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 'B': /* Bot */
 233                         if (Client_HasMode(Client, 'r'))
 234                                 ok = IRC_WriteStrClient(Origin,
 235                                                         ERR_RESTRICTED_MSG,
 236                                                         Client_ID(Origin));
 237                         else
 238                                 x[0] = 'B';
 239                         break;
 240                 case 'c': /* Receive connect notices
 241                            * (only settable by IRC operators!) */
 242                         if (!set || Client_Type(Client) == CLIENT_SERVER
 243                             || Client_OperByMe(Origin))
 244                                 x[0] = 'c';
 245                         else
 246                                 ok = IRC_WriteStrClient(Origin,
 247                                                         ERR_NOPRIVILEGES_MSG,
 248                                                         Client_ID(Origin));
 249                         break;
 250                 case 'o': /* IRC operator (only unsettable!) */
 251                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 252                                 Client_SetOperByMe(Target, false);
 253                                 x[0] = 'o';
 254                         } else
 255                                 ok = IRC_WriteStrClient(Origin,
 256                                                         ERR_NOPRIVILEGES_MSG,
 257                                                         Client_ID(Origin));
 258                         break;
 259                 case 'r': /* Restricted (only settable) */
 260                         if (set || Client_Type(Client) == CLIENT_SERVER)
 261                                 x[0] = 'r';
 262                         else
 263                                 ok = IRC_WriteStrClient(Origin,
 264                                                         ERR_RESTRICTED_MSG,
 265                                                         Client_ID(Origin));
 266                         break;
 267                 case 'x': /* Cloak hostname */
 268                         if (Client_HasMode(Client, 'r'))
 269                                 ok = IRC_WriteStrClient(Origin,
 270                                                         ERR_RESTRICTED_MSG,
 271                                                         Client_ID(Origin));
 272                         else
 273                                 x[0] = 'x';
 274                         break;
 275                 default:
 276                         if (Client_Type(Client) != CLIENT_SERVER) {
 277                                 Log(LOG_DEBUG,
 278                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 279                                     set ? '+' : '-', *mode_ptr,
 280                                     Client_ID(Origin));
 281                                 ok = IRC_WriteStrClient(Origin,
 282                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 283                                                         Client_ID(Origin),
 284                                                         set ? '+' : '-',
 285                                                         *mode_ptr);
 286                                 x[0] = '\0';
 287                         } else {
 288                                 Log(LOG_DEBUG,
 289                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 290                                     set ? '+' : '-', *mode_ptr,
 291                                     Client_ID(Origin), Client_ID(Target));
 292                                 x[0] = *mode_ptr;
 293                         }
 294                 }
 295
 296                 if (!ok)
 297                         break;
 298
 299                 /* Is there a valid mode change? */
 300                 if (!x[0])
 301                         continue;
 302
 303                 if (set) {
 304                         if (Client_ModeAdd(Target, x[0]))
 305                                 strlcat(the_modes, x, sizeof(the_modes));
 306                 } else {
 307                         if (Client_ModeDel(Target, x[0]))
 308                                 strlcat(the_modes, x, sizeof(the_modes));
 309                 }
 310         }
 311
 312         /* Are there changed modes? */
 313         if (the_modes[1]) {
 314                 /* Remove needless action modifier characters */
 315                 len = strlen(the_modes) - 1;
 316                 if (the_modes[len] == '+' || the_modes[len] == '-')
 317                         the_modes[len] = '\0';
 318
 319                 if (Client_Type(Client) == CLIENT_SERVER) {
 320                         /* Forward modes to other servers */
 321                         if (Client_Conn(Target) != NONE) {
 322                                 /* Remote server (service?) changed modes
 323                                  * for one of our clients. Inform it! */
 324                                 IRC_WriteStrClientPrefix(Target, Origin,
 325                                                          "MODE %s :%s",
 326                                                          Client_ID(Target),
 327                                                          the_modes);
 328                         }
