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
|
// 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.
// Network interface identification for Windows
package net
import (
"os"
"syscall"
"unsafe"
)
func bytePtrToString(p *uint8) string {
a := (*[10000]uint8)(unsafe.Pointer(p))
i := 0
for a[i] != 0 {
i++
}
return string(a[:i])
}
func getAdapterList() (*syscall.IpAdapterInfo, error) {
b := make([]byte, 1000)
l := uint32(len(b))
a := (*syscall.IpAdapterInfo)(unsafe.Pointer(&b[0]))
err := syscall.GetAdaptersInfo(a, &l)
if err == syscall.ERROR_BUFFER_OVERFLOW {
b = make([]byte, l)
a = (*syscall.IpAdapterInfo)(unsafe.Pointer(&b[0]))
err = syscall.GetAdaptersInfo(a, &l)
}
if err != nil {
return nil, os.NewSyscallError("GetAdaptersInfo", err)
}
return a, nil
}
func getInterfaceList() ([]syscall.InterfaceInfo, error) {
s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
if err != nil {
return nil, os.NewSyscallError("Socket", err)
}
defer syscall.Closesocket(s)
ii := [20]syscall.InterfaceInfo{}
ret := uint32(0)
size := uint32(unsafe.Sizeof(ii))
err = syscall.WSAIoctl(s, syscall.SIO_GET_INTERFACE_LIST, nil, 0, (*byte)(unsafe.Pointer(&ii[0])), size, &ret, nil, 0)
if err != nil {
return nil, os.NewSyscallError("WSAIoctl", err)
}
c := ret / uint32(unsafe.Sizeof(ii[0]))
return ii[:c-1], nil
}
// If the ifindex is zero, interfaceTable returns mappings of all
// network interfaces. Otheriwse it returns a mapping of a specific
// interface.
func interfaceTable(ifindex int) ([]Interface, error) {
ai, err := getAdapterList()
if err != nil {
return nil, err
}
ii, err := getInterfaceList()
if err != nil {
return nil, err
}
var ift []Interface
for ; ai != nil; ai = ai.Next {
index := ai.Index
if ifindex == 0 || ifindex == int(index) {
var flags Flags
row := syscall.MibIfRow{Index: index}
e := syscall.GetIfEntry(&row)
if e != nil {
return nil, os.NewSyscallError("GetIfEntry", e)
}
for _, ii := range ii {
ip := (*syscall.RawSockaddrInet4)(unsafe.Pointer(&ii.Address)).Addr
ipv4 := IPv4(ip[0], ip[1], ip[2], ip[3])
ipl := &ai.IpAddressList
for ipl != nil {
ips := bytePtrToString(&ipl.IpAddress.String[0])
if ipv4.Equal(parseIPv4(ips)) {
break
}
ipl = ipl.Next
}
if ipl == nil {
continue
}
if ii.Flags&syscall.IFF_UP != 0 {
flags |= FlagUp
}
if ii.Flags&syscall.IFF_LOOPBACK != 0 {
flags |= FlagLoopback
}
if ii.Flags&syscall.IFF_BROADCAST != 0 {
flags |= FlagBroadcast
}
if ii.Flags&syscall.IFF_POINTTOPOINT != 0 {
flags |= FlagPointToPoint
}
if ii.Flags&syscall.IFF_MULTICAST != 0 {
flags |= FlagMulticast
}
}
name := bytePtrToString(&ai.AdapterName[0])
ifi := Interface{
Index: int(index),
MTU: int(row.Mtu),
Name: name,
HardwareAddr: HardwareAddr(row.PhysAddr[:row.PhysAddrLen]),
Flags: flags}
ift = append(ift, ifi)
}
}
return ift, nil
}
// If the ifindex is zero, interfaceAddrTable returns addresses
// for all network interfaces. Otherwise it returns addresses
// for a specific interface.
func interfaceAddrTable(ifindex int) ([]Addr, error) {
ai, err := getAdapterList()
if err != nil {
return nil, err
}
var ifat []Addr
for ; ai != nil; ai = ai.Next {
index := ai.Index
if ifindex == 0 || ifindex == int(index) {
ipl := &ai.IpAddressList
for ; ipl != nil; ipl = ipl.Next {
ifa := IPAddr{}
ifa.IP = parseIPv4(bytePtrToString(&ipl.IpAddress.String[0]))
ifat = append(ifat, ifa.toAddr())
}
}
}
return ifat, nil
}
// If the ifindex is zero, interfaceMulticastAddrTable returns
// addresses for all network interfaces. Otherwise it returns
// addresses for a specific interface.
func interfaceMulticastAddrTable(ifindex int) ([]Addr, error) {
return nil, nil
}
|
