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From Tim Bishop <tbis...@netspace.org>
Subject mod_rewrite/6910: Vary header not always set with [ORed] RewriteCond directives
Date Wed, 29 Nov 2000 20:18:15 GMT

>Number:         6910
>Category:       mod_rewrite
>Synopsis:       Vary header not always set with [ORed] RewriteCond directives
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Nov 29 12:20:04 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     tbishop@netspace.org
>Release:        1.3.14
>Organization:
apache
>Environment:
Linux web2.activespace.com 2.2.14 #3 Fri Feb 18 11:55:09 PST 2000 i686 unknown
$ gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
$ /usr/sbin/httpd -V
Server version: Apache/1.3.12 (Unix)
Server built:   Jul 11 2000 16:18:51
Server's Module Magic Number: 19990320:7
Server compiled with....
 -D EAPI
 -D HAVE_MMAP
 -D HAVE_SHMGET
 -D USE_SHMGET_SCOREBOARD
 -D USE_MMAP_FILES
 -D USE_FCNTL_SERIALIZED_ACCEPT
 -D HTTPD_ROOT="/usr"
 -D SUEXEC_BIN="/usr/sbin/suexec"
 -D DEFAULT_PIDLOG="/var/run/httpd.pid"
 -D DEFAULT_SCOREBOARD="/var/run/httpd.scoreboard"
 -D DEFAULT_LOCKFILE="/var/run/httpd.lock"
 -D DEFAULT_XFERLOG="/var/log/httpd/access_log"
 -D DEFAULT_ERRORLOG="/var/log/httpd/error_log"
 -D TYPES_CONFIG_FILE="/etc/httpd/conf/mime.types"
 -D SERVER_CONFIG_FILE="/etc/httpd/conf/httpd.conf"
 -D ACCESS_CONFIG_FILE="/etc/httpd/conf/access.conf"
 -D RESOURCE_CONFIG_FILE="/etc/httpd/conf/srm.conf"
$ /usr/sbin/httpd -l
Compiled-in modules:
  http_core.c
  mod_so.c
  mod_perl.c
suexec: disabled; invalid wrapper /usr/sbin/suexec
>Description:
mod_rewrite will automatically add to the Vary header if it performs some
RewriteRule based on the contents of an incoming header.

I found that the Vary header was not appropriately updated if the
RewriteRule was triggered by short-circuiting OR RewriteCond conditions.

>How-To-Repeat:
To replicate the bug, try this formulation:

RewriteEngine  On
RewriteLogLevel  10
RewriteCond %{HTTP:FOO}   ^(alice)$       [OR]
RewriteCond %{HTTP:FOO}   ^(bob)$
RewriteRule ^/             -              [E=CRYPTO_NAMES:%1] 

Currently, The 'Vary: Foo' header is only set if 'Foo: bob' is sent by the client.  
The patch fixes things so that the 'Vary: Foo' header is set in either
case.

>Fix:
diff -cw apache_1.3.14_orig_mod_rewrite.c
apache_1.3.14_new_mod_rewrite.c
*** apache_1.3.14_orig_mod_rewrite.c    Fri Nov 17 21:33:54 2000
--- apache_1.3.14_new_mod_rewrite.c     Fri Nov 17 21:35:18 2000
***************
*** 1843,1848 ****
--- 1843,1856 ----
                      i++;
                      c = &conds[i];
                  }
+ 
+                 /* Propogate Vary info from satisfied OR case before
continuing */
+                 vary = ap_table_get(r->notes, VARY_KEY_THIS);
+                 if (vary != NULL) {
+                     ap_table_merge(r->notes, VARY_KEY, vary);
+                     ap_table_unset(r->notes, VARY_KEY_THIS);
+                 }
+ 
                  continue;
              }
          }
>Release-Note:
>Audit-Trail:
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