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.. _lua_examples:
Lua examples
============
Important that accel-ppp was built with lua support ``cmake -DLUA=TRUE`` or if system has more modern lua version, need this sets, for example ``cmake -DLUA=5.3``
Example accel-ppp configuration:
.. code-block:: sh
[ipoe]
lua-file=/etc/accel-ppp.lua
username=lua:username_func
Create /etc/accel-ppp.lua and edit. Example for D-link switches with Option 82:
.. code-block:: sh
#!lua
function username_func(pkt)
v,b1,b2,b3,b4=string.unpack(pkt:agent_remote_id():sub(-4),'bbbb')
ip=b1..'.'..b2..'.'..b3..'.'..b4
v,port=string.unpack(string.sub(pkt:agent_circuit_id(),'-1'),'b')
local username=ip..'-'..port
-- print(username)
return username
end
Object **pkt** has next functions:
**hdr(name)**
Will return value which contained in DHCP packet header. ``name`` may receive next params: ``xid``, ``ciaddr``, ``giaddr``, ``chaddr``.
**ifname()**
Will return interface name which received packet.
**ipaddr()**
Will return client ip address exist in packet header.
**hwaddr()**
Will return client MAC address.
**vlan()**
Will return client VLAN.
.. code-block:: sh
local vlan = pkt:vlan()
local svid = bit.rshift(vlan,16)
local cvid = bit.band(vlan,0xffff)
**options()**
Will return table which contains number of DHCP option in received packet.
**option(num)**
Will return value with option number ``num``.
**agent_circuit_id()**
Will return ``agent_circuit_id`` option 82.
**agent_remote_id()**
Will return ``agent_remote_id`` option 82.
.. admonition:: Note:
All function return type ``string``, except for ``options()``
Also to accel-ppp includes packet **lpack** for disassemble binary data.
It add to object ``string`` additional function ``unpack(binary, fmt)``, where ``binary`` is string which contain binary data, and ``fmt`` is data format. To ``fmt`` may be sets next data types:
**z** - zero terminated string
**p** - string precended by length byte
**P** - string precended by length word
**f** - float
**d** - double
**c** - int8_t
**b** - uint8_t
**h** - int16_t
**H** - uint16_t
**i** - int32_t
**I** - uint32_t
**l** - int64_t
**L** - uint64_t
**<** - little endian
**>** - big endian
**=** - native endian
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