src/ngircd/irc-mode.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for mode changes (like MODE, AWAY, etc.)
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "irc-write.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "parse.h"
  32 #include "messages.h"
  33 #include "conf.h"
  34
  35 #include "exp.h"
  36 #include "irc-mode.h"
  37
  38
  39 static bool Client_Mode PARAMS(( CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  40         CLIENT *Target ));
  41 static bool Channel_Mode PARAMS(( CLIENT *Client, REQUEST *Req, CLIENT *Origin,
  42         CHANNEL *Channel ));
  43
  44 static bool Add_Ban_Invite PARAMS((int what, CLIENT *Prefix, CLIENT *Client,
  45         CHANNEL *Channel, const char *Pattern));
  46 static bool Del_Ban_Invite PARAMS((int what, CLIENT *Prefix, CLIENT *Client,
  47         CHANNEL *Channel, const char *Pattern));
  48
  49 static bool Send_ListChange PARAMS((const char *Mode, CLIENT *Prefix,
  50         CLIENT *Client, CHANNEL *Channel, const char *Mask));
  51
  52
  53 /**
  54  * Handler for the IRC "MODE" command.
  55  *
  56  * See RFC 2812 section 3.1.5 ("user mode message") and section 3.2.3
  57  * ("channel mode message"), and RFC 2811 section 4 ("channel modes").
  58  *
  59  * @param Client        The client from which this command has been received.
  60  * @param Req           Request structure with prefix and all parameters.
  61  * @returns             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         /* No parameters? */
  73         if (Req->argc < 1)
  74                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  75                                           Client_ID(Client), Req->command);
  76
  77         /* Origin for answers */
  78         if (Client_Type(Client) == CLIENT_SERVER) {
  79                 origin = Client_Search(Req->prefix);
  80                 if (!origin)
  81                         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
  82                                                   Client_ID(Client),
  83                                                   Req->prefix);
  84         } else
  85                 origin = Client;
  86
  87         /* Channel or user mode? */
  88         cl = NULL; chan = NULL;
  89         if (Client_IsValidNick(Req->argv[0]))
  90                 cl = Client_Search(Req->argv[0]);
  91         if (Channel_IsValidName(Req->argv[0]))
  92                 chan = Channel_Search(Req->argv[0]);
  93
  94         if (cl)
  95                 return Client_Mode(Client, Req, origin, cl);
  96         if (chan)
  97                 return Channel_Mode(Client, Req, origin, chan);
  98
  99         /* No target found! */
 100         return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 101                         Client_ID(Client), Req->argv[0]);
 102 } /* IRC_MODE */
 103
 104
 105 /**
 106  * Handle client mode requests
 107  *
 108  * @param Client        The client from which this command has been received.
 109  * @param Req           Request structure with prefix and all parameters.
 110  * @param Origin        The originator of the MODE command (prefix).
 111  * @param Target        The target (client) of this MODE command.
 112  * @returns             CONNECTED or DISCONNECTED.
