volume_manager/Utils.cpp - LeafOS-Project/android_bootable_recovery - Gitiles

 /*
  * Copyright (C) 2015 The Android Open Source Project
  * Copyright (C) 2019 The LineageOS 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 "Utils.h"
 #include <volume_manager/VolumeManager.h>
 #include "Process.h"
 #include "sehandle.h"

 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>

 #include <cutils/fs.h>
 #include <private/android_filesystem_config.h>

 #include <dirent.h>
 #include <fcntl.h>
 #include <linux/fs.h>
 #include <stdlib.h>
 #include <sys/mount.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <mutex>
 #include <thread>

 #ifndef UMOUNT_NOFOLLOW
 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
 #endif

 using android::base::ReadFileToString;
 using android::base::StringPrintf;

 using namespace std::chrono_literals;

 namespace android {
 namespace volmgr {

 char* sBlkidContext = nullptr;
 char* sBlkidUntrustedContext = nullptr;
 char* sFsckContext = nullptr;
 char* sFsckUntrustedContext = nullptr;

 #include <blkid/blkid.h>

 static const char* kProcFilesystems = "/proc/filesystems";

 status_t CreateDeviceNode(const std::string& path, dev_t dev) {
     const char* cpath = path.c_str();
     status_t res = 0;

     char* secontext = nullptr;
     if (sehandle) {
         if (!selabel_lookup(sehandle, &secontext, cpath, S_IFBLK)) {
             setfscreatecon(secontext);
         }
     }

     mode_t mode = 0660 | S_IFBLK;
     if (mknod(cpath, mode, dev) < 0) {
         if (errno != EEXIST) {
             PLOG(ERROR) << "Failed to create device node for " << major(dev) << ":" << minor(dev)
                         << " at " << path;
             res = -errno;
         }
     }

     if (secontext) {
         setfscreatecon(nullptr);
         freecon(secontext);
     }

     return res;
 }

 status_t DestroyDeviceNode(const std::string& path) {
     const char* cpath = path.c_str();
     if (TEMP_FAILURE_RETRY(unlink(cpath))) {
         return -errno;
     } else {
         return OK;
     }
 }

 status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid) {
     const char* cpath = path.c_str();

     char* secontext = nullptr;
     if (sehandle) {
         if (!selabel_lookup(sehandle, &secontext, cpath, S_IFDIR)) {
             setfscreatecon(secontext);
         }
     }

     int res = fs_prepare_dir(cpath, mode, uid, gid);

     if (secontext) {
         setfscreatecon(nullptr);
         freecon(secontext);
     }

     if (res == 0) {
         return OK;
     } else {
         return -errno;
     }
 }

 status_t ForceUnmount(const std::string& path, bool detach /* = false */) {
     const char* cpath = path.c_str();
     if (detach) {
         if (!umount2(path.c_str(), UMOUNT_NOFOLLOW | MNT_DETACH) || errno == EINVAL ||
             errno == ENOENT) {
             return OK;
         }
         PLOG(WARNING) << "Failed to unmount " << path;
         return -errno;
     }
     if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
         return OK;
     }
     sleep(1);

     Process::killProcessesWithOpenFiles(cpath, SIGINT);
     sleep(1);
     if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
         return OK;
     }

     Process::killProcessesWithOpenFiles(cpath, SIGTERM);
     sleep(1);
     if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
         return OK;
     }

     Process::killProcessesWithOpenFiles(cpath, SIGKILL);
     sleep(1);
     if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
         return OK;
     }

     return -errno;
 }

 status_t KillProcessesUsingPath(const std::string& path) {
     const char* cpath = path.c_str();
     if (Process::killProcessesWithOpenFiles(cpath, SIGINT) == 0) {
         return OK;
     }
     sleep(1);

     if (Process::killProcessesWithOpenFiles(cpath, SIGTERM) == 0) {
         return OK;
     }
     sleep(1);

     if (Process::killProcessesWithOpenFiles(cpath, SIGKILL) == 0) {
         return OK;
     }
     sleep(1);

