1 /* 2 * QEMU Guest Agent 3 * 4 * Copyright IBM Corp. 2011 5 * 6 * Authors: 7 * Adam Litke <aglitke@linux.vnet.ibm.com> 8 * Michael Roth <mdroth@linux.vnet.ibm.com> 9 * 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. 12 */ 13 #include <stdlib.h> 14 #include <stdio.h> 15 #include <stdbool.h> 16 #include <glib.h> 17 #include <getopt.h> 18 #ifndef _WIN32 19 #include <syslog.h> 20 #include <sys/wait.h> 21 #include <sys/stat.h> 22 #endif 23 #include "qapi/qmp/json-streamer.h" 24 #include "qapi/qmp/json-parser.h" 25 #include "qapi/qmp/qint.h" 26 #include "qapi/qmp/qjson.h" 27 #include "qga/guest-agent-core.h" 28 #include "module.h" 29 #include "signal.h" 30 #include "qapi/qmp/qerror.h" 31 #include "qapi/qmp/dispatch.h" 32 #include "qga/channel.h" 33 #ifdef _WIN32 34 #include "qga/service-win32.h" 35 #include <windows.h> 36 #endif 37 38 #ifndef _WIN32 39 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0" 40 #else 41 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0" 42 #endif 43 #define QGA_STATEDIR_DEFAULT CONFIG_QEMU_LOCALSTATEDIR "/run" 44 #define QGA_PIDFILE_DEFAULT QGA_STATEDIR_DEFAULT "/qemu-ga.pid" 45 #define QGA_SENTINEL_BYTE 0xFF 46 47 struct GAState { 48 JSONMessageParser parser; 49 GMainLoop *main_loop; 50 GAChannel *channel; 51 bool virtio; /* fastpath to check for virtio to deal with poll() quirks */ 52 GACommandState *command_state; 53 GLogLevelFlags log_level; 54 FILE *log_file; 55 bool logging_enabled; 56 #ifdef _WIN32 57 GAService service; 58 #endif 59 bool delimit_response; 60 bool frozen; 61 GList *blacklist; 62 const char *state_filepath_isfrozen; 63 struct { 64 const char *log_filepath; 65 const char *pid_filepath; 66 } deferred_options; 67 }; 68 69 struct GAState *ga_state; 70 71 /* commands that are safe to issue while filesystems are frozen */ 72 static const char *ga_freeze_whitelist[] = { 73 "guest-ping", 74 "guest-info", 75 "guest-sync", 76 "guest-fsfreeze-status", 77 "guest-fsfreeze-thaw", 78 NULL 79 }; 80 81 #ifdef _WIN32 82 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data, 83 LPVOID ctx); 84 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]); 85 #endif 86 87 static void quit_handler(int sig) 88 { 89 /* if we're frozen, don't exit unless we're absolutely forced to, 90 * because it's basically impossible for graceful exit to complete 91 * unless all log/pid files are on unfreezable filesystems. there's 92 * also a very likely chance killing the agent before unfreezing 93 * the filesystems is a mistake (or will be viewed as one later). 94 */ 95 if (ga_is_frozen(ga_state)) { 96 return; 97 } 98 g_debug("received signal num %d, quitting", sig); 99 100 if (g_main_loop_is_running(ga_state->main_loop)) { 101 g_main_loop_quit(ga_state->main_loop); 102 } 103 } 104 105 #ifndef _WIN32 106 static gboolean register_signal_handlers(void) 107 { 108 struct sigaction sigact; 109 int ret; 110 111 memset(&sigact, 0, sizeof(struct sigaction)); 112 sigact.sa_handler = quit_handler; 113 114 ret = sigaction(SIGINT, &sigact, NULL); 115 if (ret == -1) { 116 g_error("error configuring signal handler: %s", strerror(errno)); 117 } 118 ret = sigaction(SIGTERM, &sigact, NULL); 119 if (ret == -1) { 120 g_error("error configuring signal handler: %s", strerror(errno)); 121 } 122 123 return true; 124 } 125 126 /* TODO: use this in place of all post-fork() fclose(std*) callers */ 127 void reopen_fd_to_null(int fd) 128 { 129 int nullfd; 130 131 nullfd = open("/dev/null", O_RDWR); 132 if (nullfd < 0) { 133 return; 134 } 135 136 dup2(nullfd, fd); 137 138 if (nullfd != fd) { 139 close(nullfd); 140 } 141 } 142 #endif 143 144 static void usage(const char *cmd) 145 { 146 printf( 147 "Usage: %s [-m <method> -p <path>] [<options>]\n" 148 "QEMU Guest Agent %s\n" 149 "\n" 150 " -m, --method transport method: one of unix-listen, virtio-serial, or\n" 151 " isa-serial (virtio-serial is the default)\n" 152 " -p, --path device/socket path (the default for virtio-serial is:\n" 153 " %s)\n" 154 " -l, --logfile set logfile path, logs to stderr by default\n" 155 " -f, --pidfile specify pidfile (default is %s)\n" 156 " -t, --statedir specify dir to store state information (absolute paths\n" 157 " only, default is %s)\n" 158 " -v, --verbose log extra debugging information\n" 159 " -V, --version print version information and exit\n" 160 " -d, --daemonize become a daemon\n" 161 #ifdef _WIN32 162 " -s, --service service commands: install, uninstall\n" 163 #endif 164 " -b, --blacklist comma-separated list of RPCs to disable (no spaces, \"?\"\n" 165 " to list available RPCs)\n" 166 " -h, --help display this help and exit\n" 167 "\n" 168 "Report bugs to <mdroth@linux.vnet.ibm.com>\n" 169 , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_PIDFILE_DEFAULT, 170 QGA_STATEDIR_DEFAULT); 171 } 172 173 static const char *ga_log_level_str(GLogLevelFlags level) 174 { 175 switch (level & G_LOG_LEVEL_MASK) { 176 case G_LOG_LEVEL_ERROR: 177 return "error"; 178 case G_LOG_LEVEL_CRITICAL: 179 return "critical"; 180 case G_LOG_LEVEL_WARNING: 181 return "warning"; 182 case G_LOG_LEVEL_MESSAGE: 183 return "message"; 184 case G_LOG_LEVEL_INFO: 185 return "info"; 186 case G_LOG_LEVEL_DEBUG: 187 return "debug"; 188 default: 189 return "user"; 190 } 191 } 192 193 bool ga_logging_enabled(GAState *s) 194 { 195 return s->logging_enabled; 196 } 197 198 void ga_disable_logging(GAState *s) 199 { 200 s->logging_enabled = false; 201 } 202 203 void ga_enable_logging(GAState *s) 204 { 205 s->logging_enabled = true; 206 } 207 208 static void ga_log(const gchar *domain, GLogLevelFlags level, 209 const gchar *msg, gpointer opaque) 210 { 211 GAState *s = opaque; 212 GTimeVal time; 213 const char *level_str = ga_log_level_str(level); 214 215 if (!ga_logging_enabled(s)) { 216 return; 217 } 218 219 level &= G_LOG_LEVEL_MASK; 220 #ifndef _WIN32 221 if (domain && strcmp(domain, "syslog") == 0) { 222 syslog(LOG_INFO, "%s: %s", level_str, msg); 223 } else if (level & s->log_level) { 224 #else 225 if (level & s->log_level) { 226 #endif 227 g_get_current_time(&time); 228 fprintf(s->log_file, 229 "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg); 230 fflush(s->log_file); 231 } 232 } 233 234 void ga_set_response_delimited(GAState *s) 235 { 236 s->delimit_response = true; 237 } 238 239 #ifndef _WIN32 240 static bool ga_open_pidfile(const char *pidfile) 241 { 242 int pidfd; 243 char pidstr[32]; 244 245 pidfd = open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR); 246 if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) { 247 g_critical("Cannot lock pid file, %s", strerror(errno)); 248 if (pidfd != -1) { 249 close(pidfd); 250 } 251 return false; 252 } 253 254 if (ftruncate(pidfd, 0) || lseek(pidfd, 0, SEEK_SET)) { 255 g_critical("Failed to truncate pid file"); 256 goto fail; 257 } 258 snprintf(pidstr, sizeof(pidstr), "%d\n", getpid()); 259 