David E. Wheeler > App-Info-0.57 > App::Info::HTTPD::Apache

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Module Version: 0.57   Source  

NAME ^

App::Info::HTTPD::Apache - Information about Apache web server

SYNOPSIS ^

  use App::Info::HTTPD::Apache;

  my $apache = App::Info::HTTPD::Apache->new;

  if ($apache->installed) {
      print "App name: ", $apache->name, "\n";
      print "Version:  ", $apache->version, "\n";
      print "Bin dir:  ", $apache->bin_dir, "\n";
  } else {
      print "Apache is not installed. :-(\n";
  }

DESCRIPTION ^

App::Info::HTTPD::Apache supplies information about the Apache web server installed on the local system. It implements all of the methods defined by App::Info::HTTPD. Methods that trigger events will trigger them only the first time they're called (See App::Info for documentation on handling events). To start over (after, say, someone has installed Apache) construct a new App::Info::HTTPD::Apache object to aggregate new meta data.

Some of the methods trigger the same events. This is due to cross-calling of methods or of functions common to methods. However, any one event should be triggered no more than once. For example, although the info event "Executing `httpd -v`" is documented for the methods name(), version(), major_version(), minor_version(), and patch_version(), rest assured that it will only be triggered once, by whichever of those four methods is called first.

INTERFACE ^

Constructor

new

  my $apache = App::Info::HTTPD::Apache->new(@params);

Returns an App::Info::HTTPD::Apache object. See App::Info for a complete description of argument parameters.

When called, new() searches the the directories returned by search_bin_dirs() for an executable with a name returned by search_exe_names(). If found, the executable (hereafter referred to as httpd, regardless of how it was actually found to be named) will be called by the object methods below to gather the data necessary for each. If httpd cannot be found, then Apache is assumed not to be installed, and each of the object methods will return undef.

In addition to the parameters supported by the parent classes, App::Info and App::Info::HTTPD, this class' new() method also supports:

search_conf_names

An array reference of possible names for Apache configuration files. These will be returned by the search_conf_names() method before the default names, and may be used by conf_file() to search for the configuration file.

search_conf_dirs

An array reference of possible directories in which to search for Apache configuration files. These will be returned by the search_conf_dirs() method before the default directories, and may be used by conf_file() to search for the configuration file.

As well as these parameters to specify alternate names for Apache executables (other than httpd, which you specify via the search_exe_names parameter):

search_ab_names
search_apachectl_names
search_apxs_names
search_htdigest_names
search_htpasswd_names
search_logresolve_names
search_rotatelogs_names

Events:

info

Looking for Apache executable

confirm

Path to your httpd executable?

unknown

Path to your httpd executable?

Class Method

key_name

  my $key_name = App::Info::HTTPD::Apache->key_name;

Returns the unique key name that describes this class. The value returned is the string "Apache".

Object Methods

installed

  print "apache is ", ($apache->installed ? '' : 'not '),
    "installed.\n";

Returns true if Apache is installed, and false if it is not. App::Info::HTTPD::Apache determines whether Apache is installed based on the presence or absence of the httpd application on the file system, as found when new() constructed the object. If Apache does not appear to be installed, then all of the other object methods will return empty values.

name

  my $name = $apache->name;

Returns the name of the application. App::Info::HTTPD::Apache parses the name from the system call `httpd -v`.

Events:

info

Executing `httpd -v`

error

Failed to find Apache version data with `httpd -v`

Failed to parse Apache name and version from string

unknown

Enter a valid Apache name

version

  my $version = $apache->version;

Returns the apache version number. App::Info::HTTPD::Apache parses the version number from the system call `httpd -v`.

Events:

info

Executing `httpd -v`

error

Failed to find Apache version data with `httpd -v`

Failed to parse Apache name and version from string

unknown

Enter a valid Apache version number

major_version

  my $major_version = $apache->major_version;

Returns the Apache major version number. App::Info::HTTPD::Apache parses the version number from the system call `httpd --v`. For example, if version() returns "1.3.24", then this method returns "1".

Events:

info

Executing `httpd -v`

error

Failed to find Apache version data with `httpd -v`

Failed to parse Apache name and version from string

unknown

Enter a valid Apache major version number

minor_version

  my $minor_version = $apache->minor_version;

Returns the Apache minor version number. App::Info::HTTPD::Apache parses the version number from the system call `httpd --v`. For example, if version() returns "1.3.24", then this method returns "3". See the version method for a list of possible errors.

