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         return ok;
 361 } /* Client_Mode */
 362
 363 /*
 364  * Reply to a channel mode request.
 365  *
 366  * @param Origin The originator of the MODE command (prefix).
 367  * @param Channel The channel of which the modes should be sent.
 368  * @return CONNECTED or DISCONNECTED.
 369  */
 370 static bool
 371 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 372 {
 373         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 374         const char *mode_ptr;
 375
 376         /* Member or not? -- That's the question! */
 377         if (!Channel_IsMemberOf(Channel, Origin))
 378                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 379                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 380
 381         /* The sender is a member: generate extended reply */
 382         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 383         mode_ptr = the_modes;
 384         the_args[0] = '\0';
 385
 386         while(*mode_ptr) {
 387                 switch(*mode_ptr) {
 388                 case 'l':
 389                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 390                         strlcat(the_args, argadd, sizeof(the_args));
 391                         break;
 392                 case 'k':
 393                         strlcat(the_args, " ", sizeof(the_args));
 394                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 395                         break;
 396                 }
 397                 mode_ptr++;
 398         }
 399         if (the_args[0])
 400                 strlcat(the_modes, the_args, sizeof(the_modes));
 401
 402         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 403                                 Client_ID(Origin), Channel_Name(Channel),
 404                                 the_modes))
 405                 return DISCONNECTED;
 406 #ifndef STRICT_RFC
 407         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 408                                   Client_ID(Origin), Channel_Name(Channel),
 409                                   Channel_CreationTime(Channel)))
 410                 return DISCONNECTED;
 411 #endif
 412         return CONNECTED;
 413 }
 414
 415 /**
 416  * Handle channel mode and channel-user mode changes
 417  *
 418  * @param Client The client from which this command has been received.
 419  * @param Req Request structure with prefix and all parameters.
 420  * @param Origin The originator of the MODE command (prefix).
 421  * @param Channel The target channel of this MODE command.
 422  * @return CONNECTED or DISCONNECTED.
 423  */
 424 static bool
 425 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 426 {
 427         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 428             argadd[CLIENT_PASS_LEN], *mode_ptr;
 429         bool connected, set, skiponce, retval, use_servermode,
 430              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 431         int mode_arg, arg_arg, mode_arg_count = 0;
 432         CLIENT *client;
 433         long l;
 434         size_t len;
 435
 436         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 437
 438         if (Channel_IsModeless(Channel))
 439                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 440                                 Client_ID(Client), Channel_Name(Channel));
 441
 442         /* Mode request: let's answer it :-) */
 443         if (Req->argc <= 1)
 444                 return Channel_Mode_Answer_Request(Origin, Channel);
 445
 446         /* Check if origin is oper and opers can use mode */
 447         use_servermode = Conf_OperServerMode;
 448         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 449                 is_oper = true;
 450         }
 451
 452         /* Check if client is a server/service */
 453         if(Client_Type(Client) == CLIENT_SERVER ||
 454            Client_Type(Client) == CLIENT_SERVICE) {
 455                 is_machine = true;
 456         }
 457
 458         /* Check if client is member of channel or an oper or an server/service */
 459         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 460                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 461                                           Client_ID(Origin),
 462                                           Channel_Name(Channel));
 463
 464         mode_arg = 1;
 465         mode_ptr = Req->argv[mode_arg];
 466         if (Req->argc > mode_arg + 1)
 467                 arg_arg = mode_arg + 1;
 468         else
 469                 arg_arg = -1;
 470
 471         /* Initial state: set or unset modes? */
 472         skiponce = false;
 473         switch (*mode_ptr) {
 474         case '-':
 475                 set = false;
 476                 break;
 477         case '+':
 478                 set = true;
 479                 break;
 480         default:
 481                 set = true;
 482                 skiponce = true;
 483         }
 484
 485         /* Prepare reply string */
 486         strcpy(the_modes, set ? "+" : "-");
 487         the_args[0] = '\0';
 488
 489         x[1] = '\0';
 490         connected = CONNECTED;
 491         while (mode_ptr) {
 492                 if (!skiponce)
