4 * Copyright IBM Corp. 2011
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.
18 #include <glib/gstdio.h>
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"
31 #include "qapi/qmp/qerror.h"
32 #include "qapi/qmp/dispatch.h"
33 #include "qga/channel.h"
34 #include "qemu/bswap.h"
36 #include "qga/service-win32.h"
37 #include "qga/vss-win32.h"
42 #define CONFIG_FSFREEZE
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"
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"
55 #ifdef CONFIG_FSFREEZE
56 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
58 #define QGA_SENTINEL_BYTE 0xFF
59 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
62 const char *state_dir;
66 typedef struct GAPersistentState {
67 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
72 JSONMessageParser parser;
75 bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
76 GACommandState *command_state;
77 GLogLevelFlags log_level;
83 bool delimit_response;
86 char *state_filepath_isfrozen;
88 const char *log_filepath;
89 const char *pid_filepath;
91 #ifdef CONFIG_FSFREEZE
92 const char *fsfreeze_hook;
94 gchar *pstate_filepath;
95 GAPersistentState pstate;
98 struct GAState *ga_state;
100 /* commands that are safe to issue while filesystems are frozen */
101 static const char *ga_freeze_whitelist[] = {
105 "guest-sync-delimited",
106 "guest-fsfreeze-status",
107 "guest-fsfreeze-thaw",
112 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
114 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
118 init_dfl_pathnames(void)
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");
128 static void quit_handler(int sig)
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).
136 if (ga_is_frozen(ga_state)) {
139 g_debug("received signal num %d, quitting", sig);
141 if (g_main_loop_is_running(ga_state->main_loop)) {
142 g_main_loop_quit(ga_state->main_loop);
147 static gboolean register_signal_handlers(void)
149 struct sigaction sigact;
152 memset(&sigact, 0, sizeof(struct sigaction));
153 sigact.sa_handler = quit_handler;
155 ret = sigaction(SIGINT, &sigact, NULL);
157 g_error("error configuring signal handler: %s", strerror(errno));
159 ret = sigaction(SIGTERM, &sigact, NULL);
161 g_error("error configuring signal handler: %s", strerror(errno));
164 sigact.sa_handler = SIG_IGN;
165 if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
166 g_error("error configuring SIGPIPE signal handler: %s",
173 /* TODO: use this in place of all post-fork() fclose(std*) callers */
174 void reopen_fd_to_null(int fd)
178 nullfd = open("/dev/null", O_RDWR);
191 static void usage(const char *cmd)
194 "Usage: %s [-m <method> -p <path>] [<options>]\n"
195 "QEMU Guest Agent %s\n"
197 " -m, --method transport method: one of unix-listen, virtio-serial, or\n"
198 " isa-serial (virtio-serial is the default)\n"
199 " -p, --path device/socket path (the default for virtio-serial is:\n"
201 " the default for isa-serial is:\n"
203 " -l, --logfile set logfile path, logs to stderr by default\n"
204 " -f, --pidfile specify pidfile (default is %s)\n"
205 #ifdef CONFIG_FSFREEZE
206 " -F, --fsfreeze-hook\n"
207 " enable fsfreeze hook. Accepts an optional argument that\n"
208 " specifies script to run on freeze/thaw. Script will be\n"
209 " called with 'freeze'/'thaw' arguments accordingly.\n"
211 " If using -F with an argument, do not follow -F with a\n"
213 " (for example: -F/var/run/fsfreezehook.sh)\n"
215 " -t, --statedir specify dir to store state information (absolute paths\n"
216 " only, default is %s)\n"
217 " -v, --verbose log extra debugging information\n"
218 " -V, --version print version information and exit\n"
219 " -d, --daemonize become a daemon\n"
221 " -s, --service service commands: install, uninstall, vss-install, vss-uninstall\n"
223 " -b, --blacklist comma-separated list of RPCs to disable (no spaces, \"?\"\n"
224 " to list available RPCs)\n"
225 " -D, --dump-conf dump a qemu-ga config file based on current config\n"
226 " options / command-line parameters to stdout\n"
