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 apropriate 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_ARGC_GE_OR_RETURN_(Client, Req, 1)
  73         _IRC_GET_SENDER_OR_RETURN_(origin, Req, Client)
  74
  75         /* Channel or user mode? */
  76         cl = NULL; chan = NULL;
  77         if (Client_IsValidNick(Req->argv[0]))
  78                 cl = Client_Search(Req->argv[0]);
  79         if (Channel_IsValidName(Req->argv[0]))
  80                 chan = Channel_Search(Req->argv[0]);
  81
  82         if (cl)
  83                 return Client_Mode(Client, Req, origin, cl);
  84         if (chan)
  85                 return Channel_Mode(Client, Req, origin, chan);
  86
  87         /* No target found! */
  88         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  89                         Client_ID(Client), Req->argv[0]);
  90 } /* IRC_MODE */
  91
  92 /**
  93  * Check if the "mode limit" for a client has been reached.
  94  *
  95  * This limit doesn't apply for servers or services!
  96  *
  97  * @param Client The client to check.
  98  * @param Count The number of modes already handled.
  99  * @return true if the limit has been reached.
 100  */
 101 static bool
 102 Mode_Limit_Reached(CLIENT *Client, int Count)
 103 {
 104         if (Client_Type(Client) == CLIENT_SERVER
 105             || Client_Type(Client) == CLIENT_SERVICE)
 106                 return false;
 107         if (Count < MAX_HNDL_MODES_ARG)
 108                 return false;
 109         return true;
 110 }
 111
 112 /**
 113  * Handle client mode requests
 114  *
 115  * @param Client The client from which this command has been received.
 116  * @param Req Request structure with prefix and all parameters.
 117  * @param Origin The originator of the MODE command (prefix).
 118  * @param Target The target (client) of this MODE command.
 119  * @return CONNECTED or DISCONNECTED.
 120  */
 121 static bool
 122 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 123 {
 124         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 125         bool ok, set;
 126         bool send_RPL_HOSTHIDDEN_MSG = false;
 127         int mode_arg;
 128         size_t len;
 129
 130         /* Is the client allowed to request or change the modes? */
 131         if (Client_Type(Client) == CLIENT_USER) {
 132                 /* Users are only allowed to manipulate their own modes! */
 133                 if (Target != Client)
 134                         return IRC_WriteStrClient(Client,
 135                                                   ERR_USERSDONTMATCH_MSG,
 136                                                   Client_ID(Client));
 137         }
 138
 139         /* Mode request: let's answer it :-) */
 140         if (Req->argc == 1)
 141                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 142                                           Client_ID(Target),
 143                                           Client_Modes(Target));
 144
 145         mode_arg = 1;
 146         mode_ptr = Req->argv[mode_arg];
 147
 148         /* Initial state: set or unset modes? */
 149         if (*mode_ptr == '+') {
 150                 set = true;
 151                 strcpy(the_modes, "+");
 152         } else if (*mode_ptr == '-') {
 153                 set = false;
 154                 strcpy(the_modes, "-");
 155         } else
 156                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 157                                           Client_ID(Origin));
 158
 159         x[1] = '\0';
 160         ok = CONNECTED;
 161         while (mode_ptr) {
 162                 mode_ptr++;
 163                 if (!*mode_ptr) {
 164                         /* Try next argument if there's any */
 165                         mode_arg++;
 166                         if (mode_arg < Req->argc)
 167                                 mode_ptr = Req->argv[mode_arg];
 168                         else
 169                                 break;
 170                 }
 171
 172                 switch(*mode_ptr) {
 173                   case '+':
 174                   case '-':
 175                         if ((*mode_ptr == '+' && !set)
 176                             || (*mode_ptr == '-' && set)) {
 177                                 /* Action modifier ("+"/"-") must be changed */
 178                                 len = strlen(the_modes) - 1;
 179                                 if (the_modes[len] == '+'
 180                                     || the_modes[len] == '-') {
 181                                         /* Last character in the "result
 182                                          * string" was an "action", so just
 183                                          * overwrite it with the new action */
 184                                         the_modes[len] = *mode_ptr;
 185                                 } else {
 186                                         /* Append new modifier character to
 187                                          * the resulting mode string */
 188                                         x[0] = *mode_ptr;
 189                                         strlcat(the_modes, x,
 190                                                 sizeof(the_modes));
 191                                 }
 192                                 if (*mode_ptr == '+')
 193                                         set = true;
 194                                 else
 195                                         set = false;
 196                         }
 197                         continue;
 198                 }
 199
 200                 /* Validate modes */
 201                 x[0] = '\0';
 202                 switch (*mode_ptr) {
 203                 case 'b': /* Block private msgs */
 204                 case 'C': /* Only messages from clients sharing a channel */
 205                 case 'i': /* Invisible */
 206                 case 's': /* Server messages */
 207                 case 'w': /* Wallops messages */
 208                         x[0] = *mode_ptr;
 209                         break;
 210                 case 'a': /* Away */
 211                         if (Client_Type(Client) == CLIENT_SERVER) {
 212                                 x[0] = 'a';
 213                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 214                         } else
 215                                 ok = IRC_WriteStrClient(Origin,
 216                                                         ERR_NOPRIVILEGES_MSG,
 217                                                         Client_ID(Origin));
 218                         break;
 219                 case 'B': /* Bot */
 220                         if (Client_HasMode(Client, 'r'))
