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                         if (strchr(orig_flags, 'Z'))
 152                                 flags = "Z";
 153                         else
 154                                 flags = "";
 155                         Log(LOG_INFO,
 156                             "Peer announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 157                             impl, protohigh, protolow, flags);
 158                 }
 159                 Client_SetFlags(Client, flags);
 160         }
 161
 162         return CONNECTED;
 163 } /* IRC_PASS */
 164
 165
 166 /**
 167  * IRC "NICK" command.
 168  * This function implements the IRC command "NICK" which is used to register
 169  * with the server, to change already registered nicknames and to introduce
 170  * new users which are connected to other servers.
 171  */
 172 GLOBAL bool
 173 IRC_NICK( CLIENT *Client, REQUEST *Req )
 174 {
 175         CLIENT *intr_c, *target, *c;
 176         char *nick, *user, *hostname, *modes, *info;
 177         int token, hops;
 178
 179         assert( Client != NULL );
 180         assert( Req != NULL );
 181
 182         /* Some IRC clients, for example BitchX, send the NICK and USER
 183          * commands in the wrong order ... */
 184         if(Client_Type(Client) == CLIENT_UNKNOWN
 185             || Client_Type(Client) == CLIENT_GOTPASS
 186             || Client_Type(Client) == CLIENT_GOTNICK
 187 #ifndef STRICT_RFC
 188             || Client_Type(Client) == CLIENT_GOTUSER
 189 #endif
 190             || Client_Type(Client) == CLIENT_USER
 191             || Client_Type(Client) == CLIENT_SERVICE
 192             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 193         {
 194                 /* User registration or change of nickname */
 195
 196                 /* Wrong number of arguments? */
 197                 if( Req->argc != 1 )
 198                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 199                                                    Client_ID( Client ),
 200                                                    Req->command );
 201
 202                 /* Search "target" client */
 203                 if( Client_Type( Client ) == CLIENT_SERVER )
 204                 {
 205                         target = Client_Search( Req->prefix );
 206                         if( ! target )
 207                                 return IRC_WriteStrClient( Client,
 208                                                            ERR_NOSUCHNICK_MSG,
 209                                                            Client_ID( Client ),
 210                                                            Req->argv[0] );
 211                 }
 212                 else
 213                 {
 214                         /* Is this a restricted client? */
 215                         if( Client_HasMode( Client, 'r' ))
 216                                 return IRC_WriteStrClient( Client,
 217                                                            ERR_RESTRICTED_MSG,
 218                                                            Client_ID( Client ));
 219
 220                         target = Client;
 221                 }
 222
 223 #ifndef STRICT_RFC
 224                 /* If the clients tries to change to its own nickname we won't
 225                  * do anything. This is how the original ircd behaves and some
 226                  * clients (for example Snak) expect it to be like this.
 227                  * But I doubt that this is "really the right thing" ... */
 228                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 229                         return CONNECTED;
 230 #endif
 231
 232                 /* Check that the new nickname is available. Special case:
 233                  * the client only changes from/to upper to lower case. */
 234                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 235                 {
 236                         if( ! Client_CheckNick( target, Req->argv[0] ))
 237                                 return CONNECTED;
 238                 }
 239
 240                 if (Client_Type(target) != CLIENT_USER &&
 241                     Client_Type(target) != CLIENT_SERVICE &&
 242                     Client_Type(target) != CLIENT_SERVER) {
 243                         /* New client */
 244                         LogDebug("Connection %d: got valid NICK command ...",
 245                              Client_Conn( Client ));
 246
 247                         /* Register new nickname of this client */
 248                         Client_SetID( target, Req->argv[0] );
 249
 250                         /* If we received a valid USER command already then
 251                          * register the new client! */
 252                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 253                                 return Hello_User( Client );
 254                         else
 255                                 Client_SetType( Client, CLIENT_GOTNICK );
 256                 } else {
 257                         /* Nickname change */
 258                         if (Client_Conn(target) > NONE) {
 259                                 /* Local client */
 260                                 Log(LOG_INFO,
 261                                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 262                                     Client_TypeText(target), Client_Mask(target),
