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));
  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 #ifndef STRICT_RFC
 184         /* Some IRC clients, for example BitchX, send the NICK and USER
 185          * commands in the wrong order ... */
 186         if( Client_Type( Client ) == CLIENT_UNKNOWN
 187             || Client_Type( Client ) == CLIENT_GOTPASS
 188             || Client_Type( Client ) == CLIENT_GOTNICK
 189             || Client_Type( Client ) == CLIENT_GOTUSER
 190             || Client_Type( Client ) == CLIENT_USER
 191             || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
 192 #else
 193         if( Client_Type( Client ) == CLIENT_UNKNOWN
 194             || Client_Type( Client ) == CLIENT_GOTPASS
 195             || Client_Type( Client ) == CLIENT_GOTNICK
 196             || Client_Type( Client ) == CLIENT_USER
 197             || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
 198 #endif
 199         {
 200                 /* User registration or change of nickname */
 201
 202                 /* Wrong number of arguments? */
 203                 if( Req->argc != 1 )
 204                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 205                                                    Client_ID( Client ),
 206                                                    Req->command );
 207
 208                 /* Search "target" client */
 209                 if( Client_Type( Client ) == CLIENT_SERVER )
 210                 {
 211                         target = Client_Search( Req->prefix );
 212                         if( ! target )
 213                                 return IRC_WriteStrClient( Client,
 214                                                            ERR_NOSUCHNICK_MSG,
 215                                                            Client_ID( Client ),
 216                                                            Req->argv[0] );
 217                 }
 218                 else
 219                 {
 220                         /* Is this a restricted client? */
 221                         if( Client_HasMode( Client, 'r' ))
 222                                 return IRC_WriteStrClient( Client,
 223                                                            ERR_RESTRICTED_MSG,
 224                                                            Client_ID( Client ));
 225
 226                         target = Client;
 227                 }
 228
 229 #ifndef STRICT_RFC
 230                 /* If the clients tries to change to its own nickname we won't
 231                  * do anything. This is how the original ircd behaves and some
 232                  * clients (for example Snak) expect it to be like this.
 233                  * But I doubt that this is "really the right thing" ... */
 234                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 235                         return CONNECTED;
 236 #endif
 237
 238                 /* Check that the new nickname is available. Special case:
 239                  * the client only changes from/to upper to lower case. */
 240                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 241                 {
 242                         if( ! Client_CheckNick( target, Req->argv[0] ))
 243                                 return CONNECTED;
 244                 }
 245
 246                 if(( Client_Type( target ) != CLIENT_USER )
 247                    && ( Client_Type( target ) != CLIENT_SERVER ))
 248                 {
 249                         /* New client */
 250                         Log( LOG_DEBUG, "Connection %d: got valid NICK command ...",
 251                              Client_Conn( Client ));
 252
 253                         /* Register new nickname of this client */
 254                         Client_SetID( target, Req->argv[0] );
 255
 256                         /* If we received a valid USER command already then
 257                          * register the new client! */
 258                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 259                                 return Hello_User( Client );
 260                         else
 261                                 Client_SetType( Client, CLIENT_GOTNICK );
 262                 }
 263                 else
 264                 {
 265                         /* Nickname change */
 266                         if (Client_Conn(target) > NONE) {
 267                                 /* Local client */
 268                                 Log(LOG_INFO,
 269                                     "User \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 270                                     Client_Mask(target), Client_Conn(target),
 271                                     Client_ID(target), Req->argv[0]);
 272                                 Conn_UpdateIdle(Client_Conn(target));
 273                         }
 274                         else
 275                         {
 276                                 /* Remote client */
 277                                 Log( LOG_DEBUG,
 278                                      "User \"%s\" changed nick: \"%s\" -> \"%s\".",
 279                                      Client_Mask( target ), Client_ID( target ),
