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https://github.com/wader/fq.git
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7c5215347d
Remove bitio.Buffer layer. bitio.Buffer was a kitchen sink layer with helpers now it's just a buffer and most functions have been moved to decode instead. bitio package now only have primitive types and functions simialar to standard library io and bytes packages. Make nearly eveything internally use bitio.Bit* interfaces so that slicing work correctly this will also make it possible to start experimenting with more complicated silcing helpers, ex things like: breplace(.header.bitrate; 123) to get a new buffer with bitrate changed.
87 lines
2.6 KiB
Go
87 lines
2.6 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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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("flow", func(d *decode.D) {
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d.FieldValueStr("source_ip", s.ClientEndpoint.IP.String())
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d.FieldValueU("source_port", uint64(s.ClientEndpoint.Port), format.TCPPortMap)
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d.FieldValueStr("destination_ip", s.ServerEndpoint.IP.String())
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d.FieldValueU("destination_port", uint64(s.ServerEndpoint.Port), format.TCPPortMap)
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csBR := bitio.NewBitReader(s.ClientToServer.Bytes(), -1)
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if dv, _, _ := d.TryFieldFormatBitBuf(
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"client_stream",
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csBR,
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tcpStreamFormat,
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format.TCPStreamIn{
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SourcePort: s.ClientEndpoint.Port,
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DestinationPort: s.ServerEndpoint.Port,
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},
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); dv == nil {
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d.FieldRootBitBuf("client_stream", csBR)
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}
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scBR := bitio.NewBitReader(s.ServerToClient.Bytes(), -1)
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if dv, _, _ := d.TryFieldFormatBitBuf(
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"server_stream",
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scBR,
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tcpStreamFormat,
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format.TCPStreamIn{
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SourcePort: s.ClientEndpoint.Port,
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DestinationPort: s.ServerEndpoint.Port,
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},
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); dv == nil {
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d.FieldRootBitBuf("server_stream", scBR)
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}
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})
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}
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})
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}
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