491 lines
24 KiB
C++
491 lines
24 KiB
C++
//TODO: replace all these defines with #pragma once
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#ifndef PCAPPP_LIVE_DEVICE
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#define PCAPPP_LIVE_DEVICE
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#include "PcapDevice.h"
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#include <vector>
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#include <string.h>
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#include "IpAddress.h"
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#include "Packet.h"
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/// @file
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/**
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* \namespace pcpp
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* \brief The main namespace for the PcapPlusPlus lib
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*/
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namespace pcpp
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{
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class PcapLiveDevice;
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/**
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* @typedef OnPacketArrivesCallback
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* A callback that is called when a packet is captured by PcapLiveDevice
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* @param[in] pPacket A pointer to the raw packet
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* @param[in] pDevice A pointer to the PcapLiveDevice instance
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* @param[in] userCookie A pointer to the object put by the user when packet capturing stared
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*/
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typedef void (*OnPacketArrivesCallback)(RawPacket* pPacket, PcapLiveDevice* pDevice, void* userCookie);
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/**
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* @typedef OnPacketArrivesStopBlocking
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* A callback that is called when a packet is captured by PcapLiveDevice
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* @param[in] pPacket A pointer to the raw packet
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* @param[in] pDevice A pointer to the PcapLiveDevice instance
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* @param[in] userCookie A pointer to the object put by the user when packet capturing stared
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* @return True when main thread should stop blocking or false otherwise
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*/
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typedef bool (*OnPacketArrivesStopBlocking)(RawPacket* pPacket, PcapLiveDevice* pDevice, void* userData);
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/**
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* @typedef OnStatsUpdateCallback
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* A callback that is called periodically for stats collection if user asked to start packet capturing with periodic stats collection
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* @param[in] stats A reference to the most updated stats
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* @param[in] userCookie A pointer to the object put by the user when packet capturing stared
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*/
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typedef void (*OnStatsUpdateCallback)(pcap_stat& stats, void* userCookie);
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// for internal use only
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typedef void* (*ThreadStart)(void*);
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struct PcapThread;
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/**
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* @class PcapLiveDevice
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* A class that wraps a network interface (each of the interfaces listed in ifconfig/ipconfig).
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* This class wraps the libpcap capabilities of capturing packets from the network, filtering packets and sending packets back to the network.
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* This class is relevant for Linux applications only. On Windows the WinPcapLiveDevice (which inherits this class) is used. Both classes are
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* almost similar in capabilities, the main difference between them is adapting some capabilities to the specific OS.
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* This class cannot be instantiated by the user (it has a private constructor), as network interfaces aren't dynamic. Instances of
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* this class (one instance per network interface) are created by PcapLiveDeviceList singleton on application startup and the user can get
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* access to them by using PcapLiveDeviceList public methods such as PcapLiveDeviceList#getPcapLiveDeviceByIp()<BR>
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* Main capabilities of this class:
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* - Get all available information for this network interfaces such as name, IP addresses, MAC address, MTU, etc. This information is taken
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* from both libpcap and the OS
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* - Capture packets from the network. Capturing is always conducted on a different thread. PcapPlusPlus creates this
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* thread when capturing starts and kills it when capturing ends. This prevents the application from being stuck while waiting for packets or
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* processing them. Currently only one capturing thread is allowed, so when the interface is in capture mode, no further capturing is allowed.
