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main.go
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main.go
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package main
import (
"fmt"
"github.com/google/netstack/tcpip"
"github.com/google/netstack/tcpip/network/ipv4"
"github.com/google/netstack/tcpip/network/ipv6"
"github.com/google/netstack/tcpip/stack"
"github.com/google/netstack/tcpip/transport/tcp"
"github.com/google/netstack/waiter"
"github.com/songgao/water"
"log"
"math/rand"
"net"
"os"
"reflect"
"strconv"
"strings"
"time"
"tun2socks/tunbased"
)
// echo service
func echo(wq *waiter.Queue, ep tcpip.Endpoint) {
defer ep.Close()
// Create wait queue entry that notifies a channel.
waitEntry, notifyCh := waiter.NewChannelEntry(nil)
wq.EventRegister(&waitEntry, waiter.EventIn)
defer wq.EventUnregister(&waitEntry)
for {
v, _, err := ep.Read(nil)
if err != nil {
if err == tcpip.ErrWouldBlock {
<-notifyCh
continue
}
return
}
ep.Write(tcpip.SlicePayload(v), tcpip.WriteOptions{})
}
}
func getFieldItem(target reflect.Value, fieldName string) reflect.Value {
names := strings.Split(fieldName, ".")
cntName := names[0]
for i := 0; i < target.NumField(); i++ {
name := target.Type().Field(i).Name
value := target.Field(i)
if name != cntName {
continue
}
if len(names) >= 2 {
return getFieldItem(value, strings.Join(names[1:], ","))
}
return value
}
panic(fmt.Sprintf("%v field:%s not found", target, fieldName))
}
// go build -o tun_tcp_echo
// sudo ./tun_tcp_echo utun2 10.0.0.2 8090
// telnet 10.0.0.2 8090
func main() {
if len(os.Args) != 4 {
log.Fatal("Usage: ", os.Args[0], " <tun-device> <local-address> <local-port>")
}
// tunName := os.Args[1]
addrName := os.Args[2]
portName := os.Args[3]
rand.Seed(time.Now().UnixNano())
log.SetFlags(log.LstdFlags | log.Lshortfile)
// Parse the IP address. Support both ipv4 and ipv6.
parsedAddr := net.ParseIP(addrName)
if parsedAddr == nil {
log.Fatalf("Bad IP address: %v", addrName)
}
var addr tcpip.Address
var proto tcpip.NetworkProtocolNumber
if parsedAddr.To4() != nil {
addr = tcpip.Address(parsedAddr.To4())
proto = ipv4.ProtocolNumber
} else if parsedAddr.To16() != nil {
addr = tcpip.Address(parsedAddr.To16())
proto = ipv6.ProtocolNumber
} else {
log.Fatalf("Unknown IP type: %v", addrName)
}
localPort, err := strconv.Atoi(portName)
if err != nil {
log.Fatalf("Unable to convert port %v: %v", portName, err)
}
// Create the stack with ip and tcp protocols, then add a tun-based
// NIC and address.
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocol{ipv4.NewProtocol(), ipv6.NewProtocol()},
TransportProtocols: []stack.TransportProtocol{tcp.NewProtocol()},
})
var mtu uint32 = 1500
// Parse the mac address.
maddr, err := net.ParseMAC("aa:00:01:01:01:01")
if err != nil {
log.Fatalf("Bad MAC address: aa:00:01:01:01:01")
}
ifce, err := water.New(tunbased.GetCfg())
if err != nil {
log.Fatalf("tun/tap can't init. err:%v", err)
}
tunbased.Ifconfig(ifce.Name(), "10.0.0.2/24", mtu)
linkEP, err := tunbased.New(&tunbased.Options{
Ifce: ifce,
MTU: mtu,
EthernetHeader: false,
Address: tcpip.LinkAddress(maddr),
})
if err != nil {
log.Fatal(err)
}
if err := s.CreateNIC(1, linkEP); err != nil {
log.Fatal(err)
}
if err := s.AddAddress(1, proto, addr); err != nil {
log.Fatal(err)
}
//if err := s.AddAddress(1, arp.ProtocolNumber, arp.ProtocolAddress); err != nil {
// log.Fatal(err)
//}
subnet, err := tcpip.NewSubnet(
tcpip.Address(strings.Repeat("\x00", len(addr))),
tcpip.AddressMask(strings.Repeat("\x00", len(addr))),
)
if err != nil {
log.Fatal(err)
}
// Add default route.
s.SetRouteTable([]tcpip.Route{
{
Destination: subnet,
NIC: 1,
},
})
// Create TCP endpoint, bind it, then start listening.
var wq waiter.Queue
ep, e := s.NewEndpoint(tcp.ProtocolNumber, proto, &wq)
if err != nil {
log.Fatal(e)
}
defer ep.Close()
log.Printf("listening:%d", localPort)
if err := ep.Bind(tcpip.FullAddress{0, "", uint16(localPort)}); err != nil {
log.Fatal("Bind failed: ", err)
}
if err := ep.Listen(10); err != nil {
log.Fatal("Listen failed: ", err)
}
// Wait for connections to appear.
waitEntry, notifyCh := waiter.NewChannelEntry(nil)
wq.EventRegister(&waitEntry, waiter.EventIn)
defer wq.EventUnregister(&waitEntry)
for {
n, wq, err := ep.Accept()
if err != nil {
if err == tcpip.ErrWouldBlock {
<-notifyCh
continue
}
log.Fatal("Accept() failed:", err)
}
go echo(wq, n)
}
}