src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-write.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "parse.h"
  32 #include "messages.h"
  33 #include "conf.h"
  34
  35 #include "exp.h"
  36 #include "irc-mode.h"
  37
  38
  39 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  40                                 CLIENT *Target));
  41 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42                                  CHANNEL *Channel));
  43
  44 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  45                                 CHANNEL *Channel, const char *Pattern));
  46 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  47                                   CHANNEL *Channel, const char *Pattern));
  48
  49 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  50                                     CLIENT *Prefix, CLIENT *Client,
  51                                     CHANNEL *Channel, const char *Mask));
  52
  53
  54 /**
  55  * Handler for the IRC "MODE" command.
  56  *
  57  * See RFC 2812 section 3.1.5 ("user mode message") and section 3.2.3
  58  * ("channel mode message"), and RFC 2811 section 4 ("channel modes").
  59  *
  60  * @param Client        The client from which this command has been received.
  61  * @param Req           Request structure with prefix and all parameters.
  62  * @returns             CONNECTED or DISCONNECTED.
  63  */
  64 GLOBAL bool
  65 IRC_MODE( CLIENT *Client, REQUEST *Req )
  66 {
  67         CLIENT *cl, *origin;
  68         CHANNEL *chan;
  69
  70         assert(Client != NULL);
  71         assert(Req != NULL);
  72
  73         /* No parameters? */
  74         if (Req->argc < 1)
  75                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  76                                           Client_ID(Client), Req->command);
  77
  78         /* Origin for answers */
  79         if (Client_Type(Client) == CLIENT_SERVER) {
  80                 origin = Client_Search(Req->prefix);
  81                 if (!origin)
  82                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  83                                                   Client_ID(Client),
  84                                                   Req->prefix);
  85         } else
  86                 origin = Client;
  87
  88         /* Channel or user mode? */
  89         cl = NULL; chan = NULL;
  90         if (Client_IsValidNick(Req->argv[0]))
  91                 cl = Client_Search(Req->argv[0]);
  92         if (Channel_IsValidName(Req->argv[0]))
  93                 chan = Channel_Search(Req->argv[0]);
  94
  95         if (cl)
  96                 return Client_Mode(Client, Req, origin, cl);
  97         if (chan)
  98                 return Channel_Mode(Client, Req, origin, chan);
  99
 100         /* No target found! */
 101         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 102                         Client_ID(Client), Req->argv[0]);
 103 } /* IRC_MODE */
 104
 105
 106 /**
 107  * Check if the "mode limit" for a client has been reached.
 108  *
 109  * This limit doesn't apply for servers or services!
 110  *
 111  * @param Client The client to check.
 112  * @param Count The number of modes already handled.
 113  * @return true if the limit has been reached.
 114  */
 115 static bool
 116 Mode_Limit_Reached(CLIENT *Client, int Count)
 117 {
 118         if (Client_Type(Client) == CLIENT_SERVER
 119             || Client_Type(Client) == CLIENT_SERVICE)
 120                 return false;
 121         if (Count < MAX_HNDL_MODES_ARG)
 122                 return false;
 123         return true;
 124 }
 125
 126
 127 /**
 128  * Handle client mode requests
 129  *
 130  * @param Client        The client from which this command has been received.
 131  * @param Req           Request structure with prefix and all parameters.
 132  * @param Origin        The originator of the MODE command (prefix).
 133  * @param Target        The target (client) of this MODE command.
 134  * @returns             CONNECTED or DISCONNECTED.
