package dns import ( "github.com/xtls/xray-core/common/errors" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/serial" "github.com/xtls/xray-core/features" ) // IPOption is an object for IP query options. type IPOption struct { IPv4Enable bool IPv6Enable bool FakeEnable bool } // Client is a Xray feature for querying DNS information. // // xray:api:stable type Client interface { features.Feature // LookupIP returns IP address for the given domain. IPs may contain IPv4 and/or IPv6 addresses. LookupIP(domain string, option IPOption) ([]net.IP, error) } type HostsLookup interface { LookupHosts(domain string) *net.Address } // ClientType returns the type of Client interface. Can be used for implementing common.HasType. // // xray:api:beta func ClientType() interface{} { return (*Client)(nil) } // ErrEmptyResponse indicates that DNS query succeeded but no answer was returned. var ErrEmptyResponse = errors.New("empty response") type RCodeError uint16 func (e RCodeError) Error() string { return serial.Concat("rcode: ", uint16(e)) } func RCodeFromError(err error) uint16 { if err == nil { return 0 } cause := errors.Cause(err) if r, ok := cause.(RCodeError); ok { return uint16(r) } return 0 }