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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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# SPDX-FileCopyrightText: 2022 Nicolas Hennion <[email protected]> |
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# |
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# SPDX-License-Identifier: LGPL-3.0-only |
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# |
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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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import re |
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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 separated 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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# 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 character, but do no split spaces within quotes (remove surrounding quotes, though) |
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tmp_split = [_ for _ in list(filter(None, re.split(r'(\s+)|(".*?"+?)|(\'.*?\'+?)', sub_cmd))) if _ != ' '] |
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sub_cmd_split = [_[1:-1] if (_[0]==_[-1]=='"') or (_[0]==_[-1]=='\'') else _ for _ in tmp_split] |
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p = Popen(sub_cmd_split, shell=False, stdin=sub_cmd_stdin, stdout=PIPE, 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
