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#!/usr/bin/perl
##
##  radsqlrelay.pl	This program tails a SQL logfile and forwards
##			the queries to a database server. Used to
##			replicate accounting records to one (central)
##			database, even if the database has extended
##			downtime.
##
##  Version:    $Id$
##
##  Author:     Nicolas Baradakis <nicolas.baradakis@cegetel.net>
##
##  Copyright (C) 2005 Cegetel
##
##  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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
##

use DBI;
use Fcntl;
use Getopt::Std;
use POSIX qw(:unistd_h :errno_h);

use warnings;
use strict;

my $need_exit = 0;

sub got_signal()
{
    $need_exit = 1;
}

# /!\ OS-dependent structure
# Linux struct flock
#   short l_type;
#   short l_whence;
#   off_t l_start;
#   off_t l_len;
#   pid_t l_pid;
# c2ph says: typedef='s2 l2 i', sizeof=16
my $FLOCK_STRUCT = 's2l2i';

sub setlock($;$$)
{
    my ($fh, $start, $len) = @_;
    $start = 0 unless defined $start;
    $len = 0 unless defined $len;

                                    #type     whence    start   till  pid
    my $packed = pack($FLOCK_STRUCT, F_WRLCK, SEEK_SET, $start, $len, 0);
    if (fcntl($fh, F_SETLKW, $packed)) { return 1 }
    else { return 0 }
}

sub usage()
{
    print STDERR <<HERE;
usage: radsqlrelay [options] file_path
options:
	-?		Print this help message.
	-1		One-shot mode: push the file to database and exit.
	-b database	Name of the database to use.
	-d sql_driver	Driver to use: mysql, pg, oracle.
	-f file		Read password from file, instead of command line.
	-h host		Connect to host.
	-P port		Port number to use for connection.
	-p passord	Password to use when connecting to server.
	-u user		User for login.
	-x		Turn on debugging.
HERE
}

sub connect_wait($)
{
    my $dbinfo = shift;
    my $dbh;
    while (!$dbh) {
	$dbh = DBI->connect($dbinfo->{base}, $dbinfo->{user}, $dbinfo->{pass},
			    { RaiseError => 0, PrintError => 0,
			      AutoCommit => 1 });
	sleep (1) if !$dbh;
	exit if $need_exit;
    }
    $dbinfo->{handle} = $dbh;
}

sub process_file($$)
{
    my ($dbinfo, $path) = @_;

    unless (-e $path.'.work') {
	until (rename($path, $path.'.work')) {
	    if ($! == ENOENT) {
		sleep(1);
		return if $need_exit;
	    } else {
		print STDERR "error: Couldn't move $path to $path.work: $!\n";
		exit 1;
	    }
	}
    }

    open(FILE, "+< $path.work") or die "error: Couldn't open $path.work: $!\n";
    setlock(\*FILE) or die "error: Couldn't lock $path.work: $!\n";

    while (<FILE>) {
	chomp(my $query = $_);
	until ($dbinfo->{handle}->do($query)) {
	    print $dbinfo->{handle}->errstr."\n";
	    if ($dbinfo->{handle}->ping) {
		sleep (1);
	    } else {
		print "error: Lost connection to database\n";
		$dbinfo->{handle}->disconnect;
		connect_wait($dbinfo);
	    }
	}
    }

    unlink($path.'.work');
    close(FILE); # and unlock
}

# sub main()

my %args = (
	    b => 'radius',
	    d => 'mysql',
	    h => 'localhost',
	    p => 'radius',
	    u => 'radius',
);
my $ret = getopts("b:d:f:h:P:p:u:x1?", \%args);
if (!$ret or @ARGV != 1) {
    usage();
    exit 1;
}
if ($args{'?'}) {
    usage();
    exit 0;
}

my $data_source;
if (lc($args{d}) eq 'mysql') {
    $data_source = "DBI:mysql:database=$args{b};host=$args{h}";
} elsif (lc($args{d}) eq 'pg') {
    $data_source = "DBI:Pg:dbname=$args{b};host=$args{h}";
} elsif (lc($args{d}) eq 'oracle') {
    $data_source = "DBI:Oracle:$args{b}";
} else {
    print STDERR "error: SQL driver not supported yet: $args{d}\n";
    exit 1;
}
$data_source .= ";port=$args{P}" if $args{'P'};

my $pw;
if($args{f}) {
    open(FILE, "< $args{f}") or die "error: Couldn't open $args{f}: $!\n";
    $pw = <FILE>;
    chomp($pw);
    close(FILE);
} else {
    # args{p} is always defined.
    $pw = $args{p};
}

$SIG{INT} = \&got_signal;
$SIG{TERM} = \&got_signal;

my %dbinfo = (
	      base => $data_source,
	      user => $args{u},
	      pass => $pw,
);
connect_wait(\%dbinfo);

my $path = shift @ARGV;

until ($need_exit) {
    process_file(\%dbinfo, $path);
    last if ($args{1} || $need_exit);
    sleep(10);
}

$dbinfo{handle}->disconnect;