src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-write.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "parse.h"
  32 #include "messages.h"
  33 #include "conf.h"
  34
  35 #include "exp.h"
  36 #include "irc-mode.h"
  37
  38
  39 static 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 /**
  55  * Handler for the IRC "MODE" command.
  56  *
  57  * See RFC 2812 section 3.1.5 ("user mode message") and section 3.2.3
  58  * ("channel mode message"), and RFC 2811 section 4 ("channel modes").
  59  *
  60  * @param Client        The client from which this command has been received.
  61  * @param Req           Request structure with prefix and all parameters.
  62  * @returns             CONNECTED or DISCONNECTED.
  63  */
  64 GLOBAL bool
  65 IRC_MODE( CLIENT *Client, REQUEST *Req )
  66 {
  67         CLIENT *cl, *origin;
  68         CHANNEL *chan;
  69
  70         assert(Client != NULL);
  71         assert(Req != NULL);
  72
  73         /* No parameters? */
  74         if (Req->argc < 1)
  75                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  76                                           Client_ID(Client), Req->command);
  77
  78         /* Origin for answers */
  79         if (Client_Type(Client) == CLIENT_SERVER) {
  80                 origin = Client_Search(Req->prefix);
  81                 if (!origin)
  82                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  83                                                   Client_ID(Client),
  84                                                   Req->prefix);
  85         } else
  86                 origin = Client;
  87
  88         /* Channel or user mode? */
  89         cl = NULL; chan = NULL;
  90         if (Client_IsValidNick(Req->argv[0]))
  91                 cl = Client_Search(Req->argv[0]);
  92         if (Channel_IsValidName(Req->argv[0]))
  93                 chan = Channel_Search(Req->argv[0]);
  94
  95         if (cl)
  96                 return Client_Mode(Client, Req, origin, cl);
  97         if (chan)
  98                 return Channel_Mode(Client, Req, origin, chan);
  99
 100         /* No target found! */
 101         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 102                         Client_ID(Client), Req->argv[0]);
 103 } /* IRC_MODE */
 104
 105
 106 /**
 107  * Check if the "mode limit" for a client has been reached.
 108  *
 109  * This limit doesn't apply for servers or services!
 110  *
 111  * @param Client The client to check.
 112  * @param Count The number of modes already handled.
 113  * @return true if the limit has been reached.
 114  */
 115 static bool
 116 Mode_Limit_Reached(CLIENT *Client, int Count)
 117 {
 118         if (Client_Type(Client) == CLIENT_SERVER
 119             || Client_Type(Client) == CLIENT_SERVICE)
 120                 return false;
 121         if (Count < MAX_HNDL_MODES_ARG)
 122                 return false;
 123         return true;
 124 }
 125
 126
 127 /**
 128  * Handle client mode requests
 129  *
 130  * @param Client        The client from which this command has been received.
 131  * @param Req           Request structure with prefix and all parameters.
 132  * @param Origin        The originator of the MODE command (prefix).
 133  * @param Target        The target (client) of this MODE command.
 134  * @returns             CONNECTED or DISCONNECTED.
 135  */
 136 static bool
 137 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 138 {
 139         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 140         bool ok, set;
 141         bool send_RPL_HOSTHIDDEN_MSG = false;
 142         int mode_arg;
 143         size_t len;
 144
 145         /* Is the client allowed to request or change the modes? */
 146         if (Client_Type(Client) == CLIENT_USER) {
 147                 /* Users are only allowed to manipulate their own modes! */
 148                 if (Target != Client)
 149                         return IRC_WriteStrClient(Client,
 150                                                   ERR_USERSDONTMATCH_MSG,
 151                                                   Client_ID(Client));
 152         }
 153
 154         /* Mode request: let's answer it :-) */
 155         if (Req->argc == 1)
 156                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 157                                           Client_ID(Origin),
 158                                           Client_Modes(Target));
 159
 160         mode_arg = 1;
 161         mode_ptr = Req->argv[mode_arg];
 162
 163         /* Initial state: set or unset modes? */
 164         if (*mode_ptr == '+') {
 165                 set = true;
 166                 strcpy(the_modes, "+");
 167         } else if (*mode_ptr == '-') {
 168                 set = false;
 169                 strcpy(the_modes, "-");
 170         } else
 171                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 172                                           Client_ID(Origin));
 173
 174         x[1] = '\0';
 175         ok = CONNECTED;
 176         while (mode_ptr) {
 177                 mode_ptr++;
 178                 if (!*mode_ptr) {
 179                         /* Try next argument if there's any */
 180                         mode_arg++;
 181                         if (mode_arg < Req->argc)
 182                                 mode_ptr = Req->argv[mode_arg];
 183                         else
 184                                 break;
 185                 }
 186
 187                 switch(*mode_ptr) {
 188                   case '+':
 189                   case '-':
 190                         if ((*mode_ptr == '+' && !set)
 191                             || (*mode_ptr == '-' && set)) {
 192                                 /* Action modifier ("+"/"-") must be changed */
 193                                 len = strlen(the_modes) - 1;
 194                                 if (the_modes[len] == '+'
 195                                     || the_modes[len] == '-') {
 196                                         /* Last character in the "result
 197                                          * string" was an "action", so just
 198                                          * overwrite it with the new action */
 199                                         the_modes[len] = *mode_ptr;
 200                                 } else {
 201                                         /* Append new modifier character to
 202                                          * the resulting mode string */
