Annotation of libaitmqtt/src/pub.c, revision 1.1.1.1.2.3
1.1 misho 1: /*************************************************************************
2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
1.1.1.1.2.3! misho 6: * $Id: pub.c,v 1.1.1.1.2.2 2012/04/26 12:33:14 misho Exp $
1.1 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:
1.1.1.1.2.1 misho 15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
1.1 misho 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: */
46: #include "global.h"
47:
48:
49: /*
50: * mqtt_msgPUBLISH() Create PUBLISH message
51: *
52: * @buf = Message buffer
53: * @csTopic = Publish topic
54: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
55: * @Dup = Duplicate message
56: * @QOS = QoS
57: * @Retain = Retain message
58: * @pData = Publish data into topic
59: * @datlen = Publish data length
60: * return: -1 error or >-1 message size for send
61: */
62: int
63: mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic, u_short msgID,
64: u_char Dup, u_char QOS, u_char Retain, const void *pData, int datlen)
65: {
66: int siz = 0;
67: struct mqtthdr *hdr;
68: mqtthdr_var_t *topic;
69: mqtt_len_t *mid;
70: void *data;
71:
72: if (!buf || !csTopic)
73: return -1;
74: if (QOS > MQTT_QOS_EXACTLY) {
1.1.1.1.2.1 misho 75: mqtt_SetErr(EINVAL, "Invalid QoS parameter");
1.1 misho 76: return -1;
77: }
78: if (!msgID && QOS != MQTT_QOS_ONCE) {
1.1.1.1.2.1 misho 79: mqtt_SetErr(EINVAL, "Invalid MessageID parameter must be >0");
1.1 misho 80: return -1;
81: }
82:
83: if (mqtt_msgRealloc(buf, MQTTMSG_MAX) == -1)
84: return -1;
85: else {
86: hdr = (struct mqtthdr *) (buf->msg_base + siz);
87: siz += sizeof(struct mqtthdr);
88: }
89:
90: /* variable header */
91: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
92: topic->var_sb.val = htons(strlen(csTopic));
93: memcpy(topic->var_data, csTopic, ntohs(topic->var_sb.val));
94: siz += MQTTHDR_VAR_SIZEOF(topic);
95:
96: mid = (mqtt_len_t*) (buf->msg_base + siz);
97: mid->val = htons(msgID);
98: siz += sizeof(mqtt_len_t);
99:
100: /* load with data */
101: if (pData && datlen) {
102: data = buf->msg_base + siz;
103: memcpy(data, pData, datlen);
104: siz += datlen;
105: }
106:
107: /* fixed header */
108: MQTTHDR_MSGINIT(hdr);
109: hdr->mqtt_msg.type = MQTT_TYPE_PUBLISH;
110: hdr->mqtt_msg.qos = QOS;
111: hdr->mqtt_msg.dup = Dup ? 1 : 0;
112: hdr->mqtt_msg.retain = Retain ? 1 : 0;
113: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
114:
115: return siz;
116: }
117:
118: static int
119: _mqtt_msgPUB_(mqtt_msg_t * __restrict buf, u_char cmd, u_short msgID)
120: {
121: int siz = 0;
122: struct mqtthdr *hdr;
123: mqtt_len_t *v;
124:
125: if (!buf)
126: return -1;
127:
128: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtt_len_t)) == -1)
129: return -1;
130: else {
131: hdr = (struct mqtthdr *) (buf->msg_base + siz);
132: siz += sizeof(struct mqtthdr);
133: v = (mqtt_len_t*) (buf->msg_base + siz);
134: siz += sizeof(mqtt_len_t);
135: }
136:
137: /* fixed header */
138: MQTTHDR_MSGINIT(hdr);
139: hdr->mqtt_msg.type = cmd;
140: *hdr->mqtt_len = sizeof(mqtt_len_t);
141:
142: /* MessageID */
143: v->val = htons(msgID);
144:
145: return siz;
146: }
147:
148: /*
149: * mqtt_msgPUBACK() Create PUBACK message
150: *
151: * @buf = Message buffer
152: * @msgID = MessageID
153: * return: -1 error or >-1 message size for send
154: */
155: inline int
156: mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, u_short msgID)
157: {
158: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBACK, msgID);
159: }
160:
161: /*
162: * mqtt_msgPUBREC() Create PUBREC message
163: *
164: * @buf = Message buffer
165: * @msgID = MessageID
166: * return: -1 error or >-1 message size for send
167: */
168: inline int
169: mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, u_short msgID)
170: {
171: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREC, msgID);
172: }
173:
174: /*
175: * mqtt_msgPUBREL() Create PUBREL message
176: *
177: * @buf = Message buffer
178: * @msgID = MessageID
179: * return: -1 error or >-1 message size for send
180: */
181: inline int
182: mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, u_short msgID)
183: {
184: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREL, msgID);
185: }
186:
187: /*
188: * mqtt_msgPUBCOMP() Create PUBCOMP message
189: *
190: * @buf = Message buffer
191: * @msgID = MessageID
192: * return: -1 error or >-1 message size for send
193: */
194: inline int
195: mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, u_short msgID)
196: {
197: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBCOMP, msgID);
198: }
199:
200:
201: /* ============= decode ============ */
202:
203: /*
204: * mqtt_readPUBLISH() Read PUBLISH message
205: *
206: * @buf = Message buffer
207: * @psTopic = Topic
208: * @topicLen = Topic length
209: * @msgID = MessageID
210: * @pData = Data buffer
211: * @datLen = Data buffer length, if *datLen == 0 allocate memory for pData
1.1.1.1.2.3! misho 212: * return: NULL error or !=NULL MQTT data buffer
1.1 misho 213: */
1.1.1.1.2.3! misho 214: void *
1.1 misho 215: mqtt_readPUBLISH(mqtt_msg_t * __restrict buf, char * __restrict psTopic, int topicLen,
216: u_short *msgID, void * __restrict pData, int *datLen)
217: {
218: int len, ret;
219: struct mqtthdr *hdr;
220: mqtthdr_var_t *var;
221: mqtt_len_t *v;
222: caddr_t pos;
223:
1.1.1.1.2.3! misho 224: if (!buf || !psTopic || !msgID)
1.1 misho 225: return NULL;
226:
227: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBLISH, &ret, &len);
228: if (!hdr)
229: return NULL;
230: pos = buf->msg_base + ret + 1;
231: var = (mqtthdr_var_t*) pos;
232:
233: /* topic */
234: len -= MQTTHDR_VAR_SIZEOF(var);
235: if (len < 0) {
1.1.1.1.2.1 misho 236: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 237: return NULL;
238: } else {
239: memset(psTopic, 0, topicLen--);
240: memcpy(psTopic, var->var_data, ntohs(var->var_sb.val) > topicLen ?
