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Pull request: 4403-internal-proxy

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Updates #4403.

* commit 'd519929988575439c2238924ae5b1d96091445f7':
  dnsforward: imp code, fmt
  Also honor the user-defined UpstreamMode for the internal DNS proxy
This commit is contained in:
Ainar Garipov 2022-08-29 16:23:03 +03:00
commit a0c8aee3f7
7 changed files with 123 additions and 96 deletions
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128
internal/dnsforward/config.go
View file

@ -163,10 +163,10 @@ type TLSConfig struct {
// DNSCryptConfig is the DNSCrypt server configuration struct.
type DNSCryptConfig struct {
ResolverCert *dnscrypt.Cert
ProviderName string
UDPListenAddrs []*net.UDPAddr
TCPListenAddrs []*net.TCPAddr
ProviderName string
ResolverCert *dnscrypt.Cert
Enabled bool
}
@ -214,68 +214,67 @@ var defaultValues = ServerConfig{
FilteringConfig: FilteringConfig{BlockedResponseTTL: 3600},
}
// createProxyConfig creates and validates configuration for the main proxy
func (s *Server) createProxyConfig() (proxy.Config, error) {
proxyConfig := proxy.Config{
UDPListenAddr: s.conf.UDPListenAddrs,
TCPListenAddr: s.conf.TCPListenAddrs,
Ratelimit: int(s.conf.Ratelimit),
RatelimitWhitelist: s.conf.RatelimitWhitelist,
RefuseAny: s.conf.RefuseAny,
TrustedProxies: s.conf.TrustedProxies,
CacheMinTTL: s.conf.CacheMinTTL,
CacheMaxTTL: s.conf.CacheMaxTTL,
CacheOptimistic: s.conf.CacheOptimistic,
UpstreamConfig: s.conf.UpstreamConfig,
// createProxyConfig creates and validates configuration for the main proxy.
func (s *Server) createProxyConfig() (conf proxy.Config, err error) {
srvConf := s.conf
conf = proxy.Config{
UDPListenAddr: srvConf.UDPListenAddrs,
TCPListenAddr: srvConf.TCPListenAddrs,
Ratelimit: int(srvConf.Ratelimit),
RatelimitWhitelist: srvConf.RatelimitWhitelist,
RefuseAny: srvConf.RefuseAny,
TrustedProxies: srvConf.TrustedProxies,
CacheMinTTL: srvConf.CacheMinTTL,
CacheMaxTTL: srvConf.CacheMaxTTL,
CacheOptimistic: srvConf.CacheOptimistic,
UpstreamConfig: srvConf.UpstreamConfig,
BeforeRequestHandler: s.beforeRequestHandler,
RequestHandler: s.handleDNSRequest,
EnableEDNSClientSubnet: s.conf.EnableEDNSClientSubnet,
MaxGoroutines: int(s.conf.MaxGoroutines),
EnableEDNSClientSubnet: srvConf.EnableEDNSClientSubnet,
MaxGoroutines: int(srvConf.MaxGoroutines),
}
if s.conf.CacheSize != 0 {
proxyConfig.CacheEnabled = true
proxyConfig.CacheSizeBytes = int(s.conf.CacheSize)
if srvConf.CacheSize != 0 {
conf.CacheEnabled = true
conf.CacheSizeBytes = int(srvConf.CacheSize)
}
proxyConfig.UpstreamMode = proxy.UModeLoadBalance
if s.conf.AllServers {
proxyConfig.UpstreamMode = proxy.UModeParallel
} else if s.conf.FastestAddr {
proxyConfig.UpstreamMode = proxy.UModeFastestAddr
proxyConfig.FastestPingTimeout = s.conf.FastestTimeout.Duration
}
setProxyUpstreamMode(
&conf,
srvConf.AllServers,
srvConf.FastestAddr,
srvConf.FastestTimeout.Duration,
)
for i, s := range s.conf.BogusNXDomain {
subnet, err := netutil.ParseSubnet(s)
for i, s := range srvConf.BogusNXDomain {
var subnet *net.IPNet
subnet, err = netutil.ParseSubnet(s)
if err != nil {
log.Error("subnet at index %d: %s", i, err)
continue
}
proxyConfig.BogusNXDomain = append(proxyConfig.BogusNXDomain, subnet)
conf.BogusNXDomain = append(conf.BogusNXDomain, subnet)
}
// TLS settings
err := s.prepareTLS(&proxyConfig)
err = s.prepareTLS(&conf)
if err != nil {
return proxyConfig, err
return conf, fmt.Errorf("validating tls: %w", err)
}
if s.conf.DNSCryptConfig.Enabled {
proxyConfig.DNSCryptUDPListenAddr = s.conf.DNSCryptConfig.UDPListenAddrs
proxyConfig.DNSCryptTCPListenAddr = s.conf.DNSCryptConfig.TCPListenAddrs
proxyConfig.DNSCryptProviderName = s.conf.DNSCryptConfig.ProviderName
proxyConfig.DNSCryptResolverCert = s.conf.DNSCryptConfig.ResolverCert
if c := srvConf.DNSCryptConfig; c.Enabled {
conf.DNSCryptUDPListenAddr = c.UDPListenAddrs
conf.DNSCryptTCPListenAddr = c.TCPListenAddrs
conf.DNSCryptProviderName = c.ProviderName
conf.DNSCryptResolverCert = c.ResolverCert
}
// Validate proxy config
if proxyConfig.UpstreamConfig == nil || len(proxyConfig.UpstreamConfig.Upstreams) == 0 {
return proxyConfig, errors.Error("no default upstream servers configured")
if conf.UpstreamConfig == nil || len(conf.UpstreamConfig.Upstreams) == 0 {
return conf, errors.Error("no default upstream servers configured")
}
return proxyConfig, nil
return conf, nil
}
const (
@ -381,14 +380,45 @@ func (s *Server) prepareUpstreamSettings() error {
return nil
}
// prepareIntlProxy - initializes DNS proxy that we use for internal DNS queries
func (s *Server) prepareIntlProxy() {
// prepareInternalProxy initializes the DNS proxy that is used for internal DNS
// queries, such at client PTR resolving and udpater hostname resolving.
func (s *Server) prepareInternalProxy() {
conf := &proxy.Config{
CacheEnabled: true,
CacheSizeBytes: 4096,
UpstreamConfig: s.conf.UpstreamConfig,
MaxGoroutines: int(s.conf.MaxGoroutines),
}
srvConf := s.conf
setProxyUpstreamMode(
conf,
srvConf.AllServers,
srvConf.FastestAddr,
srvConf.FastestTimeout.Duration,
)
// TODO(a.garipov): Make a proper constructor for proxy.Proxy.
s.internalProxy = &proxy.Proxy{
Config: proxy.Config{
CacheEnabled: true,
CacheSizeBytes: 4096,
UpstreamConfig: s.conf.UpstreamConfig,
},
Config: *conf,
}
}
// setProxyUpstreamMode sets the upstream mode and related settings in conf
// based on provided parameters.
func setProxyUpstreamMode(
conf *proxy.Config,
allServers bool,
fastestAddr bool,
fastestTimeout time.Duration,
) {
if allServers {
conf.UpstreamMode = proxy.UModeParallel
} else if fastestAddr {
conf.UpstreamMode = proxy.UModeFastestAddr
conf.FastestPingTimeout = fastestTimeout
} else {
conf.UpstreamMode = proxy.UModeLoadBalance
}
}

