Merge remote-tracking branch 'remotes/bonzini-gitlab/tags/for-upstream' into staging
[qemu.git] / qga / main.c
1 /*
2 * QEMU Guest Agent
3 *
4 * Copyright IBM Corp. 2011
5 *
6 * Authors:
7 * Adam Litke <aglitke@linux.vnet.ibm.com>
8 * Michael Roth <mdroth@linux.vnet.ibm.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
12 */
13
14 #include "qemu/osdep.h"
15 #include <getopt.h>
16 #include <glib/gstdio.h>
17 #ifndef _WIN32
18 #include <syslog.h>
19 #include <sys/wait.h>
20 #endif
21 #include "qemu-common.h"
22 #include "qapi/qmp/json-parser.h"
23 #include "qapi/qmp/qdict.h"
24 #include "qapi/qmp/qjson.h"
25 #include "guest-agent-core.h"
26 #include "qga-qapi-init-commands.h"
27 #include "qapi/qmp/qerror.h"
28 #include "qapi/error.h"
29 #include "channel.h"
30 #include "qemu/bswap.h"
31 #include "qemu/cutils.h"
32 #include "qemu/help_option.h"
33 #include "qemu/sockets.h"
34 #include "qemu/systemd.h"
35 #include "qemu-version.h"
36 #ifdef _WIN32
37 #include <dbt.h>
38 #include "qga/service-win32.h"
39 #include "qga/vss-win32.h"
40 #endif
41 #ifdef __linux__
42 #include <linux/fs.h>
43 #ifdef FIFREEZE
44 #define CONFIG_FSFREEZE
45 #endif
46 #endif
47
48 #ifndef _WIN32
49 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
50 #define QGA_STATE_RELATIVE_DIR "run"
51 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
52 #else
53 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
54 #define QGA_STATE_RELATIVE_DIR "qemu-ga"
55 #define QGA_SERIAL_PATH_DEFAULT "COM1"
56 #endif
57 #ifdef CONFIG_FSFREEZE
58 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
59 #endif
60 #define QGA_SENTINEL_BYTE 0xFF
61 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
62 #define QGA_RETRY_INTERVAL 5
63
64 static struct {
65 const char *state_dir;
66 const char *pidfile;
67 } dfl_pathnames;
68
69 typedef struct GAPersistentState {
70 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
71 int64_t fd_counter;
72 } GAPersistentState;
73
74 typedef struct GAConfig GAConfig;
75
76 struct GAState {
77 JSONMessageParser parser;
78 GMainLoop *main_loop;
79 GAChannel *channel;
80 bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
81 GACommandState *command_state;
82 GLogLevelFlags log_level;
83 FILE *log_file;
84 bool logging_enabled;
85 #ifdef _WIN32
86 GAService service;
87 HANDLE wakeup_event;
88 #endif
89 bool delimit_response;
90 bool frozen;
91 GList *blacklist;
92 char *state_filepath_isfrozen;
93 struct {
94 const char *log_filepath;
95 const char *pid_filepath;
96 } deferred_options;
97 #ifdef CONFIG_FSFREEZE
98 const char *fsfreeze_hook;
99 #endif
100 gchar *pstate_filepath;
101 GAPersistentState pstate;
102 GAConfig *config;
103 int socket_activation;
104 bool force_exit;
105 };
106
107 struct GAState *ga_state;
108 QmpCommandList ga_commands;
109
110 /* commands that are safe to issue while filesystems are frozen */
111 static const char *ga_freeze_whitelist[] = {
112 "guest-ping",
113 "guest-info",
114 "guest-sync",
115 "guest-sync-delimited",
116 "guest-fsfreeze-status",
117 "guest-fsfreeze-thaw",
118 NULL
119 };
120
121 #ifdef _WIN32
122 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
123 LPVOID ctx);
124 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data);
125 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
126 #endif
127 static int run_agent(GAState *s);
128 static void stop_agent(GAState *s, bool requested);
129
130 static void
131 init_dfl_pathnames(void)
132 {
133 g_assert(dfl_pathnames.state_dir == NULL);
134 g_assert(dfl_pathnames.pidfile == NULL);
135 dfl_pathnames.state_dir = qemu_get_local_state_pathname(
136 QGA_STATE_RELATIVE_DIR);
137 dfl_pathnames.pidfile = qemu_get_local_state_pathname(
138 QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
139 }
140
141 static void quit_handler(int sig)
142 {
143 /* if we're frozen, don't exit unless we're absolutely forced to,
144 * because it's basically impossible for graceful exit to complete
145 * unless all log/pid files are on unfreezable filesystems. there's
146 * also a very likely chance killing the agent before unfreezing
147 * the filesystems is a mistake (or will be viewed as one later).
148 * On Windows the freeze interval is limited to 10 seconds, so
149 * we should quit, but first we should wait for the timeout, thaw
150 * the filesystem and quit.
