apache2::perlsections.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "mod_perl-2.0.2::docs::api::Apache2::PerlSections 3"
.TH mod_perl-2.0.2::docs::api::Apache2::PerlSections 3 "2005-10-21" "perl v5.10.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Apache2::PerlSections \- write Apache configuration files in Perl
.SH "Synopsis"
.IX Header "Synopsis"
.Vb 2
\&  <Perl>
\&  @PerlModule = qw(Mail::Send Devel::Peek);
\&  
\&  #run the server as whoever starts it
\&  $User  = getpwuid(>) || >;
\&  $Group = getgrgid()) || );
\&  
\&  $ServerAdmin = $User;
\&  
\&  </Perl>
.Ve
.SH "Description"
.IX Header "Description"
With \f(CW\*(C`<Perl>\*(C'\fR...\f(CW\*(C`</Perl>\*(C'\fR sections, it is possible
to configure your server entirely in Perl.
.PP
\&\f(CW\*(C`<Perl>\*(C'\fR sections can contain \fIany\fR and as much Perl code as
you wish. These sections are compiled into a special package whose
symbol table mod_perl can then walk and grind the names and values of
Perl variables/structures through the Apache core configuration gears.
.PP
Block sections such as \f(CW\*(C`<Location>\*(C'\fR..\f(CW\*(C`</Location>\*(C'\fR
are represented in a \f(CW%Location\fR hash, e.g.:
.PP
.Vb 10
\&  <Perl>
\&  $Location{"/~dougm/"} = {
\&    AuthUserFile   => \*(Aq/tmp/htpasswd\*(Aq,
\&    AuthType       => \*(AqBasic\*(Aq,
\&    AuthName       => \*(Aqtest\*(Aq,
\&    DirectoryIndex => [qw(index.html index.htm)],
\&    Limit          => {
\&        "GET POST"    => {
\&            require => \*(Aquser dougm\*(Aq,
\&        }
\&    },
\&  };
\&  </Perl>
.Ve
.PP
If an Apache directive can take two or three arguments you may push
strings (the lowest number of arguments will be shifted off the
\&\f(CW@list\fR) or use an array reference to handle any number greater than
the minimum for that directive:
.PP
.Vb 1
\&  push @Redirect, "/foo", "http://www.foo.com/";
\&  
\&  push @Redirect, "/imdb", "http://www.imdb.com/";
\&  
\&  push @Redirect, [qw(temp "/here" "http://www.there.com")];
.Ve
.PP
Other section counterparts include \f(CW%VirtualHost\fR, \f(CW%Directory\fR and
\&\f(CW%Files\fR.
.PP
To pass all environment variables to the children with a single
configuration directive, rather than listing each one via \f(CW\*(C`PassEnv\*(C'\fR
or \f(CW\*(C`PerlPassEnv\*(C'\fR, a \f(CW\*(C`<Perl>\*(C'\fR section could read in a file and:
.PP
.Vb 1
\&  push @PerlPassEnv, [$key => $val];
.Ve
.PP
or
.PP
.Vb 1
\&  Apache2\->httpd_conf("PerlPassEnv $key $val");
.Ve
.PP
These are somewhat simple examples, but they should give you the basic
idea. You can mix in any Perl code you desire. See \fIeg/httpd.conf.pl\fR
and \fIeg/perl_sections.txt\fR in the mod_perl distribution for more
examples.
.PP
Assume that you have a cluster of machines with similar configurations
and only small distinctions between them: ideally you would want to
maintain a single configuration file, but because the configurations
aren't \fIexactly\fR the same (e.g. the \f(CW\*(C`ServerName\*(C'\fR directive) it's not
quite that simple.
.PP
\&\f(CW\*(C`<Perl>\*(C'\fR sections come to rescue. Now you have a single
configuration file and the full power of Perl to tweak the local
configuration. For example to solve the problem of the \f(CW\*(C`ServerName\*(C'\fR
directive you might have this \f(CW\*(C`<Perl>\*(C'\fR section:
.PP
.Vb 3
\&  <Perl>
\&  $ServerName = \`hostname\`;
\&  </Perl>
.Ve
.PP
For example if you want to allow personal directories on all machines
except the ones whose names start with \fIsecure\fR:
.PP
.Vb 9
\&  <Perl>
\&  $ServerName = \`hostname\`;
\&  if ($ServerName !~ /^secure/) {
\&      $UserDir = "public.html";
\&  }
\&  else {
\&      $UserDir = "DISABLED";
\&  }
\&  </Perl>
.Ve
.ie n .SH "@PerlConfig\fP and \f(CW$PerlConfig"
.el .SH "\f(CW@PerlConfig\fP and \f(CW$PerlConfig\fP"
.IX Header "@PerlConfig and $PerlConfig"
This array and scalar can be used to introduce literal configuration
into the apache configuration. For example:
.PP
.Vb 1
\&  push @PerlConfig, \*(AqAlias /foo /bar\*(Aq;
.Ve
.PP
Or:
  \f(CW$PerlConfig\fR .= \*(L"Alias /foo /bar\en\*(R";
.PP
See also
\&\f(CW\*(C`$r\->add_config\*(C'\fR
.SH "Configuration Variables"
.IX Header "Configuration Variables"
There are a few variables that can be set to change the default
behaviour of \f(CW\*(C`<Perl>\*(C'\fR sections.
.ie n .Sh "$Apache2::PerlSections::Save"
.el .Sh "\f(CW$Apache2::PerlSections::Save\fP"
.IX Subsection "$Apache2::PerlSections::Save"
Each \f(CW\*(C`<Perl>\*(C'\fR section is evaluated in its unique namespace,
by default residing in a sub-namespace of \f(CW\*(C`Apache2::ReadConfig::\*(C'\fR,
therefore any local variables will end up in that namespace. For
example if a \f(CW\*(C`<Perl>\*(C'\fR section happened to be in file
\&\fI/tmp/httpd.conf\fR starting on line 20, the namespace:
\&\f(CW\*(C`Apache2::ReadConfig::tmp::httpd_conf::line_20\*(C'\fR will be used. Now if
it had:
.PP
.Vb 5
\&  <Perl>
\&    $foo     = 5;
\&    my $bar  = 6;