src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2014 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 's': /* Server messages */
 210                 case 'w': /* Wallops messages */
 211                         x[0] = *mode_ptr;
 212                         break;
 213                 case 'a': /* Away */
 214                         if (Client_Type(Client) == CLIENT_SERVER) {
 215                                 x[0] = 'a';
 216                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 217                         } else
 218                                 ok = IRC_WriteErrClient(Origin,
 219                                                         ERR_NOPRIVILEGES_MSG,
 220                                                         Client_ID(Origin));
 221                         break;
 222                 case 'B': /* Bot */
 223                         if (Client_HasMode(Client, 'r'))
 224                                 ok = IRC_WriteErrClient(Origin,
 225                                                         ERR_RESTRICTED_MSG,
 226                                                         Client_ID(Origin));
 227                         else
 228                                 x[0] = 'B';
 229                         break;
 230                 case 'c': /* Receive connect notices */
 231                 case 'q': /* KICK-protected user */
 232                 case 'F': /* disable flood protection */
 233                           /* (only settable by IRC operators!) */
 234                         if (!set || Client_Type(Client) == CLIENT_SERVER
 235                             || Client_HasMode(Origin, 'o'))
 236                                 x[0] = *mode_ptr;
 237                         else
 238                                 ok = IRC_WriteErrClient(Origin,
 239                                                         ERR_NOPRIVILEGES_MSG,
 240                                                         Client_ID(Origin));
 241                         break;
 242                 case 'o': /* IRC operator (only unsettable!) */
 243                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 244                                 x[0] = 'o';
 245                         } else
 246                                 ok = IRC_WriteErrClient(Origin,
 247                                                         ERR_NOPRIVILEGES_MSG,
 248                                                         Client_ID(Origin));
 249                         break;
 250                 case 'r': /* Restricted (only settable) */
 251                         if (set || Client_Type(Client) == CLIENT_SERVER)
 252                                 x[0] = 'r';
 253                         else
 254                                 ok = IRC_WriteErrClient(Origin,
 255                                                         ERR_RESTRICTED_MSG,
 256                                                         Client_ID(Origin));
 257                         break;
 258                 case 'R': /* Registered (not [un]settable by clients) */
 259                         if (Client_Type(Client) == CLIENT_SERVER)
 260                                 x[0] = 'R';
 261                         else
 262                                 ok = IRC_WriteErrClient(Origin,
 263                                                         ERR_NICKREGISTER_MSG,
 264                                                         Client_ID(Origin));
 265                         break;
 266                 case 'x': /* Cloak hostname */
 267                         if (Client_HasMode(Client, 'r'))
 268                                 ok = IRC_WriteErrClient(Origin,
 269                                                         ERR_RESTRICTED_MSG,
 270                                                         Client_ID(Origin));
 271                         else if (!set || Conf_CloakHostModeX[0]
 272                                  || Client_Type(Client) == CLIENT_SERVER
 273                                  || Client_HasMode(Origin, 'o')) {
 274                                 x[0] = 'x';
 275                                 send_RPL_HOSTHIDDEN_MSG = true;
 276                         } else
 277                                 ok = IRC_WriteErrClient(Origin,
 278                                                         ERR_NOPRIVILEGES_MSG,
 279                                                         Client_ID(Origin));
 280                         break;
 281                 default:
 282                         if (Client_Type(Client) != CLIENT_SERVER) {
 283                                 Log(LOG_DEBUG,
 284                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 285                                     set ? '+' : '-', *mode_ptr,
 286                                     Client_ID(Origin));
 287                                 ok = IRC_WriteErrClient(Origin,
 288                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 289                                                         Client_ID(Origin),
 290                                                         set ? '+' : '-',
 291                                                         *mode_ptr);
 292                                 x[0] = '\0';
 293                         } else {
 294                                 Log(LOG_DEBUG,
 295                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 296                                     set ? '+' : '-', *mode_ptr,
 297                                     Client_ID(Origin), Client_ID(Target));
 298                                 x[0] = *mode_ptr;
 299                         }
 300                 }
 301
 302                 if (!ok)
 303                         break;
 304
 305                 /* Is there a valid mode change? */
 306                 if (!x[0])
 307                         continue;
 308
 309                 if (set) {