 203                                         x[0] = *mode_ptr;
 204                                         strlcat(the_modes, x,
 205                                                 sizeof(the_modes));
 206                                 }
 207                                 if (*mode_ptr == '+')
 208                                         set = true;
 209                                 else
 210                                         set = false;
 211                         }
 212                         continue;
 213                 }
 214
 215                 /* Validate modes */
 216                 x[0] = '\0';
 217                 switch (*mode_ptr) {
 218                 case 'C': /* Only messages from clients sharing a channel */
 219                 case 'i': /* Invisible */
 220                 case 's': /* Server messages */
 221                 case 'w': /* Wallops messages */
 222                         x[0] = *mode_ptr;
 223                         break;
 224                 case 'a': /* Away */
 225                         if (Client_Type(Client) == CLIENT_SERVER) {
 226                                 x[0] = 'a';
 227                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 228                         } else
 229                                 ok = IRC_WriteStrClient(Origin,
 230                                                         ERR_NOPRIVILEGES_MSG,
 231                                                         Client_ID(Origin));
 232                         break;
 233                 case 'B': /* Bot */
 234                         if (Client_HasMode(Client, 'r'))
 235                                 ok = IRC_WriteStrClient(Origin,
 236                                                         ERR_RESTRICTED_MSG,
 237                                                         Client_ID(Origin));
 238                         else
 239                                 x[0] = 'B';
 240                         break;
 241                 case 'c': /* Receive connect notices
 242                            * (only settable by IRC operators!) */
 243                         if (!set || Client_Type(Client) == CLIENT_SERVER
 244                             || Client_OperByMe(Origin))
 245                                 x[0] = 'c';
 246                         else
 247                                 ok = IRC_WriteStrClient(Origin,
 248                                                         ERR_NOPRIVILEGES_MSG,
 249                                                         Client_ID(Origin));
 250                         break;
 251                 case 'o': /* IRC operator (only unsettable!) */
 252                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 253                                 Client_SetOperByMe(Target, false);
 254                                 x[0] = 'o';
 255                         } else
 256                                 ok = IRC_WriteStrClient(Origin,
 257                                                         ERR_NOPRIVILEGES_MSG,
 258                                                         Client_ID(Origin));
 259                         break;
 260                 case 'r': /* Restricted (only settable) */
 261                         if (set || Client_Type(Client) == CLIENT_SERVER)
 262                                 x[0] = 'r';
 263                         else
 264                                 ok = IRC_WriteStrClient(Origin,
 265                                                         ERR_RESTRICTED_MSG,
 266                                                         Client_ID(Origin));
 267                         break;
 268                 case 'R': /* Registered (not [un]settable by clients) */
 269                         if (Client_Type(Client) == CLIENT_SERVER)
 270                                 x[0] = 'R';
 271                         else
 272                                 ok = IRC_WriteStrClient(Origin,
 273                                                         ERR_NICKREGISTER_MSG,
 274                                                         Client_ID(Origin));
 275                         break;
 276                 case 'x': /* Cloak hostname */
 277                         if (Client_HasMode(Client, 'r'))
 278                                 ok = IRC_WriteStrClient(Origin,
 279                                                         ERR_RESTRICTED_MSG,
 280                                                         Client_ID(Origin));
 281                         else if (!set || Conf_CloakHostModeX[0]
 282                                  || Client_Type(Client) == CLIENT_SERVER
 283                                  || Client_OperByMe(Client)) {
 284                                 x[0] = 'x';
 285                                 send_RPL_HOSTHIDDEN_MSG = true;
 286                         } else
 287                                 ok = IRC_WriteStrClient(Origin,
 288                                                         ERR_NOPRIVILEGES_MSG,
 289                                                         Client_ID(Origin));
 290                         break;
 291                 default:
 292                         if (Client_Type(Client) != CLIENT_SERVER) {
 293                                 Log(LOG_DEBUG,
 294                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 295                                     set ? '+' : '-', *mode_ptr,
 296                                     Client_ID(Origin));
 297                                 ok = IRC_WriteStrClient(Origin,
 298                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 299                                                         Client_ID(Origin),
 300                                                         set ? '+' : '-',
 301                                                         *mode_ptr);
 302                                 x[0] = '\0';
 303                         } else {
 304                                 Log(LOG_DEBUG,
 305                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 306                                     set ? '+' : '-', *mode_ptr,
 307                                     Client_ID(Origin), Client_ID(Target));
 308                                 x[0] = *mode_ptr;
 309                         }
 310                 }
 311
 312                 if (!ok)
 313                         break;
 314
 315                 /* Is there a valid mode change? */
