src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * 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-write.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "parse.h"
  32 #include "messages.h"
  33 #include "conf.h"
  34
  35 #include "exp.h"
  36 #include "irc-mode.h"
  37
  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_Ban_Invite PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  45                                    CHANNEL *Channel, const char *Pattern));
  46 static bool Del_Ban_Invite 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 /**
  55  * Handler for the IRC "MODE" command.
  56  *
  57  * See RFC 2812 section 3.1.5 ("user mode message") and section 3.2.3
  58  * ("channel mode message"), and RFC 2811 section 4 ("channel modes").
  59  *
  60  * @param Client        The client from which this command has been received.
  61  * @param Req           Request structure with prefix and all parameters.
  62  * @returns             CONNECTED or DISCONNECTED.
  63  */
  64 GLOBAL bool
  65 IRC_MODE( CLIENT *Client, REQUEST *Req )
  66 {
  67         CLIENT *cl, *origin;
  68         CHANNEL *chan;
  69
  70         assert(Client != NULL);
  71         assert(Req != NULL);
  72
  73         /* No parameters? */
  74         if (Req->argc < 1)
  75                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  76                                           Client_ID(Client), Req->command);
  77
  78         /* Origin for answers */
  79         if (Client_Type(Client) == CLIENT_SERVER) {
  80                 origin = Client_Search(Req->prefix);
  81                 if (!origin)
  82                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  83                                                   Client_ID(Client),
  84                                                   Req->prefix);
  85         } else
  86                 origin = Client;
  87
  88         /* Channel or user mode? */
  89         cl = NULL; chan = NULL;
  90         if (Client_IsValidNick(Req->argv[0]))
  91                 cl = Client_Search(Req->argv[0]);
  92         if (Channel_IsValidName(Req->argv[0]))
  93                 chan = Channel_Search(Req->argv[0]);
  94
  95         if (cl)
  96                 return Client_Mode(Client, Req, origin, cl);
  97         if (chan)
  98                 return Channel_Mode(Client, Req, origin, chan);
  99
 100         /* No target found! */
 101         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 102                         Client_ID(Client), Req->argv[0]);
 103 } /* IRC_MODE */
 104
 105
 106 /**
 107  * Check if the "mode limit" for a client has been reached.
 108  *
 109  * This limit doesn't apply for servers or services!
 110  *
 111  * @param Client The client to check.
 112  * @param Count The number of modes already handled.
 113  * @return true if the limit has been reached.
 114  */
 115 static bool
 116 Mode_Limit_Reached(CLIENT *Client, int Count)
 117 {
 118         if (Client_Type(Client) == CLIENT_SERVER
 119             || Client_Type(Client) == CLIENT_SERVICE)
 120                 return false;
 121         if (Count < MAX_HNDL_MODES_ARG)
 122                 return false;
 123         return true;
 124 }
 125
 126
 127 /**
 128  * Handle client mode requests
 129  *
 130  * @param Client        The client from which this command has been received.
 131  * @param Req           Request structure with prefix and all parameters.
 132  * @param Origin        The originator of the MODE command (prefix).
 133  * @param Target        The target (client) of this MODE command.
 134  * @returns             CONNECTED or DISCONNECTED.
