/usr/lib/nagios/plugins/check_smtp_send_epn is in nagios-plugins-contrib 14.20141104.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 | #!/usr/bin/perl
use strict;
use POSIX qw(strftime);
my $VERSION = '0.7.3';
my $COPYRIGHT = 'Copyright (C) 2005-2011 Jonathan Buhacoff <jonathan@buhacoff.net>';
my $LICENSE = 'http://www.gnu.org/licenses/gpl.txt';
my %status = ( 'OK' => 0, 'WARNING' => 1, 'CRITICAL' => 2, 'UNKNOWN' => 3 );
# look for required modules
exit $status{UNKNOWN} unless load_modules(qw/Getopt::Long Net::SMTP/);
BEGIN {
if( grep { /^--hires$/ } @ARGV ) {
eval "use Time::HiRes qw(time);";
warn "Time::HiRes not installed\n" if $@;
}
}
Getopt::Long::Configure("bundling");
my $verbose = 0;
my $help = "";
my $help_usage = "";
my $show_version = "";
my $smtp_server = "";
my $default_smtp_port = "25";
my $default_smtp_ssl_port = "465";
my $default_smtp_tls_port = "587";
my $smtp_port = "";
my @mailto = ();
my $mailfrom = "";
my @header = ();
my $body = "";
my $stdin = "";
my $template = "";
my $expect_response = "250";
my $warntime = 15;
my $criticaltime = 30;
my $timeout = 60;
my $tls = 0;
my $ssl = 0;
my $auth_method = undef;
my $username = "";
my $password = "";
my $time_hires = "";
my $mx_lookup = 0;
my $ok;
$ok = Getopt::Long::GetOptions(
"V|version"=>\$show_version,
"v|verbose+"=>\$verbose,"h|help"=>\$help,"usage"=>\$help_usage,
"w|warning=i"=>\$warntime,"c|critical=i"=>\$criticaltime,"t|timeout=i"=>\$timeout,
# smtp settings
"H|hostname=s"=>\$smtp_server,"p|port=i"=>\$smtp_port,
"mailto=s"=>\@mailto, "mailfrom=s",\$mailfrom,
"header=s"=>\@header, "body=s"=>\$body, "stdin"=>\$stdin,
"template!"=>\$template,
# SSL/TLS/auth options
"tls!"=>\$tls, "ssl!"=>\$ssl, "auth=s"=>\$auth_method,
"U|username=s"=>\$username,"P|password=s"=>\$password,
# Server response
"E|expect-response=s"=>\$expect_response,
# Time
"hires"=>\$time_hires,
);
if( $show_version ) {
print "$VERSION\n";
if( $verbose ) {
print "Default warning threshold: $warntime seconds\n";
print "Default critical threshold: $criticaltime seconds\n";
print "Default timeout: $timeout seconds\n";
}
exit $status{UNKNOWN};
}
if( $help ) {
exec "perldoc", $0 or print "Try `perldoc $0`\n";
exit $status{UNKNOWN};
}
if( $smtp_server eq "" && scalar(@mailto) == 1 ) {
# no SMTP server specified but one mailto address given means we can look up the MX record
$mx_lookup = 1;
}
my @required_module = ();
push @required_module, 'Net::SMTP::SSL' if $ssl;
push @required_module, ('MIME::Base64','Authen::SASL') if $ssl && $username;
push @required_module, 'Net::SMTP::TLS' if $tls;
push @required_module, 'Net::SMTP_auth' if $auth_method and not $tls; # whereas if auth_method and tls we use TLS_auth, which is included in this script!
