ircd/m_who.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_who.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  *
   6  * See file AUTHORS in IRC package for additional names of
   7  * the programmers.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 1, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * $Id: m_who.c,v 1.22.2.1 2005/10/01 03:45:19 entrope Exp $
  24  */
  25
  26 /*
  27  * m_functions execute protocol messages on this server:
  28  *
  29  *    cptr    is always NON-NULL, pointing to a *LOCAL* client
  30  *            structure (with an open socket connected!). This
  31  *            identifies the physical socket where the message
  32  *            originated (or which caused the m_function to be
  33  *            executed--some m_functions may call others...).
  34  *
  35  *    sptr    is the source of the message, defined by the
  36  *            prefix part of the message if present. If not
  37  *            or prefix not found, then sptr==cptr.
  38  *
  39  *            (!IsServer(cptr)) => (cptr == sptr), because
  40  *            prefixes are taken *only* from servers...
  41  *
  42  *            (IsServer(cptr))
  43  *                    (sptr == cptr) => the message didn't
  44  *                    have the prefix.
  45  *
  46  *                    (sptr != cptr && IsServer(sptr) means
  47  *                    the prefix specified servername. (?)
  48  *
  49  *                    (sptr != cptr && !IsServer(sptr) means
  50  *                    that message originated from a remote
  51  *                    user (not local).
  52  *
  53  *            combining
  54  *
  55  *            (!IsServer(sptr)) means that, sptr can safely
  56  *            taken as defining the target structure of the
  57  *            message in this server.
  58  *
  59  *    *Always* true (if 'parse' and others are working correct):
  60  *
  61  *    1)      sptr->from == cptr  (note: cptr->from == cptr)
  62  *
  63  *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
  64  *            *cannot* be a local connection, unless it's
  65  *            actually cptr!). [MyConnect(x) should probably
  66  *            be defined as (x == x->from) --msa ]
  67  *
  68  *    parc    number of variable parameter strings (if zero,
  69  *            parv is allowed to be NULL)
  70  *
  71  *    parv    a NULL terminated list of parameter pointers,
  72  *
  73  *                    parv[0], sender (prefix string), if not present
  74  *                            this points to an empty string.
  75  *                    parv[1]...parv[parc-1]
  76  *                            pointers to additional parameters
  77  *                    parv[parc] == NULL, *always*
  78  *
  79  *            note:   it is guaranteed that parv[0]..parv[parc-1] are all
  80  *                    non-NULL pointers.
  81  */
  82 #include "config.h"
  83
  84 #include "channel.h"
  85 #include "client.h"
  86 #include "hash.h"
  87 #include "ircd.h"
  88 #include "ircd_chattr.h"
  89 #include "ircd_features.h"
  90 #include "ircd_log.h"
  91 #include "ircd_reply.h"
  92 #include "ircd_string.h"
  93 #include "match.h"
  94 #include "numeric.h"
  95 #include "numnicks.h"
  96 #include "send.h"
  97 #include "whocmds.h"
  98
  99 /* #include <assert.h> -- Now using assert in ircd_log.h */
 100 #include <string.h>
 101
 102
 103 /*
 104  * A little spin-marking utility to tell us which clients we have already
 105  * processed and which not
 106  */
 107 static int who_marker = 0;
 108 static void move_marker(void)
 109 {
 110   if (!++who_marker)
 111   {
 112     struct Client *cptr = GlobalClientList;
 113     while (cptr)
 114     {
 115       cli_marker(cptr) = 0;
 116       cptr = cli_next(cptr);
 117     }
 118     who_marker++;
 119   }
 120 }
 121
 122 #define CheckMark(x, y) ((x == y) ? 0 : (x = y))
 123 #define Process(cptr) CheckMark(cli_marker(cptr), who_marker)
 124
 125 /*
 126  * m_who - generic message handler
 127  *
 128  *  parv[0] = sender prefix
 129  *  parv[1] = nickname mask list
 130  *  parv[2] = additional selection flag, only 'o' for now.
 131  *            and %flags to specify what fields to output
 132  *            plus a ,querytype if the t flag is specified
 133  *            so the final thing will be like o%tnchu,777
 134  *  parv[3] = _optional_ parameter that overrides parv[1]
 135  *            This can be used as "/quote who foo % :The Black Hacker
 136  *            to find me, parv[3] _can_ contain spaces !.
