add a load button

- when changing the PKCS#11 library path in the options dialog
   a load button tries to load the lib and informs
   about failure or success

lib/pkcs11.cpp

@@ -43,6 +43,9 @@ CK_SLOT_ID *pkcs11::getSlotList(unsigned long *num_slots)
 	CK_RV rv;
 	CK_SLOT_ID *p11_slots = NULL;
 
+	*num_slots = 0;
+	/* This one helps to avoid errors.
+	 * Fist time it fails, 2nd time it works */
 	p11->C_GetSlotList(CK_TRUE, p11_slots, num_slots);
 	do {
 		rv = p11->C_GetSlotList(CK_TRUE, p11_slots, num_slots);

lib/pki_scard.cpp

@@ -24,7 +24,6 @@
 #include "db_base.h"
 #include "pkcs11.h"
 
-
 #if defined(_WIN32) || defined(USE_CYGWIN)
 #define PKCS11_DEFAULT_MODULE_NAME      "opensc-pkcs11.dll"
 #define ENGINE_LIB			"engine_pkcs11.dll"
@@ -75,8 +74,10 @@ bool pki_scard::init_p11engine(QString file, bool silent)
 	XCA_ENGINE_cmd(e, "MODULE_PATH",  CCHAR(file));
 
 	ENGINE_init(e);
+	if (ERR_peek_error() != 0)
+		return false;
 	p11_engine = e;
-	return 1;
+	return true;
 }
 
 void pki_scard::init(void)
@@ -173,6 +174,8 @@ int pki_scard::prepare_card() const
 		return -1;
 	while (1) {
 		p11_slots = p11.getSlotList(&num_slots);
+		if (p11_slots)
+			free(p11_slots);
 		for (i=0; i<num_slots; i++) {
 			pkcs11 myp11;
 			QStringList sl = myp11.tokenInfo(i);

ui/Options.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>437</width>
-    <height>455</height>
+    <width>494</width>
+    <height>398</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -151,7 +151,7 @@ p, li { white-space: pre-wrap; }
      <item>
       <widget class="QLabel" name="label_2">
        <property name="text">
-        <string>PKCS11 Library path: </string>
+        <string>PKCS#11 path: </string>
        </property>
       </widget>
      </item>
@@ -178,6 +178,13 @@ p, li { white-space: pre-wrap; }
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QPushButton" name="tryLoadButton">
+       <property name="text">
+        <string>Load</string>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item>

widgets/MW_menu.cpp

@@ -169,20 +169,15 @@ void MainWindow::setOptions()
 				string_opt.length()+1, 1, setting,"string_opt");
 	}
 	QString newpath = opt->pkcs11path->text();
-	QString old_pkcs11path = pkcs11path;
-	if (newpath != pkcs11path || !pkcs11::loaded()) {
+	if (newpath != pkcs11path) {
+		pkcs11path = newpath;
+		mydb.set((const unsigned char *) CCHAR(pkcs11path),
+			pkcs11path.length()+1, 1,setting, "pkcs11path");
 		try {
-			if (newpath.isEmpty())
-				pkcs11path = newpath;
-			if (pki_scard::init_p11engine(newpath, false))
-				pkcs11path = newpath;
+			pki_scard::init_p11engine(pkcs11path, true);
 		} catch (errorEx &err) {
 			Error(err);
 		}
-		if (pkcs11path != old_pkcs11path) {
-			mydb.set((const unsigned char *) CCHAR(pkcs11path),
-				pkcs11path.length()+1, 1,setting, "pkcs11path");
-		}
 	}
 	scardMenuAction->setEnabled(pkcs11::loaded());
 }

widgets/Options.cpp

@@ -6,11 +6,14 @@
  */
 
 #include "Options.h"
+#include "lib/pki_scard.h"
 #include <openssl/objects.h>
+#include <qmessagebox.h>
 
-Options::Options(QWidget *parent)
+Options::Options(MainWindow *parent)
 	:QDialog(parent)
 {
+	mw = parent;
 	QStringList dnl;
 	if (!MainWindow::mandatory_dn.isEmpty())
 		dnl = MainWindow::mandatory_dn.split(",");
@@ -82,3 +85,25 @@ void Options::on_fileButton_clicked(void)
 	pkcs11path->setText(fname);
 }
 
+
+void Options::on_tryLoadButton_clicked(void)
+{
+	unsigned long num_slots;
+	CK_SLOT_ID *p11_slots = NULL;
+
+	try {
+		QString lib = pkcs11path->text();
+		pki_scard::init_p11engine(lib, false);
+		pkcs11 p11;
+		p11_slots = p11.getSlotList(&num_slots);
+		if (!lib.isEmpty()) {
+			QMessageBox::information(this, XCA_TITLE,
+				tr("Successfully loaded PKCS#11 library: ") + lib,
+				tr("Ok"));
+		}
+	} catch (errorEx &err) {
+		mw->Error(err);
+	}
+	if (p11_slots)
+		free(p11_slots);
+}

widgets/Options.h

@@ -18,8 +18,9 @@ class Options: public QDialog, public Ui::Options
 		Q_OBJECT
 	private:
 		QStringList string_opts;
+		MainWindow *mw;
 	public:
-		Options(QWidget *parent);
+		Options(MainWindow *parent);
 	public slots:
 		void on_extDNadd_clicked();
 		void on_extDNdel_clicked();
@@ -27,6 +28,7 @@ class Options: public QDialog, public Ui::Options
 		void setStringOpt(const QString string_opt);
 		QString getStringOpt();
 		void on_fileButton_clicked(void);
+		void on_tryLoadButton_clicked(void);
 };
 
 #endif