25
internal/dnsforward/dnsforward.go
View file

@ -49,11 +49,12 @@ type hostToIPTable = map[string]net.IP
// Server is the main way to start a DNS server.
//
// Example:
// s := dnsforward.Server{}
// err := s.Start(nil) // will start a DNS server listening on default port 53, in a goroutine
// err := s.Reconfigure(ServerConfig{UDPListenAddr: &net.UDPAddr{Port: 53535}}) // will reconfigure running DNS server to listen on UDP port 53535
// err := s.Stop() // will stop listening on port 53535 and cancel all goroutines
// err := s.Start(nil) // will start listening again, on port 53535, in a goroutine
//
// s := dnsforward.Server{}
// err := s.Start(nil) // will start a DNS server listening on default port 53, in a goroutine
// err := s.Reconfigure(ServerConfig{UDPListenAddr: &net.UDPAddr{Port: 53535}}) // will reconfigure running DNS server to listen on UDP port 53535
// err := s.Stop() // will stop listening on port 53535 and cancel all goroutines
// err := s.Start(nil) // will start listening again, on port 53535, in a goroutine
//
// The zero Server is empty and ready for use.
type Server struct {
@ -176,18 +177,6 @@ func NewServer(p DNSCreateParams) (s *Server, err error) {
return s, nil
}
// NewCustomServer creates a new instance of *Server with custom internal proxy.
func NewCustomServer(internalProxy *proxy.Proxy) *Server {
s := &Server{
recDetector: newRecursionDetector(0, 1),
}
if internalProxy != nil {
s.internalProxy = internalProxy
}
return s
}
// Close gracefully closes the server. It is safe for concurrent use.
//
// TODO(e.burkov): A better approach would be making Stop method waiting for all
@ -488,7 +477,7 @@ func (s *Server) Prepare(config *ServerConfig) error {
// Prepare a DNS proxy instance that we use for internal DNS queries
// --
s.prepareIntlProxy()
s.prepareInternalProxy()
s.access, err = newAccessCtx(s.conf.AllowedClients, s.conf.DisallowedClients, s.conf.BlockedHosts)
if err != nil {

