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
|
/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2009, Jan Vidar Krey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "uhub.h"
int route_message(struct hub_info* hub, struct hub_user* u, struct adc_message* msg)
{
struct hub_user* target = NULL;
switch (msg->cache[0])
{
case 'B': /* Broadcast to all logged in clients */
route_to_all(hub, msg);
break;
case 'D':
target = uman_get_user_by_sid(hub->users, msg->target);
if (target)
{
route_to_user(hub, target, msg);
}
break;
case 'E':
target = uman_get_user_by_sid(hub->users, msg->target);
if (target)
{
route_to_user(hub, target, msg);
route_to_user(hub, u, msg);
}
break;
case 'F':
route_to_subscribers(hub, msg);
break;
default:
/* Ignore the message */
break;
}
return 0;
}
static size_t get_max_send_queue(struct hub_info* hub)
{
/* TODO: More dynamic send queue limit, for instance:
* return MAX(hub->config->max_send_buffer, (hub->config->max_recv_buffer * hub_get_user_count(hub)));
*/
return hub->config->max_send_buffer;
}
static size_t get_max_send_queue_soft(struct hub_info* hub)
{
return hub->config->max_send_buffer_soft;
}
/*
* @return 1 if send queue is OK.
* -1 if send queue is overflowed
* 0 if soft send queue is overflowed (not implemented at the moment)
*/
static int check_send_queue(struct hub_info* hub, struct hub_user* user, struct adc_message* msg)
{
if (user_flag_get(user, flag_user_list))
return 1;
if ((user->send_queue->size + msg->length) > get_max_send_queue(hub))
{
LOG_WARN("send queue overflowed, message discarded.");
return -1;
}
if (user->send_queue->size > get_max_send_queue_soft(hub))
{
LOG_WARN("send queue soft overflowed.");
return 0;
}
return 1;
}
int route_to_user(struct hub_info* hub, struct hub_user* user, struct adc_message* msg)
{
#ifdef DEBUG_SENDQ
char* data = strndup(msg->cache, msg->length-1);
LOG_PROTO("send %s: \"%s\"", sid_to_string(user->id.sid), data);
free(data);
#endif
if (!user->connection)
return 0;
uhub_assert(msg->cache && *msg->cache);
if (ioq_send_is_empty(user->send_queue) && !user_flag_get(user, flag_pipeline))
{
/* Perform oportunistic write */
ioq_send_add(user->send_queue, msg);
handle_net_write(user);
}
else
{
if (check_send_queue(hub, user, msg) >= 0)
{
ioq_send_add(user->send_queue, msg);
if (!user_flag_get(user, flag_pipeline))
user_net_io_want_write(user);
}
}
return 1;
}
int route_flush_pipeline(struct hub_info* hub, struct hub_user* u)
{
if (ioq_send_is_empty(u->send_queue))
return 0;
handle_net_write(u);
user_flag_unset(u, flag_pipeline);
return 1;
}
int route_to_all(struct hub_info* hub, struct adc_message* command) /* iterate users */
{
struct hub_user* user = (struct hub_user*) list_get_first(hub->users->list);
while (user)
{
route_to_user(hub, user, command);
user = (struct hub_user*) list_get_next(hub->users->list);
}
return 0;
}
int route_to_subscribers(struct hub_info* hub, struct adc_message* command) /* iterate users */
{
int do_send;
char* tmp;
struct hub_user* user = (struct hub_user*) list_get_first(hub->users->list);
while (user)
{
if (user->feature_cast)
{
do_send = 1;
tmp = list_get_first(command->feature_cast_include);
while (tmp)
{
if (!user_have_feature_cast_support(user, tmp))
{
do_send = 0;
break;
}
tmp = list_get_next(command->feature_cast_include);;
}
if (!do_send) {
user = (struct hub_user*) list_get_next(hub->users->list);
continue;
}
tmp = list_get_first(command->feature_cast_exclude);
while (tmp)
{
if (user_have_feature_cast_support(user, tmp))
{
do_send = 0;
break;
}
tmp = list_get_next(command->feature_cast_exclude);
}
if (do_send)
{
route_to_user(hub, user, command);
}
}
user = (struct hub_user*) list_get_next(hub->users->list);
}
return 0;
}
int route_info_message(struct hub_info* hub, struct hub_user* u)
{
if (!user_is_nat_override(u))
{
return route_to_all(hub, u->info);
}
else
{
struct adc_message* cmd = adc_msg_copy(u->info);
const char* address = user_get_address(u);
struct hub_user* user = 0;
adc_msg_remove_named_argument(cmd, ADC_INF_FLAG_IPV4_ADDR);
adc_msg_add_named_argument(cmd, ADC_INF_FLAG_IPV4_ADDR, address);
user = (struct hub_user*) list_get_first(hub->users->list);
while (user)
{
if (user_is_nat_override(user))
route_to_user(hub, user, cmd);
else
route_to_user(hub, user, u->info);
user = (struct hub_user*) list_get_next(hub->users->list);
}
adc_msg_free(cmd);
}
return 0;
}
|