1 files changed, 60 insertions, 0 deletions
diff --git a/dnsdist-xpf.cc b/dnsdist-xpf.cc
new file mode 100644
index 0000000..6f4cba5
--- /dev/null
+++ b/dnsdist-xpf.cc
@@ -0,0 +1,60 @@
+/*
+ * 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 "dnsdist-xpf.hh"
+
+#include "dnsparser.hh"
+#include "xpf.hh"
+
+bool addXPF(DNSQuestion& dq, uint16_t optionCode)
+{
+  std::string payload = generateXPFPayload(dq.overTCP(), dq.ids.origRemote, dq.ids.origDest);
+  uint8_t root = '\0';
+  dnsrecordheader drh;
+  drh.d_type = htons(optionCode);
+  drh.d_class = htons(QClass::IN);
+  drh.d_ttl = 0;
+  drh.d_clen = htons(payload.size());
+  size_t recordHeaderLen = sizeof(root) + sizeof(drh);
+
+  if (!dq.hasRoomFor(payload.size() + recordHeaderLen)) {
+    return false;
+  }
+
+  size_t xpfSize = sizeof(root) + sizeof(drh) + payload.size();
+  auto& data = dq.getMutableData();
+  uint32_t realPacketLen = getDNSPacketLength(reinterpret_cast<const char*>(data.data()), data.size());
+  data.resize(realPacketLen + xpfSize);
+
+  size_t pos = realPacketLen;
+  memcpy(reinterpret_cast<char*>(&data.at(pos)), &root, sizeof(root));
+  pos += sizeof(root);
+  memcpy(reinterpret_cast<char*>(&data.at(pos)), &drh, sizeof(drh));
+  pos += sizeof(drh);
+  memcpy(reinterpret_cast<char*>(&data.at(pos)), payload.data(), payload.size());
+  pos += payload.size();
+  (void) pos;
+
+  dq.getHeader()->arcount = htons(ntohs(dq.getHeader()->arcount) + 1);
+
+  return true;
+}