 113  */
 114 static bool
 115 Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 116 {
 117         char the_modes[COMMAND_LEN], x[2], *mode_ptr;
 118         bool ok, set;
 119         int mode_arg;
 120         size_t len;
 121
 122         /* Is the client allowed to request or change the modes? */
 123         if (Client_Type(Client) == CLIENT_USER) {
 124                 /* Users are only allowed to manipulate their own modes! */
 125                 if (Target != Client)
 126                         return IRC_WriteStrClient(Client,
 127                                                   ERR_USERSDONTMATCH_MSG,
 128                                                   Client_ID(Client));
 129         }
 130
 131         /* Mode request: let's answer it :-) */
 132         if (Req->argc == 1)
 133                 return IRC_WriteStrClient(Origin, RPL_UMODEIS_MSG,
 134                                           Client_ID(Origin),
 135                                           Client_Modes(Target));
 136
 137         mode_arg = 1;
 138         mode_ptr = Req->argv[mode_arg];
 139
 140         /* Initial state: set or unset modes? */
 141         if (*mode_ptr == '+') {
 142                 set = true;
 143                 strcpy(the_modes, "+");
 144         } else if (*mode_ptr == '-') {
 145                 set = false;
 146                 strcpy(the_modes, "-");
 147         } else
 148                 return IRC_WriteStrClient(Origin, ERR_UMODEUNKNOWNFLAG_MSG,
 149                                           Client_ID(Origin));
 150
 151         x[1] = '\0';
 152         ok = CONNECTED;
 153         while (mode_ptr) {
 154                 mode_ptr++;
 155                 if (!*mode_ptr) {
 156                         /* Try next argument if there's any */
 157                         mode_arg++;
 158                         if (mode_arg < Req->argc)
 159                                 mode_ptr = Req->argv[mode_arg];
 160                         else
 161                                 break;
 162                 }
 163
 164                 switch(*mode_ptr) {
 165                   case '+':
 166                   case '-':
 167                         if ((*mode_ptr == '+' && !set)
 168                             || (*mode_ptr == '-' && set)) {
 169                                 /* Action modifier ("+"/"-") must be changed */
 170                                 len = strlen(the_modes) - 1;
 171                                 if (the_modes[len] == '+'
 172                                     || the_modes[len] == '-') {
 173                                         /* Last character in the "result
 174                                          * string" was an "action", so just
 175                                          * overwrite it with the new action */
 176                                         the_modes[len] = *mode_ptr;
 177                                 } else {
 178                                         /* Append new modifier character to
 179                                          * the resulting mode string */
 180                                         x[0] = *mode_ptr;
 181                                         strlcat(the_modes, x,
 182                                                 sizeof(the_modes));
 183                                 }
 184                                 if (*mode_ptr == '+')
 185                                         set = true;
 186                                 else
 187                                         set = false;
 188                         }
 189                         continue;
 190                 }
 191
 192                 /* Validate modes */
 193                 x[0] = '\0';
 194                 switch (*mode_ptr) {
 195                 case 'i': /* Invisible */
 196                 case 's': /* Server messages */
 197                 case 'w': /* Wallops messages */
 198                         x[0] = *mode_ptr;
 199                         break;
 200                 case 'a': /* Away */
 201                         if (Client_Type(Client) == CLIENT_SERVER) {
 202                                 x[0] = 'a';
 203                                 Client_SetAway(Origin, DEFAULT_AWAY_MSG);
 204                         } else
 205                                 ok = IRC_WriteStrClient(Origin,
 206                                                         ERR_NOPRIVILEGES_MSG,
 207                                                         Client_ID(Origin));
 208                         break;
 209                 case 'c': /* Receive connect notices
 210                            * (only settable by IRC operators!) */
 211                         if (!set || Client_Type(Client) == CLIENT_SERVER
 212                             || Client_OperByMe(Origin))
 213                                 x[0] = 'c';
 214                         else
 215                                 ok = IRC_WriteStrClient(Origin,
 216                                                         ERR_NOPRIVILEGES_MSG,
 217                                                         Client_ID(Origin));
 218                         break;
 219                 case 'o': /* IRC operator (only unsettable!) */
 220                         if (!set || Client_Type(Client) == CLIENT_SERVER) {
 221                                 Client_SetOperByMe(Target, false);
 222                                 x[0] = 'o';
 223                         } else
 224                                 ok = IRC_WriteStrClient(Origin,
 225                                                         ERR_NOPRIVILEGES_MSG,
