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 <glib.h>
  15 #include <getopt.h>
  16 #include <glib/gstdio.h>
  17 #ifndef _WIN32
  18 #include <syslog.h>
  19 #include <sys/wait.h>
  20 #endif
  21 #include "qapi/qmp/json-streamer.h"
  22 #include "qapi/qmp/json-parser.h"
  23 #include "qapi/qmp/qint.h"
  24 #include "qapi/qmp/qjson.h"
  25 #include "qga/guest-agent-core.h"
  26 #include "qemu/module.h"
  27 #include "signal.h"
  28 #include "qapi/qmp/qerror.h"
  29 #include "qapi/qmp/dispatch.h"
  30 #include "qga/channel.h"
  31 #include "qemu/bswap.h"
  32 #ifdef _WIN32
  33 #include "qga/service-win32.h"
  34 #include "qga/vss-win32.h"
  35 #endif
  36 #ifdef __linux__
  37 #include <linux/fs.h>
  38 #ifdef FIFREEZE
  39 #define CONFIG_FSFREEZE
  40 #endif
  41 #endif
  42
  43 #ifndef _WIN32
  44 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
  45 #define QGA_STATE_RELATIVE_DIR  "run"
  46 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
  47 #else
  48 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
  49 #define QGA_STATE_RELATIVE_DIR  "qemu-ga"
  50 #define QGA_SERIAL_PATH_DEFAULT "COM1"
  51 #endif
  52 #ifdef CONFIG_FSFREEZE
  53 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
  54 #endif
  55 #define QGA_SENTINEL_BYTE 0xFF
  56 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
  57
  58 static struct {
  59     const char *state_dir;
  60     const char *pidfile;
  61 } dfl_pathnames;
  62
  63 typedef struct GAPersistentState {
  64 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
  65     int64_t fd_counter;
  66 } GAPersistentState;
  67
  68 struct GAState {
  69     JSONMessageParser parser;
  70     GMainLoop *main_loop;
  71     GAChannel *channel;
  72     bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
  73     GACommandState *command_state;
  74     GLogLevelFlags log_level;
  75     FILE *log_file;
  76     bool logging_enabled;
  77 #ifdef _WIN32
  78     GAService service;
  79 #endif
  80     bool delimit_response;
  81     bool frozen;
  82     GList *blacklist;
  83     char *state_filepath_isfrozen;
  84     struct {
  85         const char *log_filepath;
  86         const char *pid_filepath;
  87     } deferred_options;
  88 #ifdef CONFIG_FSFREEZE
  89     const char *fsfreeze_hook;
  90 #endif
  91     gchar *pstate_filepath;
  92     GAPersistentState pstate;
  93 };
  94
  95 struct GAState *ga_state;
  96
  97 /* commands that are safe to issue while filesystems are frozen */
  98 static const char *ga_freeze_whitelist[] = {
  99     "guest-ping",
 100     "guest-info",
 101     "guest-sync",
 102     "guest-sync-delimited",
 103     "guest-fsfreeze-status",
 104     "guest-fsfreeze-thaw",
 105     NULL
 106 };
 107
 108 #ifdef _WIN32
 109 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 110                                   LPVOID ctx);
 111 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
 112 #endif
 113
 114 static void
 115 init_dfl_pathnames(void)
 116 {
 117     g_assert(dfl_pathnames.state_dir == NULL);
 118     g_assert(dfl_pathnames.pidfile == NULL);
 119     dfl_pathnames.state_dir = qemu_get_local_state_pathname(
 120       QGA_STATE_RELATIVE_DIR);
 121     dfl_pathnames.pidfile   = qemu_get_local_state_pathname(
 122       QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
 123 }
 124
 125 static void quit_handler(int sig)
 126 {
 127     /* if we're frozen, don't exit unless we're absolutely forced to,
 128      * because it's basically impossible for graceful exit to complete
 129      * unless all log/pid files are on unfreezable filesystems. there's
 130      * also a very likely chance killing the agent before unfreezing
 131      * the filesystems is a mistake (or will be viewed as one later).
