127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
// Copyright 2011 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 net
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import "errors"
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var (
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errInvalidInterface = errors.New("net: invalid interface")
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errInvalidInterfaceIndex = errors.New("net: invalid interface index")
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errInvalidInterfaceName = errors.New("net: invalid interface name")
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errNoSuchInterface = errors.New("net: no such interface")
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errNoSuchMulticastInterface = errors.New("net: no such multicast interface")
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)
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// Interface represents a mapping between network interface name
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// and index. It also represents network interface facility
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// information.
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type Interface struct {
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Index int // positive integer that starts at one, zero is never used
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MTU int // maximum transmission unit
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Name string // e.g., "en0", "lo0", "eth0.100"
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HardwareAddr HardwareAddr // IEEE MAC-48, EUI-48 and EUI-64 form
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Flags Flags // e.g., FlagUp, FlagLoopback, FlagMulticast
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}
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type Flags uint
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const (
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FlagUp Flags = 1 << iota // interface is up
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FlagBroadcast // interface supports broadcast access capability
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FlagLoopback // interface is a loopback interface
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FlagPointToPoint // interface belongs to a point-to-point link
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FlagMulticast // interface supports multicast access capability
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)
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var flagNames = []string{
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"up",
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"broadcast",
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"loopback",
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"pointtopoint",
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"multicast",
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}
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func (f Flags) String() string {
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s := ""
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for i, name := range flagNames {
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if f&(1<<uint(i)) != 0 {
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if s != "" {
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s += "|"
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}
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s += name
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}
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}
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if s == "" {
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s = "0"
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}
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return s
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}
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// Addrs returns interface addresses for a specific interface.
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func (ifi *Interface) Addrs() ([]Addr, error) {
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if ifi == nil {
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return nil, errInvalidInterface
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}
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return interfaceAddrTable(ifi)
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}
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// MulticastAddrs returns multicast, joined group addresses for
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// a specific interface.
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func (ifi *Interface) MulticastAddrs() ([]Addr, error) {
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if ifi == nil {
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return nil, errInvalidInterface
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}
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return interfaceMulticastAddrTable(ifi)
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}
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// Interfaces returns a list of the system's network interfaces.
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func Interfaces() ([]Interface, error) {
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return interfaceTable(0)
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}
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// InterfaceAddrs returns a list of the system's network interface
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// addresses.
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func InterfaceAddrs() ([]Addr, error) {
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return interfaceAddrTable(nil)
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}
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// InterfaceByIndex returns the interface specified by index.
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func InterfaceByIndex(index int) (*Interface, error) {
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if index <= 0 {
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return nil, errInvalidInterfaceIndex
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}
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ift, err := interfaceTable(index)
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if err != nil {
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return nil, err
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}
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return interfaceByIndex(ift, index)
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}
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func interfaceByIndex(ift []Interface, index int) (*Interface, error) {
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for _, ifi := range ift {
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if index == ifi.Index {
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return &ifi, nil
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}
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}
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return nil, errNoSuchInterface
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}
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// InterfaceByName returns the interface specified by name.
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func InterfaceByName(name string) (*Interface, error) {
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if name == "" {
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return nil, errInvalidInterfaceName
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}
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ift, err := interfaceTable(0)
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if err != nil {
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return nil, err
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}
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for _, ifi := range ift {
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if name == ifi.Name {
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return &ifi, nil
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}
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}
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return nil, errNoSuchInterface
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}
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