Fix API socket issues (#2288)

* Fix API socket issues

* Fix compile error against beta

* Format

esphome/components/api/api_connection.cpp

@@ -36,19 +36,14 @@ void APIConnection::start() {
 
   APIError err = helper_->init();
   if (err != APIError::OK) {
-    ESP_LOGW(TAG, "Helper init failed: %d errno=%d", (int) err, errno);
+    on_fatal_error();
-    remove_ = true;
+    ESP_LOGW(TAG, "%s: Helper init failed: %s errno=%d", client_info_.c_str(), api_error_to_str(err), errno);
     return;
   }
   client_info_ = helper_->getpeername();
   helper_->set_log_info(client_info_);
 }
 
-void APIConnection::force_disconnect_client() {
-  this->helper_->close();
-  this->remove_ = true;
-}
-
 void APIConnection::loop() {
   if (this->remove_)
     return;
@@ -57,9 +52,11 @@ void APIConnection::loop() {
     // when network is disconnected force disconnect immediately
     // don't wait for timeout
     this->on_fatal_error();
+    ESP_LOGW(TAG, "%s: Network unavailable, disconnecting", client_info_.c_str());
     return;
   }
   if (this->next_close_) {
+    // requested a disconnect
     this->helper_->close();
     this->remove_ = true;
     return;
@@ -68,7 +65,7 @@ void APIConnection::loop() {
   APIError err = helper_->loop();
   if (err != APIError::OK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Socket operation failed: %d", client_info_.c_str(), (int) err);
+    ESP_LOGW(TAG, "%s: Socket operation failed: %s errno=%d", client_info_.c_str(), api_error_to_str(err), errno);
     return;
   }
   ReadPacketBuffer buffer;
@@ -77,7 +74,11 @@ void APIConnection::loop() {
     // pass
   } else if (err != APIError::OK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Reading failed: %d", client_info_.c_str(), (int) err);
+    if (err == APIError::SOCKET_READ_FAILED && errno == ECONNRESET) {
+      ESP_LOGW(TAG, "%s: Connection reset", client_info_.c_str());
+    } else {
+      ESP_LOGW(TAG, "%s: Reading failed: %s errno=%d", client_info_.c_str(), api_error_to_str(err), errno);
+    }
     return;
   } else {
     this->last_traffic_ = millis();
@@ -95,8 +96,8 @@ void APIConnection::loop() {
   if (this->sent_ping_) {
     // Disconnect if not responded within 2.5*keepalive
     if (now - this->last_traffic_ > (keepalive * 5) / 2) {
-      this->force_disconnect_client();
+      on_fatal_error();
-      ESP_LOGW(TAG, "'%s' didn't respond to ping request in time. Disconnecting...", this->client_info_.c_str());
+      ESP_LOGW(TAG, "%s didn't respond to ping request in time. Disconnecting...", this->client_info_.c_str());
     }
   } else if (now - this->last_traffic_ > keepalive) {
     this->sent_ping_ = true;
@@ -124,12 +125,40 @@ void APIConnection::loop() {
     }
   }
 #endif
+
+  if (state_subs_at_ != -1) {
+    const auto &subs = this->parent_->get_state_subs();
+    if (state_subs_at_ >= subs.size()) {
+      state_subs_at_ = -1;
+    } else {
+      auto &it = subs[state_subs_at_];
+      SubscribeHomeAssistantStateResponse resp;
+      resp.entity_id = it.entity_id;
+      resp.attribute = it.attribute.value();
+      if (this->send_subscribe_home_assistant_state_response(resp)) {
+        state_subs_at_++;
+      }
+    }
+  }
 }
 
 std::string get_default_unique_id(const std::string &component_type, Nameable *nameable) {
   return App.get_name() + component_type + nameable->get_object_id();
 }
 
