refactor(net): unique_ptr for connection-lifecycle objects (#11459)

- WiFiServerAPI/ethServerAPI apiPort and ethApiServer's listener are
  create/destroy cycles that repeat across WiFi teardown and W5500
  chip resets; the manual delete+null bookkeeping becomes reset().
  (ethTlsApiServer's listener is left for a follow-up: that file is
  already touched by the partial-init fix PR and converting it here
  would conflict.)

- ContentHandler::handleFormUpload held its body parser raw with
  delete on four separate exit paths of a per-request handler; any
  future early return was a silent leak. unique_ptr removes all four.

- The portduino ch341Hal global becomes unique_ptr. The LoRa-error
  recovery loop's delete/null/new sequence was correct only by
  hand-preserved ordering; it becomes reset()/make_unique. RadioLibHAL
  keeps a non-owning raw pointer, as before.

No behavior change.

src/main.cpp

@@ -1498,14 +1498,13 @@ void loop()
         LOG_ERROR("LoRa error detected, recovering");
         router->addInterface(nullptr);
         if (portduino_config.lora_spi_dev == "ch341") {
-            if (ch341Hal != nullptr) {
-                delete ch341Hal;
-                ch341Hal = nullptr;
+            if (ch341Hal) {
+                ch341Hal.reset();
                 sleep(3);
             }
             try {
-                ch341Hal = new Ch341Hal(0, portduino_config.lora_usb_serial_num, portduino_config.lora_usb_vid,
-                                        portduino_config.lora_usb_pid);
+                ch341Hal = std::make_unique<Ch341Hal>(0, portduino_config.lora_usb_serial_num, portduino_config.lora_usb_vid,
+                                                      portduino_config.lora_usb_pid);
             } catch (std::exception &e) {
                 std::cerr << e.what() << std::endl;
                 std::cerr << "Could not initialize CH341 device!" << std::endl;

src/mesh/RadioInterface.cpp

@@ -414,7 +414,7 @@ std::unique_ptr<RadioInterface> initLoRa()
     LOG_DEBUG("Activate %s radio on SPI port %s", portduino_config.loraModules[portduino_config.lora_module].c_str(),
               portduino_config.lora_spi_dev.c_str());
     if (portduino_config.lora_spi_dev == "ch341") {
-        RadioLibHAL = ch341Hal;
+        RadioLibHAL = ch341Hal.get(); // non-owning: the ch341 HAL stays owned by the global unique_ptr
     } else {
         if (RadioLibHAL != nullptr) {
             delete RadioLibHAL;

src/mesh/api/WiFiServerAPI.cpp

@@ -4,23 +4,20 @@
 #if HAS_WIFI
 #include "WiFiServerAPI.h"
 
-static WiFiServerPort *apiPort;
+static std::unique_ptr<WiFiServerPort> apiPort;
 
 void initApiServer(int port)
 {
     // Start API server on port 4403
     if (!apiPort) {
-        apiPort = new WiFiServerPort(port);
+        apiPort = std::make_unique<WiFiServerPort>(port);
         LOG_INFO("API server listen on TCP port %d", port);
         apiPort->init();
     }
 }
 void deInitApiServer()
 {
-    if (apiPort) {
-        delete apiPort;
-        apiPort = nullptr;
-    }
+    apiPort.reset();
 }
 
 WiFiServerAPI::WiFiServerAPI(WiFiClient &_client) : ServerAPI(_client)

src/mesh/api/ethServerAPI.cpp

@@ -5,13 +5,13 @@
 
 #include "ethServerAPI.h"
 
-static ethServerPort *apiPort;
+static std::unique_ptr<ethServerPort> apiPort;
 
 void initApiServer(int port)
 {
     // Start API server on port 4403
     if (!apiPort) {
-        apiPort = new ethServerPort(port);
+        apiPort = std::make_unique<ethServerPort>(port);
         LOG_INFO("API server listening on TCP port %d", port);
         apiPort->init();
     }
@@ -21,8 +21,7 @@ void deInitApiServer()
 {
     if (apiPort) {
         LOG_INFO("Deinit API server");
-        delete apiPort;
-        apiPort = nullptr;
+        apiPort.reset();
     }
 }
 

src/mesh/eth/ethApiServer.cpp

@@ -6,6 +6,7 @@
 #include "ethApiHandlers.h"
 #include "ethApiServer.h"
 #include <Arduino.h>
+#include <memory>
 
 #ifdef USE_ARDUINO_ETHERNET
 #include <Ethernet.h>
@@ -20,7 +21,7 @@ static constexpr int32_t ACTIVE_INTERVAL_MS = 20;
 static constexpr int32_t MEDIUM_INTERVAL_MS = 100;
 static constexpr int32_t IDLE_INTERVAL_MS = 500;
 
-static EthernetServer *apiServer = nullptr;
+static std::unique_ptr<EthernetServer> apiServer;
 
