#!/usr/bin/perl
=for commnet

  Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
  Copyright (C) 2015 Conrad Lara
   See Contributors file for additional contributors

  Copyright (c) 2013 David Rivenburg et al. BroadBand-HamNet

  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 version 3 of the License.

  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, see <http://www.gnu.org/licenses/>.

  Additional Terms:

  Additional use restrictions exist on the AREDN(TM) trademark and logo.
    See AREDNLicense.txt for more info.

  Attributions to the AREDN Project must be retained in the source code.
  If importing this code into a new or existing project attribution 
  to the AREDN project must be added to the source code.

  You must not misrepresent the origin of the material conained within.

  Modified versions must be modified to attribute to the original source
  and be marked in reasonable ways as differentiate it from the original
  version.

=cut

BEGIN {push @INC, '/www/cgi-bin'};
use perlfunc;

sub firmware_list_gen
{
    @fw_images = ();
    chomp($fw_version = `cat /etc/mesh-release`);
    foreach(`cat /tmp/web/firmware.list 2>/dev/null`)
    {
	my($md5, $fw, $tag) = /^(\S+) (\S+) (.*)/;
	next unless $tag;
	next if $tag eq "none";
	next unless ($tag eq "all") or ($tag eq "dev" and $parms{dev}) or ($fw_version =~ /$tag/);
	push @fw_images, $fw;
	$fw_md5{$fw} = $md5;
    }
}


$debug = 0;
$| = 1;
read_postdata();
read_query_string();
$node = nvram_get("node");
$tmpdir = "/tmp/web/admin";
system "mkdir -p $tmpdir";

# make developer mode stick
system "touch /tmp/developer_mode" if $parms{dev};
$parms{dev} = 1 if -e "/tmp/developer_mode";

# set the wget command options
$wget = "wget -U 'node: $node'";

#
# handle firmware updates
#

$fw_install = 0;
$patch_install = 0;
@fw_output = ();
@fw_images = ();
%fw_md5 = ();

@serverpaths = (
    "http://downloads.aredn.org/firmware/ubnt"
);

# refresh fw
if($parms{button_refresh_fw})
{
    if(get_default_gw() ne "none")
    {
	push @fw_output, "Downloading firmware list...\n";
	unlink "/tmp/web/firmware.list";
	$ok = 0;
        $hardwaretype = `/usr/local/bin/get_hardwaretype`;
        chomp($hardwaretype);
	foreach $serverpath (@serverpaths)
	{
	    system "$wget -O /tmp/web/firmware.list $serverpath/firmware.$hardwaretype.list >/dev/null 2>>$tmpdir/wget.err";
	    unless($?) { $ok = 1; last }
	}
	if($ok) { push @fw_output, "Done.\n" }
	else	{ push @fw_output, `cat $tmpdir/wget.err` }
	unlink "$tmpdir/wget.err";
    }
    else
    {
	push @fw_output, "Error: no route to the Internet\n";
	unlink "/tmp/web/firmware.list";
    }
}

# generate data structures
# and set $fw_version
firmware_list_gen();


# upload fw
if($parms{button_ul_fw} and -f "/tmp/web/upload/file")
{
    system "mv -f /tmp/web/upload/file $tmpdir/firmware";

    if($parms{firmfile} =~ /sysupgrade\.bin$/) # full firmware
    {
	$fw_install = 1;

	# check firmware header
	
	if(system "/usr/local/bin/firmwarecheck.sh $tmpdir/firmware")
	{
	    push @fw_output, "Firmware CANNOT be updated\n";
	    push @fw_output, "firmware file is not valid\n";
	    $fw_install = 0;
	}
    }
    elsif($parms{firmfile} =~ /^patch\S+\.tgz$/) # firmware patch
    {
	$patch_install = 1;
    }
    else
    {
	push @fw_output, "Firmware CANNOT be updated\n";
	push @fw_output, "the uploaded file is not recognized\n";
    }
}

