qemu

main.c (46369B)

---

 /*
  * QEMU Guest Agent
  *
  * Copyright IBM Corp. 2011
  *
  * Authors:
  *  Adam Litke        <aglitke@linux.vnet.ibm.com>
  *  Michael Roth      <mdroth@linux.vnet.ibm.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 
 #include "qemu/osdep.h"
 #include <getopt.h>
 #include <glib/gstdio.h>
 #ifndef _WIN32
 #include <syslog.h>
 #include <sys/wait.h>
 #endif
 #include "qemu/help-texts.h"
 #include "qapi/qmp/json-parser.h"
 #include "qapi/qmp/qdict.h"
 #include "qapi/qmp/qjson.h"
 #include "guest-agent-core.h"
 #include "qga-qapi-init-commands.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/error.h"
 #include "channel.h"
 #include "qemu/cutils.h"
 #include "qemu/help_option.h"
 #include "qemu/sockets.h"
 #include "qemu/systemd.h"
 #include "qemu-version.h"
 #ifdef _WIN32
 #include <dbt.h>
 #include "qga/service-win32.h"
 #include "qga/vss-win32.h"
 #endif
 #include "commands-common.h"
 
 #ifndef _WIN32
 #ifdef __FreeBSD__
 #define QGA_VIRTIO_PATH_DEFAULT "/dev/vtcon/org.qemu.guest_agent.0"
 #else /* __FreeBSD__ */
 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
 #endif /* __FreeBSD__ */
 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
 #define QGA_STATE_RELATIVE_DIR  "run"
 #else
 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
 #define QGA_STATE_RELATIVE_DIR  "qemu-ga"
 #define QGA_SERIAL_PATH_DEFAULT "COM1"
 #endif
 #ifdef CONFIG_FSFREEZE
 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
 #endif
 #define QGA_SENTINEL_BYTE 0xFF
 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
 #define QGA_RETRY_INTERVAL 5
 
 static struct {
     const char *state_dir;
     const char *pidfile;
 } dfl_pathnames;
 
 typedef struct GAPersistentState {
 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
     int64_t fd_counter;
 } GAPersistentState;
 
 typedef struct GAConfig GAConfig;
 
 struct GAState {
     JSONMessageParser parser;
     GMainLoop *main_loop;
     GAChannel *channel;
     bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
     GACommandState *command_state;
     GLogLevelFlags log_level;
     FILE *log_file;
     bool logging_enabled;
 #ifdef _WIN32
     GAService service;
     HANDLE wakeup_event;
 #endif
     bool delimit_response;
     bool frozen;
     GList *blockedrpcs;
     char *state_filepath_isfrozen;
     struct {
         const char *log_filepath;
         const char *pid_filepath;
     } deferred_options;
 #ifdef CONFIG_FSFREEZE
     const char *fsfreeze_hook;
 #endif
     gchar *pstate_filepath;
     GAPersistentState pstate;
     GAConfig *config;
     int socket_activation;
     bool force_exit;
 };
 
 struct GAState *ga_state;
 QmpCommandList ga_commands;
 
 /* commands that are safe to issue while filesystems are frozen */
 static const char *ga_freeze_allowlist[] = {
     "guest-ping",
     "guest-info",
     "guest-sync",
     "guest-sync-delimited",
     "guest-fsfreeze-status",
     "guest-fsfreeze-thaw",
     NULL
 };
 
 #ifdef _WIN32
 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
                                   LPVOID ctx);
 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data);
 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
 #endif
 static int run_agent(GAState *s);
 static void stop_agent(GAState *s, bool requested);
 
 static void
 init_dfl_pathnames(void)
 {
     g_autofree char *state = qemu_get_local_state_dir();
 
     g_assert(dfl_pathnames.state_dir == NULL);
     g_assert(dfl_pathnames.pidfile == NULL);
     dfl_pathnames.state_dir = g_build_filename(state, QGA_STATE_RELATIVE_DIR, NULL);
     dfl_pathnames.pidfile = g_build_filename(state, QGA_STATE_RELATIVE_DIR, "qemu-ga.pid", NULL);
 }
 
 static void quit_handler(int sig)
 {
     /* if we're frozen, don't exit unless we're absolutely forced to,
      * because it's basically impossible for graceful exit to complete
      * unless all log/pid files are on unfreezable filesystems. there's
      * also a very likely chance killing the agent before unfreezing
      * the filesystems is a mistake (or will be viewed as one later).
      * On Windows the freeze interval is limited to 10 seconds, so
      * we should quit, but first we should wait for the timeout, thaw
      * the filesystem and quit.
      */
     if (ga_is_frozen(ga_state)) {
 #ifdef _WIN32
         int i = 0;
         Error *err = NULL;
         HANDLE hEventTimeout;
 
         g_debug("Thawing filesystems before exiting");
 
         hEventTimeout = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_TIMEOUT);
         if (hEventTimeout) {
             WaitForSingleObject(hEventTimeout, 0);
             CloseHandle(hEventTimeout);
         }
         qga_vss_fsfreeze(&i, false, NULL, &err);
         if (err) {
             g_debug("Error unfreezing filesystems prior to exiting: %s",
                 error_get_pretty(err));
             error_free(err);
         }
 #else
         return;
 #endif
     }
     g_debug("received signal num %d, quitting", sig);
 
     stop_agent(ga_state, true);
 }
 
 #ifndef _WIN32
 static gboolean register_signal_handlers(void)
 {
     struct sigaction sigact;
     int ret;
 
     memset(&sigact, 0, sizeof(struct sigaction));
     sigact.sa_handler = quit_handler;
 
     ret = sigaction(SIGINT, &sigact, NULL);
     if (ret == -1) {
         g_error("error configuring signal handler: %s", strerror(errno));
     }
     ret = sigaction(SIGTERM, &sigact, NULL);
     if (ret == -1) {
         g_error("error configuring signal handler: %s", strerror(errno));
     }
 