 132      */
 133     if (ga_is_frozen(ga_state)) {
 134         return;
 135     }
 136     g_debug("received signal num %d, quitting", sig);
 137
 138     if (g_main_loop_is_running(ga_state->main_loop)) {
 139         g_main_loop_quit(ga_state->main_loop);
 140     }
 141 }
 142
 143 #ifndef _WIN32
 144 static gboolean register_signal_handlers(void)
 145 {
 146     struct sigaction sigact;
 147     int ret;
 148
 149     memset(&sigact, 0, sizeof(struct sigaction));
 150     sigact.sa_handler = quit_handler;
 151
 152     ret = sigaction(SIGINT, &sigact, NULL);
 153     if (ret == -1) {
 154         g_error("error configuring signal handler: %s", strerror(errno));
 155     }
 156     ret = sigaction(SIGTERM, &sigact, NULL);
 157     if (ret == -1) {
 158         g_error("error configuring signal handler: %s", strerror(errno));
 159     }
 160
 161     sigact.sa_handler = SIG_IGN;
 162     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
 163         g_error("error configuring SIGPIPE signal handler: %s",
 164                 strerror(errno));
 165     }
 166
 167     return true;
 168 }
 169
 170 /* TODO: use this in place of all post-fork() fclose(std*) callers */
 171 void reopen_fd_to_null(int fd)
 172 {
 173     int nullfd;
 174
 175     nullfd = open("/dev/null", O_RDWR);
 176     if (nullfd < 0) {
 177         return;
 178     }
 179
 180     dup2(nullfd, fd);
 181
 182     if (nullfd != fd) {
 183         close(nullfd);
 184     }
 185 }
 186 #endif
 187
 188 static void usage(const char *cmd)
 189 {
 190     printf(
 191 "Usage: %s [-m <method> -p <path>] [<options>]\n"
 192 "QEMU Guest Agent %s\n"
 193 "\n"
 194 "  -m, --method      transport method: one of unix-listen, virtio-serial, or\n"
 195 "                    isa-serial (virtio-serial is the default)\n"
 196 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
 197 "                    %s,\n"
 198 "                    the default for isa-serial is:\n"
 199 "                    %s)\n"
 200 "  -l, --logfile     set logfile path, logs to stderr by default\n"
 201 "  -f, --pidfile     specify pidfile (default is %s)\n"
 202 #ifdef CONFIG_FSFREEZE
 203 "  -F, --fsfreeze-hook\n"
 204 "                    enable fsfreeze hook. Accepts an optional argument that\n"
 205 "                    specifies script to run on freeze/thaw. Script will be\n"
 206 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
 207 "                    (default is %s)\n"
 208 "                    If using -F with an argument, do not follow -F with a\n"
 209 "                    space.\n"
 210 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
 211 #endif
 212 "  -t, --statedir    specify dir to store state information (absolute paths\n"
 213 "                    only, default is %s)\n"
 214 "  -v, --verbose     log extra debugging information\n"
 215 "  -V, --version     print version information and exit\n"
 216 "  -d, --daemonize   become a daemon\n"
 217 #ifdef _WIN32
 218 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 219 #endif
 220 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
 221 "                    to list available RPCs)\n"
 222 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 223 "                    options / command-line parameters to stdout\n"
 224 "  -h, --help        display this help and exit\n"
 225 "\n"
 226 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
 227     , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
 228     dfl_pathnames.pidfile,
 229 #ifdef CONFIG_FSFREEZE
 230     QGA_FSFREEZE_HOOK_DEFAULT,
 231 #endif
 232     dfl_pathnames.state_dir);
 233 }
 234
 235 static const char *ga_log_level_str(GLogLevelFlags level)
 236 {
 237     switch (level & G_LOG_LEVEL_MASK) {
 238         case G_LOG_LEVEL_ERROR:
 239             return "error";
 240         case G_LOG_LEVEL_CRITICAL:
 241             return "critical";
 242         case G_LOG_LEVEL_WARNING:
 243             return "warning";
 244         case G_LOG_LEVEL_MESSAGE:
 245             return "message";
 246         case G_LOG_LEVEL_INFO:
 247             return "info";
 248         case G_LOG_LEVEL_DEBUG:
 249             return "debug";
 250         default:
 251             return "user";
 252     }
 253 }
 254
 255 bool ga_logging_enabled(GAState *s)
 256 {
 257     return s->logging_enabled;
 258 }
 259
 260 void ga_disable_logging(GAState *s)
 261 {
 262     s->logging_enabled = false;
 263 }
 264
 265 void ga_enable_logging(GAState *s)
 266 {
 267     s->logging_enabled = true;
 268 }
 269
 270 static void ga_log(const gchar *domain, GLogLevelFlags level,
 271                    const gchar *msg, gpointer opaque)
 272 {
 273     GAState *s = opaque;
 274     GTimeVal time;
 275     const char *level_str = ga_log_level_str(level);
 276
 277     if (!ga_logging_enabled(s)) {
 278         return;
 279     }
 280
 281     level &= G_LOG_LEVEL_MASK;
 282 #ifndef _WIN32
 283     if (g_strcmp0(domain, "syslog") == 0) {
 284         syslog(LOG_INFO, "%s: %s", level_str, msg);
 285     } else if (level & s->log_level) {
 286 #else
 287     if (level & s->log_level) {
 288 #endif
 289         g_get_current_time(&time);
 290         fprintf(s->log_file,
 291                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
 292         fflush(s->log_file);
 293     }
 294 }
 295
 296 void ga_set_response_delimited(GAState *s)
 297 {
 298     s->delimit_response = true;
 299 }
 300
 301 static FILE *ga_open_logfile(const char *logfile)
 302 {
 303     FILE *f;
 304
 305     f = fopen(logfile, "a");
 306     if (!f) {
 307         return NULL;
 308     }
 309
 310     qemu_set_cloexec(fileno(f));
 311     return f;
 312 }
 313
 314 #ifndef _WIN32
