src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 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  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-macros.h"
  29 #include "irc-write.h"
  30 #include "lists.h"
  31 #include "log.h"
  32 #include "parse.h"
  33 #include "messages.h"
  34 #include "conf.h"
  35
  36 #include "exp.h"
  37 #include "irc-mode.h"
  38
  39 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  40                                 CLIENT *Target));
  41 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42                                  CHANNEL *Channel));
  43
  44 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  45                                 CHANNEL *Channel, const char *Pattern));
  46 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  47                                   CHANNEL *Channel, const char *Pattern));
  48
  49 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  50                                     CLIENT *Prefix, CLIENT *Client,
  51                                     CHANNEL *Channel, const char *Mask));
  52
  53 /**
  54  * Handler for the IRC "MODE" command.
  55  *
  56  * This function detects whether user or channel modes should be modified
  57  * and calls the appropriate sub-functions.
  58  *
  59  * @param Client The client from which this command has been received.
  60  * @param Req Request structure with prefix and all parameters.
  61  * @return CONNECTED or DISCONNECTED.
  62  */
  63 GLOBAL bool
  64 IRC_MODE( CLIENT *Client, REQUEST *Req )
  65 {
  66         CLIENT *cl, *origin;
  67         CHANNEL *chan;
  68
  69         assert(Client != NULL);
  70         assert(Req != NULL);
  71
  72         _IRC_GET_SENDER_OR_RETURN_(origin, Req, Client)
  73
  74         /* Channel or user mode? */
  75         cl = NULL; chan = NULL;
  76         if (Client_IsValidNick(Req->argv[0]))
  77                 cl = Client_Search(Req->argv[0]);
  78         if (Channel_IsValidName(Req->argv[0]))
  79                 chan = Channel_Search(Req->argv[0]);
  80
  81         if (cl)
  82                 return Client_Mode(Client, Req, origin, cl);
  83         if (chan)
  84                 return Channel_Mode(Client, Req, origin, chan);
  85
  86         /* No target found! */
  87         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
  88                         Client_ID(Client), Req->argv[0]);
  89 } /* IRC_MODE */
  90
  91 /**
  92  * Check if the "mode limit" for a client has been reached.
  93  *
  94  * This limit doesn't apply for servers or services!
  95  *
  96  * @param Client The client to check.
  97  * @param Count The number of modes already handled.
  98  * @return true if the limit has been reached.
  99  */
 100 static bool
 101 Mode_Limit_Reached(CLIENT *Client, int Count)
 102 {
 103         if (Client_Type(Client) == CLIENT_SERVER
 104             || Client_Type(Client) == CLIENT_SERVICE)
 105                 return false;
 106         if (Count < MAX_HNDL_MODES_ARG)
 107                 return false;
 108         return true;
 109 }
 110
 111 /**
 112  * Handle client mode requests
 113  *
 114  * @param Client The client from which this command has been received.
 115  * @param Req Request structure with prefix and all parameters.
 116  * @param Origin The originator of the MODE command (prefix).
 117  * @param Target The target (client) of this MODE command.
 118  * @return CONNECTED or DISCONNECTED.
 119  */
 120 static bool
 121 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 122 {
 123         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 124         bool ok, set;
 125         bool send_RPL_HOSTHIDDEN_MSG = false;
 126         int mode_arg;
 127         size_t len;
 128
 129         /* Is the client allowed to request or change the modes? */
 130         if (Client_Type(Client) == CLIENT_USER) {
 131                 /* Users are only allowed to manipulate their own modes! */
 132                 if (Target != Client)
 133                         return IRC_WriteErrClient(Client,
 134                                                   ERR_USERSDONTMATCH_MSG,
 135                                                   Client_ID(Client));
 136         }
 137
 138         /* Mode request: let's answer it :-) */
 139         if (Req->argc == 1)
 140                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 141                                           Client_ID(Target),
 142                                           Client_Modes(Target));
 143
 144         mode_arg = 1;
 145         mode_ptr = Req->argv[mode_arg];
 146
 147         /* Initial state: set or unset modes? */
 148         if (*mode_ptr == '+') {
 149                 set = true;
 150                 strcpy(the_modes, "+");
 151         } else if (*mode_ptr == '-') {
 152                 set = false;
 153                 strcpy(the_modes, "-");
 154         } else
 155                 return IRC_WriteErrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 156                                           Client_ID(Origin));
 157
 158         x[1] = '\0';
 159         ok = CONNECTED;
 160         while (mode_ptr) {
 161                 mode_ptr++;
 162                 if (!*mode_ptr) {
 163                         /* Try next argument if there's any */
 164                         mode_arg++;
 165                         if (mode_arg < Req->argc)
 166                                 mode_ptr = Req->argv[mode_arg];
 167                         else
 168                                 break;
 169                 }
 170
 171                 switch(*mode_ptr) {
 172                   case '+':
 173                   case '-':
 174                         if ((*mode_ptr == '+' && !set)
 175                             || (*mode_ptr == '-' && set)) {
 176                                 /* Action modifier ("+"/"-") must be changed */
 177                                 len = strlen(the_modes) - 1;
 178                                 if (the_modes[len] == '+'
 179                                     || the_modes[len] == '-') {
 180                                         /* Last character in the "result
 181                                          * string" was an "action", so just
 182                                          * overwrite it with the new action */
