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_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 /**
  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 'C': /* Only messages from clients sharing a channel */
 218                 case 'i': /* Invisible */
 219                 case 's': /* Server messages */
 220                 case 'w': /* Wallops messages */
 221                         x[0] = *mode_ptr;
 222                         break;
 223                 case 'a': /* Away */
 224                         if (Client_Type(Client) == CLIENT_SERVER) {
 225                                 x[0] = 'a';
 226                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 227                         } else
 228                                 ok = IRC_WriteStrClient(Origin,
 229                                                         ERR_NOPRIVILEGES_MSG,
 230                                                         Client_ID(Origin));
 231                         break;
 232                 case 'c': /* Receive connect notices
 233                            * (only settable by IRC operators!) */
 234                         if (!set || Client_Type(Client) == CLIENT_SERVER
 235                             || Client_OperByMe(Origin))
 236                                 x[0] = 'c';
 237                         else
 238                                 ok = IRC_WriteStrClient(Origin,
 239                                                         ERR_NOPRIVILEGES_MSG,
 240                                                         Client_ID(Origin));
 241                         break;
 242                 case 'o': /* IRC operator (only unsettable!) */
 243                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 244                                 Client_SetOperByMe(Target, false);
 245                                 x[0] = 'o';
 246                         } else
 247                                 ok = IRC_WriteStrClient(Origin,
 248                                                         ERR_NOPRIVILEGES_MSG,
 249                                                         Client_ID(Origin));
 250                         break;
 251                 case 'r': /* Restricted (only settable) */
 252                         if (set || Client_Type(Client) == CLIENT_SERVER)
 253                                 x[0] = 'r';
 254                         else
 255                                 ok = IRC_WriteStrClient(Origin,
 256                                                         ERR_RESTRICTED_MSG,
 257                                                         Client_ID(Origin));
 258                         break;
 259                 case 'x': /* Cloak hostname */
 260                         if (Client_HasMode(Client, 'r'))
 261                                 ok = IRC_WriteStrClient(Origin,
 262                                                         ERR_RESTRICTED_MSG,
 263                                                         Client_ID(Origin));
 264                         else
 265                                 x[0] = 'x';
 266                         break;
 267                 default:
 268                         if (Client_Type(Client) != CLIENT_SERVER) {
 269                                 Log(LOG_DEBUG,
 270                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 271                                     set ? '+' : '-', *mode_ptr,
 272                                     Client_ID(Origin));
 273                                 ok = IRC_WriteStrClient(Origin,
 274                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 275                                                         Client_ID(Origin),
 276                                                         set ? '+' : '-',
 277                                                         *mode_ptr);
 278                                 x[0] = '\0';
 279                         } else {
 280                                 Log(LOG_DEBUG,
 281                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 282                                     set ? '+' : '-', *mode_ptr,
 283                                     Client_ID(Origin), Client_ID(Target));
 284                                 x[0] = *mode_ptr;
 285                         }
 286                 }
 287
 288                 if (!ok)
 289                         break;
 290
 291                 /* Is there a valid mode change? */
 292                 if (!x[0])
 293                         continue;
 294
 295                 if (set) {
 296                         if (Client_ModeAdd(Target, x[0]))
 297                                 strlcat(the_modes, x, sizeof(the_modes));
 298                 } else {
 299                         if (Client_ModeDel(Target, x[0]))
 300                                 strlcat(the_modes, x, sizeof(the_modes));
 301                 }
 302         }
 303
 304         /* Are there changed modes? */
 305         if (the_modes[1]) {
 306                 /* Remove needless action modifier characters */
 307                 len = strlen(the_modes) - 1;
 308                 if (the_modes[len] == '+' || the_modes[len] == '-')
 309                         the_modes[len] = '\0';
 310
 311                 if (Client_Type(Client) == CLIENT_SERVER) {
 312                         /* Forward modes to other servers */
 313                         if (Client_Conn(Target) != NONE) {
 314                                 /* Remote server (service?) changed modes
