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.
13 #include "qemu/osdep.h"
15 #include <glib/gstdio.h>
20 #include "qapi/qmp/json-streamer.h"
21 #include "qapi/qmp/json-parser.h"
22 #include "qapi/qmp/qjson.h"
23 #include "qga/guest-agent-core.h"
24 #include "qemu/module.h"
25 #include "qapi/qmp/qerror.h"
26 #include "qapi/qmp/dispatch.h"
27 #include "qga/channel.h"
28 #include "qemu/bswap.h"
29 #include "qemu/help_option.h"
30 #include "qemu/sockets.h"
31 #include "qemu/systemd.h"
32 #include "qemu-version.h"
34 #include "qga/service-win32.h"
35 #include "qga/vss-win32.h"
40 #define CONFIG_FSFREEZE
45 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
46 #define QGA_STATE_RELATIVE_DIR "run"
47 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
49 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
50 #define QGA_STATE_RELATIVE_DIR "qemu-ga"
51 #define QGA_SERIAL_PATH_DEFAULT "COM1"
53 #ifdef CONFIG_FSFREEZE
54 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
56 #define QGA_SENTINEL_BYTE 0xFF
57 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
60 const char *state_dir;
64 typedef struct GAPersistentState {
65 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
70 JSONMessageParser parser;
73 bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
74 GACommandState *command_state;
75 GLogLevelFlags log_level;
81 bool delimit_response;
84 char *state_filepath_isfrozen;
86 const char *log_filepath;
87 const char *pid_filepath;
89 #ifdef CONFIG_FSFREEZE
90 const char *fsfreeze_hook;
92 gchar *pstate_filepath;
93 GAPersistentState pstate;
96 struct GAState *ga_state;
97 QmpCommandList ga_commands;
99 /* commands that are safe to issue while filesystems are frozen */
100 static const char *ga_freeze_whitelist[] = {
104 "guest-sync-delimited",
105 "guest-fsfreeze-status",
106 "guest-fsfreeze-thaw",
111 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
113 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
117 init_dfl_pathnames(void)
119 g_assert(dfl_pathnames.state_dir == NULL);
120 g_assert(dfl_pathnames.pidfile == NULL);
121 dfl_pathnames.state_dir = qemu_get_local_state_pathname(
122 QGA_STATE_RELATIVE_DIR);
123 dfl_pathnames.pidfile = qemu_get_local_state_pathname(
124 QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
127 static void quit_handler(int sig)
129 /* if we're frozen, don't exit unless we're absolutely forced to,
130 * because it's basically impossible for graceful exit to complete
131 * unless all log/pid files are on unfreezable filesystems. there's
132 * also a very likely chance killing the agent before unfreezing
133 * the filesystems is a mistake (or will be viewed as one later).
134 * On Windows the freeze interval is limited to 10 seconds, so
135 * we should quit, but first we should wait for the timeout, thaw
136 * the filesystem and quit.
