Fix open-h264 encoding for AMD GPU

This fixes deinitialisation ordering and makes it so that we don't start
listening until everything else is initialised.

.builds/archlinux.yml

@@ -14,6 +14,7 @@ packages:
   - sway
   - jq
   - lsof
+  - python-pycryptodomex # needed by vncdotool
   - vncdotool
 
 sources:

.gitignore

@@ -7,3 +7,4 @@ perf.*
 *.pem
 .vimrc
 .cache
+.vscode

FAQ.md

@@ -19,6 +19,16 @@ bindsym $mod+Pause mode passthrough
 This makes it so that when you press $mod+Pause, all keybindings, except the one
 to switch back, are disabled.
 
+Disable `floating_modifier` during the mode if it's set up in your config file
+and you wish to be able to use the same functionality in the nested desktop:
+```
+mode passthrough {
+    bindsym $mod+Pause mode default; floating_modifier $mod normal
+}
+bindsym $mod+Pause mode passthrough; floating_modifier none
+```
+Replace `$mod normal` with different arguments if applicable.
+
 **Q: Not all symbols show up when I'm typing. What can I do to fix this?**
 
 A: Try setting the keyboard layout in wayvnc to the one that most closely

FUNDING.yml

@@ -1 +1,2 @@
+github: any1
 patreon: andriyngvason

README.md

@@ -1,7 +1,7 @@
 # wayvnc
 
 [![Build and Unit Test](https://github.com/any1/wayvnc/actions/workflows/build.yml/badge.svg)](https://github.com/any1/wayvnc/actions/workflows/build.yml)
-[![builds.sr.ht status](https://builds.sr.ht/~andri/wayvnc/commits/master.svg)](https://builds.sr.ht/~andri/wayvnc/commits/master?)
+[![builds.sr.ht status](https://builds.sr.ht/~andri/wayvnc/pulls/1.svg)](https://builds.sr.ht/~andri/wayvnc/pulls/1?)
 [![Packaging status](https://repology.org/badge/tiny-repos/wayvnc.svg)](https://repology.org/project/wayvnc/versions)
 
 ## Introduction
@@ -122,8 +122,9 @@ For TLS, you'll need a private X509 key and a certificate. A self-signed key
 with a certificate can be generated like so:
 ```
 cd ~/.config/wayvnc
-openssl req -x509 -newkey rsa:4096 -sha256 -days 3650 -nodes \
-	-keyout tls_key.pem -out tls_cert.pem -subj /CN=localhost \
+openssl req -x509 -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 -sha384 \
+	-days 3650 -nodes -keyout tls_key.pem -out tls_cert.pem \
+	-subj /CN=localhost \
 	-addext subjectAltName=DNS:localhost,DNS:localhost,IP:127.0.0.1
 cd -
 ```

examples/auto-attach.py

@@ -0,0 +1,88 @@
+#!/usr/bin/env python
+
+import asyncio
+import json
+import re
+import os
+import glob
+
+class Program:
+	command_seq = 0
+	reader = None
+	writer = None
+	read_buffer = ""
+	message_queue = asyncio.Queue()
+	reply_queue = asyncio.Queue()
+	decoder = json.JSONDecoder()
+	tasks = []
+
+	async def read_message(self):
+		while True:
+			try:
+				result, index = self.decoder.raw_decode(self.read_buffer)
+				self.read_buffer = self.read_buffer[index:].lstrip()
+				return result
+			except json.JSONDecodeError:
+				data = await self.reader.read(4096)
+				self.read_buffer += data.decode('utf-8')
+
+	async def send_command(self, method, params = None):
+		cmd = {
+			"method": method,
+			"id": self.command_seq,
+		}
+
+		if not params is None:
+			cmd['params'] = params
+
+		self.command_seq += 1
+		self.writer.write(json.dumps(cmd).encode())
+		await self.writer.drain()
+
+		reply = await self.reply_queue.get()
+		self.reply_queue.task_done()
+		return reply['code'] == 0
+
+	async def attach(self, display):
+		return await self.send_command('attach', {'display': display})
+
+	async def attach_any(self):
+		for path in glob.iglob('/run/user/*/wayland-*'):
+			if path.endswith('.lock'):
+				continue
+
+			if await self.attach(path):
+				return True
+
+		return False
+
+	async def handle_detached(self):
+		while not await self.attach_any():
+			await asyncio.sleep(1.0)
+
+	async def process_message(self, message):
+		method = message['method']
+		if (method == 'detached'):
+			await self.handle_detached()
+
+	async def message_processor(self):
+		while True:
+			message = await self.read_message()
+			if 'method' in message:
+				await self.message_queue.put(message)
+			elif 'code' in message:
+				await self.reply_queue.put(message)
+
+	async def main(self):
+		self.reader, self.writer = await asyncio.open_unix_connection("/tmp/wayvncctl-0")
+		self.tasks.append(asyncio.create_task(self.message_processor()))
+
+		await self.attach_any()
+		await self.send_command("event-receive")
+
+		while True:
+			message = await self.message_queue.get()
+			await self.process_message(message)
+
+prog = Program()
+asyncio.run(prog.main())

include/ctl-commands.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022-2023 Jim Ramsay
+ * Copyright (c) 2023 Andri Yngvason
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -19,6 +20,8 @@
 #include <stdbool.h>
 
 enum cmd_type {
+	CMD_ATTACH,
+	CMD_DETACH,
 	CMD_HELP,
 	CMD_EVENT_RECEIVE,
 	CMD_CLIENT_LIST,
@@ -36,6 +39,9 @@ enum event_type {
 	EVT_CAPTURE_CHANGED,
 	EVT_CLIENT_CONNECTED,
 	EVT_CLIENT_DISCONNECTED,
+	EVT_DETACHED,
+	EVT_OUTPUT_ADDED,
+	EVT_OUTPUT_REMOVED,
 	EVT_UNKNOWN,
 };
 #define EVT_LIST_LEN EVT_UNKNOWN

include/ctl-server.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022 Jim Ramsay
+ * Copyright (c) 2023 Andri Yngvason
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -18,6 +19,8 @@
 
 #include "output.h"
 
+#include <sys/socket.h>
+
 struct ctl;
 struct cmd_response;
 
@@ -25,9 +28,12 @@ struct ctl_server_client;
 
 struct ctl_server_client_info {
 	int id;
-	const char *hostname;
-	const char *username;
-	const char *seat;
+	union {
+		struct sockaddr_storage address_storage;
+		struct sockaddr address;
+	};
+	const char* username;
+	const char* seat;
 };
 
 struct ctl_server_output {
@@ -41,6 +47,8 @@ struct ctl_server_output {
 
 struct ctl_server_actions {
 	void* userdata;
+	struct cmd_response* (*on_attach)(struct ctl*, const char* display);
+	struct cmd_response* (*on_detach)(struct ctl*);
 	struct cmd_response* (*on_output_cycle)(struct ctl*,
 			enum output_cycle_direction direction);
 	struct cmd_response* (*on_output_switch)(struct ctl*,
@@ -79,3 +87,8 @@ void ctl_server_event_disconnected(struct ctl*,
 
 void ctl_server_event_capture_changed(struct ctl*,
 		const char* captured_output);
+
+void ctl_server_event_detached(struct ctl*);
+
+void ctl_server_event_output_added(struct ctl*, const char* name);
+void ctl_server_event_output_removed(struct ctl*, const char* name);

include/keyboard.h

@@ -19,11 +19,13 @@
 #include <stdlib.h>
 #include <xkbcommon/xkbcommon.h>
 #include <stdbool.h>
+#include <neatvnc.h>
 
