I need a perl script to stop and start program

['chris']

hi

I need a perl script to stop and start program:

-------------------------------------------------------
# stop PROGRAM

sh /home/ntop.sh stop


# start PROGRAM

sh /home/ntop.sh start
-------------------------------------------------------

I'd like first stop the program and start it again using apache & browser.

kind regards
chris

[A. Clay Stephenson · Accepted solution]

perl -e '$cc = system("/home/ntop.sh start"); exit($cc);'

I trust you can figure out the stop program.

['chris']

thanks,

I've written following perl script:

----------------------------------------------------------
#!/usr/bin/perl -w

use CGI::Carp qw(fatalsToBrowser);
use CGI;
my $query = new CGI;

$bb = system("/home/ntop.sh stop &");

exit($bb);

$cc = system("/home/ntop.sh start &");

exit($cc);
----------------------------------------------------------


if execute it from command line:

# perl ntop.cgi

then ntop starts,

but via browser, script be executed without errors, but ntop won't start.


# chown www ntop.cgi

doesn't help !

kind regards
chris

[A. Clay Stephenson]

#!/usr/bin/perl -w

use CGI::Carp qw(fatalsToBrowser);
use CGI;
my $query = new CGI;

$bb = system("/home/ntop.sh stop &");

exit($bb); #### This exit terminate the program!!! Nothing past this point is done

$cc = system("/home/ntop.sh start &");

exit($cc);
-----------------------------------------

You made thimgs complicated using the & to stop in background.

Change to this:

#!/usr/bin/perl -w

use CGI::Carp qw(fatalsToBrowser);
use CGI;
my $query = new CGI;

my $bb = system("/home/ntop.sh stop");
sleep(10);
$cc = system("/home/ntop.sh start &");
exit($cc);

or this:
#!/usr/bin/perl -w

use CGI::Carp qw(fatalsToBrowser);
use CGI;
my $query = new CGI;

my $bb = system("/home/ntop.sh stop &");
wait; # wait for background task to finish
$cc = system("/home/ntop.sh start &");
exit($cc);

['chris']

thanks,
---------------------------------------------------------------------------------------
#!/usr/bin/perl -w

use CGI::Carp qw(fatalsToBrowser);
use CGI;
my $query = new CGI;

print $query->header;
print "\n";
print "\n";
print "\n";
print "\n";
print "\n";
print "\n";
print "";
print "";
print "";

my $bb = system("/home/ntop.sh stop");
sleep(5);
$cc = system("/home/ntop.sh start &");

print "";
print "";

exit($cc);
---------------------------------------------------------------------------------------

it works excellent from command line,
but it it doesn't start ntop via browser.

what's wrong ?

[A. Clay Stephenson]

Add a
print "Status: ",$cc,"\n";

After the system call. You should at least then see the exit status. I suspect you are missing environment variables or ntop expects a tty device as stdin. Put probes that write to a file in your ntop.sh script.

['chris']

I get the output:

Status: 0 ntop

I think the www user has no rights
to execute "system" via browser,
because I have in the Apache error log:

[Thu Jul 21 23:43:54 2005] [error] [client 192.168.0.105] Permission denied

do you know howto change that ?

[A. Clay Stephenson]

Do something like "ls -l /etc" inside your system command as a test.

['chris']

