evt.c revision 1.5.16.1 
1/*	$NetBSD: evt.c,v 1.5.16.1 2008/03/24 07:14:29 keiichi 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 "gcmalloc.h"
52#include "evt.h"
53
54#ifdef ENABLE_ADMINPORT
55
56static EVT_LISTENER_LIST(evt_listeners);
57static EVT_LISTENER_LIST(evt_fds);
58
59struct evt_message {
60	struct admin_com adm;
61	struct evt_async evt;
62};
63
64struct evt {
65	struct evtdump *dump;
66	TAILQ_ENTRY(evt) next;
67};
68
69TAILQ_HEAD(evtlist, evt);
70
71#define EVTLIST_MAX	32
72
73static struct evtlist evtlist = TAILQ_HEAD_INITIALIZER(evtlist);
74static int evtlist_len = 0;
75static int evtlist_inuse = 0;
76
77static struct {
78	int newtype, oldtype;
79} evttype_map[] = {
80	{ EVT_RACOON_QUIT,		EVTT_RACOON_QUIT },
81	{ EVT_PHASE1_UP,		EVTT_PHASE1_UP },
82	{ EVT_PHASE1_DOWN,		EVTT_PHASE1_DOWN },
83	{ EVT_PHASE1_NO_RESPONSE,	EVTT_PEER_NO_RESPONSE },
84	{ EVT_PHASE1_NO_PROPOSAL,	EVTT_PEERPH1_NOPROP },
85	{ EVT_PHASE1_AUTH_FAILED,	EVTT_PEERPH1AUTH_FAILED },
86	{ EVT_PHASE1_DPD_TIMEOUT,	EVTT_DPD_TIMEOUT },
87	{ EVT_PHASE1_PEER_DELETED,	EVTT_PEER_DELETE },
88	{ EVT_PHASE1_MODE_CFG,		EVTT_ISAKMP_CFG_DONE },
89	{ EVT_PHASE1_XAUTH_SUCCESS,	EVTT_XAUTH_SUCCESS },
90	{ EVT_PHASE1_XAUTH_FAILED,	EVTT_XAUTH_FAILED },
91	{ EVT_PHASE2_NO_PHASE1,		-1 },
92	{ EVT_PHASE2_UP,		EVTT_PHASE2_UP },
93	{ EVT_PHASE2_DOWN,		EVTT_PHASE2_DOWN },
94	{ EVT_PHASE2_NO_RESPONSE,	EVTT_PEER_NO_RESPONSE },
95};
96
97static void
98evt_push(src, dst, type, optdata)
99	struct sockaddr *src;
100	struct sockaddr *dst;
101	int type;
102	vchar_t *optdata;
103{
104	struct evtdump *evtdump;
105	struct evt *evt;
106	size_t len;
107	int i;
108
109	/* If admin socket is disabled, silently discard anything */
110	if (adminsock_path == NULL || !evtlist_inuse)
111		return;
112
113	/* Map the event type to old */
114	for (i = 0; i < sizeof(evttype_map) / sizeof(evttype_map[0]); i++)
115		if (evttype_map[i].newtype == type)
116			break;
117	if (i >= sizeof(evttype_map) / sizeof(evttype_map[0]))
118		return;
119
120	type = evttype_map[i].oldtype;
121	if (type < 0)
122		return;
123
124	/* If we are above the limit, don't record anything */
125	if (evtlist_len > EVTLIST_MAX) {
126		plog(LLV_DEBUG, LOCATION, NULL,
127		    "Cannot record event: event queue overflowed\n");
128		return;
129	}
130
131	/* If we hit the limit, record an overflow event instead */
132	if (evtlist_len == EVTLIST_MAX) {
133		plog(LLV_ERROR, LOCATION, NULL,
134		    "Cannot record event: event queue overflow\n");
135		src = NULL;
136		dst = NULL;
137		type = EVTT_OVERFLOW;
138		optdata = NULL;
139	}
140
141	len = sizeof(*evtdump);
142	if (optdata)
143		len += optdata->l;
144
145	if ((evtdump = racoon_malloc(len)) == NULL) {
146		plog(LLV_ERROR, LOCATION, NULL, "Cannot record event: %s\n",
147		    strerror(errno));
148		return;
149	}
150
151	if ((evt = racoon_malloc(sizeof(*evt))) == NULL) {
152		plog(LLV_ERROR, LOCATION, NULL, "Cannot record event: %s\n",
