/
netcode.c
executable file
·9036 lines (6936 loc) · 331 KB
/
netcode.c
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/*
netcode
Copyright © 2017 - 2024, Mas Bandwidth LLC
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "netcode.h"
#include <stdlib.h>
#include <memory.h>
#include <stdio.h>
#include <stdarg.h>
#include <inttypes.h>
#include <math.h>
#include <time.h>
#ifdef _MSC_VER
#define SODIUM_STATIC
#pragma warning(disable:4996)
#endif // #ifdef _MSC_VER
#include <sodium.h>
#define NETCODE_SOCKET_IPV6 1
#define NETCODE_SOCKET_IPV4 2
#define NETCODE_CONNECT_TOKEN_NONCE_BYTES 24
#define NETCODE_CONNECT_TOKEN_PRIVATE_BYTES 1024
#define NETCODE_CHALLENGE_TOKEN_BYTES 300
#define NETCODE_VERSION_INFO_BYTES 13
#define NETCODE_MAX_PACKET_BYTES 1300
#define NETCODE_MAX_PAYLOAD_BYTES 1200
#define NETCODE_MAX_ADDRESS_STRING_LENGTH 256
#define NETCODE_PACKET_QUEUE_SIZE 256
#define NETCODE_REPLAY_PROTECTION_BUFFER_SIZE 256
#define NETCODE_CLIENT_MAX_RECEIVE_PACKETS 64
#define NETCODE_SERVER_MAX_RECEIVE_PACKETS ( 64 * NETCODE_MAX_CLIENTS )
#define NETCODE_CLIENT_SOCKET_SNDBUF_SIZE ( 256 * 1024 )
#define NETCODE_CLIENT_SOCKET_RCVBUF_SIZE ( 256 * 1024 )
#define NETCODE_SERVER_SOCKET_SNDBUF_SIZE ( 4 * 1024 * 1024 )
#define NETCODE_SERVER_SOCKET_RCVBUF_SIZE ( 4 * 1024 * 1024 )
#define NETCODE_VERSION_INFO ( (uint8_t*) "NETCODE 1.02" )
#define NETCODE_PACKET_SEND_RATE 10.0
#define NETCODE_NUM_DISCONNECT_PACKETS 10
#define NETCODE_ADDRESS_MAP_BUCKETS NETCODE_MAX_CLIENTS
#ifndef NETCODE_ENABLE_TESTS
#define NETCODE_ENABLE_TESTS 0
#endif // #ifndef NETCODE_ENABLE_TESTS
#ifndef NETCODE_ENABLE_LOGGING
#define NETCODE_ENABLE_LOGGING 1
#endif // #ifndef NETCODE_ENABLE_LOGGING
// ------------------------------------------------------------------
static void netcode_default_assert_handler( NETCODE_CONST char * condition, NETCODE_CONST char * function, NETCODE_CONST char * file, int line )
{
printf( "assert failed: ( %s ), function %s, file %s, line %d\n", condition, function, file, line );
#if defined( __GNUC__ )
__builtin_trap();
#elif defined( _MSC_VER )
__debugbreak();
#endif
exit( 1 );
}
static int log_level;
static int (*printf_function)( NETCODE_CONST char *, ... ) = ( int (*)( NETCODE_CONST char *, ... ) ) printf;
void (*netcode_assert_function)( NETCODE_CONST char *, NETCODE_CONST char *, NETCODE_CONST char * file, int line ) = netcode_default_assert_handler;
void netcode_log_level( int level )
{
log_level = level;
}
void netcode_set_printf_function( int (*function)( NETCODE_CONST char *, ... ) )
{
netcode_assert( function );
printf_function = function;
}
void netcode_set_assert_function( void (*function)( NETCODE_CONST char *, NETCODE_CONST char *, NETCODE_CONST char * file, int line ) )
{
netcode_assert_function = function;
}
#if NETCODE_ENABLE_LOGGING
void netcode_printf( int level, NETCODE_CONST char * format, ... )
{
if ( level > log_level )
return;
va_list args;
va_start( args, format );
char buffer[4*1024];
vsnprintf( buffer, sizeof(buffer), format, args );
printf_function( "%s", buffer );
va_end( args );
}
#else // #if NETCODE_ENABLE_LOGGING
void netcode_printf( int level, NETCODE_CONST char * format, ... )
{
(void) level;
(void) format;
}
#endif // #if NETCODE_ENABLE_LOGGING
void * netcode_default_allocate_function( void * context, size_t bytes )
