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 'R': /* Registered (not [un]settable by clients) */
 268                         if (Client_Type(Client) == CLIENT_SERVER)
 269                                 x[0] = 'R';
 270                         else
 271                                 ok = IRC_WriteStrClient(Origin,
 272                                                         ERR_NICKREGISTER_MSG,
 273                                                         Client_ID(Origin));
 274                         break;
 275                 case 'x': /* Cloak hostname */
 276                         if (Client_HasMode(Client, 'r'))
 277                                 ok = IRC_WriteStrClient(Origin,
 278                                                         ERR_RESTRICTED_MSG,
 279                                                         Client_ID(Origin));
 280                         else
 281                                 x[0] = 'x';
 282                         break;
 283                 default:
 284                         if (Client_Type(Client) != CLIENT_SERVER) {
 285                                 Log(LOG_DEBUG,
 286                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 287                                     set ? '+' : '-', *mode_ptr,
 288                                     Client_ID(Origin));
 289                                 ok = IRC_WriteStrClient(Origin,
 290                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 291                                                         Client_ID(Origin),
 292                                                         set ? '+' : '-',
 293                                                         *mode_ptr);
 294                                 x[0] = '\0';
 295                         } else {
 296                                 Log(LOG_DEBUG,
 297                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 298                                     set ? '+' : '-', *mode_ptr,
 299                                     Client_ID(Origin), Client_ID(Target));
 300                                 x[0] = *mode_ptr;
 301                         }
 302                 }
 303
 304                 if (!ok)
 305                         break;
 306
 307                 /* Is there a valid mode change? */
 308                 if (!x[0])
 309                         continue;
 310
 311                 if (set) {
 312                         if (Client_ModeAdd(Target, x[0]))
 313                                 strlcat(the_modes, x, sizeof(the_modes));
 314                 } else {
 315                         if (Client_ModeDel(Target, x[0]))
 316                                 strlcat(the_modes, x, sizeof(the_modes));
 317                 }
 318         }
 319
 320         /* Are there changed modes? */
 321         if (the_modes[1]) {
 322                 /* Remove needless action modifier characters */
 323                 len = strlen(the_modes) - 1;
 324                 if (the_modes[len] == '+' || the_modes[len] == '-')
 325                         the_modes[len] = '\0';
 326
 327                 if (Client_Type(Client) == CLIENT_SERVER) {
 328                         /* Forward modes to other servers */
 329                         if (Client_Conn(Target) != NONE) {
 330                                 /* Remote server (service?) changed modes
 331                                  * for one of our clients. Inform it! */
 332                                 IRC_WriteStrClientPrefix(Target, Origin,
 333                                                          "MODE %s :%s",
 334                                                          Client_ID(Target),
 335                                                          the_modes);
 336                         }
 337                         IRC_WriteStrServersPrefix(Client, Origin,
 338                                                   "MODE %s :%s",
 339                                                   Client_ID(Target),
 340                                                   the_modes);
 341                 } else {
 342                         /* Send reply to client and inform other servers */
 343                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 344                                                       "MODE %s :%s",
 345                                                       Client_ID(Target),
 346                                                       the_modes);
 347                         IRC_WriteStrServersPrefix(Client, Origin,
 348                                                   "MODE %s :%s",
 349                                                   Client_ID(Target),
 350                                                   the_modes);
 351                 }
 352                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 353                          Client_TypeText(Target), Client_Mask(Target),
 354                          Client_Modes(Target));
 355         }
 356
 357         IRC_SetPenalty(Client, 1);
 358         return ok;
 359 } /* Client_Mode */
 360
 361
 362 static bool
 363 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 364 {
 365         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 366         const char *mode_ptr;
 367
 368         /* Member or not? -- That's the question! */
 369         if (!Channel_IsMemberOf(Channel, Origin))
 370                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 371                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 372
 373         /* The sender is a member: generate extended reply */
 374         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 375         mode_ptr = the_modes;
 376         the_args[0] = '\0';
 377
 378         while(*mode_ptr) {
 379                 switch(*mode_ptr) {
 380                 case 'l':
 381                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 382                         strlcat(the_args, argadd, sizeof(the_args));
 383                         break;
 384                 case 'k':
 385                         strlcat(the_args, " ", sizeof(the_args));
 386                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 387                         break;