151 */
152 if (ga_is_frozen(ga_state)) {
153 #ifdef _WIN32
154 int i = 0;
155 Error *err = NULL;
156 HANDLE hEventTimeout;
157
158 g_debug("Thawing filesystems before exiting");
159
160 hEventTimeout = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_TIMEOUT);
161 if (hEventTimeout) {
162 WaitForSingleObject(hEventTimeout, 0);
163 CloseHandle(hEventTimeout);
164 }
165 qga_vss_fsfreeze(&i, false, NULL, &err);
166 if (err) {
167 g_debug("Error unfreezing filesystems prior to exiting: %s",
168 error_get_pretty(err));
169 error_free(err);
170 }
171 #else
172 return;
173 #endif
174 }
175 g_debug("received signal num %d, quitting", sig);
176
177 stop_agent(ga_state, true);
178 }
179
180 #ifndef _WIN32
181 static gboolean register_signal_handlers(void)
182 {
183 struct sigaction sigact;
184 int ret;
185
186 memset(&sigact, 0, sizeof(struct sigaction));
187 sigact.sa_handler = quit_handler;
188
189 ret = sigaction(SIGINT, &sigact, NULL);
190 if (ret == -1) {
191 g_error("error configuring signal handler: %s", strerror(errno));
192 }
193 ret = sigaction(SIGTERM, &sigact, NULL);
194 if (ret == -1) {
195 g_error("error configuring signal handler: %s", strerror(errno));
196 }
197
198 sigact.sa_handler = SIG_IGN;
199 if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
200 g_error("error configuring SIGPIPE signal handler: %s",
201 strerror(errno));
202 }
203
204 return true;
205 }
206
207 /* TODO: use this in place of all post-fork() fclose(std*) callers */
208 void reopen_fd_to_null(int fd)
209 {
210 int nullfd;
211
212 nullfd = open("/dev/null", O_RDWR);
213 if (nullfd < 0) {
214 return;
215 }
216
217 dup2(nullfd, fd);
218
219 if (nullfd != fd) {
220 close(nullfd);
221 }
222 }
223 #endif
224
225 static void usage(const char *cmd)
226 {
227 printf(
228 "Usage: %s [-m <method> -p <path>] [<options>]\n"
229 "QEMU Guest Agent " QEMU_FULL_VERSION "\n"
230 QEMU_COPYRIGHT "\n"
231 "\n"
232 " -m, --method transport method: one of unix-listen, virtio-serial,\n"
233 " isa-serial, or vsock-listen (virtio-serial is the default)\n"
234 " -p, --path device/socket path (the default for virtio-serial is:\n"
235 " %s,\n"
236 " the default for isa-serial is:\n"
237 " %s).\n"
238 " Socket addresses for vsock-listen are written as\n"
239 " <cid>:<port>.\n"
240 " -l, --logfile set logfile path, logs to stderr by default\n"
241 " -f, --pidfile specify pidfile (default is %s)\n"
242 #ifdef CONFIG_FSFREEZE
243 " -F, --fsfreeze-hook\n"
244 " enable fsfreeze hook. Accepts an optional argument that\n"
245 " specifies script to run on freeze/thaw. Script will be\n"
246 " called with 'freeze'/'thaw' arguments accordingly.\n"
247 " (default is %s)\n"
248 " If using -F with an argument, do not follow -F with a\n"
249 " space.\n"
250 " (for example: -F/var/run/fsfreezehook.sh)\n"
251 #endif
252 " -t, --statedir specify dir to store state information (absolute paths\n"
253 " only, default is %s)\n"
254 " -v, --verbose log extra debugging information\n"
255 " -V, --version print version information and exit\n"
256 " -d, --daemonize become a daemon\n"
257 #ifdef _WIN32
258 " -s, --service service commands: install, uninstall, vss-install, vss-uninstall\n"
259 #endif
260 " -b, --blacklist comma-separated list of RPCs to disable (no spaces, \"?\"\n"
261 " to list available RPCs)\n"
262 " -D, --dump-conf dump a qemu-ga config file based on current config\n"
263 " options / command-line parameters to stdout\n"
264 " -r, --retry-path attempt re-opening path if it's unavailable or closed\n"
265 " due to an error which may be recoverable in the future\n"
266 " (virtio-serial driver re-install, serial device hot\n"
267 " plug/unplug, etc.)\n"
268 " -h, --help display this help and exit\n"
269 "\n"
270 QEMU_HELP_BOTTOM "\n"
271 , cmd, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
272 dfl_pathnames.pidfile,
273 #ifdef CONFIG_FSFREEZE
274 QGA_FSFREEZE_HOOK_DEFAULT,
275 #endif
276 dfl_pathnames.state_dir);
277 }
278
279 static const char *ga_log_level_str(GLogLevelFlags level)
280 {
281 switch (level & G_LOG_LEVEL_MASK) {
282 case G_LOG_LEVEL_ERROR:
283 return "error";
284 case G_LOG_LEVEL_CRITICAL:
285 return "critical";
286 case G_LOG_LEVEL_WARNING:
287 return "warning";
288 case G_LOG_LEVEL_MESSAGE:
289 return "message";
290 case G_LOG_LEVEL_INFO:
291 return "info";
292 case G_LOG_LEVEL_DEBUG:
293 return "debug";
294 default:
295 return "user";
296 }
297 }
298
299 bool ga_logging_enabled(GAState *s)
300 {
301 return s->logging_enabled;
302 }
303
304 void ga_disable_logging(GAState *s)
305 {
306 s->logging_enabled = false;
307 }
308
309 void ga_enable_logging(GAState *s)
310 {
311 s->logging_enabled = true;
312 }
313
314 static void ga_log(const gchar *domain, GLogLevelFlags level,
315 const gchar *msg, gpointer opaque)
316 {
317 GAState *s = opaque;
318 GTimeVal time;
319 const char *level_str = ga_log_level_str(level);
320
321 if (!ga_logging_enabled(s)) {
322 return;
323 }
324
325 level &= G_LOG_LEVEL_MASK;
326 #ifndef _WIN32
327 if (g_strcmp0(domain, "syslog") == 0) {
328 syslog(LOG_INFO, "%s: %s", level_str, msg);
329 } else if (level & s->log_level) {
330 #else
331 if (level & s->log_level) {
332 #endif
333 g_get_current_time(&time);
334 fprintf(s->log_file,
335 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
336 fflush(s->log_file);
337 }
338 }
339
340 void ga_set_response_delimited(GAState *s)
341 {
342 s->delimit_response = true;
343 }
344
345 static FILE *ga_open_logfile(const char *logfile)
346 {
347 FILE *f;
348
349 f = fopen(logfile, "a");
350 if (!f) {
351 return NULL;
352 }
353
354 qemu_set_cloexec(fileno(f));
355 return f;
356 }
357
358 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
359 {
360 return strcmp(str1, str2);
361 }
362
363 /* disable commands that aren't safe for fsfreeze */
364 static void ga_disable_non_whitelisted(const QmpCommand *cmd, void *opaque)
365 {
366 bool whitelisted = false;
367 int i = 0;
368 const char *name = qmp_command_name(cmd);
369
370 while (ga_freeze_whitelist[i] != NULL) {
371 if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
372 whitelisted = true;
373 }
374 i++;
375 }
376 if (!whitelisted) {
377 g_debug("disabling command: %s", name);
