[core] disable streaming response with authorizer (fixes #3106)

disable streaming response while processing "authorizer" mode
until "authorizer" response 200 OK from the backend is complete

(thx jefftharris)

x-ref:
  "FastCGI authorizer hang with server.stream-response-body"
  https://redmine.lighttpd.net/boards/2/topics/9969
  "FastCGI authorizer hang with server.stream-response-body"
  https://redmine.lighttpd.net/issues/3106

src/gw_backend.c

@@ -2290,6 +2290,9 @@ static handler_t gw_recv_response(gw_handler_ctx * const hctx, request_st * cons
                 physpath = r->physical.path.ptr;
             }
 
+            /*(restore streaming flags removed during authorizer processing)*/
+            r->conf.stream_response_body |= (hctx->opts.authorizer >> 1);
+
             gw_backend_close(hctx, r);
             handler_ctx_clear(hctx);
 

src/mod_ajp13.c

@@ -838,6 +838,12 @@ ajp13_recv_parse (request_st * const r, struct http_response_opts_t * const opts
                      (r->http_status == 0 || r->http_status == 200)) {
                     /* authorizer approved request; ignore the content here */
                     hctx->send_content_body = 0;
+                    opts->authorizer |= /*(save response streaming flags)*/
+                      (r->conf.stream_response_body
+                       & (FDEVENT_STREAM_RESPONSE
+                         |FDEVENT_STREAM_RESPONSE_BUFMIN)) << 1;
+                    r->conf.stream_response_body &=
+                      ~(FDEVENT_STREAM_RESPONSE|FDEVENT_STREAM_RESPONSE_BUFMIN);
                 }
             }
             else {

src/mod_fastcgi.c

@@ -445,6 +445,12 @@ static handler_t fcgi_recv_parse(request_st * const r, struct http_response_opts
 					 (r->http_status == 0 || r->http_status == 200)) {
 					/* authorizer approved request; ignore the content here */
 					hctx->send_content_body = 0;
+					opts->authorizer |= /*(save response streaming flags)*/
+					  (r->conf.stream_response_body
+					   & (FDEVENT_STREAM_RESPONSE
+					     |FDEVENT_STREAM_RESPONSE_BUFMIN)) << 1;
+					r->conf.stream_response_body &=
+					  ~(FDEVENT_STREAM_RESPONSE|FDEVENT_STREAM_RESPONSE_BUFMIN);
 				}
 			} else if (hctx->send_content_body) {
 				if (0 != mod_fastcgi_transfer_cqlen(r, hctx->rb, packet.len - packet.padding)) {

src/response.h

@@ -24,7 +24,7 @@ typedef struct http_response_opts_t {
   uint32_t max_per_read;
   int fdfmt;
   int backend;
-  int authorizer; /* bool */
+  int authorizer; /* bool *//*(maybe overloaded w/ response streaming flags)*/
   uint8_t simple_accum; /* bool */
   uint8_t local_redir; /* 0,1,2 */
   uint8_t xsendfile_allow; /* bool */