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 = 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: 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: 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: 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: 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: struct tagSession *s, *sess = NULL;
190: int ret, wlen;
191:
192: ioTRACE(4);
193:
194: assert(task);
195:
196: if (!TASK_DATA(task)) {
197: /* flow from accept new clients */
198: sess = initSession(TASK_FD(task), TASK_ARG(task));
199: io_freeVar(TASK_ARG(task));
200: if (!sess) {
201: close(TASK_FD(task));
202: return NULL;
203: }
204:
205: /* receive & decode packet */
206: if (recv(sess->sess_sock, buf.msg_base, buf.msg_len, 0) == -1) {
207: ioDEBUG(3, "Error:: recv(%d) #%d - %s", sess->sess_sock, errno, strerror(errno));
208: finiSession(sess);
209: return NULL;
210: }
211: } else {
212: sess = TASK_DATA(task);
213: assert(sess);
214:
215: buf.msg_len = TASK_DATLEN(task) > sizeof basebuf ? sizeof basebuf : TASK_DATLEN(task);
216: memcpy(buf.msg_base, sess->sess_buf->msg_base, buf.msg_len);
217: }
218:
219: cack = mqtt_readCONNECT(&buf, &sess->sess_ka, sess->sess_cid, sizeof sess->sess_cid,
220: sess->sess_user, sizeof sess->sess_user, sess->sess_pass, sizeof sess->sess_pass,
221: &sess->sess_will.topic, &sess->sess_will.msg);
222: ret = cack.retcode;
223: flg.flags = cack.reserved;
224: if (flg.reserved) {
225: ioDEBUG(3, "Error:: in MQTT protocol #%d - %s", mqtt_GetErrno(), mqtt_GetError());
226: goto end;
227: } else {
228: sess->sess_clean = flg.clean_sess;
229: sess->sess_will.qos = flg.will_qos;
230: sess->sess_will.retain = flg.will_retain;
231: sess->sess_will.flag = flg.will_flg;
232:
233: sess->sess_srv->timeout = sess->sess_ka;
234: }
235:
236: /* check online table for user */
237: if (call.LoginACC(&cfg, acc, sess->sess_user, sess->sess_pass) < 1) {
238: ioDEBUG(0, "Login:: DENIED for username %s and password %s",
239: sess->sess_user, sess->sess_pass);
240: ret = MQTT_RETCODE_DENIED;
241: goto end;
242: } else {
243: ioDEBUG(1, "Login:: ALLOWED for username %s ...", sess->sess_user);
244: ret = MQTT_RETCODE_ACCEPTED;
245: }
246:
247: if (call.FiniSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, "%") > 0) {
248: ioDEBUG(2, "Old session %s should be disconnect!", sess->sess_cid);
249: TAILQ_FOREACH(s, &Sessions, sess_node)
250: if (!strcmp(s->sess_cid, sess->sess_cid)) {
251: /* found stale session & disconnect it! */
252: schedWrite(root, leaveClient, sess, TASK_FD(task), NULL, 0);
253: break;
254: }
255: }
256:
257: if (call.InitSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, sess->sess_addr,
258: sess->sess_will.flag, sess->sess_will.topic, sess->sess_will.msg,
259: sess->sess_will.qos, sess->sess_will.retain) == -1) {
260: ioDEBUG(0, "Session %s DENIED for username %s", sess->sess_cid, sess->sess_user);
261: ret = MQTT_RETCODE_DENIED;
262: goto end;
263: } else {
264: ioDEBUG(0, "Session %s from %s and username %s is started",
265: sess->sess_cid, sess->sess_addr, sess->sess_user);
266: ret = MQTT_RETCODE_ACCEPTED;
267: }
268:
269: /* Start session task OK ... */
270: if (!schedRead(root, dispatchSession, sess, TASK_FD(task), NULL, 0)) {
271: ioLIBERR(sched);
272: ret = MQTT_RETCODE_DENIED;
273: } else
274: TAILQ_INSERT_TAIL(&Sessions, sess, sess_node);
275:
276: call.LOG(logg, "Session %s started from %s for user %s (timeout=%d) OK!\n", sess->sess_cid,
277: sess->sess_addr, sess->sess_user, sess->sess_ka);
278: end: /* close client connection */
279: wlen = mqtt_msgCONNACK(sess->sess_buf, ret);
280: if ((wlen = send(TASK_FD(task), sess->sess_buf->msg_base, wlen, 0)) == -1) {
281: ioDEBUG(3, "Error:: send(%d) #%d - %s", TASK_FD(task), errno, strerror(errno));
282: } else
283: ioDEBUG(5, "Sended %d bytes", wlen);
284:
285: if (ret != MQTT_RETCODE_ACCEPTED) {
286: ioDEBUG(1, "Close client %s with socket=%d", sess->sess_addr, TASK_FD(task));
287: finiSession(sess);
288: }
289: return NULL;
290: }
291:
292: static void *
293: acceptClient(sched_task_t *task)
294: {
295: int cli;
296: io_sockaddr_t sa;
297: socklen_t sslen = sizeof sa.ss;
298: ait_val_t *v;
299: char str[STRSIZ];
300:
301: ioTRACE(4);
302:
303: assert(task);
304:
305: if ((cli = accept(TASK_FD(task), &sa.sa, &sslen)) == -1)
306: goto end;
307: else
308: fcntl(cli, F_SETFL, fcntl(cli, F_GETFL, 0) | O_NONBLOCK);
309:
310: v = io_allocVar();
311: if (!v) {
312: ioLIBERR(io);
313: close(cli);
314: goto end;
315: } else {
316: memset(str, 0, sizeof str);
317: snprintf(str, sizeof str, "%s:%hu", io_n2addr(&sa, v), io_n2port(&sa));
318: AIT_FREE_VAL(v);
319: AIT_SET_STR(v, str);
320: }
321: ioDEBUG(1, "Connected client with socket=%d from %s", cli, AIT_GET_STR(v));
322:
323: if (!schedRead(root, startSession, v, cli, NULL, 0)) {
324: io_freeVar(v);
325: close(cli);
326: ioDEBUG(1, "Terminated client with socket=%d", cli);
327: }
328: end:
329: if (!schedRead(root, acceptClient, NULL, TASK_FD(task), NULL, 0))
330: ioLIBERR(sched);
331: return NULL;
332: }
333:
334: /* ----------------------------------------------------------------------- */
335:
336: int
337: Run(int sock)
338: {
339: struct tagPub *pub;
340: struct tagSession *sess;
341: struct timespec pl = { 0, 100000000 };
342:
343: ioTRACE(1);
344:
345: if (listen(sock, SOMAXCONN) == -1) {
346: ioSYSERR(0);
347: return -1;
348: } else
349: fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
350:
351: /* state machine - accept new connections */
352: if (!schedRead(root, acceptClient, NULL, sock, NULL, 0)) {
353: ioLIBERR(sched);
354: return -1;
355: }
356:
357: schedPolling(root, &pl, NULL);
358: schedRun(root, &Kill);
359:
360: /* free all undeleted elements into lists */
361: TAILQ_FOREACH(pub, &Pubs, pub_node) {
362: TAILQ_REMOVE(&Pubs, pub, pub_node);
363:
364: AIT_FREE_VAL(&pub->pub_name);
365: if (pub->pub_packet.msg_base)
366: free(pub->pub_packet.msg_base);
367: }
368: TAILQ_FOREACH(sess, &Sessions, sess_node) {
369: TAILQ_REMOVE(&Sessions, sess, sess_node);
370:
371: finiSession(sess);
372: }
373: return 0;
374: }
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