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 static void Introduce_Client PARAMS((CLIENT *To, CLIENT *Client, int Type));
  44 static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
  45                                        void *i));
  46
  47
  48 /**
  49  * Handler for the IRC command "PASS".
  50  * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
  51  */
  52 GLOBAL bool
  53 IRC_PASS( CLIENT *Client, REQUEST *Req )
  54 {
  55         char *type, *orig_flags;
  56         int protohigh, protolow;
  57
  58         assert( Client != NULL );
  59         assert( Req != NULL );
  60
  61         /* Return an error if this is not a local client */
  62         if (Client_Conn(Client) <= NONE)
  63                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  64                                           Client_ID(Client), Req->command);
  65
  66         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  67                 /* Not yet registered "unknown" connection, PASS with one
  68                  * argument: either a regular client, service, or server
  69                  * using the old RFC 1459 section 4.1.1 syntax. */
  70                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  71                          Client_Conn(Client));
  72         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  73                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  74                    (Req->argc == 3 || Req->argc == 4)) {
  75                 /* Not yet registered "unknown" connection or outgoing server
  76                  * link, PASS with three or four argument: server using the
  77                  * RFC 2813 section 4.1.1 syntax. */
  78                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  79                          Client_Conn(Client));
  80         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  81                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  82                 /* Unregistered connection, but wrong number of arguments: */
  83                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  84                                           Client_ID(Client), Req->command);
  85         } else {
  86                 /* Registered connection, PASS command is not allowed! */
  87                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
  88                                           Client_ID(Client));
  89         }
  90
  91         Client_SetPassword(Client, Req->argv[0]);
  92
  93         /* Protocol version */
  94         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
  95                 int c2, c4;
  96
  97                 c2 = Req->argv[1][2];
  98                 c4 = Req->argv[1][4];
  99
 100                 Req->argv[1][4] = '\0';
 101                 protolow = atoi(&Req->argv[1][2]);
 102                 Req->argv[1][2] = '\0';
 103                 protohigh = atoi(Req->argv[1]);
 104
 105                 Req->argv[1][2] = c2;
 106                 Req->argv[1][4] = c4;
 107
 108                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 109         } else {
 110                 protohigh = protolow = 0;
 111                 Client_SetType(Client, CLIENT_GOTPASS);
 112         }
 113
 114         /* Protocol type, see doc/Protocol.txt */
 115         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 116                 type = &Req->argv[1][4];
 117         else
 118                 type = NULL;
 119
 120         /* Protocol flags/options */
 121         if (Req->argc >= 4)
 122                 orig_flags = Req->argv[3];
 123         else
 124                 orig_flags = "";
 125
 126         /* Implementation, version and IRC+ flags */
 127         if (Req->argc >= 3) {
 128                 char *impl, *ptr, *serverver, *flags;
 129
 130                 impl = Req->argv[2];
 131                 ptr = strchr(impl, '|');
 132                 if (ptr)
 133                         *ptr = '\0';
 134
 135                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 136                         /* The peer seems to be a server which supports the
 137                          * IRC+ protocol (see doc/Protocol.txt). */
 138                         serverver = ptr + 1;
 139                         flags = strchr(serverver, ':');
 140                         if (flags) {
 141                                 *flags = '\0';
 142                                 flags++;
 143                         } else
 144                                 flags = "";
 145                         Log(LOG_INFO,
 146                             "Peer announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 147                             impl, serverver, protohigh, protolow, flags);
 148                 } else {
 149                         /* The peer seems to be a server supporting the
 150                          * "original" IRC protocol (RFC 2813). */
 151                         serverver = "";
 152                         if (strchr(orig_flags, 'Z'))
 153                                 flags = "Z";
 154                         else
 155                                 flags = "";
 156                         Log(LOG_INFO,
 157                             "Peer announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 158                             impl, protohigh, protolow, flags);
 159                 }
 160                 Client_SetFlags(Client, flags);
 161         }
 162
 163         return CONNECTED;
 164 } /* IRC_PASS */
 165
 166
 167 /**
 168  * IRC "NICK" command.
