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12
Cargo.toml Normal file
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[package]
name = "ipinfo"
version = "0.1.0"
edition = "2021"
[dependencies]
cidr = "0.2"
anyhow = "1.0"
trust-dns-server = "0.22"
tokio = { version = "1.28", features = ["macros", "net", "io-util", "rt"] }
async-trait = "0.1"

17
README.md Normal file
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# ipinfo
A tool to provide ipinfo over DNS, similar to [team cymrus IP to
ASN mapping](https://www.team-cymru.com/ip-asn-mapping) for dn42.
With this, ASNs can be provided to MTR for example by setting it as
a custom ipinfo server.
### Configuration
Configuration is done over enviromental variables. Available options:
- REGISTRY: path to registry repository (default: `./registry`)
- DOMAIN: base domain eg. `ip.catgirls.dn42.` (notice the trailing dot)
- BIND: IP to bind to (default: `::`)
- PORT: port to bind to (default: `53`)

169
src/dns.rs Normal file
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use crate::registry::{Entry, Registry};
use std::net::{IpAddr, SocketAddr};
use tokio::net::UdpSocket;
use trust_dns_server::server::ResponseInfo;
use trust_dns_server::{
authority::MessageResponseBuilder,
proto::{
op::{Header, MessageType, OpCode},
rr::{rdata::TXT, RData, Record, RecordType},
},
server::{RequestHandler, ResponseHandler},
ServerFuture,
};
use trust_dns_server::{proto::op::ResponseCode, server::Request};
pub struct Handler {
server: ServerFuture<LookupHandler>,
}
pub struct LookupHandler {
registry: Vec<Entry>,
domain: String,
}
impl Handler {
pub async fn new(ip: IpAddr, port: u16, registry: Vec<Entry>, domain: String) -> anyhow::Result<Self> {
let socket = UdpSocket::bind(SocketAddr::new(ip, port)).await?;
let handler = LookupHandler::new(registry, domain);
let mut server = ServerFuture::new(handler);
server.register_socket(socket);
Ok(Self { server })
}
pub async fn handle(self) -> anyhow::Result<()> {
self.server.block_until_done().await?;
Ok(())
}
}
impl LookupHandler {
pub fn new(registry: Vec<Entry>, domain: String) -> Self {
Self { registry, domain }
}
pub async fn do_txt_lookup<R: ResponseHandler>(
&self,
request: &Request,
mut responder: R,
) -> anyhow::Result<ResponseInfo> {
let domain = request.query().name().to_string();
if let Some(query) = domain.strip_suffix(&self.domain) {
println!("{query}");
let builder = MessageResponseBuilder::from_message_request(request);
let mut header = Header::response_from_request(request.header());
header.set_authoritative(true);
if let Some(asn) = query.strip_prefix("as") {
let asn = asn.parse()?;
if let Some(entry) = Registry::get_by_asn(&self.registry, asn) {
let rdata = RData::TXT(TXT::new(vec![entry]));
let records = vec![Record::from_rdata(request.query().name().into(), 0, rdata)];
let response = builder.build(header, records.iter(), &[], &[], &[]);
Ok(responder.send_response(response).await?)
} else {
self.do_nxdomain(request, responder).await
}
} else {
let parts: Vec<&str> = query.split('.').rev().collect();
let mut addr = String::new();
if parts.len() == 4 {
for octet in parts {
addr.push_str(octet);
addr.push('.');
}
addr = addr.strip_suffix('.').unwrap().to_string();
} else {
let mut count = 0;
let mut octets = 0;
for part in parts {
addr.push_str(part);
count += 1;
if count >= 4 {
addr.push(':');
count = 0;
octets += 1;
}
}
for _ in octets..8 {
addr.push_str("0:");
}
addr = addr.strip_suffix(':').unwrap().to_string();
}
let addr = addr.parse()?;
if let Some(entry) = match addr {
IpAddr::V4(v4) => Registry::get_by_ipv4(&self.registry, v4),
IpAddr::V6(v6) => Registry::get_by_ipv6(&self.registry, &v6),
} {
let rdata = RData::TXT(TXT::new(vec![entry]));
let records = vec![Record::from_rdata(request.query().name().into(), 0, rdata)];
let response = builder.build(header, records.iter(), &[], &[], &[]);
Ok(responder.send_response(response).await?)
