src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2023 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 <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include "conn.h"
  25 #include "channel.h"
  26 #include "irc-macros.h"
  27 #include "irc-write.h"
  28 #include "lists.h"
  29 #include "log.h"
  30 #include "parse.h"
  31 #include "messages.h"
  32 #include "conf.h"
  33
  34 #include "irc-mode.h"
  35
  36 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  37                                 CLIENT *Target));
  38 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  39                                  CHANNEL *Channel));
  40
  41 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  42                                 CHANNEL *Channel, const char *Pattern));
  43 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  44                                   CHANNEL *Channel, const char *Pattern));
  45
  46 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  47                                     CLIENT *Prefix, CLIENT *Client,
  48                                     CHANNEL *Channel, const char *Mask));
  49
  50 /**
  51  * Handler for the IRC "MODE" command.
  52  *
  53  * This function detects whether user or channel modes should be modified
  54  * and calls the appropriate sub-functions.
  55  *
  56  * @param Client The client from which this command has been received.
  57  * @param Req Request structure with prefix and all parameters.
  58  * @return CONNECTED or DISCONNECTED.
  59  */
  60 GLOBAL bool
  61 IRC_MODE( CLIENT *Client, REQUEST *Req )
  62 {
  63         CLIENT *cl, *origin;
  64         CHANNEL *chan;
  65
  66         assert(Client != NULL);
  67         assert(Req != NULL);
  68
  69         _IRC_GET_SENDER_OR_RETURN_(origin, Req, Client)
  70
  71         /* Test for "fake" MODE commands injected by this local instance,
  72          * for example when handling the "DefaultUserModes" settings.
  73          * This doesn't harm real commands, because prefixes of regular
  74          * clients are checked in Validate_Prefix() and can't be faked. */
  75         if (Req->prefix && Client_Search(Req->prefix) == Client_ThisServer())
  76                 Client = Client_Search(Req->prefix);
  77
  78         /* Channel or user mode? */
  79         cl = NULL; chan = NULL;
  80         if (Client_IsValidNick(Req->argv[0]))
  81                 cl = Client_Search(Req->argv[0]);
  82         if (Channel_IsValidName(Req->argv[0]))
  83                 chan = Channel_Search(Req->argv[0]);
  84
  85         if (cl)
  86                 return Client_Mode(Client, Req, origin, cl);
  87         if (chan)
  88                 return Channel_Mode(Client, Req, origin, chan);
  89
  90         /* No target found! */
  91         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
  92                         Client_ID(Client), Req->argv[0]);
  93 } /* IRC_MODE */
  94
  95 /**
  96  * Check if the "mode limit" for a client has been reached.
  97  *
  98  * This limit doesn't apply for servers or services!
  99  *
 100  * @param Client The client to check.
 101  * @param Count The number of modes already handled.
 102  * @return true if the limit has been reached.
 103  */
 104 static bool
 105 Mode_Limit_Reached(CLIENT *Client, int Count)
 106 {
 107         if (Client_Type(Client) == CLIENT_SERVER
 108             || Client_Type(Client) == CLIENT_SERVICE)
 109                 return false;
 110         if (Count < MAX_HNDL_MODES_ARG)
 111                 return false;
 112         return true;
 113 }
 114
 115 /**
 116  * Handle client mode requests
 117  *
 118  * @param Client The client from which this command has been received.
 119  * @param Req Request structure with prefix and all parameters.
 120  * @param Origin The originator of the MODE command (prefix).
 121  * @param Target The target (client) of this MODE command.
 122  * @return CONNECTED or DISCONNECTED.
 123  */
 124 static bool
 125 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 126 {
 127         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 128         bool ok, set;
 129         bool send_RPL_HOSTHIDDEN_MSG = false;
 130         int mode_arg;
 131         size_t len;
 132
 133         /* Is the client allowed to request or change the modes? */
 134         if (Client_Type(Client) == CLIENT_USER) {
 135                 /* Users are only allowed to manipulate their own modes! */
 136                 if (Target != Client)
 137                         return IRC_WriteErrClient(Client,
 138                                                   ERR_USERSDONTMATCH_MSG,
 139                                                   Client_ID(Client));
 140         }
 141
 142         /* Mode request: let's answer it :-) */
 143         if (Req->argc == 1)
 144                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 145                                           Client_ID(Target),
 146                                           Client_Modes(Target));
 147
 148         mode_arg = 1;
 149         mode_ptr = Req->argv[mode_arg];
 150
 151         /* Initial state: set or unset modes? */
 152         if (*mode_ptr == '+') {
 153                 set = true;
 154                 strcpy(the_modes, "+");
 155         } else if (*mode_ptr == '-') {
 156                 set = false;
 157                 strcpy(the_modes, "-");
 158         } else
 159                 return IRC_WriteErrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 160                                           Client_ID(Origin));
 161
 162         x[1] = '\0';
 163         ok = CONNECTED;
 164         while (mode_ptr) {
 165                 mode_ptr++;
 166                 if (!*mode_ptr) {
 167                         /* Try next argument if there's any */
 168                         mode_arg++;
 169                         if (mode_arg < Req->argc)
 170                                 mode_ptr = Req->argv[mode_arg];
 171                         else
 172                                 break;
 173                 }
 174
 175                 switch(*mode_ptr) {
 176                   case '+':
 177                   case '-':
 178                         if ((*mode_ptr == '+' && !set)
 179                             || (*mode_ptr == '-' && set)) {
 180                                 /* Action modifier ("+"/"-") must be changed */
 181                                 len = strlen(the_modes) - 1;
 182                                 if (the_modes[len] == '+'
 183                                     || the_modes[len] == '-') {
 184                                         /* Last character in the "result
