src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-write.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "parse.h"
  32 #include "messages.h"
  33 #include "conf.h"
  34
  35 #include "exp.h"
  36 #include "irc-mode.h"
  37
  38
  39 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  40                                 CLIENT *Target));
  41 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42                                  CHANNEL *Channel));
  43
  44 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  45                                 CHANNEL *Channel, const char *Pattern));
  46 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  47                                   CHANNEL *Channel, const char *Pattern));
  48
  49 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  50                                     CLIENT *Prefix, CLIENT *Client,
  51                                     CHANNEL *Channel, const char *Mask));
  52
  53
  54 /**
  55  * Handler for the IRC "MODE" command.
  56  *
  57  * See RFC 2812 section 3.1.5 ("user mode message") and section 3.2.3
  58  * ("channel mode message"), and RFC 2811 section 4 ("channel modes").
  59  *
  60  * @param Client        The client from which this command has been received.
  61  * @param Req           Request structure with prefix and all parameters.
  62  * @returns             CONNECTED or DISCONNECTED.
  63  */
  64 GLOBAL bool
  65 IRC_MODE( CLIENT *Client, REQUEST *Req )
  66 {
  67         CLIENT *cl, *origin;
  68         CHANNEL *chan;
  69
  70         assert(Client != NULL);
  71         assert(Req != NULL);
  72
  73         /* No parameters? */
  74         if (Req->argc < 1)
  75                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  76                                           Client_ID(Client), Req->command);
  77
  78         /* Origin for answers */
  79         if (Client_Type(Client) == CLIENT_SERVER) {
  80                 origin = Client_Search(Req->prefix);
  81                 if (!origin)
  82                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  83                                                   Client_ID(Client),
  84                                                   Req->prefix);
  85         } else
  86                 origin = Client;
  87
  88         /* Channel or user mode? */
  89         cl = NULL; chan = NULL;
  90         if (Client_IsValidNick(Req->argv[0]))
  91                 cl = Client_Search(Req->argv[0]);
  92         if (Channel_IsValidName(Req->argv[0]))
  93                 chan = Channel_Search(Req->argv[0]);
  94
  95         if (cl)
  96                 return Client_Mode(Client, Req, origin, cl);
  97         if (chan)
  98                 return Channel_Mode(Client, Req, origin, chan);
  99
 100         /* No target found! */
 101         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 102                         Client_ID(Client), Req->argv[0]);
 103 } /* IRC_MODE */
 104
 105
 106 /**
 107  * Check if the "mode limit" for a client has been reached.
 108  *
 109  * This limit doesn't apply for servers or services!
 110  *
 111  * @param Client The client to check.
 112  * @param Count The number of modes already handled.
 113  * @return true if the limit has been reached.
 114  */
 115 static bool
 116 Mode_Limit_Reached(CLIENT *Client, int Count)
 117 {
 118         if (Client_Type(Client) == CLIENT_SERVER
 119             || Client_Type(Client) == CLIENT_SERVICE)
 120                 return false;
 121         if (Count < MAX_HNDL_MODES_ARG)
 122                 return false;
 123         return true;
 124 }
 125
 126
 127 /**
 128  * Handle client mode requests
 129  *
 130  * @param Client        The client from which this command has been received.
 131  * @param Req           Request structure with prefix and all parameters.
 132  * @param Origin        The originator of the MODE command (prefix).
 133  * @param Target        The target (client) of this MODE command.
 134  * @returns             CONNECTED or DISCONNECTED.