 310                         if (Client_ModeAdd(Target, x[0]))
 311                                 strlcat(the_modes, x, sizeof(the_modes));
 312                 } else {
 313                         if (Client_ModeDel(Target, x[0]))
 314                                 strlcat(the_modes, x, sizeof(the_modes));
 315                 }
 316         }
 317
 318         /* Are there changed modes? */
 319         if (the_modes[1]) {
 320                 /* Remove needless action modifier characters */
 321                 len = strlen(the_modes) - 1;
 322                 if (the_modes[len] == '+' || the_modes[len] == '-')
 323                         the_modes[len] = '\0';
 324
 325                 if (Client_Type(Client) == CLIENT_SERVER) {
 326                         /* Forward modes to other servers */
 327                         if (Client_Conn(Target) != NONE) {
 328                                 /* Remote server (service?) changed modes
 329                                  * for one of our clients. Inform it! */
 330                                 IRC_WriteStrClientPrefix(Target, Origin,
 331                                                          "MODE %s :%s",
 332                                                          Client_ID(Target),
 333                                                          the_modes);
 334                         }
 335                         IRC_WriteStrServersPrefix(Client, Origin,
 336                                                   "MODE %s :%s",
 337                                                   Client_ID(Target),
 338                                                   the_modes);
 339                 } else {
 340                         /* Send reply to client and inform other servers */
 341                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 342                                                       "MODE %s :%s",
 343                                                       Client_ID(Target),
 344                                                       the_modes);
 345                         IRC_WriteStrServersPrefix(Client, Origin,
 346                                                   "MODE %s :%s",
 347                                                   Client_ID(Target),
 348                                                   the_modes);
 349                 }
 350
 351                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 352                         /* A new (cloaked) hostname must be announced */
 353                         IRC_WriteStrClientPrefix(Target, Origin,
 354                                                  RPL_HOSTHIDDEN_MSG,
 355                                                  Client_ID(Target),
 356                                                  Client_HostnameDisplayed(Target));
 357
 358                 }
 359
 360                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 361                          Client_TypeText(Target), Client_Mask(Target),
 362                          Client_Modes(Target));
 363         }
 364
 365         return ok;
 366 } /* Client_Mode */
 367
 368 /*
 369  * Reply to a channel mode request.
 370  *
 371  * @param Origin The originator of the MODE command (prefix).
 372  * @param Channel The channel of which the modes should be sent.
 373  * @return CONNECTED or DISCONNECTED.
 374  */
 375 static bool
 376 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 377 {
 378         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 379         const char *mode_ptr;
 380
 381         if (!Channel_IsMemberOf(Channel, Origin)) {
 382                 /* Not a member: "simple" mode reply */
 383                 if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 384                                         Client_ID(Origin), Channel_Name(Channel),
 385                                         Channel_Modes(Channel)))
 386                         return DISCONNECTED;
 387         } else {
 388                 /* The sender is a member: generate extended reply */
 389                 strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 390                 mode_ptr = the_modes;
 391                 the_args[0] = '\0';
 392
 393                 while(*mode_ptr) {
 394                         switch(*mode_ptr) {
 395                         case 'l':
 396                                 snprintf(argadd, sizeof(argadd), " %lu",
 397                                          Channel_MaxUsers(Channel));
 398                                 strlcat(the_args, argadd, sizeof(the_args));
 399                                 break;
 400                         case 'k':
 401                                 strlcat(the_args, " ", sizeof(the_args));
 402                                 strlcat(the_args, Channel_Key(Channel),
 403                                         sizeof(the_args));
 404                                 break;
 405                         }
 406                         mode_ptr++;
 407                 }
 408                 if (the_args[0])
 409                         strlcat(the_modes, the_args, sizeof(the_modes));
 410
 411                 if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 412                                         Client_ID(Origin), Channel_Name(Channel),
 413                                         the_modes))
 414                         return DISCONNECTED;
 415         }
 416
 417 #ifndef STRICT_RFC
 418         /* Channel creation time */
 419         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 420                                   Client_ID(Origin), Channel_Name(Channel),
 421                                   Channel_CreationTime(Channel)))
 422                 return DISCONNECTED;
 423 #endif
 424         return CONNECTED;
 425 }
 426
 427 /**
 428  * Handle channel mode and channel-user mode changes
 429  *
 430  * @param Client The client from which this command has been received.
