#! /usr/bin/perl
#
#   simple fbox recovery tool
#
#   Copyright (C) 2004,2005 Enrik Berkhan <enrik.berkhan@inka.de>
#   Copyright (C) 2006 Daniel Eiband <eiband@online.de>
#
#   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 IO::Socket::INET;
use IO::Select;
use Socket;
use Getopt::Std;
use Errno qw(EEXIST);
use Net::FTP;
use Fcntl qw(SEEK_END SEEK_SET);

my $do_crc = 1;
BEGIN {
	eval { require Compress::Zlib };
	if ($@) {
		eval { require String::CRC32 };
		if ($@) {
			print STDERR "No crc32() implementation available!\nInstall Compress::Zlib or String::CRC32 if you want CRC support.\n";
			$do_crc = 0;
		} else {
			import String::CRC32 qw(crc32);
		}
	} else {
		import Compress::Zlib qw(crc32);
	}
}

use warnings;

$| = 1;

my %opt;
getopts('hrf:i:l:s:u', \%opt);

if ($opt{h}) {
	print "usage: recover -h\n";
	print "       recover [-l IPADDR] [-i IPADDR] [-f firmeware.image] [-r]\n";
	print "       recover [-l IPADDR] [-i IPADDR] -s image\n";
	print "       recover [-l IPADDR] [-i IPADDR] -u\n";
	print "       -i IPADDR: set boot time IP to IPADDR within environment\n";
	print "       -l IPADDR: choose local addr (for multihomed)\n";
	print "       -f image:  extract fs and kernel from tarfile and flash\n";
	print "       -s image:  boot (standalone) image directly from RAM\n";
	print "       -r:        reboot fbox\n";
	print "       -u:        update box with filesystem.img, kernel.img from cwd\n";
	exit;
}

my $ipaddr;
my $setip;
if ($opt{i}) {
	$setip = unpack("N", inet_aton($opt{i}));
} else {
	$setip = 0;
}

$opt{l} = "0.0.0.0" unless defined $opt{l};
my $probe = IO::Socket::INET->new(Proto => 'udp',
									Broadcast => 1,
									LocalAddr => $opt{l},
									LocalPort => 5035) or die "socket: $!";
my $sel = IO::Select->new($probe);
my $packet = pack("vCCVNV", 0, 18, 1, 1, 0, 0);
my $broadcast = sockaddr_in(5035, INADDR_BROADCAST);

$probe->send($packet, 0, $broadcast);

scan_again:
print "Looking for Fritz!Box ";
@boxes = ();
$scanning = 10;
print "o";
while($scanning) {
	my $reply;
	my @ready;

	if (@ready = $sel->can_read(0.2)) {
		$peer = $probe->recv($reply, 16);
		next if (length($reply) < 16);
		my ($port, $addr) = sockaddr_in($peer);
		my ($major, $minor1, $minor2, $code, $addr2) = unpack("vCCVV", $reply);
		$addr2 = pack("N", $addr2);
		if ($code == 2) {
			print "O";
			push @boxes, [$major, $minor1, $minor2, $addr, $addr2];
			$scanning = 2 if ($scanning > 2);
		}
	} else {
		$scanning--;
		if (scalar @boxes == 0) {
			$probe->send($packet, 0, $broadcast);
			print "o";
		} else {
			print ".";
		}
	}
}

if (scalar @boxes == 0) {
	print " none found, giving up.\n";
	exit 1;
} else {
	print " found!\n";
}

foreach $box (@boxes) {
	my ($major, $minor1, $minor2, $addr, $addr2) = @$box;
	printf "ADAM2 version $major.$minor1.$minor2 at %s (%s)\n",
				 inet_ntoa($addr), inet_ntoa($addr2);
}

if (scalar @boxes > 1) {
	print "more than one boxes: no work\n";
	exit 1;
}

$ipaddr = (@{$boxes[0]})[4];
if (!$ipaddr && !$setip) {
	print "box has no ip, giving up\n";
	exit 1;
}

if ($setip) {
	if ($setip != unpack('N', $ipaddr)) {
		print "setting ip address\n";
		my $setpacket = pack("vCCVNV", 0, 18, 1, 1, $setip, 0);
		$probe->send($setpacket, 0, $broadcast);
		goto scan_again;
	} else {
		print "ip already ok\n";
	}
}

{
	package ADAM2FTP;
	use base qw(Net::FTP);
	# ADAM2 requires upper case commands, some brain dead firewall doesn't ;-)
	sub _USER { shift->command("USER",@_)->response() }
	sub _PASV { shift->command("P\@SW")->response() == Net::FTP::CMD_OK }
	sub _GETENV {
		my $ftp = shift;
		my ($ok, $name, $value);

		$ftp->command("GETENV",@_);
		while(length($ok = $ftp->response()) < 1) {
			my $line = $ftp->getline();
			unless (defined($value)) {
				chomp($line);
				($name, $value) = split(/\s+/, $line, 2);
			}
		}
		$ftp->debug_print(0, "getenv: $value\n")
			if $ftp->debug();
		return $value;
	}
	sub getenv {
		my $ftp = shift;
		my $name = shift;
		return $ftp->_GETENV($name);
	}
	sub _REBOOT { shift->command("REBOOT")->response() == Net::FTP::CMD_OK }
	sub reboot {
		my $ftp = shift;
		$ftp->_REBOOT;
		$ftp->close;
	}
	sub check {
		my $ftp = shift;
		
		delete ${*$ftp}{'net_ftp_port'};
		delete ${*$ftp}{'net_ftp_pasv'};

		my $data = $ftp->_data_cmd('CHECK' ,@_) or return undef;
		my $sum;
		if (${${*$ftp}{'net_cmd_resp'}}[0] =~ /^Flash check 0x([0-9A-F]{8})/) {
			$sum = hex($1);
		}
		$data->_close();
		return $sum;
	}
}