     // Send SIGKILL a second time to determine if we've
     // actually killed everyone with open files
     if (Process::killProcessesWithOpenFiles(cpath, SIGKILL) == 0) {
         return OK;
     }
     PLOG(ERROR) << "Failed to kill processes using " << path;
     return -EBUSY;
 }

 status_t BindMount(const std::string& source, const std::string& target) {
     if (::mount(source.c_str(), target.c_str(), "", MS_BIND, NULL)) {
         PLOG(WARNING) << "Failed to bind mount " << source << " to " << target;
         return -errno;
     }
     return OK;
 }

 static status_t readMetadata(const std::string& path, std::string& fsType, std::string& fsUuid,
                              std::string& fsLabel) {
     char* val = NULL;
     val = blkid_get_tag_value(NULL, "TYPE", path.c_str());
     if (val) {
         fsType = val;
     }
     val = blkid_get_tag_value(NULL, "UUID", path.c_str());
     if (val) {
         fsUuid = val;
     }
     val = blkid_get_tag_value(NULL, "LABEL", path.c_str());
     if (val) {
         fsLabel = val;
     }

     return OK;
 }

 status_t ReadMetadata(const std::string& path, std::string& fsType, std::string& fsUuid,
                       std::string& fsLabel) {
     return readMetadata(path, fsType, fsUuid, fsLabel);
 }

 status_t ReadMetadataUntrusted(const std::string& path, std::string& fsType, std::string& fsUuid,
                                std::string& fsLabel) {
     return readMetadata(path, fsType, fsUuid, fsLabel);
 }

 status_t ForkExecvp(const std::vector<std::string>& args) {
     return ForkExecvp(args, nullptr);
 }

 status_t ForkExecvp(const std::vector<std::string>& args, char* context) {
     std::vector<std::string> output;
     size_t argc = args.size();
     char** argv = (char**)calloc(argc + 1, sizeof(char*));
     for (size_t i = 0; i < argc; i++) {
         argv[i] = (char*)args[i].c_str();
         if (i == 0) {
             LOG(VERBOSE) << args[i];
         } else {
             LOG(VERBOSE) << "    " << args[i];
         }
     }

     if (setexeccon(context)) {
         LOG(ERROR) << "Failed to setexeccon";
         abort();
     }

     pid_t pid = fork();
     int fork_errno = errno;
     if (pid == 0) {
         close(STDIN_FILENO);
         close(STDOUT_FILENO);
         close(STDERR_FILENO);

         if (execvp(argv[0], argv)) {
             PLOG(ERROR) << "Failed to exec";
         }

         _exit(1);
     }

     if (setexeccon(nullptr)) {
         LOG(ERROR) << "Failed to setexeccon";
         abort();
     }

     if (pid == -1) {
         PLOG(ERROR) << "Failed to exec";
         return -fork_errno;
     }

     waitpid(pid, nullptr, 0);

     free(argv);
     return OK;
 }

 bool IsFilesystemSupported(const std::string& fsType) {
     std::string supported;
     if (!ReadFileToString(kProcFilesystems, &supported)) {
         PLOG(ERROR) << "Failed to read supported filesystems";
         return false;
     }

     /* fuse filesystems */
     supported.append("fuse\tntfs\n");

     return supported.find(fsType + "\n") != std::string::npos;
 }

 status_t WipeBlockDevice(const std::string& path) {
     status_t res = -1;
     const char* c_path = path.c_str();
     unsigned long nr_sec = 0;
     unsigned long long range[2];

     int fd = TEMP_FAILURE_RETRY(open(c_path, O_RDWR | O_CLOEXEC));
     if (fd == -1) {
         PLOG(ERROR) << "Failed to open " << path;
         goto done;
     }

     if ((ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
         PLOG(ERROR) << "Failed to determine size of " << path;
         goto done;
     }

     range[0] = 0;
     range[1] = (unsigned long long)nr_sec * 512;

     LOG(INFO) << "About to discard " << range[1] << " on " << path;
     if (ioctl(fd, BLKDISCARD, &range) == 0) {
         LOG(INFO) << "Discard success on " << path;
         res = 0;
     } else {
         PLOG(ERROR) << "Discard failure on " << path;
     }

 done:
     close(fd);
     return res;
 }

 dev_t GetDevice(const std::string& path) {
     struct stat sb;
     if (stat(path.c_str(), &sb)) {
         PLOG(WARNING) << "Failed to stat " << path;
         return 0;
     } else {
         return sb.st_dev;
     }
 }

 bool IsRunningInEmulator() {
     return android::base::GetBoolProperty("ro.kernel.qemu", false);
 }

 }  // namespace volmgr
 }  // namespace android
	/*
	* Copyright (C) 2015 The Android Open Source Project
	* Copyright (C) 2019 The LineageOS 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 "Utils.h"
	#include <volume_manager/VolumeManager.h>
	#include "Process.h"
	#include "sehandle.h"

	#include <android-base/file.h>
	#include <android-base/logging.h>
	#include <android-base/properties.h>
	#include <android-base/stringprintf.h>