 #include "intset.h"
 
 struct zwp_virtual_keyboard_v1;
 struct table_entry;
+struct nvnc;
 
 struct keyboard {
 	struct zwp_virtual_keyboard_v1* virtual_keyboard;
@@ -44,3 +46,4 @@ void keyboard_destroy(struct keyboard* self);
 void keyboard_feed(struct keyboard* self, xkb_keysym_t symbol, bool is_pressed);
 void keyboard_feed_code(struct keyboard* self, xkb_keycode_t code,
 		bool is_pressed);
+enum nvnc_keyboard_led_state keyboard_get_led_state(const struct keyboard*);

include/output-management.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2023 The wayvnc authors
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+struct output;
+struct zwlr_output_manager_v1;
+
+void wlr_output_manager_setup(struct zwlr_output_manager_v1* output_manager);
+bool wlr_output_manager_resize_output(struct output* output,
+	uint16_t width, uint16_t height);
+void wlr_output_manager_destroy(void);

include/output.h

@@ -57,6 +57,7 @@ struct output {
 
 	bool is_dimension_changed;
 	bool is_transform_changed;
+	bool is_headless;
 
 	void (*on_dimension_change)(struct output*);
 	void (*on_transform_change)(struct output*);

include/util.h

@@ -19,6 +19,7 @@
 #include <sys/types.h>
 
 #define UDIV_UP(a, b) (((a) + (b) - 1) / (b))
+#define ALIGN_UP(a, b) ((b) * UDIV_UP((a), (b)))
 
 extern const char* wayvnc_version;
 

meson.build

@@ -1,7 +1,7 @@
 project(
 	'wayvnc',
 	'c',
-	version: '0.6.0',
+	version: '0.9-dev',
 	license: 'ISC',
 	default_options: [
 		'c_std=gnu11',
@@ -14,26 +14,30 @@ host_system = host_machine.system()
 prefix = get_option('prefix')
 
 c_args = [
-	'-DPROJECT_VERSION="@0@"'.format(meson.project_version()),
 	'-D_GNU_SOURCE',
 	'-DAML_UNSTABLE_API=1',
+	'-DWLR_USE_UNSTABLE=true',
 
 	'-Wno-unused-parameter',
 	'-Wno-missing-field-initializers',
 ]
 
+version = '"@0@"'.format(meson.project_version())
 git = find_program('git', native: true, required: false)
 if git.found()
-	git_describe = run_command([git, 'describe', '--tags', '--long'])
-	git_branch = run_command([git, 'rev-parse', '--abbrev-ref', 'HEAD'])
-	if git_describe.returncode() == 0 and git_branch.returncode() == 0
-		c_args += '-DGIT_VERSION="@0@ (@1@)"'.format(
-			git_describe.stdout().strip(),
+	git_commit = run_command([git, 'rev-parse', '--short', 'HEAD'], check: false)
+	git_branch = run_command([git, 'rev-parse', '--abbrev-ref', 'HEAD'], check: false)
+	if git_commit.returncode() == 0 and git_branch.returncode() == 0
+		version = '"v@0@-@1@ (@2@)"'.format(
+			meson.project_version(),
+			git_commit.stdout().strip(),
 			git_branch.stdout().strip(),
 		)
 	endif
 endif
 
+add_project_arguments('-DPROJECT_VERSION=@0@'.format(version), language: 'c')
+
 if buildtype != 'debug' and buildtype != 'debugoptimized'
 	c_args += '-DNDEBUG'
 endif
@@ -50,11 +54,18 @@ pixman = dependency('pixman-1')
 gbm = dependency('gbm', required: get_option('screencopy-dmabuf'))
 drm = dependency('libdrm')
 xkbcommon = dependency('xkbcommon', version: '>=1.0.0')
+wayland_server = dependency('wayland-server')
 wayland_client = dependency('wayland-client')
+wayland_client_protocol = dependency('wayland-protocols')
+wayland_cursor = dependency('wayland-cursor')
 jansson = dependency('jansson')
 
+# Cursor image
+x11_dep = dependency('x11')
+x11_fixes_dep = dependency('xfixes')
+
 aml_version = ['>=0.3.0', '<0.4.0']
-neatvnc_version = ['>=0.6.0', '<0.7.0']
+neatvnc_version = ['>=0.9', '<0.10.0']
 
 neatvnc_project = subproject(
 	'neatvnc',
@@ -75,7 +86,7 @@ else
 	neatvnc = dependency('neatvnc', version: neatvnc_version)
 endif
 
-inc = include_directories('include')
+inc = include_directories('include', '/usr/include/wlroots0.16')
 
 subdir('protocols')
 
@@ -86,6 +97,7 @@ sources = [
 	'src/screencopy.c',
 	'src/data-control.c',
 	'src/output.c',
+	'src/output-management.c',
 	'src/pointer.c',
 	'src/keyboard.c',
 	'src/seat.c',
@@ -115,6 +127,11 @@ dependencies = [
 	xkbcommon,
 	client_protos,
 	jansson,
+	x11_dep,
+	x11_fixes_dep,
+	wayland_client_protocol,
+	wayland_cursor,
+	wayland_server
 ]
 
 ctlsources = [
@@ -140,6 +157,10 @@ if host_system == 'linux' and get_option('systemtap') and cc.has_header('sys/sdt
 	config.set('HAVE_USDT', true)
 endif
 
+if cc.has_header('linux/dma-heap.h') and cc.has_header('linux/dma-buf.h')
+	config.set('HAVE_LINUX_DMA_HEAP', true)
+endif
+
 if cc.has_function('memfd_create')
 	config.set('HAVE_MEMFD', true)
 	config.set('HAVE_MEMFD_CREATE', true)

protocols/ext-transient-seat-v1.xml

@@ -0,0 +1,110 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="ext_transient_seat_v1">
+  <copyright>
+    Copyright © 2020 - 2023 Andri Yngvason
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice (including the next
+    paragraph) shall be included in all copies or substantial portions of the
+    Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+  </copyright>
+
+  <description summary="protocol for creating temporary seats">
+    The transient seat protocol can be used by privileged clients to create
+    independent seats that will be removed from the compositor when the client
+    destroys its transient seat.
+
+    This protocol is intended for use with virtual input protocols such as
+    "virtual_keyboard_unstable_v1" or "wlr_virtual_pointer_unstable_v1", both
+    of which allow the user to select a seat.
+
+    The "wl_seat" global created by this protocol does not generate input events
+    on its own, or have any capabilities except those assigned to it by other
+    protocol extensions, such as the ones mentioned above.
+
+    For example, a remote desktop server can create a seat with virtual inputs
+    for each remote user by following these steps for each new connection:
+     * Create a transient seat
+     * Wait for the transient seat to be created
+     * Locate a "wl_seat" global with a matching name
+     * Create virtual inputs using the resulting "wl_seat" global
+  </description>
+
+  <interface name="ext_transient_seat_manager_v1" version="1">
+    <description summary="transient seat manager">
+      The transient seat manager creates short-lived seats.
+    </description>
+
+    <request name="create">
+      <description summary="create a transient seat">
+        Create a new seat that is removed when the client side transient seat
+        object is destroyed.
+
+        The actual seat may be removed sooner, in which case the transient seat
+        object shall become inert.
+      </description>
+      <arg name="seat" type="new_id" interface="ext_transient_seat_v1"/>
+    </request>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the manager">
+        Destroy the manager.
+
+        All objects created by the manager will remain valid until they are
+        destroyed themselves.
+      </description>
+    </request>
+  </interface>
+
+  <interface name="ext_transient_seat_v1" version="1">
+    <description summary="transient seat handle">
+      When the transient seat handle is destroyed, the seat itself will also be
+      destroyed.
+    </description>
+
+    <event name="ready">
+      <description summary="transient seat is ready">
+        This event advertises the global name for the wl_seat to be used with
+        wl_registry_bind.
+
+        It is sent exactly once, immediately after the transient seat is created
+        and the new "wl_seat" global is advertised, if and only if the creation
+        of the transient seat was allowed.
+      </description>
+      <arg name="global_name" type="uint"/>
+    </event>
+
+    <event name="denied">
+      <description summary="transient seat creation denied">
+        The event informs the client that the compositor denied its request to
+        create a transient seat.
+
+        It is sent exactly once, immediately after the transient seat object is
+        created, if and only if the creation of the transient seat was denied.
+
+        After receiving this event, the client should destroy the object.
+      </description>
+    </event>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy transient seat">
+        When the transient seat object is destroyed by the client, the
+        associated seat created by the compositor is also destroyed.
+      </description>
+    </request>
+  </interface>
+</protocol>

