src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-macros.h"
  29 #include "irc-write.h"
  30 #include "lists.h"
  31 #include "log.h"
  32 #include "parse.h"
  33 #include "messages.h"
  34 #include "conf.h"
  35
  36 #include "exp.h"
  37 #include "irc-mode.h"
  38
  39 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  40                                 CLIENT *Target));
  41 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42                                  CHANNEL *Channel));
  43
  44 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  45                                 CHANNEL *Channel, const char *Pattern));
  46 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  47                                   CHANNEL *Channel, const char *Pattern));
  48
  49 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  50                                     CLIENT *Prefix, CLIENT *Client,
  51                                     CHANNEL *Channel, const char *Mask));
  52
  53 /**
  54  * Handler for the IRC "MODE" command.
  55  *
  56  * This function detects whether user or channel modes should be modified
  57  * and calls the appropriate sub-functions.
  58  *
  59  * @param Client The client from which this command has been received.
  60  * @param Req Request structure with prefix and all parameters.
  61  * @return CONNECTED or DISCONNECTED.
  62  */
  63 GLOBAL bool
  64 IRC_MODE( CLIENT *Client, REQUEST *Req )
  65 {
  66         CLIENT *cl, *origin;
  67         CHANNEL *chan;
  68
  69         assert(Client != NULL);
  70         assert(Req != NULL);
  71
  72         _IRC_GET_SENDER_OR_RETURN_(origin, Req, Client)
  73
  74         /* Channel or user mode? */
  75         cl = NULL; chan = NULL;
  76         if (Client_IsValidNick(Req->argv[0]))
  77                 cl = Client_Search(Req->argv[0]);
  78         if (Channel_IsValidName(Req->argv[0]))
  79                 chan = Channel_Search(Req->argv[0]);
  80
  81         if (cl)
  82                 return Client_Mode(Client, Req, origin, cl);
  83         if (chan)
  84                 return Channel_Mode(Client, Req, origin, chan);
  85
  86         /* No target found! */
  87         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
  88                         Client_ID(Client), Req->argv[0]);
  89 } /* IRC_MODE */
  90
  91 /**
  92  * Check if the "mode limit" for a client has been reached.
  93  *
  94  * This limit doesn't apply for servers or services!
  95  *
  96  * @param Client The client to check.
  97  * @param Count The number of modes already handled.
  98  * @return true if the limit has been reached.
  99  */
 100 static bool
 101 Mode_Limit_Reached(CLIENT *Client, int Count)
 102 {
 103         if (Client_Type(Client) == CLIENT_SERVER
 104             || Client_Type(Client) == CLIENT_SERVICE)
 105                 return false;
 106         if (Count < MAX_HNDL_MODES_ARG)
 107                 return false;
 108         return true;
 109 }
 110
 111 /**
 112  * Handle client mode requests
 113  *
 114  * @param Client The client from which this command has been received.
 115  * @param Req Request structure with prefix and all parameters.
 116  * @param Origin The originator of the MODE command (prefix).
 117  * @param Target The target (client) of this MODE command.
 118  * @return CONNECTED or DISCONNECTED.
 119  */
 120 static bool
 121 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 122 {
 123         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 124         bool ok, set;
 125         bool send_RPL_HOSTHIDDEN_MSG = false;
 126         int mode_arg;
 127         size_t len;
 128
 129         /* Is the client allowed to request or change the modes? */
 130         if (Client_Type(Client) == CLIENT_USER) {
 131                 /* Users are only allowed to manipulate their own modes! */
 132                 if (Target != Client)
 133                         return IRC_WriteErrClient(Client,
 134                                                   ERR_USERSDONTMATCH_MSG,
 135                                                   Client_ID(Client));
 136         }
 137
 138         /* Mode request: let's answer it :-) */
 139         if (Req->argc == 1)
 140                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 141                                           Client_ID(Target),
 142                                           Client_Modes(Target));
 143
 144         mode_arg = 1;
 145         mode_ptr = Req->argv[mode_arg];
 146
 147         /* Initial state: set or unset modes? */
 148         if (*mode_ptr == '+') {
 149                 set = true;
 150                 strcpy(the_modes, "+");
 151         } else if (*mode_ptr == '-') {
 152                 set = false;
 153                 strcpy(the_modes, "-");
 154         } else
 155                 return IRC_WriteErrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 156                                           Client_ID(Origin));
 157
 158         x[1] = '\0';
 159         ok = CONNECTED;
 160         while (mode_ptr) {
 161                 mode_ptr++;
 162                 if (!*mode_ptr) {
 163                         /* Try next argument if there's any */
 164                         mode_arg++;
 165                         if (mode_arg < Req->argc)
 166                                 mode_ptr = Req->argv[mode_arg];
 167                         else
 168                                 break;
 169                 }
 170
 171                 switch(*mode_ptr) {
 172                   case '+':
 173                   case '-':
 174                         if ((*mode_ptr == '+' && !set)
 175                             || (*mode_ptr == '-' && set)) {
 176                                 /* Action modifier ("+"/"-") must be changed */
 177                                 len = strlen(the_modes) - 1;
 178                                 if (the_modes[len] == '+'
 179                                     || the_modes[len] == '-') {
 180                                         /* Last character in the "result
 181                                          * string" was an "action", so just
 182                                          * overwrite it with the new action */
