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         /* Channel or user mode? */
  72         cl = NULL; chan = NULL;
  73         if (Client_IsValidNick(Req->argv[0]))
  74                 cl = Client_Search(Req->argv[0]);
  75         if (Channel_IsValidName(Req->argv[0]))
  76                 chan = Channel_Search(Req->argv[0]);
  77
  78         if (cl)
  79                 return Client_Mode(Client, Req, origin, cl);
  80         if (chan)
  81                 return Channel_Mode(Client, Req, origin, chan);
  82
  83         /* No target found! */
  84         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
  85                         Client_ID(Client), Req->argv[0]);
  86 } /* IRC_MODE */
  87
  88 /**
  89  * Check if the "mode limit" for a client has been reached.
  90  *
  91  * This limit doesn't apply for servers or services!
  92  *
  93  * @param Client The client to check.
  94  * @param Count The number of modes already handled.
  95  * @return true if the limit has been reached.
  96  */
  97 static bool
  98 Mode_Limit_Reached(CLIENT *Client, int Count)
  99 {
 100         if (Client_Type(Client) == CLIENT_SERVER
 101             || Client_Type(Client) == CLIENT_SERVICE)
 102                 return false;
 103         if (Count < MAX_HNDL_MODES_ARG)
 104                 return false;
 105         return true;
 106 }
 107
 108 /**
 109  * Handle client mode requests
 110  *
 111  * @param Client The client from which this command has been received.
 112  * @param Req Request structure with prefix and all parameters.
 113  * @param Origin The originator of the MODE command (prefix).
 114  * @param Target The target (client) of this MODE command.
 115  * @return CONNECTED or DISCONNECTED.
 116  */
 117 static bool
 118 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 119 {
 120         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 121         bool ok, set;
 122         bool send_RPL_HOSTHIDDEN_MSG = false;
 123         int mode_arg;
 124         size_t len;
 125
 126         /* Is the client allowed to request or change the modes? */
 127         if (Client_Type(Client) == CLIENT_USER) {
 128                 /* Users are only allowed to manipulate their own modes! */
 129                 if (Target != Client)
 130                         return IRC_WriteErrClient(Client,
 131                                                   ERR_USERSDONTMATCH_MSG,
 132                                                   Client_ID(Client));
 133         }
 134
 135         /* Mode request: let's answer it :-) */
 136         if (Req->argc == 1)
 137                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 138                                           Client_ID(Target),
 139                                           Client_Modes(Target));
 140
 141         mode_arg = 1;
 142         mode_ptr = Req->argv[mode_arg];
 143
 144         /* Initial state: set or unset modes? */
 145         if (*mode_ptr == '+') {
 146                 set = true;
 147                 strcpy(the_modes, "+");
 148         } else if (*mode_ptr == '-') {
 149                 set = false;
 150                 strcpy(the_modes, "-");
 151         } else
 152                 return IRC_WriteErrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 153                                           Client_ID(Origin));
 154
 155         x[1] = '\0';
 156         ok = CONNECTED;
 157         while (mode_ptr) {
 158                 mode_ptr++;
 159                 if (!*mode_ptr) {
 160                         /* Try next argument if there's any */
 161                         mode_arg++;
 162                         if (mode_arg < Req->argc)
 163                                 mode_ptr = Req->argv[mode_arg];
 164                         else
 165                                 break;
 166                 }
 167
 168                 switch(*mode_ptr) {
 169                   case '+':
 170                   case '-':
 171                         if ((*mode_ptr == '+' && !set)
 172                             || (*mode_ptr == '-' && set)) {
 173                                 /* Action modifier ("+"/"-") must be changed */
 174                                 len = strlen(the_modes) - 1;
 175                                 if (the_modes[len] == '+'
 176                                     || the_modes[len] == '-') {
 177                                         /* Last character in the "result
 178                                          * string" was an "action", so just
 179                                          * overwrite it with the new action */
 180                                         the_modes[len] = *mode_ptr;
 181                                 } else {
 182                                         /* Append new modifier character to
 183                                          * the resulting mode string */
 184                                         x[0] = *mode_ptr;
 185                                         strlcat(the_modes, x,
 186                                                 sizeof(the_modes));
 187                                 }
 188                                 if (*mode_ptr == '+')
 189                                         set = true;
 190                                 else
 191                                         set = false;
 192                         }
 193                         continue;
 194                 }
 195
 196                 /* Validate modes */
 197                 x[0] = '\0';
 198                 switch (*mode_ptr) {
 199                 case 'b': /* Block private msgs */
 200                 case 'C': /* Only messages from clients sharing a channel */
 201                 case 'i': /* Invisible */