+DisconnectResponse APIConnection::disconnect(const DisconnectRequest &msg) {
+  // remote initiated disconnect_client
+  // don't close yet, we still need to send the disconnect response
+  // close will happen on next loop
+  ESP_LOGD(TAG, "%s requested disconnected", client_info_.c_str());
+  this->next_close_ = true;
+  DisconnectResponse resp;
+  return resp;
+}
+void APIConnection::on_disconnect_response(const DisconnectResponse &value) {
+  // pass
+}
+
 #ifdef USE_BINARY_SENSOR
 bool APIConnection::send_binary_sensor_state(binary_sensor::BinarySensor *binary_sensor, bool state) {
   if (!this->state_subscription_)
@@ -703,7 +732,7 @@ ConnectResponse APIConnection::connect(const ConnectRequest &msg) {
   // bool invalid_password = 1;
   resp.invalid_password = !correct;
   if (correct) {
-    ESP_LOGD(TAG, "Client '%s' connected successfully!", this->client_info_.c_str());
+    ESP_LOGD(TAG, "%s: Connected successfully", this->client_info_.c_str());
     this->connection_state_ = ConnectionState::AUTHENTICATED;
 
 #ifdef USE_HOMEASSISTANT_TIME
@@ -749,15 +778,7 @@ void APIConnection::execute_service(const ExecuteServiceRequest &msg) {
   }
 }
 void APIConnection::subscribe_home_assistant_states(const SubscribeHomeAssistantStatesRequest &msg) {
-  for (auto &it : this->parent_->get_state_subs()) {
+  state_subs_at_ = 0;
-    SubscribeHomeAssistantStateResponse resp;
-    resp.entity_id = it.entity_id;
-    resp.attribute = it.attribute.value();
-    if (!this->send_subscribe_home_assistant_state_response(resp)) {
-      this->on_fatal_error();
-      return;
-    }
-  }
 }
 bool APIConnection::send_buffer(ProtoWriteBuffer buffer, uint32_t message_type) {
   if (this->remove_)
@@ -770,7 +791,11 @@ bool APIConnection::send_buffer(ProtoWriteBuffer buffer, uint32_t message_type)
     return false;
   if (err != APIError::OK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Packet write failed %d errno=%d", client_info_.c_str(), (int) err, errno);
+    if (err == APIError::SOCKET_WRITE_FAILED && errno == ECONNRESET) {
+      ESP_LOGW(TAG, "%s: Connection reset", client_info_.c_str());
+    } else {
+      ESP_LOGW(TAG, "%s: Packet write failed %s errno=%d", client_info_.c_str(), api_error_to_str(err), errno);
+    }
     return false;
   }
   this->last_traffic_ = millis();
@@ -778,14 +803,13 @@ bool APIConnection::send_buffer(ProtoWriteBuffer buffer, uint32_t message_type)
 }
 void APIConnection::on_unauthenticated_access() {
   this->on_fatal_error();
-  ESP_LOGD(TAG, "'%s' tried to access without authentication.", this->client_info_.c_str());
+  ESP_LOGD(TAG, "%s: tried to access without authentication.", this->client_info_.c_str());
 }
 void APIConnection::on_no_setup_connection() {
   this->on_fatal_error();
-  ESP_LOGD(TAG, "'%s' tried to access without full connection.", this->client_info_.c_str());
+  ESP_LOGD(TAG, "%s: tried to access without full connection.", this->client_info_.c_str());
 }
 void APIConnection::on_fatal_error() {
-  ESP_LOGV(TAG, "Error: Disconnecting %s", this->client_info_.c_str());
   this->helper_->close();
   this->remove_ = true;
 }

esphome/components/api/api_connection.h

@@ -16,7 +16,6 @@ class APIConnection : public APIServerConnection {
   virtual ~APIConnection() = default;
 
   void start();
-  void force_disconnect_client();
   void loop();
 
   bool send_list_info_done() {
@@ -88,10 +87,7 @@ class APIConnection : public APIServerConnection {
   }
 #endif
 
