src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2014 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 <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include "conn.h"
  25 #include "channel.h"
  26 #include "irc-macros.h"
  27 #include "irc-write.h"
  28 #include "lists.h"
  29 #include "log.h"
  30 #include "parse.h"
  31 #include "messages.h"
  32 #include "conf.h"
  33
  34 #include "irc-mode.h"
  35
  36 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  37                                 CLIENT *Target));
  38 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  39                                  CHANNEL *Channel));
  40
  41 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  42                                 CHANNEL *Channel, const char *Pattern));
  43 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  44                                   CHANNEL *Channel, const char *Pattern));
  45
  46 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  47                                     CLIENT *Prefix, CLIENT *Client,
  48                                     CHANNEL *Channel, const char *Mask));
  49
  50 /**
  51  * Handler for the IRC "MODE" command.
  52  *
  53  * This function detects whether user or channel modes should be modified
  54  * and calls the appropriate sub-functions.
  55  *
  56  * @param Client The client from which this command has been received.
  57  * @param Req Request structure with prefix and all parameters.
  58  * @return CONNECTED or DISCONNECTED.
  59  */
  60 GLOBAL bool
  61 IRC_MODE( CLIENT *Client, REQUEST *Req )
  62 {
  63         CLIENT *cl, *origin;
  64         CHANNEL *chan;
  65
  66         assert(Client != NULL);
  67         assert(Req != NULL);
  68
  69         _IRC_GET_SENDER_OR_RETURN_(origin, Req, Client)
  70
  71         /* Test for "fake" MODE commands injected by this local instance,
  72          * for example when handling the "DefaultUserModes" settings.
  73          * This doesn't harm real commands, because prefixes of regular
  74          * clients are checked in Validate_Prefix() and can't be faked. */
  75         if (Req->prefix && Client_Search(Req->prefix) == Client_ThisServer())
  76                 Client = Client_Search(Req->prefix);
  77
  78         /* Channel or user mode? */
  79         cl = NULL; chan = NULL;
  80         if (Client_IsValidNick(Req->argv[0]))
  81                 cl = Client_Search(Req->argv[0]);
  82         if (Channel_IsValidName(Req->argv[0]))
  83                 chan = Channel_Search(Req->argv[0]);
  84
  85         if (cl)
  86                 return Client_Mode(Client, Req, origin, cl);
  87         if (chan)
  88                 return Channel_Mode(Client, Req, origin, chan);
  89
  90         /* No target found! */
  91         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
  92                         Client_ID(Client), Req->argv[0]);
  93 } /* IRC_MODE */
  94
  95 /**
  96  * Check if the "mode limit" for a client has been reached.
  97  *
  98  * This limit doesn't apply for servers or services!
  99  *
 100  * @param Client The client to check.
 101  * @param Count The number of modes already handled.
 102  * @return true if the limit has been reached.
 103  */
 104 static bool
 105 Mode_Limit_Reached(CLIENT *Client, int Count)
 106 {
 107         if (Client_Type(Client) == CLIENT_SERVER
 108             || Client_Type(Client) == CLIENT_SERVICE)
 109                 return false;
 110         if (Count < MAX_HNDL_MODES_ARG)
 111                 return false;
 112         return true;
 113 }
 114
 115 /**
 116  * Handle client mode requests
 117  *
 118  * @param Client The client from which this command has been received.
 119  * @param Req Request structure with prefix and all parameters.
 120  * @param Origin The originator of the MODE command (prefix).
 121  * @param Target The target (client) of this MODE command.
 122  * @return CONNECTED or DISCONNECTED.
