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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, |
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", |
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, |
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, |
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) |
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, |
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, |
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, |
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( |
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", |
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 | } |