 183                                         the_modes[len] = *mode_ptr;
 184                                 } else {
 185                                         /* Append new modifier character to
 186                                          * the resulting mode string */
 187                                         x[0] = *mode_ptr;
 188                                         strlcat(the_modes, x,
 189                                                 sizeof(the_modes));
 190                                 }
 191                                 if (*mode_ptr == '+')
 192                                         set = true;
 193                                 else
 194                                         set = false;
 195                         }
 196                         continue;
 197                 }
 198
 199                 /* Validate modes */
 200                 x[0] = '\0';
 201                 switch (*mode_ptr) {
 202                 case 'b': /* Block private msgs */
 203                 case 'C': /* Only messages from clients sharing a channel */
 204                 case 'i': /* Invisible */
 205                 case 's': /* Server messages */
 206                 case 'w': /* Wallops messages */
 207                         x[0] = *mode_ptr;
 208                         break;
 209                 case 'a': /* Away */
 210                         if (Client_Type(Client) == CLIENT_SERVER) {
 211                                 x[0] = 'a';
 212                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 213                         } else
 214                                 ok = IRC_WriteErrClient(Origin,
 215                                                         ERR_NOPRIVILEGES_MSG,
 216                                                         Client_ID(Origin));
 217                         break;
 218                 case 'B': /* Bot */
 219                         if (Client_HasMode(Client, 'r'))
 220                                 ok = IRC_WriteErrClient(Origin,
 221                                                         ERR_RESTRICTED_MSG,
 222                                                         Client_ID(Origin));
 223                         else
 224                                 x[0] = 'B';
 225                         break;
 226                 case 'c': /* Receive connect notices */
 227                 case 'q': /* KICK-protected user */
 228                           /* (only settable by IRC operators!) */
 229                         if (!set || Client_Type(Client) == CLIENT_SERVER
 230                             || Client_HasMode(Origin, 'o'))
 231                                 x[0] = *mode_ptr;
 232                         else
 233                                 ok = IRC_WriteErrClient(Origin,
 234                                                         ERR_NOPRIVILEGES_MSG,
 235                                                         Client_ID(Origin));
 236                         break;
 237                 case 'o': /* IRC operator (only unsettable!) */
 238                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 239                                 x[0] = 'o';
 240                         } else
 241                                 ok = IRC_WriteErrClient(Origin,
 242                                                         ERR_NOPRIVILEGES_MSG,
 243                                                         Client_ID(Origin));
 244                         break;
 245                 case 'r': /* Restricted (only settable) */
 246                         if (set || Client_Type(Client) == CLIENT_SERVER)
 247                                 x[0] = 'r';
 248                         else
 249                                 ok = IRC_WriteErrClient(Origin,
 250                                                         ERR_RESTRICTED_MSG,
 251                                                         Client_ID(Origin));
 252                         break;
 253                 case 'R': /* Registered (not [un]settable by clients) */
 254                         if (Client_Type(Client) == CLIENT_SERVER)
 255                                 x[0] = 'R';
 256                         else
 257                                 ok = IRC_WriteErrClient(Origin,
 258                                                         ERR_NICKREGISTER_MSG,
 259                                                         Client_ID(Origin));
 260                         break;
 261                 case 'x': /* Cloak hostname */
 262                         if (Client_HasMode(Client, 'r'))
 263                                 ok = IRC_WriteErrClient(Origin,
 264                                                         ERR_RESTRICTED_MSG,
 265                                                         Client_ID(Origin));
 266                         else if (!set || Conf_CloakHostModeX[0]
 267                                  || Client_Type(Client) == CLIENT_SERVER
 268                                  || Client_HasMode(Origin, 'o')) {
 269                                 x[0] = 'x';
 270                                 send_RPL_HOSTHIDDEN_MSG = true;
 271                         } else
 272                                 ok = IRC_WriteErrClient(Origin,
 273                                                         ERR_NOPRIVILEGES_MSG,
 274                                                         Client_ID(Origin));
 275                         break;
 276                 default:
 277                         if (Client_Type(Client) != CLIENT_SERVER) {
 278                                 Log(LOG_DEBUG,
 279                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 280                                     set ? '+' : '-', *mode_ptr,
 281                                     Client_ID(Origin));
 282                                 ok = IRC_WriteErrClient(Origin,
 283                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 284                                                         Client_ID(Origin),
 285                                                         set ? '+' : '-',
 286                                                         *mode_ptr);
 287                                 x[0] = '\0';
 288                         } else {
