qga/main.c

   1 /*
   2  * QEMU Guest Agent
   3  *
   4  * Copyright IBM Corp. 2011
   5  *
   6  * Authors:
   7  *  Adam Litke        <aglitke@linux.vnet.ibm.com>
   8  *  Michael Roth      <mdroth@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  */
  13 #include "qemu/osdep.h"
  14 #include <getopt.h>
  15 #include <glib/gstdio.h>
  16 #ifndef _WIN32
  17 #include <syslog.h>
  18 #include <sys/wait.h>
  19 #endif
  20 #include "qapi/qmp/json-streamer.h"
  21 #include "qapi/qmp/json-parser.h"
  22 #include "qapi/qmp/qint.h"
  23 #include "qapi/qmp/qjson.h"
  24 #include "qga/guest-agent-core.h"
  25 #include "qemu/module.h"
  26 #include "qapi/qmp/qerror.h"
  27 #include "qapi/qmp/dispatch.h"
  28 #include "qga/channel.h"
  29 #include "qemu/bswap.h"
  30 #include "qemu/help_option.h"
  31 #ifdef _WIN32
  32 #include "qga/service-win32.h"
  33 #include "qga/vss-win32.h"
  34 #endif
  35 #ifdef __linux__
  36 #include <linux/fs.h>
  37 #ifdef FIFREEZE
  38 #define CONFIG_FSFREEZE
  39 #endif
  40 #endif
  41
  42 #ifndef _WIN32
  43 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
  44 #define QGA_STATE_RELATIVE_DIR  "run"
  45 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
  46 #else
  47 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
  48 #define QGA_STATE_RELATIVE_DIR  "qemu-ga"
  49 #define QGA_SERIAL_PATH_DEFAULT "COM1"
  50 #endif
  51 #ifdef CONFIG_FSFREEZE
  52 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
  53 #endif
  54 #define QGA_SENTINEL_BYTE 0xFF
  55 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
  56
  57 static struct {
  58     const char *state_dir;
  59     const char *pidfile;
  60 } dfl_pathnames;
  61
  62 typedef struct GAPersistentState {
  63 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
  64     int64_t fd_counter;
  65 } GAPersistentState;
  66
  67 struct GAState {
  68     JSONMessageParser parser;
  69     GMainLoop *main_loop;
  70     GAChannel *channel;
  71     bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
  72     GACommandState *command_state;
  73     GLogLevelFlags log_level;
  74     FILE *log_file;
  75     bool logging_enabled;
  76 #ifdef _WIN32
  77     GAService service;
  78 #endif
  79     bool delimit_response;
  80     bool frozen;
  81     GList *blacklist;
  82     char *state_filepath_isfrozen;
  83     struct {
  84         const char *log_filepath;
  85         const char *pid_filepath;
  86     } deferred_options;
  87 #ifdef CONFIG_FSFREEZE
  88     const char *fsfreeze_hook;
  89 #endif
  90     gchar *pstate_filepath;
  91     GAPersistentState pstate;
  92 };
  93
  94 struct GAState *ga_state;
  95
  96 /* commands that are safe to issue while filesystems are frozen */
  97 static const char *ga_freeze_whitelist[] = {
  98     "guest-ping",
  99     "guest-info",
 100     "guest-sync",
 101     "guest-sync-delimited",
 102     "guest-fsfreeze-status",
 103     "guest-fsfreeze-thaw",
 104     NULL
 105 };
 106
 107 #ifdef _WIN32
 108 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 109                                   LPVOID ctx);
 110 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
 111 #endif
 112
 113 static void
 114 init_dfl_pathnames(void)
 115 {
 116     g_assert(dfl_pathnames.state_dir == NULL);
 117     g_assert(dfl_pathnames.pidfile == NULL);
 118     dfl_pathnames.state_dir = qemu_get_local_state_pathname(
 119       QGA_STATE_RELATIVE_DIR);
 120     dfl_pathnames.pidfile   = qemu_get_local_state_pathname(
 121       QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
 122 }
 123
 124 static void quit_handler(int sig)
 125 {
 126     /* if we're frozen, don't exit unless we're absolutely forced to,
 127      * because it's basically impossible for graceful exit to complete
 128      * unless all log/pid files are on unfreezable filesystems. there's
 129      * also a very likely chance killing the agent before unfreezing
 130      * the filesystems is a mistake (or will be viewed as one later).