378 qmp_disable_command(&ga_commands, name, "the agent is in frozen state");
379 }
380 }
381
382 /* [re-]enable all commands, except those explicitly blacklisted by user */
383 static void ga_enable_non_blacklisted(const QmpCommand *cmd, void *opaque)
384 {
385 GList *blacklist = opaque;
386 const char *name = qmp_command_name(cmd);
387
388 if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
389 !qmp_command_is_enabled(cmd)) {
390 g_debug("enabling command: %s", name);
391 qmp_enable_command(&ga_commands, name);
392 }
393 }
394
395 static bool ga_create_file(const char *path)
396 {
397 int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
398 if (fd == -1) {
399 g_warning("unable to open/create file %s: %s", path, strerror(errno));
400 return false;
401 }
402 close(fd);
403 return true;
404 }
405
406 static bool ga_delete_file(const char *path)
407 {
408 int ret = unlink(path);
409 if (ret == -1) {
410 g_warning("unable to delete file: %s: %s", path, strerror(errno));
411 return false;
412 }
413
414 return true;
415 }
416
417 bool ga_is_frozen(GAState *s)
418 {
419 return s->frozen;
420 }
421
422 void ga_set_frozen(GAState *s)
423 {
424 if (ga_is_frozen(s)) {
425 return;
426 }
427 /* disable all non-whitelisted (for frozen state) commands */
428 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
429 g_warning("disabling logging due to filesystem freeze");
430 ga_disable_logging(s);
431 s->frozen = true;
432 if (!ga_create_file(s->state_filepath_isfrozen)) {
433 g_warning("unable to create %s, fsfreeze may not function properly",
434 s->state_filepath_isfrozen);
435 }
436 }
437
438 void ga_unset_frozen(GAState *s)
439 {
440 if (!ga_is_frozen(s)) {
441 return;
442 }
443
444 /* if we delayed creation/opening of pid/log files due to being
445 * in a frozen state at start up, do it now
446 */
447 if (s->deferred_options.log_filepath) {
448 s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
449 if (!s->log_file) {
450 s->log_file = stderr;
451 }
452 s->deferred_options.log_filepath = NULL;
453 }
454 ga_enable_logging(s);
455 g_warning("logging re-enabled due to filesystem unfreeze");
456 if (s->deferred_options.pid_filepath) {
457 Error *err = NULL;
458
459 if (!qemu_write_pidfile(s->deferred_options.pid_filepath, &err)) {
460 g_warning("%s", error_get_pretty(err));
461 error_free(err);
462 }
463 s->deferred_options.pid_filepath = NULL;
464 }
465
466 /* enable all disabled, non-blacklisted commands */
467 qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
468 s->frozen = false;
469 if (!ga_delete_file(s->state_filepath_isfrozen)) {
470 g_warning("unable to delete %s, fsfreeze may not function properly",
471 s->state_filepath_isfrozen);
472 }
473 }
474
475 #ifdef CONFIG_FSFREEZE
476 const char *ga_fsfreeze_hook(GAState *s)
477 {
478 return s->fsfreeze_hook;
479 }
480 #endif
481
482 static void become_daemon(const char *pidfile)
483 {
484 #ifndef _WIN32
485 pid_t pid, sid;
486
487 pid = fork();
488 if (pid < 0) {
489 exit(EXIT_FAILURE);
490 }
491 if (pid > 0) {
492 exit(EXIT_SUCCESS);
493 }
494
495 if (pidfile) {
496 Error *err = NULL;
497
498 if (!qemu_write_pidfile(pidfile, &err)) {
499 g_critical("%s", error_get_pretty(err));
500 error_free(err);
501 exit(EXIT_FAILURE);
502 }
503 }
504
505 umask(S_IRWXG | S_IRWXO);
506 sid = setsid();
507 if (sid < 0) {
508 goto fail;
509 }
510 if ((chdir("/")) < 0) {
511 goto fail;
512 }
513
514 reopen_fd_to_null(STDIN_FILENO);
515 reopen_fd_to_null(STDOUT_FILENO);
516 reopen_fd_to_null(STDERR_FILENO);
517 return;
518
519 fail:
520 if (pidfile) {
521 unlink(pidfile);
522 }
523 g_critical("failed to daemonize");
524 exit(EXIT_FAILURE);
525 #endif
526 }
527
528 static int send_response(GAState *s, const QDict *rsp)
529 {
530 GString *response;
531 GIOStatus status;
532
533 g_assert(s->channel);
534
535 if (!rsp) {
536 return 0;
537 }
538
539 response = qobject_to_json(QOBJECT(rsp));
540 if (!response) {
541 return -EINVAL;
542 }
543
544 if (s->delimit_response) {
545 s->delimit_response = false;
546 g_string_prepend_c(response, QGA_SENTINEL_BYTE);
547 }
548
549 g_string_append_c(response, '\n');
550 status = ga_channel_write_all(s->channel, response->str, response->len);
551 g_string_free(response, true);
552 if (status != G_IO_STATUS_NORMAL) {
553 return -EIO;
554 }
555
556 return 0;
557 }
558
559 /* handle requests/control events coming in over the channel */
560 static void process_event(void *opaque, QObject *obj, Error *err)
561 {
562 GAState *s = opaque;
563 QDict *rsp;
564 int ret;
565
566 g_debug("process_event: called");
567 assert(!obj != !err);
568 if (err) {
569 rsp = qmp_error_response(err);
570 goto end;
571 }
572
573 g_debug("processing command");
574 rsp = qmp_dispatch(&ga_commands, obj, false, NULL);
575
576 end:
577 ret = send_response(s, rsp);
578 if (ret < 0) {
579 g_warning("error sending error response: %s", strerror(-ret));
580 }
581 qobject_unref(rsp);
582 qobject_unref(obj);
583 }
584
585 /* false return signals GAChannel to close the current client connection */
586 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
587 {
588 GAState *s = data;
589 gchar buf[QGA_READ_COUNT_DEFAULT + 1];
590 gsize count;
591 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
592 switch (status) {
593 case G_IO_STATUS_ERROR:
594 g_warning("error reading channel");
595 stop_agent(s, false);
596 return false;
597 case G_IO_STATUS_NORMAL:
598 buf[count] = 0;
599 g_debug("read data, count: %d, data: %s", (int)count, buf);
600 json_message_parser_feed(&s->parser, (char *)buf, (int)count);
601 break;
602 case G_IO_STATUS_EOF:
603 g_debug("received EOF");
604 if (!s->virtio) {
605 return false;
606 }
607 /* fall through */
608 case G_IO_STATUS_AGAIN:
609 /* virtio causes us to spin here when no process is attached to
610 * host-side chardev. sleep a bit to mitigate this
611 */
612 if (s->virtio) {
613 usleep(100 * 1000);
614 }
615 return true;
616 default:
617 g_warning("unknown channel read status, closing");
618 return false;
619 }
620 return true;
621 }
622
623 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
624 int listen_fd)
625 {
626 GAChannelMethod channel_method;
627
628 if (strcmp(method, "virtio-serial") == 0) {
