516 lines
13 KiB
Go
516 lines
13 KiB
Go
package home
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import (
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"fmt"
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"net"
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"net/netip"
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"net/url"
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"os"
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"path/filepath"
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"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
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"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
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"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
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"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
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"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
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"github.com/AdguardTeam/AdGuardHome/internal/filtering"
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"github.com/AdguardTeam/AdGuardHome/internal/querylog"
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"github.com/AdguardTeam/AdGuardHome/internal/stats"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/golibs/errors"
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"github.com/AdguardTeam/golibs/log"
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"github.com/AdguardTeam/golibs/netutil"
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"github.com/ameshkov/dnscrypt/v2"
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yaml "gopkg.in/yaml.v3"
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)
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// Default ports.
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const (
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defaultPortDNS = 53
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defaultPortHTTP = 80
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defaultPortHTTPS = 443
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defaultPortQUIC = 853
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defaultPortTLS = 853
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)
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// Called by other modules when configuration is changed
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func onConfigModified() {
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err := config.write()
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if err != nil {
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log.Error("writing config: %s", err)
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}
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}
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// initDNS updates all the fields of the [Context] needed to initialize the DNS
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// server and initializes it at last. It also must not be called unless
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// [config] and [Context] are initialized.
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func initDNS() (err error) {
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baseDir := Context.getDataDir()
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anonymizer := config.anonymizer()
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statsConf := stats.Config{
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Filename: filepath.Join(baseDir, "stats.db"),
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LimitDays: config.DNS.StatsInterval,
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ConfigModified: onConfigModified,
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HTTPRegister: httpRegister,
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}
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Context.stats, err = stats.New(statsConf)
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if err != nil {
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return fmt.Errorf("init stats: %w", err)
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}
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conf := querylog.Config{
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Anonymizer: anonymizer,
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ConfigModified: onConfigModified,
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HTTPRegister: httpRegister,
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FindClient: Context.clients.findMultiple,
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BaseDir: baseDir,
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RotationIvl: config.DNS.QueryLogInterval.Duration,
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MemSize: config.DNS.QueryLogMemSize,
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Enabled: config.DNS.QueryLogEnabled,
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FileEnabled: config.DNS.QueryLogFileEnabled,
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AnonymizeClientIP: config.DNS.AnonymizeClientIP,
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}
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Context.queryLog = querylog.New(conf)
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Context.filters, err = filtering.New(config.DNS.DnsfilterConf, nil)
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if err != nil {
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// Don't wrap the error, since it's informative enough as is.
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return err
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}
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tlsConf := &tlsConfigSettings{}
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Context.tls.WriteDiskConfig(tlsConf)
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return initDNSServer(
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Context.filters,
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Context.stats,
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Context.queryLog,
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Context.dhcpServer,
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anonymizer,
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httpRegister,
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tlsConf,
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)
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}
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// initDNSServer initializes the [context.dnsServer]. To only use the internal
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// proxy, none of the arguments are required, but tlsConf still must not be nil,
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// in other cases all the arguments also must not be nil. It also must not be
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// called unless [config] and [Context] are initialized.
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func initDNSServer(
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filters *filtering.DNSFilter,
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sts stats.Interface,
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qlog querylog.QueryLog,
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dhcpSrv dhcpd.Interface,
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anonymizer *aghnet.IPMut,
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httpReg aghhttp.RegisterFunc,
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tlsConf *tlsConfigSettings,
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) (err error) {
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privateNets, err := parseSubnetSet(config.DNS.PrivateNets)
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if err != nil {
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return fmt.Errorf("preparing set of private subnets: %w", err)
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}
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p := dnsforward.DNSCreateParams{
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DNSFilter: filters,
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Stats: sts,
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QueryLog: qlog,
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PrivateNets: privateNets,
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Anonymizer: anonymizer,
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LocalDomain: config.DHCP.LocalDomainName,
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DHCPServer: dhcpSrv,
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}
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Context.dnsServer, err = dnsforward.NewServer(p)
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if err != nil {
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closeDNSServer()
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return fmt.Errorf("dnsforward.NewServer: %w", err)
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}
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Context.clients.dnsServer = Context.dnsServer
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dnsConf, err := generateServerConfig(tlsConf, httpReg)
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if err != nil {
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closeDNSServer()
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return fmt.Errorf("generateServerConfig: %w", err)
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}
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err = Context.dnsServer.Prepare(&dnsConf)
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if err != nil {
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closeDNSServer()
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return fmt.Errorf("dnsServer.Prepare: %w", err)
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}
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if config.Clients.Sources.RDNS {
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Context.rdns = NewRDNS(Context.dnsServer, &Context.clients, config.DNS.UsePrivateRDNS)
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}
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if config.Clients.Sources.WHOIS {
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Context.whois = initWHOIS(&Context.clients)
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}
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return nil
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}
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// parseSubnetSet parses a slice of subnets. If the slice is empty, it returns
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// a subnet set that matches all locally served networks, see
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// [netutil.IsLocallyServed].
