Net::SIP::Util(3pm)					User Contributed Perl Documentation				       Net::SIP::Util(3pm)

NAME

       Net::SIP::Util - utility functions used by all of Net::SIP

SYNOPSIS

	 use Net::SIP::Util qw( create_rtp_sockets );
	 my ($port,@socks) = create_rtp_sockets( '192.168.0.10' ) or die;

DESCRIPTION

       This package implements various utility function used within various Net::SIP packages and partly usable for the user of Net::SIP too.

       Each of this functions is exportable, but none is exported per default.	All functions can be exported at once with the import flag ":all".

SUBROUTINES

       invoke_callback ( CALLBACK, @ARGS )
	   Invokes callback CALLBACK with additional args @ARGS.  CALLBACK can be:

	   A code reference
		   In this case it will be called as "$CALLBACK->(@ARGS)" and return the return value of this call.

	   A reference to a scalar
		   In this case the scalar will be set to $ARGS[0] and the rest of @ARGS will be ignored. If no @ARGS are given the scalar will be
		   set to TRUE.  It will return with the value of the scalar.

	   An object which has a method run
		   In this case it will call "$CALLBACK->run(@ARGS)" and return with the return value of this call.

	   A reference to an array
		   The first element of the array will be interpreted as code reference, while the rest as args, e.g. it will do:

		     my ($coderef,@cb_args) = @$CALLBACK;
		     return $coderef->( @cb_args, @ARGS );

	   A regular expression
		   In this case it will try to match all @ARGS against the regex.  If anything matches it will return TRUE, else FALSE.

       create_socket_to ( ADDR, [ PROTO ] )
	   Creates socket with protocol PROTO (default 'udp') on a local interface, from where ADDR is reachable.  This is done by first creating
	   a UDP socket with target ADDR and using getsockname(2) to find out the local address of this socket. The newly created socket than will
	   be bound to this address.

	   It will try to bind the socket to port 5060 (default SIP port).  If this fails it will try port 5062..5100 and if it cannot bind to any
	   of these ports it will just use any port which gets assigned by the OS.

	   For multihomed hosts where several addresses are bound to the same interface it will just use one of these addresses. If you need more
	   control about the address the socket is bound to (and which will be used as the local IP in outgoing packets) you need to create the
	   socket yourself.

	   In scalar context it just returns the newly created socket.	In array context it will return the socket and the "ip:port" the created
	   socket is bound to.	If the creation of the socket fails it will return "()" and set $!.

	   Example:

	     my ($sock,$ip_port) = create_socket_to ( '192.168.0.1' )
		   or die $!;

       create_rtp_sockets ( LADDR, [ RANGE, MINPORT, MAXPORT, TRIES ] )
	   This tries to allocate sockets for RTP. RTP consists usually of a data socket on an even port number and a control socket (RTCP) and
	   the following port. It will try to create these sockets. MINPORT is the minimal port number to use (default 2000), MAXPORT the highest
	   port (default MINPORT+10000), TRIES is the number of attempts it makes to create such socket pairs and defaults to 1000.

	   RANGE is the number of consecutive ports it needs to allocate and defaults to 2 (e.g. data and control socket).

	   Allocation will be done by choosing a random even number between MINPORT and MAXPORT and then trying to allocate all the sockets on
	   this and the following port numbers.

	   If the allocation fails after TRIES attempts were made it will return "()", otherwise it will return an array with at first the
	   starting port number followed by all the allocated sockets.

	   Example:

	     my ($port,$rtp_sock,$rtcp_sock) = create_rtp_sockets( '192.168.0.10' )
		   or die "allocation failed";

       sip_hdrval2parts ( KEY, VALUE )
	   Interprets VALUE as a value for the SIP header field KEY and splits it into the parts (prefix, parameter). Because for most keys the
	   delimiter is ";", but for some keys "," the field name KEY need to be known.

	   KEY needs to be normalized already (lower case, no abbrevation).

	   Returns array with initial data (up to first delimiter) and the parameters as hash.

	   Example for key 'to':

	     '"Silver; John" <silver@example.com>; tag=...; protocol=TCP'
	     -> ( '"Silver; John" <silver@example.com>', { tag => ..., protocol => 'TCP' } )

	   Example for key 'www-authenticate':

	     'Digest method="md5", qop="auth"'
	     -> ( 'Digest', { method => 'md5', qop => 'auth' } )

       sip_parts2hdrval ( KEY, PREFIX, \%PARAMETER )
	   Inverse function to sip_hdrval2parts, e.g constructs header value for KEY from PREFIX and %PARAMETER and returns value.

       sip_uri2parts ( URI )
	   Returns parts from URI. If called in scalar context it returns only the domain part. In array context it returns an array with the
	   following values:

	   domain - The domain part (including ports if any)
	   user - The user part of the SIP address
	   proto - The protocol, e.g. "sip" or "sips".
	   data - The part before any parameter, includes SIP address
	   param - A hash reference to any parameter, like in sip_hdrval2parts.
       sip_uri_eq ( URI1, URI2 )
	   Returns true if both URIs point to the same SIP address.  This compares user part case sensitive, domain part case insensitive (does no
	   DNS resolution) protocol and ports in domain (assumes default ports for protocol if no port is given).

perl v5.14.2							    2010-02-02						       Net::SIP::Util(3pm)