 137  */
 138 int m_who(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 139 {
 140   char *mask;           /* The mask we are looking for              */
 141   char ch;                      /* Scratch char register                    */
 142   struct Channel *chptr;                /* Channel to show                          */
 143   struct Client *acptr;         /* Client to show                           */
 144
 145   int bitsel;                   /* Mask of selectors to apply               */
 146   int matchsel;                 /* Which fields the match should apply on    */
 147   int counter;                  /* Query size counter,
 148                                    initially used to count fields           */
 149   int commas;                   /* Does our mask contain any comma ?
 150                                    If so is a list..                        */
 151   int fields;                   /* Mask of fields to show                   */
 152   int isthere = 0;              /* When this set the user is member of chptr */
 153   char *nick;                   /* Single element extracted from
 154                                    the mask list                            */
 155   char *p;                      /* Scratch char pointer                     */
 156   char *qrt;                    /* Pointer to the query type                */
 157   static char mymask[512];      /* To save the mask before corrupting it    */
 158
 159   /* Let's find where is our mask, and if actually contains something */
 160   mask = ((parc > 1) ? parv[1] : 0);
 161   if (parc > 3 && parv[3])
 162     mask = parv[3];
 163   if (mask && ((mask[0] == '\0') ||
 164       (mask[1] == '\0' && ((mask[0] == '0') || (mask[0] == '*')))))
 165     mask = 0;
 166
 167   /* Evaluate the flags now, we consider the second parameter
 168      as "matchFlags%fieldsToInclude,querytype"           */
 169   bitsel = fields = counter = matchsel = 0;
 170   qrt = 0;
 171   if (parc > 2 && parv[2] && *parv[2])
 172   {
 173     p = parv[2];
 174     while (((ch = *(p++))) && (ch != '%') && (ch != ','))
 175       switch (ch)
 176       {
 177         case 'd':
 178         case 'D':
 179           bitsel |= WHOSELECT_DELAY;
 180           continue;
 181         case 'o':
 182         case 'O':
 183           bitsel |= WHOSELECT_OPER;
 184           continue;
 185         case 'x':
 186         case 'X':
 187           bitsel |= WHOSELECT_EXTRA;
 188           if (HasPriv(sptr, PRIV_WHOX))
 189             log_write(LS_WHO, L_INFO, LOG_NOSNOTICE, "%#C WHO %s %s", sptr,
 190                       (BadPtr(parv[3]) ? parv[1] : parv[3]), parv[2]);
 191           continue;
 192         case 'n':
 193         case 'N':
 194           matchsel |= WHO_FIELD_NIC;
 195           continue;
 196         case 'u':
 197         case 'U':
 198           matchsel |= WHO_FIELD_UID;
 199           continue;
 200         case 'h':
 201         case 'H':
 202           matchsel |= WHO_FIELD_HOS;
 203           continue;
 204         case 'i':
 205         case 'I':
 206           matchsel |= WHO_FIELD_NIP;
 207           continue;
 208         case 's':
 209         case 'S':
 210           matchsel |= WHO_FIELD_SER;
 211           continue;
 212         case 'r':
 213         case 'R':
 214           matchsel |= WHO_FIELD_REN;
 215           continue;
 216         case 'a':
 217         case 'A':
 218           matchsel |= WHO_FIELD_ACC;
 219           continue;
 220       }
 221     if (ch == '%')
 222       while ((ch = *p++) && (ch != ','))
 223       {
 224         counter++;
 225         switch (ch)
 226         {
 227           case 'c':
 228           case 'C':
 229             fields |= WHO_FIELD_CHA;
 230             break;
 231           case 'd':
 232           case 'D':
 233             fields |= WHO_FIELD_DIS;
 234             break;
 235           case 'f':
 236           case 'F':
 237             fields |= WHO_FIELD_FLA;
 238             break;
 239           case 'h':
 240           case 'H':
 241             fields |= WHO_FIELD_HOS;
 242             break;
 243           case 'i':
 244           case 'I':
 245             fields |= WHO_FIELD_NIP;
 246             break;
 247           case 'l':
 248           case 'L':
 249             fields |= WHO_FIELD_IDL;
