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         /* Channel or user mode? */
  72         cl = NULL; chan = NULL;
  73         if (Client_IsValidNick(Req->argv[0]))
  74                 cl = Client_Search(Req->argv[0]);
  75         if (Channel_IsValidName(Req->argv[0]))
  76                 chan = Channel_Search(Req->argv[0]);
  77
  78         if (cl)
  79                 return Client_Mode(Client, Req, origin, cl);
  80         if (chan)
  81                 return Channel_Mode(Client, Req, origin, chan);
  82
  83         /* No target found! */
  84         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
  85                         Client_ID(Client), Req->argv[0]);
  86 } /* IRC_MODE */
  87
  88 /**
  89  * Check if the "mode limit" for a client has been reached.
  90  *
  91  * This limit doesn't apply for servers or services!
  92  *
  93  * @param Client The client to check.
  94  * @param Count The number of modes already handled.
  95  * @return true if the limit has been reached.
  96  */
  97 static bool
  98 Mode_Limit_Reached(CLIENT *Client, int Count)
  99 {
 100         if (Client_Type(Client) == CLIENT_SERVER
 101             || Client_Type(Client) == CLIENT_SERVICE)
 102                 return false;
 103         if (Count < MAX_HNDL_MODES_ARG)
 104                 return false;
 105         return true;
 106 }
 107
 108 /**
 109  * Handle client mode requests
 110  *
 111  * @param Client The client from which this command has been received.
 112  * @param Req Request structure with prefix and all parameters.
 113  * @param Origin The originator of the MODE command (prefix).
 114  * @param Target The target (client) of this MODE command.
 115  * @return CONNECTED or DISCONNECTED.
 116  */
 117 static bool
 118 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 119 {
 120         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 121         bool ok, set;
 122         bool send_RPL_HOSTHIDDEN_MSG = false;
 123         int mode_arg;
 124         size_t len;
 125
 126         /* Is the client allowed to request or change the modes? */
 127         if (Client_Type(Client) == CLIENT_USER) {
 128                 /* Users are only allowed to manipulate their own modes! */
 129                 if (Target != Client)
 130                         return IRC_WriteErrClient(Client,
 131                                                   ERR_USERSDONTMATCH_MSG,
 132                                                   Client_ID(Client));
 133         }
 134
 135         /* Mode request: let's answer it :-) */
 136         if (Req->argc == 1)
 137                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 138                                           Client_ID(Target),
 139                                           Client_Modes(Target));
 140
 141         mode_arg = 1;
 142         mode_ptr = Req->argv[mode_arg];
 143
 144         /* Initial state: set or unset modes? */
 145         if (*mode_ptr == '+') {
 146                 set = true;
 147                 strcpy(the_modes, "+");
 148         } else if (*mode_ptr == '-') {
 149                 set = false;
 150                 strcpy(the_modes, "-");
 151         } else
 152                 return IRC_WriteErrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 153                                           Client_ID(Origin));
 154
 155         x[1] = '\0';
 156         ok = CONNECTED;
 157         while (mode_ptr) {
 158                 mode_ptr++;
 159                 if (!*mode_ptr) {
 160                         /* Try next argument if there's any */
 161                         mode_arg++;
 162                         if (mode_arg < Req->argc)
 163                                 mode_ptr = Req->argv[mode_arg];
 164                         else
 165                                 break;
 166                 }
 167
 168                 switch(*mode_ptr) {
 169                   case '+':
 170                   case '-':
 171                         if ((*mode_ptr == '+' && !set)
 172                             || (*mode_ptr == '-' && set)) {
 173                                 /* Action modifier ("+"/"-") must be changed */
 174                                 len = strlen(the_modes) - 1;
 175                                 if (the_modes[len] == '+'
 176                                     || the_modes[len] == '-') {
 177                                         /* Last character in the "result
 178                                          * string" was an "action", so just
 179                                          * overwrite it with the new action */
 180                                         the_modes[len] = *mode_ptr;
 181                                 } else {
 182                                         /* Append new modifier character to
 183                                          * the resulting mode string */
 184                                         x[0] = *mode_ptr;
 185                                         strlcat(the_modes, x,
 186                                                 sizeof(the_modes));
 187                                 }
 188                                 if (*mode_ptr == '+')
 189                                         set = true;
 190                                 else
 191                                         set = false;
 192                         }
 193                         continue;
 194                 }
 195
 196                 /* Validate modes */
 197                 x[0] = '\0';
 198                 switch (*mode_ptr) {
 199                 case 'b': /* Block private msgs */
 200                 case 'C': /* Only messages from clients sharing a channel */
 201                 case 'i': /* Invisible */
 202                 case 's': /* Server messages */
 203                 case 'w': /* Wallops messages */
 204                         x[0] = *mode_ptr;
 205                         break;
 206                 case 'a': /* Away */
 207                         if (Client_Type(Client) == CLIENT_SERVER) {
 208                                 x[0] = 'a';
 209                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 210                         } else
 211                                 ok = IRC_WriteErrClient(Origin,
 212                                                         ERR_NOPRIVILEGES_MSG,
 213                                                         Client_ID(Origin));
 214                         break;
 215                 case 'B': /* Bot */
 216                         if (Client_HasMode(Client, 'r'))
 217                                 ok = IRC_WriteErrClient(Origin,
 218                                                         ERR_RESTRICTED_MSG,
 219                                                         Client_ID(Origin));
 220                         else
 221                                 x[0] = 'B';
 222                         break;
 223                 case 'c': /* Receive connect notices */
 224                 case 'q': /* KICK-protected user */
 225                 case 'F': /* disable flood protection */
 226                           /* (only settable by IRC operators!) */
 227                         if (!set || Client_Type(Client) == CLIENT_SERVER
 228                             || Client_HasMode(Origin, 'o'))
 229                                 x[0] = *mode_ptr;