 315 static bool ga_open_pidfile(const char *pidfile)
 316 {
 317     int pidfd;
 318     char pidstr[32];
 319
 320     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
 321     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
 322         g_critical("Cannot lock pid file, %s", strerror(errno));
 323         if (pidfd != -1) {
 324             close(pidfd);
 325         }
 326         return false;
 327     }
 328
 329     if (ftruncate(pidfd, 0)) {
 330         g_critical("Failed to truncate pid file");
 331         goto fail;
 332     }
 333     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
 334     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
 335         g_critical("Failed to write pid file");
 336         goto fail;
 337     }
 338
 339     /* keep pidfile open & locked forever */
 340     return true;
 341
 342 fail:
 343     unlink(pidfile);
 344     close(pidfd);
 345     return false;
 346 }
 347 #else /* _WIN32 */
 348 static bool ga_open_pidfile(const char *pidfile)
 349 {
 350     return true;
 351 }
 352 #endif
 353
 354 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
 355 {
 356     return strcmp(str1, str2);
 357 }
 358
 359 /* disable commands that aren't safe for fsfreeze */
 360 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
 361 {
 362     bool whitelisted = false;
 363     int i = 0;
 364     const char *name = qmp_command_name(cmd);
 365
 366     while (ga_freeze_whitelist[i] != NULL) {
 367         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
 368             whitelisted = true;
 369         }
 370         i++;
 371     }
 372     if (!whitelisted) {
 373         g_debug("disabling command: %s", name);
 374         qmp_disable_command(name);
 375     }
 376 }
 377
 378 /* [re-]enable all commands, except those explicitly blacklisted by user */
 379 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
 380 {
 381     GList *blacklist = opaque;
 382     const char *name = qmp_command_name(cmd);
 383
 384     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
 385         !qmp_command_is_enabled(cmd)) {
 386         g_debug("enabling command: %s", name);
 387         qmp_enable_command(name);
 388     }
 389 }
 390
 391 static bool ga_create_file(const char *path)
 392 {
 393     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
 394     if (fd == -1) {
 395         g_warning("unable to open/create file %s: %s", path, strerror(errno));
 396         return false;
 397     }
 398     close(fd);
 399     return true;
 400 }
 401
 402 static bool ga_delete_file(const char *path)
 403 {
 404     int ret = unlink(path);
 405     if (ret == -1) {
 406         g_warning("unable to delete file: %s: %s", path, strerror(errno));
 407         return false;
 408     }
 409
 410     return true;
 411 }
 412
 413 bool ga_is_frozen(GAState *s)
 414 {
 415     return s->frozen;
 416 }
 417
 418 void ga_set_frozen(GAState *s)
 419 {
 420     if (ga_is_frozen(s)) {
 421         return;
 422     }
 423     /* disable all non-whitelisted (for frozen state) commands */
 424     qmp_for_each_command(ga_disable_non_whitelisted, NULL);
 425     g_warning("disabling logging due to filesystem freeze");
 426     ga_disable_logging(s);
 427     s->frozen = true;
 428     if (!ga_create_file(s->state_filepath_isfrozen)) {
 429         g_warning("unable to create %s, fsfreeze may not function properly",
 430                   s->state_filepath_isfrozen);
 431     }
 432 }
 433
 434 void ga_unset_frozen(GAState *s)
 435 {
 436     if (!ga_is_frozen(s)) {
 437         return;
 438     }
 439
 440     /* if we delayed creation/opening of pid/log files due to being
 441      * in a frozen state at start up, do it now
 442      */
 443     if (s->deferred_options.log_filepath) {
 444         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
 445         if (!s->log_file) {
 446             s->log_file = stderr;
 447         }
 448         s->deferred_options.log_filepath = NULL;
 449     }
 450     ga_enable_logging(s);
 451     g_warning("logging re-enabled due to filesystem unfreeze");
 452     if (s->deferred_options.pid_filepath) {
 453         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
 454             g_warning("failed to create/open pid file");
 455         }
 456         s->deferred_options.pid_filepath = NULL;
 457     }
 458
 459     /* enable all disabled, non-blacklisted commands */
 460     qmp_for_each_command(ga_enable_non_blacklisted, s->blacklist);
 461     s->frozen = false;
 462     if (!ga_delete_file(s->state_filepath_isfrozen)) {
 463         g_warning("unable to delete %s, fsfreeze may not function properly",
 464                   s->state_filepath_isfrozen);
 465     }
 466 }
 467
 468 #ifdef CONFIG_FSFREEZE
 469 const char *ga_fsfreeze_hook(GAState *s)
 470 {
 471     return s->fsfreeze_hook;
 472 }
 473 #endif
 474
 475 static void become_daemon(const char *pidfile)
 476 {
 477 #ifndef _WIN32
 478     pid_t pid, sid;
 479
 480     pid = fork();
 481     if (pid < 0) {
 482         exit(EXIT_FAILURE);
 483     }
 484     if (pid > 0) {
 485         exit(EXIT_SUCCESS);
 486     }
 487
 488     if (pidfile) {
 489         if (!ga_open_pidfile(pidfile)) {
 490             g_critical("failed to create pidfile");
 491             exit(EXIT_FAILURE);
 492         }
 493     }
 494
 495     umask(S_IRWXG | S_IRWXO);
 496     sid = setsid();
 497     if (sid < 0) {
 498         goto fail;
 499     }
 500     if ((chdir("/")) < 0) {
 501         goto fail;
 502     }
 503
 504     reopen_fd_to_null(STDIN_FILENO);
 505     reopen_fd_to_null(STDOUT_FILENO);
 506     reopen_fd_to_null(STDERR_FILENO);
 507     return;
 508
 509 fail:
 510     if (pidfile) {
