authneg: clear auth.multi flag at http_done

This flag is meant for the current request based on authentication
state, once the request is done we can clear the flag.

Also change auth.multi to auth.multipass for better readability.

See discussion at curl#1095

Signed-off-by: Isaac Boukris <iboukris@gmail.com>
Reported-by: Michael Kaufmann

lib/http.c

@@ -645,10 +645,10 @@ output_auth_headers(struct connectdata *conn,
           proxy ? "Proxy" : "Server", auth,
           proxy ? (conn->http_proxy.user ? conn->http_proxy.user : "") :
                   (conn->user ? conn->user : ""));
-    authstatus->multi = (!authstatus->done) ? TRUE : FALSE;
+    authstatus->multipass = (!authstatus->done) ? TRUE : FALSE;
   }
   else
-    authstatus->multi = FALSE;
+    authstatus->multipass = FALSE;
 
   return CURLE_OK;
 }
@@ -1426,6 +1426,11 @@ CURLcode Curl_http_done(struct connectdata *conn,
   struct Curl_easy *data = conn->data;
   struct HTTP *http = data->req.protop;
 
+  /* Clear multipass flag. If authentication isn't done yet, then it will get
+   * a chance to be set back to true when we output the next auth header */
+  data->state.authhost.multipass = FALSE;
+  data->state.authproxy.multipass = FALSE;
+
   Curl_unencode_cleanup(conn);
 
 #ifdef USE_SPNEGO
@@ -1862,7 +1867,7 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
   if(result)
     return result;
 
-  if((data->state.authhost.multi || data->state.authproxy.multi) &&
+  if((data->state.authhost.multipass || data->state.authproxy.multipass) &&
      (httpreq != HTTPREQ_GET) &&
      (httpreq != HTTPREQ_HEAD)) {
     /* Auth is required and we are not authenticated yet. Make a PUT or POST

lib/urldata.h

@@ -1278,8 +1278,8 @@ struct auth {
                           this resource */
   bool done;  /* TRUE when the auth phase is done and ready to do the *actual*
                  request */
-  bool multi; /* TRUE if this is not yet authenticated but within the auth
-                 multipass negotiation */
+  bool multipass; /* TRUE if this is not yet authenticated but within the
+                      auth multipass negotiation */
   bool iestyle; /* TRUE if digest should be done IE-style or FALSE if it should
                    be RFC compliant */
 };