 230                         else
 231                                 ok = IRC_WriteErrClient(Origin,
 232                                                         ERR_NOPRIVILEGES_MSG,
 233                                                         Client_ID(Origin));
 234                         break;
 235                 case 'o': /* IRC operator (only unsettable!) */
 236                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 237                                 x[0] = 'o';
 238                         } else
 239                                 ok = IRC_WriteErrClient(Origin,
 240                                                         ERR_NOPRIVILEGES_MSG,
 241                                                         Client_ID(Origin));
 242                         break;
 243                 case 'r': /* Restricted (only settable) */
 244                         if (set || Client_Type(Client) == CLIENT_SERVER)
 245                                 x[0] = 'r';
 246                         else
 247                                 ok = IRC_WriteErrClient(Origin,
 248                                                         ERR_RESTRICTED_MSG,
 249                                                         Client_ID(Origin));
 250                         break;
 251                 case 'R': /* Registered (not [un]settable by clients) */
 252                         if (Client_Type(Client) == CLIENT_SERVER)
 253                                 x[0] = 'R';
 254                         else
 255                                 ok = IRC_WriteErrClient(Origin,
 256                                                         ERR_NICKREGISTER_MSG,
 257                                                         Client_ID(Origin));
 258                         break;
 259                 case 'x': /* Cloak hostname */
 260                         if (Client_HasMode(Client, 'r'))
 261                                 ok = IRC_WriteErrClient(Origin,
 262                                                         ERR_RESTRICTED_MSG,
 263                                                         Client_ID(Origin));
 264                         else if (!set || Conf_CloakHostModeX[0]
 265                                  || Client_Type(Client) == CLIENT_SERVER
 266                                  || Client_HasMode(Origin, 'o')) {
 267                                 x[0] = 'x';
 268                                 send_RPL_HOSTHIDDEN_MSG = true;
 269                         } else
 270                                 ok = IRC_WriteErrClient(Origin,
 271                                                         ERR_NOPRIVILEGES_MSG,
 272                                                         Client_ID(Origin));
 273                         break;
 274                 default:
 275                         if (Client_Type(Client) != CLIENT_SERVER) {
 276                                 Log(LOG_DEBUG,
 277                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 278                                     set ? '+' : '-', *mode_ptr,
 279                                     Client_ID(Origin));
 280                                 ok = IRC_WriteErrClient(Origin,
 281                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 282                                                         Client_ID(Origin),
 283                                                         set ? '+' : '-',
 284                                                         *mode_ptr);
 285                                 x[0] = '\0';
 286                         } else {
 287                                 Log(LOG_DEBUG,
 288                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 289                                     set ? '+' : '-', *mode_ptr,
 290                                     Client_ID(Origin), Client_ID(Target));
 291                                 x[0] = *mode_ptr;
 292                         }
 293                 }
 294
 295                 if (!ok)
 296                         break;
 297
 298                 /* Is there a valid mode change? */
 299                 if (!x[0])
 300                         continue;
 301
 302                 if (set) {
 303                         if (Client_ModeAdd(Target, x[0]))
 304                                 strlcat(the_modes, x, sizeof(the_modes));
 305                 } else {
 306                         if (Client_ModeDel(Target, x[0]))
 307                                 strlcat(the_modes, x, sizeof(the_modes));
 308                 }
 309         }
 310
 311         /* Are there changed modes? */
 312         if (the_modes[1]) {
 313                 /* Remove needless action modifier characters */
 314                 len = strlen(the_modes) - 1;
 315                 if (the_modes[len] == '+' || the_modes[len] == '-')
 316                         the_modes[len] = '\0';
 317
 318                 if (Client_Type(Client) == CLIENT_SERVER) {
 319                         /* Forward modes to other servers */
 320                         if (Client_Conn(Target) != NONE) {
 321                                 /* Remote server (service?) changed modes
 322                                  * for one of our clients. Inform it! */
 323                                 IRC_WriteStrClientPrefix(Target, Origin,
 324                                                          "MODE %s :%s",
 325                                                          Client_ID(Target),
 326                                                          the_modes);
 327                         }
 328                         IRC_WriteStrServersPrefix(Client, Origin,
 329                                                   "MODE %s :%s",
 330                                                   Client_ID(Target),
 331                                                   the_modes);
 332                 } else {
 333                         /* Send reply to client and inform other servers */
 334                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 335                                                       "MODE %s :%s",
 336                                                       Client_ID(Target),
 337                                                       the_modes);
 338                         IRC_WriteStrServersPrefix(Client, Origin,
 339                                                   "MODE %s :%s",
 340                                                   Client_ID(Target),
 341                                                   the_modes);
 342                 }
 343
 344                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 345                         /* A new (cloaked) hostname must be announced */
 346                         IRC_WriteStrClientPrefix(Target, Origin,
 347                                                  RPL_HOSTHIDDEN_MSG,
 348                                                  Client_ID(Target),
 349                                                  Client_HostnameDisplayed(Target));
 350
 351                 }
 352
 353                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 354                          Client_TypeText(Target), Client_Mask(Target),
 355                          Client_Modes(Target));
 356         }
 357
 358         return ok;
 359 } /* Client_Mode */
 360
 361 /*
 362  * Reply to a channel mode request.
