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=head1 NAME |
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AnyEvent::MP::Transport - actual transport protocol |
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|
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=head1 SYNOPSIS |
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|
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use AnyEvent::MP::Transport; |
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|
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=head1 DESCRIPTION |
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|
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This is the superclass for MP transports, most of which is considered an |
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implementation detail. |
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|
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Future versions might document the actual protocol. |
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|
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=head1 FUNCTIONS/METHODS |
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|
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=over 4 |
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|
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=cut |
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|
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package AnyEvent::MP::Transport; |
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|
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use common::sense; |
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|
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use Scalar::Util; |
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use MIME::Base64 (); |
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use Storable (); |
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|
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use AE (); |
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use AnyEvent::Socket (); |
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use AnyEvent::Handle (); |
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use AnyEvent::MP (); |
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|
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use base Exporter::; |
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|
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our $VERSION = '0.0'; |
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our $PROTOCOL_VERSION_MAJOR = 0; |
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our $PROTOCOL_VERSION_MINOR = 0; |
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|
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=item $listener = mp_listener $host, $port, <constructor-args>, $cb->($transport) |
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|
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Creates a listener on the given host/port using |
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C<AnyEvent::Socket::tcp_server>. |
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|
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See C<new>, below, for constructor arguments. |
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|
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Defaults for peerhost, peerport, fh and tls are provided. |
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|
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=cut |
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|
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sub mp_server($$@) { |
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my $cb = pop; |
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my ($host, $port, @args) = @_; |
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|
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AnyEvent::Socket::tcp_server $host, $port, sub { |
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my ($fh, $host, $port) = @_; |
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|
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$cb->(new AnyEvent::MP::Transport |
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fh => $fh, |
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peerhost => $host, |
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peerport => $port, |
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tls => "accept", |
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@args, |
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); |
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} |
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} |
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|
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=item new AnyEvent::MP::Transport |
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|
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# immediately starts negotiation |
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my $transport = new AnyEvent::MP::Transport |
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# fh OR connect is mandatory |
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fh => $filehandle, |
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connect => [$host, $port], |
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|
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# mandatory |
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on_recv => sub { receive-callback }, |
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on_error => sub { error-callback }, |
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|
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# optional |
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local_id => $identifier, |
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secret => "shared secret", |
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on_eof => sub { clean-close-callback }, |
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on_connect => sub { successful-connect-callback }, |
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|
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# tls support |
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tls => "accept|connect", |
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tls_ctx => AnyEvent::TLS, |
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peername => $peername, # for verification |
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; |
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|
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=cut |
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|
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sub new { |
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my ($class, %arg) = @_; |
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|
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my $self = bless \%arg, $class; |
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|
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$self->{queue} = []; |
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|
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{ |
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Scalar::Util::weaken (my $self = $self); |
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|
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if (exists $arg{connect}) { |
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$arg{tls} ||= "connect"; |
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$arg{tls_ctx} ||= { sslv2 => 0, sslv3 => 0, tlsv1 => 1, verify => 1, verify_peername => "https" }; |
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} |
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|
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$self->{hdl} = new AnyEvent::Handle |
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(exists $arg{fh} ? (fh => delete $arg{fh}) : (connect => delete $arg{connect})), |
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on_error => sub { |
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$self->error ($_[2]); |
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}, |
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peername => delete $arg{peername}, |
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; |
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|
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my $secret = delete $arg{secret} ? delete $arg{secret} : AnyEvent::MP::default_secret; |
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|
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# send greeting |
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my $lgreeting = "aemp;$PROTOCOL_VERSION_MAJOR;$PROTOCOL_VERSION_MINOR;AnyEvent::MP;$VERSION;" |
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. (MIME::Base64::encode_base64 AnyEvent::MP::nonce 33, "") . ";" |
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. "hmac_md6_64_256;" # hardcoded atm. |
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. "storable;" # hardcoded atm. |
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. "$self->{local_id};" |
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. (exists $arg{tls} && $arg{tls_ctx} ? "tls1.0=$arg{tls};" : ""); |
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|
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$self->{hdl}->push_write ("$lgreeting\012"); |
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|
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# expect greeting |
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$self->{hdl}->push_read (line => sub { |
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my $rgreeting = $_[1]; |
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|
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my ($aemp, $major, $minor, $provider, $provider_version, $nonce2, $auth, $framing, $rid, @kv) = split /;/, $rgreeting; |
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|
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if ($aemp ne "aemp") { |
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return $self->error ("unparsable greeting"); |
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} elsif ($major != $PROTOCOL_VERSION_MAJOR) { |
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return $self->error ("major version mismatch ($PROTOCOL_VERSION_MAJOR vs. $major)"); |
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} elsif ($auth ne "hmac_md6_64_256") { |
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return $self->error ("unsupported auth method ($auth)"); |
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} elsif ($framing ne "storable") { |
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return $self->error ("unsupported auth method ($auth)"); |
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} |
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|
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$self->{remote_id} = $rid; |
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|
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$self->{greeting} = { |
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provider => $provider, |
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provider_version => $provider_version, |
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}; |
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|
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/^([^=]+)(?:=(.*))?/ and $self->{greeting}{$1} = $2 |
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for @kv; |
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|
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if (exists $self->{tls} and $self->{tls_ctx} and exists $self->{greeting}{"tls1.0"}) { |
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if ($self->{tls} ne $self->{greeting}{"tls1.0"}) { |
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return $self->error ("TLS server/client mismatch"); |
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} |
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$self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx}); |
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} |
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|
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# auth |
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require Digest::MD6; |
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require Digest::HMAC_MD6; |
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|
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my $key = Digest::MD6::md6_hex ($secret); |
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my $lauth = Digest::HMAC_MD6::hmac_md6_base64 ($key, "$lgreeting$rgreeting", 64, 256); |
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my $rauth = Digest::HMAC_MD6::hmac_md6_base64 ($key, "$rgreeting$lgreeting", 64, 256); |
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$self->{hdl}->push_write ("$lauth\012"); |
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|
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$self->{hdl}->push_read (line => sub { |
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my ($hdl, $rauth2) = @_; |
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|
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if ($rauth2 ne $rauth) { |
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return $self->error ("authentication failure/shared secret mismatch"); |
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} |
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|
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my $queue = delete $self->{queue}; # we are connected |
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|
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$self->{on_connect}($self) |
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if $self->{on_connect}; |
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|
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$hdl->push_write (storable => $_) |
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for @$queue; |
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|
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my $rmsg; $rmsg = sub { |
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$_[0]->push_read (storable => $rmsg); |
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|
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$self->{on_recv}($self, $_[1]); |
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}; |
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$hdl->push_read (storable => $rmsg); |
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}); |
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}); |
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} |
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|
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$self |
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} |
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|
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sub error { |
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my ($self, $msg) = @_; |
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|
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$self->{on_error}($self, $msg); |
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$self->{hdl}->destroy; |
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} |
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sub send { |
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my ($self, $msg) = @_; |
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|
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exists $self->{queue} |
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? push @{ $self->{queue} }, $msg |
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: $self->{hdl}->push_write (storable => $msg); |
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} |
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|
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sub destroy { |
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my ($self) = @_; |
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|
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$self->{hdl}->destroy; |
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} |
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sub DESTROY { |
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my ($self) = @_; |
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$self->destroy; |
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} |
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=back |
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|
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=head1 SEE ALSO |
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|
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L<AnyEvent>. |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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|
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1 |
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