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/*
* Remmina - The GTK Remote Desktop Client
* Copyright (C) 2010 Vic Lee
* Copyright (C) 2014-2015 Antenore Gatta, Fabio Castelli, Giovanni Panozzo
* Copyright (C) 2016-2020 Antenore Gatta, Giovanni Panozzo
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. * If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. * If you
* do not wish to do so, delete this exception statement from your
* version. * If you delete this exception statement from all source
* files in the program, then also delete it here.
*
*/
#include "common/remmina_plugin.h"
#include <gtk/gtkx.h>
INCLUDE_GET_AVAILABLE_XDISPLAY
#define REMMINA_PLUGIN_XDMCP_FEATURE_TOOL_SENDCTRLALTDEL 1
#define REMMINA_PLUGIN_XDMCP_FEATURE_GTKSOCKET 1
#define GET_PLUGIN_DATA(gp) (RemminaPluginXdmcpData*)g_object_get_data(G_OBJECT(gp), "plugin-data");
/* Forward declaration */
static RemminaProtocolPlugin remmina_plugin_xdmcp;
typedef struct _RemminaPluginXdmcpData {
GtkWidget *socket;
gint socket_id;
GPid pid;
gint output_fd;
gint error_fd;
gint display;
gboolean ready;
pthread_t thread;
} RemminaPluginXdmcpData;
static RemminaPluginService *remmina_plugin_service = NULL;
static void remmina_plugin_xdmcp_on_plug_added(GtkSocket *socket, RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
RemminaPluginXdmcpData *gpdata = GET_PLUGIN_DATA(gp);
remmina_plugin_service->protocol_plugin_signal_connection_opened(gp);
gpdata->ready = TRUE;
}
static void remmina_plugin_xdmcp_on_plug_removed(GtkSocket *socket, RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
remmina_plugin_service->protocol_plugin_signal_connection_closed(gp);
}
static gboolean remmina_plugin_xdmcp_start_xephyr(RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
RemminaPluginXdmcpData *gpdata = GET_PLUGIN_DATA(gp);
RemminaFile *remminafile;
gchar *argv[50];
gint argc;
gchar *host;
gint i;
GError *error = NULL;
gboolean ret;
remminafile = remmina_plugin_service->protocol_plugin_get_file(gp);
gpdata->display = remmina_get_available_xdisplay();
if (gpdata->display == 0) {
remmina_plugin_service->protocol_plugin_set_error(gp, _("Run out of available local X display number."));
return FALSE;
}
argc = 0;
argv[argc++] = g_strdup("Xephyr");
argv[argc++] = g_strdup_printf(":%i", gpdata->display);
argv[argc++] = g_strdup("-parent");
argv[argc++] = g_strdup_printf("%i", gpdata->socket_id);
/* All Xephyr version between 1.5.0 and 1.6.4 will break when "-screen" argument is specified with "-parent".
* It’s not possible to support colour depth if you have those Xephyr version. Please see this bug
* http://bugs.freedesktop.org/show_bug.cgi?id=24144
* As a workaround, a "Default" colour depth will not add the "-screen" argument.
