src/ngircd/irc-login.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2011 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-write.h"
  37
  38 #include "exp.h"
  39 #include "irc-login.h"
  40
  41 static void Kill_Nick PARAMS((char *Nick, char *Reason));
  42 static void Change_Nick PARAMS((CLIENT * Origin, CLIENT * Target,
  43                                 char *NewNick, bool RegisterWhowas));
  44
  45
  46 /**
  47  * Handler for the IRC "PASS" command.
  48  *
  49  * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
  50  *
  51  * @param Client        The client from which this command has been received.
  52  * @param Req           Request structure with prefix and all parameters.
  53  * @returns             CONNECTED or DISCONNECTED.
  54  */
  55 GLOBAL bool
  56 IRC_PASS( CLIENT *Client, REQUEST *Req )
  57 {
  58         char *type, *orig_flags;
  59         int protohigh, protolow;
  60
  61         assert( Client != NULL );
  62         assert( Req != NULL );
  63
  64         /* Return an error if this is not a local client */
  65         if (Client_Conn(Client) <= NONE)
  66                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  67                                           Client_ID(Client), Req->command);
  68
  69         if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
  70                 /* Not yet registered "unknown" connection, PASS with one
  71                  * argument: either a regular client, service, or server
  72                  * using the old RFC 1459 section 4.1.1 syntax. */
  73                 LogDebug("Connection %d: got PASS command (RFC 1459) ...",
  74                          Client_Conn(Client));
  75         } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
  76                     Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
  77                    (Req->argc == 3 || Req->argc == 4)) {
  78                 /* Not yet registered "unknown" connection or outgoing server
  79                  * link, PASS with three or four argument: server using the
  80                  * RFC 2813 section 4.1.1 syntax. */
  81                 LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
  82                          Client_Conn(Client));
  83         } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
  84                    Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
  85                 /* Unregistered connection, but wrong number of arguments: */
  86                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  87                                           Client_ID(Client), Req->command);
  88         } else {
  89                 /* Registered connection, PASS command is not allowed! */
  90                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
  91                                           Client_ID(Client));
  92         }
  93
  94         Conn_SetPassword(Client_Conn(Client), Req->argv[0]);
  95
  96         /* Protocol version */
  97         if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
  98                 int c2, c4;
  99
 100                 c2 = Req->argv[1][2];
 101                 c4 = Req->argv[1][4];
 102
 103                 Req->argv[1][4] = '\0';
 104                 protolow = atoi(&Req->argv[1][2]);
 105                 Req->argv[1][2] = '\0';
 106                 protohigh = atoi(Req->argv[1]);
 107
 108                 Req->argv[1][2] = c2;
 109                 Req->argv[1][4] = c4;
 110
 111                 Client_SetType(Client, CLIENT_GOTPASS_2813);
 112         } else {
 113                 protohigh = protolow = 0;
 114                 Client_SetType(Client, CLIENT_GOTPASS);
 115         }
 116
 117         /* Protocol type, see doc/Protocol.txt */
 118         if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
 119                 type = &Req->argv[1][4];
 120         else
 121                 type = NULL;
 122
 123         /* Protocol flags/options */
 124         if (Req->argc >= 4)
 125                 orig_flags = Req->argv[3];
 126         else
 127                 orig_flags = "";
 128
 129         /* Implementation, version and IRC+ flags */
 130         if (Req->argc >= 3) {
 131                 char *impl, *ptr, *serverver, *flags;
 132
 133                 impl = Req->argv[2];
 134                 ptr = strchr(impl, '|');
 135                 if (ptr)
 136                         *ptr = '\0';
 137
 138                 if (type && strcmp(type, PROTOIRCPLUS) == 0) {
 139                         /* The peer seems to be a server which supports the
 140                          * IRC+ protocol (see doc/Protocol.txt). */
 141                         serverver = ptr ? ptr + 1 : "?";
 142                         flags = strchr(ptr ? serverver : impl, ':');
 143                         if (flags) {
 144                                 *flags = '\0';
 145                                 flags++;
 146                         } else
 147                                 flags = "";
 148                         Log(LOG_INFO,
 149                             "Peer on conenction %d announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
 150                             Client_Conn(Client), impl, serverver,
 151                             protohigh, protolow, flags);
 152                 } else {
 153                         /* The peer seems to be a server supporting the
 154                          * "original" IRC protocol (RFC 2813). */
 155                         if (strchr(orig_flags, 'Z'))
 156                                 flags = "Z";
 157                         else
 158                                 flags = "";
 159                         Log(LOG_INFO,
 160                             "Peer on connection %d announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
 161                             Client_Conn(Client), impl,
 162                             protohigh, protolow, flags);
 163                 }
 164                 Client_SetFlags(Client, flags);
 165         }
 166
 167         return CONNECTED;
 168 } /* IRC_PASS */
 169
 170
 171 /**
 172  * Handler for the IRC "NICK" command.