 316                 if (!x[0])
 317                         continue;
 318
 319                 if (set) {
 320                         if (Client_ModeAdd(Target, x[0]))
 321                                 strlcat(the_modes, x, sizeof(the_modes));
 322                 } else {
 323                         if (Client_ModeDel(Target, x[0]))
 324                                 strlcat(the_modes, x, sizeof(the_modes));
 325                 }
 326         }
 327
 328         /* Are there changed modes? */
 329         if (the_modes[1]) {
 330                 /* Remove needless action modifier characters */
 331                 len = strlen(the_modes) - 1;
 332                 if (the_modes[len] == '+' || the_modes[len] == '-')
 333                         the_modes[len] = '\0';
 334
 335                 if (Client_Type(Client) == CLIENT_SERVER) {
 336                         /* Forward modes to other servers */
 337                         if (Client_Conn(Target) != NONE) {
 338                                 /* Remote server (service?) changed modes
 339                                  * for one of our clients. Inform it! */
 340                                 IRC_WriteStrClientPrefix(Target, Origin,
 341                                                          "MODE %s :%s",
 342                                                          Client_ID(Target),
 343                                                          the_modes);
 344                         }
 345                         IRC_WriteStrServersPrefix(Client, Origin,
 346                                                   "MODE %s :%s",
 347                                                   Client_ID(Target),
 348                                                   the_modes);
 349                 } else {
 350                         /* Send reply to client and inform other servers */
 351                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 352                                                       "MODE %s :%s",
 353                                                       Client_ID(Target),
 354                                                       the_modes);
 355                         IRC_WriteStrServersPrefix(Client, Origin,
 356                                                   "MODE %s :%s",
 357                                                   Client_ID(Target),
 358                                                   the_modes);
 359                         if (send_RPL_HOSTHIDDEN_MSG)
 360                                 IRC_WriteStrClient(Client, RPL_HOSTHIDDEN_MSG,
 361                                                    Client_ID(Client),
 362                                                    Client_HostnameCloaked(Client));
 363                 }
 364                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 365                          Client_TypeText(Target), Client_Mask(Target),
 366                          Client_Modes(Target));
 367         }
 368
 369         IRC_SetPenalty(Client, 1);
 370         return ok;
 371 } /* Client_Mode */
 372
 373
 374 static bool
 375 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 376 {
 377         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 378         const char *mode_ptr;
 379
 380         /* Member or not? -- That's the question! */
 381         if (!Channel_IsMemberOf(Channel, Origin))
 382                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 383                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 384
 385         /* The sender is a member: generate extended reply */
 386         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 387         mode_ptr = the_modes;
 388         the_args[0] = '\0';
 389
 390         while(*mode_ptr) {
 391                 switch(*mode_ptr) {
 392                 case 'l':
 393                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 394                         strlcat(the_args, argadd, sizeof(the_args));
 395                         break;
 396                 case 'k':
 397                         strlcat(the_args, " ", sizeof(the_args));
 398                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 399                         break;
 400                 }
 401                 mode_ptr++;
 402         }
 403         if (the_args[0])
 404                 strlcat(the_modes, the_args, sizeof(the_modes));
 405
 406         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 407                                 Client_ID(Origin), Channel_Name(Channel),
 408                                 the_modes))
 409                 return DISCONNECTED;
 410 #ifndef STRICT_RFC
 411         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 412                                   Client_ID(Origin), Channel_Name(Channel),
 413                                   Channel_CreationTime(Channel)))
 414                 return DISCONNECTED;
 415 #endif
 416         return CONNECTED;
 417 }
 418
 419
 420 /**
 421  * Handle channel mode and channel-user mode changes
 422  */
 423 static bool
 424 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 425 {
 426         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 427             argadd[CLIENT_PASS_LEN], *mode_ptr, *o_mode_ptr;
 428         bool connected, set, skiponce, retval, use_servermode,
 429              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 430         int mode_arg, arg_arg, mode_arg_count = 0;
 431         CLIENT *client;
 432         long l;
 433         size_t len;
 434
 435         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 436
 437         if (Channel_IsModeless(Channel))
 438                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 439                                 Client_ID(Client), Channel_Name(Channel));
 440
 441         /* Mode request: let's answer it :-) */
 442         if (Req->argc <= 1)
 443                 return Channel_Mode_Answer_Request(Origin, Channel);
 444
 445         /* Check if origin is oper and opers can use mode */
 446         use_servermode = Conf_OperServerMode;
 447         if(Client_OperByMe(Client) && Conf_OperCanMode) {
 448                 is_oper = true;
 449         }
 450
 451         /* Check if client is a server/service */
 452         if(Client_Type(Client) == CLIENT_SERVER ||
 453            Client_Type(Client) == CLIENT_SERVICE) {
 454                 is_machine = true;
 455         }
 456