 221                                 ok = IRC_WriteStrClient(Origin,
 222                                                         ERR_RESTRICTED_MSG,
 223                                                         Client_ID(Origin));
 224                         else
 225                                 x[0] = 'B';
 226                         break;
 227                 case 'c': /* Receive connect notices
 228                            * (only settable by IRC operators!) */
 229                         if (!set || Client_Type(Client) == CLIENT_SERVER
 230                             || Client_OperByMe(Origin))
 231                                 x[0] = 'c';
 232                         else
 233                                 ok = IRC_WriteStrClient(Origin,
 234                                                         ERR_NOPRIVILEGES_MSG,
 235                                                         Client_ID(Origin));
 236                         break;
 237                 case 'o': /* IRC operator (only unsettable!) */
 238                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 239                                 Client_SetOperByMe(Target, false);
 240                                 x[0] = 'o';
 241                         } else
 242                                 ok = IRC_WriteStrClient(Origin,
 243                                                         ERR_NOPRIVILEGES_MSG,
 244                                                         Client_ID(Origin));
 245                         break;
 246                 case 'q': /* KICK-protected user */
 247                         if (!set || Client_Type(Client) == CLIENT_SERVER
 248                             || Client_OperByMe(Origin))
 249                                 x[0] = 'q';
 250                         else
 251                                 ok = IRC_WriteStrClient(Origin,
 252                                                         ERR_NOPRIVILEGES_MSG,
 253                                                         Client_ID(Origin));
 254                         break;
 255                 case 'r': /* Restricted (only settable) */
 256                         if (set || Client_Type(Client) == CLIENT_SERVER)
 257                                 x[0] = 'r';
 258                         else
 259                                 ok = IRC_WriteStrClient(Origin,
 260                                                         ERR_RESTRICTED_MSG,
 261                                                         Client_ID(Origin));
 262                         break;
 263                 case 'R': /* Registered (not [un]settable by clients) */
 264                         if (Client_Type(Client) == CLIENT_SERVER)
 265                                 x[0] = 'R';
 266                         else
 267                                 ok = IRC_WriteStrClient(Origin,
 268                                                         ERR_NICKREGISTER_MSG,
 269                                                         Client_ID(Origin));
 270                         break;
 271                 case 'x': /* Cloak hostname */
 272                         if (Client_HasMode(Client, 'r'))
 273                                 ok = IRC_WriteStrClient(Origin,
 274                                                         ERR_RESTRICTED_MSG,
 275                                                         Client_ID(Origin));
 276                         else if (!set || Conf_CloakHostModeX[0]
 277                                  || Client_Type(Client) == CLIENT_SERVER
 278                                  || Client_OperByMe(Client)) {
 279                                 x[0] = 'x';
 280                                 send_RPL_HOSTHIDDEN_MSG = true;
 281                         } else
 282                                 ok = IRC_WriteStrClient(Origin,
 283                                                         ERR_NOPRIVILEGES_MSG,
 284                                                         Client_ID(Origin));
 285                         break;
 286                 default:
 287                         if (Client_Type(Client) != CLIENT_SERVER) {
 288                                 Log(LOG_DEBUG,
 289                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 290                                     set ? '+' : '-', *mode_ptr,
 291                                     Client_ID(Origin));
 292                                 ok = IRC_WriteStrClient(Origin,
 293                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 294                                                         Client_ID(Origin),
 295                                                         set ? '+' : '-',
 296                                                         *mode_ptr);
 297                                 x[0] = '\0';
 298                         } else {
 299                                 Log(LOG_DEBUG,
 300                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 301                                     set ? '+' : '-', *mode_ptr,
 302                                     Client_ID(Origin), Client_ID(Target));
 303                                 x[0] = *mode_ptr;
 304                         }
 305                 }
 306
 307                 if (!ok)
 308                         break;
 309
 310                 /* Is there a valid mode change? */
 311                 if (!x[0])
 312                         continue;
 313
 314                 if (set) {
 315                         if (Client_ModeAdd(Target, x[0]))
 316                                 strlcat(the_modes, x, sizeof(the_modes));
 317                 } else {
 318                         if (Client_ModeDel(Target, x[0]))
 319                                 strlcat(the_modes, x, sizeof(the_modes));
 320                 }
 321         }
 322
 323         /* Are there changed modes? */
 324         if (the_modes[1]) {
 325                 /* Remove needless action modifier characters */
 326                 len = strlen(the_modes) - 1;
 327                 if (the_modes[len] == '+' || the_modes[len] == '-')
 328                         the_modes[len] = '\0';
 329
 330                 if (Client_Type(Client) == CLIENT_SERVER) {
 331                         /* Forward modes to other servers */
 332                         if (Client_Conn(Target) != NONE) {
 333                                 /* Remote server (service?) changed modes
 334                                  * for one of our clients. Inform it! */
 335                                 IRC_WriteStrClientPrefix(Target, Origin,
 336                                                          "MODE %s :%s",
 337                                                          Client_ID(Target),