	#include <cutils/fs.h>
	#include <private/android_filesystem_config.h>

	#include <dirent.h>
	#include <fcntl.h>
	#include <linux/fs.h>
	#include <stdlib.h>
	#include <sys/mount.h>
	#include <sys/stat.h>
	#include <sys/statvfs.h>
	#include <sys/sysmacros.h>
	#include <sys/types.h>
	#include <sys/wait.h>
	#include <mutex>
	#include <thread>

	#ifndef UMOUNT_NOFOLLOW
	#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
	#endif

	using android::base::ReadFileToString;
	using android::base::StringPrintf;

	using namespace std::chrono_literals;

	namespace android {
	namespace volmgr {

	char* sBlkidContext = nullptr;
	char* sBlkidUntrustedContext = nullptr;
	char* sFsckContext = nullptr;
	char* sFsckUntrustedContext = nullptr;

	#include <blkid/blkid.h>

	static const char* kProcFilesystems = "/proc/filesystems";

	status_t CreateDeviceNode(const std::string& path, dev_t dev) {
	const char* cpath = path.c_str();
	status_t res = 0;

	char* secontext = nullptr;
	if (sehandle) {
	if (!selabel_lookup(sehandle, &secontext, cpath, S_IFBLK)) {
	setfscreatecon(secontext);
	}
	}

	mode_t mode = 0660 \| S_IFBLK;
	if (mknod(cpath, mode, dev) < 0) {
	if (errno != EEXIST) {
	PLOG(ERROR) << "Failed to create device node for " << major(dev) << ":" << minor(dev)
	<< " at " << path;
	res = -errno;
	}
	}

	if (secontext) {
	setfscreatecon(nullptr);
	freecon(secontext);
	}

	return res;
	}

	status_t DestroyDeviceNode(const std::string& path) {
	const char* cpath = path.c_str();
	if (TEMP_FAILURE_RETRY(unlink(cpath))) {
	return -errno;
	} else {
	return OK;
	}
	}

	status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid) {
	const char* cpath = path.c_str();

	char* secontext = nullptr;
	if (sehandle) {
	if (!selabel_lookup(sehandle, &secontext, cpath, S_IFDIR)) {
	setfscreatecon(secontext);
	}
	}

	int res = fs_prepare_dir(cpath, mode, uid, gid);

	if (secontext) {
	setfscreatecon(nullptr);
	freecon(secontext);
	}

	if (res == 0) {
	return OK;
	} else {
	return -errno;
	}
	}

	status_t ForceUnmount(const std::string& path, bool detach /* = false */) {
	const char* cpath = path.c_str();
	if (detach) {
	if (!umount2(path.c_str(), UMOUNT_NOFOLLOW \| MNT_DETACH) \|\| errno == EINVAL \|\|
	errno == ENOENT) {
	return OK;
	}
	PLOG(WARNING) << "Failed to unmount " << path;
	return -errno;
	}
	if (!umount2(cpath, UMOUNT_NOFOLLOW) \|\| errno == EINVAL \|\| errno == ENOENT) {
	return OK;
	}
	sleep(1);

	Process::killProcessesWithOpenFiles(cpath, SIGINT);
	sleep(1);
	if (!umount2(cpath, UMOUNT_NOFOLLOW) \|\| errno == EINVAL \|\| errno == ENOENT) {
	return OK;
	}

	Process::killProcessesWithOpenFiles(cpath, SIGTERM);
	sleep(1);
	if (!umount2(cpath, UMOUNT_NOFOLLOW) \|\| errno == EINVAL \|\| errno == ENOENT) {
	return OK;
	}

	Process::killProcessesWithOpenFiles(cpath, SIGKILL);
	sleep(1);
	if (!umount2(cpath, UMOUNT_NOFOLLOW) \|\| errno == EINVAL \|\| errno == ENOENT) {
	return OK;
	}

	return -errno;
	}

	status_t KillProcessesUsingPath(const std::string& path) {
	const char* cpath = path.c_str();
	if (Process::killProcessesWithOpenFiles(cpath, SIGINT) == 0) {
	return OK;
	}
	sleep(1);

	if (Process::killProcessesWithOpenFiles(cpath, SIGTERM) == 0) {
	return OK;
	}
	sleep(1);

	if (Process::killProcessesWithOpenFiles(cpath, SIGKILL) == 0) {
	return OK;
	}
	sleep(1);