 169  * This function implements the IRC command "NICK" which is used to register
 170  * with the server, to change already registered nicknames and to introduce
 171  * new users which are connected to other servers.
 172  */
 173 GLOBAL bool
 174 IRC_NICK( CLIENT *Client, REQUEST *Req )
 175 {
 176         CLIENT *intr_c, *target, *c;
 177         char *nick, *user, *hostname, *modes, *info;
 178         int token, hops;
 179
 180         assert( Client != NULL );
 181         assert( Req != NULL );
 182
 183         /* Some IRC clients, for example BitchX, send the NICK and USER
 184          * commands in the wrong order ... */
 185         if(Client_Type(Client) == CLIENT_UNKNOWN
 186             || Client_Type(Client) == CLIENT_GOTPASS
 187             || Client_Type(Client) == CLIENT_GOTNICK
 188 #ifndef STRICT_RFC
 189             || Client_Type(Client) == CLIENT_GOTUSER
 190 #endif
 191             || Client_Type(Client) == CLIENT_USER
 192             || Client_Type(Client) == CLIENT_SERVICE
 193             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 194         {
 195                 /* User registration or change of nickname */
 196
 197                 /* Wrong number of arguments? */
 198                 if( Req->argc != 1 )
 199                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 200                                                    Client_ID( Client ),
 201                                                    Req->command );
 202
 203                 /* Search "target" client */
 204                 if( Client_Type( Client ) == CLIENT_SERVER )
 205                 {
 206                         target = Client_Search( Req->prefix );
 207                         if( ! target )
 208                                 return IRC_WriteStrClient( Client,
 209                                                            ERR_NOSUCHNICK_MSG,
 210                                                            Client_ID( Client ),
 211                                                            Req->argv[0] );
 212                 }
 213                 else
 214                 {
 215                         /* Is this a restricted client? */
 216                         if( Client_HasMode( Client, 'r' ))
 217                                 return IRC_WriteStrClient( Client,
 218                                                            ERR_RESTRICTED_MSG,
 219                                                            Client_ID( Client ));
 220
 221                         target = Client;
 222                 }
 223
 224 #ifndef STRICT_RFC
 225                 /* If the clients tries to change to its own nickname we won't
 226                  * do anything. This is how the original ircd behaves and some
 227                  * clients (for example Snak) expect it to be like this.
 228                  * But I doubt that this is "really the right thing" ... */
 229                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 230                         return CONNECTED;
 231 #endif
 232
 233                 /* Check that the new nickname is available. Special case:
 234                  * the client only changes from/to upper to lower case. */
 235                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 236                 {
 237                         if( ! Client_CheckNick( target, Req->argv[0] ))
 238                                 return CONNECTED;
 239                 }
 240
 241                 if (Client_Type(target) != CLIENT_USER &&
 242                     Client_Type(target) != CLIENT_SERVICE &&
 243                     Client_Type(target) != CLIENT_SERVER) {
 244                         /* New client */
 245                         LogDebug("Connection %d: got valid NICK command ...",
 246                              Client_Conn( Client ));
 247
 248                         /* Register new nickname of this client */
 249                         Client_SetID( target, Req->argv[0] );
 250
 251                         /* If we received a valid USER command already then
 252                          * register the new client! */
 253                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 254                                 return Hello_User( Client );
 255                         else
 256                                 Client_SetType( Client, CLIENT_GOTNICK );
 257                 } else {
 258                         /* Nickname change */
 259                         if (Client_Conn(target) > NONE) {
 260                                 /* Local client */
 261                                 Log(LOG_INFO,
 262                                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 263                                     Client_TypeText(target), Client_Mask(target),
 264                                     Client_Conn(target), Client_ID(target),
 265                                     Req->argv[0]);
