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 1.42 2006/12/02 14:10:48 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 /**
  45  * Handler for the IRC command "SERVER".
  46  * See RFC 2813 section 4.1.2.
  47  */
  48 GLOBAL bool
  49 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  50 {
  51         char str[LINE_LEN], *ptr, *modes, *topic;
  52         CLIENT *from, *c, *cl;
  53         CL2CHAN *cl2chan;
  54         int max_hops, i;
  55         CHANNEL *chan;
  56         bool ok;
  57         CONN_ID con;
  58
  59         assert( Client != NULL );
  60         assert( Req != NULL );
  61
  62         /* Return an error if this is not a local client */
  63         if (Client_Conn(Client) <= NONE)
  64                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  65                                           Client_ID(Client), Req->command);
  66
  67         if (Client_Type(Client) == CLIENT_GOTPASS) {
  68                 /* We got a PASS command from the peer, and now a SERVER
  69                  * command: the peer tries to register itself as a server. */
  70                 LogDebug("Connection %d: got SERVER command (new server link) ...",
  71                         Client_Conn(Client));
  72
  73                 /* Falsche Anzahl Parameter? */
  74                 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
  75
  76                 /* Ist dieser Server bei uns konfiguriert? */
  77                 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
  78                 if( i >= MAX_SERVERS )
  79                 {
  80                         /* Server ist nicht konfiguriert! */
  81                         Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
  82                         Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
  83                         return DISCONNECTED;
  84                 }
  85                 if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
  86                 {
  87                         /* Falsches Passwort */
  88                         Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
  89                         Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
  90                         return DISCONNECTED;
  91                 }
  92
  93                 /* Ist ein Server mit dieser ID bereits registriert? */
  94                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
  95
  96                 /* Server-Strukturen fuellen ;-) */
  97                 Client_SetID( Client, Req->argv[0] );
  98                 Client_SetHops( Client, 1 );
  99                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 100
 101                 /* Meldet sich der Server bei uns an (d.h., bauen nicht wir
 102                  * selber die Verbindung zu einem anderen Server auf)? */
 103                 con = Client_Conn( Client );
 104                 if( Client_Token( Client ) != TOKEN_OUTBOUND )
 105                 {
 106                         /* Eingehende Verbindung: Unseren SERVER- und PASS-Befehl senden */
 107                         ok = true;
 108                         if( ! IRC_WriteStrClient( Client, "PASS %s %s", Conf_Server[i].pwd_out, NGIRCd_ProtoID )) ok = false;
 109                         else ok = IRC_WriteStrClient( Client, "SERVER %s 1 :%s", Conf_ServerName, Conf_ServerInfo );
 110                         if( ! ok )
 111                         {
 112                                 Conn_Close( con, "Unexpected server behavior!", NULL, false );
 113                                 return DISCONNECTED;
 114                         }
 115                         Client_SetIntroducer( Client, Client );
 116                         Client_SetToken( Client, 1 );
 117                 }
 118                 else
 119                 {
 120                         /* Ausgehende verbindung, SERVER und PASS wurden von uns bereits
 121                          * an die Gegenseite uerbermittelt */
 122                         Client_SetToken( Client, atoi( Req->argv[1] ));
 123                 }
 124
 125                 Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (connection %d, 1 hop - direct link).", Client_ID( Client ), con );
 126
 127                 Client_SetType( Client, CLIENT_SERVER );
 128                 Conf_SetServer( i, con );
 129
 130 #ifdef ZLIB
 131                 /* Kompression initialisieren, wenn erforderlich */
 132                 if( strchr( Client_Flags( Client ), 'Z' ))
 133                 {
 134                         if( ! Zip_InitConn( con ))
 135                         {
 136                                 /* Fehler! */
 137                                 Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
 138                                 return DISCONNECTED;
 139                         }
 140                 }
 141 #endif
 142
 143                 /* maximalen Hop Count ermitteln */
 144                 max_hops = 0;
 145                 c = Client_First( );
 146                 while( c )
 147                 {
 148                         if( Client_Hops( c ) > max_hops ) max_hops = Client_Hops( c );
 149                         c = Client_Next( c );
 150                 }
 151
 152                 /* Alle bisherigen Server dem neuen Server bekannt machen,
 153                  * die bisherigen Server ueber den neuen informierenn */
 154                 for( i = 0; i < ( max_hops + 1 ); i++ )
 155                 {
 156                         c = Client_First( );
 157                         while( c )
 158                         {
 159                                 if(( Client_Type( c ) == CLIENT_SERVER ) && ( c != Client ) && ( c != Client_ThisServer( )) && ( Client_Hops( c ) == i ))
 160                                 {
 161                                         if( Client_Conn( c ) > NONE )
 162                                         {
 163                                                 /* Dem gefundenen Server gleich den neuen
 164                                                  * Server bekannt machen */
 165                                                 if( ! IRC_WriteStrClient( c, "SERVER %s %d %d :%s", Client_ID( Client ), Client_Hops( Client ) + 1, Client_MyToken( Client ), Client_Info( Client ))) return DISCONNECTED;
 166                                         }
 167
