trunk/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_operclass);
  extban_add(&extban_server);
  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;
    }
  }

  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;
    }
  }

  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:	9242
Committed:	Fri Jan 31 18:26:31 2020 UTC (6 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	5502 byte(s)
Error occurred while calculating annotation data.
Log Message:	- extban.c:extban_get_isupport(): remove extraneous cast
#	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_operclass);
70	extban_add(&extban_server);
71	extban_add(&extban_usermode);
72
73	const char *ptr = extban_get_isupport();
74	if (ptr)
75	isupport_add("EXTBAN", ptr, -1);
76	}
77
78	void
79	extban_add(struct Extban *extban)
80	{
81	unsigned int mask = extban_find_mask();
82
83	if (mask == 0)
84	return;
85
86	extban->flag = mask;
87	dlinkAdd(extban, &extban->node, &extban_list);
88
89	if (extban->type & EXTBAN_MATCHING)
90	matching_mask \|= mask;
91	if (extban->type & EXTBAN_ACTING)
92	acting_mask \|= mask;
93	}
94
95	void
96	extban_del(struct Extban *extban)
97	{
98	if (extban->flag == 0)
99	return;
100
101	dlinkDelete(&extban->node, &extban_list);
102
103	matching_mask &= ~extban->flag;
104	acting_mask &= ~extban->flag;
105	}
106
107	struct Extban *
108	extban_find(unsigned char c)
109	{
110	dlink_node *node;
111
112	DLINK_FOREACH(node, extban_list.head)
113	{
114	struct Extban *extban = node->data;
115
116	if (extban->character == c)
117	return extban;
118	}
119
120	return NULL;
121	}
122
123	struct Extban *
124	extban_find_flag(unsigned int flag)
125	{
126	dlink_node *node;
127
128	DLINK_FOREACH(node, extban_list.head)
129	{
130	struct Extban *extban = node->data;
131
132	if (extban->flag == flag)
133	return extban;
134	}
135
136	return NULL;
137	}
138
139	enum extban_type
140	extban_parse(const char mask, unsigned int input_extbans, unsigned int *offset)
141	{
142	*input_extbans = 0;
143	*offset = 0;
144
145	if (mask == '$' && IsAlpha((mask + 1)) && *(mask + 2) == ':')
146	{
147	struct Extban extban = extban_find((mask + 1));
148	if (extban == NULL)
149	return EXTBAN_INVALID;
150
151	*input_extbans \|= extban->flag;
152	*offset += 3;
153	mask += 3;
154
155	/* Matching extbans take a special parameter, so stop reading */
156	if (extban->type == EXTBAN_MATCHING)
157	return EXTBAN_MATCHING;
158
159	if (IsAlpha(mask) && (mask + 1) == ':')
160	{
161	extban = extban_find(*mask);
162	if (extban == NULL)
163	return EXTBAN_INVALID;
164
165	/* Two acting extbans make no sense */
166	if (extban->type == EXTBAN_ACTING)
167	return EXTBAN_INVALID;
168
169	/* Check parameter */
170	if (extban->is_valid && extban->is_valid(mask) == EXTBAN_INVALID)
171	return EXTBAN_INVALID;
172
173	*input_extbans \|= extban->flag;
174	*offset += 2;
175	mask += 2;
176
177	return EXTBAN_MATCHING;
178	}
179
180	return EXTBAN_ACTING;
181	}
182
183	return EXTBAN_NONE;
184	}
185
186	unsigned int
187	extban_format(unsigned int e, char *buf)
188	{
189	dlink_node *node;
190	unsigned int written = 0;
191
192	DLINK_FOREACH(node, extban_list.head)
193	{
194	struct Extban *extban = node->data;
195
196	if (extban->type != EXTBAN_ACTING)
197	continue;
198
199	if (extban->flag & e)
200	{
201	if (written == 0)
202	{
203	written++;
204	*buf++ = '$';
205	}
206
207	*buf++ = extban->character;
208	*buf++ = ':';
209
210	written += 2;
211	}
212	}
213
214	DLINK_FOREACH(node, extban_list.head)
215	{
216	struct Extban *extban = node->data;
217
218	if (extban->type != EXTBAN_MATCHING)
219	continue;
220
221	if (extban->flag & e)
222	{
223	if (written == 0)
224	{
225	written++;
226	*buf++ = '$';
227	}
228
229	*buf++ = extban->character;
230	*buf++ = ':';
231	written += 2;
232	}
233	}
234
235	return written;
236	}
237
238	unsigned int
239	extban_matching_mask(void)
240	{
241	return matching_mask;
242	}
243
244	unsigned int
245	extban_acting_mask(void)
246	{
247	return acting_mask;
248	}
249
250	const char *
251	extban_get_isupport(void)
252	{
253	dlink_node *node;
254	char extban_chars[256] = { 0 };
255	static char buf[sizeof(extban_chars) + 3 /* +3 = $,\0 */ ];
256
257	if (dlink_list_length(&extban_list) == 0)
258	return NULL;
259
260	DLINK_FOREACH(node, extban_list.head)
261	{
262	struct Extban *extban = node->data;
263	extban_chars[extban->character] = extban->character;
264	}
265
266	char *p = buf + strlcpy(buf, "$,", sizeof(buf));
267
268	for (unsigned int i = 0; i < 256; ++i)
269	if (extban_chars[i])
270	*p++ = extban_chars[i];
271	*p++ = '\0';
272
273	return buf;
274	}
275