gtkradiant/libs/l_net/l_net.c

/*
Copyright (C) 1999-2006 Id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant 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 2 of the License, or
(at your option) any later version.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

//====================================================================
//
// Name:			l_net.c
// Function:		-
// Programmer:		MrElusive
// Last update:		-
// Tab size:		3
// Notes:
//====================================================================

#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include "l_net.h"
#include "l_net_wins.h"

#define GetMemory malloc
#define FreeMemory free

#define qtrue	1
#define qfalse	0

#ifdef _DEBUG
void WinPrint(char *str, ...)
{
	va_list argptr;
  char text[4096];

  va_start (argptr,str);
	vsprintf (text, str, argptr);
	va_end (argptr);

  printf(text);
}
#else
void WinPrint(char *str, ...)
{
}
#endif

//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void Net_SetAddressPort(address_t *address, int port)
{
	sockaddr_t addr;

	WINS_StringToAddr(address->ip, &addr);
	WINS_SetSocketPort(&addr, port);
	strcpy(address->ip, WINS_AddrToString(&addr));
} //end of the function Net_SetAddressPort
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int Net_AddressCompare(address_t *addr1, address_t *addr2)
{
#ifdef WIN32
  return _stricmp(addr1->ip, addr2->ip);
#else
  return strcasecmp(addr1->ip, addr2->ip);
#endif
} //end of the function Net_AddressCompare
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void Net_SocketToAddress(socket_t *sock, address_t *address)
{
	strcpy(address->ip, WINS_AddrToString(&sock->addr));
} //end of the function Net_SocketToAddress
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int Net_Send(socket_t *sock, netmessage_t *msg)
{
	int size;

	size = msg->size;
	msg->size = 0;
	NMSG_WriteLong(msg, size-4);
	msg->size = size;
	//WinPrint("Net_Send: message of size %d\n", sendmsg.size);
	return WINS_Write(sock->socket, msg->data, msg->size, NULL);
} //end of the function Net_SendSocketReliable
//===========================================================================
// returns the number of bytes recieved
// -1 on error
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int Net_Receive(socket_t *sock, netmessage_t *msg)
{
	int curread;

	if (sock->remaining > 0)
	{
		curread = WINS_Read(sock->socket, &sock->msg.data[sock->msg.size], sock->remaining, NULL);
		if (curread == -1)
		{
			WinPrint("Net_Receive: read error\n");
			return -1;
		} //end if
		sock->remaining -= curread;
		sock->msg.size += curread;
		if (sock->remaining <= 0)
		{
			sock->remaining = 0;
			memcpy(msg, &sock->msg, sizeof(netmessage_t));
			sock->msg.size = 0;
			return msg->size - 4;
		} //end if
		return 0;
	} //end if
	sock->msg.size = WINS_Read(sock->socket, sock->msg.data, 4, NULL);
	if (sock->msg.size == 0) return 0;
	if (sock->msg.size == -1)
	{
		WinPrint("Net_Receive: size header read error\n");
		return -1;
	} //end if
	//WinPrint("Net_Receive: message size header %d\n", msg->size);
	sock->msg.read = 0;
	sock->remaining = NMSG_ReadLong(&sock->msg);
	if (sock->remaining == 0) return 0;
	if (sock->remaining < 0 || sock->remaining > MAX_NETMESSAGE)
	{
		WinPrint("Net_Receive: invalid message size %d\n", sock->remaining);
		return -1;
	} //end if
	//try to read the message
	curread = WINS_Read(sock->socket, &sock->msg.data[sock->msg.size], sock->remaining, NULL);
	if (curread == -1)
	{
		WinPrint("Net_Receive: read error\n");
		return -1;
	} //end if
	sock->remaining -= curread;
	sock->msg.size += curread;
	if (sock->remaining <= 0)
	{
		sock->remaining = 0;
		memcpy(msg, &sock->msg, sizeof(netmessage_t));
		sock->msg.size = 0;
		return msg->size - 4;
	} //end if
	//the message has not been completely read yet
#ifdef _DEBUG
  printf("++timo TODO: debug the Net_Receive on big size messages\n");
#endif
	return 0;
} //end of the function Net_Receive
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
socket_t *Net_AllocSocket(void)
{
	socket_t *sock;

	sock = (socket_t *) GetMemory(sizeof(socket_t));
	memset(sock, 0, sizeof(socket_t));
	return sock;
} //end of the function Net_AllocSocket
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void Net_FreeSocket(socket_t *sock)
{
	FreeMemory(sock);
} //end of the function Net_FreeSocket
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
socket_t *Net_Connect(address_t *address, int port)
{
	int newsock;
	socket_t *sock;
	sockaddr_t sendaddr;

