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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// OpenSSL multi-threading initialization
#include "chrome/browser/sync/engine/net/openssl_init.h"
#include <openssl/crypto.h>
#include "base/logging.h"
#include "chrome/browser/sync/util/compat-pthread.h"
#include "chrome/browser/sync/util/pthread_helpers.h"
// OpenSSL requires multithreading callbacks to be initialized prior to using
// the library so that it can manage thread locking as necessary.
// Dynamic lock type
//
// This needs to be a struct and in global scope because OpenSSL relies on some
// macro magic.
struct CRYPTO_dynlock_value {
PThreadMutex mutex;
void Lock() {
mutex.Lock();
}
void Unlock() {
mutex.Unlock();
}
};
namespace {
// This array stores all of the mutexes available to OpenSSL
PThreadMutex* mutex_buf = NULL;
// OpenSSL mutex handling callback functions
// OpenSSL Callback - Locks/unlocks the specified mutex held by OpenSSL.
void OpenSslMutexLockControl(int mode, int n, const char* file, int line) {
if (mode & CRYPTO_LOCK) {
mutex_buf[n].Lock();
} else {
mutex_buf[n].Unlock();
}
}
// OpenSSL Callback - Returns the thread ID
unsigned long OpenSslGetThreadID(void) {
return GetCurrentThreadId();
}
// Dynamic locking functions
// Allocate a new lock
struct CRYPTO_dynlock_value* dyn_create_function(const char* file, int line) {
return new CRYPTO_dynlock_value;
}
void dyn_lock_function(int mode, struct CRYPTO_dynlock_value* lock,
const char* file, int line) {
if (mode & CRYPTO_LOCK) {
lock->Lock();
} else {
lock->Unlock();
}
}
void dyn_destroy_function(struct CRYPTO_dynlock_value* lock,
const char* file, int line) {
delete lock;
}
} // namespace
// We want to log the version of the OpenSSL library being used, in particular
// for the case where it's dynamically linked. We want the version from the
// library, not from the header files. It seems the OpenSSL folks haven't
// bothered with an accessor for this, so we just pluck it out.
#ifdef OS_WINDOWS
// TODO(sync): Figure out how to get the SSL version string on Windows.
const char* SSL_version_str = "UNKNOWN";
#else
extern const char* SSL_version_str;
#endif
namespace browser_sync {
// Initializes the OpenSSL multithreading callbacks. This isn't thread-safe,
// but it is called early enough that it doesn't matter.
void InitOpenSslMultithreading() {
LOG(INFO) << "Using OpenSSL headers version " << OPENSSL_VERSION_TEXT
<< ", lib version " << SSL_version_str;
if (mutex_buf)
return;
mutex_buf = new PThreadMutex[CRYPTO_num_locks()];
CHECK(NULL != mutex_buf);
// OpenSSL has only one single global set of callbacks, so this
// initialization must be done only once, even though the OpenSSL lib may be
// used by multiple modules (jingle jabber connections and P2P tunnels).
CRYPTO_set_id_callback(OpenSslGetThreadID);
CRYPTO_set_locking_callback(OpenSslMutexLockControl);
CRYPTO_set_dynlock_create_callback(dyn_create_function);
CRYPTO_set_dynlock_lock_callback(dyn_lock_function);
CRYPTO_set_dynlock_destroy_callback(dyn_destroy_function);
}
// Cleans up the OpenSSL multithreading callbacks.
void CleanupOpenSslMultithreading() {
if (!mutex_buf) {
return;
}
CRYPTO_set_dynlock_create_callback(NULL);
CRYPTO_set_dynlock_lock_callback(NULL);
CRYPTO_set_dynlock_destroy_callback(NULL);
CRYPTO_set_id_callback(NULL);
CRYPTO_set_locking_callback(NULL);
delete [] mutex_buf;
mutex_buf = NULL;
}
} // namespace browser_sync
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