4 void 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;
21 if (pktType == DINIT_CP_FINDSERVICE || pktType == DINIT_CP_LOADSERVICE) {
22 processFindLoad(pktType);
25 if (pktType == DINIT_CP_STARTSERVICE || pktType == DINIT_CP_STOPSERVICE
26 || pktType == DINIT_CP_WAKESERVICE || pktType == DINIT_CP_RELEASESERVICE) {
27 processStartStop(pktType);
30 else if (pktType == DINIT_CP_SHUTDOWN) {
32 if (rbuf.get_length() < 2) {
37 auto sd_type = static_cast<ShutdownType>(rbuf[1]);
39 service_set->stop_all_services(sd_type);
40 log_to_console = true;
41 char ackBuf[] = { DINIT_RP_ACK };
42 if (! queuePacket(ackBuf, 1)) return;
44 // Clear the packet from the buffer
50 // Unrecognized: give error response
51 char outbuf[] = { DINIT_RP_BADREQ };
52 if (! queuePacket(outbuf, 1)) return;
53 bad_conn_close = true;
54 ev_io_set(&iob, iob.fd, EV_WRITE);
59 void ControlConn::processFindLoad(int pktType)
63 constexpr int pkt_size = 4;
65 if (rbuf.get_length() < pkt_size) {
71 rbuf.extract((char *)&svcSize, 1, 2);
72 chklen = svcSize + 3; // packet type + (2 byte) length + service name
73 if (svcSize <= 0 || chklen > 1024) {
74 // Queue error response / mark connection bad
75 char badreqRep[] = { DINIT_RP_BADREQ };
76 if (! queuePacket(badreqRep, 1)) return;
77 bad_conn_close = true;
78 ev_io_set(&iob, iob.fd, EV_WRITE);
82 if (rbuf.get_length() < chklen) {
83 // packet not complete yet; read more
87 ServiceRecord * record = nullptr;
89 string serviceName = std::move(rbuf.extract_string(3, svcSize));
91 if (pktType == DINIT_CP_LOADSERVICE) {
94 record = service_set->loadService(serviceName);
96 catch (ServiceLoadExc &slexc) {
97 log(LogLevel::ERROR, "Could not load service ", slexc.serviceName, ": ", slexc.excDescription);
102 record = service_set->findService(serviceName.c_str());
105 if (record != nullptr) {
106 // Allocate a service handle
107 handle_t handle = allocateServiceHandle(record);
108 std::vector<char> rp_buf;
110 rp_buf.push_back(DINIT_RP_SERVICERECORD);
111 rp_buf.push_back(static_cast<char>(record->getState()));
112 for (int i = 0; i < (int) sizeof(handle); i++) {
113 rp_buf.push_back(*(((char *) &handle) + i));
115 rp_buf.push_back(static_cast<char>(record->getTargetState()));
116 if (! queuePacket(std::move(rp_buf))) return;
119 std::vector<char> rp_buf = { DINIT_RP_NOSERVICE };
120 if (! queuePacket(std::move(rp_buf))) return;
123 // Clear the packet from the buffer
124 rbuf.consume(chklen);
129 void ControlConn::processStartStop(int pktType)
133 constexpr int pkt_size = 2 + sizeof(handle_t);
135 if (rbuf.get_length() < pkt_size) {
140 // 1 byte: packet type
141 // 1 byte: pin in requested state (0 = no pin, 1 = pin)
142 // 4 bytes: service handle
144 bool do_pin = (rbuf[1] == 1);
146 rbuf.extract((char *) &handle, 2, sizeof(handle));
148 ServiceRecord *service = findServiceForKey(handle);
149 if (service == nullptr) {
150 // Service handle is bad
151 char badreqRep[] = { DINIT_RP_BADREQ };
152 if (! queuePacket(badreqRep, 1)) return;
153 bad_conn_close = true;
154 ev_io_set(&iob, iob.fd, EV_WRITE);
158 bool already_there = false;
160 case DINIT_CP_STARTSERVICE:
161 if (do_pin) service->pinStart();
163 already_there = service->getState() == ServiceState::STARTED;
165 case DINIT_CP_STOPSERVICE:
166 if (do_pin) service->pinStop();
168 already_there = service->getState() == ServiceState::STOPPED;
170 case DINIT_CP_WAKESERVICE:
171 // re-start a stopped service.
172 if (do_pin) service->pinStart();
173 service->start(false);
174 already_there = service->getState() == ServiceState::STARTED;
176 default: /* DINIT_CP_RELEASESERVICE */
177 // remove explicit start from a service, without necessarily stopping it.
