trunk/modules/m_tburst.c

/*  modules/m_tburst.c
 *  Copyright (C) 2002, 2003, 2004, 2005 Hybrid Development Team
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *  1.Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  2.Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  3.The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 *  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 *  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 *
 *  $Id$
 */

#include "stdinc.h"
#include "client.h"
#include "ircd.h"
#include "send.h"
#include "modules.h"
#include "hash.h"
#include "s_serv.h"
#include "conf.h"
#include "parse.h"


/* ms_tburst()
 *
 *      parv[0] = sender prefix
 *      parv[1] = channel timestamp
 *      parv[2] = channel
 *      parv[3] = topic timestamp
 *      parv[4] = topic setter
 *      parv[5] = topic
 */
static void
ms_tburst(struct Client *client_p, struct Client *source_p,
          int parc, char *parv[])
{
  struct Channel *chptr = NULL;
  int accept_remote = 0;
  time_t remote_channel_ts = atol(parv[1]);
  time_t remote_topic_ts = atol(parv[3]);
  const char *topic = "";
  const char *setby = "";

  /*
   * 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.
   */


  if ((chptr = hash_find_channel(parv[2])) == NULL)
    return;

  if (parc == 6)
  {
    topic = parv[5];
    setby = parv[4];
  }

  /*
   * The logic for accepting and rejecting channel topics was
   * always a bit hairy, so now we got exactly 2 cases where
   * we would accept a bursted topic
   *
   * Case 1:
   *        The TS of the remote channel is older than ours
   * Case 2:
   *        The TS of the remote channel is equal to ours AND
   *        the TS of the remote topic is newer than ours
   */
  if (HasFlag(source_p, FLAGS_SERVICE))
    accept_remote = 1;
  else if (remote_channel_ts < chptr->channelts)
    accept_remote = 1;
  else if (remote_channel_ts == chptr->channelts)
    if (remote_topic_ts > chptr->topic_time)
      accept_remote = 1;

  if (accept_remote)
  {
    set_channel_topic(chptr, topic, setby, remote_topic_ts);

    if (strncmp(chptr->topic, topic, sizeof(chptr->topic) - 1))
      sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s TOPIC %s :%s",
                           ConfigServerHide.hide_servers ? me.name : source_p->name,
                           chptr->chname, chptr->topic);
  }

  /*
   * Always propagate what we have received, not only if we accept the topic.
   * This will keep other servers in sync.
   */
  sendto_server(source_p, CAP_TBURST|CAP_TS6, NOCAPS,
                ":%s TBURST %s %s %s %s :%s",
                ID(source_p), parv[1], parv[2], parv[3], setby, topic);
  sendto_server(source_p, CAP_TBURST, CAP_TS6,
                ":%s TBURST %s %s %s %s :%s",
                source_p->name, parv[1], parv[2], parv[3], setby, topic);
}

static struct Message tburst_msgtab = {
  "TBURST", 0, 0, 5, MAXPARA, MFLG_SLOW, 0,
  { m_ignore, m_ignore, ms_tburst, m_ignore, m_ignore, m_ignore }
};

static void
module_init(void)
{
  mod_add_cmd(&tburst_msgtab);
  add_capability("TBURST", CAP_TBURST, 1);
}

static void
module_exit(void)
{
  mod_del_cmd(&tburst_msgtab);
  delete_capability("TBURST");
}