 315                                  * for one of our clients. Inform it! */
 316                                 IRC_WriteStrClientPrefix(Target, Origin,
 317                                                          "MODE %s :%s",
 318                                                          Client_ID(Target),
 319                                                          the_modes);
 320                         }
 321                         IRC_WriteStrServersPrefix(Client, Origin,
 322                                                   "MODE %s :%s",
 323                                                   Client_ID(Target),
 324                                                   the_modes);
 325                 } else {
 326                         /* Send reply to client and inform other servers */
 327                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 328                                                       "MODE %s :%s",
 329                                                       Client_ID(Target),
 330                                                       the_modes);
 331                         IRC_WriteStrServersPrefix(Client, Origin,
 332                                                   "MODE %s :%s",
 333                                                   Client_ID(Target),
 334                                                   the_modes);
 335                 }
 336                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 337                          Client_TypeText(Target), Client_Mask(Target),
 338                          Client_Modes(Target));
 339         }
 340
 341         IRC_SetPenalty(Client, 1);
 342         return ok;
 343 } /* Client_Mode */
 344
 345
 346 static bool
 347 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 348 {
 349         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 350         const char *mode_ptr;
 351
 352         /* Member or not? -- That's the question! */
 353         if (!Channel_IsMemberOf(Channel, Origin))
 354                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 355                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 356
 357         /* The sender is a member: generate extended reply */
 358         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 359         mode_ptr = the_modes;
 360         the_args[0] = '\0';
 361
 362         while(*mode_ptr) {
 363                 switch(*mode_ptr) {
 364                 case 'l':
 365                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 366                         strlcat(the_args, argadd, sizeof(the_args));
 367                         break;
 368                 case 'k':
 369                         strlcat(the_args, " ", sizeof(the_args));
 370                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 371                         break;
 372                 }
 373                 mode_ptr++;
 374         }
 375         if (the_args[0])
 376                 strlcat(the_modes, the_args, sizeof(the_modes));
 377
 378         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 379                                 Client_ID(Origin), Channel_Name(Channel),
 380                                 the_modes))
 381                 return DISCONNECTED;
 382 #ifndef STRICT_RFC
 383         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 384                                   Client_ID(Origin), Channel_Name(Channel),
 385                                   Channel_CreationTime(Channel)))
 386                 return DISCONNECTED;
 387 #endif
 388         return CONNECTED;
 389 }
 390
 391
 392 /**
 393  * Handle channel mode and channel-user mode changes
 394  */
 395 static bool
 396 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 397 {
 398         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 399             argadd[CLIENT_PASS_LEN], *mode_ptr;
 400         bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
 401         int mode_arg, arg_arg, mode_arg_count = 0;
 402         CLIENT *client;
 403         long l;
 404         size_t len;
 405
 406         if (Channel_IsModeless(Channel))
 407                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 408                                 Client_ID(Client), Channel_Name(Channel));
 409
 410         /* Mode request: let's answer it :-) */
 411         if (Req->argc <= 1)
 412                 return Channel_Mode_Answer_Request(Origin, Channel);
 413
 414         Channel_CheckAdminRights(Channel, Client, Origin,
 415                                  &onchannel, &modeok, &use_servermode);
 416
 417         if (!onchannel && !modeok)
 418                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 419                                           Client_ID(Origin),
 420                                           Channel_Name(Channel));
 421
 422         mode_arg = 1;
 423         mode_ptr = Req->argv[mode_arg];
 424         if (Req->argc > mode_arg + 1)
 425                 arg_arg = mode_arg + 1;
 426         else
 427                 arg_arg = -1;
 428
 429         /* Initial state: set or unset modes? */
 430         skiponce = false;
 431         switch (*mode_ptr) {
 432         case '-':
 433                 set = false;
 434                 break;
 435         case '+':
 436                 set = true;
 437                 break;
 438         default:
 439                 set = true;
 440                 skiponce = true;
 441         }
 442
 443         /* Prepare reply string */
 444         strcpy(the_modes, set ? "+" : "-");
