summaryrefslogtreecommitdiffstats
path: root/nhrpd/nhrp_event.c
blob: e46a6d17cb8a4ad6251671e90d7cc5be05828471 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
/* 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 void 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 void evmgr_read(struct thread *t)
{
	struct event_manager *evmgr = THREAD_ARG(t);
	struct zbuf *ibuf = &evmgr->ibuf;
	struct zbuf msg;

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

	/* 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);
}

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

	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);
	}
}

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

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

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

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

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);
}