Annotation of libaitmqtt/src/pub.c, revision 1.1
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 $
! 6: * $Id: aitsched.c,v 1.5 2012/01/24 21:59:47 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
! 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:
! 51: /*
! 52: * mqtt_msgPUBLISH() Create PUBLISH message
! 53: *
! 54: * @buf = Message buffer
! 55: * @csTopic = Publish topic
! 56: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
! 57: * @Dup = Duplicate message
! 58: * @QOS = QoS
! 59: * @Retain = Retain message
! 60: * @pData = Publish data into topic
! 61: * @datlen = Publish data length
! 62: * return: -1 error or >-1 message size for send
! 63: */
! 64: int
! 65: mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic, u_short msgID,
! 66: u_char Dup, u_char QOS, u_char Retain, const void *pData, int datlen)
! 67: {
! 68: int siz = 0;
! 69: struct mqtthdr *hdr;
! 70: mqtthdr_var_t *topic;
! 71: mqtt_len_t *mid;
! 72: void *data;
! 73:
! 74: if (!buf || !csTopic)
! 75: return -1;
! 76: if (QOS > MQTT_QOS_EXACTLY) {
! 77: mqtt_SetErr(EINVAL, "Error:: invalid QoS parameter");
! 78: return -1;
! 79: }
! 80: if (!msgID && QOS != MQTT_QOS_ONCE) {
! 81: mqtt_SetErr(EINVAL, "Error:: invalid MessageID parameter must be >0");
! 82: return -1;
! 83: }
! 84:
! 85: if (mqtt_msgRealloc(buf, MQTTMSG_MAX) == -1)
! 86: return -1;
! 87: else {
! 88: hdr = (struct mqtthdr *) (buf->msg_base + siz);
! 89: siz += sizeof(struct mqtthdr);
! 90: }
! 91:
! 92: /* variable header */
! 93: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
! 94: topic->var_sb.val = htons(strlen(csTopic));
! 95: memcpy(topic->var_data, csTopic, ntohs(topic->var_sb.val));
! 96: siz += MQTTHDR_VAR_SIZEOF(topic);
! 97:
! 98: mid = (mqtt_len_t*) (buf->msg_base + siz);
! 99: mid->val = htons(msgID);
! 100: siz += sizeof(mqtt_len_t);
! 101:
! 102: /* load with data */
! 103: if (pData && datlen) {
! 104: data = buf->msg_base + siz;
! 105: memcpy(data, pData, datlen);
! 106: siz += datlen;
! 107: }
! 108:
! 109: /* fixed header */
! 110: MQTTHDR_MSGINIT(hdr);
! 111: hdr->mqtt_msg.type = MQTT_TYPE_PUBLISH;
! 112: hdr->mqtt_msg.qos = QOS;
! 113: hdr->mqtt_msg.dup = Dup ? 1 : 0;
! 114: hdr->mqtt_msg.retain = Retain ? 1 : 0;
! 115: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
! 116:
! 117: mqtt_msgRealloc(buf, siz);
! 118: return siz;
! 119: }
! 120:
! 121: static int
! 122: _mqtt_msgPUB_(mqtt_msg_t * __restrict buf, u_char cmd, u_short msgID)
! 123: {
! 124: int siz = 0;
! 125: struct mqtthdr *hdr;
! 126: mqtt_len_t *v;
! 127:
! 128: if (!buf)
! 129: return -1;
! 130:
! 131: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtt_len_t)) == -1)
! 132: return -1;
! 133: else {
! 134: hdr = (struct mqtthdr *) (buf->msg_base + siz);
! 135: siz += sizeof(struct mqtthdr);
! 136: v = (mqtt_len_t*) (buf->msg_base + siz);
! 137: siz += sizeof(mqtt_len_t);
! 138: }
! 139:
! 140: /* fixed header */
! 141: MQTTHDR_MSGINIT(hdr);
! 142: hdr->mqtt_msg.type = cmd;
