mirror of
https://github.com/gravitl/netmaker.git
synced 2024-09-22 08:16:07 +08:00
238 lines
6.3 KiB
Go
238 lines
6.3 KiB
Go
package proxy
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import (
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"context"
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"errors"
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"fmt"
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"log"
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"net"
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"time"
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"github.com/google/gopacket"
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"github.com/google/gopacket/layers"
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"github.com/google/gopacket/pcap"
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"github.com/gravitl/netmaker/nm-proxy/common"
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"github.com/gravitl/netmaker/nm-proxy/wg"
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"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
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)
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const (
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defaultBodySize = 10000
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defaultPort = 51722
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)
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type Config struct {
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Port int
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BodySize int
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Addr string
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RemoteKey string
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LocalKey string
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WgInterface *wg.WGIface
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AllowedIps []net.IPNet
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PreSharedKey *wgtypes.Key
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}
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// Proxy - WireguardProxy proxies
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type Proxy struct {
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Ctx context.Context
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Cancel context.CancelFunc
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Config Config
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RemoteConn *net.UDPAddr
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LocalConn net.Conn
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}
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func GetInterfaceIpv4Addr(interfaceName string) (addr string, err error) {
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var (
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ief *net.Interface
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addrs []net.Addr
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ipv4Addr net.IP
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)
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if ief, err = net.InterfaceByName(interfaceName); err != nil { // get interface
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return
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}
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if addrs, err = ief.Addrs(); err != nil { // get addresses
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return
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}
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for _, addr := range addrs { // get ipv4 address
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if ipv4Addr = addr.(*net.IPNet).IP.To4(); ipv4Addr != nil {
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break
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}
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}
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if ipv4Addr == nil {
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return "", errors.New(fmt.Sprintf("interface %s don't have an ipv4 address\n", interfaceName))
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}
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return ipv4Addr.String(), nil
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}
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func GetInterfaceListenAddr(port int) (*net.UDPAddr, error) {
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locallistenAddr := "127.0.0.1"
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udpAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", locallistenAddr, port))
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if err != nil {
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return udpAddr, err
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}
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if !common.IsHostNetwork {
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addrs, err := getBoardCastAddress()
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if err != nil {
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return udpAddr, err
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}
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for _, addr := range addrs {
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if liAddr := addr.(*net.IPNet).IP; liAddr != nil {
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udpAddr.IP = liAddr
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break
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}
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}
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}
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return udpAddr, nil
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}
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func getBoardCastAddress() ([]net.Addr, error) {
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localnets, err := net.Interfaces()
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if err != nil {
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return nil, err
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}
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var (
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ief net.Interface
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addrs []net.Addr
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)
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for _, ief = range localnets {
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if ief.Flags&net.FlagBroadcast != 0 && ief.Flags&net.FlagUp != 0 {
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addrs, err = ief.Addrs()
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if err == nil {
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return addrs, nil
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}
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}
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}
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return nil, errors.New("couldn't obtain the broadcast addr")
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}
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func StartSniffer(ctx context.Context, ifaceName, extClientAddr string, port int) {
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log.Println("Starting Packet Sniffer for iface: ", ifaceName)
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var (
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snapshotLen int32 = 1024
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promiscuous bool = false
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err error
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timeout time.Duration = 1 * time.Microsecond
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handle *pcap.Handle
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)
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// Open device
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handle, err = pcap.OpenLive(ifaceName, snapshotLen, promiscuous, timeout)
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if err != nil {
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log.Println("failed to start sniffer for iface: ", ifaceName, err)
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return
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}
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// if err := handle.SetBPFFilter(fmt.Sprintf("src %s and port %d", extClientAddr, port)); err != nil {
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// log.Println("failed to set bpf filter: ", err)
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// return
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// }
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defer handle.Close()
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// var tcp layers.TCP
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// var icmp layers.ICMPv4
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// var udp layers.UDP
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// parser := gopacket.NewDecodingLayerParser(layers.LayerTypeIPv4, &udp, &tcp, &icmp)
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packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
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for {
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select {
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case <-ctx.Done():
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log.Println("Stopping packet sniffer for iface: ", ifaceName, " port: ", port)
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return
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default:
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packet, err := packetSource.NextPacket()
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if err == nil {
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//processPkt(ifaceName, packet)
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ipLayer := packet.Layer(layers.LayerTypeIPv4)
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if ipLayer != nil {
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fmt.Println("IPv4 layer detected.")
