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client.go
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client.go
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package localdns
import (
"context"
"v2ray.com/core/common/net"
"v2ray.com/core/features/dns"
)
// Client is an implementation of dns.Client, which queries localhost for DNS.
type Client struct {
resolver net.Resolver
}
// 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 (c *Client) LookupIP(host string) ([]net.IP, error) {
ipAddr, err := c.resolver.LookupIPAddr(context.Background(), host)
if err != nil {
return nil, err
}
ips := make([]net.IP, 0, len(ipAddr))
for _, addr := range ipAddr {
ips = append(ips, addr.IP)
}
return ips, nil
}
// LookupIPv4 implements IPv4Lookup.
func (c *Client) LookupIPv4(host string) ([]net.IP, error) {
ips, err := c.LookupIP(host)
if err != nil {
return nil, err
}
var ipv4 []net.IP
for _, ip := range ips {
parsed := net.IPAddress(ip)
if parsed.Family().IsIPv4() {
ipv4 = append(ipv4, parsed.IP())
}
}
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
}
var ipv6 []net.IP
for _, ip := range ips {
parsed := net.IPAddress(ip)
if parsed.Family().IsIPv6() {
ipv6 = append(ipv6, parsed.IP())
}
}
return ipv6, nil
}
// New create a new dns.Client that queries localhost for DNS.
func New() *Client {
return &Client{
resolver: net.Resolver{
PreferGo: true,
},
}
}