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Improve interop by not writing ext_len in ClientHello / ServerHello when 0

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The RFC also indicates that without any extensions, we should write a
struct {} (empty) not an array of length zero.
This commit is contained in:
Paul Bakker
2014-04-30 10:15:38 +02:00
parent c73079a78c
commit a70366317d
3 changed files with 14 additions and 6 deletions
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9
library/ssl_cli.c
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@@ -651,9 +651,12 @@ static int ssl_write_client_hello( ssl_context *ssl )
SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
ext_len ) );
*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ext_len ) & 0xFF );
p += ext_len;
if( ext_len > 0 )
{
*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ext_len ) & 0xFF );
p += ext_len;
}
ssl->out_msglen = p - buf;
ssl->out_msgtype = SSL_MSG_HANDSHAKE;