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quakeforge/qw/source/net_udp.c
Bill Currie 2bfeed6820 looks like utils is more or less complete for now, except for some fixes in 
nq for abyss etc (ie, the magical -<mod> args).
The interface to the message subsystem got a revamp and all the mods to the .c
files reflect this. currently a little ugly, but I plan on abstracting msg
further to clean it up and make it more oo.
2001-02-23 23:16:13 +00:00

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/*
net_udp.c
(description)
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 2000 Marcus Sundberg [mackan@stacken.kth.se]
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
#ifdef NeXT
# include <libc.h>
#endif
#include "console.h"
#include "msg.h"
#include "net.h"
#include "sys.h"
#include "qargs.h"
#ifdef _WIN32
# include <windows.h>
# undef EWOULDBLOCK
# define EWOULDBLOCK WSAEWOULDBLOCK
#endif
#ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 512
#endif
#ifndef HAVE_SOCKLEN_T
# ifdef HAVE_SIZE
typedef size_t socklen_t;
# else
typedef unsigned int socklen_t;
# endif
#endif
netadr_t net_local_adr;
netadr_t net_from;
int net_socket;
static sizebuf_t _net_message_message;
static msg_t _net_message = {0, 0, &_net_message_message};
msg_t *net_message = &_net_message;
extern qboolean is_server;
#define MAX_UDP_PACKET (MAX_MSGLEN*2)
byte net_message_buffer[MAX_UDP_PACKET];
#ifdef _WIN32
WSADATA winsockdata;
#endif
//=============================================================================
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];
snprintf (s, sizeof (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];
snprintf (s, sizeof (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 ((unsigned short) 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)
{
#if 0
struct sockaddr_in sadr;
int newsocket;
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;
socklen_t fromlen;
fromlen = sizeof (from);
ret =
recvfrom (net_socket, (void *) net_message_buffer,
sizeof (net_message_buffer), 0, (struct sockaddr *) &from,
&fromlen);
SockadrToNetadr (&from, &net_from);
if (ret == -1) {
#ifdef _WIN32
int err = WSAGetLastError ();
if (err == WSAEMSGSIZE) {
Con_Printf ("Warning: Oversize packet from %s\n",
NET_AdrToString (net_from));
return false;
}
if (err == 10054) {
Con_DPrintf ("error 10054 from %s\n", NET_AdrToString (net_from));
return false;
}
#else /* _WIN32 */
int err = errno;
if (err == ECONNREFUSED)
return false;
#endif /* _WIN32 */
if (err == EWOULDBLOCK)
return false;
Sys_Printf ("NET_GetPacket: %s\n", strerror (err));
return false;
}
// Check for malformed packets
if (is_server && ntohs(net_from.port)<1024) {
Con_Printf ("Warning: Packet from %s dropped: Bad port\n",
NET_AdrToString (net_from));
return false;
}
if (from.sin_addr.s_addr==INADDR_ANY || from.sin_addr.s_addr==INADDR_BROADCAST) {
Con_Printf ("Warning: Packet dropped - bad address\n");
return false;
}
_net_message_message.cursize = ret;
if (ret == sizeof (net_message_buffer)) {
Con_Printf ("Oversize packet from %s\n", NET_AdrToString (net_from));
return false;
}
#ifdef PACKET_LOGGING
Log_Incoming_Packet(net_message_buffer,_net_message_message.cursize);
#endif
return ret;
}
//=============================================================================
void
NET_SendPacket (int length, void *data, netadr_t to)
{
int ret;
struct sockaddr_in addr;
NetadrToSockadr (&to, &addr);
#ifdef PACKET_LOGGING
Log_Outgoing_Packet(data,length);
#endif
ret =
sendto (net_socket, data, length, 0, (struct sockaddr *) &addr,
sizeof (addr));
if (ret == -1) {
#ifdef _WIN32
int err = WSAGetLastError ();
if (err == WSAEADDRNOTAVAIL) {
if (is_server)
Con_DPrintf ("NET_SendPacket Warning: %i\n", err);
else
Con_Printf ("NET_SendPacket ERROR: %i\n", err);
}
#else /* _WIN32 */
int err = errno;
if (err == ECONNREFUSED)
return;
#endif /* _WIN32 */
if (err == EWOULDBLOCK)
return;
Sys_Printf ("NET_SendPacket: %s\n", strerror (errno));
}
}
//=============================================================================
int
UDP_OpenSocket (int port)
{
int newsocket;
struct sockaddr_in address;
#ifdef _WIN32
#define ioctl ioctlsocket
unsigned long _true = true;
#else
int _true = 1;
#endif
int i;
memset (&address, 0, sizeof(address));
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
Sys_Error ("UDP_OpenSocket: socket:%s", strerror (errno));
if (ioctl (newsocket, FIONBIO, &_true) == -1)
Sys_Error ("UDP_OpenSocket: ioctl FIONBIO:%s", 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;
socklen_t 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: %s", 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)
{
#ifdef _WIN32
WORD wVersionRequested;
int r;
wVersionRequested = MAKEWORD (1, 1);
r = WSAStartup (MAKEWORD (1, 1), &winsockdata);
if (r)
Sys_Error ("Winsock initialization failed.");
#endif /* _WIN32 */
//
// open the single socket to be used for all communications
//
net_socket = UDP_OpenSocket (port);
//
// init the message buffer
//
_net_message_message.maxsize = sizeof (net_message_buffer);
_net_message_message.data = net_message_buffer;
//
// determine my name & address
//
NET_GetLocalAddress ();
Con_Printf ("UDP Initialized\n");
}
/*
NET_Shutdown
*/
void
NET_Shutdown (void)
{
#ifdef _WIN32
closesocket (net_socket);
WSACleanup ();
#else
close (net_socket);
#endif
}
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