main.cpp - platform/system/vold - Gitiles

 /*
  * 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.
  */

 #include "Disk.h"
 #include "VolumeManager.h"
 #include "CommandListener.h"
 #include "CryptCommandListener.h"
 #include "NetlinkManager.h"
 #include "cryptfs.h"
 #include "sehandle.h"

 #include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 #include <cutils/klog.h>
 #include <cutils/properties.h>
 #include <cutils/sockets.h>

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

 static int process_config(VolumeManager *vm, bool* has_adoptable);
 static void coldboot(const char *path);
 static void parse_args(int argc, char** argv);

 struct fstab *fstab;

 struct selabel_handle *sehandle;

 using android::base::StringPrintf;

 int main(int argc, char** argv) {
     setenv("ANDROID_LOG_TAGS", "*:v", 1);
     android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));

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

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

     VolumeManager *vm;
     CommandListener *cl;
     CryptCommandListener *ccl;
     NetlinkManager *nm;

     parse_args(argc, argv);

     sehandle = selinux_android_file_context_handle();
     if (sehandle) {
         selinux_android_set_sehandle(sehandle);
     }

     // Quickly throw a CLOEXEC on the socket we just inherited from init
     fcntl(android_get_control_socket("vold"), F_SETFD, FD_CLOEXEC);
     fcntl(android_get_control_socket("cryptd"), F_SETFD, FD_CLOEXEC);

     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 (property_get_bool("vold.debug", false)) {
         vm->setDebug(true);
     }

     cl = new CommandListener();
     ccl = new CryptCommandListener();
     vm->setBroadcaster((SocketListener *) cl);
     nm->setBroadcaster((SocketListener *) cl);

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

     bool has_adoptable;

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

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

     /*
      * Now that we're up, we can respond to commands
      */
     if (cl->startListener()) {
         PLOG(ERROR) << "Unable to start CommandListener";
         exit(1);
     }

     if (ccl->startListener()) {
         PLOG(ERROR) << "Unable to start CryptCommandListener";
         exit(1);
     }

     // This call should go after listeners are started to avoid
     // a deadlock between vold and init (see b/34278978 for details)
     property_set("vold.has_adoptable", has_adoptable ? "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");
     // Eventually we'll become the monitoring thread
     while(1) {
         pause();
     }

     LOG(ERROR) << "Vold exiting";
     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' },
     };

     int c;
     while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
         switch (c) {
         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;
         }
     }

     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) {
     DIR *d = opendir(path);
     if(d) {
         do_coldboot(d, 0);
         closedir(d);
     }
 }

 static int process_config(VolumeManager *vm, bool* has_adoptable) {
     fstab = fs_mgr_read_fstab_default();
     if (!fstab) {
         PLOG(ERROR) << "Failed to open default fstab";
         return -1;
     }

     /* Loop through entries looking for ones that vold manages */
     *has_adoptable = false;
     for (int i = 0; i < fstab->num_entries; i++) {
         if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
             if (fs_mgr_is_nonremovable(&fstab->recs[i])) {
                 LOG(WARNING) << "nonremovable no longer supported; ignoring volume";
                 continue;
             }

             std::string sysPattern(fstab->recs[i].blk_device);
             std::string nickname(fstab->recs[i].label);
             int flags = 0;

             if (fs_mgr_is_encryptable(&fstab->recs[i])) {
                 flags |= android::vold::Disk::Flags::kAdoptable;
                 *has_adoptable = true;
             }
             if (fs_mgr_is_noemulatedsd(&fstab->recs[i])
                     || property_get_bool("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;
 }
	/*
	* 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.
	*/

	#include "Disk.h"
	#include "VolumeManager.h"
	#include "CommandListener.h"
	#include "CryptCommandListener.h"
	#include "NetlinkManager.h"
	#include "cryptfs.h"
	#include "sehandle.h"

	#include <android-base/logging.h>
	#include <android-base/stringprintf.h>
	#include <cutils/klog.h>
	#include <cutils/properties.h>
	#include <cutils/sockets.h>

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

	static int process_config(VolumeManager vm, bool has_adoptable);
	static void coldboot(const char *path);
	static void parse_args(int argc, char** argv);

	struct fstab *fstab;

	struct selabel_handle *sehandle;

	using android::base::StringPrintf;

	int main(int argc, char** argv) {
	setenv("ANDROID_LOG_TAGS", "*:v", 1);
	android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));

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

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

	VolumeManager *vm;
	CommandListener *cl;
	CryptCommandListener *ccl;
	NetlinkManager *nm;

	parse_args(argc, argv);

	sehandle = selinux_android_file_context_handle();
	if (sehandle) {
	selinux_android_set_sehandle(sehandle);
	}

	// Quickly throw a CLOEXEC on the socket we just inherited from init
	fcntl(android_get_control_socket("vold"), F_SETFD, FD_CLOEXEC);
	fcntl(android_get_control_socket("cryptd"), F_SETFD, FD_CLOEXEC);

	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 (property_get_bool("vold.debug", false)) {
	vm->setDebug(true);
	}

	cl = new CommandListener();
	ccl = new CryptCommandListener();
	vm->setBroadcaster((SocketListener *) cl);
	nm->setBroadcaster((SocketListener *) cl);

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

	bool has_adoptable;

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

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

	/*
	* Now that we're up, we can respond to commands
	*/
	if (cl->startListener()) {
	PLOG(ERROR) << "Unable to start CommandListener";
	exit(1);
	}

	if (ccl->startListener()) {
	PLOG(ERROR) << "Unable to start CryptCommandListener";
	exit(1);
	}

	// This call should go after listeners are started to avoid
	// a deadlock between vold and init (see b/34278978 for details)
	property_set("vold.has_adoptable", has_adoptable ? "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");
	// Eventually we'll become the monitoring thread
	while(1) {
	pause();
	}

	LOG(ERROR) << "Vold exiting";
	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' },
	};

	int c;
	while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) {
	switch (c) {
	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;
	}
	}

	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) {
	DIR *d = opendir(path);
	if(d) {
	do_coldboot(d, 0);
	closedir(d);
	}
	}

	static int process_config(VolumeManager vm, bool has_adoptable) {
	fstab = fs_mgr_read_fstab_default();
	if (!fstab) {
	PLOG(ERROR) << "Failed to open default fstab";
	return -1;
	}

	/* Loop through entries looking for ones that vold manages */
	*has_adoptable = false;
	for (int i = 0; i < fstab->num_entries; i++) {
	if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
	if (fs_mgr_is_nonremovable(&fstab->recs[i])) {
	LOG(WARNING) << "nonremovable no longer supported; ignoring volume";
	continue;
	}

	std::string sysPattern(fstab->recs[i].blk_device);
	std::string nickname(fstab->recs[i].label);
	int flags = 0;

	if (fs_mgr_is_encryptable(&fstab->recs[i])) {
	flags \|= android::vold::Disk::Flags::kAdoptable;
	*has_adoptable = true;
	}
	if (fs_mgr_is_noemulatedsd(&fstab->recs[i])
	\|\| property_get_bool("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;
	}