 289                                 Log(LOG_DEBUG,
 290                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 291                                     set ? '+' : '-', *mode_ptr,
 292                                     Client_ID(Origin), Client_ID(Target));
 293                                 x[0] = *mode_ptr;
 294                         }
 295                 }
 296
 297                 if (!ok)
 298                         break;
 299
 300                 /* Is there a valid mode change? */
 301                 if (!x[0])
 302                         continue;
 303
 304                 if (set) {
 305                         if (Client_ModeAdd(Target, x[0]))
 306                                 strlcat(the_modes, x, sizeof(the_modes));
 307                 } else {
 308                         if (Client_ModeDel(Target, x[0]))
 309                                 strlcat(the_modes, x, sizeof(the_modes));
 310                 }
 311         }
 312
 313         /* Are there changed modes? */
 314         if (the_modes[1]) {
 315                 /* Remove needless action modifier characters */
 316                 len = strlen(the_modes) - 1;
 317                 if (the_modes[len] == '+' || the_modes[len] == '-')
 318                         the_modes[len] = '\0';
 319
 320                 if (Client_Type(Client) == CLIENT_SERVER) {
 321                         /* Forward modes to other servers */
 322                         if (Client_Conn(Target) != NONE) {
 323                                 /* Remote server (service?) changed modes
 324                                  * for one of our clients. Inform it! */
 325                                 IRC_WriteStrClientPrefix(Target, Origin,
 326                                                          "MODE %s :%s",
 327                                                          Client_ID(Target),
 328                                                          the_modes);
 329                         }
 330                         IRC_WriteStrServersPrefix(Client, Origin,
 331                                                   "MODE %s :%s",
 332                                                   Client_ID(Target),
 333                                                   the_modes);
 334                 } else {
 335                         /* Send reply to client and inform other servers */
 336                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 337                                                       "MODE %s :%s",
 338                                                       Client_ID(Target),
 339                                                       the_modes);
 340                         IRC_WriteStrServersPrefix(Client, Origin,
 341                                                   "MODE %s :%s",
 342                                                   Client_ID(Target),
 343                                                   the_modes);
 344                 }
 345
 346                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 347                         /* A new (cloaked) hostname must be announced */
 348                         IRC_WriteStrClientPrefix(Target, Origin,
 349                                                  RPL_HOSTHIDDEN_MSG,
 350                                                  Client_ID(Target),
 351                                                  Client_HostnameDisplayed(Target));
 352
 353                 }
 354
 355                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 356                          Client_TypeText(Target), Client_Mask(Target),
 357                          Client_Modes(Target));
 358         }
 359
 360         return ok;
 361 } /* Client_Mode */
 362
 363 /*
 364  * Reply to a channel mode request.
 365  *
 366  * @param Origin The originator of the MODE command (prefix).
 367  * @param Channel The channel of which the modes should be sent.
 368  * @return CONNECTED or DISCONNECTED.
 369  */
 370 static bool
 371 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 372 {
 373         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 374         const char *mode_ptr;
 375
 376         /* Member or not? -- That's the question! */
 377         if (!Channel_IsMemberOf(Channel, Origin))
 378                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 379                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 380
 381         /* The sender is a member: generate extended reply */
 382         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 383         mode_ptr = the_modes;
 384         the_args[0] = '\0';
 385
 386         while(*mode_ptr) {
 387                 switch(*mode_ptr) {
 388                 case 'l':
 389                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 390                         strlcat(the_args, argadd, sizeof(the_args));
 391                         break;
 392                 case 'k':
 393                         strlcat(the_args, " ", sizeof(the_args));
 394                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 395                         break;
 396                 }
 397                 mode_ptr++;
 398         }
 399         if (the_args[0])
 400                 strlcat(the_modes, the_args, sizeof(the_modes));
 401
 402         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 403                                 Client_ID(Origin), Channel_Name(Channel),
 404                                 the_modes))
 405                 return DISCONNECTED;
 406 #ifndef STRICT_RFC
 407         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 408                                   Client_ID(Origin), Channel_Name(Channel),
 409                                   Channel_CreationTime(Channel)))
 410                 return DISCONNECTED;
 411 #endif
 412         return CONNECTED;
 413 }
 414
 415 /**
 416  * Handle channel mode and channel-user mode changes
 417  *
 418  * @param Client The client from which this command has been received.
 419  * @param Req Request structure with prefix and all parameters.
 420  * @param Origin The originator of the MODE command (prefix).
 421  * @param Channel The target channel of this MODE command.
 422  * @return CONNECTED or DISCONNECTED.
