Merge remote-tracking branch 'remotes/vivier2/tags/trivial-branch-for-5.2-pull-reques...
[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/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);
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 const char *buf;
531 QString *payload_qstr, *response_qstr;
532 GIOStatus status;
533
534 g_assert(s->channel);
535
536 if (!rsp) {
537 return 0;
538 }
539
540 payload_qstr = qobject_to_json(QOBJECT(rsp));
541 if (!payload_qstr) {
542 return -EINVAL;
543 }
544
545 if (s->delimit_response) {
546 s->delimit_response = false;
547 response_qstr = qstring_new();
548 qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
549 qstring_append(response_qstr, qstring_get_str(payload_qstr));
550 qobject_unref(payload_qstr);
551 } else {
552 response_qstr = payload_qstr;
553 }
554
555 qstring_append_chr(response_qstr, '\n');
556 buf = qstring_get_str(response_qstr);
557 status = ga_channel_write_all(s->channel, buf, strlen(buf));
558 qobject_unref(response_qstr);
559 if (status != G_IO_STATUS_NORMAL) {
560 return -EIO;
561 }
562
563 return 0;
564 }
565
566 /* handle requests/control events coming in over the channel */
567 static void process_event(void *opaque, QObject *obj, Error *err)
568 {
569 GAState *s = opaque;
570 QDict *rsp;
571 int ret;
572
573 g_debug("process_event: called");
574 assert(!obj != !err);
575 if (err) {
576 rsp = qmp_error_response(err);
577 goto end;
578 }
579
580 g_debug("processing command");
581 rsp = qmp_dispatch(&ga_commands, obj, false);
582
583 end:
584 ret = send_response(s, rsp);
585 if (ret < 0) {
586 g_warning("error sending error response: %s", strerror(-ret));
587 }
588 qobject_unref(rsp);
589 qobject_unref(obj);
590 }
591
592 /* false return signals GAChannel to close the current client connection */
593 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
594 {
595 GAState *s = data;
596 gchar buf[QGA_READ_COUNT_DEFAULT+1];
597 gsize count;
598 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
599 switch (status) {
600 case G_IO_STATUS_ERROR:
601 g_warning("error reading channel");
602 stop_agent(s, false);
603 return false;
604 case G_IO_STATUS_NORMAL:
605 buf[count] = 0;
606 g_debug("read data, count: %d, data: %s", (int)count, buf);
607 json_message_parser_feed(&s->parser, (char *)buf, (int)count);
608 break;
609 case G_IO_STATUS_EOF:
610 g_debug("received EOF");
611 if (!s->virtio) {
612 return false;
613 }
614 /* fall through */
615 case G_IO_STATUS_AGAIN:
616 /* virtio causes us to spin here when no process is attached to
617 * host-side chardev. sleep a bit to mitigate this
618 */
619 if (s->virtio) {
620 usleep(100*1000);
621 }
622 return true;
623 default:
624 g_warning("unknown channel read status, closing");
625 return false;
626 }
627 return true;
628 }
629
630 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
631 int listen_fd)
632 {
633 GAChannelMethod channel_method;
634
635 if (strcmp(method, "virtio-serial") == 0) {
636 s->virtio = true; /* virtio requires special handling in some cases */
637 channel_method = GA_CHANNEL_VIRTIO_SERIAL;
638 } else if (strcmp(method, "isa-serial") == 0) {
639 channel_method = GA_CHANNEL_ISA_SERIAL;
640 } else if (strcmp(method, "unix-listen") == 0) {
641 channel_method = GA_CHANNEL_UNIX_LISTEN;
642 } else if (strcmp(method, "vsock-listen") == 0) {
643 channel_method = GA_CHANNEL_VSOCK_LISTEN;
644 } else {
645 g_critical("unsupported channel method/type: %s", method);
646 return false;
647 }
648
649 s->channel = ga_channel_new(channel_method, path, listen_fd,
650 channel_event_cb, s);
651 if (!s->channel) {
652 g_critical("failed to create guest agent channel");
653 return false;
654 }
655
656 return true;
657 }
658
659 #ifdef _WIN32