 135  */
 136 static bool
 137 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 138 {
 139         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 140         bool ok, set;
 141         bool send_RPL_HOSTHIDDEN_MSG = false;
 142         int mode_arg;
 143         size_t len;
 144
 145         /* Is the client allowed to request or change the modes? */
 146         if (Client_Type(Client) == CLIENT_USER) {
 147                 /* Users are only allowed to manipulate their own modes! */
 148                 if (Target != Client)
 149                         return IRC_WriteStrClient(Client,
 150                                                   ERR_USERSDONTMATCH_MSG,
 151                                                   Client_ID(Client));
 152         }
 153
 154         /* Mode request: let's answer it :-) */
 155         if (Req->argc == 1)
 156                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 157                                           Client_ID(Origin),
 158                                           Client_Modes(Target));
 159
 160         mode_arg = 1;
 161         mode_ptr = Req->argv[mode_arg];
 162
 163         /* Initial state: set or unset modes? */
 164         if (*mode_ptr == '+') {
 165                 set = true;
 166                 strcpy(the_modes, "+");
 167         } else if (*mode_ptr == '-') {
 168                 set = false;
 169                 strcpy(the_modes, "-");
 170         } else
 171                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 172                                           Client_ID(Origin));
 173
 174         x[1] = '\0';
 175         ok = CONNECTED;
 176         while (mode_ptr) {
 177                 mode_ptr++;
 178                 if (!*mode_ptr) {
 179                         /* Try next argument if there's any */
 180                         mode_arg++;
 181                         if (mode_arg < Req->argc)
 182                                 mode_ptr = Req->argv[mode_arg];
 183                         else
 184                                 break;
 185                 }
 186
 187                 switch(*mode_ptr) {
 188                   case '+':
 189                   case '-':
 190                         if ((*mode_ptr == '+' && !set)
 191                             || (*mode_ptr == '-' && set)) {
 192                                 /* Action modifier ("+"/"-") must be changed */
 193                                 len = strlen(the_modes) - 1;
 194                                 if (the_modes[len] == '+'
 195                                     || the_modes[len] == '-') {
 196                                         /* Last character in the "result
 197                                          * string" was an "action", so just
 198                                          * overwrite it with the new action */
 199                                         the_modes[len] = *mode_ptr;
 200                                 } else {
 201                                         /* Append new modifier character to
 202                                          * the resulting mode string */
 203                                         x[0] = *mode_ptr;
 204                                         strlcat(the_modes, x,
 205                                                 sizeof(the_modes));
 206                                 }
 207                                 if (*mode_ptr == '+')
 208                                         set = true;
 209                                 else
 210                                         set = false;
 211                         }
 212                         continue;
 213                 }
 214
 215                 /* Validate modes */
 216                 x[0] = '\0';
 217                 switch (*mode_ptr) {
 218                 case 'C': /* Only messages from clients sharing a channel */
 219                 case 'i': /* Invisible */
 220                 case 's': /* Server messages */
 221                 case 'w': /* Wallops messages */
 222                         x[0] = *mode_ptr;
 223                         break;
 224                 case 'a': /* Away */
 225                         if (Client_Type(Client) == CLIENT_SERVER) {
 226                                 x[0] = 'a';
 227                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 228                         } else
 229                                 ok = IRC_WriteStrClient(Origin,
 230                                                         ERR_NOPRIVILEGES_MSG,
 231                                                         Client_ID(Origin));
 232                         break;
 233                 case 'B': /* Bot */
 234                         if (Client_HasMode(Client, 'r'))
 235                                 ok = IRC_WriteStrClient(Origin,
 236                                                         ERR_RESTRICTED_MSG,
 237                                                         Client_ID(Origin));
 238                         else
 239                                 x[0] = 'B';
 240                         break;
 241                 case 'c': /* Receive connect notices
 242                            * (only settable by IRC operators!) */
 243                         if (!set || Client_Type(Client) == CLIENT_SERVER
 244                             || Client_OperByMe(Origin))
 245                                 x[0] = 'c';
 246                         else
 247                                 ok = IRC_WriteStrClient(Origin,
 248                                                         ERR_NOPRIVILEGES_MSG,
 249                                                         Client_ID(Origin));
 250                         break;
 251                 case 'o': /* IRC operator (only unsettable!) */
 252                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 253                                 Client_SetOperByMe(Target, false);
 254                                 x[0] = 'o';
 255                         } else
 256                                 ok = IRC_WriteStrClient(Origin,
 257                                                         ERR_NOPRIVILEGES_MSG,
 258                                                         Client_ID(Origin));
 259                         break;
 260                 case 'r': /* Restricted (only settable) */