 493                         mode_ptr++;
 494                 if (!*mode_ptr) {
 495                         /* Try next argument if there's any */
 496                         if (arg_arg < 0)
 497                                 break;
 498                         if (arg_arg > mode_arg)
 499                                 mode_arg = arg_arg;
 500                         else
 501                                 mode_arg++;
 502
 503                         if (mode_arg >= Req->argc)
 504                                 break;
 505                         mode_ptr = Req->argv[mode_arg];
 506
 507                         if (Req->argc > mode_arg + 1)
 508                                 arg_arg = mode_arg + 1;
 509                         else
 510                                 arg_arg = -1;
 511                 }
 512                 skiponce = false;
 513
 514                 switch (*mode_ptr) {
 515                 case '+':
 516                 case '-':
 517                         if (((*mode_ptr == '+') && !set)
 518                             || ((*mode_ptr == '-') && set)) {
 519                                 /* Action modifier ("+"/"-") must be changed ... */
 520                                 len = strlen(the_modes) - 1;
 521                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 522                                         /* Adjust last action modifier in result */
 523                                         the_modes[len] = *mode_ptr;
 524                                 } else {
 525                                         /* Append modifier character to result string */
 526                                         x[0] = *mode_ptr;
 527                                         strlcat(the_modes, x, sizeof(the_modes));
 528                                 }
 529                                 set = *mode_ptr == '+';
 530                         }
 531                         continue;
 532                 }
 533
 534                 /* Are there arguments left? */
 535                 if (arg_arg >= Req->argc)
 536                         arg_arg = -1;
 537
 538                 if(!is_machine && !is_oper) {
 539                         if (Channel_UserHasMode(Channel, Client, 'q'))
 540                                 is_owner = true;
 541                         if (Channel_UserHasMode(Channel, Client, 'a'))
 542                                 is_admin = true;
 543                         if (Channel_UserHasMode(Channel, Client, 'o'))
 544                                 is_op = true;
 545                         if (Channel_UserHasMode(Channel, Client, 'h'))
 546                                 is_halfop = true;
 547                 }
 548
 549                 /* Validate modes */
 550                 x[0] = '\0';
 551                 argadd[0] = '\0';
 552                 client = NULL;
 553                 switch (*mode_ptr) {
 554                 /* --- Channel modes --- */
 555                 case 'R': /* Registered users only */
 556                 case 's': /* Secret channel */
 557                 case 'z': /* Secure connections only */
 558                         if(!is_oper && !is_machine && !is_owner &&
 559                            !is_admin && !is_op) {
 560                                 connected = IRC_WriteErrClient(Origin,
 561                                         ERR_CHANOPRIVSNEEDED_MSG,
 562                                         Client_ID(Origin), Channel_Name(Channel));
 563                                 goto chan_exit;
 564                         }
 565                 case 'i': /* Invite only */
 566                 case 'V': /* Invite disallow */
 567                 case 'M': /* Only identified nicks can write */
 568                 case 'm': /* Moderated */
 569                 case 'n': /* Only members can write */
 570                 case 'Q': /* No kicks */
 571                 case 't': /* Topic locked */
 572                         if(is_oper || is_machine || is_owner ||
 573                            is_admin || is_op || is_halfop)
 574                                 x[0] = *mode_ptr;
 575                         else
 576                                 connected = IRC_WriteErrClient(Origin,
 577                                         ERR_CHANOPRIVSNEEDED_MSG,
 578                                         Client_ID(Origin), Channel_Name(Channel));
 579                         break;
 580                 case 'k': /* Channel key */
 581                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 582                                 goto chan_exit;
 583                         if (!set) {
 584                                 if (is_oper || is_machine || is_owner ||
 585                                     is_admin || is_op || is_halfop)
 586                                         x[0] = *mode_ptr;
 587                                 else
 588                                         connected = IRC_WriteErrClient(Origin,
 589                                                 ERR_CHANOPRIVSNEEDED_MSG,
 590                                                 Client_ID(Origin),
 591                                                 Channel_Name(Channel));
 592                                 break;