 511         unlink(pidfile);
 512     }
 513     g_critical("failed to daemonize");
 514     exit(EXIT_FAILURE);
 515 #endif
 516 }
 517
 518 static int send_response(GAState *s, QObject *payload)
 519 {
 520     const char *buf;
 521     QString *payload_qstr, *response_qstr;
 522     GIOStatus status;
 523
 524     g_assert(payload && s->channel);
 525
 526     payload_qstr = qobject_to_json(payload);
 527     if (!payload_qstr) {
 528         return -EINVAL;
 529     }
 530
 531     if (s->delimit_response) {
 532         s->delimit_response = false;
 533         response_qstr = qstring_new();
 534         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
 535         qstring_append(response_qstr, qstring_get_str(payload_qstr));
 536         QDECREF(payload_qstr);
 537     } else {
 538         response_qstr = payload_qstr;
 539     }
 540
 541     qstring_append_chr(response_qstr, '\n');
 542     buf = qstring_get_str(response_qstr);
 543     status = ga_channel_write_all(s->channel, buf, strlen(buf));
 544     QDECREF(response_qstr);
 545     if (status != G_IO_STATUS_NORMAL) {
 546         return -EIO;
 547     }
 548
 549     return 0;
 550 }
 551
 552 static void process_command(GAState *s, QDict *req)
 553 {
 554     QObject *rsp = NULL;
 555     int ret;
 556
 557     g_assert(req);
 558     g_debug("processing command");
 559     rsp = qmp_dispatch(QOBJECT(req));
 560     if (rsp) {
 561         ret = send_response(s, rsp);
 562         if (ret) {
 563             g_warning("error sending response: %s", strerror(ret));
 564         }
 565         qobject_decref(rsp);
 566     }
 567 }
 568
 569 /* handle requests/control events coming in over the channel */
 570 static void process_event(JSONMessageParser *parser, GQueue *tokens)
 571 {
 572     GAState *s = container_of(parser, GAState, parser);
 573     QDict *qdict;
 574     Error *err = NULL;
 575     int ret;
 576
 577     g_assert(s && parser);
 578
 579     g_debug("process_event: called");
 580     qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
 581     if (err || !qdict) {
 582         QDECREF(qdict);
 583         qdict = qdict_new();
 584         if (!err) {
 585             g_warning("failed to parse event: unknown error");
 586             error_setg(&err, QERR_JSON_PARSING);
 587         } else {
 588             g_warning("failed to parse event: %s", error_get_pretty(err));
 589         }
 590         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 591         error_free(err);
 592     }
 593
 594     /* handle host->guest commands */
 595     if (qdict_haskey(qdict, "execute")) {
 596         process_command(s, qdict);
 597     } else {
 598         if (!qdict_haskey(qdict, "error")) {
 599             QDECREF(qdict);
 600             qdict = qdict_new();
 601             g_warning("unrecognized payload format");
 602             error_setg(&err, QERR_UNSUPPORTED);
 603             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 604             error_free(err);
 605         }
 606         ret = send_response(s, QOBJECT(qdict));
 607         if (ret < 0) {
 608             g_warning("error sending error response: %s", strerror(-ret));
 609         }
 610     }
 611
 612     QDECREF(qdict);
 613 }
 614
 615 /* false return signals GAChannel to close the current client connection */
 616 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
 617 {
 618     GAState *s = data;
 619     gchar buf[QGA_READ_COUNT_DEFAULT+1];
 620     gsize count;
 621     GError *err = NULL;
 622     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
 623     if (err != NULL) {
 624         g_warning("error reading channel: %s", err->message);
 625         g_error_free(err);
 626         return false;
 627     }
 628     switch (status) {
 629     case G_IO_STATUS_ERROR:
 630         g_warning("error reading channel");
 631         return false;
 632     case G_IO_STATUS_NORMAL:
 633         buf[count] = 0;
 634         g_debug("read data, count: %d, data: %s", (int)count, buf);
 635         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
 636         break;
 637     case G_IO_STATUS_EOF:
 638         g_debug("received EOF");
 639         if (!s->virtio) {
 640             return false;
 641         }
 642         /* fall through */
 643     case G_IO_STATUS_AGAIN:
 644         /* virtio causes us to spin here when no process is attached to
 645          * host-side chardev. sleep a bit to mitigate this
 646          */
 647         if (s->virtio) {
 648             usleep(100*1000);
 649         }
 650         return true;
 651     default:
 652         g_warning("unknown channel read status, closing");
 653         return false;
 654     }
 655     return true;
 656 }
 657
 658 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
 659 {
 660     GAChannelMethod channel_method;
 661
 662     if (strcmp(method, "virtio-serial") == 0) {
 663         s->virtio = true; /* virtio requires special handling in some cases */
 664         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
 665     } else if (strcmp(method, "isa-serial") == 0) {
 666         channel_method = GA_CHANNEL_ISA_SERIAL;
 667     } else if (strcmp(method, "unix-listen") == 0) {
 668         channel_method = GA_CHANNEL_UNIX_LISTEN;
 669     } else {
 670         g_critical("unsupported channel method/type: %s", method);
 671         return false;
 672     }
 673
 674     s->channel = ga_channel_new(channel_method, path, channel_event_cb, s);
 675     if (!s->channel) {
 676         g_critical("failed to create guest agent channel");
 677         return false;
 678     }
 679
 680     return true;
 681 }
 682
 683 #ifdef _WIN32
