88 lines
2.0 KiB
Go
88 lines
2.0 KiB
Go
package subcommands
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import (
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"bytes"
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"context"
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"encoding/binary"
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"flag"
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"io"
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"net"
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"os"
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"sync"
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"time"
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"github.com/bedrock-tool/bedrocktool/utils"
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"github.com/google/subcommands"
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"github.com/sandertv/gophertunnel/minecraft/protocol/packet"
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"github.com/sirupsen/logrus"
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)
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func init() {
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utils.RegisterCommand(&CaptureCMD{})
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}
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var dump_lock sync.Mutex
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func dump_packet(f io.WriteCloser, toServer bool, payload []byte) {
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dump_lock.Lock()
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defer dump_lock.Unlock()
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f.Write([]byte{0xAA, 0xAA, 0xAA, 0xAA})
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packet_size := uint32(len(payload))
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binary.Write(f, binary.LittleEndian, packet_size)
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binary.Write(f, binary.LittleEndian, toServer)
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_, err := f.Write(payload)
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if err != nil {
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logrus.Error(err)
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}
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f.Write([]byte{0xBB, 0xBB, 0xBB, 0xBB})
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}
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type CaptureCMD struct {
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server_address string
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}
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func (*CaptureCMD) Name() string { return "capture" }
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func (*CaptureCMD) Synopsis() string { return "capture packets in a pcap file" }
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func (p *CaptureCMD) SetFlags(f *flag.FlagSet) {
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f.StringVar(&p.server_address, "address", "", "remote server address")
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}
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func (c *CaptureCMD) Usage() string {
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return c.Name() + ": " + c.Synopsis() + "\n" + utils.SERVER_ADDRESS_HELP
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}
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func (c *CaptureCMD) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
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address, hostname, err := utils.ServerInput(ctx, c.server_address)
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if err != nil {
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logrus.Fatal(err)
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return 1
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}
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fio, err := os.Create(hostname + "-" + time.Now().Format("2006-01-02_15-04-05") + ".pcap2")
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if err != nil {
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logrus.Fatal(err)
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return 1
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}
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defer fio.Close()
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proxy := utils.NewProxy(logrus.StandardLogger())
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proxy.PacketFunc = func(header packet.Header, payload []byte, src, dst net.Addr) {
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from_client := src.String() == proxy.Client.LocalAddr().String()
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buf := bytes.NewBuffer(nil)
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header.Write(buf)
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buf.Write(payload)
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dump_packet(fio, from_client, buf.Bytes())
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}
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err = proxy.Run(ctx, address)
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time.Sleep(2 * time.Second)
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if err != nil {
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logrus.Fatal(err)
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return 1
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}
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return 0
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}
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