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
  14 #include "qemu/osdep.h"
  15 #include <getopt.h>
  16 #include <glib/gstdio.h>
  17 #ifndef _WIN32
  18 #include <syslog.h>
  19 #include <sys/wait.h>
  20 #endif
  21 #include "qapi/qmp/json-streamer.h"
  22 #include "qapi/qmp/json-parser.h"
  23 #include "qapi/qmp/qdict.h"
  24 #include "qapi/qmp/qjson.h"
  25 #include "qapi/qmp/qstring.h"
  26 #include "qga/guest-agent-core.h"
  27 #include "qemu/module.h"
  28 #include "qga-qapi-commands.h"
  29 #include "qapi/qmp/qerror.h"
  30 #include "qapi/error.h"
  31 #include "qga/channel.h"
  32 #include "qemu/bswap.h"
  33 #include "qemu/help_option.h"
  34 #include "qemu/sockets.h"
  35 #include "qemu/systemd.h"
  36 #include "qemu-version.h"
  37 #ifdef _WIN32
  38 #include "qga/service-win32.h"
  39 #include "qga/vss-win32.h"
  40 #endif
  41 #ifdef __linux__
  42 #include <linux/fs.h>
  43 #ifdef FIFREEZE
  44 #define CONFIG_FSFREEZE
  45 #endif
  46 #endif
  47
  48 #ifndef _WIN32
  49 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
  50 #define QGA_STATE_RELATIVE_DIR  "run"
  51 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
  52 #else
  53 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
  54 #define QGA_STATE_RELATIVE_DIR  "qemu-ga"
  55 #define QGA_SERIAL_PATH_DEFAULT "COM1"
  56 #endif
  57 #ifdef CONFIG_FSFREEZE
  58 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
  59 #endif
  60 #define QGA_SENTINEL_BYTE 0xFF
  61 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
  62
  63 static struct {
  64     const char *state_dir;
  65     const char *pidfile;
  66 } dfl_pathnames;
  67
  68 typedef struct GAPersistentState {
  69 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
  70     int64_t fd_counter;
  71 } GAPersistentState;
  72
  73 struct GAState {
  74     JSONMessageParser parser;
  75     GMainLoop *main_loop;
  76     GAChannel *channel;
  77     bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
  78     GACommandState *command_state;
  79     GLogLevelFlags log_level;
  80     FILE *log_file;
  81     bool logging_enabled;
  82 #ifdef _WIN32
  83     GAService service;
  84 #endif
  85     bool delimit_response;
  86     bool frozen;
  87     GList *blacklist;
  88     char *state_filepath_isfrozen;
  89     struct {
  90         const char *log_filepath;
  91         const char *pid_filepath;
  92     } deferred_options;
  93 #ifdef CONFIG_FSFREEZE
  94     const char *fsfreeze_hook;
  95 #endif
  96     gchar *pstate_filepath;
  97     GAPersistentState pstate;
  98 };
  99
 100 struct GAState *ga_state;
 101 QmpCommandList ga_commands;
 102
 103 /* commands that are safe to issue while filesystems are frozen */
 104 static const char *ga_freeze_whitelist[] = {
 105     "guest-ping",
 106     "guest-info",
 107     "guest-sync",
 108     "guest-sync-delimited",
 109     "guest-fsfreeze-status",
 110     "guest-fsfreeze-thaw",
 111     NULL
 112 };
 113
 114 #ifdef _WIN32
 115 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 116                                   LPVOID ctx);
 117 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
 118 #endif
 119
 120 static void
 121 init_dfl_pathnames(void)
 122 {
 123     g_assert(dfl_pathnames.state_dir == NULL);
 124     g_assert(dfl_pathnames.pidfile == NULL);
 125     dfl_pathnames.state_dir = qemu_get_local_state_pathname(
 126       QGA_STATE_RELATIVE_DIR);
 127     dfl_pathnames.pidfile   = qemu_get_local_state_pathname(
 128       QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
 129 }
 130
 131 static void quit_handler(int sig)
 132 {
 133     /* if we're frozen, don't exit unless we're absolutely forced to,
 134      * because it's basically impossible for graceful exit to complete
 135      * unless all log/pid files are on unfreezable filesystems. there's
 136      * also a very likely chance killing the agent before unfreezing
 137      * the filesystems is a mistake (or will be viewed as one later).
 138      * On Windows the freeze interval is limited to 10 seconds, so
 139      * we should quit, but first we should wait for the timeout, thaw
 140      * the filesystem and quit.