Events:

info

Executing `httpd -v`

error

Failed to find Apache version data with `httpd -v`

Failed to parse Apache name and version from string

unknown

Enter a valid Apache minor version number

patch_version

  my $patch_version = $apache->patch_version;

Returns the Apache patch version number. App::Info::HTTPD::Apache parses the version number from the system call `httpd --v`. For example, if version() returns "1.3.24", then this method returns "24".

Events:

info

Executing `httpd -v`

error

Failed to find Apache version data with `httpd -v`

Failed to parse Apache name and version from string

unknown

Enter a valid Apache patch version number

httpd_root

  my $httpd_root = $apache->httpd_root;

Returns the HTTPD root directory path. This path is defined at compile time, and App::Info::HTTPD::Apache parses it from the system call `httpd -V`.

Events:

info

Executing `httpd -V`

error

Unable to extract compile settings from `httpd -V`

Cannot parse HTTPD root from `httpd -V`

unknown

Enter a valid HTTPD root

magic_number

  my $magic_number = $apache->magic_number;

Returns the "Magic Number" for the Apache installation. This number is defined at compile time, and App::Info::HTTPD::Apache parses it from the system call `httpd -V`.

Events:

info

Executing `httpd -V`

error

Unable to extract compile settings from `httpd -V`

Cannot parse HTTPD root from `httpd -V`

unknown

Enter a valid magic number

compile_option

  my $compile_option = $apache->compile_option($option);

Returns the value of the Apache compile option $option. The compile option is looked up case-insensitively. All of the Apache compile options are collected from the system call `httpd -V`. For compile options that contain a corresponding value (such as "SUEXEC_BIN" or "DEFAULT_PIDLOG"), compile_option() returns the value of the option if the option exists. For other options, it returns true (1) if the option was included, and false(undef) if it was not. Returns undef if Apache is not installed or if the option could not be parsed. See the httpd_root method for a list of possible errors.

See the Apache documentation at http://httpd.apache.org/docs-project/ to learn about all the possible compile options.

Events:

info

Executing `httpd -V`

error

Unable to extract compile settings from `httpd -V`

Cannot parse HTTPD root from `httpd -V`

unknown

Enter a valid option

conf_file

Returns the full path to the Apache configuration file. conf_file() looks for the configuration file in a number of locations and under a number of names. First it tries to use the file specified by the SERVER_CONFIG_FILE compile option (as returned by a call to compile_option()) -- and if it's a relative file name, it gets appended to the directory returned by httpd_root(). If that file isn't found, conf_file() then looks for a file with one of the names returned by search_conf_names() in the conf subdirectory of the HTTPD root directory. Failing that, it searches for them in each of the directories returned by search_conf_dirs() until it finds a match.

Events:

info

Searching for Apache configuration file

error

No Apache config file found

unknown

Location of httpd.conf file?

user

  my $user = $apache->user;

Returns the name of the Apache user. This value is collected from the Apache configuration file as returned by conf_file().

Events:

info

Searching for Apache configuration file

Executing `httpd -V`

Parsing Apache configuration file

error

No Apache config file found

Cannot parse user from file

Cannot parse group from file

Cannot parse port from file

Cannot parse DocumentRoot from file

unknown

Location of httpd.conf file?

Enter Apache user name

group

Returns the name of the Apache user group. This value is collected from the Apache configuration file as returned by conf_file().

Events:

info

Searching for Apache configuration file

Executing `httpd -V`

Parsing Apache configuration file

error

No Apache config file found

Cannot parse user from file

Cannot parse group from file

Cannot parse port from file

Cannot parse DocumentRoot from file

unknown

Location of httpd.conf file?

Enter Apache user group name

port

Returns the port number on which Apache listens. This value is collected from Apache configuration file as returned by conf_file().

Events:

info

Searching for Apache configuration file

Executing `httpd -V`

Parsing Apache configuration file

error

No Apache config file found

Cannot parse user from file

Cannot parse group from file

Cannot parse port from file

Cannot parse DocumentRoot from file

unknown

Location of httpd.conf file?

Enter Apache TCP/IP port number

doc_root

Returns the local physical path where web pages are stored. This value is collected from Apache configuration file as returned by conf_file().