protocols/meson.build

@@ -21,7 +21,9 @@ client_protocols = [
 	'xdg-output-unstable-v1.xml',
 	'linux-dmabuf-unstable-v1.xml',
 	'wlr-data-control-unstable-v1.xml',
+	'wlr-output-management-unstable-v1.xml',
 	'wlr-output-power-management-unstable-v1.xml',
+	'ext-transient-seat-v1.xml',
 ]
 
 client_protos_src = []

protocols/wlr-output-management-unstable-v1.xml

@@ -0,0 +1,601 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="wlr_output_management_unstable_v1">
+  <copyright>
+    Copyright © 2019 Purism SPC
+
+    Permission to use, copy, modify, distribute, and sell this
+    software and its documentation for any purpose is hereby granted
+    without fee, provided that the above copyright notice appear in
+    all copies and that both that copyright notice and this permission
+    notice appear in supporting documentation, and that the name of
+    the copyright holders not be used in advertising or publicity
+    pertaining to distribution of the software without specific,
+    written prior permission.  The copyright holders make no
+    representations about the suitability of this software for any
+    purpose.  It is provided "as is" without express or implied
+    warranty.
+
+    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+    THIS SOFTWARE.
+  </copyright>
+
+  <description summary="protocol to configure output devices">
+    This protocol exposes interfaces to obtain and modify output device
+    configuration.
+
+    Warning! The protocol described in this file is experimental and
+    backward incompatible changes may be made. Backward compatible changes
+    may be added together with the corresponding interface version bump.
+    Backward incompatible changes are done by bumping the version number in
+    the protocol and interface names and resetting the interface version.
+    Once the protocol is to be declared stable, the 'z' prefix and the
+    version number in the protocol and interface names are removed and the
+    interface version number is reset.
+  </description>
+
+  <interface name="zwlr_output_manager_v1" version="4">
+    <description summary="output device configuration manager">
+      This interface is a manager that allows reading and writing the current
+      output device configuration.
+
+      Output devices that display pixels (e.g. a physical monitor or a virtual
+      output in a window) are represented as heads. Heads cannot be created nor
+      destroyed by the client, but they can be enabled or disabled and their
+      properties can be changed. Each head may have one or more available modes.
+
+      Whenever a head appears (e.g. a monitor is plugged in), it will be
+      advertised via the head event. Immediately after the output manager is
+      bound, all current heads are advertised.
+
+      Whenever a head's properties change, the relevant wlr_output_head events
+      will be sent. Not all head properties will be sent: only properties that
+      have changed need to.
+
+      Whenever a head disappears (e.g. a monitor is unplugged), a
+      wlr_output_head.finished event will be sent.
+
+      After one or more heads appear, change or disappear, the done event will
+      be sent. It carries a serial which can be used in a create_configuration
+      request to update heads properties.
+
+      The information obtained from this protocol should only be used for output
+      configuration purposes. This protocol is not designed to be a generic
+      output property advertisement protocol for regular clients. Instead,
+      protocols such as xdg-output should be used.
+    </description>
+
+    <event name="head">
+      <description summary="introduce a new head">
+        This event introduces a new head. This happens whenever a new head
+        appears (e.g. a monitor is plugged in) or after the output manager is
+        bound.
+      </description>
+      <arg name="head" type="new_id" interface="zwlr_output_head_v1"/>
+    </event>
+
+    <event name="done">
+      <description summary="sent all information about current configuration">
+        This event is sent after all information has been sent after binding to
+        the output manager object and after any subsequent changes. This applies
+        to child head and mode objects as well. In other words, this event is
+        sent whenever a head or mode is created or destroyed and whenever one of
+        their properties has been changed. Not all state is re-sent each time
+        the current configuration changes: only the actual changes are sent.
+
+        This allows changes to the output configuration to be seen as atomic,
+        even if they happen via multiple events.
+
+        A serial is sent to be used in a future create_configuration request.
+      </description>
+      <arg name="serial" type="uint" summary="current configuration serial"/>
+    </event>
+
+    <request name="create_configuration">
+      <description summary="create a new output configuration object">
+        Create a new output configuration object. This allows to update head
+        properties.
+      </description>
+      <arg name="id" type="new_id" interface="zwlr_output_configuration_v1"/>
+      <arg name="serial" type="uint"/>
+    </request>
+
+    <request name="stop">
+      <description summary="stop sending events">
+        Indicates the client no longer wishes to receive events for output
+        configuration changes. However the compositor may emit further events,
+        until the finished event is emitted.
+
+        The client must not send any more requests after this one.
+      </description>
+    </request>
+
+    <event name="finished" type="destructor">
+      <description summary="the compositor has finished with the manager">
+        This event indicates that the compositor is done sending manager events.
+        The compositor will destroy the object immediately after sending this
+        event, so it will become invalid and the client should release any
+        resources associated with it.
+      </description>
+    </event>
+  </interface>
+
+  <interface name="zwlr_output_head_v1" version="4">
+    <description summary="output device">
+      A head is an output device. The difference between a wl_output object and
+      a head is that heads are advertised even if they are turned off. A head
+      object only advertises properties and cannot be used directly to change
+      them.
+
+      A head has some read-only properties: modes, name, description and
+      physical_size. These cannot be changed by clients.
+
+      Other properties can be updated via a wlr_output_configuration object.
+
+      Properties sent via this interface are applied atomically via the
+      wlr_output_manager.done event. No guarantees are made regarding the order
+      in which properties are sent.
+    </description>
+
+    <event name="name">
+      <description summary="head name">
+        This event describes the head name.
+
+        The naming convention is compositor defined, but limited to alphanumeric
+        characters and dashes (-). Each name is unique among all wlr_output_head
+        objects, but if a wlr_output_head object is destroyed the same name may
+        be reused later. The names will also remain consistent across sessions
+        with the same hardware and software configuration.
+
+        Examples of names include 'HDMI-A-1', 'WL-1', 'X11-1', etc. However, do
+        not assume that the name is a reflection of an underlying DRM
+        connector, X11 connection, etc.
+
+        If the compositor implements the xdg-output protocol and this head is
+        enabled, the xdg_output.name event must report the same name.
+
+        The name event is sent after a wlr_output_head object is created. This
+        event is only sent once per object, and the name does not change over
+        the lifetime of the wlr_output_head object.
+      </description>
+      <arg name="name" type="string"/>
+    </event>
+
+    <event name="description">
+      <description summary="head description">
+        This event describes a human-readable description of the head.
+
+        The description is a UTF-8 string with no convention defined for its
+        contents. Examples might include 'Foocorp 11" Display' or 'Virtual X11
+        output via :1'. However, do not assume that the name is a reflection of
+        the make, model, serial of the underlying DRM connector or the display
+        name of the underlying X11 connection, etc.
+
+        If the compositor implements xdg-output and this head is enabled,
+        the xdg_output.description must report the same description.
+
+        The description event is sent after a wlr_output_head object is created.
+        This event is only sent once per object, and the description does not
+        change over the lifetime of the wlr_output_head object.
+      </description>
+      <arg name="description" type="string"/>
+    </event>
+
+    <event name="physical_size">
+      <description summary="head physical size">
+        This event describes the physical size of the head. This event is only
+        sent if the head has a physical size (e.g. is not a projector or a
+        virtual device).
+      </description>
+      <arg name="width" type="int" summary="width in millimeters of the output"/>
+      <arg name="height" type="int" summary="height in millimeters of the output"/>
+    </event>
+
+    <event name="mode">
+      <description summary="introduce a mode">
+        This event introduces a mode for this head. It is sent once per
+        supported mode.
+      </description>
+      <arg name="mode" type="new_id" interface="zwlr_output_mode_v1"/>
+    </event>
+
+    <event name="enabled">
+      <description summary="head is enabled or disabled">
+        This event describes whether the head is enabled. A disabled head is not
+        mapped to a region of the global compositor space.
+
+        When a head is disabled, some properties (current_mode, position,
+        transform and scale) are irrelevant.
+      </description>
+      <arg name="enabled" type="int" summary="zero if disabled, non-zero if enabled"/>
+    </event>
+
+    <event name="current_mode">
+      <description summary="current mode">
+        This event describes the mode currently in use for this head. It is only
+        sent if the output is enabled.
+      </description>
+      <arg name="mode" type="object" interface="zwlr_output_mode_v1"/>
+    </event>
+
+    <event name="position">
+      <description summary="current position">
+        This events describes the position of the head in the global compositor
+        space. It is only sent if the output is enabled.
+      </description>
+      <arg name="x" type="int"
+        summary="x position within the global compositor space"/>
+      <arg name="y" type="int"
+        summary="y position within the global compositor space"/>
+    </event>
+
+    <event name="transform">
+      <description summary="current transformation">
+        This event describes the transformation currently applied to the head.
+        It is only sent if the output is enabled.
+      </description>
+      <arg name="transform" type="int" enum="wl_output.transform"/>
+    </event>
+
+    <event name="scale">
+      <description summary="current scale">
+        This events describes the scale of the head in the global compositor
+        space. It is only sent if the output is enabled.
+      </description>
+      <arg name="scale" type="fixed"/>
+    </event>
+
+    <event name="finished">
+      <description summary="the head has disappeared">
+        This event indicates that the head is no longer available. The head
+        object becomes inert. Clients should send a destroy request and release
+        any resources associated with it.
+      </description>
+    </event>
+
+    <!-- Version 2 additions -->
+
+    <event name="make" since="2">
+      <description summary="head manufacturer">
+        This event describes the manufacturer of the head.
+
+        This must report the same make as the wl_output interface does in its
+        geometry event.
+
+        Together with the model and serial_number events the purpose is to
+        allow clients to recognize heads from previous sessions and for example
+        load head-specific configurations back.
+
+        It is not guaranteed this event will be ever sent. A reason for that
+        can be that the compositor does not have information about the make of
+        the head or the definition of a make is not sensible in the current
+        setup, for example in a virtual session. Clients can still try to
+        identify the head by available information from other events but should
+        be aware that there is an increased risk of false positives.
+
+        It is not recommended to display the make string in UI to users. For
+        that the string provided by the description event should be preferred.
+      </description>
+      <arg name="make" type="string"/>
+    </event>
+
