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 typedef struct _INTRO_INFO {
  42         char *nick;             /* Nick name */
  43         int hopcount;           /* Hop count */
  44         char *user;             /* User name */
  45         char *host;             /* Host name */
  46         CLIENT *server;         /* Server the client is connected to */
  47         char *mode;             /* User modes */
  48         char *name;             /* Real name */
  49 } INTRO_INFO;
  50
  51
  52 static bool Hello_User PARAMS(( CLIENT *Client ));
  53 static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
  54 static void Introduce_Client PARAMS((CLIENT *From, char *Nick,
  55                                      const int HopCount, char *User,
  56                                      char *Host, CLIENT *Server,
  57                                      char *Mode, char *Name ));
  58 static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
  59                                        void *i));
  60
  61
  62 /**
  63  * Handler for the IRC command "PASS".
  64  * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
  65  */
  66 GLOBAL bool
  67 IRC_PASS( CLIENT *Client, REQUEST *Req )
  68 {
  69         char *type, *orig_flags;
  70         int protohigh, protolow;
  71
  72         assert( Client != NULL );
  73         assert( Req != NULL );
  74
  75         /* Return an error if this is not a local client */
  76         if (Client_Conn(Client) <= NONE)
  77                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  78                                           Client_ID(Client), Req->command);
  79
  80         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  81                 /* Not yet registered "unknown" connection, PASS with one
  82                  * argument: either a regular client, service, or server
  83                  * using the old RFC 1459 section 4.1.1 syntax. */
  84                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  85                          Client_Conn(Client));
  86         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  87                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  88                    (Req->argc == 3 || Req->argc == 4)) {
  89                 /* Not yet registered "unknown" connection or outgoing server
  90                  * link, PASS with three or four argument: server using the
  91                  * RFC 2813 section 4.1.1 syntax. */
  92                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  93                          Client_Conn(Client));
  94         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  95                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  96                 /* Unregistered connection, but wrong number of arguments: */
  97                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  98                                           Client_ID(Client), Req->command);
  99         } else {
 100                 /* Registered connection, PASS command is not allowed! */
 101                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 102                                           Client_ID(Client));
 103         }
 104
 105         Client_SetPassword(Client, Req->argv[0]);
 106
 107         /* Protocol version */
 108         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
 109                 int c2, c4;
 110
 111                 c2 = Req->argv[1][2];
 112                 c4 = Req->argv[1][4];
 113
 114                 Req->argv[1][4] = '\0';
 115                 protolow = atoi(&Req->argv[1][2]);
 116                 Req->argv[1][2] = '\0';
 117                 protohigh = atoi(Req->argv[1]);
 118
 119                 Req->argv[1][2] = c2;
 120                 Req->argv[1][4] = c4;
 121
 122                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 123         } else {
 124                 protohigh = protolow = 0;
 125                 Client_SetType(Client, CLIENT_GOTPASS);
 126         }
 127
 128         /* Protocol type, see doc/Protocol.txt */
 129         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 130                 type = &Req->argv[1][4];
 131         else
 132                 type = NULL;
 133
 134         /* Protocol flags/options */
 135         if (Req->argc >= 4)
 136                 orig_flags = Req->argv[3];
 137         else
 138                 orig_flags = "";
 139
 140         /* Implementation, version and IRC+ flags */
 141         if (Req->argc >= 3) {
 142                 char *impl, *ptr, *serverver, *flags;
 143
 144                 impl = Req->argv[2];
 145                 ptr = strchr(impl, '|');
 146                 if (ptr)
 147                         *ptr = '\0';
 148
 149                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 150                         /* The peer seems to be a server which supports the
 151                          * IRC+ protocol (see doc/Protocol.txt). */
 152                         serverver = ptr + 1;
 153                         flags = strchr(serverver, ':');
 154                         if (flags) {
 155                                 *flags = '\0';
 156                                 flags++;
 157                         } else
 158                                 flags = "";
 159                         Log(LOG_INFO,
 160                             "Peer announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 161                             impl, serverver, protohigh, protolow, flags);
 162                 } else {
 163                         /* The peer seems to be a server supporting the
 164                          * "original" IRC protocol (RFC 2813). */
 165                         serverver = "";
 166                         if (strchr(orig_flags, 'Z'))
 167                                 flags = "Z";
 168                         else
 169                                 flags = "";
 170                         Log(LOG_INFO,
 171                             "Peer announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 172                             impl, protohigh, protolow, flags);
 173                 }
 174                 Client_SetFlags(Client, flags);
 175         }
 176
 177         return CONNECTED;
 178 } /* IRC_PASS */
 179
 180
 181 /**
 182  * IRC "NICK" command.
