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Merge pull request #1 from patterniha/dns-new-f

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merge dns-new-f into main
This commit is contained in:
patterniha 2025-05-07 19:34:25 +03:30 committed by GitHub
commit 64d7d559ee
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GPG Key ID: B5690EEEBB952194
7 changed files with 478 additions and 189 deletions
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233
app/dns/config.pb.go
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@ -80,6 +80,7 @@ const (
QueryStrategy_USE_IP QueryStrategy = 0
QueryStrategy_USE_IP4 QueryStrategy = 1
QueryStrategy_USE_IP6 QueryStrategy = 2
QueryStrategy_USE_SYS QueryStrategy = 3
)
// Enum value maps for QueryStrategy.
@ -88,11 +89,13 @@ var (
0: "USE_IP",
1: "USE_IP4",
2: "USE_IP6",
3: "USE_SYS",
}
QueryStrategy_value = map[string]int32{
"USE_IP": 0,
"USE_IP4": 1,
"USE_IP6": 2,
"USE_SYS": 3,
}
)
@ -132,12 +135,16 @@ type NameServer struct {
ClientIp []byte `protobuf:"bytes,5,opt,name=client_ip,json=clientIp,proto3" json:"client_ip,omitempty"`
SkipFallback bool `protobuf:"varint,6,opt,name=skipFallback,proto3" json:"skipFallback,omitempty"`
PrioritizedDomain []*NameServer_PriorityDomain `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"`
Geoip []*router.GeoIP `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"`
ExpectedGeoip []*router.GeoIP `protobuf:"bytes,3,rep,name=expected_geoip,json=expectedGeoip,proto3" json:"expected_geoip,omitempty"`
OriginalRules []*NameServer_OriginalRule `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"`
QueryStrategy QueryStrategy `protobuf:"varint,7,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
AllowUnexpectedIPs bool `protobuf:"varint,8,opt,name=allowUnexpectedIPs,proto3" json:"allowUnexpectedIPs,omitempty"`
ActPrior bool `protobuf:"varint,8,opt,name=actPrior,proto3" json:"actPrior,omitempty"`
Tag string `protobuf:"bytes,9,opt,name=tag,proto3" json:"tag,omitempty"`
TimeoutMs uint64 `protobuf:"varint,10,opt,name=timeoutMs,proto3" json:"timeoutMs,omitempty"`
DisableCache bool `protobuf:"varint,11,opt,name=disableCache,proto3" json:"disableCache,omitempty"`
FinalQuery bool `protobuf:"varint,12,opt,name=finalQuery,proto3" json:"finalQuery,omitempty"`
UnexpectedGeoip []*router.GeoIP `protobuf:"bytes,13,rep,name=unexpected_geoip,json=unexpectedGeoip,proto3" json:"unexpected_geoip,omitempty"`
ActUnprior bool `protobuf:"varint,14,opt,name=actUnprior,proto3" json:"actUnprior,omitempty"`
}
func (x *NameServer) Reset() {
@ -198,9 +205,9 @@ func (x *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain {
return nil
}
func (x *NameServer) GetGeoip() []*router.GeoIP {
func (x *NameServer) GetExpectedGeoip() []*router.GeoIP {
if x != nil {
return x.Geoip
return x.ExpectedGeoip
}
return nil
}
@ -219,9 +226,9 @@ func (x *NameServer) GetQueryStrategy() QueryStrategy {
return QueryStrategy_USE_IP
}
func (x *NameServer) GetAllowUnexpectedIPs() bool {
