s390x: remove s390-zipl.rom
[qemu/ar7.git] / qga / main.c
blob0a168e2da8d5b7bdfa90ce8232c98f59173d1f66
1 /*
2 * QEMU Guest Agent
4 * Copyright IBM Corp. 2011
6 * Authors:
7 * Adam Litke <aglitke@linux.vnet.ibm.com>
8 * Michael Roth <mdroth@linux.vnet.ibm.com>
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"
14 #include <glib.h>
15 #include <getopt.h>
16 #include <glib/gstdio.h>
17 #ifndef _WIN32
18 #include <syslog.h>
19 #include <sys/wait.h>
20 #endif
21 #include "qapi/qmp/json-streamer.h"
22 #include "qapi/qmp/json-parser.h"
23 #include "qapi/qmp/qint.h"
24 #include "qapi/qmp/qjson.h"
25 #include "qga/guest-agent-core.h"
26 #include "qemu/module.h"
27 #include "signal.h"
28 #include "qapi/qmp/qerror.h"
29 #include "qapi/qmp/dispatch.h"
30 #include "qga/channel.h"
31 #include "qemu/bswap.h"
32 #ifdef _WIN32
33 #include "qga/service-win32.h"
34 #include "qga/vss-win32.h"
35 #endif
36 #ifdef __linux__
37 #include <linux/fs.h>
38 #ifdef FIFREEZE
39 #define CONFIG_FSFREEZE
40 #endif
41 #endif
43 #ifndef _WIN32
44 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
45 #define QGA_STATE_RELATIVE_DIR "run"
46 #define QGA_SERIAL_PATH_DEFAULT "/dev/ttyS0"
47 #else
48 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
49 #define QGA_STATE_RELATIVE_DIR "qemu-ga"
50 #define QGA_SERIAL_PATH_DEFAULT "COM1"
51 #endif
52 #ifdef CONFIG_FSFREEZE
53 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
54 #endif
55 #define QGA_SENTINEL_BYTE 0xFF
56 #define QGA_CONF_DEFAULT CONFIG_QEMU_CONFDIR G_DIR_SEPARATOR_S "qemu-ga.conf"
58 static struct {
59 const char *state_dir;
60 const char *pidfile;
61 } dfl_pathnames;
63 typedef struct GAPersistentState {
64 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
65 int64_t fd_counter;
66 } GAPersistentState;
68 struct GAState {
69 JSONMessageParser parser;
70 GMainLoop *main_loop;
71 GAChannel *channel;
72 bool virtio; /* fastpath to check for virtio to deal with poll() quirks */
73 GACommandState *command_state;
74 GLogLevelFlags log_level;
75 FILE *log_file;
76 bool logging_enabled;
77 #ifdef _WIN32
78 GAService service;
79 #endif
80 bool delimit_response;
81 bool frozen;
82 GList *blacklist;
83 char *state_filepath_isfrozen;
84 struct {
85 const char *log_filepath;
86 const char *pid_filepath;
87 } deferred_options;
88 #ifdef CONFIG_FSFREEZE
89 const char *fsfreeze_hook;
90 #endif
91 gchar *pstate_filepath;
92 GAPersistentState pstate;
95 struct GAState *ga_state;
97 /* commands that are safe to issue while filesystems are frozen */
98 static const char *ga_freeze_whitelist[] = {
99 "guest-ping",
100 "guest-info",
101 "guest-sync",
102 "guest-sync-delimited",
103 "guest-fsfreeze-status",
104 "guest-fsfreeze-thaw",
105 NULL
108 #ifdef _WIN32
109 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
110 LPVOID ctx);
111 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
112 #endif
114 static void
115 init_dfl_pathnames(void)
117 g_assert(dfl_pathnames.state_dir == NULL);
118 g_assert(dfl_pathnames.pidfile == NULL);
119 dfl_pathnames.state_dir = qemu_get_local_state_pathname(
120 QGA_STATE_RELATIVE_DIR);
121 dfl_pathnames.pidfile = qemu_get_local_state_pathname(
122 QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
125 static void quit_handler(int sig)
127 /* if we're frozen, don't exit unless we're absolutely forced to,
128 * because it's basically impossible for graceful exit to complete
129 * unless all log/pid files are on unfreezable filesystems. there's
130 * also a very likely chance killing the agent before unfreezing
131 * the filesystems is a mistake (or will be viewed as one later).