{
(void) context;
return malloc( bytes );
}
void netcode_default_free_function( void * context, void * pointer )
{
(void) context;
free( pointer );
}
// ------------------------------------------------------------------
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
#define NOMINMAX
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <winsock2.h>
#include <ws2tcpip.h>
#include <ws2ipdef.h>
#include <iphlpapi.h>
#pragma comment( lib, "WS2_32.lib" )
#pragma comment( lib, "IPHLPAPI.lib" )
#ifdef SetPort
#undef SetPort
#endif // #ifdef SetPort
#include <iphlpapi.h>
#pragma comment( lib, "IPHLPAPI.lib" )
#elif NETCODE_PLATFORM == NETCODE_PLATFORM_MAC || NETCODE_PLATFORM == NETCODE_PLATFORM_UNIX
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <fcntl.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#else
#error netcode - unknown platform!
#endif
int netcode_parse_address( NETCODE_CONST char * address_string_in, struct netcode_address_t * address )
{
netcode_assert( address_string_in );
netcode_assert( address );
memset( address, 0, sizeof( struct netcode_address_t ) );
// first try to parse the string as an IPv6 address:
// 1. if the first character is '[' then it's probably an ipv6 in form "[addr6]:portnum"
// 2. otherwise try to parse as a raw IPv6 address using inet_pton
#define NETCODE_ADDRESS_BUFFER_SAFETY 32
char buffer[NETCODE_MAX_ADDRESS_STRING_LENGTH + NETCODE_ADDRESS_BUFFER_SAFETY*2];
char * address_string = buffer + NETCODE_ADDRESS_BUFFER_SAFETY;
strncpy( address_string, address_string_in, NETCODE_MAX_ADDRESS_STRING_LENGTH - 1 );
address_string[NETCODE_MAX_ADDRESS_STRING_LENGTH-1] = '\0';
int address_string_length = (int) strlen( address_string );
if ( address_string[0] == '[' )
{
int base_index = address_string_length - 1;
int i;
for ( i = 0; i < 6; i++ ) // note: no need to search past 6 characters as ":65535" is longest possible port value
{
int index = base_index - i;
if ( index < 3 )
return NETCODE_ERROR;
if ( address_string[index] == ':' )
{
address->port = (uint16_t) ( atoi( &address_string[index + 1] ) );
address_string[index-1] = '\0';
}
}
address_string += 1;
}
struct in6_addr sockaddr6;
if ( inet_pton( AF_INET6, address_string, &sockaddr6 ) == 1 )
{
address->type = NETCODE_ADDRESS_IPV6;
int i;
for ( i = 0; i < 8; i++ )
{
address->data.ipv6[i] = ntohs( ( (uint16_t*) &sockaddr6 ) [i] );
}
return NETCODE_OK;
}
// otherwise it's probably an IPv4 address:
// 1. look for ":portnum", if found save the portnum and strip it out
// 2. parse remaining ipv4 address via inet_pton
address_string_length = (int) strlen( address_string );
int base_index = address_string_length - 1;
int i;
for ( i = 0; i < 6; i++ )
{
int index = base_index - i;
if ( index < 0 )
break;
if ( address_string[index] == ':' )
{
address->port = (uint16_t) atoi( &address_string[index+1] );
address_string[index] = '\0';
}
}
struct sockaddr_in sockaddr4;
if ( inet_pton( AF_INET, address_string, &sockaddr4.sin_addr ) == 1 )
{
address->type = NETCODE_ADDRESS_IPV4;
address->data.ipv4[3] = (uint8_t) ( ( sockaddr4.sin_addr.s_addr & 0xFF000000 ) >> 24 );
address->data.ipv4[2] = (uint8_t) ( ( sockaddr4.sin_addr.s_addr & 0x00FF0000 ) >> 16 );
address->data.ipv4[1] = (uint8_t) ( ( sockaddr4.sin_addr.s_addr & 0x0000FF00 ) >> 8 );
