1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
* 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 <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <map>
#include <memory>
#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;
}
|
