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(Target),
 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 'b': /* Block private msgs */
 219                 case 'C': /* Only messages from clients sharing a channel */
 220                 case 'i': /* Invisible */
 221                 case 's': /* Server messages */
 222                 case 'w': /* Wallops messages */
 223                         x[0] = *mode_ptr;
 224                         break;
 225                 case 'a': /* Away */
 226                         if (Client_Type(Client) == CLIENT_SERVER) {
 227                                 x[0] = 'a';
 228                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 229                         } else
 230                                 ok = IRC_WriteStrClient(Origin,
 231                                                         ERR_NOPRIVILEGES_MSG,
 232                                                         Client_ID(Origin));
 233                         break;
 234                 case 'B': /* Bot */
 235                         if (Client_HasMode(Client, 'r'))
 236                                 ok = IRC_WriteStrClient(Origin,
 237                                                         ERR_RESTRICTED_MSG,
 238                                                         Client_ID(Origin));
 239                         else
 240                                 x[0] = 'B';
 241                         break;
 242                 case 'c': /* Receive connect notices
 243                            * (only settable by IRC operators!) */
 244                         if (!set || Client_Type(Client) == CLIENT_SERVER
 245                             || Client_OperByMe(Origin))
 246                                 x[0] = 'c';
 247                         else
 248                                 ok = IRC_WriteStrClient(Origin,
 249                                                         ERR_NOPRIVILEGES_MSG,
 250                                                         Client_ID(Origin));
 251                         break;
 252                 case 'o': /* IRC operator (only unsettable!) */
 253                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 254                                 Client_SetOperByMe(Target, false);
 255                                 x[0] = 'o';
 256                         } else
 257                                 ok = IRC_WriteStrClient(Origin,
 258                                                         ERR_NOPRIVILEGES_MSG,
 259                                                         Client_ID(Origin));
 260                         break;
 261                 case 'q': /* KICK-protected user */
 262                         if (!set || Client_Type(Client) == CLIENT_SERVER
 263                             || Client_OperByMe(Origin))
 264                                 x[0] = 'q';
 265                         else
 266                                 ok = IRC_WriteStrClient(Origin,
 267                                                         ERR_NOPRIVILEGES_MSG,
 268                                                         Client_ID(Origin));
 269                         break;
 270                 case 'r': /* Restricted (only settable) */
 271                         if (set || Client_Type(Client) == CLIENT_SERVER)
 272                                 x[0] = 'r';
 273                         else
 274                                 ok = IRC_WriteStrClient(Origin,
 275                                                         ERR_RESTRICTED_MSG,
 276                                                         Client_ID(Origin));
 277                         break;
 278                 case 'R': /* Registered (not [un]settable by clients) */
 279                         if (Client_Type(Client) == CLIENT_SERVER)
 280                                 x[0] = 'R';
 281                         else
 282                                 ok = IRC_WriteStrClient(Origin,
 283                                                         ERR_NICKREGISTER_MSG,
 284                                                         Client_ID(Origin));
 285                         break;
 286                 case 'x': /* Cloak hostname */
 287                         if (Client_HasMode(Client, 'r'))
 288                                 ok = IRC_WriteStrClient(Origin,
 289                                                         ERR_RESTRICTED_MSG,
 290                                                         Client_ID(Origin));
 291                         else if (!set || Conf_CloakHostModeX[0]
 292                                  || Client_Type(Client) == CLIENT_SERVER
 293                                  || Client_OperByMe(Client)) {
 294                                 x[0] = 'x';
 295                                 send_RPL_HOSTHIDDEN_MSG = true;
 296                         } else
 297                                 ok = IRC_WriteStrClient(Origin,
 298                                                         ERR_NOPRIVILEGES_MSG,
 299                                                         Client_ID(Origin));
 300                         break;
 301                 default:
 302                         if (Client_Type(Client) != CLIENT_SERVER) {
 303                                 Log(LOG_DEBUG,
 304                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 305                                     set ? '+' : '-', *mode_ptr,
 306                                     Client_ID(Origin));
 307                                 ok = IRC_WriteStrClient(Origin,
 308                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 309                                                         Client_ID(Origin),
 310                                                         set ? '+' : '-',
