src/modules/m_xline_db.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   5  *   Copyright (C) 2008 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 "xline.h"
  23 #include <fstream>
  24
  25 class ModuleXLineDB : public Module
  26 {
  27         bool dirty;
  28         std::string xlinedbpath;
  29  public:
  30         void init() CXX11_OVERRIDE
  31         {
  32                 /* Load the configuration
  33                  * Note:
  34                  *              This is on purpose not changed on a rehash. It would be non-trivial to change the database on-the-fly.
  35                  *              Imagine a scenario where the new file already exists. Merging the current XLines with the existing database is likely a bad idea
  36                  *              ...and so is discarding all current in-memory XLines for the ones in the database.
  37                  */
  38                 ConfigTag* Conf = ServerInstance->Config->ConfValue("xlinedb");
  39                 xlinedbpath = ServerInstance->Config->Paths.PrependData(Conf->getString("filename", "xline.db"));
  40
  41                 // Read xlines before attaching to events
  42                 ReadDatabase();
  43
  44                 dirty = false;
  45         }
  46
  47         /** Called whenever an xline is added by a local user.
  48          * This method is triggered after the line is added.
  49          * @param source The sender of the line or NULL for local server
  50          * @param line The xline being added
  51          */
  52         void OnAddLine(User* source, XLine* line) CXX11_OVERRIDE
  53         {
  54                 dirty = true;
  55         }
  56
  57         /** Called whenever an xline is deleted.
  58          * This method is triggered after the line is deleted.
  59          * @param source The user removing the line or NULL for local server
  60          * @param line the line being deleted
  61          */
  62         void OnDelLine(User* source, XLine* line) CXX11_OVERRIDE
  63         {
  64                 dirty = true;
  65         }
  66
  67         void OnExpireLine(XLine *line) CXX11_OVERRIDE
  68         {
  69                 dirty = true;
  70         }
  71
  72         void OnBackgroundTimer(time_t now) CXX11_OVERRIDE
  73         {
  74                 if (dirty)
  75                 {
  76                         if (WriteDatabase())
  77                                 dirty = false;
  78                 }
  79         }
  80
  81         bool WriteDatabase()
  82         {
  83                 /*
  84                  * We need to perform an atomic write so as not to fuck things up.
  85                  * So, let's write to a temporary file, flush it, then rename the file..
  86                  * Technically, that means that this can block, but I have *never* seen that.
  87                  *     -- w00t
  88                  */
  89                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Opening temporary database");
  90                 std::string xlinenewdbpath = xlinedbpath + ".new";
  91                 std::ofstream stream(xlinenewdbpath.c_str());
  92                 if (!stream.is_open())
  93                 {
  94                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Cannot create database! %s (%d)", strerror(errno), errno);
  95                         ServerInstance->SNO->WriteToSnoMask('a', "database: cannot create new db: %s (%d)", strerror(errno), errno);
  96                         return false;
  97                 }
  98
  99                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Opened. Writing..");
 100
 101                 /*
 102                  * Now, much as I hate writing semi-unportable formats, additional
 103                  * xline types may not have a conf tag, so let's just write them.
 104                  * In addition, let's use a file version, so we can maintain some
 105                  * semblance of backwards compatibility for reading on startup..
 106                  *              -- w00t
 107                  */
 108                 stream << "VERSION 1" << std::endl;
 109
 110                 // Now, let's write.