 226                                                         Client_ID(Origin));
 227                         break;
 228                 case 'r': /* Restricted (only settable) */
 229                         if (set || Client_Type(Client) == CLIENT_SERVER)
 230                                 x[0] = 'r';
 231                         else
 232                                 ok = IRC_WriteStrClient(Origin,
 233                                                         ERR_RESTRICTED_MSG,
 234                                                         Client_ID(Origin));
 235                         break;
 236                 case 'x': /* Cloak hostname */
 237                         if (Client_HasMode(Client, 'r'))
 238                                 ok = IRC_WriteStrClient(Origin,
 239                                                         ERR_RESTRICTED_MSG,
 240                                                         Client_ID(Origin));
 241                         else
 242                                 x[0] = 'x';
 243                         break;
 244                 default:
 245                         if (Client_Type(Client) != CLIENT_SERVER) {
 246                                 Log(LOG_DEBUG,
 247                                     "Unknown mode \"%c%c\" from \"%s\"!?",
 248                                     set ? '+' : '-', *mode_ptr,
 249                                     Client_ID(Origin));
 250                                 ok = IRC_WriteStrClient(Origin,
 251                                                         ERR_UMODEUNKNOWNFLAG2_MSG,
 252                                                         Client_ID(Origin),
 253                                                         set ? '+' : '-',
 254                                                         *mode_ptr);
 255                                 x[0] = '\0';
 256                         } else {
 257                                 Log(LOG_DEBUG,
 258                                     "Handling unknown mode \"%c%c\" from \"%s\" for \"%s\" ...",
 259                                     set ? '+' : '-', *mode_ptr,
 260                                     Client_ID(Origin), Client_ID(Target));
 261                                 x[0] = *mode_ptr;
 262                         }
 263                 }
 264
 265                 if (!ok)
 266                         break;
 267
 268                 /* Is there a valid mode change? */
 269                 if (!x[0])
 270                         continue;
 271
 272                 if (set) {
 273                         if (Client_ModeAdd(Target, x[0]))
 274                                 strlcat(the_modes, x, sizeof(the_modes));
 275                 } else {
 276                         if (Client_ModeDel(Target, x[0]))
 277                                 strlcat(the_modes, x, sizeof(the_modes));
 278                 }
 279         }
 280
 281         /* Are there changed modes? */
 282         if (the_modes[1]) {
 283                 /* Remove needless action modifier characters */
 284                 len = strlen(the_modes) - 1;
 285                 if (the_modes[len] == '+' || the_modes[len] == '-')
 286                         the_modes[len] = '\0';
 287
 288                 if (Client_Type(Client) == CLIENT_SERVER) {
 289                         /* Forward modes to other servers */
 290                         if (Client_Conn(Target) != NONE) {
 291                                 /* Remote server (service?) changed modes
 292                                  * for one of our clients. Inform it! */
 293                                 IRC_WriteStrClientPrefix(Target, Origin,
 294                                                          "MODE %s :%s",
 295                                                          Client_ID(Target),
 296                                                          the_modes);
 297                         }
 298                         IRC_WriteStrServersPrefix(Client, Origin,
 299                                                   "MODE %s :%s",
 300                                                   Client_ID(Target),
 301                                                   the_modes);
 302                 } else {
 303                         /* Send reply to client and inform other servers */
 304                         ok = IRC_WriteStrClientPrefix(Client, Origin,
 305                                                       "MODE %s :%s",
 306                                                       Client_ID(Target),
 307                                                       the_modes);
 308                         IRC_WriteStrServersPrefix(Client, Origin,
 309                                                   "MODE %s :%s",
 310                                                   Client_ID(Target),
 311                                                   the_modes);
 312                 }
 313                 LogDebug("%s \"%s\": Mode change, now \"%s\".",
 314                          Client_TypeText(Target), Client_Mask(Target),
 315                          Client_Modes(Target));
 316         }
 317
 318         IRC_SetPenalty(Client, 1);
 319         return ok;
 320 } /* Client_Mode */
 321
 322
 323 static bool
 324 Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
 325 {
 326         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
 327         const char *mode_ptr;
 328
 329         /* Member or not? -- That's the question! */
 330         if (!Channel_IsMemberOf(Channel, Origin))
