mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
// 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.
|
|
|
|
// +build darwin freebsd linux netbsd openbsd windows
|
|
|
|
package ipv4
|
|
|
|
import (
|
|
"net"
|
|
"syscall"
|
|
)
|
|
|
|
// MulticastTTL returns the time-to-live field value for outgoing
|
|
// multicast packets.
|
|
func (c *dgramOpt) MulticastTTL() (int, error) {
|
|
if !c.ok() {
|
|
return 0, syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return ipv4MulticastTTL(fd)
|
|
}
|
|
|
|
// SetMulticastTTL sets the time-to-live field value for future
|
|
// outgoing multicast packets.
|
|
func (c *dgramOpt) SetMulticastTTL(ttl int) error {
|
|
if !c.ok() {
|
|
return syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return setIPv4MulticastTTL(fd, ttl)
|
|
}
|
|
|
|
// MulticastInterface returns the default interface for multicast
|
|
// packet transmissions.
|
|
func (c *dgramOpt) MulticastInterface() (*net.Interface, error) {
|
|
if !c.ok() {
|
|
return nil, syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return ipv4MulticastInterface(fd)
|
|
}
|
|
|
|
// SetMulticastInterface sets the default interface for future
|
|
// multicast packet transmissions.
|
|
func (c *dgramOpt) SetMulticastInterface(ifi *net.Interface) error {
|
|
if !c.ok() {
|
|
return syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return setIPv4MulticastInterface(fd, ifi)
|
|
}
|
|
|
|
// MulticastLoopback reports whether transmitted multicast packets
|
|
// should be copied and send back to the originator.
|
|
func (c *dgramOpt) MulticastLoopback() (bool, error) {
|
|
if !c.ok() {
|
|
return false, syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return ipv4MulticastLoopback(fd)
|
|
}
|
|
|
|
// SetMulticastLoopback sets whether transmitted multicast packets
|
|
// should be copied and send back to the originator.
|
|
func (c *dgramOpt) SetMulticastLoopback(on bool) error {
|
|
if !c.ok() {
|
|
return syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return setIPv4MulticastLoopback(fd, on)
|
|
}
|
|
|
|
// JoinGroup joins the group address group on the interface ifi.
|
|
// It uses the system assigned multicast interface when ifi is nil,
|
|
// although this is not recommended because the assignment depends on
|
|
// platforms and sometimes it might require routing configuration.
|
|
func (c *dgramOpt) JoinGroup(ifi *net.Interface, group net.Addr) error {
|
|
if !c.ok() {
|
|
return syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
grp := netAddrToIP4(group)
|
|
if grp == nil {
|
|
return errMissingAddress
|
|
}
|
|
return joinIPv4Group(fd, ifi, grp)
|
|
}
|
|
|
|
// LeaveGroup leaves the group address group on the interface ifi.
|
|
func (c *dgramOpt) LeaveGroup(ifi *net.Interface, group net.Addr) error {
|
|
if !c.ok() {
|
|
return syscall.EINVAL
|
|
}
|
|
fd, err := c.sysfd()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
grp := netAddrToIP4(group)
|
|
if grp == nil {
|
|
return errMissingAddress
|
|
}
|
|
return leaveIPv4Group(fd, ifi, grp)
|
|
}
|