 250           case 'n':
 251           case 'N':
 252             fields |= WHO_FIELD_NIC;
 253             break;
 254           case 'r':
 255           case 'R':
 256             fields |= WHO_FIELD_REN;
 257             break;
 258           case 's':
 259           case 'S':
 260             fields |= WHO_FIELD_SER;
 261             break;
 262           case 't':
 263           case 'T':
 264             fields |= WHO_FIELD_QTY;
 265             break;
 266           case 'u':
 267           case 'U':
 268             fields |= WHO_FIELD_UID;
 269             break;
 270           case 'a':
 271           case 'A':
 272             fields |= WHO_FIELD_ACC;
 273             break;
 274           default:
 275             break;
 276         }
 277       };
 278     if (ch)
 279       qrt = p;
 280   }
 281
 282   if (!matchsel)
 283     matchsel = WHO_FIELD_DEF;
 284   if (!fields)
 285     counter = 7;
 286
 287   if (feature_bool(FEAT_HIS_WHO_SERVERNAME) && !IsAnOper(sptr))
 288     matchsel &= ~WHO_FIELD_SER;
 289
 290   if (qrt && (fields & WHO_FIELD_QTY))
 291   {
 292     p = qrt;
 293     if (!((*p > '9') || (*p < '0')))
 294       p++;
 295     if (!((*p > '9') || (*p < '0')))
 296       p++;
 297     if (!((*p > '9') || (*p < '0')))
 298       p++;
 299     *p = '\0';
 300   }
 301   else
 302     qrt = 0;
 303
 304   /* I'd love to add also a check on the number of matches fields per time */
 305   counter = (2048 / (counter + 4));
 306   if (mask && (strlen(mask) > 510))
 307     mask[510] = '\0';
 308   move_marker();
 309   commas = (mask && strchr(mask, ','));
 310
 311   /* First treat mask as a list of plain nicks/channels */
 312   if (mask)
 313   {
 314     strcpy(mymask, mask);
 315     for (p = 0, nick = ircd_strtok(&p, mymask, ","); nick;
 316         nick = ircd_strtok(&p, 0, ","))
 317     {
 318       if (IsChannelName(nick) && (chptr = FindChannel(nick)))
 319       {
 320         isthere = (find_channel_member(sptr, chptr) != 0);
 321         if (isthere || SEE_CHANNEL(sptr, chptr, bitsel))
 322         {
 323           struct Membership* member;
 324           for (member = chptr->members; member; member = member->next_member)
 325           {
 326             acptr = member->user;
 327             if ((bitsel & WHOSELECT_OPER) && !SeeOper(sptr,acptr))
 328               continue;
 329             if ((acptr != sptr)
 330                 && ((member->status & CHFL_ZOMBIE)
 331                     || ((member->status & CHFL_DELAYED)
 332                         && !(bitsel & WHOSELECT_DELAY))))
 333               continue;
 334             if (!(isthere || (SEE_USER(sptr, acptr, bitsel))))
 335               continue;
 336             if (!Process(acptr))        /* This can't be moved before other checks */
 337               continue;
 338             if (!(isthere || (SHOW_MORE(sptr, counter))))
 339               break;
 340             do_who(sptr, acptr, chptr, fields, qrt);
 341           }
 342         }
 343       }
 344       else
 345       {
 346         if ((acptr = FindUser(nick)) &&
 347             ((!(bitsel & WHOSELECT_OPER)) || SeeOper(sptr,acptr)) &&
 348             Process(acptr) && SHOW_MORE(sptr, counter))
 349         {
 350           do_who(sptr, acptr, 0, fields, qrt);
 351         }
 352       }
 353     }
 354   }
 355
 356   /* If we didn't have any comma in the mask treat it as a
 357      real mask and try to match all relevant fields */
 358   if (!(commas || (counter < 1)))
 359   {
 360     struct irc_in_addr imask;
 361     int minlen, cset;
 362     unsigned char ibits;
 363
 364     if (mask)
 365     {
 366       matchcomp(mymask, &minlen, &cset, mask);
 367       if (!ipmask_parse(mask, &imask, &ibits))
 368         matchsel &= ~WHO_FIELD_NIP;
 369       if ((minlen > NICKLEN) || !(cset & NTL_IRCNK))
 370         matchsel &= ~WHO_FIELD_NIC;
 371       if ((matchsel & WHO_FIELD_SER) &&
 372           ((minlen > HOSTLEN) || (!(cset & NTL_IRCHN))
 373           || (!markMatchexServer(mymask, minlen))))
 374         matchsel &= ~WHO_FIELD_SER;
 375       if ((minlen > USERLEN) || !(cset & NTL_IRCUI))
 376         matchsel &= ~WHO_FIELD_UID;
 377       if ((minlen > HOSTLEN) || !(cset & NTL_IRCHN))
 378         matchsel &= ~WHO_FIELD_HOS;
 379       if ((minlen > ACCOUNTLEN))
 380         matchsel &= ~WHO_FIELD_ACC;
