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 <stdlib.h>
  14 #include <stdio.h>
  15 #include <stdbool.h>
  16 #include <glib.h>
  17 #include <getopt.h>
  18 #include <glib/gstdio.h>
  19 #ifndef _WIN32
  20 #include <syslog.h>
  21 #include <sys/wait.h>
  22 #include <sys/stat.h>
  23 #endif
  24 #include "qapi/qmp/json-streamer.h"
  25 #include "qapi/qmp/json-parser.h"
  26 #include "qapi/qmp/qint.h"
  27 #include "qapi/qmp/qjson.h"
  28 #include "qga/guest-agent-core.h"
  29 #include "qemu/module.h"
  30 #include "signal.h"
  31 #include "qapi/qmp/qerror.h"
  32 #include "qapi/qmp/dispatch.h"
  33 #include "qga/channel.h"
  34 #include "qemu/bswap.h"
  35 #ifdef _WIN32
  36 #include "qga/service-win32.h"
  37 #include "qga/vss-win32.h"
  38 #endif
  39 #ifdef __linux__
  40 #include <linux/fs.h>
  41 #ifdef FIFREEZE
  42 #define CONFIG_FSFREEZE
  43 #endif
  44 #endif
  45
  46 #ifndef _WIN32
  47 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
  48 #define QGA_STATE_RELATIVE_DIR  "run"
  49 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
  50 #else
  51 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
  52 #define QGA_STATE_RELATIVE_DIR  "qemu-ga"
  53 #define QGA_SERIAL_PATH_DEFAULT "COM1"
  54 #endif
  55 #ifdef CONFIG_FSFREEZE
  56 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
  57 #endif
  58 #define QGA_SENTINEL_BYTE 0xFF
  59 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
  60
  61 static struct {
  62     const char *state_dir;
  63     const char *pidfile;
  64 } dfl_pathnames;
  65
  66 typedef struct GAPersistentState {
  67 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
  68     int64_t fd_counter;
  69 } GAPersistentState;
  70
  71 struct GAState {
  72     JSONMessageParser parser;
  73     GMainLoop *main_loop;
  74     GAChannel *channel;
  75     bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
  76     GACommandState *command_state;
  77     GLogLevelFlags log_level;
  78     FILE *log_file;
  79     bool logging_enabled;
  80 #ifdef _WIN32
  81     GAService service;
  82 #endif
  83     bool delimit_response;
  84     bool frozen;
  85     GList *blacklist;
  86     char *state_filepath_isfrozen;
  87     struct {
  88         const char *log_filepath;
  89         const char *pid_filepath;
  90     } deferred_options;
  91 #ifdef CONFIG_FSFREEZE
  92     const char *fsfreeze_hook;
  93 #endif
  94     gchar *pstate_filepath;
  95     GAPersistentState pstate;
  96 };
  97
  98 struct GAState *ga_state;
  99
 100 /* commands that are safe to issue while filesystems are frozen */
 101 static const char *ga_freeze_whitelist[] = {
 102     "guest-ping",
 103     "guest-info",
 104     "guest-sync",
 105     "guest-sync-delimited",
 106     "guest-fsfreeze-status",
 107     "guest-fsfreeze-thaw",
 108     NULL
 109 };
 110
 111 #ifdef _WIN32
 112 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 113                                   LPVOID ctx);
 114 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
 115 #endif
 116
 117 static void
 118 init_dfl_pathnames(void)
 119 {
 120     g_assert(dfl_pathnames.state_dir == NULL);
 121     g_assert(dfl_pathnames.pidfile == NULL);
 122     dfl_pathnames.state_dir = qemu_get_local_state_pathname(
 123       QGA_STATE_RELATIVE_DIR);
 124     dfl_pathnames.pidfile   = qemu_get_local_state_pathname(
 125       QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
 126 }
 127
 128 static void quit_handler(int sig)
 129 {
 130     /* if we're frozen, don't exit unless we're absolutely forced to,
 131      * because it's basically impossible for graceful exit to complete
 132      * unless all log/pid files are on unfreezable filesystems. there's
 133      * also a very likely chance killing the agent before unfreezing
 134      * the filesystems is a mistake (or will be viewed as one later).
