src/ngircd/irc-login.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * Login and logout
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <ctype.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <strings.h>
  25
  26 #include "conn-func.h"
  27 #include "class.h"
  28 #include "conf.h"
  29 #include "channel.h"
  30 #include "log.h"
  31 #include "login.h"
  32 #include "messages.h"
  33 #include "parse.h"
  34 #include "irc.h"
  35 #include "irc-info.h"
  36 #include "irc-macros.h"
  37 #include "irc-write.h"
  38
  39 #include "exp.h"
  40 #include "irc-login.h"
  41
  42 static void Kill_Nick PARAMS((char *Nick, char *Reason));
  43 static void Change_Nick PARAMS((CLIENT * Origin, CLIENT * Target, char *NewNick,
  44                                 bool InformClient));
  45
  46 /**
  47  * Handler for the IRC "PASS" command.
  48  *
  49  * @param Client The client from which this command has been received.
  50  * @param Req Request structure with prefix and all parameters.
  51  * @return CONNECTED or DISCONNECTED.
  52  */
  53 GLOBAL bool
  54 IRC_PASS( CLIENT *Client, REQUEST *Req )
  55 {
  56         char *type, *orig_flags;
  57         int protohigh, protolow;
  58
  59         assert( Client != NULL );
  60         assert( Req != NULL );
  61
  62         /* Return an error if this is not a local client */
  63         if (Client_Conn(Client) <= NONE)
  64                 return IRC_WriteErrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  65                                           Client_ID(Client), Req->command);
  66
  67         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  68                 /* Not yet registered "unknown" connection, PASS with one
  69                  * argument: either a regular client, service, or server
  70                  * using the old RFC 1459 section 4.1.1 syntax. */
  71                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  72                          Client_Conn(Client));
  73         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  74                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  75                    (Req->argc == 3 || Req->argc == 4)) {
  76                 /* Not yet registered "unknown" connection or outgoing server
  77                  * link, PASS with three or four argument: server using the
  78                  * RFC 2813 section 4.1.1 syntax. */
  79                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  80                          Client_Conn(Client));
  81         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  82                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  83                 /* Unregistered connection, but wrong number of arguments: */
  84                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  85                                           Client_ID(Client), Req->command);
  86         } else {
  87                 /* Registered connection, PASS command is not allowed! */
  88                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
  89                                           Client_ID(Client));
  90         }
  91
  92         Conn_SetPassword(Client_Conn(Client), Req->argv[0]);
  93
  94         /* Protocol version */
  95         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
  96                 int c2, c4;
  97
  98                 c2 = Req->argv[1][2];
  99                 c4 = Req->argv[1][4];
 100
 101                 Req->argv[1][4] = '\0';
 102                 protolow = atoi(&Req->argv[1][2]);
 103                 Req->argv[1][2] = '\0';
 104                 protohigh = atoi(Req->argv[1]);
 105
 106                 Req->argv[1][2] = c2;
 107                 Req->argv[1][4] = c4;
 108
 109                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 110         } else {
 111                 protohigh = protolow = 0;
 112                 Client_SetType(Client, CLIENT_GOTPASS);
 113         }
 114
 115         /* Protocol type, see doc/Protocol.txt */
 116         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 117                 type = &Req->argv[1][4];
 118         else
 119                 type = NULL;
 120
 121         /* Protocol flags/options */
 122         if (Req->argc >= 4)
 123                 orig_flags = Req->argv[3];
 124         else
 125                 orig_flags = "";
 126
 127         /* Implementation, version and IRC+ flags */
 128         if (Req->argc >= 3) {
 129                 char *impl, *ptr, *serverver, *flags;
 130
 131                 impl = Req->argv[2];
 132                 ptr = strchr(impl, '|');
 133                 if (ptr)
 134                         *ptr = '\0';
 135
 136                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 137                         /* The peer seems to be a server which supports the
 138                          * IRC+ protocol (see doc/Protocol.txt). */
 139                         serverver = ptr ? ptr + 1 : "?";
 140                         flags = strchr(ptr ? serverver : impl, ':');
 141                         if (flags) {
 142                                 *flags = '\0';
 143                                 flags++;
 144                         } else
 145                                 flags = "";
 146                         Log(LOG_INFO,
 147                             "Peer on connection %d announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 148                             Client_Conn(Client), impl, serverver,
 149                             protohigh, protolow, flags);
 150                 } else {
 151                         /* The peer seems to be a server supporting the
 152                          * "original" IRC protocol (RFC 2813). */
 153                         if (strchr(orig_flags, 'Z'))
 154                                 flags = "Z";
 155                         else
 156                                 flags = "";
 157                         Log(LOG_INFO,
 158                             "Peer on connection %d announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 159                             Client_Conn(Client), impl,
 160                             protohigh, protolow, flags);
 161                 }
 162                 Client_SetFlags(Client, flags);
 163         }
 164
 165         return CONNECTED;
 166 } /* IRC_PASS */
 167
 168 /**
 169  * Handler for the IRC "NICK" command.
