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-rw-r--r--netwerk/dns/DNSPacket.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/netwerk/dns/DNSPacket.h b/netwerk/dns/DNSPacket.h
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+++ b/netwerk/dns/DNSPacket.h
@@ -0,0 +1,105 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_net_DNSPacket_h__
+#define mozilla_net_DNSPacket_h__
+
+#include "mozilla/Maybe.h"
+#include "mozilla/Result.h"
+#include "nsClassHashtable.h"
+#include "nsIDNSService.h"
+#include "DNS.h"
+#include "DNSByTypeRecord.h"
+
+#include <functional>
+
+namespace mozilla {
+namespace net {
+
+class DOHresp {
+ public:
+ nsresult Add(uint32_t TTL, unsigned char const* dns, unsigned int index,
+ uint16_t len, bool aLocalAllowed);
+ nsTArray<NetAddr> mAddresses;
+ uint32_t mTtl = 0;
+};
+
+// the values map to RFC1035 type identifiers
+enum TrrType {
+ TRRTYPE_A = 1,
+ TRRTYPE_NS = 2,
+ TRRTYPE_CNAME = 5,
+ TRRTYPE_AAAA = 28,
+ TRRTYPE_OPT = 41,
+ TRRTYPE_TXT = 16,
+ TRRTYPE_HTTPSSVC = nsIDNSService::RESOLVE_TYPE_HTTPSSVC, // 65
+};
+
+class DNSPacket {
+ public:
+ // Never accept larger DOH responses than this as that would indicate
+ // something is wrong. Typical ones are much smaller.
+ static const unsigned int MAX_SIZE = 3200;
+
+ DNSPacket() = default;
+ virtual ~DNSPacket() = default;
+
+ Result<uint8_t, nsresult> GetRCode() const;
+ Result<bool, nsresult> RecursionAvailable() const;
+
+ // Called in order to feed data into the buffer.
+ nsresult OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aInputStream,
+ uint64_t aOffset, const uint32_t aCount);
+
+ // Encodes the name request into a buffer that represents a DNS packet
+ virtual nsresult EncodeRequest(nsCString& aBody, const nsACString& aHost,
+ uint16_t aType, bool aDisableECS);
+
+ // Decodes the DNS response and extracts the responses, additional records,
+ // etc. XXX: This should probably be refactored to reduce the number of
+ // output parameters and have a common format for different record types.
+ virtual nsresult Decode(
+ nsCString& aHost, enum TrrType aType, nsCString& aCname,
+ bool aAllowRFC1918, DOHresp& aResp, TypeRecordResultType& aTypeResult,
+ nsClassHashtable<nsCStringHashKey, DOHresp>& aAdditionalRecords,
+ uint32_t& aTTL);
+
+ void SetOriginHost(const Maybe<nsCString>& aHost) { mOriginHost = aHost; }
+
+ nsresult FillBuffer(std::function<int(unsigned char response[MAX_SIZE])>&&);
+
+ static nsresult ParseHTTPS(uint16_t aRDLen, struct SVCB& aParsed,
+ unsigned int aIndex, const unsigned char* aBuffer,
+ unsigned int aBodySize,
+ const nsACString& aOriginHost);
+ void SetNativePacket(bool aNative) { mNativePacket = aNative; }
+
+ protected:
+ nsresult PassQName(unsigned int& index, const unsigned char* aBuffer);
+ static nsresult GetQname(nsACString& aQname, unsigned int& aIndex,
+ const unsigned char* aBuffer,
+ unsigned int aBodySize);
+ static nsresult ParseSvcParam(unsigned int svcbIndex, uint16_t key,
+ SvcFieldValue& field, uint16_t length,
+ const unsigned char* aBuffer);
+ nsresult DecodeInternal(
+ nsCString& aHost, enum TrrType aType, nsCString& aCname,
+ bool aAllowRFC1918, DOHresp& aResp, TypeRecordResultType& aTypeResult,
+ nsClassHashtable<nsCStringHashKey, DOHresp>& aAdditionalRecords,
+ uint32_t& aTTL, const unsigned char* aBuffer, uint32_t aLen);
+
+ // The response buffer.
+ unsigned char mResponse[MAX_SIZE]{};
+ unsigned int mBodySize = 0;
+ // True when decoding a DNS packet received from OS. Decoding will
+ // not panic if packet ID is not zero.
+ bool mNativePacket = false;
+ nsresult mStatus = NS_OK;
+ Maybe<nsCString> mOriginHost;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif // mozilla_net_DNSPacket_h__