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                         if(!Client_HasMode(Client, 'o')) {
 266                                 chan = Channel_First();
 267                                 while (chan) {
 268                                         if(Channel_IsMemberOf(chan, Client) &&
 269                                            Channel_HasMode(chan, 'N'))
 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
 278                         Change_Nick(Client, target, Req->argv[0],
 279                                     Client_Type(Client) == CLIENT_USER ? true : false);
 280                         IRC_SetPenalty(target, 2);
 281                 }
 282
 283                 return CONNECTED;
 284         } else if(Client_Type(Client) == CLIENT_SERVER ||
 285                   Client_Type(Client) == CLIENT_SERVICE) {
 286                 /* Server or service introduces new client */
 287
 288                 /* Bad number of parameters? */
 289                 if (Req->argc != 2 && Req->argc != 7)
 290                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 291                                                   Client_ID(Client), Req->command);
 292
 293                 if (Req->argc >= 7) {
 294                         /* RFC 2813 compatible syntax */
 295                         nick = Req->argv[0];
 296                         hops = atoi(Req->argv[1]);
 297                         user = Req->argv[2];
 298                         hostname = Req->argv[3];
 299                         token = atoi(Req->argv[4]);
 300                         modes = Req->argv[5] + 1;
 301                         info = Req->argv[6];
 302                 } else {
 303                         /* RFC 1459 compatible syntax */
 304                         nick = Req->argv[0];
 305                         hops = 1;
 306                         user = Req->argv[0];
 307                         hostname = Client_ID(Client);
 308                         token = atoi(Req->argv[1]);
 309                         modes = "";
 310                         info = Req->argv[0];
 311                 }
 312
 313                 c = Client_Search(nick);
 314                 if(c) {
 315                         /*
 316                          * the new nick is already present on this server:
 317                          * the new and the old one have to be disconnected now.
 318                          */
 319                         Log(LOG_ERR,
 320                             "Server %s introduces already registered nick \"%s\"!",
 321                             Client_ID(Client), Req->argv[0]);
 322                         return IRC_KillClient(Client, NULL, Req->argv[0],
 323                                               "Nick collision");
 324                 }
 325
 326                 /* Find the Server this client is connected to */
 327                 intr_c = Client_GetFromToken(Client, token);
 328                 if (!intr_c) {
 329                         Log(LOG_ERR,
 330                             "Server %s introduces nick \"%s\" on unknown server!?",
 331                             Client_ID(Client), Req->argv[0]);
 332                         return IRC_KillClient(Client, NULL, Req->argv[0],
 333                                               "Unknown server");
 334                 }
 335
 336                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 337                                          token, modes, info, true);
 338                 if (!c) {
 339                         /* Out of memory, we need to disconnect client to keep
 340                          * network state consistent! */
 341                         Log(LOG_ALERT,
 342                             "Can't create client structure! (on connection %d)",
 343                             Client_Conn(Client));
 344                         return IRC_KillClient(Client, NULL, Req->argv[0],
 345                                               "Server error");
 346                 }
 347
 348                 /* RFC 2813: client is now fully registered, inform all the
 349                  * other servers about the new user.
 350                  * RFC 1459: announce the new client only after receiving the
 351                  * USER command, first we need more information! */
 352                 if (Req->argc < 7) {
 353                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 354                                  Client_Mask(c));
 355                         Client_SetType(c, CLIENT_GOTNICK);
 356                 } else
 357                         Client_Introduce(Client, c, CLIENT_USER);
 358
 359                 return CONNECTED;
 360         }
 361         else
 362                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 363                                           Client_ID(Client));
 364 } /* IRC_NICK */
 365
 366 /**
 367  * Handler for the IRC "SVSNICK" command.
 368  *
 369  * @param Client The client from which this command has been received.
 370  * @param Req Request structure with prefix and all parameters.
 371  * @return CONNECTED or DISCONNECTED.
