package v4
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import (
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"encoding/json"
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"strings"
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"github.com/v2fly/v2ray-core/v5/app/dns/fakedns"
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)
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type FakeDNSPoolElementConfig struct {
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IPPool string `json:"ipPool"`
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LRUSize int64 `json:"poolSize"`
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}
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type FakeDNSConfig struct {
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pool *FakeDNSPoolElementConfig
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pools []*FakeDNSPoolElementConfig
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}
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// UnmarshalJSON implements encoding/json.Unmarshaler.UnmarshalJSON
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func (f *FakeDNSConfig) UnmarshalJSON(data []byte) error {
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var pool FakeDNSPoolElementConfig
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var pools []*FakeDNSPoolElementConfig
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switch {
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case json.Unmarshal(data, &pool) == nil:
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f.pool = &pool
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case json.Unmarshal(data, &pools) == nil:
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f.pools = pools
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default:
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return newError("invalid fakedns config")
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}
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return nil
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}
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func (f *FakeDNSConfig) Build() (*fakedns.FakeDnsPoolMulti, error) {
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fakeDNSPool := fakedns.FakeDnsPoolMulti{}
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if f.pool != nil {
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fakeDNSPool.Pools = append(fakeDNSPool.Pools, &fakedns.FakeDnsPool{
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IpPool: f.pool.IPPool,
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LruSize: f.pool.LRUSize,
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})
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return &fakeDNSPool, nil
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}
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if f.pools != nil {
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for _, v := range f.pools {
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fakeDNSPool.Pools = append(fakeDNSPool.Pools, &fakedns.FakeDnsPool{IpPool: v.IPPool, LruSize: v.LRUSize})
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}
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return &fakeDNSPool, nil
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}
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return nil, newError("no valid FakeDNS config")
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}
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type FakeDNSPostProcessingStage struct{}
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func (FakeDNSPostProcessingStage) Process(config *Config) error {
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fakeDNSInUse := false
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isIPv4Enable, isIPv6Enable := true, true
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if config.DNSConfig != nil {
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for _, v := range config.DNSConfig.Servers {
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if v.Address.Family().IsDomain() && strings.EqualFold(v.Address.Domain(), "fakedns") {
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fakeDNSInUse = true
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}
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}
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switch strings.ToLower(config.DNSConfig.QueryStrategy) {
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case "useip4", "useipv4", "use_ip4", "use_ipv4", "use_ip_v4", "use-ip4", "use-ipv4", "use-ip-v4":
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isIPv4Enable, isIPv6Enable = true, false
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case "useip6", "useipv6", "use_ip6", "use_ipv6", "use_ip_v6", "use-ip6", "use-ipv6", "use-ip-v6":
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isIPv4Enable, isIPv6Enable = false, true
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}
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}
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if fakeDNSInUse {
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// Add a Fake DNS Config if there is none
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if config.FakeDNS == nil {
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config.FakeDNS = &FakeDNSConfig{}
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switch {
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case isIPv4Enable && isIPv6Enable:
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config.FakeDNS.pools = []*FakeDNSPoolElementConfig{
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{
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IPPool: "198.18.0.0/15",
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LRUSize: 32768,
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},
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{
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IPPool: "fc00::/18",
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LRUSize: 32768,
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},
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}
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case !isIPv4Enable && isIPv6Enable:
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config.FakeDNS.pool = &FakeDNSPoolElementConfig{
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IPPool: "fc00::/18",
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LRUSize: 65535,
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}
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case isIPv4Enable && !isIPv6Enable:
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config.FakeDNS.pool = &FakeDNSPoolElementConfig{
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IPPool: "198.18.0.0/15",
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LRUSize: 65535,
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}
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}
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}
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found := false
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// Check if there is a Outbound with necessary sniffer on
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var inbounds []InboundDetourConfig
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if len(config.InboundConfigs) > 0 {
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inbounds = append(inbounds, config.InboundConfigs...)
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}
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for _, v := range inbounds {
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if v.SniffingConfig != nil && v.SniffingConfig.Enabled && v.SniffingConfig.DestOverride != nil {
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for _, dov := range *v.SniffingConfig.DestOverride {
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if strings.EqualFold(dov, "fakedns") || strings.EqualFold(dov, "fakedns+others") {
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found = true
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break
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}
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}
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}
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}
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if !found {
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newError("Defined FakeDNS but haven't enabled FakeDNS destOverride at any inbound.").AtWarning().WriteToLog()
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}
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}
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return nil
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}
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