1 files changed, 50 insertions, 0 deletions
diff --git a/dnsdist-ecs.hh b/dnsdist-ecs.hh
new file mode 100644
index 0000000..89e6237
--- /dev/null
+++ b/dnsdist-ecs.hh
@@ -0,0 +1,50 @@
+/*
+ * 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
+
+// root label (1), type (2), class (2), ttl (4) + rdlen (2)
+static const size_t optRecordMinimumSize = 11;
+
+extern size_t g_EdnsUDPPayloadSize;
+extern uint16_t g_PayloadSizeSelfGenAnswers;
+
+int rewriteResponseWithoutEDNS(const PacketBuffer& initialPacket, PacketBuffer& newContent);
+bool slowRewriteEDNSOptionInQueryWithRecords(const PacketBuffer& initialPacket, PacketBuffer& newContent, bool& ednsAdded, uint16_t optionToReplace, bool& optionAdded, bool overrideExisting, const string& newOptionContent);
+int locateEDNSOptRR(const PacketBuffer & packet, uint16_t * optStart, size_t * optLen, bool * last);
+bool generateOptRR(const std::string& optRData, PacketBuffer& res, size_t maximumSize, uint16_t udpPayloadSize, uint8_t ednsrcode, bool dnssecOK);
+void generateECSOption(const ComboAddress& source, string& res, uint16_t ECSPrefixLength);
+int removeEDNSOptionFromOPT(char* optStart, size_t* optLen, const uint16_t optionCodeToRemove);
+int rewriteResponseWithoutEDNSOption(const PacketBuffer& initialPacket, const uint16_t optionCodeToSkip, PacketBuffer& newContent);
+int getEDNSOptionsStart(const PacketBuffer& packet, const size_t offset, uint16_t* optRDPosition, size_t * remaining);
+bool isEDNSOptionInOpt(const PacketBuffer& packet, const size_t optStart, const size_t optLen, const uint16_t optionCodeToFind, size_t* optContentStart = nullptr, uint16_t* optContentLen = nullptr);
+bool addEDNS(PacketBuffer& packet, size_t maximumSize, bool dnssecOK, uint16_t payloadSize, uint8_t ednsrcode);
+bool addEDNSToQueryTurnedResponse(DNSQuestion& dq);
+bool setNegativeAndAdditionalSOA(DNSQuestion& dq, bool nxd, const DNSName& zone, uint32_t ttl, const DNSName& mname, const DNSName& rname, uint32_t serial, uint32_t refresh, uint32_t retry, uint32_t expire, uint32_t minimum);
+
+bool handleEDNSClientSubnet(DNSQuestion& dq, bool& ednsAdded, bool& ecsAdded);
+bool handleEDNSClientSubnet(PacketBuffer& packet, size_t maximumSize, size_t qnameWireLength, bool& ednsAdded, bool& ecsAdded, bool overrideExisting, const string& newECSOption);
+
+bool parseEDNSOptions(const DNSQuestion& dq);
+
+int getEDNSZ(const DNSQuestion& dq);
+bool queryHasEDNS(const DNSQuestion& dq);
+bool getEDNS0Record(const DNSQuestion& dq, EDNS0Record& edns0);