src/ngircd/irc-login.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
   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
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * Login and logout
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <strings.h>
  24
  25 #include "conn-func.h"
  26 #include "class.h"
  27 #include "conf.h"
  28 #include "channel.h"
  29 #include "log.h"
  30 #include "login.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 static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
  41
  42 /**
  43  * Handler for the IRC "PASS" command.
  44  *
  45  * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
  46  *
  47  * @param Client        The client from which this command has been received.
  48  * @param Req           Request structure with prefix and all parameters.
  49  * @returns             CONNECTED or DISCONNECTED.
  50  */
  51 GLOBAL bool
  52 IRC_PASS( CLIENT *Client, REQUEST *Req )
  53 {
  54         char *type, *orig_flags;
  55         int protohigh, protolow;
  56
  57         assert( Client != NULL );
  58         assert( Req != NULL );
  59
  60         /* Return an error if this is not a local client */
  61         if (Client_Conn(Client) <= NONE)
  62                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  63                                           Client_ID(Client), Req->command);
  64
  65         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  66                 /* Not yet registered "unknown" connection, PASS with one
  67                  * argument: either a regular client, service, or server
  68                  * using the old RFC 1459 section 4.1.1 syntax. */
  69                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  70                          Client_Conn(Client));
  71         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  72                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  73                    (Req->argc == 3 || Req->argc == 4)) {
  74                 /* Not yet registered "unknown" connection or outgoing server
  75                  * link, PASS with three or four argument: server using the
  76                  * RFC 2813 section 4.1.1 syntax. */
  77                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  78                          Client_Conn(Client));
  79         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  80                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  81                 /* Unregistered connection, but wrong number of arguments: */
  82                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  83                                           Client_ID(Client), Req->command);
  84         } else {
  85                 /* Registered connection, PASS command is not allowed! */
  86                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
  87                                           Client_ID(Client));
  88         }
  89
  90         Conn_SetPassword(Client_Conn(Client), Req->argv[0]);
  91
  92         /* Protocol version */
  93         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
  94                 int c2, c4;
  95
  96                 c2 = Req->argv[1][2];
  97                 c4 = Req->argv[1][4];
  98
  99                 Req->argv[1][4] = '\0';
 100                 protolow = atoi(&Req->argv[1][2]);
 101                 Req->argv[1][2] = '\0';
 102                 protohigh = atoi(Req->argv[1]);
 103
 104                 Req->argv[1][2] = c2;
 105                 Req->argv[1][4] = c4;
 106
 107                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 108         } else {
 109                 protohigh = protolow = 0;
 110                 Client_SetType(Client, CLIENT_GOTPASS);
 111         }
 112
 113         /* Protocol type, see doc/Protocol.txt */
 114         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 115                 type = &Req->argv[1][4];
 116         else
 117                 type = NULL;
 118
 119         /* Protocol flags/options */
 120         if (Req->argc >= 4)
 121                 orig_flags = Req->argv[3];
 122         else
 123                 orig_flags = "";
 124
 125         /* Implementation, version and IRC+ flags */
 126         if (Req->argc >= 3) {
 127                 char *impl, *ptr, *serverver, *flags;
 128
 129                 impl = Req->argv[2];
 130                 ptr = strchr(impl, '|');
 131                 if (ptr)
 132                         *ptr = '\0';
 133
 134                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 135                         /* The peer seems to be a server which supports the
 136                          * IRC+ protocol (see doc/Protocol.txt). */
 137                         serverver = ptr ? ptr + 1 : "?";
 138                         flags = strchr(ptr ? serverver : impl, ':');
 139                         if (flags) {
 140                                 *flags = '\0';
 141                                 flags++;
 142                         } else
 143                                 flags = "";
 144                         Log(LOG_INFO,
 145                             "Peer on conenction %d announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 146                             Client_Conn(Client), impl, serverver,
 147                             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 on connection %d announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 157                             Client_Conn(Client), impl,
 158                             protohigh, protolow, flags);
 159                 }
 160                 Client_SetFlags(Client, flags);
 161         }
 162
 163         return CONNECTED;
 164 } /* IRC_PASS */
 165
 166
 167 /**
 168  * Handler for the IRC "NICK" command.