func (x *NameServer) GetActPrior() bool {
if x != nil {
return x.AllowUnexpectedIPs
return x.ActPrior
}
return false
}
@ -240,6 +247,34 @@ func (x *NameServer) GetTimeoutMs() uint64 {
return 0
}
func (x *NameServer) GetDisableCache() bool {
if x != nil {
return x.DisableCache
}
return false
}
func (x *NameServer) GetFinalQuery() bool {
if x != nil {
return x.FinalQuery
}
return false
}
func (x *NameServer) GetUnexpectedGeoip() []*router.GeoIP {
if x != nil {
return x.UnexpectedGeoip
}
return nil
}
func (x *NameServer) GetActUnprior() bool {
if x != nil {
return x.ActUnprior
}
return false
}
type Config struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -532,7 +567,7 @@ var file_app_dns_config_proto_rawDesc = []byte{
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}
var (
@ -651,19 +697,20 @@ var file_app_dns_config_proto_goTypes = []any{
var file_app_dns_config_proto_depIdxs = []int32{
7, // 0: xray.app.dns.NameServer.address:type_name -> xray.common.net.Endpoint
4, // 1: xray.app.dns.NameServer.prioritized_domain:type_name -> xray.app.dns.NameServer.PriorityDomain
8, // 2: xray.app.dns.NameServer.geoip:type_name -> xray.app.router.GeoIP
8, // 2: xray.app.dns.NameServer.expected_geoip:type_name -> xray.app.router.GeoIP
5, // 3: xray.app.dns.NameServer.original_rules:type_name -> xray.app.dns.NameServer.OriginalRule
1, // 4: xray.app.dns.NameServer.query_strategy:type_name -> xray.app.dns.QueryStrategy
2, // 5: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
6, // 6: xray.app.dns.Config.static_hosts:type_name -> xray.app.dns.Config.HostMapping
1, // 7: xray.app.dns.Config.query_strategy:type_name -> xray.app.dns.QueryStrategy
0, // 8: xray.app.dns.NameServer.PriorityDomain.type:type_name -> xray.app.dns.DomainMatchingType
0, // 9: xray.app.dns.Config.HostMapping.type:type_name -> xray.app.dns.DomainMatchingType
10, // [10:10] is the sub-list for method output_type
10, // [10:10] is the sub-list for method input_type
10, // [10:10] is the sub-list for extension type_name
10, // [10:10] is the sub-list for extension extendee
0, // [0:10] is the sub-list for field type_name
8, // 5: xray.app.dns.NameServer.unexpected_geoip:type_name -> xray.app.router.GeoIP
2, // 6: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
6, // 7: xray.app.dns.Config.static_hosts:type_name -> xray.app.dns.Config.HostMapping
1, // 8: xray.app.dns.Config.query_strategy:type_name -> xray.app.dns.QueryStrategy
0, // 9: xray.app.dns.NameServer.PriorityDomain.type:type_name -> xray.app.dns.DomainMatchingType
0, // 10: xray.app.dns.Config.HostMapping.type:type_name -> xray.app.dns.DomainMatchingType
11, // [11:11] is the sub-list for method output_type
11, // [11:11] is the sub-list for method input_type
11, // [11:11] is the sub-list for extension type_name
11, // [11:11] is the sub-list for extension extendee
0, // [0:11] is the sub-list for field type_name
}
func init() { file_app_dns_config_proto_init() }

