i386: Fix pkg_id offset for EPYC cpu models
[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(rsp && s->channel);
535
536 payload_qstr = qobject_to_json(QOBJECT(rsp));
537 if (!payload_qstr) {
538 return -EINVAL;
539 }
540
541 if (s->delimit_response) {
542 s->delimit_response = false;
543 response_qstr = qstring_new();
544 qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
545 qstring_append(response_qstr, qstring_get_str(payload_qstr));
546 qobject_unref(payload_qstr);
547 } else {
548 response_qstr = payload_qstr;
549 }
550
551 qstring_append_chr(response_qstr, '\n');
552 buf = qstring_get_str(response_qstr);
553 status = ga_channel_write_all(s->channel, buf, strlen(buf));
554 qobject_unref(response_qstr);
555 if (status != G_IO_STATUS_NORMAL) {
556 return -EIO;
557 }
558
559 return 0;
560 }
561
562 /* handle requests/control events coming in over the channel */
563 static void process_event(void *opaque, QObject *obj, Error *err)
564 {
565 GAState *s = opaque;
566 QDict *rsp;
567 int ret;
568
569 g_debug("process_event: called");
570 assert(!obj != !err);
571 if (err) {
572 rsp = qmp_error_response(err);
573 goto end;
574 }
575
576 g_debug("processing command");
577 rsp = qmp_dispatch(&ga_commands, obj, false);
578
579 end:
580 ret = send_response(s, rsp);
581 if (ret < 0) {
582 g_warning("error sending error response: %s", strerror(-ret));
583 }
584 qobject_unref(rsp);
585 qobject_unref(obj);
586 }
587
588 /* false return signals GAChannel to close the current client connection */
589 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
590 {
591 GAState *s = data;
592 gchar buf[QGA_READ_COUNT_DEFAULT+1];
593 gsize count;
594 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
595 switch (status) {
596 case G_IO_STATUS_ERROR:
597 g_warning("error reading channel");
598 stop_agent(s, false);
599 return false;
600 case G_IO_STATUS_NORMAL:
601 buf[count] = 0;
602 g_debug("read data, count: %d, data: %s", (int)count, buf);
603 json_message_parser_feed(&s->parser, (char *)buf, (int)count);
604 break;
605 case G_IO_STATUS_EOF:
606 g_debug("received EOF");
607 if (!s->virtio) {
608 return false;
609 }
610 /* fall through */
611 case G_IO_STATUS_AGAIN:
612 /* virtio causes us to spin here when no process is attached to
613 * host-side chardev. sleep a bit to mitigate this
614 */
615 if (s->virtio) {
616 usleep(100*1000);
617 }
618 return true;
619 default:
620 g_warning("unknown channel read status, closing");
621 return false;
622 }
623 return true;
624 }
625
626 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
627 int listen_fd)
628 {
629 GAChannelMethod channel_method;
630
631 if (strcmp(method, "virtio-serial") == 0) {
632 s->virtio = true; /* virtio requires special handling in some cases */
633 channel_method = GA_CHANNEL_VIRTIO_SERIAL;
634 } else if (strcmp(method, "isa-serial") == 0) {
635 channel_method = GA_CHANNEL_ISA_SERIAL;
636 } else if (strcmp(method, "unix-listen") == 0) {
637 channel_method = GA_CHANNEL_UNIX_LISTEN;
638 } else if (strcmp(method, "vsock-listen") == 0) {
639 channel_method = GA_CHANNEL_VSOCK_LISTEN;
640 } else {
641 g_critical("unsupported channel method/type: %s", method);
642 return false;
643 }
644
645 s->channel = ga_channel_new(channel_method, path, listen_fd,
646 channel_event_cb, s);
647 if (!s->channel) {
648 g_critical("failed to create guest agent channel");
649 return false;
650 }
651
652 return true;
653 }
654
655 #ifdef _WIN32
656 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data)
657 {
658 DWORD ret = NO_ERROR;
659 PDEV_BROADCAST_HDR broadcast_header = (PDEV_BROADCAST_HDR)data;
660
661 if (broadcast_header->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