 123  */
 124 static bool
 125 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 126 {
 127         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 128         bool ok, set;
 129         bool send_RPL_HOSTHIDDEN_MSG = false;
 130         int mode_arg;
 131         size_t len;
 132
 133         /* Is the client allowed to request or change the modes? */
 134         if (Client_Type(Client) == CLIENT_USER) {
 135                 /* Users are only allowed to manipulate their own modes! */
 136                 if (Target != Client)
 137                         return IRC_WriteErrClient(Client,
 138                                                   ERR_USERSDONTMATCH_MSG,
 139                                                   Client_ID(Client));
 140         }
 141
 142         /* Mode request: let's answer it :-) */
 143         if (Req->argc == 1)
 144                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 145                                           Client_ID(Target),
 146                                           Client_Modes(Target));
 147
 148         mode_arg = 1;
 149         mode_ptr = Req->argv[mode_arg];
 150
 151         /* Initial state: set or unset modes? */
 152         if (*mode_ptr == '+') {
 153                 set = true;
 154                 strcpy(the_modes, "+");
 155         } else if (*mode_ptr == '-') {
 156                 set = false;
 157                 strcpy(the_modes, "-");
 158         } else
 159                 return IRC_WriteErrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 160                                           Client_ID(Origin));
 161
 162         x[1] = '\0';
 163         ok = CONNECTED;
 164         while (mode_ptr) {
 165                 mode_ptr++;
 166                 if (!*mode_ptr) {
 167                         /* Try next argument if there's any */
 168                         mode_arg++;
 169                         if (mode_arg < Req->argc)
 170                                 mode_ptr = Req->argv[mode_arg];
 171                         else
 172                                 break;
 173                 }
 174
 175                 switch(*mode_ptr) {
 176                   case '+':
 177                   case '-':
 178                         if ((*mode_ptr == '+' && !set)
 179                             || (*mode_ptr == '-' && set)) {
 180                                 /* Action modifier ("+"/"-") must be changed */
 181                                 len = strlen(the_modes) - 1;
 182                                 if (the_modes[len] == '+'
 183                                     || the_modes[len] == '-') {
 184                                         /* Last character in the "result
 185                                          * string" was an "action", so just
 186                                          * overwrite it with the new action */
 187                                         the_modes[len] = *mode_ptr;
 188                                 } else {
 189                                         /* Append new modifier character to
 190                                          * the resulting mode string */
 191                                         x[0] = *mode_ptr;
 192                                         strlcat(the_modes, x,
 193                                                 sizeof(the_modes));
 194                                 }
 195                                 if (*mode_ptr == '+')
 196                                         set = true;
 197                                 else
 198                                         set = false;
 199                         }
 200                         continue;
 201                 }
 202
 203                 /* Validate modes */
 204                 x[0] = '\0';
 205                 switch (*mode_ptr) {
 206                 case 'b': /* Block private msgs */
 207                 case 'C': /* Only messages from clients sharing a channel */
 208                 case 'i': /* Invisible */
 209                 case 's': /* Server messages */
 210                 case 'w': /* Wallops messages */
 211                         x[0] = *mode_ptr;
 212                         break;
 213                 case 'a': /* Away */
 214                         if (Client_Type(Client) == CLIENT_SERVER) {
 215                                 x[0] = 'a';
 216                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 217                         } else
 218                                 ok = IRC_WriteErrClient(Origin,
 219                                                         ERR_NOPRIVILEGES_MSG,
 220                                                         Client_ID(Origin));
 221                         break;
 222                 case 'B': /* Bot */
 223                         if (Client_HasMode(Client, 'r'))
 224                                 ok = IRC_WriteErrClient(Origin,
 225                                                         ERR_RESTRICTED_MSG,
 226                                                         Client_ID(Origin));
 227                         else
 228                                 x[0] = 'B';
 229                         break;
 230                 case 'c': /* Receive connect notices */
 231                 case 'q': /* KICK-protected user */
 232                 case 'F': /* disable flood protection */
 233                           /* (only settable by IRC operators!) */
 234                         if (!set || Client_Type(Client) == CLIENT_SERVER
 235                             || Client_HasMode(Origin, 'o'))
 236                                 x[0] = *mode_ptr;
 237                         else
 238                                 ok = IRC_WriteErrClient(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                                 x[0] = 'o';
 245                         } else
 246                                 ok = IRC_WriteErrClient(Origin,
 247                                                         ERR_NOPRIVILEGES_MSG,
 248                                                         Client_ID(Origin));
 249                         break;
 250                 case 'r': /* Restricted (only settable) */
 251                         if (set || Client_Type(Client) == CLIENT_SERVER)
 252                                 x[0] = 'r';
 253                         else
 254                                 ok = IRC_WriteErrClient(Origin,
 255                                                         ERR_RESTRICTED_MSG,
 256                                                         Client_ID(Origin));
 257                         break;
 258                 case 'R': /* Registered (not [un]settable by clients) */
 259                         if (Client_Type(Client) == CLIENT_SERVER)
 260                                 x[0] = 'R';
 261                         else
 262                                 ok = IRC_WriteErrClient(Origin,
 263                                                         ERR_NICKREGISTER_MSG,
 264                                                         Client_ID(Origin));
 265                         break;
 266                 case 'x': /* Cloak hostname */
 267                         if (Client_HasMode(Client, 'r'))
 268                                 ok = IRC_WriteErrClient(Origin,
 269                                                         ERR_RESTRICTED_MSG,
 270                                                         Client_ID(Origin));
 271                         else if (!set || Conf_CloakHostModeX[0]
