src/modules/m_alias.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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
  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
  55         char fprefix;
  56
  57         /* We cant use a map, there may be multiple aliases with the same name.
  58          * We can, however, use a fancy invention: the multimap. Maps a key to one or more values.
  59          *              -- w00t
  60    */
  61         std::multimap<irc::string, Alias> Aliases;
  62
  63         /* whether or not +B users are allowed to use fantasy commands */
  64         bool AllowBots;
  65
  66         virtual void ReadAliases()
  67         {
  68                 ConfigReader MyConf;
  69
  70                 AllowBots = MyConf.ReadFlag("fantasy", "allowbots", "no", 0);
  71
  72                 std::string fpre = MyConf.ReadValue("fantasy","prefix",0);
  73                 fprefix = fpre.empty() ? '!' : fpre[0];
  74
  75                 Aliases.clear();
  76                 for (int i = 0;; i++)
  77                 {
  78                         ConfigTag* tag = ServerInstance->Config->ConfValue("alias", i);
  79                         if (!tag)
  80                                 break;
  81                         Alias a;
  82                         a.AliasedCommand = tag->getString("text").c_str();
  83                         tag->readString("replace", a.ReplaceFormat, true);
  84                         a.RequiredNick = tag->getString("requires");
  85                         a.ULineOnly = tag->getBool("uline");
  86                         a.ChannelCommand = tag->getBool("channelcommand", "no");
  87                         a.UserCommand = tag->getBool("usercommand", "yes");
  88                         a.OperOnly = tag->getBool("operonly");
  89                         a.format = tag->getString("format");
  90                         a.CaseSensitive = tag->getBool("matchcase");
  91                         Aliases.insert(std::make_pair(a.AliasedCommand, a));
  92                 }
  93         }
  94
  95  public:
  96
  97         ModuleAlias()
  98         {
  99                 ReadAliases();
 100                 ServerInstance->Modules->Attach(I_OnPreCommand, this);
 101                 ServerInstance->Modules->Attach(I_OnRehash, this);
 102                 ServerInstance->Modules->Attach(I_OnUserMessage, this);
 103         }
 104
 105         virtual ~ModuleAlias()
 106         {
 107         }
 108
 109         virtual Version GetVersion()
 110         {
 111                 return Version("Provides aliases of commands.", VF_VENDOR);
 112         }
 113
 114         std::string GetVar(std::string varname, const std::string &original_line)
 115         {
 116                 irc::spacesepstream ss(original_line);
 117                 varname.erase(varname.begin());
 118                 int index = *(varname.begin()) - 48;
 119                 varname.erase(varname.begin());
 120                 bool everything_after = (varname == "-");
 121                 std::string word;
 122
 123                 for (int j = 0; j < index; j++)
 124                         ss.GetToken(word);
 125
 126                 if (everything_after)
 127                 {
 128                         std::string more;
 129                         while (ss.GetToken(more))
 130                         {
 131                                 word.append(" ");
 132                                 word.append(more);
 133                         }
 134                 }
 135
 136                 return word;
 137         }
 138
 139         virtual ModResult OnPreCommand(std::string &command, std::vector<std::string> &parameters, User *user, bool validated, const std::string &original_line)
 140         {
 141                 std::multimap<irc::string, Alias>::iterator i, upperbound;
 142
 143                 /* If theyre not registered yet, we dont want
 144                  * to know.