 183                                         the_modes[len] = *mode_ptr;
 184                                 } else {
 185                                         /* Append new modifier character to
 186                                          * the resulting mode string */
 187                                         x[0] = *mode_ptr;
 188                                         strlcat(the_modes, x,
 189                                                 sizeof(the_modes));
 190                                 }
 191                                 if (*mode_ptr == '+')
 192                                         set = true;
 193                                 else
 194                                         set = false;
 195                         }
 196                         continue;
 197                 }
 198
 199                 /* Validate modes */
 200                 x[0] = '\0';
 201                 switch (*mode_ptr) {
 202                 case 'b': /* Block private msgs */
 203                 case 'C': /* Only messages from clients sharing a channel */
 204                 case 'i': /* Invisible */
 205                 case 's': /* Server messages */
 206                 case 'w': /* Wallops messages */
 207                         x[0] = *mode_ptr;
 208                         break;
 209                 case 'a': /* Away */
 210                         if (Client_Type(Client) == CLIENT_SERVER) {
 211                                 x[0] = 'a';
 212                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 213                         } else
 214                                 ok = IRC_WriteErrClient(Origin,
 215                                                         ERR_NOPRIVILEGES_MSG,
 216                                                         Client_ID(Origin));
 217                         break;
 218                 case 'B': /* Bot */
 219                         if (Client_HasMode(Client, 'r'))
 220                                 ok = IRC_WriteErrClient(Origin,
 221                                                         ERR_RESTRICTED_MSG,
 222                                                         Client_ID(Origin));
 223                         else
 224                                 x[0] = 'B';
 225                         break;
 226                 case 'c': /* Receive connect notices */
 227                 case 'q': /* KICK-protected user */
 228                           /* (only settable by IRC operators!) */
 229                         if (!set || Client_Type(Client) == CLIENT_SERVER
 230                             || Client_HasMode(Origin, 'o'))
 231                                 x[0] = *mode_ptr;
 232                         else
 233                                 ok = IRC_WriteErrClient(Origin,
 234                                                         ERR_NOPRIVILEGES_MSG,
 235                                                         Client_ID(Origin));
 236                         break;
 237                 case 'o': /* IRC operator (only unsettable!) */
 238                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 239                                 x[0] = 'o';
 240                         } else
 241                                 ok = IRC_WriteErrClient(Origin,
 242                                                         ERR_NOPRIVILEGES_MSG,
 243                                                         Client_ID(Origin));
 244                         break;
 245                 case 'r': /* Restricted (only settable) */
 246                         if (set || Client_Type(Client) == CLIENT_SERVER)
 247                                 x[0] = 'r';
 248                         else
 249                                 ok = IRC_WriteErrClient(Origin,
 250                                                         ERR_RESTRICTED_MSG,
 251                                                         Client_ID(Origin));
 252                         break;
 253                 case 'R': /* Registered (not [un]settable by clients) */
 254                         if (Client_Type(Client) == CLIENT_SERVER)
 255                                 x[0] = 'R';
 256                         else
 257                                 ok = IRC_WriteErrClient(Origin,
 258                                                         ERR_NICKREGISTER_MSG,
 259                                                         Client_ID(Origin));
 260                         break;
 261                 case 'x': /* Cloak hostname */
 262                         if (Client_HasMode(Client, 'r'))
 263                                 ok = IRC_WriteErrClient(Origin,
 264                                                         ERR_RESTRICTED_MSG,
 265                                                         Client_ID(Origin));
 266                         else if (!set || Conf_CloakHostModeX[0]
 267                                  || Client_Type(Client) == CLIENT_SERVER
 268                                  || Client_HasMode(Origin, 'o')) {
 269                                 x[0] = 'x';
 270                                 send_RPL_HOSTHIDDEN_MSG = true;
 271                         } else
 272                                 ok = IRC_WriteErrClient(Origin,
 273                                                         ERR_NOPRIVILEGES_MSG,
 274                                                         Client_ID(Origin));
 275                         break;
 276                 default:
 277                         if (Client_Type(Client) != CLIENT_SERVER) {
 278                                 Log(LOG_DEBUG,
 279                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 280                                     set ? '+' : '-', *mode_ptr,
 281                                     Client_ID(Origin));
 282                                 ok = IRC_WriteErrClient(Origin,
 283                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 284                                                         Client_ID(Origin),
 285                                                         set ? '+' : '-',
 286                                                         *mode_ptr);
 287                                 x[0] = '\0';
 288                         } else {