9
app/dns/config.proto
View File

@ -25,12 +25,16 @@ message NameServer {
}
repeated PriorityDomain prioritized_domain = 2;
repeated xray.app.router.GeoIP geoip = 3;
repeated xray.app.router.GeoIP expected_geoip = 3;
repeated OriginalRule original_rules = 4;
QueryStrategy query_strategy = 7;
bool allowUnexpectedIPs = 8;
bool actPrior = 8;
string tag = 9;
uint64 timeoutMs = 10;
bool disableCache = 11;
bool finalQuery = 12;
repeated xray.app.router.GeoIP unexpected_geoip = 13;
bool actUnprior = 14;
}
enum DomainMatchingType {
@ -44,6 +48,7 @@ enum QueryStrategy {
USE_IP = 0;
USE_IP4 = 1;
USE_IP6 = 2;
USE_SYS = 3;
}
message Config {

41
app/dns/dns.go
View File

@ -28,6 +28,7 @@ type DNS struct {
ctx context.Context
domainMatcher strmatcher.IndexMatcher
matcherInfos []*DomainMatcherInfo
checkSystem bool
}
// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
@ -47,6 +48,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
}
var ipOption dns.IPOption
checkSystem := false
switch config.QueryStrategy {
case QueryStrategy_USE_IP:
ipOption = dns.IPOption{
@ -54,6 +56,13 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
IPv6Enable: true,
FakeEnable: false,
}
case QueryStrategy_USE_SYS:
ipOption = dns.IPOption{
IPv4Enable: true,
IPv6Enable: true,
FakeEnable: false,
}
checkSystem = true
case QueryStrategy_USE_IP4:
ipOption = dns.IPOption{
IPv4Enable: true,
@ -108,7 +117,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
myClientIP = net.IP(ns.ClientIp)
}
disableCache := config.DisableCache
disableCache := config.DisableCache || ns.DisableCache
var tag = defaultTag
if len(ns.Tag) > 0 {
@ -118,6 +127,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
if !clientIPOption.IPv4Enable && !clientIPOption.IPv6Enable {
return nil, errors.New("no QueryStrategy available for ", ns.Address)
}
client, err := NewClient(ctx, ns, myClientIP, disableCache, tag, clientIPOption, &matcherInfos, updateDomain)
if err != nil {
return nil, errors.New("failed to create client").Base(err)
@ -139,6 +149,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
matcherInfos: matcherInfos,
disableFallback: config.DisableFallback,
disableFallbackIfMatch: config.DisableFallbackIfMatch,
checkSystem: checkSystem,
}, nil
}
@ -179,8 +190,14 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, uint32, er
return nil, 0, errors.New("empty domain name")
}
if s.checkSystem {
supportIPv4, supportIPv6 := checkSystemNetwork()
option.IPv4Enable = option.IPv4Enable && supportIPv4
option.IPv6Enable = option.IPv6Enable && supportIPv6
} else {
option.IPv4Enable = option.IPv4Enable && s.ipOption.IPv4Enable
option.IPv6Enable = option.IPv6Enable && s.ipOption.IPv6Enable
}
if !option.IPv4Enable && !option.IPv6Enable {
return nil, 0, dns.ErrEmptyResponse
@ -227,6 +244,9 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, uint32, er
}
errs = append(errs, err)
if client.IsFinalQuery() {
break
}
}
if len(errs) > 0 {
@ -318,3 +338,22 @@ func init() {
return New(ctx, config.(*Config))
}))
}
func checkSystemNetwork() (supportIPv4 bool, supportIPv6 bool) {
conn4, err4 := net.Dial("udp4", "8.8.8.8:53")
if err4 != nil {
supportIPv4 = false
} else {
supportIPv4 = true
conn4.Close()
}
conn6, err6 := net.Dial("udp6", "[2001:4860:4860::8888]:53")
if err6 != nil {
supportIPv6 = false
} else {
supportIPv6 = true
conn6.Close()
}
return
}

