PcapLiveDevice.h

Go to the documentation of this file.

//TODO: replace all these defines with #pragma once
#ifndef PCAPPP_LIVE_DEVICE
#define PCAPPP_LIVE_DEVICE
 
#include "PcapDevice.h"
#include <vector>
#include <string.h>
#include "IpAddress.h"
#include "Packet.h"
 
 
 
namespace pcpp
{
 
    class PcapLiveDevice;
 
    typedef void (*OnPacketArrivesCallback)(RawPacket* pPacket, PcapLiveDevice* pDevice, void* userCookie);
 
    typedef bool (*OnPacketArrivesStopBlocking)(RawPacket* pPacket, PcapLiveDevice* pDevice, void* userData);
 
 
    typedef void (*OnStatsUpdateCallback)(pcap_stat& stats, void* userCookie);
 
    // for internal use only
    typedef void* (*ThreadStart)(void*);
 
    struct PcapThread;
 
    class PcapLiveDevice : public IPcapDevice
    {
        friend class PcapLiveDeviceList;
    protected:
        // This is a second descriptor for the same device. It is needed because of a bug
        // that occurs in libpcap on Linux (on Windows using WinPcap it works well):
        // It's impossible to capture packets sent by the same descriptor
        pcap_t* m_PcapSendDescriptor;
        const char* m_Name;
        const char* m_Description;
        bool m_IsLoopback;
        uint16_t m_DeviceMtu;
        std::vector<pcap_addr_t> m_Addresses;
        MacAddress m_MacAddress;
        IPv4Address m_DefaultGateway;
        PcapThread* m_CaptureThread;
        bool m_CaptureThreadStarted;
        PcapThread* m_StatsThread;
        bool m_StatsThreadStarted;
        bool m_StopThread;
        OnPacketArrivesCallback m_cbOnPacketArrives;
        void* m_cbOnPacketArrivesUserCookie;
        OnStatsUpdateCallback m_cbOnStatsUpdate;
        void* m_cbOnStatsUpdateUserCookie;
        OnPacketArrivesStopBlocking m_cbOnPacketArrivesBlockingMode;
        void* m_cbOnPacketArrivesBlockingModeUserCookie;
        int m_IntervalToUpdateStats;
        RawPacketVector* m_CapturedPackets;
        bool m_CaptureCallbackMode;
        LinkLayerType m_LinkType;
 
        // c'tor is not public, there should be only one for every interface (created by PcapLiveDeviceList)
        PcapLiveDevice(pcap_if_t* pInterface, bool calculateMTU, bool calculateMacAddress, bool calculateDefaultGateway);
        // copy c'tor is not public
        PcapLiveDevice( const PcapLiveDevice& other );
        PcapLiveDevice& operator=(const PcapLiveDevice& other);
 
        void setDeviceMtu();
        void setDeviceMacAddress();
        void setDefaultGateway();
        static void* captureThreadMain(void* ptr);
        static void* statsThreadMain(void* ptr);
        static void onPacketArrives(uint8_t* user, const struct pcap_pkthdr* pkthdr, const uint8_t* packet);
        static void onPacketArrivesNoCallback(uint8_t* user, const struct pcap_pkthdr* pkthdr, const uint8_t* packet);
        static void onPacketArrivesBlockingMode(uint8_t* user, const struct pcap_pkthdr* pkthdr, const uint8_t* packet);
        std::string printThreadId(PcapThread* id);
        virtual ThreadStart getCaptureThreadStart();
    public:
 
        enum LiveDeviceType
        {
            LibPcapDevice,
            WinPcapDevice,
            RemoteDevice
        };
 
 
        enum DeviceMode
        {
            Normal = 0,
            Promiscuous = 1
        };
 
 
        enum PcapDirection
        {
            PCPP_INOUT = 0,
            PCPP_IN,
            PCPP_OUT
        };
 
 
        struct DeviceConfiguration
        {
            DeviceMode mode;
 
            int packetBufferTimeoutMs;
 
            int packetBufferSize;
 
            PcapDirection direction;
 
            DeviceConfiguration(DeviceMode mode = Promiscuous, int packetBufferTimeoutMs = 0, int packetBufferSize = 0, PcapDirection direction = PCPP_INOUT)
            {
                this->mode = mode;
                this->packetBufferTimeoutMs = packetBufferTimeoutMs;
                this->packetBufferSize = packetBufferSize;
                this->direction = PCPP_INOUT;
            }
        };
 
 
        virtual ~PcapLiveDevice();
 
        virtual LiveDeviceType getDeviceType() const { return LibPcapDevice; }
 
        const char* getName() const { return m_Name; }
 
        const char* getDesc() const { return m_Description; }
 
        bool getLoopback() const { return m_IsLoopback; }
 
        virtual uint16_t getMtu() const { return m_DeviceMtu; }
 
        virtual LinkLayerType getLinkType() const { return m_LinkType; }
        const std::vector<pcap_addr_t>& getAddresses() const { return m_Addresses; }
 
        virtual MacAddress getMacAddress() const { return m_MacAddress; }
 
        IPv4Address getIPv4Address() const;
 
        IPv4Address getDefaultGateway() const;
 
        const std::vector<IPv4Address>& getDnsServers() const;
 
        virtual bool startCapture(OnPacketArrivesCallback onPacketArrives, void* onPacketArrivesUserCookie);
 
        virtual bool startCapture(OnPacketArrivesCallback onPacketArrives, void* onPacketArrivesUserCookie, int intervalInSecondsToUpdateStats, OnStatsUpdateCallback onStatsUpdate, void* onStatsUpdateUserCookie);
 
        virtual bool startCapture(int intervalInSecondsToUpdateStats, OnStatsUpdateCallback onStatsUpdate, void* onStatsUpdateUserCookie);
 
        virtual bool startCapture(RawPacketVector& capturedPacketsVector);
 
        virtual int startCaptureBlockingMode(OnPacketArrivesStopBlocking onPacketArrives, void* userCookie, int timeout);
 
        void stopCapture();
 
        bool captureActive();
 
        bool sendPacket(RawPacket const& rawPacket);
 
        bool sendPacket(const uint8_t* packetData, int packetDataLength);
 
        bool sendPacket(Packet* packet);
 
        virtual int sendPackets(RawPacket* rawPacketsArr, int arrLength);
 
        virtual int sendPackets(Packet** packetsArr, int arrLength);
 
        virtual int sendPackets(const RawPacketVector& rawPackets);
 
 
        // implement abstract methods
 
        bool open();
 
        bool open(const DeviceConfiguration& config);
 
        void close();
 
        virtual void getStatistics(pcap_stat& stats) const;
 
    protected:
        pcap_t* doOpen(const DeviceConfiguration& config);
    };
 
} // namespace pcpp
 
#endif