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