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ip, _ := ipLayer.(*layers.IPv4)
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// IP layer variables:
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// Version (Either 4 or 6)
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// IHL (IP Header Length in 32-bit words)
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// TOS, Length, Id, Flags, FragOffset, TTL, Protocol (TCP?),
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// Checksum, SrcIP, DstIP
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fmt.Println("#########################")
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fmt.Printf("From %s to %s\n", ip.SrcIP, ip.DstIP)
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fmt.Println("Protocol: ", ip.Protocol)
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if ifacePeers, ok := common.PeerAddrMap[ifaceName]; ok {
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if peerConf, ok := ifacePeers[ip.DstIP.String()]; ok {
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log.Println("-----> Fowarding PKT From ExtClient: ", extClientAddr, " to: ", peerConf.Config.RemoteProxyIP)
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//server.NmProxyServer.Server.WriteTo(packet.Data(), )
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}
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}
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fmt.Println("#########################")
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}
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}
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}
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}
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}
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func processPkt(iface string, packet gopacket.Packet) {
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// Let's see if the packet is an ethernet packet
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// ethernetLayer := packet.Layer(layers.LayerTypeEthernet)
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// if ethernetLayer != nil {
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// fmt.Println("Ethernet layer detected.")
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// ethernetPacket, _ := ethernetLayer.(*layers.Ethernet)
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// fmt.Println("Source MAC: ", ethernetPacket.SrcMAC)
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// fmt.Println("Destination MAC: ", ethernetPacket.DstMAC)
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// // Ethernet type is typically IPv4 but could be ARP or other
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// fmt.Println("Ethernet type: ", ethernetPacket.EthernetType)
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// fmt.Println()
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// }
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// Let's see if the packet is IP (even though the ether type told us)
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ipLayer := packet.Layer(layers.LayerTypeIPv4)
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if ipLayer != nil {
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fmt.Println("IPv4 layer detected.")
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ip, _ := ipLayer.(*layers.IPv4)
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// IP layer variables:
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// Version (Either 4 or 6)
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// IHL (IP Header Length in 32-bit words)
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// TOS, Length, Id, Flags, FragOffset, TTL, Protocol (TCP?),
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// Checksum, SrcIP, DstIP
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fmt.Printf("From %s to %s\n", ip.SrcIP, ip.DstIP)
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fmt.Println("Protocol: ", ip.Protocol)
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fmt.Println()
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}
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// udpLayer := packet.Layer(layers.LayerTypeUDP)
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// if udpLayer != nil {
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// udp, _ := udpLayer.(*layers.UDP)
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// fmt.Printf("UDP: From port %d to %d\n", udp.SrcPort, udp.DstPort)
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// fmt.Println()
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// }
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// // Iterate over all layers, printing out each layer type
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// fmt.Println("All packet layers:")
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// for _, layer := range packet.Layers() {
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// fmt.Println("- ", layer.LayerType())
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// }
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// When iterating through packet.Layers() above,
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// if it lists Payload layer then that is the same as
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// this applicationLayer. applicationLayer contains the payload
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// applicationLayer := packet.ApplicationLayer()
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// if applicationLayer != nil {
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// fmt.Println("Application layer/Payload found.")
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// fmt.Printf("%s\n", applicationLayer.Payload())
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// // Search for a string inside the payload
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// if strings.Contains(string(applicationLayer.Payload()), "HTTP") {
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// fmt.Println("HTTP found!")
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// }
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// }
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// Check for errors
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if err := packet.ErrorLayer(); err != nil {
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fmt.Println("Error decoding some part of the packet:", err)
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}
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}
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