src/ngircd/irc-login.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2014 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 <assert.h>
  20 #include <ctype.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <strings.h>
  24 #include <time.h>
  25
  26 #include "conn-func.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-macros.h"
  35 #include "irc-write.h"
  36
  37 #include "irc-login.h"
  38
  39 static void Change_Nick PARAMS((CLIENT * Origin, CLIENT * Target, char *NewNick,
  40                                 bool InformClient));
  41
  42 /**
  43  * Handler for the IRC "PASS" command.
  44  *
  45  * @param Client The client from which this command has been received.
  46  * @param Req Request structure with prefix and all parameters.
  47  * @return CONNECTED or DISCONNECTED.
  48  */
  49 GLOBAL bool
  50 IRC_PASS( CLIENT *Client, REQUEST *Req )
  51 {
  52         char *type, *orig_flags;
  53         int protohigh, protolow;
  54
  55         assert( Client != NULL );
  56         assert( Req != NULL );
  57
  58         /* Return an error if this is not a local client */
  59         if (Client_Conn(Client) <= NONE)
  60                 return IRC_WriteErrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  61                                           Client_ID(Client), Req->command);
  62
  63         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  64                 /* Not yet registered "unknown" connection, PASS with one
  65                  * argument: either a regular client, service, or server
  66                  * using the old RFC 1459 section 4.1.1 syntax. */
  67                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  68                          Client_Conn(Client));
  69         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  70                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  71                    (Req->argc == 3 || Req->argc == 4)) {
  72                 /* Not yet registered "unknown" connection or outgoing server
  73                  * link, PASS with three or four argument: server using the
  74                  * RFC 2813 section 4.1.1 syntax. */
  75                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  76                          Client_Conn(Client));
  77         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  78                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  79                 /* Unregistered connection, but wrong number of arguments: */
  80                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  81                                           Client_ID(Client), Req->command);
  82         } else {
  83                 /* Registered connection, PASS command is not allowed! */
  84                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
  85                                           Client_ID(Client));
  86         }
  87
  88         Conn_SetPassword(Client_Conn(Client), Req->argv[0]);
  89
  90         /* Protocol version */
  91         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
  92                 int c2, c4;
  93
  94                 c2 = Req->argv[1][2];
  95                 c4 = Req->argv[1][4];
  96
  97                 Req->argv[1][4] = '\0';
  98                 protolow = atoi(&Req->argv[1][2]);
  99                 Req->argv[1][2] = '\0';
 100                 protohigh = atoi(Req->argv[1]);
 101
 102                 Req->argv[1][2] = c2;
 103                 Req->argv[1][4] = c4;
 104
 105                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 106         } else {
 107                 protohigh = protolow = 0;
 108                 Client_SetType(Client, CLIENT_GOTPASS);
 109         }
 110
 111         /* Protocol type, see doc/Protocol.txt */
 112         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 113                 type = &Req->argv[1][4];
 114         else
 115                 type = NULL;
 116
 117         /* Protocol flags/options */
 118         if (Req->argc >= 4)
 119                 orig_flags = Req->argv[3];
 120         else
 121                 orig_flags = "";
 122
 123         /* Implementation, version and IRC+ flags */
 124         if (Req->argc >= 3) {
 125                 char *impl, *ptr, *serverver, *flags;
 126
 127                 impl = Req->argv[2];
 128                 ptr = strchr(impl, '|');
 129                 if (ptr)
 130                         *ptr = '\0';
 131
 132                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 133                         /* The peer seems to be a server which supports the
 134                          * IRC+ protocol (see doc/Protocol.txt). */
 135                         serverver = ptr ? ptr + 1 : "?";
 136                         flags = strchr(ptr ? serverver : impl, ':');
 137                         if (flags) {
 138                                 *flags = '\0';
 139                                 flags++;
 140                         } else
 141                                 flags = "";
 142                         Log(LOG_INFO,
 143                             "Peer on connection %d announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 144                             Client_Conn(Client), impl, serverver,
 145                             protohigh, protolow, flags);
 146                 } else {
 147                         /* The peer seems to be a server supporting the
 148                          * "original" IRC protocol (RFC 2813). */
 149                         if (strchr(orig_flags, 'Z'))
 150                                 flags = "Z";
 151                         else
 152                                 flags = "";
 153                         Log(LOG_INFO,
 154                             "Peer on connection %d announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 155                             Client_Conn(Client), impl,
 156                             protohigh, protolow, flags);
 157                 }
 158                 Client_SetFlags(Client, flags);
 159         }
 160
 161         return CONNECTED;
 162 } /* IRC_PASS */
 163
 164 /**
 165  * Handler for the IRC "NICK" command.
