package dns
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//go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen
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import (
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"context"
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"encoding/json"
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"sort"
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"strings"
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"github.com/v2fly/v2ray-core/v5/app/dns"
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"github.com/v2fly/v2ray-core/v5/app/router/routercommon"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/platform"
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"github.com/v2fly/v2ray-core/v5/infra/conf/cfgcommon"
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"github.com/v2fly/v2ray-core/v5/infra/conf/geodata"
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rule2 "github.com/v2fly/v2ray-core/v5/infra/conf/rule"
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)
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type NameServerConfig struct {
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Address *cfgcommon.Address
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ClientIP *cfgcommon.Address
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Port uint16
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SkipFallback bool
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Domains []string
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ExpectIPs cfgcommon.StringList
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cfgctx context.Context
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}
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func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
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var address cfgcommon.Address
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if err := json.Unmarshal(data, &address); err == nil {
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c.Address = &address
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return nil
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}
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var advanced struct {
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Address *cfgcommon.Address `json:"address"`
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ClientIP *cfgcommon.Address `json:"clientIp"`
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Port uint16 `json:"port"`
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SkipFallback bool `json:"skipFallback"`
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Domains []string `json:"domains"`
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ExpectIPs cfgcommon.StringList `json:"expectIps"`
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}
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if err := json.Unmarshal(data, &advanced); err == nil {
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c.Address = advanced.Address
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c.ClientIP = advanced.ClientIP
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c.Port = advanced.Port
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c.SkipFallback = advanced.SkipFallback
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c.Domains = advanced.Domains
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c.ExpectIPs = advanced.ExpectIPs
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return nil
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}
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return newError("failed to parse name server: ", string(data))
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}
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func toDomainMatchingType(t routercommon.Domain_Type) dns.DomainMatchingType {
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switch t {
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case routercommon.Domain_RootDomain:
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return dns.DomainMatchingType_Subdomain
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case routercommon.Domain_Full:
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return dns.DomainMatchingType_Full
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case routercommon.Domain_Plain:
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return dns.DomainMatchingType_Keyword
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case routercommon.Domain_Regex:
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return dns.DomainMatchingType_Regex
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default:
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panic("unknown domain type")
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}
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}
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func (c *NameServerConfig) BuildV5(ctx context.Context) (*dns.NameServer, error) {
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c.cfgctx = ctx
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return c.Build()
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}
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func (c *NameServerConfig) Build() (*dns.NameServer, error) {
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cfgctx := c.cfgctx
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if c.Address == nil {
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return nil, newError("NameServer address is not specified.")
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}
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var domains []*dns.NameServer_PriorityDomain
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var originalRules []*dns.NameServer_OriginalRule
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for _, rule := range c.Domains {
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parsedDomain, err := rule2.ParseDomainRule(cfgctx, rule)
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if err != nil {
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return nil, newError("invalid domain rule: ", rule).Base(err)
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}
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for _, pd := range parsedDomain {
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domains = append(domains, &dns.NameServer_PriorityDomain{
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Type: toDomainMatchingType(pd.Type),
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Domain: pd.Value,
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})
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}
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originalRules = append(originalRules, &dns.NameServer_OriginalRule{
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Rule: rule,
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Size: uint32(len(parsedDomain)),
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})
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}
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geoipList, err := rule2.ToCidrList(cfgctx, c.ExpectIPs)
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if err != nil {
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return nil, newError("invalid IP rule: ", c.ExpectIPs).Base(err)
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}
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var myClientIP []byte
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if c.ClientIP != nil {
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if !c.ClientIP.Family().IsIP() {
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return nil, newError("not an IP address:", c.ClientIP.String())
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}
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myClientIP = []byte(c.ClientIP.IP())
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}
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return &dns.NameServer{
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Address: &net.Endpoint{
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Network: net.Network_UDP,
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Address: c.Address.Build(),
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Port: uint32(c.Port),
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},
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ClientIp: myClientIP,
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SkipFallback: c.SkipFallback,
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PrioritizedDomain: domains,
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Geoip: geoipList,
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OriginalRules: originalRules,
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}, nil
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}
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var typeMap = map[routercommon.Domain_Type]dns.DomainMatchingType{
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routercommon.Domain_Full: dns.DomainMatchingType_Full,
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routercommon.Domain_RootDomain: dns.DomainMatchingType_Subdomain,
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routercommon.Domain_Plain: dns.DomainMatchingType_Keyword,
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routercommon.Domain_Regex: dns.DomainMatchingType_Regex,
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}
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// DNSConfig is a JSON serializable object for dns.Config.
