1: /*************************************************************************
2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
6: * $Id: aitmqtt.h,v 1.1.1.1.2.11 2012/04/27 08:12:30 misho Exp $
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: */
46: #ifndef __AITMQTT_H
47: #define __AITMQTT_H
48:
49:
50: #define MAX_CONNID 24
51: #define MAX_CRED 13
52: #define MQTTMSG_MAX 65529
53: #define MQTT_DATA_MAX 268435455
54:
55: #define MQTT_PROTO_VER 3
56: #define MQTT_KEEPALIVE 10
57: #define MQTT_DEFAULT_MSGID 0xDEBA
58:
59: /* FIXED HEADER */
60:
61: struct mqtthdr {
62: union {
63: struct {
64: unsigned char retain:1,
65: qos:2,
66: dup:1,
67: type:4;
68: };
69: unsigned char val;
70: } mqtt_msg;
71: unsigned char mqtt_len[1]; /* may be grow to 4 bytes */
72: } __packed;
73: #define MQTTHDR_MSGINIT(x) (assert((x)), (x)->mqtt_msg.val ^= (x)->mqtt_msg.val)
74:
75: #define MQTT_TYPE_UNKNOWN 0 /* reserved */
76: #define MQTT_TYPE_CONNECT 1 /* client request to connect to server */
77: #define MQTT_TYPE_CONNACK 2 /* connect acknowledgment */
78: #define MQTT_TYPE_PUBLISH 3 /* publish message */
79: #define MQTT_TYPE_PUBACK 4 /* publish acknowledgment */
80: #define MQTT_TYPE_PUBREC 5 /* publish received (assured delivery part 1) */
81: #define MQTT_TYPE_PUBREL 6 /* publish release (assured delivery part 2) */
82: #define MQTT_TYPE_PUBCOMP 7 /* publish complete (assured delivery part 3) */
83: #define MQTT_TYPE_SUBSCRIBE 8 /* client subscribe request */
84: #define MQTT_TYPE_SUBACK 9 /* subscribe acknowledgment */
85: #define MQTT_TYPE_UNSUBSCRIBE 10 /* client unsubscribe request */
86: #define MQTT_TYPE_UNSUBACK 11 /* unsubscribe acknowledgment */
87: #define MQTT_TYPE_PINGREQ 12 /* PING request */
88: #define MQTT_TYPE_PINGRESP 13 /* PING response */
89: #define MQTT_TYPE_DISCONNECT 14 /* client is disconnecting */
90: #define MQTT_TYPE_MAX 15 /* reserved */
91:
92: #define MQTT_FLAG_DUP 1 /* This flag is set when the client or server attempts to re-deliver
93: a PUBLISH, PUBREL, SUBSCRIBE or UNSUBSCRIBE message.
94: This applies to messages where the value of QoS is greater than
95: zero (0), and an acknowledgment is required.
96: When the DUP bit is set, the variable header includes a Message ID.
97:
98: The recipient should treat this flag as a hint as to whether
99: the message may have been previously received.
100: It should not be relied on to detect duplicates. */
101:
102: #define MQTT_QOS_ONCE 0 /* At most once, Fire and Forget, <=1 */
103: #define MQTT_QOS_ACK 1 /* At least once, Acknowledged delivery, >=1 */
104: #define MQTT_QOS_EXACTLY 2 /* Exactly once, Assured delivery, =1 */
105: #define MQTT_QOS_RESERVED 3 /* reserved */
106:
107: #define MQTT_QOS_DENY 0 /* Not granted QoS for SUBACK */
108: #define MQTT_QOS_PASS 2 /* Granted QoS for SUBACK */
109:
110: #define MQTT_FLAG_RETAIN 1 /* This flag is only used on PUBLISH messages.
111:
112: When a client sends a PUBLISH to a server,
113: if the Retain flag is set (1),
114: the server should hold on to the message after it has been
115: delivered to the current subscribers.
116: When a new subscription is established on a topic,
117: the last retained message on that topic should be sent to
118: the subscriber with the Retain flag set.
119: If there is no retained message, nothing is sent
120: This is useful where publishers send messages on a
121: "report by exception" basis, where it might be some time between messages.
122: This allows new subscribers to instantly receive data with the retained,
123: or Last Known Good, value.