if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) { 260 g_critical("Failed to write pid file"); 261 goto fail; 262 } 263 264 return true; 265 266 fail: 267 unlink(pidfile); 268 return false; 269 } 270 #else /* _WIN32 */ 271 static bool ga_open_pidfile(const char *pidfile) 272 { 273 return true; 274 } 275 #endif 276 277 static gint ga_strcmp(gconstpointer str1, gconstpointer str2) 278 { 279 return strcmp(str1, str2); 280 } 281 282 /* disable commands that aren't safe for fsfreeze */ 283 static void ga_disable_non_whitelisted(void) 284 { 285 char **list_head, **list; 286 bool whitelisted; 287 int i; 288 289 list_head = list = qmp_get_command_list(); 290 while (*list != NULL) { 291 whitelisted = false; 292 i = 0; 293 while (ga_freeze_whitelist[i] != NULL) { 294 if (strcmp(*list, ga_freeze_whitelist[i]) == 0) { 295 whitelisted = true; 296 } 297 i++; 298 } 299 if (!whitelisted) { 300 g_debug("disabling command: %s", *list); 301 qmp_disable_command(*list); 302 } 303 g_free(*list); 304 list++; 305 } 306 g_free(list_head); 307 } 308 309 /* [re-]enable all commands, except those explicitly blacklisted by user */ 310 static void ga_enable_non_blacklisted(GList *blacklist) 311 { 312 char **list_head, **list; 313 314 list_head = list = qmp_get_command_list(); 315 while (*list != NULL) { 316 if (g_list_find_custom(blacklist, *list, ga_strcmp) == NULL && 317 !qmp_command_is_enabled(*list)) { 318 g_debug("enabling command: %s", *list); 319 qmp_enable_command(*list); 320 } 321 g_free(*list); 322 list++; 323 } 324 g_free(list_head); 325 } 326 327 static bool ga_create_file(const char *path) 328 { 329 int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR); 330 if (fd == -1) { 331 g_warning("unable to open/create file %s: %s", path, strerror(errno)); 332 return false; 333 } 334 close(fd); 335 return true; 336 } 337 338 static bool ga_delete_file(const char *path) 339 { 340 int ret = unlink(path); 341 if (ret == -1) { 342 g_warning("unable to delete file: %s: %s", path, strerror(errno)); 343 return false; 344 } 345 346 return true; 347 } 348 349 bool ga_is_frozen(GAState *s) 350 { 351 return s->frozen; 352 } 353 354 void ga_set_frozen(GAState *s) 355 { 356 if (ga_is_frozen(s)) { 357 return; 358 } 359 /* disable all non-whitelisted (for frozen state) commands */ 360 ga_disable_non_whitelisted(); 361 g_warning("disabling logging due to filesystem freeze"); 362 ga_disable_logging(s); 363 s->frozen = true; 364 if (!ga_create_file(s->state_filepath_isfrozen)) { 365 g_warning("unable to create %s, fsfreeze may not function properly", 366 s->state_filepath_isfrozen); 367 } 368 } 369 370 void ga_unset_frozen(GAState *s) 371 { 372 if (!ga_is_frozen(s)) { 373 return; 374 } 375 376 /* if we delayed creation/opening of pid/log files due to being 377 * in a frozen state at start up, do it now 378 */ 379 if (s->deferred_options.log_filepath) { 380 s->log_file = fopen(s->deferred_options.log_filepath, "a"); 381 if (!s->log_file) { 382 s->log_file = stderr; 383 } 384 s->deferred_options.log_filepath = NULL; 385 } 386 ga_enable_logging(s); 387 g_warning("logging re-enabled due to filesystem unfreeze"); 388 if (s->deferred_options.pid_filepath) { 389 if (!ga_open_pidfile(s->deferred_options.pid_filepath)) { 390 g_warning("failed to create/open pid file"); 391 } 392 s->deferred_options.pid_filepath = NULL; 393 } 394 395 /* enable all disabled, non-blacklisted commands */ 396 ga_enable_non_blacklisted(s->blacklist); 397 