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# -*- 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 <[email protected]> |
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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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nicolargo /
glances
