qga/main.c

   1 /*
   2  * QEMU Guest Agent
   3  *
   4  * Copyright IBM Corp. 2011
   5  *
   6  * Authors:
   7  *  Adam Litke        <aglitke@linux.vnet.ibm.com>
   8  *  Michael Roth      <mdroth@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  */
  13 #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_KIND_UNIX) {
1392                 config->method = g_strdup("unix-listen");
1393             } else if (addr->type == SOCKET_ADDRESS_KIND_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 }