124:
125: When a server sends a PUBLISH to a client as a result of
126: a subscription that already existed when the original PUBLISH arrived,
127: the Retain flag should not be set, regardless of the Retain flag
128: of the original PUBLISH. This allows a client to distinguish messages
129: that are being received because they were retained and those
130: that are being received "live".
131:
132: Retained messages should be kept over restarts of the server.
133: A server may delete a retained message if it receives a message
134: with a zero-length payload and the Retain flag set on the same topic. */
135:
136: /* VARIABLE HEADERS */
137:
138: #define MQTT_RETCODE_ACCEPTED 0
139: #define MQTT_RETCODE_REFUSE_VER 1
140: #define MQTT_RETCODE_REFUSE_ID 2
141: #define MQTT_RETCODE_REFUSE_UNAVAIL 3
142: #define MQTT_RETCODE_REFUSE_USERPASS 4
143: #define MQTT_RETCODE_DENIED 5
144:
145:
146: /* MQTT Message buffer */
147:
148: typedef struct {
149: void *msg_base;
150: unsigned short msg_len;
151: } mqtt_msg_t;
152:
153: /* MQTT structures */
154:
155: typedef union {
156: struct {
157: unsigned short m:8,
158: l:8;
159: } sb;
160: unsigned short val;
161: } mqtt_len_t;
162:
163: typedef struct {
164: unsigned char sub_ret;
165: mqtt_msg_t sub_topic;
166: mqtt_msg_t sub_value;
167: } mqtt_subscr_t;
168:
169: typedef struct {
170: mqtt_len_t var_sb;
171: unsigned char var_data[0];
172: } __packed mqtthdr_var_t;
173: #define MQTTHDR_VAR_SIZEOF(x) (assert((x)), sizeof(mqtt_len_t) + ntohs((x)->var_sb.val))
174:
175: typedef unsigned char mqtthdr_protover_t;
176:
177: typedef union {
178: struct {
179: unsigned char reserved:1,
180: clean_sess:1,
181: will_flg:1,
182: will_qos:2,
183: will_retain:1,
184: password:1,
185: username:1;
186: };
187: unsigned char flags;
188: } __packed mqtthdr_connflgs_t;
189:
190: typedef struct {
191: unsigned char reserved;
192: unsigned char retcode;
193: } __packed mqtthdr_connack_t;
194:
195:
196: // -------------------------------------------------------
197: // mqtt_GetErrno() Get error code of last operation
198: inline int mqtt_GetErrno();
199: // mqtt_GetError() Get error text of last operation
200: inline const char *mqtt_GetError();
201: // -------------------------------------------------------
202:
203:
204: /*
205: * mqtt_msgAlloc() Allocate memory for MQTT Message
206: *
207: * @len = >0 Allocate buffer with length
208: * return: NULL error or Message, after use must call mqtt_msgFree() with all!=0
209: */
210: inline mqtt_msg_t *mqtt_msgAlloc(unsigned short len);
211: /*
212: * mqtt_msgFree() Free MQTT message
213: *
214: * @msg = Message buffer
215: * @all = !=0 Destroy entire message, if MQTT Message allocated with mqtt_msgAlloc()
216: * return: none
217: */
218: inline void mqtt_msgFree(mqtt_msg_t ** __restrict msg, int all);
219: /*
220: * mqtt_msgRealloc() Reallocate MQTT message buffer
221: *
222: * @msg = MQTT message
223: * @len = new length
224: * return: -1 error or >-1 old buffer length
225: */
226: inline int mqtt_msgRealloc(mqtt_msg_t * __restrict msg, unsigned short len);
227:
228: /*
229: * mqtt_expandTopic() - Expanding topic to regular expression
230: *
231: * @csInput = Input topic
232: * @psRegEx = Output to regular expression
233: * @regexLen = Length of psRegEx
234: * @BOL = Begin of Line, if =0 not added
235: * @EOL = End of Line, if =0 not appended
236: * return: -1 error, 0 nothing expanded or >0 expanded bytes
237: */
238: int mqtt_expandTopic(const char *csInput, char * __restrict psRegEx, int regexLen,
239: unsigned char BOL, unsigned char EOL);
240: /*
241: * mqtt_sqlTopic() - Expanding topic to SQL search string
242: *
243: * @csInput = Input topic
244: * @psSQL = Output to SQL search string
245: * @sqlLen = Length of psSQL
246: * return: -1 error, 0 changed bytes
247: */