address->data.ipv4[0] = (uint8_t) ( ( sockaddr4.sin_addr.s_addr & 0x000000FF ) );
return NETCODE_OK;
}
return NETCODE_ERROR;
}
char * netcode_address_to_string( struct netcode_address_t * address, char * buffer )
{
netcode_assert( address );
netcode_assert( buffer );
if ( address->type == NETCODE_ADDRESS_IPV6 )
{
if ( address->port == 0 )
{
uint16_t ipv6_network_order[8];
int i;
for ( i = 0; i < 8; i++ )
ipv6_network_order[i] = htons( address->data.ipv6[i] );
inet_ntop( AF_INET6, (void*) ipv6_network_order, buffer, NETCODE_MAX_ADDRESS_STRING_LENGTH );
return buffer;
}
else
{
char address_string[INET6_ADDRSTRLEN];
uint16_t ipv6_network_order[8];
int i;
for ( i = 0; i < 8; i++ )
ipv6_network_order[i] = htons( address->data.ipv6[i] );
inet_ntop( AF_INET6, (void*) ipv6_network_order, address_string, INET6_ADDRSTRLEN );
snprintf( buffer, NETCODE_MAX_ADDRESS_STRING_LENGTH, "[%s]:%d", address_string, address->port );
return buffer;
}
}
else if ( address->type == NETCODE_ADDRESS_IPV4 )
{
if ( address->port != 0 )
{
snprintf( buffer, NETCODE_MAX_ADDRESS_STRING_LENGTH, "%d.%d.%d.%d:%d",
address->data.ipv4[0],
address->data.ipv4[1],
address->data.ipv4[2],
address->data.ipv4[3],
address->port );
}
else
{
snprintf( buffer, NETCODE_MAX_ADDRESS_STRING_LENGTH, "%d.%d.%d.%d",
address->data.ipv4[0],
address->data.ipv4[1],
address->data.ipv4[2],
address->data.ipv4[3] );
}
return buffer;
}
else
{
snprintf( buffer, NETCODE_MAX_ADDRESS_STRING_LENGTH, "%s", "NONE" );
return buffer;
}
}
int netcode_address_equal( struct netcode_address_t * a, struct netcode_address_t * b )
{
netcode_assert( a );
netcode_assert( b );
if ( a->type != b->type )
return 0;
if ( a->port != b->port )
return 0;
if ( a->type == NETCODE_ADDRESS_IPV4 )
{
int i;
for ( i = 0; i < 4; i++ )
{
if ( a->data.ipv4[i] != b->data.ipv4[i] )
return 0;
}
}
else if ( a->type == NETCODE_ADDRESS_IPV6 )
{
int i;
for ( i = 0; i < 8; i++ )
{
if ( a->data.ipv6[i] != b->data.ipv6[i] )
return 0;
}
}
else
{
return 0;
}
return 1;
}
// ----------------------------------------------------------------
struct netcode_t
{
int initialized;
};
static struct netcode_t netcode;
int netcode_init()
{
netcode_assert( !netcode.initialized );
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
WSADATA WsaData;
if ( WSAStartup( MAKEWORD(2,2), &WsaData ) != NO_ERROR )
return NETCODE_ERROR;
#endif // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
if ( sodium_init() == -1 )
return NETCODE_ERROR;
netcode.initialized = 1;
return NETCODE_OK;
}
void netcode_term()
{
netcode_assert( netcode.initialized );
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
WSACleanup();
#endif // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
netcode.initialized = 0;
}
// ----------------------------------------------------------------
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
typedef uint32_t netcode_socket_handle_t;
#else // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
typedef size_t netcode_socket_handle_t;
#endif // #if NETCODE_PLATFORM == NETCODe_PLATFORM_WINDOWS
struct netcode_socket_t
{
struct netcode_address_t address;
netcode_socket_handle_t handle;
};
struct netcode_socket_holder_t
{
struct netcode_socket_t ipv4;
struct netcode_socket_t ipv6;
};
#define NETCODE_SOCKET_ERROR_NONE 0
