src/coremods/core_user/cmd_mode.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2014 Attila Molnar <attilamolnar@hush.com>
   5  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   6  *   Copyright (C) 2006-2008 Robin Burchell <robin+git@viroteck.net>
   7  *   Copyright (C) 2004-2008 Craig Edwards <craigedwards@brainbox.cc>
   8  *
   9  * This file is part of InspIRCd.  InspIRCd is free software: you can
  10  * redistribute it and/or modify it under the terms of the GNU General Public
  11  * License as published by the Free Software Foundation, version 2.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "inspircd.h"
  23 #include "core_user.h"
  24
  25 CommandMode::CommandMode(Module* parent)
  26         : Command(parent, "MODE", 1)
  27         , seq(0)
  28 {
  29         syntax = "<target> <modes> {<mode-parameters>}";
  30         memset(&sent, 0, sizeof(sent));
  31 }
  32
  33 CmdResult CommandMode::Handle(const std::vector<std::string>& parameters, User* user)
  34 {
  35         const std::string& target = parameters[0];
  36         Channel* targetchannel = ServerInstance->FindChan(target);
  37         User* targetuser = NULL;
  38         if (!targetchannel)
  39         {
  40                 if (IS_LOCAL(user))
  41                         targetuser = ServerInstance->FindNickOnly(target);
  42                 else
  43                         targetuser = ServerInstance->FindNick(target);
  44         }
  45
  46         if ((!targetchannel) && (!targetuser))
  47         {
  48                 if (target[0] == '#')
  49                         user->WriteNumeric(Numerics::NoSuchChannel(target));
  50                 else
  51                         user->WriteNumeric(Numerics::NoSuchNick(target));
  52                 return CMD_FAILURE;
  53         }
  54         if (parameters.size() == 1)
  55         {
  56                 this->DisplayCurrentModes(user, targetuser, targetchannel);
  57                 return CMD_SUCCESS;
  58         }
  59
  60         // Populate a temporary Modes::ChangeList with the parameters
  61         Modes::ChangeList changelist;
  62         ModeType type = targetchannel ? MODETYPE_CHANNEL : MODETYPE_USER;
  63         ServerInstance->Modes.ModeParamsToChangeList(user, type, parameters, changelist);
  64
  65         ModResult MOD_RESULT;
  66         FIRST_MOD_RESULT(OnPreMode, MOD_RESULT, (user, targetuser, targetchannel, changelist));
  67
  68         ModeParser::ModeProcessFlag flags = ModeParser::MODE_NONE;
  69         if (IS_LOCAL(user))
  70         {
  71                 if (MOD_RESULT == MOD_RES_PASSTHRU)
  72                 {
  73                         if ((targetuser) && (user != targetuser))
  74                         {
  75                                 // Local users may only change the modes of other users if a module explicitly allows it
  76                                 user->WriteNumeric(ERR_USERSDONTMATCH, "Can't change mode for other users");
  77                                 return CMD_FAILURE;
  78                         }
  79
  80                         // This is a mode change by a local user and modules didn't explicitly allow/deny.
  81                         // Ensure access checks will happen for each mode being changed.
  82                         flags |= ModeParser::MODE_CHECKACCESS;
  83                 }
  84                 else if (MOD_RESULT == MOD_RES_DENY)
  85                         return CMD_FAILURE; // Entire mode change denied by a module
  86         }
  87         else
  88                 flags |= ModeParser::MODE_LOCALONLY;
  89
  90         if (IS_LOCAL(user))
  91                 ServerInstance->Modes->ProcessSingle(user, targetchannel, targetuser, changelist, flags);
  92         else
  93                 ServerInstance->Modes->Process(user, targetchannel, targetuser, changelist, flags);
  94
  95         if ((ServerInstance->Modes.GetLastParse().empty()) && (targetchannel) && (parameters.size() == 2))
  96         {
  97                 /* Special case for displaying the list for listmodes,
  98                  * e.g. MODE #chan b, or MODE #chan +b without a parameter
  99                  */
 100                 this->DisplayListModes(user, targetchannel, parameters[1]);
 101         }
 102
 103         return CMD_SUCCESS;
 104 }
 105
 106 RouteDescriptor CommandMode::GetRouting(User* user, const std::vector<std::string>& parameters)
 107 {
 108         return (IS_LOCAL(user) ? ROUTE_LOCALONLY : ROUTE_BROADCAST);
 109 }
 110
 111 void CommandMode::DisplayListModes(User* user, Channel* chan, const std::string& mode_sequence)
 112 {
 113         seq++;
 114
 115         for (std::string::const_iterator i = mode_sequence.begin(); i != mode_sequence.end(); ++i)
 116         {
 117                 unsigned char mletter = *i;
 118                 if (mletter == '+')
 119                         continue;
 120
 121                 ModeHandler* mh = ServerInstance->Modes->FindMode(mletter, MODETYPE_CHANNEL);
 122                 if (!mh || !mh->IsListMode())
 123                         return;
 124
 125                 /* Ensure the user doesnt request the same mode twice,
 126                  * so they can't flood themselves off out of idiocy.
 127                  */
 128                 if (sent[mletter] == seq)
 129                         continue;
 130
 131                 sent[mletter] = seq;
 132                 ServerInstance->Modes.ShowListModeList(user, chan, mh);
 133         }
 134 }
 135
 136 static std::string GetSnomasks(const User* user)
 137 {
 138         ModeHandler* const snomask = ServerInstance->Modes.FindMode('s', MODETYPE_USER);
 139         std::string snomaskstr = snomask->GetUserParameter(user);
 140         // snomaskstr is empty if the snomask mode isn't set, otherwise it begins with a '+'.
 141         // In the former case output a "+", not an empty string.
 142         if (snomaskstr.empty())
 143                 snomaskstr.push_back('+');
 144         return snomaskstr;
 145 }
 146
 147 void CommandMode::DisplayCurrentModes(User* user, User* targetuser, Channel* targetchannel)
 148 {
 149         if (targetchannel)
 150         {
 151                 // Display channel's current mode string
 152                 user->WriteNumeric(RPL_CHANNELMODEIS, targetchannel->name, (std::string("+") + targetchannel->ChanModes(targetchannel->HasUser(user))));
 153                 user->WriteNumeric(RPL_CHANNELCREATED, targetchannel->name, (unsigned long)targetchannel->age);
 154         }
 155         else
 156         {
 157                 if (targetuser == user)
 158                 {
 159                         // Display user's current mode string
 160                         user->WriteNumeric(RPL_UMODEIS, targetuser->GetModeLetters());
 161                         if (targetuser->IsOper())
 162                                 user->WriteNumeric(RPL_SNOMASKIS, GetSnomasks(targetuser), "Server notice mask");
 163                 }
 164                 else if (user->HasPrivPermission("users/auspex"))
 165                 {
 166                         // Querying the modes of another user.
 167                         // We cannot use RPL_UMODEIS because that's only for showing the user's own modes.
 168                         user->WriteNumeric(RPL_OTHERUMODEIS, targetuser->nick, targetuser->GetModeLetters());
 169                         if (targetuser->IsOper())
 170                                 user->WriteNumeric(RPL_OTHERSNOMASKIS, targetuser->nick, GetSnomasks(targetuser), "Server notice mask");
 171                 }
 172                 else
 173                 {
 174                         user->WriteNumeric(ERR_USERSDONTMATCH, "Can't view modes for other users");
 175                 }
 176         }
 177 }