blob: 484f1150f9597eebe4394955d30d99bc51278981 [file] [log] [blame]
Jerry Zhang152933a2018-05-02 16:56:00 -07001/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
xunchang316e9712019-04-12 16:22:15 -070017#include "otautil/logging.h"
Jerry Zhang152933a2018-05-02 16:56:00 -070018
xunchang2239b9e2019-04-15 15:24:24 -070019#include <dirent.h>
20#include <errno.h>
Jerry Zhang152933a2018-05-02 16:56:00 -070021#include <stdio.h>
22#include <string.h>
23#include <sys/klog.h>
24#include <sys/types.h>
25
xunchang2239b9e2019-04-15 15:24:24 -070026#include <algorithm>
27#include <memory>
Jerry Zhang152933a2018-05-02 16:56:00 -070028#include <string>
29
30#include <android-base/file.h>
31#include <android-base/logging.h>
32#include <android-base/parseint.h>
33#include <android-base/stringprintf.h>
xunchang2239b9e2019-04-15 15:24:24 -070034#include <android-base/unique_fd.h>
Jerry Zhang152933a2018-05-02 16:56:00 -070035#include <private/android_filesystem_config.h> /* for AID_SYSTEM */
36#include <private/android_logger.h> /* private pmsg functions */
xunchang316e9712019-04-12 16:22:15 -070037#include <selinux/label.h>
Jerry Zhang152933a2018-05-02 16:56:00 -070038
Jerry Zhang152933a2018-05-02 16:56:00 -070039#include "otautil/dirutil.h"
40#include "otautil/paths.h"
xunchang24788852019-03-22 16:08:52 -070041#include "otautil/roots.h"
Jerry Zhang152933a2018-05-02 16:56:00 -070042
xunchang2239b9e2019-04-15 15:24:24 -070043constexpr const char* LOG_FILE = "/cache/recovery/log";
44constexpr const char* LAST_INSTALL_FILE = "/cache/recovery/last_install";
45constexpr const char* LAST_KMSG_FILE = "/cache/recovery/last_kmsg";
46constexpr const char* LAST_LOG_FILE = "/cache/recovery/last_log";
Jerry Zhang152933a2018-05-02 16:56:00 -070047
xunchang2239b9e2019-04-15 15:24:24 -070048constexpr const char* LAST_KMSG_FILTER = "recovery/last_kmsg";
49constexpr const char* LAST_LOG_FILTER = "recovery/last_log";
50
51constexpr const char* CACHE_LOG_DIR = "/cache/recovery";
52
53static struct selabel_handle* logging_sehandle;
54
55void SetLoggingSehandle(selabel_handle* handle) {
56 logging_sehandle = handle;
57}
Jerry Zhang152933a2018-05-02 16:56:00 -070058
59// fopen(3)'s the given file, by mounting volumes and making parent dirs as necessary. Returns the
60// file pointer, or nullptr on error.
xunchang316e9712019-04-12 16:22:15 -070061static FILE* fopen_path(const std::string& path, const char* mode, const selabel_handle* sehandle) {
Yifan Hongd81b8e32018-12-17 14:29:06 -080062 if (ensure_path_mounted(path) != 0) {
Jerry Zhang152933a2018-05-02 16:56:00 -070063 LOG(ERROR) << "Can't mount " << path;
64 return nullptr;
65 }
66
67 // When writing, try to create the containing directory, if necessary. Use generous permissions,
68 // the system (init.rc) will reset them.
69 if (strchr("wa", mode[0])) {
70 mkdir_recursively(path, 0777, true, sehandle);
71 }
72 return fopen(path.c_str(), mode);
73}
74
75void check_and_fclose(FILE* fp, const std::string& name) {
76 fflush(fp);
77 if (fsync(fileno(fp)) == -1) {
78 PLOG(ERROR) << "Failed to fsync " << name;
79 }
80 if (ferror(fp)) {
81 PLOG(ERROR) << "Error in " << name;
82 }
83 fclose(fp);
84}
85
86// close a file, log an error if the error indicator is set
87ssize_t logbasename(log_id_t /* id */, char /* prio */, const char* filename, const char* /* buf */,
88 size_t len, void* arg) {
89 bool* do_rotate = static_cast<bool*>(arg);
xunchang2239b9e2019-04-15 15:24:24 -070090 if (std::string(LAST_KMSG_FILTER).find(filename) != std::string::npos ||
91 std::string(LAST_LOG_FILTER).find(filename) != std::string::npos) {
Jerry Zhang152933a2018-05-02 16:56:00 -070092 *do_rotate = true;
93 }
94 return len;
95}
96
97ssize_t logrotate(log_id_t id, char prio, const char* filename, const char* buf, size_t len,
98 void* arg) {
99 bool* do_rotate = static_cast<bool*>(arg);
100 if (!*do_rotate) {
101 return __android_log_pmsg_file_write(id, prio, filename, buf, len);
102 }
103
104 std::string name(filename);
105 size_t dot = name.find_last_of('.');
106 std::string sub = name.substr(0, dot);
107
xunchang2239b9e2019-04-15 15:24:24 -0700108 if (std::string(LAST_KMSG_FILTER).find(sub) == std::string::npos &&
109 std::string(LAST_LOG_FILTER).find(sub) == std::string::npos) {
Jerry Zhang152933a2018-05-02 16:56:00 -0700110 return __android_log_pmsg_file_write(id, prio, filename, buf, len);
111 }
112
113 // filename rotation
114 if (dot == std::string::npos) {
115 name += ".1";
116 } else {
117 std::string number = name.substr(dot + 1);
118 if (!isdigit(number[0])) {
119 name += ".1";
120 } else {
121 size_t i;
122 if (!android::base::ParseUint(number, &i)) {
123 LOG(ERROR) << "failed to parse uint in " << number;
124 return -1;
125 }
126 name = sub + "." + std::to_string(i + 1);
127 }
128 }
129
130 return __android_log_pmsg_file_write(id, prio, name.c_str(), buf, len);
131}
132
133// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max.
