version 1.1.2.1, 2012/05/03 08:21:28
|
version 1.4, 2014/04/27 16:29:40
|
Line 1
|
Line 1
|
#include "global.h" |
#include "global.h" |
|
|
|
|
|
#pragma GCC visibility push(hidden) |
|
|
|
int |
|
mqtt_wait4data(int sock, u_short ka, short events) |
|
{ |
|
int ret = 0; |
|
struct pollfd pfd; |
|
|
|
if (sock < 3) |
|
return -1; /* error */ |
|
|
|
pfd.fd = sock; |
|
pfd.events = POLLOUT; |
|
if ((ret = poll(&pfd, 1, ka * 1000)) == -1 || |
|
pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) { |
|
LOGERR; |
|
return -1; /* error */ |
|
} else if (!ret) |
|
return 1; /* timeout */ |
|
|
|
return 0; /* ready */ |
|
} |
|
|
|
#pragma GCC visibility pop |
|
|
|
|
|
/* |
|
* mqtt_KeepAlive() - Keep Alive check routine |
|
* |
|
* @sock = connected socket |
|
* @ka = keep alive timeout |
|
* @tries = tries for receive correct ping response, usually ==1 |
|
* return: -1 error, 0 host is alive, 1 timeout session or 2 broken session |
|
*/ |
|
int |
|
mqtt_KeepAlive(int sock, u_short ka, u_char tries) |
|
{ |
|
int ret = 0; |
|
mqtt_msg_t msg = { NULL, 0 }; |
|
|
|
if (sock < 3) |
|
return -1; /* error */ |
|
|
|
if ((ret = mqtt_wait4data(sock, ka, POLLOUT))) |
|
return ret; |
|
/* ping request */ |
|
if ((ret = mqtt_msgPINGREQ(&msg)) == -1) |
|
return -1; /* error */ |
|
if ((ret = send(sock, msg.msg_base, ret, MSG_NOSIGNAL)) == -1) { |
|
LOGERR; |
|
goto end; |
|
} |
|
|
|
while (tries--) { |
|
if ((ret = mqtt_wait4data(sock, ka, POLLIN | POLLPRI))) { |
|
if (ret == -1) |
|
break; |
|
else |
|
continue; |
|
} |
|
/* receive & decode packet */ |
|
if ((ret = recv(sock, msg.msg_base, msg.msg_len, 0)) == -1) { |
|
LOGERR; |
|
break; |
|
} |
|
if (!mqtt_readPINGRESP(&msg)) { |
|
ret = 0; /* Host is alive */ |
|
break; |
|
} else |
|
ret = 2; /* Session is broken ... must be disconnect! */ |
|
} |
|
end: |
|
free(msg.msg_base); |
|
return ret; |
|
} |
|
|
|
/* |
|
* mqtt_WillMessage() - Publish WILL message |
|
* |
|
* @sock = connected socket |
|
* @ka = keep alive timeout |
|
* @topic = will topic |
|
* @data = will message |
|
* return: -1 error, 1 timeout, 2 not ack or 0 ok |
|
*/ |
|
int |
|
mqtt_WillMessage(int sock, u_short ka, const char *topic, const char *data) |
|
{ |
|
int ret = 0; |
|
mqtt_msg_t msg = { NULL, 0 }; |
|
|
|
if (!topic) |
|
return -1; /* error */ |
|
|
|
/* will message */ |
|
if ((ret = mqtt_wait4data(sock, ka, POLLOUT))) |
|
return ret; |
|
ret = mqtt_msgPUBLISH(&msg, topic, 0xDEAD, 0, 1, 0, data, data ? strlen(data) : 0); |
|
if (ret == -1) |
|
return -1; /* error */ |
|
if ((ret = send(sock, msg.msg_base, ret, MSG_NOSIGNAL)) == -1) { |
|
LOGERR; |
|
free(msg.msg_base); |
|
return -1; /* error */ |
|
} else |
|
memset(msg.msg_base, 0, msg.msg_len); |
|
|
|
/* will ack */ |
|
if ((ret = mqtt_wait4data(sock, ka, POLLIN | POLLPRI))) { |
|
free(msg.msg_base); |
|
return ret; |
|
} |
|
/* receive & decode packet */ |
|
if ((ret = recv(sock, msg.msg_base, msg.msg_len, 0)) == -1) { |
|
LOGERR; |
|
free(msg.msg_base); |
|
return -1; /* error */ |
|
} |
|
if (mqtt_readPUBACK(&msg)) |
|
ret = 0; /* ok */ |
|
else |
|
ret = 2; /* semi-error */ |
|
|
|
free(msg.msg_base); |
|
return ret; |
|
} |