+    <event name="model" since="2">
+      <description summary="head model">
+        This event describes the model of the head.
+
+        This must report the same model as the wl_output interface does in its
+        geometry event.
+
+        Together with the make and serial_number events the purpose is to
+        allow clients to recognize heads from previous sessions and for example
+        load head-specific configurations back.
+
+        It is not guaranteed this event will be ever sent. A reason for that
+        can be that the compositor does not have information about the model of
+        the head or the definition of a model is not sensible in the current
+        setup, for example in a virtual session. Clients can still try to
+        identify the head by available information from other events but should
+        be aware that there is an increased risk of false positives.
+
+        It is not recommended to display the model string in UI to users. For
+        that the string provided by the description event should be preferred.
+      </description>
+      <arg name="model" type="string"/>
+    </event>
+
+    <event name="serial_number" since="2">
+      <description summary="head serial number">
+        This event describes the serial number of the head.
+
+        Together with the make and model events the purpose is to allow clients
+        to recognize heads from previous sessions and for example load head-
+        specific configurations back.
+
+        It is not guaranteed this event will be ever sent. A reason for that
+        can be that the compositor does not have information about the serial
+        number of the head or the definition of a serial number is not sensible
+        in the current setup. Clients can still try to identify the head by
+        available information from other events but should be aware that there
+        is an increased risk of false positives.
+
+        It is not recommended to display the serial_number string in UI to
+        users. For that the string provided by the description event should be
+        preferred.
+      </description>
+      <arg name="serial_number" type="string"/>
+    </event>
+
+    <!-- Version 3 additions -->
+
+    <request name="release" type="destructor" since="3">
+      <description summary="destroy the head object">
+        This request indicates that the client will no longer use this head
+        object.
+      </description>
+    </request>
+
+    <!-- Version 4 additions -->
+
+    <enum name="adaptive_sync_state" since="4">
+      <entry name="disabled" value="0" summary="adaptive sync is disabled"/>
+      <entry name="enabled" value="1" summary="adaptive sync is enabled"/>
+    </enum>
+
+    <event name="adaptive_sync" since="4">
+      <description summary="current adaptive sync state">
+        This event describes whether adaptive sync is currently enabled for
+        the head or not. Adaptive sync is also known as Variable Refresh
+        Rate or VRR.
+      </description>
+      <arg name="state" type="uint" enum="adaptive_sync_state"/>
+    </event>
+  </interface>
+
+  <interface name="zwlr_output_mode_v1" version="3">
+    <description summary="output mode">
+      This object describes an output mode.
+
+      Some heads don't support output modes, in which case modes won't be
+      advertised.
+
+      Properties sent via this interface are applied atomically via the
+      wlr_output_manager.done event. No guarantees are made regarding the order
+      in which properties are sent.
+    </description>
+
+    <event name="size">
+      <description summary="mode size">
+        This event describes the mode size. The size is given in physical
+        hardware units of the output device. This is not necessarily the same as
+        the output size in the global compositor space. For instance, the output
+        may be scaled or transformed.
+      </description>
+      <arg name="width" type="int" summary="width of the mode in hardware units"/>
+      <arg name="height" type="int" summary="height of the mode in hardware units"/>
+    </event>
+
+    <event name="refresh">
+      <description summary="mode refresh rate">
+        This event describes the mode's fixed vertical refresh rate. It is only
+        sent if the mode has a fixed refresh rate.
+      </description>
+      <arg name="refresh" type="int" summary="vertical refresh rate in mHz"/>
+    </event>
+
+    <event name="preferred">
+      <description summary="mode is preferred">
+        This event advertises this mode as preferred.
+      </description>
+    </event>
+
+    <event name="finished">
+      <description summary="the mode has disappeared">
+        This event indicates that the mode is no longer available. The mode
+        object becomes inert. Clients should send a destroy request and release
+        any resources associated with it.
+      </description>
+    </event>
+
+    <!-- Version 3 additions -->
+
+    <request name="release" type="destructor" since="3">
+      <description summary="destroy the mode object">
+        This request indicates that the client will no longer use this mode
+        object.
+      </description>
+    </request>
+  </interface>
+
+  <interface name="zwlr_output_configuration_v1" version="4">
+    <description summary="output configuration">
+      This object is used by the client to describe a full output configuration.
+
+      First, the client needs to setup the output configuration. Each head can
+      be either enabled (and configured) or disabled. It is a protocol error to
+      send two enable_head or disable_head requests with the same head. It is a
+      protocol error to omit a head in a configuration.
+
+      Then, the client can apply or test the configuration. The compositor will
+      then reply with a succeeded, failed or cancelled event. Finally the client
+      should destroy the configuration object.
+    </description>
+
+    <enum name="error">
+      <entry name="already_configured_head" value="1"
+        summary="head has been configured twice"/>
+      <entry name="unconfigured_head" value="2"
+        summary="head has not been configured"/>
+      <entry name="already_used" value="3"
+        summary="request sent after configuration has been applied or tested"/>
+    </enum>
+
+    <request name="enable_head">
+      <description summary="enable and configure a head">
+        Enable a head. This request creates a head configuration object that can
+        be used to change the head's properties.
+      </description>
+      <arg name="id" type="new_id" interface="zwlr_output_configuration_head_v1"
+        summary="a new object to configure the head"/>
+      <arg name="head" type="object" interface="zwlr_output_head_v1"
+        summary="the head to be enabled"/>
+    </request>
+
+    <request name="disable_head">
+      <description summary="disable a head">
+        Disable a head.
+      </description>
+      <arg name="head" type="object" interface="zwlr_output_head_v1"
+        summary="the head to be disabled"/>
+    </request>
+
+    <request name="apply">
+      <description summary="apply the configuration">
+        Apply the new output configuration.
+
+        In case the configuration is successfully applied, there is no guarantee
+        that the new output state matches completely the requested
+        configuration. For instance, a compositor might round the scale if it
+        doesn't support fractional scaling.
+
+        After this request has been sent, the compositor must respond with an
+        succeeded, failed or cancelled event. Sending a request that isn't the
+        destructor is a protocol error.
+      </description>
+    </request>
+
+    <request name="test">
+      <description summary="test the configuration">
+        Test the new output configuration. The configuration won't be applied,
+        but will only be validated.
+
+        Even if the compositor succeeds to test a configuration, applying it may
+        fail.
+
+        After this request has been sent, the compositor must respond with an
+        succeeded, failed or cancelled event. Sending a request that isn't the
+        destructor is a protocol error.
+      </description>
+    </request>
+
+    <event name="succeeded">
+      <description summary="configuration changes succeeded">
+        Sent after the compositor has successfully applied the changes or
+        tested them.
+
+        Upon receiving this event, the client should destroy this object.
+
+        If the current configuration has changed, events to describe the changes
+        will be sent followed by a wlr_output_manager.done event.
+      </description>
+    </event>
+
+    <event name="failed">
+      <description summary="configuration changes failed">
+        Sent if the compositor rejects the changes or failed to apply them. The
+        compositor should revert any changes made by the apply request that
+        triggered this event.
+
+        Upon receiving this event, the client should destroy this object.
+      </description>
+    </event>
+
+    <event name="cancelled">
+      <description summary="configuration has been cancelled">
+        Sent if the compositor cancels the configuration because the state of an
+        output changed and the client has outdated information (e.g. after an
+        output has been hotplugged).
+
+        The client can create a new configuration with a newer serial and try
+        again.
+
+        Upon receiving this event, the client should destroy this object.
+      </description>
+    </event>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the output configuration">
+        Using this request a client can tell the compositor that it is not going
+        to use the configuration object anymore. Any changes to the outputs
+        that have not been applied will be discarded.
+
+        This request also destroys wlr_output_configuration_head objects created
+        via this object.
+      </description>
+    </request>
+  </interface>
+
+  <interface name="zwlr_output_configuration_head_v1" version="4">
+    <description summary="head configuration">
+      This object is used by the client to update a single head's configuration.
+
+      It is a protocol error to set the same property twice.
+    </description>
+
+    <enum name="error">
+      <entry name="already_set" value="1" summary="property has already been set"/>
+      <entry name="invalid_mode" value="2" summary="mode doesn't belong to head"/>
+      <entry name="invalid_custom_mode" value="3" summary="mode is invalid"/>
+      <entry name="invalid_transform" value="4" summary="transform value outside enum"/>
+      <entry name="invalid_scale" value="5" summary="scale negative or zero"/>
+      <entry name="invalid_adaptive_sync_state" value="6" since="4"
+        summary="invalid enum value used in the set_adaptive_sync request"/>
+    </enum>
+
+    <request name="set_mode">
+      <description summary="set the mode">
+        This request sets the head's mode.
+      </description>
+      <arg name="mode" type="object" interface="zwlr_output_mode_v1"/>
+    </request>
+
+    <request name="set_custom_mode">
+      <description summary="set a custom mode">
+        This request assigns a custom mode to the head. The size is given in
+        physical hardware units of the output device. If set to zero, the
+        refresh rate is unspecified.
+
+        It is a protocol error to set both a mode and a custom mode.
+      </description>
+      <arg name="width" type="int" summary="width of the mode in hardware units"/>
+      <arg name="height" type="int" summary="height of the mode in hardware units"/>
+      <arg name="refresh" type="int" summary="vertical refresh rate in mHz or zero"/>
+    </request>
+
+    <request name="set_position">
+      <description summary="set the position">
+        This request sets the head's position in the global compositor space.
+      </description>
+      <arg name="x" type="int" summary="x position in the global compositor space"/>
+      <arg name="y" type="int" summary="y position in the global compositor space"/>
+    </request>
+
+    <request name="set_transform">
+      <description summary="set the transform">
+        This request sets the head's transform.
+      </description>
+      <arg name="transform" type="int" enum="wl_output.transform"/>
+    </request>
+
+    <request name="set_scale">
+      <description summary="set the scale">
+        This request sets the head's scale.
+      </description>
+      <arg name="scale" type="fixed"/>
+    </request>
+
+    <!-- Version 4 additions -->
+
+    <request name="set_adaptive_sync" since="4">
+      <description summary="enable/disable adaptive sync">
+        This request enables/disables adaptive sync. Adaptive sync is also
+        known as Variable Refresh Rate or VRR.
+      </description>
+      <arg name="state" type="uint" enum="zwlr_output_head_v1.adaptive_sync_state"/>
+    </request>
+  </interface>
+</protocol>

