static TCPConnection* TCPConnection_Host_checkNewPeerLink(TCPConnection* tcp,const char*& out_peerName,long& peerPort){
#ifdef WIN32
typedef int TAcceptSizeType;
#else
typedef unsigned int TAcceptSizeType;
#endif
struct sockaddr peer_addr;
TAcceptSizeType peer_addrLen=(TAcceptSizeType)sizeof(peer_addr);
memset(&peer_addr,0,peer_addrLen);
TSOCKET peer_sockFD=accept(tcp->sockFD,&peer_addr,&peer_addrLen);
if (peer_sockFD<0)
return 0;
else {
TCPConnection* peerTCP=TCPConnection_create();
peerTCP->sockFD=peer_sockFD;
peerTCP->addr=*(sockaddr_in*)&peer_addr;
peerTCP->he=gethostbyaddr((const char*)&(peerTCP->addr.sin_addr),sizeof(peerTCP->addr.sin_addr),AF_INET);
out_peerName=peerTCP->he->h_name;
//const char* peerName=inet_ntoa(peerTCP->addr.sin_addr);
//out_peerName=peerName;
peerPort=peerTCP->addr.sin_port;
return peerTCP;
}
}
inline TCPConnection*
TCPConnection_connect (CString host, uint16 port)
{
const int fd = socket(AF_INET, SOCK_STREAM, 0);
report_zero_if(ERROR_MESSAGE("socket"), fd == -1);
// Make it so that we can early-return from this scope using one-liners.
struct Cleanup
{
explicit Cleanup (int fd)
: ok(false), fd(fd)
{}
~Cleanup ()
{
return_if(ok);
close(fd);
}
bool ok;
int fd;
}
cleanup(fd);
// FIXME: Use the IPv6-compliant getaddrinfo.
struct hostent* ip = ::gethostbyname(host);
report_zero_if(ERROR_MESSAGE("gethostbyname"), ip == NULL);
sockaddr_in address;
address.sin_family = AF_INET;
memcpy(&address.sin_addr, ip->h_addr_list[0], ip->h_length);
address.sin_port = htons(port);
{
// Put the socket into non-blocking mode.
int flags = fcntl(fd, F_GETFL, 0);
int status = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
report_zero_if(ERROR_MESSAGE("fcntl"), status < 0);
}
{
// Perform the non-blocking connection dance.
int status = 0;
do
{
status = ::connect(fd, (sockaddr*) &address, sizeof(address));
}
while (-1 == status && EINTR == errno); // In the extreme case where connect got interrupted by a signal.
if (0 != status) // TCPConnection did not immediately succeed.
{
switch (errno) // Investigate the error, and take action.
{
case EINPROGRESS: // The connection is in progress.
{
static const int connectionTimeoutInMilliseconds = 500;
// Poll the socket for writing, with a timeout.
const int ret = select_single_write(fd, connectionTimeoutInMilliseconds);
// Select might actually have returned EINPROGRESS, here.
// Currently, we behave as if the connection failed when it times out.
// FIXME: Introduce an asynchronous callback connection mechanism in parallel to this blocking one.
// Abort if select failed.
report_zero_unless(ERROR_MESSAGE("select"), 0 < ret);
// Also abort if select returned with a descriptor not ready for writing.
report_zero_if("Connection timed out.", 0 == ret);
// Make sure that the connection is error-free.
int err = 0;
socklen_t len = sizeof(int);
report_zero_unless(ERROR_MESSAGE("getsockopt"), 0 == getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len));
report_zero_unless(formatted("connect: %s", strerror(err)).get(), 0 == err);
break; // The connection is now established.
}
default: // The connection failed for other reasons.
{
uplink_log_error(ERROR_MESSAGE("connect"));
return 0;
}
}
}
}
{
// Put the socket back into blocking mode.
int flags = fcntl(fd, F_GETFL, 0);
int status = fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
report_zero_if(ERROR_MESSAGE("fcntl"), status < 0);
}
cleanup.ok = true;
return TCPConnection_create(fd);
}
TNetLinkImportHandle netLink_create(){
TCPConnection* tcp=TCPConnection_create();
return tcp;
}