/
queue.go
254 lines (211 loc) · 5.31 KB
/
queue.go
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package packets
import (
"encoding/json"
"fmt"
"net"
"sync"
"sync/atomic"
"github.com/bettercap/bettercap/network"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
)
type Activity struct {
IP net.IP
MAC net.HardwareAddr
Meta map[string]string
Source bool
}
type Traffic struct {
Sent uint64 `json:"sent"`
Received uint64 `json:"received"`
}
type Stats struct {
Sent uint64 `json:"sent"`
Received uint64 `json:"received"`
PktReceived uint64 `json:"pkts_received"`
Errors uint64 `json:"errors"`
}
type Queue struct {
sync.RWMutex
// keep on top because of https://github.com/bettercap/bettercap/issues/500
Stats Stats
Protos sync.Map
Traffic sync.Map
Activities chan Activity
iface *network.Endpoint
handle *pcap.Handle
source *gopacket.PacketSource
srcChannel chan gopacket.Packet
writes *sync.WaitGroup
active bool
}
type queueJSON struct {
Stats Stats `json:"stats"`
Protos map[string]int `json:"protos"`
Traffic map[string]*Traffic `json:"traffic"`
}
func NewQueue(iface *network.Endpoint) (q *Queue, err error) {
q = &Queue{
Protos: sync.Map{},
Traffic: sync.Map{},
Stats: Stats{},
Activities: make(chan Activity),
writes: &sync.WaitGroup{},
iface: iface,
active: !iface.IsMonitor(),
}
if q.active {
if q.handle, err = pcap.OpenLive(iface.Name(), 1024, true, pcap.BlockForever); err != nil {
return
}
q.source = gopacket.NewPacketSource(q.handle, q.handle.LinkType())
q.srcChannel = q.source.Packets()
go q.worker()
}
return
}
func (q *Queue) MarshalJSON() ([]byte, error) {
q.Lock()
defer q.Unlock()
doc := queueJSON{
Stats: q.Stats,
Protos: make(map[string]int),
Traffic: make(map[string]*Traffic),
}
q.Protos.Range(func(k, v interface{}) bool {
doc.Protos[k.(string)] = v.(int)
return true
})
q.Traffic.Range(func(k, v interface{}) bool {
doc.Traffic[k.(string)] = v.(*Traffic)
return true
})
return json.Marshal(doc)
}
func (q *Queue) trackProtocols(pkt gopacket.Packet) {
// gather protocols stats
pktLayers := pkt.Layers()
for _, layer := range pktLayers {
proto := layer.LayerType()
if proto == gopacket.LayerTypeDecodeFailure || proto == gopacket.LayerTypePayload {
continue
}
name := proto.String()
if v, found := q.Protos.Load(name); !found {
q.Protos.Store(name, 1)
} else {
q.Protos.Store(name, v.(int)+1)
}
}
}
func (q *Queue) trackActivity(eth *layers.Ethernet, ip4 *layers.IPv4, address net.IP, meta map[string]string, pktSize uint64, isSent bool) {
// push to activity channel
q.Activities <- Activity{
IP: address,
MAC: eth.SrcMAC,
Meta: meta,
Source: isSent,
}
// initialize or update stats
addr := address.String()
if v, found := q.Traffic.Load(addr); !found {
if isSent {
q.Traffic.Store(addr, &Traffic{Sent: pktSize})
} else {
q.Traffic.Store(addr, &Traffic{Received: pktSize})
}
} else {
if isSent {
v.(*Traffic).Sent += pktSize
} else {
v.(*Traffic).Received += pktSize
}
}
}
func (q *Queue) TrackPacket(size uint64) {
// https://github.com/bettercap/bettercap/issues/500
if q == nil {
panic("track packet on nil queue!")
}
atomic.AddUint64(&q.Stats.PktReceived, 1)
atomic.AddUint64(&q.Stats.Received, size)
}
func (q *Queue) TrackSent(size uint64) {
atomic.AddUint64(&q.Stats.Sent, size)
}
func (q *Queue) TrackError() {
atomic.AddUint64(&q.Stats.Errors, 1)
}
func (q *Queue) getPacketMeta(pkt gopacket.Packet) map[string]string {
meta := make(map[string]string)
if mdns := MDNSGetMeta(pkt); mdns != nil {
meta = mdns
} else if nbns := NBNSGetMeta(pkt); nbns != nil {
meta = nbns
} else if upnp := UPNPGetMeta(pkt); upnp != nil {
meta = upnp
}
return meta
}
func (q *Queue) worker() {
for pkt := range q.srcChannel {
if !q.active {
return
}
q.trackProtocols(pkt)
pktSize := uint64(len(pkt.Data()))
q.TrackPacket(pktSize)
// decode eth and ipv4 layers
leth := pkt.Layer(layers.LayerTypeEthernet)
lip4 := pkt.Layer(layers.LayerTypeIPv4)
if leth != nil && lip4 != nil {
eth := leth.(*layers.Ethernet)
ip4 := lip4.(*layers.IPv4)
// here we try to discover new hosts
// on this lan by inspecting packets
// we manage to sniff
// something coming from someone on the LAN
isFromMe := q.iface.IP.Equal(ip4.SrcIP)
isFromLAN := q.iface.Net.Contains(ip4.SrcIP)
if !isFromMe && isFromLAN {
meta := q.getPacketMeta(pkt)
q.trackActivity(eth, ip4, ip4.SrcIP, meta, pktSize, true)
}
// something going to someone on the LAN
isToMe := q.iface.IP.Equal(ip4.DstIP)
isToLAN := q.iface.Net.Contains(ip4.DstIP)
if !isToMe && isToLAN {
q.trackActivity(eth, ip4, ip4.DstIP, nil, pktSize, false)
}
}
}
}
func (q *Queue) Send(raw []byte) error {
q.Lock()
defer q.Unlock()
if !q.active {
return fmt.Errorf("Packet queue is not active.")
}
q.writes.Add(1)
defer q.writes.Done()
if err := q.handle.WritePacketData(raw); err != nil {
q.TrackError()
return err
} else {
q.TrackSent(uint64(len(raw)))
}
return nil
}
func (q *Queue) Stop() {
q.Lock()
defer q.Unlock()
if q.active {
// wait for write operations to be completed
q.writes.Wait()
// signal the main loop to exit and close the handle
q.active = false
q.srcChannel <- nil
q.handle.Close()
}
}