 141      */
 142     if (ga_is_frozen(ga_state)) {
 143 #ifdef _WIN32
 144         int i = 0;
 145         Error *err = NULL;
 146         HANDLE hEventTimeout;
 147
 148         g_debug("Thawing filesystems before exiting");
 149
 150         hEventTimeout = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_TIMEOUT);
 151         if (hEventTimeout) {
 152             WaitForSingleObject(hEventTimeout, 0);
 153             CloseHandle(hEventTimeout);
 154         }
 155         qga_vss_fsfreeze(&i, false, &err);
 156         if (err) {
 157             g_debug("Error unfreezing filesystems prior to exiting: %s",
 158                 error_get_pretty(err));
 159             error_free(err);
 160         }
 161 #else
 162         return;
 163 #endif
 164     }
 165     g_debug("received signal num %d, quitting", sig);
 166
 167     if (g_main_loop_is_running(ga_state->main_loop)) {
 168         g_main_loop_quit(ga_state->main_loop);
 169     }
 170 }
 171
 172 #ifndef _WIN32
 173 static gboolean register_signal_handlers(void)
 174 {
 175     struct sigaction sigact;
 176     int ret;
 177
 178     memset(&sigact, 0, sizeof(struct sigaction));
 179     sigact.sa_handler = quit_handler;
 180
 181     ret = sigaction(SIGINT, &sigact, NULL);
 182     if (ret == -1) {
 183         g_error("error configuring signal handler: %s", strerror(errno));
 184     }
 185     ret = sigaction(SIGTERM, &sigact, NULL);
 186     if (ret == -1) {
 187         g_error("error configuring signal handler: %s", strerror(errno));
 188     }
 189
 190     sigact.sa_handler = SIG_IGN;
 191     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
 192         g_error("error configuring SIGPIPE signal handler: %s",
 193                 strerror(errno));
 194     }
 195
 196     return true;
 197 }
 198
 199 /* TODO: use this in place of all post-fork() fclose(std*) callers */
 200 void reopen_fd_to_null(int fd)
 201 {
 202     int nullfd;
 203
 204     nullfd = open("/dev/null", O_RDWR);
 205     if (nullfd < 0) {
 206         return;
 207     }
 208
 209     dup2(nullfd, fd);
 210
 211     if (nullfd != fd) {
 212         close(nullfd);
 213     }
 214 }
 215 #endif
 216
 217 static void usage(const char *cmd)
 218 {
 219     printf(
 220 "Usage: %s [-m <method> -p <path>] [<options>]\n"
 221 "QEMU Guest Agent " QEMU_FULL_VERSION "\n"
 222 QEMU_COPYRIGHT "\n"
 223 "\n"
 224 "  -m, --method      transport method: one of unix-listen, virtio-serial,\n"
 225 "                    isa-serial, or vsock-listen (virtio-serial is the default)\n"
 226 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
 227 "                    %s,\n"
 228 "                    the default for isa-serial is:\n"
 229 "                    %s)\n"
 230 "  -l, --logfile     set logfile path, logs to stderr by default\n"
 231 "  -f, --pidfile     specify pidfile (default is %s)\n"
 232 #ifdef CONFIG_FSFREEZE
 233 "  -F, --fsfreeze-hook\n"
 234 "                    enable fsfreeze hook. Accepts an optional argument that\n"
 235 "                    specifies script to run on freeze/thaw. Script will be\n"
 236 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
 237 "                    (default is %s)\n"
 238 "                    If using -F with an argument, do not follow -F with a\n"
 239 "                    space.\n"
 240 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
 241 #endif
 242 "  -t, --statedir    specify dir to store state information (absolute paths\n"
 243 "                    only, default is %s)\n"
 244 "  -v, --verbose     log extra debugging information\n"
 245 "  -V, --version     print version information and exit\n"
 246 "  -d, --daemonize   become a daemon\n"
 247 #ifdef _WIN32
 248 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 249 #endif
 250 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
 251 "                    to list available RPCs)\n"
 252 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 253 "                    options / command-line parameters to stdout\n"
 254 "  -h, --help        display this help and exit\n"
 255 "\n"
 256 QEMU_HELP_BOTTOM "\n"
 257     , cmd, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
 258     dfl_pathnames.pidfile,
 259 #ifdef CONFIG_FSFREEZE
 260     QGA_FSFREEZE_HOOK_DEFAULT,
 261 #endif
 262     dfl_pathnames.state_dir);
 263 }
 264
 265 static const char *ga_log_level_str(GLogLevelFlags level)
 266 {
 267     switch (level & G_LOG_LEVEL_MASK) {
 268         case G_LOG_LEVEL_ERROR:
 269             return "error";
 270         case G_LOG_LEVEL_CRITICAL:
 271             return "critical";
 272         case G_LOG_LEVEL_WARNING:
 273             return "warning";
 274         case G_LOG_LEVEL_MESSAGE:
 275             return "message";
 276         case G_LOG_LEVEL_INFO:
 277             return "info";
 278         case G_LOG_LEVEL_DEBUG:
 279             return "debug";
 280         default:
 281             return "user";
 282     }
 283 }
 284
 285 bool ga_logging_enabled(GAState *s)
 286 {
 287     return s->logging_enabled;
 288 }
 289
 290 void ga_disable_logging(GAState *s)
 291 {
 292     s->logging_enabled = false;
 293 }
 294
 295 void ga_enable_logging(GAState *s)
 296 {
 297     s->logging_enabled = true;
 298 }
 299
 300 static void ga_log(const gchar *domain, GLogLevelFlags level,
 301                    const gchar *msg, gpointer opaque)
 302 {
 303     GAState *s = opaque;
 304     GTimeVal time;
 305     const char *level_str = ga_log_level_str(level);
 306
 307     if (!ga_logging_enabled(s)) {
 308         return;
 309     }
 310
 311     level &= G_LOG_LEVEL_MASK;
 312 #ifndef _WIN32
 313     if (g_strcmp0(domain, "syslog") == 0) {
 314         syslog(LOG_INFO, "%s: %s", level_str, msg);
 315     } else if (level & s->log_level) {
 316 #else
 317     if (level & s->log_level) {
 318 #endif
 319         g_get_current_time(&time);
 320         fprintf(s->log_file,