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func parseSubnetSet(nets []string) (s netutil.SubnetSet, err error) {
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switch len(nets) {
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case 0:
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// Use an optimized function-based matcher.
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return netutil.SubnetSetFunc(netutil.IsLocallyServed), nil
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case 1:
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s, err = netutil.ParseSubnet(nets[0])
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if err != nil {
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return nil, err
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}
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return s, nil
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default:
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var nets []*net.IPNet
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nets, err = netutil.ParseSubnets(config.DNS.PrivateNets...)
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if err != nil {
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return nil, err
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}
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return netutil.SliceSubnetSet(nets), nil
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}
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}
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func isRunning() bool {
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return Context.dnsServer != nil && Context.dnsServer.IsRunning()
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}
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func onDNSRequest(pctx *proxy.DNSContext) {
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ip := netutil.NetAddrToAddrPort(pctx.Addr).Addr()
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if ip == (netip.Addr{}) {
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// This would be quite weird if we get here.
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return
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}
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srcs := config.Clients.Sources
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if srcs.RDNS && !ip.IsLoopback() {
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Context.rdns.Begin(ip)
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}
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if srcs.WHOIS && !netutil.IsSpecialPurposeAddr(ip) {
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Context.whois.Begin(ip)
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}
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}
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func ipsToTCPAddrs(ips []netip.Addr, port int) (tcpAddrs []*net.TCPAddr) {
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if ips == nil {
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return nil
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}
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tcpAddrs = make([]*net.TCPAddr, 0, len(ips))
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for _, ip := range ips {
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tcpAddrs = append(tcpAddrs, net.TCPAddrFromAddrPort(netip.AddrPortFrom(ip, uint16(port))))
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}
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return tcpAddrs
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}
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func ipsToUDPAddrs(ips []netip.Addr, port int) (udpAddrs []*net.UDPAddr) {
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if ips == nil {
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return nil
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}
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udpAddrs = make([]*net.UDPAddr, 0, len(ips))
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for _, ip := range ips {
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udpAddrs = append(udpAddrs, net.UDPAddrFromAddrPort(netip.AddrPortFrom(ip, uint16(port))))
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}
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return udpAddrs
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}
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func generateServerConfig(
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tlsConf *tlsConfigSettings,
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httpReg aghhttp.RegisterFunc,
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) (newConf dnsforward.ServerConfig, err error) {
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dnsConf := config.DNS
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hosts := aghalg.CoalesceSlice(dnsConf.BindHosts, []netip.Addr{netutil.IPv4Localhost()})
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newConf = dnsforward.ServerConfig{
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UDPListenAddrs: ipsToUDPAddrs(hosts, dnsConf.Port),
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TCPListenAddrs: ipsToTCPAddrs(hosts, dnsConf.Port),
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FilteringConfig: dnsConf.FilteringConfig,
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ConfigModified: onConfigModified,
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HTTPRegister: httpReg,
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OnDNSRequest: onDNSRequest,
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}
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if tlsConf.Enabled {
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newConf.TLSConfig = tlsConf.TLSConfig
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newConf.TLSConfig.ServerName = tlsConf.ServerName
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if tlsConf.PortHTTPS != 0 {
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newConf.HTTPSListenAddrs = ipsToTCPAddrs(hosts, tlsConf.PortHTTPS)
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}
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if tlsConf.PortDNSOverTLS != 0 {
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newConf.TLSListenAddrs = ipsToTCPAddrs(hosts, tlsConf.PortDNSOverTLS)
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}
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if tlsConf.PortDNSOverQUIC != 0 {
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newConf.QUICListenAddrs = ipsToUDPAddrs(hosts, tlsConf.PortDNSOverQUIC)
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}
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if tlsConf.PortDNSCrypt != 0 {
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newConf.DNSCryptConfig, err = newDNSCrypt(hosts, *tlsConf)
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if err != nil {
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// Don't wrap the error, because it's already
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// wrapped by newDNSCrypt.
