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