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
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2006 Craig Edwards <craigedwards@brainbox.cc>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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 "inspircd.h"
/* $ModDesc: Connection throttle */
int conns = 0, throttled = 0;
class ModuleConnFlood : public Module
{
private:
int seconds, maxconns, timeout, boot_wait;
time_t first;
std::string quitmsg;
public:
ModuleConnFlood() {
InitConf();
Implementation eventlist[] = { I_OnRehash, I_OnUserRegister };
ServerInstance->Modules->Attach(eventlist, this, 2);
}
virtual ~ModuleConnFlood()
{
}
virtual Version GetVersion()
{
return Version("Connection throttle", VF_VENDOR);
}
void InitConf()
{
/* read configuration variables */
ConfigReader conf;
/* throttle configuration */
seconds = conf.ReadInteger("connflood", "seconds", 0, true);
maxconns = conf.ReadInteger("connflood", "maxconns", 0, true);
timeout = conf.ReadInteger("connflood", "timeout", 0, true);
quitmsg = conf.ReadValue("connflood", "quitmsg", 0);
/* seconds to wait when the server just booted */
boot_wait = conf.ReadInteger("connflood", "bootwait", 0, true);
first = ServerInstance->Time();
}
virtual ModResult OnUserRegister(LocalUser* user)
{
time_t next = ServerInstance->Time();
if ((ServerInstance->startup_time + boot_wait) > next)
return MOD_RES_PASSTHRU;
/* time difference between first and latest connection */
time_t tdiff = next - first;
/* increase connection count */
conns++;
if (throttled == 1)
{
if (tdiff > seconds + timeout)
{
/* expire throttle */
throttled = 0;
ServerInstance->SNO->WriteGlobalSno('a', "Connection throttle deactivated");
return MOD_RES_PASSTHRU;
}
ServerInstance->Users->QuitUser(user, quitmsg);
return MOD_RES_DENY;
}
if (tdiff <= seconds)
{
if (conns >= maxconns)
{
throttled = 1;
ServerInstance->SNO->WriteGlobalSno('a', "Connection throttle activated");
ServerInstance->Users->QuitUser(user, quitmsg);
return MOD_RES_DENY;
}
}
else
{
conns = 1;
first = next;
}
return MOD_RES_PASSTHRU;
}
virtual void OnRehash(User* user)
{
InitConf();
}
};
MODULE_INIT(ModuleConnFlood)
|
