qga/main.c

   1 /*
   2  * QEMU Guest Agent
   3  *
   4  * Copyright IBM Corp. 2011
   5  *
   6  * Authors:
   7  *  Adam Litke        <aglitke@linux.vnet.ibm.com>
   8  *  Michael Roth      <mdroth@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  */
  13 #include "qemu/osdep.h"
  14 #include <getopt.h>
  15 #include <glib/gstdio.h>
  16 #ifndef _WIN32
  17 #include <syslog.h>
  18 #include <sys/wait.h>
  19 #endif
  20 #include "qapi/qmp/json-streamer.h"
  21 #include "qapi/qmp/json-parser.h"
  22 #include "qapi/qmp/qint.h"
  23 #include "qapi/qmp/qjson.h"
  24 #include "qga/guest-agent-core.h"
  25 #include "qemu/module.h"
  26 #include "qapi/qmp/qerror.h"
  27 #include "qapi/qmp/dispatch.h"
  28 #include "qga/channel.h"
  29 #include "qemu/bswap.h"
  30 #include "qemu/help_option.h"
  31 #include "qemu/sockets.h"
  32 #include "qemu/systemd.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      */
 135     if (ga_is_frozen(ga_state)) {
 136         return;
 137     }
 138     g_debug("received signal num %d, quitting", sig);
 139
 140     if (g_main_loop_is_running(ga_state->main_loop)) {
 141         g_main_loop_quit(ga_state->main_loop);
 142     }
 143 }
 144
 145 #ifndef _WIN32
 146 static gboolean register_signal_handlers(void)
 147 {
 148     struct sigaction sigact;
 149     int ret;
 150
 151     memset(&sigact, 0, sizeof(struct sigaction));
 152     sigact.sa_handler = quit_handler;
 153
 154     ret = sigaction(SIGINT, &sigact, NULL);
 155     if (ret == -1) {
 156         g_error("error configuring signal handler: %s", strerror(errno));
 157     }
 158     ret = sigaction(SIGTERM, &sigact, NULL);
 159     if (ret == -1) {
 160         g_error("error configuring signal handler: %s", strerror(errno));
 161     }
 162
 163     sigact.sa_handler = SIG_IGN;
 164     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
 165         g_error("error configuring SIGPIPE signal handler: %s",
 166                 strerror(errno));
 167     }
 168
 169     return true;
 170 }
 171
 172 /* TODO: use this in place of all post-fork() fclose(std*) callers */
 173 void reopen_fd_to_null(int fd)
 174 {
 175     int nullfd;
 176
 177     nullfd = open("/dev/null", O_RDWR);
 178     if (nullfd < 0) {
 179         return;
 180     }
 181
 182     dup2(nullfd, fd);
 183
 184     if (nullfd != fd) {
 185         close(nullfd);
 186     }
 187 }
 188 #endif
 189
 190 static void usage(const char *cmd)
 191 {
 192     printf(
 193 "Usage: %s [-m <method> -p <path>] [<options>]\n"
 194 "QEMU Guest Agent %s\n"
 195 "\n"
 196 "  -m, --method      transport method: one of unix-listen, virtio-serial,\n"
 197 "                    isa-serial, or vsock-listen (virtio-serial is the default)\n"
 198 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
 199 "                    %s,\n"
 200 "                    the default for isa-serial is:\n"
 201 "                    %s)\n"
 202 "  -l, --logfile     set logfile path, logs to stderr by default\n"
 203 "  -f, --pidfile     specify pidfile (default is %s)\n"
 204 #ifdef CONFIG_FSFREEZE
 205 "  -F, --fsfreeze-hook\n"
 206 "                    enable fsfreeze hook. Accepts an optional argument that\n"
 207 "                    specifies script to run on freeze/thaw. Script will be\n"
 208 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
 209 "                    (default is %s)\n"
 210 "                    If using -F with an argument, do not follow -F with a\n"
 211 "                    space.\n"
 212 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
 213 #endif
 214 "  -t, --statedir    specify dir to store state information (absolute paths\n"
 215 "                    only, default is %s)\n"
 216 "  -v, --verbose     log extra debugging information\n"
 217 "  -V, --version     print version information and exit\n"
 218 "  -d, --daemonize   become a daemon\n"
 219 #ifdef _WIN32
 220 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 221 #endif
 222 "  -b, --blacklist   comma-separated list of RPCs to disable (no spaces, \"?\"\n"
 223 "                    to list available RPCs)\n"
 224 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 225 "                    options / command-line parameters to stdout\n"
 226 "  -h, --help        display this help and exit\n"
 227 "\n"
 228 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
 229     , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
 230     dfl_pathnames.pidfile,
 231 #ifdef CONFIG_FSFREEZE
 232     QGA_FSFREEZE_HOOK_DEFAULT,
 233 #endif
 234     dfl_pathnames.state_dir);
 235 }
 236
 237 static const char *ga_log_level_str(GLogLevelFlags level)
 238 {
 239     switch (level & G_LOG_LEVEL_MASK) {
 240         case G_LOG_LEVEL_ERROR:
 241             return "error";
 242         case G_LOG_LEVEL_CRITICAL:
 243             return "critical";
 244         case G_LOG_LEVEL_WARNING:
 245             return "warning";
 246         case G_LOG_LEVEL_MESSAGE:
 247             return "message";
 248         case G_LOG_LEVEL_INFO:
 249             return "info";
 250         case G_LOG_LEVEL_DEBUG:
 251             return "debug";
 252         default:
 253             return "user";
 254     }
 255 }
 256
 257 bool ga_logging_enabled(GAState *s)
 258 {
 259     return s->logging_enabled;
 260 }
 261
 262 void ga_disable_logging(GAState *s)
 263 {
 264     s->logging_enabled = false;
 265 }
 266
 267 void ga_enable_logging(GAState *s)
 268 {
 269     s->logging_enabled = true;
 270 }
 271
 272 static void ga_log(const gchar *domain, GLogLevelFlags level,
 273                    const gchar *msg, gpointer opaque)
 274 {
 275     GAState *s = opaque;
 276     GTimeVal time;
