src/modules/m_alias.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2005, 2009 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2004-2007, 2009 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   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 #include "inspircd.h"
  24
  25 /** An alias definition
  26  */
  27 class Alias
  28 {
  29  public:
  30         /** The text of the alias command */
  31         std::string AliasedCommand;
  32
  33         /** Text to replace with */
  34         std::string ReplaceFormat;
  35
  36         /** Nickname required to perform alias */
  37         std::string RequiredNick;
  38
  39         /** Alias requires ulined server */
  40         bool ULineOnly;
  41
  42         /** Requires oper? */
  43         bool OperOnly;
  44
  45         /* whether or not it may be executed via fantasy (default OFF) */
  46         bool ChannelCommand;
  47
  48         /* whether or not it may be executed via /command (default ON) */
  49         bool UserCommand;
  50
  51         /** Format that must be matched for use */
  52         std::string format;
  53 };
  54
  55 class ModuleAlias : public Module
  56 {
  57         std::string fprefix;
  58
  59         /* We cant use a map, there may be multiple aliases with the same name.
  60          * We can, however, use a fancy invention: the multimap. Maps a key to one or more values.
  61          *              -- w00t
  62          */
  63         typedef insp::flat_multimap<std::string, Alias, irc::insensitive_swo> AliasMap;
  64
  65         AliasMap Aliases;
  66
  67         /* whether or not +B users are allowed to use fantasy commands */
  68         bool AllowBots;
  69         UserModeReference botmode;
  70
  71         // Whether we are actively executing an alias.
  72         bool active;
  73
  74  public:
  75         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
  76         {
  77                 AliasMap newAliases;
  78                 ConfigTagList tags = ServerInstance->Config->ConfTags("alias");
  79                 for(ConfigIter i = tags.first; i != tags.second; ++i)
  80                 {
  81                         ConfigTag* tag = i->second;
  82                         Alias a;
  83                         a.AliasedCommand = tag->getString("text");
  84                         if (a.AliasedCommand.empty())
  85                                 throw ModuleException("<alias:text> is empty! at " + tag->getTagLocation());
  86
  87                         tag->readString("replace", a.ReplaceFormat, true);
  88                         if (a.ReplaceFormat.empty())
  89                                 throw ModuleException("<alias:replace> is empty! at " + tag->getTagLocation());
  90
  91                         a.RequiredNick = tag->getString("requires");
  92                         a.ULineOnly = tag->getBool("uline");
  93                         a.ChannelCommand = tag->getBool("channelcommand", false);
  94                         a.UserCommand = tag->getBool("usercommand", true);
  95                         a.OperOnly = tag->getBool("operonly");
  96                         a.format = tag->getString("format");
  97
  98                         std::transform(a.AliasedCommand.begin(), a.AliasedCommand.end(), a.AliasedCommand.begin(), ::toupper);
  99                         newAliases.insert(std::make_pair(a.AliasedCommand, a));
 100                 }
 101
 102                 ConfigTag* fantasy = ServerInstance->Config->ConfValue("fantasy");
 103                 AllowBots = fantasy->getBool("allowbots", false);
 104                 fprefix = fantasy->getString("prefix", "!", 1, ServerInstance->Config->Limits.MaxLine);
 105                 Aliases.swap(newAliases);
 106         }
 107
 108         ModuleAlias()
 109                 : botmode(this, "bot")
 110                 , active(false)
 111         {
 112         }
 113
 114         Version GetVersion() CXX11_OVERRIDE
 115         {
 116                 return Version("Provides aliases of commands", VF_VENDOR);
 117         }
 118
 119         std::string GetVar(std::string varname, const std::string &original_line)
 120         {
 121                 irc::spacesepstream ss(original_line);
 122                 varname.erase(varname.begin());
 123                 int index = *(varname.begin()) - 48;
 124                 varname.erase(varname.begin());
 125                 bool everything_after = (varname == "-");
 126                 std::string word;
 127
 128                 for (int j = 0; j < index; j++)
 129                         ss.GetToken(word);
 130
 131                 if (everything_after)
 132                 {
 133                         std::string more;
 134                         while (ss.GetToken(more))
 135                         {
 136                                 word.append(" ");
 137                                 word.append(more);
 138                         }
 139                 }
 140
 141                 return word;
 142         }
 143
 144         std::string CreateRFCMessage(const std::string& command, CommandBase::Params& parameters)
 145         {
 146                 std::string message(command);
 147                 for (CommandBase::Params::const_iterator iter = parameters.begin(); iter != parameters.end();)
 148                 {
 149                         const std::string& parameter = *iter++;
 150                         message.push_back(' ');
 151                         if (iter == parameters.end() && (parameter.empty() || parameter.find(' ') != std::string::npos))
 152                                 message.push_back(':');
 153                         message.append(parameter);
 154                 }
 155                 return message;
 156         }
 157
 158         ModResult OnPreCommand(std::string& command, CommandBase::Params& parameters, LocalUser* user, bool validated) CXX11_OVERRIDE
 159         {
 160                 /* If theyre not registered yet, we dont want
 161                  * to know.
