src/modules/m_permchannels.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008-2009 Robin Burchell <robin+git@viroteck.net>
   6  *
   7  * This file is part of InspIRCd.  InspIRCd is free software: you can
   8  * redistribute it and/or modify it under the terms of the GNU General Public
   9  * License as published by the Free Software Foundation, version 2.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14  * details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include "inspircd.h"
  22
  23 /* $ModDesc: Provides support for channel mode +P to provide permanent channels */
  24
  25 struct ListModeData
  26 {
  27         std::string modes;
  28         std::string params;
  29 };
  30
  31 // Not in a class due to circular dependancy hell.
  32 static std::string permchannelsconf;
  33 static bool WriteDatabase(Module* mod, bool save_listmodes)
  34 {
  35         FILE *f;
  36
  37         if (permchannelsconf.empty())
  38         {
  39                 // Fake success.
  40                 return true;
  41         }
  42
  43         std::string tempname = permchannelsconf + ".tmp";
  44
  45         /*
  46          * We need to perform an atomic write so as not to fuck things up.
  47          * So, let's write to a temporary file, flush and sync the FD, then rename the file..
  48          *              -- w00t
  49          */
  50         f = fopen(tempname.c_str(), "w");
  51         if (!f)
  52         {
  53                 ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot create database! %s (%d)", strerror(errno), errno);
  54                 ServerInstance->SNO->WriteToSnoMask('a', "database: cannot create new db: %s (%d)", strerror(errno), errno);
  55                 return false;
  56         }
  57
  58         fputs("# Permchannels DB\n# This file is autogenerated; any changes will be overwritten!\n<config format=\"compat\">\n", f);
  59         // Now, let's write.
  60         std::string line;
  61         for (chan_hash::const_iterator i = ServerInstance->chanlist->begin(); i != ServerInstance->chanlist->end(); i++)
  62         {
  63                 Channel* chan = i->second;
  64                 if (!chan->IsModeSet('P'))
  65                         continue;
  66
  67                 std::string chanmodes = chan->ChanModes(true);
  68                 if (save_listmodes)
  69                 {
  70                         ListModeData lm;
  71
  72                         // Bans are managed by the core, so we have to process them separately
  73                         lm.modes = std::string(chan->bans.size(), 'b');
  74                         for (BanList::const_iterator j = chan->bans.begin(); j != chan->bans.end(); ++j)
  75                         {
  76                                 lm.params += j->data;
  77                                 lm.params += ' ';
  78                         }
  79
  80                         // All other listmodes are managed by modules, so we need to ask them (call their
  81                         // OnSyncChannel() handler) to give our ProtoSendMode() a list of modes that are
  82                         // set on the channel. The ListModeData struct is passed as an opaque pointer
  83                         // that will be passed back to us by the module handling the mode.
  84                         FOREACH_MOD(I_OnSyncChannel, OnSyncChannel(chan, mod, &lm));
  85
  86                         if (!lm.modes.empty())
  87                         {
  88                                 // Remove the last space
  89                                 lm.params.erase(lm.params.end()-1);
  90
  91                                 // If there is at least a space in chanmodes (that is, a non-listmode has a parameter)
  92                                 // insert the listmode mode letters before the space. Otherwise just append them.
  93                                 std::string::size_type p = chanmodes.find(' ');
  94                                 if (p == std::string::npos)
  95                                         chanmodes += lm.modes;
  96                                 else
  97                                         chanmodes.insert(p, lm.modes);
  98
  99                                 // Append the listmode parameters (the masks themselves)
 100                                 chanmodes += ' ';
 101                                 chanmodes += lm.params;
 102                         }
 103                 }
 104
 105                 std::string chants = ConvToStr(chan->age);
 106                 std::string topicts = ConvToStr(chan->topicset);
 107                 const char* items[] =
 108                 {
 109                         "<permchannels channel=",
 110                         chan->name.c_str(),
 111                         " ts=",
 112                         chants.c_str(),
 113                         " topic=",
 114                         chan->topic.c_str(),
 115                         " topicts=",
 116                         topicts.c_str(),
 117                         " topicsetby=",
 118                         chan->setby.c_str(),
 119                         " modes=",
 120                         chanmodes.c_str(),
 121                         ">\n"
 122                 };
 123
 124                 line.clear();
 125                 int item = 0, ipos = 0;
 126                 while (item < 13)
 127                 {
 128                         char c = items[item][ipos++];
 129                         if (c == 0)
 130                         {
 131                                 // end of this string; hop to next string, insert a quote
 132                                 item++;
 133                                 ipos = 0;
 134                                 c = '"';
 135                         }
 136                         else if (c == '\\' || c == '"')
 137                         {
 138                                 line += '\\';
 139                         }
 140                         line += c;
 141                 }
 142
 143                 // Erase last '"'
 144                 line.erase(line.end()-1);
 145                 fputs(line.c_str(), f);
 146         }
 147
 148         int write_error = 0;
 149         write_error = ferror(f);
 150         write_error |= fclose(f);
 151         if (write_error)
 152         {
 153                 ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot write to new database! %s (%d)", strerror(errno), errno);
 154                 ServerInstance->SNO->WriteToSnoMask('a', "database: cannot write to new db: %s (%d)", strerror(errno), errno);
 155                 return false;
 156         }
 157
 158 #ifdef _WIN32
 159         remove(permchannelsconf.c_str());
 160 #endif
 161         // Use rename to move temporary to new db - this is guarenteed not to fuck up, even in case of a crash.
