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 void Announce_Client_Hostname PARAMS((CLIENT *Origin, CLIENT *Client));
  40
  41 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42                                 CLIENT *Target));
  43 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  44                                  CHANNEL *Channel));
  45
  46 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  47                                 CHANNEL *Channel, const char *Pattern));
  48 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  49                                   CHANNEL *Channel, const char *Pattern));
  50
  51 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  52                                     CLIENT *Prefix, CLIENT *Client,
  53                                     CHANNEL *Channel, const char *Mask));
  54
  55
  56 /**
  57  * Handler for the IRC "MODE" command.
  58  *
  59  * See RFC 2812 section 3.1.5 ("user mode message") and section 3.2.3
  60  * ("channel mode message"), and RFC 2811 section 4 ("channel modes").
  61  *
  62  * @param Client        The client from which this command has been received.
  63  * @param Req           Request structure with prefix and all parameters.
  64  * @returns             CONNECTED or DISCONNECTED.
  65  */
  66 GLOBAL bool
  67 IRC_MODE( CLIENT *Client, REQUEST *Req )
  68 {
  69         CLIENT *cl, *origin;
  70         CHANNEL *chan;
  71
  72         assert(Client != NULL);
  73         assert(Req != NULL);
  74
  75         /* No parameters? */
  76         if (Req->argc < 1)
  77                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  78                                           Client_ID(Client), Req->command);
  79
  80         /* Origin for answers */
  81         if (Client_Type(Client) == CLIENT_SERVER) {
  82                 origin = Client_Search(Req->prefix);
  83                 if (!origin)
  84                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  85                                                   Client_ID(Client),
  86                                                   Req->prefix);
  87         } else
  88                 origin = Client;
  89
  90         /* Channel or user mode? */
  91         cl = NULL; chan = NULL;
  92         if (Client_IsValidNick(Req->argv[0]))
  93                 cl = Client_Search(Req->argv[0]);
  94         if (Channel_IsValidName(Req->argv[0]))
  95                 chan = Channel_Search(Req->argv[0]);
  96
  97         if (cl)
  98                 return Client_Mode(Client, Req, origin, cl);
  99         if (chan)
 100                 return Channel_Mode(Client, Req, origin, chan);
 101
 102         /* No target found! */
 103         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 104                         Client_ID(Client), Req->argv[0]);
 105 } /* IRC_MODE */
 106
 107
 108 /**
 109  * Check if the "mode limit" for a client has been reached.
 110  *
 111  * This limit doesn't apply for servers or services!
 112  *
 113  * @param Client The client to check.
 114  * @param Count The number of modes already handled.
 115  * @return true if the limit has been reached.
 116  */
 117 static bool
 118 Mode_Limit_Reached(CLIENT *Client, int Count)
 119 {
 120         if (Client_Type(Client) == CLIENT_SERVER
 121             || Client_Type(Client) == CLIENT_SERVICE)
 122                 return false;
 123         if (Count < MAX_HNDL_MODES_ARG)
 124                 return false;
 125         return true;
 126 }
 127
 128
 129 /**
 130  * Handle client mode requests
 131  *
 132  * @param Client        The client from which this command has been received.
 133  * @param Req           Request structure with prefix and all parameters.
 134  * @param Origin        The originator of the MODE command (prefix).
 135  * @param Target        The target (client) of this MODE command.
 136  * @returns             CONNECTED or DISCONNECTED.
 137  */
 138 static bool
 139 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 140 {
 141         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 142         bool ok, set;
 143         bool send_RPL_HOSTHIDDEN_MSG = false;
 144         int mode_arg;
 145         size_t len;
 146
 147         /* Is the client allowed to request or change the modes? */
 148         if (Client_Type(Client) == CLIENT_USER) {
 149                 /* Users are only allowed to manipulate their own modes! */
 150                 if (Target != Client)
 151                         return IRC_WriteStrClient(Client,
 152                                                   ERR_USERSDONTMATCH_MSG,
 153                                                   Client_ID(Client));
 154         }
 155
 156         /* Mode request: let's answer it :-) */
 157         if (Req->argc == 1)
 158                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 159                                           Client_ID(Target),
 160                                           Client_Modes(Target));
 161
 162         mode_arg = 1;
 163         mode_ptr = Req->argv[mode_arg];
 164
 165         /* Initial state: set or unset modes? */
 166         if (*mode_ptr == '+') {
 167                 set = true;
 168                 strcpy(the_modes, "+");
 169         } else if (*mode_ptr == '-') {
 170                 set = false;
 171                 strcpy(the_modes, "-");
 172         } else
 173                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 174                                           Client_ID(Origin));
 175
 176         x[1] = '\0';
 177         ok = CONNECTED;
 178         while (mode_ptr) {
 179                 mode_ptr++;
 180                 if (!*mode_ptr) {
 181                         /* Try next argument if there's any */
 182                         mode_arg++;
 183                         if (mode_arg < Req->argc)
 184                                 mode_ptr = Req->argv[mode_arg];
 185                         else
 186                                 break;
 187                 }
 188
 189                 switch(*mode_ptr) {
 190                   case '+':
 191                   case '-':
 192                         if ((*mode_ptr == '+' && !set)
 193                             || (*mode_ptr == '-' && set)) {
 194                                 /* Action modifier ("+"/"-") must be changed */
 195                                 len = strlen(the_modes) - 1;
 196                                 if (the_modes[len] == '+'
 197                                     || the_modes[len] == '-') {
 198                                         /* Last character in the "result