133 if (ga_is_frozen(ga_state)) {
134 return;
136 g_debug("received signal num %d, quitting", sig);
138 if (g_main_loop_is_running(ga_state->main_loop)) {
139 g_main_loop_quit(ga_state->main_loop);
143 #ifndef _WIN32
144 static gboolean register_signal_handlers(void)
146 struct sigaction sigact;
147 int ret;
149 memset(&sigact, 0, sizeof(struct sigaction));
150 sigact.sa_handler = quit_handler;
152 ret = sigaction(SIGINT, &sigact, NULL);
153 if (ret == -1) {
154 g_error("error configuring signal handler: %s", strerror(errno));
156 ret = sigaction(SIGTERM, &sigact, NULL);
157 if (ret == -1) {
158 g_error("error configuring signal handler: %s", strerror(errno));
161 sigact.sa_handler = SIG_IGN;
162 if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
163 g_error("error configuring SIGPIPE signal handler: %s",
164 strerror(errno));
167 return true;
170 /* TODO: use this in place of all post-fork() fclose(std*) callers */
171 void reopen_fd_to_null(int fd)
173 int nullfd;
175 nullfd = open("/dev/null", O_RDWR);
176 if (nullfd < 0) {
177 return;
180 dup2(nullfd, fd);
182 if (nullfd != fd) {
183 close(nullfd);
186 #endif
188 static void usage(const char *cmd)
190 printf(
191 "Usage: %s [-m <method> -p <path>] [<options>]\n"
192 "QEMU Guest Agent %s\n"
193 "\n"
194 " -m, --method transport method: one of unix-listen, virtio-serial, or\n"
195 " isa-serial (virtio-serial is the default)\n"
196 " -p, --path device/socket path (the default for virtio-serial is:\n"
197 " %s,\n"
198 " the default for isa-serial is:\n"
199 " %s)\n"
200 " -l, --logfile set logfile path, logs to stderr by default\n"
201 " -f, --pidfile specify pidfile (default is %s)\n"
202 #ifdef CONFIG_FSFREEZE
203 " -F, --fsfreeze-hook\n"
204 " enable fsfreeze hook. Accepts an optional argument that\n"
205 " specifies script to run on freeze/thaw. Script will be\n"
206 " called with 'freeze'/'thaw' arguments accordingly.\n"
207 " (default is %s)\n"
208 " If using -F with an argument, do not follow -F with a\n"
209 " space.\n"
210 " (for example: -F/var/run/fsfreezehook.sh)\n"
211 #endif
212 " -t, --statedir specify dir to store state information (absolute paths\n"
213 " only, default is %s)\n"
214 " -v, --verbose log extra debugging information\n"
215 " -V, --version print version information and exit\n"
216 " -d, --daemonize become a daemon\n"
217 #ifdef _WIN32
218 " -s, --service service commands: install, uninstall, vss-install, vss-uninstall\n"
219 #endif
220 " -b, --blacklist comma-separated list of RPCs to disable (no spaces, \"?\"\n"
221 " to list available RPCs)\n"
222 " -D, --dump-conf dump a qemu-ga config file based on current config\n"
223 " options / command-line parameters to stdout\n"
224 " -h, --help display this help and exit\n"
225 "\n"
226 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
227 , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_SERIAL_PATH_DEFAULT,
228 dfl_pathnames.pidfile,
229 #ifdef CONFIG_FSFREEZE
230 QGA_FSFREEZE_HOOK_DEFAULT,
231 #endif
232 dfl_pathnames.state_dir);
235 static const char *ga_log_level_str(GLogLevelFlags level)
237 switch (level & G_LOG_LEVEL_MASK) {
238 case G_LOG_LEVEL_ERROR:
239 return "error";
240 case G_LOG_LEVEL_CRITICAL:
241 return "critical";
242 case G_LOG_LEVEL_WARNING:
243 return "warning";
244 case G_LOG_LEVEL_MESSAGE:
245 return "message";
246 case G_LOG_LEVEL_INFO:
247 return "info";
248 case G_LOG_LEVEL_DEBUG:
249 return "debug";
250 default:
251 return "user";
255 bool ga_logging_enabled(GAState *s)
257 return s->logging_enabled;
260 void ga_disable_logging(GAState *s)
262 s->logging_enabled = false;
265 void ga_enable_logging(GAState *s)
267 s->logging_enabled = true;
270 static void ga_log(const gchar *domain, GLogLevelFlags level,
271 const gchar *msg, gpointer opaque)
273 GAState *s = opaque;
274 GTimeVal time;
275 const char *level_str = ga_log_level_str(level);
277 if (!ga_logging_enabled(s)) {
278 return;
281 level &= G_LOG_LEVEL_MASK;
282 #ifndef _WIN32
283 if (g_strcmp0(domain, "syslog") == 0) {
284 syslog(LOG_INFO, "%s: %s", level_str, msg);
285 } else if (level & s->log_level) {
286 #else
287 if (level & s->log_level) {
288 #endif
289 g_get_current_time(&time);
290 fprintf(s->log_file,
291 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
292 fflush(s->log_file);
296 void ga_set_response_delimited(GAState *s)
298 s->delimit_response = true;
301 static FILE *ga_open_logfile(const char *logfile)
303 FILE *f;
305 f = fopen(logfile, "a");
306 if (!f) {
307 return NULL;
310 qemu_set_cloexec(fileno(f));
311 return f;
314 #ifndef _WIN32
315 static bool ga_open_pidfile(const char *pidfile)
317 int pidfd;
318 char pidstr[32];
320 pidfd = qemu_open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
321 if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
322 g_critical("Cannot lock pid file, %s", strerror(errno));
