src/ngircd/irc.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2004 Alexander Barton <alex@barton.de>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  *
  11  * IRC commands
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 static char UNUSED id[] = "$Id: irc.c,v 1.132 2008/01/15 22:28:14 fw Exp $";
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "ngircd.h"
  25 #include "resolve.h"
  26 #include "conn-func.h"
  27 #include "conf.h"
  28 #include "client.h"
  29 #include "channel.h"
  30 #include "defines.h"
  31 #include "irc-write.h"
  32 #include "log.h"
  33 #include "match.h"
  34 #include "messages.h"
  35 #include "parse.h"
  36
  37 #include "exp.h"
  38 #include "irc.h"
  39
  40
  41 static char *Option_String PARAMS((CONN_ID Idx));
  42 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType, bool SendErrors));
  43 static bool Send_Message_Mask PARAMS((CLIENT *from, char *targetMask, char *message, bool SendErrors));
  44
  45
  46 GLOBAL bool
  47 IRC_ERROR( CLIENT *Client, REQUEST *Req )
  48 {
  49         assert( Client != NULL );
  50         assert( Req != NULL );
  51
  52         if( Req->argc < 1 ) Log( LOG_NOTICE, "Got ERROR from \"%s\"!", Client_Mask( Client ));
  53         else Log( LOG_NOTICE, "Got ERROR from \"%s\": %s!", Client_Mask( Client ), Req->argv[0] );
  54
  55         return CONNECTED;
  56 } /* IRC_ERROR */
  57
  58
  59 /**
  60  * Kill client on request.
  61  * This function implements the IRC command "KILL" wich is used to selectively
  62  * disconnect clients. It can be used by IRC operators and servers, for example
  63  * to "solve" nick collisions after netsplits.
  64  * Please note that this function is also called internally, without a real
  65  * KILL command beeing received over the network! Client is Client_ThisServer()
  66  * in this case. */
  67 GLOBAL bool
  68 IRC_KILL( CLIENT *Client, REQUEST *Req )
  69 {
  70         CLIENT *prefix, *c;
  71         char reason[COMMAND_LEN], *msg;
  72         CONN_ID my_conn, conn;
  73
  74         assert( Client != NULL );
  75         assert( Req != NULL );
  76
  77         if(( Client_Type( Client ) != CLIENT_SERVER ) &&
  78            ( ! Client_OperByMe( Client )))
  79         {
  80                 /* The originator of the KILL is neither an IRC operator of
  81                  * this server nor a server. */
  82                 return IRC_WriteStrClient( Client, ERR_NOPRIVILEGES_MSG,
  83                                            Client_ID( Client ));
  84         }
  85
  86         if( Req->argc != 2 )
  87         {
  88                 /* This command requires exactly 2 parameters! */
  89                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
  90                                            Client_ID( Client ), Req->command );
  91         }
  92
  93         if( Req->prefix ) prefix = Client_Search( Req->prefix );
  94         else prefix = Client;
  95         if( ! prefix )
  96         {
  97                 Log( LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
  98                      Req->prefix );
  99                 prefix = Client_ThisServer( );
 100         }
 101
 102         if( Client != Client_ThisServer( ))
 103         {
 104                 /* This is a "real" KILL received from the network. */
 105                 Log( LOG_NOTICE|LOG_snotice, "Got KILL command from \"%s\" for \"%s\": %s",
 106                      Client_Mask( prefix ), Req->argv[0], Req->argv[1] );
 107         }
 108
 109         /* Build reason string */
 110         if( Client_Type( Client ) == CLIENT_USER )
 111         {
 112                 /* Prefix the "reason" if the originator is a regular user,
 113                  * so users can't spoof KILLs of servers. */
 114                 snprintf( reason, sizeof( reason ), "KILLed by %s: %s",
 115                           Client_ID( Client ), Req->argv[1] );
 116         }
 117         else
 118                 strlcpy( reason, Req->argv[1], sizeof( reason ));
 119
 120         /* Inform other servers */
 121         IRC_WriteStrServersPrefix( Client, prefix, "KILL %s :%s",
 122                                    Req->argv[0], reason );
 123
 124         /* Save ID of this connection */
 125         my_conn = Client_Conn( Client );
 126
 127         /* Do we host such a client? */
 128         c = Client_Search( Req->argv[0] );
 129         if( c )
 130         {
 131                 if(( Client_Type( c ) != CLIENT_USER ) &&
 132                    ( Client_Type( c ) != CLIENT_GOTNICK ))
 133                 {
 134                         /* Target of this KILL is not a regular user, this is
 135                          * invalid! So we ignore this case if we received a
 136                          * regular KILL from the network and try to kill the
 137                          * client/connection anyway (but log an error!) if the
 138                          * origin is the local server. */
 139
 140                         if( Client != Client_ThisServer( ))
 141                         {
 142                                 /* Invalid KILL received from remote */
 143                                 if( Client_Type( c ) == CLIENT_SERVER )
 144                                         msg = ERR_CANTKILLSERVER_MSG;
 145                                 else