 272                                  || Client_Type(Client) == CLIENT_SERVER
 273                                  || Client_HasMode(Origin, 'o')) {
 274                                 x[0] = 'x';
 275                                 send_RPL_HOSTHIDDEN_MSG = true;
 276                         } else
 277                                 ok = IRC_WriteErrClient(Origin,
 278                                                         ERR_NOPRIVILEGES_MSG,
 279                                                         Client_ID(Origin));
 280                         break;
 281                 default:
 282                         if (Client_Type(Client) != CLIENT_SERVER) {
 283                                 Log(LOG_DEBUG,
 284                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 285                                     set ? '+' : '-', *mode_ptr,
 286                                     Client_ID(Origin));
 287                                 ok = IRC_WriteErrClient(Origin,
 288                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 289                                                         Client_ID(Origin),
 290                                                         set ? '+' : '-',
 291                                                         *mode_ptr);
 292                                 x[0] = '\0';
 293                         } else {
 294                                 Log(LOG_DEBUG,
 295                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 296                                     set ? '+' : '-', *mode_ptr,
 297                                     Client_ID(Origin), Client_ID(Target));
 298                                 x[0] = *mode_ptr;
 299                         }
 300                 }
 301
 302                 if (!ok)
 303                         break;
 304
 305                 /* Is there a valid mode change? */
 306                 if (!x[0])
 307                         continue;
 308
 309                 if (set) {
 310                         if (Client_ModeAdd(Target, x[0]))
 311                                 strlcat(the_modes, x, sizeof(the_modes));
 312                 } else {
 313                         if (Client_ModeDel(Target, x[0]))
 314                                 strlcat(the_modes, x, sizeof(the_modes));
 315                 }
 316         }
 317
 318         /* Are there changed modes? */
 319         if (the_modes[1]) {
 320                 /* Remove needless action modifier characters */
 321                 len = strlen(the_modes) - 1;
 322                 if (the_modes[len] == '+' || the_modes[len] == '-')
 323                         the_modes[len] = '\0';
 324
 325                 if (Client_Type(Client) == CLIENT_SERVER) {
 326                         /* Forward modes to other servers */
 327                         if (Client_Conn(Target) != NONE) {
 328                                 /* Remote server (service?) changed modes
 329                                  * for one of our clients. Inform it! */
 330                                 IRC_WriteStrClientPrefix(Target, Origin,
 331                                                          "MODE %s :%s",
 332                                                          Client_ID(Target),
 333                                                          the_modes);
 334                         }
 335                         IRC_WriteStrServersPrefix(Client, Origin,
 336                                                   "MODE %s :%s",
 337                                                   Client_ID(Target),
 338                                                   the_modes);
 339                 } else {
 340                         /* Send reply to client and inform other servers */
 341                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 342                                                       "MODE %s :%s",
 343                                                       Client_ID(Target),
 344                                                       the_modes);
 345                         IRC_WriteStrServersPrefix(Client, Origin,
 346                                                   "MODE %s :%s",
 347                                                   Client_ID(Target),
 348                                                   the_modes);
 349                 }
 350
 351                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 352                         /* A new (cloaked) hostname must be announced */
 353                         IRC_WriteStrClientPrefix(Target, Origin,
 354                                                  RPL_HOSTHIDDEN_MSG,
 355                                                  Client_ID(Target),
 356                                                  Client_HostnameDisplayed(Target));
 357
 358                 }
 359
 360                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 361                          Client_TypeText(Target), Client_Mask(Target),
 362                          Client_Modes(Target));
 363         }
 364
 365         return ok;
 366 } /* Client_Mode */
 367
 368 /*
 369  * Reply to a channel mode request.
 370  *
 371  * @param Origin The originator of the MODE command (prefix).
 372  * @param Channel The channel of which the modes should be sent.
 373  * @return CONNECTED or DISCONNECTED.
 374  */
 375 static bool
 376 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 377 {
 378         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 379         const char *mode_ptr;
 380
 381         /* Member or not? -- That's the question! */
 382         if (!Channel_IsMemberOf(Channel, Origin))
 383                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 384                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 385
 386         /* The sender is a member: generate extended reply */
 387         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 388         mode_ptr = the_modes;
 389         the_args[0] = '\0';
 390
 391         while(*mode_ptr) {
 392                 switch(*mode_ptr) {
 393                 case 'l':
 394                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 395                         strlcat(the_args, argadd, sizeof(the_args));
 396                         break;
 397                 case 'k':
 398                         strlcat(the_args, " ", sizeof(the_args));
 399                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 400                         break;
 401                 }
 402                 mode_ptr++;
 403         }
 404         if (the_args[0])
 405                 strlcat(the_modes, the_args, sizeof(the_modes));
 406
 407         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 408                                 Client_ID(Origin), Channel_Name(Channel),
 409                                 the_modes))
 410                 return DISCONNECTED;
 411 #ifndef STRICT_RFC
 412         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 413                                   Client_ID(Origin), Channel_Name(Channel),
 414                                   Channel_CreationTime(Channel)))
 415                 return DISCONNECTED;
 416 #endif
 417         return CONNECTED;
 418 }
 419
 420 /**
 421  * Handle channel mode and channel-user mode changes
 422  *
 423  * @param Client The client from which this command has been received.
 424  * @param Req Request structure with prefix and all parameters.
 425  * @param Origin The originator of the MODE command (prefix).
