src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-write.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "parse.h"
  32 #include "messages.h"
  33 #include "conf.h"
  34
  35 #include "exp.h"
  36 #include "irc-mode.h"
  37
  38
  39 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  40                                 CLIENT *Target));
  41 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42                                  CHANNEL *Channel));
  43
  44 static bool Add_Ban_Invite PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  45                                    CHANNEL *Channel, const char *Pattern));
  46 static bool Del_Ban_Invite PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  47                                    CHANNEL *Channel, const char *Pattern));
  48
  49 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  50                                     CLIENT *Prefix, CLIENT *Client,
  51                                     CHANNEL *Channel, const char *Mask));
  52
  53
  54 /**
  55  * Handler for the IRC "MODE" command.
  56  *
  57  * See RFC 2812 section 3.1.5 ("user mode message") and section 3.2.3
  58  * ("channel mode message"), and RFC 2811 section 4 ("channel modes").
  59  *
  60  * @param Client        The client from which this command has been received.
  61  * @param Req           Request structure with prefix and all parameters.
  62  * @returns             CONNECTED or DISCONNECTED.
  63  */
  64 GLOBAL bool
  65 IRC_MODE( CLIENT *Client, REQUEST *Req )
  66 {
  67         CLIENT *cl, *origin;
  68         CHANNEL *chan;
  69
  70         assert(Client != NULL);
  71         assert(Req != NULL);
  72
  73         /* No parameters? */
  74         if (Req->argc < 1)
  75                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  76                                           Client_ID(Client), Req->command);
  77
  78         /* Origin for answers */
  79         if (Client_Type(Client) == CLIENT_SERVER) {
  80                 origin = Client_Search(Req->prefix);
  81                 if (!origin)
  82                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  83                                                   Client_ID(Client),
  84                                                   Req->prefix);
  85         } else
  86                 origin = Client;
  87
  88         /* Channel or user mode? */
  89         cl = NULL; chan = NULL;
  90         if (Client_IsValidNick(Req->argv[0]))
  91                 cl = Client_Search(Req->argv[0]);
  92         if (Channel_IsValidName(Req->argv[0]))
  93                 chan = Channel_Search(Req->argv[0]);
  94
  95         if (cl)
  96                 return Client_Mode(Client, Req, origin, cl);
  97         if (chan)
  98                 return Channel_Mode(Client, Req, origin, chan);
  99
 100         /* No target found! */
 101         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 102                         Client_ID(Client), Req->argv[0]);
 103 } /* IRC_MODE */
 104
 105
 106 /**
 107  * Check if the "mode limit" for a client has been reached.
 108  *
 109  * This limit doesn't apply for servers or services!
 110  *
 111  * @param Client The client to check.
 112  * @param Count The number of modes already handled.
 113  * @return true if the limit has been reached.
 114  */
 115 static bool
 116 Mode_Limit_Reached(CLIENT *Client, int Count)
 117 {
 118         if (Client_Type(Client) == CLIENT_SERVER
 119             || Client_Type(Client) == CLIENT_SERVICE)
 120                 return false;
 121         if (Count < MAX_HNDL_MODES_ARG)
 122                 return false;
 123         return true;
 124 }
 125
 126
 127 /**
 128  * Handle client mode requests
 129  *
 130  * @param Client        The client from which this command has been received.
 131  * @param Req           Request structure with prefix and all parameters.
 132  * @param Origin        The originator of the MODE command (prefix).
 133  * @param Target        The target (client) of this MODE command.
 134  * @returns             CONNECTED or DISCONNECTED.
