xref: /openbmc/qemu/qga/main.c (revision 80adf54e)
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/qjson.h"
23 #include "qga/guest-agent-core.h"
24 #include "qemu/module.h"
25 #include "qapi/qmp/qerror.h"
26 #include "qapi/qmp/dispatch.h"
27 #include "qga/channel.h"
28 #include "qemu/bswap.h"
29 #include "qemu/help_option.h"
30 #include "qemu/sockets.h"
31 #include "qemu/systemd.h"
32 #include "qemu-version.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 " QEMU_VERSION QEMU_PKGVERSION "\n"
218 QEMU_COPYRIGHT "\n"
219 "\n"
220 "  -m, --method      transport method: one of unix-listen, virtio-serial,\n"
221 "                    isa-serial, or vsock-listen (virtio-serial is the default)\n"
222 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
223 "                    %s,\n"
224 "                    the default for isa-serial is:\n"
225 "                    %s)\n"
226 "  -l, --logfile     set logfile path, logs to stderr by default\n"
227 "  -f, --pidfile     specify pidfile (default is %s)\n"
228 #ifdef CONFIG_FSFREEZE
229 "  -F, --fsfreeze-hook\n"
230 "                    enable fsfreeze hook. Accepts an optional argument that\n"
231 "                    specifies script to run on freeze/thaw. Script will be\n"
232 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
233 "                    (default is %s)\n"
234 "                    If using -F with an argument, do not follow -F with a\n"
235 "                    space.\n"
236 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
237 #endif
238 "  -t, --statedir    specify dir to store state information (absolute paths\n"
239 "                    only, default is %s)\n"
240 "  -v, --verbose     log extra debugging information\n"
241 "  -V, --version     print version information and exit\n"
242 "  -d, --daemonize   become a daemon\n"
243 #ifdef _WIN32
244 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
245 #endif
246 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
247 "                    to list available RPCs)\n"
248 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
249 "                    options / command-line parameters to stdout\n"
250 "  -h, --help        display this help and exit\n"
251 "\n"
252 QEMU_HELP_BOTTOM "\n"
253     , cmd, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
254     dfl_pathnames.pidfile,
255 #ifdef CONFIG_FSFREEZE
256     QGA_FSFREEZE_HOOK_DEFAULT,
257 #endif
258     dfl_pathnames.state_dir);
259 }
260 
261 static const char *ga_log_level_str(GLogLevelFlags level)
262 {
263     switch (level & G_LOG_LEVEL_MASK) {
264         case G_LOG_LEVEL_ERROR:
265             return "error";
266         case G_LOG_LEVEL_CRITICAL:
267             return "critical";
268         case G_LOG_LEVEL_WARNING:
269             return "warning";
270         case G_LOG_LEVEL_MESSAGE:
271             return "message";
272         case G_LOG_LEVEL_INFO:
273             return "info";
274         case G_LOG_LEVEL_DEBUG:
275             return "debug";
276         default:
277             return "user";
278     }
279 }
280 
281 bool ga_logging_enabled(GAState *s)
282 {
283     return s->logging_enabled;
284 }
285 
286 void ga_disable_logging(GAState *s)
287 {
288     s->logging_enabled = false;
289 }
290 
291 void ga_enable_logging(GAState *s)
292 {
293     s->logging_enabled = true;
294 }
295 
296 static void ga_log(const gchar *domain, GLogLevelFlags level,
297                    const gchar *msg, gpointer opaque)
298 {
299     GAState *s = opaque;
300     GTimeVal time;
301     const char *level_str = ga_log_level_str(level);
302 
303     if (!ga_logging_enabled(s)) {
304         return;
305     }
306 
307     level &= G_LOG_LEVEL_MASK;
308 #ifndef _WIN32
309     if (g_strcmp0(domain, "syslog") == 0) {
310         syslog(LOG_INFO, "%s: %s", level_str, msg);
311     } else if (level & s->log_level) {
312 #else
313     if (level & s->log_level) {
314 #endif
315         g_get_current_time(&time);
316         fprintf(s->log_file,
317                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
318         fflush(s->log_file);
319     }
320 }
321 
322 void ga_set_response_delimited(GAState *s)
323 {
324     s->delimit_response = true;
325 }
326 
327 static FILE *ga_open_logfile(const char *logfile)
328 {
329     FILE *f;
330 
331     f = fopen(logfile, "a");
332     if (!f) {
333         return NULL;
334     }
335 
336     qemu_set_cloexec(fileno(f));
337     return f;
338 }
339 
340 #ifndef _WIN32
341 static bool ga_open_pidfile(const char *pidfile)
342 {
343     int pidfd;
344     char pidstr[32];
345 
346     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
347     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
348         g_critical("Cannot lock pid file, %s", strerror(errno));
349         if (pidfd != -1) {
350             close(pidfd);
351         }
352         return false;
353     }
354 
355     if (ftruncate(pidfd, 0)) {
356         g_critical("Failed to truncate pid file");
357         goto fail;
358     }