 166  *
 167  * @param Client The client from which this command has been received.
 168  * @param Req Request structure with prefix and all parameters.
 169  * @return CONNECTED or DISCONNECTED.
 170  */
 171 GLOBAL bool
 172 IRC_NICK( CLIENT *Client, REQUEST *Req )
 173 {
 174         CLIENT *intr_c, *target, *c;
 175         char *nick, *user, *hostname, *modes, *info;
 176         int token, hops;
 177
 178         assert( Client != NULL );
 179         assert( Req != NULL );
 180
 181         /* Some IRC clients, for example BitchX, send the NICK and USER
 182          * commands in the wrong order ... */
 183         if(Client_Type(Client) == CLIENT_UNKNOWN
 184             || Client_Type(Client) == CLIENT_GOTPASS
 185             || Client_Type(Client) == CLIENT_GOTNICK
 186 #ifndef STRICT_RFC
 187             || Client_Type(Client) == CLIENT_GOTUSER
 188 #endif
 189             || Client_Type(Client) == CLIENT_USER
 190             || Client_Type(Client) == CLIENT_SERVICE
 191             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 192         {
 193                 /* User registration or change of nickname */
 194                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 1)
 195
 196                 /* Search "target" client */
 197                 if (Client_Type(Client) == CLIENT_SERVER) {
 198                         target = Client_Search(Req->prefix);
 199                         if (!target)
 200                                 return IRC_WriteErrClient(Client,
 201                                                           ERR_NOSUCHNICK_MSG,
 202                                                           Client_ID(Client),
 203                                                           Req->argv[0]);
 204                 } else {
 205                         /* Is this a restricted client? */
 206                         if (Client_HasMode(Client, 'r'))
 207                                 return IRC_WriteErrClient(Client,
 208                                                           ERR_RESTRICTED_MSG,
 209                                                           Client_ID(Client));
 210                         target = Client;
 211                 }
 212
 213 #ifndef STRICT_RFC
 214                 /* If the clients tries to change to its own nickname we won't
 215                  * do anything. This is how the original ircd behaves and some
 216                  * clients (for example Snak) expect it to be like this.
 217                  * But I doubt that this is "really the right thing" ... */
 218                 if (strcmp(Client_ID(target), Req->argv[0]) == 0)
 219                         return CONNECTED;
 220 #endif
 221
 222                 /* Check that the new nickname is available. Special case:
 223                  * the client only changes from/to upper to lower case. */
 224                 if (strcasecmp(Client_ID(target), Req->argv[0]) != 0) {
 225                         if (!Client_CheckNick(target, Req->argv[0]))
 226                                 return CONNECTED;
 227                 }
 228
 229                 if (Client_Type(target) != CLIENT_USER &&
 230                     Client_Type(target) != CLIENT_SERVICE &&
 231                     Client_Type(target) != CLIENT_SERVER) {
 232                         /* New client */
 233                         LogDebug("Connection %d: got valid NICK command ...",
 234                              Client_Conn( Client ));
 235
 236                         /* Register new nickname of this client */
 237                         Client_SetID( target, Req->argv[0] );
 238
 239 #ifndef STRICT_RFC
 240                         if (Conf_AuthPing) {
 241 #ifdef HAVE_ARC4RANDOM
 242                                 Conn_SetAuthPing(Client_Conn(Client), arc4random());
 243 #else
 244                                 Conn_SetAuthPing(Client_Conn(Client), rand());
 245 #endif
 246                                 IRC_WriteStrClient(Client, "PING :%ld",
 247                                         Conn_GetAuthPing(Client_Conn(Client)));
 248                                 LogDebug("Connection %d: sent AUTH PING %ld ...",
 249                                         Client_Conn(Client),
 250                                         Conn_GetAuthPing(Client_Conn(Client)));
 251                         }
 252 #endif
 253
 254                         /* If we received a valid USER command already then
 255                          * register the new client! */
 256                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 257                                 return Login_User( Client );
 258                         else
