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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
#![allow(clippy::from_over_into)]
use crate::common::expr::Expr;
use memchr::memchr;
use std::cmp::Ordering;
use std::collections::HashMap;
use std::fmt;
use std::fmt::Debug;
use std::net::IpAddr;
use std::net::Ipv4Addr;
use std::net::Ipv6Addr;
use std::str::FromStr;
pub const BITMASK: u128 = 0x8000_0000_0000_0000_0000_0000_0000_0000;
pub const BITCOUNT: u8 = 128;
pub type Addr = IpAddr;
#[derive(Debug)]
pub enum Error {
InvalidAddr(String),
InvalidBlock(String),
InvalidMaskLength(String),
InvalidNibblesCount(usize),
MaskLengthTooLarge(u8),
}
#[derive(Copy, Clone, Eq)]
pub struct Block {
pub addr: u128,
pub mlen: u8,
}
pub type Meta = HashMap<String, Expr>;
impl Block {
fn new(addr: IpAddr, mlen: u8) -> Self {
let (ipv6_addr, ipv6_mlen) = match addr {
IpAddr::V4(addr) => {
assert!(mlen <= 32);
(addr.to_ipv6_mapped(), mlen + 96)
}
IpAddr::V6(addr) => {
assert!(mlen <= 128);
(addr, mlen)
}
};
let segments = ipv6_addr.segments();
let addr_bits = ((segments[0] as u128) << 112)
| ((segments[1] as u128) << 96)
| ((segments[2] as u128) << 80)
| ((segments[3] as u128) << 64)
| ((segments[4] as u128) << 48)
| ((segments[5] as u128) << 32)
| ((segments[6] as u128) << 16)
| (segments[7] as u128);
Self {
addr: addr_bits,
mlen: ipv6_mlen,
}
}
pub fn from_bytestring(bytestring: &[u8]) -> Result<Self, Error> {
match memchr(b'/', bytestring) {
Some(pos) => {
let addr = IpAddr::parse_ascii(&bytestring[0..pos]).map_err(|_| {
Error::InvalidAddr(
std::str::from_utf8(&bytestring[0..pos])
.unwrap()
.to_string(),
)
})?;
let mut mlen = 0;
for (i, byte) in bytestring[pos + 1..bytestring.len()]
.iter()
.rev()
.enumerate()
{
if *byte < 48 || *byte > 57 {
return Err(Error::InvalidBlock("Invalid1".to_string()));
}
mlen += (byte - 48) * 10u8.pow(i as u32);
}
Ok(Self::new(addr, mlen))
}
None => Err(Error::InvalidBlock(
std::str::from_utf8(bytestring).unwrap().to_string(),
)),
}
}
fn addr(&self) -> IpAddr {
addr_from_bits(self.addr)
}
pub fn start(&self) -> IpAddr {
let mask = 0xffff_ffff_ffff_ffff_ffff_ffff_ffff_ffff ^ ((1 << (128 - self.mlen)) - 1);
addr_from_bits(self.addr & mask)
}
pub fn end(&self) -> IpAddr {
let mask = !(0xffff_ffff_ffff_ffff_ffff_ffff_ffff_ffff ^ ((1 << (128 - self.mlen)) - 1));
addr_from_bits(self.addr | mask)
}
pub fn size(&self) -> u128 {
2u128.pow(128 - self.mlen as u32)
}
}
fn addr_from_bits(bits: u128) -> IpAddr {
if bits & 0xffff_ffff_ffff_ffff_ffff_ffff_0000_0000 == 0xffff_0000_0000 {
IpAddr::V4(Ipv4Addr::from((bits & 0xff_ff_ff_ff) as u32))
} else {
IpAddr::V6(Ipv6Addr::from(bits))
}
}
impl FromStr for Block {
type Err = Error;
fn from_str(s: &str) -> Result<Block, Error> {
let parts: Vec<&str> = s.splitn(2, '/').collect();
if parts.len() < 2 {
return Err(Error::InvalidBlock(s.to_string()));
}
let addr =
IpAddr::from_str(parts[0]).map_err(|_| Error::InvalidAddr(parts[0].to_string()))?;
let mlen = parts[1]
.parse::<u8>()
.map_err(|_| Error::InvalidMaskLength(parts[1].to_string()))?;
Ok(Self::new(addr, mlen))
}
}
impl fmt::Display for Block {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let addr = self.addr();
let mlen = if addr.is_ipv4() {
self.mlen - 96
} else {
self.mlen
};
write!(f, "{}/{}", addr, mlen)
}
}
impl fmt::Debug for Block {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let addr = self.addr();
let mlen = if addr.is_ipv4() {
self.mlen - 96
} else {
self.mlen
};
write!(f, "{}/{}", addr, mlen)
}
}
impl Ord for Block {
fn cmp(&self, other: &Self) -> Ordering {
(self.addr >> (BITCOUNT - self.mlen) as usize)
.cmp(&(other.addr >> ((BITCOUNT - other.mlen) % 32) as usize))
}
}
impl PartialEq for Block {
fn eq(&self, other: &Self) -> bool {
self.addr == other.addr && self.mlen == other.mlen
}
}
impl PartialOrd for Block {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(
(self.addr >> (BITCOUNT - self.mlen) as usize)
.cmp(&(other.addr >> ((BITCOUNT - other.mlen) % 32) as usize)),
)
}
}
impl Into<Vec<u8>> for Block {
fn into(self) -> Vec<u8> {
(&self).into()
}
}
impl Into<Vec<u8>> for &Block {
fn into(self) -> Vec<u8> {
self.to_string().into()
}
}
|
