1: #include "global.h"
2: #include "rtlm.h"
3: #include "mqttd.h"
4: #include "mqttd_calls.h"
5: #include "utils.h"
6:
7:
8: static inline struct tagSession *
9: initSession(int sock, ait_val_t * __restrict v)
10: {
11: struct tagSession *sess = NULL;
12: const char *str;
13:
14: ioTRACE(5);
15:
16: if (!v)
17: return NULL;
18:
19: sess = io_malloc(sizeof(struct tagSession));
20: if (!sess) {
21: ioSYSERR(0);
22: return NULL;
23: } else
24: memset(sess, 0, sizeof(struct tagSession));
25:
26: SLIST_INIT(&sess->sess_subscr);
27:
28: str = cfg_getAttribute(&cfg, "mqttd", "retry");
29: if (!str)
30: sess->sess_retry = DEFAULT_RETRY;
31: else
32: sess->sess_retry = strtol(str, NULL, 0);
33:
34: sess->sess_buf = mqtt_msgAlloc(USHRT_MAX);
35: if (!sess->sess_buf) {
36: ioLIBERR(mqtt);
37: io_free(sess);
38: return NULL;
39: }
40:
41: /* init server actor */
42: sess->sess_srv = mqtt_srv_cliInit(sock, sess->sess_buf, sess->sess_ka, 1);
43: if (!sess->sess_srv) {
44: ioDEBUG(3, "Error:: in srv_Init #%d - %s", mqtt_GetErrno(), mqtt_GetError());
45: mqtt_msgFree(&sess->sess_buf, 42);
46: io_free(sess);
47: return NULL;
48: } else {
49: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_CONNECT, cmdCONNECT);
50: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_PUBLISH, cmdPUBLISH);
51: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_PUBREL, cmdPUBREL);
52: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_SUBSCRIBE, cmdSUBSCRIBE);
53: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_UNSUBSCRIBE, cmdUNSUBSCRIBE);
54: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_PINGREQ, cmdPINGREQ);
55: mqtt_srv_setCmd(sess->sess_srv, MQTT_TYPE_DISCONNECT, cmdDISCONNECT);
56: }
57:
58: sess->sess_sock = sock;
59: strlcpy(sess->sess_addr, (char*) AIT_GET_STR(v), sizeof sess->sess_addr);
60: return sess;
61: }
62:
63: static void
64: finiSession(struct tagSession *sess)
65: {
66: struct tagStore *store;
67:
68: ioTRACE(5);
69:
70: if (!sess)
71: return;
72:
73: schedCancelby(root, taskTIMER, CRITERIA_CALL, sendRetain, NULL);
74:
75: if (sess->sess_clean) {
76: if (call.FiniSessPUB)
77: call.FiniSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, "%");
78: if (call.DeletePUB_subscribe)
79: call.DeletePUB_subscribe(&cfg, pub, sess->sess_cid, "%", sess->sess_user, "%");
80: if (call.WipePUB_topic) /* only dynamic messages */
81: call.WipePUB_topic(&cfg, pub, sess->sess_cid, sess->sess_user, 0);
82: }
83:
84: while ((store = SLIST_FIRST(&sess->sess_subscr))) {
85: SLIST_REMOVE_HEAD(&sess->sess_subscr, st_node);
86:
87: if (store->st_subscr.sub_topic.msg_base)
88: free(store->st_subscr.sub_topic.msg_base);
89: if (store->st_subscr.sub_value.msg_base)
90: free(store->st_subscr.sub_value.msg_base);
91:
92: io_free(store);
93: }
94:
95: if (sess->sess_will.flag)
96: pubWill(sess);
97:
98: if (sess->sess_will.topic)
99: free(sess->sess_will.topic);
100: if (sess->sess_will.msg)
101: free(sess->sess_will.msg);
102:
103: if (sess->sess_sock > STDERR_FILENO)
104: srv_Close(sess->sess_sock);
105:
106: mqtt_srv_cliFini(&sess->sess_srv);
