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68 lines
2.6 KiB
Rust
68 lines
2.6 KiB
Rust
use std::env;
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use std::sync::{Arc, Mutex};
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#[allow(unused_imports)]
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use log::{debug, error, info, trace, warn, LevelFilter};
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use crate::blockchain::filter::BlockchainFilter;
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use crate::dns::context::{ResolveStrategy, ServerContext};
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use crate::dns::hosts::HostsFilter;
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use crate::dns::server::{DnsServer, DnsTcpServer, DnsUdpServer};
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use crate::{Context, Settings};
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/// Starts UDP and TCP DNS-servers
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pub fn start_dns_server(context: &Arc<Mutex<Context>>, settings: &Settings) {
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let server_context = create_server_context(Arc::clone(&context), &settings);
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if server_context.enable_udp {
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let udp_server = DnsUdpServer::new(Arc::clone(&server_context), settings.dns.threads);
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if let Err(e) = udp_server.run_server() {
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error!("Failed to bind UDP listener: {:?}", e);
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}
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}
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if server_context.enable_tcp {
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let tcp_server = DnsTcpServer::new(Arc::clone(&server_context), settings.dns.threads);
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if let Err(e) = tcp_server.run_server() {
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error!("Failed to bind TCP listener: {:?}", e);
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}
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}
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}
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/// Creates DNS-context with all needed settings
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fn create_server_context(context: Arc<Mutex<Context>>, settings: &Settings) -> Arc<ServerContext> {
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let mut server_context = ServerContext::new();
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server_context.allow_recursive = true;
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server_context.dns_listen = settings.dns.listen.clone();
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server_context.resolve_strategy = match settings.dns.forwarders.is_empty() {
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true => ResolveStrategy::Recursive,
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false => ResolveStrategy::Forward { upstreams: settings.dns.forwarders.clone() }
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};
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// Add host filters
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for host in &settings.dns.hosts {
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if host == "system" {
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if cfg!(target_os = "windows") {
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if let Ok(root) = env::var("SYSTEMROOT") {
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let filename = format!("{}{}", &root, "\\System32\\drivers\\etc\\hosts");
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debug!("Loading hosts from '{}'", &filename);
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server_context.filters.push(Box::new(HostsFilter::new(&filename)));
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}
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} else {
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let filename = "/etc/hosts";
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debug!("Loading hosts from '{}'", filename);
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server_context.filters.push(Box::new(HostsFilter::new(filename)));
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}
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} else {
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debug!("Loading hosts from '{}'", &host);
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server_context.filters.push(Box::new(HostsFilter::new(host)));
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}
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}
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server_context.filters.push(Box::new(BlockchainFilter::new(context)));
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match server_context.initialize() {
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Ok(_) => {}
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Err(e) => { panic!("DNS server failed to initialize: {:?}", e); }
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}
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Arc::new(server_context)
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}
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