Annotation of libaitmqtt/src/pub.c, revision 1.1.1.1.2.1
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 $
1.1.1.1.2.1! misho 6: * $Id: pub.c,v 1.1.1.1 2012/01/26 13:07:33 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: mqtt_msgRealloc(buf, siz);
116: return siz;
117: }
118:
119: static int
120: _mqtt_msgPUB_(mqtt_msg_t * __restrict buf, u_char cmd, u_short msgID)
121: {
122: int siz = 0;
123: struct mqtthdr *hdr;
124: mqtt_len_t *v;
125:
126: if (!buf)
127: return -1;
128:
129: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtt_len_t)) == -1)
130: return -1;
131: else {
132: hdr = (struct mqtthdr *) (buf->msg_base + siz);
133: siz += sizeof(struct mqtthdr);
134: v = (mqtt_len_t*) (buf->msg_base + siz);
135: siz += sizeof(mqtt_len_t);
136: }
137:
138: /* fixed header */
139: MQTTHDR_MSGINIT(hdr);
140: hdr->mqtt_msg.type = cmd;
141: *hdr->mqtt_len = sizeof(mqtt_len_t);
142:
143: /* MessageID */
144: v->val = htons(msgID);
145:
146: return siz;
147: }
148:
149: /*
150: * mqtt_msgPUBACK() Create PUBACK message
151: *
152: * @buf = Message buffer
153: * @msgID = MessageID
154: * return: -1 error or >-1 message size for send
155: */
156: inline int
157: mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, u_short msgID)
158: {
159: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBACK, msgID);
160: }
161:
162: /*
163: * mqtt_msgPUBREC() Create PUBREC message
164: *
165: * @buf = Message buffer
166: * @msgID = MessageID
167: * return: -1 error or >-1 message size for send
168: */
169: inline int
170: mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, u_short msgID)
171: {
172: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREC, msgID);
173: }
174:
175: /*
176: * mqtt_msgPUBREL() Create PUBREL message
177: *
178: * @buf = Message buffer
179: * @msgID = MessageID
180: * return: -1 error or >-1 message size for send
181: */
182: inline int
183: mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, u_short msgID)
184: {
185: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREL, msgID);
186: }
187:
188: /*
189: * mqtt_msgPUBCOMP() Create PUBCOMP message
190: *
191: * @buf = Message buffer
192: * @msgID = MessageID
193: * return: -1 error or >-1 message size for send
194: */
195: inline int
196: mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, u_short msgID)
197: {
198: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBCOMP, msgID);
199: }
200:
201:
202: /* ============= decode ============ */
203:
204: /*
205: * mqtt_readPUBLISH() Read PUBLISH message
206: *
207: * @buf = Message buffer
208: * @psTopic = Topic
209: * @topicLen = Topic length
210: * @msgID = MessageID
211: * @pData = Data buffer
212: * @datLen = Data buffer length, if *datLen == 0 allocate memory for pData
213: * return: NULL error or !=NULL MQTT fixed header
214: */
215: struct mqtthdr *
216: mqtt_readPUBLISH(mqtt_msg_t * __restrict buf, char * __restrict psTopic, int topicLen,
217: u_short *msgID, void * __restrict pData, int *datLen)
218: {
219: int len, ret;
220: struct mqtthdr *hdr;
221: mqtthdr_var_t *var;
222: mqtt_len_t *v;
223: caddr_t pos;
224:
225: if (!buf || !psTopic || !msgID || !pData)
226: return NULL;
227:
228: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBLISH, &ret, &len);
229: if (!hdr)
230: return NULL;
231: pos = buf->msg_base + ret + 1;
232: var = (mqtthdr_var_t*) pos;
233:
234: /* topic */
235: len -= MQTTHDR_VAR_SIZEOF(var);
236: if (len < 0) {
1.1.1.1.2.1! misho 237: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 238: return NULL;
239: } else {
240: memset(psTopic, 0, topicLen--);
241: memcpy(psTopic, var->var_data, ntohs(var->var_sb.val) > topicLen ?