107: mqtt_msgFree(&sess->sess_buf, 42);
108:
109: io_free(sess);
110: }
111:
112: static void *
113: leaveClient(sched_task_t *task)
114: {
115: struct tagSession *sess;
116: int ret;
117:
118: ioTRACE(4);
119:
120: assert(task);
121:
122: sess = TASK_ARG(task);
123: assert(sess);
124:
125: TAILQ_REMOVE(&Sessions, sess, sess_node);
126:
127: ret = mqtt_msgDISCONNECT(sess->sess_buf);
128: send(TASK_FD(task), sess->sess_buf->msg_base, ret, MSG_NOSIGNAL);
129:
130: ioDEBUG(1, "Close socket=%ld", (long) TASK_FD(task));
131: call.LOG(logg, "Session %s stopped from %s for user %s.\n", sess->sess_cid,
132: sess->sess_addr, sess->sess_user);
133:
134: finiSession(sess);
135: return NULL;
136: }
137:
138: static void *
139: dispatchSession(sched_task_t *task)
140: {
141: int ret, len = 0;
142: struct tagSession *sess;
143:
144: ioTRACE(2);
145:
146: assert(task);
147:
148: sess = TASK_ARG(task);
149: assert(sess);
150:
151: /* receive & decode packet */
152: if ((ret = recv(TASK_FD(task), sess->sess_buf->msg_base, sess->sess_buf->msg_len, 0)) == -1) {
153: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
154: TAILQ_REMOVE(&Sessions, sess, sess_node);
155: finiSession(sess);
156: return NULL;
157: } else if (!ret) {
158: ioDEBUG(4, "Session %s EOF received.", sess->sess_cid);
159: TAILQ_REMOVE(&Sessions, sess, sess_node);
160: finiSession(sess);
161: return NULL;
162: }
163:
164: do {
165: /* dispatch message type */
166: if ((len = mqtt_srv_cliDispatch(sess->sess_srv, ret, sess)) < 0) {
167: if (len == -1) {
168: ioLIBERR(mqtt);
169: finiSession(sess);
170: } else if (len == -2) {
171: TAILQ_REMOVE(&Sessions, sess, sess_node);
172: finiSession(sess);
173: } else if (len == -3)
174: schedEvent(root, startSession, NULL, (u_long) TASK_FD(task), sess, ret);
175: } else
176: ret -= len;
177: } while (len > 0 && ret > 0);
178:
179: if (len >= 0 && !schedRead(root, dispatchSession, TASK_ARG(task), TASK_FD(task), NULL, 0)) {
180: ioLIBERR(sched);
181: TAILQ_REMOVE(&Sessions, sess, sess_node);
182: finiSession(sess);
183: }
184: return NULL;
185: }
186:
187: static int
188: loadSubscribes(struct tagSession * __restrict sess, mqtt_subscr_t * __restrict subs)
189: {
190: register int i;
191: struct tagStore *store;
192:
193: if (!subs)
194: return -1;
195:
196: for (i = 0; subs[i].sub_topic.msg_base; i++) {
197: store = io_malloc(sizeof(struct tagStore));
198: if (!store) {
199: ioSYSERR(0);
200: continue;
201: } else {
202: store->st_msgid = 0;
203: mqtt_subCopy(&store->st_subscr, &subs[i]);
204: }
205:
206: /* add to cache */
207: SLIST_INSERT_HEAD(&sess->sess_subscr, store, st_node);
208: }
209:
210: return 0;
211: }
212:
213: void *
214: startSession(sched_task_t *task)
215: {
216: u_char basebuf[USHRT_MAX];
217: mqtt_msg_t buf = { basebuf, sizeof basebuf };
218: mqtthdr_connflgs_t flg;
219: mqtthdr_connack_t cack;
220: ait_val_t *v;
221: struct tagSession *s, *sess = NULL;
222: int ret, wlen;
223: mqtt_subscr_t *subs;
224: struct timespec ts = { RETAIN_TIMEOUT, 0 };
225: intptr_t sock;
226:
227: ioTRACE(4);
228:
229: assert(task);
230:
231: if (!TASK_DATA(task)) {
