use strict;
use warnings;
+use Errno qw(EINTR EAGAIN);
use JSON;
use URI::Escape;
use IO::Select;
use PVE::APIClient::Config;
my $CRLF = "\x0D\x0A";
-my $max_payload_size = 65536;
+my $max_payload_size = 128*1024;
my $build_web_socket_request = sub {
my ($host, $path, $ticket, $termproxy) = @_;
return ($payload, $req_close);
};
-my $client_exit = sub {
- my ($select, $web_socket, $old_termios) = @_;
-
- foreach my $fh ($select->handles) {
- $select->remove($fh);
-
- if ($fh == $web_socket) {
- if ($fh->connected) {
-
- # close connection
- # Opcode, mask, statuscode
- my $msg = "\x88" . pack('N', 0) . pack('n', 0);
- $fh->syswrite($msg);
- close($fh);
- }
+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;
}
- # switch back to blocking mode (else later shell commands will fail).
- STDIN->blocking(1);
+ return $len;
+};
- #
- # Reset the terminal parameters.
- #
- print "\e[24H\r\n";
- PVE::PTY::tcsetattr(*STDIN, $old_termios);
+# 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";
};
__PACKAGE__->register_method ({
my $config = PVE::APIClient::Config->load();
my $conn = PVE::APIClient::Config->remote_conn($config, $param->{remote});
+ # FIXME: This should come from $config
+ my $escape_char = $escapekey_to_char->('a');
+
# Get the real node from the resources endpoint
my $resource_list = $conn->get("api2/json/cluster/resources", { type => 'vm'});
my ($resource) = grep { $_->{type} eq "lxc" && $_->{vmid} eq $param->{vmid}} @$resource_list;
my ($request, $wskey) = $build_web_socket_request->(
$conn->{host}, "/$api_path/vncwebsocket", $conn->{ticket}, $termproxy);
- $web_socket->syswrite($request);
+ $full_write->($web_socket, $request);
my $wsbuf = '';
my $wb_socket_read_available_bytes = sub {
my $nr = $web_socket->sysread($wsbuf, $max_payload_size, length($wsbuf));
- die "web socket read error - $!\n" if $nr < 0;
+ if (!defined($nr) && !($! == EINTR || $! == EAGAIN)) {
+ die "web socket read error - $!\n";
+ }
return $nr;
};
# send auth again...
my $frame = $create_websockt_frame->($termproxy->{user} . ":" . $termproxy->{ticket} . "\n");
- $web_socket->syswrite($frame);
+ $full_write->($web_socket, $frame);
# Send resize command
my ($columns, $rows) = PVE::PTY::tcgetsize(*STDIN);
$frame = $create_websockt_frame->("1:$columns:$rows:");
- $web_socket->syswrite($frame);
+ $full_write->($web_socket, $frame);
# Set STDIN to "raw -echo" mode
my $old_termios = PVE::PTY::tcgetattr(*STDIN);
my $raw_termios = {%$old_termios};
- PVE::PTY::cfmakeraw($raw_termios);
- PVE::PTY::tcsetattr(*STDIN, $raw_termios);
- # And set it to non-blocking so we can every char with IO::Select.
- STDIN->blocking(0);
+ my $read_select = IO::Select->new;
+ my $write_select = IO::Select->new;
- my $select = IO::Select->new;
+ my $output_buffer = ''; # write buffer for STDOUT
+ my $websock_buffer = ''; # write buffer for $web_socket
- $web_socket->blocking(0);
- $select->add($web_socket);
- $select->add(fileno(STDIN));
+ eval {
+ $SIG{TERM} = $SIG{INT} = $SIG{KILL} = sub { die "received interrupt\n"; };
- my @messages;
- my $ctrl_a_pressed_before = 0;
- my $next_ping = time() + 3;
+ PVE::PTY::cfmakeraw($raw_termios);
+ PVE::PTY::tcsetattr(*STDIN, $raw_termios);
- eval {
- while (1) {
- # Ping server every 3 seconds.
- my $now = time();
- if ($now >= $next_ping) {
- push(@messages, $create_websockt_frame->("2"));
- $next_ping = $now + 3;
- }
+ # And set it to non-blocking so we can every char with IO::Select.