227 " -h, --help display this help and exit\n"
230 , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
231 dfl_pathnames.pidfile,
232 #ifdef CONFIG_FSFREEZE
233 QGA_FSFREEZE_HOOK_DEFAULT,
235 dfl_pathnames.state_dir);
238 static const char *ga_log_level_str(GLogLevelFlags level)
240 switch (level & G_LOG_LEVEL_MASK) {
241 case G_LOG_LEVEL_ERROR:
243 case G_LOG_LEVEL_CRITICAL:
245 case G_LOG_LEVEL_WARNING:
247 case G_LOG_LEVEL_MESSAGE:
249 case G_LOG_LEVEL_INFO:
251 case G_LOG_LEVEL_DEBUG:
258 bool ga_logging_enabled(GAState *s)
260 return s->logging_enabled;
263 void ga_disable_logging(GAState *s)
265 s->logging_enabled = false;
268 void ga_enable_logging(GAState *s)
270 s->logging_enabled = true;
273 static void ga_log(const gchar *domain, GLogLevelFlags level,
274 const gchar *msg, gpointer opaque)
278 const char *level_str = ga_log_level_str(level);
280 if (!ga_logging_enabled(s)) {
284 level &= G_LOG_LEVEL_MASK;
286 if (g_strcmp0(domain, "syslog") == 0) {
287 syslog(LOG_INFO, "%s: %s", level_str, msg);
288 } else if (level & s->log_level) {
290 if (level & s->log_level) {
292 g_get_current_time(&time);
294 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
299 void ga_set_response_delimited(GAState *s)
301 s->delimit_response = true;
304 static FILE *ga_open_logfile(const char *logfile)
308 f = fopen(logfile, "a");
313 qemu_set_cloexec(fileno(f));
318 static bool ga_open_pidfile(const char *pidfile)
323 pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
324 if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
325 g_critical("Cannot lock pid file, %s", strerror(errno));
332 if (ftruncate(pidfd, 0)) {
333 g_critical("Failed to truncate pid file");
336 snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
337 if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
338 g_critical("Failed to write pid file");
342 /* keep pidfile open & locked forever */
351 static bool ga_open_pidfile(const char *pidfile)
357 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
359 return strcmp(str1, str2);
362 /* disable commands that aren't safe for fsfreeze */
363 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
365 bool whitelisted = false;
367 const char *name = qmp_command_name(cmd);
369 while (ga_freeze_whitelist[i] != NULL) {
370 if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
376 g_debug("disabling command: %s", name);
377 qmp_disable_command(name);
381 /* [re-]enable all commands, except those explicitly blacklisted by user */
382 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
384 GList *blacklist = opaque;
385 const char *name = qmp_command_name(cmd);
387 if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
388 !qmp_command_is_enabled(cmd)) {
389 g_debug("enabling command: %s", name);
390 qmp_enable_command(name);
394 static bool ga_create_file(const char *path)
396 int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
398 g_warning("unable to open/create file %s: %s", path, strerror(errno));
405 static bool ga_delete_file(const char *path)
407 int ret = unlink(path);
409 g_warning("unable to delete file: %s: %s", path, strerror(errno));
416 bool ga_is_frozen(GAState *s)
421 void ga_set_frozen(GAState *s)
423 if (ga_is_frozen(s)) {
426 /* disable all non-whitelisted (for frozen state) commands */
427 qmp_for_each_command(ga_disable_non_whitelisted, NULL);
428 g_warning("disabling logging due to filesystem freeze");
429 ga_disable_logging(s);
431 if (!ga_create_file(s->state_filepath_isfrozen)) {
432 g_warning("unable to create %s, fsfreeze may not function properly",
433 s->state_filepath_isfrozen);
437 void ga_unset_frozen(GAState *s)
439 if (!ga_is_frozen(s)) {
443 /* if we delayed creation/opening of pid/log files due to being
444 * in a frozen state at start up, do it now
446 if (s->deferred_options.log_filepath) {
447 s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
449 s->log_file = stderr;
451 s->deferred_options.log_filepath = NULL;
453 ga_enable_logging(s);
454 g_warning("logging re-enabled due to filesystem unfreeze");
