src/ngircd/irc-login.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2008 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  * Login and logout
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 #include "imp.h"
  18 #include <assert.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <strings.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 "log.h"
  31 #include "messages.h"
  32 #include "parse.h"
  33 #include "irc.h"
  34 #include "irc-info.h"
  35 #include "irc-write.h"
  36
  37 #include "exp.h"
  38 #include "irc-login.h"
  39
  40
  41 static bool Hello_User PARAMS(( CLIENT *Client ));
  42 static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
  43
  44
  45 /**
  46  * Handler for the IRC command "PASS".
  47  * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
  48  */
  49 GLOBAL bool
  50 IRC_PASS( CLIENT *Client, REQUEST *Req )
  51 {
  52         char *type, *orig_flags;
  53         int protohigh, protolow;
  54
  55         assert( Client != NULL );
  56         assert( Req != NULL );
  57
  58         /* Return an error if this is not a local client */
  59         if (Client_Conn(Client) <= NONE)
  60                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  61                                           Client_ID(Client), Req->command);
  62
  63         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  64                 /* Not yet registered "unknown" connection, PASS with one
  65                  * argument: either a regular client, service, or server
  66                  * using the old RFC 1459 section 4.1.1 syntax. */
  67                 LogDebug("Connection %d: got PASS command ...",
  68                          Client_Conn(Client));
  69         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  70                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  71                    (Req->argc == 3 || Req->argc == 4)) {
  72                 /* Not yet registered "unknown" connection or outgoing server
  73                  * link, PASS with three or four argument: server using the
  74                  * RFC 2813 section 4.1.1 syntax. */
  75                 LogDebug("Connection %d: got PASS command (new server link) ...",
  76                          Client_Conn(Client));
  77         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  78                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  79                 /* Unregistered connection, but wrong number of arguments: */
  80                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  81                                           Client_ID(Client), Req->command);
  82         } else {
  83                 /* Registered connection, PASS command is not allowed! */
  84                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
  85                                           Client_ID(Client));
  86         }
  87
  88         Client_SetPassword(Client, Req->argv[0]);
  89         Client_SetType(Client, CLIENT_GOTPASS);
  90
  91         /* Protocol version */
  92         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
  93                 int c2, c4;
  94
  95                 c2 = Req->argv[1][2];
  96                 c4 = Req->argv[1][4];
  97
  98                 Req->argv[1][4] = '\0';
  99                 protolow = atoi(&Req->argv[1][2]);
 100                 Req->argv[1][2] = '\0';
 101                 protohigh = atoi(Req->argv[1]);
 102
 103                 Req->argv[1][2] = c2;
 104                 Req->argv[1][4] = c4;
 105         } else
 106                 protohigh = protolow = 0;
 107
 108         /* Protocol type, see doc/Protocol.txt */
 109         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 110                 type = &Req->argv[1][4];
 111         else
 112                 type = NULL;
 113
 114         /* Protocol flags/options */
 115         if (Req->argc >= 4)
 116                 orig_flags = Req->argv[3];
 117         else
 118                 orig_flags = "";
 119
 120         /* Implementation, version and IRC+ flags */
 121         if (Req->argc >= 3) {
 122                 char *impl, *ptr, *serverver, *flags;
 123
 124                 impl = Req->argv[2];
 125                 ptr = strchr(impl, '|');
 126                 if (ptr)
 127                         *ptr = '\0';
 128
 129                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 130                         /* The peer seems to be a server which supports the
 131                          * IRC+ protocol (see doc/Protocol.txt). */
 132                         serverver = ptr + 1;
 133                         flags = strchr(serverver, ':');
 134                         if (flags) {
 135                                 *flags = '\0';
 136                                 flags++;
 137                         } else
 138                                 flags = "";
 139                         Log(LOG_INFO,
 140                             "Peer announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 141                             impl, serverver, protohigh, protolow, flags);
 142                 } else {
 143                         /* The peer seems to be a server supporting the
 144                          * "original" IRC protocol (RFC 2813). */
 145                         serverver = "";
 146                         if (strchr(orig_flags, 'Z'))
 147                                 flags = "Z";
 148                         else
 149                                 flags = "";
 150                         Log(LOG_INFO,
 151                             "Peer announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 152                             impl, protohigh, protolow, flags);
 153                 }
 154                 Client_SetFlags(Client, flags);
 155         }
 156
 157         return CONNECTED;
 158 } /* IRC_PASS */
 159
 160
 161 /**
 162  * IRC "NICK" command.
