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#!/usr/bin/perl
# Show a terminal that is connected to a Websockets server via Webmin proxying
require './xterm-lib.pl';
&ReadParse();
$ENV{'HTTP_WEBMIN_PATH'} && &error($text{'index_eproxy'});
# Check for needed modules
my @modnames = ("Digest::SHA", "Digest::MD5", "IO::Pty",
"IO::Select", "Time::HiRes",
"Net::WebSocket::Server");
foreach my $modname (@modnames) {
eval "use ${modname};";
if ($@) {
&ui_print_header(undef, $text{'index_title'}, "", undef, 1, 1, 0);
my $missinglink = &text('index_cpan', "<tt>$modname</tt>",
"../cpan/download.cgi?source=3&cpan=$modname&mode=2&return=/$module_name/&returndesc=".&urlize($module_info{'desc'}));
if ($gconfig{'os_type'} eq 'redhat-linux') {
$missinglink .= " ".
&text('index_epel',
'https://docs.fedoraproject.org/en-US/epel');
}
elsif ($gconfig{'os_type'} eq 'suse-linux') {
$missinglink =
&text('index_suse', "<tt>$modname</tt>",
'https://software.opensuse.org/download/package?package=perl-IO-Tty&project=devel%3Alanguages%3Aperl');
}
if (&get_product_name() eq 'usermin') {
print &text('index_missing', $modname) ."<p>\n";
}
else {
print $missinglink ."<p>\n";
}
&ui_print_footer("/", $text{'index'});
exit;
}
}
# Get Webmin current version for links serial
my $wver = &get_webmin_version();
$wver =~ s/\.//;
# Build Xterm dependency links
my $termlinks =
{ 'css' => ["xterm.css?$wver"],
'js' => ["xterm.js?$wver",
"xterm-addon-attach.js?$wver",
"xterm-addon-fit.js?$wver",
"xterm-addon-canvas.js?$wver",
"xterm-addon-webgl.js?$wver"] };
# Pre-process options
my $conf_size_str = $config{'size'};
my $def_cols_n = 80;
my $def_rows_n = 24;
my $xmlhr = $ENV{'HTTP_X_REQUESTED_WITH'} eq "XMLHttpRequest";
my %term_opts;
# Parse module config
my ($conf_cols_n, $conf_rows_n) = ($conf_size_str =~ /([\d]+)X([\d]+)/i);
$conf_cols_n = int($conf_cols_n);
$conf_rows_n = int($conf_rows_n);
# Set columns and rows vars
my $env_cols = $conf_cols_n || $def_cols_n;
my $env_rows = $conf_rows_n || $def_rows_n;
# Set columns and rows environment vars only
# in fixed mode, and only for old themes
if ($conf_cols_n && $conf_rows_n && !$xmlhr) {
$ENV{'COLUMNS'} = $conf_cols_n;
$ENV{'LINES'} = $conf_rows_n;
}
# Define columns and rows
my $conf_screen_reader = $config{'screen_reader'} eq 'true' ? 'true' : 'false';
$termjs_opts{'Options'} = "{ cols: $env_cols, rows: $env_rows, screenReaderMode: $conf_screen_reader }";
my $term_size = "
min-width: ".($conf_cols_n ? "".($conf_cols_n * 9)."px" : "calc(100vw - 22px)").";
max-width: ".($conf_cols_n ? "".($conf_cols_n * 9)."px" : "calc(100vw - 22px)").";
min-height: ".($conf_rows_n ? "".($conf_rows_n * 18)."px" : "calc(100vh - 55px)").";
max-height: ".($conf_rows_n ? "".($conf_rows_n * 18)."px" : "calc(100vh - 55px)").";";
# Tweak old themes inline
my $styles_inline = <<EOF;
body[style='height:100%'] {
height: 97% !important;
}
#headln2l a {
white-space: nowrap;
}
#terminal {
border: 1px solid #000;
background-color: #000;
padding: 2px;
margin: 0 auto;
$term_size
}
#terminal:empty:before {
display: block;
content: " ";
overflow: hidden;
width: 12px;
height: 12px;
margin-top: 4px;
margin-left: 4px;
border-radius: 50%;
box-sizing: border-box;
border: 1px solid transparent;
border-top-color: rgba(255, 255, 255, 0.8);
border-bottom-color: rgba(255, 255, 255, 0.8);
animation: jumping-spinner 1s ease infinite;
}
#terminal:empty:after {
display: block;
content: attr(data-label);
margin-left: 24px;
margin-top: -16px;
font-weight: 100;
color: rgba(255, 255, 255, 0.8);
font-family: "Lucida Console", Courier, monospace;
font-size: 14px;
text-transform: uppercase;
}
\@keyframes jumping-spinner {
to {
transform: rotate(360deg);
}
}
#terminal + script ~ * {
display: none
}
#terminal > .terminal {
visibility: hidden;
animation: .15s fadeIn;
animation-fill-mode: forwards;
}
\@keyframes fadeIn {
99% {
visibility: hidden;
}
100% {
visibility: visible;
}
}
EOF
# Print header
&ui_print_header(undef, $text{'index_title'}, "", undef, 1, 1, 0, undef,
"<link rel=stylesheet href=\"$termlinks->{'css'}[0]\">\n".
