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1 /*
2  * InspIRCd -- Internet Relay Chat Daemon
3  *
4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
6  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
7  *   Copyright (C) 2005, 2007 Robin Burchell <robin+git@viroteck.net>
8  *   Copyright (C) 2005-2006 Craig Edwards <craigedwards@brainbox.cc>
9  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
10  *
11  * This file is part of InspIRCd.  InspIRCd is free software: you can
12  * redistribute it and/or modify it under the terms of the GNU General Public
13  * License as published by the Free Software Foundation, version 2.
14  *
15  * This program is distributed in the hope that it will be useful, but WITHOUT
16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
22  */
23
24
25 #include "inspircd.h"
26
27 /*
28  * This module supports the use of the +q and +a usermodes, but should work without them too.
29  * Usage of the command is restricted to +hoaq, and you cannot remove a user with a "higher" level than yourself.
30  * eg: +h can remove +hv and users with no modes. +a can remove +aohv and users with no modes.
31 */
32
33 /** Base class for /FPART and /REMOVE
34  */
35 class RemoveBase : public Command
36 {
37         bool& supportnokicks;
38         ChanModeReference& nokicksmode;
39
40  public:
41         RemoveBase(Module* Creator, bool& snk, ChanModeReference& nkm, const char* cmdn)
42                 : Command(Creator, cmdn, 2, 3)
43                 , supportnokicks(snk)
44                 , nokicksmode(nkm)
45         {
46         }
47
48         CmdResult HandleRMB(const std::vector<std::string>& parameters, User *user, bool neworder)
49         {
50                 User* target;
51                 Channel* channel;
52                 std::string reason;
53
54                 /* Set these to the parameters needed, the new version of this module switches it's parameters around
55                  * supplying a new command with the new order while keeping the old /remove with the older order.
56                  * /remove <nick> <channel> [reason ...]
57                  * /fpart <channel> <nick> [reason ...]
58                  */
59                 const std::string& channame = parameters[neworder ? 0 : 1];
60                 const std::string& username = parameters[neworder ? 1 : 0];
61
62                 /* Look up the user we're meant to be removing from the channel */
63                 if (IS_LOCAL(user))
64                         target = ServerInstance->FindNickOnly(username);
65                 else
66                         target = ServerInstance->FindNick(username);
67
68                 /* And the channel we're meant to be removing them from */
69                 channel = ServerInstance->FindChan(channame);
70
71                 /* Fix by brain - someone needs to learn to validate their input! */
72                 if ((!target) || (target->registered != REG_ALL) || (!channel))
73                 {
74                         user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", !channel ? channame.c_str() : username.c_str());
75                         return CMD_FAILURE;
76                 }
77
78                 if (!channel->HasUser(target))
79                 {
80                         user->WriteServ( "NOTICE %s :*** The user %s is not on channel %s", user->nick.c_str(), target->nick.c_str(), channel->name.c_str());
81                         return CMD_FAILURE;
82                 }
83
84                 int ulevel = channel->GetPrefixValue(user);
85                 int tlevel = channel->GetPrefixValue(target);
86
87                 if (target->server->IsULine())
88                 {
89                         user->WriteNumeric(482, "%s :Only a u-line may remove a u-line from a channel.", channame.c_str());
90                         return CMD_FAILURE;
91                 }
92
93                 /* We support the +Q channel mode via. the m_nokicks module, if the module is loaded and the mode is set then disallow the /remove */
94                 if ((!IS_LOCAL(user)) || (!supportnokicks) || (!channel->IsModeSet(nokicksmode)))
95                 {
96                         /* We'll let everyone remove their level and below, eg:
97                          * ops can remove ops, halfops, voices, and those with no mode (no moders actually are set to 1)
98                          * a ulined target will get a higher level than it's possible for a /remover to get..so they're safe.
99                          * Nobody may remove a founder.
100                          */
101                         if ((!IS_LOCAL(user)) || ((ulevel > VOICE_VALUE) && (ulevel >= tlevel) && (tlevel != 50000)))
102                         {
103                                 // REMOVE will be sent to the target's server and it will reply with a PART (or do nothing if it doesn't understand the command)
104                                 if (!IS_LOCAL(target))
105                                 {
106                                         // Send an ENCAP REMOVE with parameters being in the old <user> <chan> order which is
107                                         // compatible with both 2.0 and 2.2. This also turns FPART into REMOVE.
