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