 423  */
 424 static bool
 425 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 426 {
 427         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 428             argadd[CLIENT_PASS_LEN], *mode_ptr;
 429         bool connected, set, skiponce, retval, use_servermode,
 430              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 431         int mode_arg, arg_arg, mode_arg_count = 0;
 432         CLIENT *client;
 433         long l;
 434         size_t len;
 435
 436         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 437
 438         if (Channel_IsModeless(Channel))
 439                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 440                                 Client_ID(Client), Channel_Name(Channel));
 441
 442         /* Mode request: let's answer it :-) */
 443         if (Req->argc <= 1)
 444                 return Channel_Mode_Answer_Request(Origin, Channel);
 445
 446         /* Check if origin is oper and opers can use mode */
 447         use_servermode = Conf_OperServerMode;
 448         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 449                 is_oper = true;
 450         }
 451
 452         /* Check if client is a server/service */
 453         if(Client_Type(Client) == CLIENT_SERVER ||
 454            Client_Type(Client) == CLIENT_SERVICE) {
 455                 is_machine = true;
 456         }
 457
 458         /* Check if client is member of channel or an oper or an server/service */
 459         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 460                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 461                                           Client_ID(Origin),
 462                                           Channel_Name(Channel));
 463
 464         mode_arg = 1;
 465         mode_ptr = Req->argv[mode_arg];
 466         if (Req->argc > mode_arg + 1)
 467                 arg_arg = mode_arg + 1;
 468         else
 469                 arg_arg = -1;
 470
 471         /* Initial state: set or unset modes? */
 472         skiponce = false;
 473         switch (*mode_ptr) {
 474         case '-':
 475                 set = false;
 476                 break;
 477         case '+':
 478                 set = true;
 479                 break;
 480         default:
 481                 set = true;
 482                 skiponce = true;
 483         }
 484
 485         /* Prepare reply string */
 486         strcpy(the_modes, set ? "+" : "-");
 487         the_args[0] = '\0';
 488
 489         x[1] = '\0';
 490         connected = CONNECTED;
 491         while (mode_ptr) {
 492                 if (!skiponce)
 493                         mode_ptr++;
 494                 if (!*mode_ptr) {
 495                         /* Try next argument if there's any */
 496                         if (arg_arg < 0)
 497                                 break;
 498                         if (arg_arg > mode_arg)
 499                                 mode_arg = arg_arg;
 500                         else
 501                                 mode_arg++;
 502
 503                         if (mode_arg >= Req->argc)
 504                                 break;
 505                         mode_ptr = Req->argv[mode_arg];
 506
 507                         if (Req->argc > mode_arg + 1)
 508                                 arg_arg = mode_arg + 1;
 509                         else
 510                                 arg_arg = -1;
 511                 }
 512                 skiponce = false;
 513
 514                 switch (*mode_ptr) {
 515                 case '+':
 516                 case '-':
 517                         if (((*mode_ptr == '+') && !set)
 518                             || ((*mode_ptr == '-') && set)) {
 519                                 /* Action modifier ("+"/"-") must be changed ... */
 520                                 len = strlen(the_modes) - 1;
 521                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 522                                         /* Adjust last action modifier in result */
 523                                         the_modes[len] = *mode_ptr;
 524                                 } else {
 525                                         /* Append modifier character to result string */
 526                                         x[0] = *mode_ptr;
 527                                         strlcat(the_modes, x, sizeof(the_modes));
 528                                 }
 529                                 set = *mode_ptr == '+';
 530                         }
 531                         continue;
 532                 }
 533
 534                 /* Are there arguments left? */
 535                 if (arg_arg >= Req->argc)
 536                         arg_arg = -1;
 537
 538                 if(!is_machine && !is_oper) {
 539                         if (Channel_UserHasMode(Channel, Client, 'q'))
 540                                 is_owner = true;
 541                         if (Channel_UserHasMode(Channel, Client, 'a'))
 542                                 is_admin = true;
 543                         if (Channel_UserHasMode(Channel, Client, 'o'))
 544                                 is_op = true;
 545                         if (Channel_UserHasMode(Channel, Client, 'h'))
 546                                 is_halfop = true;
 547                 }
 548
 549                 /* Validate modes */
 550                 x[0] = '\0';
 551                 argadd[0] = '\0';
 552                 client = NULL;
 553                 switch (*mode_ptr) {
 554                 /* --- Channel modes --- */
 555                 case 'R': /* Registered users only */
 556                 case 's': /* Secret channel */
 557                 case 'z': /* Secure connections only */
 558                         if(!is_oper && !is_machine && !is_owner &&
 559                            !is_admin && !is_op) {
 560                                 connected = IRC_WriteErrClient(Origin,
 561                                         ERR_CHANOPRIVSNEEDED_MSG,
 562                                         Client_ID(Origin), Channel_Name(Channel));
 563                                 goto chan_exit;
 564                         }
 565                 case 'i': /* Invite only */
 566                 case 'V': /* Invite disallow */
 567                 case 'M': /* Only identified nicks can write */
 568                 case 'm': /* Moderated */
 569                 case 'n': /* Only members can write */
 570                 case 'Q': /* No kicks */
 571                 case 't': /* Topic locked */
 572                         if(is_oper || is_machine || is_owner ||
 573                            is_admin || is_op || is_halfop)
 574                                 x[0] = *mode_ptr;
 575                         else
 576                                 connected = IRC_WriteErrClient(Origin,
 577                                         ERR_CHANOPRIVSNEEDED_MSG,
 578                                         Client_ID(Origin), Channel_Name(Channel));
 579                         break;
 580                 case 'k': /* Channel key */
 581                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 582                                 goto chan_exit;
