[mirror_frr.git] / nhrpd / nhrp_event.c

/* NHRP event manager
 * Copyright (c) 2014-2015 Timo Teräs
 *
 * This file is free software: you may copy, redistribute 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>

#include "thread.h"
#include "zbuf.h"
#include "log.h"
#include "nhrpd.h"

const char *nhrp_event_socket_path;
struct nhrp_reqid_pool nhrp_event_reqid;

struct event_manager {
	struct thread *t_reconnect, *t_read, *t_write;
	struct zbuf ibuf;
	struct zbuf_queue obuf;
	int fd;
	uint8_t ibuf_data[4 * 1024];
};

static int evmgr_reconnect(struct thread *t);

static void evmgr_connection_error(struct event_manager *evmgr)
{
	THREAD_OFF(evmgr->t_read);
	THREAD_OFF(evmgr->t_write);
	zbuf_reset(&evmgr->ibuf);
	zbufq_reset(&evmgr->obuf);

	if (evmgr->fd >= 0)
		close(evmgr->fd);
	evmgr->fd = -1;
	if (nhrp_event_socket_path)
		thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
				      &evmgr->t_reconnect);
}

static void evmgr_recv_message(struct event_manager *evmgr, struct zbuf *zb)
{
	struct zbuf zl;
	uint32_t eventid = 0;
	size_t len;
	char buf[256], result[64] = "";

	while (zbuf_may_pull_until(zb, "\n", &zl)) {
		len = zbuf_used(&zl) - 1;
		if (len >= sizeof(buf) - 1)
			continue;
		memcpy(buf, zbuf_pulln(&zl, len), len);
		buf[len] = 0;

		debugf(NHRP_DEBUG_EVENT, "evmgr: msg: %s", buf);
		if (sscanf(buf, "eventid=%" SCNu32, &eventid) != 1)
			continue;
		if (sscanf(buf, "result=%63s", result) != 1)
			continue;
	}
	debugf(NHRP_DEBUG_EVENT, "evmgr: received: eventid=%d result=%s",
	       eventid, result);
	if (eventid && result[0]) {
		struct nhrp_reqid *r =
			nhrp_reqid_lookup(&nhrp_event_reqid, eventid);
		if (r)
			r->cb(r, result);
	}
}

static int evmgr_read(struct thread *t)
{
	struct event_manager *evmgr = THREAD_ARG(t);
	struct zbuf *ibuf = &evmgr->ibuf;
	struct zbuf msg;

	evmgr->t_read = NULL;
	if (zbuf_read(ibuf, evmgr->fd, (size_t)-1) < 0) {
		evmgr_connection_error(evmgr);
		return 0;
	}

	/* Process all messages in buffer */
	while (zbuf_may_pull_until(ibuf, "\n\n", &msg))
		evmgr_recv_message(evmgr, &msg);

	thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
	return 0;
}

static int evmgr_write(struct thread *t)
{
	struct event_manager *evmgr = THREAD_ARG(t);
	int r;

	evmgr->t_write = NULL;
	r = zbufq_write(&evmgr->obuf, evmgr->fd);
	if (r > 0) {
		thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
				 &evmgr->t_write);
	} else if (r < 0) {
		evmgr_connection_error(evmgr);
	}

	return 0;
}

static void evmgr_hexdump(struct zbuf *zb, const uint8_t *val, size_t vallen)
{
	static const char xd[] = "0123456789abcdef";
	size_t i;
	char *ptr;

	ptr = zbuf_pushn(zb, 2 * vallen);
	if (!ptr)
		return;

	for (i = 0; i < vallen; i++) {
		uint8_t b = val[i];
		*(ptr++) = xd[b >> 4];
		*(ptr++) = xd[b & 0xf];
	}
}

static void evmgr_put(struct zbuf *zb, const char *fmt, ...)
{
	const char *pos, *nxt, *str;
	const uint8_t *bin;
	const union sockunion *su;
	int len;
	va_list va;

