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 #include "listmode.h"
  23 #include <fstream>
  24
  25
  26 /** Handles the +P channel mode
  27  */
  28 class PermChannel : public ModeHandler
  29 {
  30  public:
  31         PermChannel(Module* Creator)
  32                 : ModeHandler(Creator, "permanent", 'P', PARAM_NONE, MODETYPE_CHANNEL)
  33         {
  34                 oper = true;
  35         }
  36
  37         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string& parameter, bool adding)
  38         {
  39                 if (adding == channel->IsModeSet(this))
  40                         return MODEACTION_DENY;
  41
  42                 channel->SetMode(this, adding);
  43                 if (!adding)
  44                         channel->CheckDestroy();
  45
  46                 return MODEACTION_ALLOW;
  47         }
  48 };
  49
  50 // Not in a class due to circular dependancy hell.
  51 static std::string permchannelsconf;
  52 static bool WriteDatabase(PermChannel& permchanmode, Module* mod, bool save_listmodes)
  53 {
  54         ChanModeReference ban(mod, "ban");
  55         /*
  56          * We need to perform an atomic write so as not to fuck things up.
  57          * So, let's write to a temporary file, flush it, then rename the file..
  58          *     -- w00t
  59          */
  60
  61         // If the user has not specified a configuration file then we don't write one.
  62         if (permchannelsconf.empty())
  63                 return true;
  64
  65         std::string permchannelsnewconf = permchannelsconf + ".tmp";
  66         std::ofstream stream(permchannelsnewconf.c_str());
  67         if (!stream.is_open())
  68         {
  69                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Cannot create database \"%s\"! %s (%d)", permchannelsnewconf.c_str(), strerror(errno), errno);
  70                 ServerInstance->SNO->WriteToSnoMask('a', "database: cannot create new permchan db \"%s\": %s (%d)", permchannelsnewconf.c_str(), strerror(errno), errno);
  71                 return false;
  72         }
  73
  74         stream << "# This file is automatically generated by m_permchannels. Any changes will be overwritten." << std::endl
  75                 << "<config format=\"xml\">" << std::endl;
  76
  77         const chan_hash& chans = ServerInstance->GetChans();
  78         for (chan_hash::const_iterator i = chans.begin(); i != chans.end(); ++i)
  79         {
  80                 Channel* chan = i->second;
  81                 if (!chan->IsModeSet(permchanmode))
  82                         continue;
  83
  84                 std::string chanmodes = chan->ChanModes(true);
  85                 if (save_listmodes)
  86                 {
  87                         std::string modes;
  88                         std::string params;
  89
  90                         const ModeParser::ListModeList& listmodes = ServerInstance->Modes->GetListModes();
  91                         for (ModeParser::ListModeList::const_iterator j = listmodes.begin(); j != listmodes.end(); ++j)
  92                         {
  93                                 ListModeBase* lm = *j;
  94                                 ListModeBase::ModeList* list = lm->GetList(chan);
  95                                 if (!list || list->empty())
  96                                         continue;
  97
  98                                 size_t n = 0;
  99                                 // Append the parameters
 100                                 for (ListModeBase::ModeList::const_iterator k = list->begin(); k != list->end(); ++k, n++)
 101                                 {
 102                                         params += k->mask;
 103                                         params += ' ';
 104                                 }
 105
 106                                 // Append the mode letters (for example "IIII", "gg")
 107                                 modes.append(n, lm->GetModeChar());
 108                         }
 109
 110                         if (!params.empty())
 111                         {
 112                                 // Remove the last space
 113                                 params.erase(params.end()-1);
 114
 115                                 // If there is at least a space in chanmodes (that is, a non-listmode has a parameter)
 116                                 // insert the listmode mode letters before the space. Otherwise just append them.
 117                                 std::string::size_type p = chanmodes.find(' ');
 118                                 if (p == std::string::npos)
 119                                         chanmodes += modes;
 120                                 else
 121                                         chanmodes.insert(p, modes);
 122
 123                                 // Append the listmode parameters (the masks themselves)
 124                                 chanmodes += ' ';
 125                                 chanmodes += params;
 126                         }
 127                 }
 128
 129                 stream << "<permchannels channel=\"" << ServerConfig::Escape(chan->name)
 130                         << "\" ts=\"" << chan->age
 131                         << "\" topic=\"" << ServerConfig::Escape(chan->topic)
 132                         << "\" topicts=\"" << chan->topicset
 133                         << "\" topicsetby=\"" << ServerConfig::Escape(chan->setby)
 134                         << "\" modes=\"" << ServerConfig::Escape(chanmodes)
 135                         << "\">" << std::endl;
 136         }
 137
 138         if (stream.fail())
 139         {
 140                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Cannot write to new database \"%s\"! %s (%d)", permchannelsnewconf.c_str(), strerror(errno), errno);
 141                 ServerInstance->SNO->WriteToSnoMask('a', "database: cannot write to new permchan db \"%s\": %s (%d)", permchannelsnewconf.c_str(), strerror(errno), errno);
 142                 return false;
 143         }
 144         stream.close();
 145
 146 #ifdef _WIN32
 147         remove(permchannelsconf.c_str());
 148 #endif
 149         // Use rename to move temporary to new db - this is guarenteed not to fuck up, even in case of a crash.
