func runClient()

in client.go [120:165]
45 lines of code
10 McCabe index (conditional complexity)

func runClient(testID EthrTestID, title string, clientParam EthrClientParam, server string) {
	initClient(title)
	hostName, hostIP, port, err := getServerIPandPort(server)
	if err != nil {
		return
	}
	ip := net.ParseIP(hostIP)
	if ip != nil {
		if ip.To4() != nil {
			gIPVersion = ethrIPv4
		} else {
			gIPVersion = ethrIPv6
		}
	} else {
		return
	}

	if gIsExternalClient {
		if testID.Protocol != ICMP && port == "" {
			ui.printErr("In external mode, port cannot be empty for TCP tests.")
			return
		}
	} else {
		if port != "" {
			ui.printErr("In client mode, port (%s) cannot be specified in destination (%s).", port, server)
			ui.printMsg("Hint: Use external mode (-x).")
			return
		}
		port = gEthrPortStr
	}
	ui.printMsg("Using destination: %s, ip: %s, port: %s", hostName, hostIP, port)
	test, err := newTest(hostIP, testID, clientParam)
	if err != nil {
		ui.printErr("Failed to create the new test.")
		return
	}
	test.remoteAddr = server
	test.remoteIP = hostIP
	test.remotePort = port
	if testID.Protocol == ICMP {
		test.dialAddr = hostIP
	} else {
		test.dialAddr = fmt.Sprintf("[%s]:%s", hostIP, port)
	}
	runTest(test)
}