 199                                          * string" was an "action", so just
 200                                          * overwrite it with the new action */
 201                                         the_modes[len] = *mode_ptr;
 202                                 } else {
 203                                         /* Append new modifier character to
 204                                          * the resulting mode string */
 205                                         x[0] = *mode_ptr;
 206                                         strlcat(the_modes, x,
 207                                                 sizeof(the_modes));
 208                                 }
 209                                 if (*mode_ptr == '+')
 210                                         set = true;
 211                                 else
 212                                         set = false;
 213                         }
 214                         continue;
 215                 }
 216
 217                 /* Validate modes */
 218                 x[0] = '\0';
 219                 switch (*mode_ptr) {
 220                 case 'b': /* Block private msgs */
 221                 case 'C': /* Only messages from clients sharing a channel */
 222                 case 'i': /* Invisible */
 223                 case 's': /* Server messages */
 224                 case 'w': /* Wallops messages */
 225                         x[0] = *mode_ptr;
 226                         break;
 227                 case 'a': /* Away */
 228                         if (Client_Type(Client) == CLIENT_SERVER) {
 229                                 x[0] = 'a';
 230                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 231                         } else
 232                                 ok = IRC_WriteStrClient(Origin,
 233                                                         ERR_NOPRIVILEGES_MSG,
 234                                                         Client_ID(Origin));
 235                         break;
 236                 case 'B': /* Bot */
 237                         if (Client_HasMode(Client, 'r'))
 238                                 ok = IRC_WriteStrClient(Origin,
 239                                                         ERR_RESTRICTED_MSG,
 240                                                         Client_ID(Origin));
 241                         else
 242                                 x[0] = 'B';
 243                         break;
 244                 case 'c': /* Receive connect notices
 245                            * (only settable by IRC operators!) */
 246                         if (!set || Client_Type(Client) == CLIENT_SERVER
 247                             || Client_OperByMe(Origin))
 248                                 x[0] = 'c';
 249                         else
 250                                 ok = IRC_WriteStrClient(Origin,
 251                                                         ERR_NOPRIVILEGES_MSG,
 252                                                         Client_ID(Origin));
 253                         break;
 254                 case 'o': /* IRC operator (only unsettable!) */
 255                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 256                                 Client_SetOperByMe(Target, false);
 257                                 x[0] = 'o';
 258                         } else
 259                                 ok = IRC_WriteStrClient(Origin,
 260                                                         ERR_NOPRIVILEGES_MSG,
 261                                                         Client_ID(Origin));
 262                         break;
 263                 case 'q': /* KICK-protected user */
 264                         if (!set || Client_Type(Client) == CLIENT_SERVER
 265                             || Client_OperByMe(Origin))
 266                                 x[0] = 'q';
 267                         else
 268                                 ok = IRC_WriteStrClient(Origin,
 269                                                         ERR_NOPRIVILEGES_MSG,
 270                                                         Client_ID(Origin));
 271                         break;
 272                 case 'r': /* Restricted (only settable) */
 273                         if (set || Client_Type(Client) == CLIENT_SERVER)
 274                                 x[0] = 'r';
 275                         else
 276                                 ok = IRC_WriteStrClient(Origin,
 277                                                         ERR_RESTRICTED_MSG,
 278                                                         Client_ID(Origin));
 279                         break;
 280                 case 'R': /* Registered (not [un]settable by clients) */
 281                         if (Client_Type(Client) == CLIENT_SERVER)
 282                                 x[0] = 'R';
 283                         else
 284                                 ok = IRC_WriteStrClient(Origin,
 285                                                         ERR_NICKREGISTER_MSG,
 286                                                         Client_ID(Origin));
 287                         break;
 288                 case 'x': /* Cloak hostname */
 289                         if (Client_HasMode(Client, 'r'))
 290                                 ok = IRC_WriteStrClient(Origin,
 291                                                         ERR_RESTRICTED_MSG,
 292                                                         Client_ID(Origin));
 293                         else if (!set || Conf_CloakHostModeX[0]
 294                                  || Client_Type(Client) == CLIENT_SERVER
 295                                  || Client_OperByMe(Client)) {
 296                                 x[0] = 'x';
 297                                 send_RPL_HOSTHIDDEN_MSG = true;
 298                         } else
 299                                 ok = IRC_WriteStrClient(Origin,
 300                                                         ERR_NOPRIVILEGES_MSG,
 301                                                         Client_ID(Origin));
 302                         break;
 303                 default:
 304                         if (Client_Type(Client) != CLIENT_SERVER) {
 305                                 Log(LOG_DEBUG,
 306                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 307                                     set ? '+' : '-', *mode_ptr,
 308                                     Client_ID(Origin));
 309                                 ok = IRC_WriteStrClient(Origin,
 310                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 311                                                         Client_ID(Origin),
