1: #include "global.h"
2:
3:
4: /* ------------------------------------------------------------------- */
5:
6: /*
7: * mqtt_msgCONNECT() Create CONNECT message
8: *
9: * @buf = Message buffer
10: * @csConnID = ConnectID
11: * @csUser = Username if !=NULL
12: * @csPass = Password for Username, only if csUser is set
13: * @csWillTopic = Will Topic if !=NULL Will Flags set into message
14: * @csWillMessage = Will Message, may be NULL
15: * @ClrSess = Clear Session subscriptions after disconnect
16: * @WillQOS = Will QOS if csWillTopic is set
17: * @WillRetain = Will Retain Will Message if csWillTopic is set
18: * return: -1 error or >-1 message size for send
19: */
20: int
21: mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID,
22: const char *csUser, const char *csPass,
23: const char *csWillTopic, const char *csWillMessage,
24: u_char ClrSess, u_char WillQOS, u_char WillRetain)
25: {
26: int siz = 0;
27: struct mqtthdr *hdr;
28: mqtthdr_var_t *var, *cid, *topic, *wmsg, *user, *pass;
29: mqtthdr_protover_t *proto;
30: mqtthdr_connflgs_t *flags;
31: mqtt_v_t *ka;
32:
33: if (!buf || !csConnID)
34: return -1;
35: if (strlen(csConnID) > 23) {
36: mqtt_SetErr(EINVAL, "Error:: invalid argument ConnID is too long (max 23 bytes)");
37: return -1;
38: }
39: if (csUser && strlen(csUser) > 12) {
40: mqtt_SetErr(EINVAL, "Error:: invalid argument Username is too long (max 12 bytes)");
41: return -1;
42: }
43: if (csPass && strlen(csPass) > 12) {
44: mqtt_SetErr(EINVAL, "Error:: invalid argument Password is too long (max 12 bytes)");
45: return -1;
46: }
47: if (WillQOS > MQTT_QOS_EXACTLY) {
48: mqtt_SetErr(EINVAL, "Error:: invalid argument WillQOS - unknown QOS value");
49: return -1;
50: }
51:
52: if (mqtt_msgRealloc(buf, BUFSIZ) == -1)
53: return -1;
54: else {
55: hdr = (struct mqtthdr *) (buf->msg_base + siz);
56: siz += sizeof(struct mqtthdr);
57: var = (mqtthdr_var_t*) (buf->msg_base + siz);
58: siz += 8;
59: proto = buf->msg_base + siz;
60: siz++;
61: flags = (mqtthdr_connflgs_t*) (buf->msg_base + siz);
62: siz++;
63: ka = (mqtt_v_t*) (buf->msg_base + siz);
64: siz += sizeof(mqtt_v_t);
65: }
66:
67: /* fixed header */
68: MQTTHDR_MSGINIT(hdr);
69: hdr->mqtt_msg.type = MQTT_TYPE_CONNECT;
70: *hdr->mqtt_len = 0;
71:
72: /* variable header */
73: var->var_sb.sb.l = 6;
74: memcpy(var->var_data, MQTT_CONN_STR, 6);
75:
76: *proto = MQTT_PROTO_VER;
77:
78: /* CONNECT header */
79: flags->clean_sess = ClrSess ? 1 : 0;
80: if (csUser) {
81: flags->username = 1;
82: flags->password = csPass ? 1 : 0;
83: } else {
84: flags->username = 0;
85: flags->password = 0;
86: }
87: if (csWillTopic) {
88: flags->will_flg = 1;
89: flags->will_qos = WillQOS;
90: flags->will_retain = WillRetain ? 1 : 0;
91: } else {
92: flags->will_flg = 0;
93: flags->will_qos = 0;
94: flags->will_retain = 0;
95: }
96:
97: ka->sb.l = MQTT_KEEPALIVE;
98:
99: /* ConnID */
100: cid = (mqtthdr_var_t*) (buf->msg_base + siz);
101: cid->var_sb.val = htons(strlen(csConnID));
102: siz += MQTTHDR_VAR_SIZEOF(cid);
103: memcpy(cid->var_data, csConnID, ntohs(cid->var_sb.val));
104:
105: /* If Will Flags setup */
106: if (csWillTopic) {
107: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
108: topic->var_sb.val = htons(strlen(csWillTopic));
109: memcpy(topic->var_data, csWillTopic, ntohs(topic->var_sb.val));
110: siz += MQTTHDR_VAR_SIZEOF(topic);
111:
112: wmsg = (mqtthdr_var_t*) (buf->msg_base + siz);
