src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-macros.h"
  29 #include "irc-write.h"
  30 #include "lists.h"
  31 #include "log.h"
  32 #include "parse.h"
  33 #include "messages.h"
  34 #include "conf.h"
  35
  36 #include "exp.h"
  37 #include "irc-mode.h"
  38
  39 static bool Client_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  40                                 CLIENT *Target));
  41 static bool Channel_Mode PARAMS((CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42                                  CHANNEL *Channel));
  43
  44 static bool Add_To_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  45                                 CHANNEL *Channel, const char *Pattern));
  46 static bool Del_From_List PARAMS((char what, CLIENT *Prefix, CLIENT *Client,
  47                                   CHANNEL *Channel, const char *Pattern));
  48
  49 static bool Send_ListChange PARAMS((const bool IsAdd, const char ModeChar,
  50                                     CLIENT *Prefix, CLIENT *Client,
  51                                     CHANNEL *Channel, const char *Mask));
  52
  53 /**
  54  * Handler for the IRC "MODE" command.
  55  *
  56  * This function detects whether user or channel modes should be modified
  57  * and calls the appropriate sub-functions.
  58  *
  59  * @param Client The client from which this command has been received.
  60  * @param Req Request structure with prefix and all parameters.
  61  * @return CONNECTED or DISCONNECTED.
  62  */
  63 GLOBAL bool
  64 IRC_MODE( CLIENT *Client, REQUEST *Req )
  65 {
  66         CLIENT *cl, *origin;
  67         CHANNEL *chan;
  68
  69         assert(Client != NULL);
  70         assert(Req != NULL);
  71
  72         _IRC_GET_SENDER_OR_RETURN_(origin, Req, Client)
  73
  74         /* Channel or user mode? */
  75         cl = NULL; chan = NULL;
  76         if (Client_IsValidNick(Req->argv[0]))
  77                 cl = Client_Search(Req->argv[0]);
  78         if (Channel_IsValidName(Req->argv[0]))
  79                 chan = Channel_Search(Req->argv[0]);
  80
  81         if (cl)
  82                 return Client_Mode(Client, Req, origin, cl);
  83         if (chan)
  84                 return Channel_Mode(Client, Req, origin, chan);
  85
  86         /* No target found! */
  87         return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
  88                         Client_ID(Client), Req->argv[0]);
  89 } /* IRC_MODE */
  90
  91 /**
  92  * Check if the "mode limit" for a client has been reached.
  93  *
  94  * This limit doesn't apply for servers or services!
  95  *
  96  * @param Client The client to check.
  97  * @param Count The number of modes already handled.
  98  * @return true if the limit has been reached.
  99  */
 100 static bool
 101 Mode_Limit_Reached(CLIENT *Client, int Count)
 102 {
 103         if (Client_Type(Client) == CLIENT_SERVER
 104             || Client_Type(Client) == CLIENT_SERVICE)
 105                 return false;
 106         if (Count < MAX_HNDL_MODES_ARG)
 107                 return false;
 108         return true;
 109 }
 110
 111 /**
 112  * Handle client mode requests
 113  *
 114  * @param Client The client from which this command has been received.
 115  * @param Req Request structure with prefix and all parameters.
 116  * @param Origin The originator of the MODE command (prefix).
 117  * @param Target The target (client) of this MODE command.
 118  * @return CONNECTED or DISCONNECTED.
 119  */
 120 static bool
 121 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 122 {
 123         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 124         bool ok, set;
 125         bool send_RPL_HOSTHIDDEN_MSG = false;
 126         int mode_arg;
 127         size_t len;
 128
 129         /* Is the client allowed to request or change the modes? */
 130         if (Client_Type(Client) == CLIENT_USER) {
 131                 /* Users are only allowed to manipulate their own modes! */
 132                 if (Target != Client)
 133                         return IRC_WriteErrClient(Client,
 134                                                   ERR_USERSDONTMATCH_MSG,
 135                                                   Client_ID(Client));
 136         }
 137
 138         /* Mode request: let's answer it :-) */
 139         if (Req->argc == 1)
 140                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 141                                           Client_ID(Target),
 142                                           Client_Modes(Target));
 143
 144         mode_arg = 1;
 145         mode_ptr = Req->argv[mode_arg];
 146
 147         /* Initial state: set or unset modes? */
 148         if (*mode_ptr == '+') {
 149                 set = true;
 150                 strcpy(the_modes, "+");
 151         } else if (*mode_ptr == '-') {
 152                 set = false;
 153                 strcpy(the_modes, "-");
 154         } else
 155                 return IRC_WriteErrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 156                                           Client_ID(Origin));
 157
 158         x[1] = '\0';
 159         ok = CONNECTED;
 160         while (mode_ptr) {
 161                 mode_ptr++;
 162                 if (!*mode_ptr) {
 163                         /* Try next argument if there's any */
 164                         mode_arg++;
 165                         if (mode_arg < Req->argc)
 166                                 mode_ptr = Req->argv[mode_arg];
 167                         else
 168                                 break;
 169                 }
 170
 171                 switch(*mode_ptr) {
 172                   case '+':
 173                   case '-':
 174                         if ((*mode_ptr == '+' && !set)
 175                             || (*mode_ptr == '-' && set)) {
 176                                 /* Action modifier ("+"/"-") must be changed */
 177                                 len = strlen(the_modes) - 1;
 178                                 if (the_modes[len] == '+'
 179                                     || the_modes[len] == '-') {
 180                                         /* Last character in the "result
 181                                          * string" was an "action", so just
 182                                          * overwrite it with the new action */
 183                                         the_modes[len] = *mode_ptr;
 184                                 } else {