629 s->virtio = true; /* virtio requires special handling in some cases */
630 channel_method = GA_CHANNEL_VIRTIO_SERIAL;
631 } else if (strcmp(method, "isa-serial") == 0) {
632 channel_method = GA_CHANNEL_ISA_SERIAL;
633 } else if (strcmp(method, "unix-listen") == 0) {
634 channel_method = GA_CHANNEL_UNIX_LISTEN;
635 } else if (strcmp(method, "vsock-listen") == 0) {
636 channel_method = GA_CHANNEL_VSOCK_LISTEN;
637 } else {
638 g_critical("unsupported channel method/type: %s", method);
639 return false;
640 }
641
642 s->channel = ga_channel_new(channel_method, path, listen_fd,
643 channel_event_cb, s);
644 if (!s->channel) {
645 g_critical("failed to create guest agent channel");
646 return false;
647 }
648
649 return true;
650 }
651
652 #ifdef _WIN32
653 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data)
654 {
655 DWORD ret = NO_ERROR;
656 PDEV_BROADCAST_HDR broadcast_header = (PDEV_BROADCAST_HDR)data;
657
658 if (broadcast_header->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
659 switch (type) {
660 /* Device inserted */
661 case DBT_DEVICEARRIVAL:
662 /* Start QEMU-ga's service */
663 if (!SetEvent(ga_state->wakeup_event)) {
664 ret = GetLastError();
665 }
666 break;
667 /* Device removed */
668 case DBT_DEVICEQUERYREMOVE:
669 case DBT_DEVICEREMOVEPENDING:
670 case DBT_DEVICEREMOVECOMPLETE:
671 /* Stop QEMU-ga's service */
672 if (!ResetEvent(ga_state->wakeup_event)) {
673 ret = GetLastError();
674 }
675 break;
676 default:
677 ret = ERROR_CALL_NOT_IMPLEMENTED;
678 }
679 }
680 return ret;
681 }
682
683 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
684 LPVOID ctx)
685 {
686 DWORD ret = NO_ERROR;
687 GAService *service = &ga_state->service;
688
689 switch (ctrl) {
690 case SERVICE_CONTROL_STOP:
691 case SERVICE_CONTROL_SHUTDOWN:
692 quit_handler(SIGTERM);
693 SetEvent(ga_state->wakeup_event);
694 service->status.dwCurrentState = SERVICE_STOP_PENDING;
695 SetServiceStatus(service->status_handle, &service->status);
696 break;
697 case SERVICE_CONTROL_DEVICEEVENT:
698 handle_serial_device_events(type, data);
699 break;
700
701 default:
702 ret = ERROR_CALL_NOT_IMPLEMENTED;
703 }
704 return ret;
705 }
706
707 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
708 {
709 GAService *service = &ga_state->service;
710
711 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
712 service_ctrl_handler, NULL);
713
714 if (service->status_handle == 0) {
715 g_critical("Failed to register extended requests function!\n");
716 return;
717 }
718
719 service->status.dwServiceType = SERVICE_WIN32;
720 service->status.dwCurrentState = SERVICE_RUNNING;
721 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
722 service->status.dwWin32ExitCode = NO_ERROR;
723 service->status.dwServiceSpecificExitCode = NO_ERROR;
724 service->status.dwCheckPoint = 0;
725 service->status.dwWaitHint = 0;
726 DEV_BROADCAST_DEVICEINTERFACE notification_filter;
727 ZeroMemory(&notification_filter, sizeof(notification_filter));
728 notification_filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
729 notification_filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
730 notification_filter.dbcc_classguid = GUID_VIOSERIAL_PORT;
731
732 service->device_notification_handle =
733 RegisterDeviceNotification(service->status_handle,
734 &notification_filter, DEVICE_NOTIFY_SERVICE_HANDLE);
735 if (!service->device_notification_handle) {
736 g_critical("Failed to register device notification handle!\n");
737 return;
738 }
739 SetServiceStatus(service->status_handle, &service->status);
740
741 run_agent(ga_state);
742
743 UnregisterDeviceNotification(service->device_notification_handle);
744 service->status.dwCurrentState = SERVICE_STOPPED;
745 SetServiceStatus(service->status_handle, &service->status);
746 }
747 #endif
748
749 static void set_persistent_state_defaults(GAPersistentState *pstate)
750 {
751 g_assert(pstate);
752 pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
753 }
754
755 static void persistent_state_from_keyfile(GAPersistentState *pstate,
756 GKeyFile *keyfile)
757 {
758 g_assert(pstate);
759 g_assert(keyfile);
760 /* if any fields are missing, either because the file was tampered with
761 * by agents of chaos, or because the field wasn't present at the time the
762 * file was created, the best we can ever do is start over with the default
763 * values. so load them now, and ignore any errors in accessing key-value
764 * pairs
765 */
766 set_persistent_state_defaults(pstate);
767
768 if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
769 pstate->fd_counter =
770 g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
771 }
772 }
773
774 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
775 GKeyFile *keyfile)
776 {
777 g_assert(pstate);
778 g_assert(keyfile);
779
780 g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
781 }
782
783 static gboolean write_persistent_state(const GAPersistentState *pstate,
784 const gchar *path)
785 {
786 GKeyFile *keyfile = g_key_file_new();
787 GError *gerr = NULL;
788 gboolean ret = true;
789 gchar *data = NULL;
790 gsize data_len;
791
792 g_assert(pstate);
793
794 persistent_state_to_keyfile(pstate, keyfile);
795 data = g_key_file_to_data(keyfile, &data_len, &gerr);
796 if (gerr) {
797 g_critical("failed to convert persistent state to string: %s",
798 gerr->message);
799 ret = false;
800 goto out;
801 }
802
803 g_file_set_contents(path, data, data_len, &gerr);
804 if (gerr) {
805 g_critical("failed to write persistent state to %s: %s",
806 path, gerr->message);
807 ret = false;
808 goto out;
809 }
810
811 out:
812 if (gerr) {
813 g_error_free(gerr);
814 }
815 if (keyfile) {
816 g_key_file_free(keyfile);
817 }
818 g_free(data);
819 return ret;
820 }
821
822 static gboolean read_persistent_state(GAPersistentState *pstate,
823 const gchar *path, gboolean frozen)
824 {
825 GKeyFile *keyfile = NULL;
826 GError *gerr = NULL;
827 struct stat st;
828 gboolean ret = true;
829
830 g_assert(pstate);
831
832 if (stat(path, &st) == -1) {
833 /* it's okay if state file doesn't exist, but any other error
834 * indicates a permissions issue or some other misconfiguration
835 * that we likely won't be able to recover from.
