1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <arpa/inet.h>
18 #include <dirent.h>
19 #include <errno.h>
20 #include <linux/if.h>
21 #include <netdb.h>
22 #include <netinet/in.h>
23 #include <pthread.h>
24 #include <stdlib.h>
25 #include <sys/poll.h>
26 #include <sys/socket.h>
27 #include <sys/types.h>
28 #include <string.h>
29
30 #define LOG_TAG "MDnsDS"
31 #define DBG 1
32 #define VDBG 1
33
34 #include <cutils/log.h>
35 #include <cutils/properties.h>
36 #include <sysutils/SocketClient.h>
37
38 #include "MDnsSdListener.h"
39 #include "ResponseCode.h"
40
41 #define MDNS_SERVICE_NAME "mdnsd"
42 #define MDNS_SERVICE_STATUS "init.svc.mdnsd"
43
MDnsSdListener()44 MDnsSdListener::MDnsSdListener() :
45 FrameworkListener("mdns", true) {
46 Monitor *m = new Monitor();
47 registerCmd(new Handler(m, this));
48 }
49
Handler(Monitor * m,MDnsSdListener * listener)50 MDnsSdListener::Handler::Handler(Monitor *m, MDnsSdListener *listener) :
51 NetdCommand("mdnssd") {
52 if (DBG) ALOGD("MDnsSdListener::Hander starting up");
53 mMonitor = m;
54 mListener = listener;
55 }
56
~Handler()57 MDnsSdListener::Handler::~Handler() {}
58
discover(SocketClient * cli,const char * iface,const char * regType,const char * domain,const int requestId,const int requestFlags)59 void MDnsSdListener::Handler::discover(SocketClient *cli,
60 const char *iface,
61 const char *regType,
62 const char *domain,
63 const int requestId,
64 const int requestFlags) {
65 if (VDBG) {
66 ALOGD("discover(%s, %s, %s, %d, %d)", iface, regType, domain, requestId,
67 requestFlags);
68 }
69 Context *context = new Context(requestId, mListener);
70 DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
71 if (ref == NULL) {
72 ALOGE("requestId %d already in use during discover call", requestId);
73 cli->sendMsg(ResponseCode::CommandParameterError,
74 "RequestId already in use during discover call", false);
75 return;
76 }
77 if (VDBG) ALOGD("using ref %p", ref);
78 DNSServiceFlags nativeFlags = iToFlags(requestFlags);
79 int interfaceInt = ifaceNameToI(iface);
80
81 DNSServiceErrorType result = DNSServiceBrowse(ref, nativeFlags, interfaceInt, regType,
82 domain, &MDnsSdListenerDiscoverCallback, context);
83 if (result != kDNSServiceErr_NoError) {
84 ALOGE("Discover request %d got an error from DNSServiceBrowse %d", requestId, result);
85 mMonitor->freeServiceRef(requestId);
86 cli->sendMsg(ResponseCode::CommandParameterError,
87 "Discover request got an error from DNSServiceBrowse", false);
88 return;
89 }
90 mMonitor->startMonitoring(requestId);
91 if (VDBG) ALOGD("discover successful");
92 cli->sendMsg(ResponseCode::CommandOkay, "Discover operation started", false);
93 return;
94 }
95
MDnsSdListenerDiscoverCallback(DNSServiceRef sdRef,DNSServiceFlags flags,uint32_t interfaceIndex,DNSServiceErrorType errorCode,const char * serviceName,const char * regType,const char * replyDomain,void * inContext)96 void MDnsSdListenerDiscoverCallback(DNSServiceRef sdRef, DNSServiceFlags flags,
97 uint32_t interfaceIndex, DNSServiceErrorType errorCode, const char *serviceName,
98 const char *regType, const char *replyDomain, void *inContext) {
99 MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
100 char *msg;
101 int refNumber = context->mRefNumber;
102
103 if (errorCode != kDNSServiceErr_NoError) {
104 asprintf(&msg, "%d %d", refNumber, errorCode);
105 context->mListener->sendBroadcast(ResponseCode::ServiceDiscoveryFailed, msg, false);
106 if (DBG) ALOGE("discover failure for %d, error= %d", refNumber, errorCode);
107 } else {
