+/**
+ * Check if a given address passes an access control list.
+ *
+ * @param p_acl pre-existing ACL to match the address against
+ * @param psz_ip numeric IPv4/IPv6 address
+ *
+ * @return 0 if the first matching ACL entry is an access grant,
+ * 1 if the first matching ACL entry is a denial of access,
+ * -1 on error.