 372  */
 373 GLOBAL bool
 374 IRC_SVSNICK(CLIENT *Client, REQUEST *Req)
 375 {
 376         CLIENT *from, *target;
 377
 378         assert(Client != NULL);
 379         assert(Req != NULL);
 380
 381         /* Search the originator */
 382         from = Client_Search(Req->prefix);
 383         if (!from)
 384                 from = Client;
 385
 386         /* Search the target */
 387         target = Client_Search(Req->argv[0]);
 388         if (!target || Client_Type(target) != CLIENT_USER)
 389                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 390                                           Client_ID(Client), Req->argv[0]);
 391
 392         if (Client_Conn(target) <= NONE) {
 393                 /* We have to forward the message to the server handling
 394                  * this user; this is required to make sure all servers
 395                  * in the network do follow the nick name change! */
 396                 return IRC_WriteStrClientPrefix(Client_NextHop(target), from,
 397                                                 "SVSNICK %s %s",
 398                                                 Req->argv[0], Req->argv[1]);
 399         }
 400
 401         /* Make sure that the new nickname is valid */
 402         if (!Client_CheckNick(from, Req->argv[1]))
 403                 return CONNECTED;
 404
 405         Change_Nick(from, target, Req->argv[1], true);
 406         return CONNECTED;
 407 }
 408
 409 /**
 410  * Handler for the IRC "USER" command.
 411  *
 412  * @param Client The client from which this command has been received.
 413  * @param Req Request structure with prefix and all parameters.
 414  * @return CONNECTED or DISCONNECTED.
 415  */
 416 GLOBAL bool
 417 IRC_USER(CLIENT * Client, REQUEST * Req)
 418 {
 419         CLIENT *c;
 420         char *ptr;
 421
 422         assert(Client != NULL);
 423         assert(Req != NULL);
 424
 425         if (Client_Type(Client) == CLIENT_GOTNICK ||
 426 #ifndef STRICT_RFC
 427             Client_Type(Client) == CLIENT_UNKNOWN ||
 428 #endif
 429             Client_Type(Client) == CLIENT_GOTPASS)
 430         {
 431                 /* New connection */
 432                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 433
 434                 /* User name: only alphanumeric characters and limited
 435                    punctuation is allowed.*/
 436                 ptr = Req->argv[0];
 437                 while (*ptr) {
 438                         if (!isalnum((int)*ptr) &&
 439                             *ptr != '+' && *ptr != '-' && *ptr != '@' &&
 440                             *ptr != '.' && *ptr != '_') {
 441                                 Conn_Close(Client_Conn(Client), NULL,
 442                                            "Invalid user name", true);
 443                                 return DISCONNECTED;
 444                         }
 445                         ptr++;
 446                 }
 447
 448                 /* Save the received username for authentication, and use
 449                  * it up to the first '@' as default user name (like ircd2.11,
 450                  * bahamut, ircd-seven, ...), prefixed with '~', if needed: */
 451                 Client_SetOrigUser(Client, Req->argv[0]);
 452                 ptr = strchr(Req->argv[0], '@');
 453                 if (ptr)
 454                         *ptr = '\0';
 455 #ifdef IDENTAUTH
 456                 ptr = Client_User(Client);
 457                 if (!ptr || !*ptr || *ptr == '~')
 458                         Client_SetUser(Client, Req->argv[0], false);
 459 #else
 460                 Client_SetUser(Client, Req->argv[0], false);
 461 #endif
 462
 463                 /* "Real name" or user info text: Don't set it to the empty
 464                  * string, the original ircd can't deal with such "real names"
 465                  * (e. g. "USER user * * :") ... */
 466                 if (*Req->argv[3])
 467                         Client_SetInfo(Client, Req->argv[3]);
 468                 else
 469                         Client_SetInfo(Client, "-");
 470
 471                 LogDebug("Connection %d: got valid USER command ...",
 472                     Client_Conn(Client));
 473                 if (Client_Type(Client) == CLIENT_GOTNICK)
 474                         return Login_User(Client);
 475                 else
 476                         Client_SetType(Client, CLIENT_GOTUSER);
 477                 return CONNECTED;
 478
 479         } else if (Client_Type(Client) == CLIENT_SERVER ||
 480                    Client_Type(Client) == CLIENT_SERVICE) {
 481                 /* Server/service updating an user */
 482                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 483
 484                 c = Client_Search(Req->prefix);
 485                 if (!c)
 486                         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 487                                                   Client_ID(Client),
 488                                                   Req->prefix);
 489
 490                 Client_SetUser(c, Req->argv[0], true);
 491                 Client_SetOrigUser(c, Req->argv[0]);
 492                 Client_SetHostname(c, Req->argv[1]);
 493                 Client_SetInfo(c, Req->argv[3]);
 494
 495                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 496                          Client_Conn(Client), Client_Mask(c));
 497
 498                 /* RFC 1459 style user registration?