 173  *
 174  * See RFC 2812, 3.1.2 "Nick message", and RFC 2813, 4.1.3 "Nick".
 175  *
 176  * This function implements the IRC command "NICK" which is used to register
 177  * with the server, to change already registered nicknames and to introduce
 178  * new users which are connected to other servers.
 179  *
 180  * @param Client        The client from which this command has been received.
 181  * @param Req           Request structure with prefix and all parameters.
 182  * @returns             CONNECTED or DISCONNECTED.
 183  */
 184 GLOBAL bool
 185 IRC_NICK( CLIENT *Client, REQUEST *Req )
 186 {
 187         CLIENT *intr_c, *target, *c;
 188         char *nick, *user, *hostname, *modes, *info;
 189         int token, hops;
 190
 191         assert( Client != NULL );
 192         assert( Req != NULL );
 193
 194         /* Some IRC clients, for example BitchX, send the NICK and USER
 195          * commands in the wrong order ... */
 196         if(Client_Type(Client) == CLIENT_UNKNOWN
 197             || Client_Type(Client) == CLIENT_GOTPASS
 198             || Client_Type(Client) == CLIENT_GOTNICK
 199 #ifndef STRICT_RFC
 200             || Client_Type(Client) == CLIENT_GOTUSER
 201 #endif
 202             || Client_Type(Client) == CLIENT_USER
 203             || Client_Type(Client) == CLIENT_SERVICE
 204             || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
 205         {
 206                 /* User registration or change of nickname */
 207
 208                 /* Wrong number of arguments? */
 209                 if( Req->argc != 1 )
 210                         return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 211                                                    Client_ID( Client ),
 212                                                    Req->command );
 213
 214                 /* Search "target" client */
 215                 if( Client_Type( Client ) == CLIENT_SERVER )
 216                 {
 217                         target = Client_Search( Req->prefix );
 218                         if( ! target )
 219                                 return IRC_WriteStrClient( Client,
 220                                                            ERR_NOSUCHNICK_MSG,
 221                                                            Client_ID( Client ),
 222                                                            Req->argv[0] );
 223                 }
 224                 else
 225                 {
 226                         /* Is this a restricted client? */
 227                         if( Client_HasMode( Client, 'r' ))
 228                                 return IRC_WriteStrClient( Client,
 229                                                            ERR_RESTRICTED_MSG,
 230                                                            Client_ID( Client ));
 231
 232                         target = Client;
 233                 }
 234
 235 #ifndef STRICT_RFC
 236                 /* If the clients tries to change to its own nickname we won't
 237                  * do anything. This is how the original ircd behaves and some
 238                  * clients (for example Snak) expect it to be like this.