 185                                         /* Append new modifier character to
 186                                          * the resulting mode string */
 187                                         x[0] = *mode_ptr;
 188                                         strlcat(the_modes, x,
 189                                                 sizeof(the_modes));
 190                                 }
 191                                 if (*mode_ptr == '+')
 192                                         set = true;
 193                                 else
 194                                         set = false;
 195                         }
 196                         continue;
 197                 }
 198
 199                 /* Validate modes */
 200                 x[0] = '\0';
 201                 switch (*mode_ptr) {
 202                 case 'b': /* Block private msgs */
 203                 case 'C': /* Only messages from clients sharing a channel */
 204                 case 'i': /* Invisible */
 205                 case 's': /* Server messages */
 206                 case 'w': /* Wallops messages */
 207                         x[0] = *mode_ptr;
 208                         break;
 209                 case 'a': /* Away */
 210                         if (Client_Type(Client) == CLIENT_SERVER) {
 211                                 x[0] = 'a';
 212                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 213                         } else
 214                                 ok = IRC_WriteErrClient(Origin,
 215                                                         ERR_NOPRIVILEGES_MSG,
 216                                                         Client_ID(Origin));
 217                         break;
 218                 case 'B': /* Bot */
 219                         if (Client_HasMode(Client, 'r'))
 220                                 ok = IRC_WriteErrClient(Origin,
 221                                                         ERR_RESTRICTED_MSG,
 222                                                         Client_ID(Origin));
 223                         else
 224                                 x[0] = 'B';
 225                         break;
 226                 case 'c': /* Receive connect notices
 227                            * (only settable by IRC operators!) */
 228                         if (!set || Client_Type(Client) == CLIENT_SERVER
 229                             || Client_OperByMe(Origin))
 230                                 x[0] = 'c';
 231                         else
 232                                 ok = IRC_WriteErrClient(Origin,
 233                                                         ERR_NOPRIVILEGES_MSG,
 234                                                         Client_ID(Origin));
 235                         break;
 236                 case 'o': /* IRC operator (only unsettable!) */
 237                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 238                                 Client_SetOperByMe(Target, false);
 239                                 x[0] = 'o';
 240                         } else
 241                                 ok = IRC_WriteErrClient(Origin,
 242                                                         ERR_NOPRIVILEGES_MSG,
 243                                                         Client_ID(Origin));
 244                         break;
 245                 case 'q': /* KICK-protected user */
 246                         if (!set || Client_Type(Client) == CLIENT_SERVER
 247                             || Client_OperByMe(Origin))
 248                                 x[0] = 'q';
 249                         else
 250                                 ok = IRC_WriteErrClient(Origin,
 251                                                         ERR_NOPRIVILEGES_MSG,
 252                                                         Client_ID(Origin));
 253                         break;
 254                 case 'r': /* Restricted (only settable) */
 255                         if (set || Client_Type(Client) == CLIENT_SERVER)
 256                                 x[0] = 'r';
 257                         else
 258                                 ok = IRC_WriteErrClient(Origin,
 259                                                         ERR_RESTRICTED_MSG,
 260                                                         Client_ID(Origin));
 261                         break;
 262                 case 'R': /* Registered (not [un]settable by clients) */
 263                         if (Client_Type(Client) == CLIENT_SERVER)
 264                                 x[0] = 'R';
 265                         else
 266                                 ok = IRC_WriteErrClient(Origin,
 267                                                         ERR_NICKREGISTER_MSG,
 268                                                         Client_ID(Origin));
 269                         break;
 270                 case 'x': /* Cloak hostname */
 271                         if (Client_HasMode(Client, 'r'))
 272                                 ok = IRC_WriteErrClient(Origin,
 273                                                         ERR_RESTRICTED_MSG,
 274                                                         Client_ID(Origin));
 275                         else if (!set || Conf_CloakHostModeX[0]
 276                                  || Client_Type(Client) == CLIENT_SERVER
 277                                  || Client_OperByMe(Client)) {
 278                                 x[0] = 'x';
 279                                 send_RPL_HOSTHIDDEN_MSG = true;
 280                         } else
 281                                 ok = IRC_WriteErrClient(Origin,
 282                                                         ERR_NOPRIVILEGES_MSG,
 283                                                         Client_ID(Origin));
 284                         break;
 285                 default:
 286                         if (Client_Type(Client) != CLIENT_SERVER) {
 287                                 Log(LOG_DEBUG,
 288                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 289                                     set ? '+' : '-', *mode_ptr,
 290                                     Client_ID(Origin));
 291                                 ok = IRC_WriteErrClient(Origin,
 292                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 293                                                         Client_ID(Origin),
 294                                                         set ? '+' : '-',