# ls -l /etc
total 602
-rw-r--r-- 1 root wheel 32 Jul 19 12:55 .directory
drwxr-xr-x 3 root wheel 512 Jul 18 22:54 .java
drwxr-xr-x 2 root wheel 512 Jul 20 23:02 X11
lrwxrwxrwx 1 root wheel 12 Jul 15 23:38 aliases -> mail/aliases
-rw-r--r-- 1 root wheel 65536 Jul 18 19:04 aliases.db
-rw-r--r-- 1 root wheel 209 May 8 09:05 amd.map
-rw-r--r-- 1 root wheel 1234 May 8 09:05 apmd.conf
-rw-r--r-- 1 root wheel 231 May 8 09:05 auth.conf
drwxr-xr-x 2 root wheel 512 Jul 15 23:38 bluetooth
-rw-r--r-- 1 root wheel 737 May 8 09:05 crontab
-rw-r--r-- 1 root wheel 108 May 8 09:05 csh.cshrc
-rw-r--r-- 1 root wheel 481 May 8 09:05 csh.login
-rw-r--r-- 1 root wheel 110 May 8 09:05 csh.logout
drwxr-xr-x 2 root wheel 512 Jul 15 23:38 defaults
-rw-r--r-- 1 root wheel 4846 May 8 09:05 devd.conf
-rw-r--r-- 1 root wheel 2071 May 8 09:05 devfs.conf
-rw-r--r-- 1 root wheel 267 May 8 09:05 dhclient.conf
-rw-r--r-- 1 root wheel 6621 May 8 09:05 disktab
-rw-rw-r-- 1 root operator 0 May 8 09:05 dumpdates
-rw-r--r-- 1 root wheel 142 May 8 09:05 fbtab
-rw-r--r-- 1 root wheel 391 Jul 15 23:50 fstab
-rw-r--r-- 1 root wheel 245 May 8 09:05 ftpusers
-rw-r--r-- 1 root wheel 5904 May 8 09:05 gettytab
drwxr-xr-x 2 root wheel 512 Jul 15 23:38 gnats
-rw-r--r-- 1 root wheel 489 Jul 16 15:09 group
-rw-r--r-- 1 root wheel 60 Jul 15 22:29 host.conf
-rw-r--r-- 1 root wheel 146 Jul 20 21:25 hosts
-rw-r--r-- 1 root wheel 3237 Jul 21 01:39 hosts.allow
-rw-r--r-- 1 root wheel 111 May 8 09:05 hosts.equiv
-rw-r--r-- 1 root wheel 99 May 8 09:05 hosts.lpd
-rw-r--r-- 1 root wheel 5319 May 8 09:05 inetd.conf
drwx------ 2 root wheel 512 Jul 15 23:38 isdn
-rw-r--r-- 1 root wheel 837 May 8 09:03 localtime
-rw-r--r-- 1 root wheel 619 May 8 09:05 locate.rc
-rw-r--r-- 1 root wheel 1847 May 8 09:05 login.access
-rw-r--r-- 1 root wheel 6522 May 8 09:05 login.conf
-rw-r--r-- 1 root wheel 65536 May 8 09:05 login.conf.db
-rw-r--r-- 1 root wheel 564 May 8 09:05 mac.conf
drwxr-xr-x 2 root wheel 512 Jul 17 12:51 mail
-rw-r--r-- 1 root wheel 106 May 8 09:05 mail.rc
-rw-r--r-- 1 root wheel 91 Jul 18 19:09 make.conf
-rw-r--r-- 1 root wheel 0 Jul 16 15:20 make.conf.bak
-rw-r--r-- 1 root wheel 1087 Jul 16 15:27 manpath.config
-rw-r--r-- 1 root wheel 946 Jul 16 15:20 manpath.config.bak
-rw------- 1 root wheel 1845 Jul 21 00:20 master.passwd
-rw-r--r-- 1 root wheel 1114 Jul 15 22:29 motd
drwxr-xr-x 2 root wheel 512 Jul 15 23:38 mtree
lrwxrwxrwx 1 root wheel 23 Jul 15 23:38 namedb -> ../var/named/etc/namedb
-rw-r--r-- 1 root wheel 783 May 8 09:05 netconfig
-rwxr-xr-x 1 root wheel 2362 May 8 09:05 netstart
-rw-r--r-- 1 root wheel 13696 May 8 09:05 network.subr
-rw-r--r-- 1 root wheel 365 May 8 09:05 networks
-rw-r--r-- 1 root wheel 1937 May 8 09:05 newsyslog.conf
-rw------- 1 root wheel 1701 May 8 09:05 nsmb.conf
-rw-r--r-- 1 root wheel 113 Jul 15 22:29 nsswitch.conf
drwx------ 2 root wheel 512 May 8 09:00 ntp
-rw------- 1 root wheel 432 May 8 09:05 opieaccess
-rw-r--r-- 1 root wheel 0 Jul 15 22:36 opiekeys
drwxr-xr-x 2 root wheel 512 Jul 15 23:38 pam.d
-rw-r--r-- 1 root wheel 1607 Jul 21 00:20 passwd
-rwxr-xr-x 1 root wheel 5814 May 8 09:05 pccard_ether
drwxr-xr-x 6 root wheel 512 Jul 15 23:38 periodic
-rw-r--r-- 1 root wheel 177 Jul 18 19:22 periodic.conf
-rw-r--r-- 1 root wheel 3567 May 8 09:05 pf.conf
-rw-r--r-- 1 root wheel 22556 May 8 09:05 pf.os
-rw-r--r-- 1 root wheel 293 May 8 09:05 phones
drwxr-xr-x 2 root wheel 512 Jul 15 23:38 ppp
-rw-r--r-- 1 root wheel 2058 May 8 09:05 printcap
-rw-r--r-- 1 root wheel 619 May 8 09:05 profile
-rw-r--r-- 1 root wheel 5807 May 8 09:05 protocols
-rw-r--r-- 1 root wheel 40960 Jul 21 00:20 pwd.db
-rw-r--r-- 1 root wheel 2716 May 8 09:05 rc
-rw-r--r-- 1 root wheel 5298 May 8 09:05 rc.bsdextended
-rw-r--r-- 1 root wheel 942 Jul 20 21:33 rc.conf
-rw-r--r-- 1 root wheel 1114 Jul 20 21:25 rc.conf~
drwxr-xr-x 2 root wheel 2560 Jul 15 23:38 rc.d
-rw-r--r-- 1 root wheel 9569 May 8 09:05 rc.firewall
-rw-r--r-- 1 root wheel 8905 May 8 09:05 rc.firewall6
-rwxr-xr-x 1 root wheel 2165 May 8 09:05 rc.resume
-rw-r--r-- 1 root wheel 5785 May 8 09:05 rc.sendmail
-rw-r--r-- 1 root wheel 3211 May 8 09:05 rc.shutdown
-rw-r--r-- 1 root wheel 30905 May 8 09:05 rc.subr
-rwxr-xr-x 1 root wheel 2209 May 8 09:05 rc.suspend
-rw-r--r-- 1 root wheel 2392 May 8 09:05 remote
-rw-r--r-- 1 root wheel 42 Jul 20 21:25 resolv.conf
lrwxrwxrwx 1 root wheel 13 Jul 15 23:38 rmt -> /usr/sbin/rmt
-rw-r--r-- 1 root wheel 1674 May 8 09:05 rpc
-rw-r--r-- 1 root wheel 73410 May 8 09:05 services
-rw-r--r-- 1 root wheel 237 Jul 16 00:04 shells
drwxr-xr-x 2 root wheel 512 May 8 09:00 skel
-rw------- 1 root wheel 40960 Jul 21 00:20 spwd.db
drwxr-xr-x 2 root wheel 512 Jul 15 22:34 ssh
drwxr-xr-x 2 root wheel 512 Jul 15 23:38 ssl
-rw-r--r-- 1 root wheel 367 May 8 09:05 sysctl.conf
-rw-r--r-- 1 root wheel 1339 May 8 09:05 syslog.conf
lrwxrwxrwx 1 root wheel 23 Jul 15 23:38 termcap -> /usr/share/misc/termcap
-rw-r--r-- 1 root wheel 13 Jul 20 22:48 timezone
-rw-r--r-- 1 root wheel 7658 May 8 09:05 ttys
-rw-r--r-- 1 root wheel 2032 May 8 09:05 usbd.conf
-r--r--r-- 1 root wheel 0 Jul 15 23:42 wall_cmos_clock

