src/ngircd/irc-server.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2007 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 for server links
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 static char UNUSED id[] = "$Id: irc-server.c,v 1.45 2007/11/20 20:02:41 alex Exp $";
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <strings.h>
  25
  26 #include "defines.h"
  27 #include "resolve.h"
  28 #include "conn.h"
  29 #include "conn-zip.h"
  30 #include "conf.h"
  31 #include "client.h"
  32 #include "channel.h"
  33 #include "irc-write.h"
  34 #include "lists.h"
  35 #include "log.h"
  36 #include "messages.h"
  37 #include "parse.h"
  38 #include "ngircd.h"
  39
  40 #include "exp.h"
  41 #include "irc-server.h"
  42
  43
  44 #ifdef IRCPLUS
  45 static bool
  46 Synchronize_Lists( CLIENT *Client )
  47 {
  48         CHANNEL *c;
  49         struct list_head *head;
  50         struct list_elem *elem;
  51
  52         assert( Client != NULL );
  53
  54         c = Channel_First();
  55
  56         while (c) {
  57                 head = Channel_GetListBans(c);
  58
  59                 elem = Lists_GetFirst(head);
  60                 while (elem) {
  61                         if( ! IRC_WriteStrClient( Client, "MODE %s +b %s",
  62                                         Channel_Name(c), Lists_GetMask(elem)))
  63                         {
  64                                 return false;
  65                         }
  66                         elem = Lists_GetNext(elem);
  67                 }
  68
  69                 head = Channel_GetListInvites(c);
  70                 elem = Lists_GetFirst(head);
  71                 while (elem) {
  72                         if( ! IRC_WriteStrClient( Client, "MODE %s +I %s",
  73                                         Channel_Name( c ), Lists_GetMask(elem)))
  74                         {
  75                                 return false;
  76                         }
  77                         elem = Lists_GetNext(elem);
  78                 }
  79                 c = Channel_Next(c);
  80         }
  81         return true;
  82 }
  83 #endif
  84
  85
  86 /**
  87  * Handler for the IRC command "SERVER".
  88  * See RFC 2813 section 4.1.2.
  89  */
  90 GLOBAL bool
  91 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  92 {
  93         char str[LINE_LEN], *ptr, *modes, *topic;
  94         CLIENT *from, *c, *cl;
  95         CL2CHAN *cl2chan;
  96         int max_hops, i;
  97         CHANNEL *chan;
  98         bool ok;
  99         CONN_ID con;
 100
 101         assert( Client != NULL );
 102         assert( Req != NULL );
 103
 104         /* Return an error if this is not a local client */
 105         if (Client_Conn(Client) <= NONE)
 106                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
 107                                           Client_ID(Client), Req->command);
 108
 109         if (Client_Type(Client) == CLIENT_GOTPASS) {
 110                 /* We got a PASS command from the peer, and now a SERVER
 111                  * command: the peer tries to register itself as a server. */
 112                 LogDebug("Connection %d: got SERVER command (new server link) ...",
 113                         Client_Conn(Client));
 114
 115                 /* Falsche Anzahl Parameter? */
 116                 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 117
 118                 /* Ist dieser Server bei uns konfiguriert? */
 119                 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
 120                 if( i >= MAX_SERVERS )
 121                 {
 122                         /* Server ist nicht konfiguriert! */
 123                         Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
 124                         Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
 125                         return DISCONNECTED;
 126                 }
 127                 if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
 128                 {
 129                         /* Falsches Passwort */
 130                         Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
 131                         Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
 132                         return DISCONNECTED;
 133                 }
 134
 135                 /* Ist ein Server mit dieser ID bereits registriert? */
 136                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 137
 138                 /* Server-Strukturen fuellen ;-) */
 139                 Client_SetID( Client, Req->argv[0] );
 140                 Client_SetHops( Client, 1 );
 141                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 142
 143                 /* Meldet sich der Server bei uns an (d.h., bauen nicht wir
 144                  * selber die Verbindung zu einem anderen Server auf)? */
 145                 con = Client_Conn( Client );
 146                 if( Client_Token( Client ) != TOKEN_OUTBOUND )
 147                 {
 148                         /* Eingehende Verbindung: Unseren SERVER- und PASS-Befehl senden */
 149                         ok = true;
 150                         if( ! IRC_WriteStrClient( Client, "PASS %s %s", Conf_Server[i].pwd_out, NGIRCd_ProtoID )) ok = false;
 151                         else ok = IRC_WriteStrClient( Client, "SERVER %s 1 :%s", Conf_ServerName, Conf_ServerInfo );
 152                         if( ! ok )