153		    strerror(errno));
154		racoon_free(evtdump);
155		return;
156	}
157
158	if (src)
159		memcpy(&evtdump->src, src, sysdep_sa_len(src));
160	if (dst)
161		memcpy(&evtdump->dst, dst, sysdep_sa_len(dst));
162	evtdump->len = len;
163	evtdump->type = type;
164	time(&evtdump->timestamp);
165
166	if (optdata)
167		memcpy(evtdump + 1, optdata->v, optdata->l);
168
169	evt->dump = evtdump;
170	TAILQ_INSERT_TAIL(&evtlist, evt, next);
171
172	evtlist_len++;
173
174	return;
175}
176
177static struct evtdump *
178evt_pop(void) {
179	struct evtdump *evtdump;
180	struct evt *evt;
181
182	if ((evt = TAILQ_FIRST(&evtlist)) == NULL)
183		return NULL;
184
185	evtdump = evt->dump;
186	TAILQ_REMOVE(&evtlist, evt, next);
187	racoon_free(evt);
188	evtlist_len--;
189
190	return evtdump;
191}
192
193vchar_t *
194evt_dump(void) {
195	struct evtdump *evtdump;
196	vchar_t *buf = NULL;
197
198	if (!evtlist_inuse) {
199		evtlist_inuse = 1;
200		plog(LLV_ERROR, LOCATION, NULL,
201		     "evt_dump: deprecated event polling used\n");
202	}
203
204	if ((evtdump = evt_pop()) != NULL) {
205		if ((buf = vmalloc(evtdump->len)) == NULL) {
206			plog(LLV_ERROR, LOCATION, NULL,
207			    "evt_dump failed: %s\n", strerror(errno));
208			return NULL;
209		}
210		memcpy(buf->v, evtdump, evtdump->len);
211		racoon_free(evtdump);
212	}
213
214	return buf;
215}
216
217static struct evt_message *
218evtmsg_create(type, optdata)
219	int type;
220	vchar_t *optdata;
221{
222	struct evt_message *e;
223	size_t len;
224
225	len = sizeof(struct evt_message);
226	if (optdata != NULL)
227		len += optdata->l;
228
229	if ((e = racoon_malloc(len)) == NULL) {
230		plog(LLV_ERROR, LOCATION, NULL, "Cannot allocate event: %s\n",
231		     strerror(errno));
232		return NULL;
233	}
234
235	memset(e, 0, sizeof(struct evt_message));
236	e->adm.ac_len = len;
237	e->adm.ac_cmd = ADMIN_SHOW_EVT;
238	e->adm.ac_errno = 0;
239	e->adm.ac_proto = 0;
240	e->evt.ec_type = type;
241	time(&e->evt.ec_timestamp);
242	if (optdata != NULL)
243		memcpy(e + 1, optdata->v, optdata->l);
244
245	return e;
246}
247
248static void
249evt_unsubscribe(l)
250	struct evt_listener *l;
251{
252	plog(LLV_DEBUG, LOCATION, NULL,
253	     "[%d] admin connection released\n", l->fd);
254
255	LIST_REMOVE(l, ll_chain);
256	LIST_REMOVE(l, fd_chain);
257	close(l->fd);
258	racoon_free(l);
259}
260
261static void
262evtmsg_broadcast(ll, e)
263	const struct evt_listener_list *ll;
264	struct evt_message *e;
265{
266	struct evt_listener *l, *nl;
267
268	for (l = LIST_FIRST(ll); l != NULL; l = nl) {
269		nl = LIST_NEXT(l, ll_chain);
270
271		if (send(l->fd, e, e->adm.ac_len,
272			 MSG_NOSIGNAL | MSG_DONTWAIT) < 0) {
273			plog(LLV_DEBUG, LOCATION, NULL, "Cannot send event to fd: %s\n",
274				strerror(errno));
275			evt_unsubscribe(l);
276		}
277	}
278}
279
280void
281evt_generic(type, optdata)
282	int type;
283	vchar_t *optdata;
284{
285	struct evt_message *e;
286
287	if ((e = evtmsg_create(type, optdata)) == NULL)