660 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data)
661 {
662 DWORD ret = NO_ERROR;
663 PDEV_BROADCAST_HDR broadcast_header = (PDEV_BROADCAST_HDR)data;
664
665 if (broadcast_header->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
666 switch (type) {
667 /* Device inserted */
668 case DBT_DEVICEARRIVAL:
669 /* Start QEMU-ga's service */
670 if (!SetEvent(ga_state->wakeup_event)) {
671 ret = GetLastError();
672 }
673 break;
674 /* Device removed */
675 case DBT_DEVICEQUERYREMOVE:
676 case DBT_DEVICEREMOVEPENDING:
677 case DBT_DEVICEREMOVECOMPLETE:
678 /* Stop QEMU-ga's service */
679 if (!ResetEvent(ga_state->wakeup_event)) {
680 ret = GetLastError();
681 }
682 break;
683 default:
684 ret = ERROR_CALL_NOT_IMPLEMENTED;
685 }
686 }
687 return ret;
688 }
689
690 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
691 LPVOID ctx)
692 {
693 DWORD ret = NO_ERROR;
694 GAService *service = &ga_state->service;
695
696 switch (ctrl)
697 {
698 case SERVICE_CONTROL_STOP:
699 case SERVICE_CONTROL_SHUTDOWN:
700 quit_handler(SIGTERM);
701 SetEvent(ga_state->wakeup_event);
702 service->status.dwCurrentState = SERVICE_STOP_PENDING;
703 SetServiceStatus(service->status_handle, &service->status);
704 break;
705 case SERVICE_CONTROL_DEVICEEVENT:
706 handle_serial_device_events(type, data);
707 break;
708
709 default:
710 ret = ERROR_CALL_NOT_IMPLEMENTED;
711 }
712 return ret;
713 }
714
715 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
716 {
717 GAService *service = &ga_state->service;
718
719 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
720 service_ctrl_handler, NULL);
721
722 if (service->status_handle == 0) {
723 g_critical("Failed to register extended requests function!\n");
724 return;
725 }
726
727 service->status.dwServiceType = SERVICE_WIN32;
728 service->status.dwCurrentState = SERVICE_RUNNING;
729 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
730 service->status.dwWin32ExitCode = NO_ERROR;
731 service->status.dwServiceSpecificExitCode = NO_ERROR;
732 service->status.dwCheckPoint = 0;
733 service->status.dwWaitHint = 0;
734 DEV_BROADCAST_DEVICEINTERFACE notification_filter;
735 ZeroMemory(&notification_filter, sizeof(notification_filter));
736 notification_filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
737 notification_filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
738 notification_filter.dbcc_classguid = GUID_VIOSERIAL_PORT;
739
740 service->device_notification_handle =
741 RegisterDeviceNotification(service->status_handle,
742 &notification_filter, DEVICE_NOTIFY_SERVICE_HANDLE);
743 if (!service->device_notification_handle) {
744 g_critical("Failed to register device notification handle!\n");
745 return;
746 }
747 SetServiceStatus(service->status_handle, &service->status);
748
749 run_agent(ga_state);
750
751 UnregisterDeviceNotification(service->device_notification_handle);
752 service->status.dwCurrentState = SERVICE_STOPPED;
753 SetServiceStatus(service->status_handle, &service->status);
754 }
755 #endif
756
757 static void set_persistent_state_defaults(GAPersistentState *pstate)
758 {
759 g_assert(pstate);
760 pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
761 }
762
763 static void persistent_state_from_keyfile(GAPersistentState *pstate,
764 GKeyFile *keyfile)
765 {
766 g_assert(pstate);
767 g_assert(keyfile);
768 /* if any fields are missing, either because the file was tampered with
769 * by agents of chaos, or because the field wasn't present at the time the
770 * file was created, the best we can ever do is start over with the default
771 * values. so load them now, and ignore any errors in accessing key-value
772 * pairs
773 */
774 set_persistent_state_defaults(pstate);
775
776 if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