s->frozen = false; 398 if (!ga_delete_file(s->state_filepath_isfrozen)) { 399 g_warning("unable to delete %s, fsfreeze may not function properly", 400 s->state_filepath_isfrozen); 401 } 402 } 403 404 static void become_daemon(const char *pidfile) 405 { 406 #ifndef _WIN32 407 pid_t pid, sid; 408 409 pid = fork(); 410 if (pid < 0) { 411 exit(EXIT_FAILURE); 412 } 413 if (pid > 0) { 414 exit(EXIT_SUCCESS); 415 } 416 417 if (pidfile) { 418 if (!ga_open_pidfile(pidfile)) { 419 g_critical("failed to create pidfile"); 420 exit(EXIT_FAILURE); 421 } 422 } 423 424 umask(0); 425 sid = setsid(); 426 if (sid < 0) { 427 goto fail; 428 } 429 if ((chdir("/")) < 0) { 430 goto fail; 431 } 432 433 reopen_fd_to_null(STDIN_FILENO); 434 reopen_fd_to_null(STDOUT_FILENO); 435 reopen_fd_to_null(STDERR_FILENO); 436 return; 437 438 fail: 439 if (pidfile) { 440 unlink(pidfile); 441 } 442 g_critical("failed to daemonize"); 443 exit(EXIT_FAILURE); 444 #endif 445 } 446 447 static int send_response(GAState *s, QObject *payload) 448 { 449 const char *buf; 450 QString *payload_qstr, *response_qstr; 451 GIOStatus status; 452 453 g_assert(payload && s->channel); 454 455 payload_qstr = qobject_to_json(payload); 456 if (!payload_qstr) { 457 return -EINVAL; 458 } 459 460 if (s->delimit_response) { 461 s->delimit_response = false; 462 response_qstr = qstring_new(); 463 qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE); 464 qstring_append(response_qstr, qstring_get_str(payload_qstr)); 465 QDECREF(payload_qstr); 466 } else { 467 response_qstr = payload_qstr; 468 } 469 470 qstring_append_chr(response_qstr, '\n'); 471 buf = qstring_get_str(response_qstr); 472 status = ga_channel_write_all(s->channel, buf, strlen(buf)); 473 QDECREF(response_qstr); 474 if (status != G_IO_STATUS_NORMAL) { 475 return -EIO; 476 } 477 478 return 0; 479 } 480 481 static void process_command(GAState *s, QDict *req) 482 { 483 QObject *rsp = NULL; 484 int ret; 485 486 g_assert(req); 487 g_debug("processing command"); 488 rsp = qmp_dispatch(QOBJECT(req)); 489 if (rsp) { 490 ret = send_response(s, rsp); 491 if (ret) { 492 g_warning("error sending response: %s", strerror(ret)); 493 } 494 qobject_decref(rsp); 495 } 496 } 497 498 /* handle requests/control events coming in over the channel */ 499 static void process_event(JSONMessageParser *parser, QList *tokens) 500 { 501 GAState *s = container_of(parser, GAState, parser); 502 QObject *obj; 503 QDict *qdict; 504 Error *err = NULL; 505 int ret; 506 507 g_assert(s && parser); 508 509 g_debug("process_event: called"); 510 obj = json_parser_parse_err(tokens, NULL, &err); 511 if (err || !obj || qobject_type(obj) != QTYPE_QDICT) { 512 qobject_decref(obj); 513 qdict = qdict_new(); 514 if (!err) { 515 g_warning("failed to parse event: unknown error"); 516 error_set(&err, QERR_JSON_PARSING); 517 } else { 518 g_warning("failed to parse event: %s", error_get_pretty(err)); 519 } 520 qdict_put_obj(qdict, "error", qmp_build_error_object(err)); 521 error_free(err); 522 } else { 523 qdict = qobject_to_qdict(obj); 524 } 525 526 g_assert(qdict); 527 528 /* handle host->guest commands */ 529 if (qdict_haskey(qdict, "execute")) { 530 process_command(s, qdict); 531 } else { 532 if (!qdict_haskey(qdict, "error")) { 533 QDECREF(qdict); 534 qdict = qdict_new(); 535 g_warning("unrecognized payload format"); 536 error_set(&err, QERR_UNSUPPORTED); 537 qdict_put_obj(qdict, "error", qmp_build_error_object(err)); 