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[micropolis] / 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
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