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
242
243
244
245
246
247
248
249
250
251
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2020 Sadie Powell <sadie@witchery.services>
*
* 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"
typedef std::bitset<UCHAR_MAX + 1> AllowedChars;
namespace
{
// The characters which are allowed in nicknames.
AllowedChars allowedchars;
// The characters which are allowed at the front of a nickname.
AllowedChars allowedfrontchars;
// The mapping of lower case characters to upper case characters.
unsigned char casemap[UCHAR_MAX];
bool IsValidNick(const std::string& nick)
{
if (nick.empty() || nick.length() > ServerInstance->Config->Limits.NickMax)
return false;
for (std::string::const_iterator iter = nick.begin(); iter != nick.end(); ++iter)
{
unsigned char chr = static_cast<unsigned char>(*iter);
// Check that the character is allowed at the front of the nick.
if (iter == nick.begin() && !allowedfrontchars[chr])
return false;
// Check that the character is allowed in the nick.
if (!allowedchars[chr])
return false;
}
return true;
}
}
class ModuleCodepage
: public Module
{
private:
// The character map which was set before this module was loaded.
const unsigned char* origcasemap;
// The name of the character map which was set before this module was loaded.
const std::string origcasemapname;
// The IsNick handler which was set before this module was loaded.
const TR1NS::function<bool(const std::string&)> origisnick;
// The character set used for the codepage.
std::string charset;
template <typename T>
void RehashHashmap(T& hashmap)
{
T newhash(hashmap.bucket_count());
for (typename T::const_iterator i = hashmap.begin(); i != hashmap.end(); ++i)
newhash.insert(std::make_pair(i->first, i->second));
hashmap.swap(newhash);
}
void CheckDuplicateNick()
{
insp::flat_set<std::string, irc::insensitive_swo> duplicates;
const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
for (UserManager::LocalList::const_iterator iter = list.begin(); iter != list.end(); ++iter)
{
LocalUser* user = *iter;
if (user->nick != user->uuid && !duplicates.insert(user->nick).second)
{
user->WriteNumeric(RPL_SAVENICK, user->uuid, "Your nickname is no longer available.");
user->ChangeNick(user->uuid);
}
}
}
void CheckInvalidNick()
{
const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
for (UserManager::LocalList::const_iterator iter = list.begin(); iter != list.end(); ++iter)
{
LocalUser* user = *iter;
if (user->nick != user->uuid && !ServerInstance->IsNick(user->nick))
{
user->WriteNumeric(RPL_SAVENICK, user->uuid, "Your nickname is no longer valid.");
user->ChangeNick(user->uuid);
}
}
}
void CheckRehash(unsigned char* prevmap)
{
if (!memcmp(prevmap, national_case_insensitive_map, UCHAR_MAX))
return;
RehashHashmap(ServerInstance->Users.clientlist);
RehashHashmap(ServerInstance->Users.uuidlist);
RehashHashmap(ServerInstance->chanlist);
}
public:
ModuleCodepage()
: origcasemap(national_case_insensitive_map)
, origcasemapname(ServerInstance->Config->CaseMapping)
, origisnick(ServerInstance->IsNick)
{
}
~ModuleCodepage()
{
ServerInstance->IsNick = origisnick;
CheckInvalidNick();
ServerInstance->Config->CaseMapping = origcasemapname;
national_case_insensitive_map = origcasemap;
CheckDuplicateNick();
CheckRehash(casemap);
ServerInstance->ISupport.Build();
}
void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
{
ConfigTag* codepagetag = ServerInstance->Config->ConfValue("codepage");
const std::string name = codepagetag->getString("name");
if (name.empty())
throw ModuleException("<codepage:name> is a required field!");
AllowedChars newallowedchars;
AllowedChars newallowedfrontchars;
ConfigTagList cpchars = ServerInstance->Config->ConfTags("cpchars");
for (ConfigIter i = cpchars.first; i != cpchars.second; ++i)
{
ConfigTag* tag = i->second;
unsigned char begin = tag->getUInt("begin", tag->getUInt("index", 0), 1, UCHAR_MAX);
if (!begin)
throw ModuleException("<cpchars> tag without index or begin specified at " + tag->getTagLocation());
unsigned char end = tag->getUInt("end", begin, 1, UCHAR_MAX);
if (begin > end)
throw ModuleException("<cpchars:begin> must be lower than <cpchars:end> at " + tag->getTagLocation());
bool front = tag->getBool("front", false);
for (unsigned short pos = begin; pos <= end; ++pos)
{
if (pos == '\n' || pos == '\r' || pos == ' ')
{
throw ModuleException(InspIRCd::Format("<cpchars> tag contains a forbidden character: %u at %s",
pos, tag->getTagLocation().c_str()));
}
if (front && (pos == ':' || isdigit(pos)))
{
throw ModuleException(InspIRCd::Format("<cpchars> tag contains a forbidden front character: %u at %s",
pos, tag->getTagLocation().c_str()));
}
newallowedchars.set(pos);
newallowedfrontchars.set(pos, front);
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Marked %u (%c) as allowed (front: %s)",
pos, pos, front ? "yes" : "no");
}
}
unsigned char newcasemap[UCHAR_MAX];
for (size_t i = 0; i < UCHAR_MAX; ++i)
newcasemap[i] = i;
ConfigTagList cpcase = ServerInstance->Config->ConfTags("cpcase");
for (ConfigIter i = cpcase.first; i != cpcase.second; ++i)
{
ConfigTag* tag = i->second;
unsigned char lower = tag->getUInt("lower", 0, 1, UCHAR_MAX);
if (!lower)
throw ModuleException("<cpcase:lower> is required at " + tag->getTagLocation());
unsigned char upper = tag->getUInt("upper", 0, 1, UCHAR_MAX);
if (!upper)
throw ModuleException("<cpcase:upper> is required at " + tag->getTagLocation());
newcasemap[upper] = lower;
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Marked %u (%c) as the lower case version of %u (%c)",
lower, lower, upper, upper);
}
charset = codepagetag->getString("charset");
std::swap(allowedchars, newallowedchars);
std::swap(allowedfrontchars, newallowedfrontchars);
std::swap(casemap, newcasemap);
ServerInstance->IsNick = &IsValidNick;
CheckInvalidNick();
ServerInstance->Config->CaseMapping = name;
national_case_insensitive_map = casemap;
CheckRehash(newcasemap);
ServerInstance->ISupport.Build();
}
void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
{
if (!charset.empty())
tokens["CHARSET"] = charset;
}
Version GetVersion() CXX11_OVERRIDE
{
std::stringstream linkdata;
linkdata << "front=";
for (size_t i = 0; i < allowedfrontchars.size(); ++i)
if (allowedfrontchars[i])
linkdata << static_cast<unsigned char>(i);
linkdata << "&middle=";
for (size_t i = 0; i < allowedchars.size(); ++i)
if (allowedchars[i])
linkdata << static_cast<unsigned char>(i);
linkdata << "&map=";
for (size_t i = 0; i < sizeof(casemap); ++i)
if (casemap[i] != i)
linkdata << static_cast<unsigned char>(i) << casemap[i] << ',';
return Version("Allows the server administrator to define what characters are allowed in nicknames and how characters should be compared in a case insensitive way.", VF_COMMON | VF_VENDOR, linkdata.str());
}
};
MODULE_INIT(ModuleCodepage)
|
