mirror of https://github.com/slackhq/nebula.git
137 lines
3.1 KiB
Go
137 lines
3.1 KiB
Go
//go:build e2e_testing
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// +build e2e_testing
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package overlay
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import (
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"fmt"
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"io"
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"net/netip"
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"os"
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"sync/atomic"
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"github.com/gaissmai/bart"
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"github.com/sirupsen/logrus"
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"github.com/slackhq/nebula/config"
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)
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type TestTun struct {
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Device string
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cidr netip.Prefix
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Routes []Route
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routeTree *bart.Table[netip.Addr]
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l *logrus.Logger
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closed atomic.Bool
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rxPackets chan []byte // Packets to receive into nebula
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TxPackets chan []byte // Packets transmitted outside by nebula
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}
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func newTun(c *config.C, l *logrus.Logger, cidr netip.Prefix, _ bool) (*TestTun, error) {
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_, routes, err := getAllRoutesFromConfig(c, cidr, true)
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if err != nil {
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return nil, err
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}
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routeTree, err := makeRouteTree(l, routes, false)
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if err != nil {
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return nil, err
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}
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return &TestTun{
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Device: c.GetString("tun.dev", ""),
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cidr: cidr,
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Routes: routes,
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routeTree: routeTree,
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l: l,
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rxPackets: make(chan []byte, 10),
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TxPackets: make(chan []byte, 10),
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}, nil
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}
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func newTunFromFd(_ *config.C, _ *logrus.Logger, _ int, _ netip.Prefix) (*TestTun, error) {
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return nil, fmt.Errorf("newTunFromFd not supported")
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}
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// Send will place a byte array onto the receive queue for nebula to consume
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// These are unencrypted ip layer frames destined for another nebula node.
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// packets should exit the udp side, capture them with udpConn.Get
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func (t *TestTun) Send(packet []byte) {
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if t.closed.Load() {
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return
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}
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if t.l.Level >= logrus.DebugLevel {
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t.l.WithField("dataLen", len(packet)).Debug("Tun receiving injected packet")
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}
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t.rxPackets <- packet
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}
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// Get will pull an unencrypted ip layer frame from the transmit queue
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// nebula meant to send this message to some application on the local system
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// packets were ingested from the udp side, you can send them with udpConn.Send
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func (t *TestTun) Get(block bool) []byte {
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if block {
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return <-t.TxPackets
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}
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select {
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case p := <-t.TxPackets:
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return p
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default:
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return nil
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}
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}
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//********************************************************************************************************************//
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// Below this is boilerplate implementation to make nebula actually work
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//********************************************************************************************************************//
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func (t *TestTun) RouteFor(ip netip.Addr) netip.Addr {
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r, _ := t.routeTree.Lookup(ip)
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return r
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}
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func (t *TestTun) Activate() error {
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return nil
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}
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func (t *TestTun) Cidr() netip.Prefix {
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return t.cidr
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}
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func (t *TestTun) Name() string {
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return t.Device
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}
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func (t *TestTun) Write(b []byte) (n int, err error) {
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if t.closed.Load() {
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return 0, io.ErrClosedPipe
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}
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packet := make([]byte, len(b), len(b))
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copy(packet, b)
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t.TxPackets <- packet
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return len(b), nil
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}
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func (t *TestTun) Close() error {
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if t.closed.CompareAndSwap(false, true) {
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close(t.rxPackets)
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close(t.TxPackets)
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}
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return nil
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}
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func (t *TestTun) Read(b []byte) (int, error) {
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p, ok := <-t.rxPackets
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if !ok {
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return 0, os.ErrClosed
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}
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copy(b, p)
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return len(p), nil
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}
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func (t *TestTun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
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return nil, fmt.Errorf("TODO: multiqueue not implemented")
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}
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