1: #include "global.h"
2: #include "rtlm.h"
3: #include "utils.h"
4: #include "mqttd.h"
5: #include "mqttd_calls.h"
6:
7:
8: static void *startSession(sched_task_t *task);
9: static pthread_attr_t attr;
10:
11:
12: static inline struct tagSession *
13: initSession(int sock, ait_val_t * __restrict v)
14: {
15: struct tagSession *sess = NULL;
16: const char *str;
17:
18: ioTRACE(5);
19:
20: if (!v)
21: return NULL;
22:
23: sess = malloc(sizeof(struct tagSession));
24: if (!sess) {
25: ioSYSERR(0);
26: io_freeVar(v);
27: return NULL;
28: } else
29: memset(sess, 0, sizeof(struct tagSession));
30:
31: pthread_mutex_init(&sess->sess_mtx, NULL);
32:
33: SLIST_INIT(&sess->sess_subscr);
34:
35: str = cfg_getAttribute(&cfg, "mqttd", "retry");
36: if (!str)
37: sess->sess_retry = DEFAULT_RETRY;
38: else
39: sess->sess_retry = strtol(str, NULL, 0);
40:
41: if (!(sess->sess_root = schedBegin())) {
42: ioLIBERR(sched);
43: free(sess);
44: io_freeVar(v);
45: return NULL;
46: }
47:
48: sess->sess_buf = mqtt_msgAlloc(USHRT_MAX);
49: if (!sess->sess_buf) {
50: ioLIBERR(mqtt);
51: schedEnd(&sess->sess_root);
52: free(sess);
53: io_freeVar(v);
54: return NULL;
55: }
56:
57: /* init server actor */
58: sess->sess_srv = mqtt_srv_Init(sock, sess->sess_buf);
59: if (!sess->sess_srv) {
60: ioDEBUG(3, "Error:: in srv_Init #%d - %s", mqtt_GetErrno(), mqtt_GetError());
61: mqtt_msgFree(&sess->sess_buf, 42);
62: schedEnd(&sess->sess_root);
63: free(sess);
64: io_freeVar(v);
65: return NULL;
66: } else {
67: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_CONNECT, cmdCONNECT);
68: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_PUBLISH, cmdPUBLISH);
69: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_PUBREL, cmdPUBREL);
70: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_SUBSCRIBE, cmdSUBSCRIBE);
71: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_UNSUBSCRIBE, cmdUNSUBSCRIBE);
72: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_PINGREQ, cmdPINGREQ);
73: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_DISCONNECT, cmdDISCONNECT);
74: }
75:
76: sess->sess_sock = sock;
77: strlcpy(sess->sess_addr, (char*) AIT_GET_STR(v), sizeof sess->sess_addr);
78: io_freeVar(v);
79: return sess;
80: }
81:
82: static void
83: finiSession(struct tagSession *sess)
84: {
85: struct tagStore *store;
86:
87: ioTRACE(5);
88:
89: if (!sess)
90: return;
91:
92: if (call.FiniSessPUB)
93: call.FiniSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, "%");
94:
95: SESS_ELEM_LOCK(sess);
96:
97: while ((store = SLIST_FIRST(&sess->sess_subscr))) {
98: SLIST_REMOVE_HEAD(&sess->sess_subscr, st_node);
99:
100: if (store->st_subscr.sub_topic.msg_base)
101: free(store->st_subscr.sub_topic.msg_base);
102: if (store->st_subscr.sub_value.msg_base)
103: free(store->st_subscr.sub_value.msg_base);
104:
105: free(store);
106: }
107: SESS_ELEM_UNLOCK(sess);
108: pthread_mutex_destroy(&sess->sess_mtx);
109:
110: schedEnd(&sess->sess_root);
111:
112: if (sess->sess_will.msg)
113: free(sess->sess_will.msg);
114: if (sess->sess_will.topic)
115: free(sess->sess_will.topic);
116:
117: if (sess->sess_sock > STDERR_FILENO)
118: srv_Close(sess->sess_sock);
119:
120: mqtt_srv_Fini(&sess->sess_srv);
121: mqtt_msgFree(&sess->sess_buf, 42);
122:
123: free(sess);
124: }
125:
126: static void
127: stopSession(struct tagSession *sess)
128: {
129: mqtt_msg_t msg = { NULL, 0 };
130: int ret;
131:
132: ioTRACE(4);
133:
134: assert(sess);
135:
136: SESS_LOCK;
137: TAILQ_REMOVE(&Sessions, sess, sess_node);
138: SESS_UNLOCK;
139:
140: ret = mqtt_msgDISCONNECT(&msg);
141: send(sess->sess_sock, msg.msg_base, ret, MSG_NOSIGNAL);
142: free(msg.msg_base);
143:
144: ioDEBUG(1, "Close socket=%d", sess->sess_sock);
145: finiSession(sess);
146:
147: call.LOG(logg, "Session %s stopped from %s for user %s.\n", sess->sess_cid,
148: sess->sess_addr, sess->sess_user);
149: }
150:
151: static int
152: KASession(struct tagSession *sess)
153: {
154: mqtt_msg_t msg = { NULL, 0 };
155: int ret;
156: struct pollfd pfd;
157:
158: ioTRACE(4);
159:
160: assert(sess);
161:
162: /* ping request */
163: ret = mqtt_msgPINGREQ(&msg);
164: if ((ret = send(sess->sess_sock, msg.msg_base, ret, MSG_NOSIGNAL)) == -1) {
165: ioDEBUG(3, "Error:: send(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
166: return -1;
167: } else {
168: ioDEBUG(5, "Sended %d bytes for ping request", ret);
169: free(msg.msg_base);
170: memset(&msg, 0, sizeof msg);
171: }
172:
173: pfd.fd = sess->sess_sock;
174: pfd.events = POLLIN | POLLPRI;
175: if ((ret = poll(&pfd, 1, sess->sess_ka * 1000)) == -1 ||
176: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
177: ioDEBUG(3, "Error:: poll(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
178: return -1;
179: } else if (!ret) {
180: ioDEBUG(5, "Warning:: Session is abandoned ... must be disconnect!");
181: return 1;
182: }
183: /* receive & decode packet */
184: if (recv(sess->sess_sock, sess->sess_buf->msg_base, sess->sess_buf->msg_len, 0) == -1) {
185: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
186: return -1;
187: }
188: if (mqtt_readPINGRESP(sess->sess_buf)) {
189: ioDEBUG(5, "Warning:: Session is broken, not hear ping response ... must be disconnect!");
190: return 2;
191: }
192:
193: /* Keep Alive is OK! */
194: return 0;
195: }
196:
197: static void *
198: thrSession(struct tagSession *sess)
199: {
200: int ret, locKill = 42;
201: struct pollfd pfd;
202: struct mqtthdr *hdr;
203: ait_val_t *v;
204:
205: pthread_cleanup_push((void(*)(void*)) stopSession, sess);
206: ioTRACE(2);
207:
208: pfd.fd = sess->sess_sock;
209: pfd.events = POLLIN | POLLPRI;
210: while (!Kill && locKill) {
211: if ((ret = poll(&pfd, 1, sess->sess_ka * 1000)) == -1 ||
212: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
213: ioDEBUG(3, "Error:: poll(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
214: break;
215: } else if (!ret && (ret = KASession(sess))) {
216: call.LOG(logg, "Session %s keep-alive missing from %s for user %s ...\n",
217: sess->sess_cid, sess->sess_addr, sess->sess_user);
218: break;
219: }
220: /* receive & decode packet */
221: if ((ret = recv(sess->sess_sock, sess->sess_buf->msg_base, sess->sess_buf->msg_len, 0)) == -1) {
222: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
223: break;
224: } else if (!ret) {
225: ioDEBUG(4, "Session %s EOF received.", sess->sess_cid);
226: break;
227: } else
228: hdr = (struct mqtthdr*) sess->sess_buf->msg_base;
229:
230: /* dispatch message type */
231: if (mqtt_srv_Dispatch(sess->sess_srv, sess))
232: ioLIBERR(mqtt);
233: switch (hdr->mqtt_msg.type) {
234: case MQTT_TYPE_CONNECT:
235: ioDEBUG(5, "Exec CONNECT session");
236: if ((v = io_allocVar())) {
237: AIT_SET_STR(v, sess->sess_addr);
238: if (!schedEvent(root, startSession, v, (u_long) sess->sess_sock, sess, ret))
239: io_freeVar(v);
240: } else
241: ioLIBERR(mqtt);
242:
243: SESS_LOCK;
244: TAILQ_REMOVE(&Sessions, sess, sess_node);
245: SESS_UNLOCK;
246:
247: locKill ^= locKill;
248: break;
249: case MQTT_TYPE_DISCONNECT:
250: ioDEBUG(5, "Exec DISCONNECT session");
251: SESS_LOCK;