662 switch (type) {
663 /* Device inserted */
664 case DBT_DEVICEARRIVAL:
665 /* Start QEMU-ga's service */
666 if (!SetEvent(ga_state->wakeup_event)) {
667 ret = GetLastError();
668 }
669 break;
670 /* Device removed */
671 case DBT_DEVICEQUERYREMOVE:
672 case DBT_DEVICEREMOVEPENDING:
673 case DBT_DEVICEREMOVECOMPLETE:
674 /* Stop QEMU-ga's service */
675 if (!ResetEvent(ga_state->wakeup_event)) {
676 ret = GetLastError();
677 }
678 break;
679 default:
680 ret = ERROR_CALL_NOT_IMPLEMENTED;
681 }
682 }
683 return ret;
684 }
685
686 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
687 LPVOID ctx)
688 {
689 DWORD ret = NO_ERROR;
690 GAService *service = &ga_state->service;
691
692 switch (ctrl)
693 {
694 case SERVICE_CONTROL_STOP:
695 case SERVICE_CONTROL_SHUTDOWN:
696 quit_handler(SIGTERM);
697 SetEvent(ga_state->wakeup_event);
698 service->status.dwCurrentState = SERVICE_STOP_PENDING;
699 SetServiceStatus(service->status_handle, &service->status);
700 break;
701 case SERVICE_CONTROL_DEVICEEVENT:
702 handle_serial_device_events(type, data);
703 break;
704
705 default:
706 ret = ERROR_CALL_NOT_IMPLEMENTED;
707 }
708 return ret;
709 }
710
711 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
712 {
713 GAService *service = &ga_state->service;
714
715 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
716 service_ctrl_handler, NULL);
717
718 if (service->status_handle == 0) {
719 g_critical("Failed to register extended requests function!\n");
720 return;
721 }
722
723 service->status.dwServiceType = SERVICE_WIN32;
724 service->status.dwCurrentState = SERVICE_RUNNING;
725 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
726 service->status.dwWin32ExitCode = NO_ERROR;
727 service->status.dwServiceSpecificExitCode = NO_ERROR;
728 service->status.dwCheckPoint = 0;
729 service->status.dwWaitHint = 0;
730 DEV_BROADCAST_DEVICEINTERFACE notification_filter;
731 ZeroMemory(&notification_filter, sizeof(notification_filter));
732 notification_filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
733 notification_filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
734 notification_filter.dbcc_classguid = GUID_VIOSERIAL_PORT;
735
736 service->device_notification_handle =
737 RegisterDeviceNotification(service->status_handle,
738 &notification_filter, DEVICE_NOTIFY_SERVICE_HANDLE);
739 if (!service->device_notification_handle) {
740 g_critical("Failed to register device notification handle!\n");
741 return;
742 }
743 SetServiceStatus(service->status_handle, &service->status);
744
745 run_agent(ga_state);
746
747 UnregisterDeviceNotification(service->device_notification_handle);
748 service->status.dwCurrentState = SERVICE_STOPPED;
749 SetServiceStatus(service->status_handle, &service->status);
750 }
751 #endif
752
753 static void set_persistent_state_defaults(GAPersistentState *pstate)
754 {
755 g_assert(pstate);
756 pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
757 }
758
759 static void persistent_state_from_keyfile(GAPersistentState *pstate,
760 GKeyFile *keyfile)
761 {
762 g_assert(pstate);
763 g_assert(keyfile);
764 /* if any fields are missing, either because the file was tampered with
765 * by agents of chaos, or because the field wasn't present at the time the
766 * file was created, the best we can ever do is start over with the default
767 * values. so load them now, and ignore any errors in accessing key-value
768 * pairs
769 */
770 set_persistent_state_defaults(pstate);
771
772 if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
773 pstate->fd_counter =
774 g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
775 }
776 }
777
778 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
