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 "configreader.h"
  16 #include "users.h"
  17 #include "modules.h"
  18 #include "xline.h"
  19 #include "commands/cmd_nick.h"
  20
  21 extern "C" DllExport command_t* init_command(InspIRCd* Instance)
  22 {
  23         return new cmd_nick(Instance);
  24 }
  25
  26 /** Handle nick changes from users.
  27  * NOTE: If you are used to ircds based on ircd2.8, and are looking
  28  * for the client introduction code in here, youre in the wrong place.
  29  * You need to look in the spanningtree module for this!
  30  */
  31 CmdResult cmd_nick::Handle (const char** parameters, int pcnt, userrec *user)
  32 {
  33         char oldnick[NICKMAX];
  34
  35         if (!*parameters[0] || !*user->nick)
  36         {
  37                 /* We cant put blanks in the parameters, so for this (extremely rare) issue we just put '*' here. */
  38                 user->WriteServ("432 %s * :Erroneous Nickname", *user->nick ? user->nick : "*");
  39                 return CMD_FAILURE;
  40         }
  41
  42         if (irc::string(user->nick) == irc::string(parameters[0]))
  43         {
  44                 /* If its exactly the same, even case, dont do anything. */
  45                 if (!strcmp(user->nick,parameters[0]))
  46                         return CMD_SUCCESS;
  47
  48                 /* Its a change of case. People insisted that they should be
  49                  * able to do silly things like this even though the RFC says
  50                  * the nick AAA is the same as the nick aaa.
  51                  */
  52                 strlcpy(oldnick, user->nick, NICKMAX - 1);
  53                 int MOD_RESULT = 0;
  54                 FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,parameters[0]));
  55                 if (MOD_RESULT)
  56                         return CMD_FAILURE;
  57                 if (user->registered == REG_ALL)
  58                         user->WriteCommon("NICK %s",parameters[0]);
  59                 strlcpy(user->nick, parameters[0], NICKMAX - 1);
  60                 user->InvalidateCache();
  61                 FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user,oldnick));
  62                 return CMD_SUCCESS;
  63         }
  64         else
  65         {
  66                 QLine* mq = ServerInstance->XLines->matches_qline(parameters[0]);
  67                 if (mq)
  68                 {
  69                         ServerInstance->SNO->WriteToSnoMask('x', "Q-Lined nickname %s from %s!%s@%s: %s", parameters[0], user->nick, user->ident, user->host, mq->reason);
  70                         user->WriteServ("432 %s %s :Invalid nickname: %s",user->nick,parameters[0], mq->reason);
  71                         return CMD_FAILURE;
  72                 }
  73                 /* Check for nickname overruled -
  74                  * This happens when one user has connected and sent only NICK, and is essentially
  75                  * "camping" upon a nickname. To give the new user connecting a fair chance of having
  76                  * the nickname too, we force a nickchange on the older user (Simply the one who was
  77                  * here first, no TS checks need to take place here)
  78                  */
  79                 userrec* InUse = ServerInstance->FindNick(parameters[0]);
  80                 if (InUse && (InUse != user) && (ServerInstance->IsNick(parameters[0])))
  81                 {
  82                         if (InUse->registered != REG_ALL)
  83                         {
  84                                 /* change the nick of the older user to nnn-overruled,
  85                                  * where nnn is their file descriptor. We know this to be unique.
  86                                  * NOTE: We must do this and not quit the user, even though we do
  87                                  * not have UID support yet. This is because if we set this user
  88                                  * as quitting and then introduce the new user before the old one
  89                                  * has quit, then the user hash gets totally buggered.
  90                                  * (Yes, that is a technical term). -- Brain
  91                                  */
  92                                 std::string changeback = ConvToStr(InUse->GetFd()) + "-overruled";
  93                                 InUse->WriteTo(InUse, "NICK %s", changeback.c_str());
  94                                 InUse->WriteServ("433 %s %s :Nickname overruled.", InUse->nick, InUse->nick);
  95                                 InUse->UpdateNickHash(changeback.c_str());
  96                                 strlcpy(InUse->nick, changeback.c_str(), NICKMAX - 1);
  97                                 InUse->InvalidateCache();
  98                                 /* Take away their nickname-sent state forcing them to send a nick again */
  99                                 InUse->registered &= ~REG_NICK;
 100                         }
 101                         else
 102                         {
 103                                 user->WriteServ("433 %s %s :Nickname is already in use.", user->registered >= REG_NICK ? user->nick : "*", parameters[0]);
 104                                 return CMD_FAILURE;
 105                         }
 106                 }
 107         }
 108         if ((!ServerInstance->IsNick(parameters[0])) && (IS_LOCAL(user)))
 109         {
 110                 user->WriteServ("432 %s %s :Erroneous Nickname",user->nick,parameters[0]);
 111                 return CMD_FAILURE;
 112         }
 113
 114         if (user->registered == REG_ALL)
 115         {
 116                 int MOD_RESULT = 0;
 117                 FOREACH_RESULT(I_OnUserPreNick,OnUserPreNick(user,parameters[0]));
 118                 if (MOD_RESULT) {
 119                         // if a module returns true, the nick change is silently forbidden.
 120                         return CMD_FAILURE;
 121                 }
 122
 123                 user->WriteCommon("NICK %s",parameters[0]);
 124
 125         }
 126
 127         strlcpy(oldnick, user->nick, NICKMAX - 1);
 128
 129         /* change the nick of the user in the users_hash */
 130         user = user->UpdateNickHash(parameters[0]);
 131
 132         /* actually change the nick within the record */
 133         if (!user) return CMD_FAILURE;
 134         if (!*user->nick) return CMD_FAILURE;
 135
 136         strlcpy(user->nick, parameters[0], NICKMAX - 1);
 137
 138         user->InvalidateCache();
 139
 140         /* Update display nicks */
 141         for (UCListIter v = user->chans.begin(); v != user->chans.end(); v++)
 142         {
 143                 CUList* ulist = v->first->GetUsers();
 144                 CUList::iterator i = ulist->find(user);
 145                 if (i != ulist->end())
 146                         i->second = user->nick;
 147         }
 148
 149         if (user->registered < REG_NICKUSER)
 150         {
 151                 user->registered = (user->registered | REG_NICK);
 152
 153                 if (ServerInstance->Config->NoUserDns)
 154                 {
 155                         user->dns_done = true;
 156                         ServerInstance->next_call = ServerInstance->Time();
 157                 }
 158                 else
 159                 {
 160                         user->StartDNSLookup();
 161                         if (user->dns_done)
 162                         {
 163                                 /* Cached result or instant failure - fall right through if possible */
 164                                 ServerInstance->next_call = ServerInstance->Time();
 165                         }
 166                         else
 167                         {
 168                                 if (ServerInstance->next_call > ServerInstance->Time() + ServerInstance->Config->dns_timeout)
 169                                         ServerInstance->next_call = ServerInstance->Time() + ServerInstance->Config->dns_timeout;
 170                         }
 171                 }
 172         }
 173         if (user->registered == REG_NICKUSER)
 174         {
 175                 /* user is registered now, bit 0 = USER command, bit 1 = sent a NICK command */
 176                 int MOD_RESULT = 0;
 177                 FOREACH_RESULT(I_OnUserRegister,OnUserRegister(user));
 178                 if (MOD_RESULT > 0)
 179                         return CMD_FAILURE;
 180         }
 181         if (user->registered == REG_ALL)
 182         {
 183                 FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user,oldnick));
 184         }
 185
 186         return CMD_SUCCESS;
 187
 188 }
 189