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/* 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 */
#ifndef WINVER
//Windows XP
#define WINVER 0x0501
#endif
#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>
#include <unistd.h>
#endif
#ifndef VANILLA_NACL
/* we use libsodium by default */
#include <sodium.h>
#else
#include <crypto_box.h>
#define crypto_box_MACBYTES (crypto_box_ZEROBYTES - crypto_box_BOXZEROBYTES)
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_UDP_PACKET_SIZE 65507
#define NET_PACKET_PING_REQUEST 0 /* Ping request packet ID */
#define NET_PACKET_PING_RESPONSE 1 /* Ping response packet ID */
#define NET_PACKET_GET_NODES 2 /* Get nodes request packet ID */
#define NET_PACKET_SEND_NODES 3 /* Send nodes response packet ID */
#define NET_PACKET_HANDSHAKE 16 /* Handshake packet ID */
#define NET_PACKET_SYNC 17 /* SYNC packet ID */
#define NET_PACKET_DATA 18 /* Data packet ID */
#define NET_PACKET_CRYPTO 32 /* Encrypted data packet ID */
#define NET_PACKET_LAN_DISCOVERY 33 /* LAN discovery packet ID */
/* Current time, unix format */
#define unix_time() ((uint64_t)time(NULL))
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;
/* Function to receive data, ip and port of sender is put into ip_port
the packet data into data
the packet length into length. */
typedef int (*packet_handler_callback)(void *object, IP_Port ip_port, uint8_t *data, uint32_t len);
typedef struct {
packet_handler_callback function;
void *object;
} Packet_Handles;
typedef struct {
Packet_Handles packethandlers[256];
/* our UDP socket */
int sock;
} Networking_Core;
/* returns current time in milleseconds since the epoch. */
uint64_t current_time(void);
/* return a random number
NOTE: this function should probably not be used where cryptographic randomness is absolutely necessary */
uint32_t random_int(void);
/* Basic network functions: */
/* Function to send packet(data) of length length to ip_port */
int sendpacket(int sock, IP_Port ip_port, uint8_t *data, uint32_t length);
/* Function to call when packet beginning with byte is received */
void networking_registerhandler(Networking_Core *net, uint8_t byte, packet_handler_callback cb, void *object);
/* call this several times a second */
void networking_poll(Networking_Core *net);
/* 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
returns -1 if there were problems */
Networking_Core *new_networking(IP ip, uint16_t port);
/* function to cleanup networking stuff(doesn't do much right now) */
void kill_networking(Networking_Core *net);
#ifdef __cplusplus
}
#endif
#endif
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