138 if (ga_is_frozen(ga_state)) {
142 HANDLE hEventTimeout;
144 g_debug("Thawing filesystems before exiting");
146 hEventTimeout = OpenEvent(EVENT_ALL_ACCESS, FALSE, EVENT_NAME_TIMEOUT);
148 WaitForSingleObject(hEventTimeout, 0);
149 CloseHandle(hEventTimeout);
151 qga_vss_fsfreeze(&i, false, &err);
153 g_debug("Error unfreezing filesystems prior to exiting: %s",
154 error_get_pretty(err));
161 g_debug("received signal num %d, quitting", sig);
163 if (g_main_loop_is_running(ga_state->main_loop)) {
164 g_main_loop_quit(ga_state->main_loop);
169 static gboolean register_signal_handlers(void)
171 struct sigaction sigact;
174 memset(&sigact, 0, sizeof(struct sigaction));
175 sigact.sa_handler = quit_handler;
177 ret = sigaction(SIGINT, &sigact, NULL);
179 g_error("error configuring signal handler: %s", strerror(errno));
181 ret = sigaction(SIGTERM, &sigact, NULL);
183 g_error("error configuring signal handler: %s", strerror(errno));
186 sigact.sa_handler = SIG_IGN;
187 if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
188 g_error("error configuring SIGPIPE signal handler: %s",
195 /* TODO: use this in place of all post-fork() fclose(std*) callers */
196 void reopen_fd_to_null(int fd)
200 nullfd = open("/dev/null", O_RDWR);
213 static void usage(const char *cmd)
216 "Usage: %s [-m <method> -p <path>] [<options>]\n"
217 "QEMU Guest Agent " QEMU_VERSION QEMU_PKGVERSION "\n"
220 " -m, --method transport method: one of unix-listen, virtio-serial,\n"
221 " isa-serial, or vsock-listen (virtio-serial is the default)\n"
222 " -p, --path device/socket path (the default for virtio-serial is:\n"
224 " the default for isa-serial is:\n"
226 " -l, --logfile set logfile path, logs to stderr by default\n"
227 " -f, --pidfile specify pidfile (default is %s)\n"
228 #ifdef CONFIG_FSFREEZE
229 " -F, --fsfreeze-hook\n"
230 " enable fsfreeze hook. Accepts an optional argument that\n"
231 " specifies script to run on freeze/thaw. Script will be\n"
232 " called with 'freeze'/'thaw' arguments accordingly.\n"
234 " If using -F with an argument, do not follow -F with a\n"
236 " (for example: -F/var/run/fsfreezehook.sh)\n"
238 " -t, --statedir specify dir to store state information (absolute paths\n"
239 " only, default is %s)\n"
240 " -v, --verbose log extra debugging information\n"
241 " -V, --version print version information and exit\n"
242 " -d, --daemonize become a daemon\n"
244 " -s, --service service commands: install, uninstall, vss-install, vss-uninstall\n"
246 " -b, --blacklist comma-separated list of RPCs to disable (no spaces, \"?\"\n"
247 " to list available RPCs)\n"
248 " -D, --dump-conf dump a qemu-ga config file based on current config\n"
249 " options / command-line parameters to stdout\n"
250 " -h, --help display this help and exit\n"
252 QEMU_HELP_BOTTOM "\n"
253 , cmd, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
254 dfl_pathnames.pidfile,
255 #ifdef CONFIG_FSFREEZE
256 QGA_FSFREEZE_HOOK_DEFAULT,
258 dfl_pathnames.state_dir);
261 static const char *ga_log_level_str(GLogLevelFlags level)
263 switch (level & G_LOG_LEVEL_MASK) {
264 case G_LOG_LEVEL_ERROR:
266 case G_LOG_LEVEL_CRITICAL:
268 case G_LOG_LEVEL_WARNING:
270 case G_LOG_LEVEL_MESSAGE:
272 case G_LOG_LEVEL_INFO:
274 case G_LOG_LEVEL_DEBUG:
281 bool ga_logging_enabled(GAState *s)
283 return s->logging_enabled;
286 void ga_disable_logging(GAState *s)
288 s->logging_enabled = false;
291 void ga_enable_logging(GAState *s)
293 s->logging_enabled = true;
296 static void ga_log(const gchar *domain, GLogLevelFlags level,
297 const gchar *msg, gpointer opaque)
301 const char *level_str = ga_log_level_str(level);
303 if (!ga_logging_enabled(s)) {
307 level &= G_LOG_LEVEL_MASK;
309 if (g_strcmp0(domain, "syslog") == 0) {
310 syslog(LOG_INFO, "%s: %s", level_str, msg);
311 } else if (level & s->log_level) {
313 if (level & s->log_level) {
315 g_get_current_time(&time);
317 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
322 void ga_set_response_delimited(GAState *s)
324 s->delimit_response = true;
327 static FILE *ga_open_logfile(const char *logfile)
331 f = fopen(logfile, "a");
336 qemu_set_cloexec(fileno(f));
