Annotation of mqtt/src/conn.c, revision 1.1.2.6
1.1.2.1 misho 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,
1.1.2.3 misho 24: u_char ClrSess, u_char WillQOS, u_char WillRetain)
1.1.2.1 misho 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: }
1.1.2.3 misho 47: if (WillQOS > MQTT_QOS_EXACTLY) {
1.1.2.1 misho 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);
1.1.2.2 misho 56: siz += sizeof(struct mqtthdr);
1.1.2.1 misho 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 */
1.1.2.4 misho 68: MQTTHDR_MSGINIT(hdr);
1.1.2.1 misho 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:
1.1.2.3 misho 136: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
1.1.2.1 misho 137: mqtt_msgRealloc(buf, siz);
138: return siz;
139: }
1.1.2.2 misho 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 */
1.1.2.4 misho 172: MQTTHDR_MSGINIT(hdr);
1.1.2.2 misho 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: }
1.1.2.5 misho 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: }
1.1.2.6 ! misho 242:
! 243: /* ============= decode ============ */
! 244:
! 245: /*
! 246: * mqtt_readCONNECT() Read elements from CONNECT message
! 247: *
! 248: * @buf = Message buffer
! 249: * @kasec = Keep Alive in seconds for current connection
! 250: * @psConnID = ConnectID
! 251: * @connLen = ConnectID length
! 252: * @psUser = Username if !=NULL
! 253: * @userLen = Username length
! 254: * @psPass = Password for Username, only if csUser is set
! 255: * @passLen = Password length
! 256: * @psWillTopic = Will Topic if !=NULL Will Flags set into message
! 257: * @topicLen = Will Topic length
! 258: * @psWillMessage = Will Message, may be NULL
! 259: * @msgLen = Will Message length
! 260: * return: .reserved == 1 is error or == 0 connection flags & msg ok
! 261: */
! 262: mqtthdr_connflgs_t
! 263: mqtt_readCONNECT(mqtt_msg_t * __restrict buf, u_short *kasec, char * __restrict psConnID, int connLen,
! 264: char * __restrict psUser, int userLen, char * __restrict psPass, int passLen,
! 265: char * __restrict psWillTopic, int topicLen, char * __restrict psWillMessage, int msgLen)
! 266: {
! 267: mqtthdr_connflgs_t flg = MQTT_CONNFLGS_INIT;
! 268: struct mqtthdr *hdr;
! 269: mqtthdr_var_t *var;
! 270: mqtt_v_t *ka;
! 271: mqtthdr_protover_t *proto;
! 272: int len, ret;
! 273: caddr_t pos;
! 274:
! 275: if (!buf || !buf->msg_base || !buf->msg_len || !psConnID || !connLen)
! 276: return flg;
! 277:
! 278: hdr = (struct mqtthdr*) buf->msg_base;
! 279: if (hdr->mqtt_msg.type != MQTT_TYPE_CONNECT) {
! 280: mqtt_SetErr(EINVAL, "Error:: wrong command #%d", hdr->mqtt_msg.type);
! 281: return flg;
! 282: } else
! 283: len = mqtt_decodeLen(hdr->mqtt_len, &ret);
! 284: if (len < 12) {
! 285: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 286: return flg;
! 287: } else {
! 288: pos = buf->msg_base + ret + 1;
! 289: var = (mqtthdr_var_t*) pos;
! 290: }
! 291: /* check init string & protocol */
! 292: if (var->var_sb.sb.l != 6 || strncmp(var->var_data, MQTT_CONN_STR, 6)) {
! 293: mqtt_SetErr(EINVAL, "Error:: invalid init string %.6s(%d)",
! 294: var->var_data, var->var_sb.sb.l);
! 295: return flg;
