8.1.0beta1/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 "handlers.h"
#include "client.h"
#include "common.h"
#include "ircd.h"
#include "send.h"
#include "msg.h"
#include "modules.h"
#include "hash.h"
#include "s_serv.h"
#include "s_conf.h"

static void ms_tb(struct Client *, struct Client *, int, char *[]);
static void ms_tburst(struct Client *, struct Client *, int, char *[]);
static void set_topic(struct Client *, struct Channel *, time_t,
                      const char *, const char *);

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

struct Message tb_msgtab = {
  "TB", 0, 0, 4, MAXPARA, MFLG_SLOW, 0,
  { m_ignore, m_ignore, ms_tb, m_ignore, m_ignore, m_ignore }
};

void
_modinit(void)
{
  mod_add_cmd(&tb_msgtab);
  add_capability("TB", CAP_TB, 1);

  mod_add_cmd(&tburst_msgtab);
  add_capability("TBURST", CAP_TBURST, 1);
}

void
_moddeinit(void)
{
  mod_del_cmd(&tb_msgtab);
  delete_capability("TB");

  mod_del_cmd(&tburst_msgtab);
  delete_capability("TBURST");
}

const char *_version = "$Revision$";

/* 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 (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)
  {
    int topic_differs = strcmp(chptr->topic, topic);

    set_channel_topic(chptr, topic, setby, remote_topic_ts);

    if (topic_differs)
      sendto_channel_local(ALL_MEMBERS, NO, 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, chptr, CAP_TBURST, NOCAPS,
                ":%s TBURST %s %s %s %s :%s",
                source_p->name, parv[1], parv[2], parv[3], setby, topic);
  if (parc > 5 && *topic != '\0') /* unsetting a topic is not supported by TB */
    sendto_server(source_p, chptr, CAP_TB, CAP_TBURST,
                  ":%s TB %s %s %s :%s",
                  source_p->name, parv[1], parv[2], setby, topic);
}

/* ms_tb()
 * 
 *      parv[0] = sender prefix
 *      parv[1] = channel name
 *      parv[2] = topic timestamp
 *      parv[3] = topic setter OR topic itself if parc == 4
 *      parv[4] = topic itself if parc == 5
 */
#define tb_channel      parv[1]
#define tb_topicts_str  parv[2]

static void
ms_tb(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
  struct Channel *chptr;
  time_t tb_topicts = atol(tb_topicts_str);
  char *tb_whoset = NULL;
  char *tb_topic = NULL;

  if ((chptr = hash_find_channel(tb_channel)) == NULL)
    return;

  if (parc == 5)
  {
    tb_whoset = parv[3];
    tb_topic = parv[4];
  }
  else
  {
    tb_whoset = source_p->name;
    tb_topic = parv[3];
  }

  set_topic(source_p, chptr, tb_topicts, tb_whoset, tb_topic);
}

/*
 * set_topic
 *
 * inputs       - source_p pointer
 *              - channel pointer
 *              - topicts to set
 *              - who to set as who doing the topic
 *              - topic
 * output       - none
 * Side effects - simply propagates topic as needed
 * little helper function, could be removed
 */
static void
set_topic(struct Client *source_p, struct Channel *chptr, time_t topicts,
          const char *topicwho, const char *topic)
{
  int new_topic = strcmp(chptr->topic, topic);

  set_channel_topic(chptr, topic, topicwho, topicts);

