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Clarify documentation of mbedtls_ssl_context_load()

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Manuel Pégourié-Gonnard 2019-06-11 11:25:10 +02:00 committed by Jarno Lamsa
parent 6d8f128790
commit d0a86f96dc
1 changed files with 28 additions and 9 deletions
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37
include/mbedtls/ssl.h
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@ -3939,23 +3939,42 @@ int mbedtls_ssl_context_save( mbedtls_ssl_context *ssl,
* including but not limited to loss of confidentiality.
*
* \note Before calling this function, the SSL context must be
* prepared either by calling mbedtls_ssl_setup() on it with
* prepared in one of the two following ways. The first way is
* to take a context freshly initialised with
* mbedtls_ssl_init() and call mbedtls_ssl_setup() on it with
* the same ::mbedtls_ssl_config structure that was used in
* the original connection, and not using it with any other
* function between mbedtls_ssl_setup() and this one, or by
* calling mbedtls_ssl_session_reset() on a context that was
* the original connection. The second way is to
* call mbedtls_ssl_session_reset() on a context that was
* previously prepared as above but used in the meantime.
* Either way, you must not use the context to perform a
* handshake between calling mbedtls_ssl_setup() or
* mbedtls_ssl_session_reset() and calling this function. You
* may however call other setter functions in that time frame
* as indicated in the note below.
*
* \note Before or after calling this function successfully, you
* also need to configure some connection-specific callback
* also need to configure some connection-specific callbacks
* and settings before you can use the connection again
* (unless they were already set before calling
* mbedtls_ssl_session_reset() and the values are suitable for
* the present connection). Specifically, you want to call
* at least mbedtls_ssl_set_bio() and possibly
* mbedtls_ssl_set_timer_cb(). You might also want to call
* mbedtls_ssl_set_mtu() if new information about the PMTU is
* available - otherwise the saved information will be used.
* at least mbedtls_ssl_set_bio(). If you're using a read
* timeout (that is, you called
* mbedtls_ssl_conf_read_timeout() with a non-zero timeout)
* and non-blocking I/O, you also need to set timer callbacks
* by calling mbedtls_ssl_set_timer_cb(). All other SSL setter
* functions are not necessary to call, either because they're
* only used in handshakes, or because the setting is already
* saved. You might choose to call them anyway, for example in
* order to share code between the cases of establishing a new
* connection and the case of loading an already-established
* connection.
*
* \note If you have new information about the path MTU, you want to
* call mbedtls_ssl_set_mtu() after calling this function, as
* otherwise this function would overwrite your
* newly-configured value with the value that was active when
* the context was saved.
*
* \param ssl The SSL context structure to be populated. It must have
* been prepared as described in the note above.