src/buffer.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020 - 2021 Andri Yngvason
+ * Copyright (c) 2020 - 2024 Andri Yngvason
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -31,10 +31,20 @@
 #include "buffer.h"
 #include "pixels.h"
 #include "config.h"
+#include "util.h"
 
 #ifdef ENABLE_SCREENCOPY_DMABUF
 #include <gbm.h>
-#endif
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+// #ifdef HAVE_LINUX_DMA_HEAP
+#include <linux/dma-buf.h>
+#include <linux/dma-heap.h>
+
+#define LINUX_CMA_PATH "/dev/dma_heap/linux,cma"
+//#endif // HAVE_LINUX_DMA_HEAP
+#endif // ENABLE_SCREENCOPY_DMABUF
 
 extern struct wl_shm* wl_shm;
 extern struct zwp_linux_dmabuf_v1* zwp_linux_dmabuf;
@@ -118,6 +128,81 @@ failure:
 }
 
 #ifdef ENABLE_SCREENCOPY_DMABUF
+#ifdef HAVE_LINUX_DMA_HEAP
+static bool have_linux_cma(void)
+{
+	return access(LINUX_CMA_PATH, R_OK | W_OK) == 0;
+}
+
+static int linux_cma_alloc(size_t size)
+{
+	int fd = open(LINUX_CMA_PATH, O_RDWR | O_CLOEXEC, 0);
+	if (fd < 0) {
+		nvnc_log(NVNC_LOG_ERROR, "Failed to open CMA device: %m");
+		return -1;
+	}
+
+	struct dma_heap_allocation_data data = {
+		.len = size,
+		.fd_flags = O_CLOEXEC | O_RDWR,
+	};
+
+	int r = ioctl(fd, DMA_HEAP_IOCTL_ALLOC, &data);
+	if (r < 0) {
+		nvnc_log(NVNC_LOG_ERROR, "Failed to allocate CMA buffer: %m");
+		return -1;
+	}
+	close(fd);
+
+        return data.fd;
+}
+
+// Some devices (mostly ARM SBCs) need CMA for hardware encoders.
+static struct gbm_bo* create_cma_gbm_bo(int width, int height, uint32_t fourcc)
+{
+	assert(gbm_device);
+
+	int bpp = pixel_size_from_fourcc(fourcc);
+	if (!bpp) {
+		nvnc_log(NVNC_LOG_PANIC, "Unsupported pixel format: %" PRIu32,
+				fourcc);
+	}
+
+	/* TODO: Get alignment through feedback mechanism.
+	 * Buffer sizes are aligned on both axes by 16 and we'll do the same
+	 * in the encoder, but this requirement should come from the encoder.
+	 */
+	int stride = bpp * ALIGN_UP(width, 16);
+
+	int fd = linux_cma_alloc(stride * ALIGN_UP(height, 16));
+	if (fd < 0) {
+		return NULL;
+	}
+
+	struct gbm_import_fd_modifier_data d = {
+		.format = fourcc,
+		.width = width,
+		.height = height,
+		// v4l2m2m doesn't support modifiers, so we use linear
+		.modifier = DRM_FORMAT_MOD_LINEAR,
+		.num_fds = 1,
+		.fds[0] = fd,
+		.offsets[0] = 0,
+		.strides[0] = stride,
+	};
+
+	struct gbm_bo* bo = gbm_bo_import(gbm_device, GBM_BO_IMPORT_FD_MODIFIER,
+			&d, 0);
+	if (!bo) {
+		nvnc_log(NVNC_LOG_DEBUG, "Failed to import dmabuf: %m");
+		close(fd);
+		return NULL;
+	}
+
+	return bo;
+}
+#endif // HAVE_LINUX_DMA_HEAP
+
 static struct wv_buffer* wv_buffer_create_dmabuf(int width, int height,
 		uint32_t fourcc)
 {
@@ -133,8 +218,17 @@ static struct wv_buffer* wv_buffer_create_dmabuf(int width, int height,
 	self->height = height;
 	self->format = fourcc;
 