232: v = TASK_ARG(task);
233: /* flow from accept new clients */
234: sess = initSession(TASK_FD(task), v);
235: io_freeVar(&v);
236: if (!sess) {
237: close(TASK_FD(task));
238: return NULL;
239: }
240:
241: /* receive & decode packet */
242: if (recv(sess->sess_sock, buf.msg_base, buf.msg_len, 0) == -1) {
243: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
244: finiSession(sess);
245: return NULL;
246: }
247: } else {
248: sess = TASK_DATA(task);
249: assert(sess);
250:
251: buf.msg_len = TASK_DATLEN(task) > sizeof basebuf ? sizeof basebuf : TASK_DATLEN(task);
252: memcpy(buf.msg_base, sess->sess_buf->msg_base, buf.msg_len);
253: }
254:
255: cack = mqtt_readCONNECT(&buf, &sess->sess_ka, sess->sess_cid, sizeof sess->sess_cid,
256: sess->sess_user, sizeof sess->sess_user, sess->sess_pass, sizeof sess->sess_pass,
257: &sess->sess_will.topic, &sess->sess_will.msg);
258: ret = cack.retcode;
259: flg.flags = cack.reserved;
260: if (flg.reserved) {
261: ioDEBUG(3, "Error:: in MQTT protocol #%d - %s", mqtt_GetErrno(), mqtt_GetError());
262: goto end;
263: } else {
264: sess->sess_clean = flg.clean_sess;
265: sess->sess_will.qos = flg.will_qos;
266: sess->sess_will.retain = flg.will_retain;
267: sess->sess_will.flag = flg.will_flg;
268:
269: sess->sess_srv->timeout = sess->sess_ka;
270: }
271:
272: /* check online table for user */
273: if (call.LoginACC(&cfg, acc, sess->sess_user, sess->sess_pass) < 1) {
274: ioDEBUG(0, "Login:: DENIED for username %s and password %s",
275: sess->sess_user, sess->sess_pass);
276: ret = MQTT_RETCODE_DENIED;
277: goto end;
278: } else {
279: ioDEBUG(1, "Login:: ALLOWED for username %s ...", sess->sess_user);
280: ret = MQTT_RETCODE_ACCEPTED;
281: }
282:
283: /* db management */
284: if (call.FiniSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, "%") > 0) {
285: ioDEBUG(2, "Old session %s should be disconnect!", sess->sess_cid);
286: TAILQ_FOREACH(s, &Sessions, sess_node)
287: if (!strcmp(s->sess_cid, sess->sess_cid)) {
288: /* found stale session & disconnect it! */
289: sock = s->sess_sock;
290: schedCancelby(root, taskMAX, CRITERIA_FD, (void*) sock, NULL);
291: schedWrite(root, leaveClient, s, s->sess_sock, NULL, 0);
292: break;
293: }
294: }
295: if (call.InitSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, sess->sess_addr,
296: sess->sess_will.flag, sess->sess_will.topic, sess->sess_will.msg,
297: sess->sess_will.qos, sess->sess_will.retain) == -1) {
298: ioDEBUG(0, "Session %s DENIED for username %s", sess->sess_cid, sess->sess_user);
299: ret = MQTT_RETCODE_DENIED;
300: goto end;
301: } else {
302: ioDEBUG(0, "Session %s from %s and username %s is started",
303: sess->sess_cid, sess->sess_addr, sess->sess_user);
304: ret = MQTT_RETCODE_ACCEPTED;
305: }
306: /* clean/load session if requested */
307: if (sess->sess_clean) {
308: if (call.DeletePUB_subscribe)
309: call.DeletePUB_subscribe(&cfg, pub, sess->sess_cid, "%", sess->sess_user, "%");
310: if (call.WipePUB_topic) /* delete ALL messages */
311: call.WipePUB_topic(&cfg, pub, sess->sess_cid, sess->sess_user, -1);
