ircd/parse.c

   1 /*
   2  * IRC - Internet Relay Chat, common/parse.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 1, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 /** @file
  21  * @brief Parse input from IRC clients and other servers.
  22  * @version $Id: parse.c,v 1.54 2005/09/27 03:54:46 entrope Exp $
  23  */
  24 #include "config.h"
  25
  26 #include "parse.h"
  27 #include "client.h"
  28 #include "channel.h"
  29 #include "handlers.h"
  30 #include "hash.h"
  31 #include "ircd.h"
  32 #include "ircd_alloc.h"
  33 #include "ircd_chattr.h"
  34 #include "ircd_features.h"
  35 #include "ircd_log.h"
  36 #include "ircd_reply.h"
  37 #include "ircd_string.h"
  38 #include "msg.h"
  39 #include "numeric.h"
  40 #include "numnicks.h"
  41 #include "opercmds.h"
  42 #include "querycmds.h"
  43 #include "res.h"
  44 #include "s_bsd.h"
  45 #include "s_conf.h"
  46 #include "s_debug.h"
  47 #include "s_misc.h"
  48 #include "s_numeric.h"
  49 #include "s_user.h"
  50 #include "send.h"
  51 #include "struct.h"
  52 #include "sys.h"
  53 #include "whocmds.h"
  54 #include "whowas.h"
  55
  56 /* #include <assert.h> -- Now using assert in ircd_log.h */
  57 #include <string.h>
  58 #include <stdlib.h>
  59
  60 /*
  61  * Message Tree stuff mostly written by orabidoo, with changes by Dianora.
  62  * Adapted to Undernet, adding token support, etc by comstud 10/06/97
  63  *
  64  * completely rewritten June 2, 2003 - Dianora
  65  *
  66  * This has always just been a trie. Look at volume III of Knuth ACP
  67  *
  68  *
  69  * ok, you start out with an array of pointers, each one corresponds
  70  * to a letter at the current position in the command being examined.
  71  *
  72  * so roughly you have this for matching 'trie' or 'tie'
  73  *
  74  * 't' points -> [MessageTree *] 'r' -> [MessageTree *] -> 'i'
  75  *   -> [MessageTree *] -> [MessageTree *] -> 'e' and matches
  76  *
  77  *                               'i' -> [MessageTree *] -> 'e' and matches
  78  */
  79
  80 /** Number of children under a trie node. */
  81 #define MAXPTRLEN       32      /* Must be a power of 2, and
  82                                  * larger than 26 [a-z]|[A-Z]
  83                                  * its used to allocate the set
  84                                  * of pointers at each node of the tree
  85                                  * There are MAXPTRLEN pointers at each node.
  86                                  * Obviously, there have to be more pointers
  87                                  * Than ASCII letters. 32 is a nice number
  88                                  * since there is then no need to shift
  89                                  * 'A'/'a' to base 0 index, at the expense
  90                                  * of a few never used pointers. For a small
  91                                  * parser like this, this is a good compromise
  92                                  * and does make it somewhat faster.
  93                                  *
  94                                  * - Dianora
  95                                  */
  96
  97 /** Node in the command lookup trie. */
  98 struct MessageTree {
  99   struct Message *msg; /**< Message (if any) if the string ends now. */
 100   struct MessageTree *pointers[MAXPTRLEN]; /**< Child nodes for each letter. */
 101 };
 102
 103 /** Root of command lookup trie. */
 104 static struct MessageTree msg_tree;
 105 static struct MessageTree tok_tree;
 106
 107 /** Array of all supported commands. */
 108 struct Message msgtab[] = {
 109   {
 110     MSG_PRIVATE,
 111     TOK_PRIVATE,
 112     0, MAXPARA, MFLG_SLOW, 0, NULL,
 113     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 114     { m_unregistered, m_privmsg, ms_privmsg, mo_privmsg, m_ignore }
 115   },
 116   {
 117     MSG_NICK,
 118     TOK_NICK,
 119     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
 120     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 121     { m_nick, m_nick, ms_nick, m_nick, m_ignore }
 122   },
 123   {
 124     MSG_NOTICE,
 125     TOK_NOTICE,
 126     0, MAXPARA, MFLG_SLOW | MFLG_IGNORE, 0, NULL,
 127     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 128     { m_ignore, m_notice, ms_notice, mo_notice, m_ignore }
 129   },
 130   {
 131     MSG_WALLCHOPS,
 132     TOK_WALLCHOPS,
 133     0, MAXPARA, MFLG_SLOW, 0, NULL,
 134     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 135     { m_unregistered, m_wallchops, ms_wallchops, m_wallchops, m_ignore }
 136   },
 137   {
 138     MSG_WALLVOICES,
 139     TOK_WALLVOICES,
 140     0, MAXPARA, MFLG_SLOW, 0, NULL,
 141     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 142     { m_unregistered, m_wallvoices, ms_wallvoices, m_wallvoices, m_ignore }
 143   },
 144   {
 145     MSG_CPRIVMSG,
 146     TOK_CPRIVMSG,
 147     0, MAXPARA, MFLG_SLOW, 0, NULL,
