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 #ifdef _WIN32
  32 #include "qga/service-win32.h"
  33 #include "qga/vss-win32.h"
  34 #endif
  35 #ifdef __linux__
  36 #include <linux/fs.h>
  37 #ifdef FIFREEZE
  38 #define CONFIG_FSFREEZE
  39 #endif
  40 #endif
  41
  42 #ifndef _WIN32
  43 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
  44 #define QGA_STATE_RELATIVE_DIR  "run"
  45 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
  46 #else
  47 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
  48 #define QGA_STATE_RELATIVE_DIR  "qemu-ga"
  49 #define QGA_SERIAL_PATH_DEFAULT "COM1"
  50 #endif
  51 #ifdef CONFIG_FSFREEZE
  52 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
  53 #endif
  54 #define QGA_SENTINEL_BYTE 0xFF
  55 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
  56
  57 static struct {
  58     const char *state_dir;
  59     const char *pidfile;
  60 } dfl_pathnames;
  61
  62 typedef struct GAPersistentState {
  63 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
  64     int64_t fd_counter;
  65 } GAPersistentState;
  66
  67 struct GAState {
  68     JSONMessageParser parser;
  69     GMainLoop *main_loop;
  70     GAChannel *channel;
  71     bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
  72     GACommandState *command_state;
  73     GLogLevelFlags log_level;
  74     FILE *log_file;
  75     bool logging_enabled;
  76 #ifdef _WIN32
  77     GAService service;
  78 #endif
  79     bool delimit_response;
  80     bool frozen;
  81     GList *blacklist;
  82     char *state_filepath_isfrozen;
  83     struct {
  84         const char *log_filepath;
  85         const char *pid_filepath;
  86     } deferred_options;
  87 #ifdef CONFIG_FSFREEZE
  88     const char *fsfreeze_hook;
  89 #endif
  90     gchar *pstate_filepath;
  91     GAPersistentState pstate;
  92 };
  93
  94 struct GAState *ga_state;
  95
  96 /* commands that are safe to issue while filesystems are frozen */
  97 static const char *ga_freeze_whitelist[] = {
  98     "guest-ping",
  99     "guest-info",
 100     "guest-sync",
 101     "guest-sync-delimited",
 102     "guest-fsfreeze-status",
 103     "guest-fsfreeze-thaw",
 104     NULL
 105 };
 106
 107 #ifdef _WIN32
 108 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 109                                   LPVOID ctx);
 110 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
 111 #endif
 112
 113 static void
 114 init_dfl_pathnames(void)
 115 {
 116     g_assert(dfl_pathnames.state_dir == NULL);
 117     g_assert(dfl_pathnames.pidfile == NULL);
 118     dfl_pathnames.state_dir = qemu_get_local_state_pathname(
 119       QGA_STATE_RELATIVE_DIR);
 120     dfl_pathnames.pidfile   = qemu_get_local_state_pathname(
 121       QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
 122 }
 123
 124 static void quit_handler(int sig)
 125 {
 126     /* if we're frozen, don't exit unless we're absolutely forced to,
 127      * because it's basically impossible for graceful exit to complete
 128      * unless all log/pid files are on unfreezable filesystems. there's
 129      * also a very likely chance killing the agent before unfreezing
 130      * the filesystems is a mistake (or will be viewed as one later).
 131      */
 132     if (ga_is_frozen(ga_state)) {
 133         return;
 134     }
 135     g_debug("received signal num %d, quitting", sig);
 136
 137     if (g_main_loop_is_running(ga_state->main_loop)) {
 138         g_main_loop_quit(ga_state->main_loop);
 139     }
 140 }
 141
 142 #ifndef _WIN32
 143 static gboolean register_signal_handlers(void)
 144 {
 145     struct sigaction sigact;
 146     int ret;
 147
 148     memset(&sigact, 0, sizeof(struct sigaction));
 149     sigact.sa_handler = quit_handler;
 150
 151     ret = sigaction(SIGINT, &sigact, NULL);
 152     if (ret == -1) {
 153         g_error("error configuring signal handler: %s", strerror(errno));
 154     }
 155     ret = sigaction(SIGTERM, &sigact, NULL);
 156     if (ret == -1) {
 157         g_error("error configuring signal handler: %s", strerror(errno));
 158     }
 159
 160     sigact.sa_handler = SIG_IGN;
 161     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
 162         g_error("error configuring SIGPIPE signal handler: %s",
 163                 strerror(errno));
 164     }
 165
 166     return true;
 167 }
 168
 169 /* TODO: use this in place of all post-fork() fclose(std*) callers */
 170 void reopen_fd_to_null(int fd)
 171 {
 172     int nullfd;
 173
 174     nullfd = open("/dev/null", O_RDWR);
 175     if (nullfd < 0) {
 176         return;
 177     }
 178
 179     dup2(nullfd, fd);
 180
 181     if (nullfd != fd) {
 182         close(nullfd);
 183     }
 184 }
 185 #endif
 186
 187 static void usage(const char *cmd)
 188 {
 189     printf(
 190 "Usage: %s [-m <method> -p <path>] [<options>]\n"
 191 "QEMU Guest Agent %s\n"
 192 "\n"
 193 "  -m, --method      transport method: one of unix-listen, virtio-serial, or\n"
 194 "                    isa-serial (virtio-serial is the default)\n"
 195 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
 196 "                    %s,\n"
 197 "                    the default for isa-serial is:\n"
 198 "                    %s)\n"
 199 "  -l, --logfile     set logfile path, logs to stderr by default\n"
 200 "  -f, --pidfile     specify pidfile (default is %s)\n"
 201 #ifdef CONFIG_FSFREEZE
 202 "  -F, --fsfreeze-hook\n"
 203 "                    enable fsfreeze hook. Accepts an optional argument that\n"
 204 "                    specifies script to run on freeze/thaw. Script will be\n"
 205 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
 206 "                    (default is %s)\n"
