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Listens to packets to find mac addresses
Unfortunately this implementation would require the user to run with root privileges.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package discovery | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/google/gopacket" | ||
| "github.com/google/gopacket/layers" | ||
| "github.com/google/gopacket/pcap" | ||
| "github.com/projectdiscovery/mapcidr" | ||
| "github.com/robgonnella/ops/internal/logger" | ||
| "github.com/robgonnella/ops/internal/server" | ||
| "github.com/robgonnella/ops/internal/util" | ||
| ) | ||
|
|
||
| type PCapScanner struct { | ||
| ctx context.Context | ||
| cancel context.CancelFunc | ||
| networkInfo *util.NetworkInfo | ||
| targets []string | ||
| handle *pcap.Handle | ||
| packetSource *gopacket.PacketSource | ||
| log logger.Logger | ||
| } | ||
|
|
||
| func NewPCapScanner( | ||
| targets []string, | ||
| networkInfo *util.NetworkInfo, | ||
| ) (*PCapScanner, error) { | ||
| ipList := []string{} | ||
|
|
||
| for _, t := range targets { | ||
| if cidrSuffix.MatchString(t) { | ||
| ips, err := mapcidr.IPAddresses(t) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| ipList = append(ipList, ips...) | ||
| } else { | ||
| ipList = append(ipList, t) | ||
| } | ||
| } | ||
|
|
||
| handle, err := pcap.OpenLive( | ||
| networkInfo.Interface.Name, | ||
| int32(networkInfo.Interface.MTU), | ||
| true, | ||
| pcap.BlockForever, | ||
| ) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| packetSource := gopacket.NewPacketSource(handle, layers.LinkTypeEthernet) | ||
|
|
||
| ctx, cancel := context.WithCancel(context.Background()) | ||
|
|
||
| return &PCapScanner{ | ||
| ctx: ctx, | ||
| cancel: cancel, | ||
| networkInfo: networkInfo, | ||
| targets: ipList, | ||
| handle: handle, | ||
| packetSource: packetSource, | ||
| log: logger.New(), | ||
| }, nil | ||
| } | ||
|
|
||
| func (s *PCapScanner) Stop() { | ||
| s.cancel() | ||
| s.handle.Close() | ||
| } | ||
|
|
||
| func (s *PCapScanner) ListenForPackets(res chan *server.Server) { | ||
| for packet := range s.packetSource.Packets() { | ||
| ipLayer := packet.Layer(layers.LayerTypeIPv4) | ||
| ethLayer := packet.Layer(layers.LayerTypeEthernet) | ||
|
|
||
| if ipLayer == nil || ethLayer == nil { | ||
| continue | ||
| } | ||
|
|
||
| ipv4 := ipLayer.(*layers.IPv4) | ||
| eth := ethLayer.(*layers.Ethernet) | ||
|
|
||
| if ipv4.SrcIP.Equal(s.networkInfo.UserIP) { | ||
| continue | ||
| } | ||
|
|
||
| srcIP := ipv4.SrcIP.String() | ||
| srcMAC := eth.SrcMAC.String() | ||
|
|
||
| if util.SliceIncludes(s.targets, srcIP) { | ||
| res <- &server.Server{IP: srcIP, MAC: srcMAC} | ||
| } | ||
| } | ||
| } |
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