package dns import ( "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/strmatcher" "github.com/xtls/xray-core/features" "github.com/xtls/xray-core/features/dns" ) // StaticHosts represents static domain-ip mapping in DNS server. type StaticHosts struct { ips [][]net.Address matchers *strmatcher.MatcherGroup } var typeMap = map[DomainMatchingType]strmatcher.Type{ DomainMatchingType_Full: strmatcher.Full, DomainMatchingType_Subdomain: strmatcher.Domain, DomainMatchingType_Keyword: strmatcher.Substr, DomainMatchingType_Regex: strmatcher.Regex, } func toStrMatcher(t DomainMatchingType, domain string) (strmatcher.Matcher, error) { strMType, f := typeMap[t] if !f { return nil, newError("unknown mapping type", t).AtWarning() } matcher, err := strMType.New(domain) if err != nil { return nil, newError("failed to create str matcher").Base(err) } return matcher, nil } // NewStaticHosts creates a new StaticHosts instance. func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDomain) (*StaticHosts, error) { g := new(strmatcher.MatcherGroup) sh := &StaticHosts{ ips: make([][]net.Address, len(hosts)+len(legacy)+16), matchers: g, } if legacy != nil { features.PrintDeprecatedFeatureWarning("simple host mapping") for domain, ip := range legacy { matcher, err := strmatcher.Full.New(domain) common.Must(err) id := g.Add(matcher) address := ip.AsAddress() if address.Family().IsDomain() { return nil, newError("invalid domain address in static hosts: ", address.Domain()).AtWarning() } sh.ips[id] = []net.Address{address} } } for _, mapping := range hosts { matcher, err := toStrMatcher(mapping.Type, mapping.Domain) if err != nil { return nil, newError("failed to create domain matcher").Base(err) } id := g.Add(matcher) ips := make([]net.Address, 0, len(mapping.Ip)+1) switch { case len(mapping.Ip) > 0: for _, ip := range mapping.Ip { addr := net.IPAddress(ip) if addr == nil { return nil, newError("invalid IP address in static hosts: ", ip).AtWarning() } ips = append(ips, addr) } case len(mapping.ProxiedDomain) > 0: ips = append(ips, net.DomainAddress(mapping.ProxiedDomain)) default: return nil, newError("neither IP address nor proxied domain specified for domain: ", mapping.Domain).AtWarning() } // Special handling for localhost IPv6. This is a dirty workaround as JSON config supports only single IP mapping. if len(ips) == 1 && ips[0] == net.LocalHostIP { ips = append(ips, net.LocalHostIPv6) } sh.ips[id] = ips } return sh, nil } func filterIP(ips []net.Address, option dns.IPOption) []net.Address { filtered := make([]net.Address, 0, len(ips)) for _, ip := range ips { if (ip.Family().IsIPv4() && option.IPv4Enable) || (ip.Family().IsIPv6() && option.IPv6Enable) { filtered = append(filtered, ip) } } if len(filtered) == 0 { return nil } return filtered } // LookupIP returns IP address for the given domain, if exists in this StaticHosts. func (h *StaticHosts) LookupIP(domain string, option dns.IPOption) []net.Address { indices := h.matchers.Match(domain) if len(indices) == 0 { return nil } ips := []net.Address{} for _, id := range indices { ips = append(ips, h.ips[id]...) } if len(ips) == 1 && ips[0].Family().IsDomain() { return ips } return filterIP(ips, option) }