1 files changed, 103 insertions, 0 deletions
diff --git a/dns.cc b/dns.cc
new file mode 100644
index 0000000..01a63d8
--- /dev/null
+++ b/dns.cc
@@ -0,0 +1,103 @@
+/*
+ * 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.
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "dns.hh"
+#include "misc.hh"
+#include <stdexcept>
+#include <iostream>
+#include <boost/algorithm/string.hpp>
+#include <boost/assign/list_of.hpp>
+#include "dnsparser.hh"
+
+std::vector<std::string> RCode::rcodes_s = boost::assign::list_of 
+  ("No Error")
+  ("Form Error")
+  ("Server Failure")
+  ("Non-Existent domain")
+  ("Not Implemented")
+  ("Query Refused")
+  ("Name Exists when it should not")
+  ("RR Set Exists when it should not")
+  ("RR Set that should exist does not")
+  ("Server Not Authoritative for zone / Not Authorized")
+  ("Name not contained in zone")
+  ("Err#11")
+  ("Err#12")
+  ("Err#13")
+  ("Err#14")
+  ("Err#15")  // Last non-extended RCode
+  ("Bad OPT Version / TSIG Signature Failure")
+  ("Key not recognized")
+  ("Signature out of time window")
+  ("Bad TKEY Mode")
+  ("Duplicate key name")
+  ("Algorithm not supported")
+  ("Bad Truncation")
+  ("Bad/missing Server Cookie")
+;
+
+std::string RCode::to_s(uint8_t rcode) {
+  if (rcode > 0xF)
+    return std::string("ErrOutOfRange");
+  return ERCode::to_s(rcode);
+}
+
+std::string ERCode::to_s(uint8_t rcode) {
+  if (rcode > RCode::rcodes_s.size()-1)
+    return std::string("Err#")+std::to_string(rcode);
+  return RCode::rcodes_s[rcode];
+}
+
+std::string Opcode::to_s(uint8_t opcode) {
+  static const std::vector<std::string> s_opcodes = { "Query", "IQuery", "Status", "3", "Notify", "Update" };
+
+  if (opcode >= s_opcodes.size()) {
+    return std::to_string(opcode);
+  }
+
+  return s_opcodes.at(opcode);
+}
+
+// goal is to hash based purely on the question name, and turn error into 'default'
+uint32_t hashQuestion(const uint8_t* packet, uint16_t packet_len, uint32_t init)
+{
+  if (packet_len < sizeof(dnsheader)) {
+    return init;
+  }
+  // C++ 17 does not have std::u8string_view
+  std::basic_string_view<uint8_t> name(packet + sizeof(dnsheader), packet_len - sizeof(dnsheader));
+  std::basic_string_view<uint8_t>::size_type len = 0;
+
+  while (len < name.length()) {
+    uint8_t labellen = name[len++];
+    if (labellen == 0) {
+      // len is name.length() at max as it was < before the increment
+      return burtleCI(name.data(), len, init);
+    }
+    len += labellen;
+  }
+  // We've encountered a label that is too long
+  return init;
+}
+