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