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xash3d-fwgs/engine/common/net_ws.c

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/*
net_ws.c - win network interface
Copyright (C) 2007 Uncle Mike
This program 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.
This program 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.
*/
#ifdef _WIN32
// Winsock
#include <winsock.h>
#include <wsipx.h>
#define socklen_t int //#include <ws2tcpip.h>
#else
// BSD sockets
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
// Errors handling
#include <errno.h>
#include <fcntl.h>
#endif
#include "common.h"
#include "netchan.h"
#include "mathlib.h"
// #define NET_USE_FRAGMENTS
#define PORT_ANY -1
#define MAX_LOOPBACK 4
#define MASK_LOOPBACK (MAX_LOOPBACK - 1)
#define MAX_ROUTEABLE_PACKET 1400
#define SPLIT_SIZE ( MAX_ROUTEABLE_PACKET - sizeof( SPLITPACKET ))
#define NET_MAX_FRAGMENTS ( NET_MAX_FRAGMENT / SPLIT_SIZE )
#ifndef _WIN32 // it seems we need to use WS2 to support it
#define HAVE_GETADDRINFO
#endif
#ifdef _WIN32
// wsock32.dll exports
static int (_stdcall *pWSACleanup)( void );
static word (_stdcall *pNtohs)( word netshort );
static int (_stdcall *pWSAGetLastError)( void );
static int (_stdcall *pCloseSocket)( SOCKET s );
static word (_stdcall *pHtons)( word hostshort );
static dword (_stdcall *pInet_Addr)( const char* cp );
static char* (_stdcall *pInet_Ntoa)( struct in_addr in );
static SOCKET (_stdcall *pSocket)( int af, int type, int protocol );
static struct hostent *(_stdcall *pGetHostByName)( const char* name );
static int (_stdcall *pIoctlSocket)( SOCKET s, long cmd, dword* argp );
static int (_stdcall *pWSAStartup)( word wVersionRequired, LPWSADATA lpWSAData );
static int (_stdcall *pBind)( SOCKET s, const struct sockaddr* addr, int namelen );
static int (_stdcall *pSetSockopt)( SOCKET s, int level, int optname, const char* optval, int optlen );
static int (_stdcall *pRecvFrom)( SOCKET s, char* buf, int len, int flags, struct sockaddr* from, int* fromlen );
static int (_stdcall *pSendTo)( SOCKET s, const char* buf, int len, int flags, const struct sockaddr* to, int tolen );
static int (_stdcall *pSelect)( int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, const struct timeval* timeout );
static int (_stdcall *pConnect)( SOCKET s, const struct sockaddr *name, int namelen );
static int (_stdcall *pGetSockName)( SOCKET s, struct sockaddr *name, int *namelen );
static int (_stdcall *pSend)( SOCKET s, const char *buf, int len, int flags );
static int (_stdcall *pRecv)( SOCKET s, char *buf, int len, int flags );
static int (_stdcall *pGetHostName)( char *name, int namelen );
static dword (_stdcall *pNtohl)( dword netlong );
static dllfunc_t winsock_funcs[] =
{
{ "bind", (void **) &pBind },
{ "send", (void **) &pSend },
{ "recv", (void **) &pRecv },
{ "ntohs", (void **) &pNtohs },
{ "htons", (void **) &pHtons },
{ "ntohl", (void **) &pNtohl },
{ "socket", (void **) &pSocket },
{ "select", (void **) &pSelect },
{ "sendto", (void **) &pSendTo },
{ "connect", (void **) &pConnect },
{ "recvfrom", (void **) &pRecvFrom },
{ "inet_addr", (void **) &pInet_Addr },
{ "inet_ntoa", (void **) &pInet_Ntoa },
{ "WSAStartup", (void **) &pWSAStartup },
{ "WSACleanup", (void **) &pWSACleanup },
{ "setsockopt", (void **) &pSetSockopt },
{ "ioctlsocket", (void **) &pIoctlSocket },
{ "closesocket", (void **) &pCloseSocket },
{ "gethostname", (void **) &pGetHostName },
{ "getsockname", (void **) &pGetSockName },
{ "gethostbyname", (void **) &pGetHostByName },
{ "WSAGetLastError", (void **) &pWSAGetLastError },
{ NULL, NULL }
};
dll_info_t winsock_dll = { "wsock32.dll", winsock_funcs, false };
static void (_stdcall *pInitializeCriticalSection)( void* );
static void (_stdcall *pEnterCriticalSection)( void* );
static void (_stdcall *pLeaveCriticalSection)( void* );
static void (_stdcall *pDeleteCriticalSection)( void* );
static dllfunc_t kernel32_funcs[] =
{
{ "InitializeCriticalSection", (void **) &pInitializeCriticalSection },
{ "EnterCriticalSection", (void **) &pEnterCriticalSection },
{ "LeaveCriticalSection", (void **) &pLeaveCriticalSection },
{ "DeleteCriticalSection", (void **) &pDeleteCriticalSection },
{ NULL, NULL }
};
dll_info_t kernel32_dll = { "kernel32.dll", kernel32_funcs, false };
static void NET_InitializeCriticalSections( void );
qboolean NET_OpenWinSock( void )
{
if( Sys_LoadLibrary( &kernel32_dll ) )
NET_InitializeCriticalSections();
// initialize the Winsock function vectors (we do this instead of statically linking
// so we can run on Win 3.1, where there isn't necessarily Winsock)
return Sys_LoadLibrary( &winsock_dll );
}
void NET_FreeWinSock( void )
{
Sys_FreeLibrary( &winsock_dll );
}
#else // _WIN32
#define pHtons htons
#define pConnect connect
#define pInet_Addr inet_addr
#define pRecvFrom recvfrom
#define pSendTo sendto
#define pSocket socket
#define pIoctlSocket ioctl
#define pCloseSocket close
#define pSetSockopt setsockopt
#define pBind bind
#define pGetHostName gethostname
#define pGetSockName getsockname
#define pGetHs
#define pRecv recv
#define pSend send
#define pInet_Ntoa inet_ntoa
#define pNtohs ntohs
#define pGetHostByName gethostbyname
#define pSelect select
#define pGetAddrInfo getaddrinfo
#define pWSAGetLastError() errno
#define SOCKET int
#define INVALID_SOCKET -1
#define WSAEINTR EINTR
#define WSAEBADF EBADF
#define WSAEACCES EACCES
#define WSAEFAULT EFAULT
#define WSAEINVAL EINVAL
#define WSAEMFILE EMFILE
#define WSAEWOULDBLOCK EWOULDBLOCK
#define WSAEINPROGRESS EINPROGRESS
#define WSAEALREADY EALREADY
#define WSAENOTSOCK ENOTSOCK
#define WSAEDESTADDRREQ EDESTADDRREQ
#define WSAEMSGSIZE EMSGSIZE
#define WSAEPROTOTYPE EPROTOTYPE
#define WSAENOPROTOOPT ENOPROTOOPT
#define WSAEPROTONOSUPPORT EPROTONOSUPPORT
#define WSAESOCKTNOSUPPORT ESOCKTNOSUPPORT
#define WSAEOPNOTSUPP EOPNOTSUPP
#define WSAEPFNOSUPPORT EPFNOSUPPORT
#define WSAEAFNOSUPPORT EAFNOSUPPORT
#define WSAEADDRINUSE EADDRINUSE
#define WSAEADDRNOTAVAIL EADDRNOTAVAIL
#define WSAENETDOWN ENETDOWN
#define WSAENETUNREACH ENETUNREACH
#define WSAENETRESET ENETRESET
#define WSAECONNABORTED ECONNABORTED
#define WSAECONNRESET ECONNRESET
#define WSAENOBUFS ENOBUFS
#define WSAEISCONN EISCONN
#define WSAENOTCONN ENOTCONN
#define WSAESHUTDOWN ESHUTDOWN
#define WSAETOOMANYREFS ETOOMANYREFS
#define WSAETIMEDOUT ETIMEDOUT
#define WSAECONNREFUSED ECONNREFUSED
#define WSAELOOP ELOOP
#define WSAENAMETOOLONG ENAMETOOLONG
#define WSAEHOSTDOWN EHOSTDOWN
#ifdef __EMSCRIPTEN__
/* All socket operations are non-blocking already */
static int ioctl_stub( int d, unsigned long r, ...)