 363  *
 364  * @param Origin The originator of the MODE command (prefix).
 365  * @param Channel The channel of which the modes should be sent.
 366  * @return CONNECTED or DISCONNECTED.
 367  */
 368 static bool
 369 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 370 {
 371         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 372         const char *mode_ptr;
 373
 374         /* Member or not? -- That's the question! */
 375         if (!Channel_IsMemberOf(Channel, Origin))
 376                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 377                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 378
 379         /* The sender is a member: generate extended reply */
 380         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 381         mode_ptr = the_modes;
 382         the_args[0] = '\0';
 383
 384         while(*mode_ptr) {
 385                 switch(*mode_ptr) {
 386                 case 'l':
 387                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 388                         strlcat(the_args, argadd, sizeof(the_args));
 389                         break;
 390                 case 'k':
 391                         strlcat(the_args, " ", sizeof(the_args));
 392                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 393                         break;
 394                 }
 395                 mode_ptr++;
 396         }
 397         if (the_args[0])
 398                 strlcat(the_modes, the_args, sizeof(the_modes));
 399
 400         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 401                                 Client_ID(Origin), Channel_Name(Channel),
 402                                 the_modes))
 403                 return DISCONNECTED;
 404 #ifndef STRICT_RFC
 405         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 406                                   Client_ID(Origin), Channel_Name(Channel),
 407                                   Channel_CreationTime(Channel)))
 408                 return DISCONNECTED;
 409 #endif
 410         return CONNECTED;
 411 }
 412
 413 /**
 414  * Handle channel mode and channel-user mode changes
 415  *
 416  * @param Client The client from which this command has been received.
 417  * @param Req Request structure with prefix and all parameters.
 418  * @param Origin The originator of the MODE command (prefix).
 419  * @param Channel The target channel of this MODE command.
 420  * @return CONNECTED or DISCONNECTED.
 421  */
 422 static bool
 423 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 424 {
 425         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 426             argadd[CLIENT_PASS_LEN], *mode_ptr;
 427         bool connected, set, skiponce, retval, use_servermode,
 428              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 429         int mode_arg, arg_arg, mode_arg_count = 0;
 430         CLIENT *client;
 431         long l;
 432         size_t len;
 433
 434         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 435
 436         if (Channel_IsModeless(Channel))
 437                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 438                                 Client_ID(Client), Channel_Name(Channel));
 439
 440         /* Mode request: let's answer it :-) */
 441         if (Req->argc <= 1)
 442                 return Channel_Mode_Answer_Request(Origin, Channel);
 443
 444         /* Check if origin is oper and opers can use mode */
 445         use_servermode = Conf_OperServerMode;
 446         if(Client_HasMode(Client, 'o') && Conf_OperCanMode) {
 447                 is_oper = true;
 448         }
 449
 450         /* Check if client is a server/service */
 451         if(Client_Type(Client) == CLIENT_SERVER ||
 452            Client_Type(Client) == CLIENT_SERVICE) {
 453                 is_machine = true;
 454         }
 455
 456         /* Check if client is member of channel or an oper or an server/service */
 457         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 458                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 459                                           Client_ID(Origin),
 460                                           Channel_Name(Channel));
 461
 462         mode_arg = 1;
 463         mode_ptr = Req->argv[mode_arg];
 464         if (Req->argc > mode_arg + 1)
 465                 arg_arg = mode_arg + 1;
 466         else
 467                 arg_arg = -1;
 468
 469         /* Initial state: set or unset modes? */
 470         skiponce = false;
 471         switch (*mode_ptr) {
 472         case '-':
 473                 set = false;
 474                 break;
 475         case '+':
 476                 set = true;
 477                 break;
 478         default:
 479                 set = true;
 480                 skiponce = true;
 481         }
 482
 483         /* Prepare reply string */
 484         strcpy(the_modes, set ? "+" : "-");
 485         the_args[0] = '\0';
 486
 487         x[1] = '\0';
 488         connected = CONNECTED;
 489         while (mode_ptr) {
 490                 if (!skiponce)
 491                         mode_ptr++;
 492                 if (!*mode_ptr) {
 493                         /* Try next argument if there's any */
 494                         if (arg_arg < 0)
 495                                 break;
 496                         if (arg_arg > mode_arg)
 497                                 mode_arg = arg_arg;
 498                         else
 499                                 mode_arg++;
 500
 501                         if (mode_arg >= Req->argc)
 502                                 break;
 503                         mode_ptr = Req->argv[mode_arg];
 504
 505                         if (Req->argc > mode_arg + 1)
 506                                 arg_arg = mode_arg + 1;
 507                         else
 508                                 arg_arg = -1;
 509                 }
 510                 skiponce = false;
 511
 512                 switch (*mode_ptr) {
 513                 case '+':
 514                 case '-':
 515                         if (((*mode_ptr == '+') && !set)
 516                             || ((*mode_ptr == '-') && set)) {
 517                                 /* Action modifier ("+"/"-") must be changed ... */
