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