 266                                 Conn_UpdateIdle(Client_Conn(target));
 267                         } else {
 268                                 /* Remote client */
 269                                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 270                                          Client_TypeText(target),
 271                                          Client_Mask(target), Client_ID(target),
 272                                          Req->argv[0]);
 273                         }
 274
 275                         /* Inform all users and servers (which have to know)
 276                          * of this nickname change */
 277                         if( Client_Type( Client ) == CLIENT_USER )
 278                                 IRC_WriteStrClientPrefix( Client, Client,
 279                                                           "NICK :%s",
 280                                                           Req->argv[0] );
 281                         IRC_WriteStrServersPrefix( Client, target,
 282                                                    "NICK :%s", Req->argv[0] );
 283                         IRC_WriteStrRelatedPrefix( target, target, false,
 284                                                    "NICK :%s", Req->argv[0] );
 285
 286                         /* Register old nickname for WHOWAS queries */
 287                         Client_RegisterWhowas( target );
 288
 289                         /* Save new nickname */
 290                         Client_SetID( target, Req->argv[0] );
 291
 292                         IRC_SetPenalty( target, 2 );
 293                 }
 294
 295                 return CONNECTED;
 296         } else if(Client_Type(Client) == CLIENT_SERVER ||
 297                   Client_Type(Client) == CLIENT_SERVICE) {
 298                 /* Server or service introduces new client */
 299
 300                 /* Bad number of parameters? */
 301                 if (Req->argc != 2 && Req->argc != 7)
 302                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 303                                                   Client_ID(Client), Req->command);
 304
 305                 if (Req->argc >= 7) {
 306                         /* RFC 2813 compatible syntax */
 307                         nick = Req->argv[0];
 308                         hops = atoi(Req->argv[1]);
 309                         user = Req->argv[2];
 310                         hostname = Req->argv[3];
 311                         token = atoi(Req->argv[4]);
 312                         modes = Req->argv[5] + 1;
 313                         info = Req->argv[6];
 314                 } else {
 315                         /* RFC 1459 compatible syntax */
 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                 /* RFC 2813: client is now fully registered, inform all the
 359                  * other servers about the new user.
 360                  * RFC 1459: announce the new client only after receiving the
 361                  * USER command, first we need more information! */
 362                 if (Req->argc < 7) {
 363                         LogDebug("Client \"%s\" is beeing registered (RFC 1459) ...",
 364                                  Client_Mask(c));
 365                         Client_SetType(c, CLIENT_GOTNICK);
 366                 } else
 367                         Introduce_Client(Client, c, CLIENT_USER);
 368
 369                 return CONNECTED;
 370         }
 371         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 372 } /* IRC_NICK */
 373
 374
 375 /**
 376  * Handler for the IRC command "USER".
 377  */
 378 GLOBAL bool
 379 IRC_USER(CLIENT * Client, REQUEST * Req)
 380 {
 381         CLIENT *c;
 382 #ifdef IDENTAUTH
 383         char *ptr;
 384 #endif
 385
 386         assert(Client != NULL);
 387         assert(Req != NULL);
 388
 389         if (Client_Type(Client) == CLIENT_GOTNICK ||
 390 #ifndef STRICT_RFC
 391             Client_Type(Client) == CLIENT_UNKNOWN ||
 392 #endif
 393             Client_Type(Client) == CLIENT_GOTPASS)
 394         {
 395                 /* New connection */
 396                 if (Req->argc != 4)
 397                         return IRC_WriteStrClient(Client,
 398                                                   ERR_NEEDMOREPARAMS_MSG,
 399                                                   Client_ID(Client),
 400                                                   Req->command);
 401
 402                 /* User name */
 403 #ifdef IDENTAUTH
 404                 ptr = Client_User(Client);
 405                 if (!ptr || !*ptr || *ptr == '~')
 406                         Client_SetUser(Client, Req->argv[0], false);
 407 #else
 408                 Client_SetUser(Client, Req->argv[0], false);
 409 #endif
 410
 411                 /* "Real name" or user info text: Don't set it to the empty
 412                  * string, the original ircd can't deal with such "real names"