 321                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
 322         fflush(s->log_file);
 323     }
 324 }
 325
 326 void ga_set_response_delimited(GAState *s)
 327 {
 328     s->delimit_response = true;
 329 }
 330
 331 static FILE *ga_open_logfile(const char *logfile)
 332 {
 333     FILE *f;
 334
 335     f = fopen(logfile, "a");
 336     if (!f) {
 337         return NULL;
 338     }
 339
 340     qemu_set_cloexec(fileno(f));
 341     return f;
 342 }
 343
 344 #ifndef _WIN32
 345 static bool ga_open_pidfile(const char *pidfile)
 346 {
 347     int pidfd;
 348     char pidstr[32];
 349
 350     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
 351     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
 352         g_critical("Cannot lock pid file, %s", strerror(errno));
 353         if (pidfd != -1) {
 354             close(pidfd);
 355         }
 356         return false;
 357     }
 358
 359     if (ftruncate(pidfd, 0)) {
 360         g_critical("Failed to truncate pid file");
 361         goto fail;
 362     }
 363     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
 364     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
 365         g_critical("Failed to write pid file");
 366         goto fail;
 367     }
 368
 369     /* keep pidfile open & locked forever */
 370     return true;
 371
 372 fail:
 373     unlink(pidfile);
 374     close(pidfd);
 375     return false;
 376 }
 377 #else /* _WIN32 */
 378 static bool ga_open_pidfile(const char *pidfile)
 379 {
 380     return true;
 381 }
 382 #endif
 383
 384 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
 385 {
 386     return strcmp(str1, str2);
 387 }
 388
 389 /* disable commands that aren't safe for fsfreeze */
 390 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
 391 {
 392     bool whitelisted = false;
 393     int i = 0;
 394     const char *name = qmp_command_name(cmd);
 395
 396     while (ga_freeze_whitelist[i] != NULL) {
 397         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
 398             whitelisted = true;
 399         }
 400         i++;
 401     }
 402     if (!whitelisted) {
 403         g_debug("disabling command: %s", name);
 404         qmp_disable_command(&ga_commands, name);
 405     }
 406 }
 407
 408 /* [re-]enable all commands, except those explicitly blacklisted by user */
 409 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
 410 {
 411     GList *blacklist = opaque;
 412     const char *name = qmp_command_name(cmd);
 413
 414     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
 415         !qmp_command_is_enabled(cmd)) {
 416         g_debug("enabling command: %s", name);
 417         qmp_enable_command(&ga_commands, name);
 418     }
 419 }
 420
 421 static bool ga_create_file(const char *path)
 422 {
 423     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
 424     if (fd == -1) {
 425         g_warning("unable to open/create file %s: %s", path, strerror(errno));
 426         return false;
 427     }
 428     close(fd);
 429     return true;
 430 }
 431
 432 static bool ga_delete_file(const char *path)
 433 {
 434     int ret = unlink(path);
 435     if (ret == -1) {
 436         g_warning("unable to delete file: %s: %s", path, strerror(errno));
 437         return false;
 438     }
 439
 440     return true;
 441 }
 442
 443 bool ga_is_frozen(GAState *s)
 444 {
 445     return s->frozen;
 446 }
 447
 448 void ga_set_frozen(GAState *s)
 449 {
 450     if (ga_is_frozen(s)) {
 451         return;
 452     }
 453     /* disable all non-whitelisted (for frozen state) commands */
 454     qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
 455     g_warning("disabling logging due to filesystem freeze");
 456     ga_disable_logging(s);
 457     s->frozen = true;
 458     if (!ga_create_file(s->state_filepath_isfrozen)) {
 459         g_warning("unable to create %s, fsfreeze may not function properly",
 460                   s->state_filepath_isfrozen);
 461     }
 462 }
 463
 464 void ga_unset_frozen(GAState *s)
 465 {
 466     if (!ga_is_frozen(s)) {
 467         return;
 468     }
 469
 470     /* if we delayed creation/opening of pid/log files due to being
 471      * in a frozen state at start up, do it now
 472      */
 473     if (s->deferred_options.log_filepath) {
 474         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
 475         if (!s->log_file) {
 476             s->log_file = stderr;
 477         }
 478         s->deferred_options.log_filepath = NULL;
 479     }
 480     ga_enable_logging(s);
 481     g_warning("logging re-enabled due to filesystem unfreeze");
 482     if (s->deferred_options.pid_filepath) {
 483         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
 484             g_warning("failed to create/open pid file");
 485         }
 486         s->deferred_options.pid_filepath = NULL;
 487     }
 488
 489     /* enable all disabled, non-blacklisted commands */
 490     qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
 491     s->frozen = false;
 492     if (!ga_delete_file(s->state_filepath_isfrozen)) {
 493         g_warning("unable to delete %s, fsfreeze may not function properly",
 494                   s->state_filepath_isfrozen);
 495     }
 496 }
 497
 498 #ifdef CONFIG_FSFREEZE
 499 const char *ga_fsfreeze_hook(GAState *s)
 500 {
 501     return s->fsfreeze_hook;
 502 }
 503 #endif
 504
 505 static void become_daemon(const char *pidfile)
 506 {
 507 #ifndef _WIN32
 508     pid_t pid, sid;
 509
 510     pid = fork();
 511     if (pid < 0) {
 512         exit(EXIT_FAILURE);
 513     }
 514     if (pid > 0) {
 515         exit(EXIT_SUCCESS);
 516     }
 517
 518     if (pidfile) {
 519         if (!ga_open_pidfile(pidfile)) {
 520             g_critical("failed to create pidfile");
 521             exit(EXIT_FAILURE);
 522         }
 523     }
 524
 525     umask(S_IRWXG | S_IRWXO);