 388                 }
 389                 mode_ptr++;
 390         }
 391         if (the_args[0])
 392                 strlcat(the_modes, the_args, sizeof(the_modes));
 393
 394         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 395                                 Client_ID(Origin), Channel_Name(Channel),
 396                                 the_modes))
 397                 return DISCONNECTED;
 398 #ifndef STRICT_RFC
 399         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 400                                   Client_ID(Origin), Channel_Name(Channel),
 401                                   Channel_CreationTime(Channel)))
 402                 return DISCONNECTED;
 403 #endif
 404         return CONNECTED;
 405 }
 406
 407
 408 /**
 409  * Handle channel mode and channel-user mode changes
 410  */
 411 static bool
 412 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 413 {
 414         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 415             argadd[CLIENT_PASS_LEN], *mode_ptr;
 416         bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
 417         int mode_arg, arg_arg, mode_arg_count = 0;
 418         CLIENT *client;
 419         long l;
 420         size_t len;
 421
 422         if (Channel_IsModeless(Channel))
 423                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 424                                 Client_ID(Client), Channel_Name(Channel));
 425
 426         /* Mode request: let's answer it :-) */
 427         if (Req->argc <= 1)
 428                 return Channel_Mode_Answer_Request(Origin, Channel);
 429
 430         Channel_CheckAdminRights(Channel, Client, Origin,
 431                                  &onchannel, &modeok, &use_servermode);
 432
 433         if (!onchannel && !modeok)
 434                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 435                                           Client_ID(Origin),
 436                                           Channel_Name(Channel));
 437
 438         mode_arg = 1;
 439         mode_ptr = Req->argv[mode_arg];
 440         if (Req->argc > mode_arg + 1)
 441                 arg_arg = mode_arg + 1;
 442         else
 443                 arg_arg = -1;
 444
 445         /* Initial state: set or unset modes? */
 446         skiponce = false;
 447         switch (*mode_ptr) {
 448         case '-':
 449                 set = false;
 450                 break;
 451         case '+':
 452                 set = true;
 453                 break;
 454         default:
 455                 set = true;
 456                 skiponce = true;
 457         }
 458
 459         /* Prepare reply string */
 460         strcpy(the_modes, set ? "+" : "-");
 461         the_args[0] = '\0';
 462
 463         x[1] = '\0';
 464         connected = CONNECTED;
 465         while (mode_ptr) {
 466                 if (!skiponce)
 467                         mode_ptr++;
 468                 if (!*mode_ptr) {
 469                         /* Try next argument if there's any */
 470                         if (arg_arg < 0)
 471                                 break;
 472                         if (arg_arg > mode_arg)
 473                                 mode_arg = arg_arg;
 474                         else
 475                                 mode_arg++;
 476
 477                         if (mode_arg >= Req->argc)
 478                                 break;
 479                         mode_ptr = Req->argv[mode_arg];
 480
 481                         if (Req->argc > mode_arg + 1)
 482                                 arg_arg = mode_arg + 1;
 483                         else
 484                                 arg_arg = -1;
 485                 }
 486                 skiponce = false;
 487
 488                 switch (*mode_ptr) {
 489                 case '+':
 490                 case '-':
 491                         if (((*mode_ptr == '+') && !set)
 492                             || ((*mode_ptr == '-') && set)) {
 493                                 /* Action modifier ("+"/"-") must be changed ... */
 494                                 len = strlen(the_modes) - 1;
 495                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 496                                         /* Adjust last action modifier in result */
 497                                         the_modes[len] = *mode_ptr;
 498                                 } else {
 499                                         /* Append modifier character to result string */
 500                                         x[0] = *mode_ptr;
 501                                         strlcat(the_modes, x, sizeof(the_modes));
 502                                 }
 503                                 set = *mode_ptr == '+';
 504                         }
 505                         continue;
 506                 }
 507
 508                 /* Are there arguments left? */
 509                 if (arg_arg >= Req->argc)
 510                         arg_arg = -1;
 511
 512                 /* Validate modes */
 513                 x[0] = '\0';
 514                 argadd[0] = '\0';
 515                 client = NULL;
 516                 switch (*mode_ptr) {
 517                 /* --- Channel modes --- */
 518                 case 'i': /* Invite only */
 519                 case 'M': /* Only identified nicks can write */
 520                 case 'm': /* Moderated */
 521                 case 'n': /* Only members can write */
 522                 case 'R': /* Registered users only */
 523                 case 's': /* Secret channel */
 524                 case 't': /* Topic locked */
 525                 case 'z': /* Secure connections only */
 526                         if (modeok)
 527                                 x[0] = *mode_ptr;
 528                         else
 529                                 connected = IRC_WriteStrClient(Origin,
 530                                         ERR_CHANOPRIVSNEEDED_MSG,
 531                                         Client_ID(Origin), Channel_Name(Channel));
 532                         break;
 533                 case 'k': /* Channel key */
