// isValidEndpoint checks that the given host / port pair are valid endpoint
func isValidEndpoint(host string, port int) bool {
	return host != "" && port > 0
}

// IsZeroCIDR checks whether the input CIDR string is either
// the IPv4 or IPv6 zero CIDR
func IsZeroCIDR(cidr string) bool {
	if cidr == IPv4ZeroCIDR || cidr == IPv6ZeroCIDR {
		return true
	}
	return false
}

		_, cidr, _ := netutils.ParseCIDRSloppy(str)

		if netutils.IsIPv4CIDR(cidr) {
			if cidr.IP.IsLoopback() || cidr.Contains(ipv4LoopbackStart) {
				npa.containsIPv4Loopback = true
			}
		}

		if IsZeroCIDR(str) {
			// Ignore everything else
			npa.cidrs = []*net.IPNet{cidr}
			npa.matchAll = true
			break
		}

		npa.cidrs = append(npa.cidrs, cidr)
	}

	return npa
}

		{
			name:     "ipv6 zero cidr",
			input:    IPv6ZeroCIDR,
			expected: true,
		},
	}
	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			if got := IsZeroCIDR(tc.input); tc.expected != got {
				t.Errorf("IsZeroCIDR() = %t, want %t", got, tc.expected)
			}
		})
	}