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* In addition to capturing the user can get stats on packets that were received by the application, dropped by the NIC (due to full
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* NIC buffers), etc. Stats collection can be initiated by the user by calling getStatistics() or be pushed to the user periodically by
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* supplying a callback and a timeout to startCapture()
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* - Send packets back to the network. Sending the packets is done on the caller thread. No additional threads are created for this task
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*/
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class PcapLiveDevice : public IPcapDevice
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{
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friend class PcapLiveDeviceList;
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protected:
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// This is a second descriptor for the same device. It is needed because of a bug
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// that occurs in libpcap on Linux (on Windows using WinPcap it works well):
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// It's impossible to capture packets sent by the same descriptor
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pcap_t* m_PcapSendDescriptor;
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const char* m_Name;
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const char* m_Description;
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bool m_IsLoopback;
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uint16_t m_DeviceMtu;
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std::vector<pcap_addr_t> m_Addresses;
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MacAddress m_MacAddress;
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IPv4Address m_DefaultGateway;
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PcapThread* m_CaptureThread;
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bool m_CaptureThreadStarted;
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PcapThread* m_StatsThread;
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bool m_StatsThreadStarted;
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bool m_StopThread;
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OnPacketArrivesCallback m_cbOnPacketArrives;
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void* m_cbOnPacketArrivesUserCookie;
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OnStatsUpdateCallback m_cbOnStatsUpdate;
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void* m_cbOnStatsUpdateUserCookie;
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OnPacketArrivesStopBlocking m_cbOnPacketArrivesBlockingMode;
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void* m_cbOnPacketArrivesBlockingModeUserCookie;
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int m_IntervalToUpdateStats;
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RawPacketVector* m_CapturedPackets;
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bool m_CaptureCallbackMode;
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LinkLayerType m_LinkType;
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// c'tor is not public, there should be only one for every interface (created by PcapLiveDeviceList)
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PcapLiveDevice(pcap_if_t* pInterface, bool calculateMTU, bool calculateMacAddress, bool calculateDefaultGateway);
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// copy c'tor is not public
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PcapLiveDevice( const PcapLiveDevice& other );
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PcapLiveDevice& operator=(const PcapLiveDevice& other);
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void setDeviceMtu();
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void setDeviceMacAddress();
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void setDefaultGateway();
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static void* captureThreadMain(void* ptr);
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static void* statsThreadMain(void* ptr);
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static void onPacketArrives(uint8_t* user, const struct pcap_pkthdr* pkthdr, const uint8_t* packet);
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static void onPacketArrivesNoCallback(uint8_t* user, const struct pcap_pkthdr* pkthdr, const uint8_t* packet);
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static void onPacketArrivesBlockingMode(uint8_t* user, const struct pcap_pkthdr* pkthdr, const uint8_t* packet);
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std::string printThreadId(PcapThread* id);
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virtual ThreadStart getCaptureThreadStart();
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public:
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/**
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* The type of the live device
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*/
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enum LiveDeviceType
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{
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/** libPcap live device */
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LibPcapDevice,
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/** WinPcap live device */
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WinPcapDevice,
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/** WinPcap Remote Capture device */
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RemoteDevice
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};
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/**
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* Device capturing mode
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*/
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enum DeviceMode
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{
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/** Only packets that their destination is this NIC are captured */
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Normal = 0,
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/** All packets that arrive to the NIC are captured, even packets that their destination isn't this NIC */
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Promiscuous = 1
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};
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/**
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* Set direction for capturing packets (you can read more here: <https://www.tcpdump.org/manpages/pcap.3pcap.html#lbAI>)
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*/
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enum PcapDirection
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{
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/** Capture traffics both incoming and outgoing */
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PCPP_INOUT = 0,
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/** Only capture incoming traffics */
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PCPP_IN,
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/** Only capture outgoing traffics */
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PCPP_OUT
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};
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/**
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* @struct DeviceConfiguration
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* A struct that contains user configurable parameters for opening a device. All parameters have default values so
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* the user isn't expected to set all parameters or understand exactly how they work
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*/
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struct DeviceConfiguration
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{
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/** Indicates whether to open the device in promiscuous or normal mode */
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DeviceMode mode;
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/** Set the packet buffer timeout in milliseconds. You can read more here:
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* https://www.tcpdump.org/manpages/pcap.3pcap.html .
