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    use std::{str, net};

    #[derive(Debug, PartialEq, Clone, Copy)]
    pub enum InternetProtocol {
    	Any,
    	IpV4,
    	IpV6,
    }

    impl Default for InternetProtocol {
    	fn default() -> Self {
    		InternetProtocol::Any
    	}
    }

    impl str::FromStr for InternetProtocol {
    	type Err = &'static str;

    	fn from_str(s: &str) -> Result<Self, Self::Err> {
    		match s {
    			"ipv4" => Ok(InternetProtocol::IpV4),
    			"ipv6" => Ok(InternetProtocol::IpV6),
    			_ => Err("Invalid internet protocol"),
    		}
    	}
    }

    impl InternetProtocol {
    	pub fn is_allowed(&self, addr: &net::SocketAddr) -> bool {
    		match *self {
    			InternetProtocol::Any => true,
    			InternetProtocol::IpV4 => match *addr {
    				net::SocketAddr::V4(_) => true,
    				_ => false,
    			},
    			InternetProtocol::IpV6 => match *addr {
    				net::SocketAddr::V6(_) => true,
    				_ => false,
    			}
    		}
    	}
    }

    #[cfg(test)]
    mod tests {
    	use super::InternetProtocol;

    	#[test]
    	fn test_default_internet_protocol() {
    		assert_eq!(InternetProtocol::default(), InternetProtocol::Any);
    	}

    	#[test]
    	fn test_parsing_internet_protocol() {
    		assert_eq!(InternetProtocol::IpV4, "ipv4".parse().unwrap());
    		assert_eq!(InternetProtocol::IpV6, "ipv6".parse().unwrap());
    		assert!("sa".parse::<InternetProtocol>().is_err());
    	}
    }

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