 311                                                         *mode_ptr);
 312                                 x[0] = '\0';
 313                         } else {
 314                                 Log(LOG_DEBUG,
 315                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 316                                     set ? '+' : '-', *mode_ptr,
 317                                     Client_ID(Origin), Client_ID(Target));
 318                                 x[0] = *mode_ptr;
 319                         }
 320                 }
 321
 322                 if (!ok)
 323                         break;
 324
 325                 /* Is there a valid mode change? */
 326                 if (!x[0])
 327                         continue;
 328
 329                 if (set) {
 330                         if (Client_ModeAdd(Target, x[0]))
 331                                 strlcat(the_modes, x, sizeof(the_modes));
 332                 } else {
 333                         if (Client_ModeDel(Target, x[0]))
 334                                 strlcat(the_modes, x, sizeof(the_modes));
 335                 }
 336         }
 337
 338         /* Are there changed modes? */
 339         if (the_modes[1]) {
 340                 /* Remove needless action modifier characters */
 341                 len = strlen(the_modes) - 1;
 342                 if (the_modes[len] == '+' || the_modes[len] == '-')
 343                         the_modes[len] = '\0';
 344
 345                 if (Client_Type(Client) == CLIENT_SERVER) {
 346                         /* Forward modes to other servers */
 347                         if (Client_Conn(Target) != NONE) {
 348                                 /* Remote server (service?) changed modes
 349                                  * for one of our clients. Inform it! */
 350                                 IRC_WriteStrClientPrefix(Target, Origin,
 351                                                          "MODE %s :%s",
 352                                                          Client_ID(Target),
 353                                                          the_modes);
 354                         }
 355                         IRC_WriteStrServersPrefix(Client, Origin,
 356                                                   "MODE %s :%s",
 357                                                   Client_ID(Target),
 358                                                   the_modes);
 359                 } else {
 360                         /* Send reply to client and inform other servers */
 361                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 362                                                       "MODE %s :%s",
 363                                                       Client_ID(Target),
 364                                                       the_modes);
 365                         IRC_WriteStrServersPrefix(Client, Origin,
 366                                                   "MODE %s :%s",
 367                                                   Client_ID(Target),
 368                                                   the_modes);
 369                 }
 370
 371                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 372                         /* A new (cloaked) hostname must be annoucned */
 373                         IRC_WriteStrClientPrefix(Target, Origin,
 374                                                  RPL_HOSTHIDDEN_MSG,
 375                                                  Client_ID(Target),
 376                                                  Client_HostnameDisplayed(Target));
 377
 378                 }
 379
 380                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 381                          Client_TypeText(Target), Client_Mask(Target),
 382                          Client_Modes(Target));
 383         }
 384
 385         IRC_SetPenalty(Client, 1);
 386         return ok;
 387 } /* Client_Mode */
 388
 389
 390 static bool
 391 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 392 {
 393         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 394         const char *mode_ptr;
 395
 396         /* Member or not? -- That's the question! */
 397         if (!Channel_IsMemberOf(Channel, Origin))
 398                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 399                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 400
 401         /* The sender is a member: generate extended reply */
 402         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 403         mode_ptr = the_modes;
 404         the_args[0] = '\0';
 405
 406         while(*mode_ptr) {
 407                 switch(*mode_ptr) {
 408                 case 'l':
 409                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 410                         strlcat(the_args, argadd, sizeof(the_args));
 411                         break;
 412                 case 'k':
 413                         strlcat(the_args, " ", sizeof(the_args));
 414                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 415                         break;
 416                 }
 417                 mode_ptr++;
 418         }
 419         if (the_args[0])
 420                 strlcat(the_modes, the_args, sizeof(the_modes));
 421
 422         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 423                                 Client_ID(Origin), Channel_Name(Channel),
 424                                 the_modes))
 425                 return DISCONNECTED;
 426 #ifndef STRICT_RFC
 427         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 428                                   Client_ID(Origin), Channel_Name(Channel),
 429                                   Channel_CreationTime(Channel)))