323 if (pidfd != -1) {
324 close(pidfd);
326 return false;
329 if (ftruncate(pidfd, 0)) {
330 g_critical("Failed to truncate pid file");
331 goto fail;
333 snprintf(pidstr, sizeof(pidstr), "%d\n", getpid());
334 if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
335 g_critical("Failed to write pid file");
336 goto fail;
339 /* keep pidfile open & locked forever */
340 return true;
342 fail:
343 unlink(pidfile);
344 close(pidfd);
345 return false;
347 #else /* _WIN32 */
348 static bool ga_open_pidfile(const char *pidfile)
350 return true;
352 #endif
354 static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
356 return strcmp(str1, str2);
359 /* disable commands that aren't safe for fsfreeze */
360 static void ga_disable_non_whitelisted(QmpCommand *cmd, void *opaque)
362 bool whitelisted = false;
363 int i = 0;
364 const char *name = qmp_command_name(cmd);
366 while (ga_freeze_whitelist[i] != NULL) {
367 if (strcmp(name, ga_freeze_whitelist[i]) == 0) {
368 whitelisted = true;
370 i++;
372 if (!whitelisted) {
373 g_debug("disabling command: %s", name);
374 qmp_disable_command(name);
378 /* [re-]enable all commands, except those explicitly blacklisted by user */
379 static void ga_enable_non_blacklisted(QmpCommand *cmd, void *opaque)
381 GList *blacklist = opaque;
382 const char *name = qmp_command_name(cmd);
384 if (g_list_find_custom(blacklist, name, ga_strcmp) == NULL &&
385 !qmp_command_is_enabled(cmd)) {
386 g_debug("enabling command: %s", name);
387 qmp_enable_command(name);
391 static bool ga_create_file(const char *path)
393 int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
394 if (fd == -1) {
395 g_warning("unable to open/create file %s: %s", path, strerror(errno));
396 return false;
398 close(fd);
399 return true;
402 static bool ga_delete_file(const char *path)
404 int ret = unlink(path);
405 if (ret == -1) {
406 g_warning("unable to delete file: %s: %s", path, strerror(errno));
407 return false;
410 return true;
413 bool ga_is_frozen(GAState *s)
415 return s->frozen;
418 void ga_set_frozen(GAState *s)
420 if (ga_is_frozen(s)) {
421 return;
423 /* disable all non-whitelisted (for frozen state) commands */
424 qmp_for_each_command(ga_disable_non_whitelisted, NULL);
425 g_warning("disabling logging due to filesystem freeze");
426 ga_disable_logging(s);
427 s->frozen = true;
428 if (!ga_create_file(s->state_filepath_isfrozen)) {
429 g_warning("unable to create %s, fsfreeze may not function properly",
430 s->state_filepath_isfrozen);
434 void ga_unset_frozen(GAState *s)
436 if (!ga_is_frozen(s)) {
437 return;
440 /* if we delayed creation/opening of pid/log files due to being
441 * in a frozen state at start up, do it now
443 if (s->deferred_options.log_filepath) {
444 s->log_file = ga_open_logfile(s->deferred_options.log_filepath);
445 if (!s->log_file) {
446 s->log_file = stderr;
448 s->deferred_options.log_filepath = NULL;
450 ga_enable_logging(s);
451 g_warning("logging re-enabled due to filesystem unfreeze");
452 if (s->deferred_options.pid_filepath) {
453 if (!ga_open_pidfile(s->deferred_options.pid_filepath)) {
454 g_warning("failed to create/open pid file");
456 s->deferred_options.pid_filepath = NULL;
459 /* enable all disabled, non-blacklisted commands */
460 qmp_for_each_command(ga_enable_non_blacklisted, s->blacklist);
461 s->frozen = false;
462 if (!ga_delete_file(s->state_filepath_isfrozen)) {
463 g_warning("unable to delete %s, fsfreeze may not function properly",
464 s->state_filepath_isfrozen);
468 #ifdef CONFIG_FSFREEZE
469 const char *ga_fsfreeze_hook(GAState *s)
471 return s->fsfreeze_hook;
473 #endif
475 static void become_daemon(const char *pidfile)
477 #ifndef _WIN32
478 pid_t pid, sid;
480 pid = fork();
481 if (pid < 0) {
482 exit(EXIT_FAILURE);
484 if (pid > 0) {
485 exit(EXIT_SUCCESS);
488 if (pidfile) {
489 if (!ga_open_pidfile(pidfile)) {
490 g_critical("failed to create pidfile");
491 exit(EXIT_FAILURE);
495 umask(S_IRWXG | S_IRWXO);
496 sid = setsid();
497 if (sid < 0) {
498 goto fail;
500 if ((chdir("/")) < 0) {
501 goto fail;
504 reopen_fd_to_null(STDIN_FILENO);
505 reopen_fd_to_null(STDOUT_FILENO);
506 reopen_fd_to_null(STDERR_FILENO);
507 return;
509 fail:
510 if (pidfile) {
511 unlink(pidfile);
513 g_critical("failed to daemonize");
514 exit(EXIT_FAILURE);
515 #endif
518 static int send_response(GAState *s, QObject *payload)
520 const char *buf;
521 QString *payload_qstr, *response_qstr;
522 GIOStatus status;
524 g_assert(payload && s->channel);
526 payload_qstr = qobject_to_json(payload);
527 if (!payload_qstr) {
528 return -EINVAL;
531 if (s->delimit_response) {
532 s->delimit_response = false;
533 response_qstr = qstring_new();
534 qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
535 qstring_append(response_qstr, qstring_get_str(payload_qstr));
536 QDECREF(payload_qstr);
537 } else {
