8.2.x/modules/m_dline.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2022 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, true);
}

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:	10042
Committed:	Sun May 29 10:56:11 2022 UTC (22 months, 2 weeks ago) by michael
Content type:	text/x-csrc
File size:	8042 byte(s)
Log Message:	- Implemented the owner/admin channel prefix modes. These are optional and can be enabled with the channel::enable_owner and channel::enable_admin configuration directives
#	User	Rev	Content
1	michael	1058	/*
2	michael	2810	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	michael	1058	*
4	michael	10024	* Copyright (c) 1997-2022 ircd-hybrid development team
5	michael	1058	*
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	michael	4564	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	michael	1058	* USA
20			*/
21
22	michael	2810	/*! \file m_dline.c
23	michael	3348	* \brief Includes required functions for processing the DLINE command.
24	michael	2810	* \version $Id$
25			*/
26
27	michael	1058	#include "stdinc.h"
28			#include "list.h"
29			#include "client.h"
30			#include "irc_string.h"
31	michael	1632	#include "conf.h"
32	michael	7208	#include "conf_cluster.h"
33			#include "conf_shared.h"
34	michael	1058	#include "ircd.h"
35			#include "hostmask.h"
36			#include "numeric.h"
37	michael	1309	#include "log.h"
38	michael	3347	#include "misc.h"
39	michael	1058	#include "send.h"
40	michael	8165	#include "server_capab.h"
41	michael	1058	#include "parse.h"
42			#include "modules.h"
43	michael	1666	#include "memory.h"
44	michael	1058
45
46	michael	3930	static void
47	michael	7434	dline_check(const struct AddressRec *arec)
48	michael	3930	{
49	michael	8734	dlink_list *tab[] = { &local_client_list, &unknown_list, NULL };
50	michael	3930
51	michael	8734	for (dlink_list *list = tab; list; ++list)
52	michael	3930	{
53	michael	8736	dlink_node node, node_next;
54
55	michael	8734	DLINK_FOREACH_SAFE(node, node_next, (*list)->head)
56	michael	3930	{
57	michael	9582	struct Client *client = node->data;
58	michael	3930
59	michael	9582	if (IsDead(client))
60	michael	8734	continue;
61	michael	3930
62	michael	8734	switch (arec->masktype)
63			{
64	michael	9595	case HM_IPV6:
65	michael	8734	case HM_IPV4:
66	michael	9607	if (address_compare(&client->ip, &arec->Mask.ipa.addr, false, false, arec->Mask.ipa.bits) == true)
67	michael	9595	conf_try_ban(client, CLIENT_BAN_DLINE, arec->conf->reason);
68	michael	8734	break;
69	michael	9595	default:
70			assert(0);
71	michael	8734	}
72	michael	3930	}
73			}
74			}
75
76	michael	5830	/* dline_add()
77	michael	1058	*
78			* inputs -
79			* output - NONE
80	michael	5830	* side effects - dline as given is placed
81	michael	1058	*/
82			static void
83	michael	8985	dline_handle(struct Client source_p, const struct aline_ctx aline)
84	michael	1058	{
85	michael	5830	char buf[IRCD_BUFSIZE];
86	michael	8669	struct irc_ssaddr addr;
87	michael	8828	int bits = 0;
88	michael	5830
89	michael	8669	switch (parse_netmask(aline->host, &addr, &bits))
90	michael	7418	{
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	michael	8736	if (IsClient(source_p))
113			sendto_one_notice(source_p, &me, ":Invalid D-Line");
114
115	michael	7418	return;
116			}
117
118	michael	8430	struct MaskItem *conf;
119	michael	8828	if ((conf = find_conf_by_address(NULL, &addr, CONF_DLINE, NULL, NULL, 1)))
120	michael	7418	{
121			if (IsClient(source_p))
122			sendto_one_notice(source_p, &me, ":[%s] already D-lined by [%s] - %s",
123	michael	8669	aline->host, conf->host, conf->reason);
124	michael	7418	return;
125			}
126
127	michael	8669	if (aline->duration)
128	michael	6781	snprintf(buf, sizeof(buf), "Temporary D-line %ju min. - %.*s (%s)",
129	michael	8669	aline->duration / 60, REASONLEN, aline->reason, date_iso8601(0));
130	michael	5830	else
131	michael	8669	snprintf(buf, sizeof(buf), "%.*s (%s)", REASONLEN, aline->reason, date_iso8601(0));
132	michael	5830
133	michael	7418	conf = conf_make(CONF_DLINE);
134	michael	8669	conf->host = xstrdup(aline->host);
135	michael	5830	conf->reason = xstrdup(buf);
136	michael	8927	conf->setat = event_base->time.sec_real;
137	michael	5830	SetConfDatabase(conf);
138