 135      */
 136     if (ga_is_frozen(ga_state)) {
 137         return;
 138     }
 139     g_debug("received signal num %d, quitting", sig);
 140
 141     if (g_main_loop_is_running(ga_state->main_loop)) {
 142         g_main_loop_quit(ga_state->main_loop);
 143     }
 144 }
 145
 146 #ifndef _WIN32
 147 static gboolean register_signal_handlers(void)
 148 {
 149     struct sigaction sigact;
 150     int ret;
 151
 152     memset(&sigact, 0, sizeof(struct sigaction));
 153     sigact.sa_handler = quit_handler;
 154
 155     ret = sigaction(SIGINT, &sigact, NULL);
 156     if (ret == -1) {
 157         g_error("error configuring signal handler: %s", strerror(errno));
 158     }
 159     ret = sigaction(SIGTERM, &sigact, NULL);
 160     if (ret == -1) {
 161         g_error("error configuring signal handler: %s", strerror(errno));
 162     }
 163
 164     sigact.sa_handler = SIG_IGN;
 165     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
 166         g_error("error configuring SIGPIPE signal handler: %s",
 167                 strerror(errno));
 168     }
 169
 170     return true;
 171 }
 172
 173 /* TODO: use this in place of all post-fork() fclose(std*) callers */
 174 void reopen_fd_to_null(int fd)
 175 {
 176     int nullfd;
 177
 178     nullfd = open("/dev/null", O_RDWR);
 179     if (nullfd < 0) {
 180         return;
 181     }
 182
 183     dup2(nullfd, fd);
 184
 185     if (nullfd != fd) {
 186         close(nullfd);
 187     }
 188 }
 189 #endif
 190
 191 static void usage(const char *cmd)
 192 {
 193     printf(
 194 "Usage: %s [-m <method> -p <path>] [<options>]\n"
 195 "QEMU Guest Agent %s\n"
 196 "\n"
 197 "  -m, --method      transport method: one of unix-listen, virtio-serial, or\n"
 198 "                    isa-serial (virtio-serial is the default)\n"
 199 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
 200 "                    %s,\n"
 201 "                    the default for isa-serial is:\n"
 202 "                    %s)\n"
 203 "  -l, --logfile     set logfile path, logs to stderr by default\n"
 204 "  -f, --pidfile     specify pidfile (default is %s)\n"
 205 #ifdef CONFIG_FSFREEZE
 206 "  -F, --fsfreeze-hook\n"
 207 "                    enable fsfreeze hook. Accepts an optional argument that\n"
 208 "                    specifies script to run on freeze/thaw. Script will be\n"
 209 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
 210 "                    (default is %s)\n"
 211 "                    If using -F with an argument, do not follow -F with a\n"
 212 "                    space.\n"
 213 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
 214 #endif
 215 "  -t, --statedir    specify dir to store state information (absolute paths\n"
 216 "                    only, default is %s)\n"
 217 "  -v, --verbose     log extra debugging information\n"
 218 "  -V, --version     print version information and exit\n"
 219 "  -d, --daemonize   become a daemon\n"
 220 #ifdef _WIN32
 221 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 222 #endif
 223 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
 224 "                    to list available RPCs)\n"
 225 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 226 "                    options / command-line parameters to stdout\n"
 227 "  -h, --help        display this help and exit\n"
 228 "\n"
 229 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
 230     , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
 231     dfl_pathnames.pidfile,
 232 #ifdef CONFIG_FSFREEZE
 233     QGA_FSFREEZE_HOOK_DEFAULT,
 234 #endif
 235     dfl_pathnames.state_dir);
 236 }
 237
 238 static const char *ga_log_level_str(GLogLevelFlags level)
 239 {
 240     switch (level & G_LOG_LEVEL_MASK) {
 241         case G_LOG_LEVEL_ERROR:
 242             return "error";
 243         case G_LOG_LEVEL_CRITICAL:
 244             return "critical";
 245         case G_LOG_LEVEL_WARNING:
 246             return "warning";
 247         case G_LOG_LEVEL_MESSAGE:
 248             return "message";
 249         case G_LOG_LEVEL_INFO:
 250             return "info";
 251         case G_LOG_LEVEL_DEBUG:
 252             return "debug";
 253         default:
 254             return "user";
 255     }
 256 }
 257
 258 bool ga_logging_enabled(GAState *s)
 259 {
 260     return s->logging_enabled;
 261 }
 262
 263 void ga_disable_logging(GAState *s)
 264 {
 265     s->logging_enabled = false;
 266 }
 267
 268 void ga_enable_logging(GAState *s)
 269 {
 270     s->logging_enabled = true;
 271 }
 272
 273 static void ga_log(const gchar *domain, GLogLevelFlags level,
 274                    const gchar *msg, gpointer opaque)
 275 {
 276     GAState *s = opaque;
 277     GTimeVal time;
 278     const char *level_str = ga_log_level_str(level);
 279
 280     if (!ga_logging_enabled(s)) {
 281         return;
 282     }
 283
 284     level &= G_LOG_LEVEL_MASK;
 285 #ifndef _WIN32
 286     if (g_strcmp0(domain, "syslog") == 0) {
 287         syslog(LOG_INFO, "%s: %s", level_str, msg);
 288     } else if (level & s->log_level) {
 289 #else
 290     if (level & s->log_level) {
 291 #endif
 292         g_get_current_time(&time);
 293         fprintf(s->log_file,
 294                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
 295         fflush(s->log_file);
 296     }
 297 }
 298
 299 void ga_set_response_delimited(GAState *s)
 300 {
 301     s->delimit_response = true;
 302 }
 303
 304 static FILE *ga_open_logfile(const char *logfile)
 305 {
 306     FILE *f;
 307
 308     f = fopen(logfile, "a");
 309     if (!f) {
 310         return NULL;
 311     }
 312
 313     qemu_set_cloexec(fileno(f));
 314     return f;
 315 }
 316
 317 #ifndef _WIN32
