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From the FreeRTOS documentation, pdFREERTOS_ERRNO_ENOSPC means that timeout occurred before any data could be sent or received. - In the plaintext transport-interface implementation, we would directly return `-pdFREERTOS_ERRNO_ENOSPC`. However, an error like this can occur when the TCP buffer is full, so this ought to be retriable. Libraries that consume the transport interface interpret a return value of 0 to mean that send/recv can be invoked again to get the data. As such, we should appropriately set the return value as 0 when the status is `-pdFREERTOS_ERRNO_ENOSPC`. - In the mbedTLS port, we would directly return whatever `FreeRTOS_send` or `FreeRTOS_recv` returns. However, sometimes, the return value can be an error. In such cases, we ought to map an error from FreeRTOS+TCP to an equivalent error in mbedTLS. In the case of `-pdFREERTOS_ERRNO_ENOSPC`, we map that to `MBEDTLS_ERR_SSL_TIMEOUT`. When the mbedTLS transport-interface send/recv wrapper sees that value, it appropriately returns 0, so that the library can retry the send/recv. I've verified that when the mbedTLS port returns an error, that same error is returned by `mbedtls_ssl_write` & `mbedtls_ssl_read`. - The TCP socket may have a receive block time. If bytesToRecv is greater than 1 then a frame is likely already part way through reception and blocking to wait for the desired number of bytes to be available is the most efficient thing to do. If bytesToRecv is 1 then this may be a speculative call to read to find the start of a new frame, in which case blocking is not desirable as it could block an entire protocol agent task for the duration of the read block time and therefore negatively impact performance. So if bytesToRecv is 1 then don't call recv unless it is known that bytes are already available. Co-authored-by: abhidixi11 <44424462+abhidixi11@users.noreply.github.com> Co-authored-by: RichardBarry <3073890+RichardBarry@users.noreply.github.com>
68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/*
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* FreeRTOS V202011.00
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* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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*
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*/
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/**
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* @file mbedtls_error.h
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* @brief Stringification utilities for high-level and low-level codes of mbed TLS.
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*/
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#ifndef MBEDTLS_ERROR_H_
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#define MBEDTLS_ERROR_H_
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Translate an mbed TLS high level code into its string representation.
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* Result includes a terminating null byte.
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*
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* @param errnum The error code containing the high-level code.
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* @return The string representation if high-level code is present; otherwise NULL.
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*
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* @warning The string returned by this function must never be modified.
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*/
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const char * mbedtls_strerror_highlevel( int32_t errnum );
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/**
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* @brief Translate an mbed TLS low level code into its string representation,
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* Result includes a terminating null byte.
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*
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* @param errnum The error code containing the low-level code.
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* @return The string representation if low-level code is present; otherwise NULL.
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*
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* @warning The string returned by this function must never be modified.
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*/
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const char * mbedtls_strerror_lowlevel( int32_t errnum );
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#ifdef __cplusplus
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}
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#endif
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#endif /* ifndef MBEDTLS_ERROR_H_ */
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