 431  * @param Req Request structure with prefix and all parameters.
 432  * @param Origin The originator of the MODE command (prefix).
 433  * @param Channel The target channel of this MODE command.
 434  * @return CONNECTED or DISCONNECTED.
 435  */
 436 static bool
 437 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 438 {
 439         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 440             argadd[CLIENT_PASS_LEN], *mode_ptr;
 441         bool connected, set, skiponce, retval, use_servermode,
 442              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 443         int mode_arg, arg_arg, mode_arg_count = 0;
 444         CLIENT *client;
 445         long l;
 446         size_t len;
 447
 448         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 449
 450         if (Channel_IsModeless(Channel))
 451                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 452                                 Client_ID(Client), Channel_Name(Channel));
 453
 454         /* Mode request: let's answer it :-) */
 455         if (Req->argc <= 1)
 456                 return Channel_Mode_Answer_Request(Origin, Channel);
 457
 458         /* Check if origin is oper and opers can use mode */
 459         use_servermode = Conf_OperServerMode;
 460         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 461                 is_oper = true;
 462         }
 463
 464         /* Check if client is a server/service */
 465         if(Client_Type(Client) == CLIENT_SERVER ||
 466            Client_Type(Client) == CLIENT_SERVICE) {
 467                 is_machine = true;
 468         }
 469
 470         /* Check if client is member of channel or an oper or an server/service */
 471         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 472                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 473                                           Client_ID(Origin),
 474                                           Channel_Name(Channel));
 475
 476         mode_arg = 1;
 477         mode_ptr = Req->argv[mode_arg];
 478         if (Req->argc > mode_arg + 1)
 479                 arg_arg = mode_arg + 1;
 480         else
 481                 arg_arg = -1;
 482
 483         /* Initial state: set or unset modes? */
 484         skiponce = false;
 485         switch (*mode_ptr) {
 486         case '-':
 487                 set = false;
 488                 break;
 489         case '+':
 490                 set = true;
 491                 break;
 492         default:
 493                 set = true;
 494                 skiponce = true;
 495         }
 496
 497         /* Prepare reply string */
 498         strcpy(the_modes, set ? "+" : "-");
 499         the_args[0] = '\0';
 500
 501         x[1] = '\0';
 502         connected = CONNECTED;
 503         while (mode_ptr) {
 504                 if (!skiponce)
 505                         mode_ptr++;
 506                 if (!*mode_ptr) {
 507                         /* Try next argument if there's any */
 508                         if (arg_arg < 0)
 509                                 break;
 510                         if (arg_arg > mode_arg)
 511                                 mode_arg = arg_arg;
 512                         else
 513                                 mode_arg++;
 514
 515                         if (mode_arg >= Req->argc)
 516                                 break;
 517                         mode_ptr = Req->argv[mode_arg];
 518
 519                         if (Req->argc > mode_arg + 1)
 520                                 arg_arg = mode_arg + 1;
 521                         else
 522                                 arg_arg = -1;
 523                 }
 524                 skiponce = false;
 525
 526                 switch (*mode_ptr) {
 527                 case '+':
 528                 case '-':
 529                         if (((*mode_ptr == '+') && !set)
 530                             || ((*mode_ptr == '-') && set)) {
 531                                 /* Action modifier ("+"/"-") must be changed ... */
 532                                 len = strlen(the_modes) - 1;
 533                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 534                                         /* Adjust last action modifier in result */
 535                                         the_modes[len] = *mode_ptr;
 536                                 } else {
 537                                         /* Append modifier character to result string */
 538                                         x[0] = *mode_ptr;
 539                                         strlcat(the_modes, x, sizeof(the_modes));
 540                                 }
 541                                 set = *mode_ptr == '+';
 542                         }
 543                         continue;
 544                 }
 545
 546                 /* Are there arguments left? */
 547                 if (arg_arg >= Req->argc)
 548                         arg_arg = -1;
 549
 550                 if(!is_machine && !is_oper) {
 551                         if (Channel_UserHasMode(Channel, Client, 'q'))
 552                                 is_owner = true;
 553                         if (Channel_UserHasMode(Channel, Client, 'a'))
 554                                 is_admin = true;
 555                         if (Channel_UserHasMode(Channel, Client, 'o'))
 556                                 is_op = true;
 557                         if (Channel_UserHasMode(Channel, Client, 'h'))
 558                                 is_halfop = true;
