diff options
author | Milan Lenco <milan.lenco@pantheon.tech> | 2017-10-11 16:40:58 +0200 |
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committer | Milan Lenco <milan.lenco@pantheon.tech> | 2017-10-13 08:40:37 +0200 |
commit | 3f1edad4e6ba0a7876750aea55507fae14d8badf (patch) | |
tree | a473997249d9ba7deb70b1076d14e4c4ed029a43 /vendor/github.com/google/gopacket/layers/prism.go | |
parent | 8b66677c2382a8e739d437621de4473d5ec0b9f1 (diff) |
ODPM 266: Go-libmemif + 2 examples.
Change-Id: Icdb9b9eb2314eff6c96afe7996fcf2728291de4a
Signed-off-by: Milan Lenco <milan.lenco@pantheon.tech>
Diffstat (limited to 'vendor/github.com/google/gopacket/layers/prism.go')
-rw-r--r-- | vendor/github.com/google/gopacket/layers/prism.go | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/vendor/github.com/google/gopacket/layers/prism.go b/vendor/github.com/google/gopacket/layers/prism.go new file mode 100644 index 0000000..e1711e7 --- /dev/null +++ b/vendor/github.com/google/gopacket/layers/prism.go @@ -0,0 +1,146 @@ +// Copyright 2015 Google, Inc. All rights reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the LICENSE file in the root of the source +// tree. + +// http://www.tcpdump.org/linktypes/LINKTYPE_IEEE802_11_PRISM.html + +package layers + +import ( + "encoding/binary" + "errors" + + "github.com/google/gopacket" +) + +func decodePrismValue(data []byte, pv *PrismValue) { + pv.DID = PrismDID(binary.LittleEndian.Uint32(data[0:4])) + pv.Status = binary.LittleEndian.Uint16(data[4:6]) + pv.Length = binary.LittleEndian.Uint16(data[6:8]) + pv.Data = data[8 : 8+pv.Length] +} + +type PrismDID uint32 + +const ( + PrismDIDType1HostTime PrismDID = 0x10044 + PrismDIDType2HostTime PrismDID = 0x01041 + PrismDIDType1MACTime PrismDID = 0x20044 + PrismDIDType2MACTime PrismDID = 0x02041 + PrismDIDType1Channel PrismDID = 0x30044 + PrismDIDType2Channel PrismDID = 0x03041 + PrismDIDType1RSSI PrismDID = 0x40044 + PrismDIDType2RSSI PrismDID = 0x04041 + PrismDIDType1SignalQuality PrismDID = 0x50044 + PrismDIDType2SignalQuality PrismDID = 0x05041 + PrismDIDType1Signal PrismDID = 0x60044 + PrismDIDType2Signal PrismDID = 0x06041 + PrismDIDType1Noise PrismDID = 0x70044 + PrismDIDType2Noise PrismDID = 0x07041 + PrismDIDType1Rate PrismDID = 0x80044 + PrismDIDType2Rate PrismDID = 0x08041 + PrismDIDType1TransmittedFrameIndicator PrismDID = 0x90044 + PrismDIDType2TransmittedFrameIndicator PrismDID = 0x09041 + PrismDIDType1FrameLength PrismDID = 0xA0044 + PrismDIDType2FrameLength PrismDID = 0x0A041 +) + +const ( + PrismType1MessageCode uint16 = 0x00000044 + PrismType2MessageCode uint16 = 0x00000041 +) + +func (p PrismDID) String() string { + dids := map[PrismDID]string{ + PrismDIDType1HostTime: "Host Time", + PrismDIDType2HostTime: "Host Time", + PrismDIDType1MACTime: "MAC Time", + PrismDIDType2MACTime: "MAC Time", + PrismDIDType1Channel: "Channel", + PrismDIDType2Channel: "Channel", + PrismDIDType1RSSI: "RSSI", + PrismDIDType2RSSI: "RSSI", + PrismDIDType1SignalQuality: "Signal Quality", + PrismDIDType2SignalQuality: "Signal Quality", + PrismDIDType1Signal: "Signal", + PrismDIDType2Signal: "Signal", + PrismDIDType1Noise: "Noise", + PrismDIDType2Noise: "Noise", + PrismDIDType1Rate: "Rate", + PrismDIDType2Rate: "Rate", + PrismDIDType1TransmittedFrameIndicator: "Transmitted Frame Indicator", + PrismDIDType2TransmittedFrameIndicator: "Transmitted Frame Indicator", + PrismDIDType1FrameLength: "Frame Length", + PrismDIDType2FrameLength: "Frame Length", + } + + if str, ok := dids[p]; ok { + return str + } + + return "Unknown DID" +} + +type PrismValue struct { + DID PrismDID + Status uint16 + Length uint16 + Data []byte +} + +func (pv *PrismValue) IsSupplied() bool { + return pv.Status == 1 +} + +var ErrPrismExpectedMoreData = errors.New("Expected more data.") +var ErrPrismInvalidCode = errors.New("Invalid header code.") + +func decodePrismHeader(data []byte, p gopacket.PacketBuilder) error { + d := &PrismHeader{} + return decodingLayerDecoder(d, data, p) +} + +type PrismHeader struct { + BaseLayer + Code uint16 + Length uint16 + DeviceName string + Values []PrismValue +} + +func (m *PrismHeader) LayerType() gopacket.LayerType { return LayerTypePrismHeader } + +func (m *PrismHeader) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + m.Code = binary.LittleEndian.Uint16(data[0:4]) + m.Length = binary.LittleEndian.Uint16(data[4:8]) + m.DeviceName = string(data[8:24]) + m.BaseLayer = BaseLayer{Contents: data[:m.Length], Payload: data[m.Length:len(data)]} + + switch m.Code { + case PrismType1MessageCode: + fallthrough + case PrismType2MessageCode: + // valid message code + default: + return ErrPrismInvalidCode + } + + offset := uint16(24) + + m.Values = make([]PrismValue, (m.Length-offset)/12) + for i := 0; i < len(m.Values); i++ { + decodePrismValue(data[offset:offset+12], &m.Values[i]) + offset += 12 + } + + if offset != m.Length { + return ErrPrismExpectedMoreData + } + + return nil +} + +func (m *PrismHeader) CanDecode() gopacket.LayerClass { return LayerTypePrismHeader } +func (m *PrismHeader) NextLayerType() gopacket.LayerType { return LayerTypeDot11 } |