xref: /openbmc/qemu/qga/main.c (revision 795c40b8)
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 #include "qemu/osdep.h"
14 #include <getopt.h>
15 #include <glib/gstdio.h>
16 #ifndef _WIN32
17 #include <syslog.h>
18 #include <sys/wait.h>
19 #endif
20 #include "qapi/qmp/json-streamer.h"
21 #include "qapi/qmp/json-parser.h"
22 #include "qapi/qmp/qint.h"
23 #include "qapi/qmp/qjson.h"
24 #include "qga/guest-agent-core.h"
25 #include "qemu/module.h"
26 #include "qapi/qmp/qerror.h"
27 #include "qapi/qmp/dispatch.h"
28 #include "qga/channel.h"
29 #include "qemu/bswap.h"
30 #include "qemu/help_option.h"
31 #include "qemu/sockets.h"
32 #include "qemu/systemd.h"
33 #ifdef _WIN32
34 #include "qga/service-win32.h"
35 #include "qga/vss-win32.h"
36 #endif
37 #ifdef __linux__
38 #include <linux/fs.h>
39 #ifdef FIFREEZE
40 #define CONFIG_FSFREEZE
41 #endif
42 #endif
43 
44 #ifndef _WIN32
45 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
46 #define QGA_STATE_RELATIVE_DIR  "run"
47 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
48 #else
49 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
50 #define QGA_STATE_RELATIVE_DIR  "qemu-ga"
51 #define QGA_SERIAL_PATH_DEFAULT "COM1"
52 #endif
53 #ifdef CONFIG_FSFREEZE
54 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
55 #endif
56 #define QGA_SENTINEL_BYTE 0xFF
57 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
58 
59 static struct {
60     const char *state_dir;
61     const char *pidfile;
62 } dfl_pathnames;
63 
64 typedef struct GAPersistentState {
65 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
66     int64_t fd_counter;
67 } GAPersistentState;
68 
69 struct GAState {
70     JSONMessageParser parser;
71     GMainLoop *main_loop;
72     GAChannel *channel;
73     bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
74     GACommandState *command_state;
75     GLogLevelFlags log_level;
76     FILE *log_file;
77     bool logging_enabled;
78 #ifdef _WIN32
79     GAService service;
80 #endif
81     bool delimit_response;
82     bool frozen;
83     GList *blacklist;
84     char *state_filepath_isfrozen;
85     struct {
86         const char *log_filepath;
87         const char *pid_filepath;
88     } deferred_options;
89 #ifdef CONFIG_FSFREEZE
90     const char *fsfreeze_hook;
91 #endif
92     gchar *pstate_filepath;
93     GAPersistentState pstate;
94 };
95 
96 struct GAState *ga_state;
97 QmpCommandList ga_commands;
98 
99 /* commands that are safe to issue while filesystems are frozen */
100 static const char *ga_freeze_whitelist[] = {
101     "guest-ping",
102     "guest-info",
103     "guest-sync",
104     "guest-sync-delimited",
105     "guest-fsfreeze-status",
106     "guest-fsfreeze-thaw",
107     NULL
108 };
109 
110 #ifdef _WIN32
111 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
112                                   LPVOID ctx);
113 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
114 #endif
115 
116 static void
117 init_dfl_pathnames(void)
118 {
119     g_assert(dfl_pathnames.state_dir == NULL);
120     g_assert(dfl_pathnames.pidfile == NULL);
121     dfl_pathnames.state_dir = qemu_get_local_state_pathname(
122       QGA_STATE_RELATIVE_DIR);
123     dfl_pathnames.pidfile   = qemu_get_local_state_pathname(
124       QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
125 }
126 
127 static void quit_handler(int sig)
128 {
129     /* if we're frozen, don't exit unless we're absolutely forced to,
130      * because it's basically impossible for graceful exit to complete
131      * unless all log/pid files are on unfreezable filesystems. there's
132      * also a very likely chance killing the agent before unfreezing
133      * the filesystems is a mistake (or will be viewed as one later).
134      * On Windows the freeze interval is limited to 10 seconds, so
135      * we should quit, but first we should wait for the timeout, thaw
136      * the filesystem and quit.