 559                 }
 560
 561                 /* Validate modes */
 562                 x[0] = '\0';
 563                 argadd[0] = '\0';
 564                 client = NULL;
 565                 switch (*mode_ptr) {
 566                 /* --- Channel modes --- */
 567                 case 'R': /* Registered users only */
 568                 case 's': /* Secret channel */
 569                 case 'z': /* Secure connections only */
 570                         if(!is_oper && !is_machine && !is_owner &&
 571                            !is_admin && !is_op) {
 572                                 connected = IRC_WriteErrClient(Origin,
 573                                         ERR_CHANOPRIVSNEEDED_MSG,
 574                                         Client_ID(Origin), Channel_Name(Channel));
 575                                 goto chan_exit;
 576                         }
 577                 case 'i': /* Invite only */
 578                 case 'V': /* Invite disallow */
 579                 case 'M': /* Only identified nicks can write */
 580                 case 'm': /* Moderated */
 581                 case 'n': /* Only members can write */
 582                 case 'Q': /* No kicks */
 583                 case 't': /* Topic locked */
 584                         if(is_oper || is_machine || is_owner ||
 585                            is_admin || is_op || is_halfop)
 586                                 x[0] = *mode_ptr;
 587                         else
 588                                 connected = IRC_WriteErrClient(Origin,
 589                                         ERR_CHANOPRIVSNEEDED_MSG,
 590                                         Client_ID(Origin), Channel_Name(Channel));
 591                         break;
 592                 case 'k': /* Channel key */
 593                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 594                                 goto chan_exit;
 595                         if (!set) {
 596                                 if (is_oper || is_machine || is_owner ||
 597                                     is_admin || is_op || is_halfop) {
 598                                         x[0] = *mode_ptr;
 599                                         if (Channel_HasMode(Channel, 'k'))
 600                                                 strlcpy(argadd, "*", sizeof(argadd));
 601                                         if (arg_arg > mode_arg)
 602                                                 arg_arg++;
 603                                 } else
 604                                         connected = IRC_WriteErrClient(Origin,
 605                                                 ERR_CHANOPRIVSNEEDED_MSG,
 606                                                 Client_ID(Origin),
 607                                                 Channel_Name(Channel));
 608                                 break;
 609                         }
 610                         if (arg_arg > mode_arg) {
 611                                 if (is_oper || is_machine || is_owner ||
 612                                     is_admin || is_op || is_halfop) {
 613                                         Channel_ModeDel(Channel, 'k');
 614                                         Channel_SetKey(Channel,
 615                                                        Req->argv[arg_arg]);
 616                                         strlcpy(argadd, Channel_Key(Channel),
 617                                                 sizeof(argadd));
 618                                         x[0] = *mode_ptr;
 619                                 } else {
 620                                         connected = IRC_WriteErrClient(Origin,
 621                                                 ERR_CHANOPRIVSNEEDED_MSG,
 622                                                 Client_ID(Origin),
 623                                                 Channel_Name(Channel));
 624                                 }
 625                                 Req->argv[arg_arg][0] = '\0';
 626                                 arg_arg++;
 627                         } else {
 628 #ifdef STRICT_RFC
 629                                 /* Only send error message in "strict" mode,
 630                                  * this is how ircd2.11 and others behave ... */
 631                                 connected = IRC_WriteErrClient(Origin,
 632                                         ERR_NEEDMOREPARAMS_MSG,
 633                                         Client_ID(Origin), Req->command);
 634 #endif
 635                                 goto chan_exit;
 636                         }
 637                         break;
 638                 case 'l': /* Member limit */
 639                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 640                                 goto chan_exit;
 641                         if (!set) {
 642                                 if (is_oper || is_machine || is_owner ||
 643                                     is_admin || is_op || is_halfop)
 644                                         x[0] = *mode_ptr;
 645                                 else
 646                                         connected = IRC_WriteErrClient(Origin,
 647                                                 ERR_CHANOPRIVSNEEDED_MSG,
 648                                                 Client_ID(Origin),
 649                                                 Channel_Name(Channel));
 650                                 break;
 651                         }
 652                         if (arg_arg > mode_arg) {
