Abstain from GUI calls in rand_win.c in NT service context.

[openssl.git] / crypto / rand / rand_win.c

diff --git a/crypto/rand/rand_win.c b/crypto/rand/rand_win.c
index e609cc1aa14207850f70528d320f8cdcd350823f..02cce3417043c3d509f0ecc5c78507f272f40224 100644 (file)
--- a/crypto/rand/rand_win.c
+++ b/crypto/rand/rand_win.c
@@ -167,7 +167,7 @@ typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT);
 
 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
-typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, DWORD, DWORD);
+typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, DWORD, ULONG_PTR);
 typedef BOOL (WINAPI *HEAP32NEXT)(LPHEAPENTRY32);
 typedef BOOL (WINAPI *HEAP32LIST)(HANDLE, LPHEAPLIST32);
 typedef BOOL (WINAPI *PROCESS32)(HANDLE, LPPROCESSENTRY32);
@@ -195,21 +195,8 @@ int RAND_poll(void)
        HCRYPTPROV hProvider = 0;
        BYTE buf[64];
        DWORD w;
-       HWND h;
        int good = 0;
 
-       HMODULE advapi, kernel, user, netapi;
-       CRYPTACQUIRECONTEXTW acquire = 0;
-       CRYPTGENRANDOM gen = 0;
-       CRYPTRELEASECONTEXT release = 0;
-#if 1 /* There was previously a problem with NETSTATGET.  Currently, this
-       * section is still experimental, but if all goes well, this conditional
-       * will be removed
-       */
-       NETSTATGET netstatget = 0;
-       NETFREE netfree = 0;
-#endif /* 1 */
-
        /* Determine the OS version we are on so we can turn off things 
         * that do not work properly.
         */
@@ -246,17 +233,18 @@ int RAND_poll(void)
         * implement own shim routine, which would accept ANSI argument
         * and expand it to Unicode.
         */
-
+       {
        /* load functions dynamically - not available on all systems */
-       advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
-       kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
-       user = LoadLibrary(TEXT("USER32.DLL"));
-       netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
-
-#if 1 /* There was previously a problem with NETSTATGET.  Currently, this
-       * section is still experimental, but if all goes well, this conditional
-       * will be removed
-       */
+       HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
+       HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
+       HMODULE user = NULL;
+       HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
+       CRYPTACQUIRECONTEXTW acquire = NULL;
+       CRYPTGENRANDOM gen = NULL;
+       CRYPTRELEASECONTEXT release = NULL;
+       NETSTATGET netstatget = NULL;
+       NETFREE netfree = NULL;
+
        if (netapi)
                {
                netstatget = (NETSTATGET) GetProcAddress(netapi,"NetStatisticsGet");
@@ -286,7 +274,6 @@ int RAND_poll(void)
 
        if (netapi)
                FreeLibrary(netapi);
-#endif /* 1 */
 
         /* It appears like this can cause an exception deep within ADVAPI32.DLL
          * at random times on Windows 2000.  Reported by Jeffrey Altman.  
@@ -394,7 +381,9 @@ int RAND_poll(void)
         if (advapi)
                FreeLibrary(advapi);
 
-       if (user)
+       if ((osverinfo.dwPlatformId != VER_PLATFORM_WIN32_NT ||
+            !OPENSSL_isservice()) &&
+           (user = LoadLibrary(TEXT("USER32.DLL"))))
                {
                GETCURSORINFO cursor;
                GETFOREGROUNDWINDOW win;
@@ -407,7 +396,7 @@ int RAND_poll(void)
                if (win)
                        {
                        /* window handle */
-                       h = win();
+                       HWND h = win();
                        RAND_add(&h, sizeof(h), 0);
                        }
                if (cursor)
@@ -570,6 +559,7 @@ int RAND_poll(void)
 
                FreeLibrary(kernel);
                }
+       }
 #endif /* !OPENSSL_SYS_WINCE */
 
        /* timer data */
@@ -633,8 +623,7 @@ int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
 void RAND_screen(void) /* function available for backward compatibility */
 {
        RAND_poll();
-       if (GetVersion() >= 0x80000000 || !OPENSSL_isservice())
-               readscreen();
+       readscreen();
 }
 
 
@@ -710,6 +699,9 @@ static void readscreen(void)
   int          y;              /* y-coordinate of screen lines to grab */
   int          n = 16;         /* number of screen lines to grab at a time */
 
+  if (GetVersion() >= 0x80000000 || !OPENSSL_isservice())
+    return;
+
   /* Create a screen DC and a memory DC compatible to screen DC */
   hScrDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
   hMemDC = CreateCompatibleDC(hScrDC);