func NewPcap()

in pcap-cli/pkg/pcap/gopacket_engine.go [222:254]

• 26 lines of code
• 8 McCabe index (conditional complexity)

func NewPcap(config *PcapConfig) (PcapEngine, error) {
	var isActive atomic.Bool
	isActive.Store(false)

	debug := config.Debug
	if debugEnvVar, err := strconv.ParseBool(os.Getenv("PCAP_DEBUG")); err == nil {
		config.Debug = debug || debugEnvVar
	}

	// `config.Ephemerals` is already a safe type,
	// here the validation only enforces correctness of port range.
	if config.Ephemerals == nil ||
		config.Ephemerals.Min < pcap_min_ephemeral_port ||
		config.Ephemerals.Min >= config.Ephemerals.Max {
		config.Ephemerals = &PcapEphemeralPorts{
			Min: PCAP_MIN_EPHEMERAL_PORT,
			Max: PCAP_MAX_EPHEMERAL_PORT,
		}
	}

	pcap := Pcap{config: config, isActive: &isActive}

	if strings.EqualFold(config.Iface, anyDeviceName) {
		config.Device = nil
	} else {
		devices, err := FindDevicesByName(&config.Iface)
		if err == nil {
			config.Device = devices[0]
		}
	}

	return &pcap, nil
}