src/ngircd/irc-server.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2006 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 1.43 2006/12/07 17:57:20 fw 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
  88 /**
  89  * Handler for the IRC command "SERVER".
  90  * See RFC 2813 section 4.1.2.
  91  */
  92 GLOBAL bool
  93 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  94 {
  95         char str[LINE_LEN], *ptr, *modes, *topic;
  96         CLIENT *from, *c, *cl;
  97         CL2CHAN *cl2chan;
  98         int max_hops, i;
  99         CHANNEL *chan;
 100         bool ok;
 101         CONN_ID con;
 102
 103         assert( Client != NULL );
 104         assert( Req != NULL );
 105
 106         /* Return an error if this is not a local client */
 107         if (Client_Conn(Client) <= NONE)
 108                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
 109                                           Client_ID(Client), Req->command);
 110
 111         if (Client_Type(Client) == CLIENT_GOTPASS) {
 112                 /* We got a PASS command from the peer, and now a SERVER
 113                  * command: the peer tries to register itself as a server. */
 114                 LogDebug("Connection %d: got SERVER command (new server link) ...",
 115                         Client_Conn(Client));
 116
 117                 /* Falsche Anzahl Parameter? */
 118                 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 119
 120                 /* Ist dieser Server bei uns konfiguriert? */
 121                 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
 122                 if( i >= MAX_SERVERS )
 123                 {
 124                         /* Server ist nicht konfiguriert! */
 125                         Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
 126                         Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
 127                         return DISCONNECTED;
 128                 }
 129                 if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
 130                 {
 131                         /* Falsches Passwort */
 132                         Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
 133                         Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
 134                         return DISCONNECTED;
 135                 }
 136
 137                 /* Ist ein Server mit dieser ID bereits registriert? */
 138                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 139
 140                 /* Server-Strukturen fuellen ;-) */
 141                 Client_SetID( Client, Req->argv[0] );
 142                 Client_SetHops( Client, 1 );
 143                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 144
 145                 /* Meldet sich der Server bei uns an (d.h., bauen nicht wir
 146                  * selber die Verbindung zu einem anderen Server auf)? */
 147                 con = Client_Conn( Client );
 148                 if( Client_Token( Client ) != TOKEN_OUTBOUND )
 149                 {
 150                         /* Eingehende Verbindung: Unseren SERVER- und PASS-Befehl senden */
 151                         ok = true;
 152                         if( ! IRC_WriteStrClient( Client, "PASS %s %s", Conf_Server[i].pwd_out, NGIRCd_ProtoID )) ok = false;
 153                         else ok = IRC_WriteStrClient( Client, "SERVER %s 1 :%s", Conf_ServerName, Conf_ServerInfo );
 154                         if( ! ok )
 155                         {
 156                                 Conn_Close( con, "Unexpected server behavior!", NULL, false );
 157                                 return DISCONNECTED;
 158                         }
 159                         Client_SetIntroducer( Client, Client );
 160                         Client_SetToken( Client, 1 );
 161                 }
 162                 else
 163                 {
 164                         /* Ausgehende verbindung, SERVER und PASS wurden von uns bereits
 165                          * an die Gegenseite uerbermittelt */
 166                         Client_SetToken( Client, atoi( Req->argv[1] ));
 167                 }
 168
 169                 Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (connection %d, 1 hop - direct link).", Client_ID( Client ), con );
 170
 171                 Client_SetType( Client, CLIENT_SERVER );
 172                 Conf_SetServer( i, con );
 173
 174 #ifdef ZLIB
 175                 /* Kompression initialisieren, wenn erforderlich */
 176                 if( strchr( Client_Flags( Client ), 'Z' ))
 177                 {
 178                         if( ! Zip_InitConn( con ))
 179                         {
 180                                 /* Fehler! */
 181                                 Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
 182                                 return DISCONNECTED;
 183                         }
 184                 }
 185 #endif
 186
 187                 /* maximalen Hop Count ermitteln */
 188                 max_hops = 0;
 189                 c = Client_First( );
 190                 while( c )
 191                 {
 192                         if( Client_Hops( c ) > max_hops ) max_hops = Client_Hops( c );
 193                         c = Client_Next( c );
 194                 }
 195
 196                 /* Alle bisherigen Server dem neuen Server bekannt machen,
 197                  * die bisherigen Server ueber den neuen informierenn */
 198                 for( i = 0; i < ( max_hops + 1 ); i++ )
 199                 {
 200                         c = Client_First( );
 201                         while( c )
 202                         {
 203                                 if(( Client_Type( c ) == CLIENT_SERVER ) && ( c != Client ) && ( c != Client_ThisServer( )) && ( Client_Hops( c ) == i ))
 204                                 {
 205                                         if( Client_Conn( c ) > NONE )
 206                                         {
 207                                                 /* Dem gefundenen Server gleich den neuen
 208                                                  * Server bekannt machen */
 209                                                 if( ! IRC_WriteStrClient( c, "SERVER %s %d %d :%s", Client_ID( Client ), Client_Hops( Client ) + 1, Client_MyToken( Client ), Client_Info( Client ))) return DISCONNECTED;