 653                                 if (is_oper || is_machine || is_owner ||
 654                                     is_admin || is_op || is_halfop) {
 655                                         l = atol(Req->argv[arg_arg]);
 656                                         if (l > 0 && l < 0xFFFF) {
 657                                                 Channel_ModeDel(Channel, 'l');
 658                                                 Channel_SetMaxUsers(Channel, l);
 659                                                 snprintf(argadd, sizeof(argadd),
 660                                                          "%ld", l);
 661                                                 x[0] = *mode_ptr;
 662                                         }
 663                                 } else {
 664                                         connected = IRC_WriteErrClient(Origin,
 665                                                 ERR_CHANOPRIVSNEEDED_MSG,
 666                                                 Client_ID(Origin),
 667                                                 Channel_Name(Channel));
 668                                 }
 669                                 Req->argv[arg_arg][0] = '\0';
 670                                 arg_arg++;
 671                         } else {
 672 #ifdef STRICT_RFC
 673                                 /* Only send error message in "strict" mode,
 674                                  * this is how ircd2.11 and others behave ... */
 675                                 connected = IRC_WriteErrClient(Origin,
 676                                         ERR_NEEDMOREPARAMS_MSG,
 677                                         Client_ID(Origin), Req->command);
 678 #endif
 679                                 goto chan_exit;
 680                         }
 681                         break;
 682                 case 'O': /* IRC operators only */
 683                         if (set) {
 684                                 /* Only IRC operators are allowed to
 685                                  * set the 'O' channel mode! */
 686                                 if(is_oper || is_machine)
 687                                         x[0] = 'O';
 688                                 else
 689                                         connected = IRC_WriteErrClient(Origin,
 690                                                 ERR_NOPRIVILEGES_MSG,
 691                                                 Client_ID(Origin));
 692                         } else if(is_oper || is_machine || is_owner ||
 693                                   is_admin || is_op)
 694                                 x[0] = 'O';
 695                         else
 696                                 connected = IRC_WriteErrClient(Origin,
 697                                         ERR_CHANOPRIVSNEEDED_MSG,
 698                                         Client_ID(Origin),
 699                                         Channel_Name(Channel));
 700                         break;
 701                 case 'P': /* Persistent channel */
 702                         if (set) {
 703                                 /* Only IRC operators are allowed to
 704                                  * set the 'P' channel mode! */
 705                                 if(is_oper || is_machine)
 706                                         x[0] = 'P';
 707                                 else
 708                                         connected = IRC_WriteErrClient(Origin,
 709                                                 ERR_NOPRIVILEGES_MSG,
 710                                                 Client_ID(Origin));
 711                         } else if(is_oper || is_machine || is_owner ||
 712                                   is_admin || is_op)
 713                                 x[0] = 'P';
 714                         else
 715                                 connected = IRC_WriteErrClient(Origin,
 716                                         ERR_CHANOPRIVSNEEDED_MSG,
 717                                         Client_ID(Origin),
 718                                         Channel_Name(Channel));
 719                         break;
 720                 /* --- Channel user modes --- */
 721                 case 'q': /* Owner */
 722                 case 'a': /* Channel admin */
 723                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 724                                 connected = IRC_WriteErrClient(Origin,
 725                                         ERR_CHANOPPRIVTOOLOW_MSG,
 726                                         Client_ID(Origin),
 727                                         Channel_Name(Channel));
 728                                 goto chan_exit;
 729                         }
 730                 case 'o': /* Channel operator */
 731                         if(!is_oper && !is_machine && !is_owner &&
 732                            !is_admin && !is_op) {
 733                                 connected = IRC_WriteErrClient(Origin,
 734                                         ERR_CHANOPRIVSNEEDED_MSG,
 735                                         Client_ID(Origin),
 736                                         Channel_Name(Channel));
 737                                 goto chan_exit;
 738                         }
 739                 case 'h': /* Half Op */
 740                         if(!is_oper && !is_machine && !is_owner &&
 741                            !is_admin && !is_op) {
 742                                 connected = IRC_WriteErrClient(Origin,
 743                                         ERR_CHANOPRIVSNEEDED_MSG,
