src/vdagentd.c

   1 /*  vdagentd.c vdagentd (daemon) code
   2
   3     Copyright 2010-2013 Red Hat, Inc.
   4
   5     Red Hat Authors:
   6     Hans de Goede <hdegoede@redhat.com>
   7     Gerd Hoffmann <kraxel@redhat.com>
   8
   9     This program is free software: you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation, either version 3 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32 #include <signal.h>
  33 #include <syslog.h>
  34 #include <sys/select.h>
  35 #include <sys/stat.h>
  36 #include <spice/vd_agent.h>
  37 #include <glib.h>
  38
  39 #include "udscs.h"
  40 #include "vdagentd-proto.h"
  41 #include "vdagentd-proto-strings.h"
  42 #include "vdagentd-uinput.h"
  43 #include "vdagentd-xorg-conf.h"
  44 #include "vdagent-virtio-port.h"
  45 #include "session-info.h"
  46
  47 struct agent_data {
  48     char *session;
  49     int width;
  50     int height;
  51     struct vdagentd_guest_xorg_resolution *screen_info;
  52     int screen_count;
  53 };
  54
  55 /* variables */
  56 static const char *pidfilename = "/var/run/spice-vdagentd/spice-vdagentd.pid";
  57 static const char *portdev = "/dev/virtio-ports/com.redhat.spice.0";
  58 static const char *vdagentd_socket = VDAGENTD_SOCKET;
  59 static const char *uinput_device = "/dev/uinput";
  60 static int debug = 0;
  61 static int uinput_fake = 0;
  62 static int only_once = 0;
  63 static struct udscs_server *server = NULL;
  64 static struct vdagent_virtio_port *virtio_port = NULL;
  65 static GHashTable *active_xfers = NULL;
  66 static struct session_info *session_info = NULL;
  67 static struct vdagentd_uinput *uinput = NULL;
  68 static VDAgentMonitorsConfig *mon_config = NULL;
  69 static uint32_t *capabilities = NULL;
  70 static int capabilities_size = 0;
  71 static const char *active_session = NULL;
  72 static unsigned int session_count = 0;
  73 static struct udscs_connection *active_session_conn = NULL;
  74 static int agent_owns_clipboard[256] = { 0, };
  75 static int quit = 0;
  76 static int retval = 0;
  77 static int client_connected = 0;
  78 static int max_clipboard = -1;
  79
  80 /* utility functions */
  81 /* vdagentd <-> spice-client communication handling */
  82 static void send_capabilities(struct vdagent_virtio_port *vport,
  83     uint32_t request)
  84 {
  85     VDAgentAnnounceCapabilities *caps;
  86     uint32_t size;
  87
  88     size = sizeof(*caps) + VD_AGENT_CAPS_BYTES;
  89     caps = calloc(1, size);
  90     if (!caps) {
  91         syslog(LOG_ERR, "out of memory allocating capabilities array (write)");
  92         return;
  93     }
  94
  95     caps->request = request;
  96     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_MOUSE_STATE);
  97     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_MONITORS_CONFIG);
  98     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_REPLY);
  99     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_CLIPBOARD_BY_DEMAND);
 100     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_CLIPBOARD_SELECTION);
 101     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_SPARSE_MONITORS_CONFIG);
 102     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_GUEST_LINEEND_LF);
 103     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_MAX_CLIPBOARD);
 104     VD_AGENT_SET_CAPABILITY(caps->caps, VD_AGENT_CAP_AUDIO_VOLUME_SYNC);
 105
 106     vdagent_virtio_port_write(vport, VDP_CLIENT_PORT,
 107                               VD_AGENT_ANNOUNCE_CAPABILITIES, 0,
 108                               (uint8_t *)caps, size);
 109     free(caps);
 110 }
 111
 112 static void do_client_disconnect(void)
 113 {
 114     if (client_connected) {
 115         udscs_server_write_all(server, VDAGENTD_CLIENT_DISCONNECTED, 0, 0,
 116                                NULL, 0);
 117         client_connected = 0;
 118     }
 119 }
 120
 121 static void do_client_monitors(struct vdagent_virtio_port *vport, int port_nr,
 122     VDAgentMessage *message_header, VDAgentMonitorsConfig *new_monitors)
 123 {
 124     VDAgentReply reply;
 125     uint32_t size;
 126
 127     /* Store monitor config to send to agents when they connect */
 128     size = sizeof(VDAgentMonitorsConfig) +
 129            new_monitors->num_of_monitors * sizeof(VDAgentMonConfig);
 130     if (message_header->size != size) {
 131         syslog(LOG_ERR, "invalid message size for VDAgentMonitorsConfig");
 132         return;
 133     }
 134
 135     vdagentd_write_xorg_conf(new_monitors);
 136
 137     if (!mon_config ||
 138             mon_config->num_of_monitors != new_monitors->num_of_monitors) {
 139         free(mon_config);
 140         mon_config = malloc(size);
 141         if (!mon_config) {
 142             syslog(LOG_ERR, "out of memory allocating monitors config");
