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         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
 362
 363         /* Search the originator */
 364         from = Client_Search(Req->prefix);
 365         if (!from)
 366                 from = Client;
 367
 368         /* Search the target */
 369         target = Client_Search(Req->argv[0]);
 370         if (!target || Client_Type(target) != CLIENT_USER) {
 371                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 372                                           Client_ID(Client), Req->argv[0]);
 373         }
 374
 375         if (Client_Conn(target) <= NONE) {
 376                 /* We have to forward the message to the server handling
 377                  * this user; this is required to make sure all servers
 378                  * in the network do follow the nick name change! */
 379                 return IRC_WriteStrClientPrefix(Client_NextHop(target), from,
 380                                                 "SVSNICK %s %s",
 381                                                 Req->argv[0], Req->argv[1]);
 382         }
 383
 384         /* Make sure that the new nickname is valid */
 385         if (!Client_CheckNick(from, Req->argv[1]))
 386                 return CONNECTED;
 387
 388         Change_Nick(from, target, Req->argv[1], true);
 389         return CONNECTED;
 390 }
 391
 392 /**
 393  * Handler for the IRC "USER" command.
 394  *
 395  * @param Client The client from which this command has been received.
 396  * @param Req Request structure with prefix and all parameters.
 397  * @return CONNECTED or DISCONNECTED.
 398  */
 399 GLOBAL bool
 400 IRC_USER(CLIENT * Client, REQUEST * Req)
 401 {
 402         CLIENT *c;
 403         char *ptr;
 404
 405         assert(Client != NULL);
 406         assert(Req != NULL);
 407
 408         if (Client_Type(Client) == CLIENT_GOTNICK ||
 409 #ifndef STRICT_RFC
 410             Client_Type(Client) == CLIENT_UNKNOWN ||
 411 #endif
 412             Client_Type(Client) == CLIENT_GOTPASS)
 413         {
 414                 /* New connection */
 415                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 416
 417                 /* User name: only alphanumeric characters and limited
 418                    punctuation is allowed.*/
 419                 ptr = Req->argv[0];
 420                 while (*ptr) {
 421                         if (!isalnum((int)*ptr) &&
 422                             *ptr != '+' && *ptr != '-' && *ptr != '@' &&
 423                             *ptr != '.' && *ptr != '_') {
 424                                 Conn_Close(Client_Conn(Client), NULL,
 425                                            "Invalid user name", true);
 426                                 return DISCONNECTED;
 427                         }
 428                         ptr++;
 429                 }
 430
 431                 /* Save the received username for authentication, and use
 432                  * it up to the first '@' as default user name (like ircd2.11,
 433                  * bahamut, ircd-seven, ...), prefixed with '~', if needed: */
 434                 Client_SetOrigUser(Client, Req->argv[0]);
 435                 ptr = strchr(Req->argv[0], '@');
 436                 if (ptr)
 437                         *ptr = '\0';
 438 #ifdef IDENTAUTH
 439                 ptr = Client_User(Client);
 440                 if (!ptr || !*ptr || *ptr == '~')
 441                         Client_SetUser(Client, Req->argv[0], false);
 442 #else
 443                 Client_SetUser(Client, Req->argv[0], false);
 444 #endif
 445
 446                 /* "Real name" or user info text: Don't set it to the empty
 447                  * string, the original ircd can't deal with such "real names"
 448                  * (e. g. "USER user * * :") ... */
 449                 if (*Req->argv[3])
 450                         Client_SetInfo(Client, Req->argv[3]);
 451                 else
 452                         Client_SetInfo(Client, "-");
 453
 454                 LogDebug("Connection %d: got valid USER command ...",
 455                     Client_Conn(Client));
 456                 if (Client_Type(Client) == CLIENT_GOTNICK)
 457                         return Login_User(Client);
 458                 else
 459                         Client_SetType(Client, CLIENT_GOTUSER);
 460                 return CONNECTED;
 461
 462         } else if (Client_Type(Client) == CLIENT_SERVER ||
 463                    Client_Type(Client) == CLIENT_SERVICE) {
 464                 /* Server/service updating an user */
 465                 _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 466
 467                 c = Client_Search(Req->prefix);
 468                 if (!c)
 469                         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 470                                                   Client_ID(Client),
 471                                                   Req->prefix);
 472
 473                 Client_SetUser(c, Req->argv[0], true);
 474                 Client_SetOrigUser(c, Req->argv[0]);
 475                 Client_SetHostname(c, Req->argv[1]);
 476                 Client_SetInfo(c, Req->argv[3]);
 477
 478                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 479                          Client_Conn(Client), Client_Mask(c));
 480
 481                 /* RFC 1459 style user registration?