 169  *
 170  * See RFC 2812, 3.1.2 "Nick message", and RFC 2813, 4.1.3 "Nick".
 171  *
 172  * This function implements the IRC command "NICK" which is used to register
 173  * with the server, to change already registered nicknames and to introduce
 174  * new users which are connected to other servers.
 175  *
 176  * @param Client        The client from which this command has been received.
 177  * @param Req           Request structure with prefix and all parameters.
 178  * @returns             CONNECTED or DISCONNECTED.
 179  */
 180 GLOBAL bool
 181 IRC_NICK( CLIENT *Client, REQUEST *Req )
 182 {
 183         CLIENT *intr_c, *target, *c;
 184         char *nick, *user, *hostname, *modes, *info;
 185         int token, hops;
 186
 187         assert( Client != NULL );
 188         assert( Req != NULL );
 189
 190         /* Some IRC clients, for example BitchX, send the NICK and USER
 191          * commands in the wrong order ... */
 192         if(Client_Type(Client) == CLIENT_UNKNOWN
 193             || Client_Type(Client) == CLIENT_GOTPASS
 194             || Client_Type(Client) == CLIENT_GOTNICK
 195 #ifndef STRICT_RFC
 196             || Client_Type(Client) == CLIENT_GOTUSER
 197 #endif
 198             || Client_Type(Client) == CLIENT_USER
 199             || Client_Type(Client) == CLIENT_SERVICE
 200             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 201         {
 202                 /* User registration or change of nickname */
 203
 204                 /* Wrong number of arguments? */
 205                 if( Req->argc != 1 )
 206                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 207                                                    Client_ID( Client ),
 208                                                    Req->command );
 209
 210                 /* Search "target" client */
 211                 if( Client_Type( Client ) == CLIENT_SERVER )
 212                 {
 213                         target = Client_Search( Req->prefix );
 214                         if( ! target )
 215                                 return IRC_WriteStrClient( Client,
 216                                                            ERR_NOSUCHNICK_MSG,
 217                                                            Client_ID( Client ),
 218                                                            Req->argv[0] );
 219                 }
 220                 else
 221                 {
 222                         /* Is this a restricted client? */
 223                         if( Client_HasMode( Client, 'r' ))
 224                                 return IRC_WriteStrClient( Client,
 225                                                            ERR_RESTRICTED_MSG,
 226                                                            Client_ID( Client ));
 227
 228                         target = Client;
 229                 }
 230
 231 #ifndef STRICT_RFC
 232                 /* If the clients tries to change to its own nickname we won't
 233                  * do anything. This is how the original ircd behaves and some
 234                  * clients (for example Snak) expect it to be like this.