#define NETCODE_SOCKET_ERROR_CREATE_FAILED 1
#define NETCODE_SOCKET_ERROR_SET_NON_BLOCKING_FAILED 2
#define NETCODE_SOCKET_ERROR_SOCKOPT_IPV6_ONLY_FAILED 3
#define NETCODE_SOCKET_ERROR_SOCKOPT_RCVBUF_FAILED 4
#define NETCODE_SOCKET_ERROR_SOCKOPT_SNDBUF_FAILED 5
#define NETCODE_SOCKET_ERROR_BIND_IPV4_FAILED 6
#define NETCODE_SOCKET_ERROR_BIND_IPV6_FAILED 7
#define NETCODE_SOCKET_ERROR_GET_SOCKNAME_IPV4_FAILED 8
#define NETCODE_SOCKET_ERROR_GET_SOCKNAME_IPV6_FAILED 7
void netcode_socket_destroy( struct netcode_socket_t * socket )
{
netcode_assert( socket );
netcode_assert( netcode.initialized );
if ( socket->handle != 0 )
{
#if NETCODE_PLATFORM == NETCODE_PLATFORM_MAC || NETCODE_PLATFORM == NETCODE_PLATFORM_UNIX
close( socket->handle );
#elif NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
closesocket( socket->handle );
#else
#error unsupported platform
#endif
socket->handle = 0;
}
}
int netcode_socket_create( struct netcode_socket_t * s, struct netcode_address_t * address, int send_buffer_size, int receive_buffer_size )
{
netcode_assert( s );
netcode_assert( address );
netcode_assert( netcode.initialized );
netcode_assert( address->type != NETCODE_ADDRESS_NONE );
s->address = *address;
// create socket
s->handle = socket( ( address->type == NETCODE_ADDRESS_IPV6 ) ? AF_INET6 : AF_INET, SOCK_DGRAM, IPPROTO_UDP );
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
if ( s->handle == (uint32_t)INVALID_SOCKET )
#else // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
if ( s->handle <= 0 )
#endif // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to create socket\n" );
return NETCODE_SOCKET_ERROR_CREATE_FAILED;
}
// IMPORTANT: tell windows we don't want to receive any connection reset messages
// for this socket, otherwise recvfrom errors out when client sockets disconnect hard
// in response to ICMP messages.
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
#define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR, 12)
BOOL bNewBehavior = FALSE;
DWORD dwBytesReturned = 0;
WSAIoctl( s->handle, SIO_UDP_CONNRESET, &bNewBehavior, sizeof(bNewBehavior), NULL, 0, &dwBytesReturned, NULL, NULL );
#endif
// force IPv6 only if necessary
if ( address->type == NETCODE_ADDRESS_IPV6 )
{
int yes = 1;
if ( setsockopt( s->handle, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&yes, sizeof(yes) ) != 0 )
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to set socket ipv6 only\n" );
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_SOCKOPT_IPV6_ONLY_FAILED;
}
}
// increase socket send and receive buffer sizes
if ( setsockopt( s->handle, SOL_SOCKET, SO_SNDBUF, (char*)&send_buffer_size, sizeof(int) ) != 0 )
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to set socket send buffer size\n" );
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_SOCKOPT_SNDBUF_FAILED;
}
if ( setsockopt( s->handle, SOL_SOCKET, SO_RCVBUF, (char*)&receive_buffer_size, sizeof(int) ) != 0 )
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to set socket receive buffer size\n" );
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_SOCKOPT_RCVBUF_FAILED;
}
// bind to port
if ( address->type == NETCODE_ADDRESS_IPV6 )
{
struct sockaddr_in6 socket_address;
memset( &socket_address, 0, sizeof( struct sockaddr_in6 ) );
socket_address.sin6_family = AF_INET6;
