add go vet

fix drone
burble.dn42 customizations
2022-01-27 15:16:02 +00:00 · 2022-01-27 15:16:02 +00:00 · 2022-01-27 15:16:02 +00:00 · 2022-01-09 08:49:20 -05:00 · 2022-01-09 08:32:25 -05:00 · 2022-01-07 07:20:32 -05:00
29 changed files with 2047 additions and 505 deletions
--- a/.drone.yml
+++ b/.drone.yml
@ -0,0 +1,55 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+ - name: build
+   image: golang
+   environment:
+     CGO_ENABLED: 0
+   commands:
+    - go vet
+    - go build
+
+ - name: upload binary
+   image: plugins/s3
+   settings:
+     bucket: artifacts
+     access_key:
+       from_secret: MINIO_ACCESS_KEY
+     secret_key:
+       from_secret: MINIO_SECRET_KEY
+     endpoint: https://minio.burble.dn42
+     region: uk-lon3
+     path_style: true
+     source: pndpd
+     target: /pndpd/${DRONE_BRANCH}
+
+ - name: upload service
+   image: plugins/s3
+   settings:
+     bucket: artifacts
+     access_key:
+       from_secret: MINIO_ACCESS_KEY
+     secret_key:
+       from_secret: MINIO_SECRET_KEY
+     endpoint: https://minio.burble.dn42
+     region: uk-lon3
+     path_style: true
+     source: pndpd.service
+     target: /pndpd/${DRONE_BRANCH}
+
+---
+kind: secret
+name: MINIO_ACCESS_KEY
+get:
+  path: burble.dn42/kv/data/drone/minio
+  name: ACCESS_KEY
+
+---
+kind: secret
+name: MINIO_SECRET_KEY
+get:
+  path: burble.dn42/kv/data/drone/minio
+  name: SECRET_KEY
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,7 @@
+*.iml
+.idea
+
+bin/
+
+*~
+pndpd
--- a/.idea/.gitignore
+++ b/.idea/.gitignore
@ -1,8 +0,0 @@
-# Default ignored files
-/shelf/
-/workspace.xml
-# Editor-based HTTP Client requests
-/httpRequests/
-# Datasource local storage ignored files
-/dataSources/
-/dataSources.local.xml
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/pndpd.iml" filepath="$PROJECT_DIR$/.idea/pndpd.iml" />
-    </modules>
-  </component>
-</project>
--- a/.idea/pndpd.iml
+++ b/.idea/pndpd.iml
@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="WEB_MODULE" version="4">
-  <component name="Go" enabled="true" />
-  <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$" />
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>
--- a/.idea/remote-targets.xml
+++ b/.idea/remote-targets.xml
@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RemoteTargetsManager">
-    <targets>
-      <target name="WSL - Debian" type="wsl" uuid="c04b0bc9-8ac6-47f9-8b32-9b096370586f">
-        <config>
-          <option name="distributionMsId" value="Debian" />
-          <option name="projectRootOnTarget" value="/mnt/c/Users/Main/AppData/Local/JetBrains/Toolbox/apps/Goland/ch-0/213.5744.269/jbr/bin&#10;/pndpd" />
-        </config>
-        <ContributedStateBase type="GoLanguageRuntime">
-          <config>
-            <option name="goPath" value="/home/main/go" />
-            <option name="goRoot" value="/usr/local/go/bin/go" />
-            <option name="goVersion" value="go1.17.5 linux/amd64" />
-          </config>
-        </ContributedStateBase>
-      </target>
-    </targets>
-  </component>
-</project>
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
--- a/674
+++ b/674
@ -0,0 +1,674 @@
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+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    {{ project }}  Copyright (C) {{ year }}  {{ organization }}
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
--- a/21
+++ b/21
@ -0,0 +1,21 @@
+# Makefile for PNDPD
+
+BINARY=pndpd
+MODULES=
+VERSION=`git describe --tags`
+LDFLAGS=-ldflags "-X main.Version=${VERSION}"
+
+build:
+	go build -tags=${MODULES} -o bin/${BINARY} .
+
+release:
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -tags=${MODULES} ${LDFLAGS} -o bin/${BINARY}_${VERSION}_linux_amd64.bin .
+
+release-all:
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -tags=${MODULES} ${LDFLAGS} -o bin/${BINARY}_${VERSION}_linux_amd64.bin
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -tags=${MODULES} ${LDFLAGS} -o bin/${BINARY}_${VERSION}_linux_arm64.bin
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -tags=${MODULES} ${LDFLAGS} -o bin/${BINARY}_${VERSION}_linux_arm.bin
+
+clean:
+	find bin/ -type f -delete
+	if [ -d "bin/" ]; then rm -d bin/ ;fi
--- a/NDPRequest.go
+++ b/NDPRequest.go
@ -1,18 +0,0 @@
-package main
-
-type NDPType int
-
-const (
-	NDP_ADV NDPType = 0
-	NDP_SOL NDPType = 1
-)
-
-type NDRequest struct {
-	requestType      NDPType
-	srcIP            []byte
-	answeringForIP   []byte
-	dstIP            []byte
-	mac              []byte
-	receivedIfaceMac []byte
-	sourceIface      string
-}
--- a/README.md
+++ b/README.md
@ -1,14 +1,66 @@
-# PNDPD - NDP Responder
-## Features
- Efficiently process incoming packets using bpf (which runs in the kernel)
- Respond to all NDP solicitations on an interface
- Respond to NDP solicitations for whitelisted addresses on an interface
- Proxy NDP between interfaces
- Permissions required: root or CAP_NET_RAW
+# PNDPD - NDP Responder + Proxy

-## Usage
+[![Build Status](https://ci.burble.dn42/api/badges/mirrors/Pndpd/status.svg?ref=refs/heads/burble.dn42)](https://ci.burble.dn42/mirrors/Pndpd)
+
+## Features
+- **Efficiently** process incoming packets using bpf (which runs in the kernel)
+- Respond to all NDP solicitations on an interface
+- **Respond** to NDP solicitations for whitelisted addresses on an interface
+- **Proxy** NDP between interfaces with an optional whitelist
+- Optionally determine whitelist **automatically** based on the IPs assigned to the interfaces 
+- Permissions required: root or CAP_NET_RAW
+- Easily expandable with modules
+
+## Installing & Updating
+
+1) Download the latest release from the [releases page](https://github.com/Kioubit/pndpd/releases) and move the binary to the ``/usr/local/bin/`` directory under the filename ``pndpd``.
+2) Allow executing the file by running ``chmod +x /usr/local/bin/pndpd``
+3) **For systemd users:** Install the service unit file
 ```` 
-pndpd readconfig <path to file>
-pndpd respond <interface> <optional whitelist of CIDRs separated with a semicolon>
-pndpd proxy <interface1> <interface2>
+wget https://raw.githubusercontent.com/Kioubit/pndpd/master/pndpd.service -P /etc/systemd/system/
+systemctl enable pndpd.service
 ```` 
+4) Download and install the config file
+```` 
+mkdir -p /etc/pndpd
+wget https://raw.githubusercontent.com/Kioubit/pndpd/master/pndpd.conf -P /etc/pndpd/
+````
+5) Edit the config at ``/etc/pndpd/pndpd.conf`` and then start the service using ``service pndpd start``
+
+## Manual Usage
+```` 
+pndpd config <path to file>
+pndpd responder <interface> <optional whitelist of CIDRs separated by a semicolon>
+pndpd proxy <interface1> <interface2> <optional whitelist of CIDRs separated by a semicolon applied to interface2>
+````
+More options and additional documentation in the example config file (``pndpd.conf``).
+
+## Developing
+
+### Building
+For building, the version of go needs to be installed that is specified in the go.mod file. A makefile is available. Optionally adjust the ``MODULES`` variable to include or exclude modules from the modules directory.
+````
+make clean
+make release-all
+```` 
+Find the binaries in the ``bin/`` directory
+
+### Adding Modules 
+It is easy to add functionality to PNDPD. For additions outside the core functionality you only need to keep the following methods in mind:
+```` 
+package main
+import "pndpd/pndp"
+
+pndp.ParseFilter(f string) []*net.IPNet
+
+responderInstance := pndp.NewResponder(iface string, filter []*net.IPNet, autosenseInterface string)
+responderInstance.Start()
+responderInstance.Stop()
+
+proxyInstance := pndp.NewProxy(iface1 string, iface2 string, filter []*net.IPNet, autosenseInterface string)
+proxyInstance.Start()
+proxyInstance.Stop()
+````
+New functionality should be implemented as a module. You will find an example module under ``modules/example/``. 
+
+Pull requests are welcome for any functionality you add.
--- a/config.go
+++ b/config.go
@ -2,80 +2,72 @@ package main

 import (
 	"bufio"
-	"log"
+	"fmt"
 	"os"
+	"pndpd/modules"
+	"pndpd/pndp"
 	"strings"
 )

