rewrite_guide_advanced.html

这个是我在web培训时老师提供的手册

}

$buffer = &readfile($QS_f);
&print_http_headers_multipart_begin;
&displayhtml($buffer);

sub mystat {
    local($file) = $_[0];
    local($time);

    ($x, $x, $x, $x, $x, $x, $x, $x, $x, $mtime) = stat($file);
    return $mtime;
}

$mtimeL = &mystat($QS_f);
$mtime = $mtime;
for ($n = 0; $n < $QS_n; $n++) {
    while (1) {
        $mtime = &mystat($QS_f);
        if ($mtime ne $mtimeL) {
            $mtimeL = $mtime;
            sleep(2);
            $buffer = &readfile($QS_f);
            &print_http_headers_multipart_next;
            &displayhtml($buffer);
            sleep(5);
            $mtimeL = &mystat($QS_f);
            last;
        }
        sleep($QS_s);
    }
}

&print_http_headers_multipart_end;

exit(0);

##EOF##
</pre></div>
        </dd>
      </dl>

    

    <h3>Mass Virtual Hosting</h3>

      

      <dl>
        <dt>Description:</dt>

        <dd>
          <p><code class="directive"><a href="../mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code> feature of Apache is nice
          and works great when you just have a few dozens
          virtual hosts. But when you are an ISP and have hundreds of
          virtual hosts to provide this feature is not the best
          choice.</p>
        </dd>

        <dt>Solution:</dt>

        <dd>
          <p>To provide this feature we map the remote webpage or even
          the complete remote webarea to our namespace by the use
          of the <dfn>Proxy Throughput</dfn> feature (flag <code>[P]</code>):</p>

<div class="example"><pre>
##
##  vhost.map
##
www.vhost1.dom:80  /path/to/docroot/vhost1
www.vhost2.dom:80  /path/to/docroot/vhost2
     :
www.vhostN.dom:80  /path/to/docroot/vhostN
</pre></div>

<div class="example"><pre>
##
##  httpd.conf
##
    :
#   use the canonical hostname on redirects, etc.
UseCanonicalName on

    :
#   add the virtual host in front of the CLF-format
CustomLog  /path/to/access_log  "%{VHOST}e %h %l %u %t \"%r\" %&gt;s %b"
    :

#   enable the rewriting engine in the main server
RewriteEngine on

#   define two maps: one for fixing the URL and one which defines
#   the available virtual hosts with their corresponding
#   DocumentRoot.
RewriteMap    lowercase    int:tolower
RewriteMap    vhost        txt:/path/to/vhost.map

#   Now do the actual virtual host mapping
#   via a huge and complicated single rule:
#
#   1. make sure we don't map for common locations
RewriteCond   %{REQUEST_URI}  !^/commonurl1/.*
RewriteCond   %{REQUEST_URI}  !^/commonurl2/.*
    :
RewriteCond   %{REQUEST_URI}  !^/commonurlN/.*
#
#   2. make sure we have a Host header, because
#      currently our approach only supports
#      virtual hosting through this header
RewriteCond   %{HTTP_HOST}  !^$
#
#   3. lowercase the hostname
RewriteCond   ${lowercase:%{HTTP_HOST}|NONE}  ^(.+)$
#
#   4. lookup this hostname in vhost.map and
#      remember it only when it is a path
#      (and not "NONE" from above)
RewriteCond   ${vhost:%1}  ^(/.*)$
#
#   5. finally we can map the URL to its docroot location
#      and remember the virtual host for logging puposes
RewriteRule   ^/(.*)$   %1/$1  [E=VHOST:${lowercase:%{HTTP_HOST}}]
    :
</pre></div>
        </dd>
      </dl>

    

  </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="access" id="access">Access Restriction</a></h2>

    

    <h3>Host Deny</h3>

      

      <dl>
        <dt>Description:</dt>

        <dd>
          <p>How can we forbid a list of externally configured hosts
          from using our server?</p>
        </dd>

        <dt>Solution:</dt>

        <dd>
          <p>For Apache &gt;= 1.3b6:</p>

<div class="example"><pre>
RewriteEngine on
RewriteMap    hosts-deny  txt:/path/to/hosts.deny
RewriteCond   ${hosts-deny:%{REMOTE_HOST}|NOT-FOUND} !=NOT-FOUND [OR]
RewriteCond   ${hosts-deny:%{REMOTE_ADDR}|NOT-FOUND} !=NOT-FOUND
RewriteRule   ^/.*  -  [F]
</pre></div>

