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https proxy in golang
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// https://medium.com/@mlowicki/http-s-proxy-in-golang-in-less-than-100-lines-of-code-6a51c2f2c38c | |
// #!/usr/bin/env bash | |
// case `uname -s` in | |
// Linux*) sslConfig=/etc/ssl/openssl.cnf;; | |
// Darwin*) sslConfig=/System/Library/OpenSSL/openssl.cnf;; | |
// esac | |
// openssl req \ | |
// -newkey rsa:2048 \ | |
// -x509 \ | |
// -nodes \ | |
// -keyout server.key \ | |
// -new \ | |
// -out server.pem \ | |
// -subj /CN=localhost \ | |
// -reqexts SAN \ | |
// -extensions SAN \ | |
// -config <(cat $sslConfig \ | |
// <(printf '[SAN]\nsubjectAltName=DNS:localhost')) \ | |
// -sha256 \ | |
// -days 3650 | |
package main | |
import ( | |
"crypto/tls" | |
"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.pem", "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)) | |
} | |
} |
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