 413                  * (e. g. "USER user * * :") ... */
 414                 if (*Req->argv[3])
 415                         Client_SetInfo(Client, Req->argv[3]);
 416                 else
 417                         Client_SetInfo(Client, "-");
 418
 419                 LogDebug("Connection %d: got valid USER command ...",
 420                     Client_Conn(Client));
 421                 if (Client_Type(Client) == CLIENT_GOTNICK)
 422                         return Hello_User(Client);
 423                 else
 424                         Client_SetType(Client, CLIENT_GOTUSER);
 425                 return CONNECTED;
 426
 427         } else if (Client_Type(Client) == CLIENT_SERVER ||
 428                    Client_Type(Client) == CLIENT_SERVICE) {
 429                 /* Server/service updating an user */
 430                 if (Req->argc != 4)
 431                         return IRC_WriteStrClient(Client,
 432                                                   ERR_NEEDMOREPARAMS_MSG,
 433                                                   Client_ID(Client),
 434                                                   Req->command);
 435                 c = Client_Search(Req->prefix);
 436                 if (!c)
 437                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 438                                                   Client_ID(Client),
 439                                                   Req->prefix);
 440
 441                 Client_SetUser(c, Req->argv[0], true);
 442                 Client_SetHostname(c, Req->argv[1]);
 443                 Client_SetInfo(c, Req->argv[3]);
 444
 445                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 446                          Client_Conn(Client), Client_Mask(c));
 447
 448                 /* RFC 1459 style user registration?
 449                  * Introduce client to network: */
 450                 if (Client_Type(c) == CLIENT_GOTNICK)
 451                         Introduce_Client(Client, c, CLIENT_USER);
 452
 453                 return CONNECTED;
 454         } else if (Client_Type(Client) == CLIENT_USER) {
 455                 /* Already registered connection */
 456                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 457                                           Client_ID(Client));
 458         } else {
 459                 /* Unexpected/invalid connection state? */
 460                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 461                                           Client_ID(Client));
 462         }
 463 } /* IRC_USER */
 464
 465
 466 /**
 467  * Handler for the IRC command "SERVICE".
 468  * This function implements IRC Services registration using the SERVICE command
 469  * defined in RFC 2812 3.1.6 and RFC 2813 4.1.4.
 470  * At the moment ngIRCd doesn't support directly linked services, so this
 471  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 472  * received from a peer server.
 473  */
 474 GLOBAL bool
 475 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 476 {
 477         CLIENT *c, *intr_c;
 478         char *nick, *user, *host, *info, *modes, *ptr;
 479         int token, hops;
 480
 481         assert(Client != NULL);
 482         assert(Req != NULL);
 483
 484         if (Client_Type(Client) != CLIENT_GOTPASS &&
 485             Client_Type(Client) != CLIENT_SERVER)
 486                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 487                                           Client_ID(Client));
 488
 489         if (Req->argc != 6)
 490                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 491                                           Client_ID(Client), Req->command);
 492
 493         if (Client_Type(Client) != CLIENT_SERVER)
 494                 return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 495                                   Client_ID(Client), Req->argv[0]);
 496
 497         /* Bad number of parameters? */
 498         if (Req->argc != 6)
 499                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 500                                           Client_ID(Client), Req->command);
 501
 502         nick = Req->argv[0];
 503         user = NULL; host = NULL;
 504         token = atoi(Req->argv[1]);
 505         hops = atoi(Req->argv[4]);
 506         info = Req->argv[5];
 507
 508         /* Validate service name ("nick name") */
 509         c = Client_Search(nick);
 510         if(c) {
 511                 /* Nick name collission: disconnect (KILL) both clients! */
 512                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 513                     Client_ID(Client), nick);
 514                 Kill_Nick(nick, "Nick collision");
 515                 return CONNECTED;
 516         }
 517
 518         /* Get the server to which the service is connected */
 519         intr_c = Client_GetFromToken(Client, token);
 520         if (! intr_c) {
 521                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 522                     Client_ID(Client), nick);