 312                                                         set ? '+' : '-',
 313                                                         *mode_ptr);
 314                                 x[0] = '\0';
 315                         } else {
 316                                 Log(LOG_DEBUG,
 317                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 318                                     set ? '+' : '-', *mode_ptr,
 319                                     Client_ID(Origin), Client_ID(Target));
 320                                 x[0] = *mode_ptr;
 321                         }
 322                 }
 323
 324                 if (!ok)
 325                         break;
 326
 327                 /* Is there a valid mode change? */
 328                 if (!x[0])
 329                         continue;
 330
 331                 if (set) {
 332                         if (Client_ModeAdd(Target, x[0]))
 333                                 strlcat(the_modes, x, sizeof(the_modes));
 334                 } else {
 335                         if (Client_ModeDel(Target, x[0]))
 336                                 strlcat(the_modes, x, sizeof(the_modes));
 337                 }
 338         }
 339
 340         /* Are there changed modes? */
 341         if (the_modes[1]) {
 342                 /* Remove needless action modifier characters */
 343                 len = strlen(the_modes) - 1;
 344                 if (the_modes[len] == '+' || the_modes[len] == '-')
 345                         the_modes[len] = '\0';
 346
 347                 if (Client_Type(Client) == CLIENT_SERVER) {
 348                         /* Forward modes to other servers */
 349                         if (Client_Conn(Target) != NONE) {
 350                                 /* Remote server (service?) changed modes
 351                                  * for one of our clients. Inform it! */
 352                                 IRC_WriteStrClientPrefix(Target, Origin,
 353                                                          "MODE %s :%s",
 354                                                          Client_ID(Target),
 355                                                          the_modes);
 356                         }
 357                         IRC_WriteStrServersPrefix(Client, Origin,
 358                                                   "MODE %s :%s",
 359                                                   Client_ID(Target),
 360                                                   the_modes);
 361                 } else {
 362                         /* Send reply to client and inform other servers */
 363                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 364                                                       "MODE %s :%s",
 365                                                       Client_ID(Target),
 366                                                       the_modes);
 367                         IRC_WriteStrServersPrefix(Client, Origin,
 368                                                   "MODE %s :%s",
 369                                                   Client_ID(Target),
 370                                                   the_modes);
 371                         if (send_RPL_HOSTHIDDEN_MSG)
 372                                 Announce_Client_Hostname(Origin, Client);
 373                 }
 374                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 375                          Client_TypeText(Target), Client_Mask(Target),
 376                          Client_Modes(Target));
 377         }
 378
 379         IRC_SetPenalty(Client, 1);
 380         return ok;
 381 } /* Client_Mode */
 382
 383
 384 /**
 385  * Announce changed client hostname in the network.
 386  *
 387  * @param Client The client of which the hostname changed.
 388  */
 389 static void
 390 Announce_Client_Hostname(CLIENT *Origin, CLIENT *Client)
 391 {
 392         assert(Client != NULL);
 393
 394         /* Inform the client itself */
 395         IRC_WriteStrClient(Client, RPL_HOSTHIDDEN_MSG, Client_ID(Client),
 396                            Client_HostnameDisplayed(Client));
 397
 398         /* Inform other servers in the network */
 399         IRC_WriteStrServersPrefixFlag(Origin, Client_ThisServer(), 'M',
 400                                       "METADATA %s host :%s", Client_ID(Client),
 401                                       Client_HostnameDisplayed(Client));
 402 }
 403
 404
 405 static bool
 406 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 407 {
 408         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 409         const char *mode_ptr;
 410
 411         /* Member or not? -- That's the question! */
 412         if (!Channel_IsMemberOf(Channel, Origin))
 413                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 414                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 415
 416         /* The sender is a member: generate extended reply */
 417         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 418         mode_ptr = the_modes;
 419         the_args[0] = '\0';
 420
 421         while(*mode_ptr) {
 422                 switch(*mode_ptr) {
 423                 case 'l':
 424                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 425                         strlcat(the_args, argadd, sizeof(the_args));
 426                         break;
 427                 case 'k':
 428                         strlcat(the_args, " ", sizeof(the_args));
 429                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 430                         break;
 431                 }
 432                 mode_ptr++;
 433         }
 434         if (the_args[0])
 435                 strlcat(the_modes, the_args, sizeof(the_modes));
 436
 437         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 438                                 Client_ID(Origin), Channel_Name(Channel),
 439                                 the_modes))
 440                 return DISCONNECTED;
 441 #ifndef STRICT_RFC
 442         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 443                                   Client_ID(Origin), Channel_Name(Channel),
 444                                   Channel_CreationTime(Channel)))
 445                 return DISCONNECTED;
 446 #endif
 447         return CONNECTED;
 448 }
 449
 450
 451 /**
 452  * Handle channel mode and channel-user mode changes
 453  */
 454 static bool
 455 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 456 {
 457         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 458             argadd[CLIENT_PASS_LEN], *mode_ptr, *o_mode_ptr;
