234 lines
8.7 KiB
C
234 lines
8.7 KiB
C
/*
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* IRC - Internet Relay Chat, ircd/m_create.c
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* Copyright (C) 1990 Jarkko Oikarinen and
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* University of Oulu, Computing Center
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*
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* See file AUTHORS in IRC package for additional names of
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* the programmers.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: m_create.c 1744 2007-01-13 18:45:08Z entrope $
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*/
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/*
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* m_functions execute protocol messages on this server:
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*
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* cptr is always NON-NULL, pointing to a *LOCAL* client
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* structure (with an open socket connected!). This
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* identifies the physical socket where the message
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* originated (or which caused the m_function to be
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* executed--some m_functions may call others...).
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*
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* sptr is the source of the message, defined by the
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* prefix part of the message if present. If not
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* or prefix not found, then sptr==cptr.
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*
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* (!IsServer(cptr)) => (cptr == sptr), because
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* prefixes are taken *only* from servers...
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*
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* (IsServer(cptr))
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* (sptr == cptr) => the message didn't
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* have the prefix.
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*
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* (sptr != cptr && IsServer(sptr) means
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* the prefix specified servername. (?)
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*
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* (sptr != cptr && !IsServer(sptr) means
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* that message originated from a remote
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* user (not local).
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*
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* combining
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*
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* (!IsServer(sptr)) means that, sptr can safely
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* taken as defining the target structure of the
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* message in this server.
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*
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* *Always* true (if 'parse' and others are working correct):
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*
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* 1) sptr->from == cptr (note: cptr->from == cptr)
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*
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* 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr
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* *cannot* be a local connection, unless it's
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* actually cptr!). [MyConnect(x) should probably
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* be defined as (x == x->from) --msa ]
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*
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* parc number of variable parameter strings (if zero,
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* parv is allowed to be NULL)
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*
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* parv a NULL terminated list of parameter pointers,
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*
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* parv[0], sender (prefix string), if not present
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* this points to an empty string.
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* parv[1]...parv[parc-1]
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* pointers to additional parameters
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* parv[parc] == NULL, *always*
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*
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* note: it is guaranteed that parv[0]..parv[parc-1] are all
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* non-NULL pointers.
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*/
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#include "config.h"
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#include "channel.h"
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#include "client.h"
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#include "hash.h"
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#include "ircd.h"
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#include "ircd_log.h"
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#include "ircd_reply.h"
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#include "ircd_string.h"
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#include "msg.h"
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#include "numeric.h"
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#include "numnicks.h"
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#include "s_debug.h"
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#include "s_misc.h"
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#include "s_user.h"
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#include "send.h"
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/* #include <assert.h> -- Now using assert in ircd_log.h */
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#include <stdlib.h>
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#include <string.h>
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/*
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* ms_create - server message handler
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*/
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int ms_create(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
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{
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time_t chanTS; /* channel creation time */
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char *p; /* strtok state */
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char *name; /* channel name */
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struct Channel *chptr; /* channel */
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struct JoinBuf join; /* join and create buffers */
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struct JoinBuf create;
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struct ModeBuf mbuf; /* a mode buffer */
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int badop; /* a flag */
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if (IsServer(sptr))
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return protocol_violation(sptr,"%s tried to CREATE a channel", cli_name(sptr));
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/* sanity checks: Only accept CREATE messages from servers */
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if (parc < 3 || *parv[2] == '\0')
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return need_more_params(sptr,"CREATE");
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chanTS = atoi(parv[2]);
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/* A create that didn't appear during a burst has that servers idea of
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* the current time. Use it for lag calculations.
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*/
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if (!IsBurstOrBurstAck(sptr) && 0 != chanTS)
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cli_serv(cli_user(sptr)->server)->lag = TStime() - chanTS;
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/* If this server is >1 minute fast, warn */
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if (TStime() - chanTS<-60)
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{
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static time_t rate;
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sendto_opmask_butone_ratelimited(0, SNO_NETWORK, &rate,
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"Timestamp drift from %C (%is); issuing "
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"SETTIME to correct this",
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cli_user(sptr)->server,
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chanTS - TStime());
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/* Now issue a SETTIME to resync. If we're in the wrong, our
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* (RELIABLE_CLOCK) hub will bounce a SETTIME back to us.