 235                  * But I doubt that this is "really the right thing" ... */
 236                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 237                         return CONNECTED;
 238 #endif
 239
 240                 /* Check that the new nickname is available. Special case:
 241                  * the client only changes from/to upper to lower case. */
 242                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 243                 {
 244                         if( ! Client_CheckNick( target, Req->argv[0] ))
 245                                 return CONNECTED;
 246                 }
 247
 248                 if (Client_Type(target) != CLIENT_USER &&
 249                     Client_Type(target) != CLIENT_SERVICE &&
 250                     Client_Type(target) != CLIENT_SERVER) {
 251                         /* New client */
 252                         LogDebug("Connection %d: got valid NICK command ...",
 253                              Client_Conn( Client ));
 254
 255                         /* Register new nickname of this client */
 256                         Client_SetID( target, Req->argv[0] );
 257
 258 #ifndef STRICT_RFC
 259                         if (Conf_AuthPing) {
 260                                 Conn_SetAuthPing(Client_Conn(Client), rand());
 261                                 IRC_WriteStrClient(Client, "PING :%ld",
 262                                         Conn_GetAuthPing(Client_Conn(Client)));
 263                                 LogDebug("Connection %d: sent AUTH PING %ld ...",
 264                                         Client_Conn(Client),
 265                                         Conn_GetAuthPing(Client_Conn(Client)));
 266                         }
 267 #endif
 268
 269                         /* If we received a valid USER command already then
 270                          * register the new client! */
 271                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 272                                 return Login_User( Client );
 273                         else
 274                                 Client_SetType( Client, CLIENT_GOTNICK );
 275                 } else {
 276                         /* Nickname change */
 277                         if (Client_Conn(target) > NONE) {
 278                                 /* Local client */
 279                                 Log(LOG_INFO,
 280                                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 281                                     Client_TypeText(target), Client_Mask(target),
 282                                     Client_Conn(target), Client_ID(target),
 283                                     Req->argv[0]);
 284                                 Conn_UpdateIdle(Client_Conn(target));
 285                         } else {
 286                                 /* Remote client */
 287                                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 288                                          Client_TypeText(target),
 289                                          Client_Mask(target), Client_ID(target),
 290                                          Req->argv[0]);
 291                         }
 292
 293                         /* Inform all users and servers (which have to know)
 294                          * of this nickname change */
 295                         if( Client_Type( Client ) == CLIENT_USER )
 296                                 IRC_WriteStrClientPrefix( Client, Client,
 297                                                           "NICK :%s",
 298                                                           Req->argv[0] );
 299                         IRC_WriteStrServersPrefix( Client, target,
 300                                                    "NICK :%s", Req->argv[0] );
 301                         IRC_WriteStrRelatedPrefix( target, target, false,
 302                                                    "NICK :%s", Req->argv[0] );
 303
 304                         /* Register old nickname for WHOWAS queries */
 305                         Client_RegisterWhowas( target );
 306
 307                         /* Save new nickname */
 308                         Client_SetID( target, Req->argv[0] );
 309
 310                         IRC_SetPenalty( target, 2 );
 311                 }
 312
 313                 return CONNECTED;
 314         } else if(Client_Type(Client) == CLIENT_SERVER ||
 315                   Client_Type(Client) == CLIENT_SERVICE) {
 316                 /* Server or service introduces new client */
 317
 318                 /* Bad number of parameters? */
 319                 if (Req->argc != 2 && Req->argc != 7)
 320                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 321                                                   Client_ID(Client), Req->command);
 322
 323                 if (Req->argc >= 7) {
 324                         /* RFC 2813 compatible syntax */
 325                         nick = Req->argv[0];
 326                         hops = atoi(Req->argv[1]);
 327                         user = Req->argv[2];
 328                         hostname = Req->argv[3];
 329                         token = atoi(Req->argv[4]);
 330                         modes = Req->argv[5] + 1;
 331                         info = Req->argv[6];
 332                 } else {
 333                         /* RFC 1459 compatible syntax */
 334                         nick = Req->argv[0];
 335                         hops = 1;
 336                         user = Req->argv[0];
 337                         hostname = Client_ID(Client);
 338                         token = atoi(Req->argv[1]);
 339                         modes = "";
 340                         info = Req->argv[0];
 341                 }
 342
 343                 c = Client_Search(nick);
 344                 if(c) {
 345                         /*
 346                          * the new nick is already present on this server:
 347                          * the new and the old one have to be disconnected now.
 348                          */
 349                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 350                         Kill_Nick( Req->argv[0], "Nick collision" );
 351                         return CONNECTED;
 352                 }
 353
 354                 /* Find the Server this client is connected to */
 355                 intr_c = Client_GetFromToken(Client, token);
 356                 if( ! intr_c )
 357                 {
 358                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 359                         Kill_Nick( Req->argv[0], "Unknown server" );
 360                         return CONNECTED;
 361                 }
 362
 363                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 364                                          token, modes, info, true);
 365                 if( ! c )
 366                 {
 367                         /* out of memory, need to disconnect client to keep network state consistent */
 368                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 369                         Kill_Nick( Req->argv[0], "Server error" );
 370                         return CONNECTED;
 371                 }
 372
 373                 /* RFC 2813: client is now fully registered, inform all the
 374                  * other servers about the new user.