 457         /* Check if client is member of channel or an oper or an server/service */
 458         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 459                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 460                                           Client_ID(Origin),
 461                                           Channel_Name(Channel));
 462
 463         mode_arg = 1;
 464         mode_ptr = Req->argv[mode_arg];
 465         if (Req->argc > mode_arg + 1)
 466                 arg_arg = mode_arg + 1;
 467         else
 468                 arg_arg = -1;
 469
 470         /* Initial state: set or unset modes? */
 471         skiponce = false;
 472         switch (*mode_ptr) {
 473         case '-':
 474                 set = false;
 475                 break;
 476         case '+':
 477                 set = true;
 478                 break;
 479         default:
 480                 set = true;
 481                 skiponce = true;
 482         }
 483
 484         /* Prepare reply string */
 485         strcpy(the_modes, set ? "+" : "-");
 486         the_args[0] = '\0';
 487
 488         x[1] = '\0';
 489         connected = CONNECTED;
 490         while (mode_ptr) {
 491                 if (!skiponce)
 492                         mode_ptr++;
 493                 if (!*mode_ptr) {
 494                         /* Try next argument if there's any */
 495                         if (arg_arg < 0)
 496                                 break;
 497                         if (arg_arg > mode_arg)
 498                                 mode_arg = arg_arg;
 499                         else
 500                                 mode_arg++;
 501
 502                         if (mode_arg >= Req->argc)
 503                                 break;
 504                         mode_ptr = Req->argv[mode_arg];
 505
 506                         if (Req->argc > mode_arg + 1)
 507                                 arg_arg = mode_arg + 1;
 508                         else
 509                                 arg_arg = -1;
 510                 }
 511                 skiponce = false;
 512
 513                 switch (*mode_ptr) {
 514                 case '+':
 515                 case '-':
 516                         if (((*mode_ptr == '+') && !set)
 517                             || ((*mode_ptr == '-') && set)) {
 518                                 /* Action modifier ("+"/"-") must be changed ... */
 519                                 len = strlen(the_modes) - 1;
 520                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 521                                         /* Adjust last action modifier in result */
 522                                         the_modes[len] = *mode_ptr;
 523                                 } else {
 524                                         /* Append modifier character to result string */
 525                                         x[0] = *mode_ptr;
 526                                         strlcat(the_modes, x, sizeof(the_modes));
 527                                 }
 528                                 set = *mode_ptr == '+';
 529                         }
 530                         continue;
 531                 }
 532
 533                 /* Are there arguments left? */
 534                 if (arg_arg >= Req->argc)
 535                         arg_arg = -1;
 536
 537                 if(!is_machine) {
 538                         o_mode_ptr = Channel_UserModes(Channel, Client);
 539                         while( *o_mode_ptr ) {
 540                                 if ( *o_mode_ptr == 'q')
 541                                         is_owner = true;
 542                                 if ( *o_mode_ptr == 'a')
 543                                         is_admin = true;
 544                                 if ( *o_mode_ptr == 'o')
 545                                         is_op = true;
 546                                 if ( *o_mode_ptr == 'h')
 547                                         is_halfop = true;
 548                                 o_mode_ptr++;
 549                         }
 550                 }
 551
 552                 /* Validate modes */
 553                 x[0] = '\0';
 554                 argadd[0] = '\0';
 555                 client = NULL;
 556                 switch (*mode_ptr) {
 557                 /* --- Channel modes --- */
 558                 case 'R': /* Registered users only */
 559                 case 's': /* Secret channel */
 560                 case 'z': /* Secure connections only */
 561                         if(!is_oper && !is_machine && !is_owner &&
 562                            !is_admin && !is_op) {
 563                                 connected = IRC_WriteStrClient(Origin,
 564                                         ERR_CHANOPRIVSNEEDED_MSG,
 565                                         Client_ID(Origin), Channel_Name(Channel));
 566                                 goto chan_exit;
 567                         }
 568                 case 'i': /* Invite only */
 569                 case 'V': /* Invite disallow */
 570                 case 'M': /* Only identified nicks can write */
 571                 case 'm': /* Moderated */
 572                 case 'n': /* Only members can write */
 573                 case 't': /* Topic locked */
 574                         if(is_oper || is_machine || is_owner ||
 575                            is_admin || is_op || is_halfop)
 576                                 x[0] = *mode_ptr;
 577                         else
 578                                 connected = IRC_WriteStrClient(Origin,
 579                                         ERR_CHANOPRIVSNEEDED_MSG,
 580                                         Client_ID(Origin), Channel_Name(Channel));
 581                         break;
 582                 case 'k': /* Channel key */
 583                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 584                                 goto chan_exit;
 585                         if (!set) {
 586                                 if (is_oper || is_machine || is_owner ||
 587                                     is_admin || is_op || is_halfop)
 588                                         x[0] = *mode_ptr;
 589                                 else
 590                                         connected = IRC_WriteStrClient(Origin,
 591                                                 ERR_CHANOPRIVSNEEDED_MSG,
 592                                                 Client_ID(Origin),