 684 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 685                                   LPVOID ctx)
 686 {
 687     DWORD ret = NO_ERROR;
 688     GAService *service = &ga_state->service;
 689
 690     switch (ctrl)
 691     {
 692         case SERVICE_CONTROL_STOP:
 693         case SERVICE_CONTROL_SHUTDOWN:
 694             quit_handler(SIGTERM);
 695             service->status.dwCurrentState = SERVICE_STOP_PENDING;
 696             SetServiceStatus(service->status_handle, &service->status);
 697             break;
 698
 699         default:
 700             ret = ERROR_CALL_NOT_IMPLEMENTED;
 701     }
 702     return ret;
 703 }
 704
 705 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
 706 {
 707     GAService *service = &ga_state->service;
 708
 709     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
 710         service_ctrl_handler, NULL);
 711
 712     if (service->status_handle == 0) {
 713         g_critical("Failed to register extended requests function!\n");
 714         return;
 715     }
 716
 717     service->status.dwServiceType = SERVICE_WIN32;
 718     service->status.dwCurrentState = SERVICE_RUNNING;
 719     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 720     service->status.dwWin32ExitCode = NO_ERROR;
 721     service->status.dwServiceSpecificExitCode = NO_ERROR;
 722     service->status.dwCheckPoint = 0;
 723     service->status.dwWaitHint = 0;
 724     SetServiceStatus(service->status_handle, &service->status);
 725
 726     g_main_loop_run(ga_state->main_loop);
 727
 728     service->status.dwCurrentState = SERVICE_STOPPED;
 729     SetServiceStatus(service->status_handle, &service->status);
 730 }
 731 #endif
 732
 733 static void set_persistent_state_defaults(GAPersistentState *pstate)
 734 {
 735     g_assert(pstate);
 736     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
 737 }
 738
 739 static void persistent_state_from_keyfile(GAPersistentState *pstate,
 740                                           GKeyFile *keyfile)
 741 {
 742     g_assert(pstate);
 743     g_assert(keyfile);
 744     /* if any fields are missing, either because the file was tampered with
 745      * by agents of chaos, or because the field wasn't present at the time the
 746      * file was created, the best we can ever do is start over with the default
 747      * values. so load them now, and ignore any errors in accessing key-value
 748      * pairs
 749      */
 750     set_persistent_state_defaults(pstate);
 751
 752     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
 753         pstate->fd_counter =
 754             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
 755     }
 756 }
 757
 758 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
 759                                         GKeyFile *keyfile)
 760 {
 761     g_assert(pstate);
 762     g_assert(keyfile);
 763
 764     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
 765 }
 766
 767 static gboolean write_persistent_state(const GAPersistentState *pstate,
 768                                        const gchar *path)
 769 {
 770     GKeyFile *keyfile = g_key_file_new();
 771     GError *gerr = NULL;
 772     gboolean ret = true;
 773     gchar *data = NULL;
 774     gsize data_len;
 775
 776     g_assert(pstate);
 777
 778     persistent_state_to_keyfile(pstate, keyfile);
 779     data = g_key_file_to_data(keyfile, &data_len, &gerr);
 780     if (gerr) {
 781         g_critical("failed to convert persistent state to string: %s",
 782                    gerr->message);
 783         ret = false;
 784         goto out;
 785     }
 786
 787     g_file_set_contents(path, data, data_len, &gerr);
 788     if (gerr) {
 789         g_critical("failed to write persistent state to %s: %s",
 790                     path, gerr->message);
 791         ret = false;
 792         goto out;
 793     }
 794
 795 out:
 796     if (gerr) {
 797         g_error_free(gerr);
 798     }
 799     if (keyfile) {
 800         g_key_file_free(keyfile);
 801     }
 802     g_free(data);
 803     return ret;
 804 }
 805
 806 static gboolean read_persistent_state(GAPersistentState *pstate,
 807                                       const gchar *path, gboolean frozen)
 808 {
 809     GKeyFile *keyfile = NULL;
 810     GError *gerr = NULL;
 811     struct stat st;
 812     gboolean ret = true;
 813
 814     g_assert(pstate);
 815
 816     if (stat(path, &st) == -1) {
 817         /* it's okay if state file doesn't exist, but any other error
 818          * indicates a permissions issue or some other misconfiguration
 819          * that we likely won't be able to recover from.
 820          */
 821         if (errno != ENOENT) {
 822             g_critical("unable to access state file at path %s: %s",
 823                        path, strerror(errno));
 824             ret = false;
 825             goto out;
 826         }
 827
 828         /* file doesn't exist. initialize state to default values and
 829          * attempt to save now. (we could wait till later when we have
 830          * modified state we need to commit, but if there's a problem,
 831          * such as a missing parent directory, we want to catch it now)
 832          *
 833          * there is a potential scenario where someone either managed to
 834          * update the agent from a version that didn't use a key store
 835          * while qemu-ga thought the filesystem was frozen, or
 836          * deleted the key store prior to issuing a fsfreeze, prior
 837          * to restarting the agent. in this case we go ahead and defer
 838          * initial creation till we actually have modified state to
 839          * write, otherwise fail to recover from freeze.
