2 * Copyright (c) 2000 - 2013 Samsung Electronics Co., Ltd All Rights Reserved
4 * Contact: Bumjin Im <bj.im@samsung.com>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License
19 * @file socket-manager.cpp
20 * @author Bartlomiej Grzelewski (b.grzelewski@samsung.com)
22 * @brief Implementation of SocketManager.
28 #include <sys/select.h>
29 #include <sys/signalfd.h>
30 #include <sys/types.h>
31 #include <sys/socket.h>
32 #include <sys/smack.h>
41 #include <systemd/sd-daemon.h>
43 #include <dpl/log/log.h>
44 #include <dpl/assert.h>
46 #include <smack-check.h>
47 #include <socket-manager.h>
51 const time_t SOCKET_TIMEOUT = 20;
53 } // namespace anonymous
57 struct DummyService : public GenericSocketService {
58 ServiceDescriptionVector GetServiceDescription() {
59 return ServiceDescriptionVector();
61 void Event(const AcceptEvent &event) { (void)event; }
62 void Event(const WriteEvent &event) { (void)event; }
63 void Event(const ReadEvent &event) { (void)event; }
64 void Event(const CloseEvent &event) { (void)event; }
67 struct SignalService : public GenericSocketService {
72 sigaddset(&mask, SIGTERM);
73 if (-1 == pthread_sigmask(SIG_BLOCK, &mask, NULL))
75 return signalfd(-1, &mask, 0);
78 ServiceDescriptionVector GetServiceDescription() {
79 return ServiceDescriptionVector();
82 void Event(const AcceptEvent &event) { (void)event; } // not supported
83 void Event(const WriteEvent &event) { (void)event; } // not supported
84 void Event(const CloseEvent &event) { (void)event; } // not supported
86 void Event(const ReadEvent &event) {
87 LogDebug("Get signal information");
89 if(sizeof(struct signalfd_siginfo) != event.rawBuffer.size()) {
90 LogError("Wrong size of signalfd_siginfo struct. Expected: "
91 << sizeof(signalfd_siginfo) << " Get: "
92 << event.rawBuffer.size());
96 signalfd_siginfo *siginfo = (signalfd_siginfo*)(&(event.rawBuffer[0]));
98 if (siginfo->ssi_signo == SIGTERM) {
99 LogInfo("Got signal: SIGTERM");
100 static_cast<SocketManager*>(m_serviceManager)->MainLoopStop();
104 LogInfo("This should not happend. Got signal: " << siginfo->ssi_signo);
108 SocketManager::SocketDescription&
109 SocketManager::CreateDefaultReadSocketDescription(int sock, bool timeout)
111 if ((int)m_socketDescriptionVector.size() <= sock)
112 m_socketDescriptionVector.resize(sock+20);
114 auto &desc = m_socketDescriptionVector[sock];
115 desc.isListen = false;
117 desc.interfaceID = 0;
119 desc.counter = ++m_counter;
122 desc.timeout = time(NULL) + SOCKET_TIMEOUT;
123 if (false == desc.isTimeout) {
125 tm.time = desc.timeout;
127 m_timeoutQueue.push(tm);
131 desc.isTimeout = timeout;
133 FD_SET(sock, &m_readSet);
134 m_maxDesc = sock > m_maxDesc ? sock : m_maxDesc;
138 SocketManager::SocketManager()
142 FD_ZERO(&m_writeSet);
143 if (-1 == pipe(m_notifyMe)) {
145 ThrowMsg(Exception::InitFailed, "Error in pipe: " << strerror(err));
147 LogInfo("Pipe: Read desc: " << m_notifyMe[0] << " Write desc: " << m_notifyMe[1]);
149 auto &desc = CreateDefaultReadSocketDescription(m_notifyMe[0], false);
150 desc.service = new DummyService;
152 // std::thread bases on pthread so this should work fine
155 sigaddset(&set, SIGPIPE);
156 pthread_sigmask(SIG_BLOCK, &set, NULL);
158 // add support for TERM signal (passed from systemd)
159 auto *signalService = new SignalService;
160 signalService->SetSocketManager(this);
161 int filefd = signalService->GetDescriptor();
163 LogError("Error in SignalService.GetDescriptor()");
164 delete signalService;
166 auto &desc2 = CreateDefaultReadSocketDescription(filefd, false);
167 desc2.service = signalService;
168 LogInfo("SignalService mounted on " << filefd << " descriptor");
172 SocketManager::~SocketManager() {
173 std::set<GenericSocketService*> serviceMap;
175 // Find all services. Set is used to remove duplicates.