 239                  * But I doubt that this is "really the right thing" ... */
 240                 if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
 241                         return CONNECTED;
 242 #endif
 243
 244                 /* Check that the new nickname is available. Special case:
 245                  * the client only changes from/to upper to lower case. */
 246                 if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
 247                 {
 248                         if( ! Client_CheckNick( target, Req->argv[0] ))
 249                                 return CONNECTED;
 250                 }
 251
 252                 if (Client_Type(target) != CLIENT_USER &&
 253                     Client_Type(target) != CLIENT_SERVICE &&
 254                     Client_Type(target) != CLIENT_SERVER) {
 255                         /* New client */
 256                         LogDebug("Connection %d: got valid NICK command ...",
 257                              Client_Conn( Client ));
 258
 259                         /* Register new nickname of this client */
 260                         Client_SetID( target, Req->argv[0] );
 261
 262 #ifndef STRICT_RFC
 263                         if (Conf_AuthPing) {
 264                                 Conn_SetAuthPing(Client_Conn(Client), rand());
 265                                 IRC_WriteStrClient(Client, "PING :%ld",
 266                                         Conn_GetAuthPing(Client_Conn(Client)));
 267                                 LogDebug("Connection %d: sent AUTH PING %ld ...",
 268                                         Client_Conn(Client),
 269                                         Conn_GetAuthPing(Client_Conn(Client)));
 270                         }
 271 #endif
 272
 273                         /* If we received a valid USER command already then
 274                          * register the new client! */
 275                         if( Client_Type( Client ) == CLIENT_GOTUSER )
 276                                 return Login_User( Client );
 277                         else
 278                                 Client_SetType( Client, CLIENT_GOTNICK );
 279                 } else {
 280                         /* Nickname change */
 281                         Change_Nick(Client, target, Req->argv[0], true);
 282                         IRC_SetPenalty(target, 2);
 283                 }
 284
 285                 return CONNECTED;
 286         } else if(Client_Type(Client) == CLIENT_SERVER ||
 287                   Client_Type(Client) == CLIENT_SERVICE) {
 288                 /* Server or service introduces new client */
 289
 290                 /* Bad number of parameters? */
 291                 if (Req->argc != 2 && Req->argc != 7)
 292                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 293                                                   Client_ID(Client), Req->command);
 294
 295                 if (Req->argc >= 7) {
 296                         /* RFC 2813 compatible syntax */
 297                         nick = Req->argv[0];
 298                         hops = atoi(Req->argv[1]);
 299                         user = Req->argv[2];
 300                         hostname = Req->argv[3];
 301                         token = atoi(Req->argv[4]);
 302                         modes = Req->argv[5] + 1;
 303                         info = Req->argv[6];
 304                 } else {
 305                         /* RFC 1459 compatible syntax */
 306                         nick = Req->argv[0];
 307                         hops = 1;
 308                         user = Req->argv[0];
 309                         hostname = Client_ID(Client);
 310                         token = atoi(Req->argv[1]);
 311                         modes = "";
 312                         info = Req->argv[0];
 313                 }
 314
 315                 c = Client_Search(nick);
 316                 if(c) {
 317                         /*
 318                          * the new nick is already present on this server:
 319                          * the new and the old one have to be disconnected now.
 320                          */
 321                         Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
 322                         Kill_Nick( Req->argv[0], "Nick collision" );
 323                         return CONNECTED;
 324                 }
 325
 326                 /* Find the Server this client is connected to */
 327                 intr_c = Client_GetFromToken(Client, token);
 328                 if( ! intr_c )
 329                 {
 330                         Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
 331                         Kill_Nick( Req->argv[0], "Unknown server" );
 332                         return CONNECTED;
 333                 }
 334
 335                 c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
 336                                          token, modes, info, true);
 337                 if( ! c )
 338                 {
 339                         /* out of memory, need to disconnect client to keep network state consistent */
 340                         Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
 341                         Kill_Nick( Req->argv[0], "Server error" );
 342                         return CONNECTED;
 343                 }
 344
 345                 /* RFC 2813: client is now fully registered, inform all the
 346                  * other servers about the new user.
 347                  * RFC 1459: announce the new client only after receiving the
 348                  * USER command, first we need more information! */
 349                 if (Req->argc < 7) {
 350                         LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
 351                                  Client_Mask(c));
 352                         Client_SetType(c, CLIENT_GOTNICK);
 353                 } else
 354                         Client_Introduce(Client, c, CLIENT_USER);
 355
 356                 return CONNECTED;
 357         }
 358         else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
 359 } /* IRC_NICK */
 360
 361
 362 /**
 363  * Handler for the IRC "USER" command.
 364  *
 365  * See RFC 2812, 3.1.3 "User message".
 366  *
 367  * @param Client        The client from which this command has been received.
