diff options
Diffstat (limited to 'vendor/golang.org/x/net/icmp/paramprob.go')
-rw-r--r-- | vendor/golang.org/x/net/icmp/paramprob.go | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/vendor/golang.org/x/net/icmp/paramprob.go b/vendor/golang.org/x/net/icmp/paramprob.go new file mode 100644 index 000000000..0a2548daa --- /dev/null +++ b/vendor/golang.org/x/net/icmp/paramprob.go @@ -0,0 +1,63 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package icmp + +import ( + "encoding/binary" + "golang.org/x/net/internal/iana" +) + +// A ParamProb represents an ICMP parameter problem message body. +type ParamProb struct { + Pointer uintptr // offset within the data where the error was detected + Data []byte // data, known as original datagram field + Extensions []Extension // extensions +} + +// Len implements the Len method of MessageBody interface. +func (p *ParamProb) Len(proto int) int { + if p == nil { + return 0 + } + l, _ := multipartMessageBodyDataLen(proto, p.Data, p.Extensions) + return 4 + l +} + +// Marshal implements the Marshal method of MessageBody interface. +func (p *ParamProb) Marshal(proto int) ([]byte, error) { + if proto == iana.ProtocolIPv6ICMP { + b := make([]byte, p.Len(proto)) + binary.BigEndian.PutUint32(b[:4], uint32(p.Pointer)) + copy(b[4:], p.Data) + return b, nil + } + b, err := marshalMultipartMessageBody(proto, p.Data, p.Extensions) + if err != nil { + return nil, err + } + b[0] = byte(p.Pointer) + return b, nil +} + +// parseParamProb parses b as an ICMP parameter problem message body. +func parseParamProb(proto int, b []byte) (MessageBody, error) { + if len(b) < 4 { + return nil, errMessageTooShort + } + p := &ParamProb{} + if proto == iana.ProtocolIPv6ICMP { + p.Pointer = uintptr(binary.BigEndian.Uint32(b[:4])) + p.Data = make([]byte, len(b)-4) + copy(p.Data, b[4:]) + return p, nil + } + p.Pointer = uintptr(b[0]) + var err error + p.Data, p.Extensions, err = parseMultipartMessageBody(proto, b) + if err != nil { + return nil, err + } + return p, nil +} |