-  void on_disconnect_response(const DisconnectResponse &value) override {
+  void on_disconnect_response(const DisconnectResponse &value) override;
-    this->helper_->close();
-    this->remove_ = true;
-  }
   void on_ping_response(const PingResponse &value) override {
     // we initiated ping
     this->sent_ping_ = false;
@@ -102,14 +98,7 @@ class APIConnection : public APIServerConnection {
 #endif
   HelloResponse hello(const HelloRequest &msg) override;
   ConnectResponse connect(const ConnectRequest &msg) override;
-  DisconnectResponse disconnect(const DisconnectRequest &msg) override {
+  DisconnectResponse disconnect(const DisconnectRequest &msg) override;
-    // remote initiated disconnect_client
-    // don't close yet, we still need to send the disconnect response
-    // close will happen on next loop
-    this->next_close_ = true;
-    DisconnectResponse resp;
-    return resp;
-  }
   PingResponse ping(const PingRequest &msg) override { return {}; }
   DeviceInfoResponse device_info(const DeviceInfoRequest &msg) override;
   void list_entities(const ListEntitiesRequest &msg) override { this->list_entities_iterator_.begin(); }
@@ -177,6 +166,7 @@ class APIConnection : public APIServerConnection {
   APIServer *parent_;
   InitialStateIterator initial_state_iterator_;
   ListEntitiesIterator list_entities_iterator_;
+  int state_subs_at_ = -1;
 };
 
 }  // namespace api

esphome/components/api/api_frame_helper.cpp

@@ -17,6 +17,54 @@ bool is_would_block(ssize_t ret) {
   return ret == 0;
 }
 
+const char *api_error_to_str(APIError err) {
+  // not using switch to ensure compiler doesn't try to build a big table out of it
+  if (err == APIError::OK) {
+    return "OK";
+  } else if (err == APIError::WOULD_BLOCK) {
+    return "WOULD_BLOCK";
+  } else if (err == APIError::BAD_HANDSHAKE_PACKET_LEN) {
+    return "BAD_HANDSHAKE_PACKET_LEN";
+  } else if (err == APIError::BAD_INDICATOR) {
+    return "BAD_INDICATOR";
+  } else if (err == APIError::BAD_DATA_PACKET) {
+    return "BAD_DATA_PACKET";
+  } else if (err == APIError::TCP_NODELAY_FAILED) {
+    return "TCP_NODELAY_FAILED";
+  } else if (err == APIError::TCP_NONBLOCKING_FAILED) {
+    return "TCP_NONBLOCKING_FAILED";
+  } else if (err == APIError::CLOSE_FAILED) {
+    return "CLOSE_FAILED";
+  } else if (err == APIError::SHUTDOWN_FAILED) {
+    return "SHUTDOWN_FAILED";
+  } else if (err == APIError::BAD_STATE) {
+    return "BAD_STATE";
+  } else if (err == APIError::BAD_ARG) {
+    return "BAD_ARG";
+  } else if (err == APIError::SOCKET_READ_FAILED) {
+    return "SOCKET_READ_FAILED";
+  } else if (err == APIError::SOCKET_WRITE_FAILED) {
+    return "SOCKET_WRITE_FAILED";
+  } else if (err == APIError::HANDSHAKESTATE_READ_FAILED) {
+    return "HANDSHAKESTATE_READ_FAILED";
+  } else if (err == APIError::HANDSHAKESTATE_WRITE_FAILED) {
+    return "HANDSHAKESTATE_WRITE_FAILED";
+  } else if (err == APIError::HANDSHAKESTATE_BAD_STATE) {
+    return "HANDSHAKESTATE_BAD_STATE";
+  } else if (err == APIError::CIPHERSTATE_DECRYPT_FAILED) {
+    return "CIPHERSTATE_DECRYPT_FAILED";
+  } else if (err == APIError::CIPHERSTATE_ENCRYPT_FAILED) {
+    return "CIPHERSTATE_ENCRYPT_FAILED";
+  } else if (err == APIError::OUT_OF_MEMORY) {
+    return "OUT_OF_MEMORY";
+  } else if (err == APIError::HANDSHAKESTATE_SETUP_FAILED) {
+    return "HANDSHAKESTATE_SETUP_FAILED";
+  } else if (err == APIError::HANDSHAKESTATE_SPLIT_FAILED) {
+    return "HANDSHAKESTATE_SPLIT_FAILED";
+  }
+  return "UNKNOWN";
+}
+
 #define HELPER_LOG(msg, ...) ESP_LOGVV(TAG, "%s: " msg, info_.c_str(), ##__VA_ARGS__)
 