836 */
837 if (errno != ENOENT) {
838 g_critical("unable to access state file at path %s: %s",
839 path, strerror(errno));
840 ret = false;
841 goto out;
842 }
843
844 /* file doesn't exist. initialize state to default values and
845 * attempt to save now. (we could wait till later when we have
846 * modified state we need to commit, but if there's a problem,
847 * such as a missing parent directory, we want to catch it now)
848 *
849 * there is a potential scenario where someone either managed to
850 * update the agent from a version that didn't use a key store
851 * while qemu-ga thought the filesystem was frozen, or
852 * deleted the key store prior to issuing a fsfreeze, prior
853 * to restarting the agent. in this case we go ahead and defer
854 * initial creation till we actually have modified state to
855 * write, otherwise fail to recover from freeze.
856 */
857 set_persistent_state_defaults(pstate);
858 if (!frozen) {
859 ret = write_persistent_state(pstate, path);
860 if (!ret) {
861 g_critical("unable to create state file at path %s", path);
862 ret = false;
863 goto out;
864 }
865 }
866 ret = true;
867 goto out;
868 }
869
870 keyfile = g_key_file_new();
871 g_key_file_load_from_file(keyfile, path, 0, &gerr);
872 if (gerr) {
873 g_critical("error loading persistent state from path: %s, %s",
874 path, gerr->message);
875 ret = false;
876 goto out;
877 }
878
879 persistent_state_from_keyfile(pstate, keyfile);
880
881 out:
882 if (keyfile) {
883 g_key_file_free(keyfile);
884 }
885 if (gerr) {
886 g_error_free(gerr);
887 }
888
889 return ret;
890 }
891
892 int64_t ga_get_fd_handle(GAState *s, Error **errp)
893 {
894 int64_t handle;
895
896 g_assert(s->pstate_filepath);
897 /* we blacklist commands and avoid operations that potentially require
898 * writing to disk when we're in a frozen state. this includes opening
899 * new files, so we should never get here in that situation
900 */
901 g_assert(!ga_is_frozen(s));
902
903 handle = s->pstate.fd_counter++;
904
905 /* This should never happen on a reasonable timeframe, as guest-file-open
906 * would have to be issued 2^63 times */
907 if (s->pstate.fd_counter == INT64_MAX) {
908 abort();
909 }
910
911 if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
912 error_setg(errp, "failed to commit persistent state to disk");
913 return -1;
914 }
915
916 return handle;
917 }
918
919 static void ga_print_cmd(const QmpCommand *cmd, void *opaque)
920 {
921 printf("%s\n", qmp_command_name(cmd));
922 }
923
924 static GList *split_list(const gchar *str, const gchar *delim)
925 {
926 GList *list = NULL;
927 int i;
928 gchar **strv;
929
930 strv = g_strsplit(str, delim, -1);
931 for (i = 0; strv[i]; i++) {
932 list = g_list_prepend(list, strv[i]);
933 }
934 g_free(strv);
935
936 return list;
937 }
938
939 struct GAConfig {
940 char *channel_path;
941 char *method;
942 char *log_filepath;
943 char *pid_filepath;
944 #ifdef CONFIG_FSFREEZE
945 char *fsfreeze_hook;
946 #endif
947 char *state_dir;
948 #ifdef _WIN32
949 const char *service;
950 #endif
951 gchar *bliststr; /* blacklist may point to this string */
952 GList *blacklist;
953 int daemonize;
954 GLogLevelFlags log_level;
955 int dumpconf;
956 bool retry_path;
957 };
958
959 static void config_load(GAConfig *config)
960 {
961 GError *gerr = NULL;
962 GKeyFile *keyfile;
963 g_autofree char *conf = g_strdup(g_getenv("QGA_CONF")) ?: get_relocated_path(QGA_CONF_DEFAULT);
964
965 /* read system config */
966 keyfile = g_key_file_new();
967 if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
968 goto end;
969 }
970 if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
971 config->daemonize =
972 g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
973 }
974 if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
975 config->method =
976 g_key_file_get_string(keyfile, "general", "method", &gerr);
977 }
978 if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
979 config->channel_path =
980 g_key_file_get_string(keyfile, "general", "path", &gerr);
981 }
982 if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
983 config->log_filepath =
984 g_key_file_get_string(keyfile, "general", "logfile", &gerr);
985 }
986 if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
987 config->pid_filepath =
988 g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
989 }
990 #ifdef CONFIG_FSFREEZE
991 if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
992 config->fsfreeze_hook =
993 g_key_file_get_string(keyfile,
994 "general", "fsfreeze-hook", &gerr);
995 }
996 #endif
997 if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
998 config->state_dir =
999 g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1000 }
1001 if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1002 g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1003 /* enable all log levels */
1004 config->log_level = G_LOG_LEVEL_MASK;
1005 }
1006 if (g_key_file_has_key(keyfile, "general", "retry-path", NULL)) {
1007 config->retry_path =
1008 g_key_file_get_boolean(keyfile, "general", "retry-path", &gerr);
1009 }
1010 if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
1011 config->bliststr =
