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 "match.h"
  27 #include "ircd.h"
  28 #include "numeric.h"
  29 #include "send.h"
  30 #include "s_conf.h"
  31 #include "s_newconf.h"
  32 #include "logger.h"
  33 #include "msg.h"
  34 #include "parse.h"
  35 #include "modules.h"
  36
  37 static const char svinfo_desc[] =
  38         "Provides TS6 SVINFO command to ensure version and clock synchronisation";
  39
  40 static void ms_svinfo(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  41 struct Message svinfo_msgtab = {
  42         "SVINFO", 0, 0, 0, 0,
  43         {mg_unreg, mg_ignore, mg_ignore, {ms_svinfo, 5}, mg_ignore, mg_ignore}
  44 };
  45
  46 mapi_clist_av1 svinfo_clist[] = { &svinfo_msgtab, NULL };
  47 DECLARE_MODULE_AV2(svinfo, NULL, NULL, svinfo_clist, NULL, NULL, NULL, NULL, svinfo_desc);
  48
  49 /*
  50  * ms_svinfo - SVINFO message handler
  51  *      parv[1] = TS_CURRENT for the server
  52  *      parv[2] = TS_MIN for the server
  53  *      parv[3] = unused, send 0
  54  *      parv[4] = server's idea of UTC time
  55  */
  56 static void
  57 ms_svinfo(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  58 {
  59         signed long deltat;
  60         time_t theirtime;
  61         char squitreason[120];
  62
  63         /* SVINFO isnt remote. */
  64         if(source_p != client_p)
  65                 return;
  66
  67         if(TS_CURRENT < atoi(parv[2]) || atoi(parv[1]) < TS_MIN)
  68         {
  69                 /* TS version is too low on one of the sides, drop the link */
  70                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
  71                                      "Link %s dropped, wrong TS protocol version (%s,%s)",
  72                                      source_p->name, parv[1], parv[2]);
  73                 snprintf(squitreason, sizeof squitreason, "Incompatible TS version (%s,%s)",
  74                                 parv[1], parv[2]);
  75                 exit_client(source_p, source_p, source_p, squitreason);
  76                 return;
  77         }
  78
  79         /*
  80          * since we're here, might as well set rb_current_time() while we're at it
  81          */
  82         rb_set_time();
  83         theirtime = atol(parv[4]);
  84         deltat = labs(theirtime - rb_current_time());
  85
  86         if(deltat > ConfigFileEntry.ts_max_delta)
  87         {
  88                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
  89                                      "Link %s dropped, excessive TS delta"
  90                                      " (my TS=%ld, their TS=%ld, delta=%ld)",
  91                                      source_p->name,
  92                                      (long) rb_current_time(), (long) theirtime, deltat);
  93                 ilog(L_SERVER,
  94                      "Link %s dropped, excessive TS delta"
  95                      " (my TS=%ld, their TS=%ld, delta=%ld)",
  96                      log_client_name(source_p, SHOW_IP), (long) rb_current_time(), (long) theirtime, deltat);
  97                 snprintf(squitreason, sizeof squitreason, "Excessive TS delta (my TS=%ld, their TS=%ld, delta=%ld)",
  98                                 (long) rb_current_time(), (long) theirtime, deltat);
  99                 disable_server_conf_autoconn(source_p->name);
 100                 exit_client(source_p, source_p, source_p, squitreason);
 101                 return;
 102         }
 103
 104         if(deltat > ConfigFileEntry.ts_warn_delta)
 105         {
 106                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 107                                      "Link %s notable TS delta"
 108                                      " (my TS=%ld, their TS=%ld, delta=%ld)",
 109                                      source_p->name, (long) rb_current_time(), (long) theirtime, deltat);
 110         }
 111 }