 329                         IRC_WriteStrServersPrefix(Client, Origin,
 330                                                   "MODE %s :%s",
 331                                                   Client_ID(Target),
 332                                                   the_modes);
 333                 } else {
 334                         /* Send reply to client and inform other servers */
 335                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 336                                                       "MODE %s :%s",
 337                                                       Client_ID(Target),
 338                                                       the_modes);
 339                         IRC_WriteStrServersPrefix(Client, Origin,
 340                                                   "MODE %s :%s",
 341                                                   Client_ID(Target),
 342                                                   the_modes);
 343                 }
 344                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 345                          Client_TypeText(Target), Client_Mask(Target),
 346                          Client_Modes(Target));
 347         }
 348
 349         IRC_SetPenalty(Client, 1);
 350         return ok;
 351 } /* Client_Mode */
 352
 353
 354 static bool
 355 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 356 {
 357         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 358         const char *mode_ptr;
 359
 360         /* Member or not? -- That's the question! */
 361         if (!Channel_IsMemberOf(Channel, Origin))
 362                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 363                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 364
 365         /* The sender is a member: generate extended reply */
 366         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 367         mode_ptr = the_modes;
 368         the_args[0] = '\0';
 369
 370         while(*mode_ptr) {
 371                 switch(*mode_ptr) {
 372                 case 'l':
 373                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 374                         strlcat(the_args, argadd, sizeof(the_args));
 375                         break;
 376                 case 'k':
 377                         strlcat(the_args, " ", sizeof(the_args));
 378                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 379                         break;
 380                 }
 381                 mode_ptr++;
 382         }
 383         if (the_args[0])
 384                 strlcat(the_modes, the_args, sizeof(the_modes));
 385
 386         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 387                                 Client_ID(Origin), Channel_Name(Channel),
 388                                 the_modes))
 389                 return DISCONNECTED;
 390 #ifndef STRICT_RFC
 391         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 392                                   Client_ID(Origin), Channel_Name(Channel),
 393                                   Channel_CreationTime(Channel)))
 394                 return DISCONNECTED;
 395 #endif
 396         return CONNECTED;
 397 }
 398
 399
 400 /**
 401  * Handle channel mode and channel-user mode changes
 402  */
 403 static bool
 404 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 405 {
 406         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 407             argadd[CLIENT_PASS_LEN], *mode_ptr;
 408         bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
 409         int mode_arg, arg_arg, mode_arg_count = 0;
 410         CLIENT *client;
 411         long l;
 412         size_t len;
 413
 414         if (Channel_IsModeless(Channel))
 415                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 416                                 Client_ID(Client), Channel_Name(Channel));
 417
 418         /* Mode request: let's answer it :-) */
 419         if (Req->argc <= 1)
 420                 return Channel_Mode_Answer_Request(Origin, Channel);
 421
 422         Channel_CheckAdminRights(Channel, Client, Origin,
 423                                  &onchannel, &modeok, &use_servermode);
 424
 425         if (!onchannel && !modeok)
 426                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 427                                           Client_ID(Origin),
 428                                           Channel_Name(Channel));
 429
 430         mode_arg = 1;
 431         mode_ptr = Req->argv[mode_arg];
 432         if (Req->argc > mode_arg + 1)
 433                 arg_arg = mode_arg + 1;
 434         else
 435                 arg_arg = -1;
 436
 437         /* Initial state: set or unset modes? */
 438         skiponce = false;
 439         switch (*mode_ptr) {
 440         case '-':
 441                 set = false;
 442                 break;
 443         case '+':
 444                 set = true;
 445                 break;
 446         default:
 447                 set = true;
 448                 skiponce = true;
 449         }
 450
 451         /* Prepare reply string */
 452         strcpy(the_modes, set ? "+" : "-");
 453         the_args[0] = '\0';
 454
 455         x[1] = '\0';
 456         connected = CONNECTED;
 457         while (mode_ptr) {
 458                 if (!skiponce)
 459                         mode_ptr++;
 460                 if (!*mode_ptr) {
 461                         /* Try next argument if there's any */
