ircd/m_create.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_create.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_create.c,v 1.18 2005/09/27 02:41:57 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_log.h"
  89 #include "ircd_reply.h"
  90 #include "ircd_string.h"
  91 #include "msg.h"
  92 #include "numeric.h"
  93 #include "numnicks.h"
  94 #include "s_debug.h"
  95 #include "s_misc.h"
  96 #include "s_user.h"
  97 #include "send.h"
  98
  99 /* #include <assert.h> -- Now using assert in ircd_log.h */
 100 #include <stdlib.h>
 101 #include <string.h>
 102
 103 /*
 104  * ms_create - server message handler
 105  */
 106 int ms_create(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 107 {
 108   time_t chanTS; /* channel creation time */
 109   char *p; /* strtok state */
 110   char *name; /* channel name */
 111   struct Channel *chptr; /* channel */
 112   struct JoinBuf join; /* join and create buffers */
 113   struct JoinBuf create;
 114   struct ModeBuf mbuf; /* a mode buffer */
 115   int badop; /* a flag */
 116
 117   if (IsServer(sptr))
 118     return protocol_violation(sptr,"%s tried to CREATE a channel", cli_name(sptr));
 119
 120   /* sanity checks: Only accept CREATE messages from servers */
 121   if (parc < 3 || *parv[2] == '\0')
 122     return need_more_params(sptr,"CREATE");
 123
 124   chanTS = atoi(parv[2]);
 125
 126   /* A create that didn't appear during a burst has that servers idea of
 127    * the current time.  Use it for lag calculations.
 128    */
 129   if (!IsBurstOrBurstAck(sptr) && 0 != chanTS &&
 130       MAGIC_REMOTE_JOIN_TS != chanTS)
 131     cli_serv(cli_user(sptr)->server)->lag = TStime() - chanTS;
 132
 133   /* If this server is >1 minute fast, warn */
 134   if (TStime() - chanTS<-60)
 135   {
 136     static time_t rate;
 137     sendto_opmask_butone_ratelimited(0, SNO_NETWORK, &rate,
 138                                      "Timestamp drift from %C (%is); issuing "
 139                                      "SETTIME to correct this",
 140                                      cli_user(sptr)->server,
 141                                      chanTS - TStime());
 142     /* Now issue a SETTIME to resync.  If we're in the wrong, our
 143      * (RELIABLE_CLOCK) hub will bounce a SETTIME back to us.
 144      */
 145     sendcmdto_prio_one(&me, CMD_SETTIME, cli_user(sptr)->server,
 146                        "%Tu %C", TStime(), cli_user(sptr)->server);
 147   }
 148
 149   joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0);
 150   joinbuf_init(&create, sptr, cptr, JOINBUF_TYPE_CREATE, 0, chanTS);
 151
 152   /* For each channel in the comma separated list: */
 153   for (name = ircd_strtok(&p, parv[1], ","); name;
 154        name = ircd_strtok(&p, 0, ",")) {
 155     badop = 0;
 156
 157     if (IsLocalChannel(name))
 158       continue;
 159
 160     if ((chptr = FindChannel(name)))
 161     {
 162       /* Is the remote server confused? */
 163       if (find_member_link(chptr, sptr)) {
 164         protocol_violation(sptr, "%s tried to CREATE a channel already joined", cli_name(sptr));
 165         continue;
 166       }
 167
 168       /* Check if we need to bounce a mode */
 169       if (TStime() - chanTS > TS_LAG_TIME ||
 170           (chptr->creationtime && chanTS > chptr->creationtime &&
 171            chptr->creationtime != MAGIC_REMOTE_JOIN_TS)) {
 172         modebuf_init(&mbuf, sptr, cptr, chptr,
 173                      (MODEBUF_DEST_SERVER |  /* Send mode to server */
 174                       MODEBUF_DEST_HACK2  |  /* Send a HACK(2) message */
 175                       MODEBUF_DEST_BOUNCE)); /* And bounce the mode */
 176
 177         modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, MAXOPLEVEL + 1);
 178
 179         modebuf_flush(&mbuf);
 180
 181         badop = 1;
 182       }
 183     }
 184     else /* Channel doesn't exist: create it */
 185       chptr = get_channel(sptr, name, CGT_CREATE);
 186
 187     if (!badop) /* Set/correct TS */
 188       chptr->creationtime = chanTS;
 189
 190     joinbuf_join(badop ? &join : &create, chptr,
 191                  (badop ? 0 : CHFL_CHANOP));
 192   }
 193
 194   joinbuf_flush(&join); /* flush out the joins and creates */
 195   joinbuf_flush(&create);
 196
 197   return 0;
 198 }