 148     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 149     { m_unregistered, m_cprivmsg, m_ignore, m_cprivmsg, m_ignore }
 150   },
 151   {
 152     MSG_CNOTICE,
 153     TOK_CNOTICE,
 154     0, MAXPARA, MFLG_SLOW, 0, NULL,
 155     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 156     { m_unregistered, m_cnotice, m_ignore, m_cnotice, m_ignore }
 157   },
 158   {
 159     MSG_JOIN,
 160     TOK_JOIN,
 161     0, MAXPARA, MFLG_SLOW, 0, NULL,
 162     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 163     { m_unregistered, m_join, ms_join, m_join, m_ignore }
 164   },
 165   {
 166     MSG_MODE,
 167     TOK_MODE,
 168     0, MAXPARA, MFLG_SLOW, 0, NULL,
 169     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 170     { m_unregistered, m_mode, ms_mode, m_mode, m_ignore }
 171   },
 172   {
 173     MSG_BURST,
 174     TOK_BURST,
 175     0, MAXPARA, MFLG_SLOW, 0, NULL,
 176     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 177     { m_ignore, m_ignore, ms_burst, m_ignore, m_ignore }
 178   },
 179   {
 180     MSG_CREATE,
 181     TOK_CREATE,
 182     0, MAXPARA, MFLG_SLOW, 0, NULL,
 183     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 184     { m_ignore, m_ignore, ms_create, m_ignore, m_ignore }
 185   },
 186   {
 187     MSG_DESTRUCT,
 188     TOK_DESTRUCT,
 189     0, MAXPARA, MFLG_SLOW, 0, NULL,
 190     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 191     { m_ignore, m_ignore, ms_destruct, m_ignore, m_ignore }
 192   },
 193   {
 194     MSG_QUIT,
 195     TOK_QUIT,
 196     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
 197     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 198     { m_quit, m_quit, ms_quit, m_quit, m_ignore }
 199   },
 200   {
 201     MSG_PART,
 202     TOK_PART,
 203     0, MAXPARA, MFLG_SLOW, 0, NULL,
 204     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 205     { m_unregistered, m_part, ms_part, m_part, m_ignore }
 206   },
 207   {
 208     MSG_TOPIC,
 209     TOK_TOPIC,
 210     0, MAXPARA, MFLG_SLOW, 0, NULL,
 211     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 212     { m_unregistered, m_topic, ms_topic, m_topic, m_ignore }
 213   },
 214   {
 215     MSG_INVITE,
 216     TOK_INVITE,
 217     0, MAXPARA, MFLG_SLOW, 0, NULL,
 218     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 219     { m_unregistered, m_invite, ms_invite, m_invite, m_ignore }
 220   },
 221   {
 222     MSG_KICK,
 223     TOK_KICK,
 224     0, MAXPARA, MFLG_SLOW, 0, NULL,
 225     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 226     { m_unregistered, m_kick, ms_kick, m_kick, m_ignore }
 227   },
 228   {
 229     MSG_WALLOPS,
 230     TOK_WALLOPS,
 231     0, MAXPARA, MFLG_SLOW, 0, NULL,
 232     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 233     { m_unregistered, m_not_oper, ms_wallops, mo_wallops, m_ignore }
 234   },
 235   {
 236     MSG_WALLUSERS,
 237     TOK_WALLUSERS,
 238     0, MAXPARA, MFLG_SLOW, 0, NULL,
 239     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 240     { m_unregistered, m_not_oper, ms_wallusers, mo_wallusers, m_ignore }
 241   },
 242   {
 243     MSG_DESYNCH,
 244     TOK_DESYNCH,
 245     0, MAXPARA, MFLG_SLOW, 0, NULL,
 246     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 247     { m_ignore, m_ignore, ms_desynch, m_ignore, m_ignore }
 248   },
 249   {
 250     MSG_PING,
 251     TOK_PING,
 252     0, MAXPARA, MFLG_SLOW, 0, NULL,
 253     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 254     { m_unregistered, m_ping, ms_ping, mo_ping, m_ignore }
 255   },
 256   {
 257     MSG_PONG,
 258     TOK_PONG,
 259     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
 260     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 261     { mr_pong, m_pong, ms_pong, m_pong, m_ignore }
 262   },
 263   {
 264     MSG_ERROR,
 265     TOK_ERROR,
 266     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
 267     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 268     { mr_error, m_ignore, ms_error, m_ignore, m_ignore }
 269   },
 270   {
 271     MSG_KILL,
 272     TOK_KILL,
 273     0, MAXPARA, MFLG_SLOW, 0, NULL,
 274     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 275     { m_unregistered, m_not_oper, ms_kill, mo_kill, m_ignore }
 276   },
 277   {
 278     MSG_USER,
 279     TOK_USER,
 280     0, MAXPARA, MFLG_SLOW, 0, NULL,
 281     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 282     { m_user, m_registered, m_ignore, m_registered, m_ignore }
 283   },
 284   {
 285     MSG_AWAY,
 286     TOK_AWAY,
 287     0, MAXPARA, MFLG_SLOW, 0, NULL,
 288     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 289     { m_unregistered, m_away, ms_away, m_away, m_ignore }
 290   },
 291   {
 292     MSG_ISON,
 293     TOK_ISON,
 294     0, 1, MFLG_SLOW, 0, NULL,
 295     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 296     { m_unregistered, m_ison, m_ignore, m_ison, m_ignore }