 523                 Kill_Nick(nick, "Unknown server");
 524                 return CONNECTED;
 525         }
 526
 527         /* Get user and host name */
 528         ptr = strchr(nick, '@');
 529         if (ptr) {
 530                 *ptr = '\0';
 531                 host = ++ptr;
 532         }
 533         if (!host)
 534                 host = Client_Hostname(intr_c);
 535         ptr = strchr(nick, '!');
 536         if (ptr) {
 537                 *ptr = '\0';
 538                 user = ++ptr;
 539         }
 540         if (!user)
 541                 user = nick;
 542
 543         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 544          * for future usage"; but we use it to transfer the modes and check
 545          * that the first character is a '+' sign and ignore it otherwise. */
 546         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 547
 548         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 549                                  token, modes, info, true);
 550         if (! c) {
 551                 /* Couldn't create client structure, so KILL the service to
 552                  * keep network status consistent ... */
 553                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 554                     Client_Conn(Client));
 555                 Kill_Nick(nick, "Server error");
 556                 return CONNECTED;
 557         }
 558
 559         Introduce_Client(Client, c, CLIENT_SERVICE);
 560         return CONNECTED;
 561 } /* IRC_SERVICE */
 562
 563
 564 GLOBAL bool
 565 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 566 {
 567         CLIENT *target;
 568         char quitmsg[LINE_LEN];
 569
 570         assert( Client != NULL );
 571         assert( Req != NULL );
 572
 573         /* Wrong number of arguments? */
 574         if( Req->argc > 1 )
 575                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 576
 577         if (Req->argc == 1)
 578                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 579
 580         if ( Client_Type( Client ) == CLIENT_SERVER )
 581         {
 582                 /* Server */
 583                 target = Client_Search( Req->prefix );
 584                 if( ! target )
 585                 {
 586                         /* Den Client kennen wir nicht (mehr), also nichts zu tun. */
 587                         Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
 588                         return CONNECTED;
 589                 }
 590
 591                 Client_Destroy( target, "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 592
 593                 return CONNECTED;
 594         }
 595         else
 596         {
 597                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 598                         /* " " to avoid confusion */
 599                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 600                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 601                         strlcat(quitmsg, "\"", sizeof quitmsg );
 602                 }
 603
 604                 /* User, Service, oder noch nicht registriert */
 605                 Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 606
 607                 return DISCONNECTED;
 608         }
 609 } /* IRC_QUIT */
 610
 611
 612 GLOBAL bool
 613 IRC_PING(CLIENT *Client, REQUEST *Req)
 614 {
 615         CLIENT *target, *from;
 616
 617         assert(Client != NULL);
 618         assert(Req != NULL);
 619
 620         /* Wrong number of arguments? */
 621         if (Req->argc < 1)
 622                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 623                                           Client_ID(Client));
 624 #ifdef STRICT_RFC
 625         /* Don't ignore additional arguments when in "strict" mode */
 626         if (Req->argc > 2)
 627                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 628                                            Client_ID(Client), Req->command);
 629 #endif
 630
 631         if (Req->argc > 1) {
 632                 /* A target has been specified ... */
 633                 target = Client_Search(Req->argv[1]);
 634
 635                 if (!target || Client_Type(target) != CLIENT_SERVER)
 636                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 637                                         Client_ID(Client), Req->argv[1]);
 638
 639                 if (target != Client_ThisServer()) {
 640                         /* Ok, we have to forward the PING */
 641                         if (Client_Type(Client) == CLIENT_SERVER)
 642                                 from = Client_Search(Req->prefix);
 643                         else
 644                                 from = Client;
 645                         if (!from)
 646                                 return IRC_WriteStrClient(Client,
 647                                                 ERR_NOSUCHSERVER_MSG,