359     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
360     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
361         g_critical("Failed to write pid file");
362         goto fail;
363     }
364 
365     /* keep pidfile open & locked forever */
366     return true;
367 
368 fail:
369     unlink(pidfile);
370     close(pidfd);
371     return false;
372 }
373 #else /* _WIN32 */
374 static bool ga_open_pidfile(const char *pidfile)
375 {
376     return true;
377 }
378 #endif
379 
380 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
381 {
382     return strcmp(str1, str2);
383 }
384 
385 /* disable commands that aren't safe for fsfreeze */
386 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
387 {
388     bool whitelisted = false;
389     int i = 0;
390     const char *name = qmp_command_name(cmd);
391 
392     while (ga_freeze_whitelist[i] != NULL) {
393         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
394             whitelisted = true;
395         }
396         i++;
397     }
398     if (!whitelisted) {
399         g_debug("disabling command: %s", name);
400         qmp_disable_command(&ga_commands, name);
401     }
402 }
403 
404 /* [re-]enable all commands, except those explicitly blacklisted by user */
405 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
406 {
407     GList *blacklist = opaque;
408     const char *name = qmp_command_name(cmd);
409 
410     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
411         !qmp_command_is_enabled(cmd)) {
412         g_debug("enabling command: %s", name);
413         qmp_enable_command(&ga_commands, name);
414     }
415 }
416 
417 static bool ga_create_file(const char *path)
418 {
419     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
420     if (fd == -1) {
421         g_warning("unable to open/create file %s: %s", path, strerror(errno));
422         return false;
423     }
424     close(fd);
425     return true;
426 }
427 
428 static bool ga_delete_file(const char *path)
429 {
430     int ret = unlink(path);
431     if (ret == -1) {
432         g_warning("unable to delete file: %s: %s", path, strerror(errno));
433         return false;
434     }
435 
436     return true;
437 }
438 
439 bool ga_is_frozen(GAState *s)
440 {
441     return s->frozen;
442 }
443 
444 void ga_set_frozen(GAState *s)
445 {
446     if (ga_is_frozen(s)) {
447         return;
448     }
449     /* disable all non-whitelisted (for frozen state) commands */
450     qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
451     g_warning("disabling logging due to filesystem freeze");
452     ga_disable_logging(s);
453     s->frozen = true;
454     if (!ga_create_file(s->state_filepath_isfrozen)) {
455         g_warning("unable to create %s, fsfreeze may not function properly",
456                   s->state_filepath_isfrozen);
457     }
458 }
459 
460 void ga_unset_frozen(GAState *s)
461 {
462     if (!ga_is_frozen(s)) {
463         return;
464     }
465 
466     /* if we delayed creation/opening of pid/log files due to being
467      * in a frozen state at start up, do it now
468      */
469     if (s->deferred_options.log_filepath) {
470         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
471         if (!s->log_file) {
472             s->log_file = stderr;
473         }
474         s->deferred_options.log_filepath = NULL;
475     }
476     ga_enable_logging(s);
477     g_warning("logging re-enabled due to filesystem unfreeze");
478     if (s->deferred_options.pid_filepath) {
479         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
480             g_warning("failed to create/open pid file");
481         }
482         s->deferred_options.pid_filepath = NULL;
483     }
484 
485     /* enable all disabled, non-blacklisted commands */
486     qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
487     s->frozen = false;
488     if (!ga_delete_file(s->state_filepath_isfrozen)) {
489         g_warning("unable to delete %s, fsfreeze may not function properly",
490                   s->state_filepath_isfrozen);
491     }
492 }
493 
494 #ifdef CONFIG_FSFREEZE
495 const char *ga_fsfreeze_hook(GAState *s)
496 {
497     return s->fsfreeze_hook;
498 }
499 #endif
500 
501 static void become_daemon(const char *pidfile)
502 {
503 #ifndef _WIN32
504     pid_t pid, sid;
505 
506     pid = fork();
507     if (pid < 0) {
508         exit(EXIT_FAILURE);
509     }
510     if (pid > 0) {
511         exit(EXIT_SUCCESS);
512     }
513 
514     if (pidfile) {
515         if (!ga_open_pidfile(pidfile)) {
516             g_critical("failed to create pidfile");
517             exit(EXIT_FAILURE);
518         }
519     }
520 
521     umask(S_IRWXG | S_IRWXO);
522     sid = setsid();
523     if (sid < 0) {
524         goto fail;
525     }
526     if ((chdir("/")) < 0) {
527         goto fail;
528     }
529 
530     reopen_fd_to_null(STDIN_FILENO);
531     reopen_fd_to_null(STDOUT_FILENO);
532     reopen_fd_to_null(STDERR_FILENO);
533     return;
534 
535 fail:
536     if (pidfile) {
537         unlink(pidfile);
