diff options
Diffstat (limited to 'uncrypt')
| -rw-r--r-- | uncrypt/Android.mk | 11 | ||||
| -rw-r--r-- | uncrypt/bootloader_message_writer.cpp | 123 | ||||
| -rw-r--r-- | uncrypt/include/bootloader_message_writer.h | 36 | ||||
| -rw-r--r-- | uncrypt/uncrypt.cpp | 2 |
4 files changed, 170 insertions, 2 deletions
diff --git a/uncrypt/Android.mk b/uncrypt/Android.mk index bb276edd5..09cfdfca5 100644 --- a/uncrypt/Android.mk +++ b/uncrypt/Android.mk @@ -15,6 +15,15 @@ LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) +LOCAL_CLANG := true +LOCAL_SRC_FILES := bootloader_message_writer.cpp +LOCAL_MODULE := libbootloader_message_writer +LOCAL_STATIC_LIBRARIES := libbase libfs_mgr +LOCAL_C_INCLUDES := $(LOCAL_PATH)/.. +LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include +include $(BUILD_STATIC_LIBRARY) + +include $(CLEAR_VARS) LOCAL_CLANG := true @@ -24,7 +33,7 @@ LOCAL_C_INCLUDES := $(LOCAL_PATH)/.. LOCAL_MODULE := uncrypt -LOCAL_STATIC_LIBRARIES := libbootloader_message libbase \ +LOCAL_STATIC_LIBRARIES := libbootloader_message_writer libbase \ liblog libfs_mgr libcutils \ LOCAL_INIT_RC := uncrypt.rc diff --git a/uncrypt/bootloader_message_writer.cpp b/uncrypt/bootloader_message_writer.cpp new file mode 100644 index 000000000..42df31efa --- /dev/null +++ b/uncrypt/bootloader_message_writer.cpp @@ -0,0 +1,123 @@ +/* + * Copyright (C) 2016 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <errno.h> +#include <fcntl.h> +#include <string.h> +#include <sys/system_properties.h> + +#include <string> +#include <vector> + +#include <android-base/file.h> +#include <android-base/stringprintf.h> +#include <android-base/unique_fd.h> +#include <fs_mgr.h> + +#include "bootloader.h" + +static struct fstab* read_fstab(std::string* err) { + // The fstab path is always "/fstab.${ro.hardware}". + std::string fstab_path = "/fstab."; + char value[PROP_VALUE_MAX]; + if (__system_property_get("ro.hardware", value) == 0) { + *err = "failed to get ro.hardware"; + return nullptr; + } + fstab_path += value; + struct fstab* fstab = fs_mgr_read_fstab(fstab_path.c_str()); + if (fstab == nullptr) { + *err = "failed to read " + fstab_path; + } + return fstab; +} + +static std::string get_misc_blk_device(std::string* err) { + struct fstab* fstab = read_fstab(err); + if (fstab == nullptr) { + return ""; + } + fstab_rec* record = fs_mgr_get_entry_for_mount_point(fstab, "/misc"); + if (record == nullptr) { + *err = "failed to find /misc partition"; + return ""; + } + return record->blk_device; +} + +static bool write_misc_partition(const void* p, size_t size, size_t misc_offset, std::string* err) { + std::string misc_blk_device = get_misc_blk_device(err); + if (misc_blk_device.empty()) { + return false; + } + android::base::unique_fd fd(open(misc_blk_device.c_str(), O_WRONLY | O_SYNC)); + if (fd.get() == -1) { + *err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(), + strerror(errno)); + return false; + } + if (lseek(fd.get(), static_cast<off_t>(misc_offset), SEEK_SET) != + static_cast<off_t>(misc_offset)) { + *err = android::base::StringPrintf("failed to lseek %s: %s", misc_blk_device.c_str(), + strerror(errno)); + return false; + } + if (!android::base::WriteFully(fd.get(), p, size)) { + *err = android::base::StringPrintf("failed to write %s: %s", misc_blk_device.c_str(), + strerror(errno)); + return false; + } + + // TODO: O_SYNC and fsync duplicates each other? + if (fsync(fd.get()) == -1) { + *err = android::base::StringPrintf("failed to fsync %s: %s", misc_blk_device.c_str(), + strerror(errno)); + return false; + } + return true; +} + +static bool write_bootloader_message(const bootloader_message& boot, std::string* err) { + return write_misc_partition(&boot, sizeof(boot), BOOTLOADER_MESSAGE_OFFSET_IN_MISC, err); +} + +bool clear_bootloader_message(std::string* err) { + bootloader_message boot = {}; + return write_bootloader_message(boot, err); +} + +bool write_bootloader_message(const std::vector<std::string>& options, std::string* err) { + bootloader_message boot = {}; + strlcpy(boot.command, "boot-recovery", sizeof(boot.command)); + strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery)); + for (const auto& s : options) { + strlcat(boot.recovery, s.c_str(), sizeof(boot.recovery)); + if (s.back() != '\n') { + strlcat(boot.recovery, "\n", sizeof(boot.recovery)); + } + } + return write_bootloader_message(boot, err); +} + +bool write_wipe_package(const std::string& package_data, std::string* err) { + return write_misc_partition(package_data.data(), package_data.size(), + WIPE_PACKAGE_OFFSET_IN_MISC, err); +} + +extern "C" bool write_bootloader_message(const char* options) { + std::string err; + return write_bootloader_message({options}, &err); +} diff --git a/uncrypt/include/bootloader_message_writer.h b/uncrypt/include/bootloader_message_writer.h new file mode 100644 index 000000000..1344bc835 --- /dev/null +++ b/uncrypt/include/bootloader_message_writer.h @@ -0,0 +1,36 @@ +/* + * Copyright (C) 2016 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. + */ + +#ifndef BOOTLOADER_MESSAGE_WRITER_H +#define BOOTLOADER_MESSAGE_WRITER_H + +#ifdef __cplusplus +#include <string> +#include <vector> + +bool clear_bootloader_message(std::string* err); + +bool write_bootloader_message(const std::vector<std::string>& options, std::string* err); +bool write_wipe_package(const std::string& package_data, std::string* err); + +#else +#include <stdbool.h> + +// C Interface. +bool write_bootloader_message(const char* options); +#endif + +#endif // BOOTLOADER_MESSAGE_WRITER_H diff --git a/uncrypt/uncrypt.cpp b/uncrypt/uncrypt.cpp index 5e804bcca..f62d13279 100644 --- a/uncrypt/uncrypt.cpp +++ b/uncrypt/uncrypt.cpp @@ -109,7 +109,7 @@ #include <android-base/logging.h> #include <android-base/stringprintf.h> #include <android-base/strings.h> -#include <bootloader_message/bootloader_message.h> +#include <bootloader_message_writer.h> #include <cutils/android_reboot.h> #include <cutils/properties.h> #include <cutils/sockets.h> |