src/cmd_nick.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 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_t* init_command(InspIRCd* Instance)
  19 {
  20         return new cmd_nick(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 cmd_nick::Handle (const char** parameters, int pcnt, userrec *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                 QLine* mq = ServerInstance->XLines->matches_qline(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                 /* Check for nickname overruled -
  71                  * This happens when one user has connected and sent only NICK, and is essentially
  72                  * "camping" upon a nickname. To give the new user connecting a fair chance of having
  73                  * the nickname too, we force a nickchange on the older user (Simply the one who was
  74                  * here first, no TS checks need to take place here)
  75                  */
  76                 userrec* InUse = ServerInstance->FindNickOnly(parameters[0]);
  77                 if (InUse && (InUse != user) && ((ServerInstance->IsNick(parameters[0]) || allowinvalid)))
  78                 {
  79                         if (InUse->registered != REG_ALL)
  80                         {
  81                                 /* change the nick of the older user to its UUID
  82                                  */
  83                                 InUse->WriteTo(InUse, "NICK %s", InUse->uuid);
  84                                 InUse->WriteServ("433 %s %s :Nickname overruled.", InUse->nick, InUse->nick);
  85                                 InUse->UpdateNickHash(InUse->uuid);
  86                                 strlcpy(InUse->nick, InUse->uuid, NICKMAX - 1);
  87                                 InUse->InvalidateCache();
  88                                 /* Take away their nickname-sent state forcing them to send a nick again */
  89                                 InUse->registered &= ~REG_NICK;
  90                         }
  91                         else
  92                         {
  93                                 user->WriteServ("433 %s %s :Nickname is already in use.", user->registered >= REG_NICK ? user->nick : "*", parameters[0]);
  94                                 return CMD_FAILURE;
  95                         }
  96                 }
  97         }
  98         if (((!ServerInstance->IsNick(parameters[0]))) && (IS_LOCAL(user)))
  99         {
 100                 if (!allowinvalid)
 101                 {
 102                         user->WriteServ("432 %s %s :Erroneous Nickname",user->nick,parameters[0]);
 103                         return CMD_FAILURE;
 104                 }
 105         }
 106
 107         int MOD_RESULT = 0;
 108         FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,parameters[0]));
 109         if (MOD_RESULT)
 110                 // if a module returns true, the nick change is silently forbidden.
 111                 return CMD_FAILURE;
 112
 113         if (user->registered == REG_ALL)
 114                 user->WriteCommon("NICK %s",parameters[0]);
 115
 116         strlcpy(oldnick, user->nick, NICKMAX - 1);
 117
 118         /* change the nick of the user in the users_hash */
 119         user = user->UpdateNickHash(parameters[0]);
 120
 121         /* actually change the nick within the record */
 122         if (!user)
 123                 return CMD_FAILURE;
 124         if (!*user->nick)
 125                 return CMD_FAILURE;
 126
 127         strlcpy(user->nick, parameters[0], NICKMAX - 1);
 128
 129         user->InvalidateCache();
 130
 131         /* Update display nicks */
 132         for (UCListIter v = user->chans.begin(); v != user->chans.end(); v++)
 133         {
 134                 CUList* ulist = v->first->GetUsers();
 135                 CUList::iterator i = ulist->find(user);
 136                 if (i != ulist->end())
 137                         i->second = user->nick;
 138         }
 139
 140         if (user->registered < REG_NICKUSER)
 141         {
 142                 user->registered = (user->registered | REG_NICK);
 143
 144                 if (ServerInstance->Config->NoUserDns)
 145                 {
 146                         user->dns_done = true;
 147                         ServerInstance->next_call = ServerInstance->Time();
 148                 }
 149                 else
 150                 {
 151                         user->StartDNSLookup();
 152                         if (user->dns_done)
 153                         {
 154                                 /* Cached result or instant failure - fall right through if possible */
 155                                 ServerInstance->next_call = ServerInstance->Time();
 156                         }
 157                         else
 158                         {
 159                                 if (ServerInstance->next_call > ServerInstance->Time() + ServerInstance->Config->dns_timeout)
 160                                         ServerInstance->next_call = ServerInstance->Time() + ServerInstance->Config->dns_timeout;
 161                         }
 162                 }
 163         }
 164         if (user->registered == REG_NICKUSER)
 165         {
 166                 /* user is registered now, bit 0 = USER command, bit 1 = sent a NICK command */
 167                 int MOD_RESULT = 0;
 168                 FOREACH_RESULT(I_OnUserRegister,OnUserRegister(user));
 169                 if (MOD_RESULT > 0)
 170                         return CMD_FAILURE;
 171         }
 172         if (user->registered == REG_ALL)
 173         {
 174                 FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user,oldnick));
 175         }
 176
 177         return CMD_SUCCESS;
 178
 179 }
 180
 181 CmdResult cmd_nick::HandleInternal(const unsigned int id, const std::deque<classbase*> &parameters)
 182 {
 183         allowinvalid = (id != 0);
 184         return CMD_SUCCESS;
 185 }
 186