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Code Issues Releases Activity

Add Fake DNS support (#309)

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Co-authored-by: Xiaokang Wang <xiaokangwang@outlook.com>
Co-authored-by: loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
Co-authored-by: kslr <kslrwang@gmail.com>
This commit is contained in:
yuhan6665
2021-03-06 23:39:50 -05:00
committed by GitHub
parent db32ce6fd9
commit f50eff5ebb
43 changed files with 1351 additions and 301 deletions
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49
app/dns/server.go
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@ -31,6 +31,7 @@ type Server struct {
hosts *StaticHosts
clientIP net.IP
clients []Client // clientIdx -> Client
ctx context.Context
ipIndexMap []*MultiGeoIPMatcher // clientIdx -> *MultiGeoIPMatcher
domainRules [][]string // clientIdx -> domainRuleIdx -> DomainRule
domainMatcher strmatcher.IndexMatcher
@ -75,6 +76,7 @@ func generateRandomTag() string {
func New(ctx context.Context, config *Config) (*Server, error) {
server := &Server{
clients: make([]Client, 0, len(config.NameServers)+len(config.NameServer)),
ctx: ctx,
tag: config.Tag,
}
if server.tag == "" {
@ -144,6 +146,9 @@ func New(ctx context.Context, config *Config) (*Server, error) {
server.clients[idx] = c
}))
case address.Family().IsDomain() && address.Domain() == "fakedns":
server.clients = append(server.clients, NewFakeDNSServer())
default:
// UDP classic DNS mode
dest := endpoint.AsDestination()
@ -295,8 +300,8 @@ func (s *Server) Match(idx int, client Client, domain string, ips []net.IP) ([]n
return newIps, nil
}
func (s *Server) queryIPTimeout(idx int, client Client, domain string, option IPOption) ([]net.IP, error) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
func (s *Server) queryIPTimeout(idx int, client Client, domain string, option dns.IPOption) ([]net.IP, error) {
ctx, cancel := context.WithTimeout(s.ctx, time.Second*4)
if len(s.tag) > 0 {
ctx = session.ContextWithInbound(ctx, &session.Inbound{
Tag: s.tag,
@ -314,31 +319,7 @@ func (s *Server) queryIPTimeout(idx int, client Client, domain string, option IP
return ips, err
}
// LookupIP implements dns.Client.
func (s *Server) LookupIP(domain string) ([]net.IP, error) {
return s.lookupIPInternal(domain, IPOption{
IPv4Enable: true,
IPv6Enable: true,
})
}
// LookupIPv4 implements dns.IPv4Lookup.
func (s *Server) LookupIPv4(domain string) ([]net.IP, error) {
return s.lookupIPInternal(domain, IPOption{
IPv4Enable: true,
IPv6Enable: false,
})
}
// LookupIPv6 implements dns.IPv6Lookup.
func (s *Server) LookupIPv6(domain string) ([]net.IP, error) {
return s.lookupIPInternal(domain, IPOption{
IPv4Enable: false,
IPv6Enable: true,
})
}
func (s *Server) lookupStatic(domain string, option IPOption, depth int32) []net.Address {
func (s *Server) lookupStatic(domain string, option dns.IPOption, depth int32) []net.Address {
ips := s.hosts.LookupIP(domain, option)
if ips == nil {
return nil
@ -362,14 +343,15 @@ func toNetIP(ips []net.Address) []net.IP {
return netips
}
func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, error) {
// LookupIP implements dns.Client.
func (s *Server) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
if domain == "" {
return nil, newError("empty domain name")
}
domain = strings.ToLower(domain)
// normalize the FQDN form query
if domain[len(domain)-1] == '.' {
if strings.HasSuffix(domain, ".") {
domain = domain[:len(domain)-1]
}
@ -406,6 +388,10 @@ func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, err
for _, idx := range indices {
clientIdx := int(s.matcherInfos[idx].clientIdx)
matchedClient = s.clients[clientIdx]
if !option.FakeEnable && strings.EqualFold(matchedClient.Name(), "FakeDNS") {
newError("skip DNS resolution for domain ", domain, " at server ", matchedClient.Name()).AtDebug().WriteToLog()
continue
}
ips, err := s.queryIPTimeout(clientIdx, matchedClient, domain, option)
if len(ips) > 0 {
return ips, nil
@ -425,7 +411,10 @@ func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, err
newError("domain ", domain, " at server ", client.Name(), " idx:", idx, " already lookup failed, just ignore").AtDebug().WriteToLog()
continue
}
if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
newError("skip DNS resolution for domain ", domain, " at server ", client.Name()).AtDebug().WriteToLog()
continue
}
ips, err := s.queryIPTimeout(idx, client, domain, option)
if len(ips) > 0 {
return ips, nil