 368  * @param Req           Request structure with prefix and all parameters.
 369  * @returns             CONNECTED or DISCONNECTED.
 370  */
 371 GLOBAL bool
 372 IRC_USER(CLIENT * Client, REQUEST * Req)
 373 {
 374         CLIENT *c;
 375         char *ptr;
 376
 377         assert(Client != NULL);
 378         assert(Req != NULL);
 379
 380         if (Client_Type(Client) == CLIENT_GOTNICK ||
 381 #ifndef STRICT_RFC
 382             Client_Type(Client) == CLIENT_UNKNOWN ||
 383 #endif
 384             Client_Type(Client) == CLIENT_GOTPASS)
 385         {
 386                 /* New connection */
 387                 if (Req->argc != 4)
 388                         return IRC_WriteStrClient(Client,
 389                                                   ERR_NEEDMOREPARAMS_MSG,
 390                                                   Client_ID(Client),
 391                                                   Req->command);
 392
 393                 /* User name: only alphanumeric characters and limited
 394                    punctuation is allowed.*/
 395                 ptr = Req->argv[0];
 396                 while (*ptr) {
 397                         if (!isalnum(*ptr) &&
 398                             *ptr != '+' && *ptr != '-' &&
 399                             *ptr != '.' && *ptr != '_') {
 400                                 Conn_Close(Client_Conn(Client), NULL,
 401                                            "Invalid user name", true);
 402                                 return DISCONNECTED;
 403                         }
 404                         ptr++;
 405                 }
 406
 407 #ifdef IDENTAUTH
 408                 ptr = Client_User(Client);
 409                 if (!ptr || !*ptr || *ptr == '~')
 410                         Client_SetUser(Client, Req->argv[0], false);
 411 #else
 412                 Client_SetUser(Client, Req->argv[0], false);
 413 #endif
 414                 Client_SetOrigUser(Client, Req->argv[0]);
 415
 416                 /* "Real name" or user info text: Don't set it to the empty
 417                  * string, the original ircd can't deal with such "real names"
 418                  * (e. g. "USER user * * :") ... */
 419                 if (*Req->argv[3])
 420                         Client_SetInfo(Client, Req->argv[3]);
 421                 else
 422                         Client_SetInfo(Client, "-");
 423
 424                 LogDebug("Connection %d: got valid USER command ...",
 425                     Client_Conn(Client));
 426                 if (Client_Type(Client) == CLIENT_GOTNICK)
 427                         return Login_User(Client);
 428                 else
 429                         Client_SetType(Client, CLIENT_GOTUSER);
 430                 return CONNECTED;
 431
 432         } else if (Client_Type(Client) == CLIENT_SERVER ||
 433                    Client_Type(Client) == CLIENT_SERVICE) {
 434                 /* Server/service updating an user */
 435                 if (Req->argc != 4)
 436                         return IRC_WriteStrClient(Client,
 437                                                   ERR_NEEDMOREPARAMS_MSG,
 438                                                   Client_ID(Client),
 439                                                   Req->command);
 440                 c = Client_Search(Req->prefix);
 441                 if (!c)
 442                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 443                                                   Client_ID(Client),
 444                                                   Req->prefix);
 445
 446                 Client_SetUser(c, Req->argv[0], true);
 447                 Client_SetOrigUser(c, Req->argv[0]);
 448                 Client_SetHostname(c, Req->argv[1]);
 449                 Client_SetInfo(c, Req->argv[3]);
 450
 451                 LogDebug("Connection %d: got valid USER command for \"%s\".",
 452                          Client_Conn(Client), Client_Mask(c));
 453
 454                 /* RFC 1459 style user registration?
 455                  * Introduce client to network: */
 456                 if (Client_Type(c) == CLIENT_GOTNICK)
 457                         Client_Introduce(Client, c, CLIENT_USER);
 458
 459                 return CONNECTED;
 460         } else if (Client_Type(Client) == CLIENT_USER) {
 461                 /* Already registered connection */
 462                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 463                                           Client_ID(Client));
 464         } else {
 465                 /* Unexpected/invalid connection state? */
 466                 return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
 467                                           Client_ID(Client));
 468         }
 469 } /* IRC_USER */
 470
 471
 472 /**
 473  * Handler for the IRC "SERVICE" command.