 295                                                         *mode_ptr);
 296                                 x[0] = '\0';
 297                         } else {
 298                                 Log(LOG_DEBUG,
 299                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 300                                     set ? '+' : '-', *mode_ptr,
 301                                     Client_ID(Origin), Client_ID(Target));
 302                                 x[0] = *mode_ptr;
 303                         }
 304                 }
 305
 306                 if (!ok)
 307                         break;
 308
 309                 /* Is there a valid mode change? */
 310                 if (!x[0])
 311                         continue;
 312
 313                 if (set) {
 314                         if (Client_ModeAdd(Target, x[0]))
 315                                 strlcat(the_modes, x, sizeof(the_modes));
 316                 } else {
 317                         if (Client_ModeDel(Target, x[0]))
 318                                 strlcat(the_modes, x, sizeof(the_modes));
 319                 }
 320         }
 321
 322         /* Are there changed modes? */
 323         if (the_modes[1]) {
 324                 /* Remove needless action modifier characters */
 325                 len = strlen(the_modes) - 1;
 326                 if (the_modes[len] == '+' || the_modes[len] == '-')
 327                         the_modes[len] = '\0';
 328
 329                 if (Client_Type(Client) == CLIENT_SERVER) {
 330                         /* Forward modes to other servers */
 331                         if (Client_Conn(Target) != NONE) {
 332                                 /* Remote server (service?) changed modes
 333                                  * for one of our clients. Inform it! */
 334                                 IRC_WriteStrClientPrefix(Target, Origin,
 335                                                          "MODE %s :%s",
 336                                                          Client_ID(Target),
 337                                                          the_modes);
 338                         }
 339                         IRC_WriteStrServersPrefix(Client, Origin,
 340                                                   "MODE %s :%s",
 341                                                   Client_ID(Target),
 342                                                   the_modes);
 343                 } else {
 344                         /* Send reply to client and inform other servers */
 345                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 346                                                       "MODE %s :%s",
 347                                                       Client_ID(Target),
 348                                                       the_modes);
 349                         IRC_WriteStrServersPrefix(Client, Origin,
 350                                                   "MODE %s :%s",
 351                                                   Client_ID(Target),
 352                                                   the_modes);
 353                 }
 354
 355                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 356                         /* A new (cloaked) hostname must be announced */
 357                         IRC_WriteStrClientPrefix(Target, Origin,
 358                                                  RPL_HOSTHIDDEN_MSG,
 359                                                  Client_ID(Target),
 360                                                  Client_HostnameDisplayed(Target));
 361
 362                 }
 363
 364                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 365                          Client_TypeText(Target), Client_Mask(Target),
 366                          Client_Modes(Target));
 367         }
 368
 369         IRC_SetPenalty(Client, 1);
 370         return ok;
 371 } /* Client_Mode */
 372
 373 /*
 374  * Reply to a channel mode request.
 375  *
 376  * @param Origin The originator of the MODE command (prefix).
 377  * @param Channel The channel of which the modes should be sent.
 378  * @return CONNECTED or DISCONNECTED.
 379  */
 380 static bool
 381 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 382 {
 383         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 384         const char *mode_ptr;
 385
 386         /* Member or not? -- That's the question! */
 387         if (!Channel_IsMemberOf(Channel, Origin))
 388                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 389                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 390
 391         /* The sender is a member: generate extended reply */
 392         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 393         mode_ptr = the_modes;
 394         the_args[0] = '\0';
 395
 396         while(*mode_ptr) {
 397                 switch(*mode_ptr) {
 398                 case 'l':
 399                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 400                         strlcat(the_args, argadd, sizeof(the_args));
 401                         break;
 402                 case 'k':
 403                         strlcat(the_args, " ", sizeof(the_args));
 404                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 405                         break;
 406                 }
 407                 mode_ptr++;
 408         }
 409         if (the_args[0])
 410                 strlcat(the_modes, the_args, sizeof(the_modes));
 411
 412         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 413                                 Client_ID(Origin), Channel_Name(Channel),
 414                                 the_modes))
 415                 return DISCONNECTED;
 416 #ifndef STRICT_RFC
 417         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 418                                   Client_ID(Origin), Channel_Name(Channel),
 419                                   Channel_CreationTime(Channel)))
 420                 return DISCONNECTED;
 421 #endif
 422         return CONNECTED;
 423 }
 424
 425 /**
 426  * Handle channel mode and channel-user mode changes
 427  *
 428  * @param Client The client from which this command has been received.
 429  * @param Req Request structure with prefix and all parameters.
 430  * @param Origin The originator of the MODE command (prefix).
 431  * @param Channel The target channel of this MODE command.
 432  * @return CONNECTED or DISCONNECTED.
