trunk/modules/m_dline.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2021 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_list *tab[] = { &local_client_list, &unknown_list, NULL };

  for (dlink_list **list = tab; *list; ++list)
  {
    dlink_node *node, *node_next;

    DLINK_FOREACH_SAFE(node, node_next, (*list)->head)
    {
      struct Client *client = node->data;

      if (IsDead(client))
        continue;

      switch (arec->masktype)
      {
        case HM_IPV6:
        case HM_IPV4:
          if (address_compare(&client->ip, &arec->Mask.ipa.addr, false, false, arec->Mask.ipa.bits) == true)
            conf_try_ban(client, CLIENT_BAN_DLINE, arec->conf->reason);
          break;
        default:
          assert(0);
      }
    }
  }
}

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

  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;
      }

      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;
      }

      break;
    default:  /* HM_HOST */
      if (IsClient(source_p))
        sendto_one_notice(source_p, &me, ":Invalid D-Line");

     return;
  }

  struct MaskItem *conf;
  if ((conf = find_conf_by_address(NULL, &addr, CONF_DLINE, 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 = event_base->time.sec_real;
  SetConfDatabase(conf);

  if (aline->duration)
  {
    conf->until = event_base->time.sec_real + 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 void
mo_dline(struct Client *source_p, int parc, char *parv[])
{
  struct aline_ctx aline = { .add = true, .simple_mask = false };

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

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

  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;
  }
  else
    cluster_distribute(source_p, "DLINE", CAPAB_DLN, CLUSTER_DLINE,
                       "%ju %s :%s", aline.duration, aline.host, aline.reason);

  dline_handle(source_p, &aline);
}

/*! \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 void
ms_dline(struct Client *source_p, int parc, char *parv[])
{
  struct aline_ctx aline =
  {
    .add = true,
    .simple_mask = false,
    .host = parv[3],
    .reason = parv[4],
    .server = parv[1],
    .duration = strtoumax(parv[2], NULL, 10)
  };

  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;

  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);
}

static struct Message dline_msgtab =
{
  .cmd = "DLINE",
  .handlers[UNREGISTERED_HANDLER] = { .handler = m_unregistered },
  .handlers[CLIENT_HANDLER] = { .handler = m_not_oper },
  .handlers[SERVER_HANDLER] = { .handler = ms_dline, .args_min = 5 },
  .handlers[ENCAP_HANDLER] = { .handler = m_ignore },
  .handlers[OPER_HANDLER] = { .handler = mo_dline, .args_min = 2 }
};

