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_utils.go

@@ -0,0 +1,71 @@
+package vmysql
+
+import (
+	"vitess.io/vitess/go/sqltypes"
+	"vitess.io/vitess/go/vt/proto/query"
+)
+
+type Column struct {
+	// Name is the name of the column.
+	Name string
+	// Type is the data type of the column.
+	Type query.Type
+	// Default contains the default value of the column or nil if it is NULL.
+	Default interface{}
+	// Nullable is true if the column can contain NULL values, or false
+	// otherwise.
+	Nullable bool
+	// Source is the name of the table this column came from.
+	Source string
+	// PrimaryKey is true if the column is part of the primary key for its table.
+	PrimaryKey bool
+}
+
+type Schema []*Column
+type SQLRow []interface{}
+
+func SchemaToFields(s Schema) []*query.Field {
+	fields := make([]*query.Field, len(s))
+	for i, c := range s {
+		var charset uint32 = CharacterSetUtf8
+		if c.Type == sqltypes.Blob {
+			charset = CharacterSetBinary
+		}
+
+		fields[i] = &query.Field{
+			Name:    c.Name,
+			Type:    c.Type,
+			Charset: charset,
+		}
+	}
+	return fields
+}
+
+func RowToSQL(row SQLRow) []sqltypes.Value {
+	o := make([]sqltypes.Value, len(row))
+
+	for i, v := range row {
+		switch value := v.(type) {
+		case []byte:
+			o[i] = sqltypes.MakeTrusted(sqltypes.Blob, value)
+		case string:
+			o[i] = sqltypes.MakeTrusted(sqltypes.Text, []byte(value))
+		default:
+			o[i] = sqltypes.MakeTrusted(sqltypes.Blob, []byte{})
+		}
+	}
+
+	return o
+}
+
+func GetMysqlVars() *sqltypes.Result {
+	r := &sqltypes.Result{Fields: SchemaToFields(Schema{
+		{Name: "system_time_zone", Type: sqltypes.Text, Nullable: false},
+		{Name: "time_zone", Type: sqltypes.Text, Nullable: false},
+		{Name: "init_connect", Type: sqltypes.Text, Nullable: false},
+		{Name: "auto_increment_increment", Type: sqltypes.Text, Nullable: false},
+		{Name: "max_allowed_packet", Type: sqltypes.Text, Nullable: false},
+	})}
+	r.Rows = append(r.Rows, RowToSQL(SQLRow{"UTC", "SYSTEM", "", "1", "10000"}))
+	return r
+}