 170  *
 171  * @param Client The client from which this command has been received.
 172  * @param Req Request structure with prefix and all parameters.
 173  * @return CONNECTED or DISCONNECTED.
 174  */
 175 GLOBAL bool
 176 IRC_NICK( CLIENT *Client, REQUEST *Req )
 177 {
 178         CLIENT *intr_c, *target, *c;
 179         char *nick, *user, *hostname, *modes, *info;
 180         int token, hops;
 181
 182         assert( Client != NULL );
 183         assert( Req != NULL );
 184
 185         /* Some IRC clients, for example BitchX, send the NICK and USER
 186          * commands in the wrong order ... */
 187         if(Client_Type(Client) == CLIENT_UNKNOWN
 188             || Client_Type(Client) == CLIENT_GOTPASS
 189             || Client_Type(Client) == CLIENT_GOTNICK
 190 #ifndef STRICT_RFC
 191             || Client_Type(Client) == CLIENT_GOTUSER
 192 #endif
 193             || Client_Type(Client) == CLIENT_USER
 194             || Client_Type(Client) == CLIENT_SERVICE
 195             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 196         {
 197                 /* User registration or change of nickname */
 198                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 1)
 199
 200                 /* Search "target" client */
 201                 if (Client_Type(Client) == CLIENT_SERVER) {
 202                         target = Client_Search(Req->prefix);
 203                         if (!target)
 204                                 return IRC_WriteErrClient(Client,
 205                                                           ERR_NOSUCHNICK_MSG,
 206                                                           Client_ID(Client),
 207                                                           Req->argv[0]);
 208                 } else {
 209                         /* Is this a restricted client? */
 210                         if (Client_HasMode(Client, 'r'))
 211                                 return IRC_WriteErrClient(Client,
 212                                                           ERR_RESTRICTED_MSG,
 213                                                           Client_ID(Client));
 214                         target = Client;
 215                 }
 216
 217 #ifndef STRICT_RFC
 218                 /* If the clients tries to change to its own nickname we won't
 219                  * do anything. This is how the original ircd behaves and some
 220                  * clients (for example Snak) expect it to be like this.
 221                  * But I doubt that this is "really the right thing" ... */
 222                 if (strcmp(Client_ID(target), Req->argv[0]) == 0)
 223                         return CONNECTED;
 224 #endif
 225
 226                 /* Check that the new nickname is available. Special case:
 227                  * the client only changes from/to upper to lower case. */
 228                 if (strcasecmp(Client_ID(target), Req->argv[0]) != 0) {
 229                         if (!Client_CheckNick(target, Req->argv[0]))
 230                                 return CONNECTED;
 231                 }
 232
 233                 if (Client_Type(target) != CLIENT_USER &&
 234                     Client_Type(target) != CLIENT_SERVICE &&
 235                     Client_Type(target) != CLIENT_SERVER) {
 236                         /* New client */
 237                         LogDebug("Connection %d: got valid NICK command ...",
 238                              Client_Conn( Client ));
 239
 240                         /* Register new nickname of this client */
 241                         Client_SetID( target, Req->argv[0] );
 242
 243 #ifndef STRICT_RFC
 244                         if (Conf_AuthPing) {
 245                                 Conn_SetAuthPing(Client_Conn(Client), rand());
 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, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 304                         Kill_Nick( Req->argv[0], "Nick collision" );
 305                         return CONNECTED;
 306                 }
 307
 308                 /* Find the Server this client is connected to */
 309                 intr_c = Client_GetFromToken(Client, token);
 310                 if (!intr_c) {
 311                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 312                         Kill_Nick( Req->argv[0], "Unknown server" );
 313                         return CONNECTED;
 314                 }
 315
 316                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 317                                          token, modes, info, true);
 318                 if (!c) {
 319                         /* Out of memory, we need to disconnect client to keep
 320                          * network state consistent! */
 321                         Log(LOG_ALERT,
 322                             "Can't create client structure! (on connection %d)",
 323                             Client_Conn(Client));
 324                         Kill_Nick(Req->argv[0], "Server error");
 325                         return CONNECTED;
 326                 }
 327
 328                 /* RFC 2813: client is now fully registered, inform all the
 329                  * other servers about the new user.
