4 bool ControlConn::processPacket()
8 // Note that where we call queuePacket, we must generally check the return value. If it
9 // returns false it has either deleted the connection or marked it for deletion; we
10 // shouldn't touch instance members after that point.
12 int pktType = rbuf[0];
13 if (pktType == DINIT_CP_QUERYVERSION) {
15 // DINIT_RP_CVERSION, (2 byte) minimum compatible version, (2 byte) maximum compatible version
16 char replyBuf[] = { DINIT_RP_CPVERSION, 0, 0, 0, 0 };
17 if (! queuePacket(replyBuf, 1)) return false;
21 if (pktType == DINIT_CP_FINDSERVICE || pktType == DINIT_CP_LOADSERVICE) {
22 return processFindLoad(pktType);
24 if (pktType == DINIT_CP_STARTSERVICE || pktType == DINIT_CP_STOPSERVICE
25 || pktType == DINIT_CP_WAKESERVICE || pktType == DINIT_CP_RELEASESERVICE) {
26 return processStartStop(pktType);
28 if (pktType == DINIT_CP_UNPINSERVICE) {
29 return processUnpinService();
31 if (pktType == DINIT_CP_SHUTDOWN) {
33 if (rbuf.get_length() < 2) {
38 auto sd_type = static_cast<ShutdownType>(rbuf[1]);
40 service_set->stop_all_services(sd_type);
41 char ackBuf[] = { DINIT_RP_ACK };
42 if (! queuePacket(ackBuf, 1)) return false;
44 // Clear the packet from the buffer
49 if (pktType == DINIT_CP_LISTSERVICES) {
50 return listServices();
53 // Unrecognized: give error response
54 char outbuf[] = { DINIT_RP_BADREQ };
55 if (! queuePacket(outbuf, 1)) return false;
56 bad_conn_close = true;
57 iob.setWatches(OUT_EVENTS);
62 bool ControlConn::processFindLoad(int pktType)
66 constexpr int pkt_size = 4;
68 if (rbuf.get_length() < pkt_size) {
74 rbuf.extract((char *)&svcSize, 1, 2);
75 chklen = svcSize + 3; // packet type + (2 byte) length + service name
76 if (svcSize <= 0 || chklen > 1024) {
77 // Queue error response / mark connection bad
78 char badreqRep[] = { DINIT_RP_BADREQ };
79 if (! queuePacket(badreqRep, 1)) return false;
80 bad_conn_close = true;
81 iob.setWatches(OUT_EVENTS);
85 if (rbuf.get_length() < chklen) {
86 // packet not complete yet; read more
90 ServiceRecord * record = nullptr;
92 string serviceName = rbuf.extract_string(3, svcSize);
94 if (pktType == DINIT_CP_LOADSERVICE) {
97 record = service_set->loadService(serviceName);
99 catch (ServiceLoadExc &slexc) {
100 log(LogLevel::ERROR, "Could not load service ", slexc.serviceName, ": ", slexc.excDescription);
105 record = service_set->findService(serviceName.c_str());
108 if (record != nullptr) {
109 // Allocate a service handle
110 handle_t handle = allocateServiceHandle(record);
111 std::vector<char> rp_buf;
113 rp_buf.push_back(DINIT_RP_SERVICERECORD);
114 rp_buf.push_back(static_cast<char>(record->getState()));
115 for (int i = 0; i < (int) sizeof(handle); i++) {
116 rp_buf.push_back(*(((char *) &handle) + i));
118 rp_buf.push_back(static_cast<char>(record->getTargetState()));
119 if (! queuePacket(std::move(rp_buf))) return false;
122 std::vector<char> rp_buf = { DINIT_RP_NOSERVICE };
123 if (! queuePacket(std::move(rp_buf))) return false;
126 // Clear the packet from the buffer
127 rbuf.consume(chklen);
132 bool ControlConn::processStartStop(int pktType)
136 constexpr int pkt_size = 2 + sizeof(handle_t);
138 if (rbuf.get_length() < pkt_size) {
143 // 1 byte: packet type
144 // 1 byte: pin in requested state (0 = no pin, 1 = pin)
145 // 4 bytes: service handle
147 bool do_pin = (rbuf[1] == 1);
149 rbuf.extract((char *) &handle, 2, sizeof(handle));
151 ServiceRecord *service = findServiceForKey(handle);
152 if (service == nullptr) {
153 // Service handle is bad
154 char badreqRep[] = { DINIT_RP_BADREQ };
155 if (! queuePacket(badreqRep, 1)) return false;