 131      */
 132     if (ga_is_frozen(ga_state)) {
 133         return;
 134     }
 135     g_debug("received signal num %d, quitting", sig);
 136
 137     if (g_main_loop_is_running(ga_state->main_loop)) {
 138         g_main_loop_quit(ga_state->main_loop);
 139     }
 140 }
 141
 142 #ifndef _WIN32
 143 static gboolean register_signal_handlers(void)
 144 {
 145     struct sigaction sigact;
 146     int ret;
 147
 148     memset(&sigact, 0, sizeof(struct sigaction));
 149     sigact.sa_handler = quit_handler;
 150
 151     ret = sigaction(SIGINT, &sigact, NULL);
 152     if (ret == -1) {
 153         g_error("error configuring signal handler: %s", strerror(errno));
 154     }
 155     ret = sigaction(SIGTERM, &sigact, NULL);
 156     if (ret == -1) {
 157         g_error("error configuring signal handler: %s", strerror(errno));
 158     }
 159
 160     sigact.sa_handler = SIG_IGN;
 161     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
 162         g_error("error configuring SIGPIPE signal handler: %s",
 163                 strerror(errno));
 164     }
 165
 166     return true;
 167 }
 168
 169 /* TODO: use this in place of all post-fork() fclose(std*) callers */
 170 void reopen_fd_to_null(int fd)
 171 {
 172     int nullfd;
 173
 174     nullfd = open("/dev/null", O_RDWR);
 175     if (nullfd < 0) {
 176         return;
 177     }
 178
 179     dup2(nullfd, fd);
 180
 181     if (nullfd != fd) {
 182         close(nullfd);
 183     }
 184 }
 185 #endif
 186
 187 static void usage(const char *cmd)
 188 {
 189     printf(
 190 "Usage: %s [-m <method> -p <path>] [<options>]\n"
 191 "QEMU Guest Agent %s\n"
 192 "\n"
 193 "  -m, --method      transport method: one of unix-listen, virtio-serial,\n"
 194 "                    isa-serial, or vsock-listen (virtio-serial is the default)\n"
 195 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
 196 "                    %s,\n"
 197 "                    the default for isa-serial is:\n"
 198 "                    %s)\n"
 199 "  -l, --logfile     set logfile path, logs to stderr by default\n"
 200 "  -f, --pidfile     specify pidfile (default is %s)\n"
 201 #ifdef CONFIG_FSFREEZE
 202 "  -F, --fsfreeze-hook\n"
 203 "                    enable fsfreeze hook. Accepts an optional argument that\n"
 204 "                    specifies script to run on freeze/thaw. Script will be\n"
 205 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
 206 "                    (default is %s)\n"
 207 "                    If using -F with an argument, do not follow -F with a\n"
 208 "                    space.\n"
 209 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
 210 #endif
 211 "  -t, --statedir    specify dir to store state information (absolute paths\n"
 212 "                    only, default is %s)\n"
 213 "  -v, --verbose     log extra debugging information\n"
 214 "  -V, --version     print version information and exit\n"
 215 "  -d, --daemonize   become a daemon\n"
 216 #ifdef _WIN32
 217 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 218 #endif
 219 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
 220 "                    to list available RPCs)\n"
 221 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 222 "                    options / command-line parameters to stdout\n"
 223 "  -h, --help        display this help and exit\n"
 224 "\n"
 225 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
 226     , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
 227     dfl_pathnames.pidfile,
 228 #ifdef CONFIG_FSFREEZE
 229     QGA_FSFREEZE_HOOK_DEFAULT,
 230 #endif
 231     dfl_pathnames.state_dir);
 232 }
 233
 234 static const char *ga_log_level_str(GLogLevelFlags level)
 235 {
 236     switch (level & G_LOG_LEVEL_MASK) {
 237         case G_LOG_LEVEL_ERROR:
 238             return "error";
 239         case G_LOG_LEVEL_CRITICAL:
 240             return "critical";
 241         case G_LOG_LEVEL_WARNING:
 242             return "warning";
 243         case G_LOG_LEVEL_MESSAGE:
 244             return "message";
 245         case G_LOG_LEVEL_INFO:
 246             return "info";
 247         case G_LOG_LEVEL_DEBUG:
 248             return "debug";
 249         default:
 250             return "user";
 251     }
 252 }
 253
 254 bool ga_logging_enabled(GAState *s)
 255 {
 256     return s->logging_enabled;
 257 }
 258
 259 void ga_disable_logging(GAState *s)
 260 {
 261     s->logging_enabled = false;
 262 }
 263
 264 void ga_enable_logging(GAState *s)
 265 {
 266     s->logging_enabled = true;
 267 }
 268
 269 static void ga_log(const gchar *domain, GLogLevelFlags level,
 270                    const gchar *msg, gpointer opaque)
 271 {
 272     GAState *s = opaque;
 273     GTimeVal time;
 274     const char *level_str = ga_log_level_str(level);
 275
 276     if (!ga_logging_enabled(s)) {
 277         return;
 278     }
 279
 280     level &= G_LOG_LEVEL_MASK;
 281 #ifndef _WIN32
 282     if (g_strcmp0(domain, "syslog") == 0) {
 283         syslog(LOG_INFO, "%s: %s", level_str, msg);
 284     } else if (level & s->log_level) {
 285 #else
 286     if (level & s->log_level) {
 287 #endif
 288         g_get_current_time(&time);
 289         fprintf(s->log_file,
 290                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
 291         fflush(s->log_file);
 292     }
 293 }
 294
 295 void ga_set_response_delimited(GAState *s)
 296 {
 297     s->delimit_response = true;
 298 }
 299
 300 static FILE *ga_open_logfile(const char *logfile)
 301 {
 302     FILE *f;
 303
 304     f = fopen(logfile, "a");
 305     if (!f) {
 306         return NULL;
 307     }
 308
 309     qemu_set_cloexec(fileno(f));
 310     return f;
 311 }
