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) {
if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
g_warning("failed to create/open pid file");
}
s->deferred_options.pid_filepath = NULL;
}
/* enable all disabled, non-blacklisted commands */
qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
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);
}
}
struct GuestAgentInfo *qmp_guest_info(Error **errp)
{
GuestAgentInfo *info = g_new0(GuestAgentInfo, 1);
info->version = g_strdup(QEMU_VERSION);
qmp_for_each_command(&ga_commands, qmp_command_info, info);
return info;
}
void ga_set_frozen(GAState *s)
{
if (ga_is_frozen(s)) {
return;
}
/* disable all non-whitelisted (for frozen state) commands */
qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, 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);
}
}
int main(int argc, char **argv)
{
const char *sopt = "hVvdm:p:l:f:F::b:s:t:";
const char *method = NULL, *path = NULL;
const char *log_filepath = NULL;
const char *pid_filepath;
#ifdef CONFIG_FSFREEZE
const char *fsfreeze_hook = NULL;
#endif
const char *state_dir;
#ifdef _WIN32
const char *service = NULL;
#endif
const struct option lopt[] = {
{ "help", 0, NULL, 'h' },
{ "version", 0, NULL, 'V' },
{ "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' },
{ "blacklist", 1, NULL, 'b' },
#ifdef _WIN32
{ "service", 1, NULL, 's' },
#endif
{ "statedir", 1, NULL, 't' },
{ NULL, 0, NULL, 0 }
};
int opt_ind = 0, ch, daemonize = 0, i, j, len;
GLogLevelFlags log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
GList *blacklist = NULL;
GAState *s;
module_call_init(MODULE_INIT_QAPI);
init_dfl_pathnames();
pid_filepath = dfl_pathnames.pidfile;
state_dir = dfl_pathnames.state_dir;
while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
switch (ch) {
case 'm':
method = optarg;
break;
case 'p':
path = optarg;
break;
case 'l':
log_filepath = optarg;
break;
case 'f':
pid_filepath = optarg;
break;
#ifdef CONFIG_FSFREEZE
case 'F':
fsfreeze_hook = optarg ? optarg : QGA_FSFREEZE_HOOK_DEFAULT;
break;
#endif
case 't':
state_dir = optarg;
break;
case 'v':
/* enable all log levels */
log_level = G_LOG_LEVEL_MASK;
break;
case 'V':
printf("QEMU Guest Agent %s\n", QEMU_VERSION);
return 0;
case 'd':
daemonize = 1;
break;
case 'b': {
if (is_help_option(optarg)) {
qmp_for_each_command(ga_print_cmd, NULL);
return 0;
}
for (j = 0, i = 0, len = strlen(optarg); i < len; i++) {
if (optarg[i] == ',') {
optarg[i] = 0;
blacklist = g_list_append(blacklist, &optarg[j]);
j = i + 1;
}
}
if (j < i) {
blacklist = g_list_append(blacklist, &optarg[j]);
}
break;
}
#ifdef _WIN32
case 's':
service = optarg;
if (strcmp(service, "install") == 0) {
const char *fixed_state_dir;
/* If the user passed the "-t" option, we save that state dir
* in the service. Otherwise we let the service fetch the state
* dir from the environment when it starts.
*/
fixed_state_dir = (state_dir == dfl_pathnames.state_dir) ?
NULL :
state_dir;
if (ga_install_vss_provider()) {
return EXIT_FAILURE;
}
if (ga_install_service(path, log_filepath, fixed_state_dir)) {
return EXIT_FAILURE;
}
return 0;
} else if (strcmp(service, "uninstall") == 0) {
ga_uninstall_vss_provider();
return ga_uninstall_service();
} else {
printf("Unknown service command.\n");
return EXIT_FAILURE;
}
break;
#endif
case 'h':
usage(argv[0]);
return 0;
case '?':
g_print("Unknown option, try '%s --help' for more information.\n",
argv[0]);
return EXIT_FAILURE;
}
}
#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(state_dir, S_IRWXU) == -1) {
g_critical("unable to create (an ancestor of) the state directory"
" '%s': %s", state_dir, strerror(errno));
return EXIT_FAILURE;
}
#endif
s = g_malloc0(sizeof(GAState));
s->log_level = log_level;
s->log_file = stderr;
#ifdef CONFIG_FSFREEZE
s->fsfreeze_hook = fsfreeze_hook;
#endif
g_log_set_default_handler(ga_log, s);
g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
ga_enable_logging(s);
s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
state_dir);
s->pstate_filepath = g_strdup_printf("%s/qga.state", state_dir);
s->frozen = false;
#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);
s->frozen = true;
}
#endif
if (ga_is_frozen(s)) {
if (daemonize) {
/* delay opening/locking of pidfile till filesystems are unfrozen */
s->deferred_options.pid_filepath = pid_filepath;
become_daemon(NULL);
}
if (log_filepath) {
/* delay opening the log file till filesystems are unfrozen */
s->deferred_options.log_filepath = log_filepath;
}
ga_disable_logging(s);
qmp_for_each_command(ga_disable_non_whitelisted, NULL);
} else {
if (daemonize) {
become_daemon(pid_filepath);
}
if (log_filepath) {
FILE *log_file = ga_open_logfile(log_filepath);
if (!log_file) {
g_critical("unable to open specified log file: %s",
strerror(errno));
goto out_bad;
}
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");
goto out_bad;
}
blacklist = ga_command_blacklist_init(blacklist);
if (blacklist) {
s->blacklist = blacklist;
do {
g_debug("disabling command: %s", (char *)blacklist->data);
qmp_disable_command(blacklist->data);
blacklist = g_list_next(blacklist);
} while (blacklist);
}
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);
ga_state = s;
#ifndef _WIN32
if (!register_signal_handlers()) {
g_critical("failed to register signal handlers");
goto out_bad;
}
#endif
s->main_loop = g_main_loop_new(NULL, false);
if (!channel_init(ga_state, method, path)) {
g_critical("failed to initialize guest agent channel");
goto out_bad;
}
#ifndef _WIN32
g_main_loop_run(ga_state->main_loop);
#else
if (daemonize) {
SERVICE_TABLE_ENTRY service_table[] = {
{ (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
StartServiceCtrlDispatcher(service_table);
} else {
g_main_loop_run(ga_state->main_loop);
}
#endif
ga_command_state_cleanup_all(ga_state->command_state);
ga_channel_free(ga_state->channel);
if (daemonize) {
unlink(pid_filepath);
}
return 0;
out_bad:
if (daemonize) {
unlink(pid_filepath);
}
return EXIT_FAILURE;
}
