ircd-hybrid-8/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, 6, 0, MFLG_SLOW, 0,
  { m_ignore, m_ignore, ms_tburst, m_ignore, m_ignore, m_ignore }
};

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

#ifndef STATIC_MODULES

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: 122 $";

#endif /* !STATIC_MODULES */

/* 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]);

  /*
   * 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;

  /*
   * 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 ? chptr->topic : "", parv[5]);

    set_channel_topic(chptr, parv[5], parv[4], 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 == NULL ? "" : 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, NULL, chptr, CAP_TBURST, NOCAPS, NOFLAGS,
                ":%s TBURST %s %s %s %s :%s",
                source_p->name, parv[1], parv[2], parv[3], parv[4], parv[5]);
  sendto_server(source_p, NULL, chptr, CAP_TB, CAP_TBURST, NOFLAGS,
                ":%s TB %s %s %s :%s",
                source_p->name, parv[1], parv[2], parv[3], parv[4]);
}

/* 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 ? 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 == NULL ? "" : chptr->topic);

  sendto_server(source_p, NULL, chptr, CAP_TBURST, NOCAPS, NOFLAGS,
                ":%s TBURST %lu %s %lu %s :%s",
                me.name, (unsigned long)chptr->channelts, chptr->chname,
                (unsigned long)chptr->topic_time,
                chptr->topic_info == NULL ? "" : chptr->topic_info,
                chptr->topic == NULL ? "" : chptr->topic);
  sendto_server(source_p, NULL, chptr, CAP_TB, CAP_TBURST, NOFLAGS,
                ":%s TB %s %lu %s :%s",
                me.name, chptr->chname,
                (unsigned long)chptr->topic_time, 
                chptr->topic_info == NULL ? "" : chptr->topic_info,
                chptr->topic == NULL ? "" : chptr->topic);
}
Revision:	338
Committed:	Tue Dec 27 07:49:27 2005 UTC (19 years, 8 months ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/modules/m_tburst.c*
File size:	7233 byte(s)
Log Message:	- Don't allow other servers to send less than 4 parameters within TB
#	Content
1	/* 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	* $Id$
29	*/
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	static void set_topic(struct Client , struct Channel , time_t,
46	const char , const char );
47
48	struct Message tburst_msgtab = {
49	"TBURST", 0, 0, 6, 0, MFLG_SLOW, 0,
50	{ m_ignore, m_ignore, ms_tburst, m_ignore, m_ignore, m_ignore }
51	};
52
53	struct Message tb_msgtab = {
54	"TB", 0, 0, 4, 0, MFLG_SLOW, 0,
55	{ m_ignore, m_ignore, ms_tb, m_ignore, m_ignore, m_ignore }
56	};
57
58	#ifndef STATIC_MODULES
59
60	void
61	_modinit(void)
62	{
63	mod_add_cmd(&tb_msgtab);
64	add_capability("TB", CAP_TB, 1);
65
66	mod_add_cmd(&tburst_msgtab);
67	add_capability("TBURST", CAP_TBURST, 1);
68	}
69
70	void
71	_moddeinit(void)
72	{
73	mod_del_cmd(&tb_msgtab);
74	delete_capability("TB");
75
76	mod_del_cmd(&tburst_msgtab);
77	delete_capability("TBURST");
78	}
79
80	const char *_version = "$Revision: 122 $";
81
82	#endif /* !STATIC_MODULES */
83
84	/* ms_tburst()
85	*
86	* parv[0] = sender prefix
87	* parv[1] = channel timestamp
88	* parv[2] = channel
89	* parv[3] = topic timestamp
90	* parv[4] = topic setter
91	* parv[5] = topic
92	*/
93	static void
94	ms_tburst(struct Client client_p, struct Client source_p,
95	int parc, char *parv[])
96	{
97	struct Channel *chptr = NULL;
98	int accept_remote = 0;
99	time_t remote_channel_ts = atol(parv[1]);
100	time_t remote_topic_ts = atol(parv[3]);
101
102	/*
103	* Do NOT test parv[5] for an empty string and return if true!
104	* parv[5] CAN be an empty string, i.e. if the other side wants
105	* to unset our topic. Don't forget: an empty topic is also a