455 if (s->deferred_options.pid_filepath) {
456 if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
457 g_warning("failed to create/open pid file");
459 s->deferred_options.pid_filepath = NULL;
462 /* enable all disabled, non-blacklisted commands */
463 qmp_for_each_command(ga_enable_non_blacklisted, s->blacklist);
465 if (!ga_delete_file(s->state_filepath_isfrozen)) {
466 g_warning("unable to delete %s, fsfreeze may not function properly",
467 s->state_filepath_isfrozen);
471 #ifdef CONFIG_FSFREEZE
472 const char *ga_fsfreeze_hook(GAState *s)
474 return s->fsfreeze_hook;
478 static void become_daemon(const char *pidfile)
492 if (!ga_open_pidfile(pidfile)) {
493 g_critical("failed to create pidfile");
498 umask(S_IRWXG | S_IRWXO);
503 if ((chdir("/")) < 0) {
507 reopen_fd_to_null(STDIN_FILENO);
508 reopen_fd_to_null(STDOUT_FILENO);
509 reopen_fd_to_null(STDERR_FILENO);
516 g_critical("failed to daemonize");
521 static int send_response(GAState *s, QObject *payload)
524 QString *payload_qstr, *response_qstr;
527 g_assert(payload && s->channel);
529 payload_qstr = qobject_to_json(payload);
534 if (s->delimit_response) {
535 s->delimit_response = false;
536 response_qstr = qstring_new();
537 qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
538 qstring_append(response_qstr, qstring_get_str(payload_qstr));
539 QDECREF(payload_qstr);
541 response_qstr = payload_qstr;
544 qstring_append_chr(response_qstr, '\n');
545 buf = qstring_get_str(response_qstr);
546 status = ga_channel_write_all(s->channel, buf, strlen(buf));
547 QDECREF(response_qstr);
548 if (status != G_IO_STATUS_NORMAL) {
555 static void process_command(GAState *s, QDict *req)
561 g_debug("processing command");
562 rsp = qmp_dispatch(QOBJECT(req));
564 ret = send_response(s, rsp);
566 g_warning("error sending response: %s", strerror(ret));
572 /* handle requests/control events coming in over the channel */
573 static void process_event(JSONMessageParser *parser, QList *tokens)
575 GAState *s = container_of(parser, GAState, parser);
581 g_assert(s && parser);
583 g_debug("process_event: called");
584 obj = json_parser_parse_err(tokens, NULL, &err);
585 if (err || !obj || qobject_type(obj) != QTYPE_QDICT) {
589 g_warning("failed to parse event: unknown error");
590 error_setg(&err, QERR_JSON_PARSING);
592 g_warning("failed to parse event: %s", error_get_pretty(err));
594 qdict_put_obj(qdict, "error", qmp_build_error_object(err));
597 qdict = qobject_to_qdict(obj);
602 /* handle host->guest commands */
603 if (qdict_haskey(qdict, "execute")) {
604 process_command(s, qdict);
606 if (!qdict_haskey(qdict, "error")) {
609 g_warning("unrecognized payload format");
610 error_setg(&err, QERR_UNSUPPORTED);
611 qdict_put_obj(qdict, "error", qmp_build_error_object(err));
614 ret = send_response(s, QOBJECT(qdict));
616 g_warning("error sending error response: %s", strerror(-ret));
623 /* false return signals GAChannel to close the current client connection */
624 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
627 gchar buf[QGA_READ_COUNT_DEFAULT+1];
630 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
632 g_warning("error reading channel: %s", err->message);
637 case G_IO_STATUS_ERROR:
638 g_warning("error reading channel");
640 case G_IO_STATUS_NORMAL:
642 g_debug("read data, count: %d, data: %s", (int)count, buf);
643 json_message_parser_feed(&s->parser, (char *)buf, (int)count);
645 case G_IO_STATUS_EOF:
646 g_debug("received EOF");
651 case G_IO_STATUS_AGAIN:
652 /* virtio causes us to spin here when no process is attached to
653 * host-side chardev. sleep a bit to mitigate this
660 g_warning("unknown channel read status, closing");
666 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
668 GAChannelMethod channel_method;
670 if (strcmp(method, "virtio-serial") == 0) {
671 s->virtio = true; /* virtio requires special handling in some cases */
672 channel_method = GA_CHANNEL_VIRTIO_SERIAL;
673 } else if (strcmp(method, "isa-serial") == 0) {