 744                                         Client_ID(Origin),
 745                                         Channel_Name(Channel));
 746                                 goto chan_exit;
 747                         }
 748                 case 'v': /* Voice */
 749                         if (arg_arg > mode_arg) {
 750                                 if (is_oper || is_machine || is_owner ||
 751                                     is_admin || is_op || is_halfop) {
 752                                         client = Client_Search(Req->argv[arg_arg]);
 753                                         if (client)
 754                                                 x[0] = *mode_ptr;
 755                                         else
 756                                                 connected = IRC_WriteErrClient(Origin,
 757                                                         ERR_NOSUCHNICK_MSG,
 758                                                         Client_ID(Origin),
 759                                                         Req->argv[arg_arg]);
 760                                 } else {
 761                                         connected = IRC_WriteErrClient(Origin,
 762                                                 ERR_CHANOPRIVSNEEDED_MSG,
 763                                                 Client_ID(Origin),
 764                                                 Channel_Name(Channel));
 765                                 }
 766                                 Req->argv[arg_arg][0] = '\0';
 767                                 arg_arg++;
 768                         } else {
 769 #ifdef STRICT_RFC
 770                                 /* Report an error to the client, when a user
 771                                  * mode should be changed but no nickname is
 772                                  * given. But don't do it when not in "strict"
 773                                  * mode, because most other servers don't do
 774                                  * it as well and some clients send "wired"
 775                                  * MODE commands like "MODE #chan -ooo nick". */
 776                                 connected = IRC_WriteErrClient(Origin,
 777                                         ERR_NEEDMOREPARAMS_MSG,
 778                                         Client_ID(Origin), Req->command);
 779 #endif
 780                                 goto chan_exit;
 781                         }
 782                         break;
 783                 /* --- Channel lists --- */
 784                 case 'I': /* Invite lists */
 785                 case 'b': /* Ban lists */
 786                 case 'e': /* Channel exception lists */
 787                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 788                                 goto chan_exit;
 789                         if (arg_arg > mode_arg) {
 790                                 /* modify list */
 791                                 if (is_oper || is_machine || is_owner ||
 792                                     is_admin || is_op || is_halfop) {
 793                                         connected = set
 794                                            ? Add_To_List(*mode_ptr, Origin,
 795                                                 Client, Channel,
 796                                                 Req->argv[arg_arg])
 797                                            : Del_From_List(*mode_ptr, Origin,
 798                                                 Client, Channel,
 799                                                 Req->argv[arg_arg]);
 800                                 } else {
 801                                         connected = IRC_WriteErrClient(Origin,
 802                                                 ERR_CHANOPRIVSNEEDED_MSG,
 803                                                 Client_ID(Origin),
 804                                                 Channel_Name(Channel));
 805                                 }
 806                                 Req->argv[arg_arg][0] = '\0';
 807                                 arg_arg++;
 808                         } else {
 809                                 switch (*mode_ptr) {
 810                                 case 'I':
 811                                         Channel_ShowInvites(Origin, Channel);
 812                                         break;
 813                                 case 'b':
 814                                         Channel_ShowBans(Origin, Channel);
 815                                         break;
 816                                 case 'e':
 817                                         Channel_ShowExcepts(Origin, Channel);
 818                                         break;
 819                                 }
 820                         }
 821                         break;
 822                 default:
 823                         if (Client_Type(Client) != CLIENT_SERVER) {
 824                                 Log(LOG_DEBUG,
 825                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 826                                     set ? '+' : '-', *mode_ptr,
 827                                     Client_ID(Origin), Channel_Name(Channel));
 828                                 connected = IRC_WriteErrClient(Origin,
 829                                         ERR_UNKNOWNMODE_MSG,
 830                                         Client_ID(Origin), *mode_ptr,
 831                                         Channel_Name(Channel));
 832                                 x[0] = '\0';
