netstack: introduce new module for gvisor tcp tun adapter
The Go linker isn't smart enough to prevent gvisor from being pulled into modules that use other parts of tun/, due to the types exposed. So, we put this into its own standalone module. We use this as an opportunity to introduce some example code as well. I'm still not happy that this not only clutters this repo's go.sum, but all the other projects that consume it, but it seems like making a new module inside of this repo will lead to even greater confusion. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
294d3bedf9
commit
1d4eb2727a
50
tun/netstack/examples/http_client.go
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50
tun/netstack/examples/http_client.go
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@ -0,0 +1,50 @@
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// +build ignore
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
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*/
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package main
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import (
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"io"
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"log"
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"net"
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"net/http"
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"golang.zx2c4.com/wireguard/device"
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"golang.zx2c4.com/wireguard/tun/netstack"
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)
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func main() {
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tun, tnet, err := netstack.CreateNetTUN(
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[]net.IP{net.ParseIP("192.168.4.29")},
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[]net.IP{net.ParseIP("8.8.8.8")},
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1420)
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if err != nil {
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log.Panic(err)
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}
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dev := device.NewDevice(tun, &device.Logger{log.Default(), log.Default(), log.Default()})
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dev.IpcSet(`private_key=a8dac1d8a70a751f0f699fb14ba1cff7b79cf4fbd8f09f44c6e6a90d0369604f
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public_key=25123c5dcd3328ff645e4f2a3fce0d754400d3887a0cb7c56f0267e20fbf3c5b
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endpoint=163.172.161.0:12912
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allowed_ip=0.0.0.0/0
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`)
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dev.Up()
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client := http.Client{
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Transport: &http.Transport{
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DialContext: tnet.DialContext,
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},
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}
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resp, err := client.Get("https://www.zx2c4.com/ip")
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if err != nil {
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log.Panic(err)
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}
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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log.Panic(err)
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}
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log.Println(string(body))
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}
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48
tun/netstack/examples/http_server.go
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48
tun/netstack/examples/http_server.go
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@ -0,0 +1,48 @@
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// +build ignore
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
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*/
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package main
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import (
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"golang.zx2c4.com/wireguard/device"
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"golang.zx2c4.com/wireguard/tun/netstack"
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"io"
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"log"
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"net"
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"net/http"
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)
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func main() {
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tun, tnet, err := netstack.CreateNetTUN(
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[]net.IP{net.ParseIP("192.168.4.29")},
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[]net.IP{net.ParseIP("8.8.8.8"), net.ParseIP("8.8.4.4")},
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1420,
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)
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if err != nil {
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log.Panic(err)
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}
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dev := device.NewDevice(tun, &device.Logger{log.Default(), log.Default(), log.Default()})
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dev.IpcSet(`private_key=a8dac1d8a70a751f0f699fb14ba1cff7b79cf4fbd8f09f44c6e6a90d0369604f
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public_key=25123c5dcd3328ff645e4f2a3fce0d754400d3887a0cb7c56f0267e20fbf3c5b
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endpoint=163.172.161.0:12912
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allowed_ip=0.0.0.0/0
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persistent_keepalive_interval=25
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`)
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dev.Up()
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listener, err := tnet.ListenTCP(&net.TCPAddr{Port: 80})
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if err != nil {
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log.Panicln(err)
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}
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http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
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log.Printf("> %s - %s - %s", request.RemoteAddr, request.URL.String(), request.UserAgent())
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io.WriteString(writer, "Hello from userspace TCP!")
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})
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err = http.Serve(listener, nil)
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if err != nil {
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log.Panicln(err)
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}
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}
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@ -3,7 +3,7 @@
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* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
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*/
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package tun
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package netstack
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import (
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"context"
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@ -18,6 +18,8 @@ import (
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"strings"
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"time"
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"golang.zx2c4.com/wireguard/tun"
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"golang.org/x/net/dns/dnsmessage"
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"gvisor.dev/gvisor/pkg/tcpip"
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"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
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@ -33,7 +35,7 @@ import (
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type netTun struct {
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stack *stack.Stack
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dispatcher stack.NetworkDispatcher
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events chan Event
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events chan tun.Event
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incomingPacket chan buffer.VectorisedView
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mtu int
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dnsServers []net.IP
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@ -88,7 +90,7 @@ func (*endpoint) ARPHardwareType() header.ARPHardwareType {
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func (e *endpoint) AddHeader(local, remote tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) {
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}
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func CreateNetTUN(localAddresses []net.IP, dnsServers []net.IP, mtu int) (Device, *Net, error) {
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func CreateNetTUN(localAddresses []net.IP, dnsServers []net.IP, mtu int) (tun.Device, *Net, error) {
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opts := stack.Options{
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NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},
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TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol},
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@ -96,7 +98,7 @@ func CreateNetTUN(localAddresses []net.IP, dnsServers []net.IP, mtu int) (Device
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}
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dev := &netTun{
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stack: stack.New(opts),
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events: make(chan Event, 10),
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events: make(chan tun.Event, 10),
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incomingPacket: make(chan buffer.VectorisedView),
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dnsServers: dnsServers,
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mtu: mtu,
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@ -127,7 +129,7 @@ func CreateNetTUN(localAddresses []net.IP, dnsServers []net.IP, mtu int) (Device
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dev.stack.AddRoute(tcpip.Route{Destination: header.IPv6EmptySubnet, NIC: 1})
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}
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dev.events <- EventUp
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dev.events <- tun.EventUp
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return dev, (*Net)(dev), nil
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}
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@ -139,7 +141,7 @@ func (tun *netTun) File() *os.File {
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return nil
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}
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func (tun *netTun) Events() chan Event {
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func (tun *netTun) Events() chan tun.Event {
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return tun.events
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}
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