 648                                                 Client_ID(Client), Req->prefix);
 649
 650                         return IRC_WriteStrClientPrefix(target, from,
 651                                         "PING %s :%s", Req->argv[0],
 652                                         Req->argv[1] );
 653                 }
 654         }
 655
 656         if (Client_Type(Client) == CLIENT_SERVER) {
 657                 if (Req->prefix)
 658                         from = Client_Search(Req->prefix);
 659                 else
 660                         from = Client;
 661         } else
 662                 from = Client_ThisServer();
 663         if (!from)
 664                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 665                                         Client_ID(Client), Req->prefix);
 666
 667         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 668             Client_Conn(Client));
 669
 670 #ifdef STRICT_RFC
 671         return IRC_WriteStrClient(Client, "PONG %s :%s",
 672                 Client_ID(from), Client_ID(Client));
 673 #else
 674         /* Some clients depend on the argument being returned in the PONG
 675          * reply (not mentioned in any RFC, though) */
 676         return IRC_WriteStrClient(Client, "PONG %s :%s",
 677                 Client_ID(from), Req->argv[0]);
 678 #endif
 679 } /* IRC_PING */
 680
 681
 682 GLOBAL bool
 683 IRC_PONG(CLIENT *Client, REQUEST *Req)
 684 {
 685         CLIENT *target, *from;
 686         char *s;
 687
 688         assert(Client != NULL);
 689         assert(Req != NULL);
 690
 691         /* Wrong number of arguments? */
 692         if (Req->argc < 1)
 693                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 694                                           Client_ID(Client));
 695         if (Req->argc > 2)
 696                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 697                                           Client_ID(Client), Req->command);
 698
 699         /* Forward? */
 700         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 701                 target = Client_Search(Req->argv[0]);
 702                 if (!target)
 703                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 704                                         Client_ID(Client), Req->argv[0]);
 705
 706                 from = Client_Search(Req->prefix);
 707
 708                 if (target != Client_ThisServer() && target != from) {
 709                         /* Ok, we have to forward the message. */
 710                         if (!from)
 711                                 return IRC_WriteStrClient(Client,
 712                                                 ERR_NOSUCHSERVER_MSG,
 713                                                 Client_ID(Client), Req->prefix);
 714
 715                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 716                                 s = Client_ID(from);
 717                         else
 718                                 s = Req->argv[0];
 719                         return IRC_WriteStrClientPrefix(target, from,
 720                                  "PONG %s :%s", s, Req->argv[1]);
 721                 }
 722         }
 723
 724         /* The connection timestamp has already been updated when the data has
 725          * been read from so socket, so we don't need to update it here. */
 726 #ifdef DEBUG
 727         if (Client_Conn(Client) > NONE)
 728                 Log(LOG_DEBUG,
 729                         "Connection %d: received PONG. Lag: %ld seconds.",
 730                         Client_Conn(Client),
 731                         time(NULL) - Conn_LastPing(Client_Conn(Client)));
 732         else
 733                  Log(LOG_DEBUG,
 734                         "Connection %d: received PONG.", Client_Conn(Client));
 735 #endif
 736         return CONNECTED;
 737 } /* IRC_PONG */
 738
 739
 740 static bool
 741 Hello_User(CLIENT * Client)
 742 {
 743         assert(Client != NULL);
 744
 745         /* Check password ... */
 746         if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 747                 /* Bad password! */
 748                 Log(LOG_ERR,
 749                     "Client \"%s\" rejected (connection %d): Bad password!",
 750                     Client_Mask(Client), Client_Conn(Client));
 751                 Conn_Close(Client_Conn(Client), NULL, "Bad password", true);
 752                 return DISCONNECTED;
 753         }
 754
 755         Introduce_Client(NULL, Client, CLIENT_USER);
 756
 757         if (!IRC_WriteStrClient
 758             (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
 759                 return false;
 760         if (!IRC_WriteStrClient
 761             (Client, RPL_YOURHOST_MSG, Client_ID(Client),
 762              Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
 763              TARGET_VENDOR, TARGET_OS))
 764                 return false;