 593                         }
 594                         if (arg_arg > mode_arg) {
 595                                 if (is_oper || is_machine || is_owner ||
 596                                     is_admin || is_op || is_halfop) {
 597                                         Channel_ModeDel(Channel, 'k');
 598                                         Channel_SetKey(Channel,
 599                                                        Req->argv[arg_arg]);
 600                                         strlcpy(argadd, Channel_Key(Channel),
 601                                                 sizeof(argadd));
 602                                         x[0] = *mode_ptr;
 603                                 } else {
 604                                         connected = IRC_WriteErrClient(Origin,
 605                                                 ERR_CHANOPRIVSNEEDED_MSG,
 606                                                 Client_ID(Origin),
 607                                                 Channel_Name(Channel));
 608                                 }
 609                                 Req->argv[arg_arg][0] = '\0';
 610                                 arg_arg++;
 611                         } else {
 612 #ifdef STRICT_RFC
 613                                 /* Only send error message in "strict" mode,
 614                                  * this is how ircd2.11 and others behave ... */
 615                                 connected = IRC_WriteErrClient(Origin,
 616                                         ERR_NEEDMOREPARAMS_MSG,
 617                                         Client_ID(Origin), Req->command);
 618 #endif
 619                                 goto chan_exit;
 620                         }
 621                         break;
 622                 case 'l': /* Member limit */
 623                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 624                                 goto chan_exit;
 625                         if (!set) {
 626                                 if (is_oper || is_machine || is_owner ||
 627                                     is_admin || is_op || is_halfop)
 628                                         x[0] = *mode_ptr;
 629                                 else
 630                                         connected = IRC_WriteErrClient(Origin,
 631                                                 ERR_CHANOPRIVSNEEDED_MSG,
 632                                                 Client_ID(Origin),
 633                                                 Channel_Name(Channel));
 634                                 break;
 635                         }
 636                         if (arg_arg > mode_arg) {
 637                                 if (is_oper || is_machine || is_owner ||
 638                                     is_admin || is_op || is_halfop) {
 639                                         l = atol(Req->argv[arg_arg]);
 640                                         if (l > 0 && l < 0xFFFF) {
 641                                                 Channel_ModeDel(Channel, 'l');
 642                                                 Channel_SetMaxUsers(Channel, l);
 643                                                 snprintf(argadd, sizeof(argadd),
 644                                                          "%ld", l);
 645                                                 x[0] = *mode_ptr;
 646                                         }
 647                                 } else {
 648                                         connected = IRC_WriteErrClient(Origin,
 649                                                 ERR_CHANOPRIVSNEEDED_MSG,
 650                                                 Client_ID(Origin),
 651                                                 Channel_Name(Channel));
 652                                 }
 653                                 Req->argv[arg_arg][0] = '\0';
 654                                 arg_arg++;
 655                         } else {
 656 #ifdef STRICT_RFC
 657                                 /* Only send error message in "strict" mode,
 658                                  * this is how ircd2.11 and others behave ... */
 659                                 connected = IRC_WriteErrClient(Origin,
 660                                         ERR_NEEDMOREPARAMS_MSG,
 661                                         Client_ID(Origin), Req->command);
 662 #endif
 663                                 goto chan_exit;
 664                         }
 665                         break;
 666                 case 'O': /* IRC operators only */
 667                         if (set) {
 668                                 /* Only IRC operators are allowed to
 669                                  * set the 'O' channel mode! */
 670                                 if(is_oper || is_machine)
 671                                         x[0] = 'O';
 672                                 else
 673                                         connected = IRC_WriteErrClient(Origin,
 674                                                 ERR_NOPRIVILEGES_MSG,
 675                                                 Client_ID(Origin));
 676                         } else if(is_oper || is_machine || is_owner ||
