summaryrefslogtreecommitdiffstats
path: root/src/net/interface_windows.go
blob: 22a13128499bcf31d8f37ac0741b3a1a3454987c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
// 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 (
	"internal/syscall/windows"
	"os"
	"syscall"
	"unsafe"
)

// adapterAddresses returns a list of IP adapter and address
// structures. The structure contains an IP adapter and flattened
// multiple IP addresses including unicast, anycast and multicast
// addresses.
func adapterAddresses() ([]*windows.IpAdapterAddresses, error) {
	var b []byte
	l := uint32(15000) // recommended initial size
	for {
		b = make([]byte, l)
		err := windows.GetAdaptersAddresses(syscall.AF_UNSPEC, windows.GAA_FLAG_INCLUDE_PREFIX, 0, (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])), &l)
		if err == nil {
			if l == 0 {
				return nil, nil
			}
			break
		}
		if err.(syscall.Errno) != syscall.ERROR_BUFFER_OVERFLOW {
			return nil, os.NewSyscallError("getadaptersaddresses", err)
		}
		if l <= uint32(len(b)) {
			return nil, os.NewSyscallError("getadaptersaddresses", err)
		}
	}
	var aas []*windows.IpAdapterAddresses
	for aa := (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])); aa != nil; aa = aa.Next {
		aas = append(aas, aa)
	}
	return aas, nil
}

// If the ifindex is zero, interfaceTable returns mappings of all
// network interfaces. Otherwise it returns a mapping of a specific
// interface.
func interfaceTable(ifindex int) ([]Interface, error) {
	aas, err := adapterAddresses()
	if err != nil {
		return nil, err
	}
	var ift []Interface
	for _, aa := range aas {
		index := aa.IfIndex
		if index == 0 { // ipv6IfIndex is a substitute for ifIndex
			index = aa.Ipv6IfIndex
		}
		if ifindex == 0 || ifindex == int(index) {
			ifi := Interface{
				Index: int(index),
				Name:  windows.UTF16PtrToString(aa.FriendlyName),
			}
			if aa.OperStatus == windows.IfOperStatusUp {
				ifi.Flags |= FlagUp
				ifi.Flags |= FlagRunning
			}
			// For now we need to infer link-layer service
			// capabilities from media types.
			// TODO: use MIB_IF_ROW2.AccessType now that we no longer support
			// Windows XP.
			switch aa.IfType {
			case windows.IF_TYPE_ETHERNET_CSMACD, windows.IF_TYPE_ISO88025_TOKENRING, windows.IF_TYPE_IEEE80211, windows.IF_TYPE_IEEE1394:
				ifi.Flags |= FlagBroadcast | FlagMulticast
			case windows.IF_TYPE_PPP, windows.IF_TYPE_TUNNEL:
				ifi.Flags |= FlagPointToPoint | FlagMulticast
			case windows.IF_TYPE_SOFTWARE_LOOPBACK:
				ifi.Flags |= FlagLoopback | FlagMulticast
			case windows.IF_TYPE_ATM:
				ifi.Flags |= FlagBroadcast | FlagPointToPoint | FlagMulticast // assume all services available; LANE, point-to-point and point-to-multipoint
			}
			if aa.Mtu == 0xffffffff {
				ifi.MTU = -1
			} else {
				ifi.MTU = int(aa.Mtu)
			}
			if aa.PhysicalAddressLength > 0 {
				ifi.HardwareAddr = make(HardwareAddr, aa.PhysicalAddressLength)
				copy(ifi.HardwareAddr, aa.PhysicalAddress[:])
			}
			ift = append(ift, ifi)
			if ifindex == ifi.Index {
				break
			}
		}
	}
	return ift, nil
}

// If the ifi is nil, interfaceAddrTable returns addresses for all
// network interfaces. Otherwise it returns addresses for a specific
// interface.
func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
	aas, err := adapterAddresses()
	if err != nil {
		return nil, err
	}
	var ifat []Addr
	for _, aa := range aas {
		index := aa.IfIndex
		if index == 0 { // ipv6IfIndex is a substitute for ifIndex
			index = aa.Ipv6IfIndex
		}
		if ifi == nil || ifi.Index == int(index) {
			for puni := aa.FirstUnicastAddress; puni != nil; puni = puni.Next {
				sa, err := puni.Address.Sockaddr.Sockaddr()
				if err != nil {
					return nil, os.NewSyscallError("sockaddr", err)
				}
				switch sa := sa.(type) {
				case *syscall.SockaddrInet4:
					ifat = append(ifat, &IPNet{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3]), Mask: CIDRMask(int(puni.OnLinkPrefixLength), 8*IPv4len)})
				case *syscall.SockaddrInet6:
					ifa := &IPNet{IP: make(IP, IPv6len), Mask: CIDRMask(int(puni.OnLinkPrefixLength), 8*IPv6len)}
					copy(ifa.IP, sa.Addr[:])
					ifat = append(ifat, ifa)
				}
			}
			for pany := aa.FirstAnycastAddress; pany != nil; pany = pany.Next {
				sa, err := pany.Address.Sockaddr.Sockaddr()
				if err != nil {
					return nil, os.NewSyscallError("sockaddr", err)
				}
				switch sa := sa.(type) {
				case *syscall.SockaddrInet4:
					ifat = append(ifat, &IPAddr{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])})
				case *syscall.SockaddrInet6:
					ifa := &IPAddr{IP: make(IP, IPv6len)}
					copy(ifa.IP, sa.Addr[:])
					ifat = append(ifat, ifa)
				}
			}
		}
	}
	return ifat, nil
}

// interfaceMulticastAddrTable returns addresses for a specific
// interface.
func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
	aas, err := adapterAddresses()
	if err != nil {
		return nil, err
	}
	var ifat []Addr
	for _, aa := range aas {
		index := aa.IfIndex
		if index == 0 { // ipv6IfIndex is a substitute for ifIndex
			index = aa.Ipv6IfIndex
		}
		if ifi == nil || ifi.Index == int(index) {
			for pmul := aa.FirstMulticastAddress; pmul != nil; pmul = pmul.Next {
				sa, err := pmul.Address.Sockaddr.Sockaddr()
				if err != nil {
					return nil, os.NewSyscallError("sockaddr", err)
				}
				switch sa := sa.(type) {
				case *syscall.SockaddrInet4:
					ifat = append(ifat, &IPAddr{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])})
				case *syscall.SockaddrInet6:
					ifa := &IPAddr{IP: make(IP, IPv6len)}
					copy(ifa.IP, sa.Addr[:])
					ifat = append(ifat, ifa)
				}
			}
		}
	}
	return ifat, nil
}