 331                 return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 332                         Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));
 333
 334         /* The sender is a member: generate extended reply */
 335         strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
 336         mode_ptr = the_modes;
 337         the_args[0] = '\0';
 338
 339         while(*mode_ptr) {
 340                 switch(*mode_ptr) {
 341                 case 'l':
 342                         snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
 343                         strlcat(the_args, argadd, sizeof(the_args));
 344                         break;
 345                 case 'k':
 346                         strlcat(the_args, " ", sizeof(the_args));
 347                         strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
 348                         break;
 349                 }
 350                 mode_ptr++;
 351         }
 352         if (the_args[0])
 353                 strlcat(the_modes, the_args, sizeof(the_modes));
 354
 355         if (!IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
 356                                 Client_ID(Origin), Channel_Name(Channel),
 357                                 the_modes))
 358                 return DISCONNECTED;
 359 #ifndef STRICT_RFC
 360         if (!IRC_WriteStrClient(Origin, RPL_CREATIONTIME_MSG,
 361                                   Client_ID(Origin), Channel_Name(Channel),
 362                                   Channel_CreationTime(Channel)))
 363                 return DISCONNECTED;
 364 #endif
 365         return CONNECTED;
 366 }
 367
 368
 369 /**
 370  * Handle channel mode and channel-user mode changes
 371  */
 372 static bool
 373 Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 374 {
 375         char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 376             argadd[CLIENT_PASS_LEN], *mode_ptr;
 377         bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
 378         int mode_arg, arg_arg, mode_arg_count = 0;
 379         CLIENT *client;
 380         long l;
 381         size_t len;
 382
 383         if (Channel_IsModeless(Channel))
 384                 return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 385                                 Client_ID(Client), Channel_Name(Channel));
 386
 387         /* Mode request: let's answer it :-) */
 388         if (Req->argc <= 1)
 389                 return Channel_Mode_Answer_Request(Origin, Channel);
 390
 391         Channel_CheckAdminRights(Channel, Client, Origin,
 392                                  &onchannel, &modeok, &use_servermode);
 393
 394         if (!onchannel && !modeok)
 395                 return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
 396                                           Client_ID(Origin),
 397                                           Channel_Name(Channel));
 398
 399         mode_arg = 1;
 400         mode_ptr = Req->argv[mode_arg];
 401         if (Req->argc > mode_arg + 1)
 402                 arg_arg = mode_arg + 1;
 403         else
 404                 arg_arg = -1;
 405
 406         /* Initial state: set or unset modes? */
 407         skiponce = false;
 408         switch (*mode_ptr) {
 409         case '-':
 410                 set = false;
 411                 break;
 412         case '+':
 413                 set = true;
 414                 break;
 415         default:
 416                 set = true;
 417                 skiponce = true;
 418         }
 419
 420         /* Prepare reply string */
 421         strcpy(the_modes, set ? "+" : "-");
 422         the_args[0] = '\0';
 423
 424         x[1] = '\0';
 425         connected = CONNECTED;
 426         while (mode_ptr) {
 427                 if (!skiponce)
 428                         mode_ptr++;
 429                 if (!*mode_ptr) {
 430                         /* Try next argument if there's any */
 431                         if (arg_arg < 0)
 432                                 break;
 433                         if (arg_arg > mode_arg)
 434                                 mode_arg = arg_arg;
 435                         else
 436                                 mode_arg++;
 437
 438                         if (mode_arg >= Req->argc)
 439                                 break;
 440                         mode_ptr = Req->argv[mode_arg];
 441
 442                         if (Req->argc > mode_arg + 1)
 443                                 arg_arg = mode_arg + 1;
 444                         else
 445                                 arg_arg = -1;
 446                 }
 447                 skiponce = false;
 448
 449                 switch (*mode_ptr) {
 450                 case '+':
 451                 case '-':
 452                         if (((*mode_ptr == '+') && !set)
 453                             || ((*mode_ptr == '-') && set)) {
 454                                 /* Action modifier ("+"/"-") must be changed ... */
 455                                 len = strlen(the_modes) - 1;
 456                                 if (the_modes[len] == '+' || the_modes[len] == '-') {
 457                                         /* Adjust last action modifier in result */
 458                                         the_modes[len] = *mode_ptr;
 459                                 } else {
 460                                         /* Append modifier character to result string */
 461                                         x[0] = *mode_ptr;
 462                                         strlcat(the_modes, x, sizeof(the_modes));