	// see if we can resolve the host name
	WINS_StringToAddr(address->ip, &sendaddr);

  newsock = WINS_OpenReliableSocket(port);
	if (newsock == -1) return NULL;

	sock = Net_AllocSocket();
	if (sock == NULL)
	{
		WINS_CloseSocket(newsock);
		return NULL;
	} //end if
	sock->socket = newsock;

	//connect to the host
	if (WINS_Connect(newsock, &sendaddr) == -1)
	{
		Net_FreeSocket(sock);
		WINS_CloseSocket(newsock);
		WinPrint("Net_Connect: error connecting\n");
		return NULL;
	} //end if

	memcpy(&sock->addr, &sendaddr, sizeof(sockaddr_t));
	//now we can send messages
	//
	return sock;
} //end of the function Net_Connect

//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
socket_t *Net_ListenSocket(int port)
{
	int newsock;
	socket_t *sock;

	newsock = WINS_OpenReliableSocket(port);
	if (newsock == -1) return NULL;

	if (WINS_Listen(newsock) == -1)
	{
		WINS_CloseSocket(newsock);
		return NULL;
	} //end if
	sock = Net_AllocSocket();
	if (sock == NULL)
	{
		WINS_CloseSocket(newsock);
		return NULL;
	} //end if
	sock->socket = newsock;
	WINS_GetSocketAddr(newsock, &sock->addr);
	WinPrint("listen socket opened at %s\n", WINS_AddrToString(&sock->addr));
	//
	return sock;
} //end of the function Net_ListenSocket
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
socket_t *Net_Accept(socket_t *sock)
{
	int newsocket;
	sockaddr_t sendaddr;
	socket_t *newsock;

	newsocket = WINS_Accept(sock->socket, &sendaddr);
	if (newsocket == -1) return NULL;

	newsock = Net_AllocSocket();
	if (newsock == NULL)
	{
		WINS_CloseSocket(newsocket);
		return NULL;
	} //end if
	newsock->socket = newsocket;
	memcpy(&newsock->addr, &sendaddr, sizeof(sockaddr_t));
	//
	return newsock;
} //end of the function Net_Accept
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void Net_Disconnect(socket_t *sock)
{
	WINS_CloseSocket(sock->socket);
	Net_FreeSocket(sock);
} //end of the function Net_Disconnect
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void Net_StringToAddress(char *string, address_t *address)
{
	strcpy(address->ip, string);
} //end of the function Net_StringToAddress
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void Net_MyAddress(address_t *address)
{
	strcpy(address->ip, WINS_MyAddress());
} //end of the function Net_MyAddress
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int Net_Setup(void)
{
	WINS_Init();
	//
	WinPrint("my address is %s\n", WINS_MyAddress());
	//
	return qtrue;
} //end of the function Net_Setup
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void Net_Shutdown(void)
{
	WINS_Shutdown();
} //end of the function Net_Shutdown
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_Clear(netmessage_t *msg)
{
	msg->size = 4;
} //end of the function NMSG_Clear
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_WriteChar (netmessage_t *msg, int c)
{
	if (c < -128 || c > 127)
		WinPrint("NMSG_WriteChar: range error\n");

	if (msg->size >= MAX_NETMESSAGE)
	{
		WinPrint("NMSG_WriteChar: overflow\n");
		return;
	} //end if
	msg->data[msg->size] = c;
	msg->size++;
} //end of the function NMSG_WriteChar
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_WriteByte(netmessage_t *msg, int c)
{
	if (c < -128 || c > 127)
		WinPrint("NMSG_WriteByte: range error\n");

	if (msg->size + 1 >= MAX_NETMESSAGE)
	{
		WinPrint("NMSG_WriteByte: overflow\n");
		return;
	} //end if
	msg->data[msg->size] = c;
	msg->size++;
} //end of the function NMSG_WriteByte
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_WriteShort(netmessage_t *msg, int c)
{
	if (c < ((short)0x8000) || c > (short)0x7fff)
		WinPrint("NMSG_WriteShort: range error");