 143             return;
 144         }
 145     }
 146     memcpy(mon_config, new_monitors, size);
 147
 148     /* Send monitor config to currently active agent */
 149     if (active_session_conn)
 150         udscs_write(active_session_conn, VDAGENTD_MONITORS_CONFIG, 0, 0,
 151                     (uint8_t *)mon_config, size);
 152
 153     /* Acknowledge reception of monitors config to spice server / client */
 154     reply.type  = VD_AGENT_MONITORS_CONFIG;
 155     reply.error = VD_AGENT_SUCCESS;
 156     vdagent_virtio_port_write(vport, port_nr, VD_AGENT_REPLY, 0,
 157                               (uint8_t *)&reply, sizeof(reply));
 158 }
 159
 160 static void do_client_volume_sync(struct vdagent_virtio_port *vport, int port_nr,
 161     VDAgentMessage *message_header,
 162     VDAgentAudioVolumeSync *avs)
 163 {
 164     if (active_session_conn == NULL) {
 165         syslog(LOG_DEBUG, "No active session - Can't volume-sync");
 166         return;
 167     }
 168
 169     udscs_write(active_session_conn, VDAGENTD_AUDIO_VOLUME_SYNC, 0, 0,
 170                 (uint8_t *)avs, message_header->size);
 171 }
 172
 173 static void do_client_capabilities(struct vdagent_virtio_port *vport,
 174     VDAgentMessage *message_header,
 175     VDAgentAnnounceCapabilities *caps)
 176 {
 177     int new_size = VD_AGENT_CAPS_SIZE_FROM_MSG_SIZE(message_header->size);
 178
 179     if (capabilities_size != new_size) {
 180         capabilities_size = new_size;
 181         free(capabilities);
 182         capabilities = malloc(capabilities_size * sizeof(uint32_t));
 183         if (!capabilities) {
 184             syslog(LOG_ERR, "oom allocating capabilities array (read)");
 185             capabilities_size = 0;
 186             return;
 187         }
 188     }
 189     memcpy(capabilities, caps->caps, capabilities_size * sizeof(uint32_t));
 190     if (caps->request) {
 191         /* Report the previous client has disconneced. */
 192         do_client_disconnect();
 193         if (debug)
 194             syslog(LOG_DEBUG, "New client connected");
 195         client_connected = 1;
 196         send_capabilities(vport, 0);
 197     }
 198 }
 199
 200 static void do_client_clipboard(struct vdagent_virtio_port *vport,
 201     VDAgentMessage *message_header, uint8_t *data)
 202 {
 203     uint32_t msg_type = 0, data_type = 0, size = message_header->size;
 204     uint8_t selection = VD_AGENT_CLIPBOARD_SELECTION_CLIPBOARD;
 205
 206     if (!active_session_conn) {
 207         syslog(LOG_WARNING,
 208                "Could not find an agent connection belonging to the "
 209                "active session, ignoring client clipboard request");
 210         return;
 211     }
 212
 213     if (VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
 214                                 VD_AGENT_CAP_CLIPBOARD_SELECTION)) {
 215       selection = data[0];
 216       data += 4;
 217       size -= 4;
 218     }
 219
 220     switch (message_header->type) {
 221     case VD_AGENT_CLIPBOARD_GRAB:
 222         msg_type = VDAGENTD_CLIPBOARD_GRAB;
 223         agent_owns_clipboard[selection] = 0;
 224         break;
 225     case VD_AGENT_CLIPBOARD_REQUEST: {
 226         VDAgentClipboardRequest *req = (VDAgentClipboardRequest *)data;
 227         msg_type = VDAGENTD_CLIPBOARD_REQUEST;
 228         data_type = req->type;
 229         data = NULL;
 230         size = 0;
 231         break;
 232     }
 233     case VD_AGENT_CLIPBOARD: {
 234         VDAgentClipboard *clipboard = (VDAgentClipboard *)data;
 235         msg_type = VDAGENTD_CLIPBOARD_DATA;
 236         data_type = clipboard->type;
 237         size = size - sizeof(VDAgentClipboard);
 238         data = clipboard->data;
 239         break;
 240     }
 241     case VD_AGENT_CLIPBOARD_RELEASE:
 242         msg_type = VDAGENTD_CLIPBOARD_RELEASE;
 243         data = NULL;
 244         size = 0;
 245         break;
 246     }
 247
 248     udscs_write(active_session_conn, msg_type, selection, data_type,
 249                 data, size);
 250 }
 251
 252 /* To be used by vdagentd for failures in file-xfer such as when file-xfer was
 253  * cancelled or an error happened */
 254 static void send_file_xfer_status(struct vdagent_virtio_port *vport,
 255                                   const char *msg, uint32_t id, uint32_t xfer_status)
 256 {
 257     VDAgentFileXferStatusMessage status = {
 258         .id = id,
 259         .result = xfer_status,
 260     };
 261     syslog(LOG_WARNING, msg, id);
 262     if (vport)
 263         vdagent_virtio_port_write(vport, VDP_CLIENT_PORT,
 264                                   VD_AGENT_FILE_XFER_STATUS, 0,
 265                                   (uint8_t *)&status, sizeof(status));
 266 }
 267