! 296: } else {
! 297: pos += var->var_sb.sb.l + sizeof(mqtt_v_t);
! 298: proto = (mqtthdr_protover_t*) pos;
! 299: }
! 300: if (*proto != MQTT_PROTO_VER) {
! 301: mqtt_SetErr(EINVAL, "Error:: invalid protocol version %d", *pos);
! 302: return flg;
! 303: } else
! 304: pos++;
! 305: flg = *(mqtthdr_connflgs_t*) pos;
! 306: pos++;
! 307: ka = (mqtt_v_t*) pos;
! 308: *kasec = ntohs(ka->val);
! 309: pos += sizeof(mqtt_v_t);
! 310:
! 311: len -= pos - (caddr_t) var;
! 312:
! 313: /* get ConnID */
! 314: var = (mqtthdr_var_t*) pos;
! 315: len -= MQTTHDR_VAR_SIZEOF(var);
! 316: if (len < 0) {
! 317: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Connection ID %d", len);
! 318: flg.reserved = 1;
! 319: return flg;
! 320: } else {
! 321: memset(psConnID, 0, connLen--);
! 322: memcpy(psConnID, var->var_data, ntohs(var->var_sb.val) > connLen ? connLen : ntohs(var->var_sb.val));
! 323: pos += MQTTHDR_VAR_SIZEOF(var);
! 324: }
! 325:
! 326: /* get Willz */
! 327: if (flg.will_flg) {
! 328: var = (mqtthdr_var_t*) pos;
! 329: len -= MQTTHDR_VAR_SIZEOF(var);
! 330: if (len < 0) {
! 331: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Will Topic %d", len);
! 332: flg.reserved = 1;
! 333: return flg;
! 334: } else {
! 335: if (psWillTopic && topicLen) {
! 336: memset(psWillTopic, 0, topicLen--);
! 337: memcpy(psWillTopic, var->var_data,
! 338: ntohs(var->var_sb.val) > topicLen ? topicLen : ntohs(var->var_sb.val));
! 339: }
! 340: pos += MQTTHDR_VAR_SIZEOF(var);
! 341: }
! 342:
! 343: var = (mqtthdr_var_t*) pos;
! 344: len -= MQTTHDR_VAR_SIZEOF(var);
! 345: if (len < 0) {
! 346: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Will Message %d", len);
! 347: flg.reserved = 1;
! 348: return flg;
! 349: } else {
! 350: if (psWillMessage && msgLen) {
! 351: memset(psWillMessage, 0, msgLen--);
! 352: memcpy(psWillMessage, var->var_data,
! 353: ntohs(var->var_sb.val) > msgLen ? msgLen : ntohs(var->var_sb.val));
! 354: }
! 355: pos += MQTTHDR_VAR_SIZEOF(var);
! 356: }
! 357: }
! 358:
! 359: /* get User/Pass */
! 360: if (flg.username) {
! 361: var = (mqtthdr_var_t*) pos;
! 362: len -= MQTTHDR_VAR_SIZEOF(var);
! 363: if (len < 0) {
! 364: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Username %d", len);
! 365: flg.reserved = 1;
! 366: return flg;
! 367: } else {
! 368: if (psUser && userLen) {
! 369: memset(psUser, 0, userLen--);
! 370: memcpy(psUser, var->var_data,
! 371: ntohs(var->var_sb.val) > userLen ? userLen : ntohs(var->var_sb.val));
! 372: }
! 373: pos += MQTTHDR_VAR_SIZEOF(var);
! 374: }
! 375: }
! 376: if (flg.password) {
! 377: var = (mqtthdr_var_t*) pos;
! 378: len -= MQTTHDR_VAR_SIZEOF(var);
! 379: if (len < 0) {
! 380: mqtt_SetErr(EINVAL, "Error:: unexpected EOM at Password %d", len);
! 381: flg.reserved = 1;
! 382: return flg;
! 383: } else {
! 384: if (psPass && passLen) {
! 385: memset(psPass, 0, passLen--);
! 386: memcpy(psPass, var->var_data,
! 387: ntohs(var->var_sb.val) > passLen ? passLen : ntohs(var->var_sb.val));
! 388: }
! 389: pos += MQTTHDR_VAR_SIZEOF(var);
! 390: }
! 391: }
! 392:
! 393: return flg;
! 394: }
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