538     }
539     g_critical("failed to daemonize");
540     exit(EXIT_FAILURE);
541 #endif
542 }
543 
544 static int send_response(GAState *s, QObject *payload)
545 {
546     const char *buf;
547     QString *payload_qstr, *response_qstr;
548     GIOStatus status;
549 
550     g_assert(payload && s->channel);
551 
552     payload_qstr = qobject_to_json(payload);
553     if (!payload_qstr) {
554         return -EINVAL;
555     }
556 
557     if (s->delimit_response) {
558         s->delimit_response = false;
559         response_qstr = qstring_new();
560         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
561         qstring_append(response_qstr, qstring_get_str(payload_qstr));
562         QDECREF(payload_qstr);
563     } else {
564         response_qstr = payload_qstr;
565     }
566 
567     qstring_append_chr(response_qstr, '\n');
568     buf = qstring_get_str(response_qstr);
569     status = ga_channel_write_all(s->channel, buf, strlen(buf));
570     QDECREF(response_qstr);
571     if (status != G_IO_STATUS_NORMAL) {
572         return -EIO;
573     }
574 
575     return 0;
576 }
577 
578 static void process_command(GAState *s, QDict *req)
579 {
580     QObject *rsp = NULL;
581     int ret;
582 
583     g_assert(req);
584     g_debug("processing command");
585     rsp = qmp_dispatch(&ga_commands, QOBJECT(req));
586     if (rsp) {
587         ret = send_response(s, rsp);
588         if (ret < 0) {
589             g_warning("error sending response: %s", strerror(-ret));
590         }
591         qobject_decref(rsp);
592     }
593 }
594 
595 /* handle requests/control events coming in over the channel */
596 static void process_event(JSONMessageParser *parser, GQueue *tokens)
597 {
598     GAState *s = container_of(parser, GAState, parser);
599     QDict *qdict;
600     Error *err = NULL;
601     int ret;
602 
603     g_assert(s && parser);
604 
605     g_debug("process_event: called");
606     qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
607     if (err || !qdict) {
608         QDECREF(qdict);
609         qdict = qdict_new();
610         if (!err) {
611             g_warning("failed to parse event: unknown error");
612             error_setg(&err, QERR_JSON_PARSING);
613         } else {
614             g_warning("failed to parse event: %s", error_get_pretty(err));
615         }
616         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
617         error_free(err);
618     }
619 
620     /* handle host->guest commands */
621     if (qdict_haskey(qdict, "execute")) {
622         process_command(s, qdict);
623     } else {
624         if (!qdict_haskey(qdict, "error")) {
625             QDECREF(qdict);
626             qdict = qdict_new();
627             g_warning("unrecognized payload format");
628             error_setg(&err, QERR_UNSUPPORTED);
629             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
630             error_free(err);
631         }
632         ret = send_response(s, QOBJECT(qdict));
633         if (ret < 0) {
634             g_warning("error sending error response: %s", strerror(-ret));
635         }
636     }
637 
638     QDECREF(qdict);
639 }
640 
641 /* false return signals GAChannel to close the current client connection */
642 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
643 {
644     GAState *s = data;
645     gchar buf[QGA_READ_COUNT_DEFAULT+1];
646     gsize count;
647     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
648     switch (status) {
649     case G_IO_STATUS_ERROR:
650         g_warning("error reading channel");
651         return false;
652     case G_IO_STATUS_NORMAL:
653         buf[count] = 0;
654         g_debug("read data, count: %d, data: %s", (int)count, buf);
655         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
656         break;
657     case G_IO_STATUS_EOF:
658         g_debug("received EOF");
659         if (!s->virtio) {
660             return false;
661         }
662         /* fall through */
663     case G_IO_STATUS_AGAIN:
664         /* virtio causes us to spin here when no process is attached to
665          * host-side chardev. sleep a bit to mitigate this
666          */
667         if (s->virtio) {
668             usleep(100*1000);
669         }
670         return true;
671     default:
672         g_warning("unknown channel read status, closing");
673         return false;
674     }
675     return true;
676 }
677 
678 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
679                              int listen_fd)
680 {
681     GAChannelMethod channel_method;
682 
683     if (strcmp(method, "virtio-serial") == 0) {
684         s->virtio = true; /* virtio requires special handling in some cases */
685         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
686     } else if (strcmp(method, "isa-serial") == 0) {
687         channel_method = GA_CHANNEL_ISA_SERIAL;
688     } else if (strcmp(method, "unix-listen") == 0) {
689         channel_method = GA_CHANNEL_UNIX_LISTEN;
690     } else if (strcmp(method, "vsock-listen") == 0) {