 263                                     Client_Conn(target), Client_ID(target),
 264                                     Req->argv[0]);
 265                                 Conn_UpdateIdle(Client_Conn(target));
 266                         } else {
 267                                 /* Remote client */
 268                                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 269                                          Client_TypeText(target),
 270                                          Client_Mask(target), Client_ID(target),
 271                                          Req->argv[0]);
 272                         }
 273
 274                         /* Inform all users and servers (which have to know)
 275                          * of this nickname change */
 276                         if( Client_Type( Client ) == CLIENT_USER )
 277                                 IRC_WriteStrClientPrefix( Client, Client,
 278                                                           "NICK :%s",
 279                                                           Req->argv[0] );
 280                         IRC_WriteStrServersPrefix( Client, target,
 281                                                    "NICK :%s", Req->argv[0] );
 282                         IRC_WriteStrRelatedPrefix( target, target, false,
 283                                                    "NICK :%s", Req->argv[0] );
 284
 285                         /* Register old nickname for WHOWAS queries */
 286                         Client_RegisterWhowas( target );
 287
 288                         /* Save new nickname */
 289                         Client_SetID( target, Req->argv[0] );
 290
 291                         IRC_SetPenalty( target, 2 );
 292                 }
 293
 294                 return CONNECTED;
 295         } else if(Client_Type(Client) == CLIENT_SERVER ||
 296                   Client_Type(Client) == CLIENT_SERVICE) {
 297                 /* Server or service introduces new client */
 298
 299                 /* Bad number of parameters? */
 300                 if (Req->argc != 2 && Req->argc != 7)
 301                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 302                                                   Client_ID(Client), Req->command);
 303
 304                 if (Req->argc >= 7) {
 305                         /* RFC 2813 compatible syntax */
 306                         nick = Req->argv[0];
 307                         hops = atoi(Req->argv[1]);
 308                         user = Req->argv[2];
 309                         hostname = Req->argv[3];
 310                         token = atoi(Req->argv[4]);
 311                         modes = Req->argv[5] + 1;
 312                         info = Req->argv[6];
 313                 } else {
 314                         /* RFC 1459 compatible syntax */
 315                         nick = Req->argv[0];
 316                         hops = 1;
 317                         user = Req->argv[0];
 318                         hostname = Client_ID(Client);
 319                         token = atoi(Req->argv[1]);
 320                         modes = "";
 321                         info = Req->argv[0];
 322                 }
 323
 324                 c = Client_Search(nick);
 325                 if(c) {
 326                         /*
 327                          * the new nick is already present on this server:
 328                          * the new and the old one have to be disconnected now.
 329                          */
 330                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 331                         Kill_Nick( Req->argv[0], "Nick collision" );
 332                         return CONNECTED;
 333                 }
 334
 335                 /* Find the Server this client is connected to */
 336                 intr_c = Client_GetFromToken(Client, token);
 337                 if( ! intr_c )
 338                 {
 339                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 340                         Kill_Nick( Req->argv[0], "Unknown server" );
 341                         return CONNECTED;
 342                 }
 343
 344                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 345                                          token, modes, info, true);
 346                 if( ! c )
 347                 {
 348                         /* out of memory, need to disconnect client to keep network state consistent */
 349                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 350                         Kill_Nick( Req->argv[0], "Server error" );
 351                         return CONNECTED;
 352                 }
 353
 354                 /* RFC 2813: client is now fully registered, inform all the
 355                  * other servers about the new user.
 356                  * RFC 1459: announce the new client only after receiving the
 357                  * USER command, first we need more information! */
 358                 if (Req->argc < 7) {
 359                         LogDebug("Client \"%s\" is beeing registered (RFC 1459) ...",
 360                                  Client_Mask(c));
 361                         Client_SetType(c, CLIENT_GOTNICK);
 362                 } else
 363                         Introduce_Client(Client, c, CLIENT_USER);
 364
 365                 return CONNECTED;
 366         }
 367         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 368 } /* IRC_NICK */
 369
 370
 371 /**
 372  * Handler for the IRC command "USER".