 518                                 len = strlen(the_modes) - 1;
 519                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 520                                         /* Adjust last action modifier in result */
 521                                         the_modes[len] = *mode_ptr;
 522                                 } else {
 523                                         /* Append modifier character to result string */
 524                                         x[0] = *mode_ptr;
 525                                         strlcat(the_modes, x, sizeof(the_modes));
 526                                 }
 527                                 set = *mode_ptr == '+';
 528                         }
 529                         continue;
 530                 }
 531
 532                 /* Are there arguments left? */
 533                 if (arg_arg >= Req->argc)
 534                         arg_arg = -1;
 535
 536                 if(!is_machine && !is_oper) {
 537                         if (Channel_UserHasMode(Channel, Client, 'q'))
 538                                 is_owner = true;
 539                         if (Channel_UserHasMode(Channel, Client, 'a'))
 540                                 is_admin = true;
 541                         if (Channel_UserHasMode(Channel, Client, 'o'))
 542                                 is_op = true;
 543                         if (Channel_UserHasMode(Channel, Client, 'h'))
 544                                 is_halfop = true;
 545                 }
 546
 547                 /* Validate modes */
 548                 x[0] = '\0';
 549                 argadd[0] = '\0';
 550                 client = NULL;
 551                 switch (*mode_ptr) {
 552                 /* --- Channel modes --- */
 553                 case 'R': /* Registered users only */
 554                 case 's': /* Secret channel */
 555                 case 'z': /* Secure connections only */
 556                         if(!is_oper && !is_machine && !is_owner &&
 557                            !is_admin && !is_op) {
 558                                 connected = IRC_WriteErrClient(Origin,
 559                                         ERR_CHANOPRIVSNEEDED_MSG,
 560                                         Client_ID(Origin), Channel_Name(Channel));
 561                                 goto chan_exit;
 562                         }
 563                 case 'i': /* Invite only */
 564                 case 'V': /* Invite disallow */
 565                 case 'M': /* Only identified nicks can write */
 566                 case 'm': /* Moderated */
 567                 case 'n': /* Only members can write */
 568                 case 'Q': /* No kicks */
 569                 case 't': /* Topic locked */
 570                         if(is_oper || is_machine || is_owner ||
 571                            is_admin || is_op || is_halfop)
 572                                 x[0] = *mode_ptr;
 573                         else
 574                                 connected = IRC_WriteErrClient(Origin,
 575                                         ERR_CHANOPRIVSNEEDED_MSG,
 576                                         Client_ID(Origin), Channel_Name(Channel));
 577                         break;
 578                 case 'k': /* Channel key */
 579                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 580                                 goto chan_exit;
 581                         if (!set) {
 582                                 if (is_oper || is_machine || is_owner ||
 583                                     is_admin || is_op || is_halfop) {
 584                                         x[0] = *mode_ptr;
 585                                         if (Channel_HasMode(Channel, 'k'))
 586                                                 strlcpy(argadd, "*", sizeof(argadd));
 587                                         if (arg_arg > mode_arg)
 588                                                 arg_arg++;
 589                                 } else
 590                                         connected = IRC_WriteErrClient(Origin,
 591                                                 ERR_CHANOPRIVSNEEDED_MSG,
 592                                                 Client_ID(Origin),
 593                                                 Channel_Name(Channel));
 594                                 break;
 595                         }
 596                         if (arg_arg > mode_arg) {
 597                                 if (is_oper || is_machine || is_owner ||
 598                                     is_admin || is_op || is_halfop) {
 599                                         Channel_ModeDel(Channel, 'k');
 600                                         Channel_SetKey(Channel,
 601                                                        Req->argv[arg_arg]);
 602                                         strlcpy(argadd, Channel_Key(Channel),
 603                                                 sizeof(argadd));
 604                                         x[0] = *mode_ptr;
 605                                 } else {
 606                                         connected = IRC_WriteErrClient(Origin,
 607                                                 ERR_CHANOPRIVSNEEDED_MSG,
 608                                                 Client_ID(Origin),
 609                                                 Channel_Name(Channel));
 610                                 }
 611                                 Req->argv[arg_arg][0] = '\0';
 612                                 arg_arg++;
 613                         } else {
 614 #ifdef STRICT_RFC
 615                                 /* Only send error message in "strict" mode,
 616                                  * this is how ircd2.11 and others behave ... */
 617                                 connected = IRC_WriteErrClient(Origin,
 618                                         ERR_NEEDMOREPARAMS_MSG,
 619                                         Client_ID(Origin), Req->command);
 620 #endif
 621                                 goto chan_exit;
 622                         }
 623                         break;
 624                 case 'l': /* Member limit */
