From 3f40089cafb3cfc86a568896a9ffad3d707b3358 Mon Sep 17 00:00:00 2001 From: Loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com> Date: Fri, 9 Apr 2021 10:35:26 +0800 Subject: [PATCH] Feat: add disableFallback & skipFallback option for DNS (#864) --- app/dns/config.pb.go | 191 +++++++++++++++++++++++------------------ app/dns/config.proto | 5 +- app/dns/dns.go | 57 +++++++----- app/dns/nameserver.go | 11 ++- infra/conf/dns.go | 42 +++++---- infra/conf/dns_test.go | 14 +-- 6 files changed, 184 insertions(+), 136 deletions(-) diff --git a/app/dns/config.pb.go b/app/dns/config.pb.go index 948d21f77..bde69bdd7 100644 --- a/app/dns/config.pb.go +++ b/app/dns/config.pb.go @@ -130,6 +130,7 @@ type NameServer struct { Address *net.Endpoint `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"` ClientIp []byte `protobuf:"bytes,5,opt,name=client_ip,json=clientIp,proto3" json:"client_ip,omitempty"` + SkipFallback bool `protobuf:"varint,6,opt,name=skipFallback,proto3" json:"skipFallback,omitempty"` PrioritizedDomain []*NameServer_PriorityDomain `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"` Geoip []*router.GeoIP `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"` OriginalRules []*NameServer_OriginalRule `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"` @@ -181,6 +182,13 @@ func (x *NameServer) GetClientIp() []byte { return nil } +func (x *NameServer) GetSkipFallback() bool { + if x != nil { + return x.SkipFallback + } + return false +} + func (x *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain { if x != nil { return x.PrioritizedDomain @@ -226,9 +234,10 @@ type Config struct { StaticHosts []*Config_HostMapping `protobuf:"bytes,4,rep,name=static_hosts,json=staticHosts,proto3" json:"static_hosts,omitempty"` // Tag is the inbound tag of DNS client. Tag string `protobuf:"bytes,6,opt,name=tag,proto3" json:"tag,omitempty"` - // DisableCache Disable DNS cache - DisableCache bool `protobuf:"varint,8,opt,name=disableCache,proto3" json:"disableCache,omitempty"` - QueryStrategy QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=v2ray.core.app.dns.QueryStrategy" json:"query_strategy,omitempty"` + // DisableCache disables DNS cache + DisableCache bool `protobuf:"varint,8,opt,name=disableCache,proto3" json:"disableCache,omitempty"` + QueryStrategy QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=v2ray.core.app.dns.QueryStrategy" json:"query_strategy,omitempty"` + DisableFallback bool `protobuf:"varint,10,opt,name=disableFallback,proto3" json:"disableFallback,omitempty"` } func (x *Config) Reset() { @@ -321,6 +330,13 @@ func (x *Config) GetQueryStrategy() QueryStrategy { return QueryStrategy_USE_IP } +func (x *Config) GetDisableFallback() bool { + if x != nil { + return x.DisableFallback + } + return false +} + type NameServer_PriorityDomain struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -515,95 +531,100 @@ var file_app_dns_config_proto_rawDesc = []byte{ 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x1c, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x6e, 0x65, 0x74, 0x2f, 0x64, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x17, 0x61, 0x70, 0x70, 0x2f, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x2f, 0x63, - 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xe8, 0x03, 0x0a, 0x0a, + 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x8c, 0x04, 0x0a, 0x0a, 0x4e, 0x61, 0x6d, 0x65, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x12, 0x39, 0x0a, 0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1f, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6e, 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v2ray.core.common.net.Endpoint address = 1; bytes client_ip = 5; + bool skipFallback = 6; message PriorityDomain { DomainMatchingType type = 1; @@ -78,8 +79,10 @@ message Config { reserved 7; - // DisableCache Disable DNS cache + // DisableCache disables DNS cache bool disableCache = 8; QueryStrategy query_strategy = 9; + + bool disableFallback = 10; } diff --git a/app/dns/dns.go b/app/dns/dns.go index 2966b1397..1badb3e09 100644 --- a/app/dns/dns.go +++ b/app/dns/dns.go @@ -24,14 +24,15 @@ import ( // DNS is a DNS rely server. type DNS struct { sync.Mutex - tag string - disableCache bool - ipOption *dns.IPOption - hosts *StaticHosts - clients []*Client - ctx context.Context - domainMatcher strmatcher.IndexMatcher - matcherInfos []DomainMatcherInfo + tag string + disableCache bool + disableFallback bool + ipOption *dns.IPOption + hosts *StaticHosts + clients []*Client + ctx context.Context + domainMatcher strmatcher.IndexMatcher + matcherInfos []DomainMatcherInfo } // DomainMatcherInfo contains information attached to index returned by Server.domainMatcher @@ -133,14 +134,15 @@ func New(ctx context.Context, config *Config) (*DNS, error) { } return &DNS{ - tag: tag, - hosts: hosts, - ipOption: ipOption, - clients: clients, - ctx: ctx, - domainMatcher: domainMatcher, - matcherInfos: matcherInfos, - disableCache: config.DisableCache, + tag: tag, + hosts: hosts, + ipOption: ipOption, + clients: clients, + ctx: ctx, + domainMatcher: domainMatcher, + matcherInfos: matcherInfos, + disableCache: config.DisableCache, + disableFallback: config.DisableFallback, }, nil } @@ -276,14 +278,16 @@ func (s *DNS) sortClients(domain string) []*Client { clientNames = append(clientNames, client.Name()) } - // Default round-robin query - for idx, client := range s.clients { - if clientUsed[idx] { - continue + if !s.disableFallback { + // Default round-robin query + for idx, client := range s.clients { + if clientUsed[idx] || client.skipFallback { + continue + } + clientUsed[idx] = true + clients = append(clients, client) + clientNames = append(clientNames, client.Name()) } - clientUsed[idx] = true - clients = append(clients, client) - clientNames = append(clientNames, client.Name()) } if len(domainRules) > 0 { @@ -292,6 +296,13 @@ func (s *DNS) sortClients(domain string) []*Client { if len(clientNames) > 0 { newError("domain ", domain, " will use DNS in order: ", clientNames).AtDebug().WriteToLog() } + + if len(clients) == 0 { + clients = append(clients, s.clients[0]) + clientNames = append(clientNames, s.clients[0].Name()) + newError("domain ", domain, " will use the first DNS: ", clientNames).AtDebug().WriteToLog() + } + return clients } diff --git a/app/dns/nameserver.go b/app/dns/nameserver.go index f886c51d8..9f40b750a 100644 --- a/app/dns/nameserver.go +++ b/app/dns/nameserver.go @@ -27,10 +27,11 @@ type Server interface { // Client is the interface for DNS client. type Client struct { - server Server - clientIP net.IP - domains []string - expectIPs []*router.GeoIPMatcher + server Server + clientIP net.IP + skipFallback bool + domains []string + expectIPs []*router.GeoIPMatcher } var errExpectedIPNonMatch = errors.New("expectIPs not match") @@ -67,6 +68,7 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err // NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs. func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container router.GeoIPMatcherContainer, matcherInfos *[]DomainMatcherInfo, updateDomainRule func(strmatcher.Matcher, int, []DomainMatcherInfo) error) (*Client, error) { client := &Client{} + err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error { // Create a new server for each client for now server, err := NewServer(ns.Address.AsDestination(), dispatcher) @@ -144,6 +146,7 @@ func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container r client.server = server client.clientIP = clientIP + client.skipFallback = ns.SkipFallback client.domains = rules