#!/usr/bin/perl
#
# Use try to connect to an IMAP server, and
# wait for the right output.
#
# For use with "mon".
#
# Arguments are "-p port -t timeout host [host...]"
#
# Adapted from "http.monitor" by
# Jim Trocki, trockij@transmeta.com
#
# http.monitor written by
#
# Jon Meek
# American Cyanamid Company
# Princeton, NJ
#
# $Id: imap.monitor,v 1.3 2005/08/20 15:27:56 vitroth Exp $
#
#    Copyright (C) 1998, Jim Trocki
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
use Getopt::Std;
use English;
use Net::SSLeay::Handle;

getopts ("m:p:t:u:w:s");
$PORT = $opt_p || 143;
$TIMEOUT = $opt_t || 30;
$MAILBOX=$opt_m || undef;
$USERNAME=$opt_u || 'ANONYMOUS';
$PASSWORD=$opt_w || 'ANONYMOUS';

@failures = ();

foreach $host (@ARGV) {

    if (! &imapGET($host, $PORT)) {
    push (@failures, $host);
    }
}

if (@failures == 0) {
    exit 0;
}

print join (" ", sort @failures), "\n\n", join ("\n", @longerr), "\n";

exit 1;


sub imapGET {
    use Socket;
    use Sys::Hostname;

    my($Server, $Port) = @_;
    my($ServerOK, $TheContent, $cmd);

    $ServerOK = 0;

    $TheContent = '';

    $Path = '/';

###############################################################
    eval {

    local $SIG{ALRM} = sub { die "Timeout Alarm" };
    alarm $TIMEOUT;
    $result = &OpenSocket($Server, $Port); # Open a connection to the server
    if ($result == 0) { # Failure to open the socket
        push @longerr, "$Server: Unable to connect";
        return '';
    }

    $in = <S>;
    if ($in !~ /^\* (OK|PREAUTH|BYE)/) {
        alarm 0;
        push @longerr, "$Server: No IMAP banner received";
        return 0;
    }

        $cmd="login";
    print S "A1 LOGIN ", $USERNAME, " ", $PASSWORD, "\r\n";

    while (defined($in=<S>)) {
        if ($in =~ /^A1 (\w+) (.*)/) {
                if ($1 eq "OK") {
                $ServerOK = 1;
                } else {
                    $errmsg="$1 $2";
                }
        last;
        }
    }

        if ($ServerOK && $MAILBOX) {
           $cmd="examine";
           $ServerOK=0;
       print S "A2 EXAMINE $MAILBOX\r\n";

       while (defined($in=<S>)) {
           if ($in =~ /^A2 (\w+) (.*)/) {
                   if ($1 eq "OK") {
                   $ServerOK = 1;
                   } else {
                       $errmsg="$1 $2";
                   }
           last;
           }
       }
    }

        if ($ServerOK) {
           $cmd="logout";
           $ServerOK=0;
       print S "A3 LOGOUT\r\n";

       while (defined($in=<S>)) {
           if ($in =~ /^A3 (\w+) (.*)/) {
                   if ($1 eq "OK") {
                   $ServerOK = 1;
                   } else {
                       $errmsg="$1 $2";
                   }
           last;
           }
       }
    }
    if (!$ServerOK) {
          if ($errmsg) {
         push @longerr, "$Server: bad response to $cmd: $errmsg";
          } else {
         push @longerr, "$Server: No response to $cmd";
          }
    }


    close(S);
    alarm 0; # Cancel the alarm

    };

    if ($EVAL_ERROR and ($EVAL_ERROR =~ /^Timeout Alarm/)) {
    push @longerr, "$Server: **** Time Out\n";
    return 0;
    } elsif ($EVAL_ERROR) {
        push @longerr, "$Server: $EVAL_ERROR";
        return 0;
    }
    return $ServerOK;

}

sub OpenSocket {
#
# Make a Berkeley socket connection between this program and a TCP port
#  on another (or this) host. Port can be a number or a named service
#
    local($OtherHostname, $Port) = @_;
    local($OurHostname, $sockaddr, $name, $aliases, $proto, $type, $len,
      $ThisAddr, $that);
    $OurHostname = &hostname;

    ($name, $aliases, $proto) = getprotobyname('tcp');
    ($name, $aliases, $Port) = getservbyname($Port, 'tcp') unless $Port =~ /^\d+$/;
    ($name, $aliases, $type, $len, $ThisAddr) = gethostbyname($OurHostname);
    ($name, $aliases, $type, $len, $OtherHostAddr) = gethostbyname($OtherHostname);

    my $that = sockaddr_in ($Port, $OtherHostAddr);

    if ($opt_s)
    {
        tie(*S, "Net::SSLeay::Handle", $OtherHostname, $Port) ||
            return undef;
    }
    else
    {
        $result = socket(S, &PF_INET, &SOCK_STREAM, $proto) || return undef;

        $result = connect(S, $that) || return undef;
    }
    select(S); $| = 1; select(STDOUT);      # set S to be un-buffered
    return 1;                               # success
}