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* Any value above 0 is considered legal, otherwise a value of 1 or -1 is used (depends on the platform)
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*/
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int packetBufferTimeoutMs;
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/**
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* Set the packet buffer size. You can read more about the packet buffer here:
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* https://www.tcpdump.org/manpages/pcap.3pcap.html .
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* Any value of 100 or above is considered valid, otherwise the default value is used (which varies between different OS's).
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* However, please notice that setting values which are too low or two high may result in failure to open the device.
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* These too low or too high thresholds may vary between OS's, as an example please refer to this thread:
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* https://stackoverflow.com/questions/11397367/issue-in-pcap-set-buffer-size
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*/
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int packetBufferSize;
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/**
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* Set the direction for capturing packets. You can read more here:
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* <https://www.tcpdump.org/manpages/pcap.3pcap.html#lbAI>.
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*/
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PcapDirection direction;
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/**
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* A c'tor for this struct
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* @param[in] mode The mode to open the device: promiscuous or non-promiscuous. Default value is promiscuous
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* @param[in] packetBufferTimeoutMs Buffer timeout in millisecond. Default value is 0 which means set timeout of
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* 1 or -1 (depends on the platform)
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* @param[in] packetBufferSize The packet buffer size. Default value is 0 which means use the default value
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* (varies between different OS's)
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* @param[in] direction Direction for capturing packtes. Default value is INOUT which means capture both incoming
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* and outgoing packets (not all platforms support this)
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*/
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DeviceConfiguration(DeviceMode mode = Promiscuous, int packetBufferTimeoutMs = 0, int packetBufferSize = 0, PcapDirection direction = PCPP_INOUT)
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{
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this->mode = mode;
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this->packetBufferTimeoutMs = packetBufferTimeoutMs;
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this->packetBufferSize = packetBufferSize;
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this->direction = PCPP_INOUT;
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}
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};
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/**
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* A destructor for this class
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*/
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virtual ~PcapLiveDevice();
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/**
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* @return The type of the device (libPcap, WinPcap or a remote device)
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*/
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virtual LiveDeviceType getDeviceType() const { return LibPcapDevice; }
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/**
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* @return The name of the device (e.g eth0), taken from pcap_if_t->name
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*/
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const char* getName() const { return m_Name; }
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/**
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* @return A human-readable description of the device, taken from pcap_if_t->description. May be NULL in some interfaces
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*/
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const char* getDesc() const { return m_Description; }
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/**
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* @return True if this interface is a loopback interface, false otherwise
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*/
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bool getLoopback() const { return m_IsLoopback; }
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/**
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* @return The device's maximum transmission unit (MTU) in bytes
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*/
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virtual uint16_t getMtu() const { return m_DeviceMtu; }
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/**
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* @return The device's link layer type
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*/
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virtual LinkLayerType getLinkType() const { return m_LinkType; }
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/**
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* @return A vector containing all addresses defined for this interface, each in pcap_addr_t struct
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*/
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const std::vector<pcap_addr_t>& getAddresses() const { return m_Addresses; }
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/**
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* @return The MAC address for this interface
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*/
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virtual MacAddress getMacAddress() const { return m_MacAddress; }
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/**
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* @return The IPv4 address for this interface. If multiple IPv4 addresses are defined for this interface, the first will be picked.
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* If no IPv4 addresses are defined, a zeroed IPv4 address (IPv4Address#Zero) will be returned
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*/
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IPv4Address getIPv4Address() const;
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/**
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* @return The default gateway defined for this interface. If no default gateway is defined, if it's not IPv4 or if couldn't extract
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* default gateway IPv4Address#Zero will be returned. If multiple gateways were defined the first one will be returned
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*/
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IPv4Address getDefaultGateway() const;
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/**
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* @return A list of all DNS servers defined for this machine. If this list is empty it means no DNS servers were defined or they
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* couldn't be extracted from some reason. This list is created in PcapLiveDeviceList class and can be also retrieved from there.