341 static bool ga_open_pidfile(const char *pidfile)
346 pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
347 if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
348 g_critical("Cannot lock pid file, %s", strerror(errno));
355 if (ftruncate(pidfd, 0)) {
356 g_critical("Failed to truncate pid file");
359 snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
360 if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
361 g_critical("Failed to write pid file");
365 /* keep pidfile open & locked forever */
374 static bool ga_open_pidfile(const char *pidfile)
380 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
382 return strcmp(str1, str2);
385 /* disable commands that aren't safe for fsfreeze */
386 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
388 bool whitelisted = false;
390 const char *name = qmp_command_name(cmd);
392 while (ga_freeze_whitelist[i] != NULL) {
393 if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
399 g_debug("disabling command: %s", name);
400 qmp_disable_command(&ga_commands, name);
404 /* [re-]enable all commands, except those explicitly blacklisted by user */
405 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
407 GList *blacklist = opaque;
408 const char *name = qmp_command_name(cmd);
410 if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
411 !qmp_command_is_enabled(cmd)) {
412 g_debug("enabling command: %s", name);
413 qmp_enable_command(&ga_commands, name);
417 static bool ga_create_file(const char *path)
419 int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
421 g_warning("unable to open/create file %s: %s", path, strerror(errno));
428 static bool ga_delete_file(const char *path)
430 int ret = unlink(path);
432 g_warning("unable to delete file: %s: %s", path, strerror(errno));
439 bool ga_is_frozen(GAState *s)
444 void ga_set_frozen(GAState *s)
446 if (ga_is_frozen(s)) {
449 /* disable all non-whitelisted (for frozen state) commands */
450 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
451 g_warning("disabling logging due to filesystem freeze");
452 ga_disable_logging(s);
454 if (!ga_create_file(s->state_filepath_isfrozen)) {
455 g_warning("unable to create %s, fsfreeze may not function properly",
456 s->state_filepath_isfrozen);
460 void ga_unset_frozen(GAState *s)
462 if (!ga_is_frozen(s)) {
466 /* if we delayed creation/opening of pid/log files due to being
467 * in a frozen state at start up, do it now
469 if (s->deferred_options.log_filepath) {
470 s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
472 s->log_file = stderr;
474 s->deferred_options.log_filepath = NULL;
476 ga_enable_logging(s);
477 g_warning("logging re-enabled due to filesystem unfreeze");
478 if (s->deferred_options.pid_filepath) {
479 if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
480 g_warning("failed to create/open pid file");
482 s->deferred_options.pid_filepath = NULL;
485 /* enable all disabled, non-blacklisted commands */
486 qmp_for_each_command(&ga_commands, ga_enable_non_blacklisted, s->blacklist);
488 if (!ga_delete_file(s->state_filepath_isfrozen)) {
489 g_warning("unable to delete %s, fsfreeze may not function properly",
490 s->state_filepath_isfrozen);
494 #ifdef CONFIG_FSFREEZE
495 const char *ga_fsfreeze_hook(GAState *s)
497 return s->fsfreeze_hook;
501 static void become_daemon(const char *pidfile)
515 if (!ga_open_pidfile(pidfile)) {
516 g_critical("failed to create pidfile");
521 umask(S_IRWXG | S_IRWXO);
526 if ((chdir("/")) < 0) {
530 reopen_fd_to_null(STDIN_FILENO);
531 reopen_fd_to_null(STDOUT_FILENO);
532 reopen_fd_to_null(STDERR_FILENO);
539 g_critical("failed to daemonize");
544 static int send_response(GAState *s, QObject *payload)
547 QString *payload_qstr, *response_qstr;
550 g_assert(payload && s->channel);
552 payload_qstr = qobject_to_json(payload);
557 if (s->delimit_response) {
558 s->delimit_response = false;
559 response_qstr = qstring_new();
560 qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
561 qstring_append(response_qstr, qstring_get_str(payload_qstr));
562 QDECREF(payload_qstr);
564 response_qstr = payload_qstr;