 445         the_args[0] = '\0';
 446
 447         x[1] = '\0';
 448         connected = CONNECTED;
 449         while (mode_ptr) {
 450                 if (!skiponce)
 451                         mode_ptr++;
 452                 if (!*mode_ptr) {
 453                         /* Try next argument if there's any */
 454                         if (arg_arg < 0)
 455                                 break;
 456                         if (arg_arg > mode_arg)
 457                                 mode_arg = arg_arg;
 458                         else
 459                                 mode_arg++;
 460
 461                         if (mode_arg >= Req->argc)
 462                                 break;
 463                         mode_ptr = Req->argv[mode_arg];
 464
 465                         if (Req->argc > mode_arg + 1)
 466                                 arg_arg = mode_arg + 1;
 467                         else
 468                                 arg_arg = -1;
 469                 }
 470                 skiponce = false;
 471
 472                 switch (*mode_ptr) {
 473                 case '+':
 474                 case '-':
 475                         if (((*mode_ptr == '+') && !set)
 476                             || ((*mode_ptr == '-') && set)) {
 477                                 /* Action modifier ("+"/"-") must be changed ... */
 478                                 len = strlen(the_modes) - 1;
 479                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 480                                         /* Adjust last action modifier in result */
 481                                         the_modes[len] = *mode_ptr;
 482                                 } else {
 483                                         /* Append modifier character to result string */
 484                                         x[0] = *mode_ptr;
 485                                         strlcat(the_modes, x, sizeof(the_modes));
 486                                 }
 487                                 set = *mode_ptr == '+';
 488                         }
 489                         continue;
 490                 }
 491
 492                 /* Are there arguments left? */
 493                 if (arg_arg >= Req->argc)
 494                         arg_arg = -1;
 495
 496                 /* Validate modes */
 497                 x[0] = '\0';
 498                 argadd[0] = '\0';
 499                 client = NULL;
 500                 switch (*mode_ptr) {
 501                 /* --- Channel modes --- */
 502                 case 'i': /* Invite only */
 503                 case 'M': /* Only identified nicks can write */
 504                 case 'm': /* Moderated */
 505                 case 'n': /* Only members can write */
 506                 case 'R': /* Registered users only */
 507                 case 's': /* Secret channel */
 508                 case 't': /* Topic locked */
 509                 case 'z': /* Secure connections only */
 510                         if (modeok)
 511                                 x[0] = *mode_ptr;
 512                         else
 513                                 connected = IRC_WriteStrClient(Origin,
 514                                         ERR_CHANOPRIVSNEEDED_MSG,
 515                                         Client_ID(Origin), Channel_Name(Channel));
 516                         break;
 517                 case 'k': /* Channel key */
 518                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 519                                 goto chan_exit;
 520                         if (!set) {
 521                                 if (modeok)
 522                                         x[0] = *mode_ptr;
 523                                 else
 524                                         connected = IRC_WriteStrClient(Origin,
 525                                                 ERR_CHANOPRIVSNEEDED_MSG,
 526                                                 Client_ID(Origin),
 527                                                 Channel_Name(Channel));
 528                                 break;
 529                         }
 530                         if (arg_arg > mode_arg) {
 531                                 if (modeok) {
 532                                         Channel_ModeDel(Channel, 'k');
 533                                         Channel_SetKey(Channel,
 534                                                        Req->argv[arg_arg]);
 535                                         strlcpy(argadd, Channel_Key(Channel),
 536                                                 sizeof(argadd));
 537                                         x[0] = *mode_ptr;
 538                                 } else {
 539                                         connected = IRC_WriteStrClient(Origin,
 540                                                 ERR_CHANOPRIVSNEEDED_MSG,
 541                                                 Client_ID(Origin),
 542                                                 Channel_Name(Channel));
 543                                 }
 544                                 Req->argv[arg_arg][0] = '\0';
 545                                 arg_arg++;
 546                         } else {
 547                                 connected = IRC_WriteStrClient(Origin,
 548                                         ERR_NEEDMOREPARAMS_MSG,
 549                                         Client_ID(Origin), Req->command);
 550                                 goto chan_exit;
 551                         }