 268 static void do_client_file_xfer(struct vdagent_virtio_port *vport,
 269                                 VDAgentMessage *message_header,
 270                                 uint8_t *data)
 271 {
 272     uint32_t msg_type, id;
 273     struct udscs_connection *conn;
 274
 275     switch (message_header->type) {
 276     case VD_AGENT_FILE_XFER_START: {
 277         VDAgentFileXferStartMessage *s = (VDAgentFileXferStartMessage *)data;
 278         if (!active_session_conn) {
 279             send_file_xfer_status(vport,
 280                "Could not find an agent connnection belonging to the "
 281                "active session, cancelling client file-xfer request %u",
 282                s->id, VD_AGENT_FILE_XFER_STATUS_CANCELLED);
 283             return;
 284         } else if (session_info_session_is_locked(session_info)) {
 285             syslog(LOG_DEBUG, "Session is locked, skipping file-xfer-start");
 286             send_file_xfer_status(vport,
 287                "User's session is locked and cannot start file transfer. "
 288                "Cancelling client file-xfer request %u",
 289                s->id, VD_AGENT_FILE_XFER_STATUS_ERROR);
 290             return;
 291         }
 292         udscs_write(active_session_conn, VDAGENTD_FILE_XFER_START, 0, 0,
 293                     data, message_header->size);
 294         return;
 295     }
 296     case VD_AGENT_FILE_XFER_STATUS: {
 297         VDAgentFileXferStatusMessage *s = (VDAgentFileXferStatusMessage *)data;
 298         msg_type = VDAGENTD_FILE_XFER_STATUS;
 299         id = s->id;
 300         break;
 301     }
 302     case VD_AGENT_FILE_XFER_DATA: {
 303         VDAgentFileXferDataMessage *d = (VDAgentFileXferDataMessage *)data;
 304         msg_type = VDAGENTD_FILE_XFER_DATA;
 305         id = d->id;
 306         break;
 307     }
 308     }
 309
 310     conn = g_hash_table_lookup(active_xfers, GUINT_TO_POINTER(id));
 311     if (!conn) {
 312         if (debug)
 313             syslog(LOG_DEBUG, "Could not find file-xfer %u (cancelled?)", id);
 314         return;
 315     }
 316     udscs_write(conn, msg_type, 0, 0, data, message_header->size);
 317 }
 318
 319 static int virtio_port_read_complete(
 320         struct vdagent_virtio_port *vport,
 321         int port_nr,
 322         VDAgentMessage *message_header,
 323         uint8_t *data)
 324 {
 325     uint32_t min_size = 0;
 326
 327     if (message_header->protocol != VD_AGENT_PROTOCOL) {
 328         syslog(LOG_ERR, "message with wrong protocol version ignoring");
 329         return 0;
 330     }
 331
 332     switch (message_header->type) {
 333     case VD_AGENT_MOUSE_STATE:
 334         if (message_header->size != sizeof(VDAgentMouseState))
 335             goto size_error;
 336         vdagentd_uinput_do_mouse(&uinput, (VDAgentMouseState *)data);
 337         if (!uinput) {
 338             /* Try to re-open the tablet */
 339             struct agent_data *agent_data =
 340                 udscs_get_user_data(active_session_conn);
 341             if (agent_data)
 342                 uinput = vdagentd_uinput_create(uinput_device,
 343                                                 agent_data->width,
 344                                                 agent_data->height,
 345                                                 agent_data->screen_info,
 346                                                 agent_data->screen_count,
 347                                                 debug > 1,
 348                                                 uinput_fake);
 349             if (!uinput) {
 350                 syslog(LOG_CRIT, "Fatal uinput error");
 351                 retval = 1;
 352                 quit = 1;
 353             }
 354         }
 355         break;
 356     case VD_AGENT_MONITORS_CONFIG:
 357         if (message_header->size < sizeof(VDAgentMonitorsConfig))
 358             goto size_error;
 359         do_client_monitors(vport, port_nr, message_header,
 360                     (VDAgentMonitorsConfig *)data);
 361         break;
 362     case VD_AGENT_ANNOUNCE_CAPABILITIES:
 363         if (message_header->size < sizeof(VDAgentAnnounceCapabilities))
 364             goto size_error;
 365         do_client_capabilities(vport, message_header,
 366                         (VDAgentAnnounceCapabilities *)data);
 367         break;
 368     case VD_AGENT_CLIPBOARD_GRAB:
 369     case VD_AGENT_CLIPBOARD_REQUEST:
 370     case VD_AGENT_CLIPBOARD:
 371     case VD_AGENT_CLIPBOARD_RELEASE:
 372         switch (message_header->type) {
 373         case VD_AGENT_CLIPBOARD_GRAB:
 374             min_size = sizeof(VDAgentClipboardGrab); break;
 375         case VD_AGENT_CLIPBOARD_REQUEST:
 376             min_size = sizeof(VDAgentClipboardRequest); break;