 261                         if (set || Client_Type(Client) == CLIENT_SERVER)
 262                                 x[0] = 'r';
 263                         else
 264                                 ok = IRC_WriteStrClient(Origin,
 265                                                         ERR_RESTRICTED_MSG,
 266                                                         Client_ID(Origin));
 267                         break;
 268                 case 'R': /* Registered (not [un]settable by clients) */
 269                         if (Client_Type(Client) == CLIENT_SERVER)
 270                                 x[0] = 'R';
 271                         else
 272                                 ok = IRC_WriteStrClient(Origin,
 273                                                         ERR_NICKREGISTER_MSG,
 274                                                         Client_ID(Origin));
 275                         break;
 276                 case 'x': /* Cloak hostname */
 277                         if (Client_HasMode(Client, 'r'))
 278                                 ok = IRC_WriteStrClient(Origin,
 279                                                         ERR_RESTRICTED_MSG,
 280                                                         Client_ID(Origin));
 281                         else
 282                                 x[0] = 'x';
 283                                 send_RPL_HOSTHIDDEN_MSG = true;
 284                         break;
 285                 default:
 286                         if (Client_Type(Client) != CLIENT_SERVER) {
 287                                 Log(LOG_DEBUG,
 288                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 289                                     set ? '+' : '-', *mode_ptr,
 290                                     Client_ID(Origin));
 291                                 ok = IRC_WriteStrClient(Origin,
 292                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 293                                                         Client_ID(Origin),
 294                                                         set ? '+' : '-',
 295                                                         *mode_ptr);
 296                                 x[0] = '\0';
 297                         } else {
 298                                 Log(LOG_DEBUG,
 299                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 300                                     set ? '+' : '-', *mode_ptr,
 301                                     Client_ID(Origin), Client_ID(Target));
 302                                 x[0] = *mode_ptr;
 303                         }
 304                 }
 305
 306                 if (!ok)
 307                         break;
 308
 309                 /* Is there a valid mode change? */
 310                 if (!x[0])
 311                         continue;
 312
 313                 if (set) {
 314                         if (Client_ModeAdd(Target, x[0]))
 315                                 strlcat(the_modes, x, sizeof(the_modes));
 316                 } else {
 317                         if (Client_ModeDel(Target, x[0]))
 318                                 strlcat(the_modes, x, sizeof(the_modes));
 319                 }
 320         }
 321
 322         /* Are there changed modes? */
 323         if (the_modes[1]) {
 324                 /* Remove needless action modifier characters */
 325                 len = strlen(the_modes) - 1;
 326                 if (the_modes[len] == '+' || the_modes[len] == '-')
 327                         the_modes[len] = '\0';
 328
 329                 if (Client_Type(Client) == CLIENT_SERVER) {
 330                         /* Forward modes to other servers */
 331                         if (Client_Conn(Target) != NONE) {
 332                                 /* Remote server (service?) changed modes
 333                                  * for one of our clients. Inform it! */
 334                                 IRC_WriteStrClientPrefix(Target, Origin,
 335                                                          "MODE %s :%s",
 336                                                          Client_ID(Target),
 337                                                          the_modes);
 338                         }
 339                         IRC_WriteStrServersPrefix(Client, Origin,
 340                                                   "MODE %s :%s",
 341                                                   Client_ID(Target),
 342                                                   the_modes);
 343                 } else {
 344                         /* Send reply to client and inform other servers */
 345                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 346                                                       "MODE %s :%s",
 347                                                       Client_ID(Target),
 348                                                       the_modes);
 349                         IRC_WriteStrServersPrefix(Client, Origin,
 350                                                   "MODE %s :%s",
 351                                                   Client_ID(Target),
 352                                                   the_modes);
 353                         if (send_RPL_HOSTHIDDEN_MSG)
 354                                 IRC_WriteStrClient(Client, RPL_HOSTHIDDEN_MSG,
 355                                                    Client_ID(Client),
 356                                                    Client_HostnameCloaked(Client));
 357                 }
 358                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 359                          Client_TypeText(Target), Client_Mask(Target),
 360                          Client_Modes(Target));
 361         }
 362
 363         IRC_SetPenalty(Client, 1);
 364         return ok;
 365 } /* Client_Mode */
 366
 367
 368 static bool
 369 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 370 {
 371         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 372         const char *mode_ptr;
 373
 374         /* Member or not? -- That's the question! */
 375         if (!Channel_IsMemberOf(Channel, Origin))
 376                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 377                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 378
 379         /* The sender is a member: generate extended reply */