538 response_qstr = payload_qstr;
541 qstring_append_chr(response_qstr, '\n');
542 buf = qstring_get_str(response_qstr);
543 status = ga_channel_write_all(s->channel, buf, strlen(buf));
544 QDECREF(response_qstr);
545 if (status != G_IO_STATUS_NORMAL) {
546 return -EIO;
549 return 0;
552 static void process_command(GAState *s, QDict *req)
554 QObject *rsp = NULL;
555 int ret;
557 g_assert(req);
558 g_debug("processing command");
559 rsp = qmp_dispatch(QOBJECT(req));
560 if (rsp) {
561 ret = send_response(s, rsp);
562 if (ret) {
563 g_warning("error sending response: %s", strerror(ret));
565 qobject_decref(rsp);
569 /* handle requests/control events coming in over the channel */
570 static void process_event(JSONMessageParser *parser, GQueue *tokens)
572 GAState *s = container_of(parser, GAState, parser);
573 QDict *qdict;
574 Error *err = NULL;
575 int ret;
577 g_assert(s && parser);
579 g_debug("process_event: called");
580 qdict = qobject_to_qdict(json_parser_parse_err(tokens, NULL, &err));
581 if (err || !qdict) {
582 QDECREF(qdict);
583 qdict = qdict_new();
584 if (!err) {
585 g_warning("failed to parse event: unknown error");
586 error_setg(&err, QERR_JSON_PARSING);
587 } else {
588 g_warning("failed to parse event: %s", error_get_pretty(err));
590 qdict_put_obj(qdict, "error", qmp_build_error_object(err));
591 error_free(err);
594 /* handle host->guest commands */
595 if (qdict_haskey(qdict, "execute")) {
596 process_command(s, qdict);
597 } else {
598 if (!qdict_haskey(qdict, "error")) {
599 QDECREF(qdict);
600 qdict = qdict_new();
601 g_warning("unrecognized payload format");
602 error_setg(&err, QERR_UNSUPPORTED);
603 qdict_put_obj(qdict, "error", qmp_build_error_object(err));
604 error_free(err);
606 ret = send_response(s, QOBJECT(qdict));
607 if (ret < 0) {
608 g_warning("error sending error response: %s", strerror(-ret));
612 QDECREF(qdict);
615 /* false return signals GAChannel to close the current client connection */
616 static gboolean channel_event_cb(GIOCondition condition, gpointer data)
618 GAState *s = data;
619 gchar buf[QGA_READ_COUNT_DEFAULT+1];
620 gsize count;
621 GError *err = NULL;
622 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count);
623 if (err != NULL) {
624 g_warning("error reading channel: %s", err->message);
625 g_error_free(err);
626 return false;
628 switch (status) {
629 case G_IO_STATUS_ERROR:
630 g_warning("error reading channel");
631 return false;
632 case G_IO_STATUS_NORMAL:
633 buf[count] = 0;
634 g_debug("read data, count: %d, data: %s", (int)count, buf);
635 json_message_parser_feed(&s->parser, (char *)buf, (int)count);
636 break;
637 case G_IO_STATUS_EOF:
638 g_debug("received EOF");
639 if (!s->virtio) {
640 return false;
642 /* fall through */
643 case G_IO_STATUS_AGAIN:
644 /* virtio causes us to spin here when no process is attached to
645 * host-side chardev. sleep a bit to mitigate this
647 if (s->virtio) {
648 usleep(100*1000);
650 return true;
651 default:
652 g_warning("unknown channel read status, closing");
653 return false;
655 return true;
658 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path)
660 GAChannelMethod channel_method;
662 if (strcmp(method, "virtio-serial") == 0) {
663 s->virtio = true; /* virtio requires special handling in some cases */
664 channel_method = GA_CHANNEL_VIRTIO_SERIAL;
665 } else if (strcmp(method, "isa-serial") == 0) {
666 channel_method = GA_CHANNEL_ISA_SERIAL;
667 } else if (strcmp(method, "unix-listen") == 0) {
668 channel_method = GA_CHANNEL_UNIX_LISTEN;
669 } else {
670 g_critical("unsupported channel method/type: %s", method);
671 return false;
674 s->channel = ga_channel_new(channel_method, path, channel_event_cb, s);
675 if (!s->channel) {
676 g_critical("failed to create guest agent channel");
677 return false;
680 return true;
683 #ifdef _WIN32
684 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
685 LPVOID ctx)
687 DWORD ret = NO_ERROR;
688 GAService *service = &ga_state->service;
690 switch (ctrl)
692 case SERVICE_CONTROL_STOP:
693 case SERVICE_CONTROL_SHUTDOWN:
694 quit_handler(SIGTERM);
695 service->status.dwCurrentState = SERVICE_STOP_PENDING;
696 SetServiceStatus(service->status_handle, &service->status);
697 break;
699 default:
700 ret = ERROR_CALL_NOT_IMPLEMENTED;
702 return ret;
705 VOID WINAPI service_main(DWORD argc, TCHAR *argv[])
707 GAService *service = &ga_state->service;
709 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME,
710 service_ctrl_handler, NULL);
712 if (service->status_handle == 0) {
713 g_critical("Failed to register extended requests function!\n");
714 return;
717 service->status.dwServiceType = SERVICE_WIN32;
718 service->status.dwCurrentState = SERVICE_RUNNING;
719 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
720 service->status.dwWin32ExitCode = NO_ERROR;
721 service->status.dwServiceSpecificExitCode = NO_ERROR;