 202                 case 's': /* Server messages */
 203                 case 'w': /* Wallops messages */
 204                         x[0] = *mode_ptr;
 205                         break;
 206                 case 'a': /* Away */
 207                         if (Client_Type(Client) == CLIENT_SERVER) {
 208                                 x[0] = 'a';
 209                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 210                         } else
 211                                 ok = IRC_WriteErrClient(Origin,
 212                                                         ERR_NOPRIVILEGES_MSG,
 213                                                         Client_ID(Origin));
 214                         break;
 215                 case 'B': /* Bot */
 216                         if (Client_HasMode(Client, 'r'))
 217                                 ok = IRC_WriteErrClient(Origin,
 218                                                         ERR_RESTRICTED_MSG,
 219                                                         Client_ID(Origin));
 220                         else
 221                                 x[0] = 'B';
 222                         break;
 223                 case 'c': /* Receive connect notices */
 224                 case 'q': /* KICK-protected user */
 225                           /* (only settable by IRC operators!) */
 226                         if (!set || Client_Type(Client) == CLIENT_SERVER
 227                             || Client_HasMode(Origin, 'o'))
 228                                 x[0] = *mode_ptr;
 229                         else
 230                                 ok = IRC_WriteErrClient(Origin,
 231                                                         ERR_NOPRIVILEGES_MSG,
 232                                                         Client_ID(Origin));
 233                         break;
 234                 case 'o': /* IRC operator (only unsettable!) */
 235                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 236                                 x[0] = 'o';
 237                         } else
 238                                 ok = IRC_WriteErrClient(Origin,
 239                                                         ERR_NOPRIVILEGES_MSG,
 240                                                         Client_ID(Origin));
 241                         break;
 242                 case 'r': /* Restricted (only settable) */
 243                         if (set || Client_Type(Client) == CLIENT_SERVER)
 244                                 x[0] = 'r';
 245                         else
 246                                 ok = IRC_WriteErrClient(Origin,
 247                                                         ERR_RESTRICTED_MSG,
 248                                                         Client_ID(Origin));
 249                         break;
 250                 case 'R': /* Registered (not [un]settable by clients) */
 251                         if (Client_Type(Client) == CLIENT_SERVER)
 252                                 x[0] = 'R';
 253                         else
 254                                 ok = IRC_WriteErrClient(Origin,
 255                                                         ERR_NICKREGISTER_MSG,
 256                                                         Client_ID(Origin));
 257                         break;
 258                 case 'x': /* Cloak hostname */
 259                         if (Client_HasMode(Client, 'r'))
 260                                 ok = IRC_WriteErrClient(Origin,
 261                                                         ERR_RESTRICTED_MSG,
 262                                                         Client_ID(Origin));
 263                         else if (!set || Conf_CloakHostModeX[0]
 264                                  || Client_Type(Client) == CLIENT_SERVER
 265                                  || Client_HasMode(Origin, 'o')) {
 266                                 x[0] = 'x';
 267                                 send_RPL_HOSTHIDDEN_MSG = true;
 268                         } else
 269                                 ok = IRC_WriteErrClient(Origin,
 270                                                         ERR_NOPRIVILEGES_MSG,
 271                                                         Client_ID(Origin));
 272                         break;
 273                 default:
 274                         if (Client_Type(Client) != CLIENT_SERVER) {
 275                                 Log(LOG_DEBUG,
 276                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 277                                     set ? '+' : '-', *mode_ptr,
 278                                     Client_ID(Origin));
 279                                 ok = IRC_WriteErrClient(Origin,
 280                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 281                                                         Client_ID(Origin),
 282                                                         set ? '+' : '-',
 283                                                         *mode_ptr);
 284                                 x[0] = '\0';
 285                         } else {
 286                                 Log(LOG_DEBUG,
 287                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 288                                     set ? '+' : '-', *mode_ptr,
 289                                     Client_ID(Origin), Client_ID(Target));
 290                                 x[0] = *mode_ptr;
 291                         }
 292                 }
 293
 294                 if (!ok)
 295                         break;
 296
 297                 /* Is there a valid mode change? */
 298                 if (!x[0])
