src/modules/m_alias.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Provides aliases of commands. */
  17
  18 /** An alias definition
  19  */
  20 class Alias : public classbase
  21 {
  22  public:
  23         /** The text of the alias command */
  24         irc::string AliasedCommand;
  25
  26         /** Text to replace with */
  27         std::string ReplaceFormat;
  28
  29         /** Nickname required to perform alias */
  30         std::string RequiredNick;
  31
  32         /** Alias requires ulined server */
  33         bool ULineOnly;
  34
  35         /** Requires oper? */
  36         bool OperOnly;
  37
  38         /* is case sensitive params */
  39         bool CaseSensitive;
  40
  41         /* whether or not it may be executed via fantasy (default OFF) */
  42         bool ChannelCommand;
  43
  44         /* whether or not it may be executed via /command (default ON) */
  45         bool UserCommand;
  46
  47         /** Format that must be matched for use */
  48         std::string format;
  49 };
  50
  51 class ModuleAlias : public Module
  52 {
  53  private:
  54         /* We cant use a map, there may be multiple aliases with the same name.
  55          * We can, however, use a fancy invention: the multimap. Maps a key to one or more values.
  56          *              -- w00t
  57    */
  58         std::multimap<std::string, Alias> Aliases;
  59
  60         virtual void ReadAliases()
  61         {
  62                 ConfigReader MyConf(ServerInstance);
  63
  64                 Aliases.clear();
  65                 for (int i = 0; i < MyConf.Enumerate("alias"); i++)
  66                 {
  67                         Alias a;
  68                         std::string txt;
  69                         txt = MyConf.ReadValue("alias", "text", i);
  70                         a.AliasedCommand = txt.c_str();
  71                         a.ReplaceFormat = MyConf.ReadValue("alias", "replace", i, true);
  72                         a.RequiredNick = MyConf.ReadValue("alias", "requires", i);
  73                         a.ULineOnly = MyConf.ReadFlag("alias", "uline", i);
  74                         a.ChannelCommand = MyConf.ReadFlag("alias", "channelcommand", "no", i);
  75                         a.UserCommand = MyConf.ReadFlag("alias", "usercommand", "yes", i);
  76                         a.OperOnly = MyConf.ReadFlag("alias", "operonly", i);
  77                         a.format = MyConf.ReadValue("alias", "format", i);
  78                         a.CaseSensitive = MyConf.ReadFlag("alias", "matchcase", i);
  79                         Aliases.insert(std::make_pair(txt, a));
  80                 }
  81         }
  82
  83  public:
  84
  85         ModuleAlias(InspIRCd* Me)
  86                 : Module(Me)
  87         {
  88                 ReadAliases();
  89                 Me->Modules->Attach(I_OnPreCommand, this);
  90                 Me->Modules->Attach(I_OnRehash, this);
  91                 Me->Modules->Attach(I_OnUserPreMessage, this);
  92
  93         }
  94
  95         virtual ~ModuleAlias()
  96         {
  97         }
  98
  99         virtual Version GetVersion()
 100         {
 101                 return Version("$Id$", VF_VENDOR,API_VERSION);
 102         }
 103
 104         std::string GetVar(std::string varname, const std::string &original_line)
 105         {
 106                 irc::spacesepstream ss(original_line);
 107                 varname.erase(varname.begin());
 108                 int index = *(varname.begin()) - 48;
 109                 varname.erase(varname.begin());
 110                 bool everything_after = (varname == "-");
 111                 std::string word;
 112
 113                 for (int j = 0; j < index; j++)
 114                         ss.GetToken(word);
 115
 116                 if (everything_after)
 117                 {
 118                         std::string more;
 119                         while (ss.GetToken(more))
 120                         {
 121                                 word.append(" ");
 122                                 word.append(more);
 123                         }
 124                 }
 125
 126                 return word;
 127         }
 128
 129         void SearchAndReplace(std::string& newline, const std::string &find, const std::string &replace)
 130         {
 131                 std::string::size_type x = newline.find(find);
 132                 while (x != std::string::npos)
 133                 {
 134                         newline.erase(x, find.length());
 135                         newline.insert(x, replace);
 136                         x = newline.find(find);
 137                 }
 138         }
 139
 140         virtual int OnPreCommand(std::string &command, std::vector<std::string> &parameters, User *user, bool validated, const std::string &original_line)
 141         {
 142                 std::multimap<std::string, Alias>::iterator i;
 143
 144                 /* If theyre not registered yet, we dont want
 145                  * to know.
