8.2.36/src/extban.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2015-2016 plexus development team
 *  Copyright (c) 2019-2020 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 extban.c
 * \brief Implements extended channel bans.
 * \version $Id$
 */

#include "stdinc.h"
#include "ircd_defs.h"
#include "list.h"
#include "irc_string.h"
#include "user.h"
#include "isupport.h"
#include "extban.h"


static dlink_list extban_list;
static unsigned int matching_mask, acting_mask;


static unsigned int
extban_find_mask(void)
{
  dlink_node *node;
  unsigned int used = 0;
  unsigned int i;

  DLINK_FOREACH(node, extban_list.head)
  {
    const struct Extban *extban = node->data;
    used |= extban->flag;
  }

  for (i = 1; (i < EXTBAN_MASK) && (used & i); i <<= 1)
    ;

  return i;
}

void
extban_init(void)
{
  extban_add(&extban_account);
  extban_add(&extban_channel);
  extban_add(&extban_fingerprint);
  extban_add(&extban_gecos);
  extban_add(&extban_join);
  extban_add(&extban_mute);
  extban_add(&extban_nick);
  extban_add(&extban_operclass);
  extban_add(&extban_server);
  extban_add(&extban_tlsinfo);
  extban_add(&extban_usermode);

  const char *ptr = extban_get_isupport();
  if (ptr)
    isupport_add("EXTBAN", ptr, -1);
}

void
extban_add(struct Extban *extban)
{
  unsigned int mask = extban_find_mask();

  if (mask == 0)
    return;

  extban->flag = mask;
  dlinkAdd(extban, &extban->node, &extban_list);

  if (extban->type & EXTBAN_MATCHING)
    matching_mask |= mask;
  if (extban->type & EXTBAN_ACTING)
    acting_mask |= mask;
}

void
extban_del(struct Extban *extban)
{
  if (extban->flag == 0)
    return;

  dlinkDelete(&extban->node, &extban_list);

  matching_mask &= ~extban->flag;
  acting_mask &= ~extban->flag;
}

struct Extban *
extban_find(unsigned char c)
{
  dlink_node *node;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->character == c)
      return extban;
  }

  return NULL;
}

struct Extban *
extban_find_flag(unsigned int flag)
{
  dlink_node *node;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->flag == flag)
      return extban;
  }

  return NULL;
}

enum extban_type
extban_parse(const char *mask, unsigned int *input_extbans, unsigned int *offset)
{
  *input_extbans = 0;
  *offset = 0;

  if (*mask == '$' && IsAlpha(*(mask + 1)) && *(mask + 2) == ':')
  {
    struct Extban *extban = extban_find(*(mask + 1));
    if (extban == NULL)
      return EXTBAN_INVALID;

    *input_extbans |= extban->flag;
    *offset += 3;
    mask += 3;

    /* Matching extbans take a special parameter, so stop reading */
    if (extban->type == EXTBAN_MATCHING)
      return EXTBAN_MATCHING;

    if (IsAlpha(*mask) && *(mask + 1) == ':')
    {
      extban = extban_find(*mask);
      if (extban == NULL)
        return EXTBAN_INVALID;

      /* Two acting extbans make no sense */
      if (extban->type == EXTBAN_ACTING)
        return EXTBAN_INVALID;

      /* Check parameter */
      if (extban->is_valid && extban->is_valid(mask) == EXTBAN_INVALID)
        return EXTBAN_INVALID;

      *input_extbans |= extban->flag;
      *offset += 2;
      mask += 2;

      return EXTBAN_MATCHING;
    }

    return EXTBAN_ACTING;
  }

  return EXTBAN_NONE;
}

unsigned int
extban_format(unsigned int e, char *buf)
{
  dlink_node *node;
  unsigned int written = 0;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->type != EXTBAN_ACTING)
      continue;

    if (extban->flag & e)
    {
      if (written == 0)
      {
        written++;
        *buf++ = '$';
      }