 526     sid = setsid();
 527     if (sid < 0) {
 528         goto fail;
 529     }
 530     if ((chdir("/")) < 0) {
 531         goto fail;
 532     }
 533
 534     reopen_fd_to_null(STDIN_FILENO);
 535     reopen_fd_to_null(STDOUT_FILENO);
 536     reopen_fd_to_null(STDERR_FILENO);
 537     return;
 538
 539 fail:
 540     if (pidfile) {
 541         unlink(pidfile);
 542     }
 543     g_critical("failed to daemonize");
 544     exit(EXIT_FAILURE);
 545 #endif
 546 }
 547
 548 static int send_response(GAState *s, QObject *payload)
 549 {
 550     const char *buf;
 551     QString *payload_qstr, *response_qstr;
 552     GIOStatus status;
 553
 554     g_assert(payload && s->channel);
 555
 556     payload_qstr = qobject_to_json(payload);
 557     if (!payload_qstr) {
 558         return -EINVAL;
 559     }
 560
 561     if (s->delimit_response) {
 562         s->delimit_response = false;
 563         response_qstr = qstring_new();
 564         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
 565         qstring_append(response_qstr, qstring_get_str(payload_qstr));
 566         QDECREF(payload_qstr);
 567     } else {
 568         response_qstr = payload_qstr;
 569     }
 570
 571     qstring_append_chr(response_qstr, '\n');
 572     buf = qstring_get_str(response_qstr);
 573     status = ga_channel_write_all(s->channel, buf, strlen(buf));
 574     QDECREF(response_qstr);
 575     if (status != G_IO_STATUS_NORMAL) {
 576         return -EIO;
 577     }
 578
 579     return 0;
 580 }
 581
 582 static void process_command(GAState *s, QDict *req)
 583 {
 584     QObject *rsp = NULL;
 585     int ret;
 586
 587     g_assert(req);
 588     g_debug("processing command");
 589     rsp = qmp_dispatch(&ga_commands, QOBJECT(req));
 590     if (rsp) {
 591         ret = send_response(s, rsp);
 592         if (ret < 0) {
 593             g_warning("error sending response: %s", strerror(-ret));
 594         }
 595         qobject_decref(rsp);
 596     }
 597 }
 598
 599 /* handle requests/control events coming in over the channel */
 600 static void process_event(JSONMessageParser *parser, GQueue *tokens)
 601 {
 602     GAState *s = container_of(parser, GAState, parser);
 603     QDict *qdict;
 604     Error *err = NULL;
 605     int ret;
 606
 607     g_assert(s && parser);
 608
 609     g_debug("process_event: called");
 610     qdict = qobject_to(QDict, json_parser_parse_err(tokens, NULL, &err));
 611     if (err || !qdict) {
 612         QDECREF(qdict);
 613         qdict = qdict_new();
 614         if (!err) {
 615             g_warning("failed to parse event: unknown error");
 616             error_setg(&err, QERR_JSON_PARSING);
 617         } else {
 618             g_warning("failed to parse event: %s", error_get_pretty(err));
 619         }
 620         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 621         error_free(err);
 622     }
 623
 624     /* handle host->guest commands */
 625     if (qdict_haskey(qdict, "execute")) {
 626         process_command(s, qdict);
 627     } else {
 628         if (!qdict_haskey(qdict, "error")) {
 629             QDECREF(qdict);
 630             qdict = qdict_new();
 631             g_warning("unrecognized payload format");
 632             error_setg(&err, QERR_UNSUPPORTED);
 633             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 634             error_free(err);
 635         }
 636         ret = send_response(s, QOBJECT(qdict));
 637         if (ret < 0) {
 638             g_warning("error sending error response: %s", strerror(-ret));
 639         }
 640     }
 641
 642     QDECREF(qdict);
 643 }
 644
 645 /* false return signals GAChannel to close the current client connection */
 646 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
 647 {
 648     GAState *s = data;
 649     gchar buf[QGA_READ_COUNT_DEFAULT+1];
 650     gsize count;
 651     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
 652     switch (status) {
 653     case G_IO_STATUS_ERROR:
 654         g_warning("error reading channel");
 655         return false;
 656     case G_IO_STATUS_NORMAL:
 657         buf[count] = 0;
 658         g_debug("read data, count: %d, data: %s", (int)count, buf);
 659         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
 660         break;
 661     case G_IO_STATUS_EOF:
 662         g_debug("received EOF");
 663         if (!s->virtio) {
 664             return false;
 665         }
 666         /* fall through */
 667     case G_IO_STATUS_AGAIN:
 668         /* virtio causes us to spin here when no process is attached to
 669          * host-side chardev. sleep a bit to mitigate this
 670          */
 671         if (s->virtio) {
 672             usleep(100*1000);
 673         }
 674         return true;
 675     default:
 676         g_warning("unknown channel read status, closing");
 677         return false;
 678     }
 679     return true;
 680 }
 681
 682 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
 683                              int listen_fd)
 684 {
 685     GAChannelMethod channel_method;
 686
 687     if (strcmp(method, "virtio-serial") == 0) {
 688         s->virtio = true; /* virtio requires special handling in some cases */
 689         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
 690     } else if (strcmp(method, "isa-serial") == 0) {
 691         channel_method = GA_CHANNEL_ISA_SERIAL;
 692     } else if (strcmp(method, "unix-listen") == 0) {
 693         channel_method = GA_CHANNEL_UNIX_LISTEN;
 694     } else if (strcmp(method, "vsock-listen") == 0) {
 695         channel_method = GA_CHANNEL_VSOCK_LISTEN;
 696     } else {
 697         g_critical("unsupported channel method/type: %s", method);
 698         return false;
 699     }
 700
 701     s->channel = ga_channel_new(channel_method, path, listen_fd,
 702                                 channel_event_cb, s);
