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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-22 18:17:52 -05:00
v2fly/proxy/http/server.go
2017-02-21 22:15:20 +01:00

267 lines
7.1 KiB
Go

package http
import (
"bufio"
"context"
"io"
"net"
"net/http"
"runtime"
"strconv"
"strings"
"time"
"v2ray.com/core/app"
"v2ray.com/core/app/dispatcher"
"v2ray.com/core/app/log"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/errors"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/common/signal"
"v2ray.com/core/transport/internet"
)
// Server is a HTTP proxy server.
type Server struct {
config *ServerConfig
}
// NewServer creates a new HTTP inbound handler.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
space := app.SpaceFromContext(ctx)
if space == nil {
return nil, errors.New("HTTP|Server: No space in context.")
}
s := &Server{
config: config,
}
return s, nil
}
func (*Server) Network() v2net.NetworkList {
return v2net.NetworkList{
Network: []v2net.Network{v2net.Network_TCP},
}
}
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 v2net.Destination{}, err
}
} else {
intPort, err := strconv.Atoi(rawPort)
if err != nil {
return v2net.Destination{}, 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 (s *Server) Process(ctx context.Context, network v2net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
conn.SetReusable(false)
conn.SetReadDeadline(time.Now().Add(time.Second * 8))
reader := bufio.NewReaderSize(conn, 2048)
request, err := http.ReadRequest(reader)
if err != nil {
if errors.Cause(err) != io.EOF {
log.Warning("HTTP: Failed to read http request: ", err)
}
return err
}
log.Info("HTTP: Request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
conn.SetReadDeadline(time.Time{})
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("HTTP: Malformed proxy host (", host, "): ", err)
return err
}
log.Access(conn.RemoteAddr(), request.URL, log.AccessAccepted, "")
if strings.ToUpper(request.Method) == "CONNECT" {
return s.handleConnect(ctx, request, reader, conn, dest, dispatcher)
} else {
return s.handlePlainHTTP(ctx, request, reader, conn, dest, dispatcher)
}
}
func (s *Server) handleConnect(ctx context.Context, request *http.Request, reader io.Reader, writer io.Writer, dest v2net.Destination, dispatcher dispatcher.Interface) error {
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,
}
if err := response.Write(writer); err != nil {
return errors.Base(err).Message("HTTP|Server: Failed to write back OK response.")
}
ctx, cancel := context.WithCancel(ctx)
timeout := time.Second * time.Duration(s.config.Timeout)
if timeout == 0 {
timeout = time.Minute * 2
}
timer := signal.CancelAfterInactivity(ctx, cancel, timeout)
ray, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
requestDone := signal.ExecuteAsync(func() error {
defer ray.InboundInput().Close()
v2reader := buf.NewReader(reader)
if err := buf.PipeUntilEOF(timer, v2reader, ray.InboundInput()); err != nil {
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
v2writer := buf.NewWriter(writer)
if err := buf.PipeUntilEOF(timer, ray.InboundOutput(), v2writer); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
ray.InboundInput().CloseError()
ray.InboundOutput().CloseError()
return errors.Base(err).Message("HTTP|Server: Connection ends.")
}
runtime.KeepAlive(timer)
return nil
}
// @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 generateResponse(statusCode int, status string) *http.Response {
hdr := http.Header(make(map[string][]string))
hdr.Set("Connection", "close")
return &http.Response{
Status: status,
StatusCode: statusCode,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: hdr,
Body: nil,
ContentLength: 0,
Close: true,
}
}
func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, reader io.Reader, writer io.Writer, dest v2net.Destination, dispatcher dispatcher.Interface) error {
if len(request.URL.Host) <= 0 {
response := generateResponse(400, "Bad Request")
return response.Write(writer)
}
request.Host = request.URL.Host
StripHopByHopHeaders(request)
ray, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
input := ray.InboundInput()
output := ray.InboundOutput()
defer input.Close()
requestDone := signal.ExecuteAsync(func() error {
requestWriter := buf.NewBufferedWriter(buf.ToBytesWriter(ray.InboundInput()))
err := request.Write(requestWriter)
if err != nil {
return err
}
if err := requestWriter.Flush(); err != nil {
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
responseReader := bufio.NewReader(buf.ToBytesReader(ray.InboundOutput()))
response, err := http.ReadResponse(responseReader, request)
if err != nil {
log.Warning("HTTP: Failed to read response: ", err)
response = generateResponse(503, "Service Unavailable")
}
responseWriter := buf.NewBufferedWriter(writer)
if err := response.Write(responseWriter); err != nil {
return err
}
if err := responseWriter.Flush(); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
input.CloseError()
output.CloseError()
return errors.Base(err).Message("HTTP|Server: Connection ends.")
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}