137      */
138     if (ga_is_frozen(ga_state)) {
139 #ifdef _WIN32
140         int i = 0;
141         Error *err = NULL;
142         HANDLE hEventTimeout;
143 
144         g_debug("Thawing filesystems before exiting");
145 
146         hEventTimeout = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_TIMEOUT);
147         if (hEventTimeout) {
148             WaitForSingleObject(hEventTimeout, 0);
149             CloseHandle(hEventTimeout);
150         }
151         qga_vss_fsfreeze(&i, false, &err);
152         if (err) {
153             g_debug("Error unfreezing filesystems prior to exiting: %s",
154                 error_get_pretty(err));
155             error_free(err);
156         }
157 #else
158         return;
159 #endif
160     }
161     g_debug("received signal num %d, quitting", sig);
162 
163     if (g_main_loop_is_running(ga_state->main_loop)) {
164         g_main_loop_quit(ga_state->main_loop);
165     }
166 }
167 
168 #ifndef _WIN32
169 static gboolean register_signal_handlers(void)
170 {
171     struct sigaction sigact;
172     int ret;
173 
174     memset(&sigact, 0, sizeof(struct sigaction));
175     sigact.sa_handler = quit_handler;
176 
177     ret = sigaction(SIGINT, &sigact, NULL);
178     if (ret == -1) {
179         g_error("error configuring signal handler: %s", strerror(errno));
180     }
181     ret = sigaction(SIGTERM, &sigact, NULL);
182     if (ret == -1) {
183         g_error("error configuring signal handler: %s", strerror(errno));
184     }
185 
186     sigact.sa_handler = SIG_IGN;
187     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
188         g_error("error configuring SIGPIPE signal handler: %s",
189                 strerror(errno));
190     }
191 
192     return true;
193 }
194 
195 /* TODO: use this in place of all post-fork() fclose(std*) callers */
196 void reopen_fd_to_null(int fd)
197 {
198     int nullfd;
199 
200     nullfd = open("/dev/null", O_RDWR);
201     if (nullfd < 0) {
202         return;
203     }
204 
205     dup2(nullfd, fd);
206 
207     if (nullfd != fd) {
208         close(nullfd);
209     }
210 }
211 #endif
212 
213 static void usage(const char *cmd)
214 {
215     printf(
216 "Usage: %s [-m <method> -p <path>] [<options>]\n"
217 "QEMU Guest Agent %s\n"
218 "\n"
219 "  -m, --method      transport method: one of unix-listen, virtio-serial,\n"
220 "                    isa-serial, or vsock-listen (virtio-serial is the default)\n"
221 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
222 "                    %s,\n"
223 "                    the default for isa-serial is:\n"
224 "                    %s)\n"
225 "  -l, --logfile     set logfile path, logs to stderr by default\n"
226 "  -f, --pidfile     specify pidfile (default is %s)\n"
227 #ifdef CONFIG_FSFREEZE
228 "  -F, --fsfreeze-hook\n"
229 "                    enable fsfreeze hook. Accepts an optional argument that\n"
230 "                    specifies script to run on freeze/thaw. Script will be\n"
231 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
232 "                    (default is %s)\n"
233 "                    If using -F with an argument, do not follow -F with a\n"
234 "                    space.\n"
235 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
236 #endif
237 "  -t, --statedir    specify dir to store state information (absolute paths\n"
238 "                    only, default is %s)\n"
239 "  -v, --verbose     log extra debugging information\n"
240 "  -V, --version     print version information and exit\n"
241 "  -d, --daemonize   become a daemon\n"
242 #ifdef _WIN32
243 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
244 #endif
245 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
246 "                    to list available RPCs)\n"
247 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
248 "                    options / command-line parameters to stdout\n"
249 "  -h, --help        display this help and exit\n"
250 "\n"
251 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
252     , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
253     dfl_pathnames.pidfile,
254 #ifdef CONFIG_FSFREEZE
255     QGA_FSFREEZE_HOOK_DEFAULT,
256 #endif
257     dfl_pathnames.state_dir);
258 }
259 
260 static const char *ga_log_level_str(GLogLevelFlags level)
261 {
262     switch (level & G_LOG_LEVEL_MASK) {
263         case G_LOG_LEVEL_ERROR:
264             return "error";
265         case G_LOG_LEVEL_CRITICAL:
266             return "critical";
267         case G_LOG_LEVEL_WARNING:
268             return "warning";
269         case G_LOG_LEVEL_MESSAGE:
270             return "message";
271         case G_LOG_LEVEL_INFO:
272             return "info";
273         case G_LOG_LEVEL_DEBUG:
274             return "debug";
275         default:
276             return "user";
277     }
278 }
279 
280 bool ga_logging_enabled(GAState *s)
281 {
282     return s->logging_enabled;
283 }
284 
285 void ga_disable_logging(GAState *s)
286 {
287     s->logging_enabled = false;
288 }
289 
290 void ga_enable_logging(GAState *s)
291 {
292     s->logging_enabled = true;
293 }
294 
295 static void ga_log(const gchar *domain, GLogLevelFlags level,
296                    const gchar *msg, gpointer opaque)
297 {
298     GAState *s = opaque;
299     GTimeVal time;
300     const char *level_str = ga_log_level_str(level);
301 
302     if (!ga_logging_enabled(s)) {
303         return;
304     }
305 
306     level &= G_LOG_LEVEL_MASK;
307 #ifndef _WIN32
308     if (g_strcmp0(domain, "syslog") == 0) {
309         syslog(LOG_INFO, "%s: %s", level_str, msg);
310     } else if (level & s->log_level) {
311 #else
312     if (level & s->log_level) {
313 #endif
314         g_get_current_time(&time);
315         fprintf(s->log_file,