 377         case VD_AGENT_CLIPBOARD:
 378             min_size = sizeof(VDAgentClipboard); break;
 379         }
 380         if (VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
 381                                     VD_AGENT_CAP_CLIPBOARD_SELECTION)) {
 382             min_size += 4;
 383         }
 384         if (message_header->size < min_size) {
 385             goto size_error;
 386         }
 387         do_client_clipboard(vport, message_header, data);
 388         break;
 389     case VD_AGENT_FILE_XFER_START:
 390     case VD_AGENT_FILE_XFER_STATUS:
 391     case VD_AGENT_FILE_XFER_DATA:
 392         do_client_file_xfer(vport, message_header, data);
 393         break;
 394     case VD_AGENT_CLIENT_DISCONNECTED:
 395         vdagent_virtio_port_reset(vport, VDP_CLIENT_PORT);
 396         do_client_disconnect();
 397         break;
 398     case VD_AGENT_MAX_CLIPBOARD:
 399         if (message_header->size != sizeof(VDAgentMaxClipboard))
 400             goto size_error;
 401         VDAgentMaxClipboard *msg = (VDAgentMaxClipboard *)data;
 402         syslog(LOG_DEBUG, "Set max clipboard: %d", msg->max);
 403         max_clipboard = msg->max;
 404         break;
 405     case VD_AGENT_AUDIO_VOLUME_SYNC:
 406         if (message_header->size < sizeof(VDAgentAudioVolumeSync))
 407             goto size_error;
 408
 409         do_client_volume_sync(vport, port_nr, message_header,
 410                 (VDAgentAudioVolumeSync *)data);
 411         break;
 412     default:
 413         syslog(LOG_WARNING, "unknown message type %d, ignoring",
 414                message_header->type);
 415     }
 416
 417     return 0;
 418
 419 size_error:
 420     syslog(LOG_ERR, "read: invalid message size: %u for message type: %u",
 421            message_header->size, message_header->type);
 422     return 0;
 423 }
 424
 425 static void virtio_write_clipboard(uint8_t selection, uint32_t msg_type,
 426     uint32_t data_type, const uint8_t *data, uint32_t data_size)
 427 {
 428     uint32_t size = data_size;
 429
 430     if (VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
 431                                 VD_AGENT_CAP_CLIPBOARD_SELECTION)) {
 432         size += 4;
 433     }
 434     if (data_type != -1) {
 435         size += 4;
 436     }
 437
 438     vdagent_virtio_port_write_start(virtio_port, VDP_CLIENT_PORT, msg_type,
 439                                     0, size);
 440
 441     if (VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
 442                                 VD_AGENT_CAP_CLIPBOARD_SELECTION)) {
 443         uint8_t sel[4] = { selection, 0, 0, 0 };
 444         vdagent_virtio_port_write_append(virtio_port, sel, 4);
 445     }
 446     if (data_type != -1) {
 447         vdagent_virtio_port_write_append(virtio_port, (uint8_t*)&data_type, 4);
 448     }
 449
 450     vdagent_virtio_port_write_append(virtio_port, data, data_size);
 451 }
 452
 453 /* vdagentd <-> vdagent communication handling */
 454 static int do_agent_clipboard(struct udscs_connection *conn,
 455         struct udscs_message_header *header, const uint8_t *data)
 456 {
 457     uint8_t selection = header->arg1;
 458     uint32_t msg_type = 0, data_type = -1, size = header->size;
 459
 460     if (!VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
 461                                  VD_AGENT_CAP_CLIPBOARD_BY_DEMAND))
 462         goto error;
 463
 464     /* Check that this agent is from the currently active session */
 465     if (conn != active_session_conn) {
 466         if (debug)
 467             syslog(LOG_DEBUG, "%p clipboard req from agent which is not in "
 468                               "the active session?", conn);
 469         goto error;
 470     }
 471
 472     if (!virtio_port) {
 473         syslog(LOG_ERR, "Clipboard req from agent but no client connection");
 474         goto error;
 475     }
 476
 477     if (!VD_AGENT_HAS_CAPABILITY(capabilities, capabilities_size,
 478                                  VD_AGENT_CAP_CLIPBOARD_SELECTION) &&
 479             selection != VD_AGENT_CLIPBOARD_SELECTION_CLIPBOARD) {
 480         goto error;
 481     }
 482
 483     switch (header->type) {
 484     case VDAGENTD_CLIPBOARD_GRAB:
 485         msg_type = VD_AGENT_CLIPBOARD_GRAB;
 486         agent_owns_clipboard[selection] = 1;
 487         break;
 488     case VDAGENTD_CLIPBOARD_REQUEST:
 489         msg_type = VD_AGENT_CLIPBOARD_REQUEST;
 490         data_type = header->arg2;
 491         size = 0;
 492         break;
 493     case VDAGENTD_CLIPBOARD_DATA:
 494         msg_type = VD_AGENT_CLIPBOARD;
 495         data_type = header->arg2;
 496         if (max_clipboard != -1 && size > max_clipboard) {
 497             syslog(LOG_WARNING, "clipboard is too large (%d > %d), discarding",
