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1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
6  * See: http://www.inspircd.org/wiki/index.php/Credits
7  *
8  * This program is free but copyrighted software; see
9  *            the file COPYING for details.
10  *
11  * ---------------------------------------------------
12  */
13
14 #include "inspircd.h"
15 #include "xline.h"
16 #include "commands/cmd_nick.h"
17
18 extern "C" DllExport Command* init_command(InspIRCd* Instance)
19 {
20         return new CommandNick(Instance);
21 }
22
23 /** Handle nick changes from users.
24  * NOTE: If you are used to ircds based on ircd2.8, and are looking
25  * for the client introduction code in here, youre in the wrong place.
26  * You need to look in the spanningtree module for this!
27  */
28 CmdResult CommandNick::Handle (const char** parameters, int, User *user)
29 {
30         char oldnick[NICKMAX];
31
32         if (!*parameters[0] || !*user->nick)
33         {
34                 /* We cant put blanks in the parameters, so for this (extremely rare) issue we just put '*' here. */
35                 user->WriteServ("432 %s * :Erroneous Nickname", *user->nick ? user->nick : "*");
36                 return CMD_FAILURE;
37         }
38
39         if (irc::string(user->nick) == irc::string(parameters[0]))
40         {
41                 /* If its exactly the same, even case, dont do anything. */
42                 if (!strcmp(user->nick,parameters[0]))
43                         return CMD_SUCCESS;
44
45                 /* Its a change of case. People insisted that they should be
46                  * able to do silly things like this even though the RFC says
47                  * the nick AAA is the same as the nick aaa.
48                  */
49                 strlcpy(oldnick, user->nick, NICKMAX - 1);
50                 int MOD_RESULT = 0;
51                 FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,parameters[0]));
52                 if (MOD_RESULT)
53                         return CMD_FAILURE;
54                 if (user->registered == REG_ALL)
55                         user->WriteCommon("NICK %s",parameters[0]);
56                 strlcpy(user->nick, parameters[0], NICKMAX - 1);
57                 user->InvalidateCache();
58                 FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user,oldnick));
59                 return CMD_SUCCESS;
60         }
61         else
62         {
63                 XLine* mq = ServerInstance->XLines->MatchesLine("Q",parameters[0]);
64                 if (mq)
65                 {
66                         ServerInstance->SNO->WriteToSnoMask('x', "Q-Lined nickname %s from %s!%s@%s: %s", parameters[0], user->nick, user->ident, user->host, mq->reason);
67                         user->WriteServ("432 %s %s :Invalid nickname: %s",user->nick,parameters[0], mq->reason);
68                         return CMD_FAILURE;
69                 }
70
71                 /*
72                  * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
73                  * then we have a potential collide. Check whether someone else is camping on the nick
74                  * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
75                  * camper to their UID, and allow the incoming nick change.
76                  *
77                  * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
78                  * because the nick is already (rightfully) in use. -- w00t
79                  */
80                 User* InUse = ServerInstance->FindNickOnly(parameters[0]);
81                 if (InUse && (InUse != user) && ((ServerInstance->IsNick(parameters[0]) || allowinvalid)))
82                 {
83                         if (InUse->registered != REG_ALL)
84                         {
85                                 /* force the camper to their UUID, and ask them to re-send a NICK. */
86                                 InUse->WriteTo(InUse, "NICK %s", InUse->uuid);
87                                 InUse->WriteServ("433 %s %s :Nickname overruled.", InUse->nick, InUse->nick);
88                                 InUse->UpdateNickHash(InUse->uuid);
89                                 strlcpy(InUse->nick, InUse->uuid, NICKMAX - 1);
90                                 InUse->InvalidateCache();
91                                 InUse->registered &= ~REG_NICK;
92                         }
93                         else
94                         {
95                                 /* No camping, tell the incoming user  to stop trying to change nick ;p */
96                                 user->WriteServ("433 %s %s :Nickname is already in use.", user->registered >= REG_NICK ? user->nick : "*", parameters[0]);
97                                 return CMD_FAILURE;
98                         }
99                 }
100         }
101         if (((!ServerInstance->IsNick(parameters[0]))) && (IS_LOCAL(user)))
102         {
103                 if (!allowinvalid)
104                 {
105                         user->WriteServ("432 %s %s :Erroneous Nickname",user->nick,parameters[0]);
106                         return CMD_FAILURE;
107                 }
108         }
109
110         int MOD_RESULT = 0;
111         FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,parameters[0]));
112         if (MOD_RESULT)
113                 // if a module returns true, the nick change is silently forbidden.
114                 return CMD_FAILURE;
115
116         if (user->registered == REG_ALL)
117                 user->WriteCommon("NICK %s",parameters[0]);
118
119         strlcpy(oldnick, user->nick, NICKMAX - 1);
120
121         /* change the nick of the user in the users_hash */
122         user = user->UpdateNickHash(parameters[0]);
123
124         /* actually change the nick within the record */
125         if (!user)
126                 return CMD_FAILURE;
127         if (!*user->nick)
128                 return CMD_FAILURE;
129
130         strlcpy(user->nick, parameters[0], NICKMAX - 1);
131
132         user->InvalidateCache();
133
134         /* Update display nicks */
135         for (UCListIter v = user->chans.begin(); v != user->chans.end(); v++)
136         {
137                 CUList* ulist = v->first->GetUsers();
138                 CUList::iterator i = ulist->find(user);
139                 if (i != ulist->end())
140                         i->second = user->nick;
141         }
142
143         if (user->registered < REG_NICKUSER)
144         {
145                 user->registered = (user->registered | REG_NICK);
146         }
147         else if (user->registered == REG_NICKUSER)
148         {
149                 /* user is registered now, bit 0 = USER command, bit 1 = sent a NICK command */
150                 int MOD_RESULT = 0;
151                 FOREACH_RESULT(I_OnUserRegister,OnUserRegister(user));
152                 if (MOD_RESULT > 0)
153                         return CMD_FAILURE;
154         }
155         else if (user->registered == REG_ALL)
156         {
157                 user->IncreasePenalty(10);
158                 FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user,oldnick));
159         }
160
161         return CMD_SUCCESS;
162
163 }
164
165 CmdResult CommandNick::HandleInternal(const unsigned int id, const std::deque<classbase*>&)
166 {
167         allowinvalid = (id != 0);
168         return CMD_SUCCESS;
169 }
170