 459         bool connected, set, skiponce, retval, use_servermode,
 460              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 461         int mode_arg, arg_arg, mode_arg_count = 0;
 462         CLIENT *client;
 463         long l;
 464         size_t len;
 465
 466         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 467
 468         if (Channel_IsModeless(Channel))
 469                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 470                                 Client_ID(Client), Channel_Name(Channel));
 471
 472         /* Mode request: let's answer it :-) */
 473         if (Req->argc <= 1)
 474                 return Channel_Mode_Answer_Request(Origin, Channel);
 475
 476         /* Check if origin is oper and opers can use mode */
 477         use_servermode = Conf_OperServerMode;
 478         if(Client_OperByMe(Client) && Conf_OperCanMode) {
 479                 is_oper = true;
 480         }
 481
 482         /* Check if client is a server/service */
 483         if(Client_Type(Client) == CLIENT_SERVER ||
 484            Client_Type(Client) == CLIENT_SERVICE) {
 485                 is_machine = true;
 486         }
 487
 488         /* Check if client is member of channel or an oper or an server/service */
 489         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 490                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 491                                           Client_ID(Origin),
 492                                           Channel_Name(Channel));
 493
 494         mode_arg = 1;
 495         mode_ptr = Req->argv[mode_arg];
 496         if (Req->argc > mode_arg + 1)
 497                 arg_arg = mode_arg + 1;
 498         else
 499                 arg_arg = -1;
 500
 501         /* Initial state: set or unset modes? */
 502         skiponce = false;
 503         switch (*mode_ptr) {
 504         case '-':
 505                 set = false;
 506                 break;
 507         case '+':
 508                 set = true;
 509                 break;
 510         default:
 511                 set = true;
 512                 skiponce = true;
 513         }
 514
 515         /* Prepare reply string */
 516         strcpy(the_modes, set ? "+" : "-");
 517         the_args[0] = '\0';
 518
 519         x[1] = '\0';
 520         connected = CONNECTED;
 521         while (mode_ptr) {
 522                 if (!skiponce)
 523                         mode_ptr++;
 524                 if (!*mode_ptr) {
 525                         /* Try next argument if there's any */
 526                         if (arg_arg < 0)
 527                                 break;
 528                         if (arg_arg > mode_arg)
 529                                 mode_arg = arg_arg;
 530                         else
 531                                 mode_arg++;
 532
 533                         if (mode_arg >= Req->argc)
 534                                 break;
 535                         mode_ptr = Req->argv[mode_arg];
 536
 537                         if (Req->argc > mode_arg + 1)
 538                                 arg_arg = mode_arg + 1;
 539                         else
 540                                 arg_arg = -1;
 541                 }
 542                 skiponce = false;
 543
 544                 switch (*mode_ptr) {
 545                 case '+':
 546                 case '-':
 547                         if (((*mode_ptr == '+') && !set)
 548                             || ((*mode_ptr == '-') && set)) {
 549                                 /* Action modifier ("+"/"-") must be changed ... */
 550                                 len = strlen(the_modes) - 1;
 551                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 552                                         /* Adjust last action modifier in result */
 553                                         the_modes[len] = *mode_ptr;
 554                                 } else {
 555                                         /* Append modifier character to result string */
 556                                         x[0] = *mode_ptr;
 557                                         strlcat(the_modes, x, sizeof(the_modes));
 558                                 }
 559                                 set = *mode_ptr == '+';
 560                         }
 561                         continue;
 562                 }
 563
 564                 /* Are there arguments left? */
 565                 if (arg_arg >= Req->argc)
 566                         arg_arg = -1;
 567
 568                 if(!is_machine) {
 569                         o_mode_ptr = Channel_UserModes(Channel, Client);
 570                         while( *o_mode_ptr ) {
 571                                 if ( *o_mode_ptr == 'q')
 572                                         is_owner = true;
 573                                 if ( *o_mode_ptr == 'a')
 574                                         is_admin = true;
 575                                 if ( *o_mode_ptr == 'o')
 576                                         is_op = true;
 577                                 if ( *o_mode_ptr == 'h')
 578                                         is_halfop = true;
 579                                 o_mode_ptr++;
 580                         }
 581                 }
 582
 583                 /* Validate modes */
 584                 x[0] = '\0';
 585                 argadd[0] = '\0';
 586                 client = NULL;
 587                 switch (*mode_ptr) {
 588                 /* --- Channel modes --- */
 589                 case 'R': /* Registered users only */
 590                 case 's': /* Secret channel */
 591                 case 'z': /* Secure connections only */
 592                         if(!is_oper && !is_machine && !is_owner &&
 593                            !is_admin && !is_op) {
 594                                 connected = IRC_WriteStrClient(Origin,
 595                                         ERR_CHANOPRIVSNEEDED_MSG,
 596                                         Client_ID(Origin), Channel_Name(Channel));
 597                                 goto chan_exit;
 598                         }
 599                 case 'i': /* Invite only */
 600                 case 'V': /* Invite disallow */
 601                 case 'M': /* Only identified nicks can write */
 602                 case 'm': /* Moderated */
 603                 case 'n': /* Only members can write */
 604                 case 'Q': /* No kicks */
 605                 case 't': /* Topic locked */
 606                         if(is_oper || is_machine || is_owner ||
 607                            is_admin || is_op || is_halfop)
