Annotation of libaitmqtt/src/cliside.c, revision 1.1.2.7
1.1.2.2 misho 1: /*************************************************************************
2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
1.1.2.7 ! misho 6: * $Id: cliside.c,v 1.1.2.6 2012/05/09 13:48:31 misho Exp $
1.1.2.2 misho 7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
1.1.2.1 misho 46: #include "global.h"
47:
48:
1.1.2.3 misho 49: /*
50: * mqtt_cli_Open() - Open client connection to MQTT broker
51: *
52: * @addr = brokers address
1.1.2.4 misho 53: * @timeout = timeout
1.1.2.3 misho 54: * return: NULL error or !=NULL connected to broker
55: */
56: mqtt_cli_t *
1.1.2.4 misho 57: mqtt_cli_Open(struct sockaddr *addr, u_short timeout)
1.1.2.3 misho 58: {
59: mqtt_cli_t *cli;
60:
61: if (!addr)
62: return NULL;
63:
64: cli = malloc(sizeof(mqtt_cli_t));
65: if (!cli) {
66: LOGERR;
67: return NULL;
68: } else
69: memset(cli, 0, sizeof(mqtt_cli_t));
70:
1.1.2.4 misho 71: cli->timeout = timeout;
1.1.2.3 misho 72: cli->sock = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
73: if (cli->sock == -1) {
74: LOGERR;
75: free(cli);
76: return NULL;
77: }
78: if (connect(cli->sock, addr, addr->sa_len) == -1) {
79: LOGERR;
80: close(cli->sock);
81: free(cli);
82: return NULL;
83: }
84:
85: cli->buf = mqtt_msgAlloc(USHRT_MAX);
86: if (!cli->buf) {
87: close(cli->sock);
88: free(cli);
89: return NULL;
90: }
91:
92: return cli;
93: }
94:
95: /*
96: * mqtt_cli_Close() - Close client connection
97: *
98: * @cli = connected client
99: * return: -1 error or 0 disconnected client and freed all resources
100: */
101: int
102: mqtt_cli_Close(mqtt_cli_t ** __restrict cli)
103: {
104: int siz = 0;
105:
106: if (!cli || !*cli)
107: return -1;
108:
109: /* send disconnect */
110: siz = mqtt_msgDISCONNECT((*cli)->buf);
111: if (siz > -1) {
112: siz = send((*cli)->sock, (*cli)->buf->msg_base, siz, MSG_NOSIGNAL);
113: if (siz > -1)
114: shutdown((*cli)->sock, SHUT_RDWR);
115: }
116: close((*cli)->sock);
117:
118: mqtt_msgFree(&(*cli)->buf, 42);
119:
120: free(*cli);
121: *cli = NULL;
122: return 0;
123: }
1.1.2.4 misho 124:
125: /*
126: * mqtt_cli_Subscribe() - Subscribe to broker
127: *
128: * @cli = connected client
129: * @Topics = Topics for subscribes
130: * @msgID = Message ID
131: * @Dup = Duplicated request
132: * @QoS = Message QoS
133: * return: NULL error or !=NULL allocated array with subscribed QoS responses,
134: * must be free() result!