 289                                 Log(LOG_DEBUG,
 290                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 291                                     set ? '+' : '-', *mode_ptr,
 292                                     Client_ID(Origin), Client_ID(Target));
 293                                 x[0] = *mode_ptr;
 294                         }
 295                 }
 296
 297                 if (!ok)
 298                         break;
 299
 300                 /* Is there a valid mode change? */
 301                 if (!x[0])
 302                         continue;
 303
 304                 if (set) {
 305                         if (Client_ModeAdd(Target, x[0]))
 306                                 strlcat(the_modes, x, sizeof(the_modes));
 307                 } else {
 308                         if (Client_ModeDel(Target, x[0]))
 309                                 strlcat(the_modes, x, sizeof(the_modes));
 310                 }
 311         }
 312
 313         /* Are there changed modes? */
 314         if (the_modes[1]) {
 315                 /* Remove needless action modifier characters */
 316                 len = strlen(the_modes) - 1;
 317                 if (the_modes[len] == '+' || the_modes[len] == '-')
 318                         the_modes[len] = '\0';
 319
 320                 if (Client_Type(Client) == CLIENT_SERVER) {
 321                         /* Forward modes to other servers */
 322                         if (Client_Conn(Target) != NONE) {
 323                                 /* Remote server (service?) changed modes
 324                                  * for one of our clients. Inform it! */
 325                                 IRC_WriteStrClientPrefix(Target, Origin,
 326                                                          "MODE %s :%s",
 327                                                          Client_ID(Target),
 328                                                          the_modes);
 329                         }
 330                         IRC_WriteStrServersPrefix(Client, Origin,
 331                                                   "MODE %s :%s",
 332                                                   Client_ID(Target),
 333                                                   the_modes);
 334                 } else {
 335                         /* Send reply to client and inform other servers */
 336                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 337                                                       "MODE %s :%s",
 338                                                       Client_ID(Target),
 339                                                       the_modes);
 340                         IRC_WriteStrServersPrefix(Client, Origin,
 341                                                   "MODE %s :%s",
 342                                                   Client_ID(Target),
 343                                                   the_modes);
 344                 }
 345
 346                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 347                         /* A new (cloaked) hostname must be announced */
 348                         IRC_WriteStrClientPrefix(Target, Origin,
 349                                                  RPL_HOSTHIDDEN_MSG,
 350                                                  Client_ID(Target),
 351                                                  Client_HostnameDisplayed(Target));
 352
 353                 }
 354
 355                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 356                          Client_TypeText(Target), Client_Mask(Target),
 357                          Client_Modes(Target));
 358         }
 359
 360         IRC_SetPenalty(Client, 1);
 361         return ok;
 362 } /* Client_Mode */
 363
 364 /*
 365  * Reply to a channel mode request.
 366  *
 367  * @param Origin The originator of the MODE command (prefix).
 368  * @param Channel The channel of which the modes should be sent.
 369  * @return CONNECTED or DISCONNECTED.
 370  */
 371 static bool
 372 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 373 {
 374         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 375         const char *mode_ptr;
 376
 377         /* Member or not? -- That's the question! */
 378         if (!Channel_IsMemberOf(Channel, Origin))
 379                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 380                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 381
 382         /* The sender is a member: generate extended reply */
 383         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 384         mode_ptr = the_modes;
 385         the_args[0] = '\0';
 386
 387         while(*mode_ptr) {
 388                 switch(*mode_ptr) {
 389                 case 'l':
 390                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 391                         strlcat(the_args, argadd, sizeof(the_args));
 392                         break;
 393                 case 'k':
 394                         strlcat(the_args, " ", sizeof(the_args));
 395                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 396                         break;
 397                 }
 398                 mode_ptr++;
 399         }
 400         if (the_args[0])
 401                 strlcat(the_modes, the_args, sizeof(the_modes));
 402
 403         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 404                                 Client_ID(Origin), Channel_Name(Channel),
 405                                 the_modes))
 406                 return DISCONNECTED;
 407 #ifndef STRICT_RFC
 408         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 409                                   Client_ID(Origin), Channel_Name(Channel),
 410                                   Channel_CreationTime(Channel)))
 411                 return DISCONNECTED;
 412 #endif
 413         return CONNECTED;
 414 }
 415
 416 /**
 417  * Handle channel mode and channel-user mode changes
 418  *
 419  * @param Client The client from which this command has been received.
 420  * @param Req Request structure with prefix and all parameters.
 421  * @param Origin The originator of the MODE command (prefix).
 422  * @param Channel The target channel of this MODE command.
 423  * @return CONNECTED or DISCONNECTED.
