reniced: should now convert uids to usernames before sending mail.
This commit is contained in:
Ole Tange
parent
87e4f6de9f
commit
60fba79682
155
reniced/reniced
Executable file
155
reniced/reniced
Executable file
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@ -0,0 +1,155 @@
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#!/usr/bin/perl -w
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init_whitelist();
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renice_all(60);
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sub init_whitelist {
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my @whitelist_commands;
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my @whitelist_users = ("root", "syslog", "ntp", "bind", "snmp", "postfix");
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if(-f "/etc/reniced/whitelist.users") {
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@whitelist_users = `cat /etc/reniced/whitelist.users`;
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chomp(@whitelist_users);
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}
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for (@whitelist_users) {
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$Global::whitelist_users{$_} = 1;
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}
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if(-f "/etc/reniced/whitelist.commands") {
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@whitelist_commands = `cat /etc/reniced/whitelist.commands`;
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chomp(@whitelist_commands);
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}
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for (@whitelist_commands) {
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$Global::whitelist_commands{$_} = 1;
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}
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}
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sub renice_all {
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my $cpu_seconds = shift;
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my $ps = ps();
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my @pids_to_renice = grep_ps($cpu_seconds,$ps);
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my $user_pid_list = user_pid_list($ps,@pids_to_renice);
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for my $user (keys %$user_pid_list) {
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if($user =~ /^\d+$/) {
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# All digits username => probably a >8 char username => lookup uid
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my ($login,$pass,$uid,$gid) = getpwnam($user);
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$user = $login;
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}
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renice_user($cpu_seconds, $user, $ps, @{$user_pid_list->{$user}});
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}
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}
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sub renice_user {
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my ($cpu_seconds, $user, $ps, @pid) = (@_);
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my @command;
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for my $pid (@pid) {
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# Convert pid to human readable:
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# my_command (1192)
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push @command, $ps->{$pid}{'cmd'}."(".$pid.")";
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}
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mail($cpu_seconds, $user, @command);
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renice(@pid);
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}
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sub mail {
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my($cpu_seconds, $user, @command) = @_;
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my @mail =
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(
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'From: Ole Tanges renice program <tange@binf.ku.dk>',
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"To: <$user>",
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'Subject: Your program has been reniced',
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'',
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"Hi $user.",
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'',
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'Your program:',
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'',
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" @command",
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'',
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"has been using more than $cpu_seconds CPU seconds. I have therefore niced it to nice level 19.",
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'',
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'If you want to avoid that in the future, you can start the program with a different nice level:',
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'',
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' nice -n XX your_command',
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'',
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'where XX is:',
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' 1 - urgent',
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' 10 - normal',
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' 15 - low',
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' 18 - only use spare capacity',
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'',
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'Regards',
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'',
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"Ole Tange's renice program",
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);
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open(S,"|/usr/sbin/sendmail -t") or die;
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print S map { $_,"\n" } @mail;
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close S;
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open(LOG,">>/tmp/reniced") || die;
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print LOG map { $_,"\n" } @mail;
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close LOG;
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}
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sub user_pid_list {
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# given $ps and @pid return {user => @pids}
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my ($ps,@pid) = @_;
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my $user;
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for my $pid (@pid) {
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push @{$user->{$ps->{$pid}{'user'}}}, $pid;
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}
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return $user;
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}
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sub renice {
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my @pid = @_;
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`renice -n 19 -p @pid 2>&1`;
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return $?;
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}
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sub ps {
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# return: {pid}->{'nice' => nicelevel, 'user' => username, 'cmd' => command, 'cputime' => cpu_seconds_used}
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my @out = `ps -eo '%p %u %n %x %c'`;
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my $ps;
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shift @out; # Remove header
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for (@out) {
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if(/^\s*(\d+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+.*)$/) {
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# pid user nice cputime command
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my($pid, $user, $nice, $cputime, $cmd) = ($1, $2, $3, $4, $5);
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$ps->{$pid}{'user'} = $user;
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$ps->{$pid}{'cmd'} = $cmd;
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$ps->{$pid}{'nice'} = ($nice eq "-") ? 0 : $nice;
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if($cputime=~/((\d+)-)?(\d\d):(\d\d):(\d\d)/) {
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my $days = $2 ? $2 : 0;
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$ps->{$pid}{'cputime'} = $days*24*60*60+$3*60*60+$4*60+$5;
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} else {
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warn("cputime not matched: $cputime");
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}
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} else {
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warn("ps line not matched: $_");
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}
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}
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return $ps;
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}
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sub grep_ps {
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my ($maxcputime,$ps) = (@_);
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my @result;
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for my $pid (keys %$ps) {
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if($Global::whitelist_users{$ps->{$pid}{'user'}}) {
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# User is on the whitelist
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next;
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}
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if($Global::whitelist_commands{$ps->{$pid}{'cmd'}}) {
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# Command is on the whitelist
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next;
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}
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if($ps->{$pid}{'nice'} >= 1) {
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# Command is already niced
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next;
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}
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if($ps->{$pid}{'cputime'} > $maxcputime) {
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push @result, $pid;
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}
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}
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return @result;
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}
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