 145                  */
 146                 if (user->registered != REG_ALL)
 147                         return MOD_RES_PASSTHRU;
 148
 149                 /* We dont have any commands looking like this? Stop processing. */
 150                 i = Aliases.find(command.c_str());
 151                 if (i == Aliases.end())
 152                         return MOD_RES_PASSTHRU;
 153                 /* Avoid iterating on to different aliases if no patterns match. */
 154                 upperbound = Aliases.upper_bound(command.c_str());
 155
 156                 irc::string c = command.c_str();
 157                 /* The parameters for the command in their original form, with the command stripped off */
 158                 std::string compare = original_line.substr(command.length());
 159                 while (*(compare.c_str()) == ' ')
 160                         compare.erase(compare.begin());
 161
 162                 while (i != upperbound)
 163                 {
 164                         if (i->second.UserCommand)
 165                         {
 166                                 if (DoAlias(user, NULL, &(i->second), compare, original_line))
 167                                 {
 168                                         return MOD_RES_DENY;
 169                                 }
 170                         }
 171
 172                         i++;
 173                 }
 174
 175                 // If we made it here, no aliases actually matched.
 176                 return MOD_RES_PASSTHRU;
 177         }
 178
 179         virtual void OnUserMessage(User *user, void *dest, int target_type, const std::string &text, char status, const CUList &exempt_list)
 180         {
 181                 if (target_type != TYPE_CHANNEL)
 182                 {
 183                         return;
 184                 }
 185
 186                 // fcommands are only for local users. Spanningtree will send them back out as their original cmd.
 187                 if (!user || !IS_LOCAL(user))
 188                 {
 189                         return;
 190                 }
 191
 192                 /* Stop here if the user is +B and allowbot is set to no. */
 193                 if (!AllowBots && user->IsModeSet('B'))
 194                 {
 195                         return;
 196                 }
 197
 198                 Channel *c = (Channel *)dest;
 199                 std::string scommand;
 200
 201                 // text is like "!moo cows bite me", we want "!moo" first
 202                 irc::spacesepstream ss(text);
 203                 ss.GetToken(scommand);
 204                 irc::string fcommand = scommand.c_str();
 205
 206                 if (fcommand.empty())
 207                 {
 208                         return; // wtfbbq
 209                 }
 210
 211                 // we don't want to touch non-fantasy stuff
 212                 if (*fcommand.c_str() != fprefix)
 213                 {
 214                         return;
 215                 }
 216
 217                 // nor do we give a shit about the prefix
 218                 fcommand.erase(fcommand.begin());
 219
 220                 std::multimap<irc::string, Alias>::iterator i = Aliases.find(fcommand);
 221
 222                 if (i == Aliases.end())
 223                         return;
 224
 225                 /* Avoid iterating on to other aliases if no patterns match */
 226                 std::multimap<irc::string, Alias>::iterator upperbound = Aliases.upper_bound(fcommand);
 227
 228
 229                 /* The parameters for the command in their original form, with the command stripped off */
 230                 std::string compare = text.substr(fcommand.length() + 1);
 231                 while (*(compare.c_str()) == ' ')
 232                         compare.erase(compare.begin());
 233
 234                 while (i != upperbound)
 235                 {
 236                         if (i->second.ChannelCommand)
 237                         {
 238                                 // We use substr(1) here to remove the fantasy prefix
 239                                 if (DoAlias(user, c, &(i->second), compare, text.substr(1)))
 240                                         return;
 241                         }
 242
 243                         i++;
 244                 }
 245         }
 246
 247
 248         int DoAlias(User *user, Channel *c, Alias *a, const std::string compare, const std::string safe)
 249         {
 250                 User *u = NULL;
 251
 252                 /* Does it match the pattern? */
 253                 if (!a->format.empty())
 254                 {
 255                         if (a->CaseSensitive)
 256                         {
 257                                 if (!InspIRCd::Match(compare, a->format, rfc_case_sensitive_map))
 258                                         return 0;
 259                         }
 260                         else
 261                         {
 262                                 if (!InspIRCd::Match(compare, a->format))
 263                                         return 0;
 264                         }
 265                 }
 266
 267                 if ((a->OperOnly) && (!IS_OPER(user)))
 268                         return 0;
 269
 270                 if (!a->RequiredNick.empty())
 271                 {
 272                         u = ServerInstance->FindNick(a->RequiredNick);