 373  */
 374 GLOBAL bool
 375 IRC_USER(CLIENT * Client, REQUEST * Req)
 376 {
 377         CLIENT *c;
 378 #ifdef IDENTAUTH
 379         char *ptr;
 380 #endif
 381
 382         assert(Client != NULL);
 383         assert(Req != NULL);
 384
 385         if (Client_Type(Client) == CLIENT_GOTNICK ||
 386 #ifndef STRICT_RFC
 387             Client_Type(Client) == CLIENT_UNKNOWN ||
 388 #endif
 389             Client_Type(Client) == CLIENT_GOTPASS)
 390         {
 391                 /* New connection */
 392                 if (Req->argc != 4)
 393                         return IRC_WriteStrClient(Client,
 394                                                   ERR_NEEDMOREPARAMS_MSG,
 395                                                   Client_ID(Client),
 396                                                   Req->command);
 397
 398                 /* User name */
 399 #ifdef IDENTAUTH
 400                 ptr = Client_User(Client);
 401                 if (!ptr || !*ptr || *ptr == '~')
 402                         Client_SetUser(Client, Req->argv[0], false);
 403 #else
 404                 Client_SetUser(Client, Req->argv[0], false);
 405 #endif
 406
 407                 /* "Real name" or user info text: Don't set it to the empty
 408                  * string, the original ircd can't deal with such "real names"
 409                  * (e. g. "USER user * * :") ... */
 410                 if (*Req->argv[3])
 411                         Client_SetInfo(Client, Req->argv[3]);
 412                 else
 413                         Client_SetInfo(Client, "-");
 414
 415                 LogDebug("Connection %d: got valid USER command ...",
 416                     Client_Conn(Client));
 417                 if (Client_Type(Client) == CLIENT_GOTNICK)
 418                         return Hello_User(Client);
 419                 else
 420                         Client_SetType(Client, CLIENT_GOTUSER);
 421                 return CONNECTED;
 422
 423         } else if (Client_Type(Client) == CLIENT_SERVER ||
 424                    Client_Type(Client) == CLIENT_SERVICE) {
 425                 /* Server/service updating an user */
 426                 if (Req->argc != 4)
 427                         return IRC_WriteStrClient(Client,
 428                                                   ERR_NEEDMOREPARAMS_MSG,
 429                                                   Client_ID(Client),
 430                                                   Req->command);
 431                 c = Client_Search(Req->prefix);
 432                 if (!c)
 433                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 434                                                   Client_ID(Client),
 435                                                   Req->prefix);
 436
 437                 Client_SetUser(c, Req->argv[0], true);
 438                 Client_SetHostname(c, Req->argv[1]);
 439                 Client_SetInfo(c, Req->argv[3]);
 440
 441                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 442                          Client_Conn(Client), Client_Mask(c));
 443
 444                 /* RFC 1459 style user registration?
 445                  * Introduce client to network: */
 446                 if (Client_Type(c) == CLIENT_GOTNICK)
 447                         Introduce_Client(Client, c, CLIENT_USER);
 448
 449                 return CONNECTED;
 450         } else if (Client_Type(Client) == CLIENT_USER) {
 451                 /* Already registered connection */
 452                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 453                                           Client_ID(Client));
 454         } else {
 455                 /* Unexpected/invalid connection state? */
 456                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 457                                           Client_ID(Client));
 458         }
 459 } /* IRC_USER */
 460
 461
 462 /**
 463  * Handler for the IRC command "SERVICE".
 464  * This function implements IRC Services registration using the SERVICE command
 465  * defined in RFC 2812 3.1.6 and RFC 2813 4.1.4.
 466  * At the moment ngIRCd doesn't support directly linked services, so this
 467  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 468  * received from a peer server.
