1 files changed, 57 insertions, 0 deletions
diff --git a/dnsdist-dnsparser.hh b/dnsdist-dnsparser.hh
new file mode 100644
index 0000000..91de7ac
--- /dev/null
+++ b/dnsdist-dnsparser.hh
@@ -0,0 +1,57 @@
+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#pragma once
+
+#include "dnsparser.hh"
+
+namespace dnsdist
+{
+class DNSPacketOverlay
+{
+public:
+  DNSPacketOverlay(const std::string_view& packet);
+
+  struct Record
+  {
+    DNSName d_name;
+    uint32_t d_ttl;
+    uint16_t d_type;
+    uint16_t d_class;
+    uint16_t d_contentLength;
+    uint16_t d_contentOffset;
+    DNSResourceRecord::Place d_place;
+  };
+
+  DNSName d_qname;
+  std::vector<Record> d_records;
+  uint16_t d_qtype;
+  uint16_t d_qclass;
+  dnsheader d_header;
+};
+
+/* Rewrite, if they are exactly equal to 'from', the qname and owner name of any record
+ * to 'to'. Since that might break DNS name pointers, the whole payload is rewritten,
+ * and the operation may fail if there is at least one unsupported record in the payload,
+ * because it could contain pointers that would not be rewritten.
+ */
+bool changeNameInDNSPacket(PacketBuffer& initialPacket, const DNSName& from, const DNSName& to);
+}