-type configResponder struct {
-	Iface  string
-	Filter string
-}
-
-type configProxy struct {
-	Iface1 string
-	Iface2 string
-}
-
 func readConfig(dest string) {
 	file, err := os.Open(dest)
 	if err != nil {
-		log.Fatal(err)
+		fmt.Println("Error:", err.Error())
+		os.Exit(1)
 	}
-	defer file.Close()
+	defer func(file *os.File) {
+		_ = file.Close()
+	}(file)

 	scanner := bufio.NewScanner(file)

 	for scanner.Scan() {
 		line := scanner.Text()
-		if strings.HasPrefix(line, "//") {
+		if strings.HasPrefix(line, "//") || strings.TrimSpace(line) == "" {
 			continue
 		}
 		if strings.HasPrefix(line, "debug") {
-			if strings.Contains(line, "off") {
-				GlobalDebug = false
+			if strings.Contains(line, "on") {
+				pndp.GlobalDebug = true
+				fmt.Println("DEBUG ON")
 			}
 			continue
 		}
-		if strings.HasPrefix(line, "responder") {
-			obj := configResponder{}
-			filter := ""
-			for {
-				scanner.Scan()
-				line = scanner.Text()
-				if strings.HasPrefix(line, "iface") {
-					obj.Iface = strings.TrimSpace(strings.TrimPrefix(line, "iface"))
-				}
-				if strings.HasPrefix(line, "filter") {
-					filter += strings.TrimSpace(strings.TrimPrefix(line, "filter")) + ";"
-				}
-				if strings.HasPrefix(line, "}") {
-					obj.Filter = filter
-					break
+
+		if strings.HasSuffix(line, "{") {
+			option := strings.TrimSuffix(strings.TrimSpace(line), "{")
+			option = strings.TrimSpace(option)
+			module, command := modules.GetCommand(option, modules.Config)
+			var lines = make([]string, 0)
+			if module != nil {
+				for {
+					if !scanner.Scan() {
+						break
+					}
+					line := strings.TrimSpace(scanner.Text())
+					if strings.Contains(line, "}") {
+						break
+					}
+
+					lines = append(lines, line)
 				}
+				modules.ExecuteInit(module, modules.CallbackInfo{
+					CallbackType: modules.Config,
+					Command:      command,
+					Arguments:    lines,
+				})
 			}
-			go simpleRespond(obj.Iface, parseFilter(obj.Filter))
-		}
-		if strings.HasPrefix(line, "proxy") {
-			obj := configProxy{}
-			for {
-				scanner.Scan()
-				line = scanner.Text()
-				if strings.HasPrefix(line, "iface1") {
-					obj.Iface1 = strings.TrimSpace(strings.TrimPrefix(line, "iface1"))
-				}
-				if strings.HasPrefix(line, "iface2") {
-					obj.Iface2 = strings.TrimSpace(strings.TrimPrefix(line, "iface2"))
-				}
-				if strings.HasPrefix(line, "}") {
-					break
-				}
-			}
-			go proxy(obj.Iface1, obj.Iface2)
 		}
+
+	}
+	if modules.ExistsBlockingModule() {
+		modules.ExecuteComplete()
+		waitForSignal()
+		modules.ShutdownAll()
 	}

 	if err := scanner.Err(); err != nil {
-		log.Fatal(err)
+		panic(err)
 	}
+
 }
--- a/main.go
+++ b/main.go
@ -3,10 +3,20 @@ package main
 import (
 	"fmt"
 	"os"
+	"os/signal"
+	"pndpd/modules"
+	"syscall"
+)
+import (
+	// Modules
+	_ "pndpd/modules/example"
+	_ "pndpd/modules/userInterface"
 )

+var Version = "Development"
+
 func main() {
-	fmt.Println("PNDPD Version 0.4 by Kioubit")
+	fmt.Println("PNDPD Version", Version, "- Kioubit 2022")

 	if len(os.Args) <= 2 {
 		printUsage()
@ -14,26 +24,45 @@ func main() {
 	}

 	switch os.Args[1] {
-	case "respond":
-		if len(os.Args) == 4 {
-			go simpleRespond(os.Args[2], parseFilter(os.Args[3]))
-		} else {
-			go simpleRespond(os.Args[2], nil)
-		}
-	case "proxy":
-		go proxy(os.Args[2], os.Args[3])
-	case "readconfig":
+	case "config":
 		readConfig(os.Args[2])
 	default:
-		printUsage()
-		return
+		module, command := modules.GetCommand(os.Args[1], modules.CommandLine)
+		if module != nil {
+			modules.ExecuteInit(module, modules.CallbackInfo{
+				CallbackType: modules.CommandLine,
+				Command:      command,
+				Arguments:    os.Args[2:],
+			})
+			if modules.ExistsBlockingModule() {
+				modules.ExecuteComplete()
+				waitForSignal()
+				modules.ShutdownAll()
+			}
+		} else {
+			printUsage()
+		}
 	}
-	waitForSignal()
+
 }