 153                         {
 154                                 Conn_Close( con, "Unexpected server behavior!", NULL, false );
 155                                 return DISCONNECTED;
 156                         }
 157                         Client_SetIntroducer( Client, Client );
 158                         Client_SetToken( Client, 1 );
 159                 }
 160                 else
 161                 {
 162                         /* Ausgehende verbindung, SERVER und PASS wurden von uns bereits
 163                          * an die Gegenseite uerbermittelt */
 164                         Client_SetToken( Client, atoi( Req->argv[1] ));
 165                 }
 166
 167                 Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (connection %d, 1 hop - direct link).", Client_ID( Client ), con );
 168
 169                 Client_SetType( Client, CLIENT_SERVER );
 170                 Conf_SetServer( i, con );
 171
 172 #ifdef ZLIB
 173                 /* Kompression initialisieren, wenn erforderlich */
 174                 if( strchr( Client_Flags( Client ), 'Z' ))
 175                 {
 176                         if( ! Zip_InitConn( con ))
 177                         {
 178                                 /* Fehler! */
 179                                 Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
 180                                 return DISCONNECTED;
 181                         }
 182                 }
 183 #endif
 184
 185                 /* maximalen Hop Count ermitteln */
 186                 max_hops = 0;
 187                 c = Client_First( );
 188                 while( c )
 189                 {
 190                         if( Client_Hops( c ) > max_hops ) max_hops = Client_Hops( c );
 191                         c = Client_Next( c );
 192                 }
 193
 194                 /* Alle bisherigen Server dem neuen Server bekannt machen,
 195                  * die bisherigen Server ueber den neuen informierenn */
 196                 for( i = 0; i < ( max_hops + 1 ); i++ )
 197                 {
 198                         c = Client_First( );
 199                         while( c )
 200                         {
 201                                 if(( Client_Type( c ) == CLIENT_SERVER ) && ( c != Client ) && ( c != Client_ThisServer( )) && ( Client_Hops( c ) == i ))
 202                                 {
 203                                         if( Client_Conn( c ) > NONE )
 204                                         {
 205                                                 /* Dem gefundenen Server gleich den neuen
 206                                                  * Server bekannt machen */
 207                                                 if( ! IRC_WriteStrClient( c, "SERVER %s %d %d :%s", Client_ID( Client ), Client_Hops( Client ) + 1, Client_MyToken( Client ), Client_Info( Client ))) return DISCONNECTED;
 208                                         }
 209
 210                                         /* Inform the new server about this one */
 211                                         if (! IRC_WriteStrClientPrefix(Client,
 212                                                         Client_Hops(c) == 1 ? Client_ThisServer() : Client_TopServer(c),
 213                                                         "SERVER %s %d %d :%s",
 214                                                         Client_ID(c), Client_Hops(c) + 1,
 215                                                         Client_MyToken(c), Client_Info(c)))
 216                                                 return DISCONNECTED;
 217                                 }
 218                                 c = Client_Next( c );
 219                         }
 220                 }
 221
 222                 /* alle User dem neuen Server bekannt machen */
 223                 c = Client_First( );
 224                 while( c )
 225                 {
 226                         if( Client_Type( c ) == CLIENT_USER )
 227                         {
 228                                 /* User an neuen Server melden */
 229                                 if( ! IRC_WriteStrClient( Client, "NICK %s %d %s %s %d +%s :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_User( c ), Client_Hostname( c ), Client_MyToken( Client_Introducer( c )), Client_Modes( c ), Client_Info( c ))) return DISCONNECTED;
 230                         }
 231                         c = Client_Next( c );
 232                 }
 233
 234                 /* Channels dem neuen Server bekannt machen */
 235                 chan = Channel_First( );
 236                 while( chan )
 237                 {
 238 #ifdef IRCPLUS
 239                         /* Send CHANINFO if the peer supports it */
 240                         if( strchr( Client_Flags( Client ), 'C' ))
 241                         {
 242 #ifdef DEBUG
 243                                 Log( LOG_DEBUG, "Sending CHANINFO commands ..." );
 244 #endif
 245                                 modes = Channel_Modes( chan );
 246                                 topic = Channel_Topic( chan );
 247
 248                                 if( *modes || *topic )
 249                                 {
 250                                         /* send CHANINFO */
 251                                         if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )) && ( ! *topic ))
 252                                         {
