ref: 91c079724e36fdcf6a8a00262ff12f678ee50a22
dir: /QW/client/net_udp.c/
/*
Copyright (C) 1996-1997 Id Software, Inc.
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 2
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// net_main.c
#include "quakedef.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#include <errno.h>
#if defined(sun)
#include <unistd.h>
#endif
#ifdef sun
#include <sys/filio.h>
#endif
#ifdef NeXT
#include <libc.h>
#endif
netadr_t net_local_adr;
netadr_t net_from;
sizebuf_t net_message;
int net_socket; // non blocking, for receives
int net_send_socket; // blocking, for sends
#define MAX_UDP_PACKET 8192
byte net_message_buffer[MAX_UDP_PACKET];
int gethostname (char *, int);
int close (int);
//=============================================================================
void NetadrToSockadr (netadr_t *a, struct sockaddr_in *s)
{
memset (s, 0, sizeof(*s));
s->sin_family = AF_INET;
*(int *)&s->sin_addr = *(int *)&a->ip;
s->sin_port = a->port;
}
void SockadrToNetadr (struct sockaddr_in *s, netadr_t *a)
{
*(int *)&a->ip = *(int *)&s->sin_addr;
a->port = s->sin_port;
}
qboolean NET_CompareBaseAdr (netadr_t a, netadr_t b)
{
if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3])
return true;
return false;
}
qboolean NET_CompareAdr (netadr_t a, netadr_t b)
{
if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3] && a.port == b.port)
return true;
return false;
}
char *NET_AdrToString (netadr_t a)
{
static char s[64];
sprintf (s, "%i.%i.%i.%i:%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3], ntohs(a.port));
return s;
}
char *NET_BaseAdrToString (netadr_t a)
{
static char s[64];
sprintf (s, "%i.%i.%i.%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3]);
return s;
}
/*
=============
NET_StringToAdr
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
=============
*/
qboolean NET_StringToAdr (char *s, netadr_t *a)
{
struct hostent *h;
struct sockaddr_in sadr;
char *colon;
char copy[128];
memset (&sadr, 0, sizeof(sadr));
sadr.sin_family = AF_INET;
sadr.sin_port = 0;
strcpy (copy, s);
// strip off a trailing :port if present
for (colon = copy ; *colon ; colon++)
if (*colon == ':')
{
*colon = 0;
sadr.sin_port = htons(atoi(colon+1));
}
if (copy[0] >= '0' && copy[0] <= '9')
{
*(int *)&sadr.sin_addr = inet_addr(copy);
}
else
{
if (! (h = gethostbyname(copy)) )
return 0;
*(int *)&sadr.sin_addr = *(int *)h->h_addr_list[0];
}
SockadrToNetadr (&sadr, a);
return true;
}
// Returns true if we can't bind the address locally--in other words,
// the IP is NOT one of our interfaces.
qboolean NET_IsClientLegal(netadr_t *adr)
{
struct sockaddr_in sadr;
int newsocket;
#if 0
if (adr->ip[0] == 127)
return false; // no local connections period
NetadrToSockadr (adr, &sadr);
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
Sys_Error ("NET_IsClientLegal: socket:", strerror(errno));
sadr.sin_port = 0;
if( bind (newsocket, (void *)&sadr, sizeof(sadr)) == -1)
{
// It is not a local address
close(newsocket);
return true;
}
close(newsocket);
return false;
#else
return true;
#endif
}
//=============================================================================
qboolean NET_GetPacket (void)
{
int ret;
struct sockaddr_in from;
int fromlen;
fromlen = sizeof(from);
ret = recvfrom (net_socket, net_message_buffer, sizeof(net_message_buffer), 0, (struct sockaddr *)&from, &fromlen);
if (ret == -1) {
if (errno == EWOULDBLOCK)
return false;
if (errno == ECONNREFUSED)
return false;
Sys_Printf ("NET_GetPacket: %s\n", strerror(errno));
return false;
}
net_message.cursize = ret;
SockadrToNetadr (&from, &net_from);
return ret;
}
//=============================================================================
void NET_SendPacket (int length, void *data, netadr_t to)
{
int ret;
struct sockaddr_in addr;
NetadrToSockadr (&to, &addr);
ret = sendto (net_socket, data, length, 0, (struct sockaddr *)&addr, sizeof(addr) );
if (ret == -1) {
if (errno == EWOULDBLOCK)
return;
if (errno == ECONNREFUSED)
return;
Sys_Printf ("NET_SendPacket: %s\n", strerror(errno));
}
}
//=============================================================================
int UDP_OpenSocket (int port)
{
int newsocket;
struct sockaddr_in address;
qboolean _true = true;
int i;
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
Sys_Error ("UDP_OpenSocket: socket:", strerror(errno));
if (ioctl (newsocket, FIONBIO, (char *)&_true) == -1)
Sys_Error ("UDP_OpenSocket: ioctl FIONBIO:", strerror(errno));
address.sin_family = AF_INET;
//ZOID -- check for interface binding option
if ((i = COM_CheckParm("-ip")) != 0 && i < com_argc) {
address.sin_addr.s_addr = inet_addr(com_argv[i+1]);
Con_Printf("Binding to IP Interface Address of %s\n",
inet_ntoa(address.sin_addr));
} else
address.sin_addr.s_addr = INADDR_ANY;
if (port == PORT_ANY)
address.sin_port = 0;
else
address.sin_port = htons((short)port);
if( bind (newsocket, (void *)&address, sizeof(address)) == -1)
Sys_Error ("UDP_OpenSocket: bind: %s", strerror(errno));
return newsocket;
}
void NET_GetLocalAddress (void)
{
char buff[MAXHOSTNAMELEN];
struct sockaddr_in address;
int namelen;
gethostname(buff, MAXHOSTNAMELEN);
buff[MAXHOSTNAMELEN-1] = 0;
NET_StringToAdr (buff, &net_local_adr);
namelen = sizeof(address);
if (getsockname (net_socket, (struct sockaddr *)&address, &namelen) == -1)
Sys_Error ("NET_Init: getsockname:", strerror(errno));
net_local_adr.port = address.sin_port;
Con_Printf("IP address %s\n", NET_AdrToString (net_local_adr) );
}
/*
====================
NET_Init
====================
*/
void NET_Init (int port)
{
//
// open the single socket to be used for all communications
//
net_socket = UDP_OpenSocket (port);
//
// init the message buffer
//
net_message.maxsize = sizeof(net_message_buffer);
net_message.data = net_message_buffer;
//
// determine my name & address
//
NET_GetLocalAddress ();
Con_Printf("UDP Initialized\n");
}
/*
====================
NET_Shutdown
====================
*/
void NET_Shutdown (void)
{
close (net_socket);
}