14
app/dns/dns_test.go
View File

@ -539,7 +539,7 @@ func TestIPMatch(t *testing.T) {
},
Port: uint32(port),
},
Geoip: []*router.GeoIP{
ExpectedGeoip: []*router.GeoIP{
{
CountryCode: "local",
Cidr: []*router.CIDR{
@ -563,7 +563,7 @@ func TestIPMatch(t *testing.T) {
},
Port: uint32(port),
},
Geoip: []*router.GeoIP{
ExpectedGeoip: []*router.GeoIP{
{
CountryCode: "test",
Cidr: []*router.CIDR{
@ -667,7 +667,7 @@ func TestLocalDomain(t *testing.T) {
// Equivalent of dotless:localhost
{Type: DomainMatchingType_Regex, Domain: "^[^.]*localhost[^.]*$"},
},
Geoip: []*router.GeoIP{
ExpectedGeoip: []*router.GeoIP{
{ // Will match localhost, localhost-a and localhost-b,
CountryCode: "local",
Cidr: []*router.CIDR{
@ -897,7 +897,7 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
Domain: "google.com",
},
},
Geoip: []*router.GeoIP{
ExpectedGeoip: []*router.GeoIP{
{ // Will only match 8.8.8.8 and 8.8.4.4
Cidr: []*router.CIDR{
{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
@ -922,7 +922,7 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
Domain: "google.com",
},
},
Geoip: []*router.GeoIP{
ExpectedGeoip: []*router.GeoIP{
{ // Will match 8.8.8.8 and 8.8.8.7, etc
Cidr: []*router.CIDR{
{Ip: []byte{8, 8, 8, 7}, Prefix: 24},
@ -946,7 +946,7 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
Domain: "api.google.com",
},
},
Geoip: []*router.GeoIP{
ExpectedGeoip: []*router.GeoIP{
{ // Will only match 8.8.7.7 (api.google.com)
Cidr: []*router.CIDR{
{Ip: []byte{8, 8, 7, 7}, Prefix: 32},
@ -970,7 +970,7 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
Domain: "v2.api.google.com",
},
},
Geoip: []*router.GeoIP{
ExpectedGeoip: []*router.GeoIP{
{ // Will only match 8.8.7.8 (v2.api.google.com)
Cidr: []*router.CIDR{
{Ip: []byte{8, 8, 7, 8}, Prefix: 32},

