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--
-- (C) 2013-22 - ntop.org
--
local sys_utils = {}
-- If false, some commands and config files are not executed/created really
-- This will be overwritten with the config value
local REAL_EXEC = ntop.getPref("ntopng.prefs.nedge_real_exec") == "1"
-- ################################################################
local FileMock = {}
FileMock.__index = FileMock
function FileMock.open(fname, mode)
local obj = {}
setmetatable(obj, FileMock)
traceError(TRACE_NORMAL, TRACE_CONSOLE, "[File::" .. fname .. "]")
return obj
end
function FileMock:write(data)
local lines = split(data, "\n")
for _, line in pairs(lines) do
if not isEmptyString(line) then
traceError(TRACE_NORMAL, TRACE_CONSOLE, "\t"..line)
end
end
return true
end
function FileMock:close()
traceError(TRACE_NORMAL, TRACE_CONSOLE, "[File::END]")
return true
end
-- ################################################################
function sys_utils.setRealExec(new_v)
REAL_EXEC = new_v
local v = ternary(REAL_EXEC, "1", "0")
if ntop.getPref("ntopng.prefs.nedge_real_exec") ~= v then
ntop.setPref("ntopng.prefs.nedge_real_exec", v)
end
end
-- ################################################################
function sys_utils.openFile(fname, mode)
local cls
if REAL_EXEC then
cls = io
else
cls = FileMock
end
return cls.open(fname, mode)
end
-- ################################################################
-- Execute a system command
function sys_utils.execCmd(cmd)
if(REAL_EXEC) then
-- traceError(TRACE_NORMAL, TRACE_CONSOLE, "[execCmd] ".. cmd)
return(os.execute(cmd))
else
traceError(TRACE_NORMAL, TRACE_CONSOLE, "[execCmd] ".. cmd)
return 0
end
end
-- ################################################################
-- execCmd with command output
-- If input is specified, it is provided as stdin to the command
-- otherwise the command is executed with no input and the output returned
-- NOTE: no check for REAL_EXEC, the command will always be executed!
function sys_utils.execShellCmd(cmd, input)
local f, s
if input then
f = io.popen(cmd, 'w')
if f then
f:write(input)
s = true
else
s = false
end
else
f = assert(io.popen(cmd, 'r'))
s = assert(f:read('*a'))
end
if f then
f:close()
end
return s
end
-- ################################################################
local function _isServiceStatus(service_name, status)
local check_cmd = "systemctl is-"..status.." " .. service_name
local is_active = sys_utils.execShellCmd(check_cmd)
return ternary(string.match(is_active, "^"..status), true, false)
end
function sys_utils.isActiveService(service_name)
return _isServiceStatus(service_name, "active")
end
function sys_utils.isFailedService(service_name)
return _isServiceStatus(service_name, "failed")
end
function sys_utils.isActiveFailedService(service_name)
local check_cmd = "systemctl is-active " .. service_name
local is_active = sys_utils.execShellCmd(check_cmd)
return ternary(string.match(is_active, "inactive"), false, true)
end
-- ################################################################
function sys_utils.enableService(service_name)
return sys_utils.execCmd("systemctl enable " .. service_name)
end
function sys_utils.disableService(service_name)
return sys_utils.execCmd("systemctl disable " .. service_name)
end
function sys_utils.restartService(service_name)
return sys_utils.execCmd("systemctl restart " .. service_name)
end
function sys_utils.stopService(service_name)
return sys_utils.execCmd("systemctl stop " .. service_name)
end
-- ################################################################
function sys_utils.rebootSystem()
local do_reboot = ternary(REAL_EXEC, "reboot", nil)
ntop.shutdown(do_reboot)
end
function sys_utils.shutdownSystem()
local do_shutdown = ternary(REAL_EXEC, "poweroff", nil)
ntop.shutdown(do_shutdown)
end
function sys_utils.restartSelf()
local do_restart_self = ternary(REAL_EXEC, "restart_self", nil)
ntop.shutdown(do_restart_self)
end
-- ################################################################
function sys_utils.loadConntrack()
local info = ntop.getInfo(false)
local os = info.OS
if not string.find(os, "Ubuntu 20%.") then
sys_utils.execCmd("modprobe nf_conntrack_ipv4")
end
end
-- ################################################################
return sys_utils
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