312: } else if (call.ReadPUB_subscribe) {
313: /* load subscribes */
314: subs = call.ReadPUB_subscribe(&cfg, pub, sess->sess_cid, "%");
315: loadSubscribes(sess, subs);
316: mqtt_subFree(&subs);
317: }
318:
319: /* timer event for retain messages */
320: if (call.ReadPUB_topic)
321: schedTimer(root, sendRetain, sess, ts, NULL, 0);
322:
323: /* Start session task OK ... */
324: if (!schedRead(root, dispatchSession, sess, TASK_FD(task), NULL, 0)) {
325: ioLIBERR(sched);
326: ret = MQTT_RETCODE_DENIED;
327: } else
328: TAILQ_INSERT_TAIL(&Sessions, sess, sess_node);
329:
330: call.LOG(logg, "Session %s started from %s for user %s (timeout=%d) OK!\n", sess->sess_cid,
331: sess->sess_addr, sess->sess_user, sess->sess_ka);
332: end: /* close client connection */
333: wlen = mqtt_msgCONNACK(sess->sess_buf, ret);
334: if ((wlen = send(TASK_FD(task), sess->sess_buf->msg_base, wlen, 0)) == -1) {
335: ioDEBUG(3, "Error:: send(%ld) #%d - %s", (long) TASK_FD(task), errno, strerror(errno));
336: } else
337: ioDEBUG(5, "Sended %d bytes", wlen);
338:
339: if (ret != MQTT_RETCODE_ACCEPTED) {
340: ioDEBUG(1, "Close client %s with socket=%ld", sess->sess_addr, (long) TASK_FD(task));
341: finiSession(sess);
342: }
343: return NULL;
344: }
345:
346: static void *
347: acceptClient(sched_task_t *task)
348: {
349: int cli;
350: io_sockaddr_t sa;
351: socklen_t sslen = sizeof sa.ss;
352: ait_val_t *v;
353: char str[STRSIZ];
354:
355: ioTRACE(4);
356:
357: assert(task);
358:
359: if ((cli = accept(TASK_FD(task), &sa.sa, &sslen)) == -1)
360: goto end;
361:
362: v = io_allocVar();
363: if (!v) {
364: ioLIBERR(io);
365: close(cli);
366: goto end;
367: } else {
368: memset(str, 0, sizeof str);
369: snprintf(str, sizeof str, "%s:%hu", io_n2addr(&sa, v), io_n2port(&sa));
370: AIT_FREE_VAL(v);
371: AIT_SET_STR(v, str);
372: }
373: ioDEBUG(1, "Connected client with socket=%d from %s", cli, AIT_GET_STR(v));
374:
375: if (!schedRead(root, startSession, v, cli, NULL, 0)) {
376: io_freeVar(&v);
377: close(cli);
378: ioDEBUG(1, "Terminated client with socket=%d", cli);
379: }
380: end:
381: if (!schedRead(root, acceptClient, NULL, TASK_FD(task), NULL, 0))
382: ioLIBERR(sched);
383: return NULL;
384: }
385:
386: /* ----------------------------------------------------------------------- */
387:
388: int
389: Run(int sock)
390: {
391: struct tagSession *sess;
392: struct timespec pl = { 0, 100000000 };
393:
394: ioTRACE(1);
395:
396: if (mqtt_srv_Listen(sock, 0, 1) == -1) {
397: ioLIBERR(mqtt);
398: return -1;
399: }
400:
401: /* state machine - accept new connections */
402: if (!schedRead(root, acceptClient, NULL, sock, NULL, 0)) {
403: ioLIBERR(sched);
404: return -1;
405: }
406:
407: schedPolling(root, &pl, NULL);
408: schedRun(root, &Kill);
409:
410: schedCancelby(root, taskTIMER, CRITERIA_CALL, sendRetain, NULL);
411:
412: /* free all undeleted elements into lists */
413: TAILQ_FOREACH(sess, &Sessions, sess_node) {
414: TAILQ_REMOVE(&Sessions, sess, sess_node);
415:
416: finiSession(sess);
417: }
418: return 0;
419: }
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