src/commands/cmd_nick.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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 std::vector<std::string>& parameters, User *user)
  29 {
  30         std::string oldnick;
  31
  32         if (parameters[0].empty())
  33         {
  34                 /* We cant put blanks in the parameters, so for this (extremely rare) issue we just put '*' here. */
  35                 user->WriteNumeric(432, "%s * :Erroneous Nickname", user->nick.empty() ? user->nick.c_str() : "*");
  36                 return CMD_FAILURE;
  37         }
  38
  39         if (((!ServerInstance->IsNick(parameters[0].c_str(), ServerInstance->Config->Limits.NickMax))) && (IS_LOCAL(user)))
  40         {
  41                 if (!allowinvalid)
  42                 {
  43                         if (parameters[0] == "0")
  44                         {
  45                                 // Special case, Fake a /nick UIDHERE. Useful for evading "ERR: NICK IN USE" on connect etc.
  46                                 std::vector<std::string> p2;
  47                                 std::deque<classbase*> dummy;
  48                                 p2.push_back(user->uuid);
  49                                 this->HandleInternal(1, dummy);
  50                                 this->Handle(p2, user);
  51                                 this->HandleInternal(0, dummy);
  52                                 return CMD_SUCCESS;
  53                         }
  54
  55                         user->WriteNumeric(432, "%s %s :Erroneous Nickname", user->nick.c_str(),parameters[0].c_str());
  56                         return CMD_FAILURE;
  57                 }
  58         }
  59
  60         if (assign(user->nick) == parameters[0])
  61         {
  62                 /* If its exactly the same, even case, dont do anything. */
  63                 if (parameters[0] == user->nick)
  64                 {
  65                         return CMD_SUCCESS;
  66                 }
  67
  68                 /* Its a change of case. People insisted that they should be
  69                  * able to do silly things like this even though the RFC says
  70                  * the nick AAA is the same as the nick aaa.
  71                  */
  72                 oldnick.assign(user->nick, 0, ServerInstance->Config->Limits.NickMax);
  73                 int MOD_RESULT = 0;
  74                 FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,parameters[0]));
  75                 if (MOD_RESULT)
  76                         return CMD_FAILURE;
  77                 if (user->registered == REG_ALL)
  78                         user->WriteCommon("NICK %s",parameters[0].c_str());
  79                 user->nick.assign(parameters[0], 0, ServerInstance->Config->Limits.NickMax);
  80                 user->InvalidateCache();
  81                 FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user,oldnick));
  82                 return CMD_SUCCESS;
  83         }
  84         else
  85         {
  86                 /*
  87                  * Don't check Q:Lines if it's a server-enforced change, just on the off-chance some fucking *moron*
  88                  * tries to Q:Line SIDs, also, this means we just get our way period, as it really should be.
  89                  * Thanks Kein for finding this. -- w00t
  90                  *
  91                  * Also don't check Q:Lines for remote nickchanges, they should have our Q:Lines anyway to enforce themselves.
  92                  *              -- w00t
  93                  */
  94                 if (!allowinvalid || !IS_LOCAL(user))
  95                 {
  96                         XLine* mq = ServerInstance->XLines->MatchesLine("Q",parameters[0]);
  97                         if (mq)
  98                         {
  99                                 if (user->registered == REG_ALL)
 100                                 {
 101                                         ServerInstance->SNO->WriteToSnoMask('x', "Q-Lined nickname %s from %s!%s@%s: %s", parameters[0].c_str(), user->nick.c_str(), user->ident.c_str(), user->host.c_str(), mq->reason);
 102                                 }
 103                                 user->WriteNumeric(432, "%s %s :Invalid nickname: %s",user->nick.c_str(), parameters[0].c_str(), mq->reason);
 104                                 return CMD_FAILURE;
 105                         }
 106
 107                         if (ServerInstance->Config->RestrictBannedUsers)
 108                         {
 109                                 for (UCListIter i = user->chans.begin(); i != user->chans.end(); i++)
 110                                 {
 111                                         Channel *chan = i->first;
 112                                         if (chan->GetStatus(user) < STATUS_VOICE && chan->IsBanned(user))
 113                                         {
 114                                                 user->WriteNumeric(404, "%s %s :Cannot send to channel (you're banned)", user->nick.c_str(), chan->name.c_str());
 115                                                 return CMD_FAILURE;
 116                                         }
 117                                 }
 118                         }
 119                 }
 120
 121                 /*
 122                  * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
 123                  * then we have a potential collide. Check whether someone else is camping on the nick
 124                  * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
 125                  * camper to their UID, and allow the incoming nick change.