      *buf++ = extban->character;
      *buf++ = ':';
      written += 2;

      break;
    }
  }

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;

    if (extban->type != EXTBAN_MATCHING)
      continue;

    if (extban->flag & e)
    {
      if (written == 0)
      {
        written++;
        *buf++ = '$';
      }

      *buf++ = extban->character;
      *buf++ = ':';
      written += 2;

      break;
    }
  }

  return written;
}

unsigned int
extban_matching_mask(void)
{
  return matching_mask;
}

unsigned int
extban_acting_mask(void)
{
  return acting_mask;
}

const char *
extban_get_isupport(void)
{
  dlink_node *node;
  char extban_chars[256] = { 0 };
  static char buf[sizeof(extban_chars) + 3 /* +3 = $,\0 */ ];

  if (dlink_list_length(&extban_list) == 0)
    return NULL;

  DLINK_FOREACH(node, extban_list.head)
  {
    struct Extban *extban = node->data;
    extban_chars[extban->character] = extban->character;
  }

  char *p = buf + strlcpy(buf, "$,", sizeof(buf));

  for (unsigned int i = 0; i < 256; ++i)
    if (extban_chars[i])
      *p++ = extban_chars[i];
  *p++ = '\0';

  return buf;
}

Revision:	9784
Committed:	Fri Dec 4 13:30:16 2020 UTC (5 years, 10 months ago) by michael
Content type:	text/x-csrc
File size:	5588 byte(s)
Log Message:	RELEASE TAG 8.2.36
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 2015-2016 plexus development team
5	* Copyright (c) 2019-2020 ircd-hybrid development team
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
20	* USA
21	*/
22
23	/*! \file extban.c
24	* \brief Implements extended channel bans.
25	* \version $Id$
26	*/
27
28	#include "stdinc.h"
29	#include "ircd_defs.h"
30	#include "list.h"
31	#include "irc_string.h"
32	#include "user.h"
33	#include "isupport.h"
34	#include "extban.h"
35
36
37	static dlink_list extban_list;
38	static unsigned int matching_mask, acting_mask;
39
40
41	static unsigned int
42	extban_find_mask(void)
43	{
44	dlink_node *node;
45	unsigned int used = 0;
46	unsigned int i;
47
48	DLINK_FOREACH(node, extban_list.head)
49	{
50	const struct Extban *extban = node->data;
51	used \|= extban->flag;
52	}
53
54	for (i = 1; (i < EXTBAN_MASK) && (used & i); i <<= 1)
55	;
56
57	return i;
58	}
59
60	void
61	extban_init(void)
62	{
63	extban_add(&extban_account);
64	extban_add(&extban_channel);
65	extban_add(&extban_fingerprint);
66	extban_add(&extban_gecos);
67	extban_add(&extban_join);
68	extban_add(&extban_mute);
69	extban_add(&extban_nick);
70	extban_add(&extban_operclass);
71	extban_add(&extban_server);
72	extban_add(&extban_tlsinfo);
73	extban_add(&extban_usermode);
74
75	const char *ptr = extban_get_isupport();
76	if (ptr)
77	isupport_add("EXTBAN", ptr, -1);
78	}
79
80	void
81	extban_add(struct Extban *extban)
82	{
83	unsigned int mask = extban_find_mask();
84
85	if (mask == 0)
86	return;
87
88	extban->flag = mask;
89	dlinkAdd(extban, &extban->node, &extban_list);
90
91	if (extban->type & EXTBAN_MATCHING)
92	matching_mask \|= mask;
93	if (extban->type & EXTBAN_ACTING)
94	acting_mask \|= mask;
95	}
96
97	void
98	extban_del(struct Extban *extban)
99	{
100	if (extban->flag == 0)
101	return;
102
103	dlinkDelete(&extban->node, &extban_list);
104
105	matching_mask &= ~extban->flag;
106	acting_mask &= ~extban->flag;
107	}
108
109	struct Extban *