     sigact.sa_handler = SIG_IGN;
     if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
         g_error("error configuring SIGPIPE signal handler: %s",
                 strerror(errno));
     }
 
     return true;
 }
 
 /* TODO: use this in place of all post-fork() fclose(std*) callers */
 void reopen_fd_to_null(int fd)
 {
     int nullfd;
 
     nullfd = open("/dev/null", O_RDWR);
     if (nullfd < 0) {
         return;
     }
 
     dup2(nullfd, fd);
 
     if (nullfd != fd) {
         close(nullfd);
     }
 }
 #endif
 
 static void usage(const char *cmd)
 {
 #ifdef CONFIG_FSFREEZE
     g_autofree char *fsfreeze_hook = get_relocated_path(QGA_FSFREEZE_HOOK_DEFAULT);
 #endif
 
     printf(
 "Usage: %s [-m <method> -p <path>] [<options>]\n"
 "QEMU Guest Agent " QEMU_FULL_VERSION "\n"
 QEMU_COPYRIGHT "\n"
 "\n"
 "  -m, --method      transport method: one of unix-listen, virtio-serial,\n"
 "                    isa-serial, or vsock-listen (virtio-serial is the default)\n"
 "  -p, --path        device/socket path (the default for virtio-serial is:\n"
 "                    %s,\n"
 "                    the default for isa-serial is:\n"
 "                    %s).\n"
 "                    Socket addresses for vsock-listen are written as\n"
 "                    <cid>:<port>.\n"
 "  -l, --logfile     set logfile path, logs to stderr by default\n"
 "  -f, --pidfile     specify pidfile (default is %s)\n"
 #ifdef CONFIG_FSFREEZE
 "  -F, --fsfreeze-hook\n"
 "                    enable fsfreeze hook. Accepts an optional argument that\n"
 "                    specifies script to run on freeze/thaw. Script will be\n"
 "                    called with 'freeze'/'thaw' arguments accordingly.\n"
 "                    (default is %s)\n"
 "                    If using -F with an argument, do not follow -F with a\n"
 "                    space.\n"
 "                    (for example: -F/var/run/fsfreezehook.sh)\n"
 #endif
 "  -t, --statedir    specify dir to store state information (absolute paths\n"
 "                    only, default is %s)\n"
 "  -v, --verbose     log extra debugging information\n"
 "  -V, --version     print version information and exit\n"
 "  -d, --daemonize   become a daemon\n"
 #ifdef _WIN32
 "  -s, --service     service commands: install, uninstall, vss-install, vss-uninstall\n"
 #endif
 "  -b, --block-rpcs  comma-separated list of RPCs to disable (no spaces,\n"
 "                    use \"help\" to list available RPCs)\n"
 "  -D, --dump-conf   dump a qemu-ga config file based on current config\n"
 "                    options / command-line parameters to stdout\n"
 "  -r, --retry-path  attempt re-opening path if it's unavailable or closed\n"
 "                    due to an error which may be recoverable in the future\n"
 "                    (virtio-serial driver re-install, serial device hot\n"
 "                    plug/unplug, etc.)\n"
 "  -h, --help        display this help and exit\n"
 "\n"
 QEMU_HELP_BOTTOM "\n"
     , cmd, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
     dfl_pathnames.pidfile,
 #ifdef CONFIG_FSFREEZE
     fsfreeze_hook,
 #endif
     dfl_pathnames.state_dir);
 }
 
 static const char *ga_log_level_str(GLogLevelFlags level)
 {
     switch (level & G_LOG_LEVEL_MASK) {
     case G_LOG_LEVEL_ERROR:
         return "error";
     case G_LOG_LEVEL_CRITICAL:
         return "critical";
     case G_LOG_LEVEL_WARNING:
         return "warning";
     case G_LOG_LEVEL_MESSAGE:
         return "message";
     case G_LOG_LEVEL_INFO:
         return "info";
     case G_LOG_LEVEL_DEBUG:
         return "debug";
     default:
         return "user";
     }
 }
 
 bool ga_logging_enabled(GAState *s)
 {
     return s->logging_enabled;
 }
 
 void ga_disable_logging(GAState *s)
 {
     s->logging_enabled = false;
 }
 
 void ga_enable_logging(GAState *s)
 {
     s->logging_enabled = true;
 }
 
 static void ga_log(const gchar *domain, GLogLevelFlags level,
                    const gchar *msg, gpointer opaque)
 {
     GAState *s = opaque;
     const char *level_str = ga_log_level_str(level);
 
     if (!ga_logging_enabled(s)) {
         return;
     }
 
     level &= G_LOG_LEVEL_MASK;
 #ifndef _WIN32
     if (g_strcmp0(domain, "syslog") == 0) {
         syslog(LOG_INFO, "%s: %s", level_str, msg);
     } else if (level & s->log_level) {
 #else
     if (level & s->log_level) {
 #endif
         g_autoptr(GDateTime) now = g_date_time_new_now_utc();
         g_autofree char *nowstr = g_date_time_format(now, "%s.%f");
         fprintf(s->log_file, "%s: %s: %s\n", nowstr, level_str, msg);
         fflush(s->log_file);
     }
 }
 
 void ga_set_response_delimited(GAState *s)
 {
     s->delimit_response = true;
 }
 
 static FILE *ga_open_logfile(const char *logfile)
 {
     FILE *f;
 
     f = fopen(logfile, "a");
     if (!f) {
         return NULL;
     }
 
     qemu_set_cloexec(fileno(f));
     return f;
 }
 
 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
 {
     return strcmp(str1, str2);
 }
 