 625                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 626                                 goto chan_exit;
 627                         if (!set) {
 628                                 if (is_oper || is_machine || is_owner ||
 629                                     is_admin || is_op || is_halfop)
 630                                         x[0] = *mode_ptr;
 631                                 else
 632                                         connected = IRC_WriteErrClient(Origin,
 633                                                 ERR_CHANOPRIVSNEEDED_MSG,
 634                                                 Client_ID(Origin),
 635                                                 Channel_Name(Channel));
 636                                 break;
 637                         }
 638                         if (arg_arg > mode_arg) {
 639                                 if (is_oper || is_machine || is_owner ||
 640                                     is_admin || is_op || is_halfop) {
 641                                         l = atol(Req->argv[arg_arg]);
 642                                         if (l > 0 && l < 0xFFFF) {
 643                                                 Channel_ModeDel(Channel, 'l');
 644                                                 Channel_SetMaxUsers(Channel, l);
 645                                                 snprintf(argadd, sizeof(argadd),
 646                                                          "%ld", l);
 647                                                 x[0] = *mode_ptr;
 648                                         }
 649                                 } else {
 650                                         connected = IRC_WriteErrClient(Origin,
 651                                                 ERR_CHANOPRIVSNEEDED_MSG,
 652                                                 Client_ID(Origin),
 653                                                 Channel_Name(Channel));
 654                                 }
 655                                 Req->argv[arg_arg][0] = '\0';
 656                                 arg_arg++;
 657                         } else {
 658 #ifdef STRICT_RFC
 659                                 /* Only send error message in "strict" mode,
 660                                  * this is how ircd2.11 and others behave ... */
 661                                 connected = IRC_WriteErrClient(Origin,
 662                                         ERR_NEEDMOREPARAMS_MSG,
 663                                         Client_ID(Origin), Req->command);
 664 #endif
 665                                 goto chan_exit;
 666                         }
 667                         break;
 668                 case 'O': /* IRC operators only */
 669                         if (set) {
 670                                 /* Only IRC operators are allowed to
 671                                  * set the 'O' channel mode! */
 672                                 if(is_oper || is_machine)
 673                                         x[0] = 'O';
 674                                 else
 675                                         connected = IRC_WriteErrClient(Origin,
 676                                                 ERR_NOPRIVILEGES_MSG,
 677                                                 Client_ID(Origin));
 678                         } else if(is_oper || is_machine || is_owner ||
 679                                   is_admin || is_op)
 680                                 x[0] = 'O';
 681                         else
 682                                 connected = IRC_WriteErrClient(Origin,
 683                                         ERR_CHANOPRIVSNEEDED_MSG,
 684                                         Client_ID(Origin),
 685                                         Channel_Name(Channel));
 686                         break;
 687                 case 'P': /* Persistent channel */
 688                         if (set) {
 689                                 /* Only IRC operators are allowed to
 690                                  * set the 'P' channel mode! */
 691                                 if(is_oper || is_machine)
 692                                         x[0] = 'P';
 693                                 else
 694                                         connected = IRC_WriteErrClient(Origin,
 695                                                 ERR_NOPRIVILEGES_MSG,
 696                                                 Client_ID(Origin));
 697                         } else if(is_oper || is_machine || is_owner ||
 698                                   is_admin || is_op)
 699                                 x[0] = 'P';
 700                         else
 701                                 connected = IRC_WriteErrClient(Origin,
 702                                         ERR_CHANOPRIVSNEEDED_MSG,
 703                                         Client_ID(Origin),
 704                                         Channel_Name(Channel));
 705                         break;
 706                 /* --- Channel user modes --- */
 707                 case 'q': /* Owner */
 708                 case 'a': /* Channel admin */
 709                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 710                                 connected = IRC_WriteErrClient(Origin,
 711                                         ERR_CHANOPPRIVTOOLOW_MSG,
 712                                         Client_ID(Origin),
 713                                         Channel_Name(Channel));
 714                                 goto chan_exit;
 715                         }
 716                 case 'o': /* Channel operator */
 717                         if(!is_oper && !is_machine && !is_owner &&
 718                            !is_admin && !is_op) {
 719                                 connected = IRC_WriteErrClient(Origin,
 720                                         ERR_CHANOPRIVSNEEDED_MSG,
 721                                         Client_ID(Origin),
 722                                         Channel_Name(Channel));
 723                                 goto chan_exit;
 724                         }
 725                 case 'h': /* Half Op */
 726                         if(!is_oper && !is_machine && !is_owner &&
 727                            !is_admin && !is_op) {