[A. Clay Stephenson]

Okay, that's rather convincing data that this is not a simple permission problem. Start probing your ntop.sh shell and redirect both stderr and stdout to a logfile.

['chris']

but how can I do this ?

I mean to do this as a root user ?

[A. Clay Stephenson]

I didn't write your ntop.sh and I didn't write ntop so how can I possibly know what you need to do? I do know how to find out and that is to add
exec 1>>/var/tmp/nlog.txt
exec 2>&1 to the top of your ntop.sh

You then put plenty of echo in the script and everything inclding stderr will now go to /var/tmp/nlog.txt and you look there for the problems. This is debugging 101.

['chris']

this is ntop.sh script:
-----------------------------------------------------------------------------------------------------
#!/bin/sh
interfaces=''

# User to run ntop as; leave blank for root
userid='www'

# [IP:]port for serving HTTP; set to '0' to disable
#http_port='3000'

# [IP:]port for serving HTTPS; set to '0' to disable
# The certificate is /usr/local/etc/ntop/ntop-cert.pem
https_port='10.10.3.77:3001'

# Directory for ntop.access.log
logdir='/var/log'

# Specify any additional arguments here - see ntop(8)
additional_args=''

#
# End of user-configurable variables
#

args='-d -L --set-pcap-nonblocking --skip-version-check'

