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https://github.com/v2fly/v2ray-core.git
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f8ac919d66
* Move `filterIP` from `hosts.go` to `dnscommon.go` * Implement adding pools for fakedns.HolderMulti * Implement per-client fakedns for DNS app * Remove `dns.ClientWithIPOption` and replace with new programming model * Implement JSON config support for new fakedns config * Fix lint and tests * Fix some codacy analysis
105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
package dns
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import (
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"github.com/v2fly/v2ray-core/v5/common/errors"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/serial"
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"github.com/v2fly/v2ray-core/v5/features"
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)
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// IPOption is an object for IP query options.
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type IPOption struct {
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IPv4Enable bool
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IPv6Enable bool
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FakeEnable bool
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}
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func (opt IPOption) With(other IPOption) IPOption {
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return IPOption{
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IPv4Enable: opt.IPv4Enable && other.IPv4Enable,
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IPv6Enable: opt.IPv6Enable && other.IPv6Enable,
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FakeEnable: opt.FakeEnable && other.FakeEnable,
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}
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}
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func (opt IPOption) IsValid() bool {
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return opt.IPv4Enable || opt.IPv6Enable
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}
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// Client is a V2Ray feature for querying DNS information.
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//
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// v2ray:api:stable
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type Client interface {
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features.Feature
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// LookupIP returns IP address for the given domain. IPs may contain IPv4 and/or IPv6 addresses.
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LookupIP(domain string) ([]net.IP, error)
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}
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// IPv4Lookup is an optional feature for querying IPv4 addresses only.
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//
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// v2ray:api:beta
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type IPv4Lookup interface {
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LookupIPv4(domain string) ([]net.IP, error)
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}
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// IPv6Lookup is an optional feature for querying IPv6 addresses only.
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//
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// v2ray:api:beta
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type IPv6Lookup interface {
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LookupIPv6(domain string) ([]net.IP, error)
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}
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// LookupIPWithOption is a helper function for querying DNS information from a dns.Client with dns.IPOption.
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//
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// v2ray:api:beta
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func LookupIPWithOption(client Client, domain string, option IPOption) ([]net.IP, error) {
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if option.FakeEnable {
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if clientWithFakeDNS, ok := client.(ClientWithFakeDNS); ok {
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client = clientWithFakeDNS.AsFakeDNSClient()
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}
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}
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if option.IPv4Enable && !option.IPv6Enable {
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if ipv4Lookup, ok := client.(IPv4Lookup); ok {
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return ipv4Lookup.LookupIPv4(domain)
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} else {
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return nil, errors.New("dns.Client doesn't implement IPv4Lookup")
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}
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}
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if option.IPv6Enable && !option.IPv4Enable {
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if ipv6Lookup, ok := client.(IPv6Lookup); ok {
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return ipv6Lookup.LookupIPv6(domain)
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} else {
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return nil, errors.New("dns.Client doesn't implement IPv6Lookup")
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}
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}
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return client.LookupIP(domain)
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}
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// ClientType returns the type of Client interface. Can be used for implementing common.HasType.
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//
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// v2ray:api:beta
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func ClientType() interface{} {
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return (*Client)(nil)
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}
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// ErrEmptyResponse indicates that DNS query succeeded but no answer was returned.
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var ErrEmptyResponse = errors.New("empty response")
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type RCodeError uint16
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func (e RCodeError) Error() string {
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return serial.Concat("rcode: ", uint16(e))
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}
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func RCodeFromError(err error) uint16 {
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if err == nil {
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return 0
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}
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cause := errors.Cause(err)
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if r, ok := cause.(RCodeError); ok {
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return uint16(r)
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}
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return 0
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}
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