 338                                                          the_modes);
 339                         }
 340                         IRC_WriteStrServersPrefix(Client, Origin,
 341                                                   "MODE %s :%s",
 342                                                   Client_ID(Target),
 343                                                   the_modes);
 344                 } else {
 345                         /* Send reply to client and inform other servers */
 346                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 347                                                       "MODE %s :%s",
 348                                                       Client_ID(Target),
 349                                                       the_modes);
 350                         IRC_WriteStrServersPrefix(Client, Origin,
 351                                                   "MODE %s :%s",
 352                                                   Client_ID(Target),
 353                                                   the_modes);
 354                 }
 355
 356                 if (send_RPL_HOSTHIDDEN_MSG && Client_Conn(Target) > NONE) {
 357                         /* A new (cloaked) hostname must be annoucned */
 358                         IRC_WriteStrClientPrefix(Target, Origin,
 359                                                  RPL_HOSTHIDDEN_MSG,
 360                                                  Client_ID(Target),
 361                                                  Client_HostnameDisplayed(Target));
 362
 363                 }
 364
 365                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 366                          Client_TypeText(Target), Client_Mask(Target),
 367                          Client_Modes(Target));
 368         }
 369
 370         IRC_SetPenalty(Client, 1);
 371         return ok;
 372 } /* Client_Mode */
 373
 374 /*
 375  * Reply to a channel mode request.
 376  *
 377  * @param Origin The originator of the MODE command (prefix).
 378  * @param Channel The channel of which the modes should be sent.
 379  * @return CONNECTED or DISCONNECTED.
 380  */
 381 static bool
 382 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 383 {
 384         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 385         const char *mode_ptr;
 386
 387         /* Member or not? -- That's the question! */
 388         if (!Channel_IsMemberOf(Channel, Origin))
 389                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 390                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 391
 392         /* The sender is a member: generate extended reply */
 393         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 394         mode_ptr = the_modes;
 395         the_args[0] = '\0';
 396
 397         while(*mode_ptr) {
 398                 switch(*mode_ptr) {
 399                 case 'l':
 400                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 401                         strlcat(the_args, argadd, sizeof(the_args));
 402                         break;
 403                 case 'k':
 404                         strlcat(the_args, " ", sizeof(the_args));
 405                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 406                         break;
 407                 }
 408                 mode_ptr++;
 409         }
 410         if (the_args[0])
 411                 strlcat(the_modes, the_args, sizeof(the_modes));
 412
 413         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 414                                 Client_ID(Origin), Channel_Name(Channel),
 415                                 the_modes))
 416                 return DISCONNECTED;
 417 #ifndef STRICT_RFC
 418         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 419                                   Client_ID(Origin), Channel_Name(Channel),
 420                                   Channel_CreationTime(Channel)))
 421                 return DISCONNECTED;
 422 #endif
 423         return CONNECTED;
 424 }
 425
 426 /**
 427  * Handle channel mode and channel-user mode changes
 428  *
 429  * @param Client The client from which this command has been received.
 430  * @param Req Request structure with prefix and all parameters.
 431  * @param Origin The originator of the MODE command (prefix).
 432  * @param Channel The target channel of this MODE command.
 433  * @return CONNECTED or DISCONNECTED.
 434  */
 435 static bool
 436 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 437 {
 438         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 439             argadd[CLIENT_PASS_LEN], *mode_ptr, *o_mode_ptr;
 440         bool connected, set, skiponce, retval, use_servermode,
 441              is_halfop, is_op, is_admin, is_owner, is_machine, is_oper;
 442         int mode_arg, arg_arg, mode_arg_count = 0;
 443         CLIENT *client;
 444         long l;
 445         size_t len;
 446
 447         is_halfop = is_op = is_admin = is_owner = is_machine = is_oper = false;
 448
 449         if (Channel_IsModeless(Channel))
 450                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 451                                 Client_ID(Client), Channel_Name(Channel));
 452
 453         /* Mode request: let's answer it :-) */
 454         if (Req->argc <= 1)
 455                 return Channel_Mode_Answer_Request(Origin, Channel);
 456
 457         /* Check if origin is oper and opers can use mode */
 458         use_servermode = Conf_OperServerMode;
 459         if(Client_OperByMe(Client) && Conf_OperCanMode) {
 460                 is_oper = true;
 461         }
 462
 463         /* Check if client is a server/service */
 464         if(Client_Type(Client) == CLIENT_SERVER ||
 465            Client_Type(Client) == CLIENT_SERVICE) {
 466                 is_machine = true;
 467         }
 468
 469         /* Check if client is member of channel or an oper or an server/service */
 470         if(!Channel_IsMemberOf(Channel, Client) && !is_oper && !is_machine)
 471                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 472                                           Client_ID(Origin),
 473                                           Channel_Name(Channel));
 474
 475         mode_arg = 1;
 476         mode_ptr = Req->argv[mode_arg];
 477         if (Req->argc > mode_arg + 1)
 478                 arg_arg = mode_arg + 1;
 479         else
 480                 arg_arg = -1;
 481
 482         /* Initial state: set or unset modes? */
 483         skiponce = false;
 484         switch (*mode_ptr) {
 485         case '-':
 486                 set = false;
 487                 break;
 488         case '+':
 489                 set = true;