	// Send SIGKILL a second time to determine if we've
	// actually killed everyone with open files
	if (Process::killProcessesWithOpenFiles(cpath, SIGKILL) == 0) {
	return OK;
	}
	PLOG(ERROR) << "Failed to kill processes using " << path;
	return -EBUSY;
	}

	status_t BindMount(const std::string& source, const std::string& target) {
	if (::mount(source.c_str(), target.c_str(), "", MS_BIND, NULL)) {
	PLOG(WARNING) << "Failed to bind mount " << source << " to " << target;
	return -errno;
	}
	return OK;
	}

	static status_t readMetadata(const std::string& path, std::string& fsType, std::string& fsUuid,
	std::string& fsLabel) {
	char* val = NULL;
	val = blkid_get_tag_value(NULL, "TYPE", path.c_str());
	if (val) {
	fsType = val;
	}
	val = blkid_get_tag_value(NULL, "UUID", path.c_str());
	if (val) {
	fsUuid = val;
	}
	val = blkid_get_tag_value(NULL, "LABEL", path.c_str());
	if (val) {
	fsLabel = val;
	}

	return OK;
	}

	status_t ReadMetadata(const std::string& path, std::string& fsType, std::string& fsUuid,
	std::string& fsLabel) {
	return readMetadata(path, fsType, fsUuid, fsLabel);
	}

	status_t ReadMetadataUntrusted(const std::string& path, std::string& fsType, std::string& fsUuid,
	std::string& fsLabel) {
	return readMetadata(path, fsType, fsUuid, fsLabel);
	}

	status_t ForkExecvp(const std::vector<std::string>& args) {
	return ForkExecvp(args, nullptr);
	}

	status_t ForkExecvp(const std::vector<std::string>& args, char* context) {
	std::vector<std::string> output;
	size_t argc = args.size();
	char argv = (char)calloc(argc + 1, sizeof(char*));
	for (size_t i = 0; i < argc; i++) {
	argv[i] = (char*)args[i].c_str();
	if (i == 0) {
	LOG(VERBOSE) << args[i];
	} else {
	LOG(VERBOSE) << " " << args[i];
	}
	}

	if (setexeccon(context)) {
	LOG(ERROR) << "Failed to setexeccon";
	abort();
	}

	pid_t pid = fork();
	int fork_errno = errno;
	if (pid == 0) {
	close(STDIN_FILENO);
	close(STDOUT_FILENO);
	close(STDERR_FILENO);

	if (execvp(argv[0], argv)) {
	PLOG(ERROR) << "Failed to exec";
	}

	_exit(1);
	}

	if (setexeccon(nullptr)) {
	LOG(ERROR) << "Failed to setexeccon";
	abort();
	}

	if (pid == -1) {
	PLOG(ERROR) << "Failed to exec";
	return -fork_errno;
	}

	waitpid(pid, nullptr, 0);

	free(argv);
	return OK;
	}

	bool IsFilesystemSupported(const std::string& fsType) {
	std::string supported;
	if (!ReadFileToString(kProcFilesystems, &supported)) {
	PLOG(ERROR) << "Failed to read supported filesystems";
	return false;
	}

	/* fuse filesystems */
	supported.append("fuse\tntfs\n");

	return supported.find(fsType + "\n") != std::string::npos;
	}

	status_t WipeBlockDevice(const std::string& path) {
	status_t res = -1;
	const char* c_path = path.c_str();
	unsigned long nr_sec = 0;
	unsigned long long range[2];

	int fd = TEMP_FAILURE_RETRY(open(c_path, O_RDWR \| O_CLOEXEC));
	if (fd == -1) {
	PLOG(ERROR) << "Failed to open " << path;
	goto done;
	}

	if ((ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
	PLOG(ERROR) << "Failed to determine size of " << path;
	goto done;
	}

	range[0] = 0;
	range[1] = (unsigned long long)nr_sec * 512;

	LOG(INFO) << "About to discard " << range[1] << " on " << path;
	if (ioctl(fd, BLKDISCARD, &range) == 0) {
	LOG(INFO) << "Discard success on " << path;
	res = 0;
	} else {
	PLOG(ERROR) << "Discard failure on " << path;
	}

	done:
	close(fd);
	return res;
	}

	dev_t GetDevice(const std::string& path) {
	struct stat sb;
	if (stat(path.c_str(), &sb)) {
	PLOG(WARNING) << "Failed to stat " << path;
	return 0;
	} else {
	return sb.st_dev;
	}
	}

	bool IsRunningInEmulator() {
	return android::base::GetBoolProperty("ro.kernel.qemu", false);
	}

	} // namespace volmgr
	} // namespace android