 299                         continue;
 300
 301                 if (set) {
 302                         if (Client_ModeAdd(Target, x[0]))
 303                                 strlcat(the_modes, x, sizeof(the_modes));
 304                 } else {
 305                         if (Client_ModeDel(Target, x[0]))
 306                                 strlcat(the_modes, x, sizeof(the_modes));
 307                 }
 308         }
 309
 310         /* Are there changed modes? */
 311         if (the_modes[1]) {
 312                 /* Remove needless action modifier characters */
 313                 len = strlen(the_modes) - 1;
 314                 if (the_modes[len] == '+' || the_modes[len] == '-')
 315                         the_modes[len] = '\0';
 316
 317                 if (Client_Type(Client) == CLIENT_SERVER) {
 318                         /* Forward modes to other servers */
 319                         if (Client_Conn(Target) != NONE) {
 320                                 /* Remote server (service?) changed modes
 321                                  * for one of our clients. Inform it! */
 322                                 IRC_WriteStrClientPrefix(Target, Origin,
 323                                                          "MODE %s :%s",
 324                                                          Client_ID(Target),
 325                                                          the_modes);
 326                         }
 327                         IRC_WriteStrServersPrefix(Client, Origin,
 328                                                   "MODE %s :%s",
 329                                                   Client_ID(Target),
 330                                                   the_modes);
 331                 } else {
 332                         /* Send reply to client and inform other servers */
 333                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 334                                                       "MODE %s :%s",
 335                                                       Client_ID(Target),
 336                                                       the_modes);
 337                         IRC_WriteStrServersPrefix(Client, Origin,
 338                                                   "MODE %s :%s",
 339                                                   Client_ID(Target),
 340                                                   the_modes);
 341                 }
 342
 343                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 344                         /* A new (cloaked) hostname must be announced */
 345                         IRC_WriteStrClientPrefix(Target, Origin,
 346                                                  RPL_HOSTHIDDEN_MSG,
 347                                                  Client_ID(Target),
 348                                                  Client_HostnameDisplayed(Target));
 349
 350                 }
 351
 352                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 353                          Client_TypeText(Target), Client_Mask(Target),
 354                          Client_Modes(Target));
 355         }
 356
 357         return ok;
 358 } /* Client_Mode */
 359
 360 /*
 361  * Reply to a channel mode request.
 362  *
 363  * @param Origin The originator of the MODE command (prefix).
 364  * @param Channel The channel of which the modes should be sent.
 365  * @return CONNECTED or DISCONNECTED.
 366  */
 367 static bool
 368 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 369 {
 370         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 371         const char *mode_ptr;
 372
 373         /* Member or not? -- That's the question! */
 374         if (!Channel_IsMemberOf(Channel, Origin))
 375                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 376                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 377
 378         /* The sender is a member: generate extended reply */
 379         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 380         mode_ptr = the_modes;
 381         the_args[0] = '\0';
 382
 383         while(*mode_ptr) {
 384                 switch(*mode_ptr) {
 385                 case 'l':
 386                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 387                         strlcat(the_args, argadd, sizeof(the_args));
 388                         break;
 389                 case 'k':
 390                         strlcat(the_args, " ", sizeof(the_args));
 391                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 392                         break;
 393                 }
 394                 mode_ptr++;
 395         }
 396         if (the_args[0])
 397                 strlcat(the_modes, the_args, sizeof(the_modes));
 398
 399         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 400                                 Client_ID(Origin), Channel_Name(Channel),
 401                                 the_modes))
 402                 return DISCONNECTED;
 403 #ifndef STRICT_RFC
 404         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 405                                   Client_ID(Origin), Channel_Name(Channel),
 406                                   Channel_CreationTime(Channel)))
 407                 return DISCONNECTED;
 408 #endif
 409         return CONNECTED;
 410 }
 411
 412 /**
 413  * Handle channel mode and channel-user mode changes
 414  *
 415  * @param Client The client from which this command has been received.
 416  * @param Req Request structure with prefix and all parameters.
 417  * @param Origin The originator of the MODE command (prefix).
 418  * @param Channel The target channel of this MODE command.
 419  * @return CONNECTED or DISCONNECTED.
