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 1.41 2006/10/06 21:32:58 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                 Log(LOG_DEBUG,
  71                     "Connection %d: got SERVER command (new server link) ...",
  72                     Client_Conn(Client));
  73
  74                 /* Falsche Anzahl Parameter? */
  75                 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
  76
  77                 /* Ist dieser Server bei uns konfiguriert? */
  78                 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
  79                 if( i >= MAX_SERVERS )
  80                 {
  81                         /* Server ist nicht konfiguriert! */
  82                         Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
  83                         Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
  84                         return DISCONNECTED;
  85                 }
  86                 if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
  87                 {
  88                         /* Falsches Passwort */
  89                         Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
  90                         Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
  91                         return DISCONNECTED;
  92                 }
  93
  94                 /* Ist ein Server mit dieser ID bereits registriert? */
  95                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
  96
  97                 /* Server-Strukturen fuellen ;-) */
  98                 Client_SetID( Client, Req->argv[0] );
  99                 Client_SetHops( Client, 1 );
 100                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 101
 102                 /* Meldet sich der Server bei uns an (d.h., bauen nicht wir
 103                  * selber die Verbindung zu einem anderen Server auf)? */
 104                 con = Client_Conn( Client );
 105                 if( Client_Token( Client ) != TOKEN_OUTBOUND )
 106                 {
 107                         /* Eingehende Verbindung: Unseren SERVER- und PASS-Befehl senden */
 108                         ok = true;
 109                         if( ! IRC_WriteStrClient( Client, "PASS %s %s", Conf_Server[i].pwd_out, NGIRCd_ProtoID )) ok = false;
 110                         else ok = IRC_WriteStrClient( Client, "SERVER %s 1 :%s", Conf_ServerName, Conf_ServerInfo );
 111                         if( ! ok )
 112                         {
 113                                 Conn_Close( con, "Unexpected server behavior!", NULL, false );
 114                                 return DISCONNECTED;
 115                         }
 116                         Client_SetIntroducer( Client, Client );
 117                         Client_SetToken( Client, 1 );
 118                 }
 119                 else
 120                 {
 121                         /* Ausgehende verbindung, SERVER und PASS wurden von uns bereits
 122                          * an die Gegenseite uerbermittelt */
 123                         Client_SetToken( Client, atoi( Req->argv[1] ));
 124                 }
 125
 126                 Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (connection %d, 1 hop - direct link).", Client_ID( Client ), con );
 127
 128                 Client_SetType( Client, CLIENT_SERVER );
 129                 Conf_SetServer( i, con );
 130
 131 #ifdef ZLIB
 132                 /* Kompression initialisieren, wenn erforderlich */
 133                 if( strchr( Client_Flags( Client ), 'Z' ))
 134                 {
 135                         if( ! Zip_InitConn( con ))
 136                         {
 137                                 /* Fehler! */
 138                                 Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
 139                                 return DISCONNECTED;
 140                         }
 141                 }
 142 #endif
 143
 144                 /* maximalen Hop Count ermitteln */
 145                 max_hops = 0;
 146                 c = Client_First( );
 147                 while( c )
 148                 {
 149                         if( Client_Hops( c ) > max_hops ) max_hops = Client_Hops( c );
 150                         c = Client_Next( c );
 151                 }
 152
 153                 /* Alle bisherigen Server dem neuen Server bekannt machen,
 154                  * die bisherigen Server ueber den neuen informierenn */
 155                 for( i = 0; i < ( max_hops + 1 ); i++ )
 156                 {
 157                         c = Client_First( );
 158                         while( c )
 159                         {
 160                                 if(( Client_Type( c ) == CLIENT_SERVER ) && ( c != Client ) && ( c != Client_ThisServer( )) && ( Client_Hops( c ) == i ))
 161                                 {
 162                                         if( Client_Conn( c ) > NONE )
 163                                         {
 164                                                 /* Dem gefundenen Server gleich den neuen
 165                                                  * Server bekannt machen */
 166                                                 if( ! IRC_WriteStrClient( c, "SERVER %s %d %d :%s", Client_ID( Client ), Client_Hops( Client ) + 1, Client_MyToken( Client ), Client_Info( Client ))) return DISCONNECTED;
 167                                         }
 168
 169                                         /* Den neuen Server ueber den alten informieren */
 170                                         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;
 171                                 }
 172                                 c = Client_Next( c );
 173                         }
 174                 }
 175
 176                 /* alle User dem neuen Server bekannt machen */
 177                 c = Client_First( );
 178                 while( c )
 179                 {
 180                         if( Client_Type( c ) == CLIENT_USER )
 181                         {
 182                                 /* User an neuen Server melden */