"<script src=\"$termlinks->{'js'}[0]\"></script>\n".
"<script src=\"$termlinks->{'js'}[1]\"></script>\n".
"<script src=\"$termlinks->{'js'}[2]\"></script>\n".
"<style>$styles_inline</style>\n"
);
# Print main container
print "<div data-label=\"$text{'index_connecting'}\" id=\"terminal\"></div>\n";
# Get a free port that can be used for the socket
my $port = &allocate_miniserv_websocket($module_name);
# Check permissions for user to run as
my $user = $access{'user'};
if ($user eq "*") {
$user = $remote_user;
}
elsif ($user eq "root" && $remote_user ne $user && !$in{'user'} &&
$access{'sudoenforce'} ne '0') {
# If possible, start with a sudo-capable user
my @uinfo = getpwnam($remote_user);
if (@uinfo && $uinfo[7]) {
$user = $remote_user;
}
}
$user = $config{'user'} if ($user eq 'root' && $config{'user'});
# Switch to given user
if ($user eq "root" && $in{'user'}) {
defined(getpwnam($in{'user'})) ||
&error(&text('index_euser', &html_escape($in{'user'})));
$user = $in{'user'};
}
my @uinfo = getpwnam($user);
@uinfo || &error(&text('index_euser', &html_escape($user)));
# Check for directory to start the shell in
my $dir = $in{'dir'};
# Launch the shell server on the allocated port
my $shellserver_cmd = "$module_config_directory/shellserver.pl";
if (!-r $shellserver_cmd) {
&create_wrapper($shellserver_cmd, $module_name, "shellserver.pl");
}
$ENV{'SESSION_ID'} = $main::session_id;
&system_logged($shellserver_cmd." ".quotemeta($port)." ".quotemeta($user).
($dir ? " ".quotemeta($dir) : "").
" >$module_var_directory/websocket-connection-$port.out 2>&1 </dev/null");
# Open the terminal
my $url = &get_miniserv_websocket_url($port, $config{'host'}, $module_name);
my $canvasAddon = $termlinks->{'js'}[3];
my $webGLAddon = $termlinks->{'js'}[4];
my $term_script = <<EOF;
(function() {
const socket = new WebSocket('$url', 'binary'),
termcont = document.getElementById('terminal'),
err_conn_cannot = 'Cannot connect to the socket $url',
err_conn_lost = 'Connection to the socket $url lost',
webGLAddonLink = '$webGLAddon',
canvasAddonLink = '$canvasAddon',
detectWebGLContext = (function() {
const canvas = document.createElement("canvas"),
gl = canvas.getContext("webgl") ||
canvas.getContext("experimental-webgl");
return gl instanceof WebGLRenderingContext ? true : false;
})();
socket.onopen = function() {
const term = new Terminal($termjs_opts{'Options'}),
attachAddon = new AttachAddon.AttachAddon(this),
fitAddon = new FitAddon.FitAddon(),
renderScript = document.createElement('script');
renderScript.src = detectWebGLContext ? webGLAddonLink : canvasAddonLink;
renderScript.async = false;
document.body.appendChild(renderScript);
// Wait to load requested render addon
renderScript.addEventListener('load', function() {
const rendererAddon = detectWebGLContext ?
new WebglAddon.WebglAddon() :
new CanvasAddon.CanvasAddon();
term.loadAddon(attachAddon);
term.loadAddon(fitAddon);
term.loadAddon(rendererAddon);
term.open(termcont);
setTimeout(function() {term.focus()}, 6e2);
// Handle case of dropping WebGL context
if (typeof WebglAddon === 'object') {
rendererAddon.onContextLoss(function() {
rendererAddon.dispose();
});
}
// On resize event triggered by fit()
term.onResize(function(e) {
socket.send('\\\\033[8;(' + e.rows + ');(' + e.cols + ')t');
});
// Observe on terminal container change
new ResizeObserver(function() {
fitAddon.fit();
}).observe(termcont);
});
};
socket.onerror = function() {
termcont.innerHTML = '<tt style="color: \#ff0000">Error: ' +
err_conn_cannot + '</tt>';
};
socket.onclose = function() {
termcont.innerHTML = '<tt style="color: \#ff0000">Error: ' +
err_conn_lost + '</tt>';
};
})();
EOF
# Return inline script data depending on type
print "<script>\n";
if ($xmlhr) {
print "var xterm_argv = ".
&convert_to_json(
{ 'conf' => \%config,
'files' => $termlinks,
'socket_url' => $url,
'port' => $port,
'cols' => $env_cols,
'rows' => $env_rows,
'uinfo' => \@uinfo });
}
else {
print $term_script;
}
print "</script>\n";
&ui_print_footer();
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