Posts Tagged linux
How to have access to a shell without ssh or telnet using jQuery terminal
Posted by jcubic in Programming on June 9, 2012
If you have, like I did, a virtual server on hosting service, that support cgi but give have access to a shell and php have passthru disabled you still can have access to a shell, even if you can’t install anything on that machine – like anyterm.
There is this project, which I did, called jQuery terminal, that emulate a Unix terminal. All you need is interpreter that will execute shell commands.
Lots of hosting services disable php passthru but leave cgi script, so if you have them you can create simple shell like this one:
#!/bin/bash
echo -en "Content-Type: text/plain\r\n\r\n"
query=$(/usr/bin/python -c "import urllib; print urllib.unquote_plus('$QUERY_STRING')")
eval $query 2>&1
I use python subprocess to decode QUERY_STRING. Probably it can be done using some Unix tools.
On my server I use Python CGI script like this one:.
#!/usr/bin/python
import cgi
import subprocess as sub
try:
from json import dumps as json_serialize
except ImportError:
def json_serialize(obj):
result = ''
t = type(obj)
if t == types.StringType:
result += '"%s"' % obj.replace('\\', '\\\\').replace('"', '\\"').replace('\n', '\\n')
elif t == types.NoneType:
result += 'null'
elif t == types.IntType or t == types.FloatType:
result += str(obj)
elif t == types.LongType:
result += str(int(obj))
elif t == types.TupleType:
result += '[' + ','.join(map(json_serialize, list(obj))) + ']'
elif t == types.ListType:
result += '[' + ','.join(map(json_serialize, obj)) + ']'
elif t == types.DictType:
array = ['"%s":%s' % (k,json_serialize(v)) for k,v in obj.iteritems()]
result += '{' + ','.join(array) + '}'
else:
result += '"unknown type - ' + type(obj).__name__ + '"'
return result
class Singleton(object):
__single = None
def __init__(self):
Singleton.__single = self
def __new__(cls):
if Singleton.__single:
return Singleton.__single
else:
return super(Singleton, cls).__new__(cls)
class Form(Singleton):
def __init__(self):
super(Form)
self.form = cgi.FieldStorage()
def __getitem__(self, name):
return self.form.getvalue(name)
def execv(command, path):
command = 'cd %s && %s && pwd 1>&2' % (path, command)
proc = sub.Popen(['/bin/bash', '-c', command],
stdout=sub.PIPE, stderr=sub.PIPE)
stderr = proc.stderr.read()[:-1]
stdout = proc.stdout.read()[:-1]
if not os.path.exists(stderr):
raise Exception(stdout, stderr)
return {
"cwd": stderr,
"stdout": re.sub('.\x08', '', stdout)
}
if __name__ == '__main__':
print "Content-Type: text/plain"
print
form = Form()
if token() == form['token']:
response = {}
try:
response['result'] = execv(form['command'], form['path'])
except Exception, e:
response['error'] = e.args[1]
response['result'] = {'stdout': e.args[0], 'cwd': form['path']}
else:
response['error'] = None
else:
response = {'error': 'You are not authorized', 'result': None}
stdout.write(json_serialize(response))
You have enabled passthru in php you can write your shell in php.
Now when you have access to a shell you need to setup interface using jQuery terminal.
<!DOCTYPE HTML>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>Shell</title>
<script src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
<script src="terminal/js/jquery.mousewheel-min.js"></script>
<script src="terminal/js/jquery.terminal.js"></script>
<link href="terminal/css/jquery.terminal.css" rel="stylesheet"/>
<style>
.terminal a.ui-slider-handle:focus { outline: none; }
body { margin: 0; padding: 0; }
html { background-color: #000; }
.clear { clear: both; }
/* This works only in Safari and Google Chrome */
@media screen and (-webkit-min-device-pixel-ratio:0) {
.terminal, .terminal .terminal-output, .terminal .terminal-output div,
.terminal .terminal-output div div, .cmd, .terminal .cmd span, .terminal .cmd div {
font-weight: bold;
}
}
</style>
<script>
$(function() {
var pwd, last_dir, home_dir;
var terminal = $('#shell').terminal(function(command, term) {
if (command.replace(/^ *(.*) *$/, '$1') == '-') {
pwd = last_dir;
return;
}
term.pause();
$.post("/cgi-bin/cmd.py", {
token: term.token(),
command: command.replace(/(\\)?~/, function($0,$1) {
return $1 ? $0 : home_dir;
}),
path: pwd
}, function(response) {
term.echo(response.result.stdout);
pwd = response.result.cwd;
term.resume();
});
}, {
login: function(user, password, authenticate) {
$.post("/cgi-bin/cmd.py", {
user: user,
password: password
}, function(token) {
if (token) {
home_dir = pwd = last_dir = '/home/ + user;
}
authenticate(token);
});
},
prompt: function(callback) {
var username = terminal.login_name();
var re = new RegExp("^" + '/home/' + username);
var username = '[[;#44D544;]' + username + ']';
var path = '[[;#5555FF;]' + pwd.replace(re, '~') + ']';
callback(username + '[[;#989898;]:]' + path + '[[;#989898;]$] ');
},
name: 'shell'
}).css({
overflow: 'auto'
});
$(window).resize(function() {
terminal.css('height', $(window).height()-20);
}).resize();
});
</script>
</head>
<body>
<div id="shell"></div>
</body>
</html>
Concatenate files with progress bar on GNU/Linux
Posted by jcubic in Programming on February 2, 2011
When I download files form rapidshare or other file hosting sites I occasionally download movies that are splited into parts, and to watch the movie they need to be concatenated.
I came up with this bash function which I put in my .bashrc file:
function concat() {
files=${@:1:$(($#-1))}
cat $files | pv -s $(du -cb $files | tail -n1 | cut -d $'\t' -f1) > ${@: -1}
}
If you have files like Movie.avi.001…Movie.avi.020, to concatenate these files just type:
concat Movie.avi.* Movie.avi
And you’ll see progress bar when output file is created.
[Ruby] Wyświetlanie definicji ze “Słownika Wyrazów Obcych Kopalinskiego”
Posted by jcubic in Programming on January 7, 2011
To jest kod skryptu w Ruby do wyświetlania definicji ze “Słownika Wyrazów Obcych Kopalińskiego”. Pobierz plik kopalinski.rb.
Żeby użyć tego skryptu musisz mieć zainstalowanego Ruby-ego.
W terminalu wpisz:
kopalinski.rb Słownik
Skrypt wyświetli definicje słowa “Słownik”. Jeśli w słowniku Kopalińskiego nie ma jakiegoś słowa skrypt nie wyświetla nic.
