+my $CRLF = "\x0D\x0A";
+my $max_payload_size = 128*1024;
+
+my $build_web_socket_request = sub {
+ my ($host, $path, $ticket, $termproxy) = @_;
+
+ my $key = '';
+ $key .= chr(int(rand(256))) for 1 .. 16;
+ my $enckey = MIME::Base64::encode_base64($key, '');
+
+ my $encticket = uri_escape($ticket);
+ my $cookie = "PVEAuthCookie=$encticket; path=/; secure;";
+
+ $path .= "?port=$termproxy->{port}" .
+ "&vncticket=" . uri_escape($termproxy->{ticket});
+
+ my $request = "GET $path HTTP/1.1$CRLF"
+ . "Upgrade: WebSocket$CRLF"
+ . "Connection: Upgrade$CRLF"
+ . "Host: $host$CRLF"
+ . "Sec-WebSocket-Key: $enckey$CRLF"
+ . "Sec-WebSocket-Version: 13$CRLF"
+ . "Sec-WebSocket-Protocol: binary$CRLF"
+ . "Cookie: $cookie$CRLF"
+ . "$CRLF";
+
+ return ($request, $enckey);
+};
+
+my $create_websockt_frame = sub {
+ my ($payload) = @_;
+
+ my $string = "\x82"; # binary frame
+ my $payload_len = length($payload);
+ if ($payload_len <= 125) {
+ $string .= pack 'C', $payload_len | 128;
+ } elsif ($payload_len <= 0xffff) {
+ $string .= pack 'C', 126 | 128;
+ $string .= pack 'n', $payload_len;
+ } else {
+ $string .= pack 'C', 127 | 128;
+ $string .= pack 'Q>', $payload_len;
+ }
+
+ $string .= pack 'N', 0; # we simply use 0 as mask
+ $string .= $payload;
+
+ return $string;
+};
+
+my $parse_web_socket_frame = sub {
+ my ($wsbuf_ref) = @_;
+
+ my $payload;
+ my $req_close = 0;
+
+ while (my $len = length($$wsbuf_ref)) {
+ last if $len < 2;
+
+ my $hdr = unpack('C', substr($$wsbuf_ref, 0, 1));
+ my $opcode = $hdr & 0b00001111;
+ my $fin = $hdr & 0b10000000;
+
+ die "received fragmented websocket frame\n" if !$fin;
+
+ my $rsv = $hdr & 0b01110000;
+ die "received websocket frame with RSV flags\n" if $rsv;
+
+ my $payload_len = unpack 'C', substr($$wsbuf_ref, 1, 1);
+
+ my $masked = $payload_len & 0b10000000;
+ die "received masked websocket frame from server\n" if $masked;
+
+ my $offset = 2;
+ $payload_len = $payload_len & 0b01111111;
+ if ($payload_len == 126) {
+ last if $len < 4;
+ $payload_len = unpack('n', substr($$wsbuf_ref, $offset, 2));
+ $offset += 2;
+ } elsif ($payload_len == 127) {
+ last if $len < 10;
+ $payload_len = unpack('Q>', substr($$wsbuf_ref, $offset, 8));
+ $offset += 8;
+ }
+
+ die "received too large websocket frame (len = $payload_len)\n"
+ if ($payload_len > $max_payload_size) || ($payload_len < 0);
+
+ last if $len < ($offset + $payload_len);
+
+ my $data = substr($$wsbuf_ref, 0, $offset + $payload_len, ''); # now consume data
+
+ my $frame_data = substr($data, $offset, $payload_len);
+
+ $payload = '' if !defined($payload);
+ $payload .= $frame_data;
+
+ if ($opcode == 1 || $opcode == 2) {
+ # continue
+ } elsif ($opcode == 8) {
+ my $statuscode = unpack ("n", $frame_data);
+ $req_close = 1;
+ } else {
+ die "received unhandled websocket opcode $opcode\n";
+ }
+ }
+
+ return ($payload, $req_close);
+};
+
+my $full_write = sub {
+ my ($fh, $data) = @_;
+
+ my $len = length($data);
+ my $todo = $len;
+ my $offset = 0;
+ while(1) {
+ my $nr = syswrite($fh, $data, $todo, $offset);
+ if (!defined($nr)) {
+ next if $! == EINTR || $! == EAGAIN;
+ die "console write error - $!\n"
+ }
+ $offset += $nr;
+ $todo -= $nr;
+ last if $todo <= 0;
+ }
+
+ return $len;
+};
+
+# Takes an escape character with an optional '^' prefix and returns an escape
+# character code.
+my $escapekey_to_char = sub {
+ my ($def) = @_;
+ if ($def =~ /^\^?([a-zA-Z])$/) {
+ return 1 + ord(lc($1)) - ord('a');
+ }
+ die "bad escape key definition: $def\n";
+};
+