	va_start(va, fmt);
	for (pos = fmt; (nxt = strchr(pos, '%')) != NULL; pos = nxt + 2) {
		zbuf_put(zb, pos, nxt - pos);
		switch (nxt[1]) {
		case '%':
			zbuf_put8(zb, '%');
			break;
		case 'u':
			zb->tail +=
				snprintf((char *)zb->tail, zbuf_tailroom(zb),
					 "%u", va_arg(va, uint32_t));
			break;
		case 's':
			str = va_arg(va, const char *);
			zbuf_put(zb, str, strlen(str));
			break;
		case 'U':
			su = va_arg(va, const union sockunion *);
			if (sockunion2str(su, (char *)zb->tail,
					  zbuf_tailroom(zb)))
				zb->tail += strlen((char *)zb->tail);
			else
				zbuf_set_werror(zb);
			break;
		case 'H':
			bin = va_arg(va, const uint8_t *);
			len = va_arg(va, int);
			evmgr_hexdump(zb, bin, len);
			break;
		}
	}
	va_end(va);
	zbuf_put(zb, pos, strlen(pos));
}

static void evmgr_submit(struct event_manager *evmgr, struct zbuf *obuf)
{
	if (obuf->error) {
		zbuf_free(obuf);
		return;
	}
	zbuf_put(obuf, "\n", 1);
	zbufq_queue(&evmgr->obuf, obuf);
	if (evmgr->fd >= 0)
		thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
				 &evmgr->t_write);
}

static int evmgr_reconnect(struct thread *t)
{
	struct event_manager *evmgr = THREAD_ARG(t);
	int fd;

	evmgr->t_reconnect = NULL;
	if (evmgr->fd >= 0 || !nhrp_event_socket_path)
		return 0;

	fd = sock_open_unix(nhrp_event_socket_path);
	if (fd < 0) {
		zlog_warn("%s: failure connecting nhrp-event socket: %s",
			  __PRETTY_FUNCTION__, strerror(errno));
		zbufq_reset(&evmgr->obuf);
		thread_add_timer(master, evmgr_reconnect, evmgr, 10,
				 &evmgr->t_reconnect);
		return 0;
	}

	zlog_info("Connected to Event Manager");
	evmgr->fd = fd;
	thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);

	return 0;
}

static struct event_manager evmgr_connection;

void evmgr_init(void)
{
	struct event_manager *evmgr = &evmgr_connection;

	evmgr->fd = -1;
	zbuf_init(&evmgr->ibuf, evmgr->ibuf_data, sizeof(evmgr->ibuf_data), 0);
	zbufq_init(&evmgr->obuf);
	thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
			      &evmgr->t_reconnect);
}

void evmgr_set_socket(const char *socket)
{
	if (nhrp_event_socket_path) {
		free((char *)nhrp_event_socket_path);
		nhrp_event_socket_path = NULL;
	}
	if (socket)
		nhrp_event_socket_path = strdup(socket);
	evmgr_connection_error(&evmgr_connection);
}

void evmgr_terminate(void)
{
}

void evmgr_notify(const char *name, struct nhrp_cache *c,
		  void (*cb)(struct nhrp_reqid *, void *))
{
	struct event_manager *evmgr = &evmgr_connection;
	struct nhrp_vc *vc;
	struct nhrp_interface *nifp = c->ifp->info;
	struct zbuf *zb;
	afi_t afi = family2afi(sockunion_family(&c->remote_addr));

	if (!nhrp_event_socket_path) {
		cb(&c->eventid, (void *)"accept");
		return;
	}

	debugf(NHRP_DEBUG_EVENT, "evmgr: sending event %s", name);

	vc = c->new.peer ? c->new.peer->vc : NULL;
	zb = zbuf_alloc(
		1024 + (vc ? (vc->local.certlen + vc->remote.certlen) * 2 : 0));

	if (cb) {
		nhrp_reqid_free(&nhrp_event_reqid, &c->eventid);
		evmgr_put(zb, "eventid=%u\n",
			  nhrp_reqid_alloc(&nhrp_event_reqid, &c->eventid, cb));
	}

	evmgr_put(zb,
		  "event=%s\n"
		  "type=%s\n"
		  "old_type=%s\n"
		  "num_nhs=%u\n"
		  "interface=%s\n"
		  "local_addr=%U\n",
		  name, nhrp_cache_type_str[c->new.type],
		  nhrp_cache_type_str[c->cur.type],
		  (unsigned int)nhrp_cache_counts[NHRP_CACHE_NHS], c->ifp->name,
		  &nifp->afi[afi].addr);

