1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165

//! Provide operations over IP networks.
use std::fmt;
use addr::{IpAddrVersion, IpAddr};
pub use self::IpNetwork::*;

pub mod ipv4;
pub mod ipv6;

/// Describe an IP network.
#[derive(Copy, Clone, Show, PartialEq, Eq, PartialOrd,
            Ord, Hash, RustcEncodable, RustcDecodable)]
pub enum IpNetwork {
    Ipv4Network(ipv4::IpNetwork),
    Ipv6Network(ipv6::IpNetwork),
}

macro_rules! mirror(
    ($addr:expr, $net:ident => $value:expr) => ({
        match $addr {
            Ipv4Network(ref $net) => $value,
            Ipv6Network(ref $net) => $value,
        }
    });
    (ip: $addr:expr, $net:ident => $value:expr) => ({
        use addr::IpAddr::*;

        match $addr {
            Ipv4Network(ref $net) => Ipv4Addr($value),
            Ipv6Network(ref $net) => Ipv6Addr($value),
        }
    });
    (net: $addr:expr, $net:ident => $value:expr) => ({
        match $addr {
            Ipv4Network(ref $net) => Ipv4Network($value),
            Ipv6Network(ref $net) => Ipv6Network($value),
        }
    });
);

impl IpNetwork {
    /// Get the corresponding IP address version.
    pub fn version(&self) -> IpAddrVersion {
        mirror!(*self, net => net.version())
    }

    /// Get the network address for the network.
    pub fn address(&self) -> IpAddr {
        mirror!(ip: *self, net => net.address())
    }

    /// Get the broadcast address for the network.
    pub fn broadcast_address(&self) -> IpAddr {
        mirror!(ip: *self, net => net.broadcast_address())
    }

    /// Get the length of the network prefix, in bits.
    pub fn prefix(&self) -> uint {
        mirror!(*self, net => net.prefix())
    }

    /// Get the length of the host prefix, in bits.
    pub fn host_prefix(&self) -> uint {
        mirror!(*self, net => net.host_prefix())
    }

    /// The total number of addresses in the network.
    pub fn num_addresses(&self) -> uint {
        mirror!(*self, net => net.num_addresses())
    }

    /// Get the mask of the network.
    pub fn mask(&self) -> IpAddr {
        mirror!(ip: *self, net => net.mask())
    }

    /// Get the hosts range this network have.
    pub fn range(&self) -> (IpAddr, IpAddr) {
        use addr::IpAddr::*;

        match *self {
            Ipv4Network(ref net) => {
                let (start, stop) = net.range();
                (Ipv4Addr(start), Ipv4Addr(stop))
            }
            Ipv6Network(ref net) => {
                let (start, stop) = net.range();
                (Ipv6Addr(start), Ipv6Addr(stop))
            }
        }
    }

    /// `true` if this ip is contained in the network.
    pub fn contains(&self, ip: IpAddr) -> bool {
        use addr::IpAddr::*;

        match (*self, ip) {
            (Ipv4Network(ref net), Ipv4Addr(ip)) => net.contains(ip),
            (Ipv6Network(ref net), Ipv6Addr(ip)) => net.contains(ip),
            _ => false,
        }
    }
    /// `true` if this network is partly or wholly contained in other or other is wholly contained in this network.
    pub fn overlaps(&self, other: IpNetwork) -> bool {
        match (*self, other) {
            (Ipv4Network(ref neta), Ipv4Network(netb)) => neta.overlaps(netb),
            (Ipv6Network(ref neta), Ipv6Network(netb)) => neta.overlaps(netb),
            _ => false,
        }
    }

    /// Iterate over all addresses of this network.
    pub fn iter(&self) -> Hosts {
        let (start, stop) = self.range();
        Hosts {
            state: start,
            stop: stop,
        }
    }

    /// Iterate over all usable hosts of this network.
    pub fn hosts_iter(&self) -> Hosts {
        let (start, stop) = self.range();
        Hosts {
            state: start + 1,
            stop: stop - 1,
        }
    }
}

impl fmt::String for IpNetwork {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        mirror!(*self, net => net.fmt(f))
    }
}

#[derive(Copy, Clone)]
pub struct Hosts {
    state: IpAddr,
    stop: IpAddr,
}

impl Iterator for Hosts {
    type Item = IpAddr;

    fn next(&mut self) -> Option<IpAddr> {
        if self.state <= self.stop {
            let result = self.state;
            self.state = self.state + 1;
            Some(result)
        } else {
            None
        }
    }
}

impl DoubleEndedIterator for Hosts {
    fn next_back(&mut self) -> Option<IpAddr> {
        if self.stop >= self.state {
            self.stop = self.stop - 1;
            Some(self.stop)
        } else {
            None
        }
    }
}