108 int respCode;
109 char *quotedServiceName = SocketClient::quoteArg(serviceName);
110 if (flags & kDNSServiceFlagsAdd) {
111 if (VDBG) {
112 ALOGD("Discover found new serviceName %s, regType %s and domain %s for %d",
113 serviceName, regType, replyDomain, refNumber);
114 }
115 respCode = ResponseCode::ServiceDiscoveryServiceAdded;
116 } else {
117 if (VDBG) {
118 ALOGD("Discover lost serviceName %s, regType %s and domain %s for %d",
119 serviceName, regType, replyDomain, refNumber);
120 }
121 respCode = ResponseCode::ServiceDiscoveryServiceRemoved;
122 }
123 asprintf(&msg, "%d %s %s %s", refNumber, quotedServiceName, regType, replyDomain);
124 free(quotedServiceName);
125 context->mListener->sendBroadcast(respCode, msg, false);
126 }
127 free(msg);
128 }
129
stop(SocketClient * cli,int argc,char ** argv,const char * str)130 void MDnsSdListener::Handler::stop(SocketClient *cli, int argc, char **argv, const char *str) {
131 if (argc != 3) {
132 char *msg;
133 asprintf(&msg, "Invalid number of arguments to %s", str);
134 cli->sendMsg(ResponseCode::CommandParameterError, msg, false);
135 free(msg);
136 return;
137 }
138 int requestId = atoi(argv[2]);
139 DNSServiceRef *ref = mMonitor->lookupServiceRef(requestId);
140 if (ref == NULL) {
141 if (DBG) ALOGE("%s stop used unknown requestId %d", str, requestId);
142 cli->sendMsg(ResponseCode::CommandParameterError, "Unknown requestId", false);
143 return;
144 }
145 if (VDBG) ALOGD("Stopping %s with ref %p", str, ref);
146 DNSServiceRefDeallocate(*ref);
147 mMonitor->freeServiceRef(requestId);
148 char *msg;
149 asprintf(&msg, "%s stopped", str);
150 cli->sendMsg(ResponseCode::CommandOkay, msg, false);
151 free(msg);
152 }
153
serviceRegister(SocketClient * cli,int requestId,const char * interfaceName,const char * serviceName,const char * serviceType,const char * domain,const char * host,int port,int txtLen,void * txtRecord)154 void MDnsSdListener::Handler::serviceRegister(SocketClient *cli, int requestId,
155 const char *interfaceName, const char *serviceName, const char *serviceType,
156 const char *domain, const char *host, int port, int txtLen, void *txtRecord) {
157 if (VDBG) {
158 ALOGD("serviceRegister(%d, %s, %s, %s, %s, %s, %d, %d, <binary>)", requestId,
159 interfaceName, serviceName, serviceType, domain, host, port, txtLen);
160 }
161 Context *context = new Context(requestId, mListener);
162 DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
163 port = htons(port);
164 if (ref == NULL) {
165 ALOGE("requestId %d already in use during register call", requestId);
166 cli->sendMsg(ResponseCode::CommandParameterError,
167 "RequestId already in use during register call", false);
168 return;
169 }
170 DNSServiceFlags nativeFlags = 0;
171 int interfaceInt = ifaceNameToI(interfaceName);
172 DNSServiceErrorType result = DNSServiceRegister(ref, interfaceInt, nativeFlags, serviceName,
173 serviceType, domain, host, port, txtLen, txtRecord, &MDnsSdListenerRegisterCallback,
174 context);
175 if (result != kDNSServiceErr_NoError) {
176 ALOGE("service register request %d got an error from DNSServiceRegister %d", requestId,
177 result);
178 mMonitor->freeServiceRef(requestId);
179 cli->sendMsg(ResponseCode::CommandParameterError,
180 "serviceRegister request got an error from DNSServiceRegister", false);
181 return;
182 }
183 mMonitor->startMonitoring(requestId);
184 if (VDBG) ALOGD("serviceRegister successful");
185 cli->sendMsg(ResponseCode::CommandOkay, "serviceRegister started", false);
186 return;
187 }
188