 135  */
 136 static bool
 137 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 138 {
 139         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 140         bool ok, set;
 141         bool send_RPL_HOSTHIDDEN_MSG = false;
 142         int mode_arg;
 143         size_t len;
 144
 145         /* Is the client allowed to request or change the modes? */
 146         if (Client_Type(Client) == CLIENT_USER) {
 147                 /* Users are only allowed to manipulate their own modes! */
 148                 if (Target != Client)
 149                         return IRC_WriteStrClient(Client,
 150                                                   ERR_USERSDONTMATCH_MSG,
 151                                                   Client_ID(Client));
 152         }
 153
 154         /* Mode request: let's answer it :-) */
 155         if (Req->argc == 1)
 156                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 157                                           Client_ID(Origin),
 158                                           Client_Modes(Target));
 159
 160         mode_arg = 1;
 161         mode_ptr = Req->argv[mode_arg];
 162
 163         /* Initial state: set or unset modes? */
 164         if (*mode_ptr == '+') {
 165                 set = true;
 166                 strcpy(the_modes, "+");
 167         } else if (*mode_ptr == '-') {
 168                 set = false;
 169                 strcpy(the_modes, "-");
 170         } else
 171                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 172                                           Client_ID(Origin));
 173
 174         x[1] = '\0';
 175         ok = CONNECTED;
 176         while (mode_ptr) {
 177                 mode_ptr++;
 178                 if (!*mode_ptr) {
 179                         /* Try next argument if there's any */
 180                         mode_arg++;
 181                         if (mode_arg < Req->argc)
 182                                 mode_ptr = Req->argv[mode_arg];
 183                         else
 184                                 break;
 185                 }
 186
 187                 switch(*mode_ptr) {
 188                   case '+':
 189                   case '-':
 190                         if ((*mode_ptr == '+' && !set)
 191                             || (*mode_ptr == '-' && set)) {
 192                                 /* Action modifier ("+"/"-") must be changed */
 193                                 len = strlen(the_modes) - 1;
 194                                 if (the_modes[len] == '+'
 195                                     || the_modes[len] == '-') {
 196                                         /* Last character in the "result
 197                                          * string" was an "action", so just
 198                                          * overwrite it with the new action */
 199                                         the_modes[len] = *mode_ptr;
 200                                 } else {
 201                                         /* Append new modifier character to
 202                                          * the resulting mode string */
 203                                         x[0] = *mode_ptr;
 204                                         strlcat(the_modes, x,
 205                                                 sizeof(the_modes));
 206                                 }
 207                                 if (*mode_ptr == '+')
 208                                         set = true;
 209                                 else
 210                                         set = false;
 211                         }
 212                         continue;
 213                 }
 214
 215                 /* Validate modes */
 216                 x[0] = '\0';
 217                 switch (*mode_ptr) {
 218                 case 'b': /* Block private msgs */
 219                 case 'C': /* Only messages from clients sharing a channel */
 220                 case 'i': /* Invisible */
 221                 case 's': /* Server messages */
 222                 case 'w': /* Wallops messages */
 223                         x[0] = *mode_ptr;
 224                         break;
 225                 case 'a': /* Away */
 226                         if (Client_Type(Client) == CLIENT_SERVER) {
 227                                 x[0] = 'a';
 228                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 229                         } else
 230                                 ok = IRC_WriteStrClient(Origin,
 231                                                         ERR_NOPRIVILEGES_MSG,
 232                                                         Client_ID(Origin));
 233                         break;
 234                 case 'B': /* Bot */
 235                         if (Client_HasMode(Client, 'r'))
 236                                 ok = IRC_WriteStrClient(Origin,
 237                                                         ERR_RESTRICTED_MSG,
 238                                                         Client_ID(Origin));
 239                         else
 240                                 x[0] = 'B';
 241                         break;
 242                 case 'c': /* Receive connect notices
 243                            * (only settable by IRC operators!) */
 244                         if (!set || Client_Type(Client) == CLIENT_SERVER
 245                             || Client_OperByMe(Origin))
 246                                 x[0] = 'c';
 247                         else
 248                                 ok = IRC_WriteStrClient(Origin,
 249                                                         ERR_NOPRIVILEGES_MSG,
 250                                                         Client_ID(Origin));
 251                         break;
 252                 case 'o': /* IRC operator (only unsettable!) */
 253                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 254                                 Client_SetOperByMe(Target, false);
 255                                 x[0] = 'o';
 256                         } else
 257                                 ok = IRC_WriteStrClient(Origin,
 258                                                         ERR_NOPRIVILEGES_MSG,
 259                                                         Client_ID(Origin));
 260                         break;
 261                 case 'q': /* KICK-protected user */
 262                         if (!set || Client_Type(Client) == CLIENT_SERVER
 263                             || Client_OperByMe(Origin))
 264                                 x[0] = 'q';
 265                         else
 266                                 ok = IRC_WriteStrClient(Origin,
 267                                                         ERR_NOPRIVILEGES_MSG,
 268                                                         Client_ID(Origin));
 269                         break;
 270                 case 'r': /* Restricted (only settable) */