674 channel_method = GA_CHANNEL_ISA_SERIAL;
675 } else if (strcmp(method, "unix-listen") == 0) {
676 channel_method = GA_CHANNEL_UNIX_LISTEN;
678 g_critical("unsupported channel method/type: %s", method);
682 s->channel = ga_channel_new(channel_method, path, channel_event_cb, s);
684 g_critical("failed to create guest agent channel");
692 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
695 DWORD ret = NO_ERROR;
696 GAService *service = &ga_state->service;
700 case SERVICE_CONTROL_STOP:
701 case SERVICE_CONTROL_SHUTDOWN:
702 quit_handler(SIGTERM);
703 service->status.dwCurrentState = SERVICE_STOP_PENDING;
704 SetServiceStatus(service->status_handle, &service->status);
708 ret = ERROR_CALL_NOT_IMPLEMENTED;
713 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
715 GAService *service = &ga_state->service;
717 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
718 service_ctrl_handler, NULL);
720 if (service->status_handle == 0) {
721 g_critical("Failed to register extended requests function!\n");
725 service->status.dwServiceType = SERVICE_WIN32;
726 service->status.dwCurrentState = SERVICE_RUNNING;
727 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
728 service->status.dwWin32ExitCode = NO_ERROR;
729 service->status.dwServiceSpecificExitCode = NO_ERROR;
730 service->status.dwCheckPoint = 0;
731 service->status.dwWaitHint = 0;
732 SetServiceStatus(service->status_handle, &service->status);
734 g_main_loop_run(ga_state->main_loop);
736 service->status.dwCurrentState = SERVICE_STOPPED;
737 SetServiceStatus(service->status_handle, &service->status);
741 static void set_persistent_state_defaults(GAPersistentState *pstate)
744 pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
747 static void persistent_state_from_keyfile(GAPersistentState *pstate,
752 /* if any fields are missing, either because the file was tampered with
753 * by agents of chaos, or because the field wasn't present at the time the
754 * file was created, the best we can ever do is start over with the default
755 * values. so load them now, and ignore any errors in accessing key-value
758 set_persistent_state_defaults(pstate);
760 if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
762 g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
766 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
772 g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
775 static gboolean write_persistent_state(const GAPersistentState *pstate,
778 GKeyFile *keyfile = g_key_file_new();
786 persistent_state_to_keyfile(pstate, keyfile);
787 data = g_key_file_to_data(keyfile, &data_len, &gerr);
789 g_critical("failed to convert persistent state to string: %s",
795 g_file_set_contents(path, data, data_len, &gerr);
797 g_critical("failed to write persistent state to %s: %s",
798 path, gerr->message);
808 g_key_file_free(keyfile);
814 static gboolean read_persistent_state(GAPersistentState *pstate,
815 const gchar *path, gboolean frozen)
817 GKeyFile *keyfile = NULL;
824 if (stat(path, &st) == -1) {
825 /* it's okay if state file doesn't exist, but any other error
826 * indicates a permissions issue or some other misconfiguration
827 * that we likely won't be able to recover from.
829 if (errno != ENOENT) {
830 g_critical("unable to access state file at path %s: %s",
831 path, strerror(errno));
836 /* file doesn't exist. initialize state to default values and
837 * attempt to save now. (we could wait till later when we have
838 * modified state we need to commit, but if there's a problem,
839 * such as a missing parent directory, we want to catch it now)
841 * there is a potential scenario where someone either managed to
842 * update the agent from a version that didn't use a key store
843 * while qemu-ga thought the filesystem was frozen, or
844 * deleted the key store prior to issuing a fsfreeze, prior
845 * to restarting the agent. in this case we go ahead and defer
846 * initial creation till we actually have modified state to
847 * write, otherwise fail to recover from freeze.
