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-rw-r--r--protozero.cc159
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+/*
+ * 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 "protozero.hh"
+#include "dnsparser.hh"
+
+void pdns::ProtoZero::Message::encodeComboAddress(const protozero::pbf_tag_type type, const ComboAddress& ca)
+{
+ if (ca.sin4.sin_family == AF_INET) {
+ d_message.add_bytes(type, reinterpret_cast<const char*>(&ca.sin4.sin_addr.s_addr), sizeof(ca.sin4.sin_addr.s_addr));
+ }
+ else if (ca.sin4.sin_family == AF_INET6) {
+ d_message.add_bytes(type, reinterpret_cast<const char*>(&ca.sin6.sin6_addr.s6_addr), sizeof(ca.sin6.sin6_addr.s6_addr));
+ }
+}
+
+void pdns::ProtoZero::Message::encodeNetmask(const protozero::pbf_tag_type type, const Netmask& subnet, uint8_t mask)
+{
+ if (!subnet.empty()) {
+ ComboAddress ca(subnet.getNetwork());
+ ca.truncate(mask);
+ if (ca.sin4.sin_family == AF_INET) {
+ d_message.add_bytes(type, reinterpret_cast<const char*>(&ca.sin4.sin_addr.s_addr), sizeof(ca.sin4.sin_addr.s_addr));
+ }
+ else if (ca.sin4.sin_family == AF_INET6) {
+ d_message.add_bytes(type, reinterpret_cast<const char*>(&ca.sin6.sin6_addr.s6_addr), sizeof(ca.sin6.sin6_addr.s6_addr));
+ }
+ }
+}
+
+void pdns::ProtoZero::Message::encodeDNSName(protozero::pbf_writer& pbf, std::string& buffer, const protozero::pbf_tag_type type, const DNSName& name)
+{
+ // this will append the tag, mark the current position then reserve enough place to write the size
+ protozero::pbf_writer pbf_name{pbf, type};
+ // we append the name to the buffer
+ name.toString(buffer);
+ // leaving the block will cause the sub writer to compute how much was written based on the new size and update the size accordingly
+}
+
+void pdns::ProtoZero::Message::setRequest(const boost::uuids::uuid& uniqueId, const ComboAddress& requestor, const ComboAddress& local, const DNSName& qname, uint16_t qtype, uint16_t qclass, uint16_t id, pdns::ProtoZero::Message::TransportProtocol proto, size_t len)
+{
+ setMessageIdentity(uniqueId);
+ setSocketFamily(requestor.sin4.sin_family);
+ setSocketProtocol(proto);
+ setFrom(requestor);
+ setTo(local);
+ setInBytes(len);
+ setTime();
+ setId(id);
+ setQuestion(qname, qtype, qclass);
+ setFromPort(requestor.getPort());
+ setToPort(local.getPort());
+}
+
+void pdns::ProtoZero::Message::setResponse(const DNSName& qname, uint16_t qtype, uint16_t qclass)
+{
+ setType(pdns::ProtoZero::Message::MessageType::DNSResponseType);
+ setQuestion(qname, qtype, qclass);
+}
+
+void pdns::ProtoZero::Message::addRRsFromPacket(const char* packet, const size_t len, bool includeCNAME)
+{
+ if (len < sizeof(struct dnsheader)) {
+ return;
+ }
+
+ const struct dnsheader* dh = reinterpret_cast<const struct dnsheader*>(packet);
+
+ if (ntohs(dh->ancount) == 0) {
+ return;
+ }
+
+ if (ntohs(dh->qdcount) == 0) {
+ return;
+ }
+
+ PacketReader pr(pdns_string_view(packet, len));
+
+ size_t idx = 0;
+ DNSName rrname;
+ uint16_t qdcount = ntohs(dh->qdcount);
+ uint16_t ancount = ntohs(dh->ancount);
+ uint16_t rrtype;
+ uint16_t rrclass;
+ string blob;
+ struct dnsrecordheader ah;
+
+ rrname = pr.getName();
+ rrtype = pr.get16BitInt();
+ rrclass = pr.get16BitInt();
+ (void) rrtype;
+ (void) rrclass;
+
+ /* consume remaining qd if any */
+ if (qdcount > 1) {
+ for(idx = 1; idx < qdcount; idx++) {
+ rrname = pr.getName();
+ rrtype = pr.get16BitInt();
+ rrclass = pr.get16BitInt();
+ (void) rrtype;
+ (void) rrclass;
+ }
+ }
+
+ /* parse AN */
+ for (idx = 0; idx < ancount; idx++) {
+ rrname = pr.getName();
+ pr.getDnsrecordheader(ah);
+
+ if (ah.d_type == QType::A || ah.d_type == QType::AAAA) {
+ pr.xfrBlob(blob);
+
+ addRR(rrname, ah.d_type, ah.d_class, ah.d_ttl, blob);
+
+ } else if (ah.d_type == QType::CNAME && includeCNAME) {
+ protozero::pbf_writer pbf_rr{d_response, static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::ResponseField::rrs)};
+
+ encodeDNSName(pbf_rr, d_buffer, static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::name), rrname);
+ pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::type), ah.d_type);
+ pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::class_), ah.d_class);
+ pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::ttl), ah.d_ttl);
+ DNSName target;
+ pr.xfrName(target, true);
+ encodeDNSName(pbf_rr, d_buffer, static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::rdata), target);
+ }
+ else {
+ pr.xfrBlob(blob);
+ }
+ }
+}
+
+void pdns::ProtoZero::Message::addRR(const DNSName& name, uint16_t uType, uint16_t uClass, uint32_t uTTL, const std::string& blob)
+{
+ protozero::pbf_writer pbf_rr{d_response, static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::ResponseField::rrs)};
+ encodeDNSName(pbf_rr, d_buffer, static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::name), name);
+ pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::type), uType);
+ pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::class_), uClass);
+ pbf_rr.add_uint32(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::ttl), uTTL);
+ pbf_rr.add_string(static_cast<protozero::pbf_tag_type>(pdns::ProtoZero::Message::RRField::rdata), blob);
+}