  /* Only send TOPIC to channel if it's different */
  if (new_topic)
    sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :%s",
                         ConfigServerHide.hide_servers ? me.name : source_p->name,
                         chptr->chname, chptr->topic);

  sendto_server(source_p, chptr, CAP_TBURST, NOCAPS,
                ":%s TBURST %lu %s %lu %s :%s",
                me.name, (unsigned long)chptr->channelts, chptr->chname,
                (unsigned long)chptr->topic_time,
                chptr->topic_info,
                chptr->topic);
  sendto_server(source_p, chptr, CAP_TB, CAP_TBURST,
                ":%s TB %s %lu %s :%s",
                me.name, chptr->chname,
                (unsigned long)chptr->topic_time, 
                chptr->topic_info,
                chptr->topic);
}
Revision:	1203
Committed:	Tue Aug 23 20:06:08 2011 UTC (14 years ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-8/modules/m_tburst.c*
File size:	7100 byte(s)
Log Message:	- make channel::topic and channel::topic_info fixed-size arrays
#	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 "handlers.h"
33			#include "client.h"
34			#include "common.h"
35			#include "ircd.h"
36			#include "send.h"
37			#include "msg.h"
38			#include "modules.h"
39			#include "hash.h"
40			#include "s_serv.h"
41			#include "s_conf.h"
42
43			static void ms_tb(struct Client , struct Client , int, char *[]);
44			static void ms_tburst(struct Client , struct Client , int, char *[]);
45	michael	335	static void set_topic(struct Client , struct Channel , time_t,
46			const char , const char );
47	michael	325
48			struct Message tburst_msgtab = {
49	michael	1178	"TBURST", 0, 0, 5, MAXPARA, MFLG_SLOW, 0,
50	michael	335	{ m_ignore, m_ignore, ms_tburst, m_ignore, m_ignore, m_ignore }
51	michael	325	};
52
53			struct Message tb_msgtab = {
54	michael	1178	"TB", 0, 0, 4, MAXPARA, MFLG_SLOW, 0,
55	michael	335	{ m_ignore, m_ignore, ms_tb, m_ignore, m_ignore, m_ignore }
56	michael	325	};
57
58			void
59			_modinit(void)
60			{
61			mod_add_cmd(&tb_msgtab);
62			add_capability("TB", CAP_TB, 1);
63
64			mod_add_cmd(&tburst_msgtab);
65			add_capability("TBURST", CAP_TBURST, 1);
66			}
67
68			void
69			_moddeinit(void)
70			{
71			mod_del_cmd(&tb_msgtab);
72			delete_capability("TB");
73
74			mod_del_cmd(&tburst_msgtab);
75			delete_capability("TBURST");
76			}
77
78	michael	953	const char *_version = "$Revision$";
79	michael	325
80			/* ms_tburst()
81			*
82			* parv[0] = sender prefix
83			* parv[1] = channel timestamp
84			* parv[2] = channel
85			* parv[3] = topic timestamp
86			* parv[4] = topic setter
87			* parv[5] = topic
88			*/
89			static void
90			ms_tburst(struct Client client_p, struct Client source_p,
91			int parc, char *parv[])
92			{
93			struct Channel *chptr = NULL;
94	michael	336	int accept_remote = 0;
95			time_t remote_channel_ts = atol(parv[1]);
96			time_t remote_topic_ts = atol(parv[3]);
97	michael	394	const char *topic = "";
98			const char *setby = "";
99	michael	325
100	michael	336	/*
101			* Do NOT test parv[5] for an empty string and return if true!
102			* parv[5] CAN be an empty string, i.e. if the other side wants
103			* to unset our topic. Don't forget: an empty topic is also a
104			* valid topic.
105			*/
106
107
108	michael	325	if ((chptr = hash_find_channel(parv[2])) == NULL)
109			return;
110
111	michael	394	if (parc == 6)
112			{
113			topic = parv[5];
114			setby = parv[4];
115			}
116
117	michael	336	/*
118			* The logic for accepting and rejecting channel topics was
119			* always a bit hairy, so now we got exactly 2 cases where
120			* we would accept a bursted topic
121			*
122			* Case 1:
123			* The TS of the remote channel is older than ours