 135  */
 136 static bool
 137 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 138 {
 139         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 140         bool ok, set;
 141         int mode_arg;
 142         size_t len;
 143
 144         /* Is the client allowed to request or change the modes? */
 145         if (Client_Type(Client) == CLIENT_USER) {
 146                 /* Users are only allowed to manipulate their own modes! */
 147                 if (Target != Client)
 148                         return IRC_WriteStrClient(Client,
 149                                                   ERR_USERSDONTMATCH_MSG,
 150                                                   Client_ID(Client));
 151         }
 152
 153         /* Mode request: let's answer it :-) */
 154         if (Req->argc == 1)
 155                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 156                                           Client_ID(Origin),
 157                                           Client_Modes(Target));
 158
 159         mode_arg = 1;
 160         mode_ptr = Req->argv[mode_arg];
 161
 162         /* Initial state: set or unset modes? */
 163         if (*mode_ptr == '+') {
 164                 set = true;
 165                 strcpy(the_modes, "+");
 166         } else if (*mode_ptr == '-') {
 167                 set = false;
 168                 strcpy(the_modes, "-");
 169         } else
 170                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 171                                           Client_ID(Origin));
 172
 173         x[1] = '\0';
 174         ok = CONNECTED;
 175         while (mode_ptr) {
 176                 mode_ptr++;
 177                 if (!*mode_ptr) {
 178                         /* Try next argument if there's any */
 179                         mode_arg++;
 180                         if (mode_arg < Req->argc)
 181                                 mode_ptr = Req->argv[mode_arg];
 182                         else
 183                                 break;
 184                 }
 185
 186                 switch(*mode_ptr) {
 187                   case '+':
 188                   case '-':
 189                         if ((*mode_ptr == '+' && !set)
 190                             || (*mode_ptr == '-' && set)) {
 191                                 /* Action modifier ("+"/"-") must be changed */
 192                                 len = strlen(the_modes) - 1;
 193                                 if (the_modes[len] == '+'
 194                                     || the_modes[len] == '-') {
 195                                         /* Last character in the "result
 196                                          * string" was an "action", so just
 197                                          * overwrite it with the new action */
 198                                         the_modes[len] = *mode_ptr;
 199                                 } else {
 200                                         /* Append new modifier character to
 201                                          * the resulting mode string */
 202                                         x[0] = *mode_ptr;
 203                                         strlcat(the_modes, x,
 204                                                 sizeof(the_modes));
 205                                 }
 206                                 if (*mode_ptr == '+')
 207                                         set = true;
 208                                 else
 209                                         set = false;
 210                         }
 211                         continue;
 212                 }
 213
 214                 /* Validate modes */
 215                 x[0] = '\0';
 216                 switch (*mode_ptr) {
 217                 case 'i': /* Invisible */
 218                 case 's': /* Server messages */
 219                 case 'w': /* Wallops messages */
 220                         x[0] = *mode_ptr;
 221                         break;
 222                 case 'a': /* Away */
 223                         if (Client_Type(Client) == CLIENT_SERVER) {
 224                                 x[0] = 'a';
 225                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 226                         } else
 227                                 ok = IRC_WriteStrClient(Origin,
 228                                                         ERR_NOPRIVILEGES_MSG,
 229                                                         Client_ID(Origin));
 230                         break;
 231                 case 'c': /* Receive connect notices
 232                            * (only settable by IRC operators!) */
 233                         if (!set || Client_Type(Client) == CLIENT_SERVER
 234                             || Client_OperByMe(Origin))
 235                                 x[0] = 'c';
 236                         else
 237                                 ok = IRC_WriteStrClient(Origin,
 238                                                         ERR_NOPRIVILEGES_MSG,
 239                                                         Client_ID(Origin));
 240                         break;
 241                 case 'o': /* IRC operator (only unsettable!) */
 242                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 243                                 Client_SetOperByMe(Target, false);
 244                                 x[0] = 'o';
 245                         } else
 246                                 ok = IRC_WriteStrClient(Origin,
 247                                                         ERR_NOPRIVILEGES_MSG,
 248                                                         Client_ID(Origin));
 249                         break;
 250                 case 'r': /* Restricted (only settable) */
 251                         if (set || Client_Type(Client) == CLIENT_SERVER)
 252                                 x[0] = 'r';
 253                         else