 375                  * RFC 1459: announce the new client only after receiving the
 376                  * USER command, first we need more information! */
 377                 if (Req->argc < 7) {
 378                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 379                                  Client_Mask(c));
 380                         Client_SetType(c, CLIENT_GOTNICK);
 381                 } else
 382                         Client_Introduce(Client, c, CLIENT_USER);
 383
 384                 return CONNECTED;
 385         }
 386         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 387 } /* IRC_NICK */
 388
 389
 390 /**
 391  * Handler for the IRC "USER" command.
 392  *
 393  * See RFC 2812, 3.1.3 "User message".
 394  *
 395  * @param Client        The client from which this command has been received.
 396  * @param Req           Request structure with prefix and all parameters.
 397  * @returns             CONNECTED or DISCONNECTED.
 398  */
 399 GLOBAL bool
 400 IRC_USER(CLIENT * Client, REQUEST * Req)
 401 {
 402         CLIENT *c;
 403         char *ptr;
 404
 405         assert(Client != NULL);
 406         assert(Req != NULL);
 407
 408         if (Client_Type(Client) == CLIENT_GOTNICK ||
 409 #ifndef STRICT_RFC
 410             Client_Type(Client) == CLIENT_UNKNOWN ||
 411 #endif
 412             Client_Type(Client) == CLIENT_GOTPASS)
 413         {
 414                 /* New connection */
 415                 if (Req->argc != 4)
 416                         return IRC_WriteStrClient(Client,
 417                                                   ERR_NEEDMOREPARAMS_MSG,
 418                                                   Client_ID(Client),
 419                                                   Req->command);
 420
 421                 /* User name: only alphanumeric characters and limited
 422                    punctuation is allowed.*/
 423                 ptr = Req->argv[0];
 424                 while (*ptr) {
 425                         if ((*ptr < '0' || *ptr > '9') &&
 426                             (*ptr < 'A' || *ptr > 'Z') &&
 427                             (*ptr < 'a' || *ptr > 'z') &&
 428                             (*ptr != '+') && (*ptr != '-') &&
 429                             (*ptr != '.') && (*ptr != '_')) {
 430                                 Conn_Close(Client_Conn(Client), NULL,
 431                                            "Invalid user name", true);
 432                                 return DISCONNECTED;
 433                         }
 434                         ptr++;
 435                 }
 436
 437 #ifdef IDENTAUTH
 438                 ptr = Client_User(Client);
 439                 if (!ptr || !*ptr || *ptr == '~')
 440                         Client_SetUser(Client, Req->argv[0], false);
 441 #else
 442                 Client_SetUser(Client, Req->argv[0], false);
 443 #endif
 444                 Client_SetOrigUser(Client, Req->argv[0]);
 445
 446                 /* "Real name" or user info text: Don't set it to the empty
 447                  * string, the original ircd can't deal with such "real names"
 448                  * (e. g. "USER user * * :") ... */
 449                 if (*Req->argv[3])
 450                         Client_SetInfo(Client, Req->argv[3]);
 451                 else
 452                         Client_SetInfo(Client, "-");
 453
 454                 LogDebug("Connection %d: got valid USER command ...",
 455                     Client_Conn(Client));
 456                 if (Client_Type(Client) == CLIENT_GOTNICK)
 457                         return Login_User(Client);
 458                 else
 459                         Client_SetType(Client, CLIENT_GOTUSER);
 460                 return CONNECTED;
 461
 462         } else if (Client_Type(Client) == CLIENT_SERVER ||
 463                    Client_Type(Client) == CLIENT_SERVICE) {
 464                 /* Server/service updating an user */
 465                 if (Req->argc != 4)
 466                         return IRC_WriteStrClient(Client,
 467                                                   ERR_NEEDMOREPARAMS_MSG,
 468                                                   Client_ID(Client),
 469                                                   Req->command);
 470                 c = Client_Search(Req->prefix);
 471                 if (!c)
 472                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 473                                                   Client_ID(Client),
 474                                                   Req->prefix);
 475
 476                 Client_SetUser(c, Req->argv[0], true);
 477                 Client_SetOrigUser(c, Req->argv[0]);
 478                 Client_SetHostname(c, Req->argv[1]);
 479                 Client_SetInfo(c, Req->argv[3]);
 480
 481                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 482                          Client_Conn(Client), Client_Mask(c));
 483
 484                 /* RFC 1459 style user registration?