} else {
self.do_nxdomain(request, responder).await
}
}
} else {
self.do_nxdomain(request, responder).await
}
}
pub async fn do_nxdomain<R: ResponseHandler>(
&self,
request: &Request,
mut responder: R,
) -> anyhow::Result<ResponseInfo> {
let record_type = request.query().query_type();
let domain = request.query().name();
println!("{domain}: {record_type}");
let builder = MessageResponseBuilder::from_message_request(request);
let mut header = Header::response_from_request(request.header());
header.set_authoritative(true);
header.set_response_code(ResponseCode::NXDomain);
let response = builder.build_no_records(header);
Ok(responder.send_response(response).await?)
}
pub async fn do_lookup<R: ResponseHandler>(
&self,
request: &Request,
responder: R,
) -> anyhow::Result<ResponseInfo> {
if request.op_code() != OpCode::Query {
anyhow::bail!("Invalid OpCode: {}", request.op_code());
}
if request.message_type() != MessageType::Query {
anyhow::bail!("Invalid message type: {}", request.message_type());
}
match request.query().query_type() {
RecordType::TXT => self.do_txt_lookup(request, responder).await,
_ => self.do_nxdomain(request, responder).await,
}
}
}
#[async_trait::async_trait]
impl RequestHandler for LookupHandler {
async fn handle_request<R: ResponseHandler>(
&self,
request: &Request,
response: R,
) -> ResponseInfo {
match self.do_lookup(request, response).await {
Ok(info) => info,
Err(e) => {
println!("{e}");
let mut header = Header::new();
header.set_response_code(trust_dns_server::proto::op::ResponseCode::ServFail);
header.into()
}
}
}
}

25
src/main.rs Normal file
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mod dns;
mod registry;
#[tokio::main(flavor = "current_thread")]
async fn main() -> anyhow::Result<()> {
let path = std::env::var("REGISTRY").unwrap_or("registry".to_string());
let domain = std::env::var("DOMAIN");
let ip = std::env::var("BIND").unwrap_or("::".to_string());
let port = std::env::var("PORT").unwrap_or("53".to_string());
if domain.is_err() {
anyhow::bail!("DOMAIN env var is not set");
}
let ip = ip.parse()?;
let port = port.parse()?;
let registry = registry::Registry::new(path);
let registry_index = registry.index()?;
let dns = dns::Handler::new(ip, port, registry_index, domain?).await?;
dns.handle().await?;
Ok(())
}

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src/registry.rs Normal file
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use cidr::{Ipv4Inet, Ipv6Inet};
use std::net::{Ipv4Addr, Ipv6Addr};
static AS_PATH: &str = "data/aut-num";
static INETNUM: &str = "data/inetnum";
static INET6NUM: &str = "data/inet6num";
pub struct Registry {
path: String,
}
impl Registry {
pub fn new(path: String) -> Self {
Self { path }
}
pub fn index(self) -> anyhow::Result<Vec<Entry>> {
let mut ret = Vec::new();
let aut_num = std::fs::read_dir(format!("{}/{AS_PATH}", self.path))?;
for aut_num in aut_num {
let content = std::fs::read_to_string(aut_num?.path())?;
let lines = content.lines();
let mut asn = None;
let mut mnt = None;
for line in lines {
if line.starts_with("aut-num:") {
let line = line
.strip_prefix("aut-num:")
.unwrap()
.trim()
.strip_prefix("AS")
.unwrap();
asn = Some(line.parse()?);
} else if line.starts_with("mnt-by:") {
let line = line.strip_prefix("mnt-by:").unwrap().trim();
mnt = Some(line.to_string());
}
}
let entry = Entry {
asn: asn.unwrap(),
mnt: mnt.unwrap(),
ipv4: None,
ipv6: None,
};
ret.push(entry);
}
let inetnum = std::fs::read_dir(format!("{}/{INETNUM}", self.path))?;
for inetnum in inetnum {
let content = std::fs::read_to_string(inetnum?.path())?;
let lines = content.lines().rev();
let mut entry = None;
let mut ip = None;
for line in lines {
