115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
package proxydns
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import (
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"net"
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"os"
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"os/signal"
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"syscall"
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"github.com/urfave/cli/v2"
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"github.com/cloudflare/cloudflared/cmd/cloudflared/cliutil"
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"github.com/cloudflare/cloudflared/logger"
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"github.com/cloudflare/cloudflared/metrics"
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"github.com/cloudflare/cloudflared/tunneldns"
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)
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func Command(hidden bool) *cli.Command {
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return &cli.Command{
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Name: "proxy-dns",
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Action: cliutil.ConfiguredAction(Run),
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Usage: "Run a DNS over HTTPS proxy server.",
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Flags: []cli.Flag{
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&cli.StringFlag{
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Name: "metrics",
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Value: "localhost:",
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Usage: "Listen address for metrics reporting.",
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EnvVars: []string{"TUNNEL_METRICS"},
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},
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&cli.StringFlag{
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Name: "address",
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Usage: "Listen address for the DNS over HTTPS proxy server.",
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Value: "localhost",
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EnvVars: []string{"TUNNEL_DNS_ADDRESS"},
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},
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// Note TUN-3758 , we use Int because UInt is not supported with altsrc
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&cli.IntFlag{
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Name: "port",
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Usage: "Listen on given port for the DNS over HTTPS proxy server.",
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Value: 53,
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EnvVars: []string{"TUNNEL_DNS_PORT"},
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},
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&cli.StringSliceFlag{
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Name: "upstream",
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Usage: "Upstream endpoint URL, you can specify multiple endpoints for redundancy.",
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Value: cli.NewStringSlice("https://1.1.1.1/dns-query", "https://1.0.0.1/dns-query"),
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EnvVars: []string{"TUNNEL_DNS_UPSTREAM"},
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},
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&cli.StringSliceFlag{
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Name: "bootstrap",
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Usage: "bootstrap endpoint URL, you can specify multiple endpoints for redundancy.",
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Value: cli.NewStringSlice("https://162.159.36.1/dns-query", "https://162.159.46.1/dns-query", "https://[2606:4700:4700::1111]/dns-query", "https://[2606:4700:4700::1001]/dns-query"),
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EnvVars: []string{"TUNNEL_DNS_BOOTSTRAP"},
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},
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&cli.IntFlag{
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Name: "max-upstream-conns",
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Usage: "Maximum concurrent connections to upstream. Setting to 0 means unlimited.",
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Value: tunneldns.MaxUpstreamConnsDefault,
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EnvVars: []string{"TUNNEL_DNS_MAX_UPSTREAM_CONNS"},
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},
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},
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ArgsUsage: " ", // can't be the empty string or we get the default output
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Hidden: hidden,
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}
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}
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// Run implements a foreground runner
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func Run(c *cli.Context) error {
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log := logger.CreateLoggerFromContext(c, logger.EnableTerminalLog)
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metricsListener, err := net.Listen("tcp", c.String("metrics"))
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if err != nil {
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log.Fatal().Err(err).Msg("Failed to open the metrics listener")
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}
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go metrics.ServeMetrics(metricsListener, nil, nil, "", log)
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listener, err := tunneldns.CreateListener(
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c.String("address"),
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// Note TUN-3758 , we use Int because UInt is not supported with altsrc
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uint16(c.Int("port")),
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c.StringSlice("upstream"),
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c.StringSlice("bootstrap"),
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c.Int("max-upstream-conns"),
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log,
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)
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if err != nil {
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log.Err(err).Msg("Failed to create the listeners")
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return err
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}
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// Try to start the server
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readySignal := make(chan struct{})
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err = listener.Start(readySignal)
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if err != nil {
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log.Err(err).Msg("Failed to start the listeners")
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return listener.Stop()
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}
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<-readySignal
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// Wait for signal
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signals := make(chan os.Signal, 10)
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signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT)
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defer signal.Stop(signals)
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<-signals
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// Shut down server
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err = listener.Stop()
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if err != nil {
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log.Err(err).Msg("failed to stop")
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}
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return err
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}
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