 162         if (rename(tempname.c_str(), permchannelsconf.c_str()) < 0)
 163         {
 164                 ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot move new to old database! %s (%d)", strerror(errno), errno);
 165                 ServerInstance->SNO->WriteToSnoMask('a', "database: cannot replace old with new db: %s (%d)", strerror(errno), errno);
 166                 return false;
 167         }
 168
 169         return true;
 170 }
 171
 172
 173
 174 /** Handles the +P channel mode
 175  */
 176 class PermChannel : public ModeHandler
 177 {
 178  public:
 179         PermChannel(Module* Creator) : ModeHandler(Creator, "permanent", 'P', PARAM_NONE, MODETYPE_CHANNEL) { oper = true; }
 180
 181         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
 182         {
 183                 if (adding)
 184                 {
 185                         if (!channel->IsModeSet('P'))
 186                         {
 187                                 channel->SetMode('P',true);
 188                                 return MODEACTION_ALLOW;
 189                         }
 190                 }
 191                 else
 192                 {
 193                         if (channel->IsModeSet('P'))
 194                         {
 195                                 channel->SetMode(this,false);
 196                                 if (channel->GetUserCounter() == 0)
 197                                 {
 198                                         channel->DelUser(ServerInstance->FakeClient);
 199                                 }
 200                                 return MODEACTION_ALLOW;
 201                         }
 202                 }
 203
 204                 return MODEACTION_DENY;
 205         }
 206 };
 207
 208 class ModulePermanentChannels : public Module
 209 {
 210         PermChannel p;
 211         bool dirty;
 212         bool loaded;
 213         bool save_listmodes;
 214 public:
 215
 216         ModulePermanentChannels()
 217                 : p(this), dirty(false), loaded(false)
 218         {
 219         }
 220
 221         void init()
 222         {
 223                 ServerInstance->Modules->AddService(p);
 224                 Implementation eventlist[] = { I_OnChannelPreDelete, I_OnPostTopicChange, I_OnRawMode, I_OnRehash, I_OnBackgroundTimer };
 225                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 226
 227                 OnRehash(NULL);
 228         }
 229
 230         CullResult cull()
 231         {
 232                 /*
 233                  * DelMode can't remove the +P mode on empty channels, or it will break
 234                  * merging modes with remote servers. Remove the empty channels now as
 235                  * we know this is not the case.
 236                  */
 237                 chan_hash::iterator iter = ServerInstance->chanlist->begin();
 238                 while (iter != ServerInstance->chanlist->end())
 239                 {
 240                         Channel* c = iter->second;
 241                         if (c->GetUserCounter() == 0)
 242                         {
 243                                 chan_hash::iterator at = iter;
 244                                 iter++;
 245                                 FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(c));
 246                                 ServerInstance->chanlist->erase(at);
 247                                 ServerInstance->GlobalCulls.AddItem(c);
 248                         }
 249                         else
 250                                 iter++;
 251                 }
 252                 ServerInstance->Modes->DelMode(&p);
 253                 return Module::cull();
 254         }
 255
 256         virtual void OnRehash(User *user)
 257         {
 258                 ConfigTag* tag = ServerInstance->Config->ConfValue("permchanneldb");
 259                 permchannelsconf = tag->getString("filename");
 260                 save_listmodes = tag->getBool("listmodes");
 261         }
 262
 263         void LoadDatabase()
 264         {
 265                 /*
 266                  * Process config-defined list of permanent channels.