 150         if (rename(permchannelsnewconf.c_str(), permchannelsconf.c_str()) < 0)
 151         {
 152                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Cannot replace old database \"%s\" with new database \"%s\"! %s (%d)", permchannelsconf.c_str(), permchannelsnewconf.c_str(), strerror(errno), errno);
 153                 ServerInstance->SNO->WriteToSnoMask('a', "database: cannot replace old permchan db \"%s\" with new db \"%s\": %s (%d)", permchannelsconf.c_str(), permchannelsnewconf.c_str(), strerror(errno), errno);
 154                 return false;
 155         }
 156
 157         return true;
 158 }
 159
 160 class ModulePermanentChannels : public Module
 161 {
 162         PermChannel p;
 163         bool dirty;
 164         bool loaded;
 165         bool save_listmodes;
 166 public:
 167
 168         ModulePermanentChannels()
 169                 : p(this), dirty(false), loaded(false)
 170         {
 171         }
 172
 173         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 174         {
 175                 ConfigTag* tag = ServerInstance->Config->ConfValue("permchanneldb");
 176                 permchannelsconf = tag->getString("filename");
 177                 save_listmodes = tag->getBool("listmodes");
 178
 179                 if (!permchannelsconf.empty())
 180                         permchannelsconf = ServerInstance->Config->Paths.PrependConfig(permchannelsconf);
 181         }
 182
 183         void LoadDatabase()
 184         {
 185                 /*
 186                  * Process config-defined list of permanent channels.
 187                  * -- w00t
 188                  */
 189                 ConfigTagList permchannels = ServerInstance->Config->ConfTags("permchannels");
 190                 for (ConfigIter i = permchannels.first; i != permchannels.second; ++i)
 191                 {
 192                         ConfigTag* tag = i->second;
 193                         std::string channel = tag->getString("channel");
 194                         std::string modes = tag->getString("modes");
 195
 196                         if ((channel.empty()) || (channel.length() > ServerInstance->Config->Limits.ChanMax))
 197                         {
 198                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring permchannels tag with empty or too long channel name (\"" + channel + "\")");
 199                                 continue;
 200                         }
 201
 202                         Channel *c = ServerInstance->FindChan(channel);
 203
 204                         if (!c)
 205                         {
 206                                 time_t TS = tag->getInt("ts", ServerInstance->Time(), 1);
 207                                 c = new Channel(channel, TS);
 208
 209                                 unsigned int topicset = tag->getInt("topicts");
 210                                 c->topic = tag->getString("topic");
 211
 212                                 if ((topicset != 0) || (!c->topic.empty()))
 213                                 {
 214                                         if (topicset == 0)
 215                                                 topicset = ServerInstance->Time();
 216                                         c->topicset = topicset;
 217                                         c->setby = tag->getString("topicsetby");
 218                                         if (c->setby.empty())
 219                                                 c->setby = ServerInstance->Config->ServerName;
 220                                 }
 221
 222                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Added %s with topic %s", channel.c_str(), c->topic.c_str());
 223
 224                                 if (modes.empty())
 225                                         continue;
 226
 227                                 irc::spacesepstream list(modes);
 228                                 std::string modeseq;
 229                                 std::string par;
 230
 231                                 list.GetToken(modeseq);
 232
 233                                 // XXX bleh, should we pass this to the mode parser instead? ugly. --w00t
 234                                 for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 235                                 {
 236                                         ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 237                                         if (mode)
 238                                         {
 239                                                 if (mode->GetNumParams(true))
 240                                                         list.GetToken(par);
 241                                                 else
 242                                                         par.clear();
 243
 244                                                 mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true);
 245                                         }
 246                                 }
 247                         }
 248                 }
 249         }
 250
 251         ModResult OnRawMode(User* user, Channel* chan, ModeHandler* mh, const std::string& param, bool adding) CXX11_OVERRIDE
 252         {
 253                 if (chan && (chan->IsModeSet(p) || mh == &p))
 254                         dirty = true;
 255
 256                 return MOD_RES_PASSTHRU;
 257         }
 258
 259         void OnPostTopicChange(User*, Channel *c, const std::string&) CXX11_OVERRIDE
 260         {
 261                 if (c->IsModeSet(p))
 262                         dirty = true;
 263         }
 264
 265         void OnBackgroundTimer(time_t) CXX11_OVERRIDE
 266         {
 267                 if (dirty)
 268                         WriteDatabase(p, this, save_listmodes);
 269                 dirty = false;
 270         }
 271
 272         void Prioritize()
 273         {
 274                 // XXX: Load the DB here because the order in which modules are init()ed at boot is
 275                 // alphabetical, this means we must wait until all modules have done their init()
 276                 // to be able to set the modes they provide (e.g.: m_stripcolor is inited after us)
 277                 // Prioritize() is called after all module initialization is complete, consequently
 278                 // all modes are available now
 279                 if (loaded)
 280                         return;
 281
 282                 loaded = true;
 283
 284                 // Load only when there are no linked servers - we set the TS of the channels we
 285                 // create to the current time, this can lead to desync because spanningtree has
 286                 // no way of knowing what we do
 287                 ProtocolInterface::ServerList serverlist;
 288                 ServerInstance->PI->GetServerList(serverlist);
 289                 if (serverlist.size() < 2)
 290                 {
 291                         try
 292                         {
 293                                 LoadDatabase();
 294                         }
 295                         catch (CoreException& e)
 296                         {
 297                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Error loading permchannels database: " + std::string(e.GetReason()));
 298                         }
 299                 }
 300         }
 301
 302         Version GetVersion() CXX11_OVERRIDE
 303         {
 304                 return Version("Provides support for channel mode +P to provide permanent channels",VF_VENDOR);
 305         }
 306
 307         ModResult OnChannelPreDelete(Channel *c) CXX11_OVERRIDE
 308         {
 309                 if (c->IsModeSet(p))
 310                         return MOD_RES_DENY;
 311
 312                 return MOD_RES_PASSTHRU;
 313         }
 314 };
 315
 316 MODULE_INIT(ModulePermanentChannels)