 135  */
 136 static bool
 137 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 138 {
 139         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 140         bool ok, set;
 141         int mode_arg;
 142         size_t len;
 143
 144         /* Is the client allowed to request or change the modes? */
 145         if (Client_Type(Client) == CLIENT_USER) {
 146                 /* Users are only allowed to manipulate their own modes! */
 147                 if (Target != Client)
 148                         return IRC_WriteStrClient(Client,
 149                                                   ERR_USERSDONTMATCH_MSG,
 150                                                   Client_ID(Client));
 151         }
 152
 153         /* Mode request: let's answer it :-) */
 154         if (Req->argc == 1)
 155                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 156                                           Client_ID(Origin),
 157                                           Client_Modes(Target));
 158
 159         mode_arg = 1;
 160         mode_ptr = Req->argv[mode_arg];
 161
 162         /* Initial state: set or unset modes? */
 163         if (*mode_ptr == '+') {
 164                 set = true;
 165                 strcpy(the_modes, "+");
 166         } else if (*mode_ptr == '-') {
 167                 set = false;
 168                 strcpy(the_modes, "-");
 169         } else
 170                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 171                                           Client_ID(Origin));
 172
 173         x[1] = '\0';
 174         ok = CONNECTED;
 175         while (mode_ptr) {
 176                 mode_ptr++;
 177                 if (!*mode_ptr) {
 178                         /* Try next argument if there's any */
 179                         mode_arg++;
 180                         if (mode_arg < Req->argc)
 181                                 mode_ptr = Req->argv[mode_arg];
 182                         else
 183                                 break;
 184                 }
 185
 186                 switch(*mode_ptr) {
 187                   case '+':
 188                   case '-':
 189                         if ((*mode_ptr == '+' && !set)
 190                             || (*mode_ptr == '-' && set)) {
 191                                 /* Action modifier ("+"/"-") must be changed */
 192                                 len = strlen(the_modes) - 1;
 193                                 if (the_modes[len] == '+'
 194                                     || the_modes[len] == '-') {
 195                                         /* Last character in the "result
 196                                          * string" was an "action", so just
 197                                          * overwrite it with the new action */
 198                                         the_modes[len] = *mode_ptr;
 199                                 } else {
 200                                         /* Append new modifier character to
 201                                          * the resulting mode string */
 202                                         x[0] = *mode_ptr;
 203                                         strlcat(the_modes, x,
 204                                                 sizeof(the_modes));
 205                                 }
 206                                 if (*mode_ptr == '+')
 207                                         set = true;
 208                                 else
 209                                         set = false;
 210                         }
 211                         continue;
 212                 }
 213
 214                 /* Validate modes */
 215                 x[0] = '\0';
 216                 switch (*mode_ptr) {
 217                 case 'C': /* Only messages from clients sharing a channel */
 218                 case 'i': /* Invisible */
 219                 case 's': /* Server messages */
 220                 case 'w': /* Wallops messages */
 221                         x[0] = *mode_ptr;
 222                         break;
 223                 case 'a': /* Away */
 224                         if (Client_Type(Client) == CLIENT_SERVER) {
 225                                 x[0] = 'a';
 226                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 227                         } else
 228                                 ok = IRC_WriteStrClient(Origin,
 229                                                         ERR_NOPRIVILEGES_MSG,
 230                                                         Client_ID(Origin));
 231                         break;
 232                 case 'c': /* Receive connect notices
 233                            * (only settable by IRC operators!) */
 234                         if (!set || Client_Type(Client) == CLIENT_SERVER
 235                             || Client_OperByMe(Origin))
 236                                 x[0] = 'c';
 237                         else
 238                                 ok = IRC_WriteStrClient(Origin,
 239                                                         ERR_NOPRIVILEGES_MSG,
 240                                                         Client_ID(Origin));
 241                         break;
 242                 case 'o': /* IRC operator (only unsettable!) */
 243                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 244                                 Client_SetOperByMe(Target, false);
 245                                 x[0] = 'o';
 246                         } else
 247                                 ok = IRC_WriteStrClient(Origin,
 248                                                         ERR_NOPRIVILEGES_MSG,
 249                                                         Client_ID(Origin));
 250                         break;
 251                 case 'r': /* Restricted (only settable) */
 252                         if (set || Client_Type(Client) == CLIENT_SERVER)
