mirror of
https://github.com/wader/fq.git
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390 lines
13 KiB
Go
390 lines
13 KiB
Go
package pcap
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// https://pcapng.github.io/pcapng/draft-ietf-opsawg-pcapng.html
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import (
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"encoding/binary"
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"net"
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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/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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)
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var pcapngLinkFrameFormat decode.Group
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var pcapngTCPStreamFormat decode.Group
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var pcapngIPvPacket4Format decode.Group
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func init() {
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interp.RegisterFormat(decode.Format{
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Name: format.PCAPNG,
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Description: "PCAPNG packet capture",
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RootArray: true,
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Groups: []string{format.PROBE},
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Dependencies: []decode.Dependency{
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{Names: []string{format.LINK_FRAME}, Group: &pcapngLinkFrameFormat},
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{Names: []string{format.TCP_STREAM}, Group: &pcapngTCPStreamFormat},
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{Names: []string{format.IPV4_PACKET}, Group: &pcapngIPvPacket4Format},
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},
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DecodeFn: decodePcapng,
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})
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}
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const (
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ngBigEndian = 0x1a2b3c4d
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ngLittleEndian = 0x4d3c2b1a
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)
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var ngEndianMap = scalar.UintMapSymStr{
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ngBigEndian: "big_endian",
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ngLittleEndian: "little_endian",
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}
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const (
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blockTypeSectionHeader = 0x0a0d0d0a
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blockTypeInterfaceDescription = 0x00000001
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blockTypeNameResolution = 0x00000004
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blockTypeInterfaceStatistics = 0x00000005
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blockTypeEnhancedPacketBlock = 0x00000006
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)
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// from https://pcapng.github.io/pcapng/draft-ietf-opsawg-pcapng.html#section_block_code_registry
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var blockTypeMap = scalar.UintMap{
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blockTypeInterfaceDescription: {Sym: "interface_description", Description: "Interface Description Block"},
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0x00000002: {Description: "Packet Block"},
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0x00000003: {Description: "Simple Packet Block"},
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blockTypeNameResolution: {Sym: "name_resolution", Description: "Name Resolution Block"},
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blockTypeInterfaceStatistics: {Sym: "interface_statistics", Description: "Interface Statistics Block"},
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blockTypeEnhancedPacketBlock: {Sym: "enhanced_packet", Description: "Enhanced Packet Block"},
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0x00000007: {Description: "IRIG Timestamp Block"},
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0x00000008: {Description: "ARINC 429 in AFDX Encapsulation Information Block"},
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0x00000009: {Description: "systemd Journal Export Block"},
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0x0000000a: {Description: "Decryption Secrets Block"},
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0x00000101: {Description: "Hone Project Machine Info Block"},
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0x00000102: {Description: "Hone Project Connection Event Block"},
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0x00000201: {Description: "Sysdig Machine Info Block"},
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0x00000202: {Description: "Sysdig Process Info Block, version 1"},
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0x00000203: {Description: "Sysdig FD List Block"},
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0x00000204: {Description: "Sysdig Event Block"},
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0x00000205: {Description: "Sysdig Interface List Block"},
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0x00000206: {Description: "Sysdig User List Block"},
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0x00000207: {Description: "Sysdig Process Info Block, version 2"},
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0x00000208: {Description: "Sysdig Event Block with flags"},
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0x00000209: {Description: "Sysdig Process Info Block, version 3"},
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0x00000210: {Description: "Sysdig Process Info Block, version 4"},
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0x00000211: {Description: "Sysdig Process Info Block, version 5"},
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0x00000212: {Description: "Sysdig Process Info Block, version 6"},
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0x00000213: {Description: "Sysdig Process Info Block, version 7"},
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0x00000bad: {Description: "Custom Block that rewriters can copy into new files"},
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0x40000bad: {Description: "Custom Block that rewriters should not copy into new files"},
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blockTypeSectionHeader: {Sym: "section_header", Description: "Section Header Block"},
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}
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const (
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optionEnd = 0
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optionComment = 1
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sectionHeaderOptionHardware = 2
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sectionHeaderOptionOS = 3
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sectionHeaderOptionUserAppl = 4