 259                                 Client_SetType( Client, CLIENT_GOTNICK );
 260                 } else {
 261                         /* Nickname change */
 262                         Change_Nick(Client, target, Req->argv[0],
 263                                     Client_Type(Client) == CLIENT_USER ? true : false);
 264                         IRC_SetPenalty(target, 2);
 265                 }
 266
 267                 return CONNECTED;
 268         } else if(Client_Type(Client) == CLIENT_SERVER ||
 269                   Client_Type(Client) == CLIENT_SERVICE) {
 270                 /* Server or service introduces new client */
 271
 272                 /* Bad number of parameters? */
 273                 if (Req->argc != 2 && Req->argc != 7)
 274                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 275                                                   Client_ID(Client), Req->command);
 276
 277                 if (Req->argc >= 7) {
 278                         /* RFC 2813 compatible syntax */
 279                         nick = Req->argv[0];
 280                         hops = atoi(Req->argv[1]);
 281                         user = Req->argv[2];
 282                         hostname = Req->argv[3];
 283                         token = atoi(Req->argv[4]);
 284                         modes = Req->argv[5] + 1;
 285                         info = Req->argv[6];
 286                 } else {
 287                         /* RFC 1459 compatible syntax */
 288                         nick = Req->argv[0];
 289                         hops = 1;
 290                         user = Req->argv[0];
 291                         hostname = Client_ID(Client);
 292                         token = atoi(Req->argv[1]);
 293                         modes = "";
 294                         info = Req->argv[0];
 295                 }
 296
 297                 c = Client_Search(nick);
 298                 if(c) {
 299                         /*
 300                          * the new nick is already present on this server:
 301                          * the new and the old one have to be disconnected now.
 302                          */
 303                         Log(LOG_ERR,
 304                             "Server %s introduces already registered nick \"%s\"!",
 305                             Client_ID(Client), Req->argv[0]);
 306                         return IRC_KillClient(Client, NULL, Req->argv[0],
 307                                               "Nick collision");
 308                 }
 309
 310                 /* Find the Server this client is connected to */
 311                 intr_c = Client_GetFromToken(Client, token);
 312                 if (!intr_c) {
 313                         Log(LOG_ERR,
 314                             "Server %s introduces nick \"%s\" on unknown server!?",
 315                             Client_ID(Client), Req->argv[0]);
 316                         return IRC_KillClient(Client, NULL, Req->argv[0],
 317                                               "Unknown server");
 318                 }
 319
 320                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 321                                          token, modes, info, true);
 322                 if (!c) {
 323                         /* Out of memory, we need to disconnect client to keep
 324                          * network state consistent! */
 325                         Log(LOG_ALERT,
 326                             "Can't create client structure! (on connection %d)",
 327                             Client_Conn(Client));
 328                         return IRC_KillClient(Client, NULL, Req->argv[0],
 329                                               "Server error");
 330                 }
 331
 332                 /* RFC 2813: client is now fully registered, inform all the
 333                  * other servers about the new user.
 334                  * RFC 1459: announce the new client only after receiving the
 335                  * USER command, first we need more information! */
 336                 if (Req->argc < 7) {
 337                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 338                                  Client_Mask(c));
 339                         Client_SetType(c, CLIENT_GOTNICK);
 340                 } else
 341                         Client_Introduce(Client, c, CLIENT_USER);
 342
 343                 return CONNECTED;
 344         }
 345         else
 346                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 347                                           Client_ID(Client));
 348 } /* IRC_NICK */
 349
 350 /**
 351  * Handler for the IRC "SVSNICK" command.