 485                  * Introduce client to network: */
 486                 if (Client_Type(c) == CLIENT_GOTNICK)
 487                         Client_Introduce(Client, c, CLIENT_USER);
 488
 489                 return CONNECTED;
 490         } else if (Client_Type(Client) == CLIENT_USER) {
 491                 /* Already registered connection */
 492                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 493                                           Client_ID(Client));
 494         } else {
 495                 /* Unexpected/invalid connection state? */
 496                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 497                                           Client_ID(Client));
 498         }
 499 } /* IRC_USER */
 500
 501
 502 /**
 503  * Handler for the IRC "SERVICE" command.
 504  *
 505  * This function implements IRC Services registration using the SERVICE command
 506  * defined in RFC 2812 3.1.6 and RFC 2813 4.1.4.
 507  *
 508  * At the moment ngIRCd doesn't support directly linked services, so this
 509  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 510  * received from a peer server.
 511  *
 512  * @param Client        The client from which this command has been received.
 513  * @param Req           Request structure with prefix and all parameters.
 514  * @returns             CONNECTED or DISCONNECTED..
 515  */
 516 GLOBAL bool
 517 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 518 {
 519         CLIENT *c, *intr_c;
 520         char *nick, *user, *host, *info, *modes, *ptr;
 521         int token, hops;
 522
 523         assert(Client != NULL);
 524         assert(Req != NULL);
 525
 526         if (Client_Type(Client) != CLIENT_GOTPASS &&
 527             Client_Type(Client) != CLIENT_SERVER)
 528                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 529                                           Client_ID(Client));
 530
 531         if (Req->argc != 6)
 532                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 533                                           Client_ID(Client), Req->command);
 534
 535         if (Client_Type(Client) != CLIENT_SERVER)
 536                 return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 537                                   Client_ID(Client), Req->argv[0]);
 538
 539         /* Bad number of parameters? */
 540         if (Req->argc != 6)
 541                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 542                                           Client_ID(Client), Req->command);
 543
 544         nick = Req->argv[0];
 545         user = NULL; host = NULL;
 546         token = atoi(Req->argv[1]);
 547         hops = atoi(Req->argv[4]);
 548         info = Req->argv[5];
 549
 550         /* Validate service name ("nick name") */
 551         c = Client_Search(nick);
 552         if(c) {
 553                 /* Nick name collission: disconnect (KILL) both clients! */
 554                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 555                     Client_ID(Client), nick);
 556                 Kill_Nick(nick, "Nick collision");
 557                 return CONNECTED;
 558         }
 559
 560         /* Get the server to which the service is connected */
 561         intr_c = Client_GetFromToken(Client, token);
 562         if (! intr_c) {
 563                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 564                     Client_ID(Client), nick);
 565                 Kill_Nick(nick, "Unknown server");
 566                 return CONNECTED;
 567         }
 568
 569         /* Get user and host name */
 570         ptr = strchr(nick, '@');
 571         if (ptr) {
 572                 *ptr = '\0';
 573                 host = ++ptr;
 574         }
 575         if (!host)
 576                 host = Client_Hostname(intr_c);
 577         ptr = strchr(nick, '!');
 578         if (ptr) {
 579                 *ptr = '\0';
 580                 user = ++ptr;
 581         }
 582         if (!user)
 583                 user = nick;
 584
 585         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 586          * for future usage"; but we use it to transfer the modes and check
 587          * that the first character is a '+' sign and ignore it otherwise. */
 588         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 589
 590         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 591                                  token, modes, info, true);
 592         if (! c) {
 593                 /* Couldn't create client structure, so KILL the service to
 594                  * keep network status consistent ... */
 595                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 596                     Client_Conn(Client));
 597                 Kill_Nick(nick, "Server error");
 598                 return CONNECTED;
 599         }
 600
 601         Client_Introduce(Client, c, CLIENT_SERVICE);
 602         return CONNECTED;
 603 } /* IRC_SERVICE */
 604
 605
 606 /**
 607  * Handler for the IRC "WEBIRC" command.
