windows: Add WSALookupService syscall wrappers

Create WSAQUERYSET struct, add LUP_XX constants,
implement wrappers around WSALookupService functions.

Fixes golang/go#54232

Change-Id: I26624df1b2b44cd8750350fe4526b806513913fe
Reviewed-on: https://go-review.googlesource.com/c/sys/+/461296
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>

Author: PumpkinSeed

windows/syscall_windows.go

@@ -824,6 +824,9 @@ const socket_error = uintptr(^uint32(0))
 //sys	WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup
 //sys	WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup
 //sys	WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) [failretval==socket_error] = ws2_32.WSAIoctl
+//sys	WSALookupServiceBegin(querySet *WSAQUERYSET, flags uint32, handle *Handle) (err error) [failretval==socket_error] = ws2_32.WSALookupServiceBeginW
+//sys	WSALookupServiceNext(handle Handle, flags uint32, size *int32, querySet *WSAQUERYSET) (err error) [failretval==socket_error] = ws2_32.WSALookupServiceNextW
+//sys	WSALookupServiceEnd(handle Handle) (err error) [failretval==socket_error] = ws2_32.WSALookupServiceEnd
 //sys	socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket
 //sys	sendto(s Handle, buf []byte, flags int32, to unsafe.Pointer, tolen int32) (err error) [failretval==socket_error] = ws2_32.sendto
 //sys	recvfrom(s Handle, buf []byte, flags int32, from *RawSockaddrAny, fromlen *int32) (n int32, err error) [failretval==-1] = ws2_32.recvfrom

windows/syscall_windows_test.go

@@ -1078,3 +1078,52 @@ func TestProcThreadAttributeHandleList(t *testing.T) {
 		t.Fatalf("got %q; want %q", out, sentinel)
 	}
 }
+
+func TestWSALookupService(t *testing.T) {
+	var flags uint32 = windows.LUP_CONTAINERS
+	flags |= windows.LUP_RETURN_NAME
+	flags |= windows.LUP_RETURN_ADDR
+
+	var querySet windows.WSAQUERYSET
+	querySet.NameSpace = windows.NS_BTH
+	querySet.Size = uint32(unsafe.Sizeof(windows.WSAQUERYSET{}))
+
+	var handle windows.Handle
+	err := windows.WSALookupServiceBegin(&querySet, flags, &handle)
+	if err != nil {
+		if errors.Is(err, windows.WSASERVICE_NOT_FOUND) {
+			t.Skip("WSA Service not found, so skip this test")
+		}
+		t.Fatal(err)
+	}
+
+	defer windows.WSALookupServiceEnd(handle)
+
+	n := int32(unsafe.Sizeof(windows.WSAQUERYSET{}))
+	buf := make([]byte, n)
+items_loop:
+	for {
+		q := (*windows.WSAQUERYSET)(unsafe.Pointer(&buf[0]))
+		err := windows.WSALookupServiceNext(handle, flags, &n, q)
+		switch err {
+		case windows.WSA_E_NO_MORE, windows.WSAENOMORE:
+			// no more data available - break the loop
+			break items_loop
+		case windows.WSAEFAULT:
+			// buffer is too small - reallocate and try again
+			buf = make([]byte, n)
+		case nil:
+			// found a record - display the item and fetch next item
+			var addr string
+			for _, e := range q.SaBuffer.RemoteAddr.Sockaddr.Addr.Data {
+				if e != 0 {
+					addr += fmt.Sprintf("%x", e)
+				}
+			}
+			t.Logf("%s -> %s\n", windows.UTF16PtrToString(q.ServiceInstanceName), addr)
+
+		default:
+			t.Fatal(err)
+		}
+	}
+}

windows/types_windows.go

@@ -1243,6 +1243,51 @@ const (
 	DnsSectionAdditional = 0x0003
 )
 
+const (
+	// flags of WSALookupService
+	LUP_DEEP                = 0x0001
+	LUP_CONTAINERS          = 0x0002
+	LUP_NOCONTAINERS        = 0x0004
+	LUP_NEAREST             = 0x0008
+	LUP_RETURN_NAME         = 0x0010
+	LUP_RETURN_TYPE         = 0x0020
+	LUP_RETURN_VERSION      = 0x0040
+	LUP_RETURN_COMMENT      = 0x0080
+	LUP_RETURN_ADDR         = 0x0100
+	LUP_RETURN_BLOB         = 0x0200
+	LUP_RETURN_ALIASES      = 0x0400
+	LUP_RETURN_QUERY_STRING = 0x0800
+	LUP_RETURN_ALL          = 0x0FF0
+	LUP_RES_SERVICE         = 0x8000
+
+	LUP_FLUSHCACHE    = 0x1000
+	LUP_FLUSHPREVIOUS = 0x2000
+
+	LUP_NON_AUTHORITATIVE      = 0x4000
+	LUP_SECURE                 = 0x8000
+	LUP_RETURN_PREFERRED_NAMES = 0x10000
+	LUP_DNS_ONLY               = 0x20000
+
+	LUP_ADDRCONFIG           = 0x100000
+	LUP_DUAL_ADDR            = 0x200000
+	LUP_FILESERVER           = 0x400000
+	LUP_DISABLE_IDN_ENCODING = 0x00800000
+	LUP_API_ANSI             = 0x01000000
+
+	LUP_RESOLUTION_HANDLE = 0x80000000
+)
+
+const (
+	// values of WSAQUERYSET's namespace
+	NS_ALL       = 0
+	NS_DNS       = 12
+	NS_NLA       = 15
+	NS_BTH       = 16
+	NS_EMAIL     = 37
+	NS_PNRPNAME  = 38
+	NS_PNRPCLOUD = 39
+)
+
 type DNSSRVData struct {
 	Target   *uint16
 	Priority uint16
@@ -3258,3 +3303,43 @@ const (
 	DWMWA_TEXT_COLOR                     = 36
 	DWMWA_VISIBLE_FRAME_BORDER_THICKNESS = 37
 )
+
+type WSAQUERYSET struct {
+	Size                uint32
+	ServiceInstanceName *uint16
+	ServiceClassId      *GUID
+	Version             *WSAVersion
+	Comment             *uint16
+	NameSpace           uint32
+	NSProviderId        *GUID
+	Context             *uint16
+	NumberOfProtocols   uint32
+	AfpProtocols        *AFProtocols
+	QueryString         *uint16
+	NumberOfCsAddrs     uint32
+	SaBuffer            *CSAddrInfo
+	OutputFlags         uint32
+	Blob                *BLOB
+}
+
+type WSAVersion struct {
+	Version                 uint32
+	EnumerationOfComparison int32
+}
+
+type AFProtocols struct {
+	AddressFamily int32
+	Protocol      int32
+}
+
+type CSAddrInfo struct {
+	LocalAddr  SocketAddress
+	RemoteAddr SocketAddress
+	SocketType int32
+	Protocol   int32
+}
+
+type BLOB struct {
+	Size     uint32
+	BlobData *byte
+}