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Annotation of micropolis/src/sim/w_net.c, revision 1.1

1.1     ! root        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  [email protected].
        !             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

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