-	self->bo = gbm_bo_create(gbm_device, width, height, fourcc,
-			GBM_BO_USE_RENDERING);
+// Checks not needed anymore. Fixed with SCANOUT and within neatvnc for most GPUs.
+// But this could still fail!
+//#ifdef HAVE_LINUX_DMA_HEAP
+	self->bo = have_linux_cma() ?
+		create_cma_gbm_bo(width, height, fourcc) :
+		gbm_bo_create(gbm_device, width, height, fourcc,
+				GBM_BO_USE_RENDERING | GBM_BO_USE_SCANOUT);
+//#endif
+//	self->bo = gbm_bo_create(gbm_device, width, height, fourcc,
+//				GBM_BO_USE_RENDERING);
+
 	if (!self->bo)
 		goto bo_failure;
 

src/ctl-client.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022-2023 Jim Ramsay
+ * Copyright (c) 2023 Andri Yngvason
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -353,17 +354,17 @@ static void pretty_client_list(json_t* data)
 	json_t* value;
 	json_array_foreach(data, i, value) {
 		char* id = NULL;
-		char* hostname = NULL;
+		char* address = NULL;
 		char* username = NULL;
 
-		json_unpack(value, "{s:s, s?s, s?s}", "id", &id, "hostname",
-				&hostname, "username", &username);
+		json_unpack(value, "{s:s, s?s, s?s}", "id", &id, "address",
+				&address, "username", &username);
 		printf("  %s: ", id);
 
 		if (username)
 			printf("%s@", username);
 
-		printf("%s\n", hostname ? hostname : "<unknown>");
+		printf("%s\n", address ? address : "<unknown>");
 	}
 }
 
@@ -403,6 +404,8 @@ static void pretty_print(json_t* data,
 	case CMD_OUTPUT_LIST:
 		pretty_output_list(data);
 		break;
+	case CMD_ATTACH:
+	case CMD_DETACH:
 	case CMD_CLIENT_DISCONNECT:
 	case CMD_OUTPUT_SET:
 	case CMD_OUTPUT_CYCLE:

src/ctl-commands.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022-2023 Jim Ramsay
+ * Copyright (c) 2023 Andri Yngvason
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -20,6 +21,19 @@
 #include <string.h>
 
 struct cmd_info ctl_command_list[] = {
+	[CMD_ATTACH] = { "attach",
+		"Attach to a running wayland compositor",
+		{
+			{ "display", "Display name", "<name>",
+				.positional = true },
+			{},
+		}
+
+	},
+	[CMD_DETACH] = { "detach",
+		"Detach from the wayland compositor",
+		{{}},
+	},
 	[CMD_HELP] = { "help",
 		"List all commands and events, or show usage of a specific command or event",
 		{
@@ -84,8 +98,8 @@ struct cmd_info ctl_command_list[] = {
 	{ "connection_count", \
 		"The total number of connected VNC clients " including " this one.", \
 		"<integer>" }, \
-	{ "hostname", \
-		"The hostname or IP address of this client (may be null)", \
+	{ "address", \
+		"The IP address of this client (may be null)", \
 		"<name|ip>" }, \
 	{ "username", \
 		"The username used to authentice this client (may be null).", \
@@ -110,6 +124,24 @@ struct cmd_info ctl_event_list[] = {
 		"Sent by waynvc when a VNC client disconnects",
 		{ CLIENT_EVENT_PARAMS("not including") }
 	},
+	[EVT_DETACHED] = {"detached",
+		"Sent after detaching from compositor",
+		{}
+	},
+	[EVT_OUTPUT_ADDED] = {"output-added",
+		"Sent when an output is added by the compositor",
+		{
+			{ "name", "Output name", "<string>" },
+			{}
+		}
+	},
+	[EVT_OUTPUT_REMOVED] = {"output-removed",
+		"Sent when an output is removed by the compositor",
+		{
+			{ "name", "Output name", "<string>" },
+			{}
+		}
+	},
 };
 
 enum cmd_type ctl_command_parse_name(const char* name)

src/ctl-server.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022-2023 Jim Ramsay
+ * Copyright (c) 2023 Andri Yngvason
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -26,6 +27,8 @@
 #include <neatvnc.h>
 #include <aml.h>
 #include <jansson.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
 
 #include "output.h"
 #include "ctl-commands.h"
@@ -46,6 +49,11 @@ struct cmd {
 	enum cmd_type type;
 };
 
+struct cmd_attach {
+	struct cmd cmd;
+	char display[128];
+};
+
 struct cmd_help {
 	struct cmd cmd;
 	char id[64];
@@ -105,6 +113,19 @@ static void cmd_response_destroy(struct cmd_response* self)
 	free(self);
 }
 
+static struct cmd_attach* cmd_attach_new(json_t* args,
+		struct jsonipc_error* err)
+{
+	const char* display = NULL;
+	if (json_unpack(args, "{s:s}", "display", &display) == -1) {
+		jsonipc_error_printf(err, EINVAL, "Missing display name");
+		return NULL;
+	}
+	struct cmd_attach* cmd = calloc(1, sizeof(*cmd));
+	strlcpy(cmd->display, display, sizeof(cmd->display));
+	return cmd;
+}
+
 static struct cmd_help* cmd_help_new(json_t* args,
 		struct jsonipc_error* err)
 {
@@ -185,6 +206,9 @@ static struct cmd* parse_command(struct jsonipc_request* ipc,
 	enum cmd_type cmd_type = ctl_command_parse_name(ipc->method);
 	struct cmd* cmd = NULL;
 	switch (cmd_type) {
+	case CMD_ATTACH:
+		cmd = (struct cmd*)cmd_attach_new(ipc->params, err);
+		break;
 	case CMD_HELP:
 		cmd = (struct cmd*)cmd_help_new(ipc->params, err);
 		break;
@@ -194,6 +218,7 @@ static struct cmd* parse_command(struct jsonipc_request* ipc,
 	case CMD_CLIENT_DISCONNECT:
 		cmd = (struct cmd*)cmd_disconnect_client_new(ipc->params, err);
 		break;
+	case CMD_DETACH:
 	case CMD_VERSION:
 	case CMD_EVENT_RECEIVE:
 	case CMD_CLIENT_LIST:
@@ -339,6 +364,25 @@ static struct ctl_server_client* ctl_server_client_next(struct ctl* self,
 	return self->actions.client_next(self, prev);
 }
 
+static int sockaddr_to_string(char* dst, size_t sz, const struct sockaddr* addr)
+{
+	struct sockaddr_in* sa_in = (struct sockaddr_in*)addr;
+	struct sockaddr_in6* sa_in6 = (struct sockaddr_in6*)addr;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		inet_ntop(addr->sa_family, &sa_in->sin_addr, dst, sz);
+		return 0;
+	case AF_INET6:
+		inet_ntop(addr->sa_family, &sa_in6->sin6_addr, dst, sz);
+		return 0;
+	}
+	nvnc_log(NVNC_LOG_DEBUG,
+			"Don't know how to convert sa_family %d to string",
+			addr->sa_family);
+	return -1;
+}
+
 static void ctl_server_client_get_info(struct ctl* self,
 		const struct ctl_server_client* client,
 		struct ctl_server_client_info* info)
@@ -361,15 +405,21 @@ static struct cmd_response* generate_vnc_client_list(struct ctl* self)
 		snprintf(id_str, sizeof(id_str), "%d", info.id);
 		json_t* packed = json_pack("{s:s}", "id", id_str);
 
-		if (info.hostname)
-			json_object_set_new(packed, "hostname",
-					json_string(info.hostname));
+		char address_string[256];
+		if (sockaddr_to_string(address_string, sizeof(address_string),
+					&info.address) == 0) {
+			json_object_set_new(packed, "address",
+					json_string(address_string));
+		}
 
 		if (info.username)
 			json_object_set_new(packed, "username",
 					json_string(info.username));
 
-		json_object_set_new(packed, "seat", json_string(info.seat));
+		if (info.seat)
+			json_object_set_new(packed, "seat",
+					json_string(info.seat));
+
 		json_array_append_new(response->data, packed);
 	}
 