 462                         if (arg_arg < 0)
 463                                 break;
 464                         if (arg_arg > mode_arg)
 465                                 mode_arg = arg_arg;
 466                         else
 467                                 mode_arg++;
 468
 469                         if (mode_arg >= Req->argc)
 470                                 break;
 471                         mode_ptr = Req->argv[mode_arg];
 472
 473                         if (Req->argc > mode_arg + 1)
 474                                 arg_arg = mode_arg + 1;
 475                         else
 476                                 arg_arg = -1;
 477                 }
 478                 skiponce = false;
 479
 480                 switch (*mode_ptr) {
 481                 case '+':
 482                 case '-':
 483                         if (((*mode_ptr == '+') && !set)
 484                             || ((*mode_ptr == '-') && set)) {
 485                                 /* Action modifier ("+"/"-") must be changed ... */
 486                                 len = strlen(the_modes) - 1;
 487                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 488                                         /* Adjust last action modifier in result */
 489                                         the_modes[len] = *mode_ptr;
 490                                 } else {
 491                                         /* Append modifier character to result string */
 492                                         x[0] = *mode_ptr;
 493                                         strlcat(the_modes, x, sizeof(the_modes));
 494                                 }
 495                                 set = *mode_ptr == '+';
 496                         }
 497                         continue;
 498                 }
 499
 500                 /* Are there arguments left? */
 501                 if (arg_arg >= Req->argc)
 502                         arg_arg = -1;
 503
 504                 /* Validate modes */
 505                 x[0] = '\0';
 506                 argadd[0] = '\0';
 507                 client = NULL;
 508                 switch (*mode_ptr) {
 509                 /* --- Channel modes --- */
 510                 case 'i': /* Invite only */
 511                 case 'm': /* Moderated */
 512                 case 'n': /* Only members can write */
 513                 case 'R': /* Registered users only */
 514                 case 's': /* Secret channel */
 515                 case 't': /* Topic locked */
 516                 case 'z': /* Secure connections only */
 517                         if (modeok)
 518                                 x[0] = *mode_ptr;
 519                         else
 520                                 connected = IRC_WriteStrClient(Origin,
 521                                         ERR_CHANOPRIVSNEEDED_MSG,
 522                                         Client_ID(Origin), Channel_Name(Channel));
 523                         break;
 524                 case 'k': /* Channel key */
 525                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 526                                 goto chan_exit;
 527                         if (!set) {
 528                                 if (modeok)
 529                                         x[0] = *mode_ptr;
 530                                 else
 531                                         connected = IRC_WriteStrClient(Origin,
 532                                                 ERR_CHANOPRIVSNEEDED_MSG,
 533                                                 Client_ID(Origin),
 534                                                 Channel_Name(Channel));
 535                                 break;
 536                         }
 537                         if (arg_arg > mode_arg) {
 538                                 if (modeok) {
 539                                         Channel_ModeDel(Channel, 'k');
 540                                         Channel_SetKey(Channel,
 541                                                        Req->argv[arg_arg]);
 542                                         strlcpy(argadd, Channel_Key(Channel),
 543                                                 sizeof(argadd));
 544                                         x[0] = *mode_ptr;
 545                                 } else {
 546                                         connected = IRC_WriteStrClient(Origin,
 547                                                 ERR_CHANOPRIVSNEEDED_MSG,
 548                                                 Client_ID(Origin),
 549                                                 Channel_Name(Channel));
 550                                 }
 551                                 Req->argv[arg_arg][0] = '\0';
 552                                 arg_arg++;
 553                         } else {
 554                                 connected = IRC_WriteStrClient(Origin,
 555                                         ERR_NEEDMOREPARAMS_MSG,
 556                                         Client_ID(Origin), Req->command);
 557                                 goto chan_exit;
 558                         }
 559                         break;
 560                 case 'l': /* Member limit */
 561                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 562                                 goto chan_exit;
 563                         if (!set) {
 564                                 if (modeok)