 498                    size, max_clipboard);
 499             virtio_write_clipboard(selection, msg_type, data_type, NULL, 0);
 500             return 0;
 501         }
 502         break;
 503     case VDAGENTD_CLIPBOARD_RELEASE:
 504         msg_type = VD_AGENT_CLIPBOARD_RELEASE;
 505         size = 0;
 506         agent_owns_clipboard[selection] = 0;
 507         break;
 508     default:
 509         syslog(LOG_WARNING, "unexpected clipboard message type");
 510         goto error;
 511     }
 512
 513     if (size != header->size) {
 514         syslog(LOG_ERR,
 515                "unexpected extra data in clipboard msg, disconnecting agent");
 516         return -1;
 517     }
 518
 519     virtio_write_clipboard(selection, msg_type, data_type, data, header->size);
 520
 521     return 0;
 522
 523 error:
 524     if (header->type == VDAGENTD_CLIPBOARD_REQUEST) {
 525         /* Let the agent know no answer is coming */
 526         udscs_write(conn, VDAGENTD_CLIPBOARD_DATA,
 527                     selection, VD_AGENT_CLIPBOARD_NONE, NULL, 0);
 528     }
 529     return 0;
 530 }
 531
 532 /* When we open the vdagent virtio channel, the server automatically goes into
 533    client mouse mode, so we can only have the channel open when we know the
 534    active session resolution. This function checks that we have an agent in the
 535    active session, and that it has told us its resolution. If these conditions
 536    are met it sets the uinput tablet device's resolution and opens the virtio
 537    channel (if it is not already open). If these conditions are not met, it
 538    closes both. */
 539 static void check_xorg_resolution(void)
 540 {
 541     struct agent_data *agent_data = udscs_get_user_data(active_session_conn);
 542
 543     if (agent_data && agent_data->screen_info) {
 544         if (!uinput)
 545             uinput = vdagentd_uinput_create(uinput_device,
 546                                             agent_data->width,
 547                                             agent_data->height,
 548                                             agent_data->screen_info,
 549                                             agent_data->screen_count,
 550                                             debug > 1,
 551                                             uinput_fake);
 552         else
 553             vdagentd_uinput_update_size(&uinput,
 554                                         agent_data->width,
 555                                         agent_data->height,
 556                                         agent_data->screen_info,
 557                                         agent_data->screen_count);
 558         if (!uinput) {
 559             syslog(LOG_CRIT, "Fatal uinput error");
 560             retval = 1;
 561             quit = 1;
 562             return;
 563         }
 564
 565         if (!virtio_port) {
 566             syslog(LOG_INFO, "opening vdagent virtio channel");
 567             virtio_port = vdagent_virtio_port_create(portdev,
 568                                                      virtio_port_read_complete,
 569                                                      NULL);
 570             if (!virtio_port) {
 571                 syslog(LOG_CRIT, "Fatal error opening vdagent virtio channel");
 572                 retval = 1;
 573                 quit = 1;
 574                 return;
 575             }
 576             send_capabilities(virtio_port, 1);
 577         }
 578     } else {
 579 #ifndef WITH_STATIC_UINPUT
 580         vdagentd_uinput_destroy(&uinput);
 581 #endif
 582         if (virtio_port) {
 583             vdagent_virtio_port_flush(&virtio_port);
 584             vdagent_virtio_port_destroy(&virtio_port);
 585             syslog(LOG_INFO, "closed vdagent virtio channel");
 586         }
 587     }
 588 }
 589
 590 static int connection_matches_active_session(struct udscs_connection **connp,
 591     void *priv)
 592 {
 593     struct udscs_connection **conn_ret = (struct udscs_connection **)priv;
 594     struct agent_data *agent_data = udscs_get_user_data(*connp);
 595
 596     /* Check if this connection matches the currently active session */
 597     if (!agent_data->session || !active_session)
 598         return 0;
 599     if (strcmp(agent_data->session, active_session))
 600         return 0;
 601
 602     *conn_ret = *connp;
 603     return 1;
 604 }
 605
 606 static void release_clipboards(void)
 607 {
 608     uint8_t sel;
 609
 610     for (sel = 0; sel < VD_AGENT_CLIPBOARD_SELECTION_SECONDARY; ++sel) {
 611         if (agent_owns_clipboard[sel] && virtio_port) {
 612             vdagent_virtio_port_write(virtio_port, VDP_CLIENT_PORT,
 613                                       VD_AGENT_CLIPBOARD_RELEASE, 0, &sel, 1);
 614         }