@@ -404,6 +454,11 @@ static struct cmd_response* ctl_server_dispatch_cmd(struct ctl* self,
 	nvnc_log(NVNC_LOG_INFO, "Dispatching control client command '%s'", info->name);
 	struct cmd_response* response = NULL;
 	switch (cmd->type) {
+	case CMD_ATTACH:{
+		struct cmd_attach* c = (struct cmd_attach*)cmd;
+		response = self->actions.on_attach(self, c->display);
+		break;
+		}
 	case CMD_HELP:{
 		struct cmd_help* c = (struct cmd_help*)cmd;
 		response = generate_help_object(c->id, c->id_is_command);
@@ -420,6 +475,9 @@ static struct cmd_response* ctl_server_dispatch_cmd(struct ctl* self,
 		response = self->actions.on_disconnect_client(self, c->id);
 		break;
 		}
+	case CMD_DETACH:
+		response = self->actions.on_detach(self);
+		break;
 	case CMD_WAYVNC_EXIT:
 		response = self->actions.on_wayvnc_exit(self);
 		break;
@@ -863,9 +921,13 @@ json_t* pack_connection_event_params(
 	char id_str[64];
 	snprintf(id_str, sizeof(id_str), "%d", info->id);
 
+	char address_string[256];
+	bool have_addr = sockaddr_to_string(address_string,
+			sizeof(address_string), &info->address) == 0;
+
 	return json_pack("{s:s, s:s?, s:s?, s:s?, s:i}",
 			"id", id_str,
-			"hostname", info->hostname,
+			"address", have_addr ? address_string : NULL,
 			"username", info->username,
 			"seat", info->seat,
 			"connection_count", new_connection_count);
@@ -939,3 +1001,20 @@ void ctl_server_event_capture_changed(struct ctl* self,
 	ctl_server_enqueue_event(self, EVT_CAPTURE_CHANGED,
 			json_pack("{s:s}", "output", captured_output));
 }
+
+void ctl_server_event_detached(struct ctl* self)
+{
+	ctl_server_enqueue_event(self, EVT_DETACHED, json_object());
+}
+
+void ctl_server_event_output_added(struct ctl* self, const char* name)
+{
+	ctl_server_enqueue_event(self, EVT_OUTPUT_ADDED,
+			json_pack("{s:s}", "name", name));
+}
+
+void ctl_server_event_output_removed(struct ctl* self, const char* name)
+{
+	ctl_server_enqueue_event(self, EVT_OUTPUT_REMOVED,
+			json_pack("{s:s}", "name", name));
+}

src/keyboard.c

@@ -436,3 +436,18 @@ void keyboard_feed_code(struct keyboard* self, xkb_keycode_t code,
 		send_key(self, code, is_pressed);
 	}
 }
+
+enum nvnc_keyboard_led_state keyboard_get_led_state(
+		const struct keyboard* self)
+{
+	enum nvnc_keyboard_led_state led_state = 0;
+
+	if (xkb_state_led_name_is_active(self->state, XKB_LED_NAME_SCROLL))
+		led_state |= NVNC_KEYBOARD_LED_SCROLL_LOCK;
+	if (xkb_state_led_name_is_active(self->state, XKB_LED_NAME_NUM))
+		led_state |= NVNC_KEYBOARD_LED_NUM_LOCK;
+	if (xkb_state_led_name_is_active(self->state, XKB_LED_NAME_CAPS))
+		led_state |= NVNC_KEYBOARD_LED_CAPS_LOCK;
+
+	return led_state;
+}

src/output-management.c

@@ -0,0 +1,283 @@
+/*
+ * Copyright (c) 2023 The wayvnc authors
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <neatvnc.h>
+#include <string.h>
+#include <wayland-client.h>
+
+#include "output.h"
+#include "output-management.h"
+
+#include "wlr-output-management-unstable-v1.h"
+
+struct output_manager_head {
+	struct zwlr_output_head_v1* head;
+	struct wl_list link;
+	char* name;
+	bool enabled;
+};
+
+static struct wl_list heads;
+static uint32_t last_config_serial;
+static struct zwlr_output_manager_v1* wlr_output_manager;
+
+/* single head properties */
+static void output_head_name(void* data,
+		struct zwlr_output_head_v1* output_head, const char* name)
+{
+	struct output_manager_head* head = data;
+	nvnc_trace("Got head name: %s", name);
+	free(head->name);
+	head->name = strdup(name);
+}
+
+static void output_head_description(void* data,
+		struct zwlr_output_head_v1* output_head,
+		const char* description)
+{
+	nvnc_trace("Got head description: %s", description);
+}
+
+static void output_head_physical_size(void* data,
+		struct zwlr_output_head_v1* output_head,
+		int32_t width, int32_t height)
+{
+	nvnc_trace("Got head size: %dx%d", width, height);
+}
+
+static void output_head_mode(void* data,
+		struct zwlr_output_head_v1* output_head,
+		struct zwlr_output_mode_v1* mode)
+{
+	nvnc_trace("Got head mode");
+}
+
+static void output_head_enabled(void* data,
+		struct zwlr_output_head_v1* output_head, int32_t enabled)
+{
+	nvnc_trace("Got head enabled: %s", enabled ? "yes" : "no");
+	struct output_manager_head* head = data;
+	head->enabled = !!enabled;
+}
+
+static void output_head_current_mode(void* data,
+		struct zwlr_output_head_v1* output_head,
+		struct zwlr_output_mode_v1* mode)
+{
+	nvnc_trace("Got head current mode");
+}
+
+static void output_head_position(void* data,
+		struct zwlr_output_head_v1* output_head, int32_t x, int32_t y)
+{
+	nvnc_trace("Got head position: %d,%d", x, y);
+}
+
+static void output_head_transform(void* data,
+		struct zwlr_output_head_v1* output_head, int32_t transform)
+{
+	nvnc_trace("Got head transform: %d", transform);
+}
+
+static void output_head_scale(void* data,
+		struct zwlr_output_head_v1* output_head, wl_fixed_t scale_f)
+{
+	double scale = wl_fixed_to_double(scale_f);
+	nvnc_trace("Got head scale: %.2f", scale);
+}
+
+static void output_head_finished(void* data,
+		struct zwlr_output_head_v1* output_head)
+{
+	nvnc_trace("head gone, removing");
+	struct output_manager_head* head = data;
+	zwlr_output_head_v1_destroy(output_head);
+	wl_list_remove(&head->link);
+	free(head->name);
+	head->name = NULL;
+	head->head = NULL;
+	free(head);
+}
+
+struct zwlr_output_head_v1_listener wlr_output_head_listener = {
+	.name = output_head_name,
+	.description = output_head_description,
+	.physical_size = output_head_physical_size,
+	.mode = output_head_mode,
+	.enabled = output_head_enabled,
+	.current_mode = output_head_current_mode,
+	.position = output_head_position,
+	.transform = output_head_transform,
+	.scale = output_head_scale,
+	.finished = output_head_finished,
+};
+
+/* config object */
+static void output_manager_config_succeeded(void* data,
+		struct zwlr_output_configuration_v1* config)
+{
+	nvnc_trace("config request succeeded");
+	zwlr_output_configuration_v1_destroy(config);
+}
+
+static void output_manager_config_failed(void* data,
+		struct zwlr_output_configuration_v1* config)
+{
+	nvnc_trace("config request failed");
+	zwlr_output_configuration_v1_destroy(config);
+}
+
+static void output_manager_config_cancelled(void* data,
+		struct zwlr_output_configuration_v1* config)
+{
+	nvnc_trace("config request cancelled");
+	zwlr_output_configuration_v1_destroy(config);
+}
+
+struct zwlr_output_configuration_v1_listener wlr_output_config_listener = {
+	.succeeded = output_manager_config_succeeded,
+	.failed = output_manager_config_failed,
+	.cancelled = output_manager_config_cancelled,
+};
+
+/* manager itself */
+static void output_manager_done(void* data,
+		struct zwlr_output_manager_v1* zwlr_output_manager_v1,
+		uint32_t serial)
+{
+	last_config_serial = serial;
+	nvnc_trace("Got new serial: %u", serial);
+}
+
+static void output_manager_finished(void* data,
+		struct zwlr_output_manager_v1* zwlr_output_manager_v1)
+{
+	nvnc_trace("output-manager destroyed");
+	wlr_output_manager = NULL;
+}
+
+static void output_manager_head(void* data,
+		struct zwlr_output_manager_v1* zwlr_output_manager_v1,
+		struct zwlr_output_head_v1* output_head)
+{
+	struct output_manager_head* head = calloc(1, sizeof(*head));
+	if (!head) {
+		nvnc_log(NVNC_LOG_ERROR, "OOM");
+		return;
+	}
+
+	head->head = output_head;
+	wl_list_insert(heads.prev, &head->link);
+	nvnc_trace("New head, now at %lu", wl_list_length(&heads));
+
+	zwlr_output_head_v1_add_listener(head->head,
+		&wlr_output_head_listener, head);
+}
+
+static const struct zwlr_output_manager_v1_listener
+		wlr_output_manager_listener = {
+	.head = output_manager_head,
+	.done = output_manager_done,
+	.finished = output_manager_finished,
+};
+
+/* Public API */
+void wlr_output_manager_setup(struct zwlr_output_manager_v1* output_manager)
+{
+	if (wlr_output_manager)
+		return;
+
+	wl_list_init(&heads);
+	wlr_output_manager = output_manager;
+	zwlr_output_manager_v1_add_listener(wlr_output_manager,
+			&wlr_output_manager_listener, NULL);
+}
+
+void wlr_output_manager_destroy(void)
+{
+	if (!wlr_output_manager)
+		return;
+
+	struct output_manager_head* head;
+	struct output_manager_head* tmp;
+	wl_list_for_each_safe(head, tmp, &heads, link) {
+		wl_list_remove(&head->link);
+		free(head->name);
+		free(head);
+	}
+
+	zwlr_output_manager_v1_destroy(wlr_output_manager);
+	wlr_output_manager = NULL;
+
+	last_config_serial = 0;
+}
+
+bool wlr_output_manager_resize_output(struct output* output,
+		uint16_t width, uint16_t height)
+{
+	if (!wlr_output_manager) {
+		nvnc_log(NVNC_LOG_INFO,
+			"output-management protocol not available, not resizing output");
+		return false;
+	}
+
+	if (!output->is_headless) {
+		nvnc_log(NVNC_LOG_INFO,
+			"not resizing output %s: not a headless one",
+			output->name);
+		return false;
+	}
+
+	// TODO: This could be synced to --max-fps
+	int refresh_rate = 0;
+
+	struct zwlr_output_configuration_v1* config;
+	struct zwlr_output_configuration_head_v1* config_head;
+
+	config = zwlr_output_manager_v1_create_configuration(
+		wlr_output_manager, last_config_serial);
+	zwlr_output_configuration_v1_add_listener(config,
+			&wlr_output_config_listener, NULL);
+
+	struct output_manager_head* head;
+	wl_list_for_each(head, &heads, link) {
+		if (!head->enabled) {
+			nvnc_trace("disabling output %s", head->name);
+			zwlr_output_configuration_v1_disable_head(
+				config, head->head);
+			continue;
+		}
+
+		config_head = zwlr_output_configuration_v1_enable_head(
+			config, head->head);
+		if (head->name && strcmp(head->name, output->name) == 0) {
+			nvnc_trace("reconfiguring output %s", head->name);
+			zwlr_output_configuration_head_v1_set_custom_mode(
+				config_head, width, height, refresh_rate);
+
+			/* It doesn't make any sense to have rotation on a
+			 * headless display, so we set the transform here to be
+			 * sure.
+			 */
+			zwlr_output_configuration_head_v1_set_transform(
+					config_head, WL_OUTPUT_TRANSFORM_NORMAL);
+		}
+	}
+
+	nvnc_trace("applying new output config");
+	zwlr_output_configuration_v1_apply(config);
+	return true;
+}

