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