 253                                 x[0] = 'r';
 254                         else
 255                                 ok = IRC_WriteStrClient(Origin,
 256                                                         ERR_RESTRICTED_MSG,
 257                                                         Client_ID(Origin));
 258                         break;
 259                 case 'x': /* Cloak hostname */
 260                         if (Client_HasMode(Client, 'r'))
 261                                 ok = IRC_WriteStrClient(Origin,
 262                                                         ERR_RESTRICTED_MSG,
 263                                                         Client_ID(Origin));
 264                         else
 265                                 x[0] = 'x';
 266                         break;
 267                 default:
 268                         if (Client_Type(Client) != CLIENT_SERVER) {
 269                                 Log(LOG_DEBUG,
 270                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 271                                     set ? '+' : '-', *mode_ptr,
 272                                     Client_ID(Origin));
 273                                 ok = IRC_WriteStrClient(Origin,
 274                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 275                                                         Client_ID(Origin),
 276                                                         set ? '+' : '-',
 277                                                         *mode_ptr);
 278                                 x[0] = '\0';
 279                         } else {
 280                                 Log(LOG_DEBUG,
 281                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 282                                     set ? '+' : '-', *mode_ptr,
 283                                     Client_ID(Origin), Client_ID(Target));
 284                                 x[0] = *mode_ptr;
 285                         }
 286                 }
 287
 288                 if (!ok)
 289                         break;
 290
 291                 /* Is there a valid mode change? */
 292                 if (!x[0])
 293                         continue;
 294
 295                 if (set) {
 296                         if (Client_ModeAdd(Target, x[0]))
 297                                 strlcat(the_modes, x, sizeof(the_modes));
 298                 } else {
 299                         if (Client_ModeDel(Target, x[0]))
 300                                 strlcat(the_modes, x, sizeof(the_modes));
 301                 }
 302         }
 303
 304         /* Are there changed modes? */
 305         if (the_modes[1]) {
 306                 /* Remove needless action modifier characters */
 307                 len = strlen(the_modes) - 1;
 308                 if (the_modes[len] == '+' || the_modes[len] == '-')
 309                         the_modes[len] = '\0';
 310
 311                 if (Client_Type(Client) == CLIENT_SERVER) {
 312                         /* Forward modes to other servers */
 313                         if (Client_Conn(Target) != NONE) {
 314                                 /* Remote server (service?) changed modes
 315                                  * for one of our clients. Inform it! */
 316                                 IRC_WriteStrClientPrefix(Target, Origin,
 317                                                          "MODE %s :%s",
 318                                                          Client_ID(Target),
 319                                                          the_modes);
 320                         }
 321                         IRC_WriteStrServersPrefix(Client, Origin,
 322                                                   "MODE %s :%s",
 323                                                   Client_ID(Target),
 324                                                   the_modes);
 325                 } else {
 326                         /* Send reply to client and inform other servers */
 327                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 328                                                       "MODE %s :%s",
 329                                                       Client_ID(Target),
 330                                                       the_modes);
 331                         IRC_WriteStrServersPrefix(Client, Origin,
 332                                                   "MODE %s :%s",
 333                                                   Client_ID(Target),
 334                                                   the_modes);
 335                 }
 336                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 337                          Client_TypeText(Target), Client_Mask(Target),
 338                          Client_Modes(Target));
 339         }
 340
 341         IRC_SetPenalty(Client, 1);
 342         return ok;
 343 } /* Client_Mode */
 344
 345
 346 static bool
 347 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 348 {
 349         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 350         const char *mode_ptr;
 351
 352         /* Member or not? -- That's the question! */
 353         if (!Channel_IsMemberOf(Channel, Origin))
 354                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 355                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 356
 357         /* The sender is a member: generate extended reply */
 358         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 359         mode_ptr = the_modes;
 360         the_args[0] = '\0';
 361
 362         while(*mode_ptr) {
 363                 switch(*mode_ptr) {
 364                 case 'l':
 365                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 366                         strlcat(the_args, argadd, sizeof(the_args));
 367                         break;
 368                 case 'k':