 499                  * Introduce client to network: */
 500                 if (Client_Type(c) == CLIENT_GOTNICK)
 501                         Client_Introduce(Client, c, CLIENT_USER);
 502
 503                 return CONNECTED;
 504         } else if (Client_Type(Client) == CLIENT_USER) {
 505                 /* Already registered connection */
 506                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 507                                           Client_ID(Client));
 508         } else {
 509                 /* Unexpected/invalid connection state? */
 510                 return IRC_WriteErrClient(Client, ERR_NOTREGISTERED_MSG,
 511                                           Client_ID(Client));
 512         }
 513 } /* IRC_USER */
 514
 515 /**
 516  * Handler for the IRC "SERVICE" command.
 517  *
 518  * At the moment ngIRCd doesn't support directly linked services, so this
 519  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 520  * received from a peer server.
 521  *
 522  * @param Client The client from which this command has been received.
 523  * @param Req Request structure with prefix and all parameters.
 524  * @return CONNECTED or DISCONNECTED.
 525  */
 526 GLOBAL bool
 527 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 528 {
 529         CLIENT *c, *intr_c;
 530         char *nick, *user, *host, *info, *modes, *ptr;
 531         int token, hops;
 532
 533         assert(Client != NULL);
 534         assert(Req != NULL);
 535
 536         if (Client_Type(Client) != CLIENT_GOTPASS &&
 537             Client_Type(Client) != CLIENT_SERVER)
 538                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 539                                           Client_ID(Client));
 540
 541         if (Client_Type(Client) != CLIENT_SERVER)
 542                 return IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 543                                   Client_ID(Client), Req->argv[0]);
 544
 545         nick = Req->argv[0];
 546         user = NULL; host = NULL;
 547         token = atoi(Req->argv[1]);
 548         hops = atoi(Req->argv[4]);
 549         info = Req->argv[5];
 550
 551         /* Validate service name ("nickname") */
 552         c = Client_Search(nick);
 553         if(c) {
 554                 /* Nickname collision: disconnect (KILL) both clients! */
 555                 Log(LOG_ERR,
 556                     "Server %s introduces already registered service \"%s\"!",
 557                     Client_ID(Client), nick);
 558                 return IRC_KillClient(Client, NULL, nick, "Nick collision");
 559         }
 560
 561         /* Get the server to which the service is connected */
 562         intr_c = Client_GetFromToken(Client, token);
 563         if (! intr_c) {
 564                 Log(LOG_ERR,
 565                     "Server %s introduces service \"%s\" on unknown server!?",
 566                     Client_ID(Client), nick);
 567                 return IRC_KillClient(Client, NULL, nick, "Unknown server");
 568         }
 569
 570         /* Get user and host name */
 571         ptr = strchr(nick, '@');
 572         if (ptr) {
 573                 *ptr = '\0';
 574                 host = ++ptr;
 575         }
 576         if (!host)
 577                 host = Client_Hostname(intr_c);
 578         ptr = strchr(nick, '!');
 579         if (ptr) {
 580                 *ptr = '\0';
 581                 user = ++ptr;
 582         }
 583         if (!user)
 584                 user = nick;
 585
 586         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 587          * for future usage"; but we use it to transfer the modes and check
 588          * that the first character is a '+' sign and ignore it otherwise. */
 589         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 590
 591         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 592                                  token, modes, info, true);
 593         if (! c) {
 594                 /* Couldn't create client structure, so KILL the service to
 595                  * keep network status consistent ... */
 596                 Log(LOG_ALERT,
 597                     "Can't create client structure! (on connection %d)",
 598                     Client_Conn(Client));
 599                 return IRC_KillClient(Client, NULL, nick, "Server error");
 600         }
 601
 602         Client_Introduce(Client, c, CLIENT_SERVICE);
 603         return CONNECTED;
 604 } /* IRC_SERVICE */
 605
 606 /**
 607  * Handler for the IRC "WEBIRC" command.
