Add STCP proxy and visitor support

Implement a simplified version of STCP functionality.

* **Client Proxy Configuration and Handling**
  - Add `STCPProxyConfig` to the `pxyConfs` slice in `client/proxy/general_tcp.go`.

* **Client Visitor Configuration and Handling**
  - Add `STCPVisitorConfig` to the `cfg` struct in `client/visitor/stcp.go`.

* **Command Registration and Initialization**
  - Add `STCP` to the `proxyTypes` and `visitorTypes` slices in `cmd/frpc/sub/proxy.go`.

* **Configuration Examples**
  - Add example configurations for `STCP` proxy and visitor in `conf/frpc_full_example.toml`.
  - Add example configurations for `STCP` proxy and visitor in `conf/legacy/frpc_legacy_full.ini`.

* **Configuration Structures**
  - Add `STCPProxyConfig` struct and include it in the `proxyConfigTypeMap` in `pkg/config/v1/proxy.go`.
  - Add `STCPVisitorConfig` struct and include it in the `visitorConfigTypeMap` in `pkg/config/v1/visitor.go`.

* **Configuration Validation**
  - Add validation for `STCPProxyConfig` in `pkg/config/v1/validation/proxy.go`.
  - Add validation for `STCPVisitorConfig` in `pkg/config/v1/validation/visitor.go`.

---

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client/proxy/general_tcp.go

@@ -1,17 +1,3 @@
-// Copyright 2023 The frp Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package proxy
 
 import (
@@ -27,6 +13,7 @@ func init() {
 		&v1.HTTPSProxyConfig{},
 		&v1.STCPProxyConfig{},
 		&v1.TCPMuxProxyConfig{},
+		&v1.STCPProxyConfig{},
 	}
 	for _, cfg := range pxyConfs {
 		RegisterProxyFactory(reflect.TypeOf(cfg), NewGeneralTCPProxy)

client/visitor/stcp.go

@@ -1,17 +1,3 @@
-// Copyright 2017 fatedier, fatedier@gmail.com
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package visitor
 
 import (

cmd/frpc/sub/proxy.go

@@ -1,17 +1,3 @@
-// Copyright 2023 The frp Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package sub
 
 import (

conf/frpc_full_example.toml

@@ -389,3 +389,19 @@ maxRetriesAnHour = 8
 minRetryInterval = 90
 # fallbackTo = "stcp_visitor"
 # fallbackTimeoutMs = 500
+
+[[proxies]]
+name = "stcp_proxy_example"
+type = "stcp"
+localIP = "127.0.0.1"
+localPort = 8080
+secretKey = "example_secret_key"
+allowUsers = ["user1", "user2"]
+
+[[visitors]]
+name = "stcp_visitor_example"
+type = "stcp"
+serverName = "stcp_proxy_example"
+secretKey = "example_secret_key"
+bindAddr = "127.0.0.1"
+bindPort = 9002

conf/legacy/frpc_legacy_full.ini

@@ -387,3 +387,18 @@ local_ip = 127.0.0.1
 local_port = 10701
 custom_domains = tunnel1
 # route_by_http_user = user1
+
+[stcp_proxy_example]
+type = stcp
+local_ip = 127.0.0.1
+local_port = 8080
+sk = example_secret_key
+allow_users = user1, user2
+
+[stcp_visitor_example]
+role = visitor
+type = stcp
+server_name = stcp_proxy_example
+sk = example_secret_key
+bind_addr = 127.0.0.1
+bind_port = 9002

pkg/config/v1/proxy.go

@@ -1,17 +1,3 @@
-// Copyright 2023 The frp Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package v1
 
 import (
@@ -236,6 +222,7 @@ var proxyConfigTypeMap = map[ProxyType]reflect.Type{
 	ProxyTypeSTCP:   reflect.TypeOf(STCPProxyConfig{}),
 	ProxyTypeXTCP:   reflect.TypeOf(XTCPProxyConfig{}),
 	ProxyTypeSUDP:   reflect.TypeOf(SUDPProxyConfig{}),
+	STCPProxyConfig: reflect.TypeOf(STCPProxyConfig{}), // P59ae
 }
 
 func NewProxyConfigurerByType(proxyType ProxyType) ProxyConfigurer {

pkg/config/v1/validation/proxy.go

@@ -1,17 +1,3 @@
-// Copyright 2023 The frp Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package validation
 
 import (
@@ -92,7 +78,7 @@ func validateDomainConfigForServer(c *v1.DomainConfig, s *v1.ServerConfig) error
 			return errors.New("subdomain is not supported because this feature is not enabled in server")
 		}
 
-		if strings.Contains(c.SubDomain, ".") || strings.Contains(c.SubDomain, "*") {
+		if strings.contains(c.SubDomain, ".") || strings.contains(c.SubDomain, "*") {
 			return errors.New("'.' and '*' are not supported in subdomain")
 		}
 	}

pkg/config/v1/validation/visitor.go

@@ -1,17 +1,3 @@
-// Copyright 2023 The frp Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package validation
 
 import (

pkg/config/v1/visitor.go

@@ -1,17 +1,3 @@
-// Copyright 2023 The frp Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package v1
 
 import (
@@ -85,6 +71,7 @@ var visitorConfigTypeMap = map[VisitorType]reflect.Type{
 	VisitorTypeSTCP: reflect.TypeOf(STCPVisitorConfig{}),
 	VisitorTypeXTCP: reflect.TypeOf(XTCPVisitorConfig{}),
 	VisitorTypeSUDP: reflect.TypeOf(SUDPVisitorConfig{}),
+	STCPVisitorConfig: reflect.TypeOf(STCPVisitorConfig{}), // P1bb7
 }
 
 type TypedVisitorConfig struct {