src/ngircd/irc-info.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 info commands
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <strings.h>
  26
  27 #include "ngircd.h"
  28 #include "conn-func.h"
  29 #include "conn-zip.h"
  30 #include "channel.h"
  31 #include "class.h"
  32 #include "conf.h"
  33 #include "defines.h"
  34 #include "lists.h"
  35 #include "log.h"
  36 #include "messages.h"
  37 #include "match.h"
  38 #include "tool.h"
  39 #include "parse.h"
  40 #include "irc.h"
  41 #include "irc-macros.h"
  42 #include "irc-write.h"
  43 #include "client-cap.h"
  44
  45 #include "exp.h"
  46 #include "irc-info.h"
  47
  48 /* Local functions */
  49
  50 static unsigned int
  51 t_diff(time_t *t, const time_t d)
  52 {
  53         time_t diff, remain;
  54
  55         diff = *t / d;
  56         remain = diff * d;
  57         *t -= remain;
  58
  59         return (unsigned int)diff;
  60 }
  61
  62 static unsigned int
  63 uptime_days(time_t *now)
  64 {
  65         return t_diff(now, 60 * 60 * 24);
  66 }
  67
  68 static unsigned int
  69 uptime_hrs(time_t *now)
  70 {
  71         return t_diff(now, 60 * 60);
  72 }
  73
  74 static unsigned int
  75 uptime_mins(time_t *now)
  76 {
  77         return t_diff(now, 60);
  78 }
  79
  80 static bool
  81 write_whoreply(CLIENT *Client, CLIENT *c, const char *channelname, const char *flags)
  82 {
  83         return IRC_WriteStrClient(Client, RPL_WHOREPLY_MSG, Client_ID(Client),
  84                                   channelname, Client_User(c),
  85                                   Client_HostnameDisplayed(c),
  86                                   Client_ID(Client_Introducer(c)), Client_ID(c),
  87                                   flags, Client_Hops(c), Client_Info(c));
  88 }
  89
  90 /**
  91  * Return channel user mode prefix(es).
  92  *
  93  * @param Client The client requesting the mode prefixes.
  94  * @param chan_user_modes String with channel user modes.
  95  * @param str String buffer to which the prefix(es) will be appended.
  96  * @param len Size of "str" buffer.
  97  * @return Pointer to "str".
  98  */
  99 static char *
 100 who_flags_qualifier(CLIENT *Client, const char *chan_user_modes,
 101                     char *str, size_t len)
 102 {
 103         assert(Client != NULL);
 104
 105         if (Client_Cap(Client) & CLIENT_CAP_MULTI_PREFIX) {
 106                 if (strchr(chan_user_modes, 'q'))
 107                         strlcat(str, "~", len);
 108                 if (strchr(chan_user_modes, 'a'))
 109                         strlcat(str, "&", len);
 110                 if (strchr(chan_user_modes, 'o'))
 111                         strlcat(str, "@", len);
 112                 if (strchr(chan_user_modes, 'h'))
 113                         strlcat(str, "%", len);
 114                 if (strchr(chan_user_modes, 'v'))
 115                         strlcat(str, "+", len);
 116
 117                 return str;
 118         }
 119
 120         if (strchr(chan_user_modes, 'q'))
 121                 strlcat(str, "~", len);
 122         else if (strchr(chan_user_modes, 'a'))
 123                 strlcat(str, "&", len);
 124         else if (strchr(chan_user_modes, 'o'))
 125                 strlcat(str, "@", len);
 126         else if (strchr(chan_user_modes, 'h'))
 127                 strlcat(str, "%", len);
 128         else if (strchr(chan_user_modes, 'v'))
 129                 strlcat(str, "+", len);
 130
 131         return str;
 132 }
 133
 134 /**
 135  * Send WHO reply for a "channel target" ("WHO #channel").
 136  *
 137  * @param Client Client requesting the information.
 138  * @param Chan Channel being requested.
 139  * @param OnlyOps Only display IRC operators.
 140  * @return CONNECTED or DISCONNECTED.
 141  */
 142 static bool
 143 IRC_WHO_Channel(CLIENT *Client, CHANNEL *Chan, bool OnlyOps)
 144 {
 145         bool is_visible, is_member, is_ircop;
 146         CL2CHAN *cl2chan;
 147         char flags[10];
 148         CLIENT *c;
 149         int count = 0;
 150
 151         assert( Client != NULL );
 152         assert( Chan != NULL );
 153
 154         IRC_SetPenalty(Client, 1);
 155
 156         is_member = Channel_IsMemberOf(Chan, Client);
 157
 158         /* Secret channel? */
 159         if (!is_member && Channel_HasMode(Chan, 's'))
 160                 return IRC_WriteStrClient(Client, RPL_ENDOFWHO_MSG,
 161                                           Client_ID(Client), Channel_Name(Chan));
 162
 163         cl2chan = Channel_FirstMember(Chan);
 164         for (; cl2chan ; cl2chan = Channel_NextMember(Chan, cl2chan)) {
 165                 c = Channel_GetClient(cl2chan);
 166
 167                 is_ircop = Client_HasMode(c, 'o');
 168                 if (OnlyOps && !is_ircop)
 169                         continue;
 170
 171                 is_visible = Client_HasMode(c, 'i');
 172                 if (is_member || is_visible) {
 173                         memset(flags, 0, sizeof(flags));
 174
 175                         if (Client_HasMode(c, 'a'))
 176                                 flags[0] = 'G'; /* away */
 177                         else
 178                                 flags[0] = 'H';
 179
 180                         if (is_ircop)
 181                                 flags[1] = '*';
 182
 183                         who_flags_qualifier(Client, Channel_UserModes(Chan, c),
 184                                             flags, sizeof(flags));
 185
 186                         if (!write_whoreply(Client, c, Channel_Name(Chan),
 187                                             flags))
 188                                 return DISCONNECTED;
 189                         count++;
 190                 }
 191         }
 192
 193         /* If there are a lot of clients, augment penalty a bit */
 194         if (count > MAX_RPL_WHO)
 195                 IRC_SetPenalty(Client, 1);
 196
 197         return IRC_WriteStrClient(Client, RPL_ENDOFWHO_MSG, Client_ID(Client),
 198                                   Channel_Name(Chan));
 199 }
 200
 201 /**
 202  * Send WHO reply for a "mask target" ("WHO m*sk").
 203  *
 204  * @param Client Client requesting the information.
 205  * @param Mask Mask being requested or NULL for "all" clients.
 206  * @param OnlyOps Only display IRC operators.
 207  * @return CONNECTED or DISCONNECTED.
