nftables: fix parsing date expressions

Musl libc does not support the non-POSIX "%F" format for strptime() so
replace all occurrences of it with an equivalent "%Y-%m-%d" format.

Fixes: #10419
Signed-off-by: Jo-Philipp Wich <[email protected]>

package/network/utils/nftables/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=nftables
 PKG_VERSION:=1.0.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://netfilter.org/projects/$(PKG_NAME)/files

package/network/utils/nftables/patches/0001-meta-don-t-use-non-POSIX-formats-in-strptime.patch

@@ -0,0 +1,49 @@
+From 1af8aabccd65e11caa397c4706353075f623cd01 Mon Sep 17 00:00:00 2001
+From: Jo-Philipp Wich <[email protected]>
+Date: Mon, 8 Aug 2022 23:57:03 +0200
+Subject: [PATCH] meta: don't use non-POSIX formats in strptime()
+
+The current strptime() invocations in meta.c use the `%F` format which
+is not specified by POSIX and thus unimplemented by some libc flavors
+such as musl libc.
+
+Replace all occurrences of `%F` with an equivalent `%Y-%m-%d` format
+in order to be able to properly parse user supplied dates in such
+environments.
+
+Signed-off-by: Jo-Philipp Wich <[email protected]>
+---
+ src/meta.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/src/meta.c b/src/meta.c
+index 80ace25b..257bbc9f 100644
+--- a/src/meta.c
++++ b/src/meta.c
+@@ -399,7 +399,7 @@ static void date_type_print(const struct expr *expr, struct output_ctx *octx)
+ 		tstamp += cur_tm->tm_gmtoff;
+ 
+ 	if ((tm = gmtime((time_t *) &tstamp)) != NULL &&
+-	     strftime(timestr, sizeof(timestr) - 1, "%F %T", tm))
++	     strftime(timestr, sizeof(timestr) - 1, "%Y-%m-%d %T", tm))
+ 		nft_print(octx, "\"%s\"", timestr);
+ 	else
+ 		nft_print(octx, "Error converting timestamp to printed time");
+@@ -412,11 +412,11 @@ static bool parse_iso_date(uint64_t *tstamp, const char *sym)
+ 
+ 	memset(&tm, 0, sizeof(struct tm));
+ 
+-	if (strptime(sym, "%F %T", &tm))
++	if (strptime(sym, "%Y-%m-%d %T", &tm))
+ 		goto success;
+-	if (strptime(sym, "%F %R", &tm))
++	if (strptime(sym, "%Y-%m-%d %R", &tm))
+ 		goto success;
+-	if (strptime(sym, "%F", &tm))
++	if (strptime(sym, "%Y-%m-%d", &tm))
+ 		goto success;
+ 
+ 	return false;
+-- 
+2.35.1
+