176 // In this implementation, services are not able to react in any way.
177 for (size_t i=0; i < m_socketDescriptionVector.size(); ++i)
178 if (m_socketDescriptionVector[i].isOpen)
179 serviceMap.insert(m_socketDescriptionVector[i].service);
181 // Time to destroy all services.
182 for(auto it = serviceMap.begin(); it != serviceMap.end(); ++it) {
183 LogDebug("delete " << (void*)(*it));
187 for (size_t i = 0; i < m_socketDescriptionVector.size(); ++i)
188 if (m_socketDescriptionVector[i].isOpen)
191 // All socket except one were closed. Now pipe input must be closed.
192 close(m_notifyMe[1]);
195 void SocketManager::ReadyForAccept(int sock) {
196 struct sockaddr_un clientAddr;
197 unsigned int clientLen = sizeof(clientAddr);
198 int client = accept4(sock, (struct sockaddr*) &clientAddr, &clientLen, SOCK_NONBLOCK);
199 // LogInfo("Accept on sock: " << sock << " Socket opended: " << client);
202 LogDebug("Error in accept: " << strerror(err));
206 auto &desc = CreateDefaultReadSocketDescription(client, true);
207 desc.interfaceID = m_socketDescriptionVector[sock].interfaceID;
208 desc.service = m_socketDescriptionVector[sock].service;
210 GenericSocketService::AcceptEvent event;
211 event.connectionID.sock = client;
212 event.connectionID.counter = desc.counter;
213 event.interfaceID = desc.interfaceID;
214 desc.service->Event(event);
217 void SocketManager::ReadyForRead(int sock) {
218 if (m_socketDescriptionVector[sock].isListen) {
219 ReadyForAccept(sock);
223 GenericSocketService::ReadEvent event;
224 event.connectionID.sock = sock;
225 event.connectionID.counter = m_socketDescriptionVector[sock].counter;
226 event.rawBuffer.resize(4096);
228 auto &desc = m_socketDescriptionVector[sock];
229 desc.timeout = time(NULL) + SOCKET_TIMEOUT;
231 ssize_t size = read(sock, &event.rawBuffer[0], 4096);
235 } else if (size >= 0) {
236 event.rawBuffer.resize(size);
237 desc.service->Event(event);
238 } else if (size == -1) {
245 LogDebug("Reading sock error: " << strerror(err));
251 void SocketManager::ReadyForWriteBuffer(int sock) {
252 auto &desc = m_socketDescriptionVector[sock];
253 size_t size = desc.rawBuffer.size();
254 ssize_t result = write(sock, &desc.rawBuffer[0], size);
260 // select will trigger write once again, nothing to do
264 LogDebug("Error during write: " << strerror(err));
268 return; // We do not want to propagate error to next layer
271 desc.rawBuffer.erase(desc.rawBuffer.begin(), desc.rawBuffer.begin()+result);
273 desc.timeout = time(NULL) + SOCKET_TIMEOUT;
275 if (desc.rawBuffer.empty())
276 FD_CLR(sock, &m_writeSet);
278 GenericSocketService::WriteEvent event;
279 event.connectionID.sock = sock;
280 event.connectionID.counter = desc.counter;
282 event.left = desc.rawBuffer.size();
284 desc.service->Event(event);
287 void SocketManager::ReadyForWrite(int sock) {
288 ReadyForWriteBuffer(sock);
291 void SocketManager::MainLoop() {
292 // remove evironment values passed by systemd
293 // uncomment it after removing old security-server code
296 // Daemon is ready to work.
297 sd_notify(0, "READY=1");
301 fd_set readSet = m_readSet;
302 fd_set writeSet = m_writeSet;
304 timeval localTempTimeout;
305 timeval *ptrTimeout = &localTempTimeout;
307 // I need to extract timeout from priority_queue.
308 // Timeout in priority_queue may be deprecated.
309 // I need to find some actual one.
310 while(!m_timeoutQueue.empty()) {
311 auto &top = m_timeoutQueue.top();
312 auto &desc = m_socketDescriptionVector[top.sock];
314 if (top.time == desc.timeout) {
315 // This timeout matches timeout from socket.
319 // This socket was used after timeout in priority queue was set up.
320 // We need to update timeout and find some useable one.