252: TAILQ_REMOVE(&Sessions, sess, sess_node);
253: SESS_UNLOCK;
254:
255: finiSession(sess);
256: locKill ^= locKill;
257: continue;
258: case MQTT_TYPE_PUBLISH:
259: ioDEBUG(5, "Exec PUBLISH topic QoS=%d", hdr->mqtt_msg.qos);
260: /*
261: if (cmdPUBLISH(sess))
262: locKill ^= locKill;
263: */
264: break;
265: case MQTT_TYPE_PUBREL:
266: break;
267: case MQTT_TYPE_SUBSCRIBE:
268: break;
269: case MQTT_TYPE_UNSUBSCRIBE:
270: break;
271: case MQTT_TYPE_PINGREQ:
272: ioDEBUG(5, "Exec PINGREQ session");
273: break;
274: case MQTT_TYPE_PINGRESP:
275: ioDEBUG(5, "Exec PINGRESP session");
276: break;
277: default:
278: ioDEBUG(5, "Error:: Session %s, wrong command %d - DISCARDED",
279: sess->sess_cid, hdr->mqtt_msg.type);
280: break;
281: }
282: }
283:
284: pthread_cleanup_pop(locKill);
285: pthread_exit(NULL);
286: return NULL;
287: }
288:
289: static void *
290: startSession(sched_task_t *task)
291: {
292: u_char basebuf[USHRT_MAX];
293: mqtt_msg_t msg = { NULL, 0 }, buf = { basebuf, sizeof basebuf };
294: mqtthdr_connflgs_t flg;
295: mqtthdr_connack_t cack;
296: struct tagSession *s, *sess = NULL;
297: int ret;
298:
299: ioTRACE(4);
300:
301: assert(task);
302:
303: if (!TASK_DATA(task)) {
304: /* flow from accept new clients */
305: sess = initSession(TASK_FD(task), TASK_ARG(task));
306: if (!sess) {
307: io_freeVar(TASK_ARG(task));
308: close(TASK_FD(task));
309: return NULL;
310: }
311:
312: /* receive & decode packet */
313: if (recv(sess->sess_sock, buf.msg_base, buf.msg_len, 0) == -1) {
314: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
315: finiSession(sess);
316: return NULL;
317: }
318: } else {
319: sess = TASK_DATA(task);
320: buf.msg_len = TASK_DATLEN(task) > sizeof basebuf ? sizeof basebuf : TASK_DATLEN(task);
321: memcpy(buf.msg_base, sess->sess_buf->msg_base, buf.msg_len);
322: }
323:
324: cack = mqtt_readCONNECT(&buf, &sess->sess_ka, sess->sess_cid, sizeof sess->sess_cid,
325: sess->sess_user, sizeof sess->sess_user, sess->sess_pass, sizeof sess->sess_pass,
326: &sess->sess_will.topic, &sess->sess_will.msg);
327: ret = cack.retcode;
328: flg.flags = cack.reserved;
329: if (flg.reserved) {
330: ioDEBUG(3, "Error:: in MQTT protocol #%d - %s", mqtt_GetErrno(), mqtt_GetError());
331: goto end;
332: } else {
333: sess->sess_clean = flg.clean_sess;
334: sess->sess_will.qos = flg.will_qos;
335: sess->sess_will.retain = flg.will_retain;
336: sess->sess_will.flag = flg.will_flg;
337: }
338:
339: /* check online table for user */
340: if (call.LoginACC(&cfg, acc, sess->sess_user, sess->sess_pass) < 1) {
341: ioDEBUG(0, "Login:: DENIED for username %s and password %s",
342: sess->sess_user, sess->sess_pass);
343: ret = MQTT_RETCODE_DENIED;
344: goto end;
345: } else {
346: ioDEBUG(1, "Login:: ALLOWED for username %s ...", sess->sess_user);
347: ret = MQTT_RETCODE_ACCEPTED;
348: }
349:
350: if (call.FiniSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, "%") > 0) {
351: ioDEBUG(2, "Old session %s should be disconnect!", sess->sess_cid);
352: TAILQ_FOREACH(s, &Sessions, sess_node)
353: if (!strcmp(s->sess_cid, sess->sess_cid)) {
354: /* found stale session & disconnect it! */
355: stopSession(s);
356: break;
357: }
358: }
359:
360: if (call.InitSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, sess->sess_addr,
361: sess->sess_will.flag, sess->sess_will.topic, sess->sess_will.msg,
362: sess->sess_will.qos, sess->sess_will.retain) == -1) {
363: ioDEBUG(0, "Session %s DENIED for username %s", sess->sess_cid, sess->sess_user);
364: ret = MQTT_RETCODE_DENIED;
365: goto end;
366: } else {