 207 "                    If using -F with an argument, do not follow -F with a\n"
 208 "                    space.\n"
 209 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
 210 #endif
 211 "  -t, --statedir    specify dir to store state information (absolute paths\n"
 212 "                    only, default is %s)\n"
 213 "  -v, --verbose     log extra debugging information\n"
 214 "  -V, --version     print version information and exit\n"
 215 "  -d, --daemonize   become a daemon\n"
 216 #ifdef _WIN32
 217 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 218 #endif
 219 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
 220 "                    to list available RPCs)\n"
 221 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 222 "                    options / command-line parameters to stdout\n"
 223 "  -h, --help        display this help and exit\n"
 224 "\n"
 225 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
 226     , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
 227     dfl_pathnames.pidfile,
 228 #ifdef CONFIG_FSFREEZE
 229     QGA_FSFREEZE_HOOK_DEFAULT,
 230 #endif
 231     dfl_pathnames.state_dir);
 232 }
 233
 234 static const char *ga_log_level_str(GLogLevelFlags level)
 235 {
 236     switch (level & G_LOG_LEVEL_MASK) {
 237         case G_LOG_LEVEL_ERROR:
 238             return "error";
 239         case G_LOG_LEVEL_CRITICAL:
 240             return "critical";
 241         case G_LOG_LEVEL_WARNING:
 242             return "warning";
 243         case G_LOG_LEVEL_MESSAGE:
 244             return "message";
 245         case G_LOG_LEVEL_INFO:
 246             return "info";
 247         case G_LOG_LEVEL_DEBUG:
 248             return "debug";
 249         default:
 250             return "user";
 251     }
 252 }
 253
 254 bool ga_logging_enabled(GAState *s)
 255 {
 256     return s->logging_enabled;
 257 }
 258
 259 void ga_disable_logging(GAState *s)
 260 {
 261     s->logging_enabled = false;
 262 }
 263
 264 void ga_enable_logging(GAState *s)
 265 {
 266     s->logging_enabled = true;
 267 }
 268
 269 static void ga_log(const gchar *domain, GLogLevelFlags level,
 270                    const gchar *msg, gpointer opaque)
 271 {
 272     GAState *s = opaque;
 273     GTimeVal time;
 274     const char *level_str = ga_log_level_str(level);
 275
 276     if (!ga_logging_enabled(s)) {
 277         return;
 278     }
 279
 280     level &= G_LOG_LEVEL_MASK;
 281 #ifndef _WIN32
 282     if (g_strcmp0(domain, "syslog") == 0) {
 283         syslog(LOG_INFO, "%s: %s", level_str, msg);
 284     } else if (level & s->log_level) {
 285 #else
 286     if (level & s->log_level) {
 287 #endif
 288         g_get_current_time(&time);
 289         fprintf(s->log_file,
 290                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
 291         fflush(s->log_file);
 292     }
 293 }
 294
 295 void ga_set_response_delimited(GAState *s)
 296 {
 297     s->delimit_response = true;
 298 }
 299
 300 static FILE *ga_open_logfile(const char *logfile)
 301 {
 302     FILE *f;
 303
 304     f = fopen(logfile, "a");
 305     if (!f) {
 306         return NULL;
 307     }
 308
 309     qemu_set_cloexec(fileno(f));
 310     return f;
 311 }
 312
 313 #ifndef _WIN32
 314 static bool ga_open_pidfile(const char *pidfile)
 315 {
 316     int pidfd;
 317     char pidstr[32];
 318
 319     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
 320     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
 321         g_critical("Cannot lock pid file, %s", strerror(errno));
 322         if (pidfd != -1) {
 323             close(pidfd);
 324         }
 325         return false;
 326     }
 327
 328     if (ftruncate(pidfd, 0)) {
 329         g_critical("Failed to truncate pid file");
 330         goto fail;
 331     }
 332     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
 333     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
 334         g_critical("Failed to write pid file");
 335         goto fail;
 336     }
 337
 338     /* keep pidfile open & locked forever */
 339     return true;
 340
 341 fail:
 342     unlink(pidfile);
 343     close(pidfd);
 344     return false;
 345 }
 346 #else /* _WIN32 */
 347 static bool ga_open_pidfile(const char *pidfile)
 348 {
 349     return true;
 350 }
 351 #endif
 352
 353 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
 354 {
 355     return strcmp(str1, str2);
 356 }
 357
 358 /* disable commands that aren't safe for fsfreeze */
 359 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
 360 {
 361     bool whitelisted = false;
 362     int i = 0;
 363     const char *name = qmp_command_name(cmd);
 364
 365     while (ga_freeze_whitelist[i] != NULL) {
 366         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
 367             whitelisted = true;
 368         }
 369         i++;
 370     }
 371     if (!whitelisted) {
 372         g_debug("disabling command: %s", name);
 373         qmp_disable_command(name);
 374     }
 375 }
 376
 377 /* [re-]enable all commands, except those explicitly blacklisted by user */
 378 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
 379 {
 380     GList *blacklist = opaque;
 381     const char *name = qmp_command_name(cmd);
 382
 383     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
 384         !qmp_command_is_enabled(cmd)) {
 385         g_debug("enabling command: %s", name);
 386         qmp_enable_command(name);
 387     }
 388 }
 389
 390 static bool ga_create_file(const char *path)
 391 {
 392     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
 393     if (fd == -1) {
 394         g_warning("unable to open/create file %s: %s", path, strerror(errno));
 395         return false;
 396     }