 593                                                 Channel_Name(Channel));
 594                                 break;
 595                         }
 596                         if (arg_arg > mode_arg) {
 597                                 if (is_oper || is_machine || is_owner ||
 598                                     is_admin || is_op || is_halfop) {
 599                                         Channel_ModeDel(Channel, 'k');
 600                                         Channel_SetKey(Channel,
 601                                                        Req->argv[arg_arg]);
 602                                         strlcpy(argadd, Channel_Key(Channel),
 603                                                 sizeof(argadd));
 604                                         x[0] = *mode_ptr;
 605                                 } else {
 606                                         connected = IRC_WriteStrClient(Origin,
 607                                                 ERR_CHANOPRIVSNEEDED_MSG,
 608                                                 Client_ID(Origin),
 609                                                 Channel_Name(Channel));
 610                                 }
 611                                 Req->argv[arg_arg][0] = '\0';
 612                                 arg_arg++;
 613                         } else {
 614                                 connected = IRC_WriteStrClient(Origin,
 615                                         ERR_NEEDMOREPARAMS_MSG,
 616                                         Client_ID(Origin), Req->command);
 617                                 goto chan_exit;
 618                         }
 619                         break;
 620                 case 'l': /* Member limit */
 621                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 622                                 goto chan_exit;
 623                         if (!set) {
 624                                 if (is_oper || is_machine || is_owner ||
 625                                     is_admin || is_op || is_halfop)
 626                                         x[0] = *mode_ptr;
 627                                 else
 628                                         connected = IRC_WriteStrClient(Origin,
 629                                                 ERR_CHANOPRIVSNEEDED_MSG,
 630                                                 Client_ID(Origin),
 631                                                 Channel_Name(Channel));
 632                                 break;
 633                         }
 634                         if (arg_arg > mode_arg) {
 635                                 if (is_oper || is_machine || is_owner ||
 636                                     is_admin || is_op || is_halfop) {
 637                                         l = atol(Req->argv[arg_arg]);
 638                                         if (l > 0 && l < 0xFFFF) {
 639                                                 Channel_ModeDel(Channel, 'l');
 640                                                 Channel_SetMaxUsers(Channel, l);
 641                                                 snprintf(argadd, sizeof(argadd),
 642                                                          "%ld", l);
 643                                                 x[0] = *mode_ptr;
 644                                         }
 645                                 } else {
 646                                         connected = IRC_WriteStrClient(Origin,
 647                                                 ERR_CHANOPRIVSNEEDED_MSG,
 648                                                 Client_ID(Origin),
 649                                                 Channel_Name(Channel));
 650                                 }
 651                                 Req->argv[arg_arg][0] = '\0';
 652                                 arg_arg++;
 653                         } else {
 654                                 connected = IRC_WriteStrClient(Origin,
 655                                         ERR_NEEDMOREPARAMS_MSG,
 656                                         Client_ID(Origin), Req->command);
 657                                 goto chan_exit;
 658                         }
 659                         break;
 660                 case 'O': /* IRC operators only */
 661                         if (set) {
 662                                 /* Only IRC operators are allowed to
 663                                  * set the 'O' channel mode! */
 664                                 if(is_oper || is_machine)
 665                                         x[0] = 'O';
 666                                 else
 667                                         connected = IRC_WriteStrClient(Origin,
 668                                                 ERR_NOPRIVILEGES_MSG,
 669                                                 Client_ID(Origin));
 670                         } else if(is_oper || is_machine || is_owner ||
 671                                   is_admin || is_op)
 672                                 x[0] = 'O';
 673                         else
 674                                 connected = IRC_WriteStrClient(Origin,
 675                                         ERR_CHANOPRIVSNEEDED_MSG,
 676                                         Client_ID(Origin),
 677                                         Channel_Name(Channel));
 678                         break;
 679                 case 'P': /* Persistent channel */
 680                         if (set) {
 681                                 /* Only IRC operators are allowed to
 682                                  * set the 'P' channel mode! */
 683                                 if(is_oper || is_machine)
 684                                         x[0] = 'P';
 685                                 else
 686                                         connected = IRC_WriteStrClient(Origin,
 687                                                 ERR_NOPRIVILEGES_MSG,
 688                                                 Client_ID(Origin));
 689                         } else if(is_oper || is_machine || is_owner ||
 690                                   is_admin || is_op)
 691                                 x[0] = 'P';
 692                         else
 693                                 connected = IRC_WriteStrClient(Origin,
 694                                         ERR_CHANOPRIVSNEEDED_MSG,
 695                                         Client_ID(Origin),
 696                                         Channel_Name(Channel));