! 143: *hdr->mqtt_len = sizeof(mqtt_len_t);
! 144:
! 145: /* MessageID */
! 146: v->val = htons(msgID);
! 147:
! 148: return siz;
! 149: }
! 150:
! 151: /*
! 152: * mqtt_msgPUBACK() Create PUBACK message
! 153: *
! 154: * @buf = Message buffer
! 155: * @msgID = MessageID
! 156: * return: -1 error or >-1 message size for send
! 157: */
! 158: inline int
! 159: mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, u_short msgID)
! 160: {
! 161: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBACK, msgID);
! 162: }
! 163:
! 164: /*
! 165: * mqtt_msgPUBREC() Create PUBREC message
! 166: *
! 167: * @buf = Message buffer
! 168: * @msgID = MessageID
! 169: * return: -1 error or >-1 message size for send
! 170: */
! 171: inline int
! 172: mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, u_short msgID)
! 173: {
! 174: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREC, msgID);
! 175: }
! 176:
! 177: /*
! 178: * mqtt_msgPUBREL() Create PUBREL message
! 179: *
! 180: * @buf = Message buffer
! 181: * @msgID = MessageID
! 182: * return: -1 error or >-1 message size for send
! 183: */
! 184: inline int
! 185: mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, u_short msgID)
! 186: {
! 187: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBREL, msgID);
! 188: }
! 189:
! 190: /*
! 191: * mqtt_msgPUBCOMP() Create PUBCOMP message
! 192: *
! 193: * @buf = Message buffer
! 194: * @msgID = MessageID
! 195: * return: -1 error or >-1 message size for send
! 196: */
! 197: inline int
! 198: mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, u_short msgID)
! 199: {
! 200: return _mqtt_msgPUB_(buf, MQTT_TYPE_PUBCOMP, msgID);
! 201: }
! 202:
! 203:
! 204: /* ============= decode ============ */
! 205:
! 206: /*
! 207: * mqtt_readPUBLISH() Read PUBLISH message
! 208: *
! 209: * @buf = Message buffer
! 210: * @psTopic = Topic
! 211: * @topicLen = Topic length
! 212: * @msgID = MessageID
! 213: * @pData = Data buffer
! 214: * @datLen = Data buffer length, if *datLen == 0 allocate memory for pData
! 215: * return: NULL error or !=NULL MQTT fixed header
! 216: */
! 217: struct mqtthdr *
! 218: mqtt_readPUBLISH(mqtt_msg_t * __restrict buf, char * __restrict psTopic, int topicLen,
! 219: u_short *msgID, void * __restrict pData, int *datLen)
! 220: {
! 221: int len, ret;
! 222: struct mqtthdr *hdr;
! 223: mqtthdr_var_t *var;
! 224: mqtt_len_t *v;
! 225: caddr_t pos;
! 226:
! 227: if (!buf || !psTopic || !msgID || !pData)
! 228: return NULL;
! 229:
! 230: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBLISH, &ret, &len);
! 231: if (!hdr)
! 232: return NULL;
! 233: pos = buf->msg_base + ret + 1;
! 234: var = (mqtthdr_var_t*) pos;
! 235:
! 236: /* topic */
! 237: len -= MQTTHDR_VAR_SIZEOF(var);
! 238: if (len < 0) {
! 239: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 240: return NULL;
! 241: } else {
! 242: memset(psTopic, 0, topicLen--);
! 243: memcpy(psTopic, var->var_data, ntohs(var->var_sb.val) > topicLen ?
