netdev - [PATCH iproute2] ipnetns: parse nsid as a signed integer

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Date:   Wed, 21 Nov 2018 10:44:27 +0100
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     stephen@...workplumber.org
Cc:     netdev@...r.kernel.org, dsahern@...il.com, joe@...d.net.nz,
        daniel@...earbox.net, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH iproute2] ipnetns: parse nsid as a signed integer

Don't confuse the user, nsid is a signed integer, this kind of command
should return an error: 'ip netns set foo 0xffffffff'.

Also, a valid value is a positive value. To let the kernel chooses a value,
the keyword 'auto' must be used.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 ip/ipnetns.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index 0eac18cf2682..03879b496343 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -35,6 +35,7 @@ static int usage(void)
 	fprintf(stderr, "       ip [-all] netns exec [NAME] cmd ...\n");
 	fprintf(stderr, "       ip netns monitor\n");
 	fprintf(stderr, "       ip netns list-id\n");
+	fprintf(stderr, "NETNSID := auto | POSITIVE-INT\n");
 	exit(-1);
 }
 
@@ -739,8 +740,7 @@ static int netns_set(int argc, char **argv)
 {
 	char netns_path[PATH_MAX];
 	const char *name;
-	unsigned int nsid;
-	int netns;
+	int netns, nsid;
 
 	if (argc < 1) {
 		fprintf(stderr, "No netns name specified\n");
@@ -754,8 +754,10 @@ static int netns_set(int argc, char **argv)
 	/* If a negative nsid is specified the kernel will select the nsid. */
 	if (strcmp(argv[1], "auto") == 0)
 		nsid = -1;
-	else if (get_unsigned(&nsid, argv[1], 0))
+	else if (get_integer(&nsid, argv[1], 0))
 		invarg("Invalid \"netnsid\" value\n", argv[1]);
+	else if (nsid < 0)
+		invarg("\"netnsid\" value should be >= 0\n", argv[1]);
 
 	snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name);
 	netns = open(netns_path, O_RDONLY | O_CLOEXEC);
-- 
2.18.0