 254                                 ok = IRC_WriteStrClient(Origin,
 255                                                         ERR_RESTRICTED_MSG,
 256                                                         Client_ID(Origin));
 257                         break;
 258                 case 'x': /* Cloak hostname */
 259                         if (Client_HasMode(Client, 'r'))
 260                                 ok = IRC_WriteStrClient(Origin,
 261                                                         ERR_RESTRICTED_MSG,
 262                                                         Client_ID(Origin));
 263                         else
 264                                 x[0] = 'x';
 265                         break;
 266                 default:
 267                         if (Client_Type(Client) != CLIENT_SERVER) {
 268                                 Log(LOG_DEBUG,
 269                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 270                                     set ? '+' : '-', *mode_ptr,
 271                                     Client_ID(Origin));
 272                                 ok = IRC_WriteStrClient(Origin,
 273                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 274                                                         Client_ID(Origin),
 275                                                         set ? '+' : '-',
 276                                                         *mode_ptr);
 277                                 x[0] = '\0';
 278                         } else {
 279                                 Log(LOG_DEBUG,
 280                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 281                                     set ? '+' : '-', *mode_ptr,
 282                                     Client_ID(Origin), Client_ID(Target));
 283                                 x[0] = *mode_ptr;
 284                         }
 285                 }
 286
 287                 if (!ok)
 288                         break;
 289
 290                 /* Is there a valid mode change? */
 291                 if (!x[0])
 292                         continue;
 293
 294                 if (set) {
 295                         if (Client_ModeAdd(Target, x[0]))
 296                                 strlcat(the_modes, x, sizeof(the_modes));
 297                 } else {
 298                         if (Client_ModeDel(Target, x[0]))
 299                                 strlcat(the_modes, x, sizeof(the_modes));
 300                 }
 301         }
 302
 303         /* Are there changed modes? */
 304         if (the_modes[1]) {
 305                 /* Remove needless action modifier characters */
 306                 len = strlen(the_modes) - 1;
 307                 if (the_modes[len] == '+' || the_modes[len] == '-')
 308                         the_modes[len] = '\0';
 309
 310                 if (Client_Type(Client) == CLIENT_SERVER) {
 311                         /* Forward modes to other servers */
 312                         if (Client_Conn(Target) != NONE) {
 313                                 /* Remote server (service?) changed modes
 314                                  * for one of our clients. Inform it! */
 315                                 IRC_WriteStrClientPrefix(Target, Origin,
 316                                                          "MODE %s :%s",
 317                                                          Client_ID(Target),
 318                                                          the_modes);
 319                         }
 320                         IRC_WriteStrServersPrefix(Client, Origin,
 321                                                   "MODE %s :%s",
 322                                                   Client_ID(Target),
 323                                                   the_modes);
 324                 } else {
 325                         /* Send reply to client and inform other servers */
 326                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 327                                                       "MODE %s :%s",
 328                                                       Client_ID(Target),
 329                                                       the_modes);
 330                         IRC_WriteStrServersPrefix(Client, Origin,
 331                                                   "MODE %s :%s",
 332                                                   Client_ID(Target),
 333                                                   the_modes);
 334                 }
 335                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 336                          Client_TypeText(Target), Client_Mask(Target),
 337                          Client_Modes(Target));
 338         }
 339
 340         IRC_SetPenalty(Client, 1);
 341         return ok;
 342 } /* Client_Mode */
 343
 344
 345 static bool
 346 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 347 {
 348         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 349         const char *mode_ptr;
 350
 351         /* Member or not? -- That's the question! */
 352         if (!Channel_IsMemberOf(Channel, Origin))
 353                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 354                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 355
 356         /* The sender is a member: generate extended reply */
 357         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 358         mode_ptr = the_modes;
 359         the_args[0] = '\0';
 360
 361         while(*mode_ptr) {
 362                 switch(*mode_ptr) {
 363                 case 'l':
 364                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 365                         strlcat(the_args, argadd, sizeof(the_args));
 366                         break;
 367                 case 'k':
 368                         strlcat(the_args, " ", sizeof(the_args));
