8.2.x/modules/m_dline.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2018 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 m_dline.c
 * \brief Includes required functions for processing the DLINE command.
 * \version $Id$
 */

#include "stdinc.h"
#include "list.h"
#include "client.h"
#include "irc_string.h"
#include "conf.h"
#include "conf_cluster.h"
#include "conf_shared.h"
#include "ircd.h"
#include "hostmask.h"
#include "numeric.h"
#include "log.h"
#include "misc.h"
#include "send.h"
#include "server_capab.h"
#include "parse.h"
#include "modules.h"
#include "memory.h"


static void
dline_check(const struct AddressRec *arec)
{
  dlink_node *node, *node_next;

  DLINK_FOREACH_SAFE(node, node_next, local_client_list.head)
  {
    struct Client *client_p = node->data;

    if (IsDead(client_p))
      continue;

    switch (arec->masktype)
    {
      case HM_IPV4:
        if (client_p->ip.ss.ss_family == AF_INET)
          if (match_ipv4(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
            conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
        break;
      case HM_IPV6:
        if (client_p->ip.ss.ss_family == AF_INET6)
          if (match_ipv6(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
            conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
        break;
      default: break;
    }
  }

  DLINK_FOREACH_SAFE(node, node_next, unknown_list.head)
  {
    struct Client *client_p = node->data;

    if (IsDead(client_p))
      continue;

    switch (arec->masktype)
    {
      case HM_IPV4:
        if (client_p->ip.ss.ss_family == AF_INET)
          if (match_ipv4(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
            conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
        break;
      case HM_IPV6:
        if (client_p->ip.ss.ss_family == AF_INET6)
          if (match_ipv6(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
            conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
        break;
      default: break;
    }
  }
}

/* dline_add()
 *
 * inputs       -
 * output       - NONE
 * side effects - dline as given is placed
 */
static void
dline_handle(struct Client *source_p, struct aline_ctx *aline)
{
  char buf[IRCD_BUFSIZE];
  struct irc_ssaddr addr;
  int bits = 0, aftype = 0;

  if (!HasFlag(source_p, FLAGS_SERVICE) && valid_wild_card(1, aline->host) == false)
  {
    sendto_one_notice(source_p, &me,
                      ":Please include at least %u non-wildcard characters with the mask",
                      ConfigGeneral.min_nonwildcard);
    return;
  }

  switch (parse_netmask(aline->host, &addr, &bits))
  {
    case HM_IPV4:
      if (!HasFlag(source_p, FLAGS_SERVICE) && (unsigned int)bits < ConfigGeneral.dline_min_cidr)
      {
        if (IsClient(source_p))
          sendto_one_notice(source_p, &me, ":For safety, bitmasks less than %u require conf access.",
                            ConfigGeneral.dline_min_cidr);
        return;
      }

      aftype = AF_INET;
      break;
    case HM_IPV6:
      if (!HasFlag(source_p, FLAGS_SERVICE) && (unsigned int)bits < ConfigGeneral.dline_min_cidr6)
      {
        if (IsClient(source_p))
          sendto_one_notice(source_p, &me, ":For safety, bitmasks less than %u require conf access.",
                            ConfigGeneral.dline_min_cidr6);
        return;
      }

      aftype = AF_INET6;
      break;
    default:  /* HM_HOST */
     return;
  }

  struct MaskItem *conf;
  if ((conf = find_conf_by_address(NULL, &addr, CONF_DLINE, aftype, NULL, NULL, 1)))
  {
    if (IsClient(source_p))
      sendto_one_notice(source_p, &me, ":[%s] already D-lined by [%s] - %s",
                        aline->host, conf->host, conf->reason);
    return;
  }

  if (aline->duration)
    snprintf(buf, sizeof(buf), "Temporary D-line %ju min. - %.*s (%s)",
             aline->duration / 60, REASONLEN, aline->reason, date_iso8601(0));
  else
    snprintf(buf, sizeof(buf), "%.*s (%s)", REASONLEN, aline->reason, date_iso8601(0));

  conf = conf_make(CONF_DLINE);
  conf->host = xstrdup(aline->host);
  conf->reason = xstrdup(buf);
  conf->setat = CurrentTime;
  SetConfDatabase(conf);

  if (aline->duration)
  {
    conf->until = CurrentTime + aline->duration;

    if (IsClient(source_p))
      sendto_one_notice(source_p, &me, ":Added temporary %ju min. D-Line [%s]",
                        aline->duration / 60, conf->host);

    sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
                         "%s added temporary %ju min. D-Line for [%s] [%s]",
                         get_oper_name(source_p), aline->duration / 60,
                         conf->host, conf->reason);
    ilog(LOG_TYPE_DLINE, "%s added temporary %ju min. D-Line for [%s] [%s]",
         get_oper_name(source_p), aline->duration / 60, conf->host, conf->reason);
  }
  else
  {
    if (IsClient(source_p))
      sendto_one_notice(source_p, &me, ":Added D-Line [%s]", conf->host);

    sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
                         "%s added D-Line for [%s] [%s]",
                         get_oper_name(source_p), conf->host, conf->reason);
    ilog(LOG_TYPE_DLINE, "%s added D-Line for [%s] [%s]",
         get_oper_name(source_p), conf->host, conf->reason);
  }

  dline_check(add_conf_by_address(CONF_DLINE, conf));
}

/* mo_dline()
 *
 * inputs       - pointer to server
 *              - pointer to client
 *              - parameter count
 *              - parameter list
 * output       -
 * side effects - D line is added
 *
 */
static int
mo_dline(struct Client *source_p, int parc, char *parv[])
{
  struct aline_ctx aline = { .add = true, .requires_user = false };

  if (!HasOFlag(source_p, OPER_FLAG_DLINE))
  {
    sendto_one_numeric(source_p, &me, ERR_NOPRIVS, "dline");
    return 0;
  }

  if (parse_aline("DLINE", source_p, parc, parv, &aline) == false)
    return 0;

  if (aline.server)
  {
    sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
                       aline.server, aline.duration, aline.host, aline.reason);

    /* Allow ON to apply local dline as well if it matches */
    if (match(aline.server, me.name))
      return 0;
  }
  else
    cluster_distribute(source_p, "DLINE", CAPAB_DLN, CLUSTER_DLINE,
                       "%ju %s :%s", aline.duration, aline.host, aline.reason);

  dline_handle(source_p, &aline);
  return 0;
}

/*! \brief DLINE command handler
 *
 * \param source_p Pointer to allocated Client struct from which the message
 *                 originally comes from.  This can be a local or remote client.
 * \param parc     Integer holding the number of supplied arguments.
 * \param parv     Argument vector where parv[0] .. parv[parc-1] are non-NULL
 *                 pointers.
 * \note Valid arguments for this command are:
 *      - parv[0] = command
 *      - parv[1] = target server mask
 *      - parv[2] = duration in seconds
 *      - parv[3] = IP address
 *      - parv[4] = reason
 */
static int
ms_dline(struct Client *source_p, int parc, char *parv[])
{
  struct aline_ctx aline =
  {
    .add = true,
    .requires_user = false,
    .host = parv[3],
    .reason = parv[4],
    .server = parv[1],
    .duration = strtoumax(parv[2], NULL, 10)
  };

  if (parc != 5 || EmptyString(parv[parc - 1]))
    return 0;

  sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
                     aline.server, aline.duration, aline.host, aline.reason);

  if (match(aline.server, me.name))
    return 0;

  if (HasFlag(source_p, FLAGS_SERVICE) ||
      shared_find(SHARED_DLINE, source_p->servptr->name,
                  source_p->username, source_p->host))
    dline_handle(source_p, &aline);

  return 0;
}

static struct Message dline_msgtab =
{
  .cmd = "DLINE",
  .args_min = 2,
  .args_max = MAXPARA,
  .handlers[UNREGISTERED_HANDLER] = m_unregistered,
  .handlers[CLIENT_HANDLER] = m_not_oper,
  .handlers[SERVER_HANDLER] = ms_dline,
  .handlers[ENCAP_HANDLER] = m_ignore,
  .handlers[OPER_HANDLER] = mo_dline
};

static void
module_init(void)
{
  mod_add_cmd(&dline_msgtab);
  capab_add("DLN", CAPAB_DLN);
}

static void
module_exit(void)
{
  mod_del_cmd(&dline_msgtab);
  capab_del("DLN");
}