if line.starts_with("mnt-by:") {
let line = line.strip_prefix("mnt-by:").unwrap().trim();
entry = Self::get_by_mnt(&mut ret, line);
} else if line.starts_with("cidr:") {
let line = line.strip_prefix("cidr:").unwrap().trim();
ip = Some(line);
}
}
if let Some(ip) = ip {
let (ip, len) = ip.split_once('/').unwrap();
let ipv4 = Ipv4Inet::new(ip.parse()?, len.parse()?)?;
if let Some(entry) = entry {
if let Some(vec) = entry.ipv4.as_mut() {
vec.push(ipv4);
} else {
entry.ipv4 = Some(vec![ipv4]);
}
}
}
}
let inet6num = std::fs::read_dir(format!("{}/{INET6NUM}", self.path))?;
for inet6num in inet6num {
let content = std::fs::read_to_string(inet6num?.path())?;
let lines = content.lines().rev();
let mut entry = None;
let mut ip = None;
for line in lines {
if line.starts_with("mnt-by:") {
let line = line.strip_prefix("mnt-by:").unwrap().trim();
entry = Self::get_by_mnt(&mut ret, line);
} else if line.starts_with("cidr:") {
let line = line.strip_prefix("cidr:").unwrap().trim();
ip = Some(line);
}
}
if let Some(ip) = ip {
let (ip, len) = ip.split_once('/').unwrap();
let ipv6 = Ipv6Inet::new(ip.parse()?, len.parse()?)?;
if let Some(entry) = entry {
if let Some(vec) = entry.ipv6.as_mut() {
vec.push(ipv6);
} else {
entry.ipv6 = Some(vec![ipv6]);
}
}
}
}
Ok(ret)
}
// Mmmm, O(len)
pub fn get_by_mnt<'a>(vec: &'a mut Vec<Entry>, mnt: &'a str) -> Option<&'a mut Entry> {
let mut ret = None;
for entry in vec {
if entry.mnt == mnt {
ret = Some(entry);
}
}
ret
}
pub fn get_by_asn(vec: &Vec<Entry>, asn: u32) -> Option<String> {
for entry in vec {
if entry.asn == asn {
return Some(entry.asn_req(asn));
}
}
None
}
// O(len + len)
pub fn get_by_ipv4(vec: &Vec<Entry>, addr: Ipv4Addr) -> Option<String> {
for entry in vec {
if let Some(ipv4) = &entry.ipv4 {
for ip in ipv4 {
if ip.contains(&addr) {
return entry.ipv4_req(*ip, addr);
}
}
}
}
None
}
pub fn get_by_ipv6(vec: &Vec<Entry>, addr: &Ipv6Addr) -> Option<String> {
for entry in vec {
if let Some(ipv6) = &entry.ipv6 {
for ip in ipv6 {
if ip.contains(addr) {
return entry.ipv6_req(*ip, addr);
}
}
}
}
None
}
}
pub struct Entry {
pub asn: u32,
pub mnt: String,
pub ipv4: Option<Vec<Ipv4Inet>>,
pub ipv6: Option<Vec<Ipv6Inet>>,
}
impl Entry {
pub fn ipv4_req(&self, ipv4: Ipv4Inet, addr: Ipv4Addr) -> Option<String> {
let asn_subnets = self.ipv4.as_ref()?;
let mut subnet = None;
for prefix in asn_subnets {
if prefix.contains(&ipv4.address()) {
subnet = Some(prefix);
break;
}
}
let subnet = subnet?;
let mut builder = String::new();
builder.push_str(&format!("{} | ", self.asn));
builder.push_str(&format!("{} | ", addr.to_string()));
builder.push_str(&format!("{} | ", subnet.to_string()));
builder.push_str(&format!("{}", self.mnt));
Some(builder)
}
pub fn ipv6_req(&self, ipv6: Ipv6Inet, addr: &Ipv6Addr) -> Option<String> {
let asn_subnets = self.ipv6.as_ref()?;
let mut subnet = None;
for prefix in asn_subnets {
if prefix.contains(&ipv6.address()) {
subnet = Some(prefix);
break;
}
}
let subnet = subnet?;
let mut builder = String::new();
builder.push_str(&format!("{} | ", self.asn));
builder.push_str(&format!("{} | ", addr.to_string()));
builder.push_str(&format!("{} | ", subnet.network().to_string()));
builder.push_str(&format!("{}", self.mnt));
Some(builder)
}
pub fn asn_req(&self, asn: u32) -> String {
let mut builder = String::new();
builder.push_str(&format!("{asn} "));
if let Some(ipv4_subnet) = &self.ipv4 {
for prefix in ipv4_subnet {
builder.push_str(&format!("| {} ", prefix.network().to_string()));
}
}
if let Some(ipv6_subnet) = &self.ipv6 {
for prefix in ipv6_subnet {
builder.push_str(&format!("| {} ", prefix.network().to_string()));
}
}
builder.push_str(&format!("| {}", self.mnt));
builder
}
}