windows: add Windows directory accessors
These are useful for the same reason that the already existing
GetSystemDirectory is.
Change-Id: I3041ce6cbeb66a4f8a5960fbaf39381c8c9c80d6
Reviewed-on: https://go-review.googlesource.com/c/sys/+/191837
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/windows/security_windows.go b/windows/security_windows.go
index 61b4964..7dfe201 100644
--- a/windows/security_windows.go
+++ b/windows/security_windows.go
@@ -644,6 +644,8 @@
//sys DuplicateTokenEx(existingToken Token, desiredAccess uint32, tokenAttributes *SecurityAttributes, impersonationLevel uint32, tokenType uint32, newToken *Token) (err error) = advapi32.DuplicateTokenEx
//sys GetUserProfileDirectory(t Token, dir *uint16, dirLen *uint32) (err error) = userenv.GetUserProfileDirectoryW
//sys getSystemDirectory(dir *uint16, dirLen uint32) (len uint32, err error) = kernel32.GetSystemDirectoryW
+//sys getWindowsDirectory(dir *uint16, dirLen uint32) (len uint32, err error) = kernel32.GetWindowsDirectoryW
+//sys getSystemWindowsDirectory(dir *uint16, dirLen uint32) (len uint32, err error) = kernel32.GetSystemWindowsDirectoryW
// An access token contains the security information for a logon session.
// The system creates an access token when a user logs on, and every
@@ -785,8 +787,8 @@
return linkedToken, nil
}
-// GetSystemDirectory retrieves path to current location of the system
-// directory, which is typically, though not always, C:\Windows\System32.
+// GetSystemDirectory retrieves the path to current location of the system
+// directory, which is typically, though not always, `C:\Windows\System32`.
func GetSystemDirectory() (string, error) {
n := uint32(MAX_PATH)
for {
@@ -802,6 +804,42 @@
}
}
+// GetWindowsDirectory retrieves the path to current location of the Windows
+// directory, which is typically, though not always, `C:\Windows`. This may
+// be a private user directory in the case that the application is running
+// under a terminal server.
+func GetWindowsDirectory() (string, error) {
+ n := uint32(MAX_PATH)
+ for {
+ b := make([]uint16, n)
+ l, e := getWindowsDirectory(&b[0], n)
+ if e != nil {
+ return "", e
+ }
+ if l <= n {
+ return UTF16ToString(b[:l]), nil
+ }
+ n = l
+ }
+}
+
+// GetSystemWindowsDirectory retrieves the path to current location of the
+// Windows directory, which is typically, though not always, `C:\Windows`.
+func GetSystemWindowsDirectory() (string, error) {
+ n := uint32(MAX_PATH)
+ for {
+ b := make([]uint16, n)
+ l, e := getSystemWindowsDirectory(&b[0], n)
+ if e != nil {
+ return "", e
+ }
+ if l <= n {
+ return UTF16ToString(b[:l]), nil
+ }
+ n = l
+ }
+}
+
// IsMember reports whether the access token t is a member of the provided SID.
func (t Token) IsMember(sid *SID) (bool, error) {
var b int32
diff --git a/windows/syscall_test.go b/windows/syscall_test.go
index f09c6dd..7e28834 100644
--- a/windows/syscall_test.go
+++ b/windows/syscall_test.go
@@ -62,3 +62,20 @@
t.Fatalf("System directory does not end in system32: %s", d)
}
}
+
+func TestGetWindowsDirectory(t *testing.T) {
+ d1, err := windows.GetWindowsDirectory()
+ if err != nil {
+ t.Fatalf("Failed to get Windows directory: %s", err)
+ }
+ d2, err := windows.GetSystemWindowsDirectory()
+ if err != nil {
+ t.Fatalf("Failed to get system Windows directory: %s", err)
+ }
+ if !strings.HasSuffix(strings.ToLower(d1), `\windows`) {
+ t.Fatalf("Windows directory does not end in windows: %s", d1)
+ }
+ if !strings.HasSuffix(strings.ToLower(d2), `\windows`) {
+ t.Fatalf("System Windows directory does not end in windows: %s", d2)
+ }
+}
diff --git a/windows/zsyscall_windows.go b/windows/zsyscall_windows.go
index 0f600db..1c275cb 100644
--- a/windows/zsyscall_windows.go
+++ b/windows/zsyscall_windows.go
@@ -305,6 +305,8 @@
procDuplicateTokenEx = modadvapi32.NewProc("DuplicateTokenEx")
procGetUserProfileDirectoryW = moduserenv.NewProc("GetUserProfileDirectoryW")
procGetSystemDirectoryW = modkernel32.NewProc("GetSystemDirectoryW")
+ procGetWindowsDirectoryW = modkernel32.NewProc("GetWindowsDirectoryW")
+ procGetSystemWindowsDirectoryW = modkernel32.NewProc("GetSystemWindowsDirectoryW")
procWTSQueryUserToken = modwtsapi32.NewProc("WTSQueryUserToken")
procWTSEnumerateSessionsW = modwtsapi32.NewProc("WTSEnumerateSessionsW")
procWTSFreeMemory = modwtsapi32.NewProc("WTSFreeMemory")
@@ -3332,6 +3334,32 @@
return
}
+func getWindowsDirectory(dir *uint16, dirLen uint32) (len uint32, err error) {
+ r0, _, e1 := syscall.Syscall(procGetWindowsDirectoryW.Addr(), 2, uintptr(unsafe.Pointer(dir)), uintptr(dirLen), 0)
+ len = uint32(r0)
+ if len == 0 {
+ if e1 != 0 {
+ err = errnoErr(e1)
+ } else {
+ err = syscall.EINVAL
+ }
+ }
+ return
+}
+
+func getSystemWindowsDirectory(dir *uint16, dirLen uint32) (len uint32, err error) {
+ r0, _, e1 := syscall.Syscall(procGetSystemWindowsDirectoryW.Addr(), 2, uintptr(unsafe.Pointer(dir)), uintptr(dirLen), 0)
+ len = uint32(r0)
+ if len == 0 {
+ if e1 != 0 {
+ err = errnoErr(e1)
+ } else {
+ err = syscall.EINVAL
+ }
+ }
+ return
+}
+
func WTSQueryUserToken(session uint32, token *Token) (err error) {
r1, _, e1 := syscall.Syscall(procWTSQueryUserToken.Addr(), 2, uintptr(session), uintptr(unsafe.Pointer(token)), 0)
if r1 == 0 {