 185                                          * string" was an "action", so just
 186                                          * overwrite it with the new action */
 187                                         the_modes[len] = *mode_ptr;
 188                                 } else {
 189                                         /* Append new modifier character to
 190                                          * the resulting mode string */
 191                                         x[0] = *mode_ptr;
 192                                         strlcat(the_modes, x,
 193                                                 sizeof(the_modes));
 194                                 }
 195                                 if (*mode_ptr == '+')
 196                                         set = true;
 197                                 else
 198                                         set = false;
 199                         }
 200                         continue;
 201                 }
 202
 203                 /* Validate modes */
 204                 x[0] = '\0';
 205                 switch (*mode_ptr) {
 206                 case 'b': /* Block private msgs */
 207                 case 'C': /* Only messages from clients sharing a channel */
 208                 case 'i': /* Invisible */
 209                 case 'I': /* Hide channel list from WHOIS */
 210                 case 's': /* Server messages */
 211                 case 'w': /* Wallops messages */
 212                         x[0] = *mode_ptr;
 213                         break;
 214                 case 'a': /* Away */
 215                         if (Client_Type(Client) == CLIENT_SERVER) {
 216                                 x[0] = 'a';
 217                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 218                         } else
 219                                 ok = IRC_WriteErrClient(Origin,
 220                                                         ERR_NOPRIVILEGES_MSG,
 221                                                         Client_ID(Origin));
 222                         break;
 223                 case 'B': /* Bot */
 224                         if (Client_HasMode(Client, 'r'))
 225                                 ok = IRC_WriteErrClient(Origin,
 226                                                         ERR_RESTRICTED_MSG,
 227                                                         Client_ID(Origin));
 228                         else
 229                                 x[0] = 'B';
 230                         break;
 231                 case 'c': /* Receive connect notices */
 232                 case 'q': /* KICK-protected user */
 233                 case 'F': /* disable flood protection */
 234                           /* (only settable by IRC operators!) */
 235                         if (!set || Client_Type(Client) == CLIENT_SERVER
 236                             || Client_HasMode(Origin, 'o'))
 237                                 x[0] = *mode_ptr;
 238                         else
 239                                 ok = IRC_WriteErrClient(Origin,
 240                                                         ERR_NOPRIVILEGES_MSG,
 241                                                         Client_ID(Origin));
 242                         break;
 243                 case 'o': /* IRC operator (only unsettable!) */
 244                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 245                                 x[0] = 'o';
 246                         } else
 247                                 ok = IRC_WriteErrClient(Origin,
 248                                                         ERR_NOPRIVILEGES_MSG,
 249                                                         Client_ID(Origin));
 250                         break;
 251                 case 'r': /* Restricted (only settable) */
 252                         if (set || Client_Type(Client) == CLIENT_SERVER)
 253                                 x[0] = 'r';
 254                         else
 255                                 ok = IRC_WriteErrClient(Origin,
 256                                                         ERR_RESTRICTED_MSG,
 257                                                         Client_ID(Origin));
 258                         break;
 259                 case 'R': /* Registered (not [un]settable by clients) */
 260                         if (Client_Type(Client) == CLIENT_SERVER)
 261                                 x[0] = 'R';
 262                         else
 263                                 ok = IRC_WriteErrClient(Origin,
 264                                                         ERR_NICKREGISTER_MSG,
 265                                                         Client_ID(Origin));
 266                         break;
 267                 case 'x': /* Cloak hostname */
 268                         if (Client_HasMode(Client, 'r'))
 269                                 ok = IRC_WriteErrClient(Origin,
 270                                                         ERR_RESTRICTED_MSG,
 271                                                         Client_ID(Origin));
 272                         else if (!set || Conf_CloakHostModeX[0]
 273                                  || Client_Type(Client) == CLIENT_SERVER
 274                                  || Client_HasMode(Origin, 'o')) {
 275                                 x[0] = 'x';
 276                                 send_RPL_HOSTHIDDEN_MSG = true;
 277                         } else
 278                                 ok = IRC_WriteErrClient(Origin,
 279                                                         ERR_NOPRIVILEGES_MSG,
 280                                                         Client_ID(Origin));
 281                         break;
 282                 default:
 283                         if (Client_Type(Client) != CLIENT_SERVER) {
 284                                 LogDebug(
 285                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 286                                     set ? '+' : '-', *mode_ptr,
 287                                     Client_ID(Origin));
 288                                 ok = IRC_WriteErrClient(Origin,
 289                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 290                                                         Client_ID(Origin),
 291                                                         set ? '+' : '-',
 292                                                         *mode_ptr);
 293                                 x[0] = '\0';
 294                         } else {
 295                                 LogDebug(
 296                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 297                                     set ? '+' : '-', *mode_ptr,
