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         CHANNEL *chan;
 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                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 1)
 196
 197                 /* Search "target" client */
 198                 if (Client_Type(Client) == CLIENT_SERVER) {
 199                         target = Client_Search(Req->prefix);
 200                         if (!target)
 201                                 return IRC_WriteErrClient(Client,
 202                                                           ERR_NOSUCHNICK_MSG,
 203                                                           Client_ID(Client),
 204                                                           Req->argv[0]);
 205                 } else {
 206                         /* Is this a restricted client? */
 207                         if (Client_HasMode(Client, 'r'))
 208                                 return IRC_WriteErrClient(Client,
 209                                                           ERR_RESTRICTED_MSG,
 210                                                           Client_ID(Client));
 211                         target = Client;
 212                 }
 213
 214 #ifndef STRICT_RFC
 215                 /* If the clients tries to change to its own nickname we won't
 216                  * do anything. This is how the original ircd behaves and some
 217                  * clients (for example Snak) expect it to be like this.
 218                  * But I doubt that this is "really the right thing" ... */
 219                 if (strcmp(Client_ID(target), Req->argv[0]) == 0)
 220                         return CONNECTED;
 221 #endif
 222
 223                 /* Check that the new nickname is available. Special case:
 224                  * the client only changes from/to upper to lower case. */
 225                 if (strcasecmp(Client_ID(target), Req->argv[0]) != 0) {
 226                         if (!Client_CheckNick(target, Req->argv[0]))
 227                                 return CONNECTED;
 228                 }
 229
 230                 if (Client_Type(target) != CLIENT_USER &&
 231                     Client_Type(target) != CLIENT_SERVICE &&
 232                     Client_Type(target) != CLIENT_SERVER) {
 233                         /* New client */
 234                         LogDebug("Connection %d: got valid NICK command ...",
 235                              Client_Conn( Client ));
 236
 237                         /* Register new nickname of this client */
 238                         Client_SetID( target, Req->argv[0] );
 239
 240 #ifndef STRICT_RFC
 241                         if (Conf_AuthPing) {
 242 #ifdef HAVE_ARC4RANDOM
 243                                 Conn_SetAuthPing(Client_Conn(Client), arc4random());
 244 #else
 245                                 Conn_SetAuthPing(Client_Conn(Client), rand());
 246 #endif
 247                                 Conn_WriteStr(Client_Conn(Client), "PING :%ld",
 248                                         Conn_GetAuthPing(Client_Conn(Client)));
 249                                 LogDebug("Connection %d: sent AUTH PING %ld ...",
 250                                         Client_Conn(Client),
 251                                         Conn_GetAuthPing(Client_Conn(Client)));
 252                         }
 253 #endif
 254
 255                         /* If we received a valid USER command already then
 256                          * register the new client! */
 257                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 258                                 return Login_User( Client );
 259                         else
 260                                 Client_SetType( Client, CLIENT_GOTNICK );
 261                 } else {
 262                         /* Nickname change */
 263
 264                         /* Check that the user isn't on any channels set +N */
 265                         chan = Channel_First();
 266                         while (chan) {
 267                                 if(Channel_IsMemberOf(chan, Client) &&
 268                                    Channel_HasMode(chan, 'N') &&
 269                                    !Client_HasMode(Client, 'o'))
 270                                         return IRC_WriteErrClient(Client,
 271                                                                   ERR_NONICKCHANGE_MSG,
 272                                                                   Client_ID(Client),
 273                                                                   Channel_Name(chan));
 274                                 chan = Channel_Next(chan);
 275                         }
 276
 277                         Change_Nick(Client, target, Req->argv[0],
 278                                     Client_Type(Client) == CLIENT_USER ? true : false);
 279                         IRC_SetPenalty(target, 2);
 280                 }
 281
 282                 return CONNECTED;
 283         } else if(Client_Type(Client) == CLIENT_SERVER ||
 284                   Client_Type(Client) == CLIENT_SERVICE) {
 285                 /* Server or service introduces new client */
 286
 287                 /* Bad number of parameters? */
 288                 if (Req->argc != 2 && Req->argc != 7)
 289                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 290                                                   Client_ID(Client), Req->command);
 291
 292                 if (Req->argc >= 7) {
 293                         /* RFC 2813 compatible syntax */
 294                         nick = Req->argv[0];
 295                         hops = atoi(Req->argv[1]);
 296                         user = Req->argv[2];
 297                         hostname = Req->argv[3];
 298                         token = atoi(Req->argv[4]);
 299                         modes = Req->argv[5] + 1;
 300                         info = Req->argv[6];
 301                 } else {
 302                         /* RFC 1459 compatible syntax */
 303                         nick = Req->argv[0];
 304                         hops = 1;
 305                         user = Req->argv[0];
 306                         hostname = Client_ID(Client);
 307                         token = atoi(Req->argv[1]);
 308                         modes = "";
 309                         info = Req->argv[0];
 310                 }
 311
 312                 c = Client_Search(nick);
 313                 if(c) {
 314                         /*
 315                          * the new nick is already present on this server:
 316                          * the new and the old one have to be disconnected now.