 271                         if (set || Client_Type(Client) == CLIENT_SERVER)
 272                                 x[0] = 'r';
 273                         else
 274                                 ok = IRC_WriteStrClient(Origin,
 275                                                         ERR_RESTRICTED_MSG,
 276                                                         Client_ID(Origin));
 277                         break;
 278                 case 'R': /* Registered (not [un]settable by clients) */
 279                         if (Client_Type(Client) == CLIENT_SERVER)
 280                                 x[0] = 'R';
 281                         else
 282                                 ok = IRC_WriteStrClient(Origin,
 283                                                         ERR_NICKREGISTER_MSG,
 284                                                         Client_ID(Origin));
 285                         break;
 286                 case 'x': /* Cloak hostname */
 287                         if (Client_HasMode(Client, 'r'))
 288                                 ok = IRC_WriteStrClient(Origin,
 289                                                         ERR_RESTRICTED_MSG,
 290                                                         Client_ID(Origin));
 291                         else if (!set || Conf_CloakHostModeX[0]
 292                                  || Client_Type(Client) == CLIENT_SERVER
 293                                  || Client_OperByMe(Client)) {
 294                                 x[0] = 'x';
 295                                 send_RPL_HOSTHIDDEN_MSG = true;
 296                         } else
 297                                 ok = IRC_WriteStrClient(Origin,
 298                                                         ERR_NOPRIVILEGES_MSG,
 299                                                         Client_ID(Origin));
 300                         break;
 301                 default:
 302                         if (Client_Type(Client) != CLIENT_SERVER) {
 303                                 Log(LOG_DEBUG,
 304                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 305                                     set ? '+' : '-', *mode_ptr,
 306                                     Client_ID(Origin));
 307                                 ok = IRC_WriteStrClient(Origin,
 308                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 309                                                         Client_ID(Origin),
 310                                                         set ? '+' : '-',
 311                                                         *mode_ptr);
 312                                 x[0] = '\0';
 313                         } else {
 314                                 Log(LOG_DEBUG,
 315                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 316                                     set ? '+' : '-', *mode_ptr,
 317                                     Client_ID(Origin), Client_ID(Target));
 318                                 x[0] = *mode_ptr;
 319                         }
 320                 }
 321
 322                 if (!ok)
 323                         break;
 324
 325                 /* Is there a valid mode change? */
 326                 if (!x[0])
 327                         continue;
 328
 329                 if (set) {
 330                         if (Client_ModeAdd(Target, x[0]))
 331                                 strlcat(the_modes, x, sizeof(the_modes));
 332                 } else {
 333                         if (Client_ModeDel(Target, x[0]))
 334                                 strlcat(the_modes, x, sizeof(the_modes));
 335                 }
 336         }
 337
 338         /* Are there changed modes? */
 339         if (the_modes[1]) {
 340                 /* Remove needless action modifier characters */
 341                 len = strlen(the_modes) - 1;
 342                 if (the_modes[len] == '+' || the_modes[len] == '-')
 343                         the_modes[len] = '\0';
 344
 345                 if (Client_Type(Client) == CLIENT_SERVER) {
 346                         /* Forward modes to other servers */
 347                         if (Client_Conn(Target) != NONE) {
 348                                 /* Remote server (service?) changed modes
 349                                  * for one of our clients. Inform it! */
 350                                 IRC_WriteStrClientPrefix(Target, Origin,
 351                                                          "MODE %s :%s",
 352                                                          Client_ID(Target),
 353                                                          the_modes);
 354                         }
 355                         IRC_WriteStrServersPrefix(Client, Origin,
 356                                                   "MODE %s :%s",
 357                                                   Client_ID(Target),
 358                                                   the_modes);
 359                 } else {
 360                         /* Send reply to client and inform other servers */
 361                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 362                                                       "MODE %s :%s",
 363                                                       Client_ID(Target),
 364                                                       the_modes);
 365                         IRC_WriteStrServersPrefix(Client, Origin,
 366                                                   "MODE %s :%s",
 367                                                   Client_ID(Target),
 368                                                   the_modes);
 369                         if (send_RPL_HOSTHIDDEN_MSG)
 370                                 IRC_WriteStrClient(Client, RPL_HOSTHIDDEN_MSG,
 371                                                    Client_ID(Client),
 372                                                    Client_HostnameCloaked(Client));
 373                 }
 374                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 375                          Client_TypeText(Target), Client_Mask(Target),
 376                          Client_Modes(Target));
 377         }
 378
 379         IRC_SetPenalty(Client, 1);
 380         return ok;
 381 } /* Client_Mode */
 382
 383
 384 static bool
 385 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 386 {
 387         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 388         const char *mode_ptr;
 389
 390         /* Member or not? -- That's the question! */
 391         if (!Channel_IsMemberOf(Channel, Origin))
 392                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 393                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 394
 395         /* The sender is a member: generate extended reply */
 396         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 397         mode_ptr = the_modes;
 398         the_args[0] = '\0';
 399