134// Similarly rename last_kmsg -> last_kmsg.1 -> ... -> last_kmsg.$max.
135// Overwrite any existing last_log.$max and last_kmsg.$max.
136void rotate_logs(const char* last_log_file, const char* last_kmsg_file) {
137 // Logs should only be rotated once.
138 static bool rotated = false;
139 if (rotated) {
140 return;
141 }
142 rotated = true;
143
144 for (int i = KEEP_LOG_COUNT - 1; i >= 0; --i) {
145 std::string old_log = android::base::StringPrintf("%s", last_log_file);
146 if (i > 0) {
147 old_log += "." + std::to_string(i);
148 }
149 std::string new_log = android::base::StringPrintf("%s.%d", last_log_file, i + 1);
150 // Ignore errors if old_log doesn't exist.
151 rename(old_log.c_str(), new_log.c_str());
152
153 std::string old_kmsg = android::base::StringPrintf("%s", last_kmsg_file);
154 if (i > 0) {
155 old_kmsg += "." + std::to_string(i);
156 }
157 std::string new_kmsg = android::base::StringPrintf("%s.%d", last_kmsg_file, i + 1);
158 rename(old_kmsg.c_str(), new_kmsg.c_str());
159 }
160}
161
162// Writes content to the current pmsg session.
163static ssize_t __pmsg_write(const std::string& filename, const std::string& buf) {
164 return __android_log_pmsg_file_write(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filename.c_str(),
165 buf.data(), buf.size());
166}
167
168void copy_log_file_to_pmsg(const std::string& source, const std::string& destination) {
169 std::string content;
170 android::base::ReadFileToString(source, &content);
171 __pmsg_write(destination, content);
172}
173
174// How much of the temp log we have copied to the copy in cache.
175static off_t tmplog_offset = 0;
176
177void reset_tmplog_offset() {
178 tmplog_offset = 0;
179}
180
xunchang316e9712019-04-12 16:22:15 -0700181static void copy_log_file(const std::string& source, const std::string& destination, bool append,
182 const selabel_handle* sehandle) {
183 FILE* dest_fp = fopen_path(destination, append ? "ae" : "we", sehandle);
Jerry Zhang152933a2018-05-02 16:56:00 -0700184 if (dest_fp == nullptr) {
185 PLOG(ERROR) << "Can't open " << destination;
186 } else {
187 FILE* source_fp = fopen(source.c_str(), "re");
188 if (source_fp != nullptr) {
189 if (append) {
190 fseeko(source_fp, tmplog_offset, SEEK_SET); // Since last write
191 }
192 char buf[4096];
193 size_t bytes;
194 while ((bytes = fread(buf, 1, sizeof(buf), source_fp)) != 0) {
195 fwrite(buf, 1, bytes, dest_fp);
196 }
197 if (append) {
198 tmplog_offset = ftello(source_fp);
199 }
200 check_and_fclose(source_fp, source);
201 }
202 check_and_fclose(dest_fp, destination);
203 }
204}
205
xunchang316e9712019-04-12 16:22:15 -0700206void copy_logs(bool save_current_log, bool has_cache, const selabel_handle* sehandle) {
207 // We only rotate and record the log of the current session if explicitly requested. This usually
208 // happens after wipes, installation from BCB or menu selections. This is to avoid unnecessary
Jerry Zhang152933a2018-05-02 16:56:00 -0700209 // rotation (and possible deletion) of log files, if it does not do anything loggable.
xunchang316e9712019-04-12 16:22:15 -0700210 if (!save_current_log) {
Jerry Zhang152933a2018-05-02 16:56:00 -0700211 return;
212 }
213
214 // Always write to pmsg, this allows the OTA logs to be caught in `logcat -L`.
215 copy_log_file_to_pmsg(Paths::Get().temporary_log_file(), LAST_LOG_FILE);
216 copy_log_file_to_pmsg(Paths::Get().temporary_install_file(), LAST_INSTALL_FILE);
217
218 // We can do nothing for now if there's no /cache partition.
