#!/usr/bin/perl

use strict;
use warnings;

use Cwd;
use Data::Dumper;
use DBIx::Simple;
use IO::File;
use File::stat;
use Time::TAI64 qw/ tai2unix /;

$Data::Dumper::Sortkeys = 1;

my $logdir   = get_log_dir();
my @logfiles = get_logfiles($logdir);

my (%plugins, %os, %message_ids);
my $has_cleanup;
my $db = get_db();
check_plugins_table();

foreach my $file (@logfiles) {
    my ($fid, $offset) = check_logfile($file);
    $fid or next;
    parse_logfile($file, $fid, $offset);
}

exit;

sub trim_message {
    my $mess = shift;

    return '' if $mess eq 'skip, naughty';
    return '' if $mess eq 'skip, relay client';
    return '' if $mess eq 'skip, no match';
    return '' if $mess eq 'skip: unsigned';
    return '' if $mess eq 'skip, not a null sender';
    return '' if $mess eq 'pass';
    return '' if $mess eq 'pass, no record';
    return '' if $mess eq 'pass, Deliverable through vpopmail';
    return '' if $mess eq 'pass, clean';
    return '' if $mess =~ /^fail. NAUGHTY/;
    return '' if $mess =~ /^PTR:\s/;
    return '' if $mess eq 'TLS setup returning';

    return $mess;
}

sub get_os_id {
    my $p0f_string = shift or return;

    $p0f_string =~ s/\s+$//;
    $p0f_string =~ s/^\s+//;
    return if !$p0f_string;
    return if $p0f_string =~ /no match/;
    return if $p0f_string =~ /^skip/;
    return if $p0f_string =~ /^\d/;
    return if $p0f_string =~ /^\(/;
    return if $p0f_string !~ /\w/;
    return if $p0f_string =~ /no longer in the cache/;

    if (!scalar keys %os) {
        my $ref = exec_query('SELECT * FROM os');
        foreach my $o (@$ref) {
            $os{$o->{name}} = $o->{id};
        }
    }

    if (!defined $os{$p0f_string}) {
        warn "missing OS for $p0f_string\n";
    }

    return $os{$p0f_string};
}

sub get_plugin_id {
    my $plugin = shift;

    if (!scalar keys %plugins) {
        my $ref = exec_query('SELECT * FROM plugin');
        foreach my $p (@$ref) {
            $plugins{$p->{name}} = $p->{id};
            $plugins{$p->{id}}   = $p->{name};
        }
        $ref = exec_query('SELECT * FROM plugin_aliases');
        foreach my $pa (@$ref) {
            $plugins{$pa->{name}} = $pa->{plugin_id};
        }
    }

    if (!defined $plugins{$plugin}) {

        #warn Dumper(\%plugins);
        die "missing DB plugin $plugin\n";
    }

    return $plugins{$plugin};
}

sub get_msg_id {
    my ($fid, $pid) = @_;

    return $message_ids{"$fid-$pid"} if $message_ids{"$fid-$pid"};

    #print "searching for message $pid...";
    my $msgs = exec_query('SELECT * FROM message WHERE file_id=? AND qp_pid=?',
                          [$fid, $pid]);

    #print scalar @$msgs ? "y\n" : "n\n";
    if ($msgs->[0]{id}) {
        $message_ids{"$fid-$pid"} = $msgs->[0]{id};
    }
    return $msgs->[0]{id};
}

sub create_message {
    my ($fid, $ts, $pid, $message) = @_;

    my ($host, $ip) = split /\s/, $message;
    $ip = substr $ip, 1, -1;    # remove brackets

    my $id = exec_query(
"INSERT INTO message SET file_id=?, connect_start=FROM_UNIXTIME(?), qp_pid=?, ip=INET_ATON(?)",
        [$fid, $ts, $pid, $ip]
    );

    if ($host && $host ne 'Unknown') {
        exec_query("UPDATE message SET hostname=? WHERE id=?", [$host, $id]);
    }