95
app/dns/nameserver.go
View File

@ -30,10 +30,14 @@ type Client struct {
skipFallback bool
domains []string
expectedIPs []*router.GeoIPMatcher
allowUnexpectedIPs bool
unexpectedIPs []*router.GeoIPMatcher
actPrior bool
actUnprior bool
tag string
timeoutMs time.Duration
finalQuery bool
ipOption *dns.IPOption
checkSystem bool
}
// NewServer creates a name server object according to the network destination url.
@ -150,13 +154,23 @@ func NewClient(
}
// Establish expected IPs
var matchers []*router.GeoIPMatcher
for _, geoip := range ns.Geoip {
var expectedMatchers []*router.GeoIPMatcher
for _, geoip := range ns.ExpectedGeoip {
matcher, err := router.GlobalGeoIPContainer.Add(geoip)
if err != nil {
return errors.New("failed to create ip matcher").Base(err).AtWarning()
return errors.New("failed to create expected ip matcher").Base(err).AtWarning()
}
matchers = append(matchers, matcher)
expectedMatchers = append(expectedMatchers, matcher)
}
// Establish unexpected IPs
var unexpectedMatchers []*router.GeoIPMatcher
for _, geoip := range ns.UnexpectedGeoip {
matcher, err := router.GlobalGeoIPContainer.Add(geoip)
if err != nil {
return errors.New("failed to create unexpected ip matcher").Base(err).AtWarning()
}
unexpectedMatchers = append(unexpectedMatchers, matcher)
}
if len(clientIP) > 0 {
@ -173,14 +187,20 @@ func NewClient(
timeoutMs = time.Duration(ns.TimeoutMs) * time.Millisecond
}
checkSystem := ns.QueryStrategy == QueryStrategy_USE_SYS
client.server = server
client.skipFallback = ns.SkipFallback
client.domains = rules
client.expectedIPs = matchers
client.allowUnexpectedIPs = ns.AllowUnexpectedIPs
client.expectedIPs = expectedMatchers
client.unexpectedIPs = unexpectedMatchers
client.actPrior = ns.ActPrior
client.actUnprior = ns.ActUnprior
client.tag = tag
client.timeoutMs = timeoutMs
client.finalQuery = ns.FinalQuery
client.ipOption = &ipOption
client.checkSystem = checkSystem
return nil
})
return client, err
@ -191,10 +211,21 @@ func (c *Client) Name() string {
return c.server.Name()
}
func (c *Client) IsFinalQuery() bool {
return c.finalQuery
}
// QueryIP sends DNS query to the name server with the client's IP.
func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, uint32, error) {
if c.checkSystem {
supportIPv4, supportIPv6 := checkSystemNetwork()
option.IPv4Enable = option.IPv4Enable && supportIPv4
option.IPv6Enable = option.IPv6Enable && supportIPv6
} else {
option.IPv4Enable = option.IPv4Enable && c.ipOption.IPv4Enable
option.IPv6Enable = option.IPv6Enable && c.ipOption.IPv6Enable
}
if !option.IPv4Enable && !option.IPv6Enable {
return nil, 0, dns.ErrEmptyResponse
}
@ -212,39 +243,47 @@ func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption
return nil, 0, dns.ErrEmptyResponse
}
if len(c.expectedIPs) > 0 {
newIps := c.MatchExpectedIPs(domain, ips)
if len(newIps) == 0 {
if !c.allowUnexpectedIPs {
if len(c.expectedIPs) > 0 && !c.actPrior {
ips = router.MatchIPs(c.expectedIPs, ips, false)
errors.LogDebug(context.Background(), "domain ", domain, " expectedIPs ", ips, " matched at server ", c.Name())
if len(ips) == 0 {
return nil, 0, dns.ErrEmptyResponse
}
} else {
ips = newIps
}
if len(c.unexpectedIPs) > 0 && !c.actUnprior {
ips = router.MatchIPs(c.unexpectedIPs, ips, true)
errors.LogDebug(context.Background(), "domain ", domain, " unexpectedIPs ", ips, " matched at server ", c.Name())
if len(ips) == 0 {
return nil, 0, dns.ErrEmptyResponse
}
}
if len(c.expectedIPs) > 0 && c.actPrior {
ipsNew := router.MatchIPs(c.expectedIPs, ips, false)
if len(ipsNew) > 0 {
ips = ipsNew
errors.LogDebug(context.Background(), "domain ", domain, " priorIPs ", ips, " matched at server ", c.Name())
}
}
if len(c.unexpectedIPs) > 0 && c.actUnprior {
ipsNew := router.MatchIPs(c.unexpectedIPs, ips, true)
if len(ipsNew) > 0 {
ips = ipsNew
errors.LogDebug(context.Background(), "domain ", domain, " unpriorIPs ", ips, " matched at server ", c.Name())
}
}
return ips, ttl, nil
}
// MatchExpectedIPs matches queried domain IPs with expected IPs and returns matched ones.
func (c *Client) MatchExpectedIPs(domain string, ips []net.IP) []net.IP {
var newIps []net.IP
for _, ip := range ips {
for _, matcher := range c.expectedIPs {
if matcher.Match(ip) {
newIps = append(newIps, ip)
break
}
}
}
errors.LogDebug(context.Background(), "domain ", domain, " expectedIPs ", newIps, " matched at server ", c.Name())
return newIps
}
func ResolveIpOptionOverride(queryStrategy QueryStrategy, ipOption dns.IPOption) dns.IPOption {
switch queryStrategy {
case QueryStrategy_USE_IP:
return ipOption
case QueryStrategy_USE_SYS:
return ipOption
case QueryStrategy_USE_IP4:
return dns.IPOption{
IPv4Enable: ipOption.IPv4Enable,