288		return;
289
290	evtmsg_broadcast(&evt_listeners, e);
291	evt_push(&e->evt.ec_ph1src, &e->evt.ec_ph1dst, type, optdata);
292
293	racoon_free(e);
294}
295
296void
297evt_phase1(ph1, type, optdata)
298	const struct ph1handle *ph1;
299	int type;
300	vchar_t *optdata;
301{
302	struct evt_message *e;
303
304	if ((e = evtmsg_create(type, optdata)) == NULL)
305		return;
306
307	if (ph1->local)
308		memcpy(&e->evt.ec_ph1src, ph1->local, sysdep_sa_len(ph1->local));
309	if (ph1->remote)
310		memcpy(&e->evt.ec_ph1dst, ph1->remote, sysdep_sa_len(ph1->remote));
311
312	evtmsg_broadcast(&ph1->evt_listeners, e);
313	evtmsg_broadcast(&evt_listeners, e);
314	evt_push(&e->evt.ec_ph1src, &e->evt.ec_ph1dst, type, optdata);
315
316	racoon_free(e);
317}
318
319void
320evt_phase2(ph2, type, optdata)
321	const struct ph2handle *ph2;
322	int type;
323	vchar_t *optdata;
324{
325	struct evt_message *e;
326	struct ph1handle *ph1 = ph2->ph1;
327
328	if ((e = evtmsg_create(type, optdata)) == NULL)
329		return;
330
331	if (ph1) {
332		if (ph1->local)
333			memcpy(&e->evt.ec_ph1src, ph1->local, sysdep_sa_len(ph1->local));
334		if (ph1->remote)
335			memcpy(&e->evt.ec_ph1dst, ph1->remote, sysdep_sa_len(ph1->remote));
336	}
337	e->evt.ec_ph2msgid = ph2->msgid;
338
339	evtmsg_broadcast(&ph2->evt_listeners, e);
340	if (ph1)
341		evtmsg_broadcast(&ph1->evt_listeners, e);
342	evtmsg_broadcast(&evt_listeners, e);
343	evt_push(&e->evt.ec_ph1src, &e->evt.ec_ph1dst, type, optdata);
344
345	racoon_free(e);
346}
347
348int
349evt_subscribe(list, fd)
350	struct evt_listener_list *list;
351	int fd;
352{
353	struct evt_listener *l;
354
355	if ((l = racoon_malloc(sizeof(*l))) == NULL) {
356		plog(LLV_ERROR, LOCATION, NULL,
357		     "Cannot allocate event listener: %s\n",
358		     strerror(errno));
359		return errno;
360	}
361
362	if (list == NULL)
363		list = &evt_listeners;
364
365	LIST_INSERT_HEAD(list, l, ll_chain);
366	LIST_INSERT_HEAD(&evt_fds, l, fd_chain);
367	l->fd = fd;
368
369	plog(LLV_DEBUG, LOCATION, NULL,
370	     "[%d] admin connection is polling events\n", fd);
371
372	return -2;
373}
374
375void
376evt_list_init(list)
377	struct evt_listener_list *list;
378{
379	LIST_INIT(list);
380}
381
382void
383evt_list_cleanup(list)
384	struct evt_listener_list *list;
385{
386	while (!LIST_EMPTY(list))
387		evt_unsubscribe(LIST_FIRST(list));
388}
389
390int
391evt_get_fdmask(nfds, fdset)
392	int nfds;
393	fd_set *fdset;
394{
395	struct evt_listener *l;
396
397	LIST_FOREACH(l, &evt_fds, fd_chain) {
398		FD_SET(l->fd, fdset);
399		if (l->fd + 1 > nfds)
400			nfds = l->fd + 1;
401	}
402
403	return nfds;
404}
405
406void
407evt_handle_fdmask(fdset)
408	fd_set *fdset;
409{
410	struct evt_listener *l, *nl;
411
412	for (l = LIST_FIRST(&evt_fds); l != NULL; l = nl) {
413		nl = LIST_NEXT(l, ll_chain);
414
415		if (FD_ISSET(l->fd, fdset))
416			evt_unsubscribe(l);
417	}
418}
419
420
421#endif /* ENABLE_ADMINPORT */
422