 426  * @param Channel The target channel of this MODE command.
 427  * @return CONNECTED or DISCONNECTED.
 428  */
 429 static bool
 430 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 431 {
 432         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 433             argadd[CLIENT_PASS_LEN], *mode_ptr;
 434         bool connected, set, skiponce, retval, use_servermode,
 435              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 436         int mode_arg, arg_arg, mode_arg_count = 0;
 437         CLIENT *client;
 438         long l;
 439         size_t len;
 440
 441         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 442
 443         if (Channel_IsModeless(Channel))
 444                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 445                                 Client_ID(Client), Channel_Name(Channel));
 446
 447         /* Mode request: let's answer it :-) */
 448         if (Req->argc <= 1)
 449                 return Channel_Mode_Answer_Request(Origin, Channel);
 450
 451         /* Check if origin is oper and opers can use mode */
 452         use_servermode = Conf_OperServerMode;
 453         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 454                 is_oper = true;
 455         }
 456
 457         /* Check if client is a server/service */
 458         if(Client_Type(Client) == CLIENT_SERVER ||
 459            Client_Type(Client) == CLIENT_SERVICE) {
 460                 is_machine = true;
 461         }
 462
 463         /* Check if client is member of channel or an oper or an server/service */
 464         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 465                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 466                                           Client_ID(Origin),
 467                                           Channel_Name(Channel));
 468
 469         mode_arg = 1;
 470         mode_ptr = Req->argv[mode_arg];
 471         if (Req->argc > mode_arg + 1)
 472                 arg_arg = mode_arg + 1;
 473         else
 474                 arg_arg = -1;
 475
 476         /* Initial state: set or unset modes? */
 477         skiponce = false;
 478         switch (*mode_ptr) {
 479         case '-':
 480                 set = false;
 481                 break;
 482         case '+':
 483                 set = true;
 484                 break;
 485         default:
 486                 set = true;
 487                 skiponce = true;
 488         }
 489
 490         /* Prepare reply string */
 491         strcpy(the_modes, set ? "+" : "-");
 492         the_args[0] = '\0';
 493
 494         x[1] = '\0';
 495         connected = CONNECTED;
 496         while (mode_ptr) {
 497                 if (!skiponce)
 498                         mode_ptr++;
 499                 if (!*mode_ptr) {
 500                         /* Try next argument if there's any */
 501                         if (arg_arg < 0)
 502                                 break;
 503                         if (arg_arg > mode_arg)
 504                                 mode_arg = arg_arg;
 505                         else
 506                                 mode_arg++;
 507
 508                         if (mode_arg >= Req->argc)
 509                                 break;
 510                         mode_ptr = Req->argv[mode_arg];
 511
 512                         if (Req->argc > mode_arg + 1)
 513                                 arg_arg = mode_arg + 1;
 514                         else
 515                                 arg_arg = -1;
 516                 }
 517                 skiponce = false;
 518
 519                 switch (*mode_ptr) {
 520                 case '+':
 521                 case '-':
 522                         if (((*mode_ptr == '+') && !set)
 523                             || ((*mode_ptr == '-') && set)) {
 524                                 /* Action modifier ("+"/"-") must be changed ... */
 525                                 len = strlen(the_modes) - 1;
 526                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 527                                         /* Adjust last action modifier in result */
 528                                         the_modes[len] = *mode_ptr;
 529                                 } else {
 530                                         /* Append modifier character to result string */
 531                                         x[0] = *mode_ptr;
 532                                         strlcat(the_modes, x, sizeof(the_modes));
 533                                 }
 534                                 set = *mode_ptr == '+';
 535                         }
 536                         continue;
 537                 }
 538
 539                 /* Are there arguments left? */
 540                 if (arg_arg >= Req->argc)
 541                         arg_arg = -1;
 542
 543                 if(!is_machine && !is_oper) {
 544                         if (Channel_UserHasMode(Channel, Client, 'q'))
 545                                 is_owner = true;
 546                         if (Channel_UserHasMode(Channel, Client, 'a'))
 547                                 is_admin = true;
 548                         if (Channel_UserHasMode(Channel, Client, 'o'))
 549                                 is_op = true;
 550                         if (Channel_UserHasMode(Channel, Client, 'h'))
 551                                 is_halfop = true;
 552                 }
 553
 554                 /* Validate modes */
 555                 x[0] = '\0';
 556                 argadd[0] = '\0';
 557                 client = NULL;
 558                 switch (*mode_ptr) {
 559                 /* --- Channel modes --- */
 560                 case 'R': /* Registered users only */
 561                 case 's': /* Secret channel */
 562                 case 'z': /* Secure connections only */
 563                         if(!is_oper && !is_machine && !is_owner &&
 564                            !is_admin && !is_op) {
 565                                 connected = IRC_WriteErrClient(Origin,
 566                                         ERR_CHANOPRIVSNEEDED_MSG,
 567                                         Client_ID(Origin), Channel_Name(Channel));
 568                                 goto chan_exit;
 569                         }
 570                 case 'i': /* Invite only */
 571                 case 'V': /* Invite disallow */
 572                 case 'M': /* Only identified nicks can write */
 573                 case 'm': /* Moderated */
 574                 case 'n': /* Only members can write */
 575                 case 'Q': /* No kicks */
 576                 case 't': /* Topic locked */
