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77 lines
2.6 KiB
77 lines
2.6 KiB
use hickory_proto::{
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op::{Message, MessageType, ResponseCode},
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rr::{record_type::RecordType, Name, RData, Record},
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};
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use std::{net::IpAddr, str::FromStr};
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pub fn build_dns_response(mut request: Message, domain: &str, ip: IpAddr, ttl: u32) -> Result<Message, String> {
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let record = match ip {
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IpAddr::V4(ip) => {
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let mut record = Record::with(Name::from_str(domain)?, RecordType::A, ttl);
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record.set_data(Some(RData::A(ip.into())));
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record
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}
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IpAddr::V6(ip) => {
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let mut record = Record::with(Name::from_str(domain)?, RecordType::AAAA, ttl);
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record.set_data(Some(RData::AAAA(ip.into())));
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record
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}
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};
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// We must indicate that this message is a response. Otherwise, implementations may not
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// recognize it.
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request.set_message_type(MessageType::Response);
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request.add_answer(record);
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Ok(request)
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}
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pub fn remove_ipv6_entries(message: &mut Message) {
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message
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.answers_mut()
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.retain(|answer| !matches!(answer.data(), Some(RData::AAAA(_))));
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}
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pub fn extract_ipaddr_from_dns_message(message: &Message) -> Result<IpAddr, String> {
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if message.response_code() != ResponseCode::NoError {
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return Err(format!("{:?}", message.response_code()));
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}
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let mut cname = None;
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for answer in message.answers() {
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match answer.data().ok_or("DNS response not contains answer data")? {
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RData::A(addr) => {
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return Ok(IpAddr::V4((*addr).into()));
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}
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RData::AAAA(addr) => {
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return Ok(IpAddr::V6((*addr).into()));
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}
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RData::CNAME(name) => {
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cname = Some(name.to_utf8());
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}
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_ => {}
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}
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}
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if let Some(cname) = cname {
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return Err(cname);
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}
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Err(format!("{:?}", message.answers()))
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}
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pub fn extract_domain_from_dns_message(message: &Message) -> Result<String, String> {
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let query = message.queries().first().ok_or("DnsRequest no query body")?;
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let name = query.name().to_string();
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Ok(name)
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}
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pub fn parse_data_to_dns_message(data: &[u8], used_by_tcp: bool) -> Result<Message, String> {
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if used_by_tcp {
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if data.len() < 2 {
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return Err("invalid dns data".into());
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}
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let len = u16::from_be_bytes([data[0], data[1]]) as usize;
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let data = data.get(2..len + 2).ok_or("invalid dns data")?;
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return parse_data_to_dns_message(data, false);
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}
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let message = Message::from_vec(data).map_err(|e| e.to_string())?;
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Ok(message)
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}
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