 463                                 }
 464                                 set = *mode_ptr == '+';
 465                         }
 466                         continue;
 467                 }
 468
 469                 /* Are there arguments left? */
 470                 if (arg_arg >= Req->argc)
 471                         arg_arg = -1;
 472
 473                 /* Validate modes */
 474                 x[0] = '\0';
 475                 argadd[0] = '\0';
 476                 client = NULL;
 477                 switch (*mode_ptr) {
 478                 /* --- Channel modes --- */
 479                 case 'i': /* Invite only */
 480                 case 'm': /* Moderated */
 481                 case 'n': /* Only members can write */
 482                 case 'R': /* Registered users only */
 483                 case 's': /* Secret channel */
 484                 case 't': /* Topic locked */
 485                 case 'z': /* Secure connections only */
 486                         if (modeok)
 487                                 x[0] = *mode_ptr;
 488                         else
 489                                 connected = IRC_WriteStrClient(Origin,
 490                                         ERR_CHANOPRIVSNEEDED_MSG,
 491                                         Client_ID(Origin), Channel_Name(Channel));
 492                         break;
 493                 case 'k': /* Channel key */
 494                         if (mode_arg_count++ >= MAX_HNDL_MODES_ARG)
 495                                 goto chan_exit;
 496                         if (!set) {
 497                                 if (modeok)
 498                                         x[0] = *mode_ptr;
 499                                 else
 500                                         connected = IRC_WriteStrClient(Origin,
 501                                                 ERR_CHANOPRIVSNEEDED_MSG,
 502                                                 Client_ID(Origin),
 503                                                 Channel_Name(Channel));
 504                                 break;
 505                         }
 506                         if (arg_arg > mode_arg) {
 507                                 if (modeok) {
 508                                         Channel_ModeDel(Channel, 'k');
 509                                         Channel_SetKey(Channel,
 510                                                        Req->argv[arg_arg]);
 511                                         strlcpy(argadd, Channel_Key(Channel),
 512                                                 sizeof(argadd));
 513                                         x[0] = *mode_ptr;
 514                                 } else {
 515                                         connected = IRC_WriteStrClient(Origin,
 516                                                 ERR_CHANOPRIVSNEEDED_MSG,
 517                                                 Client_ID(Origin),
 518                                                 Channel_Name(Channel));
 519                                 }
 520                                 Req->argv[arg_arg][0] = '\0';
 521                                 arg_arg++;
 522                         } else {
 523                                 connected = IRC_WriteStrClient(Origin,
 524                                         ERR_NEEDMOREPARAMS_MSG,
 525                                         Client_ID(Origin), Req->command);
 526                                 goto chan_exit;
 527                         }
 528                         break;
 529                 case 'l': /* Member limit */
 530                         if (mode_arg_count++ >= MAX_HNDL_MODES_ARG)
 531                                 goto chan_exit;
 532                         if (!set) {
 533                                 if (modeok)
 534                                         x[0] = *mode_ptr;
 535                                 else
 536                                         connected = IRC_WriteStrClient(Origin,
 537                                                 ERR_CHANOPRIVSNEEDED_MSG,
 538                                                 Client_ID(Origin),
 539                                                 Channel_Name(Channel));
 540                                 break;
 541                         }
 542                         if (arg_arg > mode_arg) {
 543                                 if (modeok) {
 544                                         l = atol(Req->argv[arg_arg]);
 545                                         if (l > 0 && l < 0xFFFF) {
 546                                                 Channel_ModeDel(Channel, 'l');
 547                                                 Channel_SetMaxUsers(Channel, l);
 548                                                 snprintf(argadd, sizeof(argadd),
 549                                                          "%ld", l);
 550                                                 x[0] = *mode_ptr;
 551                                         }
 552                                 } else {
 553                                         connected = IRC_WriteStrClient(Origin,
 554                                                 ERR_CHANOPRIVSNEEDED_MSG,
 555                                                 Client_ID(Origin),
 556                                                 Channel_Name(Channel));
 557                                 }
 558                                 Req->argv[arg_arg][0] = '\0';
 559                                 arg_arg++;
 560                         } else {