26
app/router/condition_geoip.go
View File

@ -116,3 +116,29 @@ func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
}
var GlobalGeoIPContainer GeoIPMatcherContainer
func MatchIPs(matchers []*GeoIPMatcher, ips []net.IP, reverse bool) []net.IP {
if len(matchers) == 0 {
panic("GeoIP matchers should not be empty to avoid ambiguity")
}
newIPs := make([]net.IP, 0, len(ips))
var isFound bool
for _, ip := range ips {
isFound = false
for _, matcher := range matchers {
if matcher.Match(ip) {
isFound = true
break
}
}
if isFound && !reverse {
newIPs = append(newIPs, ip)
continue
}
if !isFound && reverse {
newIPs = append(newIPs, ip)
continue
}
}
return newIPs
}

153
infra/conf/dns.go
View File

@ -1,7 +1,11 @@
package conf
import (
"bufio"
"encoding/json"
"os"
"path/filepath"
"runtime"
"sort"
"strings"
@ -20,9 +24,11 @@ type NameServerConfig struct {
ExpectedIPs StringList `json:"expectedIPs"`
ExpectIPs StringList `json:"expectIPs"`
QueryStrategy string `json:"queryStrategy"`
AllowUnexpectedIPs bool `json:"allowUnexpectedIps"`
Tag string `json:"tag"`
TimeoutMs uint64 `json:"timeoutMs"`
DisableCache bool `json:"disableCache"`
FinalQuery bool `json:"finalQuery"`
UnexpectedIPs StringList `json:"unexpectedIPs"`
}
// UnmarshalJSON implements encoding/json.Unmarshaler.UnmarshalJSON
@ -42,9 +48,11 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
ExpectedIPs StringList `json:"expectedIPs"`
ExpectIPs StringList `json:"expectIPs"`
QueryStrategy string `json:"queryStrategy"`
AllowUnexpectedIPs bool `json:"allowUnexpectedIps"`
Tag string `json:"tag"`
TimeoutMs uint64 `json:"timeoutMs"`
DisableCache bool `json:"disableCache"`
FinalQuery bool `json:"finalQuery"`
UnexpectedIPs StringList `json:"unexpectedIPs"`
}
if err := json.Unmarshal(data, &advanced); err == nil {
c.Address = advanced.Address
@ -55,9 +63,11 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
c.ExpectedIPs = advanced.ExpectedIPs
c.ExpectIPs = advanced.ExpectIPs
c.QueryStrategy = advanced.QueryStrategy
c.AllowUnexpectedIPs = advanced.AllowUnexpectedIPs
c.Tag = advanced.Tag
c.TimeoutMs = advanced.TimeoutMs
c.DisableCache = advanced.DisableCache
c.FinalQuery = advanced.FinalQuery
c.UnexpectedIPs = advanced.UnexpectedIPs
return nil
}
@ -105,13 +115,38 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
})
}
var expectedIPs = c.ExpectedIPs
if len(expectedIPs) == 0 {
expectedIPs = c.ExpectIPs
if len(c.ExpectedIPs) == 0 {
c.ExpectedIPs = c.ExpectIPs
}
geoipList, err := ToCidrList(expectedIPs)
actPrior := false
var newExpectedIPs StringList
for _, s := range c.ExpectedIPs {
if s == "*" {
actPrior = true
} else {
newExpectedIPs = append(newExpectedIPs, s)
}
}
actUnprior := false
var newUnexpectedIPs StringList
for _, s := range c.UnexpectedIPs {
if s == "*" {
actUnprior = true
} else {
newUnexpectedIPs = append(newUnexpectedIPs, s)
}
}
expectedGeoipList, err := ToCidrList(newExpectedIPs)
if err != nil {
return nil, errors.New("invalid IP rule: ", expectedIPs).Base(err)
return nil, errors.New("invalid expected IP rule: ", c.ExpectedIPs).Base(err)
}
unexpectedGeoipList, err := ToCidrList(newUnexpectedIPs)
if err != nil {
return nil, errors.New("invalid unexpected IP rule: ", c.UnexpectedIPs).Base(err)