! 244: topicLen : ntohs(var->var_sb.val));
! 245: pos += MQTTHDR_VAR_SIZEOF(var);
! 246: v = (mqtt_len_t*) pos;
! 247: }
! 248:
! 249: len -= sizeof(mqtt_len_t);
! 250: if (len < 0) {
! 251: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 252: return NULL;
! 253: } else {
! 254: *msgID = ntohs(v->val);
! 255: pos += sizeof(mqtt_len_t);
! 256: }
! 257:
! 258: /* data */
! 259: if (len < 0) {
! 260: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 261: return NULL;
! 262: } else {
! 263: if (!*datLen) {
! 264: if (!(pData = malloc(len))) {
! 265: LOGERR;
! 266: return NULL;
! 267: } else
! 268: *datLen = len;
! 269: }
! 270:
! 271: memset(pData, 0, *datLen);
! 272: if (len < *datLen)
! 273: *datLen = len;
! 274: memcpy(pData, pos, *datLen);
! 275: }
! 276:
! 277: return hdr;
! 278: }
! 279:
! 280: /*
! 281: * mqtt_readPUBACK() Read PUBACK message
! 282: *
! 283: * @buf = Message buffer
! 284: * return: -1 error or MessageID
! 285: */
! 286: u_short
! 287: mqtt_readPUBACK(mqtt_msg_t * __restrict buf)
! 288: {
! 289: int len, ret;
! 290: struct mqtthdr *hdr;
! 291: mqtt_len_t *v;
! 292: caddr_t pos;
! 293:
! 294: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBACK, &ret, &len);
! 295: if (!hdr)
! 296: return (u_short) -1;
! 297: if (len < sizeof(mqtt_len_t)) {
! 298: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 299: return (u_short) -1;
! 300: } else {
! 301: pos = buf->msg_base + ret + 1;
! 302: v = (mqtt_len_t*) pos;
! 303: }
! 304:
! 305: return ntohs(v->val);
! 306: }
! 307:
! 308: /*
! 309: * mqtt_readPUBREC() Read PUBREC message
! 310: *
! 311: * @buf = Message buffer
! 312: * return: -1 error or MessageID
! 313: */
! 314: u_short
! 315: mqtt_readPUBREC(mqtt_msg_t * __restrict buf)
! 316: {
! 317: int len, ret;
! 318: struct mqtthdr *hdr;
! 319: mqtt_len_t *v;
! 320: caddr_t pos;
! 321:
! 322: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREC, &ret, &len);
! 323: if (!hdr)
! 324: return (u_short) -1;
! 325: if (len < sizeof(mqtt_len_t)) {
! 326: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 327: return (u_short) -1;
! 328: } else {
! 329: pos = buf->msg_base + ret + 1;
! 330: v = (mqtt_len_t*) pos;
! 331: }
! 332:
! 333: return ntohs(v->val);
! 334: }
! 335:
! 336: /*
! 337: * mqtt_readPUBREL() Read PUBREL message
! 338: *
! 339: * @buf = Message buffer
! 340: * return: -1 error or MessageID
! 341: */
! 342: u_short
! 343: mqtt_readPUBREL(mqtt_msg_t * __restrict buf)
! 344: {
! 345: int len, ret;
! 346: struct mqtthdr *hdr;
! 347: mqtt_len_t *v;
! 348: caddr_t pos;
! 349:
! 350: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBREL, &ret, &len);
! 351: if (!hdr)
! 352: return (u_short) -1;
! 353: if (len < sizeof(mqtt_len_t)) {
! 354: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 355: return (u_short) -1;
! 356: } else {
! 357: pos = buf->msg_base + ret + 1;
! 358: v = (mqtt_len_t*) pos;
! 359: }
! 360:
! 361: return ntohs(v->val);
! 362: }
! 363:
! 364: /*
! 365: * mqtt_readPUBCOMP() Read PUBCOMP message
! 366: *
! 367: * @buf = Message buffer
! 368: * return: -1 error or MessageID
! 369: */
! 370: u_short
! 371: mqtt_readPUBCOMP(mqtt_msg_t * __restrict buf)
! 372: {
! 373: int len, ret;
! 374: struct mqtthdr *hdr;
! 375: mqtt_len_t *v;
! 376: caddr_t pos;
! 377:
! 378: hdr = _mqtt_readHEADER(buf, MQTT_TYPE_PUBCOMP, &ret, &len);
! 379: if (!hdr)
! 380: return (u_short) -1;
! 381: if (len < sizeof(mqtt_len_t)) {
! 382: mqtt_SetErr(EINVAL, "Error:: short message length %d", len);
! 383: return (u_short) -1;
! 384: } else {
! 385: pos = buf->msg_base + ret + 1;
! 386: v = (mqtt_len_t*) pos;
! 387: }
! 388:
! 389: return ntohs(v->val);
! 390: }
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