*/
i = remmina_plugin_service->file_get_int(remminafile, "colordepth", 8);
if (i >= 8) {
argv[argc++] = g_strdup("-screen");
argv[argc++] = g_strdup_printf("%ix%ix%i",
remmina_plugin_service->get_profile_remote_width(gp),
remmina_plugin_service->get_profile_remote_height(gp), i);
}
if (i == 2) {
argv[argc++] = g_strdup("-grayscale");
}
if (remmina_plugin_service->file_get_int(remminafile, "showcursor", FALSE)) {
argv[argc++] = g_strdup("-host-cursor");
}
if (remmina_plugin_service->file_get_int(remminafile, "once", FALSE)) {
argv[argc++] = g_strdup("-once");
}
/* Listen on TCP protocol */
if (remmina_plugin_service->file_get_int(remminafile, "listen_on_tcp", FALSE)) {
argv[argc++] = g_strdup("-listen");
argv[argc++] = g_strdup("tcp");
}
if (!remmina_plugin_service->file_get_int(remminafile, "ssh_enabled", FALSE)) {
remmina_plugin_service->get_server_port(remmina_plugin_service->file_get_string(remminafile, "server"), 0,
&host, &i);
argv[argc++] = g_strdup("-query");
argv[argc++] = host;
if (i) {
argv[argc++] = g_strdup("-port");
argv[argc++] = g_strdup_printf("%i", i);
}
}else {
/* When the connection is through an SSH tunnel, it connects back to local Unix socket,
* so for security we can disable TCP listening */
argv[argc++] = g_strdup("-nolisten");
argv[argc++] = g_strdup("tcp");
/* FIXME: It’s better to get the magic cookie back from xqproxy, then call xauth,
* instead of disable access control */
argv[argc++] = g_strdup("-ac");
}
argv[argc++] = NULL;
ret = g_spawn_async(NULL, argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, &gpdata->pid, &error);
for (i = 0; i < argc; i++)
g_free(argv[i]);
if (!ret) {
remmina_plugin_service->protocol_plugin_set_error(gp, "%s", error->message);
return FALSE;
}
return TRUE;
}
static gboolean remmina_plugin_xdmcp_tunnel_init_callback(RemminaProtocolWidget *gp, gint remotedisplay, const gchar *server,
gint port)
{
TRACE_CALL(__func__);
RemminaPluginXdmcpData *gpdata = GET_PLUGIN_DATA(gp);
RemminaFile *remminafile;
remminafile = remmina_plugin_service->protocol_plugin_get_file(gp);
if (!remmina_plugin_xdmcp_start_xephyr(gp))
return FALSE;
while (!gpdata->ready)
sleep(1);
remmina_plugin_service->protocol_plugin_set_display(gp, gpdata->display);
if (remmina_plugin_service->file_get_string(remminafile, "exec")) {
return remmina_plugin_service->protocol_plugin_ssh_exec(gp, FALSE, "DISPLAY=localhost:%i.0 %s", remotedisplay,
remmina_plugin_service->file_get_string(remminafile, "exec"));
}else {
return remmina_plugin_service->protocol_plugin_ssh_exec(gp, TRUE,
"xqproxy -display %i -host %s -port %i -query -manage", remotedisplay, server, port);
}
}
static gboolean remmina_plugin_xdmcp_main(RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
RemminaPluginXdmcpData *gpdata = GET_PLUGIN_DATA(gp);
RemminaFile *remminafile;
remminafile = remmina_plugin_service->protocol_plugin_get_file(gp);
if (remmina_plugin_service->file_get_int(remminafile, "ssh_enabled", FALSE)) {
if (!remmina_plugin_service->protocol_plugin_start_xport_tunnel(gp, remmina_plugin_xdmcp_tunnel_init_callback)) {
gpdata->thread = 0;
return FALSE;
}
}else {
if (!remmina_plugin_xdmcp_start_xephyr(gp)) {
gpdata->thread = 0;
return FALSE;
}
}
gpdata->thread = 0;
return TRUE;
}
static gpointer
remmina_plugin_xdmcp_main_thread(gpointer data)
{
TRACE_CALL(__func__);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
CANCEL_ASYNC
if (!remmina_plugin_xdmcp_main((RemminaProtocolWidget*)data)) {
IDLE_ADD((GSourceFunc)remmina_plugin_service->protocol_plugin_signal_connection_closed, data);
}
return NULL;