538 error_free(err); 539 } 540 ret = send_response(s, QOBJECT(qdict)); 541 if (ret) { 542 g_warning("error sending error response: %s", strerror(ret)); 543 } 544 } 545 546 QDECREF(qdict); 547 } 548 549 /* false return signals GAChannel to close the current client connection */ 550 static gboolean channel_event_cb(GIOCondition condition, gpointer data) 551 { 552 GAState *s = data; 553 gchar buf[QGA_READ_COUNT_DEFAULT+1]; 554 gsize count; 555 GError *err = NULL; 556 GIOStatus status = ga_channel_read(s->channel, buf, QGA_READ_COUNT_DEFAULT, &count); 557 if (err != NULL) { 558 g_warning("error reading channel: %s", err->message); 559 g_error_free(err); 560 return false; 561 } 562 switch (status) { 563 case G_IO_STATUS_ERROR: 564 g_warning("error reading channel"); 565 return false; 566 case G_IO_STATUS_NORMAL: 567 buf[count] = 0; 568 g_debug("read data, count: %d, data: %s", (int)count, buf); 569 json_message_parser_feed(&s->parser, (char *)buf, (int)count); 570 break; 571 case G_IO_STATUS_EOF: 572 g_debug("received EOF"); 573 if (!s->virtio) { 574 return false; 575 } 576 case G_IO_STATUS_AGAIN: 577 /* virtio causes us to spin here when no process is attached to 578 * host-side chardev. sleep a bit to mitigate this 579 */ 580 if (s->virtio) { 581 usleep(100*1000); 582 } 583 return true; 584 default: 585 g_warning("unknown channel read status, closing"); 586 return false; 587 } 588 return true; 589 } 590 591 static gboolean channel_init(GAState *s, const gchar *method, const gchar *path) 592 { 593 GAChannelMethod channel_method; 594 595 if (method == NULL) { 596 method = "virtio-serial"; 597 } 598 599 if (path == NULL) { 600 if (strcmp(method, "virtio-serial") != 0) { 601 g_critical("must specify a path for this channel"); 602 return false; 603 } 604 /* try the default path for the virtio-serial port */ 605 path = QGA_VIRTIO_PATH_DEFAULT; 606 } 607 608 if (strcmp(method, "virtio-serial") == 0) { 609 s->virtio = true; /* virtio requires special handling in some cases */ 610 channel_method = GA_CHANNEL_VIRTIO_SERIAL; 611 } else if (strcmp(method, "isa-serial") == 0) { 612 channel_method = GA_CHANNEL_ISA_SERIAL; 613 } else if (strcmp(method, "unix-listen") == 0) { 614 channel_method = GA_CHANNEL_UNIX_LISTEN; 615 } else { 616 g_critical("unsupported channel method/type: %s", method); 617 return false; 618 } 619 620 s->channel = ga_channel_new(channel_method, path, channel_event_cb, s); 621 if (!s->channel) { 622 g_critical("failed to create guest agent channel"); 623 return false; 624 } 625 626 return true; 627 } 628 629 #ifdef _WIN32 630 DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data, 631 LPVOID ctx) 632 { 633 DWORD ret = NO_ERROR; 634 GAService *service = &ga_state->service; 635 636 switch (ctrl) 637 { 638 case SERVICE_CONTROL_STOP: 639 case SERVICE_CONTROL_SHUTDOWN: 640 quit_handler(SIGTERM); 641 service->status.dwCurrentState = SERVICE_STOP_PENDING; 642 SetServiceStatus(service->status_handle, &service->status); 643 break; 644 645 default: 646 ret = ERROR_CALL_NOT_IMPLEMENTED; 647 } 648 return ret; 649 } 650 651 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]) 652 { 653 GAService *service = &ga_state->service; 654 655 service->status_handle = RegisterServiceCtrlHandlerEx(QGA_SERVICE_NAME, 656 service_ctrl_handler, NULL); 657 658 if (service->status_handle == 0) { 659 g_critical("Failed to register extended requests function!