118 lines
2.7 KiB
Go
118 lines
2.7 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package icmp
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import (
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"net"
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"runtime"
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"syscall"
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"time"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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)
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var _ net.PacketConn = &PacketConn{}
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type ipc interface{}
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// A PacketConn represents a packet network endpoint that uses either
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// ICMPv4 or ICMPv6.
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type PacketConn struct {
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c net.PacketConn
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ipc // either ipv4.PacketConn or ipv6.PacketConn
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}
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func (c *PacketConn) ok() bool { return c != nil && c.c != nil }
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// IPv4PacketConn returns the ipv4.PacketConn of c.
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// It returns nil when c is not created as the endpoint for ICMPv4.
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func (c *PacketConn) IPv4PacketConn() *ipv4.PacketConn {
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if !c.ok() {
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return nil
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}
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p, _ := c.ipc.(*ipv4.PacketConn)
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return p
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}
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// IPv6PacketConn returns the ipv6.PacketConn of c.
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// It returns nil when c is not created as the endpoint for ICMPv6.
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func (c *PacketConn) IPv6PacketConn() *ipv6.PacketConn {
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if !c.ok() {
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return nil
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}
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p, _ := c.ipc.(*ipv6.PacketConn)
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return p
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}
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// ReadFrom reads an ICMP message from the connection.
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func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
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if !c.ok() {
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return 0, nil, syscall.EINVAL
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}
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// Please be informed that ipv4.NewPacketConn enables
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// IP_STRIPHDR option by default on Darwin.
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// See golang.org/issue/9395 for futher information.
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if runtime.GOOS == "darwin" {
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if p, _ := c.ipc.(*ipv4.PacketConn); p != nil {
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n, _, peer, err := p.ReadFrom(b)
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return n, peer, err
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}
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}
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return c.c.ReadFrom(b)
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}
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// WriteTo writes the ICMP message b to dst.
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// Dst must be net.UDPAddr when c is a non-privileged
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// datagram-oriented ICMP endpoint. Otherwise it must be net.IPAddr.
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func (c *PacketConn) WriteTo(b []byte, dst net.Addr) (int, error) {
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if !c.ok() {
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return 0, syscall.EINVAL
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}
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return c.c.WriteTo(b, dst)
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}
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// Close closes the endpoint.
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func (c *PacketConn) Close() error {
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if !c.ok() {
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return syscall.EINVAL
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}
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return c.c.Close()
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}
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// LocalAddr returns the local network address.
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func (c *PacketConn) LocalAddr() net.Addr {
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if !c.ok() {
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return nil
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}
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return c.c.LocalAddr()
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}
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// SetDeadline sets the read and write deadlines associated with the
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// endpoint.
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func (c *PacketConn) SetDeadline(t time.Time) error {
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if !c.ok() {
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return syscall.EINVAL
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}
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return c.c.SetDeadline(t)
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}
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// SetReadDeadline sets the read deadline associated with the
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// endpoint.
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func (c *PacketConn) SetReadDeadline(t time.Time) error {
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if !c.ok() {
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return syscall.EINVAL
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}
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return c.c.SetReadDeadline(t)
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}
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// SetWriteDeadline sets the write deadline associated with the
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// endpoint.
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func (c *PacketConn) SetWriteDeadline(t time.Time) error {
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if !c.ok() {
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return syscall.EINVAL
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}
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return c.c.SetWriteDeadline(t)
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}
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