1012 g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1013 config->blacklist = g_list_concat(config->blacklist,
1014 split_list(config->bliststr, ","));
1015 }
1016
1017 end:
1018 g_key_file_free(keyfile);
1019 if (gerr &&
1020 !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1021 g_critical("error loading configuration from path: %s, %s",
1022 conf, gerr->message);
1023 exit(EXIT_FAILURE);
1024 }
1025 g_clear_error(&gerr);
1026 }
1027
1028 static gchar *list_join(GList *list, const gchar separator)
1029 {
1030 GString *str = g_string_new("");
1031
1032 while (list) {
1033 str = g_string_append(str, (gchar *)list->data);
1034 list = g_list_next(list);
1035 if (list) {
1036 str = g_string_append_c(str, separator);
1037 }
1038 }
1039
1040 return g_string_free(str, FALSE);
1041 }
1042
1043 static void config_dump(GAConfig *config)
1044 {
1045 GError *error = NULL;
1046 GKeyFile *keyfile;
1047 gchar *tmp;
1048
1049 keyfile = g_key_file_new();
1050 g_assert(keyfile);
1051
1052 g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1053 g_key_file_set_string(keyfile, "general", "method", config->method);
1054 if (config->channel_path) {
1055 g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1056 }
1057 if (config->log_filepath) {
1058 g_key_file_set_string(keyfile, "general", "logfile",
1059 config->log_filepath);
1060 }
1061 g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1062 #ifdef CONFIG_FSFREEZE
1063 if (config->fsfreeze_hook) {
1064 g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1065 config->fsfreeze_hook);
1066 }
1067 #endif
1068 g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1069 g_key_file_set_boolean(keyfile, "general", "verbose",
1070 config->log_level == G_LOG_LEVEL_MASK);
1071 g_key_file_set_boolean(keyfile, "general", "retry-path",
1072 config->retry_path);
1073 tmp = list_join(config->blacklist, ',');
1074 g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1075 g_free(tmp);
1076
1077 tmp = g_key_file_to_data(keyfile, NULL, &error);
1078 if (error) {
1079 g_critical("Failed to dump keyfile: %s", error->message);
1080 g_clear_error(&error);
1081 } else {
1082 printf("%s", tmp);
1083 }
1084
1085 g_free(tmp);
1086 g_key_file_free(keyfile);
1087 }
1088
1089 static void config_parse(GAConfig *config, int argc, char **argv)
1090 {
1091 const char *sopt = "hVvdm:p:l:f:F::b:s:t:Dr";
1092 int opt_ind = 0, ch;
1093 const struct option lopt[] = {
1094 { "help", 0, NULL, 'h' },
1095 { "version", 0, NULL, 'V' },
1096 { "dump-conf", 0, NULL, 'D' },
1097 { "logfile", 1, NULL, 'l' },
1098 { "pidfile", 1, NULL, 'f' },
1099 #ifdef CONFIG_FSFREEZE
1100 { "fsfreeze-hook", 2, NULL, 'F' },
1101 #endif
1102 { "verbose", 0, NULL, 'v' },
1103 { "method", 1, NULL, 'm' },
1104 { "path", 1, NULL, 'p' },
1105 { "daemonize", 0, NULL, 'd' },
1106 { "blacklist", 1, NULL, 'b' },
1107 #ifdef _WIN32
1108 { "service", 1, NULL, 's' },
1109 #endif
1110 { "statedir", 1, NULL, 't' },
1111 { "retry-path", 0, NULL, 'r' },
1112 { NULL, 0, NULL, 0 }
1113 };
1114
1115 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1116 switch (ch) {
1117 case 'm':
1118 g_free(config->method);
1119 config->method = g_strdup(optarg);
1120 break;
1121 case 'p':
1122 g_free(config->channel_path);
1123 config->channel_path = g_strdup(optarg);
1124 break;
1125 case 'l':
1126 g_free(config->log_filepath);
1127 config->log_filepath = g_strdup(optarg);
1128 break;
1129 case 'f':
1130 g_free(config->pid_filepath);
1131 config->pid_filepath = g_strdup(optarg);
1132 break;
1133 #ifdef CONFIG_FSFREEZE
1134 case 'F':
1135 g_free(config->fsfreeze_hook);
1136 config->fsfreeze_hook = optarg ? g_strdup(optarg) : get_relocated_path(QGA_FSFREEZE_HOOK_DEFAULT);
1137 break;
1138 #endif
1139 case 't':
1140 g_free(config->state_dir);
1141 config->state_dir = g_strdup(optarg);
1142 break;
1143 case 'v':
1144 /* enable all log levels */
1145 config->log_level = G_LOG_LEVEL_MASK;
1146 break;
1147 case 'V':
1148 printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1149 exit(EXIT_SUCCESS);
1150 case 'd':
1151 config->daemonize = 1;
1152 break;
1153 case 'D':
1154 config->dumpconf = 1;
1155 break;
1156 case 'r':
1157 config->retry_path = true;
1158 break;
1159 case 'b': {
1160 if (is_help_option(optarg)) {
1161 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1162 exit(EXIT_SUCCESS);
1163 }
1164 config->blacklist = g_list_concat(config->blacklist,
1165 split_list(optarg, ","));
1166 break;
1167 }
1168 #ifdef _WIN32
1169 case 's':
1170 config->service = optarg;
1171 if (strcmp(config->service, "install") == 0) {
1172 if (ga_install_vss_provider()) {
1173 exit(EXIT_FAILURE);
1174 }
1175 if (ga_install_service(config->channel_path,
1176 config->log_filepath, config->state_dir)) {
1177 exit(EXIT_FAILURE);
1178 }
1179 exit(EXIT_SUCCESS);
1180 } else if (strcmp(config->service, "uninstall") == 0) {
1181 ga_uninstall_vss_provider();
1182 exit(ga_uninstall_service());
1183 } else if (strcmp(config->service, "vss-install") == 0) {
1184 if (ga_install_vss_provider()) {
1185 exit(EXIT_FAILURE);
1186 }
1187 exit(EXIT_SUCCESS);
1188 } else if (strcmp(config->service, "vss-uninstall") == 0) {
1189 ga_uninstall_vss_provider();
