Run like:
# run server
go run main.goIn another terminal:
$ export DOCKER_HOST=tcp://localhost:8080
# run whatever docker commands:
$ docker ps
$ docker build .And you'll see all the traffic in the other terminal window.
Last active
August 17, 2024 14:16
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proxy docker over tcp and print all request bytes
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| package main | |
| import ( | |
| "fmt" | |
| "log" | |
| "net" | |
| "net/http" | |
| "net/http/httputil" | |
| "net/url" | |
| "time" | |
| ) | |
| type unixDialer struct { | |
| net.Dialer | |
| } | |
| // overriding net.Dialer.Dial to force unix socket connection | |
| func (d *unixDialer) Dial(network, address string) (net.Conn, error) { | |
| return d.Dialer.Dial("unix", "/var/run/docker.sock") | |
| } | |
| type loggingListener struct { | |
| net.Listener | |
| } | |
| func (l *loggingListener) Accept() (net.Conn, error) { | |
| conn, err := l.Listener.Accept() | |
| if err != nil { | |
| return nil, err | |
| } | |
| return &loggingConn{Conn: conn}, nil | |
| } | |
| type loggingConn struct { | |
| net.Conn | |
| } | |
| func (c *loggingConn) Read(b []byte) (int, error) { | |
| n, err := c.Conn.Read(b) | |
| if err != nil { | |
| return n, err | |
| } | |
| fmt.Printf("Read %d bytes: %s\n", n, string(b[:n])) | |
| return n, err | |
| } | |
| func (c *loggingConn) Write(b []byte) (int, error) { | |
| n, err := c.Conn.Write(b) | |
| if err != nil { | |
| return n, err | |
| } | |
| fmt.Printf("Wrote %d bytes: %s\n", n, string(b[:n])) | |
| return n, err | |
| } | |
| func main() { | |
| u, err := url.Parse("http://docker") | |
| if err != nil { | |
| log.Panicln(err) | |
| } | |
| proxy := httputil.NewSingleHostReverseProxy(u) | |
| proxy.Transport = &http.Transport{ | |
| Proxy: http.ProxyFromEnvironment, | |
| Dial: (&unixDialer{net.Dialer{ | |
| Timeout: 30 * time.Second, | |
| KeepAlive: 30 * time.Second, | |
| }, | |
| }).Dial, | |
| TLSHandshakeTimeout: 10 * time.Second, | |
| } | |
| listener, err := net.Listen("tcp", ":8080") | |
| if err != nil { | |
| log.Panicln(err) | |
| } | |
| loggingListener := &loggingListener{Listener: listener} | |
| http.Serve(loggingListener, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
| fmt.Println(r) | |
| proxy.ServeHTTP(w, r) | |
| })) | |
| } |
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