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|
<html><head><title>
Linklint Documentation - how it works
</title></head><body text="#000000" link="#6666aa" vlink="#6688aa" alink="#6688aa" bgcolor="#ffffff">
<font face="helvetica,sans serif,ariel">
<font size=5>
<a name=top>
Linklint Documentation - how it works
</a>
</font>
<table cellpadding=0 cellspacing=2 border=0 width="90%">
<tr><td bgcolor="#8888dd"><img src=dot.gif width=1 height=1 alt=""></td></tr>
</table>
<font size=3>
Version 2.3.5 August 13, 2001
</font>
<p>
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<table cellpadding=0 cellspacing=0 border=0 bgcolor="#8888dd">
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<td bgcolor="white" align=right>
<font face="helvetica,sans serif,ariel"><font color="#8888dd"><b>
documentation
</b></font></font>
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</table></td></tr></table>
</td><td>
<table cellpadding=0 cellspacing=0 border=0 bgcolor="#8888dd">
<tr><td>
<table bgcolor="ddddff" cellpadding=2 cellspacing=1 border=0>
<tr>
<td align=center bgcolor="#ddddff">
<font face="helvetica,sans serif,ariel">
<a href="index.html">
Introduction
</a>
</font></td>
<td align=center bgcolor="#ddddff">
<font face="helvetica,sans serif,ariel">
<a href="new.html">
What's New
</a>
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<td align=center bgcolor="#ddddff">
<font face="helvetica,sans serif,ariel">
<a href="inputs.html">
Inputs
</a>
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<font face="helvetica,sans serif,ariel">
<a href="outputs.html">
Outputs
</a>
</font></td>
<td align=center bgcolor="#ddddff">
<font face="helvetica,sans serif,ariel">
<a href="hints.html">
Hints
</a>
</font></td>
<td align=center bgcolor="white">
<font face="helvetica,sans serif,ariel"><font color="#dd6666">
How it works
</font>
</font></td>
<td align=center bgcolor="#ddddff">
<font face="helvetica,sans serif,ariel">
<a href="bugs.html">
Bugs
</a>
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<td align=center bgcolor="#ddddff">
<font face="helvetica,sans serif,ariel">
<a href="doc_index.html">
Index
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</tr>
</table></td></tr></table>
</td></tr>
<tr><td align=right>
<table cellpadding=0 cellspacing=0 border=0 bgcolor="#8888dd">
<tr><td>
<table bgcolor="ddddff" cellpadding=2 cellspacing=1 border=0>
<tr><td bgcolor="white" align=right>
<font face="helvetica,sans serif,ariel">
<font color="#8888dd">
<b>
on this page
</b>
</font>
</font>
</td>
</tr>
</table></td></tr></table>
</td><td>
<table cellpadding=0 cellspacing=0 border=0 bgcolor="#8888dd">
<tr><td>
<table bgcolor="ddddff" cellpadding=2 cellspacing=1 border=0>
<tr><td bgcolor="#f8f8ff">
<font face="helvetica,sans serif,ariel">
<a href="#linkset">
Seeds
</a>
·
<a href="#recursion">
Recursion
</a>
·
<a href="#parse">
Parsing
</a>
·
<a href="#resolve">
Resolving links
</a>
·
<a href="#default">
Default Files
</a>
·
<a href="#imagemap">
Image Maps
</a>
·
<a href="#status_cache">
Status Cache
</a>
</font>
</td></tr></table>
</td></tr></table>
</td></tr></table>
<blockquote>
This page explains in more detail how Linklint performs site checks.
