mirror of
https://github.com/mfontanini/libtins
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97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/*
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* Copyright (c) 2014, 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 <tins/tins.h>
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#include <map>
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#include <iostream>
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#include <functional>
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using namespace Tins;
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class arp_monitor {
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public:
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void run(Sniffer &sniffer);
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private:
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bool callback(const PDU &pdu);
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std::map<IPv4Address, HWAddress<6>> addresses;
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};
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void arp_monitor::run(Sniffer &sniffer)
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{
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sniffer.sniff_loop(
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std::bind(
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&arp_monitor::callback,
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this,
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std::placeholders::_1
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)
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);
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}
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bool arp_monitor::callback(const PDU &pdu)
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{
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// Retrieve the ARP layer
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const ARP &arp = pdu.rfind_pdu<ARP>();
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// Is it an ARP reply?
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if(arp.opcode() == ARP::REPLY) {
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// Let's check if there's already an entry for this address
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auto iter = addresses.find(arp.sender_ip_addr());
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if(iter == addresses.end()) {
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// We haven't seen this address. Save it.
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addresses.insert({ arp.sender_ip_addr(), arp.sender_hw_addr()});
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std::cout << "[INFO] " << arp.sender_ip_addr() << " is at "
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<< arp.sender_hw_addr() << std::endl;
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}
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else {
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// We've seen this address. If it's not the same HW address, inform it
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if(arp.sender_hw_addr() != iter->second) {
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std::cout << "[WARNING] " << arp.sender_ip_addr() << " is at "
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<< iter->second << " but also at " << arp.sender_hw_addr()
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<< std::endl;
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}
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}
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}
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return true;
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}
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int main(int argc, char *argv[])
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{
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if(argc != 2) {
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std::cout << "Usage: " << *argv << " <interface>\n";
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return 1;
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}
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arp_monitor monitor;
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// Sniff on the provided interface in promiscuous mode
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Sniffer sniffer(argv[1], Sniffer::PROMISC);
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// Only capture arp packets
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sniffer.set_filter("arp");
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monitor.run(sniffer);
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}
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