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-- acf model for /etc/dhcp/*
-- Copyright(c) 2007 A. Brodmann - Licensed under terms of GPL2
module (..., package.seeall)
require("lfs")
require("validator")
local subnet = { }
local cfgdir = "/etc/dhcp/"
dep_check = function ()
icode = 0
retval = {}
lpos = require "posix"
ptr, msg, code = lpos.access("/etc/dhcp")
if ptr == nil then
table.insert(retval, "/etc/dhcp")
icode = icode + 1
end
ptr, msg, code = lpos.access("/usr/sbin/dhcpd")
if ptr == nil then
table.insert(retval, "/usr/sbin/dhcpd")
icode = icode + 1
end
ptr, msg, code = lpos.access("/etc/init.d/dhcpd")
if ptr == nil then
table.insert(retval, "/etc/init.d/dhcpd")
icode = icode + 1
end
if icode == 0 then
retval = nil
end
return retval
end
subnet_read = function( name )
local filename = cfgdir .. name .. ".subnet"
local net = { name = cfe({ type="message", value=name, label="Name" }),
defleasetime = cfe({ label="Default Lease Time" }),
maxleasetime = cfe({ label="Maximum Lease Time" }),
gateway = cfe({ label="Gateway"}),
domainname = cfe({ label="Domainname" }),
dnssrv1 = cfe({ label="DNS Server 1" }),
dnssrv2 = cfe({ label="DNS Server 2" }),
subnet = cfe({ label="Subnet" }),
netmask = cfe({ label="Netmask" }),
leaserangestart = cfe({ label="Lease Range Start" }),
leaserangeend = cfe({ label="Lease Range End" }),
wpad = cfe({ label="Web Proxy Auto Discovery", type="select", option = { "yes", "no" } })
}
for line in io.lines(filename) do
if (string.sub(line, 1, 15) == "def-lease-time:") then
net.defleasetime.value = string.sub(line, 17)
elseif (string.sub(line, 1, 15) == "max-lease-time:") then
net.maxleasetime.value = string.sub(line, 17)
elseif (string.sub(line, 1, 8) == "gateway:") then
net.gateway.value = string.sub(line, 10)
elseif (string.sub(line, 1, 12) == "domain-name:") then
net.domainname.value = string.sub(line, 14)
elseif (string.sub(line, 1, 10) == "dns-srv-1:") then
net.dnssrv1.value = string.sub(line, 12)
elseif (string.sub(line, 1, 10) == "dns-srv-2:") then
net.dnssrv2.value = string.sub(line, 12)
elseif (string.sub(line, 1, 7) == "subnet:") then
net.subnet.value = string.sub(line, 9)
elseif (string.sub(line, 1, 8) == "netmask:") then
net.netmask.value = string.sub(line, 10)
elseif (string.sub(line, 1, 18) == "lease-range-start:") then
net.leaserangestart.value = string.sub(line, 20)
elseif (string.sub(line, 1, 16) == "lease-range-end:") then
net.leaserangeend.value = string.sub(line, 18)
elseif (string.sub(line, 1, 5) == "wpad:") then
net.wpad.value = string.sub(line, 7)
end
end
return net
end
subnet_write = function( net )
msg, fields = validate_network( net )
if #msg > 0 then
return cfe({ msg = msg, fields = fields }), net
end
local filename = cfgdir .. net.name.value .. ".subnet"
local file = io.open( filename, "w+" )
file:write( "def-lease-time: " .. net.defleasetime.value .. "\n" )
file:write( "max-lease-time: " .. net.maxleasetime.value .. "\n" )
file:write( "gateway: " .. net.gateway.value .. "\n" )
file:write( "domain-name: " .. net.domainname.value .. "\n" )
file:write( "dns-srv-1: " .. net.dnssrv1.value .. "\n" )
file:write( "dns-srv-2: " .. net.dnssrv2.value .. "\n" )
file:write( "subnet: " .. net.subnet.value .. "\n" )
file:write( "netmask: " .. net.netmask.value .. "\n" )
file:write( "lease-range-start: " .. net.leaserangestart.value .. "\n" )
file:write( "lease-range-end: " .. net.leaserangeend.value .. "\n" )
file:write( "wpad: " .. net.wpad.value .. "\n" )
file:close()
return cfe({ msg = "", fields = {}}), net
end
subnet_create = function( net )
if file_exists( net.name.value ) then
return cfe({ msg = "This subnet already exists!", fields = {}}), net
end
retcode, net = subnet_write( net )
return retcode, net
end
_tonumber = function( value )
ret = tonumber( value )
if (ret == nil) then
ret = 0
end
return ret
end
validate_network = function( net )
fields = { "none" }
msg = ""
if #net.name.value < 4 then
table.insert(fields, "name")
msg = msg .. "Minimum network name length is 4 characters!\n"
end
if net.name.value == "<new>" then
table.insert(fields, "name")
msg = msg .. "<new> is not a valid network name!\n"
end
if not validator.is_integer_in_range(_tonumber(net.defleasetime.value), 1800, 86400) then
