fproxy/medium/sample.go

90 lines
2.0 KiB
Go

package main
import (
"flag"
"io"
"log"
"net"
"net/http"
"time"
)
func handleTunneling(w http.ResponseWriter, r *http.Request) {
dest_conn, err := net.DialTimeout("tcp", r.Host, 10*time.Second)
if err != nil {
http.Error(w, err.Error(), http.StatusServiceUnavailable)
return
}
w.WriteHeader(http.StatusOK)
hijacker, ok := w.(http.Hijacker)
if !ok {
http.Error(w, "Hijacking not supported", http.StatusInternalServerError)
return
}
client_conn, _, err := hijacker.Hijack()
if err != nil {
http.Error(w, err.Error(), http.StatusServiceUnavailable)
}
go transfer(dest_conn, client_conn)
go transfer(client_conn, dest_conn)
}
func transfer(destination io.WriteCloser, source io.ReadCloser) {
defer destination.Close()
defer source.Close()
io.Copy(destination, source)
}
func handleHTTP(w http.ResponseWriter, req *http.Request) {
resp, err := http.DefaultTransport.RoundTrip(req)
if err != nil {
http.Error(w, err.Error(), http.StatusServiceUnavailable)
return
}
defer resp.Body.Close()
copyHeader(w.Header(), resp.Header)
w.WriteHeader(resp.StatusCode)
io.Copy(w, resp.Body)
}
func copyHeader(dst, src http.Header) {
for k, vv := range src {
for _, v := range vv {
dst.Add(k, v)
}
}
}
func main() {
var pemPath string
flag.StringVar(&pemPath, "pem", "server.crt", "path to pem file")
var keyPath string
flag.StringVar(&keyPath, "key", "server.key", "path to key file")
var proto string
flag.StringVar(&proto, "proto", "https", "Proxy protocol (http or https)")
flag.Parse()
if proto != "http" && proto != "https" {
log.Fatal("Protocol must be either http or https")
}
server := &http.Server{
Addr: ":8888",
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodConnect {
handleTunneling(w, r)
} else {
handleHTTP(w, r)
}
}),
// Disable HTTP/2.
//TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler)),
}
if proto == "http" {
log.Fatal(server.ListenAndServe())
} else {
log.Fatal(server.ListenAndServeTLS(pemPath, keyPath))
}
}