</font>
</blockquote>
<table bgcolor="#8888dd" width="90%" cellpadding=3 cellspacing=2 border=0>
<tr>
<td>
<font face="helvetica,sans serif,ariel">
<font size=3 color="#ffffff"><b>
<a name="linkset">
Creating Seeds for a Site Check
</a>
</b></font>
</font>
</td></tr></table>
<font face="helvetica,sans serif,ariel"><font size=2>
<a href="#top"> (top)</a>
<a href="doc_index.html#command_index"> (command index)</a>
<a href="doc_index.html#topic_index"> (topic index)</a>
</font></font>
<blockquote>
<font face="helvetica,sans serif,ariel">
A linkset (entered on the command line) specifies a set of links to
check. For each linkset a <i>seed</i> is created for starting
Linklint's search of your site. If the linkset contains no wildcard
characters (<tt><b>@</b></tt> and <tt><b>#</b></tt>), it must be a single link and the complete
linkset becomes a seed file. If the linkset contains wildcard
characters, the seed is the longest string of non-wildcard characters
starting with the leading "/" and ending with the last "/" before a
wildcard. For example, if you specify <tt><b>/@</b></tt> to check your
entire site, Linklint will start with one seed file "/" which is the
<b><a href="#default">default file</a></b> for your root directory (sometimes
called your <i>home page</i>).
<p>
Linklint does not have (or need) a <i>-seed</i> option. A linkset
without wildcard characters is the same thing as a seed file. In
fact, if you have a list of specific HTML pages to check, just put the
paths, (one per line) in a file and tell Linklint that this is a
command file (single leading @ sign before the filename). Make sure
that you list only the paths (no http://, and no hostname) otherwise
Linklint will do a remote URL check on your pages (it will see if the
pages exist but it won't check the links on your pages).
</font>
</blockquote>
<table bgcolor="#8888dd" width="90%" cellpadding=3 cellspacing=2 border=0>
<tr>
<td>
<font face="helvetica,sans serif,ariel">
<font size=3 color="#ffffff"><b>
<a name="recursion">
Site Check Recursion
</a>
</b></font>
</font>
</td></tr></table>
<font face="helvetica,sans serif,ariel"><font size=2>
<a href="#top"> (top)</a>
<a href="doc_index.html#command_index"> (command index)</a>
<a href="doc_index.html#topic_index"> (topic index)</a>
</font></font>
<blockquote>
<font face="helvetica,sans serif,ariel">
Linklint tries to find all of the pages and files in a site using
recursion. Each seed is checked and if it is an HTML file it is
parsed creating a new list of files to check. These files are
checked creating new lists of files to check and so on. This process
continues until one of the mechanisms to stop recursion kicks in.
<p>
The primary method used to stop recursion is to only check local
links. A link is considered local if either: it resolves to a file
reference without a scheme or host (<i>i.e.</i> <tt>/something</tt>),
or it resolves to <tt>http://hostname/. . .</tt> and <i>-host
hostname</i> was specified.
<p>
The second method for halting recursion is the use of specific
linksets. Only HTML pages that match one or more of the linksets
you specify will be checked for more links. HTML pages which don't
match any of the linksets will be <i>skipped,</i> which means they are
checked to see if they exist but none of the links inside the file
are added to the list of files to check. You can also specifically
<i>-skip</i> sets of HTML files or <i>-limit</i> the total number of
HTML files checked.
</font>
</blockquote>
<table bgcolor="#8888dd" width="90%" cellpadding=3 cellspacing=2 border=0>
<tr>
<td>
<font face="helvetica,sans serif,ariel">
<font size=3 color="#ffffff"><b>
<a name="parse">
Parsing HTML Files
</a>
</b></font>
</font>
</td></tr></table>
<font face="helvetica,sans serif,ariel"><font size=2>
<a href="#top"> (top)</a>
<a href="doc_index.html#command_index"> (command index)</a>
<a href="doc_index.html#topic_index"> (topic index)</a>
</font></font>
<blockquote>
<font face="helvetica,sans serif,ariel">
These are the rules Linklint uses to extract links from HTML files.
<p>
Any tags inclosed inside of comments tags:
<tt><b><!-- . . . --></b></tt><br>
or script tags:
<tt><b><script> . . . </script></b></tt>
are ignored.
<p>
The <tt><b><base href=<font color="#009900">URL</font>></b></tt> tag will cause Linklint to set
the base scheme, host, path, and file to the appropriate parts of
<tt><font color="#009900">URL</font></tt> for the remainder of the file. I've tried to emulate
the behavior of the Netscape Navigator 3.0 browser. In general
missing elements from the front part of a url are filled in from the
base specification.