 297   },
 298   {
 299     MSG_SERVER,
 300     TOK_SERVER,
 301     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
 302     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 303     { mr_server, m_registered, ms_server, m_registered, m_ignore }
 304   },
 305   {
 306     MSG_SQUIT,
 307     TOK_SQUIT,
 308     0, MAXPARA, MFLG_SLOW, 0, NULL,
 309     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 310     { m_unregistered, m_not_oper, ms_squit, mo_squit, m_ignore }
 311   },
 312   {
 313     MSG_WHOIS,
 314     TOK_WHOIS,
 315     0, MAXPARA, MFLG_SLOW, 0, NULL,
 316     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 317     { m_unregistered, m_whois, ms_whois, m_whois, m_ignore }
 318   },
 319   {
 320     MSG_WHO,
 321     TOK_WHO,
 322     0, MAXPARA, MFLG_SLOW, 0, NULL,
 323     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 324     { m_unregistered, m_who, m_ignore, m_who, m_ignore }
 325   },
 326   {
 327     MSG_WHOWAS,
 328     TOK_WHOWAS,
 329     0, MAXPARA, MFLG_SLOW, 0, NULL,
 330     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 331     { m_unregistered, m_whowas, m_whowas, m_whowas, m_ignore }
 332   },
 333   {
 334     MSG_LIST,
 335     TOK_LIST,
 336     0, MAXPARA, MFLG_SLOW, 0, NULL,
 337     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 338     { m_unregistered, m_list, m_ignore, m_list, m_ignore }
 339   },
 340   {
 341     MSG_NAMES,
 342     TOK_NAMES,
 343     0, MAXPARA, MFLG_SLOW, 0, NULL,
 344     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 345     { m_unregistered, m_names, ms_names, m_names, m_ignore }
 346   },
 347   {
 348     MSG_USERHOST,
 349     TOK_USERHOST,
 350     0, 1, MFLG_SLOW, 0, NULL,
 351     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 352     { m_unregistered, m_userhost, m_ignore, m_userhost, m_ignore }
 353   },
 354   {
 355     MSG_USERIP,
 356     TOK_USERIP,
 357     0, 1, MFLG_SLOW, 0, NULL,
 358     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 359     { m_unregistered, m_userip, m_ignore, m_userip, m_ignore }
 360   },
 361   {
 362     MSG_TRACE,
 363     TOK_TRACE,
 364     0, MAXPARA, MFLG_SLOW, 0, NULL,
 365     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 366     { m_unregistered, m_trace, ms_trace, mo_trace, m_ignore }
 367   },
 368   {
 369     MSG_PASS,
 370     TOK_PASS,
 371     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
 372     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 373     { mr_pass, m_registered, m_ignore, m_registered, m_ignore }
 374   },
 375   {
 376     MSG_LUSERS,
 377     TOK_LUSERS,
 378     0, MAXPARA, MFLG_SLOW, 0, NULL,
 379     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 380     { m_unregistered, m_lusers, ms_lusers, m_lusers, m_ignore }
 381   },
 382   {
 383     MSG_TIME,
 384     TOK_TIME,
 385     0, MAXPARA, MFLG_SLOW, 0, NULL,
 386     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 387     { m_unregistered, m_time, m_time, m_time, m_ignore }
 388   },
 389   {
 390     MSG_SETTIME,
 391     TOK_SETTIME,
 392     0, MAXPARA, MFLG_SLOW, 0, NULL,
 393     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 394     { m_unregistered, m_ignore, ms_settime, mo_settime, m_ignore }
 395   },
 396   {
 397     MSG_RPING,
 398     TOK_RPING,
 399     0, MAXPARA, MFLG_SLOW, 0, NULL,
 400     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 401     { m_unregistered, m_not_oper, ms_rping, mo_rping, m_ignore }
 402   },
 403   {
 404     MSG_RPONG,
 405     TOK_RPONG,
 406     0, MAXPARA, MFLG_SLOW, 0, NULL,
 407     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 408     { m_unregistered, m_ignore, ms_rpong, m_ignore, m_ignore }
 409   },
 410   {
 411     MSG_OPER,
 412     TOK_OPER,
 413     0, MAXPARA, MFLG_SLOW, 0, NULL,
 414     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 415     { m_unregistered, m_oper, ms_oper, mo_oper, m_ignore }
 416   },
 417   {
 418     MSG_CONNECT,
 419     TOK_CONNECT,
 420     0, MAXPARA, MFLG_SLOW, 0, NULL,
 421     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 422     { m_unregistered, m_not_oper, ms_connect, mo_connect, m_ignore }
 423   },
 424   {
 425     MSG_MAP,
 426     TOK_MAP,
 427     0, MAXPARA, MFLG_SLOW, 0, NULL,
 428     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 429     { m_unregistered, m_map, m_ignore, m_map, m_ignore }
 430   },
 431   {
 432     MSG_VERSION,
 433     TOK_VERSION,
 434     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
 435     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 436     { m_version, m_version, ms_version, mo_version, m_ignore }
 437   },
 438   {
 439     MSG_STATS,
 440     TOK_STATS,
 441     0, MAXPARA, MFLG_SLOW, 0, NULL,
 442     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 443     { m_unregistered, m_stats, m_stats, m_stats, m_ignore }