Events:

info

Searching for Apache configuration file

Executing `httpd -V`

Parsing Apache configuration file

error

No Apache config file found

Cannot parse user from file

Cannot parse group from file

Cannot parse port from file

Cannot parse DocumentRoot from file

unknown

Location of httpd.conf file?

Enter DocumentRoot actual directory

cgibin_virtual

Returns the virtual path where cgi-bin programs are stored. This value is collected from Apache configuration file as returned by conf_file().

Events:

info

Searching for Apache configuration file

Executing `httpd -V`

Parsing Apache configuration file

error

No Apache config file found

Cannot parse user from file

Cannot parse group from file

Cannot parse port from file

Cannot parse ScriptAlias from file

unknown

Location of httpd.conf file?

Enter ScriptAlias virtual directory

cgibin_physical

Returns the physical path where cgi-bin programs are stored. This value is collected from Apache configuration file as returned by conf_file().

Events:

info

Searching for Apache configuration file

Executing `httpd -V`

Parsing Apache configuration file

error

No Apache config file found

Cannot parse user from file

Cannot parse group from file

Cannot parse port from file

Cannot parse ScriptAlias from file

unknown

Location of httpd.conf file?

Enter ScriptAlias physical directory

executable

  my $executable = $apache->executable;

Returns the path to the Apache executable, which will be defined by one of the names returned by search_exe_names(). The executable is searched for in new(), so there are no events for this method.

httpd

  my $httpd = $apache->httpd;

An alias for executable().

bin_dir

  my $bin_dir = $apache->bin_dir;

Returns the SQLite binary directory path. App::Info::HTTPD::Apache simply retrieves it as the directory part of the path to the HTTPD executable.

inc_dir

  my $inc_dir = $apache->inc_dir;

Returns the Apache include directory path. App::Info::HTTPD::Apache simply looks for the include or inc directory under the httpd_root directory, as returned by httpd_root().

Events:

info

Executing `httpd -V`

Searching for include directory

error

Unable to extract compile settings from `httpd -V`

Cannot parse HTTPD root from `httpd -V`

Cannot find include directory

unknown

Enter a valid HTTPD root

Enter a valid Apache include directory

lib_dir

  my $lib_dir = $apache->lib_dir;

Returns the Apache library directory path. App::Info::HTTPD::Apache simply looks for the lib, modules, or libexec directory under the HTTPD root> directory, as returned by httpd_root().

Events:

info

Executing `httpd -V`

Searching for library directory

error

Unable to extract compile settings from `httpd -V`

Cannot parse HTTPD root from `httpd -V`

Cannot find library directory

unknown

Enter a valid HTTPD root

Enter a valid Apache library directory

so_lib_dir

  my $so_lib_dir = $apache->so_lib_dir;

Returns the Apache shared object library directory path. Currently, this directory is assumed to be the same as the lib directory, so this method is simply an alias for lib_dir.

Events:

info

Executing `httpd -V`

Searching for library directory

error

Unable to extract compile settings from `httpd -V`

Cannot parse HTTPD root from `httpd -V`

Cannot find library directory

unknown

Enter a valid HTTPD root

Enter a valid Apache library directory

static_mods

Returns a list (in an array context) or an anonymous array (in a scalar context) of all of the modules statically compiled into Apache. These are collected from the system call `httpd -l`. If Apache is not installed, static_mods() returns an empty list in an array context or an empty anonymous array in a scalar context.

Events:

info

Executing `httpd -l`

error

Unable to extract needed data from `httpd -l`

shared_mods

Returns a list (in an array context) or an anonymous array (in a scalar context) of all of the shared modules compiled for Apache. These are collected by searching for all files ending in .so in the directory returned from the system call `apxs -q LIBEXECDIR`. If Apache is not installed, shared_mods() returns an empty list in an array context or an empty anonymous array in a scalar context.

Events:

info

Looking for apxs

Executing `apxs -q LIBEXECDIR`

error

Unable to extract module directory name from `apxs -q LIBEXECDIR`

mod_so

Boolean method that returns true when mod_so has been compiled into Apache, and false if it has not. The presence or absence of mod_so is determined by the system call `httpd -l`.

Events:

info

Executing `httpd -l`

error

Unable to extract needed data from `httpd -l`

mod_perl

Boolean method that returns true when mod_perl has been statically compiled into Apache, and false if it has not. The presence or absence of mod_perl is determined by the system call `httpd -l` or, for a dynamic mod_perl, by the contents of the directory returned by the system call `apxs -q LIBEXECDIR`.