 /* disable commands that aren't safe for fsfreeze */
 static void ga_disable_not_allowed(const QmpCommand *cmd, void *opaque)
 {
     bool allowed = false;
     int i = 0;
     const char *name = qmp_command_name(cmd);
 
     while (ga_freeze_allowlist[i] != NULL) {
         if (strcmp(name, ga_freeze_allowlist[i]) == 0) {
             allowed = true;
         }
         i++;
     }
     if (!allowed) {
         g_debug("disabling command: %s", name);
         qmp_disable_command(&ga_commands, name, "the agent is in frozen state");
     }
 }
 
 /* [re-]enable all commands, except those explicitly blocked by user */
 static void ga_enable_non_blocked(const QmpCommand *cmd, void *opaque)
 {
     GList *blockedrpcs = opaque;
     const char *name = qmp_command_name(cmd);
 
     if (g_list_find_custom(blockedrpcs, name, ga_strcmp) == NULL &&
         !qmp_command_is_enabled(cmd)) {
         g_debug("enabling command: %s", name);
         qmp_enable_command(&ga_commands, name);
     }
 }
 
 static bool ga_create_file(const char *path)
 {
     int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
     if (fd == -1) {
         g_warning("unable to open/create file %s: %s", path, strerror(errno));
         return false;
     }
     close(fd);
     return true;
 }
 
 static bool ga_delete_file(const char *path)
 {
     int ret = unlink(path);
     if (ret == -1) {
         g_warning("unable to delete file: %s: %s", path, strerror(errno));
         return false;
     }
 
     return true;
 }
 
 bool ga_is_frozen(GAState *s)
 {
     return s->frozen;
 }
 
 void ga_set_frozen(GAState *s)
 {
     if (ga_is_frozen(s)) {
         return;
     }
     /* disable all forbidden (for frozen state) commands */
     qmp_for_each_command(&ga_commands, ga_disable_not_allowed, NULL);
     g_warning("disabling logging due to filesystem freeze");
     ga_disable_logging(s);
     s->frozen = true;
     if (!ga_create_file(s->state_filepath_isfrozen)) {
         g_warning("unable to create %s, fsfreeze may not function properly",
                   s->state_filepath_isfrozen);
     }
 }
 
 void ga_unset_frozen(GAState *s)
 {
     if (!ga_is_frozen(s)) {
         return;
     }
 
     /* if we delayed creation/opening of pid/log files due to being
      * in a frozen state at start up, do it now
      */
     if (s->deferred_options.log_filepath) {
         s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
         if (!s->log_file) {
             s->log_file = stderr;
         }
         s->deferred_options.log_filepath = NULL;
     }
     ga_enable_logging(s);
     g_warning("logging re-enabled due to filesystem unfreeze");
     if (s->deferred_options.pid_filepath) {
         Error *err = NULL;
 
         if (!qemu_write_pidfile(s->deferred_options.pid_filepath, &err)) {
             g_warning("%s", error_get_pretty(err));
             error_free(err);
         }
         s->deferred_options.pid_filepath = NULL;
     }
 
     /* enable all disabled, non-blocked commands */
     qmp_for_each_command(&ga_commands, ga_enable_non_blocked, s->blockedrpcs);
     s->frozen = false;
     if (!ga_delete_file(s->state_filepath_isfrozen)) {
         g_warning("unable to delete %s, fsfreeze may not function properly",
                   s->state_filepath_isfrozen);
     }
 }
 
 #ifdef CONFIG_FSFREEZE
 const char *ga_fsfreeze_hook(GAState *s)
 {
     return s->fsfreeze_hook;
 }
 #endif
 
 static void become_daemon(const char *pidfile)
 {
 #ifndef _WIN32
     pid_t pid, sid;
 
     pid = fork();
     if (pid < 0) {
         exit(EXIT_FAILURE);
     }
     if (pid > 0) {
         exit(EXIT_SUCCESS);
     }
 
     if (pidfile) {
         Error *err = NULL;
 
         if (!qemu_write_pidfile(pidfile, &err)) {
             g_critical("%s", error_get_pretty(err));
             error_free(err);
             exit(EXIT_FAILURE);
         }
     }
 
     umask(S_IRWXG | S_IRWXO);
     sid = setsid();
     if (sid < 0) {
         goto fail;
     }
     if ((chdir("/")) < 0) {
         goto fail;
     }
 
     reopen_fd_to_null(STDIN_FILENO);
     reopen_fd_to_null(STDOUT_FILENO);
     reopen_fd_to_null(STDERR_FILENO);
     return;
 
 fail:
     if (pidfile) {
         unlink(pidfile);
     }
     g_critical("failed to daemonize");
     exit(EXIT_FAILURE);
 #endif
 }
 
 static int send_response(GAState *s, const QDict *rsp)
 {
     GString *response;
     GIOStatus status;
 
     g_assert(s->channel);
 
     if (!rsp) {
         return 0;
     }
 
     response = qobject_to_json(QOBJECT(rsp));
     if (!response) {
         return -EINVAL;
     }
 
     if (s->delimit_response) {
         s->delimit_response = false;
         g_string_prepend_c(response, QGA_SENTINEL_BYTE);
     }
 
     g_string_append_c(response, '\n');
     status = ga_channel_write_all(s->channel, response->str, response->len);
     g_string_free(response, true);
     if (status != G_IO_STATUS_NORMAL) {
         return -EIO;
     }
 
     return 0;
 }
 
 /* handle requests/control events coming in over the channel */
 static void process_event(void *opaque, QObject *obj, Error *err)
 {
     GAState *s = opaque;
     QDict *rsp;
     int ret;
 
     g_debug("process_event: called");
     assert(!obj != !err);
     if (err) {
         rsp = qmp_error_response(err);
         goto end;
     }
 
     g_debug("processing command");
     rsp = qmp_dispatch(&ga_commands, obj, false, NULL);
 
 end:
     ret = send_response(s, rsp);
     if (ret < 0) {
         g_warning("error sending error response: %s", strerror(-ret));
     }
     qobject_unref(rsp);
     qobject_unref(obj);
 }
 