 430                 return DISCONNECTED;
 431 #endif
 432         return CONNECTED;
 433 }
 434
 435
 436 /**
 437  * Handle channel mode and channel-user mode changes
 438  */
 439 static bool
 440 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 441 {
 442         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 443             argadd[CLIENT_PASS_LEN], *mode_ptr, *o_mode_ptr;
 444         bool connected, set, skiponce, retval, use_servermode,
 445              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 446         int mode_arg, arg_arg, mode_arg_count = 0;
 447         CLIENT *client;
 448         long l;
 449         size_t len;
 450
 451         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 452
 453         if (Channel_IsModeless(Channel))
 454                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 455                                 Client_ID(Client), Channel_Name(Channel));
 456
 457         /* Mode request: let's answer it :-) */
 458         if (Req->argc <= 1)
 459                 return Channel_Mode_Answer_Request(Origin, Channel);
 460
 461         /* Check if origin is oper and opers can use mode */
 462         use_servermode = Conf_OperServerMode;
 463         if(Client_OperByMe(Client) && Conf_OperCanMode) {
 464                 is_oper = true;
 465         }
 466
 467         /* Check if client is a server/service */
 468         if(Client_Type(Client) == CLIENT_SERVER ||
 469            Client_Type(Client) == CLIENT_SERVICE) {
 470                 is_machine = true;
 471         }
 472
 473         /* Check if client is member of channel or an oper or an server/service */
 474         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 475                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 476                                           Client_ID(Origin),
 477                                           Channel_Name(Channel));
 478
 479         mode_arg = 1;
 480         mode_ptr = Req->argv[mode_arg];
 481         if (Req->argc > mode_arg + 1)
 482                 arg_arg = mode_arg + 1;
 483         else
 484                 arg_arg = -1;
 485
 486         /* Initial state: set or unset modes? */
 487         skiponce = false;
 488         switch (*mode_ptr) {
 489         case '-':
 490                 set = false;
 491                 break;
 492         case '+':
 493                 set = true;
 494                 break;
 495         default:
 496                 set = true;
 497                 skiponce = true;
 498         }
 499
 500         /* Prepare reply string */
 501         strcpy(the_modes, set ? "+" : "-");
 502         the_args[0] = '\0';
 503
 504         x[1] = '\0';
 505         connected = CONNECTED;
 506         while (mode_ptr) {
 507                 if (!skiponce)
 508                         mode_ptr++;
 509                 if (!*mode_ptr) {
 510                         /* Try next argument if there's any */
 511                         if (arg_arg < 0)
 512                                 break;
 513                         if (arg_arg > mode_arg)
 514                                 mode_arg = arg_arg;
 515                         else
 516                                 mode_arg++;
 517
 518                         if (mode_arg >= Req->argc)
 519                                 break;
 520                         mode_ptr = Req->argv[mode_arg];
 521
 522                         if (Req->argc > mode_arg + 1)
 523                                 arg_arg = mode_arg + 1;
 524                         else
 525                                 arg_arg = -1;
 526                 }
 527                 skiponce = false;
 528
 529                 switch (*mode_ptr) {
 530                 case '+':
 531                 case '-':
 532                         if (((*mode_ptr == '+') && !set)
 533                             || ((*mode_ptr == '-') && set)) {
 534                                 /* Action modifier ("+"/"-") must be changed ... */
 535                                 len = strlen(the_modes) - 1;
 536                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 537                                         /* Adjust last action modifier in result */
 538                                         the_modes[len] = *mode_ptr;
 539                                 } else {
 540                                         /* Append modifier character to result string */
 541                                         x[0] = *mode_ptr;
 542                                         strlcat(the_modes, x, sizeof(the_modes));
 543                                 }
 544                                 set = *mode_ptr == '+';
 545                         }
 546                         continue;
 547                 }
 548
 549                 /* Are there arguments left? */
 550                 if (arg_arg >= Req->argc)
 551                         arg_arg = -1;
 552
 553                 if(!is_machine && !is_oper) {
 554                         o_mode_ptr = Channel_UserModes(Channel, Client);
 555                         while( *o_mode_ptr ) {
 556                                 if ( *o_mode_ptr == 'q')
 557                                         is_owner = true;
 558                                 if ( *o_mode_ptr == 'a')
 559                                         is_admin = true;
 560                                 if ( *o_mode_ptr == 'o')
 561                                         is_op = true;
 562                                 if ( *o_mode_ptr == 'h')
 563                                         is_halfop = true;
 564                                 o_mode_ptr++;
 565                         }
 566                 }
 567
 568                 /* Validate modes */
 569                 x[0] = '\0';
