新增ECH客户端支持 #3162
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| //go:build go1.23 | ||
| // +build go1.23 | ||
|
|
||
| package tls | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "crypto/tls" | ||
| "io" | ||
| "net/http" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/miekg/dns" | ||
| "github.com/v2fly/v2ray-core/v5/common/net" | ||
| "github.com/v2fly/v2ray-core/v5/transport/internet" | ||
| ) | ||
|
|
||
| func ApplyECH(c *Config, config *tls.Config) error { | ||
| var ECHConfig []byte | ||
| var err error | ||
|
|
||
| if len(c.EchConfig) > 0 { | ||
| ECHConfig = c.EchConfig | ||
| } else { // ECH config > DOH lookup | ||
| if config.ServerName == "" { | ||
| return newError("Using DOH for ECH needs serverName") | ||
| } | ||
| ECHConfig, err = QueryRecord(c.ServerName, c.Ech_DOHserver) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| config.EncryptedClientHelloConfigList = ECHConfig | ||
| return nil | ||
| } | ||
|
|
||
| type record struct { | ||
| record []byte | ||
| expire time.Time | ||
| } | ||
|
|
||
| var ( | ||
| dnsCache = make(map[string]record) | ||
| mutex sync.RWMutex | ||
| ) | ||
|
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||
| func QueryRecord(domain string, server string) ([]byte, error) { | ||
| mutex.Lock() | ||
| rec, found := dnsCache[domain] | ||
| if found && rec.expire.After(time.Now()) { | ||
| mutex.Unlock() | ||
| return rec.record, nil | ||
| } | ||
| mutex.Unlock() | ||
|
|
||
| newError("Trying to query ECH config for domain: ", domain, " with ECH server: ", server).AtDebug().WriteToLog() | ||
| record, ttl, err := dohQuery(server, domain) | ||
| if err != nil { | ||
| return []byte{}, err | ||
| } | ||
|
|
||
| if ttl < 600 { | ||
| ttl = 600 | ||
| } | ||
|
|
||
| mutex.Lock() | ||
| defer mutex.Unlock() | ||
| rec.record = record | ||
| rec.expire = time.Now().Add(time.Second * time.Duration(ttl)) | ||
| dnsCache[domain] = rec | ||
| return record, nil | ||
| } | ||
|
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| func dohQuery(server string, domain string) ([]byte, uint32, error) { | ||
| m := new(dns.Msg) | ||
| m.SetQuestion(dns.Fqdn(domain), dns.TypeHTTPS) | ||
| m.Id = 0 | ||
| msg, err := m.Pack() | ||
| if err != nil { | ||
| return []byte{}, 0, err | ||
| } | ||
| tr := &http.Transport{ | ||
| IdleConnTimeout: 90 * time.Second, | ||
| ForceAttemptHTTP2: true, | ||
| DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) { | ||
| dest, err := net.ParseDestination(network + ":" + addr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| conn, err := internet.DialSystem(ctx, dest, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return conn, nil | ||
| }, | ||
| } | ||
| client := &http.Client{ | ||
| Timeout: 5 * time.Second, | ||
| Transport: tr, | ||
| } | ||
| req, err := http.NewRequest("POST", server, bytes.NewReader(msg)) | ||
| if err != nil { | ||
| return []byte{}, 0, err | ||
| } | ||
| req.Header.Set("Content-Type", "application/dns-message") | ||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| return []byte{}, 0, err | ||
| } | ||
| defer resp.Body.Close() | ||
| respBody, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return []byte{}, 0, err | ||
| } | ||
| if resp.StatusCode != http.StatusOK { | ||
| return []byte{}, 0, newError("query failed with response code:", resp.StatusCode) | ||
| } | ||
| respMsg := new(dns.Msg) | ||
| err = respMsg.Unpack(respBody) | ||
| if err != nil { | ||
| return []byte{}, 0, err | ||
| } | ||
| if len(respMsg.Answer) > 0 { | ||
| for _, answer := range respMsg.Answer { | ||
| if https, ok := answer.(*dns.HTTPS); ok && https.Hdr.Name == dns.Fqdn(domain) { | ||
| for _, v := range https.Value { | ||
| if echConfig, ok := v.(*dns.SVCBECHConfig); ok { | ||
| newError(context.Background(), "Get ECH config:", echConfig.String(), " TTL:", respMsg.Answer[0].Header().Ttl).AtDebug().WriteToLog() | ||
| return echConfig.ECH, answer.Header().Ttl, nil | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return []byte{}, 0, newError("no ech record found") | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| //go:build !go1.23 | ||
| // +build !go1.23 | ||
|
|
||
| package tls | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| ) | ||
|
|
||
| func ApplyECH(c *Config, config *tls.Config) error { | ||
| return newError("using ECH require go 1.23 or higher") | ||
| } | ||
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consider the situation that server address will be filled into
config.ServerNameif noc.ServerNamespecified and server address is a domain name, should useECHConfig, err = QueryRecord(config.ServerName, c.Ech_DOHserver)here.