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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2fb975da TT |
2 | /* NHRP event manager |
3 | * Copyright (c) 2014-2015 Timo Teräs | |
2fb975da TT |
4 | */ |
5 | ||
b45ac5f5 DL |
6 | #ifdef HAVE_CONFIG_H |
7 | #include "config.h" | |
8 | #endif | |
9 | ||
2fb975da TT |
10 | #include <string.h> |
11 | #include <sys/socket.h> | |
12 | #include <sys/un.h> | |
13 | ||
cb37cb33 | 14 | #include "event.h" |
2fb975da TT |
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 { | |
e6685141 | 23 | struct event *t_reconnect, *t_read, *t_write; |
2fb975da TT |
24 | struct zbuf ibuf; |
25 | struct zbuf_queue obuf; | |
26 | int fd; | |
996c9314 | 27 | uint8_t ibuf_data[4 * 1024]; |
2fb975da TT |
28 | }; |
29 | ||
e6685141 | 30 | static void evmgr_reconnect(struct event *t); |
2fb975da TT |
31 | |
32 | static void evmgr_connection_error(struct event_manager *evmgr) | |
33 | { | |
e16d030c DS |
34 | EVENT_OFF(evmgr->t_read); |
35 | EVENT_OFF(evmgr->t_write); | |
2fb975da TT |
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) | |
907a2395 DS |
43 | event_add_timer_msec(master, evmgr_reconnect, evmgr, 10, |
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); | |
f0a717ce | 62 | if (sscanf(buf, "eventid=%" SCNu32, &eventid) == 1) |
6c8ca260 | 63 | continue; |
f0a717ce | 64 | if (sscanf(buf, "result=%63s", result) == 1) |
6c8ca260 | 65 | continue; |
2fb975da | 66 | } |
996c9314 LB |
67 | debugf(NHRP_DEBUG_EVENT, "evmgr: received: eventid=%d result=%s", |
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 | ||
e6685141 | 77 | static void evmgr_read(struct event *t) |
2fb975da | 78 | { |
e16d030c | 79 | struct event_manager *evmgr = EVENT_ARG(t); |
2fb975da TT |
80 | struct zbuf *ibuf = &evmgr->ibuf; |
81 | struct zbuf msg; | |
82 | ||
996c9314 | 83 | if (zbuf_read(ibuf, evmgr->fd, (size_t)-1) < 0) { |
2fb975da | 84 | evmgr_connection_error(evmgr); |
cc9f21da | 85 | return; |
2fb975da TT |
86 | } |
87 | ||
88 | /* Process all messages in buffer */ | |
89 | while (zbuf_may_pull_until(ibuf, "\n\n", &msg)) | |
90 | evmgr_recv_message(evmgr, &msg); | |
91 | ||
907a2395 | 92 | event_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read); |
2fb975da TT |
93 | } |
94 | ||
e6685141 | 95 | static void evmgr_write(struct event *t) |
2fb975da | 96 | { |
e16d030c | 97 | struct event_manager *evmgr = EVENT_ARG(t); |
2fb975da TT |
98 | int r; |
99 | ||
2fb975da TT |
100 | r = zbufq_write(&evmgr->obuf, evmgr->fd); |
101 | if (r > 0) { | |
907a2395 DS |
102 | event_add_write(master, evmgr_write, evmgr, evmgr->fd, |
103 | &evmgr->t_write); | |
2fb975da TT |
104 | } else if (r < 0) { |
105 | evmgr_connection_error(evmgr); | |
106 | } | |
2fb975da TT |
107 | } |
108 | ||
109 | static void evmgr_hexdump(struct zbuf *zb, const uint8_t *val, size_t vallen) | |
110 | { | |
111 | static const char xd[] = "0123456789abcdef"; | |
112 | size_t i; | |
113 | char *ptr; | |
