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