domain 0.7.1

A DNS library for Rust.
Documentation 
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

//! Signs a zone file.

use std::io;
use std::fs::File;
use bytes::Bytes;
use domain_core::name::Dname;
use domain_core::rdata::MasterRecordData;
use domain_core::master::reader::{Reader, ReaderItem};
use domain_core::record::Record;
use domain_core::serial::Serial;
use domain_sign::ring;
use domain_sign::sign::{FamilyName, SortedRecords};
use ::ring::rand::SystemRandom;
use unwrap::unwrap;


fn main() {
    let mut args = std::env::args();
    let _ = unwrap!(args.next());
    let infile = match args.next() {
        Some(infile) => infile,
        None => {
            eprintln!("Usage: signzone <infile> [<outfile>]");
            std::process::exit(1)
        }
    };
    let outfile = args.next();

    if let Err(err) = sign_zone(infile, outfile) {
        eprintln!("{}", err);
        std::process::exit(1)
    }
        
}


type Records = SortedRecords<Dname<Bytes>, MasterRecordData<Bytes, Dname<Bytes>>>;


fn sign_zone(infile: String, outfile: Option<String>) -> Result<(), io::Error> {
    let rng = SystemRandom::new();
    let key = match ring::Key::throwaway_13(256, &rng) {
        Ok(key) => key,
        Err(_) => {
            return Err(io::Error::new(
                io::ErrorKind::Other,
                "failed to create key"
            ))
        }
    };
    let mut records = load_zone(infile)?;
    let (apex, ttl) = find_apex(&records)?;
    let nsecs = records.nsecs(&apex, ttl);
    records.extend(nsecs.into_iter().map(Record::from_record));
    match apex.dnskey(ttl, &key) {
        Ok(record) => {
            let _ = records.insert(Record::from_record(record));
        }
        Err(_) => {
            return Err(io::Error::new(
                io::ErrorKind::Other,
                "Creating DNSKEY record failed."
            ))
        }
    }
    let inception = Serial::now().sub(10);
    let expiration = inception.add(2592000); // XXX 30 days
    let rrsigs = match records.sign(&apex, expiration, inception, &key) {
        Ok(rrsigs) => rrsigs,
        Err(_) => {
            return Err(io::Error::new(
                io::ErrorKind::Other,
                "Signing failed."
            ))
        }
    };
    records.extend(rrsigs.into_iter().map(Record::from_record));
    let _ds = match apex.ds(ttl, key) {
        Ok(ds) => ds,
        Err(_) => {
            return Err(io::Error::new(
                io::ErrorKind::Other,
                "Creating DS record failed."
            ))
        }
    };

    match outfile {
        Some(path) => {
            let mut file = File::create(path)?;
            records.write(&mut file)?;
        }
        None => {
            {
                let stdout = io::stdout();
                let mut stdout = stdout.lock();
                records.write(&mut stdout)?;
            }
            println!("");
        }
    }
    //println!("{}", ds);
    Ok(())
}


fn load_zone(infile: String) -> Result<Records, io::Error> {
    let reader = Reader::open(infile)?;
    let mut res = SortedRecords::new();
    for item in reader {
        match item {
            Ok(ReaderItem::Record(record)) => {
                let _ = res.insert(record);
            }
            Ok(ReaderItem::Include {..}) => {
                return Err(io::Error::new(
                    io::ErrorKind::Other,
                    "$include not supported"
                ))
            }
            Ok(ReaderItem::Control {name, ..}) => {
                return Err(io::Error::new(
                    io::ErrorKind::Other,
                    format!("${} not supported", name)
                ))
            }
            Err(err) => {
                return Err(io::Error::new(
                    io::ErrorKind::Other,
                    format!("{}", err)
                ))
            }
        }
    }
    Ok(res)
}

fn find_apex(
    records: &Records
) -> Result<(FamilyName<Dname<Bytes>>, u32), io::Error> {
    let soa = match records.find_soa() {
        Some(soa) => soa,
        None => {
            return Err(io::Error::new(
                io::ErrorKind::Other,
                "cannot find SOA record"
            ))
        }
    };
    let ttl = match *soa.first().data() {
        MasterRecordData::Soa(ref soa) => soa.minimum(),
        _ => unreachable!()
    };
    Ok((soa.family_name().cloned(), ttl))
}