 277     const char *level_str = ga_log_level_str(level);
 278
 279     if (!ga_logging_enabled(s)) {
 280         return;
 281     }
 282
 283     level &= G_LOG_LEVEL_MASK;
 284 #ifndef _WIN32
 285     if (g_strcmp0(domain, "syslog") == 0) {
 286         syslog(LOG_INFO, "%s: %s", level_str, msg);
 287     } else if (level & s->log_level) {
 288 #else
 289     if (level & s->log_level) {
 290 #endif
 291         g_get_current_time(&time);
 292         fprintf(s->log_file,
 293                 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
 294         fflush(s->log_file);
 295     }
 296 }
 297
 298 void ga_set_response_delimited(GAState *s)
 299 {
 300     s->delimit_response = true;
 301 }
 302
 303 static FILE *ga_open_logfile(const char *logfile)
 304 {
 305     FILE *f;
 306
 307     f = fopen(logfile, "a");
 308     if (!f) {
 309         return NULL;
 310     }
 311
 312     qemu_set_cloexec(fileno(f));
 313     return f;
 314 }
 315
 316 #ifndef _WIN32
 317 static bool ga_open_pidfile(const char *pidfile)
 318 {
 319     int pidfd;
 320     char pidstr[32];
 321
 322     pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
 323     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
 324         g_critical("Cannot lock pid file, %s", strerror(errno));
 325         if (pidfd != -1) {
 326             close(pidfd);
 327         }
 328         return false;
 329     }
 330
 331     if (ftruncate(pidfd, 0)) {
 332         g_critical("Failed to truncate pid file");
 333         goto fail;
 334     }
 335     snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
 336     if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
 337         g_critical("Failed to write pid file");
 338         goto fail;
 339     }
 340
 341     /* keep pidfile open & locked forever */
 342     return true;
 343
 344 fail:
 345     unlink(pidfile);
 346     close(pidfd);
 347     return false;
 348 }
 349 #else /* _WIN32 */
 350 static bool ga_open_pidfile(const char *pidfile)
 351 {
 352     return true;
 353 }
 354 #endif
 355
 356 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
 357 {
 358     return strcmp(str1, str2);
 359 }
 360
 361 /* disable commands that aren't safe for fsfreeze */
 362 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
 363 {
 364     bool whitelisted = false;
 365     int i = 0;
 366     const char *name = qmp_command_name(cmd);
 367
 368     while (ga_freeze_whitelist[i] != NULL) {
 369         if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
 370             whitelisted = true;
 371         }
 372         i++;
 373     }
 374     if (!whitelisted) {
 375         g_debug("disabling command: %s", name);
 376         qmp_disable_command(&ga_commands, name);
 377     }
 378 }
 379
 380 /* [re-]enable all commands, except those explicitly blacklisted by user */
 381 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
 382 {
 383     GList *blacklist = opaque;
 384     const char *name = qmp_command_name(cmd);
 385
 386     if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
 387         !qmp_command_is_enabled(cmd)) {
 388         g_debug("enabling command: %s", name);
 389         qmp_enable_command(&ga_commands, name);
 390     }
 391 }
 392
 393 static bool ga_create_file(const char *path)
 394 {
 395     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
 396     if (fd == -1) {
 397         g_warning("unable to open/create file %s: %s", path, strerror(errno));
 398         return false;
 399     }
 400     close(fd);
 401     return true;
 402 }
 403
 404 static bool ga_delete_file(const char *path)
 405 {
 406     int ret = unlink(path);
 407     if (ret == -1) {
 408         g_warning("unable to delete file: %s: %s", path, strerror(errno));
 409         return false;
 410     }
 411
 412     return true;
 413 }
 414
 415 bool ga_is_frozen(GAState *s)
 416 {
 417     return s->frozen;
 418 }
 419
 420 void ga_set_frozen(GAState *s)
 421 {
 422     if (ga_is_frozen(s)) {
 423         return;
 424     }
 425     /* disable all non-whitelisted (for frozen state) commands */
 426     qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
 427     g_warning("disabling logging due to filesystem freeze");
 428     ga_disable_logging(s);
 429     s->frozen = true;
 430     if (!ga_create_file(s->state_filepath_isfrozen)) {
 431         g_warning("unable to create %s, fsfreeze may not function properly",
 432                   s->state_filepath_isfrozen);
 433     }
 434 }
 435
 436 void ga_unset_frozen(GAState *s)
 437 {
 438     if (!ga_is_frozen(s)) {
 439         return;
 440     }
 441
 442     /* if we delayed creation/opening of pid/log files due to being
 443      * in a frozen state at start up, do it now
 444      */
 445     if (s->deferred_options.log_filepath) {
 446         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
 447         if (!s->log_file) {
 448             s->log_file = stderr;
 449         }
 450         s->deferred_options.log_filepath = NULL;
 451     }
 452     ga_enable_logging(s);
 453     g_warning("logging re-enabled due to filesystem unfreeze");
 454     if (s->deferred_options.pid_filepath) {
 455         if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
 456             g_warning("failed to create/open pid file");
 457         }
 458         s->deferred_options.pid_filepath = NULL;
 459     }
 460
 461     /* enable all disabled, non-blacklisted commands */
 462     qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
 463     s->frozen = false;
 464     if (!ga_delete_file(s->state_filepath_isfrozen)) {
 465         g_warning("unable to delete %s, fsfreeze may not function properly",
 466                   s->state_filepath_isfrozen);