 608                                 x[0] = *mode_ptr;
 609                         else
 610                                 connected = IRC_WriteStrClient(Origin,
 611                                         ERR_CHANOPRIVSNEEDED_MSG,
 612                                         Client_ID(Origin), Channel_Name(Channel));
 613                         break;
 614                 case 'k': /* Channel key */
 615                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 616                                 goto chan_exit;
 617                         if (!set) {
 618                                 if (is_oper || is_machine || is_owner ||
 619                                     is_admin || is_op || is_halfop)
 620                                         x[0] = *mode_ptr;
 621                                 else
 622                                         connected = IRC_WriteStrClient(Origin,
 623                                                 ERR_CHANOPRIVSNEEDED_MSG,
 624                                                 Client_ID(Origin),
 625                                                 Channel_Name(Channel));
 626                                 break;
 627                         }
 628                         if (arg_arg > mode_arg) {
 629                                 if (is_oper || is_machine || is_owner ||
 630                                     is_admin || is_op || is_halfop) {
 631                                         Channel_ModeDel(Channel, 'k');
 632                                         Channel_SetKey(Channel,
 633                                                        Req->argv[arg_arg]);
 634                                         strlcpy(argadd, Channel_Key(Channel),
 635                                                 sizeof(argadd));
 636                                         x[0] = *mode_ptr;
 637                                 } else {
 638                                         connected = IRC_WriteStrClient(Origin,
 639                                                 ERR_CHANOPRIVSNEEDED_MSG,
 640                                                 Client_ID(Origin),
 641                                                 Channel_Name(Channel));
 642                                 }
 643                                 Req->argv[arg_arg][0] = '\0';
 644                                 arg_arg++;
 645                         } else {
 646                                 connected = IRC_WriteStrClient(Origin,
 647                                         ERR_NEEDMOREPARAMS_MSG,
 648                                         Client_ID(Origin), Req->command);
 649                                 goto chan_exit;
 650                         }
 651                         break;
 652                 case 'l': /* Member limit */
 653                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 654                                 goto chan_exit;
 655                         if (!set) {
 656                                 if (is_oper || is_machine || is_owner ||
 657                                     is_admin || is_op || is_halfop)
 658                                         x[0] = *mode_ptr;
 659                                 else
 660                                         connected = IRC_WriteStrClient(Origin,
 661                                                 ERR_CHANOPRIVSNEEDED_MSG,
 662                                                 Client_ID(Origin),
 663                                                 Channel_Name(Channel));
 664                                 break;
 665                         }
 666                         if (arg_arg > mode_arg) {
 667                                 if (is_oper || is_machine || is_owner ||
 668                                     is_admin || is_op || is_halfop) {
 669                                         l = atol(Req->argv[arg_arg]);
 670                                         if (l > 0 && l < 0xFFFF) {
 671                                                 Channel_ModeDel(Channel, 'l');
 672                                                 Channel_SetMaxUsers(Channel, l);
 673                                                 snprintf(argadd, sizeof(argadd),
 674                                                          "%ld", l);
 675                                                 x[0] = *mode_ptr;
 676                                         }
 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                                 connected = IRC_WriteStrClient(Origin,
 687                                         ERR_NEEDMOREPARAMS_MSG,
 688                                         Client_ID(Origin), Req->command);
 689                                 goto chan_exit;
 690                         }
 691                         break;
 692                 case 'O': /* IRC operators only */
 693                         if (set) {
 694                                 /* Only IRC operators are allowed to
 695                                  * set the 'O' channel mode! */
 696                                 if(is_oper || is_machine)
 697                                         x[0] = 'O';
 698                                 else
 699                                         connected = IRC_WriteStrClient(Origin,
 700                                                 ERR_NOPRIVILEGES_MSG,
 701                                                 Client_ID(Origin));
 702                         } else if(is_oper || is_machine || is_owner ||
 703                                   is_admin || is_op)
 704                                 x[0] = 'O';
 705                         else
 706                                 connected = IRC_WriteStrClient(Origin,
 707                                         ERR_CHANOPRIVSNEEDED_MSG,
 708                                         Client_ID(Origin),
 709                                         Channel_Name(Channel));
 710                         break;
 711                 case 'P': /* Persistent channel */
 712                         if (set) {
 713                                 /* Only IRC operators are allowed to
 714                                  * set the 'P' channel mode! */
 715                                 if(is_oper || is_machine)
 716                                         x[0] = 'P';
 717                                 else
 718                                         connected = IRC_WriteStrClient(Origin,
 719                                                 ERR_NOPRIVILEGES_MSG,
 720                                                 Client_ID(Origin));
 721                         } else if(is_oper || is_machine || is_owner ||