 482                  * Introduce client to network: */
 483                 if (Client_Type(c) == CLIENT_GOTNICK)
 484                         Client_Introduce(Client, c, CLIENT_USER);
 485
 486                 return CONNECTED;
 487         } else if (Client_Type(Client) == CLIENT_USER) {
 488                 /* Already registered connection */
 489                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 490                                           Client_ID(Client));
 491         } else {
 492                 /* Unexpected/invalid connection state? */
 493                 return IRC_WriteErrClient(Client, ERR_NOTREGISTERED_MSG,
 494                                           Client_ID(Client));
 495         }
 496 } /* IRC_USER */
 497
 498 /**
 499  * Handler for the IRC "SERVICE" command.
 500  *
 501  * At the moment ngIRCd doesn't support directly linked services, so this
 502  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 503  * received from a peer server.
 504  *
 505  * @param Client The client from which this command has been received.
 506  * @param Req Request structure with prefix and all parameters.
 507  * @return CONNECTED or DISCONNECTED.
 508  */
 509 GLOBAL bool
 510 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 511 {
 512         CLIENT *c, *intr_c;
 513         char *nick, *user, *host, *info, *modes, *ptr;
 514         int token, hops;
 515
 516         assert(Client != NULL);
 517         assert(Req != NULL);
 518
 519         if (Client_Type(Client) != CLIENT_GOTPASS &&
 520             Client_Type(Client) != CLIENT_SERVER)
 521                 return IRC_WriteErrClient(Client, ERR_ALREADYREGISTRED_MSG,
 522                                           Client_ID(Client));
 523
 524         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 6)
 525
 526         if (Client_Type(Client) != CLIENT_SERVER)
 527                 return IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 528                                   Client_ID(Client), Req->argv[0]);
 529
 530         nick = Req->argv[0];
 531         user = NULL; host = NULL;
 532         token = atoi(Req->argv[1]);
 533         hops = atoi(Req->argv[4]);
 534         info = Req->argv[5];
 535
 536         /* Validate service name ("nickname") */
 537         c = Client_Search(nick);
 538         if(c) {
 539                 /* Nickname collision: disconnect (KILL) both clients! */
 540                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 541                     Client_ID(Client), nick);
 542                 Kill_Nick(nick, "Nick collision");
 543                 return CONNECTED;
 544         }
 545
 546         /* Get the server to which the service is connected */
 547         intr_c = Client_GetFromToken(Client, token);
 548         if (! intr_c) {
 549                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 550                     Client_ID(Client), nick);
 551                 Kill_Nick(nick, "Unknown server");
 552                 return CONNECTED;
 553         }
 554
 555         /* Get user and host name */
 556         ptr = strchr(nick, '@');
 557         if (ptr) {
 558                 *ptr = '\0';
 559                 host = ++ptr;
 560         }
 561         if (!host)
 562                 host = Client_Hostname(intr_c);
 563         ptr = strchr(nick, '!');
 564         if (ptr) {
 565                 *ptr = '\0';
 566                 user = ++ptr;
 567         }
 568         if (!user)
 569                 user = nick;
 570
 571         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 572          * for future usage"; but we use it to transfer the modes and check
 573          * that the first character is a '+' sign and ignore it otherwise. */
 574         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 575
 576         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 577                                  token, modes, info, true);
 578         if (! c) {
 579                 /* Couldn't create client structure, so KILL the service to
 580                  * keep network status consistent ... */
 581                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 582                     Client_Conn(Client));
 583                 Kill_Nick(nick, "Server error");
 584                 return CONNECTED;
 585         }
 586
 587         Client_Introduce(Client, c, CLIENT_SERVICE);
 588         return CONNECTED;
 589 } /* IRC_SERVICE */
 590
 591 /**
 592  * Handler for the IRC "WEBIRC" command.
