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/*
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 2002-2018 ircd-hybrid development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
/*! \file m_tburst.c
* \brief Includes required functions for processing the TBURST command.
* \version $Id: m_tburst.c 8436 2018-03-29 09:04:53Z michael $
*/
#include "stdinc.h"
#include "client.h"
#include "ircd.h"
#include "send.h"
#include "modules.h"
#include "hash.h"
#include "server_capab.h"
#include "conf.h"
#include "parse.h"
/*! \brief TBURST command handler
*
* \param source_p Pointer to allocated Client struct from which the message
* originally comes from. This can be a local or remote client.
* \param parc Integer holding the number of supplied arguments.
* \param parv Argument vector where parv[0] .. parv[parc-1] are non-NULL
* pointers.
* \note Valid arguments for this command are:
* - parv[0] = command
* - parv[1] = channel timestamp
* - parv[2] = channel name
* - parv[3] = topic timestamp
* - parv[4] = topic setter
* - parv[5] = topic (can be an empty string)
*/
static int
ms_tburst(struct Client *source_p, int parc, char *parv[])
{
uintmax_t remote_channel_ts = strtoumax(parv[1], NULL, 10);
uintmax_t remote_topic_ts = strtoumax(parv[3], NULL, 10);
const char *topic = parv[5];
const char *setby = parv[4];
/*
* Do NOT test parv[5] for an empty string and return if true!
* parv[5] CAN be an empty string, i.e. if the other side wants
* to unset our topic. Don't forget: an empty topic is also a
* valid topic.
*/
struct Channel *chptr;
if ((chptr = hash_find_channel(parv[2])) == NULL)
return 0;
/*
* The logic for accepting and rejecting channel topics was
* always a bit hairy, so now we got exactly 3 cases where
* we would accept a topic
*
* Case 1:
* A services client/server wants to set a topic
* Case 2:
* The TS of the remote channel is older than ours
* Case 3:
* The TS of the remote channel is equal to ours AND
* the TS of the remote topic is newer than ours
*/
int accept_remote = 0;
if (HasFlag(source_p, FLAGS_SERVICE))
accept_remote = 1;
else if (remote_channel_ts < chptr->creationtime)
accept_remote = 1;
else if (remote_channel_ts == chptr->creationtime)
if (remote_topic_ts > chptr->topic_time)
accept_remote = 1;
if (accept_remote)
{
int topic_differs = strncmp(chptr->topic, topic, sizeof(chptr->topic) - 1);
int hidden_server = (ConfigServerHide.hide_servers || IsHidden(source_p));
channel_set_topic(chptr, topic, setby, remote_topic_ts, 0);
sendto_server(source_p, CAPAB_TBURST, 0, ":%s TBURST %s %s %s %s :%s",
source_p->id, parv[1], parv[2], parv[3], setby, topic);
if (topic_differs)
{
if (!IsClient(source_p))
sendto_channel_local(NULL, chptr, 0, 0, 0, ":%s TOPIC %s :%s",
hidden_server ? me.name : source_p->name,
chptr->name, chptr->topic);
else
sendto_channel_local(NULL, chptr, 0, 0, 0, ":%s!%s@%s TOPIC %s :%s",
source_p->name, source_p->username, source_p->host,
chptr->name, chptr->topic);
}
}
return 0;
}
static struct Message tburst_msgtab =
{
.cmd = "TBURST",
.args_min = 6,
.args_max = MAXPARA,
.handlers[UNREGISTERED_HANDLER] = m_ignore,
.handlers[CLIENT_HANDLER] = m_ignore,
.handlers[SERVER_HANDLER] = ms_tburst,
.handlers[ENCAP_HANDLER] = m_ignore,
.handlers[OPER_HANDLER] = m_ignore
};
static void
module_init(void)
{
mod_add_cmd(&tburst_msgtab);
capab_add("TBURST", CAPAB_TBURST);
}
static void
module_exit(void)
{
mod_del_cmd(&tburst_msgtab);
capab_del("TBURST");
}
struct module module_entry =
{
.version = "$Revision: 8436 $",
.modinit = module_init,
.modexit = module_exit,
};
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