 163  * This function implements the IRC command "NICK" which is used to register
 164  * with the server, to change already registered nicknames and to introduce
 165  * new users which are connected to other servers.
 166  */
 167 GLOBAL bool
 168 IRC_NICK( CLIENT *Client, REQUEST *Req )
 169 {
 170         CLIENT *intr_c, *target, *c;
 171         char *nick, *user, *hostname, *modes, *info;
 172         int token, hops;
 173
 174         assert( Client != NULL );
 175         assert( Req != NULL );
 176
 177 #ifndef STRICT_RFC
 178         /* Some IRC clients, for example BitchX, send the NICK and USER
 179          * commands in the wrong order ... */
 180         if( Client_Type( Client ) == CLIENT_UNKNOWN
 181             || Client_Type( Client ) == CLIENT_GOTPASS
 182             || Client_Type( Client ) == CLIENT_GOTNICK
 183             || Client_Type( Client ) == CLIENT_GOTUSER
 184             || Client_Type( Client ) == CLIENT_USER
 185             || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
 186 #else
 187         if( Client_Type( Client ) == CLIENT_UNKNOWN
 188             || Client_Type( Client ) == CLIENT_GOTPASS
 189             || Client_Type( Client ) == CLIENT_GOTNICK
 190             || Client_Type( Client ) == CLIENT_USER
 191             || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
 192 #endif
 193         {
 194                 /* User registration or change of nickname */
 195
 196                 /* Wrong number of arguments? */
 197                 if( Req->argc != 1 )
 198                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 199                                                    Client_ID( Client ),
 200                                                    Req->command );
 201
 202                 /* Search "target" client */
 203                 if( Client_Type( Client ) == CLIENT_SERVER )
 204                 {
 205                         target = Client_Search( Req->prefix );
 206                         if( ! target )
 207                                 return IRC_WriteStrClient( Client,
 208                                                            ERR_NOSUCHNICK_MSG,
 209                                                            Client_ID( Client ),
 210                                                            Req->argv[0] );
 211                 }
 212                 else
 213                 {
 214                         /* Is this a restricted client? */
 215                         if( Client_HasMode( Client, 'r' ))
 216                                 return IRC_WriteStrClient( Client,
 217                                                            ERR_RESTRICTED_MSG,
 218                                                            Client_ID( Client ));
 219
 220                         target = Client;
 221                 }
 222
 223 #ifndef STRICT_RFC
 224                 /* If the clients tries to change to its own nickname we won't
 225                  * do anything. This is how the original ircd behaves and some
 226                  * clients (for example Snak) expect it to be like this.