777 pstate->fd_counter =
778 g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
779 }
780 }
781
782 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
783 GKeyFile *keyfile)
784 {
785 g_assert(pstate);
786 g_assert(keyfile);
787
788 g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
789 }
790
791 static gboolean write_persistent_state(const GAPersistentState *pstate,
792 const gchar *path)
793 {
794 GKeyFile *keyfile = g_key_file_new();
795 GError *gerr = NULL;
796 gboolean ret = true;
797 gchar *data = NULL;
798 gsize data_len;
799
800 g_assert(pstate);
801
802 persistent_state_to_keyfile(pstate, keyfile);
803 data = g_key_file_to_data(keyfile, &data_len, &gerr);
804 if (gerr) {
805 g_critical("failed to convert persistent state to string: %s",
806 gerr->message);
807 ret = false;
808 goto out;
809 }
810
811 g_file_set_contents(path, data, data_len, &gerr);
812 if (gerr) {
813 g_critical("failed to write persistent state to %s: %s",
814 path, gerr->message);
815 ret = false;
816 goto out;
817 }
818
819 out:
820 if (gerr) {
821 g_error_free(gerr);
822 }
823 if (keyfile) {
824 g_key_file_free(keyfile);
825 }
826 g_free(data);
827 return ret;
828 }
829
830 static gboolean read_persistent_state(GAPersistentState *pstate,
831 const gchar *path, gboolean frozen)
832 {
833 GKeyFile *keyfile = NULL;
834 GError *gerr = NULL;
835 struct stat st;
836 gboolean ret = true;
837
838 g_assert(pstate);
839
840 if (stat(path, &st) == -1) {
841 /* it's okay if state file doesn't exist, but any other error
842 * indicates a permissions issue or some other misconfiguration
843 * that we likely won't be able to recover from.
844 */
845 if (errno != ENOENT) {
846 g_critical("unable to access state file at path %s: %s",
847 path, strerror(errno));
848 ret = false;
849 goto out;
850 }
851
852 /* file doesn't exist. initialize state to default values and
853 * attempt to save now. (we could wait till later when we have
854 * modified state we need to commit, but if there's a problem,
855 * such as a missing parent directory, we want to catch it now)
856 *
857 * there is a potential scenario where someone either managed to
858 * update the agent from a version that didn't use a key store
859 * while qemu-ga thought the filesystem was frozen, or
860 * deleted the key store prior to issuing a fsfreeze, prior
861 * to restarting the agent. in this case we go ahead and defer
862 * initial creation till we actually have modified state to
863 * write, otherwise fail to recover from freeze.
864 */
865 set_persistent_state_defaults(pstate);
866 if (!frozen) {
867 ret = write_persistent_state(pstate, path);
868 if (!ret) {
869 g_critical("unable to create state file at path %s", path);
870 ret = false;
871 goto out;
872 }
873 }
874 ret = true;
875 goto out;
876 }
877
878 keyfile = g_key_file_new();
879 g_key_file_load_from_file(keyfile, path, 0, &gerr);
880 if (gerr) {
881 g_critical("error loading persistent state from path: %s, %s",
882 path, gerr->message);
883 ret = false;
884 goto out;
885 }
886
887 persistent_state_from_keyfile(pstate, keyfile);
888
889 out:
890 if (keyfile) {
891 g_key_file_free(keyfile);
892 }
893 if (gerr) {
894 g_error_free(gerr);
895 }
896
897 return ret;
898 }
899
900 int64_t ga_get_fd_handle(GAState *s, Error **errp)
901 {
902 int64_t handle;
903
904 g_assert(s->pstate_filepath);
905 /* we blacklist commands and avoid operations that potentially require
906 * writing to disk when we're in a frozen state. this includes opening
907 * new files, so we should never get here in that situation
908 */
909 g_assert(!ga_is_frozen(s));
910
911 handle = s->pstate.fd_counter++;
912
913 /* This should never happen on a reasonable timeframe, as guest-file-open