 552                         break;
 553                 case 'l': /* Member limit */
 554                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 555                                 goto chan_exit;
 556                         if (!set) {
 557                                 if (modeok)
 558                                         x[0] = *mode_ptr;
 559                                 else
 560                                         connected = IRC_WriteStrClient(Origin,
 561                                                 ERR_CHANOPRIVSNEEDED_MSG,
 562                                                 Client_ID(Origin),
 563                                                 Channel_Name(Channel));
 564                                 break;
 565                         }
 566                         if (arg_arg > mode_arg) {
 567                                 if (modeok) {
 568                                         l = atol(Req->argv[arg_arg]);
 569                                         if (l > 0 && l < 0xFFFF) {
 570                                                 Channel_ModeDel(Channel, 'l');
 571                                                 Channel_SetMaxUsers(Channel, l);
 572                                                 snprintf(argadd, sizeof(argadd),
 573                                                          "%ld", l);
 574                                                 x[0] = *mode_ptr;
 575                                         }
 576                                 } else {
 577                                         connected = IRC_WriteStrClient(Origin,
 578                                                 ERR_CHANOPRIVSNEEDED_MSG,
 579                                                 Client_ID(Origin),
 580                                                 Channel_Name(Channel));
 581                                 }
 582                                 Req->argv[arg_arg][0] = '\0';
 583                                 arg_arg++;
 584                         } else {
 585                                 connected = IRC_WriteStrClient(Origin,
 586                                         ERR_NEEDMOREPARAMS_MSG,
 587                                         Client_ID(Origin), Req->command);
 588                                 goto chan_exit;
 589                         }
 590                         break;
 591                 case 'O': /* IRC operators only */
 592                         if (modeok) {
 593                                 /* Only IRC operators are allowed to
 594                                  * set the 'O' channel mode! */
 595                                 if (set && !(Client_OperByMe(Client)
 596                                     || Client_Type(Client) == CLIENT_SERVER))
 597                                         connected = IRC_WriteStrClient(Origin,
 598                                                 ERR_NOPRIVILEGES_MSG,
 599                                                 Client_ID(Origin));
 600                                 else
 601                                         x[0] = 'O';
 602                         } else
 603                                 connected = IRC_WriteStrClient(Origin,
 604                                                 ERR_CHANOPRIVSNEEDED_MSG,
 605                                                 Client_ID(Origin),
 606                                                 Channel_Name(Channel));
 607                                 break;
 608                 case 'P': /* Persistent channel */
 609                         if (modeok) {
 610                                 /* Only IRC operators are allowed to
 611                                  * set the 'P' channel mode! */
 612                                 if (set && !(Client_OperByMe(Client)
 613                                     || Client_Type(Client) == CLIENT_SERVER))
 614                                         connected = IRC_WriteStrClient(Origin,
 615                                                 ERR_NOPRIVILEGES_MSG,
 616                                                 Client_ID(Origin));
 617                                 else
 618                                         x[0] = 'P';
 619                         } else
 620                                 connected = IRC_WriteStrClient(Origin,
 621                                         ERR_CHANOPRIVSNEEDED_MSG,
 622                                         Client_ID(Origin),
 623                                         Channel_Name(Channel));
 624                         break;
 625                 /* --- Channel user modes --- */
 626                 case 'a':
 627                 case 'h':
 628                 case 'q':
 629                         if (Client_Type(Client) != CLIENT_SERVER) {
 630                                 connected = IRC_WriteStrClient(Origin,
 631                                         ERR_CHANOPRIVSNEEDED_MSG,
 632                                         Client_ID(Origin),
 633                                         Channel_Name(Channel));
 634                                 goto chan_exit;
 635                         }
 636                 case 'o': /* Channel operator */
 637                 case 'v': /* Voice */
 638                         if (arg_arg > mode_arg) {
 639                                 if (modeok) {
 640                                         client = Client_Search(Req->argv[arg_arg]);
 641                                         if (client)