 608  *
 609  * See doc/Protocol.txt, section II.4:
 610  * "Update webchat/proxy client information".
 611  *
 612  * @param Client        The client from which this command has been received.
 613  * @param Req           Request structure with prefix and all parameters.
 614  * @returns             CONNECTED or DISCONNECTED.
 615  */
 616 GLOBAL bool
 617 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 618 {
 619         /* Exactly 4 parameters are requited */
 620         if (Req->argc != 4)
 621                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 622                                           Client_ID(Client), Req->command);
 623
 624         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 625                 return IRC_WriteStrClient(Client, ERR_PASSWDMISMATCH_MSG,
 626                                           Client_ID(Client));
 627
 628         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 629                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 630
 631         Client_SetUser(Client, Req->argv[1], true);
 632         Client_SetOrigUser(Client, Req->argv[1]);
 633         Client_SetHostname(Client, Req->argv[2]);
 634         return CONNECTED;
 635 } /* IRC_WEBIRC */
 636
 637
 638 /**
 639  * Handler for the IRC "QUIT" command.
 640  *
 641  * See RFC 2812, 3.1.7 "Quit", and RFC 2813, 4.1.5 "Quit".
 642  *
 643  * @param Client        The client from which this command has been received.
 644  * @param Req           Request structure with prefix and all parameters.
 645  * @returns             CONNECTED or DISCONNECTED.
 646  */
 647 GLOBAL bool
 648 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 649 {
 650         CLIENT *target;
 651         char quitmsg[LINE_LEN];
 652
 653         assert(Client != NULL);
 654         assert(Req != NULL);
 655
 656         /* Wrong number of arguments? */
 657         if (Req->argc > 1)
 658                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 659                                           Client_ID(Client), Req->command);
 660
 661         if (Req->argc == 1)
 662                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 663
 664         if (Client_Type(Client) == CLIENT_SERVER) {
 665                 /* Server */
 666                 target = Client_Search(Req->prefix);
 667                 if (!target) {
 668                         Log(LOG_WARNING,
 669                             "Got QUIT from %s for unknown client!?",
 670                             Client_ID(Client));
 671                         return CONNECTED;
 672                 }
 673
 674                 if (target != Client) {
 675                         Client_Destroy(target, "Got QUIT command.",
 676                                        Req->argc == 1 ? quitmsg : NULL, true);
 677                         return CONNECTED;
 678                 } else {
 679                         Conn_Close(Client_Conn(Client), "Got QUIT command.",
 680                                    Req->argc == 1 ? quitmsg : NULL, true);
 681                         return DISCONNECTED;
 682                 }
 683         } else {
 684                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 685                         /* " " to avoid confusion */
 686                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 687                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 688                         strlcat(quitmsg, "\"", sizeof quitmsg );
 689                 }
 690
 691                 /* User, Service, or not yet registered */
 692                 Conn_Close(Client_Conn(Client), "Got QUIT command.",
 693                            Req->argc == 1 ? quitmsg : NULL, true);
 694
 695                 return DISCONNECTED;
 696         }
 697 } /* IRC_QUIT */
 698
 699
 700 #ifndef STRICT_RFC
 701
 702 /**
 703  * Handler for HTTP command, e.g. GET and POST
 704  *
 705  * We handle these commands here to avoid the quite long timeout when
 706  * some user tries to access this IRC daemon using an web browser ...
