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

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This commit is contained in:
evilsocket 2018-02-15 20:03:42 +01:00
parent c744875136
commit 3832cafd20
1 changed files with 15 additions and 27 deletions
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42
modules/arp_spoof.go
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@ -143,44 +143,34 @@ func (p *ArpSpoofer) pktRouter(eth *layers.Ethernet, ip4 *layers.IPv4, pkt gopac
if eth == nil || ip4 == nil {
return
}
// If DST_MAC is not our Interface.IP ignore
if bytes.Compare(eth.DstMAC, p.Session.Interface.HW) != 0 {
return
}
// 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)
// packet not from/to this target
if !ip4.SrcIP.Equal(target) && !ip4.DstIP.Equal(target) {
continue
}
targetMAC, err := p.getMAC(target, false)
if err != nil {
log.Error("Error retrieving target MAC address for %s", target.String(), err)
return
continue
}
isEthFromTarget := bytes.Compare(eth.SrcMAC, targetMAC) == 0
// 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
}
// 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)
if isEthFromTarget == false && bytes.Compare(eth.SrcMAC, p.Session.Gateway.HW) != 0 {
continue
}
// log.Info("Got packet to route: %s\n", pkt.String())
if bytes.Compare(eth.SrcMAC, targetMAC) == 0 {
if isEthFromTarget {
copy(eth.SrcMAC, p.Session.Interface.HW)
copy(ip4.SrcIP, p.Session.Interface.IP)
copy(eth.DstMAC, p.Session.Gateway.HW)
@ -193,11 +183,9 @@ func (p *ArpSpoofer) pktRouter(eth *layers.Ethernet, ip4 *layers.IPv4, pkt gopac
copy(eth.DstMAC, targetMAC)
copy(ip4.DstIP, target)
log.Info("Gatway is sending")
log.Info("Gateway is sending")
}
//log.Info("After: %s\n", pkt.String())
data := pkt.Data()
if err := p.Session.Queue.Send(data); err != nil {
log.Error("Could not reinject packet: %s", err)