 352  *
 353  * @param Client The client from which this command has been received.
 354  * @param Req Request structure with prefix and all parameters.
 355  * @return CONNECTED or DISCONNECTED.
 356  */
 357 GLOBAL bool
 358 IRC_SVSNICK(CLIENT *Client, REQUEST *Req)
 359 {
 360         CLIENT *from, *target;
 361
 362         assert(Client != NULL);
 363         assert(Req != NULL);
 364
 365         /* Search the originator */
 366         from = Client_Search(Req->prefix);
 367         if (!from)
 368                 from = Client;
 369
 370         /* Search the target */
 371         target = Client_Search(Req->argv[0]);
 372         if (!target || Client_Type(target) != CLIENT_USER)
 373                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 374                                           Client_ID(Client), Req->argv[0]);
 375
 376         if (Client_Conn(target) <= NONE) {
 377                 /* We have to forward the message to the server handling
 378                  * this user; this is required to make sure all servers
 379                  * in the network do follow the nick name change! */
 380                 return IRC_WriteStrClientPrefix(Client_NextHop(target), from,
 381                                                 "SVSNICK %s %s",
 382                                                 Req->argv[0], Req->argv[1]);
 383         }
 384
 385         /* Make sure that the new nickname is valid */
 386         if (!Client_CheckNick(from, Req->argv[1]))
 387                 return CONNECTED;
 388
 389         Change_Nick(from, target, Req->argv[1], true);
 390         return CONNECTED;
 391 }
 392
 393 /**
 394  * Handler for the IRC "USER" command.
 395  *
 396  * @param Client The client from which this command has been received.
 397  * @param Req Request structure with prefix and all parameters.
 398  * @return CONNECTED or DISCONNECTED.
 399  */
 400 GLOBAL bool
 401 IRC_USER(CLIENT * Client, REQUEST * Req)
 402 {
 403         CLIENT *c;
 404         char *ptr;
 405
 406         assert(Client != NULL);
 407         assert(Req != NULL);
 408
 409         if (Client_Type(Client) == CLIENT_GOTNICK ||
 410 #ifndef STRICT_RFC
 411             Client_Type(Client) == CLIENT_UNKNOWN ||
 412 #endif
 413             Client_Type(Client) == CLIENT_GOTPASS)
 414         {
 415                 /* New connection */
 416                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 417
 418                 /* User name: only alphanumeric characters and limited
 419                    punctuation is allowed.*/
 420                 ptr = Req->argv[0];
 421                 while (*ptr) {
 422                         if (!isalnum((int)*ptr) &&
 423                             *ptr != '+' && *ptr != '-' && *ptr != '@' &&
 424                             *ptr != '.' && *ptr != '_') {
 425                                 Conn_Close(Client_Conn(Client), NULL,
 426                                            "Invalid user name", true);
 427                                 return DISCONNECTED;
 428                         }
 429                         ptr++;
 430                 }
 431
 432                 /* Save the received username for authentication, and use
 433                  * it up to the first '@' as default user name (like ircd2.11,
 434                  * bahamut, ircd-seven, ...), prefixed with '~', if needed: */
 435                 Client_SetOrigUser(Client, Req->argv[0]);
 436                 ptr = strchr(Req->argv[0], '@');
 437                 if (ptr)
 438                         *ptr = '\0';
 439 #ifdef IDENTAUTH
 440                 ptr = Client_User(Client);
 441                 if (!ptr || !*ptr || *ptr == '~')
 442                         Client_SetUser(Client, Req->argv[0], false);
 443 #else
 444                 Client_SetUser(Client, Req->argv[0], false);
 445 #endif
 446
 447                 /* "Real name" or user info text: Don't set it to the empty
 448                  * string, the original ircd can't deal with such "real names"
 449                  * (e. g. "USER user * * :") ... */
 450                 if (*Req->argv[3])
 451                         Client_SetInfo(Client, Req->argv[3]);
 452                 else
 453                         Client_SetInfo(Client, "-");
 454
 455                 LogDebug("Connection %d: got valid USER command ...",
 456                     Client_Conn(Client));
 457                 if (Client_Type(Client) == CLIENT_GOTNICK)
 458                         return Login_User(Client);
 459                 else
 460                         Client_SetType(Client, CLIENT_GOTUSER);
 461                 return CONNECTED;
 462
 463         } else if (Client_Type(Client) == CLIENT_SERVER ||
 464                    Client_Type(Client) == CLIENT_SERVICE) {
 465                 /* Server/service updating an user */
 466                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 467
 468                 c = Client_Search(Req->prefix);
 469                 if (!c)
 470                         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 471                                                   Client_ID(Client),
 472                                                   Req->prefix);
 473
 474                 Client_SetUser(c, Req->argv[0], true);
 475                 Client_SetOrigUser(c, Req->argv[0]);
 476                 Client_SetHostname(c, Req->argv[1]);
 477                 Client_SetInfo(c, Req->argv[3]);
 478
 479                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 480                          Client_Conn(Client), Client_Mask(c));
 481
 482                 /* RFC 1459 style user registration?