 583                         if (!set) {
 584                                 if (is_oper || is_machine || is_owner ||
 585                                     is_admin || is_op || is_halfop) {
 586                                         x[0] = *mode_ptr;
 587                                         if (Channel_HasMode(Channel, 'k'))
 588                                                 strlcpy(argadd, "*", sizeof(argadd));
 589                                         if (arg_arg > mode_arg)
 590                                                 arg_arg++;
 591                                 } else
 592                                         connected = IRC_WriteErrClient(Origin,
 593                                                 ERR_CHANOPRIVSNEEDED_MSG,
 594                                                 Client_ID(Origin),
 595                                                 Channel_Name(Channel));
 596                                 break;
 597                         }
 598                         if (arg_arg > mode_arg) {
 599                                 if (is_oper || is_machine || is_owner ||
 600                                     is_admin || is_op || is_halfop) {
 601                                         Channel_ModeDel(Channel, 'k');
 602                                         Channel_SetKey(Channel,
 603                                                        Req->argv[arg_arg]);
 604                                         strlcpy(argadd, Channel_Key(Channel),
 605                                                 sizeof(argadd));
 606                                         x[0] = *mode_ptr;
 607                                 } else {
 608                                         connected = IRC_WriteErrClient(Origin,
 609                                                 ERR_CHANOPRIVSNEEDED_MSG,
 610                                                 Client_ID(Origin),
 611                                                 Channel_Name(Channel));
 612                                 }
 613                                 Req->argv[arg_arg][0] = '\0';
 614                                 arg_arg++;
 615                         } else {
 616 #ifdef STRICT_RFC
 617                                 /* Only send error message in "strict" mode,
 618                                  * this is how ircd2.11 and others behave ... */
 619                                 connected = IRC_WriteErrClient(Origin,
 620                                         ERR_NEEDMOREPARAMS_MSG,
 621                                         Client_ID(Origin), Req->command);
 622 #endif
 623                                 goto chan_exit;
 624                         }
 625                         break;
 626                 case 'l': /* Member limit */
 627                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 628                                 goto chan_exit;
 629                         if (!set) {
 630                                 if (is_oper || is_machine || is_owner ||
 631                                     is_admin || is_op || is_halfop)
 632                                         x[0] = *mode_ptr;
 633                                 else
 634                                         connected = IRC_WriteErrClient(Origin,
 635                                                 ERR_CHANOPRIVSNEEDED_MSG,
 636                                                 Client_ID(Origin),
 637                                                 Channel_Name(Channel));
 638                                 break;
 639                         }
 640                         if (arg_arg > mode_arg) {
 641                                 if (is_oper || is_machine || is_owner ||
 642                                     is_admin || is_op || is_halfop) {
 643                                         l = atol(Req->argv[arg_arg]);
 644                                         if (l > 0 && l < 0xFFFF) {
 645                                                 Channel_ModeDel(Channel, 'l');
 646                                                 Channel_SetMaxUsers(Channel, l);
 647                                                 snprintf(argadd, sizeof(argadd),
 648                                                          "%ld", l);
 649                                                 x[0] = *mode_ptr;
 650                                         }
 651                                 } else {
 652                                         connected = IRC_WriteErrClient(Origin,
 653                                                 ERR_CHANOPRIVSNEEDED_MSG,
 654                                                 Client_ID(Origin),
 655                                                 Channel_Name(Channel));
 656                                 }
 657                                 Req->argv[arg_arg][0] = '\0';
 658                                 arg_arg++;
 659                         } else {
 660 #ifdef STRICT_RFC
 661                                 /* Only send error message in "strict" mode,
 662                                  * this is how ircd2.11 and others behave ... */
 663                                 connected = IRC_WriteErrClient(Origin,
 664                                         ERR_NEEDMOREPARAMS_MSG,
 665                                         Client_ID(Origin), Req->command);
 666 #endif
 667                                 goto chan_exit;
 668                         }
 669                         break;
 670                 case 'O': /* IRC operators only */
 671                         if (set) {
 672                                 /* Only IRC operators are allowed to
 673                                  * set the 'O' channel mode! */
 674                                 if(is_oper || is_machine)
 675                                         x[0] = 'O';
 676                                 else
 677                                         connected = IRC_WriteErrClient(Origin,
 678                                                 ERR_NOPRIVILEGES_MSG,
 679                                                 Client_ID(Origin));
 680                         } else if(is_oper || is_machine || is_owner ||
 681                                   is_admin || is_op)
 682                                 x[0] = 'O';
 683                         else
 684                                 connected = IRC_WriteErrClient(Origin,
 685                                         ERR_CHANOPRIVSNEEDED_MSG,
 686                                         Client_ID(Origin),
 687                                         Channel_Name(Channel));
 688                         break;
 689                 case 'P': /* Persistent channel */
 690                         if (set) {
 691                                 /* Only IRC operators are allowed to
 692                                  * set the 'P' channel mode! */
 693                                 if(is_oper || is_machine)
 694                                         x[0] = 'P';
 695                                 else
 696                                         connected = IRC_WriteErrClient(Origin,
 697                                                 ERR_NOPRIVILEGES_MSG,