 677                                   is_admin || is_op)
 678                                 x[0] = 'O';
 679                         else
 680                                 connected = IRC_WriteErrClient(Origin,
 681                                         ERR_CHANOPRIVSNEEDED_MSG,
 682                                         Client_ID(Origin),
 683                                         Channel_Name(Channel));
 684                         break;
 685                 case 'P': /* Persistent channel */
 686                         if (set) {
 687                                 /* Only IRC operators are allowed to
 688                                  * set the 'P' channel mode! */
 689                                 if(is_oper || is_machine)
 690                                         x[0] = 'P';
 691                                 else
 692                                         connected = IRC_WriteErrClient(Origin,
 693                                                 ERR_NOPRIVILEGES_MSG,
 694                                                 Client_ID(Origin));
 695                         } else if(is_oper || is_machine || is_owner ||
 696                                   is_admin || is_op)
 697                                 x[0] = 'P';
 698                         else
 699                                 connected = IRC_WriteErrClient(Origin,
 700                                         ERR_CHANOPRIVSNEEDED_MSG,
 701                                         Client_ID(Origin),
 702                                         Channel_Name(Channel));
 703                         break;
 704                 /* --- Channel user modes --- */
 705                 case 'q': /* Owner */
 706                 case 'a': /* Channel admin */
 707                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 708                                 connected = IRC_WriteErrClient(Origin,
 709                                         ERR_CHANOPPRIVTOOLOW_MSG,
 710                                         Client_ID(Origin),
 711                                         Channel_Name(Channel));
 712                                 goto chan_exit;
 713                         }
 714                 case 'o': /* Channel operator */
 715                         if(!is_oper && !is_machine && !is_owner &&
 716                            !is_admin && !is_op) {
 717                                 connected = IRC_WriteErrClient(Origin,
 718                                         ERR_CHANOPRIVSNEEDED_MSG,
 719                                         Client_ID(Origin),
 720                                         Channel_Name(Channel));
 721                                 goto chan_exit;
 722                         }
 723                 case 'h': /* Half Op */
 724                         if(!is_oper && !is_machine && !is_owner &&
 725                            !is_admin && !is_op) {
 726                                 connected = IRC_WriteErrClient(Origin,
 727                                         ERR_CHANOPRIVSNEEDED_MSG,
 728                                         Client_ID(Origin),
 729                                         Channel_Name(Channel));
 730                                 goto chan_exit;
 731                         }
 732                 case 'v': /* Voice */
 733                         if (arg_arg > mode_arg) {
 734                                 if (is_oper || is_machine || is_owner ||
 735                                     is_admin || is_op || is_halfop) {
 736                                         client = Client_Search(Req->argv[arg_arg]);
 737                                         if (client)
 738                                                 x[0] = *mode_ptr;
 739                                         else
 740                                                 connected = IRC_WriteErrClient(Origin,
 741                                                         ERR_NOSUCHNICK_MSG,
 742                                                         Client_ID(Origin),
 743                                                         Req->argv[arg_arg]);
 744                                 } else {
 745                                         connected = IRC_WriteErrClient(Origin,
 746                                                 ERR_CHANOPRIVSNEEDED_MSG,
 747                                                 Client_ID(Origin),
 748                                                 Channel_Name(Channel));
 749                                 }
 750                                 Req->argv[arg_arg][0] = '\0';
 751                                 arg_arg++;
 752                         } else {
 753 #ifdef STRICT_RFC
 754                                 /* Report an error to the client, when a user
 755                                  * mode should be changed but no nickname is
 756                                  * given. But don't do it when not in "strict"
 757                                  * mode, because most other servers don't do
 758                                  * it as well and some clients send "wired"
 759                                  * MODE commands like "MODE #chan -ooo nick". */
 760                                 connected = IRC_WriteErrClient(Origin,