 483                  * Introduce client to network: */
 484                 if (Client_Type(c) == CLIENT_GOTNICK)
 485                         Client_Introduce(Client, c, CLIENT_USER);
 486
 487                 return CONNECTED;
 488         } else if (Client_Type(Client) == CLIENT_USER) {
 489                 /* Already registered connection */
 490                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 491                                           Client_ID(Client));
 492         } else {
 493                 /* Unexpected/invalid connection state? */
 494                 return IRC_WriteErrClient(Client, ERR_NOTREGISTERED_MSG,
 495                                           Client_ID(Client));
 496         }
 497 } /* IRC_USER */
 498
 499 /**
 500  * Handler for the IRC "SERVICE" command.
 501  *
 502  * At the moment ngIRCd doesn't support directly linked services, so this
 503  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 504  * received from a peer server.
 505  *
 506  * @param Client The client from which this command has been received.
 507  * @param Req Request structure with prefix and all parameters.
 508  * @return CONNECTED or DISCONNECTED.
 509  */
 510 GLOBAL bool
 511 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 512 {
 513         CLIENT *c, *intr_c;
 514         char *nick, *user, *host, *info, *modes, *ptr;
 515         int token, hops;
 516
 517         assert(Client != NULL);
 518         assert(Req != NULL);
 519
 520         if (Client_Type(Client) != CLIENT_GOTPASS &&
 521             Client_Type(Client) != CLIENT_SERVER)
 522                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 523                                           Client_ID(Client));
 524
 525         if (Client_Type(Client) != CLIENT_SERVER)
 526                 return IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 527                                   Client_ID(Client), Req->argv[0]);
 528
 529         nick = Req->argv[0];
 530         user = NULL; host = NULL;
 531         token = atoi(Req->argv[1]);
 532         hops = atoi(Req->argv[4]);
 533         info = Req->argv[5];
 534
 535         /* Validate service name ("nickname") */
 536         c = Client_Search(nick);
 537         if(c) {
 538                 /* Nickname collision: disconnect (KILL) both clients! */
 539                 Log(LOG_ERR,
 540                     "Server %s introduces already registered service \"%s\"!",
 541                     Client_ID(Client), nick);
 542                 return IRC_KillClient(Client, NULL, nick, "Nick collision");
 543         }
 544
 545         /* Get the server to which the service is connected */
 546         intr_c = Client_GetFromToken(Client, token);
 547         if (! intr_c) {
 548                 Log(LOG_ERR,
 549                     "Server %s introduces service \"%s\" on unknown server!?",
 550                     Client_ID(Client), nick);
 551                 return IRC_KillClient(Client, NULL, nick, "Unknown server");
 552         }
 553
 554         /* Get user and host name */
 555         ptr = strchr(nick, '@');
 556         if (ptr) {
 557                 *ptr = '\0';
 558                 host = ++ptr;
 559         }
 560         if (!host)
 561                 host = Client_Hostname(intr_c);
 562         ptr = strchr(nick, '!');
 563         if (ptr) {
 564                 *ptr = '\0';
 565                 user = ++ptr;
 566         }
 567         if (!user)
 568                 user = nick;
 569
 570         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 571          * for future usage"; but we use it to transfer the modes and check
 572          * that the first character is a '+' sign and ignore it otherwise. */
 573         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 574
 575         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 576                                  token, modes, info, true);
 577         if (! c) {
 578                 /* Couldn't create client structure, so KILL the service to
 579                  * keep network status consistent ... */
 580                 Log(LOG_ALERT,
 581                     "Can't create client structure! (on connection %d)",
 582                     Client_Conn(Client));
 583                 return IRC_KillClient(Client, NULL, nick, "Server error");
 584         }
 585
 586         Client_Introduce(Client, c, CLIENT_SERVICE);
 587         return CONNECTED;
 588 } /* IRC_SERVICE */
 589
 590 /**
 591  * Handler for the IRC "WEBIRC" command.
