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 // Write *all* the requested buffer and re-try if necessary until
54 // the buffer is written or an unrecoverable error occurs.
55 static int write_all(int fd, const void *buf, size_t count)
57 const char *cbuf = static_cast<const char *>(buf);
60 int r = write(fd, cbuf, count);
62 if (errno == EINTR) continue;
72 int main(int argc, char **argv)
77 bool show_help = argc < 2;
78 char *service_name = nullptr;
80 std::string control_socket_str;
81 const char * control_socket_path = nullptr;
84 bool sys_dinit = false; // communicate with system daemon
85 bool wait_for_service = true;
89 constexpr int START_SERVICE = 1;
90 constexpr int STOP_SERVICE = 2;
92 for (int i = 1; i < argc; i++) {
93 if (argv[i][0] == '-') {
94 if (strcmp(argv[i], "--help") == 0) {
98 else if (strcmp(argv[i], "--no-wait") == 0) {
99 wait_for_service = false;
101 else if (strcmp(argv[i], "--quiet") == 0) {
104 else if (strcmp(argv[i], "--system") == 0 || strcmp(argv[i], "-s") == 0) {
108 cerr << "Unrecognized command-line parameter: " << argv[i] << endl;
112 else if (command == 0) {
113 if (strcmp(argv[i], "start") == 0) {
114 command = START_SERVICE;
116 else if (strcmp(argv[i], "stop") == 0) {
117 command = STOP_SERVICE;
126 service_name = argv[i];
127 // TODO support multiple services (or at least give error if multiple
128 // services supplied)
132 if (service_name == nullptr || command == 0) {
137 cout << "dinit-start: start a dinit service" << endl;
138 cout << " --help : show this help" << endl;
139 cout << " --no-wait : don't wait for service startup/shutdown to complete" << endl;
140 cout << " --quiet : suppress output (except errors)" << endl;
141 cout << " -s, --system : control system daemon instead of user daemon" << endl;
142 cout << " <service-name> : start the named service" << endl;
146 do_stop = (command == STOP_SERVICE);
148 control_socket_path = "/dev/dinitctl";
151 char * userhome = getenv("HOME");
152 if (userhome == nullptr) {
153 struct passwd * pwuid_p = getpwuid(getuid());
154 if (pwuid_p != nullptr) {
155 userhome = pwuid_p->pw_dir;
159 if (userhome != nullptr) {
160 control_socket_str = userhome;
161 control_socket_str += "/.dinitctl";
162 control_socket_path = control_socket_str.c_str();
165 cerr << "Cannot locate user home directory (set HOME or check /etc/passwd file)" << endl;
170 int socknum = socket(AF_UNIX, SOCK_STREAM, 0);
176 struct sockaddr_un * name;
177 uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + strlen(control_socket_path) + 1;
178 name = (struct sockaddr_un *) malloc(sockaddr_size);
179 if (name == nullptr) {
180 cerr << "dinit-start: out of memory" << endl;
184 name->sun_family = AF_UNIX;
185 strcpy(name->sun_path, control_socket_path);
187 int connr = connect(socknum, (struct sockaddr *) name, sockaddr_size);
193 // TODO should start by querying protocol version
196 uint16_t sname_len = strlen(service_name);
197 int bufsize = 3 + sname_len;
198 char * buf = new char[bufsize];
200 buf[0] = DINIT_CP_LOADSERVICE;
201 memcpy(buf + 1, &sname_len, 2);
202 memcpy(buf + 3, service_name, sname_len);
204 int r = write_all(socknum, buf, bufsize);
211 // Now we expect a reply:
212 // NOTE: should skip over information packets.
216 fillBufferTo(&rbuffer, socknum, 1);
219 ServiceState target_state;
222 if (rbuffer[0] == DINIT_RP_SERVICERECORD) {
223 fillBufferTo(&rbuffer, socknum, 2 + sizeof(handle));
224 rbuffer.extract((char *) &handle, 2, sizeof(handle));
225 state = static_cast<ServiceState>(rbuffer[1]);
226 target_state = static_cast<ServiceState>(rbuffer[2 + sizeof(handle)]);
227 rbuffer.consume(3 + sizeof(handle));
229 else if (rbuffer[0] == DINIT_RP_NOSERVICE) {
230 cerr << "Failed to find/load service." << endl;
234 cerr << "Protocol error." << endl;
238 ServiceState wanted_state = do_stop ? ServiceState::STOPPED : ServiceState::STARTED;
239 int command = do_stop ? DINIT_CP_STOPSERVICE : DINIT_CP_STARTSERVICE;
241 // Need to issue STOPSERVICE/STARTSERVICE
242 if (target_state != wanted_state) {
243 buf = new char[2 + sizeof(handle)];
245 buf[1] = 0; // don't pin
246 memcpy(buf + 2, &handle, sizeof(handle));
247 r = write(socknum, buf, 2 + sizeof(handle));
251 if (state == wanted_state) {
253 cout << "Service already " << describeState(do_stop) << "." << endl;
255 return 0; // success!
258 if (! wait_for_service) {
262 ServiceEvent completionEvent;
263 ServiceEvent cancelledEvent;
266 completionEvent = ServiceEvent::STOPPED;
267 cancelledEvent = ServiceEvent::STOPCANCELLED;
270 completionEvent = ServiceEvent::STARTED;
271 cancelledEvent = ServiceEvent::STARTCANCELLED;
274 // Wait until service started:
275 r = rbuffer.fillTo(socknum, 2);
277 if (rbuffer[0] >= 100) {
278 int pktlen = (unsigned char) rbuffer[1];
279 fillBufferTo(&rbuffer, socknum, pktlen);
281 if (rbuffer[0] == DINIT_IP_SERVICEEVENT) {
283 rbuffer.extract((char *) &ev_handle, 2, sizeof(ev_handle));
284 ServiceEvent event = static_cast<ServiceEvent>(rbuffer[2 + sizeof(ev_handle)]);
285 if (ev_handle == handle) {
286 if (event == completionEvent) {
288 cout << "Service " << describeState(do_stop) << "." << endl;
292 else if (event == cancelledEvent) {
294 cout << "Service " << describeVerb(do_stop) << " cancelled." << endl;
298 else if (! do_stop && event == ServiceEvent::FAILEDSTART) {
300 cout << "Service failed to start." << endl;
308 // Not an information packet?
309 cerr << "protocol error" << endl;
318 cerr << "protocol error (connection closed by server)" << endl;
322 catch (ReadCPException &exc) {
323 cerr << "control socket read failure or protocol error" << endl;
326 catch (std::bad_alloc &exc) {
327 cerr << "out of memory" << endl;