 761                                         ERR_NEEDMOREPARAMS_MSG,
 762                                         Client_ID(Origin), Req->command);
 763 #endif
 764                                 goto chan_exit;
 765                         }
 766                         break;
 767                 /* --- Channel lists --- */
 768                 case 'I': /* Invite lists */
 769                 case 'b': /* Ban lists */
 770                 case 'e': /* Channel exception lists */
 771                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 772                                 goto chan_exit;
 773                         if (arg_arg > mode_arg) {
 774                                 /* modify list */
 775                                 if (is_oper || is_machine || is_owner ||
 776                                     is_admin || is_op || is_halfop) {
 777                                         connected = set
 778                                            ? Add_To_List(*mode_ptr, Origin,
 779                                                 Client, Channel,
 780                                                 Req->argv[arg_arg])
 781                                            : Del_From_List(*mode_ptr, Origin,
 782                                                 Client, Channel,
 783                                                 Req->argv[arg_arg]);
 784                                 } else {
 785                                         connected = IRC_WriteErrClient(Origin,
 786                                                 ERR_CHANOPRIVSNEEDED_MSG,
 787                                                 Client_ID(Origin),
 788                                                 Channel_Name(Channel));
 789                                 }
 790                                 Req->argv[arg_arg][0] = '\0';
 791                                 arg_arg++;
 792                         } else {
 793                                 switch (*mode_ptr) {
 794                                 case 'I':
 795                                         Channel_ShowInvites(Origin, Channel);
 796                                         break;
 797                                 case 'b':
 798                                         Channel_ShowBans(Origin, Channel);
 799                                         break;
 800                                 case 'e':
 801                                         Channel_ShowExcepts(Origin, Channel);
 802                                         break;
 803                                 }
 804                         }
 805                         break;
 806                 default:
 807                         if (Client_Type(Client) != CLIENT_SERVER) {
 808                                 Log(LOG_DEBUG,
 809                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 810                                     set ? '+' : '-', *mode_ptr,
 811                                     Client_ID(Origin), Channel_Name(Channel));
 812                                 connected = IRC_WriteErrClient(Origin,
 813                                         ERR_UNKNOWNMODE_MSG,
 814                                         Client_ID(Origin), *mode_ptr,
 815                                         Channel_Name(Channel));
 816                                 x[0] = '\0';
 817                         } else {
 818                                 Log(LOG_DEBUG,
 819                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 820                                     set ? '+' : '-', *mode_ptr,
 821                                     Client_ID(Origin), Channel_Name(Channel));
 822                                 x[0] = *mode_ptr;
 823                         }
 824                 }
 825
 826                 if (!connected)
 827                         break;
 828
 829                 /* Is there a valid mode change? */
 830                 if (!x[0])
 831                         continue;
 832
 833                 /* Validate target client */
 834                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 835                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 836                                                 Client_ID(Origin),
 837                                                 Client_ID(client),
 838                                                 Channel_Name(Channel)))
 839                                 break;
 840                         continue;
 841                 }
 842
 843                 if (client) {
 844                         /* Channel-User-Mode */
 845                         retval = set
 846                                ? Channel_UserModeAdd(Channel, client, x[0])
 847                                : Channel_UserModeDel(Channel, client, x[0]);
 848                         if (retval) {
 849                                 strlcat(the_args, " ", sizeof(the_args));
 850                                 strlcat(the_args, Client_ID(client),
 851                                         sizeof(the_args));
 852                                 strlcat(the_modes, x, sizeof(the_modes));
 853                                 LogDebug
 854                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 855                                      Client_Mask(client), Channel_Name(Channel),