 381     }
 382
 383     /* First of all loop through the clients in common channels */
 384     if ((!(counter < 1)) && matchsel) {
 385       struct Membership* member;
 386       struct Membership* chan;
 387       for (chan = cli_user(sptr)->channel; chan; chan = chan->next_channel) {
 388         chptr = chan->channel;
 389         for (member = chptr->members; member; member = member->next_member)
 390         {
 391           acptr = member->user;
 392           if (!(IsUser(acptr) && Process(acptr)))
 393             continue;           /* Now Process() is at the beginning, if we fail
 394                                    we'll never have to show this acptr in this query */
 395           if ((bitsel & WHOSELECT_OPER) && !SeeOper(sptr,acptr))
 396             continue;
 397           if ((mask) &&
 398               ((!(matchsel & WHO_FIELD_NIC))
 399               || matchexec(cli_name(acptr), mymask, minlen))
 400               && ((!(matchsel & WHO_FIELD_UID))
 401               || matchexec(cli_user(acptr)->username, mymask, minlen))
 402               && ((!(matchsel & WHO_FIELD_SER))
 403               || (!(HasFlag(cli_user(acptr)->server, FLAG_MAP))))
 404               && ((!(matchsel & WHO_FIELD_HOS))
 405               || matchexec(cli_user(acptr)->host, mymask, minlen))
 406               && ((!(matchsel & WHO_FIELD_HOS))
 407               || !HasHiddenHost(acptr)
 408               || !IsAnOper(sptr)
 409               || matchexec(cli_user(acptr)->realhost, mymask, minlen))
 410               && ((!(matchsel & WHO_FIELD_REN))
 411               || matchexec(cli_info(acptr), mymask, minlen))
 412               && ((!(matchsel & WHO_FIELD_NIP))
 413               || (HasHiddenHost(acptr) && !IsAnOper(sptr))
 414               || !ipmask_check(&cli_ip(acptr), &imask, ibits))
 415               && ((!(matchsel & WHO_FIELD_ACC))
 416               || matchexec(cli_user(acptr)->account, mymask, minlen)))
 417             continue;
 418           if (!SHOW_MORE(sptr, counter))
 419             break;
 420           do_who(sptr, acptr, chptr, fields, qrt);
 421         }
 422       }
 423     }
 424     /* Loop through all clients :-\, if we still have something to match to
 425        and we can show more clients */
 426     if ((!(counter < 1)) && matchsel)
 427       for (acptr = cli_prev(&me); acptr; acptr = cli_prev(acptr))
 428       {
 429         if (!(IsUser(acptr) && Process(acptr)))
 430           continue;
 431         if ((bitsel & WHOSELECT_OPER) && !SeeOper(sptr,acptr))
 432           continue;
 433         if (!(SEE_USER(sptr, acptr, bitsel)))
 434           continue;
 435         if ((mask) &&
 436             ((!(matchsel & WHO_FIELD_NIC))
 437             || matchexec(cli_name(acptr), mymask, minlen))
 438             && ((!(matchsel & WHO_FIELD_UID))
 439             || matchexec(cli_user(acptr)->username, mymask, minlen))
 440             && ((!(matchsel & WHO_FIELD_SER))
 441                 || (!(HasFlag(cli_user(acptr)->server, FLAG_MAP))))
 442             && ((!(matchsel & WHO_FIELD_HOS))
 443             || matchexec(cli_user(acptr)->host, mymask, minlen))
 444             && ((!(matchsel & WHO_FIELD_HOS))
 445             || !HasHiddenHost(acptr)
 446             || !IsAnOper(sptr)
 447             || matchexec(cli_user(acptr)->realhost, mymask, minlen))
 448             && ((!(matchsel & WHO_FIELD_REN))
 449             || matchexec(cli_info(acptr), mymask, minlen))
 450             && ((!(matchsel & WHO_FIELD_NIP))
 451             || (HasHiddenHost(acptr) && !IsAnOper(sptr))
 452             || !ipmask_check(&cli_ip(acptr), &imask, ibits))
 453             && ((!(matchsel & WHO_FIELD_ACC))
 454             || matchexec(cli_user(acptr)->account, mymask, minlen)))
 455           continue;
 456         if (!SHOW_MORE(sptr, counter))
 457           break;
 458         do_who(sptr, acptr, 0, fields, qrt);
 459       }
 460   }
 461
 462   /* Make a clean mask suitable to be sent in the "end of" */
 463   if (mask && (p = strchr(mask, ' ')))
 464     *p = '\0';
 465   send_reply(sptr, RPL_ENDOFWHO, BadPtr(mask) ? "*" : mask);
 466
 467   /* Notify the user if we decided that his query was too long */
 468   if (counter < 0)
 469     send_reply(sptr, ERR_QUERYTOOLONG, "WHO");
 470
 471   return 0;
 472 }