 469  */
 470 GLOBAL bool
 471 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 472 {
 473         CLIENT *c, *intr_c;
 474         char *nick, *user, *host, *info, *modes, *ptr;
 475         int token, hops;
 476
 477         assert(Client != NULL);
 478         assert(Req != NULL);
 479
 480         if (Client_Type(Client) != CLIENT_GOTPASS &&
 481             Client_Type(Client) != CLIENT_SERVER)
 482                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 483                                           Client_ID(Client));
 484
 485         if (Req->argc != 6)
 486                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 487                                           Client_ID(Client), Req->command);
 488
 489         if (Client_Type(Client) != CLIENT_SERVER)
 490                 return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 491                                   Client_ID(Client), Req->argv[0]);
 492
 493         /* Bad number of parameters? */
 494         if (Req->argc != 6)
 495                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 496                                           Client_ID(Client), Req->command);
 497
 498         nick = Req->argv[0];
 499         user = NULL; host = NULL;
 500         token = atoi(Req->argv[1]);
 501         hops = atoi(Req->argv[4]);
 502         info = Req->argv[5];
 503
 504         /* Validate service name ("nick name") */
 505         c = Client_Search(nick);
 506         if(c) {
 507                 /* Nick name collission: disconnect (KILL) both clients! */
 508                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 509                     Client_ID(Client), nick);
 510                 Kill_Nick(nick, "Nick collision");
 511                 return CONNECTED;
 512         }
 513
 514         /* Get the server to which the service is connected */
 515         intr_c = Client_GetFromToken(Client, token);
 516         if (! intr_c) {
 517                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 518                     Client_ID(Client), nick);
 519                 Kill_Nick(nick, "Unknown server");
 520                 return CONNECTED;
 521         }
 522
 523         /* Get user and host name */
 524         ptr = strchr(nick, '@');
 525         if (ptr) {
 526                 *ptr = '\0';
 527                 host = ++ptr;
 528         }
 529         if (!host)
 530                 host = Client_Hostname(intr_c);
 531         ptr = strchr(nick, '!');
 532         if (ptr) {
 533                 *ptr = '\0';
 534                 user = ++ptr;
 535         }
 536         if (!user)
 537                 user = nick;
 538
 539         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 540          * for future usage"; but we use it to transfer the modes and check
 541          * that the first character is a '+' sign and ignore it otherwise. */
 542         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 543
 544         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 545                                  token, modes, info, true);
 546         if (! c) {
 547                 /* Couldn't create client structure, so KILL the service to
 548                  * keep network status consistent ... */
 549                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 550                     Client_Conn(Client));
 551                 Kill_Nick(nick, "Server error");
 552                 return CONNECTED;
 553         }
 554
 555         Introduce_Client(Client, c, CLIENT_SERVICE);
 556         return CONNECTED;
 557 } /* IRC_SERVICE */
 558
 559
 560 GLOBAL bool
 561 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 562 {
 563         CLIENT *target;
 564         char quitmsg[LINE_LEN];
 565
 566         assert( Client != NULL );
 567         assert( Req != NULL );
 568
 569         /* Wrong number of arguments? */
 570         if( Req->argc > 1 )
 571                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 572
 573         if (Req->argc == 1)
 574                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 575
 576         if ( Client_Type( Client ) == CLIENT_SERVER )
 577         {
 578                 /* Server */
 579                 target = Client_Search( Req->prefix );
 580                 if( ! target )
 581                 {
 582                         Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
 583                         return CONNECTED;
 584                 }
 585
 586                 Client_Destroy( target, "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 587
 588                 return CONNECTED;
 589         }
 590         else
 591         {
 592                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 593                         /* " " to avoid confusion */
 594                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 595                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 596                         strlcat(quitmsg, "\"", sizeof quitmsg );
 597                 }
 598
 599                 /* User, Service, or not yet registered */
 600                 Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argc == 1 ? quitmsg : NULL, true);
 601
 602                 return DISCONNECTED;
 603         }
 604 } /* IRC_QUIT */
 605
 606
 607 GLOBAL bool
 608 IRC_PING(CLIENT *Client, REQUEST *Req)
 609 {
 610         CLIENT *target, *from;
 611
 612         assert(Client != NULL);
 613         assert(Req != NULL);
 614
 615         if (Req->argc < 1)