108                                         std::vector<std::string> p;
109                                         p.push_back(target->uuid);
110                                         p.push_back(channel->name);
111                                         if (parameters.size() > 2)
112                                                 p.push_back(":" + parameters[2]);
113                                         ServerInstance->PI->SendEncapsulatedData(target->server->GetName(), "REMOVE", p, user);
114
115                                         return CMD_SUCCESS;
116                                 }
117
118                                 std::string reasonparam;
119
120                                 /* If a reason is given, use it */
121                                 if(parameters.size() > 2)
122                                         reasonparam = parameters[2];
123                                 else
124                                         reasonparam = "No reason given";
125
126                                 /* Build up the part reason string. */
127                                 reason = "Removed by " + user->nick + ": " + reasonparam;
128
129                                 channel->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :%s removed %s from the channel", channel->name.c_str(), user->nick.c_str(), target->nick.c_str());
130                                 target->WriteNotice("*** " + user->nick + " removed you from " + channel->name + " with the message: " + reasonparam);
131
132                                 channel->PartUser(target, reason);
133                         }
134                         else
135                         {
136                                 user->WriteServ( "NOTICE %s :*** You do not have access to /remove %s from %s", user->nick.c_str(), target->nick.c_str(), channel->name.c_str());
137                                 return CMD_FAILURE;
138                         }
139                 }
140                 else
141                 {
142                         /* m_nokicks.so was loaded and +Q was set, block! */
143                         user->WriteNumeric(ERR_RESTRICTED, "%s :Can't remove user %s from channel (nokicks mode is set)", channel->name.c_str(), target->nick.c_str());
144                         return CMD_FAILURE;
145                 }
146
147                 return CMD_SUCCESS;
148         }
149 };
150
151 /** Handle /REMOVE
152  */
153 class CommandRemove : public RemoveBase
154 {
155  public:
156         CommandRemove(Module* Creator, bool& snk, ChanModeReference& nkm)
157                 : RemoveBase(Creator, snk, nkm, "REMOVE")
158         {
159                 syntax = "<nick> <channel> [<reason>]";
160                 TRANSLATE3(TR_NICK, TR_TEXT, TR_TEXT);
161         }
162
163         CmdResult Handle (const std::vector<std::string>& parameters, User *user)
164         {
165                 return HandleRMB(parameters, user, false);
166         }
167 };
168
169 /** Handle /FPART
170  */
171 class CommandFpart : public RemoveBase
172 {
173  public:
174         CommandFpart(Module* Creator, bool& snk, ChanModeReference& nkm)
175                 : RemoveBase(Creator, snk, nkm, "FPART")
176         {
177                 syntax = "<channel> <nick> [<reason>]";
178                 TRANSLATE3(TR_TEXT, TR_NICK, TR_TEXT);
179         }
180
181         CmdResult Handle (const std::vector<std::string>& parameters, User *user)
182         {
183                 return HandleRMB(parameters, user, true);
184         }
185 };
186
187 class ModuleRemove : public Module
188 {
189         ChanModeReference nokicksmode;
190         CommandRemove cmd1;
191         CommandFpart cmd2;
192         bool supportnokicks;
193
194  public:
195         ModuleRemove()
196                 : nokicksmode(this, "nokick")
197                 , cmd1(this, supportnokicks, nokicksmode)
198                 , cmd2(this, supportnokicks, nokicksmode)
199         {
200         }
201
202         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
203         {
204                 tokens["REMOVE"];
205         }
206
207         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
208         {
209                 supportnokicks = ServerInstance->Config->ConfValue("remove")->getBool("supportnokicks");
210         }
211
212         Version GetVersion() CXX11_OVERRIDE
213         {
214                 return Version("Provides a /remove command, this is mostly an alternative to /kick, except makes users appear to have parted the channel", VF_OPTCOMMON | VF_VENDOR);
215         }
216 };
217
218 MODULE_INIT(ModuleRemove)