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256 lines
8.0 KiB
256 lines
8.0 KiB
/*
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* Copyright (C) 2012-2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <inttypes.h>
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#include <poll.h>
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#include <sched.h>
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#include <sys/prctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <chrono>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <cutils/sockets.h>
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#include <private/android_filesystem_config.h>
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#include <private/android_logger.h>
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#include "LogBuffer.h"
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#include "LogBufferElement.h"
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#include "LogPermissions.h"
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#include "LogReader.h"
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#include "LogUtils.h"
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#include "LogWriter.h"
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static bool CanReadSecurityLogs(SocketClient* client) {
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return client->getUid() == AID_SYSTEM || client->getGid() == AID_SYSTEM;
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}
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static std::string SocketClientToName(SocketClient* client) {
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return android::base::StringPrintf("pid %d, fd %d", client->getPid(), client->getSocket());
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}
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class SocketLogWriter : public LogWriter {
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public:
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SocketLogWriter(LogReader* reader, SocketClient* client, bool privileged)
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: LogWriter(client->getUid(), privileged), reader_(reader), client_(client) {}
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bool Write(const logger_entry& entry, const char* msg) override {
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struct iovec iovec[2];
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iovec[0].iov_base = const_cast<logger_entry*>(&entry);
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iovec[0].iov_len = entry.hdr_size;
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iovec[1].iov_base = const_cast<char*>(msg);
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iovec[1].iov_len = entry.len;
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return client_->sendDatav(iovec, 1 + (entry.len != 0)) == 0;
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}
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void Release() override {
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reader_->release(client_);
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client_->decRef();
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}
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void Shutdown() override { shutdown(client_->getSocket(), SHUT_RDWR); }
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std::string name() const override { return SocketClientToName(client_); }
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private:
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LogReader* reader_;
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SocketClient* client_;
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};
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LogReader::LogReader(LogBuffer* logbuf, LogReaderList* reader_list)
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: SocketListener(getLogSocket(), true), log_buffer_(logbuf), reader_list_(reader_list) {}
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// Note returning false will release the SocketClient instance.
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bool LogReader::onDataAvailable(SocketClient* cli) {
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static bool name_set;
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if (!name_set) {
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prctl(PR_SET_NAME, "logd.reader");
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name_set = true;
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}
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char buffer[255];
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int len = read(cli->getSocket(), buffer, sizeof(buffer) - 1);
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if (len <= 0) {
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DoSocketDelete(cli);
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return false;
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}
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buffer[len] = '\0';
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// Clients are only allowed to send one command, disconnect them if they send another.
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if (DoSocketDelete(cli)) {
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return false;
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}
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unsigned long tail = 0;
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static const char _tail[] = " tail=";
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char* cp = strstr(buffer, _tail);
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if (cp) {
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tail = atol(cp + sizeof(_tail) - 1);
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}
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log_time start(log_time::EPOCH);
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static const char _start[] = " start=";
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cp = strstr(buffer, _start);
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if (cp) {
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// Parse errors will result in current time
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start.strptime(cp + sizeof(_start) - 1, "%s.%q");
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}
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std::chrono::steady_clock::time_point deadline = {};
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static const char _timeout[] = " timeout=";
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cp = strstr(buffer, _timeout);
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if (cp) {
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long timeout_seconds = atol(cp + sizeof(_timeout) - 1);
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deadline = std::chrono::steady_clock::now() + std::chrono::seconds(timeout_seconds);
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}
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unsigned int logMask = -1;
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static const char _logIds[] = " lids=";
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cp = strstr(buffer, _logIds);
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if (cp) {
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logMask = 0;
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cp += sizeof(_logIds) - 1;
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while (*cp != '\0') {
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int val = 0;
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while (isdigit(*cp)) {
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val = val * 10 + *cp - '0';
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++cp;
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}
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logMask |= 1 << val;
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if (*cp != ',') {
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break;
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}
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++cp;
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}
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}
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pid_t pid = 0;
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static const char _pid[] = " pid=";
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cp = strstr(buffer, _pid);
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if (cp) {
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pid = atol(cp + sizeof(_pid) - 1);
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}
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bool nonBlock = false;
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if (!fastcmp<strncmp>(buffer, "dumpAndClose", 12)) {
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// Allow writer to get some cycles, and wait for pending notifications
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sched_yield();
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logd_lock.lock();
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logd_lock.unlock();
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sched_yield();
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nonBlock = true;
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}
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bool privileged = clientHasLogCredentials(cli);
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bool can_read_security = CanReadSecurityLogs(cli);
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if (!can_read_security) {
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logMask &= ~(1 << LOG_ID_SECURITY);
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}
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std::unique_ptr<LogWriter> socket_log_writer(new SocketLogWriter(this, cli, privileged));
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uint64_t sequence = 1;
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// Convert realtime to sequence number
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if (start != log_time::EPOCH) {
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bool start_time_set = false;
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uint64_t last = sequence;
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auto log_find_start = [pid, start, &sequence, &start_time_set, &last](
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log_id_t, pid_t element_pid, uint64_t element_sequence,
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log_time element_realtime) -> FilterResult {
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if (pid && pid != element_pid) {
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return FilterResult::kSkip;
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}
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if (start == element_realtime) {
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sequence = element_sequence;
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start_time_set = true;
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return FilterResult::kStop;
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} else {
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if (start < element_realtime) {
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sequence = last;
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start_time_set = true;
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return FilterResult::kStop;
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}
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last = element_sequence;
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}
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return FilterResult::kSkip;
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};
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auto lock = std::lock_guard{logd_lock};
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auto flush_to_state = log_buffer_->CreateFlushToState(sequence, logMask);
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log_buffer_->FlushTo(socket_log_writer.get(), *flush_to_state, log_find_start);
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if (!start_time_set) {
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if (nonBlock) {
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return false;
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}
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sequence = log_buffer_->sequence();
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}
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}
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LOG(INFO) << android::base::StringPrintf(
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"logdr: UID=%d GID=%d PID=%d %c tail=%lu logMask=%x pid=%d "
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"start=%" PRIu64 "ns deadline=%" PRIi64 "ns",
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cli->getUid(), cli->getGid(), cli->getPid(), nonBlock ? 'n' : 'b', tail, logMask,
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(int)pid, start.nsec(), static_cast<int64_t>(deadline.time_since_epoch().count()));
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if (start == log_time::EPOCH) {
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deadline = {};
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}
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auto lock = std::lock_guard{logd_lock};
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auto entry = std::make_unique<LogReaderThread>(log_buffer_, reader_list_,
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std::move(socket_log_writer), nonBlock, tail,
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logMask, pid, start, sequence, deadline);
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// release client and entry reference counts once done
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cli->incRef();
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reader_list_->reader_threads().emplace_front(std::move(entry));
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// Set acceptable upper limit to wait for slow reader processing b/27242723
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struct timeval t = { LOGD_SNDTIMEO, 0 };
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setsockopt(cli->getSocket(), SOL_SOCKET, SO_SNDTIMEO, (const char*)&t,
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sizeof(t));
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return true;
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}
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bool LogReader::DoSocketDelete(SocketClient* cli) {
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auto cli_name = SocketClientToName(cli);
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auto lock = std::lock_guard{logd_lock};
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for (const auto& reader : reader_list_->reader_threads()) {
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if (reader->name() == cli_name) {
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reader->Release();
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return true;
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}
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}
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return false;
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}
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int LogReader::getLogSocket() {
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static const char socketName[] = "logdr";
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int sock = android_get_control_socket(socketName);
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if (sock < 0) {
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sock = socket_local_server(
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socketName, ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET);
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}
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return sock;
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}
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