evt.c revision 1.9 
1/*	$NetBSD: evt.c,v 1.9 2009/01/23 08:05:58 tteras Exp $	*/
2
3/* Id: evt.c,v 1.5 2006/06/22 20:11:35 manubsd Exp */
4
5/*
6 * Copyright (C) 2004 Emmanuel Dreyfus
7 * Copyright (C) 2008 Timo Teras
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "config.h"
36
37#include <errno.h>
38#include <string.h>
39#include <stdio.h>
40#include <time.h>
41#include <unistd.h>
42#include <stdlib.h>
43#include <sys/queue.h>
44#include <sys/socket.h>
45
46#include "vmbuf.h"
47#include "plog.h"
48#include "misc.h"
49#include "admin.h"
50#include "handler.h"
51#include "session.h"
52#include "gcmalloc.h"
53#include "evt.h"
54#include "var.h"
55
56#ifdef ENABLE_ADMINPORT
57
58static EVT_LISTENER_LIST(evt_listeners);
59
60struct evt_message {
61	struct admin_com adm;
62	struct evt_async evt;
63};
64
65struct evt {
66	struct evtdump *dump;
67	TAILQ_ENTRY(evt) next;
68};
69
70TAILQ_HEAD(evtlist, evt);
71
72#define EVTLIST_MAX	32
73
74static struct evtlist evtlist = TAILQ_HEAD_INITIALIZER(evtlist);
75static int evtlist_len = 0;
76static int evtlist_inuse = 0;
77
78static struct {
79	int newtype, oldtype;
80} evttype_map[] = {
81	{ EVT_RACOON_QUIT,		EVTT_RACOON_QUIT },
82	{ EVT_PHASE1_UP,		EVTT_PHASE1_UP },
83	{ EVT_PHASE1_DOWN,		EVTT_PHASE1_DOWN },
84	{ EVT_PHASE1_NO_RESPONSE,	EVTT_PEER_NO_RESPONSE },
85	{ EVT_PHASE1_NO_PROPOSAL,	EVTT_PEERPH1_NOPROP },
86	{ EVT_PHASE1_AUTH_FAILED,	EVTT_PEERPH1AUTH_FAILED },
87	{ EVT_PHASE1_DPD_TIMEOUT,	EVTT_DPD_TIMEOUT },
88	{ EVT_PHASE1_PEER_DELETED,	EVTT_PEER_DELETE },
89	{ EVT_PHASE1_MODE_CFG,		EVTT_ISAKMP_CFG_DONE },
90	{ EVT_PHASE1_XAUTH_SUCCESS,	EVTT_XAUTH_SUCCESS },
91	{ EVT_PHASE1_XAUTH_FAILED,	EVTT_XAUTH_FAILED },
92	{ EVT_PHASE2_NO_PHASE1,		-1 },
93	{ EVT_PHASE2_UP,		EVTT_PHASE2_UP },
94	{ EVT_PHASE2_DOWN,		EVTT_PHASE2_DOWN },
95	{ EVT_PHASE2_NO_RESPONSE,	EVTT_PEER_NO_RESPONSE },
96};
97
98static void
99evt_push(src, dst, type, optdata)
100	struct sockaddr *src;
101	struct sockaddr *dst;
102	int type;
103	vchar_t *optdata;
104{
105	struct evtdump *evtdump;
106	struct evt *evt;
107	size_t len;
108	int i;
109
110	/* If admin socket is disabled, silently discard anything */
111	if (adminsock_path == NULL || !evtlist_inuse)
112		return;
113
114	/* Map the event type to old */
115	for (i = 0; i < sizeof(evttype_map) / sizeof(evttype_map[0]); i++)
116		if (evttype_map[i].newtype == type)
117			break;
118	if (i >= sizeof(evttype_map) / sizeof(evttype_map[0]))
119		return;
120
121	type = evttype_map[i].oldtype;
122	if (type < 0)
123		return;
124
125	/* If we are above the limit, don't record anything */
126	if (evtlist_len > EVTLIST_MAX) {
127		plog(LLV_DEBUG, LOCATION, NULL,
128		    "Cannot record event: event queue overflowed\n");
129		return;
130	}
131
132	/* If we hit the limit, record an overflow event instead */
133	if (evtlist_len == EVTLIST_MAX) {
134		plog(LLV_ERROR, LOCATION, NULL,
135		    "Cannot record event: event queue overflow\n");
136		src = NULL;
