|
| 1 | +use crate::Contains; |
| 2 | + |
| 3 | +use super::offset::Offset; |
| 4 | + |
| 5 | +/// An iterator over a network's _contained addresses_. |
| 6 | +pub struct AddressIterator<Network, Address> |
| 7 | +where |
| 8 | + Network: Contains<Address> + From<Address>, |
| 9 | +{ |
| 10 | + net: Network, |
| 11 | + cur: Option<Address>, |
| 12 | +} |
| 13 | + |
| 14 | +impl<Network, Address> AddressIterator<Network, Address> |
| 15 | +where |
| 16 | + Network: Contains<Address> + From<Address>, |
| 17 | +{ |
| 18 | + pub(crate) fn new(net: Network, cur: Option<Address>) -> Self { |
| 19 | + Self { net, cur } |
| 20 | + } |
| 21 | +} |
| 22 | + |
| 23 | +/// Implementation of the [`Iterator`] trait for [`AddressIterator`]. |
| 24 | +impl<Network, Address> Iterator for AddressIterator<Network, Address> |
| 25 | +where |
| 26 | + Address: Copy + Offset<u32>, |
| 27 | + Network: Contains<Address> + From<Address>, |
| 28 | +{ |
| 29 | + type Item = Address; |
| 30 | + |
| 31 | + /// Produce the next item. |
| 32 | + /// |
| 33 | + /// The current address is offset by `1_u32` using the [`Offset`] trait, which |
| 34 | + /// may produce `None`. |
| 35 | + fn next(&mut self) -> Option<Self::Item> { |
| 36 | + let cur: Option<Self::Item> = self.cur; |
| 37 | + let next: Option<Self::Item> = cur.and_then(|cur| cur.offset(1_u32)); |
| 38 | + |
| 39 | + match (cur, next) { |
| 40 | + (Some(cur), Some(next)) => { |
| 41 | + if self.net.contains(&cur) { |
| 42 | + self.cur = Some(next); |
| 43 | + Some(cur) |
| 44 | + } else { |
| 45 | + None |
| 46 | + } |
| 47 | + } |
| 48 | + (Some(cur), None) => { |
| 49 | + self.cur = None; |
| 50 | + Some(cur) |
| 51 | + } |
| 52 | + (None, _) => None, |
| 53 | + } |
| 54 | + } |
| 55 | +} |
| 56 | + |
| 57 | +#[cfg(test)] |
| 58 | +mod tests { |
| 59 | + use super::AddressIterator; |
| 60 | + |
| 61 | + mod netv4addr { |
| 62 | + use super::*; |
| 63 | + |
| 64 | + use crate::Netv4Addr; |
| 65 | + use std::net::Ipv4Addr; |
| 66 | + |
| 67 | + impl crate::Netv4Addr { |
| 68 | + pub fn iter(&self) -> AddressIterator<Netv4Addr, Ipv4Addr> { |
| 69 | + AddressIterator { |
| 70 | + net: *self, |
| 71 | + cur: Some(self.addr()), |
| 72 | + } |
| 73 | + } |
| 74 | + } |
| 75 | + |
| 76 | + #[test] |
| 77 | + fn loopback_slash_32_produces_one_off() { |
| 78 | + let net: Netv4Addr = "127.0.16.0/32".parse().unwrap(); |
| 79 | + |
| 80 | + let mut it: AddressIterator<Netv4Addr, Ipv4Addr> = net.iter(); |
| 81 | + assert_eq!(it.next(), "127.0.16.0".parse::<Ipv4Addr>().ok()); |
| 82 | + assert_eq!(it.next(), None); |
| 83 | + } |
| 84 | + |
| 85 | + #[test] |
| 86 | + fn loopback_slash_29_produces_one_off() { |
| 87 | + let net: Netv4Addr = "127.0.16.0/29".parse().unwrap(); |
| 88 | + |
| 89 | + let mut it: AddressIterator<Netv4Addr, Ipv4Addr> = net.iter(); |
| 90 | + assert_eq!(it.next(), "127.0.16.0".parse::<Ipv4Addr>().ok()); |
| 91 | + assert_eq!(it.next(), "127.0.16.1".parse::<Ipv4Addr>().ok()); |
| 92 | + assert_eq!(it.next(), "127.0.16.2".parse::<Ipv4Addr>().ok()); |
| 93 | + assert_eq!(it.next(), "127.0.16.3".parse::<Ipv4Addr>().ok()); |
| 94 | + assert_eq!(it.next(), "127.0.16.4".parse::<Ipv4Addr>().ok()); |
| 95 | + assert_eq!(it.next(), "127.0.16.5".parse::<Ipv4Addr>().ok()); |
| 96 | + assert_eq!(it.next(), "127.0.16.6".parse::<Ipv4Addr>().ok()); |
| 97 | + assert_eq!(it.next(), "127.0.16.7".parse::<Ipv4Addr>().ok()); |
| 98 | + assert_eq!(it.next(), None); |
| 99 | + } |
| 100 | + |
| 101 | + #[test] |
| 102 | + fn loopback_max_value_properly_stops() { |
| 103 | + let net: Netv4Addr = "255.255.255.255/31".parse().unwrap(); |
| 104 | + |
| 105 | + let mut it: AddressIterator<Netv4Addr, Ipv4Addr> = net.iter(); |
| 106 | + assert_eq!(it.next(), "255.255.255.254".parse::<Ipv4Addr>().ok()); |
| 107 | + assert_eq!(it.next(), "255.255.255.255".parse::<Ipv4Addr>().ok()); |
| 108 | + assert_eq!(it.next(), None); |
| 109 | + } |
| 110 | + } |
| 111 | + |
| 112 | + mod netaddr { |