139	michael	8669	if (aline->duration)
140	michael	1622	{
141	michael	8927	conf->until = event_base->time.sec_real + aline->duration;
142	michael	4640
143			if (IsClient(source_p))
144	michael	6781	sendto_one_notice(source_p, &me, ":Added temporary %ju min. D-Line [%s]",
145	michael	8669	aline->duration / 60, conf->host);
146	michael	4889
147	michael	6317	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
148	michael	6781	"%s added temporary %ju min. D-Line for [%s] [%s]",
149	michael	8669	get_oper_name(source_p), aline->duration / 60,
150	michael	1632	conf->host, conf->reason);
151	michael	6781	ilog(LOG_TYPE_DLINE, "%s added temporary %ju min. D-Line for [%s] [%s]",
152	michael	8669	get_oper_name(source_p), aline->duration / 60, conf->host, conf->reason);
153	michael	1622	}
154			else
155			{
156	michael	4640	if (IsClient(source_p))
157			sendto_one_notice(source_p, &me, ":Added D-Line [%s]", conf->host);
158
159	michael	6317	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
160	michael	1622	"%s added D-Line for [%s] [%s]",
161	michael	1632	get_oper_name(source_p), conf->host, conf->reason);
162	michael	1622	ilog(LOG_TYPE_DLINE, "%s added D-Line for [%s] [%s]",
163	michael	1632	get_oper_name(source_p), conf->host, conf->reason);
164	michael	1622	}
165
166	michael	5831	dline_check(add_conf_by_address(CONF_DLINE, conf));
167	michael	1058	}
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	michael	9078	static void
180	michael	3156	mo_dline(struct Client source_p, int parc, char parv[])
181	michael	1058	{
182	michael	8679	struct aline_ctx aline = { .add = true, .simple_mask = false };
183	michael	1058
184	michael	1301	if (!HasOFlag(source_p, OPER_FLAG_DLINE))
185	michael	1058	{
186	michael	3109	sendto_one_numeric(source_p, &me, ERR_NOPRIVS, "dline");
187	michael	9078	return;
188	michael	1058	}
189
190	michael	8669	if (parse_aline("DLINE", source_p, parc, parv, &aline) == false)
191	michael	9078	return;
192	michael	1058
193	michael	8669	if (aline.server)
194	michael	1301	{
195	michael	8669	sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
196			aline.server, aline.duration, aline.host, aline.reason);
197	michael	1301
198	michael	6431	/* Allow ON to apply local dline as well if it matches */
199	michael	8669	if (match(aline.server, me.name))
200	michael	9078	return;
201	michael	1301	}
202			else
203	michael	7208	cluster_distribute(source_p, "DLINE", CAPAB_DLN, CLUSTER_DLINE,
204	michael	8669	"%ju %s :%s", aline.duration, aline.host, aline.reason);
205	michael	1301
206	michael	8669	dline_handle(source_p, &aline);
207	michael	1058	}
208
209	michael	7093	/*! \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	michael	9078	static void
224	michael	3156	ms_dline(struct Client source_p, int parc, char parv[])
225	michael	1301	{
226	michael	8669	struct aline_ctx aline =
227			{
228			.add = true,
229	michael	8679	.simple_mask = false,
230	michael	8669	.host = parv[3],
231			.reason = parv[4],
232			.server = parv[1],
233			.duration = strtoumax(parv[2], NULL, 10)
234			};
235	michael	1301
236	michael	8669	sendto_match_servs(source_p, aline.server, CAPAB_DLN, "DLINE %s %ju %s :%s",
237			aline.server, aline.duration, aline.host, aline.reason);
238	michael	1301
239	michael	8669	if (match(aline.server, me.name))
240	michael	9078	return;
241	michael	1301
242	michael	2810	if (HasFlag(source_p, FLAGS_SERVICE) \|\|
243	michael	7208	shared_find(SHARED_DLINE, source_p->servptr->name,
244			source_p->username, source_p->host))
245	michael	8669	dline_handle(source_p, &aline);
246	michael	1301	}
247
248	michael	2810	static struct Message dline_msgtab =
249			{
250	michael	5880	.cmd = "DLINE",
251	michael	9373	.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	michael	1230	};
257
258			static void
259			module_init(void)
260			{
261			mod_add_cmd(&dline_msgtab);
262	michael	10042	capab_add("DLN", CAPAB_DLN, true);
263	michael	1230	}
264
265			static void
266			module_exit(void)
267			{
268			mod_del_cmd(&dline_msgtab);
269	michael	8165	capab_del("DLN");
270	michael	1230	}
271
272	michael	2810	struct module module_entry =
273			{
274	michael	1230	.version = "$Revision$",
275			.modinit = module_init,
276			.modexit = module_exit,
277			};