914 * would have to be issued 2^63 times */
915 if (s->pstate.fd_counter == INT64_MAX) {
916 abort();
917 }
918
919 if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
920 error_setg(errp, "failed to commit persistent state to disk");
921 return -1;
922 }
923
924 return handle;
925 }
926
927 static void ga_print_cmd(const QmpCommand *cmd, void *opaque)
928 {
929 printf("%s\n", qmp_command_name(cmd));
930 }
931
932 static GList *split_list(const gchar *str, const gchar *delim)
933 {
934 GList *list = NULL;
935 int i;
936 gchar **strv;
937
938 strv = g_strsplit(str, delim, -1);
939 for (i = 0; strv[i]; i++) {
940 list = g_list_prepend(list, strv[i]);
941 }
942 g_free(strv);
943
944 return list;
945 }
946
947 struct GAConfig {
948 char *channel_path;
949 char *method;
950 char *log_filepath;
951 char *pid_filepath;
952 #ifdef CONFIG_FSFREEZE
953 char *fsfreeze_hook;
954 #endif
955 char *state_dir;
956 #ifdef _WIN32
957 const char *service;
958 #endif
959 gchar *bliststr; /* blacklist may point to this string */
960 GList *blacklist;
961 int daemonize;
962 GLogLevelFlags log_level;
963 int dumpconf;
964 bool retry_path;
965 };
966
967 static void config_load(GAConfig *config)
968 {
969 GError *gerr = NULL;
970 GKeyFile *keyfile;
971 const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
972
973 /* read system config */
974 keyfile = g_key_file_new();
975 if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
976 goto end;
977 }
978 if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
979 config->daemonize =
980 g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
981 }
982 if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
983 config->method =
984 g_key_file_get_string(keyfile, "general", "method", &gerr);
985 }
986 if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
987 config->channel_path =
988 g_key_file_get_string(keyfile, "general", "path", &gerr);
989 }
990 if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
991 config->log_filepath =
992 g_key_file_get_string(keyfile, "general", "logfile", &gerr);
993 }
994 if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
995 config->pid_filepath =
996 g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
997 }
998 #ifdef CONFIG_FSFREEZE
999 if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
1000 config->fsfreeze_hook =
1001 g_key_file_get_string(keyfile,
1002 "general", "fsfreeze-hook", &gerr);
1003 }
1004 #endif
1005 if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
1006 config->state_dir =
1007 g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1008 }
1009 if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1010 g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1011 /* enable all log levels */
1012 config->log_level = G_LOG_LEVEL_MASK;
1013 }
1014 if (g_key_file_has_key(keyfile, "general", "retry-path", NULL)) {
1015 config->retry_path =
1016 g_key_file_get_boolean(keyfile, "general", "retry-path", &gerr);
1017 }
1018 if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
1019 config->bliststr =
1020 g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1021 config->blacklist = g_list_concat(config->blacklist,
1022 split_list(config->bliststr, ","));
1023 }
1024
1025 end:
1026 g_key_file_free(keyfile);
1027 if (gerr &&
1028 !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1029 g_critical("error loading configuration from path: %s, %s",
1030 QGA_CONF_DEFAULT, gerr->message);
1031 exit(EXIT_FAILURE);
1032 }
1033 g_clear_error(&gerr);
1034 }
1035
1036 static gchar *list_join(GList *list, const gchar separator)
1037 {
1038 GString *str = g_string_new("");
1039
1040 while (list) {
1041 str = g_string_append(str, (gchar *)list->data);
1042 list = g_list_next(list);
1043 if (list) {
