[pox-dev] problem in discovery.py function
I am working on a security project, and unable to get the function of the following method which is in discovery.py def __init__ (self, send_cycle_time, ttl = 120): please help me in understanding this method
[pox-dev] problem in lldp.py
The following is code from lldp.py, I am unable to get use of parameters used in methods, please help me. def __init__ (self, raw=None, prev=None, **kw): packet_base.__init__(self) self.prev = prev self.next = None self.tlvs = [] if raw is not None: self.parse(raw) self._init(kw)
Re: [pox-dev] problem in lldp.py
The constructor arguments are basically the same for all classes in the packet library. raw is used if you are parsing a raw packet that's held in a bytes/str object. prev is mostly used internally to build chains of packet headers. That is, since most packet headers are preceded by other packet headers, a packet's .prev usually points to the preceding one. But most of the time you don't manually set it in the constructor; usually the right thing happens without you having to worry about it. If you're constructing a packet from scratch, you use keyword arguments. This isn't that useful for LLDP packets. It's more useful for things like TCP packets. It's more or less a shortcut so that you can do things like: mypacket = foo(bar = 42) Instead of: mypacket = foo() foo.bar = 42 LLDP packets don't really have many fields, though. They're basically just a list of TLVs. So the more common way to use it is just to create an empty LLDP header and append TLVs. discovery does this, for example: https://github.com/noxrepo/pox/blob/eel/pox/openflow/discovery.py#L189 -- Murphy On Sun, Jul 7, 2019 at 6:01 AM AASIF MNIT wrote: > The following is code from lldp.py, I am unable to get use of parameters > used in methods, please help me. > > > def __init__ (self, raw=None, prev=None, **kw): > packet_base.__init__(self) > > self.prev = prev > > self.next = None > self.tlvs = [] > > if raw is not None: > self.parse(raw) > > self._init(kw) >
Re: [pox-dev] problem in discovery.py function
So this is the constructor for LLDPSender. The docstring explains what the two parameters are. ttl probably isn't that important. send_cycle_time has to do with how fast discovery is sending packets. You don't usually construct LLDPSenders yourself, though. Normally, the discovery component (class Discovery) constructs them for you -- all you need to do is put "openflow.discovery" on the POX commandline. If you're trying to modify how discovery works or something, you might get better help if you explained what you were actually trying to accomplish. -- Murphy On Sun, Jul 7, 2019 at 5:59 AM AASIF MNIT wrote: > I am working on a security project, and unable to get the function of the > following method which is in discovery.py > > def __init__ (self, send_cycle_time, ttl = 120): > > please help me in understanding this method > >