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return dnsforward.ServerConfig{}, err
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}
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}
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}
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newConf.TLSv12Roots = Context.tlsRoots
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newConf.TLSAllowUnencryptedDoH = tlsConf.AllowUnencryptedDoH
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newConf.FilterHandler = applyAdditionalFiltering
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newConf.GetCustomUpstreamByClient = Context.clients.findUpstreams
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newConf.LocalPTRResolvers = dnsConf.LocalPTRResolvers
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newConf.UpstreamTimeout = dnsConf.UpstreamTimeout.Duration
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newConf.ResolveClients = config.Clients.Sources.RDNS
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newConf.UsePrivateRDNS = dnsConf.UsePrivateRDNS
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newConf.ServeHTTP3 = dnsConf.ServeHTTP3
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newConf.UseHTTP3Upstreams = dnsConf.UseHTTP3Upstreams
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return newConf, nil
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}
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func newDNSCrypt(hosts []netip.Addr, tlsConf tlsConfigSettings) (dnscc dnsforward.DNSCryptConfig, err error) {
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if tlsConf.DNSCryptConfigFile == "" {
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return dnscc, errors.Error("no dnscrypt_config_file")
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}
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f, err := os.Open(tlsConf.DNSCryptConfigFile)
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if err != nil {
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return dnscc, fmt.Errorf("opening dnscrypt config: %w", err)
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}
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defer func() { err = errors.WithDeferred(err, f.Close()) }()
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rc := &dnscrypt.ResolverConfig{}
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err = yaml.NewDecoder(f).Decode(rc)
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if err != nil {
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return dnscc, fmt.Errorf("decoding dnscrypt config: %w", err)
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}
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cert, err := rc.CreateCert()
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if err != nil {
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return dnscc, fmt.Errorf("creating dnscrypt cert: %w", err)
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}
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return dnsforward.DNSCryptConfig{
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ResolverCert: cert,
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ProviderName: rc.ProviderName,
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UDPListenAddrs: ipsToUDPAddrs(hosts, tlsConf.PortDNSCrypt),
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TCPListenAddrs: ipsToTCPAddrs(hosts, tlsConf.PortDNSCrypt),
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Enabled: true,
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}, nil
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}
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type dnsEncryption struct {
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https string
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tls string
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quic string
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}
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func getDNSEncryption() (de dnsEncryption) {
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tlsConf := tlsConfigSettings{}
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Context.tls.WriteDiskConfig(&tlsConf)
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if tlsConf.Enabled && len(tlsConf.ServerName) != 0 {
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hostname := tlsConf.ServerName
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if tlsConf.PortHTTPS != 0 {
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addr := hostname
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if tlsConf.PortHTTPS != defaultPortHTTPS {
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addr = netutil.JoinHostPort(addr, tlsConf.PortHTTPS)
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}
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de.https = (&url.URL{
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Scheme: "https",
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Host: addr,
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Path: "/dns-query",
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}).String()
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}
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if tlsConf.PortDNSOverTLS != 0 {
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de.tls = (&url.URL{
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Scheme: "tls",
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Host: netutil.JoinHostPort(hostname, tlsConf.PortDNSOverTLS),
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}).String()
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}
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if tlsConf.PortDNSOverQUIC != 0 {
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de.quic = (&url.URL{
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Scheme: "quic",
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Host: netutil.JoinHostPort(hostname, tlsConf.PortDNSOverQUIC),
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}).String()
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}
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}
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return de
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}
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// applyAdditionalFiltering adds additional client information and settings if
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// the client has them.