 703     if (!s->channel) {
 704         g_critical("failed to create guest agent channel");
 705         return false;
 706     }
 707
 708     return true;
 709 }
 710
 711 #ifdef _WIN32
 712 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 713                                   LPVOID ctx)
 714 {
 715     DWORD ret = NO_ERROR;
 716     GAService *service = &ga_state->service;
 717
 718     switch (ctrl)
 719     {
 720         case SERVICE_CONTROL_STOP:
 721         case SERVICE_CONTROL_SHUTDOWN:
 722             quit_handler(SIGTERM);
 723             service->status.dwCurrentState = SERVICE_STOP_PENDING;
 724             SetServiceStatus(service->status_handle, &service->status);
 725             break;
 726
 727         default:
 728             ret = ERROR_CALL_NOT_IMPLEMENTED;
 729     }
 730     return ret;
 731 }
 732
 733 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
 734 {
 735     GAService *service = &ga_state->service;
 736
 737     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
 738         service_ctrl_handler, NULL);
 739
 740     if (service->status_handle == 0) {
 741         g_critical("Failed to register extended requests function!\n");
 742         return;
 743     }
 744
 745     service->status.dwServiceType = SERVICE_WIN32;
 746     service->status.dwCurrentState = SERVICE_RUNNING;
 747     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 748     service->status.dwWin32ExitCode = NO_ERROR;
 749     service->status.dwServiceSpecificExitCode = NO_ERROR;
 750     service->status.dwCheckPoint = 0;
 751     service->status.dwWaitHint = 0;
 752     SetServiceStatus(service->status_handle, &service->status);
 753
 754     g_main_loop_run(ga_state->main_loop);
 755
 756     service->status.dwCurrentState = SERVICE_STOPPED;
 757     SetServiceStatus(service->status_handle, &service->status);
 758 }
 759 #endif
 760
 761 static void set_persistent_state_defaults(GAPersistentState *pstate)
 762 {
 763     g_assert(pstate);
 764     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
 765 }
 766
 767 static void persistent_state_from_keyfile(GAPersistentState *pstate,
 768                                           GKeyFile *keyfile)
 769 {
 770     g_assert(pstate);
 771     g_assert(keyfile);
 772     /* if any fields are missing, either because the file was tampered with
 773      * by agents of chaos, or because the field wasn't present at the time the
 774      * file was created, the best we can ever do is start over with the default
 775      * values. so load them now, and ignore any errors in accessing key-value
 776      * pairs
 777      */
 778     set_persistent_state_defaults(pstate);
 779
 780     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
 781         pstate->fd_counter =
 782             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
 783     }
 784 }
 785
 786 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
 787                                         GKeyFile *keyfile)
 788 {
 789     g_assert(pstate);
 790     g_assert(keyfile);
 791
 792     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
 793 }
 794
 795 static gboolean write_persistent_state(const GAPersistentState *pstate,
 796                                        const gchar *path)
 797 {
 798     GKeyFile *keyfile = g_key_file_new();
 799     GError *gerr = NULL;
 800     gboolean ret = true;
 801     gchar *data = NULL;
 802     gsize data_len;
 803
 804     g_assert(pstate);
 805
 806     persistent_state_to_keyfile(pstate, keyfile);
 807     data = g_key_file_to_data(keyfile, &data_len, &gerr);
 808     if (gerr) {
 809         g_critical("failed to convert persistent state to string: %s",
 810                    gerr->message);
 811         ret = false;
 812         goto out;
 813     }
 814
 815     g_file_set_contents(path, data, data_len, &gerr);
 816     if (gerr) {
 817         g_critical("failed to write persistent state to %s: %s",
 818                     path, gerr->message);
 819         ret = false;
 820         goto out;
 821     }
 822
 823 out:
 824     if (gerr) {
 825         g_error_free(gerr);
 826     }
 827     if (keyfile) {
 828         g_key_file_free(keyfile);
 829     }
 830     g_free(data);
 831     return ret;
 832 }
 833
 834 static gboolean read_persistent_state(GAPersistentState *pstate,
 835                                       const gchar *path, gboolean frozen)
 836 {
 837     GKeyFile *keyfile = NULL;
 838     GError *gerr = NULL;
 839     struct stat st;
 840     gboolean ret = true;
 841
 842     g_assert(pstate);
 843
 844     if (stat(path, &st) == -1) {
 845         /* it's okay if state file doesn't exist, but any other error
 846          * indicates a permissions issue or some other misconfiguration
 847          * that we likely won't be able to recover from.
 848          */
 849         if (errno != ENOENT) {
 850             g_critical("unable to access state file at path %s: %s",
 851                        path, strerror(errno));
 852             ret = false;
 853             goto out;
 854         }
 855
 856         /* file doesn't exist. initialize state to default values and
 857          * attempt to save now. (we could wait till later when we have
 858          * modified state we need to commit, but if there's a problem,
 859          * such as a missing parent directory, we want to catch it now)
 860          *
 861          * there is a potential scenario where someone either managed to
 862          * update the agent from a version that didn't use a key store
 863          * while qemu-ga thought the filesystem was frozen, or
 864          * deleted the key store prior to issuing a fsfreeze, prior
 865          * to restarting the agent. in this case we go ahead and defer
 866          * initial creation till we actually have modified state to
 867          * write, otherwise fail to recover from freeze.
