git.zerfleddert.de Git - micropolis/blob - src/sim/w_net.c

   1 /* w_net.c
   2  *
   3  * Micropolis, Unix Version.  This game was released for the Unix platform
   4  * in or about 1990 and has been modified for inclusion in the One Laptop
   5  * Per Child program.  Copyright (C) 1989 - 2007 Electronic Arts Inc.  If
   6  * you need assistance with this program, you may contact:
   7  *   http://wiki.laptop.org/go/Micropolis  or email  micropolis@laptop.org.
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation, either version 3 of the License, or (at
  12  * your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.  You should have received a
  18  * copy of the GNU General Public License along with this program.  If
  19  * not, see <http://www.gnu.org/licenses/>.
  20  *
  21  *             ADDITIONAL TERMS per GNU GPL Section 7
  22  *
  23  * No trademark or publicity rights are granted.  This license does NOT
  24  * give you any right, title or interest in the trademark SimCity or any
  25  * other Electronic Arts trademark.  You may not distribute any
  26  * modification of this program using the trademark SimCity or claim any
  27  * affliation or association with Electronic Arts Inc. or its employees.
  28  *
  29  * Any propagation or conveyance of this program must include this
  30  * copyright notice and these terms.
  31  *
  32  * If you convey this program (or any modifications of it) and assume
  33  * contractual liability for the program to recipients of it, you agree
  34  * to indemnify Electronic Arts for any liability that those contractual
  35  * assumptions impose on Electronic Arts.
  36  *
  37  * You may not misrepresent the origins of this program; modified
  38  * versions of the program must be marked as such and not identified as
  39  * the original program.
  40  *
  41  * This disclaimer supplements the one included in the General Public
  42  * License.  TO THE FULLEST EXTENT PERMISSIBLE UNDER APPLICABLE LAW, THIS
  43  * PROGRAM IS PROVIDED TO YOU "AS IS," WITH ALL FAULTS, WITHOUT WARRANTY
  44  * OF ANY KIND, AND YOUR USE IS AT YOUR SOLE RISK.  THE ENTIRE RISK OF
  45  * SATISFACTORY QUALITY AND PERFORMANCE RESIDES WITH YOU.  ELECTRONIC ARTS
  46  * DISCLAIMS ANY AND ALL EXPRESS, IMPLIED OR STATUTORY WARRANTIES,
  47  * INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, SATISFACTORY QUALITY,
  48  * FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT OF THIRD PARTY
  49  * RIGHTS, AND WARRANTIES (IF ANY) ARISING FROM A COURSE OF DEALING,
  50  * USAGE, OR TRADE PRACTICE.  ELECTRONIC ARTS DOES NOT WARRANT AGAINST
  51  * INTERFERENCE WITH YOUR ENJOYMENT OF THE PROGRAM; THAT THE PROGRAM WILL
  52  * MEET YOUR REQUIREMENTS; THAT OPERATION OF THE PROGRAM WILL BE
  53  * UNINTERRUPTED OR ERROR-FREE, OR THAT THE PROGRAM WILL BE COMPATIBLE
  54  * WITH THIRD PARTY SOFTWARE OR THAT ANY ERRORS IN THE PROGRAM WILL BE
  55  * CORRECTED.  NO ORAL OR WRITTEN ADVICE PROVIDED BY ELECTRONIC ARTS OR
  56  * ANY AUTHORIZED REPRESENTATIVE SHALL CREATE A WARRANTY.  SOME
  57  * JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF OR LIMITATIONS ON IMPLIED
  58  * WARRANTIES OR THE LIMITATIONS ON THE APPLICABLE STATUTORY RIGHTS OF A
  59  * CONSUMER, SO SOME OR ALL OF THE ABOVE EXCLUSIONS AND LIMITATIONS MAY
  60  * NOT APPLY TO YOU.
  61  */
  62 #include "sim.h"
  63
  64
  65 #ifdef NET
  66
  67
  68 #define NET_BUFFER_SIZE 1024
  69
  70
  71 int net_listen_port;
  72 int net_listen_socket;
  73
  74
  75 int
  76 udp_listen(int port)
  77 {
  78   struct sockaddr_in addr;
  79   int flags;
  80
  81   net_listen_port = port;
  82
  83   net_listen_socket = socket(AF_INET, SOCK_DGRAM, 0);
  84   if (net_listen_socket < 0) {
  85     perror("socket()");
  86     return 0;
  87   }
  88
  89   flags = 1;
  90   if (setsockopt(net_listen_socket, SOL_SOCKET, SO_REUSEADDR,
  91                  (char *)&flags, sizeof(flags)) == -1) {
  92     perror("setsockopt SO_REUSEADDR");
  93     return 0;
  94   }
  95
  96   addr.sin_family = AF_INET;
  97   addr.sin_port = net_listen_port;
  98   addr.sin_addr.s_addr = INADDR_ANY;
  99
 100   if (bind(net_listen_socket, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 101     perror("bind()");
 102     return 0;
 103   }
 104
 105   if ((flags = fcntl(net_listen_socket, F_GETFL)) < 0) {
 106     perror("fcntl F_GETFL");
 107     return 0;
 108   }
 109
 110   if (fcntl(net_listen_socket, F_SETFL, flags|O_NDELAY) < 0) {
 111     perror("fcntl F_SETFL");
 112     return 0;
 113   }
 114
 115   Tcp_MakeOpenFile(tk_mainInterp, net_listen_socket, 1, 1);
 116
 117   return (net_listen_socket);
 118 }
 119
 120
 121 udp_hear(int sock)
 122 {
 123   struct sockaddr_in addr;
 124   int addr_len;
 125   int len, i;
 126   unsigned char buf[NET_BUFFER_SIZE];
 127   char cmd[NET_BUFFER_SIZE * 4 + 256];
 128   char *cp;
 129
 130   while (1) {
 131     len = recvfrom(sock, buf, NET_BUFFER_SIZE, 0,
 132                    (struct sockaddr *)&addr, &addr_len);
 133
 134     if (len < 0) {
 135       if (errno == EINTR) continue;
 136       if (errno == EWOULDBLOCK) break;
 137       perror("recvfrom");
 138       return;
 139     }
 140
 141     sprintf(cmd, "HandlePacket %d {%s} {", sock, inet_ntoa(addr.sin_addr));
 142
 143     cp = cmd + strlen(cmd);
 144     for (i = 0; i < len; i++) {
 145       sprintf(cp, "%3d ", buf[i]);
 146       cp += 4;
 147     }
 148     sprintf(cp, "}");
 149     Eval(cmd);
 150   }
 151 }
 152
 153
 154 #endif