 312
 313 #ifndef _WIN32
 314 static bool ga_open_pidfile(const char *pidfile)
 315 {
 316     int pidfd;
 317     char pidstr[32];
 318
 319     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
 320     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
 321         g_critical("Cannot lock pid file, %s", strerror(errno));
 322         if (pidfd != -1) {
 323             close(pidfd);
 324         }
 325         return false;
 326     }
 327
 328     if (ftruncate(pidfd, 0)) {
 329         g_critical("Failed to truncate pid file");
 330         goto fail;
 331     }
 332     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
 333     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
 334         g_critical("Failed to write pid file");
 335         goto fail;
 336     }
 337
 338     /* keep pidfile open & locked forever */
 339     return true;
 340
 341 fail:
 342     unlink(pidfile);
 343     close(pidfd);
 344     return false;
 345 }
 346 #else /* _WIN32 */
 347 static bool ga_open_pidfile(const char *pidfile)
 348 {
 349     return true;
 350 }
 351 #endif
 352
 353 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
 354 {
 355     return strcmp(str1, str2);
 356 }
 357
 358 /* disable commands that aren't safe for fsfreeze */
 359 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
 360 {
 361     bool whitelisted = false;
 362     int i = 0;
 363     const char *name = qmp_command_name(cmd);
 364
 365     while (ga_freeze_whitelist[i] != NULL) {
 366         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
 367             whitelisted = true;
 368         }
 369         i++;
 370     }
 371     if (!whitelisted) {
 372         g_debug("disabling command: %s", name);
 373         qmp_disable_command(name);
 374     }
 375 }
 376
 377 /* [re-]enable all commands, except those explicitly blacklisted by user */
 378 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
 379 {
 380     GList *blacklist = opaque;
 381     const char *name = qmp_command_name(cmd);
 382
 383     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
 384         !qmp_command_is_enabled(cmd)) {
 385         g_debug("enabling command: %s", name);
 386         qmp_enable_command(name);
 387     }
 388 }
 389
 390 static bool ga_create_file(const char *path)
 391 {
 392     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
 393     if (fd == -1) {
 394         g_warning("unable to open/create file %s: %s", path, strerror(errno));
 395         return false;
 396     }
 397     close(fd);
 398     return true;
 399 }
 400
 401 static bool ga_delete_file(const char *path)
 402 {
 403     int ret = unlink(path);
 404     if (ret == -1) {
 405         g_warning("unable to delete file: %s: %s", path, strerror(errno));
 406         return false;
 407     }
 408
 409     return true;
 410 }
 411
 412 bool ga_is_frozen(GAState *s)
 413 {
 414     return s->frozen;
 415 }
 416
 417 void ga_set_frozen(GAState *s)
 418 {
 419     if (ga_is_frozen(s)) {
 420         return;
 421     }
 422     /* disable all non-whitelisted (for frozen state) commands */
 423     qmp_for_each_command(ga_disable_non_whitelisted, NULL);
 424     g_warning("disabling logging due to filesystem freeze");
 425     ga_disable_logging(s);
 426     s->frozen = true;
 427     if (!ga_create_file(s->state_filepath_isfrozen)) {
 428         g_warning("unable to create %s, fsfreeze may not function properly",
 429                   s->state_filepath_isfrozen);
 430     }
 431 }
 432
 433 void ga_unset_frozen(GAState *s)
 434 {
 435     if (!ga_is_frozen(s)) {
 436         return;
 437     }
 438
 439     /* if we delayed creation/opening of pid/log files due to being
 440      * in a frozen state at start up, do it now
 441      */
 442     if (s->deferred_options.log_filepath) {
 443         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
 444         if (!s->log_file) {
 445             s->log_file = stderr;
 446         }
 447         s->deferred_options.log_filepath = NULL;
 448     }
 449     ga_enable_logging(s);
 450     g_warning("logging re-enabled due to filesystem unfreeze");
 451     if (s->deferred_options.pid_filepath) {
 452         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
 453             g_warning("failed to create/open pid file");
 454         }
 455         s->deferred_options.pid_filepath = NULL;
 456     }
 457
 458     /* enable all disabled, non-blacklisted commands */
 459     qmp_for_each_command(ga_enable_non_blacklisted, s->blacklist);
 460     s->frozen = false;
 461     if (!ga_delete_file(s->state_filepath_isfrozen)) {
 462         g_warning("unable to delete %s, fsfreeze may not function properly",
 463                   s->state_filepath_isfrozen);
 464     }
 465 }
 466
 467 #ifdef CONFIG_FSFREEZE
 468 const char *ga_fsfreeze_hook(GAState *s)
 469 {
 470     return s->fsfreeze_hook;
 471 }
 472 #endif
 473
 474 static void become_daemon(const char *pidfile)
 475 {
 476 #ifndef _WIN32
 477     pid_t pid, sid;
 478
 479     pid = fork();
 480     if (pid < 0) {
 481         exit(EXIT_FAILURE);
 482     }
 483     if (pid > 0) {
 484         exit(EXIT_SUCCESS);
 485     }
 486
 487     if (pidfile) {
 488         if (!ga_open_pidfile(pidfile)) {
 489             g_critical("failed to create pidfile");
 490             exit(EXIT_FAILURE);
 491         }
 492     }
 493
 494     umask(S_IRWXG | S_IRWXO);
 495     sid = setsid();
 496     if (sid < 0) {
 497         goto fail;
 498     }
 499     if ((chdir("/")) < 0) {
 500         goto fail;
 501     }
 502
 503     reopen_fd_to_null(STDIN_FILENO);
 504     reopen_fd_to_null(STDOUT_FILENO);
 505     reopen_fd_to_null(STDERR_FILENO);
