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-rw-r--r--logging.cpp243
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diff --git a/logging.cpp b/logging.cpp
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+/*
+ * 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 "logging.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/klog.h>
+#include <sys/types.h>
+
+#include <string>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/parseint.h>
+#include <android-base/stringprintf.h>
+#include <private/android_filesystem_config.h> /* for AID_SYSTEM */
+#include <private/android_logger.h> /* private pmsg functions */
+
+#include "common.h"
+#include "otautil/dirutil.h"
+#include "otautil/paths.h"
+#include "roots.h"
+
+static constexpr const char* LOG_FILE = "/cache/recovery/log";
+static constexpr const char* LAST_INSTALL_FILE = "/cache/recovery/last_install";
+static constexpr const char* LAST_KMSG_FILE = "/cache/recovery/last_kmsg";
+static constexpr const char* LAST_LOG_FILE = "/cache/recovery/last_log";
+
+static const std::string LAST_KMSG_FILTER = "recovery/last_kmsg";
+static const std::string LAST_LOG_FILTER = "recovery/last_log";
+
+// fopen(3)'s the given file, by mounting volumes and making parent dirs as necessary. Returns the
+// file pointer, or nullptr on error.
+static FILE* fopen_path(const std::string& path, const char* mode) {
+ if (ensure_path_mounted(path.c_str()) != 0) {
+ LOG(ERROR) << "Can't mount " << path;
+ return nullptr;
+ }
+
+ // When writing, try to create the containing directory, if necessary. Use generous permissions,
+ // the system (init.rc) will reset them.
+ if (strchr("wa", mode[0])) {
+ mkdir_recursively(path, 0777, true, sehandle);
+ }
+ return fopen(path.c_str(), mode);
+}
+
+void check_and_fclose(FILE* fp, const std::string& name) {
+ fflush(fp);
+ if (fsync(fileno(fp)) == -1) {
+ PLOG(ERROR) << "Failed to fsync " << name;
+ }
+ if (ferror(fp)) {
+ PLOG(ERROR) << "Error in " << name;
+ }
+ fclose(fp);
+}
+
+// close a file, log an error if the error indicator is set
+ssize_t logbasename(log_id_t /* id */, char /* prio */, const char* filename, const char* /* buf */,
+ size_t len, void* arg) {
+ bool* do_rotate = static_cast<bool*>(arg);
+ if (LAST_KMSG_FILTER.find(filename) != std::string::npos ||
+ LAST_LOG_FILTER.find(filename) != std::string::npos) {
+ *do_rotate = true;
+ }
+ return len;
+}
+
+ssize_t logrotate(log_id_t id, char prio, const char* filename, const char* buf, size_t len,
+ void* arg) {
+ bool* do_rotate = static_cast<bool*>(arg);
+ if (!*do_rotate) {
+ return __android_log_pmsg_file_write(id, prio, filename, buf, len);
+ }
+
+ std::string name(filename);
+ size_t dot = name.find_last_of('.');
+ std::string sub = name.substr(0, dot);
+
+ if (LAST_KMSG_FILTER.find(sub) == std::string::npos &&
+ LAST_LOG_FILTER.find(sub) == std::string::npos) {
+ return __android_log_pmsg_file_write(id, prio, filename, buf, len);
+ }
+
+ // filename rotation
+ if (dot == std::string::npos) {
+ name += ".1";
+ } else {
+ std::string number = name.substr(dot + 1);
+ if (!isdigit(number[0])) {
+ name += ".1";
+ } else {
+ size_t i;
+ if (!android::base::ParseUint(number, &i)) {
+ LOG(ERROR) << "failed to parse uint in " << number;
+ return -1;
+ }
+ name = sub + "." + std::to_string(i + 1);
+ }
+ }
+
+ return __android_log_pmsg_file_write(id, prio, name.c_str(), buf, len);
+}
+
+// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max.
+// Similarly rename last_kmsg -> last_kmsg.1 -> ... -> last_kmsg.$max.
+// Overwrite any existing last_log.$max and last_kmsg.$max.
+void rotate_logs(const char* last_log_file, const char* last_kmsg_file) {
+ // Logs should only be rotated once.
+ static bool rotated = false;
+ if (rotated) {
+ return;
+ }
+ rotated = true;
+
+ for (int i = KEEP_LOG_COUNT - 1; i >= 0; --i) {
+ std::string old_log = android::base::StringPrintf("%s", last_log_file);
+ if (i > 0) {
+ old_log += "." + std::to_string(i);
+ }
+ std::string new_log = android::base::StringPrintf("%s.%d", last_log_file, i + 1);
+ // Ignore errors if old_log doesn't exist.