691         channel_method = GA_CHANNEL_VSOCK_LISTEN;
692     } else {
693         g_critical("unsupported channel method/type: %s", method);
694         return false;
695     }
696 
697     s->channel = ga_channel_new(channel_method, path, listen_fd,
698                                 channel_event_cb, s);
699     if (!s->channel) {
700         g_critical("failed to create guest agent channel");
701         return false;
702     }
703 
704     return true;
705 }
706 
707 #ifdef _WIN32
708 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
709                                   LPVOID ctx)
710 {
711     DWORD ret = NO_ERROR;
712     GAService *service = &ga_state->service;
713 
714     switch (ctrl)
715     {
716         case SERVICE_CONTROL_STOP:
717         case SERVICE_CONTROL_SHUTDOWN:
718             quit_handler(SIGTERM);
719             service->status.dwCurrentState = SERVICE_STOP_PENDING;
720             SetServiceStatus(service->status_handle, &service->status);
721             break;
722 
723         default:
724             ret = ERROR_CALL_NOT_IMPLEMENTED;
725     }
726     return ret;
727 }
728 
729 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
730 {
731     GAService *service = &ga_state->service;
732 
733     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
734         service_ctrl_handler, NULL);
735 
736     if (service->status_handle == 0) {
737         g_critical("Failed to register extended requests function!\n");
738         return;
739     }
740 
741     service->status.dwServiceType = SERVICE_WIN32;
742     service->status.dwCurrentState = SERVICE_RUNNING;
743     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
744     service->status.dwWin32ExitCode = NO_ERROR;
745     service->status.dwServiceSpecificExitCode = NO_ERROR;
746     service->status.dwCheckPoint = 0;
747     service->status.dwWaitHint = 0;
748     SetServiceStatus(service->status_handle, &service->status);
749 
750     g_main_loop_run(ga_state->main_loop);
751 
752     service->status.dwCurrentState = SERVICE_STOPPED;
753     SetServiceStatus(service->status_handle, &service->status);
754 }
755 #endif
756 
757 static void set_persistent_state_defaults(GAPersistentState *pstate)
758 {
759     g_assert(pstate);
760     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
761 }
762 
763 static void persistent_state_from_keyfile(GAPersistentState *pstate,
764                                           GKeyFile *keyfile)
765 {
766     g_assert(pstate);
767     g_assert(keyfile);
768     /* if any fields are missing, either because the file was tampered with
769      * by agents of chaos, or because the field wasn't present at the time the
770      * file was created, the best we can ever do is start over with the default
771      * values. so load them now, and ignore any errors in accessing key-value
772      * pairs
773      */
774     set_persistent_state_defaults(pstate);
775 
776     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
777         pstate->fd_counter =
778             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
779     }
780 }
781 
782 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
783                                         GKeyFile *keyfile)
784 {
785     g_assert(pstate);
786     g_assert(keyfile);
787 
788     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
789 }
790 
791 static gboolean write_persistent_state(const GAPersistentState *pstate,
792                                        const gchar *path)
793 {
794     GKeyFile *keyfile = g_key_file_new();
795     GError *gerr = NULL;
796     gboolean ret = true;
797     gchar *data = NULL;
798     gsize data_len;
799 
800     g_assert(pstate);
801 
802     persistent_state_to_keyfile(pstate, keyfile);
803     data = g_key_file_to_data(keyfile, &data_len, &gerr);
804     if (gerr) {
805         g_critical("failed to convert persistent state to string: %s",
806                    gerr->message);
807         ret = false;
808         goto out;
809     }
810 
811     g_file_set_contents(path, data, data_len, &gerr);
812     if (gerr) {
813         g_critical("failed to write persistent state to %s: %s",
814                     path, gerr->message);
815         ret = false;
816         goto out;
817     }
818 
819 out:
820     if (gerr) {
821         g_error_free(gerr);
822     }
823     if (keyfile) {
824         g_key_file_free(keyfile);
825     }
826     g_free(data);
827     return ret;
828 }
829 
830 static gboolean read_persistent_state(GAPersistentState *pstate,
831                                       const gchar *path, gboolean frozen)
832 {
833     GKeyFile *keyfile = NULL;
834     GError *gerr = NULL;
835     struct stat st;
836     gboolean ret = true;
837 
838     g_assert(pstate);
839 
840     if (stat(path, &st) == -1) {
841         /* it's okay if state file doesn't exist, but any other error
842          * indicates a permissions issue or some other misconfiguration
843          * that we likely won't be able to recover from.