849 set_persistent_state_defaults(pstate);
851 ret = write_persistent_state(pstate, path);
853 g_critical("unable to create state file at path %s", path);
862 keyfile = g_key_file_new();
863 g_key_file_load_from_file(keyfile, path, 0, &gerr);
865 g_critical("error loading persistent state from path: %s, %s",
866 path, gerr->message);
871 persistent_state_from_keyfile(pstate, keyfile);
875 g_key_file_free(keyfile);
884 int64_t ga_get_fd_handle(GAState *s, Error **errp)
888 g_assert(s->pstate_filepath);
889 /* we blacklist commands and avoid operations that potentially require
890 * writing to disk when we're in a frozen state. this includes opening
891 * new files, so we should never get here in that situation
893 g_assert(!ga_is_frozen(s));
895 handle = s->pstate.fd_counter++;
897 /* This should never happen on a reasonable timeframe, as guest-file-open
898 * would have to be issued 2^63 times */
899 if (s->pstate.fd_counter == INT64_MAX) {
903 if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
904 error_setg(errp, "failed to commit persistent state to disk");
911 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
913 printf("%s\n", qmp_command_name(cmd));
916 static GList *split_list(const gchar *str, const gchar *delim)
922 strv = g_strsplit(str, delim, -1);
923 for (i = 0; strv[i]; i++) {
924 list = g_list_prepend(list, strv[i]);
931 typedef struct GAConfig {
936 #ifdef CONFIG_FSFREEZE
943 gchar *bliststr; /* blacklist may point to this string */
946 GLogLevelFlags log_level;
950 static void config_load(GAConfig *config)
954 const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
956 /* read system config */
957 keyfile = g_key_file_new();
958 if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
961 if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
963 g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
965 if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
967 g_key_file_get_string(keyfile, "general", "method", &gerr);
969 if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
970 config->channel_path =
971 g_key_file_get_string(keyfile, "general", "path", &gerr);
973 if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
974 config->log_filepath =
975 g_key_file_get_string(keyfile, "general", "logfile", &gerr);
977 if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
978 config->pid_filepath =
979 g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
981 #ifdef CONFIG_FSFREEZE
982 if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
983 config->fsfreeze_hook =
984 g_key_file_get_string(keyfile,
985 "general", "fsfreeze-hook", &gerr);
988 if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
990 g_key_file_get_string(keyfile, "general", "statedir", &gerr);
992 if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
993 g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
994 /* enable all log levels */
995 config->log_level = G_LOG_LEVEL_MASK;
997 if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
999 g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1000 config->blacklist = g_list_concat(config->blacklist,
1001 split_list(config->bliststr, ","));
1005 g_key_file_free(keyfile);
1007 !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1008 g_critical("error loading configuration from path: %s, %s",
1009 QGA_CONF_DEFAULT, gerr->message);
1012 g_clear_error(&gerr);
1015 static gchar *list_join(GList *list, const gchar separator)
1017 GString *str = g_string_new("");
1020 str = g_string_append(str, (gchar *)list->data);
1021 list = g_list_next(list);
1023 str = g_string_append_c(str, separator);
1027 return g_string_free(str, FALSE);
1030 static void config_dump(GAConfig *config)
1032 GError *error = NULL;
1036 keyfile = g_key_file_new();
1039 g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1040 g_key_file_set_string(keyfile, "general", "method", config->method);
1041 g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1042 if (config->log_filepath) {
1043 g_key_file_set_string(keyfile, "general", "logfile",
1044 config->log_filepath);
1046 g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1047 #ifdef CONFIG_FSFREEZE
1048 if (config->fsfreeze_hook) {
1049 g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1050 config->fsfreeze_hook);
