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misc: small fix or general refactoring i did not bother commenting

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evilsocket 2018-02-15 19:51:29 +01:00
commit c744875136
1 changed files with 48 additions and 7 deletions
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55
modules/arp_spoof.go
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@ -144,18 +144,59 @@ func (p *ArpSpoofer) pktRouter(eth *layers.Ethernet, ip4 *layers.IPv4, pkt gopac
return
}
// we want everything which is directed to our mac but not our ip
if bytes.Compare(eth.DstMAC, p.Session.Interface.HW) == 0 && ip4.DstIP.Equal(p.Session.Interface.IP) == false {
// get the real mac of the destination ip
hw, err := p.getMAC(ip4.DstIP, false)
// check if this packet is from or to one of the spoofing targets
// and therefore needs patching and forwarding.
for _, target := range p.addresses {
// we're only interested in packets:
//
// 1. generated from one of our targets.
// 2. going to the router IP
// 3. but with our mac addresses as destination
targetMAC, err := p.getMAC(target, true)
if err != nil {
log.Error("Error while looking up hardware address for %s: %s", ip4.DstIP.String(), err)
log.Error("Error retrieving target MAC address for %s", target.String(), err)
return
}
log.Info("Rerouting packet: %s -> %s (%s)", ip4.SrcIP.String(), ip4.DstIP.String(), eth.DstMAC.String())
// If SRC_MAC is different from both TARGET(s) & GW ignore
if bytes.Compare(eth.SrcMAC, targetMAC) != 0 && bytes.Compare(eth.SrcMAC, p.Session.Gateway.HW) != 0 {
// TODO Delete this debug
//log.Debug("[ignored] [%s] ===> [%s]", eth.SrcMAC, eth.DstMAC)
continue
}
copy(eth.DstMAC, hw)
// If DST_MAC is not our Interface.IP ignore
if bytes.Compare(eth.DstMAC, p.Session.Interface.HW) != 0 {
// TODO Delete this debug
//log.Warning("[notForMiTM] [(%s) %s] ===> [%s (%s)]", eth.SrcMAC, ip4.SrcIP, ip4.DstIP, eth.DstMAC)
continue
}
if !ip4.SrcIP.Equal(target) && !ip4.DstIP.Equal(target) {
// TODO Delete this debug
//log.Warning("[notTarget] [(%s) %s] ===> [%s (%s)]", eth.SrcMAC, ip4.SrcIP, ip4.DstIP, eth.DstMAC)
continue
}
// log.Info("Got packet to route: %s\n", pkt.String())
if bytes.Compare(eth.SrcMAC, targetMAC) == 0 {
copy(eth.SrcMAC, p.Session.Interface.HW)
copy(ip4.SrcIP, p.Session.Interface.IP)
copy(eth.DstMAC, p.Session.Gateway.HW)
copy(ip4.DstIP, ip4.DstIP)
log.Info("Target is sending")
} else {
copy(eth.SrcMAC, p.Session.Interface.HW)
copy(ip4.SrcIP, p.Session.Interface.IP)
copy(eth.DstMAC, targetMAC)
copy(ip4.DstIP, target)
log.Info("Gatway is sending")
}
//log.Info("After: %s\n", pkt.String())
data := pkt.Data()
if err := p.Session.Queue.Send(data); err != nil {