 444   },
 445   {
 446     MSG_LINKS,
 447     TOK_LINKS,
 448     0, MAXPARA, MFLG_SLOW, 0, NULL,
 449     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 450     { m_unregistered, m_links, ms_links, m_links, m_ignore }
 451   },
 452   {
 453     MSG_ADMIN,
 454     TOK_ADMIN,
 455     0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,  NULL,
 456     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 457     { m_admin, m_admin, ms_admin, mo_admin, m_ignore }
 458   },
 459   {
 460     MSG_HELP,
 461     TOK_HELP,
 462     0, MAXPARA, MFLG_SLOW, 0, NULL,
 463     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 464     { m_unregistered, m_help, m_ignore, m_help, m_ignore }
 465   },
 466   {
 467     MSG_INFO,
 468     TOK_INFO,
 469     0, MAXPARA, MFLG_SLOW, 0, NULL,
 470     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 471     { m_unregistered, m_info, ms_info, mo_info, m_ignore }
 472   },
 473   {
 474     MSG_MOTD,
 475     TOK_MOTD,
 476     0, MAXPARA, MFLG_SLOW, 0, NULL,
 477     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 478     { m_unregistered, m_motd, m_motd, m_motd, m_ignore }
 479   },
 480   {
 481     MSG_CLOSE,
 482     TOK_CLOSE,
 483     0, MAXPARA, MFLG_SLOW, 0, NULL,
 484     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 485     { m_unregistered, m_not_oper, m_ignore, mo_close, m_ignore }
 486   },
 487   {
 488     MSG_SILENCE,
 489     TOK_SILENCE,
 490     0, MAXPARA, MFLG_SLOW, 0, NULL,
 491     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 492     { m_unregistered, m_silence, ms_silence, m_silence, m_ignore }
 493   },
 494   {
 495     MSG_GLINE,
 496     TOK_GLINE,
 497     0, MAXPARA,         0, 0, NULL,
 498     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 499     { m_unregistered, m_gline, ms_gline, mo_gline, m_ignore }
 500   },
 501   {
 502     MSG_JUPE,
 503     TOK_JUPE,
 504     0, MAXPARA, MFLG_SLOW, 0, NULL,
 505     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 506     { m_unregistered, m_not_oper, ms_jupe, mo_jupe, m_ignore }
 507   },
 508   {
 509     MSG_OPMODE,
 510     TOK_OPMODE,
 511     0, MAXPARA, MFLG_SLOW, 0, NULL,
 512     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 513     { m_unregistered, m_not_oper, ms_opmode, mo_opmode, m_ignore }
 514   },
 515   {
 516     MSG_CLEARMODE,
 517     TOK_CLEARMODE,
 518     0, MAXPARA, MFLG_SLOW, 0, NULL,
 519     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 520     { m_unregistered, m_not_oper, ms_clearmode, mo_clearmode, m_ignore }
 521   },
 522   {
 523     MSG_UPING,
 524     TOK_UPING,
 525     0, MAXPARA, MFLG_SLOW, 0, NULL,
 526     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 527     { m_unregistered, m_not_oper, ms_uping, mo_uping, m_ignore }
 528   },
 529   {
 530     MSG_END_OF_BURST,
 531     TOK_END_OF_BURST,
 532     0, MAXPARA, MFLG_SLOW, 0, NULL,
 533     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 534     { m_ignore, m_ignore, ms_end_of_burst, m_ignore, m_ignore }
 535   },
 536   {
 537     MSG_END_OF_BURST_ACK,
 538     TOK_END_OF_BURST_ACK,
 539     0, MAXPARA, MFLG_SLOW, 0, NULL,
 540     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 541     { m_ignore, m_ignore, ms_end_of_burst_ack, m_ignore, m_ignore }
 542   },
 543   {
 544     MSG_HASH,
 545     TOK_HASH,
 546     0, MAXPARA, MFLG_SLOW, 0, NULL,
 547     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 548     { m_unregistered, m_hash, m_hash, m_hash, m_ignore }
 549   },
 550   {
 551     MSG_REHASH,
 552     TOK_REHASH,
 553     0, MAXPARA, MFLG_SLOW, 0, NULL,
 554     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 555     { m_unregistered, m_not_oper, m_ignore, mo_rehash, m_ignore }
 556   },
 557   {
 558     MSG_RESTART,
 559     TOK_RESTART,
 560     0, MAXPARA, MFLG_SLOW, 0, NULL,
 561     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 562     { m_unregistered, m_not_oper, m_ignore, mo_restart, m_ignore }
 563   },
 564   {
 565     MSG_DIE,
 566     TOK_DIE,
 567     0, MAXPARA, MFLG_SLOW, 0, NULL,
 568     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 569     { m_unregistered, m_not_oper, m_ignore, mo_die, m_ignore }
 570   },
 571   {
 572     MSG_PROTO,
 573     TOK_PROTO,
 574     0, MAXPARA, MFLG_SLOW, 0, NULL,
 575     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 576     { m_proto, m_proto, m_proto, m_proto, m_ignore }
 577   },
 578   {
 579     MSG_SET,
 580     TOK_SET,
 581     0, MAXPARA, MFLG_SLOW, 0, NULL,
 582     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 583     { m_unregistered, m_not_oper, m_ignore, mo_set, m_ignore }
 584   },
 585   {
 586     MSG_RESET,
 587     TOK_RESET,
 588     0, MAXPARA, MFLG_SLOW, 0, NULL,
 589     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 590     { m_unregistered, m_not_oper, m_ignore, mo_reset, m_ignore }