 func printUsage() {
-	fmt.Println("Specify command")
-	fmt.Println("Usage: pndpd readconfig <path to file>")
-	fmt.Println("Usage: pndpd respond <interface> <optional whitelist of CIDRs separated with a semicolon>")
-	fmt.Println("Usage: pndpd proxy <interface1> <interface2>")
+	fmt.Println("More options and additional documentation in the example config file")
+	fmt.Println("Usage:")
+	fmt.Println("pndpd config <path to file>")
+	for i := range modules.ModuleList {
+		for d := range (*modules.ModuleList[i]).Commands {
+			if (*modules.ModuleList[i]).Commands[d].CommandLineEnabled {
+				fmt.Println((*modules.ModuleList[i]).Commands[d].Description)
+			}
+		}
+	}
+}
+
+// waitForSignal Waits (blocking) for the program to be interrupted by the OS
+func waitForSignal() {
+	var sigCh = make(chan os.Signal, 1)
+	signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
+	<-sigCh
+	close(sigCh)
 }
--- a/modules/example/example.go
+++ b/modules/example/example.go
@ -0,0 +1,52 @@
+//go:build mod_example
+// +build mod_example
+
+package example
+
+import (
+	"fmt"
+	"pndpd/modules"
+)
+
+// This is an example module
+func init() {
+	commands := []modules.Command{{
+		CommandText:        "pndpd command1",
+		Description:        "This is the usage description for command1",
+		BlockTerminate:     true,
+		CommandLineEnabled: true,
+		ConfigEnabled:      true,
+	}, {
+		CommandText:        "pndpd command2",
+		Description:        "This is the usage description for command2",
+		BlockTerminate:     false,
+		CommandLineEnabled: false,
+		ConfigEnabled:      true,
+	},
+	}
+	modules.RegisterModule("Example", commands, initCallback, completeCallback, shutdownCallback)
+}
+
+func initCallback(callback modules.CallbackInfo) {
+	if callback.CallbackType == modules.CommandLine {
+		// The command registered by the module has been run in the commandline
+		// "arguments" contains the os.Args[] passed to the program after the command registered by this module
+		fmt.Println("Command: ", callback.Command.CommandText)
+		fmt.Println(callback.Arguments)
+
+	} else {
+		// The command registered by the module was found in the config file
+		// "arguments" contains the lines between the curly braces
+		fmt.Println("Command: ", callback.Command.CommandText)
+		fmt.Println(callback.Arguments)
+	}
+	fmt.Println()
+}
+
+func completeCallback() {
+	//Called after the program has passed all options by calls to initCallback()
+}
+
+func shutdownCallback() {
+	fmt.Println("Terminate all work")
+}
--- a/modules/example/module.go
+++ b/modules/example/module.go
@ -0,0 +1 @@
+package example
--- a/modules/modules.go
+++ b/modules/modules.go
@ -0,0 +1,93 @@
+package modules
+
+var ModuleList []*Module
+
+type Module struct {
+	Name             string
+	Commands         []Command
+	InitCallback     func(CallbackInfo)
+	CompleteCallback func()
+	ShutdownCallback func()
+}
+
+type Command struct {
+	CommandText        string
+	Description        string
+	BlockTerminate     bool
+	CommandLineEnabled bool
+	ConfigEnabled      bool
+}
+
+type CallbackType int
+
+const (
+	CommandLine CallbackType = 0
+	Config      CallbackType = 1
+)
+
+type CallbackInfo struct {
+	CallbackType CallbackType
+	Command      Command
+	Arguments    []string
+}
+
+func RegisterModule(name string, commands []Command, initCallback func(CallbackInfo), CompleteCallback func(), shutdownCallback func()) {
+	ModuleList = append(ModuleList, &Module{
+		Name:             name,
+		Commands:         commands,
+		InitCallback:     initCallback,
+		CompleteCallback: CompleteCallback,
+		ShutdownCallback: shutdownCallback,
+	})
+}
+
+func GetCommand(target string, scope CallbackType) (*Module, Command) {
+	for i := range ModuleList {
+		for _, command := range ModuleList[i].Commands {
+			if command.CommandText == target {
+				if scope == CommandLine && command.CommandLineEnabled {
+					return ModuleList[i], command
+				}
+				if scope == Config && command.ConfigEnabled {
+					return ModuleList[i], command
+				}
+				return nil, Command{}
+			}
+		}
+	}
+	return nil, Command{}
+}
+
+var runningModules []*Module
+
+func ExecuteInit(module *Module, info CallbackInfo) {
+	if info.Command.BlockTerminate {
+		found := false
+		for _, n := range runningModules {
+			if n == module {
+				found = true
+				break
+			}
+		}
+		if !found {
+			runningModules = append(runningModules, module)
+		}
+	}
+	module.InitCallback(info)
+}
+
+func ExecuteComplete() {
+	for i := range runningModules {
+		(*runningModules[i]).CompleteCallback()
+	}
+}
+
+func ShutdownAll() {
+	for i := range runningModules {
+		(*runningModules[i]).ShutdownCallback()
+	}
+}
+
+func ExistsBlockingModule() bool {
+	return len(runningModules) != 0
+}
--- a/modules/userInterface/module.go
+++ b/modules/userInterface/module.go
@ -0,0 +1 @@
+package userInterface
--- a/modules/userInterface/userInterface.go
+++ b/modules/userInterface/userInterface.go
@ -0,0 +1,195 @@
+//go:build !noUserInterface
+// +build !noUserInterface
+
+package userInterface
+
+import (
+	"fmt"
+	"os"
+	"pndpd/modules"
+	"pndpd/pndp"
+	"strings"
+)
+
+func init() {
+	commands := []modules.Command{{
+		CommandText:        "proxy",
+		Description:        "pndpd proxy <interface1> <interface2> <optional whitelist of CIDRs separated by a semicolon applied to interface2>",
+		BlockTerminate:     true,
+		ConfigEnabled:      true,
+		CommandLineEnabled: true,
+	}, {
+		CommandText:        "responder",
+		Description:        "pndpd responder <interface> <optional whitelist of CIDRs separated by a semicolon>",
+		BlockTerminate:     true,
+		ConfigEnabled:      true,
+		CommandLineEnabled: true,
+	}, {
+		CommandText:        "modules",
+		Description:        "pndpd modules available - list available modules",
+		BlockTerminate:     false,
+		ConfigEnabled:      false,
+		CommandLineEnabled: true,
+	}}
+	modules.RegisterModule("Core", commands, initCallback, completeCallback, shutdownCallback)
+}
+
+type configResponder struct {
+	Iface     string
+	Filter    string
+	autosense string
+	instance  *pndp.ResponderObj
+}
+
+type configProxy struct {
+	Iface1    string
+	Iface2    string
+	Filter    string
+	autosense string
+	instance  *pndp.ProxyObj
+}
+
+var allResponders []*configResponder
+var allProxies []*configProxy
+
+func initCallback(callback modules.CallbackInfo) {
+	if callback.CallbackType == modules.CommandLine {
+		switch callback.Command.CommandText {
+		case "proxy":
+			if len(callback.Arguments) == 3 {
+				allProxies = append(allProxies, &configProxy{
+					Iface1:    callback.Arguments[0],
+					Iface2:    callback.Arguments[1],
+					Filter:    callback.Arguments[2],
+					autosense: "",
+					instance:  nil,
+				})
+			} else {
+				allProxies = append(allProxies, &configProxy{
+					Iface1:    callback.Arguments[0],
+					Iface2:    callback.Arguments[1],
+					Filter:    "",
+					autosense: "",
+					instance:  nil,
+				})
+			}
+		case "responder":
+			if len(callback.Arguments) == 2 {
+				allResponders = append(allResponders, &configResponder{
+					Iface:     callback.Arguments[0],
+					Filter:    callback.Arguments[1],
+					autosense: "",
+					instance:  nil,
+				})
+			} else {
+				allResponders = append(allResponders, &configResponder{
+					Iface:     callback.Arguments[0],
+					Filter:    "",
+					autosense: "",
+					instance:  nil,
+				})
+			}
+		case "modules":
+			if modules.ModuleList != nil {
+				fmt.Print("Available Modules: ")
+				for i := range modules.ModuleList {
+					fmt.Print((*modules.ModuleList[i]).Name + " ")
+				}
+				fmt.Println()
+			}
+
+		}
+
+	} else {
+		switch callback.Command.CommandText {
+		case "proxy":
+			obj := configProxy{}
+			filter := ""
+			for _, n := range callback.Arguments {
+				if strings.HasPrefix(n, "iface1") {