 424  */
 425 static bool
 426 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 427 {
 428         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 429             argadd[CLIENT_PASS_LEN], *mode_ptr;
 430         bool connected, set, skiponce, retval, use_servermode,
 431              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 432         int mode_arg, arg_arg, mode_arg_count = 0;
 433         CLIENT *client;
 434         long l;
 435         size_t len;
 436
 437         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 438
 439         if (Channel_IsModeless(Channel))
 440                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 441                                 Client_ID(Client), Channel_Name(Channel));
 442
 443         /* Mode request: let's answer it :-) */
 444         if (Req->argc <= 1)
 445                 return Channel_Mode_Answer_Request(Origin, Channel);
 446
 447         /* Check if origin is oper and opers can use mode */
 448         use_servermode = Conf_OperServerMode;
 449         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 450                 is_oper = true;
 451         }
 452
 453         /* Check if client is a server/service */
 454         if(Client_Type(Client) == CLIENT_SERVER ||
 455            Client_Type(Client) == CLIENT_SERVICE) {
 456                 is_machine = true;
 457         }
 458
 459         /* Check if client is member of channel or an oper or an server/service */
 460         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 461                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 462                                           Client_ID(Origin),
 463                                           Channel_Name(Channel));
 464
 465         mode_arg = 1;
 466         mode_ptr = Req->argv[mode_arg];
 467         if (Req->argc > mode_arg + 1)
 468                 arg_arg = mode_arg + 1;
 469         else
 470                 arg_arg = -1;
 471
 472         /* Initial state: set or unset modes? */
 473         skiponce = false;
 474         switch (*mode_ptr) {
 475         case '-':
 476                 set = false;
 477                 break;
 478         case '+':
 479                 set = true;
 480                 break;
 481         default:
 482                 set = true;
 483                 skiponce = true;
 484         }
 485
 486         /* Prepare reply string */
 487         strcpy(the_modes, set ? "+" : "-");
 488         the_args[0] = '\0';
 489
 490         x[1] = '\0';
 491         connected = CONNECTED;
 492         while (mode_ptr) {
 493                 if (!skiponce)
 494                         mode_ptr++;
 495                 if (!*mode_ptr) {
 496                         /* Try next argument if there's any */
 497                         if (arg_arg < 0)
 498                                 break;
 499                         if (arg_arg > mode_arg)
 500                                 mode_arg = arg_arg;
 501                         else
 502                                 mode_arg++;
 503
 504                         if (mode_arg >= Req->argc)
 505                                 break;
 506                         mode_ptr = Req->argv[mode_arg];
 507
 508                         if (Req->argc > mode_arg + 1)
 509                                 arg_arg = mode_arg + 1;
 510                         else
 511                                 arg_arg = -1;
 512                 }
 513                 skiponce = false;
 514
 515                 switch (*mode_ptr) {
 516                 case '+':
 517                 case '-':
 518                         if (((*mode_ptr == '+') && !set)
 519                             || ((*mode_ptr == '-') && set)) {
 520                                 /* Action modifier ("+"/"-") must be changed ... */
 521                                 len = strlen(the_modes) - 1;
 522                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 523                                         /* Adjust last action modifier in result */
 524                                         the_modes[len] = *mode_ptr;
 525                                 } else {
 526                                         /* Append modifier character to result string */
 527                                         x[0] = *mode_ptr;
 528                                         strlcat(the_modes, x, sizeof(the_modes));
 529                                 }
 530                                 set = *mode_ptr == '+';
 531                         }
 532                         continue;
 533                 }
 534
 535                 /* Are there arguments left? */
 536                 if (arg_arg >= Req->argc)
 537                         arg_arg = -1;
 538
 539                 if(!is_machine && !is_oper) {
 540                         if (Channel_UserHasMode(Channel, Client, 'q'))
 541                                 is_owner = true;
 542                         if (Channel_UserHasMode(Channel, Client, 'a'))
 543                                 is_admin = true;
 544                         if (Channel_UserHasMode(Channel, Client, 'o'))
 545                                 is_op = true;
 546                         if (Channel_UserHasMode(Channel, Client, 'h'))
 547                                 is_halfop = true;
 548                 }
 549
 550                 /* Validate modes */
 551                 x[0] = '\0';
 552                 argadd[0] = '\0';
 553                 client = NULL;
 554                 switch (*mode_ptr) {
 555                 /* --- Channel modes --- */
 556                 case 'R': /* Registered users only */
 557                 case 's': /* Secret channel */
 558                 case 'z': /* Secure connections only */
 559                         if(!is_oper && !is_machine && !is_owner &&
 560                            !is_admin && !is_op) {
 561                                 connected = IRC_WriteErrClient(Origin,
 562                                         ERR_CHANOPRIVSNEEDED_MSG,
 563                                         Client_ID(Origin), Channel_Name(Channel));
 564                                 goto chan_exit;
 565                         }
 566                 case 'i': /* Invite only */
 567                 case 'V': /* Invite disallow */
 568                 case 'M': /* Only identified nicks can write */
 569                 case 'm': /* Moderated */
 570                 case 'n': /* Only members can write */
 571                 case 'Q': /* No kicks */
 572                 case 't': /* Topic locked */
 573                         if(is_oper || is_machine || is_owner ||
 574                            is_admin || is_op || is_halfop)
 575                                 x[0] = *mode_ptr;
 576                         else
 577                                 connected = IRC_WriteErrClient(Origin,
 578                                         ERR_CHANOPRIVSNEEDED_MSG,
 579                                         Client_ID(Origin), Channel_Name(Channel));
 580                         break;
 581                 case 'k': /* Channel key */