 369                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 370                         break;
 371                 }
 372                 mode_ptr++;
 373         }
 374         if (the_args[0])
 375                 strlcat(the_modes, the_args, sizeof(the_modes));
 376
 377         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 378                                 Client_ID(Origin), Channel_Name(Channel),
 379                                 the_modes))
 380                 return DISCONNECTED;
 381 #ifndef STRICT_RFC
 382         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 383                                   Client_ID(Origin), Channel_Name(Channel),
 384                                   Channel_CreationTime(Channel)))
 385                 return DISCONNECTED;
 386 #endif
 387         return CONNECTED;
 388 }
 389
 390
 391 /**
 392  * Handle channel mode and channel-user mode changes
 393  */
 394 static bool
 395 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 396 {
 397         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 398             argadd[CLIENT_PASS_LEN], *mode_ptr;
 399         bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
 400         int mode_arg, arg_arg, mode_arg_count = 0;
 401         CLIENT *client;
 402         long l;
 403         size_t len;
 404
 405         if (Channel_IsModeless(Channel))
 406                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 407                                 Client_ID(Client), Channel_Name(Channel));
 408
 409         /* Mode request: let's answer it :-) */
 410         if (Req->argc <= 1)
 411                 return Channel_Mode_Answer_Request(Origin, Channel);
 412
 413         Channel_CheckAdminRights(Channel, Client, Origin,
 414                                  &onchannel, &modeok, &use_servermode);
 415
 416         if (!onchannel && !modeok)
 417                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 418                                           Client_ID(Origin),
 419                                           Channel_Name(Channel));
 420
 421         mode_arg = 1;
 422         mode_ptr = Req->argv[mode_arg];
 423         if (Req->argc > mode_arg + 1)
 424                 arg_arg = mode_arg + 1;
 425         else
 426                 arg_arg = -1;
 427
 428         /* Initial state: set or unset modes? */
 429         skiponce = false;
 430         switch (*mode_ptr) {
 431         case '-':
 432                 set = false;
 433                 break;
 434         case '+':
 435                 set = true;
 436                 break;
 437         default:
 438                 set = true;
 439                 skiponce = true;
 440         }
 441
 442         /* Prepare reply string */
 443         strcpy(the_modes, set ? "+" : "-");
 444         the_args[0] = '\0';
 445
 446         x[1] = '\0';
 447         connected = CONNECTED;
 448         while (mode_ptr) {
 449                 if (!skiponce)
 450                         mode_ptr++;
 451                 if (!*mode_ptr) {
 452                         /* Try next argument if there's any */
 453                         if (arg_arg < 0)
 454                                 break;
 455                         if (arg_arg > mode_arg)
 456                                 mode_arg = arg_arg;
 457                         else
 458                                 mode_arg++;
 459
 460                         if (mode_arg >= Req->argc)
 461                                 break;
 462                         mode_ptr = Req->argv[mode_arg];
 463
 464                         if (Req->argc > mode_arg + 1)
 465                                 arg_arg = mode_arg + 1;
 466                         else
 467                                 arg_arg = -1;
 468                 }
 469                 skiponce = false;
 470
 471                 switch (*mode_ptr) {
 472                 case '+':
 473                 case '-':
 474                         if (((*mode_ptr == '+') && !set)
 475                             || ((*mode_ptr == '-') && set)) {
 476                                 /* Action modifier ("+"/"-") must be changed ... */
 477                                 len = strlen(the_modes) - 1;
 478                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 479                                         /* Adjust last action modifier in result */
 480                                         the_modes[len] = *mode_ptr;
 481                                 } else {
 482                                         /* Append modifier character to result string */
 483                                         x[0] = *mode_ptr;
 484                                         strlcat(the_modes, x, sizeof(the_modes));
 485                                 }
 486                                 set = *mode_ptr == '+';
 487                         }
 488                         continue;
 489                 }
 490
 491                 /* Are there arguments left? */
 492                 if (arg_arg >= Req->argc)
 493                         arg_arg = -1;
 494
 495                 /* Validate modes */
 496                 x[0] = '\0';
 497                 argadd[0] = '\0';
 498                 client = NULL;
 499                 switch (*mode_ptr) {
 500                 /* --- Channel modes --- */
 501                 case 'i': /* Invite only */
 502                 case 'm': /* Moderated */
 503                 case 'n': /* Only members can write */
 504                 case 'R': /* Registered users only */
 505                 case 's': /* Secret channel */
 506                 case 't': /* Topic locked */
 507                 case 'z': /* Secure connections only */
 508                         if (modeok)
 509                                 x[0] = *mode_ptr;
 510                         else
 511                                 connected = IRC_WriteStrClient(Origin,