 168                                         /* Den neuen Server ueber den alten informieren */
 169                                         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;
 170                                 }
 171                                 c = Client_Next( c );
 172                         }
 173                 }
 174
 175                 /* alle User dem neuen Server bekannt machen */
 176                 c = Client_First( );
 177                 while( c )
 178                 {
 179                         if( Client_Type( c ) == CLIENT_USER )
 180                         {
 181                                 /* User an neuen Server melden */
 182                                 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;
 183                         }
 184                         c = Client_Next( c );
 185                 }
 186
 187                 /* Channels dem neuen Server bekannt machen */
 188                 chan = Channel_First( );
 189                 while( chan )
 190                 {
 191 #ifdef IRCPLUS
 192                         /* Send CHANINFO if the peer supports it */
 193                         if( strchr( Client_Flags( Client ), 'C' ))
 194                         {
 195 #ifdef DEBUG
 196                                 Log( LOG_DEBUG, "Sending CHANINFO commands ..." );
 197 #endif
 198                                 modes = Channel_Modes( chan );
 199                                 topic = Channel_Topic( chan );
 200
 201                                 if( *modes || *topic )
 202                                 {
 203                                         /* send CHANINFO */
 204                                         if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )) && ( ! *topic ))
 205                                         {
 206                                                 /* "CHANINFO <chan> +<modes>" */
 207                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s", Channel_Name( chan ), modes )) return DISCONNECTED;
 208                                         }
 209                                         else if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )))
 210                                         {
 211                                                 /* "CHANINFO <chan> +<modes> :<topic>" */
 212                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s :%s", Channel_Name( chan ), modes, topic )) return DISCONNECTED;
 213                                         }
 214                                         else
 215                                         {
 216                                                 /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 217                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s %s %lu :%s",
 218                                                         Channel_Name( chan ), modes,
 219                                                         strchr( Channel_Modes( chan ), 'k' ) ? Channel_Key( chan ) : "*",
 220                                                         strchr( Channel_Modes( chan ), 'l' ) ? Channel_MaxUsers( chan ) : 0UL, topic ))
 221                                                 {
 222                                                         return DISCONNECTED;
 223                                                 }
 224                                         }
 225                                 }
 226                         }
 227 #endif
 228
 229                         /* alle Member suchen */
 230                         cl2chan = Channel_FirstMember( chan );
 231                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 232                         while( cl2chan )
 233                         {
 234                                 cl = Channel_GetClient( cl2chan );
 235                                 assert( cl != NULL );
 236
 237                                 /* Nick, ggf. mit Modes, anhaengen */
 238                                 if( str[strlen( str ) - 1] != ':' ) strlcat( str, ",", sizeof( str ));
 239                                 if( strchr( Channel_UserModes( chan, cl ), 'v' )) strlcat( str, "+", sizeof( str ));
 240                                 if( strchr( Channel_UserModes( chan, cl ), 'o' )) strlcat( str, "@", sizeof( str ));
 241                                 strlcat( str, Client_ID( cl ), sizeof( str ));
 242
 243                                 if( strlen( str ) > ( LINE_LEN - CLIENT_NICK_LEN - 8 ))
 244                                 {
 245                                         /* Zeile senden */
 246                                         if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 247                                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 248                                 }
 249
 250                                 cl2chan = Channel_NextMember( chan, cl2chan );
 251                         }
 252
 253                         /* noch Daten da? */
 254                         if( str[strlen( str ) - 1] != ':')
 255                         {
 256                                 /* Ja; Also senden ... */
 257                                 if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 258                         }
 259
 260                         /* Get next channel ... */
 261                         chan = Channel_Next(chan);
 262                 }
 263
 264 #ifdef IRCPLUS
 265                 if (strchr(Client_Flags(Client), 'L')) {
 266 #ifdef DEBUG
 267                         Log(LOG_DEBUG,
 268                             "Synchronizing INVITE- and BAN-lists ...");
 269 #endif
 270                         /* Synchronize INVITE- and BAN-lists */
 271                         if (! Lists_SendInvites(Client))
 272                                 return DISCONNECTED;
 273                         if (! Lists_SendBans(Client))
 274                                 return DISCONNECTED;
 275                 }
 276 #endif
 277
 278                 return CONNECTED;
 279         }
 280         else if( Client_Type( Client ) == CLIENT_SERVER )
 281         {
 282                 /* Neuer Server wird im Netz angekuendigt */
 283
 284                 /* Falsche Anzahl Parameter? */
 285                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 286