struct module module_entry =
{
  .version = "$Revision$",
  .modinit = module_init,
  .modexit = module_exit,
};
Revision:	8675
Committed:	Sat Nov 24 17:25:23 2018 UTC (7 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	9100 byte(s)
Log Message:	- Further parse_aline() cleanups; get rid of find_user_host() - /KLINE and /DLINE now no longer supports nick names
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 1997-2018 ircd-hybrid development team
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	* USA
20	*/
21
22	/*! \file m_dline.c
23	* \brief Includes required functions for processing the DLINE command.
24	* \version $Id$
25	*/
26
27	#include "stdinc.h"
28	#include "list.h"
29	#include "client.h"
30	#include "irc_string.h"
31	#include "conf.h"
32	#include "conf_cluster.h"
33	#include "conf_shared.h"
34	#include "ircd.h"
35	#include "hostmask.h"
36	#include "numeric.h"
37	#include "log.h"
38	#include "misc.h"
39	#include "send.h"
40	#include "server_capab.h"
41	#include "parse.h"
42	#include "modules.h"
43	#include "memory.h"
44
45
46	static void
47	dline_check(const struct AddressRec *arec)
48	{
49	dlink_node node, node_next;
50
51	DLINK_FOREACH_SAFE(node, node_next, local_client_list.head)
52	{
53	struct Client *client_p = node->data;
54
55	if (IsDead(client_p))
56	continue;
57
58	switch (arec->masktype)
59	{
60	case HM_IPV4:
61	if (client_p->ip.ss.ss_family == AF_INET)
62	if (match_ipv4(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
63	conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
64	break;
65	case HM_IPV6:
66	if (client_p->ip.ss.ss_family == AF_INET6)
67	if (match_ipv6(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
68	conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
69	break;
70	default: break;
71	}
72	}
73
74	DLINK_FOREACH_SAFE(node, node_next, unknown_list.head)
75	{
76	struct Client *client_p = node->data;
77
78	if (IsDead(client_p))
79	continue;
80
81	switch (arec->masktype)
82	{
83	case HM_IPV4:
84	if (client_p->ip.ss.ss_family == AF_INET)
85	if (match_ipv4(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
86	conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
87	break;
88	case HM_IPV6:
89	if (client_p->ip.ss.ss_family == AF_INET6)
90	if (match_ipv6(&client_p->ip, &arec->Mask.ipa.addr, arec->Mask.ipa.bits))
91	conf_try_ban(client_p, CLIENT_BAN_DLINE, arec->conf->reason);
92	break;
93	default: break;
94	}
95	}
96	}
97
98	/* dline_add()
99	*
100	* inputs -
101	* output - NONE
102	* side effects - dline as given is placed
103	*/
104	static void
105	dline_handle(struct Client source_p, struct aline_ctx aline)
106	{
107	char buf[IRCD_BUFSIZE];
108	struct irc_ssaddr addr;
109	int bits = 0, aftype = 0;
110
111	if (!HasFlag(source_p, FLAGS_SERVICE) && valid_wild_card(1, aline->host) == false)
112	{
113	sendto_one_notice(source_p, &me,
114	":Please include at least %u non-wildcard characters with the mask",
115	ConfigGeneral.min_nonwildcard);
116	return;
117	}
118
119	switch (parse_netmask(aline->host, &addr, &bits))
120	{
121	case HM_IPV4:
122	if (!HasFlag(source_p, FLAGS_SERVICE) && (unsigned int)bits < ConfigGeneral.dline_min_cidr)
123	{
124	if (IsClient(source_p))
125	sendto_one_notice(source_p, &me, ":For safety, bitmasks less than %u require conf access.",
126	ConfigGeneral.dline_min_cidr);
127	return;
128	}
129
130	aftype = AF_INET;
131	break;
132	case HM_IPV6:
133	if (!HasFlag(source_p, FLAGS_SERVICE) && (unsigned int)bits < ConfigGeneral.dline_min_cidr6)
134	{
135	if (IsClient(source_p))
136	sendto_one_notice(source_p, &me, ":For safety, bitmasks less than %u require conf access.",
137	ConfigGeneral.dline_min_cidr6);
138	return;
139	}
140
141	aftype = AF_INET6;
142	break;
143	default: /* HM_HOST */
144	return;
145	}
146
147	struct MaskItem *conf;
148	if ((conf = find_conf_by_address(NULL, &addr, CONF_DLINE, aftype, NULL, NULL, 1)))
149	{
150	if (IsClient(source_p))
151	sendto_one_notice(source_p, &me, ":[%s] already D-lined by [%s] - %s",
152	aline->host, conf->host, conf->reason);
153	return;
154	}
155
156	if (aline->duration)
157	snprintf(buf, sizeof(buf), "Temporary D-line %ju min. - %.*s (%s)",
158	aline->duration / 60, REASONLEN, aline->reason, date_iso8601(0));
159	else
160	snprintf(buf, sizeof(buf), "%.*s (%s)", REASONLEN, aline->reason, date_iso8601(0));