 318 static bool ga_open_pidfile(const char *pidfile)
 319 {
 320     int pidfd;
 321     char pidstr[32];
 322
 323     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
 324     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
 325         g_critical("Cannot lock pid file, %s", strerror(errno));
 326         if (pidfd != -1) {
 327             close(pidfd);
 328         }
 329         return false;
 330     }
 331
 332     if (ftruncate(pidfd, 0)) {
 333         g_critical("Failed to truncate pid file");
 334         goto fail;
 335     }
 336     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
 337     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
 338         g_critical("Failed to write pid file");
 339         goto fail;
 340     }
 341
 342     /* keep pidfile open & locked forever */
 343     return true;
 344
 345 fail:
 346     unlink(pidfile);
 347     close(pidfd);
 348     return false;
 349 }
 350 #else /* _WIN32 */
 351 static bool ga_open_pidfile(const char *pidfile)
 352 {
 353     return true;
 354 }
 355 #endif
 356
 357 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
 358 {
 359     return strcmp(str1, str2);
 360 }
 361
 362 /* disable commands that aren't safe for fsfreeze */
 363 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
 364 {
 365     bool whitelisted = false;
 366     int i = 0;
 367     const char *name = qmp_command_name(cmd);
 368
 369     while (ga_freeze_whitelist[i] != NULL) {
 370         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
 371             whitelisted = true;
 372         }
 373         i++;
 374     }
 375     if (!whitelisted) {
 376         g_debug("disabling command: %s", name);
 377         qmp_disable_command(name);
 378     }
 379 }
 380
 381 /* [re-]enable all commands, except those explicitly blacklisted by user */
 382 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
 383 {
 384     GList *blacklist = opaque;
 385     const char *name = qmp_command_name(cmd);
 386
 387     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
 388         !qmp_command_is_enabled(cmd)) {
 389         g_debug("enabling command: %s", name);
 390         qmp_enable_command(name);
 391     }
 392 }
 393
 394 static bool ga_create_file(const char *path)
 395 {
 396     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
 397     if (fd == -1) {
 398         g_warning("unable to open/create file %s: %s", path, strerror(errno));
 399         return false;
 400     }
 401     close(fd);
 402     return true;
 403 }
 404
 405 static bool ga_delete_file(const char *path)
 406 {
 407     int ret = unlink(path);
 408     if (ret == -1) {
 409         g_warning("unable to delete file: %s: %s", path, strerror(errno));
 410         return false;
 411     }
 412
 413     return true;
 414 }
 415
 416 bool ga_is_frozen(GAState *s)
 417 {
 418     return s->frozen;
 419 }
 420
 421 void ga_set_frozen(GAState *s)
 422 {
 423     if (ga_is_frozen(s)) {
 424         return;
 425     }
 426     /* disable all non-whitelisted (for frozen state) commands */
 427     qmp_for_each_command(ga_disable_non_whitelisted, NULL);
 428     g_warning("disabling logging due to filesystem freeze");
 429     ga_disable_logging(s);
 430     s->frozen = true;
 431     if (!ga_create_file(s->state_filepath_isfrozen)) {
 432         g_warning("unable to create %s, fsfreeze may not function properly",
 433                   s->state_filepath_isfrozen);
 434     }
 435 }
 436
 437 void ga_unset_frozen(GAState *s)
 438 {
 439     if (!ga_is_frozen(s)) {
 440         return;
 441     }
 442
 443     /* if we delayed creation/opening of pid/log files due to being
 444      * in a frozen state at start up, do it now
 445      */
 446     if (s->deferred_options.log_filepath) {
 447         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
 448         if (!s->log_file) {
 449             s->log_file = stderr;
 450         }
 451         s->deferred_options.log_filepath = NULL;
 452     }
 453     ga_enable_logging(s);
 454     g_warning("logging re-enabled due to filesystem unfreeze");
 455     if (s->deferred_options.pid_filepath) {
 456         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
 457             g_warning("failed to create/open pid file");
 458         }
 459         s->deferred_options.pid_filepath = NULL;
 460     }
 461
 462     /* enable all disabled, non-blacklisted commands */
 463     qmp_for_each_command(ga_enable_non_blacklisted, s->blacklist);
 464     s->frozen = false;
 465     if (!ga_delete_file(s->state_filepath_isfrozen)) {
 466         g_warning("unable to delete %s, fsfreeze may not function properly",
 467                   s->state_filepath_isfrozen);
 468     }
 469 }
 470
 471 #ifdef CONFIG_FSFREEZE
 472 const char *ga_fsfreeze_hook(GAState *s)
 473 {
 474     return s->fsfreeze_hook;
 475 }
 476 #endif
 477
 478 static void become_daemon(const char *pidfile)
 479 {
 480 #ifndef _WIN32
 481     pid_t pid, sid;
 482
 483     pid = fork();
 484     if (pid < 0) {
 485         exit(EXIT_FAILURE);
 486     }
 487     if (pid > 0) {
 488         exit(EXIT_SUCCESS);
 489     }
 490
 491     if (pidfile) {
 492         if (!ga_open_pidfile(pidfile)) {
 493             g_critical("failed to create pidfile");
 494             exit(EXIT_FAILURE);
 495         }
 496     }
 497
 498     umask(S_IRWXG | S_IRWXO);
 499     sid = setsid();
 500     if (sid < 0) {
 501         goto fail;
 502     }
 503     if ((chdir("/")) < 0) {
 504         goto fail;
 505     }
 506
 507     reopen_fd_to_null(STDIN_FILENO);
 508     reopen_fd_to_null(STDOUT_FILENO);
 509     reopen_fd_to_null(STDERR_FILENO);
 510     return;
 511
 512 fail:
 513     if (pidfile) {
