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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 | ||
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, |
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); | |
6c8ca260 JB |
62 | if (sscanf(buf, "eventid=%d", &eventid) != 1) |
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", |
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, |
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, |
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) |
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, |
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, |
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, |
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( |
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", |
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 | } |