 380         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 381         mode_ptr = the_modes;
 382         the_args[0] = '\0';
 383
 384         while(*mode_ptr) {
 385                 switch(*mode_ptr) {
 386                 case 'l':
 387                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 388                         strlcat(the_args, argadd, sizeof(the_args));
 389                         break;
 390                 case 'k':
 391                         strlcat(the_args, " ", sizeof(the_args));
 392                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 393                         break;
 394                 }
 395                 mode_ptr++;
 396         }
 397         if (the_args[0])
 398                 strlcat(the_modes, the_args, sizeof(the_modes));
 399
 400         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 401                                 Client_ID(Origin), Channel_Name(Channel),
 402                                 the_modes))
 403                 return DISCONNECTED;
 404 #ifndef STRICT_RFC
 405         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 406                                   Client_ID(Origin), Channel_Name(Channel),
 407                                   Channel_CreationTime(Channel)))
 408                 return DISCONNECTED;
 409 #endif
 410         return CONNECTED;
 411 }
 412
 413
 414 /**
 415  * Handle channel mode and channel-user mode changes
 416  */
 417 static bool
 418 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 419 {
 420         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 421             argadd[CLIENT_PASS_LEN], *mode_ptr;
 422         bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
 423         int mode_arg, arg_arg, mode_arg_count = 0;
 424         CLIENT *client;
 425         long l;
 426         size_t len;
 427
 428         if (Channel_IsModeless(Channel))
 429                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 430                                 Client_ID(Client), Channel_Name(Channel));
 431
 432         /* Mode request: let's answer it :-) */
 433         if (Req->argc <= 1)
 434                 return Channel_Mode_Answer_Request(Origin, Channel);
 435
 436         Channel_CheckAdminRights(Channel, Client, Origin,
 437                                  &onchannel, &modeok, &use_servermode);
 438
 439         if (!onchannel && !modeok)
 440                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 441                                           Client_ID(Origin),
 442                                           Channel_Name(Channel));
 443
 444         mode_arg = 1;
 445         mode_ptr = Req->argv[mode_arg];
 446         if (Req->argc > mode_arg + 1)
 447                 arg_arg = mode_arg + 1;
 448         else
 449                 arg_arg = -1;
 450
 451         /* Initial state: set or unset modes? */
 452         skiponce = false;
 453         switch (*mode_ptr) {
 454         case '-':
 455                 set = false;
 456                 break;
 457         case '+':
 458                 set = true;
 459                 break;
 460         default:
 461                 set = true;
 462                 skiponce = true;
 463         }
 464
 465         /* Prepare reply string */
 466         strcpy(the_modes, set ? "+" : "-");
 467         the_args[0] = '\0';
 468
 469         x[1] = '\0';
 470         connected = CONNECTED;
 471         while (mode_ptr) {
 472                 if (!skiponce)
 473                         mode_ptr++;
 474                 if (!*mode_ptr) {
 475                         /* Try next argument if there's any */
 476                         if (arg_arg < 0)
 477                                 break;
 478                         if (arg_arg > mode_arg)
 479                                 mode_arg = arg_arg;
 480                         else
 481                                 mode_arg++;
 482
 483                         if (mode_arg >= Req->argc)
 484                                 break;
 485                         mode_ptr = Req->argv[mode_arg];
 486
 487                         if (Req->argc > mode_arg + 1)
 488                                 arg_arg = mode_arg + 1;
 489                         else
 490                                 arg_arg = -1;
 491                 }
 492                 skiponce = false;
 493
 494                 switch (*mode_ptr) {
 495                 case '+':
 496                 case '-':
 497                         if (((*mode_ptr == '+') && !set)
 498                             || ((*mode_ptr == '-') && set)) {
 499                                 /* Action modifier ("+"/"-") must be changed ... */
 500                                 len = strlen(the_modes) - 1;
 501                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 502                                         /* Adjust last action modifier in result */
 503                                         the_modes[len] = *mode_ptr;
 504                                 } else {
 505                                         /* Append modifier character to result string */
 506                                         x[0] = *mode_ptr;
 507                                         strlcat(the_modes, x, sizeof(the_modes));
 508                                 }
 509                                 set = *mode_ptr == '+';
 510                         }
 511                         continue;
 512                 }
 513
 514                 /* Are there arguments left? */
 515                 if (arg_arg >= Req->argc)
 516                         arg_arg = -1;
 517
 518                 /* Validate modes */
 519                 x[0] = '\0';
 520                 argadd[0] = '\0';
 521                 client = NULL;
 522                 switch (*mode_ptr) {
 523                 /* --- Channel modes --- */
 524                 case 'i': /* Invite only */
 525                 case 'M': /* Only identified nicks can write */
 526                 case 'm': /* Moderated */
 527                 case 'n': /* Only members can write */
 528                 case 'R': /* Registered users only */
 529                 case 's': /* Secret channel */
 530                 case 't': /* Topic locked */
 531                 case 'z': /* Secure connections only */
 532                         if (modeok)
