src/modules/m_rline.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
   6  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   7  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
   8  *
   9  * This file is part of InspIRCd.  InspIRCd is free software: you can
  10  * redistribute it and/or modify it under the terms of the GNU General Public
  11  * License as published by the Free Software Foundation, version 2.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22
  23 /* $ModDesc: RLINE: Regexp user banning. */
  24
  25 #include "inspircd.h"
  26 #include "modules/regex.h"
  27 #include "xline.h"
  28
  29 static bool ZlineOnMatch = false;
  30 static bool added_zline = false;
  31
  32 class RLine : public XLine
  33 {
  34  public:
  35
  36         /** Create a R-Line.
  37          * @param s_time The set time
  38          * @param d The duration of the xline
  39          * @param src The sender of the xline
  40          * @param re The reason of the xline
  41          * @param regex Pattern to match with
  42          * @
  43          */
  44         RLine(time_t s_time, long d, const std::string& src, const std::string& re, const std::string& regexs, dynamic_reference<RegexFactory>& rxfactory)
  45                 : XLine(s_time, d, src, re, "R")
  46                 , matchtext(regexs)
  47         {
  48                 /* This can throw on failure, but if it does we DONT catch it here, we catch it and display it
  49                  * where the object is created, we might not ALWAYS want it to output stuff to snomask x all the time
  50                  */
  51                 regex = rxfactory->Create(regexs);
  52         }
  53
  54         /** Destructor
  55          */
  56         ~RLine()
  57         {
  58                 delete regex;
  59         }
  60
  61         bool Matches(User *u)
  62         {
  63                 LocalUser* lu = IS_LOCAL(u);
  64                 if (lu && lu->exempt)
  65                         return false;
  66
  67                 std::string compare = u->nick + "!" + u->ident + "@" + u->host + " " + u->fullname;
  68                 return regex->Matches(compare);
  69         }
  70
  71         bool Matches(const std::string &compare)
  72         {
  73                 return regex->Matches(compare);
  74         }
  75
  76         void Apply(User* u)
  77         {
  78                 if (ZlineOnMatch)
  79                 {
  80                         ZLine* zl = new ZLine(ServerInstance->Time(), duration ? expiry - ServerInstance->Time() : 0, ServerInstance->Config->ServerName.c_str(), reason.c_str(), u->GetIPString());
  81                         if (ServerInstance->XLines->AddLine(zl, NULL))
  82                         {
  83                                 std::string timestr = ServerInstance->TimeString(zl->expiry);
  84                                 ServerInstance->SNO->WriteToSnoMask('x', "Z-line added due to R-line match on *@%s%s%s: %s",
  85                                         zl->ipaddr.c_str(), zl->duration ? " to expire on " : "", zl->duration ? timestr.c_str() : "", zl->reason.c_str());
  86                                 added_zline = true;
  87                         }
  88                         else
  89                                 delete zl;
  90                 }
  91                 DefaultApply(u, "R", false);
  92         }
  93
  94         const std::string& Displayable()
  95         {
  96                 return matchtext;
  97         }
  98
  99         std::string matchtext;
 100
 101         Regex *regex;
 102 };
 103
 104
 105 /** An XLineFactory specialized to generate RLine* pointers
 106  */
 107 class RLineFactory : public XLineFactory
 108 {
 109  public:
 110         dynamic_reference<RegexFactory>& rxfactory;
 111         RLineFactory(dynamic_reference<RegexFactory>& rx) : XLineFactory("R"), rxfactory(rx)
 112         {
 113         }
 114
 115         /** Generate a RLine
 116          */
 117         XLine* Generate(time_t set_time, long duration, std::string source, std::string reason, std::string xline_specific_mask)
 118         {
 119                 if (!rxfactory)
 120                 {
 121                         ServerInstance->SNO->WriteToSnoMask('a', "Cannot create regexes until engine is set to a loaded provider!");
 122                         throw ModuleException("Regex engine not set or loaded!");
 123                 }
 124
 125                 return new RLine(set_time, duration, source, reason, xline_specific_mask, rxfactory);
 126         }
 127 };
 128
 129 /** Handle /RLINE
 130  * Syntax is same as other lines: RLINE regex_goes_here 1d :reason
 131  */
 132 class CommandRLine : public Command
 133 {
 134         std::string rxengine;
 135         RLineFactory& factory;
 136
 137  public:
 138         CommandRLine(Module* Creator, RLineFactory& rlf) : Command(Creator,"RLINE", 1, 3), factory(rlf)
 139         {
 140                 flags_needed = 'o'; this->syntax = "<regex> [<rline-duration>] :<reason>";
 141         }
 142
 143         CmdResult Handle (const std::vector<std::string>& parameters, User *user)
 144         {
 145
 146                 if (parameters.size() >= 3)
 147                 {
 148                         // Adding - XXX todo make this respect <insane> tag perhaps..