 #ifdef USE_API_NOISE
@@ -808,14 +856,12 @@ APIError APIPlaintextFrameHelper::try_send_tx_buf_() {
   // try send from tx_buf
   while (state_ != State::CLOSED && !tx_buf_.empty()) {
     ssize_t sent = socket_->write(tx_buf_.data(), tx_buf_.size());
-    if (sent == -1) {
+    if (is_would_block(sent)) {
-      if (errno == EWOULDBLOCK || errno == EAGAIN)
       break;
+    } else if (sent == -1) {
       state_ = State::FAILED;
       HELPER_LOG("Socket write failed with errno %d", errno);
       return APIError::SOCKET_WRITE_FAILED;
-    } else if (sent == 0) {
-      break;
     }
     // TODO: inefficient if multiple packets in txbuf
     // replace with deque of buffers
@@ -869,20 +915,6 @@ APIError APIPlaintextFrameHelper::write_raw_(const uint8_t *data, size_t len) {
   // fully sent
   return APIError::OK;
 }
-APIError APIPlaintextFrameHelper::write_frame_(const uint8_t *data, size_t len) {
-  APIError aerr;
-
-  uint8_t header[3];
-  header[0] = 0x01;  // indicator
-  header[1] = (uint8_t)(len >> 8);
-  header[2] = (uint8_t) len;
-
-  aerr = write_raw_(header, 3);
-  if (aerr != APIError::OK)
-    return aerr;
-  aerr = write_raw_(data, len);
-  return aerr;
-}
 
 APIError APIPlaintextFrameHelper::close() {
   state_ = State::CLOSED;

esphome/components/api/api_frame_helper.h

@@ -53,6 +53,8 @@ enum class APIError : int {
   HANDSHAKESTATE_SPLIT_FAILED = 1020,
 };
 
+const char *api_error_to_str(APIError err);
+
 class APIFrameHelper {
  public:
   virtual APIError init() = 0;
@@ -150,7 +152,6 @@ class APIPlaintextFrameHelper : public APIFrameHelper {
 
   APIError try_read_frame_(ParsedFrame *frame);
   APIError try_send_tx_buf_();
-  APIError write_frame_(const uint8_t *data, size_t len);
   APIError write_raw_(const uint8_t *data, size_t len);
 
   std::unique_ptr<socket::Socket> socket_;

esphome/components/api/api_server.cpp

@@ -105,7 +105,7 @@ void APIServer::loop() {
                                 [](const std::unique_ptr<APIConnection> &conn) { return !conn->remove_; });
   // print disconnection messages
   for (auto it = new_end; it != this->clients_.end(); ++it) {
-    ESP_LOGD(TAG, "Disconnecting %s", (*it)->client_info_.c_str());
+    ESP_LOGV(TAG, "Removing connection to %s", (*it)->client_info_.c_str());
   }
   // resize vector
   this->clients_.erase(new_end, this->clients_.end());

esphome/components/socket/lwip_raw_tcp_impl.cpp

@@ -109,14 +109,17 @@ class LWIPRawImpl : public Socket {
     LWIP_LOG("tcp_bind(%p ip=%u port=%u)", pcb_, ip.addr, port);
     err_t err = tcp_bind(pcb_, &ip, port);
     if (err == ERR_USE) {
+      LWIP_LOG("  -> err ERR_USE");
       errno = EADDRINUSE;
       return -1;
     }
     if (err == ERR_VAL) {
+      LWIP_LOG("  -> err ERR_VAL");
       errno = EINVAL;
       return -1;
     }
     if (err != ERR_OK) {
+      LWIP_LOG("  -> err %d", err);
       errno = EIO;
       return -1;
     }
@@ -124,12 +127,13 @@ class LWIPRawImpl : public Socket {
   }
   int close() override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     LWIP_LOG("tcp_close(%p)", pcb_);
     err_t err = tcp_close(pcb_);
     if (err != ERR_OK) {
+      LWIP_LOG("  -> err %d", err);
       tcp_abort(pcb_);
       pcb_ = nullptr;
       errno = err == ERR_MEM ? ENOMEM : EIO;
@@ -140,7 +144,7 @@ class LWIPRawImpl : public Socket {
   }
   int shutdown(int how) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     bool shut_rx = false, shut_tx = false;
@@ -157,6 +161,7 @@ class LWIPRawImpl : public Socket {
     LWIP_LOG("tcp_shutdown(%p shut_rx=%d shut_tx=%d)", pcb_, shut_rx ? 1 : 0, shut_tx ? 1 : 0);
     err_t err = tcp_shutdown(pcb_, shut_rx, shut_tx);
     if (err != ERR_OK) {
+      LWIP_LOG("  -> err %d", err);
       errno = err == ERR_MEM ? ENOMEM : EIO;
       return -1;
     }
@@ -165,7 +170,7 @@ class LWIPRawImpl : public Socket {
 