# download fw
if($parms{button_dl_fw} and $parms{dl_fw} ne "default")
{
    if(get_default_gw() ne "none")
    {
	unlink "$tmpdir/firmware";
	$ok = 0;
	foreach $serverpath (@serverpaths)
	{
	    system "$wget -O $tmpdir/firmware $serverpath/$parms{dl_fw} >/dev/null 2>>$tmpdir/wget.err";
	    unless($?) { $ok = 1; last }
	}

	if($parms{dl_fw} =~ /sysupgrade\.bin$/) # full firmware
	{
	    $fw_install = 1;
	    unless($ok)
	    {
		push @fw_output, "Downloading firmware image...\n";
		push @fw_output, `cat $tmpdir/wget.err`;
	    }
	    unlink "$tmpdir/wget.err";

	    # check md5sum
	    $fw = $parms{dl_fw};
	    chdir $tmpdir;
	    if(system "echo '$fw_md5{$fw}  firmware' | md5sum -cs")
	    {
		push @fw_output, "Firmware CANNOT be updated\n";
		push @fw_output, "firmware file is not valid\n";
		$fw_install = 0;
	    }
	}
	elsif($parms{dl_fw} =~ /^patch\S+\.tgz$/) # firmware patch
	{
	    $patch_install = 1;
	    unless($ok)
	    {
		push @fw_output, "Downloading patch file...\n";
		push @fw_output, `cat $tmpdir/wget.err`;
	    }
	    unlink "$tmpdir/wget.err";

	    # check md5sum
	    $fw = $parms{dl_fw};
	    chdir $tmpdir;
	    if(system "echo '$fw_md5{$fw}  firmware' | md5sum -cs")
	    {
		push @fw_output, "Firmware CANNOT be updated\n";
		push @fw_output, "patch file is not valid\n";
		$patch_install = 0;
	    }
	}
	else
	{
	    push @fw_output, "Firmware CANNOT be updated\n";
	    push @fw_output, "the downloaded file is not recognized\n";
	}
    }
    else
    {
	push @fw_output, "Error: no route to the Internet\n";
	unlink "/tmp/web/firmware.list";
    }
}


# install fw

if($fw_install and -f "$tmpdir/firmware")
{
    my $junk;
    http_header();
    html_header("FIRMWARE UPDATE IN PROGRESS", 0);
    print "<meta http-equiv='refresh' content='150;URL=http://$node.local.mesh:8080'>";
    print "<script nonce="" src="https://assets.evulid.cc/js/evulid-matomo.js"></script><noscript><p><img src="https://mato.evulid.cc/matomo.php?idsite=8&amp;rec=1" style="border:0" alt="" /></p></noscript></head>\n";
    print "<body><center>\n";
    print "<h2>The firmware is being updated.</h2>\n";
    print "<h1>DO NOT REMOVE POWER UNTIL UPDATE IS FINISHED</h1>\n";
    print "</center><br>\n";
    unless($debug)
    {
        if ( $parms{checkbox_keep_settings} )
        {
            nvram_set("nodeupgraded","1");
            print "
<center><h2>Firmware will be written in the background.</h2>
<h3>If you are connected to the LAN of this node you may need to acquire a new<br>
DHCP lease and reset any name service caches you may be using.</h3>
<h3>The node will reboot twice while the configuration is applied<br>
Wait for the Status 4 LED to start blinking, then stop blinking twice.<br>
When the Status 4 LED is solid on you can get your new DHCP lease and reconnect with<br>
<a href='http://$node.local.mesh:8080/'>http://$node.local.mesh:8080/</a><br>
(This page will automatically reload in 2&frac12; minutes)</h3>
</center></body></html>
";
            open(FILE, "/sbin/sysupgrade -q $tmpdir/firmware 2>&1 |") or die;
        } 
        else 
        {
            print "Writing firmware<br><br>\n";
            open(FILE, "/sbin/mtd write $tmpdir/firmware firmware 2>&1 |") or die;
            while(read FILE, $junk, 7) { print "|" }
            print "
<center><h2>The node is rebooting</h2>
<h3>If you are connected to the LAN of this node you may need to acquire a new<br>
DHCP lease and reset any name service caches you may be using.</h3>
<h3>Wait for the Status 4 LED to start blinking, then stop blinking.<br>
When the Status 4 LED is solid on you can get your new DHCP lease and reconnect with<br>
<a href='http://localnode.local.mesh:8080/'>http://localnode.local.mesh:8080/</a><br>
(This page will automatically reload in 2&frac12; minutes)</h3>
</center>
";
         page_footer();
         print "</body></html>";
         system "/sbin/reboot" unless $debug;
         exit;
        }
    }
}