}
static void remmina_plugin_xdmcp_init(RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
RemminaPluginXdmcpData *gpdata;
gpdata = g_new0(RemminaPluginXdmcpData, 1);
g_object_set_data_full(G_OBJECT(gp), "plugin-data", gpdata, g_free);
gpdata->socket = gtk_socket_new();
remmina_plugin_service->protocol_plugin_register_hostkey(gp, gpdata->socket);
gtk_widget_show(gpdata->socket);
g_signal_connect(G_OBJECT(gpdata->socket), "plug-added", G_CALLBACK(remmina_plugin_xdmcp_on_plug_added), gp);
g_signal_connect(G_OBJECT(gpdata->socket), "plug-removed", G_CALLBACK(remmina_plugin_xdmcp_on_plug_removed), gp);
gtk_container_add(GTK_CONTAINER(gp), gpdata->socket);
}
static gboolean remmina_plugin_xdmcp_open_connection(RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
RemminaPluginXdmcpData *gpdata = GET_PLUGIN_DATA(gp);
RemminaFile *remminafile;
gint width, height;
if (!remmina_plugin_service->gtksocket_available()) {
remmina_plugin_service->protocol_plugin_set_error(gp,
_("The protocol \"%s\" is unavailable because GtkSocket only works under X.Org."),
remmina_plugin_xdmcp.name);
return FALSE;
}
remminafile = remmina_plugin_service->protocol_plugin_get_file(gp);
width = remmina_plugin_service->get_profile_remote_width(gp);
height = remmina_plugin_service->get_profile_remote_height(gp);
remmina_plugin_service->protocol_plugin_set_width(gp, width);
remmina_plugin_service->protocol_plugin_set_height(gp, height);
gtk_widget_set_size_request(GTK_WIDGET(gp), width, height);
gpdata->socket_id = gtk_socket_get_id(GTK_SOCKET(gpdata->socket));
if (remmina_plugin_service->file_get_int(remminafile, "ssh_enabled", FALSE)) {
if (pthread_create(&gpdata->thread, NULL, remmina_plugin_xdmcp_main_thread, gp)) {
remmina_plugin_service->protocol_plugin_set_error(gp,
"Failed to initialize pthread. Falling back to non-thread mode…");
gpdata->thread = 0;
return FALSE;
}else {
return TRUE;
}
}else {
return remmina_plugin_xdmcp_main(gp);
}
}
static gboolean remmina_plugin_xdmcp_close_connection(RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
RemminaPluginXdmcpData *gpdata = GET_PLUGIN_DATA(gp);
if (gpdata->thread) {
pthread_cancel(gpdata->thread);
if (gpdata->thread) pthread_join(gpdata->thread, NULL);
}
if (gpdata->pid) {
kill(gpdata->pid, SIGTERM);
g_spawn_close_pid(gpdata->pid);
gpdata->pid = 0;
}
remmina_plugin_service->protocol_plugin_signal_connection_closed(gp);
return FALSE;
}
/* Send Ctrl+Alt+Del keys keystrokes to the plugin socket widget */
static void remmina_plugin_xdmcp_send_ctrlaltdel(RemminaProtocolWidget *gp)
{
TRACE_CALL(__func__);
guint keys[] = { GDK_KEY_Control_L, GDK_KEY_Alt_L, GDK_KEY_Delete };
RemminaPluginXdmcpData *gpdata = GET_PLUGIN_DATA(gp);
remmina_plugin_service->protocol_plugin_send_keys_signals(gpdata->socket,
keys, G_N_ELEMENTS(keys), GDK_KEY_PRESS | GDK_KEY_RELEASE);
}
static gboolean remmina_plugin_xdmcp_query_feature(RemminaProtocolWidget *gp, const RemminaProtocolFeature *feature)
{
TRACE_CALL(__func__);
return TRUE;
}
static void remmina_plugin_xdmcp_call_feature(RemminaProtocolWidget *gp, const RemminaProtocolFeature *feature)
{
TRACE_CALL(__func__);
switch (feature->id) {
case REMMINA_PLUGIN_XDMCP_FEATURE_TOOL_SENDCTRLALTDEL:
remmina_plugin_xdmcp_send_ctrlaltdel(gp);
break;
default:
break;
}
}
/* Array of key/value pairs for colour depths */
static gpointer colordepth_list[] =
{
"0", N_("Default"),
"2", N_("Grayscale"),
"8", N_("256 colours"),
"16", N_("High colour (16 bit)"),
"24", N_("True colour (24 bit)"),
NULL
};
/* Array of RemminaProtocolSetting for basic settings.