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func applyAdditionalFiltering(clientIP net.IP, clientID string, setts *filtering.Settings) {
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// pref is a prefix for logging messages around the scope.
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const pref = "applying filters"
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Context.filters.ApplyBlockedServices(setts, nil)
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log.Debug("%s: looking for client with ip %s and clientid %q", pref, clientIP, clientID)
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if clientIP == nil {
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return
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}
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setts.ClientIP = clientIP
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c, ok := Context.clients.Find(clientID)
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if !ok {
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c, ok = Context.clients.Find(clientIP.String())
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if !ok {
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log.Debug("%s: no clients with ip %s and clientid %q", pref, clientIP, clientID)
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return
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}
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}
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log.Debug("%s: using settings for client %q (%s; %q)", pref, c.Name, clientIP, clientID)
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if c.UseOwnBlockedServices {
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// TODO(e.burkov): Get rid of this crutch.
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svcs := c.BlockedServices
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if svcs == nil {
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svcs = []string{}
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}
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Context.filters.ApplyBlockedServices(setts, svcs)
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log.Debug("%s: services for client %q set: %s", pref, c.Name, svcs)
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}
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setts.ClientName = c.Name
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setts.ClientTags = c.Tags
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if !c.UseOwnSettings {
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return
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}
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setts.FilteringEnabled = c.FilteringEnabled
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setts.SafeSearchEnabled = c.SafeSearchEnabled
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setts.SafeBrowsingEnabled = c.SafeBrowsingEnabled
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setts.ParentalEnabled = c.ParentalEnabled
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}
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func startDNSServer() error {
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config.RLock()
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defer config.RUnlock()
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if isRunning() {
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return fmt.Errorf("unable to start forwarding DNS server: Already running")
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}
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Context.filters.EnableFilters(false)
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Context.clients.Start()
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err := Context.dnsServer.Start()
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if err != nil {
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return fmt.Errorf("couldn't start forwarding DNS server: %w", err)
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}
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Context.filters.Start()
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Context.stats.Start()
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Context.queryLog.Start()
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const topClientsNumber = 100 // the number of clients to get
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for _, ip := range Context.stats.TopClientsIP(topClientsNumber) {
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srcs := config.Clients.Sources
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if srcs.RDNS && !ip.IsLoopback() {
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Context.rdns.Begin(ip)
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}
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if srcs.WHOIS && !netutil.IsSpecialPurposeAddr(ip) {
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Context.whois.Begin(ip)
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}
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}
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return nil
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}
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func reconfigureDNSServer() (err error) {
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var newConf dnsforward.ServerConfig
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tlsConf := &tlsConfigSettings{}
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Context.tls.WriteDiskConfig(tlsConf)
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newConf, err = generateServerConfig(tlsConf, httpRegister)
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if err != nil {
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return fmt.Errorf("generating forwarding dns server config: %w", err)
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}
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err = Context.dnsServer.Reconfigure(&newConf)
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if err != nil {
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return fmt.Errorf("starting forwarding dns server: %w", err)
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}
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return nil
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}
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func stopDNSServer() (err error) {
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if !isRunning() {
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return nil
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}
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err = Context.dnsServer.Stop()
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if err != nil {
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return fmt.Errorf("stopping forwarding dns server: %w", err)
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}
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err = Context.clients.close()
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if err != nil {
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return fmt.Errorf("closing clients container: %w", err)
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}
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closeDNSServer()
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return nil
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}
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func closeDNSServer() {
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// DNS forward module must be closed BEFORE stats or queryLog because it depends on them
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if Context.dnsServer != nil {
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Context.dnsServer.Close()
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Context.dnsServer = nil
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}
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Context.filters.Close()
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if Context.stats != nil {
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err := Context.stats.Close()
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if err != nil {
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log.Debug("closing stats: %s", err)
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}
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// TODO(e.burkov): Find out if it's safe.
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Context.stats = nil
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}
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if Context.queryLog != nil {
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Context.queryLog.Close()
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Context.queryLog = nil
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}
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log.Debug("all dns modules are closed")
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}
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