 840          */
 841         set_persistent_state_defaults(pstate);
 842         if (!frozen) {
 843             ret = write_persistent_state(pstate, path);
 844             if (!ret) {
 845                 g_critical("unable to create state file at path %s", path);
 846                 ret = false;
 847                 goto out;
 848             }
 849         }
 850         ret = true;
 851         goto out;
 852     }
 853
 854     keyfile = g_key_file_new();
 855     g_key_file_load_from_file(keyfile, path, 0, &gerr);
 856     if (gerr) {
 857         g_critical("error loading persistent state from path: %s, %s",
 858                    path, gerr->message);
 859         ret = false;
 860         goto out;
 861     }
 862
 863     persistent_state_from_keyfile(pstate, keyfile);
 864
 865 out:
 866     if (keyfile) {
 867         g_key_file_free(keyfile);
 868     }
 869     if (gerr) {
 870         g_error_free(gerr);
 871     }
 872
 873     return ret;
 874 }
 875
 876 int64_t ga_get_fd_handle(GAState *s, Error **errp)
 877 {
 878     int64_t handle;
 879
 880     g_assert(s->pstate_filepath);
 881     /* we blacklist commands and avoid operations that potentially require
 882      * writing to disk when we're in a frozen state. this includes opening
 883      * new files, so we should never get here in that situation
 884      */
 885     g_assert(!ga_is_frozen(s));
 886
 887     handle = s->pstate.fd_counter++;
 888
 889     /* This should never happen on a reasonable timeframe, as guest-file-open
 890      * would have to be issued 2^63 times */
 891     if (s->pstate.fd_counter == INT64_MAX) {
 892         abort();
 893     }
 894
 895     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
 896         error_setg(errp, "failed to commit persistent state to disk");
 897         return -1;
 898     }
 899
 900     return handle;
 901 }
 902
 903 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
 904 {
 905     printf("%s\n", qmp_command_name(cmd));
 906 }
 907
 908 static GList *split_list(const gchar *str, const gchar *delim)
 909 {
 910     GList *list = NULL;
 911     int i;
 912     gchar **strv;
 913
 914     strv = g_strsplit(str, delim, -1);
 915     for (i = 0; strv[i]; i++) {
 916         list = g_list_prepend(list, strv[i]);
 917     }
 918     g_free(strv);
 919
 920     return list;
 921 }
 922
 923 typedef struct GAConfig {
 924     char *channel_path;
 925     char *method;
 926     char *log_filepath;
 927     char *pid_filepath;
 928 #ifdef CONFIG_FSFREEZE
 929     char *fsfreeze_hook;
 930 #endif
 931     char *state_dir;
 932 #ifdef _WIN32
 933     const char *service;
 934 #endif
 935     gchar *bliststr; /* blacklist may point to this string */
 936     GList *blacklist;
 937     int daemonize;
 938     GLogLevelFlags log_level;
 939     int dumpconf;
 940 } GAConfig;
 941
 942 static void config_load(GAConfig *config)
 943 {
 944     GError *gerr = NULL;
 945     GKeyFile *keyfile;
 946     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
 947
 948     /* read system config */
 949     keyfile = g_key_file_new();
 950     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
 951         goto end;
 952     }
 953     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
 954         config->daemonize =
 955             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
 956     }
 957     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
 958         config->method =
 959             g_key_file_get_string(keyfile, "general", "method", &gerr);
 960     }
 961     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
 962         config->channel_path =
 963             g_key_file_get_string(keyfile, "general", "path", &gerr);
 964     }
 965     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
 966         config->log_filepath =
 967             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
 968     }
 969     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
 970         config->pid_filepath =
 971             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
 972     }
 973 #ifdef CONFIG_FSFREEZE
 974     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
 975         config->fsfreeze_hook =
 976             g_key_file_get_string(keyfile,
 977                                   "general", "fsfreeze-hook", &gerr);
 978     }
 979 #endif
 980     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
 981         config->state_dir =
 982             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
 983     }
 984     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
 985         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
 986         /* enable all log levels */
 987         config->log_level = G_LOG_LEVEL_MASK;
 988     }
 989     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
 990         config->bliststr =
 991             g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
 992         config->blacklist = g_list_concat(config->blacklist,
 993                                           split_list(config->bliststr, ","));
 994     }
 995
 996 end:
 997     g_key_file_free(keyfile);
 998     if (gerr &&
 999         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1000         g_critical("error loading configuration from path: %s, %s",
1001                    QGA_CONF_DEFAULT, gerr->message);
1002         exit(EXIT_FAILURE);
1003     }
1004     g_clear_error(&gerr);
1005 }
1006
1007 static gchar *list_join(GList *list, const gchar separator)
1008 {
1009     GString *str = g_string_new("");
1010
1011     while (list) {
1012         str = g_string_append(str, (gchar *)list->data);
1013         list = g_list_next(list);
1014         if (list) {
1015             str = g_string_append_c(str, separator);
1016         }
1017     }
1018
1019     return g_string_free(str, FALSE);
1020 }
1021
1022 static void config_dump(GAConfig *config)
1023 {
1024     GError *error = NULL;
1025     GKeyFile *keyfile;
1026     gchar *tmp;
1027
1028     keyfile = g_key_file_new();
1029     g_assert(keyfile);
1030
1031     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1032     g_key_file_set_string(keyfile, "general", "method", config->method);
1033     g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1034     if (config->log_filepath) {
1035         g_key_file_set_string(keyfile, "general", "logfile",
1036                               config->log_filepath);
1037     }
1038     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1039 #ifdef CONFIG_FSFREEZE
1040     if (config->fsfreeze_hook) {
1041         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1042                               config->fsfreeze_hook);
1043     }
1044 #endif
1045     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1046     g_key_file_set_boolean(keyfile, "general", "verbose",
1047                            config->log_level == G_LOG_LEVEL_MASK);
1048     tmp = list_join(config->blacklist, ',');
1049     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1050     g_free(tmp);