 582                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 583                                 goto chan_exit;
 584                         if (!set) {
 585                                 if (is_oper || is_machine || is_owner ||
 586                                     is_admin || is_op || is_halfop)
 587                                         x[0] = *mode_ptr;
 588                                 else
 589                                         connected = IRC_WriteErrClient(Origin,
 590                                                 ERR_CHANOPRIVSNEEDED_MSG,
 591                                                 Client_ID(Origin),
 592                                                 Channel_Name(Channel));
 593                                 break;
 594                         }
 595                         if (arg_arg > mode_arg) {
 596                                 if (is_oper || is_machine || is_owner ||
 597                                     is_admin || is_op || is_halfop) {
 598                                         Channel_ModeDel(Channel, 'k');
 599                                         Channel_SetKey(Channel,
 600                                                        Req->argv[arg_arg]);
 601                                         strlcpy(argadd, Channel_Key(Channel),
 602                                                 sizeof(argadd));
 603                                         x[0] = *mode_ptr;
 604                                 } else {
 605                                         connected = IRC_WriteErrClient(Origin,
 606                                                 ERR_CHANOPRIVSNEEDED_MSG,
 607                                                 Client_ID(Origin),
 608                                                 Channel_Name(Channel));
 609                                 }
 610                                 Req->argv[arg_arg][0] = '\0';
 611                                 arg_arg++;
 612                         } else {
 613 #ifdef STRICT_RFC
 614                                 /* Only send error message in "strict" mode,
 615                                  * this is how ircd2.11 and others behave ... */
 616                                 connected = IRC_WriteErrClient(Origin,
 617                                         ERR_NEEDMOREPARAMS_MSG,
 618                                         Client_ID(Origin), Req->command);
 619 #endif
 620                                 goto chan_exit;
 621                         }
 622                         break;
 623                 case 'l': /* Member limit */
 624                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 625                                 goto chan_exit;
 626                         if (!set) {
 627                                 if (is_oper || is_machine || is_owner ||
 628                                     is_admin || is_op || is_halfop)
 629                                         x[0] = *mode_ptr;
 630                                 else
 631                                         connected = IRC_WriteErrClient(Origin,
 632                                                 ERR_CHANOPRIVSNEEDED_MSG,
 633                                                 Client_ID(Origin),
 634                                                 Channel_Name(Channel));
 635                                 break;
 636                         }
 637                         if (arg_arg > mode_arg) {
 638                                 if (is_oper || is_machine || is_owner ||
 639                                     is_admin || is_op || is_halfop) {
 640                                         l = atol(Req->argv[arg_arg]);
 641                                         if (l > 0 && l < 0xFFFF) {
 642                                                 Channel_ModeDel(Channel, 'l');
 643                                                 Channel_SetMaxUsers(Channel, l);
 644                                                 snprintf(argadd, sizeof(argadd),
 645                                                          "%ld", l);
 646                                                 x[0] = *mode_ptr;
 647                                         }
 648                                 } else {
 649                                         connected = IRC_WriteErrClient(Origin,
 650                                                 ERR_CHANOPRIVSNEEDED_MSG,
 651                                                 Client_ID(Origin),
 652                                                 Channel_Name(Channel));
 653                                 }
 654                                 Req->argv[arg_arg][0] = '\0';
 655                                 arg_arg++;
 656                         } else {
 657 #ifdef STRICT_RFC
 658                                 /* Only send error message in "strict" mode,
 659                                  * this is how ircd2.11 and others behave ... */
 660                                 connected = IRC_WriteErrClient(Origin,
 661                                         ERR_NEEDMOREPARAMS_MSG,
 662                                         Client_ID(Origin), Req->command);
 663 #endif
 664                                 goto chan_exit;
 665                         }
 666                         break;
 667                 case 'O': /* IRC operators only */
 668                         if (set) {
 669                                 /* Only IRC operators are allowed to
 670                                  * set the 'O' channel mode! */
 671                                 if(is_oper || is_machine)
 672                                         x[0] = 'O';
 673                                 else
 674                                         connected = IRC_WriteErrClient(Origin,
 675                                                 ERR_NOPRIVILEGES_MSG,
 676                                                 Client_ID(Origin));
 677                         } else if(is_oper || is_machine || is_owner ||
 678                                   is_admin || is_op)
 679                                 x[0] = 'O';
 680                         else
 681                                 connected = IRC_WriteErrClient(Origin,
 682                                         ERR_CHANOPRIVSNEEDED_MSG,
 683                                         Client_ID(Origin),
 684                                         Channel_Name(Channel));
 685                         break;
 686                 case 'P': /* Persistent channel */
 687                         if (set) {
 688                                 /* Only IRC operators are allowed to
 689                                  * set the 'P' channel mode! */
 690                                 if(is_oper || is_machine)
 691                                         x[0] = 'P';
 692                                 else
 693                                         connected = IRC_WriteErrClient(Origin,
 694                                                 ERR_NOPRIVILEGES_MSG,
 695                                                 Client_ID(Origin));
 696                         } else if(is_oper || is_machine || is_owner ||
 697                                   is_admin || is_op)