 183  * This function implements the IRC command "NICK" which is used to register
 184  * with the server, to change already registered nicknames and to introduce
 185  * new users which are connected to other servers.
 186  */
 187 GLOBAL bool
 188 IRC_NICK( CLIENT *Client, REQUEST *Req )
 189 {
 190         CLIENT *intr_c, *target, *c;
 191         char *nick, *user, *hostname, *modes, *info;
 192         int token, hops;
 193
 194         assert( Client != NULL );
 195         assert( Req != NULL );
 196
 197 #ifndef STRICT_RFC
 198         /* Some IRC clients, for example BitchX, send the NICK and USER
 199          * commands in the wrong order ... */
 200         if( Client_Type( Client ) == CLIENT_UNKNOWN
 201             || Client_Type( Client ) == CLIENT_GOTPASS
 202             || Client_Type( Client ) == CLIENT_GOTNICK
 203             || Client_Type( Client ) == CLIENT_GOTUSER
 204             || Client_Type( Client ) == CLIENT_USER
 205             || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
 206 #else
 207         if( Client_Type( Client ) == CLIENT_UNKNOWN
 208             || Client_Type( Client ) == CLIENT_GOTPASS
 209             || Client_Type( Client ) == CLIENT_GOTNICK
 210             || Client_Type( Client ) == CLIENT_USER
 211             || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
 212 #endif
 213         {
 214                 /* User registration or change of nickname */
 215
 216                 /* Wrong number of arguments? */
 217                 if( Req->argc != 1 )
 218                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 219                                                    Client_ID( Client ),
 220                                                    Req->command );
 221
 222                 /* Search "target" client */
 223                 if( Client_Type( Client ) == CLIENT_SERVER )
 224                 {
 225                         target = Client_Search( Req->prefix );
 226                         if( ! target )
 227                                 return IRC_WriteStrClient( Client,
 228                                                            ERR_NOSUCHNICK_MSG,
 229                                                            Client_ID( Client ),
 230                                                            Req->argv[0] );
 231                 }
 232                 else
 233                 {
 234                         /* Is this a restricted client? */
 235                         if( Client_HasMode( Client, 'r' ))
 236                                 return IRC_WriteStrClient( Client,
 237                                                            ERR_RESTRICTED_MSG,
 238                                                            Client_ID( Client ));
 239
 240                         target = Client;
 241                 }
 242
 243 #ifndef STRICT_RFC
 244                 /* If the clients tries to change to its own nickname we won't
 245                  * do anything. This is how the original ircd behaves and some
 246                  * clients (for example Snak) expect it to be like this.