242: topicLen : ntohs(var->var_sb.val));
243: pos += MQTTHDR_VAR_SIZEOF(var);
244: v = (mqtt_len_t*) pos;
245: }
246:
247: len -= sizeof(mqtt_len_t);
248: if (len < 0) {
1.1.1.1.2.1! misho 249: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 250: return NULL;
251: } else {
252: *msgID = ntohs(v->val);
253: pos += sizeof(mqtt_len_t);
254: }
255:
256: /* data */
257: if (len < 0) {
1.1.1.1.2.1! misho 258: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 259: return NULL;
260: } else {
261: if (!*datLen) {
262: if (!(pData = malloc(len))) {
263: LOGERR;
264: return NULL;
265: } else
266: *datLen = len;
267: }
268:
269: memset(pData, 0, *datLen);
270: if (len < *datLen)
271: *datLen = len;
272: memcpy(pData, pos, *datLen);
273: }
274:
275: return hdr;
276: }
277:
278: /*
279: * mqtt_readPUBACK() Read PUBACK message
280: *
281: * @buf = Message buffer
282: * return: -1 error or MessageID
283: */
284: u_short
285: mqtt_readPUBACK(mqtt_msg_t * __restrict buf)
286: {
287: int len, ret;
288: struct mqtthdr *hdr;
289: mqtt_len_t *v;
290: caddr_t pos;
291:
292: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBACK, &ret, &len);
293: if (!hdr)
294: return (u_short) -1;
295: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1! misho 296: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 297: return (u_short) -1;
298: } else {
299: pos = buf->msg_base + ret + 1;
300: v = (mqtt_len_t*) pos;
301: }
302:
303: return ntohs(v->val);
304: }
305:
306: /*
307: * mqtt_readPUBREC() Read PUBREC message
308: *
309: * @buf = Message buffer
310: * return: -1 error or MessageID
311: */
312: u_short
313: mqtt_readPUBREC(mqtt_msg_t * __restrict buf)
314: {
315: int len, ret;
316: struct mqtthdr *hdr;
317: mqtt_len_t *v;
318: caddr_t pos;
319:
320: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREC, &ret, &len);
321: if (!hdr)
322: return (u_short) -1;
323: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1! misho 324: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 325: return (u_short) -1;
326: } else {
327: pos = buf->msg_base + ret + 1;
328: v = (mqtt_len_t*) pos;
329: }
330:
331: return ntohs(v->val);
332: }
333:
334: /*
335: * mqtt_readPUBREL() Read PUBREL message
336: *
337: * @buf = Message buffer
338: * return: -1 error or MessageID
339: */
340: u_short
341: mqtt_readPUBREL(mqtt_msg_t * __restrict buf)
342: {
343: int len, ret;
344: struct mqtthdr *hdr;
345: mqtt_len_t *v;
346: caddr_t pos;
347:
348: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREL, &ret, &len);
349: if (!hdr)
350: return (u_short) -1;
351: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1! misho 352: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 353: return (u_short) -1;
354: } else {
355: pos = buf->msg_base + ret + 1;
356: v = (mqtt_len_t*) pos;
357: }
358:
359: return ntohs(v->val);
360: }
361:
362: /*
363: * mqtt_readPUBCOMP() Read PUBCOMP message
364: *
365: * @buf = Message buffer
366: * return: -1 error or MessageID
367: */
368: u_short
369: mqtt_readPUBCOMP(mqtt_msg_t * __restrict buf)
370: {
371: int len, ret;
372: struct mqtthdr *hdr;
373: mqtt_len_t *v;
374: caddr_t pos;
375:
376: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBCOMP, &ret, &len);
377: if (!hdr)
378: return (u_short) -1;
379: if (len < sizeof(mqtt_len_t)) {
1.1.1.1.2.1! misho 380: mqtt_SetErr(EINVAL, "Short message length %d", len);
1.1 misho 381: return (u_short) -1;
382: } else {
383: pos = buf->msg_base + ret + 1;
384: v = (mqtt_len_t*) pos;
385: }
386:
387: return ntohs(v->val);
388: }
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