722 service->status.dwCheckPoint = 0;
723 service->status.dwWaitHint = 0;
724 SetServiceStatus(service->status_handle, &service->status);
726 g_main_loop_run(ga_state->main_loop);
728 service->status.dwCurrentState = SERVICE_STOPPED;
729 SetServiceStatus(service->status_handle, &service->status);
731 #endif
733 static void set_persistent_state_defaults(GAPersistentState *pstate)
735 g_assert(pstate);
736 pstate->fd_counter = QGA_PSTATE_DEFAULT_FD_COUNTER;
739 static void persistent_state_from_keyfile(GAPersistentState *pstate,
740 GKeyFile *keyfile)
742 g_assert(pstate);
743 g_assert(keyfile);
744 /* if any fields are missing, either because the file was tampered with
745 * by agents of chaos, or because the field wasn't present at the time the
746 * file was created, the best we can ever do is start over with the default
747 * values. so load them now, and ignore any errors in accessing key-value
748 * pairs
750 set_persistent_state_defaults(pstate);
752 if (g_key_file_has_key(keyfile, "global", "fd_counter", NULL)) {
753 pstate->fd_counter =
754 g_key_file_get_integer(keyfile, "global", "fd_counter", NULL);
758 static void persistent_state_to_keyfile(const GAPersistentState *pstate,
759 GKeyFile *keyfile)
761 g_assert(pstate);
762 g_assert(keyfile);
764 g_key_file_set_integer(keyfile, "global", "fd_counter", pstate->fd_counter);
767 static gboolean write_persistent_state(const GAPersistentState *pstate,
768 const gchar *path)
770 GKeyFile *keyfile = g_key_file_new();
771 GError *gerr = NULL;
772 gboolean ret = true;
773 gchar *data = NULL;
774 gsize data_len;
776 g_assert(pstate);
778 persistent_state_to_keyfile(pstate, keyfile);
779 data = g_key_file_to_data(keyfile, &data_len, &gerr);
780 if (gerr) {
781 g_critical("failed to convert persistent state to string: %s",
782 gerr->message);
783 ret = false;
784 goto out;
787 g_file_set_contents(path, data, data_len, &gerr);
788 if (gerr) {
789 g_critical("failed to write persistent state to %s: %s",
790 path, gerr->message);
791 ret = false;
792 goto out;
795 out:
796 if (gerr) {
797 g_error_free(gerr);
799 if (keyfile) {
800 g_key_file_free(keyfile);
802 g_free(data);
803 return ret;
806 static gboolean read_persistent_state(GAPersistentState *pstate,
807 const gchar *path, gboolean frozen)
809 GKeyFile *keyfile = NULL;
810 GError *gerr = NULL;
811 struct stat st;
812 gboolean ret = true;
814 g_assert(pstate);
816 if (stat(path, &st) == -1) {
817 /* it's okay if state file doesn't exist, but any other error
818 * indicates a permissions issue or some other misconfiguration
819 * that we likely won't be able to recover from.
821 if (errno != ENOENT) {
822 g_critical("unable to access state file at path %s: %s",
823 path, strerror(errno));
824 ret = false;
825 goto out;
828 /* file doesn't exist. initialize state to default values and
829 * attempt to save now. (we could wait till later when we have
830 * modified state we need to commit, but if there's a problem,
831 * such as a missing parent directory, we want to catch it now)
833 * there is a potential scenario where someone either managed to
834 * update the agent from a version that didn't use a key store
835 * while qemu-ga thought the filesystem was frozen, or
836 * deleted the key store prior to issuing a fsfreeze, prior
837 * to restarting the agent. in this case we go ahead and defer
838 * initial creation till we actually have modified state to
839 * write, otherwise fail to recover from freeze.
841 set_persistent_state_defaults(pstate);
842 if (!frozen) {
843 ret = write_persistent_state(pstate, path);
844 if (!ret) {
845 g_critical("unable to create state file at path %s", path);
846 ret = false;
847 goto out;
850 ret = true;
851 goto out;
854 keyfile = g_key_file_new();
855 g_key_file_load_from_file(keyfile, path, 0, &gerr);
856 if (gerr) {
857 g_critical("error loading persistent state from path: %s, %s",
858 path, gerr->message);
859 ret = false;
860 goto out;
863 persistent_state_from_keyfile(pstate, keyfile);
865 out:
866 if (keyfile) {
867 g_key_file_free(keyfile);
869 if (gerr) {
870 g_error_free(gerr);
873 return ret;
876 int64_t ga_get_fd_handle(GAState *s, Error **errp)
878 int64_t handle;
880 g_assert(s->pstate_filepath);
881 /* we blacklist commands and avoid operations that potentially require
882 * writing to disk when we're in a frozen state. this includes opening
883 * new files, so we should never get here in that situation
885 g_assert(!ga_is_frozen(s));
887 handle = s->pstate.fd_counter++;
889 /* This should never happen on a reasonable timeframe, as guest-file-open
890 * would have to be issued 2^63 times */
891 if (s->pstate.fd_counter == INT64_MAX) {
892 abort();
895 if (!write_persistent_state(&s->pstate, s->pstate_filepath)) {
896 error_setg(errp, "failed to commit persistent state to disk");