 397     close(fd);
 398     return true;
 399 }
 400
 401 static bool ga_delete_file(const char *path)
 402 {
 403     int ret = unlink(path);
 404     if (ret == -1) {
 405         g_warning("unable to delete file: %s: %s", path, strerror(errno));
 406         return false;
 407     }
 408
 409     return true;
 410 }
 411
 412 bool ga_is_frozen(GAState *s)
 413 {
 414     return s->frozen;
 415 }
 416
 417 void ga_set_frozen(GAState *s)
 418 {
 419     if (ga_is_frozen(s)) {
 420         return;
 421     }
 422     /* disable all non-whitelisted (for frozen state) commands */
 423     qmp_for_each_command(ga_disable_non_whitelisted, NULL);
 424     g_warning("disabling logging due to filesystem freeze");
 425     ga_disable_logging(s);
 426     s->frozen = true;
 427     if (!ga_create_file(s->state_filepath_isfrozen)) {
 428         g_warning("unable to create %s, fsfreeze may not function properly",
 429                   s->state_filepath_isfrozen);
 430     }
 431 }
 432
 433 void ga_unset_frozen(GAState *s)
 434 {
 435     if (!ga_is_frozen(s)) {
 436         return;
 437     }
 438
 439     /* if we delayed creation/opening of pid/log files due to being
 440      * in a frozen state at start up, do it now
 441      */
 442     if (s->deferred_options.log_filepath) {
 443         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
 444         if (!s->log_file) {
 445             s->log_file = stderr;
 446         }
 447         s->deferred_options.log_filepath = NULL;
 448     }
 449     ga_enable_logging(s);
 450     g_warning("logging re-enabled due to filesystem unfreeze");
 451     if (s->deferred_options.pid_filepath) {
 452         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
 453             g_warning("failed to create/open pid file");
 454         }
 455         s->deferred_options.pid_filepath = NULL;
 456     }
 457
 458     /* enable all disabled, non-blacklisted commands */
 459     qmp_for_each_command(ga_enable_non_blacklisted, s->blacklist);
 460     s->frozen = false;
 461     if (!ga_delete_file(s->state_filepath_isfrozen)) {
 462         g_warning("unable to delete %s, fsfreeze may not function properly",
 463                   s->state_filepath_isfrozen);
 464     }
 465 }
 466
 467 #ifdef CONFIG_FSFREEZE
 468 const char *ga_fsfreeze_hook(GAState *s)
 469 {
 470     return s->fsfreeze_hook;
 471 }
 472 #endif
 473
 474 static void become_daemon(const char *pidfile)
 475 {
 476 #ifndef _WIN32
 477     pid_t pid, sid;
 478
 479     pid = fork();
 480     if (pid < 0) {
 481         exit(EXIT_FAILURE);
 482     }
 483     if (pid > 0) {
 484         exit(EXIT_SUCCESS);
 485     }
 486
 487     if (pidfile) {
 488         if (!ga_open_pidfile(pidfile)) {
 489             g_critical("failed to create pidfile");
 490             exit(EXIT_FAILURE);
 491         }
 492     }
 493
 494     umask(S_IRWXG | S_IRWXO);
 495     sid = setsid();
 496     if (sid < 0) {
 497         goto fail;
 498     }
 499     if ((chdir("/")) < 0) {
 500         goto fail;
 501     }
 502
 503     reopen_fd_to_null(STDIN_FILENO);
 504     reopen_fd_to_null(STDOUT_FILENO);
 505     reopen_fd_to_null(STDERR_FILENO);
 506     return;
 507
 508 fail:
 509     if (pidfile) {
 510         unlink(pidfile);
 511     }
 512     g_critical("failed to daemonize");
 513     exit(EXIT_FAILURE);
 514 #endif
 515 }
 516
 517 static int send_response(GAState *s, QObject *payload)
 518 {
 519     const char *buf;
 520     QString *payload_qstr, *response_qstr;
 521     GIOStatus status;
 522
 523     g_assert(payload && s->channel);
 524
 525     payload_qstr = qobject_to_json(payload);
 526     if (!payload_qstr) {
 527         return -EINVAL;
 528     }
 529
 530     if (s->delimit_response) {
 531         s->delimit_response = false;
 532         response_qstr = qstring_new();
 533         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
 534         qstring_append(response_qstr, qstring_get_str(payload_qstr));
 535         QDECREF(payload_qstr);
 536     } else {
 537         response_qstr = payload_qstr;
 538     }
 539
 540     qstring_append_chr(response_qstr, '\n');
 541     buf = qstring_get_str(response_qstr);
 542     status = ga_channel_write_all(s->channel, buf, strlen(buf));
 543     QDECREF(response_qstr);
 544     if (status != G_IO_STATUS_NORMAL) {
 545         return -EIO;
 546     }
 547
 548     return 0;
 549 }
 550
 551 static void process_command(GAState *s, QDict *req)
 552 {
 553     QObject *rsp = NULL;
 554     int ret;
 555
 556     g_assert(req);
 557     g_debug("processing command");
 558     rsp = qmp_dispatch(QOBJECT(req));
 559     if (rsp) {
 560         ret = send_response(s, rsp);
 561         if (ret) {
 562             g_warning("error sending response: %s", strerror(ret));
 563         }
 564         qobject_decref(rsp);
 565     }
 566 }
 567
 568 /* handle requests/control events coming in over the channel */
 569 static void process_event(JSONMessageParser *parser, GQueue *tokens)
 570 {
 571     GAState *s = container_of(parser, GAState, parser);
 572     QDict *qdict;
 573     Error *err = NULL;
 574     int ret;
 575
 576     g_assert(s && parser);
 577
 578     g_debug("process_event: called");
 579     qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
 580     if (err || !qdict) {
 581         QDECREF(qdict);
 582         qdict = qdict_new();
 583         if (!err) {
 584             g_warning("failed to parse event: unknown error");
 585             error_setg(&err, QERR_JSON_PARSING);
 586         } else {
 587             g_warning("failed to parse event: %s", error_get_pretty(err));
 588         }
 589         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 590         error_free(err);