 722                                   is_admin || is_op)
 723                                 x[0] = 'P';
 724                         else
 725                                 connected = IRC_WriteStrClient(Origin,
 726                                         ERR_CHANOPRIVSNEEDED_MSG,
 727                                         Client_ID(Origin),
 728                                         Channel_Name(Channel));
 729                         break;
 730                 /* --- Channel user modes --- */
 731                 case 'q': /* Owner */
 732                 case 'a': /* Channel admin */
 733                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 734                                 connected = IRC_WriteStrClient(Origin,
 735                                         ERR_CHANOPPRIVTOOLOW_MSG,
 736                                         Client_ID(Origin),
 737                                         Channel_Name(Channel));
 738                                 goto chan_exit;
 739                         }
 740                 case 'o': /* Channel operator */
 741                         if(!is_oper && !is_machine && !is_owner &&
 742                            !is_admin && !is_op) {
 743                                 connected = IRC_WriteStrClient(Origin,
 744                                         ERR_CHANOPRIVSNEEDED_MSG,
 745                                         Client_ID(Origin),
 746                                         Channel_Name(Channel));
 747                                 goto chan_exit;
 748                         }
 749                 case 'h': /* Half Op */
 750                         if(!is_oper && !is_machine && !is_owner &&
 751                            !is_admin && !is_op) {
 752                                 connected = IRC_WriteStrClient(Origin,
 753                                         ERR_CHANOPRIVSNEEDED_MSG,
 754                                         Client_ID(Origin),
 755                                         Channel_Name(Channel));
 756                                 goto chan_exit;
 757                         }
 758                 case 'v': /* Voice */
 759                         if (arg_arg > mode_arg) {
 760                                 if (is_oper || is_machine || is_owner ||
 761                                     is_admin || is_op || is_halfop) {
 762                                         client = Client_Search(Req->argv[arg_arg]);
 763                                         if (client)
 764                                                 x[0] = *mode_ptr;
 765                                         else
 766                                                 connected = IRC_WriteStrClient(Origin,
 767                                                         ERR_NOSUCHNICK_MSG,
 768                                                         Client_ID(Origin),
 769                                                         Req->argv[arg_arg]);
 770                                 } else {
 771                                         connected = IRC_WriteStrClient(Origin,
 772                                                 ERR_CHANOPRIVSNEEDED_MSG,
 773                                                 Client_ID(Origin),
 774                                                 Channel_Name(Channel));
 775                                 }
 776                                 Req->argv[arg_arg][0] = '\0';
 777                                 arg_arg++;
 778                         } else {
 779                                 connected = IRC_WriteStrClient(Origin,
 780                                         ERR_NEEDMOREPARAMS_MSG,
 781                                         Client_ID(Origin), Req->command);
 782                                 goto chan_exit;
 783                         }
 784                         break;
 785                 /* --- Channel lists --- */
 786                 case 'I': /* Invite lists */
 787                 case 'b': /* Ban lists */
 788                 case 'e': /* Channel exception lists */
 789                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 790                                 goto chan_exit;
 791                         if (arg_arg > mode_arg) {
 792                                 /* modify list */
 793                                 if (is_oper || is_machine || is_owner ||
 794                                     is_admin || is_op || is_halfop) {
 795                                         connected = set
 796                                            ? Add_To_List(*mode_ptr, Origin,
 797                                                 Client, Channel,
 798                                                 Req->argv[arg_arg])
 799                                            : Del_From_List(*mode_ptr, Origin,
 800                                                 Client, Channel,
 801                                                 Req->argv[arg_arg]);
 802                                 } else {
 803                                         connected = IRC_WriteStrClient(Origin,
 804                                                 ERR_CHANOPRIVSNEEDED_MSG,
 805                                                 Client_ID(Origin),
 806                                                 Channel_Name(Channel));
 807                                 }
 808                                 Req->argv[arg_arg][0] = '\0';
 809                                 arg_arg++;
 810                         } else {
 811                                 switch (*mode_ptr) {
 812                                 case 'I':
 813                                         Channel_ShowInvites(Origin, Channel);
 814                                         break;
 815                                 case 'b':
 816                                         Channel_ShowBans(Origin, Channel);
 817                                         break;
 818                                 case 'e':
 819                                         Channel_ShowExcepts(Origin, Channel);
 820                                         break;
 821                                 }
 822                         }
 823                         break;
 824                 default:
 825                         if (Client_Type(Client) != CLIENT_SERVER) {
 826                                 Log(LOG_DEBUG,
 827                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 828                                     set ? '+' : '-', *mode_ptr,
 829                                     Client_ID(Origin), Channel_Name(Channel));
 830                                 connected = IRC_WriteStrClient(Origin,
 831                                         ERR_UNKNOWNMODE_MSG,