 280                                      Req->argv[0] );
 281                         }
 282
 283                         /* Inform all users and servers (which have to know)
 284                          * of this nickname change */
 285                         if( Client_Type( Client ) == CLIENT_USER )
 286                                 IRC_WriteStrClientPrefix( Client, Client,
 287                                                           "NICK :%s",
 288                                                           Req->argv[0] );
 289                         IRC_WriteStrServersPrefix( Client, target,
 290                                                    "NICK :%s", Req->argv[0] );
 291                         IRC_WriteStrRelatedPrefix( target, target, false,
 292                                                    "NICK :%s", Req->argv[0] );
 293
 294                         /* Register old nickname for WHOWAS queries */
 295                         Client_RegisterWhowas( target );
 296
 297                         /* Save new nickname */
 298                         Client_SetID( target, Req->argv[0] );
 299
 300                         IRC_SetPenalty( target, 2 );
 301                 }
 302
 303                 return CONNECTED;
 304         } else if(Client_Type(Client) == CLIENT_SERVER ||
 305                   Client_Type(Client) == CLIENT_SERVICE) {
 306                 /* Server or service introduces new client */
 307
 308                 /* Bad number of parameters? */
 309                 if (Req->argc != 2 && Req->argc != 7)
 310                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 311                                                   Client_ID(Client), Req->command);
 312
 313                 if (Req->argc >= 7) {
 314                         /* RFC 2813 compatible syntax */
 315                         nick = Req->argv[0];
 316                         hops = atoi(Req->argv[1]);
 317                         user = Req->argv[2];
 318                         hostname = Req->argv[3];
 319                         token = atoi(Req->argv[4]);
 320                         modes = Req->argv[5] + 1;
 321                         info = Req->argv[6];
 322                 } else {
 323                         /* RFC 1459 compatible syntax */
 324                         nick = Req->argv[0];
 325                         hops = 1;
 326                         user = Req->argv[0];
 327                         hostname = Client_ID(Client);
 328                         token = atoi(Req->argv[1]);
 329                         modes = "";
 330                         info = Req->argv[0];
 331                 }
 332
 333                 /* Nick ueberpruefen */
 334                 c = Client_Search(nick);
 335                 if(c) {
 336                         /* Der neue Nick ist auf diesem Server bereits registriert:
 337                          * sowohl der neue, als auch der alte Client muessen nun
 338                          * disconnectiert werden. */
 339                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 340                         Kill_Nick( Req->argv[0], "Nick collision" );
 341                         return CONNECTED;
 342                 }
 343
 344                 /* Server, zu dem der Client connectiert ist, suchen */
 345                 intr_c = Client_GetFromToken(Client, token);
 346                 if( ! intr_c )
 347                 {
 348                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 349                         Kill_Nick( Req->argv[0], "Unknown server" );
 350                         return CONNECTED;
 351                 }
 352
 353                 /* Neue Client-Struktur anlegen */
 354                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 355                                          token, modes, info, true);
 356                 if( ! c )
 357                 {
 358                         /* Eine neue Client-Struktur konnte nicht angelegt werden.
 359                          * Der Client muss disconnectiert werden, damit der Netz-
 360                          * status konsistent bleibt. */
 361                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 362                         Kill_Nick( Req->argv[0], "Server error" );
 363                         return CONNECTED;
 364                 }
 365
 366                 /* RFC 2813: client is now fully registered, inform all the
 367                  * other servers about the new user.
 368                  * RFC 1459: announce the new client only after receiving the
 369                  * USER command, first we need more information! */
 370                 if (Req->argc < 7) {
 371                         LogDebug("Client \"%s\" is beeing registered (RFC 1459) ...",
 372                                  Client_Mask(c));
 373                         Client_SetType(c, CLIENT_GOTNICK);
 374                 } else
 375                         Introduce_Client(Client, c);
 376
 377                 return CONNECTED;
 378         }
 379         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 380 } /* IRC_NICK */
 381
 382
 383 /**
 384  * Handler for the IRC command "USER".