 514         unlink(pidfile);
 515     }
 516     g_critical("failed to daemonize");
 517     exit(EXIT_FAILURE);
 518 #endif
 519 }
 520
 521 static int send_response(GAState *s, QObject *payload)
 522 {
 523     const char *buf;
 524     QString *payload_qstr, *response_qstr;
 525     GIOStatus status;
 526
 527     g_assert(payload && s->channel);
 528
 529     payload_qstr = qobject_to_json(payload);
 530     if (!payload_qstr) {
 531         return -EINVAL;
 532     }
 533
 534     if (s->delimit_response) {
 535         s->delimit_response = false;
 536         response_qstr = qstring_new();
 537         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
 538         qstring_append(response_qstr, qstring_get_str(payload_qstr));
 539         QDECREF(payload_qstr);
 540     } else {
 541         response_qstr = payload_qstr;
 542     }
 543
 544     qstring_append_chr(response_qstr, '\n');
 545     buf = qstring_get_str(response_qstr);
 546     status = ga_channel_write_all(s->channel, buf, strlen(buf));
 547     QDECREF(response_qstr);
 548     if (status != G_IO_STATUS_NORMAL) {
 549         return -EIO;
 550     }
 551
 552     return 0;
 553 }
 554
 555 static void process_command(GAState *s, QDict *req)
 556 {
 557     QObject *rsp = NULL;
 558     int ret;
 559
 560     g_assert(req);
 561     g_debug("processing command");
 562     rsp = qmp_dispatch(QOBJECT(req));
 563     if (rsp) {
 564         ret = send_response(s, rsp);
 565         if (ret) {
 566             g_warning("error sending response: %s", strerror(ret));
 567         }
 568         qobject_decref(rsp);
 569     }
 570 }
 571
 572 /* handle requests/control events coming in over the channel */
 573 static void process_event(JSONMessageParser *parser, QList *tokens)
 574 {
 575     GAState *s = container_of(parser, GAState, parser);
 576     QDict *qdict;
 577     Error *err = NULL;
 578     int ret;
 579
 580     g_assert(s && parser);
 581
 582     g_debug("process_event: called");
 583     qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
 584     if (err || !qdict) {
 585         QDECREF(qdict);
 586         qdict = qdict_new();
 587         if (!err) {
 588             g_warning("failed to parse event: unknown error");
 589             error_setg(&err, QERR_JSON_PARSING);
 590         } else {
 591             g_warning("failed to parse event: %s", error_get_pretty(err));
 592         }
 593         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 594         error_free(err);
 595     }
 596
 597     /* handle host->guest commands */
 598     if (qdict_haskey(qdict, "execute")) {
 599         process_command(s, qdict);
 600     } else {
 601         if (!qdict_haskey(qdict, "error")) {
 602             QDECREF(qdict);
 603             qdict = qdict_new();
 604             g_warning("unrecognized payload format");
 605             error_setg(&err, QERR_UNSUPPORTED);
 606             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 607             error_free(err);
 608         }
 609         ret = send_response(s, QOBJECT(qdict));
 610         if (ret < 0) {
 611             g_warning("error sending error response: %s", strerror(-ret));
 612         }
 613     }
 614
 615     QDECREF(qdict);
 616 }
 617
 618 /* false return signals GAChannel to close the current client connection */
 619 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
 620 {
 621     GAState *s = data;
 622     gchar buf[QGA_READ_COUNT_DEFAULT+1];
 623     gsize count;
 624     GError *err = NULL;
 625     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
 626     if (err != NULL) {
 627         g_warning("error reading channel: %s", err->message);
 628         g_error_free(err);
 629         return false;
 630     }
 631     switch (status) {
 632     case G_IO_STATUS_ERROR:
 633         g_warning("error reading channel");
 634         return false;
 635     case G_IO_STATUS_NORMAL:
 636         buf[count] = 0;
 637         g_debug("read data, count: %d, data: %s", (int)count, buf);
 638         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
 639         break;
 640     case G_IO_STATUS_EOF:
 641         g_debug("received EOF");
 642         if (!s->virtio) {
 643             return false;
 644         }
 645         /* fall through */
 646     case G_IO_STATUS_AGAIN:
 647         /* virtio causes us to spin here when no process is attached to
 648          * host-side chardev. sleep a bit to mitigate this
 649          */
 650         if (s->virtio) {
 651             usleep(100*1000);
 652         }
 653         return true;
 654     default:
 655         g_warning("unknown channel read status, closing");
 656         return false;
 657     }
 658     return true;
 659 }
 660
 661 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
 662 {
 663     GAChannelMethod channel_method;
 664
 665     if (strcmp(method, "virtio-serial") == 0) {
 666         s->virtio = true; /* virtio requires special handling in some cases */
 667         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
 668     } else if (strcmp(method, "isa-serial") == 0) {
 669         channel_method = GA_CHANNEL_ISA_SERIAL;
 670     } else if (strcmp(method, "unix-listen") == 0) {
 671         channel_method = GA_CHANNEL_UNIX_LISTEN;
 672     } else {
 673         g_critical("unsupported channel method/type: %s", method);
 674         return false;
 675     }
 676
 677     s->channel = ga_channel_new(channel_method, path, channel_event_cb, s);
 678     if (!s->channel) {
 679         g_critical("failed to create guest agent channel");
 680         return false;
 681     }
 682
 683     return true;
 684 }
 685
 686 #ifdef _WIN32