156 bad_conn_close = true;
157 iob.setWatches(OUT_EVENTS);
161 bool already_there = false;
164 case DINIT_CP_STARTSERVICE:
165 // start service, mark as required
166 if (do_pin) service->pinStart();
168 service_set->processQueues(true);
169 already_there = service->getState() == ServiceState::STARTED;
171 case DINIT_CP_STOPSERVICE:
172 // force service to stop
173 if (do_pin) service->pinStop();
175 service->forceStop();
176 service_set->processQueues(false);
177 already_there = service->getState() == ServiceState::STOPPED;
179 case DINIT_CP_WAKESERVICE:
180 // re-start a stopped service (do not mark as required)
181 if (do_pin) service->pinStart();
182 service->start(false);
183 service_set->processQueues(true);
184 already_there = service->getState() == ServiceState::STARTED;
186 case DINIT_CP_RELEASESERVICE:
187 // remove required mark, stop if not required by dependents
188 if (do_pin) service->pinStop();
189 service->stop(false);
190 service_set->processQueues(false);
191 already_there = service->getState() == ServiceState::STOPPED;
195 char ack_buf[] = { (char)(already_there ? DINIT_RP_ALREADYSS : DINIT_RP_ACK) };
197 if (! queuePacket(ack_buf, 1)) return false;
200 // Clear the packet from the buffer
201 rbuf.consume(pkt_size);
206 bool ControlConn::processUnpinService()
210 constexpr int pkt_size = 1 + sizeof(handle_t);
212 if (rbuf.get_length() < pkt_size) {
217 // 1 byte: packet type
218 // 4 bytes: service handle
221 rbuf.extract((char *) &handle, 1, sizeof(handle));
223 ServiceRecord *service = findServiceForKey(handle);
224 if (service == nullptr) {
225 // Service handle is bad
226 char badreqRep[] = { DINIT_RP_BADREQ };
227 if (! queuePacket(badreqRep, 1)) return false;
228 bad_conn_close = true;
229 iob.setWatches(OUT_EVENTS);
234 service_set->processQueues(true);
235 char ack_buf[] = { (char) DINIT_RP_ACK };
236 if (! queuePacket(ack_buf, 1)) return false;
239 // Clear the packet from the buffer
240 rbuf.consume(pkt_size);
245 bool ControlConn::listServices()
247 rbuf.consume(1); // clear request packet
251 auto slist = service_set->listServices();
252 for (auto sptr : slist) {
253 std::vector<char> pkt_buf;
255 const std::string &name = sptr->getServiceName();
256 int nameLen = std::min((size_t)256, name.length());
257 pkt_buf.resize(8 + nameLen);
259 pkt_buf[0] = DINIT_RP_SVCINFO;
260 pkt_buf[1] = nameLen;
261 pkt_buf[2] = static_cast<char>(sptr->getState());
262 pkt_buf[3] = static_cast<char>(sptr->getTargetState());
264 pkt_buf[4] = 0; // reserved
269 for (int i = 0; i < nameLen; i++) {
270 pkt_buf[8+i] = name[i];
273 if (! queuePacket(std::move(pkt_buf))) return false;
276 char ack_buf[] = { (char) DINIT_RP_LISTDONE };
277 if (! queuePacket(ack_buf, 1)) return false;
281 catch (std::bad_alloc &exc)
288 ControlConn::handle_t ControlConn::allocateServiceHandle(ServiceRecord *record)
290 bool is_unique = true;
291 handle_t largest_seen = 0;
292 handle_t candidate = 0;
293 for (auto p : keyServiceMap) {
294 if (p.first > largest_seen) largest_seen = p.first;
295 if (p.first == candidate) {
296 if (largest_seen == std::numeric_limits<handle_t>::max()) throw std::bad_alloc();
297 candidate = largest_seen + 1;
299 is_unique &= (p.second != record);
302 keyServiceMap[candidate] = record;
303 serviceKeyMap.insert(std::make_pair(record, candidate));
306 record->addListener(this);
313 bool ControlConn::queuePacket(const char *pkt, unsigned size) noexcept
315 int in_flag = bad_conn_close ? 0 : IN_EVENTS;
316 bool was_empty = outbuf.empty();
318 // If the queue is empty, we can try to write the packet out now rather than queueing it.