 697                         break;
 698                 /* --- Channel user modes --- */
 699                 case 'q': /* Owner */
 700                 case 'a': /* Channel admin */
 701                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 702                                 connected = IRC_WriteStrClient(Origin,
 703                                         ERR_CHANOPPRIVTOOLOW_MSG,
 704                                         Client_ID(Origin),
 705                                         Channel_Name(Channel));
 706                                 goto chan_exit;
 707                         }
 708                 case 'o': /* Channel operator */
 709                         if(!is_oper && !is_machine && !is_owner &&
 710                            !is_admin && !is_op) {
 711                                 connected = IRC_WriteStrClient(Origin,
 712                                         ERR_CHANOPRIVSNEEDED_MSG,
 713                                         Client_ID(Origin),
 714                                         Channel_Name(Channel));
 715                                 goto chan_exit;
 716                         }
 717                 case 'h': /* Half Op */
 718                         if(!is_oper && !is_machine && !is_owner &&
 719                            !is_admin && !is_op) {
 720                                 connected = IRC_WriteStrClient(Origin,
 721                                         ERR_CHANOPRIVSNEEDED_MSG,
 722                                         Client_ID(Origin),
 723                                         Channel_Name(Channel));
 724                                 goto chan_exit;
 725                         }
 726                 case 'v': /* Voice */
 727                         if (arg_arg > mode_arg) {
 728                                 if (is_oper || is_machine || is_owner ||
 729                                     is_admin || is_op || is_halfop) {
 730                                         client = Client_Search(Req->argv[arg_arg]);
 731                                         if (client)
 732                                                 x[0] = *mode_ptr;
 733                                         else
 734                                                 connected = IRC_WriteStrClient(Origin,
 735                                                         ERR_NOSUCHNICK_MSG,
 736                                                         Client_ID(Origin),
 737                                                         Req->argv[arg_arg]);
 738                                 } else {
 739                                         connected = IRC_WriteStrClient(Origin,
 740                                                 ERR_CHANOPRIVSNEEDED_MSG,
 741                                                 Client_ID(Origin),
 742                                                 Channel_Name(Channel));
 743                                 }
 744                                 Req->argv[arg_arg][0] = '\0';
 745                                 arg_arg++;
 746                         } else {
 747                                 connected = IRC_WriteStrClient(Origin,
 748                                         ERR_NEEDMOREPARAMS_MSG,
 749                                         Client_ID(Origin), Req->command);
 750                                 goto chan_exit;
 751                         }
 752                         break;
 753                 /* --- Channel lists --- */
 754                 case 'I': /* Invite lists */
 755                 case 'b': /* Ban lists */
 756                 case 'e': /* Channel exception lists */
 757                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 758                                 goto chan_exit;
 759                         if (arg_arg > mode_arg) {
 760                                 /* modify list */
 761                                 if (is_oper || is_machine || is_owner ||
 762                                     is_admin || is_op || is_halfop) {
 763                                         connected = set
 764                                            ? Add_To_List(*mode_ptr, Origin,
 765                                                 Client, Channel,
 766                                                 Req->argv[arg_arg])
 767                                            : Del_From_List(*mode_ptr, Origin,
 768                                                 Client, Channel,
 769                                                 Req->argv[arg_arg]);
 770                                 } else {
 771                                         connected = IRC_WriteStrClient(Origin,
 772                                                 ERR_CHANOPRIVSNEEDED_MSG,
 773                                                 Client_ID(Origin),
 774                                                 Channel_Name(Channel));
 775                                 }
 776                                 Req->argv[arg_arg][0] = '\0';
 777                                 arg_arg++;
 778                         } else {
 779                                 switch (*mode_ptr) {
 780                                 case 'I':
 781                                         Channel_ShowInvites(Origin, Channel);
 782                                         break;
 783                                 case 'b':
 784                                         Channel_ShowBans(Origin, Channel);
 785                                         break;
 786                                 case 'e':
 787                                         Channel_ShowExcepts(Origin, Channel);
 788                                         break;
 789                                 }
 790                         }
 791                         break;
 792                 default:
 793                         if (Client_Type(Client) != CLIENT_SERVER) {
 794                                 Log(LOG_DEBUG,
 795                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 796                                     set ? '+' : '-', *mode_ptr,
 797                                     Client_ID(Origin), Channel_Name(Channel));
 798                                 connected = IRC_WriteStrClient(Origin,
 799                                         ERR_UNKNOWNMODE_MSG,
 800                                         Client_ID(Origin), *mode_ptr,
 801                                         Channel_Name(Channel));