 608  *
 609  * @param Client The client from which this command has been received.
 610  * @param Req Request structure with prefix and all parameters.
 611  * @return CONNECTED or DISCONNECTED.
 612  */
 613 GLOBAL bool
 614 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 615 {
 616         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 617                 return IRC_WriteErrClient(Client, ERR_PASSWDMISMATCH_MSG,
 618                                           Client_ID(Client));
 619
 620         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 621                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 622
 623         Client_SetUser(Client, Req->argv[1], true);
 624         Client_SetOrigUser(Client, Req->argv[1]);
 625         if (Conf_DNS)
 626                 Client_SetHostname(Client, Req->argv[2]);
 627         else
 628                 Client_SetHostname(Client, Req->argv[3]);
 629         Client_SetIPAText(Client, Req->argv[3]);
 630
 631         return CONNECTED;
 632 } /* IRC_WEBIRC */
 633
 634 /**
 635  * Handler for the IRC "QUIT" command.
 636  *
 637  * @param Client The client from which this command has been received.
 638  * @param Req Request structure with prefix and all parameters.
 639  * @return CONNECTED or DISCONNECTED.
 640  */
 641 GLOBAL bool
 642 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 643 {
 644         CLIENT *target;
 645         char quitmsg[COMMAND_LEN];
 646
 647         assert(Client != NULL);
 648         assert(Req != NULL);
 649
 650         if (Req->argc == 1)
 651                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 652
 653         if (Client_Type(Client) == CLIENT_SERVER) {
 654                 /* Server */
 655                 target = Client_Search(Req->prefix);
 656                 if (!target) {
 657                         Log(LOG_WARNING,
 658                             "Got QUIT from %s for unknown client!?",
 659                             Client_ID(Client));
 660                         return CONNECTED;
 661                 }
 662
 663                 if (target != Client) {
 664                         Client_Destroy(target, "Got QUIT command",
 665                                        Req->argc == 1 ? quitmsg : NULL, true);
 666                         return CONNECTED;
 667                 } else {
 668                         Conn_Close(Client_Conn(Client), "Got QUIT command",
 669                                    Req->argc == 1 ? quitmsg : NULL, true);
 670                         return DISCONNECTED;
 671                 }
 672         } else {
 673                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 674                         /* " " to avoid confusion */
 675                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 676                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 677                         strlcat(quitmsg, "\"", sizeof quitmsg );
 678                 }
 679
 680                 /* User, Service, or not yet registered */
 681                 Conn_Close(Client_Conn(Client), "Got QUIT command",
 682                            Req->argc == 1 ? quitmsg : NULL, true);
 683
 684                 return DISCONNECTED;
 685         }
 686 } /* IRC_QUIT */
 687
 688 #ifndef STRICT_RFC
 689
 690 /**
 691  * Handler for HTTP command, e.g. GET and POST
 692  *
 693  * We handle these commands here to avoid the quite long timeout when
 694  * some user tries to access this IRC daemon using an web browser ...
 695  *
 696  * @param Client The client from which this command has been received.
 697  * @param Req Request structure with prefix and all parameters.
 698  * @return CONNECTED or DISCONNECTED.