 385  */
 386 GLOBAL bool
 387 IRC_USER(CLIENT * Client, REQUEST * Req)
 388 {
 389         CLIENT *c;
 390 #ifdef IDENTAUTH
 391         char *ptr;
 392 #endif
 393
 394         assert(Client != NULL);
 395         assert(Req != NULL);
 396
 397         if (Client_Type(Client) == CLIENT_GOTNICK ||
 398 #ifndef STRICT_RFC
 399             Client_Type(Client) == CLIENT_UNKNOWN ||
 400 #endif
 401             Client_Type(Client) == CLIENT_GOTPASS)
 402         {
 403                 /* New connection */
 404                 if (Req->argc != 4)
 405                         return IRC_WriteStrClient(Client,
 406                                                   ERR_NEEDMOREPARAMS_MSG,
 407                                                   Client_ID(Client),
 408                                                   Req->command);
 409
 410                 /* User name */
 411 #ifdef IDENTAUTH
 412                 ptr = Client_User(Client);
 413                 if (!ptr || !*ptr || *ptr == '~')
 414                         Client_SetUser(Client, Req->argv[0], false);
 415 #else
 416                 Client_SetUser(Client, Req->argv[0], false);
 417 #endif
 418
 419                 /* "Real name" or user info text: Don't set it to the empty
 420                  * string, the original ircd can't deal with such "real names"
 421                  * (e. g. "USER user * * :") ... */
 422                 if (*Req->argv[3])
 423                         Client_SetInfo(Client, Req->argv[3]);
 424                 else
 425                         Client_SetInfo(Client, "-");
 426
 427                 LogDebug("Connection %d: got valid USER command ...",
 428                     Client_Conn(Client));
 429                 if (Client_Type(Client) == CLIENT_GOTNICK)
 430                         return Hello_User(Client);
 431                 else
 432                         Client_SetType(Client, CLIENT_GOTUSER);
 433                 return CONNECTED;
 434
 435         } else if (Client_Type(Client) == CLIENT_SERVER ||
 436                    Client_Type(Client) == CLIENT_SERVICE) {
 437                 /* Server/service updating an user */
 438                 if (Req->argc != 4)
 439                         return IRC_WriteStrClient(Client,
 440                                                   ERR_NEEDMOREPARAMS_MSG,
 441                                                   Client_ID(Client),
 442                                                   Req->command);
 443                 c = Client_Search(Req->prefix);
 444                 if (!c)
 445                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 446                                                   Client_ID(Client),
 447                                                   Req->prefix);
 448
 449                 Client_SetUser(c, Req->argv[0], true);
 450                 Client_SetHostname(c, Req->argv[1]);
 451                 Client_SetInfo(c, Req->argv[3]);
 452
 453                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 454                          Client_Conn(Client), Client_Mask(c));
 455
 456                 /* RFC 1459 style user registration?
 457                  * Introduce client to network: */
 458                 if (Client_Type(c) == CLIENT_GOTNICK)
 459                         Introduce_Client(Client, c);
 460
 461                 return CONNECTED;
 462         } else if (Client_Type(Client) == CLIENT_USER) {
 463                 /* Already registered connection */
 464                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 465                                           Client_ID(Client));
 466         } else {
 467                 /* Unexpected/invalid connection state? */
 468                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 469                                           Client_ID(Client));
 470         }
 471 } /* IRC_USER */
 472
 473
 474 /**
 475  * Service registration.
 476  * ngIRCd does not support services at the moment, so this function is a
 477  * dummy that returns ERR_ERRONEUSNICKNAME on each call.
 478  */
 479 GLOBAL bool
 480 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 481 {
 482         assert(Client != NULL);
 483         assert(Req != NULL);
 484
 485         if (Client_Type(Client) != CLIENT_GOTPASS)
 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         return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 494                                   Client_ID(Client), Req->argv[0]);
 495 } /* IRC_SERVICE */
 496
 497
 498 GLOBAL bool
 499 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 500 {
 501         CLIENT *target;
 502         char quitmsg[LINE_LEN];
 503
 504         assert( Client != NULL );
 505         assert( Req != NULL );
 506
 507         /* Wrong number of arguments? */
 508         if( Req->argc > 1 )
 509                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 510
 511         if (Req->argc == 1)
 512                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 513
 514         if ( Client_Type( Client ) == CLIENT_SERVER )
 515         {
 516                 /* Server */
 517                 target = Client_Search( Req->prefix );
 518                 if( ! target )
 519                 {
 520                         /* Den Client kennen wir nicht (mehr), also nichts zu tun. */
 521                         Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
 522                         return CONNECTED;
 523                 }
 524
 525                 Client_Destroy( target, "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 526
 527                 return CONNECTED;
 528         }
 529         else
 530         {
