src/commands/cmd_whowas.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   6  *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   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
  23 #include "inspircd.h"
  24 #include "commands/cmd_whowas.h"
  25
  26 CommandWhowas::CommandWhowas( Module* parent)
  27         : Command(parent, "WHOWAS", 1)
  28         , GroupSize(0), MaxGroups(0), MaxKeep(0)
  29 {
  30         syntax = "<nick>{,<nick>}";
  31         Penalty = 2;
  32 }
  33
  34 CmdResult CommandWhowas::Handle (const std::vector<std::string>& parameters, User* user)
  35 {
  36         /* if whowas disabled in config */
  37         if (this->GroupSize == 0 || this->MaxGroups == 0)
  38         {
  39                 user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s :This command has been disabled.", name.c_str());
  40                 return CMD_FAILURE;
  41         }
  42
  43         whowas_users::iterator i = whowas.find(assign(parameters[0]));
  44
  45         if (i == whowas.end())
  46         {
  47                 user->WriteNumeric(ERR_WASNOSUCHNICK, "%s :There was no such nickname", parameters[0].c_str());
  48         }
  49         else
  50         {
  51                 whowas_set* grp = i->second;
  52                 if (!grp->empty())
  53                 {
  54                         for (whowas_set::iterator ux = grp->begin(); ux != grp->end(); ux++)
  55                         {
  56                                 WhoWasGroup* u = *ux;
  57
  58                                 user->WriteNumeric(RPL_WHOWASUSER, "%s %s %s * :%s", parameters[0].c_str(),
  59                                         u->ident.c_str(),u->dhost.c_str(),u->gecos.c_str());
  60
  61                                 if (user->HasPrivPermission("users/auspex"))
  62                                         user->WriteNumeric(RPL_WHOWASIP, "%s :was connecting from *@%s",
  63                                                 parameters[0].c_str(), u->host.c_str());
  64
  65                                 std::string signon = InspIRCd::TimeString(u->signon);
  66                                 bool hide_server = (!ServerInstance->Config->HideWhoisServer.empty() && !user->HasPrivPermission("servers/auspex"));
  67                                 user->WriteNumeric(RPL_WHOISSERVER, "%s %s :%s", parameters[0].c_str(), (hide_server ? ServerInstance->Config->HideWhoisServer.c_str() : u->server.c_str()), signon.c_str());
  68                         }
  69                 }
  70                 else
  71                 {
  72                         user->WriteNumeric(ERR_WASNOSUCHNICK, "%s :There was no such nickname", parameters[0].c_str());
  73                 }
  74         }
  75
  76         user->WriteNumeric(RPL_ENDOFWHOWAS, "%s :End of WHOWAS", parameters[0].c_str());
  77         return CMD_SUCCESS;
  78 }
  79
  80 std::string CommandWhowas::GetStats()
  81 {
  82         int whowas_size = 0;
  83         int whowas_bytes = 0;
  84         for (whowas_users::iterator i = whowas.begin(); i != whowas.end(); ++i)
  85         {
  86                 whowas_set* n = i->second;
  87                 whowas_size += n->size();
  88                 whowas_bytes += (sizeof(whowas_set) + ( sizeof(WhoWasGroup) * n->size() ) );
  89         }
  90         return "Whowas entries: " +ConvToStr(whowas_size)+" ("+ConvToStr(whowas_bytes)+" bytes)";
  91 }
  92
  93 void CommandWhowas::AddToWhoWas(User* user)
  94 {
  95         /* if whowas disabled */
  96         if (this->GroupSize == 0 || this->MaxGroups == 0)
  97         {
  98                 return;
  99         }
 100
 101         // Insert nick if it doesn't exist
 102         // 'first' will point to the newly inserted element or to the existing element with an equivalent key
 103         std::pair<whowas_users::iterator, bool> ret = whowas.insert(std::make_pair(irc::string(user->nick.c_str()), static_cast<whowas_set*>(NULL)));
 104
 105         if (ret.second) // If inserted
 106         {
 107                 // This nick is new, create a list for it and add the first record to it
 108                 whowas_set* n = new whowas_set;
 109                 n->push_back(new WhoWasGroup(user));
 110                 ret.first->second = n;
 111
 112                 // Add this nick to the fifo too
 113                 whowas_fifo.push_back(std::make_pair(ServerInstance->Time(), ret.first->first));
 114
 115                 if (whowas.size() > this->MaxGroups)
 116                 {
 117                         // Too many nicks, remove the nick which was inserted the longest time ago from both the map and the fifo
 118                         whowas_users::iterator it = whowas.find(whowas_fifo.front().second);
 119                         if (it != whowas.end())
 120                         {
 121                                 whowas_set* set = it->second;
 122                                 for (whowas_set::iterator i = set->begin(); i != set->end(); ++i)
 123                                         delete *i;
 124
 125                                 delete set;
 126                                 whowas.erase(it);
 127                         }
 128                         whowas_fifo.pop_front();
 129                 }
 130         }
 131         else
 132         {
 133                 // We've met this nick before, add a new record to the list