 615         agent_owns_clipboard[sel] = 0;
 616     }
 617 }
 618
 619 static void update_active_session_connection(struct udscs_connection *new_conn)
 620 {
 621     if (session_info) {
 622         new_conn = NULL;
 623         if (!active_session)
 624             active_session = session_info_get_active_session(session_info);
 625         session_count = udscs_server_for_all_clients(server,
 626                                          connection_matches_active_session,
 627                                          (void*)&new_conn);
 628     } else {
 629         if (new_conn)
 630             session_count++;
 631         else
 632             session_count--;
 633     }
 634
 635     if (new_conn && session_count != 1) {
 636         syslog(LOG_ERR, "multiple agents in one session, "
 637                "disabling agent to avoid potential information leak");
 638         new_conn = NULL;
 639     }
 640
 641     if (new_conn == active_session_conn)
 642         return;
 643
 644     active_session_conn = new_conn;
 645     if (debug)
 646         syslog(LOG_DEBUG, "%p is now the active session", new_conn);
 647
 648     if (active_session_conn && !session_info_is_user(session_info)) {
 649         if (debug)
 650             syslog(LOG_DEBUG, "New session agent does not belong to user: "
 651                    "disabling file-xfer");
 652         udscs_write(active_session_conn, VDAGENTD_FILE_XFER_DISABLE, 0, 0,
 653                     NULL, 0);
 654     }
 655
 656     if (active_session_conn && mon_config)
 657         udscs_write(active_session_conn, VDAGENTD_MONITORS_CONFIG, 0, 0,
 658                     (uint8_t *)mon_config, sizeof(VDAgentMonitorsConfig) +
 659                     mon_config->num_of_monitors * sizeof(VDAgentMonConfig));
 660
 661     release_clipboards();
 662
 663     check_xorg_resolution();
 664 }
 665
 666 static gboolean remove_active_xfers(gpointer key, gpointer value, gpointer conn)
 667 {
 668     if (value == conn) {
 669         send_file_xfer_status(virtio_port,
 670                               "Agent disc; cancelling file-xfer %u",
 671                               GPOINTER_TO_UINT(key),
 672                               VD_AGENT_FILE_XFER_STATUS_CANCELLED);
 673         return 1;
 674     } else
 675         return 0;
 676 }
 677
 678 static void agent_connect(struct udscs_connection *conn)
 679 {
 680     struct agent_data *agent_data;
 681
 682     agent_data = calloc(1, sizeof(*agent_data));
 683     if (!agent_data) {
 684         syslog(LOG_ERR, "Out of memory allocating agent data, disconnecting");
 685         udscs_destroy_connection(&conn);
 686         return;
 687     }
 688
 689     if (session_info) {
 690         uint32_t pid = udscs_get_peer_cred(conn).pid;
 691         agent_data->session = session_info_session_for_pid(session_info, pid);
 692     }
 693
 694     udscs_set_user_data(conn, (void *)agent_data);
 695     udscs_write(conn, VDAGENTD_VERSION, 0, 0,
 696                 (uint8_t *)VERSION, strlen(VERSION) + 1);
 697     update_active_session_connection(conn);
 698 }
 699
 700 static void agent_disconnect(struct udscs_connection *conn)
 701 {
 702     struct agent_data *agent_data = udscs_get_user_data(conn);
 703
 704     g_hash_table_foreach_remove(active_xfers, remove_active_xfers, conn);
 705
 706     free(agent_data->session);
 707     agent_data->session = NULL;
 708     update_active_session_connection(NULL);
 709
 710     free(agent_data->screen_info);
 711     free(agent_data);
 712 }
 713
 714 static void agent_read_complete(struct udscs_connection **connp,
 715     struct udscs_message_header *header, uint8_t *data)
 716 {
 717     struct agent_data *agent_data = udscs_get_user_data(*connp);
 718
 719     switch (header->type) {
 720     case VDAGENTD_GUEST_XORG_RESOLUTION: {
 721         struct vdagentd_guest_xorg_resolution *res;
 722         int n = header->size / sizeof(*res);
 723
 724         /* Detect older version session agent, but don't disconnect, as
 725            that stops it from getting the VDAGENTD_VERSION message, and then
 726            it will never re-exec the new version... */
 727         if (header->arg1 == 0 && header->arg2 == 0) {
 728             syslog(LOG_INFO, "got old session agent xorg resolution message, "
 729                              "ignoring");
 730             free(data);
 731             return;
 732         }
 733
 734         if (header->size != n * sizeof(*res)) {
 735             syslog(LOG_ERR, "guest xorg resolution message has wrong size, "
 736                             "disconnecting agent");
 737             udscs_destroy_connection(connp);
 738             free(data);
 739             return;
 740         }
 741
 742         free(agent_data->screen_info);