 247                  * But I doubt that this is "really the right thing" ... */
 248                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 249                         return CONNECTED;
 250 #endif
 251
 252                 /* Check that the new nickname is available. Special case:
 253                  * the client only changes from/to upper to lower case. */
 254                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 255                 {
 256                         if( ! Client_CheckNick( target, Req->argv[0] ))
 257                                 return CONNECTED;
 258                 }
 259
 260                 if(( Client_Type( target ) != CLIENT_USER )
 261                    && ( Client_Type( target ) != CLIENT_SERVER ))
 262                 {
 263                         /* New client */
 264                         Log( LOG_DEBUG, "Connection %d: got valid NICK command ...",
 265                              Client_Conn( Client ));
 266
 267                         /* Register new nickname of this client */
 268                         Client_SetID( target, Req->argv[0] );
 269
 270                         /* If we received a valid USER command already then
 271                          * register the new client! */
 272                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 273                                 return Hello_User( Client );
 274                         else
 275                                 Client_SetType( Client, CLIENT_GOTNICK );
 276                 }
 277                 else
 278                 {
 279                         /* Nickname change */
 280                         if (Client_Conn(target) > NONE) {
 281                                 /* Local client */
 282                                 Log(LOG_INFO,
 283                                     "User \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 284                                     Client_Mask(target), Client_Conn(target),
 285                                     Client_ID(target), Req->argv[0]);
 286                                 Conn_UpdateIdle(Client_Conn(target));
 287                         }
 288                         else
 289                         {
 290                                 /* Remote client */
 291                                 Log( LOG_DEBUG,
 292                                      "User \"%s\" changed nick: \"%s\" -> \"%s\".",
 293                                      Client_Mask( target ), Client_ID( target ),
 294                                      Req->argv[0] );
 295                         }
 296
 297                         /* Inform all users and servers (which have to know)
 298                          * of this nickname change */
 299                         if( Client_Type( Client ) == CLIENT_USER )
 300                                 IRC_WriteStrClientPrefix( Client, Client,
 301                                                           "NICK :%s",
 302                                                           Req->argv[0] );
 303                         IRC_WriteStrServersPrefix( Client, target,
 304                                                    "NICK :%s", Req->argv[0] );
 305                         IRC_WriteStrRelatedPrefix( target, target, false,
 306                                                    "NICK :%s", Req->argv[0] );
 307
 308                         /* Register old nickname for WHOWAS queries */
 309                         Client_RegisterWhowas( target );
 310
 311                         /* Save new nickname */
 312                         Client_SetID( target, Req->argv[0] );
 313
 314                         IRC_SetPenalty( target, 2 );
 315                 }
 316
 317                 return CONNECTED;
 318         } else if(Client_Type(Client) == CLIENT_SERVER ||
 319                   Client_Type(Client) == CLIENT_SERVICE) {
 320                 /* Server or service introduces new client */
 321
 322                 /* Bad number of parameters? */
 323                 if (Req->argc != 2 && Req->argc != 7)
 324                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 325                                                   Client_ID(Client), Req->command);
 326
 327                 if (Req->argc >= 7) {
 328                         /* RFC 2813 compatible syntax */
 329                         nick = Req->argv[0];
 330                         hops = atoi(Req->argv[1]);
 331                         user = Req->argv[2];
 332                         hostname = Req->argv[3];
 333                         token = atoi(Req->argv[4]);
 334                         modes = Req->argv[5] + 1;
 335                         info = Req->argv[6];
 336                 } else {
 337                         /* RFC 1459 compatible syntax */
 338                         nick = Req->argv[0];
 339                         hops = 1;
 340                         user = Req->argv[0];
 341                         hostname = Client_ID(Client);
 342                         token = atoi(Req->argv[1]);
 343                         modes = "";
 344                         info = Req->argv[0];
 345                 }
 346
 347                 /* Nick ueberpruefen */
 348                 c = Client_Search(nick);
 349                 if(c) {
 350                         /* Der neue Nick ist auf diesem Server bereits registriert:
 351                          * sowohl der neue, als auch der alte Client muessen nun
 352                          * disconnectiert werden. */
 353                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 354                         Kill_Nick( Req->argv[0], "Nick collision" );
 355                         return CONNECTED;
 356                 }
 357
 358                 /* Server, zu dem der Client connectiert ist, suchen */
 359                 intr_c = Client_GetFromToken(Client, token);
 360                 if( ! intr_c )
 361                 {
 362                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 363                         Kill_Nick( Req->argv[0], "Unknown server" );
 364                         return CONNECTED;
 365                 }
 366
 367                 /* Neue Client-Struktur anlegen */
 368                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 369                                          token, modes, info, true);
 370                 if( ! c )
 371                 {
 372                         /* Eine neue Client-Struktur konnte nicht angelegt werden.
 373                          * Der Client muss disconnectiert werden, damit der Netz-
 374                          * status konsistent bleibt. */
 375                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 376                         Kill_Nick( Req->argv[0], "Server error" );
 377                         return CONNECTED;
 378                 }
 379
 380                 /* RFC 2813: client is now fully registered, inform all the
 381                  * other servers about the new user.