 490                 break;
 491         default:
 492                 set = true;
 493                 skiponce = true;
 494         }
 495
 496         /* Prepare reply string */
 497         strcpy(the_modes, set ? "+" : "-");
 498         the_args[0] = '\0';
 499
 500         x[1] = '\0';
 501         connected = CONNECTED;
 502         while (mode_ptr) {
 503                 if (!skiponce)
 504                         mode_ptr++;
 505                 if (!*mode_ptr) {
 506                         /* Try next argument if there's any */
 507                         if (arg_arg < 0)
 508                                 break;
 509                         if (arg_arg > mode_arg)
 510                                 mode_arg = arg_arg;
 511                         else
 512                                 mode_arg++;
 513
 514                         if (mode_arg >= Req->argc)
 515                                 break;
 516                         mode_ptr = Req->argv[mode_arg];
 517
 518                         if (Req->argc > mode_arg + 1)
 519                                 arg_arg = mode_arg + 1;
 520                         else
 521                                 arg_arg = -1;
 522                 }
 523                 skiponce = false;
 524
 525                 switch (*mode_ptr) {
 526                 case '+':
 527                 case '-':
 528                         if (((*mode_ptr == '+') && !set)
 529                             || ((*mode_ptr == '-') && set)) {
 530                                 /* Action modifier ("+"/"-") must be changed ... */
 531                                 len = strlen(the_modes) - 1;
 532                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 533                                         /* Adjust last action modifier in result */
 534                                         the_modes[len] = *mode_ptr;
 535                                 } else {
 536                                         /* Append modifier character to result string */
 537                                         x[0] = *mode_ptr;
 538                                         strlcat(the_modes, x, sizeof(the_modes));
 539                                 }
 540                                 set = *mode_ptr == '+';
 541                         }
 542                         continue;
 543                 }
 544
 545                 /* Are there arguments left? */
 546                 if (arg_arg >= Req->argc)
 547                         arg_arg = -1;
 548
 549                 if(!is_machine && !is_oper) {
 550                         o_mode_ptr = Channel_UserModes(Channel, Client);
 551                         while( *o_mode_ptr ) {
 552                                 if ( *o_mode_ptr == 'q')
 553                                         is_owner = true;
 554                                 if ( *o_mode_ptr == 'a')
 555                                         is_admin = true;
 556                                 if ( *o_mode_ptr == 'o')
 557                                         is_op = true;
 558                                 if ( *o_mode_ptr == 'h')
 559                                         is_halfop = true;
 560                                 o_mode_ptr++;
 561                         }
 562                 }
 563
 564                 /* Validate modes */
 565                 x[0] = '\0';
 566                 argadd[0] = '\0';
 567                 client = NULL;
 568                 switch (*mode_ptr) {
 569                 /* --- Channel modes --- */
 570                 case 'R': /* Registered users only */
 571                 case 's': /* Secret channel */
 572                 case 'z': /* Secure connections only */
 573                         if(!is_oper && !is_machine && !is_owner &&
 574                            !is_admin && !is_op) {
 575                                 connected = IRC_WriteStrClient(Origin,
 576                                         ERR_CHANOPRIVSNEEDED_MSG,
 577                                         Client_ID(Origin), Channel_Name(Channel));
 578                                 goto chan_exit;
 579                         }
 580                 case 'i': /* Invite only */
 581                 case 'V': /* Invite disallow */
 582                 case 'M': /* Only identified nicks can write */
 583                 case 'm': /* Moderated */
 584                 case 'n': /* Only members can write */
 585                 case 'Q': /* No kicks */
 586                 case 't': /* Topic locked */
 587                         if(is_oper || is_machine || is_owner ||
 588                            is_admin || is_op || is_halfop)
 589                                 x[0] = *mode_ptr;
 590                         else
 591                                 connected = IRC_WriteStrClient(Origin,
 592                                         ERR_CHANOPRIVSNEEDED_MSG,
 593                                         Client_ID(Origin), Channel_Name(Channel));
 594                         break;
 595                 case 'k': /* Channel key */
 596                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 597                                 goto chan_exit;
 598                         if (!set) {
 599                                 if (is_oper || is_machine || is_owner ||
 600                                     is_admin || is_op || is_halfop)
 601                                         x[0] = *mode_ptr;
 602                                 else
 603                                         connected = IRC_WriteStrClient(Origin,
 604                                                 ERR_CHANOPRIVSNEEDED_MSG,
 605                                                 Client_ID(Origin),
 606                                                 Channel_Name(Channel));
 607                                 break;
 608                         }
 609                         if (arg_arg > mode_arg) {
 610                                 if (is_oper || is_machine || is_owner ||
 611                                     is_admin || is_op || is_halfop) {
 612                                         Channel_ModeDel(Channel, 'k');
 613                                         Channel_SetKey(Channel,
 614                                                        Req->argv[arg_arg]);
 615                                         strlcpy(argadd, Channel_Key(Channel),
 616                                                 sizeof(argadd));
 617                                         x[0] = *mode_ptr;
 618                                 } else {
 619                                         connected = IRC_WriteStrClient(Origin,
 620                                                 ERR_CHANOPRIVSNEEDED_MSG,