 330                  * RFC 1459: announce the new client only after receiving the
 331                  * USER command, first we need more information! */
 332                 if (Req->argc < 7) {
 333                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 334                                  Client_Mask(c));
 335                         Client_SetType(c, CLIENT_GOTNICK);
 336                 } else
 337                         Client_Introduce(Client, c, CLIENT_USER);
 338
 339                 return CONNECTED;
 340         }
 341         else
 342                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 343                                           Client_ID(Client));
 344 } /* IRC_NICK */
 345
 346 /**
 347  * Handler for the IRC "SVSNICK" command.
 348  *
 349  * @param Client The client from which this command has been received.
 350  * @param Req Request structure with prefix and all parameters.
 351  * @return CONNECTED or DISCONNECTED.
 352  */
 353 GLOBAL bool
 354 IRC_SVSNICK(CLIENT *Client, REQUEST *Req)
 355 {
 356         CLIENT *from, *target;
 357
 358         assert(Client != NULL);
 359         assert(Req != NULL);
 360
 361         /* Search the originator */
 362         from = Client_Search(Req->prefix);
 363         if (!from)
 364                 from = Client;
 365
 366         /* Search the target */
 367         target = Client_Search(Req->argv[0]);
 368         if (!target || Client_Type(target) != CLIENT_USER) {
 369                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 370                                           Client_ID(Client), Req->argv[0]);
 371         }
 372
 373         if (Client_Conn(target) <= NONE) {
 374                 /* We have to forward the message to the server handling
 375                  * this user; this is required to make sure all servers
 376                  * in the network do follow the nick name change! */
 377                 return IRC_WriteStrClientPrefix(Client_NextHop(target), from,
 378                                                 "SVSNICK %s %s",
 379                                                 Req->argv[0], Req->argv[1]);
 380         }
 381
 382         /* Make sure that the new nickname is valid */
 383         if (!Client_CheckNick(from, Req->argv[1]))
 384                 return CONNECTED;
 385
 386         Change_Nick(from, target, Req->argv[1], true);
 387         return CONNECTED;
 388 }
 389
 390 /**
 391  * Handler for the IRC "USER" command.
 392  *
 393  * @param Client The client from which this command has been received.
 394  * @param Req Request structure with prefix and all parameters.
 395  * @return CONNECTED or DISCONNECTED.
 396  */
 397 GLOBAL bool
 398 IRC_USER(CLIENT * Client, REQUEST * Req)
 399 {
 400         CLIENT *c;
 401         char *ptr;
 402
 403         assert(Client != NULL);
 404         assert(Req != NULL);
 405
 406         if (Client_Type(Client) == CLIENT_GOTNICK ||
 407 #ifndef STRICT_RFC
 408             Client_Type(Client) == CLIENT_UNKNOWN ||
 409 #endif
 410             Client_Type(Client) == CLIENT_GOTPASS)
 411         {
 412                 /* New connection */
 413                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 414
 415                 /* User name: only alphanumeric characters and limited
 416                    punctuation is allowed.*/
 417                 ptr = Req->argv[0];
 418                 while (*ptr) {
 419                         if (!isalnum((int)*ptr) &&
 420                             *ptr != '+' && *ptr != '-' && *ptr != '@' &&
 421                             *ptr != '.' && *ptr != '_') {
 422                                 Conn_Close(Client_Conn(Client), NULL,
 423                                            "Invalid user name", true);
 424                                 return DISCONNECTED;
 425                         }
 426                         ptr++;
 427                 }
 428
 429                 /* Save the received username for authentication, and use
 430                  * it up to the first '@' as default user name (like ircd2.11,
 431                  * bahamut, ircd-seven, ...), prefixed with '~', if needed: */
 432                 Client_SetOrigUser(Client, Req->argv[0]);
 433                 ptr = strchr(Req->argv[0], '@');
 434                 if (ptr)
 435                         *ptr = '\0';
 436 #ifdef IDENTAUTH
 437                 ptr = Client_User(Client);
 438                 if (!ptr || !*ptr || *ptr == '~')
 439                         Client_SetUser(Client, Req->argv[0], false);
 440 #else
 441                 Client_SetUser(Client, Req->argv[0], false);
 442 #endif
 443
 444                 /* "Real name" or user info text: Don't set it to the empty
 445                  * string, the original ircd can't deal with such "real names"