567 qstring_append_chr(response_qstr, '\n');
568 buf = qstring_get_str(response_qstr);
569 status = ga_channel_write_all(s->channel, buf, strlen(buf));
570 QDECREF(response_qstr);
571 if (status != G_IO_STATUS_NORMAL) {
578 static void process_command(GAState *s, QDict *req)
584 g_debug("processing command");
585 rsp = qmp_dispatch(&ga_commands, QOBJECT(req));
587 ret = send_response(s, rsp);
589 g_warning("error sending response: %s", strerror(-ret));
595 /* handle requests/control events coming in over the channel */
596 static void process_event(JSONMessageParser *parser, GQueue *tokens)
598 GAState *s = container_of(parser, GAState, parser);
603 g_assert(s && parser);
605 g_debug("process_event: called");
606 qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
611 g_warning("failed to parse event: unknown error");
612 error_setg(&err, QERR_JSON_PARSING);
614 g_warning("failed to parse event: %s", error_get_pretty(err));
616 qdict_put_obj(qdict, "error", qmp_build_error_object(err));
620 /* handle host->guest commands */
621 if (qdict_haskey(qdict, "execute")) {
622 process_command(s, qdict);
624 if (!qdict_haskey(qdict, "error")) {
627 g_warning("unrecognized payload format");
628 error_setg(&err, QERR_UNSUPPORTED);
629 qdict_put_obj(qdict, "error", qmp_build_error_object(err));
632 ret = send_response(s, QOBJECT(qdict));
634 g_warning("error sending error response: %s", strerror(-ret));
641 /* false return signals GAChannel to close the current client connection */
642 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
645 gchar buf[QGA_READ_COUNT_DEFAULT+1];
647 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
649 case G_IO_STATUS_ERROR:
650 g_warning("error reading channel");
652 case G_IO_STATUS_NORMAL:
654 g_debug("read data, count: %d, data: %s", (int)count, buf);
655 json_message_parser_feed(&s->parser, (char *)buf, (int)count);
657 case G_IO_STATUS_EOF:
658 g_debug("received EOF");
663 case G_IO_STATUS_AGAIN:
664 /* virtio causes us to spin here when no process is attached to
665 * host-side chardev. sleep a bit to mitigate this
672 g_warning("unknown channel read status, closing");
678 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path,
681 GAChannelMethod channel_method;
683 if (strcmp(method, "virtio-serial") == 0) {
684 s->virtio = true; /* virtio requires special handling in some cases */
685 channel_method = GA_CHANNEL_VIRTIO_SERIAL;
686 } else if (strcmp(method, "isa-serial") == 0) {
687 channel_method = GA_CHANNEL_ISA_SERIAL;
688 } else if (strcmp(method, "unix-listen") == 0) {
689 channel_method = GA_CHANNEL_UNIX_LISTEN;
690 } else if (strcmp(method, "vsock-listen") == 0) {
691 channel_method = GA_CHANNEL_VSOCK_LISTEN;
693 g_critical("unsupported channel method/type: %s", method);
697 s->channel = ga_channel_new(channel_method, path, listen_fd,
698 channel_event_cb, s);
700 g_critical("failed to create guest agent channel");
708 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
711 DWORD ret = NO_ERROR;
712 GAService *service = &ga_state->service;
716 case SERVICE_CONTROL_STOP:
717 case SERVICE_CONTROL_SHUTDOWN:
718 quit_handler(SIGTERM);
719 service->status.dwCurrentState = SERVICE_STOP_PENDING;
720 SetServiceStatus(service->status_handle, &service->status);
724 ret = ERROR_CALL_NOT_IMPLEMENTED;
729 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
731 GAService *service = &ga_state->service;
733 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
734 service_ctrl_handler, NULL);
736 if (service->status_handle == 0) {
737 g_critical("Failed to register extended requests function!\n");
741 service->status.dwServiceType = SERVICE_WIN32;
742 service->status.dwCurrentState = SERVICE_RUNNING;
743 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
744 service->status.dwWin32ExitCode = NO_ERROR;
745 service->status.dwServiceSpecificExitCode = NO_ERROR;
746 service->status.dwCheckPoint = 0;
747 service->status.dwWaitHint = 0;
748 SetServiceStatus(service->status_handle, &service->status);
750 g_main_loop_run(ga_state->main_loop);
752 service->status.dwCurrentState = SERVICE_STOPPED;
753 SetServiceStatus(service->status_handle, &service->status);