 400         while(*mode_ptr) {
 401                 switch(*mode_ptr) {
 402                 case 'l':
 403                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 404                         strlcat(the_args, argadd, sizeof(the_args));
 405                         break;
 406                 case 'k':
 407                         strlcat(the_args, " ", sizeof(the_args));
 408                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 409                         break;
 410                 }
 411                 mode_ptr++;
 412         }
 413         if (the_args[0])
 414                 strlcat(the_modes, the_args, sizeof(the_modes));
 415
 416         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 417                                 Client_ID(Origin), Channel_Name(Channel),
 418                                 the_modes))
 419                 return DISCONNECTED;
 420 #ifndef STRICT_RFC
 421         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 422                                   Client_ID(Origin), Channel_Name(Channel),
 423                                   Channel_CreationTime(Channel)))
 424                 return DISCONNECTED;
 425 #endif
 426         return CONNECTED;
 427 }
 428
 429
 430 /**
 431  * Handle channel mode and channel-user mode changes
 432  */
 433 static bool
 434 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 435 {
 436         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 437             argadd[CLIENT_PASS_LEN], *mode_ptr, *o_mode_ptr;
 438         bool connected, set, skiponce, retval, use_servermode,
 439              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 440         int mode_arg, arg_arg, mode_arg_count = 0;
 441         CLIENT *client;
 442         long l;
 443         size_t len;
 444
 445         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 446
 447         if (Channel_IsModeless(Channel))
 448                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 449                                 Client_ID(Client), Channel_Name(Channel));
 450
 451         /* Mode request: let's answer it :-) */
 452         if (Req->argc <= 1)
 453                 return Channel_Mode_Answer_Request(Origin, Channel);
 454
 455         /* Check if origin is oper and opers can use mode */
 456         use_servermode = Conf_OperServerMode;
 457         if(Client_OperByMe(Client) && Conf_OperCanMode) {
 458                 is_oper = true;
 459         }
 460
 461         /* Check if client is a server/service */
 462         if(Client_Type(Client) == CLIENT_SERVER ||
 463            Client_Type(Client) == CLIENT_SERVICE) {
 464                 is_machine = true;
 465         }
 466
 467         /* Check if client is member of channel or an oper or an server/service */
 468         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 469                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 470                                           Client_ID(Origin),
 471                                           Channel_Name(Channel));
 472
 473         mode_arg = 1;
 474         mode_ptr = Req->argv[mode_arg];
 475         if (Req->argc > mode_arg + 1)
 476                 arg_arg = mode_arg + 1;
 477         else
 478                 arg_arg = -1;
 479
 480         /* Initial state: set or unset modes? */
 481         skiponce = false;
 482         switch (*mode_ptr) {
 483         case '-':
 484                 set = false;
 485                 break;
 486         case '+':
 487                 set = true;
 488                 break;
 489         default:
 490                 set = true;
 491                 skiponce = true;
 492         }
 493
 494         /* Prepare reply string */
 495         strcpy(the_modes, set ? "+" : "-");
 496         the_args[0] = '\0';
 497
 498         x[1] = '\0';
 499         connected = CONNECTED;
 500         while (mode_ptr) {
 501                 if (!skiponce)
 502                         mode_ptr++;
 503                 if (!*mode_ptr) {
 504                         /* Try next argument if there's any */
 505                         if (arg_arg < 0)
 506                                 break;
 507                         if (arg_arg > mode_arg)
 508                                 mode_arg = arg_arg;
 509                         else
 510                                 mode_arg++;
 511
 512                         if (mode_arg >= Req->argc)
 513                                 break;
 514                         mode_ptr = Req->argv[mode_arg];
 515
 516                         if (Req->argc > mode_arg + 1)
 517                                 arg_arg = mode_arg + 1;
 518                         else
 519                                 arg_arg = -1;
 520                 }
 521                 skiponce = false;
 522
 523                 switch (*mode_ptr) {
 524                 case '+':
 525                 case '-':
 526                         if (((*mode_ptr == '+') && !set)
 527                             || ((*mode_ptr == '-') && set)) {
 528                                 /* Action modifier ("+"/"-") must be changed ... */
 529                                 len = strlen(the_modes) - 1;
 530                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 531                                         /* Adjust last action modifier in result */
 532                                         the_modes[len] = *mode_ptr;
 533                                 } else {
 534                                         /* Append modifier character to result string */
 535                                         x[0] = *mode_ptr;
 536                                         strlcat(the_modes, x, sizeof(the_modes));
 537                                 }
 538                                 set = *mode_ptr == '+';
 539                         }
 540                         continue;
 541                 }
 542
 543                 /* Are there arguments left? */
 544                 if (arg_arg >= Req->argc)
 545                         arg_arg = -1;
 546
 547                 if(!is_machine) {
 548                         o_mode_ptr = Channel_UserModes(Channel, Client);
 549                         while( *o_mode_ptr ) {
 550                                 if ( *o_mode_ptr == 'q')
 551                                         is_owner = true;
 552                                 if ( *o_mode_ptr == 'a')
 553                                         is_admin = true;
 554                                 if ( *o_mode_ptr == 'o')
 555                                         is_op = true;
 556                                 if ( *o_mode_ptr == 'h')
 557                                         is_halfop = true;
 558                                 o_mode_ptr++;
 559                         }
 560                 }
 561
 562                 /* Validate modes */
 563                 x[0] = '\0';
 564                 argadd[0] = '\0';
 565                 client = NULL;