 698                                                 Client_ID(Origin));
 699                         } else if(is_oper || is_machine || is_owner ||
 700                                   is_admin || is_op)
 701                                 x[0] = 'P';
 702                         else
 703                                 connected = IRC_WriteErrClient(Origin,
 704                                         ERR_CHANOPRIVSNEEDED_MSG,
 705                                         Client_ID(Origin),
 706                                         Channel_Name(Channel));
 707                         break;
 708                 /* --- Channel user modes --- */
 709                 case 'q': /* Owner */
 710                 case 'a': /* Channel admin */
 711                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 712                                 connected = IRC_WriteErrClient(Origin,
 713                                         ERR_CHANOPPRIVTOOLOW_MSG,
 714                                         Client_ID(Origin),
 715                                         Channel_Name(Channel));
 716                                 goto chan_exit;
 717                         }
 718                 case 'o': /* Channel operator */
 719                         if(!is_oper && !is_machine && !is_owner &&
 720                            !is_admin && !is_op) {
 721                                 connected = IRC_WriteErrClient(Origin,
 722                                         ERR_CHANOPRIVSNEEDED_MSG,
 723                                         Client_ID(Origin),
 724                                         Channel_Name(Channel));
 725                                 goto chan_exit;
 726                         }
 727                 case 'h': /* Half Op */
 728                         if(!is_oper && !is_machine && !is_owner &&
 729                            !is_admin && !is_op) {
 730                                 connected = IRC_WriteErrClient(Origin,
 731                                         ERR_CHANOPRIVSNEEDED_MSG,
 732                                         Client_ID(Origin),
 733                                         Channel_Name(Channel));
 734                                 goto chan_exit;
 735                         }
 736                 case 'v': /* Voice */
 737                         if (arg_arg > mode_arg) {
 738                                 if (is_oper || is_machine || is_owner ||
 739                                     is_admin || is_op || is_halfop) {
 740                                         client = Client_Search(Req->argv[arg_arg]);
 741                                         if (client)
 742                                                 x[0] = *mode_ptr;
 743                                         else
 744                                                 connected = IRC_WriteErrClient(Origin,
 745                                                         ERR_NOSUCHNICK_MSG,
 746                                                         Client_ID(Origin),
 747                                                         Req->argv[arg_arg]);
 748                                 } else {
 749                                         connected = IRC_WriteErrClient(Origin,
 750                                                 ERR_CHANOPRIVSNEEDED_MSG,
 751                                                 Client_ID(Origin),
 752                                                 Channel_Name(Channel));
 753                                 }
 754                                 Req->argv[arg_arg][0] = '\0';
 755                                 arg_arg++;
 756                         } else {
 757 #ifdef STRICT_RFC
 758                                 /* Report an error to the client, when a user
 759                                  * mode should be changed but no nickname is
 760                                  * given. But don't do it when not in "strict"
 761                                  * mode, because most other servers don't do
 762                                  * it as well and some clients send "wired"
 763                                  * MODE commands like "MODE #chan -ooo nick". */
 764                                 connected = IRC_WriteErrClient(Origin,
 765                                         ERR_NEEDMOREPARAMS_MSG,
 766                                         Client_ID(Origin), Req->command);
 767 #endif
 768                                 goto chan_exit;
 769                         }
 770                         break;
 771                 /* --- Channel lists --- */
 772                 case 'I': /* Invite lists */
 773                 case 'b': /* Ban lists */
 774                 case 'e': /* Channel exception lists */
 775                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 776                                 goto chan_exit;
 777                         if (arg_arg > mode_arg) {
 778                                 /* modify list */
 779                                 if (is_oper || is_machine || is_owner ||
 780                                     is_admin || is_op || is_halfop) {
 781                                         connected = set
 782                                            ? Add_To_List(*mode_ptr, Origin,
 783                                                 Client, Channel,
 784                                                 Req->argv[arg_arg])
 785                                            : Del_From_List(*mode_ptr, Origin,
 786                                                 Client, Channel,
 787                                                 Req->argv[arg_arg]);
 788                                 } else {
 789                                         connected = IRC_WriteErrClient(Origin,
 790                                                 ERR_CHANOPRIVSNEEDED_MSG,
 791                                                 Client_ID(Origin),
 792                                                 Channel_Name(Channel));
 793                                 }
 794                                 Req->argv[arg_arg][0] = '\0';
 795                                 arg_arg++;
 796                         } else {
 797                                 switch (*mode_ptr) {
 798                                 case 'I':
 799                                         Channel_ShowInvites(Origin, Channel);
 800                                         break;
 801                                 case 'b':
 802                                         Channel_ShowBans(Origin, Channel);
 803                                         break;
 804                                 case 'e':
 805                                         Channel_ShowExcepts(Origin, Channel);
 806                                         break;
 807                                 }
 808                         }
 809                         break;
 810                 default:
 811                         if (Client_Type(Client) != CLIENT_SERVER) {
 812                                 Log(LOG_DEBUG,
 813                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 814                                     set ? '+' : '-', *mode_ptr,
