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).