 146                  */
 147                 if (user->registered != REG_ALL)
 148                         return 0;
 149
 150                 /* We dont have any commands looking like this? Stop processing. */
 151                 i = Aliases.find(command);
 152                 if (i == Aliases.end())
 153                         return 0;
 154
 155                 irc::string c = command.c_str();
 156                 /* The parameters for the command in their original form, with the command stripped off */
 157                 std::string compare = original_line.substr(command.length());
 158                 while (*(compare.c_str()) == ' ')
 159                         compare.erase(compare.begin());
 160
 161                 std::string safe(original_line);
 162
 163                 /* Escape out any $ symbols in the user provided text */
 164
 165                 SearchAndReplace(safe, "$", "\r");
 166
 167                 while (i != Aliases.end())
 168                 {
 169                         if (i->second.UserCommand)
 170                         {
 171                                 if (DoAlias(user, NULL, &(i->second), compare, safe))
 172                                 {
 173                                         return 1;
 174                                 }
 175                         }
 176
 177                         i++;
 178                 }
 179
 180                 // If aliases have been processed, aliases took it.
 181                 return 1;
 182         }
 183
 184         virtual int OnUserPreMessage(User *user, void *dest, int target_type, std::string &text, char status, CUList &exempt_list)
 185         {
 186                 if (target_type != TYPE_CHANNEL)
 187                 {
 188                         ServerInstance->Logs->Log("FANTASY", DEBUG, "fantasy: not a channel msg");
 189                         return 0;
 190                 }
 191
 192                 // fcommands are only for local users. Spanningtree will send them back out as their original cmd.
 193                 if (!IS_LOCAL(user))
 194                 {
 195                         ServerInstance->Logs->Log("FANTASY", DEBUG, "fantasy: not local");
 196                         return 0;
 197                 }
 198
 199                 Channel *c = (Channel *)dest;
 200                 std::string fcommand;
 201
 202                 // text is like "!moo cows bite me", we want "!moo" first
 203                 irc::spacesepstream ss(text);
 204                 ss.GetToken(fcommand);
 205
 206                 if (fcommand.empty())
 207                 {
 208                         ServerInstance->Logs->Log("FANTASY", DEBUG, "fantasy: empty (?)");
 209                         return 0; // wtfbbq
 210                 }
 211
 212                 ServerInstance->Logs->Log("FANTASY", DEBUG, "fantasy: looking at fcommand %s", fcommand.c_str());
 213
 214                 // we don't want to touch non-fantasy stuff
 215                 if (*fcommand.c_str() != '!')
 216                 {
 217                         ServerInstance->Logs->Log("FANTASY", DEBUG, "fantasy: not a fcommand");
 218                         return 0;
 219                 }
 220
 221                 // nor do we give a shit about the !
 222                 fcommand.erase(fcommand.begin());
 223                 std::transform(fcommand.begin(), fcommand.end(), fcommand.begin(), ::toupper);
 224                 ServerInstance->Logs->Log("FANTASY", DEBUG, "fantasy: now got %s", fcommand.c_str());
 225
 226
 227                 std::multimap<std::string, Alias>::iterator i = Aliases.find(fcommand);
 228
 229                 if (i == Aliases.end())
 230                         return 0;
 231
 232
 233                 /* The parameters for the command in their original form, with the command stripped off */
 234                 std::string compare = text.substr(fcommand.length() + 1);
 235                 while (*(compare.c_str()) == ' ')
 236                         compare.erase(compare.begin());
 237
 238                 std::string safe(compare);
 239
 240                 /* Escape out any $ symbols in the user provided text (ugly, but better than crashy) */
 241                 SearchAndReplace(safe, "$", "\r");
 242
 243                 ServerInstance->Logs->Log("FANTASY", DEBUG, "fantasy: compare is %s and safe is %s", compare.c_str(), safe.c_str());
 244
 245                 while (i != Aliases.end())
 246                 {
 247                         if (i->second.ChannelCommand)
 248                         {
 249                                 if (DoAlias(user, c, &(i->second), compare, safe))
 250                                         return 0;
 251                         }
 252
 253                         i++;
 254                 }
 255
 256                 return 0;
 257         }
 258
 259
 260         int DoAlias(User *user, Channel *c, Alias *a, const std::string compare, const std::string safe)
 261         {
 262                 User *u = NULL;
 263
 264                 /* Does it match the pattern? */
 265                 if (!a->format.empty())
 266                 {
 267                         if (a->CaseSensitive)
 268                         {