 577                         if(is_oper || is_machine || is_owner ||
 578                            is_admin || is_op || is_halfop)
 579                                 x[0] = *mode_ptr;
 580                         else
 581                                 connected = IRC_WriteErrClient(Origin,
 582                                         ERR_CHANOPRIVSNEEDED_MSG,
 583                                         Client_ID(Origin), Channel_Name(Channel));
 584                         break;
 585                 case 'k': /* Channel key */
 586                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 587                                 goto chan_exit;
 588                         if (!set) {
 589                                 if (is_oper || is_machine || is_owner ||
 590                                     is_admin || is_op || is_halfop) {
 591                                         x[0] = *mode_ptr;
 592                                         if (Channel_HasMode(Channel, 'k'))
 593                                                 strlcpy(argadd, "*", sizeof(argadd));
 594                                         if (arg_arg > mode_arg)
 595                                                 arg_arg++;
 596                                 } else
 597                                         connected = IRC_WriteErrClient(Origin,
 598                                                 ERR_CHANOPRIVSNEEDED_MSG,
 599                                                 Client_ID(Origin),
 600                                                 Channel_Name(Channel));
 601                                 break;
 602                         }
 603                         if (arg_arg > mode_arg) {
 604                                 if (is_oper || is_machine || is_owner ||
 605                                     is_admin || is_op || is_halfop) {
 606                                         Channel_ModeDel(Channel, 'k');
 607                                         Channel_SetKey(Channel,
 608                                                        Req->argv[arg_arg]);
 609                                         strlcpy(argadd, Channel_Key(Channel),
 610                                                 sizeof(argadd));
 611                                         x[0] = *mode_ptr;
 612                                 } else {
 613                                         connected = IRC_WriteErrClient(Origin,
 614                                                 ERR_CHANOPRIVSNEEDED_MSG,
 615                                                 Client_ID(Origin),
 616                                                 Channel_Name(Channel));
 617                                 }
 618                                 Req->argv[arg_arg][0] = '\0';
 619                                 arg_arg++;
 620                         } else {
 621 #ifdef STRICT_RFC
 622                                 /* Only send error message in "strict" mode,
 623                                  * this is how ircd2.11 and others behave ... */
 624                                 connected = IRC_WriteErrClient(Origin,
 625                                         ERR_NEEDMOREPARAMS_MSG,
 626                                         Client_ID(Origin), Req->command);
 627 #endif
 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_WriteErrClient(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_WriteErrClient(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 #ifdef STRICT_RFC
 666                                 /* Only send error message in "strict" mode,
 667                                  * this is how ircd2.11 and others behave ... */
 668                                 connected = IRC_WriteErrClient(Origin,
 669                                         ERR_NEEDMOREPARAMS_MSG,
 670                                         Client_ID(Origin), Req->command);
 671 #endif
 672                                 goto chan_exit;
 673                         }
 674                         break;
 675                 case 'O': /* IRC operators only */
 676                         if (set) {
 677                                 /* Only IRC operators are allowed to
 678                                  * set the 'O' channel mode! */
 679                                 if(is_oper || is_machine)
 680                                         x[0] = 'O';
 681                                 else
 682                                         connected = IRC_WriteErrClient(Origin,
 683                                                 ERR_NOPRIVILEGES_MSG,
 684                                                 Client_ID(Origin));
 685                         } else if(is_oper || is_machine || is_owner ||
 686                                   is_admin || is_op)
 687                                 x[0] = 'O';
 688                         else
 689                                 connected = IRC_WriteErrClient(Origin,
 690                                         ERR_CHANOPRIVSNEEDED_MSG,
 691                                         Client_ID(Origin),
 692                                         Channel_Name(Channel));
 693                         break;
 694                 case 'P': /* Persistent channel */
 695                         if (set) {
 696                                 /* Only IRC operators are allowed to
 697                                  * set the 'P' channel mode! */
 698                                 if(is_oper || is_machine)
 699                                         x[0] = 'P';
 700                                 else
 701                                         connected = IRC_WriteErrClient(Origin,
 702                                                 ERR_NOPRIVILEGES_MSG,
 703                                                 Client_ID(Origin));
 704                         } else if(is_oper || is_machine || is_owner ||
 705                                   is_admin || is_op)
 706                                 x[0] = 'P';
 707                         else
 708                                 connected = IRC_WriteErrClient(Origin,
 709                                         ERR_CHANOPRIVSNEEDED_MSG,
 710                                         Client_ID(Origin),
 711                                         Channel_Name(Channel));
 712                         break;
 713                 /* --- Channel user modes --- */
 714                 case 'q': /* Owner */
 715                 case 'a': /* Channel admin */
 716                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 717                                 connected = IRC_WriteErrClient(Origin,
 718                                         ERR_CHANOPPRIVTOOLOW_MSG,
 719                                         Client_ID(Origin),