137		dst = NULL;
138		type = EVTT_OVERFLOW;
139		optdata = NULL;
140	}
141
142	len = sizeof(*evtdump);
143	if (optdata)
144		len += optdata->l;
145
146	if ((evtdump = racoon_malloc(len)) == NULL) {
147		plog(LLV_ERROR, LOCATION, NULL, "Cannot record event: %s\n",
148		    strerror(errno));
149		return;
150	}
151
152	if ((evt = racoon_malloc(sizeof(*evt))) == NULL) {
153		plog(LLV_ERROR, LOCATION, NULL, "Cannot record event: %s\n",
154		    strerror(errno));
155		racoon_free(evtdump);
156		return;
157	}
158
159	if (src)
160		memcpy(&evtdump->src, src, sysdep_sa_len(src));
161	if (dst)
162		memcpy(&evtdump->dst, dst, sysdep_sa_len(dst));
163	evtdump->len = len;
164	evtdump->type = type;
165	time(&evtdump->timestamp);
166
167	if (optdata)
168		memcpy(evtdump + 1, optdata->v, optdata->l);
169
170	evt->dump = evtdump;
171	TAILQ_INSERT_TAIL(&evtlist, evt, next);
172
173	evtlist_len++;
174
175	return;
176}
177
178static struct evtdump *
179evt_pop(void) {
180	struct evtdump *evtdump;
181	struct evt *evt;
182
183	if ((evt = TAILQ_FIRST(&evtlist)) == NULL)
184		return NULL;
185
186	evtdump = evt->dump;
187	TAILQ_REMOVE(&evtlist, evt, next);
188	racoon_free(evt);
189	evtlist_len--;
190
191	return evtdump;
192}
193
194vchar_t *
195evt_dump(void) {
196	struct evtdump *evtdump;
197	vchar_t *buf = NULL;
198
199	if (!evtlist_inuse) {
200		evtlist_inuse = 1;
201		plog(LLV_ERROR, LOCATION, NULL,
202		     "evt_dump: deprecated event polling used\n");
203	}
204
205	if ((evtdump = evt_pop()) != NULL) {
206		if ((buf = vmalloc(evtdump->len)) == NULL) {
207			plog(LLV_ERROR, LOCATION, NULL,
208			    "evt_dump failed: %s\n", strerror(errno));
209			return NULL;
210		}
211		memcpy(buf->v, evtdump, evtdump->len);
212		racoon_free(evtdump);
213	}
214
215	return buf;
216}
217
218static struct evt_message *
219evtmsg_create(type, optdata)
220	int type;
221	vchar_t *optdata;
222{
223	struct evt_message *e;
224	size_t len;
225
226	len = sizeof(struct evt_message);
227	if (optdata != NULL)
228		len += optdata->l;
229
230	if ((e = racoon_malloc(len)) == NULL) {
231		plog(LLV_ERROR, LOCATION, NULL, "Cannot allocate event: %s\n",
232		     strerror(errno));
233		return NULL;
234	}
235
236	memset(e, 0, sizeof(struct evt_message));
237	e->adm.ac_len = len;
238	e->adm.ac_cmd = ADMIN_SHOW_EVT;
239	e->adm.ac_errno = 0;
240	e->adm.ac_proto = 0;
241	e->evt.ec_type = type;
242	time(&e->evt.ec_timestamp);
243	if (optdata != NULL)
244		memcpy(e + 1, optdata->v, optdata->l);
245
246	return e;
247}
248
249static void
250evt_unsubscribe(l)
251	struct evt_listener *l;
252{
253	plog(LLV_DEBUG, LOCATION, NULL,
254	     "[%d] admin connection released\n", l->fd);
255
256	LIST_REMOVE(l, ll_chain);
257	unmonitor_fd(l->fd);
258	close(l->fd);
259	racoon_free(l);
260}
261
262static int
263evt_unsubscribe_cb(ctx, fd)
264	void *ctx;
265	int fd;
266{
267	evt_unsubscribe((struct evt_listener *) ctx);
268	return 0;
269}
270
271static void
272evtmsg_broadcast(ll, e)