 210                                         }
 211
 212                                         /* Den neuen Server ueber den alten informieren */
 213                                         if( ! IRC_WriteStrClientPrefix( Client, Client_Hops( c ) == 1 ? Client_ThisServer( ) : Client_Introducer( c ), "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ))) return DISCONNECTED;
 214                                 }
 215                                 c = Client_Next( c );
 216                         }
 217                 }
 218
 219                 /* alle User dem neuen Server bekannt machen */
 220                 c = Client_First( );
 221                 while( c )
 222                 {
 223                         if( Client_Type( c ) == CLIENT_USER )
 224                         {
 225                                 /* User an neuen Server melden */
 226                                 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;
 227                         }
 228                         c = Client_Next( c );
 229                 }
 230
 231                 /* Channels dem neuen Server bekannt machen */
 232                 chan = Channel_First( );
 233                 while( chan )
 234                 {
 235 #ifdef IRCPLUS
 236                         /* Send CHANINFO if the peer supports it */
 237                         if( strchr( Client_Flags( Client ), 'C' ))
 238                         {
 239 #ifdef DEBUG
 240                                 Log( LOG_DEBUG, "Sending CHANINFO commands ..." );
 241 #endif
 242                                 modes = Channel_Modes( chan );
 243                                 topic = Channel_Topic( chan );
 244
 245                                 if( *modes || *topic )
 246                                 {
 247                                         /* send CHANINFO */
 248                                         if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )) && ( ! *topic ))
 249                                         {
 250                                                 /* "CHANINFO <chan> +<modes>" */
 251                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s", Channel_Name( chan ), modes )) return DISCONNECTED;
 252                                         }
 253                                         else if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )))
 254                                         {
 255                                                 /* "CHANINFO <chan> +<modes> :<topic>" */
 256                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s :%s", Channel_Name( chan ), modes, topic )) return DISCONNECTED;
 257                                         }
 258                                         else
 259                                         {
 260                                                 /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 261                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s %s %lu :%s",
 262                                                         Channel_Name( chan ), modes,
 263                                                         strchr( Channel_Modes( chan ), 'k' ) ? Channel_Key( chan ) : "*",
 264                                                         strchr( Channel_Modes( chan ), 'l' ) ? Channel_MaxUsers( chan ) : 0UL, topic ))
 265                                                 {
 266                                                         return DISCONNECTED;
 267                                                 }
 268                                         }
 269                                 }
 270                         }
 271 #endif
 272
 273                         /* alle Member suchen */
 274                         cl2chan = Channel_FirstMember( chan );
 275                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 276                         while( cl2chan )
 277                         {
 278                                 cl = Channel_GetClient( cl2chan );
 279                                 assert( cl != NULL );
 280
 281                                 /* Nick, ggf. mit Modes, anhaengen */
 282                                 if( str[strlen( str ) - 1] != ':' ) strlcat( str, ",", sizeof( str ));
 283                                 if( strchr( Channel_UserModes( chan, cl ), 'v' )) strlcat( str, "+", sizeof( str ));
 284                                 if( strchr( Channel_UserModes( chan, cl ), 'o' )) strlcat( str, "@", sizeof( str ));
 285                                 strlcat( str, Client_ID( cl ), sizeof( str ));
 286
 287                                 if( strlen( str ) > ( LINE_LEN - CLIENT_NICK_LEN - 8 ))
 288                                 {
 289                                         /* Zeile senden */
 290                                         if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 291                                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 292                                 }
 293
 294                                 cl2chan = Channel_NextMember( chan, cl2chan );
 295                         }
 296
 297                         /* noch Daten da? */
 298                         if( str[strlen( str ) - 1] != ':')
 299                         {
 300                                 /* Ja; Also senden ... */
 301                                 if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 302                         }
 303
 304                         /* Get next channel ... */
 305                         chan = Channel_Next(chan);
 306                 }
 307
 308 #ifdef IRCPLUS
 309                 if (strchr(Client_Flags(Client), 'L')) {
 310 #ifdef DEBUG
 311                         Log(LOG_DEBUG,
 312                             "Synchronizing INVITE- and BAN-lists ...");
 313 #endif
 314                         /* Synchronize INVITE- and BAN-lists */
 315                         if (!Synchronize_Lists(Client))
 316                                 return DISCONNECTED;
 317                 }
 318 #endif
 319
 320                 return CONNECTED;
 321         }
 322         else if( Client_Type( Client ) == CLIENT_SERVER )
 323         {
 324                 /* Neuer Server wird im Netz angekuendigt */
 325
 326                 /* Falsche Anzahl Parameter? */
 327                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 328