 728                                 connected = IRC_WriteErrClient(Origin,
 729                                         ERR_CHANOPRIVSNEEDED_MSG,
 730                                         Client_ID(Origin),
 731                                         Channel_Name(Channel));
 732                                 goto chan_exit;
 733                         }
 734                 case 'v': /* Voice */
 735                         if (arg_arg > mode_arg) {
 736                                 if (is_oper || is_machine || is_owner ||
 737                                     is_admin || is_op || is_halfop) {
 738                                         client = Client_Search(Req->argv[arg_arg]);
 739                                         if (client)
 740                                                 x[0] = *mode_ptr;
 741                                         else
 742                                                 connected = IRC_WriteErrClient(Origin,
 743                                                         ERR_NOSUCHNICK_MSG,
 744                                                         Client_ID(Origin),
 745                                                         Req->argv[arg_arg]);
 746                                 } else {
 747                                         connected = IRC_WriteErrClient(Origin,
 748                                                 ERR_CHANOPRIVSNEEDED_MSG,
 749                                                 Client_ID(Origin),
 750                                                 Channel_Name(Channel));
 751                                 }
 752                                 Req->argv[arg_arg][0] = '\0';
 753                                 arg_arg++;
 754                         } else {
 755 #ifdef STRICT_RFC
 756                                 /* Report an error to the client, when a user
 757                                  * mode should be changed but no nickname is
 758                                  * given. But don't do it when not in "strict"
 759                                  * mode, because most other servers don't do
 760                                  * it as well and some clients send "wired"
 761                                  * MODE commands like "MODE #chan -ooo nick". */
 762                                 connected = IRC_WriteErrClient(Origin,
 763                                         ERR_NEEDMOREPARAMS_MSG,
 764                                         Client_ID(Origin), Req->command);
 765 #endif
 766                                 goto chan_exit;
 767                         }
 768                         break;
 769                 /* --- Channel lists --- */
 770                 case 'I': /* Invite lists */
 771                 case 'b': /* Ban lists */
 772                 case 'e': /* Channel exception lists */
 773                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 774                                 goto chan_exit;
 775                         if (arg_arg > mode_arg) {
 776                                 /* modify list */
 777                                 if (is_oper || is_machine || is_owner ||
 778                                     is_admin || is_op || is_halfop) {
 779                                         connected = set
 780                                            ? Add_To_List(*mode_ptr, Origin,
 781                                                 Client, Channel,
 782                                                 Req->argv[arg_arg])
 783                                            : Del_From_List(*mode_ptr, Origin,
 784                                                 Client, Channel,
 785                                                 Req->argv[arg_arg]);
 786                                 } else {
 787                                         connected = IRC_WriteErrClient(Origin,
 788                                                 ERR_CHANOPRIVSNEEDED_MSG,
 789                                                 Client_ID(Origin),
 790                                                 Channel_Name(Channel));
 791                                 }
 792                                 Req->argv[arg_arg][0] = '\0';
 793                                 arg_arg++;
 794                         } else {
 795                                 switch (*mode_ptr) {
 796                                 case 'I':
 797                                         Channel_ShowInvites(Origin, Channel);
 798                                         break;
 799                                 case 'b':
 800                                         Channel_ShowBans(Origin, Channel);
 801                                         break;
 802                                 case 'e':
 803                                         Channel_ShowExcepts(Origin, Channel);
 804                                         break;
 805                                 }
 806                         }
 807                         break;
 808                 default:
 809                         if (Client_Type(Client) != CLIENT_SERVER) {
 810                                 Log(LOG_DEBUG,
 811                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 812                                     set ? '+' : '-', *mode_ptr,
 813                                     Client_ID(Origin), Channel_Name(Channel));
 814                                 connected = IRC_WriteErrClient(Origin,
 815                                         ERR_UNKNOWNMODE_MSG,
 816                                         Client_ID(Origin), *mode_ptr,
 817                                         Channel_Name(Channel));
 818                                 x[0] = '\0';
 819                         } else {
 820                                 Log(LOG_DEBUG,
 821                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 822                                     set ? '+' : '-', *mode_ptr,
 823                                     Client_ID(Origin), Channel_Name(Channel));
 824                                 x[0] = *mode_ptr;
 825                         }
 826                 }
 827
 828                 if (!connected)
 829                         break;
 830
 831                 /* Is there a valid mode change? */