 382                  * RFC 1459: announce the new client only after receiving the
 383                  * USER command, first we need more information! */
 384                 if (Req->argc >= 7) {
 385                         modes = Client_Modes(c);
 386                         LogDebug("User \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
 387                                 Client_Mask(c), modes, Client_ID(Client),
 388                                 Client_ID(intr_c), Client_Hops(c),
 389                                 Client_Hops(c) > 1 ? "s": "");
 390
 391                         Introduce_Client(Client, Req->argv[0],
 392                                 atoi(Req->argv[1]) + 1, Req->argv[2],
 393                                 Req->argv[3], intr_c, Req->argv[5], Req->argv[6]);
 394                 } else {
 395                         LogDebug("User \"%s\" is beeing registered (RFC 1459) ...",
 396                                  Client_Mask(c));
 397                         Client_SetType(c, CLIENT_GOTNICK);
 398                 }
 399
 400                 return CONNECTED;
 401         }
 402         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 403 } /* IRC_NICK */
 404
 405
 406 /**
 407  * Handler for the IRC command "USER".
 408  */
 409 GLOBAL bool
 410 IRC_USER(CLIENT * Client, REQUEST * Req)
 411 {
 412         CLIENT *c;
 413         char modes[CLIENT_MODE_LEN + 1] = "+";
 414 #ifdef IDENTAUTH
 415         char *ptr;
 416 #endif
 417
 418         assert(Client != NULL);
 419         assert(Req != NULL);
 420
 421         if (Client_Type(Client) == CLIENT_GOTNICK ||
 422 #ifndef STRICT_RFC
 423             Client_Type(Client) == CLIENT_UNKNOWN ||
 424 #endif
 425             Client_Type(Client) == CLIENT_GOTPASS)
 426         {
 427                 /* New connection */
 428                 if (Req->argc != 4)
 429                         return IRC_WriteStrClient(Client,
 430                                                   ERR_NEEDMOREPARAMS_MSG,
 431                                                   Client_ID(Client),
 432                                                   Req->command);
 433
 434                 /* User name */
 435 #ifdef IDENTAUTH
 436                 ptr = Client_User(Client);
 437                 if (!ptr || !*ptr || *ptr == '~')
 438                         Client_SetUser(Client, Req->argv[0], false);
 439 #else
 440                 Client_SetUser(Client, Req->argv[0], false);
 441 #endif
 442
 443                 /* "Real name" or user info text: Don't set it to the empty
 444                  * string, the original ircd can't deal with such "real names"
 445                  * (e. g. "USER user * * :") ... */
 446                 if (*Req->argv[3])
 447                         Client_SetInfo(Client, Req->argv[3]);
 448                 else
 449                         Client_SetInfo(Client, "-");
 450
 451                 LogDebug("Connection %d: got valid USER command ...",
 452                     Client_Conn(Client));
 453                 if (Client_Type(Client) == CLIENT_GOTNICK)
 454                         return Hello_User(Client);
 455                 else
 456                         Client_SetType(Client, CLIENT_GOTUSER);
 457                 return CONNECTED;
 458
 459         } else if (Client_Type(Client) == CLIENT_SERVER ||
 460                    Client_Type(Client) == CLIENT_SERVICE) {
 461                 /* Server/service updating an user */
 462                 if (Req->argc != 4)
 463                         return IRC_WriteStrClient(Client,
 464                                                   ERR_NEEDMOREPARAMS_MSG,
 465                                                   Client_ID(Client),
 466                                                   Req->command);
 467                 c = Client_Search(Req->prefix);
 468                 if (!c)
 469                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 470                                                   Client_ID(Client),
 471                                                   Req->prefix);
 472
 473                 Client_SetUser(c, Req->argv[0], true);
 474                 Client_SetHostname(c, Req->argv[1]);
 475                 Client_SetInfo(c, Req->argv[3]);
 476
 477                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 478                          Client_Conn(Client), Client_Mask(c));
 479
 480                 /* RFC 1459 style user registration? Inform other servers! */
 481                 if (Client_Type(c) == CLIENT_GOTNICK) {
 482                         strlcat(modes, Client_Modes(c), sizeof(modes));
 483                         Introduce_Client(Client, Client_ID(c), Client_Hops(c),