 591     }
 592
 593     /* handle host->guest commands */
 594     if (qdict_haskey(qdict, "execute")) {
 595         process_command(s, qdict);
 596     } else {
 597         if (!qdict_haskey(qdict, "error")) {
 598             QDECREF(qdict);
 599             qdict = qdict_new();
 600             g_warning("unrecognized payload format");
 601             error_setg(&err, QERR_UNSUPPORTED);
 602             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 603             error_free(err);
 604         }
 605         ret = send_response(s, QOBJECT(qdict));
 606         if (ret < 0) {
 607             g_warning("error sending error response: %s", strerror(-ret));
 608         }
 609     }
 610
 611     QDECREF(qdict);
 612 }
 613
 614 /* false return signals GAChannel to close the current client connection */
 615 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
 616 {
 617     GAState *s = data;
 618     gchar buf[QGA_READ_COUNT_DEFAULT+1];
 619     gsize count;
 620     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
 621     switch (status) {
 622     case G_IO_STATUS_ERROR:
 623         g_warning("error reading channel");
 624         return false;
 625     case G_IO_STATUS_NORMAL:
 626         buf[count] = 0;
 627         g_debug("read data, count: %d, data: %s", (int)count, buf);
 628         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
 629         break;
 630     case G_IO_STATUS_EOF:
 631         g_debug("received EOF");
 632         if (!s->virtio) {
 633             return false;
 634         }
 635         /* fall through */
 636     case G_IO_STATUS_AGAIN:
 637         /* virtio causes us to spin here when no process is attached to
 638          * host-side chardev. sleep a bit to mitigate this
 639          */
 640         if (s->virtio) {
 641             usleep(100*1000);
 642         }
 643         return true;
 644     default:
 645         g_warning("unknown channel read status, closing");
 646         return false;
 647     }
 648     return true;
 649 }
 650
 651 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
 652 {
 653     GAChannelMethod channel_method;
 654
 655     if (strcmp(method, "virtio-serial") == 0) {
 656         s->virtio = true; /* virtio requires special handling in some cases */
 657         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
 658     } else if (strcmp(method, "isa-serial") == 0) {
 659         channel_method = GA_CHANNEL_ISA_SERIAL;
 660     } else if (strcmp(method, "unix-listen") == 0) {
 661         channel_method = GA_CHANNEL_UNIX_LISTEN;
 662     } else {
 663         g_critical("unsupported channel method/type: %s", method);
 664         return false;
 665     }
 666
 667     s->channel = ga_channel_new(channel_method, path, channel_event_cb, s);
 668     if (!s->channel) {
 669         g_critical("failed to create guest agent channel");
 670         return false;
 671     }
 672
 673     return true;
 674 }
 675
 676 #ifdef _WIN32
 677 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 678                                   LPVOID ctx)
 679 {
 680     DWORD ret = NO_ERROR;
 681     GAService *service = &ga_state->service;
 682
 683     switch (ctrl)
 684     {
 685         case SERVICE_CONTROL_STOP:
 686         case SERVICE_CONTROL_SHUTDOWN:
 687             quit_handler(SIGTERM);
 688             service->status.dwCurrentState = SERVICE_STOP_PENDING;
 689             SetServiceStatus(service->status_handle, &service->status);
 690             break;
 691
 692         default:
 693             ret = ERROR_CALL_NOT_IMPLEMENTED;
 694     }
 695     return ret;
 696 }
 697
 698 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
 699 {
 700     GAService *service = &ga_state->service;
 701
 702     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
 703         service_ctrl_handler, NULL);
 704
 705     if (service->status_handle == 0) {
 706         g_critical("Failed to register extended requests function!\n");
 707         return;
 708     }
 709
 710     service->status.dwServiceType = SERVICE_WIN32;
 711     service->status.dwCurrentState = SERVICE_RUNNING;
 712     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 713     service->status.dwWin32ExitCode = NO_ERROR;
 714     service->status.dwServiceSpecificExitCode = NO_ERROR;
 715     service->status.dwCheckPoint = 0;
 716     service->status.dwWaitHint = 0;
 717     SetServiceStatus(service->status_handle, &service->status);
 718
 719     g_main_loop_run(ga_state->main_loop);
 720
 721     service->status.dwCurrentState = SERVICE_STOPPED;
 722     SetServiceStatus(service->status_handle, &service->status);
 723 }
 724 #endif
 725
 726 static void set_persistent_state_defaults(GAPersistentState *pstate)
 727 {
 728     g_assert(pstate);
 729     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
 730 }
 731
 732 static void persistent_state_from_keyfile(GAPersistentState *pstate,
 733                                           GKeyFile *keyfile)
 734 {
 735     g_assert(pstate);
 736     g_assert(keyfile);
 737     /* if any fields are missing, either because the file was tampered with
 738      * by agents of chaos, or because the field wasn't present at the time the
 739      * file was created, the best we can ever do is start over with the default
 740      * values. so load them now, and ignore any errors in accessing key-value
 741      * pairs
 742      */
 743     set_persistent_state_defaults(pstate);
 744
 745     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
 746         pstate->fd_counter =
 747             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
 748     }
 749 }
 750
 751 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