114 | ||
996c9314 LB |
115 | ptr = zbuf_pushn(zb, 2 * vallen); |
116 | if (!ptr) | |
117 | return; | |
2fb975da TT |
118 | |
119 | for (i = 0; i < vallen; i++) { | |
120 | uint8_t b = val[i]; | |
121 | *(ptr++) = xd[b >> 4]; | |
122 | *(ptr++) = xd[b & 0xf]; | |
123 | } | |
124 | } | |
125 | ||
126 | static void evmgr_put(struct zbuf *zb, const char *fmt, ...) | |
127 | { | |
128 | const char *pos, *nxt, *str; | |
129 | const uint8_t *bin; | |
130 | const union sockunion *su; | |
131 | int len; | |
132 | va_list va; | |
133 | ||
134 | va_start(va, fmt); | |
135 | for (pos = fmt; (nxt = strchr(pos, '%')) != NULL; pos = nxt + 2) { | |
996c9314 | 136 | zbuf_put(zb, pos, nxt - pos); |
2fb975da TT |
137 | switch (nxt[1]) { |
138 | case '%': | |
139 | zbuf_put8(zb, '%'); | |
140 | break; | |
141 | case 'u': | |
996c9314 LB |
142 | zb->tail += |
143 | snprintf((char *)zb->tail, zbuf_tailroom(zb), | |
144 | "%u", va_arg(va, uint32_t)); | |
2fb975da TT |
145 | break; |
146 | case 's': | |
147 | str = va_arg(va, const char *); | |
148 | zbuf_put(zb, str, strlen(str)); | |
149 | break; | |
150 | case 'U': | |
151 | su = va_arg(va, const union sockunion *); | |
996c9314 LB |
152 | if (sockunion2str(su, (char *)zb->tail, |
153 | zbuf_tailroom(zb))) | |
154 | zb->tail += strlen((char *)zb->tail); | |
2fb975da TT |
155 | else |
156 | zbuf_set_werror(zb); | |
157 | break; | |
158 | case 'H': | |
159 | bin = va_arg(va, const uint8_t *); | |
160 | len = va_arg(va, int); | |
161 | evmgr_hexdump(zb, bin, len); | |
162 | break; | |
163 | } | |
164 | } | |
165 | va_end(va); | |
166 | zbuf_put(zb, pos, strlen(pos)); | |
167 | } | |
168 | ||
169 | static void evmgr_submit(struct event_manager *evmgr, struct zbuf *obuf) | |
170 | { | |
171 | if (obuf->error) { | |
172 | zbuf_free(obuf); | |
173 | return; | |
174 | } | |
175 | zbuf_put(obuf, "\n", 1); | |
176 | zbufq_queue(&evmgr->obuf, obuf); | |
177 | if (evmgr->fd >= 0) | |
907a2395 DS |
178 | event_add_write(master, evmgr_write, evmgr, evmgr->fd, |
179 | &evmgr->t_write); | |
2fb975da TT |
180 | } |
181 | ||
e6685141 | 182 | static void evmgr_reconnect(struct event *t) |
2fb975da | 183 | { |
e16d030c | 184 | struct event_manager *evmgr = EVENT_ARG(t); |
2fb975da TT |
185 | int fd; |
186 | ||
996c9314 | 187 | if (evmgr->fd >= 0 || !nhrp_event_socket_path) |
cc9f21da | 188 | return; |
2fb975da TT |
189 | |
190 | fd = sock_open_unix(nhrp_event_socket_path); | |
191 | if (fd < 0) { | |
192 | zlog_warn("%s: failure connecting nhrp-event socket: %s", | |
15569c58 | 193 | __func__, strerror(errno)); |
2fb975da | 194 | zbufq_reset(&evmgr->obuf); |
907a2395 DS |
195 | event_add_timer(master, evmgr_reconnect, evmgr, 10, |
196 | &evmgr->t_reconnect); | |
cc9f21da | 197 | return; |
2fb975da TT |
198 | } |
199 | ||
200 | zlog_info("Connected to Event Manager"); | |
201 | evmgr->fd = fd; | |
907a2395 | 202 | event_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read); |