push @required_module, 'Text::Template' if $template;
push @required_module, 'Net::DNS' if $mx_lookup;
push @required_module, 'Email::Address' if $mx_lookup;
exit $status{UNKNOWN} unless load_modules(@required_module);
# split up @mailto if commas were used instead of multiple options
@mailto = split(/,/,join(',',@mailto));
if( $help_usage ||
(
($smtp_server eq "" && !$mx_lookup) || scalar(@mailto)==0 || $mailfrom eq ""
)
) {
print "Usage: $0 [-H host [-p port]] --mailto recipient\@your.net [--mailto recipient2\@your.net ...] --mailfrom sender\@your.net --body 'some text' [-w <seconds>] [-c <seconds>]\n";
exit $status{UNKNOWN};
}
# initialize
my $report = new PluginReport;
my $time_start = time;
my $actual_response = undef;
my @warning = ();
my @critical = ();
my $smtp_debug = 0;
$smtp_debug = 1 if $verbose >= 3;
# default date and message id headers
push @header, default_date_header() unless find_header("Date",@header);
push @header, default_messageid_header() unless find_header("Message-ID",@header);
# look up MX server if necessary
if( $mx_lookup ) {
my $addr = Email::Address->new( undef, $mailto[0] );
my $mx_domain = $addr->host;
print "MX lookup " . $mx_domain . "\n" if $verbose > 1;
my $res = Net::DNS::Resolver->new;
my @mx = Net::DNS::mx($res, $mx_domain);
if( @mx ) {
# use the first server
foreach my $rr (@mx) {
print "pref : " . $rr->preference . " exchange: " . $rr->exchange . "\n" if $verbose > 2;
}
$smtp_server = $mx[0]->exchange;
print "smtp server: $smtp_server\n" if $verbose;
}
else {
print "SMTP SEND CRITICAL - Cannot find MX records for $mx_domain\n";
exit $status{CRITICAL};
}
}
# connect to SMTP server
# create the smtp handle using Net::SMTP, Net::SMTP::SSL, Net::SMTP::TLS, or an authentication variant
my $smtp;
eval {
if( $tls and $auth_method ) {
$smtp_port = $default_smtp_tls_port unless $smtp_port;
$smtp = TLS_auth->new($smtp_server, Timeout=>$timeout, Port=>$smtp_port, User=>$username, Password=>$password, Auth_Method=>$auth_method);
if( $smtp ) {
my $message = oneline($smtp->message());
die "cannot connect with TLS/$auth_method: $message" if $smtp->code() =~ m/53\d/;
}
}
elsif( $tls ) {
$smtp_port = $default_smtp_tls_port unless $smtp_port;
$smtp = Net::SMTP::TLS->new($smtp_server, Timeout=>$timeout, Port=>$smtp_port, User=>$username, Password=>$password);
if( $smtp ) {
my $message = oneline($smtp->message());
die "cannot connect with TLS: $message" if $smtp->code() =~ m/53\d/;
}
}
elsif( $ssl ) {
$smtp_port = $default_smtp_ssl_port unless $smtp_port;
$smtp = Net::SMTP::SSL->new($smtp_server, Port => $smtp_port, Timeout=>$timeout,Debug=>$smtp_debug);
if( $smtp && $username ) {
$smtp->auth($username, $password);
my $message = oneline($smtp->message());
die "cannot connect with SSL/password: $message" if $smtp->code() =~ m/53\d/;
}
}
elsif( $auth_method ) {
$smtp_port = $default_smtp_port unless $smtp_port;
$smtp = Net::SMTP_auth->new($smtp_server, Port=>$smtp_port, Timeout=>$timeout,Debug=>$smtp_debug);
if( $smtp ) {
$smtp->auth($auth_method, $username, $password);
my $message = oneline($smtp->message());
die "cannot connect with SSL/$auth_method: $message" if $smtp->code() =~ m/53\d/;
}
}
else {
$smtp_port = $default_smtp_port unless $smtp_port;
$smtp = Net::SMTP->new($smtp_server, Port=>$smtp_port, Timeout=>$timeout,Debug=>$smtp_debug);
if( $smtp && $username ) {
$smtp->auth($username, $password);
my $message = oneline($smtp->message());
die "cannot connect with password: $message" if $smtp->code() =~ m/53\d/;
}
}
};
if( $@ ) {
$@ =~ s/\n/ /g; # the error message can be multiline but we want our output to be just one line
