DNS SOA record fields set failure about libtins HOT 7 CLOSED

@mfontanini

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SOA records are not parsed, but you should still be able to perform a record.data() and get the binary representation of the data. Is this giving you wrong results?

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I am trying to craft and i cannot craft because of that reasons… many libraries implemented this also inplemented in programming language level…

Mahmut Bulut

On 20 Jan 2015, at 21:54, Matias Fontanini [email protected] wrote:

SOA records are not parsed, but you should still be able to perform a record.data() and get the binary representation of the data. Is this giving you wrong results?

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Yes, this should be implemented. I'll add this when I have some time.

Sorry for the inconvenience

On Tue, Jan 20, 2015 at 3:17 PM, Mahmut Bulut [email protected]
wrote:

I am trying to craft and i cannot craft because of that reasons… many
libraries implemented this also inplemented in programming language level…

---

Mahmut Bulut

On 20 Jan 2015, at 21:54, Matias Fontanini [email protected]
wrote:

SOA records are not parsed, but you should still be able to perform a
record.data() and get the binary representation of the data. Is this giving
you wrong results?

—
Reply to this email directly or view it on GitHub.

—
Reply to this email directly or view it on GitHub
#48 (comment).

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I needed the same earlier today and wrote this code to encode strings like "ns.example.com. hostmaster.example.com. 2003080800 1d 15m 3w 2h". The encoded string can be passed to libtins in the resource record. Works well for my needs.

int parse_time(std::string time_str)
{
    static std::map<char, int> secs { {'s', 1}, { 'm', 60 }, { 'h',3600 }, { 'd',86400 }, { 'w',604800 }};

    char unit = ::tolower(time_str.back());
    if (secs.find(unit) != secs.end())
    {
        time_str.erase(time_str.end() - 1);
        return std::stoi(time_str) * secs[unit];
    }
    return std::stoi(time_str);
}

string encode_soa_data(const string& soa_string)
{
    byte_array bytes;
    std::istringstream iss(soa_string);
    std::string value;

    // add mname and rname
    for (int i = 0; i < 2; ++i)
    {
        iss >> value;
        if (value.back() == '.')
            value.erase(value.end() - 1);

        std::string encoded_value = DNS::encode_domain_name(value);
        bytes.insert(bytes.end(), encoded_value.begin(), encoded_value.end());
    }
    int added = bytes.size();

    // prepare memory for time integers
    bytes.insert(bytes.end(), sizeof(uint32_t) * 5, 0);

    // add times
    for (int i = 0; i < 5; ++i)
    {
        iss >> value;
        uint32_t encoded_int = Endian::host_to_be(parse_time(value));
        std::memcpy(bytes.data() + added, &encoded_int, sizeof(uint32_t));
        added += sizeof(uint32_t);
    }

    return std::string(bytes.begin(), bytes.end());
}

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Okay, I added this to the develop branch. Note that I also changed some names, like DNS::Query is now DNS::query, DNS::Resource is DNS::resource and DNS::query::type is not DNS::query::query_type (so it's uniform with query_class). I added a typedef so Query still exists (and type() also), but they're both deprecated, so you will probably get some warnings from your compiler.

See the DNS::soa_record in dns.h to read the documentation on it.

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@mfontanini nice to hear that, thanks

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