mirror of
https://github.com/nicolargo/glances.git
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79 lines
2.2 KiB
Python
79 lines
2.2 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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# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
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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 subprocess import Popen, PIPE
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import re
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from glances.globals import nativestr
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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.kill()
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p_last.wait()
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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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