Merge remote-tracking branch 'remotes/elmarco/tags/libslirp-pull-request' 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 "qapi/qmp/qstring.h"
26 #include "guest-agent-core.h"
27 #include "qga-qapi-init-commands.h"
28 #include "qapi/qmp/qerror.h"
29 #include "qapi/error.h"
30 #include "channel.h"
31 #include "qemu/bswap.h"
32 #include "qemu/cutils.h"
33 #include "qemu/help_option.h"
34 #include "qemu/sockets.h"
35 #include "qemu/systemd.h"
36 #include "qemu-version.h"
37 #ifdef _WIN32
38 #include <dbt.h>
39 #include "qga/service-win32.h"
40 #include "qga/vss-win32.h"
41 #endif
42 #ifdef __linux__
43 #include <linux/fs.h>
44 #ifdef FIFREEZE
45 #define CONFIG_FSFREEZE
46 #endif
47 #endif
48
49 #ifndef _WIN32
50 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
51 #define QGA_STATE_RELATIVE_DIR "run"
52 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
53 #else
54 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
55 #define QGA_STATE_RELATIVE_DIR "qemu-ga"
56 #define QGA_SERIAL_PATH_DEFAULT "COM1"
57 #endif
58 #ifdef CONFIG_FSFREEZE
59 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
60 #endif
61 #define QGA_SENTINEL_BYTE 0xFF
62 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
63 #define QGA_RETRY_INTERVAL 5
64
65 static struct {
66 const char *state_dir;
67 const char *pidfile;
68 } dfl_pathnames;
69
70 typedef struct GAPersistentState {
71 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
72 int64_t fd_counter;
73 } GAPersistentState;
74
75 typedef struct GAConfig GAConfig;
76
77 struct GAState {
78 JSONMessageParser parser;
79 GMainLoop *main_loop;
80 GAChannel *channel;
81 bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
82 GACommandState *command_state;
83 GLogLevelFlags log_level;
84 FILE *log_file;
85 bool logging_enabled;
86 #ifdef _WIN32
87 GAService service;
88 HANDLE wakeup_event;
89 #endif
90 bool delimit_response;
91 bool frozen;
92 GList *blacklist;
93 char *state_filepath_isfrozen;
94 struct {
95 const char *log_filepath;
96 const char *pid_filepath;
97 } deferred_options;
98 #ifdef CONFIG_FSFREEZE
99 const char *fsfreeze_hook;
100 #endif
101 gchar *pstate_filepath;
102 GAPersistentState pstate;
103 GAConfig *config;
104 int socket_activation;
105 bool force_exit;
106 };
107
108 struct GAState *ga_state;
109 QmpCommandList ga_commands;
110
111 /* commands that are safe to issue while filesystems are frozen */
112 static const char *ga_freeze_whitelist[] = {
113 "guest-ping",
114 "guest-info",
115 "guest-sync",
116 "guest-sync-delimited",
117 "guest-fsfreeze-status",
118 "guest-fsfreeze-thaw",
119 NULL
120 };
121
122 #ifdef _WIN32
123 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
124 LPVOID ctx);
125 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data);
126 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
127 #endif
128 static int run_agent(GAState *s);
129 static void stop_agent(GAState *s, bool requested);
130
131 static void
132 init_dfl_pathnames(void)
133 {
134 g_assert(dfl_pathnames.state_dir == NULL);
135 g_assert(dfl_pathnames.pidfile == NULL);
136 dfl_pathnames.state_dir = qemu_get_local_state_pathname(
137 QGA_STATE_RELATIVE_DIR);
138 dfl_pathnames.pidfile = qemu_get_local_state_pathname(
139 QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
140 }
141
142 static void quit_handler(int sig)
143 {
144 /* if we're frozen, don't exit unless we're absolutely forced to,
145 * because it's basically impossible for graceful exit to complete
146 * unless all log/pid files are on unfreezable filesystems. there's
147 * also a very likely chance killing the agent before unfreezing
148 * the filesystems is a mistake (or will be viewed as one later).
149 * On Windows the freeze interval is limited to 10 seconds, so
150 * we should quit, but first we should wait for the timeout, thaw
151 * the filesystem and quit.
152 */
153 if (ga_is_frozen(ga_state)) {
154 #ifdef _WIN32
155 int i = 0;
156 Error *err = NULL;
157 HANDLE hEventTimeout;
158
159 g_debug("Thawing filesystems before exiting");
160
161 hEventTimeout = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_TIMEOUT);
162 if (hEventTimeout) {
163 WaitForSingleObject(hEventTimeout, 0);
164 CloseHandle(hEventTimeout);
165 }
166 qga_vss_fsfreeze(&i, false, NULL, &err);
167 if (err) {
168 g_debug("Error unfreezing filesystems prior to exiting: %s",
169 error_get_pretty(err));
170 error_free(err);
171 }
172 #else
173 return;
174 #endif
175 }
176 g_debug("received signal num %d, quitting", sig);
177
178 stop_agent(ga_state, true);
179 }
180
181 #ifndef _WIN32
182 static gboolean register_signal_handlers(void)
183 {
184 struct sigaction sigact;
185 int ret;
186
187 memset(&sigact, 0, sizeof(struct sigaction));
188 sigact.sa_handler = quit_handler;
189
190 ret = sigaction(SIGINT, &sigact, NULL);
191 if (ret == -1) {
192 g_error("error configuring signal handler: %s", strerror(errno));
193 }
194 ret = sigaction(SIGTERM, &sigact, NULL);
195 if (ret == -1) {
196 g_error("error configuring signal handler: %s", strerror(errno));
197 }
198
199 sigact.sa_handler = SIG_IGN;
200 if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
201 g_error("error configuring SIGPIPE signal handler: %s",
202 strerror(errno));
203 }
204
205 return true;
206 }
207
208 /* TODO: use this in place of all post-fork() fclose(std*) callers */
209 void reopen_fd_to_null(int fd)
210 {
211 int nullfd;
212
213 nullfd = open("/dev/null", O_RDWR);
214 if (nullfd < 0) {
215 return;
216 }
217
218 dup2(nullfd, fd);
219
220 if (nullfd != fd) {
221 close(nullfd);
222 }
223 }
224 #endif
225
226 static void usage(const char *cmd)
227 {
228 printf(
229 "Usage: %s [-m <method> -p <path>] [<options>]\n"
