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main.go
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main.go
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// Copyright 2020 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"crypto/tls"
"fmt"
"io"
"log"
"net/http"
"os"
"regexp"
"strings"
"github.com/gorilla/handlers"
"github.com/netsec-ethz/scion-apps/pkg/shttp"
)
var (
mungedScionAddr = regexp.MustCompile(`^(\d+)-([_\dA-Fa-f]+)-(.*)$`)
)
const (
mungedScionAddrIAIndex = 1
mungedScionAddrASIndex = 2
mungedScionAddrHostIndex = 3
)
func main() {
transport := shttp.NewRoundTripper(&tls.Config{InsecureSkipVerify: true}, nil)
defer transport.Close()
proxy := &ProxyHandler{
Transport: transport,
}
server := &http.Server{
Addr: "localhost:8888",
Handler: handlers.LoggingHandler(os.Stdout, proxy),
}
log.Fatal(server.ListenAndServe())
}
type ProxyHandler struct {
Transport http.RoundTripper
}
func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
req.Host = demunge(req.Host)
req.URL.Scheme = "https"
req.URL.Host = req.Host
resp, err := h.Transport.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)
}
}
}
// demunge reverts the host name to a proper SCION address, from the format
// that had been entered in the browser.
func demunge(host string) string {
parts := mungedScionAddr.FindStringSubmatch(host)
if parts != nil {
// directly apply mangling as inMangleSCIONAddr
return fmt.Sprintf("[%s-%s,%s]",
parts[mungedScionAddrIAIndex],
strings.ReplaceAll(parts[mungedScionAddrASIndex], "_", ":"),
parts[mungedScionAddrHostIndex],
)
} else {
return strings.TrimSuffix(host, ".scion")
}
}