 868          */
 869         set_persistent_state_defaults(pstate);
 870         if (!frozen) {
 871             ret = write_persistent_state(pstate, path);
 872             if (!ret) {
 873                 g_critical("unable to create state file at path %s", path);
 874                 ret = false;
 875                 goto out;
 876             }
 877         }
 878         ret = true;
 879         goto out;
 880     }
 881
 882     keyfile = g_key_file_new();
 883     g_key_file_load_from_file(keyfile, path, 0, &gerr);
 884     if (gerr) {
 885         g_critical("error loading persistent state from path: %s, %s",
 886                    path, gerr->message);
 887         ret = false;
 888         goto out;
 889     }
 890
 891     persistent_state_from_keyfile(pstate, keyfile);
 892
 893 out:
 894     if (keyfile) {
 895         g_key_file_free(keyfile);
 896     }
 897     if (gerr) {
 898         g_error_free(gerr);
 899     }
 900
 901     return ret;
 902 }
 903
 904 int64_t ga_get_fd_handle(GAState *s, Error **errp)
 905 {
 906     int64_t handle;
 907
 908     g_assert(s->pstate_filepath);
 909     /* we blacklist commands and avoid operations that potentially require
 910      * writing to disk when we're in a frozen state. this includes opening
 911      * new files, so we should never get here in that situation
 912      */
 913     g_assert(!ga_is_frozen(s));
 914
 915     handle = s->pstate.fd_counter++;
 916
 917     /* This should never happen on a reasonable timeframe, as guest-file-open
 918      * would have to be issued 2^63 times */
 919     if (s->pstate.fd_counter == INT64_MAX) {
 920         abort();
 921     }
 922
 923     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
 924         error_setg(errp, "failed to commit persistent state to disk");
 925         return -1;
 926     }
 927
 928     return handle;
 929 }
 930
 931 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
 932 {
 933     printf("%s\n", qmp_command_name(cmd));
 934 }
 935
 936 static GList *split_list(const gchar *str, const gchar *delim)
 937 {
 938     GList *list = NULL;
 939     int i;
 940     gchar **strv;
 941
 942     strv = g_strsplit(str, delim, -1);
 943     for (i = 0; strv[i]; i++) {
 944         list = g_list_prepend(list, strv[i]);
 945     }
 946     g_free(strv);
 947
 948     return list;
 949 }
 950
 951 typedef struct GAConfig {
 952     char *channel_path;
 953     char *method;
 954     char *log_filepath;
 955     char *pid_filepath;
 956 #ifdef CONFIG_FSFREEZE
 957     char *fsfreeze_hook;
 958 #endif
 959     char *state_dir;
 960 #ifdef _WIN32
 961     const char *service;
 962 #endif
 963     gchar *bliststr; /* blacklist may point to this string */
 964     GList *blacklist;
 965     int daemonize;
 966     GLogLevelFlags log_level;
 967     int dumpconf;
 968 } GAConfig;
 969
 970 static void config_load(GAConfig *config)
 971 {
 972     GError *gerr = NULL;
 973     GKeyFile *keyfile;
 974     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
 975
 976     /* read system config */
 977     keyfile = g_key_file_new();
 978     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
 979         goto end;
 980     }
 981     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
 982         config->daemonize =
 983             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
 984     }
 985     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
 986         config->method =
 987             g_key_file_get_string(keyfile, "general", "method", &gerr);
 988     }
 989     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
 990         config->channel_path =
 991             g_key_file_get_string(keyfile, "general", "path", &gerr);
 992     }
 993     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
 994         config->log_filepath =
 995             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
 996     }
 997     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
 998         config->pid_filepath =
 999             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
1000     }
1001 #ifdef CONFIG_FSFREEZE
1002     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
1003         config->fsfreeze_hook =
1004             g_key_file_get_string(keyfile,
1005                                   "general", "fsfreeze-hook", &gerr);
1006     }
1007 #endif
1008     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
1009         config->state_dir =
1010             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1011     }
1012     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1013         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1014         /* enable all log levels */
1015         config->log_level = G_LOG_LEVEL_MASK;
1016     }
1017     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
1018         config->bliststr =
1019             g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1020         config->blacklist = g_list_concat(config->blacklist,
1021                                           split_list(config->bliststr, ","));
1022     }
1023
1024 end:
1025     g_key_file_free(keyfile);
1026     if (gerr &&
1027         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1028         g_critical("error loading configuration from path: %s, %s",
1029                    QGA_CONF_DEFAULT, gerr->message);
1030         exit(EXIT_FAILURE);
1031     }
1032     g_clear_error(&gerr);
1033 }
1034
1035 static gchar *list_join(GList *list, const gchar separator)
1036 {
1037     GString *str = g_string_new("");
1038
1039     while (list) {
1040         str = g_string_append(str, (gchar *)list->data);
1041         list = g_list_next(list);
1042         if (list) {
1043             str = g_string_append_c(str, separator);
1044         }
1045     }
1046
1047     return g_string_free(str, FALSE);
1048 }
1049
1050 static void config_dump(GAConfig *config)
1051 {
1052     GError *error = NULL;
1053     GKeyFile *keyfile;
1054     gchar *tmp;
1055
1056     keyfile = g_key_file_new();
1057     g_assert(keyfile);
1058
1059     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1060     g_key_file_set_string(keyfile, "general", "method", config->method);
1061     if (config->channel_path) {
1062         g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1063     }
1064     if (config->log_filepath) {
1065         g_key_file_set_string(keyfile, "general", "logfile",
1066                               config->log_filepath);
1067     }
1068     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1069 #ifdef CONFIG_FSFREEZE
1070     if (config->fsfreeze_hook) {
1071         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1072                               config->fsfreeze_hook);
1073     }
1074 #endif
1075     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1076     g_key_file_set_boolean(keyfile, "general", "verbose",
1077                            config->log_level == G_LOG_LEVEL_MASK);
1078     tmp = list_join(config->blacklist, ',');
1079     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1080     g_free(tmp);
1081
1082     tmp = g_key_file_to_data(keyfile, NULL, &error);
1083     if (error) {