248: int mqtt_sqlTopic(const char *csInput, char * __restrict psSQL, int sqlLen);
249:
250: /*
251: * mqtt_encodeLen() Encode number to MQTT length field
252: *
253: * @num = number for encode
254: * return: -1 error or >-1 length
255: */
256: inline unsigned int mqtt_encodeLen(unsigned int num);
257: /*
258: * mqtt_decodeLen() Decode length from MQTT packet
259: *
260: * @len = length from MQTT header
261: * @n = sizeof bytes, if !=NULL
262: * return: -1 error, >-1 length of message
263: */
264: inline unsigned int mqtt_decodeLen(void * __restrict len, int * __restrict n);
265: /*
266: * mqtt_sizeLen Return sizeof len field
267: *
268: * @len = length
269: * return: -1 error, >-1 sizeof len in bytes
270: */
271: inline char mqtt_sizeLen(unsigned int len);
272: /*
273: * mqtt_str2subs Create MQTT subscribe variable from string(s)
274: *
275: * @csStr = null terminated string array
276: * @strnum = copy at most number of strings elements
277: * @qoses = QoS elements applied to subscribe variable,
278: * count of elements must be equal with csStr elements
279: * return: NULL error or != subscribe variables array, must be free after use with mqtt_freeSub()
280: */
281: inline mqtt_subscr_t *mqtt_str2subs(const char **csStr, unsigned short strnum,
282: unsigned char *qoses);
283: /*
284: * mqtt_subFree() Free array from subscribe variables
285: *
286: * @subs = Subscribe variables
287: * return: none
288: */
289: inline void mqtt_subFree(mqtt_subscr_t ** __restrict subs);
290: /*
291: * mqtt_subAlloc() Create array from subscribe variables
292: *
293: * @num = Number of elements
294: * return: NULL error or subscribe array, after use must call mqtt_subFree()
295: */
296: inline mqtt_subscr_t *mqtt_subAlloc(unsigned short num);
297: /*
298: * mqtt_subRealloc() Reallocate array from subscribe variables
299: *
300: * @subs = Subscribe array
301: * @num = Number of elements
302: * return: NULL error or subscribe array, after use must call mqtt_subFree()
303: */
304: inline mqtt_subscr_t *mqtt_subRealloc(mqtt_subscr_t ** __restrict subs, unsigned short num);
305:
306:
307: /*** SENDER FUNCTIONS ***/
308:
309: /*
310: * mqtt_msgCONNECT() Create CONNECT message
311: *
312: * @buf = Message buffer
313: * @csConnID = ConnectID
314: * @kasec = Keep alive timeout
315: * @csUser = Username if !=NULL
316: * @csPass = Password for Username, only if csUser is set
317: * @csWillTopic = Will Topic if !=NULL Will Flags set into message
318: * @csWillMessage = Will Message, may be NULL
319: * @ClrSess = Clear Session subscriptions after disconnect
320: * @WillQOS = Will QOS if csWillTopic is set
321: * @WillRetain = Will Retain Will Message if csWillTopic is set
322: * return: -1 error or >-1 message size for send
323: */
324: int mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID,
325: unsigned short kasec, const char *csUser, const char *csPass,
326: const char *csWillTopic, const char *csWillMessage,
327: unsigned char ClrSess, unsigned char WillQOS, unsigned char WillRetain);
328: /*
329: * mqtt_msgCONNACK() Create CONNACK message
330: *
331: * @buf = Message buffer
332: * @retcode = Return code
333: * return: -1 error or >-1 message size for send
334: */
335: int mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, unsigned char retcode);
336: /*
337: * mqtt_msgDISCONNECT() Create DISCONNECT message
338: *
339: * @buf = Message buffer
340: * return: -1 error or >-1 message size for send
341: */
342: int mqtt_msgDISCONNECT(mqtt_msg_t * __restrict buf);
343: /*
344: * mqtt_msgPINGREQ() Create PINGREQ message
345: *
346: * @buf = Message buffer
347: * return: -1 error or >-1 message size for send
348: */
349: int mqtt_msgPINGREQ(mqtt_msg_t * __restrict buf);
350: /*
351: * mqtt_msgPINGRESP() Create PINGRESP message
352: *
353: * @buf = Message buffer
354: * return: -1 error or >-1 message size for send