316                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
317         fflush(s->log_file);
318     }
319 }
320 
321 void ga_set_response_delimited(GAState *s)
322 {
323     s->delimit_response = true;
324 }
325 
326 static FILE *ga_open_logfile(const char *logfile)
327 {
328     FILE *f;
329 
330     f = fopen(logfile, "a");
331     if (!f) {
332         return NULL;
333     }
334 
335     qemu_set_cloexec(fileno(f));
336     return f;
337 }
338 
339 #ifndef _WIN32
340 static bool ga_open_pidfile(const char *pidfile)
341 {
342     int pidfd;
343     char pidstr[32];
344 
345     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
346     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
347         g_critical("Cannot lock pid file, %s", strerror(errno));
348         if (pidfd != -1) {
349             close(pidfd);
350         }
351         return false;
352     }
353 
354     if (ftruncate(pidfd, 0)) {
355         g_critical("Failed to truncate pid file");
356         goto fail;
357     }
358     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
359     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
360         g_critical("Failed to write pid file");
361         goto fail;
362     }
363 
364     /* keep pidfile open & locked forever */
365     return true;
366 
367 fail:
368     unlink(pidfile);
369     close(pidfd);
370     return false;
371 }
372 #else /* _WIN32 */
373 static bool ga_open_pidfile(const char *pidfile)
374 {
375     return true;
376 }
377 #endif
378 
379 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
380 {
381     return strcmp(str1, str2);
382 }
383 
384 /* disable commands that aren't safe for fsfreeze */
385 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
386 {
387     bool whitelisted = false;
388     int i = 0;
389     const char *name = qmp_command_name(cmd);
390 
391     while (ga_freeze_whitelist[i] != NULL) {
392         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
393             whitelisted = true;
394         }
395         i++;
396     }
397     if (!whitelisted) {
398         g_debug("disabling command: %s", name);
399         qmp_disable_command(&ga_commands, name);
400     }
401 }
402 
403 /* [re-]enable all commands, except those explicitly blacklisted by user */
404 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
405 {
406     GList *blacklist = opaque;
407     const char *name = qmp_command_name(cmd);
408 
409     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
410         !qmp_command_is_enabled(cmd)) {
411         g_debug("enabling command: %s", name);
412         qmp_enable_command(&ga_commands, name);
413     }
414 }
415 
416 static bool ga_create_file(const char *path)
417 {
418     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
419     if (fd == -1) {
420         g_warning("unable to open/create file %s: %s", path, strerror(errno));
421         return false;
422     }
423     close(fd);
424     return true;
425 }
426 
427 static bool ga_delete_file(const char *path)
428 {
429     int ret = unlink(path);
430     if (ret == -1) {
431         g_warning("unable to delete file: %s: %s", path, strerror(errno));
432         return false;
433     }
434 
435     return true;
436 }
437 
438 bool ga_is_frozen(GAState *s)
439 {
440     return s->frozen;
441 }
442 
443 void ga_set_frozen(GAState *s)
444 {
445     if (ga_is_frozen(s)) {
446         return;
447     }
448     /* disable all non-whitelisted (for frozen state) commands */
449     qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
450     g_warning("disabling logging due to filesystem freeze");
451     ga_disable_logging(s);
452     s->frozen = true;
453     if (!ga_create_file(s->state_filepath_isfrozen)) {
454         g_warning("unable to create %s, fsfreeze may not function properly",
455                   s->state_filepath_isfrozen);
456     }
457 }
458 
459 void ga_unset_frozen(GAState *s)
460 {
461     if (!ga_is_frozen(s)) {
462         return;
463     }
464 
465     /* if we delayed creation/opening of pid/log files due to being
466      * in a frozen state at start up, do it now
467      */
468     if (s->deferred_options.log_filepath) {
469         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
470         if (!s->log_file) {
471             s->log_file = stderr;
472         }
473         s->deferred_options.log_filepath = NULL;
474     }
475     ga_enable_logging(s);
476     g_warning("logging re-enabled due to filesystem unfreeze");
477     if (s->deferred_options.pid_filepath) {
478         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
479             g_warning("failed to create/open pid file");
480         }
481         s->deferred_options.pid_filepath = NULL;
482     }
483 
484     /* enable all disabled, non-blacklisted commands */
485     qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
486     s->frozen = false;
487     if (!ga_delete_file(s->state_filepath_isfrozen)) {
488         g_warning("unable to delete %s, fsfreeze may not function properly",
489                   s->state_filepath_isfrozen);
490     }
491 }
492 
493 #ifdef CONFIG_FSFREEZE
494 const char *ga_fsfreeze_hook(GAState *s)
495 {
496     return s->fsfreeze_hook;
497 }
498 #endif
499 
500 static void become_daemon(const char *pidfile)
501 {
502 #ifndef _WIN32
503     pid_t pid, sid;
504 
505     pid = fork();
506     if (pid < 0) {
507         exit(EXIT_FAILURE);
508     }
509     if (pid > 0) {
510         exit(EXIT_SUCCESS);
511     }
512 
513     if (pidfile) {
514         if (!ga_open_pidfile(pidfile)) {
515             g_critical("failed to create pidfile");
516             exit(EXIT_FAILURE);
517         }
518     }
519 
520     umask(S_IRWXG | S_IRWXO);