1053 g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1054 g_key_file_set_boolean(keyfile, "general", "verbose",
1055 config->log_level == G_LOG_LEVEL_MASK);
1056 tmp = list_join(config->blacklist, ',');
1057 g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1060 tmp = g_key_file_to_data(keyfile, NULL, &error);
1064 g_key_file_free(keyfile);
1067 static void config_parse(GAConfig *config, int argc, char **argv)
1069 const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1070 int opt_ind = 0, ch;
1071 const struct option lopt[] = {
1072 { "help", 0, NULL, 'h' },
1073 { "version", 0, NULL, 'V' },
1074 { "dump-conf", 0, NULL, 'D' },
1075 { "logfile", 1, NULL, 'l' },
1076 { "pidfile", 1, NULL, 'f' },
1077 #ifdef CONFIG_FSFREEZE
1078 { "fsfreeze-hook", 2, NULL, 'F' },
1080 { "verbose", 0, NULL, 'v' },
1081 { "method", 1, NULL, 'm' },
1082 { "path", 1, NULL, 'p' },
1083 { "daemonize", 0, NULL, 'd' },
1084 { "blacklist", 1, NULL, 'b' },
1086 { "service", 1, NULL, 's' },
1088 { "statedir", 1, NULL, 't' },
1089 { NULL, 0, NULL, 0 }
1092 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1095 g_free(config->method);
1096 config->method = g_strdup(optarg);
1099 g_free(config->channel_path);
1100 config->channel_path = g_strdup(optarg);
1103 g_free(config->log_filepath);
1104 config->log_filepath = g_strdup(optarg);
1107 g_free(config->pid_filepath);
1108 config->pid_filepath = g_strdup(optarg);
1110 #ifdef CONFIG_FSFREEZE
1112 g_free(config->fsfreeze_hook);
1113 config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1117 g_free(config->state_dir);
1118 config->state_dir = g_strdup(optarg);
1121 /* enable all log levels */
1122 config->log_level = G_LOG_LEVEL_MASK;
1125 printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1128 config->daemonize = 1;
1131 config->dumpconf = 1;
1134 if (is_help_option(optarg)) {
1135 qmp_for_each_command(ga_print_cmd, NULL);
1138 config->blacklist = g_list_concat(config->blacklist,
1139 split_list(optarg, ","));
1144 config->service = optarg;
1145 if (strcmp(config->service, "install") == 0) {
1146 if (ga_install_vss_provider()) {
1149 if (ga_install_service(config->channel_path,
1150 config->log_filepath, config->state_dir)) {
1154 } else if (strcmp(config->service, "uninstall") == 0) {
1155 ga_uninstall_vss_provider();
1156 exit(ga_uninstall_service());
1157 } else if (strcmp(config->service, "vss-install") == 0) {
1158 if (ga_install_vss_provider()) {
1162 } else if (strcmp(config->service, "vss-uninstall") == 0) {
1163 ga_uninstall_vss_provider();
1166 printf("Unknown service command.\n");
1175 g_print("Unknown option, try '%s --help' for more information.\n",
1182 static void config_free(GAConfig *config)
1184 g_free(config->method);
1185 g_free(config->log_filepath);
1186 g_free(config->pid_filepath);
1187 g_free(config->state_dir);
1188 g_free(config->channel_path);
1189 g_free(config->bliststr);
1190 #ifdef CONFIG_FSFREEZE
1191 g_free(config->fsfreeze_hook);
1196 static bool check_is_frozen(GAState *s)
1199 /* check if a previous instance of qemu-ga exited with filesystems' state
1200 * marked as frozen. this could be a stale value (a non-qemu-ga process
1201 * or reboot may have since unfrozen them), but better to require an
1202 * uneeded unfreeze than to risk hanging on start-up
1205 if (stat(s->state_filepath_isfrozen, &st) == -1) {
1206 /* it's okay if the file doesn't exist, but if we can't access for
1207 * some other reason, such as permissions, there's a configuration
1208 * that needs to be addressed. so just bail now before we get into
1209 * more trouble later
1211 if (errno != ENOENT) {
1212 g_critical("unable to access state file at path %s: %s",
1213 s->state_filepath_isfrozen, strerror(errno));
1214 return EXIT_FAILURE;
1217 g_warning("previous instance appears to have exited with frozen"
1218 " filesystems. deferring logging/pidfile creation and"
1219 " disabling non-fsfreeze-safe commands until"
1220 " guest-fsfreeze-thaw is issued, or filesystems are"
1221 " manually unfrozen and the file %s is removed",
1222 s->state_filepath_isfrozen);
1229 static int run_agent(GAState *s, GAConfig *config)
1233 g_log_set_default_handler(ga_log, s);
1234 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1235 ga_enable_logging(s);
1238 /* On win32 the state directory is application specific (be it the default