 146                                         msg = ERR_NOPRIVILEGES_MSG;
 147                                 return IRC_WriteStrClient( Client, msg,
 148                                         Client_ID( Client ));
 149                         }
 150
 151                         Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
 152                              Client_Type( c ), Req->argv[0] );
 153                 }
 154
 155                 /* Kill client NOW! */
 156                 conn = Client_Conn( c );
 157                 Client_Destroy( c, NULL, reason, false );
 158                 if( conn > NONE )
 159                         Conn_Close( conn, NULL, reason, true );
 160         }
 161         else
 162                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 163
 164         /* Are we still connected or were we killed, too? */
 165         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 166                 return CONNECTED;
 167         else
 168                 return DISCONNECTED;
 169 } /* IRC_KILL */
 170
 171
 172 /**
 173  * Handler for the IRC command NOTICE.
 174  */
 175 GLOBAL bool
 176 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 177 {
 178         return Send_Message(Client, Req, CLIENT_USER, false);
 179 } /* IRC_NOTICE */
 180
 181
 182 /**
 183  * Handler for the IRC command PRIVMSG.
 184  */
 185 GLOBAL bool
 186 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 187 {
 188         return Send_Message(Client, Req, CLIENT_USER, true);
 189 } /* IRC_PRIVMSG */
 190
 191
 192 /**
 193  * Handler for the IRC command SQUERY.
 194  */
 195 GLOBAL bool
 196 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 197 {
 198         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 199 } /* IRC_SQUERY */
 200
 201
 202 GLOBAL bool
 203 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 204 {
 205         CLIENT *from, *target, *c;
 206         CONN_ID idx, idx2;
 207         char user[CLIENT_USER_LEN];
 208
 209         assert( Client != NULL );
 210         assert( Req != NULL );
 211
 212         /* Bad number of arguments? */
 213         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 214
 215         /* Search sender */
 216         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 217         else from = Client;
 218         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 219
 220         /* Search target */
 221         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 222         else target = Client_ThisServer( );
 223
 224         /* Forward command to other server? */
 225         if( target != Client_ThisServer( ))
 226         {
 227                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 228
 229                 /* Send RPL_TRACELINK back to initiator */
 230                 idx = Client_Conn( Client ); assert( idx > NONE );
 231                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 232                 if( ! IRC_WriteStrClient( from, RPL_TRACELINK_MSG, Client_ID( from ), PACKAGE_NAME, PACKAGE_VERSION, Client_ID( target ), Client_ID( Client_NextHop( target )), Option_String( idx2 ), time( NULL ) - Conn_StartTime( idx2 ), Conn_SendQ( idx ), Conn_SendQ( idx2 ))) return DISCONNECTED;
 233
 234                 /* Forward command */
 235                 IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
 236                 return CONNECTED;
 237         }
 238
 239         /* Infos about all connected servers */
 240         c = Client_First( );
 241         while( c )
 242         {
 243                 if( Client_Conn( c ) > NONE )
 244                 {
 245                         /* Local client */
 246                         if( Client_Type( c ) == CLIENT_SERVER )
 247                         {
 248                                 /* Server link */
 249                                 strlcpy( user, Client_User( c ), sizeof( user ));
 250                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 251                                 if( ! IRC_WriteStrClient( from, RPL_TRACESERVER_MSG, Client_ID( from ), Client_ID( c ), user, Client_Hostname( c ), Client_Mask( Client_ThisServer( )), Option_String( Client_Conn( c )))) return DISCONNECTED;
 252                         }
 253                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 254                         {
 255                                 /* IRC Operator */
 256                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 257                         }
 258                 }
 259                 c = Client_Next( c );
 260         }
 261
 262         IRC_SetPenalty( Client, 3 );
 263         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 264 } /* IRC_TRACE */
 265
 266
 267 GLOBAL bool
 268 IRC_HELP( CLIENT *Client, REQUEST *Req )
 269 {
 270         COMMAND *cmd;
 271
 272         assert( Client != NULL );
 273         assert( Req != NULL );
 274
 275         /* Bad number of arguments? */
 276         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 277
 278         cmd = Parse_GetCommandStruct( );
 279         while( cmd->name )
 280         {
 281                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 282                 cmd++;
 283         }
 284
 285         IRC_SetPenalty( Client, 2 );
