inet.c

   1 /*
   2  * Netris -- A free networked version of T*tris
   3  * Copyright (C) 1994,1995,1996  Mark H. Weaver <mhw@netris.org>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * $Id: inet.c,v 1.18 1996/02/09 08:22:13 mhw Exp $
  20  */
  21
  22 #include "netris.h"
  23
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <netdb.h>
  30 #include <string.h>
  31 #include <errno.h>
  32 #include <setjmp.h>
  33
  34 #include "inet.h"
  35
  36 #define HEADER_SIZE sizeof(netint2[2])
  37 #define HEADER_SIZE3 sizeof(netint4[3])
  38
  39 MyEventType NetGenFunc(EventGenRec *gen, MyEvent *event);
  40 EventGenRec netGen =
  41         { NULL, 0, FT_read, -1, NetGenFunc, EM_net, 0, "\0", 0, HEADER_SIZE3 };
  42
  43
  44 static sigjmp_buf close_env;
  45
  46 void CatchInt(int sig)
  47 {
  48         siglongjmp(close_env, 1);
  49 }
  50
  51 int InitiateConnection(char *hostStr, short port)
  52 { //connect to host
  53         struct sockaddr_in addr;
  54         struct hostent *host;
  55
  56         if (sigsetjmp(close_env, 1))
  57                 exit(0);
  58         signal(SIGINT, CatchInt);  //handle exit (^C)
  59         AtExit(CloseNet);
  60         host = gethostbyname(hostStr);
  61         if (!host)
  62                 die("gethostbyname");
  63         assert(host->h_addrtype == AF_INET);
  64  again:
  65         memset(&addr, 0, sizeof(addr));
  66         addr.sin_family = host->h_addrtype;
  67         memcpy(&addr.sin_addr, host->h_addr, host->h_length);
  68         addr.sin_port = htons(port);
  69         if ((netGen.fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
  70                 die("socket");
  71         if (connect(netGen.fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
  72                 if (errno != ECONNREFUSED)
  73                         die("connect");
  74                 close(netGen.fd);
  75                 sleep(1);
  76                 goto again;
  77         }
  78         AddEventGen(&netGen);
  79         return 0;
  80 }
  81
  82 void HandShake(void)
  83 { //talk to your host
  84         MyEvent event;
  85
  86         {
  87                 netint4 versiondata[2];
  88                 versiondata[0] = hton4(MAJOR_VERSION);
  89                 versiondata[1] = hton4(PROTOCOL_VERSION);
  90                 SendPacket(0, NP_hello, sizeof(versiondata), versiondata);
  91         }
  92
  93         do {
  94                 if (WaitMyEvent(&event, EM_net) == E_net)
  95                         switch (event.u.net.type) {
  96                         case NP_hello:
  97                         {
  98                                 me = event.u.net.uid;
  99                                 memcpy(&Players[me], &Players[0], sizeof(_Player));
 100                                 fprintf(stderr, "Accepted (%s) as #%d (%s)\n",
 101                                         event.u.net.data, me, Players[me].name);
 102                                 SendPacket(0, NP_newPlayer,
 103                                         sizeof(_Player) - sizeof(Players[me].host),
 104                                         &Players[me]);
 105                                 break;
 106                         }
 107                         case NP_team:
 108                         { //receive your teamnumber
 109                                 memcpy(&Players[event.u.net.uid].team, event.u.net.data,
 110                                         event.u.net.size);
 111                                 break;
 112                         } //NP_team
 113                         case NP_gamedata:
 114                         {
 115                                 static struct {
 116                                         int playerflags;
 117                                         int maxplayers;  //1
 118                                         int started;     //2
 119                                         int continuous;  //3
 120                                         long seed;       //4
 121                                         int initspeed;   //5
 122                                 } data;
 123
 124                                 memcpy(&data, event.u.net.data, event.u.net.size);
 125                                 memcpy(&Players[me].flags, &data, sizeof(data.playerflags));
 126                                 memcpy(&Players[me].flags, &data, sizeof(data.playerflags));
 127                                 memcpy(&Game, &data.maxplayers,
 128                                         sizeof(data) - sizeof(data.playerflags));
 129                                 break;
 130                         } //NP_gamedata
 131                         case NP_error:
 132                         {
 133                                 fprintf(stderr, "Rejected by server: %s\n", event.u.net.data);
 134                                 exit(1);
 135                         } //NP_error
 136                         default:
 137                                 break;
 138                         }
 139                 else
 140                         fatal("Hm, the party apparantly ended prematurely.");
 141         }
 142         while (event.u.net.type != NP_gamedata);
 143 }
 144
 145
 146 MyEventType NetGenFunc(EventGenRec *gen, MyEvent *event)
 147 { //receive
 148         int result;
 149         short uid, type, size;
 150         netint4 *data = (netint4*)&(gen->buf);
 151
 152         result = MyRead(gen->fd, gen->buf + gen->bufSize,
 153                 gen->bufGoal - gen->bufSize);
 154         if (result < 0) {
 155                 close(gen->fd);
 156                 gen->fd = -1;
 157                 return E_lostConn;
 158         }
 159         gen->bufSize += result;
 160         if (gen->bufSize < gen->bufGoal)
 161                 return E_none;
 162         // *ugly* memcpy(data, gen->buf, sizeof(data));
 163         uid = ntoh4(data[0]);
 164         type = ntoh4(data[1]);
 165         size = ntoh4(data[2]);
 166         gen->bufGoal = size;
 167         if (gen->bufSize < gen->bufGoal)
 168                 return E_none;
 169         gen->bufSize = 0;
 170         gen->bufGoal = HEADER_SIZE3;
 171         event->u.net.sender = gen->player;
 172         event->u.net.uid = uid;
 173         event->u.net.type = type;
 174         event->u.net.size = size - HEADER_SIZE3;
 175         event->u.net.data = gen->buf + HEADER_SIZE3;
 176         if (type == NP_endConn) return E_lostConn;
 177         return E_net;
 178 }
 179
 180 void SendPacket(short uid, NetPacketType type, int size, void *data)
 181 { //send shit to server
 182         netint4 header[3];
 183
 184         header[0] = hton4(uid);
 185         header[1] = hton4(type);
 186         header[2] = hton4(size + HEADER_SIZE3);
 187         if (MyWrite(netGen.fd, header, HEADER_SIZE3) != HEADER_SIZE3)
 188                 die("write (header)");
 189         if (size > 0 && data && MyWrite(netGen.fd, data, size) != size)
 190                 die("write");
 191 }
 192
 193 void CloseNet(void)
 194 { //kick some connection's ass!
 195         MyEvent event;
 196
 197         if (netGen.fd >= 0) {
 198                 SendPacket(0, NP_endConn, 0, NULL);
 199                 close(netGen.fd);
 200                 netGen.fd = -1;
 201         }
 202         if (netGen.next)
 203                 RemoveEventGen(&netGen);
 204 }
 205
 206 /*
 207  * vi: ts=4 ai
 208  * vim: noai si
 209  */