package dns import ( "v2ray.com/core/common/errors" "v2ray.com/core/common/net" "v2ray.com/core/common/serial" "v2ray.com/core/features" ) // Client is a V2Ray feature for querying DNS information. // // v2ray: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) ([]net.IP, error) } // IPv4Lookup is an optional feature for querying IPv4 addresses only. // // v2ray:api:beta type IPv4Lookup interface { LookupIPv4(domain string) ([]net.IP, error) } // IPv6Lookup is an optional feature for querying IPv6 addresses only. // // v2ray:api:beta type IPv6Lookup interface { LookupIPv6(domain string) ([]net.IP, error) } // ClientType returns the type of Client interface. Can be used for implementing common.HasType. // // v2ray: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 }