1084         g_critical("Failed to dump keyfile: %s", error->message);
1085         g_clear_error(&error);
1086     } else {
1087         printf("%s", tmp);
1088     }
1089
1090     g_free(tmp);
1091     g_key_file_free(keyfile);
1092 }
1093
1094 static void config_parse(GAConfig *config, int argc, char **argv)
1095 {
1096     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1097     int opt_ind = 0, ch;
1098     const struct option lopt[] = {
1099         { "help", 0, NULL, 'h' },
1100         { "version", 0, NULL, 'V' },
1101         { "dump-conf", 0, NULL, 'D' },
1102         { "logfile", 1, NULL, 'l' },
1103         { "pidfile", 1, NULL, 'f' },
1104 #ifdef CONFIG_FSFREEZE
1105         { "fsfreeze-hook", 2, NULL, 'F' },
1106 #endif
1107         { "verbose", 0, NULL, 'v' },
1108         { "method", 1, NULL, 'm' },
1109         { "path", 1, NULL, 'p' },
1110         { "daemonize", 0, NULL, 'd' },
1111         { "blacklist", 1, NULL, 'b' },
1112 #ifdef _WIN32
1113         { "service", 1, NULL, 's' },
1114 #endif
1115         { "statedir", 1, NULL, 't' },
1116         { NULL, 0, NULL, 0 }
1117     };
1118
1119     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1120         switch (ch) {
1121         case 'm':
1122             g_free(config->method);
1123             config->method = g_strdup(optarg);
1124             break;
1125         case 'p':
1126             g_free(config->channel_path);
1127             config->channel_path = g_strdup(optarg);
1128             break;
1129         case 'l':
1130             g_free(config->log_filepath);
1131             config->log_filepath = g_strdup(optarg);
1132             break;
1133         case 'f':
1134             g_free(config->pid_filepath);
1135             config->pid_filepath = g_strdup(optarg);
1136             break;
1137 #ifdef CONFIG_FSFREEZE
1138         case 'F':
1139             g_free(config->fsfreeze_hook);
1140             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1141             break;
1142 #endif
1143         case 't':
1144             g_free(config->state_dir);
1145             config->state_dir = g_strdup(optarg);
1146             break;
1147         case 'v':
1148             /* enable all log levels */
1149             config->log_level = G_LOG_LEVEL_MASK;
1150             break;
1151         case 'V':
1152             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1153             exit(EXIT_SUCCESS);
1154         case 'd':
1155             config->daemonize = 1;
1156             break;
1157         case 'D':
1158             config->dumpconf = 1;
1159             break;
1160         case 'b': {
1161             if (is_help_option(optarg)) {
1162                 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1163                 exit(EXIT_SUCCESS);
1164             }
1165             config->blacklist = g_list_concat(config->blacklist,
1166                                              split_list(optarg, ","));
1167             break;
1168         }
1169 #ifdef _WIN32
1170         case 's':
1171             config->service = optarg;
1172             if (strcmp(config->service, "install") == 0) {
1173                 if (ga_install_vss_provider()) {
1174                     exit(EXIT_FAILURE);
1175                 }
1176                 if (ga_install_service(config->channel_path,
1177                                        config->log_filepath, config->state_dir)) {
1178                     exit(EXIT_FAILURE);
1179                 }
1180                 exit(EXIT_SUCCESS);
1181             } else if (strcmp(config->service, "uninstall") == 0) {
1182                 ga_uninstall_vss_provider();
1183                 exit(ga_uninstall_service());
1184             } else if (strcmp(config->service, "vss-install") == 0) {
1185                 if (ga_install_vss_provider()) {
1186                     exit(EXIT_FAILURE);
1187                 }
1188                 exit(EXIT_SUCCESS);
1189             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1190                 ga_uninstall_vss_provider();
1191                 exit(EXIT_SUCCESS);
1192             } else {
1193                 printf("Unknown service command.\n");
1194                 exit(EXIT_FAILURE);
1195             }
1196             break;
1197 #endif
1198         case 'h':
1199             usage(argv[0]);
1200             exit(EXIT_SUCCESS);
1201         case '?':
1202             g_print("Unknown option, try '%s --help' for more information.\n",
1203                     argv[0]);
1204             exit(EXIT_FAILURE);
1205         }
1206     }
1207 }
1208
1209 static void config_free(GAConfig *config)
1210 {
1211     g_free(config->method);
1212     g_free(config->log_filepath);
1213     g_free(config->pid_filepath);
1214     g_free(config->state_dir);
1215     g_free(config->channel_path);
1216     g_free(config->bliststr);
1217 #ifdef CONFIG_FSFREEZE
1218     g_free(config->fsfreeze_hook);
1219 #endif
1220     g_list_free_full(config->blacklist, g_free);
1221     g_free(config);
1222 }
1223
1224 static bool check_is_frozen(GAState *s)
1225 {
1226 #ifndef _WIN32
1227     /* check if a previous instance of qemu-ga exited with filesystems' state
1228      * marked as frozen. this could be a stale value (a non-qemu-ga process
1229      * or reboot may have since unfrozen them), but better to require an
1230      * uneeded unfreeze than to risk hanging on start-up
1231      */
1232     struct stat st;
1233     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1234         /* it's okay if the file doesn't exist, but if we can't access for
1235          * some other reason, such as permissions, there's a configuration
1236          * that needs to be addressed. so just bail now before we get into
1237          * more trouble later
1238          */
1239         if (errno != ENOENT) {
1240             g_critical("unable to access state file at path %s: %s",
1241                        s->state_filepath_isfrozen, strerror(errno));
1242             return EXIT_FAILURE;
1243         }
1244     } else {
1245         g_warning("previous instance appears to have exited with frozen"
1246                   " filesystems. deferring logging/pidfile creation and"
1247                   " disabling non-fsfreeze-safe commands until"
1248                   " guest-fsfreeze-thaw is issued, or filesystems are"
1249                   " manually unfrozen and the file %s is removed",
1250                   s->state_filepath_isfrozen);
1251         return true;
1252     }
1253 #endif
1254     return false;
1255 }
1256
1257 static int run_agent(GAState *s, GAConfig *config, int socket_activation)
1258 {
1259     ga_state = s;
1260
1261     g_log_set_default_handler(ga_log, s);
1262     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1263     ga_enable_logging(s);
1264
1265 #ifdef _WIN32
1266     /* On win32 the state directory is application specific (be it the default
1267      * or a user override). We got past the command line parsing; let's create
1268      * the directory (with any intermediate directories). If we run into an
1269      * error later on, we won't try to clean up the directory, it is considered
1270      * persistent.
