simple_dns/dns/rdata/
afsdb.rs

1use std::collections::HashMap;
2
3use crate::{
4    bytes_buffer::BytesBuffer,
5    dns::{name::Label, Name, WireFormat},
6};
7
8use super::RR;
9
10/// AFSDB records represents servers with ASD cells
11#[derive(Debug, PartialEq, Eq, Hash, Clone)]
12pub struct AFSDB<'a> {
13    /// An integer that represents the subtype
14    pub subtype: u16,
15    /// A [name](`Name`) of a host that has a server for the cell named by the owner name of the RR
16    pub hostname: Name<'a>,
17}
18
19impl RR for AFSDB<'_> {
20    const TYPE_CODE: u16 = 18;
21}
22
23impl AFSDB<'_> {
24    /// Transforms the inner data into its owned type
25    pub fn into_owned<'b>(self) -> AFSDB<'b> {
26        AFSDB {
27            subtype: self.subtype,
28            hostname: self.hostname.into_owned(),
29        }
30    }
31}
32
33impl<'a> WireFormat<'a> for AFSDB<'a> {
34    const MINIMUM_LEN: usize = 2;
35
36    fn parse(data: &mut BytesBuffer<'a>) -> crate::Result<Self>
37    where
38        Self: Sized,
39    {
40        let subtype = data.get_u16()?;
41        let hostname = Name::parse(data)?;
42
43        Ok(Self { subtype, hostname })
44    }
45
46    fn write_to<T: std::io::Write>(&self, out: &mut T) -> crate::Result<()> {
47        out.write_all(&self.subtype.to_be_bytes())?;
48        self.hostname.write_to(out)
49    }
50
51    fn write_compressed_to<T: std::io::Write + std::io::Seek>(
52        &'a self,
53        out: &mut T,
54        name_refs: &mut HashMap<&'a [Label<'a>], usize>,
55    ) -> crate::Result<()> {
56        out.write_all(&self.subtype.to_be_bytes())?;
57        self.hostname.write_compressed_to(out, name_refs)
58    }
59
60    fn len(&self) -> usize {
61        self.hostname.len() + Self::MINIMUM_LEN
62    }
63}
64
65#[cfg(test)]
66mod tests {
67    use crate::{rdata::RData, ResourceRecord};
68
69    use super::*;
70
71    #[test]
72    fn parse_and_write_afsdb() {
73        let afsdb = AFSDB {
74            subtype: 1,
75            hostname: Name::new("e.hostname.com").unwrap(),
76        };
77
78        let mut data = Vec::new();
79        assert!(afsdb.write_to(&mut data).is_ok());
80
81        let afsdb = AFSDB::parse(&mut BytesBuffer::new(&data));
82        assert!(afsdb.is_ok());
83        let afsdb = afsdb.unwrap();
84
85        assert_eq!(data.len(), afsdb.len());
86        assert_eq!(1, afsdb.subtype);
87        assert_eq!("e.hostname.com", afsdb.hostname.to_string());
88    }
89
90    #[test]
91    fn parse_sample() -> Result<(), Box<dyn std::error::Error>> {
92        let sample_file = std::fs::read("samples/zonefile/AFSDB.sample")?;
93
94        let sample_rdata = match ResourceRecord::parse(&mut BytesBuffer::new(&sample_file))?.rdata {
95            RData::AFSDB(rdata) => rdata,
96            _ => unreachable!(),
97        };
98
99        assert_eq!(sample_rdata.subtype, 0);
100        assert_eq!(sample_rdata.hostname, "hostname.sample".try_into()?);
101        Ok(())
102    }
103}
simple_dns/dns/rdata/afsdb.rs

simple_dns/dns/rdata/
afsdb.rs