124			* Case 2:
125			* The TS of the remote channel is equal to ours AND
126			* the TS of the remote topic is newer than ours
127	michael	325	*/
128	michael	336	if (remote_channel_ts < chptr->channelts)
129			accept_remote = 1;
130			else if (remote_channel_ts == chptr->channelts)
131			if (remote_topic_ts > chptr->topic_time)
132			accept_remote = 1;
133
134			if (accept_remote)
135			{
136	michael	1203	int topic_differs = strcmp(chptr->topic, topic);
137	michael	336
138	michael	394	set_channel_topic(chptr, topic, setby, remote_topic_ts);
139	michael	336
140			if (topic_differs)
141			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :%s",
142			ConfigServerHide.hide_servers ? me.name : source_p->name,
143	michael	1203	chptr->chname, chptr->topic);
144	michael	336	}
145
146			/*
147			* Always propagate what we have received, not only if we accept the topic.
148			* This will keep other servers in sync.
149			*/
150	michael	885	sendto_server(source_p, chptr, CAP_TBURST, NOCAPS,
151	michael	336	":%s TBURST %s %s %s %s :%s",
152	michael	394	source_p->name, parv[1], parv[2], parv[3], setby, topic);
153	michael	395	if (parc > 5 && topic != '\0') / unsetting a topic is not supported by TB */
154	michael	885	sendto_server(source_p, chptr, CAP_TB, CAP_TBURST,
155	michael	394	":%s TB %s %s %s :%s",
156			source_p->name, parv[1], parv[2], setby, topic);
157	michael	325	}
158
159			/* ms_tb()
160			*
161			* parv[0] = sender prefix
162			* parv[1] = channel name
163			* parv[2] = topic timestamp
164			* parv[3] = topic setter OR topic itself if parc == 4
165			* parv[4] = topic itself if parc == 5
166			*/
167			#define tb_channel parv[1]
168			#define tb_topicts_str parv[2]
169
170			static void
171			ms_tb(struct Client client_p, struct Client source_p, int parc, char *parv[])
172			{
173			struct Channel *chptr;
174			time_t tb_topicts = atol(tb_topicts_str);
175			char *tb_whoset = NULL;
176			char *tb_topic = NULL;
177
178			if ((chptr = hash_find_channel(tb_channel)) == NULL)
179			return;
180
181			if (parc == 5)
182			{
183			tb_whoset = parv[3];
184			tb_topic = parv[4];
185			}
186			else
187			{
188			tb_whoset = source_p->name;
189			tb_topic = parv[3];
190			}
191
192			set_topic(source_p, chptr, tb_topicts, tb_whoset, tb_topic);
193			}
194
195			/*
196			* set_topic
197			*
198			* inputs - source_p pointer
199			* - channel pointer
200			* - topicts to set
201			* - who to set as who doing the topic
202			* - topic
203			* output - none
204			* Side effects - simply propagates topic as needed
205			* little helper function, could be removed
206			*/
207			static void
208	michael	335	set_topic(struct Client source_p, struct Channel chptr, time_t topicts,
209			const char topicwho, const char topic)
210	michael	325	{
211	michael	1203	int new_topic = strcmp(chptr->topic, topic);
212	michael	335
213	michael	325	set_channel_topic(chptr, topic, topicwho, topicts);
214
215	michael	335	/* Only send TOPIC to channel if it's different */
216			if (new_topic)
217	michael	325	sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :%s",
218			ConfigServerHide.hide_servers ? me.name : source_p->name,
219	michael	1203	chptr->chname, chptr->topic);
220	michael	325
221	michael	885	sendto_server(source_p, chptr, CAP_TBURST, NOCAPS,
222	michael	325	":%s TBURST %lu %s %lu %s :%s",
223			me.name, (unsigned long)chptr->channelts, chptr->chname,
224			(unsigned long)chptr->topic_time,
225	michael	1203	chptr->topic_info,
226			chptr->topic);
227	michael	885	sendto_server(source_p, chptr, CAP_TB, CAP_TBURST,
228	michael	325	":%s TB %s %lu %s :%s",
229			me.name, chptr->chname,
230			(unsigned long)chptr->topic_time,
231	michael	1203	chptr->topic_info,
232			chptr->topic);
233	michael	325	}