MDnsSdListenerRegisterCallback(DNSServiceRef sdRef,DNSServiceFlags flags,DNSServiceErrorType errorCode,const char * serviceName,const char * regType,const char * domain,void * inContext)189 void MDnsSdListenerRegisterCallback(DNSServiceRef sdRef, DNSServiceFlags flags,
190 DNSServiceErrorType errorCode, const char *serviceName, const char *regType,
191 const char *domain, void *inContext) {
192 MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
193 char *msg;
194 int refNumber = context->mRefNumber;
195 if (errorCode != kDNSServiceErr_NoError) {
196 asprintf(&msg, "%d %d", refNumber, errorCode);
197 context->mListener->sendBroadcast(ResponseCode::ServiceRegistrationFailed, msg, false);
198 if (DBG) ALOGE("register failure for %d, error= %d", refNumber, errorCode);
199 } else {
200 char *quotedServiceName = SocketClient::quoteArg(serviceName);
201 asprintf(&msg, "%d %s", refNumber, quotedServiceName);
202 free(quotedServiceName);
203 context->mListener->sendBroadcast(ResponseCode::ServiceRegistrationSucceeded, msg, false);
204 if (VDBG) ALOGD("register succeeded for %d as %s", refNumber, serviceName);
205 }
206 free(msg);
207 }
208
209
resolveService(SocketClient * cli,int requestId,const char * interfaceName,const char * serviceName,const char * regType,const char * domain)210 void MDnsSdListener::Handler::resolveService(SocketClient *cli, int requestId,
211 const char *interfaceName, const char *serviceName, const char *regType,
212 const char *domain) {
213 if (VDBG) {
214 ALOGD("resolveService(%d, %s, %s, %s, %s)", requestId, interfaceName,
215 serviceName, regType, domain);
216 }
217 Context *context = new Context(requestId, mListener);
218 DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
219 if (ref == NULL) {
220 ALOGE("request Id %d already in use during resolve call", requestId);
221 cli->sendMsg(ResponseCode::CommandParameterError,
222 "RequestId already in use during resolve call", false);
223 return;
224 }
225 DNSServiceFlags nativeFlags = 0;
226 int interfaceInt = ifaceNameToI(interfaceName);
227 DNSServiceErrorType result = DNSServiceResolve(ref, nativeFlags, interfaceInt, serviceName,
228 regType, domain, &MDnsSdListenerResolveCallback, context);
229 if (result != kDNSServiceErr_NoError) {
230 ALOGE("service resolve request %d got an error from DNSServiceResolve %d", requestId,
231 result);
232 mMonitor->freeServiceRef(requestId);
233 cli->sendMsg(ResponseCode::CommandParameterError,
234 "resolveService got an error from DNSServiceResolve", false);
235 return;
236 }
237 mMonitor->startMonitoring(requestId);
238 if (VDBG) ALOGD("resolveService successful");
239 cli->sendMsg(ResponseCode::CommandOkay, "resolveService started", false);
240 return;
241 }
242
MDnsSdListenerResolveCallback(DNSServiceRef sdRef,DNSServiceFlags flags,uint32_t interface,DNSServiceErrorType errorCode,const char * fullname,const char * hosttarget,uint16_t port,uint16_t txtLen,const unsigned char * txtRecord,void * inContext)243 void MDnsSdListenerResolveCallback(DNSServiceRef sdRef, DNSServiceFlags flags, uint32_t interface,
244 DNSServiceErrorType errorCode, const char *fullname, const char *hosttarget, uint16_t port,
245 uint16_t txtLen, const unsigned char *txtRecord, void *inContext) {
246 MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
247 char *msg;
248 int refNumber = context->mRefNumber;
249 port = ntohs(port);
250 if (errorCode != kDNSServiceErr_NoError) {
251 asprintf(&msg, "%d %d", refNumber, errorCode);
252 context->mListener->sendBroadcast(ResponseCode::ServiceResolveFailed, msg, false);