 298                                     Client_ID(Origin), Client_ID(Target));
 299                                 x[0] = *mode_ptr;
 300                         }
 301                 }
 302
 303                 if (!ok)
 304                         break;
 305
 306                 /* Is there a valid mode change? */
 307                 if (!x[0])
 308                         continue;
 309
 310                 if (set) {
 311                         if (Client_ModeAdd(Target, x[0]))
 312                                 strlcat(the_modes, x, sizeof(the_modes));
 313                 } else {
 314                         if (Client_ModeDel(Target, x[0]))
 315                                 strlcat(the_modes, x, sizeof(the_modes));
 316                 }
 317         }
 318
 319         /* Are there changed modes? */
 320         if (the_modes[1]) {
 321                 /* Remove needless action modifier characters */
 322                 len = strlen(the_modes) - 1;
 323                 if (the_modes[len] == '+' || the_modes[len] == '-')
 324                         the_modes[len] = '\0';
 325
 326                 if (Client_Type(Client) == CLIENT_SERVER) {
 327                         /* Forward modes to other servers */
 328                         if (Client_Conn(Target) != NONE) {
 329                                 /* Remote server (service?) changed modes
 330                                  * for one of our clients. Inform it! */
 331                                 IRC_WriteStrClientPrefix(Target, Origin,
 332                                                          "MODE %s :%s",
 333                                                          Client_ID(Target),
 334                                                          the_modes);
 335                         }
 336                         IRC_WriteStrServersPrefix(Client, Origin,
 337                                                   "MODE %s :%s",
 338                                                   Client_ID(Target),
 339                                                   the_modes);
 340                 } else {
 341                         /* Send reply to client and inform other servers */
 342                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 343                                                       "MODE %s :%s",
 344                                                       Client_ID(Target),
 345                                                       the_modes);
 346                         IRC_WriteStrServersPrefix(Client, Origin,
 347                                                   "MODE %s :%s",
 348                                                   Client_ID(Target),
 349                                                   the_modes);
 350                 }
 351
 352                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 353                         /* A new (cloaked) hostname must be announced */
 354                         IRC_WriteStrClientPrefix(Target, Origin,
 355                                                  RPL_HOSTHIDDEN_MSG,
 356                                                  Client_ID(Target),
 357                                                  Client_HostnameDisplayed(Target));
 358
 359                 }
 360
 361                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 362                          Client_TypeText(Target), Client_Mask(Target),
 363                          Client_Modes(Target));
 364         }
 365
 366         return ok;
 367 } /* Client_Mode */
 368
 369 /*
 370  * Reply to a channel mode request.
 371  *
 372  * @param Origin The originator of the MODE command (prefix).
 373  * @param Channel The channel of which the modes should be sent.
 374  * @return CONNECTED or DISCONNECTED.
 375  */
 376 static bool
 377 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 378 {
 379         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 380         const char *mode_ptr;
 381
 382         if (!Channel_IsMemberOf(Channel, Origin)) {
 383                 /* Not a member: "simple" mode reply */
 384                 if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 385                                         Client_ID(Origin), Channel_Name(Channel),
 386                                         Channel_Modes(Channel)))
 387                         return DISCONNECTED;
 388         } else {
 389                 /* The sender is a member: generate extended reply */
 390                 strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 391                 mode_ptr = the_modes;
 392                 the_args[0] = '\0';
 393
 394                 while(*mode_ptr) {
 395                         switch(*mode_ptr) {
 396                         case 'l':
 397                                 snprintf(argadd, sizeof(argadd), " %lu",
 398                                          Channel_MaxUsers(Channel));
 399                                 strlcat(the_args, argadd, sizeof(the_args));
 400                                 break;
 401                         case 'k':
 402                                 strlcat(the_args, " ", sizeof(the_args));
 403                                 strlcat(the_args, Channel_Key(Channel),
 404                                         sizeof(the_args));
 405                                 break;
 406                         }
 407                         mode_ptr++;
 408                 }
 409                 if (the_args[0])
 410                         strlcat(the_modes, the_args, sizeof(the_modes));
 411
 412                 if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 413                                         Client_ID(Origin), Channel_Name(Channel),
 414                                         the_modes))
 415                         return DISCONNECTED;
 416         }
 417
 418 #ifndef STRICT_RFC
 419         /* Channel creation time */
 420         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 421                                   Client_ID(Origin), Channel_Name(Channel),
 422                                   Channel_CreationTime(Channel)))
 423                 return DISCONNECTED;
 424 #endif
 425         return CONNECTED;
 426 }
 427
 428 /**
 429  * Handle channel mode and channel-user mode changes
 430  *
 431  * @param Client The client from which this command has been received.
 432  * @param Req Request structure with prefix and all parameters.
 433  * @param Origin The originator of the MODE command (prefix).
 434  * @param Channel The target channel of this MODE command.
 435  * @return CONNECTED or DISCONNECTED.
