net/openntpd: fix for NICs with hardware timestamp support

OpenNTPD enables the reception of a timestamp with datagrams.
Network adapters that support hardware timestamping of packets,
e.g. mlx5en(4), create a SCM_TIME_INFO control message in addition
to the SCM_TIMESTAMP one.  Provide a sufficiently large buffer to
accommodate this and avoid a MSG_CTRUNC error.

PR:		271224
Obtained from:	Dmitry Wagin <dmitry.wagin@ya.ru>

net/openntpd/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	openntpd
 PORTVERSION=	6.8p1
-PORTREVISION=	6
+PORTREVISION=	7
 PORTEPOCH=	2
 CATEGORIES=	net
 MASTER_SITES=	OPENBSD/OpenNTPD

net/openntpd/files/patch-src_client.c

@@ -0,0 +1,25 @@
+--- src/client.c.orig	2023-05-05 18:43:35 UTC
++++ src/client.c
+@@ -274,6 +274,13 @@ handle_auto(uint8_t trusted, double offset)
+ }
+ 
+ 
++#ifdef SCM_TIME_INFO
++#define CMSG_MAXLEN (CMSG_SPACE(sizeof(struct timeval)) + \
++	CMSG_SPACE(sizeof(struct sock_timestamp_info)))
++#else
++#define CMSG_MAXLEN CMSG_SPACE(sizeof(struct timeval))
++#endif
++
+ /*
+  * -1: Not processed, not an NTP message (e.g. icmp induced  ECONNREFUSED)
+  *  0: Not prrocessed due to validation issues
+@@ -289,7 +296,7 @@ client_dispatch(struct ntp_peer *p, u_int8_t settime, 
+ 	char			 buf[NTP_MSGSIZE];
+ 	union {
+ 		struct cmsghdr	hdr;
+-		char		buf[CMSG_SPACE(sizeof(tv))];
++		char		buf[CMSG_MAXLEN];
+ 	} cmsgbuf;
+ #ifdef SO_TIMESTAMP
+ 	struct cmsghdr		*cmsg;