 720                                         Channel_Name(Channel));
 721                                 goto chan_exit;
 722                         }
 723                 case 'o': /* Channel operator */
 724                         if(!is_oper && !is_machine && !is_owner &&
 725                            !is_admin && !is_op) {
 726                                 connected = IRC_WriteErrClient(Origin,
 727                                         ERR_CHANOPRIVSNEEDED_MSG,
 728                                         Client_ID(Origin),
 729                                         Channel_Name(Channel));
 730                                 goto chan_exit;
 731                         }
 732                 case 'h': /* Half Op */
 733                         if(!is_oper && !is_machine && !is_owner &&
 734                            !is_admin && !is_op) {
 735                                 connected = IRC_WriteErrClient(Origin,
 736                                         ERR_CHANOPRIVSNEEDED_MSG,
 737                                         Client_ID(Origin),
 738                                         Channel_Name(Channel));
 739                                 goto chan_exit;
 740                         }
 741                 case 'v': /* Voice */
 742                         if (arg_arg > mode_arg) {
 743                                 if (is_oper || is_machine || is_owner ||
 744                                     is_admin || is_op || is_halfop) {
 745                                         client = Client_Search(Req->argv[arg_arg]);
 746                                         if (client)
 747                                                 x[0] = *mode_ptr;
 748                                         else
 749                                                 connected = IRC_WriteErrClient(Origin,
 750                                                         ERR_NOSUCHNICK_MSG,
 751                                                         Client_ID(Origin),
 752                                                         Req->argv[arg_arg]);
 753                                 } else {
 754                                         connected = IRC_WriteErrClient(Origin,
 755                                                 ERR_CHANOPRIVSNEEDED_MSG,
 756                                                 Client_ID(Origin),
 757                                                 Channel_Name(Channel));
 758                                 }
 759                                 Req->argv[arg_arg][0] = '\0';
 760                                 arg_arg++;
 761                         } else {
 762 #ifdef STRICT_RFC
 763                                 /* Report an error to the client, when a user
 764                                  * mode should be changed but no nickname is
 765                                  * given. But don't do it when not in "strict"
 766                                  * mode, because most other servers don't do
 767                                  * it as well and some clients send "wired"
 768                                  * MODE commands like "MODE #chan -ooo nick". */
 769                                 connected = IRC_WriteErrClient(Origin,
 770                                         ERR_NEEDMOREPARAMS_MSG,
 771                                         Client_ID(Origin), Req->command);
 772 #endif
 773                                 goto chan_exit;
 774                         }
 775                         break;
 776                 /* --- Channel lists --- */
 777                 case 'I': /* Invite lists */
 778                 case 'b': /* Ban lists */
 779                 case 'e': /* Channel exception lists */
 780                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 781                                 goto chan_exit;
 782                         if (arg_arg > mode_arg) {
 783                                 /* modify list */
 784                                 if (is_oper || is_machine || is_owner ||
 785                                     is_admin || is_op || is_halfop) {
 786                                         connected = set
 787                                            ? Add_To_List(*mode_ptr, Origin,
 788                                                 Client, Channel,
 789                                                 Req->argv[arg_arg])
 790                                            : Del_From_List(*mode_ptr, Origin,
 791                                                 Client, Channel,
 792                                                 Req->argv[arg_arg]);
 793                                 } else {
 794                                         connected = IRC_WriteErrClient(Origin,
 795                                                 ERR_CHANOPRIVSNEEDED_MSG,
 796                                                 Client_ID(Origin),
 797                                                 Channel_Name(Channel));
 798                                 }
 799                                 Req->argv[arg_arg][0] = '\0';
 800                                 arg_arg++;
 801                         } else {
 802                                 switch (*mode_ptr) {
 803                                 case 'I':
 804                                         Channel_ShowInvites(Origin, Channel);
 805                                         break;
 806                                 case 'b':
 807                                         Channel_ShowBans(Origin, Channel);
 808                                         break;
 809                                 case 'e':
 810                                         Channel_ShowExcepts(Origin, Channel);
 811                                         break;
 812                                 }
 813                         }
 814                         break;
 815                 default:
 816                         if (Client_Type(Client) != CLIENT_SERVER) {
 817                                 Log(LOG_DEBUG,
 818                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 819                                     set ? '+' : '-', *mode_ptr,
 820                                     Client_ID(Origin), Channel_Name(Channel));
 821                                 connected = IRC_WriteErrClient(Origin,
 822                                         ERR_UNKNOWNMODE_MSG,
 823                                         Client_ID(Origin), *mode_ptr,
 824                                         Channel_Name(Channel));
 825                                 x[0] = '\0';
 826                         } else {
 827                                 Log(LOG_DEBUG,