 565                                         x[0] = *mode_ptr;
 566                                 else
 567                                         connected = IRC_WriteStrClient(Origin,
 568                                                 ERR_CHANOPRIVSNEEDED_MSG,
 569                                                 Client_ID(Origin),
 570                                                 Channel_Name(Channel));
 571                                 break;
 572                         }
 573                         if (arg_arg > mode_arg) {
 574                                 if (modeok) {
 575                                         l = atol(Req->argv[arg_arg]);
 576                                         if (l > 0 && l < 0xFFFF) {
 577                                                 Channel_ModeDel(Channel, 'l');
 578                                                 Channel_SetMaxUsers(Channel, l);
 579                                                 snprintf(argadd, sizeof(argadd),
 580                                                          "%ld", l);
 581                                                 x[0] = *mode_ptr;
 582                                         }
 583                                 } else {
 584                                         connected = IRC_WriteStrClient(Origin,
 585                                                 ERR_CHANOPRIVSNEEDED_MSG,
 586                                                 Client_ID(Origin),
 587                                                 Channel_Name(Channel));
 588                                 }
 589                                 Req->argv[arg_arg][0] = '\0';
 590                                 arg_arg++;
 591                         } else {
 592                                 connected = IRC_WriteStrClient(Origin,
 593                                         ERR_NEEDMOREPARAMS_MSG,
 594                                         Client_ID(Origin), Req->command);
 595                                 goto chan_exit;
 596                         }
 597                         break;
 598                 case 'O': /* IRC operators only */
 599                         if (modeok) {
 600                                 /* Only IRC operators are allowed to
 601                                  * set the 'O' channel mode! */
 602                                 if (set && !(Client_OperByMe(Client)
 603                                     || Client_Type(Client) == CLIENT_SERVER))
 604                                         connected = IRC_WriteStrClient(Origin,
 605                                                 ERR_NOPRIVILEGES_MSG,
 606                                                 Client_ID(Origin));
 607                                 else
 608                                         x[0] = 'O';
 609                         } else
 610                                 connected = IRC_WriteStrClient(Origin,
 611                                                 ERR_CHANOPRIVSNEEDED_MSG,
 612                                                 Client_ID(Origin),
 613                                                 Channel_Name(Channel));
 614                                 break;
 615                 case 'P': /* Persistent channel */
 616                         if (modeok) {
 617                                 /* Only IRC operators are allowed to
 618                                  * set the 'P' channel mode! */
 619                                 if (set && !(Client_OperByMe(Client)
 620                                     || Client_Type(Client) == CLIENT_SERVER))
 621                                         connected = IRC_WriteStrClient(Origin,
 622                                                 ERR_NOPRIVILEGES_MSG,
 623                                                 Client_ID(Origin));
 624                                 else
 625                                         x[0] = 'P';
 626                         } else
 627                                 connected = IRC_WriteStrClient(Origin,
 628                                         ERR_CHANOPRIVSNEEDED_MSG,
 629                                         Client_ID(Origin),
 630                                         Channel_Name(Channel));
 631                         break;
 632                 /* --- Channel user modes --- */
 633                 case 'a':
 634                 case 'h':
 635                 case 'q':
 636                         if (Client_Type(Client) != CLIENT_SERVER) {
 637                                 connected = IRC_WriteStrClient(Origin,
 638                                         ERR_CHANOPRIVSNEEDED_MSG,
 639                                         Client_ID(Origin),
 640                                         Channel_Name(Channel));
 641                                 goto chan_exit;
 642                         }
 643                 case 'o': /* Channel operator */
 644                 case 'v': /* Voice */
 645                         if (arg_arg > mode_arg) {
 646                                 if (modeok) {
 647                                         client = Client_Search(Req->argv[arg_arg]);
 648                                         if (client)
 649                                                 x[0] = *mode_ptr;
 650                                         else
 651                                                 connected = IRC_WriteStrClient(Client,