 208  */
 209 static bool
 210 IRC_WHO_Mask(CLIENT *Client, char *Mask, bool OnlyOps)
 211 {
 212         CLIENT *c;
 213         CL2CHAN *cl2chan;
 214         CHANNEL *chan;
 215         bool client_match, is_visible;
 216         char flags[3];
 217         int count = 0;
 218
 219         assert (Client != NULL);
 220
 221         if (Mask)
 222                 ngt_LowerStr(Mask);
 223
 224         IRC_SetPenalty(Client, 3);
 225         for (c = Client_First(); c != NULL; c = Client_Next(c)) {
 226                 if (Client_Type(c) != CLIENT_USER)
 227                         continue;
 228
 229                 if (OnlyOps && !Client_HasMode(c, 'o'))
 230                         continue;
 231
 232                 if (Mask) {
 233                         /* Match pattern against user host/server/name/nick */
 234                         client_match = MatchCaseInsensitive(Mask,
 235                                                             Client_Hostname(c));
 236                         if (!client_match)
 237                                 client_match = MatchCaseInsensitive(Mask,
 238                                                                     Client_ID(Client_Introducer(c)));
 239                         if (!client_match)
 240                                 client_match = MatchCaseInsensitive(Mask,
 241                                                                     Client_Info(c));
 242                         if (!client_match)
 243                                 client_match = MatchCaseInsensitive(Mask,
 244                                                                     Client_ID(c));
 245                         if (!client_match)
 246                                 continue;       /* no match: skip this client */
 247                 }
 248
 249                 is_visible = !Client_HasMode(c, 'i');
 250
 251                 /* Target client is invisible, but mask matches exactly? */
 252                 if (!is_visible && Mask && strcasecmp(Client_ID(c), Mask) == 0)
 253                         is_visible = true;
 254
 255                 /* Target still invisible, but are both on the same channel? */
 256                 if (!is_visible) {
 257                         cl2chan = Channel_FirstChannelOf(Client);
 258                         while (cl2chan && !is_visible) {
 259                                 chan = Channel_GetChannel(cl2chan);
 260                                 if (Channel_IsMemberOf(chan, c))
 261                                         is_visible = true;
 262                                 cl2chan = Channel_NextChannelOf(Client, cl2chan);
 263                         }
 264                 }
 265
 266                 if (!is_visible)        /* target user is not visible */
 267                         continue;
 268
 269                 if (IRC_CheckListTooBig(Client, count, MAX_RPL_WHO, "WHO"))
 270                         break;
 271
 272                 memset(flags, 0, sizeof(flags));
 273
 274                 if (Client_HasMode(c, 'a'))
 275                         flags[0] = 'G'; /* away */
 276                 else
 277                         flags[0] = 'H';
 278
 279                 if (Client_HasMode(c, 'o'))
 280                         flags[1] = '*';
 281
 282                 if (!write_whoreply(Client, c, "*", flags))
 283                         return DISCONNECTED;
 284                 count++;
 285         }
 286
 287         return IRC_WriteStrClient(Client, RPL_ENDOFWHO_MSG, Client_ID(Client),
 288                                   Mask ? Mask : "*");
 289 }
 290
 291 /**
 292  * Generate WHOIS reply of one actual client.
 293  *
 294  * @param Client The client from which this command has been received.
 295  * @param from The client requesting the information ("originator").
 296  * @param c The client of which information should be returned.
 297  * @return CONNECTED or DISCONNECTED.
 298  */
 299 static bool
 300 IRC_WHOIS_SendReply(CLIENT *Client, CLIENT *from, CLIENT *c)
 301 {
 302         char str[COMMAND_LEN];
 303         CL2CHAN *cl2chan;
 304         CHANNEL *chan;
 305
 306         assert(Client != NULL);
 307         assert(from != NULL);
 308         assert(c != NULL);
 309
 310         /* Nick, user, hostname and client info */
 311         if (!IRC_WriteStrClient(from, RPL_WHOISUSER_MSG, Client_ID(from),
 312                                 Client_ID(c), Client_User(c),
 313                                 Client_HostnameDisplayed(c), Client_Info(c)))
 314                 return DISCONNECTED;
 315
 316         /* Server */
 317         if (!IRC_WriteStrClient(from, RPL_WHOISSERVER_MSG, Client_ID(from),
 318                                 Client_ID(c), Client_ID(Client_Introducer(c)),
 319                                 Client_Info(Client_Introducer(c))))
 320                 return DISCONNECTED;
 321
 322         /* Channels */
 323         snprintf(str, sizeof(str), RPL_WHOISCHANNELS_MSG,
 324                  Client_ID(from), Client_ID(c));
 325         cl2chan = Channel_FirstChannelOf(c);
 326         while (cl2chan) {
 327                 chan = Channel_GetChannel(cl2chan);
 328                 assert(chan != NULL);
 329
 330                 /* next */
 331                 cl2chan = Channel_NextChannelOf(c, cl2chan);
 332
 333                 /* Secret channel? */
 334                 if (Channel_HasMode(chan, 's')
 335                     && !Channel_IsMemberOf(chan, Client))
 336                         continue;
 337
 338                 /* Local channel and request is not from a user? */
 339                 if (Client_Type(Client) == CLIENT_SERVER
 340                     && Channel_IsLocal(chan))
 341                         continue;
 342
 343                 /* Concatenate channel names */
 344                 if (str[strlen(str) - 1] != ':')
 345                         strlcat(str, " ", sizeof(str));
 346
 347                 who_flags_qualifier(Client, Channel_UserModes(chan, c),
 348                                     str, sizeof(str));
 349                 strlcat(str, Channel_Name(chan), sizeof(str));
 350
 351                 if (strlen(str) > (COMMAND_LEN - CHANNEL_NAME_LEN - 4)) {
 352                         /* Line becomes too long: send it! */
 353                         if (!IRC_WriteStrClient(Client, "%s", str))
 354                                 return DISCONNECTED;
 355                         snprintf(str, sizeof(str), RPL_WHOISCHANNELS_MSG,
 356                                  Client_ID(from), Client_ID(c));
 357                 }
 358         }
 359         if(str[strlen(str) - 1] != ':') {
 360                 /* There is data left to send: */
 361                 if (!IRC_WriteStrClient(Client, "%s", str))
 362                         return DISCONNECTED;
 363         }
 364
 365         /* IRC-Services? */
 366         if (Client_Type(c) == CLIENT_SERVICE &&
 367             !IRC_WriteStrClient(from, RPL_WHOISSERVICE_MSG,
 368                                 Client_ID(from), Client_ID(c)))
 369                 return DISCONNECTED;
 370
 371         /* IRC-Operator? */
 372         if (Client_Type(c) != CLIENT_SERVICE &&
 373             Client_HasMode(c, 'o') &&
 374             !IRC_WriteStrClient(from, RPL_WHOISOPERATOR_MSG,
 375                                 Client_ID(from), Client_ID(c)))
 376                 return DISCONNECTED;
 377
 378         /* IRC-Bot? */
 379         if (Client_HasMode(c, 'B') &&
 380             !IRC_WriteStrClient(from, RPL_WHOISBOT_MSG,
 381                                 Client_ID(from), Client_ID(c)))
 382                 return DISCONNECTED;
 383
 384         /* Connected using SSL? */
 385         if (Conn_UsesSSL(Client_Conn(c))) {
 386                 if (!IRC_WriteStrClient(from, RPL_WHOISSSL_MSG, Client_ID(from),
 387                                         Client_ID(c)))
 388                         return DISCONNECTED;
 389