 420  */
 421 static bool
 422 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 423 {
 424         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 425             argadd[CLIENT_PASS_LEN], *mode_ptr;
 426         bool connected, set, skiponce, retval, use_servermode,
 427              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 428         int mode_arg, arg_arg, mode_arg_count = 0;
 429         CLIENT *client;
 430         long l;
 431         size_t len;
 432
 433         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 434
 435         if (Channel_IsModeless(Channel))
 436                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 437                                 Client_ID(Client), Channel_Name(Channel));
 438
 439         /* Mode request: let's answer it :-) */
 440         if (Req->argc <= 1)
 441                 return Channel_Mode_Answer_Request(Origin, Channel);
 442
 443         /* Check if origin is oper and opers can use mode */
 444         use_servermode = Conf_OperServerMode;
 445         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 446                 is_oper = true;
 447         }
 448
 449         /* Check if client is a server/service */
 450         if(Client_Type(Client) == CLIENT_SERVER ||
 451            Client_Type(Client) == CLIENT_SERVICE) {
 452                 is_machine = true;
 453         }
 454
 455         /* Check if client is member of channel or an oper or an server/service */
 456         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 457                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 458                                           Client_ID(Origin),
 459                                           Channel_Name(Channel));
 460
 461         mode_arg = 1;
 462         mode_ptr = Req->argv[mode_arg];
 463         if (Req->argc > mode_arg + 1)
 464                 arg_arg = mode_arg + 1;
 465         else
 466                 arg_arg = -1;
 467
 468         /* Initial state: set or unset modes? */
 469         skiponce = false;
 470         switch (*mode_ptr) {
 471         case '-':
 472                 set = false;
 473                 break;
 474         case '+':
 475                 set = true;
 476                 break;
 477         default:
 478                 set = true;
 479                 skiponce = true;
 480         }
 481
 482         /* Prepare reply string */
 483         strcpy(the_modes, set ? "+" : "-");
 484         the_args[0] = '\0';
 485
 486         x[1] = '\0';
 487         connected = CONNECTED;
 488         while (mode_ptr) {
 489                 if (!skiponce)
 490                         mode_ptr++;
 491                 if (!*mode_ptr) {
 492                         /* Try next argument if there's any */
 493                         if (arg_arg < 0)
 494                                 break;
 495                         if (arg_arg > mode_arg)
 496                                 mode_arg = arg_arg;
 497                         else
 498                                 mode_arg++;
 499
 500                         if (mode_arg >= Req->argc)
 501                                 break;
 502                         mode_ptr = Req->argv[mode_arg];
 503
 504                         if (Req->argc > mode_arg + 1)
 505                                 arg_arg = mode_arg + 1;
 506                         else
 507                                 arg_arg = -1;
 508                 }
 509                 skiponce = false;
 510
 511                 switch (*mode_ptr) {
 512                 case '+':
 513                 case '-':
 514                         if (((*mode_ptr == '+') && !set)
 515                             || ((*mode_ptr == '-') && set)) {
 516                                 /* Action modifier ("+"/"-") must be changed ... */
 517                                 len = strlen(the_modes) - 1;
 518                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 519                                         /* Adjust last action modifier in result */
 520                                         the_modes[len] = *mode_ptr;
 521                                 } else {
 522                                         /* Append modifier character to result string */
 523                                         x[0] = *mode_ptr;
 524                                         strlcat(the_modes, x, sizeof(the_modes));
 525                                 }
 526                                 set = *mode_ptr == '+';
 527                         }
 528                         continue;
 529                 }
 530
 531                 /* Are there arguments left? */
 532                 if (arg_arg >= Req->argc)
 533                         arg_arg = -1;
 534
 535                 if(!is_machine && !is_oper) {
 536                         if (Channel_UserHasMode(Channel, Client, 'q'))
 537                                 is_owner = true;
 538                         if (Channel_UserHasMode(Channel, Client, 'a'))
 539                                 is_admin = true;
 540                         if (Channel_UserHasMode(Channel, Client, 'o'))
 541                                 is_op = true;
 542                         if (Channel_UserHasMode(Channel, Client, 'h'))
 543                                 is_halfop = true;
 544                 }
 545
 546                 /* Validate modes */
 547                 x[0] = '\0';
 548                 argadd[0] = '\0';
 549                 client = NULL;
 550                 switch (*mode_ptr) {
 551                 /* --- Channel modes --- */
 552                 case 'R': /* Registered users only */
 553                 case 's': /* Secret channel */
 554                 case 'z': /* Secure connections only */
 555                         if(!is_oper && !is_machine && !is_owner &&
 556                            !is_admin && !is_op) {
 557                                 connected = IRC_WriteErrClient(Origin,
 558                                         ERR_CHANOPRIVSNEEDED_MSG,
 559                                         Client_ID(Origin), Channel_Name(Channel));
 560                                 goto chan_exit;
 561                         }
 562                 case 'i': /* Invite only */
 563                 case 'V': /* Invite disallow */
 564                 case 'M': /* Only identified nicks can write */
 565                 case 'm': /* Moderated */
 566                 case 'n': /* Only members can write */
 567                 case 'Q': /* No kicks */
 568                 case 't': /* Topic locked */
 569                         if(is_oper || is_machine || is_owner ||
 570                            is_admin || is_op || is_halfop)
 571                                 x[0] = *mode_ptr;
 572                         else
 573                                 connected = IRC_WriteErrClient(Origin,
 574                                         ERR_CHANOPRIVSNEEDED_MSG,
 575                                         Client_ID(Origin), Channel_Name(Channel));
 576                         break;
 577                 case 'k': /* Channel key */