 833                         } else {
 834                                 Log(LOG_DEBUG,
 835                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 836                                     set ? '+' : '-', *mode_ptr,
 837                                     Client_ID(Origin), Channel_Name(Channel));
 838                                 x[0] = *mode_ptr;
 839                         }
 840                 }
 841
 842                 if (!connected)
 843                         break;
 844
 845                 /* Is there a valid mode change? */
 846                 if (!x[0])
 847                         continue;
 848
 849                 /* Validate target client */
 850                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 851                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 852                                                 Client_ID(Origin),
 853                                                 Client_ID(client),
 854                                                 Channel_Name(Channel)))
 855                                 break;
 856                         continue;
 857                 }
 858
 859                 if (client) {
 860                         /* Channel-User-Mode */
 861                         retval = set
 862                                ? Channel_UserModeAdd(Channel, client, x[0])
 863                                : Channel_UserModeDel(Channel, client, x[0]);
 864                         if (retval) {
 865                                 strlcat(the_args, " ", sizeof(the_args));
 866                                 strlcat(the_args, Client_ID(client),
 867                                         sizeof(the_args));
 868                                 strlcat(the_modes, x, sizeof(the_modes));
 869                                 LogDebug
 870                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 871                                      Client_Mask(client), Channel_Name(Channel),
 872                                      Channel_UserModes(Channel, client));
 873                         }
 874                 } else {
 875                         /* Channel-Mode */
 876                         retval = set
 877                                ? Channel_ModeAdd(Channel, x[0])
 878                                : Channel_ModeDel(Channel, x[0]);
 879                         if (retval) {
 880                                 strlcat(the_modes, x, sizeof(the_modes));
 881                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 882                                          Channel_Name(Channel),
 883                                          Channel_Modes(Channel));
 884                         }
 885                 }
 886
 887                 /* Are there additional arguments to add? */
 888                 if (argadd[0]) {
 889                         strlcat(the_args, " ", sizeof(the_args));
 890                         strlcat(the_args, argadd, sizeof(the_args));
 891                 }
 892         }
 893
 894       chan_exit:
 895         /* Are there changed modes? */
 896         if (the_modes[1]) {
 897                 /* Clean up mode string */
 898                 len = strlen(the_modes) - 1;
 899                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 900                         the_modes[len] = '\0';
 901
 902                 if (Client_Type(Client) == CLIENT_SERVER) {
 903                         /* MODE requests for local channels from other servers
 904                          * are definitely invalid! */
 905                         if (Channel_IsLocal(Channel)) {
 906                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 907                                 return CONNECTED;
 908                         }
 909
 910                         /* Forward mode changes to channel users and all the
 911                          * other remote servers: */
 912                         IRC_WriteStrServersPrefix(Client, Origin,
 913                                 "MODE %s %s%s", Channel_Name(Channel),
 914                                 the_modes, the_args);
 915                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 916                                 false, "MODE %s %s%s", Channel_Name(Channel),
 917                                 the_modes, the_args);
 918                 } else {
 919                         if (use_servermode)
 920                                 Origin = Client_ThisServer();
 921                         /* Send reply to client and inform other servers and channel users */
 922                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 923                                         "MODE %s %s%s", Channel_Name(Channel),
 924                                         the_modes, the_args);
 925                         /* Only forward requests for non-local channels */
 926                         if (!Channel_IsLocal(Channel))
 927                                 IRC_WriteStrServersPrefix(Client, Origin,
 928                                         "MODE %s %s%s", Channel_Name(Channel),
 929                                         the_modes, the_args);
 930                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 931                                 false, "MODE %s %s%s", Channel_Name(Channel),
 932                                 the_modes, the_args);
 933                 }
 934         }
 935
 936         return connected;
 937 } /* Channel_Mode */
 938
 939 /**
 940  * Handler for the IRC "AWAY" command.
