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path: root/lib/Apache/Defaults.pm
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package Apache::Defaults;
use strict;
use warnings;
use File::Spec;
use IPC::Open3;
use Shell::GetEnv;
use DateTime::Format::Strptime;
use Symbol 'gensym';
use Carp;

our $VERSION = '0.10';

sub new {
    my $class = shift;
    my $self = bless {}, $class;
    local %_ = @_;
    my $v;
    my @servlist;
    if ($v = delete $_{server}) {
	if (ref($v) eq 'ARRAY') {
	    @servlist = @$v;
	} else {
	    @servlist = ( $v );
	}
    } else {
	@servlist = qw(/usr/sbin/httpd /usr/sbin/apache2);
    }
    
    if (my @select = grep { -x $_ } @servlist) {
	$self->{server} = shift @select;
    } else {
	croak "No suitable httpd binary found";
    }

    if ($v = delete $_{environ}) {
	$self->{environ} = Shell::GetEnv->new('sh', ". $v", startup => 0)
	                                ->envs;
    }

    croak "unrecognized arguments" if keys(%_);
    return $self;
}	    

sub server { shift->{server} }
sub environ { shift->{environ} }

sub probe {
    my ($self, $cb, @opt) = @_;

    open(my $nullout, '>', File::Spec->devnull);
    open(my $nullin, '<', File::Spec->devnull);

    my $fd = gensym;
    local %ENV = %{$self->{environ}} if $self->{environ};
    if (my $pid = open3($nullin, $fd, $nullout, $self->server, @opt)) {
	while (<$fd>) {
	    chomp;
	    last unless &{$cb}($_);
	}
    }
    close $fd;
    close $nullin;
    close $nullout;
}    

sub dequote {
    my ($self, $arg) = @_;
    if ($arg =~ s{^"(.*?)"$}{$1}) {
	$arg =~ s{\\([\\"])}{$1}g;
    }
    return $arg;
}

sub _get_version_info {
    my $self = shift;
    unless ($self->{has_version_info}) {
	$self->probe(sub {
	    local $_ = shift;
	    if (m{^Server version:\s+(.+?)/(\S+)\s+\((.*?)\)}) {
		$self->{name} = $1;
		$self->{version} = $2;
		$self->{platform} = $3;
	    } elsif (/^Server built:\s+(.+)/) {
		$self->{built} =
		    DateTime::Format::Strptime->new(
			pattern => '%b %d %Y %H:%M%S',
			strict => 1,
			locale => 'en_US',
			time_zone => 'UTC',
			on_error => 'undef'
		    )->parse_datetime($1);
			
	    } elsif (/^Server loaded:\s+(.+)$/) {
		$self->{loaded_with} = $1;
	    } elsif (/^Compiled using:\s+(.+)$/) {
		$self->{compiled_with} = $1;
	    } elsif (/^Architecture:\s+(.+)$/) {
		$self->{architecture} = $1;
	    } elsif (/^Server MPM:\s+(.+)$/) {
		$self->{MPM} = $1;
            } elsif (/^\s+threaded:\s+(?<b>yes|no)/) {
		$self->{MPM_threaded} = $+{b} eq 'yes';
	    } elsif (/^\s+forked:\s+(?<b>yes|no)/) {
		$self->{MPM_forked} = $+{b} eq 'yes';
	    } elsif (/^\s+-D\s+(?<name>.+?)=(?<val>.+)$/) {
		$self->{defines}{$+{name}} = $self->dequote($+{val});
	    } elsif (/^\s+-D\s+(?<name>.+?)(?:\s*(?<com>.+))?$/) {
		$self->{defines}{$+{name}} = 1;
	    }
	    return 1;
        }, '-V');
    }
    $self->{has_version_info} = 1;
}

my @ATTRIBUTES = qw(name
                    version
                    platform
                    built
                    loaded_with
                    compiled_with
                    architecture
                    MPM
                    MPM_threaded
                    MPM_forked);
{
    no strict 'refs';
    foreach my $attribute (@ATTRIBUTES) {
	*{ __PACKAGE__ . '::' . $attribute } = sub {
	    my $self = shift;
	    $self->_get_version_info;
	    $self->{$attribute};
	}
    }
}

sub server_root { shift->defines('HTTPD_ROOT') }

sub defines {
    my $self = shift;
    $self->_get_version_info;
    return @{$self->{defines}}{@_};
}