 183                                 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;
 184                         }
 185                         c = Client_Next( c );
 186                 }
 187
 188                 /* Channels dem neuen Server bekannt machen */
 189                 chan = Channel_First( );
 190                 while( chan )
 191                 {
 192 #ifdef IRCPLUS
 193                         /* Send CHANINFO if the peer supports it */
 194                         if( strchr( Client_Flags( Client ), 'C' ))
 195                         {
 196 #ifdef DEBUG
 197                                 Log( LOG_DEBUG, "Sending CHANINFO commands ..." );
 198 #endif
 199                                 modes = Channel_Modes( chan );
 200                                 topic = Channel_Topic( chan );
 201
 202                                 if( *modes || *topic )
 203                                 {
 204                                         /* send CHANINFO */
 205                                         if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )) && ( ! *topic ))
 206                                         {
 207                                                 /* "CHANINFO <chan> +<modes>" */
 208                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s", Channel_Name( chan ), modes )) return DISCONNECTED;
 209                                         }
 210                                         else if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )))
 211                                         {
 212                                                 /* "CHANINFO <chan> +<modes> :<topic>" */
 213                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s :%s", Channel_Name( chan ), modes, topic )) return DISCONNECTED;
 214                                         }
 215                                         else
 216                                         {
 217                                                 /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 218                                                 if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s %s %lu :%s",
 219                                                         Channel_Name( chan ), modes,
 220                                                         strchr( Channel_Modes( chan ), 'k' ) ? Channel_Key( chan ) : "*",
 221                                                         strchr( Channel_Modes( chan ), 'l' ) ? Channel_MaxUsers( chan ) : 0UL, topic ))
 222                                                 {
 223                                                         return DISCONNECTED;
 224                                                 }
 225                                         }
 226                                 }
 227                         }
 228 #endif
 229
 230                         /* alle Member suchen */
 231                         cl2chan = Channel_FirstMember( chan );
 232                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 233                         while( cl2chan )
 234                         {
 235                                 cl = Channel_GetClient( cl2chan );
 236                                 assert( cl != NULL );
 237
 238                                 /* Nick, ggf. mit Modes, anhaengen */
 239                                 if( str[strlen( str ) - 1] != ':' ) strlcat( str, ",", sizeof( str ));
 240                                 if( strchr( Channel_UserModes( chan, cl ), 'v' )) strlcat( str, "+", sizeof( str ));
 241                                 if( strchr( Channel_UserModes( chan, cl ), 'o' )) strlcat( str, "@", sizeof( str ));
 242                                 strlcat( str, Client_ID( cl ), sizeof( str ));
 243
 244                                 if( strlen( str ) > ( LINE_LEN - CLIENT_NICK_LEN - 8 ))
 245                                 {
 246                                         /* Zeile senden */
 247                                         if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 248                                         snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
 249                                 }
 250
 251                                 cl2chan = Channel_NextMember( chan, cl2chan );
 252                         }
 253
 254                         /* noch Daten da? */
 255                         if( str[strlen( str ) - 1] != ':')
 256                         {
 257                                 /* Ja; Also senden ... */
 258                                 if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
 259                         }
 260
 261                         /* Get next channel ... */
 262                         chan = Channel_Next(chan);
 263                 }
 264
 265 #ifdef IRCPLUS
 266                 if (strchr(Client_Flags(Client), 'L')) {
 267 #ifdef DEBUG
 268                         Log(LOG_DEBUG,
 269                             "Synchronizing INVITE- and BAN-lists ...");
 270 #endif
 271                         /* Synchronize INVITE- and BAN-lists */
 272                         if (! Lists_SendInvites(Client))
 273                                 return DISCONNECTED;
 274                         if (! Lists_SendBans(Client))
 275                                 return DISCONNECTED;
 276                 }
 277 #endif
 278
 279                 return CONNECTED;
 280         }
 281         else if( Client_Type( Client ) == CLIENT_SERVER )
 282         {
 283                 /* Neuer Server wird im Netz angekuendigt */
 284
 285                 /* Falsche Anzahl Parameter? */
 286                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 287
 288                 /* Ist ein Server mit dieser ID bereits registriert? */
 289                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 290
 291                 /* Ueberfluessige Hostnamen aus Info-Text entfernen */
 292                 ptr = strchr( Req->argv[3] + 2, '[' );
 293                 if( ! ptr ) ptr = Req->argv[3];