 815                                     Client_ID(Origin), Channel_Name(Channel));
 816                                 connected = IRC_WriteErrClient(Origin,
 817                                         ERR_UNKNOWNMODE_MSG,
 818                                         Client_ID(Origin), *mode_ptr,
 819                                         Channel_Name(Channel));
 820                                 x[0] = '\0';
 821                         } else {
 822                                 Log(LOG_DEBUG,
 823                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 824                                     set ? '+' : '-', *mode_ptr,
 825                                     Client_ID(Origin), Channel_Name(Channel));
 826                                 x[0] = *mode_ptr;
 827                         }
 828                 }
 829
 830                 if (!connected)
 831                         break;
 832
 833                 /* Is there a valid mode change? */
 834                 if (!x[0])
 835                         continue;
 836
 837                 /* Validate target client */
 838                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 839                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 840                                                 Client_ID(Origin),
 841                                                 Client_ID(client),
 842                                                 Channel_Name(Channel)))
 843                                 break;
 844                         continue;
 845                 }
 846
 847                 if (client) {
 848                         /* Channel-User-Mode */
 849                         retval = set
 850                                ? Channel_UserModeAdd(Channel, client, x[0])
 851                                : Channel_UserModeDel(Channel, client, x[0]);
 852                         if (retval) {
 853                                 strlcat(the_args, " ", sizeof(the_args));
 854                                 strlcat(the_args, Client_ID(client),
 855                                         sizeof(the_args));
 856                                 strlcat(the_modes, x, sizeof(the_modes));
 857                                 LogDebug
 858                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 859                                      Client_Mask(client), Channel_Name(Channel),
 860                                      Channel_UserModes(Channel, client));
 861                         }
 862                 } else {
 863                         /* Channel-Mode */
 864                         retval = set
 865                                ? Channel_ModeAdd(Channel, x[0])
 866                                : Channel_ModeDel(Channel, x[0]);
 867                         if (retval) {
 868                                 strlcat(the_modes, x, sizeof(the_modes));
 869                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 870                                          Channel_Name(Channel),
 871                                          Channel_Modes(Channel));
 872                         }
 873                 }
 874
 875                 /* Are there additional arguments to add? */
 876                 if (argadd[0]) {
 877                         strlcat(the_args, " ", sizeof(the_args));
 878                         strlcat(the_args, argadd, sizeof(the_args));
 879                 }
 880         }
 881
 882       chan_exit:
 883         /* Are there changed modes? */
 884         if (the_modes[1]) {
 885                 /* Clean up mode string */
 886                 len = strlen(the_modes) - 1;
 887                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 888                         the_modes[len] = '\0';
 889
 890                 if (Client_Type(Client) == CLIENT_SERVER) {
 891                         /* MODE requests for local channels from other servers
 892                          * are definitely invalid! */
 893                         if (Channel_IsLocal(Channel)) {
 894                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 895                                 return CONNECTED;
 896                         }
 897
 898                         /* Forward mode changes to channel users and all the
 899                          * other remote servers: */
 900                         IRC_WriteStrServersPrefix(Client, Origin,
 901                                 "MODE %s %s%s", Channel_Name(Channel),
 902                                 the_modes, the_args);
 903                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 904                                 false, "MODE %s %s%s", Channel_Name(Channel),
 905                                 the_modes, the_args);
 906                 } else {
 907                         if (use_servermode)
 908                                 Origin = Client_ThisServer();
 909                         /* Send reply to client and inform other servers and channel users */
 910                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 911                                         "MODE %s %s%s", Channel_Name(Channel),
 912                                         the_modes, the_args);
 913                         /* Only forward requests for non-local channels */
 914                         if (!Channel_IsLocal(Channel))
 915                                 IRC_WriteStrServersPrefix(Client, Origin,
 916                                         "MODE %s %s%s", Channel_Name(Channel),
 917                                         the_modes, the_args);
 918                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 919                                 false, "MODE %s %s%s", Channel_Name(Channel),
 920                                 the_modes, the_args);
 921                 }
 922         }
 923
 924         return connected;
 925 } /* Channel_Mode */
 926
 927 /**
 928  * Handler for the IRC "AWAY" command.
 929  *
 930  * @param Client The client from which this command has been received.
 931  * @param Req Request structure with prefix and all parameters.
 932  * @return CONNECTED or DISCONNECTED.
 933  */
 934 GLOBAL bool
 935 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 936 {
 937         assert (Client != NULL);
 938         assert (Req != NULL);
 939
 940         if (Req->argc == 1 && Req->argv[0][0]) {
 941                 Client_SetAway(Client, Req->argv[0]);
 942                 Client_ModeAdd(Client, 'a');
 943                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 944                                           Client_ID( Client));
 945                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 946                                           Client_ID( Client));
 947         } else {
 948                 Client_ModeDel(Client, 'a');
 949                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 950                                           Client_ID( Client));
 951                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 952                                           Client_ID( Client));
 953         }
 954 } /* IRC_AWAY */
 955
 956 /**
 957  * Add entries to channel invite, ban and exception lists.