 592  *
 593  * @param Client The client from which this command has been received.
 594  * @param Req Request structure with prefix and all parameters.
 595  * @return CONNECTED or DISCONNECTED.
 596  */
 597 GLOBAL bool
 598 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 599 {
 600         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 601                 return IRC_WriteErrClient(Client, ERR_PASSWDMISMATCH_MSG,
 602                                           Client_ID(Client));
 603
 604         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 605                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 606
 607         Client_SetUser(Client, Req->argv[1], true);
 608         Client_SetOrigUser(Client, Req->argv[1]);
 609         if (Conf_DNS)
 610                 Client_SetHostname(Client, Req->argv[2]);
 611         else
 612                 Client_SetHostname(Client, Req->argv[3]);
 613         Client_SetIPAText(Client, Req->argv[3]);
 614
 615         return CONNECTED;
 616 } /* IRC_WEBIRC */
 617
 618 /**
 619  * Handler for the IRC "QUIT" command.
 620  *
 621  * @param Client The client from which this command has been received.
 622  * @param Req Request structure with prefix and all parameters.
 623  * @return CONNECTED or DISCONNECTED.
 624  */
 625 GLOBAL bool
 626 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 627 {
 628         CLIENT *target;
 629         char quitmsg[COMMAND_LEN];
 630
 631         assert(Client != NULL);
 632         assert(Req != NULL);
 633
 634         if (Req->argc == 1)
 635                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 636
 637         if (Client_Type(Client) == CLIENT_SERVER) {
 638                 /* Server */
 639                 target = Client_Search(Req->prefix);
 640                 if (!target) {
 641                         Log(LOG_WARNING,
 642                             "Got QUIT from %s for unknown client!?",
 643                             Client_ID(Client));
 644                         return CONNECTED;
 645                 }
 646
 647                 if (target != Client) {
 648                         Client_Destroy(target, "Got QUIT command",
 649                                        Req->argc == 1 ? quitmsg : NULL, true);
 650                         return CONNECTED;
 651                 } else {
 652                         Conn_Close(Client_Conn(Client), "Got QUIT command",
 653                                    Req->argc == 1 ? quitmsg : NULL, true);
 654                         return DISCONNECTED;
 655                 }
 656         } else {
 657                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 658                         /* " " to avoid confusion */
 659                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 660                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 661                         strlcat(quitmsg, "\"", sizeof quitmsg );
 662                 }
 663
 664                 /* User, Service, or not yet registered */
 665                 Conn_Close(Client_Conn(Client), "Got QUIT command",
 666                            Req->argc == 1 ? quitmsg : NULL, true);
 667
 668                 return DISCONNECTED;
 669         }
 670 } /* IRC_QUIT */
 671
 672 #ifndef STRICT_RFC
 673
 674 /**
 675  * Handler for HTTP command, e.g. GET and POST
 676  *
 677  * We handle these commands here to avoid the quite long timeout when
 678  * some user tries to access this IRC daemon using an web browser ...
 679  *
 680  * @param Client The client from which this command has been received.
