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/*
* Copyright (c) 2017, Matias Fontanini
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <tins/tins.h>
#include <map>
#include <iostream>
#include <functional>
using std::cout;
using std::endl;
using std::map;
using std::bind;
using namespace Tins;
class arp_monitor {
public:
void run(Sniffer& sniffer);
private:
bool callback(const PDU& pdu);
map<IPv4Address, HWAddress<6>> addresses;
};
void arp_monitor::run(Sniffer& sniffer) {
sniffer.sniff_loop(
bind(
&arp_monitor::callback,
this,
std::placeholders::_1
)
);
}
bool arp_monitor::callback(const PDU& pdu) {
// Retrieve the ARP layer
const ARP& arp = pdu.rfind_pdu<ARP>();
// Is it an ARP reply?
if (arp.opcode() == ARP::REPLY) {
// Let's check if there's already an entry for this address
auto iter = addresses.find(arp.sender_ip_addr());
if (iter == addresses.end()) {
// We haven't seen this address. Save it.
addresses.insert({ arp.sender_ip_addr(), arp.sender_hw_addr()});
cout << "[INFO] " << arp.sender_ip_addr() << " is at "
<< arp.sender_hw_addr() << std::endl;
}
else {
// We've seen this address. If it's not the same HW address, inform it
if (arp.sender_hw_addr() != iter->second) {
cout << "[WARNING] " << arp.sender_ip_addr() << " is at "
<< iter->second << " but also at " << arp.sender_hw_addr()
<< endl;
}
}
}
return true;
}
int main(int argc, char* argv[]) {
if(argc != 2) {
cout << "Usage: " <<* argv << " <interface>" << endl;
return 1;
}
arp_monitor monitor;
// Sniffer configuration
SnifferConfiguration config;
config.set_promisc_mode(true);
config.set_filter("arp");
try {
// Sniff on the provided interface in promiscuous mode
Sniffer sniffer(argv[1], config);
// Only capture arp packets
monitor.run(sniffer);
}
catch (std::exception& ex) {
std::cerr << "Error: " << ex.what() << std::endl;
}
}
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