 329                 /* Ist ein Server mit dieser ID bereits registriert? */
 330                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 331
 332                 /* Ueberfluessige Hostnamen aus Info-Text entfernen */
 333                 ptr = strchr( Req->argv[3] + 2, '[' );
 334                 if( ! ptr ) ptr = Req->argv[3];
 335
 336                 from = Client_Search( Req->prefix );
 337                 if( ! from )
 338                 {
 339                         /* Hm, Server, der diesen einfuehrt, ist nicht bekannt!? */
 340                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 341                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 342                         return DISCONNECTED;
 343                 }
 344
 345                 /* Neue Client-Struktur anlegen */
 346                 c = Client_NewRemoteServer( Client, Req->argv[0], from, atoi( Req->argv[1] ), atoi( Req->argv[2] ), ptr, true);
 347                 if( ! c )
 348                 {
 349                         /* Neue Client-Struktur konnte nicht angelegt werden */
 350                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 351                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 352                         return DISCONNECTED;
 353                 }
 354
 355                 /* Log-Meldung zusammenbauen und ausgeben */
 356                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 357                 else strcpy( str, "" );
 358                 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": "" );
 359
 360                 /* Andere Server informieren */
 361                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 362
 363                 return CONNECTED;
 364         }
 365         else return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 366 } /* IRC_SERVER */
 367
 368
 369 GLOBAL bool
 370 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 371 {
 372         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 373         bool is_op, is_voiced;
 374         CHANNEL *chan;
 375         CLIENT *c;
 376
 377         assert( Client != NULL );
 378         assert( Req != NULL );
 379
 380         /* Falsche Anzahl Parameter? */
 381         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 382
 383         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 384         strcpy( nick_out, "" );
 385
 386         channame = Req->argv[0];
 387         ptr = strtok( nick_in, "," );
 388         while( ptr )
 389         {
 390                 is_op = is_voiced = false;
 391
 392                 /* Prefixe abschneiden */
 393                 while(( *ptr == '@' ) || ( *ptr == '+' ))
 394                 {
 395                         if( *ptr == '@' ) is_op = true;
 396                         if( *ptr == '+' ) is_voiced = true;
 397                         ptr++;
 398                 }
 399
 400                 c = Client_Search( ptr );
 401                 if( c )
 402                 {
 403                         Channel_Join( c, channame );
 404                         chan = Channel_Search( channame );
 405                         assert( chan != NULL );
 406
 407                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 408                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 409
 410                         /* im Channel bekannt machen */
 411                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 412
 413                         /* Channel-User-Modes setzen */
 414                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 415                         if( modes[0] )
 416                         {
 417                                 /* Modes im Channel bekannt machen */
 418                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 419                         }
 420
 421                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 422                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 423                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 424                         strlcat( nick_out, ptr, sizeof( nick_out ));
 425                 }
 426                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 427
 428                 /* naechsten Nick suchen */
 429                 ptr = strtok( NULL, "," );
 430         }
 431
 432         /* an andere Server weiterleiten */
 433         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 434
 435         return CONNECTED;
 436 } /* IRC_NJOIN */
 437
 438
 439 GLOBAL bool
 440 IRC_SQUIT( CLIENT *Client, REQUEST *Req )
 441 {
 442         CLIENT *target;
 443         char msg[LINE_LEN + 64];
 444
 445         assert( Client != NULL );
 446         assert( Req != NULL );
 447
 448         /* Falsche Anzahl Parameter? */
 449         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 450
 451         Log( LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...", Client_ID( Client ), Req->argv[0], Req->argv[1] );
 452
 453         target = Client_Search( Req->argv[0] );
 454         if( ! target )
 455         {
 456                 /* Den Server kennen wir nicht (mehr), also nichts zu tun. */
 457                 Log( LOG_WARNING, "Got SQUIT from %s for unknown server \"%s\"!?", Client_ID( Client ), Req->argv[0] );
 458                 return CONNECTED;
 459         }
 460
 461         if( Req->argv[1][0] )
 462         {
 463                 if( strlen( Req->argv[1] ) > LINE_LEN ) Req->argv[1][LINE_LEN] = '\0';
 464                 snprintf( msg, sizeof( msg ), "%s (SQUIT from %s).", Req->argv[1], Client_ID( Client ));
 465         }
 466         else snprintf( msg, sizeof( msg ), "Got SQUIT from %s.", Client_ID( Client ));
 467
 468         if( Client_Conn( target ) > NONE )
 469         {
 470                 /* dieser Server hat die Connection */
 471                 if( Req->argv[1][0] ) Conn_Close( Client_Conn( target ), msg, Req->argv[1], true);
 472                 else Conn_Close( Client_Conn( target ), msg, NULL, true);
 473                 return DISCONNECTED;
 474         }
 475         else
 476         {
 477                 /* Verbindung hielt anderer Server */
 478                 Client_Destroy( target, msg, Req->argv[1], false );
 479                 return CONNECTED;
 480         }
 481 } /* IRC_SQUIT */
 482
 483
 484 /* -eof- */