{
return 0;
}
#undef pIoctlSocket
#define pIoctlSocket ioctl_stub
#endif // __EMSCRIPTEN__
#endif // !_WIN32
typedef struct
{
byte data[NET_MAX_MESSAGE];
int datalen;
} net_loopmsg_t;
typedef struct
{
net_loopmsg_t msgs[MAX_LOOPBACK];
int get, send;
} net_loopback_t;
typedef struct packetlag_s
{
byte *data; // Raw stream data is stored.
int size;
netadr_t from;
float receivedtime;
struct packetlag_s *next;
struct packetlag_s *prev;
} packetlag_t;
// split long packets. Anything over 1460 is failing on some routers.
typedef struct
{
int current_sequence;
int split_count;
int total_size;
char buffer[NET_MAX_FRAGMENT];
} LONGPACKET;
// use this to pick apart the network stream, must be packed
#pragma pack(push, 1)
typedef struct
{
int net_id;
int sequence_number;
short packet_id;
} SPLITPACKET;
#pragma pack(pop)
typedef struct
{
net_loopback_t loopbacks[NS_COUNT];
packetlag_t lagdata[NS_COUNT];
int losscount[NS_COUNT];
float fakelag; // cached fakelag value
LONGPACKET split;
int split_flags[NET_MAX_FRAGMENTS];
long sequence_number;
int ip_sockets[NS_COUNT];
qboolean initialized;
qboolean threads_initialized;
qboolean configured;
qboolean allow_ip;
#ifdef _WIN32
WSADATA winsockdata;
#endif
} net_state_t;
static net_state_t net;
static convar_t *net_ipname;
static convar_t *net_hostport;
static convar_t *net_iphostport;
static convar_t *net_clientport;
static convar_t *net_ipclientport;
static convar_t *net_fakelag;
static convar_t *net_fakeloss;
static convar_t *net_address;
convar_t *net_clockwindow;
netadr_t net_local;
/*
====================
NET_ErrorString
====================
*/
char *NET_ErrorString( void )
{
#ifdef _WIN32
int err = WSANOTINITIALISED;
if( net.initialized )
err = pWSAGetLastError();
switch( err )
{
case WSAEINTR: return "WSAEINTR";
case WSAEBADF: return "WSAEBADF";
case WSAEACCES: return "WSAEACCES";
case WSAEFAULT: return "WSAEFAULT";
case WSAEINVAL: return "WSAEINVAL";
case WSAEMFILE: return "WSAEMFILE";
case WSAEWOULDBLOCK: return "WSAEWOULDBLOCK";
case WSAEINPROGRESS: return "WSAEINPROGRESS";
case WSAEALREADY: return "WSAEALREADY";
case WSAENOTSOCK: return "WSAENOTSOCK";
case WSAEDESTADDRREQ: return "WSAEDESTADDRREQ";
case WSAEMSGSIZE: return "WSAEMSGSIZE";
case WSAEPROTOTYPE: return "WSAEPROTOTYPE";
case WSAENOPROTOOPT: return "WSAENOPROTOOPT";
case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
case WSAEOPNOTSUPP: return "WSAEOPNOTSUPP";
case WSAEPFNOSUPPORT: return "WSAEPFNOSUPPORT";
case WSAEAFNOSUPPORT: return "WSAEAFNOSUPPORT";
case WSAEADDRINUSE: return "WSAEADDRINUSE";
case WSAEADDRNOTAVAIL: return "WSAEADDRNOTAVAIL";
case WSAENETDOWN: return "WSAENETDOWN";
case WSAENETUNREACH: return "WSAENETUNREACH";
case WSAENETRESET: return "WSAENETRESET";
case WSAECONNABORTED: return "WSWSAECONNABORTEDAEINTR";
case WSAECONNRESET: return "WSAECONNRESET";
case WSAENOBUFS: return "WSAENOBUFS";
case WSAEISCONN: return "WSAEISCONN";
case WSAENOTCONN: return "WSAENOTCONN";
case WSAESHUTDOWN: return "WSAESHUTDOWN";
case WSAETOOMANYREFS: return "WSAETOOMANYREFS";
case WSAETIMEDOUT: return "WSAETIMEDOUT";
case WSAECONNREFUSED: return "WSAECONNREFUSED";
case WSAELOOP: return "WSAELOOP";
case WSAENAMETOOLONG: return "WSAENAMETOOLONG";
case WSAEHOSTDOWN: return "WSAEHOSTDOWN";
case WSAEDISCON: return "WSAEDISCON";
case WSASYSNOTREADY: return "WSASYSNOTREADY";
case WSAVERNOTSUPPORTED: return "WSAVERNOTSUPPORTED";
case WSANOTINITIALISED: return "WSANOTINITIALISED";
case WSAHOST_NOT_FOUND: return "WSAHOST_NOT_FOUND";
case WSATRY_AGAIN: return "WSATRY_AGAIN";
case WSANO_RECOVERY: return "WSANO_RECOVERY";
case WSANO_DATA: return "WSANO_DATA";
default: return "NO ERROR";
}
#else
return strerror( errno );
#endif
}
_inline qboolean NET_IsSocketError( int retval )
{
#ifdef _WIN32
return retval == SOCKET_ERROR ? true : false;
#else
return retval < 0 ? true : false;
#endif
}
_inline qboolean NET_IsSocketValid( int socket )
{
#ifdef _WIN32
return socket != INVALID_SOCKET;
#else
return socket >= 0;
#endif
}
/*
====================
NET_NetadrToSockadr
====================
*/
static void NET_NetadrToSockadr( netadr_t *a, struct sockaddr *s )
{
memset( s, 0, sizeof( *s ));
if( a->type == NA_BROADCAST )
{
((struct sockaddr_in *)s)->sin_family = AF_INET;
((struct sockaddr_in *)s)->sin_port = a->port;
((struct sockaddr_in *)s)->sin_addr.s_addr = INADDR_BROADCAST;
}
else if( a->type == NA_IP )
{
((struct sockaddr_in *)s)->sin_family = AF_INET;
((struct sockaddr_in *)s)->sin_addr.s_addr = *(int *)&a->ip;
((struct sockaddr_in *)s)->sin_port = a->port;
}
}
/*
====================
NET_SockadrToNetAdr
====================
*/
static void NET_SockadrToNetadr( struct sockaddr *s, netadr_t *a )
{
if( s->sa_family == AF_INET )
{
a->type = NA_IP;
*(int *)&a->ip = ((struct sockaddr_in *)s)->sin_addr.s_addr;
a->port = ((struct sockaddr_in *)s)->sin_port;
