/ 
IO-Async-SSL-0.07
River stage two • 15 direct dependents • 15 total dependents
/ IO::Async::SSL

NAME

IO::Async::SSL - use SSL/TLS with IO::Async

SYNOPSIS

use IO::Async::Loop;
use IO::Async::SSL;

my $loop = IO::Async::Loop->new();

$loop->SSL_connect(
   host     => "www.example.com",
   service  => "https",

   on_stream => sub {
      my ( $stream ) = @_;

      $stream->configure(
         on_read => sub {
            ...
         },
      );

      $loop->add( $stream );

      ...
   },

   on_resolve_error => sub { print STDERR "Cannot resolve - $_[0]\n"; },
   on_connect_error => sub { print STDERR "Cannot connect\n"; },
   on_ssl_error     => sub { print STDERR "Cannot negotiate SSL - $_[-1]\n"; },
);

DESCRIPTION

This module extends existing IO::Async classes with extra methods to allow the use of SSL or TLS-based connections using IO::Socket::SSL. It does not directly provide any methods or functions of its own.

Primarily, it provides SSL_connect and SSL_listen, which yield IO::Socket::SSL-upgraded socket handles or IO::Async::SSLStream instances, and two forms of SSL_upgrade to upgrade an existing TCP connection to use SSL.

As an additional convenience, if the SSL_verify_mode and SSL_ca_file options are omitted, the module will attempt to load Mozilla::CA and, if successful, use it to set SSL_VERIFY_PEER. If Mozilla::CA cannot be loaded then it will set SSL_VERIFY_NONE.

LOOP METHODS

The following extra methods are added to IO::Async::Loop.

$loop->SSL_upgrade( %params )

This method upgrades a given stream filehandle into an SSL-wrapped stream, and will invoke the on_upgraded continuation when the handle is ready.

Takes the following parameters:

handle => IO

The IO handle of an already-established connection to act as the transport for SSL.

on_upgraded => CODE

A continuation that is invoked when the socket has been successfully upgraded to SSL. It will be passed an instance of an IO::Socket::SSL, which must be wrapped in an instance of IO::Async::SSLStream.

$on_upgraded->( $sslsocket )
on_error => CODE

A continuation that is invoked if IO::Socket::SSL detects an error while negotiating the upgrade.

$on_error->( $! )
SSL_server => BOOL

If true, indicates this is the server side of the connection.

In addition, any parameter whose name starts SSL_ will be passed to the IO::Socket::SSL constructor.

$loop->SSL_connect( %params )

This method performs a non-blocking connection to a given address or set of addresses, upgrades the socket to SSL, then invokes the continuation when the SSL handshake is complete. This can be either the on_connected or on_stream continuation; on_socket is not supported.

It takes all the same arguments as IO::Async::Loop::connect(). Any argument whose name starts SSL_ will be passed on to the IO::Socket::SSL constructor rather than the Loop's connect method. It is not required to pass the socktype option, as SSL implies this will be stream.

In addition, the following arguments are required:

on_ssl_error => CODE

A continuation that is invoked if IO::Socket::SSL detects an SSL-based error once the actual stream socket is connected.

If the on_connected continuation is used, the socket handle it yields will be a IO::Socket::SSL, which must be wrapped in IO::Async::SSLStream to be used by IO::Async. The on_stream continuation will already yield such an instance.

$loop->SSL_listen( %params )

This method sets up a listening socket using the addresses given, and will invoke the callback each time a new connection is accepted on the socket and the SSL handshake has been completed. This can be either the on_accepted or on_stream continuation; on_socket is not supported.

It takes all the same arguments as IO::Async::Loop::listen(). Any argument whose name starts SSL_ will be passed on to the IO::Socket::SSL constructor rather than the Loop's listen method. It is not required to pass the socktype option, as SSL implies this will be stream.

In addition, the following arguments are rquired:

on_ssl_error => CODE

A continuation that is invoked if IO::Socket::SSL detects an SSL-based error once the actual stream socket is connected.

The underlying IO::Socket::SSL socket will also require the server key and certificate for a server-mode socket. See its documentation for more details.

If the on_accepted continuation is used, the socket handle it yields will be a IO::Socket::SSL, which must be wrapped in IO::Async::SSLStream to be used by IO::Async. The on_stream continuation will already yield such an instance.

STREAM PROTOCOL METHODS

The following extra methods are added to IO::Async::Protocol::Stream.

$protocol->SSL_upgrade( %params )

A shortcut to calling $loop->SSL_upgrade. This method will unconfigure the transport of the Protocol, upgrade it to SSL, then reconfigure it again newly wrapped in a IO::Async::SSLStream instance. It takes the same arguments as $loop->SSL_upgrade, except that the handle argument is not required as it's taken from the Protocol's transport.

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>