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 #include <sys/types.h>
  24 #include <unistd.h>
  25 #include <stdlib.h>
  26 #include <sys/socket.h>
  27 #include <netinet/in.h>
  28 #include <netdb.h>
  29 #include <string.h>
  30 #include <errno.h>
  31
  32 #define HEADER_SIZE sizeof(netint2[2])
  33 #define HEADER_SIZE3 sizeof(netint4[3])
  34
  35 ExtFunc MyEventType NetGenFunc(EventGenRec *gen, MyEvent *event);
  36 EventGenRec netGen =
  37         { NULL, 0, FT_read, -1, NetGenFunc, EM_net, 0, "\0", 0, HEADER_SIZE3 };
  38
  39
  40 ExtFunc int InitiateConnection(char *hostStr, short port)
  41 { //connect to host
  42         struct sockaddr_in addr;
  43         struct hostent *host;
  44
  45         AtExit(CloseNet);
  46         host = gethostbyname(hostStr);
  47         if (!host)
  48                 die("gethostbyname");
  49         assert(host->h_addrtype == AF_INET);
  50  again:
  51         memset(&addr, 0, sizeof(addr));
  52         addr.sin_family = host->h_addrtype;
  53         memcpy(&addr.sin_addr, host->h_addr, host->h_length);
  54         addr.sin_port = htons(port);
  55         if ((netGen.fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
  56                 die("socket");
  57         if (connect(netGen.fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
  58                 if (errno != ECONNREFUSED)
  59                         die("connect");
  60                 close(netGen.fd);
  61                 sleep(1);
  62                 goto again;
  63         }
  64         AddEventGen(&netGen);
  65         return 0;
  66 } //InitiateConnection
  67
  68 ExtFunc void HandShake(void)
  69 { //talk to your host
  70         MyEvent event;
  71
  72         {
  73                 netint4 versiondata[2];
  74                 versiondata[0] = hton4(MAJOR_VERSION);
  75                 versiondata[1] = hton4(PROTOCOL_VERSION);
  76                 SendPacket(0, NP_hello, sizeof(versiondata), versiondata);
  77         }
  78
  79         do {
  80                 if (WaitMyEvent(&event, EM_net) == E_net)
  81                 switch (event.u.net.type) {
  82                         case NP_hello:
  83                         {
  84                                 me = event.u.net.uid;
  85                                 memcpy(&Players[me], &Players[0], sizeof(Player));
  86                                 fprintf(stderr, "Accepted (%s) as #%d (%s)\n",
  87                                         event.u.net.data, me, Players[me].name);
  88                                 SendPacket(0, NP_newPlayer,
  89                                         sizeof(Player) - sizeof(Players[me].host)
  90                                         - sizeof(Players[me].spy) - sizeof(Players[me].small),
  91                                         &Players[me]);
  92                                 break;
  93                         }
  94                         case NP_gamedata:
  95                         {
  96                                 static struct {
  97                                         int playerflags;
  98                                         int maxplayers; //1
  99                                         int started;    //2
 100                                         int continuous; //3
 101                                         long seed;              //4
 102                                         int initspeed;  //5
 103                                 } data;
 104
 105                                 memcpy(&data, event.u.net.data, event.u.net.size);
 106                                 memcpy(&Players[me].flags, &data, sizeof(data.playerflags));
 107                                 memcpy(&Game, &data.maxplayers,
 108                                         sizeof(data) - sizeof(data.playerflags));
 109                                 SRandom(Game.seed);
 110                                 break;
 111                         }
 112                         case NP_error:
 113                         {
 114                                 fprintf(stderr, "Rejected by server: %s\n", event.u.net.data);
 115                                 exit(1);
 116                         }
 117                         default:
 118                                 break;
 119                 }
 120                 else
 121                         fatal("Hm, the party apparantly ended prematurely.");
 122         }
 123         while (event.u.net.type != NP_gamedata);
 124 } //HandShake
 125
 126 ExtFunc void CheckNetConn(void)
 127 { //am I necessary?
 128 }
 129
 130
 131 ExtFunc MyEventType NetGenFunc(EventGenRec *gen, MyEvent *event)
 132 { //receive
 133         int result;
 134         short uid, type, size;
 135         netint4 *data = (netint4*)&(gen->buf);
 136
 137         result = MyRead(gen->fd, gen->buf + gen->bufSize,
 138                 gen->bufGoal - gen->bufSize);
 139         if (result < 0) {
 140                 close(gen->fd);
 141                 gen->fd = -1;
 142                 return E_lostConn;
 143         }
 144         gen->bufSize += result;
 145         if (gen->bufSize < gen->bufGoal)
 146                 return E_none;
 147         // *ugly* memcpy(data, gen->buf, sizeof(data));
 148         uid = ntoh4(data[0]);
 149         type = ntoh4(data[1]);
 150         size = ntoh4(data[2]);
 151         gen->bufGoal = size;
 152         if (gen->bufSize < gen->bufGoal)
 153                 return E_none;
 154         gen->bufSize = 0;
 155         gen->bufGoal = HEADER_SIZE3;
 156         event->u.net.sender = gen->player;
 157         event->u.net.uid = uid;
 158         event->u.net.type = type;
 159         event->u.net.size = size - HEADER_SIZE3;
 160         event->u.net.data = gen->buf + HEADER_SIZE3;
 161         if (type == NP_endConn) return E_lostConn;
 162         return E_net;
 163 } //NetGenFunc
 164
 165 ExtFunc void SendPacket(short uid, NetPacketType type, int size, void *data)
 166 { //send shit to server
 167         netint4 header[3];
 168
 169         header[0] = hton4(uid);
 170         header[1] = hton4(type);
 171         header[2] = hton4(size + HEADER_SIZE3);
 172         if (MyWrite(netGen.fd, header, HEADER_SIZE3) != HEADER_SIZE3)
 173                 die("write (header)");
 174         if (size > 0 && data && MyWrite(netGen.fd, data, size) != size)
 175                 die("write");
 176 } //SendPacket
 177
 178 ExtFunc void CloseNet(void)
 179 { //kick some connection's ass!
 180         MyEvent event;
 181
 182         if (netGen.fd >= 0) {
 183                 SendPacket(0, NP_endConn, 0, NULL);
 184                 close(netGen.fd);
 185                 netGen.fd = -1;
 186         }
 187         if (netGen.next)
 188                 RemoveEventGen(&netGen);
 189 } //CloseNet
 190
 191 /*
 192  * vi: ts=4 ai
 193  * vim: noai si
 194  */