 832                 if (!x[0])
 833                         continue;
 834
 835                 /* Validate target client */
 836                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 837                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 838                                                 Client_ID(Origin),
 839                                                 Client_ID(client),
 840                                                 Channel_Name(Channel)))
 841                                 break;
 842                         continue;
 843                 }
 844
 845                 if (client) {
 846                         /* Channel-User-Mode */
 847                         retval = set
 848                                ? Channel_UserModeAdd(Channel, client, x[0])
 849                                : Channel_UserModeDel(Channel, client, x[0]);
 850                         if (retval) {
 851                                 strlcat(the_args, " ", sizeof(the_args));
 852                                 strlcat(the_args, Client_ID(client),
 853                                         sizeof(the_args));
 854                                 strlcat(the_modes, x, sizeof(the_modes));
 855                                 LogDebug
 856                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 857                                      Client_Mask(client), Channel_Name(Channel),
 858                                      Channel_UserModes(Channel, client));
 859                         }
 860                 } else {
 861                         /* Channel-Mode */
 862                         retval = set
 863                                ? Channel_ModeAdd(Channel, x[0])
 864                                : Channel_ModeDel(Channel, x[0]);
 865                         if (retval) {
 866                                 strlcat(the_modes, x, sizeof(the_modes));
 867                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 868                                          Channel_Name(Channel),
 869                                          Channel_Modes(Channel));
 870                         }
 871                 }
 872
 873                 /* Are there additional arguments to add? */
 874                 if (argadd[0]) {
 875                         strlcat(the_args, " ", sizeof(the_args));
 876                         strlcat(the_args, argadd, sizeof(the_args));
 877                 }
 878         }
 879
 880       chan_exit:
 881         /* Are there changed modes? */
 882         if (the_modes[1]) {
 883                 /* Clean up mode string */
 884                 len = strlen(the_modes) - 1;
 885                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 886                         the_modes[len] = '\0';
 887
 888                 if (Client_Type(Client) == CLIENT_SERVER) {
 889                         /* MODE requests for local channels from other servers
 890                          * are definitely invalid! */
 891                         if (Channel_IsLocal(Channel)) {
 892                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 893                                 return CONNECTED;
 894                         }
 895
 896                         /* Forward mode changes to channel users and all the
 897                          * other remote servers: */
 898                         IRC_WriteStrServersPrefix(Client, Origin,
 899                                 "MODE %s %s%s", Channel_Name(Channel),
 900                                 the_modes, the_args);
 901                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 902                                 false, "MODE %s %s%s", Channel_Name(Channel),
 903                                 the_modes, the_args);
 904                 } else {
 905                         if (use_servermode)
 906                                 Origin = Client_ThisServer();
 907                         /* Send reply to client and inform other servers and channel users */
 908                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 909                                         "MODE %s %s%s", Channel_Name(Channel),
 910                                         the_modes, the_args);
 911                         /* Only forward requests for non-local channels */
 912                         if (!Channel_IsLocal(Channel))
 913                                 IRC_WriteStrServersPrefix(Client, Origin,
 914                                         "MODE %s %s%s", Channel_Name(Channel),
 915                                         the_modes, the_args);
 916                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 917                                 false, "MODE %s %s%s", Channel_Name(Channel),
 918                                 the_modes, the_args);
 919                 }
 920         }
 921
 922         return connected;
 923 } /* Channel_Mode */
 924
 925 /**
 926  * Handler for the IRC "AWAY" command.
 927  *
 928  * @param Client The client from which this command has been received.
 929  * @param Req Request structure with prefix and all parameters.
 930  * @return CONNECTED or DISCONNECTED.
 931  */
 932 GLOBAL bool
 933 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 934 {
 935         assert (Client != NULL);
 936         assert (Req != NULL);
 937
 938         if (Req->argc == 1 && Req->argv[0][0]) {
 939                 Client_SetAway(Client, Req->argv[0]);
 940                 Client_ModeAdd(Client, 'a');
 941                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 942                                           Client_ID( Client));
 943                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 944                                           Client_ID( Client));
 945         } else {
 946                 Client_ModeDel(Client, 'a');
 947                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 948                                           Client_ID( Client));
 949                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 950                                           Client_ID( Client));
 951         }
 952 } /* IRC_AWAY */
 953
 954 /**
 955  * Add entries to channel invite, ban and exception lists.