 433  */
 434 static bool
 435 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 436 {
 437         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 438             argadd[CLIENT_PASS_LEN], *mode_ptr;
 439         bool connected, set, skiponce, retval, use_servermode,
 440              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 441         int mode_arg, arg_arg, mode_arg_count = 0;
 442         CLIENT *client;
 443         long l;
 444         size_t len;
 445
 446         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 447
 448         if (Channel_IsModeless(Channel))
 449                 return IRC_WriteErrClient(Client, ERR_NOCHANMODES_MSG,
 450                                 Client_ID(Client), Channel_Name(Channel));
 451
 452         /* Mode request: let's answer it :-) */
 453         if (Req->argc <= 1)
 454                 return Channel_Mode_Answer_Request(Origin, Channel);
 455
 456         /* Check if origin is oper and opers can use mode */
 457         use_servermode = Conf_OperServerMode;
 458         if(Client_OperByMe(Client) && Conf_OperCanMode) {
 459                 is_oper = true;
 460         }
 461
 462         /* Check if client is a server/service */
 463         if(Client_Type(Client) == CLIENT_SERVER ||
 464            Client_Type(Client) == CLIENT_SERVICE) {
 465                 is_machine = true;
 466         }
 467
 468         /* Check if client is member of channel or an oper or an server/service */
 469         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 470                 return IRC_WriteErrClient(Origin, ERR_NOTONCHANNEL_MSG,
 471                                           Client_ID(Origin),
 472                                           Channel_Name(Channel));
 473
 474         mode_arg = 1;
 475         mode_ptr = Req->argv[mode_arg];
 476         if (Req->argc > mode_arg + 1)
 477                 arg_arg = mode_arg + 1;
 478         else
 479                 arg_arg = -1;
 480
 481         /* Initial state: set or unset modes? */
 482         skiponce = false;
 483         switch (*mode_ptr) {
 484         case '-':
 485                 set = false;
 486                 break;
 487         case '+':
 488                 set = true;
 489                 break;
 490         default:
 491                 set = true;
 492                 skiponce = true;
 493         }
 494
 495         /* Prepare reply string */
 496         strcpy(the_modes, set ? "+" : "-");
 497         the_args[0] = '\0';
 498
 499         x[1] = '\0';
 500         connected = CONNECTED;
 501         while (mode_ptr) {
 502                 if (!skiponce)
 503                         mode_ptr++;
 504                 if (!*mode_ptr) {
 505                         /* Try next argument if there's any */
 506                         if (arg_arg < 0)
 507                                 break;
 508                         if (arg_arg > mode_arg)
 509                                 mode_arg = arg_arg;
 510                         else
 511                                 mode_arg++;
 512
 513                         if (mode_arg >= Req->argc)
 514                                 break;
 515                         mode_ptr = Req->argv[mode_arg];
 516
 517                         if (Req->argc > mode_arg + 1)
 518                                 arg_arg = mode_arg + 1;
 519                         else
 520                                 arg_arg = -1;
 521                 }
 522                 skiponce = false;
 523
 524                 switch (*mode_ptr) {
 525                 case '+':
 526                 case '-':
 527                         if (((*mode_ptr == '+') && !set)
 528                             || ((*mode_ptr == '-') && set)) {
 529                                 /* Action modifier ("+"/"-") must be changed ... */
 530                                 len = strlen(the_modes) - 1;
 531                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 532                                         /* Adjust last action modifier in result */
 533                                         the_modes[len] = *mode_ptr;
 534                                 } else {
 535                                         /* Append modifier character to result string */
 536                                         x[0] = *mode_ptr;
 537                                         strlcat(the_modes, x, sizeof(the_modes));
 538                                 }
 539                                 set = *mode_ptr == '+';
 540                         }
 541                         continue;
 542                 }
 543
 544                 /* Are there arguments left? */
 545                 if (arg_arg >= Req->argc)
 546                         arg_arg = -1;
 547
 548                 if(!is_machine && !is_oper) {
 549                         if (Channel_UserHasMode(Channel, Client, 'q'))
 550                                 is_owner = true;
 551                         if (Channel_UserHasMode(Channel, Client, 'a'))
 552                                 is_admin = true;
 553                         if (Channel_UserHasMode(Channel, Client, 'o'))
 554                                 is_op = true;
 555                         if (Channel_UserHasMode(Channel, Client, 'h'))
 556                                 is_halfop = true;
 557                 }
 558
 559                 /* Validate modes */
 560                 x[0] = '\0';
 561                 argadd[0] = '\0';
 562                 client = NULL;
 563                 switch (*mode_ptr) {
 564                 /* --- Channel modes --- */
 565                 case 'R': /* Registered users only */
 566                 case 's': /* Secret channel */
 567                 case 'z': /* Secure connections only */
 568                         if(!is_oper && !is_machine && !is_owner &&
 569                            !is_admin && !is_op) {
 570                                 connected = IRC_WriteErrClient(Origin,
 571                                         ERR_CHANOPRIVSNEEDED_MSG,
 572                                         Client_ID(Origin), Channel_Name(Channel));
 573                                 goto chan_exit;
 574                         }
 575                 case 'i': /* Invite only */
 576                 case 'V': /* Invite disallow */
 577                 case 'M': /* Only identified nicks can write */
 578                 case 'm': /* Moderated */
 579                 case 'n': /* Only members can write */
 580                 case 'Q': /* No kicks */
 581                 case 't': /* Topic locked */
 582                         if(is_oper || is_machine || is_owner ||
 583                            is_admin || is_op || is_halfop)
 584                                 x[0] = *mode_ptr;
 585                         else
 586                                 connected = IRC_WriteErrClient(Origin,
 587                                         ERR_CHANOPRIVSNEEDED_MSG,