 743         res = malloc(n * sizeof(*res));
 744         if (!res) {
 745             syslog(LOG_ERR, "out of memory allocating screen info");
 746             n = 0;
 747         }
 748         memcpy(res, data, n * sizeof(*res));
 749         agent_data->width  = header->arg1;
 750         agent_data->height = header->arg2;
 751         agent_data->screen_info  = res;
 752         agent_data->screen_count = n;
 753
 754         check_xorg_resolution();
 755         break;
 756     }
 757     case VDAGENTD_CLIPBOARD_GRAB:
 758     case VDAGENTD_CLIPBOARD_REQUEST:
 759     case VDAGENTD_CLIPBOARD_DATA:
 760     case VDAGENTD_CLIPBOARD_RELEASE:
 761         if (do_agent_clipboard(*connp, header, data)) {
 762             udscs_destroy_connection(connp);
 763             free(data);
 764             return;
 765         }
 766         break;
 767     case VDAGENTD_FILE_XFER_STATUS:{
 768         VDAgentFileXferStatusMessage status;
 769         status.id = header->arg1;
 770         status.result = header->arg2;
 771         vdagent_virtio_port_write(virtio_port, VDP_CLIENT_PORT,
 772                                   VD_AGENT_FILE_XFER_STATUS, 0,
 773                                   (uint8_t *)&status, sizeof(status));
 774         if (status.result == VD_AGENT_FILE_XFER_STATUS_CAN_SEND_DATA)
 775             g_hash_table_insert(active_xfers, GUINT_TO_POINTER(status.id),
 776                                 *connp);
 777         else
 778             g_hash_table_remove(active_xfers, GUINT_TO_POINTER(status.id));
 779         break;
 780     }
 781
 782     default:
 783         syslog(LOG_ERR, "unknown message from vdagent: %u, ignoring",
 784                header->type);
 785     }
 786     free(data);
 787 }
 788
 789 /* main */
 790
 791 static void usage(FILE *fp)
 792 {
 793     fprintf(fp,
 794             "Usage: spice-vdagentd [OPTIONS]\n\n"
 795             "Spice guest agent daemon, version %s.\n\n"
 796             "Options:\n"
 797             "  -h             print this text\n"
 798             "  -d             log debug messages (use twice for extra info)\n"
 799             "  -s <port>      set virtio serial port  [%s]\n"
 800             "  -S <filename>  set udcs socket [%s]\n"
 801             "  -u <dev>       set uinput device       [%s]\n"
 802             "  -f             treat uinput device as fake; no ioctls\n"
 803             "  -x             don't daemonize\n"
 804             "  -o             Only handle one virtio serial session.\n"
 805 #ifdef HAVE_CONSOLE_KIT
 806             "  -X             Disable console kit integration\n"
 807 #endif
 808 #ifdef HAVE_LIBSYSTEMD_LOGIN
 809             "  -X         Disable systemd-logind integration\n"
 810 #endif
 811             ,VERSION, portdev, vdagentd_socket, uinput_device);
 812 }
 813
 814 static void daemonize(void)
 815 {
 816     int x;
 817     FILE *pidfile;
 818
 819     /* detach from terminal */
 820     switch (fork()) {
 821     case 0:
 822         close(0); close(1); close(2);
 823         setsid();
 824         x = open("/dev/null", O_RDWR); x = dup(x); x = dup(x);
 825         pidfile = fopen(pidfilename, "w");
 826         if (pidfile) {
 827             fprintf(pidfile, "%d\n", (int)getpid());
 828             fclose(pidfile);
 829         }
 830         break;
 831     case -1:
 832         syslog(LOG_ERR, "fork: %m");
 833         retval = 1;
 834     default:
 835         udscs_destroy_server(server);
 836         exit(retval);
 837     }
 838 }
 839
 840 static void main_loop(void)
 841 {
 842     fd_set readfds, writefds;
 843     int n, nfds;
 844     int ck_fd = 0;
 845     int once = 0;
 846
 847     while (!quit) {
 848         FD_ZERO(&readfds);
 849         FD_ZERO(&writefds);
 850
 851         nfds = udscs_server_fill_fds(server, &readfds, &writefds);
 852         n = vdagent_virtio_port_fill_fds(virtio_port, &readfds, &writefds);
 853         if (n >= nfds)
 854             nfds = n + 1;
 855
 856         if (session_info) {
 857             ck_fd = session_info_get_fd(session_info);
 858             FD_SET(ck_fd, &readfds);
 859             if (ck_fd >= nfds)
 860                 nfds = ck_fd + 1;
 861         }
 862
 863         n = select(nfds, &readfds, &writefds, NULL, NULL);
 864         if (n == -1) {
 865             if (errno == EINTR)
 866                 continue;
 867             syslog(LOG_CRIT, "Fatal error select: %m");
 868             retval = 1;
 869             break;
 870         }
 871
 872         udscs_server_handle_fds(server, &readfds, &writefds);
 873
 874         if (virtio_port) {
 875             once = 1;
 876             vdagent_virtio_port_handle_fds(&virtio_port, &readfds, &writefds);
 877             if (!virtio_port) {
