110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
package tunneldns
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import (
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"net"
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"strconv"
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"sync"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/plugin/cache"
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"github.com/pkg/errors"
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"github.com/rs/zerolog"
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)
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const (
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LogFieldAddress = "address"
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LogFieldURL = "url"
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MaxUpstreamConnsDefault = 5
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)
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// Listener is an adapter between CoreDNS server and Warp runnable
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type Listener struct {
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server *dnsserver.Server
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wg sync.WaitGroup
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log *zerolog.Logger
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}
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// Create a CoreDNS server plugin from configuration
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func createConfig(address string, port uint16, p plugin.Handler) *dnsserver.Config {
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c := &dnsserver.Config{
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Zone: ".",
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Transport: "dns",
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ListenHosts: []string{address},
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Port: strconv.FormatUint(uint64(port), 10),
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}
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c.AddPlugin(func(next plugin.Handler) plugin.Handler { return p })
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return c
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}
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// Start blocks for serving requests
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func (l *Listener) Start(readySignal chan struct{}) error {
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defer close(readySignal)
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l.log.Info().Str(LogFieldAddress, l.server.Address()).Msg("Starting DNS over HTTPS proxy server")
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// Start UDP listener
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if udp, err := l.server.ListenPacket(); err == nil {
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l.wg.Add(1)
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go func() {
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_ = l.server.ServePacket(udp)
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l.wg.Done()
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}()
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} else {
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return errors.Wrap(err, "failed to create a UDP listener")
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}
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// Start TCP listener
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tcp, err := l.server.Listen()
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if err == nil {
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l.wg.Add(1)
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go func() {
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_ = l.server.Serve(tcp)
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l.wg.Done()
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}()
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}
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return errors.Wrap(err, "failed to create a TCP listener")
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}
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// Stop signals server shutdown and blocks until completed
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func (l *Listener) Stop() error {
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if err := l.server.Stop(); err != nil {
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return err
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}
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l.wg.Wait()
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return nil
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}
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// CreateListener configures the server and bound sockets
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func CreateListener(address string, port uint16, upstreams []string, bootstraps []string, maxUpstreamConnections int, log *zerolog.Logger) (*Listener, error) {
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// Build the list of upstreams
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upstreamList := make([]Upstream, 0)
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for _, url := range upstreams {
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log.Info().Str(LogFieldURL, url).Msg("Adding DNS upstream")
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upstream, err := NewUpstreamHTTPS(url, bootstraps, maxUpstreamConnections, log)
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if err != nil {
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return nil, errors.Wrap(err, "failed to create HTTPS upstream")
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}
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upstreamList = append(upstreamList, upstream)
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}
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// Create a local cache with HTTPS proxy plugin
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chain := cache.New()
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chain.Next = ProxyPlugin{
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Upstreams: upstreamList,
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}
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// Format an endpoint
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endpoint := "dns://" + net.JoinHostPort(address, strconv.FormatUint(uint64(port), 10))
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// Create the actual middleware server
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server, err := dnsserver.NewServer(endpoint, []*dnsserver.Config{createConfig(address, port, NewMetricsPlugin(chain))})
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if err != nil {
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return nil, err
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}
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return &Listener{server: server, log: log}, nil
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}
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