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
|
/* copyright (c) 2007 magnus auvinen, see licence.txt for more info */
#include <string.h>
extern "C" {
#include <engine/system.h>
#include <engine/network.h>
}
#include "mastersrv.h"
enum {
MTU = 1400,
EXPIRE_TIME = 90
};
static struct check_server
{
NETADDR4 address;
int try_count;
int64 try_time;
} check_servers[MAX_SERVERS];
static int num_checkservers = 0;
static struct packet_data
{
unsigned char header[sizeof(SERVERBROWSE_LIST)];
NETADDR4 servers[MAX_SERVERS];
} data;
static int64 server_expire[MAX_SERVERS];
static int num_servers = 0;
static net_client net_checker; // NAT/FW checker
static net_client net_op; // main
void send_ok(NETADDR4 *addr)
{
NETPACKET p;
p.client_id = -1;
p.address = *addr;
p.flags = PACKETFLAG_CONNLESS;
p.data_size = sizeof(SERVERBROWSE_FWOK);
p.data = SERVERBROWSE_FWOK;
net_op.send(&p);
}
void send_error(NETADDR4 *addr)
{
NETPACKET p;
p.client_id = -1;
p.address = *addr;
p.flags = PACKETFLAG_CONNLESS;
p.data_size = sizeof(SERVERBROWSE_FWERROR);
p.data = SERVERBROWSE_FWERROR;
net_op.send(&p);
}
void send_check(NETADDR4 *addr)
{
NETPACKET p;
p.client_id = -1;
p.address = *addr;
p.flags = PACKETFLAG_CONNLESS;
p.data_size = sizeof(SERVERBROWSE_FWCHECK);
p.data = SERVERBROWSE_FWCHECK;
net_checker.send(&p);
}
void add_checkserver(NETADDR4 *info)
{
// add server
if(num_checkservers == MAX_SERVERS)
{
dbg_msg("mastersrv", "error: mastersrv is full");
return;
}
dbg_msg("mastersrv", "checking: %d.%d.%d.%d:%d",
info->ip[0], info->ip[1], info->ip[2], info->ip[3], info->port);
check_servers[num_checkservers].address = *info;
check_servers[num_checkservers].try_count = 0;
check_servers[num_checkservers].try_time = 0;
num_checkservers++;
}
void add_server(NETADDR4 *info)
{
// see if server already exists in list
int i;
for(i = 0; i < num_servers; i++)
{
if(net_addr4_cmp(&data.servers[i], info) == 0)
{
dbg_msg("mastersrv", "updated: %d.%d.%d.%d:%d",
info->ip[0], info->ip[1], info->ip[2], info->ip[3], info->port);
server_expire[i] = time_get()+time_freq()*EXPIRE_TIME;
return;
}
}
// add server
if(num_servers == MAX_SERVERS)
{
dbg_msg("mastersrv", "error: mastersrv is full");
return;
}
dbg_msg("mastersrv", "added: %d.%d.%d.%d:%d",
info->ip[0], info->ip[1], info->ip[2], info->ip[3], info->port);
data.servers[num_servers] = *info;
server_expire[num_servers] = time_get()+time_freq()*EXPIRE_TIME;
num_servers++;
}
void update_servers()
{
int64 now = time_get();
int64 freq = time_freq();
for(int i = 0; i < num_checkservers; i++)
{
if(now > check_servers[i].try_time+freq)
{
if(check_servers[i].try_count == 5)
{
dbg_msg("mastersrv", "check failed: %d.%d.%d.%d:%d",
check_servers[i].address.ip[0], check_servers[i].address.ip[1],
check_servers[i].address.ip[2], check_servers[i].address.ip[3],check_servers[i].address.port);
// FAIL!!
send_error(&check_servers[i].address);
check_servers[i] = check_servers[num_checkservers-1];
num_checkservers--;
i--;
}
else
{
check_servers[i].try_count++;
check_servers[i].try_time = now;
send_check(&check_servers[i].address);
}
}
}
}
void purge_servers()
{
int64 now = time_get();
int i = 0;
while(i < num_servers)
{
if(server_expire[i] < now)
{
// remove server
dbg_msg("mastersrv", "expired: %d.%d.%d.%d:%d",
data.servers[i].ip[0], data.servers[i].ip[1],
data.servers[i].ip[2], data.servers[i].ip[3], data.servers[i].port);
data.servers[i] = data.servers[num_servers-1];
server_expire[i] = server_expire[num_servers-1];
num_servers--;
}
else
i++;
}
}
int main(int argc, char **argv)
{
NETADDR4 bindaddr;
mem_zero(&bindaddr, sizeof(bindaddr));
bindaddr.port = MASTERSERVER_PORT;
net_op.open(bindaddr, 0);
bindaddr.port = MASTERSERVER_PORT+1;
net_checker.open(bindaddr, 0);
// TODO: check socket for errors
mem_copy(data.header, SERVERBROWSE_LIST, sizeof(SERVERBROWSE_LIST));
dbg_msg("mastersrv", "started");
while(1)
{
net_op.update();
net_checker.update();
// process packets
NETPACKET packet;
while(net_op.recv(&packet))
{
if(packet.data_size == sizeof(SERVERBROWSE_HEARTBEAT) &&
memcmp(packet.data, SERVERBROWSE_HEARTBEAT, sizeof(SERVERBROWSE_HEARTBEAT)) == 0)
{
// add it
add_checkserver(&packet.address);
}
else if(packet.data_size == sizeof(SERVERBROWSE_GETLIST) &&
memcmp(packet.data, SERVERBROWSE_GETLIST, sizeof(SERVERBROWSE_GETLIST)) == 0)
{
// someone requested the list
dbg_msg("mastersrv", "requested, responding with %d servers", num_servers);
NETPACKET p;
p.client_id = -1;
p.address = packet.address;
p.flags = PACKETFLAG_CONNLESS;
p.data_size = num_servers*sizeof(NETADDR4)+sizeof(SERVERBROWSE_LIST);
p.data = &data;
net_op.send(&p);
}
}
// process packets
while(net_checker.recv(&packet))
{
if(packet.data_size == sizeof(SERVERBROWSE_FWRESPONSE) &&
memcmp(packet.data, SERVERBROWSE_FWRESPONSE, sizeof(SERVERBROWSE_FWRESPONSE)) == 0)
{
// remove it from checking
for(int i = 0; i < num_checkservers; i++)
{
if(net_addr4_cmp(&check_servers[i].address, &packet.address) == 0)
{
num_checkservers--;
check_servers[i] = check_servers[num_checkservers];
break;
}
}
add_server(&packet.address);
send_ok(&packet.address);
}
}
// TODO: shouldn't be done every fuckin frame
purge_servers();
update_servers();
// be nice to the CPU
thread_sleep(1);
}
return 0;
}
|