 534                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 535                                 goto chan_exit;
 536                         if (!set) {
 537                                 if (modeok)
 538                                         x[0] = *mode_ptr;
 539                                 else
 540                                         connected = IRC_WriteStrClient(Origin,
 541                                                 ERR_CHANOPRIVSNEEDED_MSG,
 542                                                 Client_ID(Origin),
 543                                                 Channel_Name(Channel));
 544                                 break;
 545                         }
 546                         if (arg_arg > mode_arg) {
 547                                 if (modeok) {
 548                                         Channel_ModeDel(Channel, 'k');
 549                                         Channel_SetKey(Channel,
 550                                                        Req->argv[arg_arg]);
 551                                         strlcpy(argadd, Channel_Key(Channel),
 552                                                 sizeof(argadd));
 553                                         x[0] = *mode_ptr;
 554                                 } else {
 555                                         connected = IRC_WriteStrClient(Origin,
 556                                                 ERR_CHANOPRIVSNEEDED_MSG,
 557                                                 Client_ID(Origin),
 558                                                 Channel_Name(Channel));
 559                                 }
 560                                 Req->argv[arg_arg][0] = '\0';
 561                                 arg_arg++;
 562                         } else {
 563                                 connected = IRC_WriteStrClient(Origin,
 564                                         ERR_NEEDMOREPARAMS_MSG,
 565                                         Client_ID(Origin), Req->command);
 566                                 goto chan_exit;
 567                         }
 568                         break;
 569                 case 'l': /* Member limit */
 570                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 571                                 goto chan_exit;
 572                         if (!set) {
 573                                 if (modeok)
 574                                         x[0] = *mode_ptr;
 575                                 else
 576                                         connected = IRC_WriteStrClient(Origin,
 577                                                 ERR_CHANOPRIVSNEEDED_MSG,
 578                                                 Client_ID(Origin),
 579                                                 Channel_Name(Channel));
 580                                 break;
 581                         }
 582                         if (arg_arg > mode_arg) {
 583                                 if (modeok) {
 584                                         l = atol(Req->argv[arg_arg]);
 585                                         if (l > 0 && l < 0xFFFF) {
 586                                                 Channel_ModeDel(Channel, 'l');
 587                                                 Channel_SetMaxUsers(Channel, l);
 588                                                 snprintf(argadd, sizeof(argadd),
 589                                                          "%ld", l);
 590                                                 x[0] = *mode_ptr;
 591                                         }
 592                                 } else {
 593                                         connected = IRC_WriteStrClient(Origin,
 594                                                 ERR_CHANOPRIVSNEEDED_MSG,
 595                                                 Client_ID(Origin),
 596                                                 Channel_Name(Channel));
 597                                 }
 598                                 Req->argv[arg_arg][0] = '\0';
 599                                 arg_arg++;
 600                         } else {
 601                                 connected = IRC_WriteStrClient(Origin,
 602                                         ERR_NEEDMOREPARAMS_MSG,
 603                                         Client_ID(Origin), Req->command);
 604                                 goto chan_exit;
 605                         }
 606                         break;
 607                 case 'O': /* IRC operators only */
 608                         if (modeok) {
 609                                 /* Only IRC operators are allowed to
 610                                  * set the 'O' channel mode! */
 611                                 if (set && !(Client_OperByMe(Client)
 612                                     || Client_Type(Client) == CLIENT_SERVER))
 613                                         connected = IRC_WriteStrClient(Origin,
 614                                                 ERR_NOPRIVILEGES_MSG,
 615                                                 Client_ID(Origin));
 616                                 else
 617                                         x[0] = 'O';
 618                         } else
 619                                 connected = IRC_WriteStrClient(Origin,
 620                                                 ERR_CHANOPRIVSNEEDED_MSG,
 621                                                 Client_ID(Origin),
 622                                                 Channel_Name(Channel));
 623                                 break;
 624                 case 'P': /* Persistent channel */
 625                         if (modeok) {
 626                                 /* Only IRC operators are allowed to
 627                                  * set the 'P' channel mode! */
 628                                 if (set && !(Client_OperByMe(Client)
 629                                     || Client_Type(Client) == CLIENT_SERVER))
 630                                         connected = IRC_WriteStrClient(Origin,
 631                                                 ERR_NOPRIVILEGES_MSG,
 632                                                 Client_ID(Origin));
 633                                 else
