Fix crashed caused by using openssl from multiple threads simultanously.

Note that this doesn't make BigNumber class threadsafe - it never was that way.

src/server/shared/Cryptography/OpenSSLCrypto.cpp

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2008-2013 TrinityCore <http://www.trinitycore.org/>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <OpenSSLCrypto.h>
+#include <openssl/crypto.h>
+#include <ace/Thread_Mutex.h>
+#include <vector>
+#include <ace/Thread.h>
+
+std::vector<ACE_Thread_Mutex*> cryptoLocks;
+
+void lockingCallback(int mode, int type, const char *file, int line)
+{
+    if (mode & CRYPTO_LOCK)
+        cryptoLocks[type]->acquire();
+    else
+        cryptoLocks[type]->release();
+}
+
+void threadIdCallback(CRYPTO_THREADID * id)
+{
+    CRYPTO_THREADID_set_numeric(id, ACE_Thread::self());
+}
+
+void OpenSSLCrypto::threadsSetup()
+{
+    cryptoLocks.resize(CRYPTO_num_locks());
+    for(int i = 0 ; i < CRYPTO_num_locks(); ++i)
+    {
+        cryptoLocks[i] = new ACE_Thread_Mutex();
+    }
+    CRYPTO_THREADID_set_callback(threadIdCallback);
+    CRYPTO_set_locking_callback(lockingCallback);
+}
+
+void OpenSSLCrypto::threadsCleanup()
+{
+    CRYPTO_set_locking_callback(NULL);
+    CRYPTO_THREADID_set_callback(NULL);
+    for(int i = 0 ; i < CRYPTO_num_locks(); ++i)
+    {
+        delete cryptoLocks[i];
+    }
+    cryptoLocks.resize(0);
+}

src/server/shared/Cryptography/OpenSSLCrypto.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2008-2013 TrinityCore <http://www.trinitycore.org/>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef OPENSSL_CRYPTO_H
+#define OPENSSL_CRYPTO_H
+
+/**
+* A group of functions which setup openssl crypto module to work properly in multithreaded enviroment
+* If not setup properly - it will crash
+*/
+namespace OpenSSLCrypto
+{
+    /// Needs to be called before threads using openssl are spawned
+    void threadsSetup();
+    /// Needs to be called after threads using openssl are despawned
+    void threadsCleanup();
+}
+
+#endif

src/server/worldserver/Master.cpp

@@ -44,6 +44,7 @@
 #include "RealmList.h"
 
 #include "BigNumber.h"
+#include "OpenSSLCrypto.h"
 
 #ifdef _WIN32
 #include "ServiceWin32.h"
@@ -121,6 +122,7 @@ public:
 /// Main function
 int Master::Run()
 {
+    OpenSSLCrypto::threadsSetup();
     BigNumber seed1;
     seed1.SetRand(16 * 8);
 
@@ -368,6 +370,7 @@ int Master::Run()
     // fixes a memory leak related to detaching threads from the module
     //UnloadScriptingModule();
 
+    OpenSSLCrypto::threadsCleanup();
     // Exit the process with specified return value
     return World::GetExitCode();
 }