ircd/m_trace.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_trace.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_trace.c,v 1.13 2005/08/26 03:23:23 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 "class.h"
  85 #include "client.h"
  86 #include "hash.h"
  87 #include "ircd.h"
  88 #include "ircd_features.h"
  89 #include "ircd_log.h"
  90 #include "ircd_reply.h"
  91 #include "ircd_string.h"
  92 #include "match.h"
  93 #include "msg.h"
  94 #include "numeric.h"
  95 #include "numnicks.h"
  96 #include "s_bsd.h"
  97 #include "s_conf.h"
  98 #include "s_user.h"
  99 #include "send.h"
 100 #include "version.h"
 101
 102 /* #include <assert.h> -- Now using assert in ircd_log.h */
 103 #include <string.h>
 104
 105 void do_trace(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
 106 {
 107   int i;
 108   struct Client *acptr;
 109   struct Client *acptr2;
 110   const struct ConnectionClass* cl;
 111   char* tname;
 112   int doall;
 113   int link_s[MAXCONNECTIONS];
 114   int link_u[MAXCONNECTIONS];
 115   int cnt = 0;
 116   int wilds;
 117   int dow;
 118
 119   if (parc < 2 || BadPtr(parv[1]))
 120   {
 121     /* just "TRACE" without parameters. Must be from local client */
 122     parc = 1;
 123     acptr = &me;
 124     tname = cli_name(&me);
 125     i = HUNTED_ISME;
 126   }
 127   else if (parc < 3 || BadPtr(parv[2]))
 128   {
 129     /* No target specified. Make one before propagating. */
 130     parc = 2;
 131     tname = parv[1];
 132     if ((acptr = find_match_server(parv[1])) ||
 133         ((acptr = FindClient(parv[1])) && !MyUser(acptr)))
 134     {
 135       if (IsUser(acptr))
 136         parv[2] = cli_name(cli_user(acptr)->server);
 137       else
 138         parv[2] = cli_name(acptr);
 139       parc = 3;
 140       parv[3] = 0;
 141       if ((i = hunt_server_cmd(sptr, CMD_TRACE, cptr, IsServer(acptr),
 142                                "%s :%C", 2, parc, parv)) == HUNTED_NOSUCH)
 143         return;
 144     }
 145     else
 146       i = HUNTED_ISME;
 147   } else {
 148     /* Got "TRACE <tname> :<target>" */
 149     parc = 3;
 150     if (MyUser(sptr) || Protocol(cptr) < 10)
 151       acptr = find_match_server(parv[2]);
 152     else
 153       acptr = FindNServer(parv[2]);
 154     if ((i = hunt_server_cmd(sptr, CMD_TRACE, cptr, 0, "%s :%C", 2, parc,
 155                              parv)) == HUNTED_NOSUCH)
 156       return;
 157     tname = parv[1];
 158   }
 159
 160   if (i == HUNTED_PASS) {
 161     if (!acptr)
 162       acptr = next_client(GlobalClientList, tname);
 163     else
 164       acptr = cli_from(acptr);
 165     send_reply(sptr, RPL_TRACELINK,
 166                version, debugmode, tname,
 167                acptr ? cli_name(cli_from(acptr)) : "<No_match>");
 168     return;
 169   }
 170
 171   doall = (parv[1] && (parc > 1)) ? !match(tname, cli_name(&me)) : 1;
 172   wilds = !parv[1] || strchr(tname, '*') || strchr(tname, '?');
 173   dow = wilds || doall;
 174
 175   /* Don't give (long) remote listings to lusers */
 176   if (dow && !MyConnect(sptr) && !IsAnOper(sptr)) {
 177     send_reply(sptr, RPL_TRACEEND);
 178     return;
 179   }
 180
 181   for (i = 0; i < MAXCONNECTIONS; i++)
 182     link_s[i] = 0, link_u[i] = 0;
 183
 184   if (doall) {
 185     for (acptr = GlobalClientList; acptr; acptr = cli_next(acptr)) {
 186       if (IsUser(acptr))
 187         link_u[cli_fd(cli_from(acptr))]++;
 188       else if (IsServer(acptr))
 189         link_s[cli_fd(cli_from(acptr))]++;
 190     }
 191   }
 192
 193   /* report all direct connections */
 194
 195   for (i = 0; i <= HighestFd; i++) {
 196     const char *conClass;
 197
 198     if (!(acptr = LocalClientArray[i])) /* Local Connection? */
 199       continue;
 200     if (IsInvisible(acptr) && dow && !(MyConnect(sptr) && IsOper(sptr)) &&
 201         !IsAnOper(acptr) && (acptr != sptr))
 202       continue;
 203     if (!doall && wilds && match(tname, cli_name(acptr)))
 204       continue;
 205     if (!dow && 0 != ircd_strcmp(tname, cli_name(acptr)))
 206       continue;
 207
 208     conClass = get_client_class(acptr);
 209
 210     switch (cli_status(acptr)) {
 211       case STAT_CONNECTING:
 212         send_reply(sptr, RPL_TRACECONNECTING, conClass, cli_name(acptr));
 213         cnt++;
 214         break;
 215       case STAT_HANDSHAKE:
 216         send_reply(sptr, RPL_TRACEHANDSHAKE, conClass, cli_name(acptr));
 217         cnt++;
 218         break;
 219       case STAT_ME:
 220         break;
 221       case STAT_UNKNOWN:
 222       case STAT_UNKNOWN_USER:
 223         send_reply(sptr, RPL_TRACEUNKNOWN, conClass,
