Added --input-raw-ignore-interface option to skip network interfaces

In k8 environment, when listening as daemonset, k8s creates a bunch of virtual interfaccess for your traffic with random names, but in addition it has a classical eth0, or NAT ones like cbr0, which you do not want to listen.

With this option you now can listen traffic on all virtual interfaces and ignore internal k8s traffic. Example:
`--input-raw-ignore-interface cbr0 --input-raw-ignore-interface eth0 --input-raw-ignore-interface localhost`

capture/capture.go

@@ -59,6 +59,7 @@ type PcapOptions struct {
 	RealIPHeader    string          `json:"input-raw-realip-header"`
 	Stats           bool            `json:"input-raw-stats"`
 	AllowIncomplete bool            `json:"input-raw-allow-incomplete"`
+	IgnoreInterface []string        `json:"input-raw-ignore-interface"`
 	Transport       string
 }
 
@@ -598,6 +599,18 @@ func (l *Listener) setInterfaces() (err error) {
 	}
 
 	for _, pi := range pifis {
+		ignore := false
+		for _, ig := range l.config.IgnoreInterface {
+			if pi.Name == ig {
+				ignore = true
+				break
+			}
+		}
+
+		if ignore {
+			continue
+		}
+
 		if isDevice(l.host, pi) {
 			l.Interfaces = []pcap.Interface{pi}
 			return

input_raw.go

@@ -15,9 +15,7 @@ import (
 )
 
 // RAWInputConfig represents configuration that can be applied on raw input
-type RAWInputConfig struct {
-	capture.PcapOptions
-}
+type RAWInputConfig = capture.PcapOptions
 
 // RAWInput used for intercepting traffic for given address
 type RAWInput struct {
@@ -116,7 +114,7 @@ func (i *RAWInput) PluginRead() (*Message, error) {
 
 func (i *RAWInput) listen(address string) {
 	var err error
-	i.listener, err = capture.NewListener(i.host, i.ports, i.config.PcapOptions)
+	i.listener, err = capture.NewListener(i.host, i.ports, i.config)
 	if err != nil {
 		log.Fatal(err)
 	}

plugins_test.go

@@ -5,10 +5,10 @@ import (
 )
 
 func TestPluginsRegistration(t *testing.T) {
-	Settings.InputDummy = MultiOption{"[]"}
-	Settings.OutputDummy = MultiOption{"[]"}
-	Settings.OutputHTTP = MultiOption{"www.example.com|10"}
-	Settings.InputFile = MultiOption{"/dev/null"}
+	Settings.InputDummy = []string{"[]"}
+	Settings.OutputDummy = []string{"[]"}
+	Settings.OutputHTTP = []string{"www.example.com|10"}
+	Settings.InputFile = []string{"/dev/null"}
 
 	plugins := NewPlugins()
 

settings.go

@@ -191,6 +191,7 @@ func init() {
 	flag.BoolVar(&Settings.InputRAWConfig.Monitor, "input-raw-monitor", false, "enable RF monitor mode")
 	flag.BoolVar(&Settings.InputRAWConfig.Stats, "input-raw-stats", false, "enable stats generator on raw TCP messages")
 	flag.BoolVar(&Settings.InputRAWConfig.AllowIncomplete, "input-raw-allow-incomplete", false, "If turned on Gor will record HTTP messages with missing packets")
+	flag.Var(&MultiOption{&Settings.InputRAWConfig.IgnoreInterface}, "input-raw-ignore-interface", "In case if you want listen for all interfaces except a few ones. Can be used in k8s environment. Example: --input-raw-ignore-interface cbr0 --input-raw-ignore-interface eth0 --input-raw-ignore-interface localhost")
 
 	flag.StringVar(&Settings.Middleware, "middleware", "", "Used for modifying traffic using external command")