 506     return;
 507
 508 fail:
 509     if (pidfile) {
 510         unlink(pidfile);
 511     }
 512     g_critical("failed to daemonize");
 513     exit(EXIT_FAILURE);
 514 #endif
 515 }
 516
 517 static int send_response(GAState *s, QObject *payload)
 518 {
 519     const char *buf;
 520     QString *payload_qstr, *response_qstr;
 521     GIOStatus status;
 522
 523     g_assert(payload && s->channel);
 524
 525     payload_qstr = qobject_to_json(payload);
 526     if (!payload_qstr) {
 527         return -EINVAL;
 528     }
 529
 530     if (s->delimit_response) {
 531         s->delimit_response = false;
 532         response_qstr = qstring_new();
 533         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
 534         qstring_append(response_qstr, qstring_get_str(payload_qstr));
 535         QDECREF(payload_qstr);
 536     } else {
 537         response_qstr = payload_qstr;
 538     }
 539
 540     qstring_append_chr(response_qstr, '\n');
 541     buf = qstring_get_str(response_qstr);
 542     status = ga_channel_write_all(s->channel, buf, strlen(buf));
 543     QDECREF(response_qstr);
 544     if (status != G_IO_STATUS_NORMAL) {
 545         return -EIO;
 546     }
 547
 548     return 0;
 549 }
 550
 551 static void process_command(GAState *s, QDict *req)
 552 {
 553     QObject *rsp = NULL;
 554     int ret;
 555
 556     g_assert(req);
 557     g_debug("processing command");
 558     rsp = qmp_dispatch(QOBJECT(req));
 559     if (rsp) {
 560         ret = send_response(s, rsp);
 561         if (ret < 0) {
 562             g_warning("error sending response: %s", strerror(-ret));
 563         }
 564         qobject_decref(rsp);
 565     }
 566 }
 567
 568 /* handle requests/control events coming in over the channel */
 569 static void process_event(JSONMessageParser *parser, GQueue *tokens)
 570 {
 571     GAState *s = container_of(parser, GAState, parser);
 572     QDict *qdict;
 573     Error *err = NULL;
 574     int ret;
 575
 576     g_assert(s && parser);
 577
 578     g_debug("process_event: called");
 579     qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
 580     if (err || !qdict) {
 581         QDECREF(qdict);
 582         qdict = qdict_new();
 583         if (!err) {
 584             g_warning("failed to parse event: unknown error");
 585             error_setg(&err, QERR_JSON_PARSING);
 586         } else {
 587             g_warning("failed to parse event: %s", error_get_pretty(err));
 588         }
 589         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 590         error_free(err);
 591     }
 592
 593     /* handle host->guest commands */
 594     if (qdict_haskey(qdict, "execute")) {
 595         process_command(s, qdict);
 596     } else {
 597         if (!qdict_haskey(qdict, "error")) {
 598             QDECREF(qdict);
 599             qdict = qdict_new();
 600             g_warning("unrecognized payload format");
 601             error_setg(&err, QERR_UNSUPPORTED);
 602             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 603             error_free(err);
 604         }
 605         ret = send_response(s, QOBJECT(qdict));
 606         if (ret < 0) {
 607             g_warning("error sending error response: %s", strerror(-ret));
 608         }
 609     }
 610
 611     QDECREF(qdict);
 612 }
 613
 614 /* false return signals GAChannel to close the current client connection */
 615 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
 616 {
 617     GAState *s = data;
 618     gchar buf[QGA_READ_COUNT_DEFAULT+1];
 619     gsize count;
 620     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
 621     switch (status) {
 622     case G_IO_STATUS_ERROR:
 623         g_warning("error reading channel");
 624         return false;
 625     case G_IO_STATUS_NORMAL:
 626         buf[count] = 0;
 627         g_debug("read data, count: %d, data: %s", (int)count, buf);
 628         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
 629         break;
 630     case G_IO_STATUS_EOF:
 631         g_debug("received EOF");
 632         if (!s->virtio) {
 633             return false;
 634         }
 635         /* fall through */
 636     case G_IO_STATUS_AGAIN:
 637         /* virtio causes us to spin here when no process is attached to
 638          * host-side chardev. sleep a bit to mitigate this
 639          */
 640         if (s->virtio) {
 641             usleep(100*1000);
 642         }
 643         return true;
 644     default:
 645         g_warning("unknown channel read status, closing");
 646         return false;
 647     }
 648     return true;
 649 }
 650
 651 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
 652 {
 653     GAChannelMethod channel_method;
 654
 655     if (strcmp(method, "virtio-serial") == 0) {
 656         s->virtio = true; /* virtio requires special handling in some cases */
 657         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
 658     } else if (strcmp(method, "isa-serial") == 0) {
 659         channel_method = GA_CHANNEL_ISA_SERIAL;
 660     } else if (strcmp(method, "unix-listen") == 0) {
 661         channel_method = GA_CHANNEL_UNIX_LISTEN;
 662     } else if (strcmp(method, "vsock-listen") == 0) {
 663         channel_method = GA_CHANNEL_VSOCK_LISTEN;
 664     } else {
 665         g_critical("unsupported channel method/type: %s", method);
 666         return false;
 667     }
 668
 669     s->channel = ga_channel_new(channel_method, path, channel_event_cb, s);
 670     if (!s->channel) {
 671         g_critical("failed to create guest agent channel");
 672         return false;
 673     }
 674
 675     return true;
 676 }
 677
 678 #ifdef _WIN32
