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netutils: prefer DHCP-provided NTP servers for ntpc

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Use the DHCP-learned NTP server list as the default ntpc server source when DHCP option 42 is available.

Fall back to CONFIG_NETUTILS_NTPCLIENT_SERVER only when DHCP does not provide any NTP servers, and restart ntpc when the DHCP-provided server list changes.

Signed-off-by: Jerry Ma <masc2008@gmail.com>
This commit is contained in:
shichunma 2026-04-11 18:41:05 +08:00 • committed by Alan C. Assis
parent 4b705721ca
commit c82957109f
6 changed files with 535 additions and 33 deletions
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43
include/netutils/netlib.h
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@ -203,6 +203,11 @@ struct url_s
};
#endif
#ifdef CONFIG_NETUTILS_DHCPC
typedef CODE void (*netlib_dhcp_ntp_callback_t)
(FAR const char *ntp_server_list, FAR void *arg);
#endif
/****************************************************************************
* Public Data
****************************************************************************/
@ -247,6 +252,44 @@ ssize_t netlib_get_devices(FAR struct netlib_device_s *devlist,
bool netlib_ipv4addrconv(FAR const char *addrstr, FAR uint8_t *addr);
bool netlib_ethaddrconv(FAR const char *hwstr, FAR uint8_t *hw);
#ifdef CONFIG_NETUTILS_DHCPC
/****************************************************************************
* Name: netlib_set_ntp_servers_from_dhcp
*
* Description:
* Update the currently active DHCP option 42 NTP server list. The list
* contains semicolon-separated hostnames or addresses. Passing NULL or
* an empty string clears the DHCP-provided list.
*
****************************************************************************/
int netlib_set_ntp_servers_from_dhcp(FAR const char *ntp_server_list);
/****************************************************************************
* Name: netlib_register_dhcp_ntp_callback
*
* Description:
* Register a callback to receive DHCP option 42 NTP server list updates.
* The current list, if any, is replayed immediately after registration.
* Only one callback may be registered at a time.
*
****************************************************************************/
int netlib_register_dhcp_ntp_callback(netlib_dhcp_ntp_callback_t callback,
FAR void *arg);
/****************************************************************************
* Name: netlib_unregister_dhcp_ntp_callback
*
* Description:
* Unregister a previously registered DHCP option 42 NTP update callback.
*
****************************************************************************/
int netlib_unregister_dhcp_ntp_callback(netlib_dhcp_ntp_callback_t callback,
FAR void *arg);
#endif
#ifdef CONFIG_NET_ETHERNET
/* Get and set IP/MAC addresses (Ethernet L2 only) */