 616                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 617                                           Client_ID(Client));
 618 #ifdef STRICT_RFC
 619         /* Don't ignore additional arguments when in "strict" mode */
 620         if (Req->argc > 2)
 621                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 622                                            Client_ID(Client), Req->command);
 623 #endif
 624
 625         if (Req->argc > 1) {
 626                 /* A target has been specified ... */
 627                 target = Client_Search(Req->argv[1]);
 628
 629                 if (!target || Client_Type(target) != CLIENT_SERVER)
 630                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 631                                         Client_ID(Client), Req->argv[1]);
 632
 633                 if (target != Client_ThisServer()) {
 634                         /* Ok, we have to forward the PING */
 635                         if (Client_Type(Client) == CLIENT_SERVER)
 636                                 from = Client_Search(Req->prefix);
 637                         else
 638                                 from = Client;
 639                         if (!from)
 640                                 return IRC_WriteStrClient(Client,
 641                                                 ERR_NOSUCHSERVER_MSG,
 642                                                 Client_ID(Client), Req->prefix);
 643
 644                         return IRC_WriteStrClientPrefix(target, from,
 645                                         "PING %s :%s", Req->argv[0],
 646                                         Req->argv[1] );
 647                 }
 648         }
 649
 650         if (Client_Type(Client) == CLIENT_SERVER) {
 651                 if (Req->prefix)
 652                         from = Client_Search(Req->prefix);
 653                 else
 654                         from = Client;
 655         } else
 656                 from = Client_ThisServer();
 657         if (!from)
 658                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 659                                         Client_ID(Client), Req->prefix);
 660
 661         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 662             Client_Conn(Client));
 663
 664 #ifdef STRICT_RFC
 665         return IRC_WriteStrClient(Client, "PONG %s :%s",
 666                 Client_ID(from), Client_ID(Client));
 667 #else
 668         /* Some clients depend on the argument being returned in the PONG
 669          * reply (not mentioned in any RFC, though) */
 670         return IRC_WriteStrClient(Client, "PONG %s :%s",
 671                 Client_ID(from), Req->argv[0]);
 672 #endif
 673 } /* IRC_PING */
 674
 675
 676 GLOBAL bool
 677 IRC_PONG(CLIENT *Client, REQUEST *Req)
 678 {
 679         CLIENT *target, *from;
 680         char *s;
 681
 682         assert(Client != NULL);
 683         assert(Req != NULL);
 684
 685         /* Wrong number of arguments? */
 686         if (Req->argc < 1)
 687                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 688                                           Client_ID(Client));
 689         if (Req->argc > 2)
 690                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 691                                           Client_ID(Client), Req->command);
 692
 693         /* Forward? */
 694         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 695                 target = Client_Search(Req->argv[0]);
 696                 if (!target)
 697                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 698                                         Client_ID(Client), Req->argv[0]);
 699
 700                 from = Client_Search(Req->prefix);
 701
 702                 if (target != Client_ThisServer() && target != from) {
 703                         /* Ok, we have to forward the message. */
 704                         if (!from)
 705                                 return IRC_WriteStrClient(Client,
 706                                                 ERR_NOSUCHSERVER_MSG,
 707                                                 Client_ID(Client), Req->prefix);
 708
 709                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 710                                 s = Client_ID(from);
 711                         else
 712                                 s = Req->argv[0];
 713                         return IRC_WriteStrClientPrefix(target, from,
 714                                  "PONG %s :%s", s, Req->argv[1]);
 715                 }
 716         }
 717
 718         /* The connection timestamp has already been updated when the data has
 719          * been read from so socket, so we don't need to update it here. */
 720 #ifdef DEBUG
 721         if (Client_Conn(Client) > NONE)
 722                 Log(LOG_DEBUG,
 723                         "Connection %d: received PONG. Lag: %ld seconds.",
 724                         Client_Conn(Client),
 725                         time(NULL) - Conn_LastPing(Client_Conn(Client)));
 726         else
 727                  Log(LOG_DEBUG,
 728                         "Connection %d: received PONG.", Client_Conn(Client));
 729 #endif
 730         return CONNECTED;
 731 } /* IRC_PONG */
 732
 733
 734 static bool
 735 Hello_User(CLIENT * Client)
 736 {
 737         assert(Client != NULL);
 738
 739         /* Check password ... */
 740         if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 741                 /* Bad password! */
 742                 Log(LOG_ERR,
 743                     "Client \"%s\" rejected (connection %d): Bad password!",