 286         return CONNECTED;
 287 } /* IRC_HELP */
 288
 289
 290 static char *
 291 Option_String( CONN_ID Idx )
 292 {
 293         static char option_txt[8];
 294         UINT16 options;
 295
 296         options = Conn_Options(Idx);
 297
 298         strcpy(option_txt, "F");        /* No idea what this means, but the
 299                                          * original ircd sends it ... */
 300 #ifdef ZLIB
 301         if(options & CONN_ZIP)          /* zlib compression supported. */
 302                 strcat(option_txt, "z");
 303 #endif
 304
 305         return option_txt;
 306 } /* Option_String */
 307
 308
 309 static bool
 310 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 311 {
 312         CLIENT *cl, *from;
 313         CHANNEL *chan;
 314         char *currentTarget = Req->argv[0];
 315         char *lastCurrentTarget = NULL;
 316
 317         assert(Client != NULL);
 318         assert(Req != NULL);
 319
 320         if (Req->argc == 0) {
 321                 if (!SendErrors)
 322                         return true;
 323                 return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
 324                                           Client_ID(Client), Req->command);
 325         }
 326         if (Req->argc == 1) {
 327                 if (!SendErrors)
 328                         return true;
 329                 return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
 330                                           Client_ID(Client));
 331         }
 332         if (Req->argc > 2) {
 333                 if (!SendErrors)
 334                         return true;
 335                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 336                                           Client_ID(Client), Req->command);
 337         }
 338
 339         if (Client_Type(Client) == CLIENT_SERVER)
 340                 from = Client_Search(Req->prefix);
 341         else
 342                 from = Client;
 343         if (!from)
 344                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 345                                           Client_ID(Client), Req->prefix);
 346
 347         /* handle msgtarget = msgto *("," msgto) */
 348         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 349
 350         while (currentTarget) {
 351                 /* Check for and handle valid <msgto> of form:
 352                  * RFC 2812 2.3.1:
 353                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 354                  *   msgto =/ ( user "%" host ) / targetmask
 355                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 356                  */
 357                 if (strchr(currentTarget, '!') == NULL)
 358                         /* nickname */
 359                         cl = Client_Search(currentTarget);
 360                 else
 361                         cl = NULL;
 362
 363                 if (cl == NULL) {
 364                         /* If currentTarget isn't a nickname check for:
 365                          * user ["%" host] "@" servername
 366                          * user "%" host
 367                          * nickname "!" user "@" host
 368                          */
 369                         char target[COMMAND_LEN];
 370                         char * nick = NULL;
 371                         char * user = NULL;
 372                         char * host = NULL;
 373                         char * server = NULL;
 374
 375                         strlcpy(target, currentTarget, COMMAND_LEN);
 376                         server = strchr(target, '@');
 377                         if (server) {
 378                                 *server = '\0';
 379                                 server++;
 380                         }
 381                         host = strchr(target, '%');
 382                         if (host) {
 383                                 *host = '\0';
 384                                 host++;
 385                         }
 386                         user = strchr(target, '!');
 387                         if (user) {
 388                                 /* msgto form: nick!user@host */
 389                                 *user = '\0';
 390                                 user++;
 391                                 nick = target;
 392                                 host = server; /* not "@server" but "@host" */
 393                         } else {
 394                                 user = target;
 395                         }
 396
 397                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 398                                 if (Client_Type(cl) != CLIENT_USER)
 399                                         continue;
 400                                 if (nick != NULL && host != NULL) {
 401                                         if (strcmp(nick, Client_ID(cl)) == 0 &&
 402                                             strcmp(user, Client_User(cl)) == 0 &&
 403                                             strcasecmp(host, Client_Hostname(cl)) == 0)
 404                                                 break;
 405                                         else
 406                                                 continue;
 407                                 }
 408                                 if (strcasecmp(user, Client_User(cl)) != 0)