 679 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 680                                   LPVOID ctx)
 681 {
 682     DWORD ret = NO_ERROR;
 683     GAService *service = &ga_state->service;
 684
 685     switch (ctrl)
 686     {
 687         case SERVICE_CONTROL_STOP:
 688         case SERVICE_CONTROL_SHUTDOWN:
 689             quit_handler(SIGTERM);
 690             service->status.dwCurrentState = SERVICE_STOP_PENDING;
 691             SetServiceStatus(service->status_handle, &service->status);
 692             break;
 693
 694         default:
 695             ret = ERROR_CALL_NOT_IMPLEMENTED;
 696     }
 697     return ret;
 698 }
 699
 700 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
 701 {
 702     GAService *service = &ga_state->service;
 703
 704     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
 705         service_ctrl_handler, NULL);
 706
 707     if (service->status_handle == 0) {
 708         g_critical("Failed to register extended requests function!\n");
 709         return;
 710     }
 711
 712     service->status.dwServiceType = SERVICE_WIN32;
 713     service->status.dwCurrentState = SERVICE_RUNNING;
 714     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 715     service->status.dwWin32ExitCode = NO_ERROR;
 716     service->status.dwServiceSpecificExitCode = NO_ERROR;
 717     service->status.dwCheckPoint = 0;
 718     service->status.dwWaitHint = 0;
 719     SetServiceStatus(service->status_handle, &service->status);
 720
 721     g_main_loop_run(ga_state->main_loop);
 722
 723     service->status.dwCurrentState = SERVICE_STOPPED;
 724     SetServiceStatus(service->status_handle, &service->status);
 725 }
 726 #endif
 727
 728 static void set_persistent_state_defaults(GAPersistentState *pstate)
 729 {
 730     g_assert(pstate);
 731     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
 732 }
 733
 734 static void persistent_state_from_keyfile(GAPersistentState *pstate,
 735                                           GKeyFile *keyfile)
 736 {
 737     g_assert(pstate);
 738     g_assert(keyfile);
 739     /* if any fields are missing, either because the file was tampered with
 740      * by agents of chaos, or because the field wasn't present at the time the
 741      * file was created, the best we can ever do is start over with the default
 742      * values. so load them now, and ignore any errors in accessing key-value
 743      * pairs
 744      */
 745     set_persistent_state_defaults(pstate);
 746
 747     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
 748         pstate->fd_counter =
 749             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
 750     }
 751 }
 752
 753 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
 754                                         GKeyFile *keyfile)
 755 {
 756     g_assert(pstate);
 757     g_assert(keyfile);
 758
 759     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
 760 }
 761
 762 static gboolean write_persistent_state(const GAPersistentState *pstate,
 763                                        const gchar *path)
 764 {
 765     GKeyFile *keyfile = g_key_file_new();
 766     GError *gerr = NULL;
 767     gboolean ret = true;
 768     gchar *data = NULL;
 769     gsize data_len;
 770
 771     g_assert(pstate);
 772
 773     persistent_state_to_keyfile(pstate, keyfile);
 774     data = g_key_file_to_data(keyfile, &data_len, &gerr);
 775     if (gerr) {
 776         g_critical("failed to convert persistent state to string: %s",
 777                    gerr->message);
 778         ret = false;
 779         goto out;
 780     }
 781
 782     g_file_set_contents(path, data, data_len, &gerr);
 783     if (gerr) {
 784         g_critical("failed to write persistent state to %s: %s",
 785                     path, gerr->message);
 786         ret = false;
 787         goto out;
 788     }
 789
 790 out:
 791     if (gerr) {
 792         g_error_free(gerr);
 793     }
 794     if (keyfile) {
 795         g_key_file_free(keyfile);
 796     }
 797     g_free(data);
 798     return ret;
 799 }
 800
 801 static gboolean read_persistent_state(GAPersistentState *pstate,
 802                                       const gchar *path, gboolean frozen)
 803 {
 804     GKeyFile *keyfile = NULL;
 805     GError *gerr = NULL;
 806     struct stat st;
 807     gboolean ret = true;
 808
 809     g_assert(pstate);
 810
 811     if (stat(path, &st) == -1) {
 812         /* it's okay if state file doesn't exist, but any other error
 813          * indicates a permissions issue or some other misconfiguration
 814          * that we likely won't be able to recover from.
 815          */
 816         if (errno != ENOENT) {
 817             g_critical("unable to access state file at path %s: %s",
 818                        path, strerror(errno));
 819             ret = false;
 820             goto out;
 821         }
 822
 823         /* file doesn't exist. initialize state to default values and
 824          * attempt to save now. (we could wait till later when we have
 825          * modified state we need to commit, but if there's a problem,
 826          * such as a missing parent directory, we want to catch it now)
 827          *
 828          * there is a potential scenario where someone either managed to
 829          * update the agent from a version that didn't use a key store
 830          * while qemu-ga thought the filesystem was frozen, or
 831          * deleted the key store prior to issuing a fsfreeze, prior
 832          * to restarting the agent. in this case we go ahead and defer
 833          * initial creation till we actually have modified state to
 834          * write, otherwise fail to recover from freeze.
