mirror of
https://github.com/gitpod-io/gitpod.git
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95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
// Copyright (c) 2020 TypeFox GmbH. All rights reserved.
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// Licensed under the GNU Affero General Public License (AGPL).
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// See License-AGPL.txt in the project root for license information.
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package cmd
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import (
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"fmt"
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"log"
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"net/http"
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"net/http/httputil"
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"net/url"
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"os"
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"strconv"
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"github.com/google/tcpproxy"
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"github.com/gorilla/handlers"
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"github.com/spf13/cobra"
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)
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var rewriteHostHeader bool
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var portFwdCmd = &cobra.Command{
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Use: "forward-port <local-port> [target-port]",
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Short: "Makes a port available on 0.0.0.0 so that it can be exposed to the internet",
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Long: ``,
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Args: cobra.RangeArgs(1, 2),
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Run: func(cmd *cobra.Command, args []string) {
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srcp, err := strconv.ParseInt(args[0], 10, 32)
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if err != nil {
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log.Fatalf("local-port cannot be parsed as int: %s", err)
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os.Exit(-1)
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return
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}
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if err := checkPortRange(srcp); err != nil {
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log.Fatalf("local-port: %s", err)
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os.Exit(-1)
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return
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}
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trgp := srcp + 1
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if len(args) > 1 {
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var err error
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trgp, err = strconv.ParseInt(args[1], 10, 32)
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if err != nil {
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log.Fatalf("target-port cannot be parsed as int: %s", err)
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os.Exit(-1)
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return
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}
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if err := checkPortRange(trgp); err != nil {
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log.Fatalf("target-port: %s", err)
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os.Exit(-1)
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return
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}
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}
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if rewriteHostHeader {
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remote, _ := url.Parse(fmt.Sprintf("http://localhost:%d", srcp))
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host := fmt.Sprintf("localhost:%d", srcp) // Spec: https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23
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proxy := httputil.NewSingleHostReverseProxy(remote)
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originalDirector := proxy.Director
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proxy.Director = func(r *http.Request) {
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originalDirector(r)
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r.Host = host
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}
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// we want both X-Forwarded-Proto AND X-Forwarded-Host to reach the backend
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http.Handle("/", handlers.ProxyHeaders(http.HandlerFunc(proxy.ServeHTTP)))
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fmt.Printf("Proxying HTTP traffic: 0.0.0.0:%d -> 127.0.0.1:%d (with host rewriting)\n", trgp, srcp)
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err = http.ListenAndServe(fmt.Sprintf(":%d", trgp), nil)
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if err != nil {
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log.Fatalf("reverse proxy: %s", err)
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}
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return
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}
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var p tcpproxy.Proxy
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p.AddRoute(fmt.Sprintf(":%d", trgp), tcpproxy.To(fmt.Sprintf("127.0.0.1:%d", srcp)))
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fmt.Printf("Forwarding traffic: 0.0.0.0:%d -> 127.0.0.1:%d\n", trgp, srcp)
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log.Fatal(p.Run())
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},
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}
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func checkPortRange(prt int64) error {
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if !(0 < prt && prt < 65535) {
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return fmt.Errorf("Port is not within range: 0 < %d < 65535", prt)
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}
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return nil
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}
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func init() {
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rootCmd.AddCommand(portFwdCmd)
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portFwdCmd.Flags().BoolVarP(&rewriteHostHeader, "rewrite-host-header", "r", false, "rewrites the host header of passing HTTP requests to localhost")
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}
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