	if (vc) {
		evmgr_put(zb,
			  "vc_initiated=%s\n"
			  "local_nbma=%U\n"
			  "local_cert=%H\n"
			  "remote_addr=%U\n"
			  "remote_nbma=%U\n"
			  "remote_cert=%H\n",
			  c->new.peer->requested ? "yes" : "no",
			  &vc->local.nbma, vc->local.cert, vc->local.certlen,
			  &c->remote_addr, &vc->remote.nbma, vc->remote.cert,
			  vc->remote.certlen);
	}

	evmgr_submit(evmgr, zb);
}
Commit	Line	Data
2fb975da TT	1	/* NHRP event manager
	2	* Copyright (c) 2014-2015 Timo Teräs
	3	*
	4	* This file is free software: you may copy, redistribute and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
	8	*/
	9
b45ac5f5 DL	10	#ifdef HAVE_CONFIG_H
	11	#include "config.h"
	12	#endif
	13
2fb975da TT	14	#include <string.h>
	15	#include <sys/socket.h>
	16	#include <sys/un.h>
	17
	18	#include "thread.h"
	19	#include "zbuf.h"
	20	#include "log.h"
	21	#include "nhrpd.h"
	22
	23	const char *nhrp_event_socket_path;
	24	struct nhrp_reqid_pool nhrp_event_reqid;
	25
	26	struct event_manager {
	27	struct thread t_reconnect, t_read, *t_write;
	28	struct zbuf ibuf;
	29	struct zbuf_queue obuf;
	30	int fd;
996c9314	31	uint8_t ibuf_data[4 * 1024];
2fb975da TT	32	};
	33
	34	static int evmgr_reconnect(struct thread *t);
	35
	36	static void evmgr_connection_error(struct event_manager *evmgr)
	37	{
	38	THREAD_OFF(evmgr->t_read);
	39	THREAD_OFF(evmgr->t_write);
	40	zbuf_reset(&evmgr->ibuf);
	41	zbufq_reset(&evmgr->obuf);
	42
	43	if (evmgr->fd >= 0)
	44	close(evmgr->fd);
	45	evmgr->fd = -1;
	46	if (nhrp_event_socket_path)
ffa2c898 QY	47	thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
ffa2c898 QY	48	&evmgr->t_reconnect);
2fb975da TT	49	}
	50
	51	static void evmgr_recv_message(struct event_manager evmgr, struct zbuf zb)
	52	{
	53	struct zbuf zl;
	54	uint32_t eventid = 0;
	55	size_t len;
	56	char buf[256], result[64] = "";
	57
	58	while (zbuf_may_pull_until(zb, "\n", &zl)) {
	59	len = zbuf_used(&zl) - 1;
996c9314	60	if (len >= sizeof(buf) - 1)
2fb975da TT	61	continue;
	62	memcpy(buf, zbuf_pulln(&zl, len), len);
	63	buf[len] = 0;
	64
	65	debugf(NHRP_DEBUG_EVENT, "evmgr: msg: %s", buf);
0651460e	66	if (sscanf(buf, "eventid=%" SCNu32, &eventid) != 1)
6c8ca260 JB	67	continue;
	68	if (sscanf(buf, "result=%63s", result) != 1)
	69	continue;
2fb975da	70	}
996c9314 LB	71	debugf(NHRP_DEBUG_EVENT, "evmgr: received: eventid=%d result=%s",
996c9314 LB	72	eventid, result);
2fb975da	73	if (eventid && result[0]) {
996c9314 LB	74	struct nhrp_reqid *r =
	75	nhrp_reqid_lookup(&nhrp_event_reqid, eventid);
	76	if (r)
	77	r->cb(r, result);
2fb975da TT	78	}
	79	}
	80
	81	static int evmgr_read(struct thread *t)
	82	{
	83	struct event_manager *evmgr = THREAD_ARG(t);
	84	struct zbuf *ibuf = &evmgr->ibuf;
	85	struct zbuf msg;
	86
	87	evmgr->t_read = NULL;
996c9314	88	if (zbuf_read(ibuf, evmgr->fd, (size_t)-1) < 0) {
2fb975da TT	89	evmgr_connection_error(evmgr);
	90	return 0;
	91	}
	92
	93	/* Process all messages in buffer */
