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_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:	9459
Committed:	Tue Jun 30 19:55:32 2020 UTC (5 years, 1 month ago) by michael
Content type:	text/x-csrc
File size:	5588 byte(s)
Log Message:	- Extban $t of type 'acting' has been implemented. This extban allows matching based on TLS protocol version and/or cipher suite
#	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	michael	9459	extban_add(&extban_tlsinfo);
73	michael	9234	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	michael	9262	written += 2;
212	michael	9234
213	michael	9262	break;
214	michael	9234	}
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	michael	9262
236			break;
237	michael	9234	}
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 = $,\0 */ ];
261
262			if (dlink_list_length(&extban_list) == 0)
263			return NULL;
264
265			DLINK_FOREACH(node, extban_list.head)
266			{
267			struct Extban *extban = node->data;
268	michael	9242	extban_chars[extban->character] = extban->character;
269	michael	9234	}
270
271			char *p = buf + strlcpy(buf, "$,", 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