print "SMTP SEND CRITICAL - $@\n";
exit $status{CRITICAL};
}
unless( $smtp ) {
print "SMTP SEND CRITICAL - Could not connect to $smtp_server port $smtp_port\n";
exit $status{CRITICAL};
}
my $time_connected = time;
# add the monitored server's banner to the report
if( $tls ) {
$report->{banner} = "";
}
elsif( $ssl ) {
$report->{banner} = $smtp->banner || "";
chomp $report->{banner};
}
else {
$report->{banner} = $smtp->banner || "";
chomp $report->{banner};
}
# send email
if( $stdin ) {
$body = "";
while(<STDIN>) {
$body .= $_;
}
}
# if user wants to use template substitutions, this is the place to process body and headers
if( $template ) {
foreach my $item (@header,$body) {
my $t = Text::Template->new(TYPE=>'STRING',SOURCE=>$item,PACKAGE=>'SmtpMessageTemplate');
$item = $t->fill_in(PREPEND=>q{package SmtpMessageTemplate;});
# print "item: $item\n";
}
}
$smtp->mail($mailfrom);
foreach( @mailto ) {
# the two SMTP modules have different error reporting mechanisms:
if( $tls ) {
# Net::SMTP::TLS croaks when the recipient is rejected
eval {
$smtp->to($_);
};
if( $@ ) {
print "SMTP SEND CRITICAL - Could not send to $_\n";
print "Reason: $@\n" if $verbose;
exit $status{CRITICAL};
}
}
else {
# Net::SMTP returns false when the recipient is rejected
my $to_returned = $smtp->to($_);
if( !$to_returned ) {
print "SMTP SEND CRITICAL - Could not send to $_\n";
print "Reason: Recipient rejected or authentication failed\n" if $verbose;
exit $status{CRITICAL};
}
}
}
# Net::SMTP::TLS doesn't implement code() so we need to wrap calls in eval to get our error messages
# start data transfer (expect response 354)
$smtp->data();
# send data
$smtp->datasend("To: ".join(", ",@mailto)."\n");
$smtp->datasend("From: $mailfrom\n");
foreach( @header ) {
$smtp->datasend("$_\n");
}
$smtp->datasend("\n");
$smtp->datasend($body);
$smtp->datasend("\n");
eval {
# end data transfer (expect response 250)
$smtp->dataend();
};
if( $@ ) {
$actual_response = $tls ? get_tls_error($@) : $smtp->code();
}
else {
$actual_response = $tls ? "250" : $smtp->code(); # no error means we got 250
}
eval {
# disconnect from SMTP server (expect response 221)
$smtp->quit();
};
if( $@ ) {
push @warning, "Error while disconnecting from $smtp_server";
}
# calculate elapsed time and issue warnings
my $time_end = time;
my $elapsedtime = $time_end - $time_start;
$report->{seconds} = $elapsedtime;
push @warning, "connection time more than $warntime" if( $time_connected - $time_start > $warntime );
push @critical, "connection time more than $criticaltime" if( $time_connected - $time_start > $criticaltime );
push @critical, "response was $actual_response but expected $expect_response" if ( $actual_response ne $expect_response );
# print report and exit with known status
my $perf_data = "elapsed=".$report->{seconds}."s;$warntime;$criticaltime"; # TODO: need a component for safely generating valid perf data format. for notes on the format, see http://www.perfparse.de/tiki-view_faq.php?faqId=6 and http://nagiosplug.sourceforge.net/developer-guidelines.html#AEN185
my $short_report = $report->text(qw/seconds/) . " | $perf_data";
my $long_report = join("", map { "$_: $report->{$_}\n" } qw/banner/ );
if( scalar @critical ) {
my $crit_alerts = join(", ", @critical);
print "SMTP SEND CRITICAL - $crit_alerts; $short_report\n";
print $long_report if $verbose;
exit $status{CRITICAL};
}
if( scalar @warning ) {
my $warn_alerts = join(", ", @warning);
print "SMTP SEND WARNING - $warn_alerts; $short_report\n";
print $long_report if $verbose;
exit $status{WARNING};
}
print "SMTP SEND OK - $short_report\n";
print $long_report if $verbose;
exit $status{OK};
