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/sql_error.go

@@ -0,0 +1,74 @@
+/*
+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 agreed to 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 (
+    "bytes"
+    "fmt"
+
+    "vitess.io/vitess/go/vt/sqlparser"
+)
+
+// SQLError is the error structure returned from calling a db library function
+type SQLError struct {
+    Num     int
+    State   string
+    Message string
+    Query   string
+}
+
+// NewSQLError creates a new SQLError.
+// If sqlState is left empty, it will default to "HY000" (general error).
+// TODO: Should be aligned with vterrors, stack traces and wrapping
+func NewSQLError(number int, sqlState string, format string, args ...interface{}) *SQLError {
+    if sqlState == "" {
+        sqlState = SSUnknownSQLState
+    }
+    return &SQLError{
+        Num:     number,
+        State:   sqlState,
+        Message: fmt.Sprintf(format, args...),
+    }
+}
+
+// Error implements the error interface
+func (se *SQLError) Error() string {
+    buf := &bytes.Buffer{}
+    buf.WriteString(se.Message)
+
+    // Add MySQL errno and SQLSTATE in a format that we can later parse.
+    // There's no avoiding string parsing because all errors
+    // are converted to strings anyway at RPC boundaries.
+    // See NewSQLErrorFromError.
+    fmt.Fprintf(buf, " (errno %v) (sqlstate %v)", se.Num, se.State)
+
+    if se.Query != "" {
+        fmt.Fprintf(buf, " during query: %s", sqlparser.TruncateForLog(se.Query))
+    }
+
+    return buf.String()
+}
+
+// Number returns the internal MySQL error code.
+func (se *SQLError) Number() int {
+    return se.Num
+}
+
+// SQLState returns the SQLSTATE value.
+func (se *SQLError) SQLState() string {
+    return se.State
+}