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
|
#include <stdio.h>
#include <string.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include "log.h"
#include "bfd.h"
// return 0 : success
// return -1 : fail
int bfd_vtysh_connect(struct bfd_vtysh_client *client)
{
int ret;
int sock, len;
struct stat s_stat;
struct sockaddr_un addr;
/* Stat socket to see if we have permission to access it. */
ret = stat(client->path, &s_stat);
if (ret < 0 && errno != ENOENT) {
LOG_DEBUG("bfd vtysh_connect(%s): stat = %s", client->path, strerror(errno));
return -1;
}
if (ret >= 0) {
if (!S_ISSOCK(s_stat.st_mode)) {
LOG_DEBUG("bfd vtysh_connect(%s): Not a socket", client->path);
return -1;
}
}
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
LOG_DEBUG("bfd vtysh_connect(%s): socket = %s", client->path, strerror(errno));
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, client->path, sizeof(addr.sun_path));
len = sizeof(addr.sun_family) + strlen(addr.sun_path);
ret = connect(sock, (struct sockaddr *)&addr, len);
if (ret < 0) {
LOG_DEBUG("bfd vtysh_connect(%s): connect = %s", client->path, strerror(errno));
close(sock);
return -1;
}
client->fd = sock;
if (client->pre_config) {
ret = client->pre_config(client);
if (ret < 0) {
LOG_DEBUG("bfd vtysh_connect(%s) preconfig error: connect = %s", client->path, strerror(errno));
bfd_vtysh_close(client);
return -1;
}
}
if (client->recover_config) {
ret = client->recover_config(client);
if (ret < 0) {
LOG_DEBUG("bfd vtysh_connect(%s) recover config error: connect = %s", client->path, strerror(errno));
bfd_vtysh_close(client);
return -1;
}
}
LOG_DEBUG("bfd vtysh_connect(%d): succ", client->fd);
return 0;
}
void bfd_vtysh_close(struct bfd_vtysh_client *client)
{
if (client->fd > 0) {
close(client->fd);
client->fd = -1;
}
}
static int bfd_vtysh_client_send(struct bfd_vtysh_client *client, const char *line)
{
int ret = 0;
ret = write(client->fd, line, strlen(line) + 1);
if (ret <= 0) {
/* close connection and try to reconnect */
bfd_vtysh_close(client);
ret = bfd_vtysh_connect(client);
if (ret < 0)
return -1;
/* retry line */
ret = write(client->fd, line, strlen(line) + 1);
if (ret <= 0)
return -1;
}
return 0;
}
static ssize_t bfd_vtysh_client_receive(struct bfd_vtysh_client *client, char *buf, size_t bufsz)
{
struct iovec iov[1] = {
{
.iov_base = buf,
.iov_len = bufsz,
},
};
union {
uint8_t buf[CMSG_SPACE(sizeof(int))];
struct cmsghdr align;
} u;
struct msghdr mh;
memset(&mh, 0, sizeof(mh));
mh.msg_iov = iov;
mh.msg_iovlen = 1;
mh.msg_control = u.buf;
mh.msg_controllen = sizeof(u.buf);
struct cmsghdr *cmh = CMSG_FIRSTHDR(&mh);
ssize_t ret;
cmh->cmsg_level = SOL_SOCKET;
cmh->cmsg_type = SCM_RIGHTS;
cmh->cmsg_len = CMSG_LEN(sizeof(int));
memset(CMSG_DATA(cmh), -1, sizeof(int));
do {
ret = recvmsg(client->fd, &mh, 0);
if (ret >= 0 || (errno != EINTR && errno != EAGAIN))
break;
} while (1);
if (cmh->cmsg_len == CMSG_LEN(sizeof(int))) {
int fd;
memcpy(&fd, CMSG_DATA(cmh), sizeof(int));
if (fd != -1)
close(fd);
}
return ret;
}
static int bfd_vtysh_cmd_exec(struct bfd_vtysh_client *client, const char *cmd, char *data, size_t datasz)
{
int ret = 0;
char *bufvalid;
char *buf = data;
if (client->fd <= 0)
return -1;
ret = bfd_vtysh_client_send(client, cmd);
if (ret < 0)
goto out_err;
bufvalid = buf;
do {
ssize_t nread;
nread = bfd_vtysh_client_receive(client, bufvalid, datasz-1);
if (nread < 0 && (errno == EINTR || errno == EAGAIN))
continue;
if (nread <= 0) {
LOG_DEBUG("bfd vtysh_receive: error reading from [%s] (%d)", strerror(errno), errno);
goto out_err;
}
break;
} while (1);
return 0;
out_err:
return -1;
}
// return 0 : success
// return -1 : fail
int bfd_vtysh_pre_config(struct bfd_vtysh_client *client)
{
int ret = 0;
char stackbuf[4096];
if (client->fd <= 0)
return -1;
ret = bfd_vtysh_cmd_exec(client, "enable", stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [enable] error");
return -1;
}
ret = bfd_vtysh_cmd_exec(client, "conf t", stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [conf t] error");
return -1;
}
ret = bfd_vtysh_cmd_exec(client, "bfd", stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [bfd] error");
return -1;
}
return 0;
}
// return 0 : success
// return -1 : fail
int bfd_vtysh_add_dev(struct bfd_vtysh_client *client, const char *peer_addr, int retires, int interval_ms)
{
int ret = 0;
char cmd[256] = {0};
char stackbuf[4096];
if (client->fd <= 0)
return -1;
snprintf(cmd, sizeof(cmd), "peer %s", peer_addr);
ret = bfd_vtysh_cmd_exec(client, cmd, stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [%s] error", cmd);
return -1;
}
snprintf(cmd, sizeof(cmd), "detect-multiplier %d", retires);
ret = bfd_vtysh_cmd_exec(client, cmd, stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [%s] error", cmd);
return -1;
}
snprintf(cmd, sizeof(cmd), "receive-interval %d", interval_ms);
ret = bfd_vtysh_cmd_exec(client, cmd, stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [%s] error", cmd);
return -1;
}
snprintf(cmd, sizeof(cmd), "transmit-interval %d", interval_ms);
ret = bfd_vtysh_cmd_exec(client, cmd, stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [%s] error", cmd);
return -1;
}
return 0;
}
// return 0 : success
// return -1 : fail
int bfd_vtysh_del_dev(struct bfd_vtysh_client *client, const char *peer_addr)
{
int ret = 0;
char cmd[256] = {0};
char stackbuf[4096];
if (client->fd <= 0)
return -1;
snprintf(cmd, sizeof(cmd), "no peer %s", peer_addr);
ret = bfd_vtysh_cmd_exec(client, cmd, stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [%s] error", cmd);
return -1;
}
return 0;
}
// return 1 : up
// return 0 : down
int bfd_vtysh_get_dev_active(struct bfd_vtysh_client *client, char *addr)
{
int ret = 0;
char *p = NULL;
char cmd[256] = {0};
char stackbuf[4096];
if (client->fd <= 0)
return -1;
snprintf(cmd, sizeof(cmd), "do show bfd peer %s", addr);
ret = bfd_vtysh_cmd_exec(client, cmd, stackbuf, sizeof(stackbuf)-1);
if (ret < 0) {
LOG_DEBUG("bfd vtysh cmd [%s] error", cmd);
return -1;
}
// ex: Status: up/Status: down
if ((p = strstr(stackbuf, "Status: ")) == NULL)
return 0;
if (strncmp(p+8, "up", 2) == 0)
return 1;
return 0;
}
|