 512                                         ERR_CHANOPRIVSNEEDED_MSG,
 513                                         Client_ID(Origin), Channel_Name(Channel));
 514                         break;
 515                 case 'k': /* Channel key */
 516                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 517                                 goto chan_exit;
 518                         if (!set) {
 519                                 if (modeok)
 520                                         x[0] = *mode_ptr;
 521                                 else
 522                                         connected = IRC_WriteStrClient(Origin,
 523                                                 ERR_CHANOPRIVSNEEDED_MSG,
 524                                                 Client_ID(Origin),
 525                                                 Channel_Name(Channel));
 526                                 break;
 527                         }
 528                         if (arg_arg > mode_arg) {
 529                                 if (modeok) {
 530                                         Channel_ModeDel(Channel, 'k');
 531                                         Channel_SetKey(Channel,
 532                                                        Req->argv[arg_arg]);
 533                                         strlcpy(argadd, Channel_Key(Channel),
 534                                                 sizeof(argadd));
 535                                         x[0] = *mode_ptr;
 536                                 } else {
 537                                         connected = IRC_WriteStrClient(Origin,
 538                                                 ERR_CHANOPRIVSNEEDED_MSG,
 539                                                 Client_ID(Origin),
 540                                                 Channel_Name(Channel));
 541                                 }
 542                                 Req->argv[arg_arg][0] = '\0';
 543                                 arg_arg++;
 544                         } else {
 545                                 connected = IRC_WriteStrClient(Origin,
 546                                         ERR_NEEDMOREPARAMS_MSG,
 547                                         Client_ID(Origin), Req->command);
 548                                 goto chan_exit;
 549                         }
 550                         break;
 551                 case 'l': /* Member limit */
 552                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 553                                 goto chan_exit;
 554                         if (!set) {
 555                                 if (modeok)
 556                                         x[0] = *mode_ptr;
 557                                 else
 558                                         connected = IRC_WriteStrClient(Origin,
 559                                                 ERR_CHANOPRIVSNEEDED_MSG,
 560                                                 Client_ID(Origin),
 561                                                 Channel_Name(Channel));
 562                                 break;
 563                         }
 564                         if (arg_arg > mode_arg) {
 565                                 if (modeok) {
 566                                         l = atol(Req->argv[arg_arg]);
 567                                         if (l > 0 && l < 0xFFFF) {
 568                                                 Channel_ModeDel(Channel, 'l');
 569                                                 Channel_SetMaxUsers(Channel, l);
 570                                                 snprintf(argadd, sizeof(argadd),
 571                                                          "%ld", l);
 572                                                 x[0] = *mode_ptr;
 573                                         }
 574                                 } else {
 575                                         connected = IRC_WriteStrClient(Origin,
 576                                                 ERR_CHANOPRIVSNEEDED_MSG,
 577                                                 Client_ID(Origin),
 578                                                 Channel_Name(Channel));
 579                                 }
 580                                 Req->argv[arg_arg][0] = '\0';
 581                                 arg_arg++;
 582                         } else {
 583                                 connected = IRC_WriteStrClient(Origin,
 584                                         ERR_NEEDMOREPARAMS_MSG,
 585                                         Client_ID(Origin), Req->command);
 586                                 goto chan_exit;
 587                         }
 588                         break;
 589                 case 'O': /* IRC operators only */
 590                         if (modeok) {
 591                                 /* Only IRC operators are allowed to
 592                                  * set the 'O' channel mode! */
 593                                 if (set && !(Client_OperByMe(Client)
 594                                     || Client_Type(Client) == CLIENT_SERVER))
 595                                         connected = IRC_WriteStrClient(Origin,
 596                                                 ERR_NOPRIVILEGES_MSG,
 597                                                 Client_ID(Origin));
 598                                 else
 599                                         x[0] = 'O';
 600                         } else
 601                                 connected = IRC_WriteStrClient(Origin,
 602                                                 ERR_CHANOPRIVSNEEDED_MSG,
 603                                                 Client_ID(Origin),
 604                                                 Channel_Name(Channel));
 605                                 break;
 606                 case 'P': /* Persistent channel */
 607                         if (modeok) {