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:	9857
Committed:	Fri Jan 1 04:43:22 2021 UTC (5 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	8036 byte(s)
Log Message:	- Bump copyright years
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 1997-2021 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_list *tab[] = { &local_client_list, &unknown_list, NULL };
50
51	for (dlink_list *list = tab; list; ++list)
52	{
53	dlink_node node, node_next;
54
55	DLINK_FOREACH_SAFE(node, node_next, (*list)->head)
56	{
57	struct Client *client = node->data;
58
59	if (IsDead(client))
60	continue;
61
62	switch (arec->masktype)
63	{
64	case HM_IPV6:
65	case HM_IPV4:
66	if (address_compare(&client->ip, &arec->Mask.ipa.addr, false, false, arec->Mask.ipa.bits) == true)
67	conf_try_ban(client, CLIENT_BAN_DLINE, arec->conf->reason);
68	break;
69	default:
70	assert(0);
71	}
72	}
73	}
74	}
75
76	/* dline_add()
77	*
78	* inputs -
79	* output - NONE
80	* side effects - dline as given is placed
81	*/
82	static void
83	dline_handle(struct Client source_p, const struct aline_ctx aline)
84	{
85	char buf[IRCD_BUFSIZE];
86	struct irc_ssaddr addr;
87	int bits = 0;
88
89	switch (parse_netmask(aline->host, &addr, &bits))
90	{
91	case HM_IPV4:
92	if (!HasFlag(source_p, FLAGS_SERVICE) && (unsigned int)bits < ConfigGeneral.dline_min_cidr)
93	{
94	if (IsClient(source_p))
95	sendto_one_notice(source_p, &me, ":For safety, bitmasks less than %u require conf access.",
96	ConfigGeneral.dline_min_cidr);
97	return;
98	}
99
100	break;
101	case HM_IPV6:
102	if (!HasFlag(source_p, FLAGS_SERVICE) && (unsigned int)bits < ConfigGeneral.dline_min_cidr6)
103	{
104	if (IsClient(source_p))
105	sendto_one_notice(source_p, &me, ":For safety, bitmasks less than %u require conf access.",
106	ConfigGeneral.dline_min_cidr6);
107	return;
108	}
109
110	break;
111	default: /* HM_HOST */
112	if (IsClient(source_p))
113	sendto_one_notice(source_p, &me, ":Invalid D-Line");
114
115	return;
116	}
117
118	struct MaskItem *conf;
119	if ((conf = find_conf_by_address(NULL, &addr, CONF_DLINE, NULL, NULL, 1)))
120	{
121	if (IsClient(source_p))
122	sendto_one_notice(source_p, &me, ":[%s] already D-lined by [%s] - %s",
123	aline->host, conf->host, conf->reason);
124	return;
125	}
126
127	if (aline->duration)
128	snprintf(buf, sizeof(buf), "Temporary D-line %ju min. - %.*s (%s)",
129	aline->duration / 60, REASONLEN, aline->reason, date_iso8601(0));
130	else
131	snprintf(buf, sizeof(buf), "%.*s (%s)", REASONLEN, aline->reason, date_iso8601(0));
132
133	conf = conf_make(CONF_DLINE);
134	conf->host = xstrdup(aline->host);
135	conf->reason = xstrdup(buf);
136	conf->setat = event_base->time.sec_real;
137	SetConfDatabase(conf);
138
139	if (aline->duration)
140	{
141	conf->until = event_base->time.sec_real + aline->duration;
142
143	if (IsClient(source_p))
144	sendto_one_notice(source_p, &me, ":Added temporary %ju min. D-Line [%s]",
145	aline->duration / 60, conf->host);
146
147	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
148	"%s added temporary %ju min. D-Line for [%s] [%s]",
149	get_oper_name(source_p), aline->duration / 60,
150	conf->host, conf->reason);
151	ilog(LOG_TYPE_DLINE, "%s added temporary %ju min. D-Line for [%s] [%s]",
152	get_oper_name(source_p), aline->duration / 60, conf->host, conf->reason);
153	}
154	else
155	{
156	if (IsClient(source_p))
157	sendto_one_notice(source_p, &me, ":Added D-Line [%s]", conf->host);
158
159	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
160	"%s added D-Line for [%s] [%s]",
161	get_oper_name(source_p), conf->host, conf->reason);
162	ilog(LOG_TYPE_DLINE, "%s added D-Line for [%s] [%s]",
163	get_oper_name(source_p), conf->host, conf->reason);
164	}
165
166	dline_check(add_conf_by_address(CONF_DLINE, conf));
167	}
168
169	/* mo_dline()
170	*
171	* inputs - pointer to server
172	* - pointer to client
173	* - parameter count
174	* - parameter list
175	* output -
176	* side effects - D line is added
177	*
178	*/
179	static void
180	mo_dline(struct Client source_p, int parc, char parv[])
181	{
182	struct aline_ctx aline = { .add = true, .simple_mask = false };
183
184	if (!HasOFlag(source_p, OPER_FLAG_DLINE))
185	{
186	sendto_one_numeric(source_p, &me, ERR_NOPRIVS, "dline");
187	return;
188	}
189
190	if (parse_aline("DLINE", source_p, parc, parv, &aline) == false)
191	return;
192
193	if (aline.server)
194	{
195	sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
196	aline.server, aline.duration, aline.host, aline.reason);
197
198	/* Allow ON to apply local dline as well if it matches */
199	if (match(aline.server, me.name))
200	return;
201	}
202	else
203	cluster_distribute(source_p, "DLINE", CAPAB_DLN, CLUSTER_DLINE,
204	"%ju %s :%s", aline.duration, aline.host, aline.reason);
205
206	dline_handle(source_p, &aline);
207	}
208
209	/*! \brief DLINE command handler
210	*
211	* \param source_p Pointer to allocated Client struct from which the message
212	* originally comes from. This can be a local or remote client.
213	* \param parc Integer holding the number of supplied arguments.
214	* \param parv Argument vector where parv[0] .. parv[parc-1] are non-NULL
215	* pointers.
216	* \note Valid arguments for this command are:
217	* - parv[0] = command
218	* - parv[1] = target server mask
219	* - parv[2] = duration in seconds
220	* - parv[3] = IP address
221	* - parv[4] = reason
222	*/
223	static void
224	ms_dline(struct Client source_p, int parc, char parv[])
225	{
226	struct aline_ctx aline =
227	{
228	.add = true,
229	.simple_mask = false,
230	.host = parv[3],
231	.reason = parv[4],
232	.server = parv[1],
233	.duration = strtoumax(parv[2], NULL, 10)
234	};
235
236	sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
237	aline.server, aline.duration, aline.host, aline.reason);
238
239	if (match(aline.server, me.name))
240	return;
241
242	if (HasFlag(source_p, FLAGS_SERVICE) \|\|
243	shared_find(SHARED_DLINE, source_p->servptr->name,
244	source_p->username, source_p->host))
245	dline_handle(source_p, &aline);
246	}
247
248	static struct Message dline_msgtab =
249	{
250	.cmd = "DLINE",
251	.handlers[UNREGISTERED_HANDLER] = { .handler = m_unregistered },
252	.handlers[CLIENT_HANDLER] = { .handler = m_not_oper },
253	.handlers[SERVER_HANDLER] = { .handler = ms_dline, .args_min = 5 },
254	.handlers[ENCAP_HANDLER] = { .handler = m_ignore },
255	.handlers[OPER_HANDLER] = { .handler = mo_dline, .args_min = 2 }
256	};
257
258	static void
259	module_init(void)
260	{
261	mod_add_cmd(&dline_msgtab);
262	capab_add("DLN", CAPAB_DLN);
263	}
264
265	static void
266	module_exit(void)
267	{
268	mod_del_cmd(&dline_msgtab);
269	capab_del("DLN");
270	}
271
272	struct module module_entry =
273	{
274	.version = "$Revision$",
275	.modinit = module_init,
276	.modexit = module_exit,
277	};