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