    #warn "host updated: $host\n";
}

sub insert_plugin {
    my ($msg_id, $plugin, $message) = @_;

    my $plugin_id = get_plugin_id($plugin);

    if ($plugin eq 'ident::geoip') {
        my ($gip, $distance) = $message =~ /(.*?),\s+([\d]+)\skm/;
        if ($distance) {
            exec_query('UPDATE message SET distance=? WHERE id=?',
                       [$distance, $msg_id]);
            $message = $gip;
        }
    }
    elsif ($plugin =~ /^ident::p0f/) {
        my $os_id = get_os_id($message);
        if ($os_id) {
            exec_query('UPDATE message SET os_id=? WHERE id=?',
                       [$os_id, $msg_id]);
            $message = 'pass';
        }
    }
    elsif ($plugin eq 'connection_time') {
        my ($seconds) = $message =~ /\s*([\d\.]+)\s/;
        if ($seconds) {
            exec_query('UPDATE message SET time=? WHERE id=?',
                       [$seconds, $msg_id]);
            $message = 'pass';
        }
    }

    my $result = get_score($message);
    if ($result) {
        $message = trim_message($message);
    }

    exec_query(
'INSERT INTO message_plugin SET msg_id=?, plugin_id=?, result=?, string=?',
        [$msg_id, $plugin_id, $result, $message]
    );
}

sub parse_logfile {
    my $file   = shift;
    my $fid    = shift;
    my $offset = shift || 0;
    my $path   = "$logdir/$file";

    print "parsing file $file (id: $fid) from offset $offset\n";
    open my $F, '<', $path or die "could not open $path: $!";
    seek($F, $offset, 0) if $offset;

    while (defined(my $line = <$F>)) {
        chomp $line;
        next if !$line;
        my ($type, $pid, $hook, $plugin, $message) = parse_line($line);

        next if !$type;
        next if $type eq 'info';
        next if $type eq 'unknown';
        next if $type eq 'response';
        next if $type eq 'init';       # doesn't occur in all deployment models
        next if $type eq 'cleanup';
        next if $type eq 'error';

        my $ts = tai2unix((split /\s/, $line)[0]);    # print "ts: $ts\n";

        my $msg_id = get_msg_id($fid, $pid) or do {
            create_message($fid, $ts, $pid, $message) if $type eq 'connect';
            next;
        };

        #warn "type: $type\n";
        if ($type eq 'plugin') {
            next if $plugin eq 'naughty';             # housekeeping only
            next if $plugin eq 'karma' && 'karma adjust' eq substr($message,0,12);
            insert_plugin($msg_id, $plugin, $message);
        }
        elsif ($type eq 'queue') {
            exec_query('UPDATE message SET result=? WHERE id=?', [3, $msg_id]);
        }
        elsif ($type eq 'reject') {
            exec_query('UPDATE message SET result=? WHERE id=?', [-3, $msg_id]);
        }
        elsif ($type eq 'close') {
            if ($message eq 'Connection Timed Out') {
                exec_query('UPDATE message SET result=? WHERE id=?',
                           [-1, $msg_id]);
            }
        }
        elsif ($type eq 'connect') { }
        elsif ($type eq 'dispatch') {
            if (substr($message, 0, 21) eq 'dispatching MAIL FROM') {
                my ($from) = $message =~ /<(.*?)>/;
                exec_query('UPDATE message SET mail_from=? WHERE id=?',
                           [$from, $msg_id]);
            }
            elsif (substr($message, 0, 19) eq 'dispatching RCPT TO') {
                my ($to) = $message =~ /<(.*?)>/;
                exec_query(
'UPDATE message SET rcpt_to=? WHERE id=? AND rcpt_to IS NULL',
                    [$to, $msg_id]
                );
            }
            elsif ($message =~ m/dispatching (EHLO|HELO) (.*)/) {
                exec_query('UPDATE message SET helo=? WHERE id=?',
                           [$2, $msg_id]);
            }
            elsif ($message eq 'dispatching DATA')     { }
            elsif ($message eq 'dispatching QUIT')     { }
            elsif ($message eq 'dispatching STARTTLS') { }
            elsif ($message eq 'dispatching RSET')     { }
            else {
                # anything here is likely an unrecognized command
                #print "$message\n";
            }
        }
        else {
            print "$type $pid $hook $plugin $message\n";
        }
    }

    close $F;
}

sub check_logfile {
    my $file = shift;
    my $path = "$logdir/$file";

    die "missing file $logdir/$file" if !-f "$logdir/$file";

    my $inode = stat($path)->ino  or die "unable to get inode for $path\n";
    my $size  = stat($path)->size or die "unable to get size for $path\n";
    my $exists;