1044 str = g_string_append_c(str, separator);
1045 }
1046 }
1047
1048 return g_string_free(str, FALSE);
1049 }
1050
1051 static void config_dump(GAConfig *config)
1052 {
1053 GError *error = NULL;
1054 GKeyFile *keyfile;
1055 gchar *tmp;
1056
1057 keyfile = g_key_file_new();
1058 g_assert(keyfile);
1059
1060 g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1061 g_key_file_set_string(keyfile, "general", "method", config->method);
1062 if (config->channel_path) {
1063 g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1064 }
1065 if (config->log_filepath) {
1066 g_key_file_set_string(keyfile, "general", "logfile",
1067 config->log_filepath);
1068 }
1069 g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1070 #ifdef CONFIG_FSFREEZE
1071 if (config->fsfreeze_hook) {
1072 g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1073 config->fsfreeze_hook);
1074 }
1075 #endif
1076 g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1077 g_key_file_set_boolean(keyfile, "general", "verbose",
1078 config->log_level == G_LOG_LEVEL_MASK);
1079 g_key_file_set_boolean(keyfile, "general", "retry-path",
1080 config->retry_path);
1081 tmp = list_join(config->blacklist, ',');
1082 g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1083 g_free(tmp);
1084
1085 tmp = g_key_file_to_data(keyfile, NULL, &error);
1086 if (error) {
1087 g_critical("Failed to dump keyfile: %s", error->message);
1088 g_clear_error(&error);
1089 } else {
1090 printf("%s", tmp);
1091 }
1092
1093 g_free(tmp);
1094 g_key_file_free(keyfile);
1095 }
1096
1097 static void config_parse(GAConfig *config, int argc, char **argv)
1098 {
1099 const char *sopt = "hVvdm:p:l:f:F::b:s:t:Dr";
1100 int opt_ind = 0, ch;
1101 const struct option lopt[] = {
1102 { "help", 0, NULL, 'h' },
1103 { "version", 0, NULL, 'V' },
1104 { "dump-conf", 0, NULL, 'D' },
1105 { "logfile", 1, NULL, 'l' },
1106 { "pidfile", 1, NULL, 'f' },
1107 #ifdef CONFIG_FSFREEZE
1108 { "fsfreeze-hook", 2, NULL, 'F' },
1109 #endif
1110 { "verbose", 0, NULL, 'v' },
1111 { "method", 1, NULL, 'm' },
1112 { "path", 1, NULL, 'p' },
1113 { "daemonize", 0, NULL, 'd' },
1114 { "blacklist", 1, NULL, 'b' },
1115 #ifdef _WIN32
1116 { "service", 1, NULL, 's' },
1117 #endif
1118 { "statedir", 1, NULL, 't' },
1119 { "retry-path", 0, NULL, 'r' },
1120 { NULL, 0, NULL, 0 }
1121 };
1122
1123 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1124 switch (ch) {
1125 case 'm':
1126 g_free(config->method);
1127 config->method = g_strdup(optarg);
1128 break;
1129 case 'p':
1130 g_free(config->channel_path);
1131 config->channel_path = g_strdup(optarg);
1132 break;
1133 case 'l':
1134 g_free(config->log_filepath);
1135 config->log_filepath = g_strdup(optarg);
1136 break;
1137 case 'f':
1138 g_free(config->pid_filepath);
1139 config->pid_filepath = g_strdup(optarg);
1140 break;
1141 #ifdef CONFIG_FSFREEZE
1142 case 'F':
1143 g_free(config->fsfreeze_hook);
1144 config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1145 break;
1146 #endif
1147 case 't':
1148 g_free(config->state_dir);
1149 config->state_dir = g_strdup(optarg);
1150 break;
1151 case 'v':
1152 /* enable all log levels */
1153 config->log_level = G_LOG_LEVEL_MASK;
1154 break;
1155 case 'V':
1156 printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1157 exit(EXIT_SUCCESS);
1158 case 'd':
1159 config->daemonize = 1;
1160 break;
1161 case 'D':
1162 config->dumpconf = 1;
1163 break;
1164 case 'r':
1165 config->retry_path = true;
1166 break;
1167 case 'b': {
1168 if (is_help_option(optarg)) {
1169 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1170 exit(EXIT_SUCCESS);
1171 }
1172 config->blacklist = g_list_concat(config->blacklist,
1173 split_list(optarg, ","));
1174 break;
1175 }
1176 #ifdef _WIN32