 390                 /* Certificate fingerprint? */
 391                 if (Conn_GetCertFp(Client_Conn(c)) &&
 392                     from == c &&
 393                     !IRC_WriteStrClient(from, RPL_WHOISCERTFP_MSG,
 394                                         Client_ID(from), Client_ID(c),
 395                                         Conn_GetCertFp(Client_Conn(c))))
 396                         return DISCONNECTED;
 397         }
 398
 399         /* Registered nickname? */
 400         if (Client_HasMode(c, 'R') &&
 401             !IRC_WriteStrClient(from, RPL_WHOISREGNICK_MSG,
 402                                 Client_ID(from), Client_ID(c)))
 403                 return DISCONNECTED;
 404
 405         /* Local client and requester is the user itself or an IRC Op? */
 406         if (Client_Conn(c) > NONE &&
 407             (from == c || (!Conf_MorePrivacy && Client_HasMode(from, 'o')))) {
 408                 /* Client hostname */
 409                 if (!IRC_WriteStrClient(from, RPL_WHOISHOST_MSG,
 410                                         Client_ID(from), Client_ID(c),
 411                                         Client_Hostname(c), Client_IPAText(c)))
 412                         return DISCONNECTED;
 413                 /* Client modes */
 414                 if (!IRC_WriteStrClient(from, RPL_WHOISMODES_MSG,
 415                                         Client_ID(from), Client_ID(c), Client_Modes(c)))
 416                         return DISCONNECTED;
 417         }
 418
 419         /* Idle and signon time (local clients only!) */
 420         if (!Conf_MorePrivacy && Client_Conn(c) > NONE &&
 421             !IRC_WriteStrClient(from, RPL_WHOISIDLE_MSG,
 422                                 Client_ID(from), Client_ID(c),
 423                                 (unsigned long)Conn_GetIdle(Client_Conn(c)),
 424                                 (unsigned long)Conn_GetSignon(Client_Conn(c))))
 425                 return DISCONNECTED;
 426
 427         /* Away? */
 428         if (Client_HasMode(c, 'a') &&
 429             !IRC_WriteStrClient(from, RPL_AWAY_MSG,
 430                                 Client_ID(from), Client_ID(c), Client_Away(c)))
 431                 return DISCONNECTED;
 432
 433         return CONNECTED;
 434 }
 435
 436 static bool
 437 WHOWAS_EntryWrite(CLIENT *prefix, WHOWAS *entry)
 438 {
 439         char t_str[60];
 440
 441         (void)strftime(t_str, sizeof(t_str), "%a %b %d %H:%M:%S %Y",
 442                        localtime(&entry->time));
 443
 444         if (!IRC_WriteStrClient(prefix, RPL_WHOWASUSER_MSG, Client_ID(prefix),
 445                                 entry->id, entry->user, entry->host, entry->info))
 446                 return DISCONNECTED;
 447
 448         return IRC_WriteStrClient(prefix, RPL_WHOISSERVER_MSG, Client_ID(prefix),
 449                                   entry->id, entry->server, t_str);
 450 }
 451
 452 #ifdef SSL_SUPPORT
 453 static bool
 454 Show_MOTD_SSLInfo(CLIENT *Client)
 455 {
 456         char buf[COMMAND_LEN];
 457         char c_str[128];
 458
 459         if (Conn_GetCipherInfo(Client_Conn(Client), c_str, sizeof(c_str))) {
 460                 snprintf(buf, sizeof(buf), "Connected using Cipher %s", c_str);
 461                 if (!IRC_WriteStrClient(Client, RPL_MOTD_MSG,
 462                                         Client_ID(Client), buf))
 463                         return false;
 464         }
 465
 466         if (Conn_GetCertFp(Client_Conn(Client))) {
 467                 snprintf(buf, sizeof(buf),
 468                          "Your client certificate fingerprint is: %s",
 469                          Conn_GetCertFp(Client_Conn(Client)));
 470                 if (!IRC_WriteStrClient(Client, RPL_MOTD_MSG,
 471                                         Client_ID(Client), buf))
 472                         return false;
 473         }
 474
 475         return true;
 476 }
 477 #else
 478 static bool
 479 Show_MOTD_SSLInfo(UNUSED CLIENT *c)
 480 {
 481         return true;
 482 }
 483 #endif
 484
 485 /* Global functions */
 486
 487 /**
 488  * Handler for the IRC command "ADMIN".
 489  *
 490  * @param Client The client from which this command has been received.
 491  * @param Req Request structure with prefix and all parameters.
 492  * @return CONNECTED or DISCONNECTED.
 493  */
 494 GLOBAL bool
 495 IRC_ADMIN(CLIENT *Client, REQUEST *Req )
 496 {
 497         CLIENT *target, *prefix;
 498
 499         assert( Client != NULL );
 500         assert( Req != NULL );
 501
 502         IRC_SetPenalty(Client, 1);
 503
 504         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
 505         _IRC_GET_SENDER_OR_RETURN_(prefix, Req, Client)
 506         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, prefix)
 507
 508         /* Forward? */
 509         if(target != Client_ThisServer()) {
 510                 IRC_WriteStrClientPrefix(target, prefix,
 511                                          "ADMIN %s", Client_ID(target));
 512                 return CONNECTED;
 513         }
 514
 515         if (!IRC_WriteStrClient(Client, RPL_ADMINME_MSG, Client_ID(prefix),
 516                                 Conf_ServerName))
 517                 return DISCONNECTED;
 518         if (!IRC_WriteStrClient(Client, RPL_ADMINLOC1_MSG, Client_ID(prefix),
 519                                 Conf_ServerAdmin1))
 520                 return DISCONNECTED;
 521         if (!IRC_WriteStrClient(Client, RPL_ADMINLOC2_MSG, Client_ID(prefix),
 522                                 Conf_ServerAdmin2))
 523                 return DISCONNECTED;
 524         if (!IRC_WriteStrClient(Client, RPL_ADMINEMAIL_MSG, Client_ID(prefix),
 525                                 Conf_ServerAdminMail))
 526                 return DISCONNECTED;
 527
 528         return CONNECTED;
 529 } /* IRC_ADMIN */
 530
 531 /**
 532  * Handler for the IRC command "INFO".
 533  *
 534  * @param Client The client from which this command has been received.
 535  * @param Req Request structure with prefix and all parameters.
 536  * @return CONNECTED or DISCONNECTED.
 537  */
 538 GLOBAL bool
 539 IRC_INFO(CLIENT * Client, REQUEST * Req)
 540 {
 541         CLIENT *target, *prefix;
 542         char msg[510];
 543
 544         assert(Client != NULL);
 545         assert(Req != NULL);
 546
 547         IRC_SetPenalty(Client, 2);
 548
 549         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
 550         _IRC_GET_SENDER_OR_RETURN_(prefix, Req, Client)
 551         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, prefix)
 552
 553         /* Forward? */
 554         if (target != Client_ThisServer()) {
 555                 IRC_WriteStrClientPrefix(target, prefix, "INFO %s",
 556                                          Client_ID(target));
 557                 return CONNECTED;
 558         }
 559
 560         if (!IRC_WriteStrClient(Client, RPL_INFO_MSG, Client_ID(prefix),
 561                                 NGIRCd_Version))
 562                 return DISCONNECTED;
 563
 564 #if defined(__DATE__) && defined(__TIME__)
 565         snprintf(msg, sizeof(msg), "Birth Date: %s at %s", __DATE__, __TIME__);
 566         if (!IRC_WriteStrClient(Client, RPL_INFO_MSG, Client_ID(prefix), msg))
 567                 return DISCONNECTED;
 568 #endif
 569
 570         strlcpy(msg, "On-line since ", sizeof(msg));
 571         strlcat(msg, NGIRCd_StartStr, sizeof(msg));
 572         if (!IRC_WriteStrClient(Client, RPL_INFO_MSG, Client_ID(prefix), msg))
 573                 return DISCONNECTED;
 574
 575         if (!IRC_WriteStrClient(Client, RPL_ENDOFINFO_MSG, Client_ID(prefix)))
 576                 return DISCONNECTED;
 577
 578         return CONNECTED;
 579 } /* IRC_INFO */
 580
 581 /**
 582  * Handler for the IRC "ISON" command.
 583  *
 584  * @param Client The client from which this command has been received.
 585  * @param Req Request structure with prefix and all parameters.
 586  * @return CONNECTED or DISCONNECTED.
