Example #1
0
func listen(netw, addr string) (fd int, err error) {
	var (
		family   int
		socktype int
		protocol int
		sockaddr syscall.Sockaddr
	)

	netAddr, err := ResolveAddr(netw, addr)
	if err != nil {
		return -1, err
	}

	switch netAddr.(type) {
	case *net.TCPAddr, *net.UDPAddr:
	default:
		return -1, ErrUnsupportedProtocol
	}

	family = sockaddrnet.NetAddrAF(netAddr)
	protocol = sockaddrnet.NetAddrIPPROTO(netAddr)
	sockaddr = sockaddrnet.NetAddrToSockaddr(netAddr)
	socktype = sockaddrnet.NetAddrSOCK(netAddr)

	if fd, err = socket(family, socktype, protocol); err != nil {
		return -1, err
	}

	if err = syscall.Bind(fd, sockaddr); err != nil {
		syscall.Close(fd)
		return -1, err
	}

	if protocol == syscall.IPPROTO_TCP {
		//  by default golang/net sets TCP no delay to true.
		if err = setNoDelay(fd, true); err != nil {
			syscall.Close(fd)
			return -1, err
		}
	}

	if err = syscall.SetNonblock(fd, true); err != nil {
		syscall.Close(fd)
		return -1, err
	}

	return fd, nil
}
Example #2
0
func dial(dialer net.Dialer, netw, addr string) (c net.Conn, err error) {
	var (
		fd             int
		lfamily        int
		rfamily        int
		socktype       int
		lprotocol      int
		rprotocol      int
		file           *os.File
		deadline       time.Time
		remoteSockaddr syscall.Sockaddr
		localSockaddr  syscall.Sockaddr
	)

	netAddr, err := ResolveAddr(netw, addr)
	if err != nil {
		return nil, err
	}

	switch netAddr.(type) {
	case *net.TCPAddr, *net.UDPAddr:
	default:
		return nil, ErrUnsupportedProtocol
	}

	switch {
	case !dialer.Deadline.IsZero():
		deadline = dialer.Deadline
	case dialer.Timeout != 0:
		deadline = time.Now().Add(dialer.Timeout)
	}

	localSockaddr = sockaddrnet.NetAddrToSockaddr(dialer.LocalAddr)
	remoteSockaddr = sockaddrnet.NetAddrToSockaddr(netAddr)

	rfamily = sockaddrnet.NetAddrAF(netAddr)
	rprotocol = sockaddrnet.NetAddrIPPROTO(netAddr)
	socktype = sockaddrnet.NetAddrSOCK(netAddr)

	if dialer.LocalAddr != nil {
		switch dialer.LocalAddr.(type) {
		case *net.TCPAddr, *net.UDPAddr:
		default:
			return nil, ErrUnsupportedProtocol
		}

		// check family and protocols match.
		lfamily = sockaddrnet.NetAddrAF(dialer.LocalAddr)
		lprotocol = sockaddrnet.NetAddrIPPROTO(dialer.LocalAddr)
		if lfamily != rfamily && lprotocol != rfamily {
			return nil, &net.AddrError{Err: "unexpected address type", Addr: netAddr.String()}
		}
	}

	// look at dialTCP in http://golang.org/src/net/tcpsock_posix.go  .... !
	// here we just try again 3 times.
	for i := 0; i < 3; i++ {
		if !deadline.IsZero() && deadline.Before(time.Now()) {
			if err == nil {
				err = errTimeout
			}
			break
		}

		if fd, err = socket(rfamily, socktype, rprotocol); err != nil {
			return nil, err
		}

		if localSockaddr != nil {
			if err = syscall.Bind(fd, localSockaddr); err != nil {
				syscall.Close(fd)
				return nil, err
			}
		}

		if err = syscall.SetNonblock(fd, true); err != nil {
			syscall.Close(fd)
			return nil, err
		}

		if err = connect(fd, remoteSockaddr, deadline); err != nil {
			syscall.Close(fd)
			continue // try again.
		}

		break
	}
	if err != nil {
		return nil, err
	}

	if rprotocol == syscall.IPPROTO_TCP {
		//  by default golang/net sets TCP no delay to true.
		if err = setNoDelay(fd, true); err != nil {
			syscall.Close(fd)
			return nil, err
		}
	}

	// File Name get be nil
	file = os.NewFile(uintptr(fd), filePrefix+strconv.Itoa(os.Getpid()))
	if c, err = net.FileConn(file); err != nil {
		syscall.Close(fd)
		return nil, err
	}

	if err = file.Close(); err != nil {
		syscall.Close(fd)
		c.Close()
		return nil, err
	}

	// c = wrapConnWithRemoteAddr(c, netAddr)
	return c, err
}