 533                                 x[0] = *mode_ptr;
 534                         else
 535                                 connected = IRC_WriteStrClient(Origin,
 536                                         ERR_CHANOPRIVSNEEDED_MSG,
 537                                         Client_ID(Origin), Channel_Name(Channel));
 538                         break;
 539                 case 'k': /* Channel key */
 540                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 541                                 goto chan_exit;
 542                         if (!set) {
 543                                 if (modeok)
 544                                         x[0] = *mode_ptr;
 545                                 else
 546                                         connected = IRC_WriteStrClient(Origin,
 547                                                 ERR_CHANOPRIVSNEEDED_MSG,
 548                                                 Client_ID(Origin),
 549                                                 Channel_Name(Channel));
 550                                 break;
 551                         }
 552                         if (arg_arg > mode_arg) {
 553                                 if (modeok) {
 554                                         Channel_ModeDel(Channel, 'k');
 555                                         Channel_SetKey(Channel,
 556                                                        Req->argv[arg_arg]);
 557                                         strlcpy(argadd, Channel_Key(Channel),
 558                                                 sizeof(argadd));
 559                                         x[0] = *mode_ptr;
 560                                 } else {
 561                                         connected = IRC_WriteStrClient(Origin,
 562                                                 ERR_CHANOPRIVSNEEDED_MSG,
 563                                                 Client_ID(Origin),
 564                                                 Channel_Name(Channel));
 565                                 }
 566                                 Req->argv[arg_arg][0] = '\0';
 567                                 arg_arg++;
 568                         } else {
 569                                 connected = IRC_WriteStrClient(Origin,
 570                                         ERR_NEEDMOREPARAMS_MSG,
 571                                         Client_ID(Origin), Req->command);
 572                                 goto chan_exit;
 573                         }
 574                         break;
 575                 case 'l': /* Member limit */
 576                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 577                                 goto chan_exit;
 578                         if (!set) {
 579                                 if (modeok)
 580                                         x[0] = *mode_ptr;
 581                                 else
 582                                         connected = IRC_WriteStrClient(Origin,
 583                                                 ERR_CHANOPRIVSNEEDED_MSG,
 584                                                 Client_ID(Origin),
 585                                                 Channel_Name(Channel));
 586                                 break;
 587                         }
 588                         if (arg_arg > mode_arg) {
 589                                 if (modeok) {
 590                                         l = atol(Req->argv[arg_arg]);
 591                                         if (l > 0 && l < 0xFFFF) {
 592                                                 Channel_ModeDel(Channel, 'l');
 593                                                 Channel_SetMaxUsers(Channel, l);
 594                                                 snprintf(argadd, sizeof(argadd),
 595                                                          "%ld", l);
 596                                                 x[0] = *mode_ptr;
 597                                         }
 598                                 } else {
 599                                         connected = IRC_WriteStrClient(Origin,
 600                                                 ERR_CHANOPRIVSNEEDED_MSG,
 601                                                 Client_ID(Origin),
 602                                                 Channel_Name(Channel));
 603                                 }
 604                                 Req->argv[arg_arg][0] = '\0';
 605                                 arg_arg++;
 606                         } else {
 607                                 connected = IRC_WriteStrClient(Origin,
 608                                         ERR_NEEDMOREPARAMS_MSG,
 609                                         Client_ID(Origin), Req->command);
 610                                 goto chan_exit;
 611                         }
 612                         break;
 613                 case 'O': /* IRC operators only */
 614                         if (modeok) {
 615                                 /* Only IRC operators are allowed to
 616                                  * set the 'O' channel mode! */
 617                                 if (set && !(Client_OperByMe(Client)
 618                                     || Client_Type(Client) == CLIENT_SERVER))
 619                                         connected = IRC_WriteStrClient(Origin,
 620                                                 ERR_NOPRIVILEGES_MSG,
 621                                                 Client_ID(Origin));
 622                                 else
 623                                         x[0] = 'O';
 624                         } else
 625                                 connected = IRC_WriteStrClient(Origin,
 626                                                 ERR_CHANOPRIVSNEEDED_MSG,
 627                                                 Client_ID(Origin),
 628                                                 Channel_Name(Channel));
 629                                 break;
 630                 case 'P': /* Persistent channel */
 631                         if (modeok) {
 632                                 /* Only IRC operators are allowed to
 633                                  * set the 'P' channel mode! */
 634                                 if (set && !(Client_OperByMe(Client)
 635                                     || Client_Type(Client) == CLIENT_SERVER))
