/* network.h
* 
* Datatypes, functions and includes for the core networking.
* 
 
    Copyright (C) 2013 Tox project All Rights Reserved.

    This file is part of Tox.

    Tox 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.

    Tox 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 Tox.  If not, see <http://www.gnu.org/licenses/>.
    
*/
 

#ifndef NETWORK_H 
#define NETWORK_H 

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <time.h>



#ifdef WIN32 /* Put win32 includes here */
//Windows XP
#define WINVER 0x0501
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>

#undef VANILLA_NACL /* make sure on windows we use libsodium */

#else //Linux includes

#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h> 
#include <netdb.h>

#endif

#ifndef VANILLA_NACL
/* we use libsodium by default */
#include <sodium.h>
#else

/* TODO: Including stuff like this is bad. This needs fixing.
   We keep support for the original NaCl for now. */
#include "../nacl/build/Linux/include/amd64/crypto_box.h"

#endif

#ifdef __cplusplus
extern "C" {
#endif

#define MAX_UDP_PACKET_SIZE 65507

typedef union
{
    uint8_t c[4];
    uint16_t s[2];
    uint32_t i;
}IP;

typedef struct
{
    IP ip;
    uint16_t port;
    /* not used for anything right now */
    uint16_t padding; 
}IP_Port;

typedef struct
{
    int16_t family;
    uint16_t port;
    IP ip;
    uint8_t zeroes[8];
    #ifdef ENABLE_IPV6
    uint8_t zeroes2[12];
    #endif
}ADDR;


/* returns current time in milleseconds since the epoch. */
uint64_t current_time();

/* return a random number
   NOTE: this function should probably not be used where cryptographic randomness is absolutely necessary */
uint32_t random_int();

/* Basic network functions: */

/* Function to send packet(data) of length length to ip_port */
int sendpacket(IP_Port ip_port, uint8_t * data, uint32_t length);

/* Function to receive data, ip and port of sender is put into ip_port
   the packet data into data
   the packet length into length. */
int receivepacket(IP_Port * ip_port, uint8_t * data, uint32_t * length);

/* initialize networking
   bind to ip and port
   ip must be in network order EX: 127.0.0.1 = (7F000001)
   port is in host byte order (this means don't worry about it)
   returns 0 if no problems
   TODO: add something to check if there are errors */
int init_networking(IP ip ,uint16_t port);


/* function to cleanup networking stuff(doesn't do much right now) */
void shutdown_networking();

/* resolves provided address to a binary data in network byte order
   address is ASCII null terminated string
   address should represent IPv4, IPv6 or a hostname
   on success returns a data in network byte order that can be used to set IP.i or IP_Port.ip.i
   on failure returns -1 */
int resolve_addr(char *address);

#ifdef __cplusplus
}
#endif

#endif