230 "QEMU Guest Agent " QEMU_FULL_VERSION "\n"
231 QEMU_COPYRIGHT "\n"
232 "\n"
233 " -m, --method transport method: one of unix-listen, virtio-serial,\n"
234 " isa-serial, or vsock-listen (virtio-serial is the default)\n"
235 " -p, --path device/socket path (the default for virtio-serial is:\n"
236 " %s,\n"
237 " the default for isa-serial is:\n"
238 " %s).\n"
239 " Socket addresses for vsock-listen are written as\n"
240 " <cid>:<port>.\n"
241 " -l, --logfile set logfile path, logs to stderr by default\n"
242 " -f, --pidfile specify pidfile (default is %s)\n"
243 #ifdef CONFIG_FSFREEZE
244 " -F, --fsfreeze-hook\n"
245 " enable fsfreeze hook. Accepts an optional argument that\n"
246 " specifies script to run on freeze/thaw. Script will be\n"
247 " called with 'freeze'/'thaw' arguments accordingly.\n"
248 " (default is %s)\n"
249 " If using -F with an argument, do not follow -F with a\n"
250 " space.\n"
251 " (for example: -F/var/run/fsfreezehook.sh)\n"
252 #endif
253 " -t, --statedir specify dir to store state information (absolute paths\n"
254 " only, default is %s)\n"
255 " -v, --verbose log extra debugging information\n"
256 " -V, --version print version information and exit\n"
257 " -d, --daemonize become a daemon\n"
258 #ifdef _WIN32
259 " -s, --service service commands: install, uninstall, vss-install, vss-uninstall\n"
260 #endif
261 " -b, --blacklist comma-separated list of RPCs to disable (no spaces, \"?\"\n"
262 " to list available RPCs)\n"
263 " -D, --dump-conf dump a qemu-ga config file based on current config\n"
264 " options / command-line parameters to stdout\n"
265 " -r, --retry-path attempt re-opening path if it's unavailable or closed\n"
266 " due to an error which may be recoverable in the future\n"
267 " (virtio-serial driver re-install, serial device hot\n"
268 " plug/unplug, etc.)\n"
269 " -h, --help display this help and exit\n"
270 "\n"
271 QEMU_HELP_BOTTOM "\n"
272 , cmd, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
273 dfl_pathnames.pidfile,
274 #ifdef CONFIG_FSFREEZE
275 QGA_FSFREEZE_HOOK_DEFAULT,
276 #endif
277 dfl_pathnames.state_dir);
278 }
279
280 static const char *ga_log_level_str(GLogLevelFlags level)
281 {
282 switch (level & G_LOG_LEVEL_MASK) {
283 case G_LOG_LEVEL_ERROR:
284 return "error";
285 case G_LOG_LEVEL_CRITICAL:
286 return "critical";
287 case G_LOG_LEVEL_WARNING:
288 return "warning";
289 case G_LOG_LEVEL_MESSAGE:
290 return "message";
291 case G_LOG_LEVEL_INFO:
292 return "info";
293 case G_LOG_LEVEL_DEBUG:
294 return "debug";
295 default:
296 return "user";
297 }
298 }
299
300 bool ga_logging_enabled(GAState *s)
301 {
302 return s->logging_enabled;
303 }
304
305 void ga_disable_logging(GAState *s)
306 {
307 s->logging_enabled = false;
308 }
309
310 void ga_enable_logging(GAState *s)
311 {
312 s->logging_enabled = true;
313 }
314
315 static void ga_log(const gchar *domain, GLogLevelFlags level,
316 const gchar *msg, gpointer opaque)
317 {
318 GAState *s = opaque;
319 GTimeVal time;
320 const char *level_str = ga_log_level_str(level);
321
322 if (!ga_logging_enabled(s)) {
323 return;
324 }
325
326 level &= G_LOG_LEVEL_MASK;
327 #ifndef _WIN32
328 if (g_strcmp0(domain, "syslog") == 0) {
329 syslog(LOG_INFO, "%s: %s", level_str, msg);
330 } else if (level & s->log_level) {
331 #else
332 if (level & s->log_level) {
333 #endif
334 g_get_current_time(&time);
335 fprintf(s->log_file,
336 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
337 fflush(s->log_file);
338 }
339 }
340
341 void ga_set_response_delimited(GAState *s)
342 {
343 s->delimit_response = true;
344 }
345
346 static FILE *ga_open_logfile(const char *logfile)
347 {
348 FILE *f;
349
350 f = fopen(logfile, "a");
351 if (!f) {
352 return NULL;
353 }
354
355 qemu_set_cloexec(fileno(f));
356 return f;
357 }
358
359 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
360 {
361 return strcmp(str1, str2);
362 }
363
364 /* disable commands that aren't safe for fsfreeze */
365 static void ga_disable_non_whitelisted(const QmpCommand *cmd, void *opaque)
366 {
367 bool whitelisted = false;
368 int i = 0;
369 const char *name = qmp_command_name(cmd);
370
371 while (ga_freeze_whitelist[i] != NULL) {
372 if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
373 whitelisted = true;
374 }
375 i++;
376 }
377 if (!whitelisted) {
378 g_debug("disabling command: %s", name);
379 qmp_disable_command(&ga_commands, name);
380 }
381 }
382
383 /* [re-]enable all commands, except those explicitly blacklisted by user */
384 static void ga_enable_non_blacklisted(const QmpCommand *cmd, void *opaque)
385 {
386 GList *blacklist = opaque;
387 const char *name = qmp_command_name(cmd);
388
389 if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
390 !qmp_command_is_enabled(cmd)) {
391 g_debug("enabling command: %s", name);
392 qmp_enable_command(&ga_commands, name);
393 }
394 }
395
396 static bool ga_create_file(const char *path)
397 {
398 int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
399 if (fd == -1) {
400 g_warning("unable to open/create file %s: %s", path, strerror(errno));
401 return false;
402 }
403 close(fd);
404 return true;
405 }
406
407 static bool ga_delete_file(const char *path)
408 {
409 int ret = unlink(path);
410 if (ret == -1) {
411 g_warning("unable to delete file: %s: %s", path, strerror(errno));
412 return false;
413 }
414
415 return true;
416 }
417
418 bool ga_is_frozen(GAState *s)
419 {
420 return s->frozen;
421 }
422
423 void ga_set_frozen(GAState *s)
424 {
425 if (ga_is_frozen(s)) {
426 return;
427 }
428 /* disable all non-whitelisted (for frozen state) commands */
429 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