 941  *
 942  * @param Client The client from which this command has been received.
 943  * @param Req Request structure with prefix and all parameters.
 944  * @return CONNECTED or DISCONNECTED.
 945  */
 946 GLOBAL bool
 947 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 948 {
 949         assert (Client != NULL);
 950         assert (Req != NULL);
 951
 952         if (Req->argc == 1 && Req->argv[0][0]) {
 953                 Client_SetAway(Client, Req->argv[0]);
 954                 Client_ModeAdd(Client, 'a');
 955                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 956                                           Client_ID( Client));
 957                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 958                                           Client_ID( Client));
 959         } else {
 960                 Client_ModeDel(Client, 'a');
 961                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 962                                           Client_ID( Client));
 963                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 964                                           Client_ID( Client));
 965         }
 966 } /* IRC_AWAY */
 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         char mask[MASK_LEN];
 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         Lists_MakeMask(Pattern, mask, sizeof(mask));
 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_WriteErrClient(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  * Delete entries from channel invite, ban and exception lists.
1036  *
1037  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1038  * @param Prefix The originator of the command.
1039  * @param Client The sender of the command.
1040  * @param Channel The channel of which the list should be modified.
1041  * @param Pattern The pattern to add to the list.
1042  * @return CONNECTED or DISCONNECTED.
1043  */
1044 static bool
1045 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1046               const char *Pattern)
1047 {
1048         char mask[MASK_LEN];
1049         struct list_head *list = NULL;
1050
1051         assert(Client != NULL);
1052         assert(Channel != NULL);
1053         assert(Pattern != NULL);
1054         assert(what == 'I' || what == 'b' || what == 'e');
1055
1056         Lists_MakeMask(Pattern, mask, sizeof(mask));
1057
1058         switch (what) {
1059                 case 'I':
1060                         list = Channel_GetListInvites(Channel);
1061                         break;
1062                 case 'b':
1063                         list = Channel_GetListBans(Channel);
1064                         break;
1065                 case 'e':
1066                         list = Channel_GetListExcepts(Channel);
1067                         break;
1068         }
1069
1070         if (!Lists_CheckDupeMask(list, mask))
1071                 return CONNECTED;
1072         Lists_Del(list, mask);
1073
1074         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1075 }
1076
1077 /**
1078  * Send information about changed channel invite/ban/exception lists to clients.
1079  *
1080  * @param IsAdd true if the list item has been added, false otherwise.
1081  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1082  * @param Prefix The originator of the mode list change.
1083  * @param Client The sender of the command.
1084  * @param Channel The channel of which the list has been modified.
1085  * @param Mask The mask which has been added or removed.
1086  * @return CONNECTED or DISCONNECTED.
1087  */
1088 static bool
1089 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1090                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1091 {
1092         bool ok = true;
1093
1094         /* Send confirmation to the client */
1095         if (Client_Type(Client) == CLIENT_USER)
1096                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1097                                               Channel_Name(Channel),
1098                                               IsAdd ? '+' : '-',
1099                                               ModeChar, Mask);
1100
1101         /* to other servers */
1102         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1103                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1104                                   ModeChar, Mask);
1105
1106         /* and local users in channel */
1107         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1108                                   "MODE %s %c%c %s", Channel_Name(Channel),
1109                                   IsAdd ? '+' : '-', ModeChar, Mask );
1110
1111         return ok;
1112 } /* Send_ListChange */
1113
1114 /* -eof- */