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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package dns | ||
|
|
||
| import ( | ||
| "strconv" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/mrhaoxx/OpenNG/log" | ||
|
|
||
| "github.com/dlclark/regexp2" | ||
| "github.com/miekg/dns" | ||
| ) | ||
|
|
||
| type record struct { | ||
| rr dns.RR | ||
| name *regexp2.Regexp | ||
| } | ||
| type filter struct { | ||
| name *regexp2.Regexp | ||
| allowance bool | ||
| } | ||
|
|
||
| type server struct { | ||
| records []*record | ||
| records_lock sync.RWMutex | ||
| filters []*filter | ||
| upstreamDNS string | ||
|
|
||
| count uint64 | ||
| } | ||
|
|
||
| func (s *server) ServeDNS(w dns.ResponseWriter, req *dns.Msg) { | ||
| m := new(dns.Msg) | ||
| m.SetReply(req) | ||
| id := atomic.AddUint64(&s.count, 1) | ||
| startTime := time.Now() | ||
| defer func() { | ||
| log.Println("d"+strconv.FormatUint(id, 10), w.RemoteAddr().String(), time.Since(startTime).Round(1*time.Microsecond), m.Rcode, m.Question[0].Name, m.Answer) | ||
| }() | ||
|
|
||
| for _, q := range req.Question { | ||
| for _, r := range s.filters { | ||
| if ok, _ := r.name.MatchString(q.Name); ok { | ||
| if r.allowance { | ||
| m.Rcode = dns.RcodeSuccess | ||
| break | ||
| } else { | ||
| m.Rcode = dns.RcodeRefused | ||
| goto _end | ||
| } | ||
| } | ||
| } | ||
| } | ||
| { | ||
| c := new(dns.Client) | ||
| in, _, _ := c.Exchange(req, s.upstreamDNS) | ||
| w.WriteMsg(in) | ||
| return | ||
| } | ||
| _end: | ||
| w.WriteMsg(m) | ||
| } | ||
|
|
||
| func (s *server) Listen(address string) error { | ||
| server := &dns.Server{Addr: address, Net: "udp"} | ||
| server.Handler = s | ||
| return server.ListenAndServe() | ||
| } | ||
|
|
||
| func (s *server) AddFilter(name *regexp2.Regexp, allowance bool) error { | ||
| s.filters = append(s.filters, &filter{name: name, allowance: allowance}) | ||
| return nil | ||
| } | ||
|
|
||
| // func (s *server) AddRecord(domain string, rr dns.RR) error { | ||
| // r, err := regexp2.Compile(domain, 0) | ||
| // if err != nil { | ||
| // return err | ||
| // } | ||
| // s.records_lock.Lock() | ||
| // s.records = append(s.records, &record{rr: rr, domain: r}) | ||
| // s.records_lock.Unlock() | ||
| // return nil | ||
| // } | ||
|
|
||
| func NewServer(upstreamDNS string) *server { | ||
| return &server{ | ||
| records: []*record{}, | ||
| filters: []*filter{}, | ||
| upstreamDNS: upstreamDNS, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| package dns | ||
|
|
||
| import "strings" | ||
|
|
||
| func Dnsnames2Regexps(dnsnames []string) []string { | ||
| var out []string | ||
| for _, v := range dnsnames { | ||
| v = strings.ReplaceAll(v, ".", "\\.") | ||
| v = strings.ReplaceAll(v, "*", ".*") | ||
| out = append(out, "^"+v+"$") | ||
| } | ||
| return out | ||
| } | ||
| func Dnsname2Regexp(dnsname string) (v string) { | ||
| v = strings.ReplaceAll(dnsname, ".", "\\.") | ||
| v = strings.ReplaceAll(v, "*", ".*") | ||
| return "^" + v + "$" | ||
| } |
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