 531                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 532                         /* " " to avoid confusion */
 533                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 534                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 535                         strlcat(quitmsg, "\"", sizeof quitmsg );
 536                 }
 537
 538                 /* User, Service, oder noch nicht registriert */
 539                 Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 540
 541                 return DISCONNECTED;
 542         }
 543 } /* IRC_QUIT */
 544
 545
 546 GLOBAL bool
 547 IRC_PING(CLIENT *Client, REQUEST *Req)
 548 {
 549         CLIENT *target, *from;
 550
 551         assert(Client != NULL);
 552         assert(Req != NULL);
 553
 554         /* Wrong number of arguments? */
 555         if (Req->argc < 1)
 556                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 557                                           Client_ID(Client));
 558 #ifdef STRICT_RFC
 559         /* Don't ignore additional arguments when in "strict" mode */
 560         if (Req->argc > 2)
 561                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 562                                            Client_ID(Client), Req->command);
 563 #endif
 564
 565         if (Req->argc > 1) {
 566                 /* A target has been specified ... */
 567                 target = Client_Search(Req->argv[1]);
 568
 569                 if (!target || Client_Type(target) != CLIENT_SERVER)
 570                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 571                                         Client_ID(Client), Req->argv[1]);
 572
 573                 if (target != Client_ThisServer()) {
 574                         /* Ok, we have to forward the PING */
 575                         if (Client_Type(Client) == CLIENT_SERVER)
 576                                 from = Client_Search(Req->prefix);
 577                         else
 578                                 from = Client;
 579                         if (!from)
 580                                 return IRC_WriteStrClient(Client,
 581                                                 ERR_NOSUCHSERVER_MSG,
 582                                                 Client_ID(Client), Req->prefix);
 583
 584                         return IRC_WriteStrClientPrefix(target, from,
 585                                         "PING %s :%s", Req->argv[0],
 586                                         Req->argv[1] );
 587                 }
 588         }
 589
 590         if (Client_Type(Client) == CLIENT_SERVER) {
 591                 if (Req->prefix)
 592                         from = Client_Search(Req->prefix);
 593                 else
 594                         from = Client;
 595         } else
 596                 from = Client_ThisServer();
 597         if (!from)
 598                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 599                                         Client_ID(Client), Req->prefix);
 600
 601         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 602             Client_Conn(Client));
 603
 604 #ifdef STRICT_RFC
 605         return IRC_WriteStrClient(Client, "PONG %s :%s",
 606                 Client_ID(from), Client_ID(Client));
 607 #else
 608         /* Some clients depend on the argument being returned in the PONG
 609          * reply (not mentioned in any RFC, though) */
 610         return IRC_WriteStrClient(Client, "PONG %s :%s",
 611                 Client_ID(from), Req->argv[0]);
 612 #endif
 613 } /* IRC_PING */
 614
 615
 616 GLOBAL bool
 617 IRC_PONG(CLIENT *Client, REQUEST *Req)
 618 {
 619         CLIENT *target, *from;
 620         char *s;
 621
 622         assert(Client != NULL);
 623         assert(Req != NULL);
 624
 625         /* Wrong number of arguments? */
 626         if (Req->argc < 1)
 627                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 628                                           Client_ID(Client));
 629         if (Req->argc > 2)
 630                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 631                                           Client_ID(Client), Req->command);
 632
 633         /* Forward? */
 634         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 635                 target = Client_Search(Req->argv[0]);
 636                 if (!target)
 637                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 638                                         Client_ID(Client), Req->argv[0]);
 639
 640                 from = Client_Search(Req->prefix);
 641
 642                 if (target != Client_ThisServer() && target != from) {
 643                         /* Ok, we have to forward the message. */
 644                         if (!from)
 645                                 return IRC_WriteStrClient(Client,
 646                                                 ERR_NOSUCHSERVER_MSG,
 647                                                 Client_ID(Client), Req->prefix);
 648
 649                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 650                                 s = Client_ID(from);
 651                         else
 652                                 s = Req->argv[0];
 653                         return IRC_WriteStrClientPrefix(target, from,
 654                                  "PONG %s :%s", s, Req->argv[1]);
 655                 }
 656         }
 657
 658         /* The connection timestamp has already been updated when the data has
 659          * been read from so socket, so we don't need to update it here. */
 660
 661         if (Client_Conn(Client) > NONE)
 662                 Log(LOG_DEBUG,