14
internal/dnsforward/dnsforward_test.go
View file

@ -1217,13 +1217,17 @@ func TestServer_Exchange(t *testing.T) {
errUpstream := aghtest.NewErrorUpstream()
nonPtrUpstream := aghtest.NewBlockUpstream("some-host", true)
srv := NewCustomServer(&proxy.Proxy{
Config: proxy.Config{
UpstreamConfig: &proxy.UpstreamConfig{
Upstreams: []upstream.Upstream{extUpstream},
srv := &Server{
recDetector: newRecursionDetector(0, 1),
internalProxy: &proxy.Proxy{
Config: proxy.Config{
UpstreamConfig: &proxy.UpstreamConfig{
Upstreams: []upstream.Upstream{extUpstream},
},
},
},
})
}
srv.conf.ResolveClients = true
srv.conf.UsePrivateRDNS = true

13
internal/dnsforward/http.go
View file

@ -711,11 +711,16 @@ func (s *Server) handleTestUpstreamDNS(w http.ResponseWriter, r *http.Request) {
}
}
// handleDoH is the DNS-over-HTTPs handler.
//
// Control flow:
// web
// -> dnsforward.handleDoH -> dnsforward.ServeHTTP
// -> proxy.ServeHTTP -> proxy.handleDNSRequest
// -> dnsforward.handleDNSRequest
//
// HTTP server
// -> dnsforward.handleDoH
// -> dnsforward.ServeHTTP
// -> proxy.ServeHTTP
// -> proxy.handleDNSRequest
// -> dnsforward.handleDNSRequest
func (s *Server) handleDoH(w http.ResponseWriter, r *http.Request) {
if !s.conf.TLSAllowUnencryptedDoH && r.TLS == nil {
aghhttp.Error(r, w, http.StatusNotFound, "Not Found")

8
internal/dnsforward/svcbmsg.go
View file

@ -157,10 +157,10 @@ var svcbKeyHandlers = map[string]svcbKeyHandler{
// Firstly, the parsing of non-contiguous values isn't supported. Secondly, the
// parsing of value-lists is not supported either.
//
// ipv4hint=127.0.0.1 // Supported.
// ipv4hint="127.0.0.1" // Unsupported.
// ipv4hint=127.0.0.1,127.0.0.2 // Unsupported.
// ipv4hint="127.0.0.1,127.0.0.2" // Unsupported.
// ipv4hint=127.0.0.1 // Supported.
// ipv4hint="127.0.0.1" // Unsupported.
// ipv4hint=127.0.0.1,127.0.0.2 // Unsupported.
// ipv4hint="127.0.0.1,127.0.0.2" // Unsupported.
//
// TODO(a.garipov): Support all of these.
func (s *Server) genAnswerSVCB(req *dns.Msg, svcb *rules.DNSSVCB) (ans *dns.SVCB) {

4
internal/home/dns.go
View file

@ -280,10 +280,10 @@ func newDNSCrypt(hosts []net.IP, tlsConf tlsConfigSettings) (dnscc dnsforward.DN
}
return dnsforward.DNSCryptConfig{
UDPListenAddrs: ipsToUDPAddrs(hosts, tlsConf.PortDNSCrypt),
TCPListenAddrs: ipsToTCPAddrs(hosts, tlsConf.PortDNSCrypt),
ResolverCert: cert,
ProviderName: rc.ProviderName,
UDPListenAddrs: ipsToUDPAddrs(hosts, tlsConf.PortDNSCrypt),
TCPListenAddrs: ipsToTCPAddrs(hosts, tlsConf.PortDNSCrypt),
Enabled: true,
}, nil
}

27
internal/version/version.go
View file

@ -73,8 +73,7 @@ const (
// fmtModule returns formatted information about module. The result looks like:
//
// github.com/Username/module@v1.2.3 (sum: someHASHSUM=)
//
// github.com/Username/module@v1.2.3 (sum: someHASHSUM=)
func fmtModule(m *debug.Module) (formatted string) {
if m == nil {
return ""
@ -118,18 +117,18 @@ const (
// Verbose returns formatted build information. Output example:
//
// AdGuard Home
// Version: v0.105.3
// Channel: development
// Go version: go1.15.3
// Build time: 2021-03-30T16:26:08Z+0300
// GOOS: darwin
// GOARCH: amd64
// Race: false
// Main module:
// ...
// Dependencies:
// ...
// AdGuard Home
// Version: v0.105.3
// Channel: development
// Go version: go1.15.3
// Build time: 2021-03-30T16:26:08Z+0300
// GOOS: darwin
// GOARCH: amd64
// Race: false
// Main module:
// ...
// Dependencies:
// ...
//
// TODO(e.burkov): Make it write into passed io.Writer.
func Verbose() (v string) {