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Add mbedtls_ssl_get_max_frag_len()

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This is not very useful for TLS as mbedtls_ssl_write() will automatically
fragment and return the length used, and the application should check for that
anyway, but this is useful for DTLS where mbedtls_ssl_write() returns an
error, and the application needs to be able to query the maximum length
instead of just guessing.
This commit is contained in:
Manuel Pégourié-Gonnard
2015-08-31 18:30:52 +02:00
parent 7b23c51595
commit a2cda6bfaf
6 changed files with 69 additions and 17 deletions
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41
library/ssl_tls.c
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@ -5862,6 +5862,29 @@ int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
}
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
{
size_t max_len;
/*
* Assume mfl_code is correct since it was checked when set
*/
max_len = mfl_code_to_length[ssl->conf->mfl_code];
/*
* Check if a smaller max length was negotiated
*/
if( ssl->session_out != NULL &&
mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
{
max_len = mfl_code_to_length[ssl->session_out->mfl_code];
}
return max_len;
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
{
@ -6339,23 +6362,7 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
{
int ret;
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
unsigned int max_len;
#endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
/*
* Assume mfl_code is correct since it was checked when set
*/
max_len = mfl_code_to_length[ssl->conf->mfl_code];
/*
* Check if a smaller max length was negotiated
*/
if( ssl->session_out != NULL &&
mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
{
max_len = mfl_code_to_length[ssl->session_out->mfl_code];
}
size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
if( len > max_len )
{