}
}
/*
============
NET_GetHostByName
============
*/
int NET_GetHostByName( const char *hostname )
{
#ifdef HAVE_GETADDRINFO
struct addrinfo *ai = NULL, *cur;
struct addrinfo hints;
int ip;
memset( &hints, 0, sizeof( hints ));
hints.ai_family = AF_INET;
if( !pGetAddrInfo( hostname, NULL, &hints, &ai ))
{
for( cur = ai; cur; cur = cur->ai_next )
{
if( cur->ai_family == AF_INET )
{
ip = *((int*)&((struct sockaddr_in *)cur->ai_addr)->sin_addr);
break;
}
}
if( ai )
freeaddrinfo( ai );
}
return ip;
#else
struct hostent *h;
if(!( h = pGetHostByName( hostname )))
return 0;
return *(int *)h->h_addr_list[0];
#endif
}
#if !defined XASH_NO_ASYNC_NS_RESOLVE && ( defined _WIN32 || !defined __EMSCRIPTEN__ )
#define CAN_ASYNC_NS_RESOLVE
#endif
#ifdef CAN_ASYNC_NS_RESOLVE
static void NET_ResolveThread( void );
#if !defined _WIN32
#include <pthread.h>
#define mutex_lock pthread_mutex_lock
#define mutex_unlock pthread_mutex_unlock
#define exit_thread( x ) pthread_exit(x)
#define create_thread( pfn ) !pthread_create( &nsthread.thread, NULL, (pfn), NULL )
#define detach_thread( x ) pthread_detach(x)
#define mutex_t pthread_mutex_t
#define thread_t pthread_t
void *NET_ThreadStart( void *unused )
{
NET_ResolveThread();
return NULL;
}
#else // WIN32
typedef struct cs
{
void* p1;
int i1, i2;
void *p2, *p3;
uint i4;
} mutex_t;
#define mutex_lock pEnterCriticalSection
#define mutex_unlock pLeaveCriticalSection
#define detach_thread( x ) CloseHandle(x)
#define create_thread( pfn ) nsthread.thread = CreateThread( NULL, 0, pfn, NULL, 0, NULL )
#define mutex_t struct cs
#define thread_t HANDLE
DWORD WINAPI NET_ThreadStart( LPVOID unused )
{
NET_ResolveThread();
ExitThread(0);
return 0;
}
#endif // !_WIN32
#ifdef DEBUG_RESOLVE
#define RESOLVE_DBG(x) Sys_PrintLog(x)
#else
#define RESOLVE_DBG(x)
#endif // DEBUG_RESOLVE
static struct nsthread_s
{
mutex_t mutexns;
mutex_t mutexres;
thread_t thread;
int result;
string hostname;
qboolean busy;
} nsthread
#ifndef _WIN32
= { PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER }
#endif
;
#ifdef _WIN32
static void NET_InitializeCriticalSections( void )
{
net.threads_initialized = true;
pInitializeCriticalSection( &nsthread.mutexns );
pInitializeCriticalSection( &nsthread.mutexres );
}
#endif
void NET_ResolveThread( void )
{
int sin_addr = 0;
RESOLVE_DBG( "[resolve thread] starting resolve for " );
RESOLVE_DBG( nsthread.hostname );
#ifdef HAVE_GETADDRINFO
RESOLVE_DBG( " with getaddrinfo\n" );
#else
RESOLVE_DBG( " with gethostbyname\n" );
#endif
sin_addr = NET_GetHostByName( nsthread.hostname );
if( sin_addr )
RESOLVE_DBG( "[resolve thread] success\n" );
else
RESOLVE_DBG( "[resolve thread] failed\n" );
mutex_lock( &nsthread.mutexres );
nsthread.result = sin_addr;
nsthread.busy = false;
RESOLVE_DBG( "[resolve thread] returning result\n" );
mutex_unlock( &nsthread.mutexres );
RESOLVE_DBG( "[resolve thread] exiting thread\n" );
}
#endif // CAN_ASYNC_NS_RESOLVE
/*
=============
NET_StringToAdr
localhost
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
=============
*/
static int NET_StringToSockaddr( const char *s, struct sockaddr *sadr, qboolean nonblocking )
{
int ip = 0;
char *colon;
char copy[128];
if( !net.initialized )
return false;
memset( sadr, 0, sizeof( *sadr ));
((struct sockaddr_in *)sadr)->sin_family = AF_INET;
((struct sockaddr_in *)sadr)->sin_port = 0;
Q_strncpy( copy, s, sizeof( copy ));
// strip off a trailing :port if present
for( colon = copy; *colon; colon++ )
{
if( *colon == ':' )
{
*colon = 0;
((struct sockaddr_in *)sadr)->sin_port = pHtons((short)Q_atoi( colon + 1 ));
}
}
if( copy[0] >= '0' && copy[0] <= '9' )
{
*(int *)&((struct sockaddr_in *)sadr)->sin_addr = pInet_Addr( copy );
}
else
{
qboolean asyncfailed = true;
#ifdef CAN_ASYNC_NS_RESOLVE
if( net.threads_initialized && !nonblocking )
{
mutex_lock( &nsthread.mutexres );
if( nsthread.busy )
{
mutex_unlock( &nsthread.mutexres );
return 2;
}
if( !Q_strcmp( copy, nsthread.hostname ) )
{
ip = nsthread.result;
nsthread.hostname[0] = 0;
detach_thread( nsthread.thread );
}
else
{
Q_strncpy( nsthread.hostname, copy, MAX_STRING );
nsthread.busy = true;
mutex_unlock( &nsthread.mutexres );
if( create_thread( NET_ThreadStart ) )
{
asyncfailed = false;
return 2;
}
else // failed to create thread
{
Con_Reportf( S_ERROR "NET_StringToSockaddr: failed to create thread!\n");
nsthread.busy = false;
}
}
mutex_unlock( &nsthread.mutexres );
}
#endif // CAN_ASYNC_NS_RESOLVE
if( asyncfailed )
{
ip = NET_GetHostByName( copy );
}
if( !ip )
return 0;
*(int *)&((struct sockaddr_in *)sadr)->sin_addr = ip;
}
return 1;
}
/*
====================
NET_AdrToString
====================
*/
char *NET_AdrToString( const netadr_t a )
{
if( a.type == NA_LOOPBACK )
return "loopback";
return va( "%i.%i.%i.%i:%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3], pNtohs( a.port ));