 687 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 688                                   LPVOID ctx)
 689 {
 690     DWORD ret = NO_ERROR;
 691     GAService *service = &ga_state->service;
 692
 693     switch (ctrl)
 694     {
 695         case SERVICE_CONTROL_STOP:
 696         case SERVICE_CONTROL_SHUTDOWN:
 697             quit_handler(SIGTERM);
 698             service->status.dwCurrentState = SERVICE_STOP_PENDING;
 699             SetServiceStatus(service->status_handle, &service->status);
 700             break;
 701
 702         default:
 703             ret = ERROR_CALL_NOT_IMPLEMENTED;
 704     }
 705     return ret;
 706 }
 707
 708 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
 709 {
 710     GAService *service = &ga_state->service;
 711
 712     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
 713         service_ctrl_handler, NULL);
 714
 715     if (service->status_handle == 0) {
 716         g_critical("Failed to register extended requests function!\n");
 717         return;
 718     }
 719
 720     service->status.dwServiceType = SERVICE_WIN32;
 721     service->status.dwCurrentState = SERVICE_RUNNING;
 722     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 723     service->status.dwWin32ExitCode = NO_ERROR;
 724     service->status.dwServiceSpecificExitCode = NO_ERROR;
 725     service->status.dwCheckPoint = 0;
 726     service->status.dwWaitHint = 0;
 727     SetServiceStatus(service->status_handle, &service->status);
 728
 729     g_main_loop_run(ga_state->main_loop);
 730
 731     service->status.dwCurrentState = SERVICE_STOPPED;
 732     SetServiceStatus(service->status_handle, &service->status);
 733 }
 734 #endif
 735
 736 static void set_persistent_state_defaults(GAPersistentState *pstate)
 737 {
 738     g_assert(pstate);
 739     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
 740 }
 741
 742 static void persistent_state_from_keyfile(GAPersistentState *pstate,
 743                                           GKeyFile *keyfile)
 744 {
 745     g_assert(pstate);
 746     g_assert(keyfile);
 747     /* if any fields are missing, either because the file was tampered with
 748      * by agents of chaos, or because the field wasn't present at the time the
 749      * file was created, the best we can ever do is start over with the default
 750      * values. so load them now, and ignore any errors in accessing key-value
 751      * pairs
 752      */
 753     set_persistent_state_defaults(pstate);
 754
 755     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
 756         pstate->fd_counter =
 757             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
 758     }
 759 }
 760
 761 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
 762                                         GKeyFile *keyfile)
 763 {
 764     g_assert(pstate);
 765     g_assert(keyfile);
 766
 767     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
 768 }
 769
 770 static gboolean write_persistent_state(const GAPersistentState *pstate,
 771                                        const gchar *path)
 772 {
 773     GKeyFile *keyfile = g_key_file_new();
 774     GError *gerr = NULL;
 775     gboolean ret = true;
 776     gchar *data = NULL;
 777     gsize data_len;
 778
 779     g_assert(pstate);
 780
 781     persistent_state_to_keyfile(pstate, keyfile);
 782     data = g_key_file_to_data(keyfile, &data_len, &gerr);
 783     if (gerr) {
 784         g_critical("failed to convert persistent state to string: %s",
 785                    gerr->message);
 786         ret = false;
 787         goto out;
 788     }
 789
 790     g_file_set_contents(path, data, data_len, &gerr);
 791     if (gerr) {
 792         g_critical("failed to write persistent state to %s: %s",
 793                     path, gerr->message);
 794         ret = false;
 795         goto out;
 796     }
 797
 798 out:
 799     if (gerr) {
 800         g_error_free(gerr);
 801     }
 802     if (keyfile) {
 803         g_key_file_free(keyfile);
 804     }
 805     g_free(data);
 806     return ret;
 807 }
 808
 809 static gboolean read_persistent_state(GAPersistentState *pstate,
 810                                       const gchar *path, gboolean frozen)
 811 {
 812     GKeyFile *keyfile = NULL;
 813     GError *gerr = NULL;
 814     struct stat st;
 815     gboolean ret = true;
 816
 817     g_assert(pstate);
 818
 819     if (stat(path, &st) == -1) {
 820         /* it's okay if state file doesn't exist, but any other error
 821          * indicates a permissions issue or some other misconfiguration
 822          * that we likely won't be able to recover from.
 823          */
 824         if (errno != ENOENT) {
 825             g_critical("unable to access state file at path %s: %s",
 826                        path, strerror(errno));
 827             ret = false;
 828             goto out;
 829         }
 830
 831         /* file doesn't exist. initialize state to default values and
 832          * attempt to save now. (we could wait till later when we have
 833          * modified state we need to commit, but if there's a problem,
 834          * such as a missing parent directory, we want to catch it now)
 835          *
 836          * there is a potential scenario where someone either managed to
 837          * update the agent from a version that didn't use a key store
 838          * while qemu-ga thought the filesystem was frozen, or
 839          * deleted the key store prior to issuing a fsfreeze, prior
 840          * to restarting the agent. in this case we go ahead and defer
 841          * initial creation till we actually have modified state to
 842          * write, otherwise fail to recover from freeze.
