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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methods used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun 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 3 of the License, or
* any later version.
*
* Anytun 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 Anytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef ANYTUN_cryptinit_hpp_INCLUDED
#define ANYTUN_cryptinit_hpp_INCLUDED
#ifndef NO_CRYPT
#if defined(USE_GCRYPT)
#include <gcrypt.h>
// boost thread callbacks for libgcrypt
static int boost_mutex_init(void** priv)
{
boost::mutex* lock = new boost::mutex();
if(!lock) {
return ENOMEM;
}
*priv = lock;
return 0;
}
static int boost_mutex_destroy(void** lock)
{
delete reinterpret_cast<boost::mutex*>(*lock);
return 0;
}
static int boost_mutex_lock(void** lock)
{
reinterpret_cast<boost::mutex*>(*lock)->lock();
return 0;
}
static int boost_mutex_unlock(void** lock)
{
reinterpret_cast<boost::mutex*>(*lock)->unlock();
return 0;
}
static struct gcry_thread_cbs gcry_threads_boost = {
GCRY_THREAD_OPTION_USER, NULL,
boost_mutex_init, boost_mutex_destroy,
boost_mutex_lock, boost_mutex_unlock
};
#define MIN_GCRYPT_VERSION "1.2.0"
bool initLibGCrypt()
{
// make libgcrypt thread safe
// this must be called before any other libgcrypt call
gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_boost);
// this must be called right after the GCRYCTL_SET_THREAD_CBS command
// no other function must be called till now
if(!gcry_check_version(MIN_GCRYPT_VERSION)) {
std::cout << "initLibGCrypt: Invalid Version of libgcrypt, should be >= " << MIN_GCRYPT_VERSION << std::endl;
return false;
}
gcry_error_t err = gcry_control(GCRYCTL_DISABLE_SECMEM, 0);
if(err) {
std::cout << "initLibGCrypt: Failed to disable secure memory: " << AnytunGpgError(err) << std::endl;
return false;
}
// Tell Libgcrypt that initialization has completed.
err = gcry_control(GCRYCTL_INITIALIZATION_FINISHED);
if(err) {
std::cout << "initLibGCrypt: Failed to finish initialization: " << AnytunGpgError(err) << std::endl;
return false;
}
cLog.msg(Log::PRIO_NOTICE) << "initLibGCrypt: libgcrypt init finished";
return true;
}
#endif
#endif
bool initCrypto()
{
#ifndef NO_CRYPT
#if defined(USE_SSL_CRYPTO)
return true;
#elif defined(USE_NETTLE)
return true;
#else // USE_GCRYPT is the default
return initLibGCrypt();
#endif
#else
return true;
#endif
}
#endif
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