 587  */
 588 GLOBAL bool
 589 IRC_ISON( CLIENT *Client, REQUEST *Req )
 590 {
 591         char rpl[COMMAND_LEN];
 592         CLIENT *c;
 593         char *ptr;
 594         int i;
 595
 596         assert(Client != NULL);
 597         assert(Req != NULL);
 598
 599         _IRC_ARGC_GE_OR_RETURN_(Client, Req, 1)
 600
 601         strlcpy(rpl, RPL_ISON_MSG, sizeof rpl);
 602         for (i = 0; i < Req->argc; i++) {
 603                 /* "All" ircd even parse ":<x> <y> ..." arguments and split
 604                  * them up; so we do the same ... */
 605                 ptr = strtok(Req->argv[i], " ");
 606                 while (ptr) {
 607                         ngt_TrimStr(ptr);
 608                         c = Client_Search(ptr);
 609                         if (c && Client_Type(c) == CLIENT_USER) {
 610                                 strlcat(rpl, Client_ID(c), sizeof(rpl));
 611                                 strlcat(rpl, " ", sizeof(rpl));
 612                         }
 613                         ptr = strtok(NULL, " ");
 614                 }
 615         }
 616         ngt_TrimLastChr(rpl, ' ');
 617
 618         return IRC_WriteStrClient(Client, rpl, Client_ID(Client));
 619 } /* IRC_ISON */
 620
 621 /**
 622  * Handler for the IRC "LINKS" command.
 623  *
 624  * @param Client The client from which this command has been received.
 625  * @param Req Request structure with prefix and all parameters.
 626  * @return CONNECTED or DISCONNECTED.
 627  */
 628 GLOBAL bool
 629 IRC_LINKS(CLIENT *Client, REQUEST *Req)
 630 {
 631         CLIENT *target, *from, *c;
 632         char *mask;
 633
 634         assert(Client != NULL);
 635         assert(Req != NULL);
 636
 637         IRC_SetPenalty(Client, 1);
 638
 639         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 640         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 641
 642         /* Get pointer to server mask or "*", if none given */
 643         if (Req->argc > 0)
 644                 mask = Req->argv[Req->argc - 1];
 645         else
 646                 mask = "*";
 647
 648         /* Forward? */
 649         if (Req->argc == 2) {
 650                 _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 651                 if (target != Client_ThisServer()) {
 652                         IRC_WriteStrClientPrefix(target, from,
 653                                         "LINKS %s %s", Client_ID(target),
 654                                         Req->argv[1]);
 655                         return CONNECTED;
 656                 }
 657         }
 658
 659         c = Client_First();
 660         while (c) {
 661                 if (Client_Type(c) == CLIENT_SERVER
 662                     && MatchCaseInsensitive(mask, Client_ID(c))) {
 663                         if (!IRC_WriteStrClient(from, RPL_LINKS_MSG,
 664                                         Client_ID(from), Client_ID(c),
 665                                         Client_ID(Client_TopServer(c)
 666                                                   ? Client_TopServer(c)
 667                                                   : Client_ThisServer()),
 668                                         Client_Hops(c), Client_Info(c)))
 669                                 return DISCONNECTED;
 670                 }
 671                 c = Client_Next(c);
 672         }
 673         return IRC_WriteStrClient(from, RPL_ENDOFLINKS_MSG,
 674                                   Client_ID(from), mask);
 675 } /* IRC_LINKS */
 676
 677 /**
 678  * Handler for the IRC "LUSERS" command.
 679  *
 680  * @param Client The client from which this command has been received.
 681  * @param Req Request structure with prefix and all parameters.
 682  * @return CONNECTED or DISCONNECTED.
 683  */
 684 GLOBAL bool
 685 IRC_LUSERS( CLIENT *Client, REQUEST *Req )
 686 {
 687         CLIENT *target, *from;
 688
 689         assert( Client != NULL );
 690         assert( Req != NULL );
 691
 692         IRC_SetPenalty(Client, 1);
 693
 694         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 695         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 696         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 1, from)
 697
 698         /* Forward? */
 699         if (target != Client_ThisServer()) {
 700                 IRC_WriteStrClientPrefix(target, from,
 701                                          "LUSERS %s %s", Req->argv[0],
 702                                          Client_ID(target));
 703                 return CONNECTED;
 704         }
 705
 706         return IRC_Send_LUSERS(from);
 707 } /* IRC_LUSERS */
 708
 709 /**
 710  * Handler for the IRC command "SERVLIST".
 711  *
 712  * @param Client The client from which this command has been received.
 713  * @param Req Request structure with prefix and all parameters.
 714  * @return CONNECTED or DISCONNECTED.
 715  */
 716 GLOBAL bool
 717 IRC_SERVLIST(CLIENT *Client, REQUEST *Req)
 718 {
 719         CLIENT *c;
 720
 721         assert(Client != NULL);
 722         assert(Req != NULL);
 723
 724         IRC_SetPenalty(Client, 1);
 725
 726         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 727
 728         if (Req->argc < 2 || strcmp(Req->argv[1], "0") == 0) {
 729                 for (c = Client_First(); c!= NULL; c = Client_Next(c)) {
 730                         if (Client_Type(c) != CLIENT_SERVICE)
 731                                 continue;
 732                         if (Req->argc > 0 && !MatchCaseInsensitive(Req->argv[0],
 733                                                                   Client_ID(c)))
 734                                 continue;
 735                         if (!IRC_WriteStrClient(Client, RPL_SERVLIST_MSG,
 736                                         Client_ID(Client), Client_Mask(c),
 737                                         Client_Mask(Client_Introducer(c)), "*",
 738                                         0, Client_Hops(c), Client_Info(c)))
 739                                 return DISCONNECTED;
 740                 }
 741         }
 742
 743         return IRC_WriteStrClient(Client, RPL_SERVLISTEND_MSG, Client_ID(Client),
 744                                   Req->argc > 0 ? Req->argv[0] : "*",
 745                                   Req->argc > 1 ? Req->argv[1] : "0");
 746 } /* IRC_SERVLIST */
 747
 748 /**
 749  * Handler for the IRC command "MOTD".
 750  *
 751  * @param Client The client from which this command has been received.
 752  * @param Req Request structure with prefix and all parameters.
 753  * @return CONNECTED or DISCONNECTED.
 754  */
 755 GLOBAL bool
 756 IRC_MOTD( CLIENT *Client, REQUEST *Req )
 757 {
 758         CLIENT *from, *target;
 759
 760         assert( Client != NULL );
 761         assert( Req != NULL );
 762
 763         IRC_SetPenalty(Client, 3);
 764
 765         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
 766         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 767         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 768
 769         /* Forward? */
 770         if (target != Client_ThisServer()) {
 771                 IRC_WriteStrClientPrefix(target, from, "MOTD %s",
 772                                          Client_ID(target));
 773                 return CONNECTED;
 774         }
 775
 776         return IRC_Show_MOTD(from);
 777 } /* IRC_MOTD */
 778
 779 /**
 780  * Handler for the IRC command "NAMES".
 781  *
 782  * @param Client The client from which this command has been received.
 783  * @param Req Request structure with prefix and all parameters.
 784  * @return CONNECTED or DISCONNECTED.