 958  *
 959  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 960  * @param Prefix The originator of the command.
 961  * @param Client The sender of the command.
 962  * @param Channel The channel of which the list should be modified.
 963  * @param Pattern The pattern to add to the list.
 964  * @return CONNECTED or DISCONNECTED.
 965  */
 966 static bool
 967 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 968             const char *Pattern)
 969 {
 970         char mask[MASK_LEN];
 971         struct list_head *list = NULL;
 972         long int current_count;
 973
 974         assert(Client != NULL);
 975         assert(Channel != NULL);
 976         assert(Pattern != NULL);
 977         assert(what == 'I' || what == 'b' || what == 'e');
 978
 979         Lists_MakeMask(Pattern, mask, sizeof(mask));
 980         current_count = Lists_Count(Channel_GetListInvites(Channel))
 981                         + Lists_Count(Channel_GetListExcepts(Channel))
 982                         + Lists_Count(Channel_GetListBans(Channel));
 983
 984         switch(what) {
 985                 case 'I':
 986                         list = Channel_GetListInvites(Channel);
 987                         break;
 988                 case 'b':
 989                         list = Channel_GetListBans(Channel);
 990                         break;
 991                 case 'e':
 992                         list = Channel_GetListExcepts(Channel);
 993                         break;
 994         }
 995
 996         if (Lists_CheckDupeMask(list, mask))
 997                 return CONNECTED;
 998         if (Client_Type(Client) == CLIENT_USER &&
 999             current_count >= MAX_HNDL_CHANNEL_LISTS)
1000                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
1001                                           Client_ID(Client),
1002                                           Channel_Name(Channel), mask,
1003                                           MAX_HNDL_CHANNEL_LISTS);
1004
1005         switch (what) {
1006                 case 'I':
1007                         if (!Channel_AddInvite(Channel, mask, false))
1008                                 return CONNECTED;
1009                         break;
1010                 case 'b':
1011                         if (!Channel_AddBan(Channel, mask))
1012                                 return CONNECTED;
1013                         break;
1014                 case 'e':
1015                         if (!Channel_AddExcept(Channel, mask))
1016                                 return CONNECTED;
1017                         break;
1018         }
1019         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1020 }
1021
1022 /**
1023  * Delete entries from channel invite, ban and exception lists.
1024  *
1025  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1026  * @param Prefix The originator of the command.
1027  * @param Client The sender of the command.
1028  * @param Channel The channel of which the list should be modified.
1029  * @param Pattern The pattern to add to the list.
1030  * @return CONNECTED or DISCONNECTED.
1031  */
1032 static bool
1033 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1034               const char *Pattern)
1035 {
1036         char mask[MASK_LEN];
1037         struct list_head *list = NULL;
1038
1039         assert(Client != NULL);
1040         assert(Channel != NULL);
1041         assert(Pattern != NULL);
1042         assert(what == 'I' || what == 'b' || what == 'e');
1043
1044         Lists_MakeMask(Pattern, mask, sizeof(mask));
1045
1046         switch (what) {
1047                 case 'I':
1048                         list = Channel_GetListInvites(Channel);
1049                         break;
1050                 case 'b':
1051                         list = Channel_GetListBans(Channel);
1052                         break;
1053                 case 'e':
1054                         list = Channel_GetListExcepts(Channel);
1055                         break;
1056         }
1057
1058         if (!Lists_CheckDupeMask(list, mask))
1059                 return CONNECTED;
1060         Lists_Del(list, mask);
1061
1062         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1063 }
1064
1065 /**
1066  * Send information about changed channel invite/ban/exception lists to clients.
1067  *
1068  * @param IsAdd true if the list item has been added, false otherwise.
1069  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1070  * @param Prefix The originator of the mode list change.
1071  * @param Client The sender of the command.
1072  * @param Channel The channel of which the list has been modified.
1073  * @param Mask The mask which has been added or removed.
1074  * @return CONNECTED or DISCONNECTED.
1075  */
1076 static bool
1077 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1078                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1079 {
1080         bool ok = true;
1081
1082         /* Send confirmation to the client */
1083         if (Client_Type(Client) == CLIENT_USER)
1084                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1085                                               Channel_Name(Channel),
1086                                               IsAdd ? '+' : '-',
1087                                               ModeChar, Mask);
1088
1089         /* to other servers */
1090         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1091                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1092                                   ModeChar, Mask);
1093
1094         /* and local users in channel */
1095         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1096                                   "MODE %s %c%c %s", Channel_Name(Channel),
1097                                   IsAdd ? '+' : '-', ModeChar, Mask );
1098
1099         return ok;
1100 } /* Send_ListChange */
1101
1102 /* -eof- */