 227                  * But I doubt that this is "really the right thing" ... */
 228                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 229                         return CONNECTED;
 230 #endif
 231
 232                 /* Check that the new nickname is available. Special case:
 233                  * the client only changes from/to upper to lower case. */
 234                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 235                 {
 236                         if( ! Client_CheckNick( target, Req->argv[0] ))
 237                                 return CONNECTED;
 238                 }
 239
 240                 if(( Client_Type( target ) != CLIENT_USER )
 241                    && ( Client_Type( target ) != CLIENT_SERVER ))
 242                 {
 243                         /* New client */
 244                         Log( LOG_DEBUG, "Connection %d: got valid NICK command ...",
 245                              Client_Conn( Client ));
 246
 247                         /* Register new nickname of this client */
 248                         Client_SetID( target, Req->argv[0] );
 249
 250                         /* If we received a valid USER command already then
 251                          * register the new client! */
 252                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 253                                 return Hello_User( Client );
 254                         else
 255                                 Client_SetType( Client, CLIENT_GOTNICK );
 256                 }
 257                 else
 258                 {
 259                         /* Nickname change */
 260                         if (Client_Conn(target) > NONE) {
 261                                 /* Local client */
 262                                 Log(LOG_INFO,
 263                                     "User \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 264                                     Client_Mask(target), Client_Conn(target),
 265                                     Client_ID(target), Req->argv[0]);
 266                                 Conn_UpdateIdle(Client_Conn(target));
 267                         }
 268                         else
 269                         {
 270                                 /* Remote client */
 271                                 Log( LOG_DEBUG,
 272                                      "User \"%s\" changed nick: \"%s\" -> \"%s\".",
 273                                      Client_Mask( target ), Client_ID( target ),
 274                                      Req->argv[0] );
 275                         }
 276
 277                         /* Inform all users and servers (which have to know)
 278                          * of this nickname change */
 279                         if( Client_Type( Client ) == CLIENT_USER )
 280                                 IRC_WriteStrClientPrefix( Client, Client,
 281                                                           "NICK :%s",
 282                                                           Req->argv[0] );
 283                         IRC_WriteStrServersPrefix( Client, target,
 284                                                    "NICK :%s", Req->argv[0] );
 285                         IRC_WriteStrRelatedPrefix( target, target, false,
 286                                                    "NICK :%s", Req->argv[0] );
 287
 288                         /* Register old nickname for WHOWAS queries */
 289                         Client_RegisterWhowas( target );
 290
 291                         /* Save new nickname */
 292                         Client_SetID( target, Req->argv[0] );
 293
 294                         IRC_SetPenalty( target, 2 );
 295                 }
 296
 297                 return CONNECTED;
 298         } else if(Client_Type(Client) == CLIENT_SERVER ||
 299                   Client_Type(Client) == CLIENT_SERVICE) {
 300                 /* Server or service introduces new client */
 301
 302                 /* Bad number of parameters? */
 303                 if (Req->argc != 2 && Req->argc != 7)
 304                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 305                                                   Client_ID(Client), Req->command);
 306
 307                 if (Req->argc >= 7) {
 308                         nick = Req->argv[0];
 309                         hops = atoi(Req->argv[1]);
 310                         user = Req->argv[2];
 311                         hostname = Req->argv[3];
 312                         token = atoi(Req->argv[4]);
 313                         modes = Req->argv[5] + 1;
 314                         info = Req->argv[6];
 315                 } else {
 316                         nick = Req->argv[0];
 317                         hops = 1;
 318                         user = Req->argv[0];
 319                         hostname = Client_ID(Client);
 320                         token = atoi(Req->argv[1]);
 321                         modes = "";
 322                         info = Req->argv[0];
 323                 }
 324
 325                 /* Nick ueberpruefen */
 326                 c = Client_Search(nick);
 327                 if(c) {
 328                         /* Der neue Nick ist auf diesem Server bereits registriert:
 329                          * sowohl der neue, als auch der alte Client muessen nun
 330                          * disconnectiert werden. */
 331                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 332                         Kill_Nick( Req->argv[0], "Nick collision" );
 333                         return CONNECTED;
 334                 }
 335
 336                 /* Server, zu dem der Client connectiert ist, suchen */
 337                 intr_c = Client_GetFromToken(Client, token);
 338                 if( ! intr_c )
 339                 {
 340                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 341                         Kill_Nick( Req->argv[0], "Unknown server" );
 342                         return CONNECTED;
 343                 }
 344
 345                 /* Neue Client-Struktur anlegen */
 346                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 347                                          token, modes, info, true);
 348                 if( ! c )
 349                 {
 350                         /* Eine neue Client-Struktur konnte nicht angelegt werden.
