1 files changed, 65 insertions, 0 deletions
diff --git a/ednsextendederror.cc b/ednsextendederror.cc
new file mode 100644
index 0000000..5010e3d
--- /dev/null
+++ b/ednsextendederror.cc
@@ -0,0 +1,65 @@
+/*
+ * 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.
+ */
+#include <limits>
+
+#include "ednsextendederror.hh"
+
+static bool getEDNSExtendedErrorOptFromStringView(const std::string_view& option, EDNSExtendedError& eee)
+{
+  if (option.size() < sizeof(uint16_t)) {
+    return false;
+  }
+  eee.infoCode = static_cast<uint8_t>(option.at(0)) * 256 + static_cast<uint8_t>(option.at(1));
+
+  if (option.size() > sizeof(uint16_t)) {
+    eee.extraText = std::string(&option.at(sizeof(uint16_t)), option.size() - sizeof(uint16_t));
+  }
+
+  return true;
+}
+
+bool getEDNSExtendedErrorOptFromString(const string& option, EDNSExtendedError& eee)
+{
+  return getEDNSExtendedErrorOptFromStringView(std::string_view(option), eee);
+}
+
+bool getEDNSExtendedErrorOptFromString(const char* option, unsigned int len, EDNSExtendedError& eee)
+{
+  return getEDNSExtendedErrorOptFromStringView(std::string_view(option, len), eee);
+}
+
+string makeEDNSExtendedErrorOptString(const EDNSExtendedError& eee)
+{
+  if (eee.extraText.size() > static_cast<size_t>(std::numeric_limits<uint16_t>::max() - 2)) {
+    throw std::runtime_error("Trying to create an EDNS Extended Error option with an extra text of size " + std::to_string(eee.extraText.size()));
+  }
+
+  string ret;
+  ret.reserve(sizeof(uint16_t) + eee.extraText.size());
+  ret.resize(sizeof(uint16_t));
+
+  ret[0] = static_cast<char>(static_cast<uint16_t>(eee.infoCode) / 256);
+  ret[1] = static_cast<char>(static_cast<uint16_t>(eee.infoCode) % 256);
+  ret.append(eee.extraText);
+
+  return ret;
+}