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|
#! /usr/bin/perl
use DBI;
use POSIX;
use Time::HiRes;
use Net::Telnet;
use strict;
use warnings;
use lib '../include';
use nms;
use threads;
our $running = 0;
our $dbh = nms::db_connect();
$dbh->{AutoCommit} = 0;
$dbh->{RaiseError} = 1;
# normal mode: fetch switches from the database
# instant mode: poll the switches specified on the command line
my $instant = defined($ARGV[0]);
my $qualification;
if ($instant) {
$qualification = "sysname LIKE ?";
} else {
$qualification = <<"EOF";
(last_updated IS NULL OR now() - last_updated > poll_frequency)
AND (locked='f' OR now() - last_updated > '5 minutes'::interval)
AND ip is not null
EOF
}
our $qswitch = $dbh->prepare(<<"EOF")
SELECT
*,
DATE_TRUNC('second', now() - last_updated - poll_frequency) AS overdue
FROM
switches
NATURAL LEFT JOIN switchtypes
WHERE $qualification
ORDER BY
priority DESC,
overdue DESC
LIMIT 1
FOR UPDATE OF switches
EOF
or die "Couldn't prepare qswitch";
our $qlock = $dbh->prepare("UPDATE switches SET locked='t', last_updated=now() WHERE switch=?")
or die "Couldn't prepare qlock";
our $qunlock = $dbh->prepare("UPDATE switches SET locked='f', last_updated=now() WHERE switch=?")
or die "Couldn't prepare qunlock";
our $qpoll = $dbh->prepare("INSERT INTO polls (time, switch, port, bytes_in, bytes_out, errors_in, errors_out, official_port) VALUES (timeofday()::timestamp,?,?,?,?,?,?,true)")
or die "Couldn't prepare qpoll";
poll_loop(@ARGV);
while ($running > 0) {
SNMP::MainLoop(0.1);
}
sub poll_loop {
my @switches = @_;
my $instant = (scalar @switches > 0);
my $timeout = 15;
while (1) {
my $sysname;
if ($instant) {
$sysname = shift @ARGV;
return if (!defined($sysname));
$qswitch->execute('%'.$sysname.'%')
or die "Couldn't get switch";
} else {
# Find a switch to grab
$qswitch->execute()
or die "Couldn't get switch";
}
my $switch = $qswitch->fetchrow_hashref();
if (!defined($switch)) {
$dbh->commit;
if ($instant) {
mylog("No such switch $sysname available, quitting.");
return;
} else {
mylog("No available switches in pool, sleeping.");
SNMP::MainLoop(1.0);
next;
}
}
$qlock->execute($switch->{'switch'})
or die "Couldn't lock switch";
$dbh->commit;
if ($switch->{'locked'}) {
mylog("WARNING: Lock timed out on $switch->{'ip'}, breaking lock");
}
my $msg;
if (defined($switch->{'overdue'})) {
$msg = sprintf "Polling ports %s on %s (%s), %s overdue.",
$switch->{'ports'}, $switch->{'ip'}, $switch->{'sysname'}, $switch->{'overdue'};
} else {
$msg = sprintf "Polling ports %s on %s (%s), never polled before.",
$switch->{'ports'}, $switch->{'ip'}, $switch->{'sysname'};
}
mylog($msg);
my $ip = $switch->{'ip'};
if ($ip eq '127.0.0.1') {
mylog("Polling disabled for this switch, skipping.");
$qunlock->execute($switch->{'switch'})
or die "Couldn't unlock switch";
$dbh->commit;
next;
}
my $community = $switch->{'community'};
my $start = [Time::HiRes::gettimeofday];
my $session;
eval {
$session = nms::snmp_open_session($ip, $community, 1);
};
if ($@) {
warn "Couldn't open session (even an async one!) to $ip: $!";
$qunlock->execute($switch->{'switch'})
or die "Couldn't unlock switch";
$dbh->commit;
next;
};
my @ports = expand_ports($switch->{'ports'});
my $switch_status = {
session => $session,
ip => $switch->{'ip'},
sysname => $switch->{'sysname'},
switch => $switch->{'switch'},
num_ports => scalar @ports,
num_done => 0,
start => $start,
};
for my $port (@ports) {
my @vars = ();
push @vars, ["ifHCInOctets", $port];
push @vars, ["ifHCOutOctets", $port];
push @vars, ["ifInErrors", $port];
push @vars, ["ifOutErrors", $port];
my $varlist = SNMP::VarList->new(@vars);
$session->get($varlist, [ \&callback, $switch_status, $port ]);
}
$running++;
$dbh->rollback;
}
}
sub expand_ports {
my $in = shift;
my @ranges = split /,/, $in;
my @ret = ();
for my $range (@ranges) {
if ($range =~ /^\d+$/) {
push @ret, $range;
} elsif ($range =~ /^(\d+)-(\d+)$/) {
for my $i ($1..$2) {
push @ret, $i;
}
} else {
die "Couldn't understand '$range' in ports";
}
}
return (sort { $a <=> $b } @ret);
}
sub mylog {
my $msg = shift;
my $time = POSIX::ctime(time);
$time =~ s/\n.*$//;
printf STDERR "[%s] %s\n", $time, $msg;
}
sub callback {
my ($switch, $port, $vars) = @_;
my ($in, $out, $ine, $oute) = (undef, undef, undef, undef);
for my $var (@$vars) {
if ($port != $var->[1]) {
die "Response for unknown OID $var->[0].$var->[1] (expected port $port)";
}
if ($var->[0] eq 'ifHCInOctets') {
$in = $var->[2];
} elsif ($var->[0] eq 'ifHCOutOctets') {
$out = $var->[2];
} elsif ($var->[0] eq 'ifInErrors') {
$ine = $var->[2];
} elsif ($var->[0] eq 'ifOutErrors') {
$oute = $var->[2];
} else {
die "Response for unknown OID $var->[0].$var->[1]";
}
}
my $ok = 1;
if (!defined($in) || $in !~ /^\d+$/) {
if (defined($ine)) {
warn $switch->{'sysname'}.":$port: failed reading in";
}
$ok = 0;
}
if (!defined($out) || $out !~ /^\d+$/) {
if (defined($oute)) {
warn $switch->{'sysname'}.":$port: failed reading in";
}
$ok = 0;
}
if ($ok) {
$qpoll->execute($switch->{'switch'}, $port, $in, $out, $ine, $oute) || die "%s:%s: %s\n", $switch->{'switch'}, $port, $in;
$dbh->commit;
}
if (++$switch->{'num_done'} == $switch->{'num_ports'}) {
--$running;
my $elapsed = Time::HiRes::tv_interval($switch->{'start'});
my $msg = sprintf "Polled $switch->{'ip'} in %5.3f seconds.", $elapsed;
mylog($msg);
$qunlock->execute($switch->{'switch'})
or warn "Couldn't unlock switch";
$dbh->commit;
}
}
|
