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v2fly/proxy/http/server.go

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package http
import (
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"bufio"
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"crypto/tls"
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"io"
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"net"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"github.com/v2ray/v2ray-core/app"
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"github.com/v2ray/v2ray-core/app/dispatcher"
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"github.com/v2ray/v2ray-core/common/alloc"
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v2io "github.com/v2ray/v2ray-core/common/io"
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"github.com/v2ray/v2ray-core/common/log"
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v2net "github.com/v2ray/v2ray-core/common/net"
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"github.com/v2ray/v2ray-core/proxy"
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"github.com/v2ray/v2ray-core/proxy/internal"
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"github.com/v2ray/v2ray-core/transport/hub"
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"github.com/v2ray/v2ray-core/transport/ray"
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)
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// Server is a HTTP proxy server.
type Server struct {
sync.Mutex
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accepting bool
packetDispatcher dispatcher.PacketDispatcher
config *Config
tcpListener *hub.TCPHub
listeningPort v2net.Port
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listeningAddress v2net.Address
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}
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func NewServer(config *Config, packetDispatcher dispatcher.PacketDispatcher) *Server {
return &Server{
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packetDispatcher: packetDispatcher,
config: config,
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}
}
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func (this *Server) Port() v2net.Port {
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return this.listeningPort
}
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func (this *Server) Close() {
this.accepting = false
if this.tcpListener != nil {
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this.Lock()
this.tcpListener.Close()
this.tcpListener = nil
this.Unlock()
}
}
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func (this *Server) Listen(address v2net.Address, port v2net.Port) error {
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if this.accepting {
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if this.listeningPort == port && this.listeningAddress.Equals(address) {
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return nil
} else {
return proxy.ErrorAlreadyListening
}
}
this.listeningPort = port
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this.listeningAddress = address
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var tlsConfig *tls.Config
if this.config.TLSConfig != nil {
tlsConfig = this.config.TLSConfig.GetConfig()
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}
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tcpListener, err := hub.ListenTCP(address, port, this.handleConnection, tlsConfig)
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if err != nil {
log.Error("Http: Failed listen on port ", port, ": ", err)
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return err
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}
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this.Lock()
this.tcpListener = tcpListener
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this.Unlock()
this.accepting = true
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return nil
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}
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func parseHost(rawHost string, defaultPort v2net.Port) (v2net.Destination, error) {
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port := defaultPort
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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
}
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} else {
intPort, err := strconv.Atoi(rawPort)
if err != nil {
return nil, err
}
port = v2net.Port(intPort)
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}
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if ip := net.ParseIP(host); ip != nil {
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return v2net.TCPDestination(v2net.IPAddress(ip), port), nil
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}
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return v2net.TCPDestination(v2net.DomainAddress(host), port), nil
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}
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func (this *Server) handleConnection(conn *hub.Connection) {
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defer conn.Close()
reader := bufio.NewReader(conn)
request, err := http.ReadRequest(reader)
if err != nil {
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log.Warning("Failed to read http request: ", err)
return
}
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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 {
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log.Warning("Malformed proxy host (", host, "): ", err)
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return
}
if strings.ToUpper(request.Method) == "CONNECT" {
this.handleConnect(request, dest, reader, conn)
} else {
this.handlePlainHTTP(request, dest, reader, conn)
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}
}
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func (this *Server) handleConnect(request *http.Request, destination v2net.Destination, reader io.Reader, writer io.Writer) {
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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,
}
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buffer := alloc.NewSmallBuffer().Clear()
response.Write(buffer)
writer.Write(buffer.Value)
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buffer.Release()
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ray := this.packetDispatcher.DispatchToOutbound(destination)
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this.transport(reader, writer, ray)
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}
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func (this *Server) transport(input io.Reader, output io.Writer, ray ray.InboundRay) {
var wg sync.WaitGroup
wg.Add(2)
defer wg.Wait()
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go func() {
v2reader := v2io.NewAdaptiveReader(input)
defer v2reader.Release()
v2io.Pipe(v2reader, ray.InboundInput())
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ray.InboundInput().Close()
wg.Done()
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}()
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go func() {
v2writer := v2io.NewAdaptiveWriter(output)
defer v2writer.Release()
v2io.Pipe(ray.InboundOutput(), v2writer)
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ray.InboundOutput().Release()
wg.Done()
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}()
}
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// @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))
}
}
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func (this *Server) 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
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StripHopByHopHeaders(request)
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ray := this.packetDispatcher.DispatchToOutbound(dest)
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defer ray.InboundInput().Close()
defer ray.InboundOutput().Release()
var finish sync.WaitGroup
finish.Add(1)
go func() {
defer finish.Done()
requestWriter := v2io.NewBufferedWriter(v2io.NewChainWriter(ray.InboundInput()))
err := request.Write(requestWriter)
if err != nil {
log.Warning("HTTP: Failed to write request: ", err)
return
}
requestWriter.Flush()
}()
finish.Add(1)
go func() {
defer finish.Done()
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responseReader := bufio.NewReader(v2io.NewChanReader(ray.InboundOutput()))
response, err := http.ReadResponse(responseReader, request)
if err != nil {
log.Warning("HTTP: Failed to read response: ", err)
return
}
responseWriter := v2io.NewBufferedWriter(writer)
err = response.Write(responseWriter)
if err != nil {
log.Warning("HTTP: Failed to write response: ", err)
return
}
responseWriter.Flush()
}()
finish.Wait()
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}
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func init() {
internal.MustRegisterInboundHandlerCreator("http",
func(space app.Space, rawConfig interface{}) (proxy.InboundHandler, error) {
if !space.HasApp(dispatcher.APP_ID) {
return nil, internal.ErrorBadConfiguration
}
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return NewServer(
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rawConfig.(*Config),
space.GetApp(dispatcher.APP_ID).(dispatcher.PacketDispatcher)), nil
})
}