 835          */
 836         set_persistent_state_defaults(pstate);
 837         if (!frozen) {
 838             ret = write_persistent_state(pstate, path);
 839             if (!ret) {
 840                 g_critical("unable to create state file at path %s", path);
 841                 ret = false;
 842                 goto out;
 843             }
 844         }
 845         ret = true;
 846         goto out;
 847     }
 848
 849     keyfile = g_key_file_new();
 850     g_key_file_load_from_file(keyfile, path, 0, &gerr);
 851     if (gerr) {
 852         g_critical("error loading persistent state from path: %s, %s",
 853                    path, gerr->message);
 854         ret = false;
 855         goto out;
 856     }
 857
 858     persistent_state_from_keyfile(pstate, keyfile);
 859
 860 out:
 861     if (keyfile) {
 862         g_key_file_free(keyfile);
 863     }
 864     if (gerr) {
 865         g_error_free(gerr);
 866     }
 867
 868     return ret;
 869 }
 870
 871 int64_t ga_get_fd_handle(GAState *s, Error **errp)
 872 {
 873     int64_t handle;
 874
 875     g_assert(s->pstate_filepath);
 876     /* we blacklist commands and avoid operations that potentially require
 877      * writing to disk when we're in a frozen state. this includes opening
 878      * new files, so we should never get here in that situation
 879      */
 880     g_assert(!ga_is_frozen(s));
 881
 882     handle = s->pstate.fd_counter++;
 883
 884     /* This should never happen on a reasonable timeframe, as guest-file-open
 885      * would have to be issued 2^63 times */
 886     if (s->pstate.fd_counter == INT64_MAX) {
 887         abort();
 888     }
 889
 890     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
 891         error_setg(errp, "failed to commit persistent state to disk");
 892         return -1;
 893     }
 894
 895     return handle;
 896 }
 897
 898 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
 899 {
 900     printf("%s\n", qmp_command_name(cmd));
 901 }
 902
 903 static GList *split_list(const gchar *str, const gchar *delim)
 904 {
 905     GList *list = NULL;
 906     int i;
 907     gchar **strv;
 908
 909     strv = g_strsplit(str, delim, -1);
 910     for (i = 0; strv[i]; i++) {
 911         list = g_list_prepend(list, strv[i]);
 912     }
 913     g_free(strv);
 914
 915     return list;
 916 }
 917
 918 typedef struct GAConfig {
 919     char *channel_path;
 920     char *method;
 921     char *log_filepath;
 922     char *pid_filepath;
 923 #ifdef CONFIG_FSFREEZE
 924     char *fsfreeze_hook;
 925 #endif
 926     char *state_dir;
 927 #ifdef _WIN32
 928     const char *service;
 929 #endif
 930     gchar *bliststr; /* blacklist may point to this string */
 931     GList *blacklist;
 932     int daemonize;
 933     GLogLevelFlags log_level;
 934     int dumpconf;
 935 } GAConfig;
 936
 937 static void config_load(GAConfig *config)
 938 {
 939     GError *gerr = NULL;
 940     GKeyFile *keyfile;
 941     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
 942
 943     /* read system config */
 944     keyfile = g_key_file_new();
 945     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
 946         goto end;
 947     }
 948     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
 949         config->daemonize =
 950             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
 951     }
 952     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
 953         config->method =
 954             g_key_file_get_string(keyfile, "general", "method", &gerr);
 955     }
 956     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
 957         config->channel_path =
 958             g_key_file_get_string(keyfile, "general", "path", &gerr);
 959     }
 960     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
 961         config->log_filepath =
 962             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
 963     }
 964     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
 965         config->pid_filepath =
 966             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
 967     }
 968 #ifdef CONFIG_FSFREEZE
 969     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
 970         config->fsfreeze_hook =
 971             g_key_file_get_string(keyfile,
 972                                   "general", "fsfreeze-hook", &gerr);
 973     }
 974 #endif
 975     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
 976         config->state_dir =
 977             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
 978     }
 979     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
 980         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
 981         /* enable all log levels */
 982         config->log_level = G_LOG_LEVEL_MASK;
 983     }
 984     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
 985         config->bliststr =
 986             g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
 987         config->blacklist = g_list_concat(config->blacklist,
 988                                           split_list(config->bliststr, ","));
 989     }
 990
 991 end:
 992     g_key_file_free(keyfile);
 993     if (gerr &&
 994         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
 995         g_critical("error loading configuration from path: %s, %s",
 996                    QGA_CONF_DEFAULT, gerr->message);
 997         exit(EXIT_FAILURE);
 998     }
 999     g_clear_error(&gerr);
1000 }
1001
1002 static gchar *list_join(GList *list, const gchar separator)
1003 {
1004     GString *str = g_string_new("");
1005
1006     while (list) {
1007         str = g_string_append(str, (gchar *)list->data);
1008         list = g_list_next(list);
1009         if (list) {
1010             str = g_string_append_c(str, separator);
1011         }
1012     }
1013
1014     return g_string_free(str, FALSE);
1015 }
1016
1017 static void config_dump(GAConfig *config)
1018 {
1019     GError *error = NULL;
1020     GKeyFile *keyfile;
1021     gchar *tmp;
1022
1023     keyfile = g_key_file_new();
1024     g_assert(keyfile);
1025
1026     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1027     g_key_file_set_string(keyfile, "general", "method", config->method);
1028     g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1029     if (config->log_filepath) {
1030         g_key_file_set_string(keyfile, "general", "logfile",
1031                               config->log_filepath);
1032     }
1033     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1034 #ifdef CONFIG_FSFREEZE
1035     if (config->fsfreeze_hook) {
1036         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1037                               config->fsfreeze_hook);
1038     }
1039 #endif
1040     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1041     g_key_file_set_boolean(keyfile, "general", "verbose",
1042                            config->log_level == G_LOG_LEVEL_MASK);
1043     tmp = list_join(config->blacklist, ',');
1044     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1045     g_free(tmp);
1046