 588                                         Client_ID(Origin), Channel_Name(Channel));
 589                         break;
 590                 case 'k': /* Channel key */
 591                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 592                                 goto chan_exit;
 593                         if (!set) {
 594                                 if (is_oper || is_machine || is_owner ||
 595                                     is_admin || is_op || is_halfop)
 596                                         x[0] = *mode_ptr;
 597                                 else
 598                                         connected = IRC_WriteErrClient(Origin,
 599                                                 ERR_CHANOPRIVSNEEDED_MSG,
 600                                                 Client_ID(Origin),
 601                                                 Channel_Name(Channel));
 602                                 break;
 603                         }
 604                         if (arg_arg > mode_arg) {
 605                                 if (is_oper || is_machine || is_owner ||
 606                                     is_admin || is_op || is_halfop) {
 607                                         Channel_ModeDel(Channel, 'k');
 608                                         Channel_SetKey(Channel,
 609                                                        Req->argv[arg_arg]);
 610                                         strlcpy(argadd, Channel_Key(Channel),
 611                                                 sizeof(argadd));
 612                                         x[0] = *mode_ptr;
 613                                 } else {
 614                                         connected = IRC_WriteErrClient(Origin,
 615                                                 ERR_CHANOPRIVSNEEDED_MSG,
 616                                                 Client_ID(Origin),
 617                                                 Channel_Name(Channel));
 618                                 }
 619                                 Req->argv[arg_arg][0] = '\0';
 620                                 arg_arg++;
 621                         } else {
 622 #ifdef STRICT_RFC
 623                                 /* Only send error message in "strict" mode,
 624                                  * this is how ircd2.11 and others behave ... */
 625                                 IRC_SetPenalty(Origin, 2);
 626                                 connected = IRC_WriteErrClient(Origin,
 627                                         ERR_NEEDMOREPARAMS_MSG,
 628                                         Client_ID(Origin), Req->command);
 629 #endif
 630                                 goto chan_exit;
 631                         }
 632                         break;
 633                 case 'l': /* Member limit */
 634                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 635                                 goto chan_exit;
 636                         if (!set) {
 637                                 if (is_oper || is_machine || is_owner ||
 638                                     is_admin || is_op || is_halfop)
 639                                         x[0] = *mode_ptr;
 640                                 else
 641                                         connected = IRC_WriteErrClient(Origin,
 642                                                 ERR_CHANOPRIVSNEEDED_MSG,
 643                                                 Client_ID(Origin),
 644                                                 Channel_Name(Channel));
 645                                 break;
 646                         }
 647                         if (arg_arg > mode_arg) {
 648                                 if (is_oper || is_machine || is_owner ||
 649                                     is_admin || is_op || is_halfop) {
 650                                         l = atol(Req->argv[arg_arg]);
 651                                         if (l > 0 && l < 0xFFFF) {
 652                                                 Channel_ModeDel(Channel, 'l');
 653                                                 Channel_SetMaxUsers(Channel, l);
 654                                                 snprintf(argadd, sizeof(argadd),
 655                                                          "%ld", l);
 656                                                 x[0] = *mode_ptr;
 657                                         }
 658                                 } else {
 659                                         connected = IRC_WriteErrClient(Origin,
 660                                                 ERR_CHANOPRIVSNEEDED_MSG,
 661                                                 Client_ID(Origin),
 662                                                 Channel_Name(Channel));
 663                                 }
 664                                 Req->argv[arg_arg][0] = '\0';
 665                                 arg_arg++;
 666                         } else {
 667 #ifdef STRICT_RFC
 668                                 /* Only send error message in "strict" mode,
 669                                  * this is how ircd2.11 and others behave ... */
 670                                 IRC_SetPenalty(Origin, 2);
 671                                 connected = IRC_WriteErrClient(Origin,
 672                                         ERR_NEEDMOREPARAMS_MSG,
 673                                         Client_ID(Origin), Req->command);
 674 #endif
 675                                 goto chan_exit;
 676                         }
 677                         break;
 678                 case 'O': /* IRC operators only */
 679                         if (set) {
 680                                 /* Only IRC operators are allowed to
 681                                  * set the 'O' channel mode! */
 682                                 if(is_oper || is_machine)
 683                                         x[0] = 'O';
 684                                 else
 685                                         connected = IRC_WriteErrClient(Origin,
 686                                                 ERR_NOPRIVILEGES_MSG,
 687                                                 Client_ID(Origin));
 688                         } else if(is_oper || is_machine || is_owner ||
 689                                   is_admin || is_op)
 690                                 x[0] = 'O';
 691                         else
 692                                 connected = IRC_WriteErrClient(Origin,
 693                                         ERR_CHANOPRIVSNEEDED_MSG,
 694                                         Client_ID(Origin),
 695                                         Channel_Name(Channel));
 696                         break;
 697                 case 'P': /* Persistent channel */
 698                         if (set) {
 699                                 /* Only IRC operators are allowed to