779 GKeyFile *keyfile)
780 {
781 g_assert(pstate);
782 g_assert(keyfile);
783
784 g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
785 }
786
787 static gboolean write_persistent_state(const GAPersistentState *pstate,
788 const gchar *path)
789 {
790 GKeyFile *keyfile = g_key_file_new();
791 GError *gerr = NULL;
792 gboolean ret = true;
793 gchar *data = NULL;
794 gsize data_len;
795
796 g_assert(pstate);
797
798 persistent_state_to_keyfile(pstate, keyfile);
799 data = g_key_file_to_data(keyfile, &data_len, &gerr);
800 if (gerr) {
801 g_critical("failed to convert persistent state to string: %s",
802 gerr->message);
803 ret = false;
804 goto out;
805 }
806
807 g_file_set_contents(path, data, data_len, &gerr);
808 if (gerr) {
809 g_critical("failed to write persistent state to %s: %s",
810 path, gerr->message);
811 ret = false;
812 goto out;
813 }
814
815 out:
816 if (gerr) {
817 g_error_free(gerr);
818 }
819 if (keyfile) {
820 g_key_file_free(keyfile);
821 }
822 g_free(data);
823 return ret;
824 }
825
826 static gboolean read_persistent_state(GAPersistentState *pstate,
827 const gchar *path, gboolean frozen)
828 {
829 GKeyFile *keyfile = NULL;
830 GError *gerr = NULL;
831 struct stat st;
832 gboolean ret = true;
833
834 g_assert(pstate);
835
836 if (stat(path, &st) == -1) {
837 /* it's okay if state file doesn't exist, but any other error
838 * indicates a permissions issue or some other misconfiguration
839 * that we likely won't be able to recover from.
840 */
841 if (errno != ENOENT) {
842 g_critical("unable to access state file at path %s: %s",
843 path, strerror(errno));
844 ret = false;
845 goto out;
846 }
847
848 /* file doesn't exist. initialize state to default values and
849 * attempt to save now. (we could wait till later when we have
850 * modified state we need to commit, but if there's a problem,
851 * such as a missing parent directory, we want to catch it now)
852 *
853 * there is a potential scenario where someone either managed to
854 * update the agent from a version that didn't use a key store
855 * while qemu-ga thought the filesystem was frozen, or
856 * deleted the key store prior to issuing a fsfreeze, prior
857 * to restarting the agent. in this case we go ahead and defer
858 * initial creation till we actually have modified state to
859 * write, otherwise fail to recover from freeze.
860 */
861 set_persistent_state_defaults(pstate);
862 if (!frozen) {
863 ret = write_persistent_state(pstate, path);
864 if (!ret) {
865 g_critical("unable to create state file at path %s", path);
866 ret = false;
867 goto out;
868 }
869 }
870 ret = true;
871 goto out;
872 }
873
874 keyfile = g_key_file_new();
875 g_key_file_load_from_file(keyfile, path, 0, &gerr);
876 if (gerr) {
877 g_critical("error loading persistent state from path: %s, %s",
878 path, gerr->message);
879 ret = false;
880 goto out;
881 }
882
883 persistent_state_from_keyfile(pstate, keyfile);
884
885 out:
886 if (keyfile) {
887 g_key_file_free(keyfile);
888 }
889 if (gerr) {
890 g_error_free(gerr);
891 }
892
893 return ret;
894 }
895
896 int64_t ga_get_fd_handle(GAState *s, Error **errp)
897 {
898 int64_t handle;
899
900 g_assert(s->pstate_filepath);
901 /* we blacklist commands and avoid operations that potentially require
902 * writing to disk when we're in a frozen state. this includes opening
903 * new files, so we should never get here in that situation
904 */
905 g_assert(!ga_is_frozen(s));
906
907 handle = s->pstate.fd_counter++;
908
909 /* This should never happen on a reasonable timeframe, as guest-file-open
910 * would have to be issued 2^63 times */
911 if (s->pstate.fd_counter == INT64_MAX) {
912 abort();
913 }
914
