net::sip::dropper::byipport(3pm) [debian man page]
Net::SIP::Dropper::ByIPPort(3pm) User Contributed Perl Documentation Net::SIP::Dropper::ByIPPort(3pm) NAME
Net::SIP::Dropper::ByIPPort - drops SIP messages based on senders IP and port SYNOPSIS
use Net::SIP::Dropper::ByIPPort; my $drop_by_ipport = Net::SIP::Dropper::ByIPPort->new( database => '/path/to/database.drop', methods => [ 'REGISTER', '...', '' ], attempts => 10, interval => 60, ); my $dropper = Net::SIP::Dropper->new( cb => $drop_by_ipport ); my $chain = Net::SIP::ReceiveChain->new([ $dropper, ... ]); DESCRIPTION
With "Net::SIP::Dropper::ByIPPort" one can drop packets, if too much packets are received from the same IP and port within a specific interval. This is to stop bad behaving clients. CONSTRUCTOR
new ( ARGS ) ARGS is a hash with the following keys: database Optional file name of database or callback for storing/retrieving the data. If it is a callback it will be called with "$callback->(\%data)" to retrieve the data (%data will be updated) and "$callback->(\%data,true)" to save the data. No return value will be expected from the callback. %data contains the number of attempts from a specific IP, port at a specific time in the following format: "$data{ip}{port}{time} = count" attempts After how many attempts within the specific interval the packet will be dropped. Argument is required. interval The interval for attempts. Argument is required. methods Optional argument to restrict dropping to specific methods. Is array reference of method names, if one of the names is empty also responses will be considered. If not given all packets will be checked. METHODS
run ( PACKET, LEG, FROM ) This method is called as a callback from the Net::SIP::Dropper object. It returns true if the packet should be dropped, e.g. if there are too much packets from the same ip,port within the given interval. expire This method is called from within "run" but can also be called by hand. It will expire all entries which are outside of the interval. savedb This method is called from "expire" and "run" for saving to the database after changes, but can be called by hand to, useful if you made manual changes using the "data" method. data This method gives access to the internal hash which stores the attempts. An attempt from a specific IP and port and a specific time (as int, like time() gives) will be added to "$self->data->{ip}{port}{time}". By manually manipulating the hash one can restrict a specific IP,port forever (just set time to a large value and add a high number of attempts) or even restrict access for the whole IP (all ports) until time by using a port number of 0. After changes to the data it is advised to call "savedb". perl v5.14.2 2012-06-26 Net::SIP::Dropper::ByIPPort(3pm)
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Net::SIP::Endpoint(3pm) User Contributed Perl Documentation Net::SIP::Endpoint(3pm) NAME
Net::SIP::Endpoint - Endpoint for SIP packets (UAC,UAS) SYNOPSIS
my $disp = Net::SIP::Dispatcher->new(...); my $ua = Net::SIP::Endpoint->new($disp); $ua->register( from => 'sip:me@example.com', contact => 'sip:me@192.168.0.1', registrar => '192.168.0.10:5060' ); DESCRIPTION
The package implements a communication endpoint for SIP. This is usually a phone, but can also be a stateful proxy (because it retransmits packets itself). It provides methods to send arbitrary requests but also for sending special requests like INVITE or REGISTER. Together with Net::SIP::Endpoint::Context it implements the behavior of the endpoint. For incoming requests the endpoint usually communicates with the upper layer, the application, which is the interface to the user (e.g. let it ring for incoming calls, create response for call accepted if user picks up phone on incoming call etc). CONSTRUCTOR
new ( DISPATCHER ) Creates a new endpoint and sets it as the receiver for incoming packets at the Net::SIP::Dispatcher DISPATCHER. The endpoint will use DISPATCHER for outgoing packets and will receive incoming packets from it. METHODS
set_application ( APP ) Sets APP as the upper layer, e.g. the layer between the user and the endpoint object $self. APP is either an object which has a method receive or a callback usable by invoke_callback in Net::SIP::Util. The callback will be invoked with the following arguments: ENDPOINT This is the endpoint itself, e.g. $self. CTX The Net::SIP::Endpoint::Context object for the current call. REQUEST The Net::SIP::Request which caused the invocation of the call, e.g. an INVITE on new calls, ACK if the peer established the call, BYE if a call gets closed by the peer etc. LEG The Net::SIP::Leg object where the call came in. Together with FROM used to send response packet back to peer. FROM "ip:port" of the sender of the request. It will call into APP in various incoming requests, like: INVITE In this case APP should