 149
 150                         unsigned long duration = InspIRCd::Duration(parameters[1]);
 151                         XLine *r = NULL;
 152
 153                         try
 154                         {
 155                                 r = factory.Generate(ServerInstance->Time(), duration, user->nick.c_str(), parameters[2].c_str(), parameters[0].c_str());
 156                         }
 157                         catch (ModuleException &e)
 158                         {
 159                                 ServerInstance->SNO->WriteToSnoMask('a',"Could not add RLINE: %s", e.GetReason());
 160                         }
 161
 162                         if (r)
 163                         {
 164                                 if (ServerInstance->XLines->AddLine(r, user))
 165                                 {
 166                                         if (!duration)
 167                                         {
 168                                                 ServerInstance->SNO->WriteToSnoMask('x',"%s added permanent R-line for %s: %s", user->nick.c_str(), parameters[0].c_str(), parameters[2].c_str());
 169                                         }
 170                                         else
 171                                         {
 172                                                 time_t c_requires_crap = duration + ServerInstance->Time();
 173                                                 std::string timestr = ServerInstance->TimeString(c_requires_crap);
 174                                                 ServerInstance->SNO->WriteToSnoMask('x', "%s added timed R-line for %s to expire on %s: %s", user->nick.c_str(), parameters[0].c_str(), timestr.c_str(), parameters[2].c_str());
 175                                         }
 176
 177                                         ServerInstance->XLines->ApplyLines();
 178                                 }
 179                                 else
 180                                 {
 181                                         delete r;
 182                                         user->WriteNotice("*** R-Line for " + parameters[0] + " already exists");
 183                                 }
 184                         }
 185                 }
 186                 else
 187                 {
 188                         if (ServerInstance->XLines->DelLine(parameters[0].c_str(), "R", user))
 189                         {
 190                                 ServerInstance->SNO->WriteToSnoMask('x',"%s removed R-line on %s",user->nick.c_str(),parameters[0].c_str());
 191                         }
 192                         else
 193                         {
 194                                 user->WriteNotice("*** R-Line " + parameters[0] + " not found in list, try /stats R.");
 195                         }
 196                 }
 197
 198                 return CMD_SUCCESS;
 199         }
 200
 201         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 202         {
 203                 if (IS_LOCAL(user))
 204                         return ROUTE_LOCALONLY; // spanningtree will send ADDLINE
 205
 206                 return ROUTE_BROADCAST;
 207         }
 208 };
 209
 210 class ModuleRLine : public Module
 211 {
 212         dynamic_reference<RegexFactory> rxfactory;
 213         RLineFactory f;
 214         CommandRLine r;
 215         bool MatchOnNickChange;
 216         bool initing;
 217         RegexFactory* factory;
 218
 219  public:
 220         ModuleRLine()
 221                 : rxfactory(this, "regex"), f(rxfactory), r(this, f)
 222                 , initing(true)
 223         {
 224         }
 225
 226         void init() CXX11_OVERRIDE
 227         {
 228                 OnRehash(NULL);
 229
 230                 ServerInstance->Modules->AddService(r);
 231                 ServerInstance->XLines->RegisterFactory(&f);
 232
 233                 Implementation eventlist[] = { I_OnUserRegister, I_OnRehash, I_OnUserPostNick, I_OnStats, I_OnBackgroundTimer, I_OnUnloadModule };
 234                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 235         }
 236
 237         ~ModuleRLine()
 238         {
 239                 ServerInstance->XLines->DelAll("R");
 240                 ServerInstance->XLines->UnregisterFactory(&f);
 241         }
 242
 243         Version GetVersion() CXX11_OVERRIDE