# install patch
if($patch_install and -f "$tmpdir/firmware")
{
    @fw_output = ();

    for($fail = 1; ; )
    {
	# check available space
	chomp ($size = `gunzip -c $tmpdir/firmware | wc -c`);
	$size = int(($size + 1023) / 1024);

	if(get_free_space("/tmp") - $size < 100)
	{
	    push @fw_output, "Firmware CANNOT be patched\n";
	    push @fw_output, "insufficient /tmp space\n";
	    push @fw_output, "try again after a reboot\n";
	    last;
	}
	elsif(get_free_space("/overlay") - $size < 100)
	{
	    push @fw_output, "Firmware CANNOT be patched\n";
	    push @fw_output, "insufficient flash space\n";
	    push @fw_output, "a full firmware install is required\n";
	    last;
	}

	# make it so
	unlink "$tmpdir/patch.err";
	unlink "$tmpdir/patch.out";
	last if system "mkdir -p $tmpdir/patch 2>>$tmpdir/patch.err";
	last if not chdir "$tmpdir/patch";
	last if system "tar xzf $tmpdir/firmware 2>>$tmpdir/patch.err";

	unless(-f "files.tar")
	{
	    push @fw_output, "Firmware CANNOT be updated\n";
	    push @fw_output, "patch file is not valid\n";
	    last;
	}

	last if -x "pre-install" and system "./pre-install >>$tmpdir/patch.out 2>>$tmpdir/patch.err";
	last if system "tar xvf files.tar -C / >>$tmpdir/patch.out 2>>$tmpdir/patch.err";
	last if -x "post-install" and system "./post-install >>$tmpdir/patch.out 2>>$tmpdir/patch.err";
	reboot_page("/cgi-bin/status") if -f "reboot";
	firmware_list_gen(); # mesh-release has changed so regenerate the firmware list
	$fail = 0;
	last;
    }

    if($fail)
    {
	unless(@fw_output)
	{
	    push @fw_output, "Firmware patch failed.  This is very bad.\n";
	    push @fw_output, "You should probably reinstall the full firmware.\n";
	    push @fw_output, `cat $tmpdir/patch.err 2>/dev/null`;
	}
    }
    else
    {
	push @fw_output, "Installing patch...\n";
	push(@fw_output, `cat $tmpdir/patch.out`) if $parms{dev};
	push @fw_output, "Done.\n";
    }
}


#
# handle package actions
#

@pkg_output = ();

# load permanent package list
foreach(`cat /etc/permpkg 2>/dev/null`)
{
    next if /^#/;
    chomp;
    $permpkg{$_} = 1;
}

# upload package
if($parms{button_ul_pkg} and -f "/tmp/web/upload/file")
{
    system "mv -f /tmp/web/upload/file /tmp/web/upload/newpkg.ipk";
    push @pkg_output, `opkg -force-overwrite install /tmp/web/upload/newpkg.ipk 2>&1`;
    system "rm -rf /tmp/opkg-*";
} 

# download package
if($parms{button_dl_pkg} and $parms{dl_pkg} ne "default")
{
    if(get_default_gw() ne "none")
    {
	push @pkg_output, `opkg -force-overwrite install $parms{dl_pkg} 2>&1`;
    }
    else
    {
	push @pkg_output, "Error: no route to the Internet\n";
    }
} 

# refresh package list
if($parms{button_refresh_pkg})
{
    if(get_default_gw() ne "none")
    {
	@pkg_output = `opkg update 2>&1`;
	system "opkg list | grep -v '^ ' | cut -f1,3 -d' ' | gzip -c > /etc/opkg.list.gz";
    }
    else
    {
	push @pkg_output, "Error: no route to the Internet\n";
    }
} 

# remove package
if($parms{button_rm_pkg} and $parms{rm_pkg} ne "default" and not $permpkg{$parms{rm_pkg}})
{
    @pkg_output = `opkg remove $parms{rm_pkg} 2>&1`;
}