 351                          * Der Client muss disconnectiert werden, damit der Netz-
 352                          * status konsistent bleibt. */
 353                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 354                         Kill_Nick( Req->argv[0], "Server error" );
 355                         return CONNECTED;
 356                 }
 357
 358                 modes = Client_Modes( c );
 359                 if( *modes ) Log( LOG_DEBUG, "User \"%s\" (+%s) registered (via %s, on %s, %d hop%s).", Client_Mask( c ), modes, Client_ID( Client ), Client_ID( intr_c ), Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
 360                 else Log( LOG_DEBUG, "User \"%s\" registered (via %s, on %s, %d hop%s).", Client_Mask( c ), Client_ID( Client ), Client_ID( intr_c ), Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
 361
 362                 /* Andere Server, ausser dem Introducer, informieren */
 363                 IRC_WriteStrServersPrefix( Client, Client, "NICK %s %d %s %s %d %s :%s", Req->argv[0], atoi( Req->argv[1] ) + 1, Req->argv[2], Req->argv[3], Client_MyToken( intr_c ), Req->argv[5], Req->argv[6] );
 364
 365                 return CONNECTED;
 366         }
 367         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 368 } /* IRC_NICK */
 369
 370
 371 GLOBAL bool
 372 IRC_USER( CLIENT *Client, REQUEST *Req )
 373 {
 374 #ifdef IDENTAUTH
 375         char *ptr;
 376 #endif
 377
 378         assert( Client != NULL );
 379         assert( Req != NULL );
 380
 381 #ifndef STRICT_RFC
 382         if( Client_Type( Client ) == CLIENT_GOTNICK || Client_Type( Client ) == CLIENT_GOTPASS || Client_Type( Client ) == CLIENT_UNKNOWN )
 383 #else
 384         if( Client_Type( Client ) == CLIENT_GOTNICK || Client_Type( Client ) == CLIENT_GOTPASS )
 385 #endif
 386         {
 387                 /* Wrong number of parameters? */
 388                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 389
 390                 /* User name */
 391 #ifdef IDENTAUTH
 392                 ptr = Client_User( Client );
 393                 if( ! ptr || ! *ptr || *ptr == '~' ) Client_SetUser( Client, Req->argv[0], false );
 394 #else
 395                 Client_SetUser( Client, Req->argv[0], false );
 396 #endif
 397
 398                 /* "Real name" or user info text: Don't set it to the empty string, the original ircd
 399                  * can't deal with such "real names" (e. g. "USER user * * :") ... */
 400                 if( *Req->argv[3] ) Client_SetInfo( Client, Req->argv[3] );
 401                 else Client_SetInfo( Client, "-" );
 402
 403                 Log( LOG_DEBUG, "Connection %d: got valid USER command ...", Client_Conn( Client ));
 404                 if( Client_Type( Client ) == CLIENT_GOTNICK ) return Hello_User( Client );
 405                 else Client_SetType( Client, CLIENT_GOTUSER );
 406                 return CONNECTED;
 407         }
 408         else if( Client_Type( Client ) == CLIENT_USER || Client_Type( Client ) == CLIENT_SERVER || Client_Type( Client ) == CLIENT_SERVICE )
 409         {
 410                 return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 411         }
 412         else return IRC_WriteStrClient( Client, ERR_NOTREGISTERED_MSG, Client_ID( Client ));
 413 } /* IRC_USER */
 414
 415
 416 /**
 417  * Service registration.
 418  * ngIRCd does not support services at the moment, so this function is a
 419  * dummy that returns ERR_ERRONEUSNICKNAME on each call.