 467     }
 468 }
 469
 470 #ifdef CONFIG_FSFREEZE
 471 const char *ga_fsfreeze_hook(GAState *s)
 472 {
 473     return s->fsfreeze_hook;
 474 }
 475 #endif
 476
 477 static void become_daemon(const char *pidfile)
 478 {
 479 #ifndef _WIN32
 480     pid_t pid, sid;
 481
 482     pid = fork();
 483     if (pid < 0) {
 484         exit(EXIT_FAILURE);
 485     }
 486     if (pid > 0) {
 487         exit(EXIT_SUCCESS);
 488     }
 489
 490     if (pidfile) {
 491         if (!ga_open_pidfile(pidfile)) {
 492             g_critical("failed to create pidfile");
 493             exit(EXIT_FAILURE);
 494         }
 495     }
 496
 497     umask(S_IRWXG | S_IRWXO);
 498     sid = setsid();
 499     if (sid < 0) {
 500         goto fail;
 501     }
 502     if ((chdir("/")) < 0) {
 503         goto fail;
 504     }
 505
 506     reopen_fd_to_null(STDIN_FILENO);
 507     reopen_fd_to_null(STDOUT_FILENO);
 508     reopen_fd_to_null(STDERR_FILENO);
 509     return;
 510
 511 fail:
 512     if (pidfile) {
 513         unlink(pidfile);
 514     }
 515     g_critical("failed to daemonize");
 516     exit(EXIT_FAILURE);
 517 #endif
 518 }
 519
 520 static int send_response(GAState *s, QObject *payload)
 521 {
 522     const char *buf;
 523     QString *payload_qstr, *response_qstr;
 524     GIOStatus status;
 525
 526     g_assert(payload && s->channel);
 527
 528     payload_qstr = qobject_to_json(payload);
 529     if (!payload_qstr) {
 530         return -EINVAL;
 531     }
 532
 533     if (s->delimit_response) {
 534         s->delimit_response = false;
 535         response_qstr = qstring_new();
 536         qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
 537         qstring_append(response_qstr, qstring_get_str(payload_qstr));
 538         QDECREF(payload_qstr);
 539     } else {
 540         response_qstr = payload_qstr;
 541     }
 542
 543     qstring_append_chr(response_qstr, '\n');
 544     buf = qstring_get_str(response_qstr);
 545     status = ga_channel_write_all(s->channel, buf, strlen(buf));
 546     QDECREF(response_qstr);
 547     if (status != G_IO_STATUS_NORMAL) {
 548         return -EIO;
 549     }
 550
 551     return 0;
 552 }
 553
 554 static void process_command(GAState *s, QDict *req)
 555 {
 556     QObject *rsp = NULL;
 557     int ret;
 558
 559     g_assert(req);
 560     g_debug("processing command");
 561     rsp = qmp_dispatch(&ga_commands, QOBJECT(req));
 562     if (rsp) {
 563         ret = send_response(s, rsp);
 564         if (ret < 0) {
 565             g_warning("error sending response: %s", strerror(-ret));
 566         }
 567         qobject_decref(rsp);
 568     }
 569 }
 570
 571 /* handle requests/control events coming in over the channel */
 572 static void process_event(JSONMessageParser *parser, GQueue *tokens)
 573 {
 574     GAState *s = container_of(parser, GAState, parser);
 575     QDict *qdict;
 576     Error *err = NULL;
 577     int ret;
 578
 579     g_assert(s && parser);
 580
 581     g_debug("process_event: called");
 582     qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
 583     if (err || !qdict) {
 584         QDECREF(qdict);
 585         qdict = qdict_new();
 586         if (!err) {
 587             g_warning("failed to parse event: unknown error");
 588             error_setg(&err, QERR_JSON_PARSING);
 589         } else {
 590             g_warning("failed to parse event: %s", error_get_pretty(err));
 591         }
 592         qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 593         error_free(err);
 594     }
 595
 596     /* handle host->guest commands */
 597     if (qdict_haskey(qdict, "execute")) {
 598         process_command(s, qdict);
 599     } else {
 600         if (!qdict_haskey(qdict, "error")) {
 601             QDECREF(qdict);
 602             qdict = qdict_new();
 603             g_warning("unrecognized payload format");
 604             error_setg(&err, QERR_UNSUPPORTED);
 605             qdict_put_obj(qdict, "error", qmp_build_error_object(err));
 606             error_free(err);
 607         }
 608         ret = send_response(s, QOBJECT(qdict));
 609         if (ret < 0) {
 610             g_warning("error sending error response: %s", strerror(-ret));
 611         }
 612     }
 613
 614     QDECREF(qdict);
 615 }
 616
 617 /* false return signals GAChannel to close the current client connection */
 618 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
 619 {
 620     GAState *s = data;
 621     gchar buf[QGA_READ_COUNT_DEFAULT+1];
 622     gsize count;
 623     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
 624     switch (status) {
 625     case G_IO_STATUS_ERROR:
 626         g_warning("error reading channel");
 627         return false;
 628     case G_IO_STATUS_NORMAL:
 629         buf[count] = 0;
 630         g_debug("read data, count: %d, data: %s", (int)count, buf);
 631         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
 632         break;
 633     case G_IO_STATUS_EOF:
 634         g_debug("received EOF");
 635         if (!s->virtio) {
 636             return false;
 637         }
 638         /* fall through */
 639     case G_IO_STATUS_AGAIN:
 640         /* virtio causes us to spin here when no process is attached to
 641          * host-side chardev. sleep a bit to mitigate this
 642          */
 643         if (s->virtio) {
 644             usleep(100*1000);
 645         }
 646         return true;
 647     default:
 648         g_warning("unknown channel read status, closing");
 649         return false;
 650     }
 651     return true;
 652 }
 653
 654 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
 655                              int listen_fd)