 843          */
 844         set_persistent_state_defaults(pstate);
 845         if (!frozen) {
 846             ret = write_persistent_state(pstate, path);
 847             if (!ret) {
 848                 g_critical("unable to create state file at path %s", path);
 849                 ret = false;
 850                 goto out;
 851             }
 852         }
 853         ret = true;
 854         goto out;
 855     }
 856
 857     keyfile = g_key_file_new();
 858     g_key_file_load_from_file(keyfile, path, 0, &gerr);
 859     if (gerr) {
 860         g_critical("error loading persistent state from path: %s, %s",
 861                    path, gerr->message);
 862         ret = false;
 863         goto out;
 864     }
 865
 866     persistent_state_from_keyfile(pstate, keyfile);
 867
 868 out:
 869     if (keyfile) {
 870         g_key_file_free(keyfile);
 871     }
 872     if (gerr) {
 873         g_error_free(gerr);
 874     }
 875
 876     return ret;
 877 }
 878
 879 int64_t ga_get_fd_handle(GAState *s, Error **errp)
 880 {
 881     int64_t handle;
 882
 883     g_assert(s->pstate_filepath);
 884     /* we blacklist commands and avoid operations that potentially require
 885      * writing to disk when we're in a frozen state. this includes opening
 886      * new files, so we should never get here in that situation
 887      */
 888     g_assert(!ga_is_frozen(s));
 889
 890     handle = s->pstate.fd_counter++;
 891
 892     /* This should never happen on a reasonable timeframe, as guest-file-open
 893      * would have to be issued 2^63 times */
 894     if (s->pstate.fd_counter == INT64_MAX) {
 895         abort();
 896     }
 897
 898     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
 899         error_setg(errp, "failed to commit persistent state to disk");
 900         return -1;
 901     }
 902
 903     return handle;
 904 }
 905
 906 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
 907 {
 908     printf("%s\n", qmp_command_name(cmd));
 909 }
 910
 911 static GList *split_list(const gchar *str, const gchar *delim)
 912 {
 913     GList *list = NULL;
 914     int i;
 915     gchar **strv;
 916
 917     strv = g_strsplit(str, delim, -1);
 918     for (i = 0; strv[i]; i++) {
 919         list = g_list_prepend(list, strv[i]);
 920     }
 921     g_free(strv);
 922
 923     return list;
 924 }
 925
 926 typedef struct GAConfig {
 927     char *channel_path;
 928     char *method;
 929     char *log_filepath;
 930     char *pid_filepath;
 931 #ifdef CONFIG_FSFREEZE
 932     char *fsfreeze_hook;
 933 #endif
 934     char *state_dir;
 935 #ifdef _WIN32
 936     const char *service;
 937 #endif
 938     gchar *bliststr; /* blacklist may point to this string */
 939     GList *blacklist;
 940     int daemonize;
 941     GLogLevelFlags log_level;
 942     int dumpconf;
 943 } GAConfig;
 944
 945 static void config_load(GAConfig *config)
 946 {
 947     GError *gerr = NULL;
 948     GKeyFile *keyfile;
 949     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
 950
 951     /* read system config */
 952     keyfile = g_key_file_new();
 953     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
 954         goto end;
 955     }
 956     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
 957         config->daemonize =
 958             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
 959     }
 960     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
 961         config->method =
 962             g_key_file_get_string(keyfile, "general", "method", &gerr);
 963     }
 964     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
 965         config->channel_path =
 966             g_key_file_get_string(keyfile, "general", "path", &gerr);
 967     }
 968     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
 969         config->log_filepath =
 970             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
 971     }
 972     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
 973         config->pid_filepath =
 974             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
 975     }
 976 #ifdef CONFIG_FSFREEZE
 977     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
 978         config->fsfreeze_hook =
 979             g_key_file_get_string(keyfile,
 980                                   "general", "fsfreeze-hook", &gerr);
 981     }
 982 #endif
 983     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
 984         config->state_dir =
 985             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
 986     }
 987     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
 988         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
 989         /* enable all log levels */
 990         config->log_level = G_LOG_LEVEL_MASK;
 991     }
 992     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
 993         config->bliststr =
 994             g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
 995         config->blacklist = g_list_concat(config->blacklist,
 996                                           split_list(config->bliststr, ","));
 997     }
 998
 999 end:
1000     g_key_file_free(keyfile);
1001     if (gerr &&
1002         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1003         g_critical("error loading configuration from path: %s, %s",
1004                    QGA_CONF_DEFAULT, gerr->message);
1005         exit(EXIT_FAILURE);
1006     }
1007     g_clear_error(&gerr);
1008 }
1009
1010 static gchar *list_join(GList *list, const gchar separator)
1011 {
1012     GString *str = g_string_new("");
1013
1014     while (list) {
1015         str = g_string_append(str, (gchar *)list->data);
1016         list = g_list_next(list);
1017         if (list) {
1018             str = g_string_append_c(str, separator);
1019         }
1020     }
1021
1022     return g_string_free(str, FALSE);
1023 }
1024
1025 static void config_dump(GAConfig *config)
1026 {
1027     GError *error = NULL;
1028     GKeyFile *keyfile;
1029     gchar *tmp;
1030
1031     keyfile = g_key_file_new();
1032     g_assert(keyfile);
1033
1034     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1035     g_key_file_set_string(keyfile, "general", "method", config->method);
1036     g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1037     if (config->log_filepath) {
1038         g_key_file_set_string(keyfile, "general", "logfile",
1039                               config->log_filepath);
1040     }
1041     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1042 #ifdef CONFIG_FSFREEZE
1043     if (config->fsfreeze_hook) {
1044         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1045                               config->fsfreeze_hook);
1046     }
1047 #endif
1048     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1049     g_key_file_set_boolean(keyfile, "general", "verbose",
1050                            config->log_level == G_LOG_LEVEL_MASK);
1051     tmp = list_join(config->blacklist, ',');
1052     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1053     g_free(tmp);