 578                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 579                                 goto chan_exit;
 580                         if (!set) {
 581                                 if (is_oper || is_machine || is_owner ||
 582                                     is_admin || is_op || is_halfop) {
 583                                         x[0] = *mode_ptr;
 584                                         if (Channel_HasMode(Channel, 'k'))
 585                                                 strlcpy(argadd, "*", sizeof(argadd));
 586                                         if (arg_arg > mode_arg)
 587                                                 arg_arg++;
 588                                 } else
 589                                         connected = IRC_WriteErrClient(Origin,
 590                                                 ERR_CHANOPRIVSNEEDED_MSG,
 591                                                 Client_ID(Origin),
 592                                                 Channel_Name(Channel));
 593                                 break;
 594                         }
 595                         if (arg_arg > mode_arg) {
 596                                 if (is_oper || is_machine || is_owner ||
 597                                     is_admin || is_op || is_halfop) {
 598                                         Channel_ModeDel(Channel, 'k');
 599                                         Channel_SetKey(Channel,
 600                                                        Req->argv[arg_arg]);
 601                                         strlcpy(argadd, Channel_Key(Channel),
 602                                                 sizeof(argadd));
 603                                         x[0] = *mode_ptr;
 604                                 } else {
 605                                         connected = IRC_WriteErrClient(Origin,
 606                                                 ERR_CHANOPRIVSNEEDED_MSG,
 607                                                 Client_ID(Origin),
 608                                                 Channel_Name(Channel));
 609                                 }
 610                                 Req->argv[arg_arg][0] = '\0';
 611                                 arg_arg++;
 612                         } else {
 613 #ifdef STRICT_RFC
 614                                 /* Only send error message in "strict" mode,
 615                                  * this is how ircd2.11 and others behave ... */
 616                                 connected = IRC_WriteErrClient(Origin,
 617                                         ERR_NEEDMOREPARAMS_MSG,
 618                                         Client_ID(Origin), Req->command);
 619 #endif
 620                                 goto chan_exit;
 621                         }
 622                         break;
 623                 case 'l': /* Member limit */
 624                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 625                                 goto chan_exit;
 626                         if (!set) {
 627                                 if (is_oper || is_machine || is_owner ||
 628                                     is_admin || is_op || is_halfop)
 629                                         x[0] = *mode_ptr;
 630                                 else
 631                                         connected = IRC_WriteErrClient(Origin,
 632                                                 ERR_CHANOPRIVSNEEDED_MSG,
 633                                                 Client_ID(Origin),
 634                                                 Channel_Name(Channel));
 635                                 break;
 636                         }
 637                         if (arg_arg > mode_arg) {
 638                                 if (is_oper || is_machine || is_owner ||
 639                                     is_admin || is_op || is_halfop) {
 640                                         l = atol(Req->argv[arg_arg]);
 641                                         if (l > 0 && l < 0xFFFF) {
 642                                                 Channel_ModeDel(Channel, 'l');
 643                                                 Channel_SetMaxUsers(Channel, l);
 644                                                 snprintf(argadd, sizeof(argadd),
 645                                                          "%ld", l);
 646                                                 x[0] = *mode_ptr;
 647                                         }
 648                                 } else {
 649                                         connected = IRC_WriteErrClient(Origin,
 650                                                 ERR_CHANOPRIVSNEEDED_MSG,
 651                                                 Client_ID(Origin),
 652                                                 Channel_Name(Channel));
 653                                 }
 654                                 Req->argv[arg_arg][0] = '\0';
 655                                 arg_arg++;
 656                         } else {
 657 #ifdef STRICT_RFC
 658                                 /* Only send error message in "strict" mode,
 659                                  * this is how ircd2.11 and others behave ... */
 660                                 connected = IRC_WriteErrClient(Origin,
 661                                         ERR_NEEDMOREPARAMS_MSG,
 662                                         Client_ID(Origin), Req->command);
 663 #endif
 664                                 goto chan_exit;
 665                         }
 666                         break;
 667                 case 'O': /* IRC operators only */
 668                         if (set) {
 669                                 /* Only IRC operators are allowed to
 670                                  * set the 'O' channel mode! */
 671                                 if(is_oper || is_machine)
 672                                         x[0] = 'O';
 673                                 else
 674                                         connected = IRC_WriteErrClient(Origin,
 675                                                 ERR_NOPRIVILEGES_MSG,
 676                                                 Client_ID(Origin));
 677                         } else if(is_oper || is_machine || is_owner ||
 678                                   is_admin || is_op)
 679                                 x[0] = 'O';
 680                         else
 681                                 connected = IRC_WriteErrClient(Origin,
 682                                         ERR_CHANOPRIVSNEEDED_MSG,
 683                                         Client_ID(Origin),
 684                                         Channel_Name(Channel));
 685                         break;
 686                 case 'P': /* Persistent channel */
 687                         if (set) {
 688                                 /* Only IRC operators are allowed to
 689                                  * set the 'P' channel mode! */
 690                                 if(is_oper || is_machine)
 691                                         x[0] = 'P';