367: ioDEBUG(0, "Session %s from %s and username %s is started",
368: sess->sess_cid, sess->sess_addr, sess->sess_user);
369: ret = MQTT_RETCODE_ACCEPTED;
370: }
371:
372: ret = mqtt_msgCONNACK(&msg, ret);
373: if ((ret = send(sess->sess_sock, msg.msg_base, ret, 0)) == -1) {
374: ioDEBUG(3, "Error:: send(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
375: finiSession(sess);
376: return NULL;
377: } else {
378: ioDEBUG(5, "Sended %d bytes", ret);
379: free(msg.msg_base);
380: memset(&msg, 0, sizeof msg);
381: }
382:
383: /* Start session thread OK ... */
384: SESS_LOCK;
385: TAILQ_INSERT_TAIL(&Sessions, sess, sess_node);
386: pthread_create(&sess->sess_tid, &attr, (void*(*)(void*)) thrSession, sess);
387: SESS_UNLOCK;
388:
389: call.LOG(logg, "Session %s started from %s for user %s (timeout=%d) OK!\n", sess->sess_cid,
390: sess->sess_addr, sess->sess_user, sess->sess_ka);
391: return NULL;
392: end: /* close client connection */
393: ret = mqtt_msgCONNACK(&msg, ret);
394: if ((ret = send(sess->sess_sock, msg.msg_base, ret, 0)) == -1) {
395: ioDEBUG(3, "Error:: send(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
396: } else {
397: ioDEBUG(5, "Sended %d bytes", ret);
398: free(msg.msg_base);
399: memset(&msg, 0, sizeof msg);
400: }
401:
402: ioDEBUG(1, "Close client %s with socket=%d", sess->sess_addr, sess->sess_sock);
403: finiSession(sess);
404: return NULL;
405: }
406:
407: static void *
408: acceptClient(sched_task_t *task)
409: {
410: int cli;
411: io_sockaddr_t sa;
412: socklen_t sslen = sizeof sa.ss;
413: ait_val_t *v;
414: char str[STRSIZ];
415:
416: ioTRACE(4);
417:
418: assert(task);
419:
420: if ((cli = accept(TASK_FD(task), &sa.sa, &sslen)) == -1)
421: goto end;
422: else
423: fcntl(TASK_FD(task), F_SETFL, fcntl(TASK_FD(task), F_GETFL, 0) | O_NONBLOCK);
424:
425: v = io_allocVar();
426: if (!v) {
427: ioLIBERR(io);
428: close(cli);
429: goto end;
430: } else {
431: memset(str, 0, sizeof str);
432: snprintf(str, sizeof str, "%s:%hu", io_n2addr(&sa, v), io_n2port(&sa));
433: AIT_SET_STR(v, str);
434: }
435: ioDEBUG(1, "Connected client with socket=%d from %s", cli, AIT_GET_STR(v));
436:
437: if (!schedRead(root, startSession, v, cli, NULL, 0)) {
438: io_freeVar(v);
439: close(cli);
440: ioDEBUG(1, "Terminated client with socket=%d", cli);
441: }
442: end:
443: if (!schedRead(TASK_ROOT(task), acceptClient, NULL, TASK_FD(task), NULL, 0))
444: ioLIBERR(sched);
445: return NULL;
446: }
447:
448: /* ----------------------------------------------------------------------- */
449:
450: int
451: Run(int sock)
452: {
453: struct tagPub *pub;
454: struct timespec pl = { 0, 100000000 };
455:
456: ioTRACE(1);
457:
458: if (listen(sock, SOMAXCONN) == -1) {
459: ioSYSERR(0);
460: return -1;
461: } else
462: fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
463:
464: /* state machine - accept new connections */
465: if (!schedRead(root, acceptClient, NULL, sock, NULL, 0)) {
466: ioLIBERR(sched);
467: return -1;
468: }
469:
470: pthread_attr_init(&attr);
471: pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
472:
473: schedPolling(root, &pl, NULL);
474: schedRun(root, &Kill);
475:
476: pthread_attr_destroy(&attr);
477:
478: /* free all undeleted elements into lists */
479: PUBS_LOCK;
480: TAILQ_FOREACH(pub, &Pubs, pub_node) {
481: TAILQ_REMOVE(&Pubs, pub, pub_node);
482:
483: AIT_FREE_VAL(&pub->pub_name);
484: if (pub->pub_packet.msg_base)
485: free(pub->pub_packet.msg_base);
486: }
487: PUBS_UNLOCK;
488: return 0;
489: }
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