430 g_warning("disabling logging due to filesystem freeze");
431 ga_disable_logging(s);
432 s->frozen = true;
433 if (!ga_create_file(s->state_filepath_isfrozen)) {
434 g_warning("unable to create %s, fsfreeze may not function properly",
435 s->state_filepath_isfrozen);
436 }
437 }
438
439 void ga_unset_frozen(GAState *s)
440 {
441 if (!ga_is_frozen(s)) {
442 return;
443 }
444
445 /* if we delayed creation/opening of pid/log files due to being
446 * in a frozen state at start up, do it now
447 */
448 if (s->deferred_options.log_filepath) {
449 s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
450 if (!s->log_file) {
451 s->log_file = stderr;
452 }
453 s->deferred_options.log_filepath = NULL;
454 }
455 ga_enable_logging(s);
456 g_warning("logging re-enabled due to filesystem unfreeze");
457 if (s->deferred_options.pid_filepath) {
458 Error *err = NULL;
459
460 if (!qemu_write_pidfile(s->deferred_options.pid_filepath, &err)) {
461 g_warning("%s", error_get_pretty(err));
462 error_free(err);
463 }
464 s->deferred_options.pid_filepath = NULL;
465 }
466
467 /* enable all disabled, non-blacklisted commands */
468 qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
469 s->frozen = false;
470 if (!ga_delete_file(s->state_filepath_isfrozen)) {
471 g_warning("unable to delete %s, fsfreeze may not function properly",
472 s->state_filepath_isfrozen);
473 }
474 }
475
476 #ifdef CONFIG_FSFREEZE
477 const char *ga_fsfreeze_hook(GAState *s)
478 {
479 return s->fsfreeze_hook;
480 }
481 #endif
482
483 static void become_daemon(const char *pidfile)
484 {
485 #ifndef _WIN32
486 pid_t pid, sid;
487
488 pid = fork();
489 if (pid < 0) {
490 exit(EXIT_FAILURE);
491 }
492 if (pid > 0) {
493 exit(EXIT_SUCCESS);
494 }
495
496 if (pidfile) {
497 Error *err = NULL;
498
499 if (!qemu_write_pidfile(pidfile, &err)) {
500 g_critical("%s", error_get_pretty(err));
501 error_free(err);
502 exit(EXIT_FAILURE);
503 }
504 }
505
506 umask(S_IRWXG | S_IRWXO);
507 sid = setsid();
508 if (sid < 0) {
509 goto fail;
510 }
511 if ((chdir("/")) < 0) {
512 goto fail;
513 }
514
515 reopen_fd_to_null(STDIN_FILENO);
516 reopen_fd_to_null(STDOUT_FILENO);
517 reopen_fd_to_null(STDERR_FILENO);
518 return;
519
520 fail:
521 if (pidfile) {
522 unlink(pidfile);
523 }
524 g_critical("failed to daemonize");
525 exit(EXIT_FAILURE);
526 #endif
527 }
528
529 static int send_response(GAState *s, const QDict *rsp)
530 {
531 const char *buf;
532 QString *payload_qstr, *response_qstr;
533 GIOStatus status;
534
535 g_assert(s->channel);
536
537 if (!rsp) {
538 return 0;
539 }
540
541 payload_qstr = qobject_to_json(QOBJECT(rsp));
542 if (!payload_qstr) {
543 return -EINVAL;
544 }
545
546 if (s->delimit_response) {
547 s->delimit_response = false;
548 response_qstr = qstring_new();
549 qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
550 qstring_append(response_qstr, qstring_get_str(payload_qstr));
551 qobject_unref(payload_qstr);
552 } else {
553 response_qstr = payload_qstr;
554 }
555
556 qstring_append_chr(response_qstr, '\n');
557 buf = qstring_get_str(response_qstr);
558 status = ga_channel_write_all(s->channel, buf, strlen(buf));
559 qobject_unref(response_qstr);
560 if (status != G_IO_STATUS_NORMAL) {
561 return -EIO;
562 }
563
564 return 0;
565 }
566
567 /* handle requests/control events coming in over the channel */
568 static void process_event(void *opaque, QObject *obj, Error *err)
569 {
570 GAState *s = opaque;
571 QDict *rsp;
572 int ret;
573
574 g_debug("process_event: called");
575 assert(!obj != !err);
576 if (err) {
577 rsp = qmp_error_response(err);
578 goto end;
579 }
580
581 g_debug("processing command");
582 rsp = qmp_dispatch(&ga_commands, obj, false, NULL);
583
584 end:
585 ret = send_response(s, rsp);
586 if (ret < 0) {
587 g_warning("error sending error response: %s", strerror(-ret));
588 }
589 qobject_unref(rsp);
590 qobject_unref(obj);
591 }
592
593 /* false return signals GAChannel to close the current client connection */
594 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
595 {
596 GAState *s = data;
597 gchar buf[QGA_READ_COUNT_DEFAULT+1];
598 gsize count;
599 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
600 switch (status) {
601 case G_IO_STATUS_ERROR:
602 g_warning("error reading channel");
603 stop_agent(s, false);
604 return false;
605 case G_IO_STATUS_NORMAL:
606 buf[count] = 0;
607 g_debug("read data, count: %d, data: %s", (int)count, buf);
608 json_message_parser_feed(&s->parser, (char *)buf, (int)count);
609 break;
610 case G_IO_STATUS_EOF:
611 g_debug("received EOF");
612 if (!s->virtio) {
613 return false;
614 }
615 /* fall through */
616 case G_IO_STATUS_AGAIN:
617 /* virtio causes us to spin here when no process is attached to
618 * host-side chardev. sleep a bit to mitigate this
619 */
620 if (s->virtio) {
621 usleep(100*1000);
622 }
623 return true;
624 default:
625 g_warning("unknown channel read status, closing");
626 return false;
627 }
628 return true;
629 }
630
631 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
632 int listen_fd)
633 {
634 GAChannelMethod channel_method;
635
636 if (strcmp(method, "virtio-serial") == 0) {
637 s->virtio = true; /* virtio requires special handling in some cases */
638 channel_method = GA_CHANNEL_VIRTIO_SERIAL;
639 } else if (strcmp(method, "isa-serial") == 0) {
640 channel_method = GA_CHANNEL_ISA_SERIAL;
641 } else if (strcmp(method, "unix-listen") == 0) {
642 channel_method = GA_CHANNEL_UNIX_LISTEN;
643 } else if (strcmp(method, "vsock-listen") == 0) {
644 channel_method = GA_CHANNEL_VSOCK_LISTEN;
645 } else {
646 g_critical("unsupported channel method/type: %s", method);
647 return false;
648 }