    #warn "check if file $file is in the DB as 'current'\n";
    if ($file =~ /^\@/) {
        $exists = exec_query('SELECT * FROM log WHERE inode=? AND name=?',
                             [$inode, 'current']);
        if (@$exists) {
            print "Updating current -> $file\n";
            exec_query('UPDATE log SET name=? WHERE inode=? AND name=?',
                       [$file, $inode, 'current']);
            return $exists->[0]{id}, $exists->[0]{size};    # continue parsing
        }
    }

    if ($file eq 'current') {
        $exists = exec_query('SELECT * FROM log WHERE inode=? AND name=?',
                             [$inode, $file]);
        if (@$exists) {
            exec_query('UPDATE log SET size=? WHERE inode=? AND name=?',
                       [$size, $inode, 'current']);
            return $exists->[0]{id}, $exists->[0]{size};    # continue parsing
        }
    }

    $exists =
      exec_query('SELECT * FROM log WHERE name=? AND size=?', [$file, $size]);
    return if @$exists;    # log file hasn't changed, ignore it
                           #print Dumper($exists);

    # file is a new one we haven't seen, add to DB and parse
    my $id = exec_query(
        'INSERT INTO log SET inode=?, size=?, name=?, created=FROM_UNIXTIME(?)',
        [$inode, $size, $file, stat($path)->ctime]
    );
    print "new file id: $id\n";
    return $id;
}

sub get_log_dir {

    if (-d "log/main") {
        my $wd = Cwd::cwd();
        return "$wd/log/main";
    }

    foreach my $user (qw/ qpsmtpd smtpd /) {

        my ($homedir) = (getpwnam($user))[7] or next;

        if (-d "$homedir/log") {
            return "$homedir/log/main";
        }
        if (-d "$homedir/smtpd/log") {
            return "$homedir/smtpd/log/main";
        }
    }

}

sub get_logfiles {
    my $dir = shift;

    opendir my $D, $dir or die "unable to open log dir $dir\n";

    my @files;
    while (defined(my $f = readdir($D))) {
        next if !-f "$dir/$f";    # ignore anything that's not a file
        if ($f =~ /^\@.*s$/) {
            push @files, $f;
        }
    }
    push @files, "current";       # always have this one last

    closedir $D;
    return @files;
}

sub parse_line {
    my $line = shift;
    my ($tai, $pid, $message) = split /\s+/, $line, 3;
    return if !$message;          # garbage in the log file

    # lines seen many times per connection
    return parse_line_plugin($line) if substr($message, 0, 1) eq '(';
    return 'dispatch', $pid, undef, undef, $message
      if substr($message, 0, 12) eq 'dispatching ';
    return 'queue', $pid, undef, undef, $message
      if substr($message, 0, 11) eq '250 Queued!';
    return 'response', $pid, undef, undef, $message
      if $message =~ /^[2|3]\d\d/;

    # lines seen about once per connection
    return 'init', $pid, undef, undef, $message
      if substr($message, 0, 19) eq 'Accepted connection';
    return 'connect', $pid, undef, undef, substr($message, 16)
      if substr($message, 0, 15) eq 'Connection from';
    return 'connect', $pid, undef, undef, substr($message, 16)
      if substr($message, 0, 8) eq 'connect ';
    return 'close', $pid, undef, undef, $message
      if substr($message, 0, 6) eq 'close ';
    return 'close', $pid, undef, undef, $message
      if $message eq 'Connection Timed Out';
    return 'close', $pid, undef, undef, $message
      if substr($message, 0, 20) eq 'click, disconnecting';
    return parse_line_cleanup($line)
      if substr($message, 0, 11) eq 'cleaning up';

    # lines seen less than once per connection
    return 'info', $pid, undef, undef, $message
      if $message eq 'spooling message to disk';
    return 'reject', $pid, undef, undef, $message
      if $message =~ /^[4|5]\d\d/;
    return 'reject', $pid, undef, undef, $message
      if substr($message, 0, 14) eq 'deny mail from';
    return 'reject', $pid, undef, undef, $message
      if substr($message, 0, 18) eq 'denysoft mail from';
    return 'info', $pid, undef, undef, $message
      if substr($message, 0, 15) eq 'Lost connection';
    return 'info', $pid, undef, undef, $message
      if $message eq 'auth success cleared naughty';
    return 'info', $pid, undef, undef, $message
      if substr($message, 0, 15) eq 'Running as user';
    return 'info', $pid, undef, undef, $message
      if substr($message, 0, 16) eq 'Loaded Qpsmtpd::';
    return 'info', $pid, undef, undef, $message
      if substr($message, 0, 24) eq 'Permissions on spool_dir';
    return 'info', $pid, undef, undef, $message
      if substr($message, 0, 13) eq 'Listening on ';
    return 'info', $pid, undef, undef, $message
      if substr($message, 0, 18) eq 'size_threshold set';
    return 'info', $pid, undef, undef, $message
      if substr($message, 0, 12) eq 'tls: ciphers';
    return 'error', $pid, undef, undef, $message
      if substr($message, 0, 22) eq 'of uninitialized value';
    return 'error', $pid, undef, undef, $message
      if substr($message, 0, 8) eq 'symbol "';
    return 'error', $pid, undef, undef, $message
      if substr($message, 0, 9) eq 'error at ';
    return 'error', $pid, undef, undef, $message
      if substr($message, 0, 15) eq 'Could not print';

    print "UNKNOWN LINE: $line\n";
    return 'unknown', $pid, undef, undef, $message;
}

sub parse_line_plugin {
    my ($line) = @_;