897 return -1;
900 return handle;
903 static void ga_print_cmd(QmpCommand *cmd, void *opaque)
905 printf("%s\n", qmp_command_name(cmd));
908 static GList *split_list(const gchar *str, const gchar *delim)
910 GList *list = NULL;
911 int i;
912 gchar **strv;
914 strv = g_strsplit(str, delim, -1);
915 for (i = 0; strv[i]; i++) {
916 list = g_list_prepend(list, strv[i]);
918 g_free(strv);
920 return list;
923 typedef struct GAConfig {
924 char *channel_path;
925 char *method;
926 char *log_filepath;
927 char *pid_filepath;
928 #ifdef CONFIG_FSFREEZE
929 char *fsfreeze_hook;
930 #endif
931 char *state_dir;
932 #ifdef _WIN32
933 const char *service;
934 #endif
935 gchar *bliststr; /* blacklist may point to this string */
936 GList *blacklist;
937 int daemonize;
938 GLogLevelFlags log_level;
939 int dumpconf;
940 } GAConfig;
942 static void config_load(GAConfig *config)
944 GError *gerr = NULL;
945 GKeyFile *keyfile;
946 const char *conf = g_getenv("QGA_CONF") ?: QGA_CONF_DEFAULT;
948 /* read system config */
949 keyfile = g_key_file_new();
950 if (!g_key_file_load_from_file(keyfile, conf, 0, &gerr)) {
951 goto end;
953 if (g_key_file_has_key(keyfile, "general", "daemon", NULL)) {
954 config->daemonize =
955 g_key_file_get_boolean(keyfile, "general", "daemon", &gerr);
957 if (g_key_file_has_key(keyfile, "general", "method", NULL)) {
958 config->method =
959 g_key_file_get_string(keyfile, "general", "method", &gerr);
961 if (g_key_file_has_key(keyfile, "general", "path", NULL)) {
962 config->channel_path =
963 g_key_file_get_string(keyfile, "general", "path", &gerr);
965 if (g_key_file_has_key(keyfile, "general", "logfile", NULL)) {
966 config->log_filepath =
967 g_key_file_get_string(keyfile, "general", "logfile", &gerr);
969 if (g_key_file_has_key(keyfile, "general", "pidfile", NULL)) {
970 config->pid_filepath =
971 g_key_file_get_string(keyfile, "general", "pidfile", &gerr);
973 #ifdef CONFIG_FSFREEZE
974 if (g_key_file_has_key(keyfile, "general", "fsfreeze-hook", NULL)) {
975 config->fsfreeze_hook =
976 g_key_file_get_string(keyfile,
977 "general", "fsfreeze-hook", &gerr);
979 #endif
980 if (g_key_file_has_key(keyfile, "general", "statedir", NULL)) {
981 config->state_dir =
982 g_key_file_get_string(keyfile, "general", "statedir", &gerr);
984 if (g_key_file_has_key(keyfile, "general", "verbose", NULL) &&
985 g_key_file_get_boolean(keyfile, "general", "verbose", &gerr)) {
986 /* enable all log levels */
987 config->log_level = G_LOG_LEVEL_MASK;
989 if (g_key_file_has_key(keyfile, "general", "blacklist", NULL)) {
990 config->bliststr =
991 g_key_file_get_string(keyfile, "general", "blacklist", &gerr);
992 config->blacklist = g_list_concat(config->blacklist,
993 split_list(config->bliststr, ","));
996 end:
997 g_key_file_free(keyfile);
998 if (gerr &&
999 !(gerr->domain == G_FILE_ERROR && gerr->code == G_FILE_ERROR_NOENT)) {
1000 g_critical("error loading configuration from path: %s, %s",
1001 QGA_CONF_DEFAULT, gerr->message);
1002 exit(EXIT_FAILURE);
1004 g_clear_error(&gerr);
1007 static gchar *list_join(GList *list, const gchar separator)
1009 GString *str = g_string_new("");
1011 while (list) {
1012 str = g_string_append(str, (gchar *)list->data);
1013 list = g_list_next(list);
1014 if (list) {
1015 str = g_string_append_c(str, separator);
1019 return g_string_free(str, FALSE);
1022 static void config_dump(GAConfig *config)
1024 GError *error = NULL;
1025 GKeyFile *keyfile;
1026 gchar *tmp;
1028 keyfile = g_key_file_new();
1029 g_assert(keyfile);
1031 g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
1032 g_key_file_set_string(keyfile, "general", "method", config->method);
1033 g_key_file_set_string(keyfile, "general", "path", config->channel_path);
1034 if (config->log_filepath) {
1035 g_key_file_set_string(keyfile, "general", "logfile",
1036 config->log_filepath);
1038 g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
1039 #ifdef CONFIG_FSFREEZE
1040 if (config->fsfreeze_hook) {
1041 g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
1042 config->fsfreeze_hook);
1044 #endif
1045 g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
1046 g_key_file_set_boolean(keyfile, "general", "verbose",
1047 config->log_level == G_LOG_LEVEL_MASK);
1048 tmp = list_join(config->blacklist, ',');
1049 g_key_file_set_string(keyfile, "general", "blacklist", tmp);
1050 g_free(tmp);
1052 tmp = g_key_file_to_data(keyfile, NULL, &error);
1053 printf("%s", tmp);
1055 g_free(tmp);
1056 g_key_file_free(keyfile);
1059 static void config_parse(GAConfig *config, int argc, char **argv)
1061 const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
1062 int opt_ind = 0, ch;
1063 const struct option lopt[] = {
1064 { "help", 0, NULL, 'h' },
1065 { "version", 0, NULL, 'V' },
1066 { "dump-conf", 0, NULL, 'D' },
1067 { "logfile", 1, NULL, 'l' },
1068 { "pidfile", 1, NULL, 'f' },