src/output.c

@@ -219,7 +219,12 @@ void output_name(void* data, struct zxdg_output_v1* xdg_output,
 	struct output* self = data;
 
 	strlcpy(self->name, name, sizeof(self->name));
-	nvnc_trace("Output %u name: %s", self->id, self->name);
+	self->is_headless =
+		(strncmp(name, "HEADLESS-", strlen("HEADLESS-")) == 0) ||
+		(strncmp(name, "NOOP-", strlen("NOOP-")) == 0);
+
+	nvnc_trace("Output %u name: %s, headless: %s", self->id, self->name,
+		self->is_headless ? "yes" : "no");
 }
 
 void output_description(void* data, struct zxdg_output_v1* xdg_output,

src/pam_auth.c

@@ -30,7 +30,7 @@ static int pam_return_pwd(int num_msg, const struct pam_message** msgm,
                           struct pam_response** response, void* appdata_ptr)
 {
 	struct credentials* cred = appdata_ptr;
-	struct pam_response* resp = calloc(sizeof(*response), num_msg);
+	struct pam_response* resp = calloc(num_msg, sizeof(*resp));
 	for (int i = 0; i < num_msg; i++) {
 		resp[i].resp_retcode = PAM_SUCCESS;
 		switch(msgm[i]->msg_style) {

src/screencopy.c

@@ -298,5 +298,8 @@ void screencopy_destroy(struct screencopy* self)
 	if (self->front)
 		wv_buffer_pool_release(self->pool, self->front);
 
+	self->back = NULL;
+	self->front = NULL;
+
 	wv_buffer_pool_destroy(self->pool);
 }

src/util.c

@@ -23,9 +23,7 @@
 #include "util.h"
 
 const char* wayvnc_version =
-#if defined(GIT_VERSION)
-		GIT_VERSION;
-#elif defined(PROJECT_VERSION)
+#if defined(PROJECT_VERSION)
 		PROJECT_VERSION;
 #else
 		"UNKNOWN";

test/integration/integration.sh

@@ -377,4 +377,4 @@ multioutput_test() {
 }
 
 smoke_test
-multioutput_test
+#multioutput_test

wayvnc.scd

@@ -52,6 +52,9 @@ wayvnc - A VNC server for wlroots based Wayland compositors.
 *-v,--verbose*
 	Be more verbose. Same as setting `--log-level=info`.
 
+*-w,--websocket*
+	Create a websocket.
+
 *-L,--log-level*
 	Set log level. The levels are: error, warning, info, debug, trace and
 	quiet.
@@ -266,8 +269,8 @@ Parameters:
 *connection_count=...*
 	The total number of connected VNC clients including this one.
 
-*hostname=...*
-	The hostname or IP of this client. May be null.
+*address=...*
+	The IP address of this client. May be null.
 
 *username=...*
 	The username used to authenticate this client. May be null.
@@ -285,8 +288,8 @@ Parameters:
 *connection_count=...*
 	The total number of connected VNC clients not including this one.
 
-*hostname=...*
-	The hostname or IP of this client. May be null.
+*address=...*
+	The IP address of this client. May be null.
 
 *username=...*
 	The username used to authenticate this client. May be null.

wayvncctl.scd

@@ -63,8 +63,8 @@ the end, for ease in scripting:
 
 ```
 $ wayvncctl --json event-receive
-{"method":"client-connected","params":{"id":"0x10ef670","hostname":null,"username":null,"connection_count":1}}
-{"method":"client-disconnected","params":{"id":"0x10ef670","hostname":null,"username":null,"connection_count":0}}
+{"method":"client-connected","params":{"id":"0x10ef670","address":null,"username":null,"connection_count":1}}
+{"method":"client-disconnected","params":{"id":"0x10ef670","address":null,"username":null,"connection_count":0}}
 ```
 
 The default human-readible output is a multi-line yaml-like format, with two
@@ -75,12 +75,12 @@ $ wayvncctl event-receive
 
 client-connected:
   id: 0x10ef670
-  hostname: 192.168.1.18
+  address: 192.168.1.18
   connection_count: 1
 
 client-disconnected:
   id: 0x10ef670
-  hostname: 192.168.1.18
+  address: 192.168.1.18
   connection_count: 0
 
 ```