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Foundation: tweak address resolution on Windows #2235

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May 9, 2019
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Foundation: tweak address resolution on Windows #2235

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52 changes: 31 additions & 21 deletions Foundation/Host.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -94,40 +94,50 @@ open class Host: NSObject {

internal func _resolveCurrent() {
#if os(Windows)
var szAddress: [WCHAR] =
Array<WCHAR>(repeating: 0, count: Int(NI_MAXHOST))

var ulSize: ULONG = 0
var ulResult: ULONG =
GetAdaptersAddresses(ULONG(AF_UNSPEC), 0, nil, nil, &ulSize)

let arAdapterInfo: UnsafeMutablePointer<IP_ADAPTER_ADDRESSES> =
UnsafeMutablePointer<IP_ADAPTER_ADDRESSES_LH>
.allocate(capacity: Int(ulSize) / MemoryLayout<IP_ADAPTER_ADDRESSES>.size)
defer { arAdapterInfo.deallocate() }
var arAdapters: UnsafeMutableRawPointer =
UnsafeMutableRawPointer.allocate(byteCount: Int(ulSize),
alignment: 1)
defer { arAdapters.deallocate() }

ulResult = GetAdaptersAddresses(ULONG(AF_UNSPEC), 0, nil,
arAdapters.assumingMemoryBound(to: IP_ADAPTER_ADDRESSES.self),
&ulSize)
guard ulResult == ERROR_SUCCESS else { return }

ulResult = GetAdaptersAddresses(ULONG(AF_UNSPEC), 0, nil, arAdapterInfo, &ulSize)
var pAdapter: UnsafeMutablePointer<IP_ADAPTER_ADDRESSES>? =
arAdapters.assumingMemoryBound(to: IP_ADAPTER_ADDRESSES.self)
while pAdapter != nil {
// print("Adapter: \(String(cString: pAdapter!.pointee.AdapterName))")

var buffer: [WCHAR] = Array<WCHAR>(repeating: 0, count: Int(NI_MAXHOST))
var arAddresses: UnsafeMutablePointer<IP_ADAPTER_UNICAST_ADDRESS> =
pAdapter!.pointee.FirstUnicastAddress

var arCurrentAdapterInfo: UnsafeMutablePointer<IP_ADAPTER_ADDRESSES>? =
arAdapterInfo
while arCurrentAdapterInfo != nil {
var arAddress: UnsafeMutablePointer<IP_ADAPTER_UNICAST_ADDRESS>? =
arCurrentAdapterInfo!.pointee.FirstUnicastAddress
while arAddress != nil {
let arCurrentAddress: IP_ADAPTER_UNICAST_ADDRESS = arAddress!.pointee
switch arCurrentAddress.Address.lpSockaddr.pointee.sa_family {
var pAddress: UnsafeMutablePointer<IP_ADAPTER_UNICAST_ADDRESS>? =
arAddresses
while pAddress != nil {
switch pAddress!.pointee.Address.lpSockaddr.pointee.sa_family {
case ADDRESS_FAMILY(AF_INET), ADDRESS_FAMILY(AF_INET6):
if GetNameInfoW(arCurrentAddress.Address.lpSockaddr,
arCurrentAddress.Address.iSockaddrLength,
&buffer, DWORD(NI_MAXHOST),
nil, 0, NI_NUMERICHOST) == 0 {
_addresses.append(String(decodingCString: &buffer,
if GetNameInfoW(pAddress!.pointee.Address.lpSockaddr,
pAddress!.pointee.Address.iSockaddrLength,
&szAddress, DWORD(szAddress.capacity), nil, 0,
NI_NUMERICHOST) == 0 {
// print("\tIP Address: \(String(decodingCString: &szAddress, as: UTF16.self))")
_addresses.append(String(decodingCString: &szAddress,
as: UTF16.self))
}
default: break
}
arAddress = arCurrentAddress.Next
pAddress = pAddress!.pointee.Next
}
arCurrentAdapterInfo = arCurrentAdapterInfo!.pointee.Next

pAdapter = pAdapter!.pointee.Next
}
_resolved = true
#else
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