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