#if HAVE_CRT
 #define _CRTDBG_MAP_ALLOC 
 #include <stdlib.h> 
 #include <crtdbg.h>
 #endif //HAVE_CRT
 /*

 * Copyright (C) 2020, University of the Basque Country (UPV/EHU)

 * Contact for licensing options: <licensing-mcpttclient(at)mcopenplatform(dot)com>
 *
 * The original file was part of Open Source Doubango Framework
 * Copyright (C) 2010-2011 Mamadou Diop.
 * Copyright (C) 2012 Doubango Telecom <http://doubango.org>
 *
 * This file is part of Open Source Doubango Framework.
 *
 * DOUBANGO 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
 * (at your option) any later version.
 *
 * DOUBANGO 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 DOUBANGO.
 *
 */
 
 
 /**@file tnet.c
  * @brief Network stack.
  *
  * @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
  *
 
  */
 #include "tnet.h"
 #include "tnet_utils.h" 
 
 #include "tsk_time.h"
 #include "tsk_debug.h"
 
 #include <stdlib.h> /* srand */
 
 #if HAVE_OPENSSL
 #	include <openssl/ssl.h>
 #endif
 
 /** @mainpage tinyNET API Overview
 *
 * <h1>10 Sockets and Network Functions</h1>
 *
 * All network functions are part of tinyNET projects.<br>
 * You MUST call @ref tnet_startup() before using any network function (tnet_*). tnet_cleanup() is used to terminate use of network functions. <br>
 * The startup function will determine whether the host is a little-endian machine or not (at runtime).
 *
 * ======
 *
 * - @ref tnet_socket_group 
 * - @ref tnet_utils_group
 * - @ref tnet_dhcp_group
 * - @ref tnet_dhcp6_group
 * - @ref tnet_dns_group
 * - @ref tnet_nat_group (@ref tnet_stun_group, @ref tnet_turn_group, ICE)
 *
 * ======
 *
 * <table>
 * <tr> <td><b>LDFLAGS</b></td> <td>-ltinySAK</td> </tr>
 * <tr> <td><b>CFLAGS</b></td> <td>-Isrc -ItinySAK/src</td> </tr>
 * </table>
 *
 */
 static tsk_bool_t __tnet_started = tsk_false;
 tsk_bool_t tnet_isBigEndian = tsk_false;
 
 /**
  * @fn tnet_startup
  * This is probably the most important function. You MUST call this function to initialize the network stack before calling any <b>tnet_*</b> function. <br />
  * On windows, this function will call <a target=_blank href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms742213(v=vs.85).aspx">WSAStartup</a>. <br />
  * You MUST call @ref tnet_cleanup to cleanup the network stack if you no longer need to use networking function.
  *
  * @sa @ref tnet_cleanup.
  * @return 0 if succeed and error code otherwise. 
 **/
 int tnet_startup()
 {
 	int err = 0;
 	short word = 0x4321;
 
 	if(__tnet_started){
 		goto bail;
 	}
 
 	// rand()
 	srand((unsigned int) tsk_time_epoch());
 
 	// endianness
 	tnet_isBigEndian = ((*(int8_t *)&word) != 0x21);
 #if TNET_UNDER_WINDOWS
 	if(tnet_isBigEndian){
 		TSK_DEBUG_ERROR("Big endian on Windows machine. Is it right?");
 	}
 #endif
 
 #if TNET_UNDER_WINDOWS
 	{
 		WORD wVersionRequested;
 		WSADATA wsaData;
 
 		wVersionRequested = MAKEWORD(2, 2);
 
 		err = WSAStartup(wVersionRequested, &wsaData);
 		if (err != 0) {
 			fprintf(stderr, "WSAStartup failed with error: %d\n", err);
 			return -1;
 		}
 
 		if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2){
 			fprintf(stderr, "Could not find a usable version of Winsock.dll\n");
 			tnet_cleanup();
 			return -2;
 		}
 		else{
 			fprintf(stdout, "The Winsock 2.2 dll was found okay\n");
 		}
 	}
 #endif /* TNET_UNDER_WINDOWS */
 
 #if HAVE_OPENSSL
 	fprintf(stdout, "SSL is enabled :)\n");
 	SSL_library_init();
 	OpenSSL_add_all_algorithms();
 	SSL_load_error_strings();
 
 	fprintf(stdout, "DTLS supported: %s\n", tnet_dtls_is_supported() ? "yes" : "no");
 	fprintf(stdout, "DTLS-SRTP supported: %s\n", tnet_dtls_is_srtp_supported() ? "yes" : "no");
 #else
 	fprintf(stderr, "SSL is disabled :(\n");
 #endif
 	
 	__tnet_started = tsk_true;
 
 bail:
 	return err;
 }
 
 
 /**
  * Cleanup the network stack. <br />
  * On windows, this function will call <a target=_blank href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms741549(v=vs.85).aspx">WSACleanup</a>. <br />
  * @sa @ref tnet_startup.
  * @return 0 if succeed and non-zero error code otherwise.
 **/
 int tnet_cleanup()
 {
 	if(!__tnet_started){
 		goto bail;
 	}
 
 #if TNET_UNDER_WINDOWS
 	__tnet_started = tsk_false;
 	return WSACleanup();
 #else
 	__tnet_started = tsk_false;
 #endif
 
 bail:
 	return 0;
 }