	94	while (zbuf_may_pull_until(ibuf, "\n\n", &msg))
	95	evmgr_recv_message(evmgr, &msg);
	96
ffa2c898	97	thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
2fb975da TT	98	return 0;
	99	}
	100
	101	static int evmgr_write(struct thread *t)
	102	{
	103	struct event_manager *evmgr = THREAD_ARG(t);
	104	int r;
	105
	106	evmgr->t_write = NULL;
	107	r = zbufq_write(&evmgr->obuf, evmgr->fd);
	108	if (r > 0) {
ffa2c898 QY	109	thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
ffa2c898 QY	110	&evmgr->t_write);
2fb975da TT	111	} else if (r < 0) {
	112	evmgr_connection_error(evmgr);
	113	}
	114
	115	return 0;
	116	}
	117
	118	static void evmgr_hexdump(struct zbuf zb, const uint8_t val, size_t vallen)
	119	{
	120	static const char xd[] = "0123456789abcdef";
	121	size_t i;
	122	char *ptr;
	123
996c9314 LB	124	ptr = zbuf_pushn(zb, 2 * vallen);
	125	if (!ptr)
	126	return;
2fb975da TT	127
	128	for (i = 0; i < vallen; i++) {
	129	uint8_t b = val[i];
	130	*(ptr++) = xd[b >> 4];
	131	*(ptr++) = xd[b & 0xf];
	132	}
	133	}
	134
	135	static void evmgr_put(struct zbuf zb, const char fmt, ...)
	136	{
	137	const char pos, nxt, *str;
	138	const uint8_t *bin;
	139	const union sockunion *su;
	140	int len;
	141	va_list va;
	142
	143	va_start(va, fmt);
	144	for (pos = fmt; (nxt = strchr(pos, '%')) != NULL; pos = nxt + 2) {
996c9314	145	zbuf_put(zb, pos, nxt - pos);
2fb975da TT	146	switch (nxt[1]) {
	147	case '%':
	148	zbuf_put8(zb, '%');
	149	break;
	150	case 'u':
996c9314 LB	151	zb->tail +=
	152	snprintf((char *)zb->tail, zbuf_tailroom(zb),
	153	"%u", va_arg(va, uint32_t));
2fb975da TT	154	break;
	155	case 's':
	156	str = va_arg(va, const char *);
	157	zbuf_put(zb, str, strlen(str));
	158	break;
	159	case 'U':
	160	su = va_arg(va, const union sockunion *);
996c9314 LB	161	if (sockunion2str(su, (char *)zb->tail,
	162	zbuf_tailroom(zb)))
	163	zb->tail += strlen((char *)zb->tail);
2fb975da TT	164	else
	165	zbuf_set_werror(zb);
	166	break;
	167	case 'H':
	168	bin = va_arg(va, const uint8_t *);
	169	len = va_arg(va, int);
	170	evmgr_hexdump(zb, bin, len);
	171	break;
	172	}
	173	}
	174	va_end(va);
	175	zbuf_put(zb, pos, strlen(pos));
	176	}
	177
	178	static void evmgr_submit(struct event_manager evmgr, struct zbuf obuf)
	179	{
	180	if (obuf->error) {
	181	zbuf_free(obuf);
	182	return;
	183	}
	184	zbuf_put(obuf, "\n", 1);
	185	zbufq_queue(&evmgr->obuf, obuf);
	186	if (evmgr->fd >= 0)
ffa2c898 QY	187	thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
ffa2c898 QY	188	&evmgr->t_write);
2fb975da TT	189	}
	190
	191	static int evmgr_reconnect(struct thread *t)
	192	{
	193	struct event_manager *evmgr = THREAD_ARG(t);
	194	int fd;
	195
	196	evmgr->t_reconnect = NULL;
996c9314 LB	197	if (evmgr->fd >= 0 \|\| !nhrp_event_socket_path)
996c9314 LB	198	return 0;
2fb975da TT	199
	200	fd = sock_open_unix(nhrp_event_socket_path);
	201	if (fd < 0) {
	202	zlog_warn("%s: failure connecting nhrp-event socket: %s",
