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