 744                     Client_Mask(Client), Client_Conn(Client));
 745                 Conn_Close(Client_Conn(Client), NULL, "Bad password", true);
 746                 return DISCONNECTED;
 747         }
 748
 749         Introduce_Client(NULL, Client, CLIENT_USER);
 750
 751         if (!IRC_WriteStrClient
 752             (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
 753                 return false;
 754         if (!IRC_WriteStrClient
 755             (Client, RPL_YOURHOST_MSG, Client_ID(Client),
 756              Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
 757              TARGET_VENDOR, TARGET_OS))
 758                 return false;
 759         if (!IRC_WriteStrClient
 760             (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
 761                 return false;
 762         if (!IRC_WriteStrClient
 763             (Client, RPL_MYINFO_MSG, Client_ID(Client),
 764              Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
 765              CHANMODES))
 766                 return false;
 767
 768         /* Features supported by this server (005 numeric, ISUPPORT),
 769          * see <http://www.irc.org/tech_docs/005.html> for details. */
 770         if (!IRC_Send_ISUPPORT(Client))
 771                 return DISCONNECTED;
 772
 773         if (!IRC_Send_LUSERS(Client))
 774                 return DISCONNECTED;
 775         if (!IRC_Show_MOTD(Client))
 776                 return DISCONNECTED;
 777
 778         /* Suspend the client for a second ... */
 779         IRC_SetPenalty(Client, 1);
 780
 781         return CONNECTED;
 782 } /* Hello_User */
 783
 784
 785 static void
 786 Kill_Nick( char *Nick, char *Reason )
 787 {
 788         REQUEST r;
 789
 790         assert( Nick != NULL );
 791         assert( Reason != NULL );
 792
 793         r.prefix = (char *)Client_ThisServer( );
 794         r.argv[0] = Nick;
 795         r.argv[1] = Reason;
 796         r.argc = 2;
 797
 798         Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
 799         IRC_KILL( Client_ThisServer( ), &r );
 800 } /* Kill_Nick */
 801
 802
 803 static void
 804 Introduce_Client(CLIENT *From, CLIENT *Client, int Type)
 805 {
 806         /* Set client type (user or service) */
 807         Client_SetType(Client, Type);
 808
 809         if (From) {
 810                 if (Conf_IsService(Conf_GetServer(Client_Conn(From)),
 811                                    Client_ID(Client)))
 812                         Client_SetType(Client, CLIENT_SERVICE);
 813                 LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
 814                          Client_TypeText(Client), Client_Mask(Client),
 815                          Client_Modes(Client), Client_ID(From),
 816                          Client_ID(Client_Introducer(Client)),
 817                          Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
 818         } else
 819                 Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
 820                     Client_TypeText(Client), Client_Mask(Client),
 821                     Client_Conn(Client));
 822
 823         /* Inform other servers */
 824         IRC_WriteStrServersPrefixFlag_CB(From,
 825                                 From != NULL ? From : Client_ThisServer(),
 826                                 '\0', cb_introduceClient, (void *)Client);
 827 } /* Introduce_Client */
 828
 829
 830 static void
 831 cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
 832 {
 833         CLIENT *c = (CLIENT *)data;
 834         CONN_ID conn;
 835         char *modes, *user, *host;
 836
 837         modes = Client_Modes(c);
 838         user = Client_User(c) ? Client_User(c) : "-";
 839         host = Client_Hostname(c) ? Client_Hostname(c) : "-";
 840
 841         conn = Client_Conn(To);
 842         if (Conn_Options(conn) & CONN_RFC1459) {
 843                 /* RFC 1459 mode: separate NICK and USER commands */
 844                 Conn_WriteStr(conn, "NICK %s :%d", Client_ID(c),
 845                               Client_Hops(c) + 1);
 846                 Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
 847                               Client_ID(c), user, host,
 848                               Client_ID(Client_Introducer(c)), Client_Info(c));
 849                 if (modes[0])
 850                         Conn_WriteStr(conn, ":%s MODE %s +%s",
 851                                       Client_ID(c), Client_ID(c), modes);
 852         } else {
 853                 /* RFC 2813 mode: one combined NICK or SERVICE command */
 854                 if (Client_Type(c) == CLIENT_SERVICE
 855                     && strchr(Client_Flags(To), 'S'))
 856                         IRC_WriteStrClientPrefix(To, Prefix,
 857                                          "SERVICE %s %d * +%s %d :%s",
 858                                          Client_Mask(c),
 859                                          Client_MyToken(Client_Introducer(c)),
 860                                          Client_Modes(c), Client_Hops(c) + 1,
 861                                          Client_Info(c));
 862                 else
 863                         IRC_WriteStrClientPrefix(To, Prefix,
 864                                          "NICK %s %d %s %s %d +%s :%s",
 865                                          Client_ID(c), Client_Hops(c) + 1,
 866                                          user, host,
 867                                          Client_MyToken(Client_Introducer(c)),
 868                                          modes, Client_Info(c));
 869         }
 870 } /* cb_introduceClient */
 871
 872
 873 /* -eof- */