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