 692                                 else
 693                                         connected = IRC_WriteErrClient(Origin,
 694                                                 ERR_NOPRIVILEGES_MSG,
 695                                                 Client_ID(Origin));
 696                         } else if(is_oper || is_machine || is_owner ||
 697                                   is_admin || is_op)
 698                                 x[0] = 'P';
 699                         else
 700                                 connected = IRC_WriteErrClient(Origin,
 701                                         ERR_CHANOPRIVSNEEDED_MSG,
 702                                         Client_ID(Origin),
 703                                         Channel_Name(Channel));
 704                         break;
 705                 /* --- Channel user modes --- */
 706                 case 'q': /* Owner */
 707                 case 'a': /* Channel admin */
 708                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 709                                 connected = IRC_WriteErrClient(Origin,
 710                                         ERR_CHANOPPRIVTOOLOW_MSG,
 711                                         Client_ID(Origin),
 712                                         Channel_Name(Channel));
 713                                 goto chan_exit;
 714                         }
 715                 case 'o': /* Channel operator */
 716                         if(!is_oper && !is_machine && !is_owner &&
 717                            !is_admin && !is_op) {
 718                                 connected = IRC_WriteErrClient(Origin,
 719                                         ERR_CHANOPRIVSNEEDED_MSG,
 720                                         Client_ID(Origin),
 721                                         Channel_Name(Channel));
 722                                 goto chan_exit;
 723                         }
 724                 case 'h': /* Half Op */
 725                         if(!is_oper && !is_machine && !is_owner &&
 726                            !is_admin && !is_op) {
 727                                 connected = IRC_WriteErrClient(Origin,
 728                                         ERR_CHANOPRIVSNEEDED_MSG,
 729                                         Client_ID(Origin),
 730                                         Channel_Name(Channel));
 731                                 goto chan_exit;
 732                         }
 733                 case 'v': /* Voice */
 734                         if (arg_arg > mode_arg) {
 735                                 if (is_oper || is_machine || is_owner ||
 736                                     is_admin || is_op || is_halfop) {
 737                                         client = Client_Search(Req->argv[arg_arg]);
 738                                         if (client)
 739                                                 x[0] = *mode_ptr;
 740                                         else
 741                                                 connected = IRC_WriteErrClient(Origin,
 742                                                         ERR_NOSUCHNICK_MSG,
 743                                                         Client_ID(Origin),
 744                                                         Req->argv[arg_arg]);
 745                                 } else {
 746                                         connected = IRC_WriteErrClient(Origin,
 747                                                 ERR_CHANOPRIVSNEEDED_MSG,
 748                                                 Client_ID(Origin),
 749                                                 Channel_Name(Channel));
 750                                 }
 751                                 Req->argv[arg_arg][0] = '\0';
 752                                 arg_arg++;
 753                         } else {
 754 #ifdef STRICT_RFC
 755                                 /* Report an error to the client, when a user
 756                                  * mode should be changed but no nickname is
 757                                  * given. But don't do it when not in "strict"
 758                                  * mode, because most other servers don't do
 759                                  * it as well and some clients send "wired"
 760                                  * MODE commands like "MODE #chan -ooo nick". */
 761                                 connected = IRC_WriteErrClient(Origin,
 762                                         ERR_NEEDMOREPARAMS_MSG,
 763                                         Client_ID(Origin), Req->command);
 764 #endif
 765                                 goto chan_exit;
 766                         }
 767                         break;
 768                 /* --- Channel lists --- */
 769                 case 'I': /* Invite lists */
 770                 case 'b': /* Ban lists */
 771                 case 'e': /* Channel exception lists */
 772                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 773                                 goto chan_exit;
 774                         if (arg_arg > mode_arg) {
 775                                 /* modify list */
 776                                 if (is_oper || is_machine || is_owner ||
 777                                     is_admin || is_op || is_halfop) {
 778                                         connected = set
 779                                            ? Add_To_List(*mode_ptr, Origin,
 780                                                 Client, Channel,
 781                                                 Req->argv[arg_arg])
 782                                            : Del_From_List(*mode_ptr, Origin,
 783                                                 Client, Channel,
 784                                                 Req->argv[arg_arg]);
 785                                 } else {
 786                                         connected = IRC_WriteErrClient(Origin,
 787                                                 ERR_CHANOPRIVSNEEDED_MSG,
 788                                                 Client_ID(Origin),
 789                                                 Channel_Name(Channel));
 790                                 }
 791                                 Req->argv[arg_arg][0] = '\0';
 792                                 arg_arg++;
 793                         } else {
 794                                 switch (*mode_ptr) {
 795                                 case 'I':
 796                                         Channel_ShowInvites(Origin, Channel);
 797                                         break;
 798                                 case 'b':
 799                                         Channel_ShowBans(Origin, Channel);
 800                                         break;
 801                                 case 'e':
 802                                         Channel_ShowExcepts(Origin, Channel);
 803                                         break;
 804                                 }
 805                         }
 806                         break;
 807                 default:
