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Code Editor : interface.go
// Copyright 2011 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 net import ( "errors" "sync" "time" ) // BUG(mikio): On JS, methods and functions related to // Interface are not implemented. // BUG(mikio): On AIX, DragonFly BSD, NetBSD, OpenBSD, Plan 9 and // Solaris, the MulticastAddrs method of Interface is not implemented. var ( errInvalidInterface = errors.New("invalid network interface") errInvalidInterfaceIndex = errors.New("invalid network interface index") errInvalidInterfaceName = errors.New("invalid network interface name") errNoSuchInterface = errors.New("no such network interface") errNoSuchMulticastInterface = errors.New("no such multicast network interface") ) // Interface represents a mapping between network interface name // and index. It also represents network interface facility // information. type Interface struct { Index int // positive integer that starts at one, zero is never used MTU int // maximum transmission unit Name string // e.g., "en0", "lo0", "eth0.100" HardwareAddr HardwareAddr // IEEE MAC-48, EUI-48 and EUI-64 form Flags Flags // e.g., FlagUp, FlagLoopback, FlagMulticast } type Flags uint const ( FlagUp Flags = 1 << iota // interface is up FlagBroadcast // interface supports broadcast access capability FlagLoopback // interface is a loopback interface FlagPointToPoint // interface belongs to a point-to-point link FlagMulticast // interface supports multicast access capability ) var flagNames = []string{ "up", "broadcast", "loopback", "pointtopoint", "multicast", } func (f Flags) String() string { s := "" for i, name := range flagNames { if f&(1<<uint(i)) != 0 { if s != "" { s += "|" } s += name } } if s == "" { s = "0" } return s } // Addrs returns a list of unicast interface addresses for a specific // interface. func (ifi *Interface) Addrs() ([]Addr, error) { if ifi == nil { return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterface} } ifat, err := interfaceAddrTable(ifi) if err != nil { err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err} } return ifat, err } // MulticastAddrs returns a list of multicast, joined group addresses // for a specific interface. func (ifi *Interface) MulticastAddrs() ([]Addr, error) { if ifi == nil { return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterface} } ifat, err := interfaceMulticastAddrTable(ifi) if err != nil { err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err} } return ifat, err } // Interfaces returns a list of the system's network interfaces. func Interfaces() ([]Interface, error) { ift, err := interfaceTable(0) if err != nil { return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err} } if len(ift) != 0 { zoneCache.update(ift, false) } return ift, nil } // InterfaceAddrs returns a list of the system's unicast interface // addresses. // // The returned list does not identify the associated interface; use // Interfaces and Interface.Addrs for more detail. func InterfaceAddrs() ([]Addr, error) { ifat, err := interfaceAddrTable(nil) if err != nil { err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err} } return ifat, err } // InterfaceByIndex returns the interface specified by index. // // On Solaris, it returns one of the logical network interfaces // sharing the logical data link; for more precision use // InterfaceByName. func InterfaceByIndex(index int) (*Interface, error) { if index <= 0 { return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterfaceIndex} } ift, err := interfaceTable(index) if err != nil { return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err} } ifi, err := interfaceByIndex(ift, index) if err != nil { err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err} } return ifi, err } func interfaceByIndex(ift []Interface, index int) (*Interface, error) { for _, ifi := range ift { if index == ifi.Index { return &ifi, nil } } return nil, errNoSuchInterface } // InterfaceByName returns the interface specified by name. func InterfaceByName(name string) (*Interface, error) { if name == "" { return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterfaceName} } ift, err := interfaceTable(0) if err != nil { return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err} } if len(ift) != 0 { zoneCache.update(ift, false) } for _, ifi := range ift { if name == ifi.Name { return &ifi, nil } } return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errNoSuchInterface} } // An ipv6ZoneCache represents a cache holding partial network // interface information. It is used for reducing the cost of IPv6 // addressing scope zone resolution. // // Multiple names sharing the index are managed by first-come // first-served basis for consistency. type ipv6ZoneCache struct { sync.RWMutex // guard the following lastFetched time.Time // last time routing information was fetched toIndex map[string]int // interface name to its index toName map[int]string // interface index to its name } var zoneCache = ipv6ZoneCache{ toIndex: make(map[string]int), toName: make(map[int]string), } // update refreshes the network interface information if the cache was last // updated more than 1 minute ago, or if force is set. It reports whether the // cache was updated. func (zc *ipv6ZoneCache) update(ift []Interface, force bool) (updated bool) { zc.Lock() defer zc.Unlock() now := time.Now() if !force && zc.lastFetched.After(now.Add(-60*time.Second)) { return false } zc.lastFetched = now if len(ift) == 0 { var err error if ift, err = interfaceTable(0); err != nil { return false } } zc.toIndex = make(map[string]int, len(ift)) zc.toName = make(map[int]string, len(ift)) for _, ifi := range ift { zc.toIndex[ifi.Name] = ifi.Index if _, ok := zc.toName[ifi.Index]; !ok { zc.toName[ifi.Index] = ifi.Name } } return true } func (zc *ipv6ZoneCache) name(index int) string { if index == 0 { return "" } updated := zoneCache.update(nil, false) zoneCache.RLock() name, ok := zoneCache.toName[index] zoneCache.RUnlock() if !ok && !updated { zoneCache.update(nil, true) zoneCache.RLock() name, ok = zoneCache.toName[index] zoneCache.RUnlock() } if !ok { // last resort name = uitoa(uint(index)) } return name } func (zc *ipv6ZoneCache) index(name string) int { if name == "" { return 0 } updated := zoneCache.update(nil, false) zoneCache.RLock() index, ok := zoneCache.toIndex[name] zoneCache.RUnlock() if !ok && !updated { zoneCache.update(nil, true) zoneCache.RLock() index, ok = zoneCache.toIndex[name] zoneCache.RUnlock() } if !ok { // last resort index, _, _ = dtoi(name) } return index }
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