 436  */
 437 static bool
 438 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 439 {
 440         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 441             argadd[CLIENT_PASS_LEN], *mode_ptr;
 442         bool connected, set, skiponce, retval, use_servermode,
 443              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 444         int mode_arg, arg_arg, mode_arg_count = 0;
 445         CLIENT *client;
 446         long l;
 447         size_t len;
 448
 449         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 450
 451         if (Channel_IsModeless(Channel))
 452                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 453                                 Client_ID(Client), Channel_Name(Channel));
 454
 455         /* Mode request: let's answer it :-) */
 456         if (Req->argc <= 1)
 457                 return Channel_Mode_Answer_Request(Origin, Channel);
 458
 459         /* Check if origin is oper and opers can use mode */
 460         use_servermode = Conf_OperServerMode;
 461         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 462                 is_oper = true;
 463         }
 464
 465         /* Check if client is a server/service */
 466         if(Client_Type(Client) == CLIENT_SERVER ||
 467            Client_Type(Client) == CLIENT_SERVICE) {
 468                 is_machine = true;
 469         }
 470
 471         /* Check if client is member of channel or an oper or an server/service */
 472         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 473                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 474                                           Client_ID(Origin),
 475                                           Channel_Name(Channel));
 476
 477         mode_arg = 1;
 478         mode_ptr = Req->argv[mode_arg];
 479         if (Req->argc > mode_arg + 1)
 480                 arg_arg = mode_arg + 1;
 481         else
 482                 arg_arg = -1;
 483
 484         /* Initial state: set or unset modes? */
 485         skiponce = false;
 486         switch (*mode_ptr) {
 487         case '-':
 488                 set = false;
 489                 break;
 490         case '+':
 491                 set = true;
 492                 break;
 493         default:
 494                 set = true;
 495                 skiponce = true;
 496         }
 497
 498         /* Prepare reply string */
 499         strcpy(the_modes, set ? "+" : "-");
 500         the_args[0] = '\0';
 501
 502         x[1] = '\0';
 503         connected = CONNECTED;
 504         while (mode_ptr) {
 505                 if (!skiponce)
 506                         mode_ptr++;
 507                 if (!*mode_ptr) {
 508                         /* Try next argument if there's any */
 509                         if (arg_arg < 0)
 510                                 break;
 511                         if (arg_arg > mode_arg)
 512                                 mode_arg = arg_arg;
 513                         else
 514                                 mode_arg++;
 515
 516                         if (mode_arg >= Req->argc)
 517                                 break;
 518                         mode_ptr = Req->argv[mode_arg];
 519
 520                         if (Req->argc > mode_arg + 1)
 521                                 arg_arg = mode_arg + 1;
 522                         else
 523                                 arg_arg = -1;
 524                 }
 525                 skiponce = false;
 526
 527                 switch (*mode_ptr) {
 528                 case '+':
 529                 case '-':
 530                         if (((*mode_ptr == '+') && !set)
 531                             || ((*mode_ptr == '-') && set)) {
 532                                 /* Action modifier ("+"/"-") must be changed ... */
 533                                 len = strlen(the_modes) - 1;
 534                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 535                                         /* Adjust last action modifier in result */
 536                                         the_modes[len] = *mode_ptr;
 537                                 } else {
 538                                         /* Append modifier character to result string */
 539                                         x[0] = *mode_ptr;
 540                                         strlcat(the_modes, x, sizeof(the_modes));
 541                                 }
 542                                 set = *mode_ptr == '+';
 543                         }
 544                         continue;
 545                 }
 546
 547                 /* Are there arguments left? */
 548                 if (arg_arg >= Req->argc)
 549                         arg_arg = -1;
 550
 551                 if(!is_machine && !is_oper) {
 552                         if (Channel_UserHasMode(Channel, Client, 'q'))
 553                                 is_owner = true;
 554                         if (Channel_UserHasMode(Channel, Client, 'a'))
 555                                 is_admin = true;
 556                         if (Channel_UserHasMode(Channel, Client, 'o'))
 557                                 is_op = true;
 558                         if (Channel_UserHasMode(Channel, Client, 'h'))
 559                                 is_halfop = true;
 560                 }
 561
 562                 /* Validate modes */
 563                 x[0] = '\0';
 564                 argadd[0] = '\0';
 565                 client = NULL;
 566                 switch (*mode_ptr) {
 567                 /* --- Channel modes --- */
 568                 case 'R': /* Registered users only */
 569                 case 's': /* Secret channel */
 570                 case 'z': /* Secure connections only */
 571                         if(!is_oper && !is_machine && !is_owner &&
 572                            !is_admin && !is_op) {
 573                                 connected = IRC_WriteErrClient(Origin,
 574                                         ERR_CHANOPRIVSNEEDED_MSG,
 575                                         Client_ID(Origin), Channel_Name(Channel));
 576                                 goto chan_exit;
 577                         }
 578                         /* fall through */
 579                 case 'i': /* Invite only */
 580                 case 'V': /* Invite disallow */
 581                 case 'M': /* Only identified nicks can write */
 582                 case 'm': /* Moderated */
 583                 case 'n': /* Only members can write */
 584                 case 'N': /* Can't change nick while on this channel */
 585                 case 'Q': /* No kicks */
 586                 case 't': /* Topic locked */
 587                         if(is_oper || is_machine || is_owner ||
 588                            is_admin || is_op || is_halfop)
 589                                 x[0] = *mode_ptr;
 590                         else
 591                                 connected = IRC_WriteErrClient(Origin,
 592                                         ERR_CHANOPRIVSNEEDED_MSG,
 593                                         Client_ID(Origin), Channel_Name(Channel));
 594                         break;
 595                 case 'k': /* Channel key */
 596                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 597                                 goto chan_exit;
 598                         if (!set) {
 599                                 if (is_oper || is_machine || is_owner ||