844          */
845         if (errno != ENOENT) {
846             g_critical("unable to access state file at path %s: %s",
847                        path, strerror(errno));
848             ret = false;
849             goto out;
850         }
851 
852         /* file doesn't exist. initialize state to default values and
853          * attempt to save now. (we could wait till later when we have
854          * modified state we need to commit, but if there's a problem,
855          * such as a missing parent directory, we want to catch it now)
856          *
857          * there is a potential scenario where someone either managed to
858          * update the agent from a version that didn't use a key store
859          * while qemu-ga thought the filesystem was frozen, or
860          * deleted the key store prior to issuing a fsfreeze, prior
861          * to restarting the agent. in this case we go ahead and defer
862          * initial creation till we actually have modified state to
863          * write, otherwise fail to recover from freeze.
864          */
865         set_persistent_state_defaults(pstate);
866         if (!frozen) {
867             ret = write_persistent_state(pstate, path);
868             if (!ret) {
869                 g_critical("unable to create state file at path %s", path);
870                 ret = false;
871                 goto out;
872             }
873         }
874         ret = true;
875         goto out;
876     }
877 
878     keyfile = g_key_file_new();
879     g_key_file_load_from_file(keyfile, path, 0, &gerr);
880     if (gerr) {
881         g_critical("error loading persistent state from path: %s, %s",
882                    path, gerr->message);
883         ret = false;
884         goto out;
885     }
886 
887     persistent_state_from_keyfile(pstate, keyfile);
888 
889 out:
890     if (keyfile) {
891         g_key_file_free(keyfile);
892     }
893     if (gerr) {
894         g_error_free(gerr);
895     }
896 
897     return ret;
898 }
899 
900 int64_t ga_get_fd_handle(GAState *s, Error **errp)
901 {
902     int64_t handle;
903 
904     g_assert(s->pstate_filepath);
905     /* we blacklist commands and avoid operations that potentially require
906      * writing to disk when we're in a frozen state. this includes opening
907      * new files, so we should never get here in that situation
908      */
909     g_assert(!ga_is_frozen(s));
910 
911     handle = s->pstate.fd_counter++;
912 
913     /* This should never happen on a reasonable timeframe, as guest-file-open
914      * would have to be issued 2^63 times */
915     if (s->pstate.fd_counter == INT64_MAX) {
916         abort();
917     }
918 
919     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
920         error_setg(errp, "failed to commit persistent state to disk");
921         return -1;
922     }
923 
924     return handle;
925 }
926 
927 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
928 {
929     printf("%s\n", qmp_command_name(cmd));
930 }
931 
932 static GList *split_list(const gchar *str, const gchar *delim)
933 {
934     GList *list = NULL;
935     int i;
936     gchar **strv;
937 
938     strv = g_strsplit(str, delim, -1);
939     for (i = 0; strv[i]; i++) {
940         list = g_list_prepend(list, strv[i]);
941     }
942     g_free(strv);
943 
944     return list;
945 }
946 
947 typedef struct GAConfig {
948     char *channel_path;
949     char *method;
950     char *log_filepath;
951     char *pid_filepath;
952 #ifdef CONFIG_FSFREEZE
953     char *fsfreeze_hook;
954 #endif
955     char *state_dir;
956 #ifdef _WIN32
957     const char *service;
958 #endif
959     gchar *bliststr; /* blacklist may point to this string */
960     GList *blacklist;
961     int daemonize;
962     GLogLevelFlags log_level;
963     int dumpconf;
964 } GAConfig;
965 
966 static void config_load(GAConfig *config)
967 {
968     GError *gerr = NULL;
969     GKeyFile *keyfile;
970     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
971 
972     /* read system config */
973     keyfile = g_key_file_new();
974     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
975         goto end;
976     }
977     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
978         config->daemonize =
979             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
980     }
981     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
982         config->method =
983             g_key_file_get_string(keyfile, "general", "method", &gerr);
984     }
985     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
986         config->channel_path =
987             g_key_file_get_string(keyfile, "general", "path", &gerr);
988     }
989     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
990         config->log_filepath =
991             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
992     }
993     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
994         config->pid_filepath =
995             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
996     }
997 #ifdef CONFIG_FSFREEZE
998     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
999         config->fsfreeze_hook =
1000             g_key_file_get_string(keyfile,
1001                                   "general", "fsfreeze-hook", &gerr);
1002     }
1003 #endif
1004     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
1005         config->state_dir =
1006             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1007     }
1008     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1009         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1010         /* enable all log levels */