 808                         if (Client_Type(Client) != CLIENT_SERVER) {
 809                                 Log(LOG_DEBUG,
 810                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 811                                     set ? '+' : '-', *mode_ptr,
 812                                     Client_ID(Origin), Channel_Name(Channel));
 813                                 connected = IRC_WriteErrClient(Origin,
 814                                         ERR_UNKNOWNMODE_MSG,
 815                                         Client_ID(Origin), *mode_ptr,
 816                                         Channel_Name(Channel));
 817                                 x[0] = '\0';
 818                         } else {
 819                                 Log(LOG_DEBUG,
 820                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 821                                     set ? '+' : '-', *mode_ptr,
 822                                     Client_ID(Origin), Channel_Name(Channel));
 823                                 x[0] = *mode_ptr;
 824                         }
 825                 }
 826
 827                 if (!connected)
 828                         break;
 829
 830                 /* Is there a valid mode change? */
 831                 if (!x[0])
 832                         continue;
 833
 834                 /* Validate target client */
 835                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 836                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 837                                                 Client_ID(Origin),
 838                                                 Client_ID(client),
 839                                                 Channel_Name(Channel)))
 840                                 break;
 841                         continue;
 842                 }
 843
 844                 if (client) {
 845                         /* Channel-User-Mode */
 846                         retval = set
 847                                ? Channel_UserModeAdd(Channel, client, x[0])
 848                                : Channel_UserModeDel(Channel, client, x[0]);
 849                         if (retval) {
 850                                 strlcat(the_args, " ", sizeof(the_args));
 851                                 strlcat(the_args, Client_ID(client),
 852                                         sizeof(the_args));
 853                                 strlcat(the_modes, x, sizeof(the_modes));
 854                                 LogDebug
 855                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 856                                      Client_Mask(client), Channel_Name(Channel),
 857                                      Channel_UserModes(Channel, client));
 858                         }
 859                 } else {
 860                         /* Channel-Mode */
 861                         retval = set
 862                                ? Channel_ModeAdd(Channel, x[0])
 863                                : Channel_ModeDel(Channel, x[0]);
 864                         if (retval) {
 865                                 strlcat(the_modes, x, sizeof(the_modes));
 866                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 867                                          Channel_Name(Channel),
 868                                          Channel_Modes(Channel));
 869                         }
 870                 }
 871
 872                 /* Are there additional arguments to add? */
 873                 if (argadd[0]) {
 874                         strlcat(the_args, " ", sizeof(the_args));
 875                         strlcat(the_args, argadd, sizeof(the_args));
 876                 }
 877         }
 878
 879       chan_exit:
 880         /* Are there changed modes? */
 881         if (the_modes[1]) {
 882                 /* Clean up mode string */
 883                 len = strlen(the_modes) - 1;
 884                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 885                         the_modes[len] = '\0';
 886
 887                 if (Client_Type(Client) == CLIENT_SERVER) {
 888                         /* MODE requests for local channels from other servers
 889                          * are definitely invalid! */
 890                         if (Channel_IsLocal(Channel)) {
 891                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 892                                 return CONNECTED;
 893                         }
 894
 895                         /* Forward mode changes to channel users and all the
 896                          * other remote servers: */
 897                         IRC_WriteStrServersPrefix(Client, Origin,
 898                                 "MODE %s %s%s", Channel_Name(Channel),
 899                                 the_modes, the_args);
 900                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 901                                 false, "MODE %s %s%s", Channel_Name(Channel),
 902                                 the_modes, the_args);
 903                 } else {
 904                         if (use_servermode)
 905                                 Origin = Client_ThisServer();
 906                         /* Send reply to client and inform other servers and channel users */
 907                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 908                                         "MODE %s %s%s", Channel_Name(Channel),
 909                                         the_modes, the_args);
 910                         /* Only forward requests for non-local channels */
 911                         if (!Channel_IsLocal(Channel))
 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                 }
 919         }
 920
 921         return connected;
 922 } /* Channel_Mode */
 923
 924 /**
 925  * Handler for the IRC "AWAY" command.
 926  *
 927  * @param Client The client from which this command has been received.
 928  * @param Req Request structure with prefix and all parameters.
 929  * @return CONNECTED or DISCONNECTED.
 930  */
 931 GLOBAL bool
 932 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 933 {
 934         assert (Client != NULL);
 935         assert (Req != NULL);
 936
 937         if (Req->argc == 1 && Req->argv[0][0]) {
 938                 Client_SetAway(Client, Req->argv[0]);
 939                 Client_ModeAdd(Client, 'a');
 940                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 941                                           Client_ID( Client));
 942                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 943                                           Client_ID( Client));
 944         } else {
 945                 Client_ModeDel(Client, 'a');
 946                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 947                                           Client_ID( Client));
 948                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 949                                           Client_ID( Client));
 950         }
 951 } /* IRC_AWAY */
 952
 953 /**
 954  * Add entries to channel invite, ban and exception lists.
