mirror of
https://github.com/wader/fq.git
synced 2024-12-25 22:34:14 +03:00
97 lines
2.9 KiB
Go
97 lines
2.9 KiB
Go
package pcap
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import (
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"fmt"
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"github.com/wader/fq/format"
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"github.com/wader/fq/format/inet/flowsdecoder"
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"github.com/wader/fq/pkg/bitio"
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"github.com/wader/fq/pkg/decode"
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)
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var linkToDecodeFn = map[int]func(fd *flowsdecoder.Decoder, bs []byte) error{
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format.LinkTypeNULL: (*flowsdecoder.Decoder).LoopbackFrame,
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format.LinkTypeETHERNET: (*flowsdecoder.Decoder).EthernetFrame,
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format.LinkTypeLINUX_SLL: (*flowsdecoder.Decoder).SLLPacket,
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format.LinkTypeLINUX_SLL2: func(fd *flowsdecoder.Decoder, bs []byte) error {
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if len(bs) < 20 {
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// TODO: too short sll packet, error somehow?
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return fmt.Errorf("packet too short %d", len(bs))
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}
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// TODO: gopacket does not support SLL2 atm so convert SLL to SSL2
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nbs := []byte{
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0, bs[10], // packet type
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bs[8], bs[9], // arphdr
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0, bs[11], // link layer address length
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bs[12], bs[13], bs[14], bs[15], bs[16], bs[17], bs[18], bs[19], // link layer address
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bs[0], bs[1], // protocol type
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}
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nbs = append(nbs, bs[20:]...)
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return fd.SLLPacket(nbs)
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},
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}
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// TODO: make some of this shared if more packet capture formats are added
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func fieldFlows(d *decode.D, fd *flowsdecoder.Decoder, tcpStreamFormat decode.Group, ipv4PacketFormat decode.Group) {
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d.FieldArray("ipv4_reassembled", func(d *decode.D) {
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for _, p := range fd.IPV4Reassembled {
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br := bitio.NewBitReader(p.Datagram, -1)
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if dv, _, _ := d.TryFieldFormatBitBuf(
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"ipv4_packet",
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br,
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ipv4PacketFormat,
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nil,
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); dv == nil {
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d.FieldRootBitBuf("ipv4_packet", br)
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}
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}
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})
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d.FieldArray("tcp_connections", func(d *decode.D) {
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for _, s := range fd.TCPConnections {
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d.FieldStruct("tcp_connection", func(d *decode.D) {
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f := func(d *decode.D, td *flowsdecoder.TCPDirection, tsi format.TCPStreamIn) {
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d.FieldValueStr("ip", td.Endpoint.IP.String())
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d.FieldValueU("port", uint64(td.Endpoint.Port), format.TCPPortMap)
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d.FieldValueBool("has_start", td.HasStart)
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d.FieldValueBool("has_end", td.HasEnd)
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d.FieldValueU("skipped_bytes", td.SkippedBytes)
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br := bitio.NewBitReader(td.Buffer.Bytes(), -1)
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if dv, _, _ := d.TryFieldFormatBitBuf(
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"stream",
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br,
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tcpStreamFormat,
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tsi,
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); dv == nil {
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d.FieldRootBitBuf("stream", br)
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}
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}
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d.FieldStruct("client", func(d *decode.D) {
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f(d, &s.Client, format.TCPStreamIn{
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IsClient: true,
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HasStart: s.Client.HasStart,
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HasEnd: s.Client.HasEnd,
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SkippedBytes: s.Client.SkippedBytes,
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SourcePort: s.Client.Endpoint.Port,
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DestinationPort: s.Server.Endpoint.Port,
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})
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})
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d.FieldStruct("server", func(d *decode.D) {
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f(d, &s.Server, format.TCPStreamIn{
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IsClient: false,
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HasStart: s.Server.HasStart,
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HasEnd: s.Server.HasEnd,
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SkippedBytes: s.Server.SkippedBytes,
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SourcePort: s.Server.Endpoint.Port,
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DestinationPort: s.Client.Endpoint.Port,
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})
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})
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})
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}
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})
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}
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