 591   },
 592   {
 593     MSG_GET,
 594     TOK_GET,
 595     0, MAXPARA, MFLG_SLOW, 0, NULL,
 596     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 597     { m_unregistered, m_not_oper, m_ignore, mo_get, m_ignore }
 598   },
 599   {
 600     MSG_PRIVS,
 601     TOK_PRIVS,
 602     0, MAXPARA, MFLG_SLOW, 0, NULL,
 603     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 604     { m_unregistered, m_not_oper, ms_privs, mo_privs, m_ignore }
 605   },
 606   {
 607     MSG_ACCOUNT,
 608     TOK_ACCOUNT,
 609     0, MAXPARA, MFLG_SLOW, 0, NULL,
 610     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 611     { m_ignore, m_ignore, ms_account, m_ignore, m_ignore }
 612   },
 613   {
 614     MSG_ASLL,
 615     TOK_ASLL,
 616     0, MAXPARA, MFLG_SLOW, 0, NULL,
 617     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 618     { m_ignore, m_not_oper, ms_asll, mo_asll, m_ignore }
 619    },
 620 #if WE_HAVE_A_REAL_CAPABILITY_NOW
 621   {
 622     MSG_CAP,
 623     TOK_CAP,
 624     0, MAXPARA, 0, 0, NULL,
 625     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 626     { m_cap, m_cap, m_ignore, m_cap, m_ignore }
 627   },
 628 #endif
 629   /* This command is an alias for QUIT during the unregistered part of
 630    * of the server.  This is because someone jumping via a broken web
 631    * proxy will send a 'POST' as their first command - which we will
 632    * obviously disconnect them immediately for, stopping people abusing
 633    * open gateways
 634    */
 635   {
 636     MSG_POST,
 637     TOK_POST,
 638     0, MAXPARA, MFLG_SLOW, 0, NULL,
 639     /* UNREG, CLIENT, SERVER, OPER, SERVICE */
 640     { m_quit, m_ignore, m_ignore, m_ignore, m_ignore }
 641   },
 642   { 0 }
 643 };
 644
 645 /** Array of command parameters. */
 646 static char *para[MAXPARA + 2]; /* leave room for prefix and null */
 647
 648
 649 /** Add a message to the lookup trie.
 650  * @param[in,out] mtree_p Trie node to insert under.
 651  * @param[in] msg_p Message to insert.
 652  * @param[in] cmd Text of command to insert.
 653  */
 654 void
 655 add_msg_element(struct MessageTree *mtree_p, struct Message *msg_p, char *cmd)
 656 {
 657   struct MessageTree *ntree_p;
 658
 659   if (*cmd == '\0')
 660   {
 661     mtree_p->msg = msg_p;
 662     return;
 663   }
 664
 665   if ((ntree_p = mtree_p->pointers[*cmd & (MAXPTRLEN-1)]) != NULL)
 666   {
 667     add_msg_element(ntree_p, msg_p, cmd+1);
 668   }
 669   else
 670   {
 671     ntree_p = (struct MessageTree *)MyCalloc(sizeof(struct MessageTree), 1);
 672     mtree_p->pointers[*cmd & (MAXPTRLEN-1)] = ntree_p;
 673     add_msg_element(ntree_p, msg_p, cmd+1);
 674   }
 675 }
 676
 677 /** Remove a message from the lookup trie.
 678  * @param[in,out] mtree_p Trie node to remove command from.
 679  * @param[in] cmd Text of command to remove.
 680  */
 681 struct MessageTree *
 682 del_msg_element(struct MessageTree *mtree_p, char *cmd)
 683 {
 684   int slot = *cmd & (MAXPTRLEN-1);
 685
 686   /* Either remove leaf message or from appropriate child. */
 687   if (*cmd == '\0')
 688     mtree_p->msg = NULL;
 689   else
 690     mtree_p->pointers[slot] = del_msg_element(mtree_p->pointers[slot], cmd + 1);
 691
 692   /* If current message or any child still exists, keep this node. */
 693   if (mtree_p->msg)
 694     return mtree_p;
 695   for (slot = 0; slot < MAXPTRLEN; ++slot)
 696     if (mtree_p->pointers[slot])
 697       return mtree_p;
 698
 699   /* Otherwise, if we're not a root node, free it and return null. */
 700   if (mtree_p != &msg_tree && mtree_p != &tok_tree)
 701     MyFree(mtree_p);
 702   return NULL;
 703 }
 704
 705 /** Initialize the message lookup trie with all known commands. */
 706 void
 707 initmsgtree(void)
 708 {
 709   int i;
 710
 711   memset(&msg_tree, 0, sizeof(msg_tree));
 712   memset(&tok_tree, 0, sizeof(tok_tree));
 713
 714   for (i = 0; msgtab[i].cmd != NULL ; i++)
 715   {
 716     add_msg_element(&msg_tree, &msgtab[i], msgtab[i].cmd);
 717     add_msg_element(&tok_tree, &msgtab[i], msgtab[i].tok);
 718   }
 719 }
 720
 721 /** Look up a command in the message trie.
 722  * @param cmd Text of command to look up.
 723  * @param root Root of message trie.
 724  * @return Pointer to matching message, or NULL if non exists.
 725  */
 726 static struct Message *
 727 msg_tree_parse(char *cmd, struct MessageTree *root)
 728 {
 729   struct MessageTree *mtree;
 730
 731   for (mtree = root; mtree; mtree = mtree->pointers[(*cmd++) & (MAXPTRLEN-1)]) {
 732       if (*cmd == '\0' && mtree->msg)
 733           return mtree->msg;
 734       else if (!IsAlpha(*cmd))
 735           return NULL;
 736   }
 737   return NULL;
 738 }
 739
 740 /** Registers a service mapping to the pseudocommand handler.
 741  * @param[in] map Service mapping to add.
 742  * @return Non-zero on success; zero if a command already used the name.