 785  */
 786 GLOBAL bool
 787 IRC_NAMES( CLIENT *Client, REQUEST *Req )
 788 {
 789         char rpl[COMMAND_LEN], *ptr;
 790         CLIENT *target, *from, *c;
 791         CHANNEL *chan;
 792
 793         assert( Client != NULL );
 794         assert( Req != NULL );
 795
 796         IRC_SetPenalty(Client, 1);
 797
 798         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 799         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 800         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 1, from)
 801
 802         /* Forward? */
 803         if (target != Client_ThisServer()) {
 804                 IRC_WriteStrClientPrefix(target, from, "NAMES %s :%s",
 805                                          Req->argv[0], Client_ID(target));
 806                 return CONNECTED;
 807         }
 808
 809         if (Req->argc > 0) {
 810                 /* Return NAMES list for specific channels */
 811                 ptr = strtok(Req->argv[0], ",");
 812                 while(ptr) {
 813                         chan = Channel_Search(ptr);
 814                         if (chan && !IRC_Send_NAMES(from, chan))
 815                                 return DISCONNECTED;
 816                         if (!IRC_WriteStrClient(from, RPL_ENDOFNAMES_MSG,
 817                                                 Client_ID(from), ptr))
 818                                 return DISCONNECTED;
 819                         ptr = strtok( NULL, "," );
 820                 }
 821                 return CONNECTED;
 822         }
 823
 824         chan = Channel_First();
 825         while (chan) {
 826                 if (!IRC_Send_NAMES(from, chan))
 827                         return DISCONNECTED;
 828                 chan = Channel_Next(chan);
 829         }
 830
 831         /* Now print all clients which are not in any channel */
 832         c = Client_First();
 833         snprintf(rpl, sizeof(rpl), RPL_NAMREPLY_MSG, Client_ID(from), "*", "*");
 834         while (c) {
 835                 if (Client_Type(c) == CLIENT_USER
 836                     && Channel_FirstChannelOf(c) == NULL
 837                     && !Client_HasMode(c, 'i'))
 838                 {
 839                         /* its a user, concatenate ... */
 840                         if (rpl[strlen(rpl) - 1] != ':')
 841                                 strlcat(rpl, " ", sizeof(rpl));
 842                         strlcat(rpl, Client_ID(c), sizeof(rpl));
 843
 844                         if (strlen(rpl) > COMMAND_LEN - CLIENT_NICK_LEN - 4) {
 845                                 /* Line is gwoing too long, send now */
 846                                 if (!IRC_WriteStrClient(from, "%s", rpl))
 847                                         return DISCONNECTED;
 848                                 snprintf(rpl, sizeof(rpl), RPL_NAMREPLY_MSG,
 849                                          Client_ID(from), "*", "*");
 850                         }
 851                 }
 852                 c = Client_Next(c);
 853         }
 854         if (rpl[strlen(rpl) - 1] != ':' && !IRC_WriteStrClient(from, "%s", rpl))
 855                 return DISCONNECTED;
 856
 857         return IRC_WriteStrClient(from, RPL_ENDOFNAMES_MSG, Client_ID(from), "*");
 858 } /* IRC_NAMES */
 859
 860 /**
 861  * Handler for the IRC command "STATS".
 862  *
 863  * @param Client The client from which this command has been received.
 864  * @param Req Request structure with prefix and all parameters.
 865  * @return CONNECTED or DISCONNECTED.
 866  */
 867 GLOBAL bool
 868 IRC_STATS( CLIENT *Client, REQUEST *Req )
 869 {
 870         CLIENT *from, *target, *cl;
 871         CONN_ID con;
 872         char query;
 873         COMMAND *cmd;
 874         time_t time_now;
 875         unsigned int days, hrs, mins;
 876         struct list_head *list;
 877         struct list_elem *list_item;
 878
 879         assert(Client != NULL);
 880         assert(Req != NULL);
 881
 882         IRC_SetPenalty(Client, 2);
 883
 884         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 885         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 886         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 1, from)
 887
 888         /* Forward? */
 889         if (target != Client_ThisServer()) {
 890                 IRC_WriteStrClientPrefix(target, from, "STATS %s %s",
 891                                          Req->argv[0], Client_ID(target));
 892                 return CONNECTED;
 893         }
 894
 895         if (Req->argc > 0)
 896                 query = Req->argv[0][0] ? Req->argv[0][0] : '*';
 897         else
 898                 query = '*';
 899
 900         switch (query) {
 901         case 'g':       /* Network-wide bans ("G-Lines") */
 902         case 'G':
 903         case 'k':       /* Server-local bans ("K-Lines") */
 904         case 'K':
 905                 if (!Client_HasMode(from, 'o'))
 906                     return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
 907                                               Client_ID(from));
 908                 if (query == 'g' || query == 'G')
 909                         list = Class_GetList(CLASS_GLINE);
 910                 else
 911                         list = Class_GetList(CLASS_KLINE);
 912                         list_item = Lists_GetFirst(list);
 913                         while (list_item) {
 914                                 if (!IRC_WriteStrClient(from, RPL_STATSXLINE_MSG,
 915                                                 Client_ID(from), query,
 916                                                 Lists_GetMask(list_item),
 917                                                 Lists_GetValidity(list_item),
 918                                                 Lists_GetReason(list_item)))
 919                                         return DISCONNECTED;
 920                                 list_item = Lists_GetNext(list_item);
 921                         }
 922                 break;
 923         case 'l':       /* Link status (servers and own link) */
 924         case 'L':
 925                 time_now = time(NULL);
 926                 for (con = Conn_First(); con != NONE; con = Conn_Next(con)) {
 927                         cl = Conn_GetClient(con);
 928                         if (!cl)
 929                                 continue;
 930                         if ((Client_Type(cl) == CLIENT_SERVER)
 931                             || (cl == Client)) {
 932                                 /* Server link or our own connection */
 933 #ifdef ZLIB
 934                                 if (Conn_Options(con) & CONN_ZIP) {
 935                                         if (!IRC_WriteStrClient
 936                                             (from, RPL_STATSLINKINFOZIP_MSG,
 937                                              Client_ID(from), Client_Mask(cl),
 938                                              Conn_SendQ(con), Conn_SendMsg(con),
 939                                              Zip_SendBytes(con),
 940                                              Conn_SendBytes(con),
 941                                              Conn_RecvMsg(con),
 942                                              Zip_RecvBytes(con),
 943                                              Conn_RecvBytes(con),
 944                                              (long)(time_now - Conn_StartTime(con))))
 945                                                 return DISCONNECTED;
 946                                         continue;
 947                                 }
 948 #endif
 949                                 if (!IRC_WriteStrClient
 950                                     (from, RPL_STATSLINKINFO_MSG,
 951                                      Client_ID(from), Client_Mask(cl),
 952                                      Conn_SendQ(con), Conn_SendMsg(con),
 953                                      Conn_SendBytes(con), Conn_RecvMsg(con),
 954                                      Conn_RecvBytes(con),
 955                                      (long)(time_now - Conn_StartTime(con))))
 956                                         return DISCONNECTED;
 957                         }
 958                 }
 959                 break;
 960         case 'm':       /* IRC command status (usage count) */
 961         case 'M':
 962                 cmd = Parse_GetCommandStruct();
 963                 for (; cmd->name; cmd++) {
 964                         if (cmd->lcount == 0 && cmd->rcount == 0)
 965                                 continue;
 966                         if (!IRC_WriteStrClient
 967                             (from, RPL_STATSCOMMANDS_MSG, Client_ID(from),
 968                              cmd->name, cmd->lcount, cmd->bytes, cmd->rcount))
 969                                 return DISCONNECTED;
 970                 }
 971                 break;
 972         case 'u':       /* Server uptime */
 973         case 'U':
 974                 time_now = time(NULL) - NGIRCd_Start;
 975                 days = uptime_days(&time_now);
 976                 hrs = uptime_hrs(&time_now);
 977                 mins = uptime_mins(&time_now);
 978                 if (!IRC_WriteStrClient(from, RPL_STATSUPTIME, Client_ID(from),
 979                                        days, hrs, mins, (unsigned int)time_now))
 980                         return DISCONNECTED;
 981                 break;
 982         }
 983
 984         return IRC_WriteStrClient(from, RPL_ENDOFSTATS_MSG,
 985                                   Client_ID(from), query);
 986 } /* IRC_STATS */
 987
 988 /**
 989  * Handler for the IRC command "SUMMON".
 990  *
 991  * @param Client The client from which this command has been received.
 992  * @param Req Request structure with prefix and all parameters.
 993  * @return CONNECTED or DISCONNECTED.
 994  */
 995 GLOBAL bool
 996 IRC_SUMMON(CLIENT * Client, UNUSED REQUEST * Req)
 997 {
 998         assert(Client != NULL);
 999
1000         return IRC_WriteErrClient(Client, ERR_SUMMONDISABLED_MSG,
1001                                   Client_ID(Client));
1002 } /* IRC_SUMMON */
1003
1004 /**
1005  * Handler for the IRC command "TIME".
