int ping_pong(struct vsp_node * node)
{
char ping[64];
int len;
asciiMessage *aM;
struct pollfd pfd;
int rc;
ping[0] = '\0';
len = sprintf(ping, "%d 2 client ping\n", node->queueID);
setNonBlocking(node->fd);
rc = sendControlMessage(node->fd, ping, len, node->tunnel);
clearNonBlocking(node->fd);
if( rc < 0 ) {
dc_debug(DC_ERROR, "Ping failed (control line down).");
return 0;
}
pfd.fd = node->fd;
pfd.events = POLLIN;
rc = poll(&pfd, 1, 1000*10); /* 10 seconds */
if((rc == 1) && (pfd.revents & POLLIN )) {
dcap_set_alarm(10);
aM = getControlMessage(HAVETO, node);
dcap_set_alarm(0);
if( (aM != NULL ) && (aM->type == ASCII_PING) ) {
free(aM->msg);
free(aM);
return 1;
}
}
dc_debug(DC_ERROR, "Ping failed.");
return 0;
}
// nonblocking connect is described in detail in chapter 15.4 of stevens unix network programming
bool IPv4Socket::connect_nb(const std::string &host, uint16_t port)
{
LOG_DEBUG("IPv4Socket::connect_nb "<< host.c_str() << ":" << port);
connectionInProgress_ = true;
struct sockaddr *saddr = 0;
struct sockaddr_in inaddr;
setup_sockaddr_v4_(inaddr, host, port);
socklen_t len = sizeof(sockaddr_in);
saddr = (struct sockaddr *) &inaddr;
setNonBlocking();
int res = rs_connect(sock_, saddr, len);
if (res == 0)
{
connectionInProgress_ = false;
clearNonBlocking();
return true;
}
const int err = getErrorNumber();
#ifdef WIN32
if (err == WSAEWOULDBLOCK)
return true;
if (err != WSAEINPROGRESS && err != WSAEINTR) {
#else
if (err != EINPROGRESS && err != EINTR) {
#endif
std::stringstream ss;
ss << host << ":" << port;
std::string str = ss.str();
throw ConnectionRefusedError("Failure to connect to", str.c_str(), err);
};
return false;
}
}