 294
 295                 from = Client_Search( Req->prefix );
 296                 if( ! from )
 297                 {
 298                         /* Hm, Server, der diesen einfuehrt, ist nicht bekannt!? */
 299                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 300                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 301                         return DISCONNECTED;
 302                 }
 303
 304                 /* Neue Client-Struktur anlegen */
 305                 c = Client_NewRemoteServer( Client, Req->argv[0], from, atoi( Req->argv[1] ), atoi( Req->argv[2] ), ptr, true);
 306                 if( ! c )
 307                 {
 308                         /* Neue Client-Struktur konnte nicht angelegt werden */
 309                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 310                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 311                         return DISCONNECTED;
 312                 }
 313
 314                 /* Log-Meldung zusammenbauen und ausgeben */
 315                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 316                 else strcpy( str, "" );
 317                 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": "" );
 318
 319                 /* Andere Server informieren */
 320                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 321
 322                 return CONNECTED;
 323         }
 324         else return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 325 } /* IRC_SERVER */
 326
 327
 328 GLOBAL bool
 329 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 330 {
 331         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 332         bool is_op, is_voiced;
 333         CHANNEL *chan;
 334         CLIENT *c;
 335
 336         assert( Client != NULL );
 337         assert( Req != NULL );
 338
 339         /* Falsche Anzahl Parameter? */
 340         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 341
 342         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 343         strcpy( nick_out, "" );
 344
 345         channame = Req->argv[0];
 346         ptr = strtok( nick_in, "," );
 347         while( ptr )
 348         {
 349                 is_op = is_voiced = false;
 350
 351                 /* Prefixe abschneiden */
 352                 while(( *ptr == '@' ) || ( *ptr == '+' ))
 353                 {
 354                         if( *ptr == '@' ) is_op = true;
 355                         if( *ptr == '+' ) is_voiced = true;
 356                         ptr++;
 357                 }
 358
 359                 c = Client_Search( ptr );
 360                 if( c )
 361                 {
 362                         Channel_Join( c, channame );
 363                         chan = Channel_Search( channame );
 364                         assert( chan != NULL );
 365
 366                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 367                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 368
 369                         /* im Channel bekannt machen */
 370                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 371
 372                         /* Channel-User-Modes setzen */
 373                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 374                         if( modes[0] )
 375                         {
 376                                 /* Modes im Channel bekannt machen */
 377                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 378                         }
 379
 380                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 381                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 382                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 383                         strlcat( nick_out, ptr, sizeof( nick_out ));
 384                 }
 385                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 386
 387                 /* naechsten Nick suchen */
 388                 ptr = strtok( NULL, "," );
 389         }
 390
 391         /* an andere Server weiterleiten */
 392         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 393
 394         return CONNECTED;
 395 } /* IRC_NJOIN */
 396
 397
 398 GLOBAL bool
 399 IRC_SQUIT( CLIENT *Client, REQUEST *Req )
 400 {
 401         CLIENT *target;
 402         char msg[LINE_LEN + 64];
 403
 404         assert( Client != NULL );
 405         assert( Req != NULL );
 406
 407         /* Falsche Anzahl Parameter? */
 408         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 409
 410         Log( LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...", Client_ID( Client ), Req->argv[0], Req->argv[1] );
 411
 412         target = Client_Search( Req->argv[0] );
 413         if( ! target )
 414         {
 415                 /* Den Server kennen wir nicht (mehr), also nichts zu tun. */
 416                 Log( LOG_WARNING, "Got SQUIT from %s for unknown server \"%s\"!?", Client_ID( Client ), Req->argv[0] );
 417                 return CONNECTED;
 418         }
 419
 420         if( Req->argv[1][0] )
 421         {
 422                 if( strlen( Req->argv[1] ) > LINE_LEN ) Req->argv[1][LINE_LEN] = '\0';
 423                 snprintf( msg, sizeof( msg ), "%s (SQUIT from %s).", Req->argv[1], Client_ID( Client ));
 424         }
 425         else snprintf( msg, sizeof( msg ), "Got SQUIT from %s.", Client_ID( Client ));
 426
 427         if( Client_Conn( target ) > NONE )
 428         {
 429                 /* dieser Server hat die Connection */
 430                 if( Req->argv[1][0] ) Conn_Close( Client_Conn( target ), msg, Req->argv[1], true);
 431                 else Conn_Close( Client_Conn( target ), msg, NULL, true);
 432                 return DISCONNECTED;
 433         }
 434         else
 435         {
 436                 /* Verbindung hielt anderer Server */
 437                 Client_Destroy( target, msg, Req->argv[1], false );
 438                 return CONNECTED;
 439         }
 440 } /* IRC_SQUIT */
 441
 442
 443 /* -eof- */