 956  *
 957  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 958  * @param Prefix The originator of the command.
 959  * @param Client The sender of the command.
 960  * @param Channel The channel of which the list should be modified.
 961  * @param Pattern The pattern to add to the list.
 962  * @return CONNECTED or DISCONNECTED.
 963  */
 964 static bool
 965 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 966             const char *Pattern)
 967 {
 968         char mask[MASK_LEN];
 969         struct list_head *list = NULL;
 970         long int current_count;
 971
 972         assert(Client != NULL);
 973         assert(Channel != NULL);
 974         assert(Pattern != NULL);
 975         assert(what == 'I' || what == 'b' || what == 'e');
 976
 977         Lists_MakeMask(Pattern, mask, sizeof(mask));
 978         current_count = Lists_Count(Channel_GetListInvites(Channel))
 979                         + Lists_Count(Channel_GetListExcepts(Channel))
 980                         + Lists_Count(Channel_GetListBans(Channel));
 981
 982         switch(what) {
 983                 case 'I':
 984                         list = Channel_GetListInvites(Channel);
 985                         break;
 986                 case 'b':
 987                         list = Channel_GetListBans(Channel);
 988                         break;
 989                 case 'e':
 990                         list = Channel_GetListExcepts(Channel);
 991                         break;
 992         }
 993
 994         if (Lists_CheckDupeMask(list, mask))
 995                 return CONNECTED;
 996         if (Client_Type(Client) == CLIENT_USER &&
 997             current_count >= MAX_HNDL_CHANNEL_LISTS)
 998                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
 999                                           Client_ID(Client),
1000                                           Channel_Name(Channel), mask,
1001                                           MAX_HNDL_CHANNEL_LISTS);
1002
1003         switch (what) {
1004                 case 'I':
1005                         if (!Channel_AddInvite(Channel, mask, false))
1006                                 return CONNECTED;
1007                         break;
1008                 case 'b':
1009                         if (!Channel_AddBan(Channel, mask))
1010                                 return CONNECTED;
1011                         break;
1012                 case 'e':
1013                         if (!Channel_AddExcept(Channel, mask))
1014                                 return CONNECTED;
1015                         break;
1016         }
1017         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1018 }
1019
1020 /**
1021  * Delete entries from channel invite, ban and exception lists.
1022  *
1023  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1024  * @param Prefix The originator of the command.
1025  * @param Client The sender of the command.
1026  * @param Channel The channel of which the list should be modified.
1027  * @param Pattern The pattern to add to the list.
1028  * @return CONNECTED or DISCONNECTED.
1029  */
1030 static bool
1031 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1032               const char *Pattern)
1033 {
1034         char mask[MASK_LEN];
1035         struct list_head *list = NULL;
1036
1037         assert(Client != NULL);
1038         assert(Channel != NULL);
1039         assert(Pattern != NULL);
1040         assert(what == 'I' || what == 'b' || what == 'e');
1041
1042         Lists_MakeMask(Pattern, mask, sizeof(mask));
1043
1044         switch (what) {
1045                 case 'I':
1046                         list = Channel_GetListInvites(Channel);
1047                         break;
1048                 case 'b':
1049                         list = Channel_GetListBans(Channel);
1050                         break;
1051                 case 'e':
1052                         list = Channel_GetListExcepts(Channel);
1053                         break;
1054         }
1055
1056         if (!Lists_CheckDupeMask(list, mask))
1057                 return CONNECTED;
1058         Lists_Del(list, mask);
1059
1060         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1061 }
1062
1063 /**
1064  * Send information about changed channel invite/ban/exception lists to clients.
1065  *
1066  * @param IsAdd true if the list item has been added, false otherwise.
1067  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1068  * @param Prefix The originator of the mode list change.
1069  * @param Client The sender of the command.
1070  * @param Channel The channel of which the list has been modified.
1071  * @param Mask The mask which has been added or removed.
1072  * @return CONNECTED or DISCONNECTED.
1073  */
1074 static bool
1075 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1076                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1077 {
1078         bool ok = true;
1079
1080         /* Send confirmation to the client */
1081         if (Client_Type(Client) == CLIENT_USER)
1082                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1083                                               Channel_Name(Channel),
1084                                               IsAdd ? '+' : '-',
1085                                               ModeChar, Mask);
1086
1087         /* to other servers */
1088         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1089                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1090                                   ModeChar, Mask);
1091
1092         /* and local users in channel */
1093         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1094                                   "MODE %s %c%c %s", Channel_Name(Channel),
1095                                   IsAdd ? '+' : '-', ModeChar, Mask );
1096
1097         return ok;
1098 } /* Send_ListChange */
1099
1100 /* -eof- */