182 char ack_buf[] = { (char)(already_there ? DINIT_RP_ALREADYSS : DINIT_RP_ACK) };
184 if (! queuePacket(ack_buf, 1)) return;
187 // Clear the packet from the buffer
188 rbuf.consume(pkt_size);
193 ControlConn::handle_t ControlConn::allocateServiceHandle(ServiceRecord *record)
195 bool is_unique = true;
196 handle_t largest_seen = 0;
197 handle_t candidate = 0;
198 for (auto p : keyServiceMap) {
199 if (p.first > largest_seen) largest_seen = p.first;
200 if (p.first == candidate) {
201 if (largest_seen == std::numeric_limits<handle_t>::max()) throw std::bad_alloc();
202 candidate = largest_seen + 1;
204 is_unique &= (p.second != record);
207 keyServiceMap[candidate] = record;
208 serviceKeyMap.insert(std::make_pair(record, candidate));
211 record->addListener(this);
218 bool ControlConn::queuePacket(const char *pkt, unsigned size) noexcept
220 if (bad_conn_close) return false;
222 bool was_empty = outbuf.empty();
225 int wr = write(iob.fd, pkt, size);
227 if (errno == EPIPE) {
231 if (errno != EAGAIN && errno != EWOULDBLOCK) {
238 if ((unsigned)wr == size) {
245 ev_io_set(&iob, iob.fd, EV_READ | EV_WRITE);
248 // Create a vector out of the (remaining part of the) packet:
250 outbuf.emplace_back(pkt, pkt + size);
253 catch (std::bad_alloc &baexc) {
254 // Mark the connection bad, and stop reading further requests
255 bad_conn_close = true;
258 // We can't send out-of-memory response as we already wrote as much as we
259 // could above. Neither can we later send the response since we have currently
260 // sent an incomplete packet. All we can do is close the connection.
264 ev_io_set(&iob, iob.fd, EV_WRITE);
271 bool ControlConn::queuePacket(std::vector<char> &&pkt) noexcept
273 if (bad_conn_close) return false;
275 bool was_empty = outbuf.empty();
279 // We can try sending the packet immediately:
280 int wr = write(iob.fd, pkt.data(), pkt.size());
282 if (errno == EPIPE) {
286 if (errno != EAGAIN && errno != EWOULDBLOCK) {
293 if ((unsigned)wr == pkt.size()) {
299 ev_io_set(&iob, iob.fd, EV_READ | EV_WRITE);
303 outbuf.emplace_back(pkt);
306 catch (std::bad_alloc &baexc) {
307 // Mark the connection bad, and stop reading further requests
308 bad_conn_close = true;
311 // We can't send out-of-memory response as we already wrote as much as we
312 // could above. Neither can we later send the response since we have currently
313 // sent an incomplete packet. All we can do is close the connection.
317 ev_io_set(&iob, iob.fd, EV_WRITE);
323 bool ControlConn::rollbackComplete() noexcept
325 char ackBuf[2] = { DINIT_ROLLBACK_COMPLETED, 2 };
326 return queuePacket(ackBuf, 2);
329 bool ControlConn::dataReady() noexcept
333 int r = rbuf.fill(fd);
335 // Note file descriptor is non-blocking
337 if (errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) {
351 if (rbuf.get_length() >= chklen) {
355 catch (std::bad_alloc &baexc) {
360 if (rbuf.get_length() == 1024) {
363 // TODO error response?
364 bad_conn_close = true;
365 ev_io_set(&iob, iob.fd, EV_WRITE);
371 void ControlConn::sendData() noexcept
373 if (outbuf.empty() && bad_conn_close) {
376 char oomBuf[] = { DINIT_RP_OOM };
377 write(iob.fd, oomBuf, 1);
383 vector<char> & pkt = outbuf.front();
384 char *data = pkt.data();
385 int written = write(iob.fd, data + outpkt_index, pkt.size() - outpkt_index);
387 if (errno == EPIPE) {
391 else if (errno == EAGAIN || errno == EWOULDBLOCK) {
392 // spurious readiness notification?
395 log(LogLevel::ERROR, "Error writing to control connection: ", strerror(errno));
401 outpkt_index += written;
402 if (outpkt_index == pkt.size()) {
403 // We've finished this packet, move on to the next:
406 if (outbuf.empty() && ! oom_close) {
407 if (! bad_conn_close) {
408 ev_io_set(&iob, iob.fd, EV_READ);
417 ControlConn::~ControlConn() noexcept
420 ev_io_stop(loop, &iob);
422 // Clear service listeners
423 for (auto p : serviceKeyMap) {
424 p.first->removeListener(this);
427 active_control_conns--;