321 Timeout tm = { desc.timeout , top.sock};
322 m_timeoutQueue.pop();
323 m_timeoutQueue.push(tm);
327 if (m_timeoutQueue.empty()) {
328 LogDebug("No usaable timeout found.");
329 ptrTimeout = NULL; // select will wait without timeout
331 time_t currentTime = time(NULL);
332 auto &pqTimeout = m_timeoutQueue.top();
334 // 0 means that select won't block and socket will be closed ;-)
336 currentTime < pqTimeout.time ? pqTimeout.time - currentTime : 0;
337 ptrTimeout->tv_usec = 0;
338 // LogDebug("Set up timeout: " << (int)ptrTimeout->tv_sec
339 // << " seconds. Socket: " << pqTimeout.sock);
342 int ret = select(m_maxDesc+1, &readSet, &writeSet, NULL, ptrTimeout);
344 if (0 == ret) { // timeout
345 Assert(!m_timeoutQueue.empty());
347 Timeout pqTimeout = m_timeoutQueue.top();
348 m_timeoutQueue.pop();
350 auto &desc = m_socketDescriptionVector[pqTimeout.sock];
352 if (!desc.isTimeout || !desc.isOpen) {
353 // Connection was closed. Timeout is useless...
354 desc.isTimeout = false;
358 if (pqTimeout.time < desc.timeout) {
360 // This socket was used after timeout. We need to update timeout.
361 pqTimeout.time = desc.timeout;
362 m_timeoutQueue.push(pqTimeout);
366 // timeout from m_timeoutQueue matches with socket.timeout
367 // and connection is open. Time to close it!
368 // Putting new timeout in queue here is pointless.
369 desc.isTimeout = false;
370 CloseSocket(pqTimeout.sock);
372 // All done. Now we should process next select ;-)
379 LogDebug("EINTR in select");
383 LogError("Error in select: " << strerror(err));
388 for(int i = 0; i<m_maxDesc+1 && ret; ++i) {
389 if (FD_ISSET(i, &readSet)) {
393 if (FD_ISSET(i, &writeSet)) {
402 void SocketManager::MainLoopStop()
408 int SocketManager::GetSocketFromSystemD(
409 const GenericSocketService::ServiceDescription &desc)
413 // TODO optimalization - do it once in object constructor
414 // and remember all information path->sockfd
415 int n = sd_listen_fds(0);
417 LogInfo("sd_listen_fds returns: " << n);
420 LogError("Error in sd_listend_fds");
421 ThrowMsg(Exception::InitFailed, "Error in sd_listend_fds");
424 for(fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START+n; ++fd) {
425 if (0 < sd_is_socket_unix(fd, SOCK_STREAM, 1,
426 desc.serviceHandlerPath.c_str(), 0))
428 LogInfo("Useable socket " << desc.serviceHandlerPath <<
429 " was passed by SystemD under descriptor " << fd);
433 LogInfo("No useable sockets were passed by systemd.");
437 int SocketManager::CreateDomainSocketHelp(
438 const GenericSocketService::ServiceDescription &desc)
442 if (-1 == (sockfd = socket(AF_UNIX, SOCK_STREAM, 0))) {
444 LogError("Error in socket: " << strerror(err));
445 ThrowMsg(Exception::InitFailed, "Error in socket: " << strerror(err));
449 LogInfo("Set up smack label: " << desc.smackLabel);
451 if (0 != smack_fsetlabel(sockfd, desc.smackLabel.c_str(), SMACK_LABEL_IPIN)) {
452 LogError("Error in smack_fsetlabel");
453 ThrowMsg(Exception::InitFailed, "Error in smack_fsetlabel");
456 LogInfo("No smack on platform. Socket won't be securied with smack label!");
460 if (-1 == (flags = fcntl(sockfd, F_GETFL, 0)))
463 if (-1 == fcntl(sockfd, F_SETFL, flags | O_NONBLOCK)) {
466 LogError("Error in fcntl: " << strerror(err));
467 ThrowMsg(Exception::InitFailed, "Error in fcntl: " << strerror(err));
470 sockaddr_un serverAddress;
471 memset(&serverAddress, 0, sizeof(serverAddress));
472 serverAddress.sun_family = AF_UNIX;
473 strcpy(serverAddress.sun_path, desc.serviceHandlerPath.c_str());
474 unlink(serverAddress.sun_path);
476 mode_t originalUmask;
477 originalUmask = umask(0);
479 if (-1 == bind(sockfd, (struct sockaddr*)&serverAddress, sizeof(serverAddress))) {