int i;
for ( i = 0; i < 8; i++ )
{
( (uint16_t*) &socket_address.sin6_addr ) [i] = htons( address->data.ipv6[i] );
}
socket_address.sin6_port = htons( address->port );
if ( bind( s->handle, (struct sockaddr*) &socket_address, sizeof( socket_address ) ) < 0 )
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to bind socket (ipv6)\n" );
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_BIND_IPV6_FAILED;
}
}
else
{
struct sockaddr_in socket_address;
memset( &socket_address, 0, sizeof( socket_address ) );
socket_address.sin_family = AF_INET;
socket_address.sin_addr.s_addr = ( ( (uint32_t) address->data.ipv4[0] ) ) |
( ( (uint32_t) address->data.ipv4[1] ) << 8 ) |
( ( (uint32_t) address->data.ipv4[2] ) << 16 ) |
( ( (uint32_t) address->data.ipv4[3] ) << 24 );
socket_address.sin_port = htons( address->port );
if ( bind( s->handle, (struct sockaddr*) &socket_address, sizeof( socket_address ) ) < 0 )
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to bind socket (ipv4)\n" );
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_BIND_IPV4_FAILED;
}
}
// if bound to port 0 find the actual port we got
if ( address->port == 0 )
{
if ( address->type == NETCODE_ADDRESS_IPV6 )
{
struct sockaddr_in6 sin;
socklen_t len = sizeof( sin );
if ( getsockname( s->handle, (struct sockaddr*)&sin, &len ) == -1 )
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to get socket port (ipv6)\n" );
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_GET_SOCKNAME_IPV6_FAILED;
}
s->address.port = ntohs( sin.sin6_port );
}
else
{
struct sockaddr_in sin;
socklen_t len = sizeof( sin );
if ( getsockname( s->handle, (struct sockaddr*)&sin, &len ) == -1 )
{
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: failed to get socket port (ipv4)\n" );
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_GET_SOCKNAME_IPV4_FAILED;
}
s->address.port = ntohs( sin.sin_port );
}
}
// set non-blocking io
#if NETCODE_PLATFORM == NETCODE_PLATFORM_MAC || NETCODE_PLATFORM == NETCODE_PLATFORM_UNIX
int non_blocking = 1;
if ( fcntl( s->handle, F_SETFL, O_NONBLOCK, non_blocking ) == -1 )
{
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_SET_NON_BLOCKING_FAILED;
}
#elif NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
DWORD nonBlocking = 1;
if ( ioctlsocket( s->handle, FIONBIO, &nonBlocking ) != 0 )
{
netcode_socket_destroy( s );
return NETCODE_SOCKET_ERROR_SET_NON_BLOCKING_FAILED;
}
#else
#error unsupported platform
#endif
return NETCODE_SOCKET_ERROR_NONE;
}
void netcode_socket_send_packet( struct netcode_socket_t * socket, struct netcode_address_t * to, void * packet_data, int packet_bytes )
{
netcode_assert( socket );
netcode_assert( socket->handle != 0 );
netcode_assert( to );
netcode_assert( to->type == NETCODE_ADDRESS_IPV6 || to->type == NETCODE_ADDRESS_IPV4 );
netcode_assert( packet_data );
netcode_assert( packet_bytes > 0 );
if ( to->type == NETCODE_ADDRESS_IPV6 )
{
struct sockaddr_in6 socket_address;
memset( &socket_address, 0, sizeof( socket_address ) );
socket_address.sin6_family = AF_INET6;
int i;
for ( i = 0; i < 8; i++ )
{
( (uint16_t*) &socket_address.sin6_addr ) [i] = htons( to->data.ipv6[i] );
}
socket_address.sin6_port = htons( to->port );
int result = sendto( socket->handle, (char*) packet_data, packet_bytes, 0, (struct sockaddr*) &socket_address, sizeof( struct sockaddr_in6 ) );