757 static void set_persistent_state_defaults(GAPersistentState *pstate)
760 pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
763 static void persistent_state_from_keyfile(GAPersistentState *pstate,
768 /* if any fields are missing, either because the file was tampered with
769 * by agents of chaos, or because the field wasn't present at the time the
770 * file was created, the best we can ever do is start over with the default
771 * values. so load them now, and ignore any errors in accessing key-value
774 set_persistent_state_defaults(pstate);
776 if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
778 g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
782 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
788 g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
791 static gboolean write_persistent_state(const GAPersistentState *pstate,
794 GKeyFile *keyfile = g_key_file_new();
802 persistent_state_to_keyfile(pstate, keyfile);
803 data = g_key_file_to_data(keyfile, &data_len, &gerr);
805 g_critical("failed to convert persistent state to string: %s",
811 g_file_set_contents(path, data, data_len, &gerr);
813 g_critical("failed to write persistent state to %s: %s",
814 path, gerr->message);
824 g_key_file_free(keyfile);
830 static gboolean read_persistent_state(GAPersistentState *pstate,
831 const gchar *path, gboolean frozen)
833 GKeyFile *keyfile = NULL;
840 if (stat(path, &st) == -1) {
841 /* it's okay if state file doesn't exist, but any other error
842 * indicates a permissions issue or some other misconfiguration
843 * that we likely won't be able to recover from.
845 if (errno != ENOENT) {
846 g_critical("unable to access state file at path %s: %s",
847 path, strerror(errno));
852 /* file doesn't exist. initialize state to default values and
853 * attempt to save now. (we could wait till later when we have
854 * modified state we need to commit, but if there's a problem,
855 * such as a missing parent directory, we want to catch it now)
857 * there is a potential scenario where someone either managed to
858 * update the agent from a version that didn't use a key store
859 * while qemu-ga thought the filesystem was frozen, or
860 * deleted the key store prior to issuing a fsfreeze, prior
861 * to restarting the agent. in this case we go ahead and defer
862 * initial creation till we actually have modified state to
863 * write, otherwise fail to recover from freeze.
865 set_persistent_state_defaults(pstate);
867 ret = write_persistent_state(pstate, path);
869 g_critical("unable to create state file at path %s", path);
878 keyfile = g_key_file_new();
879 g_key_file_load_from_file(keyfile, path, 0, &gerr);
881 g_critical("error loading persistent state from path: %s, %s",
882 path, gerr->message);
887 persistent_state_from_keyfile(pstate, keyfile);
891 g_key_file_free(keyfile);
900 int64_t ga_get_fd_handle(GAState *s, Error **errp)
904 g_assert(s->pstate_filepath);
905 /* we blacklist commands and avoid operations that potentially require
906 * writing to disk when we're in a frozen state. this includes opening
907 * new files, so we should never get here in that situation
909 g_assert(!ga_is_frozen(s));
911 handle = s->pstate.fd_counter++;
913 /* This should never happen on a reasonable timeframe, as guest-file-open
914 * would have to be issued 2^63 times */
915 if (s->pstate.fd_counter == INT64_MAX) {
919 if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
920 error_setg(errp, "failed to commit persistent state to disk");
927 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
929 printf("%s\n", qmp_command_name(cmd));
932 static GList *split_list(const gchar *str, const gchar *delim)
938 strv = g_strsplit(str, delim, -1);
939 for (i = 0; strv[i]; i++) {
940 list = g_list_prepend(list, strv[i]);
947 typedef struct GAConfig {
952 #ifdef CONFIG_FSFREEZE
959 gchar *bliststr; /* blacklist may point to this string */
962 GLogLevelFlags log_level;
966 static void config_load(GAConfig *config)
970 const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
972 /* read system config */
973 keyfile = g_key_file_new();