1177 case 's':
1178 config->service = optarg;
1179 if (strcmp(config->service, "install") == 0) {
1180 if (ga_install_vss_provider()) {
1181 exit(EXIT_FAILURE);
1182 }
1183 if (ga_install_service(config->channel_path,
1184 config->log_filepath, config->state_dir)) {
1185 exit(EXIT_FAILURE);
1186 }
1187 exit(EXIT_SUCCESS);
1188 } else if (strcmp(config->service, "uninstall") == 0) {
1189 ga_uninstall_vss_provider();
1190 exit(ga_uninstall_service());
1191 } else if (strcmp(config->service, "vss-install") == 0) {
1192 if (ga_install_vss_provider()) {
1193 exit(EXIT_FAILURE);
1194 }
1195 exit(EXIT_SUCCESS);
1196 } else if (strcmp(config->service, "vss-uninstall") == 0) {
1197 ga_uninstall_vss_provider();
1198 exit(EXIT_SUCCESS);
1199 } else {
1200 printf("Unknown service command.\n");
1201 exit(EXIT_FAILURE);
1202 }
1203 break;
1204 #endif
1205 case 'h':
1206 usage(argv[0]);
1207 exit(EXIT_SUCCESS);
1208 case '?':
1209 g_print("Unknown option, try '%s --help' for more information.\n",
1210 argv[0]);
1211 exit(EXIT_FAILURE);
1212 }
1213 }
1214 }
1215
1216 static void config_free(GAConfig *config)
1217 {
1218 g_free(config->method);
1219 g_free(config->log_filepath);
1220 g_free(config->pid_filepath);
1221 g_free(config->state_dir);
1222 g_free(config->channel_path);
1223 g_free(config->bliststr);
1224 #ifdef CONFIG_FSFREEZE
1225 g_free(config->fsfreeze_hook);
1226 #endif
1227 g_list_free_full(config->blacklist, g_free);
1228 g_free(config);
1229 }
1230
1231 static bool check_is_frozen(GAState *s)
1232 {
1233 #ifndef _WIN32
1234 /* check if a previous instance of qemu-ga exited with filesystems' state
1235 * marked as frozen. this could be a stale value (a non-qemu-ga process
1236 * or reboot may have since unfrozen them), but better to require an
1237 * uneeded unfreeze than to risk hanging on start-up
1238 */
1239 struct stat st;
1240 if (stat(s->state_filepath_isfrozen, &st) == -1) {
1241 /* it's okay if the file doesn't exist, but if we can't access for
1242 * some other reason, such as permissions, there's a configuration
1243 * that needs to be addressed. so just bail now before we get into
1244 * more trouble later
1245 */
1246 if (errno != ENOENT) {
1247 g_critical("unable to access state file at path %s: %s",
1248 s->state_filepath_isfrozen, strerror(errno));
1249 return EXIT_FAILURE;
1250 }
1251 } else {
1252 g_warning("previous instance appears to have exited with frozen"
1253 " filesystems. deferring logging/pidfile creation and"
1254 " disabling non-fsfreeze-safe commands until"
1255 " guest-fsfreeze-thaw is issued, or filesystems are"
1256 " manually unfrozen and the file %s is removed",
1257 s->state_filepath_isfrozen);
1258 return true;
1259 }
1260 #endif
1261 return false;
1262 }
1263
1264 static GAState *initialize_agent(GAConfig *config, int socket_activation)
1265 {
1266 GAState *s = g_new0(GAState, 1);
1267
1268 g_assert(ga_state == NULL);
1269
1270 s->log_level = config->log_level;
1271 s->log_file = stderr;
1272 #ifdef CONFIG_FSFREEZE
1273 s->fsfreeze_hook = config->fsfreeze_hook;
1274 #endif
1275 s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1276 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1277 config->state_dir);
1278 s->frozen = check_is_frozen(s);
1279
1280 g_log_set_default_handler(ga_log, s);
1281 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1282 ga_enable_logging(s);
1283
1284 #ifdef _WIN32
1285 /* On win32 the state directory is application specific (be it the default
1286 * or a user override). We got past the command line parsing; let's create
1287 * the directory (with any intermediate directories). If we run into an
1288 * error later on, we won't try to clean up the directory, it is considered
1289 * persistent.
