Merge pull request #4519 from rgacogne/dnsdist-ecs-rule

dnsdist: Allow altering the ECS behavior via rules and Lua

diff --cc pdns/dnsdist-lua.cc
index 6e64649180880bcd5d77937977fd78ca05179940,c5e90599484ed87caddf3bd9f0d3c7d30681c9d7..046886d04b6634028a871f324500cd1dce8a8a59
--- 1/pdns/dnsdist-lua.cc
--- 2/pdns/dnsdist-lua.cc
+++ b/pdns/dnsdist-lua.cc
@@@ -1481,21 -1481,10 +1481,24 @@@ vector<std::function<void(void)>> setup
    g_lua.registerMember<size_t (DNSQuestion::*)>("size", [](const DNSQuestion& dq) -> size_t { return dq.size; }, [](DNSQuestion& dq, size_t newSize) { (void) newSize; });
    g_lua.registerMember<bool (DNSQuestion::*)>("tcp", [](const DNSQuestion& dq) -> bool { return dq.tcp; }, [](DNSQuestion& dq, bool newTcp) { (void) newTcp; });
    g_lua.registerMember<bool (DNSQuestion::*)>("skipCache", [](const DNSQuestion& dq) -> bool { return dq.skipCache; }, [](DNSQuestion& dq, bool newSkipCache) { dq.skipCache = newSkipCache; });
+   g_lua.registerMember<bool (DNSQuestion::*)>("useECS", [](const DNSQuestion& dq) -> bool { return dq.useECS; }, [](DNSQuestion& dq, bool useECS) { dq.useECS = useECS; });
+   g_lua.registerMember<bool (DNSQuestion::*)>("ecsOverride", [](const DNSQuestion& dq) -> bool { return dq.ecsOverride; }, [](DNSQuestion& dq, bool ecsOverride) { dq.ecsOverride = ecsOverride; });
+   g_lua.registerMember<uint16_t (DNSQuestion::*)>("ecsPrefixLength", [](const DNSQuestion& dq) -> uint16_t { return dq.ecsPrefixLength; }, [](DNSQuestion& dq, uint16_t newPrefixLength) { dq.ecsPrefixLength = newPrefixLength; });
  
 +  /* LuaWrapper doesn't support inheritance */
 +  g_lua.registerMember<const ComboAddress (DNSResponse::*)>("localaddr", [](const DNSResponse& dq) -> const ComboAddress { return *dq.local; }, [](DNSResponse& dq, const ComboAddress newLocal) { (void) newLocal; });
 +  g_lua.registerMember<const DNSName (DNSResponse::*)>("qname", [](const DNSResponse& dq) -> const DNSName { return *dq.qname; }, [](DNSResponse& dq, const DNSName newName) { (void) newName; });
 +  g_lua.registerMember<uint16_t (DNSResponse::*)>("qtype", [](const DNSResponse& dq) -> uint16_t { return dq.qtype; }, [](DNSResponse& dq, uint16_t newType) { (void) newType; });
 +  g_lua.registerMember<uint16_t (DNSResponse::*)>("qclass", [](const DNSResponse& dq) -> uint16_t { return dq.qclass; }, [](DNSResponse& dq, uint16_t newClass) { (void) newClass; });
 +  g_lua.registerMember<int (DNSResponse::*)>("rcode", [](const DNSResponse& dq) -> int { return dq.dh->rcode; }, [](DNSResponse& dq, int newRCode) { dq.dh->rcode = newRCode; });
 +  g_lua.registerMember<const ComboAddress (DNSResponse::*)>("remoteaddr", [](const DNSResponse& dq) -> const ComboAddress { return *dq.remote; }, [](DNSResponse& dq, const ComboAddress newRemote) { (void) newRemote; });
 +  g_lua.registerMember("dh", &DNSResponse::dh);
 +  g_lua.registerMember<uint16_t (DNSResponse::*)>("len", [](const DNSResponse& dq) -> uint16_t { return dq.len; }, [](DNSResponse& dq, uint16_t newlen) { dq.len = newlen; });
 +  g_lua.registerMember<uint8_t (DNSResponse::*)>("opcode", [](const DNSResponse& dq) -> uint8_t { return dq.dh->opcode; }, [](DNSResponse& dq, uint8_t newOpcode) { (void) newOpcode; });
 +  g_lua.registerMember<size_t (DNSResponse::*)>("size", [](const DNSResponse& dq) -> size_t { return dq.size; }, [](DNSResponse& dq, size_t newSize) { (void) newSize; });
 +  g_lua.registerMember<bool (DNSResponse::*)>("tcp", [](const DNSResponse& dq) -> bool { return dq.tcp; }, [](DNSResponse& dq, bool newTcp) { (void) newTcp; });
 +  g_lua.registerMember<bool (DNSResponse::*)>("skipCache", [](const DNSResponse& dq) -> bool { return dq.skipCache; }, [](DNSResponse& dq, bool newSkipCache) { dq.skipCache = newSkipCache; });
 +
    g_lua.writeFunction("setMaxTCPClientThreads", [](uint64_t max) {
        if (!g_configurationDone) {
          g_maxTCPClientThreads = max;