 828                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 829                                     set ? '+' : '-', *mode_ptr,
 830                                     Client_ID(Origin), Channel_Name(Channel));
 831                                 x[0] = *mode_ptr;
 832                         }
 833                 }
 834
 835                 if (!connected)
 836                         break;
 837
 838                 /* Is there a valid mode change? */
 839                 if (!x[0])
 840                         continue;
 841
 842                 /* Validate target client */
 843                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 844                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 845                                                 Client_ID(Origin),
 846                                                 Client_ID(client),
 847                                                 Channel_Name(Channel)))
 848                                 break;
 849                         continue;
 850                 }
 851
 852                 if (client) {
 853                         /* Channel-User-Mode */
 854                         retval = set
 855                                ? Channel_UserModeAdd(Channel, client, x[0])
 856                                : Channel_UserModeDel(Channel, client, x[0]);
 857                         if (retval) {
 858                                 strlcat(the_args, " ", sizeof(the_args));
 859                                 strlcat(the_args, Client_ID(client),
 860                                         sizeof(the_args));
 861                                 strlcat(the_modes, x, sizeof(the_modes));
 862                                 LogDebug
 863                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 864                                      Client_Mask(client), Channel_Name(Channel),
 865                                      Channel_UserModes(Channel, client));
 866                         }
 867                 } else {
 868                         /* Channel-Mode */
 869                         retval = set
 870                                ? Channel_ModeAdd(Channel, x[0])
 871                                : Channel_ModeDel(Channel, x[0]);
 872                         if (retval) {
 873                                 strlcat(the_modes, x, sizeof(the_modes));
 874                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 875                                          Channel_Name(Channel),
 876                                          Channel_Modes(Channel));
 877                         }
 878                 }
 879
 880                 /* Are there additional arguments to add? */
 881                 if (argadd[0]) {
 882                         strlcat(the_args, " ", sizeof(the_args));
 883                         strlcat(the_args, argadd, sizeof(the_args));
 884                 }
 885         }
 886
 887       chan_exit:
 888         /* Are there changed modes? */
 889         if (the_modes[1]) {
 890                 /* Clean up mode string */
 891                 len = strlen(the_modes) - 1;
 892                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 893                         the_modes[len] = '\0';
 894
 895                 if (Client_Type(Client) == CLIENT_SERVER) {
 896                         /* MODE requests for local channels from other servers
 897                          * are definitely invalid! */
 898                         if (Channel_IsLocal(Channel)) {
 899                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 900                                 return CONNECTED;
 901                         }
 902
 903                         /* Forward mode changes to channel users and all the
 904                          * other remote servers: */
 905                         IRC_WriteStrServersPrefix(Client, Origin,
 906                                 "MODE %s %s%s", Channel_Name(Channel),
 907                                 the_modes, the_args);
 908                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 909                                 false, "MODE %s %s%s", Channel_Name(Channel),
 910                                 the_modes, the_args);
 911                 } else {
 912                         if (use_servermode)
 913                                 Origin = Client_ThisServer();
 914                         /* Send reply to client and inform other servers and channel users */
 915                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 916                                         "MODE %s %s%s", Channel_Name(Channel),
 917                                         the_modes, the_args);
 918                         /* Only forward requests for non-local channels */
 919                         if (!Channel_IsLocal(Channel))
 920                                 IRC_WriteStrServersPrefix(Client, Origin,
 921                                         "MODE %s %s%s", Channel_Name(Channel),
 922                                         the_modes, the_args);
 923                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 924                                 false, "MODE %s %s%s", Channel_Name(Channel),
 925                                 the_modes, the_args);
 926                 }
 927         }
 928
 929         return connected;
 930 } /* Channel_Mode */
 931
 932 /**
 933  * Handler for the IRC "AWAY" command.
 934  *
 935  * @param Client The client from which this command has been received.
 936  * @param Req Request structure with prefix and all parameters.
 937  * @return CONNECTED or DISCONNECTED.
 938  */
 939 GLOBAL bool
 940 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 941 {
 942         assert (Client != NULL);
 943         assert (Req != NULL);
 944
 945         if (Req->argc == 1 && Req->argv[0][0]) {
 946                 Client_SetAway(Client, Req->argv[0]);
 947                 Client_ModeAdd(Client, 'a');
 948                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 949                                           Client_ID( Client));
 950                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 951                                           Client_ID( Client));
 952         } else {
 953                 Client_ModeDel(Client, 'a');
 954                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 955                                           Client_ID( Client));
 956                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 957                                           Client_ID( Client));
 958         }
 959 } /* IRC_AWAY */
 960
 961 /**
 962  * Add entries to channel invite, ban and exception lists.