241: topicLen : ntohs(var->var_sb.val));
242: pos += MQTTHDR_VAR_SIZEOF(var);
243: v = (mqtt_len_t*) pos;
244: }
245:
246: len -= sizeof(mqtt_len_t);
247: if (len < 0) {
1.1.1.1.2.1 misho 248: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 249: return NULL;
250: } else {
251: *msgID = ntohs(v->val);
252: pos += sizeof(mqtt_len_t);
253: }
254:
255: /* data */
256: if (len < 0) {
1.1.1.1.2.1 misho 257: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 258: return NULL;
259: } else {
1.1.1.1.2.3! misho 260: if (!*datLen || !pData) {
! 261: if (!(pData = malloc(len + 1))) {
1.1 misho 262: LOGERR;
263: return NULL;
1.1.1.1.2.3! misho 264: } else {
1.1 misho 265: *datLen = len;
1.1.1.1.2.3! misho 266: ((char*) pData)[len] = 0;
! 267: }
1.1 misho 268: }
269:
270: memset(pData, 0, *datLen);
271: if (len < *datLen)
272: *datLen = len;
273: memcpy(pData, pos, *datLen);
274: }
275:
1.1.1.1.2.3! misho 276: return pData;
1.1 misho 277: }
278:
279: /*
280: * mqtt_readPUBACK() Read PUBACK message
281: *
282: * @buf = Message buffer
283: * return: -1 error or MessageID
284: */
285: u_short
286: mqtt_readPUBACK(mqtt_msg_t * __restrict buf)
287: {
288: int len, ret;
289: struct mqtthdr *hdr;
290: mqtt_len_t *v;
291: caddr_t pos;
292:
293: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBACK, &ret, &len);
294: if (!hdr)
295: return (u_short) -1;
296: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1 misho 297: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 298: return (u_short) -1;
299: } else {
300: pos = buf->msg_base + ret + 1;
301: v = (mqtt_len_t*) pos;
302: }
303:
304: return ntohs(v->val);
305: }
306:
307: /*
308: * mqtt_readPUBREC() Read PUBREC message
309: *
310: * @buf = Message buffer
311: * return: -1 error or MessageID
312: */
313: u_short
314: mqtt_readPUBREC(mqtt_msg_t * __restrict buf)
315: {
316: int len, ret;
317: struct mqtthdr *hdr;
318: mqtt_len_t *v;
319: caddr_t pos;
320:
321: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREC, &ret, &len);
322: if (!hdr)
323: return (u_short) -1;
324: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1 misho 325: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 326: return (u_short) -1;
327: } else {
328: pos = buf->msg_base + ret + 1;
329: v = (mqtt_len_t*) pos;
330: }
331:
332: return ntohs(v->val);
333: }
334:
335: /*
336: * mqtt_readPUBREL() Read PUBREL message
337: *
338: * @buf = Message buffer
339: * return: -1 error or MessageID
340: */
341: u_short
342: mqtt_readPUBREL(mqtt_msg_t * __restrict buf)
343: {
344: int len, ret;
345: struct mqtthdr *hdr;
346: mqtt_len_t *v;
347: caddr_t pos;
348:
349: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREL, &ret, &len);
350: if (!hdr)
351: return (u_short) -1;
352: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1 misho 353: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 354: return (u_short) -1;
355: } else {
356: pos = buf->msg_base + ret + 1;
357: v = (mqtt_len_t*) pos;
358: }
359:
360: return ntohs(v->val);
361: }
362:
363: /*
364: * mqtt_readPUBCOMP() Read PUBCOMP message
365: *
366: * @buf = Message buffer
367: * return: -1 error or MessageID
368: */
369: u_short
370: mqtt_readPUBCOMP(mqtt_msg_t * __restrict buf)
371: {
372: int len, ret;
373: struct mqtthdr *hdr;
374: mqtt_len_t *v;
375: caddr_t pos;
376:
377: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBCOMP, &ret, &len);
378: if (!hdr)
379: return (u_short) -1;
380: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1 misho 381: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 382: return (u_short) -1;
383: } else {
384: pos = buf->msg_base + ret + 1;
385: v = (mqtt_len_t*) pos;
386: }
387:
388: return ntohs(v->val);
389: }
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