521     sid = setsid();
522     if (sid < 0) {
523         goto fail;
524     }
525     if ((chdir("/")) < 0) {
526         goto fail;
527     }
528 
529     reopen_fd_to_null(STDIN_FILENO);
530     reopen_fd_to_null(STDOUT_FILENO);
531     reopen_fd_to_null(STDERR_FILENO);
532     return;
533 
534 fail:
535     if (pidfile) {
536         unlink(pidfile);
537     }
538     g_critical("failed to daemonize");
539     exit(EXIT_FAILURE);
540 #endif
541 }
542 
543 static int send_response(GAState *s, QObject *payload)
544 {
545     const char *buf;
546     QString *payload_qstr, *response_qstr;
547     GIOStatus status;
548 
549     g_assert(payload && s->channel);
550 
551     payload_qstr = qobject_to_json(payload);
552     if (!payload_qstr) {
553         return -EINVAL;
554     }
555 
556     if (s->delimit_response) {
557         s->delimit_response = false;
558         response_qstr = qstring_new();
559         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
560         qstring_append(response_qstr, qstring_get_str(payload_qstr));
561         QDECREF(payload_qstr);
562     } else {
563         response_qstr = payload_qstr;
564     }
565 
566     qstring_append_chr(response_qstr, '\n');
567     buf = qstring_get_str(response_qstr);
568     status = ga_channel_write_all(s->channel, buf, strlen(buf));
569     QDECREF(response_qstr);
570     if (status != G_IO_STATUS_NORMAL) {
571         return -EIO;
572     }
573 
574     return 0;
575 }
576 
577 static void process_command(GAState *s, QDict *req)
578 {
579     QObject *rsp = NULL;
580     int ret;
581 
582     g_assert(req);
583     g_debug("processing command");
584     rsp = qmp_dispatch(&ga_commands, QOBJECT(req));
585     if (rsp) {
586         ret = send_response(s, rsp);
587         if (ret < 0) {
588             g_warning("error sending response: %s", strerror(-ret));
589         }
590         qobject_decref(rsp);
591     }
592 }
593 
594 /* handle requests/control events coming in over the channel */
595 static void process_event(JSONMessageParser *parser, GQueue *tokens)
596 {
597     GAState *s = container_of(parser, GAState, parser);
598     QDict *qdict;
599     Error *err = NULL;
600     int ret;
601 
602     g_assert(s && parser);
603 
604     g_debug("process_event: called");
605     qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
606     if (err || !qdict) {
607         QDECREF(qdict);
608         qdict = qdict_new();
609         if (!err) {
610             g_warning("failed to parse event: unknown error");
611             error_setg(&err, QERR_JSON_PARSING);
612         } else {
613             g_warning("failed to parse event: %s", error_get_pretty(err));
614         }
615         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
616         error_free(err);
617     }
618 
619     /* handle host->guest commands */
620     if (qdict_haskey(qdict, "execute")) {
621         process_command(s, qdict);
622     } else {
623         if (!qdict_haskey(qdict, "error")) {
624             QDECREF(qdict);
625             qdict = qdict_new();
626             g_warning("unrecognized payload format");
627             error_setg(&err, QERR_UNSUPPORTED);
628             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
629             error_free(err);
630         }
631         ret = send_response(s, QOBJECT(qdict));
632         if (ret < 0) {
633             g_warning("error sending error response: %s", strerror(-ret));
634         }
635     }
636 
637     QDECREF(qdict);
638 }
639 
640 /* false return signals GAChannel to close the current client connection */
641 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
642 {
643     GAState *s = data;
644     gchar buf[QGA_READ_COUNT_DEFAULT+1];
645     gsize count;
646     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
647     switch (status) {
648     case G_IO_STATUS_ERROR:
649         g_warning("error reading channel");
650         return false;
651     case G_IO_STATUS_NORMAL:
652         buf[count] = 0;
653         g_debug("read data, count: %d, data: %s", (int)count, buf);
654         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
655         break;
656     case G_IO_STATUS_EOF:
657         g_debug("received EOF");
658         if (!s->virtio) {
659             return false;
660         }
661         /* fall through */
662     case G_IO_STATUS_AGAIN:
663         /* virtio causes us to spin here when no process is attached to
664          * host-side chardev. sleep a bit to mitigate this
665          */
666         if (s->virtio) {
667             usleep(100*1000);
668         }
669         return true;
670     default:
671         g_warning("unknown channel read status, closing");
672         return false;
673     }
674     return true;
675 }
676 
677 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
678                              int listen_fd)
679 {
680     GAChannelMethod channel_method;
681 
682     if (strcmp(method, "virtio-serial") == 0) {
683         s->virtio = true; /* virtio requires special handling in some cases */
684         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
685     } else if (strcmp(method, "isa-serial") == 0) {
686         channel_method = GA_CHANNEL_ISA_SERIAL;
687     } else if (strcmp(method, "unix-listen") == 0) {
688         channel_method = GA_CHANNEL_UNIX_LISTEN;
689     } else if (strcmp(method, "vsock-listen") == 0) {
690         channel_method = GA_CHANNEL_VSOCK_LISTEN;
691     } else {
692         g_critical("unsupported channel method/type: %s", method);
693         return false;
694     }
695 
696     s->channel = ga_channel_new(channel_method, path, listen_fd,
697                                 channel_event_cb, s);
698     if (!s->channel) {