* Each item is composed by:
* a) RemminaProtocolSettingType for setting type
* b) Setting name
* c) Setting description
* d) Compact disposition
* e) Values for REMMINA_PROTOCOL_SETTING_TYPE_SELECT or REMMINA_PROTOCOL_SETTING_TYPE_COMBO
* f) Setting tooltip
*/
static const RemminaProtocolSetting remmina_plugin_xdmcp_basic_settings[] =
{
{ REMMINA_PROTOCOL_SETTING_TYPE_SERVER, "server", NULL, FALSE, NULL, NULL },
{ REMMINA_PROTOCOL_SETTING_TYPE_RESOLUTION, "resolution", NULL, FALSE, NULL, NULL },
{ REMMINA_PROTOCOL_SETTING_TYPE_SELECT, "colordepth", N_("Colour depth"), FALSE, colordepth_list, NULL },
{ REMMINA_PROTOCOL_SETTING_TYPE_TEXT, "exec", N_("Startup program"), FALSE, NULL, NULL },
{ REMMINA_PROTOCOL_SETTING_TYPE_CHECK, "showcursor", N_("Use local cursor"), FALSE, NULL, NULL },
{ REMMINA_PROTOCOL_SETTING_TYPE_CHECK, "once", N_("Disconnect after first session"), FALSE, NULL, NULL },
{ REMMINA_PROTOCOL_SETTING_TYPE_CHECK, "listen_on_tcp", N_("Listen for TCP connections"), FALSE, NULL, NULL },
{ REMMINA_PROTOCOL_SETTING_TYPE_END, NULL, NULL, FALSE, NULL, NULL }
};
/* Array for available features.
* The last element of the array must be REMMINA_PROTOCOL_FEATURE_TYPE_END. */
static const RemminaProtocolFeature remmina_plugin_xdmcp_features[] =
{
{ REMMINA_PROTOCOL_FEATURE_TYPE_TOOL, REMMINA_PLUGIN_XDMCP_FEATURE_TOOL_SENDCTRLALTDEL, N_("Send Ctrl+Alt+Delete"), NULL, NULL },
{ REMMINA_PROTOCOL_FEATURE_TYPE_GTKSOCKET, REMMINA_PLUGIN_XDMCP_FEATURE_GTKSOCKET, NULL, NULL, NULL},
{ REMMINA_PROTOCOL_FEATURE_TYPE_END, 0, NULL, NULL, NULL }
};
/* Protocol plugin definition and features */
static RemminaProtocolPlugin remmina_plugin_xdmcp =
{
REMMINA_PLUGIN_TYPE_PROTOCOL, // Type
"XDMCP", // Name
N_("XDMCP - X Remote Session"), // Description
GETTEXT_PACKAGE, // Translation domain
VERSION, // Version number
"remmina-xdmcp-symbolic", // Icon for normal connection
"remmina-xdmcp-ssh-symbolic", // Icon for SSH connection
remmina_plugin_xdmcp_basic_settings, // Array for basic settings
NULL, // Array for advanced settings
REMMINA_PROTOCOL_SSH_SETTING_TUNNEL, // SSH settings type
remmina_plugin_xdmcp_features, // Array for available features
remmina_plugin_xdmcp_init, // Plugin initialization
remmina_plugin_xdmcp_open_connection, // Plugin open connection
remmina_plugin_xdmcp_close_connection, // Plugin close connection
remmina_plugin_xdmcp_query_feature, // Query for available features
remmina_plugin_xdmcp_call_feature, // Call a feature
NULL, // Send a keystroke
NULL // No screenshot support available
};
G_MODULE_EXPORT gboolean
remmina_plugin_entry(RemminaPluginService *service)
{
TRACE_CALL(__func__);
remmina_plugin_service = service;
bindtextdomain(GETTEXT_PACKAGE, REMMINA_RUNTIME_LOCALEDIR);
bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");
if (!service->register_plugin((RemminaPlugin*)&remmina_plugin_xdmcp)) {
return FALSE;
}
return TRUE;
}
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