 561                                 connected = IRC_WriteStrClient(Origin,
 562                                         ERR_NEEDMOREPARAMS_MSG,
 563                                         Client_ID(Origin), Req->command);
 564                                 goto chan_exit;
 565                         }
 566                         break;
 567                 case 'O': /* IRC operators only */
 568                         if (modeok) {
 569                                 /* Only IRC operators are allowed to
 570                                  * set the 'O' channel mode! */
 571                                 if (set && !(Client_OperByMe(Client)
 572                                     || Client_Type(Client) == CLIENT_SERVER))
 573                                         connected = IRC_WriteStrClient(Origin,
 574                                                 ERR_NOPRIVILEGES_MSG,
 575                                                 Client_ID(Origin));
 576                                 else
 577                                         x[0] = 'O';
 578                         } else
 579                                 connected = IRC_WriteStrClient(Origin,
 580                                                 ERR_CHANOPRIVSNEEDED_MSG,
 581                                                 Client_ID(Origin),
 582                                                 Channel_Name(Channel));
 583                                 break;
 584                 case 'P': /* Persistent channel */
 585                         if (modeok) {
 586                                 /* Only IRC operators are allowed to
 587                                  * set the 'P' channel mode! */
 588                                 if (set && !(Client_OperByMe(Client)
 589                                     || Client_Type(Client) == CLIENT_SERVER))
 590                                         connected = IRC_WriteStrClient(Origin,
 591                                                 ERR_NOPRIVILEGES_MSG,
 592                                                 Client_ID(Origin));
 593                                 else
 594                                         x[0] = 'P';
 595                         } else
 596                                 connected = IRC_WriteStrClient(Origin,
 597                                         ERR_CHANOPRIVSNEEDED_MSG,
 598                                         Client_ID(Origin),
 599                                         Channel_Name(Channel));
 600                         break;
 601                 /* --- Channel user modes --- */
 602                 case 'a':
 603                 case 'h':
 604                 case 'q':
 605                         if (Client_Type(Client) != CLIENT_SERVER) {
 606                                 connected = IRC_WriteStrClient(Origin,
 607                                         ERR_CHANOPRIVSNEEDED_MSG,
 608                                         Client_ID(Origin),
 609                                         Channel_Name(Channel));
 610                                 goto chan_exit;
 611                         }
 612                 case 'o': /* Channel operator */
 613                 case 'v': /* Voice */
 614                         if (arg_arg > mode_arg) {
 615                                 if (modeok) {
 616                                         client = Client_Search(Req->argv[arg_arg]);
 617                                         if (client)
 618                                                 x[0] = *mode_ptr;
 619                                         else
 620                                                 connected = IRC_WriteStrClient(Client,
 621                                                         ERR_NOSUCHNICK_MSG,
 622                                                         Client_ID(Client),
 623                                                         Req->argv[arg_arg]);
 624                                 } else {
 625                                         connected = IRC_WriteStrClient(Origin,
 626                                                 ERR_CHANOPRIVSNEEDED_MSG,
 627                                                 Client_ID(Origin),
 628                                                 Channel_Name(Channel));
 629                                 }
 630                                 Req->argv[arg_arg][0] = '\0';
 631                                 arg_arg++;
 632                         } else {
 633                                 connected = IRC_WriteStrClient(Origin,
 634                                         ERR_NEEDMOREPARAMS_MSG,
 635                                         Client_ID(Origin), Req->command);
 636                                 goto chan_exit;
 637                         }
 638                         break;
 639                 /* --- Channel lists --- */
 640                 case 'I': /* Invite lists */
 641                 case 'b': /* Ban lists */
 642                         if (mode_arg_count++ >= MAX_HNDL_MODES_ARG)
 643                                 goto chan_exit;
 644                         if (arg_arg > mode_arg) {
 645                                 /* modify list */
 646                                 if (modeok) {
 647                                         connected = set
 648                                            ? Add_Ban_Invite(*mode_ptr, Origin,
 649                                                 Client, Channel,
 650                                                 Req->argv[arg_arg])