 698                                 x[0] = 'P';
 699                         else
 700                                 connected = IRC_WriteErrClient(Origin,
 701                                         ERR_CHANOPRIVSNEEDED_MSG,
 702                                         Client_ID(Origin),
 703                                         Channel_Name(Channel));
 704                         break;
 705                 /* --- Channel user modes --- */
 706                 case 'q': /* Owner */
 707                 case 'a': /* Channel admin */
 708                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 709                                 connected = IRC_WriteErrClient(Origin,
 710                                         ERR_CHANOPPRIVTOOLOW_MSG,
 711                                         Client_ID(Origin),
 712                                         Channel_Name(Channel));
 713                                 goto chan_exit;
 714                         }
 715                 case 'o': /* Channel operator */
 716                         if(!is_oper && !is_machine && !is_owner &&
 717                            !is_admin && !is_op) {
 718                                 connected = IRC_WriteErrClient(Origin,
 719                                         ERR_CHANOPRIVSNEEDED_MSG,
 720                                         Client_ID(Origin),
 721                                         Channel_Name(Channel));
 722                                 goto chan_exit;
 723                         }
 724                 case 'h': /* Half Op */
 725                         if(!is_oper && !is_machine && !is_owner &&
 726                            !is_admin && !is_op) {
 727                                 connected = IRC_WriteErrClient(Origin,
 728                                         ERR_CHANOPRIVSNEEDED_MSG,
 729                                         Client_ID(Origin),
 730                                         Channel_Name(Channel));
 731                                 goto chan_exit;
 732                         }
 733                 case 'v': /* Voice */
 734                         if (arg_arg > mode_arg) {
 735                                 if (is_oper || is_machine || is_owner ||
 736                                     is_admin || is_op || is_halfop) {
 737                                         client = Client_Search(Req->argv[arg_arg]);
 738                                         if (client)
 739                                                 x[0] = *mode_ptr;
 740                                         else
 741                                                 connected = IRC_WriteErrClient(Origin,
 742                                                         ERR_NOSUCHNICK_MSG,
 743                                                         Client_ID(Origin),
 744                                                         Req->argv[arg_arg]);
 745                                 } else {
 746                                         connected = IRC_WriteErrClient(Origin,
 747                                                 ERR_CHANOPRIVSNEEDED_MSG,
 748                                                 Client_ID(Origin),
 749                                                 Channel_Name(Channel));
 750                                 }
 751                                 Req->argv[arg_arg][0] = '\0';
 752                                 arg_arg++;
 753                         } else {
 754 #ifdef STRICT_RFC
 755                                 /* Report an error to the client, when a user
 756                                  * mode should be changed but no nickname is
 757                                  * given. But don't do it when not in "strict"
 758                                  * mode, because most other servers don't do
 759                                  * it as well and some clients send "wired"
 760                                  * MODE commands like "MODE #chan -ooo nick". */
 761                                 connected = IRC_WriteErrClient(Origin,
 762                                         ERR_NEEDMOREPARAMS_MSG,
 763                                         Client_ID(Origin), Req->command);
 764 #endif
 765                                 goto chan_exit;
 766                         }
 767                         break;
 768                 /* --- Channel lists --- */
 769                 case 'I': /* Invite lists */
 770                 case 'b': /* Ban lists */
 771                 case 'e': /* Channel exception lists */
 772                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 773                                 goto chan_exit;
 774                         if (arg_arg > mode_arg) {
 775                                 /* modify list */
 776                                 if (is_oper || is_machine || is_owner ||
 777                                     is_admin || is_op || is_halfop) {
 778                                         connected = set
 779                                            ? Add_To_List(*mode_ptr, Origin,
 780                                                 Client, Channel,
 781                                                 Req->argv[arg_arg])
 782                                            : Del_From_List(*mode_ptr, Origin,
 783                                                 Client, Channel,
 784                                                 Req->argv[arg_arg]);
 785                                 } else {
 786                                         connected = IRC_WriteErrClient(Origin,
 787                                                 ERR_CHANOPRIVSNEEDED_MSG,
 788                                                 Client_ID(Origin),
 789                                                 Channel_Name(Channel));
 790                                 }
 791                                 Req->argv[arg_arg][0] = '\0';
 792                                 arg_arg++;
 793                         } else {
 794                                 switch (*mode_ptr) {
 795                                 case 'I':
 796                                         Channel_ShowInvites(Origin, Channel);
 797                                         break;
 798                                 case 'b':
 799                                         Channel_ShowBans(Origin, Channel);
 800                                         break;
 801                                 case 'e':
 802                                         Channel_ShowExcepts(Origin, Channel);
 803                                         break;
 804                                 }
 805                         }
 806                         break;
 807                 default:
 808                         if (Client_Type(Client) != CLIENT_SERVER) {
 809                                 Log(LOG_DEBUG,
 810                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 811                                     set ? '+' : '-', *mode_ptr,
 812                                     Client_ID(Origin), Channel_Name(Channel));
 813                                 connected = IRC_WriteErrClient(Origin,