 317                          */
 318                         Log(LOG_ERR,
 319                             "Server %s introduces already registered nick \"%s\"!",
 320                             Client_ID(Client), Req->argv[0]);
 321                         return IRC_KillClient(Client, NULL, Req->argv[0],
 322                                               "Nick collision");
 323                 }
 324
 325                 /* Find the Server this client is connected to */
 326                 intr_c = Client_GetFromToken(Client, token);
 327                 if (!intr_c) {
 328                         Log(LOG_ERR,
 329                             "Server %s introduces nick \"%s\" on unknown server!?",
 330                             Client_ID(Client), Req->argv[0]);
 331                         return IRC_KillClient(Client, NULL, Req->argv[0],
 332                                               "Unknown server");
 333                 }
 334
 335                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 336                                          token, modes, info, true);
 337                 if (!c) {
 338                         /* Out of memory, we need to disconnect client to keep
 339                          * network state consistent! */
 340                         Log(LOG_ALERT,
 341                             "Can't create client structure! (on connection %d)",
 342                             Client_Conn(Client));
 343                         return IRC_KillClient(Client, NULL, Req->argv[0],
 344                                               "Server error");
 345                 }
 346
 347                 /* RFC 2813: client is now fully registered, inform all the
 348                  * other servers about the new user.
 349                  * RFC 1459: announce the new client only after receiving the
 350                  * USER command, first we need more information! */
 351                 if (Req->argc < 7) {
 352                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 353                                  Client_Mask(c));
 354                         Client_SetType(c, CLIENT_GOTNICK);
 355                 } else
 356                         Client_Introduce(Client, c, CLIENT_USER);
 357
 358                 return CONNECTED;
 359         }
 360         else
 361                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 362                                           Client_ID(Client));
 363 } /* IRC_NICK */
 364
 365 /**
 366  * Handler for the IRC "SVSNICK" command.
 367  *
 368  * @param Client The client from which this command has been received.
 369  * @param Req Request structure with prefix and all parameters.
 370  * @return CONNECTED or DISCONNECTED.
 371  */
 372 GLOBAL bool
 373 IRC_SVSNICK(CLIENT *Client, REQUEST *Req)
 374 {
 375         CLIENT *from, *target;
 376
 377         assert(Client != NULL);
 378         assert(Req != NULL);
 379
 380         /* Search the originator */
 381         from = Client_Search(Req->prefix);
 382         if (!from)
 383                 from = Client;
 384
 385         /* Search the target */
 386         target = Client_Search(Req->argv[0]);
 387         if (!target || Client_Type(target) != CLIENT_USER)
 388                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 389                                           Client_ID(Client), Req->argv[0]);
 390
 391         if (Client_Conn(target) <= NONE) {
 392                 /* We have to forward the message to the server handling
 393                  * this user; this is required to make sure all servers
 394                  * in the network do follow the nick name change! */
 395                 return IRC_WriteStrClientPrefix(Client_NextHop(target), from,
 396                                                 "SVSNICK %s %s",
 397                                                 Req->argv[0], Req->argv[1]);
 398         }
 399
 400         /* Make sure that the new nickname is valid */
 401         if (!Client_CheckNick(from, Req->argv[1]))
 402                 return CONNECTED;
 403
 404         Change_Nick(from, target, Req->argv[1], true);
 405         return CONNECTED;
 406 }
 407
 408 /**
 409  * Handler for the IRC "USER" command.
 410  *
 411  * @param Client The client from which this command has been received.
