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add first two client side API

    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: cliside.c,v 1.1.2.3 2012/05/01 01:12:16 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, 2012
   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_cli_Open() - Open client connection to MQTT broker
   51:  *
   52:  * @addr = brokers address
   53:  * return: NULL error or !=NULL connected to broker
   54:  */
   55: mqtt_cli_t *
   56: mqtt_cli_Open(struct sockaddr *addr)
   57: {
   58: 	mqtt_cli_t *cli;
   59: 
   60: 	if (!addr)
   61: 		return NULL;
   62: 
   63: 	cli = malloc(sizeof(mqtt_cli_t));
   64: 	if (!cli) {
   65: 		LOGERR;
   66: 		return NULL;
   67: 	} else
   68: 		memset(cli, 0, sizeof(mqtt_cli_t));
   69: 
   70: 	cli->sock = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
   71: 	if (cli->sock == -1) {
   72: 		LOGERR;
   73: 		free(cli);
   74: 		return NULL;
   75: 	}
   76: 	if (connect(cli->sock, addr, addr->sa_len) == -1) {
   77: 		LOGERR;
   78: 		close(cli->sock);
   79: 		free(cli);
   80: 		return NULL;
   81: 	}
   82: 
   83: 	cli->buf = mqtt_msgAlloc(USHRT_MAX);
   84: 	if (!cli->buf) {
   85: 		close(cli->sock);
   86: 		free(cli);
   87: 		return NULL;
   88: 	}
   89: 
   90: 	return cli;
   91: }
   92: 
   93: /*
   94:  * mqtt_cli_Close() - Close client connection
   95:  *
   96:  * @cli = connected client
   97:  * return: -1 error or 0 disconnected client and freed all resources
   98:  */
   99: int
  100: mqtt_cli_Close(mqtt_cli_t ** __restrict cli)
  101: {
  102: 	int siz = 0;
  103: 
  104: 	if (!cli || !*cli)
  105: 		return -1;
  106: 
  107: 	/* send disconnect */
  108: 	siz = mqtt_msgDISCONNECT((*cli)->buf);
  109: 	if (siz > -1) {
  110: 		siz = send((*cli)->sock, (*cli)->buf->msg_base, siz, MSG_NOSIGNAL);
  111: 		if (siz > -1)
  112: 			shutdown((*cli)->sock, SHUT_RDWR);
  113: 	}
  114: 	close((*cli)->sock);
  115: 
  116: 	mqtt_msgFree(&(*cli)->buf, 42);
  117: 
  118: 	free(*cli);
  119: 	*cli = NULL;
  120: 	return 0;
  121: }