package main

Variables

Addresses to exchange:

var NewIP net.IP
var NewMAC net.HardwareAddr
var OldIP net.IP
var OldMAC net.HardwareAddr

In-/Output to VM and network:

var NetReader io.Reader
var NetWriter io.Writer
var VmReader io.Reader
var VmWriter io.Writer

DHCP variables:

var DHCPCandidate net.IP
var DHCPDNSIP net.IP
var DHCPIP net.IP
var DHCPMAC net.HardwareAddr
var DHCPMask []byte
var DHCPRouterIP net.IP
var DHCPState dhcp4.MessageType
var DHCPXId []byte

User-provided variables:

var Hostname string
var Passthrough bool
var Wireshark bool

UId used as host name:

var UId string

Functions

func filterIP(prefix string, dst interface{}, src interface{}, context gopacket.LayerType)

filterIP checks whether an IP target selected from src and dst equals a given value. If yes, it is changed

func filterMAC(prefix string, dst interface{}, src interface{}, context gopacket.LayerType)

filterMAC checks whether a MAC target selected from src and dst equals a given value. If yes, it is changed

func filterPayload(prefix string, payload *[]byte)

filterPayloads filters binary payloads to be able to process unsupported protocols

func handleDHCP(content []byte, dstMAC net.HardwareAddr, srcMAC net.HardwareAddr, prefix string)

handleDHCP provides the main DHCP functionality to request an IP from a server on the one hand and provide an IP to the VM on the other hand

func main()

Start the two plugs and run two concurrent forward methods

func pipeForward(prefix string)

Reads from an input and writes to and output, do things to the content in between. Is meant to be run concurrently with "go pipeForward(...)". This is the main loop of the proxy.

func sendDHCPReply(req dhcp4.Packet, mt dhcp4.MessageType, lease net.IP, reqOpt dhcp4.Options, dstMAC net.HardwareAddr)

sendDHCPReply creates a response DHCP packet for the VM and sends it

func sendDHCPRequest(mt dhcp4.MessageType, reqIP net.IP)

sendDHCPRequest creates a request DHCP packet for the server and sends it

package main

Variables

Addresses to exchange:
In-/Output to VM and network:
DHCP variables:
User-provided variables:
UId used as host name:

Functions

func filterIP(prefix string, dst interface{}, src interface{}, context gopacket.LayerType)
func filterMAC(prefix string, dst interface{}, src interface{}, context gopacket.LayerType)
func filterPayload(prefix string, payload *[]byte)
func handleDHCP(content []byte, dstMAC net.HardwareAddr, srcMAC net.HardwareAddr, prefix string)
func main()
func pipeForward(prefix string)
func sendDHCPReply(req dhcp4.Packet, mt dhcp4.MessageType, lease net.IP, reqOpt dhcp4.Options, dstMAC net.HardwareAddr)
func sendDHCPRequest(mt dhcp4.MessageType, reqIP net.IP)