 369                         strlcat(the_args, " ", sizeof(the_args));
 370                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 371                         break;
 372                 }
 373                 mode_ptr++;
 374         }
 375         if (the_args[0])
 376                 strlcat(the_modes, the_args, sizeof(the_modes));
 377
 378         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 379                                 Client_ID(Origin), Channel_Name(Channel),
 380                                 the_modes))
 381                 return DISCONNECTED;
 382 #ifndef STRICT_RFC
 383         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 384                                   Client_ID(Origin), Channel_Name(Channel),
 385                                   Channel_CreationTime(Channel)))
 386                 return DISCONNECTED;
 387 #endif
 388         return CONNECTED;
 389 }
 390
 391
 392 /**
 393  * Handle channel mode and channel-user mode changes
 394  */
 395 static bool
 396 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 397 {
 398         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 399             argadd[CLIENT_PASS_LEN], *mode_ptr;
 400         bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
 401         int mode_arg, arg_arg, mode_arg_count = 0;
 402         CLIENT *client;
 403         long l;
 404         size_t len;
 405
 406         if (Channel_IsModeless(Channel))
 407                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 408                                 Client_ID(Client), Channel_Name(Channel));
 409
 410         /* Mode request: let's answer it :-) */
 411         if (Req->argc <= 1)
 412                 return Channel_Mode_Answer_Request(Origin, Channel);
 413
 414         Channel_CheckAdminRights(Channel, Client, Origin,
 415                                  &onchannel, &modeok, &use_servermode);
 416
 417         if (!onchannel && !modeok)
 418                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 419                                           Client_ID(Origin),
 420                                           Channel_Name(Channel));
 421
 422         mode_arg = 1;
 423         mode_ptr = Req->argv[mode_arg];
 424         if (Req->argc > mode_arg + 1)
 425                 arg_arg = mode_arg + 1;
 426         else
 427                 arg_arg = -1;
 428
 429         /* Initial state: set or unset modes? */
 430         skiponce = false;
 431         switch (*mode_ptr) {
 432         case '-':
 433                 set = false;
 434                 break;
 435         case '+':
 436                 set = true;
 437                 break;
 438         default:
 439                 set = true;
 440                 skiponce = true;
 441         }
 442
 443         /* Prepare reply string */
 444         strcpy(the_modes, set ? "+" : "-");
 445         the_args[0] = '\0';
 446
 447         x[1] = '\0';
 448         connected = CONNECTED;
 449         while (mode_ptr) {
 450                 if (!skiponce)
 451                         mode_ptr++;
 452                 if (!*mode_ptr) {
 453                         /* Try next argument if there's any */
 454                         if (arg_arg < 0)
 455                                 break;
 456                         if (arg_arg > mode_arg)
 457                                 mode_arg = arg_arg;
 458                         else
 459                                 mode_arg++;
 460
 461                         if (mode_arg >= Req->argc)
 462                                 break;
 463                         mode_ptr = Req->argv[mode_arg];
 464
 465                         if (Req->argc > mode_arg + 1)
 466                                 arg_arg = mode_arg + 1;
 467                         else
 468                                 arg_arg = -1;
 469                 }
 470                 skiponce = false;
 471
 472                 switch (*mode_ptr) {
 473                 case '+':
 474                 case '-':
 475                         if (((*mode_ptr == '+') && !set)
 476                             || ((*mode_ptr == '-') && set)) {
 477                                 /* Action modifier ("+"/"-") must be changed ... */
 478                                 len = strlen(the_modes) - 1;
 479                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 480                                         /* Adjust last action modifier in result */
 481                                         the_modes[len] = *mode_ptr;
 482                                 } else {
 483                                         /* Append modifier character to result string */
 484                                         x[0] = *mode_ptr;
 485                                         strlcat(the_modes, x, sizeof(the_modes));
 486                                 }
 487                                 set = *mode_ptr == '+';
 488                         }
 489                         continue;
 490                 }
 491
 492                 /* Are there arguments left? */
 493                 if (arg_arg >= Req->argc)
 494                         arg_arg = -1;
 495
 496                 /* Validate modes */
 497                 x[0] = '\0';
 498                 argadd[0] = '\0';
 499                 client = NULL;
 500                 switch (*mode_ptr) {
 501                 /* --- Channel modes --- */
 502                 case 'i': /* Invite only */
 503                 case 'm': /* Moderated */
 504                 case 'n': /* Only members can write */
 505                 case 'R': /* Registered users only */
 506                 case 's': /* Secret channel */
 507                 case 't': /* Topic locked */
 508                 case 'z': /* Secure connections only */
 509                         if (modeok)
 510                                 x[0] = *mode_ptr;
 511                         else