161
162	conf = conf_make(CONF_DLINE);
163	conf->host = xstrdup(aline->host);
164	conf->reason = xstrdup(buf);
165	conf->setat = CurrentTime;
166	SetConfDatabase(conf);
167
168	if (aline->duration)
169	{
170	conf->until = CurrentTime + aline->duration;
171
172	if (IsClient(source_p))
173	sendto_one_notice(source_p, &me, ":Added temporary %ju min. D-Line [%s]",
174	aline->duration / 60, conf->host);
175
176	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
177	"%s added temporary %ju min. D-Line for [%s] [%s]",
178	get_oper_name(source_p), aline->duration / 60,
179	conf->host, conf->reason);
180	ilog(LOG_TYPE_DLINE, "%s added temporary %ju min. D-Line for [%s] [%s]",
181	get_oper_name(source_p), aline->duration / 60, conf->host, conf->reason);
182	}
183	else
184	{
185	if (IsClient(source_p))
186	sendto_one_notice(source_p, &me, ":Added D-Line [%s]", conf->host);
187
188	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
189	"%s added D-Line for [%s] [%s]",
190	get_oper_name(source_p), conf->host, conf->reason);
191	ilog(LOG_TYPE_DLINE, "%s added D-Line for [%s] [%s]",
192	get_oper_name(source_p), conf->host, conf->reason);
193	}
194
195	dline_check(add_conf_by_address(CONF_DLINE, conf));
196	}
197
198	/* mo_dline()
199	*
200	* inputs - pointer to server
201	* - pointer to client
202	* - parameter count
203	* - parameter list
204	* output -
205	* side effects - D line is added
206	*
207	*/
208	static int
209	mo_dline(struct Client source_p, int parc, char parv[])
210	{
211	struct aline_ctx aline = { .add = true, .requires_user = false };
212
213	if (!HasOFlag(source_p, OPER_FLAG_DLINE))
214	{
215	sendto_one_numeric(source_p, &me, ERR_NOPRIVS, "dline");
216	return 0;
217	}
218
219	if (parse_aline("DLINE", source_p, parc, parv, &aline) == false)
220	return 0;
221
222	if (aline.server)
223	{
224	sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
225	aline.server, aline.duration, aline.host, aline.reason);
226
227	/* Allow ON to apply local dline as well if it matches */
228	if (match(aline.server, me.name))
229	return 0;
230	}
231	else
232	cluster_distribute(source_p, "DLINE", CAPAB_DLN, CLUSTER_DLINE,
233	"%ju %s :%s", aline.duration, aline.host, aline.reason);
234
235	dline_handle(source_p, &aline);
236	return 0;
237	}
238
239	/*! \brief DLINE command handler
240	*
241	* \param source_p Pointer to allocated Client struct from which the message
242	* originally comes from. This can be a local or remote client.
243	* \param parc Integer holding the number of supplied arguments.
244	* \param parv Argument vector where parv[0] .. parv[parc-1] are non-NULL
245	* pointers.
246	* \note Valid arguments for this command are:
247	* - parv[0] = command
248	* - parv[1] = target server mask
249	* - parv[2] = duration in seconds
250	* - parv[3] = IP address
251	* - parv[4] = reason
252	*/
253	static int
254	ms_dline(struct Client source_p, int parc, char parv[])
255	{
256	struct aline_ctx aline =
257	{
258	.add = true,
259	.requires_user = false,
260	.host = parv[3],
261	.reason = parv[4],
262	.server = parv[1],
263	.duration = strtoumax(parv[2], NULL, 10)
264	};
265
266	if (parc != 5 \|\| EmptyString(parv[parc - 1]))
267	return 0;
268
269	sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
270	aline.server, aline.duration, aline.host, aline.reason);
271
272	if (match(aline.server, me.name))
273	return 0;
274
275	if (HasFlag(source_p, FLAGS_SERVICE) \|\|
276	shared_find(SHARED_DLINE, source_p->servptr->name,
277	source_p->username, source_p->host))
278	dline_handle(source_p, &aline);
279
280	return 0;
281	}
282
283	static struct Message dline_msgtab =
284	{
285	.cmd = "DLINE",
286	.args_min = 2,
287	.args_max = MAXPARA,
288	.handlers[UNREGISTERED_HANDLER] = m_unregistered,
289	.handlers[CLIENT_HANDLER] = m_not_oper,
290	.handlers[SERVER_HANDLER] = ms_dline,
291	.handlers[ENCAP_HANDLER] = m_ignore,
292	.handlers[OPER_HANDLER] = mo_dline
293	};
294
295	static void
296	module_init(void)
297	{
298	mod_add_cmd(&dline_msgtab);
299	capab_add("DLN", CAPAB_DLN);
300	}
301
302	static void
303	module_exit(void)
304	{
305	mod_del_cmd(&dline_msgtab);
306	capab_del("DLN");
307	}
308
309	struct module module_entry =
310	{
311	.version = "$Revision$",
312	.modinit = module_init,
313	.modexit = module_exit,
314	};