 224                    get_client_name(acptr, HIDE_IP));
 225         cnt++;
 226         break;
 227       case STAT_UNKNOWN_SERVER:
 228         send_reply(sptr, RPL_TRACEUNKNOWN, conClass, "Unknown Server");
 229         cnt++;
 230         break;
 231       case STAT_USER:
 232         /* Only opers see users if there is a wildcard
 233            but anyone can see all the opers. */
 234         if ((IsAnOper(sptr) && (MyUser(sptr) ||
 235             !(dow && IsInvisible(acptr)))) || !dow || IsAnOper(acptr)) {
 236           if (IsAnOper(acptr))
 237             send_reply(sptr, RPL_TRACEOPERATOR, conClass,
 238                        get_client_name(acptr, SHOW_IP),
 239                        CurrentTime - cli_lasttime(acptr));
 240           else
 241             send_reply(sptr, RPL_TRACEUSER, conClass,
 242                        get_client_name(acptr, SHOW_IP),
 243                        CurrentTime - cli_lasttime(acptr));
 244           cnt++;
 245         }
 246         break;
 247         /*
 248          * Connection is a server
 249          *
 250          * Serv <class> <nS> <nC> <name> <ConnBy> <last> <age>
 251          *
 252          * class        Class the server is in
 253          * nS           Number of servers reached via this link
 254          * nC           Number of clients reached via this link
 255          * name         Name of the server linked
 256          * ConnBy       Who established this link
 257          * last         Seconds since we got something from this link
 258          * age          Seconds this link has been alive
 259          *
 260          * Additional comments etc......        -Cym-<cym@acrux.net>
 261          */
 262
 263       case STAT_SERVER:
 264         if (cli_serv(acptr)->user) {
 265           if (!cli_serv(acptr)->by[0]
 266               || !(acptr2 = findNUser(cli_serv(acptr)->by))
 267               || (cli_user(acptr2) != cli_serv(acptr)->user))
 268             acptr2 = NULL;
 269           send_reply(sptr, RPL_TRACESERVER, conClass, link_s[i],
 270                      link_u[i], cli_name(acptr),
 271                      acptr2 ? cli_name(acptr2) : "*",
 272                      cli_serv(acptr)->user->username,
 273                      cli_serv(acptr)->user->host,
 274                      CurrentTime - cli_lasttime(acptr),
 275                      CurrentTime - cli_serv(acptr)->timestamp);
 276         } else
 277           send_reply(sptr, RPL_TRACESERVER, conClass, link_s[i],
 278                      link_u[i], cli_name(acptr),
 279                      (*(cli_serv(acptr))->by) ?  cli_serv(acptr)->by : "*", "*",
 280                      cli_name(&me), CurrentTime - cli_lasttime(acptr),
 281                      CurrentTime - cli_serv(acptr)->timestamp);
 282         cnt++;
 283         break;
 284       default:                  /* We actually shouldn't come here, -msa */
 285         send_reply(sptr, RPL_TRACENEWTYPE, get_client_name(acptr, HIDE_IP));
 286         cnt++;
 287         break;
 288     }
 289   }
 290   /*
 291    * Add these lines to summarize the above which can get rather long
 292    * and messy when done remotely - Avalon
 293    */
 294   if (IsAnOper(sptr) && doall) {
 295     for (cl = get_class_list(); cl; cl = cl->next) {
 296       if (Links(cl) > 1)
 297        send_reply(sptr, RPL_TRACECLASS, ConClass(cl), Links(cl) - 1);
 298     }
 299   }
 300   send_reply(sptr, RPL_TRACEEND);
 301 }
 302
 303 /*
 304  * m_trace - generic message handler
 305  *
 306  * parv[0] = sender prefix
 307  * parv[1] = nick or servername
 308  * parv[2] = 'target' servername
 309  */
 310 int m_trace(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 311 {
 312   if (feature_bool(FEAT_HIS_TRACE))
 313     return send_reply(cptr, ERR_NOPRIVILEGES);
 314   do_trace(cptr, sptr, parc, parv);
 315   return 0;
 316 }
 317
 318 /*
 319  * ms_trace - server message handler
 320  *
 321  * parv[0] = sender prefix
 322  * parv[1] = nick or servername
 323  * parv[2] = 'target' servername
 324  */
 325 int ms_trace(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 326 {
 327   do_trace(cptr, sptr, parc, parv);
 328   return 0;
 329 }
 330
 331 /*
 332  * mo_trace - oper message handler
 333  *
 334  * parv[0] = sender prefix
 335  * parv[1] = nick or servername
 336  * parv[2] = 'target' servername
 337  */
 338 int mo_trace(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 339 {
 340   if (feature_bool(FEAT_HIS_TRACE) && !IsAnOper(sptr))
 341     return send_reply(cptr, ERR_NOPRIVILEGES);
 342   do_trace(cptr, sptr, parc, parv);
 343   return 0;
 344 }