 700                                  * set the 'P' channel mode! */
 701                                 if(is_oper || is_machine)
 702                                         x[0] = 'P';
 703                                 else
 704                                         connected = IRC_WriteErrClient(Origin,
 705                                                 ERR_NOPRIVILEGES_MSG,
 706                                                 Client_ID(Origin));
 707                         } else if(is_oper || is_machine || is_owner ||
 708                                   is_admin || is_op)
 709                                 x[0] = 'P';
 710                         else
 711                                 connected = IRC_WriteErrClient(Origin,
 712                                         ERR_CHANOPRIVSNEEDED_MSG,
 713                                         Client_ID(Origin),
 714                                         Channel_Name(Channel));
 715                         break;
 716                 /* --- Channel user modes --- */
 717                 case 'q': /* Owner */
 718                 case 'a': /* Channel admin */
 719                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 720                                 connected = IRC_WriteErrClient(Origin,
 721                                         ERR_CHANOPPRIVTOOLOW_MSG,
 722                                         Client_ID(Origin),
 723                                         Channel_Name(Channel));
 724                                 goto chan_exit;
 725                         }
 726                 case 'o': /* Channel operator */
 727                         if(!is_oper && !is_machine && !is_owner &&
 728                            !is_admin && !is_op) {
 729                                 connected = IRC_WriteErrClient(Origin,
 730                                         ERR_CHANOPRIVSNEEDED_MSG,
 731                                         Client_ID(Origin),
 732                                         Channel_Name(Channel));
 733                                 goto chan_exit;
 734                         }
 735                 case 'h': /* Half Op */
 736                         if(!is_oper && !is_machine && !is_owner &&
 737                            !is_admin && !is_op) {
 738                                 connected = IRC_WriteErrClient(Origin,
 739                                         ERR_CHANOPRIVSNEEDED_MSG,
 740                                         Client_ID(Origin),
 741                                         Channel_Name(Channel));
 742                                 goto chan_exit;
 743                         }
 744                 case 'v': /* Voice */
 745                         if (arg_arg > mode_arg) {
 746                                 if (is_oper || is_machine || is_owner ||
 747                                     is_admin || is_op || is_halfop) {
 748                                         client = Client_Search(Req->argv[arg_arg]);
 749                                         if (client)
 750                                                 x[0] = *mode_ptr;
 751                                         else
 752                                                 connected = IRC_WriteErrClient(Origin,
 753                                                         ERR_NOSUCHNICK_MSG,
 754                                                         Client_ID(Origin),
 755                                                         Req->argv[arg_arg]);
 756                                 } else {
 757                                         connected = IRC_WriteErrClient(Origin,
 758                                                 ERR_CHANOPRIVSNEEDED_MSG,
 759                                                 Client_ID(Origin),
 760                                                 Channel_Name(Channel));
 761                                 }
 762                                 Req->argv[arg_arg][0] = '\0';
 763                                 arg_arg++;
 764                         } else {
 765 #ifdef STRICT_RFC
 766                                 /* Report an error to the client, when a user
 767                                  * mode should be changed but no nickname is
 768                                  * given. But don't do it when not in "strict"
 769                                  * mode, because most other servers don't do
 770                                  * it as well and some clients send "wired"
 771                                  * MODE commands like "MODE #chan -ooo nick". */
 772                                 IRC_SetPenalty(Origin, 2);
 773                                 connected = IRC_WriteErrClient(Origin,
 774                                         ERR_NEEDMOREPARAMS_MSG,
 775                                         Client_ID(Origin), Req->command);
 776 #endif
 777                                 goto chan_exit;
 778                         }
 779                         break;
 780                 /* --- Channel lists --- */
 781                 case 'I': /* Invite lists */
 782                 case 'b': /* Ban lists */
 783                 case 'e': /* Channel exception lists */
 784                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 785                                 goto chan_exit;
 786                         if (arg_arg > mode_arg) {
 787                                 /* modify list */
 788                                 if (is_oper || is_machine || is_owner ||
 789                                     is_admin || is_op || is_halfop) {
 790                                         connected = set
 791                                            ? Add_To_List(*mode_ptr, Origin,
 792                                                 Client, Channel,
 793                                                 Req->argv[arg_arg])
 794                                            : Del_From_List(*mode_ptr, Origin,
 795                                                 Client, Channel,
 796                                                 Req->argv[arg_arg]);
 797                                 } else {
 798                                         connected = IRC_WriteErrClient(Origin,
 799                                                 ERR_CHANOPRIVSNEEDED_MSG,
 800                                                 Client_ID(Origin),
 801                                                 Channel_Name(Channel));
 802                                 }
 803                                 Req->argv[arg_arg][0] = '\0';
 804                                 arg_arg++;
 805                         } else {
 806                                 switch (*mode_ptr) {
 807                                 case 'I':
 808                                         Channel_ShowInvites(Origin, Channel);
 809                                         break;
 810                                 case 'b':