	if (msg->size + 2 >= MAX_NETMESSAGE)
	{
		WinPrint("NMSG_WriteShort: overflow\n");
		return;
	} //end if
	msg->data[msg->size] = c&0xff;
	msg->data[msg->size+1] = c>>8;
	msg->size += 2;
} //end of the function NMSG_WriteShort
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_WriteLong(netmessage_t *msg, int c)
{
	if (msg->size + 4 >= MAX_NETMESSAGE)
	{
		WinPrint("NMSG_WriteLong: overflow\n");
		return;
	} //end if
	msg->data[msg->size] = c&0xff;
	msg->data[msg->size+1] = (c>>8)&0xff;
	msg->data[msg->size+2] = (c>>16)&0xff;
	msg->data[msg->size+3] = c>>24;
	msg->size += 4;
} //end of the function NMSG_WriteLong
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_WriteFloat(netmessage_t *msg, float c)
{
	if (msg->size + 4 >= MAX_NETMESSAGE)
	{
		WinPrint("NMSG_WriteLong: overflow\n");
		return;
	} //end if
	msg->data[msg->size] = *((int *)&c)&0xff;
	msg->data[msg->size+1] = (*((int *)&c)>>8)&0xff;
	msg->data[msg->size+2] = (*((int *)&c)>>16)&0xff;
	msg->data[msg->size+3] = *((int *)&c)>>24;
	msg->size += 4;
} //end of the function NMSG_WriteFloat
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_WriteString(netmessage_t *msg, char *string)
{
	if (msg->size + strlen(string) + 1 >= MAX_NETMESSAGE)
	{
		WinPrint("NMSG_WriteString: overflow\n");
		return;
	} //end if
	strcpy(&msg->data[msg->size], string);
	msg->size += strlen(string) + 1;
} //end of the function NMSG_WriteString
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void NMSG_ReadStart(netmessage_t *msg)
{
	msg->readoverflow = qfalse;
	msg->read = 4;
} //end of the function NMSG_ReadStart
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int NMSG_ReadChar(netmessage_t *msg)
{
	if (msg->size + 1 > msg->size)
	{
		msg->readoverflow = qtrue;
		WinPrint("NMSG_ReadChar: read overflow\n");
		return 0;
	} //end if
	msg->read++;
	return msg->data[msg->read-1];
} //end of the function NMSG_ReadChar
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int NMSG_ReadByte(netmessage_t *msg)
{
	if (msg->read + 1 > msg->size)
	{
		msg->readoverflow = qtrue;
		WinPrint("NMSG_ReadByte: read overflow\n");
		return 0;
	} //end if
	msg->read++;
	return msg->data[msg->read-1];
} //end of the function NMSG_ReadByte
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int NMSG_ReadShort(netmessage_t *msg)
{
	int c;

	if (msg->read + 2 > msg->size)
	{
		msg->readoverflow = qtrue;
		WinPrint("NMSG_ReadShort: read overflow\n");
		return 0;
	} //end if
	c = (short)(msg->data[msg->read] + (msg->data[msg->read+1]<<8));
	msg->read += 2;
	return c;
} //end of the function NMSG_ReadShort
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int NMSG_ReadLong(netmessage_t *msg)
{
	int c;

	if (msg->read + 4 > msg->size)
	{
		msg->readoverflow = qtrue;
		WinPrint("NMSG_ReadLong: read overflow\n");
		return 0;
	} //end if
	c = msg->data[msg->read]
		+ (msg->data[msg->read+1]<<8)
		+ (msg->data[msg->read+2]<<16)
		+ (msg->data[msg->read+3]<<24);
	msg->read += 4;
	return c;
} //end of the function NMSG_ReadLong
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
float NMSG_ReadFloat(netmessage_t *msg)
{
	int c;

	if (msg->read + 4 > msg->size)
	{
		msg->readoverflow = qtrue;
		WinPrint("NMSG_ReadLong: read overflow\n");
		return 0;
	} //end if
	c = msg->data[msg->read]
		+ (msg->data[msg->read+1]<<8)
		+ (msg->data[msg->read+2]<<16)
		+ (msg->data[msg->read+3]<<24);
	msg->read += 4;
	return *(float *)&c;
} //end of the function NMSG_ReadFloat
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
char *NMSG_ReadString(netmessage_t *msg)
{
	static char	string[2048];
	int l, c;
	
	l = 0;
	do
	{
		if (msg->read + 1 > msg->size)
		{
			msg->readoverflow = qtrue;
			WinPrint("NMSG_ReadString: read overflow\n");
			string[l] = 0;
			return string;
		} //end if
		c = msg->data[msg->read];
		msg->read++;
		if (c == 0) break;
		string[l] = c;
		l++;
	} while (l < sizeof(string)-1);
	string[l] = 0;
	return string;
} //end of the function NMSG_ReadString