# passive mode geht mit Net::FTP nicht, connected zu spaet fuer ADAM2!
$ftp = ADAM2FTP->new(inet_ntoa($ipaddr), Passive => 0, Debug => 0, Timeout => 600)
	or die "can't FTP ADAM2";
$ftp->login("adam2", "adam2") or die "can't login adam2";
$ftp->binary();
my $pid   = $ftp->getenv('ProductID');
my $hwrev = $ftp->getenv('HWRevision');
my $fwrev = $ftp->getenv('firmware_info');
my $ulrev = $ftp->getenv('urlader-version');

print "Product ID: $pid\n";
print "Hardware Revision: $hwrev\n";
print "Urlader  Revision: $ulrev\n";
print "Firmware Revision: $fwrev\n";

$ftp->hash(\*STDOUT, 64 * 1024);

$mtd0 = "filesystem.image";
$mtd1 = "kernel.image";

if ($opt{f}) {
	unless (-f $opt{f}) {
		die "$opt{f} not found\n";
	}
	mkdir "recover.tmp";
	if ($! && $! != EEXIST) { die "recover.tmp: $!" };
	
	my $tar = "tools/tar";
	system("$tar xf $opt{f} -C recover.tmp ./var/tmp/kernel.image ./var/tmp/filesystem.image");
	if ($? >> 8) {
		die "$tar failed";
	} elsif ($? & 127) {
		die "$tar killed";
	}
	chmod 0644, "recover.tmp/var/tmp/filesystem.image",
							"recover.tmp/var/tmp/kernel.image";

	$mtd0 = "recover.tmp/var/tmp/filesystem.image";
	$mtd1 = "recover.tmp/var/tmp/kernel.image";
}

if ($opt{f} || $opt{u}) {

	$ftp->quot("MEDIA", "FLSH");

if (-f $mtd0) {
	$sum = remove_cksum($mtd0, 0x300000);
	$opt{r} = 1;
	print "Flashing $mtd0 to mtd0 ...";
	$ftp->put($mtd0, "1 mtd0");
	if ($ftp->status() == $ftp->CMD_OK) {
		if (defined $sum) {
			my $flashsum = $ftp->check("1 mtd0");
			if (defined $flashsum && $sum eq $flashsum) {
				print "checksum ok!\n";
			} else {
				print "checksum bad!\n";
			}
		}
		print "success!\n";
	} else {
		print "FAILED: ", $ftp->code(), " ", $ftp->message(), "\n";
		$opt{r} = 0;
	}
}

if (-f $mtd1) {
	$sum = remove_cksum($mtd1, 0xb0000);
	print "Flashing $mtd1 to mtd1 ...";
	$ftp->put($mtd1, "1 mtd1");
	if ($ftp->status() == $ftp->CMD_OK) {
		if (defined $sum) {
			my $flashsum = $ftp->check("1 mtd1");
			if (defined $flashsum && $sum eq $flashsum) {
				print "checksum ok!\n";
			} else {
				print "checksum bad!\n";
			}
		}
		print "success!\n";
	} else {
		print "FAILED: ", $ftp->code(), " ", $ftp->message(), "\n";
		$opt{r} = 0;
	}
}

} elsif ($opt{s}) {
	print "Sending and booting $opt{s}...";
	$ftp->quot("MEDIA", "SDRAM");
	$ftp->put("$opt{s}", "1 mtd4");
	if ($ftp->status() == $ftp->CMD_OK) {
		print "success!\n";
		$ftp->close();
		exit;
	} else {
		print "FAILED: ", $ftp->code(), " ", $ftp->message(), "\n";
		$opt{r} = 0;
	}
}

if ($opt{r}) {
	print "Rebooting...\n";
	$ftp->reboot();
} else {
	$ftp->quit();
}

END {
	if ($opt{f}) {
		unlink("recover.tmp/var/tmp/kernel.image");
		unlink("recover.tmp/var/tmp/filesystem.image");
		rmdir("recover.tmp/var/tmp");
		rmdir("recover.tmp/var");
		rmdir("recover.tmp");
	}
}

sub remove_cksum {
	my $name = shift;
	my $mtdsize = shift;
	
	open F, "+<$name" or die "open: $!";
	$size = (stat F)[7];
	die "stat: $!" unless defined($size);
	if ($size >= 8) {
		seek F, -8, SEEK_END or die "seek: $!";
		read F, $magic, 4;
		read F, $chksum, 4;
		if (unpack("V", $magic) == 0xC453DE23) {
			$size -= 8;
			truncate F, $size or die "truncate: $!";
			print "$name: removed checksum\n";
		} else {
			print "$name: no checksum\n";
		}
		seek F, 0, SEEK_SET or die "seek: $!";
		$chksum = crc32(*F);
		$chksum = crc32("\xff" x ($mtdsize - $size), $chksum);
		printf "CRC32: %08X\n", $chksum;
		return $chksum;
	}
	return undef;
}