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Implement RFC4075 Receive SNTP servers via DHCPv6

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This adds support for RFC4075 SNTP server configuration via DHCPv6.
The DHCPv6 options transmitted are now conditional on how LwIP is
configured.

A new SNTP application option SNTP_GET_SERVERS_FROM_DHCPV6 is used
to enable. For simplicity this is configured to use the global
LWIP_DHCP6_GET_NTP_SRV configuration setting.

Tests:
 - Check the global options now control the DHCPv6 request sent
   in Wireshark
 - Check against 0, 1 and 3 SNTP servers configured on an odhcpd
   server configured to support RFC 4075 SNTP server lists.
   Verify that the SNTP server list is updated on connection
   establishment on an ESP8266 WeMOS D1.
 - Verify that SNTP packets are sent and recieved from a
   configured server and that system time is updated.

Signed-off-by: David J. Fiddes <D.J@fiddes.net>
(cherry picked from commit 8f2f43f093)
This commit is contained in:
David J. Fiddes
2019-01-19 12:21:56 +00:00
committed by Simon Goldschmidt
parent 67350e3c01
commit 0d6d8922f2
4 changed files with 51 additions and 8 deletions
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6
src/include/lwip/apps/sntp.h
View File

@@ -67,11 +67,11 @@ void sntp_setservername(u8_t idx, const char *server);
const char *sntp_getservername(u8_t idx);
#endif /* SNTP_SERVER_DNS */
#if SNTP_GET_SERVERS_FROM_DHCP
#if SNTP_GET_SERVERS_FROM_DHCP || SNTP_GET_SERVERS_FROM_DHCPV6
void sntp_servermode_dhcp(int set_servers_from_dhcp);
#else /* SNTP_GET_SERVERS_FROM_DHCP */
#else /* SNTP_GET_SERVERS_FROM_DHCP || SNTP_GET_SERVERS_FROM_DHCPV6 */
#define sntp_servermode_dhcp(x)
#endif /* SNTP_GET_SERVERS_FROM_DHCP */
#endif /* SNTP_GET_SERVERS_FROM_DHCP || SNTP_GET_SERVERS_FROM_DHCPV6 */
#ifdef __cplusplus
}

6
src/include/lwip/apps/sntp_opts.h
View File

@@ -67,6 +67,12 @@
#define SNTP_GET_SERVERS_FROM_DHCP LWIP_DHCP_GET_NTP_SRV
#endif
/** Set this to 1 to implement the callback function called by dhcpv6 when
* NTP servers are received. */
#if !defined SNTP_GET_SERVERS_FROM_DHCPV6 || defined __DOXYGEN__
#define SNTP_GET_SERVERS_FROM_DHCPV6 LWIP_DHCP6_GET_NTP_SRV
#endif
/** Set this to 1 to support DNS names (or IP address strings) to set sntp servers
* One server address/name can be defined as default if SNTP_SERVER_DNS == 1:
* \#define SNTP_SERVER_ADDRESS "pool.ntp.org"