 955  *
 956  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 957  * @param Prefix The originator of the command.
 958  * @param Client The sender of the command.
 959  * @param Channel The channel of which the list should be modified.
 960  * @param Pattern The pattern to add to the list.
 961  * @return CONNECTED or DISCONNECTED.
 962  */
 963 static bool
 964 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 965             const char *Pattern)
 966 {
 967         char mask[MASK_LEN];
 968         struct list_head *list = NULL;
 969         long int current_count;
 970
 971         assert(Client != NULL);
 972         assert(Channel != NULL);
 973         assert(Pattern != NULL);
 974         assert(what == 'I' || what == 'b' || what == 'e');
 975
 976         Lists_MakeMask(Pattern, mask, sizeof(mask));
 977         current_count = Lists_Count(Channel_GetListInvites(Channel))
 978                         + Lists_Count(Channel_GetListExcepts(Channel))
 979                         + Lists_Count(Channel_GetListBans(Channel));
 980
 981         switch(what) {
 982                 case 'I':
 983                         list = Channel_GetListInvites(Channel);
 984                         break;
 985                 case 'b':
 986                         list = Channel_GetListBans(Channel);
 987                         break;
 988                 case 'e':
 989                         list = Channel_GetListExcepts(Channel);
 990                         break;
 991         }
 992
 993         if (Lists_CheckDupeMask(list, mask))
 994                 return CONNECTED;
 995         if (Client_Type(Client) == CLIENT_USER &&
 996             current_count >= MAX_HNDL_CHANNEL_LISTS)
 997                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
 998                                           Client_ID(Client),
 999                                           Channel_Name(Channel), mask,
1000                                           MAX_HNDL_CHANNEL_LISTS);
1001
1002         switch (what) {
1003                 case 'I':
1004                         if (!Channel_AddInvite(Channel, mask, false))
1005                                 return CONNECTED;
1006                         break;
1007                 case 'b':
1008                         if (!Channel_AddBan(Channel, mask))
1009                                 return CONNECTED;
1010                         break;
1011                 case 'e':
1012                         if (!Channel_AddExcept(Channel, mask))
1013                                 return CONNECTED;
1014                         break;
1015         }
1016         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1017 }
1018
1019 /**
1020  * Delete entries from channel invite, ban and exception lists.
1021  *
1022  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1023  * @param Prefix The originator of the command.
1024  * @param Client The sender of the command.
1025  * @param Channel The channel of which the list should be modified.
1026  * @param Pattern The pattern to add to the list.
1027  * @return CONNECTED or DISCONNECTED.
1028  */
1029 static bool
1030 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1031               const char *Pattern)
1032 {
1033         char mask[MASK_LEN];
1034         struct list_head *list = NULL;
1035
1036         assert(Client != NULL);
1037         assert(Channel != NULL);
1038         assert(Pattern != NULL);
1039         assert(what == 'I' || what == 'b' || what == 'e');
1040
1041         Lists_MakeMask(Pattern, mask, sizeof(mask));
1042
1043         switch (what) {
1044                 case 'I':
1045                         list = Channel_GetListInvites(Channel);
1046                         break;
1047                 case 'b':
1048                         list = Channel_GetListBans(Channel);
1049                         break;
1050                 case 'e':
1051                         list = Channel_GetListExcepts(Channel);
1052                         break;
1053         }
1054
1055         if (!Lists_CheckDupeMask(list, mask))
1056                 return CONNECTED;
1057         Lists_Del(list, mask);
1058
1059         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1060 }
1061
1062 /**
1063  * Send information about changed channel invite/ban/exception lists to clients.
1064  *
1065  * @param IsAdd true if the list item has been added, false otherwise.
1066  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1067  * @param Prefix The originator of the mode list change.
1068  * @param Client The sender of the command.
1069  * @param Channel The channel of which the list has been modified.
1070  * @param Mask The mask which has been added or removed.
1071  * @return CONNECTED or DISCONNECTED.
1072  */
1073 static bool
1074 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1075                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1076 {
1077         bool ok = true;
1078
1079         /* Send confirmation to the client */
1080         if (Client_Type(Client) == CLIENT_USER)
1081                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1082                                               Channel_Name(Channel),
1083                                               IsAdd ? '+' : '-',
1084                                               ModeChar, Mask);
1085
1086         /* to other servers */
1087         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1088                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1089                                   ModeChar, Mask);
1090
1091         /* and local users in channel */
1092         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1093                                   "MODE %s %c%c %s", Channel_Name(Channel),
1094                                   IsAdd ? '+' : '-', ModeChar, Mask );
1095
1096         return ok;
1097 } /* Send_ListChange */
1098
1099 /* -eof- */