ab9dd18bec
See https://github.com/hashicorp/consul/issues/3977 While trying to improve furthermore #3948 (This pull request is still valid since we are not using Compression to compute the result anyway). I saw a strange behaviour of dns library. Basically, msg.Len() and len(msg.Pack()) disagree on Message len. Thus, calculation of DNS response is false consul relies on msg.Len() instead of the result of Pack() This is linked to miekg/dns#453 and a fix has been provided with miekg/dns#454 Would it be possible to upgrade miekg/dns to a more recent function ? Consul might for instance upgrade to a post 1.0 release such as https://github.com/miekg/dns/releases/tag/v1.0.4
129 lines
3.1 KiB
Go
129 lines
3.1 KiB
Go
// Copyright 2013 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 ipv6
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import (
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"net"
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"syscall"
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"time"
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"golang.org/x/net/internal/socket"
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)
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// BUG(mikio): On Windows, the JoinSourceSpecificGroup,
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// LeaveSourceSpecificGroup, ExcludeSourceSpecificGroup and
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// IncludeSourceSpecificGroup methods of PacketConn are not
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// implemented.
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// A Conn represents a network endpoint that uses IPv6 transport.
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// It allows to set basic IP-level socket options such as traffic
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// class and hop limit.
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type Conn struct {
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genericOpt
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}
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type genericOpt struct {
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*socket.Conn
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}
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func (c *genericOpt) ok() bool { return c != nil && c.Conn != nil }
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// PathMTU returns a path MTU value for the destination associated
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// with the endpoint.
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func (c *Conn) PathMTU() (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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so, ok := sockOpts[ssoPathMTU]
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if !ok {
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return 0, errOpNoSupport
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}
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_, mtu, err := so.getMTUInfo(c.Conn)
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if err != nil {
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return 0, err
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}
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return mtu, nil
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}
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// NewConn returns a new Conn.
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func NewConn(c net.Conn) *Conn {
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cc, _ := socket.NewConn(c)
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return &Conn{
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genericOpt: genericOpt{Conn: cc},
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}
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}
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// A PacketConn represents a packet network endpoint that uses IPv6
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// transport. It is used to control several IP-level socket options
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// including IPv6 header manipulation. It also provides datagram
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// based network I/O methods specific to the IPv6 and higher layer
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// protocols such as OSPF, GRE, and UDP.
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type PacketConn struct {
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genericOpt
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dgramOpt
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payloadHandler
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}
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type dgramOpt struct {
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*socket.Conn
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}
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func (c *dgramOpt) ok() bool { return c != nil && c.Conn != nil }
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// SetControlMessage allows to receive the per packet basis IP-level
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// socket options.
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func (c *PacketConn) SetControlMessage(cf ControlFlags, on bool) error {
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if !c.payloadHandler.ok() {
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return syscall.EINVAL
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}
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return setControlMessage(c.dgramOpt.Conn, &c.payloadHandler.rawOpt, cf, on)
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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.payloadHandler.ok() {
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return syscall.EINVAL
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}
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return c.payloadHandler.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.payloadHandler.ok() {
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return syscall.EINVAL
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}
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return c.payloadHandler.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.payloadHandler.ok() {
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return syscall.EINVAL
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}
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return c.payloadHandler.SetWriteDeadline(t)
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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.payloadHandler.ok() {
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return syscall.EINVAL
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}
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return c.payloadHandler.Close()
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}
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// NewPacketConn returns a new PacketConn using c as its underlying
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// transport.
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func NewPacketConn(c net.PacketConn) *PacketConn {
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cc, _ := socket.NewConn(c.(net.Conn))
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return &PacketConn{
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genericOpt: genericOpt{Conn: cc},
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dgramOpt: dgramOpt{Conn: cc},
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payloadHandler: payloadHandler{PacketConn: c, Conn: cc},
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}
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}
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