[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.
 */

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