 802                                 x[0] = '\0';
 803                         } else {
 804                                 Log(LOG_DEBUG,
 805                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 806                                     set ? '+' : '-', *mode_ptr,
 807                                     Client_ID(Origin), Channel_Name(Channel));
 808                                 x[0] = *mode_ptr;
 809                         }
 810                 }
 811
 812                 if (!connected)
 813                         break;
 814
 815                 /* Is there a valid mode change? */
 816                 if (!x[0])
 817                         continue;
 818
 819                 /* Validate target client */
 820                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 821                         if (!IRC_WriteStrClient
 822                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 823                              Client_ID(Origin), Client_ID(client),
 824                              Channel_Name(Channel)))
 825                                 break;
 826
 827                         continue;
 828                 }
 829
 830                 if (client) {
 831                         /* Channel-User-Mode */
 832                         retval = set
 833                                ? Channel_UserModeAdd(Channel, client, x[0])
 834                                : Channel_UserModeDel(Channel, client, x[0]);
 835                         if (retval) {
 836                                 strlcat(the_args, " ", sizeof(the_args));
 837                                 strlcat(the_args, Client_ID(client),
 838                                         sizeof(the_args));
 839                                 strlcat(the_modes, x, sizeof(the_modes));
 840                                 LogDebug
 841                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 842                                      Client_Mask(client), Channel_Name(Channel),
 843                                      Channel_UserModes(Channel, client));
 844                         }
 845                 } else {
 846                         /* Channel-Mode */
 847                         retval = set
 848                                ? Channel_ModeAdd(Channel, x[0])
 849                                : Channel_ModeDel(Channel, x[0]);
 850                         if (retval) {
 851                                 strlcat(the_modes, x, sizeof(the_modes));
 852                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 853                                          Channel_Name(Channel),
 854                                          Channel_Modes(Channel));
 855                         }
 856                 }
 857
 858                 /* Are there additional arguments to add? */
 859                 if (argadd[0]) {
 860                         strlcat(the_args, " ", sizeof(the_args));
 861                         strlcat(the_args, argadd, sizeof(the_args));
 862                 }
 863         }
 864
 865       chan_exit:
 866         /* Are there changed modes? */
 867         if (the_modes[1]) {
 868                 /* Clean up mode string */
 869                 len = strlen(the_modes) - 1;
 870                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 871                         the_modes[len] = '\0';
 872
 873                 if (Client_Type(Client) == CLIENT_SERVER) {
 874                         /* MODE requests for local channels from other servers
 875                          * are definitely invalid! */
 876                         if (Channel_IsLocal(Channel)) {
 877                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 878                                 return CONNECTED;
 879                         }
 880
 881                         /* Forward mode changes to channel users and all the
 882                          * other remote servers: */
 883                         IRC_WriteStrServersPrefix(Client, Origin,
 884                                 "MODE %s %s%s", Channel_Name(Channel),
 885                                 the_modes, the_args);
 886                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 887                                 false, "MODE %s %s%s", Channel_Name(Channel),
 888                                 the_modes, the_args);
 889                 } else {
 890                         if (use_servermode)
 891                                 Origin = Client_ThisServer();
 892                         /* Send reply to client and inform other servers and channel users */
 893                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 894                                         "MODE %s %s%s", Channel_Name(Channel),
 895                                         the_modes, the_args);
 896                         /* Only forward requests for non-local channels */
 897                         if (!Channel_IsLocal(Channel))
 898                                 IRC_WriteStrServersPrefix(Client, Origin,
 899                                         "MODE %s %s%s", Channel_Name(Channel),
 900                                         the_modes, the_args);
 901                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 902                                 false, "MODE %s %s%s", Channel_Name(Channel),
 903                                 the_modes, the_args);
 904                 }
 905         }
 906
 907         IRC_SetPenalty(Client, 1);
 908         return connected;
 909 } /* Channel_Mode */
 910
 911
 912 GLOBAL bool
 913 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 914 {
 915         assert( Client != NULL );
 916         assert( Req != NULL );
 917
 918         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 919
 920         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 921         {
 922                 Client_SetAway( Client, Req->argv[0] );
 923                 Client_ModeAdd( Client, 'a' );
 924                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 925                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 926         }
 927         else
 928         {
 929                 Client_ModeDel( Client, 'a' );
 930                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 931                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 932         }
 933 } /* IRC_AWAY */
 934
 935
 936 /**
 937  * Add entries to channel invite, ban and exception lists.
