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