 681  * @param Req Request structure with prefix and all parameters.
 682  * @return CONNECTED or DISCONNECTED.
 683  */
 684 GLOBAL bool
 685 IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
 686 {
 687         Req->argc = 1;
 688         Req->argv[0] = "Oops, HTTP request received? This is IRC!";
 689         return IRC_QUIT(Client, Req);
 690 } /* IRC_QUIT_HTTP */
 691
 692 #endif
 693
 694 /**
 695  * Handler for the IRC "PING" command.
 696  *
 697  * @param Client The client from which this command has been received.
 698  * @param Req Request structure with prefix and all parameters.
 699  * @return CONNECTED or DISCONNECTED.
 700  */
 701 GLOBAL bool
 702 IRC_PING(CLIENT *Client, REQUEST *Req)
 703 {
 704         CLIENT *target, *from;
 705
 706         assert(Client != NULL);
 707         assert(Req != NULL);
 708
 709         if (Req->argc < 1)
 710                 return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 711                                           Client_ID(Client));
 712 #ifdef STRICT_RFC
 713         /* Don't ignore additional arguments when in "strict" mode */
 714         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 715 #endif
 716
 717         if (Req->argc > 1) {
 718                 /* A target has been specified ... */
 719                 target = Client_Search(Req->argv[1]);
 720
 721                 if (!target || Client_Type(target) != CLIENT_SERVER)
 722                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 723                                         Client_ID(Client), Req->argv[1]);
 724
 725                 if (target != Client_ThisServer()) {
 726                         /* Ok, we have to forward the PING */
 727                         if (Client_Type(Client) == CLIENT_SERVER)
 728                                 from = Client_Search(Req->prefix);
 729                         else
 730                                 from = Client;
 731                         if (!from)
 732                                 return IRC_WriteErrClient(Client,
 733                                                 ERR_NOSUCHSERVER_MSG,
 734                                                 Client_ID(Client), Req->prefix);
 735
 736                         return IRC_WriteStrClientPrefix(target, from,
 737                                         "PING %s :%s", Req->argv[0],
 738                                         Req->argv[1] );
 739                 }
 740         }
 741
 742         if (Client_Type(Client) == CLIENT_SERVER) {
 743                 if (Req->prefix)
 744                         from = Client_Search(Req->prefix);
 745                 else
 746                         from = Client;
 747         } else
 748                 from = Client_ThisServer();
 749         if (!from)
 750                 return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 751                                         Client_ID(Client), Req->prefix);
 752
 753         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 754             Client_Conn(Client));
 755
 756 #ifdef STRICT_RFC
 757         return IRC_WriteStrClient(Client, "PONG %s :%s",
 758                 Client_ID(from), Client_ID(Client));
 759 #else
 760         /* Some clients depend on the argument being returned in the PONG
 761          * reply (not mentioned in any RFC, though) */
 762         return IRC_WriteStrClient(Client, "PONG %s :%s",
 763                 Client_ID(from), Req->argv[0]);
 764 #endif
 765 } /* IRC_PING */
 766
 767 /**
 768  * Handler for the IRC "PONG" command.
 769  *
 770  * @param Client The client from which this command has been received.
 771  * @param Req Request structure with prefix and all parameters.
 772  * @return CONNECTED or DISCONNECTED.
