mirror of https://github.com/XTLS/Xray-core
81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
package localdns
|
|
|
|
import (
|
|
"github.com/xtls/xray-core/common/net"
|
|
"github.com/xtls/xray-core/features/dns"
|
|
)
|
|
|
|
// Client is an implementation of dns.Client, which queries localhost for DNS.
|
|
type Client struct{}
|
|
|
|
// Type implements common.HasType.
|
|
func (*Client) Type() interface{} {
|
|
return dns.ClientType()
|
|
}
|
|
|
|
// Start implements common.Runnable.
|
|
func (*Client) Start() error { return nil }
|
|
|
|
// Close implements common.Closable.
|
|
func (*Client) Close() error { return nil }
|
|
|
|
// LookupIP implements Client.
|
|
func (*Client) LookupIP(host string) ([]net.IP, error) {
|
|
ips, err := net.LookupIP(host)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
parsedIPs := make([]net.IP, 0, len(ips))
|
|
for _, ip := range ips {
|
|
parsed := net.IPAddress(ip)
|
|
if parsed != nil {
|
|
parsedIPs = append(parsedIPs, parsed.IP())
|
|
}
|
|
}
|
|
if len(parsedIPs) == 0 {
|
|
return nil, dns.ErrEmptyResponse
|
|
}
|
|
return parsedIPs, nil
|
|
}
|
|
|
|
// LookupIPv4 implements IPv4Lookup.
|
|
func (c *Client) LookupIPv4(host string) ([]net.IP, error) {
|
|
ips, err := c.LookupIP(host)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ipv4 := make([]net.IP, 0, len(ips))
|
|
for _, ip := range ips {
|
|
if len(ip) == net.IPv4len {
|
|
ipv4 = append(ipv4, ip)
|
|
}
|
|
}
|
|
if len(ipv4) == 0 {
|
|
return nil, dns.ErrEmptyResponse
|
|
}
|
|
return ipv4, nil
|
|
}
|
|
|
|
// LookupIPv6 implements IPv6Lookup.
|
|
func (c *Client) LookupIPv6(host string) ([]net.IP, error) {
|
|
ips, err := c.LookupIP(host)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ipv6 := make([]net.IP, 0, len(ips))
|
|
for _, ip := range ips {
|
|
if len(ip) == net.IPv6len {
|
|
ipv6 = append(ipv6, ip)
|
|
}
|
|
}
|
|
if len(ipv6) == 0 {
|
|
return nil, dns.ErrEmptyResponse
|
|
}
|
|
return ipv6, nil
|
|
}
|
|
|
|
// New create a new dns.Client that queries localhost for DNS.
|
|
func New() *Client {
|
|
return &Client{}
|
|
}
|