 566                 switch (*mode_ptr) {
 567                 /* --- Channel modes --- */
 568                 case 'R': /* Registered users only */
 569                 case 's': /* Secret channel */
 570                 case 'z': /* Secure connections only */
 571                         if(!is_oper && !is_machine && !is_owner &&
 572                            !is_admin && !is_op) {
 573                                 connected = IRC_WriteStrClient(Origin,
 574                                         ERR_CHANOPRIVSNEEDED_MSG,
 575                                         Client_ID(Origin), Channel_Name(Channel));
 576                                 goto chan_exit;
 577                         }
 578                 case 'i': /* Invite only */
 579                 case 'V': /* Invite disallow */
 580                 case 'M': /* Only identified nicks can write */
 581                 case 'm': /* Moderated */
 582                 case 'n': /* Only members can write */
 583                 case 'Q': /* No kicks */
 584                 case 't': /* Topic locked */
 585                         if(is_oper || is_machine || is_owner ||
 586                            is_admin || is_op || is_halfop)
 587                                 x[0] = *mode_ptr;
 588                         else
 589                                 connected = IRC_WriteStrClient(Origin,
 590                                         ERR_CHANOPRIVSNEEDED_MSG,
 591                                         Client_ID(Origin), Channel_Name(Channel));
 592                         break;
 593                 case 'k': /* Channel key */
 594                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 595                                 goto chan_exit;
 596                         if (!set) {
 597                                 if (is_oper || is_machine || is_owner ||
 598                                     is_admin || is_op || is_halfop)
 599                                         x[0] = *mode_ptr;
 600                                 else
 601                                         connected = IRC_WriteStrClient(Origin,
 602                                                 ERR_CHANOPRIVSNEEDED_MSG,
 603                                                 Client_ID(Origin),
 604                                                 Channel_Name(Channel));
 605                                 break;
 606                         }
 607                         if (arg_arg > mode_arg) {
 608                                 if (is_oper || is_machine || is_owner ||
 609                                     is_admin || is_op || is_halfop) {
 610                                         Channel_ModeDel(Channel, 'k');
 611                                         Channel_SetKey(Channel,
 612                                                        Req->argv[arg_arg]);
 613                                         strlcpy(argadd, Channel_Key(Channel),
 614                                                 sizeof(argadd));
 615                                         x[0] = *mode_ptr;
 616                                 } else {
 617                                         connected = IRC_WriteStrClient(Origin,
 618                                                 ERR_CHANOPRIVSNEEDED_MSG,
 619                                                 Client_ID(Origin),
 620                                                 Channel_Name(Channel));
 621                                 }
 622                                 Req->argv[arg_arg][0] = '\0';
 623                                 arg_arg++;
 624                         } else {
 625                                 connected = IRC_WriteStrClient(Origin,
 626                                         ERR_NEEDMOREPARAMS_MSG,
 627                                         Client_ID(Origin), Req->command);
 628                                 goto chan_exit;
 629                         }
 630                         break;
 631                 case 'l': /* Member limit */
 632                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 633                                 goto chan_exit;
 634                         if (!set) {
 635                                 if (is_oper || is_machine || is_owner ||
 636                                     is_admin || is_op || is_halfop)
 637                                         x[0] = *mode_ptr;
 638                                 else
 639                                         connected = IRC_WriteStrClient(Origin,
 640                                                 ERR_CHANOPRIVSNEEDED_MSG,
 641                                                 Client_ID(Origin),
 642                                                 Channel_Name(Channel));
 643                                 break;
 644                         }
 645                         if (arg_arg > mode_arg) {
 646                                 if (is_oper || is_machine || is_owner ||
 647                                     is_admin || is_op || is_halfop) {
 648                                         l = atol(Req->argv[arg_arg]);
 649                                         if (l > 0 && l < 0xFFFF) {
 650                                                 Channel_ModeDel(Channel, 'l');
 651                                                 Channel_SetMaxUsers(Channel, l);
 652                                                 snprintf(argadd, sizeof(argadd),
 653                                                          "%ld", l);
 654                                                 x[0] = *mode_ptr;
 655                                         }
 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                 case 'O': /* IRC operators only */
 672                         if (set) {
 673                                 /* Only IRC operators are allowed to
 674                                  * set the 'O' channel mode! */
 675                                 if(is_oper || is_machine)
 676                                         x[0] = 'O';
 677                                 else
 678                                         connected = IRC_WriteStrClient(Origin,
 679                                                 ERR_NOPRIVILEGES_MSG,
 680                                                 Client_ID(Origin));
 681                         } else if(is_oper || is_machine || is_owner ||
 682                                   is_admin || is_op)
 683                                 x[0] = 'O';
 684                         else
 685                                 connected = IRC_WriteStrClient(Origin,
 686                                         ERR_CHANOPRIVSNEEDED_MSG,
 687                                         Client_ID(Origin),
 688                                         Channel_Name(Channel));
 689                         break;
 690                 case 'P': /* Persistent channel */
 691                         if (set) {
 692                                 /* Only IRC operators are allowed to