 446                  * (e. g. "USER user * * :") ... */
 447                 if (*Req->argv[3])
 448                         Client_SetInfo(Client, Req->argv[3]);
 449                 else
 450                         Client_SetInfo(Client, "-");
 451
 452                 LogDebug("Connection %d: got valid USER command ...",
 453                     Client_Conn(Client));
 454                 if (Client_Type(Client) == CLIENT_GOTNICK)
 455                         return Login_User(Client);
 456                 else
 457                         Client_SetType(Client, CLIENT_GOTUSER);
 458                 return CONNECTED;
 459
 460         } else if (Client_Type(Client) == CLIENT_SERVER ||
 461                    Client_Type(Client) == CLIENT_SERVICE) {
 462                 /* Server/service updating an user */
 463                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 464
 465                 c = Client_Search(Req->prefix);
 466                 if (!c)
 467                         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 468                                                   Client_ID(Client),
 469                                                   Req->prefix);
 470
 471                 Client_SetUser(c, Req->argv[0], true);
 472                 Client_SetOrigUser(c, Req->argv[0]);
 473                 Client_SetHostname(c, Req->argv[1]);
 474                 Client_SetInfo(c, Req->argv[3]);
 475
 476                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 477                          Client_Conn(Client), Client_Mask(c));
 478
 479                 /* RFC 1459 style user registration?
 480                  * Introduce client to network: */
 481                 if (Client_Type(c) == CLIENT_GOTNICK)
 482                         Client_Introduce(Client, c, CLIENT_USER);
 483
 484                 return CONNECTED;
 485         } else if (Client_Type(Client) == CLIENT_USER) {
 486                 /* Already registered connection */
 487                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 488                                           Client_ID(Client));
 489         } else {
 490                 /* Unexpected/invalid connection state? */
 491                 return IRC_WriteErrClient(Client, ERR_NOTREGISTERED_MSG,
 492                                           Client_ID(Client));
 493         }
 494 } /* IRC_USER */
 495
 496 /**
 497  * Handler for the IRC "SERVICE" command.
 498  *
 499  * At the moment ngIRCd doesn't support directly linked services, so this
 500  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 501  * received from a peer server.
 502  *
 503  * @param Client The client from which this command has been received.
 504  * @param Req Request structure with prefix and all parameters.
 505  * @return CONNECTED or DISCONNECTED.
 506  */
 507 GLOBAL bool
 508 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 509 {
 510         CLIENT *c, *intr_c;
 511         char *nick, *user, *host, *info, *modes, *ptr;
 512         int token, hops;
 513
 514         assert(Client != NULL);
 515         assert(Req != NULL);
 516
 517         if (Client_Type(Client) != CLIENT_GOTPASS &&
 518             Client_Type(Client) != CLIENT_SERVER)
 519                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 520                                           Client_ID(Client));
 521
 522         if (Client_Type(Client) != CLIENT_SERVER)
 523                 return IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 524                                   Client_ID(Client), Req->argv[0]);
 525
 526         nick = Req->argv[0];
 527         user = NULL; host = NULL;
 528         token = atoi(Req->argv[1]);
 529         hops = atoi(Req->argv[4]);
 530         info = Req->argv[5];
 531
 532         /* Validate service name ("nickname") */
 533         c = Client_Search(nick);
 534         if(c) {
 535                 /* Nickname collision: disconnect (KILL) both clients! */
 536                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 537                     Client_ID(Client), nick);
 538                 Kill_Nick(nick, "Nick collision");
 539                 return CONNECTED;
 540         }
 541
 542         /* Get the server to which the service is connected */
 543         intr_c = Client_GetFromToken(Client, token);
 544         if (! intr_c) {
 545                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 546                     Client_ID(Client), nick);
 547                 Kill_Nick(nick, "Unknown server");
 548                 return CONNECTED;
 549         }
 550
 551         /* Get user and host name */
 552         ptr = strchr(nick, '@');
 553         if (ptr) {
 554                 *ptr = '\0';
 555                 host = ++ptr;
 556         }
 557         if (!host)