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*/
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sendcmdto_prio_one(&me, CMD_SETTIME, cli_user(sptr)->server,
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"%Tu %C", TStime(), cli_user(sptr)->server);
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}
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joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0);
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joinbuf_init(&create, sptr, cptr, JOINBUF_TYPE_CREATE, 0, chanTS);
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/* For each channel in the comma separated list: */
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for (name = ircd_strtok(&p, parv[1], ","); name;
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name = ircd_strtok(&p, 0, ",")) {
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badop = 0;
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if (IsLocalChannel(name))
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continue;
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if ((chptr = FindChannel(name)))
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{
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/* Is the remote server confused? */
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if (find_member_link(chptr, sptr)) {
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protocol_violation(sptr, "%s tried to CREATE a channel already joined (%s)", cli_name(sptr), chptr->chname);
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continue;
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}
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/* Check if we need to bounce a mode */
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if (TStime() - chanTS > TS_LAG_TIME ||
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(chptr->creationtime && chanTS > chptr->creationtime &&
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/* Accept CREATE for zannels. This is only really necessary on a network
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with servers prior to 2.10.12.02: we just accept their TS and ignore
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the fact that it was a zannel. The influence of this on a network
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that is completely 2.10.12.03 or higher is neglectable: Normally
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a server only sends a CREATE after first sending a DESTRUCT. Thus,
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by receiving a CREATE for a zannel one of three things happened:
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1. The DESTRUCT was sent during a net.break; this could mean that
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our zannel is at the verge of expiring too, it should have been
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destructed. It is correct to copy the newer TS now, all modes
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already have been reset, so it will be as if it was destructed
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and immediately recreated. In order to avoid desyncs of modes,
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we don't accept a CREATE for channels that have +A set.
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2. The DESTRUCT passed, then someone created the channel on our
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side and left it again. In this situation we have a near
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simultaneous creation on two servers; the person on our side
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already left within the time span of a message propagation.
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The channel will therefore be less than 48 hours old and no
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'protection' is necessary.
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3. The source server sent the CREATE while linking,
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before it got the BURST for our zannel. If this
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happens, we should reset the channel back to the old
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timestamp. This can be distinguished from case #1 by
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checking IsBurstOrBurstAck(cli_user(sptr)->server).
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*/
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!(chptr->users == 0 && !chptr->mode.apass[0] && !(chptr->mode.exmode & EXMODE_PERSIST)))) {
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if (!IsBurstOrBurstAck(cli_user(sptr)->server)) {
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modebuf_init(&mbuf, sptr, cptr, chptr,
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(MODEBUF_DEST_SERVER | /* Send mode to server */
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MODEBUF_DEST_HACK2 | /* Send a HACK(2) message */
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MODEBUF_DEST_BOUNCE)); /* And bounce the mode */
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modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, MAXOPLEVEL + 1);
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modebuf_flush(&mbuf);
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badop = 1;
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} else if (chanTS > chptr->creationtime + 4) {
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/* If their handling of the BURST will lead to deopping the
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* user, have the user join without getting ops (if the
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* server's handling of the BURST keeps their ops, the channel
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* will use our timestamp).
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*/
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badop = 1;
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}
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if (badop)
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joinbuf_join(&join, chptr, 0);
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}
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}
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else /* Channel doesn't exist: create it */
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chptr = get_channel(sptr, name, CGT_CREATE);
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if (!badop) {
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/* Set (or correct) our copy of the TS */
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chptr->creationtime = chanTS;
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joinbuf_join(&create, chptr, CHFL_CHANOP);
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}
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}
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joinbuf_flush(&join); /* flush out the joins and creates */
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joinbuf_flush(&create);
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return 0;
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}
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