 593  *
 594  * @param Client The client from which this command has been received.
 595  * @param Req Request structure with prefix and all parameters.
 596  * @return CONNECTED or DISCONNECTED.
 597  */
 598 GLOBAL bool
 599 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 600 {
 601         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 4)
 602
 603         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 604                 return IRC_WriteErrClient(Client, ERR_PASSWDMISMATCH_MSG,
 605                                           Client_ID(Client));
 606
 607         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 608                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 609
 610         Client_SetUser(Client, Req->argv[1], true);
 611         Client_SetOrigUser(Client, Req->argv[1]);
 612         Client_SetHostname(Client, Req->argv[2]);
 613         return CONNECTED;
 614 } /* IRC_WEBIRC */
 615
 616 /**
 617  * Handler for the IRC "QUIT" command.
 618  *
 619  * @param Client The client from which this command has been received.
 620  * @param Req Request structure with prefix and all parameters.
 621  * @return CONNECTED or DISCONNECTED.
 622  */
 623 GLOBAL bool
 624 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 625 {
 626         CLIENT *target;
 627         char quitmsg[LINE_LEN];
 628
 629         assert(Client != NULL);
 630         assert(Req != NULL);
 631
 632         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
 633
 634         if (Req->argc == 1)
 635                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 636
 637         if (Client_Type(Client) == CLIENT_SERVER) {
 638                 /* Server */
 639                 target = Client_Search(Req->prefix);
 640                 if (!target) {
 641                         Log(LOG_WARNING,
 642                             "Got QUIT from %s for unknown client!?",
 643                             Client_ID(Client));
 644                         return CONNECTED;
 645                 }
 646
 647                 if (target != Client) {
 648                         Client_Destroy(target, "Got QUIT command",
 649                                        Req->argc == 1 ? quitmsg : NULL, true);
 650                         return CONNECTED;
 651                 } else {
 652                         Conn_Close(Client_Conn(Client), "Got QUIT command",
 653                                    Req->argc == 1 ? quitmsg : NULL, true);
 654                         return DISCONNECTED;
 655                 }
 656         } else {
 657                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 658                         /* " " to avoid confusion */
 659                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 660                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 661                         strlcat(quitmsg, "\"", sizeof quitmsg );
 662                 }
 663
 664                 /* User, Service, or not yet registered */
 665                 Conn_Close(Client_Conn(Client), "Got QUIT command",
 666                            Req->argc == 1 ? quitmsg : NULL, true);
 667
 668                 return DISCONNECTED;
 669         }
 670 } /* IRC_QUIT */
 671
 672 #ifndef STRICT_RFC
 673
 674 /**
 675  * Handler for HTTP command, e.g. GET and POST
 676  *
 677  * We handle these commands here to avoid the quite long timeout when
 678  * some user tries to access this IRC daemon using an web browser ...
 679  *
 680  * @param Client The client from which this command has been received.
 681  * @param Req Request structure with prefix and all parameters.
 682  * @return CONNECTED or DISCONNECTED.
 683  */
 684 GLOBAL bool
 685 IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
 686 {
 687         Req->argc = 1;
 688         Req->argv[0] = "Oops, HTTP request received? This is IRC!";
 689         return IRC_QUIT(Client, Req);
 690 } /* IRC_QUIT_HTTP */
 691
 692 #endif
 693
 694 /**
 695  * Handler for the IRC "PING" command.
 696  *
 697  * @param Client The client from which this command has been received.
 698  * @param Req Request structure with prefix and all parameters.
 699  * @return CONNECTED or DISCONNECTED.