253 if (DBG) ALOGE("resolve failure for %d, error= %d", refNumber, errorCode);
254 } else {
255 char *quotedFullName = SocketClient::quoteArg(fullname);
256 char *quotedHostTarget = SocketClient::quoteArg(hosttarget);
257 asprintf(&msg, "%d %s %s %d %d", refNumber, quotedFullName, quotedHostTarget, port, txtLen);
258 free(quotedFullName);
259 free(quotedHostTarget);
260 context->mListener->sendBroadcast(ResponseCode::ServiceResolveSuccess, msg, false);
261 if (VDBG) {
262 ALOGD("resolve succeeded for %d finding %s at %s:%d with txtLen %d",
263 refNumber, fullname, hosttarget, port, txtLen);
264 }
265 }
266 free(msg);
267 }
268
getAddrInfo(SocketClient * cli,int requestId,const char * interfaceName,uint32_t protocol,const char * hostname)269 void MDnsSdListener::Handler::getAddrInfo(SocketClient *cli, int requestId,
270 const char *interfaceName, uint32_t protocol, const char *hostname) {
271 if (VDBG) ALOGD("getAddrInfo(%d, %s %d, %s)", requestId, interfaceName, protocol, hostname);
272 Context *context = new Context(requestId, mListener);
273 DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
274 if (ref == NULL) {
275 ALOGE("request ID %d already in use during getAddrInfo call", requestId);
276 cli->sendMsg(ResponseCode::CommandParameterError,
277 "RequestId already in use during getAddrInfo call", false);
278 return;
279 }
280 DNSServiceFlags nativeFlags = 0;
281 int interfaceInt = ifaceNameToI(interfaceName);
282 DNSServiceErrorType result = DNSServiceGetAddrInfo(ref, nativeFlags, interfaceInt, protocol,
283 hostname, &MDnsSdListenerGetAddrInfoCallback, context);
284 if (result != kDNSServiceErr_NoError) {
285 ALOGE("getAddrInfo request %d got an error from DNSServiceGetAddrInfo %d", requestId,
286 result);
287 mMonitor->freeServiceRef(requestId);
288 cli->sendMsg(ResponseCode::CommandParameterError,
289 "getAddrInfo request got an error from DNSServiceGetAddrInfo", false);
290 return;
291 }
292 mMonitor->startMonitoring(requestId);
293 if (VDBG) ALOGD("getAddrInfo successful");
294 cli->sendMsg(ResponseCode::CommandOkay, "getAddrInfo started", false);
295 return;
296 }
297
MDnsSdListenerGetAddrInfoCallback(DNSServiceRef sdRef,DNSServiceFlags flags,uint32_t interface,DNSServiceErrorType errorCode,const char * hostname,const struct sockaddr * const sa,uint32_t ttl,void * inContext)298 void MDnsSdListenerGetAddrInfoCallback(DNSServiceRef sdRef, DNSServiceFlags flags,
299 uint32_t interface, DNSServiceErrorType errorCode, const char *hostname,
300 const struct sockaddr *const sa, uint32_t ttl, void *inContext) {
301 MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
302 int refNumber = context->mRefNumber;
303
304 if (errorCode != kDNSServiceErr_NoError) {
305 char *msg;
306 asprintf(&msg, "%d %d", refNumber, errorCode);
307 context->mListener->sendBroadcast(ResponseCode::ServiceGetAddrInfoFailed, msg, false);
308 if (DBG) ALOGE("getAddrInfo failure for %d, error= %d", refNumber, errorCode);
309 free(msg);
310 } else {
311 char addr[INET6_ADDRSTRLEN];
312 char *msg;
313 char *quotedHostname = SocketClient::quoteArg(hostname);
314 if (sa->sa_family == AF_INET) {
315 inet_ntop(sa->sa_family, &(((struct sockaddr_in *)sa)->sin_addr), addr, sizeof(addr));
316 } else {
317 inet_ntop(sa->sa_family, &(((struct sockaddr_in6 *)sa)->sin6_addr), addr, sizeof(addr));
318 }
319 asprintf(&msg, "%d %s %d %s", refNumber, quotedHostname, ttl, addr);
320 free(quotedHostname);
321 context->mListener->sendBroadcast(ResponseCode::ServiceGetAddrInfoSuccess, msg, false);
322 if (VDBG) {
