feat: complete basic functions

Support http,dns and mysql connection. Support custom http, dns response. Support dns rebinding.
Support mysql load local files and jdbc deserialize exploit.

pkg/mysql/vmysql/auth_server_none.go

@@ -0,0 +1,64 @@
+/*
+Copyright 2017 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreedto in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package vmysql
+
+import (
+    "net"
+
+    querypb "vitess.io/vitess/go/vt/proto/query"
+)
+
+// AuthServerNone takes all comers.
+// It's meant to be used for testing and prototyping.
+// With this config, you can connect to a local vtgate using
+// the following command line: 'mysql -P port -h ::'.
+// It only uses MysqlNativePassword method.
+type AuthServerNone struct{}
+
+// AuthMethod is part of the AuthServer interface.
+// We always return MysqlNativePassword.
+func (a *AuthServerNone) AuthMethod(user string) (string, error) {
+    return MysqlNativePassword, nil
+}
+
+// Salt makes salt
+func (a *AuthServerNone) Salt() ([]byte, error) {
+    return NewSalt()
+}
+
+// ValidateHash validates hash
+func (a *AuthServerNone) ValidateHash(salt []byte, user string, authResponse []byte, remoteAddr net.Addr) (Getter, error) {
+    return &NoneGetter{}, nil
+}
+
+// Negotiate is part of the AuthServer interface.
+// It will never be called.
+func (a *AuthServerNone) Negotiate(c *Conn, user string, remotAddr net.Addr) (Getter, error) {
+    panic("Negotiate should not be called as AuthMethod returned mysql_native_password")
+}
+
+func init() {
+    RegisterAuthServerImpl("none", &AuthServerNone{})
+}
+
+// NoneGetter holds the empty string
+type NoneGetter struct{}
+
+// Get returns the empty string
+func (ng *NoneGetter) Get() *querypb.VTGateCallerID {
+    return &querypb.VTGateCallerID{Username: "userData1"}
+}