libxt_time: fix random --datestart skips

Frank Lichtenheld points out that -m time --datestart ...
sometimes messes up --datestart:

$ iptables -A INPUT -m time --datestart 2010-11-24T16:50:00 -j ACCEPT
$ iptables-save | grep 11
-A INPUT -m time --datestart 2010-11-24T16:50:00 -j ACCEPT
$ iptables-save | iptables-restore
$ iptables-save | grep 11
-A INPUT -m time --datestart 2010-11-24T15:50:00 -j ACCEPT

--datestart moved by one hour.

As the --timestart option does not care about DST, always set
dst=0 when parsing --starttime input.

Reported-by: Frank Lichtenheld <flichtenheld@astaro.com>
Signed-off-by: Florian Westphal <fwestphal@astaro.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/extensions/libxt_time.c b/extensions/libxt_time.c
index 5462d930..b2e6ffa6 100644
--- a/extensions/libxt_time.c
+++ b/extensions/libxt_time.c
@@ -139,6 +139,7 @@ static time_t time_parse_date(const char *s, bool end)
 	tm.tm_hour = hour;
 	tm.tm_min  = minute;
 	tm.tm_sec  = second;
+	tm.tm_isdst = 0;
 	ret = mktime(&tm);
 	if (ret >= 0)
 		return ret;