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From Taketo Kabe <k...@sra-tohoku.co.jp>
Subject mod_log-any/8021: [PATCH] %b,%B in LogFormat not logged zero for HEAD request
Date Fri, 13 Jul 2001 10:31:25 GMT

>Number:         8021
>Category:       mod_log-any
>Synopsis:       [PATCH] %b,%B in LogFormat not logged zero for HEAD request
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Fri Jul 13 03:40:05 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     kabe@sra-tohoku.co.jp
>Release:        2.0.20
>Organization:
apache
>Environment:

SunOS 5.8 Generic_108528-05 sun4u sparc SUNW,Ultra-60
gcc version 2.95.2 19991024 (release)
./configure [--enable-log-config]

>Description:

The "%b" "%B" directives in LogFormat should indicate "-" or "0" for
HEAD requests, because no response body is sent --
but actually, the file size is logged.

This was because r->sent_bodyct flag, which tells logger to 
log r->bytes_sent, is set to 1 BEFORE checking & discarding the body in 
modules/http/http_protocol.c:ap_http_header_filter() .

Setting r->sent_bodyct AFTER checking for HEAD fixed it.

>How-To-Repeat:

* Setup a LogFormat with "%b" or "%B" within 
  (the default combined log is enough)
* Issue a HEAD request for a plain file.
* Examine the access_log.
  The 7th field (bytes transmitted) should be "-" or "0",
  but actually is the size of the file.

>Fix:

#
#****** modules/http/http_protocol.c HEAD logs full content bytes
#
# This patch fixes that "%b" "%B" (bytes sent, excluding response headers)
# directives for mod_log_config, is logged as full file size (should be zero).
#
##find httpd-2_0_20 -name '*.dist7' -exec ./0diff {} \;
/usr/local/gnu/bin/patch -p1 --backup --suffix=.dist7 << 'EOP'
=============================== {
diff -u httpd-2_0_20/modules/http/http_protocol.c.dist7 httpd-2_0_20/modules/http/http_protocol.c
--- httpd-2_0_20/modules/http/http_protocol.c.dist7	Fri Jul 13 07:32:53 2001
+++ httpd-2_0_20/modules/http/http_protocol.c	Fri Jul 13 07:37:42 2001
@@ -1206,14 +1206,14 @@
 
     terminate_header(b2);
 
-    r->sent_bodyct = 1;         /* Whatever follows is real body stuff... */
-
     ap_pass_brigade(f->next, b2);
 
     if (r->header_only) {
         apr_brigade_destroy(b);
         return OK;
     }
+
+    r->sent_bodyct = 1;         /* Whatever follows is real body stuff... */
 
     if (r->chunked) {
         /* We can't add this filter until we have already sent the headers.
=============================== }}
EOP

>Release-Note:
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