 707  *
 708  * @param Client        The client from which this command has been received.
 709  * @param Req           Request structure with prefix and all parameters.
 710  * @returns             CONNECTED or DISCONNECTED.
 711  */
 712 GLOBAL bool
 713 IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
 714 {
 715         Req->argc = 1;
 716         Req->argv[0] = "Oops, HTTP request received? This is IRC!";
 717         return IRC_QUIT(Client, Req);
 718 } /* IRC_QUIT_HTTP */
 719
 720 #endif
 721
 722
 723 /**
 724  * Handler for the IRC "PING" command.
 725  *
 726  * See RFC 2812, 3.7.2 "Ping message".
 727  *
 728  * @param Client        The client from which this command has been received.
 729  * @param Req           Request structure with prefix and all parameters.
 730  * @returns             CONNECTED or DISCONNECTED.
 731  */
 732 GLOBAL bool
 733 IRC_PING(CLIENT *Client, REQUEST *Req)
 734 {
 735         CLIENT *target, *from;
 736
 737         assert(Client != NULL);
 738         assert(Req != NULL);
 739
 740         if (Req->argc < 1)
 741                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 742                                           Client_ID(Client));
 743 #ifdef STRICT_RFC
 744         /* Don't ignore additional arguments when in "strict" mode */
 745         if (Req->argc > 2)
 746                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 747                                            Client_ID(Client), Req->command);
 748 #endif
 749
 750         if (Req->argc > 1) {
 751                 /* A target has been specified ... */
 752                 target = Client_Search(Req->argv[1]);
 753
 754                 if (!target || Client_Type(target) != CLIENT_SERVER)
 755                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 756                                         Client_ID(Client), Req->argv[1]);
 757
 758                 if (target != Client_ThisServer()) {
 759                         /* Ok, we have to forward the PING */
 760                         if (Client_Type(Client) == CLIENT_SERVER)
 761                                 from = Client_Search(Req->prefix);
 762                         else
 763                                 from = Client;
 764                         if (!from)
 765                                 return IRC_WriteStrClient(Client,
 766                                                 ERR_NOSUCHSERVER_MSG,
 767                                                 Client_ID(Client), Req->prefix);
 768
 769                         return IRC_WriteStrClientPrefix(target, from,
 770                                         "PING %s :%s", Req->argv[0],
 771                                         Req->argv[1] );
 772                 }
 773         }
 774
 775         if (Client_Type(Client) == CLIENT_SERVER) {
 776                 if (Req->prefix)
 777                         from = Client_Search(Req->prefix);
 778                 else
 779                         from = Client;
 780         } else
 781                 from = Client_ThisServer();
 782         if (!from)
 783                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 784                                         Client_ID(Client), Req->prefix);
 785
 786         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 787             Client_Conn(Client));
 788
 789 #ifdef STRICT_RFC
 790         return IRC_WriteStrClient(Client, "PONG %s :%s",
 791                 Client_ID(from), Client_ID(Client));
 792 #else
 793         /* Some clients depend on the argument being returned in the PONG
 794          * reply (not mentioned in any RFC, though) */
 795         return IRC_WriteStrClient(Client, "PONG %s :%s",
 796                 Client_ID(from), Req->argv[0]);
 797 #endif
 798 } /* IRC_PING */
 799
 800
 801 /**
 802  * Handler for the IRC "PONG" command.
 803  *
 804  * See RFC 2812, 3.7.3 "Pong message".
 805  *
 806  * @param Client        The client from which this command has been received.
 807  * @param Req           Request structure with prefix and all parameters.
 808  * @returns             CONNECTED or DISCONNECTED.
