227 lines
8.8 KiB
C
227 lines
8.8 KiB
C
// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <protocomm_security.h>
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#include <esp_err.h>
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/**
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* @brief Function prototype for protocomm endpoint handler
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*/
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typedef esp_err_t (*protocomm_req_handler_t)(
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uint32_t session_id, /*!< Session ID for identifying protocomm client */
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const uint8_t *inbuf, /*!< Pointer to user provided input data buffer */
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ssize_t inlen, /*!< Length o the input buffer */
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uint8_t **outbuf, /*!< Pointer to output buffer allocated by handler */
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ssize_t *outlen, /*!< Length of the allocated output buffer */
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void *priv_data /*!< Private data passed to the handler (NULL if not used) */
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);
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/**
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* @brief This structure corresponds to a unique instance of protocomm
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* returned when the API `protocomm_new()` is called. The remaining
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* Protocomm APIs require this object as the first parameter.
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*
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* @note Structure of the protocomm object is kept private
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*/
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typedef struct protocomm protocomm_t;
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/**
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* @brief Create a new protocomm instance
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*
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* This API will return a new dynamically allocated protocomm instance
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* with all elements of the protocomm_t structure initialised to NULL.
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*
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* @return
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* - protocomm_t* : On success
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* - NULL : No memory for allocating new instance
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*/
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protocomm_t *protocomm_new();
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/**
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* @brief Delete a protocomm instance
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*
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* This API will deallocate a protocomm instance that was created
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* using `protocomm_new()`.
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*
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* @param[in] pc Pointer to the protocomm instance to be deleted
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*/
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void protocomm_delete(protocomm_t *pc);
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/**
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* @brief Add endpoint request handler for a protocomm instance
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*
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* This API will bind an endpoint handler function to the specified
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* endpoint name, along with any private data that needs to be pass to
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* the handler at the time of call.
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*
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* @note
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* - An endpoint must be bound to a valid protocomm instance,
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* created using `protocomm_new()`.
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* - This function internally calls the registered `add_endpoint()`
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* function which is a member of the protocomm_t instance structure.
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*
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* @param[in] pc Pointer to the protocomm instance
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* @param[in] ep_name Endpoint identifier(name) string
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* @param[in] h Endpoint handler function
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* @param[in] priv_data Pointer to private data to be passed as a
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* parameter to the handler function on call.
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* Pass NULL if not needed.
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*
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* @return
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* - ESP_OK : Added new endpoint succesfully
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* - ESP_FAIL : Error adding endpoint / Endpoint with this name already exists
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* - ESP_ERR_NO_MEM : Error allocating endpoint resource
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* - ESP_ERR_INVALID_ARG : Null instance/name/handler arguments
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*/
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esp_err_t protocomm_add_endpoint(protocomm_t *pc, const char *ep_name,
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protocomm_req_handler_t h, void *priv_data);
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/**
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* @brief Remove endpoint request handler for a protocomm instance
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*
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* This API will remove a registered endpoint handler identified by
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* an endpoint name.
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*
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* @note
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* - This function internally calls the registered `remove_endpoint()`
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* function which is a member of the protocomm_t instance structure.
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*
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* @param[in] pc Pointer to the protocomm instance
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* @param[in] ep_name Endpoint identifier(name) string
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*
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* @return
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* - ESP_OK : Added new endpoint succesfully
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* - ESP_ERR_NOT_FOUND : Endpoint with specified name doesn't exist
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* - ESP_ERR_INVALID_ARG : Null instance/name arguments
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*/
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esp_err_t protocomm_remove_endpoint(protocomm_t *pc, const char *ep_name);
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/**
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* @brief Calls the registered handler of an endpoint session
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* for processing incoming data and giving the output
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*
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* @note
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* - An endpoint must be bound to a valid protocomm instance,
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* created using `protocomm_new()`.
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* - Resulting output buffer must be deallocated by the user.