 111                 std::vector<std::string> types = ServerInstance->XLines->GetAllTypes();
 112                 for (std::vector<std::string>::const_iterator it = types.begin(); it != types.end(); ++it)
 113                 {
 114                         XLineLookup* lookup = ServerInstance->XLines->GetAll(*it);
 115                         if (!lookup)
 116                                 continue; // Not possible as we just obtained the list from XLineManager
 117
 118                         for (LookupIter i = lookup->begin(); i != lookup->end(); ++i)
 119                         {
 120                                 XLine* line = i->second;
 121                                 stream << "LINE " << line->type << " " << line->Displayable() << " "
 122                                         << ServerInstance->Config->ServerName << " " << line->set_time << " "
 123                                         << line->duration << " " << line->reason << std::endl;
 124                         }
 125                 }
 126
 127                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Finished writing XLines. Checking for error..");
 128
 129                 if (stream.fail())
 130                 {
 131                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Cannot write to new database! %s (%d)", strerror(errno), errno);
 132                         ServerInstance->SNO->WriteToSnoMask('a', "database: cannot write to new db: %s (%d)", strerror(errno), errno);
 133                         return false;
 134                 }
 135                 stream.close();
 136
 137 #ifdef _WIN32
 138                 if (remove(xlinedbpath.c_str()))
 139                 {
 140                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Cannot remove old database! %s (%d)", strerror(errno), errno);
 141                         ServerInstance->SNO->WriteToSnoMask('a', "database: cannot remove old database: %s (%d)", strerror(errno), errno);
 142                         return false;
 143                 }
 144 #endif
 145                 // Use rename to move temporary to new db - this is guarenteed not to fuck up, even in case of a crash.
 146                 if (rename(xlinenewdbpath.c_str(), xlinedbpath.c_str()) < 0)
 147                 {
 148                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Cannot move new to old database! %s (%d)", strerror(errno), errno);
 149                         ServerInstance->SNO->WriteToSnoMask('a', "database: cannot replace old with new db: %s (%d)", strerror(errno), errno);
 150                         return false;
 151                 }
 152
 153                 return true;
 154         }
 155
 156         bool ReadDatabase()
 157         {
 158                 // If the xline database doesn't exist then we don't need to load it.
 159                 if (!FileSystem::FileExists(xlinedbpath))
 160                         return true;
 161
 162                 std::ifstream stream(xlinedbpath.c_str());
 163                 if (!stream.is_open())
 164                 {
 165                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Cannot read database! %s (%d)", strerror(errno), errno);
 166                         ServerInstance->SNO->WriteToSnoMask('a', "database: cannot read db: %s (%d)", strerror(errno), errno);
 167                         return false;
 168                 }
 169
 170                 std::string line;
 171                 while (std::getline(stream, line))
 172                 {
 173                         // Inspired by the command parser. :)
 174                         irc::tokenstream tokens(line);
 175                         int items = 0;
 176                         std::string command_p[7];
 177                         std::string tmp;
 178
 179                         while (tokens.GetToken(tmp) && (items < 7))
 180                         {
 181                                 command_p[items] = tmp;
 182                                 items++;
 183                         }
 184
 185                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Processing %s", line.c_str());
 186
 187                         if (command_p[0] == "VERSION")
 188                         {
 189                                 if (command_p[1] != "1")
 190                                 {
 191                                         stream.close();
 192                                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "I got database version %s - I don't understand it", command_p[1].c_str());
 193                                         ServerInstance->SNO->WriteToSnoMask('a', "database: I got a database version (%s) I don't understand", command_p[1].c_str());
 194                                         return false;
 195                                 }
 196                         }
 197                         else if (command_p[0] == "LINE")
 198                         {
 199                                 // Mercilessly stolen from spanningtree
 200                                 XLineFactory* xlf = ServerInstance->XLines->GetFactory(command_p[1]);
 201
 202                                 if (!xlf)
 203                                 {
 204                                         ServerInstance->SNO->WriteToSnoMask('a', "database: Unknown line type (%s).", command_p[1].c_str());
 205                                         continue;
 206                                 }
 207
 208                                 XLine* xl = xlf->Generate(ServerInstance->Time(), atoi(command_p[5].c_str()), command_p[3], command_p[6], command_p[2]);
 209                                 xl->SetCreateTime(atoi(command_p[4].c_str()));
 210
 211                                 if (ServerInstance->XLines->AddLine(xl, NULL))
 212                                 {
 213                                         ServerInstance->SNO->WriteToSnoMask('x', "database: Added a line of type %s", command_p[1].c_str());
 214                                 }
 215                                 else
 216                                         delete xl;
 217                         }
 218                 }
 219                 stream.close();
 220                 return true;
 221         }
 222
 223         Version GetVersion() CXX11_OVERRIDE
 224         {
 225                 return Version("Keeps a dynamic log of all XLines created, and stores them in a separate conf file (xline.db).", VF_VENDOR);
 226         }
 227 };
 228
 229 MODULE_INIT(ModuleXLineDB)