+					obj.Iface1 = strings.TrimSpace(strings.TrimPrefix(n, "iface1"))
+				}
+				if strings.HasPrefix(n, "iface2") {
+					obj.Iface2 = strings.TrimSpace(strings.TrimPrefix(n, "iface2"))
+				}
+				if strings.HasPrefix(n, "filter") {
+					filter += strings.TrimSpace(strings.TrimPrefix(n, "filter")) + ";"
+					if strings.Contains(n, ";") {
+						showError("config: the use of semicolons is not allowed in the filter arguments")
+					}
+				}
+				if strings.HasPrefix(n, "autosense") {
+					obj.autosense = strings.TrimSpace(strings.TrimPrefix(n, "autosense"))
+				}
+				if strings.Contains(n, "//") {
+					showError("config: comments are not allowed after arguments")
+				}
+			}
+			obj.Filter = strings.TrimSuffix(filter, ";")
+			if obj.autosense != "" && obj.Filter != "" {
+				showError("config: cannot have both a filter and autosense enabled on a proxy object")
+			}
+			if obj.Iface2 == "" || obj.Iface1 == "" {
+				showError("config: two interfaces need to be specified in the config file for a proxy object. (iface1 and iface2 parameters)")
+			}
+			allProxies = append(allProxies, &obj)
+		case "responder":
+			obj := configResponder{}
+			filter := ""
+			for _, n := range callback.Arguments {
+				if strings.HasPrefix(n, "iface") {
+					obj.Iface = strings.TrimSpace(strings.TrimPrefix(n, "iface"))
+				}
+				if strings.HasPrefix(n, "filter") {
+					filter += strings.TrimSpace(strings.TrimPrefix(n, "filter")) + ";"
+					if strings.Contains(n, ";") {
+						showError("config: the use of semicolons is not allowed in the filter arguments")
+					}
+				}
+				if strings.HasPrefix(n, "autosense") {
+					obj.autosense = strings.TrimSpace(strings.TrimPrefix(n, "autosense"))
+				}
+				if obj.autosense != "" && obj.Filter != "" {
+					showError("config: cannot have both a filter and autosense enabled on a responder object")
+				}
+				if obj.Iface == "" {
+					showError("config: interface not specified in the responder object. (iface parameter)")
+				}
+				if strings.Contains(n, "//") {
+					showError("config: comments are not allowed after arguments")
+				}
+			}
+			obj.Filter = strings.TrimSuffix(filter, ";")
+			allResponders = append(allResponders, &obj)
+
+		}
+	}
+}
+
+func completeCallback() {
+	for _, n := range allProxies {
+		o := pndp.NewProxy(n.Iface1, n.Iface2, pndp.ParseFilter(n.Filter), n.autosense)
+		n.instance = o
+		o.Start()
+	}
+	for _, n := range allResponders {
+		o := pndp.NewResponder(n.Iface, pndp.ParseFilter(n.Filter), n.autosense)
+		n.instance = o
+		o.Start()
+	}
+}
+func shutdownCallback() {
+	for _, n := range allProxies {
+		n.instance.Stop()
+	}
+
+	for _, n := range allResponders {
+		n.instance.Stop()
+	}
+}
+
+func showError(error string) {
+	fmt.Println(error)
+	fmt.Println("Exiting due to error")
+	os.Exit(1)
+}
--- a/pndp/NDPRequest.go
+++ b/pndp/NDPRequest.go
@ -0,0 +1,22 @@
+package pndp
+
+type ndpType int
+
+const (
+	ndp_ADV ndpType = 0
+	ndp_SOL ndpType = 1
+)
+
+type ndpRequest struct {
+	requestType    ndpType
+	srcIP          []byte
+	answeringForIP []byte
+	dstIP          []byte
+	sourceIface    string
+	payload        []byte
+}
+
+type ndpQuestion struct {
+	targetIP []byte
+	askedBy  []byte
+}
--- a/pndp/flow.go
+++ b/pndp/flow.go
@ -0,0 +1,182 @@
+package pndp
+
+import (
+	"fmt"
+	"net"
+	"strings"
+	"sync"
+	"time"
+)
+
+var GlobalDebug = false
+
+type ResponderObj struct {
+	stopChan  chan struct{}
+	stopWG    *sync.WaitGroup
+	iface     string
+	filter    []*net.IPNet
+	autosense string
+}
+type ProxyObj struct {
+	stopChan  chan struct{}
+	stopWG    *sync.WaitGroup
+	iface1    string
+	iface2    string
+	filter    []*net.IPNet
+	autosense string
+}
+
+// NewResponder
+//
+// iface - The interface to listen to and respond from
+//
+// filter - Optional (can be nil) list of CIDRs to whitelist. Must be IPV6! ParseFilter verifies ipv6
+//
+// With the optional autosenseInterface argument, the whitelist is configured based on the addresses assigned to the interface specified. This works even if the IP addresses change frequently.
+// Start() must be called on the object to actually start responding
+func NewResponder(iface string, filter []*net.IPNet, autosenseInterface string) *ResponderObj {
+	if filter == nil && autosenseInterface == "" {
+		fmt.Println("WARNING: You should use a whitelist for the responder unless you really know what you are doing")
+	}
+	var s sync.WaitGroup
+	return &ResponderObj{
+		stopChan:  make(chan struct{}),
+		stopWG:    &s,
+		iface:     iface,
+		filter:    filter,
+		autosense: autosenseInterface,
+	}
+}
+func (obj *ResponderObj) Start() {
+	go obj.start()
+}
+func (obj *ResponderObj) start() {
+	obj.stopWG.Add(1)
+	requests := make(chan *ndpRequest, 100)
+	defer func() {
+		close(requests)
+		obj.stopWG.Done()
+	}()
+	go respond(obj.iface, requests, ndp_ADV, nil, obj.filter, obj.autosense, obj.stopWG, obj.stopChan)
+	go listen(obj.iface, requests, ndp_SOL, obj.stopWG, obj.stopChan)
+	fmt.Printf("Started responder instance on interface %s", obj.iface)
+	fmt.Println()
+	<-obj.stopChan
+}
+
+//Stop a running Responder instance
+// Returns false on error
+func (obj *ResponderObj) Stop() bool {
+	close(obj.stopChan)
+	fmt.Println("Shutting down responder instance..")
+	if wgWaitTimout(obj.stopWG, 10*time.Second) {
+		fmt.Println("Done")
+		return true
+	} else {
+		fmt.Println("Error shutting down instance")
+		return false
+	}
+}
+
+// NewProxy Proxy NDP between interfaces iface1 and iface2 with an optional filter (whitelist)
+//
+// filter - Optional (can be nil) list of CIDRs to whitelist. Must be IPV6! ParseFilter verifies ipv6
+//
+// With the optional autosenseInterface argument, the whitelist is configured based on the addresses assigned to the interface specified. This works even if the IP addresses change frequently.
+//
+// Start() must be called on the object to actually start proxying
+func NewProxy(iface1 string, iface2 string, filter []*net.IPNet, autosenseInterface string) *ProxyObj {
+	var s sync.WaitGroup
+	return &ProxyObj{
+		stopChan:  make(chan struct{}),
+		stopWG:    &s,
+		iface1:    iface1,
+		iface2:    iface2,
+		filter:    filter,
+		autosense: autosenseInterface,
+	}
+}
+
+func (obj *ProxyObj) Start() {
+	go obj.start()
+}
+func (obj *ProxyObj) start() {
+	obj.stopWG.Add(1)
+	defer func() {
+		obj.stopWG.Done()
+	}()
+
+	out_iface1_sol_questions_iface2_adv := make(chan *ndpQuestion, 100)
+	defer close(out_iface1_sol_questions_iface2_adv)
+	out_iface2_sol_questions_iface1_adv := make(chan *ndpQuestion, 100)
+	defer close(out_iface2_sol_questions_iface1_adv)
+
+	req_iface1_sol_iface2 := make(chan *ndpRequest, 100)
+	defer close(req_iface1_sol_iface2)
+	go listen(obj.iface1, req_iface1_sol_iface2, ndp_SOL, obj.stopWG, obj.stopChan)
+	go respond(obj.iface2, req_iface1_sol_iface2, ndp_SOL, out_iface2_sol_questions_iface1_adv, obj.filter, obj.autosense, obj.stopWG, obj.stopChan)
+
+	req_iface2_sol_iface1 := make(chan *ndpRequest, 100)
+	defer close(req_iface2_sol_iface1)
+	go listen(obj.iface2, req_iface2_sol_iface1, ndp_SOL, obj.stopWG, obj.stopChan)
+	go respond(obj.iface1, req_iface2_sol_iface1, ndp_SOL, out_iface1_sol_questions_iface2_adv, nil, "", obj.stopWG, obj.stopChan)
+
+	req_iface1_adv_iface2 := make(chan *ndpRequest, 100)
+	defer close(req_iface1_adv_iface2)
+	go listen(obj.iface1, req_iface1_adv_iface2, ndp_ADV, obj.stopWG, obj.stopChan)
+	go respond(obj.iface2, req_iface1_adv_iface2, ndp_ADV, out_iface1_sol_questions_iface2_adv, nil, "", obj.stopWG, obj.stopChan)
+
+	req_iface2_adv_iface1 := make(chan *ndpRequest, 100)
+	defer close(req_iface2_adv_iface1)
+	go listen(obj.iface2, req_iface2_adv_iface1, ndp_ADV, obj.stopWG, obj.stopChan)
+	go respond(obj.iface1, req_iface2_adv_iface1, ndp_ADV, out_iface2_sol_questions_iface1_adv, nil, "", obj.stopWG, obj.stopChan)