 752                                         GKeyFile *keyfile)
 753 {
 754     g_assert(pstate);
 755     g_assert(keyfile);
 756
 757     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
 758 }
 759
 760 static gboolean write_persistent_state(const GAPersistentState *pstate,
 761                                        const gchar *path)
 762 {
 763     GKeyFile *keyfile = g_key_file_new();
 764     GError *gerr = NULL;
 765     gboolean ret = true;
 766     gchar *data = NULL;
 767     gsize data_len;
 768
 769     g_assert(pstate);
 770
 771     persistent_state_to_keyfile(pstate, keyfile);
 772     data = g_key_file_to_data(keyfile, &data_len, &gerr);
 773     if (gerr) {
 774         g_critical("failed to convert persistent state to string: %s",
 775                    gerr->message);
 776         ret = false;
 777         goto out;
 778     }
 779
 780     g_file_set_contents(path, data, data_len, &gerr);
 781     if (gerr) {
 782         g_critical("failed to write persistent state to %s: %s",
 783                     path, gerr->message);
 784         ret = false;
 785         goto out;
 786     }
 787
 788 out:
 789     if (gerr) {
 790         g_error_free(gerr);
 791     }
 792     if (keyfile) {
 793         g_key_file_free(keyfile);
 794     }
 795     g_free(data);
 796     return ret;
 797 }
 798
 799 static gboolean read_persistent_state(GAPersistentState *pstate,
 800                                       const gchar *path, gboolean frozen)
 801 {
 802     GKeyFile *keyfile = NULL;
 803     GError *gerr = NULL;
 804     struct stat st;
 805     gboolean ret = true;
 806
 807     g_assert(pstate);
 808
 809     if (stat(path, &st) == -1) {
 810         /* it's okay if state file doesn't exist, but any other error
 811          * indicates a permissions issue or some other misconfiguration
 812          * that we likely won't be able to recover from.
 813          */
 814         if (errno != ENOENT) {
 815             g_critical("unable to access state file at path %s: %s",
 816                        path, strerror(errno));
 817             ret = false;
 818             goto out;
 819         }
 820
 821         /* file doesn't exist. initialize state to default values and
 822          * attempt to save now. (we could wait till later when we have
 823          * modified state we need to commit, but if there's a problem,
 824          * such as a missing parent directory, we want to catch it now)
 825          *
 826          * there is a potential scenario where someone either managed to
 827          * update the agent from a version that didn't use a key store
 828          * while qemu-ga thought the filesystem was frozen, or
 829          * deleted the key store prior to issuing a fsfreeze, prior
 830          * to restarting the agent. in this case we go ahead and defer
 831          * initial creation till we actually have modified state to
 832          * write, otherwise fail to recover from freeze.
 833          */
 834         set_persistent_state_defaults(pstate);
 835         if (!frozen) {
 836             ret = write_persistent_state(pstate, path);
 837             if (!ret) {
 838                 g_critical("unable to create state file at path %s", path);
 839                 ret = false;
 840                 goto out;
 841             }
 842         }
 843         ret = true;
 844         goto out;
 845     }
 846
 847     keyfile = g_key_file_new();
 848     g_key_file_load_from_file(keyfile, path, 0, &gerr);
 849     if (gerr) {
 850         g_critical("error loading persistent state from path: %s, %s",
 851                    path, gerr->message);
 852         ret = false;
 853         goto out;
 854     }
 855
 856     persistent_state_from_keyfile(pstate, keyfile);
 857
 858 out:
 859     if (keyfile) {
 860         g_key_file_free(keyfile);
 861     }
 862     if (gerr) {
 863         g_error_free(gerr);
 864     }
 865
 866     return ret;
 867 }
 868
 869 int64_t ga_get_fd_handle(GAState *s, Error **errp)
 870 {
 871     int64_t handle;
 872
 873     g_assert(s->pstate_filepath);
 874     /* we blacklist commands and avoid operations that potentially require
 875      * writing to disk when we're in a frozen state. this includes opening
 876      * new files, so we should never get here in that situation
 877      */
 878     g_assert(!ga_is_frozen(s));
 879
 880     handle = s->pstate.fd_counter++;
 881
 882     /* This should never happen on a reasonable timeframe, as guest-file-open
 883      * would have to be issued 2^63 times */
 884     if (s->pstate.fd_counter == INT64_MAX) {
 885         abort();
 886     }
 887
 888     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
 889         error_setg(errp, "failed to commit persistent state to disk");
 890         return -1;
 891     }
 892
 893     return handle;
 894 }
 895
 896 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
 897 {
 898     printf("%s\n", qmp_command_name(cmd));
 899 }
 900
 901 static GList *split_list(const gchar *str, const gchar *delim)
 902 {
 903     GList *list = NULL;
 904     int i;
 905     gchar **strv;
 906
 907     strv = g_strsplit(str, delim, -1);
 908     for (i = 0; strv[i]; i++) {
 909         list = g_list_prepend(list, strv[i]);
 910     }
 911     g_free(strv);
 912
 913     return list;
 914 }
 915
 916 typedef struct GAConfig {
 917     char *channel_path;
 918     char *method;
 919     char *log_filepath;
 920     char *pid_filepath;
 921 #ifdef CONFIG_FSFREEZE
 922     char *fsfreeze_hook;
 923 #endif
 924     char *state_dir;
 925 #ifdef _WIN32
 926     const char *service;
 927 #endif
 928     gchar *bliststr; /* blacklist may point to this string */
