/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2008 Thomas Stagner * Copyright (C) 2008 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" #include "xline.h" /* $ModConfig: * Specify the filename for the xline database here*/ /* $ModDesc: Keeps a dynamic log of all XLines created, and stores them in a seperate conf file (xline.db). */ class ModuleXLineDB : public Module { std::vector xlines; bool reading_db; // If this is true, addlines are as a result of db reading, so don't bother flushing the db to disk. // DO REMEMBER TO SET IT, otherwise it's annoying :P std::string xlinedbpath; public: ModuleXLineDB() { Implementation eventlist[] = { I_OnAddLine, I_OnDelLine, I_OnExpireLine }; ServerInstance->Modules->Attach(eventlist, this, 3); /* Load the configuration * Note: * this is on purpose not in the OnRehash() method. It would be non-trivial to change the database on-the-fly. * Imagine a scenario where the new file already exists. Merging the current XLines with the existing database is likely a bad idea * ...and so is discarding all current in-memory XLines for the ones in the database. */ ConfigTag* Conf = ServerInstance->Config->ConfValue("xlinedb"); xlinedbpath = Conf->getString("filename", DATA_PATH "/xline.db"); reading_db = true; ReadDatabase(); reading_db = false; } virtual ~ModuleXLineDB() { } /** Called whenever an xline is added by a local user. * This method is triggered after the line is added. * @param source The sender of the line or NULL for local server * @param line The xline being added */ void OnAddLine(User* source, XLine* line) { ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Adding a line"); xlines.push_back(line); if (!reading_db) { WriteDatabase(); } } /** Called whenever an xline is deleted. * This method is triggered after the line is deleted. * @param source The user removing the line or NULL for local server * @param line the line being deleted */ void OnDelLine(User* source, XLine* line) { RemoveLine(line); } void OnExpireLine(XLine *line) { RemoveLine(line); } void RemoveLine(XLine *line) { ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Removing a line"); for (std::vector::iterator i = xlines.begin(); i != xlines.end(); i++) { if ((*i) == line) { xlines.erase(i); break; } } WriteDatabase(); } bool WriteDatabase() { FILE *f; /* * 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.. * Technically, that means that this can block, but I have *never* seen that. * -- w00t */ ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Opening temporary database"); std::string xlinenewdbpath = xlinedbpath + ".new"; f = fopen(xlinenewdbpath.c_str(), "w"); if (!f) { ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Cannot create database! %s (%d)", strerror(errno), errno); ServerInstance->SNO->WriteToSnoMask('a', "database: cannot create new db: %s (%d)", strerror(errno), errno); return false; } ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Opened. Writing.."); /* * Now, much as I hate writing semi-unportable formats, additional * xline types may not have a conf tag, so let's just write them. * In addition, let's use a file version, so we can maintain some * semblance of backwards compatibility for reading on startup.. * -- w00t */ fprintf(f, "VERSION 1\n"); // Now, let's write. XLine *line; for (std::vector::iterator i = xlines.begin(); i != xlines.end(); i++) { line = (*i); fprintf(f, "LINE %s %s %s %lu %lu :%s\n", line->type.c_str(), line->Displayable(), ServerInstance->Config->ServerName.c_str(), (unsigned long)line->set_time, (unsigned long)line->duration, line->reason.c_str()); } ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Finished writing XLines. Checking for error.."); int write_error = 0; write_error = ferror(f); write_error |= fclose(f); if (write_error) { ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: 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(xlinedbpath.c_str())) { ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: 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(xlinenewdbpath.c_str(), xlinedbpath.c_str()) < 0) { ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: 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; } bool ReadDatabase() { FILE *f; char linebuf[MAXBUF]; unsigned int lineno = 0; f = fopen(xlinedbpath.c_str(), "r"); if (!f) { if (errno == ENOENT) { /* xline.db doesn't exist, fake good return value (we don't care about this) */ return true; } else { /* this might be slightly more problematic. */ ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Cannot read database! %s (%d)", strerror(errno), errno); ServerInstance->SNO->WriteToSnoMask('a', "database: cannot read db: %s (%d)", strerror(errno), errno); return false; } } while (fgets(linebuf, MAXBUF, f)) { char *c = linebuf; while (c && *c) { if (*c == '\n') { *c = '\0'; } c++; } // Smart man might think of initing to 1, and moving this to the bottom. Don't. We use continue in this loop. lineno++; // Inspired by the command parser. :) irc::tokenstream tokens(linebuf); int items = 0; std::string command_p[MAXPARAMETERS]; std::string tmp; while (tokens.GetToken(tmp) && (items < MAXPARAMETERS)) { command_p[items] = tmp; items++; } ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Processing %s", linebuf); if (command_p[0] == "VERSION") { if (command_p[1] == "1") { ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: Reading db version %s", command_p[1].c_str()); } else { fclose(f); ServerInstance->Logs->Log("m_xline_db",DEBUG, "xlinedb: I got database version %s - I don't understand it", command_p[1].c_str()); ServerInstance->SNO->WriteToSnoMask('a', "database: I got a database version (%s) I don't understand", command_p[1].c_str()); return false; } } else if (command_p[0] == "LINE") { // Mercilessly stolen from spanningtree XLineFactory* xlf = ServerInstance->XLines->GetFactory(command_p[1]); if (!xlf) { ServerInstance->SNO->WriteToSnoMask('a', "database: Unknown line type (%s).", command_p[1].c_str()); continue; } XLine* xl = xlf->Generate(ServerInstance->Time(), atoi(command_p[5].c_str()), command_p[3], command_p[6], command_p[2]); xl->SetCreateTime(atoi(command_p[4].c_str())); if (ServerInstance->XLines->AddLine(xl, NULL)) { ServerInstance->SNO->WriteToSnoMask('x', "database: Added a line of type %s", command_p[1].c_str()); } else delete xl; } } fclose(f); return true; } virtual Version GetVersion() { return Version("Keeps a dynamic log of all XLines created, and stores them in a separate conf file (xline.db).", VF_VENDOR); } }; MODULE_INIT(ModuleXLineDB)