 558                 host = Client_Hostname(intr_c);
 559         ptr = strchr(nick, '!');
 560         if (ptr) {
 561                 *ptr = '\0';
 562                 user = ++ptr;
 563         }
 564         if (!user)
 565                 user = nick;
 566
 567         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 568          * for future usage"; but we use it to transfer the modes and check
 569          * that the first character is a '+' sign and ignore it otherwise. */
 570         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 571
 572         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 573                                  token, modes, info, true);
 574         if (! c) {
 575                 /* Couldn't create client structure, so KILL the service to
 576                  * keep network status consistent ... */
 577                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 578                     Client_Conn(Client));
 579                 Kill_Nick(nick, "Server error");
 580                 return CONNECTED;
 581         }
 582
 583         Client_Introduce(Client, c, CLIENT_SERVICE);
 584         return CONNECTED;
 585 } /* IRC_SERVICE */
 586
 587 /**
 588  * Handler for the IRC "WEBIRC" command.
 589  *
 590  * @param Client The client from which this command has been received.
 591  * @param Req Request structure with prefix and all parameters.
 592  * @return CONNECTED or DISCONNECTED.
 593  */
 594 GLOBAL bool
 595 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 596 {
 597         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 598                 return IRC_WriteErrClient(Client, ERR_PASSWDMISMATCH_MSG,
 599                                           Client_ID(Client));
 600
 601         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 602                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 603
 604         Client_SetUser(Client, Req->argv[1], true);
 605         Client_SetOrigUser(Client, Req->argv[1]);
 606         Client_SetHostname(Client, Req->argv[2]);
 607         Client_SetIPAText(Client, Req->argv[3]);
 608
 609         return CONNECTED;
 610 } /* IRC_WEBIRC */
 611
 612 /**
 613  * Handler for the IRC "QUIT" command.
 614  *
 615  * @param Client The client from which this command has been received.
 616  * @param Req Request structure with prefix and all parameters.
 617  * @return CONNECTED or DISCONNECTED.
 618  */
 619 GLOBAL bool
 620 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 621 {
 622         CLIENT *target;
 623         char quitmsg[LINE_LEN];
 624
 625         assert(Client != NULL);
 626         assert(Req != NULL);
 627
 628         if (Req->argc == 1)
 629                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 630
 631         if (Client_Type(Client) == CLIENT_SERVER) {
 632                 /* Server */
 633                 target = Client_Search(Req->prefix);
 634                 if (!target) {
 635                         Log(LOG_WARNING,
 636                             "Got QUIT from %s for unknown client!?",
 637                             Client_ID(Client));
 638                         return CONNECTED;
 639                 }
 640
 641                 if (target != Client) {
 642                         Client_Destroy(target, "Got QUIT command",
 643                                        Req->argc == 1 ? quitmsg : NULL, true);
 644                         return CONNECTED;
 645                 } else {
 646                         Conn_Close(Client_Conn(Client), "Got QUIT command",
 647                                    Req->argc == 1 ? quitmsg : NULL, true);
 648                         return DISCONNECTED;
 649                 }
 650         } else {
 651                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 652                         /* " " to avoid confusion */
 653                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 654                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 655                         strlcat(quitmsg, "\"", sizeof quitmsg );
 656                 }
 657
 658                 /* User, Service, or not yet registered */
 659                 Conn_Close(Client_Conn(Client), "Got QUIT command",
 660                            Req->argc == 1 ? quitmsg : NULL, true);
 661
 662                 return DISCONNECTED;
 663         }
 664 } /* IRC_QUIT */
 665
 666 #ifndef STRICT_RFC
 667
 668 /**
 669  * Handler for HTTP command, e.g. GET and POST
 670  *
 671  * We handle these commands here to avoid the quite long timeout when
 672  * some user tries to access this IRC daemon using an web browser ...
 673  *
 674  * @param Client The client from which this command has been received.
 675  * @param Req Request structure with prefix and all parameters.
 676  * @return CONNECTED or DISCONNECTED.