 474  *
 475  * This function implements IRC Services registration using the SERVICE command
 476  * defined in RFC 2812 3.1.6 and RFC 2813 4.1.4.
 477  *
 478  * At the moment ngIRCd doesn't support directly linked services, so this
 479  * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
 480  * received from a peer server.
 481  *
 482  * @param Client        The client from which this command has been received.
 483  * @param Req           Request structure with prefix and all parameters.
 484  * @returns             CONNECTED or DISCONNECTED..
 485  */
 486 GLOBAL bool
 487 IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 488 {
 489         CLIENT *c, *intr_c;
 490         char *nick, *user, *host, *info, *modes, *ptr;
 491         int token, hops;
 492
 493         assert(Client != NULL);
 494         assert(Req != NULL);
 495
 496         if (Client_Type(Client) != CLIENT_GOTPASS &&
 497             Client_Type(Client) != CLIENT_SERVER)
 498                 return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
 499                                           Client_ID(Client));
 500
 501         if (Req->argc != 6)
 502                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 503                                           Client_ID(Client), Req->command);
 504
 505         if (Client_Type(Client) != CLIENT_SERVER)
 506                 return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
 507                                   Client_ID(Client), Req->argv[0]);
 508
 509         /* Bad number of parameters? */
 510         if (Req->argc != 6)
 511                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 512                                           Client_ID(Client), Req->command);
 513
 514         nick = Req->argv[0];
 515         user = NULL; host = NULL;
 516         token = atoi(Req->argv[1]);
 517         hops = atoi(Req->argv[4]);
 518         info = Req->argv[5];
 519
 520         /* Validate service name ("nickname") */
 521         c = Client_Search(nick);
 522         if(c) {
 523                 /* Nickname collission: disconnect (KILL) both clients! */
 524                 Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
 525                     Client_ID(Client), nick);
 526                 Kill_Nick(nick, "Nick collision");
 527                 return CONNECTED;
 528         }
 529
 530         /* Get the server to which the service is connected */
 531         intr_c = Client_GetFromToken(Client, token);
 532         if (! intr_c) {
 533                 Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
 534                     Client_ID(Client), nick);
 535                 Kill_Nick(nick, "Unknown server");
 536                 return CONNECTED;
 537         }
 538
 539         /* Get user and host name */
 540         ptr = strchr(nick, '@');
 541         if (ptr) {
 542                 *ptr = '\0';
 543                 host = ++ptr;
 544         }
 545         if (!host)
 546                 host = Client_Hostname(intr_c);
 547         ptr = strchr(nick, '!');
 548         if (ptr) {
 549                 *ptr = '\0';
 550                 user = ++ptr;
 551         }
 552         if (!user)
 553                 user = nick;
 554
 555         /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
 556          * for future usage"; but we use it to transfer the modes and check
 557          * that the first character is a '+' sign and ignore it otherwise. */
 558         modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
 559
 560         c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
 561                                  token, modes, info, true);
 562         if (! c) {
 563                 /* Couldn't create client structure, so KILL the service to
 564                  * keep network status consistent ... */
 565                 Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
 566                     Client_Conn(Client));
 567                 Kill_Nick(nick, "Server error");
 568                 return CONNECTED;
 569         }
 570
 571         Client_Introduce(Client, c, CLIENT_SERVICE);
 572         return CONNECTED;
 573 } /* IRC_SERVICE */
 574
 575
 576 /**
 577  * Handler for the IRC "WEBIRC" command.
 578  *
 579  * See doc/Protocol.txt, section II.4:
 580  * "Update webchat/proxy client information".
 581  *
 582  * @param Client        The client from which this command has been received.
 583  * @param Req           Request structure with prefix and all parameters.
 584  * @returns             CONNECTED or DISCONNECTED.
