CCats/daemon/include/CovertChannel/BidirectionalChannels.hpp

#ifndef BIDIRECTIONALCHANNELS_H
#define BIDIRECTIONALCHANNELS_H

#include "CovertChannel.h"
#include "Protocols/CovertProtocolBidirectional.hpp"

/**
 * @class BidirectionalChannels
 *
 * Abstract class which implements the methods and constructors which are equal in all bidirectional channels.
 *
 * @param N number of bytes which can be used to transmit data
 * @param PASSIVE true - server only reacts to incoming channel | false - server initiates channel
 */
template <int N, bool PASSIVE> class BidirectionalChannels : public CovertChannel {
public:
	/**
	 * Sets up a CovertChannel.
	 *
	 * Creates a CovertChannel, sets the network interfaces for sniffing and sending and sets the filter.
	 *
	 * @param innerInterface name of the interface of the inner network
	 * @param outerInterface name of the interface of the outer network
	 * @param ownIP IP of this server
	 * @param targetIP IP of the target server
	 * @param targetPort Port of the target server
	 */
	BidirectionalChannels(const std::string &innerInterface, const std::string &outerInterface, const std::string &ownIP, const std::string &targetIP,
	                      const std::string &targetPort)
	    : CovertChannel(innerInterface, outerInterface,
	                    "(not (tcp and " + std::string(PASSIVE ? "src" : "dst") + " host " + targetIP + " and " + std::string(PASSIVE ? "src" : "dst") +
	                        " port " + targetPort + ")) and (not (dst host " + ownIP + "))",
	                    "(not (tcp and " + std::string(PASSIVE ? "dst" : "src") + " host " + targetIP + " and " + std::string(PASSIVE ? "dst" : "src") +
	                        " port " + targetPort + ")) and (not (dst host " + ownIP + "))",
	                    "tcp and " + std::string(PASSIVE ? "src" : "dst") + " host " + targetIP + " and " + std::string(PASSIVE ? "src" : "dst") + " port " +
	                        targetPort,
	                    "tcp and " + std::string(PASSIVE ? "dst" : "src") + " host " + targetIP + " and " + std::string(PASSIVE ? "dst" : "src") + " port " +
	                        targetPort) {}

	/**
	 * Destroys the CovertChannel.
	 */
	virtual ~BidirectionalChannels() {}

	/**
	 * Send a file over the covert channel.
	 *
	 * @param fileName name of the file in the file directory
	 * @return true - file will be sent | false - file was not accepted
	 */
	virtual bool sendFile(const std::string &fileName) {
		if constexpr (PASSIVE) {
			return false;
		} else {
			transferStart = std::time(nullptr);
			return protocol.sendFile(fileName);
		}
	}

	/**
	 * Get the progress
	 *
	 * @return progress counters
	 */
	virtual std::pair<uint32_t, uint32_t> getProgress() {
		if (isTransferRunning()) {
			return protocol.getProgress();
		} else {
			return std::pair<uint32_t, uint32_t>(0, 0);
		}
	}

	/**
	 * Test if a transfer is running
	 *
	 * @return true - a transfer runs | false - no transfer runs
	 */
	virtual bool isTransferRunning() { return protocol.isTransferRunning(); }

protected:
	/**
	 * protocol used to transmit data
	 */
	CovertProtocolBidirectional<N, PASSIVE> protocol;
};

#endif