+
+	fmt.Printf("Started Proxy instance on interfaces %s and %s (if enabled, the whitelist is applied on %s)", obj.iface1, obj.iface2, obj.iface2)
+	fmt.Println()
+	<-obj.stopChan
+}
+
+//Stop a running Proxy instance
+// Returns false on error
+func (obj *ProxyObj) Stop() bool {
+	close(obj.stopChan)
+	fmt.Println("Shutting down proxy instance..")
+	if wgWaitTimout(obj.stopWG, 10*time.Second) {
+		fmt.Println("Done")
+		return true
+	} else {
+		fmt.Println("Error shutting down instance")
+		return false
+	}
+}
+
+// ParseFilter Helper Function to Parse a string of CIDRs separated by a semicolon as a Whitelist
+func ParseFilter(f string) []*net.IPNet {
+	if f == "" {
+		return nil
+	}
+	s := strings.Split(f, ";")
+	result := make([]*net.IPNet, len(s))
+	for i, n := range s {
+		_, cidr, err := net.ParseCIDR(n)
+		if err != nil {
+			panic(err)
+		}
+		result[i] = cidr
+	}
+	return result
+}
+
+func wgWaitTimout(wg *sync.WaitGroup, timeout time.Duration) bool {
+	t := make(chan struct{})
+	go func() {
+		defer close(t)
+		wg.Wait()
+	}()
+	select {
+	case <-t:
+		return true
+	case <-time.After(timeout):
+		return false
+	}
+}
--- a/pndp/interface.go
+++ b/pndp/interface.go
@ -0,0 +1,96 @@
+package pndp
+
+import (
+	"golang.org/x/net/bpf"
+	"golang.org/x/sys/unix"
+	"net"
+	"syscall"
+	"unsafe"
+)
+
+// bpfFilter represents a classic BPF filter program that can be applied to a socket
+type bpfFilter []bpf.Instruction
+
+// ApplyTo applies the current filter onto the provided file descriptor
+func (filter bpfFilter) ApplyTo(fd int) (err error) {
+	var assembled []bpf.RawInstruction
+	if assembled, err = bpf.Assemble(filter); err != nil {
+		return err
+	}
+
+	var program = unix.SockFprog{
+		Len:    uint16(len(assembled)),
+		Filter: (*unix.SockFilter)(unsafe.Pointer(&assembled[0])),
+	}
+	var b = (*[unix.SizeofSockFprog]byte)(unsafe.Pointer(&program))[:unix.SizeofSockFprog]
+
+	if _, _, errno := syscall.Syscall6(syscall.SYS_SETSOCKOPT,
+		uintptr(fd), uintptr(syscall.SOL_SOCKET), uintptr(syscall.SO_ATTACH_FILTER),
+		uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0); errno != 0 {
+		return errno
+	}
+
+	return nil
+}
+
+type iflags struct {
+	name  [syscall.IFNAMSIZ]byte
+	flags uint16
+}
+
+func setPromisc(fd int, iface string, enable bool, withInterfaceFlags bool) {
+	//TODO re-test ALLMULTI
+
+	// -------------------------- Interface flags --------------------------
+	if withInterfaceFlags {
+		tFD, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_DGRAM, 0)
+		if err != nil {
+			panic(err)
+		}
+
+		var ifl iflags
+		copy(ifl.name[:], []byte(iface))
+		_, _, ep := syscall.Syscall(syscall.SYS_IOCTL, uintptr(tFD), syscall.SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
+		if ep != 0 {
+			panic(ep)
+		}
+
+		if enable {
+			ifl.flags |= uint16(syscall.IFF_PROMISC)
+		} else {
+			ifl.flags &^= uint16(syscall.IFF_PROMISC)
+		}
+
+		_, _, ep = syscall.Syscall(syscall.SYS_IOCTL, uintptr(tFD), syscall.SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
+		if ep != 0 {
+			panic(ep)
+		}
+
+		_ = syscall.Close(tFD)
+	}
+	// ---------------------------------------------------------------------
+
+	// -------------------------- Socket Options ---------------------------
+	iFace, err := net.InterfaceByName(iface)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	mReq := unix.PacketMreq{
+		Ifindex: int32(iFace.Index),
+		Type:    unix.PACKET_MR_PROMISC,
+	}
+
+	var opt int
+	if enable {
+		opt = unix.PACKET_ADD_MEMBERSHIP
+	} else {
+		opt = unix.PACKET_DROP_MEMBERSHIP
+	}
+
+	err = unix.SetsockoptPacketMreq(fd, unix.SOL_PACKET, opt, &mReq)
+	if err != nil {
+		panic(err)
+	}
+	// ---------------------------------------------------------------------
+}
--- a/pndp/listener.go
+++ b/pndp/listener.go
@ -0,0 +1,146 @@
+package pndp
+
+import (
+	"bytes"
+	"fmt"
+	"golang.org/x/net/bpf"
+	"net"
+	"sync"
+	"syscall"
+)
+
+// Htons Convert a uint16 to host byte order (big endian)
+func htons(v uint16) int {
+	return int((v << 8) | (v >> 8))
+}
+func htons16(v uint16) uint16 { return v<<8 | v>>8 }
+
+func listen(iface string, responder chan *ndpRequest, requestType ndpType, stopWG *sync.WaitGroup, stopChan chan struct{}) {
+	stopWG.Add(1)
+	defer stopWG.Done()
+
+	niface, err := net.InterfaceByName(iface)
+	if err != nil {
+		panic(err.Error())
+	}
+	tiface := &syscall.SockaddrLinklayer{
+		Protocol: htons16(syscall.ETH_P_IPV6),
+		Ifindex:  niface.Index,
+	}
+
+	fd, err := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_RAW, htons(syscall.ETH_P_IPV6))
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+	go func() {
+		<-stopChan
+		setPromisc(fd, iface, false, false)
+		_ = syscall.Close(fd)
+		stopWG.Done() // syscall.read does not release when the file descriptor is closed
+	}()
+	if GlobalDebug {
+		fmt.Println("Obtained fd ", fd)
+	}
+
+	if len([]byte(iface)) > syscall.IFNAMSIZ {
+		panic("Interface size larger then maximum allowed by the kernel")
+	}
+
+	err = syscall.Bind(fd, tiface)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	setPromisc(fd, iface, true, false)
+
+	var protocolNo uint32
+	if requestType == ndp_SOL {
+		//Neighbor Solicitation
+		protocolNo = 0x87
+	} else {
+		//Neighbor Advertisement
+		protocolNo = 0x88
+	}
+	var f bpfFilter
+	f = []bpf.Instruction{
+		// Load "EtherType" field from the ethernet header.
+		bpf.LoadAbsolute{Off: 12, Size: 2},
+		// Jump to the drop packet instruction if EtherType is not IPv6.
+		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x86dd, SkipTrue: 5},
+		// Load "Next Header" field from IPV6 header.
+		bpf.LoadAbsolute{Off: 20, Size: 1},
+		// Jump to the drop packet instruction if Next Header is not ICMPv6.
+		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x3a, SkipTrue: 3},
+		// Load "Type" field from ICMPv6 header.
+		bpf.LoadAbsolute{Off: 54, Size: 1},
+		// Jump to the drop packet instruction if Type is not Neighbor Solicitation / Advertisement.
+		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: protocolNo, SkipTrue: 1},
+		// Verdict is: send up to 86 bytes of the packet to userspace.
+		bpf.RetConstant{Val: 86},
+		// Verdict is: "ignore packet."
+		bpf.RetConstant{Val: 0},
+	}
+
+	err = f.ApplyTo(fd)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	for {
+		buf := make([]byte, 86)
+		numRead, err := syscall.Read(fd, buf)
+		if err != nil {
+			panic(err)
+		}
+		if numRead < 78 {
+			if GlobalDebug {
+				fmt.Println("Dropping packet since it does not meet the minimum length requirement")
+				fmt.Printf("% X\n", buf[:numRead])
+			}
+			continue
+		}
+		if GlobalDebug {
+			fmt.Println("Got packet on", iface, "of type", requestType)
+			fmt.Printf("% X\n", buf[:numRead])
+
+			fmt.Println("Source mac on ethernet layer:")
+			fmt.Printf("% X\n", buf[6:12])
+			fmt.Println("Source IP:")
+			fmt.Printf("% X\n", buf[22:38])
+			fmt.Println("Destination IP:")
+			fmt.Printf("% X\n", buf[38:54])
+			fmt.Println("Requested IP:")
+			fmt.Printf("% X\n", buf[62:78])
+			if requestType == ndp_ADV {
+				fmt.Println("NDP Flags")
+				fmt.Printf("% X\n", buf[58])
+			}
+			fmt.Println()
+		}
+
+		if bytes.Equal(buf[6:12], niface.HardwareAddr) {
+			if GlobalDebug {
+				fmt.Println("Dropping packet from ourselves")
+			}
+			continue
+		}
+
+		if requestType == ndp_ADV {
+			if buf[58] == 0x0 {
+				if GlobalDebug {
+					fmt.Println("Dropping Advertisement packet without any NDP flags set")
+				}
+				continue
+			}
+		}
+
+		responder <- &ndpRequest{
+			requestType:    requestType,
+			srcIP:          buf[22:38],
+			dstIP:          buf[38:54],
+			answeringForIP: buf[62:78],
+			payload:        buf[54:],
+			sourceIface:    iface,
+		}
+	}
+}
--- a/pndp/packet.go
+++ b/pndp/packet.go
@ -1,19 +1,21 @@
-package main
+package pndp