 642                                                 x[0] = *mode_ptr;
 643                                         else
 644                                                 connected = IRC_WriteStrClient(Client,
 645                                                         ERR_NOSUCHNICK_MSG,
 646                                                         Client_ID(Client),
 647                                                         Req->argv[arg_arg]);
 648                                 } else {
 649                                         connected = IRC_WriteStrClient(Origin,
 650                                                 ERR_CHANOPRIVSNEEDED_MSG,
 651                                                 Client_ID(Origin),
 652                                                 Channel_Name(Channel));
 653                                 }
 654                                 Req->argv[arg_arg][0] = '\0';
 655                                 arg_arg++;
 656                         } else {
 657                                 connected = IRC_WriteStrClient(Origin,
 658                                         ERR_NEEDMOREPARAMS_MSG,
 659                                         Client_ID(Origin), Req->command);
 660                                 goto chan_exit;
 661                         }
 662                         break;
 663                 /* --- Channel lists --- */
 664                 case 'I': /* Invite lists */
 665                 case 'b': /* Ban lists */
 666                 case 'e': /* Channel exception lists */
 667                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 668                                 goto chan_exit;
 669                         if (arg_arg > mode_arg) {
 670                                 /* modify list */
 671                                 if (modeok) {
 672                                         connected = set
 673                                            ? Add_To_List(*mode_ptr, Origin,
 674                                                 Client, Channel,
 675                                                 Req->argv[arg_arg])
 676                                            : Del_From_List(*mode_ptr, Origin,
 677                                                 Client, Channel,
 678                                                 Req->argv[arg_arg]);
 679                                 } else {
 680                                         connected = IRC_WriteStrClient(Origin,
 681                                                 ERR_CHANOPRIVSNEEDED_MSG,
 682                                                 Client_ID(Origin),
 683                                                 Channel_Name(Channel));
 684                                 }
 685                                 Req->argv[arg_arg][0] = '\0';
 686                                 arg_arg++;
 687                         } else {
 688                                 switch (*mode_ptr) {
 689                                 case 'I':
 690                                         Channel_ShowInvites(Origin, Channel);
 691                                         break;
 692                                 case 'b':
 693                                         Channel_ShowBans(Origin, Channel);
 694                                         break;
 695                                 case 'e':
 696                                         Channel_ShowExcepts(Origin, Channel);
 697                                         break;
 698                                 }
 699                         }
 700                         break;
 701                 default:
 702                         if (Client_Type(Client) != CLIENT_SERVER) {
 703                                 Log(LOG_DEBUG,
 704                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 705                                     set ? '+' : '-', *mode_ptr,
 706                                     Client_ID(Origin), Channel_Name(Channel));
 707                                 connected = IRC_WriteStrClient(Origin,
 708                                         ERR_UNKNOWNMODE_MSG,
 709                                         Client_ID(Origin), *mode_ptr,
 710                                         Channel_Name(Channel));
 711                                 x[0] = '\0';
 712                         } else {
 713                                 Log(LOG_DEBUG,
 714                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 715                                     set ? '+' : '-', *mode_ptr,
 716                                     Client_ID(Origin), Channel_Name(Channel));
 717                                 x[0] = *mode_ptr;
 718                         }
 719                 }
 720
 721                 if (!connected)
 722                         break;
 723
 724                 /* Is there a valid mode change? */
 725                 if (!x[0])
 726                         continue;
 727
 728                 /* Validate target client */
 729                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 730                         if (!IRC_WriteStrClient
 731                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 732                              Client_ID(Origin), Client_ID(client),
 733                              Channel_Name(Channel)))
 734                                 break;
 735
 736                         continue;
 737                 }
 738
 739                 if (client) {
 740                         /* Channel-User-Mode */
 741                         retval = set