699         g_critical("failed to create guest agent channel");
700         return false;
701     }
702 
703     return true;
704 }
705 
706 #ifdef _WIN32
707 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
708                                   LPVOID ctx)
709 {
710     DWORD ret = NO_ERROR;
711     GAService *service = &ga_state->service;
712 
713     switch (ctrl)
714     {
715         case SERVICE_CONTROL_STOP:
716         case SERVICE_CONTROL_SHUTDOWN:
717             quit_handler(SIGTERM);
718             service->status.dwCurrentState = SERVICE_STOP_PENDING;
719             SetServiceStatus(service->status_handle, &service->status);
720             break;
721 
722         default:
723             ret = ERROR_CALL_NOT_IMPLEMENTED;
724     }
725     return ret;
726 }
727 
728 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
729 {
730     GAService *service = &ga_state->service;
731 
732     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
733         service_ctrl_handler, NULL);
734 
735     if (service->status_handle == 0) {
736         g_critical("Failed to register extended requests function!\n");
737         return;
738     }
739 
740     service->status.dwServiceType = SERVICE_WIN32;
741     service->status.dwCurrentState = SERVICE_RUNNING;
742     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
743     service->status.dwWin32ExitCode = NO_ERROR;
744     service->status.dwServiceSpecificExitCode = NO_ERROR;
745     service->status.dwCheckPoint = 0;
746     service->status.dwWaitHint = 0;
747     SetServiceStatus(service->status_handle, &service->status);
748 
749     g_main_loop_run(ga_state->main_loop);
750 
751     service->status.dwCurrentState = SERVICE_STOPPED;
752     SetServiceStatus(service->status_handle, &service->status);
753 }
754 #endif
755 
756 static void set_persistent_state_defaults(GAPersistentState *pstate)
757 {
758     g_assert(pstate);
759     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
760 }
761 
762 static void persistent_state_from_keyfile(GAPersistentState *pstate,
763                                           GKeyFile *keyfile)
764 {
765     g_assert(pstate);
766     g_assert(keyfile);
767     /* if any fields are missing, either because the file was tampered with
768      * by agents of chaos, or because the field wasn't present at the time the
769      * file was created, the best we can ever do is start over with the default
770      * values. so load them now, and ignore any errors in accessing key-value
771      * pairs
772      */
773     set_persistent_state_defaults(pstate);
774 
775     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
776         pstate->fd_counter =
777             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
778     }
779 }
780 
781 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
782                                         GKeyFile *keyfile)
783 {
784     g_assert(pstate);
785     g_assert(keyfile);
786 
787     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
788 }
789 
790 static gboolean write_persistent_state(const GAPersistentState *pstate,
791                                        const gchar *path)
792 {
793     GKeyFile *keyfile = g_key_file_new();
794     GError *gerr = NULL;
795     gboolean ret = true;
796     gchar *data = NULL;
797     gsize data_len;
798 
799     g_assert(pstate);
800 
801     persistent_state_to_keyfile(pstate, keyfile);
802     data = g_key_file_to_data(keyfile, &data_len, &gerr);
803     if (gerr) {
804         g_critical("failed to convert persistent state to string: %s",
805                    gerr->message);
806         ret = false;
807         goto out;
808     }
809 
810     g_file_set_contents(path, data, data_len, &gerr);
811     if (gerr) {
812         g_critical("failed to write persistent state to %s: %s",
813                     path, gerr->message);
814         ret = false;
815         goto out;
816     }
817 
818 out:
819     if (gerr) {
820         g_error_free(gerr);
821     }
822     if (keyfile) {
823         g_key_file_free(keyfile);
824     }
825     g_free(data);
826     return ret;
827 }
828 
829 static gboolean read_persistent_state(GAPersistentState *pstate,
830                                       const gchar *path, gboolean frozen)
831 {
832     GKeyFile *keyfile = NULL;
833     GError *gerr = NULL;
834     struct stat st;
835     gboolean ret = true;
836 
837     g_assert(pstate);
838 
839     if (stat(path, &st) == -1) {
840         /* it's okay if state file doesn't exist, but any other error
841          * indicates a permissions issue or some other misconfiguration
842          * that we likely won't be able to recover from.
843          */
844         if (errno != ENOENT) {
845             g_critical("unable to access state file at path %s: %s",
846                        path, strerror(errno));
847             ret = false;
848             goto out;
849         }
850 
851         /* file doesn't exist. initialize state to default values and
852          * attempt to save now. (we could wait till later when we have
853          * modified state we need to commit, but if there's a problem,
854          * such as a missing parent directory, we want to catch it now)
855          *
856          * there is a potential scenario where someone either managed to
857          * update the agent from a version that didn't use a key store
858          * while qemu-ga thought the filesystem was frozen, or
859          * deleted the key store prior to issuing a fsfreeze, prior
860          * to restarting the agent. in this case we go ahead and defer
861          * initial creation till we actually have modified state to
862          * write, otherwise fail to recover from freeze.