 809  */
 810 GLOBAL bool
 811 IRC_PONG(CLIENT *Client, REQUEST *Req)
 812 {
 813         CLIENT *target, *from;
 814         CONN_ID conn;
 815 #ifndef STRICT_RFC
 816         long auth_ping;
 817 #endif
 818         char *s;
 819
 820         assert(Client != NULL);
 821         assert(Req != NULL);
 822
 823         /* Wrong number of arguments? */
 824         if (Req->argc < 1) {
 825                 if (Client_Type(Client) == CLIENT_USER)
 826                         return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 827                                                   Client_ID(Client));
 828                 else
 829                         return CONNECTED;
 830         }
 831         if (Req->argc > 2) {
 832                 if (Client_Type(Client) == CLIENT_USER)
 833                         return IRC_WriteStrClient(Client,
 834                                                   ERR_NEEDMOREPARAMS_MSG,
 835                                                   Client_ID(Client),
 836                                                   Req->command);
 837                 else
 838                         return CONNECTED;
 839         }
 840
 841         /* Forward? */
 842         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 843                 target = Client_Search(Req->argv[0]);
 844                 if (!target)
 845                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 846                                         Client_ID(Client), Req->argv[0]);
 847
 848                 from = Client_Search(Req->prefix);
 849
 850                 if (target != Client_ThisServer() && target != from) {
 851                         /* Ok, we have to forward the message. */
 852                         if (!from)
 853                                 return IRC_WriteStrClient(Client,
 854                                                 ERR_NOSUCHSERVER_MSG,
 855                                                 Client_ID(Client), Req->prefix);
 856
 857                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 858                                 s = Client_ID(from);
 859                         else
 860                                 s = Req->argv[0];
 861                         return IRC_WriteStrClientPrefix(target, from,
 862                                  "PONG %s :%s", s, Req->argv[1]);
 863                 }
 864         }
 865
 866         /* The connection timestamp has already been updated when the data has
 867          * been read from so socket, so we don't need to update it here. */
 868
 869         conn = Client_Conn(Client);
 870
 871 #ifndef STRICT_RFC
 872         /* Check authentication PING-PONG ... */
 873         auth_ping = Conn_GetAuthPing(conn);
 874         if (auth_ping) {
 875                 LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
 876                          auth_ping, Req->argv[0]);
 877                 if (auth_ping == atoi(Req->argv[0])) {
 878                         Conn_SetAuthPing(conn, 0);
 879                         if (Client_Type(Client) == CLIENT_WAITAUTHPING)
 880                                 Login_User(Client);
 881                 } else
 882                         if (!IRC_WriteStrClient(Client,
 883                                         "To connect, type /QUOTE PONG %ld",
 884                                         auth_ping))
 885                                 return DISCONNECTED;
 886         }
 887 #endif
 888
 889         if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
 890                 Log(LOG_INFO,
 891                     "Synchronization with \"%s\" done (connection %d): %ld seconds [%ld users, %ld channels]",
 892                     Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
 893                     Client_UserCount(), Channel_CountVisible(NULL));
 894                 Conn_UpdatePing(conn);
 895         } else
 896                 LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
 897                          conn, time(NULL) - Conn_LastPing(conn));
 898
 899         return CONNECTED;
 900 } /* IRC_PONG */
 901
 902
 903 /**
 904  * Kill all users with a specific nick name in the network.
 905  *
 906  * @param Nick          Nick name.
 907  * @param Reason        Reason for the KILL.
 908  */
 909 static void
 910 Kill_Nick(char *Nick, char *Reason)
 911 {
 912         REQUEST r;
 913
 914         assert (Nick != NULL);
 915         assert (Reason != NULL);
 916
 917         r.prefix = NULL;
 918         r.argv[0] = Nick;
 919         r.argv[1] = Reason;
 920         r.argc = 2;
 921
 922         Log(LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s",
 923             Nick, Reason);
 924
 925         IRC_KILL(Client_ThisServer(), &r);
 926 } /* Kill_Nick */
 927
 928
 929 /* -eof- */