go.sys/windows: apply latest syscall changes

71db3dc120af os: make SameFile handle paths like c:a.txt properly
ff34a3e84dc0 net: fix CNAME resolving on Windows

LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/130250043

windows/exec_windows.go

@@ -130,9 +130,8 @@ func SetNonblock(fd Handle, nonblocking bool) (err error) {
 	return nil
 }
 
-// getFullPath retrieves the full path of the specified file.
-// Just a wrapper for Windows GetFullPathName api.
-func getFullPath(name string) (path string, err error) {
+// FullPath retrieves the full path of the specified file.
+func FullPath(name string) (path string, err error) {
 	p, err := UTF16PtrFromString(name)
 	if err != nil {
 		return "", err
@@ -161,7 +160,7 @@ func isSlash(c uint8) bool {
 }
 
 func normalizeDir(dir string) (name string, err error) {
-	ndir, err := getFullPath(dir)
+	ndir, err := FullPath(dir)
 	if err != nil {
 		return "", err
 	}
@@ -200,9 +199,9 @@ func joinExeDirAndFName(dir, p string) (name string, err error) {
 				return "", err
 			}
 			if volToUpper(int(p[0])) == volToUpper(int(d[0])) {
-				return getFullPath(d + "\\" + p[2:])
+				return FullPath(d + "\\" + p[2:])
 			} else {
-				return getFullPath(p)
+				return FullPath(p)
 			}
 		}
 	} else {
@@ -212,9 +211,9 @@ func joinExeDirAndFName(dir, p string) (name string, err error) {
 			return "", err
 		}
 		if isSlash(p[0]) {
-			return getFullPath(d[:2] + p)
+			return FullPath(d[:2] + p)
 		} else {
-			return getFullPath(d + "\\" + p)
+			return FullPath(d + "\\" + p)
 		}
 	}
 	// we shouldn't be here

windows/syscall_windows.go

@@ -515,6 +515,7 @@ const socket_error = uintptr(^uint32(0))
 //sys	GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname
 //sys	DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W
 //sys	DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree
+//sys	DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W
 //sys	GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW
 //sys	FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW
 //sys	GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry

windows/zsyscall_windows.go

@@ -140,6 +140,7 @@ var (
 	procgetprotobyname                     = modws2_32.NewProc("getprotobyname")
 	procDnsQuery_W                         = moddnsapi.NewProc("DnsQuery_W")
 	procDnsRecordListFree                  = moddnsapi.NewProc("DnsRecordListFree")
+	procDnsNameCompare_W                   = moddnsapi.NewProc("DnsNameCompare_W")
 	procGetAddrInfoW                       = modws2_32.NewProc("GetAddrInfoW")
 	procFreeAddrInfoW                      = modws2_32.NewProc("FreeAddrInfoW")
 	procGetIfEntry                         = modiphlpapi.NewProc("GetIfEntry")
@@ -1635,6 +1636,12 @@ func DnsRecordListFree(rl *DNSRecord, freetype uint32) {
 	return
 }
 
+func DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) {
+	r0, _, _ := syscall.Syscall(procDnsNameCompare_W.Addr(), 2, uintptr(unsafe.Pointer(name1)), uintptr(unsafe.Pointer(name2)), 0)
+	same = r0 != 0
+	return
+}
+
 func GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) {
 	r0, _, _ := syscall.Syscall6(procGetAddrInfoW.Addr(), 4, uintptr(unsafe.Pointer(nodename)), uintptr(unsafe.Pointer(servicename)), uintptr(unsafe.Pointer(hints)), uintptr(unsafe.Pointer(result)), 0, 0)
 	if r0 != 0 {

windows/ztypes_windows.go

@@ -694,6 +694,18 @@ const (
 	DNS_TYPE_NBSTAT  = 0xff01
 )
 
+const (
+	DNS_INFO_NO_RECORDS = 0x251D
+)
+
+const (
+	// flags inside DNSRecord.Dw
+	DnsSectionQuestion   = 0x0000
+	DnsSectionAnswer     = 0x0001
+	DnsSectionAuthority  = 0x0002
+	DnsSectionAdditional = 0x0003
+)
+
 type DNSSRVData struct {
 	Target   *uint16
 	Priority uint16