Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012-2013 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 | |
Mark Salyzyn | fa3716b | 2014-02-14 16:05:05 -0800 | [diff] [blame] | 17 | #include <ctype.h> |
Mark Salyzyn | fa3add3 | 2016-12-29 07:26:30 -0800 | [diff] [blame] | 18 | #include <inttypes.h> |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 19 | #include <poll.h> |
Mark Salyzyn | 8daa9af | 2014-04-28 14:07:23 -0700 | [diff] [blame] | 20 | #include <sys/prctl.h> |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 21 | #include <sys/socket.h> |
Mark Salyzyn | 5c77ad5 | 2016-02-23 08:55:43 -0800 | [diff] [blame] | 22 | #include <sys/types.h> |
Mark Salyzyn | dfc47e8 | 2014-03-24 10:26:47 -0700 | [diff] [blame] | 23 | |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 24 | #include <cutils/sockets.h> |
Mark Salyzyn | aeaaf81 | 2016-09-30 13:30:33 -0700 | [diff] [blame] | 25 | #include <private/android_logger.h> |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 26 | |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 27 | #include "FlushCommand.h" |
Mark Salyzyn | 2ad0bd0 | 2016-02-23 08:55:43 -0800 | [diff] [blame] | 28 | #include "LogBuffer.h" |
| 29 | #include "LogBufferElement.h" |
| 30 | #include "LogReader.h" |
| 31 | #include "LogUtils.h" |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 32 | |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 33 | LogReader::LogReader(LogBuffer* logbuf) |
| 34 | : SocketListener(getLogSocket(), true), mLogbuf(*logbuf) { |
Mark Salyzyn | 7718778 | 2015-05-12 15:21:31 -0700 | [diff] [blame] | 35 | } |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 36 | |
| 37 | // When we are notified a new log entry is available, inform |
Hao Wang | f6e2296 | 2017-12-04 14:10:40 +0800 | [diff] [blame] | 38 | // listening sockets who are watching this entry's log id. |
| 39 | void LogReader::notifyNewLog(log_mask_t logMask) { |
| 40 | FlushCommand command(*this, logMask); |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 41 | runOnEachSocket(&command); |
| 42 | } |
| 43 | |
Tom Cherry | 4f22786 | 2018-10-08 17:33:50 -0700 | [diff] [blame] | 44 | // Note returning false will release the SocketClient instance. |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 45 | bool LogReader::onDataAvailable(SocketClient* cli) { |
Mark Salyzyn | e3aeeee | 2015-03-17 07:56:32 -0700 | [diff] [blame] | 46 | static bool name_set; |
| 47 | if (!name_set) { |
| 48 | prctl(PR_SET_NAME, "logd.reader"); |
| 49 | name_set = true; |
| 50 | } |
Mark Salyzyn | 8daa9af | 2014-04-28 14:07:23 -0700 | [diff] [blame] | 51 | |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 52 | char buffer[255]; |
| 53 | |
| 54 | int len = read(cli->getSocket(), buffer, sizeof(buffer) - 1); |
| 55 | if (len <= 0) { |
| 56 | doSocketDelete(cli); |
| 57 | return false; |
| 58 | } |
| 59 | buffer[len] = '\0'; |
| 60 | |
Tom Cherry | 4f22786 | 2018-10-08 17:33:50 -0700 | [diff] [blame] | 61 | // Clients are only allowed to send one command, disconnect them if they |
| 62 | // send another. |
| 63 | LogTimeEntry::wrlock(); |
| 64 | for (const auto& entry : mLogbuf.mTimes) { |
| 65 | if (entry->mClient == cli) { |
| 66 | entry->release_Locked(); |
| 67 | LogTimeEntry::unlock(); |
| 68 | return false; |
| 69 | } |
| 70 | } |
| 71 | LogTimeEntry::unlock(); |
| 72 | |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 73 | unsigned long tail = 0; |
| 74 | static const char _tail[] = " tail="; |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 75 | char* cp = strstr(buffer, _tail); |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 76 | if (cp) { |
| 77 | tail = atol(cp + sizeof(_tail) - 1); |
| 78 | } |
| 79 | |
Mark Salyzyn | fa3716b | 2014-02-14 16:05:05 -0800 | [diff] [blame] | 80 | log_time start(log_time::EPOCH); |
| 81 | static const char _start[] = " start="; |
| 82 | cp = strstr(buffer, _start); |
| 83 | if (cp) { |
| 84 | // Parse errors will result in current time |
| 85 | start.strptime(cp + sizeof(_start) - 1, "%s.%q"); |
| 86 | } |
| 87 | |
Mark Salyzyn | b75cce0 | 2015-11-30 11:35:56 -0800 | [diff] [blame] | 88 | uint64_t timeout = 0; |
| 89 | static const char _timeout[] = " timeout="; |
| 90 | cp = strstr(buffer, _timeout); |
| 91 | if (cp) { |
Tom Cherry | c9fa42c | 2020-04-08 10:37:09 -0700 | [diff] [blame] | 92 | timeout = atol(cp + sizeof(_timeout) - 1) * NS_PER_SEC + log_time(CLOCK_MONOTONIC).nsec(); |