[ ! -z $interfaces ] && args="$args -i $interfaces"
[ ! -z $http_port ] && args="$args -w $http_port"
[ ! -z $https_port ] && args="$args -W $https_port"
[ ! -z $logdir ] && args="$args -a ${logdir}/ntop.access.log"
[ ! -z $userid ] && args="$args -u $userid"
[ ! -z "$additional_args" ] && args="$args $additional_args"

case "$1" in
start)
# is it the first time we run ntop
[ ! -e /var/db/ntop/ntop_pw.db ] && {
# just in case...
[ ! -d /var/db/ntop ] && {
echo "Reinstalling database directory"
mkdir -p /var/db/ntop
chown -R $userid:$userid /var/db/ntop
}
/usr/local/bin/ntop -u $userid -A || exit 1
echo "Now we can start ntop!"
}
if [ -d $logdir ]; then
touch ${logdir}/ntop.access.log
chown $userid ${logdir}/ntop.access.log
fi
if [ -x /usr/local/bin/ntop ]; then
/usr/local/bin/ntop $args > /dev/null 2>&1 &
echo -n ' ntop'
fi
;;
stop)
killall ntop > /dev/null 2>&1 && echo -n ' ntop'
;;
*)
echo "Usage: `basename $0` {start|stop}" >&2
exit 64
;;
esac

exec 1>>/var/tmp/nlog.txt
exec 2>&1 to the top of your ntop.sh

exit 0
-----------------------------------------------------------------------------------------------------

['chris']

if I put to the top of this srcipt, then I cannot start ntop from command line.

['chris']

I've written these scripts and it seems to work on freeBSD 6.1 using sudo:


#!/usr/bin/perl -w

# ntop startup script

use strict;
use warnings;
use CGI;
#use CGI::Carp qw(fatalsToBrowser);

my $query = new CGI;
my $process = "ntop";

# write the log
BEGIN
{
use CGI::Carp qw(carpout);
my $errorlog = "/var/tmp/ntop_startup_log.txt";
open(LOG, ">$errorlog") or die("Unable to open $errorlog: $!\n");
print LOG "Errors:\n";
carpout(*LOG);
}

$|=1;
print $query->header;
print "\n";
print "\n";
print "\n";
print "\n";
print "<SCRIPT LANGUAGE = \"JavaScript\">\n";
print "\n";
print "</SCRIPT>\n";
print "\n";
print "";
print "
\n";
print "

pls wait, ntop will be started !

\n";

my $return = 'ps -eaf |grep $process |grep -v grep';

my $stop = '/usr/local/bin/sudo /usr/local/www/apache22/cgi-bin/ntop/ntop stop' ;

#if ($return ne "" ) {
#system($stop) == 0 and die "Stop failed: $!"
#}

sleep(10);

print "status:\n";

my $start = system('/usr/local/bin/sudo /usr/local/www/apache22/cgi-bin/ntop/ntop start') and die "...";

print "

";
print "
pls do not forget to shutdown ( kill ), if you're not using \n";
print "\n";
print "";
print "pls wait for 10 seconds before you click on this link:\n";
print "

";
print "GO TO NTOP\n";
print "

";
print "KILL NTOP\n";
print "";
print "";
print "";



and here is the killing script:


#!/usr/bin/perl -w

# ntop kill script

use strict;
use warnings;
use CGI;
use CGI::Carp qw(fatalsToBrowser);

my $query = new CGI;
my $process = "ntop";

# write the log
BEGIN
{
use CGI::Carp qw(carpout);
my $errorlog = "/var/tmp/ntop_kill_log.txt";
open(LOG, ">$errorlog") or die("Unable to open $errorlog: $!\n");
print LOG "Errors:\n";
carpout(*LOG);
}

$|=1;
print $query->header;
print "\n";
print "\n";
print "\n";
print "\n";
print "<SCRIPT LANGUAGE = \"JavaScript\">\n";
print "\n";
print "</SCRIPT>\n";
print "\n";
print "";
print "
\n";
print "

pls wait, ntop will be killed !

\n";
print "";

my $return = 'ps -eaf | grep $process |grep -v grep';

my $stop = '/usr/local/bin/sudo /usr/local/www/apache22/cgi-bin/ntop/ntop stop' ;

#if ($return ne "" ) {
# system ($stop) and die "...";
#}

#if ($return ne "" ) {
#system($stop) == 0 or die "...: $!"
#}

sleep(3);

if ($stop == -1) {
print "failed to execute: $!\n";
} elsif ($stop & 127) {
printf "died with signal %d, %s coredump\n",
($stop & 127), ($stop & 128) ? 'with' : 'without';
} else {
printf " exited with value %d\n", $stop >> 8;
}

print "\n";
print "

";
print "START NTOP\n";
print "

";
print "";
print "";
print "";


maka a great day !
chris