TLS: PIPELINING under OpenSSL

[exim.git] / src / src / tls-openssl.c

diff --git a/src/src/tls-openssl.c b/src/src/tls-openssl.c
index f17d94b5f85c6a8f2c3c154035ef5103f648e235..c09d9bdf6211c545e57c4496727d5dff81398fe4 100644 (file)
--- a/src/src/tls-openssl.c
+++ b/src/src/tls-openssl.c
@@ -1875,7 +1875,7 @@ static uschar cipherbuf[256];
 if (tls_in.active >= 0)
   {
   tls_error(US"STARTTLS received after TLS started", NULL, US"", errstr);
-  smtp_printf("554 Already in TLS\r\n");
+  smtp_printf("554 Already in TLS\r\n", FALSE);
   return FAIL;
   }
 
@@ -1959,7 +1959,7 @@ mode, the fflush() happens when smtp_getc() is called. */
 SSL_set_session_id_context(server_ssl, sid_ctx, Ustrlen(sid_ctx));
 if (!tls_in.on_connect)
   {
-  smtp_printf("220 TLS go ahead\r\n");
+  smtp_printf("220 TLS go ahead\r\n", FALSE);
   fflush(smtp_out);
   }
 
@@ -2480,6 +2480,12 @@ if (n > 0)
 }
 
 
+BOOL
+tls_could_read(void)
+{
+return ssl_xfer_buffer_lwm < ssl_xfer_buffer_hwm || SSL_pending(server_ssl) > 0;
+}
+
 
 /*************************************************
 *          Read bytes from TLS channel           *
@@ -2533,6 +2539,7 @@ Arguments:
   is_server channel specifier
   buff      buffer of data
   len       number of bytes
+  more     further data expected soon
 
 Returns:    the number of bytes after a successful write,
             -1 after a failed write
@@ -2541,15 +2548,32 @@ Used by both server-side and client-side TLS.
 */
 
 int
-tls_write(BOOL is_server, const uschar *buff, size_t len)
+tls_write(BOOL is_server, const uschar *buff, size_t len, BOOL more)
 {
-int outbytes;
-int error;
-int left = len;
+int outbytes, error, left;
 SSL *ssl = is_server ? server_ssl : client_ssl;
+static uschar * corked = NULL;
+static int c_size = 0, c_len = 0;
+
+DEBUG(D_tls) debug_printf("%s(%p, %d%s)\n", __FUNCTION__,
+  buff, left, more ? ", more" : "");
+
+/* Lacking a CORK or MSG_MORE facility (such as GnuTLS has) we copy data when
+"more" is notified.  This hack is only ok if small amounts are involved AND only
+one stream does it, in one context (i.e. no store reset).  Currently it is used
+for the responses to the received SMTP MAIL , RCPT, DATA sequence, only. */
+
+if (is_server && (more || corked))
+  {
+  corked = string_catn(corked, &c_size, &c_len, buff, len);
+  if (more)
+    return len;
+  buff = CUS corked;
+  len = c_len;
+  corked = NULL; c_size = c_len = 0;
+  }
 
-DEBUG(D_tls) debug_printf("tls_do_write(%p, %d)\n", buff, left);
-while (left > 0)
+for (left = len; left > 0;)
   {
   DEBUG(D_tls) debug_printf("SSL_write(SSL, %p, %d)\n", buff, left);
   outbytes = SSL_write(ssl, CS buff, left);