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ssl_tls13_client.c: alpn: Miscellanous minor improvements

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2022-03-09 13:56:48 +01:00
parent 13d8ea1dd9
commit 60ff79424e
1 changed files with 16 additions and 14 deletions
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26
library/ssl_tls13_client.c
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@ -113,7 +113,10 @@ static int ssl_tls13_parse_supported_versions_ext( mbedtls_ssl_context *ssl,
#if defined(MBEDTLS_SSL_ALPN)
/*
* ssl_tls13_write_alpn_ext( ) structure:
* ssl_tls13_write_alpn_ext()
*
* Structure of the application_layer_protocol_negotiation extension in
* ClientHello:
*
* opaque ProtocolName<1..2^8-1>;
*
@ -125,13 +128,11 @@ static int ssl_tls13_parse_supported_versions_ext( mbedtls_ssl_context *ssl,
static int ssl_tls13_write_alpn_ext( mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen )
size_t *out_len )
{
unsigned char *p = buf;
size_t protocol_name_len;
const char **cur;
*olen = 0;
*out_len = 0;
if( ssl->conf->alpn_list == NULL )
return( 0 );
@ -154,26 +155,27 @@ static int ssl_tls13_write_alpn_ext( mbedtls_ssl_context *ssl,
* ProtocolName protocol_name_list<2..2^16-1>
* } ProtocolNameList;
*/
for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
for( const char **cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
{
/*
* mbedtls_ssl_conf_set_alpn_protocols() checked that the length of
* protocol names is less than 255.
*/
protocol_name_len = strlen( *cur );
size_t protocol_name_len = strlen( *cur );
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 + protocol_name_len );
*p++ = (unsigned char)protocol_name_len;
memcpy( p, *cur, protocol_name_len );
p += protocol_name_len;
}
*olen = p - buf;
*out_len = p - buf;
/* List length = olen - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */
MBEDTLS_PUT_UINT16_BE( *olen - 6, buf, 4 );
/* List length = *out_len - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */
MBEDTLS_PUT_UINT16_BE( *out_len - 6, buf, 4 );
/* Extension length = olen - 2 (ext_type) - 2 (ext_len) */
MBEDTLS_PUT_UINT16_BE( *olen - 4, buf, 2 );
/* Extension length = *out_len - 2 (ext_type) - 2 (ext_len) */
MBEDTLS_PUT_UINT16_BE( *out_len - 4, buf, 2 );
return( 0 );
}