/************************************************************************* * (C) 2011 AITNET ltd - Sofia/Bulgaria - * by Michael Pounov * * $Author: misho $ * $Id: cliside.c,v 1.1.2.5 2012/05/08 11:29:56 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 Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 by Michael Pounov . 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 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; } 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(EBADMSG, "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; u_short mid = 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; } 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(EBADMSG, "Receive different message ID %hu != %hu", msgID, mid); return -1; } return 0; }