1239 * or a user override). We got past the command line parsing; let's create
1240 * the directory (with any intermediate directories). If we run into an
1241 * error later on, we won't try to clean up the directory, it is considered
1244 if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1245 g_critical("unable to create (an ancestor of) the state directory"
1246 " '%s': %s", config->state_dir, strerror(errno));
1247 return EXIT_FAILURE;
1251 if (ga_is_frozen(s)) {
1252 if (config->daemonize) {
1253 /* delay opening/locking of pidfile till filesystems are unfrozen */
1254 s->deferred_options.pid_filepath = config->pid_filepath;
1255 become_daemon(NULL);
1257 if (config->log_filepath) {
1258 /* delay opening the log file till filesystems are unfrozen */
1259 s->deferred_options.log_filepath = config->log_filepath;
1261 ga_disable_logging(s);
1262 qmp_for_each_command(ga_disable_non_whitelisted, NULL);
1264 if (config->daemonize) {
1265 become_daemon(config->pid_filepath);
1267 if (config->log_filepath) {
1268 FILE *log_file = ga_open_logfile(config->log_filepath);
1270 g_critical("unable to open specified log file: %s",
1272 return EXIT_FAILURE;
1274 s->log_file = log_file;
1278 /* load persistent state from disk */
1279 if (!read_persistent_state(&s->pstate,
1282 g_critical("failed to load persistent state");
1283 return EXIT_FAILURE;
1286 config->blacklist = ga_command_blacklist_init(config->blacklist);
1287 if (config->blacklist) {
1288 GList *l = config->blacklist;
1289 s->blacklist = config->blacklist;
1291 g_debug("disabling command: %s", (char *)l->data);
1292 qmp_disable_command(l->data);
1296 s->command_state = ga_command_state_new();
1297 ga_command_state_init(s, s->command_state);
1298 ga_command_state_init_all(s->command_state);
1299 json_message_parser_init(&s->parser, process_event);
1302 if (!register_signal_handlers()) {
1303 g_critical("failed to register signal handlers");
1304 return EXIT_FAILURE;
1308 s->main_loop = g_main_loop_new(NULL, false);
1309 if (!channel_init(ga_state, config->method, config->channel_path)) {
1310 g_critical("failed to initialize guest agent channel");
1311 return EXIT_FAILURE;
1314 g_main_loop_run(ga_state->main_loop);
1316 if (config->daemonize) {
1317 SERVICE_TABLE_ENTRY service_table[] = {
1318 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1319 StartServiceCtrlDispatcher(service_table);
1321 g_main_loop_run(ga_state->main_loop);
1325 return EXIT_SUCCESS;
1328 static void free_blacklist_entry(gpointer entry, gpointer unused)
1333 int main(int argc, char **argv)
1335 int ret = EXIT_SUCCESS;
1336 GAState *s = g_new0(GAState, 1);
1337 GAConfig *config = g_new0(GAConfig, 1);
1339 config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1341 module_call_init(MODULE_INIT_QAPI);
1343 init_dfl_pathnames();
1344 config_load(config);
1345 config_parse(config, argc, argv);
1347 if (config->pid_filepath == NULL) {
1348 config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1351 if (config->state_dir == NULL) {
1352 config->state_dir = g_strdup(dfl_pathnames.state_dir);
1355 if (config->method == NULL) {
1356 config->method = g_strdup("virtio-serial");
1359 if (config->channel_path == NULL) {
1360 if (strcmp(config->method, "virtio-serial") == 0) {
1361 /* try the default path for the virtio-serial port */
1362 config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1363 } else if (strcmp(config->method, "isa-serial") == 0) {
1364 /* try the default path for the serial port - COM1 */
1365 config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1367 g_critical("must specify a path for this channel");
1373 s->log_level = config->log_level;
1374 s->log_file = stderr;
1375 #ifdef CONFIG_FSFREEZE
1376 s->fsfreeze_hook = config->fsfreeze_hook;
1378 s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1379 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1381 s->frozen = check_is_frozen(s);
1383 if (config->dumpconf) {
1384 config_dump(config);
1388 ret = run_agent(s, config);
1391 if (s->command_state) {
1392 ga_command_state_cleanup_all(s->command_state);
1395 ga_channel_free(s->channel);
1397 g_list_foreach(config->blacklist, free_blacklist_entry, NULL);
1398 g_free(s->pstate_filepath);
1399 g_free(s->state_filepath_isfrozen);
1401 if (config->daemonize) {
1402 unlink(config->pid_filepath);
1405 config_free(config);