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use std::fmt::{Display, Formatter}; use std::net::{IpAddr, Ipv6Addr}; use std::{fmt, io}; use dns_lookup::{getaddrinfo, LookupErrorKind}; use thiserror::Error; use crate::dbus::lookup_dbus; use crate::DnsCheckError::{NoDBus, NoResolved}; #[cfg(all(feature = "dbus", target_os = "linux"))] mod dbus; #[derive(Debug, Copy, Clone)] pub enum Query<'a> { Address(IpAddr), Domain(&'a str), } impl Display for Query<'_> { fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result { match self { Query::Address(addr) => { write!(f, "{}", addr) } Query::Domain(domain) => { write!(f, "{}", domain) } } } } #[derive(Error, Debug)] pub enum DnsCheckError { #[error("DBus reported {0}: {1}")] DBus(String, String), #[error("DBus support is missing")] NoDBus, #[error("systemd-resolved not found: {0}")] NoResolved(#[source] anyhow::Error), #[error("NXDOMAIN {0}")] NxDomain(String), #[error("Something went wrong: {0}")] Unknown(#[from] anyhow::Error), } impl From<io::Error> for DnsCheckError { fn from(e: io::Error) -> Self { DnsCheckError::Unknown(e.into()) } } pub struct DnsListMembership { pub name: String, pub list: String, pub found: bool, } #[derive(Debug, Copy, Clone, Eq, PartialEq)] pub enum Output { Quiet, Normal, Verbose, } pub fn lookup( source: &str, query: &Query, output: &Output, ) -> Result<DnsListMembership, DnsCheckError> { match lookup_dbus(source, query, output) { Ok(r) => return Ok(r), Err(NoDBus) => { if output == &Output::Verbose { eprintln!("DBus not compiled in, falling back to internal resolution") } } Err(NoResolved(e)) => { if output == &Output::Verbose { eprintln!("DBus resolution failed: {:?}", e) } } Err(e) => return Err(e), }; lookup_dns(source, query, output) } fn lookup_dns( source: &str, query: &Query, _output: &Output, ) -> Result<DnsListMembership, DnsCheckError> { let queryhost = match query { Query::Domain(d) => format!("{}.", d), Query::Address(ip) => format_ip(&ip), }; let hostname = format!("{}{}.", queryhost, source); let mut addrinfo = match getaddrinfo(Some(&hostname), None, None) { Ok(a) => Ok(a), Err(e) => match e.kind() { LookupErrorKind::NoName => { return Ok(DnsListMembership { name: query.to_string(), list: format!("{:?}", source), found: false, }) } _ => Err(DnsCheckError::Unknown(io::Error::from(e).into())), }, }?; Ok(DnsListMembership { name: source.to_string(), list: format!("{}", query), found: addrinfo.next().is_some(), }) } #[cfg(not(all(feature = "dbus", target_os = "linux")))] mod dbus { use crate::DnsCheckError::NoDBus; use crate::{DnsCheckError, DnsListMembership, Output, Query}; pub fn lookup_dbus(_: &str, _: &Query, _: &Output) -> Result<DnsListMembership, DnsCheckError> { Err(NoDBus) } } fn format_ip(ip: &IpAddr) -> String { match ip { IpAddr::V4(v4) => format!( "{}.{}.{}.{}.", v4.octets()[3], v4.octets()[2], v4.octets()[1], v4.octets()[0] ), IpAddr::V6(v6) => format_v6(v6), } } fn format_v6(ip: &Ipv6Addr) -> String { ip.octets() .iter() .flat_map(|o| vec![o >> 4, o & 0xF]) .map(|d| format!("{:x}", d)) .fold("".to_owned(), |a: String, d: String| format!("{}.{}", d, a)) } pub fn count_lists( queries: &[Query], sources: &[&str], output: Output, ) -> Result<Vec<DnsListMembership>, DnsCheckError> { queries .iter() .flat_map(|query| { sources .iter() .map(move |&source| lookup(source, query, &output)) }) .collect() }