Mark Salyzyn | b75cce0 | 2015-11-30 11:35:56 -0800 | [diff] [blame] | 93 | } |
| 94 | |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 95 | unsigned int logMask = -1; |
| 96 | static const char _logIds[] = " lids="; |
| 97 | cp = strstr(buffer, _logIds); |
| 98 | if (cp) { |
| 99 | logMask = 0; |
| 100 | cp += sizeof(_logIds) - 1; |
| 101 | while (*cp && *cp != '\0') { |
| 102 | int val = 0; |
Mark Salyzyn | fa3716b | 2014-02-14 16:05:05 -0800 | [diff] [blame] | 103 | while (isdigit(*cp)) { |
| 104 | val = val * 10 + *cp - '0'; |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 105 | ++cp; |
| 106 | } |
| 107 | logMask |= 1 << val; |
| 108 | if (*cp != ',') { |
| 109 | break; |
| 110 | } |
| 111 | ++cp; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | pid_t pid = 0; |
| 116 | static const char _pid[] = " pid="; |
| 117 | cp = strstr(buffer, _pid); |
| 118 | if (cp) { |
| 119 | pid = atol(cp + sizeof(_pid) - 1); |
| 120 | } |
| 121 | |
| 122 | bool nonBlock = false; |
Mark Salyzyn | 0eeb06b | 2016-12-02 10:08:48 -0800 | [diff] [blame] | 123 | if (!fastcmp<strncmp>(buffer, "dumpAndClose", 12)) { |
Mark Salyzyn | f669acb | 2014-09-16 09:19:47 -0700 | [diff] [blame] | 124 | // Allow writer to get some cycles, and wait for pending notifications |
| 125 | sched_yield(); |
Mark Salyzyn | 3c501b5 | 2017-04-18 14:09:45 -0700 | [diff] [blame] | 126 | LogTimeEntry::wrlock(); |
Mark Salyzyn | f669acb | 2014-09-16 09:19:47 -0700 | [diff] [blame] | 127 | LogTimeEntry::unlock(); |
| 128 | sched_yield(); |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 129 | nonBlock = true; |
| 130 | } |
| 131 | |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 132 | uint64_t sequence = 1; |
| 133 | // Convert realtime to sequence number |
| 134 | if (start != log_time::EPOCH) { |
| 135 | class LogFindStart { |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 136 | const pid_t mPid; |
| 137 | const unsigned mLogMask; |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 138 | bool startTimeSet; |
| 139 | log_time& start; |
| 140 | uint64_t& sequence; |
| 141 | uint64_t last; |
| 142 | bool isMonotonic; |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 143 | |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 144 | public: |
| 145 | LogFindStart(unsigned logMask, pid_t pid, log_time& start, uint64_t& sequence, |
Mark Salyzyn | 5a34d6e | 2017-03-10 08:44:14 -0800 | [diff] [blame] | 146 | bool isMonotonic) |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 147 | : mPid(pid), |
| 148 | mLogMask(logMask), |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 149 | startTimeSet(false), |
| 150 | start(start), |
| 151 | sequence(sequence), |
| 152 | last(sequence), |
| 153 | isMonotonic(isMonotonic) {} |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 154 | |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 155 | static int callback(const LogBufferElement* element, void* obj) { |
| 156 | LogFindStart* me = reinterpret_cast<LogFindStart*>(obj); |
| 157 | if ((!me->mPid || (me->mPid == element->getPid())) && |
| 158 | (me->mLogMask & (1 << element->getLogId()))) { |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 159 | if (me->start == element->getRealTime()) { |
| 160 | me->sequence = element->getSequence(); |
| 161 | me->startTimeSet = true; |
Mark Salyzyn | f7c0f75 | 2015-03-03 13:39:37 -0800 | [diff] [blame] | 162 | return -1; |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 163 | } else if (!me->isMonotonic || android::isMonotonic(element->getRealTime())) { |
| 164 | if (me->start < element->getRealTime()) { |
| 165 | me->sequence = me->last; |
| 166 | me->startTimeSet = true; |
Mark Salyzyn | f7c0f75 | 2015-03-03 13:39:37 -0800 | [diff] [blame] | 167 | return -1; |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 168 | } |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 169 | me->last = element->getSequence(); |
Mark Salyzyn | b6bee33 | 2015-09-08 08:56:32 -0700 | [diff] [blame] | 170 | } else { |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 171 | me->last = element->getSequence(); |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 172 | } |
| 173 | } |
| 174 | return false; |
| 175 | } |
| 176 | |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 177 | bool found() { return startTimeSet; } |