 244         {
 245                 return Version("RLINE: Regexp user banning.", VF_COMMON | VF_VENDOR, rxfactory ? rxfactory->name : "");
 246         }
 247
 248         ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE
 249         {
 250                 // Apply lines on user connect
 251                 XLine *rl = ServerInstance->XLines->MatchesLine("R", user);
 252
 253                 if (rl)
 254                 {
 255                         // Bang. :P
 256                         rl->Apply(user);
 257                         return MOD_RES_DENY;
 258                 }
 259                 return MOD_RES_PASSTHRU;
 260         }
 261
 262         void OnRehash(User *user) CXX11_OVERRIDE
 263         {
 264                 ConfigTag* tag = ServerInstance->Config->ConfValue("rline");
 265
 266                 MatchOnNickChange = tag->getBool("matchonnickchange");
 267                 ZlineOnMatch = tag->getBool("zlineonmatch");
 268                 std::string newrxengine = tag->getString("engine");
 269
 270                 factory = rxfactory ? (rxfactory.operator->()) : NULL;
 271
 272                 if (newrxengine.empty())
 273                         rxfactory.SetProvider("regex");
 274                 else
 275                         rxfactory.SetProvider("regex/" + newrxengine);
 276
 277                 if (!rxfactory)
 278                 {
 279                         if (newrxengine.empty())
 280                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: No regex engine loaded - R-Line functionality disabled until this is corrected.");
 281                         else
 282                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: Regex engine '%s' is not loaded - R-Line functionality disabled until this is corrected.", newrxengine.c_str());
 283
 284                         ServerInstance->XLines->DelAll(f.GetType());
 285                 }
 286                 else if ((!initing) && (rxfactory.operator->() != factory))
 287                 {
 288                         ServerInstance->SNO->WriteToSnoMask('a', "Regex engine has changed, removing all R-Lines");
 289                         ServerInstance->XLines->DelAll(f.GetType());
 290                 }
 291
 292                 initing = false;
 293         }
 294
 295         ModResult OnStats(char symbol, User* user, string_list &results) CXX11_OVERRIDE
 296         {
 297                 if (symbol != 'R')
 298                         return MOD_RES_PASSTHRU;
 299
 300                 ServerInstance->XLines->InvokeStats("R", 223, user, results);
 301                 return MOD_RES_DENY;
 302         }
 303
 304         void OnUserPostNick(User *user, const std::string &oldnick) CXX11_OVERRIDE
 305         {
 306                 if (!IS_LOCAL(user))
 307                         return;
 308
 309                 if (!MatchOnNickChange)
 310                         return;
 311
 312                 XLine *rl = ServerInstance->XLines->MatchesLine("R", user);
 313
 314                 if (rl)
 315                 {
 316                         // Bang! :D
 317                         rl->Apply(user);
 318                 }
 319         }
 320
 321         void OnBackgroundTimer(time_t curtime) CXX11_OVERRIDE
 322         {
 323                 if (added_zline)
 324                 {
 325                         added_zline = false;
 326                         ServerInstance->XLines->ApplyLines();
 327                 }
 328         }
 329
 330         void OnUnloadModule(Module* mod) CXX11_OVERRIDE
 331         {
 332                 // If the regex engine became unavailable or has changed, remove all rlines
 333                 if (!rxfactory)
 334                 {
 335                         ServerInstance->XLines->DelAll(f.GetType());
 336                 }
 337                 else if (rxfactory.operator->() != factory)
 338                 {
 339                         factory = rxfactory.operator->();
 340                         ServerInstance->XLines->DelAll(f.GetType());
 341                 }
 342         }
 343
 344         void Prioritize()
 345         {
 346                 Module* mod = ServerInstance->Modules->Find("m_cgiirc.so");
 347                 ServerInstance->Modules->SetPriority(this, I_OnUserRegister, PRIORITY_AFTER, mod);
 348         }
 349 };
 350
 351 MODULE_INIT(ModuleRLine)