Annotation of libaitmqtt/src/sub.c, revision 1.3.12.2
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 $
1.3.12.2! misho 6: * $Id: sub.c,v 1.3.12.1 2022/09/14 21:44:21 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:
1.3.12.1 misho 15: Copyright 2004 - 2022
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_msgSUBSCRIBE() Create SUBSCRIBE message
51: *
52: * @Topics = MQTT subscription topics
53: * @msgID = MessageID
54: * @Dup = Duplicate message
55: * @QOS = QoS
1.3.12.1 misho 56: * return: NULL error or allocated SUBSCRIBE message
1.1 misho 57: */
1.3.12.1 misho 58: mqtt_msg_t *
59: mqtt_msgSUBSCRIBE(mqtt_subscr_t ** __restrict Topics, u_short msgID,
60: u_char Dup, u_char QOS)
1.1 misho 61: {
1.3.12.1 misho 62: int len, siz;
1.3 misho 63: u_int n, *l;
1.1 misho 64: struct mqtthdr *hdr;
65: mqtthdr_var_t *topic;
66: mqtt_len_t *mid;
67: mqtt_subscr_t *t;
68: u_char *qos;
1.2 misho 69: void *data;
1.3.12.1 misho 70: mqtt_msg_t *msg = NULL;
1.1 misho 71:
1.3.12.1 misho 72: if (!Topics || !*Topics)
73: return NULL;
1.1 misho 74: if (QOS > MQTT_QOS_EXACTLY) {
1.2 misho 75: mqtt_SetErr(EINVAL, "Invalid QoS parameter");
1.3.12.1 misho 76: return NULL;
1.1 misho 77: }
78: if (!msgID && QOS != MQTT_QOS_ONCE) {
1.2 misho 79: mqtt_SetErr(EINVAL, "Invalid MessageID parameter must be >0");
1.3.12.1 misho 80: return NULL;
1.1 misho 81: }
82:
1.2 misho 83: /* calculate message size */
84: len = sizeof(mqtt_len_t); /* msgid */
1.3.12.1 misho 85: for (t = *Topics; t && t->sub_topic.msg_base; t++) /* subscribes & qos */
86: len += sizeof(mqtt_len_t) + t->sub_topic.msg_len;
1.2 misho 87:
88: /* calculate header size */
89: siz = sizeof(struct mqtthdr); /* mqtt fixed header */
90: n = mqtt_encodeLen(len); /* message size */
91: siz += mqtt_sizeLen(n) - 1; /* length size */
92:
1.3.12.1 misho 93: if (!(msg = mqtt_msgAlloc(siz + len)))
94: return NULL;
1.1 misho 95: else {
1.3.12.1 misho 96: data = msg->msg_base;
1.2 misho 97: hdr = (struct mqtthdr *) data;
1.1 misho 98: }
99:
1.2 misho 100: /* fixed header */
101: hdr->mqtt_msg.type = MQTT_TYPE_SUBSCRIBE;
102: hdr->mqtt_msg.qos = QOS;
103: hdr->mqtt_msg.dup = Dup ? 1 : 0;
104: hdr->mqtt_msg.retain = 0;
1.3 misho 105: l = (u_int*) hdr->mqtt_len;
106: *l = n;
1.2 misho 107: data += siz;
108:
1.1 misho 109: /* variable header */
1.2 misho 110: mid = (mqtt_len_t*) data;
1.1 misho 111: mid->val = htons(msgID);
1.2 misho 112: data += sizeof(mqtt_len_t);
1.1 misho 113:
114: /* payload with subscriptions */
1.3.12.1 misho 115: for (t = *Topics; t && t->sub_topic.msg_base; t++) {
1.2 misho 116: topic = (mqtthdr_var_t*) data;
1.1 misho 117: topic->var_sb.val = htons(t->sub_topic.msg_len);
118: memcpy(topic->var_data, t->sub_topic.msg_base, ntohs(topic->var_sb.val));
1.2 misho 119: data += MQTTHDR_VAR_SIZEOF(topic);
120: qos = data++;
1.3.12.2! misho 121: *qos = t->sub_qos;
1.1 misho 122: }
123:
1.3.12.1 misho 124: return msg;
1.1 misho 125: }
126:
127: /*
128: * mqtt_msgSUBACK() Create SUBACK message
129: *
130: * @Topics = MQTT subscription topics
131: * @msgID = MessageID
1.3.12.1 misho 132: * return: NULL error or allocated SUBACK message
1.1 misho 133: */
1.3.12.1 misho 134: mqtt_msg_t *
135: mqtt_msgSUBACK(mqtt_subscr_t ** __restrict Topics, u_short msgID)
1.1 misho 136: {
137: int siz = 0;
138: struct mqtthdr *hdr;
139: mqtt_len_t *v;
140: mqtt_subscr_t *t;
141: u_char *qos;
1.3.12.1 misho 142: mqtt_msg_t *msg = NULL;
1.1 misho 143:
1.3.12.1 misho 144: if (!Topics || !*Topics)
145: return NULL;
1.1 misho 146:
1.3.12.1 misho 147: if (!(msg = mqtt_msgAlloc(MQTTMSG_MAX)))
148: return NULL;
1.1 misho 149: else {
1.3.12.1 misho 150: hdr = (struct mqtthdr *) msg->msg_base;
151: siz = sizeof(struct mqtthdr);
152: v = (mqtt_len_t*) (msg->msg_base + siz);
1.1 misho 153: siz += sizeof(mqtt_len_t);
154: }
155:
156: /* MessageID */
157: v->val = htons(msgID);
158:
159: /* QoS payload from subscriptions */