1047     tmp = g_key_file_to_data(keyfile, NULL, &error);
1048     printf("%s", tmp);
1049
1050     g_free(tmp);
1051     g_key_file_free(keyfile);
1052 }
1053
1054 static void config_parse(GAConfig *config, int argc, char **argv)
1055 {
1056     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1057     int opt_ind = 0, ch;
1058     const struct option lopt[] = {
1059         { "help", 0, NULL, 'h' },
1060         { "version", 0, NULL, 'V' },
1061         { "dump-conf", 0, NULL, 'D' },
1062         { "logfile", 1, NULL, 'l' },
1063         { "pidfile", 1, NULL, 'f' },
1064 #ifdef CONFIG_FSFREEZE
1065         { "fsfreeze-hook", 2, NULL, 'F' },
1066 #endif
1067         { "verbose", 0, NULL, 'v' },
1068         { "method", 1, NULL, 'm' },
1069         { "path", 1, NULL, 'p' },
1070         { "daemonize", 0, NULL, 'd' },
1071         { "blacklist", 1, NULL, 'b' },
1072 #ifdef _WIN32
1073         { "service", 1, NULL, 's' },
1074 #endif
1075         { "statedir", 1, NULL, 't' },
1076         { NULL, 0, NULL, 0 }
1077     };
1078
1079     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1080         switch (ch) {
1081         case 'm':
1082             g_free(config->method);
1083             config->method = g_strdup(optarg);
1084             break;
1085         case 'p':
1086             g_free(config->channel_path);
1087             config->channel_path = g_strdup(optarg);
1088             break;
1089         case 'l':
1090             g_free(config->log_filepath);
1091             config->log_filepath = g_strdup(optarg);
1092             break;
1093         case 'f':
1094             g_free(config->pid_filepath);
1095             config->pid_filepath = g_strdup(optarg);
1096             break;
1097 #ifdef CONFIG_FSFREEZE
1098         case 'F':
1099             g_free(config->fsfreeze_hook);
1100             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1101             break;
1102 #endif
1103         case 't':
1104             g_free(config->state_dir);
1105             config->state_dir = g_strdup(optarg);
1106             break;
1107         case 'v':
1108             /* enable all log levels */
1109             config->log_level = G_LOG_LEVEL_MASK;
1110             break;
1111         case 'V':
1112             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1113             exit(EXIT_SUCCESS);
1114         case 'd':
1115             config->daemonize = 1;
1116             break;
1117         case 'D':
1118             config->dumpconf = 1;
1119             break;
1120         case 'b': {
1121             if (is_help_option(optarg)) {
1122                 qmp_for_each_command(ga_print_cmd, NULL);
1123                 exit(EXIT_SUCCESS);
1124             }
1125             config->blacklist = g_list_concat(config->blacklist,
1126                                              split_list(optarg, ","));
1127             break;
1128         }
1129 #ifdef _WIN32
1130         case 's':
1131             config->service = optarg;
1132             if (strcmp(config->service, "install") == 0) {
1133                 if (ga_install_vss_provider()) {
1134                     exit(EXIT_FAILURE);
1135                 }
1136                 if (ga_install_service(config->channel_path,
1137                                        config->log_filepath, config->state_dir)) {
1138                     exit(EXIT_FAILURE);
1139                 }
1140                 exit(EXIT_SUCCESS);
1141             } else if (strcmp(config->service, "uninstall") == 0) {
1142                 ga_uninstall_vss_provider();
1143                 exit(ga_uninstall_service());
1144             } else if (strcmp(config->service, "vss-install") == 0) {
1145                 if (ga_install_vss_provider()) {
1146                     exit(EXIT_FAILURE);
1147                 }
1148                 exit(EXIT_SUCCESS);
1149             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1150                 ga_uninstall_vss_provider();
1151                 exit(EXIT_SUCCESS);
1152             } else {
1153                 printf("Unknown service command.\n");
1154                 exit(EXIT_FAILURE);
1155             }
1156             break;
1157 #endif
1158         case 'h':
1159             usage(argv[0]);
1160             exit(EXIT_SUCCESS);
1161         case '?':
1162             g_print("Unknown option, try '%s --help' for more information.\n",
1163                     argv[0]);
1164             exit(EXIT_FAILURE);
1165         }
1166     }
1167 }
1168
1169 static void config_free(GAConfig *config)
1170 {
1171     g_free(config->method);
1172     g_free(config->log_filepath);
1173     g_free(config->pid_filepath);
1174     g_free(config->state_dir);
1175     g_free(config->channel_path);
1176     g_free(config->bliststr);
1177 #ifdef CONFIG_FSFREEZE
1178     g_free(config->fsfreeze_hook);
1179 #endif
1180     g_list_free_full(config->blacklist, g_free);
1181     g_free(config);
1182 }
1183
1184 static bool check_is_frozen(GAState *s)
1185 {
1186 #ifndef _WIN32
1187     /* check if a previous instance of qemu-ga exited with filesystems' state
1188      * marked as frozen. this could be a stale value (a non-qemu-ga process
1189      * or reboot may have since unfrozen them), but better to require an
1190      * uneeded unfreeze than to risk hanging on start-up
1191      */
1192     struct stat st;
1193     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1194         /* it's okay if the file doesn't exist, but if we can't access for
1195          * some other reason, such as permissions, there's a configuration
1196          * that needs to be addressed. so just bail now before we get into
1197          * more trouble later
1198          */
1199         if (errno != ENOENT) {
1200             g_critical("unable to access state file at path %s: %s",
1201                        s->state_filepath_isfrozen, strerror(errno));
1202             return EXIT_FAILURE;
1203         }
1204     } else {
1205         g_warning("previous instance appears to have exited with frozen"
1206                   " filesystems. deferring logging/pidfile creation and"
1207                   " disabling non-fsfreeze-safe commands until"
1208                   " guest-fsfreeze-thaw is issued, or filesystems are"
1209                   " manually unfrozen and the file %s is removed",
1210                   s->state_filepath_isfrozen);
1211         return true;
1212     }
1213 #endif
1214     return false;
1215 }
1216
1217 static int run_agent(GAState *s, GAConfig *config)
1218 {
1219     ga_state = s;
1220
1221     g_log_set_default_handler(ga_log, s);
1222     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1223     ga_enable_logging(s);
1224
1225 #ifdef _WIN32
1226     /* On win32 the state directory is application specific (be it the default
1227      * or a user override). We got past the command line parsing; let's create
1228      * the directory (with any intermediate directories). If we run into an
1229      * error later on, we won't try to clean up the directory, it is considered
1230      * persistent.