 811                                         Channel_ShowBans(Origin, Channel);
 812                                         break;
 813                                 case 'e':
 814                                         Channel_ShowExcepts(Origin, Channel);
 815                                         break;
 816                                 }
 817                         }
 818                         break;
 819                 default:
 820                         if (Client_Type(Client) != CLIENT_SERVER) {
 821                                 Log(LOG_DEBUG,
 822                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 823                                     set ? '+' : '-', *mode_ptr,
 824                                     Client_ID(Origin), Channel_Name(Channel));
 825                                 connected = IRC_WriteErrClient(Origin,
 826                                         ERR_UNKNOWNMODE_MSG,
 827                                         Client_ID(Origin), *mode_ptr,
 828                                         Channel_Name(Channel));
 829                                 x[0] = '\0';
 830                         } else {
 831                                 Log(LOG_DEBUG,
 832                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 833                                     set ? '+' : '-', *mode_ptr,
 834                                     Client_ID(Origin), Channel_Name(Channel));
 835                                 x[0] = *mode_ptr;
 836                         }
 837                 }
 838
 839                 if (!connected)
 840                         break;
 841
 842                 /* Is there a valid mode change? */
 843                 if (!x[0])
 844                         continue;
 845
 846                 /* Validate target client */
 847                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 848                         if (!IRC_WriteErrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
 849                                                 Client_ID(Origin),
 850                                                 Client_ID(client),
 851                                                 Channel_Name(Channel)))
 852                                 break;
 853                         continue;
 854                 }
 855
 856                 if (client) {
 857                         /* Channel-User-Mode */
 858                         retval = set
 859                                ? Channel_UserModeAdd(Channel, client, x[0])
 860                                : Channel_UserModeDel(Channel, client, x[0]);
 861                         if (retval) {
 862                                 strlcat(the_args, " ", sizeof(the_args));
 863                                 strlcat(the_args, Client_ID(client),
 864                                         sizeof(the_args));
 865                                 strlcat(the_modes, x, sizeof(the_modes));
 866                                 LogDebug
 867                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 868                                      Client_Mask(client), Channel_Name(Channel),
 869                                      Channel_UserModes(Channel, client));
 870                         }
 871                 } else {
 872                         /* Channel-Mode */
 873                         retval = set
 874                                ? Channel_ModeAdd(Channel, x[0])
 875                                : Channel_ModeDel(Channel, x[0]);
 876                         if (retval) {
 877                                 strlcat(the_modes, x, sizeof(the_modes));
 878                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 879                                          Channel_Name(Channel),
 880                                          Channel_Modes(Channel));
 881                         }
 882                 }
 883
 884                 /* Are there additional arguments to add? */
 885                 if (argadd[0]) {
 886                         strlcat(the_args, " ", sizeof(the_args));
 887                         strlcat(the_args, argadd, sizeof(the_args));
 888                 }
 889         }
 890
 891       chan_exit:
 892         /* Are there changed modes? */
 893         if (the_modes[1]) {
 894                 /* Clean up mode string */
 895                 len = strlen(the_modes) - 1;
 896                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 897                         the_modes[len] = '\0';
 898
 899                 if (Client_Type(Client) == CLIENT_SERVER) {
 900                         /* MODE requests for local channels from other servers
 901                          * are definitely invalid! */
 902                         if (Channel_IsLocal(Channel)) {
 903                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 904                                 return CONNECTED;
 905                         }
 906
 907                         /* Forward mode changes to channel users and all the
 908                          * other remote servers: */
 909                         IRC_WriteStrServersPrefix(Client, Origin,
 910                                 "MODE %s %s%s", Channel_Name(Channel),
 911                                 the_modes, the_args);
 912                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 913                                 false, "MODE %s %s%s", Channel_Name(Channel),
 914                                 the_modes, the_args);
 915                 } else {
 916                         if (use_servermode)
 917                                 Origin = Client_ThisServer();
 918                         /* Send reply to client and inform other servers and channel users */
 919                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 920                                         "MODE %s %s%s", Channel_Name(Channel),
 921                                         the_modes, the_args);
 922                         /* Only forward requests for non-local channels */
 923                         if (!Channel_IsLocal(Channel))
 924                                 IRC_WriteStrServersPrefix(Client, Origin,
 925                                         "MODE %s %s%s", Channel_Name(Channel),
 926                                         the_modes, the_args);
 927                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 928                                 false, "MODE %s %s%s", Channel_Name(Channel),
 929                                 the_modes, the_args);
 930                 }
 931         }
 932
 933         IRC_SetPenalty(Client, 1);
 934         return connected;
 935 } /* Channel_Mode */
 936
 937 /**
 938  * Handler for the IRC "AWAY" command.
 939  *
 940  * @param Client The client from which this command has been received.
 941  * @param Req Request structure with prefix and all parameters.
 942  * @return CONNECTED or DISCONNECTED.
