6 #include <system_error>
9 #include <sys/socket.h>
14 #include "control-cmds.h"
15 #include "service-constants.h"
18 // dinitctl: utility to control the Dinit daemon, including starting and stopping of services.
20 // This utility communicates with the dinit daemon via a unix socket (/dev/initctl).
22 using handle_t = uint32_t;
29 ReadCPException(int err) : errcode(err) { }
32 static void fillBufferTo(CPBuffer *buf, int fd, int rlength)
34 int r = buf->fillTo(fd, rlength);
36 throw ReadCPException(errno);
39 throw ReadCPException(0);
43 static const char * describeState(bool stopped)
45 return stopped ? "stopped" : "started";
48 static const char * describeVerb(bool stop)
50 return stop ? "stop" : "start";
53 // Wait for a reply packet, skipping over any information packets
54 // that are received in the meantime.
55 static void wait_for_reply(CPBuffer &rbuffer, int fd)
57 fillBufferTo(&rbuffer, fd, 1);
59 while (rbuffer[0] >= 100) {
60 // Information packet; discard.
61 fillBufferTo(&rbuffer, fd, 1);
62 int pktlen = (unsigned char) rbuffer[1];
64 rbuffer.consume(1); // Consume one byte so we'll read one byte of the next packet
65 fillBufferTo(&rbuffer, fd, pktlen);
66 rbuffer.consume(pktlen - 1);
71 // Write *all* the requested buffer and re-try if necessary until
72 // the buffer is written or an unrecoverable error occurs.
73 static int write_all(int fd, const void *buf, size_t count)
75 const char *cbuf = static_cast<const char *>(buf);
78 int r = write(fd, cbuf, count);
80 if (errno == EINTR) continue;
91 int main(int argc, char **argv)
96 bool show_help = argc < 2;
97 char *service_name = nullptr;
99 std::string control_socket_str;
100 const char * control_socket_path = nullptr;
103 bool sys_dinit = false; // communicate with system daemon
104 bool wait_for_service = true;
109 constexpr int START_SERVICE = 1;
110 constexpr int STOP_SERVICE = 2;
112 for (int i = 1; i < argc; i++) {
113 if (argv[i][0] == '-') {
114 if (strcmp(argv[i], "--help") == 0) {
118 else if (strcmp(argv[i], "--no-wait") == 0) {
119 wait_for_service = false;
121 else if (strcmp(argv[i], "--quiet") == 0) {
124 else if (strcmp(argv[i], "--system") == 0 || strcmp(argv[i], "-s") == 0) {
127 else if (strcmp(argv[i], "--pin") == 0) {
131 cerr << "Unrecognized command-line parameter: " << argv[i] << endl;
135 else if (command == 0) {
136 if (strcmp(argv[i], "start") == 0) {
137 command = START_SERVICE;
139 else if (strcmp(argv[i], "stop") == 0) {
140 command = STOP_SERVICE;
149 service_name = argv[i];
150 // TODO support multiple services (or at least give error if multiple
151 // services supplied)
155 if (service_name == nullptr || command == 0) {
160 cout << "dinitctl: control Dinit services" << endl;
162 cout << "\nUsage:" << endl;
163 cout << " dinitctl [options] start [options] <service-name> : start and activate service" << endl;
164 cout << " dinitctl [options] stop [options] <service-name> : stop service and cancel explicit activation" << endl;
166 // cout << " dinitctl [options] wake <service-name> : start but don't activate service" << endl;
168 cout << "\nNote: An activated service keeps its dependencies running when possible." << endl;
170 cout << "\nGeneral options:" << endl;
171 cout << " -s, --system : control system daemon instead of user daemon" << endl;
172 cout << " --quiet : suppress output (except errors)" << endl;
174 cout << "\nCommand options:" << endl;
175 cout << " --help : show this help" << endl;
176 cout << " --no-wait : don't wait for service startup/shutdown to complete" << endl;
177 cout << " --pin : pin the service in the requested (started/stopped) state" << endl;
181 do_stop = (command == STOP_SERVICE);
183 control_socket_path = "/dev/dinitctl";
186 char * userhome = getenv("HOME");
187 if (userhome == nullptr) {
188 struct passwd * pwuid_p = getpwuid(getuid());
189 if (pwuid_p != nullptr) {
190 userhome = pwuid_p->pw_dir;
194 if (userhome != nullptr) {
195 control_socket_str = userhome;
196 control_socket_str += "/.dinitctl";