 // Adapter that exposes an EthernetClient through the transport-agnostic
 // IStreamReadWrite interface so the handlers in ethApiHandlers.cpp can drive
@@ -86,7 +87,7 @@ void initEthApiServer()
     // Bind the listener (idempotent - deInitEthApiServer() drops apiServer on a
     // W5500 reset, and this rebinds it on the restart path).
     if (!apiServer) {
-        apiServer = new EthernetServer(ETH_API_PORT);
+        apiServer = std::make_unique<EthernetServer>(ETH_API_PORT);
         apiServer->begin();
         LOG_INFO("ETH API: server listening on TCP port %d (phase 2.0, OSThread @ 20ms)", ETH_API_PORT);
     }
@@ -103,10 +104,7 @@ void deInitEthApiServer()
     // A W5500 chip reset wipes the hardware socket table, so the listener is now
     // bound to a dead socket. Drop it (the worker stays alive and idles) so the
     // next initEthApiServer() from reconnectETH's restart path rebinds TCP/80.
-    if (apiServer) {
-        delete apiServer;
-        apiServer = nullptr;
-    }
+    apiServer.reset();
 }
 
 #endif // HAS_ETHERNET && HAS_ETHERNET_API

src/mesh/http/ContentHandler.cpp

@@ -6,6 +6,7 @@
 #include "main.h"
 #include "mesh/http/ContentHelper.h"
 #include "mesh/http/WebServer.h"
+#include <memory>
 #if HAS_WIFI
 #include "mesh/wifi/WiFiAPClient.h"
 #endif
@@ -484,7 +485,7 @@ void handleFormUpload(HTTPRequest *req, HTTPResponse *res)
     // Actually we do this only for documentary purposes, we know the form is going
     // to be multipart/form-data.
     LOG_DEBUG("Form Upload - Creating body parser reference");
-    HTTPBodyParser *parser;
+    std::unique_ptr<HTTPBodyParser> parser;
     std::string contentType = req->getHeader("Content-Type");
 
     // The content type may have additional properties after a semicolon, for example:
@@ -500,7 +501,7 @@ void handleFormUpload(HTTPRequest *req, HTTPResponse *res)
     // Now, we can decide based on the content type:
     if (contentType == "multipart/form-data") {
         LOG_DEBUG("Form Upload - multipart/form-data");
-        parser = new HTTPMultipartBodyParser(req);
+        parser.reset(new HTTPMultipartBodyParser(req));
     } else {
         LOG_DEBUG("Unknown POST Content-Type: %s", contentType.c_str());
         return;
@@ -536,7 +537,6 @@ void handleFormUpload(HTTPRequest *req, HTTPResponse *res)
         if (name != "file") {
             LOG_DEBUG("Skip unexpected field");
             res->println("<p>No file found.</p>");
-            delete parser;
             return;
         }
 
@@ -544,7 +544,6 @@ void handleFormUpload(HTTPRequest *req, HTTPResponse *res)
         if (filename == "") {
             LOG_DEBUG("Skip unexpected field");
             res->println("<p>No file found.</p>");
-            delete parser;
             return;
         }
 
@@ -575,7 +574,6 @@ void handleFormUpload(HTTPRequest *req, HTTPResponse *res)
 
                 // enableLoopWDT();
 
-                delete parser;
                 return;
             }
 
@@ -596,7 +594,6 @@ void handleFormUpload(HTTPRequest *req, HTTPResponse *res)
         res->println("<p>Did not write any file</p>");
     }
     res->println("</body></html>");
-    delete parser;
 }
 
 void handleReport(HTTPRequest *req, HTTPResponse *res)

src/platform/portduino/PortduinoGlue.cpp

@@ -62,7 +62,7 @@ portduino_config_struct portduino_config;
 portduino_status_struct portduino_status;
 std::ofstream traceFile;
 std::ofstream JSONFile;
-Ch341Hal *ch341Hal = nullptr;
+std::unique_ptr<Ch341Hal> ch341Hal;
 char *configPath = nullptr;
 char *optionMac = nullptr;
 bool verboseEnabled = false;
@@ -325,8 +325,8 @@ void portduinoSetup()
     {
         extern void wasm_config_apply();
         wasm_config_apply();
-        ch341Hal =
-            new Ch341Hal(0, portduino_config.lora_usb_serial_num, portduino_config.lora_usb_vid, portduino_config.lora_usb_pid);
+        ch341Hal = std::make_unique<Ch341Hal>(0, portduino_config.lora_usb_serial_num, portduino_config.lora_usb_vid,
+                                              portduino_config.lora_usb_pid);
     }
     return;
 #endif
@@ -650,8 +650,8 @@ void portduinoSetup()
     uint8_t dmac[6] = {0};
     if (portduino_config.lora_spi_dev == "ch341") {
         try {
-            ch341Hal = new Ch341Hal(0, portduino_config.lora_usb_serial_num, portduino_config.lora_usb_vid,
-                                    portduino_config.lora_usb_pid);
+            ch341Hal = std::make_unique<Ch341Hal>(0, portduino_config.lora_usb_serial_num, portduino_config.lora_usb_vid,
+                                                  portduino_config.lora_usb_pid);
         } catch (std::exception &e) {
             std::cerr << e.what() << std::endl;
             std::cerr << "Could not initialize CH341 device!" << std::endl;

src/platform/portduino/PortduinoGlue.h

@@ -1,6 +1,7 @@
 #pragma once
 #include <fstream>
 #include <map>
+#include <memory>
 #include <unistd.h>
 #include <unordered_map>
 #include <vector>
@@ -64,7 +65,7 @@ struct pinMapping {
 extern std::ofstream traceFile;
 extern std::ofstream JSONFile;
 
-extern Ch341Hal *ch341Hal;
+extern std::unique_ptr<Ch341Hal> ch341Hal;
 int initGPIOPin(int pinNum, const std::string &gpioChipname, int line);
 bool loadConfig(const char *configPath);
 static bool ends_with(std::string_view str, std::string_view suffix);