/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2009-2010 Daniel De Graaf * Copyright (C) 2008-2009 Robin Burchell * * This file is part of InspIRCd. InspIRCd is free software: you can * redistribute it and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "inspircd.h" /* $ModDesc: Provides support for channel mode +P to provide permanent channels */ struct ListModeData { std::string modes; std::string params; }; // Not in a class due to circular dependancy hell. static std::string permchannelsconf; static bool WriteDatabase(Module* mod, bool save_listmodes) { FILE *f; if (permchannelsconf.empty()) { // Fake success. return true; } std::string tempname = permchannelsconf + ".tmp"; /* * We need to perform an atomic write so as not to fuck things up. * So, let's write to a temporary file, flush and sync the FD, then rename the file.. * -- w00t */ f = fopen(tempname.c_str(), "w"); if (!f) { ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot create database! %s (%d)", strerror(errno), errno); ServerInstance->SNO->WriteToSnoMask('a', "database: cannot create new db: %s (%d)", strerror(errno), errno); return false; } fputs("# Permchannels DB\n# This file is autogenerated; any changes will be overwritten!\n\n", f); // Now, let's write. std::string line; for (chan_hash::const_iterator i = ServerInstance->chanlist->begin(); i != ServerInstance->chanlist->end(); i++) { Channel* chan = i->second; if (!chan->IsModeSet('P')) continue; std::string chanmodes = chan->ChanModes(true); if (save_listmodes) { ListModeData lm; // Bans are managed by the core, so we have to process them separately lm.modes = std::string(chan->bans.size(), 'b'); for (BanList::const_iterator j = chan->bans.begin(); j != chan->bans.end(); ++j) { lm.params += j->data; lm.params += ' '; } // All other listmodes are managed by modules, so we need to ask them (call their // OnSyncChannel() handler) to give our ProtoSendMode() a list of modes that are // set on the channel. The ListModeData struct is passed as an opaque pointer // that will be passed back to us by the module handling the mode. FOREACH_MOD(I_OnSyncChannel, OnSyncChannel(chan, mod, &lm)); if (!lm.modes.empty()) { // Remove the last space lm.params.erase(lm.params.end()-1); // If there is at least a space in chanmodes (that is, a non-listmode has a parameter) // insert the listmode mode letters before the space. Otherwise just append them. std::string::size_type p = chanmodes.find(' '); if (p == std::string::npos) chanmodes += lm.modes; else chanmodes.insert(p, lm.modes); // Append the listmode parameters (the masks themselves) chanmodes += ' '; chanmodes += lm.params; } } std::string chants = ConvToStr(chan->age); std::string topicts = ConvToStr(chan->topicset); const char* items[] = { "\n" }; line.clear(); int item = 0, ipos = 0; while (item < 13) { char c = items[item][ipos++]; if (c == 0) { // end of this string; hop to next string, insert a quote item++; ipos = 0; c = '"'; } else if (c == '\\' || c == '"') { line += '\\'; } line += c; } // Erase last '"' line.erase(line.end()-1); fputs(line.c_str(), f); } int write_error = 0; write_error = ferror(f); write_error |= fclose(f); if (write_error) { ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot write to new database! %s (%d)", strerror(errno), errno); ServerInstance->SNO->WriteToSnoMask('a', "database: cannot write to new db: %s (%d)", strerror(errno), errno); return false; } #ifdef _WIN32 if (remove(permchannelsconf.c_str())) { ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot remove old database! %s (%d)", strerror(errno), errno); ServerInstance->SNO->WriteToSnoMask('a', "database: cannot remove old database: %s (%d)", strerror(errno), errno); return false; } #endif // Use rename to move temporary to new db - this is guarenteed not to fuck up, even in case of a crash. if (rename(tempname.c_str(), permchannelsconf.c_str()) < 0) { ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot move new to old database! %s (%d)", strerror(errno), errno); ServerInstance->SNO->WriteToSnoMask('a', "database: cannot replace old with new db: %s (%d)", strerror(errno), errno); return false; } return true; } /** Handles the +P channel mode */ class PermChannel : public ModeHandler { public: PermChannel(Module* Creator) : ModeHandler(Creator, "permanent", 'P', PARAM_NONE, MODETYPE_CHANNEL) { oper = true; } ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding) { if (adding) { if (!channel->IsModeSet('P')) { channel->SetMode('P',true); return MODEACTION_ALLOW; } } else { if (channel->IsModeSet('P')) { channel->SetMode(this,false); if (channel->GetUserCounter() == 0) { channel->DelUser(ServerInstance->FakeClient); } return MODEACTION_ALLOW; } } return MODEACTION_DENY; } }; class ModulePermanentChannels : public Module { PermChannel p; bool dirty; bool save_listmodes; public: ModulePermanentChannels() : p(this), dirty(false) { } void