863          */
864         set_persistent_state_defaults(pstate);
865         if (!frozen) {
866             ret = write_persistent_state(pstate, path);
867             if (!ret) {
868                 g_critical("unable to create state file at path %s", path);
869                 ret = false;
870                 goto out;
871             }
872         }
873         ret = true;
874         goto out;
875     }
876 
877     keyfile = g_key_file_new();
878     g_key_file_load_from_file(keyfile, path, 0, &gerr);
879     if (gerr) {
880         g_critical("error loading persistent state from path: %s, %s",
881                    path, gerr->message);
882         ret = false;
883         goto out;
884     }
885 
886     persistent_state_from_keyfile(pstate, keyfile);
887 
888 out:
889     if (keyfile) {
890         g_key_file_free(keyfile);
891     }
892     if (gerr) {
893         g_error_free(gerr);
894     }
895 
896     return ret;
897 }
898 
899 int64_t ga_get_fd_handle(GAState *s, Error **errp)
900 {
901     int64_t handle;
902 
903     g_assert(s->pstate_filepath);
904     /* we blacklist commands and avoid operations that potentially require
905      * writing to disk when we're in a frozen state. this includes opening
906      * new files, so we should never get here in that situation
907      */
908     g_assert(!ga_is_frozen(s));
909 
910     handle = s->pstate.fd_counter++;
911 
912     /* This should never happen on a reasonable timeframe, as guest-file-open
913      * would have to be issued 2^63 times */
914     if (s->pstate.fd_counter == INT64_MAX) {
915         abort();
916     }
917 
918     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
919         error_setg(errp, "failed to commit persistent state to disk");
920         return -1;
921     }
922 
923     return handle;
924 }
925 
926 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
927 {
928     printf("%s\n", qmp_command_name(cmd));
929 }
930 
931 static GList *split_list(const gchar *str, const gchar *delim)
932 {
933     GList *list = NULL;
934     int i;
935     gchar **strv;
936 
937     strv = g_strsplit(str, delim, -1);
938     for (i = 0; strv[i]; i++) {
939         list = g_list_prepend(list, strv[i]);
940     }
941     g_free(strv);
942 
943     return list;
944 }
945 
946 typedef struct GAConfig {
947     char *channel_path;
948     char *method;
949     char *log_filepath;
950     char *pid_filepath;
951 #ifdef CONFIG_FSFREEZE
952     char *fsfreeze_hook;
953 #endif
954     char *state_dir;
955 #ifdef _WIN32
956     const char *service;
957 #endif
958     gchar *bliststr; /* blacklist may point to this string */
959     GList *blacklist;
960     int daemonize;
961     GLogLevelFlags log_level;
962     int dumpconf;
963 } GAConfig;
964 
965 static void config_load(GAConfig *config)
966 {
967     GError *gerr = NULL;
968     GKeyFile *keyfile;
969     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
970 
971     /* read system config */
972     keyfile = g_key_file_new();
973     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
974         goto end;
975     }
976     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
977         config->daemonize =
978             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
979     }
980     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
981         config->method =
982             g_key_file_get_string(keyfile, "general", "method", &gerr);
983     }
984     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
985         config->channel_path =
986             g_key_file_get_string(keyfile, "general", "path", &gerr);
987     }
988     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
989         config->log_filepath =
990             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
991     }
992     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
993         config->pid_filepath =
994             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
995     }
996 #ifdef CONFIG_FSFREEZE
997     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
998         config->fsfreeze_hook =
999             g_key_file_get_string(keyfile,
1000                                   "general", "fsfreeze-hook", &gerr);
1001     }
1002 #endif
1003     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
1004         config->state_dir =
1005             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1006     }
1007     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1008         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1009         /* enable all log levels */
1010         config->log_level = G_LOG_LEVEL_MASK;
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     tmp = list_join(config->blacklist, ',');
1074     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1075     g_free(tmp);
1076 
1077     tmp = g_key_file_to_data(keyfile, NULL, &error);
1078     printf("%s", tmp);
1079 
1080     g_free(tmp);
1081     g_key_file_free(keyfile);
1082 }
1083 
1084 static void config_parse(GAConfig *config, int argc, char **argv)
1085 {
1086     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1087     int opt_ind = 0, ch;
1088     const struct option lopt[] = {
1089         { "help", 0, NULL, 'h' },
1090         { "version", 0, NULL, 'V' },
1091         { "dump-conf", 0, NULL, 'D' },
1092         { "logfile", 1, NULL, 'l' },
1093         { "pidfile", 1, NULL, 'f' },
1094 #ifdef CONFIG_FSFREEZE
1095         { "fsfreeze-hook", 2, NULL, 'F' },
1096 #endif
1097         { "verbose", 0, NULL, 'v' },
1098         { "method", 1, NULL, 'm' },
1099         { "path", 1, NULL, 'p' },
1100         { "daemonize", 0, NULL, 'd' },
1101         { "blacklist", 1, NULL, 'b' },
1102 #ifdef _WIN32
1103         { "service", 1, NULL, 's' },
1104 #endif
1105         { "statedir", 1, NULL, 't' },
1106         { NULL, 0, NULL, 0 }
1107     };
1108 
1109     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1110         switch (ch) {