 134                 whowas_set* set = ret.first->second;
 135                 set->push_back(new WhoWasGroup(user));
 136
 137                 // If there are too many records for this nick, remove the oldest (front)
 138                 if (set->size() > this->GroupSize)
 139                 {
 140                         delete set->front();
 141                         set->pop_front();
 142                 }
 143         }
 144 }
 145
 146 /* on rehash, refactor maps according to new conf values */
 147 void CommandWhowas::Prune()
 148 {
 149         time_t min = ServerInstance->Time() - this->MaxKeep;
 150
 151         /* first cut the list to new size (maxgroups) and also prune entries that are timed out. */
 152         while (!whowas_fifo.empty())
 153         {
 154                 if ((whowas_fifo.size() > this->MaxGroups) || (whowas_fifo.front().first < min))
 155                 {
 156                         whowas_users::iterator iter = whowas.find(whowas_fifo.front().second);
 157
 158                         /* hopefully redundant integrity check, but added while debugging r6216 */
 159                         if (iter == whowas.end())
 160                         {
 161                                 /* this should never happen, if it does maps are corrupt */
 162                                 ServerInstance->Logs->Log("WHOWAS", LOG_DEFAULT, "BUG: Whowas maps got corrupted! (1)");
 163                                 return;
 164                         }
 165
 166                         whowas_set* set = iter->second;
 167                         for (whowas_set::iterator i = set->begin(); i != set->end(); ++i)
 168                                 delete *i;
 169
 170                         delete set;
 171                         whowas.erase(iter);
 172                         whowas_fifo.pop_front();
 173                 }
 174                 else
 175                         break;
 176         }
 177
 178         /* Then cut the whowas sets to new size (groupsize) */
 179         for (whowas_users::iterator i = whowas.begin(); i != whowas.end(); ++i)
 180         {
 181                 whowas_set* n = i->second;
 182                 while (n->size() > this->GroupSize)
 183                 {
 184                         delete n->front();
 185                         n->pop_front();
 186                 }
 187         }
 188 }
 189
 190 /* call maintain once an hour to remove expired nicks */
 191 void CommandWhowas::Maintain()
 192 {
 193         time_t min = ServerInstance->Time() - this->MaxKeep;
 194         for (whowas_users::iterator i = whowas.begin(); i != whowas.end(); ++i)
 195         {
 196                 whowas_set* set = i->second;
 197                 while (!set->empty() && set->front()->signon < min)
 198                 {
 199                         delete set->front();
 200                         set->pop_front();
 201                 }
 202         }
 203 }
 204
 205 CommandWhowas::~CommandWhowas()
 206 {
 207         for (whowas_users::iterator i = whowas.begin(); i != whowas.end(); ++i)
 208         {
 209                 whowas_set* set = i->second;
 210                 for (whowas_set::iterator j = set->begin(); j != set->end(); ++j)
 211                         delete *j;
 212
 213                 delete set;
 214         }
 215 }
 216
 217 WhoWasGroup::WhoWasGroup(User* user) : host(user->host), dhost(user->dhost), ident(user->ident),
 218         server(user->server->GetName()), gecos(user->fullname), signon(user->signon)
 219 {
 220 }
 221
 222 class ModuleWhoWas : public Module
 223 {
 224         CommandWhowas cmd;
 225
 226  public:
 227         ModuleWhoWas() : cmd(this)
 228         {
 229         }
 230
 231         void OnGarbageCollect()
 232         {
 233                 // Remove all entries older than MaxKeep
 234                 cmd.Maintain();
 235         }
 236
 237         void OnUserQuit(User* user, const std::string& message, const std::string& oper_message)
 238         {
 239                 cmd.AddToWhoWas(user);
 240         }
 241
 242         ModResult OnStats(char symbol, User* user, string_list &results)
 243         {
 244                 if (symbol == 'z')
 245                         results.push_back("249 "+user->nick+" :"+cmd.GetStats());
 246
 247                 return MOD_RES_PASSTHRU;
 248         }
 249
 250         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 251         {
 252                 ConfigTag* tag = ServerInstance->Config->ConfValue("whowas");
 253                 unsigned int NewGroupSize = tag->getInt("groupsize", 10, 0, 10000);
 254                 unsigned int NewMaxGroups = tag->getInt("maxgroups", 10240, 0, 1000000);
 255                 unsigned int NewMaxKeep = tag->getDuration("maxkeep", 3600, 3600);
 256
 257                 if ((NewGroupSize == cmd.GroupSize) && (NewMaxGroups == cmd.MaxGroups) && (NewMaxKeep == cmd.MaxKeep))
 258                         return;
 259
 260                 cmd.GroupSize = NewGroupSize;
 261                 cmd.MaxGroups = NewMaxGroups;
 262                 cmd.MaxKeep = NewMaxKeep;
 263                 cmd.Prune();
 264         }
 265
 266         Version GetVersion()
 267         {
 268                 return Version("WHOWAS", VF_VENDOR);
 269         }
 270 };
 271
 272 MODULE_INIT(ModuleWhoWas)