1.3.12.1 misho 160: for (t = *Topics; t && t->sub_topic.msg_base; t++, siz++) {
161: qos = (msg->msg_base + siz);
1.3.12.2! misho 162: *qos = t->sub_qos;
1.1 misho 163: }
164:
165: /* fixed header */
166: hdr->mqtt_msg.type = MQTT_TYPE_SUBACK;
167: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
168:
1.3.12.1 misho 169: return msg;
1.1 misho 170: }
171:
172: /*
173: * mqtt_msgUNSUBSCRIBE() Create UNSUBSCRIBE message
174: *
175: * @Topics = MQTT subscription topics
176: * @msgID = MessageID
177: * @Dup = Duplicate message
178: * @QOS = QoS
1.3.12.1 misho 179: * return: NULL error or allocated UNSUBSCRIBE message
1.1 misho 180: */
1.3.12.1 misho 181: mqtt_msg_t *
182: mqtt_msgUNSUBSCRIBE(mqtt_subscr_t ** __restrict Topics, u_short msgID,
183: u_char Dup, u_char QOS)
1.1 misho 184: {
1.2 misho 185: int len, siz = 0;
1.3 misho 186: u_int n, *l;
1.1 misho 187: struct mqtthdr *hdr;
188: mqtthdr_var_t *topic;
189: mqtt_len_t *mid;
190: mqtt_subscr_t *t;
1.2 misho 191: void *data;
1.3.12.1 misho 192: mqtt_msg_t *msg = NULL;
1.1 misho 193:
1.3.12.1 misho 194: if (!Topics || !*Topics)
195: return NULL;
1.1 misho 196: if (QOS > MQTT_QOS_EXACTLY) {
1.2 misho 197: mqtt_SetErr(EINVAL, "Invalid QoS parameter");
1.3.12.1 misho 198: return NULL;
1.1 misho 199: }
200: if (!msgID && QOS != MQTT_QOS_ONCE) {
1.2 misho 201: mqtt_SetErr(EINVAL, "Invalid MessageID parameter must be >0");
1.3.12.1 misho 202: return NULL;
1.1 misho 203: }
204:
1.2 misho 205: /* calculate message size */
206: len = sizeof(mqtt_len_t); /* msgid */
1.3.12.1 misho 207: for (t = *Topics; t && t->sub_topic.msg_base; t++) /* subscribes */
1.2 misho 208: len += sizeof(mqtt_len_t) + t->sub_topic.msg_len;
209:
210: /* calculate header size */
211: siz = sizeof(struct mqtthdr); /* mqtt fixed header */
212: n = mqtt_encodeLen(len); /* message size */
213: siz += mqtt_sizeLen(n) - 1; /* length size */
214:
1.3.12.1 misho 215: if (!(msg = mqtt_msgAlloc(siz + len)))
216: return NULL;
1.1 misho 217: else {
1.3.12.1 misho 218: data = msg->msg_base;
1.2 misho 219: hdr = (struct mqtthdr *) data;
1.1 misho 220: }
221:
1.2 misho 222: /* fixed header */
223: hdr->mqtt_msg.type = MQTT_TYPE_UNSUBSCRIBE;
224: hdr->mqtt_msg.qos = QOS;
225: hdr->mqtt_msg.dup = Dup ? 1 : 0;
226: hdr->mqtt_msg.retain = 0;
1.3 misho 227: l = (u_int*) hdr->mqtt_len;
228: *l = n;
1.2 misho 229: data += siz;
230:
1.1 misho 231: /* variable header */
1.3.12.1 misho 232: mid = (mqtt_len_t*) (msg->msg_base + siz);
1.1 misho 233: mid->val = htons(msgID);
1.2 misho 234: data += sizeof(mqtt_len_t);
1.1 misho 235:
236: /* payload with subscriptions */
1.3.12.1 misho 237: for (t = *Topics; t && t->sub_topic.msg_base; t++) {
1.2 misho 238: topic = (mqtthdr_var_t*) data;
1.1 misho 239: topic->var_sb.val = htons(t->sub_topic.msg_len);
240: memcpy(topic->var_data, t->sub_topic.msg_base, ntohs(topic->var_sb.val));
1.2 misho 241: data += MQTTHDR_VAR_SIZEOF(topic);
1.1 misho 242: }
243:
1.3.12.1 misho 244: return msg;
1.1 misho 245: }
246:
247: /*
248: * mqtt_msgUNSUBACK() Create UNSUBACK message
249: *
250: * @msgID = MessageID
1.3.12.1 misho 251: * return: NULL error or allocated UNSUBACK message
1.1 misho 252: */
1.3.12.1 misho 253: mqtt_msg_t *
254: mqtt_msgUNSUBACK(u_short msgID)
1.1 misho 255: {
256: struct mqtthdr *hdr;
257: mqtt_len_t *v;
1.3.12.1 misho 258: mqtt_msg_t *msg = NULL;
1.1 misho 259:
1.3.12.1 misho 260: if (!(msg = mqtt_msgAlloc(sizeof(struct mqtthdr) + sizeof(mqtt_len_t))))
261: return NULL;
1.1 misho 262: else {
1.3.12.1 misho 263: hdr = (struct mqtthdr *) msg->msg_base;
264: v = (mqtt_len_t*) (msg->msg_base + sizeof(struct mqtthdr));
1.1 misho 265: }
266:
267: /* fixed header */
268: hdr->mqtt_msg.type = MQTT_TYPE_UNSUBACK;
269: *hdr->mqtt_len = sizeof(mqtt_len_t);
270:
271: /* MessageID */
272: v->val = htons(msgID);
273:
1.3.12.1 misho 274: return msg;
1.1 misho 275: }
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