 677  */
 678 GLOBAL bool
 679 IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
 680 {
 681         Req->argc = 1;
 682         Req->argv[0] = "Oops, HTTP request received? This is IRC!";
 683         return IRC_QUIT(Client, Req);
 684 } /* IRC_QUIT_HTTP */
 685
 686 #endif
 687
 688 /**
 689  * Handler for the IRC "PING" command.
 690  *
 691  * @param Client The client from which this command has been received.
 692  * @param Req Request structure with prefix and all parameters.
 693  * @return CONNECTED or DISCONNECTED.
 694  */
 695 GLOBAL bool
 696 IRC_PING(CLIENT *Client, REQUEST *Req)
 697 {
 698         CLIENT *target, *from;
 699
 700         assert(Client != NULL);
 701         assert(Req != NULL);
 702
 703         if (Req->argc < 1)
 704                 return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 705                                           Client_ID(Client));
 706 #ifdef STRICT_RFC
 707         /* Don't ignore additional arguments when in "strict" mode */
 708         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 709 #endif
 710
 711         if (Req->argc > 1) {
 712                 /* A target has been specified ... */
 713                 target = Client_Search(Req->argv[1]);
 714
 715                 if (!target || Client_Type(target) != CLIENT_SERVER)
 716                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 717                                         Client_ID(Client), Req->argv[1]);
 718
 719                 if (target != Client_ThisServer()) {
 720                         /* Ok, we have to forward the PING */
 721                         if (Client_Type(Client) == CLIENT_SERVER)
 722                                 from = Client_Search(Req->prefix);
 723                         else
 724                                 from = Client;
 725                         if (!from)
 726                                 return IRC_WriteErrClient(Client,
 727                                                 ERR_NOSUCHSERVER_MSG,
 728                                                 Client_ID(Client), Req->prefix);
 729
 730                         return IRC_WriteStrClientPrefix(target, from,
 731                                         "PING %s :%s", Req->argv[0],
 732                                         Req->argv[1] );
 733                 }
 734         }
 735
 736         if (Client_Type(Client) == CLIENT_SERVER) {
 737                 if (Req->prefix)
 738                         from = Client_Search(Req->prefix);
 739                 else
 740                         from = Client;
 741         } else
 742                 from = Client_ThisServer();
 743         if (!from)
 744                 return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 745                                         Client_ID(Client), Req->prefix);
 746
 747         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 748             Client_Conn(Client));
 749
 750 #ifdef STRICT_RFC
 751         return IRC_WriteStrClient(Client, "PONG %s :%s",
 752                 Client_ID(from), Client_ID(Client));
 753 #else
 754         /* Some clients depend on the argument being returned in the PONG
 755          * reply (not mentioned in any RFC, though) */
 756         return IRC_WriteStrClient(Client, "PONG %s :%s",
 757                 Client_ID(from), Req->argv[0]);
 758 #endif
 759 } /* IRC_PING */
 760
 761 /**
 762  * Handler for the IRC "PONG" command.
 763  *
 764  * @param Client The client from which this command has been received.
 765  * @param Req Request structure with prefix and all parameters.
 766  * @return CONNECTED or DISCONNECTED.
