1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
/* $Id$ */
#ifdef ENABLE_NETWORK
#include "../../stdafx.h"
#include "../../date.h"
#include "../../debug.h"
#include "../../macros.h"
#include "../../newgrf_config.h"
#include "os_abstraction.h"
#include "config.h"
#include "game.h"
#include "packet.h"
#include "udp.h"
/**
* @file udp.c Basic functions to receive and send UDP packets.
*/
/**
* Send a packet over UDP
* @param udp the socket to send over
* @param p the packet to send
* @param recv the receiver (target) of the packet
*/
void NetworkSendUDP_Packet(SOCKET udp, Packet *p, struct sockaddr_in *recv)
{
int res;
NetworkSend_FillPacketSize(p);
/* Send the buffer */
res = sendto(udp, p->buffer, p->size, 0, (struct sockaddr *)recv, sizeof(*recv));
/* Check for any errors, but ignore it otherwise */
if (res == -1) DEBUG(net, 1, "[udp] sendto failed with: %i", GET_LAST_ERROR());
}
/**
* Start listening on the given host and port.
* @param udp the place where the (references to the) UDP are stored
* @param host the host (ip) to listen on
* @param port the port to listen on
* @param broadcast whether to allow broadcast sending/receiving
* @return true if the listening succeeded
*/
bool NetworkUDPListen(SOCKET *udp, uint32 host, uint16 port, bool broadcast)
{
struct sockaddr_in sin;
/* Make sure socket is closed */
closesocket(*udp);
*udp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (*udp == INVALID_SOCKET) {
DEBUG(net, 0, "[udp] failed to start UDP listener");
return false;
}
/* set nonblocking mode for socket */
{
unsigned long blocking = 1;
#ifndef BEOS_NET_SERVER
ioctlsocket(*udp, FIONBIO, &blocking);
#else
setsockopt(*udp, SOL_SOCKET, SO_NONBLOCK, &blocking, NULL);
#endif
}
sin.sin_family = AF_INET;
/* Listen on all IPs */
sin.sin_addr.s_addr = host;
sin.sin_port = htons(port);
if (bind(*udp, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
DEBUG(net, 0, "[udp] bind failed on %s:%i", inet_ntoa(*(struct in_addr *)&host), port);
return false;
}
if (broadcast) {
/* Enable broadcast */
unsigned long val = 1;
#ifndef BEOS_NET_SERVER // will work around this, some day; maybe.
setsockopt(*udp, SOL_SOCKET, SO_BROADCAST, (char *) &val , sizeof(val));
#endif
}
DEBUG(net, 1, "[udp] listening on port %s:%d", inet_ntoa(*(struct in_addr *)&host), port);
return true;
}
/**
* Receive a packet at UDP level
* @param udp the socket to receive the packet on
*/
void NetworkUDPReceive(SOCKET udp)
{
struct sockaddr_in client_addr;
socklen_t client_len;
int nbytes;
Packet p;
int packet_len;
packet_len = sizeof(p.buffer);
client_len = sizeof(client_addr);
/* Try to receive anything */
nbytes = recvfrom(udp, p.buffer, packet_len, 0, (struct sockaddr *)&client_addr, &client_len);
/* We got some bytes for the base header of the packet.
* Assume we received the whole packet. */
if (nbytes > 2) {
NetworkRecv_ReadPacketSize(&p);
/* Put the position on the right place */
p.pos = 2;
p.next = NULL;
/* Handle the packet */
NetworkHandleUDPPacket(&p, &client_addr);
}
}
/**
* Serializes the GRFIdentifier (GRF ID and MD5 checksum) to the packet
* @param p the packet to write the data to
* @param c the configuration to write the GRF ID and MD5 checksum from
*/
void NetworkSend_GRFIdentifier(Packet *p, const GRFConfig *c)
{
uint j;
NetworkSend_uint32(p, c->grfid);
for (j = 0; j < sizeof(c->md5sum); j++) {
NetworkSend_uint8 (p, c->md5sum[j]);
}
}
/**
* Deserializes the GRFIdentifier (GRF ID and MD5 checksum) from the packet
* @param cs the client state (for closing connect on out-of-bounds reading etc)
* @param p the packet to read the data from
* @param c the configuration to write the GRF ID and MD5 checksum to
*/
void NetworkRecv_GRFIdentifier(NetworkClientState *cs, Packet *p, GRFConfig *c)
{
uint j;
c->grfid = NetworkRecv_uint32(cs, p);
for (j = 0; j < sizeof(c->md5sum); j++) {