 570                 argadd[0] = '\0';
 571                 client = NULL;
 572                 switch (*mode_ptr) {
 573                 /* --- Channel modes --- */
 574                 case 'R': /* Registered users only */
 575                 case 's': /* Secret channel */
 576                 case 'z': /* Secure connections only */
 577                         if(!is_oper && !is_machine && !is_owner &&
 578                            !is_admin && !is_op) {
 579                                 connected = IRC_WriteStrClient(Origin,
 580                                         ERR_CHANOPRIVSNEEDED_MSG,
 581                                         Client_ID(Origin), Channel_Name(Channel));
 582                                 goto chan_exit;
 583                         }
 584                 case 'i': /* Invite only */
 585                 case 'V': /* Invite disallow */
 586                 case 'M': /* Only identified nicks can write */
 587                 case 'm': /* Moderated */
 588                 case 'n': /* Only members can write */
 589                 case 'Q': /* No kicks */
 590                 case 't': /* Topic locked */
 591                         if(is_oper || is_machine || is_owner ||
 592                            is_admin || is_op || is_halfop)
 593                                 x[0] = *mode_ptr;
 594                         else
 595                                 connected = IRC_WriteStrClient(Origin,
 596                                         ERR_CHANOPRIVSNEEDED_MSG,
 597                                         Client_ID(Origin), Channel_Name(Channel));
 598                         break;
 599                 case 'k': /* Channel key */
 600                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 601                                 goto chan_exit;
 602                         if (!set) {
 603                                 if (is_oper || is_machine || is_owner ||
 604                                     is_admin || is_op || is_halfop)
 605                                         x[0] = *mode_ptr;
 606                                 else
 607                                         connected = IRC_WriteStrClient(Origin,
 608                                                 ERR_CHANOPRIVSNEEDED_MSG,
 609                                                 Client_ID(Origin),
 610                                                 Channel_Name(Channel));
 611                                 break;
 612                         }
 613                         if (arg_arg > mode_arg) {
 614                                 if (is_oper || is_machine || is_owner ||
 615                                     is_admin || is_op || is_halfop) {
 616                                         Channel_ModeDel(Channel, 'k');
 617                                         Channel_SetKey(Channel,
 618                                                        Req->argv[arg_arg]);
 619                                         strlcpy(argadd, Channel_Key(Channel),
 620                                                 sizeof(argadd));
 621                                         x[0] = *mode_ptr;
 622                                 } else {
 623                                         connected = IRC_WriteStrClient(Origin,
 624                                                 ERR_CHANOPRIVSNEEDED_MSG,
 625                                                 Client_ID(Origin),
 626                                                 Channel_Name(Channel));
 627                                 }
 628                                 Req->argv[arg_arg][0] = '\0';
 629                                 arg_arg++;
 630                         } else {
 631 #ifdef STRICT_RFC
 632                                 /* Only send error message in "strict" mode,
 633                                  * this is how ircd2.11 and others behave ... */
 634                                 connected = IRC_WriteStrClient(Origin,
 635                                         ERR_NEEDMOREPARAMS_MSG,
 636                                         Client_ID(Origin), Req->command);
 637 #endif
 638                                 goto chan_exit;
 639                         }
 640                         break;
 641                 case 'l': /* Member limit */
 642                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 643                                 goto chan_exit;
 644                         if (!set) {
 645                                 if (is_oper || is_machine || is_owner ||
 646                                     is_admin || is_op || is_halfop)
 647                                         x[0] = *mode_ptr;
 648                                 else
 649                                         connected = IRC_WriteStrClient(Origin,
 650                                                 ERR_CHANOPRIVSNEEDED_MSG,
 651                                                 Client_ID(Origin),
 652                                                 Channel_Name(Channel));
 653                                 break;
 654                         }
 655                         if (arg_arg > mode_arg) {
 656                                 if (is_oper || is_machine || is_owner ||
 657                                     is_admin || is_op || is_halfop) {
 658                                         l = atol(Req->argv[arg_arg]);
 659                                         if (l > 0 && l < 0xFFFF) {
 660                                                 Channel_ModeDel(Channel, 'l');
 661                                                 Channel_SetMaxUsers(Channel, l);
 662                                                 snprintf(argadd, sizeof(argadd),
 663                                                          "%ld", l);
