107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
/*
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* Copyright (c) 2017, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <iostream>
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#include <string>
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#include <functional>
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#include <tins/tins.h>
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using std::string;
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using std::bind;
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using std::cout;
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using std::endl;
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using std::exception;
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using namespace Tins;
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// This example will capture TCP packets and send packet that will reset
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// the connection when it captures a packet with the SYN and ACK flags on.
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class tcp_connection_closer {
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public:
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tcp_connection_closer() {
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}
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void run(const string& interface) {
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using std::placeholders::_1;
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// Make the PacketSender use this interface by default
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sender_.default_interface(interface);
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// Create the sniffer configuration
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SnifferConfiguration config;
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config.set_filter("tcp");
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// We want to get the packets as fast as possible
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config.set_immediate_mode(true);
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// Create the sniffer and start the capture
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Sniffer sniffer(interface, config);
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sniffer.sniff_loop(bind(&tcp_connection_closer::callback, this, _1));
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}
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private:
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bool callback(const PDU& pdu) {
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const EthernetII& eth = pdu.rfind_pdu<EthernetII>();
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const IP& ip = pdu.rfind_pdu<IP>();
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const TCP& tcp = pdu.rfind_pdu<TCP>();
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// We'll only close a connection when seeing a SYN|ACK
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if (tcp.has_flags(TCP::SYN | TCP::ACK)) {
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// Create an ethernet header flipping the addresses
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EthernetII packet(eth.src_addr(), eth.dst_addr());
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// Do the same for IP
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packet /= IP(ip.src_addr(), ip.dst_addr());
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// Flip TCP ports
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TCP response_tcp(tcp.sport(), tcp.dport());
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// Set RST|ACK flags
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response_tcp.flags(TCP::RST | TCP::ACK);
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// Use the right sequence and ack numbers
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response_tcp.seq(tcp.ack_seq());
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response_tcp.ack_seq(tcp.seq());
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// Add this PDU to the packet we'll send
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packet /= response_tcp;
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// Send it!
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sender_.send(packet);
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}
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return true;
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}
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PacketSender sender_;
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};
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int main(int argc, char* argv[]) {
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if (argc != 2) {
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cout << "Usage: " << *argv << " <interface>" << endl;
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return 1;
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}
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try {
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tcp_connection_closer closer;
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closer.run(argv[1]);
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}
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catch (exception& ex) {
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cout << "[-] Error: " << ex.what() << endl;
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return 1;
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}
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} |