mirror of
https://github.com/DNSCrypt/dnscrypt-proxy.git
synced 2024-12-29 00:30:30 +01:00
128 lines
3.1 KiB
Go
128 lines
3.1 KiB
Go
// Copyright 2013 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 ipv6
|
|
|
|
import (
|
|
"net"
|
|
"time"
|
|
|
|
"golang.org/x/net/internal/socket"
|
|
)
|
|
|
|
// BUG(mikio): On Windows, the JoinSourceSpecificGroup,
|
|
// LeaveSourceSpecificGroup, ExcludeSourceSpecificGroup and
|
|
// IncludeSourceSpecificGroup methods of PacketConn are not
|
|
// implemented.
|
|
|
|
// A Conn represents a network endpoint that uses IPv6 transport.
|
|
// It allows to set basic IP-level socket options such as traffic
|
|
// class and hop limit.
|
|
type Conn struct {
|
|
genericOpt
|
|
}
|
|
|
|
type genericOpt struct {
|
|
*socket.Conn
|
|
}
|
|
|
|
func (c *genericOpt) ok() bool { return c != nil && c.Conn != nil }
|
|
|
|
// PathMTU returns a path MTU value for the destination associated
|
|
// with the endpoint.
|
|
func (c *Conn) PathMTU() (int, error) {
|
|
if !c.ok() {
|
|
return 0, errInvalidConn
|
|
}
|
|
so, ok := sockOpts[ssoPathMTU]
|
|
if !ok {
|
|
return 0, errOpNoSupport
|
|
}
|
|
_, mtu, err := so.getMTUInfo(c.Conn)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return mtu, nil
|
|
}
|
|
|
|
// NewConn returns a new Conn.
|
|
func NewConn(c net.Conn) *Conn {
|
|
cc, _ := socket.NewConn(c)
|
|
return &Conn{
|
|
genericOpt: genericOpt{Conn: cc},
|
|
}
|
|
}
|
|
|
|
// A PacketConn represents a packet network endpoint that uses IPv6
|
|
// transport. It is used to control several IP-level socket options
|
|
// including IPv6 header manipulation. It also provides datagram
|
|
// based network I/O methods specific to the IPv6 and higher layer
|
|
// protocols such as OSPF, GRE, and UDP.
|
|
type PacketConn struct {
|
|
genericOpt
|
|
dgramOpt
|
|
payloadHandler
|
|
}
|
|
|
|
type dgramOpt struct {
|
|
*socket.Conn
|
|
}
|
|
|
|
func (c *dgramOpt) ok() bool { return c != nil && c.Conn != nil }
|
|
|
|
// SetControlMessage allows to receive the per packet basis IP-level
|
|
// socket options.
|
|
func (c *PacketConn) SetControlMessage(cf ControlFlags, on bool) error {
|
|
if !c.payloadHandler.ok() {
|
|
return errInvalidConn
|
|
}
|
|
return setControlMessage(c.dgramOpt.Conn, &c.payloadHandler.rawOpt, cf, on)
|
|
}
|
|
|
|
// SetDeadline sets the read and write deadlines associated with the
|
|
// endpoint.
|
|
func (c *PacketConn) SetDeadline(t time.Time) error {
|
|
if !c.payloadHandler.ok() {
|
|
return errInvalidConn
|
|
}
|
|
return c.payloadHandler.SetDeadline(t)
|
|
}
|
|
|
|
// SetReadDeadline sets the read deadline associated with the
|
|
// endpoint.
|
|
func (c *PacketConn) SetReadDeadline(t time.Time) error {
|
|
if !c.payloadHandler.ok() {
|
|
return errInvalidConn
|
|
}
|
|
return c.payloadHandler.SetReadDeadline(t)
|
|
}
|
|
|
|
// SetWriteDeadline sets the write deadline associated with the
|
|
// endpoint.
|
|
func (c *PacketConn) SetWriteDeadline(t time.Time) error {
|
|
if !c.payloadHandler.ok() {
|
|
return errInvalidConn
|
|
}
|
|
return c.payloadHandler.SetWriteDeadline(t)
|
|
}
|
|
|
|
// Close closes the endpoint.
|
|
func (c *PacketConn) Close() error {
|
|
if !c.payloadHandler.ok() {
|
|
return errInvalidConn
|
|
}
|
|
return c.payloadHandler.Close()
|
|
}
|
|
|
|
// NewPacketConn returns a new PacketConn using c as its underlying
|
|
// transport.
|
|
func NewPacketConn(c net.PacketConn) *PacketConn {
|
|
cc, _ := socket.NewConn(c.(net.Conn))
|
|
return &PacketConn{
|
|
genericOpt: genericOpt{Conn: cc},
|
|
dgramOpt: dgramOpt{Conn: cc},
|
|
payloadHandler: payloadHandler{PacketConn: c, Conn: cc},
|
|
}
|
|
}
|