}
/*
====================
NET_BaseAdrToString
====================
*/
char *NET_BaseAdrToString( const netadr_t a )
{
if( a.type == NA_LOOPBACK )
return "loopback";
return va( "%i.%i.%i.%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3] );
}
/*
===================
NET_CompareBaseAdr
Compares without the port
===================
*/
qboolean NET_CompareBaseAdr( const netadr_t a, const netadr_t b )
{
if( a.type != b.type )
return false;
if( a.type == NA_LOOPBACK )
return true;
if( a.type == NA_IP )
{
if( !memcmp( a.ip, b.ip, 4 ))
return true;
}
return false;
}
/*
====================
NET_CompareClassBAdr
Compare local masks
====================
*/
qboolean NET_CompareClassBAdr( netadr_t a, netadr_t b )
{
if( a.type != b.type )
return false;
if( a.type == NA_LOOPBACK )
return true;
if( a.type == NA_IP )
{
if( a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] )
return true;
}
return false;
}
/*
====================
NET_IsReservedAdr
Check for reserved ip's
====================
*/
qboolean NET_IsReservedAdr( netadr_t a )
{
if( a.type == NA_LOOPBACK )
return true;
if( a.type == NA_IP )
{
if( a.ip[0] == 10 || a.ip[0] == 127 )
return true;
if( a.ip[0] == 172 && a.ip[1] >= 16 )
{
if( a.ip[1] >= 32 )
return false;
return true;
}
if( a.ip[0] == 192 && a.ip[1] >= 168 )
return true;
}
return false;
}
/*
====================
NET_CompareAdr
Compare full address
====================
*/
qboolean NET_CompareAdr( const netadr_t a, const netadr_t b )
{
if( a.type != b.type )
return false;
if( a.type == NA_LOOPBACK )
return true;
if( a.type == NA_IP )
{
if(!memcmp( a.ip, b.ip, 4 ) && a.port == b.port )
return true;
return false;
}
Con_DPrintf( S_ERROR "NET_CompareAdr: bad address type\n" );
return false;
}
/*
====================
NET_IsLocalAddress
====================
*/
qboolean NET_IsLocalAddress( netadr_t adr )
{
return (adr.type == NA_LOOPBACK) ? true : false;
}
/*
=============
NET_StringToAdr
idnewt
192.246.40.70
=============
*/
qboolean NET_StringToAdr( const char *string, netadr_t *adr )
{
struct sockaddr s;
memset( adr, 0, sizeof( netadr_t ));
if( !Q_stricmp( string, "localhost" ) || !Q_stricmp( string, "loopback" ) )
{
adr->type = NA_LOOPBACK;
return true;
}
if( !NET_StringToSockaddr( string, &s, false ))
return false;
NET_SockadrToNetadr( &s, adr );
return true;
}
int NET_StringToAdrNB( const char *string, netadr_t *adr )
{
struct sockaddr s;
int res;
memset( adr, 0, sizeof( netadr_t ));
if( !Q_stricmp( string, "localhost" ) || !Q_stricmp( string, "loopback" ) )
{
adr->type = NA_LOOPBACK;
return true;
}
res = NET_StringToSockaddr( string, &s, true );
if( res == 0 || res == 2 )
return res;
NET_SockadrToNetadr( &s, adr );
return true;
}
/*
=============================================================================
LOOPBACK BUFFERS FOR LOCAL PLAYER
=============================================================================
*/
/*
====================
NET_GetLoopPacket
====================
*/
static qboolean NET_GetLoopPacket( netsrc_t sock, netadr_t *from, byte *data, size_t *length )
{
net_loopback_t *loop;
int i;
if( !data || !length )
return false;
loop = &net.loopbacks[sock];
if( loop->send - loop->get > MAX_LOOPBACK )
loop->get = loop->send - MAX_LOOPBACK;
if( loop->get >= loop->send )
return false;
i = loop->get & MASK_LOOPBACK;
loop->get++;
memcpy( data, loop->msgs[i].data, loop->msgs[i].datalen );
*length = loop->msgs[i].datalen;
memset( from, 0, sizeof( *from ));
from->type = NA_LOOPBACK;
return true;
}
/*
====================
NET_SendLoopPacket
====================
*/
static void NET_SendLoopPacket( netsrc_t sock, size_t length, const void *data, netadr_t to )
{
net_loopback_t *loop;
int i;
loop = &net.loopbacks[sock^1];
i = loop->send & MASK_LOOPBACK;
loop->send++;
memcpy( loop->msgs[i].data, data, length );
loop->msgs[i].datalen = length;
}
/*
====================
NET_ClearLoopback
====================
*/
static void NET_ClearLoopback( void )
{
net.loopbacks[0].send = net.loopbacks[0].get = 0;
net.loopbacks[1].send = net.loopbacks[1].get = 0;
}
/*
=============================================================================
LAG & LOSS SIMULATION SYSTEM (network debugging)
=============================================================================
*/
/*
==================
NET_RemoveFromPacketList
double linked list remove entry
==================
*/
static void NET_RemoveFromPacketList( packetlag_t *p )
{
p->prev->next = p->next;
p->next->prev = p->prev;
p->prev = NULL;
p->next = NULL;
}
/*
==================
NET_ClearLaggedList
double linked list remove queue
==================
*/
static void NET_ClearLaggedList( packetlag_t *list )
{
packetlag_t *p, *n;
p = list->next;
while( p && p != list )
{
n = p->next;
NET_RemoveFromPacketList( p );
if( p->data )
{
Mem_Free( p->data );