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type DNSConfig struct { // nolint: revive
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Servers []*NameServerConfig `json:"servers"`
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Hosts map[string]*HostAddress `json:"hosts"`
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ClientIP *cfgcommon.Address `json:"clientIp"`
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Tag string `json:"tag"`
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QueryStrategy string `json:"queryStrategy"`
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DisableCache bool `json:"disableCache"`
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DisableFallback bool `json:"disableFallback"`
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DisableFallbackIfMatch bool `json:"disableFallbackIfMatch"`
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cfgctx context.Context
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}
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type HostAddress struct {
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addr *cfgcommon.Address
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addrs []*cfgcommon.Address
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}
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// UnmarshalJSON implements encoding/json.Unmarshaler.UnmarshalJSON
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func (h *HostAddress) UnmarshalJSON(data []byte) error {
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addr := new(cfgcommon.Address)
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var addrs []*cfgcommon.Address
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switch {
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case json.Unmarshal(data, &addr) == nil:
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h.addr = addr
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case json.Unmarshal(data, &addrs) == nil:
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h.addrs = addrs
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default:
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return newError("invalid address")
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}
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return nil
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}
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func getHostMapping(ha *HostAddress) *dns.HostMapping {
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if ha.addr != nil {
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if ha.addr.Family().IsDomain() {
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return &dns.HostMapping{
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ProxiedDomain: ha.addr.Domain(),
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}
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}
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return &dns.HostMapping{
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Ip: [][]byte{ha.addr.IP()},
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}
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}
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ips := make([][]byte, 0, len(ha.addrs))
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for _, addr := range ha.addrs {
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if addr.Family().IsDomain() {
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return &dns.HostMapping{
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ProxiedDomain: addr.Domain(),
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}
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}
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ips = append(ips, []byte(addr.IP()))
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}
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return &dns.HostMapping{
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Ip: ips,
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}
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}
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func (c *DNSConfig) BuildV5(ctx context.Context) (*dns.Config, error) {
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c.cfgctx = ctx
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return c.Build()
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}
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// Build implements Buildable
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func (c *DNSConfig) Build() (*dns.Config, error) {
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if c.cfgctx == nil {
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c.cfgctx = cfgcommon.NewConfigureLoadingContext(context.Background())
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geoloadername := platform.NewEnvFlag("v2ray.conf.geoloader").GetValue(func() string {
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return "standard"
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})
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if loader, err := geodata.GetGeoDataLoader(geoloadername); err == nil {
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cfgcommon.SetGeoDataLoader(c.cfgctx, loader)
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} else {
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return nil, newError("unable to create geo data loader ").Base(err)
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}
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}
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cfgEnv := cfgcommon.GetConfigureLoadingEnvironment(c.cfgctx)
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geoLoader := cfgEnv.GetGeoLoader()
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config := &dns.Config{
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Tag: c.Tag,
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DisableCache: c.DisableCache,
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DisableFallback: c.DisableFallback,
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DisableFallbackIfMatch: c.DisableFallbackIfMatch,
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}
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if c.ClientIP != nil {
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if !c.ClientIP.Family().IsIP() {
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return nil, newError("not an IP address:", c.ClientIP.String())
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}
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config.ClientIp = []byte(c.ClientIP.IP())
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}
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config.QueryStrategy = dns.QueryStrategy_USE_IP
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switch strings.ToLower(c.QueryStrategy) {
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case "useip", "use_ip", "use-ip":
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config.QueryStrategy = dns.QueryStrategy_USE_IP
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case "useip4", "useipv4", "use_ip4", "use_ipv4", "use_ip_v4", "use-ip4", "use-ipv4", "use-ip-v4":
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config.QueryStrategy = dns.QueryStrategy_USE_IP4
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case "useip6", "useipv6", "use_ip6", "use_ipv6", "use_ip_v6", "use-ip6", "use-ipv6", "use-ip-v6":
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config.QueryStrategy = dns.QueryStrategy_USE_IP6
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}
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for _, server := range c.Servers {
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server.cfgctx = c.cfgctx
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ns, err := server.Build()
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if err != nil {