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* This method exists for convenience - so it'll be possible to get this list from PcapLiveDevice as well
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*/
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const std::vector<IPv4Address>& getDnsServers() const;
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/**
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* Start capturing packets on this network interface (device). Each time a packet is captured the onPacketArrives callback is called.
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* The capture is done on a new thread created by this method, meaning all callback calls are done in a thread other than the
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* caller thread. Capture process will stop and this capture thread will be terminated when calling stopCapture(). This method must be
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* called after the device is opened (i.e the open() method was called), otherwise an error will be returned.
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* @param[in] onPacketArrives A callback that is called each time a packet is captured
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* @param[in] onPacketArrivesUserCookie A pointer to a user provided object. This object will be transferred to the onPacketArrives callback
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* each time it is called. This cookie is very useful for transferring objects that give context to the capture callback, for example:
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* objects that counts packets, manages flow state or manages the application state according to the packet that was captured
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* @return True if capture started successfully, false if (relevant log error is printed in any case):
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* - Capture is already running
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* - Device is not opened
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* - Capture thread could not be created
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*/
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virtual bool startCapture(OnPacketArrivesCallback onPacketArrives, void* onPacketArrivesUserCookie);
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/**
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* Start capturing packets on this network interface (device) with periodic stats collection. Each time a packet is captured the onPacketArrives
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* callback is called. In addition, each intervalInSecondsToUpdateStats seconds stats are collected from the device and the onStatsUpdate
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* callback is called. Both the capture and periodic stats collection are done on new threads created by this method, each on a different thread,
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* meaning all callback calls are done in threads other than the caller thread. Capture process and stats collection will stop and threads will be
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* terminated when calling stopCapture(). This method must be called after the device is opened (i.e the open() method was called), otherwise an
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* error will be returned.
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* @param[in] onPacketArrives A callback that is called each time a packet is captured
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* @param[in] onPacketArrivesUserCookie A pointer to a user provided object. This object will be transferred to the onPacketArrives callback
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* each time it is called. This cookie is very useful for transferring objects that give context to the capture callback, for example:
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* objects that counts packets, manages flow state or manages the application state according to the packet that was captured
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* @param[in] intervalInSecondsToUpdateStats The interval in seconds to activate periodic stats collection
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* @param[in] onStatsUpdate A callback that will be called each time intervalInSecondsToUpdateStats expires and stats are collected. This
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* callback will contain the collected stats
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* @param[in] onStatsUpdateUserCookie A pointer to a user provided object. This object will be transferred to the onStatsUpdate callback
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* each time it is called
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* @return True if capture started successfully, false if (relevant log error is printed in any case):
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* - Capture is already running
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* - Device is not opened
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* - Capture thread could not be created
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* - Stats collection thread could not be created
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*/
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virtual bool startCapture(OnPacketArrivesCallback onPacketArrives, void* onPacketArrivesUserCookie, int intervalInSecondsToUpdateStats, OnStatsUpdateCallback onStatsUpdate, void* onStatsUpdateUserCookie);
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/**
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* Start capturing packets on this network interface (device) with periodic stats collection only. This means that packets arriving to the
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* network interface aren't delivered to the user but only counted. Each intervalInSecondsToUpdateStats seconds stats are collected from the
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* device and the onStatsUpdate callback is called with the updated counters. The periodic stats collection is done on a new thread created
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* by this method, meaning all callback calls are done in threads other than the caller thread. Stats collection will stop and threads will
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* be terminated when calling stopCapture(). This method must be called after the device is opened (i.e the open() method was called),
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* otherwise an error will be returned.