# generate data structures

@pkgs = ();
%pkgver = ();
foreach(`opkg list_installed | cut -f1,3 -d' '`)
{
    ($pkg, $ver) = split /\s/, $_;
    next unless $ver;
    push @pkgs, $pkg;
    $pkgver{$pkg} = $ver;
}

@dl_pkgs = ();
%dlpkgver = ();
foreach(`zcat /etc/opkg.list.gz 2>/dev/null`)
{
    ($pkg, $ver) = split /\s/, $_;
    next unless $ver;
    next if $pkgver{$pkg} and $pkgver{$pkg} eq $ver;
    push @dl_pkgs, $pkg;
    $dlpkgver{$pkg} = $ver;
}

#
# handle ssh key actions
#

@key_output = ();
$keyfile = "/etc/dropbear/authorized_keys";

# upload key
if($parms{button_ul_key} and -f "/tmp/web/upload/file")
{
    $count = `wc -l $keyfile 2>/dev/null`;
    system "grep ^ssh- /tmp/web/upload/file >> $keyfile";
    if($count eq `wc -l $keyfile`)
    {
	push @key_output, "Error: file does not appear to be an ssh key file\n";
	push @key_output, "Authorized keys not changed.\n";
    }
    else
    {
	push @key_output, "Key installed.\n";
    }
} 

# remove key
if($parms{button_rm_key} and $parms{rm_key} ne "default" and -f $keyfile)
{
    $count = `wc -l $keyfile`;
    system "grep -v '$parms{rm_key}' $keyfile > $tmpdir/keys";
    system "mv -f $tmpdir/keys $keyfile";
    if($count eq `wc -l $keyfile`)
    {
	push @key_output, "Error: authorized keys were not changed.\n";
    }
    else
    {
	push @key_output, "Key $parms{rm_key} removed.\n";
    }
}

# generate data structures
@keys = ();
open(FILE, ">$tmpdir/newkeys");
foreach(`cat $keyfile 2>/dev/null`)
{
    ($type, $key, $who, $extra) = split /\s+/, $_;
    next if $extra;
    next unless $who =~ /.\@./;
    next unless $type =~ /^ssh-/;
    push @keys, $who;
    print FILE "$type $key $who\n";
}
close(FILE);

# sanitize the key file
if(-f $keyfile and system "diff $keyfile $tmpdir/newkeys >/dev/null 2>&1")
{
    system "mv -f $tmpdir/newkeys $keyfile";
    push @key_output, "Info: key file sanitized.\n";
}


# clean up
system "rm -rf /tmp/web/upload $tmpdir" unless $debug;


#
# generate the page
#

http_header();
html_header("$node administration", 1);
print "<body><center>\n";
alert_banner();
print "<form method=post action=admin enctype='multipart/form-data'>\n";
print "<table width=790>\n";
print "<tr><td>\n";
navbar("admin");
print "</td></tr>\n";

print "<tr><td align=center><a href='/help.html#admin' target='_blank'>Help</a></td></tr>\n";
print "<tr><td align=center>\n";
print "<table cellspacing=10>\n";

#
# firmware
#

print "<tr><td align=center>\n";
print "<table cellspacing=10>\n";
print "<tr><th colspan=3>Firmware Update</th></tr>\n";

if(@fw_output)
{
    print "<tr><td colspan=3 align=center><table><tr><td><b><pre>\n";
    print word_wrap(80, @fw_output);
    print "</pre></b></td></tr></table></td></tr>\n";
}

print "<tr><td align=center colspan=3>current version: $fw_version</td></tr>\n";

print "<tr>\n";
print "<td>Upload Firmware</td>\n";
print "<td><input type=file name=firmfile title='choose the firmware file to install from your hard drive'></td>\n";
print "<td align=center><input type=submit name=button_ul_fw value=Upload title='install the firmware'></td>\n";
print "</tr>\n";

print "<tr>\n";
print "<td>Download Firmware</td>\n";
print "<td><select name=dl_fw style='font-family:monospace'>\n";
selopt_pre("- Select Firmware -", "default", "default");
foreach(@fw_images)
{
    selopt_pre($_, $_, "default");
}
print "</select>\n";
print "<input type=submit name=button_refresh_fw value=Refresh title='download the list of available firmware versions'>\n";
print "<td align=center><input type=submit name=button_dl_fw value=Download title='install the firmware'></td>\n";
print "<td align=right><input type=checkbox name=checkbox_keep_settings>Keep Settings</td>\n";
print "</tr>\n";

print "</table></td></tr>\n";
print "<tr><td colspan=3><hr></td></tr>\n";