1290 */
1291 if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1292 g_critical("unable to create (an ancestor of) the state directory"
1293 " '%s': %s", config->state_dir, strerror(errno));
1294 return NULL;
1295 }
1296 #endif
1297
1298 if (ga_is_frozen(s)) {
1299 if (config->daemonize) {
1300 /* delay opening/locking of pidfile till filesystems are unfrozen */
1301 s->deferred_options.pid_filepath = config->pid_filepath;
1302 become_daemon(NULL);
1303 }
1304 if (config->log_filepath) {
1305 /* delay opening the log file till filesystems are unfrozen */
1306 s->deferred_options.log_filepath = config->log_filepath;
1307 }
1308 ga_disable_logging(s);
1309 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1310 } else {
1311 if (config->daemonize) {
1312 become_daemon(config->pid_filepath);
1313 }
1314 if (config->log_filepath) {
1315 FILE *log_file = ga_open_logfile(config->log_filepath);
1316 if (!log_file) {
1317 g_critical("unable to open specified log file: %s",
1318 strerror(errno));
1319 return NULL;
1320 }
1321 s->log_file = log_file;
1322 }
1323 }
1324
1325 /* load persistent state from disk */
1326 if (!read_persistent_state(&s->pstate,
1327 s->pstate_filepath,
1328 ga_is_frozen(s))) {
1329 g_critical("failed to load persistent state");
1330 return NULL;
1331 }
1332
1333 config->blacklist = ga_command_blacklist_init(config->blacklist);
1334 if (config->blacklist) {
1335 GList *l = config->blacklist;
1336 s->blacklist = config->blacklist;
1337 do {
1338 g_debug("disabling command: %s", (char *)l->data);
1339 qmp_disable_command(&ga_commands, l->data);
1340 l = g_list_next(l);
1341 } while (l);
1342 }
1343 s->command_state = ga_command_state_new();
1344 ga_command_state_init(s, s->command_state);
1345 ga_command_state_init_all(s->command_state);
1346 json_message_parser_init(&s->parser, process_event, s, NULL);
1347
1348 #ifndef _WIN32
1349 if (!register_signal_handlers()) {
1350 g_critical("failed to register signal handlers");
1351 return NULL;
1352 }
1353 #endif
1354
1355 s->main_loop = g_main_loop_new(NULL, false);
1356
1357 s->config = config;
1358 s->socket_activation = socket_activation;
1359
1360 #ifdef _WIN32
1361 s->wakeup_event = CreateEvent(NULL, TRUE, FALSE, TEXT("WakeUp"));
1362 if (s->wakeup_event == NULL) {
1363 g_critical("CreateEvent failed");
1364 return NULL;
1365 }
1366 #endif
1367
1368 ga_state = s;
1369 return s;
1370 }
1371
1372 static void cleanup_agent(GAState *s)
1373 {
1374 #ifdef _WIN32
1375 CloseHandle(s->wakeup_event);
1376 #endif
1377 if (s->command_state) {
1378 ga_command_state_cleanup_all(s->command_state);
1379 ga_command_state_free(s->command_state);
1380 json_message_parser_destroy(&s->parser);
1381 }
1382 g_free(s->pstate_filepath);
1383 g_free(s->state_filepath_isfrozen);
1384 if (s->main_loop) {
1385 g_main_loop_unref(s->main_loop);
1386 }
1387 g_free(s);
1388 ga_state = NULL;
1389 }
1390
1391 static int run_agent_once(GAState *s)
1392 {
1393 if (!channel_init(s, s->config->method, s->config->channel_path,
1394 s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1395 g_critical("failed to initialize guest agent channel");
1396 return EXIT_FAILURE;
1397 }
1398
1399 g_main_loop_run(ga_state->main_loop);
1400
1401 if (s->channel) {
1402 ga_channel_free(s->channel);
1403 }
1404
1405 return EXIT_SUCCESS;
1406 }
1407
1408 static void wait_for_channel_availability(GAState *s)
1409 {
1410 g_warning("waiting for channel path...");
1411 #ifndef _WIN32
1412 sleep(QGA_RETRY_INTERVAL);
1413 #else
1414 DWORD dwWaitResult;
1415
1416 dwWaitResult = WaitForSingleObject(s->wakeup_event, INFINITE);
1417
1418 switch (dwWaitResult) {