 import (
+	"bytes"
 	"encoding/binary"
 	"errors"
+	"fmt"
 	"net"
 	"strings"
 )

 var emptyIpv6 = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}

-type Payload interface {
+type payload interface {
 	constructPacket() ([]byte, int)
 }

-type IPv6Header struct {
+type ipv6Header struct {
 	protocol   byte
 	srcIP      []byte
 	dstIP      []byte
@ -21,14 +23,14 @@ type IPv6Header struct {
 	payload    []byte
 }

-func newIpv6Header(srcIp []byte, dstIp []byte) (*IPv6Header, error) {
+func newIpv6Header(srcIp []byte, dstIp []byte) (*ipv6Header, error) {
 	if len(dstIp) != 16 || len(srcIp) != 16 {
 		return nil, errors.New("malformed IP")
 	}
-	return &IPv6Header{dstIP: dstIp, srcIP: srcIp, protocol: 0x3a}, nil
+	return &ipv6Header{dstIP: dstIp, srcIP: srcIp, protocol: 0x3a}, nil
 }

-func (h *IPv6Header) addPayload(payload Payload) {
+func (h *ipv6Header) addPayload(payload payload) {
 	bPayload, checksumPos := payload.constructPacket()
 	bPayloadLen := make([]byte, 2)
 	binary.BigEndian.PutUint16(bPayloadLen, uint16(len(bPayload)))
@ -44,14 +46,14 @@ func (h *IPv6Header) addPayload(payload Payload) {
 	h.payload = bPayload
 }

-func (h *IPv6Header) constructPacket() []byte {
+func (h *ipv6Header) constructPacket() []byte {
 	header := []byte{
 		0x60,            // v6
 		0,               // qos
 		0,               // qos
 		0,               // qos
-		h.payloadLen[0], // Payload Length
-		h.payloadLen[1], // Payload Length
+		h.payloadLen[0], // payload Length
+		h.payloadLen[1], // payload Length
 		h.protocol,      // Protocol next header
 		0xff,            // Hop limit
 	}
@ -61,28 +63,28 @@ func (h *IPv6Header) constructPacket() []byte {
 	return final
 }

-type NdpPayload struct {
-	packetType     NDPType
+type ndpPayload struct {
+	packetType     ndpType
 	answeringForIP []byte
 	mac            []byte
 }

-func newNdpPacket(answeringForIP []byte, mac []byte, packetType NDPType) (*NdpPayload, error) {
+func newNdpPacket(answeringForIP []byte, mac []byte, packetType ndpType) (*ndpPayload, error) {
 	if len(answeringForIP) != 16 || len(mac) != 6 {
 		return nil, errors.New("malformed IP")
 	}
-	return &NdpPayload{
+	return &ndpPayload{
 		packetType:     packetType,
 		answeringForIP: answeringForIP,
 		mac:            mac,
 	}, nil
 }

-func (p *NdpPayload) constructPacket() ([]byte, int) {
+func (p *ndpPayload) constructPacket() ([]byte, int) {
 	var protocol byte
 	var flags byte
 	var linkType byte
-	if p.packetType == NDP_SOL {
+	if p.packetType == ndp_SOL {
 		protocol = 0x87
 		flags = 0x0
 		linkType = 0x01
@ -92,7 +94,7 @@ func (p *NdpPayload) constructPacket() ([]byte, int) {
 		linkType = 0x02
 	}
 	header := []byte{
-		protocol, // Type: NDPType
+		protocol, // Type: ndpType
 		0x0,      // Code
 		0x0,      // Checksum filled in later
 		0x0,      // Checksum filled in later
@ -113,7 +115,12 @@ func (p *NdpPayload) constructPacket() ([]byte, int) {
 	return final, 2
 }