 585  */
 586 GLOBAL bool
 587 IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
 588 {
 589         /* Exactly 4 parameters are requited */
 590         if (Req->argc != 4)
 591                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 592                                           Client_ID(Client), Req->command);
 593
 594         if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
 595                 return IRC_WriteStrClient(Client, ERR_PASSWDMISMATCH_MSG,
 596                                           Client_ID(Client));
 597
 598         LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
 599                  Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
 600
 601         Client_SetUser(Client, Req->argv[1], true);
 602         Client_SetOrigUser(Client, Req->argv[1]);
 603         Client_SetHostname(Client, Req->argv[2]);
 604         return CONNECTED;
 605 } /* IRC_WEBIRC */
 606
 607
 608 /**
 609  * Handler for the IRC "QUIT" command.
 610  *
 611  * See RFC 2812, 3.1.7 "Quit", and RFC 2813, 4.1.5 "Quit".
 612  *
 613  * @param Client        The client from which this command has been received.
 614  * @param Req           Request structure with prefix and all parameters.
 615  * @returns             CONNECTED or DISCONNECTED.
 616  */
 617 GLOBAL bool
 618 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 619 {
 620         CLIENT *target;
 621         char quitmsg[LINE_LEN];
 622
 623         assert(Client != NULL);
 624         assert(Req != NULL);
 625
 626         /* Wrong number of arguments? */
 627         if (Req->argc > 1)
 628                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 629                                           Client_ID(Client), Req->command);
 630
 631         if (Req->argc == 1)
 632                 strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
 633
 634         if (Client_Type(Client) == CLIENT_SERVER) {
 635                 /* Server */
 636                 target = Client_Search(Req->prefix);
 637                 if (!target) {
 638                         Log(LOG_WARNING,
 639                             "Got QUIT from %s for unknown client!?",
 640                             Client_ID(Client));
 641                         return CONNECTED;
 642                 }
 643
 644                 if (target != Client) {
 645                         Client_Destroy(target, "Got QUIT command.",
 646                                        Req->argc == 1 ? quitmsg : NULL, true);
 647                         return CONNECTED;
 648                 } else {
 649                         Conn_Close(Client_Conn(Client), "Got QUIT command.",
 650                                    Req->argc == 1 ? quitmsg : NULL, true);
 651                         return DISCONNECTED;
 652                 }
 653         } else {
 654                 if (Req->argc == 1 && quitmsg[0] != '\"') {
 655                         /* " " to avoid confusion */
 656                         strlcpy(quitmsg, "\"", sizeof quitmsg);
 657                         strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
 658                         strlcat(quitmsg, "\"", sizeof quitmsg );
 659                 }
 660
 661                 /* User, Service, or not yet registered */
 662                 Conn_Close(Client_Conn(Client), "Got QUIT command.",
 663                            Req->argc == 1 ? quitmsg : NULL, true);
 664
 665                 return DISCONNECTED;
 666         }
 667 } /* IRC_QUIT */
 668
 669
 670 #ifndef STRICT_RFC
 671
 672 /**
 673  * Handler for HTTP command, e.g. GET and POST
 674  *
 675  * We handle these commands here to avoid the quite long timeout when
 676  * some user tries to access this IRC daemon using an web browser ...
 677  *
 678  * @param Client        The client from which this command has been received.
 679  * @param Req           Request structure with prefix and all parameters.
 680  * @returns             CONNECTED or DISCONNECTED.
 681  */
 682 GLOBAL bool
 683 IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
 684 {
 685         Req->argc = 1;
 686         Req->argv[0] = "Oops, HTTP request received? This is IRC!";
 687         return IRC_QUIT(Client, Req);
 688 } /* IRC_QUIT_HTTP */
 689
 690 #endif
 691
 692
 693 /**
 694  * Handler for the IRC "PING" command.
 695  *
 696  * See RFC 2812, 3.7.2 "Ping message".
 697  *
 698  * @param Client        The client from which this command has been received.
 699  * @param Req           Request structure with prefix and all parameters.
 700  * @returns             CONNECTED or DISCONNECTED.
