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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-06 10:16:40 -05:00
v2fly/proxy/http/http.go
2016-04-18 18:44:10 +02:00

245 lines
6.3 KiB
Go

package http
import (
"bufio"
"io"
"net"
"net/http"
"strconv"
"strings"
"sync"
"github.com/v2ray/v2ray-core/app/dispatcher"
"github.com/v2ray/v2ray-core/common/alloc"
v2io "github.com/v2ray/v2ray-core/common/io"
"github.com/v2ray/v2ray-core/common/log"
v2net "github.com/v2ray/v2ray-core/common/net"
"github.com/v2ray/v2ray-core/common/serial"
"github.com/v2ray/v2ray-core/proxy"
"github.com/v2ray/v2ray-core/transport/hub"
"github.com/v2ray/v2ray-core/transport/ray"
)
type HttpProxyServer struct {
sync.Mutex
accepting bool
packetDispatcher dispatcher.PacketDispatcher
config *Config
tcpListener *hub.TCPHub
listeningPort v2net.Port
}
func NewHttpProxyServer(config *Config, packetDispatcher dispatcher.PacketDispatcher) *HttpProxyServer {
return &HttpProxyServer{
packetDispatcher: packetDispatcher,
config: config,
}
}
func (this *HttpProxyServer) Port() v2net.Port {
return this.listeningPort
}
func (this *HttpProxyServer) Close() {
this.accepting = false
if this.tcpListener != nil {
this.Lock()
this.tcpListener.Close()
this.tcpListener = nil
this.Unlock()
}
}
func (this *HttpProxyServer) Listen(port v2net.Port) error {
if this.accepting {
if this.listeningPort == port {
return nil
} else {
return proxy.ErrorAlreadyListening
}
}
this.listeningPort = port
tcpListener, err := hub.ListenTCP(port, this.handleConnection)
if err != nil {
log.Error("Http: Failed listen on port ", port, ": ", err)
return err
}
this.Lock()
this.tcpListener = tcpListener
this.Unlock()
this.accepting = true
return nil
}
func parseHost(rawHost string, defaultPort v2net.Port) (v2net.Destination, error) {
port := defaultPort
host, rawPort, err := net.SplitHostPort(rawHost)
if err != nil {
if addrError, ok := err.(*net.AddrError); ok && strings.Contains(addrError.Err, "missing port") {
host = rawHost
} else {
return nil, err
}
} else {
intPort, err := strconv.Atoi(rawPort)
if err != nil {
return nil, err
}
port = v2net.Port(intPort)
}
if ip := net.ParseIP(host); ip != nil {
return v2net.TCPDestination(v2net.IPAddress(ip), port), nil
}
return v2net.TCPDestination(v2net.DomainAddress(host), port), nil
}
func (this *HttpProxyServer) handleConnection(conn *hub.TCPConn) {
defer conn.Close()
reader := bufio.NewReader(conn)
request, err := http.ReadRequest(reader)
if err != nil {
log.Warning("Failed to read http request: ", err)
return
}
log.Info("Request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
defaultPort := v2net.Port(80)
if strings.ToLower(request.URL.Scheme) == "https" {
defaultPort = v2net.Port(443)
}
host := request.Host
if len(host) == 0 {
host = request.URL.Host
}
dest, err := parseHost(host, defaultPort)
if err != nil {
log.Warning("Malformed proxy host (", host, "): ", err)
return
}
if strings.ToUpper(request.Method) == "CONNECT" {
this.handleConnect(request, dest, reader, conn)
} else {
this.handlePlainHTTP(request, dest, reader, conn)
}
}
func (this *HttpProxyServer) handleConnect(request *http.Request, destination v2net.Destination, reader io.Reader, writer io.Writer) {
response := &http.Response{
Status: "200 OK",
StatusCode: 200,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header(make(map[string][]string)),
Body: nil,
ContentLength: 0,
Close: false,
}
buffer := alloc.NewSmallBuffer().Clear()
response.Write(buffer)
writer.Write(buffer.Value)
buffer.Release()
packet := v2net.NewPacket(destination, nil, true)
ray := this.packetDispatcher.DispatchToOutbound(packet)
this.transport(reader, writer, ray)
}
func (this *HttpProxyServer) transport(input io.Reader, output io.Writer, ray ray.InboundRay) {
var wg sync.WaitGroup
wg.Add(2)
defer wg.Wait()
go func() {
v2io.Pipe(v2io.NewAdaptiveReader(input), ray.InboundInput())
ray.InboundInput().Close()
wg.Done()
}()
go func() {
v2io.Pipe(ray.InboundOutput(), v2io.NewAdaptiveWriter(output))
ray.InboundOutput().Release()
wg.Done()
}()
}
// @VisibleForTesting
func StripHopByHopHeaders(request *http.Request) {
// Strip hop-by-hop header basaed on RFC:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
// https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
request.Header.Del("Proxy-Connection")
request.Header.Del("Proxy-Authenticate")
request.Header.Del("Proxy-Authorization")
request.Header.Del("TE")
request.Header.Del("Trailers")
request.Header.Del("Transfer-Encoding")
request.Header.Del("Upgrade")
// TODO: support keep-alive
connections := request.Header.Get("Connection")
request.Header.Set("Connection", "close")
if len(connections) == 0 {
return
}
for _, h := range strings.Split(connections, ",") {
request.Header.Del(strings.TrimSpace(h))
}
}
func (this *HttpProxyServer) handlePlainHTTP(request *http.Request, dest v2net.Destination, reader *bufio.Reader, writer io.Writer) {
if len(request.URL.Host) <= 0 {
hdr := http.Header(make(map[string][]string))
hdr.Set("Connection", "close")
response := &http.Response{
Status: "400 Bad Request",
StatusCode: 400,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: hdr,
Body: nil,
ContentLength: 0,
Close: false,
}
buffer := alloc.NewSmallBuffer().Clear()
response.Write(buffer)
writer.Write(buffer.Value)
buffer.Release()
return
}
request.Host = request.URL.Host
StripHopByHopHeaders(request)
requestBuffer := alloc.NewBuffer().Clear() // Don't release this buffer as it is passed into a Packet.
request.Write(requestBuffer)
log.Debug("Request to remote:\n", serial.BytesLiteral(requestBuffer.Value))
packet := v2net.NewPacket(dest, requestBuffer, true)
ray := this.packetDispatcher.DispatchToOutbound(packet)
defer ray.InboundInput().Close()
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
responseReader := bufio.NewReader(NewChanReader(ray.InboundOutput()))
response, err := http.ReadResponse(responseReader, request)
if err != nil {
return
}
responseBuffer := alloc.NewBuffer().Clear()
defer responseBuffer.Release()
response.Write(responseBuffer)
writer.Write(responseBuffer.Value)
response.Body.Close()
}()
wg.Wait()
}