-func calculateChecksum(h *IPv6Header, payload []byte) uint16 {
+func calculateChecksum(h *ipv6Header, payload []byte) uint16 {
+	if payload == nil {
+		return 0x0000
+	} else if len(payload) == 0 {
+		return 0x0000
+	}
 	sumPseudoHeader := checksumAddition(h.srcIP) + checksumAddition(h.dstIP) + checksumAddition([]byte{0x00, h.protocol}) + checksumAddition(h.payloadLen)
 	sumPayload := checksumAddition(payload)
 	sumTotal := sumPayload + sumPseudoHeader
@ -127,13 +134,40 @@ func checksumAddition(b []byte) uint32 {
 	var sum uint32 = 0
 	for i := 0; i < len(b); i++ {
 		if i%2 == 0 {
-			sum += uint32(uint16(b[i])<<8 | uint16(b[i+1]))
+			if len(b)-1 == i {
+				sum += uint32(uint16(b[i])<<8 | uint16(0x00))
+			} else {
+				sum += uint32(uint16(b[i])<<8 | uint16(b[i+1]))
+			}
 		}
 	}
 	return sum
 }

-func IsIPv6(ip string) bool {
+func checkPacketChecksum(v6 *ipv6Header, payload []byte) bool {
+	packetsum := make([]byte, 2)
+	copy(packetsum, payload[2:4])
+
+	bPayloadLen := make([]byte, 2)
+	binary.BigEndian.PutUint16(bPayloadLen, uint16(len(payload)))
+	v6.payloadLen = bPayloadLen
+
+	payload[2] = 0x0
+	payload[3] = 0x0
+
+	bChecksum := make([]byte, 2)
+	binary.BigEndian.PutUint16(bChecksum, calculateChecksum(v6, payload))
+	if bytes.Equal(packetsum, bChecksum) {
+		return true
+	} else {
+		if GlobalDebug {
+			fmt.Println("Received packet checksum validation failed")
+		}
+		return false
+	}
+}
+
+func isIpv6(ip string) bool {
 	rip := net.ParseIP(ip)
 	return rip != nil && strings.Contains(ip, ":")
 }
--- a/pndp/responder.go
+++ b/pndp/responder.go
@ -0,0 +1,240 @@
+package pndp
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+	"sync"
+	"syscall"
+)
+
+func respond(iface string, requests chan *ndpRequest, respondType ndpType, ndpQuestionChan chan *ndpQuestion, filter []*net.IPNet, autoSense string, stopWG *sync.WaitGroup, stopChan chan struct{}) {
+	stopWG.Add(1)
+	defer stopWG.Done()
+
+	var ndpQuestionsList = make([]*ndpQuestion, 0, 40)
+	var _, linkLocalSpace, _ = net.ParseCIDR("fe80::/10")
+
+	fd, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_RAW, syscall.IPPROTO_RAW)
+	if err != nil {
+		panic(err)
+	}
+	defer func(fd int) {
+		_ = syscall.Close(fd)
+	}(fd)
+	err = syscall.BindToDevice(fd, iface)
+	if err != nil {
+		panic(err)
+	}
+
+	respondIface, err := net.InterfaceByName(iface)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	var result = selectSourceIP(respondIface)
+
+	for {
+		var req *ndpRequest
+		if (ndpQuestionChan == nil && respondType == ndp_ADV) || (ndpQuestionChan != nil && respondType == ndp_SOL) {
+			select {
+			case <-stopChan:
+				return
+			case req = <-requests:
+			}
+		} else {
+			// This is if ndpQuestionChan != nil && respondType == ndp_ADV
+			select {
+			case <-stopChan:
+				return
+			case q := <-ndpQuestionChan:
+				ndpQuestionsList = append(ndpQuestionsList, q)
+				ndpQuestionsList = cleanupQuestionList(ndpQuestionsList)
+				continue
+			case req = <-requests:
+			}
+		}
+
+		if linkLocalSpace.Contains(req.answeringForIP) {
+			if GlobalDebug {
+				fmt.Println("Dropping packet asking for a link-local IP")
+			}
+			continue
+		}
+
+		v6Header, err := newIpv6Header(req.srcIP, req.dstIP)
+		if err != nil {
+			continue
+		}
+		if !checkPacketChecksum(v6Header, req.payload) {
+			continue
+		}
+
+		// Auto-sense
+		if autoSense != "" {
+			//TODO Future work: Use another sub goroutine to monitor the interface instead of checking here
+			filter = make([]*net.IPNet, 0)
+			result = selectSourceIP(respondIface)
+			autoiface, err := net.InterfaceByName(autoSense)
+			if err != nil {
+				panic(err)
+			}
+			autoifaceaddrs, err := autoiface.Addrs()
+
+			for _, l := range autoifaceaddrs {
+				testIP, anet, err := net.ParseCIDR(l.String())
+				if err != nil {
+					break
+				}
+				if isIpv6(testIP.String()) {
+					filter = append(filter, anet)
+				}
+			}
+		}
+
+		if filter != nil {
+			ok := false
+			for _, i := range filter {
+				if i.Contains(req.answeringForIP) {
+					if GlobalDebug {
+						fmt.Println("Responded for whitelisted IP", req.answeringForIP)
+					}
+					ok = true
+					break
+				}
+			}
+			if !ok {
+				continue
+			}
+		}
+
+		if GlobalDebug {
+			fmt.Println("Getting ready to send packet of type", respondType, "out on interface", iface)
+		}
+
+		if req.sourceIface == iface {
+			pkt(fd, result, req.srcIP, req.answeringForIP, respondIface.HardwareAddr, respondType)
+		} else {
+			if respondType == ndp_ADV {
+				success := false
+				req.dstIP, success = getAddressFromQuestionListRetry(req.answeringForIP, ndpQuestionChan, ndpQuestionsList)
+				if !success {
+					if GlobalDebug {
+						fmt.Println("Nobody has asked for this IP")
+					}
+					continue
+				}
+			} else {
+				ndpQuestionChan <- &ndpQuestion{
+					targetIP: req.answeringForIP,
+					askedBy:  req.srcIP,
+				}
+			}
+			pkt(fd, result, req.dstIP, req.answeringForIP, respondIface.HardwareAddr, respondType)
+		}
+	}
+}
+
+func pkt(fd int, ownIP []byte, dstIP []byte, tgtip []byte, mac []byte, respondType ndpType) {
+	v6, err := newIpv6Header(ownIP, dstIP)
+	if err != nil {
+		return
+	}
+	NDPa, err := newNdpPacket(tgtip, mac, respondType)
+	if err != nil {
+		return
+	}
+	v6.addPayload(NDPa)
+	response := v6.constructPacket()
+
+	var t [16]byte
+	copy(t[:], dstIP)
+
+	d := syscall.SockaddrInet6{
+		Port: 0,
+		Addr: t,
+	}
+	if GlobalDebug {
+		fmt.Println("Sending packet of type", respondType, "to")
+		fmt.Printf("% X\n", t)
+	}
+	err = syscall.Sendto(fd, response, 0, &d)
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+}
+
+func getAddressFromQuestionListRetry(targetIP []byte, ndpQuestionChan chan *ndpQuestion, ndpQuestionsList []*ndpQuestion) ([]byte, bool) {
+	success := false
+	var result []byte
+	result, success = getAddressFromQuestionList(targetIP, ndpQuestionsList)
+	if success {
+		return result, true
+	}
+
+	gotBuffered := false
+	select {
+	case q := <-ndpQuestionChan:
+		ndpQuestionsList = append(ndpQuestionsList, q)
+		gotBuffered = true
+	default:
+	}
+
+	if gotBuffered {
+		result, success = getAddressFromQuestionList(targetIP, ndpQuestionsList)
+	}
+
+	return nil, false
+}
+
+func getAddressFromQuestionList(targetIP []byte, ndpQuestionsList []*ndpQuestion) ([]byte, bool) {
+	for i := range ndpQuestionsList {
+		if bytes.Equal((*ndpQuestionsList[i]).targetIP, targetIP) {
+			result := (*ndpQuestionsList[i]).askedBy
+			ndpQuestionsList = removeFromQuestionList(ndpQuestionsList, i)
+			return result, true
+		}
+	}
+	return nil, false
+}
+func removeFromQuestionList(s []*ndpQuestion, i int) []*ndpQuestion {
+	s[i] = s[len(s)-1]
+	return s[:len(s)-1]
+}
+
+func cleanupQuestionList(s []*ndpQuestion) []*ndpQuestion {
+	for len(s) >= 40 {
+		s = removeFromQuestionList(s, 0)
+	}
+	return s
+}
+
+func selectSourceIP(iface *net.Interface) []byte {
+	var _, ulaSpace, _ = net.ParseCIDR("fc00::/7")
+	var result = emptyIpv6
+	ifaceaddrs, err := iface.Addrs()
+	if err != nil {
+		return result
+	}
+
+	for _, n := range ifaceaddrs {
+		tip, _, err := net.ParseCIDR(n.String())
+		if err != nil {
+			break
+		}
+		var haveUla = false
+		if isIpv6(tip.String()) {
+			if tip.IsGlobalUnicast() {
+				haveUla = true
+				result = tip
+
+				if !ulaSpace.Contains(tip) {
+					break
+				}
+			} else if tip.IsLinkLocalUnicast() && !haveUla {
+				result = tip
+			}
+		}
+	}
+	return result
+}
--- a/pndpd.conf
+++ b/pndpd.conf
@ -0,0 +1,40 @@
+// Example config file for PNDPD
+
+// Enable or disable debug
+// If enabled, this option can fill up your logfiles very quickly
+debug off
+
+// Responder example
+// Create an NDP responder that answers on interface "eth0"
+responder {
+    iface eth0
+    filter fd01::/64
+    filter fd02::/64
+}
+
+// Proxy example
+// Create an NDP proxy for proxying NDP between iface1 ("eth0") and iface2 ("eth1")
+// The whitelist is applied on iface2
+proxy {
+    iface1 eth0
+    iface2 eth1
+    filter fd01::/64
+    filter fd02::/64
+}
+
+
+// Responder example with autoconfigured whitelist
+// The whitelist is configured based on the addresses assigned to the interface specified. This works even if the IP addresses change frequently.
+responder {
+    iface eth0
+    autosense eth0
+}
+
+// Proxy example with autoconfigured whitelist
+// The whitelist is configured based on the addresses assigned to the interface specified. This works even if the IP addresses change frequently.
+// The whitelist is applied to iface2
+proxy {
+    iface1 eth0
+    iface2 eth1
+    autosense eth1
+}
--- a/pndpd.service
+++ b/pndpd.service
@ -0,0 +1,18 @@
+[Unit]
+Description=Proxy NDP Daemon
+Wants=network-online.target
+After=network.target network-online.target
+
+[Service]
+Type=simple
+Restart=on-failure
+RestartSec=5s
+ExecStart=/usr/local/bin/pndpd config /etc/pndpd/pndpd.conf
+
+DynamicUser=yes
+AmbientCapabilities=CAP_NET_RAW CAP_NET_ADMIN
+CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN
+ProtectHome=yes
+
+[Install]
+WantedBy=multi-user.target
--- a/process.go
+++ b/process.go
@ -1,98 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"net"
-	"os"
-	"os/signal"
-	"runtime/pprof"
-	"strings"
-	"sync"
-	"syscall"
-	"time"
-)
-
-var GlobalDebug = false
-
-// Items needed for graceful shutdown
-var stop = make(chan struct{})
-var stopWg sync.WaitGroup
-var sigCh = make(chan os.Signal)
-
-func waitForSignal() {
-	signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
-	<-sigCh
-	fmt.Println("Shutting down...")
-	close(stop)
-	if wgWaitTimout(&stopWg, 10*time.Second) {
-		fmt.Println("Done")
-	} else {
-		fmt.Println("Aborting shutdown, since it is taking too long")
-		pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
-	}
-
-	os.Exit(0)
-}
-
-func wgWaitTimout(wg *sync.WaitGroup, timeout time.Duration) bool {
-	t := make(chan struct{})
-	go func() {
-		defer close(t)
-		wg.Wait()
-	}()
-	select {
-	case <-t:
-		return true
-	case <-time.After(timeout):
-		return false
-	}
-}
-
-func simpleRespond(iface string, filter []*net.IPNet) {
-	defer stopWg.Done()
-	stopWg.Add(3) // This function, 2x goroutines
-	requests := make(chan *NDRequest, 100)
-	defer close(requests)
-	go respond(iface, requests, NDP_ADV, filter)
-	go listen(iface, requests, NDP_SOL)
-	<-stop
-}
-
-func proxy(iface1, iface2 string) {
-	defer stopWg.Done()
-	stopWg.Add(9) // This function, 8x goroutines
-
-	req_iface1_sol_iface2 := make(chan *NDRequest, 100)
-	defer close(req_iface1_sol_iface2)
-	go listen(iface1, req_iface1_sol_iface2, NDP_SOL)
-	go respond(iface2, req_iface1_sol_iface2, NDP_SOL, nil)
-
-	req_iface2_sol_iface1 := make(chan *NDRequest, 100)
-	defer close(req_iface2_sol_iface1)
-	go listen(iface2, req_iface2_sol_iface1, NDP_SOL)