 /* false return signals GAChannel to close the current client connection */
 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
 {
     GAState *s = data;
     gchar buf[QGA_READ_COUNT_DEFAULT + 1];
     gsize count;
     GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
     switch (status) {
     case G_IO_STATUS_ERROR:
         g_warning("error reading channel");
         stop_agent(s, false);
         return false;
     case G_IO_STATUS_NORMAL:
         buf[count] = 0;
         g_debug("read data, count: %d, data: %s", (int)count, buf);
         json_message_parser_feed(&s->parser, (char *)buf, (int)count);
         break;
     case G_IO_STATUS_EOF:
         g_debug("received EOF");
         if (!s->virtio) {
             return false;
         }
         /* fall through */
     case G_IO_STATUS_AGAIN:
         /* virtio causes us to spin here when no process is attached to
          * host-side chardev. sleep a bit to mitigate this
          */
         if (s->virtio) {
             g_usleep(G_USEC_PER_SEC / 10);
         }
         return true;
     default:
         g_warning("unknown channel read status, closing");
         return false;
     }
     return true;
 }
 
 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
                              int listen_fd)
 {
     GAChannelMethod channel_method;
 
     if (strcmp(method, "virtio-serial") == 0) {
         s->virtio = true; /* virtio requires special handling in some cases */
         channel_method = GA_CHANNEL_VIRTIO_SERIAL;
     } else if (strcmp(method, "isa-serial") == 0) {
         channel_method = GA_CHANNEL_ISA_SERIAL;
     } else if (strcmp(method, "unix-listen") == 0) {
         channel_method = GA_CHANNEL_UNIX_LISTEN;
     } else if (strcmp(method, "vsock-listen") == 0) {
         channel_method = GA_CHANNEL_VSOCK_LISTEN;
     } else {
         g_critical("unsupported channel method/type: %s", method);
         return false;
     }
 
     s->channel = ga_channel_new(channel_method, path, listen_fd,
                                 channel_event_cb, s);
     if (!s->channel) {
         g_critical("failed to create guest agent channel");
         return false;
     }
 
     return true;
 }
 
 #ifdef _WIN32
 DWORD WINAPI handle_serial_device_events(DWORD type, LPVOID data)
 {
     DWORD ret = NO_ERROR;
     PDEV_BROADCAST_HDR broadcast_header = (PDEV_BROADCAST_HDR)data;
 
     if (broadcast_header->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
         switch (type) {
             /* Device inserted */
         case DBT_DEVICEARRIVAL:
             /* Start QEMU-ga's service */
             if (!SetEvent(ga_state->wakeup_event)) {
                 ret = GetLastError();
             }
             break;
             /* Device removed */
         case DBT_DEVICEQUERYREMOVE:
         case DBT_DEVICEREMOVEPENDING:
         case DBT_DEVICEREMOVECOMPLETE:
             /* Stop QEMU-ga's service */
             if (!ResetEvent(ga_state->wakeup_event)) {
                 ret = GetLastError();
             }
             break;
         default:
             ret = ERROR_CALL_NOT_IMPLEMENTED;
         }
     }
     return ret;
 }
 
 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
                                   LPVOID ctx)
 {
     DWORD ret = NO_ERROR;
     GAService *service = &ga_state->service;
 
     switch (ctrl) {
     case SERVICE_CONTROL_STOP:
     case SERVICE_CONTROL_SHUTDOWN:
         quit_handler(SIGTERM);
         SetEvent(ga_state->wakeup_event);
         service->status.dwCurrentState = SERVICE_STOP_PENDING;
         SetServiceStatus(service->status_handle, &service->status);
         break;
     case SERVICE_CONTROL_DEVICEEVENT:
         handle_serial_device_events(type, data);
         break;
 
     default:
         ret = ERROR_CALL_NOT_IMPLEMENTED;
     }
     return ret;
 }
 
 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
 {
     GAService *service = &ga_state->service;
 
     service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
         service_ctrl_handler, NULL);
 
     if (service->status_handle == 0) {
         g_critical("Failed to register extended requests function!\n");
         return;
     }
 
     service->status.dwServiceType = SERVICE_WIN32;
     service->status.dwCurrentState = SERVICE_RUNNING;
     service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
     service->status.dwWin32ExitCode = NO_ERROR;
     service->status.dwServiceSpecificExitCode = NO_ERROR;
     service->status.dwCheckPoint = 0;
     service->status.dwWaitHint = 0;
     DEV_BROADCAST_DEVICEINTERFACE notification_filter;
     ZeroMemory(&notification_filter, sizeof(notification_filter));
     notification_filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
     notification_filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
     notification_filter.dbcc_classguid = GUID_VIOSERIAL_PORT;
 
     service->device_notification_handle =
         RegisterDeviceNotification(service->status_handle,
             &notification_filter, DEVICE_NOTIFY_SERVICE_HANDLE);
     if (!service->device_notification_handle) {
         g_critical("Failed to register device notification handle!\n");
         return;
     }
     SetServiceStatus(service->status_handle, &service->status);
 
     run_agent(ga_state);
 
     UnregisterDeviceNotification(service->device_notification_handle);
     service->status.dwCurrentState = SERVICE_STOPPED;
     SetServiceStatus(service->status_handle, &service->status);
 }
 #endif
 
 static void set_persistent_state_defaults(GAPersistentState *pstate)
 {
     g_assert(pstate);
     pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
 }
 
 static void persistent_state_from_keyfile(GAPersistentState *pstate,
                                           GKeyFile *keyfile)
 {
     g_assert(pstate);
     g_assert(keyfile);
     /* if any fields are missing, either because the file was tampered with
      * by agents of chaos, or because the field wasn't present at the time the
      * file was created, the best we can ever do is start over with the default
      * values. so load them now, and ignore any errors in accessing key-value
      * pairs
      */
     set_persistent_state_defaults(pstate);
 
     if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
         pstate->fd_counter =
             g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
     }
 }
 
