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WinpcapPacketInterface.cpp
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WinpcapPacketInterface.cpp
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//
// Copyright (c) 2005 L.M.Witek
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from
// the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
#include <iostream>
#include "WinpcapPacketInterface.h"
#include "packet\ARP.h"
#include "packet\iputils.h"
#include "packet\InterfaceEnumerator.h"
using namespace std;
WinpcapPacketInterface::WinpcapPacketInterface()
{
}
WinpcapPacketInterface::~WinpcapPacketInterface()
{
}
void WinpcapPacketInterface::overrideGateway (net::InetAddress gwaddress)
{
m_overridegateway = gwaddress;
}
void WinpcapPacketInterface::initialise (net::InetAddress target)
{
m_target = target;
bool targetIsLocal = false;
// find the route to target host.
packet::getRouteInfo(target, m_source, m_gateway);
if (m_source.getIPAddress() == m_gateway.getIPAddress())
{
targetIsLocal = true;
}
else
{
if (m_overridegateway.getIPAddress() != 0)
m_gateway = m_overridegateway;
}
// find the local interface that hase the source address
packet::InterfaceEnumerator ie;
ie.findLocalInterfaces();
std::string interfaceName;
for (size_t n = 0; n < ie.getInterfaceCount(); n++)
{
const pcap_if_t& iface = ie.getInterface(n);
packet::ListAccessor<pcap_addr> addresses (iface.addresses);
for (size_t addrIndex = 0; addrIndex < addresses.getListLength(); addrIndex++)
{
pcap_addr* address = addresses.at(addrIndex);
net::InetAddress inetAddr(address->addr);
if (inetAddr.getIPAddress() == m_source.getIPAddress())
{
interfaceName = iface.name;
}
}
}
if (interfaceName != "")
{
//cout << "Using interface: " << interfaceName << endl;
m_packetif.openLocal(interfaceName, 2048, 1);
m_packetif.getMACAddress(&m_sourceMAC);
packet::ARP arp(m_packetif);
// if target is not local we need to send packet to gateway.
if (targetIsLocal)
arp.whoHas(m_source, m_target, m_destinationMAC);
else
arp.whoHas(m_source, m_gateway, m_destinationMAC);
// make an ethernet header to send packets with
m_ethernetHeader.clear();
m_ethernetHeader.type = ETHERNET_TYPE_IP;
m_ethernetHeader.srcAddr = m_sourceMAC;
m_ethernetHeader.destAddr = m_destinationMAC;
//if (m_destinationMAC.isHSRP())
// cout << "HSRP MAC Address detected!" << endl;
}
}
net::InetAddress WinpcapPacketInterface::getSourceAddress ()
{
return m_source;
}
void WinpcapPacketInterface::sendPacket (const char *buffer, int len)
{
neo::MemoryBlock packetBuffer (sizeof (m_ethernetHeader) + len);
memcpy (packetBuffer.getBlock(), &m_ethernetHeader, sizeof (m_ethernetHeader));
memcpy (packetBuffer.getBlock()+sizeof (m_ethernetHeader), buffer, len);
m_packetif.sendPacket(packetBuffer.getBlock(), packetBuffer.getSize());
}
bool WinpcapPacketInterface::recPacket (neo::MemoryBlock& buffer, net::InetAddress& from, int timeout)
{
pcap_pkthdr *packetHeader;
const u_char *packetData;
if (m_packetif.readPacket (&packetHeader, &packetData))
{
if (packetHeader->caplen >= ((sizeof(packet::EthernetHeader) + sizeof(packet::IPHeader))))
{
packet::EthernetHeader* header = (packet::EthernetHeader*)packetData;
packet::IPHeader* ipheader = (packet::IPHeader*)(packetData + sizeof(packet::EthernetHeader));
if (header->destAddr == m_sourceMAC && header->type == ETHERNET_TYPE_IP)
{
if (m_destinationMAC.isHSRP() || header->srcAddr == m_destinationMAC)
{
memcpy(buffer.getBlock(), packetData + sizeof(packet::EthernetHeader), packetHeader->caplen - sizeof(packet::EthernetHeader));
from.setIPAddress(ipheader->sourceIP.get());
return true;
}
}
}
}
return false;
}