1 /*
   2  * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 
  30 #include <jni_util.h>
  31 
  32 #include "j2secmod.h"
  33 
  34 extern void throwNullPointerException(JNIEnv *env, const char *message);
  35 extern void throwIOException(JNIEnv *env, const char *message);
  36 
  37 void *findFunction(JNIEnv *env, jlong jHandle, const char *functionName) {
  38     HINSTANCE hModule = (HINSTANCE)jHandle;
  39     void *fAddress = GetProcAddress(hModule, functionName);
  40     if (fAddress == NULL) {
  41         char errorMessage[256];
  42         _snprintf(errorMessage, sizeof(errorMessage), "Symbol not found: %s", functionName);
  43         throwNullPointerException(env, errorMessage);
  44         return NULL;
  45     }
  46     return fAddress;
  47 }
  48 
  49 JNIEXPORT jlong JNICALL Java_sun_security_pkcs11_Secmod_nssGetLibraryHandle
  50   (JNIEnv *env, jclass thisClass, jstring jLibName)
  51 {
  52     const char *libName = (*env)->GetStringUTFChars(env, jLibName, NULL);
  53     HMODULE hModule = GetModuleHandle(libName);
  54     dprintf2("-handle for %s: %d\n", libName, hModule);
  55     (*env)->ReleaseStringUTFChars(env, jLibName, libName);
  56     return (jlong)hModule;
  57 }
  58 
  59 JNIEXPORT jlong JNICALL Java_sun_security_pkcs11_Secmod_nssLoadLibrary
  60   (JNIEnv *env, jclass thisClass, jstring jName)
  61 {
  62     HINSTANCE hModule;
  63     LPVOID lpMsgBuf;
  64 
  65     const char *libName = (*env)->GetStringUTFChars(env, jName, NULL);
  66     dprintf1("-lib %s\n", libName);
  67 
  68     hModule = LoadLibrary(libName);
  69     (*env)->ReleaseStringUTFChars(env, jName, libName);
  70 
  71     if (hModule == NULL) {
  72         FormatMessage(
  73             FORMAT_MESSAGE_ALLOCATE_BUFFER |
  74             FORMAT_MESSAGE_FROM_SYSTEM |
  75             FORMAT_MESSAGE_IGNORE_INSERTS,
  76             NULL,
  77             GetLastError(),
  78             0, /* Default language */
  79             (LPTSTR) &lpMsgBuf,
  80             0,
  81             NULL
  82         );
  83         dprintf1("-error: %s\n", lpMsgBuf);
  84         throwIOException(env, (char*)lpMsgBuf);
  85         LocalFree(lpMsgBuf);
  86         return 0;
  87     }
  88     dprintf2("-handle: %d (0X%X)\n", hModule, hModule);
  89     return (jlong)hModule;
  90 }