135: */
136: u_char *
137: mqtt_cli_Subscribe(mqtt_cli_t * __restrict cli, mqtt_subscr_t * __restrict Topics,
138: u_short msgID, u_char Dup, u_char QoS)
139: {
140: int siz = 0;
141: u_short mid = 0;
142: u_char *qoses = NULL;
143:
1.1.2.5 misho 144: if (!cli || !Topics)
1.1.2.4 misho 145: return NULL;
146:
147: /* send subscribe */
148: siz = mqtt_msgSUBSCRIBE(cli->buf, Topics, msgID, Dup, QoS);
149: if (siz == -1)
150: return NULL;
151: siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
152: if (siz == -1) {
153: LOGERR;
154: return NULL;
155: }
156:
157: if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
158: return NULL;
159: } else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1))
160: return NULL;
161:
162: /* receive suback */
163: siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
164: if (siz == -1) {
165: LOGERR;
166: return NULL;
167: }
168: siz = mqtt_readSUBACK(cli->buf, &mid, &qoses);
169: if (siz == -1)
170: return NULL;
171: if (msgID != mid) {
172: free(qoses);
1.1.2.7 ! misho 173: mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, mid);
1.1.2.4 misho 174: return NULL;
175: }
176:
177: return qoses;
178: }
1.1.2.5 misho 179:
180: /*
181: * mqtt_cli_Unsubscribe() - Unsubscribe from broker
182: *
183: * @cli = connected client
184: * @Topics = Topics for unsubscribes
185: * @msgID = Message ID
186: * @Dup = Duplicated request
187: * @QoS = Message QoS
188: * return: -1 error or 0 ok
189: */
190: int
191: mqtt_cli_Unsubscribe(mqtt_cli_t * __restrict cli, mqtt_subscr_t * __restrict Topics,
192: u_short msgID, u_char Dup, u_char QoS)
193: {
194: int siz = 0;
195:
196: if (!cli || !Topics)
197: return -1;
198:
199: /* send unsubscribe */
200: siz = mqtt_msgUNSUBSCRIBE(cli->buf, Topics, msgID, Dup, QoS);
201: if (siz == -1)
202: return -1;
203: siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
204: if (siz == -1) {
205: LOGERR;
206: return -1;
207: }
208:
209: if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
210: return -1;
211: } else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1))
212: return -1;
213:
214: /* receive unsuback */
215: siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
216: if (siz == -1) {
217: LOGERR;
218: return -1;
219: }
220: siz = mqtt_readUNSUBACK(cli->buf);
221: if (siz == -1)
222: return -1;
223: if (msgID != siz) {
1.1.2.7 ! misho 224: mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
1.1.2.6 misho 225: return -1;
226: }
227:
228: return 0;
229: }
230:
231: /*
232: * mqtt_cli_Publish() - Publish message to broker
233: *
234: * @cli = connected client
235: * @msgID = Message ID
236: * @Dup = Duplicated request
237: * @QoS = Message QoS
238: * @Retain = Retain message
239: * @csTopic = Topic
240: * @pData = Data
241: * @datLen = Data length
242: * return: -1 error or 0 ok
243: */
244: int
245: mqtt_cli_Publish(mqtt_cli_t * __restrict cli, u_short msgID, u_char Dup, u_char QoS, u_char Retain,
246: const char *csTopic, const void *pData, int datLen)
247: {
248: int siz = 0;
249:
250: if (!cli || !csTopic)
251: return -1;
252:
253: /* send publish */
254: siz = mqtt_msgPUBLISH(cli->buf, csTopic, msgID, Dup, QoS, Retain, pData, datLen);
255: if (siz == -1)
256: return -1;
257: siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
258: if (siz == -1) {
259: LOGERR;
1.1.2.5 misho 260: return -1;
261: }
262:
1.1.2.6 misho 263: if (QoS == MQTT_QOS_ONCE) /* no reply */
264: goto end;
265:
266: if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
267: return -1;
268: } else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1))
269: return -1;
270:
271: /* receive PUBxxx */
272: siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
273: if (siz == -1) {
274: LOGERR;
275: return -1;
276: }
277:
278: if (QoS == MQTT_QOS_ACK) { /* reply with PUBACK */
279: siz = mqtt_readPUBACK(cli->buf);
280: if (siz == -1)
281: return -1;
282: if (msgID != siz) {
1.1.2.7 ! misho 283: mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
1.1.2.6 misho 284: return -1;
285: }
286: goto end;
287: } else { /* reply with PUBREC */
288: siz = mqtt_readPUBREC(cli->buf);
289: if (siz == -1)
290: return -1;
291: if (msgID != siz) {
1.1.2.7 ! misho 292: mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
1.1.2.6 misho 293: return -1;
294: }
295: }
296:
297: do {
298: /* send publish release QoS == 2 */
299: siz = mqtt_msgPUBREL(cli->buf, msgID);
300: if (siz == -1)
301: return -1;
302: siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
303: if (siz == -1) {
304: LOGERR;
305: return -1;
306: }
307:
308: if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
309: return -1;
310: } else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1)) {
311: if (Dup++ > 1)
312: return -1;
313: else
314: continue;
315: }
316:
317: /* receive PUBCOMP */
318: siz = mqtt_readPUBCOMP(cli->buf);
319: if (siz == -1)
320: return -1;
321: if (msgID != siz) {
1.1.2.7 ! misho 322: mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
1.1.2.6 misho 323: if (Dup++ > 1)
324: return -1;
325: else
326: continue;
327: }
328: } while (0);
329:
330: end:
1.1.2.5 misho 331: return 0;
332: }
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