355: */
356: int mqtt_msgPINGRESP(mqtt_msg_t * __restrict buf);
357:
358: /*
359: * mqtt_msgPUBLISH() Create PUBLISH message
360: *
361: * @buf = Message buffer
362: * @csTopic = Publish topic
363: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
364: * @Dup = Duplicate message
365: * @QOS = QoS
366: * @Retain = Retain message
367: * @pData = Publish data into topic
368: * @datlen = Publish data length
369: * return: -1 error or >-1 message size for send
370: */
371: int mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic,
372: unsigned short msgID, unsigned char Dup, unsigned char QOS,
373: unsigned char Retain, const void *pData, int datlen);
374: /*
375: * mqtt_msgPUBACK() Create PUBACK message
376: *
377: * @buf = Message buffer
378: * @msgID = MessageID
379: * return: -1 error or >-1 message size for send
380: */
381: inline int mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, unsigned short msgID);
382: /*
383: * mqtt_msgPUBREC() Create PUBREC message
384: *
385: * @buf = Message buffer
386: * @msgID = MessageID
387: * return: -1 error or >-1 message size for send
388: */
389: inline int mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, unsigned short msgID);
390: /*
391: * mqtt_msgPUBREL() Create PUBREL message
392: *
393: * @buf = Message buffer
394: * @msgID = MessageID
395: * return: -1 error or >-1 message size for send
396: */
397: inline int mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, unsigned short msgID);
398: /*
399: * mqtt_msgPUBCOMP() Create PUBCOMP message
400: *
401: * @buf = Message buffer
402: * @msgID = MessageID
403: * return: -1 error or >-1 message size for send
404: */
405: inline int mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, unsigned short msgID);
406:
407: /*
408: * mqtt_msgSUBSCRIBE() Create SUBSCRIBE message
409: *
410: * @buf = Message buffer
411: * @Topics = MQTT subscription topics
412: * @msgID = MessageID
413: * @Dup = Duplicate message
414: * @QOS = QoS
415: * return: -1 error or >-1 message size for send
416: */
417: int
418: mqtt_msgSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
419: unsigned short msgID, unsigned char Dup, unsigned char QOS);
420: /*
421: * mqtt_msgSUBACK() Create SUBACK message
422: *
423: * @buf = Message buffer
424: * @Topics = MQTT subscription topics
425: * @msgID = MessageID
426: * return: -1 error or >-1 message size for send
427: */
428: int mqtt_msgSUBACK(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
429: unsigned short msgID);
430: /*
431: * mqtt_msgUNSUBSCRIBE() Create UNSUBSCRIBE message
432: *
433: * @buf = Message buffer
434: * @Topics = MQTT subscription topics
435: * @msgID = MessageID
436: * @Dup = Duplicate message
437: * @QOS = QoS
438: * return: -1 error or >-1 message size for send
439: */
440: int
441: mqtt_msgUNSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
442: unsigned short msgID, unsigned char Dup, unsigned char QOS);
443: /*
444: * mqtt_msgUNSUBACK() Create UNSUBACK message
445: *
446: * @buf = Message buffer
447: * @msgID = MessageID
448: * return: -1 error or >-1 message size for send
449: */
450: int mqtt_msgUNSUBACK(mqtt_msg_t * __restrict buf, unsigned short msgID);
451:
452:
453: /*** RECEIVER FUNCTIONS ***/
454:
455: /*
456: * mqtt_readCONNECT() Read elements from CONNECT message
457: *
458: * @buf = Message buffer
459: * @kasec = Keep Alive in seconds for current connection
460: * @psConnID = ConnectID
461: * @connLen = ConnectID length
462: * @psUser = Username if !=NULL
463: * @userLen = Username length
464: * @psPass = Password for Username, only if csUser is set
465: * @passLen = Password length
466: * @psWillTopic = Will Topic if !=NULL Will Flags set into message and must be free()
467: * @psWillMessage = Will Message, may be NULL if !NULL must be free() after use!