 636                                         connected = IRC_WriteStrClient(Origin,
 637                                                 ERR_NOPRIVILEGES_MSG,
 638                                                 Client_ID(Origin));
 639                                 else
 640                                         x[0] = 'P';
 641                         } else
 642                                 connected = IRC_WriteStrClient(Origin,
 643                                         ERR_CHANOPRIVSNEEDED_MSG,
 644                                         Client_ID(Origin),
 645                                         Channel_Name(Channel));
 646                         break;
 647                 /* --- Channel user modes --- */
 648                 case 'a':
 649                 case 'h':
 650                 case 'q':
 651                         if (Client_Type(Client) != CLIENT_SERVER) {
 652                                 connected = IRC_WriteStrClient(Origin,
 653                                         ERR_CHANOPRIVSNEEDED_MSG,
 654                                         Client_ID(Origin),
 655                                         Channel_Name(Channel));
 656                                 goto chan_exit;
 657                         }
 658                 case 'o': /* Channel operator */
 659                 case 'v': /* Voice */
 660                         if (arg_arg > mode_arg) {
 661                                 if (modeok) {
 662                                         client = Client_Search(Req->argv[arg_arg]);
 663                                         if (client)
 664                                                 x[0] = *mode_ptr;
 665                                         else
 666                                                 connected = IRC_WriteStrClient(Client,
 667                                                         ERR_NOSUCHNICK_MSG,
 668                                                         Client_ID(Client),
 669                                                         Req->argv[arg_arg]);
 670                                 } else {
 671                                         connected = IRC_WriteStrClient(Origin,
 672                                                 ERR_CHANOPRIVSNEEDED_MSG,
 673                                                 Client_ID(Origin),
 674                                                 Channel_Name(Channel));
 675                                 }
 676                                 Req->argv[arg_arg][0] = '\0';
 677                                 arg_arg++;
 678                         } else {
 679                                 connected = IRC_WriteStrClient(Origin,
 680                                         ERR_NEEDMOREPARAMS_MSG,
 681                                         Client_ID(Origin), Req->command);
 682                                 goto chan_exit;
 683                         }
 684                         break;
 685                 /* --- Channel lists --- */
 686                 case 'I': /* Invite lists */
 687                 case 'b': /* Ban lists */
 688                 case 'e': /* Channel exception lists */
 689                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 690                                 goto chan_exit;
 691                         if (arg_arg > mode_arg) {
 692                                 /* modify list */
 693                                 if (modeok) {
 694                                         connected = set
 695                                            ? Add_To_List(*mode_ptr, Origin,
 696                                                 Client, Channel,
 697                                                 Req->argv[arg_arg])
 698                                            : Del_From_List(*mode_ptr, Origin,
 699                                                 Client, Channel,
 700                                                 Req->argv[arg_arg]);
 701                                 } else {
 702                                         connected = IRC_WriteStrClient(Origin,
 703                                                 ERR_CHANOPRIVSNEEDED_MSG,
 704                                                 Client_ID(Origin),
 705                                                 Channel_Name(Channel));
 706                                 }
 707                                 Req->argv[arg_arg][0] = '\0';
 708                                 arg_arg++;
 709                         } else {
 710                                 switch (*mode_ptr) {
 711                                 case 'I':
 712                                         Channel_ShowInvites(Origin, Channel);
 713                                         break;
 714                                 case 'b':
 715                                         Channel_ShowBans(Origin, Channel);
 716                                         break;
 717                                 case 'e':
 718                                         Channel_ShowExcepts(Origin, Channel);
 719                                         break;
 720                                 }
 721                         }
 722                         break;
 723                 default:
 724                         if (Client_Type(Client) != CLIENT_SERVER) {
 725                                 Log(LOG_DEBUG,
 726                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 727                                     set ? '+' : '-', *mode_ptr,
 728                                     Client_ID(Origin), Channel_Name(Channel));
 729                                 connected = IRC_WriteStrClient(Origin,
 730                                         ERR_UNKNOWNMODE_MSG,
 731                                         Client_ID(Origin), *mode_ptr,
 732                                         Channel_Name(Channel));
 733                                 x[0] = '\0';
 734                         } else {
 735                                 Log(LOG_DEBUG,
 736                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 737                                     set ? '+' : '-', *mode_ptr,
 738                                     Client_ID(Origin), Channel_Name(Channel));
 739                                 x[0] = *mode_ptr;
 740                         }
 741                 }
 742