 162                  */
 163                 if (user->registered != REG_ALL)
 164                         return MOD_RES_PASSTHRU;
 165
 166                 /* We dont have any commands looking like this? Stop processing. */
 167                 std::pair<AliasMap::iterator, AliasMap::iterator> iters = Aliases.equal_range(command);
 168                 if (iters.first == iters.second)
 169                         return MOD_RES_PASSTHRU;
 170
 171                 /* The parameters for the command in their original form, with the command stripped off */
 172                 std::string original_line = CreateRFCMessage(command, parameters);
 173                 std::string compare(original_line, command.length());
 174                 while (*(compare.c_str()) == ' ')
 175                         compare.erase(compare.begin());
 176
 177                 for (AliasMap::iterator i = iters.first; i != iters.second; ++i)
 178                 {
 179                         if (i->second.UserCommand)
 180                         {
 181                                 if (DoAlias(user, NULL, &(i->second), compare, original_line))
 182                                 {
 183                                         return MOD_RES_DENY;
 184                                 }
 185                         }
 186                 }
 187
 188                 // If we made it here, no aliases actually matched.
 189                 return MOD_RES_PASSTHRU;
 190         }
 191
 192         ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
 193         {
 194                 // Don't echo anything which is caused by an alias.
 195                 if (active)
 196                         details.echo = false;
 197
 198                 return MOD_RES_PASSTHRU;
 199         }
 200
 201         void OnUserPostMessage(User* user, const MessageTarget& target, const MessageDetails& details) CXX11_OVERRIDE
 202         {
 203                 if ((target.type != MessageTarget::TYPE_CHANNEL) || (details.type != MSG_PRIVMSG))
 204                 {
 205                         return;
 206                 }
 207
 208                 // fcommands are only for local users. Spanningtree will send them back out as their original cmd.
 209                 if (!IS_LOCAL(user))
 210                 {
 211                         return;
 212                 }
 213
 214                 /* Stop here if the user is +B and allowbot is set to no. */
 215                 if (!AllowBots && user->IsModeSet(botmode))
 216                 {
 217                         return;
 218                 }
 219
 220                 Channel *c = target.Get<Channel>();
 221                 std::string scommand;
 222
 223                 // text is like "!moo cows bite me", we want "!moo" first
 224                 irc::spacesepstream ss(details.text);
 225                 ss.GetToken(scommand);
 226
 227                 if (scommand.size() <= fprefix.size())
 228                 {
 229                         return; // wtfbbq
 230                 }
 231
 232                 // we don't want to touch non-fantasy stuff
 233                 if (scommand.compare(0, fprefix.size(), fprefix) != 0)
 234                 {
 235                         return;
 236                 }
 237
 238                 // nor do we give a shit about the prefix
 239                 scommand.erase(0, fprefix.size());
 240
 241                 std::pair<AliasMap::iterator, AliasMap::iterator> iters = Aliases.equal_range(scommand);
 242                 if (iters.first == iters.second)
 243                         return;
 244
 245                 /* The parameters for the command in their original form, with the command stripped off */
 246                 std::string compare(details.text, scommand.length() + fprefix.size());
 247                 while (*(compare.c_str()) == ' ')
 248                         compare.erase(compare.begin());
 249
 250                 for (AliasMap::iterator i = iters.first; i != iters.second; ++i)
 251                 {
 252                         if (i->second.ChannelCommand)
 253                         {
 254                                 // We use substr here to remove the fantasy prefix
 255                                 if (DoAlias(user, c, &(i->second), compare, details.text.substr(fprefix.size())))
 256                                         return;
 257                         }
 258                 }
 259         }
 260
 261
 262         int DoAlias(User *user, Channel *c, Alias *a, const std::string& compare, const std::string& safe)
 263         {
 264                 /* Does it match the pattern? */
 265                 if (!a->format.empty())
 266                 {
 267                         if (!InspIRCd::Match(compare, a->format))
 268                                 return 0;
 269                 }
 270
 271                 if ((a->OperOnly) && (!user->IsOper()))
 272                         return 0;
 273
 274                 if (!a->RequiredNick.empty())
 275                 {
 276                         User* u = ServerInstance->FindNick(a->RequiredNick);
 277                         if (!u)
 278                         {
 279                                 user->WriteNumeric(ERR_NOSUCHNICK, a->RequiredNick, "is currently unavailable. Please try again later.");
 280                                 return 1;
 281                         }
 282
 283                         if ((a->ULineOnly) && (!u->server->IsULine()))
