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
|
/**
* @file refclock_sock.c
* @brief Implements a servo providing samples over Unix domain socket.
* @note Copyright (C) 2023 Miroslav Lichvar <mlichvar@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include "refclock_sock.h"
#include "config.h"
#include "print.h"
#include "servo_private.h"
#define LEAP_NORMAL 0
#define LEAP_INSERT 1
#define LEAP_DELETE 2
#define SOCK_MAGIC 0x534f434b
/* Copied from chrony-3.2/refclock_sock.c */
struct sock_sample {
/* Time of the measurement (system time) */
struct timeval tv;
/* Offset between the true time and the system time (in seconds) */
double offset;
/* Non-zero if the sample is from a PPS signal, i.e. another source
is needed to obtain seconds */
int pulse;
/* 0 - normal, 1 - insert leap second, 2 - delete leap second */
int leap;
/* Padding, ignored */
int _pad;
/* Protocol identifier (0x534f434b) */
int magic;
};
struct sock_servo {
struct servo servo;
int sock_fd;
int leap;
};
static void refclock_sock_destroy(struct servo *servo)
{
struct sock_servo *s = container_of(servo, struct sock_servo, servo);
free(s);
}
static double refclock_sock_sample(struct servo *servo,
int64_t offset,
uint64_t local_ts,
double weight,
enum servo_state *state)
{
struct sock_servo *s = container_of(servo, struct sock_servo, servo);
struct sock_sample sample;
memset(&sample, 0, sizeof(sample));
sample.tv.tv_sec = local_ts / 1000000000ULL;
sample.tv.tv_usec = local_ts % 1000000000ULL / 1000U;
sample.offset = -offset / 1e9;
sample.magic = SOCK_MAGIC;
switch (s->leap) {
case -1:
sample.leap = LEAP_DELETE;
break;
case 1:
sample.leap = LEAP_INSERT;
break;
default:
sample.leap = LEAP_NORMAL;
}
if (send(s->sock_fd, &sample, sizeof sample, 0) != sizeof sample) {
pr_err("refclock_sock: send failed: %m");
return 0;
}
*state = SERVO_UNLOCKED;
return 0.0;
}
static void refclock_sock_sync_interval(struct servo *servo, double interval)
{
}
static void refclock_sock_reset(struct servo *servo)
{
}
static void refclock_sock_leap(struct servo *servo, int leap)
{
struct sock_servo *s = container_of(servo, struct sock_servo, servo);
s->leap = leap;
}
struct servo *refclock_sock_servo_create(struct config *cfg)
{
char *addr = config_get_string(cfg, NULL, "refclock_sock_address");
struct sockaddr_un sa;
struct sock_servo *s;
int i;
s = calloc(1, sizeof(*s));
if (!s)
return NULL;
s->servo.destroy = refclock_sock_destroy;
s->servo.sample = refclock_sock_sample;
s->servo.sync_interval = refclock_sock_sync_interval;
s->servo.reset = refclock_sock_reset;
s->servo.leap = refclock_sock_leap;
s->sock_fd = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (s->sock_fd < 0) {
pr_err("refclock_sock: failed to create socket: %m");
free(s);
return NULL;
}
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_LOCAL;
strncpy(sa.sun_path, addr, sizeof(sa.sun_path) - 1);
/* Wait up to 1 second for the server socket to be created */
for (i = 10; i >= 0; i--) {
if (!connect(s->sock_fd, (struct sockaddr *)&sa, sizeof(sa)))
break;
if (i > 0) {
usleep(100000);
continue;
}
pr_err("refclock_sock: connect failed: %m");
close(s->sock_fd);
free(s);
return NULL;
}
return &s->servo;
}
|