+ STDIN->blocking(0);
+ STDOUT->blocking(0);
+ $web_socket->blocking(0);
+ $read_select->add($web_socket);
+ my $input_fh = \*STDIN;
+ $read_select->add($input_fh);
- # Write
- foreach my $fh ($select->can_write(0.5)) {
- if ($fh == $web_socket and my $msg = shift @messages) {
- $fh->syswrite($msg, length($msg));
- }
- }
+ my $output_fh = \*STDOUT;
- # Read
- foreach my $fh ($select->can_read(0.5)) {
+ my $in_escape_sequence;
- # From Web Socket
- if ($fh == $web_socket) {
- # Read from WebSocket
- my $nr = $wb_socket_read_available_bytes->();
- my ($payload, $req_close) = $parse_web_socket_frame->(\$wsbuf);
+ my $winch_received = 0;
+ $SIG{WINCH} = sub { $winch_received = 1; };
- if ($payload ne "OK") {
- syswrite(\*STDOUT, $payload, length($payload));
- }
- }
+ my $check_terminal_size = sub {
+ my ($ncols, $nrows) = PVE::PTY::tcgetsize(*STDIN);
+ if ($ncols != $columns or $nrows != $rows) {
+ $columns = $ncols;
+ $rows = $nrows;
+ $websock_buffer .= $create_websockt_frame->("1:$columns:$rows:");
+ $write_select->add($web_socket);
+ }
+ $winch_received = 0;
+ };
- # From STDIN
- elsif ($fh == fileno(STDIN)) {
+ my $max_buffer_len = 256*1024;
- # Read from STDIN
- my $nr = read(\*STDIN, my $buff, 4096);
- if (!$nr) {
- next;
- }
+ my $drain_buffer = sub {
+ my ($fh, $buffer_ref) = @_;
- my $char = ord($buff);
+ my $len = length($$buffer_ref);
+ my $nr = syswrite($fh, $$buffer_ref);
+ if (!defined($nr)) {
+ return if $! == EINTR || $! == EAGAIN;
+ die "drain buffer - write error - $!\n";
+ }
+ return $nr if !$nr;
+ substr($$buffer_ref, 0, $nr, '');
+ $len = length($$buffer_ref);
+ $write_select->remove($fh) if !$len;
+ };
- if ($ctrl_a_pressed_before == 1 && $char == hex("0x71")) {
- $client_exit->($select, $web_socket, $old_termios);
- return;
+ while (1) {
+ while(my ($readable, $writable) = IO::Select->select($read_select, $write_select, undef, 3)) {
+ $check_terminal_size->() if $winch_received;
+
+ foreach my $fh (@$writable) {
+ if ($fh == $output_fh) {
+ $drain_buffer->($output_fh, \$output_buffer);
+ $read_select->add($web_socket) if length($output_buffer) <= $max_buffer_len;
+ } elsif ($fh == $web_socket) {
+ $drain_buffer->($web_socket, \$websock_buffer);
}
+ }
- if ($char == hex("0x01")) {
- if ($ctrl_a_pressed_before == 0) {
- $ctrl_a_pressed_before = 1;
+ foreach my $fh (@$readable) {
+
+ if ($fh == $web_socket) {
+ # Read from WebSocket
+
+ my $nr = $wb_socket_read_available_bytes->();
+ if (!defined($nr)) {
+ # wait
+ } elsif ($nr == 0) {
+ return; # EOF
+ } else {
+ my ($payload, $req_close) = $parse_web_socket_frame->(\$wsbuf);
+ if (defined($payload) && length($payload)) {
+ $output_buffer .= $payload;
+ $write_select->add($output_fh);
+ if (length($output_buffer) > $max_buffer_len) {
+ $read_select->remove($web_socket);
+ }
+ }
+ return if $req_close;
+ }
+
+ } elsif ($fh == $input_fh) {
+ # Read from STDIN
+
+ my $nr = sysread($input_fh, my $buff, 4096);
+ return if !$nr; # EOF or error
+
+ my $char = ord($buff);
+
+ # Handle escape sequences:
+ if ($in_escape_sequence) {
+ $in_escape_sequence = 0;
+ if ($char == 0x71) {
+ # (escape, 'q')
+ return;
+ } elsif ($char == $escape_char) {
+ # (escape, escape)
+ # Pass this one through as a single escapekey
+ } else {
+ # Unknown escape sequence
+ # We could generate a bell or something...
+ # but for now just skip it
+ next;
+ }
+ } elsif ($char == $escape_char) {
+ $in_escape_sequence = 1;
+ next;
}
- }
- else {
- $ctrl_a_pressed_before = 0;
- }
- push(@messages, $create_websockt_frame->("0:" . $nr . ":" . $buff));
+ # Pass the key through:
+ $websock_buffer .= $create_websockt_frame->("0:" . $nr . ":" . $buff);
+ $write_select->add($web_socket);
+ }
}
}
+ $check_terminal_size->() if $winch_received;
+
+ # got timeout
+ $websock_buffer .= $create_websockt_frame->("2"); # ping server to keep connection alive
+ $write_select->add($web_socket);
}
};
- print "ERROR: " . $@ . ".\n" if $@;
+ my $err = $@;
+
+ eval { # cleanup
+
+ # switch back to blocking mode (else later shell commands will fail).
+ STDIN->blocking(1);
+
+ if ($web_socket->connected) {
+ # close connection
+ $websock_buffer .= "\x88" . pack('N', 0) . pack('n', 0); # Opcode, mask, statuscode
+ $full_write->($web_socket, $websock_buffer);
+ $websock_buffer = '';
+ close($web_socket);
+ }
+
+ # Reset the terminal parameters.
+ $output_buffer .= "\e[24H\r\n";
+ $full_write->(\*STDOUT, $output_buffer);
+ $output_buffer = '';
+
+ PVE::PTY::tcsetattr(*STDIN, $old_termios);
+ };
+ warn $@ if $@; # show cleanup errors
- $client_exit->($select, $web_socket, $old_termios);
+ print STDERR "\nERROR: $err" if $err;
- return undef
+ return undef;
}});
__PACKAGE__->register_method ({
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