 742                                ? Channel_UserModeAdd(Channel, client, x[0])
 743                                : Channel_UserModeDel(Channel, client, x[0]);
 744                         if (retval) {
 745                                 strlcat(the_args, " ", sizeof(the_args));
 746                                 strlcat(the_args, Client_ID(client),
 747                                         sizeof(the_args));
 748                                 strlcat(the_modes, x, sizeof(the_modes));
 749                                 LogDebug
 750                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 751                                      Client_Mask(client), Channel_Name(Channel),
 752                                      Channel_UserModes(Channel, client));
 753                         }
 754                 } else {
 755                         /* Channel-Mode */
 756                         retval = set
 757                                ? Channel_ModeAdd(Channel, x[0])
 758                                : Channel_ModeDel(Channel, x[0]);
 759                         if (retval) {
 760                                 strlcat(the_modes, x, sizeof(the_modes));
 761                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 762                                          Channel_Name(Channel),
 763                                          Channel_Modes(Channel));
 764                         }
 765                 }
 766
 767                 /* Are there additional arguments to add? */
 768                 if (argadd[0]) {
 769                         strlcat(the_args, " ", sizeof(the_args));
 770                         strlcat(the_args, argadd, sizeof(the_args));
 771                 }
 772         }
 773
 774       chan_exit:
 775         /* Are there changed modes? */
 776         if (the_modes[1]) {
 777                 /* Clean up mode string */
 778                 len = strlen(the_modes) - 1;
 779                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 780                         the_modes[len] = '\0';
 781
 782                 if (Client_Type(Client) == CLIENT_SERVER) {
 783                         /* MODE requests for local channels from other servers
 784                          * are definitely invalid! */
 785                         if (Channel_IsLocal(Channel)) {
 786                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 787                                 return CONNECTED;
 788                         }
 789
 790                         /* Forward mode changes to channel users and all the
 791                          * other remote servers: */
 792                         IRC_WriteStrServersPrefix(Client, Origin,
 793                                 "MODE %s %s%s", Channel_Name(Channel),
 794                                 the_modes, the_args);
 795                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 796                                 false, "MODE %s %s%s", Channel_Name(Channel),
 797                                 the_modes, the_args);
 798                 } else {
 799                         if (use_servermode)
 800                                 Origin = Client_ThisServer();
 801                         /* Send reply to client and inform other servers and channel users */
 802                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 803                                         "MODE %s %s%s", Channel_Name(Channel),
 804                                         the_modes, the_args);
 805                         /* Only forward requests for non-local channels */
 806                         if (!Channel_IsLocal(Channel))
 807                                 IRC_WriteStrServersPrefix(Client, Origin,
 808                                         "MODE %s %s%s", Channel_Name(Channel),
 809                                         the_modes, the_args);
 810                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 811                                 false, "MODE %s %s%s", Channel_Name(Channel),
 812                                 the_modes, the_args);
 813                 }
 814         }
 815
 816         IRC_SetPenalty(Client, 1);
 817         return connected;
 818 } /* Channel_Mode */
 819
 820
 821 GLOBAL bool
 822 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 823 {
 824         assert( Client != NULL );
 825         assert( Req != NULL );
 826
 827         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 828
 829         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 830         {
 831                 Client_SetAway( Client, Req->argv[0] );
 832                 Client_ModeAdd( Client, 'a' );
 833                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 834                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 835         }
 836         else
 837         {
 838                 Client_ModeDel( Client, 'a' );
 839                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 840                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 841         }
 842 } /* IRC_AWAY */
 843
 844
 845 /**
 846  * Add entries to channel invite, ban and exception lists.
 847  *
 848  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 849  * @param Prefix The originator of the command.
 850  * @param Client The sender of the command.
 851  * @param Channel The channel of which the list should be modified.
 852  * @param Pattern The pattern to add to the list.
 853  * @return CONNECTED or DISCONNECTED.