c->md5sum[j] = NetworkRecv_uint8(cs, p);
}
}
/**
* Serializes the NetworkGameInfo struct to the packet
* @param p the packet to write the data to
* @param info the NetworkGameInfo struct to serialize
*/
void NetworkSend_NetworkGameInfo(Packet *p, const NetworkGameInfo *info)
{
NetworkSend_uint8 (p, NETWORK_GAME_INFO_VERSION);
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
/* NETWORK_GAME_INFO_VERSION = 4 */
{
/* Only send the GRF Identification (GRF_ID and MD5 checksum) of
* the GRFs that are needed, i.e. the ones that the server has
* selected in the NewGRF GUI and not the ones that are used due
* to the fact that they are in [newgrf-static] in openttd.cfg */
const GRFConfig *c;
uint count = 0;
/* Count number of GRFs to send information about */
for (c = info->grfconfig; c != NULL; c = c->next) {
if (!HASBIT(c->flags, GCF_STATIC)) count++;
}
NetworkSend_uint8 (p, count); // Send number of GRFs
/* Send actual GRF Identifications */
for (c = info->grfconfig; c != NULL; c = c->next) {
if (!HASBIT(c->flags, GCF_STATIC)) NetworkSend_GRFIdentifier(p, c);
}
}
/* NETWORK_GAME_INFO_VERSION = 3 */
NetworkSend_uint32(p, info->game_date);
NetworkSend_uint32(p, info->start_date);
/* NETWORK_GAME_INFO_VERSION = 2 */
NetworkSend_uint8 (p, info->companies_max);
NetworkSend_uint8 (p, info->companies_on);
NetworkSend_uint8 (p, info->spectators_max);
/* NETWORK_GAME_INFO_VERSION = 1 */
NetworkSend_string(p, info->server_name);
NetworkSend_string(p, info->server_revision);
NetworkSend_uint8 (p, info->server_lang);
NetworkSend_uint8 (p, info->use_password);
NetworkSend_uint8 (p, info->clients_max);
NetworkSend_uint8 (p, info->clients_on);
NetworkSend_uint8 (p, info->spectators_on);
NetworkSend_string(p, info->map_name);
NetworkSend_uint16(p, info->map_width);
NetworkSend_uint16(p, info->map_height);
NetworkSend_uint8 (p, info->map_set);
NetworkSend_uint8 (p, info->dedicated);
}
/**
* Deserializes the NetworkGameInfo struct from the packet
* @param cs the client state (for closing connect on out-of-bounds reading etc)
* @param p the packet to read the data from
* @param info the NetworkGameInfo to deserialize into
*/
void NetworkRecv_NetworkGameInfo(NetworkClientState *cs, Packet *p, NetworkGameInfo *info)
{
info->game_info_version = NetworkRecv_uint8(cs, p);
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
switch (info->game_info_version) {
case 4: {
GRFConfig *c, **dst = &info->grfconfig;
uint i;
uint num_grfs = NetworkRecv_uint8(cs, p);
for (i = 0; i < num_grfs; i++) {
c = calloc(1, sizeof(*c));
NetworkRecv_GRFIdentifier(cs, p, c);
HandleIncomingNetworkGameInfoGRFConfig(c);
/* Append GRFConfig to the list */
*dst = c;
dst = &c->next;
}
} /* Fallthrough */
case 3:
info->game_date = NetworkRecv_uint32(cs, p);
info->start_date = NetworkRecv_uint32(cs, p);
/* Fallthrough */
case 2:
info->companies_max = NetworkRecv_uint8 (cs, p);
info->companies_on = NetworkRecv_uint8 (cs, p);
info->spectators_max = NetworkRecv_uint8 (cs, p);
/* Fallthrough */
case 1:
NetworkRecv_string(cs, p, info->server_name, sizeof(info->server_name));
NetworkRecv_string(cs, p, info->server_revision, sizeof(info->server_revision));
info->server_lang = NetworkRecv_uint8 (cs, p);
info->use_password = NetworkRecv_uint8 (cs, p);
info->clients_max = NetworkRecv_uint8 (cs, p);
info->clients_on = NetworkRecv_uint8 (cs, p);
info->spectators_on = NetworkRecv_uint8 (cs, p);
if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
info->game_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
info->start_date = NetworkRecv_uint16(cs, p) + DAYS_TILL_ORIGINAL_BASE_YEAR;
}
NetworkRecv_string(cs, p, info->map_name, sizeof(info->map_name));
info->map_width = NetworkRecv_uint16(cs, p);
info->map_height = NetworkRecv_uint16(cs, p);
info->map_set = NetworkRecv_uint8 (cs, p);
info->dedicated = NetworkRecv_uint8 (cs, p);
}
}
#endif /* ENABLE_NETWORK */
|