 693                                  * set the 'P' channel mode! */
 694                                 if(is_oper || is_machine)
 695                                         x[0] = 'P';
 696                                 else
 697                                         connected = IRC_WriteStrClient(Origin,
 698                                                 ERR_NOPRIVILEGES_MSG,
 699                                                 Client_ID(Origin));
 700                         } else if(is_oper || is_machine || is_owner ||
 701                                   is_admin || is_op)
 702                                 x[0] = 'P';
 703                         else
 704                                 connected = IRC_WriteStrClient(Origin,
 705                                         ERR_CHANOPRIVSNEEDED_MSG,
 706                                         Client_ID(Origin),
 707                                         Channel_Name(Channel));
 708                         break;
 709                 /* --- Channel user modes --- */
 710                 case 'q': /* Owner */
 711                 case 'a': /* Channel admin */
 712                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 713                                 connected = IRC_WriteStrClient(Origin,
 714                                         ERR_CHANOPPRIVTOOLOW_MSG,
 715                                         Client_ID(Origin),
 716                                         Channel_Name(Channel));
 717                                 goto chan_exit;
 718                         }
 719                 case 'o': /* Channel operator */
 720                         if(!is_oper && !is_machine && !is_owner &&
 721                            !is_admin && !is_op) {
 722                                 connected = IRC_WriteStrClient(Origin,
 723                                         ERR_CHANOPRIVSNEEDED_MSG,
 724                                         Client_ID(Origin),
 725                                         Channel_Name(Channel));
 726                                 goto chan_exit;
 727                         }
 728                 case 'h': /* Half Op */
 729                         if(!is_oper && !is_machine && !is_owner &&
 730                            !is_admin && !is_op) {
 731                                 connected = IRC_WriteStrClient(Origin,
 732                                         ERR_CHANOPRIVSNEEDED_MSG,
 733                                         Client_ID(Origin),
 734                                         Channel_Name(Channel));
 735                                 goto chan_exit;
 736                         }
 737                 case 'v': /* Voice */
 738                         if (arg_arg > mode_arg) {
 739                                 if (is_oper || is_machine || is_owner ||
 740                                     is_admin || is_op || is_halfop) {
 741                                         client = Client_Search(Req->argv[arg_arg]);
 742                                         if (client)
 743                                                 x[0] = *mode_ptr;
 744                                         else
 745                                                 connected = IRC_WriteStrClient(Origin,
 746                                                         ERR_NOSUCHNICK_MSG,
 747                                                         Client_ID(Origin),
 748                                                         Req->argv[arg_arg]);
 749                                 } else {
 750                                         connected = IRC_WriteStrClient(Origin,
 751                                                 ERR_CHANOPRIVSNEEDED_MSG,
 752                                                 Client_ID(Origin),
 753                                                 Channel_Name(Channel));
 754                                 }
 755                                 Req->argv[arg_arg][0] = '\0';
 756                                 arg_arg++;
 757                         } else {
 758                                 connected = IRC_WriteStrClient(Origin,
 759                                         ERR_NEEDMOREPARAMS_MSG,
 760                                         Client_ID(Origin), Req->command);
 761                                 goto chan_exit;
 762                         }
 763                         break;
 764                 /* --- Channel lists --- */
 765                 case 'I': /* Invite lists */
 766                 case 'b': /* Ban lists */
 767                 case 'e': /* Channel exception lists */
 768                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 769                                 goto chan_exit;
 770                         if (arg_arg > mode_arg) {
 771                                 /* modify list */
 772                                 if (is_oper || is_machine || is_owner ||
 773                                     is_admin || is_op || is_halfop) {
 774                                         connected = set
 775                                            ? Add_To_List(*mode_ptr, Origin,
 776                                                 Client, Channel,
 777                                                 Req->argv[arg_arg])
 778                                            : Del_From_List(*mode_ptr, Origin,
 779                                                 Client, Channel,
 780                                                 Req->argv[arg_arg]);
 781                                 } else {
 782                                         connected = IRC_WriteStrClient(Origin,
 783                                                 ERR_CHANOPRIVSNEEDED_MSG,
 784                                                 Client_ID(Origin),
 785                                                 Channel_Name(Channel));
 786                                 }
 787                                 Req->argv[arg_arg][0] = '\0';
 788                                 arg_arg++;
 789                         } else {
 790                                 switch (*mode_ptr) {
 791                                 case 'I':
 792                                         Channel_ShowInvites(Origin, Channel);
 793                                         break;
 794                                 case 'b':
 795                                         Channel_ShowBans(Origin, Channel);
 796                                         break;
 797                                 case 'e':
 798                                         Channel_ShowExcepts(Origin, Channel);
 799                                         break;
 800                                 }
 801                         }
 802                         break;
 803                 default:
 804                         if (Client_Type(Client) != CLIENT_SERVER) {
 805                                 Log(LOG_DEBUG,
