/*
* Copyright (C) 2015 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 "ota_io.h"
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <map>
#include <mutex>
#include <android-base/thread_annotations.h>
#include "config.h"
static std::mutex filename_mutex;
static std::map<intptr_t, const char*> filename_cache GUARDED_BY(filename_mutex);
static std::string read_fault_file_name = "";
static std::string write_fault_file_name = "";
static std::string fsync_fault_file_name = "";
static bool get_hit_file(const char* cached_path, const std::string& ffn) {
return should_hit_cache()
? !strncmp(cached_path, OTAIO_CACHE_FNAME, strlen(cached_path))
: !strncmp(cached_path, ffn.c_str(), strlen(cached_path));
}
void ota_set_fault_files() {
if (should_fault_inject(OTAIO_READ)) {
read_fault_file_name = fault_fname(OTAIO_READ);
}
if (should_fault_inject(OTAIO_WRITE)) {
write_fault_file_name = fault_fname(OTAIO_WRITE);
}
if (should_fault_inject(OTAIO_FSYNC)) {
fsync_fault_file_name = fault_fname(OTAIO_FSYNC);
}
}
bool have_eio_error = false;
int ota_open(const char* path, int oflags) {
// Let the caller handle errors; we do not care if open succeeds or fails
int fd = open(path, oflags);
std::lock_guard<std::mutex> lock(filename_mutex);
filename_cache[fd] = path;
return fd;
}
int ota_open(const char* path, int oflags, mode_t mode) {
int fd = open(path, oflags, mode);
std::lock_guard<std::mutex> lock(filename_mutex);
filename_cache[fd] = path;
return fd;
}
FILE* ota_fopen(const char* path, const char* mode) {
FILE* fh = fopen(path, mode);
std::lock_guard<std::mutex> lock(filename_mutex);
filename_cache[(intptr_t)fh] = path;
return fh;
}
static int __ota_close(int fd) {
// descriptors can be reused, so make sure not to leave them in the cache
std::lock_guard<std::mutex> lock(filename_mutex);
filename_cache.erase(fd);
return close(fd);
}
void OtaCloser::Close(int fd) {
__ota_close(fd);
}
int ota_close(unique_fd& fd) {
return __ota_close(fd.release());
}
static int __ota_fclose(FILE* fh) {
std::lock_guard<std::mutex> lock(filename_mutex);
filename_cache.erase(reinterpret_cast<intptr_t>(fh));
return fclose(fh);
}
void OtaFcloser::operator()(FILE* f) const {
__ota_fclose(f);
};
int ota_fclose(unique_file& fh) {
return __ota_fclose(fh.release());
}
size_t ota_fread(void* ptr, size_t size, size_t nitems, FILE* stream) {
if (should_fault_inject(OTAIO_READ)) {
std::lock_guard<std::mutex> lock(filename_mutex);
auto cached = filename_cache.find((intptr_t)stream);
const char* cached_path = cached->second;
if (cached != filename_cache.end() &&
get_hit_file(cached_path, read_fault_file_name)) {
read_fault_file_name = "";
errno = EIO;
have_eio_error = true;
return 0;
}
}
size_t status = fread(ptr, size, nitems, stream);
// If I/O error occurs, set the retry-update flag.
if (status != nitems && errno == EIO) {
have_eio_error = true;
}
return status;
}
ssize_t ota_read(int fd, void* buf, size_t nbyte) {
if (should_fault_inject(OTAIO_READ)) {
std::lock_guard<std::mutex> lock(filename_mutex);
auto cached = filename_cache.find(fd);
const char* cached_path = cached->second;
if (cached != filename_cache.end()
&& get_hit_file(cached_path, read_fault_file_name)) {
read_fault_file_name = "";
errno = EIO;
have_eio_error = true;
return -1;
}
}
ssize_t status = read(fd, buf, nbyte);
if (status == -1 && errno == EIO) {
have_eio_error = true;
}
return status;
}
size_t ota_fwrite(const void* ptr, size_t size, size_t count, FILE* stream) {
if (should_fault_inject(OTAIO_WRITE)) {
std::lock_guard<std::mutex> lock(filename_mutex);
auto cached = filename_cache.find((intptr_t)stream);
const char* cached_path = cached->second;
if (cached != filename_cache.end() &&
get_hit_file(cached_path, write_fault_file_name)) {
write_fault_file_name = "";
errno = EIO;
have_eio_error = true;
return 0;
}
}
size_t status = fwrite(ptr, size, count, stream);
if (status != count && errno == EIO) {
have_eio_error = true;
}
return status;
}
ssize_t ota_write(int fd, const void* buf, size_t nbyte) {
if (should_fault_inject(OTAIO_WRITE)) {
std::lock_guard<std::mutex> lock(filename_mutex);
auto cached = filename_cache.find(fd);
const char* cached_path = cached->second;
if (cached != filename_cache.end() &&
get_hit_file(cached_path, write_fault_file_name)) {
write_fault_file_name = "";
errno = EIO;
have_eio_error = true;
return -1;
}
}
ssize_t status = write(fd, buf, nbyte);
if (status == -1 && errno == EIO) {
have_eio_error = true;
}
return status;
}
int ota_fsync(int fd) {
if (should_fault_inject(OTAIO_FSYNC)) {
std::lock_guard<std::mutex> lock(filename_mutex);
auto cached = filename_cache.find(fd);
const char* cached_path = cached->second;
if (cached != filename_cache.end() &&
get_hit_file(cached_path, fsync_fault_file_name)) {
fsync_fault_file_name = "";
errno = EIO;
have_eio_error = true;
return -1;
}
}
int status = fsync(fd);
if (status == -1 && errno == EIO) {
have_eio_error = true;
}
return status;
}
