Xray-core/features/dns/client.go

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2020-11-25 13:01:53 +02:00
package dns
import (
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"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"
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)
// 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) ([]net.IP, error)
}
// IPv4Lookup is an optional feature for querying IPv4 addresses only.
//
// xray:api:beta
type IPv4Lookup interface {
LookupIPv4(domain string) ([]net.IP, error)
}
// IPv6Lookup is an optional feature for querying IPv6 addresses only.
//
// xray: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.
//
// 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
}