mirror of
https://github.com/KusakabeShi/EtherGuard-VPN.git
synced 2024-11-29 02:33:17 +01:00
99 lines
2.4 KiB
Go
99 lines
2.4 KiB
Go
package tap
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/KusakabeSi/EtherGuard-VPN/mtypes"
|
|
)
|
|
|
|
type UdpSockTap struct {
|
|
name string
|
|
mtu int
|
|
recv *net.UDPConn
|
|
send *net.UDPAddr
|
|
static bool
|
|
events chan Event
|
|
}
|
|
|
|
// New creates and returns a new TUN interface for the application.
|
|
func CreateUDPSockTAP(iconfig mtypes.InterfaceConf, NodeID mtypes.Vertex) (tapdev Device, err error) {
|
|
// Setup TUN Config
|
|
|
|
tap := &UdpSockTap{
|
|
name: iconfig.Name,
|
|
mtu: 1500,
|
|
recv: nil,
|
|
send: nil,
|
|
static: false,
|
|
events: make(chan Event, 1<<5),
|
|
}
|
|
|
|
if iconfig.RecvAddr == "" && iconfig.SendAddr == "" {
|
|
return nil, errors.New("At least one of RecvAddr or SendAddr required.")
|
|
}
|
|
|
|
if iconfig.RecvAddr == "" {
|
|
iconfig.RecvAddr = ":0"
|
|
}
|
|
listenAddr, err := net.ResolveUDPAddr("udp", iconfig.RecvAddr)
|
|
if err != nil {
|
|
fmt.Println(err.Error())
|
|
return nil, err
|
|
}
|
|
listener, err := net.ListenUDP("udp", listenAddr)
|
|
if err != nil {
|
|
fmt.Println(err.Error())
|
|
return nil, err
|
|
}
|
|
tap.recv = listener
|
|
|
|
if iconfig.SendAddr != "" {
|
|
sendAddr, err := net.ResolveUDPAddr("udp", iconfig.SendAddr)
|
|
if err != nil {
|
|
fmt.Println(err.Error())
|
|
return nil, err
|
|
}
|
|
tap.send = sendAddr
|
|
tap.static = true
|
|
}
|
|
|
|
tapdev = tap
|
|
tapdev.Events() <- EventUp
|
|
return
|
|
}
|
|
|
|
// SetMTU sets the Maximum Tansmission Unit Size for a
|
|
// Packet on the interface.
|
|
|
|
func (tap *UdpSockTap) Read(buf []byte, offset int) (int, error) {
|
|
size, source, err := tap.recv.ReadFromUDP(buf[offset:])
|
|
if tap.static == false {
|
|
tap.send = source
|
|
}
|
|
return size, err
|
|
} // read a packet from the device (without any additional headers)
|
|
func (tap *UdpSockTap) Write(buf []byte, offset int) (size int, err error) {
|
|
size, err = tap.recv.WriteToUDP(buf[offset:], tap.send)
|
|
return
|
|
} // writes a packet to the device (without any additional headers)
|
|
func (tap *UdpSockTap) Flush() error {
|
|
return nil
|
|
} // flush all previous writes to the device
|
|
func (tap *UdpSockTap) MTU() (int, error) {
|
|
return tap.mtu, nil
|
|
} // returns the MTU of the device
|
|
func (tap *UdpSockTap) Name() (string, error) {
|
|
return tap.name, nil
|
|
} // fetches and returns the current name
|
|
func (tap *UdpSockTap) Events() chan Event {
|
|
return tap.events
|
|
} // returns a constant channel of events related to the device
|
|
func (tap *UdpSockTap) Close() error {
|
|
tap.events <- EventDown
|
|
tap.recv.Close()
|
|
close(tap.events)
|
|
return nil
|
|
} // stops the device and closes the event channel
|