 600                                     is_admin || is_op || is_halfop) {
 601                                         x[0] = *mode_ptr;
 602                                         if (Channel_HasMode(Channel, 'k'))
 603                                                 strlcpy(argadd, "*", sizeof(argadd));
 604                                         if (arg_arg > mode_arg)
 605                                                 arg_arg++;
 606                                 } else
 607                                         connected = IRC_WriteErrClient(Origin,
 608                                                 ERR_CHANOPRIVSNEEDED_MSG,
 609                                                 Client_ID(Origin),
 610                                                 Channel_Name(Channel));
 611                                 break;
 612                         }
 613                         if (arg_arg <= mode_arg) {
 614                                 if (is_machine)
 615                                         Log(LOG_ERR,
 616                                             "Got MODE +k without key for \"%s\" from \"%s\"! Ignored.",
 617                                             Channel_Name(Channel), Client_ID(Origin));
 618                                 else
 619                                         connected = IRC_WriteErrClient(Origin,
 620                                                 ERR_NEEDMOREPARAMS_MSG,
 621                                                 Client_ID(Origin), Req->command);
 622                                 goto chan_exit;
 623                         }
 624                         if (!Req->argv[arg_arg][0] || strchr(Req->argv[arg_arg], ' ')) {
 625                                 if (is_machine)
 626                                         Log(LOG_ERR,
 627                                             "Got invalid key on MODE +k for \"%s\" from \"%s\"! Ignored.",
 628                                             Channel_Name(Channel), Client_ID(Origin));
 629                                 else
 630                                         connected = IRC_WriteErrClient(Origin,
 631                                                ERR_INVALIDMODEPARAM_MSG,
 632                                                 Client_ID(Origin),
 633                                                 Channel_Name(Channel), 'k');
 634                                 goto chan_exit;
 635                         }
 636                         if (is_oper || is_machine || is_owner ||
 637                             is_admin || is_op || is_halfop) {
 638                                 Channel_ModeDel(Channel, 'k');
 639                                 Channel_SetKey(Channel, Req->argv[arg_arg]);
 640                                 strlcpy(argadd, Channel_Key(Channel), sizeof(argadd));
 641                                 x[0] = *mode_ptr;
 642                         } else {
 643                                 connected = IRC_WriteErrClient(Origin,
 644                                         ERR_CHANOPRIVSNEEDED_MSG,
 645                                         Client_ID(Origin),
 646                                         Channel_Name(Channel));
 647                         }
 648                         Req->argv[arg_arg][0] = '\0';
 649                         arg_arg++;
 650                         break;
 651                 case 'l': /* Member limit */
 652                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 653                                 goto chan_exit;
 654                         if (!set) {
 655                                 if (is_oper || is_machine || is_owner ||
 656                                     is_admin || is_op || is_halfop)
 657                                         x[0] = *mode_ptr;
 658                                 else
 659                                         connected = IRC_WriteErrClient(Origin,
 660                                                 ERR_CHANOPRIVSNEEDED_MSG,
 661                                                 Client_ID(Origin),
 662                                                 Channel_Name(Channel));
 663                                 break;
 664                         }
 665                         if (arg_arg <= mode_arg) {
 666                                 if (is_machine)
 667                                         Log(LOG_ERR,
 668                                             "Got MODE +l without limit for \"%s\" from \"%s\"! Ignored.",
 669                                             Channel_Name(Channel), Client_ID(Origin));
 670                                 else
 671                                         connected = IRC_WriteErrClient(Origin,
 672                                                 ERR_NEEDMOREPARAMS_MSG,
 673                                                 Client_ID(Origin), Req->command);
 674                                 goto chan_exit;
 675                         }
 676                         l = atol(Req->argv[arg_arg]);
 677                         if (l <= 0 || l >= 0xFFFF) {
 678                                 if (is_machine)
 679                                         Log(LOG_ERR,
 680                                             "Got MODE +l with invalid limit for \"%s\" from \"%s\"! Ignored.",
 681                                             Channel_Name(Channel), Client_ID(Origin));
 682                                 else
 683                                         connected = IRC_WriteErrClient(Origin,
 684                                                 ERR_INVALIDMODEPARAM_MSG,
 685                                                 Client_ID(Origin),
 686                                                 Channel_Name(Channel), 'l');
 687                                 goto chan_exit;
 688                         }
 689                         if (is_oper || is_machine || is_owner ||
 690                             is_admin || is_op || is_halfop) {
 691                                 Channel_ModeDel(Channel, 'l');
 692                                 Channel_SetMaxUsers(Channel, l);
 693                                 snprintf(argadd, sizeof(argadd), "%ld", l);
 694                                 x[0] = *mode_ptr;
 695                         } else {
 696                                 connected = IRC_WriteErrClient(Origin,
 697                                         ERR_CHANOPRIVSNEEDED_MSG,
 698                                         Client_ID(Origin),
 699                                         Channel_Name(Channel));
 700                         }
 701                         Req->argv[arg_arg][0] = '\0';
 702                         arg_arg++;
 703                         break;
 704                 case 'O': /* IRC operators only */
 705                         if (set) {
 706                                 /* Only IRC operators are allowed to
 707                                  * set the 'O' channel mode! */
 708                                 if(is_oper || is_machine)
 709                                         x[0] = 'O';
 710                                 else
 711                                         connected = IRC_WriteErrClient(Origin,
 712                                                 ERR_NOPRIVILEGES_MSG,
 713                                                 Client_ID(Origin));
 714                         } else if(is_oper || is_machine || is_owner ||
 715                                   is_admin || is_op)