1190 exit(EXIT_SUCCESS);
1191 } else {
1192 printf("Unknown service command.\n");
1193 exit(EXIT_FAILURE);
1194 }
1195 break;
1196 #endif
1197 case 'h':
1198 usage(argv[0]);
1199 exit(EXIT_SUCCESS);
1200 case '?':
1201 g_print("Unknown option, try '%s --help' for more information.\n",
1202 argv[0]);
1203 exit(EXIT_FAILURE);
1204 }
1205 }
1206 }
1207
1208 static void config_free(GAConfig *config)
1209 {
1210 g_free(config->method);
1211 g_free(config->log_filepath);
1212 g_free(config->pid_filepath);
1213 g_free(config->state_dir);
1214 g_free(config->channel_path);
1215 g_free(config->bliststr);
1216 #ifdef CONFIG_FSFREEZE
1217 g_free(config->fsfreeze_hook);
1218 #endif
1219 g_list_free_full(config->blacklist, g_free);
1220 g_free(config);
1221 }
1222
1223 static bool check_is_frozen(GAState *s)
1224 {
1225 #ifndef _WIN32
1226 /* check if a previous instance of qemu-ga exited with filesystems' state
1227 * marked as frozen. this could be a stale value (a non-qemu-ga process
1228 * or reboot may have since unfrozen them), but better to require an
1229 * uneeded unfreeze than to risk hanging on start-up
1230 */
1231 struct stat st;
1232 if (stat(s->state_filepath_isfrozen, &st) == -1) {
1233 /* it's okay if the file doesn't exist, but if we can't access for
1234 * some other reason, such as permissions, there's a configuration
1235 * that needs to be addressed. so just bail now before we get into
1236 * more trouble later
1237 */
1238 if (errno != ENOENT) {
1239 g_critical("unable to access state file at path %s: %s",
1240 s->state_filepath_isfrozen, strerror(errno));
1241 return EXIT_FAILURE;
1242 }
1243 } else {
1244 g_warning("previous instance appears to have exited with frozen"
1245 " filesystems. deferring logging/pidfile creation and"
1246 " disabling non-fsfreeze-safe commands until"
1247 " guest-fsfreeze-thaw is issued, or filesystems are"
1248 " manually unfrozen and the file %s is removed",
1249 s->state_filepath_isfrozen);
1250 return true;
1251 }
1252 #endif
1253 return false;
1254 }
1255
1256 static GAState *initialize_agent(GAConfig *config, int socket_activation)
1257 {
1258 GAState *s = g_new0(GAState, 1);
1259
1260 g_assert(ga_state == NULL);
1261
1262 s->log_level = config->log_level;
1263 s->log_file = stderr;
1264 #ifdef CONFIG_FSFREEZE
1265 s->fsfreeze_hook = config->fsfreeze_hook;
1266 #endif
1267 s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1268 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1269 config->state_dir);
1270 s->frozen = check_is_frozen(s);
1271
1272 g_log_set_default_handler(ga_log, s);
1273 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1274 ga_enable_logging(s);
1275
1276 #ifdef _WIN32
1277 /* On win32 the state directory is application specific (be it the default
1278 * or a user override). We got past the command line parsing; let's create
1279 * the directory (with any intermediate directories). If we run into an
1280 * error later on, we won't try to clean up the directory, it is considered
1281 * persistent.
1282 */
1283 if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1284 g_critical("unable to create (an ancestor of) the state directory"
1285 " '%s': %s", config->state_dir, strerror(errno));
1286 return NULL;
1287 }
1288 #endif
1289
1290 if (ga_is_frozen(s)) {
1291 if (config->daemonize) {
1292 /* delay opening/locking of pidfile till filesystems are unfrozen */
1293 s->deferred_options.pid_filepath = config->pid_filepath;
1294 become_daemon(NULL);
1295 }
1296 if (config->log_filepath) {
1297 /* delay opening the log file till filesystems are unfrozen */
1298 s->deferred_options.log_filepath = config->log_filepath;
1299 }
1300 ga_disable_logging(s);
1301 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1302 } else {
1303 if (config->daemonize) {
1304 become_daemon(config->pid_filepath);
1305 }
1306 if (config->log_filepath) {
1307 FILE *log_file = ga_open_logfile(config->log_filepath);
1308 if (!log_file) {
1309 g_critical("unable to open specified log file: %s",
1310 strerror(errno));
1311 return NULL;
1312 }
1313 s->log_file = log_file;
1314 }
1315 }
1316
1317 /* load persistent state from disk */
1318 if (!read_persistent_state(&s->pstate,
1319 s->pstate_filepath,
1320 ga_is_frozen(s))) {
1321 g_critical("failed to load persistent state");
1322 return NULL;
1323 }
1324
1325 config->blacklist = ga_command_blacklist_init(config->blacklist);
1326 if (config->blacklist) {
1327 GList *l = config->blacklist;
1328 s->blacklist = config->blacklist;
1329 do {
1330 g_debug("disabling command: %s", (char *)l->data);
1331 qmp_disable_command(&ga_commands, l->data, NULL);
1332 l = g_list_next(l);
1333 } while (l);
1334 }
1335 s->command_state = ga_command_state_new();
1336 ga_command_state_init(s, s->command_state);
1337 ga_command_state_init_all(s->command_state);
1338 json_message_parser_init(&s->parser, process_event, s, NULL);
1339
1340 #ifndef _WIN32
1341 if (!register_signal_handlers()) {
1342 g_critical("failed to register signal handlers");
1343 return NULL;
1344 }
1345 #endif
1346
1347 s->main_loop = g_main_loop_new(NULL, false);
1348
1349 s->config = config;
