266 lines
7.5 KiB
Go
266 lines
7.5 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 (
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"internal/syscall/windows"
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"os"
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"syscall"
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"unsafe"
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)
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// supportsVistaIP reports whether the platform implements new IP
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// stack and ABIs supported on Windows Vista and above.
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var supportsVistaIP bool
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func init() {
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supportsVistaIP = probeWindowsIPStack()
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}
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func probeWindowsIPStack() (supportsVistaIP bool) {
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v, err := syscall.GetVersion()
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if err != nil {
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return true // Windows 10 and above will deprecate this API
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}
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return byte(v) >= 6 // major version of Windows Vista is 6
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}
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// adapterAddresses returns a list of IP adapter and address
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// structures. The structure contains an IP adapter and flattened
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// multiple IP addresses including unicast, anycast and multicast
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// addresses.
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func adapterAddresses() ([]*windows.IpAdapterAddresses, error) {
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var b []byte
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l := uint32(15000) // recommended initial size
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for {
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b = make([]byte, l)
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err := windows.GetAdaptersAddresses(syscall.AF_UNSPEC, windows.GAA_FLAG_INCLUDE_PREFIX, 0, (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])), &l)
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if err == nil {
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if l == 0 {
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return nil, nil
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}
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break
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}
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if err.(syscall.Errno) != syscall.ERROR_BUFFER_OVERFLOW {
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return nil, os.NewSyscallError("getadaptersaddresses", err)
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}
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if l <= uint32(len(b)) {
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return nil, os.NewSyscallError("getadaptersaddresses", err)
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}
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}
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var aas []*windows.IpAdapterAddresses
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for aa := (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])); aa != nil; aa = aa.Next {
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aas = append(aas, aa)
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}
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return aas, nil
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}
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// If the ifindex is zero, interfaceTable returns mappings of all
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// network interfaces. Otherwise it returns a mapping of a specific
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// interface.
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func interfaceTable(ifindex int) ([]Interface, error) {
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aas, err := adapterAddresses()
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if err != nil {
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return nil, err
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}
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var ift []Interface
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for _, aa := range aas {
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index := aa.IfIndex
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if index == 0 { // ipv6IfIndex is a substitute for ifIndex
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index = aa.Ipv6IfIndex
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}
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if ifindex == 0 || ifindex == int(index) {
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ifi := Interface{
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Index: int(index),
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Name: syscall.UTF16ToString((*(*[10000]uint16)(unsafe.Pointer(aa.FriendlyName)))[:]),
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}
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if aa.OperStatus == windows.IfOperStatusUp {
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ifi.Flags |= FlagUp
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}
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// For now we need to infer link-layer service
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// capabilities from media types.
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// We will be able to use
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// MIB_IF_ROW2.AccessType once we drop support
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// for Windows XP.
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switch aa.IfType {
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case windows.IF_TYPE_ETHERNET_CSMACD, windows.IF_TYPE_ISO88025_TOKENRING, windows.IF_TYPE_IEEE80211, windows.IF_TYPE_IEEE1394:
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ifi.Flags |= FlagBroadcast | FlagMulticast
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case windows.IF_TYPE_PPP, windows.IF_TYPE_TUNNEL:
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ifi.Flags |= FlagPointToPoint | FlagMulticast
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case windows.IF_TYPE_SOFTWARE_LOOPBACK:
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ifi.Flags |= FlagLoopback | FlagMulticast
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case windows.IF_TYPE_ATM:
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ifi.Flags |= FlagBroadcast | FlagPointToPoint | FlagMulticast // assume all services available; LANE, point-to-point and point-to-multipoint
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}
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if aa.Mtu == 0xffffffff {
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ifi.MTU = -1
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} else {
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ifi.MTU = int(aa.Mtu)
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}
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if aa.PhysicalAddressLength > 0 {
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ifi.HardwareAddr = make(HardwareAddr, aa.PhysicalAddressLength)
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copy(ifi.HardwareAddr, aa.PhysicalAddress[:])
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}
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ift = append(ift, ifi)
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if ifindex == ifi.Index {
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break
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}
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}
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}
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return ift, nil
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}
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// If the ifi is nil, interfaceAddrTable returns addresses for all
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// network interfaces. Otherwise it returns addresses for a specific
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// interface.