273	const struct evt_listener_list *ll;
274	struct evt_message *e;
275{
276	struct evt_listener *l, *nl;
277
278	for (l = LIST_FIRST(ll); l != NULL; l = nl) {
279		nl = LIST_NEXT(l, ll_chain);
280
281		if (send(l->fd, e, e->adm.ac_len, MSG_DONTWAIT) < 0) {
282			plog(LLV_DEBUG, LOCATION, NULL, "Cannot send event to fd: %s\n",
283				strerror(errno));
284			evt_unsubscribe(l);
285		}
286	}
287}
288
289void
290evt_generic(type, optdata)
291	int type;
292	vchar_t *optdata;
293{
294	struct evt_message *e;
295
296	if ((e = evtmsg_create(type, optdata)) == NULL)
297		return;
298
299	evtmsg_broadcast(&evt_listeners, e);
300	evt_push(&e->evt.ec_ph1src, &e->evt.ec_ph1dst, type, optdata);
301
302	racoon_free(e);
303}
304
305void
306evt_phase1(ph1, type, optdata)
307	const struct ph1handle *ph1;
308	int type;
309	vchar_t *optdata;
310{
311	struct evt_message *e;
312
313	if ((e = evtmsg_create(type, optdata)) == NULL)
314		return;
315
316	if (ph1->local)
317		memcpy(&e->evt.ec_ph1src, ph1->local, sysdep_sa_len(ph1->local));
318	if (ph1->remote)
319		memcpy(&e->evt.ec_ph1dst, ph1->remote, sysdep_sa_len(ph1->remote));
320
321	evtmsg_broadcast(&ph1->evt_listeners, e);
322	evtmsg_broadcast(&evt_listeners, e);
323	evt_push(&e->evt.ec_ph1src, &e->evt.ec_ph1dst, type, optdata);
324
325	racoon_free(e);
326}
327
328void
329evt_phase2(ph2, type, optdata)
330	const struct ph2handle *ph2;
331	int type;
332	vchar_t *optdata;
333{
334	struct evt_message *e;
335	struct ph1handle *ph1 = ph2->ph1;
336
337	if ((e = evtmsg_create(type, optdata)) == NULL)
338		return;
339
340	if (ph1) {
341		if (ph1->local)
342			memcpy(&e->evt.ec_ph1src, ph1->local, sysdep_sa_len(ph1->local));
343		if (ph1->remote)
344			memcpy(&e->evt.ec_ph1dst, ph1->remote, sysdep_sa_len(ph1->remote));
345	}
346	e->evt.ec_ph2msgid = ph2->msgid;
347
348	evtmsg_broadcast(&ph2->evt_listeners, e);
349	if (ph1)
350		evtmsg_broadcast(&ph1->evt_listeners, e);
351	evtmsg_broadcast(&evt_listeners, e);
352	evt_push(&e->evt.ec_ph1src, &e->evt.ec_ph1dst, type, optdata);
353
354	racoon_free(e);
355}
356
357int
358evt_subscribe(list, fd)
359	struct evt_listener_list *list;
360	int fd;
361{
362	struct evt_listener *l;
363
364	if ((l = racoon_malloc(sizeof(*l))) == NULL) {
365		plog(LLV_ERROR, LOCATION, NULL,
366		     "Cannot allocate event listener: %s\n",
367		     strerror(errno));
368		return errno;
369	}
370
371	if (list == NULL)
372		list = &evt_listeners;
373
374	LIST_INSERT_HEAD(list, l, ll_chain);
375	l->fd = fd;
376	monitor_fd(l->fd, evt_unsubscribe_cb, l);
377
378	plog(LLV_DEBUG, LOCATION, NULL,
379	     "[%d] admin connection is polling events\n", fd);
380
381	return -2;
382}
383
384void
385evt_list_init(list)
386	struct evt_listener_list *list;
387{
388	LIST_INIT(list);
389}
390
391void
392evt_list_cleanup(list)
393	struct evt_listener_list *list;
394{
395	while (!LIST_EMPTY(list))
396		evt_unsubscribe(LIST_FIRST(list));
397}
398
399#endif /* ENABLE_ADMINPORT */
400