110	extban_find(unsigned char c)
111	{
112	dlink_node *node;
113
114	DLINK_FOREACH(node, extban_list.head)
115	{
116	struct Extban *extban = node->data;
117
118	if (extban->character == c)
119	return extban;
120	}
121
122	return NULL;
123	}
124
125	struct Extban *
126	extban_find_flag(unsigned int flag)
127	{
128	dlink_node *node;
129
130	DLINK_FOREACH(node, extban_list.head)
131	{
132	struct Extban *extban = node->data;
133
134	if (extban->flag == flag)
135	return extban;
136	}
137
138	return NULL;
139	}
140
141	enum extban_type
142	extban_parse(const char mask, unsigned int input_extbans, unsigned int *offset)
143	{
144	*input_extbans = 0;
145	*offset = 0;
146
147	if (mask == '$' && IsAlpha((mask + 1)) && *(mask + 2) == ':')
148	{
149	struct Extban extban = extban_find((mask + 1));
150	if (extban == NULL)
151	return EXTBAN_INVALID;
152
153	*input_extbans \|= extban->flag;
154	*offset += 3;
155	mask += 3;
156
157	/* Matching extbans take a special parameter, so stop reading */
158	if (extban->type == EXTBAN_MATCHING)
159	return EXTBAN_MATCHING;
160
161	if (IsAlpha(mask) && (mask + 1) == ':')
162	{
163	extban = extban_find(*mask);
164	if (extban == NULL)
165	return EXTBAN_INVALID;
166
167	/* Two acting extbans make no sense */
168	if (extban->type == EXTBAN_ACTING)
169	return EXTBAN_INVALID;
170
171	/* Check parameter */
172	if (extban->is_valid && extban->is_valid(mask) == EXTBAN_INVALID)
173	return EXTBAN_INVALID;
174
175	*input_extbans \|= extban->flag;
176	*offset += 2;
177	mask += 2;
178
179	return EXTBAN_MATCHING;
180	}
181
182	return EXTBAN_ACTING;
183	}
184
185	return EXTBAN_NONE;
186	}
187
188	unsigned int
189	extban_format(unsigned int e, char *buf)
190	{
191	dlink_node *node;
192	unsigned int written = 0;
193
194	DLINK_FOREACH(node, extban_list.head)
195	{
196	struct Extban *extban = node->data;
197
198	if (extban->type != EXTBAN_ACTING)
199	continue;
200
201	if (extban->flag & e)
202	{
203	if (written == 0)
204	{
205	written++;
206	*buf++ = '$';
207	}
208
209	*buf++ = extban->character;
210	*buf++ = ':';
211	written += 2;
212
213	break;
214	}
215	}
216
217	DLINK_FOREACH(node, extban_list.head)
218	{
219	struct Extban *extban = node->data;
220
221	if (extban->type != EXTBAN_MATCHING)
222	continue;
223
224	if (extban->flag & e)
225	{
226	if (written == 0)
227	{
228	written++;
229	*buf++ = '$';
230	}
231
232	*buf++ = extban->character;
233	*buf++ = ':';
234	written += 2;
235
236	break;
237	}
238	}
239
240	return written;
241	}
242
243	unsigned int
244	extban_matching_mask(void)
245	{
246	return matching_mask;
247	}
248
249	unsigned int
250	extban_acting_mask(void)
251	{
252	return acting_mask;
253	}
254
255	const char *
256	extban_get_isupport(void)
257	{
258	dlink_node *node;
259	char extban_chars[256] = { 0 };
260	static char buf[sizeof(extban_chars) + 3 /* +3 = $,\0 */ ];
261
262	if (dlink_list_length(&extban_list) == 0)
263	return NULL;
264
265	DLINK_FOREACH(node, extban_list.head)
266	{
267	struct Extban *extban = node->data;
268	extban_chars[extban->character] = extban->character;
269	}
270
271	char *p = buf + strlcpy(buf, "$,", sizeof(buf));
272
273	for (unsigned int i = 0; i < 256; ++i)
274	if (extban_chars[i])
275	*p++ = extban_chars[i];
276	*p++ = '\0';
277
278	return buf;
279	}
280