915 if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
916 error_setg(errp, "failed to commit persistent state to disk");
917 return -1;
918 }
919
920 return handle;
921 }
922
923 static void ga_print_cmd(const QmpCommand *cmd, void *opaque)
924 {
925 printf("%s\n", qmp_command_name(cmd));
926 }
927
928 static GList *split_list(const gchar *str, const gchar *delim)
929 {
930 GList *list = NULL;
931 int i;
932 gchar **strv;
933
934 strv = g_strsplit(str, delim, -1);
935 for (i = 0; strv[i]; i++) {
936 list = g_list_prepend(list, strv[i]);
937 }
938 g_free(strv);
939
940 return list;
941 }
942
943 struct GAConfig {
944 char *channel_path;
945 char *method;
946 char *log_filepath;
947 char *pid_filepath;
948 #ifdef CONFIG_FSFREEZE
949 char *fsfreeze_hook;
950 #endif
951 char *state_dir;
952 #ifdef _WIN32
953 const char *service;
954 #endif
955 gchar *bliststr; /* blacklist may point to this string */
956 GList *blacklist;
957 int daemonize;
958 GLogLevelFlags log_level;
959 int dumpconf;
960 bool retry_path;
961 };
962
963 static void config_load(GAConfig *config)
964 {
965 GError *gerr = NULL;
966 GKeyFile *keyfile;
967 const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
968
969 /* read system config */
970 keyfile = g_key_file_new();
971 if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
972 goto end;
973 }
974 if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
975 config->daemonize =
976 g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
977 }
978 if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
979 config->method =
980 g_key_file_get_string(keyfile, "general", "method", &gerr);
981 }
982 if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
983 config->channel_path =
984 g_key_file_get_string(keyfile, "general", "path", &gerr);
985 }
986 if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
987 config->log_filepath =
988 g_key_file_get_string(keyfile, "general", "logfile", &gerr);
989 }
990 if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
991 config->pid_filepath =
992 g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
993 }
994 #ifdef CONFIG_FSFREEZE
995 if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
996 config->fsfreeze_hook =
997 g_key_file_get_string(keyfile,
998 "general", "fsfreeze-hook", &gerr);
999 }
1000 #endif
1001 if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
1002 config->state_dir =
1003 g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1004 }
1005 if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1006 g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1007 /* enable all log levels */
1008 config->log_level = G_LOG_LEVEL_MASK;
1009 }
1010 if (g_key_file_has_key(keyfile, "general", "retry-path", NULL)) {
1011 config->retry_path =
1012 g_key_file_get_boolean(keyfile, "general", "retry-path", &gerr);
1013 }
1014 if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
1015 config->bliststr =
1016 g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1017 config->blacklist = g_list_concat(config->blacklist,
1018 split_list(config->bliststr, ","));
1019 }
1020
1021 end:
1022 g_key_file_free(keyfile);
1023 if (gerr &&
1024 !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1025 g_critical("error loading configuration from path: %s, %s",
1026 QGA_CONF_DEFAULT, gerr->message);
1027 exit(EXIT_FAILURE);
1028 }
1029 g_clear_error(&gerr);
1030 }
1031
1032 static gchar *list_join(GList *list, const gchar separator)
1033 {
1034 GString *str = g_string_new("");
1035
1036 while (list) {
1037 str = g_string_append(str, (gchar *)list->data);
1038 list = g_list_next(list);
1039 if (list) {
1040 str = g_string_append_c(str, separator);
1041 }
1042 }
1043
1044 return g_string_free(str, FALSE);