 701  */
 702 GLOBAL bool
 703 IRC_PING(CLIENT *Client, REQUEST *Req)
 704 {
 705         CLIENT *target, *from;
 706
 707         assert(Client != NULL);
 708         assert(Req != NULL);
 709
 710         if (Req->argc < 1)
 711                 return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 712                                           Client_ID(Client));
 713 #ifdef STRICT_RFC
 714         /* Don't ignore additional arguments when in "strict" mode */
 715         if (Req->argc > 2)
 716                  return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 717                                            Client_ID(Client), Req->command);
 718 #endif
 719
 720         if (Req->argc > 1) {
 721                 /* A target has been specified ... */
 722                 target = Client_Search(Req->argv[1]);
 723
 724                 if (!target || Client_Type(target) != CLIENT_SERVER)
 725                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 726                                         Client_ID(Client), Req->argv[1]);
 727
 728                 if (target != Client_ThisServer()) {
 729                         /* Ok, we have to forward the PING */
 730                         if (Client_Type(Client) == CLIENT_SERVER)
 731                                 from = Client_Search(Req->prefix);
 732                         else
 733                                 from = Client;
 734                         if (!from)
 735                                 return IRC_WriteStrClient(Client,
 736                                                 ERR_NOSUCHSERVER_MSG,
 737                                                 Client_ID(Client), Req->prefix);
 738
 739                         return IRC_WriteStrClientPrefix(target, from,
 740                                         "PING %s :%s", Req->argv[0],
 741                                         Req->argv[1] );
 742                 }
 743         }
 744
 745         if (Client_Type(Client) == CLIENT_SERVER) {
 746                 if (Req->prefix)
 747                         from = Client_Search(Req->prefix);
 748                 else
 749                         from = Client;
 750         } else
 751                 from = Client_ThisServer();
 752         if (!from)
 753                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 754                                         Client_ID(Client), Req->prefix);
 755
 756         Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
 757             Client_Conn(Client));
 758
 759 #ifdef STRICT_RFC
 760         return IRC_WriteStrClient(Client, "PONG %s :%s",
 761                 Client_ID(from), Client_ID(Client));
 762 #else
 763         /* Some clients depend on the argument being returned in the PONG
 764          * reply (not mentioned in any RFC, though) */
 765         return IRC_WriteStrClient(Client, "PONG %s :%s",
 766                 Client_ID(from), Req->argv[0]);
 767 #endif
 768 } /* IRC_PING */
 769
 770
 771 /**
 772  * Handler for the IRC "PONG" command.
 773  *
 774  * See RFC 2812, 3.7.3 "Pong message".
 775  *
 776  * @param Client        The client from which this command has been received.
 777  * @param Req           Request structure with prefix and all parameters.
 778  * @returns             CONNECTED or DISCONNECTED.
 779  */
 780 GLOBAL bool
 781 IRC_PONG(CLIENT *Client, REQUEST *Req)
 782 {
 783         CLIENT *target, *from;
 784         CONN_ID conn;
 785 #ifndef STRICT_RFC
 786         long auth_ping;
 787 #endif
 788         char *s;
 789
 790         assert(Client != NULL);
 791         assert(Req != NULL);
 792
 793         /* Wrong number of arguments? */
 794         if (Req->argc < 1) {
 795                 if (Client_Type(Client) == CLIENT_USER)
 796                         return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
 797                                                   Client_ID(Client));
 798                 else
 799                         return CONNECTED;
 800         }
 801         if (Req->argc > 2) {
 802                 if (Client_Type(Client) == CLIENT_USER)
 803                         return IRC_WriteStrClient(Client,
 804                                                   ERR_NEEDMOREPARAMS_MSG,
 805                                                   Client_ID(Client),
 806                                                   Req->command);
 807                 else
 808                         return CONNECTED;
 809         }
 810
 811         /* Forward? */
 812         if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
 813                 target = Client_Search(Req->argv[0]);
 814                 if (!target)
 815                         return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 816                                         Client_ID(Client), Req->argv[0]);
 817
 818                 from = Client_Search(Req->prefix);
 819