649
650 s->channel = ga_channel_new(channel_method, path, listen_fd,
651 channel_event_cb, s);
652 if (!s->channel) {
653 g_critical("failed to create guest agent channel");
654 return false;
655 }
656
657 return true;
658 }
659
660 #ifdef _WIN32
661 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data)
662 {
663 DWORD ret = NO_ERROR;
664 PDEV_BROADCAST_HDR broadcast_header = (PDEV_BROADCAST_HDR)data;
665
666 if (broadcast_header->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
667 switch (type) {
668 /* Device inserted */
669 case DBT_DEVICEARRIVAL:
670 /* Start QEMU-ga's service */
671 if (!SetEvent(ga_state->wakeup_event)) {
672 ret = GetLastError();
673 }
674 break;
675 /* Device removed */
676 case DBT_DEVICEQUERYREMOVE:
677 case DBT_DEVICEREMOVEPENDING:
678 case DBT_DEVICEREMOVECOMPLETE:
679 /* Stop QEMU-ga's service */
680 if (!ResetEvent(ga_state->wakeup_event)) {
681 ret = GetLastError();
682 }
683 break;
684 default:
685 ret = ERROR_CALL_NOT_IMPLEMENTED;
686 }
687 }
688 return ret;
689 }
690
691 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
692 LPVOID ctx)
693 {
694 DWORD ret = NO_ERROR;
695 GAService *service = &ga_state->service;
696
697 switch (ctrl)
698 {
699 case SERVICE_CONTROL_STOP:
700 case SERVICE_CONTROL_SHUTDOWN:
701 quit_handler(SIGTERM);
702 SetEvent(ga_state->wakeup_event);
703 service->status.dwCurrentState = SERVICE_STOP_PENDING;
704 SetServiceStatus(service->status_handle, &service->status);
705 break;
706 case SERVICE_CONTROL_DEVICEEVENT:
707 handle_serial_device_events(type, data);
708 break;
709
710 default:
711 ret = ERROR_CALL_NOT_IMPLEMENTED;
712 }
713 return ret;
714 }
715
716 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
717 {
718 GAService *service = &ga_state->service;
719
720 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
721 service_ctrl_handler, NULL);
722
723 if (service->status_handle == 0) {
724 g_critical("Failed to register extended requests function!\n");
725 return;
726 }
727
728 service->status.dwServiceType = SERVICE_WIN32;
729 service->status.dwCurrentState = SERVICE_RUNNING;
730 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
731 service->status.dwWin32ExitCode = NO_ERROR;
732 service->status.dwServiceSpecificExitCode = NO_ERROR;
733 service->status.dwCheckPoint = 0;
734 service->status.dwWaitHint = 0;
735 DEV_BROADCAST_DEVICEINTERFACE notification_filter;
736 ZeroMemory(&notification_filter, sizeof(notification_filter));
737 notification_filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
738 notification_filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
739 notification_filter.dbcc_classguid = GUID_VIOSERIAL_PORT;
740
741 service->device_notification_handle =
742 RegisterDeviceNotification(service->status_handle,
743 &notification_filter, DEVICE_NOTIFY_SERVICE_HANDLE);
744 if (!service->device_notification_handle) {
745 g_critical("Failed to register device notification handle!\n");
746 return;
747 }
748 SetServiceStatus(service->status_handle, &service->status);
749
750 run_agent(ga_state);
751
752 UnregisterDeviceNotification(service->device_notification_handle);
753 service->status.dwCurrentState = SERVICE_STOPPED;
754 SetServiceStatus(service->status_handle, &service->status);
755 }
756 #endif
757
758 static void set_persistent_state_defaults(GAPersistentState *pstate)
759 {
760 g_assert(pstate);
761 pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
762 }
763
764 static void persistent_state_from_keyfile(GAPersistentState *pstate,
765 GKeyFile *keyfile)
766 {
767 g_assert(pstate);
768 g_assert(keyfile);
769 /* if any fields are missing, either because the file was tampered with
770 * by agents of chaos, or because the field wasn't present at the time the
771 * file was created, the best we can ever do is start over with the default
772 * values. so load them now, and ignore any errors in accessing key-value
773 * pairs
774 */
775 set_persistent_state_defaults(pstate);
776
777 if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
778 pstate->fd_counter =
779 g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
780 }
781 }
782
783 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
784 GKeyFile *keyfile)
785 {
786 g_assert(pstate);
787 g_assert(keyfile);
788
789 g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
790 }
791
792 static gboolean write_persistent_state(const GAPersistentState *pstate,
793 const gchar *path)
794 {
795 GKeyFile *keyfile = g_key_file_new();
796 GError *gerr = NULL;
797 gboolean ret = true;
798 gchar *data = NULL;
799 gsize data_len;
800
801 g_assert(pstate);
802
803 persistent_state_to_keyfile(pstate, keyfile);
804 data = g_key_file_to_data(keyfile, &data_len, &gerr);
805 if (gerr) {
806 g_critical("failed to convert persistent state to string: %s",
807 gerr->message);
808 ret = false;
809 goto out;
810 }
811
812 g_file_set_contents(path, data, data_len, &gerr);
813 if (gerr) {
814 g_critical("failed to write persistent state to %s: %s",
815 path, gerr->message);
816 ret = false;
817 goto out;
818 }
819
820 out:
821 if (gerr) {
822 g_error_free(gerr);
823 }
824 if (keyfile) {
825 g_key_file_free(keyfile);
826 }
827 g_free(data);
828 return ret;
829 }
830
831 static gboolean read_persistent_state(GAPersistentState *pstate,
832 const gchar *path, gboolean frozen)
833 {
834 GKeyFile *keyfile = NULL;
835 GError *gerr = NULL;
836 struct stat st;
837 gboolean ret = true;
838
839 g_assert(pstate);
840
841 if (stat(path, &st) == -1) {
842 /* it's okay if state file doesn't exist, but any other error
843 * indicates a permissions issue or some other misconfiguration
844 * that we likely won't be able to recover from.