 126                  *
 127                  * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
 128                  * because the nick is already (rightfully) in use. -- w00t
 129                  */
 130                 User* InUse = ServerInstance->FindNickOnly(parameters[0]);
 131                 if (InUse && (InUse != user))
 132                 {
 133                         if (InUse->registered != REG_ALL)
 134                         {
 135                                 /* force the camper to their UUID, and ask them to re-send a NICK. */
 136                                 InUse->WriteTo(InUse, "NICK %s", InUse->uuid.c_str());
 137                                 InUse->WriteNumeric(433, "%s %s :Nickname overruled.", InUse->nick.c_str(), InUse->nick.c_str());
 138                                 InUse->UpdateNickHash(InUse->uuid.c_str());
 139                                 InUse->nick.assign(InUse->uuid, 0, ServerInstance->Config->Limits.NickMax);
 140                                 InUse->InvalidateCache();
 141                                 InUse->registered &= ~REG_NICK;
 142                         }
 143                         else
 144                         {
 145                                 /* No camping, tell the incoming user  to stop trying to change nick ;p */
 146                                 user->WriteNumeric(433, "%s %s :Nickname is already in use.", user->registered >= REG_NICK ? user->nick.c_str() : "*", parameters[0].c_str());
 147                                 return CMD_FAILURE;
 148                         }
 149                 }
 150         }
 151
 152
 153         int MOD_RESULT = 0;
 154         FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user, parameters[0]));
 155         if (MOD_RESULT)
 156                 // if a module returns true, the nick change is silently forbidden.
 157                 return CMD_FAILURE;
 158
 159         if (user->registered == REG_ALL)
 160                 user->WriteCommon("NICK %s", parameters[0].c_str());
 161
 162         oldnick.assign(user->nick, 0, ServerInstance->Config->Limits.NickMax);
 163
 164         /* change the nick of the user in the users_hash */
 165         user = user->UpdateNickHash(parameters[0].c_str());
 166
 167         /* actually change the nick within the record */
 168         if (!user)
 169                 return CMD_FAILURE;
 170
 171         user->nick.assign(parameters[0], 0, ServerInstance->Config->Limits.NickMax);
 172         user->InvalidateCache();
 173
 174         /* Update display nicks */
 175         for (UCListIter v = user->chans.begin(); v != user->chans.end(); v++)
 176         {
 177                 CUList* ulist = v->first->GetUsers();
 178                 CUList::iterator i = ulist->find(user);
 179                 if (i != ulist->end())
 180                         i->second = user->nick;
 181         }
 182
 183         if (user->registered < REG_NICKUSER)
 184         {
 185                 user->registered = (user->registered | REG_NICK);
 186         }
 187
 188         // Keep these seperate!
 189
 190         if (user->registered == REG_NICKUSER)
 191         {
 192                 /* user is registered now, bit 0 = USER command, bit 1 = sent a NICK command */
 193                 MOD_RESULT = 0;
 194                 FOREACH_RESULT(I_OnUserRegister,OnUserRegister(user));
 195                 if (MOD_RESULT > 0)
 196                         return CMD_FAILURE;
 197         }
 198         else if (user->registered == REG_ALL)
 199         {
 200                 user->IncreasePenalty(10);
 201                 FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user, oldnick));
 202         }
 203
 204         return CMD_SUCCESS;
 205
 206 }
 207
 208 CmdResult CommandNick::HandleInternal(const unsigned int id, const std::deque<classbase*>&)
 209 {
 210         allowinvalid = (id != 0);
 211         return CMD_SUCCESS;
 212 }
 213