ring the user and while ringing send "180 Ringing" responses back to the peer, using "ENDPOINT->new_response". After some time it should send a final response (like "200 Ok" if the user accepted the call). ACK This is the sign, that the peer established the call. APP should now expect to process incoming RTP data and send RTP data itself. CANCEL, BYE This informs APP, that the call is closed. No need for the APP to send a response itself, this was already handled by the endpoint (because there is no choice of responses, it can hardly not accept a BYE). other requests Like OPTION,.. . Theseneed to be fully handled by APP, e.g. send the appropriate response back using "ENDPOINT->new_response". invite ( CTX, [ CALLBACK, BODY, %ARGS ] ) Creates a new INVITE request and delivers it to the peer. Simply calls new_request with the method 'INVITE'. See this method for information for the arguments. register ( %ARGS ) Registers endpoint at remote registrar. %ARGS needs to be filled as follows: registrar "ip:port" of registrar. Mandatory. from The address to register at the registrar. Mandatory. contact The contact, under which "from" will be registered. Mandatory. auth Authorization info, see method authorize in Net::SIP::Request for information about the format. Optional. expires Expires time. Optional, defaults to 900. callback Optional callback, e.g. called if requests come in from the peer on the call created for the registration. See invoke_callback in Net::SIP::Util for the format. All other keys will be used as header keys in generating the Net::SIP::Request object. new_request ( METHOD, CTX, [ CALLBACK, BODY, %ARGS ] ) Method is the uppercase name of the method for which a request should be generated. It can also be already a Net::SIP::Request object in which case no new request object will be generated, but the provided delivered. CTX is either an existing Net::SIP::Endpoint::Context object or a hash reference which will be used to construct one. It contains information about "from" and "to" etc. See constructor in Net::SIP::Endpoint::Context for details. In case of a hash reference auth and callid from ARGS will be used for the newly constructed context. If it is an existing CTX it has to be one which is already managed by this endpoint (e.g. one returned by this method), the endpoint will only manage CTX which it created itself so that a context cannot be shared between multiple endpoints. CALLBACK is a callback usable by invoke_callback in Net::SIP::Util. If defined it will be set up as the new default callback for the context. BODY is a string or an object for the SIP body accepted by the constructor of Net::SIP::Request. See there. If a response object is given as resp40x in ARGS it will be used to authorize the newly created request. Anything else in %ARGS will be used to construct the SIP header. See constructor in Net::SIP::Request. It returns the Net::SIP::Endpoint::Context object for this request which can be then used for further requests in the same call. cancel_invite ( CTX, REQUEST, CALLBACK ) Cancel the given request within the given context (e.g send CANCEL request). If no REQUEST is given it will cancel the most recent INVITE. Returns the number of requests canceled, e.g. 0 or 1. CALLBACK will be used as the callback for the CANCEL request it sends using new_request. close_context ( CTX ) Delete Net::SIP::Endpoint::Context object CTX from the list of active calls. receive ( PACKET, LEG, FROM ) Called from dispatcher on incoming packets. PACKET is the incoming Net::SIP::Packet, LEG the Net::SIP::Leg where the packet came in and FROM the "ip:port" of the sender. Just forwards to receive_request or receive_response based on the type of packet. receive_response ( RESPONSE, LEG, FROM ) Handles incoming response packets. Tries to find an active call based on the "Call-Id" header in the packet. If none was found it will drop the packet, otherwise call handle_response on the call context object (Net::SIP::Endpoint::Context). receive_request ( REQUEST, LEG, FROM ) Handles incoming requests. If there is already a call context for this Call-Id in the request it will use it, otherwise it will create a Net::SIP::Endpoint::Context object based on the information in the request ("from", "to", "contact",... ). Calls handle_request on the existing/new context object. new_response ( CTX, RESPONSE, LEG, ADDR ) Delivers Net::SIP::Response packet RESPONSE through the endpoints dispatcher to ADDR ("ip:port") using Net::SIP::Leg LEG. LEG and ADDR are usually the leg and the senders address where the associated request came in. CTX is the context from the call, where the associated request came in. If the response is a 2xx response to a INVITE and no "contact" header is given as required from the RFC it will add one based on the CTX. perl v5.14.2 2012-06-26 Net::SIP::Endpoint(3pm)