(void) result;
}
else if ( to->type == NETCODE_ADDRESS_IPV4 )
{
struct sockaddr_in socket_address;
memset( &socket_address, 0, sizeof( socket_address ) );
socket_address.sin_family = AF_INET;
socket_address.sin_addr.s_addr = ( ( (uint32_t) to->data.ipv4[0] ) ) |
( ( (uint32_t) to->data.ipv4[1] ) << 8 ) |
( ( (uint32_t) to->data.ipv4[2] ) << 16 ) |
( ( (uint32_t) to->data.ipv4[3] ) << 24 );
socket_address.sin_port = htons( to->port );
int result = sendto( socket->handle, (NETCODE_CONST char*) packet_data, packet_bytes, 0, (struct sockaddr*) &socket_address, sizeof( struct sockaddr_in ) );
(void) result;
}
}
int netcode_socket_receive_packet( struct netcode_socket_t * socket, struct netcode_address_t * from, void * packet_data, int max_packet_size )
{
netcode_assert( socket );
netcode_assert( socket->handle != 0 );
netcode_assert( from );
netcode_assert( packet_data );
netcode_assert( max_packet_size > 0 );
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
typedef int socklen_t;
#endif // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
struct sockaddr_storage sockaddr_from;
socklen_t from_length = sizeof( sockaddr_from );
int result = recvfrom( socket->handle, (char*) packet_data, max_packet_size, 0, (struct sockaddr*) &sockaddr_from, &from_length );
#if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
if ( result == SOCKET_ERROR )
{
int error = WSAGetLastError();
if ( error == WSAEWOULDBLOCK )
return 0;
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: recvfrom failed with error %d\n", error );
return 0;
}
#else // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
if ( result <= 0 )
{
if ( errno == EAGAIN )
return 0;
netcode_printf( NETCODE_LOG_LEVEL_ERROR, "error: recvfrom failed with error %d\n", errno );
return 0;
}
#endif // #if NETCODE_PLATFORM == NETCODE_PLATFORM_WINDOWS
if ( sockaddr_from.ss_family == AF_INET6 )
{
struct sockaddr_in6 * addr_ipv6 = (struct sockaddr_in6*) &sockaddr_from;
from->type = NETCODE_ADDRESS_IPV6;
int i;
for ( i = 0; i < 8; i++ )
{
from->data.ipv6[i] = ntohs( ( (uint16_t*) &addr_ipv6->sin6_addr ) [i] );
}
from->port = ntohs( addr_ipv6->sin6_port );
}
else if ( sockaddr_from.ss_family == AF_INET )
{
struct sockaddr_in * addr_ipv4 = (struct sockaddr_in*) &sockaddr_from;
from->type = NETCODE_ADDRESS_IPV4;
from->data.ipv4[0] = (uint8_t) ( ( addr_ipv4->sin_addr.s_addr & 0x000000FF ) );
from->data.ipv4[1] = (uint8_t) ( ( addr_ipv4->sin_addr.s_addr & 0x0000FF00 ) >> 8 );
from->data.ipv4[2] = (uint8_t) ( ( addr_ipv4->sin_addr.s_addr & 0x00FF0000 ) >> 16 );
from->data.ipv4[3] = (uint8_t) ( ( addr_ipv4->sin_addr.s_addr & 0xFF000000 ) >> 24 );
from->port = ntohs( addr_ipv4->sin_port );
}
else
{
netcode_assert( 0 );
return 0;
}
netcode_assert( result >= 0 );
int bytes_read = result;
return bytes_read;
}
// ----------------------------------------------------------------
void netcode_write_uint8( uint8_t ** p, uint8_t value )
{
**p = value;
++(*p);
}
void netcode_write_uint16( uint8_t ** p, uint16_t value )
{
(*p)[0] = value & 0xFF;
(*p)[1] = value >> 8;
*p += 2;
}
void netcode_write_uint32( uint8_t ** p, uint32_t value )
{
(*p)[0] = value & 0xFF;
(*p)[1] = ( value >> 8 ) & 0xFF;
(*p)[2] = ( value >> 16 ) & 0xFF;
(*p)[3] = value >> 24;
*p += 4;
}