 273                         if (!u)
 274                         {
 275                                 user->WriteNumeric(401, ""+std::string(user->nick)+" "+a->RequiredNick+" :is currently unavailable. Please try again later.");
 276                                 return 1;
 277                         }
 278                 }
 279                 if ((u != NULL) && (!a->RequiredNick.empty()) && (a->ULineOnly))
 280                 {
 281                         if (!ServerInstance->ULine(u->server))
 282                         {
 283                                 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!");
 284                                 user->WriteNumeric(401, ""+std::string(user->nick)+" "+a->RequiredNick+" :is an imposter! Please inform an IRC operator as soon as possible.");
 285                                 return 1;
 286                         }
 287                 }
 288
 289                 /* Now, search and replace in a copy of the original_line, replacing $1 through $9 and $1- etc */
 290
 291                 std::string::size_type crlf = a->ReplaceFormat.find('\n');
 292
 293                 if (crlf == std::string::npos)
 294                 {
 295                         DoCommand(a->ReplaceFormat, user, c, safe);
 296                         return 1;
 297                 }
 298                 else
 299                 {
 300                         irc::sepstream commands(a->ReplaceFormat, '\n');
 301                         std::string scommand;
 302                         while (commands.GetToken(scommand))
 303                         {
 304                                 DoCommand(scommand, user, c, safe);
 305                         }
 306                         return 1;
 307                 }
 308         }
 309
 310         void DoCommand(const std::string& newline, User* user, Channel *chan, const std::string &original_line)
 311         {
 312                 std::string result;
 313                 result.reserve(MAXBUF);
 314                 for (unsigned int i = 0; i < newline.length(); i++)
 315                 {
 316                         char c = newline[i];
 317                         if (c == '$')
 318                         {
 319                                 if (isdigit(newline[i+1]))
 320                                 {
 321                                         int len = (newline[i+2] == '-') ? 3 : 2;
 322                                         std::string var = newline.substr(i, len);
 323                                         result.append(GetVar(var, original_line));
 324                                         i += len - 1;
 325                                 }
 326                                 else if (newline.substr(i, 5) == "$nick")
 327                                 {
 328                                         result.append(user->nick);
 329                                         i += 4;
 330                                 }
 331                                 else if (newline.substr(i, 5) == "$host")
 332                                 {
 333                                         result.append(user->host);
 334                                         i += 4;
 335                                 }
 336                                 else if (newline.substr(i, 5) == "$chan")
 337                                 {
 338                                         if (chan)
 339                                                 result.append(chan->name);
 340                                         i += 4;
 341                                 }
 342                                 else if (newline.substr(i, 6) == "$ident")
 343                                 {
 344                                         result.append(user->ident);
 345                                         i += 5;
 346                                 }
 347                                 else if (newline.substr(i, 6) == "$vhost")
 348                                 {
 349                                         result.append(user->dhost);
 350                                         i += 5;
 351                                 }
 352                                 else
 353                                         result.push_back(c);
 354                         }
 355                         else
 356                                 result.push_back(c);
 357                 }
 358
 359                 irc::tokenstream ss(result);
 360                 std::vector<std::string> pars;
 361                 std::string command, token;
 362
 363                 ss.GetToken(command);
 364                 while (ss.GetToken(token) && (pars.size() <= MAXPARAMETERS))
 365                 {
 366                         pars.push_back(token);
 367                 }
 368                 ServerInstance->Parser->CallHandler(command, pars, user);
 369         }
 370
 371         virtual void OnRehash(User* user)
 372         {
 373                 ReadAliases();
 374         }
 375
 376         virtual void Prioritize()
 377         {
 378                 // Prioritise after spanningtree so that channel aliases show the alias before the effects.
 379                 Module* linkmod = ServerInstance->Modules->Find("m_spanningtree.so");
 380                 ServerInstance->Modules->SetPriority(this, I_OnUserMessage, PRIORITY_AFTER, &linkmod);
 381         }
 382 };
 383
 384 MODULE_INIT(ModuleAlias)