 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
                                         GKeyFile *keyfile)
 {
     g_assert(pstate);
     g_assert(keyfile);
 
     g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
 }
 
 static gboolean write_persistent_state(const GAPersistentState *pstate,
                                        const gchar *path)
 {
     GKeyFile *keyfile = g_key_file_new();
     GError *gerr = NULL;
     gboolean ret = true;
     gchar *data = NULL;
     gsize data_len;
 
     g_assert(pstate);
 
     persistent_state_to_keyfile(pstate, keyfile);
     data = g_key_file_to_data(keyfile, &data_len, &gerr);
     if (gerr) {
         g_critical("failed to convert persistent state to string: %s",
                    gerr->message);
         ret = false;
         goto out;
     }
 
     g_file_set_contents(path, data, data_len, &gerr);
     if (gerr) {
         g_critical("failed to write persistent state to %s: %s",
                     path, gerr->message);
         ret = false;
         goto out;
     }
 
 out:
     if (gerr) {
         g_error_free(gerr);
     }
     if (keyfile) {
         g_key_file_free(keyfile);
     }
     g_free(data);
     return ret;
 }
 
 static gboolean read_persistent_state(GAPersistentState *pstate,
                                       const gchar *path, gboolean frozen)
 {
     GKeyFile *keyfile = NULL;
     GError *gerr = NULL;
     struct stat st;
     gboolean ret = true;
 
     g_assert(pstate);
 
     if (stat(path, &st) == -1) {
         /* it's okay if state file doesn't exist, but any other error
          * indicates a permissions issue or some other misconfiguration
          * that we likely won't be able to recover from.
          */
         if (errno != ENOENT) {
             g_critical("unable to access state file at path %s: %s",
                        path, strerror(errno));
             ret = false;
             goto out;
         }
 
         /* file doesn't exist. initialize state to default values and
          * attempt to save now. (we could wait till later when we have
          * modified state we need to commit, but if there's a problem,
          * such as a missing parent directory, we want to catch it now)
          *
          * there is a potential scenario where someone either managed to
          * update the agent from a version that didn't use a key store
          * while qemu-ga thought the filesystem was frozen, or
          * deleted the key store prior to issuing a fsfreeze, prior
          * to restarting the agent. in this case we go ahead and defer
          * initial creation till we actually have modified state to
          * write, otherwise fail to recover from freeze.
          */
         set_persistent_state_defaults(pstate);
         if (!frozen) {
             ret = write_persistent_state(pstate, path);
             if (!ret) {
                 g_critical("unable to create state file at path %s", path);
                 ret = false;
                 goto out;
             }
         }
         ret = true;
         goto out;
     }
 
     keyfile = g_key_file_new();
     g_key_file_load_from_file(keyfile, path, 0, &gerr);
     if (gerr) {
         g_critical("error loading persistent state from path: %s, %s",
                    path, gerr->message);
         ret = false;
         goto out;
     }
 
     persistent_state_from_keyfile(pstate, keyfile);
 
 out:
     if (keyfile) {
         g_key_file_free(keyfile);
     }
     if (gerr) {
         g_error_free(gerr);
     }
 
     return ret;
 }
 
 int64_t ga_get_fd_handle(GAState *s, Error **errp)
 {
     int64_t handle;
 
     g_assert(s->pstate_filepath);
     /*
      * We block commands and avoid operations that potentially require
      * writing to disk when we're in a frozen state. this includes opening
      * new files, so we should never get here in that situation
      */
     g_assert(!ga_is_frozen(s));
 
     handle = s->pstate.fd_counter++;
 
     /* This should never happen on a reasonable timeframe, as guest-file-open
      * would have to be issued 2^63 times */
     if (s->pstate.fd_counter == INT64_MAX) {
         abort();
     }
 
     if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
         error_setg(errp, "failed to commit persistent state to disk");
         return -1;
     }
 
     return handle;
 }
 
 static void ga_print_cmd(const QmpCommand *cmd, void *opaque)
 {
     printf("%s\n", qmp_command_name(cmd));
 }
 
 static GList *split_list(const gchar *str, const gchar *delim)
 {
     GList *list = NULL;
     int i;
     gchar **strv;
 
     strv = g_strsplit(str, delim, -1);
     for (i = 0; strv[i]; i++) {
         list = g_list_prepend(list, strv[i]);
     }
     g_free(strv);
 
     return list;
 }
 
 struct GAConfig {
     char *channel_path;
     char *method;
     char *log_filepath;
     char *pid_filepath;
 #ifdef CONFIG_FSFREEZE
     char *fsfreeze_hook;
 #endif
     char *state_dir;
 #ifdef _WIN32
     const char *service;
 #endif
     gchar *bliststr; /* blockedrpcs may point to this string */
     GList *blockedrpcs;
     int daemonize;
     GLogLevelFlags log_level;
     int dumpconf;
     bool retry_path;
 };
 
 static void config_load(GAConfig *config)
 {
     GError *gerr = NULL;
     GKeyFile *keyfile;
     g_autofree char *conf = g_strdup(g_getenv("QGA_CONF")) ?: get_relocated_path(QGA_CONF_DEFAULT);
     const gchar *blockrpcs_key = "block-rpcs";
 