 963  *
 964  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 965  * @param Prefix The originator of the command.
 966  * @param Client The sender of the command.
 967  * @param Channel The channel of which the list should be modified.
 968  * @param Pattern The pattern to add to the list.
 969  * @return CONNECTED or DISCONNECTED.
 970  */
 971 static bool
 972 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 973             const char *Pattern)
 974 {
 975         char mask[MASK_LEN];
 976         struct list_head *list = NULL;
 977         long int current_count;
 978
 979         assert(Client != NULL);
 980         assert(Channel != NULL);
 981         assert(Pattern != NULL);
 982         assert(what == 'I' || what == 'b' || what == 'e');
 983
 984         Lists_MakeMask(Pattern, mask, sizeof(mask));
 985         current_count = Lists_Count(Channel_GetListInvites(Channel))
 986                         + Lists_Count(Channel_GetListExcepts(Channel))
 987                         + Lists_Count(Channel_GetListBans(Channel));
 988
 989         switch(what) {
 990                 case 'I':
 991                         list = Channel_GetListInvites(Channel);
 992                         break;
 993                 case 'b':
 994                         list = Channel_GetListBans(Channel);
 995                         break;
 996                 case 'e':
 997                         list = Channel_GetListExcepts(Channel);
 998                         break;
 999         }
1000
1001         if (Lists_CheckDupeMask(list, mask))
1002                 return CONNECTED;
1003         if (Client_Type(Client) == CLIENT_USER &&
1004             current_count >= MAX_HNDL_CHANNEL_LISTS)
1005                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
1006                                           Client_ID(Client),
1007                                           Channel_Name(Channel), mask,
1008                                           MAX_HNDL_CHANNEL_LISTS);
1009
1010         switch (what) {
1011                 case 'I':
1012                         if (!Channel_AddInvite(Channel, mask, false))
1013                                 return CONNECTED;
1014                         break;
1015                 case 'b':
1016                         if (!Channel_AddBan(Channel, mask))
1017                                 return CONNECTED;
1018                         break;
1019                 case 'e':
1020                         if (!Channel_AddExcept(Channel, mask))
1021                                 return CONNECTED;
1022                         break;
1023         }
1024         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1025 }
1026
1027 /**
1028  * Delete entries from channel invite, ban and exception lists.
1029  *
1030  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1031  * @param Prefix The originator of the command.
1032  * @param Client The sender of the command.
1033  * @param Channel The channel of which the list should be modified.
1034  * @param Pattern The pattern to add to the list.
1035  * @return CONNECTED or DISCONNECTED.
1036  */
1037 static bool
1038 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1039               const char *Pattern)
1040 {
1041         char mask[MASK_LEN];
1042         struct list_head *list = NULL;
1043
1044         assert(Client != NULL);
1045         assert(Channel != NULL);
1046         assert(Pattern != NULL);
1047         assert(what == 'I' || what == 'b' || what == 'e');
1048
1049         Lists_MakeMask(Pattern, mask, sizeof(mask));
1050
1051         switch (what) {
1052                 case 'I':
1053                         list = Channel_GetListInvites(Channel);
1054                         break;
1055                 case 'b':
1056                         list = Channel_GetListBans(Channel);
1057                         break;
1058                 case 'e':
1059                         list = Channel_GetListExcepts(Channel);
1060                         break;
1061         }
1062
1063         if (!Lists_CheckDupeMask(list, mask))
1064                 return CONNECTED;
1065         Lists_Del(list, mask);
1066
1067         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1068 }
1069
1070 /**
1071  * Send information about changed channel invite/ban/exception lists to clients.
1072  *
1073  * @param IsAdd true if the list item has been added, false otherwise.
1074  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1075  * @param Prefix The originator of the mode list change.
1076  * @param Client The sender of the command.
1077  * @param Channel The channel of which the list has been modified.
1078  * @param Mask The mask which has been added or removed.
1079  * @return CONNECTED or DISCONNECTED.
1080  */
1081 static bool
1082 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1083                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1084 {
1085         bool ok = true;
1086
1087         /* Send confirmation to the client */
1088         if (Client_Type(Client) == CLIENT_USER)
1089                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1090                                               Channel_Name(Channel),
1091                                               IsAdd ? '+' : '-',
1092                                               ModeChar, Mask);
1093
1094         /* to other servers */
1095         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1096                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1097                                   ModeChar, Mask);
1098
1099         /* and local users in channel */
1100         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1101                                   "MODE %s %c%c %s", Channel_Name(Channel),
1102                                   IsAdd ? '+' : '-', ModeChar, Mask );
1103
1104         return ok;
1105 } /* Send_ListChange */
1106
1107 /* -eof- */