void netcode_write_uint64( uint8_t ** p, uint64_t value )
{
(*p)[0] = value & 0xFF;
(*p)[1] = ( value >> 8 ) & 0xFF;
(*p)[2] = ( value >> 16 ) & 0xFF;
(*p)[3] = ( value >> 24 ) & 0xFF;
(*p)[4] = ( value >> 32 ) & 0xFF;
(*p)[5] = ( value >> 40 ) & 0xFF;
(*p)[6] = ( value >> 48 ) & 0xFF;
(*p)[7] = value >> 56;
*p += 8;
}
void netcode_write_bytes( uint8_t ** p, uint8_t * byte_array, int num_bytes )
{
int i;
for ( i = 0; i < num_bytes; i++ )
{
netcode_write_uint8( p, byte_array[i] );
}
}
uint8_t netcode_read_uint8( uint8_t ** p )
{
uint8_t value = **p;
++(*p);
return value;
}
uint16_t netcode_read_uint16( uint8_t ** p )
{
uint16_t value;
value = (*p)[0];
value |= ( ( (uint16_t)( (*p)[1] ) ) << 8 );
*p += 2;
return value;
}
uint32_t netcode_read_uint32( uint8_t ** p )
{
uint32_t value;
value = (*p)[0];
value |= ( ( (uint32_t)( (*p)[1] ) ) << 8 );
value |= ( ( (uint32_t)( (*p)[2] ) ) << 16 );
value |= ( ( (uint32_t)( (*p)[3] ) ) << 24 );
*p += 4;
return value;
}
uint64_t netcode_read_uint64( uint8_t ** p )
{
uint64_t value;
value = (*p)[0];
value |= ( ( (uint64_t)( (*p)[1] ) ) << 8 );
value |= ( ( (uint64_t)( (*p)[2] ) ) << 16 );
value |= ( ( (uint64_t)( (*p)[3] ) ) << 24 );
value |= ( ( (uint64_t)( (*p)[4] ) ) << 32 );
value |= ( ( (uint64_t)( (*p)[5] ) ) << 40 );
value |= ( ( (uint64_t)( (*p)[6] ) ) << 48 );
value |= ( ( (uint64_t)( (*p)[7] ) ) << 56 );
*p += 8;
return value;
}
void netcode_read_bytes( uint8_t ** p, uint8_t * byte_array, int num_bytes )
{
int i;
for ( i = 0; i < num_bytes; i++ )
{
byte_array[i] = netcode_read_uint8( p );
}
}
// ----------------------------------------------------------------
void netcode_generate_key( uint8_t * key )
{
netcode_assert( key );
randombytes_buf( key, NETCODE_KEY_BYTES );
}
void netcode_generate_nonce( uint8_t * nonce )
{
netcode_assert( nonce );
randombytes_buf( nonce, NETCODE_CONNECT_TOKEN_NONCE_BYTES );
}
void netcode_random_bytes( uint8_t * data, int bytes )
{
netcode_assert( data );
netcode_assert( bytes > 0 );
randombytes_buf( data, bytes );
}
int netcode_encrypt_aead_bignonce( uint8_t * message, uint64_t message_length,
uint8_t * additional, uint64_t additional_length,
NETCODE_CONST uint8_t * nonce,
NETCODE_CONST uint8_t * key )
{
unsigned long long encrypted_length;
int result = crypto_aead_xchacha20poly1305_ietf_encrypt( message, &encrypted_length,
message, (unsigned long long) message_length,
additional, (unsigned long long) additional_length,
NULL, nonce, key );
if ( result != 0 )
return NETCODE_ERROR;
netcode_assert( encrypted_length == message_length + NETCODE_MAC_BYTES );
return NETCODE_OK;
}
int netcode_decrypt_aead_bignonce( uint8_t * message, uint64_t message_length,
uint8_t * additional, uint64_t additional_length,
uint8_t * nonce,
uint8_t * key )
{
unsigned long long decrypted_length;
int result = crypto_aead_xchacha20poly1305_ietf_decrypt( message, &decrypted_length,
NULL,
message, (unsigned long long) message_length,
additional, (unsigned long long) additional_length,
nonce, key );
if ( result != 0 )
return NETCODE_ERROR;
netcode_assert( decrypted_length == message_length - NETCODE_MAC_BYTES );
return NETCODE_OK;
}
int netcode_encrypt_aead( uint8_t * message, uint64_t message_length,
uint8_t * additional, uint64_t additional_length,
NETCODE_CONST uint8_t * nonce,
