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