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