Events:

info

Executing `httpd -l`

Looking for apxs

Executing `apxs -q LIBEXECDIR`

error

Unable to extract needed data from `httpd -l`

home_url

  my $home_url = $apache->home_url;

Returns the Apache home page URL.

download_url

  my $download_url = $apache->download_url;

Returns the Apache download URL.

search_exe_names

  my @search_exe_names = $apache->search_exe_names;

Returns a list of possible names for the Apache executable; .exe is appended to each on Win32. By default, the names are:

httpd
httpd2
apache-perl
apache
apache2

search_bin_dirs

  my @search_bin_dirs = $apache->search_bin_dirs;

Returns a list of possible directories in which to search an executable. Used by the new() constructor to find an executable to execute and collect application info. The found directory will also be returned by the bin_dir method.

The list of directories by default consists of the path as defined by File::Spec->path and the value returned by Apache2::BuildConfig->new->{APXS_BINDIR} (if Apache2::BuildConfig is installed), as well as the following directories:

/usr/local/apache/bin
/usr/local/apache2/bin
/opt/apache/bin
/opt/apache2/bin
/usr/local/bin
/usr/local/sbin
/usr/bin
/usr/sbin
/bin
/etc/httpd/bin
/etc/apache/bin
/etc/apache2/bin
/home/httpd/bin
/home/apache/bin
/home/apache2/bin
/sw/bin
/sw/sbin
/web/httpd

search_lib_dirs

  my @search_lib_dirs = $apache->search_lib_dirs;

Returns a list of possible directories in which to search for Apache libraries. By default, it returns this list of directories, each appended to the name of the directory returned by httpd_root():

lib
modules
libexec

search_inc_dirs

  my @search_inc_dirs = $apache->search_inc_dirs;

Returns a list of possible directories in which to search for Apache include files. By default, it returns this list of directories, each appended to the name of the directory returned by httpd_root():

include
inc

search_conf_names

  my @search_conf_dirs = $apache->search_conf_dirs;

Returns a list of possible names for Apache configuration files. These will be used bye the conf_file() method to search for Apache configuration files. By Default, the possible configuration file names are:

httpd.conf
httpd.conf.default

search_conf_dirs

  my @search_conf_dirs = $apache->search_conf_dirs;

Returns a list of directories in which the conf_file() method will search for Apache configuration files.

/usr/share/doc/apache-perl
/etc/httpd

Other Executable Methods

These methods return the complete paths to their like-named executables. Apache comes with a fair number of them; we provide these methods to provide a path to a subset of them. Each method, when called, checks for an executable in the directory returned by bin_dir(). The name of the executable must be one of the names returned by the corresponding search_*_names method.

The available executable methods are:

ab
apachectl
apxs
htdigest
htpasswd
logresolve
rotatelogs

And the corresponding search names methods are:

search_ab_names
search_apachectl_names
search_apxs_names
search_htdigest_names
search_htpasswd_names
search_logresolve_names
search_rotatelogs_names

Events:

info

Looking for executable

confirm

Path to executable?

unknown

Path to executable?

KNOWN ISSUES ^

It's likely that a lot more can be done to collect data about Apache. The methodology for determining the lib, inc, bin, and so_lib directories in particular may be considered rather weak. And the Port number can be specified multiple ways (and times!) in an Apache configuration file. Patches from those who know a great deal more about interrogating Apache will be most welcome.

TO DO ^

Add method to return the names of available DSOs. These should either be parsed from the httpd.conf file or globbed from the file system.

SUPPORT ^

This module is stored in an open GitHub repository. Feel free to fork and contribute!

Please file bug reports via GitHub Issues or by sending mail to bug-App-Info@rt.cpan.org.

AUTHOR ^

David E. Wheeler <david@justatheory.com> based on code by Sam Tregar <sam@tregar.com>.

SEE ALSO ^

App::Info documents the event handling interface.

App::Info::HTTPD is the App::Info::HTTP::Apache parent class.

Apache and mod_perl_mod_perl document mod_perl.

http://httpd.apache.org/ is the Apache web server home page.

http://perl.apache.org/ is the mod_perl home page.

COPYRIGHT AND LICENSE ^

Copyright (c) 2002-2011, David E. Wheeler. Some Rights Reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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