 512                                 connected = IRC_WriteStrClient(Origin,
 513                                         ERR_CHANOPRIVSNEEDED_MSG,
 514                                         Client_ID(Origin), Channel_Name(Channel));
 515                         break;
 516                 case 'k': /* Channel key */
 517                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 518                                 goto chan_exit;
 519                         if (!set) {
 520                                 if (modeok)
 521                                         x[0] = *mode_ptr;
 522                                 else
 523                                         connected = IRC_WriteStrClient(Origin,
 524                                                 ERR_CHANOPRIVSNEEDED_MSG,
 525                                                 Client_ID(Origin),
 526                                                 Channel_Name(Channel));
 527                                 break;
 528                         }
 529                         if (arg_arg > mode_arg) {
 530                                 if (modeok) {
 531                                         Channel_ModeDel(Channel, 'k');
 532                                         Channel_SetKey(Channel,
 533                                                        Req->argv[arg_arg]);
 534                                         strlcpy(argadd, Channel_Key(Channel),
 535                                                 sizeof(argadd));
 536                                         x[0] = *mode_ptr;
 537                                 } else {
 538                                         connected = IRC_WriteStrClient(Origin,
 539                                                 ERR_CHANOPRIVSNEEDED_MSG,
 540                                                 Client_ID(Origin),
 541                                                 Channel_Name(Channel));
 542                                 }
 543                                 Req->argv[arg_arg][0] = '\0';
 544                                 arg_arg++;
 545                         } else {
 546                                 connected = IRC_WriteStrClient(Origin,
 547                                         ERR_NEEDMOREPARAMS_MSG,
 548                                         Client_ID(Origin), Req->command);
 549                                 goto chan_exit;
 550                         }
 551                         break;
 552                 case 'l': /* Member limit */
 553                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 554                                 goto chan_exit;
 555                         if (!set) {
 556                                 if (modeok)
 557                                         x[0] = *mode_ptr;
 558                                 else
 559                                         connected = IRC_WriteStrClient(Origin,
 560                                                 ERR_CHANOPRIVSNEEDED_MSG,
 561                                                 Client_ID(Origin),
 562                                                 Channel_Name(Channel));
 563                                 break;
 564                         }
 565                         if (arg_arg > mode_arg) {
 566                                 if (modeok) {
 567                                         l = atol(Req->argv[arg_arg]);
 568                                         if (l > 0 && l < 0xFFFF) {
 569                                                 Channel_ModeDel(Channel, 'l');
 570                                                 Channel_SetMaxUsers(Channel, l);
 571                                                 snprintf(argadd, sizeof(argadd),
 572                                                          "%ld", l);
 573                                                 x[0] = *mode_ptr;
 574                                         }
 575                                 } else {
 576                                         connected = IRC_WriteStrClient(Origin,
 577                                                 ERR_CHANOPRIVSNEEDED_MSG,
 578                                                 Client_ID(Origin),
 579                                                 Channel_Name(Channel));
 580                                 }
 581                                 Req->argv[arg_arg][0] = '\0';
 582                                 arg_arg++;
 583                         } else {
 584                                 connected = IRC_WriteStrClient(Origin,
 585                                         ERR_NEEDMOREPARAMS_MSG,
 586                                         Client_ID(Origin), Req->command);
 587                                 goto chan_exit;
 588                         }
 589                         break;
 590                 case 'O': /* IRC operators only */
 591                         if (modeok) {
 592                                 /* Only IRC operators are allowed to
 593                                  * set the 'O' channel mode! */
 594                                 if (set && !(Client_OperByMe(Client)
 595                                     || Client_Type(Client) == CLIENT_SERVER))
 596                                         connected = IRC_WriteStrClient(Origin,
 597                                                 ERR_NOPRIVILEGES_MSG,
 598                                                 Client_ID(Origin));
 599                                 else
 600                                         x[0] = 'O';
 601                         } else
 602                                 connected = IRC_WriteStrClient(Origin,
 603                                                 ERR_CHANOPRIVSNEEDED_MSG,
 604                                                 Client_ID(Origin),
 605                                                 Channel_Name(Channel));
 606                                 break;
 607                 case 'P': /* Persistent channel */