 700  */
 701 GLOBAL bool
 702 IRC_PING(CLIENT *Client, REQUEST *Req)
 703 {
 704         CLIENT *target, *from;
 705
 706         assert(Client != NULL);
 707         assert(Req != NULL);
 708
 709         if (Req->argc < 1)
 710                 return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 711                                           Client_ID(Client));
 712 #ifdef STRICT_RFC
 713         /* Don't ignore additional arguments when in "strict" mode */
 714         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 715 #endif
 716
 717         if (Req->argc > 1) {
 718                 /* A target has been specified ... */
 719                 target = Client_Search(Req->argv[1]);
 720
 721                 if (!target || Client_Type(target) != CLIENT_SERVER)
 722                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 723                                         Client_ID(Client), Req->argv[1]);
 724
 725                 if (target != Client_ThisServer()) {
 726                         /* Ok, we have to forward the PING */
 727                         if (Client_Type(Client) == CLIENT_SERVER)
 728                                 from = Client_Search(Req->prefix);
 729                         else
 730                                 from = Client;
 731                         if (!from)
 732                                 return IRC_WriteErrClient(Client,
 733                                                 ERR_NOSUCHSERVER_MSG,
 734                                                 Client_ID(Client), Req->prefix);
 735
 736                         return IRC_WriteStrClientPrefix(target, from,
 737                                         "PING %s :%s", Req->argv[0],
 738                                         Req->argv[1] );
 739                 }
 740         }
 741
 742         if (Client_Type(Client) == CLIENT_SERVER) {
 743                 if (Req->prefix)
 744                         from = Client_Search(Req->prefix);
 745                 else
 746                         from = Client;
 747         } else
 748                 from = Client_ThisServer();
 749         if (!from)
 750                 return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 751                                         Client_ID(Client), Req->prefix);
 752
 753         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 754             Client_Conn(Client));
 755
 756 #ifdef STRICT_RFC
 757         return IRC_WriteStrClient(Client, "PONG %s :%s",
 758                 Client_ID(from), Client_ID(Client));
 759 #else
 760         /* Some clients depend on the argument being returned in the PONG
 761          * reply (not mentioned in any RFC, though) */
 762         return IRC_WriteStrClient(Client, "PONG %s :%s",
 763                 Client_ID(from), Req->argv[0]);
 764 #endif
 765 } /* IRC_PING */
 766
 767 /**
 768  * Handler for the IRC "PONG" command.
 769  *
 770  * @param Client The client from which this command has been received.
 771  * @param Req Request structure with prefix and all parameters.
 772  * @return CONNECTED or DISCONNECTED.
 773  */
 774 GLOBAL bool
 775 IRC_PONG(CLIENT *Client, REQUEST *Req)
 776 {
 777         CLIENT *target, *from;
 778         CONN_ID conn;
 779 #ifndef STRICT_RFC
 780         long auth_ping;
 781 #endif
 782         char *s;
 783
 784         assert(Client != NULL);
 785         assert(Req != NULL);
 786
 787         /* Wrong number of arguments? */
 788         if (Req->argc < 1) {
 789                 if (Client_Type(Client) == CLIENT_USER)
 790                         return IRC_WriteErrClient(Client, ERR_NOORIGIN_MSG,
 791                                                   Client_ID(Client));
 792                 else
 793                         return CONNECTED;
 794         }
 795         if (Client_Type(Client) == CLIENT_USER) {
 796                 _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 797         }
 798
 799         /* Forward? */
 800         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 801                 target = Client_Search(Req->argv[0]);
 802                 if (!target)
 803                         return IRC_WriteErrClient(Client, ERR_NOSUCHSERVER_MSG,
 804                                         Client_ID(Client), Req->argv[0]);
 805
 806                 from = Client_Search(Req->prefix);
 807
 808                 if (target != Client_ThisServer() && target != from) {
 809                         /* Ok, we have to forward the message. */
 810                         if (!from)
 811                                 return IRC_WriteErrClient(Client,
 812                                                 ERR_NOSUCHSERVER_MSG,
