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path: root/vendor/golang.org/x/net/icmp/echo.go
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-rw-r--r--vendor/golang.org/x/net/icmp/echo.go157
1 files changed, 157 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..c611f65
--- /dev/null
+++ b/vendor/golang.org/x/net/icmp/echo.go
@@ -0,0 +1,157 @@
+// 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, _ Type, 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
+}
+
+// An ExtendedEchoRequest represents an ICMP extended echo request
+// message body.
+type ExtendedEchoRequest struct {
+ ID int // identifier
+ Seq int // sequence number
+ Local bool // must be true when identifying by name or index
+ Extensions []Extension // extensions
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *ExtendedEchoRequest) Len(proto int) int {
+ if p == nil {
+ return 0
+ }
+ l, _ := multipartMessageBodyDataLen(proto, false, nil, p.Extensions)
+ return 4 + l
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *ExtendedEchoRequest) Marshal(proto int) ([]byte, error) {
+ b, err := marshalMultipartMessageBody(proto, false, nil, p.Extensions)
+ if err != nil {
+ return nil, err
+ }
+ bb := make([]byte, 4)
+ binary.BigEndian.PutUint16(bb[:2], uint16(p.ID))
+ bb[2] = byte(p.Seq)
+ if p.Local {
+ bb[3] |= 0x01
+ }
+ bb = append(bb, b...)
+ return bb, nil
+}
+
+// parseExtendedEchoRequest parses b as an ICMP extended echo request
+// message body.
+func parseExtendedEchoRequest(proto int, typ Type, b []byte) (MessageBody, error) {
+ if len(b) < 4+4 {
+ return nil, errMessageTooShort
+ }
+ p := &ExtendedEchoRequest{ID: int(binary.BigEndian.Uint16(b[:2])), Seq: int(b[2])}
+ if b[3]&0x01 != 0 {
+ p.Local = true
+ }
+ var err error
+ _, p.Extensions, err = parseMultipartMessageBody(proto, typ, b[4:])
+ if err != nil {
+ return nil, err
+ }
+ return p, nil
+}
+
+// An ExtendedEchoReply represents an ICMP extended echo reply message
+// body.
+type ExtendedEchoReply struct {
+ ID int // identifier
+ Seq int // sequence number
+ State int // 3-bit state working together with Message.Code
+ Active bool // probed interface is active
+ IPv4 bool // probed interface runs IPv4
+ IPv6 bool // probed interface runs IPv6
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *ExtendedEchoReply) Len(proto int) int {
+ if p == nil {
+ return 0
+ }
+ return 4
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *ExtendedEchoReply) Marshal(proto int) ([]byte, error) {
+ b := make([]byte, 4)
+ binary.BigEndian.PutUint16(b[:2], uint16(p.ID))
+ b[2] = byte(p.Seq)
+ b[3] = byte(p.State<<5) & 0xe0
+ if p.Active {
+ b[3] |= 0x04
+ }
+ if p.IPv4 {
+ b[3] |= 0x02
+ }
+ if p.IPv6 {
+ b[3] |= 0x01
+ }
+ return b, nil
+}
+
+// parseExtendedEchoReply parses b as an ICMP extended echo reply
+// message body.
+func parseExtendedEchoReply(proto int, _ Type, b []byte) (MessageBody, error) {
+ if len(b) < 4 {
+ return nil, errMessageTooShort
+ }
+ p := &ExtendedEchoReply{
+ ID: int(binary.BigEndian.Uint16(b[:2])),
+ Seq: int(b[2]),
+ State: int(b[3]) >> 5,
+ }
+ if b[3]&0x04 != 0 {
+ p.Active = true
+ }
+ if b[3]&0x02 != 0 {
+ p.IPv4 = true
+ }
+ if b[3]&0x01 != 0 {
+ p.IPv6 = true
+ }
+ return p, nil
+}