 608                         if (modeok) {
 609                                 /* Only IRC operators are allowed to
 610                                  * set the 'P' 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] = 'P';
 618                         } else
 619                                 connected = IRC_WriteStrClient(Origin,
 620                                         ERR_CHANOPRIVSNEEDED_MSG,
 621                                         Client_ID(Origin),
 622                                         Channel_Name(Channel));
 623                         break;
 624                 /* --- Channel user modes --- */
 625                 case 'a':
 626                 case 'h':
 627                 case 'q':
 628                         if (Client_Type(Client) != CLIENT_SERVER) {
 629                                 connected = IRC_WriteStrClient(Origin,
 630                                         ERR_CHANOPRIVSNEEDED_MSG,
 631                                         Client_ID(Origin),
 632                                         Channel_Name(Channel));
 633                                 goto chan_exit;
 634                         }
 635                 case 'o': /* Channel operator */
 636                 case 'v': /* Voice */
 637                         if (arg_arg > mode_arg) {
 638                                 if (modeok) {
 639                                         client = Client_Search(Req->argv[arg_arg]);
 640                                         if (client)
 641                                                 x[0] = *mode_ptr;
 642                                         else
 643                                                 connected = IRC_WriteStrClient(Client,
 644                                                         ERR_NOSUCHNICK_MSG,
 645                                                         Client_ID(Client),
 646                                                         Req->argv[arg_arg]);
 647                                 } else {
 648                                         connected = IRC_WriteStrClient(Origin,
 649                                                 ERR_CHANOPRIVSNEEDED_MSG,
 650                                                 Client_ID(Origin),
 651                                                 Channel_Name(Channel));
 652                                 }
 653                                 Req->argv[arg_arg][0] = '\0';
 654                                 arg_arg++;
 655                         } else {
 656                                 connected = IRC_WriteStrClient(Origin,
 657                                         ERR_NEEDMOREPARAMS_MSG,
 658                                         Client_ID(Origin), Req->command);
 659                                 goto chan_exit;
 660                         }
 661                         break;
 662                 /* --- Channel lists --- */
 663                 case 'I': /* Invite lists */
 664                 case 'b': /* Ban lists */
 665                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 666                                 goto chan_exit;
 667                         if (arg_arg > mode_arg) {
 668                                 /* modify list */
 669                                 if (modeok) {
 670                                         connected = set
 671                                            ? Add_Ban_Invite(*mode_ptr, Origin,
 672                                                 Client, Channel,
 673                                                 Req->argv[arg_arg])
 674                                            : Del_Ban_Invite(*mode_ptr, Origin,
 675                                                 Client, Channel,
 676                                                 Req->argv[arg_arg]);
 677                                 } else {
 678                                         connected = IRC_WriteStrClient(Origin,
 679                                                 ERR_CHANOPRIVSNEEDED_MSG,
 680                                                 Client_ID(Origin),
 681                                                 Channel_Name(Channel));
 682                                 }
 683                                 Req->argv[arg_arg][0] = '\0';
 684                                 arg_arg++;
 685                         } else {
 686                                 if (*mode_ptr == 'I')
 687                                         Channel_ShowInvites(Origin, Channel);
 688                                 else
 689                                         Channel_ShowBans(Origin, Channel);
 690                         }
 691                         break;
 692                 default:
 693                         if (Client_Type(Client) != CLIENT_SERVER) {
 694                                 Log(LOG_DEBUG,
 695                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 696                                     set ? '+' : '-', *mode_ptr,
 697                                     Client_ID(Origin), Channel_Name(Channel));
 698                                 connected = IRC_WriteStrClient(Origin,
 699                                         ERR_UNKNOWNMODE_MSG,
 700                                         Client_ID(Origin), *mode_ptr,
 701                                         Channel_Name(Channel));
 702                                 x[0] = '\0';
 703                         } else {
 704                                 Log(LOG_DEBUG,
 705                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 706                                     set ? '+' : '-', *mode_ptr,
 707                                     Client_ID(Origin), Channel_Name(Channel));
 708                                 x[0] = *mode_ptr;
 709                         }
 710                 }
 711
 712                 if (!connected)
 713                         break;
 714