 813                                                 Client_ID(Client), Req->prefix);
 814
 815                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 816                                 s = Client_ID(from);
 817                         else
 818                                 s = Req->argv[0];
 819                         return IRC_WriteStrClientPrefix(target, from,
 820                                  "PONG %s :%s", s, Req->argv[1]);
 821                 }
 822         }
 823
 824         /* The connection timestamp has already been updated when the data has
 825          * been read from so socket, so we don't need to update it here. */
 826
 827         conn = Client_Conn(Client);
 828
 829 #ifndef STRICT_RFC
 830         /* Check authentication PING-PONG ... */
 831         auth_ping = Conn_GetAuthPing(conn);
 832         if (auth_ping) {
 833                 LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
 834                          auth_ping, Req->argv[0]);
 835                 if (auth_ping == atoi(Req->argv[0])) {
 836                         Conn_SetAuthPing(conn, 0);
 837                         if (Client_Type(Client) == CLIENT_WAITAUTHPING)
 838                                 Login_User(Client);
 839                 } else
 840                         if (!IRC_WriteStrClient(Client,
 841                                         "To connect, type /QUOTE PONG %ld",
 842                                         auth_ping))
 843                                 return DISCONNECTED;
 844         }
 845 #endif
 846
 847         if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
 848                 Log(LOG_INFO,
 849                     "Synchronization with \"%s\" done (connection %d): %ld second%s [%ld users, %ld channels].",
 850                     Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
 851                     time(NULL) - Conn_GetSignon(conn) == 1 ? "" : "s",
 852                     Client_UserCount(), Channel_CountVisible(NULL));
 853                 Conn_UpdatePing(conn);
 854         } else
 855                 LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
 856                          conn, time(NULL) - Conn_LastPing(conn));
 857
 858         return CONNECTED;
 859 } /* IRC_PONG */
 860
 861 /**
 862  * Kill all users with a specific nickname in the network.
 863  *
 864  * @param Nick Nickname.
 865  * @param Reason Reason for the KILL.
 866  */
 867 static void
 868 Kill_Nick(char *Nick, char *Reason)
 869 {
 870         REQUEST r;
 871
 872         assert (Nick != NULL);
 873         assert (Reason != NULL);
 874
 875         r.prefix = NULL;
 876         r.argv[0] = Nick;
 877         r.argv[1] = Reason;
 878         r.argc = 2;
 879
 880         Log(LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s!",
 881             Nick, Reason);
 882
 883         IRC_KILL(Client_ThisServer(), &r);
 884 } /* Kill_Nick */
 885
 886 /**
 887  * Change the nickname of a client.
 888  *
 889  * @param Origin The client which caused the nickname change.
 890  * @param Target The client of which the nickname should be changed.
 891  * @param NewNick The new nickname.
 892  */
 893 static void
 894 Change_Nick(CLIENT *Origin, CLIENT *Target, char *NewNick, bool InformClient)
 895 {
 896         if (Client_Conn(Target) > NONE) {
 897                 /* Local client */
 898                 Log(LOG_INFO,
 899                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 900                     Client_TypeText(Target), Client_Mask(Target),
 901                     Client_Conn(Target), Client_ID(Target), NewNick);
 902                 Conn_UpdateIdle(Client_Conn(Target));
 903         } else {
 904                 /* Remote client */
 905                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 906                          Client_TypeText(Target),
 907                          Client_Mask(Target), Client_ID(Target), NewNick);
 908         }
 909
 910         /* Inform all servers and users (which have to know) of the new name */
 911         if (InformClient) {
 912                 IRC_WriteStrClientPrefix(Target, Target, "NICK :%s", NewNick);
 913                 IRC_WriteStrServersPrefix(NULL, Target, "NICK :%s", NewNick);
 914         } else
 915                 IRC_WriteStrServersPrefix(Origin, Target, "NICK :%s", NewNick);
 916         IRC_WriteStrRelatedPrefix(Target, Target, false, "NICK :%s", NewNick);
 917
 918         /* Register old nickname for WHOWAS queries */
 919         Client_RegisterWhowas(Target);
 920
 921         /* Save new nickname */
 922         Client_SetID(Target, NewNick);
 923 }
 924
 925 /* -eof- */