 634                                         x[0] = 'P';
 635                         } else
 636                                 connected = IRC_WriteStrClient(Origin,
 637                                         ERR_CHANOPRIVSNEEDED_MSG,
 638                                         Client_ID(Origin),
 639                                         Channel_Name(Channel));
 640                         break;
 641                 /* --- Channel user modes --- */
 642                 case 'a':
 643                 case 'h':
 644                 case 'q':
 645                         if (Client_Type(Client) != CLIENT_SERVER) {
 646                                 connected = IRC_WriteStrClient(Origin,
 647                                         ERR_CHANOPRIVSNEEDED_MSG,
 648                                         Client_ID(Origin),
 649                                         Channel_Name(Channel));
 650                                 goto chan_exit;
 651                         }
 652                 case 'o': /* Channel operator */
 653                 case 'v': /* Voice */
 654                         if (arg_arg > mode_arg) {
 655                                 if (modeok) {
 656                                         client = Client_Search(Req->argv[arg_arg]);
 657                                         if (client)
 658                                                 x[0] = *mode_ptr;
 659                                         else
 660                                                 connected = IRC_WriteStrClient(Client,
 661                                                         ERR_NOSUCHNICK_MSG,
 662                                                         Client_ID(Client),
 663                                                         Req->argv[arg_arg]);
 664                                 } else {
 665                                         connected = IRC_WriteStrClient(Origin,
 666                                                 ERR_CHANOPRIVSNEEDED_MSG,
 667                                                 Client_ID(Origin),
 668                                                 Channel_Name(Channel));
 669                                 }
 670                                 Req->argv[arg_arg][0] = '\0';
 671                                 arg_arg++;
 672                         } else {
 673                                 connected = IRC_WriteStrClient(Origin,
 674                                         ERR_NEEDMOREPARAMS_MSG,
 675                                         Client_ID(Origin), Req->command);
 676                                 goto chan_exit;
 677                         }
 678                         break;
 679                 /* --- Channel lists --- */
 680                 case 'I': /* Invite lists */
 681                 case 'b': /* Ban lists */
 682                 case 'e': /* Channel exception lists */
 683                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 684                                 goto chan_exit;
 685                         if (arg_arg > mode_arg) {
 686                                 /* modify list */
 687                                 if (modeok) {
 688                                         connected = set
 689                                            ? Add_To_List(*mode_ptr, Origin,
 690                                                 Client, Channel,
 691                                                 Req->argv[arg_arg])
 692                                            : Del_From_List(*mode_ptr, Origin,
 693                                                 Client, Channel,
 694                                                 Req->argv[arg_arg]);
 695                                 } else {
 696                                         connected = IRC_WriteStrClient(Origin,
 697                                                 ERR_CHANOPRIVSNEEDED_MSG,
 698                                                 Client_ID(Origin),
 699                                                 Channel_Name(Channel));
 700                                 }
 701                                 Req->argv[arg_arg][0] = '\0';
 702                                 arg_arg++;
 703                         } else {
 704                                 switch (*mode_ptr) {
 705                                 case 'I':
 706                                         Channel_ShowInvites(Origin, Channel);
 707                                         break;
 708                                 case 'b':
 709                                         Channel_ShowBans(Origin, Channel);
 710                                         break;
 711                                 case 'e':
 712                                         Channel_ShowExcepts(Origin, Channel);
 713                                         break;
 714                                 }
 715                         }
 716                         break;
 717                 default:
 718                         if (Client_Type(Client) != CLIENT_SERVER) {
 719                                 Log(LOG_DEBUG,
 720                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 721                                     set ? '+' : '-', *mode_ptr,
 722                                     Client_ID(Origin), Channel_Name(Channel));
 723                                 connected = IRC_WriteStrClient(Origin,
 724                                         ERR_UNKNOWNMODE_MSG,
 725                                         Client_ID(Origin), *mode_ptr,
 726                                         Channel_Name(Channel));
 727                                 x[0] = '\0';
 728                         } else {
 729                                 Log(LOG_DEBUG,
 730                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 731                                     set ? '+' : '-', *mode_ptr,
 732                                     Client_ID(Origin), Channel_Name(Channel));
 733                                 x[0] = *mode_ptr;
 734                         }
 735                 }
 736
 737                 if (!connected)
 738                         break;
 739
 740                 /* Is there a valid mode change? */
 741                 if (!x[0])
