diff options
Diffstat (limited to 'vendor/github.com/google/gopacket/layers/ppp.go')
-rw-r--r-- | vendor/github.com/google/gopacket/layers/ppp.go | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/github.com/google/gopacket/layers/ppp.go b/vendor/github.com/google/gopacket/layers/ppp.go new file mode 100644 index 0000000..1d2e7b8 --- /dev/null +++ b/vendor/github.com/google/gopacket/layers/ppp.go @@ -0,0 +1,74 @@ +// Copyright 2012 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. + +package layers + +import ( + "encoding/binary" + "errors" + "github.com/google/gopacket" +) + +// PPP is the layer for PPP encapsulation headers. +type PPP struct { + BaseLayer + PPPType PPPType +} + +// PPPEndpoint is a singleton endpoint for PPP. Since there is no actual +// addressing for the two ends of a PPP connection, we use a singleton value +// named 'point' for each endpoint. +var PPPEndpoint = gopacket.NewEndpoint(EndpointPPP, nil) + +// PPPFlow is a singleton flow for PPP. Since there is no actual addressing for +// the two ends of a PPP connection, we use a singleton value to represent the +// flow for all PPP connections. +var PPPFlow = gopacket.NewFlow(EndpointPPP, nil, nil) + +// LayerType returns LayerTypePPP +func (p *PPP) LayerType() gopacket.LayerType { return LayerTypePPP } + +// LinkFlow returns PPPFlow. +func (p *PPP) LinkFlow() gopacket.Flow { return PPPFlow } + +func decodePPP(data []byte, p gopacket.PacketBuilder) error { + ppp := &PPP{} + if data[0]&0x1 == 0 { + if data[1]&0x1 == 0 { + return errors.New("PPP has invalid type") + } + ppp.PPPType = PPPType(binary.BigEndian.Uint16(data[:2])) + ppp.Contents = data[:2] + ppp.Payload = data[2:] + } else { + ppp.PPPType = PPPType(data[0]) + ppp.Contents = data[:1] + ppp.Payload = data[1:] + } + p.AddLayer(ppp) + p.SetLinkLayer(ppp) + return p.NextDecoder(ppp.PPPType) +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (p *PPP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + if p.PPPType&0x100 == 0 { + bytes, err := b.PrependBytes(2) + if err != nil { + return err + } + binary.BigEndian.PutUint16(bytes, uint16(p.PPPType)) + } else { + bytes, err := b.PrependBytes(1) + if err != nil { + return err + } + bytes[0] = uint8(p.PPPType) + } + return nil +} |