 269                                 if (InspIRCd::Match(compare, a->format, case_sensitive_map))
 270                                         return 0;
 271                         }
 272                         else
 273                         {
 274                                 if (InspIRCd::Match(compare, a->format))
 275                                         return 0;
 276                         }
 277                 }
 278
 279                 if ((a->OperOnly) && (!IS_OPER(user)))
 280                         return 0;
 281
 282                 if (!a->RequiredNick.empty())
 283                 {
 284                         u = ServerInstance->FindNick(a->RequiredNick);
 285                         if (!u)
 286                         {
 287                                 user->WriteNumeric(401, ""+std::string(user->nick)+" "+a->RequiredNick+" :is currently unavailable. Please try again later.");
 288                                 return 1;
 289                         }
 290                 }
 291                 if ((u != NULL) && (!a->RequiredNick.empty()) && (a->ULineOnly))
 292                 {
 293                         if (!ServerInstance->ULine(u->server))
 294                         {
 295                                 ServerInstance->SNO->WriteToSnoMask('A', "NOTICE -- Service "+a->RequiredNick+" required by alias "+std::string(a->AliasedCommand.c_str())+" is not on a u-lined server, possibly underhanded antics detected!");
 296                                 user->WriteNumeric(401, ""+std::string(user->nick)+" "+a->RequiredNick+" :is an imposter! Please inform an IRC operator as soon as possible.");
 297                                 return 1;
 298                         }
 299                 }
 300
 301                 /* Now, search and replace in a copy of the original_line, replacing $1 through $9 and $1- etc */
 302
 303                 std::string::size_type crlf = a->ReplaceFormat.find('\n');
 304
 305                 if (crlf == std::string::npos)
 306                 {
 307                         DoCommand(a->ReplaceFormat, user, c, safe);
 308                         return 1;
 309                 }
 310                 else
 311                 {
 312                         irc::sepstream commands(a->ReplaceFormat, '\n');
 313                         std::string scommand;
 314                         while (commands.GetToken(scommand))
 315                         {
 316                                 DoCommand(scommand, user, c, safe);
 317                         }
 318                         return 1;
 319                 }
 320         }
 321
 322         void DoCommand(std::string newline, User* user, Channel *c, const std::string &original_line)
 323         {
 324                 std::vector<std::string> pars;
 325
 326                 for (int v = 1; v < 10; v++)
 327                 {
 328                         std::string var = "$";
 329                         var.append(ConvToStr(v));
 330                         var.append("-");
 331                         std::string::size_type x = newline.find(var);
 332
 333                         while (x != std::string::npos)
 334                         {
 335                                 newline.erase(x, var.length());
 336                                 newline.insert(x, GetVar(var, original_line));
 337                                 x = newline.find(var);
 338                         }
 339
 340                         var = "$";
 341                         var.append(ConvToStr(v));
 342                         x = newline.find(var);
 343
 344                         while (x != std::string::npos)
 345                         {
 346                                 newline.erase(x, var.length());
 347                                 newline.insert(x, GetVar(var, original_line));
 348                                 x = newline.find(var);
 349                         }
 350                 }
 351
 352                 /* Special variables */
 353                 SearchAndReplace(newline, "$nick", user->nick);
 354                 SearchAndReplace(newline, "$ident", user->ident);
 355                 SearchAndReplace(newline, "$host", user->host);
 356                 SearchAndReplace(newline, "$vhost", user->dhost);
 357
 358                 if (c)
 359                 {
 360                         /* Channel specific variables */
 361                         SearchAndReplace(newline, "$chan", c->name);
 362                 }
 363
 364                 /* Unescape any variable names in the user text before sending */
 365                 SearchAndReplace(newline, "\r", "$");
 366
 367                 irc::tokenstream ss(newline);
 368                 pars.clear();
 369                 std::string command, token;
 370
 371                 ss.GetToken(command);
 372                 while (ss.GetToken(token) && (pars.size() <= MAXPARAMETERS))
 373                 {
 374                         pars.push_back(token);
 375                 }
 376                 ServerInstance->Parser->CallHandler(command, pars, user);
 377         }
 378
 379         virtual void OnRehash(User* user, const std::string &parameter)
 380         {
 381                 ReadAliases();
 382         }
 383 };
 384
 385 MODULE_INIT(ModuleAlias)