# List of module sources and corresponding identifiers, obtained from the
# httpd-2.4.6 source.
my %modlist = (
    'event.c' => 'mpm_event_module',
    'prefork.c' => 'mpm_prefork_module',
    'worker.c' => 'mpm_worker_module',
    'mod_access_compat.c' => 'access_compat_module',
    'mod_actions.c' => 'actions_module',
    'mod_alias.c' => 'alias_module',
    'mod_allowmethods.c' => 'allowmethods_module',
    'mod_asis.c' => 'asis_module',
    'mod_auth_basic.c' => 'auth_basic_module',
    'mod_auth_digest.c' => 'auth_digest_module',
    'mod_auth_form.c' => 'auth_form_module',
    'mod_authn_anon.c' => 'authn_anon_module',
    'mod_authn_core.c' => 'authn_core_module',
    'mod_authn_dbd.c' => 'authn_dbd_module',
    'mod_authn_dbm.c' => 'authn_dbm_module',
    'mod_authn_file.c' => 'authn_file_module',
    'mod_authn_socache.c' => 'authn_socache_module',
    'mod_authnz_ldap.c' => 'authnz_ldap_module',
    'mod_authz_core.c' => 'authz_core_module',
    'mod_authz_dbd.c' => 'authz_dbd_module',
    'mod_authz_dbm.c' => 'authz_dbm_module',
    'mod_authz_groupfile.c' => 'authz_groupfile_module',
    'mod_authz_host.c' => 'authz_host_module',
    'mod_authz_owner.c' => 'authz_owner_module',
    'mod_authz_user.c' => 'authz_user_module',
    'mod_autoindex.c' => 'autoindex_module',
    'mod_buffer.c' => 'buffer_module',
    'mod_cache.c' => 'cache_module',
    'mod_cache_disk.c' => 'cache_disk_module',
    'mod_cache_socache.c' => 'cache_socache_module',
    'mod_cern_meta.c' => 'cern_meta_module',
    'mod_cgi.c' => 'cgi_module',
    'mod_cgid.c' => 'cgid_module',
    'mod_charset_lite.c' => 'charset_lite_module',
    'mod_data.c' => 'data_module',
    'mod_dav.c' => 'dav_module',
    'mod_dav_fs.c' => 'dav_fs_module',
    'mod_dav_lock.c' => 'dav_lock_module',
    'mod_dbd.c' => 'dbd_module',
    'mod_deflate.c' => 'deflate_module',
    'mod_dialup.c' => 'dialup_module',
    'mod_dir.c' => 'dir_module',
    'mod_dumpio.c' => 'dumpio_module',
    'mod_echo.c' => 'echo_module',
    'mod_env.c' => 'env_module',
    'mod_example.c' => 'example_module',
    'mod_expires.c' => 'expires_module',
    'mod_ext_filter.c' => 'ext_filter_module',
    'mod_file_cache.c' => 'file_cache_module',
    'mod_filter.c' => 'filter_module',
    'mod_headers.c' => 'headers_module',
    'mod_heartbeat' => 'heartbeat_module',
    'mod_heartmonitor.c' => 'heartmonitor_module',
    'mod_ident.c' => 'ident_module',
    'mod_imagemap.c' => 'imagemap_module',
    'mod_include.c' => 'include_module',
    'mod_info.c' => 'info_module',
    'mod_isapi.c' => 'isapi_module',
    'mod_lbmethod_bybusyness.c' => 'lbmethod_bybusyness_module',
    'mod_lbmethod_byrequests.c' => 'lbmethod_byrequests_module',
    'mod_lbmethod_bytraffic.c' => 'lbmethod_bytraffic_module',
    'mod_lbmethod_heartbeat.c' => 'lbmethod_heartbeat_module',
    'util_ldap.c' => 'ldap_module',
    'mod_log_config.c' => 'log_config_module',
    'mod_log_debug.c' => 'log_debug_module',