<p>
Links are extracted from the following tags:
<p>
<table cellspacing=0 cellpadding=0 border=0>
<tr>
<td><img src=dot.gif width=20 height=1 alt=""></td>
<td align=right>
<font face="helvetica,sans serif,ariel">
<a </font></td>
<td><font face="helvetica,sans serif,ariel">
href=<font color="#cc0000">LINK</font> name=<font color="#009900">NAME</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<applet </font></td>
<td><font face="helvetica,sans serif,ariel">
code=<font color="#cc0000">LINK</font> codebase=<font color="#009900">BASE</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<area </font></td>
<td><font face="helvetica,sans serif,ariel">
href=<font color="#cc0000">LINK</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<bgsound </font></td>
<td><font face="helvetica,sans serif,ariel">
src=<font color="#cc0000">LINK</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<body </font></td>
<td><font face="helvetica,sans serif,ariel">
background=<font color="#cc0000">LINK</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<embed </font></td>
<td><font face="helvetica,sans serif,ariel">
src=<font color="#cc0000">LINK</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<form </font></td>
<td><font face="helvetica,sans serif,ariel">
action=<font color="#cc0000">LINK</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<frame </font></td>
<td><font face="helvetica,sans serif,ariel">
src=<font color="#cc0000">LINK</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<img </font></td>
<td><font face="helvetica,sans serif,ariel">
src=<font color="#cc0000">LINK</font> lowsrc=<font color="#cc0000">LINK</font> dynsrc=<font color="#cc0000">LINK</font> usemap=<font color="#009900">NAME</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<input </font></td>
<td><font face="helvetica,sans serif,ariel">
src=<font color="#cc0000">LINK</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<map </font></td>
<td><font face="helvetica,sans serif,ariel">
name=<font color="#009900">NAME</font>>
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<meta </font></td>
<td><font face="helvetica,sans serif,ariel">
http-equiv=refresh content="... href=<font color="#cc0000">LINK</font>">
</font></td></tr>
<tr>
<td></td>
<td align=right><font face="helvetica,sans serif,ariel">
<script </font></td>
<td><font face="helvetica,sans serif,ariel">
src=<font color="#cc0000">LINK</font>>
</font></td></tr></table>
<p>
Tag and attribute names are case insensitive. A <tt><font color="#cc0000">LINK</font></tt> can
be bare or enclosed in single or double quotes. The characters
<tt><b><</b></tt> and <tt><b>></b></tt> are allowed inside of a tag only if
they are enclosed in single or double quotes. Arbitrary whitespace
is allowed around the <tt><b>=</b></tt> sign and between a tag's name and
its attributes.
<p>
Tags and/or attributes that do not match any of the above criteria
are ignored.
<p>
All the links found on an HTML page are checked. Non-HTML links are
checked only for existence. If a link is to an HTML file, it will
also get parsed subject to the rules of <b><a href="#recursion">recursion</a></b>.
</font>
</blockquote>
<table bgcolor="#8888dd" width="90%" cellpadding=3 cellspacing=2 border=0>
<tr>
<td>
<font face="helvetica,sans serif,ariel">
<font size=3 color="#ffffff"><b>
<a name="resolve">
Resolving Links
</a>
</b></font>
</font>
</td></tr></table>
<font face="helvetica,sans serif,ariel"><font size=2>
<a href="#top"> (top)</a>
<a href="doc_index.html#command_index"> (command index)</a>
<a href="doc_index.html#topic_index"> (topic index)</a>
</font></font>
<blockquote>
<font face="helvetica,sans serif,ariel">
In order to be able to follow links properly and to ensure that
links get checked only once, all links are made absolute before
they are checked. I have tried to use the same rules as a browser
for making links absolute. You can use the <i>-db3</i> flag to
see how links get resolved. This flag causes every tag from
an HTML file that contains a link to get printed out in the log
file followed by the fully expanded link.
<p>
If a <i>-host</i> is specified, links starting with
"<tt>http://host</tt>" have this text removed, creating a local link.
Thus all local links will start with "/" followed by a full path from
the server root to the file to be checked.