 878                 int old_client_connected = client_connected;
 879                 syslog(LOG_CRIT,
 880                        "AIIEEE lost spice client connection, reconnecting");
 881                 virtio_port = vdagent_virtio_port_create(portdev,
 882                                                      virtio_port_read_complete,
 883                                                      NULL);
 884                 if (!virtio_port) {
 885                     syslog(LOG_CRIT,
 886                            "Fatal error opening vdagent virtio channel");
 887                     retval = 1;
 888                     break;
 889                 }
 890                 do_client_disconnect();
 891                 client_connected = old_client_connected;
 892             }
 893         }
 894         else if (only_once && once)
 895         {
 896             syslog(LOG_INFO, "Exiting after one client session.");
 897             break;
 898         }
 899
 900         if (session_info && FD_ISSET(ck_fd, &readfds)) {
 901             active_session = session_info_get_active_session(session_info);
 902             update_active_session_connection(NULL);
 903         }
 904     }
 905 }
 906
 907 static void quit_handler(int sig)
 908 {
 909     quit = 1;
 910 }
 911
 912 int main(int argc, char *argv[])
 913 {
 914     int c;
 915     int do_daemonize = 1;
 916     int want_session_info = 1;
 917     struct sigaction act;
 918
 919     for (;;) {
 920         if (-1 == (c = getopt(argc, argv, "-dhxXfos:u:S:")))
 921             break;
 922         switch (c) {
 923         case 'd':
 924             debug++;
 925             break;
 926         case 's':
 927             portdev = optarg;
 928             break;
 929         case 'S':
 930             vdagentd_socket = optarg;
 931             break;
 932         case 'u':
 933             uinput_device = optarg;
 934             break;
 935         case 'f':
 936             uinput_fake = 1;
 937             break;
 938         case 'o':
 939             only_once = 1;
 940             break;
 941         case 'x':
 942             do_daemonize = 0;
 943             break;
 944         case 'X':
 945             want_session_info = 0;
 946             break;
 947         case 'h':
 948             usage(stdout);
 949             return 0;
 950         default:
 951             fputs("\n", stderr);
 952             usage(stderr);
 953             return 1;
 954         }
 955     }
 956
 957     memset(&act, 0, sizeof(act));
 958     act.sa_flags = SA_RESTART;
 959     act.sa_handler = quit_handler;
 960     sigaction(SIGINT, &act, NULL);
 961     sigaction(SIGHUP, &act, NULL);
 962     sigaction(SIGTERM, &act, NULL);
 963     sigaction(SIGQUIT, &act, NULL);
 964
 965     openlog("spice-vdagentd", do_daemonize ? 0 : LOG_PERROR, LOG_USER);
 966
 967     /* Setup communication with vdagent process(es) */
 968     server = udscs_create_server(vdagentd_socket, agent_connect,
 969                                  agent_read_complete, agent_disconnect,
 970                                  vdagentd_messages, VDAGENTD_NO_MESSAGES,
 971                                  debug);
 972     if (!server) {
 973         syslog(LOG_CRIT, "Fatal could not create server socket %s",
 974                vdagentd_socket);
 975         return 1;
 976     }
 977     if (chmod(vdagentd_socket, 0666)) {
 978         syslog(LOG_CRIT, "Fatal could not change permissions on %s: %m",
 979                vdagentd_socket);
 980         udscs_destroy_server(server);
 981         return 1;
 982     }
 983
 984     if (do_daemonize)
 985         daemonize();
 986
 987 #ifdef WITH_STATIC_UINPUT
 988     uinput = vdagentd_uinput_create(uinput_device, 1024, 768, NULL, 0,
 989                                     debug > 1, uinput_fake);
 990     if (!uinput) {
 991         udscs_destroy_server(server);
 992         return 1;
 993     }
 994 #endif
 995
 996     if (want_session_info)
 997         session_info = session_info_create(debug);
 998     if (!session_info)
 999         syslog(LOG_WARNING, "no session info, max 1 session agent allowed");
1000
1001     active_xfers = g_hash_table_new(g_direct_hash, g_direct_equal);
1002     main_loop();
1003
1004     release_clipboards();
1005
1006     vdagentd_uinput_destroy(&uinput);
1007     vdagent_virtio_port_flush(&virtio_port);
1008     vdagent_virtio_port_destroy(&virtio_port);
1009     session_info_destroy(session_info);
1010     udscs_destroy_server(server);
1011     if (unlink(vdagentd_socket) != 0)
1012         syslog(LOG_ERR, "unlink %s: %s", vdagentd_socket, strerror(errno));
1013     syslog(LOG_INFO, "vdagentd quiting, returning status %d", retval);
1014
1015     if (do_daemonize)
1016         unlink(pidfilename);
1017
1018     return retval;
1019 }