845 */
846 if (errno != ENOENT) {
847 g_critical("unable to access state file at path %s: %s",
848 path, strerror(errno));
849 ret = false;
850 goto out;
851 }
852
853 /* file doesn't exist. initialize state to default values and
854 * attempt to save now. (we could wait till later when we have
855 * modified state we need to commit, but if there's a problem,
856 * such as a missing parent directory, we want to catch it now)
857 *
858 * there is a potential scenario where someone either managed to
859 * update the agent from a version that didn't use a key store
860 * while qemu-ga thought the filesystem was frozen, or
861 * deleted the key store prior to issuing a fsfreeze, prior
862 * to restarting the agent. in this case we go ahead and defer
863 * initial creation till we actually have modified state to
864 * write, otherwise fail to recover from freeze.
865 */
866 set_persistent_state_defaults(pstate);
867 if (!frozen) {
868 ret = write_persistent_state(pstate, path);
869 if (!ret) {
870 g_critical("unable to create state file at path %s", path);
871 ret = false;
872 goto out;
873 }
874 }
875 ret = true;
876 goto out;
877 }
878
879 keyfile = g_key_file_new();
880 g_key_file_load_from_file(keyfile, path, 0, &gerr);
881 if (gerr) {
882 g_critical("error loading persistent state from path: %s, %s",
883 path, gerr->message);
884 ret = false;
885 goto out;
886 }
887
888 persistent_state_from_keyfile(pstate, keyfile);
889
890 out:
891 if (keyfile) {
892 g_key_file_free(keyfile);
893 }
894 if (gerr) {
895 g_error_free(gerr);
896 }
897
898 return ret;
899 }
900
901 int64_t ga_get_fd_handle(GAState *s, Error **errp)
902 {
903 int64_t handle;
904
905 g_assert(s->pstate_filepath);
906 /* we blacklist commands and avoid operations that potentially require
907 * writing to disk when we're in a frozen state. this includes opening
908 * new files, so we should never get here in that situation
909 */
910 g_assert(!ga_is_frozen(s));
911
912 handle = s->pstate.fd_counter++;
913
914 /* This should never happen on a reasonable timeframe, as guest-file-open
915 * would have to be issued 2^63 times */
916 if (s->pstate.fd_counter == INT64_MAX) {
917 abort();
918 }
919
920 if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
921 error_setg(errp, "failed to commit persistent state to disk");
922 return -1;
923 }
924
925 return handle;
926 }
927
928 static void ga_print_cmd(const QmpCommand *cmd, void *opaque)
929 {
930 printf("%s\n", qmp_command_name(cmd));
931 }
932
933 static GList *split_list(const gchar *str, const gchar *delim)
934 {
935 GList *list = NULL;
936 int i;
937 gchar **strv;
938
939 strv = g_strsplit(str, delim, -1);
940 for (i = 0; strv[i]; i++) {
941 list = g_list_prepend(list, strv[i]);
942 }
943 g_free(strv);
944
945 return list;
946 }
947
948 struct GAConfig {
949 char *channel_path;
950 char *method;
951 char *log_filepath;
952 char *pid_filepath;
953 #ifdef CONFIG_FSFREEZE
954 char *fsfreeze_hook;
955 #endif
956 char *state_dir;
957 #ifdef _WIN32
958 const char *service;
959 #endif
960 gchar *bliststr; /* blacklist may point to this string */
961 GList *blacklist;
962 int daemonize;
963 GLogLevelFlags log_level;
964 int dumpconf;
965 bool retry_path;
966 };
967
968 static void config_load(GAConfig *config)
969 {
970 GError *gerr = NULL;
971 GKeyFile *keyfile;
972 g_autofree char *conf = g_strdup(g_getenv("QGA_CONF")) ?: get_relocated_path(QGA_CONF_DEFAULT);
973
974 /* read system config */
975 keyfile = g_key_file_new();
976 if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
977 goto end;
978 }
979 if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
980 config->daemonize =
981 g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
982 }
983 if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
984 config->method =
985 g_key_file_get_string(keyfile, "general", "method", &gerr);
986 }
987 if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
988 config->channel_path =
989 g_key_file_get_string(keyfile, "general", "path", &gerr);
990 }
991 if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
992 config->log_filepath =
993 g_key_file_get_string(keyfile, "general", "logfile", &gerr);
994 }
995 if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
996 config->pid_filepath =
997 g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
998 }
999 #ifdef CONFIG_FSFREEZE
1000 if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
1001 config->fsfreeze_hook =
1002 g_key_file_get_string(keyfile,
1003 "general", "fsfreeze-hook", &gerr);
1004 }
1005 #endif
1006 if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
1007 config->state_dir =
1008 g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1009 }
1010 if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1011 g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1012 /* enable all log levels */
1013 config->log_level = G_LOG_LEVEL_MASK;
1014 }
1015 if (g_key_file_has_key(keyfile, "general", "retry-path", NULL)) {
1016 config->retry_path =
1017 g_key_file_get_boolean(keyfile, "general", "retry-path", &gerr);
1018 }
1019 if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
1020 config->bliststr =