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* @param[in] intervalInSecondsToUpdateStats The interval in seconds to activate periodic stats collection
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* @param[in] onStatsUpdate A callback that will be called each time intervalInSecondsToUpdateStats expires and stats are collected. This
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* callback will contain the collected stats
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* @param[in] onStatsUpdateUserCookie A pointer to a user provided object. This object will be transferred to the onStatsUpdate callback
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* each time it is called
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* @return True if capture started successfully, false if (relevant log error is printed in any case):
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* - Capture is already running
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* - Device is not opened
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* - Stats collection thread could not be created
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*/
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virtual bool startCapture(int intervalInSecondsToUpdateStats, OnStatsUpdateCallback onStatsUpdate, void* onStatsUpdateUserCookie);
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/**
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* Start capturing packets on this network interface (device). All captured packets are added to capturedPacketsVector, so at the end of
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* the capture (when calling stopCapture()) this vector contains pointers to all captured packets in the form of RawPacket. The capture
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* is done on a new thread created by this method, meaning capturedPacketsVector is updated from another thread other than the caller
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* thread (so user should avoid changing or iterating this vector while capture is on). Capture process will stop and this capture thread
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* will be terminated when calling stopCapture(). This method must be called after the device is opened (i.e the open() method was called),
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* otherwise an error will be returned.
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* @param[in] capturedPacketsVector A reference to a RawPacketVector, meaning a vector of pointer to RawPacket objects
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* @return True if capture started successfully, false if (relevant log error is printed in any case):
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* - Capture is already running
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* - Device is not opened
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* - Capture thread could not be created
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*/
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virtual bool startCapture(RawPacketVector& capturedPacketsVector);
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/**
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* Start capturing packets on this network interface (device) in blocking mode, meaning this method blocks and won't return until
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* the user frees the blocking (via onPacketArrives callback) or until a user defined timeout expires.
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* Whenever a packets is captured the onPacketArrives callback is called and lets the user handle the packet. In each callback call
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* the user should return true if he wants to release the block or false if it wants it to keep blocking. Regardless of this callback
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* a timeout is defined when start capturing. When this timeout expires the method will return.<BR>
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* Please notice that stopCapture() isn't needed here because when the method returns (after timeout or per user decision) capturing
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* on the device is stopped
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* @param[in] onPacketArrives A callback given by the user for handling incoming packets. After handling each packet the user needs to
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* return a boolean value. True value indicates stop capturing and stop blocking and false value indicates continue capturing and blocking
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* @param[in] userCookie A pointer to a user provided object. This object will be transferred to the onPacketArrives callback
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* each time it is called. This cookie is very useful for transferring objects that give context to the capture callback, for example:
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* objects that counts packets, manages flow state or manages the application state according to the packet that was captured
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* @param[in] timeout A timeout in seconds for the blocking to stop even if the user didn't return "true" in the onPacketArrives callback
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* If this timeout is set to 0 or less the timeout will be ignored, meaning the method will keep blocking until the user frees it via
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* the onPacketArrives callback
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* @return -1 if timeout expired, 1 if blocking was stopped via onPacketArrives callback or 0 if an error occurred (such as device
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* not open etc.). When returning 0 an appropriate error message is printed to log
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*/
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virtual int startCaptureBlockingMode(OnPacketArrivesStopBlocking onPacketArrives, void* userCookie, int timeout);
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/**
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* Stop a currently running packet capture. This method terminates gracefully both packet capture thread and periodic stats collection
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* thread (both if exist)
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*/
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void stopCapture();
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/**