 608                                 /* Only IRC operators are allowed to
 609                                  * set the 'P' channel mode! */
 610                                 if (set && !(Client_OperByMe(Client)
 611                                     || Client_Type(Client) == CLIENT_SERVER))
 612                                         connected = IRC_WriteStrClient(Origin,
 613                                                 ERR_NOPRIVILEGES_MSG,
 614                                                 Client_ID(Origin));
 615                                 else
 616                                         x[0] = 'P';
 617                         } else
 618                                 connected = IRC_WriteStrClient(Origin,
 619                                         ERR_CHANOPRIVSNEEDED_MSG,
 620                                         Client_ID(Origin),
 621                                         Channel_Name(Channel));
 622                         break;
 623                 /* --- Channel user modes --- */
 624                 case 'a':
 625                 case 'h':
 626                 case 'q':
 627                         if (Client_Type(Client) != CLIENT_SERVER) {
 628                                 connected = IRC_WriteStrClient(Origin,
 629                                         ERR_CHANOPRIVSNEEDED_MSG,
 630                                         Client_ID(Origin),
 631                                         Channel_Name(Channel));
 632                                 goto chan_exit;
 633                         }
 634                 case 'o': /* Channel operator */
 635                 case 'v': /* Voice */
 636                         if (arg_arg > mode_arg) {
 637                                 if (modeok) {
 638                                         client = Client_Search(Req->argv[arg_arg]);
 639                                         if (client)
 640                                                 x[0] = *mode_ptr;
 641                                         else
 642                                                 connected = IRC_WriteStrClient(Client,
 643                                                         ERR_NOSUCHNICK_MSG,
 644                                                         Client_ID(Client),
 645                                                         Req->argv[arg_arg]);
 646                                 } else {
 647                                         connected = IRC_WriteStrClient(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                                 connected = IRC_WriteStrClient(Origin,
 656                                         ERR_NEEDMOREPARAMS_MSG,
 657                                         Client_ID(Origin), Req->command);
 658                                 goto chan_exit;
 659                         }
 660                         break;
 661                 /* --- Channel lists --- */
 662                 case 'I': /* Invite lists */
 663                 case 'b': /* Ban lists */
 664                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 665                                 goto chan_exit;
 666                         if (arg_arg > mode_arg) {
 667                                 /* modify list */
 668                                 if (modeok) {
 669                                         connected = set
 670                                            ? Add_Ban_Invite(*mode_ptr, Origin,
 671                                                 Client, Channel,
 672                                                 Req->argv[arg_arg])
 673                                            : Del_Ban_Invite(*mode_ptr, Origin,
 674                                                 Client, Channel,
 675                                                 Req->argv[arg_arg]);
 676                                 } else {
 677                                         connected = IRC_WriteStrClient(Origin,
 678                                                 ERR_CHANOPRIVSNEEDED_MSG,
 679                                                 Client_ID(Origin),
 680                                                 Channel_Name(Channel));
 681                                 }
 682                                 Req->argv[arg_arg][0] = '\0';
 683                                 arg_arg++;
 684                         } else {
 685                                 if (*mode_ptr == 'I')
 686                                         Channel_ShowInvites(Origin, Channel);
 687                                 else
 688                                         Channel_ShowBans(Origin, Channel);
 689                         }
 690                         break;
 691                 default:
 692                         if (Client_Type(Client) != CLIENT_SERVER) {
 693                                 Log(LOG_DEBUG,
 694                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 695                                     set ? '+' : '-', *mode_ptr,
 696                                     Client_ID(Origin), Channel_Name(Channel));
 697                                 connected = IRC_WriteStrClient(Origin,
 698                                         ERR_UNKNOWNMODE_MSG,
 699                                         Client_ID(Origin), *mode_ptr,
 700                                         Channel_Name(Channel));
 701                                 x[0] = '\0';
 702                         } else {
 703                                 Log(LOG_DEBUG,
 704                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 705                                     set ? '+' : '-', *mode_ptr,
 706                                     Client_ID(Origin), Channel_Name(Channel));
 707                                 x[0] = *mode_ptr;
 708                         }
 709                 }
 710
 711                 if (!connected)
 712                         break;
 713
