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