1111         case 'm':
1112             g_free(config->method);
1113             config->method = g_strdup(optarg);
1114             break;
1115         case 'p':
1116             g_free(config->channel_path);
1117             config->channel_path = g_strdup(optarg);
1118             break;
1119         case 'l':
1120             g_free(config->log_filepath);
1121             config->log_filepath = g_strdup(optarg);
1122             break;
1123         case 'f':
1124             g_free(config->pid_filepath);
1125             config->pid_filepath = g_strdup(optarg);
1126             break;
1127 #ifdef CONFIG_FSFREEZE
1128         case 'F':
1129             g_free(config->fsfreeze_hook);
1130             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1131             break;
1132 #endif
1133         case 't':
1134             g_free(config->state_dir);
1135             config->state_dir = g_strdup(optarg);
1136             break;
1137         case 'v':
1138             /* enable all log levels */
1139             config->log_level = G_LOG_LEVEL_MASK;
1140             break;
1141         case 'V':
1142             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1143             exit(EXIT_SUCCESS);
1144         case 'd':
1145             config->daemonize = 1;
1146             break;
1147         case 'D':
1148             config->dumpconf = 1;
1149             break;
1150         case 'b': {
1151             if (is_help_option(optarg)) {
1152                 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1153                 exit(EXIT_SUCCESS);
1154             }
1155             config->blacklist = g_list_concat(config->blacklist,
1156                                              split_list(optarg, ","));
1157             break;
1158         }
1159 #ifdef _WIN32
1160         case 's':
1161             config->service = optarg;
1162             if (strcmp(config->service, "install") == 0) {
1163                 if (ga_install_vss_provider()) {
1164                     exit(EXIT_FAILURE);
1165                 }
1166                 if (ga_install_service(config->channel_path,
1167                                        config->log_filepath, config->state_dir)) {
1168                     exit(EXIT_FAILURE);
1169                 }
1170                 exit(EXIT_SUCCESS);
1171             } else if (strcmp(config->service, "uninstall") == 0) {
1172                 ga_uninstall_vss_provider();
1173                 exit(ga_uninstall_service());
1174             } else if (strcmp(config->service, "vss-install") == 0) {
1175                 if (ga_install_vss_provider()) {
1176                     exit(EXIT_FAILURE);
1177                 }
1178                 exit(EXIT_SUCCESS);
1179             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1180                 ga_uninstall_vss_provider();
1181                 exit(EXIT_SUCCESS);
1182             } else {
1183                 printf("Unknown service command.\n");
1184                 exit(EXIT_FAILURE);
1185             }
1186             break;
1187 #endif
1188         case 'h':
1189             usage(argv[0]);
1190             exit(EXIT_SUCCESS);
1191         case '?':
1192             g_print("Unknown option, try '%s --help' for more information.\n",
1193                     argv[0]);
1194             exit(EXIT_FAILURE);
1195         }
1196     }
1197 }
1198 
1199 static void config_free(GAConfig *config)
1200 {
1201     g_free(config->method);
1202     g_free(config->log_filepath);
1203     g_free(config->pid_filepath);
1204     g_free(config->state_dir);
1205     g_free(config->channel_path);
1206     g_free(config->bliststr);
1207 #ifdef CONFIG_FSFREEZE
1208     g_free(config->fsfreeze_hook);
1209 #endif
1210     g_list_free_full(config->blacklist, g_free);
1211     g_free(config);
1212 }
1213 
1214 static bool check_is_frozen(GAState *s)
1215 {
1216 #ifndef _WIN32
1217     /* check if a previous instance of qemu-ga exited with filesystems' state
1218      * marked as frozen. this could be a stale value (a non-qemu-ga process
1219      * or reboot may have since unfrozen them), but better to require an
1220      * uneeded unfreeze than to risk hanging on start-up
1221      */
1222     struct stat st;
1223     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1224         /* it's okay if the file doesn't exist, but if we can't access for
1225          * some other reason, such as permissions, there's a configuration
1226          * that needs to be addressed. so just bail now before we get into
1227          * more trouble later
1228          */
1229         if (errno != ENOENT) {
1230             g_critical("unable to access state file at path %s: %s",
1231                        s->state_filepath_isfrozen, strerror(errno));
1232             return EXIT_FAILURE;
1233         }
1234     } else {
1235         g_warning("previous instance appears to have exited with frozen"
1236                   " filesystems. deferring logging/pidfile creation and"
1237                   " disabling non-fsfreeze-safe commands until"
1238                   " guest-fsfreeze-thaw is issued, or filesystems are"
1239                   " manually unfrozen and the file %s is removed",
1240                   s->state_filepath_isfrozen);
1241         return true;
1242     }
1243 #endif
1244     return false;
1245 }
1246 
1247 static int run_agent(GAState *s, GAConfig *config, int socket_activation)
1248 {
1249     ga_state = s;
1250 
1251     g_log_set_default_handler(ga_log, s);
1252     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1253     ga_enable_logging(s);
1254 
1255 #ifdef _WIN32
1256     /* On win32 the state directory is application specific (be it the default
1257      * or a user override). We got past the command line parsing; let's create
1258      * the directory (with any intermediate directories). If we run into an
1259      * error later on, we won't try to clean up the directory, it is considered
1260      * persistent.
