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 1.1.2.4 2012/05/08 09:07:31 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: * @timeout = timeout
54: * return: NULL error or !=NULL connected to broker
55: */
56: mqtt_cli_t *
57: mqtt_cli_Open(struct sockaddr *addr, u_short timeout)
58: {
59: mqtt_cli_t *cli;
60:
61: if (!addr)
62: return NULL;
63:
64: cli = malloc(sizeof(mqtt_cli_t));
65: if (!cli) {
66: LOGERR;
67: return NULL;
68: } else
69: memset(cli, 0, sizeof(mqtt_cli_t));
70:
71: cli->timeout = timeout;
72: cli->sock = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
73: if (cli->sock == -1) {
74: LOGERR;
75: free(cli);
76: return NULL;
77: }
78: if (connect(cli->sock, addr, addr->sa_len) == -1) {
79: LOGERR;
80: close(cli->sock);
81: free(cli);
82: return NULL;
83: }
84:
85: cli->buf = mqtt_msgAlloc(USHRT_MAX);
86: if (!cli->buf) {
87: close(cli->sock);
88: free(cli);
89: return NULL;
90: }
91:
92: return cli;
93: }
94:
95: /*
96: * mqtt_cli_Close() - Close client connection
97: *
98: * @cli = connected client
99: * return: -1 error or 0 disconnected client and freed all resources
100: */
101: int
102: mqtt_cli_Close(mqtt_cli_t ** __restrict cli)
103: {
104: int siz = 0;
105:
106: if (!cli || !*cli)
107: return -1;
108:
109: /* send disconnect */
110: siz = mqtt_msgDISCONNECT((*cli)->buf);
111: if (siz > -1) {
112: siz = send((*cli)->sock, (*cli)->buf->msg_base, siz, MSG_NOSIGNAL);
113: if (siz > -1)
114: shutdown((*cli)->sock, SHUT_RDWR);
115: }
116: close((*cli)->sock);
117:
118: mqtt_msgFree(&(*cli)->buf, 42);
119:
120: free(*cli);
121: *cli = NULL;
122: return 0;
123: }
124:
125: /*
126: * mqtt_cli_Subscribe() - Subscribe to broker
127: *
128: * @cli = connected client
129: * @Topics = Topics for subscribes
130: * @msgID = Message ID
131: * @Dup = Duplicated request
132: * @QoS = Message QoS
133: * return: NULL error or !=NULL allocated array with subscribed QoS responses,
134: * must be free() result!
135: */
136: u_char *
137: mqtt_cli_Subscribe(mqtt_cli_t * __restrict cli, mqtt_subscr_t * __restrict Topics,
138: u_short msgID, u_char Dup, u_char QoS)
139: {
140: int siz = 0;
141: u_short mid = 0;
142: u_char *qoses = NULL;
143:
144: if (!cli)
145: return NULL;
146:
147: /* send subscribe */
148: siz = mqtt_msgSUBSCRIBE(cli->buf, Topics, msgID, Dup, QoS);
149: if (siz == -1)
150: return NULL;
151: siz = send(cli->sock, cli->buf->msg_base, siz, MSG_NOSIGNAL);
152: if (siz == -1) {
153: LOGERR;
154: return NULL;
155: }
156:
157: if ((siz = mqtt_wait4data(cli->sock, cli->timeout, POLLIN | POLLPRI)) == -1) {
158: return NULL;
159: } else if (siz && mqtt_KeepAlive(cli->sock, cli->timeout, 1))
160: return NULL;
161:
162: /* receive suback */
163: siz = recv(cli->sock, cli->buf->msg_base, cli->buf->msg_len, 0);
164: if (siz == -1) {
165: LOGERR;
166: return NULL;
167: }
168: siz = mqtt_readSUBACK(cli->buf, &mid, &qoses);
169: if (siz == -1)
170: return NULL;
171: if (msgID != mid) {
172: free(qoses);
173: mqtt_SetErr(EBADMSG, "Receive different message ID %hu != %hu", msgID, mid);
174: return NULL;
175: }
176:
177: return qoses;
178: }
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