1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
|
/* $OpenBSD: control.c,v 1.30 2020/06/22 15:09:34 mestre Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "control.h"
#define CONTROL_BACKLOG 5
static void control_accept(int, short, void *);
static struct ctl_conn *control_connbyfd(int);
static struct ctl_conn *control_connbypid(pid_t);
static void control_close(int);
static void control_dispatch_imsg(int, short, void *);
struct ctl_conns ctl_conns;
static int control_fd;
int
control_init(char *path)
{
struct sockaddr_un sun;
int fd;
mode_t old_umask;
if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
0)) == -1) {
log_warn("%s: socket", __func__);
return (-1);
}
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
if (unlink(path) == -1)
if (errno != ENOENT) {
log_warn("%s: unlink %s", __func__, path);
close(fd);
return (-1);
}
old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
log_warn("%s: bind: %s", __func__, path);
close(fd);
umask(old_umask);
return (-1);
}
umask(old_umask);
if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
log_warn("%s: chmod", __func__);
close(fd);
(void)unlink(path);
return (-1);
}
control_fd = fd;
return (0);
}
int
control_listen(void)
{
if (listen(control_fd, CONTROL_BACKLOG) == -1) {
log_warn("%s: listen", __func__);
return (-1);
}
return (accept_add(control_fd, control_accept, NULL));
}
void
control_cleanup(void)
{
accept_del(control_fd);
close(control_fd);
}
/* ARGSUSED */
static void
control_accept(int listenfd, short event, void *bula)
{
int connfd;
socklen_t len;
struct sockaddr_un sun;
struct ctl_conn *c;
len = sizeof(sun);
if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
SOCK_NONBLOCK | SOCK_CLOEXEC)) == -1) {
/*
* Pause accept if we are out of file descriptors, or
* libevent will haunt us here too.
*/
if (errno == ENFILE || errno == EMFILE)
accept_pause();
else if (errno != EWOULDBLOCK && errno != EINTR &&
errno != ECONNABORTED)
log_warn("%s: accept4", __func__);
return;
}
if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
log_warn(__func__);
close(connfd);
return;
}
imsg_init(&c->iev.ibuf, connfd);
c->iev.handler = control_dispatch_imsg;
c->iev.events = EV_READ;
event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
c->iev.handler, &c->iev);
event_add(&c->iev.ev, NULL);
TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
}
static struct ctl_conn *
control_connbyfd(int fd)
{
struct ctl_conn *c;
TAILQ_FOREACH(c, &ctl_conns, entry) {
if (c->iev.ibuf.fd == fd)
break;
}
return (c);
}
static struct ctl_conn *
control_connbypid(pid_t pid)
{
struct ctl_conn *c;
TAILQ_FOREACH(c, &ctl_conns, entry) {
if (c->iev.ibuf.pid == pid)
break;
}
return (c);
}
static void
control_close(int fd)
{
struct ctl_conn *c;
if ((c = control_connbyfd(fd)) == NULL) {
log_warnx("%s: fd %d: not found", __func__, fd);
return;
}
msgbuf_clear(&c->iev.ibuf.w);
TAILQ_REMOVE(&ctl_conns, c, entry);
event_del(&c->iev.ev);
close(c->iev.ibuf.fd);
accept_unpause();
free(c);
}
/* ARGSUSED */
static void
control_dispatch_imsg(int fd, short event, void *bula)
{
struct ctl_conn *c;
struct imsg imsg;
ssize_t n;
unsigned int ifidx;
int verbose;
if ((c = control_connbyfd(fd)) == NULL) {
log_warnx("%s: fd %d: not found", __func__, fd);
return;
}
if (event & EV_READ) {
if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
n == 0) {
control_close(fd);
return;
}
}
if (event & EV_WRITE) {
if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
control_close(fd);
return;
}
}
for (;;) {
if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
control_close(fd);
return;
}
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CTL_FIB_COUPLE:
case IMSG_CTL_FIB_DECOUPLE:
case IMSG_CTL_RELOAD:
c->iev.ibuf.pid = imsg.hdr.pid;
ldpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
break;
case IMSG_CTL_KROUTE:
case IMSG_CTL_KROUTE_ADDR:
case IMSG_CTL_IFINFO:
c->iev.ibuf.pid = imsg.hdr.pid;
ldpe_imsg_compose_parent(imsg.hdr.type,
imsg.hdr.pid, imsg.data,
imsg.hdr.len - IMSG_HEADER_SIZE);
break;
case IMSG_CTL_SHOW_INTERFACE:
if (imsg.hdr.len == IMSG_HEADER_SIZE +
sizeof(ifidx)) {
memcpy(&ifidx, imsg.data, sizeof(ifidx));
ldpe_iface_ctl(c, ifidx);
imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
0, -1, NULL, 0);
}
break;
case IMSG_CTL_SHOW_DISCOVERY:
ldpe_adj_ctl(c);
break;
case IMSG_CTL_SHOW_LIB:
case IMSG_CTL_SHOW_L2VPN_PW:
case IMSG_CTL_SHOW_L2VPN_BINDING:
c->iev.ibuf.pid = imsg.hdr.pid;
ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
break;
case IMSG_CTL_SHOW_NBR:
ldpe_nbr_ctl(c);
break;
case IMSG_CTL_CLEAR_NBR:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct ctl_nbr))
break;
nbr_clear_ctl(imsg.data);
break;
case IMSG_CTL_LOG_VERBOSE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(verbose))
break;
/* forward to other processes */
ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
memcpy(&verbose, imsg.data, sizeof(verbose));
log_verbose(verbose);
break;
default:
log_debug("%s: error handling imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
imsg_event_add(&c->iev);
}
int
control_imsg_relay(struct imsg *imsg)
{
struct ctl_conn *c;
if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
return (0);
return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
-1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
}
|