     /* read system config */
     keyfile = g_key_file_new();
     if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
         goto end;
     }
     if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
         config->daemonize =
             g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
     }
     if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
         config->method =
             g_key_file_get_string(keyfile, "general", "method", &gerr);
     }
     if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
         config->channel_path =
             g_key_file_get_string(keyfile, "general", "path", &gerr);
     }
     if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
         config->log_filepath =
             g_key_file_get_string(keyfile, "general", "logfile", &gerr);
     }
     if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
         config->pid_filepath =
             g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
     }
 #ifdef CONFIG_FSFREEZE
     if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
         config->fsfreeze_hook =
             g_key_file_get_string(keyfile,
                                   "general", "fsfreeze-hook", &gerr);
     }
 #endif
     if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
         config->state_dir =
             g_key_file_get_string(keyfile, "general", "statedir", &gerr);
     }
     if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
         g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
         /* enable all log levels */
         config->log_level = G_LOG_LEVEL_MASK;
     }
     if (g_key_file_has_key(keyfile, "general", "retry-path", NULL)) {
         config->retry_path =
             g_key_file_get_boolean(keyfile, "general", "retry-path", &gerr);
     }
 
     if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
         g_warning("config using deprecated 'blacklist' key, should be replaced"
                   " with the 'block-rpcs' key.");
         blockrpcs_key = "blacklist";
     }
     if (g_key_file_has_key(keyfile, "general", blockrpcs_key, NULL)) {
         config->bliststr =
             g_key_file_get_string(keyfile, "general", blockrpcs_key, &gerr);
         config->blockedrpcs = g_list_concat(config->blockedrpcs,
                                           split_list(config->bliststr, ","));
     }
 
 end:
     g_key_file_free(keyfile);
     if (gerr &&
         !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
         g_critical("error loading configuration from path: %s, %s",
                    conf, gerr->message);
         exit(EXIT_FAILURE);
     }
     g_clear_error(&gerr);
 }
 
 static gchar *list_join(GList *list, const gchar separator)
 {
     GString *str = g_string_new("");
 
     while (list) {
         str = g_string_append(str, (gchar *)list->data);
         list = g_list_next(list);
         if (list) {
             str = g_string_append_c(str, separator);
         }
     }
 
     return g_string_free(str, FALSE);
 }
 
 static void config_dump(GAConfig *config)
 {
     GError *error = NULL;
     GKeyFile *keyfile;
     gchar *tmp;
 
     keyfile = g_key_file_new();
     g_assert(keyfile);
 
     g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
     g_key_file_set_string(keyfile, "general", "method", config->method);
     if (config->channel_path) {
         g_key_file_set_string(keyfile, "general", "path", config->channel_path);
     }
     if (config->log_filepath) {
         g_key_file_set_string(keyfile, "general", "logfile",
                               config->log_filepath);
     }
     g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
 #ifdef CONFIG_FSFREEZE
     if (config->fsfreeze_hook) {
         g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
                               config->fsfreeze_hook);
     }
 #endif
     g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
     g_key_file_set_boolean(keyfile, "general", "verbose",
                            config->log_level == G_LOG_LEVEL_MASK);
     g_key_file_set_boolean(keyfile, "general", "retry-path",
                            config->retry_path);
     tmp = list_join(config->blockedrpcs, ',');
     g_key_file_set_string(keyfile, "general", "block-rpcs", tmp);
     g_free(tmp);
 
     tmp = g_key_file_to_data(keyfile, NULL, &error);
     if (error) {
         g_critical("Failed to dump keyfile: %s", error->message);
         g_clear_error(&error);
     } else {
         printf("%s", tmp);
     }
 
     g_free(tmp);
     g_key_file_free(keyfile);
 }
 
 static void config_parse(GAConfig *config, int argc, char **argv)
 {
     const char *sopt = "hVvdm:p:l:f:F::b:s:t:Dr";
     int opt_ind = 0, ch;
     const struct option lopt[] = {
         { "help", 0, NULL, 'h' },
         { "version", 0, NULL, 'V' },
         { "dump-conf", 0, NULL, 'D' },
         { "logfile", 1, NULL, 'l' },
         { "pidfile", 1, NULL, 'f' },
 #ifdef CONFIG_FSFREEZE
         { "fsfreeze-hook", 2, NULL, 'F' },
 #endif
         { "verbose", 0, NULL, 'v' },
         { "method", 1, NULL, 'm' },
         { "path", 1, NULL, 'p' },
         { "daemonize", 0, NULL, 'd' },
         { "block-rpcs", 1, NULL, 'b' },
         { "blacklist", 1, NULL, 'b' },  /* deprecated alias for 'block-rpcs' */
 #ifdef _WIN32
         { "service", 1, NULL, 's' },
 #endif
         { "statedir", 1, NULL, 't' },
         { "retry-path", 0, NULL, 'r' },
         { NULL, 0, NULL, 0 }
     };
 