 253                                                 /* "CHANINFO <chan> +<modes>" */
 254                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s", Channel_Name( chan ), modes )) return DISCONNECTED;
 255                                         }
 256                                         else if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )))
 257                                         {
 258                                                 /* "CHANINFO <chan> +<modes> :<topic>" */
 259                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s :%s", Channel_Name( chan ), modes, topic )) return DISCONNECTED;
 260                                         }
 261                                         else
 262                                         {
 263                                                 /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 264                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s %s %lu :%s",
 265                                                         Channel_Name( chan ), modes,
 266                                                         strchr( Channel_Modes( chan ), 'k' ) ? Channel_Key( chan ) : "*",
 267                                                         strchr( Channel_Modes( chan ), 'l' ) ? Channel_MaxUsers( chan ) : 0, topic ))
 268                                                 {
 269                                                         return DISCONNECTED;
 270                                                 }
 271                                         }
 272                                 }
 273                         }
 274 #endif
 275
 276                         /* alle Member suchen */
 277                         cl2chan = Channel_FirstMember( chan );
 278                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 279                         while( cl2chan )
 280                         {
 281                                 cl = Channel_GetClient( cl2chan );
 282                                 assert( cl != NULL );
 283
 284                                 /* Nick, ggf. mit Modes, anhaengen */
 285                                 if( str[strlen( str ) - 1] != ':' ) strlcat( str, ",", sizeof( str ));
 286                                 if( strchr( Channel_UserModes( chan, cl ), 'v' )) strlcat( str, "+", sizeof( str ));
 287                                 if( strchr( Channel_UserModes( chan, cl ), 'o' )) strlcat( str, "@", sizeof( str ));
 288                                 strlcat( str, Client_ID( cl ), sizeof( str ));
 289
 290                                 if( strlen( str ) > ( LINE_LEN - CLIENT_NICK_LEN - 8 ))
 291                                 {
 292                                         /* Zeile senden */
 293                                         if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 294                                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 295                                 }
 296
 297                                 cl2chan = Channel_NextMember( chan, cl2chan );
 298                         }
 299
 300                         /* noch Daten da? */
 301                         if( str[strlen( str ) - 1] != ':')
 302                         {
 303                                 /* Ja; Also senden ... */
 304                                 if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 305                         }
 306
 307                         /* Get next channel ... */
 308                         chan = Channel_Next(chan);
 309                 }
 310
 311 #ifdef IRCPLUS
 312                 if (strchr(Client_Flags(Client), 'L')) {
 313 #ifdef DEBUG
 314                         Log(LOG_DEBUG,
 315                             "Synchronizing INVITE- and BAN-lists ...");
 316 #endif
 317                         /* Synchronize INVITE- and BAN-lists */
 318                         if (!Synchronize_Lists(Client))
 319                                 return DISCONNECTED;
 320                 }
 321 #endif
 322
 323                 return CONNECTED;
 324         }
 325         else if( Client_Type( Client ) == CLIENT_SERVER )
 326         {
 327                 /* Neuer Server wird im Netz angekuendigt */
 328
 329                 /* Falsche Anzahl Parameter? */
 330                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 331
 332                 /* Ist ein Server mit dieser ID bereits registriert? */
 333                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 334
 335                 /* Ueberfluessige Hostnamen aus Info-Text entfernen */
 336                 ptr = strchr( Req->argv[3] + 2, '[' );
 337                 if( ! ptr ) ptr = Req->argv[3];
 338
 339                 from = Client_Search( Req->prefix );
 340                 if( ! from )
 341                 {
 342                         /* Hm, Server, der diesen einfuehrt, ist nicht bekannt!? */
 343                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 344                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 345                         return DISCONNECTED;
 346                 }
 347
 348                 /* Neue Client-Struktur anlegen */
 349                 c = Client_NewRemoteServer( Client, Req->argv[0], from, atoi( Req->argv[1] ), atoi( Req->argv[2] ), ptr, true);
 350                 if( ! c )
 351                 {
 352                         /* Neue Client-Struktur konnte nicht angelegt werden */
