119 lines
2.1 KiB
Go
119 lines
2.1 KiB
Go
package resolver
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import (
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"errors"
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"net"
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"strings"
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"github.com/Dreamacro/clash/component/trie"
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)
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var (
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// DefaultResolver aim to resolve ip
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DefaultResolver Resolver
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// DefaultHosts aim to resolve hosts
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DefaultHosts = trie.New()
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)
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var (
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ErrIPNotFound = errors.New("couldn't find ip")
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ErrIPVersion = errors.New("ip version error")
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)
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type Resolver interface {
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ResolveIP(host string) (ip net.IP, err error)
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ResolveIPv4(host string) (ip net.IP, err error)
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ResolveIPv6(host string) (ip net.IP, err error)
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}
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// ResolveIPv4 with a host, return ipv4
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func ResolveIPv4(host string) (net.IP, error) {
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if node := DefaultHosts.Search(host); node != nil {
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if ip := node.Data.(net.IP).To4(); ip != nil {
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return ip, nil
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}
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}
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ip := net.ParseIP(host)
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if ip != nil {
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if !strings.Contains(host, ":") {
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return ip, nil
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}
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return nil, ErrIPVersion
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}
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if DefaultResolver != nil {
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return DefaultResolver.ResolveIPv4(host)
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}
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ipAddrs, 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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for _, ip := range ipAddrs {
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if ip4 := ip.To4(); ip4 != nil {
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return ip4, nil
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}
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}
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return nil, ErrIPNotFound
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}
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// ResolveIPv6 with a host, return ipv6
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func ResolveIPv6(host string) (net.IP, error) {
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if node := DefaultHosts.Search(host); node != nil {
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if ip := node.Data.(net.IP).To16(); ip != nil {
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return ip, nil
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}
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}
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ip := net.ParseIP(host)
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if ip != nil {
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if strings.Contains(host, ":") {
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return ip, nil
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}
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return nil, ErrIPVersion
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}
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if DefaultResolver != nil {
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return DefaultResolver.ResolveIPv6(host)
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}
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ipAddrs, 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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for _, ip := range ipAddrs {
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if ip.To4() == nil {
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return ip, nil
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}
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}
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return nil, ErrIPNotFound
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}
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// ResolveIP with a host, return ip
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func ResolveIP(host string) (net.IP, error) {
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if node := DefaultHosts.Search(host); node != nil {
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return node.Data.(net.IP), nil
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}
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if DefaultResolver != nil {
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return DefaultResolver.ResolveIP(host)
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}
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ip := net.ParseIP(host)
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if ip != nil {
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return ip, nil
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}
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ipAddr, err := net.ResolveIPAddr("ip", host)
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if err != nil {
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return nil, err
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}
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return ipAddr.IP, nil
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}
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