 743  */
 744 int register_mapping(struct s_map *map)
 745 {
 746   struct Message *msg;
 747
 748   if (msg_tree_parse(map->command, &msg_tree))
 749     return 0;
 750
 751   msg = (struct Message *)MyMalloc(sizeof(struct Message));
 752   msg->cmd = map->command;
 753   msg->tok = map->command;
 754   msg->count = 0;
 755   msg->parameters = 2;
 756   msg->flags = MFLG_EXTRA;
 757   if (!(map->flags & SMAP_FAST))
 758     msg->flags |= MFLG_SLOW;
 759   msg->bytes = 0;
 760   msg->extra = map;
 761
 762   msg->handlers[UNREGISTERED_HANDLER] = m_ignore;
 763   msg->handlers[CLIENT_HANDLER] = m_pseudo;
 764   msg->handlers[SERVER_HANDLER] = m_ignore;
 765   msg->handlers[OPER_HANDLER]   = m_pseudo;
 766   msg->handlers[SERVICE_HANDLER] = m_ignore;
 767
 768   add_msg_element(&msg_tree, msg, msg->cmd);
 769   map->msg = msg;
 770
 771   return 1;
 772 }
 773
 774 /** Removes a service mapping.
 775  * @param[in] map Service mapping to remove.
 776  * @return Non-zero on success; zero if no command used the name.
 777  */
 778 int unregister_mapping(struct s_map *map)
 779 {
 780   if (!msg_tree_parse(map->command, &msg_tree))
 781   {
 782     /* This simply should never happen. */
 783     assert(0);
 784     return 0;
 785   }
 786
 787   del_msg_element(&msg_tree, map->msg->cmd);
 788
 789   map->msg->extra = NULL;
 790   MyFree(map->msg);
 791   map->msg = NULL;
 792
 793   return 1;
 794 }
 795
 796 /** Parse a line of data from a user.
 797  * NOTE: parse_*() should not be called recursively by any other
 798  * functions!
 799  * @param[in] cptr Client that sent the data.
 800  * @param[in] buffer Start of input line.
 801  * @param[in] bufend End of input line.
 802  * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
 803  * handler returns it.
 804  */
 805 int
 806 parse_client(struct Client *cptr, char *buffer, char *bufend)
 807 {
 808   struct Client*  from = cptr;
 809   char*           ch;
 810   char*           s;
 811   int             i;
 812   int             paramcount;
 813   int             noprefix = 0;
 814   struct Message* mptr;
 815   MessageHandler  handler = 0;
 816
 817   Debug((DEBUG_DEBUG, "Client Parsing: %s", buffer));
 818
 819   if (IsDead(cptr))
 820     return 0;
 821
 822   para[0] = cli_name(from);
 823   for (ch = buffer; *ch == ' '; ch++);  /* Eat leading spaces */
 824   if (*ch == ':')               /* Is any client doing this ? */
 825   {
 826     for (++ch; *ch && *ch != ' '; ++ch)
 827       ; /* Ignore sender prefix from client */
 828     while (*ch == ' ')
 829       ch++;                     /* Advance to command */
 830   }
 831   else
 832     noprefix = 1;
 833   if (*ch == '\0')
 834   {
 835     ServerStats->is_empt++;
 836     Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
 837         cli_name(cptr), cli_name(from)));
 838     return (-1);
 839   }
 840
 841   if ((s = strchr(ch, ' ')))
 842     *s++ = '\0';
 843
 844   if ((mptr = msg_tree_parse(ch, &msg_tree)) == NULL)
 845   {
 846     /*
 847      * Note: Give error message *only* to recognized
 848      * persons. It's a nightmare situation to have
 849      * two programs sending "Unknown command"'s or
 850      * equivalent to each other at full blast....
 851      * If it has got to person state, it at least
 852      * seems to be well behaving. Perhaps this message
 853      * should never be generated, though...  --msa
 854      * Hm, when is the buffer empty -- if a command
 855      * code has been found ?? -Armin
 856      */
 857     if (buffer[0] != '\0')
 858     {
 859       if (IsUser(from))
 860         send_reply(from, ERR_UNKNOWNCOMMAND, ch);
 861       Debug((DEBUG_ERROR, "Unknown (%s) from %s",
 862             ch, get_client_name(cptr, HIDE_IP)));
 863     }
 864     ServerStats->is_unco++;
 865     return (-1);
 866   }
 867
 868   paramcount = mptr->parameters;
 869   i = bufend - ((s) ? s : ch);
 870   mptr->bytes += i;
 871   if ((mptr->flags & MFLG_SLOW) || !IsAnOper(cptr))
 872     cli_since(cptr) += (2 + i / 120);
 873   /*
 874    * Allow only 1 msg per 2 seconds
 875    * (on average) to prevent dumping.
 876    * to keep the response rate up,
 877    * bursts of up to 5 msgs are allowed
 878    * -SRB
 879    */
 880
 881   /*
 882    * Must the following loop really be so devious? On
 883    * surface it splits the message to parameters from
 884    * blank spaces. But, if paramcount has been reached,
 885    * the rest of the message goes into this last parameter
 886    * (about same effect as ":" has...) --msa
 887    */
 888
 889   /* Note initially true: s==NULL || *(s-1) == '\0' !! */
 890
 891   if (mptr->flags & MFLG_EXTRA) {
 892     /* This is a horrid kludge to avoid changing the command handler
 893      * argument list. */
 894     para[1] = (char*)mptr->extra;
 895     i = 1;
 896   } else {
 897     i = 0;
 898   }
 899   if (s)
 900   {
 901     if (paramcount > MAXPARA)
 902       paramcount = MAXPARA;
 903     for (;;)
 904     {
 905       /*
 906        * Never "FRANCE " again!! ;-) Clean
 907        * out *all* blanks.. --msa
 908        */
 909       while (*s == ' ')
 910         *s++ = '\0';
 911
 912       if (*s == '\0')
 913         break;
 914       if (*s == ':')
 915       {
 916         /*
 917          * The rest is single parameter--can
 918          * include blanks also.