1045 }
1046
1047 static void config_dump(GAConfig *config)
1048 {
1049 GError *error = NULL;
1050 GKeyFile *keyfile;
1051 gchar *tmp;
1052
1053 keyfile = g_key_file_new();
1054 g_assert(keyfile);
1055
1056 g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1057 g_key_file_set_string(keyfile, "general", "method", config->method);
1058 if (config->channel_path) {
1059 g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1060 }
1061 if (config->log_filepath) {
1062 g_key_file_set_string(keyfile, "general", "logfile",
1063 config->log_filepath);
1064 }
1065 g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1066 #ifdef CONFIG_FSFREEZE
1067 if (config->fsfreeze_hook) {
1068 g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1069 config->fsfreeze_hook);
1070 }
1071 #endif
1072 g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1073 g_key_file_set_boolean(keyfile, "general", "verbose",
1074 config->log_level == G_LOG_LEVEL_MASK);
1075 g_key_file_set_boolean(keyfile, "general", "retry-path",
1076 config->retry_path);
1077 tmp = list_join(config->blacklist, ',');
1078 g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1079 g_free(tmp);
1080
1081 tmp = g_key_file_to_data(keyfile, NULL, &error);
1082 if (error) {
1083 g_critical("Failed to dump keyfile: %s", error->message);
1084 g_clear_error(&error);
1085 } else {
1086 printf("%s", tmp);
1087 }
1088
1089 g_free(tmp);
1090 g_key_file_free(keyfile);
1091 }
1092
1093 static void config_parse(GAConfig *config, int argc, char **argv)
1094 {
1095 const char *sopt = "hVvdm:p:l:f:F::b:s:t:Dr";
1096 int opt_ind = 0, ch;
1097 const struct option lopt[] = {
1098 { "help", 0, NULL, 'h' },
1099 { "version", 0, NULL, 'V' },
1100 { "dump-conf", 0, NULL, 'D' },
1101 { "logfile", 1, NULL, 'l' },
1102 { "pidfile", 1, NULL, 'f' },
1103 #ifdef CONFIG_FSFREEZE
1104 { "fsfreeze-hook", 2, NULL, 'F' },
1105 #endif
1106 { "verbose", 0, NULL, 'v' },
1107 { "method", 1, NULL, 'm' },
1108 { "path", 1, NULL, 'p' },
1109 { "daemonize", 0, NULL, 'd' },
1110 { "blacklist", 1, NULL, 'b' },
1111 #ifdef _WIN32
1112 { "service", 1, NULL, 's' },
1113 #endif
1114 { "statedir", 1, NULL, 't' },
1115 { "retry-path", 0, NULL, 'r' },
1116 { NULL, 0, NULL, 0 }
1117 };
1118
1119 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1120 switch (ch) {
1121 case 'm':
1122 g_free(config->method);
1123 config->method = g_strdup(optarg);
1124 break;
1125 case 'p':
1126 g_free(config->channel_path);
1127 config->channel_path = g_strdup(optarg);
1128 break;
1129 case 'l':
1130 g_free(config->log_filepath);
1131 config->log_filepath = g_strdup(optarg);
1132 break;
1133 case 'f':
1134 g_free(config->pid_filepath);
1135 config->pid_filepath = g_strdup(optarg);
1136 break;
1137 #ifdef CONFIG_FSFREEZE
1138 case 'F':
1139 g_free(config->fsfreeze_hook);
1140 config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1141 break;
1142 #endif
1143 case 't':
1144 g_free(config->state_dir);
1145 config->state_dir = g_strdup(optarg);
1146 break;
1147 case 'v':
1148 /* enable all log levels */
1149 config->log_level = G_LOG_LEVEL_MASK;
1150 break;
1151 case 'V':
1152 printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1153 exit(EXIT_SUCCESS);
1154 case 'd':
1155 config->daemonize = 1;
1156 break;
1157 case 'D':
1158 config->dumpconf = 1;
1159 break;
1160 case 'r':
1161 config->retry_path = true;
1162 break;
1163 case 'b': {
1164 if (is_help_option(optarg)) {
1165 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1166 exit(EXIT_SUCCESS);
1167 }
1168 config->blacklist = g_list_concat(config->blacklist,
1169 split_list(optarg, ","));
1170 break;
1171 }
1172 #ifdef _WIN32
1173 case 's':
1174 config->service = optarg;