 742                         continue;
 743
 744                 /* Validate target client */
 745                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 746                         if (!IRC_WriteStrClient
 747                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 748                              Client_ID(Origin), Client_ID(client),
 749                              Channel_Name(Channel)))
 750                                 break;
 751
 752                         continue;
 753                 }
 754
 755                 if (client) {
 756                         /* Channel-User-Mode */
 757                         retval = set
 758                                ? Channel_UserModeAdd(Channel, client, x[0])
 759                                : Channel_UserModeDel(Channel, client, x[0]);
 760                         if (retval) {
 761                                 strlcat(the_args, " ", sizeof(the_args));
 762                                 strlcat(the_args, Client_ID(client),
 763                                         sizeof(the_args));
 764                                 strlcat(the_modes, x, sizeof(the_modes));
 765                                 LogDebug
 766                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 767                                      Client_Mask(client), Channel_Name(Channel),
 768                                      Channel_UserModes(Channel, client));
 769                         }
 770                 } else {
 771                         /* Channel-Mode */
 772                         retval = set
 773                                ? Channel_ModeAdd(Channel, x[0])
 774                                : Channel_ModeDel(Channel, x[0]);
 775                         if (retval) {
 776                                 strlcat(the_modes, x, sizeof(the_modes));
 777                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 778                                          Channel_Name(Channel),
 779                                          Channel_Modes(Channel));
 780                         }
 781                 }
 782
 783                 /* Are there additional arguments to add? */
 784                 if (argadd[0]) {
 785                         strlcat(the_args, " ", sizeof(the_args));
 786                         strlcat(the_args, argadd, sizeof(the_args));
 787                 }
 788         }
 789
 790       chan_exit:
 791         /* Are there changed modes? */
 792         if (the_modes[1]) {
 793                 /* Clean up mode string */
 794                 len = strlen(the_modes) - 1;
 795                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 796                         the_modes[len] = '\0';
 797
 798                 if (Client_Type(Client) == CLIENT_SERVER) {
 799                         /* MODE requests for local channels from other servers
 800                          * are definitely invalid! */
 801                         if (Channel_IsLocal(Channel)) {
 802                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 803                                 return CONNECTED;
 804                         }
 805
 806                         /* Forward mode changes to channel users and all the
 807                          * other remote servers: */
 808                         IRC_WriteStrServersPrefix(Client, Origin,
 809                                 "MODE %s %s%s", Channel_Name(Channel),
 810                                 the_modes, the_args);
 811                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 812                                 false, "MODE %s %s%s", Channel_Name(Channel),
 813                                 the_modes, the_args);
 814                 } else {
 815                         if (use_servermode)
 816                                 Origin = Client_ThisServer();
 817                         /* Send reply to client and inform other servers and channel users */
 818                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 819                                         "MODE %s %s%s", Channel_Name(Channel),
 820                                         the_modes, the_args);
 821                         /* Only forward requests for non-local channels */
 822                         if (!Channel_IsLocal(Channel))
 823                                 IRC_WriteStrServersPrefix(Client, Origin,
 824                                         "MODE %s %s%s", Channel_Name(Channel),
 825                                         the_modes, the_args);
 826                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 827                                 false, "MODE %s %s%s", Channel_Name(Channel),
 828                                 the_modes, the_args);
 829                 }
 830         }
 831
 832         IRC_SetPenalty(Client, 1);
 833         return connected;
 834 } /* Channel_Mode */
 835
 836
 837 GLOBAL bool
 838 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 839 {
 840         assert( Client != NULL );
 841         assert( Req != NULL );
 842
 843         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 844
 845         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 846         {
 847                 Client_SetAway( Client, Req->argv[0] );
 848                 Client_ModeAdd( Client, 'a' );
 849                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 850                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 851         }
 852         else
 853         {
 854                 Client_ModeDel( Client, 'a' );
 855                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 856                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 857         }
 858 } /* IRC_AWAY */
 859
 860
 861 /**
 862  * Add entries to channel invite, ban and exception lists.
 863  *
 864  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 865  * @param Prefix The originator of the command.
 866  * @param Client The sender of the command.
 867  * @param Channel The channel of which the list should be modified.
 868  * @param Pattern The pattern to add to the list.
 869  * @return CONNECTED or DISCONNECTED.