 929     GList *blacklist;
 930     int daemonize;
 931     GLogLevelFlags log_level;
 932     int dumpconf;
 933 } GAConfig;
 934
 935 static void config_load(GAConfig *config)
 936 {
 937     GError *gerr = NULL;
 938     GKeyFile *keyfile;
 939     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
 940
 941     /* read system config */
 942     keyfile = g_key_file_new();
 943     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
 944         goto end;
 945     }
 946     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
 947         config->daemonize =
 948             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
 949     }
 950     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
 951         config->method =
 952             g_key_file_get_string(keyfile, "general", "method", &gerr);
 953     }
 954     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
 955         config->channel_path =
 956             g_key_file_get_string(keyfile, "general", "path", &gerr);
 957     }
 958     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
 959         config->log_filepath =
 960             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
 961     }
 962     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
 963         config->pid_filepath =
 964             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
 965     }
 966 #ifdef CONFIG_FSFREEZE
 967     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
 968         config->fsfreeze_hook =
 969             g_key_file_get_string(keyfile,
 970                                   "general", "fsfreeze-hook", &gerr);
 971     }
 972 #endif
 973     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
 974         config->state_dir =
 975             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
 976     }
 977     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
 978         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
 979         /* enable all log levels */
 980         config->log_level = G_LOG_LEVEL_MASK;
 981     }
 982     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
 983         config->bliststr =
 984             g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
 985         config->blacklist = g_list_concat(config->blacklist,
 986                                           split_list(config->bliststr, ","));
 987     }
 988
 989 end:
 990     g_key_file_free(keyfile);
 991     if (gerr &&
 992         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
 993         g_critical("error loading configuration from path: %s, %s",
 994                    QGA_CONF_DEFAULT, gerr->message);
 995         exit(EXIT_FAILURE);
 996     }
 997     g_clear_error(&gerr);
 998 }
 999
1000 static gchar *list_join(GList *list, const gchar separator)
1001 {
1002     GString *str = g_string_new("");
1003
1004     while (list) {
1005         str = g_string_append(str, (gchar *)list->data);
1006         list = g_list_next(list);
1007         if (list) {
1008             str = g_string_append_c(str, separator);
1009         }
1010     }
1011
1012     return g_string_free(str, FALSE);
1013 }
1014
1015 static void config_dump(GAConfig *config)
1016 {
1017     GError *error = NULL;
1018     GKeyFile *keyfile;
1019     gchar *tmp;
1020
1021     keyfile = g_key_file_new();
1022     g_assert(keyfile);
1023
1024     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1025     g_key_file_set_string(keyfile, "general", "method", config->method);
1026     g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1027     if (config->log_filepath) {
1028         g_key_file_set_string(keyfile, "general", "logfile",
1029                               config->log_filepath);
1030     }
1031     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1032 #ifdef CONFIG_FSFREEZE
1033     if (config->fsfreeze_hook) {
1034         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1035                               config->fsfreeze_hook);
1036     }
1037 #endif
1038     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1039     g_key_file_set_boolean(keyfile, "general", "verbose",
1040                            config->log_level == G_LOG_LEVEL_MASK);
1041     tmp = list_join(config->blacklist, ',');
1042     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1043     g_free(tmp);
1044
1045     tmp = g_key_file_to_data(keyfile, NULL, &error);
1046     printf("%s", tmp);
1047
1048     g_free(tmp);
1049     g_key_file_free(keyfile);
1050 }
1051
1052 static void config_parse(GAConfig *config, int argc, char **argv)
1053 {
1054     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1055     int opt_ind = 0, ch;
1056     const struct option lopt[] = {
1057         { "help", 0, NULL, 'h' },
1058         { "version", 0, NULL, 'V' },
1059         { "dump-conf", 0, NULL, 'D' },
1060         { "logfile", 1, NULL, 'l' },
1061         { "pidfile", 1, NULL, 'f' },
1062 #ifdef CONFIG_FSFREEZE
1063         { "fsfreeze-hook", 2, NULL, 'F' },
1064 #endif
1065         { "verbose", 0, NULL, 'v' },
1066         { "method", 1, NULL, 'm' },
1067         { "path", 1, NULL, 'p' },
1068         { "daemonize", 0, NULL, 'd' },
1069         { "blacklist", 1, NULL, 'b' },
1070 #ifdef _WIN32
1071         { "service", 1, NULL, 's' },
1072 #endif
1073         { "statedir", 1, NULL, 't' },
1074         { NULL, 0, NULL, 0 }
1075     };
1076
1077     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1078         switch (ch) {
1079         case 'm':
1080             g_free(config->method);
1081             config->method = g_strdup(optarg);
1082             break;
1083         case 'p':
1084             g_free(config->channel_path);
