ircd/m_settime.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_settime.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_settime.c,v 1.15 2004/12/11 05:14:03 klmitch 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 "client.h"
  85 #include "hash.h"
  86 #include "ircd.h"
  87 #include "ircd_features.h"
  88 #include "ircd_log.h"
  89 #include "ircd_reply.h"
  90 #include "ircd_snprintf.h"
  91 #include "ircd_string.h"
  92 #include "list.h"
  93 #include "msg.h"
  94 #include "numeric.h"
  95 #include "numnicks.h"
  96 #include "s_user.h"
  97 #include "send.h"
  98 #include "struct.h"
  99
 100 /* #include <assert.h> -- Now using assert in ircd_log.h */
 101 #include <stdlib.h>
 102
 103 /*
 104  * ms_settime - server message handler
 105  *
 106  * parv[0] = sender prefix
 107  * parv[1] = new time
 108  * parv[2] = server name (Only used when sptr is an Oper).
 109  */
 110 int ms_settime(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 111 {
 112   time_t t;
 113   long dt;
 114   static char tbuf[11];
 115   struct DLink *lp;
 116
 117   if (parc < 2) /* verify argument count */
 118     return need_more_params(sptr, "SETTIME");
 119
 120   t = atoi(parv[1]); /* convert time and compute delta */
 121   dt = TStime() - t;
 122
 123   /* verify value */
 124   if (t < OLDEST_TS || dt < -9000000)
 125   {
 126     if (IsServer(sptr)) /* protocol violation if it's from a server */
 127       protocol_violation(sptr, "SETTIME: Bad value (%Tu, delta %ld)", t, dt);
 128     else
 129       sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :SETTIME: Bad value (%Tu, "
 130                     "delta %ld)", sptr, t, dt);
 131       sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :SETTIME: Bad value", sptr);
 132     return 0;
 133   }
 134
 135   /* reset time... */
 136   if (feature_bool(FEAT_RELIABLE_CLOCK))
 137   {
 138     ircd_snprintf(0, tbuf, sizeof(tbuf), "%Tu", TStime());
 139     parv[1] = tbuf;
 140   }
 141
 142   if (BadPtr(parv[2])) /* spam the network */
 143   {
 144     for (lp = cli_serv(&me)->down; lp; lp = lp->next)
 145       if (cptr != lp->value.cptr)
 146         sendcmdto_prio_one(sptr, CMD_SETTIME, lp->value.cptr, "%s", parv[1]);
 147   }
 148   else
 149   {
 150     if (hunt_server_prio_cmd(sptr, CMD_SETTIME, cptr, 1, "%s %C", 2, parc,
 151                              parv) != HUNTED_ISME)
 152     {
 153       /* If the destination was *not* me, but I'm RELIABLE_CLOCK and the
 154        * delta is more than 30 seconds off, bounce back a corrected
 155        * SETTIME
 156        */
 157       if (feature_bool(FEAT_RELIABLE_CLOCK) && (dt > 30 || dt < -30))
 158         sendcmdto_prio_one(&me, CMD_SETTIME, cptr, "%s %C", parv[1], cptr);
 159       return 0;
 160     }
 161   }
 162
 163   if (feature_bool(FEAT_RELIABLE_CLOCK))
 164   {
 165     /* don't apply settime--reliable */
 166     if ((dt > 600) || (dt < -600))
 167       sendcmdto_serv_butone(&me, CMD_DESYNCH, 0, ":Bad SETTIME from %s: %Tu "
 168                             "(delta %ld)", cli_name(sptr), t, dt);
 169     /* Let user know we're ignoring him */
 170     if (IsUser(sptr))
 171     {
 172       sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :clock is not set %ld "
 173                     "seconds %s : RELIABLE_CLOCK is defined", sptr,
 174                     (dt < 0) ? -dt : dt, (dt < 0) ? "forwards" : "backwards");
 175     }
 176   }
 177   else /* tell opers about time change */
 178   {
 179     sendto_opmask_butone(0, SNO_OLDSNO, "SETTIME from %s, clock is set %ld "
 180                          "seconds %s", cli_name(sptr), (dt < 0) ? -dt : dt,
 181                          (dt < 0) ? "forwards" : "backwards");
 182     /* Apply time change... */
 183     TSoffset -= dt;
 184     /* Let the issuing user know what we did... */
 185     if (IsUser(sptr))
 186     {
 187       sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :clock is set %ld seconds %s",
 188                     sptr, (dt < 0) ? -dt : dt,
 189                     (dt < 0) ? "forwards" : "backwards");
 190     }
 191   }
 192
 193   return 0;
 194 }
 195
 196 /*
 197  * mo_settime - oper message handler
 198  *
 199  * parv[0] = sender prefix
 200  * parv[1] = new time
 201  * parv[2] = servername (Only used when sptr is an Oper).
 202  */
 203 int mo_settime(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 204 {
 205   time_t t;
 206   long dt;
 207   static char tbuf[11];
 208
 209   /* Must be a global oper */
 210   if (!IsOper(sptr))
 211     return send_reply(sptr, ERR_NOPRIVILEGES);
 212
 213   if (parc < 2) /* verify argument count */
 214     return need_more_params(sptr, "SETTIME");
 215
 216   if (parc == 2 && MyUser(sptr)) /* default to me */
 217     parv[parc++] = cli_name(&me);
 218
 219   t = atoi(parv[1]); /* convert the time */
 220
 221   /* If we're reliable_clock or if the oper specified a 0 time, use current */
 222   if (!t || feature_bool(FEAT_RELIABLE_CLOCK))
 223   {
 224     t = TStime();
 225     ircd_snprintf(0, tbuf, sizeof(tbuf), "%Tu", TStime());
 226     parv[1] = tbuf;
 227   }
 228
 229   dt = TStime() - t; /* calculate the delta */
 230
 231   if (t < OLDEST_TS || dt < -9000000) /* verify value */
 232   {
 233     sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :SETTIME: Bad value", sptr);
 234     return 0;
 235   }
 236
 237   /* OK, send the message off to its destination */
 238   if (hunt_server_prio_cmd(sptr, CMD_SETTIME, cptr, 1, "%s %C", 2, parc,
 239                            parv) != HUNTED_ISME)
 240     return 0;
 241
 242   if (feature_bool(FEAT_RELIABLE_CLOCK)) /* don't apply settime--reliable */
 243   {
 244     if ((dt > 600) || (dt < -600))
 245       sendcmdto_serv_butone(&me, CMD_DESYNCH, 0, ":Bad SETTIME from %s: %Tu "
 246                             "(delta %ld)", cli_name(sptr), t, dt);
 247     if (IsUser(sptr)) /* Let user know we're ignoring him */
 248       sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :clock is not set %ld seconds "
 249                     "%s: RELIABLE_CLOCK is defined", sptr, (dt < 0) ? -dt : dt,
 250                     (dt < 0) ? "forwards" : "backwards");
 251   }
 252   else /* tell opers about time change */
 253   {
 254     sendto_opmask_butone(0, SNO_OLDSNO, "SETTIME from %s, clock is set %ld "
 255                          "seconds %s", cli_name(sptr), (dt < 0) ? -dt : dt,
 256                          (dt < 0) ? "forwards" : "backwards");
 257     TSoffset -= dt; /* apply time change */
 258     if (IsUser(sptr)) /* let user know what we did */
 259       sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :clock is set %ld seconds %s",
 260                     sptr, (dt < 0) ? -dt : dt,
 261                     (dt < 0) ? "forwards" : "backwards");
 262   }
 263
 264   return 0;
 265 }