#!/usr/bin/perl
use Net::Ping;
#hosts.txt example:
#hostA /boot:boot /etc:etc
#hostB /boot:boot /etc:etc /usr/local:usrlocal

$backup_dir = "/backup";

&main;
sub main {
	&begin;
	$host_file = "<$backup_dir/hosts.txt";
	open HOSTS, $host_file;
	while (<HOSTS>) {
		#get a list of hosts from first field in hosts.txt
		@entry = split(/ /, $_);
		$host = @entry[0];
		chomp $host;
		# Check if host is alive
		unless (&host_up($host)) {
			printf "\n%2s %15s %10s %-10s\n", " ", "Host:", "\'$host\'", "is up.";
			printf "%2s %15s\n", " ", "Proceeding:";
			@entry = reverse(@entry);
			pop @entry;
			mkdir "$backup_dir";
			mkdir "$backup_dir/$host";
			mkdir "$backup_dir/$host/live";
			foreach (@entry) {
				@single = split(/:/, $_);
				$dir = $single[0];
				$file = $single[1];
				printf "%7s %20s", " ", "$dir:";
				if (&pullit($host, $dir, $backup_dir, $file)) {
					printf "%10s\n", "Fail";
				} else { 
					printf "%10s\n", "Success";
				}
			}
		}
	}
	&end;
}


sub pullit {
	my $host = $_[0];
	my $rem_dir = $_[1];
	my $loc_dir = $_[2];
	my $file = $_[3];
	chomp($file); chomp($host); chomp($rem_dir); chomp($loc_dir);
	system("rsync",
		"--delete", 
		"-apce", 
		"ssh", 
		"$host:$rem_dir/", 
		"$loc_dir/$host/live/$file");
}


sub host_up {
	my $host = $_[0];
	chomp $host;
	$p = Net::Ping->new("icmp");
	if ($p->ping("$host")) { $p->close(); return 0;	} else { $p->close(); return 1; }
}


sub begin {
	print "\n\n";
	printf "%2s %10s\n", " ", "###################";
	printf "%2s %10s\n", " ", "## S Y N C I N G ##";
	printf "%2s %10s\n", " ", "##  R E M O T E  ##";
	printf "%2s %10s\n", " ", "## B A C K U P S ##";
	printf "%2s %10s\n", " ", "###################";
}


sub end {
	print "\n\n";
}