/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "avb_ops_user.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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//#include <cutils/properties.h>
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//#include <fs_mgr.h>
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#include <libavb_ab/libavb_ab.h>
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#define MISC_PARTITION "/dev/block/by-name/misc"
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static int open_partition(const char* name, int flags) {
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int fd = open(MISC_PARTITION, flags);
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return fd;
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}
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static AvbIOResult read_from_partition(AvbOps* ops,
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const char* partition,
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int64_t offset,
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size_t num_bytes,
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void* buffer,
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size_t* out_num_read) {
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int fd;
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off_t where;
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ssize_t num_read;
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AvbIOResult ret;
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fd = open_partition(partition, O_RDONLY);
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if (fd == -1) {
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ret = AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION;
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goto out;
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}
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if (offset < 0) {
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uint64_t partition_size;
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if (ioctl(fd, BLKGETSIZE64, &partition_size) != 0) {
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avb_errorv(
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"Error getting size of \"", partition, "\" partition.\n", NULL);
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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offset = partition_size - (-offset);
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}
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where = lseek(fd, offset, SEEK_SET);
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if (where == -1) {
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avb_error("Error seeking to offset.\n");
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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if (where != offset) {
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avb_error("Error seeking to offset.\n");
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ret = AVB_IO_RESULT_ERROR_RANGE_OUTSIDE_PARTITION;
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goto out;
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}
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/* On Linux, we never get partial reads from block devices (except
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* for EOF).
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*/
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num_read = read(fd, buffer, num_bytes);
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if (num_read == -1) {
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avb_error("Error reading data.\n");
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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if (out_num_read != NULL) {
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*out_num_read = num_read;
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}
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ret = AVB_IO_RESULT_OK;
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out:
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if (fd != -1) {
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if (close(fd) != 0) {
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avb_error("Error closing file descriptor.\n");
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}
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}
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return ret;
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}
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static AvbIOResult write_to_partition(AvbOps* ops,
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const char* partition,
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int64_t offset,
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size_t num_bytes,
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const void* buffer) {
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int fd;
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off_t where;
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ssize_t num_written;
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AvbIOResult ret;
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fd = open_partition(partition, O_WRONLY);
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if (fd == -1) {
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avb_errorv("Error opening \"", partition, "\" partition.\n", NULL);
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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where = lseek(fd, offset, SEEK_SET);
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if (where == -1) {
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avb_error("Error seeking to offset.\n");
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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if (where != offset) {
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avb_error("Error seeking to offset.\n");
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ret = AVB_IO_RESULT_ERROR_RANGE_OUTSIDE_PARTITION;
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goto out;
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}
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/* On Linux, we never get partial writes on block devices. */
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num_written = write(fd, buffer, num_bytes);
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if (num_written == -1) {
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avb_error("Error writing data.\n");
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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ret = AVB_IO_RESULT_OK;
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out:
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if (fd != -1) {
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if (close(fd) != 0) {
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avb_error("Error closing file descriptor.\n");
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}
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}
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return ret;
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}
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static AvbIOResult validate_vbmeta_public_key(
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AvbOps* ops,
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const uint8_t* public_key_data,
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size_t public_key_length,
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const uint8_t* public_key_metadata,
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size_t public_key_metadata_length,
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bool* out_is_trusted) {
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if (out_is_trusted != NULL) {
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*out_is_trusted = true;
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}
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return AVB_IO_RESULT_OK;
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}
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static AvbIOResult read_rollback_index(AvbOps* ops,
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size_t rollback_index_location,
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uint64_t* out_rollback_index) {
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if (out_rollback_index != NULL) {
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*out_rollback_index = 0;
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}
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return AVB_IO_RESULT_OK;
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}
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static AvbIOResult write_rollback_index(AvbOps* ops,
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size_t rollback_index_location,
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uint64_t rollback_index) {
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return AVB_IO_RESULT_OK;
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}
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static AvbIOResult read_is_device_unlocked(AvbOps* ops, bool* out_is_unlocked) {
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if (out_is_unlocked != NULL) {
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*out_is_unlocked = true;
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}
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return AVB_IO_RESULT_OK;
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}
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static AvbIOResult get_size_of_partition(AvbOps* ops,
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const char* partition,
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uint64_t* out_size_in_bytes) {
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int fd;
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AvbIOResult ret;
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fd = open_partition(partition, O_WRONLY);
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if (fd == -1) {
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avb_errorv("Error opening \"", partition, "\" partition.\n", NULL);
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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if (out_size_in_bytes != NULL) {
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if (ioctl(fd, BLKGETSIZE64, out_size_in_bytes) != 0) {
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avb_errorv(
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"Error getting size of \"", partition, "\" partition.\n", NULL);
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ret = AVB_IO_RESULT_ERROR_IO;
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goto out;
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}
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}
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ret = AVB_IO_RESULT_OK;
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out:
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if (fd != -1) {
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if (close(fd) != 0) {
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avb_error("Error closing file descriptor.\n");
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}
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}
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return ret;
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}
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static AvbIOResult get_unique_guid_for_partition(AvbOps* ops,
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const char* partition,
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char* guid_buf,
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size_t guid_buf_size) {
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if (guid_buf != NULL && guid_buf_size > 0) {
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guid_buf[0] = '\0';
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}
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return AVB_IO_RESULT_OK;
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}
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AvbOps* avb_ops_user_new(void) {
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AvbOps* ops;
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ops = static_cast<AvbOps*>(calloc(1, sizeof(AvbOps)));
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if (ops == NULL) {
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avb_error("Error allocating memory for AvbOps.\n");
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goto out;
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}
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ops->ab_ops = static_cast<AvbABOps*>(calloc(1, sizeof(AvbABOps)));
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if (ops->ab_ops == NULL) {
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avb_error("Error allocating memory for AvbABOps.\n");
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free(ops);
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goto out;
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}
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ops->ab_ops->ops = ops;
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ops->read_from_partition = read_from_partition;
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ops->write_to_partition = write_to_partition;
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ops->validate_vbmeta_public_key = validate_vbmeta_public_key;
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ops->read_rollback_index = read_rollback_index;
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ops->write_rollback_index = write_rollback_index;
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ops->read_is_device_unlocked = read_is_device_unlocked;
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ops->get_unique_guid_for_partition = get_unique_guid_for_partition;
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ops->get_size_of_partition = get_size_of_partition;
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ops->ab_ops->read_ab_metadata = avb_ab_data_read;
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ops->ab_ops->write_ab_metadata = avb_ab_data_write;
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out:
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return ops;
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}
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void avb_ops_user_free(AvbOps* ops) {
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free(ops->ab_ops);
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free(ops);
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}
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