 854  */
 855 static bool
 856 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 857             const char *Pattern)
 858 {
 859         const char *mask;
 860         struct list_head *list = NULL;
 861         long int current_count;
 862
 863         assert(Client != NULL);
 864         assert(Channel != NULL);
 865         assert(Pattern != NULL);
 866         assert(what == 'I' || what == 'b' || what == 'e');
 867
 868         mask = Lists_MakeMask(Pattern);
 869         current_count = Lists_Count(Channel_GetListInvites(Channel))
 870                         + Lists_Count(Channel_GetListExcepts(Channel))
 871                         + Lists_Count(Channel_GetListBans(Channel));
 872
 873         switch(what) {
 874                 case 'I':
 875                         list = Channel_GetListInvites(Channel);
 876                         break;
 877                 case 'b':
 878                         list = Channel_GetListBans(Channel);
 879                         break;
 880                 case 'e':
 881                         list = Channel_GetListExcepts(Channel);
 882                         break;
 883         }
 884
 885         if (Lists_CheckDupeMask(list, mask))
 886                 return CONNECTED;
 887         if (Client_Type(Client) == CLIENT_USER &&
 888             current_count >= MAX_HNDL_CHANNEL_LISTS)
 889                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
 890                                           Client_ID(Client),
 891                                           Channel_Name(Channel), mask,
 892                                           MAX_HNDL_CHANNEL_LISTS);
 893
 894         switch (what) {
 895                 case 'I':
 896                         if (!Channel_AddInvite(Channel, mask, false))
 897                                 return CONNECTED;
 898                         break;
 899                 case 'b':
 900                         if (!Channel_AddBan(Channel, mask))
 901                                 return CONNECTED;
 902                         break;
 903                 case 'e':
 904                         if (!Channel_AddExcept(Channel, mask))
 905                                 return CONNECTED;
 906                         break;
 907         }
 908         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
 909 }
 910
 911
 912 /**
 913  * Delete entries from channel invite, ban and exeption lists.
 914  *
 915  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 916  * @param Prefix The originator of the command.
 917  * @param Client The sender of the command.
 918  * @param Channel The channel of which the list should be modified.
 919  * @param Pattern The pattern to add to the list.
 920  * @return CONNECTED or DISCONNECTED.
 921  */
 922 static bool
 923 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 924               const char *Pattern)
 925 {
 926         const char *mask;
 927         struct list_head *list = NULL;
 928
 929         assert(Client != NULL);
 930         assert(Channel != NULL);
 931         assert(Pattern != NULL);
 932         assert(what == 'I' || what == 'b' || what == 'e');
 933
 934         mask = Lists_MakeMask(Pattern);
 935
 936         switch (what) {
 937                 case 'I':
 938                         list = Channel_GetListInvites(Channel);
 939                         break;
 940                 case 'b':
 941                         list = Channel_GetListBans(Channel);
 942                         break;
 943                 case 'e':
 944                         list = Channel_GetListExcepts(Channel);
 945                         break;
 946         }
 947
 948         if (!Lists_CheckDupeMask(list, mask))
 949                 return CONNECTED;
 950         Lists_Del(list, mask);
 951
 952         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
 953 }
 954
 955
 956 /**
 957  * Send information about changed channel invite/ban/exception lists to clients.
 958  *
 959  * @param IsAdd true if the list item has been added, false otherwise.
 960  * @param ModeChar The mode to use (e. g. 'b' or 'I')
 961  * @param Prefix The originator of the mode list change.
 962  * @param Client The sender of the command.
 963  * @param Channel The channel of which the list has been modified.
 964  * @param Mask The mask which has been added or removed.
 965  * @return CONNECTED or DISCONNECTED.
 966  */
 967 static bool
 968 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
 969                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
 970 {
 971         bool ok = true;
 972
 973         /* Send confirmation to the client */
 974         if (Client_Type(Client) == CLIENT_USER)
 975                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
 976                                               Channel_Name(Channel),
 977                                               IsAdd ? '+' : '-',
 978                                               ModeChar, Mask);
 979
 980         /* to other servers */
 981         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
 982                                   Channel_Name(Channel), IsAdd ? '+' : '-',
 983                                   ModeChar, Mask);
 984
 985         /* and local users in channel */
 986         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
 987                                   "MODE %s %c%c %s", Channel_Name(Channel),
 988                                   IsAdd ? '+' : '-', ModeChar, Mask );
 989
 990         return ok;
 991 } /* Send_ListChange */
 992
 993
 994 /* -eof- */