 806                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 807                                     set ? '+' : '-', *mode_ptr,
 808                                     Client_ID(Origin), Channel_Name(Channel));
 809                                 connected = IRC_WriteStrClient(Origin,
 810                                         ERR_UNKNOWNMODE_MSG,
 811                                         Client_ID(Origin), *mode_ptr,
 812                                         Channel_Name(Channel));
 813                                 x[0] = '\0';
 814                         } else {
 815                                 Log(LOG_DEBUG,
 816                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 817                                     set ? '+' : '-', *mode_ptr,
 818                                     Client_ID(Origin), Channel_Name(Channel));
 819                                 x[0] = *mode_ptr;
 820                         }
 821                 }
 822
 823                 if (!connected)
 824                         break;
 825
 826                 /* Is there a valid mode change? */
 827                 if (!x[0])
 828                         continue;
 829
 830                 /* Validate target client */
 831                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 832                         if (!IRC_WriteStrClient
 833                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 834                              Client_ID(Origin), Client_ID(client),
 835                              Channel_Name(Channel)))
 836                                 break;
 837
 838                         continue;
 839                 }
 840
 841                 if (client) {
 842                         /* Channel-User-Mode */
 843                         retval = set
 844                                ? Channel_UserModeAdd(Channel, client, x[0])
 845                                : Channel_UserModeDel(Channel, client, x[0]);
 846                         if (retval) {
 847                                 strlcat(the_args, " ", sizeof(the_args));
 848                                 strlcat(the_args, Client_ID(client),
 849                                         sizeof(the_args));
 850                                 strlcat(the_modes, x, sizeof(the_modes));
 851                                 LogDebug
 852                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 853                                      Client_Mask(client), Channel_Name(Channel),
 854                                      Channel_UserModes(Channel, client));
 855                         }
 856                 } else {
 857                         /* Channel-Mode */
 858                         retval = set
 859                                ? Channel_ModeAdd(Channel, x[0])
 860                                : Channel_ModeDel(Channel, x[0]);
 861                         if (retval) {
 862                                 strlcat(the_modes, x, sizeof(the_modes));
 863                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 864                                          Channel_Name(Channel),
 865                                          Channel_Modes(Channel));
 866                         }
 867                 }
 868
 869                 /* Are there additional arguments to add? */
 870                 if (argadd[0]) {
 871                         strlcat(the_args, " ", sizeof(the_args));
 872                         strlcat(the_args, argadd, sizeof(the_args));
 873                 }
 874         }
 875
 876       chan_exit:
 877         /* Are there changed modes? */
 878         if (the_modes[1]) {
 879                 /* Clean up mode string */
 880                 len = strlen(the_modes) - 1;
 881                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 882                         the_modes[len] = '\0';
 883
 884                 if (Client_Type(Client) == CLIENT_SERVER) {
 885                         /* MODE requests for local channels from other servers
 886                          * are definitely invalid! */
 887                         if (Channel_IsLocal(Channel)) {
 888                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 889                                 return CONNECTED;
 890                         }
 891
 892                         /* Forward mode changes to channel users and all the
 893                          * other remote servers: */
 894                         IRC_WriteStrServersPrefix(Client, Origin,
 895                                 "MODE %s %s%s", Channel_Name(Channel),
 896                                 the_modes, the_args);
 897                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 898                                 false, "MODE %s %s%s", Channel_Name(Channel),
 899                                 the_modes, the_args);
 900                 } else {
 901                         if (use_servermode)
 902                                 Origin = Client_ThisServer();
 903                         /* Send reply to client and inform other servers and channel users */
 904                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 905                                         "MODE %s %s%s", Channel_Name(Channel),
 906                                         the_modes, the_args);
 907                         /* Only forward requests for non-local channels */
 908                         if (!Channel_IsLocal(Channel))
 909                                 IRC_WriteStrServersPrefix(Client, Origin,
 910                                         "MODE %s %s%s", Channel_Name(Channel),
 911                                         the_modes, the_args);
 912                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 913                                 false, "MODE %s %s%s", Channel_Name(Channel),
 914                                 the_modes, the_args);
 915                 }
 916         }
 917
 918         IRC_SetPenalty(Client, 1);
 919         return connected;
 920 } /* Channel_Mode */
 921
 922
 923 GLOBAL bool
 924 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 925 {
 926         assert( Client != NULL );
 927         assert( Req != NULL );
 928
 929         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 930
 931         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 932         {
 933                 Client_SetAway( Client, Req->argv[0] );
 934                 Client_ModeAdd( Client, 'a' );
 935                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 936                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 937         }
 938         else
 939         {
 940                 Client_ModeDel( Client, 'a' );
 941                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 942                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 943         }
 944 } /* IRC_AWAY */
 945
 946
 947 /**
 948  * Add entries to channel invite, ban and exception lists.