1419 case WAIT_OBJECT_0:
1420 break;
1421 case WAIT_TIMEOUT:
1422 break;
1423 default:
1424 g_critical("WaitForSingleObject failed");
1425 }
1426 #endif
1427 }
1428
1429 static int run_agent(GAState *s)
1430 {
1431 int ret = EXIT_SUCCESS;
1432
1433 s->force_exit = false;
1434
1435 do {
1436 ret = run_agent_once(s);
1437 if (s->config->retry_path && !s->force_exit) {
1438 g_warning("agent stopped unexpectedly, restarting...");
1439 wait_for_channel_availability(s);
1440 }
1441 } while (s->config->retry_path && !s->force_exit);
1442
1443 return ret;
1444 }
1445
1446 static void stop_agent(GAState *s, bool requested)
1447 {
1448 if (!s->force_exit) {
1449 s->force_exit = requested;
1450 }
1451
1452 if (g_main_loop_is_running(s->main_loop)) {
1453 g_main_loop_quit(s->main_loop);
1454 }
1455 }
1456
1457 int main(int argc, char **argv)
1458 {
1459 int ret = EXIT_SUCCESS;
1460 GAState *s;
1461 GAConfig *config = g_new0(GAConfig, 1);
1462 int socket_activation;
1463
1464 config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1465
1466 qga_qmp_init_marshal(&ga_commands);
1467
1468 init_dfl_pathnames();
1469 config_load(config);
1470 config_parse(config, argc, argv);
1471
1472 if (config->pid_filepath == NULL) {
1473 config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1474 }
1475
1476 if (config->state_dir == NULL) {
1477 config->state_dir = g_strdup(dfl_pathnames.state_dir);
1478 }
1479
1480 if (config->method == NULL) {
1481 config->method = g_strdup("virtio-serial");
1482 }
1483
1484 socket_activation = check_socket_activation();
1485 if (socket_activation > 1) {
1486 g_critical("qemu-ga only supports listening on one socket");
1487 ret = EXIT_FAILURE;
1488 goto end;
1489 }
1490 if (socket_activation) {
1491 SocketAddress *addr;
1492
1493 g_free(config->method);
1494 g_free(config->channel_path);
1495 config->method = NULL;
1496 config->channel_path = NULL;
1497
1498 addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1499 if (addr) {
1500 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1501 config->method = g_strdup("unix-listen");
1502 } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1503 config->method = g_strdup("vsock-listen");
1504 }
1505
1506 qapi_free_SocketAddress(addr);
1507 }
1508
1509 if (!config->method) {
1510 g_critical("unsupported listen fd type");
1511 ret = EXIT_FAILURE;
1512 goto end;
1513 }
1514 } else if (config->channel_path == NULL) {
1515 if (strcmp(config->method, "virtio-serial") == 0) {
1516 /* try the default path for the virtio-serial port */
1517 config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1518 } else if (strcmp(config->method, "isa-serial") == 0) {
1519 /* try the default path for the serial port - COM1 */
1520 config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1521 } else {
1522 g_critical("must specify a path for this channel");
1523 ret = EXIT_FAILURE;
1524 goto end;
1525 }
1526 }
1527
1528 if (config->dumpconf) {
1529 config_dump(config);
1530 goto end;
1531 }
1532
1533 s = initialize_agent(config, socket_activation);
1534 if (!s) {
1535 g_critical("error initializing guest agent");
1536 goto end;
1537 }
1538
1539 #ifdef _WIN32
1540 if (config->daemonize) {
1541 SERVICE_TABLE_ENTRY service_table[] = {
1542 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1543 StartServiceCtrlDispatcher(service_table);
1544 } else {
1545 ret = run_agent(s);
1546 }
1547 #else
1548 ret = run_agent(s);
1549 #endif
1550
1551 cleanup_agent(s);
1552
1553 end:
1554 if (config->daemonize) {
1555 unlink(config->pid_filepath);
1556 }
1557
1558 config_free(config);
1559
1560 return ret;
1561 }