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
extern crate alloc;
use alloc::boxed::Box;
use alloc::vec;
use alloc::vec::Vec;
use ross_protocol::packet::Packet;
use crate::extractor::{Extractor, ExtractorError};
use crate::filter::{Filter, FilterError};
use crate::serializer::{ConfigSerializer, ConfigSerializerError, Serialize, TryDeserialize};
use crate::state_manager::StateManager;
use crate::{serialize_integer_to_vec, try_deserialize_integer_from_vec};
#[derive(Debug)]
pub enum MatcherError {
ExtractorError(ExtractorError),
FilterError(FilterError),
}
#[derive(Debug)]
pub enum Matcher {
Single {
extractor: Box<dyn Extractor>,
filter: Box<dyn Filter>,
},
Not(Box<Matcher>),
Or(Box<Matcher>, Box<Matcher>),
And(Box<Matcher>, Box<Matcher>),
}
impl Matcher {
pub fn do_match(
&mut self,
packet: &Packet,
state_manager: &mut StateManager,
) -> Result<bool, MatcherError> {
match self {
Matcher::Single { extractor, filter } => {
let value = extractor
.extract(packet)
.map_err(|err| MatcherError::ExtractorError(err))?;
let result = filter
.filter(&value, state_manager)
.map_err(|err| MatcherError::FilterError(err))?;
Ok(result)
}
Matcher::Not(matcher) => Ok(!matcher.do_match(packet, state_manager)?),
Matcher::Or(matcher1, matcher2) => Ok(matcher1.do_match(packet, state_manager)?
|| matcher2.do_match(packet, state_manager)?),
Matcher::And(matcher1, matcher2) => Ok(matcher1.do_match(packet, state_manager)?
&& matcher2.do_match(packet, state_manager)?),
}
}
}
impl Serialize for Matcher {
fn serialize(&self) -> Vec<u8> {
match self {
Matcher::Single { extractor, filter } => {
let mut data = vec![0x00];
serialize_integer_to_vec!(data, extractor.get_code(), u16);
let mut extractor = extractor.serialize();
serialize_integer_to_vec!(data, extractor.len() as u8, u8);
data.append(&mut extractor);
serialize_integer_to_vec!(data, filter.get_code(), u16);
let mut filter = filter.serialize();
serialize_integer_to_vec!(data, filter.len() as u8, u8);
data.append(&mut filter);
data
}
Matcher::Not(matcher) => {
let mut data = vec![0x01];
let mut matcher = matcher.serialize();
serialize_integer_to_vec!(data, matcher.len() as u32, u32);
data.append(&mut matcher);
data
}
Matcher::Or(matcher1, matcher2) => {
let mut data = vec![0x02];
let mut matcher1 = matcher1.serialize();
serialize_integer_to_vec!(data, matcher1.len() as u32, u32);
data.append(&mut matcher1);
let mut matcher2 = matcher2.serialize();
serialize_integer_to_vec!(data, matcher2.len() as u32, u32);
data.append(&mut matcher2);
data
}
Matcher::And(matcher1, matcher2) => {
let mut data = vec![0x03];
let mut matcher1 = matcher1.serialize();
serialize_integer_to_vec!(data, matcher1.len() as u32, u32);
data.append(&mut matcher1);
let mut matcher2 = matcher2.serialize();
serialize_integer_to_vec!(data, matcher2.len() as u32, u32);
data.append(&mut matcher2);
data
}
}
}
}
impl TryDeserialize for Matcher {
fn try_deserialize(data: &[u8]) -> Result<Box<Self>, ConfigSerializerError> {
if data.len() < 2 {
return Err(ConfigSerializerError::WrongSize);
}
match data[0] {
0x00 => {
if data.len() < 7 {
return Err(ConfigSerializerError::WrongSize);
}
let mut offset = 1;
let extractor_code = try_deserialize_integer_from_vec!(data, offset, u16);
let extractor_len = try_deserialize_integer_from_vec!(data, offset, u8) as usize;
let extractor = ConfigSerializer::try_deserialize_extractor_from_vec(
&data[offset..offset + extractor_len],
extractor_code,
)?;
offset += extractor_len;
let filter_code = try_deserialize_integer_from_vec!(data, offset, u16);
let filter_len = try_deserialize_integer_from_vec!(data, offset, u8) as usize;
let filter = ConfigSerializer::try_deserialize_filter_from_vec(
&data[offset..offset + filter_len],
filter_code,
)?;
Ok(Box::new(Matcher::Single { extractor, filter }))
}
0x01 => {
if data.len() < 5 {
return Err(ConfigSerializerError::WrongSize);
}
let mut offset = 1;
let matcher_len = try_deserialize_integer_from_vec!(data, offset, u32) as usize;
let matcher = Matcher::try_deserialize(&data[offset..offset + matcher_len])?;
Ok(Box::new(Matcher::Not(matcher)))
}
0x02 => {
if data.len() < 9 {
return Err(ConfigSerializerError::WrongSize);
}
let mut offset = 1;
let matcher1_len = try_deserialize_integer_from_vec!(data, offset, u32) as usize;
let matcher1 = Matcher::try_deserialize(&data[offset..offset + matcher1_len])?;
offset += matcher1_len;
let matcher2_len = try_deserialize_integer_from_vec!(data, offset, u32) as usize;
let matcher2 = Matcher::try_deserialize(&data[offset..offset + matcher2_len])?;
Ok(Box::new(Matcher::Or(matcher1, matcher2)))
}
0x03 => {
if data.len() < 9 {
return Err(ConfigSerializerError::WrongSize);
}
let mut offset = 1;
let matcher1_len = try_deserialize_integer_from_vec!(data, offset, u32) as usize;
let matcher1 = Matcher::try_deserialize(&data[offset..offset + matcher1_len])?;
offset += matcher1_len;
let matcher2_len = try_deserialize_integer_from_vec!(data, offset, u32) as usize;
let matcher2 = Matcher::try_deserialize(&data[offset..offset + matcher2_len])?;
Ok(Box::new(Matcher::And(matcher1, matcher2)))
}
_ => Err(ConfigSerializerError::UnknownEnumVariant),
}
}
}