 621                                                 Client_ID(Origin),
 622                                                 Channel_Name(Channel));
 623                                 }
 624                                 Req->argv[arg_arg][0] = '\0';
 625                                 arg_arg++;
 626                         } else {
 627 #ifdef STRICT_RFC
 628                                 /* Only send error message in "strict" mode,
 629                                  * this is how ircd2.11 and others behave ... */
 630                                 connected = IRC_WriteStrClient(Origin,
 631                                         ERR_NEEDMOREPARAMS_MSG,
 632                                         Client_ID(Origin), Req->command);
 633 #endif
 634                                 goto chan_exit;
 635                         }
 636                         break;
 637                 case 'l': /* Member limit */
 638                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 639                                 goto chan_exit;
 640                         if (!set) {
 641                                 if (is_oper || is_machine || is_owner ||
 642                                     is_admin || is_op || is_halfop)
 643                                         x[0] = *mode_ptr;
 644                                 else
 645                                         connected = IRC_WriteStrClient(Origin,
 646                                                 ERR_CHANOPRIVSNEEDED_MSG,
 647                                                 Client_ID(Origin),
 648                                                 Channel_Name(Channel));
 649                                 break;
 650                         }
 651                         if (arg_arg > mode_arg) {
 652                                 if (is_oper || is_machine || is_owner ||
 653                                     is_admin || is_op || is_halfop) {
 654                                         l = atol(Req->argv[arg_arg]);
 655                                         if (l > 0 && l < 0xFFFF) {
 656                                                 Channel_ModeDel(Channel, 'l');
 657                                                 Channel_SetMaxUsers(Channel, l);
 658                                                 snprintf(argadd, sizeof(argadd),
 659                                                          "%ld", l);
 660                                                 x[0] = *mode_ptr;
 661                                         }
 662                                 } else {
 663                                         connected = IRC_WriteStrClient(Origin,
 664                                                 ERR_CHANOPRIVSNEEDED_MSG,
 665                                                 Client_ID(Origin),
 666                                                 Channel_Name(Channel));
 667                                 }
 668                                 Req->argv[arg_arg][0] = '\0';
 669                                 arg_arg++;
 670                         } else {
 671 #ifdef STRICT_RFC
 672                                 /* Only send error message in "strict" mode,
 673                                  * this is how ircd2.11 and others behave ... */
 674                                 connected = IRC_WriteStrClient(Origin,
 675                                         ERR_NEEDMOREPARAMS_MSG,
 676                                         Client_ID(Origin), Req->command);
 677 #endif
 678                                 goto chan_exit;
 679                         }
 680                         break;
 681                 case 'O': /* IRC operators only */
 682                         if (set) {
 683                                 /* Only IRC operators are allowed to
 684                                  * set the 'O' channel mode! */
 685                                 if(is_oper || is_machine)
 686                                         x[0] = 'O';
 687                                 else
 688                                         connected = IRC_WriteStrClient(Origin,
 689                                                 ERR_NOPRIVILEGES_MSG,
 690                                                 Client_ID(Origin));
 691                         } else if(is_oper || is_machine || is_owner ||
 692                                   is_admin || is_op)
 693                                 x[0] = 'O';
 694                         else
 695                                 connected = IRC_WriteStrClient(Origin,
 696                                         ERR_CHANOPRIVSNEEDED_MSG,
 697                                         Client_ID(Origin),
 698                                         Channel_Name(Channel));
 699                         break;
 700                 case 'P': /* Persistent channel */
 701                         if (set) {
 702                                 /* Only IRC operators are allowed to
 703                                  * set the 'P' channel mode! */
 704                                 if(is_oper || is_machine)
 705                                         x[0] = 'P';
 706                                 else
 707                                         connected = IRC_WriteStrClient(Origin,
 708                                                 ERR_NOPRIVILEGES_MSG,
 709                                                 Client_ID(Origin));
 710                         } else if(is_oper || is_machine || is_owner ||
 711                                   is_admin || is_op)
 712                                 x[0] = 'P';
 713                         else
 714                                 connected = IRC_WriteStrClient(Origin,
 715                                         ERR_CHANOPRIVSNEEDED_MSG,
 716                                         Client_ID(Origin),
 717                                         Channel_Name(Channel));
 718                         break;
 719                 /* --- Channel user modes --- */
 720                 case 'q': /* Owner */
 721                 case 'a': /* Channel admin */
 722                         if(!is_oper && !is_machine && !is_owner && !is_admin) {
 723                                 connected = IRC_WriteStrClient(Origin,
 724                                         ERR_CHANOPPRIVTOOLOW_MSG,
 725                                         Client_ID(Origin),
 726                                         Channel_Name(Channel));
 727                                 goto chan_exit;
 728                         }
 729                 case 'o': /* Channel operator */
 730                         if(!is_oper && !is_machine && !is_owner &&
 731                            !is_admin && !is_op) {
