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implement basic websocket protocol
This commit is contained in:
Dietmar Maurer
parent
f211e13f7e
commit
1824383b71
@ -3,6 +3,11 @@ package PVE::APIClient::Commands::lxc;
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use strict;
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use warnings;
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use JSON;
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use URI::Escape;
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use IO::Select;
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use IO::Socket::SSL;
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use MIME::Base64;
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use Digest::SHA;
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use PVE::Tools;
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use PVE::JSONSchema qw(get_standard_option);
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@ -11,6 +16,145 @@ use PVE::CLIHandler;
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use base qw(PVE::CLIHandler);
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use PVE::APIClient::Config;
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my $CRLF = "\x0D\x0A";
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my $max_payload_size = 65536;
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my $build_web_socket_request = sub {
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my ($path, $ticket, $termproxy) = @_;
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my $key = '';
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$key .= chr(int(rand(256))) for 1 .. 16;
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my $enckey = MIME::Base64::encode_base64($key, '');
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my $encticket = uri_escape($ticket);
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my $cookie = "PVEAuthCookie=$encticket; path=/; secure;";
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$path .= "?port=$termproxy->{port}" .
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"&vncticket=" . uri_escape($termproxy->{ticket});
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my $request = "GET $path HTTP/1.1$CRLF"
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. "Upgrade: WebSocket$CRLF"
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. "Connection: Upgrade$CRLF"
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. "Sec-WebSocket-Key: $enckey$CRLF"
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. "Sec-WebSocket-Version: 13$CRLF"
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. "Sec-WebSocket-Protocol: binary$CRLF"
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. "Cookie: $cookie$CRLF"
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. "$CRLF";
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return ($request, $enckey);
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};
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# FIXME: share this code with websockt code in PVE/APIServer/AnyEvent.pm ?
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my $create_websockt_frame = sub {
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my ($payload) = @_;
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my $string = "\x82"; # binary frame
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my $payload_len = length($payload);
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if ($payload_len <= 125) {
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$string .= pack 'C', $payload_len | 128;
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} elsif ($payload_len <= 0xffff) {
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$string .= pack 'C', 126 | 128;
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$string .= pack 'n', $payload_len;
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} else {
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$string .= pack 'C', 127 | 128;
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$string .= pack 'Q>', $payload_len;
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}
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$string .= pack 'N', 0; # we simply use 0 as mask
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$string .= $payload;
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return $string;
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};
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# FIXME: share this code with websockt code in PVE/APIServer/AnyEvent.pm ?
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my $parse_web_socket_frame = sub {
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my ($wsbuf_ref, $binary, $is_server) = @_;
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my $wsbuf = $$wsbuf_ref;
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my $payload;
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my $req_close = 0;
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while (my $len = length($wsbuf)) {
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last if $len < 2;
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my $hdr = unpack('C', substr($wsbuf, 0, 1));
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my $opcode = $hdr & 0b00001111;
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my $fin = $hdr & 0b10000000;
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die "received fragmented websocket frame\n" if !$fin;
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my $rsv = $hdr & 0b01110000;
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die "received websocket frame with RSV flags\n" if $rsv;
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my $payload_len = unpack 'C', substr($wsbuf, 1, 1);
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my $masked = $payload_len & 0b10000000;
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if ($is_server) {
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die "received unmasked websocket frame from client\n" if !$masked;
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} else {
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die "received masked websocket frame from server\n" if $masked;
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}
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my $offset = 2;
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$payload_len = $payload_len & 0b01111111;
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if ($payload_len == 126) {
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last if $len < 4;
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$payload_len = unpack('n', substr($wsbuf, $offset, 2));
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$offset += 2;
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} elsif ($payload_len == 127) {
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last if $len < 10;
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$payload_len = unpack('Q>', substr($wsbuf, $offset, 8));
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$offset += 8;
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}
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die "received too large websocket frame (len = $payload_len)\n"
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if ($payload_len > $max_payload_size) || ($payload_len < 0);
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my @mask = (0, 0, 0, 0);
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if ($masked) {
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last if $len < $offset + 4;
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@mask = (unpack('C', substr($wsbuf, $offset+0, 1)),
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unpack('C', substr($wsbuf, $offset+1, 1)),
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unpack('C', substr($wsbuf, $offset+2, 1)),
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unpack('C', substr($wsbuf, $offset+3, 1)));
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$offset += 4;
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}
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last if $len < ($offset + $payload_len);
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my $data = substr($wsbuf, 0, $offset + $payload_len, ''); # now consume data
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my $frame_data = substr($data, $offset, $payload_len);
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if ($masked) {
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for (my $i = 0; $i < $payload_len; $i++) {
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my $d = unpack('C', substr($frame_data, $i, 1));
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my $n = $d ^ $mask[$i % 4];
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substr($frame_data, $i, 1, pack('C', $n));
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}
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}
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$frame_data = decode_base64($frame_data) if !$binary;
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$payload = '' if !defined($payload);
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$payload .= $frame_data;
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if ($opcode == 1 || $opcode == 2) {
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# continue
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} elsif ($opcode == 8) {
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my $statuscode = unpack ("n", $frame_data);
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$req_close = 1;
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} else {
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die "received unhandled websocket opcode $opcode\n";
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}
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}
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return ($payload, $req_close);
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};
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__PACKAGE__->register_method ({
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name => 'enter',
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path => 'enter',
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@ -31,14 +175,89 @@ __PACKAGE__->register_method ({
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my ($param) = @_;
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my $conn = PVE::APIClient::Config::get_remote_connection($param->{remote});
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my $node = 'localhost'; # ??
