func()

in pcap-cli/internal/transformer/translator_worker.go [182:243]

• 54 lines of code
• 20 McCabe index (conditional complexity)

func (w *pcapTranslatorWorker) translateLayer(
	ctx context.Context, layer gopacket.LayerType, deep bool,
) fmt.Stringer {
	// confirm that the packet actually contains the requested layer
	l := w.asLayer(ctx, layer)
	if l == nil {
		return nil
	}

	switch lType := l.(type) {
	default:
		return nil
	case *layers.Ethernet:
		return w.translator.translateEthernetLayer(ctx, lType)
	case *layers.ARP:
		return w.translator.translateARPLayer(ctx, lType)
	case *layers.IPv4:
		return w.translator.translateIPv4Layer(ctx, lType)
	case *layers.IPv6:
		return w.translator.translateIPv6Layer(ctx, lType)
	case *layers.ICMPv4:
		return w.translator.translateICMPv4Layer(ctx, lType)
	case *layers.ICMPv6:
		icmp6 := w.translator.translateICMPv6Layer(ctx, lType)

		// [ToDo]: handle layers.ICMPv6TypePacketTooBig
		if lType.TypeCode.Type() == layers.ICMPv6TypeDestinationUnreachable ||
			lType.TypeCode.Type() == layers.ICMPv6TypeTimeExceeded {
			return w.translator.translateICMPv6L3HeaderLayer(ctx, icmp6, lType)
		}

		if !deep {
			return icmp6
		}

		_l := w.asLayer(ctx, lType.NextLayerType())

		switch _lType := _l.(type) {
		default:
			return icmp6
		case *layers.ICMPv6Echo:
			return w.translator.translateICMPv6EchoLayer(ctx, icmp6, _lType)
		case *layers.ICMPv6Redirect:
			return w.translator.translateICMPv6RedirectLayer(ctx, icmp6, _lType)
		}
	case *layers.ICMPv6Echo:
		return w.translator.translateICMPv6EchoLayer(ctx, nil, lType)
	case *layers.ICMPv6Redirect:
		return w.translator.translateICMPv6RedirectLayer(ctx, nil, lType)
	case *layers.TCP:
		return w.translator.translateTCPLayer(ctx, lType)
	case *layers.UDP:
		return w.translator.translateUDPLayer(ctx, lType)
	case *layers.DNS:
		return w.translator.translateDNSLayer(ctx, lType)
	case *layers.TLS:
		return w.translator.translateTLSLayer(ctx, lType)
	case *gopacket.DecodeFailure:
		// see: https://github.com/google/gopacket/blob/v1.1.19/decode.go#L118-L126
		return w.translator.translateErrorLayer(ctx, lType)
	}
}