 732                                 connected = IRC_WriteStrClient(Origin,
 733                                         ERR_CHANOPRIVSNEEDED_MSG,
 734                                         Client_ID(Origin),
 735                                         Channel_Name(Channel));
 736                                 goto chan_exit;
 737                         }
 738                 case 'h': /* Half Op */
 739                         if(!is_oper && !is_machine && !is_owner &&
 740                            !is_admin && !is_op) {
 741                                 connected = IRC_WriteStrClient(Origin,
 742                                         ERR_CHANOPRIVSNEEDED_MSG,
 743                                         Client_ID(Origin),
 744                                         Channel_Name(Channel));
 745                                 goto chan_exit;
 746                         }
 747                 case 'v': /* Voice */
 748                         if (arg_arg > mode_arg) {
 749                                 if (is_oper || is_machine || is_owner ||
 750                                     is_admin || is_op || is_halfop) {
 751                                         client = Client_Search(Req->argv[arg_arg]);
 752                                         if (client)
 753                                                 x[0] = *mode_ptr;
 754                                         else
 755                                                 connected = IRC_WriteStrClient(Origin,
 756                                                         ERR_NOSUCHNICK_MSG,
 757                                                         Client_ID(Origin),
 758                                                         Req->argv[arg_arg]);
 759                                 } else {
 760                                         connected = IRC_WriteStrClient(Origin,
 761                                                 ERR_CHANOPRIVSNEEDED_MSG,
 762                                                 Client_ID(Origin),
 763                                                 Channel_Name(Channel));
 764                                 }
 765                                 Req->argv[arg_arg][0] = '\0';
 766                                 arg_arg++;
 767                         } else {
 768 #ifdef STRICT_RFC
 769                                 /* Report an error to the client, when a user
 770                                  * mode should be changed but no nickname is
 771                                  * given. But don't do it when not in "strict"
 772                                  * mode, because most other servers don't do
 773                                  * it as well and some clients send "wired"
 774                                  * MODE commands like "MODE #chan -ooo nick". */
 775                                 connected = IRC_WriteStrClient(Origin,
 776                                         ERR_NEEDMOREPARAMS_MSG,
 777                                         Client_ID(Origin), Req->command);
 778 #endif
 779                                 goto chan_exit;
 780                         }
 781                         break;
 782                 /* --- Channel lists --- */
 783                 case 'I': /* Invite lists */
 784                 case 'b': /* Ban lists */
 785                 case 'e': /* Channel exception lists */
 786                         if (Mode_Limit_Reached(Client, mode_arg_count++))
 787                                 goto chan_exit;
 788                         if (arg_arg > mode_arg) {
 789                                 /* modify list */
 790                                 if (is_oper || is_machine || is_owner ||
 791                                     is_admin || is_op || is_halfop) {
 792                                         connected = set
 793                                            ? Add_To_List(*mode_ptr, Origin,
 794                                                 Client, Channel,
 795                                                 Req->argv[arg_arg])
 796                                            : Del_From_List(*mode_ptr, Origin,
 797                                                 Client, Channel,
 798                                                 Req->argv[arg_arg]);
 799                                 } else {
 800                                         connected = IRC_WriteStrClient(Origin,
 801                                                 ERR_CHANOPRIVSNEEDED_MSG,
 802                                                 Client_ID(Origin),
 803                                                 Channel_Name(Channel));
 804                                 }
 805                                 Req->argv[arg_arg][0] = '\0';
 806                                 arg_arg++;
 807                         } else {
 808                                 switch (*mode_ptr) {
 809                                 case 'I':
 810                                         Channel_ShowInvites(Origin, Channel);
 811                                         break;
 812                                 case 'b':
 813                                         Channel_ShowBans(Origin, Channel);
 814                                         break;
 815                                 case 'e':
 816                                         Channel_ShowExcepts(Origin, Channel);
 817                                         break;
 818                                 }
 819                         }
 820                         break;
 821                 default:
 822                         if (Client_Type(Client) != CLIENT_SERVER) {
 823                                 Log(LOG_DEBUG,
 824                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 825                                     set ? '+' : '-', *mode_ptr,
 826                                     Client_ID(Origin), Channel_Name(Channel));
 827                                 connected = IRC_WriteStrClient(Origin,
 828                                         ERR_UNKNOWNMODE_MSG,
 829                                         Client_ID(Origin), *mode_ptr,
 830                                         Channel_Name(Channel));
 831                                 x[0] = '\0';
 832                         } else {
 833                                 Log(LOG_DEBUG,
 834                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 835                                     set ? '+' : '-', *mode_ptr,
 836                                     Client_ID(Origin), Channel_Name(Channel));
 837                                 x[0] = *mode_ptr;
 838                         }
 839                 }
 840
 841                 if (!connected)
 842                         break;
 843