| 113 | + use super::*; |
| 114 | + |
| 115 | + use crate::NetAddr; |
| 116 | + use std::net::IpAddr; |
| 117 | + |
| 118 | + mod v4 { |
| 119 | + use super::*; |
| 120 | + |
| 121 | + #[test] |
| 122 | + fn loopback_slash_32_produces_one_off() { |
| 123 | + let net: NetAddr = "127.0.16.0/32".parse().unwrap(); |
| 124 | + |
| 125 | + let mut it: AddressIterator<NetAddr, IpAddr> = net.iter(); |
| 126 | + assert_eq!(it.next(), "127.0.16.0".parse::<IpAddr>().ok()); |
| 127 | + assert_eq!(it.next(), None); |
| 128 | + } |
| 129 | + |
| 130 | + #[test] |
| 131 | + fn loopback_slash_29_produces_all_ips_in_network() { |
| 132 | + let net: NetAddr = "127.0.16.0/29".parse().unwrap(); |
| 133 | + |
| 134 | + let mut it: AddressIterator<NetAddr, IpAddr> = net.iter(); |
| 135 | + assert_eq!(it.next(), "127.0.16.0".parse::<IpAddr>().ok()); |
| 136 | + assert_eq!(it.next(), "127.0.16.1".parse::<IpAddr>().ok()); |
| 137 | + assert_eq!(it.next(), "127.0.16.2".parse::<IpAddr>().ok()); |
| 138 | + assert_eq!(it.next(), "127.0.16.3".parse::<IpAddr>().ok()); |
| 139 | + assert_eq!(it.next(), "127.0.16.4".parse::<IpAddr>().ok()); |
| 140 | + assert_eq!(it.next(), "127.0.16.5".parse::<IpAddr>().ok()); |
| 141 | + assert_eq!(it.next(), "127.0.16.6".parse::<IpAddr>().ok()); |
| 142 | + assert_eq!(it.next(), "127.0.16.7".parse::<IpAddr>().ok()); |
| 143 | + assert_eq!(it.next(), None); |
| 144 | + } |
| 145 | + |
| 146 | + #[test] |
| 147 | + fn loopback_max_value_properly_stops() { |
| 148 | + let net: NetAddr = "255.255.255.255/31".parse().unwrap(); |
| 149 | + |
| 150 | + let mut it: AddressIterator<NetAddr, IpAddr> = net.iter(); |
| 151 | + assert_eq!(it.next(), "255.255.255.254".parse::<IpAddr>().ok()); |
| 152 | + assert_eq!(it.next(), "255.255.255.255".parse::<IpAddr>().ok()); |
| 153 | + assert_eq!(it.next(), None); |
| 154 | + } |
| 155 | + } |
| 156 | + |
| 157 | + mod v6 { |
| 158 | + use super::*; |
| 159 | + |
| 160 | + #[test] |
| 161 | + fn slash_128_produces_one_off() { |
| 162 | + let net: NetAddr = "2001:db8::1/128".parse().unwrap(); |
| 163 | + |
| 164 | + let mut it: AddressIterator<NetAddr, IpAddr> = net.iter(); |
| 165 | + assert_eq!(it.next(), "2001:db8::1".parse::<IpAddr>().ok()); |
| 166 | + assert_eq!(it.next(), None); |
| 167 | + } |
| 168 | + |
| 169 | + #[test] |
| 170 | + fn slash_125_produces_all_ips_in_network() { |
| 171 | + let net: NetAddr = "2001:db8::1/125".parse().unwrap(); |
| 172 | + |
| 173 | + let mut it: AddressIterator<NetAddr, IpAddr> = net.iter(); |
| 174 | + assert_eq!(it.next(), "2001:db8::0".parse::<IpAddr>().ok()); |
| 175 | + assert_eq!(it.next(), "2001:db8::1".parse::<IpAddr>().ok()); |
| 176 | + assert_eq!(it.next(), "2001:db8::2".parse::<IpAddr>().ok()); |
| 177 | + assert_eq!(it.next(), "2001:db8::3".parse::<IpAddr>().ok()); |
| 178 | + assert_eq!(it.next(), "2001:db8::4".parse::<IpAddr>().ok()); |
| 179 | + assert_eq!(it.next(), "2001:db8::5".parse::<IpAddr>().ok()); |
| 180 | + assert_eq!(it.next(), "2001:db8::6".parse::<IpAddr>().ok()); |
| 181 | + assert_eq!(it.next(), "2001:db8::7".parse::<IpAddr>().ok()); |
| 182 | + assert_eq!(it.next(), None); |
| 183 | + } |
| 184 | + |
| 185 | + #[test] |
| 186 | + fn loopback_max_value_properly_stops() { |
| 187 | + let net: NetAddr = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/127" |
| 188 | + .parse() |
| 189 | + .unwrap(); |
| 190 | + |
| 191 | + let mut it: AddressIterator<NetAddr, IpAddr> = net.iter(); |
| 192 | + assert_eq!( |
| 193 | + it.next(), |
| 194 | + "ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe" |
| 195 | + .parse::<IpAddr>() |
| 196 | + .ok() |
| 197 | + ); |
| 198 | + assert_eq!( |
| 199 | + it.next(), |
| 200 | + "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff" |
| 201 | + .parse::<IpAddr>() |
| 202 | + .ok() |
| 203 | + ); |
| 204 | + assert_eq!(it.next(), None); |
| 205 | + } |
| 206 | + } |
| 207 | + } |
| 208 | +} |
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