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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 38408] New: - SSI environment vars not set in spawned processes
Date Thu, 26 Jan 2006 23:11:42 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=38408

           Summary: SSI environment vars not set in spawned processes
           Product: Apache httpd-2
           Version: 2.2.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_include
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: scl@virginia.edu


Apache 2.2 uses "lazy" evaluation of the SSI specific environment variables
LAST_MODIFIED, DATE_GMT, DATE_LOCAL, etc.  These variables are initialized
with a pointer to a particular null string (LAZY_VALUE). If mod_include
references one of these variables and if its value is LAZY_VALUE, then
mod_include sets the variable to its actual value before using it.

When SSI spawns processes via <!--#exec ... --> or
<!--#include virtual= ... --> nothing is done to evaluate SSI variables
that are still set to LAZY_VALUE, so These variables end up in the
environment of the spawned process with null string values.

For example, suppose you have a CGI program named foo.cgi that uses
LAST_MODIFIED and suppose you have this in a html document:

<!--#include virtual="foo.cgi"-->    LAST_MODIFIED is the null string

<!--#echo var="LAST_MODIFIED"-->     mod_include evaluates LAST_MODIFIED

<!--#include virtual="foo.cgi"-->    Now LAST_MODIFIED has correct value

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