    'mod_log_forensic.c' => 'log_forensic_module',
    'mod_logio.c' => 'logio_module',
    'mod_lua.c' => 'lua_module',
    'mod_macro.c' => 'macro_module',
    'mod_mime.c' => 'mime_module',
    'mod_mime_magic.c' => 'mime_magic_module',
    'mod_negotiation.c' => 'negotiation_module',
    'mod_nw_ssl.c' => 'nwssl_module',
    'mod_privileges.c' => 'privileges_module',
    'mod_proxy.c' => 'proxy_module',
    'mod_proxy_ajp.c' => 'proxy_ajp_module',
    'mod_proxy_balancer.c' => 'proxy_balancer_module',
    'mod_proxy_connect.c' => 'proxy_connect_module',
    'mod_proxy_express.c' => 'proxy_express_module',
    'mod_proxy_fcgi.c' => 'proxy_fcgi_module',
    'mod_proxy_fdpass.c' => 'proxy_fdpass_module',
    'mod_proxy_ftp.c' => 'proxy_ftp_module',
    'mod_proxy_html.c' => 'proxy_html_module',
    'mod_proxy_http.c' => 'proxy_http_module',
    'mod_proxy_scgi.c' => 'proxy_scgi_module',
    'mod_proxy_wstunnel.c' => 'proxy_wstunnel_module',
    'mod_ratelimit.c' => 'ratelimit_module',
    'mod_reflector.c' => 'reflector_module',
    'mod_remoteip.c' => 'remoteip_module',
    'mod_reqtimeout.c' => 'reqtimeout_module',
    'mod_request.c' => 'request_module',
    'mod_rewrite.c' => 'rewrite_module',
    'mod_sed.c' => 'sed_module',
    'mod_session.c' => 'session_module',
    'mod_session_cookie.c' => 'session_cookie_module',
    'mod_session_crypto.c' => 'session_crypto_module',
    'mod_session_dbd.c' => 'session_dbd_module',
    'mod_setenvif.c' => 'setenvif_module',
    'mod_slotmem_plain.c' => 'slotmem_plain_module',
    'mod_slotmem_shm.c' => 'slotmem_shm_module',
    'mod_so.c' => 'so_module',
    'mod_socache_dbm.c' => 'socache_dbm_module',
    'mod_socache_dc.c' => 'socache_dc_module',
    'mod_socache_memcache.c' => 'socache_memcache_module',
    'mod_socache_shmcb.c' => 'socache_shmcb_module',
    'mod_speling.c' => 'speling_module',
    'mod_ssl.c' => 'ssl_module',
    'mod_status.c' => 'status_module',
    'mod_substitute.c' => 'substitute_module',
    'mod_suexec.c' => 'suexec_module',
    'mod_unique_id.c' => 'unique_id_module',
    'mod_unixd.c' => 'unixd_module',
    'mod_userdir.c' => 'userdir_module',
    'mod_usertrack.c' => 'usertrack_module',
    'mod_version.c' => 'version_module',
    'mod_vhost_alias.c' => 'vhost_alias_module',
    'mod_watchdog.c' => 'watchdog_module',
    'mod_xml2enc.c' => 'xml2enc_module'
);

sub preloaded {
    my $self = shift;
    $self->_get_module_info;
    if (@_) {
	return @{$self->{preloaded}}{@_};
    }
    return keys %{$self->{preloaded}};
}

sub _get_module_info {
    my $self = shift;
    unless ($self->{has_module_info}) {
	$self->probe(sub {
	                    local $_ = shift;
#			    print "GOT $_\n";
			    if (/^\s*(\S+\.c)$/ && exists($modlist{$1})) {
				$self->{preloaded}{$modlist{$1}} = $1;
			    }
			    return 1;
		     }, '-l');
	$self->{has_module_info} = 1;
    }
}

1;

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