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
use std::fmt;
use std::net::Ipv4Addr;
use crate::error::*;
use crate::packet::{Packet as P, PacketMut as PM, AsPacket, AsPacketMut};
use crate::size;
use crate::ip;
use crate::icmp::Kind;
pub struct Packet<B> {
buffer: B,
}
sized!(Packet,
header {
min: 8,
max: 8,
size: 8,
}
payload {
min: <ip::v4::Packet<()> as size::header::Min>::min(),
max: <ip::v4::Packet<()> as size::header::Max>::max(),
size: p => {
if let Ok(ip) = p.packet() {
size::header::Size::size(&ip)
}
else {
p.buffer.as_ref().len() - 8
}
},
});
impl<B: AsRef<[u8]>> fmt::Debug for Packet<B> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("icmp::redirect_message::Packet")
.field("gateway", &self.gateway())
.field("packet", &self.packet())
.finish()
}
}
impl<B: AsRef<[u8]>> Packet<B> {
pub fn unchecked(buffer: B) -> Packet<B> {
Packet { buffer }
}
pub fn new(buffer: B) -> Result<Packet<B>> {
use crate::size::header::Min;
let packet = Packet::unchecked(buffer);
if packet.buffer.as_ref().len() < Self::min() {
Err(Error::SmallBuffer)?
}
match Kind::from(packet.buffer.as_ref()[0]) {
Kind::RedirectMessage =>
(),
_ =>
Err(Error::InvalidPacket)?
}
Ok(packet)
}
}
impl<B: AsRef<[u8]>> Packet<B> {
pub fn to_owned(&self) -> Packet<Vec<u8>> {
Packet::unchecked(self.buffer.as_ref().to_vec())
}
}
impl<B: AsRef<[u8]>> AsRef<[u8]> for Packet<B> {
fn as_ref(&self) -> &[u8] {
use crate::size::Size;
&self.buffer.as_ref()[.. self.size()]
}
}
impl<B: AsRef<[u8]> + AsMut<[u8]>> AsMut<[u8]> for Packet<B> {
fn as_mut(&mut self) -> &mut [u8] {
use crate::size::Size;
let size = self.size();
&mut self.buffer.as_mut()[.. size]
}
}
impl<'a, B: AsRef<[u8]>> AsPacket<'a, Packet<&'a [u8]>> for B {
fn as_packet(&self) -> Result<Packet<&[u8]>> {
Packet::new(self.as_ref())
}
}
impl<'a, B: AsRef<[u8]> + AsMut<[u8]>> AsPacketMut<'a, Packet<&'a mut [u8]>> for B {
fn as_packet_mut(&mut self) -> Result<Packet<&mut [u8]>> {
Packet::new(self.as_mut())
}
}
impl<B: AsRef<[u8]>> P for Packet<B> {
fn split(&self) -> (&[u8], &[u8]) {
self.buffer.as_ref().split_at(8)
}
}
impl<B: AsRef<[u8]> + AsMut<[u8]>> PM for Packet<B> {
fn split_mut(&mut self) -> (&mut [u8], &mut [u8]) {
self.buffer.as_mut().split_at_mut(8)
}
}
impl<B: AsRef<[u8]>> Packet<B> {
pub fn gateway(&self) -> Ipv4Addr {
Ipv4Addr::new(
self.buffer.as_ref()[4],
self.buffer.as_ref()[5],
self.buffer.as_ref()[6],
self.buffer.as_ref()[7])
}
pub fn packet(&self) -> Result<ip::v4::Packet<&[u8]>> {
ip::v4::Packet::new(&self.buffer.as_ref()[8 ..])
}
}