 938  *
 939  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 940  * @param Prefix The originator of the command.
 941  * @param Client The sender of the command.
 942  * @param Channel The channel of which the list should be modified.
 943  * @param Pattern The pattern to add to the list.
 944  * @return CONNECTED or DISCONNECTED.
 945  */
 946 static bool
 947 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 948             const char *Pattern)
 949 {
 950         const char *mask;
 951         struct list_head *list = NULL;
 952         long int current_count;
 953
 954         assert(Client != NULL);
 955         assert(Channel != NULL);
 956         assert(Pattern != NULL);
 957         assert(what == 'I' || what == 'b' || what == 'e');
 958
 959         mask = Lists_MakeMask(Pattern);
 960         current_count = Lists_Count(Channel_GetListInvites(Channel))
 961                         + Lists_Count(Channel_GetListExcepts(Channel))
 962                         + Lists_Count(Channel_GetListBans(Channel));
 963
 964         switch(what) {
 965                 case 'I':
 966                         list = Channel_GetListInvites(Channel);
 967                         break;
 968                 case 'b':
 969                         list = Channel_GetListBans(Channel);
 970                         break;
 971                 case 'e':
 972                         list = Channel_GetListExcepts(Channel);
 973                         break;
 974         }
 975
 976         if (Lists_CheckDupeMask(list, mask))
 977                 return CONNECTED;
 978         if (Client_Type(Client) == CLIENT_USER &&
 979             current_count >= MAX_HNDL_CHANNEL_LISTS)
 980                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
 981                                           Client_ID(Client),
 982                                           Channel_Name(Channel), mask,
 983                                           MAX_HNDL_CHANNEL_LISTS);
 984
 985         switch (what) {
 986                 case 'I':
 987                         if (!Channel_AddInvite(Channel, mask, false))
 988                                 return CONNECTED;
 989                         break;
 990                 case 'b':
 991                         if (!Channel_AddBan(Channel, mask))
 992                                 return CONNECTED;
 993                         break;
 994                 case 'e':
 995                         if (!Channel_AddExcept(Channel, mask))
 996                                 return CONNECTED;
 997                         break;
 998         }
 999         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1000 }
1001
1002
1003 /**
1004  * Delete entries from channel invite, ban and exeption lists.
1005  *
1006  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1007  * @param Prefix The originator of the command.
1008  * @param Client The sender of the command.
1009  * @param Channel The channel of which the list should be modified.
1010  * @param Pattern The pattern to add to the list.
1011  * @return CONNECTED or DISCONNECTED.
1012  */
1013 static bool
1014 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1015               const char *Pattern)
1016 {
1017         const char *mask;
1018         struct list_head *list = NULL;
1019
1020         assert(Client != NULL);
1021         assert(Channel != NULL);
1022         assert(Pattern != NULL);
1023         assert(what == 'I' || what == 'b' || what == 'e');
1024
1025         mask = Lists_MakeMask(Pattern);
1026
1027         switch (what) {
1028                 case 'I':
1029                         list = Channel_GetListInvites(Channel);
1030                         break;
1031                 case 'b':
1032                         list = Channel_GetListBans(Channel);
1033                         break;
1034                 case 'e':
1035                         list = Channel_GetListExcepts(Channel);
1036                         break;
1037         }
1038
1039         if (!Lists_CheckDupeMask(list, mask))
1040                 return CONNECTED;
1041         Lists_Del(list, mask);
1042
1043         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1044 }
1045
1046
1047 /**
1048  * Send information about changed channel invite/ban/exception lists to clients.
1049  *
1050  * @param IsAdd true if the list item has been added, false otherwise.
1051  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1052  * @param Prefix The originator of the mode list change.
1053  * @param Client The sender of the command.
1054  * @param Channel The channel of which the list has been modified.
1055  * @param Mask The mask which has been added or removed.
1056  * @return CONNECTED or DISCONNECTED.
1057  */
1058 static bool
1059 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1060                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1061 {
1062         bool ok = true;
1063
1064         /* Send confirmation to the client */
1065         if (Client_Type(Client) == CLIENT_USER)
1066                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1067                                               Channel_Name(Channel),
1068                                               IsAdd ? '+' : '-',
1069                                               ModeChar, Mask);
1070
1071         /* to other servers */
1072         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1073                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1074                                   ModeChar, Mask);
1075
1076         /* and local users in channel */
1077         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1078                                   "MODE %s %c%c %s", Channel_Name(Channel),
1079                                   IsAdd ? '+' : '-', ModeChar, Mask );
1080
1081         return ok;
1082 } /* Send_ListChange */
1083
1084
1085 /* -eof- */