974 if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
977 if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
979 g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
981 if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
983 g_key_file_get_string(keyfile, "general", "method", &gerr);
985 if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
986 config->channel_path =
987 g_key_file_get_string(keyfile, "general", "path", &gerr);
989 if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
990 config->log_filepath =
991 g_key_file_get_string(keyfile, "general", "logfile", &gerr);
993 if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
994 config->pid_filepath =
995 g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
997 #ifdef CONFIG_FSFREEZE
998 if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
999 config->fsfreeze_hook =
1000 g_key_file_get_string(keyfile,
1001 "general", "fsfreeze-hook", &gerr);
1004 if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
1006 g_key_file_get_string(keyfile, "general", "statedir", &gerr);
1008 if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
1009 g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
1010 /* enable all log levels */
1011 config->log_level = G_LOG_LEVEL_MASK;
1013 if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
1015 g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
1016 config->blacklist = g_list_concat(config->blacklist,
1017 split_list(config->bliststr, ","));
1021 g_key_file_free(keyfile);
1023 !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1024 g_critical("error loading configuration from path: %s, %s",
1025 QGA_CONF_DEFAULT, gerr->message);
1028 g_clear_error(&gerr);
1031 static gchar *list_join(GList *list, const gchar separator)
1033 GString *str = g_string_new("");
1036 str = g_string_append(str, (gchar *)list->data);
1037 list = g_list_next(list);
1039 str = g_string_append_c(str, separator);
1043 return g_string_free(str, FALSE);
1046 static void config_dump(GAConfig *config)
1048 GError *error = NULL;
1052 keyfile = g_key_file_new();
1055 g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1056 g_key_file_set_string(keyfile, "general", "method", config->method);
1057 if (config->channel_path) {
1058 g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1060 if (config->log_filepath) {
1061 g_key_file_set_string(keyfile, "general", "logfile",
1062 config->log_filepath);
1064 g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1065 #ifdef CONFIG_FSFREEZE
1066 if (config->fsfreeze_hook) {
1067 g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1068 config->fsfreeze_hook);
1071 g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1072 g_key_file_set_boolean(keyfile, "general", "verbose",
1073 config->log_level == G_LOG_LEVEL_MASK);
1074 tmp = list_join(config->blacklist, ',');
1075 g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1078 tmp = g_key_file_to_data(keyfile, NULL, &error);
1080 g_critical("Failed to dump keyfile: %s", error->message);
1081 g_clear_error(&error);
1087 g_key_file_free(keyfile);
1090 static void config_parse(GAConfig *config, int argc, char **argv)
1092 const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1093 int opt_ind = 0, ch;
1094 const struct option lopt[] = {
1095 { "help", 0, NULL, 'h' },
1096 { "version", 0, NULL, 'V' },
1097 { "dump-conf", 0, NULL, 'D' },
1098 { "logfile", 1, NULL, 'l' },
1099 { "pidfile", 1, NULL, 'f' },
1100 #ifdef CONFIG_FSFREEZE
1101 { "fsfreeze-hook", 2, NULL, 'F' },
1103 { "verbose", 0, NULL, 'v' },
1104 { "method", 1, NULL, 'm' },
1105 { "path", 1, NULL, 'p' },
1106 { "daemonize", 0, NULL, 'd' },
1107 { "blacklist", 1, NULL, 'b' },
1109 { "service", 1, NULL, 's' },
1111 { "statedir", 1, NULL, 't' },
1112 { NULL, 0, NULL, 0 }
1115 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1118 g_free(config->method);
1119 config->method = g_strdup(optarg);
1122 g_free(config->channel_path);
1123 config->channel_path = g_strdup(optarg);
1126 g_free(config->log_filepath);
1127 config->log_filepath = g_strdup(optarg);
1130 g_free(config->pid_filepath);