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interfaceDescriptionName = 2
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interfaceDescriptionDescription = 3
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interfaceDescriptionIPv4addr = 4
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interfaceDescriptionMACaddr = 6
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interfaceDescriptionEUIaddr = 7
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interfaceDescriptionSpeed = 8
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interfaceDescriptionTsresol = 9
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interfaceDescriptionTzone = 10
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interfaceDescriptionFilter = 11
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interfaceDescriptionOS = 12
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interfaceDescriptionFcslen = 13
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interfaceDescriptionTsoffset = 14
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enhancedPacketFlags = 2
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enhancedPacketHash = 3
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enhancedPacketDropcount = 4
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nameResolutionDNSName = 2
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nameResolutionDNSIP4addr = 3
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nameResolutionDNSIP6addr = 4
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interfaceStatisticsStarttime = 2
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interfaceStatisticsEndtime = 3
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interfaceStatisticsIfRecv = 4
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interfaceStatisticsIfDrop = 5
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interfaceStatisticsFilterAccept = 6
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interfaceStatisticsOSDrop = 7
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interfaceStatisticsUsrdeliv = 8
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)
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var sectionHeaderOptionsMap = scalar.UintMap{
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optionEnd: {Sym: "end", Description: "End of options"},
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optionComment: {Sym: "comment", Description: "Comment"},
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sectionHeaderOptionHardware: {Sym: "hardware"},
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sectionHeaderOptionOS: {Sym: "os"},
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sectionHeaderOptionUserAppl: {Sym: "userappl"},
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}
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var interfaceDescriptionOptionsMap = scalar.UintMap{
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optionEnd: {Sym: "end", Description: "End of options"},
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optionComment: {Sym: "comment", Description: "Comment"},
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interfaceDescriptionName: {Sym: "name"},
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interfaceDescriptionDescription: {Sym: "description"},
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interfaceDescriptionIPv4addr: {Sym: "ipv4addr"},
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interfaceDescriptionMACaddr: {Sym: "macaddr"},
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interfaceDescriptionEUIaddr: {Sym: "euiaddr"},
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interfaceDescriptionSpeed: {Sym: "speed"},
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interfaceDescriptionTsresol: {Sym: "tsresol"},
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interfaceDescriptionTzone: {Sym: "tzone"},
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interfaceDescriptionFilter: {Sym: "filter"},
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interfaceDescriptionOS: {Sym: "os"},
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interfaceDescriptionFcslen: {Sym: "fcslen"},
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interfaceDescriptionTsoffset: {Sym: "tsoffset"},
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}
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var enhancedPacketOptionsMap = scalar.UintMap{
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optionEnd: {Sym: "end", Description: "End of options"},
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optionComment: {Sym: "comment", Description: "Comment"},
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enhancedPacketFlags: {Sym: "flags"},
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enhancedPacketHash: {Sym: "hash"},
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enhancedPacketDropcount: {Sym: "dropcount"},
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}
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var nameResolutionOptionsMap = scalar.UintMap{
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optionEnd: {Sym: "end", Description: "End of options"},
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optionComment: {Sym: "comment", Description: "Comment"},
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nameResolutionDNSName: {Sym: "dnsname"},
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nameResolutionDNSIP4addr: {Sym: "dnsip4addr"},
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nameResolutionDNSIP6addr: {Sym: "dnsip6addr"},
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}
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var interfaceStatisticsOptionsMap = scalar.UintMap{
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optionEnd: {Sym: "end", Description: "End of options"},
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optionComment: {Sym: "comment", Description: "Comment"},
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interfaceStatisticsStarttime: {Sym: "starttime"},
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interfaceStatisticsEndtime: {Sym: "endtime"},
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interfaceStatisticsIfRecv: {Sym: "ifrecv"},
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interfaceStatisticsIfDrop: {Sym: "ifdrop"},
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interfaceStatisticsFilterAccept: {Sym: "filteraccept"},
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interfaceStatisticsOSDrop: {Sym: "osdrop"},
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interfaceStatisticsUsrdeliv: {Sym: "usrdeliv"},
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}
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const (
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nameResolutionRecordEnd = 0x0000
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nameResolutionRecordIpv4 = 0x0001
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nameResolutionRecordIpv6 = 0x0002
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)
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var nameResolutionRecordMap = scalar.UintMapSymStr{
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nameResolutionRecordEnd: "end",
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nameResolutionRecordIpv4: "ipv4",
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nameResolutionRecordIpv6: "ipv6",
