plugins/perl/i-scream_users.pl

#!/usr/bin/perl -w

#-----------------------------------------------------------------
# i-scream host plugin - user information collection
#     $Author: tdb $
#     $Id: i-scream_users.pl,v 1.1 2001/11/19 21:42:11 tdb Exp $
#
# A short perl script to parse the output of the users command.
#-----------------------------------------------------------------


$| = 1;


# You'd be silly not to use this ;)
use strict;

# Get the OS type from the args, or try towork it out
my($ostype) = $ARGV[0];
$ostype = `uname -s` if not defined $ostype;
chomp($ostype);

# Decide which paths we should use.
my($usersbin);
if ($ostype eq "SunOS") {
    # covers: Solaris 7/8
    $usersbin = "/usr/ucb/users";
}
elsif ($ostype eq "Linux" || $ostype eq "FreeBSD") {
    # covers: Debian r2.2
    # covers: FreeBSD 4.X
    $usersbin = "/usr/bin/users";
}
else {
    print "i-scream_users.pl Error: Unable to identify system type - \"$ostype\".\n";
    print "\"uname -s\" does not report one of the following known types;\n";
    print "      SunOS, Linux, FreeBSD\n";
    exit(1);
}

# Run the following components: -
&include_users();

# End the program normally.
exit(0);


# sub to print pairs of data, separated by a single space character.
# If the second argument is undefined, then the pair is still printed,
# however, the value shall be displayed as the the 'default' value
# if the passed value was undefined.
sub print_pair($$$) {
    my($default, $name, $value) = @_;

    if (!defined $value) {
        $value = $default;
    }

    # Remove the trailing linefeed if we've not already done so.
    chomp($value);

    # print the pair of data with a space inbetween.
    print "$name $value\n";
}


# sub to find out the list of all usernames logged
# in to the machine and how many there are.
sub include_users() {

    # Find out all users on this machine.
    my($users) = `$usersbin`;
    $users = "\n" unless defined $users;
    chomp $users;
    my($users_count) = 0;
    $users_count++ while $users =~ /\w+/g;
    my($users_list) = $users." ";

    &print_pair(0, "packet.users.count", $users_count);
    &print_pair("unknown", "packet.users.list", $users_list);
}
Revision:	1.2
Committed:	Tue Dec 18 04:07:17 2001 UTC (23 years, 10 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+6 -12 lines
Log Message:	Solaris process accounting made me notice the number of times `uname` was being called. It was way over the top, especially as it's unlikely to change during an invocation of ihost :) Before it was run by each plugin every time they were run - in total 50 times a minute :/ Now, it's run once by ihost at startup, and that's it. The value read at startup is passed as a command line argument to each plugin. The plugins can fallback on working out the ostype using `uname` if they don't get given one on the command line.
#	User	Rev	Content
1	tdb	1.1	#!/usr/bin/perl -w
2
3			#-----------------------------------------------------------------
4			# i-scream host plugin - user information collection
5	tdb	1.2	# $Author: tdb $
6			# $Id: i-scream_users.pl,v 1.1 2001/11/19 21:42:11 tdb Exp $
7	tdb	1.1	#
8			# A short perl script to parse the output of the users command.
9			#-----------------------------------------------------------------
10
11
12			$\| = 1;
13
14
15			# You'd be silly not to use this ;)
16			use strict;
17
18	tdb	1.2	# Get the OS type from the args, or try towork it out
19			my($ostype) = $ARGV[0];
20			$ostype = `uname -s` if not defined $ostype;
21			chomp($ostype);
22	tdb	1.1
23			# Decide which paths we should use.
24			my($usersbin);
25			if ($ostype eq "SunOS") {
26			# covers: Solaris 7/8
27			$usersbin = "/usr/ucb/users";
28			}
29			elsif ($ostype eq "Linux" \|\| $ostype eq "FreeBSD") {
30			# covers: Debian r2.2
31			# covers: FreeBSD 4.X
32			$usersbin = "/usr/bin/users";
33			}
34			else {
35			print "i-scream_users.pl Error: Unable to identify system type - \"$ostype\".\n";
36			print "\"uname -s\" does not report one of the following known types;\n";
37			print " SunOS, Linux, FreeBSD\n";
38			exit(1);
39			}
40
41			# Run the following components: -
42			&include_users();
43
44			# End the program normally.
45			exit(0);
46
47
48
49
50			# sub to print pairs of data, separated by a single space character.
51			# If the second argument is undefined, then the pair is still printed,
52			# however, the value shall be displayed as the the 'default' value
53			# if the passed value was undefined.
54			sub print_pair($$$) {
55			my($default, $name, $value) = @_;
56
57			if (!defined $value) {
58			$value = $default;
59			}
60
61			# Remove the trailing linefeed if we've not already done so.
62			chomp($value);
63
64			# print the pair of data with a space inbetween.
65			print "$name $value\n";
66			}
67
68
69			# sub to find out the list of all usernames logged
70			# in to the machine and how many there are.
71			sub include_users() {
72
73			# Find out all users on this machine.
74			my($users) = `$usersbin`;
75			$users = "\n" unless defined $users;
76			chomp $users;
77			my($users_count) = 0;
78			$users_count++ while $users =~ /\w+/g;
79			my($users_list) = $users." ";
80
81			&print_pair(0, "packet.users.count", $users_count);
82			&print_pair("unknown", "packet.users.list", $users_list);
83			}