 743                 if (!connected)
 744                         break;
 745
 746                 /* Is there a valid mode change? */
 747                 if (!x[0])
 748                         continue;
 749
 750                 /* Validate target client */
 751                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 752                         if (!IRC_WriteStrClient
 753                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 754                              Client_ID(Origin), Client_ID(client),
 755                              Channel_Name(Channel)))
 756                                 break;
 757
 758                         continue;
 759                 }
 760
 761                 if (client) {
 762                         /* Channel-User-Mode */
 763                         retval = set
 764                                ? Channel_UserModeAdd(Channel, client, x[0])
 765                                : Channel_UserModeDel(Channel, client, x[0]);
 766                         if (retval) {
 767                                 strlcat(the_args, " ", sizeof(the_args));
 768                                 strlcat(the_args, Client_ID(client),
 769                                         sizeof(the_args));
 770                                 strlcat(the_modes, x, sizeof(the_modes));
 771                                 LogDebug
 772                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 773                                      Client_Mask(client), Channel_Name(Channel),
 774                                      Channel_UserModes(Channel, client));
 775                         }
 776                 } else {
 777                         /* Channel-Mode */
 778                         retval = set
 779                                ? Channel_ModeAdd(Channel, x[0])
 780                                : Channel_ModeDel(Channel, x[0]);
 781                         if (retval) {
 782                                 strlcat(the_modes, x, sizeof(the_modes));
 783                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 784                                          Channel_Name(Channel),
 785                                          Channel_Modes(Channel));
 786                         }
 787                 }
 788
 789                 /* Are there additional arguments to add? */
 790                 if (argadd[0]) {
 791                         strlcat(the_args, " ", sizeof(the_args));
 792                         strlcat(the_args, argadd, sizeof(the_args));
 793                 }
 794         }
 795
 796       chan_exit:
 797         /* Are there changed modes? */
 798         if (the_modes[1]) {
 799                 /* Clean up mode string */
 800                 len = strlen(the_modes) - 1;
 801                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 802                         the_modes[len] = '\0';
 803
 804                 if (Client_Type(Client) == CLIENT_SERVER) {
 805                         /* MODE requests for local channels from other servers
 806                          * are definitely invalid! */
 807                         if (Channel_IsLocal(Channel)) {
 808                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 809                                 return CONNECTED;
 810                         }
 811
 812                         /* Forward mode changes to channel users and all the
 813                          * other remote servers: */
 814                         IRC_WriteStrServersPrefix(Client, Origin,
 815                                 "MODE %s %s%s", Channel_Name(Channel),
 816                                 the_modes, the_args);
 817                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 818                                 false, "MODE %s %s%s", Channel_Name(Channel),
 819                                 the_modes, the_args);
 820                 } else {
 821                         if (use_servermode)
 822                                 Origin = Client_ThisServer();
 823                         /* Send reply to client and inform other servers and channel users */
 824                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 825                                         "MODE %s %s%s", Channel_Name(Channel),
 826                                         the_modes, the_args);
 827                         /* Only forward requests for non-local channels */
 828                         if (!Channel_IsLocal(Channel))
 829                                 IRC_WriteStrServersPrefix(Client, Origin,
 830                                         "MODE %s %s%s", Channel_Name(Channel),
 831                                         the_modes, the_args);
 832                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 833                                 false, "MODE %s %s%s", Channel_Name(Channel),
 834                                 the_modes, the_args);
 835                 }
 836         }
 837
 838         IRC_SetPenalty(Client, 1);
 839         return connected;
 840 } /* Channel_Mode */
 841
 842
 843 GLOBAL bool
 844 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 845 {
 846         assert( Client != NULL );
 847         assert( Req != NULL );
 848
 849         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 850
 851         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 852         {
 853                 Client_SetAway( Client, Req->argv[0] );
 854                 Client_ModeAdd( Client, 'a' );
 855                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 856                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 857         }
 858         else
 859         {
 860                 Client_ModeDel( Client, 'a' );
 861                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 862                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 863         }
 864 } /* IRC_AWAY */
 865
 866
 867 /**
 868  * Add entries to channel invite, ban and exception lists.
 869  *
 870  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 871  * @param Prefix The originator of the command.
 872  * @param Client The sender of the command.
 873  * @param Channel The channel of which the list should be modified.
 874  * @param Pattern The pattern to add to the list.
 875  * @return CONNECTED or DISCONNECTED.