996c9314	203	__PRETTY_FUNCTION__, strerror(errno));
2fb975da	204	zbufq_reset(&evmgr->obuf);
ffa2c898 QY	205	thread_add_timer(master, evmgr_reconnect, evmgr, 10,
ffa2c898 QY	206	&evmgr->t_reconnect);
2fb975da TT	207	return 0;
	208	}
	209
	210	zlog_info("Connected to Event Manager");
	211	evmgr->fd = fd;
ffa2c898	212	thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
2fb975da TT	213
	214	return 0;
	215	}
	216
	217	static struct event_manager evmgr_connection;
	218
	219	void evmgr_init(void)
	220	{
	221	struct event_manager *evmgr = &evmgr_connection;
	222
	223	evmgr->fd = -1;
	224	zbuf_init(&evmgr->ibuf, evmgr->ibuf_data, sizeof(evmgr->ibuf_data), 0);
	225	zbufq_init(&evmgr->obuf);
ffa2c898 QY	226	thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
ffa2c898 QY	227	&evmgr->t_reconnect);
2fb975da TT	228	}
	229
	230	void evmgr_set_socket(const char *socket)
	231	{
d258c885	232	if (nhrp_event_socket_path) {
996c9314	233	free((char *)nhrp_event_socket_path);
d258c885 DS	234	nhrp_event_socket_path = NULL;
	235	}
	236	if (socket)
	237	nhrp_event_socket_path = strdup(socket);
2fb975da TT	238	evmgr_connection_error(&evmgr_connection);
	239	}
	240
	241	void evmgr_terminate(void)
	242	{
	243	}
	244
996c9314 LB	245	void evmgr_notify(const char name, struct nhrp_cache c,
996c9314 LB	246	void (cb)(struct nhrp_reqid , void *))
2fb975da TT	247	{
	248	struct event_manager *evmgr = &evmgr_connection;
	249	struct nhrp_vc *vc;
	250	struct nhrp_interface *nifp = c->ifp->info;
	251	struct zbuf *zb;
	252	afi_t afi = family2afi(sockunion_family(&c->remote_addr));
	253
	254	if (!nhrp_event_socket_path) {
996c9314	255	cb(&c->eventid, (void *)"accept");
2fb975da TT	256	return;
	257	}
	258
	259	debugf(NHRP_DEBUG_EVENT, "evmgr: sending event %s", name);
	260
	261	vc = c->new.peer ? c->new.peer->vc : NULL;
996c9314 LB	262	zb = zbuf_alloc(
996c9314 LB	263	1024 + (vc ? (vc->local.certlen + vc->remote.certlen) * 2 : 0));
2fb975da TT	264
	265	if (cb) {
	266	nhrp_reqid_free(&nhrp_event_reqid, &c->eventid);
996c9314 LB	267	evmgr_put(zb, "eventid=%u\n",
996c9314 LB	268	nhrp_reqid_alloc(&nhrp_event_reqid, &c->eventid, cb));
2fb975da TT	269	}
	270
	271	evmgr_put(zb,
996c9314 LB	272	"event=%s\n"
	273	"type=%s\n"
	274	"old_type=%s\n"
	275	"num_nhs=%u\n"
	276	"interface=%s\n"
	277	"local_addr=%U\n",
	278	name, nhrp_cache_type_str[c->new.type],
	279	nhrp_cache_type_str[c->cur.type],
	280	(unsigned int)nhrp_cache_counts[NHRP_CACHE_NHS], c->ifp->name,
	281	&nifp->afi[afi].addr);
2fb975da TT	282
	283	if (vc) {
	284	evmgr_put(zb,
996c9314 LB	285	"vc_initiated=%s\n"
	286	"local_nbma=%U\n"
	287	"local_cert=%H\n"
	288	"remote_addr=%U\n"
	289	"remote_nbma=%U\n"
	290	"remote_cert=%H\n",
	291	c->new.peer->requested ? "yes" : "no",
	292	&vc->local.nbma, vc->local.cert, vc->local.certlen,
	293	&c->remote_addr, &vc->remote.nbma, vc->remote.cert,
	294	vc->remote.certlen);
2fb975da TT	295	}
	296
	297	evmgr_submit(evmgr, zb);
	298	}