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// 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 (
"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]))
// TODO(mikio): GetAdaptersInfo returns IP_ADAPTER_INFO that
// contains IPv4 address list only. We should use another API
// for fetching IPv6 stuff from the kernel.
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 := sysSocket(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. Otherwise 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 ifi is nil, interfaceAddrTable returns addresses for all
// network interfaces. Otherwise it returns addresses for a specific
// interface.
func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
ai, err := getAdapterList()
if err != nil {
return nil, err
}
var ifat []Addr
for ; ai != nil; ai = ai.Next {
index := ai.Index
if ifi == nil || ifi.Index == int(index) {
ipl := &ai.IpAddressList
for ; ipl != nil; ipl = ipl.Next {
ifa := IPAddr{IP: parseIPv4(bytePtrToString(&ipl.IpAddress.String[0]))}
ifat = append(ifat, ifa.toAddr())
}
}
}
return ifat, nil
}
// interfaceMulticastAddrTable returns addresses for a specific
// interface.
func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
// TODO(mikio): Implement this like other platforms.
return nil, nil
}
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