 919          */
 920         para[++i] = s + 1;
 921         break;
 922       }
 923       para[++i] = s;
 924       if (i >= paramcount)
 925         break;
 926       for (; *s != ' ' && *s; s++);
 927     }
 928   }
 929   para[++i] = NULL;
 930   ++mptr->count;
 931
 932   handler = mptr->handlers[cli_handler(cptr)];
 933   assert(0 != handler);
 934
 935   if (!feature_bool(FEAT_IDLE_FROM_MSG) && IsUser(cptr) &&
 936       handler != m_ping && handler != m_ignore)
 937     cli_user(from)->last = CurrentTime;
 938
 939   return (*handler) (cptr, from, i, para);
 940 }
 941
 942 /** Parse a line of data from a server.
 943  * @param[in] cptr Client that sent the data.
 944  * @param[in] buffer Start of input line.
 945  * @param[in] bufend End of input line.
 946  * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
 947  * handler returns it.
 948  */
 949 int parse_server(struct Client *cptr, char *buffer, char *bufend)
 950 {
 951   struct Client*  from = cptr;
 952   char*           ch = buffer;
 953   char*           s;
 954   int             len;
 955   int             i;
 956   int             numeric = 0;
 957   int             paramcount;
 958   struct Message* mptr;
 959
 960   Debug((DEBUG_DEBUG, "Server Parsing: %s", buffer));
 961
 962   if (IsDead(cptr))
 963     return 0;
 964
 965   para[0] = cli_name(from);
 966
 967   /*
 968    * A server ALWAYS sends a prefix. When it starts with a ':' it's the
 969    * protocol 9 prefix: a nick or a server name. Otherwise it's a numeric
 970    * nick or server
 971    */
 972   if (*ch == ':')
 973   {
 974     /* Let para[0] point to the name of the sender */
 975     para[0] = ch + 1;
 976     if (!(ch = strchr(ch, ' ')))
 977       return -1;
 978     *ch++ = '\0';
 979
 980     /* And let `from' point to its client structure,
 981        opps.. a server is _also_ a client --Nem */
 982     from = FindClient(para[0]);
 983
 984     /*
 985      * If the client corresponding to the
 986      * prefix is not found. We must ignore it,
 987      * it is simply a lagged message traveling
 988      * upstream a SQUIT that removed the client
 989      * --Run
 990      */
 991     if (from == NULL)
 992     {
 993       Debug((DEBUG_NOTICE, "Unknown prefix (%s)(%s) from (%s)",
 994           para[0], buffer, cli_name(cptr)));
 995       ++ServerStats->is_unpf;
 996       while (*ch == ' ')
 997         ch++;
 998       /*
 999        * However, the only thing that MUST be
1000        * allowed to travel upstream against an
1001        * squit, is an SQUIT itself (the timestamp
1002        * protects us from being used wrong)
1003        */
1004       if (ch[1] == 'Q')
1005       {
1006         para[0] = cli_name(cptr);
1007         from = cptr;
1008       }
1009       else
1010         return 0;
1011     }
1012     else if (cli_from(from) != cptr)
1013     {
1014       ++ServerStats->is_wrdi;
1015       Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1016           buffer, cli_name(cptr)));
1017       return 0;
1018     }
1019   }
1020   else
1021   {
1022     char numeric_prefix[6];
1023     int  i;
1024     for (i = 0; i < 5; ++i)
1025     {
1026       if ('\0' == ch[i] || ' ' == (numeric_prefix[i] = ch[i]))
1027       {
1028         break;
1029       }
1030     }
1031     numeric_prefix[i] = '\0';
1032
1033     /*
1034      * We got a numeric nick as prefix
1035      * 1 or 2 character prefixes are from servers
1036      * 3 or 5 chars are from clients
1037      */
1038     if (0 == i)
1039     {
1040       protocol_violation(cptr,"Missing Prefix");
1041       from = cptr;
1042     }
1043     else if (' ' == ch[1] || ' ' == ch[2])
1044       from = FindNServer(numeric_prefix);
1045     else
1046       from = findNUser(numeric_prefix);
1047
1048     do
1049     {
1050       ++ch;
1051     }
1052     while (*ch != ' ' && *ch);
1053
1054     /*
1055      * If the client corresponding to the
1056      * prefix is not found. We must ignore it,
1057      * it is simply a lagged message traveling
1058      * upstream a SQUIT that removed the client
1059      * --Run
1060      * There turned out to be other reasons that
1061      * a prefix is unknown, needing an upstream
1062      * KILL.  Also, next to an SQUIT we better
1063      * allow a KILL to pass too.