 652                                                         ERR_NOSUCHNICK_MSG,
 653                                                         Client_ID(Client),
 654                                                         Req->argv[arg_arg]);
 655                                 } else {
 656                                         connected = IRC_WriteStrClient(Origin,
 657                                                 ERR_CHANOPRIVSNEEDED_MSG,
 658                                                 Client_ID(Origin),
 659                                                 Channel_Name(Channel));
 660                                 }
 661                                 Req->argv[arg_arg][0] = '\0';
 662                                 arg_arg++;
 663                         } else {
 664                                 connected = IRC_WriteStrClient(Origin,
 665                                         ERR_NEEDMOREPARAMS_MSG,
 666                                         Client_ID(Origin), Req->command);
 667                                 goto chan_exit;
 668                         }
 669                         break;
 670                 /* --- Channel lists --- */
 671                 case 'I': /* Invite lists */
 672                 case 'b': /* Ban lists */
 673                 case 'e': /* Channel exception lists */
 674                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 675                                 goto chan_exit;
 676                         if (arg_arg > mode_arg) {
 677                                 /* modify list */
 678                                 if (modeok) {
 679                                         connected = set
 680                                            ? Add_To_List(*mode_ptr, Origin,
 681                                                 Client, Channel,
 682                                                 Req->argv[arg_arg])
 683                                            : Del_From_List(*mode_ptr, Origin,
 684                                                 Client, Channel,
 685                                                 Req->argv[arg_arg]);
 686                                 } else {
 687                                         connected = IRC_WriteStrClient(Origin,
 688                                                 ERR_CHANOPRIVSNEEDED_MSG,
 689                                                 Client_ID(Origin),
 690                                                 Channel_Name(Channel));
 691                                 }
 692                                 Req->argv[arg_arg][0] = '\0';
 693                                 arg_arg++;
 694                         } else {
 695                                 switch (*mode_ptr) {
 696                                 case 'I':
 697                                         Channel_ShowInvites(Origin, Channel);
 698                                         break;
 699                                 case 'b':
 700                                         Channel_ShowBans(Origin, Channel);
 701                                         break;
 702                                 case 'e':
 703                                         Channel_ShowExcepts(Origin, Channel);
 704                                         break;
 705                                 }
 706                         }
 707                         break;
 708                 default:
 709                         if (Client_Type(Client) != CLIENT_SERVER) {
 710                                 Log(LOG_DEBUG,
 711                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 712                                     set ? '+' : '-', *mode_ptr,
 713                                     Client_ID(Origin), Channel_Name(Channel));
 714                                 connected = IRC_WriteStrClient(Origin,
 715                                         ERR_UNKNOWNMODE_MSG,
 716                                         Client_ID(Origin), *mode_ptr,
 717                                         Channel_Name(Channel));
 718                                 x[0] = '\0';
 719                         } else {
 720                                 Log(LOG_DEBUG,
 721                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 722                                     set ? '+' : '-', *mode_ptr,
 723                                     Client_ID(Origin), Channel_Name(Channel));
 724                                 x[0] = *mode_ptr;
 725                         }
 726                 }
 727
 728                 if (!connected)
 729                         break;
 730
 731                 /* Is there a valid mode change? */
 732                 if (!x[0])
 733                         continue;
 734
 735                 /* Validate target client */
 736                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 737                         if (!IRC_WriteStrClient
 738                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 739                              Client_ID(Origin), Client_ID(client),
 740                              Channel_Name(Channel)))
 741                                 break;
 742
 743                         continue;
 744                 }
 745
 746                 if (client) {
 747                         /* Channel-User-Mode */
 748                         retval = set
 749                                ? Channel_UserModeAdd(Channel, client, x[0])
