diff options
Diffstat (limited to 'vendor/golang.org/x/net/icmp/echo.go')
-rw-r--r-- | vendor/golang.org/x/net/icmp/echo.go | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/vendor/golang.org/x/net/icmp/echo.go b/vendor/golang.org/x/net/icmp/echo.go new file mode 100644 index 0000000..e6f15ef --- /dev/null +++ b/vendor/golang.org/x/net/icmp/echo.go @@ -0,0 +1,45 @@ +// Copyright 2012 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" + +// An Echo represents an ICMP echo request or reply message body. +type Echo struct { + ID int // identifier + Seq int // sequence number + Data []byte // data +} + +// Len implements the Len method of MessageBody interface. +func (p *Echo) Len(proto int) int { + if p == nil { + return 0 + } + return 4 + len(p.Data) +} + +// Marshal implements the Marshal method of MessageBody interface. +func (p *Echo) Marshal(proto int) ([]byte, error) { + b := make([]byte, 4+len(p.Data)) + binary.BigEndian.PutUint16(b[:2], uint16(p.ID)) + binary.BigEndian.PutUint16(b[2:4], uint16(p.Seq)) + copy(b[4:], p.Data) + return b, nil +} + +// parseEcho parses b as an ICMP echo request or reply message body. +func parseEcho(proto int, b []byte) (MessageBody, error) { + bodyLen := len(b) + if bodyLen < 4 { + return nil, errMessageTooShort + } + p := &Echo{ID: int(binary.BigEndian.Uint16(b[:2])), Seq: int(binary.BigEndian.Uint16(b[2:4]))} + if bodyLen > 4 { + p.Data = make([]byte, bodyLen-4) + copy(p.Data, b[4:]) + } + return p, nil +} |