 267                  * -- w00t
 268                  */
 269                 ConfigTagList permchannels = ServerInstance->Config->ConfTags("permchannels");
 270                 for (ConfigIter i = permchannels.first; i != permchannels.second; ++i)
 271                 {
 272                         ConfigTag* tag = i->second;
 273                         std::string channel = tag->getString("channel");
 274                         std::string topic = tag->getString("topic");
 275                         std::string modes = tag->getString("modes");
 276
 277                         if ((channel.empty()) || (channel.length() > ServerInstance->Config->Limits.ChanMax))
 278                         {
 279                                 ServerInstance->Logs->Log("m_permchannels", DEFAULT, "Ignoring permchannels tag with empty or too long channel name (\"" + channel + "\")");
 280                                 continue;
 281                         }
 282
 283                         Channel *c = ServerInstance->FindChan(channel);
 284
 285                         if (!c)
 286                         {
 287                                 time_t TS = tag->getInt("ts");
 288                                 c = new Channel(channel, ((TS > 0) ? TS : ServerInstance->Time()));
 289
 290                                 c->SetTopic(NULL, topic, true);
 291                                 c->setby = tag->getString("topicsetby");
 292                                 if (c->setby.empty())
 293                                         c->setby = ServerInstance->Config->ServerName;
 294                                 unsigned int topicset = tag->getInt("topicts");
 295                                 // SetTopic() sets the topic TS to now, if there was no topicts saved then don't overwrite that with a 0
 296                                 if (topicset > 0)
 297                                         c->topicset = topicset;
 298
 299                                 ServerInstance->Logs->Log("m_permchannels", DEBUG, "Added %s with topic %s", channel.c_str(), topic.c_str());
 300
 301                                 if (modes.empty())
 302                                         continue;
 303
 304                                 irc::spacesepstream list(modes);
 305                                 std::string modeseq;
 306                                 std::string par;
 307
 308                                 list.GetToken(modeseq);
 309
 310                                 // XXX bleh, should we pass this to the mode parser instead? ugly. --w00t
 311                                 for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 312                                 {
 313                                         ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 314                                         if (mode)
 315                                         {
 316                                                 if (mode->GetNumParams(true))
 317                                                         list.GetToken(par);
 318                                                 else
 319                                                         par.clear();
 320
 321                                                 mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true);
 322                                         }
 323                                 }
 324                         }
 325                 }
 326         }
 327
 328         virtual ModResult OnRawMode(User* user, Channel* chan, const char mode, const std::string &param, bool adding, int pcnt)
 329         {
 330                 if (chan && (chan->IsModeSet('P') || mode == 'P'))
 331                         dirty = true;
 332
 333                 return MOD_RES_PASSTHRU;
 334         }
 335
 336         virtual void OnPostTopicChange(User*, Channel *c, const std::string&)
 337         {
 338                 if (c->IsModeSet('P'))
 339                         dirty = true;
 340         }
 341
 342         void OnBackgroundTimer(time_t)
 343         {
 344                 if (dirty)
 345                         WriteDatabase(this, save_listmodes);
 346                 dirty = false;
 347         }
 348
 349         void Prioritize()
 350         {
 351                 // XXX: Load the DB here because the order in which modules are init()ed at boot is
 352                 // alphabetical, this means we must wait until all modules have done their init()
 353                 // to be able to set the modes they provide (e.g.: m_stripcolor is inited after us)
 354                 // Prioritize() is called after all module initialization is complete, consequently
 355                 // all modes are available now
 356                 if (loaded)
 357                         return;
 358
 359                 loaded = true;
 360
 361                 // Load only when there are no linked servers - we set the TS of the channels we
 362                 // create to the current time, this can lead to desync because spanningtree has
 363                 // no way of knowing what we do
 364                 ProtoServerList serverlist;
 365                 ServerInstance->PI->GetServerList(serverlist);
 366                 if (serverlist.size() < 2)
 367                 {
 368                         try
 369                         {
 370                                 LoadDatabase();
 371                         }
 372                         catch (CoreException& e)
 373                         {
 374                                 ServerInstance->Logs->Log("m_permchannels", DEFAULT, "Error loading permchannels database: " + std::string(e.GetReason()));
 375                         }
 376                 }
 377         }
 378
 379         void ProtoSendMode(void* opaque, TargetTypeFlags type, void* target, const std::vector<std::string>& modes, const std::vector<TranslateType>& translate)
 380         {
 381                 // We never pass an empty modelist but better be sure
 382                 if (modes.empty())
 383                         return;
 384
 385                 ListModeData* lm = static_cast<ListModeData*>(opaque);
 386
 387                 // Append the mode letters without the trailing '+' (for example "IIII", "gg")
 388                 lm->modes.append(modes[0].begin()+1, modes[0].end());
 389
 390                 // Append the parameters
 391                 for (std::vector<std::string>::const_iterator i = modes.begin()+1; i != modes.end(); ++i)
 392                 {
 393                         lm->params += *i;
 394                         lm->params += ' ';
 395                 }
 396         }
 397
 398         virtual Version GetVersion()
 399         {
 400                 return Version("Provides support for channel mode +P to provide permanent channels",VF_VENDOR);
 401         }
 402
 403         virtual ModResult OnChannelPreDelete(Channel *c)
 404         {
 405                 if (c->IsModeSet('P'))
 406                         return MOD_RES_DENY;
 407
 408                 return MOD_RES_PASSTHRU;
 409         }
 410 };
 411
 412 MODULE_INIT(ModulePermanentChannels)