 943  */
 944 GLOBAL bool
 945 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 946 {
 947         assert (Client != NULL);
 948         assert (Req != NULL);
 949
 950         if (Req->argc == 1 && Req->argv[0][0]) {
 951                 Client_SetAway(Client, Req->argv[0]);
 952                 Client_ModeAdd(Client, 'a');
 953                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 954                                           Client_ID( Client));
 955                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 956                                           Client_ID( Client));
 957         } else {
 958                 Client_ModeDel(Client, 'a');
 959                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 960                                           Client_ID( Client));
 961                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 962                                           Client_ID( Client));
 963         }
 964 } /* IRC_AWAY */
 965
 966 /**
 967  * Add entries to channel invite, ban and exception lists.
 968  *
 969  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 970  * @param Prefix The originator of the command.
 971  * @param Client The sender of the command.
 972  * @param Channel The channel of which the list should be modified.
 973  * @param Pattern The pattern to add to the list.
 974  * @return CONNECTED or DISCONNECTED.
 975  */
 976 static bool
 977 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 978             const char *Pattern)
 979 {
 980         char mask[MASK_LEN];
 981         struct list_head *list = NULL;
 982         long int current_count;
 983
 984         assert(Client != NULL);
 985         assert(Channel != NULL);
 986         assert(Pattern != NULL);
 987         assert(what == 'I' || what == 'b' || what == 'e');
 988
 989         Lists_MakeMask(Pattern, mask, sizeof(mask));
 990         current_count = Lists_Count(Channel_GetListInvites(Channel))
 991                         + Lists_Count(Channel_GetListExcepts(Channel))
 992                         + Lists_Count(Channel_GetListBans(Channel));
 993
 994         switch(what) {
 995                 case 'I':
 996                         list = Channel_GetListInvites(Channel);
 997                         break;
 998                 case 'b':
 999                         list = Channel_GetListBans(Channel);
1000                         break;
1001                 case 'e':
1002                         list = Channel_GetListExcepts(Channel);
1003                         break;
1004         }
1005
1006         if (Lists_CheckDupeMask(list, mask))
1007                 return CONNECTED;
1008         if (Client_Type(Client) == CLIENT_USER &&
1009             current_count >= MAX_HNDL_CHANNEL_LISTS)
1010                 return IRC_WriteErrClient(Client, ERR_LISTFULL_MSG,
1011                                           Client_ID(Client),
1012                                           Channel_Name(Channel), mask,
1013                                           MAX_HNDL_CHANNEL_LISTS);
1014
1015         switch (what) {
1016                 case 'I':
1017                         if (!Channel_AddInvite(Channel, mask, false))
1018                                 return CONNECTED;
1019                         break;
1020                 case 'b':
1021                         if (!Channel_AddBan(Channel, mask))
1022                                 return CONNECTED;
1023                         break;
1024                 case 'e':
1025                         if (!Channel_AddExcept(Channel, mask))
1026                                 return CONNECTED;
1027                         break;
1028         }
1029         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1030 }
1031
1032 /**
1033  * Delete entries from channel invite, ban and exception lists.
1034  *
1035  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1036  * @param Prefix The originator of the command.
1037  * @param Client The sender of the command.
1038  * @param Channel The channel of which the list should be modified.
1039  * @param Pattern The pattern to add to the list.
1040  * @return CONNECTED or DISCONNECTED.
1041  */
1042 static bool
1043 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1044               const char *Pattern)
1045 {
1046         char mask[MASK_LEN];
1047         struct list_head *list = NULL;
1048
1049         assert(Client != NULL);
1050         assert(Channel != NULL);
1051         assert(Pattern != NULL);
1052         assert(what == 'I' || what == 'b' || what == 'e');
1053
1054         Lists_MakeMask(Pattern, mask, sizeof(mask));
1055
1056         switch (what) {
1057                 case 'I':
1058                         list = Channel_GetListInvites(Channel);
1059                         break;
1060                 case 'b':
1061                         list = Channel_GetListBans(Channel);
1062                         break;
1063                 case 'e':
1064                         list = Channel_GetListExcepts(Channel);
1065                         break;
1066         }
1067
1068         if (!Lists_CheckDupeMask(list, mask))
1069                 return CONNECTED;
1070         Lists_Del(list, mask);
1071
1072         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1073 }
1074
1075 /**
1076  * Send information about changed channel invite/ban/exception lists to clients.
1077  *
1078  * @param IsAdd true if the list item has been added, false otherwise.
1079  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1080  * @param Prefix The originator of the mode list change.
1081  * @param Client The sender of the command.
1082  * @param Channel The channel of which the list has been modified.
1083  * @param Mask The mask which has been added or removed.
1084  * @return CONNECTED or DISCONNECTED.
1085  */
1086 static bool
1087 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1088                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1089 {
1090         bool ok = true;
1091
1092         /* Send confirmation to the client */
1093         if (Client_Type(Client) == CLIENT_USER)
1094                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1095                                               Channel_Name(Channel),
1096                                               IsAdd ? '+' : '-',
1097                                               ModeChar, Mask);
1098
1099         /* to other servers */
1100         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1101                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1102                                   ModeChar, Mask);
1103
1104         /* and local users in channel */
1105         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1106                                   "MODE %s %c%c %s", Channel_Name(Channel),
1107                                   IsAdd ? '+' : '-', ModeChar, Mask );
1108
1109         return ok;
1110 } /* Send_ListChange */
1111
1112 /* -eof- */