1064      * --Run
1065      */
1066     if (from == NULL)
1067     {
1068       ServerStats->is_unpf++;
1069       while (*ch == ' ')
1070         ch++;
1071       if (*ch == 'N' && (ch[1] == ' ' || ch[1] == 'I'))
1072         /* Only sent a KILL for a nick change */
1073       {
1074         struct Client *server;
1075         /* Kill the unknown numeric prefix upstream if
1076          * it's server still exists: */
1077         if ((server = FindNServer(numeric_prefix)) && cli_from(server) == cptr)
1078           sendcmdto_one(&me, CMD_KILL, cptr, "%s :%s (Unknown numeric nick)",
1079                         numeric_prefix, cli_name(&me));
1080       }
1081       /*
1082        * Things that must be allowed to travel
1083        * upstream against an squit:
1084        */
1085       if (ch[1] == 'Q' || (*ch == 'D' && ch[1] == ' ') ||
1086           (*ch == 'K' && ch[2] == 'L'))
1087         from = cptr;
1088       else
1089         return 0;
1090     }
1091
1092     /* Let para[0] point to the name of the sender */
1093     para[0] = cli_name(from);
1094
1095     if (cli_from(from) != cptr)
1096     {
1097       ServerStats->is_wrdi++;
1098       Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1099           buffer, cli_name(cptr)));
1100       return 0;
1101     }
1102   }
1103
1104   while (*ch == ' ')
1105     ch++;
1106   if (*ch == '\0')
1107   {
1108     ServerStats->is_empt++;
1109     Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
1110         cli_name(cptr), cli_name(from)));
1111     return (-1);
1112   }
1113
1114   /*
1115    * Extract the command code from the packet.   Point s to the end
1116    * of the command code and calculate the length using pointer
1117    * arithmetic.  Note: only need length for numerics and *all*
1118    * numerics must have parameters and thus a space after the command
1119    * code. -avalon
1120    */
1121   s = strchr(ch, ' ');          /* s -> End of the command code */
1122   len = (s) ? (s - ch) : 0;
1123   if (len == 3 && IsDigit(*ch))
1124   {
1125     numeric = (*ch - '0') * 100 + (*(ch + 1) - '0') * 10 + (*(ch + 2) - '0');
1126     paramcount = 2; /* destination, and the rest of it */
1127     ServerStats->is_num++;
1128     mptr = NULL;                /* Init. to avoid stupid compiler warning :/ */
1129   }
1130   else
1131   {
1132     if (s)
1133       *s++ = '\0';
1134
1135     /* Version      Receive         Send
1136      * 2.9          Long            Long
1137      * 2.10.0       Tkn/Long        Long
1138      * 2.10.10      Tkn/Long        Tkn
1139      * 2.10.20      Tkn             Tkn
1140      *
1141      * Clients/unreg servers always receive/
1142      * send long commands   -record
1143      *
1144      * And for the record, this trie parser really does not care. - Dianora
1145      */
1146
1147     mptr = msg_tree_parse(ch, &tok_tree);
1148
1149     if (mptr == NULL)
1150     {
1151       mptr = msg_tree_parse(ch, &msg_tree);
1152     }
1153
1154     if (mptr == NULL)
1155     {
1156       /*
1157        * Note: Give error message *only* to recognized
1158        * persons. It's a nightmare situation to have
1159        * two programs sending "Unknown command"'s or
1160        * equivalent to each other at full blast....
1161        * If it has got to person state, it at least
1162        * seems to be well behaving. Perhaps this message
1163        * should never be generated, though...   --msa
1164        * Hm, when is the buffer empty -- if a command
1165        * code has been found ?? -Armin
1166        */
1167 #ifdef DEBUGMODE
1168       if (buffer[0] != '\0')
1169       {
1170         Debug((DEBUG_ERROR, "Unknown (%s) from %s",
1171               ch, get_client_name(cptr, HIDE_IP)));
1172       }
1173 #endif
1174       ServerStats->is_unco++;
1175       return (-1);
1176     }
1177
1178     paramcount = mptr->parameters;
1179     i = bufend - ((s) ? s : ch);
1180     mptr->bytes += i;
1181   }
1182   /*
1183    * Must the following loop really be so devious? On
1184    * surface it splits the message to parameters from
1185    * blank spaces. But, if paramcount has been reached,
1186    * the rest of the message goes into this last parameter
1187    * (about same effect as ":" has...) --msa
1188    */
1189
1190   /* Note initially true: s==NULL || *(s-1) == '\0' !! */
1191
1192   i = 0;
1193   if (s)
1194   {
1195     if (paramcount > MAXPARA)
1196       paramcount = MAXPARA;
1197     for (;;)
1198     {
1199       /*
1200        * Never "FRANCE " again!! ;-) Clean
1201        * out *all* blanks.. --msa
1202        */
1203       while (*s == ' ')
1204         *s++ = '\0';
1205
1206       if (*s == '\0')
1207         break;
1208       if (*s == ':')
1209       {
1210         /*
1211          * The rest is single parameter--can
1212          * include blanks also.
1213          */
1214         if (numeric)
1215           para[++i] = s; /* preserve the colon to make do_numeric happy */
1216         else
1217           para[++i] = s + 1;
1218         break;
1219       }
1220       para[++i] = s;
1221       if (i >= paramcount)
1222         break;
1223       for (; *s != ' ' && *s; s++);
1224     }
1225   }
1226   para[++i] = NULL;
1227   if (numeric)
1228     return (do_numeric(numeric, (*buffer != ':'), cptr, from, i, para));
1229   mptr->count++;
1230
1231   return (*mptr->handlers[cli_handler(cptr)]) (cptr, from, i, para);
1232 }