 949  *
 950  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 951  * @param Prefix The originator of the command.
 952  * @param Client The sender of the command.
 953  * @param Channel The channel of which the list should be modified.
 954  * @param Pattern The pattern to add to the list.
 955  * @return CONNECTED or DISCONNECTED.
 956  */
 957 static bool
 958 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 959             const char *Pattern)
 960 {
 961         const char *mask;
 962         struct list_head *list = NULL;
 963         long int current_count;
 964
 965         assert(Client != NULL);
 966         assert(Channel != NULL);
 967         assert(Pattern != NULL);
 968         assert(what == 'I' || what == 'b' || what == 'e');
 969
 970         mask = Lists_MakeMask(Pattern);
 971         current_count = Lists_Count(Channel_GetListInvites(Channel))
 972                         + Lists_Count(Channel_GetListExcepts(Channel))
 973                         + Lists_Count(Channel_GetListBans(Channel));
 974
 975         switch(what) {
 976                 case 'I':
 977                         list = Channel_GetListInvites(Channel);
 978                         break;
 979                 case 'b':
 980                         list = Channel_GetListBans(Channel);
 981                         break;
 982                 case 'e':
 983                         list = Channel_GetListExcepts(Channel);
 984                         break;
 985         }
 986
 987         if (Lists_CheckDupeMask(list, mask))
 988                 return CONNECTED;
 989         if (Client_Type(Client) == CLIENT_USER &&
 990             current_count >= MAX_HNDL_CHANNEL_LISTS)
 991                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
 992                                           Client_ID(Client),
 993                                           Channel_Name(Channel), mask,
 994                                           MAX_HNDL_CHANNEL_LISTS);
 995
 996         switch (what) {
 997                 case 'I':
 998                         if (!Channel_AddInvite(Channel, mask, false))
 999                                 return CONNECTED;
1000                         break;
1001                 case 'b':
1002                         if (!Channel_AddBan(Channel, mask))
1003                                 return CONNECTED;
1004                         break;
1005                 case 'e':
1006                         if (!Channel_AddExcept(Channel, mask))
1007                                 return CONNECTED;
1008                         break;
1009         }
1010         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1011 }
1012
1013
1014 /**
1015  * Delete entries from channel invite, ban and exeption lists.
1016  *
1017  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1018  * @param Prefix The originator of the command.
1019  * @param Client The sender of the command.
1020  * @param Channel The channel of which the list should be modified.
1021  * @param Pattern The pattern to add to the list.
1022  * @return CONNECTED or DISCONNECTED.
1023  */
1024 static bool
1025 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1026               const char *Pattern)
1027 {
1028         const char *mask;
1029         struct list_head *list = NULL;
1030
1031         assert(Client != NULL);
1032         assert(Channel != NULL);
1033         assert(Pattern != NULL);
1034         assert(what == 'I' || what == 'b' || what == 'e');
1035
1036         mask = Lists_MakeMask(Pattern);
1037
1038         switch (what) {
1039                 case 'I':
1040                         list = Channel_GetListInvites(Channel);
1041                         break;
1042                 case 'b':
1043                         list = Channel_GetListBans(Channel);
1044                         break;
1045                 case 'e':
1046                         list = Channel_GetListExcepts(Channel);
1047                         break;
1048         }
1049
1050         if (!Lists_CheckDupeMask(list, mask))
1051                 return CONNECTED;
1052         Lists_Del(list, mask);
1053
1054         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1055 }
1056
1057
1058 /**
1059  * Send information about changed channel invite/ban/exception lists to clients.
1060  *
1061  * @param IsAdd true if the list item has been added, false otherwise.
1062  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1063  * @param Prefix The originator of the mode list change.
1064  * @param Client The sender of the command.
1065  * @param Channel The channel of which the list has been modified.
1066  * @param Mask The mask which has been added or removed.
1067  * @return CONNECTED or DISCONNECTED.
1068  */
1069 static bool
1070 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1071                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1072 {
1073         bool ok = true;
1074
1075         /* Send confirmation to the client */
1076         if (Client_Type(Client) == CLIENT_USER)
1077                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1078                                               Channel_Name(Channel),
1079                                               IsAdd ? '+' : '-',
1080                                               ModeChar, Mask);
1081
1082         /* to other servers */
1083         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1084                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1085                                   ModeChar, Mask);
1086
1087         /* and local users in channel */
1088         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1089                                   "MODE %s %c%c %s", Channel_Name(Channel),
1090                                   IsAdd ? '+' : '-', ModeChar, Mask );
1091
1092         return ok;
1093 } /* Send_ListChange */
1094
1095
1096 /* -eof- */