 750                                : Channel_UserModeDel(Channel, client, x[0]);
 751                         if (retval) {
 752                                 strlcat(the_args, " ", sizeof(the_args));
 753                                 strlcat(the_args, Client_ID(client),
 754                                         sizeof(the_args));
 755                                 strlcat(the_modes, x, sizeof(the_modes));
 756                                 LogDebug
 757                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 758                                      Client_Mask(client), Channel_Name(Channel),
 759                                      Channel_UserModes(Channel, client));
 760                         }
 761                 } else {
 762                         /* Channel-Mode */
 763                         retval = set
 764                                ? Channel_ModeAdd(Channel, x[0])
 765                                : Channel_ModeDel(Channel, x[0]);
 766                         if (retval) {
 767                                 strlcat(the_modes, x, sizeof(the_modes));
 768                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 769                                          Channel_Name(Channel),
 770                                          Channel_Modes(Channel));
 771                         }
 772                 }
 773
 774                 /* Are there additional arguments to add? */
 775                 if (argadd[0]) {
 776                         strlcat(the_args, " ", sizeof(the_args));
 777                         strlcat(the_args, argadd, sizeof(the_args));
 778                 }
 779         }
 780
 781       chan_exit:
 782         /* Are there changed modes? */
 783         if (the_modes[1]) {
 784                 /* Clean up mode string */
 785                 len = strlen(the_modes) - 1;
 786                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 787                         the_modes[len] = '\0';
 788
 789                 if (Client_Type(Client) == CLIENT_SERVER) {
 790                         /* MODE requests for local channels from other servers
 791                          * are definitely invalid! */
 792                         if (Channel_IsLocal(Channel)) {
 793                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 794                                 return CONNECTED;
 795                         }
 796
 797                         /* Forward mode changes to channel users and all the
 798                          * other remote servers: */
 799                         IRC_WriteStrServersPrefix(Client, Origin,
 800                                 "MODE %s %s%s", Channel_Name(Channel),
 801                                 the_modes, the_args);
 802                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 803                                 false, "MODE %s %s%s", Channel_Name(Channel),
 804                                 the_modes, the_args);
 805                 } else {
 806                         if (use_servermode)
 807                                 Origin = Client_ThisServer();
 808                         /* Send reply to client and inform other servers and channel users */
 809                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 810                                         "MODE %s %s%s", Channel_Name(Channel),
 811                                         the_modes, the_args);
 812                         /* Only forward requests for non-local channels */
 813                         if (!Channel_IsLocal(Channel))
 814                                 IRC_WriteStrServersPrefix(Client, Origin,
 815                                         "MODE %s %s%s", Channel_Name(Channel),
 816                                         the_modes, the_args);
 817                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 818                                 false, "MODE %s %s%s", Channel_Name(Channel),
 819                                 the_modes, the_args);
 820                 }
 821         }
 822
 823         IRC_SetPenalty(Client, 1);
 824         return connected;
 825 } /* Channel_Mode */
 826
 827
 828 GLOBAL bool
 829 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 830 {
 831         assert( Client != NULL );
 832         assert( Req != NULL );
 833
 834         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 835
 836         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 837         {
 838                 Client_SetAway( Client, Req->argv[0] );
 839                 Client_ModeAdd( Client, 'a' );
 840                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 841                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 842         }
 843         else
 844         {
 845                 Client_ModeDel( Client, 'a' );
 846                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 847                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 848         }
 849 } /* IRC_AWAY */
 850
 851
 852 /**
 853  * Add entries to channel invite, ban and exception lists.
 854  *
 855  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 856  * @param Prefix The originator of the command.
 857  * @param Client The sender of the command.
 858  * @param Channel The channel of which the list should be modified.
 859  * @param Pattern The pattern to add to the list.
 860  * @return CONNECTED or DISCONNECTED.