# @tai 13486 (connect) ident::p0f: Windows (XP/2000 (RFC1323+, w, tstamp-))
# @tai 13681 (connect) dnsbl: fail, NAUGHTY
# @tai 15787 (connect) karma: pass, no penalty (0 naughty, 3 nice, 3 connects)
# @tai 27500 (queue) queue::qmail_2dqueue: (for 27481) Queuing to /var/qmail/bin/qmail-queue
    my ($tai, $pid, $hook, $plugin, $message) = split /\s/, $line, 5;
    $plugin =~ s/:$//;

    return parse_line_plugin_p0f($line)          if $plugin =~ /^ident::p0f/;
    return parse_line_plugin_dspam($line)        if $plugin =~ /^dspam/;
    return parse_line_plugin_spamassassin($line) if $plugin =~ /^spamassassin/;

    if ($plugin eq 'sender_permitted_from') {
        $message = 'pass' if $message =~ /^pass/;
        $message = 'fail' if $message =~ /^fail/;
        $message = 'skip' if $message =~ /^none/;
    }
    elsif ($plugin eq 'queue::qmail_2dqueue') {
        ($pid) = $message =~ /\(for ([\d]+)\)/;
        $message = 'pass' if $message =~ /Queuing/;
    }
    elsif ($plugin =~ /(?:early|karma|helo|rcpt_ok)/) {
        $message = 'pass' if $message =~ /^pass/;
    }
    elsif ($plugin =~ /resolvable_fromhost/) {
        $message = 'pass' if $message =~ /^pass/;
    }

    return 'plugin', $pid, $hook, $plugin, $message;
}

sub parse_line_plugin_dspam {
    my $line = shift;

    my ($tai, $pid, $hook, $plugin, $message) = split /\s/, $line, 5;
    $plugin =~ s/:$//;

    if ($message =~ /Innocent, (\d\.\d\d c)/) {
        $message = "pass, $1";
    }
    if ($message =~ /Spam, (\d\.\d\d c)/) {
        $message = "fail, $1";
    }

    return 'plugin', $pid, $hook, $plugin, $message;
}

sub parse_line_plugin_spamassassin {
    my $line = shift;

    my ($tai, $pid, $hook, $plugin, $message) = split /\s/, $line, 5;
    $plugin =~ s/:$//;

    if ($message =~ /pass, Ham, ([\d\-\.]+)\s/) {
        $message = "pass, $1";
    }
    if ($message =~ /^fail, Spam,\s([\d\.]+)\s< 100/) {
        $message = "fail, $1";
    }

    return 'plugin', $pid, $hook, $plugin, $message;
}

sub parse_line_plugin_p0f {
    my $line = shift;

    my ($tai, $pid, $hook, $plugin, $message) = split /\s/, $line, 5;
    $plugin =~ s/:$//;

    if (substr($message, -5, 5) eq 'hops)') {
        ($message) = split(/\s\(/, $message);
    }

    $message = 'iOS'            if $message =~ /^iOS/;
    $message = 'Solaris'        if $message =~ /^Solaris/;
    $message = 'Mac OS X'       if $message =~ /^Mac OS X/;
    $message = 'FreeBSD'        if $message =~ /^FreeBSD/;
    $message = 'Linux'          if $message =~ /^Linux/;
    $message = 'OpenBSD'        if $message =~ /^OpenBSD/;
    $message = 'Windows NT'     if $message =~ /^Windows \(?NT/;
    $message = 'Windows 95'     if $message =~ /^Windows \(?95/;
    $message = 'Windows 98'     if $message =~ /^Windows \(?98/;
    $message = 'Windows XP'     if $message =~ /^Windows \(?XP/;
    $message = 'Windows 2000'   if $message =~ /^Windows \(?2000/;
    $message = 'Windows 2003'   if $message =~ /^Windows \(?2003/;
    $message = 'Windows 7 or 8' if $message =~ /^Windows 7/;
    $message = 'Windows 7 or 8' if $message =~ /^Windows 8/;
    $message = 'Google'         if $message =~ /^Google/;
    $message = 'HP-UX'          if $message =~ /^HP\-UX/;
    $message = 'NetCache'       if $message =~ /^NetCache/i;
    $message = 'Cisco'          if $message =~ /^Cisco/i;
    $message = 'Netware'        if $message =~ /Netware/i;

    return 'plugin', $pid, $hook, $plugin, $message;
}

sub parse_line_cleanup {
    my ($line) = @_;