 715                 /* Is there a valid mode change? */
 716                 if (!x[0])
 717                         continue;
 718
 719                 /* Validate target client */
 720                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 721                         if (!IRC_WriteStrClient
 722                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 723                              Client_ID(Origin), Client_ID(client),
 724                              Channel_Name(Channel)))
 725                                 break;
 726
 727                         continue;
 728                 }
 729
 730                 if (client) {
 731                         /* Channel-User-Mode */
 732                         retval = set
 733                                ? Channel_UserModeAdd(Channel, client, x[0])
 734                                : Channel_UserModeDel(Channel, client, x[0]);
 735                         if (retval) {
 736                                 strlcat(the_args, " ", sizeof(the_args));
 737                                 strlcat(the_args, Client_ID(client),
 738                                         sizeof(the_args));
 739                                 strlcat(the_modes, x, sizeof(the_modes));
 740                                 LogDebug
 741                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 742                                      Client_Mask(client), Channel_Name(Channel),
 743                                      Channel_UserModes(Channel, client));
 744                         }
 745                 } else {
 746                         /* Channel-Mode */
 747                         retval = set
 748                                ? Channel_ModeAdd(Channel, x[0])
 749                                : Channel_ModeDel(Channel, x[0]);
 750                         if (retval) {
 751                                 strlcat(the_modes, x, sizeof(the_modes));
 752                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 753                                          Channel_Name(Channel),
 754                                          Channel_Modes(Channel));
 755                         }
 756                 }
 757
 758                 /* Are there additional arguments to add? */
 759                 if (argadd[0]) {
 760                         strlcat(the_args, " ", sizeof(the_args));
 761                         strlcat(the_args, argadd, sizeof(the_args));
 762                 }
 763         }
 764
 765       chan_exit:
 766         /* Are there changed modes? */
 767         if (the_modes[1]) {
 768                 /* Clean up mode string */
 769                 len = strlen(the_modes) - 1;
 770                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 771                         the_modes[len] = '\0';
 772
 773                 if (Client_Type(Client) == CLIENT_SERVER) {
 774                         /* MODE requests for local channels from other servers
 775                          * are definitely invalid! */
 776                         if (Channel_IsLocal(Channel)) {
 777                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 778                                 return CONNECTED;
 779                         }
 780
 781                         /* Forward mode changes to channel users and all the
 782                          * other remote servers: */
 783                         IRC_WriteStrServersPrefix(Client, Origin,
 784                                 "MODE %s %s%s", Channel_Name(Channel),
 785                                 the_modes, the_args);
 786                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 787                                 false, "MODE %s %s%s", Channel_Name(Channel),
 788                                 the_modes, the_args);
 789                 } else {
 790                         if (use_servermode)
 791                                 Origin = Client_ThisServer();
 792                         /* Send reply to client and inform other servers and channel users */
 793                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 794                                         "MODE %s %s%s", Channel_Name(Channel),
 795                                         the_modes, the_args);
 796                         /* Only forward requests for non-local channels */
 797                         if (!Channel_IsLocal(Channel))
 798                                 IRC_WriteStrServersPrefix(Client, Origin,
 799                                         "MODE %s %s%s", Channel_Name(Channel),
 800                                         the_modes, the_args);
 801                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 802                                 false, "MODE %s %s%s", Channel_Name(Channel),
 803                                 the_modes, the_args);
 804                 }
 805         }
 806
 807         IRC_SetPenalty(Client, 1);
 808         return connected;
 809 } /* Channel_Mode */
 810
 811
 812 GLOBAL bool
 813 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 814 {
 815         assert( Client != NULL );
 816         assert( Req != NULL );
 817
 818         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 819
 820         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 821         {
 822                 Client_SetAway( Client, Req->argv[0] );
 823                 Client_ModeAdd( Client, 'a' );
 824                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 825                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 826         }
 827         else
 828         {
 829                 Client_ModeDel( Client, 'a' );
 830                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 831                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 832         }
 833 } /* IRC_AWAY */
 834
 835
 836 /**
 837  * Add entries to channel ban and invite lists.
