trusty (3) Net::SIP::Util.3pm.gz

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).