 287                 /* Ist ein Server mit dieser ID bereits registriert? */
 288                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 289
 290                 /* Ueberfluessige Hostnamen aus Info-Text entfernen */
 291                 ptr = strchr( Req->argv[3] + 2, '[' );
 292                 if( ! ptr ) ptr = Req->argv[3];
 293
 294                 from = Client_Search( Req->prefix );
 295                 if( ! from )
 296                 {
 297                         /* Hm, Server, der diesen einfuehrt, ist nicht bekannt!? */
 298                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 299                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 300                         return DISCONNECTED;
 301                 }
 302
 303                 /* Neue Client-Struktur anlegen */
 304                 c = Client_NewRemoteServer( Client, Req->argv[0], from, atoi( Req->argv[1] ), atoi( Req->argv[2] ), ptr, true);
 305                 if( ! c )
 306                 {
 307                         /* Neue Client-Struktur konnte nicht angelegt werden */
 308                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 309                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 310                         return DISCONNECTED;
 311                 }
 312
 313                 /* Log-Meldung zusammenbauen und ausgeben */
 314                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 315                 else strcpy( str, "" );
 316                 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": "" );
 317
 318                 /* Andere Server informieren */
 319                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 320
 321                 return CONNECTED;
 322         }
 323         else return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 324 } /* IRC_SERVER */
 325
 326
 327 GLOBAL bool
 328 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 329 {
 330         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 331         bool is_op, is_voiced;
 332         CHANNEL *chan;
 333         CLIENT *c;
 334
 335         assert( Client != NULL );
 336         assert( Req != NULL );
 337
 338         /* Falsche Anzahl Parameter? */
 339         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 340
 341         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 342         strcpy( nick_out, "" );
 343
 344         channame = Req->argv[0];
 345         ptr = strtok( nick_in, "," );
 346         while( ptr )
 347         {
 348                 is_op = is_voiced = false;
 349
 350                 /* Prefixe abschneiden */
 351                 while(( *ptr == '@' ) || ( *ptr == '+' ))
 352                 {
 353                         if( *ptr == '@' ) is_op = true;
 354                         if( *ptr == '+' ) is_voiced = true;
 355                         ptr++;
 356                 }
 357
 358                 c = Client_Search( ptr );
 359                 if( c )
 360                 {
 361                         Channel_Join( c, channame );
 362                         chan = Channel_Search( channame );
 363                         assert( chan != NULL );
 364
 365                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 366                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 367
 368                         /* im Channel bekannt machen */
 369                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 370
 371                         /* Channel-User-Modes setzen */
 372                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 373                         if( modes[0] )
 374                         {
 375                                 /* Modes im Channel bekannt machen */
 376                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 377                         }
 378
 379                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 380                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 381                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 382                         strlcat( nick_out, ptr, sizeof( nick_out ));
 383                 }
 384                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 385
 386                 /* naechsten Nick suchen */
 387                 ptr = strtok( NULL, "," );
 388         }
 389
 390         /* an andere Server weiterleiten */
 391         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 392
 393         return CONNECTED;
 394 } /* IRC_NJOIN */
 395
 396
 397 GLOBAL bool
 398 IRC_SQUIT( CLIENT *Client, REQUEST *Req )
 399 {
 400         CLIENT *target;
 401         char msg[LINE_LEN + 64];
 402
 403         assert( Client != NULL );
 404         assert( Req != NULL );
 405
 406         /* Falsche Anzahl Parameter? */
 407         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 408
 409         Log( LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...", Client_ID( Client ), Req->argv[0], Req->argv[1] );
 410
 411         target = Client_Search( Req->argv[0] );
 412         if( ! target )
 413         {
 414                 /* Den Server kennen wir nicht (mehr), also nichts zu tun. */
 415                 Log( LOG_WARNING, "Got SQUIT from %s for unknown server \"%s\"!?", Client_ID( Client ), Req->argv[0] );
 416                 return CONNECTED;
 417         }
 418
 419         if( Req->argv[1][0] )
 420         {
 421                 if( strlen( Req->argv[1] ) > LINE_LEN ) Req->argv[1][LINE_LEN] = '\0';
 422                 snprintf( msg, sizeof( msg ), "%s (SQUIT from %s).", Req->argv[1], Client_ID( Client ));
 423         }
 424         else snprintf( msg, sizeof( msg ), "Got SQUIT from %s.", Client_ID( Client ));
 425
 426         if( Client_Conn( target ) > NONE )
 427         {
 428                 /* dieser Server hat die Connection */
 429                 if( Req->argv[1][0] ) Conn_Close( Client_Conn( target ), msg, Req->argv[1], true);
 430                 else Conn_Close( Client_Conn( target ), msg, NULL, true);
 431                 return DISCONNECTED;
 432         }
 433         else
 434         {
 435                 /* Verbindung hielt anderer Server */
 436                 Client_Destroy( target, msg, Req->argv[1], false );
 437                 return CONNECTED;
 438         }
 439 } /* IRC_SQUIT */
 440
 441
 442 /* -eof- */