[PATCH] iproute: disallow ip rule del without parameters

[Andrey Jr. Melnikov]

Disallow run `ip rule del` without any parameter to avoid delete any first
rule from table.

Signed-off-by: Andrey Jr. Melnikov <temnota...@gmail.com>
---

diff --git a/ip/iprule.c b/ip/iprule.c
index 8f24206..70562c5 100644
--- a/ip/iprule.c
+++ b/ip/iprule.c
@@ -346,6 +346,11 @@ static int iprule_modify(int cmd, int argc, char **argv)
                req.r.rtm_type = RTN_UNICAST;
        }
 
+       if (cmd == RTM_DELRULE && argc == 0) {
+               fprintf(stderr, "\"ip rule del\" requires arguments.\n");
+               return -1;
+       }
+
        while (argc > 0) {
                if (strcmp(*argv, "not") == 0) {
                        req.r.rtm_flags |= FIB_RULE_INVERT;