 651                                            : Del_Ban_Invite(*mode_ptr, Origin,
 652                                                 Client, Channel,
 653                                                 Req->argv[arg_arg]);
 654                                 } else {
 655                                         connected = IRC_WriteStrClient(Origin,
 656                                                 ERR_CHANOPRIVSNEEDED_MSG,
 657                                                 Client_ID(Origin),
 658                                                 Channel_Name(Channel));
 659                                 }
 660                                 Req->argv[arg_arg][0] = '\0';
 661                                 arg_arg++;
 662                         } else {
 663                                 if (*mode_ptr == 'I')
 664                                         Channel_ShowInvites(Origin, Channel);
 665                                 else
 666                                         Channel_ShowBans(Origin, Channel);
 667                         }
 668                         break;
 669                 default:
 670                         if (Client_Type(Client) != CLIENT_SERVER) {
 671                                 Log(LOG_DEBUG,
 672                                     "Unknown mode \"%c%c\" from \"%s\" on %s!?",
 673                                     set ? '+' : '-', *mode_ptr,
 674                                     Client_ID(Origin), Channel_Name(Channel));
 675                                 connected = IRC_WriteStrClient(Origin,
 676                                         ERR_UNKNOWNMODE_MSG,
 677                                         Client_ID(Origin), *mode_ptr,
 678                                         Channel_Name(Channel));
 679                                 x[0] = '\0';
 680                         } else {
 681                                 Log(LOG_DEBUG,
 682                                     "Handling unknown mode \"%c%c\" from \"%s\" on %s ...",
 683                                     set ? '+' : '-', *mode_ptr,
 684                                     Client_ID(Origin), Channel_Name(Channel));
 685                                 x[0] = *mode_ptr;
 686                         }
 687                 }
 688
 689                 if (!connected)
 690                         break;
 691
 692                 /* Is there a valid mode change? */
 693                 if (!x[0])
 694                         continue;
 695
 696                 /* Validate target client */
 697                 if (client && (!Channel_IsMemberOf(Channel, client))) {
 698                         if (!IRC_WriteStrClient
 699                             (Origin, ERR_USERNOTINCHANNEL_MSG,
 700                              Client_ID(Origin), Client_ID(client),
 701                              Channel_Name(Channel)))
 702                                 break;
 703
 704                         continue;
 705                 }
 706
 707                 if (client) {
 708                         /* Channel-User-Mode */
 709                         retval = set
 710                                ? Channel_UserModeAdd(Channel, client, x[0])
 711                                : Channel_UserModeDel(Channel, client, x[0]);
 712                         if (retval) {
 713                                 strlcat(the_args, " ", sizeof(the_args));
 714                                 strlcat(the_args, Client_ID(client),
 715                                         sizeof(the_args));
 716                                 strlcat(the_modes, x, sizeof(the_modes));
 717                                 LogDebug
 718                                     ("User \"%s\": Mode change on %s, now \"%s\"",
 719                                      Client_Mask(client), Channel_Name(Channel),
 720                                      Channel_UserModes(Channel, client));
 721                         }
 722                 } else {
 723                         /* Channel-Mode */
 724                         retval = set
 725                                ? Channel_ModeAdd(Channel, x[0])
 726                                : Channel_ModeDel(Channel, x[0]);
 727                         if (retval) {
 728                                 strlcat(the_modes, x, sizeof(the_modes));
 729                                 LogDebug("Channel %s: Mode change, now \"%s\".",
 730                                          Channel_Name(Channel),
 731                                          Channel_Modes(Channel));
 732                         }
 733                 }
 734
 735                 /* Are there additional arguments to add? */
 736                 if (argadd[0]) {
 737                         strlcat(the_args, " ", sizeof(the_args));
 738                         strlcat(the_args, argadd, sizeof(the_args));
 739                 }
 740         }
 741
 742       chan_exit:
 743         /* Are there changed modes? */
 744         if (the_modes[1]) {
 745                 /* Clean up mode string */
 746                 len = strlen(the_modes) - 1;
 747                 if ((the_modes[len] == '+') || (the_modes[len] == '-'))
 748                         the_modes[len] = '\0';
 749
 750                 if (Client_Type(Client) == CLIENT_SERVER) {
 751                         /* MODE requests for local channels from other servers
 752                          * are definitely invalid! */
 753                         if (Channel_IsLocal(Channel)) {
 754                                 Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