    # @tai 85931 cleaning up after 3210
    my $pid = (split /\s+/, $line)[-1];
    $has_cleanup++;
    return 'cleanup', $pid, undef, undef, $line;
}

sub get_score {
    my $mess = shift;
    return 3  if $mess eq 'TLS setup returning';
    return 3  if $mess =~ /^pass/;
    return -3 if $mess =~ /^fail/;
    return -2 if $mess =~ /^negative/;
    return 2  if $mess =~ /^positive/;
    return 1  if $mess =~ /^skip/;
    return 0;
}

sub get_db {

    my %dbv = get_config('log2sql');

    $dbv{dsn}  ||= 'DBI:mysql:database=qpsmtpd;host=db;port=3306';
    $dbv{user} ||= 'qplog';
    $dbv{pass} ||= 't0ps3cret';

    print Dumper(\%dbv);
    my $db = DBIx::Simple->connect($dbv{dsn}, $dbv{user}, $dbv{pass})
      or die DBIx::Simple->error;

    return $db;
}

sub get_config {
    my $file = shift or die "missing file name\n";
    my %values;
    foreach my $line ( get_config_contents( $file ) ) {
        next if $line =~ /^#/;
        chomp $line;
        my ($key,$val) = split /\s*=\s*/, $line, 2;
        $values{$key} = $val;
    };
    return %values;
};

sub get_config_contents {
    my $name = shift;

    my @config_dirs = qw[ config ../config log plugins ];
    foreach my $dir ( @config_dirs ) {
        next if ! -f "$dir/$name";

        my $fh = IO::File->new();
        if ( ! $fh->open( "$dir/$name", '<' ) ) {
            warn "unable to open config file $dir/$name\n";
            next;
        };
        my @contents = <$fh>;
        return @contents;
    };
};

sub check_plugins_table {
    my $rows = exec_query( 'SELECT COUNT(*) FROM plugin');
    return if scalar @$rows != 0;
    my @lines = get_config_contents('registry.txt');
    foreach my $line ( @lines ) {
        next if $line =~ /^\s*#/;  # ignore comments
        chomp $line;
        next if ! $line;
        my ($id, $name, $abb3, $abb5, $aliases) = split /\s+/, $line, 5;
        my $q = "REPLACE INTO plugin (id,name,abb3,abb5) VALUES (??)";
        print "query: $q, $id, $name, $abb3, $abb5\n";
        exec_query($q, [$id, $name, $abb3, $abb5 ]);
        next if ! $aliases;
        foreach my $alias ( split /\s*,\s*/, $aliases ) {
            next if ! $alias;
            my $aq = "REPLACE INTO plugin_aliases (plugin_id,name) VALUES (??)";
            print "aqury: $aq, $id, $alias\n";
            exec_query($aq, [$id, $alias]);
        };
    };
};

sub exec_query {
    my $query  = shift;
    my $params = shift;
    die "invalid arguments to exec_query!" if @_;
    my @params;
    if (defined $params) {
        @params = ref $params eq 'ARRAY' ? @$params : $params;
    }

    my $err = "query failed: $query\n";
    if (scalar @params) {
        $err .= join(',', @params);
    }

    #warn "err: $err\n";
    if ($query =~ /(?:REPLACE|INSERT) INTO/) {
        my ($table) = $query =~ /(?:REPLACE|INSERT) INTO (\w+)\s/;
        $db->query($query, @params);
        warn "$db->error\n$err" if $db->error ne 'DBI error: ';
        return if $query =~ /^REPLACE/;
        my $id = $db->last_insert_id(undef, undef, $table, undef) or die $err;
        return $id;
    }
    elsif ($query =~ /^UPDATE/i) {
        return $db->query($query, @params);
    }
    elsif ($query =~ /DELETE/) {
        $db->query($query, @params) or die $err;
        return $db->query("SELECT ROW_COUNT()")->list;
    }

    my $r = $db->query($query, @params)->hashes or die $err;
    return $r;
}