323 ALOGD("getAddrInfo succeeded for %d: %s", refNumber, msg);
324 }
325 free(msg);
326 }
327 }
328
setHostname(SocketClient * cli,int requestId,const char * hostname)329 void MDnsSdListener::Handler::setHostname(SocketClient *cli, int requestId,
330 const char *hostname) {
331 if (VDBG) ALOGD("setHostname(%d, %s)", requestId, hostname);
332 Context *context = new Context(requestId, mListener);
333 DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
334 if (ref == NULL) {
335 ALOGE("request Id %d already in use during setHostname call", requestId);
336 cli->sendMsg(ResponseCode::CommandParameterError,
337 "RequestId already in use during setHostname call", false);
338 return;
339 }
340 DNSServiceFlags nativeFlags = 0;
341 DNSServiceErrorType result = DNSSetHostname(ref, nativeFlags, hostname,
342 &MDnsSdListenerSetHostnameCallback, context);
343 if (result != kDNSServiceErr_NoError) {
344 ALOGE("setHostname request %d got an error from DNSSetHostname %d", requestId, result);
345 mMonitor->freeServiceRef(requestId);
346 cli->sendMsg(ResponseCode::CommandParameterError,
347 "setHostname got an error from DNSSetHostname", false);
348 return;
349 }
350 mMonitor->startMonitoring(requestId);
351 if (VDBG) ALOGD("setHostname successful");
352 cli->sendMsg(ResponseCode::CommandOkay, "setHostname started", false);
353 return;
354 }
355
MDnsSdListenerSetHostnameCallback(DNSServiceRef sdRef,DNSServiceFlags flags,DNSServiceErrorType errorCode,const char * hostname,void * inContext)356 void MDnsSdListenerSetHostnameCallback(DNSServiceRef sdRef, DNSServiceFlags flags,
357 DNSServiceErrorType errorCode, const char *hostname, void *inContext) {
358 MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
359 char *msg;
360 int refNumber = context->mRefNumber;
361 if (errorCode != kDNSServiceErr_NoError) {
362 asprintf(&msg, "%d %d", refNumber, errorCode);
363 context->mListener->sendBroadcast(ResponseCode::ServiceSetHostnameFailed, msg, false);
364 if (DBG) ALOGE("setHostname failure for %d, error= %d", refNumber, errorCode);
365 } else {
366 char *quotedHostname = SocketClient::quoteArg(hostname);
367 asprintf(&msg, "%d %s", refNumber, quotedHostname);
368 free(quotedHostname);
369 context->mListener->sendBroadcast(ResponseCode::ServiceSetHostnameSuccess, msg, false);
370 if (VDBG) ALOGD("setHostname succeeded for %d. Set to %s", refNumber, hostname);
371 }
372 free(msg);
373 }
374
375
ifaceNameToI(const char * iface)376 int MDnsSdListener::Handler::ifaceNameToI(const char *iface) {
377 return 0;
378 }
379
iToIfaceName(int i)380 const char *MDnsSdListener::Handler::iToIfaceName(int i) {
381 return NULL;
382 }
383
iToFlags(int i)384 DNSServiceFlags MDnsSdListener::Handler::iToFlags(int i) {
385 return 0;
386 }
387
flagsToI(DNSServiceFlags flags)388 int MDnsSdListener::Handler::flagsToI(DNSServiceFlags flags) {
389 return 0;
390 }
391
runCommand(SocketClient * cli,int argc,char ** argv)392 int MDnsSdListener::Handler::runCommand(SocketClient *cli,
393 int argc, char **argv) {
394 if (argc < 2) {
395 char* msg = NULL;
396 asprintf( &msg, "Invalid number of arguments to mdnssd: %i", argc);
397 ALOGW("%s", msg);
398 cli->sendMsg(ResponseCode::CommandParameterError, msg, false);
399 free(msg);
400 return -1;
401 }
402
403 char* cmd = argv[1];
404
405 if (strcmp(cmd, "discover") == 0) {
406 if (argc != 4) {
407 cli->sendMsg(ResponseCode::CommandParameterError,
408 "Invalid number of arguments to mdnssd discover", false);
409 return 0;
410 }
411 int requestId = atoi(argv[2]);
412 char *serviceType = argv[3];