106	* valid topic.
107	*/
108
109
110	if ((chptr = hash_find_channel(parv[2])) == NULL)
111	return;
112
113	/*
114	* The logic for accepting and rejecting channel topics was
115	* always a bit hairy, so now we got exactly 2 cases where
116	* we would accept a bursted topic
117	*
118	* Case 1:
119	* The TS of the remote channel is older than ours
120	* Case 2:
121	* The TS of the remote channel is equal to ours AND
122	* the TS of the remote topic is newer than ours
123	*/
124	if (remote_channel_ts < chptr->channelts)
125	accept_remote = 1;
126	else if (remote_channel_ts == chptr->channelts)
127	if (remote_topic_ts > chptr->topic_time)
128	accept_remote = 1;
129
130	if (accept_remote)
131	{
132	int topic_differs = strcmp(chptr->topic ? chptr->topic : "", parv[5]);
133
134	set_channel_topic(chptr, parv[5], parv[4], remote_topic_ts);
135
136	if (topic_differs)
137	sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :%s",
138	ConfigServerHide.hide_servers ? me.name : source_p->name,
139	chptr->chname, chptr->topic == NULL ? "" : chptr->topic);
140	}
141
142	/*
143	* Always propagate what we have received, not only if we accept the topic.
144	* This will keep other servers in sync.
145	*/
146	sendto_server(source_p, NULL, chptr, CAP_TBURST, NOCAPS, NOFLAGS,
147	":%s TBURST %s %s %s %s :%s",
148	source_p->name, parv[1], parv[2], parv[3], parv[4], parv[5]);
149	sendto_server(source_p, NULL, chptr, CAP_TB, CAP_TBURST, NOFLAGS,
150	":%s TB %s %s %s :%s",
151	source_p->name, parv[1], parv[2], parv[3], parv[4]);
152	}
153
154	/* ms_tb()
155	*
156	* parv[0] = sender prefix
157	* parv[1] = channel name
158	* parv[2] = topic timestamp
159	* parv[3] = topic setter OR topic itself if parc == 4
160	* parv[4] = topic itself if parc == 5
161	*/
162	#define tb_channel parv[1]
163	#define tb_topicts_str parv[2]
164
165	static void
166	ms_tb(struct Client client_p, struct Client source_p, int parc, char *parv[])
167	{
168	struct Channel *chptr;
169	time_t tb_topicts = atol(tb_topicts_str);
170	char *tb_whoset = NULL;
171	char *tb_topic = NULL;
172
173	if ((chptr = hash_find_channel(tb_channel)) == NULL)
174	return;
175
176	if (parc == 5)
177	{
178	tb_whoset = parv[3];
179	tb_topic = parv[4];
180	}
181	else
182	{
183	tb_whoset = source_p->name;
184	tb_topic = parv[3];
185	}
186
187	set_topic(source_p, chptr, tb_topicts, tb_whoset, tb_topic);
188	}
189
190	/*
191	* set_topic
192	*
193	* inputs - source_p pointer
194	* - channel pointer
195	* - topicts to set
196	* - who to set as who doing the topic
197	* - topic
198	* output - none
199	* Side effects - simply propagates topic as needed
200	* little helper function, could be removed
201	*/
202	static void
203	set_topic(struct Client source_p, struct Channel chptr, time_t topicts,
204	const char topicwho, const char topic)
205	{
206	int new_topic = strcmp(chptr->topic ? chptr->topic : "", topic);
207
208	set_channel_topic(chptr, topic, topicwho, topicts);
209
210	/* Only send TOPIC to channel if it's different */
211	if (new_topic)
212	sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :%s",
213	ConfigServerHide.hide_servers ? me.name : source_p->name,
214	chptr->chname, chptr->topic == NULL ? "" : chptr->topic);
215
216	sendto_server(source_p, NULL, chptr, CAP_TBURST, NOCAPS, NOFLAGS,
217	":%s TBURST %lu %s %lu %s :%s",
218	me.name, (unsigned long)chptr->channelts, chptr->chname,
219	(unsigned long)chptr->topic_time,
220	chptr->topic_info == NULL ? "" : chptr->topic_info,
221	chptr->topic == NULL ? "" : chptr->topic);
222	sendto_server(source_p, NULL, chptr, CAP_TB, CAP_TBURST, NOFLAGS,
223	":%s TB %s %lu %s :%s",
224	me.name, chptr->chname,
225	(unsigned long)chptr->topic_time,
226	chptr->topic_info == NULL ? "" : chptr->topic_info,
227	chptr->topic == NULL ? "" : chptr->topic);
228	}