1350 s->socket_activation = socket_activation;
1351
1352 #ifdef _WIN32
1353 s->wakeup_event = CreateEvent(NULL, TRUE, FALSE, TEXT("WakeUp"));
1354 if (s->wakeup_event == NULL) {
1355 g_critical("CreateEvent failed");
1356 return NULL;
1357 }
1358 #endif
1359
1360 ga_state = s;
1361 return s;
1362 }
1363
1364 static void cleanup_agent(GAState *s)
1365 {
1366 #ifdef _WIN32
1367 CloseHandle(s->wakeup_event);
1368 #endif
1369 if (s->command_state) {
1370 ga_command_state_cleanup_all(s->command_state);
1371 ga_command_state_free(s->command_state);
1372 json_message_parser_destroy(&s->parser);
1373 }
1374 g_free(s->pstate_filepath);
1375 g_free(s->state_filepath_isfrozen);
1376 if (s->main_loop) {
1377 g_main_loop_unref(s->main_loop);
1378 }
1379 g_free(s);
1380 ga_state = NULL;
1381 }
1382
1383 static int run_agent_once(GAState *s)
1384 {
1385 if (!channel_init(s, s->config->method, s->config->channel_path,
1386 s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1387 g_critical("failed to initialize guest agent channel");
1388 return EXIT_FAILURE;
1389 }
1390
1391 g_main_loop_run(ga_state->main_loop);
1392
1393 if (s->channel) {
1394 ga_channel_free(s->channel);
1395 }
1396
1397 return EXIT_SUCCESS;
1398 }
1399
1400 static void wait_for_channel_availability(GAState *s)
1401 {
1402 g_warning("waiting for channel path...");
1403 #ifndef _WIN32
1404 sleep(QGA_RETRY_INTERVAL);
1405 #else
1406 DWORD dwWaitResult;
1407
1408 dwWaitResult = WaitForSingleObject(s->wakeup_event, INFINITE);
1409
1410 switch (dwWaitResult) {
1411 case WAIT_OBJECT_0:
1412 break;
1413 case WAIT_TIMEOUT:
1414 break;
1415 default:
1416 g_critical("WaitForSingleObject failed");
1417 }
1418 #endif
1419 }
1420
1421 static int run_agent(GAState *s)
1422 {
1423 int ret = EXIT_SUCCESS;
1424
1425 s->force_exit = false;
1426
1427 do {
1428 ret = run_agent_once(s);
1429 if (s->config->retry_path && !s->force_exit) {
1430 g_warning("agent stopped unexpectedly, restarting...");
1431 wait_for_channel_availability(s);
1432 }
1433 } while (s->config->retry_path && !s->force_exit);
1434
1435 return ret;
1436 }
1437
1438 static void stop_agent(GAState *s, bool requested)
1439 {
1440 if (!s->force_exit) {
1441 s->force_exit = requested;
1442 }
1443
1444 if (g_main_loop_is_running(s->main_loop)) {
1445 g_main_loop_quit(s->main_loop);
1446 }
1447 }
1448
1449 int main(int argc, char **argv)
1450 {
1451 int ret = EXIT_SUCCESS;
1452 GAState *s;
1453 GAConfig *config = g_new0(GAConfig, 1);
1454 int socket_activation;
1455
1456 config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1457
1458 qemu_init_exec_dir(argv[0]);
1459 qga_qmp_init_marshal(&ga_commands);
1460
1461 init_dfl_pathnames();
1462 config_load(config);
1463 config_parse(config, argc, argv);
1464
1465 if (config->pid_filepath == NULL) {
1466 config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1467 }
1468
1469 if (config->state_dir == NULL) {
1470 config->state_dir = g_strdup(dfl_pathnames.state_dir);
1471 }
1472
1473 if (config->method == NULL) {
1474 config->method = g_strdup("virtio-serial");
1475 }
1476
1477 socket_activation = check_socket_activation();
1478 if (socket_activation > 1) {
1479 g_critical("qemu-ga only supports listening on one socket");
1480 ret = EXIT_FAILURE;
1481 goto end;
1482 }
1483 if (socket_activation) {
1484 SocketAddress *addr;
1485
1486 g_free(config->method);
1487 g_free(config->channel_path);
1488 config->method = NULL;
1489 config->channel_path = NULL;
1490
1491 addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1492 if (addr) {
1493 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1494 config->method = g_strdup("unix-listen");
1495 } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1496 config->method = g_strdup("vsock-listen");
1497 }
1498
1499 qapi_free_SocketAddress(addr);
1500 }
1501
1502 if (!config->method) {
1503 g_critical("unsupported listen fd type");
1504 ret = EXIT_FAILURE;
1505 goto end;
1506 }
1507 } else if (config->channel_path == NULL) {
1508 if (strcmp(config->method, "virtio-serial") == 0) {
1509 /* try the default path for the virtio-serial port */
1510 config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1511 } else if (strcmp(config->method, "isa-serial") == 0) {
1512 /* try the default path for the serial port - COM1 */
1513 config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1514 } else {
1515 g_critical("must specify a path for this channel");
1516 ret = EXIT_FAILURE;
1517 goto end;
1518 }
1519 }
1520
1521 if (config->dumpconf) {
1522 config_dump(config);
1523 goto end;
1524 }
1525
1526 s = initialize_agent(config, socket_activation);
1527 if (!s) {
1528 g_critical("error initializing guest agent");
1529 goto end;
1530 }
1531
1532 #ifdef _WIN32
1533 if (config->daemonize) {
1534 SERVICE_TABLE_ENTRY service_table[] = {
1535 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1536 StartServiceCtrlDispatcher(service_table);
1537 } else {
1538 ret = run_agent(s);
1539 }
1540 #else
1541 ret = run_agent(s);
1542 #endif
1543
1544 cleanup_agent(s);
1545
1546 end:
1547 if (config->daemonize) {
1548 unlink(config->pid_filepath);
1549 }
1550
1551 config_free(config);
1552
1553 return ret;
1554 }