468: * return: .reserved == 1 is error or == 0 connection flags & msg ok
469: */
470: mqtthdr_connack_t mqtt_readCONNECT(mqtt_msg_t * __restrict buf, unsigned short *kasec,
471: char * __restrict psConnID, int connLen,
472: char * __restrict psUser, int userLen, char * __restrict psPass, int passLen,
473: char ** __restrict psWillTopic, char ** __restrict psWillMessage);
474: /*
475: * mqtt_readCONNACK() Read CONNACK message
476: *
477: * @buf = Message buffer
478: * return: -1 error or >-1 CONNECT message return code
479: */
480: unsigned char mqtt_readCONNACK(mqtt_msg_t * __restrict buf);
481: /*
482: * mqtt_readDISCONNECT() Read DISCONNECT message
483: *
484: * @buf = Message buffer
485: * return: -1 error, 0 ok, >0 undefined result
486: */
487: int mqtt_readDISCONNECT(mqtt_msg_t * __restrict buf);
488: /*
489: * mqtt_readPINGREQ() Read PINGREQ message
490: *
491: * @buf = Message buffer
492: * return: -1 error, 0 ok, >0 undefined result
493: */
494: int mqtt_readPINGREQ(mqtt_msg_t * __restrict buf);
495: /*
496: * mqtt_readPINGRESP() Read PINGRESP message
497: *
498: * @buf = Message buffer
499: * return: -1 error, 0 ok, >0 undefined result
500: */
501: int mqtt_readPINGRESP(mqtt_msg_t * __restrict buf);
502:
503: /*
504: * mqtt_readPUBLISH() Read PUBLISH message
505: *
506: * @buf = Message buffer
507: * @psTopic = Topic
508: * @topicLen = Topic length
509: * @msgID = MessageID
510: * @pData = Data buffer
511: * @datLen = Data buffer length, if *datLen == 0 allocate memory for pData
512: * return: NULL error or !=NULL MQTT fixed header
513: */
514: struct mqtthdr *mqtt_readPUBLISH(mqtt_msg_t * __restrict buf, char * __restrict psTopic,
515: int topicLen, unsigned short *msgID, void * __restrict pData, int *datLen);
516: /*
517: * mqtt_readPUBACK() Read PUBACK message
518: *
519: * @buf = Message buffer
520: * return: -1 error or MessageID
521: */
522: unsigned short mqtt_readPUBACK(mqtt_msg_t * __restrict buf);
523: /*
524: * mqtt_readPUBREC() Read PUBREC message
525: *
526: * @buf = Message buffer
527: * return: -1 error or MessageID
528: */
529: unsigned short mqtt_readPUBREC(mqtt_msg_t * __restrict buf);
530: /*
531: * mqtt_readPUBREL() Read PUBREL message
532: *
533: * @buf = Message buffer
534: * return: -1 error or MessageID
535: */
536: unsigned short mqtt_readPUBREL(mqtt_msg_t * __restrict buf);
537: /*
538: * mqtt_readPUBCOMP() Read PUBCOMP message
539: *
540: * @buf = Message buffer
541: * return: -1 error or MessageID
542: */
543: unsigned short mqtt_readPUBCOMP(mqtt_msg_t * __restrict buf);
544:
545: /*
546: * mqtt_readSUBSCRIBE() Read SUBSCRIBE message
547: *
548: * @buf = Message buffer
549: * @msgID = MessageID
550: * @subscr = Subscriptions, must be free after use with mqtt_subFree()
551: * return: -1 error or >-1 elements into subscr
552: */
553: int mqtt_readSUBSCRIBE(mqtt_msg_t * __restrict buf, unsigned short *msgID,
554: mqtt_subscr_t **subscr);
555: /*
556: * mqtt_readSUBACK() Read SUBACK message
557: *
558: * @buf = Message buffer
559: * @msgID = MessageID
560: * @subqos = Subscribes QoS, must be free after use with free()
561: * return: -1 error or >-1 readed subscribes QoS elements
562: */
563: int mqtt_readSUBACK(mqtt_msg_t * __restrict buf, unsigned short *msgID, unsigned char **subqos);
564: /*
565: * mqtt_readUNSUBSCRIBE() Read UNSUBSCRIBE message
566: *
567: * @buf = Message buffer
568: * @msgID = MessageID
569: * @subscr = Subscriptions, must be free after use with mqtt_subFree()
570: * return: -1 error or >-1 elements into subscr
571: */
572: int mqtt_readUNSUBSCRIBE(mqtt_msg_t * __restrict buf, unsigned short *msgID,
573: mqtt_subscr_t **subscr);
574: /*
575: * mqtt_readUNSUBACK() Read UNSUBACK message
576: *
577: * @buf = Message buffer
578: * return: -1 error or MessageID
579: */
580: unsigned short mqtt_readUNSUBACK(mqtt_msg_t * __restrict buf);
581:
582:
583: #endif
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