 412  * @param Req Request structure with prefix and all parameters.
 413  * @return CONNECTED or DISCONNECTED.
 414  */
 415 GLOBAL bool
 416 IRC_USER(CLIENT * Client, REQUEST * Req)
 417 {
 418         CLIENT *c;
 419         char *ptr;
 420
 421         assert(Client != NULL);
 422         assert(Req != NULL);
 423
 424         if (Client_Type(Client) == CLIENT_GOTNICK ||
 425 #ifndef STRICT_RFC
 426             Client_Type(Client) == CLIENT_UNKNOWN ||
 427 #endif
 428             Client_Type(Client) == CLIENT_GOTPASS)
 429         {
 430                 /* New connection */
 431                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 432
 433                 /* User name: only alphanumeric characters and limited
 434                    punctuation is allowed.*/
 435                 ptr = Req->argv[0];
 436                 while (*ptr) {
 437                         if (!isalnum((int)*ptr) &&
 438                             *ptr != '+' && *ptr != '-' && *ptr != '@' &&
 439                             *ptr != '.' && *ptr != '_') {
 440                                 Conn_Close(Client_Conn(Client), NULL,
 441                                            "Invalid user name", true);
 442                                 return DISCONNECTED;
 443                         }
 444                         ptr++;
 445                 }
 446
 447                 /* Save the received username for authentication, and use
 448                  * it up to the first '@' as default user name (like ircd2.11,
 449                  * bahamut, ircd-seven, ...), prefixed with '~', if needed: */
 450                 Client_SetOrigUser(Client, Req->argv[0]);
 451                 ptr = strchr(Req->argv[0], '@');
 452                 if (ptr)
 453                         *ptr = '\0';
 454 #ifdef IDENTAUTH
 455                 ptr = Client_User(Client);
 456                 if (!ptr || !*ptr || *ptr == '~')
 457                         Client_SetUser(Client, Req->argv[0], false);
 458 #else
 459                 Client_SetUser(Client, Req->argv[0], false);
 460 #endif
 461
 462                 /* "Real name" or user info text: Don't set it to the empty
 463                  * string, the original ircd can't deal with such "real names"
 464                  * (e. g. "USER user * * :") ... */
 465                 if (*Req->argv[3])
 466                         Client_SetInfo(Client, Req->argv[3]);
 467                 else
 468                         Client_SetInfo(Client, "-");
 469
 470                 LogDebug("Connection %d: got valid USER command ...",
 471                     Client_Conn(Client));
 472                 if (Client_Type(Client) == CLIENT_GOTNICK)
 473                         return Login_User(Client);
 474                 else
 475                         Client_SetType(Client, CLIENT_GOTUSER);
 476                 return CONNECTED;
 477
 478         } else if (Client_Type(Client) == CLIENT_SERVER ||
 479                    Client_Type(Client) == CLIENT_SERVICE) {
 480                 /* Server/service updating an user */
 481                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 482
 483                 c = Client_Search(Req->prefix);
 484                 if (!c)
 485                         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 486                                                   Client_ID(Client),
 487                                                   Req->prefix);
 488
 489                 Client_SetUser(c, Req->argv[0], true);
 490                 Client_SetOrigUser(c, Req->argv[0]);
 491                 Client_SetHostname(c, Req->argv[1]);
 492                 Client_SetInfo(c, Req->argv[3]);
 493
 494                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 495                          Client_Conn(Client), Client_Mask(c));
 496
 497                 /* RFC 1459 style user registration?
 498                  * Introduce client to network: */
 499                 if (Client_Type(c) == CLIENT_GOTNICK)
 500                         Client_Introduce(Client, c, CLIENT_USER);
 501
 502                 return CONNECTED;
 503         } else if (Client_Type(Client) == CLIENT_USER) {
 504                 /* Already registered connection */
 505                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 506                                           Client_ID(Client));
 507         } else {
 508                 /* Unexpected/invalid connection state? */
 509                 return IRC_WriteErrClient(Client, ERR_NOTREGISTERED_MSG,
 510                                           Client_ID(Client));
 511         }
 512 } /* IRC_USER */
 513
 514 /**
 515  * Handler for the IRC "SERVICE" command.
 516  *
 517  * At the moment ngIRCd doesn't support directly linked services, so this
 518  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 519  * received from a peer server.
