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64 lines
1.4 KiB
64 lines
1.4 KiB
package localdns
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import (
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/features/dns"
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)
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// Client is an implementation of dns.Client, which queries localhost for DNS.
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type Client struct{}
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// Type implements common.HasType.
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func (*Client) Type() interface{} {
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return dns.ClientType()
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}
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// Start implements common.Runnable.
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func (*Client) Start() error { return nil }
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// Close implements common.Closable.
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func (*Client) Close() error { return nil }
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// LookupIP implements Client.
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func (*Client) LookupIP(host string, option dns.IPOption) ([]net.IP, error) {
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ips, err := net.LookupIP(host)
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if err != nil {
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return nil, err
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}
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parsedIPs := make([]net.IP, 0, len(ips))
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ipv4 := make([]net.IP, 0, len(ips))
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ipv6 := make([]net.IP, 0, len(ips))
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for _, ip := range ips {
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parsed := net.IPAddress(ip)
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if parsed != nil {
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parsedIPs = append(parsedIPs, parsed.IP())
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}
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if len(ip) == net.IPv4len {
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ipv4 = append(ipv4, ip)
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}
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if len(ip) == net.IPv6len {
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ipv6 = append(ipv6, ip)
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}
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}
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switch {
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case option.IPv4Enable && option.IPv6Enable:
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if len(parsedIPs) > 0 {
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return parsedIPs, nil
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}
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case option.IPv4Enable:
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if len(ipv4) > 0 {
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return ipv4, nil
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}
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case option.IPv6Enable:
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if len(ipv6) > 0 {
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return ipv6, nil
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}
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}
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return nil, dns.ErrEmptyResponse
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}
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// New create a new dns.Client that queries localhost for DNS.
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func New() *Client {
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return &Client{}
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}
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