 664                                                 x[0] = *mode_ptr;
 665                                         }
 666                                 } else {
 667                                         connected = IRC_WriteStrClient(Origin,
 668                                                 ERR_CHANOPRIVSNEEDED_MSG,
 669                                                 Client_ID(Origin),
 670                                                 Channel_Name(Channel));
 671                                 }
 672                                 Req->argv[arg_arg][0] = '\0';
 673                                 arg_arg++;
 674                         } else {
 675 #ifdef STRICT_RFC
 676                                 /* Only send error message in "strict" mode,
 677                                  * this is how ircd2.11 and others behave ... */
 678                                 connected = IRC_WriteStrClient(Origin,
 679                                         ERR_NEEDMOREPARAMS_MSG,
 680                                         Client_ID(Origin), Req->command);
 681 #endif
 682                                 goto chan_exit;
 683                         }
 684                         break;
 685                 case 'O': /* IRC operators only */
 686                         if (set) {
 687                                 /* Only IRC operators are allowed to
 688                                  * set the 'O' channel mode! */
 689                                 if(is_oper || is_machine)
 690                                         x[0] = 'O';
 691                                 else
 692                                         connected = IRC_WriteStrClient(Origin,
 693                                                 ERR_NOPRIVILEGES_MSG,
 694                                                 Client_ID(Origin));
 695                         } else if(is_oper || is_machine || is_owner ||
 696                                   is_admin || is_op)
 697                                 x[0] = 'O';
 698                         else
 699                                 connected = IRC_WriteStrClient(Origin,
 700                                         ERR_CHANOPRIVSNEEDED_MSG,
 701                                         Client_ID(Origin),
 702                                         Channel_Name(Channel));
 703                         break;
 704                 case 'P': /* Persistent channel */
 705                         if (set) {
 706                                 /* Only IRC operators are allowed to
 707                                  * set the 'P' channel mode! */
 708                                 if(is_oper || is_machine)
 709                                         x[0] = 'P';
 710                                 else
 711                                         connected = IRC_WriteStrClient(Origin,
 712                                                 ERR_NOPRIVILEGES_MSG,
 713                                                 Client_ID(Origin));
 714                         } else if(is_oper || is_machine || is_owner ||
 715                                   is_admin || is_op)
 716                                 x[0] = 'P';
 717                         else
 718                                 connected = IRC_WriteStrClient(Origin,
 719                                         ERR_CHANOPRIVSNEEDED_MSG,
 720                                         Client_ID(Origin),
 721                                         Channel_Name(Channel));
 722                         break;
 723                 /* --- Channel user modes --- */
 724                 case 'q': /* Owner */
 725                 case 'a': /* Channel admin */
 726                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 727                                 connected = IRC_WriteStrClient(Origin,
 728                                         ERR_CHANOPPRIVTOOLOW_MSG,
 729                                         Client_ID(Origin),
 730                                         Channel_Name(Channel));
 731                                 goto chan_exit;
 732                         }
 733                 case 'o': /* Channel operator */
 734                         if(!is_oper && !is_machine && !is_owner &&
 735                            !is_admin && !is_op) {
 736                                 connected = IRC_WriteStrClient(Origin,
 737                                         ERR_CHANOPRIVSNEEDED_MSG,
 738                                         Client_ID(Origin),
 739                                         Channel_Name(Channel));
 740                                 goto chan_exit;
 741                         }
 742                 case 'h': /* Half Op */
 743                         if(!is_oper && !is_machine && !is_owner &&
 744                            !is_admin && !is_op) {
 745                                 connected = IRC_WriteStrClient(Origin,
 746                                         ERR_CHANOPRIVSNEEDED_MSG,
 747                                         Client_ID(Origin),
 748                                         Channel_Name(Channel));
 749                                 goto chan_exit;
 750                         }
 751                 case 'v': /* Voice */
 752                         if (arg_arg > mode_arg) {
 753                                 if (is_oper || is_machine || is_owner ||
 754                                     is_admin || is_op || is_halfop) {
 755                                         client = Client_Search(Req->argv[arg_arg]);
 756                                         if (client)
 757                                                 x[0] = *mode_ptr;
 758                                         else
 759                                                 connected = IRC_WriteStrClient(Origin,