#
# packages
#

print "<tr><td align=center>\n";
print "<table cellspacing=10>\n";
print "<tr><th colspan=3>Package Management</th></tr>\n";

if(@pkg_output)
{
    # opkg can produce duplicate first lines, remove them here
    while(defined $pkg_output[1] and $pkg_output[0] eq $pkg_output[1])
    {
	shift @pkg_output;
    }

    print "<tr><td colspan=3 align=center><table><tr><td><b><pre>\n";
    print word_wrap(80, @pkg_output);
    print "</pre></b></td></tr></table></td></tr>\n";
}

print "<tr>\n";
print "<td>Upload Package</td>\n";
print "<td><input type=file name=ul_pkg title='choose the .ipk file to install from your hard drive'> </td>\n";
print "<td align=center><input type=submit name=button_ul_pkg value=Upload title='install the package'></td>\n";
print "</tr>\n";

print "<tr>\n";
print "<td>Download Package</td>\n";
print "<td><select name=dl_pkg style='font-family:monospace'>\n";
selopt_pre("- Select Package -", "default", "default");
foreach $pkg (@dl_pkgs)
{
    selopt_pre("$pkg $dlpkgver{$pkg}", $pkg, "default");
}
print "</select>\n";
print "<input type=submit name=button_refresh_pkg value=Refresh title='download the list of available packages (warning: this takes a lot of space)'>\n";
print "<td align=center><input type=submit name=button_dl_pkg value=Download title='install the package'></td>\n";
print "</tr>\n";

print "<tr>\n";
print "<td>Remove Package</td>\n";
print "<td><select name=rm_pkg style='font-family:monospace'>\n";
selopt_pre("- Select Package -", "default", "default");
foreach $pkg (@pkgs)
{
    $opt = $permpkg{$pkg} ? "disabled" : "";
    selopt_pre("$pkg $pkgver{$pkg}", $pkg, "default", $opt);
}
print "</select></td>\n";
print "<td align=center><input type=submit name=button_rm_pkg value=Remove title='remove the selected package'></td>\n";
print "</tr>\n";

print "</table></td></tr>\n";

print "<tr><td colspan=3><hr></td></tr>\n";

#
# ssh keys
#

print "<tr><td align=center>\n";
print "<table cellspacing=10>\n";
print "<tr><th colspan=3>Authorized SSH Keys</th></tr>\n";

if(@key_output)
{
    print "<tr><td colspan=3 align=center><table><tr><td><b><pre>\n";
    print word_wrap(80, @key_output);
    print "</pre></b></td></tr></table></td></tr>\n";
}

print "<tr>\n";
print "<td>Upload Key</td>\n";
print "<td><input type=file name=sshkey title='choose the id_rsa.pub file to install from your hard drive'></td>\n";
print "<td align=center><input type=submit name=button_ul_key value=Upload title='install the key'></td>\n";
print "</tr>\n";

print "<tr>\n";
print "<td>Remove Key</td>\n";
print "<td><select name=rm_key style='font-family:monospace'>\n";
selopt_pre("- Select Key -", "default", "default");
foreach(@keys)
{
    selopt_pre($_, $_, "default");
}
print "</select>\n";
print "<td align=center><input type=submit name=button_rm_key value=Remove title='remove the selected key'></td>\n";
print "</tr>\n";

print "</table></td></tr>\n";

print "<tr><td colspan=3><hr></td></tr>\n";
print "</table>\n";

print "</td></tr>\n";
print "</table>\n";

print "<input type=hidden name=dev value=1>\n" if $parms{dev};
print "</form>\n";
print "</center>\n";

show_debug_info();
show_parse_errors();

page_footer();
print "</body>\n";
print "</html>\n";