219 if (!has_cache) {
220 return;
221 }
222
223 ensure_path_mounted(LAST_LOG_FILE);
224 ensure_path_mounted(LAST_KMSG_FILE);
225 rotate_logs(LAST_LOG_FILE, LAST_KMSG_FILE);
226
227 // Copy logs to cache so the system can find out what happened.
xunchang316e9712019-04-12 16:22:15 -0700228 copy_log_file(Paths::Get().temporary_log_file(), LOG_FILE, true, sehandle);
229 copy_log_file(Paths::Get().temporary_log_file(), LAST_LOG_FILE, false, sehandle);
230 copy_log_file(Paths::Get().temporary_install_file(), LAST_INSTALL_FILE, false, sehandle);
Jerry Zhang152933a2018-05-02 16:56:00 -0700231 save_kernel_log(LAST_KMSG_FILE);
232 chmod(LOG_FILE, 0600);
233 chown(LOG_FILE, AID_SYSTEM, AID_SYSTEM);
234 chmod(LAST_KMSG_FILE, 0600);
235 chown(LAST_KMSG_FILE, AID_SYSTEM, AID_SYSTEM);
236 chmod(LAST_LOG_FILE, 0640);
237 chmod(LAST_INSTALL_FILE, 0644);
Tianjie Xu2b1a4642018-09-06 11:58:55 -0700238 chown(LAST_INSTALL_FILE, AID_SYSTEM, AID_SYSTEM);
Jerry Zhang152933a2018-05-02 16:56:00 -0700239 sync();
240}
241
242// Read from kernel log into buffer and write out to file.
243void save_kernel_log(const char* destination) {
244 int klog_buf_len = klogctl(KLOG_SIZE_BUFFER, 0, 0);
245 if (klog_buf_len <= 0) {
246 PLOG(ERROR) << "Error getting klog size";
247 return;
248 }
249
250 std::string buffer(klog_buf_len, 0);
251 int n = klogctl(KLOG_READ_ALL, &buffer[0], klog_buf_len);
252 if (n == -1) {
253 PLOG(ERROR) << "Error in reading klog";
254 return;
255 }
256 buffer.resize(n);
257 android::base::WriteStringToFile(buffer, destination);
258}
xunchang2239b9e2019-04-15 15:24:24 -0700259
260std::vector<saved_log_file> ReadLogFilesToMemory() {
261 ensure_path_mounted("/cache");
262
263 struct dirent* de;
264 std::unique_ptr<DIR, decltype(&closedir)> d(opendir(CACHE_LOG_DIR), closedir);
265 if (!d) {
266 if (errno != ENOENT) {
267 PLOG(ERROR) << "Failed to opendir " << CACHE_LOG_DIR;
268 }
269 return {};
270 }
271
272 std::vector<saved_log_file> log_files;
273 while ((de = readdir(d.get())) != nullptr) {
274 if (strncmp(de->d_name, "last_", 5) == 0 || strcmp(de->d_name, "log") == 0) {
275 std::string path = android::base::StringPrintf("%s/%s", CACHE_LOG_DIR, de->d_name);
276
277 struct stat sb;
278 if (stat(path.c_str(), &sb) != 0) {
279 PLOG(ERROR) << "Failed to stat " << path;
280 continue;
281 }
282 // Truncate files to 512kb
283 size_t read_size = std::min<size_t>(sb.st_size, 1 << 19);
284 std::string data(read_size, '\0');
285
286 android::base::unique_fd log_fd(TEMP_FAILURE_RETRY(open(path.c_str(), O_RDONLY)));
287 if (log_fd == -1 || !android::base::ReadFully(log_fd, data.data(), read_size)) {
288 PLOG(ERROR) << "Failed to read log file " << path;
289 continue;
290 }
291
292 log_files.emplace_back(saved_log_file{ path, sb, data });
293 }
294 }
295
296 return log_files;
297}
298
299bool RestoreLogFilesAfterFormat(const std::vector<saved_log_file>& log_files) {
300 // Re-create the log dir and write back the log entries.
301 if (ensure_path_mounted(CACHE_LOG_DIR) != 0) {
302 PLOG(ERROR) << "Failed to mount " << CACHE_LOG_DIR;
303 return false;
304 }
305
306 if (mkdir_recursively(CACHE_LOG_DIR, 0777, false, logging_sehandle) != 0) {
307 PLOG(ERROR) << "Failed to create " << CACHE_LOG_DIR;
308 return false;
309 }
310
311 for (const auto& log : log_files) {
312 if (!android::base::WriteStringToFile(log.data, log.name, log.sb.st_mode, log.sb.st_uid,
313 log.sb.st_gid)) {
314 PLOG(ERROR) << "Failed to write to " << log.name;
315 }
316 }
317
318 // Any part of the log we'd copied to cache is now gone.
319 // Reset the pointer so we copy from the beginning of the temp
320 // log.
321 reset_tmplog_offset();
322 copy_logs(true /* save_current_log */, true /* has_cache */, logging_sehandle);
323
324 return true;
325}