coldboot here so it won't block booting,
	// also the cold boot is needed in case we have flash drive
	// connected before Vold launched
	coldboot("/sys/block");

	ATRACE_END();

	android::IPCThreadState::self()->joinThreadPool();
	LOG(INFO) << "vold shutting down";

	exit(0);
	}

	static void parse_args(int argc, char** argv) {
	static struct option opts[] = {
	{"blkid_context", required_argument, 0, 'b'},
	{"blkid_untrusted_context", required_argument, 0, 'B'},
	{"fsck_context", required_argument, 0, 'f'},
	{"fsck_untrusted_context", required_argument, 0, 'F'},
	{nullptr, 0, nullptr, 0},
	};

	int c;
	while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
	switch (c) {
	// clang-format off
	case 'b': android::vold::sBlkidContext = optarg; break;
	case 'B': android::vold::sBlkidUntrustedContext = optarg; break;
	case 'f': android::vold::sFsckContext = optarg; break;
	case 'F': android::vold::sFsckUntrustedContext = optarg; break;
	// clang-format on
	}
	}

	CHECK(android::vold::sBlkidContext != nullptr);
	CHECK(android::vold::sBlkidUntrustedContext != nullptr);
	CHECK(android::vold::sFsckContext != nullptr);
	CHECK(android::vold::sFsckUntrustedContext != nullptr);
	}

	static void do_coldboot(DIR* d, int lvl) {
	struct dirent* de;
	int dfd, fd;

	dfd = dirfd(d);

	fd = openat(dfd, "uevent", O_WRONLY \| O_CLOEXEC);
	if (fd >= 0) {
	write(fd, "add\n", 4);
	close(fd);
	}

	while ((de = readdir(d))) {
	DIR* d2;

	if (de->d_name[0] == '.') continue;

	if (de->d_type != DT_DIR && lvl > 0) continue;

	fd = openat(dfd, de->d_name, O_RDONLY \| O_DIRECTORY \| O_CLOEXEC);
	if (fd < 0) continue;

	d2 = fdopendir(fd);
	if (d2 == 0)
	close(fd);
	else {
	do_coldboot(d2, lvl + 1);
	closedir(d2);
	}
	}
	}

	static void coldboot(const char* path) {
	ATRACE_NAME("coldboot");
	DIR* d = opendir(path);
	if (d) {
	do_coldboot(d, 0);
	closedir(d);
	}
	}

	static int process_config(VolumeManager* vm, VoldConfigs* configs) {
	ATRACE_NAME("process_config");

	if (!ReadDefaultFstab(&fstab_default)) {
	PLOG(ERROR) << "Failed to open default fstab";
	return -1;
	}

	/* Loop through entries looking for ones that vold manages */
	configs->has_adoptable = false;
	configs->has_quota = false;
	configs->has_reserved = false;
	configs->has_compress = false;
	for (auto& entry : fstab_default) {
	if (entry.fs_mgr_flags.quota) {
	configs->has_quota = true;
	}
	if (entry.reserved_size > 0) {
	configs->has_reserved = true;
	}
	if (entry.fs_mgr_flags.fs_compress) {
	configs->has_compress = true;
	}

	/* Make sure logical partitions have an updated blk_device. */
	if (entry.fs_mgr_flags.logical && !fs_mgr_update_logical_partition(&entry) &&
	!entry.fs_mgr_flags.no_fail) {
	PLOG(FATAL) << "could not find logical partition " << entry.blk_device;
	}

	if (entry.mount_point == "/data" && !entry.metadata_key_dir.empty()) {
	// Pre-populate userdata dm-devices since the uevents are asynchronous (b/198405417).
	android::vold::defaultkey_precreate_dm_device();
	}

	if (entry.fs_mgr_flags.vold_managed) {
	if (entry.fs_mgr_flags.nonremovable) {
	LOG(WARNING) << "nonremovable no longer supported; ignoring volume";
	continue;
	}

	std::string sysPattern(entry.blk_device);
	std::string nickname(entry.label);
	int flags = 0;

	if (entry.is_encryptable()) {
	flags \|= android::vold::Disk::Flags::kAdoptable;
	configs->has_adoptable = true;
	}
	if (entry.fs_mgr_flags.no_emulated_sd \|\|
	android::base::GetBoolProperty("vold.debug.default_primary", false)) {
	flags \|= android::vold::Disk::Flags::kDefaultPrimary;
	}

	vm->addDiskSource(std::shared_ptr<VolumeManager::DiskSource>(
	new VolumeManager::DiskSource(sysPattern, nickname, flags)));
	}
	}
	return 0;
	}

	static void VoldLogger(android::base::LogId log_buffer_id, android::base::LogSeverity severity,
	const char* tag, const char* file, unsigned int line, const char* message) {
	logd_logger(log_buffer_id, severity, tag, file, line, message);

	if (severity >= android::base::WARNING) {
	static bool early_boot_done = false;

	// If metadata encryption setup (fscrypt_mount_metadata_encrypted) or
	// basic FBE setup (fscrypt_init_user0) fails, then the boot will fail
	// before adb can be started, so logcat won't be available. To allow
	// debugging these early boot failures, log early errors and warnings to
	// the kernel log. This allows diagnosing failures via the serial log,
	// or via last dmesg/"fastboot oem dmesg" on devices that support it.
	//
	// As a very quick-and-dirty test for whether /data has been mounted,
	// check whether /data/misc/vold exists.
	if (!early_boot_done) {
	if (access("/data/misc/vold", F_OK) == 0 && fscrypt_init_user0_done) {
	early_boot_done = true;
	return;
	}
	android::base::KernelLogger(log_buffer_id, severity, tag, file, line, message);
	}
	}
	}