1175 if (strcmp(config->service, "install") == 0) {
1176 if (ga_install_vss_provider()) {
1177 exit(EXIT_FAILURE);
1178 }
1179 if (ga_install_service(config->channel_path,
1180 config->log_filepath, config->state_dir)) {
1181 exit(EXIT_FAILURE);
1182 }
1183 exit(EXIT_SUCCESS);
1184 } else if (strcmp(config->service, "uninstall") == 0) {
1185 ga_uninstall_vss_provider();
1186 exit(ga_uninstall_service());
1187 } else if (strcmp(config->service, "vss-install") == 0) {
1188 if (ga_install_vss_provider()) {
1189 exit(EXIT_FAILURE);
1190 }
1191 exit(EXIT_SUCCESS);
1192 } else if (strcmp(config->service, "vss-uninstall") == 0) {
1193 ga_uninstall_vss_provider();
1194 exit(EXIT_SUCCESS);
1195 } else {
1196 printf("Unknown service command.\n");
1197 exit(EXIT_FAILURE);
1198 }
1199 break;
1200 #endif
1201 case 'h':
1202 usage(argv[0]);
1203 exit(EXIT_SUCCESS);
1204 case '?':
1205 g_print("Unknown option, try '%s --help' for more information.\n",
1206 argv[0]);
1207 exit(EXIT_FAILURE);
1208 }
1209 }
1210 }
1211
1212 static void config_free(GAConfig *config)
1213 {
1214 g_free(config->method);
1215 g_free(config->log_filepath);
1216 g_free(config->pid_filepath);
1217 g_free(config->state_dir);
1218 g_free(config->channel_path);
1219 g_free(config->bliststr);
1220 #ifdef CONFIG_FSFREEZE
1221 g_free(config->fsfreeze_hook);
1222 #endif
1223 g_list_free_full(config->blacklist, g_free);
1224 g_free(config);
1225 }
1226
1227 static bool check_is_frozen(GAState *s)
1228 {
1229 #ifndef _WIN32
1230 /* check if a previous instance of qemu-ga exited with filesystems' state
1231 * marked as frozen. this could be a stale value (a non-qemu-ga process
1232 * or reboot may have since unfrozen them), but better to require an
1233 * uneeded unfreeze than to risk hanging on start-up
1234 */
1235 struct stat st;
1236 if (stat(s->state_filepath_isfrozen, &st) == -1) {
1237 /* it's okay if the file doesn't exist, but if we can't access for
1238 * some other reason, such as permissions, there's a configuration
1239 * that needs to be addressed. so just bail now before we get into
1240 * more trouble later
1241 */
1242 if (errno != ENOENT) {
1243 g_critical("unable to access state file at path %s: %s",
1244 s->state_filepath_isfrozen, strerror(errno));
1245 return EXIT_FAILURE;
1246 }
1247 } else {
1248 g_warning("previous instance appears to have exited with frozen"
1249 " filesystems. deferring logging/pidfile creation and"
1250 " disabling non-fsfreeze-safe commands until"
1251 " guest-fsfreeze-thaw is issued, or filesystems are"
1252 " manually unfrozen and the file %s is removed",
1253 s->state_filepath_isfrozen);
1254 return true;
1255 }
1256 #endif
1257 return false;
1258 }
1259
1260 static GAState *initialize_agent(GAConfig *config, int socket_activation)
1261 {
1262 GAState *s = g_new0(GAState, 1);
1263
1264 g_assert(ga_state == NULL);
1265
1266 s->log_level = config->log_level;
1267 s->log_file = stderr;
1268 #ifdef CONFIG_FSFREEZE
1269 s->fsfreeze_hook = config->fsfreeze_hook;
1270 #endif
1271 s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1272 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1273 config->state_dir);
1274 s->frozen = check_is_frozen(s);
1275
1276 g_log_set_default_handler(ga_log, s);
1277 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1278 ga_enable_logging(s);
1279
1280 #ifdef _WIN32
1281 /* On win32 the state directory is application specific (be it the default
1282 * or a user override). We got past the command line parsing; let's create
1283 * the directory (with any intermediate directories). If we run into an
1284 * error later on, we won't try to clean up the directory, it is considered
1285 * persistent.