1271      */
1272     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1273         g_critical("unable to create (an ancestor of) the state directory"
1274                    " '%s': %s", config->state_dir, strerror(errno));
1275         return EXIT_FAILURE;
1276     }
1277 #endif
1278
1279     if (ga_is_frozen(s)) {
1280         if (config->daemonize) {
1281             /* delay opening/locking of pidfile till filesystems are unfrozen */
1282             s->deferred_options.pid_filepath = config->pid_filepath;
1283             become_daemon(NULL);
1284         }
1285         if (config->log_filepath) {
1286             /* delay opening the log file till filesystems are unfrozen */
1287             s->deferred_options.log_filepath = config->log_filepath;
1288         }
1289         ga_disable_logging(s);
1290         qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1291     } else {
1292         if (config->daemonize) {
1293             become_daemon(config->pid_filepath);
1294         }
1295         if (config->log_filepath) {
1296             FILE *log_file = ga_open_logfile(config->log_filepath);
1297             if (!log_file) {
1298                 g_critical("unable to open specified log file: %s",
1299                            strerror(errno));
1300                 return EXIT_FAILURE;
1301             }
1302             s->log_file = log_file;
1303         }
1304     }
1305
1306     /* load persistent state from disk */
1307     if (!read_persistent_state(&s->pstate,
1308                                s->pstate_filepath,
1309                                ga_is_frozen(s))) {
1310         g_critical("failed to load persistent state");
1311         return EXIT_FAILURE;
1312     }
1313
1314     config->blacklist = ga_command_blacklist_init(config->blacklist);
1315     if (config->blacklist) {
1316         GList *l = config->blacklist;
1317         s->blacklist = config->blacklist;
1318         do {
1319             g_debug("disabling command: %s", (char *)l->data);
1320             qmp_disable_command(&ga_commands, l->data);
1321             l = g_list_next(l);
1322         } while (l);
1323     }
1324     s->command_state = ga_command_state_new();
1325     ga_command_state_init(s, s->command_state);
1326     ga_command_state_init_all(s->command_state);
1327     json_message_parser_init(&s->parser, process_event);
1328
1329 #ifndef _WIN32
1330     if (!register_signal_handlers()) {
1331         g_critical("failed to register signal handlers");
1332         return EXIT_FAILURE;
1333     }
1334 #endif
1335
1336     s->main_loop = g_main_loop_new(NULL, false);
1337
1338     if (!channel_init(ga_state, config->method, config->channel_path,
1339                       socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1340         g_critical("failed to initialize guest agent channel");
1341         return EXIT_FAILURE;
1342     }
1343 #ifndef _WIN32
1344     g_main_loop_run(ga_state->main_loop);
1345 #else
1346     if (config->daemonize) {
1347         SERVICE_TABLE_ENTRY service_table[] = {
1348             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1349         StartServiceCtrlDispatcher(service_table);
1350     } else {
1351         g_main_loop_run(ga_state->main_loop);
1352     }
1353 #endif
1354
1355     return EXIT_SUCCESS;
1356 }
1357
1358 int main(int argc, char **argv)
1359 {
1360     int ret = EXIT_SUCCESS;
1361     GAState *s = g_new0(GAState, 1);
1362     GAConfig *config = g_new0(GAConfig, 1);
1363     int socket_activation;
1364
1365     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1366
1367     qga_qmp_init_marshal(&ga_commands);
1368
1369     init_dfl_pathnames();
1370     config_load(config);
1371     config_parse(config, argc, argv);
1372
1373     if (config->pid_filepath == NULL) {
1374         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1375     }
1376
1377     if (config->state_dir == NULL) {
1378         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1379     }
1380
1381     if (config->method == NULL) {
1382         config->method = g_strdup("virtio-serial");
1383     }
1384
1385     socket_activation = check_socket_activation();
1386     if (socket_activation > 1) {
1387         g_critical("qemu-ga only supports listening on one socket");
1388         ret = EXIT_FAILURE;
1389         goto end;
1390     }
1391     if (socket_activation) {
1392         SocketAddress *addr;
1393
1394         g_free(config->method);
1395         g_free(config->channel_path);
1396         config->method = NULL;
1397         config->channel_path = NULL;
1398
1399         addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1400         if (addr) {
1401             if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1402                 config->method = g_strdup("unix-listen");
1403             } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1404                 config->method = g_strdup("vsock-listen");
1405             }
1406
1407             qapi_free_SocketAddress(addr);
1408         }
1409
1410         if (!config->method) {
1411             g_critical("unsupported listen fd type");
1412             ret = EXIT_FAILURE;
1413             goto end;
1414         }
1415     } else if (config->channel_path == NULL) {
1416         if (strcmp(config->method, "virtio-serial") == 0) {
1417             /* try the default path for the virtio-serial port */
1418             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1419         } else if (strcmp(config->method, "isa-serial") == 0) {
1420             /* try the default path for the serial port - COM1 */
1421             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1422         } else {
1423             g_critical("must specify a path for this channel");
1424             ret = EXIT_FAILURE;
1425             goto end;
1426         }
1427     }
1428
1429     s->log_level = config->log_level;
1430     s->log_file = stderr;
1431 #ifdef CONFIG_FSFREEZE
1432     s->fsfreeze_hook = config->fsfreeze_hook;
1433 #endif
1434     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1435     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1436                                                  config->state_dir);
1437     s->frozen = check_is_frozen(s);
1438
1439     if (config->dumpconf) {
1440         config_dump(config);
1441         goto end;
1442     }
1443
1444     ret = run_agent(s, config, socket_activation);
1445
1446 end:
1447     if (s->command_state) {
1448         ga_command_state_cleanup_all(s->command_state);
1449         ga_command_state_free(s->command_state);
1450         json_message_parser_destroy(&s->parser);
1451     }
1452     if (s->channel) {
1453         ga_channel_free(s->channel);
1454     }
1455     g_free(s->pstate_filepath);
1456     g_free(s->state_filepath_isfrozen);
1457
1458     if (config->daemonize) {
1459         unlink(config->pid_filepath);
1460     }
1461
1462     config_free(config);
1463     if (s->main_loop) {
1464         g_main_loop_unref(s->main_loop);
1465     }
1466     g_free(s);
1467
1468     return ret;
1469 }