modules/m_svinfo.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_svinfo.c: Sends TS information for clock & compatibility checks.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   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 2 of the License, or
  12  *  (at your option) 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  */
  24 #include "stdinc.h"
  25 #include "client.h"
  26 #include "common.h"             /* TRUE bleah */
  27 #include "irc_string.h"
  28 #include "ircd.h"
  29 #include "numeric.h"
  30 #include "send.h"
  31 #include "s_conf.h"
  32 #include "s_log.h"
  33 #include "msg.h"
  34 #include "parse.h"
  35 #include "modules.h"
  36
  37 static int ms_svinfo(struct Client *, struct Client *, int, const char **);
  38
  39 struct Message svinfo_msgtab = {
  40         "SVINFO", 0, 0, 0, MFLG_SLOW,
  41         {mg_unreg, mg_ignore, mg_ignore, {ms_svinfo, 5}, mg_ignore, mg_ignore}
  42 };
  43
  44 mapi_clist_av1 svinfo_clist[] = { &svinfo_msgtab, NULL };
  45 DECLARE_MODULE_AV1(svinfo, NULL, NULL, svinfo_clist, NULL, NULL, "$Revision: 108 $");
  46
  47 /*
  48  * ms_svinfo - SVINFO message handler
  49  *      parv[0] = sender prefix
  50  *      parv[1] = TS_CURRENT for the server
  51  *      parv[2] = TS_MIN for the server
  52  *      parv[3] = unused, send 0
  53  *      parv[4] = server's idea of UTC time
  54  */
  55 static int
  56 ms_svinfo(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  57 {
  58         signed int deltat;
  59         time_t theirtime;
  60
  61         /* SVINFO isnt remote. */
  62         if(source_p != client_p)
  63                 return 0;
  64
  65         if(TS_CURRENT < atoi(parv[2]) || atoi(parv[1]) < TS_MIN)
  66         {
  67                 /* TS version is too low on one of the sides, drop the link */
  68                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
  69                                      "Link %s dropped, wrong TS protocol version (%s,%s)",
  70                                      get_server_name(source_p, SHOW_IP), parv[1], parv[2]);
  71                 exit_client(source_p, source_p, source_p, "Incompatible TS version");
  72                 return 0;
  73         }
  74
  75         /*
  76          * since we're here, might as well set CurrentTime while we're at it
  77          */
  78         set_time();
  79         theirtime = atol(parv[4]);
  80         deltat = abs(theirtime - CurrentTime);
  81
  82         if(deltat > ConfigFileEntry.ts_max_delta)
  83         {
  84                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
  85                                      "Link %s dropped, excessive TS delta"
  86                                      " (my TS=%ld, their TS=%ld, delta=%d)",
  87                                      get_server_name(source_p, SHOW_IP),
  88                                      (long) CurrentTime, (long) theirtime, deltat);
  89                 ilog(L_SERVER,
  90                      "Link %s dropped, excessive TS delta"
  91                      " (my TS=%ld, their TS=%ld, delta=%d)",
  92                      log_client_name(source_p, SHOW_IP), (long) CurrentTime, (long) theirtime, deltat);
  93                 exit_client(source_p, source_p, source_p, "Excessive TS delta");
  94                 return 0;
  95         }
  96
  97         if(deltat > ConfigFileEntry.ts_warn_delta)
  98         {
  99                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 100                                      "Link %s notable TS delta"
 101                                      " (my TS=%ld, their TS=%ld, delta=%d)",
 102                                      source_p->name, (long) CurrentTime, (long) theirtime, deltat);
 103         }
 104
 105         return 0;
 106 }
 107