1085             config->channel_path = g_strdup(optarg);
1086             break;
1087         case 'l':
1088             g_free(config->log_filepath);
1089             config->log_filepath = g_strdup(optarg);
1090             break;
1091         case 'f':
1092             g_free(config->pid_filepath);
1093             config->pid_filepath = g_strdup(optarg);
1094             break;
1095 #ifdef CONFIG_FSFREEZE
1096         case 'F':
1097             g_free(config->fsfreeze_hook);
1098             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1099             break;
1100 #endif
1101         case 't':
1102             g_free(config->state_dir);
1103             config->state_dir = g_strdup(optarg);
1104             break;
1105         case 'v':
1106             /* enable all log levels */
1107             config->log_level = G_LOG_LEVEL_MASK;
1108             break;
1109         case 'V':
1110             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1111             exit(EXIT_SUCCESS);
1112         case 'd':
1113             config->daemonize = 1;
1114             break;
1115         case 'D':
1116             config->dumpconf = 1;
1117             break;
1118         case 'b': {
1119             if (is_help_option(optarg)) {
1120                 qmp_for_each_command(ga_print_cmd, NULL);
1121                 exit(EXIT_SUCCESS);
1122             }
1123             config->blacklist = g_list_concat(config->blacklist,
1124                                              split_list(optarg, ","));
1125             break;
1126         }
1127 #ifdef _WIN32
1128         case 's':
1129             config->service = optarg;
1130             if (strcmp(config->service, "install") == 0) {
1131                 if (ga_install_vss_provider()) {
1132                     exit(EXIT_FAILURE);
1133                 }
1134                 if (ga_install_service(config->channel_path,
1135                                        config->log_filepath, config->state_dir)) {
1136                     exit(EXIT_FAILURE);
1137                 }
1138                 exit(EXIT_SUCCESS);
1139             } else if (strcmp(config->service, "uninstall") == 0) {
1140                 ga_uninstall_vss_provider();
1141                 exit(ga_uninstall_service());
1142             } else if (strcmp(config->service, "vss-install") == 0) {
1143                 if (ga_install_vss_provider()) {
1144                     exit(EXIT_FAILURE);
1145                 }
1146                 exit(EXIT_SUCCESS);
1147             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1148                 ga_uninstall_vss_provider();
1149                 exit(EXIT_SUCCESS);
1150             } else {
1151                 printf("Unknown service command.\n");
1152                 exit(EXIT_FAILURE);
1153             }
1154             break;
1155 #endif
1156         case 'h':
1157             usage(argv[0]);
1158             exit(EXIT_SUCCESS);
1159         case '?':
1160             g_print("Unknown option, try '%s --help' for more information.\n",
1161                     argv[0]);
1162             exit(EXIT_FAILURE);
1163         }
1164     }
1165 }
1166
1167 static void config_free(GAConfig *config)
1168 {
1169     g_free(config->method);
1170     g_free(config->log_filepath);
1171     g_free(config->pid_filepath);
1172     g_free(config->state_dir);
1173     g_free(config->channel_path);
1174     g_free(config->bliststr);
1175 #ifdef CONFIG_FSFREEZE
1176     g_free(config->fsfreeze_hook);
1177 #endif
1178     g_list_free_full(config->blacklist, g_free);
1179     g_free(config);
1180 }
1181
1182 static bool check_is_frozen(GAState *s)
1183 {
1184 #ifndef _WIN32
1185     /* check if a previous instance of qemu-ga exited with filesystems' state
1186      * marked as frozen. this could be a stale value (a non-qemu-ga process
1187      * or reboot may have since unfrozen them), but better to require an
1188      * uneeded unfreeze than to risk hanging on start-up
1189      */
1190     struct stat st;
1191     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1192         /* it's okay if the file doesn't exist, but if we can't access for
1193          * some other reason, such as permissions, there's a configuration
1194          * that needs to be addressed. so just bail now before we get into
1195          * more trouble later
1196          */
1197         if (errno != ENOENT) {
1198             g_critical("unable to access state file at path %s: %s",
1199                        s->state_filepath_isfrozen, strerror(errno));
1200             return EXIT_FAILURE;
1201         }
1202     } else {
1203         g_warning("previous instance appears to have exited with frozen"
1204                   " filesystems. deferring logging/pidfile creation and"
1205                   " disabling non-fsfreeze-safe commands until"
1206                   " guest-fsfreeze-thaw is issued, or filesystems are"
1207                   " manually unfrozen and the file %s is removed",
1208                   s->state_filepath_isfrozen);
1209         return true;
1210     }
1211 #endif
1212     return false;
1213 }
1214
1215 static int run_agent(GAState *s, GAConfig *config)
1216 {
1217     ga_state = s;
1218
1219     g_log_set_default_handler(ga_log, s);
1220     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1221     ga_enable_logging(s);
1222
1223 #ifdef _WIN32
1224     /* On win32 the state directory is application specific (be it the default
1225      * or a user override). We got past the command line parsing; let's create
1226      * the directory (with any intermediate directories). If we run into an
1227      * error later on, we won't try to clean up the directory, it is considered
1228      * persistent.