 656 {
 657     GAChannelMethod channel_method;
 658
 659     if (strcmp(method, "virtio-serial") == 0) {
 660         s->virtio = true; /* virtio requires special handling in some cases */
 661         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
 662     } else if (strcmp(method, "isa-serial") == 0) {
 663         channel_method = GA_CHANNEL_ISA_SERIAL;
 664     } else if (strcmp(method, "unix-listen") == 0) {
 665         channel_method = GA_CHANNEL_UNIX_LISTEN;
 666     } else if (strcmp(method, "vsock-listen") == 0) {
 667         channel_method = GA_CHANNEL_VSOCK_LISTEN;
 668     } else {
 669         g_critical("unsupported channel method/type: %s", method);
 670         return false;
 671     }
 672
 673     s->channel = ga_channel_new(channel_method, path, listen_fd,
 674                                 channel_event_cb, s);
 675     if (!s->channel) {
 676         g_critical("failed to create guest agent channel");
 677         return false;
 678     }
 679
 680     return true;
 681 }
 682
 683 #ifdef _WIN32
 684 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
 685                                   LPVOID ctx)
 686 {
 687     DWORD ret = NO_ERROR;
 688     GAService *service = &ga_state->service;
 689
 690     switch (ctrl)
 691     {
 692         case SERVICE_CONTROL_STOP:
 693         case SERVICE_CONTROL_SHUTDOWN:
 694             quit_handler(SIGTERM);
 695             service->status.dwCurrentState = SERVICE_STOP_PENDING;
 696             SetServiceStatus(service->status_handle, &service->status);
 697             break;
 698
 699         default:
 700             ret = ERROR_CALL_NOT_IMPLEMENTED;
 701     }
 702     return ret;
 703 }
 704
 705 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
 706 {
 707     GAService *service = &ga_state->service;
 708
 709     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
 710         service_ctrl_handler, NULL);
 711
 712     if (service->status_handle == 0) {
 713         g_critical("Failed to register extended requests function!\n");
 714         return;
 715     }
 716
 717     service->status.dwServiceType = SERVICE_WIN32;
 718     service->status.dwCurrentState = SERVICE_RUNNING;
 719     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
 720     service->status.dwWin32ExitCode = NO_ERROR;
 721     service->status.dwServiceSpecificExitCode = NO_ERROR;
 722     service->status.dwCheckPoint = 0;
 723     service->status.dwWaitHint = 0;
 724     SetServiceStatus(service->status_handle, &service->status);
 725
 726     g_main_loop_run(ga_state->main_loop);
 727
 728     service->status.dwCurrentState = SERVICE_STOPPED;
 729     SetServiceStatus(service->status_handle, &service->status);
 730 }
 731 #endif
 732
 733 static void set_persistent_state_defaults(GAPersistentState *pstate)
 734 {
 735     g_assert(pstate);
 736     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
 737 }
 738
 739 static void persistent_state_from_keyfile(GAPersistentState *pstate,
 740                                           GKeyFile *keyfile)
 741 {
 742     g_assert(pstate);
 743     g_assert(keyfile);
 744     /* if any fields are missing, either because the file was tampered with
 745      * by agents of chaos, or because the field wasn't present at the time the
 746      * file was created, the best we can ever do is start over with the default
 747      * values. so load them now, and ignore any errors in accessing key-value
 748      * pairs
 749      */
 750     set_persistent_state_defaults(pstate);
 751
 752     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
 753         pstate->fd_counter =
 754             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
 755     }
 756 }
 757
 758 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
 759                                         GKeyFile *keyfile)
 760 {
 761     g_assert(pstate);
 762     g_assert(keyfile);
 763
 764     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
 765 }
 766
 767 static gboolean write_persistent_state(const GAPersistentState *pstate,
 768                                        const gchar *path)
 769 {
 770     GKeyFile *keyfile = g_key_file_new();
 771     GError *gerr = NULL;
 772     gboolean ret = true;
 773     gchar *data = NULL;
 774     gsize data_len;
 775
 776     g_assert(pstate);
 777
 778     persistent_state_to_keyfile(pstate, keyfile);
 779     data = g_key_file_to_data(keyfile, &data_len, &gerr);
 780     if (gerr) {
 781         g_critical("failed to convert persistent state to string: %s",
 782                    gerr->message);
 783         ret = false;
 784         goto out;
 785     }
 786
 787     g_file_set_contents(path, data, data_len, &gerr);
 788     if (gerr) {
 789         g_critical("failed to write persistent state to %s: %s",
 790                     path, gerr->message);
 791         ret = false;
 792         goto out;
 793     }
 794
 795 out:
 796     if (gerr) {
 797         g_error_free(gerr);
 798     }
 799     if (keyfile) {
 800         g_key_file_free(keyfile);
 801     }
 802     g_free(data);
 803     return ret;
 804 }
 805
 806 static gboolean read_persistent_state(GAPersistentState *pstate,
 807                                       const gchar *path, gboolean frozen)
 808 {
 809     GKeyFile *keyfile = NULL;
 810     GError *gerr = NULL;
 811     struct stat st;
 812     gboolean ret = true;
 813
 814     g_assert(pstate);
 815
 816     if (stat(path, &st) == -1) {
 817         /* it's okay if state file doesn't exist, but any other error
 818          * indicates a permissions issue or some other misconfiguration
 819          * that we likely won't be able to recover from.