413
414 discover(cli, NULL, serviceType, NULL, requestId, 0);
415 } else if (strcmp(cmd, "stop-discover") == 0) {
416 stop(cli, argc, argv, "discover");
417 } else if (strcmp(cmd, "register") == 0) {
418 if (argc != 6) {
419 cli->sendMsg(ResponseCode::CommandParameterError,
420 "Invalid number of arguments to mdnssd register", false);
421 return 0;
422 }
423 int requestId = atoi(argv[2]);
424 char *serviceName = argv[3];
425 char *serviceType = argv[4];
426 int port = atoi(argv[5]);
427 char *interfaceName = NULL; // will use all
428 char *domain = NULL; // will use default
429 char *host = NULL; // will use default hostname
430 int textLen = 0;
431 void *textRecord = NULL;
432
433 serviceRegister(cli, requestId, interfaceName, serviceName,
434 serviceType, domain, host, port, textLen, textRecord);
435 } else if (strcmp(cmd, "stop-register") == 0) {
436 stop(cli, argc, argv, "register");
437 } else if (strcmp(cmd, "resolve") == 0) {
438 if (argc != 6) {
439 cli->sendMsg(ResponseCode::CommandParameterError,
440 "Invalid number of arguments to mdnssd resolve", false);
441 return 0;
442 }
443 int requestId = atoi(argv[2]);
444 char *interfaceName = NULL; // will use all
445 char *serviceName = argv[3];
446 char *regType = argv[4];
447 char *domain = argv[5];
448 resolveService(cli, requestId, interfaceName, serviceName, regType, domain);
449 } else if (strcmp(cmd, "stop-resolve") == 0) {
450 stop(cli, argc, argv, "resolve");
451 } else if (strcmp(cmd, "start-service") == 0) {
452 if (mMonitor->startService()) {
453 cli->sendMsg(ResponseCode::CommandOkay, "Service Started", false);
454 } else {
455 cli->sendMsg(ResponseCode::ServiceStartFailed, "Service already running", false);
456 }
457 } else if (strcmp(cmd, "stop-service") == 0) {
458 if (mMonitor->stopService()) {
459 cli->sendMsg(ResponseCode::CommandOkay, "Service Stopped", false);
460 } else {
461 cli->sendMsg(ResponseCode::ServiceStopFailed, "Service still in use", false);
462 }
463 } else if (strcmp(cmd, "sethostname") == 0) {
464 if (argc != 4) {
465 cli->sendMsg(ResponseCode::CommandParameterError,
466 "Invalid number of arguments to mdnssd sethostname", false);
467 return 0;
468 }
469 int requestId = atoi(argv[2]);
470 char *hostname = argv[3];
471 setHostname(cli, requestId, hostname);
472 } else if (strcmp(cmd, "stop-sethostname") == 0) {
473 stop(cli, argc, argv, "sethostname");
474 } else if (strcmp(cmd, "getaddrinfo") == 0) {
475 if (argc != 4) {
476 cli->sendMsg(ResponseCode::CommandParameterError,
477 "Invalid number of arguments to mdnssd getaddrinfo", false);
478 return 0;
479 }
480 int requestId = atoi(argv[2]);
481 char *hostname = argv[3];
482 char *interfaceName = NULL; // default
483 int protocol = 0; // intelligient heuristic (both v4 + v6)
484 getAddrInfo(cli, requestId, interfaceName, protocol, hostname);
485 } else if (strcmp(cmd, "stop-getaddrinfo") == 0) {
486 stop(cli, argc, argv, "getaddrinfo");
487 } else {
488 if (VDBG) ALOGE("Unknown cmd %s", cmd);
489 cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown mdnssd cmd", false);
490 return 0;
491 }
492 return 0;
493 }
494
Monitor()495 MDnsSdListener::Monitor::Monitor() {
496 mHead = NULL;
497 pthread_mutex_init(&mHeadMutex, NULL);
498 socketpair(AF_LOCAL, SOCK_STREAM, 0, mCtrlSocketPair);
499 pthread_create(&mThread, NULL, MDnsSdListener::Monitor::threadStart, this);
500 }
501
threadStart(void * obj)502 void *MDnsSdListener::Monitor::threadStart(void *obj) {
503 Monitor *monitor = reinterpret_cast<Monitor *>(obj);
504
505 monitor->run();