\n"); 660 return; 661 } 662 663 service->status.dwServiceType = SERVICE_WIN32; 664 service->status.dwCurrentState = SERVICE_RUNNING; 665 service->status.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN; 666 service->status.dwWin32ExitCode = NO_ERROR; 667 service->status.dwServiceSpecificExitCode = NO_ERROR; 668 service->status.dwCheckPoint = 0; 669 service->status.dwWaitHint = 0; 670 SetServiceStatus(service->status_handle, &service->status); 671 672 g_main_loop_run(ga_state->main_loop); 673 674 service->status.dwCurrentState = SERVICE_STOPPED; 675 SetServiceStatus(service->status_handle, &service->status); 676 } 677 #endif 678 679 int main(int argc, char **argv) 680 { 681 const char *sopt = "hVvdm:p:l:f:b:s:t:"; 682 const char *method = NULL, *path = NULL; 683 const char *log_filepath = NULL; 684 const char *pid_filepath = QGA_PIDFILE_DEFAULT; 685 const char *state_dir = QGA_STATEDIR_DEFAULT; 686 #ifdef _WIN32 687 const char *service = NULL; 688 #endif 689 const struct option lopt[] = { 690 { "help", 0, NULL, 'h' }, 691 { "version", 0, NULL, 'V' }, 692 { "logfile", 1, NULL, 'l' }, 693 { "pidfile", 1, NULL, 'f' }, 694 { "verbose", 0, NULL, 'v' }, 695 { "method", 1, NULL, 'm' }, 696 { "path", 1, NULL, 'p' }, 697 { "daemonize", 0, NULL, 'd' }, 698 { "blacklist", 1, NULL, 'b' }, 699 #ifdef _WIN32 700 { "service", 1, NULL, 's' }, 701 #endif 702 { "statedir", 1, NULL, 't' }, 703 { NULL, 0, NULL, 0 } 704 }; 705 int opt_ind = 0, ch, daemonize = 0, i, j, len; 706 GLogLevelFlags log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL; 707 GList *blacklist = NULL; 708 GAState *s; 709 710 module_call_init(MODULE_INIT_QAPI); 711 712 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 713 switch (ch) { 714 case 'm': 715 method = optarg; 716 break; 717 case 'p': 718 path = optarg; 719 break; 720 case 'l': 721 log_filepath = optarg; 722 break; 723 case 'f': 724 pid_filepath = optarg; 725 break; 726 case 't': 727 state_dir = optarg; 728 break; 729 case 'v': 730 /* enable all log levels */ 731 log_level = G_LOG_LEVEL_MASK; 732 break; 733 case 'V': 734 printf("QEMU Guest Agent %s\n", QEMU_VERSION); 735 return 0; 736 case 'd': 737 daemonize = 1; 738 break; 739 case 'b': { 740 char **list_head, **list; 741 if (is_help_option(optarg)) { 742 list_head = list = qmp_get_command_list(); 743 while (*list != NULL) { 744 printf("%s\n", *list); 745 g_free(*list); 746 list++; 747 } 748 g_free(list_head); 749 return 0; 750 } 751 for (j = 0, i = 0, len = strlen(optarg); i < len; i++) { 752 if (optarg[i] == ',') { 753 optarg[i] = 0; 754 blacklist = g_list_append(blacklist, &optarg[j]); 755 j = i + 1; 756 } 757 } 758 if (j < i) { 759 blacklist = g_list_append(blacklist, &optarg[j]); 760 } 761 break; 762 } 763 #ifdef _WIN32 764 case 's': 765 service = optarg; 766 if (strcmp(service, "install") == 0) { 767 return ga_install_service(path, log_filepath); 768 } else if (strcmp(service, "uninstall") == 0) { 769 return ga_uninstall_service(); 770 } else { 771 printf("Unknown service command.\n"); 772 return EXIT_FAILURE; 773 } 774 break; 775 #endif 776 case 'h': 777 usage(argv[0]); 778 return 0; 779 case '?': 780 g_print("Unknown option, try '%s --help' for more information.