1006  *
1007  * @param Client The client from which this command has been received.
1008  * @param Req Request structure with prefix and all parameters.
1009  * @return CONNECTED or DISCONNECTED.
1010  */
1011 GLOBAL bool
1012 IRC_TIME( CLIENT *Client, REQUEST *Req )
1013 {
1014         CLIENT *from, *target;
1015         char t_str[64];
1016         time_t t;
1017
1018         assert(Client != NULL);
1019         assert(Req != NULL);
1020
1021         IRC_SetPenalty(Client, 1);
1022
1023         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
1024         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
1025         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
1026
1027         /* Forward? */
1028         if (target != Client_ThisServer()) {
1029                 IRC_WriteStrClientPrefix(target, from, "TIME %s",
1030                                          Client_ID(target));
1031                 return CONNECTED;
1032         }
1033
1034         t = time( NULL );
1035         (void)strftime(t_str, 60, "%A %B %d %Y -- %H:%M %Z", localtime(&t));
1036         return IRC_WriteStrClient(from, RPL_TIME_MSG, Client_ID(from),
1037                                   Client_ID(Client_ThisServer()), t_str);
1038 } /* IRC_TIME */
1039
1040 /**
1041  * Handler for the IRC command "USERHOST".
1042  *
1043  * @param Client The client from which this command has been received.
1044  * @param Req Request structure with prefix and all parameters.
1045  * @return CONNECTED or DISCONNECTED.
1046  */
1047 GLOBAL bool
1048 IRC_USERHOST(CLIENT *Client, REQUEST *Req)
1049 {
1050         char rpl[COMMAND_LEN];
1051         CLIENT *c;
1052         int max, i;
1053
1054         assert(Client != NULL);
1055         assert(Req != NULL);
1056
1057         IRC_SetPenalty(Client, 1);
1058
1059         _IRC_ARGC_GE_OR_RETURN_(Client, Req, 1)
1060
1061         if (Req->argc > 5)
1062                 max = 5;
1063         else
1064                 max = Req->argc;
1065
1066         strlcpy(rpl, RPL_USERHOST_MSG, sizeof rpl);
1067         for (i = 0; i < max; i++) {
1068                 c = Client_Search(Req->argv[i]);
1069                 if (c && (Client_Type(c) == CLIENT_USER)) {
1070                         /* This Nick is "online" */
1071                         strlcat(rpl, Client_ID(c), sizeof(rpl));
1072                         if (Client_HasMode(c, 'o'))
1073                                 strlcat(rpl, "*", sizeof(rpl));
1074                         strlcat(rpl, "=", sizeof(rpl));
1075                         if (Client_HasMode(c, 'a'))
1076                                 strlcat(rpl, "-", sizeof(rpl));
1077                         else
1078                                 strlcat(rpl, "+", sizeof(rpl));
1079                         strlcat(rpl, Client_User(c), sizeof(rpl));
1080                         strlcat(rpl, "@", sizeof(rpl));
1081                         strlcat(rpl, Client_HostnameDisplayed(c), sizeof(rpl));
1082                         strlcat(rpl, " ", sizeof(rpl));
1083                 }
1084         }
1085         ngt_TrimLastChr(rpl, ' ');
1086
1087         return IRC_WriteStrClient(Client, rpl, Client_ID(Client));
1088 } /* IRC_USERHOST */
1089
1090 /**
1091  * Handler for the IRC command "USERS".
1092  *
1093  * @param Client The client from which this command has been received.
1094  * @param Req Request structure with prefix and all parameters.
1095  * @return CONNECTED or DISCONNECTED.
1096  */
1097 GLOBAL bool
1098 IRC_USERS(CLIENT * Client, UNUSED REQUEST * Req)
1099 {
1100         assert(Client != NULL);
1101
1102         return IRC_WriteErrClient(Client, ERR_USERSDISABLED_MSG,
1103                                   Client_ID(Client));
1104 } /* IRC_USERS */
1105
1106 /**
1107  * Handler for the IRC command "VERSION".
1108  *
1109  * @param Client The client from which this command has been received.
1110  * @param Req Request structure with prefix and all parameters.
1111  * @return CONNECTED or DISCONNECTED.
1112  */
1113 GLOBAL bool
1114 IRC_VERSION( CLIENT *Client, REQUEST *Req )
1115 {
1116         CLIENT *target, *prefix;
1117
1118         assert( Client != NULL );
1119         assert( Req != NULL );
1120
1121         IRC_SetPenalty(Client, 1);
1122
1123         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
1124         _IRC_GET_SENDER_OR_RETURN_(prefix, Req, Client)
1125         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, prefix)
1126
1127         /* Forward? */
1128         if (target != Client_ThisServer()) {
1129                 IRC_WriteStrClientPrefix(target, prefix, "VERSION %s",
1130                                          Client_ID(target));
1131                 return CONNECTED;
1132         }
1133
1134         /* send version information */
1135         return IRC_WriteStrClient(Client, RPL_VERSION_MSG, Client_ID(prefix),
1136                                   PACKAGE_NAME, PACKAGE_VERSION,
1137                                   NGIRCd_DebugLevel, Conf_ServerName,
1138                                   NGIRCd_VersionAddition);
1139 } /* IRC_VERSION */
1140
1141 /**
1142  * Handler for the IRC "WHO" command.
1143  *
1144  * @param Client The client from which this command has been received.
1145  * @param Req Request structure with prefix and all parameters.
1146  * @return CONNECTED or DISCONNECTED.
1147  */
1148 GLOBAL bool
1149 IRC_WHO(CLIENT *Client, REQUEST *Req)
1150 {
1151         bool only_ops;
1152         CHANNEL *chan;
1153
1154         assert (Client != NULL);
1155         assert (Req != NULL);
1156
1157         IRC_SetPenalty(Client, 1);
1158
1159         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
1160
1161         only_ops = false;
1162         if (Req->argc == 2) {
1163                 if (strcmp(Req->argv[1], "o") == 0)
1164                         only_ops = true;
1165 #ifdef STRICT_RFC
1166                 else
1167                         return IRC_WriteErrClient(Client,
1168                                                   ERR_NEEDMOREPARAMS_MSG,
1169                                                   Client_ID(Client),
1170                                                   Req->command);
1171 #endif
1172         }
1173
1174         if (Req->argc >= 1) {
1175                 /* Channel or mask given */
1176                 chan = Channel_Search(Req->argv[0]);
1177                 if (chan) {
1178                         /* Members of a channel have been requested */
1179                         return IRC_WHO_Channel(Client, chan, only_ops);
1180                 }
1181                 if (strcmp(Req->argv[0], "0") != 0) {
1182                         /* A mask has been given. But please note this RFC
1183                          * stupidity: "0" is same as no arguments ... */
1184                         return IRC_WHO_Mask(Client, Req->argv[0], only_ops);
1185                 }
1186         }
1187
1188         /* No channel or (valid) mask given */
1189         IRC_SetPenalty(Client, 2);
1190         return IRC_WHO_Mask(Client, NULL, only_ops);
1191 } /* IRC_WHO */
1192
1193 /**
1194  * Handler for the IRC "WHOIS" command.
1195  *
1196  * @param Client The client from which this command has been received.
1197  * @param Req Request structure with prefix and all parameters.
1198  * @return CONNECTED or DISCONNECTED.
