Annotation of libaitmqtt/src/cmds.c, revision 1.4.2.2
1.4.2.1 misho 1: /*************************************************************************
2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
1.4.2.2 ! misho 6: * $Id: cmds.c,v 1.4.2.1 2022/09/15 15:04:44 misho Exp $
1.4.2.1 misho 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 - 2022
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: */
1.2 misho 46: #include "global.h"
47:
48:
49: #pragma GCC visibility push(hidden)
50:
1.4 misho 51: int
1.2 misho 52: mqtt_wait4data(int sock, u_short ka, short events)
53: {
54: int ret = 0;
55: struct pollfd pfd;
56:
57: if (sock < 3)
58: return -1; /* error */
59:
60: pfd.fd = sock;
61: pfd.events = POLLOUT;
62: if ((ret = poll(&pfd, 1, ka * 1000)) == -1 ||
63: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
64: LOGERR;
65: return -1; /* error */
66: } else if (!ret)
67: return 1; /* timeout */
68:
69: return 0; /* ready */
70: }
71:
72: #pragma GCC visibility pop
73:
74:
75: /*
76: * mqtt_KeepAlive() - Keep Alive check routine
77: *
78: * @sock = connected socket
79: * @ka = keep alive timeout
80: * @tries = tries for receive correct ping response, usually ==1
81: * return: -1 error, 0 host is alive, 1 timeout session or 2 broken session
82: */
83: int
84: mqtt_KeepAlive(int sock, u_short ka, u_char tries)
85: {
86: int ret = 0;
1.4.2.1 misho 87: mqtt_msg_t *msg = NULL;
1.2 misho 88:
89: if (sock < 3)
90: return -1; /* error */
91:
1.4.2.2 ! misho 92: if ((ret = mqtt_wait4data(sock, ka, POLLOUT)))
1.2 misho 93: return ret;
94: /* ping request */
1.4.2.1 misho 95: if (!(msg = mqtt_msgPINGREQ()))
1.2 misho 96: return -1; /* error */
1.4.2.1 misho 97: if ((ret = send(sock, msg->msg_base, msg->msg_len, MSG_NOSIGNAL)) == -1) {
1.2 misho 98: LOGERR;
99: goto end;
1.4.2.1 misho 100: } else
101: mqtt_msgFree(&msg, 0);
1.2 misho 102:
103: while (tries--) {
104: if ((ret = mqtt_wait4data(sock, ka, POLLIN | POLLPRI))) {
105: if (ret == -1)
106: break;
107: else
108: continue;
109: }
110: /* receive & decode packet */
1.4.2.1 misho 111: msg = mqtt_msgAlloc(BUFSIZ);
112: if ((ret = recv(sock, msg->msg_base, msg->msg_len, 0)) == -1) {
1.2 misho 113: LOGERR;
114: break;
115: }
1.4.2.2 ! misho 116: if (!mqtt_readPINGRESP(msg)) {
1.2 misho 117: ret = 0; /* Host is alive */
118: break;
119: } else
120: ret = 2; /* Session is broken ... must be disconnect! */
121: }
122: end:
1.4.2.1 misho 123: mqtt_msgFree(&msg, 0);
1.2 misho 124: return ret;
125: }
1.3 misho 126:
127: /*
128: * mqtt_WillMessage() - Publish WILL message
129: *
130: * @sock = connected socket
131: * @ka = keep alive timeout
132: * @topic = will topic
133: * @data = will message
134: * return: -1 error, 1 timeout, 2 not ack or 0 ok
135: */
136: int
137: mqtt_WillMessage(int sock, u_short ka, const char *topic, const char *data)
138: {
139: int ret = 0;
1.4.2.2 ! misho 140: mqtt_msg_t *msg = NULL;
1.3 misho 141:
142: if (!topic)
143: return -1; /* error */
144:
145: /* will message */
146: if ((ret = mqtt_wait4data(sock, ka, POLLOUT)))
147: return ret;
1.4.2.2 ! misho 148: msg = mqtt_msgPUBLISH(topic, 0xDEAD, 0, 1, 0, data, data ? strlen(data) : 0);
! 149: if (!msg)
1.3 misho 150: return -1; /* error */
1.4.2.2 ! misho 151: if ((ret = send(sock, msg->msg_base, msg->msg_len, MSG_NOSIGNAL)) == -1) {
1.3 misho 152: LOGERR;
1.4.2.2 ! misho 153: mqtt_msgFree(&msg, 0);
1.3 misho 154: return -1; /* error */
155: } else
1.4.2.2 ! misho 156: mqtt_msgFree(&msg, 0);
1.3 misho 157:
158: /* will ack */
1.4.2.2 ! misho 159: if ((ret = mqtt_wait4data(sock, ka, POLLIN | POLLPRI)))
1.3 misho 160: return ret;
161: /* receive & decode packet */
1.4.2.2 ! misho 162: msg = mqtt_msgAlloc(BUFSIZ);
! 163: if ((ret = recv(sock, msg->msg_base, msg->msg_len, 0)) == -1) {
1.3 misho 164: LOGERR;
1.4.2.2 ! misho 165: mqtt_msgFree(&msg, 0);
1.3 misho 166: return -1; /* error */
167: }
1.4.2.2 ! misho 168: if (mqtt_readPUBACK(msg))
1.3 misho 169: ret = 0; /* ok */
170: else
171: ret = 2; /* semi-error */
172:
1.4.2.2 ! misho 173: mqtt_msgFree(&msg, 0);
1.3 misho 174: return ret;
175: }
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