1131 config->pid_filepath = g_strdup(optarg);
1133 #ifdef CONFIG_FSFREEZE
1135 g_free(config->fsfreeze_hook);
1136 config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1140 g_free(config->state_dir);
1141 config->state_dir = g_strdup(optarg);
1144 /* enable all log levels */
1145 config->log_level = G_LOG_LEVEL_MASK;
1148 printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1151 config->daemonize = 1;
1154 config->dumpconf = 1;
1157 if (is_help_option(optarg)) {
1158 qmp_for_each_command(&ga_commands, ga_print_cmd, NULL);
1161 config->blacklist = g_list_concat(config->blacklist,
1162 split_list(optarg, ","));
1167 config->service = optarg;
1168 if (strcmp(config->service, "install") == 0) {
1169 if (ga_install_vss_provider()) {
1172 if (ga_install_service(config->channel_path,
1173 config->log_filepath, config->state_dir)) {
1177 } else if (strcmp(config->service, "uninstall") == 0) {
1178 ga_uninstall_vss_provider();
1179 exit(ga_uninstall_service());
1180 } else if (strcmp(config->service, "vss-install") == 0) {
1181 if (ga_install_vss_provider()) {
1185 } else if (strcmp(config->service, "vss-uninstall") == 0) {
1186 ga_uninstall_vss_provider();
1189 printf("Unknown service command.\n");
1198 g_print("Unknown option, try '%s --help' for more information.\n",
1205 static void config_free(GAConfig *config)
1207 g_free(config->method);
1208 g_free(config->log_filepath);
1209 g_free(config->pid_filepath);
1210 g_free(config->state_dir);
1211 g_free(config->channel_path);
1212 g_free(config->bliststr);
1213 #ifdef CONFIG_FSFREEZE
1214 g_free(config->fsfreeze_hook);
1216 g_list_free_full(config->blacklist, g_free);
1220 static bool check_is_frozen(GAState *s)
1223 /* check if a previous instance of qemu-ga exited with filesystems' state
1224 * marked as frozen. this could be a stale value (a non-qemu-ga process
1225 * or reboot may have since unfrozen them), but better to require an
1226 * uneeded unfreeze than to risk hanging on start-up
1229 if (stat(s->state_filepath_isfrozen, &st) == -1) {
1230 /* it's okay if the file doesn't exist, but if we can't access for
1231 * some other reason, such as permissions, there's a configuration
1232 * that needs to be addressed. so just bail now before we get into
1233 * more trouble later
1235 if (errno != ENOENT) {
1236 g_critical("unable to access state file at path %s: %s",
1237 s->state_filepath_isfrozen, strerror(errno));
1238 return EXIT_FAILURE;
1241 g_warning("previous instance appears to have exited with frozen"
1242 " filesystems. deferring logging/pidfile creation and"
1243 " disabling non-fsfreeze-safe commands until"
1244 " guest-fsfreeze-thaw is issued, or filesystems are"
1245 " manually unfrozen and the file %s is removed",
1246 s->state_filepath_isfrozen);
1253 static int run_agent(GAState *s, GAConfig *config, int socket_activation)
1257 g_log_set_default_handler(ga_log, s);
1258 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1259 ga_enable_logging(s);
1262 /* On win32 the state directory is application specific (be it the default
1263 * or a user override). We got past the command line parsing; let's create
1264 * the directory (with any intermediate directories). If we run into an
1265 * error later on, we won't try to clean up the directory, it is considered
1268 if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1269 g_critical("unable to create (an ancestor of) the state directory"
1270 " '%s': %s", config->state_dir, strerror(errno));
1271 return EXIT_FAILURE;
1275 if (ga_is_frozen(s)) {
1276 if (config->daemonize) {
1277 /* delay opening/locking of pidfile till filesystems are unfrozen */
1278 s->deferred_options.pid_filepath = config->pid_filepath;
1279 become_daemon(NULL);
1281 if (config->log_filepath) {
1282 /* delay opening the log file till filesystems are unfrozen */
1283 s->deferred_options.log_filepath = config->log_filepath;
1285 ga_disable_logging(s);
1286 qmp_for_each_command(&ga_commands, ga_disable_non_whitelisted, NULL);
1288 if (config->daemonize) {
1289 become_daemon(config->pid_filepath);
1291 if (config->log_filepath) {
1292 FILE *log_file = ga_open_logfile(config->log_filepath);