 520  *
 521  * @param Client The client from which this command has been received.
 522  * @param Req Request structure with prefix and all parameters.
 523  * @return CONNECTED or DISCONNECTED.
 524  */
 525 GLOBAL bool
 526 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 527 {
 528         CLIENT *c, *intr_c;
 529         char *nick, *user, *host, *info, *modes, *ptr;
 530         int token, hops;
 531
 532         assert(Client != NULL);
 533         assert(Req != NULL);
 534
 535         if (Client_Type(Client) != CLIENT_GOTPASS &&
 536             Client_Type(Client) != CLIENT_SERVER)
 537                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 538                                           Client_ID(Client));
 539
 540         if (Client_Type(Client) != CLIENT_SERVER)
 541                 return IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 542                                   Client_ID(Client), Req->argv[0]);
 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 ("nickname") */
 551         c = Client_Search(nick);
 552         if(c) {
 553                 /* Nickname collision: disconnect (KILL) both clients! */
 554                 Log(LOG_ERR,
 555                     "Server %s introduces already registered service \"%s\"!",
 556                     Client_ID(Client), nick);
 557                 return IRC_KillClient(Client, NULL, nick, "Nick collision");
 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,
 564                     "Server %s introduces service \"%s\" on unknown server!?",
 565                     Client_ID(Client), nick);
 566                 return IRC_KillClient(Client, NULL, nick, "Unknown server");
 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,
 596                     "Can't create client structure! (on connection %d)",
 597                     Client_Conn(Client));
 598                 return IRC_KillClient(Client, NULL, nick, "Server error");
 599         }
 600
 601         Client_Introduce(Client, c, CLIENT_SERVICE);
 602         return CONNECTED;
 603 } /* IRC_SERVICE */
 604
 605 /**
 606  * Handler for the IRC "WEBIRC" command.
 607  *
 608  * @param Client The client from which this command has been received.
 609  * @param Req Request structure with prefix and all parameters.
 610  * @return CONNECTED or DISCONNECTED.
 611  */
 612 GLOBAL bool
 613 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 614 {
 615         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 616                 return IRC_WriteErrClient(Client, ERR_PASSWDMISMATCH_MSG,
 617                                           Client_ID(Client));
 618
 619         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 620                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 621
 622         Client_SetUser(Client, Req->argv[1], true);
 623         Client_SetOrigUser(Client, Req->argv[1]);
 624         if (Conf_DNS)
 625                 Client_SetHostname(Client, Req->argv[2]);
 626         else
 627                 Client_SetHostname(Client, Req->argv[3]);
 628         Client_SetIPAText(Client, Req->argv[3]);
 629
 630         return CONNECTED;
 631 } /* IRC_WEBIRC */
 632
 633 /**
 634  * Handler for the IRC "QUIT" command.
 635  *
 636  * @param Client The client from which this command has been received.
 637  * @param Req Request structure with prefix and all parameters.
 638  * @return CONNECTED or DISCONNECTED.
 639  */
 640 GLOBAL bool
 641 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 642 {
 643         CLIENT *target;
 644         char quitmsg[COMMAND_LEN];
 645
 646         assert(Client != NULL);
 647         assert(Req != NULL);
 648
 649         if (Req->argc == 1)
 650                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 651
 652         if (Client_Type(Client) == CLIENT_SERVER) {
 653                 /* Server */
 654                 target = Client_Search(Req->prefix);
 655                 if (!target) {
 656                         Log(LOG_WARNING,
 657                             "Got QUIT from %s for unknown client!?",
 658                             Client_ID(Client));
 659                         return CONNECTED;
 660                 }
 661
 662                 if (target != Client) {
 663                         Client_Destroy(target, "Got QUIT command",
 664                                        Req->argc == 1 ? quitmsg : NULL, true);
 665                         return CONNECTED;
 666                 } else {
 667                         Conn_Close(Client_Conn(Client), "Got QUIT command",
 668                                    Req->argc == 1 ? quitmsg : NULL, true);
 669                         return DISCONNECTED;
 670                 }
 671         } else {
 672                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 673                         /* " " to avoid confusion */
 674                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 675                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 676                         strlcat(quitmsg, "\"", sizeof quitmsg );
 677                 }
 678
 679                 /* User, Service, or not yet registered */
 680                 Conn_Close(Client_Conn(Client), "Got QUIT command",
 681                            Req->argc == 1 ? quitmsg : NULL, true);
 682
 683                 return DISCONNECTED;
 684         }
 685 } /* IRC_QUIT */
 686
 687 #ifndef STRICT_RFC
 688
 689 /**
 690  * Handler for HTTP command, e.g. GET and POST
 691  *
 692  * We handle these commands here to avoid the quite long timeout when
 693  * some user tries to access this IRC daemon using an web browser ...