 832                                         Client_ID(Origin), *mode_ptr,
 833                                         Channel_Name(Channel));
 834                                 x[0] = '\0';
 835                         } else {
 836                                 Log(LOG_DEBUG,
 837                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 838                                     set ? '+' : '-', *mode_ptr,
 839                                     Client_ID(Origin), Channel_Name(Channel));
 840                                 x[0] = *mode_ptr;
 841                         }
 842                 }
 843
 844                 if (!connected)
 845                         break;
 846
 847                 /* Is there a valid mode change? */
 848                 if (!x[0])
 849                         continue;
 850
 851                 /* Validate target client */
 852                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 853                         if (!IRC_WriteStrClient
 854                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 855                              Client_ID(Origin), Client_ID(client),
 856                              Channel_Name(Channel)))
 857                                 break;
 858
 859                         continue;
 860                 }
 861
 862                 if (client) {
 863                         /* Channel-User-Mode */
 864                         retval = set
 865                                ? Channel_UserModeAdd(Channel, client, x[0])
 866                                : Channel_UserModeDel(Channel, client, x[0]);
 867                         if (retval) {
 868                                 strlcat(the_args, " ", sizeof(the_args));
 869                                 strlcat(the_args, Client_ID(client),
 870                                         sizeof(the_args));
 871                                 strlcat(the_modes, x, sizeof(the_modes));
 872                                 LogDebug
 873                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 874                                      Client_Mask(client), Channel_Name(Channel),
 875                                      Channel_UserModes(Channel, client));
 876                         }
 877                 } else {
 878                         /* Channel-Mode */
 879                         retval = set
 880                                ? Channel_ModeAdd(Channel, x[0])
 881                                : Channel_ModeDel(Channel, x[0]);
 882                         if (retval) {
 883                                 strlcat(the_modes, x, sizeof(the_modes));
 884                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 885                                          Channel_Name(Channel),
 886                                          Channel_Modes(Channel));
 887                         }
 888                 }
 889
 890                 /* Are there additional arguments to add? */
 891                 if (argadd[0]) {
 892                         strlcat(the_args, " ", sizeof(the_args));
 893                         strlcat(the_args, argadd, sizeof(the_args));
 894                 }
 895         }
 896
 897       chan_exit:
 898         /* Are there changed modes? */
 899         if (the_modes[1]) {
 900                 /* Clean up mode string */
 901                 len = strlen(the_modes) - 1;
 902                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 903                         the_modes[len] = '\0';
 904
 905                 if (Client_Type(Client) == CLIENT_SERVER) {
 906                         /* MODE requests for local channels from other servers
 907                          * are definitely invalid! */
 908                         if (Channel_IsLocal(Channel)) {
 909                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 910                                 return CONNECTED;
 911                         }
 912
 913                         /* Forward mode changes to channel users and all the
 914                          * other remote servers: */
 915                         IRC_WriteStrServersPrefix(Client, Origin,
 916                                 "MODE %s %s%s", Channel_Name(Channel),
 917                                 the_modes, the_args);
 918                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 919                                 false, "MODE %s %s%s", Channel_Name(Channel),
 920                                 the_modes, the_args);
 921                 } else {
 922                         if (use_servermode)
 923                                 Origin = Client_ThisServer();
 924                         /* Send reply to client and inform other servers and channel users */
 925                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 926                                         "MODE %s %s%s", Channel_Name(Channel),
 927                                         the_modes, the_args);
 928                         /* Only forward requests for non-local channels */
 929                         if (!Channel_IsLocal(Channel))
 930                                 IRC_WriteStrServersPrefix(Client, Origin,
 931                                         "MODE %s %s%s", Channel_Name(Channel),
 932                                         the_modes, the_args);
 933                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 934                                 false, "MODE %s %s%s", Channel_Name(Channel),
 935                                 the_modes, the_args);
 936                 }
 937         }
 938
 939         IRC_SetPenalty(Client, 1);
 940         return connected;
 941 } /* Channel_Mode */
 942
 943
 944 GLOBAL bool
 945 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 946 {
 947         assert( Client != NULL );
 948         assert( Req != NULL );
 949
 950         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 951
 952         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 953         {
 954                 Client_SetAway( Client, Req->argv[0] );
 955                 Client_ModeAdd( Client, 'a' );
 956                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 957                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 958         }
 959         else
 960         {
 961                 Client_ModeDel( Client, 'a' );
 962                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 963                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 964         }
 965 } /* IRC_AWAY */
 966
 967
 968 /**
 969  * Add entries to channel invite, ban and exception lists.