 484                                          Client_User(c), Client_Hostname(c),
 485                                          Client_Introducer(c), modes,
 486                                          Client_Info(c));
 487                         LogDebug("User \"%s\" (%s) registered (via %s, on %s, %d hop%s).",
 488                                  Client_Mask(c), modes, Client_ID(Client),
 489                                  Client_ID(Client_Introducer(c)), Client_Hops(c),
 490                                  Client_Hops(c) > 1 ? "s": "");
 491                         Client_SetType(c, CLIENT_USER);
 492                 }
 493
 494                 return CONNECTED;
 495         } else if (Client_Type(Client) == CLIENT_USER) {
 496                 /* Already registered connection */
 497                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 498                                           Client_ID(Client));
 499         } else {
 500                 /* Unexpected/invalid connection state? */
 501                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 502                                           Client_ID(Client));
 503         }
 504 } /* IRC_USER */
 505
 506
 507 /**
 508  * Service registration.
 509  * ngIRCd does not support services at the moment, so this function is a
 510  * dummy that returns ERR_ERRONEUSNICKNAME on each call.
 511  */
 512 GLOBAL bool
 513 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 514 {
 515         assert(Client != NULL);
 516         assert(Req != NULL);
 517
 518         if (Client_Type(Client) != CLIENT_GOTPASS)
 519                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 520                                           Client_ID(Client));
 521
 522         if (Req->argc != 6)
 523                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 524                                           Client_ID(Client), Req->command);
 525
 526         return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 527                                   Client_ID(Client), Req->argv[0]);
 528 } /* IRC_SERVICE */
 529
 530
 531 GLOBAL bool
 532 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 533 {
 534         CLIENT *target;
 535         char quitmsg[LINE_LEN];
 536
 537         assert( Client != NULL );
 538         assert( Req != NULL );
 539
 540         /* Wrong number of arguments? */
 541         if( Req->argc > 1 )
 542                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 543
 544         if (Req->argc == 1)
 545                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 546
 547         if ( Client_Type( Client ) == CLIENT_SERVER )
 548         {
 549                 /* Server */
 550                 target = Client_Search( Req->prefix );
 551                 if( ! target )
 552                 {
 553                         /* Den Client kennen wir nicht (mehr), also nichts zu tun. */
 554                         Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
 555                         return CONNECTED;
 556                 }
 557
 558                 Client_Destroy( target, "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 559
 560                 return CONNECTED;
 561         }
 562         else
 563         {
 564                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 565                         /* " " to avoid confusion */
 566                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 567                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 568                         strlcat(quitmsg, "\"", sizeof quitmsg );
 569                 }
 570
 571                 /* User, Service, oder noch nicht registriert */
 572                 Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 573
 574                 return DISCONNECTED;
 575         }
 576 } /* IRC_QUIT */
 577
 578
 579 GLOBAL bool
 580 IRC_PING(CLIENT *Client, REQUEST *Req)
 581 {
 582         CLIENT *target, *from;
 583
 584         assert(Client != NULL);
 585         assert(Req != NULL);
 586
 587         /* Wrong number of arguments? */
 588         if (Req->argc < 1)
 589                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 590                                           Client_ID(Client));
 591 #ifdef STRICT_RFC
 592         /* Don't ignore additional arguments when in "strict" mode */
 593         if (Req->argc > 2)
 594                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 595                                            Client_ID(Client), Req->command);
 596 #endif
 597
 598         if (Req->argc > 1) {
 599                 /* A target has been specified ... */
 600                 target = Client_Search(Req->argv[1]);
 601
