initial commit

server/handler/http/handler.go

@@ -0,0 +1,233 @@
+package http
+
+import (
+	"bufio"
+	"context"
+	"net"
+	"net/http"
+
+	"github.com/go-gost/gost/logger"
+	"github.com/go-gost/gost/server/handler"
+)
+
+var (
+	_ handler.Handler = (*Handler)(nil)
+)
+
+type Handler struct {
+	logger logger.Logger
+	md     metadata
+}
+
+func NewHandler(opts ...handler.Option) *Handler {
+	options := &handler.Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &Handler{
+		logger: options.Logger,
+	}
+}
+
+func (h *Handler) Init(md handler.Metadata) error {
+	return nil
+}
+
+func (h *Handler) Handle(ctx context.Context, conn net.Conn) {
+	defer conn.Close()
+
+	req, err := http.ReadRequest(bufio.NewReader(conn))
+	if err != nil {
+		h.logger.WithFields(map[string]interface{}{
+			"src":   conn.RemoteAddr(),
+			"local": conn.LocalAddr(),
+		}).Error(err)
+		return
+	}
+	defer req.Body.Close()
+
+	h.handleRequest(conn, req)
+}
+
+func (h *Handler) handleRequest(conn net.Conn, req *http.Request) {
+	if req == nil {
+		return
+	}
+
+	/*
+		// try to get the actual host.
+		if v := req.Header.Get("Gost-Target"); v != "" {
+			if h, err := decodeServerName(v); err == nil {
+				req.Host = h
+			}
+		}
+	*/
+
+	host := req.Host
+	if _, port, _ := net.SplitHostPort(host); port == "" {
+		host = net.JoinHostPort(host, "80")
+	}
+
+	/*
+		u, _, _ := basicProxyAuth(req.Header.Get("Proxy-Authorization"))
+		if u != "" {
+			u += "@"
+		}
+		log.Logf("[http] %s%s -> %s -> %s",
+			u, conn.RemoteAddr(), h.options.Node.String(), host)
+
+		if Debug {
+			dump, _ := httputil.DumpRequest(req, false)
+			log.Logf("[http] %s -> %s\n%s", conn.RemoteAddr(), conn.LocalAddr(), string(dump))
+		}
+
+		req.Header.Del("Gost-Target")
+	*/
+	resp := &http.Response{
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		Header:     http.Header{},
+	}
+	resp.Header.Add("Proxy-Agent", h.md.proxyAgent)
+
+	/*
+		if !Can("tcp", host, h.options.Whitelist, h.options.Blacklist) {
+			log.Logf("[http] %s - %s : Unauthorized to tcp connect to %s",
+				conn.RemoteAddr(), conn.LocalAddr(), host)
+			resp.StatusCode = http.StatusForbidden
+
+			if Debug {
+				dump, _ := httputil.DumpResponse(resp, false)
+				log.Logf("[http] %s <- %s\n%s", conn.RemoteAddr(), conn.LocalAddr(), string(dump))
+			}
+
+			resp.Write(conn)
+			return
+		}
+	*/
+
+	/*
+		if h.options.Bypass.Contains(host) {
+			resp.StatusCode = http.StatusForbidden
+
+			log.Logf("[http] %s - %s bypass %s",
+				conn.RemoteAddr(), conn.LocalAddr(), host)
+			if Debug {
+				dump, _ := httputil.DumpResponse(resp, false)
+				log.Logf("[http] %s <- %s\n%s", conn.RemoteAddr(), conn.LocalAddr(), string(dump))
+			}
+
+			resp.Write(conn)
+			return
+		}
+	*/
+
+	/*
+		if !h.authenticate(conn, req, resp) {
+			return
+		}
+	*/
+
+	if req.Method == "PRI" ||
+		(req.Method != http.MethodConnect && req.URL.Scheme != "http") {
+		resp.StatusCode = http.StatusBadRequest
+		/*
+			if Debug {
+				dump, _ := httputil.DumpResponse(resp, false)
+				log.Logf("[http] %s <- %s\n%s",
+					conn.RemoteAddr(), conn.LocalAddr(), string(dump))
+			}
+		*/
+
+		resp.Write(conn)
+		return
+	}
+
+	req.Header.Del("Proxy-Authorization")
+
+	/*
+		retries := 1
+		if h.options.Chain != nil && h.options.Chain.Retries > 0 {
+			retries = h.options.Chain.Retries
+		}
+		if h.options.Retries > 0 {
+			retries = h.options.Retries
+		}
+
+		var err error
+		var cc net.Conn
+		var route *Chain
+		for i := 0; i < retries; i++ {
+			route, err = h.options.Chain.selectRouteFor(host)
+			if err != nil {
+				log.Logf("[http] %s -> %s : %s",
+					conn.RemoteAddr(), conn.LocalAddr(), err)
+				continue
+			}
+
+			buf := bytes.Buffer{}
+			fmt.Fprintf(&buf, "%s -> %s -> ",
+				conn.RemoteAddr(), h.options.Node.String())
+			for _, nd := range route.route {
+				fmt.Fprintf(&buf, "%d@%s -> ", nd.ID, nd.String())
+			}
+			fmt.Fprintf(&buf, "%s", host)
+			log.Log("[route]", buf.String())
+
+			// forward http request
+			lastNode := route.LastNode()
+			if req.Method != http.MethodConnect && lastNode.Protocol == "http" {
+				err = h.forwardRequest(conn, req, route)
+				if err == nil {
+					return
+				}
+				log.Logf("[http] %s -> %s : %s", conn.RemoteAddr(), conn.LocalAddr(), err)
+				continue
+			}
+
+			cc, err = route.Dial(host,
+				TimeoutChainOption(h.options.Timeout),
+				HostsChainOption(h.options.Hosts),
+				ResolverChainOption(h.options.Resolver),
+			)
+			if err == nil {
+				break
+			}
+			log.Logf("[http] %s -> %s : %s", conn.RemoteAddr(), conn.LocalAddr(), err)
+		}
+
+		if err != nil {
+			resp.StatusCode = http.StatusServiceUnavailable
+
+			if Debug {
+				dump, _ := httputil.DumpResponse(resp, false)
+				log.Logf("[http] %s <- %s\n%s", conn.RemoteAddr(), conn.LocalAddr(), string(dump))
+			}
+
+			resp.Write(conn)
+			return
+		}
+	*/
+	cc, err := net.Dial("tcp", host)
+	if err != nil {
+		resp.StatusCode = http.StatusServiceUnavailable
+		resp.Write(conn)
+		return
+	}
+	defer cc.Close()
+
+	if req.Method == http.MethodConnect {
+		b := []byte("HTTP/1.1 200 Connection established\r\n" +
+			"Proxy-Agent: " + h.md.proxyAgent + "\r\n\r\n")
+		conn.Write(b)
+	} else {
+		req.Header.Del("Proxy-Connection")
+
+		if err = req.Write(cc); err != nil {
+			return
+		}
+	}
+
+	handler.Transport(conn, cc)
+}