 820          */
 821         if (errno != ENOENT) {
 822             g_critical("unable to access state file at path %s: %s",
 823                        path, strerror(errno));
 824             ret = false;
 825             goto out;
 826         }
 827
 828         /* file doesn't exist. initialize state to default values and
 829          * attempt to save now. (we could wait till later when we have
 830          * modified state we need to commit, but if there's a problem,
 831          * such as a missing parent directory, we want to catch it now)
 832          *
 833          * there is a potential scenario where someone either managed to
 834          * update the agent from a version that didn't use a key store
 835          * while qemu-ga thought the filesystem was frozen, or
 836          * deleted the key store prior to issuing a fsfreeze, prior
 837          * to restarting the agent. in this case we go ahead and defer
 838          * initial creation till we actually have modified state to
 839          * write, otherwise fail to recover from freeze.
 840          */
 841         set_persistent_state_defaults(pstate);
 842         if (!frozen) {
 843             ret = write_persistent_state(pstate, path);
 844             if (!ret) {
 845                 g_critical("unable to create state file at path %s", path);
 846                 ret = false;
 847                 goto out;
 848             }
 849         }
 850         ret = true;
 851         goto out;
 852     }
 853
 854     keyfile = g_key_file_new();
 855     g_key_file_load_from_file(keyfile, path, 0, &gerr);
 856     if (gerr) {
 857         g_critical("error loading persistent state from path: %s, %s",
 858                    path, gerr->message);
 859         ret = false;
 860         goto out;
 861     }
 862
 863     persistent_state_from_keyfile(pstate, keyfile);
 864
 865 out:
 866     if (keyfile) {
 867         g_key_file_free(keyfile);
 868     }
 869     if (gerr) {
 870         g_error_free(gerr);
 871     }
 872
 873     return ret;
 874 }
 875
 876 int64_t ga_get_fd_handle(GAState *s, Error **errp)
 877 {
 878     int64_t handle;
 879
 880     g_assert(s->pstate_filepath);
 881     /* we blacklist commands and avoid operations that potentially require
 882      * writing to disk when we're in a frozen state. this includes opening
 883      * new files, so we should never get here in that situation
 884      */
 885     g_assert(!ga_is_frozen(s));
 886
 887     handle = s->pstate.fd_counter++;
 888
 889     /* This should never happen on a reasonable timeframe, as guest-file-open
 890      * would have to be issued 2^63 times */
 891     if (s->pstate.fd_counter == INT64_MAX) {
 892         abort();
 893     }
 894
 895     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
 896         error_setg(errp, "failed to commit persistent state to disk");
 897         return -1;
 898     }
 899
 900     return handle;
 901 }
 902
 903 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
 904 {
 905     printf("%s\n", qmp_command_name(cmd));
 906 }
 907
 908 static GList *split_list(const gchar *str, const gchar *delim)
 909 {
 910     GList *list = NULL;
 911     int i;
 912     gchar **strv;
 913
 914     strv = g_strsplit(str, delim, -1);
 915     for (i = 0; strv[i]; i++) {
 916         list = g_list_prepend(list, strv[i]);
 917     }
 918     g_free(strv);
 919
 920     return list;
 921 }
 922
 923 typedef struct GAConfig {
 924     char *channel_path;
 925     char *method;
 926     char *log_filepath;
 927     char *pid_filepath;
 928 #ifdef CONFIG_FSFREEZE
 929     char *fsfreeze_hook;
 930 #endif
 931     char *state_dir;
 932 #ifdef _WIN32
 933     const char *service;
 934 #endif
 935     gchar *bliststr; /* blacklist may point to this string */
 936     GList *blacklist;
 937     int daemonize;
 938     GLogLevelFlags log_level;
 939     int dumpconf;
 940 } GAConfig;
 941
 942 static void config_load(GAConfig *config)
 943 {
 944     GError *gerr = NULL;
 945     GKeyFile *keyfile;
 946     const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
 947
 948     /* read system config */
 949     keyfile = g_key_file_new();
 950     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
 951         goto end;
 952     }
 953     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
 954         config->daemonize =
 955             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
 956     }
 957     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
 958         config->method =
 959             g_key_file_get_string(keyfile, "general", "method", &gerr);
 960     }
 961     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
 962         config->channel_path =
 963             g_key_file_get_string(keyfile, "general", "path", &gerr);
 964     }
 965     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
 966         config->log_filepath =
 967             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
 968     }
 969     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
 970         config->pid_filepath =
