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/usr/bin/traptoemail is in snmptrapd 5.7.2.1+dfsg-1+deb8u1+b1.

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#!/usr/bin/perl

# This is a snmptrapd handler script to convert snmp traps into email
# messages.

# Usage:
# Put a line like the following in your snmptrapd.conf file:
#  traphandle TRAPOID|default /usr/local/bin/traptoemail [-f FROM] [-s SMTPSERVER]b ADDRESSES
#     FROM defaults to "root"
#     SMTPSERVER defaults to "localhost"

use Net::SMTP;
use Getopt::Std;
use POSIX qw(strftime);

$opts{'s'} = "localhost";
$opts{'f'} = 'root@' . `hostname`;
chomp($opts{'f'});
getopts("hs:f:", \%opts);

if ($opts{'h'}) {
    print "
traptoemail [-s smtpserver] [-f fromaddress] toaddress [...]

  traptoemail shouldn't be called interatively by a user.  It is
  designed to be called as an snmptrapd extension via a \"traphandle\"
  directive in the snmptrapd.conf file.  See the snmptrapd.conf file for
  details.

  Options:
    -s smtpserver      Sets the smtpserver for where to send the mail through.
    -f fromaddress     Sets the email address to be used on the From: line.
    toaddress          Where you want the email sent to.

";
    exit;
}

die "no recepients to send mail to" if ($#ARGV < 0);

# process the trap:
$hostname = <STDIN>;
chomp($hostname);
$ipaddress = <STDIN>;
chomp($ipaddress);

$maxlen = 0;
while(<STDIN>) {
    ($oid, $value) = /([^\s]+)\s+(.*)/;
    push @oids, $oid;
    push @values, $value;
    $maxlen = (length($oid) > $maxlen) ? length($oid) : $maxlen;
}
$maxlen = 60 if ($maxlen > 60);
$formatstr = "%" . $maxlen . "s  %s\n";

die "illegal trap" if ($#oids < 1);

# send the message
$message = Net::SMTP->new($opts{'s'}) || die "can't talk to server $opts{'s'}\n";
$message->mail($opts{'f'});
$message->to(@ARGV) || die "failed to send to the recepients ",join(",",@ARGV),": $!";
$message->data();
$message->datasend("To: " . join(", ",@ARGV) . "\n");
$message->datasend("From: $opts{f}\n");
$message->datasend("Date: ".strftime("%a, %e %b %Y %X %z", localtime())."\n");
$message->datasend("Subject: trap received from $hostname: $values[1]\n");
$message->datasend("\n");
$message->datasend("Host: $hostname ($ipaddress)\n");
for($i = 0; $i <= $#oids; $i++) {
    $message->datasend(sprintf($formatstr, $oids[$i], $values[$i]));
}
$message->dataend();
$message->quit;