1011         config->log_level = G_LOG_LEVEL_MASK;
1012     }
1013     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
1014         config->bliststr =
1015             g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1016         config->blacklist = g_list_concat(config->blacklist,
1017                                           split_list(config->bliststr, ","));
1018     }
1019 
1020 end:
1021     g_key_file_free(keyfile);
1022     if (gerr &&
1023         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1024         g_critical("error loading configuration from path: %s, %s",
1025                    QGA_CONF_DEFAULT, gerr->message);
1026         exit(EXIT_FAILURE);
1027     }
1028     g_clear_error(&gerr);
1029 }
1030 
1031 static gchar *list_join(GList *list, const gchar separator)
1032 {
1033     GString *str = g_string_new("");
1034 
1035     while (list) {
1036         str = g_string_append(str, (gchar *)list->data);
1037         list = g_list_next(list);
1038         if (list) {
1039             str = g_string_append_c(str, separator);
1040         }
1041     }
1042 
1043     return g_string_free(str, FALSE);
1044 }
1045 
1046 static void config_dump(GAConfig *config)
1047 {
1048     GError *error = NULL;
1049     GKeyFile *keyfile;
1050     gchar *tmp;
1051 
1052     keyfile = g_key_file_new();
1053     g_assert(keyfile);
1054 
1055     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1056     g_key_file_set_string(keyfile, "general", "method", config->method);
1057     if (config->channel_path) {
1058         g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1059     }
1060     if (config->log_filepath) {
1061         g_key_file_set_string(keyfile, "general", "logfile",
1062                               config->log_filepath);
1063     }
1064     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1065 #ifdef CONFIG_FSFREEZE
1066     if (config->fsfreeze_hook) {
1067         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1068                               config->fsfreeze_hook);
1069     }
1070 #endif
1071     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1072     g_key_file_set_boolean(keyfile, "general", "verbose",
1073                            config->log_level == G_LOG_LEVEL_MASK);
1074     tmp = list_join(config->blacklist, ',');
1075     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1076     g_free(tmp);
1077 
1078     tmp = g_key_file_to_data(keyfile, NULL, &error);
1079     if (error) {
1080         g_critical("Failed to dump keyfile: %s", error->message);
1081         g_clear_error(&error);
1082     } else {
1083         printf("%s", tmp);
1084     }
1085 
1086     g_free(tmp);
1087     g_key_file_free(keyfile);
1088 }
1089 
1090 static void config_parse(GAConfig *config, int argc, char **argv)
1091 {
1092     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1093     int opt_ind = 0, ch;
1094     const struct option lopt[] = {
1095         { "help", 0, NULL, 'h' },
1096         { "version", 0, NULL, 'V' },
1097         { "dump-conf", 0, NULL, 'D' },
1098         { "logfile", 1, NULL, 'l' },
1099         { "pidfile", 1, NULL, 'f' },
1100 #ifdef CONFIG_FSFREEZE
1101         { "fsfreeze-hook", 2, NULL, 'F' },
1102 #endif
1103         { "verbose", 0, NULL, 'v' },
1104         { "method", 1, NULL, 'm' },
1105         { "path", 1, NULL, 'p' },
1106         { "daemonize", 0, NULL, 'd' },
1107         { "blacklist", 1, NULL, 'b' },
1108 #ifdef _WIN32
1109         { "service", 1, NULL, 's' },
1110 #endif
1111         { "statedir", 1, NULL, 't' },
1112         { NULL, 0, NULL, 0 }
1113     };
1114 
1115     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1116         switch (ch) {
1117         case 'm':
1118             g_free(config->method);
1119             config->method = g_strdup(optarg);
1120             break;
1121         case 'p':
1122             g_free(config->channel_path);
1123             config->channel_path = g_strdup(optarg);
1124             break;
1125         case 'l':
1126             g_free(config->log_filepath);
1127             config->log_filepath = g_strdup(optarg);
1128             break;
1129         case 'f':
1130             g_free(config->pid_filepath);
1131             config->pid_filepath = g_strdup(optarg);
1132             break;
1133 #ifdef CONFIG_FSFREEZE
1134         case 'F':
1135             g_free(config->fsfreeze_hook);
1136             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1137             break;
1138 #endif
1139         case 't':
1140             g_free(config->state_dir);
1141             config->state_dir = g_strdup(optarg);
1142             break;
1143         case 'v':
1144             /* enable all log levels */
1145             config->log_level = G_LOG_LEVEL_MASK;
1146             break;
1147         case 'V':
1148             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1149             exit(EXIT_SUCCESS);
1150         case 'd':
1151             config->daemonize = 1;
1152             break;
1153         case 'D':
1154             config->dumpconf = 1;
1155             break;
1156         case 'b': {
1157             if (is_help_option(optarg)) {
1158                 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1159                 exit(EXIT_SUCCESS);
1160             }
1161             config->blacklist = g_list_concat(config->blacklist,
1162                                              split_list(optarg, ","));
1163             break;
1164         }
1165 #ifdef _WIN32
1166         case 's':
1167             config->service = optarg;