482 LogError("Error in bind: " << strerror(err));
483 ThrowMsg(Exception::InitFailed, "Error in bind: " << strerror(err));
486 umask(originalUmask);
488 if (-1 == listen(sockfd, 5)) {
491 LogError("Error in listen: " << strerror(err));
492 ThrowMsg(Exception::InitFailed, "Error in listen: " << strerror(err));
498 void SocketManager::CreateDomainSocket(
499 GenericSocketService *service,
500 const GenericSocketService::ServiceDescription &desc)
502 int sockfd = GetSocketFromSystemD(desc);
504 sockfd = CreateDomainSocketHelp(desc);
506 auto &description = CreateDefaultReadSocketDescription(sockfd, false);
508 description.isListen = true;
509 description.interfaceID = desc.interfaceID;
510 description.service = service;
512 LogDebug("Listen on socket: " << sockfd <<
513 " Handler: " << desc.serviceHandlerPath.c_str());
516 void SocketManager::RegisterSocketService(GenericSocketService *service) {
517 service->SetSocketManager(this);
518 auto serviceVector = service->GetServiceDescription();
520 for (auto iter = serviceVector.begin(); iter != serviceVector.end(); ++iter)
521 CreateDomainSocket(service, *iter);
522 } Catch (Exception::Base) {
523 for (int i =0; i < (int)m_socketDescriptionVector.size(); ++i)
525 auto &desc = m_socketDescriptionVector[i];
526 if (desc.service == service && desc.isOpen) {
531 ReThrow(Exception::Base);
535 void SocketManager::Close(ConnectionID connectionID) {
537 std::lock_guard<std::mutex> ulock(m_eventQueueMutex);
538 m_closeQueue.push(connectionID);
543 void SocketManager::Write(ConnectionID connectionID, const RawBuffer &rawBuffer) {
545 buffer.connectionID = connectionID;
546 buffer.rawBuffer = rawBuffer;
548 std::lock_guard<std::mutex> ulock(m_eventQueueMutex);
549 m_writeBufferQueue.push(buffer);
554 void SocketManager::NotifyMe() {
555 TEMP_FAILURE_RETRY(write(m_notifyMe[1], "You have message ;-)", 1));
558 void SocketManager::ProcessQueue() {
561 std::lock_guard<std::mutex> ulock(m_eventQueueMutex);
562 while (!m_writeBufferQueue.empty()) {
563 buffer = m_writeBufferQueue.front();
564 m_writeBufferQueue.pop();
566 auto &desc = m_socketDescriptionVector[buffer.connectionID.sock];
569 LogDebug("Received packet for write but connection is closed. Packet ignored!");
573 if (desc.counter != buffer.connectionID.counter)
575 LogDebug("Received packet for write but counter is broken. Packet ignored!");
580 buffer.rawBuffer.begin(),
581 buffer.rawBuffer.end(),
582 std::back_inserter(desc.rawBuffer));
584 FD_SET(buffer.connectionID.sock, &m_writeSet);
590 ConnectionID connection;
592 std::lock_guard<std::mutex> ulock(m_eventQueueMutex);
593 if (m_closeQueue.empty())
595 connection = m_closeQueue.front();
599 if (!m_socketDescriptionVector[connection.sock].isOpen)
602 if (connection.counter != m_socketDescriptionVector[connection.sock].counter)
605 CloseSocket(connection.sock);
609 void SocketManager::CloseSocket(int sock) {
610 // LogInfo("Closing socket: " << sock);
611 auto &desc = m_socketDescriptionVector[sock];
613 if (!(desc.isOpen)) {
614 // This may happend when some information was waiting for write to the
615 // socket and in the same time socket was closed by the client.
616 LogError("Socket " << sock << " is not open. Nothing to do!");
620 GenericSocketService::CloseEvent event;
621 event.connectionID.sock = sock;
622 event.connectionID.counter = desc.counter;
623 auto service = desc.service;
627 desc.interfaceID = -1;
628 desc.rawBuffer.clear();
631 service->Event(event);
633 LogError("Critical! Service is NULL! This should never happend!");
635 TEMP_FAILURE_RETRY(close(sock));
636 FD_CLR(sock, &m_readSet);
637 FD_CLR(sock, &m_writeSet);