 856                                      Channel_UserModes(Channel, client));
 857                         }
 858                 } else {
 859                         /* Channel-Mode */
 860                         retval = set
 861                                ? Channel_ModeAdd(Channel, x[0])
 862                                : Channel_ModeDel(Channel, x[0]);
 863                         if (retval) {
 864                                 strlcat(the_modes, x, sizeof(the_modes));
 865                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 866                                          Channel_Name(Channel),
 867                                          Channel_Modes(Channel));
 868                         }
 869                 }
 870
 871                 /* Are there additional arguments to add? */
 872                 if (argadd[0]) {
 873                         strlcat(the_args, " ", sizeof(the_args));
 874                         strlcat(the_args, argadd, sizeof(the_args));
 875                 }
 876         }
 877
 878       chan_exit:
 879         /* Are there changed modes? */
 880         if (the_modes[1]) {
 881                 /* Clean up mode string */
 882                 len = strlen(the_modes) - 1;
 883                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 884                         the_modes[len] = '\0';
 885
 886                 if (Client_Type(Client) == CLIENT_SERVER) {
 887                         /* MODE requests for local channels from other servers
 888                          * are definitely invalid! */
 889                         if (Channel_IsLocal(Channel)) {
 890                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 891                                 return CONNECTED;
 892                         }
 893
 894                         /* Forward mode changes to channel users and all the
 895                          * other remote servers: */
 896                         IRC_WriteStrServersPrefix(Client, Origin,
 897                                 "MODE %s %s%s", Channel_Name(Channel),
 898                                 the_modes, the_args);
 899                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 900                                 false, "MODE %s %s%s", Channel_Name(Channel),
 901                                 the_modes, the_args);
 902                 } else {
 903                         if (use_servermode)
 904                                 Origin = Client_ThisServer();
 905                         /* Send reply to client and inform other servers and channel users */
 906                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 907                                         "MODE %s %s%s", Channel_Name(Channel),
 908                                         the_modes, the_args);
 909                         /* Only forward requests for non-local channels */
 910                         if (!Channel_IsLocal(Channel))
 911                                 IRC_WriteStrServersPrefix(Client, Origin,
 912                                         "MODE %s %s%s", Channel_Name(Channel),
 913                                         the_modes, the_args);
 914                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 915                                 false, "MODE %s %s%s", Channel_Name(Channel),
 916                                 the_modes, the_args);
 917                 }
 918         }
 919
 920         return connected;
 921 } /* Channel_Mode */
 922
 923 /**
 924  * Handler for the IRC "AWAY" command.
 925  *
 926  * @param Client The client from which this command has been received.
 927  * @param Req Request structure with prefix and all parameters.
 928  * @return CONNECTED or DISCONNECTED.
 929  */
 930 GLOBAL bool
 931 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 932 {
 933         assert (Client != NULL);
 934         assert (Req != NULL);
 935
 936         if (Req->argc == 1 && Req->argv[0][0]) {
 937                 Client_SetAway(Client, Req->argv[0]);
 938                 Client_ModeAdd(Client, 'a');
 939                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 940                                           Client_ID( Client));
 941                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 942                                           Client_ID( Client));
 943         } else {
 944                 Client_ModeDel(Client, 'a');
 945                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 946                                           Client_ID( Client));
 947                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 948                                           Client_ID( Client));
 949         }
 950 } /* IRC_AWAY */
 951
 952 /**
 953  * Add entries to channel invite, ban and exception lists.
 954  *
 955  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 956  * @param Prefix The originator of the command.
 957  * @param Client The sender of the command.
 958  * @param Channel The channel of which the list should be modified.
 959  * @param Pattern The pattern to add to the list.
 960  * @return CONNECTED or DISCONNECTED.
