multi: progress function abort must close connection

When the progress function returns to cancel the request, we must mark
the connection to get closed and it must do to the DONE state.

do_init() must be called as early as possible so that state variables
for new connections are reset early. We could otherwise see that the old
values were still there when a connection was to be disconnected very
early and it would make it behave wrongly.

Bug: http://curl.haxx.se/mail/lib-2011-10/0006.html
Reported by: Vladimir Grishchenko

lib/multi.c

@@ -1657,8 +1657,14 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
       }
       /* if there's still a connection to use, call the progress function */
       else if(easy->easy_conn && Curl_pgrsUpdate(easy->easy_conn)) {
-        easy->result = CURLE_ABORTED_BY_CALLBACK;
-        multistate(easy, CURLM_STATE_COMPLETED);
+        /* aborted due to progress callback return code must close the
+           connection */
+        easy->easy_conn->bits.close = TRUE;
+
+        /* if not yet in DONE state, go there, otherwise COMPLETED */
+        multistate(easy, (easy->state < CURLM_STATE_DONE)?
+                   CURLM_STATE_DONE: CURLM_STATE_COMPLETED);
+        result = CURLM_CALL_MULTI_PERFORM;
       }
     }
   } WHILE_FALSE; /* just to break out from! */

lib/url.c

@@ -136,6 +136,7 @@ int curl_win32_idn_to_ascii(const char *in, char **out);
 static long ConnectionKillOne(struct SessionHandle *data);
 static void conn_free(struct connectdata *conn);
 static void signalPipeClose(struct curl_llist *pipeline, bool pipe_broke);
+static CURLcode do_init(struct connectdata *conn);
 
 /*
  * Protocol table.
@@ -4988,6 +4989,9 @@ static CURLcode create_conn(struct SessionHandle *data,
     ConnectionStore(data, conn);
   }
 
+  /* Setup and init stuff before DO starts, in preparing for the transfer. */
+  do_init(conn);
+
   /*
    * Setup whatever necessary for a resumed transfer
    */
@@ -5334,9 +5338,6 @@ CURLcode Curl_do(struct connectdata **connp, bool *done)
   struct connectdata *conn = *connp;
   struct SessionHandle *data = conn->data;
 
-  /* setup and init stuff before DO starts, in preparing for the transfer */
-  do_init(conn);
-
   if(conn->handler->do_it) {
     /* generic protocol-specific function pointer set in curl_connect() */
     result = conn->handler->do_it(conn, done);