1286 */
1287 if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1288 g_critical("unable to create (an ancestor of) the state directory"
1289 " '%s': %s", config->state_dir, strerror(errno));
1290 return NULL;
1291 }
1292 #endif
1293
1294 if (ga_is_frozen(s)) {
1295 if (config->daemonize) {
1296 /* delay opening/locking of pidfile till filesystems are unfrozen */
1297 s->deferred_options.pid_filepath = config->pid_filepath;
1298 become_daemon(NULL);
1299 }
1300 if (config->log_filepath) {
1301 /* delay opening the log file till filesystems are unfrozen */
1302 s->deferred_options.log_filepath = config->log_filepath;
1303 }
1304 ga_disable_logging(s);
1305 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1306 } else {
1307 if (config->daemonize) {
1308 become_daemon(config->pid_filepath);
1309 }
1310 if (config->log_filepath) {
1311 FILE *log_file = ga_open_logfile(config->log_filepath);
1312 if (!log_file) {
1313 g_critical("unable to open specified log file: %s",
1314 strerror(errno));
1315 return NULL;
1316 }
1317 s->log_file = log_file;
1318 }
1319 }
1320
1321 /* load persistent state from disk */
1322 if (!read_persistent_state(&s->pstate,
1323 s->pstate_filepath,
1324 ga_is_frozen(s))) {
1325 g_critical("failed to load persistent state");
1326 return NULL;
1327 }
1328
1329 config->blacklist = ga_command_blacklist_init(config->blacklist);
1330 if (config->blacklist) {
1331 GList *l = config->blacklist;
1332 s->blacklist = config->blacklist;
1333 do {
1334 g_debug("disabling command: %s", (char *)l->data);
1335 qmp_disable_command(&ga_commands, l->data);
1336 l = g_list_next(l);
1337 } while (l);
1338 }
1339 s->command_state = ga_command_state_new();
1340 ga_command_state_init(s, s->command_state);
1341 ga_command_state_init_all(s->command_state);
1342 json_message_parser_init(&s->parser, process_event, s, NULL);
1343
1344 #ifndef _WIN32
1345 if (!register_signal_handlers()) {
1346 g_critical("failed to register signal handlers");
1347 return NULL;
1348 }
1349 #endif
1350
1351 s->main_loop = g_main_loop_new(NULL, false);
1352
1353 s->config = config;
1354 s->socket_activation = socket_activation;
1355
1356 #ifdef _WIN32
1357 s->wakeup_event = CreateEvent(NULL, TRUE, FALSE, TEXT("WakeUp"));
1358 if (s->wakeup_event == NULL) {
1359 g_critical("CreateEvent failed");
1360 return NULL;
1361 }
1362 #endif
1363
1364 ga_state = s;
1365 return s;
1366 }
1367
1368 static void cleanup_agent(GAState *s)
1369 {
1370 #ifdef _WIN32
1371 CloseHandle(s->wakeup_event);
1372 #endif
1373 if (s->command_state) {
1374 ga_command_state_cleanup_all(s->command_state);
1375 ga_command_state_free(s->command_state);
1376 json_message_parser_destroy(&s->parser);
1377 }
1378 g_free(s->pstate_filepath);
1379 g_free(s->state_filepath_isfrozen);
1380 if (s->main_loop) {
1381 g_main_loop_unref(s->main_loop);
1382 }
1383 g_free(s);
1384 ga_state = NULL;
1385 }
1386
1387 static int run_agent_once(GAState *s)
1388 {
1389 if (!channel_init(s, s->config->method, s->config->channel_path,
1390 s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1391 g_critical("failed to initialize guest agent channel");
1392 return EXIT_FAILURE;
1393 }
1394
1395 g_main_loop_run(ga_state->main_loop);
1396
1397 if (s->channel) {
1398 ga_channel_free(s->channel);
1399 }
1400
1401 return EXIT_SUCCESS;
1402 }
1403
1404 static void wait_for_channel_availability(GAState *s)
1405 {
1406 g_warning("waiting for channel path...");
1407 #ifndef _WIN32
1408 sleep(QGA_RETRY_INTERVAL);
1409 #else
1410 DWORD dwWaitResult;
1411
1412 dwWaitResult = WaitForSingleObject(s->wakeup_event, INFINITE);
1413
1414 switch (dwWaitResult) {