 760                                                         ERR_NOSUCHNICK_MSG,
 761                                                         Client_ID(Origin),
 762                                                         Req->argv[arg_arg]);
 763                                 } else {
 764                                         connected = IRC_WriteStrClient(Origin,
 765                                                 ERR_CHANOPRIVSNEEDED_MSG,
 766                                                 Client_ID(Origin),
 767                                                 Channel_Name(Channel));
 768                                 }
 769                                 Req->argv[arg_arg][0] = '\0';
 770                                 arg_arg++;
 771                         } else {
 772 #ifdef STRICT_RFC
 773                                 /* Report an error to the client, when a user
 774                                  * mode should be changed but no nickname is
 775                                  * given. But don't do it when not in "strict"
 776                                  * mode, because most other servers don't do
 777                                  * it as well and some clients send "wired"
 778                                  * MODE commands like "MODE #chan -ooo nick". */
 779                                 connected = IRC_WriteStrClient(Origin,
 780                                         ERR_NEEDMOREPARAMS_MSG,
 781                                         Client_ID(Origin), Req->command);
 782 #endif
 783                                 goto chan_exit;
 784                         }
 785                         break;
 786                 /* --- Channel lists --- */
 787                 case 'I': /* Invite lists */
 788                 case 'b': /* Ban lists */
 789                 case 'e': /* Channel exception lists */
 790                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 791                                 goto chan_exit;
 792                         if (arg_arg > mode_arg) {
 793                                 /* modify list */
 794                                 if (is_oper || is_machine || is_owner ||
 795                                     is_admin || is_op || is_halfop) {
 796                                         connected = set
 797                                            ? Add_To_List(*mode_ptr, Origin,
 798                                                 Client, Channel,
 799                                                 Req->argv[arg_arg])
 800                                            : Del_From_List(*mode_ptr, Origin,
 801                                                 Client, Channel,
 802                                                 Req->argv[arg_arg]);
 803                                 } else {
 804                                         connected = IRC_WriteStrClient(Origin,
 805                                                 ERR_CHANOPRIVSNEEDED_MSG,
 806                                                 Client_ID(Origin),
 807                                                 Channel_Name(Channel));
 808                                 }
 809                                 Req->argv[arg_arg][0] = '\0';
 810                                 arg_arg++;
 811                         } else {
 812                                 switch (*mode_ptr) {
 813                                 case 'I':
 814                                         Channel_ShowInvites(Origin, Channel);
 815                                         break;
 816                                 case 'b':
 817                                         Channel_ShowBans(Origin, Channel);
 818                                         break;
 819                                 case 'e':
 820                                         Channel_ShowExcepts(Origin, Channel);
 821                                         break;
 822                                 }
 823                         }
 824                         break;
 825                 default:
 826                         if (Client_Type(Client) != CLIENT_SERVER) {
 827                                 Log(LOG_DEBUG,
 828                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 829                                     set ? '+' : '-', *mode_ptr,
 830                                     Client_ID(Origin), Channel_Name(Channel));
 831                                 connected = IRC_WriteStrClient(Origin,
 832                                         ERR_UNKNOWNMODE_MSG,
 833                                         Client_ID(Origin), *mode_ptr,
 834                                         Channel_Name(Channel));
 835                                 x[0] = '\0';
 836                         } else {
 837                                 Log(LOG_DEBUG,
 838                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 839                                     set ? '+' : '-', *mode_ptr,
 840                                     Client_ID(Origin), Channel_Name(Channel));
 841                                 x[0] = *mode_ptr;
 842                         }
 843                 }
 844
 845                 if (!connected)
 846                         break;
 847
 848                 /* Is there a valid mode change? */
 849                 if (!x[0])
 850                         continue;
 851
 852                 /* Validate target client */
 853                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 854                         if (!IRC_WriteStrClient
 855                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 856                              Client_ID(Origin), Client_ID(client),
 857                              Channel_Name(Channel)))