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}
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func decoodeOptions(d *decode.D, opts scalar.UintMap) {
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if d.BitsLeft() < 32 {
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return
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}
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seenEnd := false
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for !seenEnd {
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d.FieldStruct("option", func(d *decode.D) {
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code := d.FieldU16("code", opts)
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length := d.FieldU16("length")
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if code == optionEnd {
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seenEnd = true
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return
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}
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d.FieldUTF8NullFixedLen("value", int(length))
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d.FieldRawLen("padding", int64(d.AlignBits(32)))
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})
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}
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}
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// TODO: share
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var mapUToIPv4Sym = scalar.UintFn(func(s scalar.Uint) (scalar.Uint, error) {
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var b [4]byte
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binary.BigEndian.PutUint32(b[:], uint32(s.Actual))
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s.Sym = net.IP(b[:]).String()
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return s, nil
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})
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var blockFns = map[uint64]func(d *decode.D, dc *decodeContext){
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// TODO: SimplePacket
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// TODO: Packet
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blockTypeInterfaceDescription: func(d *decode.D, dc *decodeContext) {
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typ := d.FieldU16("link_type", format.LinkTypeMap)
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d.FieldU16("reserved")
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d.FieldU32("snap_len")
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d.FieldArray("options", func(d *decode.D) { decoodeOptions(d, interfaceDescriptionOptionsMap) })
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dc.interfaceTypes[len(dc.interfaceTypes)] = int(typ)
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},
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blockTypeEnhancedPacketBlock: func(d *decode.D, dc *decodeContext) {
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interfaceID := d.FieldU32("interface_id")
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d.FieldU32("timestamp_high")
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d.FieldU32("timestamp_low")
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capturedLength := d.FieldU32("capture_packet_length")
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d.FieldU32("original_packet_length")
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bs := d.ReadAllBits(d.BitBufRange(d.Pos(), int64(capturedLength)*8))
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linkType := dc.interfaceTypes[int(interfaceID)]
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if fn, ok := linkToDecodeFn[linkType]; ok {
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// TODO: report decode errors
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_ = fn(dc.flowDecoder, bs)
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}
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d.FieldFormatOrRawLen(
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"packet",
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int64(capturedLength)*8,
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pcapngLinkFrameFormat,
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format.LinkFrameIn{
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Type: linkType,
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IsLittleEndian: d.Endian == decode.LittleEndian,
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},
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)
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d.FieldRawLen("padding", int64(d.AlignBits(32)))
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d.FieldArray("options", func(d *decode.D) { decoodeOptions(d, enhancedPacketOptionsMap) })
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},
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blockTypeNameResolution: func(d *decode.D, _ *decodeContext) {
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seenEnd := false
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d.FieldArray("records", func(d *decode.D) {
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for !seenEnd {
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d.FieldStruct("record", func(d *decode.D) {
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typ := d.FieldU16("type", nameResolutionRecordMap)
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length := d.FieldU16("length")
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if typ == nameResolutionRecordEnd {
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seenEnd = true
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return
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}
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d.FramedFn(int64(length)*8, func(d *decode.D) {
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switch typ {
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case nameResolutionRecordIpv4:
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d.FieldU32BE("address", mapUToIPv4Sym, scalar.UintHex)
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d.FieldArray("entries", func(d *decode.D) {
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for !d.End() {
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d.FieldUTF8Null("string")
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}
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})
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default:
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d.FieldUTF8NullFixedLen("value", int(d.BitsLeft()/8))
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}
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})
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d.FieldRawLen("padding", int64(d.AlignBits(32)))
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})
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}
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})
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d.FieldArray("options", func(d *decode.D) { decoodeOptions(d, nameResolutionOptionsMap) })
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},
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blockTypeInterfaceStatistics: func(d *decode.D, _ *decodeContext) {