p->data = NULL;
}
Mem_Free( p );
p = n;
}
list->prev = list;
list->next = list;
}
/*
==================
NET_AddToLagged
add lagged packet to stream
==================
*/
static void NET_AddToLagged( netsrc_t sock, packetlag_t *list, packetlag_t *packet, netadr_t *from, size_t length, const void *data, float timestamp )
{
byte *pStart;
if( packet->prev || packet->next )
return;
packet->prev = list->prev;
list->prev->next = packet;
list->prev = packet;
packet->next = list;
pStart = (byte *)Z_Malloc( length );
memcpy( pStart, data, length );
packet->data = pStart;
packet->size = length;
packet->receivedtime = timestamp;
memcpy( &packet->from, from, sizeof( netadr_t ));
}
/*
==================
NET_AdjustLag
adjust time to next fake lag
==================
*/
static void NET_AdjustLag( void )
{
static double lasttime = 0.0;
float diff, converge;
double dt;
dt = host.realtime - lasttime;
dt = bound( 0.0, dt, 0.1 );
lasttime = host.realtime;
if( host_developer.value || !net_fakelag->value )
{
if( net_fakelag->value != net.fakelag )
{
diff = net_fakelag->value - net.fakelag;
converge = dt * 200.0f;
if( fabs( diff ) < converge )
converge = fabs( diff );
if( diff < 0.0 )
converge = -converge;
net.fakelag += converge;
}
}
else
{
Con_Printf( "Server must enable dev-mode to activate fakelag\n" );
Cvar_SetValue( "fakelag", 0.0 );
net.fakelag = 0.0f;
}
}
/*
==================
NET_LagPacket
add fake lagged packet into rececived message
==================
*/
static qboolean NET_LagPacket( qboolean newdata, netsrc_t sock, netadr_t *from, size_t *length, void *data )
{
packetlag_t *pNewPacketLag;
packetlag_t *pPacket;
int ninterval;
float curtime;
if( net.fakelag <= 0.0f )
{
NET_ClearLagData( true, true );
return newdata;
}
curtime = host.realtime;
if( newdata )
{
if( net_fakeloss->value != 0.0f )
{
if( host_developer.value )
{
net.losscount[sock]++;
if( net_fakeloss->value <= 0.0f )
{
ninterval = fabs( net_fakeloss->value );
if( ninterval < 2 ) ninterval = 2;
if(( net.losscount[sock] % ninterval ) == 0 )
return false;
}
else
{
if( COM_RandomLong( 0, 100 ) <= net_fakeloss->value )
return false;
}
}
else
{
Cvar_SetValue( "fakeloss", 0.0 );
}
}
pNewPacketLag = (packetlag_t *)Z_Malloc( sizeof( packetlag_t ));
// queue packet to simulate fake lag
NET_AddToLagged( sock, &net.lagdata[sock], pNewPacketLag, from, *length, data, curtime );
}
pPacket = net.lagdata[sock].next;
while( pPacket != &net.lagdata[sock] )
{
if( pPacket->receivedtime <= curtime - ( net.fakelag / 1000.0 ))
break;
pPacket = pPacket->next;
}
if( pPacket == &net.lagdata[sock] )
return false;
NET_RemoveFromPacketList( pPacket );
// delivery packet from fake lag queue
memcpy( data, pPacket->data, pPacket->size );
memcpy( &net_from, &pPacket->from, sizeof( netadr_t ));
*length = pPacket->size;
if( pPacket->data )
Mem_Free( pPacket->data );
Mem_Free( pPacket );
return true;
}
/*
==================
NET_GetLong
receive long packet from network
==================
*/
qboolean NET_GetLong( byte *pData, int size, int *outSize )
{
int i, sequence_number, offset;
SPLITPACKET *pHeader = (SPLITPACKET *)pData;
int packet_number;
int packet_count;
short packet_id;
if( size < sizeof( SPLITPACKET ))
{
Con_Printf( S_ERROR "invalid split packet length %i\n", size );
return false;
}
sequence_number = pHeader->sequence_number;
packet_id = pHeader->packet_id;
packet_count = ( packet_id & 0xFF );
packet_number = ( packet_id >> 8 );
if( packet_number >= NET_MAX_FRAGMENTS || packet_count > NET_MAX_FRAGMENTS )
{
Con_Printf( S_ERROR "malformed packet number (%i/%i)\n", packet_number + 1, packet_count );
return false;
}
if( net.split.current_sequence == -1 || sequence_number != net.split.current_sequence )
{
net.split.current_sequence = sequence_number;
net.split.split_count = packet_count;
net.split.total_size = 0;
// clear part's sequence
for( i = 0; i < NET_MAX_FRAGMENTS; i++ )
net.split_flags[i] = -1;
if( net_showpackets && net_showpackets->value == 4.0f )
Con_Printf( "<-- Split packet restart %i count %i seq\n", net.split.split_count, sequence_number );
}
size -= sizeof( SPLITPACKET );
if( net.split_flags[packet_number] != sequence_number )
{
if( packet_number == ( packet_count - 1 ))
net.split.total_size = size + SPLIT_SIZE * ( packet_count - 1 );
net.split.split_count--;
net.split_flags[packet_number] = sequence_number;
if( net_showpackets && net_showpackets->value == 4.0f )
Con_Printf( "<-- Split packet %i of %i, %i bytes %i seq\n", packet_number + 1, packet_count, size, sequence_number );
}
else
{
Con_DPrintf( "NET_GetLong: Ignoring duplicated split packet %i of %i ( %i bytes )\n", packet_number + 1, packet_count, size );
}
offset = (packet_number * SPLIT_SIZE);
memcpy( net.split.buffer + offset, pData + sizeof( SPLITPACKET ), size );
// have we received all of the pieces to the packet?