 971             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
 972     }
 973 #ifdef CONFIG_FSFREEZE
 974     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
 975         config->fsfreeze_hook =
 976             g_key_file_get_string(keyfile,
 977                                   "general", "fsfreeze-hook", &gerr);
 978     }
 979 #endif
 980     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
 981         config->state_dir =
 982             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
 983     }
 984     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
 985         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
 986         /* enable all log levels */
 987         config->log_level = G_LOG_LEVEL_MASK;
 988     }
 989     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
 990         config->bliststr =
 991             g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
 992         config->blacklist = g_list_concat(config->blacklist,
 993                                           split_list(config->bliststr, ","));
 994     }
 995
 996 end:
 997     g_key_file_free(keyfile);
 998     if (gerr &&
 999         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1000         g_critical("error loading configuration from path: %s, %s",
1001                    QGA_CONF_DEFAULT, gerr->message);
1002         exit(EXIT_FAILURE);
1003     }
1004     g_clear_error(&gerr);
1005 }
1006
1007 static gchar *list_join(GList *list, const gchar separator)
1008 {
1009     GString *str = g_string_new("");
1010
1011     while (list) {
1012         str = g_string_append(str, (gchar *)list->data);
1013         list = g_list_next(list);
1014         if (list) {
1015             str = g_string_append_c(str, separator);
1016         }
1017     }
1018
1019     return g_string_free(str, FALSE);
1020 }
1021
1022 static void config_dump(GAConfig *config)
1023 {
1024     GError *error = NULL;
1025     GKeyFile *keyfile;
1026     gchar *tmp;
1027
1028     keyfile = g_key_file_new();
1029     g_assert(keyfile);
1030
1031     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1032     g_key_file_set_string(keyfile, "general", "method", config->method);
1033     if (config->channel_path) {
1034         g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1035     }
1036     if (config->log_filepath) {
1037         g_key_file_set_string(keyfile, "general", "logfile",
1038                               config->log_filepath);
1039     }
1040     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1041 #ifdef CONFIG_FSFREEZE
1042     if (config->fsfreeze_hook) {
1043         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1044                               config->fsfreeze_hook);
1045     }
1046 #endif
1047     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1048     g_key_file_set_boolean(keyfile, "general", "verbose",
1049                            config->log_level == G_LOG_LEVEL_MASK);
1050     tmp = list_join(config->blacklist, ',');
1051     g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1052     g_free(tmp);
1053
1054     tmp = g_key_file_to_data(keyfile, NULL, &error);
1055     printf("%s", tmp);
1056
1057     g_free(tmp);
1058     g_key_file_free(keyfile);
1059 }
1060
1061 static void config_parse(GAConfig *config, int argc, char **argv)
1062 {
1063     const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1064     int opt_ind = 0, ch;
1065     const struct option lopt[] = {
1066         { "help", 0, NULL, 'h' },
1067         { "version", 0, NULL, 'V' },
1068         { "dump-conf", 0, NULL, 'D' },
1069         { "logfile", 1, NULL, 'l' },
1070         { "pidfile", 1, NULL, 'f' },
1071 #ifdef CONFIG_FSFREEZE
1072         { "fsfreeze-hook", 2, NULL, 'F' },
1073 #endif
1074         { "verbose", 0, NULL, 'v' },
1075         { "method", 1, NULL, 'm' },
1076         { "path", 1, NULL, 'p' },
1077         { "daemonize", 0, NULL, 'd' },
1078         { "blacklist", 1, NULL, 'b' },
1079 #ifdef _WIN32
1080         { "service", 1, NULL, 's' },
1081 #endif
1082         { "statedir", 1, NULL, 't' },
1083         { NULL, 0, NULL, 0 }
1084     };
1085
1086     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1087         switch (ch) {
1088         case 'm':
1089             g_free(config->method);
1090             config->method = g_strdup(optarg);
1091             break;
1092         case 'p':
1093             g_free(config->channel_path);
1094             config->channel_path = g_strdup(optarg);
1095             break;
1096         case 'l':
1097             g_free(config->log_filepath);
1098             config->log_filepath = g_strdup(optarg);
1099             break;
1100         case 'f':
1101             g_free(config->pid_filepath);
1102             config->pid_filepath = g_strdup(optarg);
1103             break;
1104 #ifdef CONFIG_FSFREEZE
1105         case 'F':
1106             g_free(config->fsfreeze_hook);
1107             config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1108             break;
1109 #endif
1110         case 't':
1111             g_free(config->state_dir);
