[libnftnl PATCH] utils: Drop asterisk from end of NFTA_DEVICE_PREFIX strings

[Phil Sutter <phil@nwl.cc>]

The asterisk left in place becomes part of the prefix by accident and is thus
both included when matching interface names as well as dumped back to user
space.

Fixes: f30eae26d813e ("utils: Add helpers for interface name wildcards")
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
This code is currently unused by nftables at least since it builds the
netlink message itself.
---
 src/utils.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/utils.c b/src/utils.c
index c4bbd4f7ed171..d73c5f6175802 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -164,9 +164,16 @@ static bool is_wildcard_str(const char *str)
 
 void nftnl_attr_put_ifname(struct nlmsghdr *nlh, const char *ifname)
 {
-	uint16_t attr = is_wildcard_str(ifname) ?
-			NFTA_DEVICE_PREFIX : NFTA_DEVICE_NAME;
+	uint16_t attr = NFTA_DEVICE_NAME;
+	char pfx[IFNAMSIZ];
 
+	if (is_wildcard_str(ifname)) {
+		snprintf(pfx, IFNAMSIZ, "%s", ifname);
+		pfx[strlen(pfx) - 1] = '\0';
+
+		attr = NFTA_DEVICE_PREFIX;
+		ifname = pfx;
+	}
 	mnl_attr_put_strz(nlh, attr, ifname);
 }
 
-- 
2.51.0