 820                 if (target != Client_ThisServer() && target != from) {
 821                         /* Ok, we have to forward the message. */
 822                         if (!from)
 823                                 return IRC_WriteStrClient(Client,
 824                                                 ERR_NOSUCHSERVER_MSG,
 825                                                 Client_ID(Client), Req->prefix);
 826
 827                         if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
 828                                 s = Client_ID(from);
 829                         else
 830                                 s = Req->argv[0];
 831                         return IRC_WriteStrClientPrefix(target, from,
 832                                  "PONG %s :%s", s, Req->argv[1]);
 833                 }
 834         }
 835
 836         /* The connection timestamp has already been updated when the data has
 837          * been read from so socket, so we don't need to update it here. */
 838
 839         conn = Client_Conn(Client);
 840
 841 #ifndef STRICT_RFC
 842         /* Check authentication PING-PONG ... */
 843         auth_ping = Conn_GetAuthPing(conn);
 844         if (auth_ping) {
 845                 LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
 846                          auth_ping, Req->argv[0]);
 847                 if (auth_ping == atoi(Req->argv[0])) {
 848                         Conn_SetAuthPing(conn, 0);
 849                         if (Client_Type(Client) == CLIENT_WAITAUTHPING)
 850                                 Login_User(Client);
 851                 } else
 852                         if (!IRC_WriteStrClient(Client,
 853                                         "To connect, type /QUOTE PONG %ld",
 854                                         auth_ping))
 855                                 return DISCONNECTED;
 856         }
 857 #endif
 858
 859         if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
 860                 Log(LOG_INFO,
 861                     "Synchronization with \"%s\" done (connection %d): %ld seconds [%ld users, %ld channels]",
 862                     Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
 863                     Client_UserCount(), Channel_CountVisible(NULL));
 864                 Conn_UpdatePing(conn);
 865         } else
 866                 LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
 867                          conn, time(NULL) - Conn_LastPing(conn));
 868
 869         return CONNECTED;
 870 } /* IRC_PONG */
 871
 872
 873 /**
 874  * Kill all users with a specific nickname in the network.
 875  *
 876  * @param Nick          Nickname.
 877  * @param Reason        Reason for the KILL.
 878  */
 879 static void
 880 Kill_Nick(char *Nick, char *Reason)
 881 {
 882         REQUEST r;
 883
 884         assert (Nick != NULL);
 885         assert (Reason != NULL);
 886
 887         r.prefix = NULL;
 888         r.argv[0] = Nick;
 889         r.argv[1] = Reason;
 890         r.argc = 2;
 891
 892         Log(LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s",
 893             Nick, Reason);
 894
 895         IRC_KILL(Client_ThisServer(), &r);
 896 } /* Kill_Nick */
 897
 898
 899 /**
 900  * Change the nickname of a client.
 901  *
 902  * @param Origin The client which caused the nickname change.
 903  * @param Target The client of which the nickname should be changed.
 904  * @param NewNick The new nickname.
 905  */
 906 static void
 907 Change_Nick(CLIENT *Origin, CLIENT *Target, char *NewNick, bool RegisterWhowas)
 908 {
 909         if (Client_Conn(Target) > NONE) {
 910                 /* Local client */
 911                 Log(LOG_INFO,
 912                     "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
 913                     Client_TypeText(Target), Client_Mask(Target),
 914                     Client_Conn(Target), Client_ID(Target), NewNick);
 915                 Conn_UpdateIdle(Client_Conn(Target));
 916         } else {
 917                 /* Remote client */
 918                 LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
 919                          Client_TypeText(Target),
 920                          Client_Mask(Target), Client_ID(Target), NewNick);
 921         }
 922
 923         /* Inform all servers and users (which have to know) of the new name */
 924         if (Client_Type(Origin) == CLIENT_USER)
 925                 IRC_WriteStrClientPrefix(Origin, Origin, "NICK :%s", NewNick);
 926         IRC_WriteStrServersPrefix(Origin, Target, "NICK :%s", NewNick);
 927         IRC_WriteStrRelatedPrefix(Target, Target, false, "NICK :%s", NewNick);
 928
 929         /* Register old nickname for WHOWAS queries, if required */
 930         if (RegisterWhowas)
 931                 Client_RegisterWhowas(Target);
 932
 933         /* Save new nickname */
 934         Client_SetID(Target, NewNick);
 935 }
 936
 937
 938 /* -eof- */