 602                 if (!target || Client_Type(target) != CLIENT_SERVER)
 603                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 604                                         Client_ID(Client), Req->argv[1]);
 605
 606                 if (target != Client_ThisServer()) {
 607                         /* Ok, we have to forward the PING */
 608                         if (Client_Type(Client) == CLIENT_SERVER)
 609                                 from = Client_Search(Req->prefix);
 610                         else
 611                                 from = Client;
 612                         if (!from)
 613                                 return IRC_WriteStrClient(Client,
 614                                                 ERR_NOSUCHSERVER_MSG,
 615                                                 Client_ID(Client), Req->prefix);
 616
 617                         return IRC_WriteStrClientPrefix(target, from,
 618                                         "PING %s :%s", Req->argv[0],
 619                                         Req->argv[1] );
 620                 }
 621         }
 622
 623         if (Client_Type(Client) == CLIENT_SERVER) {
 624                 if (Req->prefix)
 625                         from = Client_Search(Req->prefix);
 626                 else
 627                         from = Client;
 628         } else
 629                 from = Client_ThisServer();
 630         if (!from)
 631                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 632                                         Client_ID(Client), Req->prefix);
 633
 634         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 635             Client_Conn(Client));
 636
 637 #ifdef STRICT_RFC
 638         return IRC_WriteStrClient(Client, "PONG %s :%s",
 639                 Client_ID(from), Client_ID(Client));
 640 #else
 641         /* Some clients depend on the argument being returned in the PONG
 642          * reply (not mentioned in any RFC, though) */
 643         return IRC_WriteStrClient(Client, "PONG %s :%s",
 644                 Client_ID(from), Req->argv[0]);
 645 #endif
 646 } /* IRC_PING */
 647
 648
 649 GLOBAL bool
 650 IRC_PONG(CLIENT *Client, REQUEST *Req)
 651 {
 652         CLIENT *target, *from;
 653         char *s;
 654
 655         assert(Client != NULL);
 656         assert(Req != NULL);
 657
 658         /* Wrong number of arguments? */
 659         if (Req->argc < 1)
 660                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 661                                           Client_ID(Client));
 662         if (Req->argc > 2)
 663                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 664                                           Client_ID(Client), Req->command);
 665
 666         /* Forward? */
 667         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 668                 target = Client_Search(Req->argv[0]);
 669                 if (!target)
 670                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 671                                         Client_ID(Client), Req->argv[0]);
 672
 673                 from = Client_Search(Req->prefix);
 674
 675                 if (target != Client_ThisServer() && target != from) {
 676                         /* Ok, we have to forward the message. */
 677                         if (!from)
 678                                 return IRC_WriteStrClient(Client,
 679                                                 ERR_NOSUCHSERVER_MSG,
 680                                                 Client_ID(Client), Req->prefix);
 681
 682                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 683                                 s = Client_ID(from);
 684                         else
 685                                 s = Req->argv[0];
 686                         return IRC_WriteStrClientPrefix(target, from,
 687                                  "PONG %s :%s", s, Req->argv[1]);
 688                 }
 689         }
 690
 691         /* The connection timestamp has already been updated when the data has
 692          * been read from so socket, so we don't need to update it here. */
 693
 694         if (Client_Conn(Client) > NONE)
 695                 Log(LOG_DEBUG,
 696                         "Connection %d: received PONG. Lag: %ld seconds.",
 697                         Client_Conn(Client),
 698                         time(NULL) - Conn_LastPing(Client_Conn(Client)));
 699         else
 700                  Log(LOG_DEBUG,
 701                         "Connection %d: received PONG.", Client_Conn(Client));
 702
 703         return CONNECTED;
 704 } /* IRC_PONG */
 705
 706
 707 static bool
 708 Hello_User(CLIENT * Client)
 709 {
 710         char modes[CLIENT_MODE_LEN + 1] = "+";
