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
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2016-2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006-2007, 2010 Craig Edwards <brain@inspircd.org>
*
* 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"
#include "modules/server.h"
enum
{
// From RFC 2182.
ERR_UNAVAILRESOURCE = 437
};
// The number of seconds the channel will be closed for.
static unsigned int duration;
/** Holds settings and state associated with channel mode +j
*/
class joinfloodsettings
{
public:
unsigned int secs;
unsigned int joins;
time_t reset;
time_t unlocktime;
unsigned int counter;
joinfloodsettings(unsigned int b, unsigned int c)
: secs(b), joins(c), unlocktime(0), counter(0)
{
reset = ServerInstance->Time() + secs;
}
void addjoin()
{
if (ServerInstance->Time() > reset)
{
counter = 1;
reset = ServerInstance->Time() + secs;
}
else
counter++;
}
bool shouldlock()
{
return (counter >= this->joins);
}
void clear()
{
counter = 0;
}
bool islocked()
{
if (ServerInstance->Time() > unlocktime)
unlocktime = 0;
return (unlocktime != 0);
}
void lock()
{
unlocktime = ServerInstance->Time() + duration;
}
bool operator==(const joinfloodsettings& other) const
{
return ((this->secs == other.secs) && (this->joins == other.joins));
}
};
/** Handles channel mode +j
*/
class JoinFlood : public ParamMode<JoinFlood, SimpleExtItem<joinfloodsettings> >
{
public:
JoinFlood(Module* Creator)
: ParamMode<JoinFlood, SimpleExtItem<joinfloodsettings> >(Creator, "joinflood", 'j')
{
syntax = "<joins>:<seconds>";
}
ModeAction OnSet(User* source, Channel* channel, std::string& parameter) CXX11_OVERRIDE
{
std::string::size_type colon = parameter.find(':');
if ((colon == std::string::npos) || (parameter.find('-') != std::string::npos))
{
source->WriteNumeric(Numerics::InvalidModeParameter(channel, this, parameter));
return MODEACTION_DENY;
}
/* Set up the flood parameters for this channel */
unsigned int njoins = ConvToNum<unsigned int>(parameter.substr(0, colon));
unsigned int nsecs = ConvToNum<unsigned int>(parameter.substr(colon+1));
if ((njoins<1) || (nsecs<1))
{
source->WriteNumeric(Numerics::InvalidModeParameter(channel, this, parameter));
return MODEACTION_DENY;
}
ext.set(channel, new joinfloodsettings(nsecs, njoins));
return MODEACTION_ALLOW;
}
void SerializeParam(Channel* chan, const joinfloodsettings* jfs, std::string& out)
{
out.append(ConvToStr(jfs->joins)).push_back(':');
out.append(ConvToStr(jfs->secs));
}
};
class ModuleJoinFlood
: public Module
, public ServerProtocol::LinkEventListener
{
private:
JoinFlood jf;
time_t ignoreuntil;
unsigned long bootwait;
unsigned long splitwait;
public:
// Stop GCC warnings about the deprecated OnServerSplit event.
using ServerProtocol::LinkEventListener::OnServerSplit;
ModuleJoinFlood()
: ServerProtocol::LinkEventListener(this)
, jf(this)
, ignoreuntil(0)
{
}
void ReadConfig(ConfigStatus&) CXX11_OVERRIDE
{
ConfigTag* tag = ServerInstance->Config->ConfValue("joinflood");
duration = tag->getDuration("duration", 60, 10, 600);
bootwait = tag->getDuration("bootwait", 30);
splitwait = tag->getDuration("splitwait", 30);
ignoreuntil = ServerInstance->startup_time + bootwait;
}
void OnServerSplit(const Server* server, bool error) CXX11_OVERRIDE
{
if (splitwait)
ignoreuntil = ServerInstance->Time() + splitwait;
}
ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
{
if (chan)
{
joinfloodsettings *f = jf.ext.get(chan);
if (f && f->islocked())
{
user->WriteNumeric(ERR_UNAVAILRESOURCE, chan->name, "This channel is temporarily unavailable (+j is set). Please try again later.");
return MOD_RES_DENY;
}
}
return MOD_RES_PASSTHRU;
}
void OnUserJoin(Membership* memb, bool sync, bool created, CUList& excepts) CXX11_OVERRIDE
{
/* We arent interested in JOIN events caused by a network burst */
if (sync || ignoreuntil > ServerInstance->Time())
return;
joinfloodsettings *f = jf.ext.get(memb->chan);
/* But all others are OK */
if ((f) && (!f->islocked()))
{
f->addjoin();
if (f->shouldlock())
{
f->clear();
f->lock();
memb->chan->WriteNotice(InspIRCd::Format("This channel has been closed to new users for %u seconds because there have been more than %d joins in %d seconds.", duration, f->joins, f->secs));
}
}
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Adds channel mode j (joinflood) which helps protect against spammers which mass-join channels.", VF_VENDOR);
}
};
MODULE_INIT(ModuleJoinFlood)
|
