tailscale/derp/derphttp/derphttp_server.go
Will Norris 71029cea2d all: update copyright and license headers
This updates all source files to use a new standard header for copyright
and license declaration.  Notably, copyright no longer includes a date,
and we now use the standard SPDX-License-Identifier header.

This commit was done almost entirely mechanically with perl, and then
some minimal manual fixes.

Updates #6865

Signed-off-by: Will Norris <will@tailscale.com>
2023-01-27 15:36:29 -08:00

61 lines
1.5 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package derphttp
import (
"fmt"
"log"
"net/http"
"strings"
"tailscale.com/derp"
)
// fastStartHeader is the header (with value "1") that signals to the HTTP
// server that the DERP HTTP client does not want the HTTP 101 response
// headers and it will begin writing & reading the DERP protocol immediately
// following its HTTP request.
const fastStartHeader = "Derp-Fast-Start"
func Handler(s *derp.Server) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
up := strings.ToLower(r.Header.Get("Upgrade"))
if up != "websocket" && up != "derp" {
if up != "" {
log.Printf("Weird upgrade: %q", up)
}
http.Error(w, "DERP requires connection upgrade", http.StatusUpgradeRequired)
return
}
fastStart := r.Header.Get(fastStartHeader) == "1"
h, ok := w.(http.Hijacker)
if !ok {
http.Error(w, "HTTP does not support general TCP support", 500)
return
}
netConn, conn, err := h.Hijack()
if err != nil {
log.Printf("Hijack failed: %v", err)
http.Error(w, "HTTP does not support general TCP support", 500)
return
}
if !fastStart {
pubKey := s.PublicKey()
fmt.Fprintf(conn, "HTTP/1.1 101 Switching Protocols\r\n"+
"Upgrade: DERP\r\n"+
"Connection: Upgrade\r\n"+
"Derp-Version: %v\r\n"+
"Derp-Public-Key: %s\r\n\r\n",
derp.ProtocolVersion,
pubKey.UntypedHexString())
}
s.Accept(r.Context(), netConn, conn, netConn.RemoteAddr().String())
})
}