1199  */
1200 GLOBAL bool
1201 IRC_WHOIS( CLIENT *Client, REQUEST *Req )
1202 {
1203         CLIENT *from, *target, *c;
1204         unsigned int match_count = 0, found = 0;
1205         bool has_wildcards, is_remote;
1206         bool got_wildcard = false;
1207         char mask[COMMAND_LEN], *query;
1208
1209         assert( Client != NULL );
1210         assert( Req != NULL );
1211
1212         IRC_SetPenalty(Client, 1);
1213
1214         /* Wrong number of parameters? */
1215         if (Req->argc < 1)
1216                 return IRC_WriteErrClient(Client, ERR_NONICKNAMEGIVEN_MSG,
1217                                           Client_ID(Client));
1218
1219         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
1220         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
1221
1222         /* Get target server for this command */
1223         if (Req->argc > 1) {
1224                 _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, Client)
1225         } else
1226                 target = Client_ThisServer();
1227
1228         assert(target != NULL);
1229
1230         /* Forward? */
1231         if (target != Client_ThisServer()) {
1232                 IRC_WriteStrClientPrefix(target, from, "WHOIS %s :%s",
1233                                          Req->argv[0], Req->argv[1]);
1234                 return CONNECTED;
1235         }
1236
1237         is_remote = Client_Conn(from) < 0;
1238         strlcpy(mask, Req->argv[Req->argc - 1], sizeof(mask));
1239         for (query = strtok(ngt_LowerStr(mask), ",");
1240                         query && found < 3;
1241                         query = strtok(NULL, ","), found++)
1242         {
1243                 has_wildcards = query[strcspn(query, "*?")] != 0;
1244                 /*
1245                  * follows ircd 2.10 implementation:
1246                  *  - handle up to 3 targets
1247                  *  - no wildcards for remote clients
1248                  *  - only one wildcard target per local client
1249                  *
1250                  *  Also, at most MAX_RPL_WHOIS matches are returned.
1251                  */
1252                 if (!has_wildcards || is_remote) {
1253                         c = Client_Search(query);
1254                         if (c && (Client_Type(c) == CLIENT_USER
1255                                   || Client_Type(c) == CLIENT_SERVICE)) {
1256                                 if (!IRC_WHOIS_SendReply(Client, from, c))
1257                                         return DISCONNECTED;
1258                         } else {
1259                                 if (!IRC_WriteErrClient(Client,
1260                                                         ERR_NOSUCHNICK_MSG,
1261                                                         Client_ID(Client),
1262                                                         query))
1263                                         return DISCONNECTED;
1264                         }
1265                         continue;
1266                 }
1267                 if (got_wildcard) {
1268                         /* we already handled one wildcard query */
1269                         if (!IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
1270                              Client_ID(Client), query))
1271                                 return DISCONNECTED;
1272                         continue;
1273                 }
1274                 got_wildcard = true;
1275                 IRC_SetPenalty(Client, 3);
1276
1277                 for (c = Client_First(); c; c = Client_Next(c)) {
1278                         if (IRC_CheckListTooBig(Client, match_count,
1279                                             MAX_RPL_WHOIS, "WHOIS"))
1280                                 break;
1281
1282                         if (Client_Type(c) != CLIENT_USER)
1283                                 continue;
1284                         if (!MatchCaseInsensitive(query, Client_ID(c)))
1285                                 continue;
1286                         if (!IRC_WHOIS_SendReply(Client, from, c))
1287                                 return DISCONNECTED;
1288
1289                         match_count++;
1290                 }
1291
1292                 if (match_count == 0)
1293                         IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
1294                                            Client_ID(Client),
1295                                            Req->argv[Req->argc - 1]);
1296         }
1297         return IRC_WriteStrClient(from, RPL_ENDOFWHOIS_MSG,
1298                                   Client_ID(from), Req->argv[Req->argc - 1]);
1299 } /* IRC_WHOIS */
1300
1301 /**
1302  * Handler for the IRC "WHOWAS" command.
1303  *
1304  * @param Client The client from which this command has been received.
1305  * @param Req Request structure with prefix and all parameters.
1306  * @return CONNECTED or DISCONNECTED.
1307  */
1308 GLOBAL bool
1309 IRC_WHOWAS( CLIENT *Client, REQUEST *Req )
1310 {
1311         CLIENT *target, *prefix;
1312         WHOWAS *whowas;
1313         char tok_buf[COMMAND_LEN];
1314         int max, last, count, i, nc;
1315         const char *nick;
1316
1317         assert( Client != NULL );
1318         assert( Req != NULL );
1319
1320         /* Do not reveal any info on disconnected users? */
1321         if (Conf_MorePrivacy)
1322                 return CONNECTED;
1323
1324         /* Wrong number of parameters? */
1325         if (Req->argc < 1)
1326                 return IRC_WriteErrClient(Client, ERR_NONICKNAMEGIVEN_MSG,
1327                                           Client_ID(Client));
1328
1329         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 3)
1330         _IRC_GET_SENDER_OR_RETURN_(prefix, Req, Client)
1331         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 2, prefix)
1332
1333         /* Forward? */
1334         if (target != Client_ThisServer()) {
1335                 IRC_WriteStrClientPrefix(target, prefix, "WHOWAS %s %s %s",
1336                                          Req->argv[0], Req->argv[1],
1337                                          Client_ID(target));
1338                 return CONNECTED;
1339         }
1340
1341         whowas = Client_GetWhowas( );
1342         last = Client_GetLastWhowasIndex( );
1343         if (last < 0)
1344                 last = 0;
1345
1346         max = DEF_RPL_WHOWAS;
1347         if (Req->argc > 1) {
1348                 max = atoi(Req->argv[1]);
1349                 if (max < 1)
1350                         max = MAX_RPL_WHOWAS;
1351         }
1352
1353         /*
1354          * Break up the nick argument into a list of nicks, if applicable
1355          * Can't modify Req->argv[0] because we need it for RPL_ENDOFWHOWAS_MSG.
1356          */
1357         strlcpy(tok_buf, Req->argv[0], sizeof(tok_buf));
1358         nick = strtok(tok_buf, ",");
1359
1360         for (i=last, count=0; nick != NULL ; nick = strtok(NULL, ",")) {
1361                 nc = 0;
1362                 do {
1363                         /* Used entry? */
1364                         if (whowas[i].time > 0 && strcasecmp(nick, whowas[i].id) == 0) {
1365                                 if (!WHOWAS_EntryWrite(prefix, &whowas[i]))
1366                                         return DISCONNECTED;
1367                                 nc++;
1368                                 count++;
1369                         }
1370                         /* previous entry */
1371                         i--;
1372
1373                         /* "underflow", wrap around */
1374                         if (i < 0)
1375                                 i = MAX_WHOWAS - 1;
1376
1377                         if (nc && count >= max)
1378                                 break;
1379                 } while (i != last);
1380
1381                 if (nc == 0 && !IRC_WriteErrClient(prefix, ERR_WASNOSUCHNICK_MSG,
1382                                                 Client_ID(prefix), nick))
1383                         return DISCONNECTED;
1384         }
1385         return IRC_WriteStrClient(prefix, RPL_ENDOFWHOWAS_MSG,
1386                                   Client_ID(prefix), Req->argv[0]);
1387 } /* IRC_WHOWAS */
1388
1389 /**
1390  * Send LUSERS reply to a client.
1391  *
1392  * @param Client The receipient of the information.
1393  * @return CONNECTED or DISCONNECTED.