 420  */
 421 GLOBAL bool
 422 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 423 {
 424         assert(Client != NULL);
 425         assert(Req != NULL);
 426
 427         if (Client_Type(Client) != CLIENT_GOTPASS)
 428                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 429                                           Client_ID(Client));
 430
 431         if (Req->argc != 6)
 432                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 433                                           Client_ID(Client), Req->command);
 434
 435         return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 436                                   Client_ID(Client), Req->argv[0]);
 437 } /* IRC_SERVICE */
 438
 439
 440 GLOBAL bool
 441 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 442 {
 443         CLIENT *target;
 444         char quitmsg[LINE_LEN];
 445
 446         assert( Client != NULL );
 447         assert( Req != NULL );
 448
 449         /* Wrong number of arguments? */
 450         if( Req->argc > 1 )
 451                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 452
 453         if (Req->argc == 1)
 454                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 455
 456         if ( Client_Type( Client ) == CLIENT_SERVER )
 457         {
 458                 /* Server */
 459                 target = Client_Search( Req->prefix );
 460                 if( ! target )
 461                 {
 462                         /* Den Client kennen wir nicht (mehr), also nichts zu tun. */
 463                         Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
 464                         return CONNECTED;
 465                 }
 466
 467                 Client_Destroy( target, "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 468
 469                 return CONNECTED;
 470         }
 471         else
 472         {
 473                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 474                         /* " " to avoid confusion */
 475                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 476                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 477                         strlcat(quitmsg, "\"", sizeof quitmsg );
 478                 }
 479
 480                 /* User, Service, oder noch nicht registriert */
 481                 Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 482
 483                 return DISCONNECTED;
 484         }
 485 } /* IRC_QUIT */
 486
 487
 488 GLOBAL bool
 489 IRC_PING(CLIENT *Client, REQUEST *Req)
 490 {
 491         CLIENT *target, *from;
 492
 493         assert(Client != NULL);
 494         assert(Req != NULL);
 495
 496         /* Wrong number of arguments? */
 497         if (Req->argc < 1)
 498                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 499                                           Client_ID(Client));
 500 #ifdef STRICT_RFC
 501         /* Don't ignore additional arguments when in "strict" mode */
 502         if (Req->argc > 2)
 503                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 504                                            Client_ID(Client), Req->command);
 505 #endif
 506
 507         if (Req->argc > 1) {
 508                 /* A target has been specified ... */
 509                 target = Client_Search(Req->argv[1]);
 510
 511                 if (!target || Client_Type(target) != CLIENT_SERVER)
 512                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 513                                         Client_ID(Client), Req->argv[1]);
 514
 515                 if (target != Client_ThisServer()) {
 516                         /* Ok, we have to forward the PING */
 517                         if (Client_Type(Client) == CLIENT_SERVER)
 518                                 from = Client_Search(Req->prefix);
 519                         else
 520                                 from = Client;
 521                         if (!from)
 522                                 return IRC_WriteStrClient(Client,
 523                                                 ERR_NOSUCHSERVER_MSG,
 524                                                 Client_ID(Client), Req->prefix);
 525
 526                         return IRC_WriteStrClientPrefix(target, from,
 527                                         "PING %s :%s", Req->argv[0],
 528                                         Req->argv[1] );
 529                 }
 530         }
 531
 532         if (Client_Type(Client) == CLIENT_SERVER) {
 533                 if (Req->prefix)
 534                         from = Client_Search(Req->prefix);
 535                 else
 536                         from = Client;
 537         } else
 538                 from = Client_ThisServer();
 539         if (!from)
 540                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 541                                         Client_ID(Client), Req->prefix);
 542
 543         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 544             Client_Conn(Client));
 545
 546 #ifdef STRICT_RFC
 547         return IRC_WriteStrClient(Client, "PONG %s :%s",
 548                 Client_ID(from), Client_ID(Client));
 549 #else
 550         /* Some clients depend on the argument being returned in the PONG
 551          * reply (not mentioned in any RFC, though) */
 552         return IRC_WriteStrClient(Client, "PONG %s :%s",
 553                 Client_ID(from), Req->argv[0]);
