1 /*
2 * Copyright (c) 2019 Linaro Limited
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6 #include <errno.h>
7
8 #include <zephyr/net/sntp.h>
9 #include <zephyr/net/socketutils.h>
10
sntp_simple(const char * server,uint32_t timeout,struct sntp_time * time)11 int sntp_simple(const char *server, uint32_t timeout, struct sntp_time *time)
12 {
13 int res;
14 static struct zsock_addrinfo hints;
15 struct zsock_addrinfo *addr;
16 struct sntp_ctx sntp_ctx;
17 uint64_t deadline;
18 uint32_t iter_timeout;
19
20 hints.ai_family = AF_UNSPEC;
21 hints.ai_socktype = SOCK_DGRAM;
22 hints.ai_protocol = 0;
23 /* 123 is the standard SNTP port per RFC4330 */
24 res = net_getaddrinfo_addr_str(server, "123", &hints, &addr);
25
26 if (res < 0) {
27 /* Just in case, as namespace for getaddrinfo errors is
28 * different from errno errors.
29 */
30 errno = EDOM;
31 return res;
32 }
33
34 res = sntp_init(&sntp_ctx, addr->ai_addr, addr->ai_addrlen);
35 if (res < 0) {
36 goto freeaddr;
37 }
38
39 if (timeout == SYS_FOREVER_MS) {
40 deadline = (uint64_t)timeout;
41 } else {
42 deadline = k_uptime_get() + (uint64_t)timeout;
43 }
44
45 /* Timeout for current iteration */
46 iter_timeout = 100;
47
48 while (k_uptime_get() < deadline) {
49 res = sntp_query(&sntp_ctx, iter_timeout, time);
50
51 if (res != -ETIMEDOUT) {
52 break;
53 }
54
55 /* Exponential backoff with limit */
56 if (iter_timeout < 1000) {
57 iter_timeout *= 2;
58 }
59 }
60
61 sntp_close(&sntp_ctx);
62
63 freeaddr:
64 zsock_freeaddrinfo(addr);
65
66 return res;
67 }
68