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return nil, newError("failed to build nameserver").Base(err)
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}
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config.NameServer = append(config.NameServer, ns)
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}
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if c.Hosts != nil {
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mappings := make([]*dns.HostMapping, 0, 20)
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domains := make([]string, 0, len(c.Hosts))
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for domain := range c.Hosts {
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domains = append(domains, domain)
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}
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sort.Strings(domains)
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for _, domain := range domains {
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switch {
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case strings.HasPrefix(domain, "domain:"):
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domainName := domain[7:]
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if len(domainName) == 0 {
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return nil, newError("empty domain type of rule: ", domain)
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}
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = dns.DomainMatchingType_Subdomain
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mapping.Domain = domainName
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mappings = append(mappings, mapping)
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case strings.HasPrefix(domain, "geosite:"):
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listName := domain[8:]
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if len(listName) == 0 {
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return nil, newError("empty geosite rule: ", domain)
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}
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geositeList, err := geoLoader.LoadGeoSite(listName)
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if err != nil {
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return nil, newError("failed to load geosite: ", listName).Base(err)
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}
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for _, d := range geositeList {
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = typeMap[d.Type]
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mapping.Domain = d.Value
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mappings = append(mappings, mapping)
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}
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case strings.HasPrefix(domain, "regexp:"):
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regexpVal := domain[7:]
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if len(regexpVal) == 0 {
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return nil, newError("empty regexp type of rule: ", domain)
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}
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = dns.DomainMatchingType_Regex
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mapping.Domain = regexpVal
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mappings = append(mappings, mapping)
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case strings.HasPrefix(domain, "keyword:"):
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keywordVal := domain[8:]
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if len(keywordVal) == 0 {
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return nil, newError("empty keyword type of rule: ", domain)
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}
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = dns.DomainMatchingType_Keyword
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mapping.Domain = keywordVal
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mappings = append(mappings, mapping)
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case strings.HasPrefix(domain, "full:"):
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fullVal := domain[5:]
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if len(fullVal) == 0 {
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return nil, newError("empty full domain type of rule: ", domain)
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}
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = dns.DomainMatchingType_Full
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mapping.Domain = fullVal
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mappings = append(mappings, mapping)
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case strings.HasPrefix(domain, "dotless:"):
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = dns.DomainMatchingType_Regex
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switch substr := domain[8:]; {
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case substr == "":
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mapping.Domain = "^[^.]*$"
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case !strings.Contains(substr, "."):
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mapping.Domain = "^[^.]*" + substr + "[^.]*$"
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default:
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return nil, newError("substr in dotless rule should not contain a dot: ", substr)
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}
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mappings = append(mappings, mapping)
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case strings.HasPrefix(domain, "ext:"):
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kv := strings.Split(domain[4:], ":")
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if len(kv) != 2 {
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return nil, newError("invalid external resource: ", domain)
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}
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filename := kv[0]
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list := kv[1]
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geositeList, err := geoLoader.LoadGeoSiteWithAttr(filename, list)
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if err != nil {
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return nil, newError("failed to load domain list: ", list, " from ", filename).Base(err)
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}
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for _, d := range geositeList {
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = typeMap[d.Type]
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mapping.Domain = d.Value
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mappings = append(mappings, mapping)
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}
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default:
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mapping := getHostMapping(c.Hosts[domain])
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mapping.Type = dns.DomainMatchingType_Full
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mapping.Domain = domain
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mappings = append(mappings, mapping)
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}
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}
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config.StaticHosts = append(config.StaticHosts, mappings...)
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}
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return config, nil
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}
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