1168             if (strcmp(config->service, "install") == 0) {
1169                 if (ga_install_vss_provider()) {
1170                     exit(EXIT_FAILURE);
1171                 }
1172                 if (ga_install_service(config->channel_path,
1173                                        config->log_filepath, config->state_dir)) {
1174                     exit(EXIT_FAILURE);
1175                 }
1176                 exit(EXIT_SUCCESS);
1177             } else if (strcmp(config->service, "uninstall") == 0) {
1178                 ga_uninstall_vss_provider();
1179                 exit(ga_uninstall_service());
1180             } else if (strcmp(config->service, "vss-install") == 0) {
1181                 if (ga_install_vss_provider()) {
1182                     exit(EXIT_FAILURE);
1183                 }
1184                 exit(EXIT_SUCCESS);
1185             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1186                 ga_uninstall_vss_provider();
1187                 exit(EXIT_SUCCESS);
1188             } else {
1189                 printf("Unknown service command.\n");
1190                 exit(EXIT_FAILURE);
1191             }
1192             break;
1193 #endif
1194         case 'h':
1195             usage(argv[0]);
1196             exit(EXIT_SUCCESS);
1197         case '?':
1198             g_print("Unknown option, try '%s --help' for more information.\n",
1199                     argv[0]);
1200             exit(EXIT_FAILURE);
1201         }
1202     }
1203 }
1204 
1205 static void config_free(GAConfig *config)
1206 {
1207     g_free(config->method);
1208     g_free(config->log_filepath);
1209     g_free(config->pid_filepath);
1210     g_free(config->state_dir);
1211     g_free(config->channel_path);
1212     g_free(config->bliststr);
1213 #ifdef CONFIG_FSFREEZE
1214     g_free(config->fsfreeze_hook);
1215 #endif
1216     g_list_free_full(config->blacklist, g_free);
1217     g_free(config);
1218 }
1219 
1220 static bool check_is_frozen(GAState *s)
1221 {
1222 #ifndef _WIN32
1223     /* check if a previous instance of qemu-ga exited with filesystems' state
1224      * marked as frozen. this could be a stale value (a non-qemu-ga process
1225      * or reboot may have since unfrozen them), but better to require an
1226      * uneeded unfreeze than to risk hanging on start-up
1227      */
1228     struct stat st;
1229     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1230         /* it's okay if the file doesn't exist, but if we can't access for
1231          * some other reason, such as permissions, there's a configuration
1232          * that needs to be addressed. so just bail now before we get into
1233          * more trouble later
1234          */
1235         if (errno != ENOENT) {
1236             g_critical("unable to access state file at path %s: %s",
1237                        s->state_filepath_isfrozen, strerror(errno));
1238             return EXIT_FAILURE;
1239         }
1240     } else {
1241         g_warning("previous instance appears to have exited with frozen"
1242                   " filesystems. deferring logging/pidfile creation and"
1243                   " disabling non-fsfreeze-safe commands until"
1244                   " guest-fsfreeze-thaw is issued, or filesystems are"
1245                   " manually unfrozen and the file %s is removed",
1246                   s->state_filepath_isfrozen);
1247         return true;
1248     }
1249 #endif
1250     return false;
1251 }
1252 
1253 static int run_agent(GAState *s, GAConfig *config, int socket_activation)
1254 {
1255     ga_state = s;
1256 
1257     g_log_set_default_handler(ga_log, s);
1258     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1259     ga_enable_logging(s);
1260 
1261 #ifdef _WIN32
1262     /* On win32 the state directory is application specific (be it the default
1263      * or a user override). We got past the command line parsing; let's create
1264      * the directory (with any intermediate directories). If we run into an
1265      * error later on, we won't try to clean up the directory, it is considered
1266      * persistent.
1267      */
1268     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1269         g_critical("unable to create (an ancestor of) the state directory"
1270                    " '%s': %s", config->state_dir, strerror(errno));
1271         return EXIT_FAILURE;
1272     }
1273 #endif
1274 
1275     if (ga_is_frozen(s)) {
1276         if (config->daemonize) {
1277             /* delay opening/locking of pidfile till filesystems are unfrozen */
1278             s->deferred_options.pid_filepath = config->pid_filepath;
1279             become_daemon(NULL);
1280         }
1281         if (config->log_filepath) {
1282             /* delay opening the log file till filesystems are unfrozen */
1283             s->deferred_options.log_filepath = config->log_filepath;
1284         }
1285         ga_disable_logging(s);
1286         qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1287     } else {
1288         if (config->daemonize) {
1289             become_daemon(config->pid_filepath);
1290         }
1291         if (config->log_filepath) {
1292             FILE *log_file = ga_open_logfile(config->log_filepath);
1293             if (!log_file) {
1294                 g_critical("unable to open specified log file: %s",
1295                            strerror(errno));
1296                 return EXIT_FAILURE;
1297             }
1298             s->log_file = log_file;
1299         }
1300     }
1301 
1302     /* load persistent state from disk */
1303     if (!read_persistent_state(&s->pstate,
