check if "log_dir" exists or create it

main.c

@@ -41,6 +41,7 @@
 #include "openvpn-gui-res.h"
 #include "localization.h"
 #include "manage.h"
+#include "misc.h"
 
 #ifndef DISABLE_CHANGE_PASSWORD
 #include <openssl/evp.h>
@@ -170,6 +171,12 @@ int WINAPI _tWinMain (HINSTANCE hThisInstance,
     exit(1);
   }
 
+  if (!EnsureDirExists(o.log_dir))
+  {
+    ShowLocalizedMsg(IDS_ERR_CREATE_PATH, _T("log_dir"), o.log_dir);
+    exit(1);
+  }
+
   BuildFileList();
   if (!VerifyAutoConnections()) {
     exit(1);

misc.c

@@ -24,6 +24,8 @@
 #endif
 
 #include <windows.h>
+#include <tchar.h>
+#include <string.h>
 #include <stdlib.h>
 #include <malloc.h>
 
@@ -106,6 +108,42 @@ ManagementCommandFromInput(connection_t *c, LPCSTR fmt, HWND hDlg, int id)
 }
 
 
+/*
+ * Ensures the given directory exists, by checking for and
+ * creating missing parts of the path.
+ * If the path does not exist and cannot be created return FALSE.
+ */
+BOOL
+EnsureDirExists(LPTSTR dir)
+{
+    DWORD attr = GetFileAttributes(dir);
+    if (attr == INVALID_FILE_ATTRIBUTES)
+    {
+        DWORD error = GetLastError();
+        if (error == ERROR_PATH_NOT_FOUND)
+        {
+            LPTSTR pos = _tcsrchr(dir, '\\');
+            if (pos == NULL)
+                return FALSE;
+
+            *pos = '\0';
+            BOOL ret = EnsureDirExists(dir);
+            *pos = '\\';
+            if (ret == FALSE)
+                return FALSE;
+        }
+        else if (error != ERROR_FILE_NOT_FOUND)
+            return FALSE;
+
+        /* No error if directory already exists */
+        return (CreateDirectory(dir, NULL) == TRUE
+            ||  GetLastError() == ERROR_ALREADY_EXISTS);
+    }
+
+    return (attr & FILE_ATTRIBUTE_DIRECTORY ? TRUE : FALSE);
+}
+
+
 /*
  * Various string helper functions
  */

misc.h

@@ -24,6 +24,8 @@
 
 BOOL ManagementCommandFromInput(connection_t *, LPCSTR, HWND, int);
 
+BOOL EnsureDirExists(LPTSTR);
+
 BOOL streq(LPCSTR, LPCSTR);
 BOOL wcsbegins(LPCWSTR, LPCWSTR);
 BOOL wcseq(LPCWSTR, LPCWSTR);

openvpn-gui-res.h

@@ -166,6 +166,7 @@
 #define IDS_NFO_SERVICE_STOPPED         1306
 #define IDS_NFO_ACTIVE_CONN_EXIT        1307
 #define IDS_NFO_SERVICE_ACTIVE_EXIT     1308
+#define IDS_ERR_CREATE_PATH             1309
 
 /* Program Options Related */
 #define IDS_NFO_USAGE                   1401

res/openvpn-gui-res-de.rc

@@ -230,6 +230,7 @@ BEGIN
 
     /* main - Resources */
     IDS_ERR_OPEN_DEBUG_FILE "Fehler beim öffnen des Debugfiles (%s)."
+    IDS_ERR_CREATE_PATH "Fehler beim Erstellen des %s Pfads:\n%s"
     IDS_ERR_LOAD_RICHED20 "Kann RICHED20.DLL nicht laden."
     IDS_ERR_SHELL_DLL_VERSION "Die shell32.dll Versionsnummer ist zu niedrieg (0x%lx). Es müssen mindestens Version 5.0 installiert sein."
     IDS_ERR_GUI_ALREADY_RUNNING "Die OpenVPN GUI wurde bereits gestartet."

res/openvpn-gui-res-en.rc

@@ -228,6 +228,7 @@ BEGIN
                          "they reside in diffrent folders."
     /* main - Resources */
     IDS_ERR_OPEN_DEBUG_FILE "Error opening debug file (%s) for output."
+    IDS_ERR_CREATE_PATH "Could not create %s path:\n%s"
     IDS_ERR_LOAD_RICHED20 "Could not load RICHED20.DLL."
     IDS_ERR_SHELL_DLL_VERSION "Your shell32.dll version is to low (0x%lx). You need at least version 5.0."
     IDS_ERR_GUI_ALREADY_RUNNING "OpenVPN GUI is already running."