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