 699  */
 700 GLOBAL bool
 701 IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
 702 {
 703         Req->argc = 1;
 704         Req->argv[0] = "Oops, HTTP request received? This is IRC!";
 705         return IRC_QUIT(Client, Req);
 706 } /* IRC_QUIT_HTTP */
 707
 708 #endif
 709
 710 /**
 711  * Handler for the IRC "PING" command.
 712  *
 713  * @param Client The client from which this command has been received.
 714  * @param Req Request structure with prefix and all parameters.
 715  * @return CONNECTED or DISCONNECTED.
 716  */
 717 GLOBAL bool
 718 IRC_PING(CLIENT *Client, REQUEST *Req)
 719 {
 720         CLIENT *target, *from;
 721
 722         assert(Client != NULL);
 723         assert(Req != NULL);
 724
 725         if (Req->argc < 1)
 726                 return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 727                                           Client_ID(Client));
 728 #ifdef STRICT_RFC
 729         /* Don't ignore additional arguments when in "strict" mode */
 730         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 731 #endif
 732
 733         if (Req->argc > 1) {
 734                 /* A target has been specified ... */
 735                 target = Client_Search(Req->argv[1]);
 736
 737                 if (!target || Client_Type(target) != CLIENT_SERVER)
 738                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 739                                         Client_ID(Client), Req->argv[1]);
 740
 741                 if (target != Client_ThisServer()) {
 742                         /* Ok, we have to forward the PING */
 743                         if (Client_Type(Client) == CLIENT_SERVER)
 744                                 from = Client_Search(Req->prefix);
 745                         else
 746                                 from = Client;
 747                         if (!from)
 748                                 return IRC_WriteErrClient(Client,
 749                                                 ERR_NOSUCHSERVER_MSG,
 750                                                 Client_ID(Client), Req->prefix);
 751
 752                         return IRC_WriteStrClientPrefix(target, from,
 753                                         "PING %s :%s", Req->argv[0],
 754                                         Req->argv[1] );
 755                 }
 756         }
 757
 758         if (Client_Type(Client) == CLIENT_SERVER) {
 759                 if (Req->prefix)
 760                         from = Client_Search(Req->prefix);
 761                 else
 762                         from = Client;
 763         } else
 764                 from = Client_ThisServer();
 765         if (!from)
 766                 return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 767                                         Client_ID(Client), Req->prefix);
 768
 769         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 770             Client_Conn(Client));
 771
 772 #ifdef STRICT_RFC
 773         return IRC_WriteStrClient(Client, "PONG %s :%s",
 774                 Client_ID(from), Client_ID(Client));
 775 #else
 776         /* Some clients depend on the argument being returned in the PONG
 777          * reply (not mentioned in any RFC, though) */
 778         return IRC_WriteStrClient(Client, "PONG %s :%s",
 779                 Client_ID(from), Req->argv[0]);
 780 #endif
 781 } /* IRC_PING */
 782
 783 /**
 784  * Handler for the IRC "PONG" command.
 785  *
 786  * @param Client The client from which this command has been received.
 787  * @param Req Request structure with prefix and all parameters.
 788  * @return CONNECTED or DISCONNECTED.