1069 #ifdef CONFIG_FSFREEZE
1070 { "fsfreeze-hook", 2, NULL, 'F' },
1071 #endif
1072 { "verbose", 0, NULL, 'v' },
1073 { "method", 1, NULL, 'm' },
1074 { "path", 1, NULL, 'p' },
1075 { "daemonize", 0, NULL, 'd' },
1076 { "blacklist", 1, NULL, 'b' },
1077 #ifdef _WIN32
1078 { "service", 1, NULL, 's' },
1079 #endif
1080 { "statedir", 1, NULL, 't' },
1081 { NULL, 0, NULL, 0 }
1084 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
1085 switch (ch) {
1086 case 'm':
1087 g_free(config->method);
1088 config->method = g_strdup(optarg);
1089 break;
1090 case 'p':
1091 g_free(config->channel_path);
1092 config->channel_path = g_strdup(optarg);
1093 break;
1094 case 'l':
1095 g_free(config->log_filepath);
1096 config->log_filepath = g_strdup(optarg);
1097 break;
1098 case 'f':
1099 g_free(config->pid_filepath);
1100 config->pid_filepath = g_strdup(optarg);
1101 break;
1102 #ifdef CONFIG_FSFREEZE
1103 case 'F':
1104 g_free(config->fsfreeze_hook);
1105 config->fsfreeze_hook = g_strdup(optarg ?: QGA_FSFREEZE_HOOK_DEFAULT);
1106 break;
1107 #endif
1108 case 't':
1109 g_free(config->state_dir);
1110 config->state_dir = g_strdup(optarg);
1111 break;
1112 case 'v':
1113 /* enable all log levels */
1114 config->log_level = G_LOG_LEVEL_MASK;
1115 break;
1116 case 'V':
1117 printf("QEMU Guest Agent %s\n", QEMU_VERSION);
1118 exit(EXIT_SUCCESS);
1119 case 'd':
1120 config->daemonize = 1;
1121 break;
1122 case 'D':
1123 config->dumpconf = 1;
1124 break;
1125 case 'b': {
1126 if (is_help_option(optarg)) {
1127 qmp_for_each_command(ga_print_cmd, NULL);
1128 exit(EXIT_SUCCESS);
1130 config->blacklist = g_list_concat(config->blacklist,
1131 split_list(optarg, ","));
1132 break;
1134 #ifdef _WIN32
1135 case 's':
1136 config->service = optarg;
1137 if (strcmp(config->service, "install") == 0) {
1138 if (ga_install_vss_provider()) {
1139 exit(EXIT_FAILURE);
1141 if (ga_install_service(config->channel_path,
1142 config->log_filepath, config->state_dir)) {
1143 exit(EXIT_FAILURE);
1145 exit(EXIT_SUCCESS);
1146 } else if (strcmp(config->service, "uninstall") == 0) {
1147 ga_uninstall_vss_provider();
1148 exit(ga_uninstall_service());
1149 } else if (strcmp(config->service, "vss-install") == 0) {
1150 if (ga_install_vss_provider()) {
1151 exit(EXIT_FAILURE);
1153 exit(EXIT_SUCCESS);
1154 } else if (strcmp(config->service, "vss-uninstall") == 0) {
1155 ga_uninstall_vss_provider();
1156 exit(EXIT_SUCCESS);
1157 } else {
1158 printf("Unknown service command.\n");
1159 exit(EXIT_FAILURE);
1161 break;
1162 #endif
1163 case 'h':
1164 usage(argv[0]);
1165 exit(EXIT_SUCCESS);
1166 case '?':
1167 g_print("Unknown option, try '%s --help' for more information.\n",
1168 argv[0]);
1169 exit(EXIT_FAILURE);
1174 static void config_free(GAConfig *config)
1176 g_free(config->method);
1177 g_free(config->log_filepath);
1178 g_free(config->pid_filepath);
1179 g_free(config->state_dir);
1180 g_free(config->channel_path);
1181 g_free(config->bliststr);
1182 #ifdef CONFIG_FSFREEZE
1183 g_free(config->fsfreeze_hook);
1184 #endif
1185 g_free(config);
1188 static bool check_is_frozen(GAState *s)
1190 #ifndef _WIN32
1191 /* check if a previous instance of qemu-ga exited with filesystems' state
1192 * marked as frozen. this could be a stale value (a non-qemu-ga process
1193 * or reboot may have since unfrozen them), but better to require an
1194 * uneeded unfreeze than to risk hanging on start-up
1196 struct stat st;
1197 if (stat(s->state_filepath_isfrozen, &st) == -1) {
1198 /* it's okay if the file doesn't exist, but if we can't access for
1199 * some other reason, such as permissions, there's a configuration
1200 * that needs to be addressed. so just bail now before we get into
1201 * more trouble later
1203 if (errno != ENOENT) {
1204 g_critical("unable to access state file at path %s: %s",
1205 s->state_filepath_isfrozen, strerror(errno));
1206 return EXIT_FAILURE;
1208 } else {
1209 g_warning("previous instance appears to have exited with frozen"
1210 " filesystems. deferring logging/pidfile creation and"
1211 " disabling non-fsfreeze-safe commands until"
1212 " guest-fsfreeze-thaw is issued, or filesystems are"
1213 " manually unfrozen and the file %s is removed",
1214 s->state_filepath_isfrozen);
1215 return true;
1217 #endif
1218 return false;
1221 static int run_agent(GAState *s, GAConfig *config)
1223 ga_state = s;
1225 g_log_set_default_handler(ga_log, s);
1226 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
1227 ga_enable_logging(s);
1229 #ifdef _WIN32
1230 /* On win32 the state directory is application specific (be it the default
1231 * or a user override). We got past the command line parsing; let's create
1232 * the directory (with any intermediate directories). If we run into an
1233 * error later on, we won't try to clean up the directory, it is considered
1234 * persistent.