</font>
</blockquote>
<table bgcolor="#8888dd" width="90%" cellpadding=3 cellspacing=2 border=0>
<tr>
<td>
<font face="helvetica,sans serif,ariel">
<font size=3 color="#ffffff"><b>
<a name="default">
Default Index Files
</a>
</b></font>
</font>
</td></tr></table>
<font face="helvetica,sans serif,ariel"><font size=2>
<a href="#top"> (top)</a>
<a href="doc_index.html#command_index"> (command index)</a>
<a href="doc_index.html#topic_index"> (topic index)</a>
</font></font>
<blockquote>
<font face="helvetica,sans serif,ariel">
Http servers treat a link to a directory followed by a "/" as a
default file. The server will look for a (server specific) default
file in the directory and serve that up if it exists. Otherwise the
server will generate a listing of all of the files and subdirectories
in the directory.
<p>
Linklint emulates this behavior in local site checks by searching for
its own list of default files: <i>home.html, index.html, index.shtml,
index.htm, index.cgi, wwwhome.html, </i>and <i>welcome.html</i>. If
none of these are found, all the files and subdirectories in the
directory are checked. You can change the set of default files
Linklint looks for with the <i>-index filename</i> option which will
replace the built-in set with the file(s) you specify. On the
command line each default file must be preceded with the
<i>-index</i> flag. If all of the default files are in lowercase,
the search is case insensitive. If any of the files has an uppercase
letter, the search is case sensitive.
</font>
</blockquote>
<table bgcolor="#8888dd" width="90%" cellpadding=3 cellspacing=2 border=0>
<tr>
<td>
<font face="helvetica,sans serif,ariel">
<font size=3 color="#ffffff"><b>
<a name="imagemap">
Server-side Image Maps
</a>
</b></font>
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Linklint can check all links that are used in both client-side and
server-side image maps. Client-side image maps are handled
automatically since Linklint parses the <tt><area href=LINK></tt>
tag in HTML files.
<p>
Server-side image maps are a little bit tricky. Some servers have
the imagemap CGI software built-in so links ending in <i>.map</i> are
treated as map files and automatically sent to the image map program for
processing. Linklint mimics this behavior. Any link ending in
<i>.map</i> is parsed as if it were a map file. In addition, all
<i>.map</i> links are checked locally even if the <i>-http</i> flag
is used since map files are generally not accessible directly via http.
<p>
Some servers require server-side image map links to contains
the path of the CGI image map program followed by the path to the
map file as in:
<p>
<tt><a href=/cgi-bin/imagemap/dir/info.map></tt>.
<p>
Here <i>/cgi-bin/imagemap</i> is the location of the image map CGI
program and <i>/dir/info.map</i> is the location of the map file.
Linklint can resolve these links and read the map file (locally only,
even if <i>-http</i> is used). However, you must provide the path
from your server root directory to your image map program using the
<i>-map</i> option. Three common image map specifications are:
<ul><tt><b> <li>-map /cgi-bin/imagemap <li>-map /cgi-bin/imagemap.exe
<li>-map cgi-bin/htimage </b></tt></ul>
For example, if you set "<tt>-map /cgi-bin/imagemap</tt>", the link
<i>/cgi-bin/imagemap/dir/info.map</i> will be transformed to
<i>/dir/info.map</i> which will be read in locally and parsed as a
map file. You need to be sure to set <i>-root</i> properly for
Linklint to be able to find the map file.
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Linklint uses a combination of three different methods to keep track
of remote URL modification times:
<dl>
<dt> <b>Last-Modified date</b>
<dd> Many web servers, let Linklint know that last date a file
was modified. If this date is available for a page then Linklint
uses it for keeping track of changes.
<dt> <b>If-Modified-Since requests</b>
<dd> If the <i>Last-Modified</i> is not available then Linklint tries
an <i>If-Modified-Since</i> request. Linklint asks if the page
has been modified since the last time (according to Linklint) it
was checked.
<dt> <b>Checksum of the remote file</b>
<dd> If neither method above is available on a remote server then
Linklint reads in the entire remote file, makes a checksum
of its contents and uses this checksum to keep track of changes.
</dl>
These methods are totally transparent to the Linklint user (you). For
each URL the most efficient method is tried first, and the checksum
is only used as a last resort.
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Parsing
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Resolving links
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