 353                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 354                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 355                         return DISCONNECTED;
 356                 }
 357
 358                 /* Log-Meldung zusammenbauen und ausgeben */
 359                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 360                 else strcpy( str, "" );
 361                 Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (via %s, %s%d hop%s).", Client_ID( c ), Client_ID( Client ), str, Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
 362
 363                 /* Andere Server informieren */
 364                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 365
 366                 return CONNECTED;
 367         }
 368         else return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 369 } /* IRC_SERVER */
 370
 371
 372 GLOBAL bool
 373 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 374 {
 375         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 376         bool is_op, is_voiced;
 377         CHANNEL *chan;
 378         CLIENT *c;
 379
 380         assert( Client != NULL );
 381         assert( Req != NULL );
 382
 383         /* Falsche Anzahl Parameter? */
 384         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 385
 386         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 387         strcpy( nick_out, "" );
 388
 389         channame = Req->argv[0];
 390         ptr = strtok( nick_in, "," );
 391         while( ptr )
 392         {
 393                 is_op = is_voiced = false;
 394
 395                 /* Prefixe abschneiden */
 396                 while(( *ptr == '@' ) || ( *ptr == '+' ))
 397                 {
 398                         if( *ptr == '@' ) is_op = true;
 399                         if( *ptr == '+' ) is_voiced = true;
 400                         ptr++;
 401                 }
 402
 403                 c = Client_Search( ptr );
 404                 if( c )
 405                 {
 406                         Channel_Join( c, channame );
 407                         chan = Channel_Search( channame );
 408                         assert( chan != NULL );
 409
 410                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 411                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 412
 413                         /* im Channel bekannt machen */
 414                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 415
 416                         /* Channel-User-Modes setzen */
 417                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 418                         if( modes[0] )
 419                         {
 420                                 /* Modes im Channel bekannt machen */
 421                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 422                         }
 423
 424                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 425                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 426                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 427                         strlcat( nick_out, ptr, sizeof( nick_out ));
 428                 }
 429                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 430
 431                 /* naechsten Nick suchen */
 432                 ptr = strtok( NULL, "," );
 433         }
 434
 435         /* an andere Server weiterleiten */
 436         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 437
 438         return CONNECTED;
 439 } /* IRC_NJOIN */
 440
 441
 442 GLOBAL bool
 443 IRC_SQUIT( CLIENT *Client, REQUEST *Req )
 444 {
 445         CLIENT *target;
 446         char msg[LINE_LEN + 64];
 447
 448         assert( Client != NULL );
 449         assert( Req != NULL );
 450
 451         /* Falsche Anzahl Parameter? */
 452         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 453
 454         Log( LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...", Client_ID( Client ), Req->argv[0], Req->argv[1] );
 455
 456         target = Client_Search( Req->argv[0] );
 457         if( ! target )
 458         {
 459                 /* Den Server kennen wir nicht (mehr), also nichts zu tun. */
 460                 Log( LOG_WARNING, "Got SQUIT from %s for unknown server \"%s\"!?", Client_ID( Client ), Req->argv[0] );
 461                 return CONNECTED;
 462         }
 463
 464         if( Req->argv[1][0] )
 465         {
 466                 if( strlen( Req->argv[1] ) > LINE_LEN ) Req->argv[1][LINE_LEN] = '\0';
 467                 snprintf( msg, sizeof( msg ), "%s (SQUIT from %s).", Req->argv[1], Client_ID( Client ));
 468         }
 469         else snprintf( msg, sizeof( msg ), "Got SQUIT from %s.", Client_ID( Client ));
 470
 471         if( Client_Conn( target ) > NONE )
 472         {
 473                 /* dieser Server hat die Connection */
 474                 if( Req->argv[1][0] ) Conn_Close( Client_Conn( target ), msg, Req->argv[1], true);
 475                 else Conn_Close( Client_Conn( target ), msg, NULL, true);
 476                 return DISCONNECTED;
 477         }
 478         else
 479         {
 480                 /* Verbindung hielt anderer Server */
 481                 Client_Destroy( target, msg, Req->argv[1], false );
 482                 return CONNECTED;
 483         }
 484 } /* IRC_SQUIT */
 485
 486
 487 /* -eof- */