 663                         "Connection %d: received PONG. Lag: %ld seconds.",
 664                         Client_Conn(Client),
 665                         time(NULL) - Conn_LastPing(Client_Conn(Client)));
 666         else
 667                  Log(LOG_DEBUG,
 668                         "Connection %d: received PONG.", Client_Conn(Client));
 669
 670         return CONNECTED;
 671 } /* IRC_PONG */
 672
 673
 674 static bool
 675 Hello_User(CLIENT * Client)
 676 {
 677         assert(Client != NULL);
 678
 679         /* Check password ... */
 680         if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 681                 /* Bad password! */
 682                 Log(LOG_ERR,
 683                     "User \"%s\" rejected (connection %d): Bad password!",
 684                     Client_Mask(Client), Client_Conn(Client));
 685                 Conn_Close(Client_Conn(Client), NULL, "Bad password", true);
 686                 return DISCONNECTED;
 687         }
 688
 689         Introduce_Client(NULL, Client);
 690
 691         if (!IRC_WriteStrClient
 692             (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
 693                 return false;
 694         if (!IRC_WriteStrClient
 695             (Client, RPL_YOURHOST_MSG, Client_ID(Client),
 696              Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
 697              TARGET_VENDOR, TARGET_OS))
 698                 return false;
 699         if (!IRC_WriteStrClient
 700             (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
 701                 return false;
 702         if (!IRC_WriteStrClient
 703             (Client, RPL_MYINFO_MSG, Client_ID(Client),
 704              Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
 705              CHANMODES))
 706                 return false;
 707
 708         /* Features supported by this server (005 numeric, ISUPPORT),
 709          * see <http://www.irc.org/tech_docs/005.html> for details. */
 710         if (!IRC_Send_ISUPPORT(Client))
 711                 return DISCONNECTED;
 712
 713         if (!IRC_Send_LUSERS(Client))
 714                 return DISCONNECTED;
 715         if (!IRC_Show_MOTD(Client))
 716                 return DISCONNECTED;
 717
 718         /* Suspend the client for a second ... */
 719         IRC_SetPenalty(Client, 1);
 720
 721         return CONNECTED;
 722 } /* Hello_User */
 723
 724
 725 static void
 726 Kill_Nick( char *Nick, char *Reason )
 727 {
 728         REQUEST r;
 729
 730         assert( Nick != NULL );
 731         assert( Reason != NULL );
 732
 733         r.prefix = (char *)Client_ThisServer( );
 734         r.argv[0] = Nick;
 735         r.argv[1] = Reason;
 736         r.argc = 2;
 737
 738         Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
 739         IRC_KILL( Client_ThisServer( ), &r );
 740 } /* Kill_Nick */
 741
 742
 743 static void
 744 Introduce_Client(CLIENT *From, CLIENT *Client)
 745 {
 746         char *type;
 747
 748         Client_SetType(Client, CLIENT_USER);
 749
 750         if (From) {
 751                 if (Conf_IsService(Conf_GetServer(Client_Conn(From)), Client_ID(Client))) {
 752                         type = "Service";
 753                 } else
 754                         type = "User";
 755                 LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
 756                          type, Client_Mask(Client), Client_Modes(Client),
 757                          Client_ID(From), Client_ID(Client_Introducer(Client)),
 758                          Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
 759         } else
 760                 Log(LOG_NOTICE, "User \"%s\" registered (connection %d).",
 761                     Client_Mask(Client), Client_Conn(Client));
 762
 763         /* Inform other servers */
 764         IRC_WriteStrServersPrefixFlag_CB(From,
 765                                 From != NULL ? From : Client_ThisServer(),
 766                                 '\0', cb_introduceClient, (void *)Client);
 767 } /* Introduce_Client */
 768
 769
 770 static void
 771 cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
 772 {
 773         CLIENT *c = (CLIENT *)data;
 774         CONN_ID conn;
 775         char *modes, *user, *host;
 776
 777         modes = Client_Modes(c);
 778         user = Client_User(c) ? Client_User(c) : "-";
 779         host = Client_Hostname(c) ? Client_Hostname(c) : "-";
 780
 781         conn = Client_Conn(To);
 782         if (Conn_Options(conn) & CONN_RFC1459) {
 783                 /* RFC 1459 mode: separate NICK and USER commands */
 784                 Conn_WriteStr(conn, "NICK %s :%d", Client_ID(c),
 785                               Client_Hops(c) + 1);
 786                 Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
 787                               Client_ID(c), user, host,
 788                               Client_ID(Client_Introducer(c)), Client_Info(c));
 789                 if (modes[0])
 790                         Conn_WriteStr(conn, ":%s MODE %s +%s",
 791                                       Client_ID(c), Client_ID(c), modes);
 792         } else {
 793                 /* RFC 2813 mode: one combined NICK command */
 794                 IRC_WriteStrClientPrefix(To, Prefix,
 795                                          "NICK %s %d %s %s %d +%s :%s",
 796                                          Client_ID(c), Client_Hops(c) + 1,
 797                                          user, host,
 798                                          Client_MyToken(Client_Introducer(c)),
 799                                          modes, Client_Info(c));
 800         }
 801 } /* cb_introduceClient */
 802
 803
 804 /* -eof- */