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_nick);
  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;

      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:	9292
Committed:	Sun Feb 23 10:37:06 2020 UTC (5 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	5557 byte(s)
Log Message:	- Extban $n of type 'acting' has been implemented. This extban prevents matching users from changing their nick while in the channel. Users with voice or above are not affected. - Channel mode +N has been changed so channel members with +v can change nick names, too
#	User	Rev	Content
1	michael	9234	/*
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	michael	9238	* \version $Id$
26	michael	9234	*/
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	michael	9292	extban_add(&extban_nick);
70	michael	9234	extban_add(&extban_operclass);
71			extban_add(&extban_server);
72			extban_add(&extban_usermode);
73
74			const char *ptr = extban_get_isupport();
75			if (ptr)
76			isupport_add("EXTBAN", ptr, -1);
77			}
78
79			void
80			extban_add(struct Extban *extban)
81			{
82			unsigned int mask = extban_find_mask();
83
84			if (mask == 0)
85			return;
86
87			extban->flag = mask;
88			dlinkAdd(extban, &extban->node, &extban_list);
89
90			if (extban->type & EXTBAN_MATCHING)
91			matching_mask \|= mask;
92			if (extban->type & EXTBAN_ACTING)
93			acting_mask \|= mask;
94			}
95
96			void
97			extban_del(struct Extban *extban)
98			{
99			if (extban->flag == 0)
100			return;
101
102			dlinkDelete(&extban->node, &extban_list);
103
104			matching_mask &= ~extban->flag;
105			acting_mask &= ~extban->flag;
106			}
107
108			struct Extban *
109			extban_find(unsigned char c)
110			{
111			dlink_node *node;
112
113			DLINK_FOREACH(node, extban_list.head)
114			{
115			struct Extban *extban = node->data;
116
117			if (extban->character == c)
118			return extban;
119			}
120
121			return NULL;
122			}
123
124			struct Extban *
125			extban_find_flag(unsigned int flag)
126			{
127			dlink_node *node;
128
129			DLINK_FOREACH(node, extban_list.head)
130			{
131			struct Extban *extban = node->data;
132
133			if (extban->flag == flag)
134			return extban;
135			}
136
137			return NULL;
138			}
139
140			enum extban_type
141			extban_parse(const char mask, unsigned int input_extbans, unsigned int *offset)
142			{
143			*input_extbans = 0;
144			*offset = 0;
145
146			if (mask == '$' && IsAlpha((mask + 1)) && *(mask + 2) == ':')
147			{
148			struct Extban extban = extban_find((mask + 1));
149			if (extban == NULL)
150			return EXTBAN_INVALID;
151
152			*input_extbans \|= extban->flag;
153			*offset += 3;
154			mask += 3;
155
156			/* Matching extbans take a special parameter, so stop reading */
157			if (extban->type == EXTBAN_MATCHING)
158			return EXTBAN_MATCHING;
159
160			if (IsAlpha(mask) && (mask + 1) == ':')
161			{
162			extban = extban_find(*mask);
163			if (extban == NULL)
164			return EXTBAN_INVALID;
165
166			/* Two acting extbans make no sense */
167			if (extban->type == EXTBAN_ACTING)
168			return EXTBAN_INVALID;
169
170			/* Check parameter */
171			if (extban->is_valid && extban->is_valid(mask) == EXTBAN_INVALID)
172			return EXTBAN_INVALID;
173
174			*input_extbans \|= extban->flag;
175			*offset += 2;
176			mask += 2;
177
178			return EXTBAN_MATCHING;
179			}
180
181			return EXTBAN_ACTING;
182			}
183
184			return EXTBAN_NONE;
185			}
186
187			unsigned int
188			extban_format(unsigned int e, char *buf)
189			{
190			dlink_node *node;
191			unsigned int written = 0;
192
193			DLINK_FOREACH(node, extban_list.head)
194			{
195			struct Extban *extban = node->data;
196
197			if (extban->type != EXTBAN_ACTING)
198			continue;
199
200			if (extban->flag & e)
201			{
202			if (written == 0)
203			{
204			written++;
205			*buf++ = '$';
206			}
207
208			*buf++ = extban->character;
209			*buf++ = ':';
210	michael	9262	written += 2;
211	michael	9234
212	michael	9262	break;
213	michael	9234	}
214			}
215
216			DLINK_FOREACH(node, extban_list.head)
217			{
218			struct Extban *extban = node->data;
219
220			if (extban->type != EXTBAN_MATCHING)
221			continue;
222
223			if (extban->flag & e)
224			{
225			if (written == 0)
226			{
227			written++;
228			*buf++ = '$';
229			}
230
231			*buf++ = extban->character;
232			*buf++ = ':';
233			written += 2;
234	michael	9262
235			break;
236	michael	9234	}
237			}
238
239			return written;
240			}
241
242			unsigned int
243			extban_matching_mask(void)
244			{
245			return matching_mask;
246			}
247
248			unsigned int
249			extban_acting_mask(void)
250			{
251			return acting_mask;
252			}
253
254			const char *
255			extban_get_isupport(void)
256			{
257			dlink_node *node;
258			char extban_chars[256] = { 0 };
259			static char buf[sizeof(extban_chars) + 3 /* +3 = $,\0 */ ];
260
261			if (dlink_list_length(&extban_list) == 0)
262			return NULL;
263
264			DLINK_FOREACH(node, extban_list.head)
265			{
266			struct Extban *extban = node->data;
267	michael	9242	extban_chars[extban->character] = extban->character;
268	michael	9234	}
269
270			char *p = buf + strlcpy(buf, "$,", sizeof(buf));
271
272			for (unsigned int i = 0; i < 256; ++i)
273			if (extban_chars[i])
274			*p++ = extban_chars[i];
275			*p++ = '\0';
276
277			return buf;
278			}
279