 694  *
 695  * @param Client The client from which this command has been received.
 696  * @param Req Request structure with prefix and all parameters.
 697  * @return CONNECTED or DISCONNECTED.
 698  */
 699 GLOBAL bool
 700 IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
 701 {
 702         Req->argc = 1;
 703         Req->argv[0] = "Oops, HTTP request received? This is IRC!";
 704         return IRC_QUIT(Client, Req);
 705 } /* IRC_QUIT_HTTP */
 706
 707 #endif
 708
 709 /**
 710  * Handler for the IRC "PING" command.
 711  *
 712  * @param Client The client from which this command has been received.
 713  * @param Req Request structure with prefix and all parameters.
 714  * @return CONNECTED or DISCONNECTED.
 715  */
 716 GLOBAL bool
 717 IRC_PING(CLIENT *Client, REQUEST *Req)
 718 {
 719         CLIENT *target, *from;
 720
 721         assert(Client != NULL);
 722         assert(Req != NULL);
 723
 724         if (Req->argc < 1)
 725                 return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 726                                           Client_ID(Client));
 727 #ifdef STRICT_RFC
 728         /* Don't ignore additional arguments when in "strict" mode */
 729         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 730 #endif
 731
 732         if (Req->argc > 1) {
 733                 /* A target has been specified ... */
 734                 target = Client_Search(Req->argv[1]);
 735
 736                 if (!target || Client_Type(target) != CLIENT_SERVER)
 737                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 738                                         Client_ID(Client), Req->argv[1]);
 739
 740                 if (target != Client_ThisServer()) {
 741                         /* Ok, we have to forward the PING */
 742                         if (Client_Type(Client) == CLIENT_SERVER)
 743                                 from = Client_Search(Req->prefix);
 744                         else
 745                                 from = Client;
 746                         if (!from)
 747                                 return IRC_WriteErrClient(Client,
 748                                                 ERR_NOSUCHSERVER_MSG,
 749                                                 Client_ID(Client), Req->prefix);
 750
 751                         return IRC_WriteStrClientPrefix(target, from,
 752                                         "PING %s :%s", Req->argv[0],
 753                                         Req->argv[1] );
 754                 }
 755         }
 756
 757         if (Client_Type(Client) == CLIENT_SERVER) {
 758                 if (Req->prefix)
 759                         from = Client_Search(Req->prefix);
 760                 else
 761                         from = Client;
 762         } else
 763                 from = Client_ThisServer();
 764         if (!from)
 765                 return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 766                                         Client_ID(Client), Req->prefix);
 767
 768         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 769             Client_Conn(Client));
 770
 771 #ifdef STRICT_RFC
 772         return IRC_WriteStrClient(Client, "PONG %s :%s",
 773                 Client_ID(from), Client_ID(Client));
 774 #else
 775         /* Some clients depend on the argument being returned in the PONG
 776          * reply (not mentioned in any RFC, though) */
 777         return IRC_WriteStrClient(Client, "PONG %s :%s",
 778                 Client_ID(from), Req->argv[0]);
 779 #endif
 780 } /* IRC_PING */
 781
 782 /**
 783  * Handler for the IRC "PONG" command.
 784  *
 785  * @param Client The client from which this command has been received.
 786  * @param Req Request structure with prefix and all parameters.
 787  * @return CONNECTED or DISCONNECTED.