 814                                         ERR_UNKNOWNMODE_MSG,
 815                                         Client_ID(Origin), *mode_ptr,
 816                                         Channel_Name(Channel));
 817                                 x[0] = '\0';
 818                         } else {
 819                                 Log(LOG_DEBUG,
 820                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 821                                     set ? '+' : '-', *mode_ptr,
 822                                     Client_ID(Origin), Channel_Name(Channel));
 823                                 x[0] = *mode_ptr;
 824                         }
 825                 }
 826
 827                 if (!connected)
 828                         break;
 829
 830                 /* Is there a valid mode change? */
 831                 if (!x[0])
 832                         continue;
 833
 834                 /* Validate target client */
 835                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 836                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 837                                                 Client_ID(Origin),
 838                                                 Client_ID(client),
 839                                                 Channel_Name(Channel)))
 840                                 break;
 841                         continue;
 842                 }
 843
 844                 if (client) {
 845                         /* Channel-User-Mode */
 846                         retval = set
 847                                ? Channel_UserModeAdd(Channel, client, x[0])
 848                                : Channel_UserModeDel(Channel, client, x[0]);
 849                         if (retval) {
 850                                 strlcat(the_args, " ", sizeof(the_args));
 851                                 strlcat(the_args, Client_ID(client),
 852                                         sizeof(the_args));
 853                                 strlcat(the_modes, x, sizeof(the_modes));
 854                                 LogDebug
 855                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 856                                      Client_Mask(client), Channel_Name(Channel),
 857                                      Channel_UserModes(Channel, client));
 858                         }
 859                 } else {
 860                         /* Channel-Mode */
 861                         retval = set
 862                                ? Channel_ModeAdd(Channel, x[0])
 863                                : Channel_ModeDel(Channel, x[0]);
 864                         if (retval) {
 865                                 strlcat(the_modes, x, sizeof(the_modes));
 866                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 867                                          Channel_Name(Channel),
 868                                          Channel_Modes(Channel));
 869                         }
 870                 }
 871
 872                 /* Are there additional arguments to add? */
 873                 if (argadd[0]) {
 874                         strlcat(the_args, " ", sizeof(the_args));
 875                         strlcat(the_args, argadd, sizeof(the_args));
 876                 }
 877         }
 878
 879       chan_exit:
 880         /* Are there changed modes? */
 881         if (the_modes[1]) {
 882                 /* Clean up mode string */
 883                 len = strlen(the_modes) - 1;
 884                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 885                         the_modes[len] = '\0';
 886
 887                 if (Client_Type(Client) == CLIENT_SERVER) {
 888                         /* MODE requests for local channels from other servers
 889                          * are definitely invalid! */
 890                         if (Channel_IsLocal(Channel)) {
 891                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 892                                 return CONNECTED;
 893                         }
 894
 895                         /* Forward mode changes to channel users and all the
 896                          * other remote servers: */
 897                         IRC_WriteStrServersPrefix(Client, Origin,
 898                                 "MODE %s %s%s", Channel_Name(Channel),
 899                                 the_modes, the_args);
 900                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 901                                 false, "MODE %s %s%s", Channel_Name(Channel),
 902                                 the_modes, the_args);
 903                 } else {
 904                         if (use_servermode)
 905                                 Origin = Client_ThisServer();
 906                         /* Send reply to client and inform other servers and channel users */
 907                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 908                                         "MODE %s %s%s", Channel_Name(Channel),
 909                                         the_modes, the_args);
 910                         /* Only forward requests for non-local channels */
 911                         if (!Channel_IsLocal(Channel))
 912                                 IRC_WriteStrServersPrefix(Client, Origin,
 913                                         "MODE %s %s%s", Channel_Name(Channel),
 914                                         the_modes, the_args);
 915                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 916                                 false, "MODE %s %s%s", Channel_Name(Channel),
 917                                 the_modes, the_args);
 918                 }
 919         }
 920
 921         IRC_SetPenalty(Client, 1);
 922         return connected;
 923 } /* Channel_Mode */
 924
 925 /**
 926  * Handler for the IRC "AWAY" command.
 927  *
 928  * @param Client The client from which this command has been received.
 929  * @param Req Request structure with prefix and all parameters.
 930  * @return CONNECTED or DISCONNECTED.
 931  */
 932 GLOBAL bool
 933 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 934 {
 935         assert (Client != NULL);
 936         assert (Req != NULL);
 937
 938         if (Req->argc == 1 && Req->argv[0][0]) {
 939                 Client_SetAway(Client, Req->argv[0]);
 940                 Client_ModeAdd(Client, 'a');
 941                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 942                                           Client_ID( Client));
 943                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 944                                           Client_ID( Client));
 945         } else {
 946                 Client_ModeDel(Client, 'a');
 947                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 948                                           Client_ID( Client));
 949                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 950                                           Client_ID( Client));
 951         }
 952 } /* IRC_AWAY */
 953
 954 /**
 955  * Add entries to channel invite, ban and exception lists.
