File:
[ELWIX - Embedded LightWeight unIX -] /
libaitmqtt /
src /
cliside.c
Revision
1.3:
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Thu Jun 28 11:06:17 2012 UTC (11 years, 10 months ago) by
misho
Branches:
MAIN
CVS tags:
mqtt1_8,
mqtt1_7,
mqtt1_6,
mqtt1_5,
mqtt1_4,
mqtt1_3,
MQTT1_7,
MQTT1_6,
MQTT1_5,
MQTT1_4,
MQTT1_3,
MQTT1_2,
HEAD
ver 1.2
/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
* by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: cliside.c,v 1.3 2012/06/28 11:06:17 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:
All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
by Michael Pounov <misho@elwix.org>. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"
/*
* mqtt_cli_Open() - Open client connection to MQTT broker
*
* @addr = brokers address
* @timeout = timeout
* return: NULL error or !=NULL connected to broker
*/
mqtt_cli_t *
mqtt_cli_Open(struct sockaddr *addr, u_short timeout)
{
mqtt_cli_t *cli;
if (!addr)
return NULL;
cli = malloc(sizeof(mqtt_cli_t));
if (!cli) {
LOGERR;
return NULL;
} else
memset(cli, 0, sizeof(mqtt_cli_t));
cli->timeout = timeout;
cli->sock = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
if (cli->sock == -1) {
LOGERR;
free(cli);
return NULL;
}
if (connect(cli->sock, addr, addr->sa_len) == -1) {
LOGERR;
close(cli->sock);
free(cli);
return NULL;
}
cli->buf = mqtt_msgAlloc(USHRT_MAX);
if (!cli->buf) {
close(cli->sock);
free(cli);
return NULL;
}
return cli;
}
/*
* mqtt_cli_Close() - Close client connection
*
* @cli = connected client
* return: -1 error or 0 disconnected client and freed all resources
*/
int
mqtt_cli_Close(mqtt_cli_t ** __restrict cli)
{
int siz = 0;
if (!cli || !*cli)
return -1;
/* send disconnect */
siz = mqtt_msgDISCONNECT((*cli)->buf);
if (siz > -1) {
siz = send((*cli)->sock, (*cli)->buf->msg_base, siz, MSG_NOSIGNAL);
if (siz > -1)
shutdown((*cli)->sock, SHUT_RDWR);
}
close((*cli)->sock);
mqtt_msgFree(&(*cli)->buf, 42);
free(*cli);
*cli = NULL;
return 0;
}
/*
* mqtt_cli_Subscribe() - Subscribe to broker
*
* @cli = connected client
* @Topics = Topics for subscribes
* @msgID = Message ID
* @Dup = Duplicated request
* @QoS = Message QoS
* return: NULL error or !=NULL allocated array with subscribed QoS responses,
* must be free() result!
*/
u_char *
mqtt_cli_Subscribe(mqtt_cli_t * __restrict cli, mqtt_subscr_t * __restrict Topics,
u_short msgID, u_char Dup, u_char QoS)
{
int siz = 0;
u_short mid = 0;
u_char *qoses = NULL;
if (!cli || !Topics)
return NULL;
/* send subscribe */
siz = mqtt_msgSUBSCRIBE(cli->buf, Topics, msgID, Dup, QoS);
if (siz == -1)
return NULL;
siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
if (siz == -1) {
LOGERR;
return NULL;
} else
memset(cli->buf->msg_base, 0, cli->buf->msg_len);
if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
return NULL;
} else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1))
return NULL;
/* receive suback */
siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
if (siz == -1) {
LOGERR;
return NULL;
}
siz = mqtt_readSUBACK(cli->buf, &mid, &qoses);
if (siz == -1)
return NULL;
if (msgID != mid) {
free(qoses);
mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, mid);
return NULL;
}
return qoses;
}
/*
* mqtt_cli_Unsubscribe() - Unsubscribe from broker
*
* @cli = connected client
* @Topics = Topics for unsubscribes
* @msgID = Message ID
* @Dup = Duplicated request
* @QoS = Message QoS
* return: -1 error or 0 ok
*/
int
mqtt_cli_Unsubscribe(mqtt_cli_t * __restrict cli, mqtt_subscr_t * __restrict Topics,
u_short msgID, u_char Dup, u_char QoS)
{
int siz = 0;
if (!cli || !Topics)
return -1;
/* send unsubscribe */
siz = mqtt_msgUNSUBSCRIBE(cli->buf, Topics, msgID, Dup, QoS);
if (siz == -1)
return -1;
siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
if (siz == -1) {
LOGERR;
return -1;
} else
memset(cli->buf->msg_base, 0, cli->buf->msg_len);
if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
return -1;
} else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1))
return -1;
/* receive unsuback */
siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
if (siz == -1) {
LOGERR;
return -1;
}
siz = mqtt_readUNSUBACK(cli->buf);
if (siz == -1)
return -1;
if (msgID != siz) {
mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
return -1;
}
return 0;
}
/*
* mqtt_cli_Publish() - Publish message to broker
*
* @cli = connected client
* @msgID = Message ID
* @Dup = Duplicated request
* @QoS = Message QoS
* @Retain = Retain message
* @csTopic = Topic
* @pData = Data
* @datLen = Data length
* return: -1 error or > -1 sended bytes
*/
int
mqtt_cli_Publish(mqtt_cli_t * __restrict cli, u_short msgID, u_char Dup, u_char QoS, u_char Retain,
const char *csTopic, const void *pData, int datLen)
{
int wlen = 0, siz = 0;
if (!cli || !csTopic)
return -1;
/* send publish */
siz = mqtt_msgPUBLISH(cli->buf, csTopic, msgID, Dup, QoS, Retain, pData, datLen);
if (siz == -1)
return -1;
siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
if (siz == -1) {
LOGERR;
return -1;
} else {
wlen = siz;
memset(cli->buf->msg_base, 0, cli->buf->msg_len);
}
if (QoS == MQTT_QOS_ONCE) /* no reply */
goto end;
if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
return -1;
} else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1))
return -1;
/* receive PUBxxx */
siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
if (siz == -1) {
LOGERR;
return -1;
}
if (QoS == MQTT_QOS_ACK) { /* reply with PUBACK */
siz = mqtt_readPUBACK(cli->buf);
if (siz == -1)
return -1;
if (msgID != siz) {
mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
return -1;
}
goto end;
} else { /* reply with PUBREC */
siz = mqtt_readPUBREC(cli->buf);
if (siz == -1)
return -1;
if (msgID != siz) {
mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
return -1;
}
}
do {
/* send publish release QoS == 2 */
siz = mqtt_msgPUBREL(cli->buf, msgID);
if (siz == -1)
return -1;
siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
if (siz == -1) {
LOGERR;
return -1;
} else
memset(cli->buf->msg_base, 0, cli->buf->msg_len);
if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
return -1;
} else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1)) {
if (Dup++ > 1)
return -1;
else
continue;
}
/* receive PUBCOMP */
siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
if (siz == -1) {
LOGERR;
return -1;
}
siz = mqtt_readPUBCOMP(cli->buf);
if (siz == -1)
return -1;
if (msgID != siz) {
mqtt_SetErr(ECANCELED, "Receive different message ID %hu != %hu", msgID, siz);
if (Dup++ > 1)
return -1;
else
continue;
}
} while (0);
end:
return wlen;
}
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