NETCODE_CONST uint8_t * key )
{
unsigned long long encrypted_length;
int result = crypto_aead_chacha20poly1305_ietf_encrypt( message, &encrypted_length,
message, (unsigned long long) message_length,
additional, (unsigned long long) additional_length,
NULL, nonce, key );
if ( result != 0 )
return NETCODE_ERROR;
netcode_assert( encrypted_length == message_length + NETCODE_MAC_BYTES );
return NETCODE_OK;
}
int netcode_decrypt_aead( uint8_t * message, uint64_t message_length,
uint8_t * additional, uint64_t additional_length,
uint8_t * nonce,
uint8_t * key )
{
unsigned long long decrypted_length;
int result = crypto_aead_chacha20poly1305_ietf_decrypt( message, &decrypted_length,
NULL,
message, (unsigned long long) message_length,
additional, (unsigned long long) additional_length,
nonce, key );
if ( result != 0 )
return NETCODE_ERROR;
netcode_assert( decrypted_length == message_length - NETCODE_MAC_BYTES );
return NETCODE_OK;
}
// ----------------------------------------------------------------
struct netcode_connect_token_private_t
{
uint64_t client_id;
int timeout_seconds;
int num_server_addresses;
struct netcode_address_t server_addresses[NETCODE_MAX_SERVERS_PER_CONNECT];
uint8_t client_to_server_key[NETCODE_KEY_BYTES];
uint8_t server_to_client_key[NETCODE_KEY_BYTES];
uint8_t user_data[NETCODE_USER_DATA_BYTES];
};
void netcode_generate_connect_token_private( struct netcode_connect_token_private_t * connect_token,
uint64_t client_id,
int timeout_seconds,
int num_server_addresses,
struct netcode_address_t * server_addresses,
uint8_t * user_data )
{
netcode_assert( connect_token );
netcode_assert( num_server_addresses > 0 );
netcode_assert( num_server_addresses <= NETCODE_MAX_SERVERS_PER_CONNECT );
netcode_assert( server_addresses );
netcode_assert( user_data );
connect_token->client_id = client_id;
connect_token->timeout_seconds = timeout_seconds;
connect_token->num_server_addresses = num_server_addresses;
int i;
for ( i = 0; i < num_server_addresses; i++ )
{
memcpy( &connect_token->server_addresses[i], &server_addresses[i], sizeof( struct netcode_address_t ) );
}
netcode_generate_key( connect_token->client_to_server_key );
netcode_generate_key( connect_token->server_to_client_key );
if ( user_data != NULL )
{
memcpy( connect_token->user_data, user_data, NETCODE_USER_DATA_BYTES );
}
else
{
memset( connect_token->user_data, 0, NETCODE_USER_DATA_BYTES );
}
}
void netcode_write_connect_token_private( struct netcode_connect_token_private_t * connect_token, uint8_t * buffer, int buffer_length )
{
(void) buffer_length;
netcode_assert( connect_token );
netcode_assert( connect_token->num_server_addresses > 0 );
netcode_assert( connect_token->num_server_addresses <= NETCODE_MAX_SERVERS_PER_CONNECT );
netcode_assert( buffer );
netcode_assert( buffer_length >= NETCODE_CONNECT_TOKEN_PRIVATE_BYTES );
uint8_t * start = buffer;
(void) start;
netcode_write_uint64( &buffer, connect_token->client_id );
netcode_write_uint32( &buffer, connect_token->timeout_seconds );
netcode_write_uint32( &buffer, connect_token->num_server_addresses );
int i,j;
for ( i = 0; i < connect_token->num_server_addresses; i++ )
{
if ( connect_token->server_addresses[i].type == NETCODE_ADDRESS_IPV4 )
{
netcode_write_uint8( &buffer, NETCODE_ADDRESS_IPV4 );
for ( j = 0; j < 4; j++ )
{