| 178 | } logFindStart(logMask, pid, start, sequence, |
Mark Salyzyn | b6bee33 | 2015-09-08 08:56:32 -0700 | [diff] [blame] | 179 | logbuf().isMonotonic() && android::isMonotonic(start)); |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 180 | |
Mark Salyzyn | ae2abf1 | 2017-03-31 10:48:39 -0700 | [diff] [blame] | 181 | logbuf().flushTo(cli, sequence, nullptr, FlushCommand::hasReadLogs(cli), |
Mark Salyzyn | 8fa8896 | 2016-01-26 14:32:35 -0800 | [diff] [blame] | 182 | FlushCommand::hasSecurityLogs(cli), |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 183 | logFindStart.callback, &logFindStart); |
| 184 | |
| 185 | if (!logFindStart.found()) { |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 186 | if (nonBlock) { |
| 187 | doSocketDelete(cli); |
| 188 | return false; |
| 189 | } |
| 190 | sequence = LogBufferElement::getCurrentSequence(); |
Mark Salyzyn | a1c60cf | 2014-02-19 07:33:12 -0800 | [diff] [blame] | 191 | } |
Mark Salyzyn | fa3716b | 2014-02-14 16:05:05 -0800 | [diff] [blame] | 192 | } |
| 193 | |
Mark Salyzyn | fa3add3 | 2016-12-29 07:26:30 -0800 | [diff] [blame] | 194 | android::prdebug( |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 195 | "logdr: UID=%d GID=%d PID=%d %c tail=%lu logMask=%x pid=%d " |
| 196 | "start=%" PRIu64 "ns timeout=%" PRIu64 "ns\n", |
| 197 | cli->getUid(), cli->getGid(), cli->getPid(), nonBlock ? 'n' : 'b', tail, logMask, |
| 198 | (int)pid, start.nsec(), timeout); |
Mark Salyzyn | fa3add3 | 2016-12-29 07:26:30 -0800 | [diff] [blame] | 199 | |
Tom Cherry | 10d086e | 2019-08-21 14:16:34 -0700 | [diff] [blame^] | 200 | if (start == log_time::EPOCH) { |
Tom Cherry | e2d30d1 | 2018-10-19 13:51:35 -0700 | [diff] [blame] | 201 | timeout = 0; |
| 202 | } |
| 203 | |
Tom Cherry | 4f22786 | 2018-10-08 17:33:50 -0700 | [diff] [blame] | 204 | LogTimeEntry::wrlock(); |
| 205 | auto entry = std::make_unique<LogTimeEntry>( |
| 206 | *this, cli, nonBlock, tail, logMask, pid, sequence, timeout); |
| 207 | if (!entry->startReader_Locked()) { |
| 208 | LogTimeEntry::unlock(); |
| 209 | return false; |
| 210 | } |
| 211 | |
| 212 | // release client and entry reference counts once done |
| 213 | cli->incRef(); |
| 214 | mLogbuf.mTimes.emplace_front(std::move(entry)); |
Mark Salyzyn | 5c77ad5 | 2016-02-23 08:55:43 -0800 | [diff] [blame] | 215 | |
| 216 | // Set acceptable upper limit to wait for slow reader processing b/27242723 |
| 217 | struct timeval t = { LOGD_SNDTIMEO, 0 }; |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 218 | setsockopt(cli->getSocket(), SOL_SOCKET, SO_SNDTIMEO, (const char*)&t, |
| 219 | sizeof(t)); |
Mark Salyzyn | 5c77ad5 | 2016-02-23 08:55:43 -0800 | [diff] [blame] | 220 | |
Tom Cherry | 4f22786 | 2018-10-08 17:33:50 -0700 | [diff] [blame] | 221 | LogTimeEntry::unlock(); |
| 222 | |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 223 | return true; |
| 224 | } |
| 225 | |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 226 | void LogReader::doSocketDelete(SocketClient* cli) { |
| 227 | LastLogTimes& times = mLogbuf.mTimes; |
Mark Salyzyn | 3c501b5 | 2017-04-18 14:09:45 -0700 | [diff] [blame] | 228 | LogTimeEntry::wrlock(); |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 229 | LastLogTimes::iterator it = times.begin(); |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 230 | while (it != times.end()) { |
Tom Cherry | 4f22786 | 2018-10-08 17:33:50 -0700 | [diff] [blame] | 231 | LogTimeEntry* entry = it->get(); |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 232 | if (entry->mClient == cli) { |
Mark Salyzyn | 0175b07 | 2014-02-26 09:50:16 -0800 | [diff] [blame] | 233 | entry->release_Locked(); |
| 234 | break; |
| 235 | } |
| 236 | it++; |
| 237 | } |
| 238 | LogTimeEntry::unlock(); |
| 239 | } |
Mark Salyzyn | dfc47e8 | 2014-03-24 10:26:47 -0700 | [diff] [blame] | 240 | |
| 241 | int LogReader::getLogSocket() { |
| 242 | static const char socketName[] = "logdr"; |
| 243 | int sock = android_get_control_socket(socketName); |
| 244 | |
| 245 | if (sock < 0) { |
Mark Salyzyn | 501c373 | 2017-03-10 14:31:54 -0800 | [diff] [blame] | 246 | sock = socket_local_server( |
| 247 | socketName, ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET); |
Mark Salyzyn | dfc47e8 | 2014-03-24 10:26:47 -0700 | [diff] [blame] | 248 | } |
| 249 | |
| 250 | return sock; |
| 251 | } |