506 delete monitor;
507 pthread_exit(NULL);
508 return NULL;
509 }
510
startService()511 int MDnsSdListener::Monitor::startService() {
512 int result = 0;
513 char property_value[PROPERTY_VALUE_MAX];
514 pthread_mutex_lock(&mHeadMutex);
515 property_get(MDNS_SERVICE_STATUS, property_value, "");
516 if (strcmp("running", property_value) != 0) {
517 ALOGD("Starting MDNSD");
518 property_set("ctl.start", MDNS_SERVICE_NAME);
519 wait_for_property(MDNS_SERVICE_STATUS, "running", 5);
520 result = -1;
521 } else {
522 result = 0;
523 }
524 pthread_mutex_unlock(&mHeadMutex);
525 return result;
526 }
527
stopService()528 int MDnsSdListener::Monitor::stopService() {
529 int result = 0;
530 pthread_mutex_lock(&mHeadMutex);
531 if (mHead == NULL) {
532 ALOGD("Stopping MDNSD");
533 property_set("ctl.stop", MDNS_SERVICE_NAME);
534 wait_for_property(MDNS_SERVICE_STATUS, "stopped", 5);
535 result = -1;
536 } else {
537 result = 0;
538 }
539 pthread_mutex_unlock(&mHeadMutex);
540 return result;
541 }
542
run()543 void MDnsSdListener::Monitor::run() {
544 int pollCount = 1;
545 mPollSize = 10;
546
547 mPollFds = (struct pollfd *)calloc(sizeof(struct pollfd), mPollSize);
548 mPollRefs = (DNSServiceRef **)calloc(sizeof(DNSServiceRef *), mPollSize);
549
550 mPollFds[0].fd = mCtrlSocketPair[0];
551 mPollFds[0].events = POLLIN;
552
553 if (VDBG) ALOGD("MDnsSdListener starting to monitor");
554 while (1) {
555 if (VDBG) ALOGD("Going to poll with pollCount %d", pollCount);
556 int pollResults = poll(mPollFds, pollCount, 10000000);
557 if (pollResults < 0) {
558 ALOGE("Error in poll - got %d", errno);
559 } else if (pollResults > 0) {
560 if (VDBG) ALOGD("Monitor poll got data pollCount = %d, %d", pollCount, pollResults);
561 for(int i = 1; i < pollCount; i++) {
562 if (mPollFds[i].revents != 0) {
563 if (VDBG) {
564 ALOGD("Monitor found [%d].revents = %d - calling ProcessResults",
565 i, mPollFds[i].revents);
566 }
567 DNSServiceProcessResult(*(mPollRefs[i]));
568 mPollFds[i].revents = 0;
569 }
570 }
571 if (VDBG) ALOGD("controlSocket shows revent= %d", mPollFds[0].revents);
572 switch (mPollFds[0].revents) {
573 case POLLIN: {
574 char readBuf[2];
575 read(mCtrlSocketPair[0], &readBuf, 1);
576 if (DBG) ALOGD("MDnsSdListener::Monitor got %c", readBuf[0]);
577 if (memcmp(RESCAN, readBuf, 1) == 0) {
578 pollCount = rescan();
579 }
580 }
581 }
582 mPollFds[0].revents = 0;
583 } else {
584 if (VDBG) ALOGD("MDnsSdListener::Monitor poll timed out");
585 }
586 }
587 free(mPollFds);
588 free(mPollRefs);
589 }
590
591 #define DBG_RESCAN 0
592
rescan()593 int MDnsSdListener::Monitor::rescan() {
594 // rescan the list from mHead and make new pollfds and serviceRefs
595 if (VDBG) {
596 ALOGD("MDnsSdListener::Monitor poll rescanning - size=%d, live=%d", mPollSize, mLiveCount);
597 }
598 int count = 0;
599 pthread_mutex_lock(&mHeadMutex);
600 Element **prevPtr = &mHead;
601 int i = 1;
602 if (mPollSize <= mLiveCount) {
603 mPollSize = mLiveCount + 5;
604 free(mPollFds);
605 free(mPollRefs);
606 mPollFds = (struct pollfd *)calloc(sizeof(struct pollfd), mPollSize);
607 mPollRefs = (DNSServiceRef **)calloc(sizeof(DNSServiceRef *), mPollSize);
608 } else {
609 memset(mPollFds, sizeof(struct pollfd) * mPollSize, 0);
610 memset(mPollRefs, sizeof(DNSServiceRef *) * mPollSize, 0);
611 }
612 mPollFds[0].fd = mCtrlSocketPair[0];
613 mPollFds[0].events = POLLIN;
614 if (DBG_RESCAN) ALOGD("mHead = %p", mHead);
615 while (*prevPtr != NULL) {
616 if (DBG_RESCAN) ALOGD("checking %p, mReady = %d", *prevPtr, (*prevPtr)->mReady);