1051
1052     tmp = g_key_file_to_data(keyfile, NULL, &error);
1053     printf("%s", tmp);
1054
1055     g_free(tmp);
1056     g_key_file_free(keyfile);
1057 }
1058
1059 static void config_parse(GAConfig *config, int argc, char **argv)
1060 {
1061     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1062     int opt_ind = 0, ch;
1063     const struct option lopt[] = {
1064         { "help", 0, NULL, 'h' },
1065         { "version", 0, NULL, 'V' },
1066         { "dump-conf", 0, NULL, 'D' },
1067         { "logfile", 1, NULL, 'l' },
1068         { "pidfile", 1, NULL, 'f' },
1069 #ifdef CONFIG_FSFREEZE
1070         { "fsfreeze-hook", 2, NULL, 'F' },
1071 #endif
1072         { "verbose", 0, NULL, 'v' },
1073         { "method", 1, NULL, 'm' },
1074         { "path", 1, NULL, 'p' },
1075         { "daemonize", 0, NULL, 'd' },
1076         { "blacklist", 1, NULL, 'b' },
1077 #ifdef _WIN32
1078         { "service", 1, NULL, 's' },
1079 #endif
1080         { "statedir", 1, NULL, 't' },
1081         { NULL, 0, NULL, 0 }
1082     };
1083
1084     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1085         switch (ch) {
1086         case 'm':
1087             g_free(config->method);
1088             config->method = g_strdup(optarg);
1089             break;
1090         case 'p':
1091             g_free(config->channel_path);
1092             config->channel_path = g_strdup(optarg);
1093             break;
1094         case 'l':
1095             g_free(config->log_filepath);
1096             config->log_filepath = g_strdup(optarg);
1097             break;
1098         case 'f':
1099             g_free(config->pid_filepath);
1100             config->pid_filepath = g_strdup(optarg);
1101             break;
1102 #ifdef CONFIG_FSFREEZE
1103         case 'F':
1104             g_free(config->fsfreeze_hook);
1105             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1106             break;
1107 #endif
1108         case 't':
1109             g_free(config->state_dir);
1110             config->state_dir = g_strdup(optarg);
1111             break;
1112         case 'v':
1113             /* enable all log levels */
1114             config->log_level = G_LOG_LEVEL_MASK;
1115             break;
1116         case 'V':
1117             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1118             exit(EXIT_SUCCESS);
1119         case 'd':
1120             config->daemonize = 1;
1121             break;
1122         case 'D':
1123             config->dumpconf = 1;
1124             break;
1125         case 'b': {
1126             if (is_help_option(optarg)) {
1127                 qmp_for_each_command(ga_print_cmd, NULL);
1128                 exit(EXIT_SUCCESS);
1129             }
1130             config->blacklist = g_list_concat(config->blacklist,
1131                                              split_list(optarg, ","));
1132             break;
1133         }
1134 #ifdef _WIN32
1135         case 's':
1136             config->service = optarg;
1137             if (strcmp(config->service, "install") == 0) {
1138                 if (ga_install_vss_provider()) {
1139                     exit(EXIT_FAILURE);
1140                 }
1141                 if (ga_install_service(config->channel_path,
1142                                        config->log_filepath, config->state_dir)) {
1143                     exit(EXIT_FAILURE);
1144                 }
1145                 exit(EXIT_SUCCESS);
1146             } else if (strcmp(config->service, "uninstall") == 0) {
1147                 ga_uninstall_vss_provider();
1148                 exit(ga_uninstall_service());
1149             } else if (strcmp(config->service, "vss-install") == 0) {
1150                 if (ga_install_vss_provider()) {
1151                     exit(EXIT_FAILURE);
1152                 }
1153                 exit(EXIT_SUCCESS);
1154             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1155                 ga_uninstall_vss_provider();
1156                 exit(EXIT_SUCCESS);
1157             } else {
1158                 printf("Unknown service command.\n");
1159                 exit(EXIT_FAILURE);
1160             }
1161             break;
1162 #endif
1163         case 'h':
1164             usage(argv[0]);
1165             exit(EXIT_SUCCESS);
1166         case '?':
1167             g_print("Unknown option, try '%s --help' for more information.\n",
1168                     argv[0]);
1169             exit(EXIT_FAILURE);
1170         }
1171     }
1172 }
1173
1174 static void config_free(GAConfig *config)
1175 {
1176     g_free(config->method);
1177     g_free(config->log_filepath);
1178     g_free(config->pid_filepath);
1179     g_free(config->state_dir);
1180     g_free(config->channel_path);
1181     g_free(config->bliststr);
1182 #ifdef CONFIG_FSFREEZE
1183     g_free(config->fsfreeze_hook);
1184 #endif
1185     g_free(config);
1186 }
1187
1188 static bool check_is_frozen(GAState *s)
1189 {
1190 #ifndef _WIN32
1191     /* check if a previous instance of qemu-ga exited with filesystems' state
1192      * marked as frozen. this could be a stale value (a non-qemu-ga process
1193      * or reboot may have since unfrozen them), but better to require an
1194      * uneeded unfreeze than to risk hanging on start-up
1195      */
1196     struct stat st;
1197     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1198         /* it's okay if the file doesn't exist, but if we can't access for
1199          * some other reason, such as permissions, there's a configuration
1200          * that needs to be addressed. so just bail now before we get into
1201          * more trouble later
1202          */
1203         if (errno != ENOENT) {
1204             g_critical("unable to access state file at path %s: %s",
1205                        s->state_filepath_isfrozen, strerror(errno));
1206             return EXIT_FAILURE;
1207         }
1208     } else {
1209         g_warning("previous instance appears to have exited with frozen"
1210                   " filesystems. deferring logging/pidfile creation and"
1211                   " disabling non-fsfreeze-safe commands until"
1212                   " guest-fsfreeze-thaw is issued, or filesystems are"
1213                   " manually unfrozen and the file %s is removed",
1214                   s->state_filepath_isfrozen);
1215         return true;
1216     }
1217 #endif
1218     return false;
1219 }
1220
1221 static int run_agent(GAState *s, GAConfig *config)
1222 {
1223     ga_state = s;
1224
1225     g_log_set_default_handler(ga_log, s);
1226     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1227     ga_enable_logging(s);
1228
1229 #ifdef _WIN32
1230     /* On win32 the state directory is application specific (be it the default
1231      * or a user override). We got past the command line parsing; let's create
1232      * the directory (with any intermediate directories). If we run into an
1233      * error later on, we won't try to clean up the directory, it is considered
1234      * persistent.