197 control_socket_path = control_socket_str.c_str();
200 cerr << "Cannot locate user home directory (set HOME or check /etc/passwd file)" << endl;
205 int socknum = socket(AF_UNIX, SOCK_STREAM, 0);
211 struct sockaddr_un * name;
212 uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + strlen(control_socket_path) + 1;
213 name = (struct sockaddr_un *) malloc(sockaddr_size);
214 if (name == nullptr) {
215 cerr << "dinit-start: out of memory" << endl;
219 name->sun_family = AF_UNIX;
220 strcpy(name->sun_path, control_socket_path);
222 int connr = connect(socknum, (struct sockaddr *) name, sockaddr_size);
228 // TODO should start by querying protocol version
231 uint16_t sname_len = strlen(service_name);
232 int bufsize = 3 + sname_len;
233 char * buf = new char[bufsize];
235 buf[0] = DINIT_CP_LOADSERVICE;
236 memcpy(buf + 1, &sname_len, 2);
237 memcpy(buf + 3, service_name, sname_len);
239 int r = write_all(socknum, buf, bufsize);
246 // Now we expect a reply:
250 wait_for_reply(rbuffer, socknum);
252 //ServiceState state;
253 //ServiceState target_state;
256 if (rbuffer[0] == DINIT_RP_SERVICERECORD) {
257 fillBufferTo(&rbuffer, socknum, 2 + sizeof(handle));
258 rbuffer.extract((char *) &handle, 2, sizeof(handle));
259 //state = static_cast<ServiceState>(rbuffer[1]);
260 //target_state = static_cast<ServiceState>(rbuffer[2 + sizeof(handle)]);
261 rbuffer.consume(3 + sizeof(handle));
263 else if (rbuffer[0] == DINIT_RP_NOSERVICE) {
264 cerr << "Failed to find/load service." << endl;
268 cerr << "Protocol error." << endl;
272 // ServiceState wanted_state = do_stop ? ServiceState::STOPPED : ServiceState::STARTED;
273 int command = do_stop ? DINIT_CP_STOPSERVICE : DINIT_CP_STARTSERVICE;
275 // Need to issue STOPSERVICE/STARTSERVICE
276 // We'll do this regardless of the current service state / target state, since issuing
277 // start/stop also sets or clears the "explicitly started" flag on the service.
278 //if (target_state != wanted_state) {
280 buf = new char[2 + sizeof(handle)];
282 buf[1] = do_pin ? 1 : 0;
283 memcpy(buf + 2, &handle, sizeof(handle));
284 r = write_all(socknum, buf, 2 + sizeof(handle));
292 wait_for_reply(rbuffer, socknum);
293 if (rbuffer[0] == DINIT_RP_ALREADYSS) {
295 cout << "Service already " << describeState(do_stop) << "." << endl;
297 return 0; // success!
299 if (rbuffer[0] != DINIT_RP_ACK) {
300 cerr << "Protocol error." << endl;
307 if (state == wanted_state) {
309 cout << "Service already " << describeState(do_stop) << "." << endl;
311 return 0; // success!
315 if (! wait_for_service) {
317 cout << "Issued " << describeVerb(do_stop) << " command successfully." << endl;
322 ServiceEvent completionEvent;
323 ServiceEvent cancelledEvent;
326 completionEvent = ServiceEvent::STOPPED;
327 cancelledEvent = ServiceEvent::STOPCANCELLED;
330 completionEvent = ServiceEvent::STARTED;
331 cancelledEvent = ServiceEvent::STARTCANCELLED;
334 // Wait until service started:
335 r = rbuffer.fillTo(socknum, 2);
337 if (rbuffer[0] >= 100) {
338 int pktlen = (unsigned char) rbuffer[1];
339 fillBufferTo(&rbuffer, socknum, pktlen);
341 if (rbuffer[0] == DINIT_IP_SERVICEEVENT) {
343 rbuffer.extract((char *) &ev_handle, 2, sizeof(ev_handle));
344 ServiceEvent event = static_cast<ServiceEvent>(rbuffer[2 + sizeof(ev_handle)]);
345 if (ev_handle == handle) {
346 if (event == completionEvent) {
348 cout << "Service " << describeState(do_stop) << "." << endl;
352 else if (event == cancelledEvent) {
354 cout << "Service " << describeVerb(do_stop) << " cancelled." << endl;
358 else if (! do_stop && event == ServiceEvent::FAILEDSTART) {
360 cout << "Service failed to start." << endl;
367 rbuffer.consume(pktlen);
368 r = rbuffer.fillTo(socknum, 2);
371 // Not an information packet?
372 cerr << "protocol error" << endl;
381 cerr << "protocol error (connection closed by server)" << endl;
385 catch (ReadCPException &exc) {
386 cerr << "control socket read failure or protocol error" << endl;
389 catch (std::bad_alloc &exc) {
390 cerr << "out of memory" << endl;