CCats/daemon/src/CovertChannel.cpp

#include "../include/CovertChannel.h"
#include <cstdlib>
#include <iostream>
#include <thread>

CovertChannel::CovertChannel(const std::string &innerInterface, const std::string &outerInterface) : innerSender(innerInterface), outerSender(outerInterface) {
	Tins::SnifferConfiguration config;
	config.set_promisc_mode(true);
	config.set_immediate_mode(true);
	config.set_direction(PCAP_D_IN);
	config.set_snap_len(1500);

	try {
		innerSniffer = new Tins::Sniffer(innerInterface, config);
		outerSniffer = new Tins::Sniffer(outerInterface, config);
	} catch (const Tins::pcap_error &e) {
		std::cerr << "An error accured setting up the sniffer: " << e.what() << std::endl;
		std::exit(EXIT_FAILURE);
	}
}

CovertChannel::~CovertChannel() {
	innerSniffer->stop_sniff();
	outerSniffer->stop_sniff();
	delete (innerSniffer);
	delete (outerSniffer);
}

void CovertChannel::startSniffing() {
	std::thread innerSnifferThread(&CovertChannel::startInnerSniffing, this);
	std::thread outerSnifferThread(&CovertChannel::startOuterSniffing, this);
	innerSnifferThread.detach();
	outerSnifferThread.detach();
}

void CovertChannel::startInnerSniffing() { innerSniffer->sniff_loop(make_sniffer_handler(this, &CovertChannel::handleForwardToOuter)); }

void CovertChannel::startOuterSniffing() { outerSniffer->sniff_loop(make_sniffer_handler(this, &CovertChannel::handleForwardToInner)); }

void CovertChannel::setFilter(const std::string &filterString) { innerSniffer->set_filter(filterString); }

bool CovertChannel::handleForwardToInner(Tins::PDU &pdu) {
	innerSender.send(pdu);

	return true;
}

bool CovertChannel::handleForwardToOuter(Tins::PDU &pdu) {
	outerSender.send(pdu);

	return true;
}