 844                 /* Is there a valid mode change? */
 845                 if (!x[0])
 846                         continue;
 847
 848                 /* Validate target client */
 849                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 850                         if (!IRC_WriteStrClient
 851                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 852                              Client_ID(Origin), Client_ID(client),
 853                              Channel_Name(Channel)))
 854                                 break;
 855
 856                         continue;
 857                 }
 858
 859                 if (client) {
 860                         /* Channel-User-Mode */
 861                         retval = set
 862                                ? Channel_UserModeAdd(Channel, client, x[0])
 863                                : Channel_UserModeDel(Channel, client, x[0]);
 864                         if (retval) {
 865                                 strlcat(the_args, " ", sizeof(the_args));
 866                                 strlcat(the_args, Client_ID(client),
 867                                         sizeof(the_args));
 868                                 strlcat(the_modes, x, sizeof(the_modes));
 869                                 LogDebug
 870                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 871                                      Client_Mask(client), Channel_Name(Channel),
 872                                      Channel_UserModes(Channel, client));
 873                         }
 874                 } else {
 875                         /* Channel-Mode */
 876                         retval = set
 877                                ? Channel_ModeAdd(Channel, x[0])
 878                                : Channel_ModeDel(Channel, x[0]);
 879                         if (retval) {
 880                                 strlcat(the_modes, x, sizeof(the_modes));
 881                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 882                                          Channel_Name(Channel),
 883                                          Channel_Modes(Channel));
 884                         }
 885                 }
 886
 887                 /* Are there additional arguments to add? */
 888                 if (argadd[0]) {
 889                         strlcat(the_args, " ", sizeof(the_args));
 890                         strlcat(the_args, argadd, sizeof(the_args));
 891                 }
 892         }
 893
 894       chan_exit:
 895         /* Are there changed modes? */
 896         if (the_modes[1]) {
 897                 /* Clean up mode string */
 898                 len = strlen(the_modes) - 1;
 899                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 900                         the_modes[len] = '\0';
 901
 902                 if (Client_Type(Client) == CLIENT_SERVER) {
 903                         /* MODE requests for local channels from other servers
 904                          * are definitely invalid! */
 905                         if (Channel_IsLocal(Channel)) {
 906                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 907                                 return CONNECTED;
 908                         }
 909
 910                         /* Forward mode changes to channel users and all the
 911                          * other remote servers: */
 912                         IRC_WriteStrServersPrefix(Client, Origin,
 913                                 "MODE %s %s%s", Channel_Name(Channel),
 914                                 the_modes, the_args);
 915                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 916                                 false, "MODE %s %s%s", Channel_Name(Channel),
 917                                 the_modes, the_args);
 918                 } else {
 919                         if (use_servermode)
 920                                 Origin = Client_ThisServer();
 921                         /* Send reply to client and inform other servers and channel users */
 922                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 923                                         "MODE %s %s%s", Channel_Name(Channel),
 924                                         the_modes, the_args);
 925                         /* Only forward requests for non-local channels */
 926                         if (!Channel_IsLocal(Channel))
 927                                 IRC_WriteStrServersPrefix(Client, Origin,
 928                                         "MODE %s %s%s", Channel_Name(Channel),
 929                                         the_modes, the_args);
 930                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 931                                 false, "MODE %s %s%s", Channel_Name(Channel),
 932                                 the_modes, the_args);
 933                 }
 934         }
 935
 936         IRC_SetPenalty(Client, 1);
 937         return connected;
 938 } /* Channel_Mode */
 939
 940 /**
 941  * Handler for the IRC "AWAY" command.
 942  *
 943  * @param Client The client from which this command has been received.
 944  * @param Req Request structure with prefix and all parameters.
 945  * @return CONNECTED or DISCONNECTED.
 946  */
 947 GLOBAL bool
 948 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 949 {
 950         assert (Client != NULL);
 951         assert (Req != NULL);
 952
 953         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
 954
 955         if (Req->argc == 1 && Req->argv[0][0]) {
 956                 Client_SetAway(Client, Req->argv[0]);
 957                 Client_ModeAdd(Client, 'a');
 958                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :+a",
 959                                           Client_ID( Client));
 960                 return IRC_WriteStrClient(Client, RPL_NOWAWAY_MSG,
 961                                           Client_ID( Client));
 962         } else {
 963                 Client_ModeDel(Client, 'a');
 964                 IRC_WriteStrServersPrefix(Client, Client, "MODE %s :-a",
 965                                           Client_ID( Client));
 966                 return IRC_WriteStrClient(Client, RPL_UNAWAY_MSG,
 967                                           Client_ID( Client));
 968         }
 969 } /* IRC_AWAY */
 970
 971 /**
 972  * Add entries to channel invite, ban and exception lists.
 973  *
 974  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
 975  * @param Prefix The originator of the command.
 976  * @param Client The sender of the command.
 977  * @param Channel The channel of which the list should be modified.
 978  * @param Pattern The pattern to add to the list.
 979  * @return CONNECTED or DISCONNECTED.