     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
         switch (ch) {
         case 'm':
             g_free(config->method);
             config->method = g_strdup(optarg);
             break;
         case 'p':
             g_free(config->channel_path);
             config->channel_path = g_strdup(optarg);
             break;
         case 'l':
             g_free(config->log_filepath);
             config->log_filepath = g_strdup(optarg);
             break;
         case 'f':
             g_free(config->pid_filepath);
             config->pid_filepath = g_strdup(optarg);
             break;
 #ifdef CONFIG_FSFREEZE
         case 'F':
             g_free(config->fsfreeze_hook);
             config->fsfreeze_hook = optarg ? g_strdup(optarg) : get_relocated_path(QGA_FSFREEZE_HOOK_DEFAULT);
             break;
 #endif
         case 't':
             g_free(config->state_dir);
             config->state_dir = g_strdup(optarg);
             break;
         case 'v':
             /* enable all log levels */
             config->log_level = G_LOG_LEVEL_MASK;
             break;
         case 'V':
             printf("QEMU Guest Agent %s\n", QEMU_VERSION);
             exit(EXIT_SUCCESS);
         case 'd':
             config->daemonize = 1;
             break;
         case 'D':
             config->dumpconf = 1;
             break;
         case 'r':
             config->retry_path = true;
             break;
         case 'b': {
             if (is_help_option(optarg)) {
                 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
                 exit(EXIT_SUCCESS);
             }
             config->blockedrpcs = g_list_concat(config->blockedrpcs,
                                                 split_list(optarg, ","));
             break;
         }
 #ifdef _WIN32
         case 's':
             config->service = optarg;
             if (strcmp(config->service, "install") == 0) {
                 if (ga_install_vss_provider()) {
                     exit(EXIT_FAILURE);
                 }
                 if (ga_install_service(config->channel_path,
                                        config->log_filepath, config->state_dir)) {
                     exit(EXIT_FAILURE);
                 }
                 exit(EXIT_SUCCESS);
             } else if (strcmp(config->service, "uninstall") == 0) {
                 ga_uninstall_vss_provider();
                 exit(ga_uninstall_service());
             } else if (strcmp(config->service, "vss-install") == 0) {
                 if (ga_install_vss_provider()) {
                     exit(EXIT_FAILURE);
                 }
                 exit(EXIT_SUCCESS);
             } else if (strcmp(config->service, "vss-uninstall") == 0) {
                 ga_uninstall_vss_provider();
                 exit(EXIT_SUCCESS);
             } else {
                 printf("Unknown service command.\n");
                 exit(EXIT_FAILURE);
             }
             break;
 #endif
         case 'h':
             usage(argv[0]);
             exit(EXIT_SUCCESS);
         case '?':
             g_print("Unknown option, try '%s --help' for more information.\n",
                     argv[0]);
             exit(EXIT_FAILURE);
         }
     }
 }
 
 static void config_free(GAConfig *config)
 {
     g_free(config->method);
     g_free(config->log_filepath);
     g_free(config->pid_filepath);
     g_free(config->state_dir);
     g_free(config->channel_path);
     g_free(config->bliststr);
 #ifdef CONFIG_FSFREEZE
     g_free(config->fsfreeze_hook);
 #endif
     g_list_free_full(config->blockedrpcs, g_free);
     g_free(config);
 }
 
 static bool check_is_frozen(GAState *s)
 {
 #ifndef _WIN32
     /* check if a previous instance of qemu-ga exited with filesystems' state
      * marked as frozen. this could be a stale value (a non-qemu-ga process
      * or reboot may have since unfrozen them), but better to require an
      * uneeded unfreeze than to risk hanging on start-up
      */
     struct stat st;
     if (stat(s->state_filepath_isfrozen, &st) == -1) {
         /* it's okay if the file doesn't exist, but if we can't access for
          * some other reason, such as permissions, there's a configuration
          * that needs to be addressed. so just bail now before we get into
          * more trouble later
          */
         if (errno != ENOENT) {
             g_critical("unable to access state file at path %s: %s",
                        s->state_filepath_isfrozen, strerror(errno));
             return EXIT_FAILURE;
         }
     } else {
         g_warning("previous instance appears to have exited with frozen"
                   " filesystems. deferring logging/pidfile creation and"
                   " disabling non-fsfreeze-safe commands until"
                   " guest-fsfreeze-thaw is issued, or filesystems are"
                   " manually unfrozen and the file %s is removed",
                   s->state_filepath_isfrozen);
         return true;
     }
 #endif
     return false;
 }
 
 static GAState *initialize_agent(GAConfig *config, int socket_activation)
 {
     GAState *s = g_new0(GAState, 1);
 
     g_assert(ga_state == NULL);
 
     s->log_level = config->log_level;
     s->log_file = stderr;
 #ifdef CONFIG_FSFREEZE
     s->fsfreeze_hook = config->fsfreeze_hook;
 #endif
     s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
     s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
                                                  config->state_dir);
     s->frozen = check_is_frozen(s);
 
     g_log_set_default_handler(ga_log, s);
     g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
     ga_enable_logging(s);
 
     g_debug("Guest agent version %s started", QEMU_FULL_VERSION);
 
 #ifdef _WIN32
     /* On win32 the state directory is application specific (be it the default
      * or a user override). We got past the command line parsing; let's create
      * the directory (with any intermediate directories). If we run into an
      * error later on, we won't try to clean up the directory, it is considered
      * persistent.
      */
     if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
         g_critical("unable to create (an ancestor of) the state directory"
                    " '%s': %s", config->state_dir, strerror(errno));
         return NULL;
     }
 #endif
 
     if (ga_is_frozen(s)) {
         if (config->daemonize) {
             /* delay opening/locking of pidfile till filesystems are unfrozen */
             s->deferred_options.pid_filepath = config->pid_filepath;
             become_daemon(NULL);
         }
         if (config->log_filepath) {
             /* delay opening the log file till filesystems are unfrozen */
             s->deferred_options.log_filepath = config->log_filepath;
         }
         ga_disable_logging(s);
         qmp_for_each_command(&ga_commands, ga_disable_not_allowed, NULL);
     } else {
         if (config->daemonize) {
             become_daemon(config->pid_filepath);
         }
         if (config->log_filepath) {
             FILE *log_file = ga_open_logfile(config->log_filepath);
             if (!log_file) {
                 g_critical("unable to open specified log file: %s",
                            strerror(errno));
                 return NULL;
             }
             s->log_file = log_file;
         }
     }
 