+ rename(old_log.c_str(), new_log.c_str());
+
+ std::string old_kmsg = android::base::StringPrintf("%s", last_kmsg_file);
+ if (i > 0) {
+ old_kmsg += "." + std::to_string(i);
+ }
+ std::string new_kmsg = android::base::StringPrintf("%s.%d", last_kmsg_file, i + 1);
+ rename(old_kmsg.c_str(), new_kmsg.c_str());
+ }
+}
+
+// Writes content to the current pmsg session.
+static ssize_t __pmsg_write(const std::string& filename, const std::string& buf) {
+ return __android_log_pmsg_file_write(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filename.c_str(),
+ buf.data(), buf.size());
+}
+
+void copy_log_file_to_pmsg(const std::string& source, const std::string& destination) {
+ std::string content;
+ android::base::ReadFileToString(source, &content);
+ __pmsg_write(destination, content);
+}
+
+// How much of the temp log we have copied to the copy in cache.
+static off_t tmplog_offset = 0;
+
+void reset_tmplog_offset() {
+ tmplog_offset = 0;
+}
+
+void copy_log_file(const std::string& source, const std::string& destination, bool append) {
+ FILE* dest_fp = fopen_path(destination, append ? "ae" : "we");
+ if (dest_fp == nullptr) {
+ PLOG(ERROR) << "Can't open " << destination;
+ } else {
+ FILE* source_fp = fopen(source.c_str(), "re");
+ if (source_fp != nullptr) {
+ if (append) {
+ fseeko(source_fp, tmplog_offset, SEEK_SET); // Since last write
+ }
+ char buf[4096];
+ size_t bytes;
+ while ((bytes = fread(buf, 1, sizeof(buf), source_fp)) != 0) {
+ fwrite(buf, 1, bytes, dest_fp);
+ }
+ if (append) {
+ tmplog_offset = ftello(source_fp);
+ }
+ check_and_fclose(source_fp, source);
+ }
+ check_and_fclose(dest_fp, destination);
+ }
+}
+
+void copy_logs(bool modified_flash, bool has_cache) {
+ // We only rotate and record the log of the current session if there are actual attempts to modify
+ // the flash, such as wipes, installs from BCB or menu selections. This is to avoid unnecessary
+ // rotation (and possible deletion) of log files, if it does not do anything loggable.
+ if (!modified_flash) {
+ return;
+ }
+
+ // Always write to pmsg, this allows the OTA logs to be caught in `logcat -L`.
+ copy_log_file_to_pmsg(Paths::Get().temporary_log_file(), LAST_LOG_FILE);
+ copy_log_file_to_pmsg(Paths::Get().temporary_install_file(), LAST_INSTALL_FILE);
+
+ // We can do nothing for now if there's no /cache partition.
+ if (!has_cache) {
+ return;
+ }
+
+ ensure_path_mounted(LAST_LOG_FILE);
+ ensure_path_mounted(LAST_KMSG_FILE);
+ rotate_logs(LAST_LOG_FILE, LAST_KMSG_FILE);
+
+ // Copy logs to cache so the system can find out what happened.
+ copy_log_file(Paths::Get().temporary_log_file(), LOG_FILE, true);
+ copy_log_file(Paths::Get().temporary_log_file(), LAST_LOG_FILE, false);
+ copy_log_file(Paths::Get().temporary_install_file(), LAST_INSTALL_FILE, false);
+ save_kernel_log(LAST_KMSG_FILE);
+ chmod(LOG_FILE, 0600);
+ chown(LOG_FILE, AID_SYSTEM, AID_SYSTEM);
+ chmod(LAST_KMSG_FILE, 0600);
+ chown(LAST_KMSG_FILE, AID_SYSTEM, AID_SYSTEM);
+ chmod(LAST_LOG_FILE, 0640);
+ chmod(LAST_INSTALL_FILE, 0644);
+ sync();
+}
+
+// Read from kernel log into buffer and write out to file.
+void save_kernel_log(const char* destination) {
+ int klog_buf_len = klogctl(KLOG_SIZE_BUFFER, 0, 0);
+ if (klog_buf_len <= 0) {
+ PLOG(ERROR) << "Error getting klog size";
+ return;
+ }
+
+ std::string buffer(klog_buf_len, 0);
+ int n = klogctl(KLOG_READ_ALL, &buffer[0], klog_buf_len);
+ if (n == -1) {
+ PLOG(ERROR) << "Error in reading klog";
+ return;
+ }
+ buffer.resize(n);
+ android::base::WriteStringToFile(buffer, destination);
+}
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