1235      */
1236     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1237         g_critical("unable to create (an ancestor of) the state directory"
1238                    " '%s': %s", config->state_dir, strerror(errno));
1239         return EXIT_FAILURE;
1240     }
1241 #endif
1242
1243     if (ga_is_frozen(s)) {
1244         if (config->daemonize) {
1245             /* delay opening/locking of pidfile till filesystems are unfrozen */
1246             s->deferred_options.pid_filepath = config->pid_filepath;
1247             become_daemon(NULL);
1248         }
1249         if (config->log_filepath) {
1250             /* delay opening the log file till filesystems are unfrozen */
1251             s->deferred_options.log_filepath = config->log_filepath;
1252         }
1253         ga_disable_logging(s);
1254         qmp_for_each_command(ga_disable_non_whitelisted, NULL);
1255     } else {
1256         if (config->daemonize) {
1257             become_daemon(config->pid_filepath);
1258         }
1259         if (config->log_filepath) {
1260             FILE *log_file = ga_open_logfile(config->log_filepath);
1261             if (!log_file) {
1262                 g_critical("unable to open specified log file: %s",
1263                            strerror(errno));
1264                 return EXIT_FAILURE;
1265             }
1266             s->log_file = log_file;
1267         }
1268     }
1269
1270     /* load persistent state from disk */
1271     if (!read_persistent_state(&s->pstate,
1272                                s->pstate_filepath,
1273                                ga_is_frozen(s))) {
1274         g_critical("failed to load persistent state");
1275         return EXIT_FAILURE;
1276     }
1277
1278     config->blacklist = ga_command_blacklist_init(config->blacklist);
1279     if (config->blacklist) {
1280         GList *l = config->blacklist;
1281         s->blacklist = config->blacklist;
1282         do {
1283             g_debug("disabling command: %s", (char *)l->data);
1284             qmp_disable_command(l->data);
1285             l = g_list_next(l);
1286         } while (l);
1287     }
1288     s->command_state = ga_command_state_new();
1289     ga_command_state_init(s, s->command_state);
1290     ga_command_state_init_all(s->command_state);
1291     json_message_parser_init(&s->parser, process_event);
1292     ga_state = s;
1293 #ifndef _WIN32
1294     if (!register_signal_handlers()) {
1295         g_critical("failed to register signal handlers");
1296         return EXIT_FAILURE;
1297     }
1298 #endif
1299
1300     s->main_loop = g_main_loop_new(NULL, false);
1301     if (!channel_init(ga_state, config->method, config->channel_path)) {
1302         g_critical("failed to initialize guest agent channel");
1303         return EXIT_FAILURE;
1304     }
1305 #ifndef _WIN32
1306     g_main_loop_run(ga_state->main_loop);
1307 #else
1308     if (config->daemonize) {
1309         SERVICE_TABLE_ENTRY service_table[] = {
1310             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1311         StartServiceCtrlDispatcher(service_table);
1312     } else {
1313         g_main_loop_run(ga_state->main_loop);
1314     }
1315 #endif
1316
1317     return EXIT_SUCCESS;
1318 }
1319
1320 static void free_blacklist_entry(gpointer entry, gpointer unused)
1321 {
1322     g_free(entry);
1323 }
1324
1325 int main(int argc, char **argv)
1326 {
1327     int ret = EXIT_SUCCESS;
1328     GAState *s = g_new0(GAState, 1);
1329     GAConfig *config = g_new0(GAConfig, 1);
1330
1331     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1332
1333     module_call_init(MODULE_INIT_QAPI);
1334
1335     init_dfl_pathnames();
1336     config_load(config);
1337     config_parse(config, argc, argv);
1338
1339     if (config->pid_filepath == NULL) {
1340         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1341     }
1342
1343     if (config->state_dir == NULL) {
1344         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1345     }
1346
1347     if (config->method == NULL) {
1348         config->method = g_strdup("virtio-serial");
1349     }
1350
1351     if (config->channel_path == NULL) {
1352         if (strcmp(config->method, "virtio-serial") == 0) {
1353             /* try the default path for the virtio-serial port */
1354             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1355         } else if (strcmp(config->method, "isa-serial") == 0) {
1356             /* try the default path for the serial port - COM1 */
1357             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1358         } else {
1359             g_critical("must specify a path for this channel");
1360             ret = EXIT_FAILURE;
1361             goto end;
1362         }
1363     }
1364
1365     s->log_level = config->log_level;
1366     s->log_file = stderr;
1367 #ifdef CONFIG_FSFREEZE
1368     s->fsfreeze_hook = config->fsfreeze_hook;
1369 #endif
1370     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1371     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1372                                                  config->state_dir);
1373     s->frozen = check_is_frozen(s);
1374
1375     if (config->dumpconf) {
1376         config_dump(config);
1377         goto end;
1378     }
1379
1380     ret = run_agent(s, config);
1381
1382 end:
1383     if (s->command_state) {
1384         ga_command_state_cleanup_all(s->command_state);
1385     }
1386     if (s->channel) {
1387         ga_channel_free(s->channel);
1388     }
1389     g_list_foreach(config->blacklist, free_blacklist_entry, NULL);
1390     g_free(s->pstate_filepath);
1391     g_free(s->state_filepath_isfrozen);
1392
1393     if (config->daemonize) {
1394         unlink(config->pid_filepath);
1395     }
1396
1397     config_free(config);
1398
1399     return ret;
1400 }