FTP: perform active connections non-blocking

1- Two new error codes are introduced.

CURLE_FTP_ACCEPT_FAILED to be set whenever ACCEPTing fails because of
FTP server connected.

CURLE_FTP_ACCEPT_TIMEOUT to be set whenever ACCEPTing timeouts.

Neither of these errors are considered fatal and control connection
remains OK because it could just be a firewall blocking server to
connect to the client.

2- One new setopt option was introduced.

CURLOPT_ACCEPTTIMEOUT_MS

It sets the maximum amount of time FTP client is going to wait for a
server to connect. Internal default accept timeout is 60 seconds.

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index a4aadb28d..b952e920a 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -1677,6 +1677,13 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
     data->set.connecttimeout = va_arg(param, long);
     break;
 
+  case CURLOPT_ACCEPTTIMEOUT_MS:
+    /*
+     * The maximum time you allow curl to wait for server connect
+     */
+    data->set.accepttimeout = va_arg(param, long);
+    break;
+
   case CURLOPT_USERPWD:
     /*
      * user:password to use in the operation
@@ -5457,7 +5464,7 @@ CURLcode Curl_do_more(struct connectdata *conn)
   if(conn->handler->do_more)
     result = conn->handler->do_more(conn);
 
-  if(result == CURLE_OK)
+  if(result == CURLE_OK && conn->bits.wait_data_conn == FALSE)
     /* do_complete must be called after the protocol-specific DO function */
     do_complete(conn);