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* Check if a capture thread is running
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* @return True if a capture thread is currently running
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*/
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bool captureActive();
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/**
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* Send a RawPacket to the network
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* @param[in] rawPacket A reference to the raw packet to send. This method treats the raw packet as read-only, it doesn't change anything
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* in it
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* @return True if packet was sent successfully. False will be returned in the following cases (relevant log error is printed in any case):
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* - Device is not opened
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* - Packet length is 0
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* - Packet length is larger than device MTU
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* - Packet could not be sent due to some error in libpcap/WinPcap
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*/
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bool sendPacket(RawPacket const& rawPacket);
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/**
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* Send a buffer containing packet raw data (including all layers) to the network
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* @param[in] packetData The buffer containing the packet raw data
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* @param[in] packetDataLength The length of the buffer
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* @return True if packet was sent successfully. False will be returned in the following cases (relevant log error is printed in any case):
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* - Device is not opened
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* - Packet length is 0
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* - Packet length is larger than device MTU
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* - Packet could not be sent due to some error in libpcap/WinPcap
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*/
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bool sendPacket(const uint8_t* packetData, int packetDataLength);
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/**
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* Send a parsed Packet to the network
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* @param[in] packet A pointer to the packet to send. This method treats the packet as read-only, it doesn't change anything in it
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* @return True if packet was sent successfully. False will be returned in the following cases (relevant log error is printed in any case):
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* - Device is not opened
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* - Packet length is 0
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* - Packet length is larger than device MTU
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* - Packet could not be sent due to some error in libpcap/WinPcap
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*/
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bool sendPacket(Packet* packet);
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/**
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* Send an array of RawPacket objects to the network
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* @param[in] rawPacketsArr The array of RawPacket objects to send. This method treats all packets as read-only, it doesn't change anything
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* in them
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|
* @param[in] arrLength The length of the array
|
|
* @return The number of packets sent successfully. Sending a packet can fail if:
|
|
* - Device is not opened. In this case no packets will be sent, return value will be 0
|
|
* - Packet length is 0
|
|
* - Packet length is larger than device MTU
|
|
* - Packet could not be sent due to some error in libpcap/WinPcap
|
|
*/
|
|
virtual int sendPackets(RawPacket* rawPacketsArr, int arrLength);
|
|
|
|
/**
|
|
* Send an array of pointers to Packet objects to the network
|
|
* @param[in] packetsArr The array of pointers to Packet objects to send. This method treats all packets as read-only, it doesn't change
|
|
* anything in them
|
|
* @param[in] arrLength The length of the array
|
|
* @return The number of packets sent successfully. Sending a packet can fail if:
|
|
* - Device is not opened. In this case no packets will be sent, return value will be 0
|
|
* - Packet length is 0
|
|
* - Packet length is larger than device MTU
|
|
* - Packet could not be sent due to some error in libpcap/WinPcap
|
|
*/
|
|
virtual int sendPackets(Packet** packetsArr, int arrLength);
|
|
|
|
/**
|
|
* Send a vector of pointers to RawPacket objects to the network
|
|
* @param[in] rawPackets The array of pointers to RawPacket objects to send. This method treats all packets as read-only, it doesn't change
|
|
* anything in them
|
|
* @return The number of packets sent successfully. Sending a packet can fail if:
|
|
* - Device is not opened. In this case no packets will be sent, return value will be 0
|
|
* - Packet length is 0
|
|
* - Packet length is larger than device MTU
|
|
* - Packet could not be sent due to some error in libpcap/WinPcap
|
|
*/
|
|
virtual int sendPackets(const RawPacketVector& rawPackets);
|
|
|
|
|
|
// implement abstract methods
|
|
|
|
/**
|
|
* Open the device using libpcap pcap_open_live. Opening the device only makes the device ready for use, it doesn't start packet capturing.
|
|
* For packet capturing the user should call startCapture(). This implies that calling this method is a must before calling startCapture()
|
|
* (otherwise startCapture() will fail with a "device not open" error). The device is opened in promiscuous mode
|
|
* @return True if the device was opened successfully, false otherwise. When opening the device fails an error will be printed to log
|
|
* as well
|
|
*/
|
|
bool open();
|
|
|
|
/**
|
|
* Enables to open a device in a non-default configuration. Configuration has parameters like packet buffer timeout & size, open in
|
|
* promiscuous/non-promiscuous mode, etc. Please check DeviceConfiguration for more details
|
|
* @param[in] config The requested configuration
|
|
* @return Same as 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
|