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chore: move ping import to this repo to avoid license check failures
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| Copyright (c) 2009 The Go Authors. All rights reserved. | ||
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| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are | ||
| met: | ||
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| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above | ||
| copyright notice, this list of conditions and the following disclaimer | ||
| in the documentation and/or other materials provided with the | ||
| distribution. | ||
| * Neither the name of Google Inc. nor the names of its | ||
| contributors may be used to endorse or promote products derived from | ||
| this software without specific prior written permission. | ||
|
|
||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,3 @@ | ||
| // Package ping contains an ICMP pinger taken originally from the Go source | ||
| // tree. The files in this directory are licensed under ./LICENSE. | ||
| package ping |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,199 @@ | ||
| // Copyright 2009 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. | ||
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| // Taken from | ||
| // https://github.com/erikh/ping/blob/d731d249e12a103e22d5d4cdf41bf37062623ea4/ping.go | ||
| // which was originally taken from | ||
| // http://golang.org/src/pkg/net/ipraw_test.go | ||
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| package ping | ||
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| import ( | ||
| "bytes" | ||
| "errors" | ||
| "net" | ||
| "os" | ||
| "time" | ||
| ) | ||
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| const ( | ||
| icmpv4EchoRequest = 8 | ||
| icmpv4EchoReply = 0 | ||
| icmpv6EchoRequest = 128 | ||
| icmpv6EchoReply = 129 | ||
| ) | ||
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| type icmpMessage struct { | ||
| Type int // type | ||
| Code int // code | ||
| Checksum int // checksum | ||
| Body icmpMessageBody // body | ||
| } | ||
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| type icmpMessageBody interface { | ||
| Len() int | ||
| Marshal() ([]byte, error) | ||
| } | ||
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| // Marshal returns the binary enconding of the ICMP echo request or | ||
| // reply message m. | ||
| func (m *icmpMessage) Marshal() ([]byte, error) { | ||
| b := []byte{byte(m.Type), byte(m.Code), 0, 0} | ||
| if m.Body != nil && m.Body.Len() != 0 { | ||
| mb, err := m.Body.Marshal() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| b = append(b, mb...) | ||
| } | ||
| switch m.Type { | ||
| case icmpv6EchoRequest, icmpv6EchoReply: | ||
| return b, nil | ||
| } | ||
| csumcv := len(b) - 1 // checksum coverage | ||
| s := uint32(0) | ||
| for i := 0; i < csumcv; i += 2 { | ||
| s += uint32(b[i+1])<<8 | uint32(b[i]) | ||
| } | ||
| if csumcv&1 == 0 { | ||
| s += uint32(b[csumcv]) | ||
| } | ||
| s = s>>16 + s&0xffff | ||
| s = s + s>>16 | ||
| // Place checksum back in header; using ^= avoids the | ||
| // assumption the checksum bytes are zero. | ||
| b[2] ^= byte(^s & 0xff) | ||
| b[3] ^= byte(^s >> 8) | ||
| return b, nil | ||
| } | ||
|
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| // parseICMPMessage parses b as an ICMP message. | ||
| func parseICMPMessage(b []byte) (*icmpMessage, error) { | ||
| msglen := len(b) | ||
| if msglen < 4 { | ||
| return nil, errors.New("message too short") | ||
| } | ||
| m := &icmpMessage{Type: int(b[0]), Code: int(b[1]), Checksum: int(b[2])<<8 | int(b[3])} | ||
| if msglen > 4 { | ||
| var err error | ||
| switch m.Type { | ||
| case icmpv4EchoRequest, icmpv4EchoReply, icmpv6EchoRequest, icmpv6EchoReply: | ||
| m.Body, err = parseICMPEcho(b[4:]) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| } | ||
| return m, nil | ||
| } | ||
|
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| // imcpEcho represenets an ICMP echo request or reply message body. | ||
| type icmpEcho struct { | ||
| ID int // identifier | ||
| Seq int // sequence number | ||
| Data []byte // data | ||
| } | ||
|
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| func (p *icmpEcho) Len() int { | ||
| if p == nil { | ||
| return 0 | ||
| } | ||
| return 4 + len(p.Data) | ||
| } | ||
|
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| // Marshal returns the binary enconding of the ICMP echo request or | ||
| // reply message body p. | ||
| func (p *icmpEcho) Marshal() ([]byte, error) { | ||
| b := make([]byte, 4+len(p.Data)) | ||
| b[0], b[1] = byte(p.ID>>8), byte(p.ID&0xff) | ||
| b[2], b[3] = byte(p.Seq>>8), byte(p.Seq&0xff) | ||
| copy(b[4:], p.Data) | ||
| return b, nil | ||
| } | ||
|
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| // parseICMPEcho parses b as an ICMP echo request or reply message body. | ||
| func parseICMPEcho(b []byte) (*icmpEcho, error) { | ||
| bodylen := len(b) | ||
| p := &icmpEcho{ID: int(b[0])<<8 | int(b[1]), Seq: int(b[2])<<8 | int(b[3])} | ||
| if bodylen > 4 { | ||
| p.Data = make([]byte, bodylen-4) | ||
| copy(p.Data, b[4:]) | ||
| } | ||
| return p, nil | ||
| } | ||
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| func Ping(address *net.IPAddr, timeout time.Duration) bool { | ||
| err := Pinger(address, timeout) | ||
| return err == nil | ||
| } | ||
|
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| func Pinger(address *net.IPAddr, timeout time.Duration) error { | ||
| var ( | ||
| c *net.IPConn | ||
| err error | ||
| ) | ||
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| v6 := address.IP.To4() == nil | ||
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| if v6 { | ||
| c, err = net.DialIP("ip6:ipv6-icmp", nil, address) | ||
| } else { | ||
| c, err = net.DialIP("ip4:icmp", nil, address) | ||
| } | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| c.SetDeadline(time.Now().Add(timeout)) | ||
| defer c.Close() | ||
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| typ := icmpv4EchoRequest | ||
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| if v6 { | ||
| typ = icmpv6EchoRequest | ||
| } | ||
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| xid, xseq := os.Getpid()&0xffff, 1 | ||
| wb, err := (&icmpMessage{ | ||
| Type: typ, Code: 0, | ||
| Body: &icmpEcho{ | ||
| ID: xid, Seq: xseq, | ||
| Data: bytes.Repeat([]byte("Go Go Gadget Ping!!!"), 3), | ||
| }, | ||
| }).Marshal() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if _, err = c.Write(wb); err != nil { | ||
| return err | ||
| } | ||
| var m *icmpMessage | ||
| rb := make([]byte, 20+len(wb)) | ||
| for { | ||
| if _, err = c.Read(rb); err != nil { | ||
| return err | ||
| } | ||
| if !v6 { | ||
| rb = ipv4Payload(rb) | ||
| } | ||
| if m, err = parseICMPMessage(rb); err != nil { | ||
| return err | ||
| } | ||
|
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| switch m.Type { | ||
| case icmpv4EchoRequest, icmpv6EchoRequest: | ||
| continue | ||
| } | ||
| break | ||
| } | ||
| return nil | ||
| } | ||
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| func ipv4Payload(b []byte) []byte { | ||
| if len(b) < 20 { | ||
| return b | ||
| } | ||
| hdrlen := int(b[0]&0x0f) << 2 | ||
| return b[hdrlen:] | ||
| } |