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