1112             config->state_dir = g_strdup(optarg);
1113             break;
1114         case 'v':
1115             /* enable all log levels */
1116             config->log_level = G_LOG_LEVEL_MASK;
1117             break;
1118         case 'V':
1119             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1120             exit(EXIT_SUCCESS);
1121         case 'd':
1122             config->daemonize = 1;
1123             break;
1124         case 'D':
1125             config->dumpconf = 1;
1126             break;
1127         case 'b': {
1128             if (is_help_option(optarg)) {
1129                 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1130                 exit(EXIT_SUCCESS);
1131             }
1132             config->blacklist = g_list_concat(config->blacklist,
1133                                              split_list(optarg, ","));
1134             break;
1135         }
1136 #ifdef _WIN32
1137         case 's':
1138             config->service = optarg;
1139             if (strcmp(config->service, "install") == 0) {
1140                 if (ga_install_vss_provider()) {
1141                     exit(EXIT_FAILURE);
1142                 }
1143                 if (ga_install_service(config->channel_path,
1144                                        config->log_filepath, config->state_dir)) {
1145                     exit(EXIT_FAILURE);
1146                 }
1147                 exit(EXIT_SUCCESS);
1148             } else if (strcmp(config->service, "uninstall") == 0) {
1149                 ga_uninstall_vss_provider();
1150                 exit(ga_uninstall_service());
1151             } else if (strcmp(config->service, "vss-install") == 0) {
1152                 if (ga_install_vss_provider()) {
1153                     exit(EXIT_FAILURE);
1154                 }
1155                 exit(EXIT_SUCCESS);
1156             } else if (strcmp(config->service, "vss-uninstall") == 0) {
1157                 ga_uninstall_vss_provider();
1158                 exit(EXIT_SUCCESS);
1159             } else {
1160                 printf("Unknown service command.\n");
1161                 exit(EXIT_FAILURE);
1162             }
1163             break;
1164 #endif
1165         case 'h':
1166             usage(argv[0]);
1167             exit(EXIT_SUCCESS);
1168         case '?':
1169             g_print("Unknown option, try '%s --help' for more information.\n",
1170                     argv[0]);
1171             exit(EXIT_FAILURE);
1172         }
1173     }
1174 }
1175
1176 static void config_free(GAConfig *config)
1177 {
1178     g_free(config->method);
1179     g_free(config->log_filepath);
1180     g_free(config->pid_filepath);
1181     g_free(config->state_dir);
1182     g_free(config->channel_path);
1183     g_free(config->bliststr);
1184 #ifdef CONFIG_FSFREEZE
1185     g_free(config->fsfreeze_hook);
1186 #endif
1187     g_list_free_full(config->blacklist, g_free);
1188     g_free(config);
1189 }
1190
1191 static bool check_is_frozen(GAState *s)
1192 {
1193 #ifndef _WIN32
1194     /* check if a previous instance of qemu-ga exited with filesystems' state
1195      * marked as frozen. this could be a stale value (a non-qemu-ga process
1196      * or reboot may have since unfrozen them), but better to require an
1197      * uneeded unfreeze than to risk hanging on start-up
1198      */
1199     struct stat st;
1200     if (stat(s->state_filepath_isfrozen, &st) == -1) {
1201         /* it's okay if the file doesn't exist, but if we can't access for
1202          * some other reason, such as permissions, there's a configuration
1203          * that needs to be addressed. so just bail now before we get into
1204          * more trouble later
1205          */
1206         if (errno != ENOENT) {
1207             g_critical("unable to access state file at path %s: %s",
1208                        s->state_filepath_isfrozen, strerror(errno));
1209             return EXIT_FAILURE;
1210         }
1211     } else {
1212         g_warning("previous instance appears to have exited with frozen"
1213                   " filesystems. deferring logging/pidfile creation and"
1214                   " disabling non-fsfreeze-safe commands until"
1215                   " guest-fsfreeze-thaw is issued, or filesystems are"
1216                   " manually unfrozen and the file %s is removed",
1217                   s->state_filepath_isfrozen);
1218         return true;
1219     }
1220 #endif
1221     return false;
1222 }
1223
1224 static int run_agent(GAState *s, GAConfig *config, int socket_activation)
1225 {
1226     ga_state = s;
1227
1228     g_log_set_default_handler(ga_log, s);
1229     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1230     ga_enable_logging(s);
1231
1232 #ifdef _WIN32
1233     /* On win32 the state directory is application specific (be it the default
1234      * or a user override). We got past the command line parsing; let's create
1235      * the directory (with any intermediate directories). If we run into an
1236      * error later on, we won't try to clean up the directory, it is considered
1237      * persistent.
