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 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_Init(sock, sess->sess_buf, sess->sess_ka);
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.msg)
94: free(sess->sess_will.msg);
95: if (sess->sess_will.topic)
96: free(sess->sess_will.topic);
97:
98: if (sess->sess_sock > STDERR_FILENO)
99: srv_Close(sess->sess_sock);
100:
101: mqtt_srv_Fini(&sess->sess_srv);
102: mqtt_msgFree(&sess->sess_buf, 42);
103:
104: io_free(sess);
105: }
106:
107: static void *
108: leaveClient(sched_task_t *task)
109: {
110: struct tagSession *sess;
111: int ret;
112:
113: ioTRACE(4);
114:
115: assert(task);
116:
117: sess = TASK_ARG(task);
118: assert(sess);
119:
120: TAILQ_REMOVE(&Sessions, sess, sess_node);
121:
122: ret = mqtt_msgDISCONNECT(sess->sess_buf);
123: send(TASK_FD(task), sess->sess_buf->msg_base, ret, MSG_NOSIGNAL);
124:
125: ioDEBUG(1, "Close socket=%d", TASK_FD(task));
126: call.LOG(logg, "Session %s stopped from %s for user %s.\n", sess->sess_cid,
127: sess->sess_addr, sess->sess_user);
128:
129: finiSession(sess);
130: return NULL;
131: }
132:
133: static void *
134: dispatchSession(sched_task_t *task)
135: {
136: int ret, len = 0;
137: struct tagSession *sess;
138:
139: ioTRACE(2);
140:
141: assert(task);
142:
143: sess = TASK_ARG(task);
144: assert(sess);
145:
146: /* receive & decode packet */
147: if ((ret = recv(TASK_FD(task), sess->sess_buf->msg_base, sess->sess_buf->msg_len, 0)) == -1) {
148: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
149: TAILQ_REMOVE(&Sessions, sess, sess_node);
150: finiSession(sess);
151: return NULL;
152: } else if (!ret) {
153: ioDEBUG(4, "Session %s EOF received.", sess->sess_cid);
154: TAILQ_REMOVE(&Sessions, sess, sess_node);
155: finiSession(sess);
156: return NULL;
157: }
158:
159: do {
160: /* dispatch message type */
161: if ((len = mqtt_srv_Dispatch(sess->sess_srv, ret, sess)) < 0) {
162: if (len == -1) {
163: ioLIBERR(mqtt);
164: finiSession(sess);
165: } else if (len == -2) {
166: TAILQ_REMOVE(&Sessions, sess, sess_node);
167: finiSession(sess);
168: } else if (len == -3)
169: schedEvent(root, startSession, NULL, (u_long) TASK_FD(task), sess, ret);
170: } else
171: ret -= len;
172: } while (len > 0 && ret > 0);
173:
174: if (len >= 0 && !schedRead(root, dispatchSession, TASK_ARG(task), TASK_FD(task), NULL, 0)) {
175: ioLIBERR(sched);
176: TAILQ_REMOVE(&Sessions, sess, sess_node);
177: finiSession(sess);
178: }
179: return NULL;
180: }
181:
182: void *
183: startSession(sched_task_t *task)
184: {
185: u_char basebuf[USHRT_MAX];
186: mqtt_msg_t buf = { basebuf, sizeof basebuf };
187: mqtthdr_connflgs_t flg;
188: mqtthdr_connack_t cack;
189: ait_val_t *v;
190: struct tagSession *s, *sess = NULL;
191: int ret, wlen;
192:
193: ioTRACE(4);
194:
195: assert(task);
196:
197: if (!TASK_DATA(task)) {
198: v = TASK_ARG(task);
199: /* flow from accept new clients */
200: sess = initSession(TASK_FD(task), v);
201: io_freeVar(&v);
202: if (!sess) {
203: close(TASK_FD(task));
204: return NULL;
205: }
206:
207: /* receive & decode packet */
208: if (recv(sess->sess_sock, buf.msg_base, buf.msg_len, 0) == -1) {
209: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
210: finiSession(sess);
211: return NULL;
212: }
213: } else {
214: sess = TASK_DATA(task);
215: assert(sess);
216:
217: buf.msg_len = TASK_DATLEN(task) > sizeof basebuf ? sizeof basebuf : TASK_DATLEN(task);
218: memcpy(buf.msg_base, sess->sess_buf->msg_base, buf.msg_len);
219: }
220:
221: cack = mqtt_readCONNECT(&buf, &sess->sess_ka, sess->sess_cid, sizeof sess->sess_cid,
222: sess->sess_user, sizeof sess->sess_user, sess->sess_pass, sizeof sess->sess_pass,
223: &sess->sess_will.topic, &sess->sess_will.msg);
224: ret = cack.retcode;
225: flg.flags = cack.reserved;
226: if (flg.reserved) {
227: ioDEBUG(3, "Error:: in MQTT protocol #%d - %s", mqtt_GetErrno(), mqtt_GetError());
228: goto end;
229: } else {
230: sess->sess_clean = flg.clean_sess;
231: sess->sess_will.qos = flg.will_qos;
232: sess->sess_will.retain = flg.will_retain;
233: sess->sess_will.flag = flg.will_flg;
234:
235: sess->sess_srv->timeout = sess->sess_ka;
236: }
237:
238: /* check online table for user */
239: if (call.LoginACC(&cfg, acc, sess->sess_user, sess->sess_pass) < 1) {
240: ioDEBUG(0, "Login:: DENIED for username %s and password %s",