1394  */
1395 GLOBAL bool
1396 IRC_Send_LUSERS(CLIENT *Client)
1397 {
1398         unsigned long cnt;
1399 #ifndef STRICT_RFC
1400         unsigned long max;
1401 #endif
1402
1403         assert(Client != NULL);
1404
1405         /* Users, services and servers in the network */
1406         if (!IRC_WriteStrClient(Client, RPL_LUSERCLIENT_MSG, Client_ID(Client),
1407                                 Client_UserCount(), Client_ServiceCount(),
1408                                 Client_ServerCount()))
1409                 return DISCONNECTED;
1410
1411         /* Number of IRC operators */
1412         cnt = Client_OperCount( );
1413         if (cnt > 0) {
1414                 if (!IRC_WriteStrClient(Client, RPL_LUSEROP_MSG,
1415                                         Client_ID(Client), cnt))
1416                         return DISCONNECTED;
1417         }
1418
1419         /* Unknown connections */
1420         cnt = Client_UnknownCount( );
1421         if (cnt > 0) {
1422                 if (!IRC_WriteStrClient(Client, RPL_LUSERUNKNOWN_MSG,
1423                                         Client_ID(Client), cnt))
1424                         return DISCONNECTED;
1425         }
1426
1427         /* Number of created channels */
1428         if (!IRC_WriteStrClient(Client, RPL_LUSERCHANNELS_MSG,
1429                                 Client_ID(Client),
1430                                 Channel_CountVisible(Client)))
1431                 return DISCONNECTED;
1432
1433         /* Number of local users, services and servers */
1434         if (!IRC_WriteStrClient(Client, RPL_LUSERME_MSG, Client_ID(Client),
1435                                 Client_MyUserCount(), Client_MyServiceCount(),
1436                                 Client_MyServerCount()))
1437                 return DISCONNECTED;
1438
1439 #ifndef STRICT_RFC
1440         /* Maximum number of local users */
1441         cnt = Client_MyUserCount();
1442         max = Client_MyMaxUserCount();
1443         if (! IRC_WriteStrClient(Client, RPL_LOCALUSERS_MSG, Client_ID(Client),
1444                         cnt, max, cnt, max))
1445                 return DISCONNECTED;
1446         /* Maximum number of users in the network */
1447         cnt = Client_UserCount();
1448         max = Client_MaxUserCount();
1449         if(! IRC_WriteStrClient(Client, RPL_NETUSERS_MSG, Client_ID(Client),
1450                         cnt, max, cnt, max))
1451                 return DISCONNECTED;
1452         /* Connection counters */
1453         if (! IRC_WriteStrClient(Client, RPL_STATSCONN_MSG, Client_ID(Client),
1454                         Conn_CountMax(), Conn_CountAccepted()))
1455                 return DISCONNECTED;
1456 #endif
1457
1458         return CONNECTED;
1459 } /* IRC_Send_LUSERS */
1460
1461 GLOBAL bool
1462 IRC_Show_MOTD( CLIENT *Client )
1463 {
1464         const char *line;
1465         size_t len_tot, len_str;
1466
1467         assert( Client != NULL );
1468
1469         len_tot = array_bytes(&Conf_Motd);
1470         if (len_tot == 0 && !Conn_UsesSSL(Client_Conn(Client)))
1471                 return IRC_WriteErrClient(Client, ERR_NOMOTD_MSG, Client_ID(Client));
1472
1473         if (!IRC_WriteStrClient(Client, RPL_MOTDSTART_MSG, Client_ID(Client),
1474                                 Client_ID(Client_ThisServer())))
1475                 return DISCONNECTED;
1476
1477         line = array_start(&Conf_Motd);
1478         while (len_tot > 0) {
1479                 len_str = strlen(line) + 1;
1480
1481                 assert(len_tot >= len_str);
1482                 len_tot -= len_str;
1483
1484                 if (!IRC_WriteStrClient(Client, RPL_MOTD_MSG, Client_ID(Client), line))
1485                         return DISCONNECTED;
1486                 line += len_str;
1487         }
1488
1489         if (!Show_MOTD_SSLInfo(Client))
1490                 return DISCONNECTED;
1491
1492         if (!IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG, Client_ID(Client)))
1493                 return DISCONNECTED;
1494
1495         if (*Conf_CloakHost)
1496                 return IRC_WriteStrClient(Client, RPL_HOSTHIDDEN_MSG,
1497                                           Client_ID(Client),
1498                                           Client_Hostname(Client));
1499
1500         return CONNECTED;
1501 } /* IRC_Show_MOTD */
1502
1503 /**
1504  * Send NAMES reply for a specific client and channel.
1505  *
1506  * @param Client The client requesting the NAMES information.
1507  * @param Chan The channel
1508  * @return CONNECTED or DISCONNECTED.
1509  */
1510 GLOBAL bool
1511 IRC_Send_NAMES(CLIENT * Client, CHANNEL * Chan)
1512 {
1513         bool is_visible, is_member;
1514         char str[COMMAND_LEN];
1515         CL2CHAN *cl2chan;
1516         CLIENT *cl;
1517
1518         assert(Client != NULL);
1519         assert(Chan != NULL);
1520
1521         if (Channel_IsMemberOf(Chan, Client))
1522                 is_member = true;
1523         else
1524                 is_member = false;
1525
1526         /* Do not print info on channel memberships to anyone that is not member? */
1527         if (Conf_MorePrivacy && !is_member)
1528                 return CONNECTED;
1529
1530         /* Secret channel? */
1531         if (!is_member && Channel_HasMode(Chan, 's'))
1532                 return CONNECTED;
1533
1534         snprintf(str, sizeof(str), RPL_NAMREPLY_MSG, Client_ID(Client), "=",
1535                  Channel_Name(Chan));
1536         cl2chan = Channel_FirstMember(Chan);
1537         while (cl2chan) {
1538                 cl = Channel_GetClient(cl2chan);
1539
1540                 if (Client_HasMode(cl, 'i'))
1541                         is_visible = false;
1542                 else
1543                         is_visible = true;
1544
1545                 if (is_member || is_visible) {
1546                         if (str[strlen(str) - 1] != ':')
1547                                 strlcat(str, " ", sizeof(str));
1548
1549                         who_flags_qualifier(Client, Channel_UserModes(Chan, cl),
1550                                             str, sizeof(str));
1551                         strlcat(str, Client_ID(cl), sizeof(str));
1552
1553                         if (strlen(str) > (COMMAND_LEN - CLIENT_NICK_LEN - 4)) {
1554                                 if (!IRC_WriteStrClient(Client, "%s", str))
1555                                         return DISCONNECTED;
1556                                 snprintf(str, sizeof(str), RPL_NAMREPLY_MSG,
1557                                          Client_ID(Client), "=",
1558                                          Channel_Name(Chan));
1559                         }
1560                 }
1561
1562                 cl2chan = Channel_NextMember(Chan, cl2chan);
1563         }
1564         if (str[strlen(str) - 1] != ':') {
1565                 if (!IRC_WriteStrClient(Client, "%s", str))
1566                         return DISCONNECTED;
1567         }
1568
1569         return CONNECTED;
1570 } /* IRC_Send_NAMES */
1571
1572 /**
1573  * Send the ISUPPORT numeric (005).
1574  * This numeric indicates the features that are supported by this server.
1575  * See <http://www.irc.org/tech_docs/005.html> for details.
1576  */
1577 GLOBAL bool
1578 IRC_Send_ISUPPORT(CLIENT * Client)
1579 {
1580         if (!IRC_WriteStrClient(Client, RPL_ISUPPORT1_MSG, Client_ID(Client),
1581                                 CHANTYPES, CHANTYPES, Conf_MaxJoins))
1582                 return DISCONNECTED;
1583         return IRC_WriteStrClient(Client, RPL_ISUPPORT2_MSG, Client_ID(Client),
1584                                   CHANNEL_NAME_LEN - 1, Conf_MaxNickLength - 1,
1585                                   COMMAND_LEN - 23, CLIENT_AWAY_LEN - 1,
1586                                   COMMAND_LEN - 113, MAX_HNDL_MODES_ARG,
1587                                   MAX_HNDL_CHANNEL_LISTS);
1588 } /* IRC_Send_ISUPPORT */
1589
1590 /* -eof- */