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func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
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aas, err := adapterAddresses()
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if err != nil {
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return nil, err
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}
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var ifat []Addr
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for _, aa := range aas {
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index := aa.IfIndex
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if index == 0 { // ipv6IfIndex is a substitute for ifIndex
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index = aa.Ipv6IfIndex
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}
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var pfx4, pfx6 []IPNet
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if !supportsVistaIP {
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pfx4, pfx6, err = addrPrefixTable(aa)
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if err != nil {
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return nil, err
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}
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}
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if ifi == nil || ifi.Index == int(index) {
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for puni := aa.FirstUnicastAddress; puni != nil; puni = puni.Next {
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sa, err := puni.Address.Sockaddr.Sockaddr()
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if err != nil {
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return nil, os.NewSyscallError("sockaddr", err)
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}
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var l int
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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if supportsVistaIP {
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l = int(puni.OnLinkPrefixLength)
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} else {
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l = addrPrefixLen(pfx4, IP(sa.Addr[:]))
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}
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ifat = append(ifat, &IPNet{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3]), Mask: CIDRMask(l, 8*IPv4len)})
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case *syscall.SockaddrInet6:
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if supportsVistaIP {
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l = int(puni.OnLinkPrefixLength)
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} else {
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l = addrPrefixLen(pfx6, IP(sa.Addr[:]))
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}
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ifa := &IPNet{IP: make(IP, IPv6len), Mask: CIDRMask(l, 8*IPv6len)}
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copy(ifa.IP, sa.Addr[:])
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ifat = append(ifat, ifa)
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}
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}
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for pany := aa.FirstAnycastAddress; pany != nil; pany = pany.Next {
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sa, err := pany.Address.Sockaddr.Sockaddr()
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if err != nil {
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return nil, os.NewSyscallError("sockaddr", err)
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}
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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ifat = append(ifat, &IPAddr{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])})
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case *syscall.SockaddrInet6:
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ifa := &IPAddr{IP: make(IP, IPv6len)}
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copy(ifa.IP, sa.Addr[:])
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ifat = append(ifat, ifa)
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}
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}
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}
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}
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return ifat, nil
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}
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func addrPrefixTable(aa *windows.IpAdapterAddresses) (pfx4, pfx6 []IPNet, err error) {
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for p := aa.FirstPrefix; p != nil; p = p.Next {
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sa, err := p.Address.Sockaddr.Sockaddr()
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if err != nil {
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return nil, nil, os.NewSyscallError("sockaddr", err)
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}
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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pfx := IPNet{IP: IP(sa.Addr[:]), Mask: CIDRMask(int(p.PrefixLength), 8*IPv4len)}
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pfx4 = append(pfx4, pfx)
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case *syscall.SockaddrInet6:
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pfx := IPNet{IP: IP(sa.Addr[:]), Mask: CIDRMask(int(p.PrefixLength), 8*IPv6len)}
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pfx6 = append(pfx6, pfx)
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}
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}
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return
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}
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// addrPrefixLen returns an appropriate prefix length in bits for ip
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// from pfxs. It returns 32 or 128 when no appropriate on-link address
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// prefix found.
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//
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// NOTE: This is pretty naive implementation that contains many
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// allocations and non-effective linear search, and should not be used
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// freely.
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func addrPrefixLen(pfxs []IPNet, ip IP) int {
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var l int
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var cand *IPNet
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for i := range pfxs {
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if !pfxs[i].Contains(ip) {
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continue
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}
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if cand == nil {
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l, _ = pfxs[i].Mask.Size()
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cand = &pfxs[i]
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continue
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}
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m, _ := pfxs[i].Mask.Size()
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if m > l {
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l = m
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cand = &pfxs[i]
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continue
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}
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}
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if l > 0 {
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return l
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}
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if ip.To4() != nil {
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return 8 * IPv4len
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}
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return 8 * IPv6len
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}
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// interfaceMulticastAddrTable returns addresses for a specific
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// interface.
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func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
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aas, err := adapterAddresses()
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if err != nil {
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return nil, err
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}
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var ifat []Addr
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for _, aa := range aas {
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index := aa.IfIndex
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if index == 0 { // ipv6IfIndex is a substitute for ifIndex
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index = aa.Ipv6IfIndex
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}
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if ifi == nil || ifi.Index == int(index) {
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for pmul := aa.FirstMulticastAddress; pmul != nil; pmul = pmul.Next {
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sa, err := pmul.Address.Sockaddr.Sockaddr()
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if err != nil {
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return nil, os.NewSyscallError("sockaddr", err)
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}
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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ifat = append(ifat, &IPAddr{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])})
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case *syscall.SockaddrInet6:
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ifa := &IPAddr{IP: make(IP, IPv6len)}
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copy(ifa.IP, sa.Addr[:])
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ifat = append(ifat, ifa)
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}
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}
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}
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}
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return ifat, nil
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}
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