 970  *
 971  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 972  * @param Prefix The originator of the command.
 973  * @param Client The sender of the command.
 974  * @param Channel The channel of which the list should be modified.
 975  * @param Pattern The pattern to add to the list.
 976  * @return CONNECTED or DISCONNECTED.
 977  */
 978 static bool
 979 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 980             const char *Pattern)
 981 {
 982         const char *mask;
 983         struct list_head *list = NULL;
 984         long int current_count;
 985
 986         assert(Client != NULL);
 987         assert(Channel != NULL);
 988         assert(Pattern != NULL);
 989         assert(what == 'I' || what == 'b' || what == 'e');
 990
 991         mask = Lists_MakeMask(Pattern);
 992         current_count = Lists_Count(Channel_GetListInvites(Channel))
 993                         + Lists_Count(Channel_GetListExcepts(Channel))
 994                         + Lists_Count(Channel_GetListBans(Channel));
 995
 996         switch(what) {
 997                 case 'I':
 998                         list = Channel_GetListInvites(Channel);
 999                         break;
1000                 case 'b':
1001                         list = Channel_GetListBans(Channel);
1002                         break;
1003                 case 'e':
1004                         list = Channel_GetListExcepts(Channel);
1005                         break;
1006         }
1007
1008         if (Lists_CheckDupeMask(list, mask))
1009                 return CONNECTED;
1010         if (Client_Type(Client) == CLIENT_USER &&
1011             current_count >= MAX_HNDL_CHANNEL_LISTS)
1012                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
1013                                           Client_ID(Client),
1014                                           Channel_Name(Channel), mask,
1015                                           MAX_HNDL_CHANNEL_LISTS);
1016
1017         switch (what) {
1018                 case 'I':
1019                         if (!Channel_AddInvite(Channel, mask, false))
1020                                 return CONNECTED;
1021                         break;
1022                 case 'b':
1023                         if (!Channel_AddBan(Channel, mask))
1024                                 return CONNECTED;
1025                         break;
1026                 case 'e':
1027                         if (!Channel_AddExcept(Channel, mask))
1028                                 return CONNECTED;
1029                         break;
1030         }
1031         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1032 }
1033
1034
1035 /**
1036  * Delete entries from channel invite, ban and exeption lists.
1037  *
1038  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1039  * @param Prefix The originator of the command.
1040  * @param Client The sender of the command.
1041  * @param Channel The channel of which the list should be modified.
1042  * @param Pattern The pattern to add to the list.
1043  * @return CONNECTED or DISCONNECTED.
1044  */
1045 static bool
1046 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1047               const char *Pattern)
1048 {
1049         const char *mask;
1050         struct list_head *list = NULL;
1051
1052         assert(Client != NULL);
1053         assert(Channel != NULL);
1054         assert(Pattern != NULL);
1055         assert(what == 'I' || what == 'b' || what == 'e');
1056
1057         mask = Lists_MakeMask(Pattern);
1058
1059         switch (what) {
1060                 case 'I':
1061                         list = Channel_GetListInvites(Channel);
1062                         break;
1063                 case 'b':
1064                         list = Channel_GetListBans(Channel);
1065                         break;
1066                 case 'e':
1067                         list = Channel_GetListExcepts(Channel);
1068                         break;
1069         }
1070
1071         if (!Lists_CheckDupeMask(list, mask))
1072                 return CONNECTED;
1073         Lists_Del(list, mask);
1074
1075         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1076 }
1077
1078
1079 /**
1080  * Send information about changed channel invite/ban/exception lists to clients.
1081  *
1082  * @param IsAdd true if the list item has been added, false otherwise.
1083  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1084  * @param Prefix The originator of the mode list change.
1085  * @param Client The sender of the command.
1086  * @param Channel The channel of which the list has been modified.
1087  * @param Mask The mask which has been added or removed.
1088  * @return CONNECTED or DISCONNECTED.
1089  */
1090 static bool
1091 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1092                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1093 {
1094         bool ok = true;
1095
1096         /* Send confirmation to the client */
1097         if (Client_Type(Client) == CLIENT_USER)
1098                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1099                                               Channel_Name(Channel),
1100                                               IsAdd ? '+' : '-',
1101                                               ModeChar, Mask);
1102
1103         /* to other servers */
1104         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1105                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1106                                   ModeChar, Mask);
1107
1108         /* and local users in channel */
1109         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1110                                   "MODE %s %c%c %s", Channel_Name(Channel),
1111                                   IsAdd ? '+' : '-', ModeChar, Mask );
1112
1113         return ok;
1114 } /* Send_ListChange */
1115
1116
1117 /* -eof- */