2fb975da TT |
203 | } |
204 | ||
205 | static struct event_manager evmgr_connection; | |
206 | ||
207 | void evmgr_init(void) | |
208 | { | |
209 | struct event_manager *evmgr = &evmgr_connection; | |
210 | ||
211 | evmgr->fd = -1; | |
212 | zbuf_init(&evmgr->ibuf, evmgr->ibuf_data, sizeof(evmgr->ibuf_data), 0); | |
213 | zbufq_init(&evmgr->obuf); | |
907a2395 DS |
214 | event_add_timer_msec(master, evmgr_reconnect, evmgr, 10, |
215 | &evmgr->t_reconnect); | |
2fb975da TT |
216 | } |
217 | ||
218 | void evmgr_set_socket(const char *socket) | |
219 | { | |
d258c885 | 220 | if (nhrp_event_socket_path) { |
996c9314 | 221 | free((char *)nhrp_event_socket_path); |
d258c885 DS |
222 | nhrp_event_socket_path = NULL; |
223 | } | |
224 | if (socket) | |
225 | nhrp_event_socket_path = strdup(socket); | |
2fb975da TT |
226 | evmgr_connection_error(&evmgr_connection); |
227 | } | |
228 | ||
229 | void evmgr_terminate(void) | |
230 | { | |
231 | } | |
232 | ||
996c9314 LB |
233 | void evmgr_notify(const char *name, struct nhrp_cache *c, |
234 | void (*cb)(struct nhrp_reqid *, void *)) | |
2fb975da TT |
235 | { |
236 | struct event_manager *evmgr = &evmgr_connection; | |
237 | struct nhrp_vc *vc; | |
238 | struct nhrp_interface *nifp = c->ifp->info; | |
239 | struct zbuf *zb; | |
240 | afi_t afi = family2afi(sockunion_family(&c->remote_addr)); | |
241 | ||
242 | if (!nhrp_event_socket_path) { | |
996c9314 | 243 | cb(&c->eventid, (void *)"accept"); |
2fb975da TT |
244 | return; |
245 | } | |
246 | ||
247 | debugf(NHRP_DEBUG_EVENT, "evmgr: sending event %s", name); | |
248 | ||
249 | vc = c->new.peer ? c->new.peer->vc : NULL; | |
996c9314 LB |
250 | zb = zbuf_alloc( |
251 | 1024 + (vc ? (vc->local.certlen + vc->remote.certlen) * 2 : 0)); | |
2fb975da TT |
252 | |
253 | if (cb) { | |
254 | nhrp_reqid_free(&nhrp_event_reqid, &c->eventid); | |
996c9314 LB |
255 | evmgr_put(zb, "eventid=%u\n", |
256 | nhrp_reqid_alloc(&nhrp_event_reqid, &c->eventid, cb)); | |
2fb975da TT |
257 | } |
258 | ||
259 | evmgr_put(zb, | |
996c9314 LB |
260 | "event=%s\n" |
261 | "type=%s\n" | |
262 | "old_type=%s\n" | |
263 | "num_nhs=%u\n" | |
264 | "interface=%s\n" | |
265 | "local_addr=%U\n", | |
266 | name, nhrp_cache_type_str[c->new.type], | |
267 | nhrp_cache_type_str[c->cur.type], | |
268 | (unsigned int)nhrp_cache_counts[NHRP_CACHE_NHS], c->ifp->name, | |
269 | &nifp->afi[afi].addr); | |
2fb975da TT |
270 | |
271 | if (vc) { | |
272 | evmgr_put(zb, | |
996c9314 LB |
273 | "vc_initiated=%s\n" |
274 | "local_nbma=%U\n" | |
275 | "local_cert=%H\n" | |
276 | "remote_addr=%U\n" | |
277 | "remote_nbma=%U\n" | |
278 | "remote_cert=%H\n", | |
279 | c->new.peer->requested ? "yes" : "no", | |
280 | &vc->local.nbma, vc->local.cert, vc->local.certlen, | |
281 | &c->remote_addr, &vc->remote.nbma, vc->remote.cert, | |
282 | vc->remote.certlen); | |
2fb975da TT |
283 | } |
284 | ||
285 | evmgr_submit(evmgr, zb); | |
286 | } |