 714                 /* Is there a valid mode change? */
 715                 if (!x[0])
 716                         continue;
 717
 718                 /* Validate target client */
 719                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 720                         if (!IRC_WriteStrClient
 721                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 722                              Client_ID(Origin), Client_ID(client),
 723                              Channel_Name(Channel)))
 724                                 break;
 725
 726                         continue;
 727                 }
 728
 729                 if (client) {
 730                         /* Channel-User-Mode */
 731                         retval = set
 732                                ? Channel_UserModeAdd(Channel, client, x[0])
 733                                : Channel_UserModeDel(Channel, client, x[0]);
 734                         if (retval) {
 735                                 strlcat(the_args, " ", sizeof(the_args));
 736                                 strlcat(the_args, Client_ID(client),
 737                                         sizeof(the_args));
 738                                 strlcat(the_modes, x, sizeof(the_modes));
 739                                 LogDebug
 740                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 741                                      Client_Mask(client), Channel_Name(Channel),
 742                                      Channel_UserModes(Channel, client));
 743                         }
 744                 } else {
 745                         /* Channel-Mode */
 746                         retval = set
 747                                ? Channel_ModeAdd(Channel, x[0])
 748                                : Channel_ModeDel(Channel, x[0]);
 749                         if (retval) {
 750                                 strlcat(the_modes, x, sizeof(the_modes));
 751                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 752                                          Channel_Name(Channel),
 753                                          Channel_Modes(Channel));
 754                         }
 755                 }
 756
 757                 /* Are there additional arguments to add? */
 758                 if (argadd[0]) {
 759                         strlcat(the_args, " ", sizeof(the_args));
 760                         strlcat(the_args, argadd, sizeof(the_args));
 761                 }
 762         }
 763
 764       chan_exit:
 765         /* Are there changed modes? */
 766         if (the_modes[1]) {
 767                 /* Clean up mode string */
 768                 len = strlen(the_modes) - 1;
 769                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 770                         the_modes[len] = '\0';
 771
 772                 if (Client_Type(Client) == CLIENT_SERVER) {
 773                         /* MODE requests for local channels from other servers
 774                          * are definitely invalid! */
 775                         if (Channel_IsLocal(Channel)) {
 776                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 777                                 return CONNECTED;
 778                         }
 779
 780                         /* Forward mode changes to channel users and all the
 781                          * other remote servers: */
 782                         IRC_WriteStrServersPrefix(Client, Origin,
 783                                 "MODE %s %s%s", Channel_Name(Channel),
 784                                 the_modes, the_args);
 785                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 786                                 false, "MODE %s %s%s", Channel_Name(Channel),
 787                                 the_modes, the_args);
 788                 } else {
 789                         if (use_servermode)
 790                                 Origin = Client_ThisServer();
 791                         /* Send reply to client and inform other servers and channel users */
 792                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 793                                         "MODE %s %s%s", Channel_Name(Channel),
 794                                         the_modes, the_args);
 795                         /* Only forward requests for non-local channels */
 796                         if (!Channel_IsLocal(Channel))
 797                                 IRC_WriteStrServersPrefix(Client, Origin,
 798                                         "MODE %s %s%s", Channel_Name(Channel),
 799                                         the_modes, the_args);
 800                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 801                                 false, "MODE %s %s%s", Channel_Name(Channel),
 802                                 the_modes, the_args);
 803                 }
 804         }
 805
 806         IRC_SetPenalty(Client, 1);
 807         return connected;
 808 } /* Channel_Mode */
 809
 810
 811 GLOBAL bool
 812 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 813 {
 814         assert( Client != NULL );
 815         assert( Req != NULL );
 816
 817         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 818
 819         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 820         {
 821                 Client_SetAway( Client, Req->argv[0] );
 822                 Client_ModeAdd( Client, 'a' );
 823                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 824                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 825         }
 826         else
 827         {
 828                 Client_ModeDel( Client, 'a' );
 829                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 830                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 831         }
 832 } /* IRC_AWAY */
 833
 834
 835 /**
 836  * Add entries to channel ban and invite lists.
