AdGuardHome/dns.go

118 lines
2.9 KiB
Go

package main
import (
"fmt"
"net"
"os"
"github.com/AdguardTeam/AdGuardHome/dnsfilter"
"github.com/AdguardTeam/AdGuardHome/dnsforward"
"github.com/AdguardTeam/dnsproxy/upstream"
"github.com/AdguardTeam/golibs/log"
"github.com/joomcode/errorx"
)
var dnsServer *dnsforward.Server
// initDNSServer creates an instance of the dnsforward.Server
// Please note that we must do it even if we don't start it
// so that we had access to the query log and the stats
func initDNSServer(baseDir string) {
err := os.MkdirAll(baseDir, 0755)
if err != nil {
log.Fatalf("Cannot create DNS data dir at %s: %s", baseDir, err)
}
dnsServer = dnsforward.NewServer(baseDir)
}
func isRunning() bool {
return dnsServer != nil && dnsServer.IsRunning()
}
func generateServerConfig() dnsforward.ServerConfig {
filters := []dnsfilter.Filter{}
userFilter := userFilter()
filters = append(filters, dnsfilter.Filter{
ID: userFilter.ID,
Rules: userFilter.Rules,
})
for _, filter := range config.Filters {
filters = append(filters, dnsfilter.Filter{
ID: filter.ID,
Rules: filter.Rules,
})
}
newconfig := dnsforward.ServerConfig{
UDPListenAddr: &net.UDPAddr{IP: net.ParseIP(config.DNS.BindHost), Port: config.DNS.Port},
TCPListenAddr: &net.TCPAddr{IP: net.ParseIP(config.DNS.BindHost), Port: config.DNS.Port},
FilteringConfig: config.DNS.FilteringConfig,
Filters: filters,
}
if config.TLS.Enabled {
newconfig.TLSConfig = config.TLS.TLSConfig
if config.TLS.PortDNSOverTLS != 0 {
newconfig.TLSListenAddr = &net.TCPAddr{IP: net.ParseIP(config.DNS.BindHost), Port: config.TLS.PortDNSOverTLS}
}
}
for _, u := range config.DNS.UpstreamDNS {
opts := upstream.Options{
Timeout: dnsforward.DefaultTimeout,
Bootstrap: config.DNS.BootstrapDNS,
}
dnsUpstream, err := upstream.AddressToUpstream(u, opts)
if err != nil {
log.Printf("Couldn't get upstream: %s", err)
// continue, just ignore the upstream
continue
}
newconfig.Upstreams = append(newconfig.Upstreams, dnsUpstream)
}
newconfig.AllServers = config.DNS.AllServers
return newconfig
}
func startDNSServer() error {
if isRunning() {
return fmt.Errorf("unable to start forwarding DNS server: Already running")
}
newconfig := generateServerConfig()
err := dnsServer.Start(&newconfig)
if err != nil {
return errorx.Decorate(err, "Couldn't start forwarding DNS server")
}
return nil
}
func reconfigureDNSServer() error {
if !isRunning() {
return fmt.Errorf("Refusing to reconfigure forwarding DNS server: not running")
}
config := generateServerConfig()
err := dnsServer.Reconfigure(&config)
if err != nil {
return errorx.Decorate(err, "Couldn't start forwarding DNS server")
}
return nil
}
func stopDNSServer() error {
if !isRunning() {
return fmt.Errorf("Refusing to stop forwarding DNS server: not running")
}
err := dnsServer.Stop()
if err != nil {
return errorx.Decorate(err, "Couldn't stop forwarding DNS server")
}
return nil
}