add sniffer for forwarding handler

handler/forward/remote/metadata.go

@@ -1,29 +1,57 @@
 package remote
 
 import (
+	"crypto"
+	"crypto/tls"
+	"crypto/x509"
 	"time"
 
+	"github.com/go-gost/core/bypass"
 	mdata "github.com/go-gost/core/metadata"
 	mdutil "github.com/go-gost/x/metadata/util"
+	"github.com/go-gost/x/registry"
 )
 
 type metadata struct {
-	readTimeout     time.Duration
+	readTimeout   time.Duration
+	proxyProtocol int
+
 	sniffing        bool
 	sniffingTimeout time.Duration
-	proxyProtocol   int
+	httpKeepalive   bool
+
+	certificate *x509.Certificate
+	privateKey  crypto.PrivateKey
+	alpn        string
+	mitmBypass  bypass.Bypass
 }
 
 func (h *forwardHandler) parseMetadata(md mdata.Metadata) (err error) {
-	const (
-		readTimeout   = "readTimeout"
-		sniffing      = "sniffing"
-		proxyProtocol = "proxyProtocol"
-	)
+	h.md.readTimeout = mdutil.GetDuration(md, "readTimeout")
+	if h.md.readTimeout <= 0 {
+		h.md.readTimeout = 15 * time.Second
+	}
+	h.md.proxyProtocol = mdutil.GetInt(md, "proxyProtocol")
 
-	h.md.readTimeout = mdutil.GetDuration(md, readTimeout)
-	h.md.sniffing = mdutil.GetBool(md, sniffing)
+	h.md.sniffing = mdutil.GetBool(md, "sniffing")
 	h.md.sniffingTimeout = mdutil.GetDuration(md, "sniffing.timeout")
-	h.md.proxyProtocol = mdutil.GetInt(md, proxyProtocol)
+
+	h.md.httpKeepalive = mdutil.GetBool(md, "http.keepalive")
+
+	certFile := mdutil.GetString(md, "mitm.certFile", "mitm.caCertFile")
+	keyFile := mdutil.GetString(md, "mitm.keyFile", "mitm.caKeyFile")
+	if certFile != "" && keyFile != "" {
+		tlsCert, err := tls.LoadX509KeyPair(certFile, keyFile)
+		if err != nil {
+			return err
+		}
+		h.md.certificate, err = x509.ParseCertificate(tlsCert.Certificate[0])
+		if err != nil {
+			return err
+		}
+		h.md.privateKey = tlsCert.PrivateKey
+	}
+	h.md.alpn = mdutil.GetString(md, "mitm.alpn")
+	h.md.mitmBypass = registry.BypassRegistry().Get(mdutil.GetString(md, "mitm.bypass"))
 	return
 }