 961  */
 962 static bool
 963 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 964             const char *Pattern)
 965 {
 966         char mask[MASK_LEN];
 967         struct list_head *list = NULL;
 968         long int current_count;
 969
 970         assert(Client != NULL);
 971         assert(Channel != NULL);
 972         assert(Pattern != NULL);
 973         assert(what == 'I' || what == 'b' || what == 'e');
 974
 975         Lists_MakeMask(Pattern, mask, sizeof(mask));
 976         current_count = Lists_Count(Channel_GetListInvites(Channel))
 977                         + Lists_Count(Channel_GetListExcepts(Channel))
 978                         + Lists_Count(Channel_GetListBans(Channel));
 979
 980         switch(what) {
 981                 case 'I':
 982                         list = Channel_GetListInvites(Channel);
 983                         break;
 984                 case 'b':
 985                         list = Channel_GetListBans(Channel);
 986                         break;
 987                 case 'e':
 988                         list = Channel_GetListExcepts(Channel);
 989                         break;
 990         }
 991
 992         if (Lists_CheckDupeMask(list, mask))
 993                 return CONNECTED;
 994         if (Client_Type(Client) == CLIENT_USER &&
 995             current_count >= MAX_HNDL_CHANNEL_LISTS)
 996                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
 997                                           Client_ID(Client),
 998                                           Channel_Name(Channel), mask,
 999                                           MAX_HNDL_CHANNEL_LISTS);
1000
1001         switch (what) {
1002                 case 'I':
1003                         if (!Channel_AddInvite(Channel, mask, false))
1004                                 return CONNECTED;
1005                         break;
1006                 case 'b':
1007                         if (!Channel_AddBan(Channel, mask))
1008                                 return CONNECTED;
1009                         break;
1010                 case 'e':
1011                         if (!Channel_AddExcept(Channel, mask))
1012                                 return CONNECTED;
1013                         break;
1014         }
1015         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1016 }
1017
1018 /**
1019  * Delete entries from channel invite, ban and exception lists.
1020  *
1021  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1022  * @param Prefix The originator of the command.
1023  * @param Client The sender of the command.
1024  * @param Channel The channel of which the list should be modified.
1025  * @param Pattern The pattern to add to the list.
1026  * @return CONNECTED or DISCONNECTED.
1027  */
1028 static bool
1029 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1030               const char *Pattern)
1031 {
1032         char mask[MASK_LEN];
1033         struct list_head *list = NULL;
1034
1035         assert(Client != NULL);
1036         assert(Channel != NULL);
1037         assert(Pattern != NULL);
1038         assert(what == 'I' || what == 'b' || what == 'e');
1039
1040         Lists_MakeMask(Pattern, mask, sizeof(mask));
1041
1042         switch (what) {
1043                 case 'I':
1044                         list = Channel_GetListInvites(Channel);
1045                         break;
1046                 case 'b':
1047                         list = Channel_GetListBans(Channel);
1048                         break;
1049                 case 'e':
1050                         list = Channel_GetListExcepts(Channel);
1051                         break;
1052         }
1053
1054         if (!Lists_CheckDupeMask(list, mask))
1055                 return CONNECTED;
1056         Lists_Del(list, mask);
1057
1058         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1059 }
1060
1061 /**
1062  * Send information about changed channel invite/ban/exception lists to clients.
1063  *
1064  * @param IsAdd true if the list item has been added, false otherwise.
1065  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1066  * @param Prefix The originator of the mode list change.
1067  * @param Client The sender of the command.
1068  * @param Channel The channel of which the list has been modified.
1069  * @param Mask The mask which has been added or removed.
1070  * @return CONNECTED or DISCONNECTED.
1071  */
1072 static bool
1073 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1074                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1075 {
1076         bool ok = true;
1077
1078         /* Send confirmation to the client */
1079         if (Client_Type(Client) == CLIENT_USER)
1080                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1081                                               Channel_Name(Channel),
1082                                               IsAdd ? '+' : '-',
1083                                               ModeChar, Mask);
1084
1085         /* to other servers */
1086         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1087                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1088                                   ModeChar, Mask);
1089
1090         /* and local users in channel */
1091         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1092                                   "MODE %s %c%c %s", Channel_Name(Channel),
1093                                   IsAdd ? '+' : '-', ModeChar, Mask );
1094
1095         return ok;
1096 } /* Send_ListChange */
1097
1098 /* -eof- */