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88 lines
2.6 KiB
Python
88 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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#
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# This file is part of Glances.
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#
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# Copyright (C) 2021 Nicolargo <nicolas@nicolargo.com>
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#
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# Glances is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Glances is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""Secures functions for Glances"""
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from glances.compat import nativestr
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from subprocess import Popen, PIPE
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def secure_popen(cmd):
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"""A more or less secure way to execute system commands
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Multiple command should be seprated with a &&
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Return: the result of the commands
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"""
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ret = ''
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# Split by multiple commands '&&'
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for c in cmd.split('&&'):
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ret += __secure_popen(c)
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return ret
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def __secure_popen(cmd):
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"""A more or less secure way to execute system command
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Manage redirection (>) and pipes (|)
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"""
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ret = ''
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# Split by redirection '>'
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cmd_split_redirect = cmd.split('>')
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if len(cmd_split_redirect) > 2:
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return 'Glances error: Only one file redirection allowed ({})'.format(cmd)
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elif len(cmd_split_redirect) == 2:
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stdout_redirect = cmd_split_redirect[1].strip()
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cmd = cmd_split_redirect[0]
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else:
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stdout_redirect = None
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sub_cmd_stdin = None
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p_last = None
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# Split by pipe '|'
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for sub_cmd in cmd.split('|'):
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# Split by space ' '
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sub_cmd_split = [i for i in sub_cmd.split(' ') if i]
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p = Popen(sub_cmd_split,
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shell=False,
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stdin=sub_cmd_stdin,
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stdout=PIPE,
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stderr=PIPE)
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if p_last is not None:
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# Allow p_last to receive a SIGPIPE if p exits.
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p_last.stdout.close()
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p_last = p
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sub_cmd_stdin = p.stdout
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p_ret = p_last.communicate()
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if nativestr(p_ret[1]) == '':
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# No error
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ret = nativestr(p_ret[0])
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if stdout_redirect is not None:
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# Write result to redirection file
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with open(stdout_redirect, "w") as stdout_redirect_file:
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stdout_redirect_file.write(ret)
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else:
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# Error
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ret = nativestr(p_ret[1])
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return ret
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