          <p>For Apache &lt;= 1.3b6:</p>

<div class="example"><pre>
RewriteEngine on
RewriteMap    hosts-deny  txt:/path/to/hosts.deny
RewriteRule   ^/(.*)$ ${hosts-deny:%{REMOTE_HOST}|NOT-FOUND}/$1
RewriteRule   !^NOT-FOUND/.* - [F]
RewriteRule   ^NOT-FOUND/(.*)$ ${hosts-deny:%{REMOTE_ADDR}|NOT-FOUND}/$1
RewriteRule   !^NOT-FOUND/.* - [F]
RewriteRule   ^NOT-FOUND/(.*)$ /$1
</pre></div>

<div class="example"><pre>
##
##  hosts.deny
##
##  ATTENTION! This is a map, not a list, even when we treat it as such.
##             mod_rewrite parses it for key/value pairs, so at least a
##             dummy value "-" must be present for each entry.
##

193.102.180.41 -
bsdti1.sdm.de  -
192.76.162.40  -
</pre></div>
        </dd>
      </dl>

    

    <h3>Proxy Deny</h3>

      

      <dl>
        <dt>Description:</dt>

        <dd>
          <p>How can we forbid a certain host or even a user of a
          special host from using the Apache proxy?</p>
        </dd>

        <dt>Solution:</dt>

        <dd>
          <p>We first have to make sure <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>
          is below(!) <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> in the Configuration
          file when compiling the Apache webserver. This way it gets
          called <em>before</em> <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>. Then we
          configure the following for a host-dependent deny...</p>

<div class="example"><pre>
RewriteCond %{REMOTE_HOST} <strong>^badhost\.mydomain\.com$</strong>
RewriteRule !^http://[^/.]\.mydomain.com.*  - [F]
</pre></div>

          <p>...and this one for a user@host-dependent deny:</p>

<div class="example"><pre>
RewriteCond %{REMOTE_IDENT}@%{REMOTE_HOST}  <strong>^badguy@badhost\.mydomain\.com$</strong>
RewriteRule !^http://[^/.]\.mydomain.com.*  - [F]
</pre></div>
        </dd>
      </dl>

    

    <h3>Special Authentication Variant</h3>

      

      <dl>
        <dt>Description:</dt>

        <dd>
          <p>Sometimes a very special authentication is needed, for
          instance a authentication which checks for a set of
          explicitly configured users. Only these should receive
          access and without explicit prompting (which would occur
          when using the Basic Auth via <code class="module"><a href="../mod/mod_auth.html">mod_auth</a></code>).</p>
        </dd>

        <dt>Solution:</dt>

        <dd>
          <p>We use a list of rewrite conditions to exclude all except
          our friends:</p>

<div class="example"><pre>
RewriteCond %{REMOTE_IDENT}@%{REMOTE_HOST} <strong>!^[e-mail]-corp\.com$</strong>
RewriteCond %{REMOTE_IDENT}@%{REMOTE_HOST} <strong>!^friend2</strong>@client2.quux-corp\.com$
RewriteCond %{REMOTE_IDENT}@%{REMOTE_HOST} <strong>!^friend3</strong>@client3.quux-corp\.com$
RewriteRule ^/~quux/only-for-friends/      -                                 [F]
</pre></div>
        </dd>
      </dl>

    

    <h3>Referer-based Deflector</h3>

      

      <dl>
        <dt>Description:</dt>

        <dd>
          <p>How can we program a flexible URL Deflector which acts
          on the "Referer" HTTP header and can be configured with as
          many referring pages as we like?</p>
        </dd>

        <dt>Solution:</dt>

        <dd>
          <p>Use the following really tricky ruleset...</p>

<div class="example"><pre>
RewriteMap  deflector txt:/path/to/deflector.map

RewriteCond %{HTTP_REFERER} !=""
RewriteCond ${deflector:%{HTTP_REFERER}} ^-$
RewriteRule ^.* %{HTTP_REFERER} [R,L]

RewriteCond %{HTTP_REFERER} !=""
RewriteCond ${deflector:%{HTTP_REFERER}|NOT-FOUND} !=NOT-FOUND
RewriteRule ^.* ${deflector:%{HTTP_REFERER}} [R,L]
</pre></div>

          <p>... in conjunction with a corresponding rewrite
          map:</p>

<div class="example"><pre>
##
##  deflector.map
##

http://www.badguys.com/bad/index.html    -
http://www.badguys.com/bad/index2.html   -
http://www.badguys.com/bad/index3.html   http://somewhere.com/
</pre></div>

          <p>This automatically redirects the request back to the
          referring page (when "<code>-</code>" is used as the value
          in the map) or to a specific URL (when an URL is specified
          in the map as the second argument).</p>
        </dd>
      </dl>

    

  </div></div>
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