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d.FieldU32("interface_id")
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d.FieldU32("timestamp_high")
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d.FieldU32("timestamp_low")
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d.FieldRawLen("padding", int64(d.AlignBits(32)))
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d.FieldArray("options", func(d *decode.D) { decoodeOptions(d, interfaceStatisticsOptionsMap) })
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},
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}
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func decodeBlock(d *decode.D, dc *decodeContext) {
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typ := d.FieldU32("type", blockTypeMap, scalar.UintHex)
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length := d.FieldU32("length") - 8
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const footerLengthSize = 32
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blockLen := int64(length)*8 - footerLengthSize
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if blockLen <= 0 {
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d.Fatalf("%d blockLen < 0", blockLen)
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}
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d.FramedFn(blockLen, func(d *decode.D) {
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if fn, ok := blockFns[typ]; ok {
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fn(d, dc)
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} else {
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d.FieldRawLen("data", d.BitsLeft())
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}
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})
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d.FieldU32("footer_length")
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}
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func decodeSection(d *decode.D, dc *decodeContext) {
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d.FieldArray("blocks", func(d *decode.D) {
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sectionLength := int64(-1)
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sectionD := d
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sectionStart := d.Pos()
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// treat header block differently as it has endian info
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d.FieldStruct("block", func(d *decode.D) {
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d.FieldU32("type", d.UintAssert(blockTypeSectionHeader), blockTypeMap, scalar.UintHex)
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d.SeekRel(32)
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endian := d.FieldU32("byte_order_magic", ngEndianMap, scalar.UintHex)
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// peeks length and byte-order magic and marks away length
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switch endian {
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case ngBigEndian:
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d.Endian = decode.BigEndian
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case ngLittleEndian:
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d.Endian = decode.LittleEndian
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default:
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d.Fatalf("unknown endian %d", endian)
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}
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sectionD.Endian = d.Endian
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d.SeekRel(-64)
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length := d.FieldU32("length") - 8 - 4
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d.SeekRel(32)
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d.FramedFn(int64(length)*8, func(d *decode.D) {
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d.FieldU16("major_version")
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d.FieldU16("minor_version")
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sectionLength = d.FieldS64("section_length")
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d.FramedFn(d.BitsLeft()-32, func(d *decode.D) {
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d.FieldArray("options", func(d *decode.D) { decoodeOptions(d, sectionHeaderOptionsMap) })
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})
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d.FieldU32("footer_total_length")
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})
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dc.sectionHeaderFound = true
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})
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for (sectionLength == -1 && !d.End()) ||
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(sectionLength != -1 && d.Pos()-sectionStart < sectionLength*8) {
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d.FieldStruct("block", func(d *decode.D) { decodeBlock(d, dc) })
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}
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})
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}
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type decodeContext struct {
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sectionHeaderFound bool
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interfaceTypes map[int]int
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flowDecoder *flowsdecoder.Decoder
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}
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func decodePcapng(d *decode.D, _ any) any {
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sectionHeaders := 0
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for !d.End() {
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fd := flowsdecoder.New(flowsdecoder.DecoderOptions{CheckTCPOptions: false})
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dc := decodeContext{
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interfaceTypes: map[int]int{},
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flowDecoder: fd,
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}
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d.FieldStruct("section", func(d *decode.D) {
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decodeSection(d, &dc)
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fd.Flush()
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fieldFlows(d, dc.flowDecoder, pcapngTCPStreamFormat, pcapngIPvPacket4Format)
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})
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if dc.sectionHeaderFound {
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sectionHeaders++
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}
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}
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if sectionHeaders == 0 {
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d.Fatalf("no section headers found")
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}
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return nil
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}
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