 765         if (!IRC_WriteStrClient
 766             (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
 767                 return false;
 768         if (!IRC_WriteStrClient
 769             (Client, RPL_MYINFO_MSG, Client_ID(Client),
 770              Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
 771              CHANMODES))
 772                 return false;
 773
 774         /* Features supported by this server (005 numeric, ISUPPORT),
 775          * see <http://www.irc.org/tech_docs/005.html> for details. */
 776         if (!IRC_Send_ISUPPORT(Client))
 777                 return DISCONNECTED;
 778
 779         if (!IRC_Send_LUSERS(Client))
 780                 return DISCONNECTED;
 781         if (!IRC_Show_MOTD(Client))
 782                 return DISCONNECTED;
 783
 784         /* Suspend the client for a second ... */
 785         IRC_SetPenalty(Client, 1);
 786
 787         return CONNECTED;
 788 } /* Hello_User */
 789
 790
 791 static void
 792 Kill_Nick( char *Nick, char *Reason )
 793 {
 794         REQUEST r;
 795
 796         assert( Nick != NULL );
 797         assert( Reason != NULL );
 798
 799         r.prefix = (char *)Client_ThisServer( );
 800         r.argv[0] = Nick;
 801         r.argv[1] = Reason;
 802         r.argc = 2;
 803
 804         Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
 805         IRC_KILL( Client_ThisServer( ), &r );
 806 } /* Kill_Nick */
 807
 808
 809 static void
 810 Introduce_Client(CLIENT *From, CLIENT *Client, int Type)
 811 {
 812         /* Set client type (user or service) */
 813         Client_SetType(Client, Type);
 814
 815         if (From) {
 816                 if (Conf_IsService(Conf_GetServer(Client_Conn(From)),
 817                                    Client_ID(Client)))
 818                         Client_SetType(Client, CLIENT_SERVICE);
 819                 LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
 820                          Client_TypeText(Client), Client_Mask(Client),
 821                          Client_Modes(Client), Client_ID(From),
 822                          Client_ID(Client_Introducer(Client)),
 823                          Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
 824         } else
 825                 Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
 826                     Client_TypeText(Client), Client_Mask(Client),
 827                     Client_Conn(Client));
 828
 829         /* Inform other servers */
 830         IRC_WriteStrServersPrefixFlag_CB(From,
 831                                 From != NULL ? From : Client_ThisServer(),
 832                                 '\0', cb_introduceClient, (void *)Client);
 833 } /* Introduce_Client */
 834
 835
 836 static void
 837 cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
 838 {
 839         CLIENT *c = (CLIENT *)data;
 840         CONN_ID conn;
 841         char *modes, *user, *host;
 842
 843         modes = Client_Modes(c);
 844         user = Client_User(c) ? Client_User(c) : "-";
 845         host = Client_Hostname(c) ? Client_Hostname(c) : "-";
 846
 847         conn = Client_Conn(To);
 848         if (Conn_Options(conn) & CONN_RFC1459) {
 849                 /* RFC 1459 mode: separate NICK and USER commands */
 850                 Conn_WriteStr(conn, "NICK %s :%d", Client_ID(c),
 851                               Client_Hops(c) + 1);
 852                 Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
 853                               Client_ID(c), user, host,
 854                               Client_ID(Client_Introducer(c)), Client_Info(c));
 855                 if (modes[0])
 856                         Conn_WriteStr(conn, ":%s MODE %s +%s",
 857                                       Client_ID(c), Client_ID(c), modes);
 858         } else {
 859                 /* RFC 2813 mode: one combined NICK or SERVICE command */
 860                 if (Client_Type(c) == CLIENT_SERVICE
 861                     && strchr(Client_Flags(To), 'S'))
 862                         IRC_WriteStrClientPrefix(To, Prefix,
 863                                          "SERVICE %s %d * +%s %d :%s",
 864                                          Client_Mask(c),
 865                                          Client_MyToken(Client_Introducer(c)),
 866                                          Client_Modes(c), Client_Hops(c) + 1,
 867                                          Client_Info(c));
 868                 else
 869                         IRC_WriteStrClientPrefix(To, Prefix,
 870                                          "NICK %s %d %s %s %d +%s :%s",
 871                                          Client_ID(c), Client_Hops(c) + 1,
 872                                          user, host,
 873                                          Client_MyToken(Client_Introducer(c)),
 874                                          modes, Client_Info(c));
 875         }
 876 } /* cb_introduceClient */
 877
 878
 879 /* -eof- */