 956  *
 957  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 958  * @param Prefix The originator of the command.
 959  * @param Client The sender of the command.
 960  * @param Channel The channel of which the list should be modified.
 961  * @param Pattern The pattern to add to the list.
 962  * @return CONNECTED or DISCONNECTED.
 963  */
 964 static bool
 965 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 966             const char *Pattern)
 967 {
 968         char mask[MASK_LEN];
 969         struct list_head *list = NULL;
 970         long int current_count;
 971
 972         assert(Client != NULL);
 973         assert(Channel != NULL);
 974         assert(Pattern != NULL);
 975         assert(what == 'I' || what == 'b' || what == 'e');
 976
 977         Lists_MakeMask(Pattern, mask, sizeof(mask));
 978         current_count = Lists_Count(Channel_GetListInvites(Channel))
 979                         + Lists_Count(Channel_GetListExcepts(Channel))
 980                         + Lists_Count(Channel_GetListBans(Channel));
 981
 982         switch(what) {
 983                 case 'I':
 984                         list = Channel_GetListInvites(Channel);
 985                         break;
 986                 case 'b':
 987                         list = Channel_GetListBans(Channel);
 988                         break;
 989                 case 'e':
 990                         list = Channel_GetListExcepts(Channel);
 991                         break;
 992         }
 993
 994         if (Lists_CheckDupeMask(list, mask))
 995                 return CONNECTED;
 996         if (Client_Type(Client) == CLIENT_USER &&
 997             current_count >= MAX_HNDL_CHANNEL_LISTS)
 998                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
 999                                           Client_ID(Client),
1000                                           Channel_Name(Channel), mask,
1001                                           MAX_HNDL_CHANNEL_LISTS);
1002
1003         switch (what) {
1004                 case 'I':
1005                         if (!Channel_AddInvite(Channel, mask, false))
1006                                 return CONNECTED;
1007                         break;
1008                 case 'b':
1009                         if (!Channel_AddBan(Channel, mask))
1010                                 return CONNECTED;
1011                         break;
1012                 case 'e':
1013                         if (!Channel_AddExcept(Channel, mask))
1014                                 return CONNECTED;
1015                         break;
1016         }
1017         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1018 }
1019
1020 /**
1021  * Delete entries from channel invite, ban and exception lists.
1022  *
1023  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1024  * @param Prefix The originator of the command.
1025  * @param Client The sender of the command.
1026  * @param Channel The channel of which the list should be modified.
1027  * @param Pattern The pattern to add to the list.
1028  * @return CONNECTED or DISCONNECTED.
1029  */
1030 static bool
1031 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1032               const char *Pattern)
1033 {
1034         char mask[MASK_LEN];
1035         struct list_head *list = NULL;
1036
1037         assert(Client != NULL);
1038         assert(Channel != NULL);
1039         assert(Pattern != NULL);
1040         assert(what == 'I' || what == 'b' || what == 'e');
1041
1042         Lists_MakeMask(Pattern, mask, sizeof(mask));
1043
1044         switch (what) {
1045                 case 'I':
1046                         list = Channel_GetListInvites(Channel);
1047                         break;
1048                 case 'b':
1049                         list = Channel_GetListBans(Channel);
1050                         break;
1051                 case 'e':
1052                         list = Channel_GetListExcepts(Channel);
1053                         break;
1054         }
1055
1056         if (!Lists_CheckDupeMask(list, mask))
1057                 return CONNECTED;
1058         Lists_Del(list, mask);
1059
1060         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1061 }
1062
1063 /**
1064  * Send information about changed channel invite/ban/exception lists to clients.
1065  *
1066  * @param IsAdd true if the list item has been added, false otherwise.
1067  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1068  * @param Prefix The originator of the mode list change.
1069  * @param Client The sender of the command.
1070  * @param Channel The channel of which the list has been modified.
1071  * @param Mask The mask which has been added or removed.
1072  * @return CONNECTED or DISCONNECTED.
1073  */
1074 static bool
1075 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1076                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1077 {
1078         bool ok = true;
1079
1080         /* Send confirmation to the client */
1081         if (Client_Type(Client) == CLIENT_USER)
1082                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1083                                               Channel_Name(Channel),
1084                                               IsAdd ? '+' : '-',
1085                                               ModeChar, Mask);
1086
1087         /* to other servers */
1088         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1089                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1090                                   ModeChar, Mask);
1091
1092         /* and local users in channel */
1093         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1094                                   "MODE %s %c%c %s", Channel_Name(Channel),
1095                                   IsAdd ? '+' : '-', ModeChar, Mask );
1096
1097         return ok;
1098 } /* Send_ListChange */
1099
1100 /* -eof- */