if( net.split.split_count <= 0 )
{
net.split.current_sequence = -1; // Clear packet
if( net.split.total_size > sizeof( net.split.buffer ))
{
Con_Printf( "Split packet too large! %d bytes\n", net.split.total_size );
return false;
}
memcpy( pData, net.split.buffer, net.split.total_size );
*outSize = net.split.total_size;
return true;
}
return false;
}
/*
==================
NET_QueuePacket
queue normal and lagged packets
==================
*/
qboolean NET_QueuePacket( netsrc_t sock, netadr_t *from, byte *data, size_t *length )
{
byte buf[NET_MAX_FRAGMENT];
int ret;
int net_socket;
int addr_len;
struct sockaddr addr;
*length = 0;
net_socket = net.ip_sockets[sock];
if( NET_IsSocketValid( net_socket ) )
{
addr_len = sizeof( addr );
ret = pRecvFrom( net_socket, buf, sizeof( buf ), 0, (struct sockaddr *)&addr, &addr_len );
if( !NET_IsSocketError( ret ) )
{
NET_SockadrToNetadr( &addr, from );
if( ret < NET_MAX_FRAGMENT )
{
// Transfer data
memcpy( data, buf, ret );
*length = ret;
// check for split message
if( *(int *)data == NET_HEADER_SPLITPACKET )
{
return NET_GetLong( data, ret, length );
}
// lag the packet, if needed
return NET_LagPacket( true, sock, from, length, data );
}
else
{
Con_Reportf( "NET_QueuePacket: oversize packet from %s\n", NET_AdrToString( *from ));
}
}
else
{
int err = pWSAGetLastError();
switch( err )
{
case WSAEWOULDBLOCK:
case WSAECONNRESET:
case WSAECONNREFUSED:
case WSAEMSGSIZE:
break;
default: // let's continue even after errors
Con_DPrintf( S_ERROR "NET_QueuePacket: %s from %s\n", NET_ErrorString(), NET_AdrToString( *from ));
break;
}
}
}
return NET_LagPacket( false, sock, from, length, data );
}
/*
==================
NET_GetPacket
Never called by the game logic, just the system event queing
==================
*/
qboolean NET_GetPacket( netsrc_t sock, netadr_t *from, byte *data, size_t *length )
{
if( !data || !length )
return false;
NET_AdjustLag();
if( NET_GetLoopPacket( sock, from, data, length ))
{
return NET_LagPacket( true, sock, from, length, data );
}
else
{
return NET_QueuePacket( sock, from, data, length );
}
}
/*
==================
NET_SendLong
Fragment long packets, send short directly
==================
*/
int NET_SendLong( netsrc_t sock, int net_socket, const char *buf, int len, int flags, const struct sockaddr *to, int tolen )
{
#ifdef NET_USE_FRAGMENTS
// do we need to break this packet up?
if( sock == NS_SERVER && len > MAX_ROUTEABLE_PACKET )
{
char packet[MAX_ROUTEABLE_PACKET];
int total_sent, size, packet_count;
int ret, packet_number;
SPLITPACKET *pPacket;
net.sequence_number++;
if( net.sequence_number <= 0 )
net.sequence_number = 1;
pPacket = (SPLITPACKET *)packet;
pPacket->sequence_number = net.sequence_number;
pPacket->net_id = NET_HEADER_SPLITPACKET;
packet_number = 0;
total_sent = 0;
packet_count = (len + SPLIT_SIZE - 1) / SPLIT_SIZE;
while( len > 0 )
{
size = Q_min( SPLIT_SIZE, len );
pPacket->packet_id = (packet_number << 8) + packet_count;
memcpy( packet + sizeof( SPLITPACKET ), buf + ( packet_number * SPLIT_SIZE ), size );
if( net_showpackets && net_showpackets->value == 3.0f )
{
netadr_t adr;
memset( &adr, 0, sizeof( adr ));
NET_SockadrToNetadr((struct sockaddr *)to, &adr );
Con_Printf( "Sending split %i of %i with %i bytes and seq %i to %s\n",
packet_number + 1, packet_count, size, net.sequence_number, NET_AdrToString( adr ));
}
ret = pSendTo( net_socket, packet, size + sizeof( SPLITPACKET ), flags, to, tolen );
if( ret < 0 ) return ret; // error
if( ret >= size )
total_sent += size;
len -= size;
packet_number++;
Sys_Sleep( 1 );
}
return total_sent;
}
else
#endif
{
// no fragmenantion for client connection
return pSendTo( net_socket, buf, len, flags, to, tolen );
}
}
/*
==================
NET_SendPacket
==================
*/
void NET_SendPacket( netsrc_t sock, size_t length, const void *data, netadr_t to )
{
int ret;
struct sockaddr addr;
SOCKET net_socket;
if( !net.initialized || to.type == NA_LOOPBACK )
{
NET_SendLoopPacket( sock, length, data, to );
return;
}
else if( to.type == NA_BROADCAST )
{
net_socket = net.ip_sockets[sock];
if( !NET_IsSocketValid( net_socket ) )
return;
}
else if( to.type == NA_IP )
{
net_socket = net.ip_sockets[sock];
if( !NET_IsSocketValid( net_socket ) )
return;
}
else
{
Host_Error( "NET_SendPacket: bad address type %i\n", to.type );
}
NET_NetadrToSockadr( &to, &addr );
ret = NET_SendLong( sock, net_socket, data, length, 0, &addr, sizeof( addr ));
if( NET_IsSocketError( ret ))
{
int err = pWSAGetLastError();
// WSAEWOULDBLOCK is silent
if( err == WSAEWOULDBLOCK )
return;
// some PPP links don't allow broadcasts
if( err == WSAEADDRNOTAVAIL && to.type == NA_BROADCAST )
return;
if( Host_IsDedicated() )
{
Con_DPrintf( S_ERROR "NET_SendPacket: %s to %s\n", NET_ErrorString(), NET_AdrToString( to ));
}
else if( err == WSAEADDRNOTAVAIL || err == WSAENOBUFS )
{
Con_DPrintf( S_ERROR "NET_SendPacket: %s to %s\n", NET_ErrorString(), NET_AdrToString( to ));