 876  */
 877 static bool
 878 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 879             const char *Pattern)
 880 {
 881         const char *mask;
 882         struct list_head *list = NULL;
 883         long int current_count;
 884
 885         assert(Client != NULL);
 886         assert(Channel != NULL);
 887         assert(Pattern != NULL);
 888         assert(what == 'I' || what == 'b' || what == 'e');
 889
 890         mask = Lists_MakeMask(Pattern);
 891         current_count = Lists_Count(Channel_GetListInvites(Channel))
 892                         + Lists_Count(Channel_GetListExcepts(Channel))
 893                         + Lists_Count(Channel_GetListBans(Channel));
 894
 895         switch(what) {
 896                 case 'I':
 897                         list = Channel_GetListInvites(Channel);
 898                         break;
 899                 case 'b':
 900                         list = Channel_GetListBans(Channel);
 901                         break;
 902                 case 'e':
 903                         list = Channel_GetListExcepts(Channel);
 904                         break;
 905         }
 906
 907         if (Lists_CheckDupeMask(list, mask))
 908                 return CONNECTED;
 909         if (Client_Type(Client) == CLIENT_USER &&
 910             current_count >= MAX_HNDL_CHANNEL_LISTS)
 911                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
 912                                           Client_ID(Client),
 913                                           Channel_Name(Channel), mask,
 914                                           MAX_HNDL_CHANNEL_LISTS);
 915
 916         switch (what) {
 917                 case 'I':
 918                         if (!Channel_AddInvite(Channel, mask, false))
 919                                 return CONNECTED;
 920                         break;
 921                 case 'b':
 922                         if (!Channel_AddBan(Channel, mask))
 923                                 return CONNECTED;
 924                         break;
 925                 case 'e':
 926                         if (!Channel_AddExcept(Channel, mask))
 927                                 return CONNECTED;
 928                         break;
 929         }
 930         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
 931 }
 932
 933
 934 /**
 935  * Delete entries from channel invite, ban and exeption lists.
 936  *
 937  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 938  * @param Prefix The originator of the command.
 939  * @param Client The sender of the command.
 940  * @param Channel The channel of which the list should be modified.
 941  * @param Pattern The pattern to add to the list.
 942  * @return CONNECTED or DISCONNECTED.
 943  */
 944 static bool
 945 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 946               const char *Pattern)
 947 {
 948         const char *mask;
 949         struct list_head *list = NULL;
 950
 951         assert(Client != NULL);
 952         assert(Channel != NULL);
 953         assert(Pattern != NULL);
 954         assert(what == 'I' || what == 'b' || what == 'e');
 955
 956         mask = Lists_MakeMask(Pattern);
 957
 958         switch (what) {
 959                 case 'I':
 960                         list = Channel_GetListInvites(Channel);
 961                         break;
 962                 case 'b':
 963                         list = Channel_GetListBans(Channel);
 964                         break;
 965                 case 'e':
 966                         list = Channel_GetListExcepts(Channel);
 967                         break;
 968         }
 969
 970         if (!Lists_CheckDupeMask(list, mask))
 971                 return CONNECTED;
 972         Lists_Del(list, mask);
 973
 974         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
 975 }
 976
 977
 978 /**
 979  * Send information about changed channel invite/ban/exception lists to clients.
 980  *
 981  * @param IsAdd true if the list item has been added, false otherwise.
 982  * @param ModeChar The mode to use (e. g. 'b' or 'I')
 983  * @param Prefix The originator of the mode list change.
 984  * @param Client The sender of the command.
 985  * @param Channel The channel of which the list has been modified.
 986  * @param Mask The mask which has been added or removed.
 987  * @return CONNECTED or DISCONNECTED.
 988  */
 989 static bool
 990 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
 991                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
 992 {
 993         bool ok = true;
 994
 995         /* Send confirmation to the client */
 996         if (Client_Type(Client) == CLIENT_USER)
 997                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
 998                                               Channel_Name(Channel),
 999                                               IsAdd ? '+' : '-',
1000                                               ModeChar, Mask);
1001
1002         /* to other servers */
1003         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1004                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1005                                   ModeChar, Mask);
1006
1007         /* and local users in channel */
1008         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1009                                   "MODE %s %c%c %s", Channel_Name(Channel),
1010                                   IsAdd ? '+' : '-', ModeChar, Mask );
1011
1012         return ok;
1013 } /* Send_ListChange */
1014
1015
1016 /* -eof- */