1415 case WAIT_OBJECT_0:
1416 break;
1417 case WAIT_TIMEOUT:
1418 break;
1419 default:
1420 g_critical("WaitForSingleObject failed");
1421 }
1422 #endif
1423 }
1424
1425 static int run_agent(GAState *s)
1426 {
1427 int ret = EXIT_SUCCESS;
1428
1429 s->force_exit = false;
1430
1431 do {
1432 ret = run_agent_once(s);
1433 if (s->config->retry_path && !s->force_exit) {
1434 g_warning("agent stopped unexpectedly, restarting...");
1435 wait_for_channel_availability(s);
1436 }
1437 } while (s->config->retry_path && !s->force_exit);
1438
1439 return ret;
1440 }
1441
1442 static void stop_agent(GAState *s, bool requested)
1443 {
1444 if (!s->force_exit) {
1445 s->force_exit = requested;
1446 }
1447
1448 if (g_main_loop_is_running(s->main_loop)) {
1449 g_main_loop_quit(s->main_loop);
1450 }
1451 }
1452
1453 int main(int argc, char **argv)
1454 {
1455 int ret = EXIT_SUCCESS;
1456 GAState *s;
1457 GAConfig *config = g_new0(GAConfig, 1);
1458 int socket_activation;
1459
1460 config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1461
1462 qga_qmp_init_marshal(&ga_commands);
1463
1464 init_dfl_pathnames();
1465 config_load(config);
1466 config_parse(config, argc, argv);
1467
1468 if (config->pid_filepath == NULL) {
1469 config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1470 }
1471
1472 if (config->state_dir == NULL) {
1473 config->state_dir = g_strdup(dfl_pathnames.state_dir);
1474 }
1475
1476 if (config->method == NULL) {
1477 config->method = g_strdup("virtio-serial");
1478 }
1479
1480 socket_activation = check_socket_activation();
1481 if (socket_activation > 1) {
1482 g_critical("qemu-ga only supports listening on one socket");
1483 ret = EXIT_FAILURE;
1484 goto end;
1485 }
1486 if (socket_activation) {
1487 SocketAddress *addr;
1488
1489 g_free(config->method);
1490 g_free(config->channel_path);
1491 config->method = NULL;
1492 config->channel_path = NULL;
1493
1494 addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1495 if (addr) {
1496 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1497 config->method = g_strdup("unix-listen");
1498 } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1499 config->method = g_strdup("vsock-listen");
1500 }
1501
1502 qapi_free_SocketAddress(addr);
1503 }
1504
1505 if (!config->method) {
1506 g_critical("unsupported listen fd type");
1507 ret = EXIT_FAILURE;
1508 goto end;
1509 }
1510 } else if (config->channel_path == NULL) {
1511 if (strcmp(config->method, "virtio-serial") == 0) {
1512 /* try the default path for the virtio-serial port */
1513 config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1514 } else if (strcmp(config->method, "isa-serial") == 0) {
1515 /* try the default path for the serial port - COM1 */
1516 config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1517 } else {
1518 g_critical("must specify a path for this channel");
1519 ret = EXIT_FAILURE;
1520 goto end;
1521 }
1522 }
1523
1524 if (config->dumpconf) {
1525 config_dump(config);
1526 goto end;
1527 }
1528
1529 s = initialize_agent(config, socket_activation);
1530 if (!s) {
1531 g_critical("error initializing guest agent");
1532 goto end;
1533 }
1534
1535 #ifdef _WIN32
1536 if (config->daemonize) {
1537 SERVICE_TABLE_ENTRY service_table[] = {
1538 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1539 StartServiceCtrlDispatcher(service_table);
1540 } else {
1541 ret = run_agent(s);
1542 }
1543 #else
1544 ret = run_agent(s);
1545 #endif
1546
1547 cleanup_agent(s);
1548
1549 end:
1550 if (config->daemonize) {
1551 unlink(config->pid_filepath);
1552 }
1553
1554 config_free(config);
1555
1556 return ret;
1557 }