}
else
{
Host_Error( "NET_SendPacket: %s to %s\n", NET_ErrorString(), NET_AdrToString( to ));
}
}
}
/*
====================
NET_BufferToBufferCompress
generic fast compression
====================
*/
qboolean NET_BufferToBufferCompress( char *dest, uint *destLen, char *source, uint sourceLen )
{
uint uCompressedLen = 0;
byte *pbOut = NULL;
memcpy( dest, source, sourceLen );
pbOut = LZSS_Compress( source, sourceLen, &uCompressedLen );
if( pbOut && uCompressedLen > 0 && uCompressedLen <= *destLen )
{
memcpy( dest, pbOut, uCompressedLen );
*destLen = uCompressedLen;
free( pbOut );
return true;
}
else
{
if( pbOut ) free( pbOut );
memcpy( dest, source, sourceLen );
*destLen = sourceLen;
return false;
}
}
/*
====================
NET_BufferToBufferDecompress
generic fast decompression
====================
*/
qboolean NET_BufferToBufferDecompress( char *dest, uint *destLen, char *source, uint sourceLen )
{
if( LZSS_IsCompressed( source ))
{
uint uDecompressedLen = LZSS_GetActualSize( source );
if( uDecompressedLen <= *destLen )
{
*destLen = LZSS_Decompress( source, dest );
}
else
{
return false;
}
}
else
{
memcpy( dest, source, sourceLen );
*destLen = sourceLen;
}
return true;
}
/*
====================
NET_IPSocket
====================
*/
static int NET_IPSocket( const char *net_interface, int port, qboolean multicast )
{
struct sockaddr_in addr;
int err, net_socket;
uint optval = 1;
dword _true = 1;
if( NET_IsSocketError(( net_socket = pSocket( PF_INET, SOCK_DGRAM, IPPROTO_UDP )) ) )
{
err = pWSAGetLastError();
if( err != WSAEAFNOSUPPORT )
Con_DPrintf( S_WARN "NET_UDPSocket: port: %d socket: %s\n", port, NET_ErrorString( ));
return INVALID_SOCKET;
}
if( NET_IsSocketError( pIoctlSocket( net_socket, FIONBIO, &_true ) ) )
{
Con_DPrintf( S_WARN "NET_UDPSocket: port: %d ioctl FIONBIO: %s\n", port, NET_ErrorString( ));
pCloseSocket( net_socket );
return INVALID_SOCKET;
}
// make it broadcast capable
if( NET_IsSocketError( pSetSockopt( net_socket, SOL_SOCKET, SO_BROADCAST, (char *)&_true, sizeof( _true ) ) ) )
{
Con_DPrintf( S_WARN "NET_UDPSocket: port: %d setsockopt SO_BROADCAST: %s\n", port, NET_ErrorString( ));
pCloseSocket( net_socket );
return INVALID_SOCKET;
}
if( Sys_CheckParm( "-reuse" ) || multicast )
{
if( NET_IsSocketError( pSetSockopt( net_socket, SOL_SOCKET, SO_REUSEADDR, (const char *)&optval, sizeof( optval )) ) )
{
Con_DPrintf( S_WARN "NET_UDPSocket: port: %d setsockopt SO_REUSEADDR: %s\n", port, NET_ErrorString( ));
pCloseSocket( net_socket );
return INVALID_SOCKET;
}
}
if( Sys_CheckParm( "-tos" ))
{
optval = 16;
Con_Printf( "Enabling LOWDELAY TOS option\n" );
if( NET_IsSocketError( pSetSockopt( net_socket, IPPROTO_IP, IP_TOS, (const char *)&optval, sizeof( optval )) ) )
{
err = pWSAGetLastError();
if( err != WSAENOPROTOOPT )
Con_Printf( S_WARN "NET_UDPSocket: port: %d setsockopt IP_TOS: %s\n", port, NET_ErrorString( ));
pCloseSocket( net_socket );
return INVALID_SOCKET;
}
}
if( !net_interface[0] || !Q_stricmp( net_interface, "localhost" ))
addr.sin_addr.s_addr = INADDR_ANY;
else NET_StringToSockaddr( net_interface, (struct sockaddr *)&addr, false );
if( port == PORT_ANY ) addr.sin_port = 0;
else addr.sin_port = pHtons((short)port);
addr.sin_family = AF_INET;
if( NET_IsSocketError( pBind( net_socket, (void *)&addr, sizeof( addr )) ) )
{
Con_DPrintf( S_WARN "NET_UDPSocket: port: %d bind: %s\n", port, NET_ErrorString( ));
pCloseSocket( net_socket );
return INVALID_SOCKET;
}
if( Sys_CheckParm( "-loopback" ))
{
optval = 1;
if( NET_IsSocketError( pSetSockopt( net_socket, IPPROTO_IP, IP_MULTICAST_LOOP, (const char *)&optval, sizeof( optval )) ) )
Con_DPrintf( S_WARN "NET_UDPSocket: port %d setsockopt IP_MULTICAST_LOOP: %s\n", port, NET_ErrorString( ));
}
return net_socket;
}
/*
====================
NET_OpenIP
====================
*/
static void NET_OpenIP( void )
{
int port, sv_port = 0, cl_port = 0;
if( !NET_IsSocketValid( net.ip_sockets[NS_SERVER] ) )
{
port = net_iphostport->value;
if( !port ) port = net_hostport->value;
if( !port ) port = PORT_SERVER; // forcing to default
net.ip_sockets[NS_SERVER] = NET_IPSocket( net_ipname->string, port, false );
if( !NET_IsSocketValid( net.ip_sockets[NS_SERVER] ) && Host_IsDedicated() )
Host_Error( "Couldn't allocate dedicated server IP port %d.\n", port );
sv_port = port;
}
// dedicated servers don't need client ports
if( Host_IsDedicated() ) return;
if( !NET_IsSocketValid( net.ip_sockets[NS_CLIENT] ) )
{
port = net_ipclientport->value;
if( !port ) port = net_clientport->value;
if( !port ) port = PORT_ANY; // forcing to default
net.ip_sockets[NS_CLIENT] = NET_IPSocket( net_ipname->string, port, false );
if( !NET_IsSocketValid( net.ip_sockets[NS_CLIENT] ) )
net.ip_sockets[NS_CLIENT] = NET_IPSocket( net_ipname->string, PORT_ANY, false );
cl_port = port;
}
}
/*
================
NET_GetLocalAddress
Returns the servers' ip address as a string.