 773  */
 774 GLOBAL bool
 775 IRC_PONG(CLIENT *Client, REQUEST *Req)
 776 {
 777         CLIENT *target, *from;
 778         CONN_ID conn;
 779 #ifndef STRICT_RFC
 780         long auth_ping;
 781 #endif
 782         char *s;
 783
 784         assert(Client != NULL);
 785         assert(Req != NULL);
 786
 787         /* Wrong number of arguments? */
 788         if (Req->argc < 1) {
 789                 if (Client_Type(Client) == CLIENT_USER)
 790                         return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 791                                                   Client_ID(Client));
 792                 else
 793                         return CONNECTED;
 794         }
 795         if (Client_Type(Client) == CLIENT_USER) {
 796                 _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 797         }
 798
 799         /* Forward? */
 800         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 801                 target = Client_Search(Req->argv[0]);
 802                 if (!target)
 803                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 804                                         Client_ID(Client), Req->argv[0]);
 805
 806                 from = Client_Search(Req->prefix);
 807
 808                 if (target != Client_ThisServer() && target != from) {
 809                         /* Ok, we have to forward the message. */
 810                         if (!from)
 811                                 return IRC_WriteErrClient(Client,
 812                                                 ERR_NOSUCHSERVER_MSG,
 813                                                 Client_ID(Client), Req->prefix);
 814
 815                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 816                                 s = Client_ID(from);
 817                         else
 818                                 s = Req->argv[0];
 819                         return IRC_WriteStrClientPrefix(target, from,
 820                                  "PONG %s :%s", s, Req->argv[1]);
 821                 }
 822         }
 823
 824         /* The connection timestamp has already been updated when the data has
 825          * been read from so socket, so we don't need to update it here. */
 826
 827         conn = Client_Conn(Client);
 828
 829 #ifndef STRICT_RFC
 830         /* Check authentication PING-PONG ... */
 831         auth_ping = Conn_GetAuthPing(conn);
 832         if (auth_ping) {
 833                 LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
 834                          auth_ping, Req->argv[0]);
 835                 if (auth_ping == atoi(Req->argv[0])) {
 836                         Conn_SetAuthPing(conn, 0);
 837                         if (Client_Type(Client) == CLIENT_WAITAUTHPING)
 838                                 Login_User(Client);
 839                 } else
 840                         if (!IRC_WriteStrClient(Client,
 841                                         "To connect, type /QUOTE PONG %ld",
 842                                         auth_ping))
 843                                 return DISCONNECTED;
 844         }
 845 #endif
 846
 847         if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
 848                 Log(LOG_INFO,
 849                     "Synchronization with \"%s\" done (connection %d): %ld second%s [%ld users, %ld channels].",
 850                     Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
 851                     time(NULL) - Conn_GetSignon(conn) == 1 ? "" : "s",
 852                     Client_UserCount(), Channel_CountVisible(NULL));
 853                 Conn_UpdatePing(conn);
 854         } else
 855                 LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
 856                          conn, time(NULL) - Conn_LastPing(conn));
 857
 858         return CONNECTED;
 859 } /* IRC_PONG */
 860
 861 /**
 862  * Change the nickname of a client.
 863  *
 864  * @param Origin The client which caused the nickname change.
 865  * @param Target The client of which the nickname should be changed.
 866  * @param NewNick The new nickname.
 867  */
 868 static void
 869 Change_Nick(CLIENT *Origin, CLIENT *Target, char *NewNick, bool InformClient)
 870 {
 871         if (Client_Conn(Target) > NONE) {
 872                 /* Local client */
 873                 Log(LOG_INFO,
 874                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 875                     Client_TypeText(Target), Client_Mask(Target),
 876                     Client_Conn(Target), Client_ID(Target), NewNick);
 877                 Conn_UpdateIdle(Client_Conn(Target));
 878         } else {
 879                 /* Remote client */
 880                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 881                          Client_TypeText(Target),
 882                          Client_Mask(Target), Client_ID(Target), NewNick);
 883         }
 884
 885         /* Inform all servers and users (which have to know) of the new name */
 886         if (InformClient) {
 887                 IRC_WriteStrClientPrefix(Target, Target, "NICK :%s", NewNick);
 888                 IRC_WriteStrServersPrefix(NULL, Target, "NICK :%s", NewNick);
 889         } else
 890                 IRC_WriteStrServersPrefix(Origin, Target, "NICK :%s", NewNick);
 891         IRC_WriteStrRelatedPrefix(Target, Target, false, "NICK :%s", NewNick);
 892
 893         /* Register old nickname for WHOWAS queries */
 894         Client_RegisterWhowas(Target);
 895
 896         /* Save new nickname */
 897         Client_SetID(Target, NewNick);
 898 }
 899
 900 /* -eof- */