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*
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* @param[in] pc Pointer to the protocomm instance
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* @param[in] ep_name Endpoint identifier(name) string
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* @param[in] session_id Unique ID for a communication session
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* @param[in] inbuf Input buffer contains input request data which is to be
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* processed by the registered handler
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* @param[in] inlen Length of the input buffer
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* @param[out] outbuf Pointer to internally allocated output buffer,
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* where the resulting response data output from
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* the registered handler is to be stored
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* @param[out] outlen Buffer length of the allocated output buffer
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*
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* @return
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* - ESP_OK : Request handled succesfully
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* - ESP_FAIL : Internal error in execution of registered handler
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* - ESP_ERR_NO_MEM : Error allocating internal resource
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* - ESP_ERR_NOT_FOUND : Endpoint with specified name doesn't exist
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* - ESP_ERR_INVALID_ARG : Null instance/name arguments
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*/
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esp_err_t protocomm_req_handle(protocomm_t *pc, const char *ep_name, uint32_t session_id,
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const uint8_t *inbuf, ssize_t inlen,
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uint8_t **outbuf, ssize_t *outlen);
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/**
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* @brief Add endpoint security for a protocomm instance
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*
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* This API will bind a security session establisher to the specified
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* endpoint name, along with any proof of possession that may be required
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* for authenticating a session client.
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*
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* @note
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* - An endpoint must be bound to a valid protocomm instance,
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* created using `protocomm_new()`.
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* - The choice of security can be any `protocomm_security_t` instance.
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* Choices `protocomm_security0` and `protocomm_security1` are readily available.
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*
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* @param[in] pc Pointer to the protocomm instance
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* @param[in] ep_name Endpoint identifier(name) string
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* @param[in] sec Pointer to endpoint security instance
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* @param[in] pop Pointer to proof of possession for authenticating a client
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*
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* @return
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* - ESP_OK : Added new security endpoint succesfully
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* - ESP_FAIL : Error adding endpoint / Endpoint with this name already exists
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* - ESP_ERR_INVALID_STATE : Security endpoint already set
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* - ESP_ERR_NO_MEM : Error allocating endpoint resource
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* - ESP_ERR_INVALID_ARG : Null instance/name/handler arguments
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*/
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esp_err_t protocomm_set_security(protocomm_t *pc, const char *ep_name,
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const protocomm_security_t *sec,
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const protocomm_security_pop_t *pop);
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/**
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* @brief Remove endpoint security for a protocomm instance
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*
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* This API will remove a registered security endpoint identified by
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* an endpoint name.
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*
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* @param[in] pc Pointer to the protocomm instance
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* @param[in] ep_name Endpoint identifier(name) string
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*
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* @return
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* - ESP_OK : Added new endpoint succesfully
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* - ESP_ERR_NOT_FOUND : Endpoint with specified name doesn't exist
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* - ESP_ERR_INVALID_ARG : Null instance/name arguments
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*/
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esp_err_t protocomm_unset_security(protocomm_t *pc, const char *ep_name);
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/**
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* @brief Set endpoint for version verification
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*
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* This API can be used for setting an application specific protocol
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* version which can be verfied by clients through the endpoint.
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*
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* @note
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* - An endpoint must be bound to a valid protocomm instance,
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* created using `protocomm_new()`.
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* @param[in] pc Pointer to the protocomm instance
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* @param[in] ep_name Endpoint identifier(name) string
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* @param[in] version Version identifier(name) string
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*
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* @return
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* - ESP_OK : Added new security endpoint succesfully
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* - ESP_FAIL : Error adding endpoint / Endpoint with this name already exists
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* - ESP_ERR_INVALID_STATE : Version endpoint already set
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* - ESP_ERR_NO_MEM : Error allocating endpoint resource
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* - ESP_ERR_INVALID_ARG : Null instance/name/handler arguments
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*/
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esp_err_t protocomm_set_version(protocomm_t *pc, const char *ep_name,
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const char *version);
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/**
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* @brief Remove version verification endpoint from a protocomm instance
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*
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* This API will remove a registered version endpoint identified by
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* an endpoint name.
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*
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* @param[in] pc Pointer to the protocomm instance
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* @param[in] ep_name Endpoint identifier(name) string
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*
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* @return
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* - ESP_OK : Added new endpoint succesfully
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* - ESP_ERR_NOT_FOUND : Endpoint with specified name doesn't exist
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* - ESP_ERR_INVALID_ARG : Null instance/name arguments
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*/
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esp_err_t protocomm_unset_version(protocomm_t *pc, const char *ep_name);
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