1021 g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1022 config->blacklist = g_list_concat(config->blacklist,
1023 split_list(config->bliststr, ","));
1024 }
1025
1026 end:
1027 g_key_file_free(keyfile);
1028 if (gerr &&
1029 !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1030 g_critical("error loading configuration from path: %s, %s",
1031 conf, gerr->message);
1032 exit(EXIT_FAILURE);
1033 }
1034 g_clear_error(&gerr);
1035 }
1036
1037 static gchar *list_join(GList *list, const gchar separator)
1038 {
1039 GString *str = g_string_new("");
1040
1041 while (list) {
1042 str = g_string_append(str, (gchar *)list->data);
1043 list = g_list_next(list);
1044 if (list) {
1045 str = g_string_append_c(str, separator);
1046 }
1047 }
1048
1049 return g_string_free(str, FALSE);
1050 }
1051
1052 static void config_dump(GAConfig *config)
1053 {
1054 GError *error = NULL;
1055 GKeyFile *keyfile;
1056 gchar *tmp;
1057
1058 keyfile = g_key_file_new();
1059 g_assert(keyfile);
1060
1061 g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1062 g_key_file_set_string(keyfile, "general", "method", config->method);
1063 if (config->channel_path) {
1064 g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1065 }
1066 if (config->log_filepath) {
1067 g_key_file_set_string(keyfile, "general", "logfile",
1068 config->log_filepath);
1069 }
1070 g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1071 #ifdef CONFIG_FSFREEZE
1072 if (config->fsfreeze_hook) {
1073 g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1074 config->fsfreeze_hook);
1075 }
1076 #endif
1077 g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1078 g_key_file_set_boolean(keyfile, "general", "verbose",
1079 config->log_level == G_LOG_LEVEL_MASK);
1080 g_key_file_set_boolean(keyfile, "general", "retry-path",
1081 config->retry_path);
1082 tmp = list_join(config->blacklist, ',');
1083 g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1084 g_free(tmp);
1085
1086 tmp = g_key_file_to_data(keyfile, NULL, &error);
1087 if (error) {
1088 g_critical("Failed to dump keyfile: %s", error->message);
1089 g_clear_error(&error);
1090 } else {
1091 printf("%s", tmp);
1092 }
1093
1094 g_free(tmp);
1095 g_key_file_free(keyfile);
1096 }
1097
1098 static void config_parse(GAConfig *config, int argc, char **argv)
1099 {
1100 const char *sopt = "hVvdm:p:l:f:F::b:s:t:Dr";
1101 int opt_ind = 0, ch;
1102 const struct option lopt[] = {
1103 { "help", 0, NULL, 'h' },
1104 { "version", 0, NULL, 'V' },
1105 { "dump-conf", 0, NULL, 'D' },
1106 { "logfile", 1, NULL, 'l' },
1107 { "pidfile", 1, NULL, 'f' },
1108 #ifdef CONFIG_FSFREEZE
1109 { "fsfreeze-hook", 2, NULL, 'F' },
1110 #endif
1111 { "verbose", 0, NULL, 'v' },
1112 { "method", 1, NULL, 'm' },
1113 { "path", 1, NULL, 'p' },
1114 { "daemonize", 0, NULL, 'd' },
1115 { "blacklist", 1, NULL, 'b' },
1116 #ifdef _WIN32
1117 { "service", 1, NULL, 's' },
1118 #endif
1119 { "statedir", 1, NULL, 't' },
1120 { "retry-path", 0, NULL, 'r' },
1121 { NULL, 0, NULL, 0 }
1122 };
1123
1124 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1125 switch (ch) {
1126 case 'm':
1127 g_free(config->method);
1128 config->method = g_strdup(optarg);
1129 break;
1130 case 'p':
1131 g_free(config->channel_path);
1132 config->channel_path = g_strdup(optarg);
1133 break;
1134 case 'l':
1135 g_free(config->log_filepath);
1136 config->log_filepath = g_strdup(optarg);
1137 break;
1138 case 'f':
1139 g_free(config->pid_filepath);
1140 config->pid_filepath = g_strdup(optarg);
1141 break;
1142 #ifdef CONFIG_FSFREEZE
1143 case 'F':
1144 g_free(config->fsfreeze_hook);
1145 config->fsfreeze_hook = optarg ? g_strdup(optarg) : get_relocated_path(QGA_FSFREEZE_HOOK_DEFAULT);
1146 break;
1147 #endif
1148 case 't':
1149 g_free(config->state_dir);
1150 config->state_dir = g_strdup(optarg);
1151 break;
1152 case 'v':
1153 /* enable all log levels */
1154 config->log_level = G_LOG_LEVEL_MASK;
1155 break;
1156 case 'V':
1157 printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1158 exit(EXIT_SUCCESS);
1159 case 'd':
1160 config->daemonize = 1;
1161 break;
1162 case 'D':
1163 config->dumpconf = 1;
1164 break;
1165 case 'r':
1166 config->retry_path = true;
1167 break;
1168 case 'b': {
1169 if (is_help_option(optarg)) {
1170 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1171 exit(EXIT_SUCCESS);
1172 }
1173 config->blacklist = g_list_concat(config->blacklist,
1174 split_list(optarg, ","));
1175 break;
1176 }
1177 #ifdef _WIN32
1178 case 's':
1179 config->service = optarg;
1180 if (strcmp(config->service, "install") == 0) {
1181 if (ga_install_vss_provider()) {
1182 exit(EXIT_FAILURE);
1183 }
1184 if (ga_install_service(config->channel_path,
1185 config->log_filepath, config->state_dir)) {
1186 exit(EXIT_FAILURE);
1187 }
1188 exit(EXIT_SUCCESS);
1189 } else if (strcmp(config->service, "uninstall") == 0) {
1190 ga_uninstall_vss_provider();
1191 exit(ga_uninstall_service());
1192 } else if (strcmp(config->service, "vss-install") == 0) {
1193 if (ga_install_vss_provider()) {
1194 exit(EXIT_FAILURE);
1195 }
1196 exit(EXIT_SUCCESS);
1197 } else if (strcmp(config->service, "vss-uninstall") == 0) {