\n", 781 argv[0]); 782 return EXIT_FAILURE; 783 } 784 } 785 786 s = g_malloc0(sizeof(GAState)); 787 s->log_level = log_level; 788 s->log_file = stderr; 789 g_log_set_default_handler(ga_log, s); 790 g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR); 791 ga_enable_logging(s); 792 s->state_filepath_isfrozen = g_strdup_printf("%s/qga.state.isfrozen", 793 state_dir); 794 s->frozen = false; 795 #ifndef _WIN32 796 /* check if a previous instance of qemu-ga exited with filesystems' state 797 * marked as frozen. this could be a stale value (a non-qemu-ga process 798 * or reboot may have since unfrozen them), but better to require an 799 * uneeded unfreeze than to risk hanging on start-up 800 */ 801 struct stat st; 802 if (stat(s->state_filepath_isfrozen, &st) == -1) { 803 /* it's okay if the file doesn't exist, but if we can't access for 804 * some other reason, such as permissions, there's a configuration 805 * that needs to be addressed. so just bail now before we get into 806 * more trouble later 807 */ 808 if (errno != ENOENT) { 809 g_critical("unable to access state file at path %s: %s", 810 s->state_filepath_isfrozen, strerror(errno)); 811 return EXIT_FAILURE; 812 } 813 } else { 814 g_warning("previous instance appears to have exited with frozen" 815 " filesystems. deferring logging/pidfile creation and" 816 " disabling non-fsfreeze-safe commands until" 817 " guest-fsfreeze-thaw is issued, or filesystems are" 818 " manually unfrozen and the file %s is removed", 819 s->state_filepath_isfrozen); 820 s->frozen = true; 821 } 822 #endif 823 824 if (ga_is_frozen(s)) { 825 if (daemonize) { 826 /* delay opening/locking of pidfile till filesystem are unfrozen */ 827 s->deferred_options.pid_filepath = pid_filepath; 828 become_daemon(NULL); 829 } 830 if (log_filepath) { 831 /* delay opening the log file till filesystems are unfrozen */ 832 s->deferred_options.log_filepath = log_filepath; 833 } 834 ga_disable_logging(s); 835 ga_disable_non_whitelisted(); 836 } else { 837 if (daemonize) { 838 become_daemon(pid_filepath); 839 } 840 if (log_filepath) { 841 FILE *log_file = fopen(log_filepath, "a"); 842 if (!log_file) { 843 g_critical("unable to open specified log file: %s", 844 strerror(errno)); 845 goto out_bad; 846 } 847 s->log_file = log_file; 848 } 849 } 850 851 if (blacklist) { 852 s->blacklist = blacklist; 853 do { 854 g_debug("disabling command: %s", (char *)blacklist->data); 855 qmp_disable_command(blacklist->data); 856 blacklist = g_list_next(blacklist); 857 } while (blacklist); 858 } 859 s->command_state = ga_command_state_new(); 860 ga_command_state_init(s, s->command_state); 861 ga_command_state_init_all(s->command_state); 862 json_message_parser_init(&s->parser, process_event); 863 ga_state = s; 864 #ifndef _WIN32 865 if (!register_signal_handlers()) { 866 g_critical("failed to register signal handlers"); 867 goto out_bad; 868 } 869 #endif 870 871 s->main_loop = g_main_loop_new(NULL, false); 872 if (!channel_init(ga_state, method, path)) { 873 g_critical("failed to initialize guest agent channel"); 874 goto out_bad; 875 } 876 #ifndef _WIN32 877 g_main_loop_run(ga_state->main_loop); 878 #else 879 if (daemonize) { 880 SERVICE_TABLE_ENTRY service_table[] = { 881 { (char *)QGA_SERVICE_NAME, service_main }, { NULL, NULL } }; 882 StartServiceCtrlDispatcher(service_table); 883 } else { 884 g_main_loop_run(ga_state->main_loop); 885 } 886 #endif 887 888 ga_command_state_cleanup_all(ga_state->command_state); 889 ga_channel_free(ga_state->channel); 890 891 if (daemonize) { 892 unlink(pid_filepath); 893 } 894 return 0; 895 896 out_bad: 897 if (daemonize) { 898 unlink(pid_filepath); 899 } 900 return EXIT_FAILURE; 901 } 902