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.

internal/newdns/record.go

@@ -0,0 +1,67 @@
+package newdns
+
+import (
+	"net"
+
+	"github.com/pkg/errors"
+)
+
+// Record holds a single DNS record.
+type Record struct {
+	// The target address for A, AAAA, CNAME and MX records.
+	Address string
+
+	// The priority for MX records.
+	Priority int
+
+	// The data for TXT records.
+	Data []string
+}
+
+// Validate will validate the record.
+func (r *Record) Validate(typ Type) error {
+	// validate A address
+	if typ == A {
+		ip := net.ParseIP(r.Address)
+		if ip == nil || ip.To4() == nil {
+			return errors.Errorf("invalid IPv4 address: %s", r.Address)
+		}
+	}
+
+	// validate AAAA address
+	if typ == AAAA {
+		ip := net.ParseIP(r.Address)
+		if ip == nil || ip.To16() == nil {
+			return errors.Errorf("invalid IPv6 address: %s", r.Address)
+		}
+	}
+
+	// validate CNAME and MX addresses
+	if typ == CNAME || typ == MX {
+		if !IsDomain(r.Address, true) {
+			return errors.Errorf("invalid domain name: %s", r.Address)
+		}
+	}
+
+	// check TXT data
+	if typ == TXT {
+		if len(r.Data) == 0 {
+			return errors.Errorf("missing data")
+		}
+
+		for _, data := range r.Data {
+			if len(data) > 255 {
+				return errors.Errorf("data too long")
+			}
+		}
+	}
+
+	// validate NS addresses
+	if typ == NS {
+		if !IsDomain(r.Address, true) {
+			return errors.Errorf("invalid ns name: %s", r.Address)
+		}
+	}
+
+	return nil
+}