 711
 712         assert(Client != NULL);
 713
 714         /* Check password ... */
 715         if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 716                 /* Bad password! */
 717                 Log(LOG_ERR,
 718                     "User \"%s\" rejected (connection %d): Bad password!",
 719                     Client_Mask(Client), Client_Conn(Client));
 720                 Conn_Close(Client_Conn(Client), NULL, "Bad password", true);
 721                 return DISCONNECTED;
 722         }
 723
 724         Log(LOG_NOTICE, "User \"%s\" registered (connection %d).",
 725             Client_Mask(Client), Client_Conn(Client));
 726
 727         /* Inform other servers */
 728         strlcat(modes, Client_Modes(Client), sizeof(modes));
 729         Introduce_Client(NULL, Client_ID(Client), 1, Client_User(Client),
 730                          Client_Hostname(Client), NULL, modes,
 731                          Client_Info(Client));
 732
 733         if (!IRC_WriteStrClient
 734             (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
 735                 return false;
 736         if (!IRC_WriteStrClient
 737             (Client, RPL_YOURHOST_MSG, Client_ID(Client),
 738              Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
 739              TARGET_VENDOR, TARGET_OS))
 740                 return false;
 741         if (!IRC_WriteStrClient
 742             (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
 743                 return false;
 744         if (!IRC_WriteStrClient
 745             (Client, RPL_MYINFO_MSG, Client_ID(Client),
 746              Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
 747              CHANMODES))
 748                 return false;
 749
 750         /* Features supported by this server (005 numeric, ISUPPORT),
 751          * see <http://www.irc.org/tech_docs/005.html> for details. */
 752         if (!IRC_Send_ISUPPORT(Client))
 753                 return DISCONNECTED;
 754
 755         Client_SetType(Client, CLIENT_USER);
 756
 757         if (!IRC_Send_LUSERS(Client))
 758                 return DISCONNECTED;
 759         if (!IRC_Show_MOTD(Client))
 760                 return DISCONNECTED;
 761
 762         /* Suspend the client for a second ... */
 763         IRC_SetPenalty(Client, 1);
 764
 765         return CONNECTED;
 766 } /* Hello_User */
 767
 768
 769 static void
 770 Kill_Nick( char *Nick, char *Reason )
 771 {
 772         REQUEST r;
 773
 774         assert( Nick != NULL );
 775         assert( Reason != NULL );
 776
 777         r.prefix = (char *)Client_ThisServer( );
 778         r.argv[0] = Nick;
 779         r.argv[1] = Reason;
 780         r.argc = 2;
 781
 782         Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
 783         IRC_KILL( Client_ThisServer( ), &r );
 784 } /* Kill_Nick */
 785
 786
 787 static void
 788 Introduce_Client(CLIENT *From, char *Nick, const int HopCount, char *User,
 789                  char *Host, CLIENT *Server, char *Mode, char *Name)
 790 {
 791         INTRO_INFO i;
 792
 793         i.nick = Nick;
 794         i.hopcount = HopCount;
 795         i.user = User ? User : "-";
 796         i.host = Host ? Host : "-";
 797         i.server = Server ? Server : Client_ThisServer();
 798         i.mode = Mode ? Mode : "+";
 799         i.name = Name ? Name : "";
 800
 801         IRC_WriteStrServersPrefixFlag_CB(From,
 802                                 From != NULL ? From : Client_ThisServer(),
 803                                 '\0', cb_introduceClient, (void *)(&i));
 804 } /* Introduce_Client */
 805
 806
 807 static void
 808 cb_introduceClient(CLIENT *Client, CLIENT *Prefix, void *data)
 809 {
 810         INTRO_INFO *i = (INTRO_INFO *)data;
 811         CONN_ID conn;
 812
 813         conn = Client_Conn(Client);
 814         if (Conn_Options(conn) & CONN_RFC1459) {
 815                 /* RFC 1459 mode: separate NICK and USER commands */
 816                 Conn_WriteStr(conn, "NICK %s :%d", i->nick, i->hopcount);
 817                 Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
 818                               i->nick, i->user, i->host,
 819                               Client_ID(i->server), i->name);
 820         } else {
 821                 /* RFC 2813 mode: one combined NICK command */
 822                 IRC_WriteStrClientPrefix(Client, Prefix,
 823                                          "NICK %s %d %s %s %d %s :%s",
 824                                          i->nick, i->hopcount, i->user, i->host,
 825                                          Client_MyToken(i->server), i->mode,
 826                                          i->name);
 827         }
 828 } /* cb_introduceClient */
 829
 830
 831 /* -eof- */