# utility to load required modules. exits if unable to load one or more of the modules.
sub load_modules {
my @missing_modules = ();
foreach( @_ ) {
eval "require $_";
push @missing_modules, $_ if $@;
}
if( @missing_modules ) {
print "Missing perl modules: @missing_modules\n";
return 0;
}
return 1;
}
# utility to extract error codes out of Net::SMTP::TLS croak messages
sub get_tls_error {
my ($errormsg) = @_;
$errormsg =~ m/: (\d+) (.+)/;
my $code = $1;
return $code;
}
# looks for a specific header in a list of headers; returns true if found
sub find_header {
my ($name, @list) = @_;
return scalar grep { m/^$name: /i } @list;
}
# RFC 2822 date header
sub default_date_header {
return strftime "Date: %a, %e %b %Y %H:%M:%S %z (%Z)", gmtime;
}
# RFC 2822 message id header
sub default_messageid_header {
my $random = randomstring(16,qw/0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y z/);
my $hostname = `hostname`;
chomp $hostname;
return "Message-ID: <".time.".".$random.".checksmtpsend@".$hostname.">";
}
# returns a random string of specified length using characters from specified set
sub randomstring {
my ($length,@set) = @_;
my $size = scalar @set;
my $string = "";
while($length--) {
$string .= $set[int(rand($size))];
}
return $string;
}
# replaces all newlines in the input string with spaces
sub oneline {
my ($input) = @_;
$input =~ s/[\r\n]+/ /g;
return $input;
}
# NAME
# PluginReport
# SYNOPSIS
# $report = new PluginReport;
# $report->{label1} = "value1";
# $report->{label2} = "value2";
# print $report->text(qw/label1 label2/);
package PluginReport;
sub new {
my ($proto,%p) = @_;
my $class = ref($proto) || $proto;
my $self = bless {}, $class;
$self->{$_} = $p{$_} foreach keys %p;
return $self;
}
sub text {
my ($self,@labels) = @_;
my @report = map { "$self->{$_} $_" } grep { defined $self->{$_} } @labels;
my $text = join(", ", @report);
return $text;
}
package SmtpMessageTemplate;
sub trim {
my ($text) = @_;
$text =~ s/^\s*//;
$text =~ s/\s*$//;
return $text;
}
# NAME
# TLS_auth
# SYNOPSYS
#
# Based on contribution by Brad Guillory
package TLS_auth;
#use Net::SMTP::TLS;
our @ISA = qw(Net::SMTP::TLS);
use Carp;
sub new {
my ($proto,$server,%p) = @_;
my $class = ref($proto) || $proto;
#my $self = bless {}, $class;
no strict 'refs';
no warnings 'once';
*Net::SMTP::TLS::login = *TLS_auth::login; # override parent's login with ours so when it's called in the constructor, our overriden version will be used
my $self = Net::SMTP::TLS->new($server,%p);
return $self;
}
sub login {
my ($self) = @_;
my $type = $self->{features}->{AUTH};
if(not $type){
die "Server did not return AUTH in capabilities\n"; # croak
}
# print "Feature: $type\nAuth Method: $self->{Auth_Method}\n";
if($type =~ /CRAM\-MD5/ and $self->{Auth_Method} =~ /CRAM\-MD5/i){
$self->auth_MD5();
}elsif($type =~ /LOGIN/ and $self->{Auth_Method} =~ /LOGIN/i){
$self->auth_LOGIN();
}elsif($type =~ /PLAIN/ and $self->{Auth_Method} =~ /PLAIN/i){
#print "Calling auth_PLAIN\n";
$self->auth_PLAIN();
}else{
die "Unsupported Authentication mechanism: $self->{Auth_Method}\n"; # croak
}
}
package main;
1;
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