1304                                s->pstate_filepath,
1305                                ga_is_frozen(s))) {
1306         g_critical("failed to load persistent state");
1307         return EXIT_FAILURE;
1308     }
1309 
1310     config->blacklist = ga_command_blacklist_init(config->blacklist);
1311     if (config->blacklist) {
1312         GList *l = config->blacklist;
1313         s->blacklist = config->blacklist;
1314         do {
1315             g_debug("disabling command: %s", (char *)l->data);
1316             qmp_disable_command(&ga_commands, l->data);
1317             l = g_list_next(l);
1318         } while (l);
1319     }
1320     s->command_state = ga_command_state_new();
1321     ga_command_state_init(s, s->command_state);
1322     ga_command_state_init_all(s->command_state);
1323     json_message_parser_init(&s->parser, process_event);
1324 
1325 #ifndef _WIN32
1326     if (!register_signal_handlers()) {
1327         g_critical("failed to register signal handlers");
1328         return EXIT_FAILURE;
1329     }
1330 #endif
1331 
1332     s->main_loop = g_main_loop_new(NULL, false);
1333 
1334     if (!channel_init(ga_state, config->method, config->channel_path,
1335                       socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1336         g_critical("failed to initialize guest agent channel");
1337         return EXIT_FAILURE;
1338     }
1339 #ifndef _WIN32
1340     g_main_loop_run(ga_state->main_loop);
1341 #else
1342     if (config->daemonize) {
1343         SERVICE_TABLE_ENTRY service_table[] = {
1344             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1345         StartServiceCtrlDispatcher(service_table);
1346     } else {
1347         g_main_loop_run(ga_state->main_loop);
1348     }
1349 #endif
1350 
1351     return EXIT_SUCCESS;
1352 }
1353 
1354 int main(int argc, char **argv)
1355 {
1356     int ret = EXIT_SUCCESS;
1357     GAState *s = g_new0(GAState, 1);
1358     GAConfig *config = g_new0(GAConfig, 1);
1359     int socket_activation;
1360 
1361     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1362 
1363     qga_qmp_init_marshal(&ga_commands);
1364 
1365     init_dfl_pathnames();
1366     config_load(config);
1367     config_parse(config, argc, argv);
1368 
1369     if (config->pid_filepath == NULL) {
1370         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1371     }
1372 
1373     if (config->state_dir == NULL) {
1374         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1375     }
1376 
1377     if (config->method == NULL) {
1378         config->method = g_strdup("virtio-serial");
1379     }
1380 
1381     socket_activation = check_socket_activation();
1382     if (socket_activation > 1) {
1383         g_critical("qemu-ga only supports listening on one socket");
1384         ret = EXIT_FAILURE;
1385         goto end;
1386     }
1387     if (socket_activation) {
1388         SocketAddress *addr;
1389 
1390         g_free(config->method);
1391         g_free(config->channel_path);
1392         config->method = NULL;
1393         config->channel_path = NULL;
1394 
1395         addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1396         if (addr) {
1397             if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1398                 config->method = g_strdup("unix-listen");
1399             } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1400                 config->method = g_strdup("vsock-listen");
1401             }
1402 
1403             qapi_free_SocketAddress(addr);
1404         }
1405 
1406         if (!config->method) {
1407             g_critical("unsupported listen fd type");
1408             ret = EXIT_FAILURE;
1409             goto end;
1410         }
1411     } else if (config->channel_path == NULL) {
1412         if (strcmp(config->method, "virtio-serial") == 0) {
1413             /* try the default path for the virtio-serial port */
1414             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1415         } else if (strcmp(config->method, "isa-serial") == 0) {
1416             /* try the default path for the serial port - COM1 */
1417             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1418         } else {
1419             g_critical("must specify a path for this channel");
1420             ret = EXIT_FAILURE;
1421             goto end;
1422         }
1423     }
1424 
1425     s->log_level = config->log_level;
1426     s->log_file = stderr;
1427 #ifdef CONFIG_FSFREEZE
1428     s->fsfreeze_hook = config->fsfreeze_hook;
1429 #endif
1430     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1431     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1432                                                  config->state_dir);
1433     s->frozen = check_is_frozen(s);
1434 
1435     if (config->dumpconf) {
1436         config_dump(config);
1437         goto end;
1438     }
1439 
1440     ret = run_agent(s, config, socket_activation);
1441 
1442 end:
1443     if (s->command_state) {
1444         ga_command_state_cleanup_all(s->command_state);
1445         ga_command_state_free(s->command_state);
1446         json_message_parser_destroy(&s->parser);
1447     }
1448     if (s->channel) {
1449         ga_channel_free(s->channel);
1450     }
1451     g_free(s->pstate_filepath);
1452     g_free(s->state_filepath_isfrozen);
1453 
1454     if (config->daemonize) {
1455         unlink(config->pid_filepath);
1456     }
1457 
1458     config_free(config);
1459     if (s->main_loop) {
1460         g_main_loop_unref(s->main_loop);
1461     }
1462     g_free(s);
1463 
1464     return ret;
1465 }
1466