 409                                         continue;
 410                                 if (host != NULL && strcasecmp(host,
 411                                                 Client_Hostname(cl)) != 0)
 412                                         continue;
 413                                 if (server != NULL && strcasecmp(server,
 414                                                 Client_ID(Client_Introducer(cl))) != 0)
 415                                         continue;
 416                                 break;
 417                         }
 418                 }
 419
 420                 if (cl) {
 421                         /* Target is a user, enforce type */
 422                         if (Client_Type(cl) != ForceType) {
 423                                 if (!SendErrors)
 424                                         return true;
 425                                 if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 426                                                           Client_ID(from),
 427                                                           currentTarget))
 428                                         return false;
 429                         } else if (SendErrors
 430                                    && (Client_Type(Client) != CLIENT_SERVER)
 431                                    && strchr(Client_Modes(cl), 'a')) {
 432                                 /* Target is away */
 433                                 if (!SendErrors)
 434                                         return true;
 435                                 if (!IRC_WriteStrClient
 436                                     (from, RPL_AWAY_MSG, Client_ID(from),
 437                                      Client_ID(cl), Client_Away(cl)))
 438                                         return DISCONNECTED;
 439                         }
 440                         if (Client_Conn(from) > NONE) {
 441                                 Conn_UpdateIdle(Client_Conn(from));
 442                         }
 443                         if (!IRC_WriteStrClientPrefix(cl, from, "PRIVMSG %s :%s",
 444                                                 Client_ID(cl), Req->argv[1]))
 445                                 return false;
 446                 } else if (strchr("$#", currentTarget[0])
 447                            && strchr(currentTarget, '.')) {
 448                         /* targetmask */
 449                         if (!Send_Message_Mask(from, currentTarget,
 450                                                Req->argv[1], SendErrors))
 451                                 return false;
 452                 } else if ((chan = Channel_Search(currentTarget))) {
 453                         /* channel */
 454                         if (!Channel_Write(chan, from, Client, Req->argv[1]))
 455                                 return false;
 456                 } else {
 457                         if (!SendErrors)
 458                                 return true;
 459                         if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 460                                                 Client_ID(from), currentTarget))
 461                                 return false;
 462                 }
 463
 464                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 465         }
 466
 467         return CONNECTED;
 468 } /* Send_Message */
 469
 470
 471 static bool
 472 Send_Message_Mask(CLIENT * from, char * targetMask, char * message, bool SendErrors)
 473 {
 474         CLIENT *cl;
 475         bool client_match;
 476         char *mask = targetMask + 1;
 477
 478         cl = NULL;
 479
 480         if (strchr(Client_Modes(from), 'o') == NULL) {
 481                 if (!SendErrors)
 482                         return true;
 483                 return IRC_WriteStrClient(from, ERR_NOPRIVILEGES_MSG,
 484                                           Client_ID(from));
 485         }
 486
 487         if (targetMask[0] == '#') {
 488                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 489                         if (Client_Type(cl) != CLIENT_USER)
 490                                 continue;
 491                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 492                         if (client_match)
 493                                 if (!IRC_WriteStrClientPrefix(cl, from, "PRIVMSG %s :%s",
 494                                                         Client_ID(cl), message))
 495                                         return false;
 496                 }
 497         } else {
 498                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 499                         if (Client_Type(cl) != CLIENT_USER)
 500                                 continue;
 501                         client_match = MatchCaseInsensitive(mask,
 502                                         Client_ID(Client_Introducer(cl)));
 503                         if (client_match)
 504                                 if (!IRC_WriteStrClientPrefix(cl, from, "PRIVMSG %s :%s",
 505                                                         Client_ID(cl), message))
 506                                         return false;
 507                 }
 508         }
 509         return CONNECTED;
 510 } /* Send_Message_Mask */
 511
 512
 513 /* -eof- */