241: sess->sess_user, sess->sess_pass);
242: ret = MQTT_RETCODE_DENIED;
243: goto end;
244: } else {
245: ioDEBUG(1, "Login:: ALLOWED for username %s ...", sess->sess_user);
246: ret = MQTT_RETCODE_ACCEPTED;
247: }
248:
249: /* db management */
250: if (call.FiniSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, "%") > 0) {
251: ioDEBUG(2, "Old session %s should be disconnect!", sess->sess_cid);
252: TAILQ_FOREACH(s, &Sessions, sess_node)
253: if (!strcmp(s->sess_cid, sess->sess_cid)) {
254: /* found stale session & disconnect it! */
255: schedWrite(root, leaveClient, sess, TASK_FD(task), NULL, 0);
256: break;
257: }
258: }
259: if (call.InitSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, sess->sess_addr,
260: sess->sess_will.flag, sess->sess_will.topic, sess->sess_will.msg,
261: sess->sess_will.qos, sess->sess_will.retain) == -1) {
262: ioDEBUG(0, "Session %s DENIED for username %s", sess->sess_cid, sess->sess_user);
263: ret = MQTT_RETCODE_DENIED;
264: goto end;
265: } else {
266: ioDEBUG(0, "Session %s from %s and username %s is started",
267: sess->sess_cid, sess->sess_addr, sess->sess_user);
268: ret = MQTT_RETCODE_ACCEPTED;
269: }
270: /* clean/load session if requested */
271: if (sess->sess_clean) {
272: if (call.DeletePUB_subscribe)
273: call.DeletePUB_subscribe(&cfg, pub, sess->sess_cid, "%", sess->sess_user, "%");
274: if (call.WipePUB_topic)
275: call.WipePUB_topic(&cfg, pub, sess->sess_cid, sess->sess_user, -1);
276: } else {
277: // todo: read_sql subs and prepare publish
278: }
279:
280: /* Start session task OK ... */
281: if (!schedRead(root, dispatchSession, sess, TASK_FD(task), NULL, 0)) {
282: ioLIBERR(sched);
283: ret = MQTT_RETCODE_DENIED;
284: } else
285: TAILQ_INSERT_TAIL(&Sessions, sess, sess_node);
286:
287: call.LOG(logg, "Session %s started from %s for user %s (timeout=%d) OK!\n", sess->sess_cid,
288: sess->sess_addr, sess->sess_user, sess->sess_ka);
289: end: /* close client connection */
290: wlen = mqtt_msgCONNACK(sess->sess_buf, ret);
291: if ((wlen = send(TASK_FD(task), sess->sess_buf->msg_base, wlen, 0)) == -1) {
292: ioDEBUG(3, "Error:: send(%d) #%d - %s", TASK_FD(task), errno, strerror(errno));
293: } else
294: ioDEBUG(5, "Sended %d bytes", wlen);
295:
296: if (ret != MQTT_RETCODE_ACCEPTED) {
297: ioDEBUG(1, "Close client %s with socket=%d", sess->sess_addr, TASK_FD(task));
298: finiSession(sess);
299: }
300: return NULL;
301: }
302:
303: static void *
304: acceptClient(sched_task_t *task)
305: {
306: int cli;
307: io_sockaddr_t sa;
308: socklen_t sslen = sizeof sa.ss;
309: ait_val_t *v;
310: char str[STRSIZ];
311:
312: ioTRACE(4);
313:
314: assert(task);
315:
316: if ((cli = accept(TASK_FD(task), &sa.sa, &sslen)) == -1)
317: goto end;
318: else
319: fcntl(cli, F_SETFL, fcntl(cli, F_GETFL, 0) | O_NONBLOCK);
320:
321: v = io_allocVar();
322: if (!v) {
323: ioLIBERR(io);
324: close(cli);
325: goto end;
326: } else {
327: memset(str, 0, sizeof str);
328: snprintf(str, sizeof str, "%s:%hu", io_n2addr(&sa, v), io_n2port(&sa));
329: AIT_FREE_VAL(v);
330: AIT_SET_STR(v, str);
331: }
332: ioDEBUG(1, "Connected client with socket=%d from %s", cli, AIT_GET_STR(v));
333:
334: if (!schedRead(root, startSession, v, cli, NULL, 0)) {
335: io_freeVar(&v);
336: close(cli);
337: ioDEBUG(1, "Terminated client with socket=%d", cli);
338: }
339: end:
340: if (!schedRead(root, acceptClient, NULL, TASK_FD(task), NULL, 0))
341: ioLIBERR(sched);
342: return NULL;
343: }
344:
345: /* ----------------------------------------------------------------------- */
346:
347: int
348: Run(int sock)
349: {
350: struct tagSession *sess;
351: struct timespec pl = { 0, 100000000 };
352:
353: ioTRACE(1);
354:
355: if (listen(sock, SOMAXCONN) == -1) {
356: ioSYSERR(0);
357: return -1;
358: } else
359: fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
360:
361: /* state machine - accept new connections */
362: if (!schedRead(root, acceptClient, NULL, sock, NULL, 0)) {
363: ioLIBERR(sched);
364: return -1;
365: }
366:
367: schedPolling(root, &pl, NULL);
368: schedRun(root, &Kill);
369:
370: /* free all undeleted elements into lists */
371: TAILQ_FOREACH(sess, &Sessions, sess_node) {
372: TAILQ_REMOVE(&Sessions, sess, sess_node);
373:
374: finiSession(sess);
375: }
376: return 0;
377: }
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