 858                                 break;
 859
 860                         continue;
 861                 }
 862
 863                 if (client) {
 864                         /* Channel-User-Mode */
 865                         retval = set
 866                                ? Channel_UserModeAdd(Channel, client, x[0])
 867                                : Channel_UserModeDel(Channel, client, x[0]);
 868                         if (retval) {
 869                                 strlcat(the_args, " ", sizeof(the_args));
 870                                 strlcat(the_args, Client_ID(client),
 871                                         sizeof(the_args));
 872                                 strlcat(the_modes, x, sizeof(the_modes));
 873                                 LogDebug
 874                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 875                                      Client_Mask(client), Channel_Name(Channel),
 876                                      Channel_UserModes(Channel, client));
 877                         }
 878                 } else {
 879                         /* Channel-Mode */
 880                         retval = set
 881                                ? Channel_ModeAdd(Channel, x[0])
 882                                : Channel_ModeDel(Channel, x[0]);
 883                         if (retval) {
 884                                 strlcat(the_modes, x, sizeof(the_modes));
 885                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 886                                          Channel_Name(Channel),
 887                                          Channel_Modes(Channel));
 888                         }
 889                 }
 890
 891                 /* Are there additional arguments to add? */
 892                 if (argadd[0]) {
 893                         strlcat(the_args, " ", sizeof(the_args));
 894                         strlcat(the_args, argadd, sizeof(the_args));
 895                 }
 896         }
 897
 898       chan_exit:
 899         /* Are there changed modes? */
 900         if (the_modes[1]) {
 901                 /* Clean up mode string */
 902                 len = strlen(the_modes) - 1;
 903                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 904                         the_modes[len] = '\0';
 905
 906                 if (Client_Type(Client) == CLIENT_SERVER) {
 907                         /* MODE requests for local channels from other servers
 908                          * are definitely invalid! */
 909                         if (Channel_IsLocal(Channel)) {
 910                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 911                                 return CONNECTED;
 912                         }
 913
 914                         /* Forward mode changes to channel users and all the
 915                          * other remote servers: */
 916                         IRC_WriteStrServersPrefix(Client, Origin,
 917                                 "MODE %s %s%s", Channel_Name(Channel),
 918                                 the_modes, the_args);
 919                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 920                                 false, "MODE %s %s%s", Channel_Name(Channel),
 921                                 the_modes, the_args);
 922                 } else {
 923                         if (use_servermode)
 924                                 Origin = Client_ThisServer();
 925                         /* Send reply to client and inform other servers and channel users */
 926                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 927                                         "MODE %s %s%s", Channel_Name(Channel),
 928                                         the_modes, the_args);
 929                         /* Only forward requests for non-local channels */
 930                         if (!Channel_IsLocal(Channel))
 931                                 IRC_WriteStrServersPrefix(Client, Origin,
 932                                         "MODE %s %s%s", Channel_Name(Channel),
 933                                         the_modes, the_args);
 934                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 935                                 false, "MODE %s %s%s", Channel_Name(Channel),
 936                                 the_modes, the_args);
 937                 }
 938         }
 939
 940         IRC_SetPenalty(Client, 1);
 941         return connected;
 942 } /* Channel_Mode */
 943
 944
 945 GLOBAL bool
 946 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 947 {
 948         assert( Client != NULL );
 949         assert( Req != NULL );
 950
 951         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 952
 953         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 954         {
 955                 Client_SetAway( Client, Req->argv[0] );
 956                 Client_ModeAdd( Client, 'a' );
 957                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 958                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 959         }
 960         else
 961         {
 962                 Client_ModeDel( Client, 'a' );
 963                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 964                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 965         }
 966 } /* IRC_AWAY */
 967
 968
 969 /**
 970  * Add entries to channel invite, ban and exception lists.
 971  *
 972  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 973  * @param Prefix The originator of the command.
 974  * @param Client The sender of the command.
 975  * @param Channel The channel of which the list should be modified.
 976  * @param Pattern The pattern to add to the list.
 977  * @return CONNECTED or DISCONNECTED.