1229      */
1230     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1231         g_critical("unable to create (an ancestor of) the state directory"
1232                    " '%s': %s", config->state_dir, strerror(errno));
1233         return EXIT_FAILURE;
1234     }
1235 #endif
1236
1237     if (ga_is_frozen(s)) {
1238         if (config->daemonize) {
1239             /* delay opening/locking of pidfile till filesystems are unfrozen */
1240             s->deferred_options.pid_filepath = config->pid_filepath;
1241             become_daemon(NULL);
1242         }
1243         if (config->log_filepath) {
1244             /* delay opening the log file till filesystems are unfrozen */
1245             s->deferred_options.log_filepath = config->log_filepath;
1246         }
1247         ga_disable_logging(s);
1248         qmp_for_each_command(ga_disable_non_whitelisted, NULL);
1249     } else {
1250         if (config->daemonize) {
1251             become_daemon(config->pid_filepath);
1252         }
1253         if (config->log_filepath) {
1254             FILE *log_file = ga_open_logfile(config->log_filepath);
1255             if (!log_file) {
1256                 g_critical("unable to open specified log file: %s",
1257                            strerror(errno));
1258                 return EXIT_FAILURE;
1259             }
1260             s->log_file = log_file;
1261         }
1262     }
1263
1264     /* load persistent state from disk */
1265     if (!read_persistent_state(&s->pstate,
1266                                s->pstate_filepath,
1267                                ga_is_frozen(s))) {
1268         g_critical("failed to load persistent state");
1269         return EXIT_FAILURE;
1270     }
1271
1272     config->blacklist = ga_command_blacklist_init(config->blacklist);
1273     if (config->blacklist) {
1274         GList *l = config->blacklist;
1275         s->blacklist = config->blacklist;
1276         do {
1277             g_debug("disabling command: %s", (char *)l->data);
1278             qmp_disable_command(l->data);
1279             l = g_list_next(l);
1280         } while (l);
1281     }
1282     s->command_state = ga_command_state_new();
1283     ga_command_state_init(s, s->command_state);
1284     ga_command_state_init_all(s->command_state);
1285     json_message_parser_init(&s->parser, process_event);
1286     ga_state = s;
1287 #ifndef _WIN32
1288     if (!register_signal_handlers()) {
1289         g_critical("failed to register signal handlers");
1290         return EXIT_FAILURE;
1291     }
1292 #endif
1293
1294     s->main_loop = g_main_loop_new(NULL, false);
1295     if (!channel_init(ga_state, config->method, config->channel_path)) {
1296         g_critical("failed to initialize guest agent channel");
1297         return EXIT_FAILURE;
1298     }
1299 #ifndef _WIN32
1300     g_main_loop_run(ga_state->main_loop);
1301 #else
1302     if (config->daemonize) {
1303         SERVICE_TABLE_ENTRY service_table[] = {
1304             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1305         StartServiceCtrlDispatcher(service_table);
1306     } else {
1307         g_main_loop_run(ga_state->main_loop);
1308     }
1309 #endif
1310
1311     return EXIT_SUCCESS;
1312 }
1313
1314 int main(int argc, char **argv)
1315 {
1316     int ret = EXIT_SUCCESS;
1317     GAState *s = g_new0(GAState, 1);
1318     GAConfig *config = g_new0(GAConfig, 1);
1319
1320     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1321
1322     module_call_init(MODULE_INIT_QAPI);
1323
1324     init_dfl_pathnames();
1325     config_load(config);
1326     config_parse(config, argc, argv);
1327
1328     if (config->pid_filepath == NULL) {
1329         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1330     }
1331
1332     if (config->state_dir == NULL) {
1333         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1334     }
1335
1336     if (config->method == NULL) {
1337         config->method = g_strdup("virtio-serial");
1338     }
1339
1340     if (config->channel_path == NULL) {
1341         if (strcmp(config->method, "virtio-serial") == 0) {
1342             /* try the default path for the virtio-serial port */
1343             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1344         } else if (strcmp(config->method, "isa-serial") == 0) {
1345             /* try the default path for the serial port - COM1 */
1346             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1347         } else {
1348             g_critical("must specify a path for this channel");
1349             ret = EXIT_FAILURE;
1350             goto end;
1351         }
1352     }
1353
1354     s->log_level = config->log_level;
1355     s->log_file = stderr;
1356 #ifdef CONFIG_FSFREEZE
1357     s->fsfreeze_hook = config->fsfreeze_hook;
1358 #endif
1359     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1360     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1361                                                  config->state_dir);
1362     s->frozen = check_is_frozen(s);
1363
1364     if (config->dumpconf) {
1365         config_dump(config);
1366         goto end;
1367     }
1368
1369     ret = run_agent(s, config);
1370
1371 end:
1372     if (s->command_state) {
1373         ga_command_state_cleanup_all(s->command_state);
1374         ga_command_state_free(s->command_state);
1375         json_message_parser_destroy(&s->parser);
1376     }
1377     if (s->channel) {
1378         ga_channel_free(s->channel);
1379     }
1380     g_free(s->pstate_filepath);
1381     g_free(s->state_filepath_isfrozen);
1382
1383     if (config->daemonize) {
1384         unlink(config->pid_filepath);
1385     }
1386
1387     config_free(config);
1388     if (s->main_loop) {
1389         g_main_loop_unref(s->main_loop);
1390     }
1391     g_free(s);
1392
1393     return ret;
1394 }