init() { ServerInstance->Modules->AddService(p); Implementation eventlist[] = { I_OnChannelPreDelete, I_OnPostTopicChange, I_OnRawMode, I_OnRehash, I_OnBackgroundTimer }; ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation)); OnRehash(NULL); } CullResult cull() { /* * DelMode can't remove the +P mode on empty channels, or it will break * merging modes with remote servers. Remove the empty channels now as * we know this is not the case. */ chan_hash::iterator iter = ServerInstance->chanlist->begin(); while (iter != ServerInstance->chanlist->end()) { Channel* c = iter->second; if (c->GetUserCounter() == 0) { chan_hash::iterator at = iter; iter++; FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(c)); ServerInstance->chanlist->erase(at); ServerInstance->GlobalCulls.AddItem(c); } else iter++; } ServerInstance->Modes->DelMode(&p); return Module::cull(); } virtual void OnRehash(User *user) { ConfigTag* tag = ServerInstance->Config->ConfValue("permchanneldb"); permchannelsconf = tag->getString("filename"); save_listmodes = tag->getBool("listmodes"); } void LoadDatabase() { /* * Process config-defined list of permanent channels. * -- w00t */ ConfigTagList permchannels = ServerInstance->Config->ConfTags("permchannels"); for (ConfigIter i = permchannels.first; i != permchannels.second; ++i) { ConfigTag* tag = i->second; std::string channel = tag->getString("channel"); std::string topic = tag->getString("topic"); std::string modes = tag->getString("modes"); if ((channel.empty()) || (channel.length() > ServerInstance->Config->Limits.ChanMax)) { ServerInstance->Logs->Log("m_permchannels", DEFAULT, "Ignoring permchannels tag with empty or too long channel name (\"" + channel + "\")"); continue; } Channel *c = ServerInstance->FindChan(channel); if (!c) { time_t TS = tag->getInt("ts"); c = new Channel(channel, ((TS > 0) ? TS : ServerInstance->Time())); c->SetTopic(NULL, topic, true); c->setby = tag->getString("topicsetby"); unsigned int topicset = tag->getInt("topicts"); // SetTopic() sets the topic TS to now, if there was no topicts saved then don't overwrite that with a 0 if (topicset > 0) c->topicset = topicset; ServerInstance->Logs->Log("m_permchannels", DEBUG, "Added %s with topic %s", channel.c_str(), topic.c_str()); if (modes.empty()) continue; irc::spacesepstream list(modes); std::string modeseq; std::string par; list.GetToken(modeseq); // XXX bleh, should we pass this to the mode parser instead? ugly. --w00t for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n) { ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL); if (mode) { if (mode->GetNumParams(true)) list.GetToken(par); else par.clear(); mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true); } } } } } virtual ModResult OnRawMode(User* user, Channel* chan, const char mode, const std::string ¶m, bool adding, int pcnt) { if (chan && (chan->IsModeSet('P') || mode == 'P')) dirty = true; return MOD_RES_PASSTHRU; } virtual void OnPostTopicChange(User*, Channel *c, const std::string&) { if (c->IsModeSet('P')) dirty = true; } void OnBackgroundTimer(time_t) { if (dirty) WriteDatabase(this, save_listmodes); dirty = false; } void Prioritize() { // XXX: Load the DB here because the order in which modules are init()ed at boot is // alphabetical, this means we must wait until all modules have done their init() // to be able to set the modes they provide (e.g.: m_stripcolor is inited after us) // Prioritize() is called after all module initialization is complete, consequently // all modes are available now static bool loaded = false; if (loaded) return; loaded = true; // Load only when there are no linked servers - we set the TS of the channels we // create to the current time, this can lead to desync because spanningtree has // no way of knowing what we do ProtoServerList serverlist; ServerInstance->PI->GetServerList(serverlist); if (serverlist.size() < 2) { try { LoadDatabase(); } catch (CoreException& e) { ServerInstance->Logs->Log("m_permchannels", DEFAULT, "Error loading permchannels database: " + std::string(e.GetReason())); } } } void ProtoSendMode(void* opaque, TargetTypeFlags type, void* target, const std::vector& modes, const std::vector& translate) { // We never pass an empty modelist but better be sure if (modes.empty()) return; ListModeData* lm = static_cast(opaque); // Append the mode letters without the trailing '+' (for example "IIII", "gg") lm->modes.append(modes[0].begin()+1, modes[0].end()); // Append the parameters for (std::vector::const_iterator i = modes.begin()+1; i != modes.end(); ++i) { lm->params += *i; lm->params += ' '; } } virtual Version GetVersion() { return Version("Provides support for channel mode +P to provide permanent channels",VF_VENDOR); } virtual ModResult OnChannelPreDelete(Channel *c) { if (c->IsModeSet('P')) return MOD_RES_DENY; return MOD_RES_PASSTHRU; } }; MODULE_INIT(ModulePermanentChannels)