================
*/
void NET_GetLocalAddress( void )
{
char buff[512];
struct sockaddr_in address;
int namelen;
memset( &net_local, 0, sizeof( netadr_t ));
buff[0] = '\0';
if( net.allow_ip )
{
// If we have changed the ip var from the command line, use that instead.
if( Q_strcmp( net_ipname->string, "localhost" ))
{
Q_strcpy( buff, net_ipname->string );
}
else
{
pGetHostName( buff, 512 );
}
// ensure that it doesn't overrun the buffer
buff[511] = 0;
if( NET_StringToAdr( buff, &net_local ))
{
namelen = sizeof( address );
if( NET_IsSocketError( pGetSockName( net.ip_sockets[NS_SERVER], (struct sockaddr *)&address, &namelen ) ) )
{
// this may happens if multiple clients running on single machine
Con_DPrintf( S_ERROR "Could not get TCP/IP address. Reason: %s\n", NET_ErrorString( ));
// net.allow_ip = false;
}
else
{
net_local.port = address.sin_port;
Con_Printf( "Server IP address %s\n", NET_AdrToString( net_local ));
Cvar_FullSet( "net_address", va( "%s", NET_AdrToString( net_local )), FCVAR_READ_ONLY );
}
}
else
{
Con_DPrintf( S_ERROR "Could not get TCP/IP address, Invalid hostname: '%s'\n", buff );
}
}
else
{
Con_Printf( "TCP/IP Disabled.\n" );
}
}
/*
====================
NET_Config
A single player game will only use the loopback code
====================
*/
void NET_Config( qboolean multiplayer )
{
static qboolean bFirst = true;
static qboolean old_config;
if( !net.initialized )
return;
if( old_config == multiplayer )
return;
old_config = multiplayer;
if( multiplayer )
{
// open sockets
if( net.allow_ip ) NET_OpenIP();
// get our local address, if possible
if( bFirst )
{
NET_GetLocalAddress();
bFirst = false;
}
}
else
{
int i;
// shut down any existing sockets
for( i = 0; i < NS_COUNT; i++ )
{
if( net.ip_sockets[i] != INVALID_SOCKET )
{
pCloseSocket( net.ip_sockets[i] );
net.ip_sockets[i] = INVALID_SOCKET;
}
}
}
NET_ClearLoopback ();
net.configured = multiplayer ? true : false;
}
/*
====================
NET_IsConfigured
Is winsock ip initialized?
====================
*/
qboolean NET_IsConfigured( void )
{
return net.configured;
}
/*
====================
NET_IsActive
====================
*/
qboolean NET_IsActive( void )
{
return net.initialized;
}
/*
====================
NET_Sleep
sleeps msec or until net socket is ready
====================
*/
void NET_Sleep( int msec )
{
struct timeval timeout;
fd_set fdset;
int i = 0;
if( !net.initialized || host.type == HOST_NORMAL )
return; // we're not a dedicated server, just run full speed
FD_ZERO( &fdset );
if( net.ip_sockets[NS_SERVER] != INVALID_SOCKET )
{
FD_SET( net.ip_sockets[NS_SERVER], &fdset ); // network socket
i = net.ip_sockets[NS_SERVER];
}
timeout.tv_sec = msec / 1000;
timeout.tv_usec = (msec % 1000) * 1000;
pSelect( i+1, &fdset, NULL, NULL, &timeout );
}
/*
====================
NET_ClearLagData
clear fakelag list
====================
*/
void NET_ClearLagData( qboolean bClient, qboolean bServer )
{
if( bClient ) NET_ClearLaggedList( &net.lagdata[NS_CLIENT] );
if( bServer ) NET_ClearLaggedList( &net.lagdata[NS_SERVER] );
}
/*
====================
NET_Init
====================
*/
void NET_Init( void )
{
char cmd[64];
int i = 1;
if( net.initialized ) return;
net_clockwindow = Cvar_Get( "clockwindow", "0.5", 0, "timewindow to execute client moves" );
net_address = Cvar_Get( "net_address", "0", FCVAR_READ_ONLY, "contain local address of current client" );
net_ipname = Cvar_Get( "ip", "localhost", FCVAR_READ_ONLY, "network ip address" );
net_iphostport = Cvar_Get( "ip_hostport", "0", FCVAR_READ_ONLY, "network ip host port" );
net_hostport = Cvar_Get( "hostport", va( "%i", PORT_SERVER ), FCVAR_READ_ONLY, "network default host port" );
net_ipclientport = Cvar_Get( "ip_clientport", "0", FCVAR_READ_ONLY, "network ip client port" );
net_clientport = Cvar_Get( "clientport", va( "%i", PORT_CLIENT ), FCVAR_READ_ONLY, "network default client port" );
net_fakelag = Cvar_Get( "fakelag", "0", 0, "lag all incoming network data (including loopback) by xxx ms." );
net_fakeloss = Cvar_Get( "fakeloss", "0", 0, "act like we dropped the packet this % of the time." );
// prepare some network data
for( i = 0; i < NS_COUNT; i++ )
{
net.lagdata[i].prev = &net.lagdata[i];
net.lagdata[i].next = &net.lagdata[i];
net.ip_sockets[i] = INVALID_SOCKET;
}
#ifdef _WIN32
if( !NET_OpenWinSock( )) // loading wsock32.dll
{
Con_DPrintf( S_ERROR "network failed to load wsock32.dll.\n" );
return;
}
if( pWSAStartup( MAKEWORD( 1, 1 ), &net.winsockdata ))
{
Con_DPrintf( S_ERROR "network initialization failed.\n" );
NET_FreeWinSock();
return;
}
#else
// we have pthreads by default
net.threads_initialized = true;
#endif
if( Sys_CheckParm( "-noip" ))
net.allow_ip = false;
else net.allow_ip = true;
// specify custom host port
if( Sys_GetParmFromCmdLine( "-port", cmd ) && Q_isdigit( cmd ))
Cvar_FullSet( "hostport", cmd, FCVAR_READ_ONLY );
// adjust clockwindow
if( Sys_GetParmFromCmdLine( "-clockwindow", cmd ))
Cvar_SetValue( "clockwindow", Q_atof( cmd ));
net.sequence_number = 1;
net.initialized = true;
Con_Reportf( "Base networking initialized.\n" );
}
/*
====================
NET_Shutdown
====================
*/
void NET_Shutdown( void )
{
if( !net.initialized )
return;
NET_ClearLagData( true, true );
NET_Config( false );
#ifdef _WIN32
pWSACleanup();
NET_FreeWinSock();
#endif
net.initialized = false;
}