 861  */
 862 static bool
 863 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 864             const char *Pattern)
 865 {
 866         const char *mask;
 867         struct list_head *list = NULL;
 868         long int current_count;
 869
 870         assert(Client != NULL);
 871         assert(Channel != NULL);
 872         assert(Pattern != NULL);
 873         assert(what == 'I' || what == 'b' || what == 'e');
 874
 875         mask = Lists_MakeMask(Pattern);
 876         current_count = Lists_Count(Channel_GetListInvites(Channel))
 877                         + Lists_Count(Channel_GetListExcepts(Channel))
 878                         + Lists_Count(Channel_GetListBans(Channel));
 879
 880         switch(what) {
 881                 case 'I':
 882                         list = Channel_GetListInvites(Channel);
 883                         break;
 884                 case 'b':
 885                         list = Channel_GetListBans(Channel);
 886                         break;
 887                 case 'e':
 888                         list = Channel_GetListExcepts(Channel);
 889                         break;
 890         }
 891
 892         if (Lists_CheckDupeMask(list, mask))
 893                 return CONNECTED;
 894         if (Client_Type(Client) == CLIENT_USER &&
 895             current_count >= MAX_HNDL_CHANNEL_LISTS)
 896                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
 897                                           Client_ID(Client),
 898                                           Channel_Name(Channel), mask,
 899                                           MAX_HNDL_CHANNEL_LISTS);
 900
 901         switch (what) {
 902                 case 'I':
 903                         if (!Channel_AddInvite(Channel, mask, false))
 904                                 return CONNECTED;
 905                         break;
 906                 case 'b':
 907                         if (!Channel_AddBan(Channel, mask))
 908                                 return CONNECTED;
 909                         break;
 910                 case 'e':
 911                         if (!Channel_AddExcept(Channel, mask))
 912                                 return CONNECTED;
 913                         break;
 914         }
 915         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
 916 }
 917
 918
 919 /**
 920  * Delete entries from channel invite, ban and exeption lists.
 921  *
 922  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 923  * @param Prefix The originator of the command.
 924  * @param Client The sender of the command.
 925  * @param Channel The channel of which the list should be modified.
 926  * @param Pattern The pattern to add to the list.
 927  * @return CONNECTED or DISCONNECTED.
 928  */
 929 static bool
 930 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 931               const char *Pattern)
 932 {
 933         const char *mask;
 934         struct list_head *list = NULL;
 935
 936         assert(Client != NULL);
 937         assert(Channel != NULL);
 938         assert(Pattern != NULL);
 939         assert(what == 'I' || what == 'b' || what == 'e');
 940
 941         mask = Lists_MakeMask(Pattern);
 942
 943         switch (what) {
 944                 case 'I':
 945                         list = Channel_GetListInvites(Channel);
 946                         break;
 947                 case 'b':
 948                         list = Channel_GetListBans(Channel);
 949                         break;
 950                 case 'e':
 951                         list = Channel_GetListExcepts(Channel);
 952                         break;
 953         }
 954
 955         if (!Lists_CheckDupeMask(list, mask))
 956                 return CONNECTED;
 957         Lists_Del(list, mask);
 958
 959         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
 960 }
 961
 962
 963 /**
 964  * Send information about changed channel invite/ban/exception lists to clients.
 965  *
 966  * @param IsAdd true if the list item has been added, false otherwise.
 967  * @param ModeChar The mode to use (e. g. 'b' or 'I')
 968  * @param Prefix The originator of the mode list change.
 969  * @param Client The sender of the command.
 970  * @param Channel The channel of which the list has been modified.
 971  * @param Mask The mask which has been added or removed.
 972  * @return CONNECTED or DISCONNECTED.
 973  */
 974 static bool
 975 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
 976                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
 977 {
 978         bool ok = true;
 979
 980         /* Send confirmation to the client */
 981         if (Client_Type(Client) == CLIENT_USER)
 982                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
 983                                               Channel_Name(Channel),
 984                                               IsAdd ? '+' : '-',
 985                                               ModeChar, Mask);
 986
 987         /* to other servers */
 988         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
 989                                   Channel_Name(Channel), IsAdd ? '+' : '-',
 990                                   ModeChar, Mask);
 991
 992         /* and local users in channel */
 993         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
 994                                   "MODE %s %c%c %s", Channel_Name(Channel),
 995                                   IsAdd ? '+' : '-', ModeChar, Mask );
 996
 997         return ok;
 998 } /* Send_ListChange */
 999
1000
1001 /* -eof- */