func ethrDialEx()

in utils.go [364:409]
46 lines of code
8 McCabe index (conditional complexity)

func ethrDialEx(p EthrProtocol, dialAddr, localIP string, localPortNum uint16, ttl int, tos int) (conn net.Conn, err error) {
	localAddr := fmt.Sprintf("%v:%v", localIP, localPortNum)
	var la net.Addr
	network := Tcp()
	if p == TCP {
		la, err = net.ResolveTCPAddr(network, localAddr)
	} else if p == UDP {
		network = Udp()
		la, err = net.ResolveUDPAddr(network, localAddr)
	} else {
		ui.printDbg("Only TCP or UDP are allowed in ethrDial")
		err = os.ErrInvalid
		return
	}
	if err != nil {
		ui.printErr("Unable to resolve TCP or UDP address. Error: %v", err)
		return
	}
	dialer := &net.Dialer{
		Control: func(network, address string, c syscall.RawConn) error {
			return c.Control(func(fd uintptr) {
				ethrSetTTL(fd, ttl)
				ethrSetTOS(fd, tos)
			})
		},
	}
	dialer.LocalAddr = la
	dialer.Timeout = time.Second
	conn, err = dialer.Dial(network, dialAddr)
	if err != nil {
		ui.printDbg("ethrTCPDial Error: %v", err)
	} else {
		tcpconn, ok := conn.(*net.TCPConn)
		if ok {
			tcpconn.SetLinger(0)
		}
		udpconn, ok := conn.(*net.UDPConn)
		if ok {
			err = udpconn.SetWriteBuffer(4 * 1024 * 1024)
			if err != nil {
				ui.printDbg("Failed to set ReadBuffer on UDP socket: %v", err)
			}
		}
	}
	return
}