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# Get the real node from the resources endpoint
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my $resource_list = $conn->get("api2/json/cluster/resources", { type => 'vm'});
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my ($resource) = grep { $_->{type} eq "lxc" && $_->{vmid} eq $param->{vmid}} @$resource_list;
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die "container '$param->{vmid}' does not exist\n"
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if !(defined($resource) && defined($resource->{node}));
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my $node = $resource->{node};
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my $api_path = "api2/json/nodes/$node/lxc/$param->{vmid}";
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my $res = $conn->get($api_path, {});
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my $termproxy = $conn->post("${api_path}/termproxy", {});
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print to_json($res, { pretty => 1, canonical => 1});
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die "implement me";
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my $web_socket = IO::Socket::SSL->new(
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PeerHost => $conn->{host},
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PeerPort => $conn->{port},
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SSL_verify_mode => SSL_VERIFY_NONE, # fixme: ???
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timeout => 30) ||
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die "failed to connect: $!\n";
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# WebSocket Handshake
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my ($request, $wskey) = $build_web_socket_request->(
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"/$api_path/vncwebsocket", $conn->{ticket}, $termproxy);
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$web_socket->syswrite($request);
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my $wsbuf = '';
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my $wb_socket_read_available_bytes = sub {
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my $nr = $web_socket->sysread($wsbuf, $max_payload_size, length($wsbuf));
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die "web socket read error - $!\n" if $nr < 0;
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return $nr;
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};
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my $raw_response = '';
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while(1) {
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my $nr = $wb_socket_read_available_bytes->();
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if ($wsbuf =~ s/^(.*?)$CRLF$CRLF//s) {
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$raw_response = $1;
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last;
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}
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last if !$nr;
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};
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# Note: we keep any remaining data in $wsbuf
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my $response = HTTP::Response->parse($raw_response);
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# Note: Digest::SHA::sha1_base64 has wrong padding
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my $wsaccept = Digest::SHA::sha1_base64("${wskey}258EAFA5-E914-47DA-95CA-C5AB0DC85B11") . "=";
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die "got invalid websocket reponse: $raw_response\n"
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if !(($response->code == 101) &&
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($response->header('connection') eq 'upgrade') &&
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($response->header('upgrade') eq 'websocket') &&
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($response->header('sec-websocket-protocol') eq 'binary') &&
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($response->header('sec-websocket-accept') eq $wsaccept));
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# send auth again...
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my $frame = $create_websockt_frame->($termproxy->{user} . ":" . $termproxy->{ticket} . "\n");
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$web_socket->syswrite($frame);
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my $select = IO::Select->new;
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$web_socket->blocking(0);
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$select->add($web_socket);
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while(my @ready = $select->can_read) {
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foreach my $fh (@ready) {
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if ($fh == $web_socket) {
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my $nr = $wb_socket_read_available_bytes->();
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my ($payload, $req_close) = $parse_web_socket_frame->(\$wsbuf, 1);
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print "GOT: $payload\n" if defined($payload);
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last if $req_close;
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last if !$nr; # eos
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} else {
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die "internal error - unknown handle";
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}
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}
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}
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}});
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