}
var myClientIP []byte
@ -131,12 +166,16 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
ClientIp: myClientIP,
SkipFallback: c.SkipFallback,
PrioritizedDomain: domains,
Geoip: geoipList,
ExpectedGeoip: expectedGeoipList,
OriginalRules: originalRules,
QueryStrategy: resolveQueryStrategy(c.QueryStrategy),
AllowUnexpectedIPs: c.AllowUnexpectedIPs,
ActPrior: actPrior,
Tag: c.Tag,
TimeoutMs: c.TimeoutMs,
DisableCache: c.DisableCache,
FinalQuery: c.FinalQuery,
UnexpectedGeoip: unexpectedGeoipList,
ActUnprior: actUnprior,
}, nil
}
@ -157,6 +196,7 @@ type DNSConfig struct {
DisableCache bool `json:"disableCache"`
DisableFallback bool `json:"disableFallback"`
DisableFallbackIfMatch bool `json:"disableFallbackIfMatch"`
UseSystemHosts bool `json:"useSystemHosts"`
}
type HostAddress struct {
@ -378,6 +418,15 @@ func (c *DNSConfig) Build() (*dns.Config, error) {
}
config.StaticHosts = append(config.StaticHosts, staticHosts...)
}
if c.UseSystemHosts {
systemHosts, err := readSystemHosts()
if err != nil {
return nil, errors.New("failed to read system hosts").Base(err)
}
for domain, ips := range systemHosts {
config.StaticHosts = append(config.StaticHosts, &dns.Config_HostMapping{Ip: ips, Domain: domain, Type: dns.DomainMatchingType_Full})
}
}
return config, nil
}
@ -390,7 +439,91 @@ func resolveQueryStrategy(queryStrategy string) dns.QueryStrategy {
return dns.QueryStrategy_USE_IP4
case "useip6", "useipv6", "use_ip6", "use_ipv6", "use_ip_v6", "use-ip6", "use-ipv6", "use-ip-v6":
return dns.QueryStrategy_USE_IP6
case "usesys", "usesystem", "use_sys", "use_system", "use-sys", "use-system":
return dns.QueryStrategy_USE_SYS
default:
return dns.QueryStrategy_USE_IP
}
}
func readSystemHosts() (map[string][][]byte, error) {
var hostsPath string
switch runtime.GOOS {
case "windows":
hostsPath = filepath.Join(os.Getenv("SystemRoot"), "System32", "drivers", "etc", "hosts")
default:
hostsPath = "/etc/hosts"
}
file, err := os.Open(hostsPath)
if err != nil {
return nil, err
}
defer file.Close()
hostsMap := make(map[string][][]byte)
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if i := strings.IndexByte(line, '#'); i >= 0 {
// Discard comments.
line = line[0:i]
}
f := getFields(line)
if len(f) < 2 {
continue
}
addr := net.ParseAddress(f[0])
if addr.Family().IsDomain() {
continue
}
ip := addr.IP()
for i := 1; i < len(f); i++ {
domain := strings.TrimSuffix(f[i], ".")
domain = strings.ToLower(domain)
if v, ok := hostsMap[domain]; ok {
hostsMap[domain] = append(v, ip)
} else {
hostsMap[domain] = [][]byte{ip}
}
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
return hostsMap, nil
}
func getFields(s string) []string { return splitAtBytes(s, " \r\t\n") }
// Count occurrences in s of any bytes in t.
func countAnyByte(s string, t string) int {
n := 0
for i := 0; i < len(s); i++ {
if strings.IndexByte(t, s[i]) >= 0 {
n++
}
}
return n
}
// Split s at any bytes in t.
func splitAtBytes(s string, t string) []string {
a := make([]string, 1+countAnyByte(s, t))
n := 0
last := 0
for i := 0; i < len(s); i++ {
if strings.IndexByte(t, s[i]) >= 0 {
if last < i {
a[n] = s[last:i]
n++
}
last = i + 1
}
}
if last < len(s) {
a[n] = s[last:]
n++
}
return a[0:n]
}