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#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
"""Secures functions for Glances"""
import re
from subprocess import PIPE, Popen
from glances.globals import nativestr
def secure_popen(cmd):
"""A more or less secure way to execute system commands
Multiple command should be separated with a &&
:return: the result of the commands
"""
ret = ''
# Split by multiple commands (only '&&' separator is supported)
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 (|)
"""
# Split by redirection '>'
cmd_split_redirect = cmd.split('>')
if len(cmd_split_redirect) > 2:
return f'Glances error: Only one file redirection allowed ({cmd})'
if 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 character, but do no split spaces within quotes (remove surrounding quotes, though)
tmp_split = [_ for _ in list(filter(None, re.split(r'(\s+)|(".*?"+?)|(\'.*?\'+?)', sub_cmd))) if _ != ' ']
sub_cmd_split = [_[1:-1] if (_[0] == _[-1] == '"') or (_[0] == _[-1] == '\'') else _ for _ in tmp_split]
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.kill()
p_last.wait()
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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