 870  */
 871 static bool
 872 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 873             const char *Pattern)
 874 {
 875         const char *mask;
 876         struct list_head *list = NULL;
 877         long int current_count;
 878
 879         assert(Client != NULL);
 880         assert(Channel != NULL);
 881         assert(Pattern != NULL);
 882         assert(what == 'I' || what == 'b' || what == 'e');
 883
 884         mask = Lists_MakeMask(Pattern);
 885         current_count = Lists_Count(Channel_GetListInvites(Channel))
 886                         + Lists_Count(Channel_GetListExcepts(Channel))
 887                         + Lists_Count(Channel_GetListBans(Channel));
 888
 889         switch(what) {
 890                 case 'I':
 891                         list = Channel_GetListInvites(Channel);
 892                         break;
 893                 case 'b':
 894                         list = Channel_GetListBans(Channel);
 895                         break;
 896                 case 'e':
 897                         list = Channel_GetListExcepts(Channel);
 898                         break;
 899         }
 900
 901         if (Lists_CheckDupeMask(list, mask))
 902                 return CONNECTED;
 903         if (Client_Type(Client) == CLIENT_USER &&
 904             current_count >= MAX_HNDL_CHANNEL_LISTS)
 905                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
 906                                           Client_ID(Client),
 907                                           Channel_Name(Channel), mask,
 908                                           MAX_HNDL_CHANNEL_LISTS);
 909
 910         switch (what) {
 911                 case 'I':
 912                         if (!Channel_AddInvite(Channel, mask, false))
 913                                 return CONNECTED;
 914                         break;
 915                 case 'b':
 916                         if (!Channel_AddBan(Channel, mask))
 917                                 return CONNECTED;
 918                         break;
 919                 case 'e':
 920                         if (!Channel_AddExcept(Channel, mask))
 921                                 return CONNECTED;
 922                         break;
 923         }
 924         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
 925 }
 926
 927
 928 /**
 929  * Delete entries from channel invite, ban and exeption lists.
 930  *
 931  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 932  * @param Prefix The originator of the command.
 933  * @param Client The sender of the command.
 934  * @param Channel The channel of which the list should be modified.
 935  * @param Pattern The pattern to add to the list.
 936  * @return CONNECTED or DISCONNECTED.
 937  */
 938 static bool
 939 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 940               const char *Pattern)
 941 {
 942         const char *mask;
 943         struct list_head *list = NULL;
 944
 945         assert(Client != NULL);
 946         assert(Channel != NULL);
 947         assert(Pattern != NULL);
 948         assert(what == 'I' || what == 'b' || what == 'e');
 949
 950         mask = Lists_MakeMask(Pattern);
 951
 952         switch (what) {
 953                 case 'I':
 954                         list = Channel_GetListInvites(Channel);
 955                         break;
 956                 case 'b':
 957                         list = Channel_GetListBans(Channel);
 958                         break;
 959                 case 'e':
 960                         list = Channel_GetListExcepts(Channel);
 961                         break;
 962         }
 963
 964         if (!Lists_CheckDupeMask(list, mask))
 965                 return CONNECTED;
 966         Lists_Del(list, mask);
 967
 968         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
 969 }
 970
 971
 972 /**
 973  * Send information about changed channel invite/ban/exception lists to clients.
 974  *
 975  * @param IsAdd true if the list item has been added, false otherwise.
 976  * @param ModeChar The mode to use (e. g. 'b' or 'I')
 977  * @param Prefix The originator of the mode list change.
 978  * @param Client The sender of the command.
 979  * @param Channel The channel of which the list has been modified.
 980  * @param Mask The mask which has been added or removed.
 981  * @return CONNECTED or DISCONNECTED.
 982  */
 983 static bool
 984 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
 985                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
 986 {
 987         bool ok = true;
 988
 989         /* Send confirmation to the client */
 990         if (Client_Type(Client) == CLIENT_USER)
 991                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
 992                                               Channel_Name(Channel),
 993                                               IsAdd ? '+' : '-',
 994                                               ModeChar, Mask);
 995
 996         /* to other servers */
 997         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
 998                                   Channel_Name(Channel), IsAdd ? '+' : '-',
 999                                   ModeChar, Mask);
1000
1001         /* and local users in channel */
1002         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1003                                   "MODE %s %c%c %s", Channel_Name(Channel),
1004                                   IsAdd ? '+' : '-', ModeChar, Mask );
1005
1006         return ok;
1007 } /* Send_ListChange */
1008
1009
1010 /* -eof- */