 554 #endif
 555 } /* IRC_PING */
 556
 557
 558 GLOBAL bool
 559 IRC_PONG(CLIENT *Client, REQUEST *Req)
 560 {
 561         CLIENT *target, *from;
 562         char *s;
 563
 564         assert(Client != NULL);
 565         assert(Req != NULL);
 566
 567         /* Wrong number of arguments? */
 568         if (Req->argc < 1)
 569                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 570                                           Client_ID(Client));
 571         if (Req->argc > 2)
 572                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 573                                           Client_ID(Client), Req->command);
 574
 575         /* Forward? */
 576         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 577                 target = Client_Search(Req->argv[0]);
 578                 if (!target)
 579                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 580                                         Client_ID(Client), Req->argv[0]);
 581
 582                 from = Client_Search(Req->prefix);
 583
 584                 if (target != Client_ThisServer() && target != from) {
 585                         /* Ok, we have to forward the message. */
 586                         if (!from)
 587                                 return IRC_WriteStrClient(Client,
 588                                                 ERR_NOSUCHSERVER_MSG,
 589                                                 Client_ID(Client), Req->prefix);
 590
 591                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 592                                 s = Client_ID(from);
 593                         else
 594                                 s = Req->argv[0];
 595                         return IRC_WriteStrClientPrefix(target, from,
 596                                  "PONG %s :%s", s, Req->argv[1]);
 597                 }
 598         }
 599
 600         /* The connection timestamp has already been updated when the data has
 601          * been read from so socket, so we don't need to update it here. */
 602
 603         if (Client_Conn(Client) > NONE)
 604                 Log(LOG_DEBUG,
 605                         "Connection %d: received PONG. Lag: %ld seconds.",
 606                         Client_Conn(Client),
 607                         time(NULL) - Conn_LastPing(Client_Conn(Client)));
 608         else
 609                  Log(LOG_DEBUG,
 610                         "Connection %d: received PONG.", Client_Conn(Client));
 611
 612         return CONNECTED;
 613 } /* IRC_PONG */
 614
 615
 616 static bool
 617 Hello_User(CLIENT * Client)
 618 {
 619         assert(Client != NULL);
 620
 621         /* Check password ... */
 622         if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 623                 /* Bad password! */
 624                 Log(LOG_ERR,
 625                     "User \"%s\" rejected (connection %d): Bad password!",
 626                     Client_Mask(Client), Client_Conn(Client));
 627                 Conn_Close(Client_Conn(Client), NULL, "Bad password", true);
 628                 return DISCONNECTED;
 629         }
 630
 631         Log(LOG_NOTICE, "User \"%s\" registered (connection %d).",
 632             Client_Mask(Client), Client_Conn(Client));
 633
 634         /* Inform other servers */
 635         IRC_WriteStrServers(NULL, "NICK %s 1 %s %s 1 +%s :%s",
 636                             Client_ID(Client), Client_User(Client),
 637                             Client_Hostname(Client), Client_Modes(Client),
 638                             Client_Info(Client));
 639
 640         if (!IRC_WriteStrClient
 641             (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
 642                 return false;
 643         if (!IRC_WriteStrClient
 644             (Client, RPL_YOURHOST_MSG, Client_ID(Client),
 645              Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
 646              TARGET_VENDOR, TARGET_OS))
 647                 return false;
 648         if (!IRC_WriteStrClient
 649             (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
 650                 return false;
 651         if (!IRC_WriteStrClient
 652             (Client, RPL_MYINFO_MSG, Client_ID(Client),
 653              Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
 654              CHANMODES))
 655                 return false;
 656
 657         /* Features supported by this server (005 numeric, ISUPPORT),
 658          * see <http://www.irc.org/tech_docs/005.html> for details. */
 659         if (!IRC_Send_ISUPPORT(Client))
 660                 return DISCONNECTED;
 661
 662         Client_SetType(Client, CLIENT_USER);
 663
 664         if (!IRC_Send_LUSERS(Client))
 665                 return DISCONNECTED;
 666         if (!IRC_Show_MOTD(Client))
 667                 return DISCONNECTED;
 668
 669         /* Suspend the client for a second ... */
 670         IRC_SetPenalty(Client, 1);
 671
 672         return CONNECTED;
 673 } /* Hello_User */
 674
 675
 676 static void
 677 Kill_Nick( char *Nick, char *Reason )
 678 {
 679         REQUEST r;
 680
 681         assert( Nick != NULL );
 682         assert( Reason != NULL );
 683
 684         r.prefix = (char *)Client_ThisServer( );
 685         r.argv[0] = Nick;
 686         r.argv[1] = Reason;
 687         r.argc = 2;
 688
 689         Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
 690         IRC_KILL( Client_ThisServer( ), &r );
 691 } /* Kill_Nick */
 692
 693
 694 /* -eof- */