 716                                 x[0] = 'O';
 717                         else
 718                                 connected = IRC_WriteErrClient(Origin,
 719                                         ERR_CHANOPRIVSNEEDED_MSG,
 720                                         Client_ID(Origin),
 721                                         Channel_Name(Channel));
 722                         break;
 723                 case 'P': /* Persistent channel */
 724                         if (set) {
 725                                 /* Only IRC operators are allowed to
 726                                  * set the 'P' channel mode! */
 727                                 if(is_oper || is_machine)
 728                                         x[0] = 'P';
 729                                 else
 730                                         connected = IRC_WriteErrClient(Origin,
 731                                                 ERR_NOPRIVILEGES_MSG,
 732                                                 Client_ID(Origin));
 733                         } else if(is_oper || is_machine || is_owner ||
 734                                   is_admin || is_op)
 735                                 x[0] = 'P';
 736                         else
 737                                 connected = IRC_WriteErrClient(Origin,
 738                                         ERR_CHANOPRIVSNEEDED_MSG,
 739                                         Client_ID(Origin),
 740                                         Channel_Name(Channel));
 741                         break;
 742                 /* --- Channel user modes --- */
 743                 case 'q': /* Owner */
 744                         if(!is_oper && !is_machine && !is_owner) {
 745                                 connected = IRC_WriteErrClient(Origin,
 746                                         ERR_CHANOPPRIVTOOLOW_MSG,
 747                                         Client_ID(Origin),
 748                                         Channel_Name(Channel));
 749                                 goto chan_exit;
 750                         }
 751                         /* fall through */
 752                 case 'a': /* Channel admin */
 753                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 754                                 connected = IRC_WriteErrClient(Origin,
 755                                         ERR_CHANOPPRIVTOOLOW_MSG,
 756                                         Client_ID(Origin),
 757                                         Channel_Name(Channel));
 758                                 goto chan_exit;
 759                         }
 760                         /* fall through */
 761                 case 'o': /* Channel operator */
 762                         if(!is_oper && !is_machine && !is_owner &&
 763                            !is_admin && !is_op) {
 764                                 connected = IRC_WriteErrClient(Origin,
 765                                         ERR_CHANOPRIVSNEEDED_MSG,
 766                                         Client_ID(Origin),
 767                                         Channel_Name(Channel));
 768                                 goto chan_exit;
 769                         }
 770                         /* fall through */
 771                 case 'h': /* Half Op */
 772                         if(!is_oper && !is_machine && !is_owner &&
 773                            !is_admin && !is_op) {
 774                                 connected = IRC_WriteErrClient(Origin,
 775                                         ERR_CHANOPRIVSNEEDED_MSG,
 776                                         Client_ID(Origin),
 777                                         Channel_Name(Channel));
 778                                 goto chan_exit;
 779                         }
 780                         /* fall through */
 781                 case 'v': /* Voice */
 782                         if (arg_arg > mode_arg) {
 783                                 if (is_oper || is_machine || is_owner ||
 784                                     is_admin || is_op || is_halfop) {
 785                                         client = Client_Search(Req->argv[arg_arg]);
 786                                         if (client)
 787                                                 x[0] = *mode_ptr;
 788                                         else
 789                                                 connected = IRC_WriteErrClient(Origin,
 790                                                         ERR_NOSUCHNICK_MSG,
 791                                                         Client_ID(Origin),
 792                                                         Req->argv[arg_arg]);
 793                                 } else {
 794                                         connected = IRC_WriteErrClient(Origin,
 795                                                 ERR_CHANOPRIVSNEEDED_MSG,
 796                                                 Client_ID(Origin),
 797                                                 Channel_Name(Channel));
 798                                 }
 799                                 Req->argv[arg_arg][0] = '\0';
 800                                 arg_arg++;
 801                         } else {
 802 #ifdef STRICT_RFC
 803                                 /* Report an error to the client, when a user
 804                                  * mode should be changed but no nickname is
 805                                  * given. But don't do it when not in "strict"
 806                                  * mode, because most other servers don't do
 807                                  * it as well and some clients send "wired"
 808                                  * MODE commands like "MODE #chan -ooo nick". */
 809                                 connected = IRC_WriteErrClient(Origin,
 810                                         ERR_NEEDMOREPARAMS_MSG,
 811                                         Client_ID(Origin), Req->command);
 812 #endif
 813                                 goto chan_exit;
 814                         }
 815                         break;
 816                 /* --- Channel lists --- */
 817                 case 'I': /* Invite lists */
 818                 case 'b': /* Ban lists */
 819                 case 'e': /* Channel exception lists */
 820                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 821                                 goto chan_exit;
 822                         if (arg_arg > mode_arg) {
 823                                 /* modify list */
 824                                 if (is_oper || is_machine || is_owner ||
 825                                     is_admin || is_op || is_halfop) {
 826                                         connected = set
 827                                            ? Add_To_List(*mode_ptr, Origin,
 828                                                 Client, Channel,
 829                                                 Req->argv[arg_arg])
 830                                            : Del_From_List(*mode_ptr, Origin,
 831                                                 Client, Channel,
 832                                                 Req->argv[arg_arg]);
 833                                 } else {
 834                                         connected = IRC_WriteErrClient(Origin,
 835                                                 ERR_CHANOPRIVSNEEDED_MSG,
 836                                                 Client_ID(Origin),