1294 g_critical("unable to open specified log file: %s",
1296 return EXIT_FAILURE;
1298 s->log_file = log_file;
1302 /* load persistent state from disk */
1303 if (!read_persistent_state(&s->pstate,
1306 g_critical("failed to load persistent state");
1307 return EXIT_FAILURE;
1310 config->blacklist = ga_command_blacklist_init(config->blacklist);
1311 if (config->blacklist) {
1312 GList *l = config->blacklist;
1313 s->blacklist = config->blacklist;
1315 g_debug("disabling command: %s", (char *)l->data);
1316 qmp_disable_command(&ga_commands, l->data);
1320 s->command_state = ga_command_state_new();
1321 ga_command_state_init(s, s->command_state);
1322 ga_command_state_init_all(s->command_state);
1323 json_message_parser_init(&s->parser, process_event);
1326 if (!register_signal_handlers()) {
1327 g_critical("failed to register signal handlers");
1328 return EXIT_FAILURE;
1332 s->main_loop = g_main_loop_new(NULL, false);
1334 if (!channel_init(ga_state, config->method, config->channel_path,
1335 socket_activation ? FIRST_SOCKET_ACTIVATION_FD : -1)) {
1336 g_critical("failed to initialize guest agent channel");
1337 return EXIT_FAILURE;
1340 g_main_loop_run(ga_state->main_loop);
1342 if (config->daemonize) {
1343 SERVICE_TABLE_ENTRY service_table[] = {
1344 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1345 StartServiceCtrlDispatcher(service_table);
1347 g_main_loop_run(ga_state->main_loop);
1351 return EXIT_SUCCESS;
1354 int main(int argc, char **argv)
1356 int ret = EXIT_SUCCESS;
1357 GAState *s = g_new0(GAState, 1);
1358 GAConfig *config = g_new0(GAConfig, 1);
1359 int socket_activation;
1361 config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1363 qga_qmp_init_marshal(&ga_commands);
1365 init_dfl_pathnames();
1366 config_load(config);
1367 config_parse(config, argc, argv);
1369 if (config->pid_filepath == NULL) {
1370 config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1373 if (config->state_dir == NULL) {
1374 config->state_dir = g_strdup(dfl_pathnames.state_dir);
1377 if (config->method == NULL) {
1378 config->method = g_strdup("virtio-serial");
1381 socket_activation = check_socket_activation();
1382 if (socket_activation > 1) {
1383 g_critical("qemu-ga only supports listening on one socket");
1387 if (socket_activation) {
1388 SocketAddress *addr;
1390 g_free(config->method);
1391 g_free(config->channel_path);
1392 config->method = NULL;
1393 config->channel_path = NULL;
1395 addr = socket_local_address(FIRST_SOCKET_ACTIVATION_FD, NULL);
1397 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1398 config->method = g_strdup("unix-listen");
1399 } else if (addr->type == SOCKET_ADDRESS_TYPE_VSOCK) {
1400 config->method = g_strdup("vsock-listen");
1403 qapi_free_SocketAddress(addr);
1406 if (!config->method) {
1407 g_critical("unsupported listen fd type");
1411 } else if (config->channel_path == NULL) {
1412 if (strcmp(config->method, "virtio-serial") == 0) {
1413 /* try the default path for the virtio-serial port */
1414 config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1415 } else if (strcmp(config->method, "isa-serial") == 0) {
1416 /* try the default path for the serial port - COM1 */
1417 config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1419 g_critical("must specify a path for this channel");
1425 s->log_level = config->log_level;
1426 s->log_file = stderr;
1427 #ifdef CONFIG_FSFREEZE
1428 s->fsfreeze_hook = config->fsfreeze_hook;
1430 s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1431 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1433 s->frozen = check_is_frozen(s);
1435 if (config->dumpconf) {
1436 config_dump(config);
1440 ret = run_agent(s, config, socket_activation);
1443 if (s->command_state) {
1444 ga_command_state_cleanup_all(s->command_state);
1445 ga_command_state_free(s->command_state);
1446 json_message_parser_destroy(&s->parser);
1449 ga_channel_free(s->channel);
1451 g_free(s->pstate_filepath);
1452 g_free(s->state_filepath_isfrozen);
1454 if (config->daemonize) {
1455 unlink(config->pid_filepath);
1458 config_free(config);
1460 g_main_loop_unref(s->main_loop);