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1 /* $OpenBSD$ */
2
3 /*
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <zebra.h>
20 #include <sys/un.h>
21
22 #include "ldpd.h"
23 #include "ldpe.h"
24 #include "log.h"
25 #include "control.h"
26
27 #define CONTROL_BACKLOG 5
28
29 static int control_accept(struct thread *);
30 static struct ctl_conn *control_connbyfd(int);
31 static struct ctl_conn *control_connbypid(pid_t);
32 static void control_close(int);
33 static int control_dispatch_imsg(struct thread *);
34
35 struct ctl_conns ctl_conns;
36
37 static int control_fd;
38
39 int
40 control_init(void)
41 {
42 struct sockaddr_un s_un;
43 int fd;
44 mode_t old_umask;
45
46 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
47 log_warn("%s: socket", __func__);
48 return (-1);
49 }
50 sock_set_nonblock(fd);
51
52 memset(&s_un, 0, sizeof(s_un));
53 s_un.sun_family = AF_UNIX;
54 strlcpy(s_un.sun_path, LDPD_SOCKET, sizeof(s_un.sun_path));
55
56 if (unlink(LDPD_SOCKET) == -1)
57 if (errno != ENOENT) {
58 log_warn("%s: unlink %s", __func__, LDPD_SOCKET);
59 close(fd);
60 return (-1);
61 }
62
63 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
64 if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
65 log_warn("%s: bind: %s", __func__, LDPD_SOCKET);
66 close(fd);
67 umask(old_umask);
68 return (-1);
69 }
70 umask(old_umask);
71
72 if (chmod(LDPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
73 log_warn("%s: chmod", __func__);
74 close(fd);
75 (void)unlink(LDPD_SOCKET);
76 return (-1);
77 }
78
79 control_fd = fd;
80
81 return (0);
82 }
83
84 int
85 control_listen(void)
86 {
87 if (listen(control_fd, CONTROL_BACKLOG) == -1) {
88 log_warn("%s: listen", __func__);
89 return (-1);
90 }
91
92 return (accept_add(control_fd, control_accept, NULL));
93 }
94
95 void
96 control_cleanup(void)
97 {
98 accept_del(control_fd);
99 close(control_fd);
100 unlink(LDPD_SOCKET);
101 }
102
103 /* ARGSUSED */
104 static int
105 control_accept(struct thread *thread)
106 {
107 int connfd;
108 socklen_t len;
109 struct sockaddr_un s_un;
110 struct ctl_conn *c;
111
112 len = sizeof(s_un);
113 if ((connfd = accept(THREAD_FD(thread), (struct sockaddr *)&s_un,
114 &len)) == -1) {
115 /*
116 * Pause accept if we are out of file descriptors, or
117 * libevent will haunt us here too.
118 */
119 if (errno == ENFILE || errno == EMFILE)
120 accept_pause();
121 else if (errno != EWOULDBLOCK && errno != EINTR &&
122 errno != ECONNABORTED)
123 log_warn("%s: accept", __func__);
124 return (0);
125 }
126 sock_set_nonblock(connfd);
127
128 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
129 log_warn(__func__);
130 close(connfd);
131 return (0);
132 }
133
134 imsg_init(&c->iev.ibuf, connfd);
135 c->iev.handler_read = control_dispatch_imsg;
136 c->iev.ev_read = thread_add_read(master, c->iev.handler_read,
137 &c->iev, c->iev.ibuf.fd);
138 c->iev.handler_write = ldp_write_handler;
139 c->iev.ev_write = NULL;
140
141 TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
142
143 return (0);
144 }
145
146 static struct ctl_conn *
147 control_connbyfd(int fd)
148 {
149 struct ctl_conn *c;
150
151 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd;
152 c = TAILQ_NEXT(c, entry))
153 ; /* nothing */
154
155 return (c);
156 }
157
158 static struct ctl_conn *
159 control_connbypid(pid_t pid)
160 {
161 struct ctl_conn *c;
162
163 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid;
164 c = TAILQ_NEXT(c, entry))
165 ; /* nothing */
166
167 return (c);
168 }
169
170 static void
171 control_close(int fd)
172 {
173 struct ctl_conn *c;
174
175 if ((c = control_connbyfd(fd)) == NULL) {
176 log_warnx("%s: fd %d: not found", __func__, fd);
177 return;
178 }
179
180 msgbuf_clear(&c->iev.ibuf.w);
181 TAILQ_REMOVE(&ctl_conns, c, entry);
182
183 THREAD_READ_OFF(c->iev.ev_read);
184 THREAD_WRITE_OFF(c->iev.ev_write);
185 close(c->iev.ibuf.fd);
186 accept_unpause();
187 free(c);
188 }
189
190 /* ARGSUSED */
191 static int
192 control_dispatch_imsg(struct thread *thread)
193 {
194 int fd = THREAD_FD(thread);
195 struct ctl_conn *c;
196 struct imsg imsg;
197 ssize_t n;
198 unsigned int ifidx;
199
200 if ((c = control_connbyfd(fd)) == NULL) {
201 log_warnx("%s: fd %d: not found", __func__, fd);
202 return (0);
203 }
204
205 c->iev.ev_read = NULL;
206
207 if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
208 n == 0) {
209 control_close(fd);
210 return (0);
211 }
212
213 for (;;) {
214 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
215 control_close(fd);
216 return (0);
217 }
218
219 if (n == 0)
220 break;
221
222 switch (imsg.hdr.type) {
223 case IMSG_CTL_FIB_COUPLE:
224 case IMSG_CTL_FIB_DECOUPLE:
225 case IMSG_CTL_RELOAD:
226 case IMSG_CTL_KROUTE:
227 case IMSG_CTL_KROUTE_ADDR:
228 case IMSG_CTL_IFINFO:
229 /* ignore */
230 break;
231 case IMSG_CTL_SHOW_INTERFACE:
232 if (imsg.hdr.len == IMSG_HEADER_SIZE +
233 sizeof(ifidx)) {
234 memcpy(&ifidx, imsg.data, sizeof(ifidx));
235 ldpe_iface_ctl(c, ifidx);
236 imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
237 0, -1, NULL, 0);
238 }
239 break;
240 case IMSG_CTL_SHOW_DISCOVERY:
241 ldpe_adj_ctl(c);
242 break;
243 case IMSG_CTL_SHOW_LIB:
244 case IMSG_CTL_SHOW_L2VPN_PW:
245 case IMSG_CTL_SHOW_L2VPN_BINDING:
246 c->iev.ibuf.pid = imsg.hdr.pid;
247 ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
248 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
249 break;
250 case IMSG_CTL_SHOW_NBR:
251 ldpe_nbr_ctl(c);
252 break;
253 case IMSG_CTL_CLEAR_NBR:
254 if (imsg.hdr.len != IMSG_HEADER_SIZE +
255 sizeof(struct ctl_nbr))
256 break;
257
258 nbr_clear_ctl(imsg.data);
259 break;
260 case IMSG_CTL_LOG_VERBOSE:
261 /* ignore */
262 break;
263 default:
264 log_debug("%s: error handling imsg %d", __func__,
265 imsg.hdr.type);
266 break;
267 }
268 imsg_free(&imsg);
269 }
270
271 imsg_event_add(&c->iev);
272
273 return (0);
274 }
275
276 int
277 control_imsg_relay(struct imsg *imsg)
278 {
279 struct ctl_conn *c;
280
281 if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
282 return (0);
283
284 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
285 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
286 }