1198 ga_uninstall_vss_provider();
1199 exit(EXIT_SUCCESS);
1200 } else {
1201 printf("Unknown service command.\n");
1202 exit(EXIT_FAILURE);
1203 }
1204 break;
1205 #endif
1206 case 'h':
1207 usage(argv[0]);
1208 exit(EXIT_SUCCESS);
1209 case '?':
1210 g_print("Unknown option, try '%s --help' for more information.\n",
1211 argv[0]);
1212 exit(EXIT_FAILURE);
1213 }
1214 }
1215 }
1216
1217 static void config_free(GAConfig *config)
1218 {
1219 g_free(config->method);
1220 g_free(config->log_filepath);
1221 g_free(config->pid_filepath);
1222 g_free(config->state_dir);
1223 g_free(config->channel_path);
1224 g_free(config->bliststr);
1225 #ifdef CONFIG_FSFREEZE
1226 g_free(config->fsfreeze_hook);
1227 #endif
1228 g_list_free_full(config->blacklist, g_free);
1229 g_free(config);
1230 }
1231
1232 static bool check_is_frozen(GAState *s)
1233 {
1234 #ifndef _WIN32
1235 /* check if a previous instance of qemu-ga exited with filesystems' state
1236 * marked as frozen. this could be a stale value (a non-qemu-ga process
1237 * or reboot may have since unfrozen them), but better to require an
1238 * uneeded unfreeze than to risk hanging on start-up
1239 */
1240 struct stat st;
1241 if (stat(s->state_filepath_isfrozen, &st) == -1) {
1242 /* it's okay if the file doesn't exist, but if we can't access for
1243 * some other reason, such as permissions, there's a configuration
1244 * that needs to be addressed. so just bail now before we get into
1245 * more trouble later
1246 */
1247 if (errno != ENOENT) {
1248 g_critical("unable to access state file at path %s: %s",
1249 s->state_filepath_isfrozen, strerror(errno));
1250 return EXIT_FAILURE;
1251 }
1252 } else {
1253 g_warning("previous instance appears to have exited with frozen"
1254 " filesystems. deferring logging/pidfile creation and"
1255 " disabling non-fsfreeze-safe commands until"
1256 " guest-fsfreeze-thaw is issued, or filesystems are"
1257 " manually unfrozen and the file %s is removed",
1258 s->state_filepath_isfrozen);
1259 return true;
1260 }
1261 #endif
1262 return false;
1263 }
1264
1265 static GAState *initialize_agent(GAConfig *config, int socket_activation)
1266 {
1267 GAState *s = g_new0(GAState, 1);
1268
1269 g_assert(ga_state == NULL);
1270
1271 s->log_level = config->log_level;
1272 s->log_file = stderr;
1273 #ifdef CONFIG_FSFREEZE
1274 s->fsfreeze_hook = config->fsfreeze_hook;
1275 #endif
1276 s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1277 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1278 config->state_dir);
1279 s->frozen = check_is_frozen(s);
1280
1281 g_log_set_default_handler(ga_log, s);
1282 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1283 ga_enable_logging(s);
1284
1285 #ifdef _WIN32
1286 /* On win32 the state directory is application specific (be it the default
1287 * or a user override). We got past the command line parsing; let's create
1288 * the directory (with any intermediate directories). If we run into an
1289 * error later on, we won't try to clean up the directory, it is considered
1290 * persistent.
1291 */
1292 if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1293 g_critical("unable to create (an ancestor of) the state directory"
1294 " '%s': %s", config->state_dir, strerror(errno));
1295 return NULL;
1296 }
1297 #endif
1298
1299 if (ga_is_frozen(s)) {
1300 if (config->daemonize) {
1301 /* delay opening/locking of pidfile till filesystems are unfrozen */
1302 s->deferred_options.pid_filepath = config->pid_filepath;
1303 become_daemon(NULL);
1304 }
1305 if (config->log_filepath) {
1306 /* delay opening the log file till filesystems are unfrozen */
1307 s->deferred_options.log_filepath = config->log_filepath;
1308 }
1309 ga_disable_logging(s);
1310 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1311 } else {
1312 if (config->daemonize) {
1313 become_daemon(config->pid_filepath);
1314 }
1315 if (config->log_filepath) {
1316 FILE *log_file = ga_open_logfile(config->log_filepath);
1317 if (!log_file) {
1318 g_critical("unable to open specified log file: %s",
1319 strerror(errno));
1320 return NULL;
1321 }
1322 s->log_file = log_file;
1323 }
1324 }
1325
1326 /* load persistent state from disk */
1327 if (!read_persistent_state(&s->pstate,
1328 s->pstate_filepath,
1329 ga_is_frozen(s))) {
1330 g_critical("failed to load persistent state");
1331 return NULL;
1332 }
1333
1334 config->blacklist = ga_command_blacklist_init(config->blacklist);
1335 if (config->blacklist) {
1336 GList *l = config->blacklist;
1337 s->blacklist = config->blacklist;
1338 do {
1339 g_debug("disabling command: %s", (char *)l->data);
1340 qmp_disable_command(&ga_commands, l->data);
1341 l = g_list_next(l);
1342 } while (l);
1343 }
1344 s->command_state = ga_command_state_new();
1345 ga_command_state_init(s, s->command_state);
1346 ga_command_state_init_all(s->command_state);
1347 json_message_parser_init(&s->parser, process_event, s, NULL);
1348
1349 #ifndef _WIN32
1350 if (!register_signal_handlers()) {
1351 g_critical("failed to register signal handlers");
1352 return NULL;
1353 }
1354 #endif
1355
1356 s->main_loop = g_main_loop_new(NULL, false);
1357
1358 s->config = config;
