From d5c08f78bdf45668a955c1f3d3a96f35d8c0e91b Mon Sep 17 00:00:00 2001
From: Michael Brown <mcb30@ipxe.org>
Date: Wed, 19 Jul 2023 11:10:15 +0100
Subject: [ntp] Define NTP server setting

Define the IPv4 NTP server setting to simplify the use of a
DHCP-provided NTP server in scripts, using e.g.

  #!ipxe
  dhcp
  ntp ${ntp}

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---
 src/include/ipxe/dhcp.h |  3 +++
 src/net/udp/ntp.c       | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/src/include/ipxe/dhcp.h b/src/include/ipxe/dhcp.h
index a1f9ee250..51349efd9 100644
--- a/src/include/ipxe/dhcp.h
+++ b/src/include/ipxe/dhcp.h
@@ -86,6 +86,9 @@ struct dhcp_packet;
 /** Maximum transmission unit */
 #define DHCP_MTU 26
 
+/** NTP servers */
+#define DHCP_NTP_SERVERS 42
+
 /** Vendor encapsulated options */
 #define DHCP_VENDOR_ENCAP 43
 
diff --git a/src/net/udp/ntp.c b/src/net/udp/ntp.c
index 11f8ccc00..559233575 100644
--- a/src/net/udp/ntp.c
+++ b/src/net/udp/ntp.c
@@ -36,6 +36,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #include <ipxe/timer.h>
 #include <ipxe/time.h>
 #include <ipxe/tcpip.h>
+#include <ipxe/dhcp.h>
+#include <ipxe/settings.h>
 #include <ipxe/ntp.h>
 
 /** @file
@@ -273,3 +275,11 @@ int start_ntp ( struct interface *job, const char *hostname ) {
  err_alloc:
 	return rc;
 }
+
+/** IPv4 NTP server setting */
+const struct setting ntp_setting __setting ( SETTING_IP4_EXTRA, ntp ) = {
+	.name = "ntp",
+	.description = "NTP server",
+	.tag = DHCP_NTP_SERVERS,
+	.type = &setting_type_ipv4,
+};
-- 
cgit