319 // If the write is unsuccessful or partial, we queue the remainder.
321 int wr = write(iob.getWatchedFd(), pkt, size);
323 if (errno == EPIPE) {
326 if (errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) {
327 log(LogLevel::WARN, "Error writing to control connection: ", strerror(errno));
330 // EAGAIN etc: fall through to below
333 if ((unsigned)wr == size) {
335 iob.setWatches(in_flag);
343 // Create a vector out of the (remaining part of the) packet:
345 outbuf.emplace_back(pkt, pkt + size);
346 iob.setWatches(in_flag | OUT_EVENTS);
349 catch (std::bad_alloc &baexc) {
350 // Mark the connection bad, and stop reading further requests
351 bad_conn_close = true;
354 // We can't send out-of-memory response as we already wrote as much as we
355 // could above. Neither can we later send the response since we have currently
356 // sent an incomplete packet. All we can do is close the connection.
360 iob.setWatches(OUT_EVENTS);
366 // This queuePacket method is frustratingly similar to the one above, but the subtle differences
367 // make them extraordinary difficult to combine into a single method.
368 bool ControlConn::queuePacket(std::vector<char> &&pkt) noexcept
370 int in_flag = bad_conn_close ? 0 : IN_EVENTS;
371 bool was_empty = outbuf.empty();
375 // We can try sending the packet immediately:
376 int wr = write(iob.getWatchedFd(), pkt.data(), pkt.size());
378 if (errno == EPIPE) {
381 if (errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) {
382 log(LogLevel::WARN, "Error writing to control connection: ", strerror(errno));
385 // EAGAIN etc: fall through to below
388 if ((unsigned)wr == pkt.size()) {
390 iob.setWatches(in_flag);
398 outbuf.emplace_back(pkt);
399 iob.setWatches(in_flag | OUT_EVENTS);
402 catch (std::bad_alloc &baexc) {
403 // Mark the connection bad, and stop reading further requests
404 bad_conn_close = true;
407 // We can't send out-of-memory response as we already wrote as much as we
408 // could above. Neither can we later send the response since we have currently
409 // sent an incomplete packet. All we can do is close the connection.
413 iob.setWatches(OUT_EVENTS);
419 bool ControlConn::rollbackComplete() noexcept
421 char ackBuf[2] = { DINIT_ROLLBACK_COMPLETED, 2 };
422 return queuePacket(ackBuf, 2);
425 bool ControlConn::dataReady() noexcept
427 int fd = iob.getWatchedFd();
429 int r = rbuf.fill(fd);
431 // Note file descriptor is non-blocking
433 if (errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) {
434 log(LogLevel::WARN, "Error writing to control connection: ", strerror(errno));
445 if (rbuf.get_length() >= chklen) {
447 return !processPacket();
449 catch (std::bad_alloc &baexc) {
454 else if (rbuf.get_length() == 1024) {
456 log(LogLevel::WARN, "Received too-large control package; dropping connection");
457 bad_conn_close = true;
458 iob.setWatches(OUT_EVENTS);
461 int out_flags = (bad_conn_close || !outbuf.empty()) ? OUT_EVENTS : 0;
462 iob.setWatches(IN_EVENTS | out_flags);
468 bool ControlConn::sendData() noexcept
470 if (outbuf.empty() && bad_conn_close) {
473 char oomBuf[] = { DINIT_RP_OOM };
474 write(iob.getWatchedFd(), oomBuf, 1);
479 vector<char> & pkt = outbuf.front();
480 char *data = pkt.data();
481 int written = write(iob.getWatchedFd(), data + outpkt_index, pkt.size() - outpkt_index);
483 if (errno == EPIPE) {
487 else if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {
488 // spurious readiness notification?
491 log(LogLevel::ERROR, "Error writing to control connection: ", strerror(errno));
497 outpkt_index += written;
498 if (outpkt_index == pkt.size()) {
499 // We've finished this packet, move on to the next:
502 if (outbuf.empty() && ! oom_close) {
503 if (! bad_conn_close) {
504 iob.setWatches(IN_EVENTS);
515 ControlConn::~ControlConn() noexcept
517 close(iob.getWatchedFd());
518 iob.deregister(*loop);
520 // Clear service listeners
521 for (auto p : serviceKeyMap) {
522 p.first->removeListener(this);
525 active_control_conns--;