1238      */
1239     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1240         g_critical("unable to create (an ancestor of) the state directory"
1241                    " '%s': %s", config->state_dir, strerror(errno));
1242         return EXIT_FAILURE;
1243     }
1244 #endif
1245
1246     if (ga_is_frozen(s)) {
1247         if (config->daemonize) {
1248             /* delay opening/locking of pidfile till filesystems are unfrozen */
1249             s->deferred_options.pid_filepath = config->pid_filepath;
1250             become_daemon(NULL);
1251         }
1252         if (config->log_filepath) {
1253             /* delay opening the log file till filesystems are unfrozen */
1254             s->deferred_options.log_filepath = config->log_filepath;
1255         }
1256         ga_disable_logging(s);
1257         qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1258     } else {
1259         if (config->daemonize) {
1260             become_daemon(config->pid_filepath);
1261         }
1262         if (config->log_filepath) {
1263             FILE *log_file = ga_open_logfile(config->log_filepath);
1264             if (!log_file) {
1265                 g_critical("unable to open specified log file: %s",
1266                            strerror(errno));
1267                 return EXIT_FAILURE;
1268             }
1269             s->log_file = log_file;
1270         }
1271     }
1272
1273     /* load persistent state from disk */
1274     if (!read_persistent_state(&s->pstate,
1275                                s->pstate_filepath,
1276                                ga_is_frozen(s))) {
1277         g_critical("failed to load persistent state");
1278         return EXIT_FAILURE;
1279     }
1280
1281     config->blacklist = ga_command_blacklist_init(config->blacklist);
1282     if (config->blacklist) {
1283         GList *l = config->blacklist;
1284         s->blacklist = config->blacklist;
1285         do {
1286             g_debug("disabling command: %s", (char *)l->data);
1287             qmp_disable_command(&ga_commands, l->data);
1288             l = g_list_next(l);
1289         } while (l);
1290     }
1291     s->command_state = ga_command_state_new();
1292     ga_command_state_init(s, s->command_state);
1293     ga_command_state_init_all(s->command_state);
1294     json_message_parser_init(&s->parser, process_event);
1295     ga_state = s;
1296 #ifndef _WIN32
1297     if (!register_signal_handlers()) {
1298         g_critical("failed to register signal handlers");
1299         return EXIT_FAILURE;
1300     }
1301 #endif
1302
1303     s->main_loop = g_main_loop_new(NULL, false);
1304
1305     if (!channel_init(ga_state, config->method, config->channel_path,
1306                       socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1307         g_critical("failed to initialize guest agent channel");
1308         return EXIT_FAILURE;
1309     }
1310 #ifndef _WIN32
1311     g_main_loop_run(ga_state->main_loop);
1312 #else
1313     if (config->daemonize) {
1314         SERVICE_TABLE_ENTRY service_table[] = {
1315             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1316         StartServiceCtrlDispatcher(service_table);
1317     } else {
1318         g_main_loop_run(ga_state->main_loop);
1319     }
1320 #endif
1321
1322     return EXIT_SUCCESS;
1323 }
1324
1325 int main(int argc, char **argv)
1326 {
1327     int ret = EXIT_SUCCESS;
1328     GAState *s = g_new0(GAState, 1);
1329     GAConfig *config = g_new0(GAConfig, 1);
1330     int socket_activation;
1331
1332     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1333
1334     qga_qmp_init_marshal(&ga_commands);
1335
1336     init_dfl_pathnames();
1337     config_load(config);
1338     config_parse(config, argc, argv);
1339
1340     if (config->pid_filepath == NULL) {
1341         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1342     }
1343
1344     if (config->state_dir == NULL) {
1345         config->state_dir = g_strdup(dfl_pathnames.state_dir);
1346     }
1347
1348     if (config->method == NULL) {
1349         config->method = g_strdup("virtio-serial");
1350     }
1351
1352     socket_activation = check_socket_activation();
1353     if (socket_activation > 1) {
1354         g_critical("qemu-ga only supports listening on one socket");
1355         ret = EXIT_FAILURE;
1356         goto end;
1357     }
1358     if (socket_activation) {
1359         SocketAddress *addr;
1360
1361         g_free(config->method);
1362         g_free(config->channel_path);
1363         config->method = NULL;
1364         config->channel_path = NULL;
1365
1366         addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1367         if (addr) {
1368             if (addr->type == SOCKET_ADDRESS_KIND_UNIX) {
1369                 config->method = g_strdup("unix-listen");
1370             } else if (addr->type == SOCKET_ADDRESS_KIND_VSOCK) {
1371                 config->method = g_strdup("vsock-listen");
1372             }
1373
1374             qapi_free_SocketAddress(addr);
1375         }
1376
1377         if (!config->method) {
1378             g_critical("unsupported listen fd type");
1379             ret = EXIT_FAILURE;
1380             goto end;
1381         }
1382     } else if (config->channel_path == NULL) {
1383         if (strcmp(config->method, "virtio-serial") == 0) {
1384             /* try the default path for the virtio-serial port */
1385             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1386         } else if (strcmp(config->method, "isa-serial") == 0) {
1387             /* try the default path for the serial port - COM1 */
1388             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1389         } else {
1390             g_critical("must specify a path for this channel");
1391             ret = EXIT_FAILURE;
1392             goto end;
1393         }
1394     }
1395
1396     s->log_level = config->log_level;
1397     s->log_file = stderr;
1398 #ifdef CONFIG_FSFREEZE
1399     s->fsfreeze_hook = config->fsfreeze_hook;
1400 #endif
1401     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1402     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1403                                                  config->state_dir);
1404     s->frozen = check_is_frozen(s);
1405
1406     if (config->dumpconf) {
1407         config_dump(config);
1408         goto end;
1409     }
1410
1411     ret = run_agent(s, config, socket_activation);
1412
1413 end:
1414     if (s->command_state) {
1415         ga_command_state_cleanup_all(s->command_state);
1416         ga_command_state_free(s->command_state);
1417         json_message_parser_destroy(&s->parser);
1418     }
1419     if (s->channel) {
1420         ga_channel_free(s->channel);
1421     }
1422     g_free(s->pstate_filepath);
1423     g_free(s->state_filepath_isfrozen);
1424
1425     if (config->daemonize) {
1426         unlink(config->pid_filepath);
1427     }
1428
1429     config_free(config);
1430     if (s->main_loop) {
1431         g_main_loop_unref(s->main_loop);
1432     }
1433     g_free(s);
1434
1435     return ret;
1436 }