113: if (csWillMessage) {
114: wmsg->var_sb.val = htons(strlen(csWillMessage));
115: memcpy(wmsg->var_data, csWillMessage, ntohs(wmsg->var_sb.val));
116: } else
117: wmsg->var_sb.val = 0;
118: siz += MQTTHDR_VAR_SIZEOF(wmsg);
119: }
120:
121: /* If defined Username & Password */
122: if (csUser) {
123: user = (mqtthdr_var_t*) (buf->msg_base + siz);
124: user->var_sb.val = htons(strlen(csUser));
125: memcpy(user->var_data, csUser, ntohs(user->var_sb.val));
126: siz += MQTTHDR_VAR_SIZEOF(user);
127:
128: if (csPass) {
129: pass = (mqtthdr_var_t*) (buf->msg_base + siz);
130: pass->var_sb.val = htons(strlen(csPass));
131: memcpy(pass->var_data, csPass, ntohs(pass->var_sb.val));
132: siz += MQTTHDR_VAR_SIZEOF(pass);
133: }
134: }
135:
136: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
137: mqtt_msgRealloc(buf, siz);
138: return siz;
139: }
140:
141: /*
142: * mqtt_msgCONNACK() Create CONNACK message
143: *
144: * @buf = Message buffer
145: * @retcode = Return code
146: * return: -1 error or >-1 message size for send
147: */
148: int
149: mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, u_char retcode)
150: {
151: int siz = 0;
152: struct mqtthdr *hdr;
153: mqtthdr_connack_t *ack;
154:
155: if (!buf)
156: return -1;
157: if (retcode > MQTT_RETCODE_DENIED) {
158: mqtt_SetErr(EINVAL, "Error:: invalid retcode");
159: return -1;
160: }
161:
162: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtthdr_connack_t)) == -1)
163: return -1;
164: else {
165: hdr = (struct mqtthdr *) (buf->msg_base + siz);
166: siz += sizeof(struct mqtthdr);
167: ack = (mqtthdr_connack_t*) (buf->msg_base + siz);
168: siz += sizeof(mqtthdr_connack_t);
169: }
170:
171: /* fixed header */
172: MQTTHDR_MSGINIT(hdr);
173: hdr->mqtt_msg.type = MQTT_TYPE_CONNACK;
174: *hdr->mqtt_len = sizeof(mqtthdr_connack_t);
175:
176: /* CONNACK header */
177: ack->reserved = 0;
178: ack->retcode = retcode;
179:
180: return siz;
181: }
182:
183: static int
184: _mqtt_msgSIMPLE_(mqtt_msg_t * __restrict buf, u_char cmd)
185: {
186: int siz = 0;
187: struct mqtthdr *hdr;
188:
189: if (!buf)
190: return -1;
191:
192: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr)) == -1)
193: return -1;
194: else {
195: hdr = (struct mqtthdr *) (buf->msg_base + siz);
196: siz += sizeof(struct mqtthdr);
197: }
198:
199: /* fixed header */
200: MQTTHDR_MSGINIT(hdr);
201: hdr->mqtt_msg.type = cmd;
202: *hdr->mqtt_len = 0;
203:
204: return siz;
205: }
206:
207: /*
208: * mqtt_msgPINGREQ() Create PINGREQ message
209: *
210: * @buf = Message buffer
211: * return: -1 error or >-1 message size for send
212: */
213: int
214: mqtt_msgPINGREQ(mqtt_msg_t * __restrict buf)
215: {
216: return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_PINGREQ);
217: }
218:
219: /*
220: * mqtt_msgPINGRESP() Create PINGRESP message
221: *
222: * @buf = Message buffer
223: * return: -1 error or >-1 message size for send
224: */
225: int
226: mqtt_msgPINGRESP(mqtt_msg_t * __restrict buf)
227: {
228: return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_PINGRESP);
229: }
230:
231: /*
232: * mqtt_msgDISCONNECT() Create DISCONNECT message
233: *
234: * @buf = Message buffer
235: * return: -1 error or >-1 message size for send
236: */
237: int
238: mqtt_msgDISCONNECT(mqtt_msg_t * __restrict buf)
239: {
240: return _mqtt_msgSIMPLE_(buf, MQTT_TYPE_DISCONNECT);
241: }
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