 755                                 return CONNECTED;
 756                         }
 757
 758                         /* Forward mode changes to channel users and all the
 759                          * other remote servers: */
 760                         IRC_WriteStrServersPrefix(Client, Origin,
 761                                 "MODE %s %s%s", Channel_Name(Channel),
 762                                 the_modes, the_args);
 763                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 764                                 false, "MODE %s %s%s", Channel_Name(Channel),
 765                                 the_modes, the_args);
 766                 } else {
 767                         if (use_servermode)
 768                                 Origin = Client_ThisServer();
 769                         /* Send reply to client and inform other servers and channel users */
 770                         connected = IRC_WriteStrClientPrefix(Client, Origin,
 771                                         "MODE %s %s%s", Channel_Name(Channel),
 772                                         the_modes, the_args);
 773                         /* Only forward requests for non-local channels */
 774                         if (!Channel_IsLocal(Channel))
 775                                 IRC_WriteStrServersPrefix(Client, Origin,
 776                                         "MODE %s %s%s", Channel_Name(Channel),
 777                                         the_modes, the_args);
 778                         IRC_WriteStrChannelPrefix(Client, Channel, Origin,
 779                                 false, "MODE %s %s%s", Channel_Name(Channel),
 780                                 the_modes, the_args);
 781                 }
 782         }
 783
 784         IRC_SetPenalty(Client, 1);
 785         return connected;
 786 } /* Channel_Mode */
 787
 788
 789 GLOBAL bool
 790 IRC_AWAY( CLIENT *Client, REQUEST *Req )
 791 {
 792         assert( Client != NULL );
 793         assert( Req != NULL );
 794
 795         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 796
 797         if(( Req->argc == 1 ) && (Req->argv[0][0] ))
 798         {
 799                 Client_SetAway( Client, Req->argv[0] );
 800                 Client_ModeAdd( Client, 'a' );
 801                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
 802                 return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
 803         }
 804         else
 805         {
 806                 Client_ModeDel( Client, 'a' );
 807                 IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
 808                 return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
 809         }
 810 } /* IRC_AWAY */
 811
 812
 813 static bool
 814 Add_Ban_Invite(int what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const char *Pattern)
 815 {
 816         const char *mask;
 817         bool already;
 818         bool ret;
 819
 820         assert( Client != NULL );
 821         assert( Channel != NULL );
 822         assert( Pattern != NULL );
 823         assert(what == 'I' || what == 'b');
 824
 825         mask = Lists_MakeMask(Pattern);
 826
 827         already = Lists_CheckDupeMask(Channel_GetListInvites(Channel), mask);
 828         if (!already) {
 829                 if (what == 'I')
 830                         ret = Channel_AddInvite(Channel, mask, false);
 831                 else
 832                         ret = Channel_AddBan(Channel, mask);
 833                 if (!ret)
 834                         return CONNECTED;
 835         }
 836         if (already && (Client_Type(Prefix) == CLIENT_SERVER))
 837                 return CONNECTED;
 838
 839         if (what == 'I')
 840                 return Send_ListChange("+I", Prefix, Client, Channel, mask);
 841         return Send_ListChange("+b", Prefix, Client, Channel, mask);
 842 }
 843
 844
 845 static bool
 846 Del_Ban_Invite(int what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const char *Pattern)
 847 {
 848         const char *mask;
 849         struct list_head *list;
 850
 851         assert( Client != NULL );
 852         assert( Channel != NULL );
 853         assert( Pattern != NULL );
 854         assert(what == 'I' || what == 'b');
 855
 856         mask = Lists_MakeMask( Pattern );
 857
 858         if (what == 'I')
 859                 list = Channel_GetListInvites(Channel);
 860         else
 861                 list = Channel_GetListBans(Channel);
 862
 863         Lists_Del(list, mask);
 864         if (what == 'I')
 865                 return Send_ListChange( "-I", Prefix, Client, Channel, mask );
 866         return Send_ListChange( "-b", Prefix, Client, Channel, mask );
 867 }
 868
 869
 870 static bool
 871 Send_ListChange(const char *Mode, CLIENT *Prefix, CLIENT *Client,
 872                 CHANNEL *Channel, const char *Mask)
 873 {
 874         bool ok;
 875
 876         if( Client_Type( Client ) == CLIENT_USER )
 877         {
 878                 /* send confirmation to client */
 879                 ok = IRC_WriteStrClientPrefix( Client, Prefix, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
 880         }
 881         else ok = true;
 882
 883         /* to other servers */
 884         IRC_WriteStrServersPrefix( Client, Prefix, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
 885
 886         /* and local users in channel */
 887         IRC_WriteStrChannelPrefix( Client, Channel, Prefix, false, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
 888
 889         return ok;
 890 } /* Send_ListChange */
 891
 892
 893 /* -eof- */