-	go respond(iface1, req_iface2_sol_iface1, NDP_SOL, nil)
-
-	req_iface1_adv_iface2 := make(chan *NDRequest, 100)
-	defer close(req_iface1_adv_iface2)
-	go listen(iface1, req_iface1_adv_iface2, NDP_ADV)
-	go respond(iface2, req_iface1_adv_iface2, NDP_ADV, nil)
-
-	req_iface2_adv_iface1 := make(chan *NDRequest, 100)
-	defer close(req_iface2_adv_iface1)
-	go listen(iface2, req_iface2_adv_iface1, NDP_ADV)
-	go respond(iface1, req_iface2_adv_iface1, NDP_ADV, nil)
-	<-stop
-}
-
-func parseFilter(f string) []*net.IPNet {
-	s := strings.Split(f, ";")
-	result := make([]*net.IPNet, len(s))
-	for i, n := range s {
-		_, cidr, err := net.ParseCIDR(n)
-		if err != nil {
-			panic(err)
-		}
-		result[i] = cidr
-	}
-	return result
-}
--- a/rawsocket.go
+++ b/rawsocket.go
@ -1,133 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"golang.org/x/net/bpf"
-	"golang.org/x/sys/unix"
-	"net"
-	"syscall"
-	"unsafe"
-)
-
-// Filter represents a classic BPF filter program that can be applied to a socket
-type Filter []bpf.Instruction
-
-// ApplyTo applies the current filter onto the provided file descriptor
-func (filter Filter) ApplyTo(fd int) (err error) {
-	var assembled []bpf.RawInstruction
-	if assembled, err = bpf.Assemble(filter); err != nil {
-		return err
-	}
-
-	var program = unix.SockFprog{
-		Len:    uint16(len(assembled)),
-		Filter: (*unix.SockFilter)(unsafe.Pointer(&assembled[0])),
-	}
-	var b = (*[unix.SizeofSockFprog]byte)(unsafe.Pointer(&program))[:unix.SizeofSockFprog]
-
-	if _, _, errno := syscall.Syscall6(syscall.SYS_SETSOCKOPT,
-		uintptr(fd), uintptr(syscall.SOL_SOCKET), uintptr(syscall.SO_ATTACH_FILTER),
-		uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0); errno != 0 {
-		return errno
-	}
-
-	return nil
-}
-
-// Htons Convert a uint16 to host byte order (big endian)
-func htons(v uint16) int {
-	return int((v << 8) | (v >> 8))
-}
-func htons16(v uint16) uint16 { return v<<8 | v>>8 }
-
-func listen(iface string, responder chan *NDRequest, requestType NDPType) {
-	niface, err := net.InterfaceByName(iface)
-	if err != nil {
-		panic(err.Error())
-	}
-	tiface := &syscall.SockaddrLinklayer{
-		Protocol: htons16(syscall.ETH_P_IPV6),
-		Ifindex:  niface.Index,
-	}
-
-	fd, err := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_RAW, htons(syscall.ETH_P_IPV6))
-	if err != nil {
-		fmt.Println(err.Error())
-	}
-	go func() {
-		<-stop
-		syscall.Close(fd)
-		stopWg.Done() // syscall.read does not release when the file descriptor is closed
-	}()
-	fmt.Println("Obtained fd ", fd)
-
-	if len([]byte(iface)) > syscall.IFNAMSIZ {
-		panic("Interface size larger then maximum allowed by the kernel")
-	}
-
-	err = syscall.Bind(fd, tiface)
-	if err != nil {
-		panic(err.Error())
-	}
-
-	var protocolNo uint32
-	if requestType == NDP_SOL {
-		//Neighbor Solicitation
-		protocolNo = 0x87
-	} else {
-		//Neighbor Advertisement
-		protocolNo = 0x88
-	}
-
-	var f Filter = []bpf.Instruction{
-		// Load "EtherType" field from the ethernet header.
-		bpf.LoadAbsolute{Off: 12, Size: 2},
-		// Jump to the drop packet instruction if EtherType is not IPv6.
-		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x86dd, SkipTrue: 4},
-		// Load "Next Header" field from IPV6 header.
-		bpf.LoadAbsolute{Off: 20, Size: 1},
-		// Jump to the drop packet instruction if Next Header is not ICMPv6.
-		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x3a, SkipTrue: 2},
-		// Load "Type" field from ICMPv6 header.
-		bpf.LoadAbsolute{Off: 54, Size: 1},
-		// Jump to the drop packet instruction if Type is not Neighbor Solicitation / Advertisement.
-		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: protocolNo, SkipTrue: 1},
-		// Verdict is "send up to 4k of the packet to userspace."buf
-		bpf.RetConstant{Val: 4096},
-		// Verdict is "ignore packet."
-		bpf.RetConstant{Val: 0},
-	}
-
-	err = f.ApplyTo(fd)
-	if err != nil {
-		panic(err.Error())
-	}
-
-	for {
-		buf := make([]byte, 4096)
-		numRead, err := syscall.Read(fd, buf)
-		if err != nil {
-			panic(err)
-		}
-		if GlobalDebug {
-			fmt.Println("Source IP:")
-			fmt.Printf("% X\n", buf[:numRead][22:38])
-			fmt.Println("Destination IP:")
-			fmt.Printf("% X\n", buf[:numRead][38:54])
-			fmt.Println("Requested IP:")
-			fmt.Printf("% X\n", buf[:numRead][62:78])
-			fmt.Println("Source MAC")
-			fmt.Printf("% X\n", buf[:numRead][80:86])
-			fmt.Println()
-		}
-		responder <- &NDRequest{
-			requestType:      requestType,
-			srcIP:            buf[:numRead][22:38],
-			dstIP:            buf[:numRead][38:54],
-			answeringForIP:   buf[:numRead][62:78],
-			mac:              buf[:numRead][80:86],
-			receivedIfaceMac: niface.HardwareAddr,
-			sourceIface:      iface,
-		}
-	}
-}
--- a/responder.go
+++ b/responder.go
@ -1,108 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"net"
-	"syscall"
-)
-
-var globalFd int
-
-func respond(iface string, requests chan *NDRequest, respondType NDPType, filter []*net.IPNet) {
-	defer stopWg.Done()
-	fd, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_RAW, syscall.IPPROTO_RAW)
-	if err != nil {
-		panic(err)
-	}
-	defer syscall.Close(globalFd)
-	globalFd = fd
-	err = syscall.BindToDevice(fd, iface)
-	if err != nil {
-		panic(err)
-	}
-
-	niface, err := net.InterfaceByName(iface)
-	if err != nil {
-		panic(err.Error())
-	}
-
-	var result = emptyIpv6
-	ifaceaddrs, err := niface.Addrs()
-
-	for _, n := range ifaceaddrs {
-		tip, _, err := net.ParseCIDR(n.String())
-		if err != nil {
-			break
-		}
-		if IsIPv6(tip.String()) {
-			if tip.IsGlobalUnicast() {
-				result = tip
-				_, tnet, _ := net.ParseCIDR("fc00::/7")
-				if !tnet.Contains(tip) {
-					break
-				}
-			}
-		}
-	}
-
-	for {
-		var n *NDRequest
-		select {
-		case <-stop:
-			return
-		case n = <-requests:
-		}
-
-		if filter != nil {
-			ok := false
-			for _, i := range filter {
-				if i.Contains(n.answeringForIP) {
-					fmt.Println("filter allowed IP", n.answeringForIP)
-					ok = true
-					break
-				}
-			}
-			if !ok {
-				continue
-			}
-		}
-
-		if n.sourceIface == iface {
-			pkt(result, n.srcIP, n.answeringForIP, niface.HardwareAddr, respondType)
-		} else {
-			if !bytes.Equal(n.mac, n.receivedIfaceMac) {
-				pkt(n.srcIP, n.dstIP, n.answeringForIP, niface.HardwareAddr, respondType)
-			}
-		}
-	}
-}
-
-func pkt(ownIP []byte, dstIP []byte, tgtip []byte, mac []byte, respondType NDPType) {
-	v6, err := newIpv6Header(ownIP, dstIP)
-	if err != nil {
-		return
-	}
-	NDPa, err := newNdpPacket(tgtip, mac, respondType)
-	if err != nil {
-		return
-	}
-	v6.addPayload(NDPa)
-	response := v6.constructPacket()
-
-	var t [16]byte
-	copy(t[:], dstIP)
-
-	d := syscall.SockaddrInet6{
-		Port: 0,
-		Addr: t,
-	}
-	if GlobalDebug {
-		fmt.Println("Sending packet of type", respondType, "to")
-		fmt.Printf("% X\n", t)
-	}
-	err = syscall.Sendto(globalFd, response, 0, &d)
-	if err != nil {
-		fmt.Println(err.Error())
-	}
-}
Author	SHA1	Message	Date
Simon Marsh	e5b04565ec	add go vet All checks were successful continuous-integration/drone/push Build is passing Details	2022-01-27 15:16:02 +00:00
Simon Marsh	58ac05adc9	fix drone	2022-01-27 15:16:02 +00:00
Simon Marsh	b3d2305f9d	burble.dn42 customizations	2022-01-27 15:16:02 +00:00
Kioubit	dff2f9ab10	Update README.md	2022-01-09 08:49:20 -05:00
Kioubit	49c6c333e9	Better user input validation, always clear filter slice	2022-01-09 08:32:25 -05:00
Kioubit	a7eb52c0c5	No longer set SIOCGIFFLAGS, update README.md	2022-01-07 07:20:32 -05:00
Kioubit	ede44e8426	Set PACKET_ADD_MEMBERSHIP	2022-01-04 17:40:40 -05:00
Kioubit	d8c439aad9	Remove unnecessary makefile option	2022-01-04 15:49:31 -05:00
Kioubit	48486cc205	set IFF_PROMISC	2022-01-04 15:48:28 -05:00
Kioubit	1f294666f3	Refresh selected source IP when autosense	2021-12-28 15:42:13 -05:00
Kioubit	95bf95784e	Add version information to binaries	2021-12-28 12:52:06 -05:00
Kioubit	1da76a4547	Don't check for unnecessary flags, fix potential bottleneck	2021-12-28 12:48:52 -05:00
Kioubit	b7c5e6afba	Add build for multiple architectures, streamline process	2021-12-28 07:43:59 -05:00
Kioubit	1ec9477d69	Fix autosense not working	2021-12-28 06:44:49 -05:00
Kioubit	2e62c0b5d5	Build tags for modules	2021-12-28 06:19:19 -05:00
Kioubit	ff27eb5141	Documentation update	2021-12-27 12:09:59 -05:00
Kioubit	4ddaa98351	Merge pull request #1 from jlu5/patch-1 Simplify wget instructions; use FHS compliant paths	2021-12-27 12:02:59 -05:00
Kioubit	6ebee06861	Make the user interface a module, Rework modules	2021-12-27 11:25:52 -05:00
Kioubit	0f580cbbbd	Small code optimizations	2021-12-27 08:33:10 -05:00
Kioubit	5a901eada3	Fix unbuffered os.Signal channel error	2021-12-27 06:37:08 -05:00
James Lu	504daad9e1	Simplify wget instructions; use FHS compliant paths Paths under /usr/bin and /usr/lib are generally managed by the system package manager; use /usr/local/bin and /etc instead	2021-12-27 01:52:30 -08:00
Kioubit	11110fb66b	Update Documentation	2021-12-26 08:02:49 -05:00
Kioubit	e3d463e815	Bump Version	2021-12-26 07:15:10 -05:00
Kioubit	45b9ac5e86	Set Interface Allmulti flag	2021-12-26 07:13:48 -05:00
Kioubit	de4d228950	Bump Version	2021-12-26 11:53:27 +01:00
Kioubit	d196469c01	isIpv6 fix	2021-12-26 11:50:35 +01:00
Kioubit	f8f0d0d055	Documentation	2021-12-25 22:25:58 +01:00
Kioubit	d6421a007e	Better module support	2021-12-25 13:03:11 -05:00
Kioubit	6948f5a30d	Support modules	2021-12-25 09:28:59 -05:00
Kioubit	3491a47811	Add installation instructions	2021-12-25 08:29:57 -05:00
Kioubit	d3a5059aa2	More Fixes and optimization	2021-12-25 08:21:07 -05:00
Kioubit	ce659c31d8	Fixes	2021-12-24 18:06:32 -05:00
Kioubit	bef2b5d3ef	Fix BPF Filter	2021-12-24 18:04:09 -05:00
Kioubit	8562c2f533	Bump Version	2021-12-24 17:14:09 -05:00
Kioubit	7d831f2f0b	Fix checksum	2021-12-24 17:11:11 -05:00
Kioubit	c7da34fc9e	Bump version	2021-12-24 17:05:15 -05:00
Kioubit	28298d916d	Fix checksum	2021-12-24 17:04:18 -05:00
Kioubit	a1d77463da	Code Optimization	2021-12-24 16:58:44 -05:00
Kioubit	2dde03d5c4	Bump Version	2021-12-24 16:46:45 -05:00
Kioubit	94b1683c8d	Improvements and Fixes to proxying	2021-12-24 16:43:49 -05:00
Kioubit	f69d8c190e	Add more debug information	2021-12-24 13:07:19 -05:00
Kioubit	99e48b6103	Fix documentation, add gitignore	2021-12-24 12:02:22 -05:00
Kioubit	282205f743	Add autosense, add config, overhaul code	2021-12-24 11:19:36 -05:00
Kioubit	04c3526c8b	Add License	2021-12-23 07:57:02 -05:00
Kioubit	938e5e1a91	Documentation	2021-12-22 07:14:51 -05:00
Kioubit	57e9d65a31	Update README.md	2021-12-22 07:12:13 -05:00
Kioubit	4132a2b58c	Update README.md	2021-12-22 07:11:12 -05:00
Kioubit	77165e5b39	Update README.md	2021-12-22 07:06:22 -05:00
Kioubit	2b18c35dba	Refactor code	2021-12-22 07:01:30 -05:00