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Read TLS records ahead with OpenSSL 1.1.0 and later

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Read-ahead was off, so OpenSSL read every record in two calls, its
header and then its body. It was off because ssl_poll() asks
ssl_pending(), and SSL_pending() does not count data read ahead and not
yet decrypted: poll() would wait while data waits in OpenSSL.
SSL_has_pending() does count it. With OpenSSL 1.1.0 and later, which
have it, ssl_pending() uses it and records are read ahead; with older
ones and wolfSSL nothing changes.

SSL_has_pending() is also true when only a part of a record has been
read ahead, which is no data yet: poll() would then return at once, over
and over and without its timeout, until the rest came. ssl_pending()
says so only when decrypted data waits, or when what was read ahead
makes a whole record (SSL_peek() of one byte, the sockets not blocking);
otherwise the socket is polled for the rest.

Decrypting TLS streams takes 9-14% less time for the same data (ARM).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Vladimir Dubrovin 2026-10-13 12:21:23 +03:00
parent 4a90c65a6a
commit 4edb94d09e
3 changed files with 30 additions and 3 deletions
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6
src/ssl.c
View File

@ -409,7 +409,7 @@ SSL_CONN dosrvcon(struct clientparam* param, SSL_CERT* cert){
}
SSL_set_mode((SSL *)((ssl_conn *)ServerConn)->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE|SSL_MODE_AUTO_RETRY);
SSL_set_read_ahead((SSL *)((ssl_conn *)ServerConn)->ssl, 0);
SSL_set_read_ahead((SSL *)((ssl_conn *)ServerConn)->ssl, SSL_READAHEAD);
return ServerConn;
}
@ -442,7 +442,7 @@ int domitm(struct clientparam* param){
}
SSL_set_mode((SSL *)((ssl_conn *)ClientConn)->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE|SSL_MODE_AUTO_RETRY);
SSL_set_read_ahead((SSL *)((ssl_conn *)ClientConn)->ssl, 0);
SSL_set_read_ahead((SSL *)((ssl_conn *)ClientConn)->ssl, SSL_READAHEAD);
addSSL(param->clisock, ClientConn, param->remsock, ServerConn, param);
@ -772,7 +772,7 @@ static FILTER_ACTION ssl_filter_client(void *fo, struct clientparam * param, voi
return REJECT;
}
SSL_set_mode((SSL *)((ssl_conn *)ClientConn)->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE|SSL_MODE_AUTO_RETRY);
SSL_set_read_ahead((SSL *)((ssl_conn *)ClientConn)->ssl, 0);
SSL_set_read_ahead((SSL *)((ssl_conn *)ClientConn)->ssl, SSL_READAHEAD);
addSSL(param->clisock, ClientConn, INVALID_SOCKET, NULL, param);
}
return CONTINUE;

10
src/ssl.h
View File

@ -76,6 +76,16 @@ int ssl_read(SSL_CONN connection, void * buf, int bufsize);
int ssl_write(SSL_CONN connection, void * buf, int bufsize);
int ssl_pending(SSL_CONN connection);
/* TLS records are read ahead, a buffer at a time rather than two reads for
each record, where what is read ahead and not yet decrypted shows as
pending (SSL_has_pending(), OpenSSL 1.1.0 and later): poll() would wait
on it otherwise. */
#if !defined(WITH_WOLFSSL) && defined(OPENSSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER >= 0x10100000L
#define SSL_READAHEAD 1
#else
#define SSL_READAHEAD 0
#endif
//
// Release of opaque structures
//

17
src/ssllib.c
View File

@ -261,8 +261,25 @@ int ssl_write(SSL_CONN connection, void * buf, int bufsize)
int ssl_pending(SSL_CONN connection)
{
ssl_conn *conn = (ssl_conn *) connection;
#if SSL_READAHEAD
char c;
int res;
if(SSL_pending(conn->ssl) > 0) return 1;
if(!SSL_has_pending(conn->ssl)) return 0;
/* Read ahead and not decrypted: a record, or only a part of one. A
part is no data, and saying so would have poll() return at once,
again and again, without its timeout, until the rest came: it is
pending only once the record is whole (or the connection ended),
the socket polled for the rest otherwise. The sockets are not
blocking, so this does not wait. */
res = SSL_peek(conn->ssl, &c, 1);
if(res > 0) return 1;
res = SSL_get_error(conn->ssl, res);
return res != SSL_ERROR_WANT_READ && res != SSL_ERROR_WANT_WRITE;
#else
return SSL_pending(conn->ssl);
#endif
}
void ssl_conn_free(SSL_CONN connection)