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

App::Info::HTTPD::Apache(3pm) User Contributed Perl Documentation App::Info::HTTPD::Apache(3pm)

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 "glob"bed from the file system.

SUPPORT

This module is stored in an open GitHub repository <http://github.com/theory/app-info/>. Feel free to fork and contribute!
Please file bug reports via GitHub Issues <http://github.com/theory/app-info/issues/> or by sending mail to bug-App-Info@rt.cpan.org <mailto: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 (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.
2015-06-06 perl v5.20.2