1236 if (g_mkdir_with_parents(config->state_dir, S_IRWXU) == -1) {
1237 g_critical("unable to create (an ancestor of) the state directory"
1238 " '%s': %s", config->state_dir, strerror(errno));
1239 return EXIT_FAILURE;
1241 #endif
1243 if (ga_is_frozen(s)) {
1244 if (config->daemonize) {
1245 /* delay opening/locking of pidfile till filesystems are unfrozen */
1246 s->deferred_options.pid_filepath = config->pid_filepath;
1247 become_daemon(NULL);
1249 if (config->log_filepath) {
1250 /* delay opening the log file till filesystems are unfrozen */
1251 s->deferred_options.log_filepath = config->log_filepath;
1253 ga_disable_logging(s);
1254 qmp_for_each_command(ga_disable_non_whitelisted, NULL);
1255 } else {
1256 if (config->daemonize) {
1257 become_daemon(config->pid_filepath);
1259 if (config->log_filepath) {
1260 FILE *log_file = ga_open_logfile(config->log_filepath);
1261 if (!log_file) {
1262 g_critical("unable to open specified log file: %s",
1263 strerror(errno));
1264 return EXIT_FAILURE;
1266 s->log_file = log_file;
1270 /* load persistent state from disk */
1271 if (!read_persistent_state(&s->pstate,
1272 s->pstate_filepath,
1273 ga_is_frozen(s))) {
1274 g_critical("failed to load persistent state");
1275 return EXIT_FAILURE;
1278 config->blacklist = ga_command_blacklist_init(config->blacklist);
1279 if (config->blacklist) {
1280 GList *l = config->blacklist;
1281 s->blacklist = config->blacklist;
1282 do {
1283 g_debug("disabling command: %s", (char *)l->data);
1284 qmp_disable_command(l->data);
1285 l = g_list_next(l);
1286 } while (l);
1288 s->command_state = ga_command_state_new();
1289 ga_command_state_init(s, s->command_state);
1290 ga_command_state_init_all(s->command_state);
1291 json_message_parser_init(&s->parser, process_event);
1292 ga_state = s;
1293 #ifndef _WIN32
1294 if (!register_signal_handlers()) {
1295 g_critical("failed to register signal handlers");
1296 return EXIT_FAILURE;
1298 #endif
1300 s->main_loop = g_main_loop_new(NULL, false);
1301 if (!channel_init(ga_state, config->method, config->channel_path)) {
1302 g_critical("failed to initialize guest agent channel");
1303 return EXIT_FAILURE;
1305 #ifndef _WIN32
1306 g_main_loop_run(ga_state->main_loop);
1307 #else
1308 if (config->daemonize) {
1309 SERVICE_TABLE_ENTRY service_table[] = {
1310 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } };
1311 StartServiceCtrlDispatcher(service_table);
1312 } else {
1313 g_main_loop_run(ga_state->main_loop);
1315 #endif
1317 return EXIT_SUCCESS;
1320 static void free_blacklist_entry(gpointer entry, gpointer unused)
1322 g_free(entry);
1325 int main(int argc, char **argv)
1327 int ret = EXIT_SUCCESS;
1328 GAState *s = g_new0(GAState, 1);
1329 GAConfig *config = g_new0(GAConfig, 1);
1331 config->log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
1333 module_call_init(MODULE_INIT_QAPI);
1335 init_dfl_pathnames();
1336 config_load(config);
1337 config_parse(config, argc, argv);
1339 if (config->pid_filepath == NULL) {
1340 config->pid_filepath = g_strdup(dfl_pathnames.pidfile);
1343 if (config->state_dir == NULL) {
1344 config->state_dir = g_strdup(dfl_pathnames.state_dir);
1347 if (config->method == NULL) {
1348 config->method = g_strdup("virtio-serial");
1351 if (config->channel_path == NULL) {
1352 if (strcmp(config->method, "virtio-serial") == 0) {
1353 /* try the default path for the virtio-serial port */
1354 config->channel_path = g_strdup(QGA_VIRTIO_PATH_DEFAULT);
1355 } else if (strcmp(config->method, "isa-serial") == 0) {
1356 /* try the default path for the serial port - COM1 */
1357 config->channel_path = g_strdup(QGA_SERIAL_PATH_DEFAULT);
1358 } else {
1359 g_critical("must specify a path for this channel");
1360 ret = EXIT_FAILURE;
1361 goto end;
1365 s->log_level = config->log_level;
1366 s->log_file = stderr;
1367 #ifdef CONFIG_FSFREEZE
1368 s->fsfreeze_hook = config->fsfreeze_hook;
1369 #endif
1370 s->pstate_filepath = g_strdup_printf("%s/qga.state", config->state_dir);
1371 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen",
1372 config->state_dir);
1373 s->frozen = check_is_frozen(s);
1375 if (config->dumpconf) {
1376 config_dump(config);
1377 goto end;
1380 ret = run_agent(s, config);
1382 end:
1383 if (s->command_state) {
1384 ga_command_state_cleanup_all(s->command_state);
1386 if (s->channel) {
1387 ga_channel_free(s->channel);
1389 g_list_foreach(config->blacklist, free_blacklist_entry, NULL);
1390 g_free(s->pstate_filepath);
1391 g_free(s->state_filepath_isfrozen);
1393 if (config->daemonize) {
1394 unlink(config->pid_filepath);
1397 config_free(config);
1399 return ret;