1261      */
1262     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1263         g_critical("unable to create (an ancestor of) the state directory"
1264                    " '%s': %s", config->state_dir, strerror(errno));
1265         return EXIT_FAILURE;
1266     }
1267 #endif
1268 
1269     if (ga_is_frozen(s)) {
1270         if (config->daemonize) {
1271             /* delay opening/locking of pidfile till filesystems are unfrozen */
1272             s->deferred_options.pid_filepath = config->pid_filepath;
1273             become_daemon(NULL);
1274         }
1275         if (config->log_filepath) {
1276             /* delay opening the log file till filesystems are unfrozen */
1277             s->deferred_options.log_filepath = config->log_filepath;
1278         }
1279         ga_disable_logging(s);
1280         qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1281     } else {
1282         if (config->daemonize) {
1283             become_daemon(config->pid_filepath);
1284         }
1285         if (config->log_filepath) {
1286             FILE *log_file = ga_open_logfile(config->log_filepath);
1287             if (!log_file) {
1288                 g_critical("unable to open specified log file: %s",
1289                            strerror(errno));
1290                 return EXIT_FAILURE;
1291             }
1292             s->log_file = log_file;
1293         }
1294     }
1295 
1296     /* load persistent state from disk */
1297     if (!read_persistent_state(&s->pstate,
1298                                s->pstate_filepath,
1299                                ga_is_frozen(s))) {
1300         g_critical("failed to load persistent state");
1301         return EXIT_FAILURE;
1302     }
1303 
1304     config->blacklist = ga_command_blacklist_init(config->blacklist);
1305     if (config->blacklist) {
1306         GList *l = config->blacklist;
1307         s->blacklist = config->blacklist;
1308         do {
1309             g_debug("disabling command: %s", (char *)l->data);
1310             qmp_disable_command(&ga_commands, l->data);
1311             l = g_list_next(l);
1312         } while (l);
1313     }
1314     s->command_state = ga_command_state_new();
1315     ga_command_state_init(s, s->command_state);
1316     ga_command_state_init_all(s->command_state);
1317     json_message_parser_init(&s->parser, process_event);
1318     ga_state = s;
1319 #ifndef _WIN32
1320     if (!register_signal_handlers()) {
1321         g_critical("failed to register signal handlers");
1322         return EXIT_FAILURE;
1323     }
1324 #endif
1325 
1326     s->main_loop = g_main_loop_new(NULL, false);
1327 
1328     if (!channel_init(ga_state, config->method, config->channel_path,
1329                       socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1330         g_critical("failed to initialize guest agent channel");
1331         return EXIT_FAILURE;
1332     }
1333 #ifndef _WIN32
1334     g_main_loop_run(ga_state->main_loop);
1335 #else
1336     if (config->daemonize) {
1337         SERVICE_TABLE_ENTRY service_table[] = {
1338             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1339         StartServiceCtrlDispatcher(service_table);
1340     } else {
1341         g_main_loop_run(ga_state->main_loop);
1342     }
1343 #endif
1344 
1345     return EXIT_SUCCESS;
1346 }
1347 
1348 int main(int argc, char **argv)
1349 {
1350     int ret = EXIT_SUCCESS;
1351     GAState *s = g_new0(GAState, 1);
1352     GAConfig *config = g_new0(GAConfig, 1);
1353     int socket_activation;
1354 
1355     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1356 
1357     qga_qmp_init_marshal(&ga_commands);
1358 
1359     init_dfl_pathnames();
1360     config_load(config);
1361     config_parse(config, argc, argv);
1362 
1363     if (config->pid_filepath == NULL) {
1364         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1365     }
1366 
1367     if (config->state_dir == NULL) {
1368         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1369     }
1370 
1371     if (config->method == NULL) {
1372         config->method = g_strdup("virtio-serial");
1373     }
1374 
1375     socket_activation = check_socket_activation();
1376     if (socket_activation > 1) {
1377         g_critical("qemu-ga only supports listening on one socket");
1378         ret = EXIT_FAILURE;
1379         goto end;
1380     }
1381     if (socket_activation) {
1382         SocketAddress *addr;
1383 
1384         g_free(config->method);
1385         g_free(config->channel_path);
1386         config->method = NULL;
1387         config->channel_path = NULL;
1388 
1389         addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1390         if (addr) {
1391             if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1392                 config->method = g_strdup("unix-listen");
1393             } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1394                 config->method = g_strdup("vsock-listen");
1395             }
1396 
1397             qapi_free_SocketAddress(addr);
1398         }
1399 
1400         if (!config->method) {
1401             g_critical("unsupported listen fd type");
1402             ret = EXIT_FAILURE;
1403             goto end;
1404         }
1405     } else if (config->channel_path == NULL) {
1406         if (strcmp(config->method, "virtio-serial") == 0) {
1407             /* try the default path for the virtio-serial port */
1408             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1409         } else if (strcmp(config->method, "isa-serial") == 0) {
1410             /* try the default path for the serial port - COM1 */
1411             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1412         } else {
1413             g_critical("must specify a path for this channel");
1414             ret = EXIT_FAILURE;
1415             goto end;
1416         }
1417     }
1418 
1419     s->log_level = config->log_level;
1420     s->log_file = stderr;
1421 #ifdef CONFIG_FSFREEZE
1422     s->fsfreeze_hook = config->fsfreeze_hook;
1423 #endif
1424     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1425     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1426                                                  config->state_dir);
1427     s->frozen = check_is_frozen(s);
1428 
1429     if (config->dumpconf) {
1430         config_dump(config);
1431         goto end;
1432     }
1433 
1434     ret = run_agent(s, config, socket_activation);
1435 
1436 end:
1437     if (s->command_state) {
1438         ga_command_state_cleanup_all(s->command_state);
1439         ga_command_state_free(s->command_state);
1440         json_message_parser_destroy(&s->parser);
1441     }
1442     if (s->channel) {
1443         ga_channel_free(s->channel);
1444     }
1445     g_free(s->pstate_filepath);
1446     g_free(s->state_filepath_isfrozen);
1447 
1448     if (config->daemonize) {
1449         unlink(config->pid_filepath);
1450     }
1451 
1452     config_free(config);
1453     if (s->main_loop) {
1454         g_main_loop_unref(s->main_loop);
1455     }
1456     g_free(s);
1457 
1458     return ret;
1459 }
1460