   int getpeername(struct sockaddr *name, socklen_t *addrlen) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     if (name == nullptr || addrlen == nullptr) {
@@ -185,7 +190,7 @@ class LWIPRawImpl : public Socket {
   }
   std::string getpeername() override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return "";
     }
     char buffer[24];
@@ -196,7 +201,7 @@ class LWIPRawImpl : public Socket {
   }
   int getsockname(struct sockaddr *name, socklen_t *addrlen) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     if (name == nullptr || addrlen == nullptr) {
@@ -216,7 +221,7 @@ class LWIPRawImpl : public Socket {
   }
   std::string getsockname() override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return "";
     }
     char buffer[24];
@@ -227,7 +232,7 @@ class LWIPRawImpl : public Socket {
   }
   int getsockopt(int level, int optname, void *optval, socklen_t *optlen) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     if (optlen == nullptr || optval == nullptr) {
@@ -261,7 +266,7 @@ class LWIPRawImpl : public Socket {
   }
   int setsockopt(int level, int optname, const void *optval, socklen_t optlen) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     if (level == SOL_SOCKET && optname == SO_REUSEADDR) {
@@ -314,7 +319,7 @@ class LWIPRawImpl : public Socket {
   }
   ssize_t read(void *buf, size_t len) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     if (rx_closed_ && rx_buf_ == nullptr) {
@@ -368,7 +373,7 @@ class LWIPRawImpl : public Socket {
   }
   ssize_t write(const void *buf, size_t len) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     if (len == 0)
@@ -386,24 +391,37 @@ class LWIPRawImpl : public Socket {
     LWIP_LOG("tcp_write(%p buf=%p %u)", pcb_, buf, to_send);
     err_t err = tcp_write(pcb_, buf, to_send, TCP_WRITE_FLAG_COPY);
     if (err == ERR_MEM) {
+      LWIP_LOG("  -> err ERR_MEM");
       errno = EWOULDBLOCK;
       return -1;
     }
     if (err != ERR_OK) {
-      errno = EIO;
+      LWIP_LOG("  -> err %d", err);
+      errno = ECONNRESET;
       return -1;
     }
+    if (tcp_nagle_disabled(pcb_)) {
       LWIP_LOG("tcp_output(%p)", pcb_);
       err = tcp_output(pcb_);
+      if (err == ERR_ABRT) {
+        LWIP_LOG("  -> err ERR_ABRT");
+        // sometimes lwip returns ERR_ABRT for no apparent reason
+        // the connection works fine afterwards, and back with ESPAsyncTCP we
+        // indirectly also ignored this error
+        // FIXME: figure out where this is returned and what it means in this context
+        return to_send;
+      }
       if (err != ERR_OK) {
-      errno = EIO;
+        LWIP_LOG("  -> err %d", err);
+        errno = ECONNRESET;
         return -1;
       }
+    }
     return to_send;
   }
   int setblocking(bool blocking) override {
     if (pcb_ == nullptr) {
-      errno = EBADF;
+      errno = ECONNRESET;
       return -1;
     }
     if (blocking) {
@@ -466,7 +484,7 @@ class LWIPRawImpl : public Socket {
 
   static void s_err_fn(void *arg, err_t err) {
     LWIPRawImpl *arg_this = reinterpret_cast<LWIPRawImpl *>(arg);
-    return arg_this->err_fn(err);
+    arg_this->err_fn(err);
   }
 
   static err_t s_recv_fn(void *arg, struct tcp_pcb *pcb, struct pbuf *pb, err_t err) {