struct module module_entry = {
  .node    = { NULL, NULL, NULL },
  .name    = NULL,
  .version = "$Revision$",
  .handle  = NULL,
  .modinit = module_init,
  .modexit = module_exit,
  .flags   = 0
};
Revision:	1485
Committed:	Fri Jul 27 08:15:55 2012 UTC (14 years, 2 months ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-8/modules/m_tburst.c*
File size:	4611 byte(s)
Log Message:	- m_tburst.c: Services may always override topic-/channel-TS rules
#	User	Rev	Content
1	michael	325	/* modules/m_tburst.c
2			* Copyright (C) 2002, 2003, 2004, 2005 Hybrid Development Team
3			*
4			* Redistribution and use in source and binary forms, with or without
5			* modification, are permitted provided that the following conditions are
6			* met:
7			*
8			* 1.Redistributions of source code must retain the above copyright notice,
9			* this list of conditions and the following disclaimer.
10			* 2.Redistributions in binary form must reproduce the above copyright
11			* notice, this list of conditions and the following disclaimer in the
12			* documentation and/or other materials provided with the distribution.
13			* 3.The name of the author may not be used to endorse or promote products
14			* derived from this software without specific prior written permission.
15			*
16			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18			* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19			* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20			* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21			* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22			* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25			* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26			* POSSIBILITY OF SUCH DAMAGE.
27			*
28	michael	335	* $Id$
29	michael	325	*/
30
31			#include "stdinc.h"
32			#include "client.h"
33			#include "ircd.h"
34			#include "send.h"
35			#include "modules.h"
36			#include "hash.h"
37			#include "s_serv.h"
38	michael	1309	#include "conf.h"
39	michael	1243	#include "parse.h"
40	michael	325
41
42			/* ms_tburst()
43			*
44			* parv[0] = sender prefix
45			* parv[1] = channel timestamp
46			* parv[2] = channel
47			* parv[3] = topic timestamp
48			* parv[4] = topic setter
49			* parv[5] = topic
50			*/
51			static void
52			ms_tburst(struct Client client_p, struct Client source_p,
53			int parc, char *parv[])
54			{
55			struct Channel *chptr = NULL;
56	michael	336	int accept_remote = 0;
57			time_t remote_channel_ts = atol(parv[1]);
58			time_t remote_topic_ts = atol(parv[3]);
59	michael	394	const char *topic = "";
60			const char *setby = "";
61	michael	325
62	michael	336	/*
63			* Do NOT test parv[5] for an empty string and return if true!
64			* parv[5] CAN be an empty string, i.e. if the other side wants
65			* to unset our topic. Don't forget: an empty topic is also a
66			* valid topic.
67			*/
68
69
70	michael	325	if ((chptr = hash_find_channel(parv[2])) == NULL)
71			return;
72
73	michael	394	if (parc == 6)
74			{
75			topic = parv[5];
76			setby = parv[4];
77			}
78
79	michael	336	/*
80			* The logic for accepting and rejecting channel topics was
81			* always a bit hairy, so now we got exactly 2 cases where
82			* we would accept a bursted topic
83			*
84			* Case 1:
85			* The TS of the remote channel is older than ours
86			* Case 2:
87			* The TS of the remote channel is equal to ours AND
88			* the TS of the remote topic is newer than ours
89	michael	325	*/
90	michael	1485	if (HasFlag(source_p, FLAGS_SERVICE))
91	michael	336	accept_remote = 1;
92	michael	1485	else if (remote_channel_ts < chptr->channelts)
93			accept_remote = 1;
94	michael	336	else if (remote_channel_ts == chptr->channelts)
95			if (remote_topic_ts > chptr->topic_time)
96			accept_remote = 1;
97
98			if (accept_remote)
99			{
100	michael	394	set_channel_topic(chptr, topic, setby, remote_topic_ts);
101	michael	336
102	michael	1485	if (strncmp(chptr->topic, topic, sizeof(chptr->topic) - 1))
103	michael	1243	sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s TOPIC %s :%s",
104	michael	336	ConfigServerHide.hide_servers ? me.name : source_p->name,
105	michael	1203	chptr->chname, chptr->topic);
106	michael	336	}
107
108			/*
109			* Always propagate what we have received, not only if we accept the topic.
110			* This will keep other servers in sync.
111			*/
112	michael	1474	sendto_server(source_p, CAP_TBURST\|CAP_TS6, NOCAPS,
113	michael	336	":%s TBURST %s %s %s %s :%s",
114	michael	1472	ID(source_p), parv[1], parv[2], parv[3], setby, topic);
115	michael	1474	sendto_server(source_p, CAP_TBURST, CAP_TS6,
116	michael	1472	":%s TBURST %s %s %s %s :%s",
117	michael	394	source_p->name, parv[1], parv[2], parv[3], setby, topic);
118	michael	325	}
119
120	michael	1230	static struct Message tburst_msgtab = {
121			"TBURST", 0, 0, 5, MAXPARA, MFLG_SLOW, 0,
122			{ m_ignore, m_ignore, ms_tburst, m_ignore, m_ignore, m_ignore }
123			};
124
125	michael	325	static void
126	michael	1230	module_init(void)
127	michael	325	{
128	michael	1230	mod_add_cmd(&tburst_msgtab);
129			add_capability("TBURST", CAP_TBURST, 1);
130			}
131	michael	325
132	michael	1230	static void
133			module_exit(void)
134			{
135			mod_del_cmd(&tburst_msgtab);
136			delete_capability("TBURST");
137	michael	325	}
138	michael	1230
139			struct module module_entry = {
140			.node = { NULL, NULL, NULL },
141			.name = NULL,
142			.version = "$Revision$",
143			.handle = NULL,
144			.modinit = module_init,
145			.modexit = module_exit,
146			.flags = 0
147			};