     /* load persistent state from disk */
     if (!read_persistent_state(&s->pstate,
                                s->pstate_filepath,
                                ga_is_frozen(s))) {
         g_critical("failed to load persistent state");
         return NULL;
     }
 
     config->blockedrpcs = ga_command_init_blockedrpcs(config->blockedrpcs);
     if (config->blockedrpcs) {
         GList *l = config->blockedrpcs;
         s->blockedrpcs = config->blockedrpcs;
         do {
             g_debug("disabling command: %s", (char *)l->data);
             qmp_disable_command(&ga_commands, l->data, NULL);
             l = g_list_next(l);
         } while (l);
     }
     s->command_state = ga_command_state_new();
     ga_command_state_init(s, s->command_state);
     ga_command_state_init_all(s->command_state);
     json_message_parser_init(&s->parser, process_event, s, NULL);
 
 #ifndef _WIN32
     if (!register_signal_handlers()) {
         g_critical("failed to register signal handlers");
         return NULL;
     }
 #endif
 
     s->main_loop = g_main_loop_new(NULL, false);
 
     s->config = config;
     s->socket_activation = socket_activation;
 
 #ifdef _WIN32
     s->wakeup_event = CreateEvent(NULL, TRUE, FALSE, TEXT("WakeUp"));
     if (s->wakeup_event == NULL) {
         g_critical("CreateEvent failed");
         return NULL;
     }
 #endif
 
     ga_state = s;
     return s;
 }
 
 static void cleanup_agent(GAState *s)
 {
 #ifdef _WIN32
     CloseHandle(s->wakeup_event);
 #endif
     if (s->command_state) {
         ga_command_state_cleanup_all(s->command_state);
         ga_command_state_free(s->command_state);
         json_message_parser_destroy(&s->parser);
     }
     g_free(s->pstate_filepath);
     g_free(s->state_filepath_isfrozen);
     if (s->main_loop) {
         g_main_loop_unref(s->main_loop);
     }
     g_free(s);
     ga_state = NULL;
 }
 
 static int run_agent_once(GAState *s)
 {
     if (!channel_init(s, s->config->method, s->config->channel_path,
                       s->socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
         g_critical("failed to initialize guest agent channel");
         return EXIT_FAILURE;
     }
 
     g_main_loop_run(ga_state->main_loop);
 
     if (s->channel) {
         ga_channel_free(s->channel);
     }
 
     return EXIT_SUCCESS;
 }
 
 static void wait_for_channel_availability(GAState *s)
 {
     g_warning("waiting for channel path...");
 #ifndef _WIN32
     sleep(QGA_RETRY_INTERVAL);
 #else
     DWORD dwWaitResult;
 
     dwWaitResult = WaitForSingleObject(s->wakeup_event, INFINITE);
 
     switch (dwWaitResult) {
     case WAIT_OBJECT_0:
         break;
     case WAIT_TIMEOUT:
         break;
     default:
         g_critical("WaitForSingleObject failed");
     }
 #endif
 }
 
 static int run_agent(GAState *s)
 {
     int ret = EXIT_SUCCESS;
 
     s->force_exit = false;
 
     do {
         ret = run_agent_once(s);
         if (s->config->retry_path && !s->force_exit) {
             g_warning("agent stopped unexpectedly, restarting...");
             wait_for_channel_availability(s);
         }
     } while (s->config->retry_path && !s->force_exit);
 
     return ret;
 }
 
 static void stop_agent(GAState *s, bool requested)
 {
     if (!s->force_exit) {
         s->force_exit = requested;
     }
 
     if (g_main_loop_is_running(s->main_loop)) {
         g_main_loop_quit(s->main_loop);
     }
 }
 
 int main(int argc, char **argv)
 {
     int ret = EXIT_SUCCESS;
     GAState *s;
     GAConfig *config = g_new0(GAConfig, 1);
     int socket_activation;
 
     config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
 
     qemu_init_exec_dir(argv[0]);
     qga_qmp_init_marshal(&ga_commands);
 
     init_dfl_pathnames();
     config_load(config);
     config_parse(config, argc, argv);
 
     if (config->pid_filepath == NULL) {
         config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
     }
 
     if (config->state_dir == NULL) {
         config->state_dir = g_strdup(dfl_pathnames.state_dir);
     }
 
     if (config->method == NULL) {
         config->method = g_strdup("virtio-serial");
     }
 
     socket_activation = check_socket_activation();
     if (socket_activation > 1) {
         g_critical("qemu-ga only supports listening on one socket");
         ret = EXIT_FAILURE;
         goto end;
     }
     if (socket_activation) {
         SocketAddress *addr;
 
         g_free(config->method);
         g_free(config->channel_path);
         config->method = NULL;
         config->channel_path = NULL;
 
         addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
         if (addr) {
             if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
                 config->method = g_strdup("unix-listen");
             } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
                 config->method = g_strdup("vsock-listen");
             }
 
             qapi_free_SocketAddress(addr);
         }
 
         if (!config->method) {
             g_critical("unsupported listen fd type");
             ret = EXIT_FAILURE;
             goto end;
         }
     } else if (config->channel_path == NULL) {
         if (strcmp(config->method, "virtio-serial") == 0) {
             /* try the default path for the virtio-serial port */
             config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
         } else if (strcmp(config->method, "isa-serial") == 0) {
             /* try the default path for the serial port - COM1 */
             config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
         } else {
             g_critical("must specify a path for this channel");
             ret = EXIT_FAILURE;
             goto end;
         }
     }
 
     if (config->dumpconf) {
         config_dump(config);
         goto end;
     }
 
     s = initialize_agent(config, socket_activation);
     if (!s) {
         g_critical("error initializing guest agent");
         goto end;
     }
 
 #ifdef _WIN32
     if (config->daemonize) {
         SERVICE_TABLE_ENTRY service_table[] = {
             { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
         StartServiceCtrlDispatcher(service_table);
     } else {
         ret = run_agent(s);
     }
 #else
     ret = run_agent(s);
 #endif
 
     cleanup_agent(s);
 
 end:
     if (config->daemonize) {
         unlink(config->pid_filepath);
     }
 
     config_free(config);
 
     return ret;
 }