 767  */
 768 GLOBAL bool
 769 IRC_PONG(CLIENT *Client, REQUEST *Req)
 770 {
 771         CLIENT *target, *from;
 772         CONN_ID conn;
 773 #ifndef STRICT_RFC
 774         long auth_ping;
 775 #endif
 776         char *s;
 777
 778         assert(Client != NULL);
 779         assert(Req != NULL);
 780
 781         /* Wrong number of arguments? */
 782         if (Req->argc < 1) {
 783                 if (Client_Type(Client) == CLIENT_USER)
 784                         return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 785                                                   Client_ID(Client));
 786                 else
 787                         return CONNECTED;
 788         }
 789         if (Client_Type(Client) == CLIENT_USER) {
 790                 _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 791         }
 792
 793         /* Forward? */
 794         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 795                 target = Client_Search(Req->argv[0]);
 796                 if (!target)
 797                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 798                                         Client_ID(Client), Req->argv[0]);
 799
 800                 from = Client_Search(Req->prefix);
 801
 802                 if (target != Client_ThisServer() && target != from) {
 803                         /* Ok, we have to forward the message. */
 804                         if (!from)
 805                                 return IRC_WriteErrClient(Client,
 806                                                 ERR_NOSUCHSERVER_MSG,
 807                                                 Client_ID(Client), Req->prefix);
 808
 809                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 810                                 s = Client_ID(from);
 811                         else
 812                                 s = Req->argv[0];
 813                         return IRC_WriteStrClientPrefix(target, from,
 814                                  "PONG %s :%s", s, Req->argv[1]);
 815                 }
 816         }
 817
 818         /* The connection timestamp has already been updated when the data has
 819          * been read from so socket, so we don't need to update it here. */
 820
 821         conn = Client_Conn(Client);
 822
 823 #ifndef STRICT_RFC
 824         /* Check authentication PING-PONG ... */
 825         auth_ping = Conn_GetAuthPing(conn);
 826         if (auth_ping) {
 827                 LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
 828                          auth_ping, Req->argv[0]);
 829                 if (auth_ping == atoi(Req->argv[0])) {
 830                         Conn_SetAuthPing(conn, 0);
 831                         if (Client_Type(Client) == CLIENT_WAITAUTHPING)
 832                                 Login_User(Client);
 833                 } else
 834                         if (!IRC_WriteStrClient(Client,
 835                                         "To connect, type /QUOTE PONG %ld",
 836                                         auth_ping))
 837                                 return DISCONNECTED;
 838         }
 839 #endif
 840
 841         if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
 842                 Log(LOG_INFO,
 843                     "Synchronization with \"%s\" done (connection %d): %ld second%s [%ld users, %ld channels].",
 844                     Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
 845                     time(NULL) - Conn_GetSignon(conn) == 1 ? "" : "s",
 846                     Client_UserCount(), Channel_CountVisible(NULL));
 847                 Conn_UpdatePing(conn);
 848         } else
 849                 LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
 850                          conn, time(NULL) - Conn_LastPing(conn));
 851
 852         return CONNECTED;
 853 } /* IRC_PONG */
 854
 855 /**
 856  * Kill all users with a specific nickname in the network.
 857  *
 858  * @param Nick Nickname.
 859  * @param Reason Reason for the KILL.
 860  */
 861 static void
 862 Kill_Nick(char *Nick, char *Reason)
 863 {
 864         REQUEST r;
 865
 866         assert (Nick != NULL);
 867         assert (Reason != NULL);
 868
 869         r.prefix = NULL;
 870         r.argv[0] = Nick;
 871         r.argv[1] = Reason;
 872         r.argc = 2;
 873
 874         Log(LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s!",
 875             Nick, Reason);
 876
 877         IRC_KILL(Client_ThisServer(), &r);
 878 } /* Kill_Nick */
 879
 880 /**
 881  * Change the nickname of a client.
 882  *
 883  * @param Origin The client which caused the nickname change.
 884  * @param Target The client of which the nickname should be changed.
 885  * @param NewNick The new nickname.
 886  */
 887 static void
 888 Change_Nick(CLIENT *Origin, CLIENT *Target, char *NewNick, bool InformClient)
 889 {
 890         if (Client_Conn(Target) > NONE) {
 891                 /* Local client */
 892                 Log(LOG_INFO,
 893                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 894                     Client_TypeText(Target), Client_Mask(Target),
 895                     Client_Conn(Target), Client_ID(Target), NewNick);
 896                 Conn_UpdateIdle(Client_Conn(Target));
 897         } else {
 898                 /* Remote client */
 899                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 900                          Client_TypeText(Target),
 901                          Client_Mask(Target), Client_ID(Target), NewNick);
 902         }
 903
 904         /* Inform all servers and users (which have to know) of the new name */
 905         if (InformClient) {
 906                 IRC_WriteStrClientPrefix(Target, Target, "NICK :%s", NewNick);
 907                 IRC_WriteStrServersPrefix(NULL, Target, "NICK :%s", NewNick);
 908         } else
 909                 IRC_WriteStrServersPrefix(Origin, Target, "NICK :%s", NewNick);
 910         IRC_WriteStrRelatedPrefix(Target, Target, false, "NICK :%s", NewNick);
 911
 912         /* Register old nickname for WHOWAS queries */
 913         Client_RegisterWhowas(Target);
 914
 915         /* Save new nickname */
 916         Client_SetID(Target, NewNick);
 917 }
 918
 919 /* -eof- */