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a5122b5032
Given IP-aware ConnKeys, ConnTuples aren't really required any more. ConnTuple had two benefits: - It preserved the original src/dst orientation from the packet headers it was based on, which IPBasedConnKey now tracks and provides accessor methods for. - In IPBasedAnalyzer::AnalyzePacket() its instance survived past the std:move() of the key into NewConn(), which we sidestep by keeping the original src address and port around until we need after the connection is obtained.
55 lines
2.1 KiB
C++
55 lines
2.1 KiB
C++
// See the file "COPYING" in the main distribution directory for copyright.
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#pragma once
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#include "zeek/packet_analysis/Analyzer.h"
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#include "zeek/packet_analysis/Component.h"
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#include "zeek/packet_analysis/protocol/ip/IPBasedAnalyzer.h"
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#include "zeek/packet_analysis/protocol/ip/SessionAdapter.h"
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namespace zeek::packet_analysis::UDP {
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class UDPAnalyzer final : public IP::IPBasedAnalyzer {
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public:
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UDPAnalyzer();
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~UDPAnalyzer() override = default;
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static zeek::packet_analysis::AnalyzerPtr Instantiate() { return std::make_shared<UDPAnalyzer>(); }
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/**
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* Initialize the analyzer. This method is called after the configuration
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* was read. Derived classes can override this method to implement custom
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* initialization.
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*/
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void Initialize() override;
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protected:
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bool InitConnKey(size_t len, const uint8_t* data, Packet* packet, IPBasedConnKey& key) override;
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void DeliverPacket(Connection* c, double t, bool is_orig, int remaining, Packet* pkt) override;
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/**
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* Upon seeing the first packet of a connection, checks whether we want
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* to analyze it (e.g. we may not want to look at partial connections)
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* and, if yes, whether we should flip the roles of originator and
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* responder based on known ports and such.
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*
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* @param src_port The source port of the connection.
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* @param dst_port The destination port of the connection.
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* @param data The payload data for the packet being processed.
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* @param flip_roles Return value if the roles should be flipped.
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* @return True if the connection is wanted. False otherwise.
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*/
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bool WantConnection(uint16_t src_port, uint16_t dst_port, const u_char* data, bool& flip_roles) const override;
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packet_analysis::IP::SessionAdapter* MakeSessionAdapter(Connection* conn) override;
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analyzer::pia::PIA* MakePIA(Connection* conn) override;
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private:
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// Returns true if the checksum is valid, false if not
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static bool ValidateChecksum(const IP_Hdr* ip, const struct udphdr* up, int len);
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std::vector<uint16_t> vxlan_ports;
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};
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} // namespace zeek::packet_analysis::UDP
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