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123 lines
4.1 KiB
Lua
123 lines
4.1 KiB
Lua
--
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-- (C) 2013-26 - ntop.org
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--
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require "ntop_utils"
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local sys_utils = require "sys_utils"
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local dhcp_enabled_key = "ntopng.nedge.dhcp.kea.enabled"
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local dhcp_server_utils = {}
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-- ###############################################################
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-- Cached module (check once)
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local cached_module = nil
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-- ###############################################################
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-- @brief Check if a systemd service exists
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-- @param service_name The name of the systemd service
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-- @return true if the service exists, false otherwise
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local function serviceExists(service_name)
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local cmd = "systemctl list-unit-files " .. service_name .. ".service 2>/dev/null | grep -q " .. service_name
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local result = sys_utils.execShellCmd(cmd .. " && echo 'exists'")
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return not isEmptyString(result)
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end
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-- ###############################################################
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-- Detect which DHCP server is available on the system and return
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-- the appropriate DHCP server module (kea_dhcp_server or isc_dhcp_server)
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function dhcp_server_utils.getDhcpServerHandler()
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if cached_module then
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return cached_module
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end
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local kea_service = "kea-dhcp4-server"
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local kea_service_alias = "isc-kea-dhcp4-server"
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local isc_service = "isc-dhcp-server"
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-- Check if kea-dhcp4-server systemd service exists
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local kea_exists = serviceExists(kea_service)
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if not kea_exists then
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-- Try with the service alias (this depends on version)
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kea_service = kea_service_alias
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kea_exists = serviceExists(kea_service)
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end
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if kea_exists then
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traceError(TRACE_INFO, TRACE_CONSOLE, "Using Kea DHCP server")
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cached_module = require "conf_handlers.kea_dhcp_server"
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cached_module.service_name = kea_service
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else
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traceError(TRACE_INFO, TRACE_CONSOLE, "Using ISC DHCP server")
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cached_module = require "conf_handlers.isc_dhcp_server"
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cached_module.service_name = isc_service
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end
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return cached_module
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end
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-- ###############################################################
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function dhcp_server_utils.getDhcpServerName()
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local dhcp_handler = dhcp_server_utils.getDhcpServerHandler()
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return dhcp_handler.service_name
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end
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-- ###############################################################
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-- This function is used to check if the DHCP server status is up
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-- and if not, restart it.
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function dhcp_server_utils.checkRestartDHCPService()
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if ntop.isnEdge() then
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local dhcp_handler = dhcp_server_utils.getDhcpServerHandler()
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if (ntop.getCache(dhcp_enabled_key) or '0') == '1' then
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if not sys_utils.isActiveService(dhcp_handler.service_name) then
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sys_utils.restartService(dhcp_handler.service_name)
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end
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end
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end
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end
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-- ###############################################################
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-- This function is used to start the DHCP server
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function dhcp_server_utils.startDHCPService()
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if ntop.isnEdge() then
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local dhcp_handler = dhcp_server_utils.getDhcpServerHandler()
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ntop.setCache(dhcp_enabled_key, '1')
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sys_utils.enableService(dhcp_handler.service_name)
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sys_utils.restartService(dhcp_handler.service_name)
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end
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end
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-- ###############################################################
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-- This function is used to stop the DHCP server
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function dhcp_server_utils.stopDHCPService()
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if ntop.isnEdge() then
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local dhcp_handler = dhcp_server_utils.getDhcpServerHandler()
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ntop.setCache(dhcp_enabled_key, '0')
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sys_utils.disableService(dhcp_handler.service_name)
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sys_utils.stopService(dhcp_handler.service_name)
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end
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end
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-- ###############################################################
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-- @brief Write DHCP server configuration
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-- @param dhcp_config The DHCP server configuration table
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-- @param all_interfaces Table mapping interface names to roles (lan/wan)
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-- @param dns_config The DNS configuration table with global and secondary DNS
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-- @return true on success, false on error
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function dhcp_server_utils.writeDhcpServerConfiguration(dhcp_config, all_interfaces, dns_config)
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local dhcp_handler = dhcp_server_utils.getDhcpServerHandler()
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return dhcp_handler.writeDhcpServerConfiguration(dhcp_config, all_interfaces, dns_config)
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end
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-- ###############################################################
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return dhcp_server_utils
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