 284                         {
 285                                 ServerInstance->SNO->WriteToSnoMask('a', "NOTICE -- Service "+a->RequiredNick+" required by alias "+a->AliasedCommand+" is not on a U-lined server, possibly underhanded antics detected!");
 286                                 user->WriteNumeric(ERR_NOSUCHNICK, a->RequiredNick, "is not a network service! Please inform a server operator as soon as possible.");
 287                                 return 1;
 288                         }
 289                 }
 290
 291                 /* Now, search and replace in a copy of the original_line, replacing $1 through $9 and $1- etc */
 292
 293                 std::string::size_type crlf = a->ReplaceFormat.find('\n');
 294
 295                 if (crlf == std::string::npos)
 296                 {
 297                         DoCommand(a->ReplaceFormat, user, c, safe, a);
 298                         return 1;
 299                 }
 300                 else
 301                 {
 302                         irc::sepstream commands(a->ReplaceFormat, '\n');
 303                         std::string scommand;
 304                         while (commands.GetToken(scommand))
 305                         {
 306                                 DoCommand(scommand, user, c, safe, a);
 307                         }
 308                         return 1;
 309                 }
 310         }
 311
 312         void DoCommand(const std::string& newline, User* user, Channel *chan, const std::string &original_line, Alias* a)
 313         {
 314                 std::string result;
 315                 result.reserve(newline.length());
 316                 for (unsigned int i = 0; i < newline.length(); i++)
 317                 {
 318                         char c = newline[i];
 319                         if ((c == '$') && (i + 1 < newline.length()))
 320                         {
 321                                 if (isdigit(newline[i+1]))
 322                                 {
 323                                         size_t len = ((i + 2 < newline.length()) && (newline[i+2] == '-')) ? 3 : 2;
 324                                         std::string var = newline.substr(i, len);
 325                                         result.append(GetVar(var, original_line));
 326                                         i += len - 1;
 327                                 }
 328                                 else if (!newline.compare(i, 5, "$nick", 5))
 329                                 {
 330                                         result.append(user->nick);
 331                                         i += 4;
 332                                 }
 333                                 else if (!newline.compare(i, 5, "$host", 5))
 334                                 {
 335                                         result.append(user->GetRealHost());
 336                                         i += 4;
 337                                 }
 338                                 else if (!newline.compare(i, 5, "$chan", 5))
 339                                 {
 340                                         if (chan)
 341                                                 result.append(chan->name);
 342                                         i += 4;
 343                                 }
 344                                 else if (!newline.compare(i, 6, "$ident", 6))
 345                                 {
 346                                         result.append(user->ident);
 347                                         i += 5;
 348                                 }
 349                                 else if (!newline.compare(i, 6, "$vhost", 6))
 350                                 {
 351                                         result.append(user->GetDisplayedHost());
 352                                         i += 5;
 353                                 }
 354                                 else if (!newline.compare(i, 12, "$requirement", 12))
 355                                 {
 356                                         result.append(a->RequiredNick);
 357                                         i += 11;
 358                                 }
 359                                 else
 360                                         result.push_back(c);
 361                         }
 362                         else
 363                                 result.push_back(c);
 364                 }
 365
 366                 irc::tokenstream ss(result);
 367                 CommandBase::Params pars;
 368                 std::string command, token;
 369
 370                 ss.GetMiddle(command);
 371                 while (ss.GetTrailing(token))
 372                 {
 373                         pars.push_back(token);
 374                 }
 375
 376                 active = true;
 377                 ServerInstance->Parser.CallHandler(command, pars, user);
 378                 active = false;
 379         }
 380
 381         void Prioritize() CXX11_OVERRIDE
 382         {
 383                 // Prioritise after spanningtree so that channel aliases show the alias before the effects.
 384                 Module* linkmod = ServerInstance->Modules->Find("m_spanningtree.so");
 385                 ServerInstance->Modules->SetPriority(this, I_OnUserPostMessage, PRIORITY_AFTER, linkmod);
 386         }
 387 };
 388
 389 MODULE_INIT(ModuleAlias)