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::Stream 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_*" options are omitted, the module will attempt to provide them by quering the result of IO::Socket::SSL's "default_ca" function. Otherwise, the module will print a warning and set "SSL_VERIFY_NONE" instead.

LOOP METHODS

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

SSL_upgrade

   ( $stream or $socket ) = $loop->SSL_upgrade( %params )->get;

This method upgrades a given stream filehandle into an SSL-wrapped stream, returning a future which will yield the given stream object or socket.

Takes the following parameters:

handle => IO::Async::Stream | IO

The "IO::Async::Stream" object containing the IO handle of an already-established connection to act as the transport for SSL; or the plain IO socket handle itself.

If an "IO::Async::Stream" is passed it will have the "reader" and "writer" functions set on it suitable for SSL use, and will be returned as the result from the future.

If a plain socket handle is passed, that will be returned from the future instead.

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.

The following legacy callback arguments are also supported, in case the returned future is not used:

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 will have appropriate SSL-compatible reader/writer functions attached.

 $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_connect

   $stream = $loop->SSL_connect( %params )->get;

This method performs a non-blocking connection to a given address or set of addresses, upgrades the socket to SSL, then yields a "IO::Async::Stream" object when the SSL handshake is complete.

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".

This method can also upgrade an existing "IO::Async::Stream" or subclass instance given as the "handle" argument, by setting the "reader" and "writer" functions.

SSL_connect (void)

   $loop->SSL_connect( %params,
      on_connected => sub { ... },
      on_stream => sub { ... },
   );

When not returning a future, this method also supports the "on_connected" and "on_stream" continuations.

In addition, the following arguments are then 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.

SSL_listen

   $loop->SSL_listen( %params )->get;

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_accept" 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_accept" 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.

SSL_upgrade

   $protocol->SSL_upgrade( %params )->get;

A shortcut to calling "$loop->SSL_upgrade". This method will unconfigure the "transport" of the Protocol, upgrade its underlying filehandle to SSL, then reconfigure it again with SSL reader and writer functions on it. It takes the same arguments as "$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>