 837                                                 Channel_Name(Channel));
 838                                 }
 839                                 Req->argv[arg_arg][0] = '\0';
 840                                 arg_arg++;
 841                         } else {
 842                                 switch (*mode_ptr) {
 843                                 case 'I':
 844                                         Channel_ShowInvites(Origin, Channel);
 845                                         break;
 846                                 case 'b':
 847                                         Channel_ShowBans(Origin, Channel);
 848                                         break;
 849                                 case 'e':
 850                                         Channel_ShowExcepts(Origin, Channel);
 851                                         break;
 852                                 }
 853                         }
 854                         break;
 855                 default:
 856                         if (Client_Type(Client) != CLIENT_SERVER) {
 857                                 LogDebug(
 858                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 859                                     set ? '+' : '-', *mode_ptr,
 860                                     Client_ID(Origin), Channel_Name(Channel));
 861                                 connected = IRC_WriteErrClient(Origin,
 862                                         ERR_UNKNOWNMODE_MSG,
 863                                         Client_ID(Origin), *mode_ptr,
 864                                         Channel_Name(Channel));
 865                                 x[0] = '\0';
 866                         } else {
 867                                 LogDebug(
 868                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 869                                     set ? '+' : '-', *mode_ptr,
 870                                     Client_ID(Origin), Channel_Name(Channel));
 871                                 x[0] = *mode_ptr;
 872                         }
 873                 }
 874
 875                 if (!connected)
 876                         break;
 877
 878                 /* Is there a valid mode change? */
 879                 if (!x[0])
 880                         continue;
 881
 882                 /* Validate target client */
 883                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 884                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 885                                                 Client_ID(Origin),
 886                                                 Client_ID(client),
 887                                                 Channel_Name(Channel)))
 888                                 break;
 889                         continue;
 890                 }
 891
 892                 if (client) {
 893                         /* Channel-User-Mode */
 894                         retval = set
 895                                ? Channel_UserModeAdd(Channel, client, x[0])
 896                                : Channel_UserModeDel(Channel, client, x[0]);
 897                         if (retval) {
 898                                 strlcat(the_args, " ", sizeof(the_args));
 899                                 strlcat(the_args, Client_ID(client),
 900                                         sizeof(the_args));
 901                                 strlcat(the_modes, x, sizeof(the_modes));
 902                                 LogDebug
 903                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 904                                      Client_Mask(client), Channel_Name(Channel),
 905                                      Channel_UserModes(Channel, client));
 906                         }
 907                 } else {
 908                         /* Channel-Mode */
 909                         retval = set
 910                                ? Channel_ModeAdd(Channel, x[0])
 911                                : Channel_ModeDel(Channel, x[0]);
 912                         if (retval) {
 913                                 strlcat(the_modes, x, sizeof(the_modes));
 914                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 915                                          Channel_Name(Channel),
 916                                          Channel_Modes(Channel));
 917                         }
 918                 }
 919
 920                 /* Are there additional arguments to add? */
 921                 if (argadd[0]) {
 922                         strlcat(the_args, " ", sizeof(the_args));
 923                         strlcat(the_args, argadd, sizeof(the_args));
 924                 }
 925         }
 926
 927       chan_exit:
 928         /* Are there changed modes? */
 929         if (the_modes[1]) {
 930                 /* Clean up mode string */
 931                 len = strlen(the_modes) - 1;
 932                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 933                         the_modes[len] = '\0';
 934
 935                 if (Client_Type(Client) == CLIENT_SERVER) {
 936                         /* MODE requests for local channels from other servers
 937                          * are definitely invalid! */
 938                         if (Channel_IsLocal(Channel) && Client != Client_ThisServer()) {
 939                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 940                                 return CONNECTED;
 941                         }
 942
 943                         /* Forward mode changes to channel users and all the
 944                          * other remote servers: */
 945                         IRC_WriteStrServersPrefix(Client, Origin,
 946                                 "MODE %s %s%s", Channel_Name(Channel),
 947                                 the_modes, the_args);
 948                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 949                                 false, "MODE %s %s%s", Channel_Name(Channel),
 950                                 the_modes, the_args);
 951                 } else {
 952                         if (use_servermode)
 953                                 Origin = Client_ThisServer();
 954                         /* Send reply to client and inform other servers and channel users */
 955                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 956                                         "MODE %s %s%s", Channel_Name(Channel),
 957                                         the_modes, the_args);
 958                         /* Only forward requests for non-local channels */
 959                         if (!Channel_IsLocal(Channel))
 960                                 IRC_WriteStrServersPrefix(Client, Origin,
 961                                         "MODE %s %s%s", Channel_Name(Channel),
 962                                         the_modes, the_args);
 963                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 964                                 false, "MODE %s %s%s", Channel_Name(Channel),
 965                                 the_modes, the_args);
 966                 }
 967         }
 968
 969         return connected;
 970 } /* Channel_Mode */
 971
 972 /**
 973  * Handler for the IRC "AWAY" command.
 974  *
 975  * @param Client The client from which this command has been received.
 976  * @param Req Request structure with prefix and all parameters.
 977  * @return CONNECTED or DISCONNECTED.