table.insert(fields, "defleasetime")
msg = msg .. "Default-Lease-Time must be: 1800 < x < 86400\n"
end
if not validator.is_integer_in_range(_tonumber(net.maxleasetime.value), 1800, 86400) then
table.insert(fields, "maxleasetime")
msg = msg .. "Maximum-Lease-Time must be: 1800 < x < 86400\n"
end
if not validator.is_ipv4(net.gateway.value) then
table.insert(fields, "gateway")
msg = msg .. "Gateway: invalid IPv4 address!\n"
end
if not validator.is_ipv4(net.dnssrv1.value) then
table.insert(fields, "dnssrv1")
msg = msg .. "DNS Server 1: invalid IPv4 address!\n"
end
if not validator.is_ipv4(net.dnssrv2.value) then
if #net.dnssrv2.value > 0 then
table.insert(fields, "dnssrv2")
msg = msg .. "DNS Server 2: invalid IPv4 address!\n"
end
end
if not validator.is_ipv4(net.subnet.value) then
table.insert(fields, "subnet")
msg = msg .. "Subnet: invalid IPv4 address!\n"
end
if not validator.is_ipv4(net.netmask.value) then
table.insert(fields, "netmask")
msg = msg .. "Netmask: invalid IPv4 address!\n"
end
if not validator.is_ipv4(net.leaserangestart.value) then
if #net.leaserangestart.value > 0 then
table.insert(fields, "leaserangestart")
msg = msg .. "Lease-Range-Start: invalid IPv4 address!\n"
end
end
if not validator.is_ipv4(net.leaserangeend.value) then
if #net.leaserangeend.value > 0 then
table.insert(fields, "leaserangeend")
msg = msg .. "Lease-Range-End: invalid IPv4 address!\n"
end
end
return msg, fields
end
file_exists = function( filename )
retval = false
fn = cfgdir .. net.name.value .. ".subnet"
file = io.open( fn, "r" )
if file ~= nil then
retval = true
file:close()
end
return retval
end
read_file = function ( filename )
local contents = ""
local line = ""
local file = io.open( filename, "r" )
if file ~= nil then
line = file:read( "*l" )
while line ~= nil do
contents = contents .. "\n" .. line
line = file:read( "*l" )
end
file:close()
else
contents = "\n Error: File not found!\n\n"
end
return contents
end
is_running = function( process )
local retval = false
local file = io.popen("pidof " .. process)
if file ~= nil then
local line = file:read( "*l" )
file:close()
if #line > 0 then
retval = true
end
end
return retval
end
get_dhcpd_version = function()
local retval = "dhcpd"
local file = io.popen("/usr/sbin/dhcpd --version")
if file ~= nil then
local line = file:read( "*a" )
if #line > 0 then
retval = line
end
file:close()
end
return retval
end
service_control = function ( command )
local retval = ""
local line = ""
local file = io.popen( "/etc/init.d/dhcpd " .. command )
if file ~= nil then
line = file:read( "*a" )
while line ~= nil do
retval = retval .. "\n" .. line
line = file:read( "*l" )
end
file:close()
end
return retval
end
function nonil( value )
local retval = ""
if value ~= nil then
retval = value
end
return retval
end
get_subnets = function ()
local retval = retval or {}
for sn in lfs.dir( cfgdir ) do
if string.sub(sn, -7) == ".subnet" then
table.insert(retval, string.sub(sn, 1, -8))
end
end
return retval
end
create_new_net = function( name, defleasetime, maxleasetime, gateway, domainname, dnssrv1, dnssrv2, subnet, netmask, leaserangestart, leaserangeend, wpad )
net = { name = { label="Name", value=nonil(name), type="message" },
defleasetime = { label="Default Lease Time", value=nonil(defleasetime), type="text" },
maxleasetime = { label="Maximum Lease Time", value=nonil(maxleasetime), type="text" },
gateway = { label="Gateway", value=nonil(gateway), type="text" },
domainname = { label="Domainname", value=nonil(domainname), type="text" },
dnssrv1 = { label="DNS Server 1", value=nonil(dnssrv1), type="text" },
dnssrv2 = { label="DNS Server 2", value=nonil(dnssrv2), type="text" },
subnet = { label="Subnet", value=nonil(subnet), type="text" },
netmask = { label="Netmask", value=nonil(netmask), type="text" },
leaserangestart = { label="Lease Range Start", value=nonil(leaserangestart), type="text" },
leaserangeend = { label="Lease Range End", value=nonil(leaserangeend), type="text" },
wpad = { label="Web Proxy Auto Discovery", value=nonil(wpad),
type="select", value=nonil(wpad), option = { "yes", "no"} }
}
if net.wpad.value == "" then
net.wpad.value = "no"
end
return net
end
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