client.expectIPs = matchers return nil diff --git a/infra/conf/dns.go b/infra/conf/dns.go index ef214846b..17726d251 100644 --- a/infra/conf/dns.go +++ b/infra/conf/dns.go @@ -11,11 +11,12 @@ import ( ) type NameServerConfig struct { - Address *Address - ClientIP *Address - Port uint16 - Domains []string - ExpectIPs StringList + Address *Address + ClientIP *Address + Port uint16 + SkipFallback bool + Domains []string + ExpectIPs StringList } func (c *NameServerConfig) UnmarshalJSON(data []byte) error { @@ -26,16 +27,18 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error { } var advanced struct { - Address *Address `json:"address"` - ClientIP *Address `json:"clientIp"` - Port uint16 `json:"port"` - Domains []string `json:"domains"` - ExpectIPs StringList `json:"expectIps"` + Address *Address `json:"address"` + ClientIP *Address `json:"clientIp"` + Port uint16 `json:"port"` + SkipFallback bool `json:"skipFallback"` + Domains []string `json:"domains"` + ExpectIPs StringList `json:"expectIps"` } if err := json.Unmarshal(data, &advanced); err == nil { c.Address = advanced.Address c.ClientIP = advanced.ClientIP c.Port = advanced.Port + c.SkipFallback = advanced.SkipFallback c.Domains = advanced.Domains c.ExpectIPs = advanced.ExpectIPs return nil @@ -105,6 +108,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) { Port: uint32(c.Port), }, ClientIp: myClientIP, + SkipFallback: c.SkipFallback, PrioritizedDomain: domains, Geoip: geoipList, OriginalRules: originalRules, @@ -120,12 +124,13 @@ var typeMap = map[router.Domain_Type]dns.DomainMatchingType{ // DNSConfig is a JSON serializable object for dns.Config. type DNSConfig struct { - Servers []*NameServerConfig `json:"servers"` - Hosts map[string]*Address `json:"hosts"` - ClientIP *Address `json:"clientIp"` - Tag string `json:"tag"` - QueryStrategy string `json:"queryStrategy"` - DisableCache bool `json:"disableCache"` + Servers []*NameServerConfig `json:"servers"` + Hosts map[string]*Address `json:"hosts"` + ClientIP *Address `json:"clientIp"` + Tag string `json:"tag"` + QueryStrategy string `json:"queryStrategy"` + DisableCache bool `json:"disableCache"` + DisableFallback bool `json:"disableFallback"` } func getHostMapping(addr *Address) *dns.Config_HostMapping { @@ -142,8 +147,9 @@ func getHostMapping(addr *Address) *dns.Config_HostMapping { // Build implements Buildable func (c *DNSConfig) Build() (*dns.Config, error) { config := &dns.Config{ - Tag: c.Tag, - DisableCache: c.DisableCache, + Tag: c.Tag, + DisableCache: c.DisableCache, + DisableFallback: c.DisableFallback, } if c.ClientIP != nil { diff --git a/infra/conf/dns_test.go b/infra/conf/dns_test.go index fb8380163..a99f0c93f 100644 --- a/infra/conf/dns_test.go +++ b/infra/conf/dns_test.go @@ -64,6 +64,7 @@ func TestDNSConfigParsing(t *testing.T) { "address": "8.8.8.8", "clientIp": "10.0.0.1", "port": 5353, + "skipFallback": true, "domains": ["domain:v2fly.org"] }], "hosts": { @@ -75,7 +76,8 @@ func TestDNSConfigParsing(t *testing.T) { }, "clientIp": "10.0.0.1", "queryStrategy": "UseIPv4", - "disableCache": true + "disableCache": true, + "disableFallback": true }`, Parser: parserCreator(), Output: &dns.Config{ @@ -90,7 +92,8 @@ func TestDNSConfigParsing(t *testing.T) { Network: net.Network_UDP, Port: 5353, }, - ClientIp: []byte{10, 0, 0, 1}, + ClientIp: []byte{10, 0, 0, 1}, + SkipFallback: true, PrioritizedDomain: []*dns.NameServer_PriorityDomain{ { Type: dns.DomainMatchingType_Subdomain, @@ -132,9 +135,10 @@ func TestDNSConfigParsing(t *testing.T) { Ip: [][]byte{{127, 0, 0, 1}}, }, }, - ClientIp: []byte{10, 0, 0, 1}, - QueryStrategy: dns.QueryStrategy_USE_IP4, - DisableCache: true, + ClientIp: []byte{10, 0, 0, 1}, + QueryStrategy: dns.QueryStrategy_USE_IP4, + DisableCache: true, + DisableFallback: true, }, }, })