617 if ((*prevPtr)->mReady == 1) {
618 int fd = DNSServiceRefSockFD((*prevPtr)->mRef);
619 if (fd != -1) {
620 if (DBG_RESCAN) ALOGD(" adding FD %d", fd);
621 mPollFds[i].fd = fd;
622 mPollFds[i].events = POLLIN;
623 mPollRefs[i] = &((*prevPtr)->mRef);
624 i++;
625 } else {
626 ALOGE("Error retreving socket FD for live ServiceRef");
627 }
628 prevPtr = &((*prevPtr)->mNext); // advance to the next element
629 } else if ((*prevPtr)->mReady == -1) {
630 if (DBG_RESCAN) ALOGD(" removing %p from play", *prevPtr);
631 Element *cur = *prevPtr;
632 *prevPtr = (cur)->mNext; // change our notion of this element and don't advance
633 delete cur;
634 }
635 }
636 pthread_mutex_unlock(&mHeadMutex);
637 return i;
638 }
639
allocateServiceRef(int id,Context * context)640 DNSServiceRef *MDnsSdListener::Monitor::allocateServiceRef(int id, Context *context) {
641 if (lookupServiceRef(id) != NULL) {
642 delete(context);
643 return NULL;
644 }
645 Element *e = new Element(id, context);
646 pthread_mutex_lock(&mHeadMutex);
647 e->mNext = mHead;
648 mHead = e;
649 pthread_mutex_unlock(&mHeadMutex);
650 return &(e->mRef);
651 }
652
lookupServiceRef(int id)653 DNSServiceRef *MDnsSdListener::Monitor::lookupServiceRef(int id) {
654 pthread_mutex_lock(&mHeadMutex);
655 Element *cur = mHead;
656 while (cur != NULL) {
657 if (cur->mId == id) {
658 DNSServiceRef *result = &(cur->mRef);
659 pthread_mutex_unlock(&mHeadMutex);
660 return result;
661 }
662 cur = cur->mNext;
663 }
664 pthread_mutex_unlock(&mHeadMutex);
665 return NULL;
666 }
667
startMonitoring(int id)668 void MDnsSdListener::Monitor::startMonitoring(int id) {
669 if (VDBG) ALOGD("startMonitoring %d", id);
670 pthread_mutex_lock(&mHeadMutex);
671 Element *cur = mHead;
672 while (cur != NULL) {
673 if (cur->mId == id) {
674 if (DBG_RESCAN) ALOGD("marking %p as ready to be added", cur);
675 mLiveCount++;
676 cur->mReady = 1;
677 pthread_mutex_unlock(&mHeadMutex);
678 write(mCtrlSocketPair[1], RESCAN, 1); // trigger a rescan for a fresh poll
679 if (VDBG) ALOGD("triggering rescan");
680 return;
681 }
682 cur = cur->mNext;
683 }
684 pthread_mutex_unlock(&mHeadMutex);
685 }
686
687 #define NAP_TIME 200 // 200 ms between polls
wait_for_property(const char * name,const char * desired_value,int maxwait)688 static int wait_for_property(const char *name, const char *desired_value, int maxwait)
689 {
690 char value[PROPERTY_VALUE_MAX] = {'\0'};
691 int maxnaps = (maxwait * 1000) / NAP_TIME;
692
693 if (maxnaps < 1) {
694 maxnaps = 1;
695 }
696
697 while (maxnaps-- > 0) {
698 usleep(NAP_TIME * 1000);
699 if (property_get(name, value, NULL)) {
700 if (desired_value == NULL || strcmp(value, desired_value) == 0) {
701 return 0;
702 }
703 }
704 }
705 return -1; /* failure */
706 }
707
freeServiceRef(int id)708 void MDnsSdListener::Monitor::freeServiceRef(int id) {
709 if (VDBG) ALOGD("freeServiceRef %d", id);
710 pthread_mutex_lock(&mHeadMutex);
711 Element **prevPtr = &mHead;
712 Element *cur;
713 while (*prevPtr != NULL) {
714 cur = *prevPtr;
715 if (cur->mId == id) {
716 if (DBG_RESCAN) ALOGD("marking %p as ready to be removed", cur);
717 mLiveCount--;
718 if (cur->mReady == 1) {
719 cur->mReady = -1; // tell poll thread to delete
720 write(mCtrlSocketPair[1], RESCAN, 1); // trigger a rescan for a fresh poll
721 if (VDBG) ALOGD("triggering rescan");
722 } else {
723 *prevPtr = cur->mNext;
724 delete cur;
725 }
726 pthread_mutex_unlock(&mHeadMutex);
727 return;
728 }
729 prevPtr = &(cur->mNext);
730 }
731 pthread_mutex_unlock(&mHeadMutex);
732 }
733