1359 s->socket_activation = socket_activation;
1360
1361 #ifdef _WIN32
1362 s->wakeup_event = CreateEvent(NULL, TRUE, FALSE, TEXT("WakeUp"));
1363 if (s->wakeup_event == NULL) {
1364 g_critical("CreateEvent failed");
1365 return NULL;
1366 }
1367 #endif
1368
1369 ga_state = s;
1370 return s;
1371 }
1372
1373 static void cleanup_agent(GAState *s)
1374 {
1375 #ifdef _WIN32
1376 CloseHandle(s->wakeup_event);
1377 #endif
1378 if (s->command_state) {
1379 ga_command_state_cleanup_all(s->command_state);
1380 ga_command_state_free(s->command_state);
1381 json_message_parser_destroy(&s->parser);
1382 }
1383 g_free(s->pstate_filepath);
1384 g_free(s->state_filepath_isfrozen);
1385 if (s->main_loop) {
1386 g_main_loop_unref(s->main_loop);
1387 }
1388 g_free(s);
1389 ga_state = NULL;
1390 }
1391
1392 static int run_agent_once(GAState *s)
1393 {
1394 if (!channel_init(s, s->config->method, s->config->channel_path,
1395 s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1396 g_critical("failed to initialize guest agent channel");
1397 return EXIT_FAILURE;
1398 }
1399
1400 g_main_loop_run(ga_state->main_loop);
1401
1402 if (s->channel) {
1403 ga_channel_free(s->channel);
1404 }
1405
1406 return EXIT_SUCCESS;
1407 }
1408
1409 static void wait_for_channel_availability(GAState *s)
1410 {
1411 g_warning("waiting for channel path...");
1412 #ifndef _WIN32
1413 sleep(QGA_RETRY_INTERVAL);
1414 #else
1415 DWORD dwWaitResult;
1416
1417 dwWaitResult = WaitForSingleObject(s->wakeup_event, INFINITE);
1418
1419 switch (dwWaitResult) {
1420 case WAIT_OBJECT_0:
1421 break;
1422 case WAIT_TIMEOUT:
1423 break;
1424 default:
1425 g_critical("WaitForSingleObject failed");
1426 }
1427 #endif
1428 }
1429
1430 static int run_agent(GAState *s)
1431 {
1432 int ret = EXIT_SUCCESS;
1433
1434 s->force_exit = false;
1435
1436 do {
1437 ret = run_agent_once(s);
1438 if (s->config->retry_path && !s->force_exit) {
1439 g_warning("agent stopped unexpectedly, restarting...");
1440 wait_for_channel_availability(s);
1441 }
1442 } while (s->config->retry_path && !s->force_exit);
1443
1444 return ret;
1445 }
1446
1447 static void stop_agent(GAState *s, bool requested)
1448 {
1449 if (!s->force_exit) {
1450 s->force_exit = requested;
1451 }
1452
1453 if (g_main_loop_is_running(s->main_loop)) {
1454 g_main_loop_quit(s->main_loop);
1455 }
1456 }
1457
1458 int main(int argc, char **argv)
1459 {
1460 int ret = EXIT_SUCCESS;
1461 GAState *s;
1462 GAConfig *config = g_new0(GAConfig, 1);
1463 int socket_activation;
1464
1465 config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1466
1467 qemu_init_exec_dir(argv[0]);
1468 qga_qmp_init_marshal(&ga_commands);
1469
1470 init_dfl_pathnames();
1471 config_load(config);
1472 config_parse(config, argc, argv);
1473
1474 if (config->pid_filepath == NULL) {
1475 config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1476 }
1477
1478 if (config->state_dir == NULL) {
1479 config->state_dir = g_strdup(dfl_pathnames.state_dir);
1480 }
1481
1482 if (config->method == NULL) {
1483 config->method = g_strdup("virtio-serial");
1484 }
1485
1486 socket_activation = check_socket_activation();
1487 if (socket_activation > 1) {
1488 g_critical("qemu-ga only supports listening on one socket");
1489 ret = EXIT_FAILURE;
1490 goto end;
1491 }
1492 if (socket_activation) {
1493 SocketAddress *addr;
1494
1495 g_free(config->method);
1496 g_free(config->channel_path);
1497 config->method = NULL;
1498 config->channel_path = NULL;
1499
1500 addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1501 if (addr) {
1502 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1503 config->method = g_strdup("unix-listen");
1504 } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1505 config->method = g_strdup("vsock-listen");
1506 }
1507
1508 qapi_free_SocketAddress(addr);
1509 }
1510
1511 if (!config->method) {
1512 g_critical("unsupported listen fd type");
1513 ret = EXIT_FAILURE;
1514 goto end;
1515 }
1516 } else if (config->channel_path == NULL) {
1517 if (strcmp(config->method, "virtio-serial") == 0) {
1518 /* try the default path for the virtio-serial port */
1519 config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1520 } else if (strcmp(config->method, "isa-serial") == 0) {
1521 /* try the default path for the serial port - COM1 */
1522 config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1523 } else {
1524 g_critical("must specify a path for this channel");
1525 ret = EXIT_FAILURE;
1526 goto end;
1527 }
1528 }
1529
1530 if (config->dumpconf) {
1531 config_dump(config);
1532 goto end;
1533 }
1534
1535 s = initialize_agent(config, socket_activation);
1536 if (!s) {
1537 g_critical("error initializing guest agent");
1538 goto end;
1539 }
1540
1541 #ifdef _WIN32
1542 if (config->daemonize) {
1543 SERVICE_TABLE_ENTRY service_table[] = {
1544 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1545 StartServiceCtrlDispatcher(service_table);
1546 } else {
1547 ret = run_agent(s);
1548 }
1549 #else
1550 ret = run_agent(s);
1551 #endif
1552
1553 cleanup_agent(s);
1554
1555 end:
1556 if (config->daemonize) {
1557 unlink(config->pid_filepath);
1558 }
1559
1560 config_free(config);
1561
1562 return ret;
1563 }