1054
1055     tmp = g_key_file_to_data(keyfile, NULL, &error);
1056     printf("%s", tmp);
1057
1058     g_free(tmp);
1059     g_key_file_free(keyfile);
1060 }
1061
1062 static void config_parse(GAConfig *config, int argc, char **argv)
1063 {
1064     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1065     int opt_ind = 0, ch;
1066     const struct option lopt[] = {
1067         { "help", 0, NULL, 'h' },
1068         { "version", 0, NULL, 'V' },
1069         { "dump-conf", 0, NULL, 'D' },
1070         { "logfile", 1, NULL, 'l' },
1071         { "pidfile", 1, NULL, 'f' },
1072 #ifdef CONFIG_FSFREEZE
1073         { "fsfreeze-hook", 2, NULL, 'F' },
1074 #endif
1075         { "verbose", 0, NULL, 'v' },
1076         { "method", 1, NULL, 'm' },
1077         { "path", 1, NULL, 'p' },
1078         { "daemonize", 0, NULL, 'd' },
1079         { "blacklist", 1, NULL, 'b' },
1080 #ifdef _WIN32
1081         { "service", 1, NULL, 's' },
1082 #endif
1083         { "statedir", 1, NULL, 't' },
1084         { NULL, 0, NULL, 0 }
1085     };
1086
1087     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1088         switch (ch) {
1089         case 'm':
1090             g_free(config->method);
1091             config->method = g_strdup(optarg);
1092             break;
1093         case 'p':
1094             g_free(config->channel_path);
1095             config->channel_path = g_strdup(optarg);
1096             break;
1097         case 'l':
1098             g_free(config->log_filepath);
1099             config->log_filepath = g_strdup(optarg);
1100             break;
1101         case 'f':
1102             g_free(config->pid_filepath);
1103             config->pid_filepath = g_strdup(optarg);
1104             break;
1105 #ifdef CONFIG_FSFREEZE
1106         case 'F':
1107             g_free(config->fsfreeze_hook);
1108             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1109             break;
1110 #endif
1111         case 't':
1112             g_free(config->state_dir);
1113             config->state_dir = g_strdup(optarg);
1114             break;
1115         case 'v':
1116             /* enable all log levels */
1117             config->log_level = G_LOG_LEVEL_MASK;
1118             break;
1119         case 'V':
1120             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1121             exit(EXIT_SUCCESS);
1122         case 'd':
1123             config->daemonize = 1;
1124             break;
1125         case 'D':
1126             config->dumpconf = 1;
1127             break;
1128         case 'b': {
1129             if (is_help_option(optarg)) {
1130                 qmp_for_each_command(ga_print_cmd, NULL);
1131                 exit(EXIT_SUCCESS);
1132             }
1133             config->blacklist = g_list_concat(config->blacklist,
1134                                              split_list(optarg, ","));
1135             break;
1136         }
1137 #ifdef _WIN32
1138         case 's':
1139             config->service = optarg;
1140             if (strcmp(config->service, "install") == 0) {
1141                 if (ga_install_vss_provider()) {
1142                     exit(EXIT_FAILURE);
1143                 }
1144                 if (ga_install_service(config->channel_path,
1145                                        config->log_filepath, config->state_dir)) {
1146                     exit(EXIT_FAILURE);
1147                 }
1148                 exit(EXIT_SUCCESS);
1149             } else if (strcmp(config->service, "uninstall") == 0) {
1150                 ga_uninstall_vss_provider();
1151                 exit(ga_uninstall_service());
1152             } else if (strcmp(config->service, "vss-install") == 0) {
1153                 if (ga_install_vss_provider()) {
1154                     exit(EXIT_FAILURE);
1155                 }
1156                 exit(EXIT_SUCCESS);
1157             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1158                 ga_uninstall_vss_provider();
1159                 exit(EXIT_SUCCESS);
1160             } else {
1161                 printf("Unknown service command.\n");
1162                 exit(EXIT_FAILURE);
1163             }
1164             break;
1165 #endif
1166         case 'h':
1167             usage(argv[0]);
1168             exit(EXIT_SUCCESS);
1169         case '?':
1170             g_print("Unknown option, try '%s --help' for more information.\n",
1171                     argv[0]);
1172             exit(EXIT_FAILURE);
1173         }
1174     }
1175 }
1176
1177 static void config_free(GAConfig *config)
1178 {
1179     g_free(config->method);
1180     g_free(config->log_filepath);
1181     g_free(config->pid_filepath);
1182     g_free(config->state_dir);
1183     g_free(config->channel_path);
1184     g_free(config->bliststr);
1185 #ifdef CONFIG_FSFREEZE
1186     g_free(config->fsfreeze_hook);
1187 #endif
1188     g_free(config);
1189 }
1190
1191 static bool check_is_frozen(GAState *s)
1192 {
1193 #ifndef _WIN32
1194     /* check if a previous instance of qemu-ga exited with filesystems' state
1195      * marked as frozen. this could be a stale value (a non-qemu-ga process
1196      * or reboot may have since unfrozen them), but better to require an
1197      * uneeded unfreeze than to risk hanging on start-up
1198      */
1199     struct stat st;
1200     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1201         /* it's okay if the file doesn't exist, but if we can't access for
1202          * some other reason, such as permissions, there's a configuration
1203          * that needs to be addressed. so just bail now before we get into
1204          * more trouble later
1205          */
1206         if (errno != ENOENT) {
1207             g_critical("unable to access state file at path %s: %s",
1208                        s->state_filepath_isfrozen, strerror(errno));
1209             return EXIT_FAILURE;
1210         }
1211     } else {
1212         g_warning("previous instance appears to have exited with frozen"
1213                   " filesystems. deferring logging/pidfile creation and"
1214                   " disabling non-fsfreeze-safe commands until"
1215                   " guest-fsfreeze-thaw is issued, or filesystems are"
1216                   " manually unfrozen and the file %s is removed",
1217                   s->state_filepath_isfrozen);
1218         return true;
1219     }
1220 #endif
1221     return false;
1222 }
1223
1224 static int run_agent(GAState *s, GAConfig *config)
1225 {
1226     ga_state = s;
1227
1228     g_log_set_default_handler(ga_log, s);
1229     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1230     ga_enable_logging(s);
1231
1232 #ifdef _WIN32
1233     /* On win32 the state directory is application specific (be it the default
1234      * or a user override). We got past the command line parsing; let's create
1235      * the directory (with any intermediate directories). If we run into an
1236      * error later on, we won't try to clean up the directory, it is considered
1237      * persistent.