 788  */
 789 GLOBAL bool
 790 IRC_PONG(CLIENT *Client, REQUEST *Req)
 791 {
 792         CLIENT *target, *from;
 793         CONN_ID conn;
 794 #ifndef STRICT_RFC
 795         long auth_ping;
 796 #endif
 797         char *s;
 798
 799         assert(Client != NULL);
 800         assert(Req != NULL);
 801
 802         /* Wrong number of arguments? */
 803         if (Req->argc < 1) {
 804                 if (Client_Type(Client) == CLIENT_USER)
 805                         return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 806                                                   Client_ID(Client));
 807                 else
 808                         return CONNECTED;
 809         }
 810         if (Client_Type(Client) == CLIENT_USER) {
 811                 _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 812         }
 813
 814         /* Forward? */
 815         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 816                 target = Client_Search(Req->argv[0]);
 817                 if (!target)
 818                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 819                                         Client_ID(Client), Req->argv[0]);
 820
 821                 from = Client_Search(Req->prefix);
 822
 823                 if (target != Client_ThisServer() && target != from) {
 824                         /* Ok, we have to forward the message. */
 825                         if (!from)
 826                                 return IRC_WriteErrClient(Client,
 827                                                 ERR_NOSUCHSERVER_MSG,
 828                                                 Client_ID(Client), Req->prefix);
 829
 830                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 831                                 s = Client_ID(from);
 832                         else
 833                                 s = Req->argv[0];
 834                         return IRC_WriteStrClientPrefix(target, from,
 835                                  "PONG %s :%s", s, Req->argv[1]);
 836                 }
 837         }
 838
 839         /* The connection timestamp has already been updated when the data has
 840          * been read from so socket, so we don't need to update it here. */
 841
 842         conn = Client_Conn(Client);
 843
 844 #ifndef STRICT_RFC
 845         /* Check authentication PING-PONG ... */
 846         auth_ping = Conn_GetAuthPing(conn);
 847         if (auth_ping) {
 848                 LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
 849                          auth_ping, Req->argv[0]);
 850                 if (auth_ping == atol(Req->argv[0])) {
 851                         Conn_SetAuthPing(conn, 0);
 852                         if (Client_Type(Client) == CLIENT_WAITAUTHPING)
 853                                 Login_User(Client);
 854                 } else
 855                         if (!IRC_WriteStrClient(Client,
 856                                         "NOTICE %s :To connect, type /QUOTE PONG %ld",
 857                                         Client_ID(Client), auth_ping))
 858                                 return DISCONNECTED;
 859         }
 860 #endif
 861
 862         if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
 863                 Log(LOG_INFO,
 864                     "Synchronization with \"%s\" done (connection %d): %ld second%s [%ld users, %ld channels].",
 865                     Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
 866                     time(NULL) - Conn_GetSignon(conn) == 1 ? "" : "s",
 867                     Client_UserCount(), Channel_CountVisible(NULL));
 868                 Conn_UpdatePing(conn);
 869         } else
 870                 LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
 871                          conn, time(NULL) - Conn_LastPing(conn));
 872
 873         return CONNECTED;
 874 } /* IRC_PONG */
 875
 876 /**
 877  * Change the nickname of a client.
 878  *
 879  * @param Origin The client which caused the nickname change.
 880  * @param Target The client of which the nickname should be changed.
 881  * @param NewNick The new nickname.
 882  */
 883 static void
 884 Change_Nick(CLIENT *Origin, CLIENT *Target, char *NewNick, bool InformClient)
 885 {
 886         if (Client_Conn(Target) > NONE) {
 887                 /* Local client */
 888                 Log(LOG_INFO,
 889                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 890                     Client_TypeText(Target), Client_Mask(Target),
 891                     Client_Conn(Target), Client_ID(Target), NewNick);
 892                 Conn_UpdateIdle(Client_Conn(Target));
 893         } else {
 894                 /* Remote client */
 895                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 896                          Client_TypeText(Target),
 897                          Client_Mask(Target), Client_ID(Target), NewNick);
 898         }
 899
 900         /* Inform all servers and users (which have to know) of the new name */
 901         if (InformClient) {
 902                 IRC_WriteStrClientPrefix(Target, Target, "NICK :%s", NewNick);
 903                 IRC_WriteStrServersPrefix(NULL, Target, "NICK :%s", NewNick);
 904         } else
 905                 IRC_WriteStrServersPrefix(Origin, Target, "NICK :%s", NewNick);
 906         IRC_WriteStrRelatedPrefix(Target, Target, false, "NICK :%s", NewNick);
 907
 908         /* Register old nickname for WHOWAS queries */
 909         Client_RegisterWhowas(Target);
 910
 911         /* Save new nickname */
 912         Client_SetID(Target, NewNick);
 913 }
 914
 915 /* -eof- */