 980  */
 981 static bool
 982 Add_To_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
 983             const char *Pattern)
 984 {
 985         char mask[MASK_LEN];
 986         struct list_head *list = NULL;
 987         long int current_count;
 988
 989         assert(Client != NULL);
 990         assert(Channel != NULL);
 991         assert(Pattern != NULL);
 992         assert(what == 'I' || what == 'b' || what == 'e');
 993
 994         Lists_MakeMask(Pattern, mask, sizeof(mask));
 995         current_count = Lists_Count(Channel_GetListInvites(Channel))
 996                         + Lists_Count(Channel_GetListExcepts(Channel))
 997                         + Lists_Count(Channel_GetListBans(Channel));
 998
 999         switch(what) {
1000                 case 'I':
1001                         list = Channel_GetListInvites(Channel);
1002                         break;
1003                 case 'b':
1004                         list = Channel_GetListBans(Channel);
1005                         break;
1006                 case 'e':
1007                         list = Channel_GetListExcepts(Channel);
1008                         break;
1009         }
1010
1011         if (Lists_CheckDupeMask(list, mask))
1012                 return CONNECTED;
1013         if (Client_Type(Client) == CLIENT_USER &&
1014             current_count >= MAX_HNDL_CHANNEL_LISTS)
1015                 return IRC_WriteStrClient(Client, ERR_LISTFULL_MSG,
1016                                           Client_ID(Client),
1017                                           Channel_Name(Channel), mask,
1018                                           MAX_HNDL_CHANNEL_LISTS);
1019
1020         switch (what) {
1021                 case 'I':
1022                         if (!Channel_AddInvite(Channel, mask, false))
1023                                 return CONNECTED;
1024                         break;
1025                 case 'b':
1026                         if (!Channel_AddBan(Channel, mask))
1027                                 return CONNECTED;
1028                         break;
1029                 case 'e':
1030                         if (!Channel_AddExcept(Channel, mask))
1031                                 return CONNECTED;
1032                         break;
1033         }
1034         return Send_ListChange(true, what, Prefix, Client, Channel, mask);
1035 }
1036
1037 /**
1038  * Delete entries from channel invite, ban and exeption lists.
1039  *
1040  * @param what Can be 'I' for invite, 'b' for ban, and 'e' for exception list.
1041  * @param Prefix The originator of the command.
1042  * @param Client The sender of the command.
1043  * @param Channel The channel of which the list should be modified.
1044  * @param Pattern The pattern to add to the list.
1045  * @return CONNECTED or DISCONNECTED.
1046  */
1047 static bool
1048 Del_From_List(char what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel,
1049               const char *Pattern)
1050 {
1051         char mask[MASK_LEN];
1052         struct list_head *list = NULL;
1053
1054         assert(Client != NULL);
1055         assert(Channel != NULL);
1056         assert(Pattern != NULL);
1057         assert(what == 'I' || what == 'b' || what == 'e');
1058
1059         Lists_MakeMask(Pattern, mask, sizeof(mask));
1060
1061         switch (what) {
1062                 case 'I':
1063                         list = Channel_GetListInvites(Channel);
1064                         break;
1065                 case 'b':
1066                         list = Channel_GetListBans(Channel);
1067                         break;
1068                 case 'e':
1069                         list = Channel_GetListExcepts(Channel);
1070                         break;
1071         }
1072
1073         if (!Lists_CheckDupeMask(list, mask))
1074                 return CONNECTED;
1075         Lists_Del(list, mask);
1076
1077         return Send_ListChange(false, what, Prefix, Client, Channel, mask);
1078 }
1079
1080 /**
1081  * Send information about changed channel invite/ban/exception lists to clients.
1082  *
1083  * @param IsAdd true if the list item has been added, false otherwise.
1084  * @param ModeChar The mode to use (e. g. 'b' or 'I')
1085  * @param Prefix The originator of the mode list change.
1086  * @param Client The sender of the command.
1087  * @param Channel The channel of which the list has been modified.
1088  * @param Mask The mask which has been added or removed.
1089  * @return CONNECTED or DISCONNECTED.
1090  */
1091 static bool
1092 Send_ListChange(const bool IsAdd, const char ModeChar, CLIENT *Prefix,
1093                 CLIENT *Client, CHANNEL *Channel, const char *Mask)
1094 {
1095         bool ok = true;
1096
1097         /* Send confirmation to the client */
1098         if (Client_Type(Client) == CLIENT_USER)
1099                 ok = IRC_WriteStrClientPrefix(Client, Prefix, "MODE %s %c%c %s",
1100                                               Channel_Name(Channel),
1101                                               IsAdd ? '+' : '-',
1102                                               ModeChar, Mask);
1103
1104         /* to other servers */
1105         IRC_WriteStrServersPrefix(Client, Prefix, "MODE %s %c%c %s",
1106                                   Channel_Name(Channel), IsAdd ? '+' : '-',
1107                                   ModeChar, Mask);
1108
1109         /* and local users in channel */
1110         IRC_WriteStrChannelPrefix(Client, Channel, Prefix, false,
1111                                   "MODE %s %c%c %s", Channel_Name(Channel),
1112                                   IsAdd ? '+' : '-', ModeChar, Mask );
1113
1114         return ok;
1115 } /* Send_ListChange */
1116
1117 /* -eof- */