 837  *
 838  * @param what Can be 'I' for invite or 'b' for ban list.
 839  * @param Prefix The originator of the command.
 840  * @param Client The sender of the command.
 841  * @param Channel The channel of which the list should be modified.
 842  * @param Pattern The pattern to add to the list.
 843  * @return CONNECTED or DISCONNECTED.
 844  */
 845 static bool
 846 Add_Ban_Invite(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 847                const char *Pattern)
 848 {
 849         const char *mask;
 850         struct list_head *list;
 851
 852         assert(Client != NULL);
 853         assert(Channel != NULL);
 854         assert(Pattern != NULL);
 855         assert(what == 'I' || what == 'b');
 856
 857         mask = Lists_MakeMask(Pattern);
 858
 859         if (what == 'I')
 860                 list = Channel_GetListInvites(Channel);
 861         else
 862                 list = Channel_GetListBans(Channel);
 863
 864         if (Lists_CheckDupeMask(list, mask))
 865                 return CONNECTED;
 866
 867         if (what == 'I') {
 868                 if (!Channel_AddInvite(Channel, mask, false))
 869                         return CONNECTED;
 870         } else {
 871                 if (!Channel_AddBan(Channel, mask))
 872                         return CONNECTED;
 873         }
 874         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
 875 }
 876
 877
 878 /**
 879  * Delete entries from channel ban and invite lists.
 880  *
 881  * @param what Can be 'I' for invite or 'b' for ban list.
 882  * @param Prefix The originator of the command.
 883  * @param Client The sender of the command.
 884  * @param Channel The channel of which the list should be modified.
 885  * @param Pattern The pattern to add to the list.
 886  * @return CONNECTED or DISCONNECTED.
 887  */
 888 static bool
 889 Del_Ban_Invite(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 890                const char *Pattern)
 891 {
 892         const char *mask;
 893         struct list_head *list;
 894
 895         assert(Client != NULL);
 896         assert(Channel != NULL);
 897         assert(Pattern != NULL);
 898         assert(what == 'I' || what == 'b');
 899
 900         mask = Lists_MakeMask(Pattern);
 901
 902         if (what == 'I')
 903                 list = Channel_GetListInvites(Channel);
 904         else
 905                 list = Channel_GetListBans(Channel);
 906
 907         if (!Lists_CheckDupeMask(list, mask))
 908                 return CONNECTED;
 909         Lists_Del(list, mask);
 910
 911         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
 912 }
 913
 914
 915 /**
 916  * Send information about changed channel ban/invite lists to clients.
 917  *
 918  * @param IsAdd true if the list item has been added, false otherwise.
 919  * @param ModeChar The mode to use (e. g. 'b' or 'I')
 920  * @param Prefix The originator of the mode list change.
 921  * @param Client The sender of the command.
 922  * @param Channel The channel of which the list has been modified.
 923  * @param Mask The mask which has been added or removed.
 924  * @return CONNECTED or DISCONNECTED.
 925  */
 926 static bool
 927 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
 928                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
 929 {
 930         bool ok = true;
 931
 932         /* Send confirmation to the client */
 933         if (Client_Type(Client) == CLIENT_USER)
 934                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
 935                                               Channel_Name(Channel),
 936                                               IsAdd ? '+' : '-',
 937                                               ModeChar, Mask);
 938
 939         /* to other servers */
 940         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
 941                                   Channel_Name(Channel), IsAdd ? '+' : '-',
 942                                   ModeChar, Mask);
 943
 944         /* and local users in channel */
 945         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
 946                                   "MODE %s %c%c %s", Channel_Name(Channel),
 947                                   IsAdd ? '+' : '-', ModeChar, Mask );
 948
 949         return ok;
 950 } /* Send_ListChange */
 951
 952
 953 /* -eof- */