 838  *
 839  * @param what Can be 'I' for invite or 'b' for ban list.
 840  * @param Prefix The originator of the command.
 841  * @param Client The sender of the command.
 842  * @param Channel The channel of which the list should be modified.
 843  * @param Pattern The pattern to add to the list.
 844  * @return CONNECTED or DISCONNECTED.
 845  */
 846 static bool
 847 Add_Ban_Invite(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 848                const char *Pattern)
 849 {
 850         const char *mask;
 851         struct list_head *list;
 852
 853         assert(Client != NULL);
 854         assert(Channel != NULL);
 855         assert(Pattern != NULL);
 856         assert(what == 'I' || what == 'b');
 857
 858         mask = Lists_MakeMask(Pattern);
 859
 860         if (what == 'I')
 861                 list = Channel_GetListInvites(Channel);
 862         else
 863                 list = Channel_GetListBans(Channel);
 864
 865         if (Lists_CheckDupeMask(list, mask))
 866                 return CONNECTED;
 867         if (Client_Type(Client) == CLIENT_USER &&
 868             Lists_Count(list) >= MAX_HNDL_CHANNEL_LISTS)
 869                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
 870                                           Client_ID(Client),
 871                                           Channel_Name(Channel), mask,
 872                                           MAX_HNDL_CHANNEL_LISTS);
 873
 874         if (what == 'I') {
 875                 if (!Channel_AddInvite(Channel, mask, false))
 876                         return CONNECTED;
 877         } else {
 878                 if (!Channel_AddBan(Channel, mask))
 879                         return CONNECTED;
 880         }
 881         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
 882 }
 883
 884
 885 /**
 886  * Delete entries from channel ban and invite lists.
 887  *
 888  * @param what Can be 'I' for invite or 'b' for ban list.
 889  * @param Prefix The originator of the command.
 890  * @param Client The sender of the command.
 891  * @param Channel The channel of which the list should be modified.
 892  * @param Pattern The pattern to add to the list.
 893  * @return CONNECTED or DISCONNECTED.
 894  */
 895 static bool
 896 Del_Ban_Invite(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 897                const char *Pattern)
 898 {
 899         const char *mask;
 900         struct list_head *list;
 901
 902         assert(Client != NULL);
 903         assert(Channel != NULL);
 904         assert(Pattern != NULL);
 905         assert(what == 'I' || what == 'b');
 906
 907         mask = Lists_MakeMask(Pattern);
 908
 909         if (what == 'I')
 910                 list = Channel_GetListInvites(Channel);
 911         else
 912                 list = Channel_GetListBans(Channel);
 913
 914         if (!Lists_CheckDupeMask(list, mask))
 915                 return CONNECTED;
 916         Lists_Del(list, mask);
 917
 918         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
 919 }
 920
 921
 922 /**
 923  * Send information about changed channel ban/invite lists to clients.
 924  *
 925  * @param IsAdd true if the list item has been added, false otherwise.
 926  * @param ModeChar The mode to use (e. g. 'b' or 'I')
 927  * @param Prefix The originator of the mode list change.
 928  * @param Client The sender of the command.
 929  * @param Channel The channel of which the list has been modified.
 930  * @param Mask The mask which has been added or removed.
 931  * @return CONNECTED or DISCONNECTED.
 932  */
 933 static bool
 934 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
 935                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
 936 {
 937         bool ok = true;
 938
 939         /* Send confirmation to the client */
 940         if (Client_Type(Client) == CLIENT_USER)
 941                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
 942                                               Channel_Name(Channel),
 943                                               IsAdd ? '+' : '-',
 944                                               ModeChar, Mask);
 945
 946         /* to other servers */
 947         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
 948                                   Channel_Name(Channel), IsAdd ? '+' : '-',
 949                                   ModeChar, Mask);
 950
 951         /* and local users in channel */
 952         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
 953                                   "MODE %s %c%c %s", Channel_Name(Channel),
 954                                   IsAdd ? '+' : '-', ModeChar, Mask );
 955
 956         return ok;
 957 } /* Send_ListChange */
 958
 959
 960 /* -eof- */