 978  */
 979 static bool
 980 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 981             const char *Pattern)
 982 {
 983         char mask[MASK_LEN];
 984         struct list_head *list = NULL;
 985         long int current_count;
 986
 987         assert(Client != NULL);
 988         assert(Channel != NULL);
 989         assert(Pattern != NULL);
 990         assert(what == 'I' || what == 'b' || what == 'e');
 991
 992         Lists_MakeMask(Pattern, mask, sizeof(mask));
 993         current_count = Lists_Count(Channel_GetListInvites(Channel))
 994                         + Lists_Count(Channel_GetListExcepts(Channel))
 995                         + Lists_Count(Channel_GetListBans(Channel));
 996
 997         switch(what) {
 998                 case 'I':
 999                         list = Channel_GetListInvites(Channel);
1000                         break;
1001                 case 'b':
1002                         list = Channel_GetListBans(Channel);
1003                         break;
1004                 case 'e':
1005                         list = Channel_GetListExcepts(Channel);
1006                         break;
1007         }
1008
1009         if (Lists_CheckDupeMask(list, mask))
1010                 return CONNECTED;
1011         if (Client_Type(Client) == CLIENT_USER &&
1012             current_count >= MAX_HNDL_CHANNEL_LISTS)
1013                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
1014                                           Client_ID(Client),
1015                                           Channel_Name(Channel), mask,
1016                                           MAX_HNDL_CHANNEL_LISTS);
1017
1018         switch (what) {
1019                 case 'I':
1020                         if (!Channel_AddInvite(Channel, mask, false))
1021                                 return CONNECTED;
1022                         break;
1023                 case 'b':
1024                         if (!Channel_AddBan(Channel, mask))
1025                                 return CONNECTED;
1026                         break;
1027                 case 'e':
1028                         if (!Channel_AddExcept(Channel, mask))
1029                                 return CONNECTED;
1030                         break;
1031         }
1032         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1033 }
1034
1035
1036 /**
1037  * Delete entries from channel invite, ban and exeption lists.
1038  *
1039  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1040  * @param Prefix The originator of the command.
1041  * @param Client The sender of the command.
1042  * @param Channel The channel of which the list should be modified.
1043  * @param Pattern The pattern to add to the list.
1044  * @return CONNECTED or DISCONNECTED.
1045  */
1046 static bool
1047 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1048               const char *Pattern)
1049 {
1050         char mask[MASK_LEN];
1051         struct list_head *list = NULL;
1052
1053         assert(Client != NULL);
1054         assert(Channel != NULL);
1055         assert(Pattern != NULL);
1056         assert(what == 'I' || what == 'b' || what == 'e');
1057
1058         Lists_MakeMask(Pattern, mask, sizeof(mask));
1059
1060         switch (what) {
1061                 case 'I':
1062                         list = Channel_GetListInvites(Channel);
1063                         break;
1064                 case 'b':
1065                         list = Channel_GetListBans(Channel);
1066                         break;
1067                 case 'e':
1068                         list = Channel_GetListExcepts(Channel);
1069                         break;
1070         }
1071
1072         if (!Lists_CheckDupeMask(list, mask))
1073                 return CONNECTED;
1074         Lists_Del(list, mask);
1075
1076         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1077 }
1078
1079
1080 /**
1081  * Send information about changed channel invite/ban/exception lists to clients.
1082  *
1083  * @param IsAdd true if the list item has been added, false otherwise.
1084  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1085  * @param Prefix The originator of the mode list change.
1086  * @param Client The sender of the command.
1087  * @param Channel The channel of which the list has been modified.
1088  * @param Mask The mask which has been added or removed.
1089  * @return CONNECTED or DISCONNECTED.
1090  */
1091 static bool
1092 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1093                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1094 {
1095         bool ok = true;
1096
1097         /* Send confirmation to the client */
1098         if (Client_Type(Client) == CLIENT_USER)
1099                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1100                                               Channel_Name(Channel),
1101                                               IsAdd ? '+' : '-',
1102                                               ModeChar, Mask);
1103
1104         /* to other servers */
1105         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1106                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1107                                   ModeChar, Mask);
1108
1109         /* and local users in channel */
1110         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1111                                   "MODE %s %c%c %s", Channel_Name(Channel),
1112                                   IsAdd ? '+' : '-', ModeChar, Mask );
1113
1114         return ok;
1115 } /* Send_ListChange */
1116
1117
1118 /* -eof- */