summaryrefslogtreecommitdiff
path: root/src/modules/m_connflood.cpp
blob: 32d36188b3ec26abe63f85c949288812d83301f4 (plain)
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
/*
 * 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"

class ModuleConnFlood : public Module
{
	unsigned int seconds;
	unsigned int timeout;
	unsigned int boot_wait;
	unsigned int conns;
	unsigned int maxconns;
	bool throttled;
	time_t first;
	std::string quitmsg;

public:
	ModuleConnFlood()
		: conns(0), throttled(false)
	{
	}

	Version GetVersion() CXX11_OVERRIDE
	{
		return Version("Connection throttle", VF_VENDOR);
	}

	void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
	{
		/* read configuration variables */
		ConfigTag* tag = ServerInstance->Config->ConfValue("connflood");
		/* throttle configuration */
		seconds = tag->getDuration("period", tag->getDuration("seconds", 30));
		maxconns = tag->getInt("maxconns", 3);
		timeout = tag->getDuration("timeout", 30);
		quitmsg = tag->getString("quitmsg");

		/* seconds to wait when the server just booted */
		boot_wait = tag->getDuration("bootwait", 10);

		first = ServerInstance->Time();
	}

	ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE
	{
		if (user->exempt)
			return MOD_RES_PASSTHRU;

		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)
		{
			if (tdiff > seconds + timeout)
			{
				/* expire throttle */
				throttled = false;
				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 = true;
				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;
	}
};

MODULE_INIT(ModuleConnFlood)