1231      */
1232     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1233         g_critical("unable to create (an ancestor of) the state directory"
1234                    " '%s': %s", config->state_dir, strerror(errno));
1235         return EXIT_FAILURE;
1236     }
1237 #endif
1238
1239     if (ga_is_frozen(s)) {
1240         if (config->daemonize) {
1241             /* delay opening/locking of pidfile till filesystems are unfrozen */
1242             s->deferred_options.pid_filepath = config->pid_filepath;
1243             become_daemon(NULL);
1244         }
1245         if (config->log_filepath) {
1246             /* delay opening the log file till filesystems are unfrozen */
1247             s->deferred_options.log_filepath = config->log_filepath;
1248         }
1249         ga_disable_logging(s);
1250         qmp_for_each_command(ga_disable_non_whitelisted, NULL);
1251     } else {
1252         if (config->daemonize) {
1253             become_daemon(config->pid_filepath);
1254         }
1255         if (config->log_filepath) {
1256             FILE *log_file = ga_open_logfile(config->log_filepath);
1257             if (!log_file) {
1258                 g_critical("unable to open specified log file: %s",
1259                            strerror(errno));
1260                 return EXIT_FAILURE;
1261             }
1262             s->log_file = log_file;
1263         }
1264     }
1265
1266     /* load persistent state from disk */
1267     if (!read_persistent_state(&s->pstate,
1268                                s->pstate_filepath,
1269                                ga_is_frozen(s))) {
1270         g_critical("failed to load persistent state");
1271         return EXIT_FAILURE;
1272     }
1273
1274     config->blacklist = ga_command_blacklist_init(config->blacklist);
1275     if (config->blacklist) {
1276         GList *l = config->blacklist;
1277         s->blacklist = config->blacklist;
1278         do {
1279             g_debug("disabling command: %s", (char *)l->data);
1280             qmp_disable_command(l->data);
1281             l = g_list_next(l);
1282         } while (l);
1283     }
1284     s->command_state = ga_command_state_new();
1285     ga_command_state_init(s, s->command_state);
1286     ga_command_state_init_all(s->command_state);
1287     json_message_parser_init(&s->parser, process_event);
1288     ga_state = s;
1289 #ifndef _WIN32
1290     if (!register_signal_handlers()) {
1291         g_critical("failed to register signal handlers");
1292         return EXIT_FAILURE;
1293     }
1294 #endif
1295
1296     s->main_loop = g_main_loop_new(NULL, false);
1297     if (!channel_init(ga_state, config->method, config->channel_path)) {
1298         g_critical("failed to initialize guest agent channel");
1299         return EXIT_FAILURE;
1300     }
1301 #ifndef _WIN32
1302     g_main_loop_run(ga_state->main_loop);
1303 #else
1304     if (config->daemonize) {
1305         SERVICE_TABLE_ENTRY service_table[] = {
1306             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1307         StartServiceCtrlDispatcher(service_table);
1308     } else {
1309         g_main_loop_run(ga_state->main_loop);
1310     }
1311 #endif
1312
1313     return EXIT_SUCCESS;
1314 }
1315
1316 int main(int argc, char **argv)
1317 {
1318     int ret = EXIT_SUCCESS;
1319     GAState *s = g_new0(GAState, 1);
1320     GAConfig *config = g_new0(GAConfig, 1);
1321
1322     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1323
1324     qmp_init_marshal();
1325
1326     init_dfl_pathnames();
1327     config_load(config);
1328     config_parse(config, argc, argv);
1329
1330     if (config->pid_filepath == NULL) {
1331         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1332     }
1333
1334     if (config->state_dir == NULL) {
1335         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1336     }
1337
1338     if (config->method == NULL) {
1339         config->method = g_strdup("virtio-serial");
1340     }
1341
1342     if (config->channel_path == NULL) {
1343         if (strcmp(config->method, "virtio-serial") == 0) {
1344             /* try the default path for the virtio-serial port */
1345             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1346         } else if (strcmp(config->method, "isa-serial") == 0) {
1347             /* try the default path for the serial port - COM1 */
1348             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1349         } else {
1350             g_critical("must specify a path for this channel");
1351             ret = EXIT_FAILURE;
1352             goto end;
1353         }
1354     }
1355
1356     s->log_level = config->log_level;
1357     s->log_file = stderr;
1358 #ifdef CONFIG_FSFREEZE
1359     s->fsfreeze_hook = config->fsfreeze_hook;
1360 #endif
1361     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1362     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1363                                                  config->state_dir);
1364     s->frozen = check_is_frozen(s);
1365
1366     if (config->dumpconf) {
1367         config_dump(config);
1368         goto end;
1369     }
1370
1371     ret = run_agent(s, config);
1372
1373 end:
1374     if (s->command_state) {
1375         ga_command_state_cleanup_all(s->command_state);
1376         ga_command_state_free(s->command_state);
1377         json_message_parser_destroy(&s->parser);
1378     }
1379     if (s->channel) {
1380         ga_channel_free(s->channel);
1381     }
1382     g_free(s->pstate_filepath);
1383     g_free(s->state_filepath_isfrozen);
1384
1385     if (config->daemonize) {
1386         unlink(config->pid_filepath);
1387     }
1388
1389     config_free(config);
1390     if (s->main_loop) {
1391         g_main_loop_unref(s->main_loop);
1392     }
1393     g_free(s);
1394
1395     return ret;
1396 }