1238      */
1239     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1240         g_critical("unable to create (an ancestor of) the state directory"
1241                    " '%s': %s", config->state_dir, strerror(errno));
1242         return EXIT_FAILURE;
1243     }
1244 #endif
1245
1246     if (ga_is_frozen(s)) {
1247         if (config->daemonize) {
1248             /* delay opening/locking of pidfile till filesystems are unfrozen */
1249             s->deferred_options.pid_filepath = config->pid_filepath;
1250             become_daemon(NULL);
1251         }
1252         if (config->log_filepath) {
1253             /* delay opening the log file till filesystems are unfrozen */
1254             s->deferred_options.log_filepath = config->log_filepath;
1255         }
1256         ga_disable_logging(s);
1257         qmp_for_each_command(ga_disable_non_whitelisted, NULL);
1258     } else {
1259         if (config->daemonize) {
1260             become_daemon(config->pid_filepath);
1261         }
1262         if (config->log_filepath) {
1263             FILE *log_file = ga_open_logfile(config->log_filepath);
1264             if (!log_file) {
1265                 g_critical("unable to open specified log file: %s",
1266                            strerror(errno));
1267                 return EXIT_FAILURE;
1268             }
1269             s->log_file = log_file;
1270         }
1271     }
1272
1273     /* load persistent state from disk */
1274     if (!read_persistent_state(&s->pstate,
1275                                s->pstate_filepath,
1276                                ga_is_frozen(s))) {
1277         g_critical("failed to load persistent state");
1278         return EXIT_FAILURE;
1279     }
1280
1281     config->blacklist = ga_command_blacklist_init(config->blacklist);
1282     if (config->blacklist) {
1283         GList *l = config->blacklist;
1284         s->blacklist = config->blacklist;
1285         do {
1286             g_debug("disabling command: %s", (char *)l->data);
1287             qmp_disable_command(l->data);
1288             l = g_list_next(l);
1289         } while (l);
1290     }
1291     s->command_state = ga_command_state_new();
1292     ga_command_state_init(s, s->command_state);
1293     ga_command_state_init_all(s->command_state);
1294     json_message_parser_init(&s->parser, process_event);
1295     ga_state = s;
1296 #ifndef _WIN32
1297     if (!register_signal_handlers()) {
1298         g_critical("failed to register signal handlers");
1299         return EXIT_FAILURE;
1300     }
1301 #endif
1302
1303     s->main_loop = g_main_loop_new(NULL, false);
1304     if (!channel_init(ga_state, config->method, config->channel_path)) {
1305         g_critical("failed to initialize guest agent channel");
1306         return EXIT_FAILURE;
1307     }
1308 #ifndef _WIN32
1309     g_main_loop_run(ga_state->main_loop);
1310 #else
1311     if (config->daemonize) {
1312         SERVICE_TABLE_ENTRY service_table[] = {
1313             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1314         StartServiceCtrlDispatcher(service_table);
1315     } else {
1316         g_main_loop_run(ga_state->main_loop);
1317     }
1318 #endif
1319
1320     return EXIT_SUCCESS;
1321 }
1322
1323 static void free_blacklist_entry(gpointer entry, gpointer unused)
1324 {
1325     g_free(entry);
1326 }
1327
1328 int main(int argc, char **argv)
1329 {
1330     int ret = EXIT_SUCCESS;
1331     GAState *s = g_new0(GAState, 1);
1332     GAConfig *config = g_new0(GAConfig, 1);
1333
1334     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1335
1336     module_call_init(MODULE_INIT_QAPI);
1337
1338     init_dfl_pathnames();
1339     config_load(config);
1340     config_parse(config, argc, argv);
1341
1342     if (config->pid_filepath == NULL) {
1343         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1344     }
1345
1346     if (config->state_dir == NULL) {
1347         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1348     }
1349
1350     if (config->method == NULL) {
1351         config->method = g_strdup("virtio-serial");
1352     }
1353
1354     if (config->channel_path == NULL) {
1355         if (strcmp(config->method, "virtio-serial") == 0) {
1356             /* try the default path for the virtio-serial port */
1357             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1358         } else if (strcmp(config->method, "isa-serial") == 0) {
1359             /* try the default path for the serial port - COM1 */
1360             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1361         } else {
1362             g_critical("must specify a path for this channel");
1363             ret = EXIT_FAILURE;
1364             goto end;
1365         }
1366     }
1367
1368     s->log_level = config->log_level;
1369     s->log_file = stderr;
1370 #ifdef CONFIG_FSFREEZE
1371     s->fsfreeze_hook = config->fsfreeze_hook;
1372 #endif
1373     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1374     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1375                                                  config->state_dir);
1376     s->frozen = check_is_frozen(s);
1377
1378     if (config->dumpconf) {
1379         config_dump(config);
1380         goto end;
1381     }
1382
1383     ret = run_agent(s, config);
1384
1385 end:
1386     if (s->command_state) {
1387         ga_command_state_cleanup_all(s->command_state);
1388     }
1389     if (s->channel) {
1390         ga_channel_free(s->channel);
1391     }
1392     g_list_foreach(config->blacklist, free_blacklist_entry, NULL);
1393     g_free(s->pstate_filepath);
1394     g_free(s->state_filepath_isfrozen);
1395
1396     if (config->daemonize) {
1397         unlink(config->pid_filepath);
1398     }
1399
1400     config_free(config);
1401
1402     return ret;
1403 }