 978  */
 979 GLOBAL bool
 980 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 981 {
 982         assert (Client != NULL);
 983         assert (Req != NULL);
 984
 985         if (Req->argc == 1 && Req->argv[0][0]) {
 986                 Client_SetAway(Client, Req->argv[0]);
 987                 Client_ModeAdd(Client, 'a');
 988                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 989                                           Client_ID( Client));
 990                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 991                                           Client_ID( Client));
 992         } else {
 993                 Client_ModeDel(Client, 'a');
 994                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 995                                           Client_ID( Client));
 996                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 997                                           Client_ID( Client));
 998         }
 999 } /* IRC_AWAY */
1000
1001 /**
1002  * Add entries to channel invite, ban and exception lists.
1003  *
1004  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1005  * @param Prefix The originator of the command.
1006  * @param Client The sender of the command.
1007  * @param Channel The channel of which the list should be modified.
1008  * @param Pattern The pattern to add to the list.
1009  * @return CONNECTED or DISCONNECTED.
1010  */
1011 static bool
1012 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1013             const char *Pattern)
1014 {
1015         char mask[MASK_LEN];
1016         struct list_head *list = NULL;
1017         long int current_count;
1018
1019         assert(Client != NULL);
1020         assert(Channel != NULL);
1021         assert(Pattern != NULL);
1022         assert(what == 'I' || what == 'b' || what == 'e');
1023
1024         Lists_MakeMask(Pattern, mask, sizeof(mask));
1025         current_count = Lists_Count(Channel_GetListInvites(Channel))
1026                         + Lists_Count(Channel_GetListExcepts(Channel))
1027                         + Lists_Count(Channel_GetListBans(Channel));
1028
1029         switch(what) {
1030                 case 'I':
1031                         list = Channel_GetListInvites(Channel);
1032                         break;
1033                 case 'b':
1034                         list = Channel_GetListBans(Channel);
1035                         break;
1036                 case 'e':
1037                         list = Channel_GetListExcepts(Channel);
1038                         break;
1039         }
1040
1041         if (Lists_CheckDupeMask(list, mask))
1042                 return CONNECTED;
1043         if (Client_Type(Client) == CLIENT_USER &&
1044             current_count >= MAX_HNDL_CHANNEL_LISTS)
1045                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
1046                                           Client_ID(Client),
1047                                           Channel_Name(Channel), mask,
1048                                           MAX_HNDL_CHANNEL_LISTS);
1049
1050         switch (what) {
1051                 case 'I':
1052                         if (!Channel_AddInvite(Channel, mask, false, Client_ID(Client)))
1053                                 return CONNECTED;
1054                         break;
1055                 case 'b':
1056                         if (!Channel_AddBan(Channel, mask, Client_ID(Client)))
1057                                 return CONNECTED;
1058                         break;
1059                 case 'e':
1060                         if (!Channel_AddExcept(Channel, mask, Client_ID(Client)))
1061                                 return CONNECTED;
1062                         break;
1063         }
1064         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1065 }
1066
1067 /**
1068  * Delete entries from channel invite, ban and exception lists.
1069  *
1070  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1071  * @param Prefix The originator of the command.
1072  * @param Client The sender of the command.
1073  * @param Channel The channel of which the list should be modified.
1074  * @param Pattern The pattern to add to the list.
1075  * @return CONNECTED or DISCONNECTED.
1076  */
1077 static bool
1078 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1079               const char *Pattern)
1080 {
1081         char mask[MASK_LEN];
1082         struct list_head *list = NULL;
1083
1084         assert(Client != NULL);
1085         assert(Channel != NULL);
1086         assert(Pattern != NULL);
1087         assert(what == 'I' || what == 'b' || what == 'e');
1088
1089         Lists_MakeMask(Pattern, mask, sizeof(mask));
1090
1091         switch (what) {
1092                 case 'I':
1093                         list = Channel_GetListInvites(Channel);
1094                         break;
1095                 case 'b':
1096                         list = Channel_GetListBans(Channel);
1097                         break;
1098                 case 'e':
1099                         list = Channel_GetListExcepts(Channel);
1100                         break;
1101         }
1102
1103         if (!Lists_CheckDupeMask(list, mask))
1104                 return CONNECTED;
1105         Lists_Del(list, mask);
1106
1107         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1108 }
1109
1110 /**
1111  * Send information about changed channel invite/ban/exception lists to clients.
1112  *
1113  * @param IsAdd true if the list item has been added, false otherwise.
1114  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1115  * @param Prefix The originator of the mode list change.
1116  * @param Client The sender of the command.
1117  * @param Channel The channel of which the list has been modified.
1118  * @param Mask The mask which has been added or removed.
1119  * @return CONNECTED or DISCONNECTED.
1120  */
1121 static bool
1122 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1123                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1124 {
1125         bool ok = true;
1126
1127         /* Send confirmation to the client */
1128         if (Client_Type(Client) == CLIENT_USER)
1129                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1130                                               Channel_Name(Channel),
1131                                               IsAdd ? '+' : '-',
1132                                               ModeChar, Mask);
1133
1134         /* to other servers */
1135         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1136                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1137                                   ModeChar, Mask);
1138
1139         /* and local users in channel */
1140         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1141                                   "MODE %s %c%c %s", Channel_Name(Channel),
1142                                   IsAdd ? '+' : '-', ModeChar, Mask );
1143
1144         return ok;
1145 } /* Send_ListChange */
1146
1147 /* -eof- */