 789  */
 790 GLOBAL bool
 791 IRC_PONG(CLIENT *Client, REQUEST *Req)
 792 {
 793         CLIENT *target, *from;
 794         CONN_ID conn;
 795 #ifndef STRICT_RFC
 796         long auth_ping;
 797 #endif
 798         char *s;
 799
 800         assert(Client != NULL);
 801         assert(Req != NULL);
 802
 803         /* Wrong number of arguments? */
 804         if (Req->argc < 1) {
 805                 if (Client_Type(Client) == CLIENT_USER)
 806                         return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 807                                                   Client_ID(Client));
 808                 else
 809                         return CONNECTED;
 810         }
 811         if (Client_Type(Client) == CLIENT_USER) {
 812                 _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 813         }
 814
 815         /* Forward? */
 816         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 817                 target = Client_Search(Req->argv[0]);
 818                 if (!target)
 819                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 820                                         Client_ID(Client), Req->argv[0]);
 821
 822                 from = Client_Search(Req->prefix);
 823
 824                 if (target != Client_ThisServer() && target != from) {
 825                         /* Ok, we have to forward the message. */
 826                         if (!from)
 827                                 return IRC_WriteErrClient(Client,
 828                                                 ERR_NOSUCHSERVER_MSG,
 829                                                 Client_ID(Client), Req->prefix);
 830
 831                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 832                                 s = Client_ID(from);
 833                         else
 834                                 s = Req->argv[0];
 835                         return IRC_WriteStrClientPrefix(target, from,
 836                                  "PONG %s :%s", s, Req->argv[1]);
 837                 }
 838         }
 839
 840         /* The connection timestamp has already been updated when the data has
 841          * been read from so socket, so we don't need to update it here. */
 842
 843         conn = Client_Conn(Client);
 844
 845 #ifndef STRICT_RFC
 846         /* Check authentication PING-PONG ... */
 847         auth_ping = Conn_GetAuthPing(conn);
 848         if (auth_ping) {
 849                 LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
 850                          auth_ping, Req->argv[0]);
 851                 if (auth_ping == atol(Req->argv[0])) {
 852                         Conn_SetAuthPing(conn, 0);
 853                         if (Client_Type(Client) == CLIENT_WAITAUTHPING)
 854                                 Login_User(Client);
 855                 } else
 856                         if (!IRC_WriteStrClient(Client,
 857                                         "NOTICE %s :To connect, type /QUOTE PONG %ld",
 858                                         Client_ID(Client), auth_ping))
 859                                 return DISCONNECTED;
 860         }
 861 #endif
 862
 863         if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
 864                 Log(LOG_INFO,
 865                     "Synchronization with \"%s\" done (connection %d): %ld second%s [%ld users, %ld channels].",
 866                     Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
 867                     time(NULL) - Conn_GetSignon(conn) == 1 ? "" : "s",
 868                     Client_UserCount(), Channel_CountVisible(NULL));
 869                 Conn_UpdatePing(conn);
 870         } else
 871                 LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
 872                          conn, time(NULL) - Conn_LastPing(conn));
 873
 874         return CONNECTED;
 875 } /* IRC_PONG */
 876
 877 /**
 878  * Change the nickname of a client.
 879  *
 880  * @param Origin The client which caused the nickname change.
 881  * @param Target The client of which the nickname should be changed.
 882  * @param NewNick The new nickname.
 883  */
 884 static void
 885 Change_Nick(CLIENT *Origin, CLIENT *Target, char *NewNick, bool InformClient)
 886 {
 887         if (Client_Conn(Target) > NONE) {
 888                 /* Local client */
 889                 Log(LOG_INFO,
 890                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 891                     Client_TypeText(Target), Client_Mask(Target),
 892                     Client_Conn(Target), Client_ID(Target), NewNick);
 893                 Conn_UpdateIdle(Client_Conn(Target));
 894         } else {
 895                 /* Remote client */
 896                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 897                          Client_TypeText(Target),
 898                          Client_Mask(Target), Client_ID(Target), NewNick);
 899         }
 900
 901         /* Inform all servers and users (which have to know) of the new name */
 902         if (InformClient) {
 903                 IRC_WriteStrClientPrefix(Target, Target, "NICK :%s", NewNick);
 904                 IRC_WriteStrServersPrefix(NULL, Target, "NICK :%s", NewNick);
 905         } else
 906                 IRC_WriteStrServersPrefix(Origin, Target, "NICK :%s", NewNick);
 907         IRC_WriteStrRelatedPrefix(Target, Target, false, "NICK :%s", NewNick);
 908
 909         /* Register old nickname for WHOWAS queries */
 910         Client_RegisterWhowas(Target);
 911
 912         /* Save new nickname */
 913         Client_SetID(Target, NewNick);
 914 }
 915
 916 /* -eof- */