1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qemu/cutils.h" 27 #include "monitor/monitor.h" 28 #include "sysemu/sysemu.h" 29 #include "qemu/config-file.h" 30 #include "qemu/error-report.h" 31 #include "qemu/qemu-print.h" 32 #include "chardev/char.h" 33 #include "qapi/error.h" 34 #include "qapi/qapi-commands-char.h" 35 #include "qapi/qmp/qerror.h" 36 #include "sysemu/replay.h" 37 #include "qemu/help_option.h" 38 #include "qemu/module.h" 39 #include "qemu/option.h" 40 #include "qemu/id.h" 41 42 #include "chardev/char-mux.h" 43 44 /***********************************************************/ 45 /* character device */ 46 47 static Object *get_chardevs_root(void) 48 { 49 return container_get(object_get_root(), "/chardevs"); 50 } 51 52 static void chr_be_event(Chardev *s, QEMUChrEvent event) 53 { 54 CharBackend *be = s->be; 55 56 if (!be || !be->chr_event) { 57 return; 58 } 59 60 be->chr_event(be->opaque, event); 61 } 62 63 void qemu_chr_be_event(Chardev *s, QEMUChrEvent event) 64 { 65 /* Keep track if the char device is open */ 66 switch (event) { 67 case CHR_EVENT_OPENED: 68 s->be_open = 1; 69 break; 70 case CHR_EVENT_CLOSED: 71 s->be_open = 0; 72 break; 73 case CHR_EVENT_BREAK: 74 case CHR_EVENT_MUX_IN: 75 case CHR_EVENT_MUX_OUT: 76 /* Ignore */ 77 break; 78 } 79 80 CHARDEV_GET_CLASS(s)->chr_be_event(s, event); 81 } 82 83 /* Not reporting errors from writing to logfile, as logs are 84 * defined to be "best effort" only */ 85 static void qemu_chr_write_log(Chardev *s, const uint8_t *buf, size_t len) 86 { 87 size_t done = 0; 88 ssize_t ret; 89 90 if (s->logfd < 0) { 91 return; 92 } 93 94 while (done < len) { 95 retry: 96 ret = write(s->logfd, buf + done, len - done); 97 if (ret == -1 && errno == EAGAIN) { 98 g_usleep(100); 99 goto retry; 100 } 101 102 if (ret <= 0) { 103 return; 104 } 105 done += ret; 106 } 107 } 108 109 static int qemu_chr_write_buffer(Chardev *s, 110 const uint8_t *buf, int len, 111 int *offset, bool write_all) 112 { 113 ChardevClass *cc = CHARDEV_GET_CLASS(s); 114 int res = 0; 115 *offset = 0; 116 117 qemu_mutex_lock(&s->chr_write_lock); 118 while (*offset < len) { 119 retry: 120 res = cc->chr_write(s, buf + *offset, len - *offset); 121 if (res < 0 && errno == EAGAIN && write_all) { 122 g_usleep(100); 123 goto retry; 124 } 125 126 if (res <= 0) { 127 break; 128 } 129 130 *offset += res; 131 if (!write_all) { 132 break; 133 } 134 } 135 if (*offset > 0) { 136 qemu_chr_write_log(s, buf, *offset); 137 } 138 qemu_mutex_unlock(&s->chr_write_lock); 139 140 return res; 141 } 142 143 int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool write_all) 144 { 145 int offset = 0; 146 int res; 147 148 if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) { 149 replay_char_write_event_load(&res, &offset); 150 assert(offset <= len); 151 qemu_chr_write_buffer(s, buf, offset, &offset, true); 152 return res; 153 } 154 155 res = qemu_chr_write_buffer(s, buf, len, &offset, write_all); 156 157 if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) { 158 replay_char_write_event_save(res, offset); 159 } 160 161 if (res < 0) { 162 return res; 163 } 164 return offset; 165 } 166 167 int qemu_chr_be_can_write(Chardev *s) 168 { 169 CharBackend *be = s->be; 170 171 if (!be || !be->chr_can_read) { 172 return 0; 173 } 174 175 return be->chr_can_read(be->opaque); 176 } 177 178 void qemu_chr_be_write_impl(Chardev *s, uint8_t *buf, int len) 179 { 180 CharBackend *be = s->be; 181 182 if (be && be->chr_read) { 183 be->chr_read(be->opaque, buf, len); 184 } 185 } 186 187 void qemu_chr_be_write(Chardev *s, uint8_t *buf, int len) 188 { 189 if (qemu_chr_replay(s)) { 190 if (replay_mode == REPLAY_MODE_PLAY) { 191 return; 192 } 193 replay_chr_be_write(s, buf, len); 194 } else { 195 qemu_chr_be_write_impl(s, buf, len); 196 } 197 } 198 199 void qemu_chr_be_update_read_handlers(Chardev *s, 200 GMainContext *context) 201 { 202 ChardevClass *cc = CHARDEV_GET_CLASS(s); 203 204 assert(qemu_chr_has_feature(s, QEMU_CHAR_FEATURE_GCONTEXT) 205 || !context); 206 s->gcontext = context; 207 if (cc->chr_update_read_handler) { 208 cc->chr_update_read_handler(s); 209 } 210 } 211 212 int qemu_chr_add_client(Chardev *s, int fd) 213 { 214 return CHARDEV_GET_CLASS(s)->chr_add_client ? 215 CHARDEV_GET_CLASS(s)->chr_add_client(s, fd) : -1; 216 } 217 218 static void qemu_char_open(Chardev *chr, ChardevBackend *backend, 219 bool *be_opened, Error **errp) 220 { 221 ChardevClass *cc = CHARDEV_GET_CLASS(chr); 222 /* Any ChardevCommon member would work */ 223 ChardevCommon *common = backend ? backend->u.null.data : NULL; 224 225 if (common && common->has_logfile) { 226 int flags = O_WRONLY | O_CREAT; 227 if (common->has_logappend && 228 common->logappend) { 229 flags |= O_APPEND; 230 } else { 231 flags |= O_TRUNC; 232 } 233 chr->logfd = qemu_open(common->logfile, flags, 0666); 234 if (chr->logfd < 0) { 235 error_setg_errno(errp, errno, 236 "Unable to open logfile %s", 237 common->logfile); 238 return; 239 } 240 } 241 242 if (cc->open) { 243 cc->open(chr, backend, be_opened, errp); 244 } 245 } 246 247 static void char_init(Object *obj) 248 { 249 Chardev *chr = CHARDEV(obj); 250 251 chr->logfd = -1; 252 qemu_mutex_init(&chr->chr_write_lock); 253 254 /* 255 * Assume if chr_update_read_handler is implemented it will 256 * take the updated gcontext into account. 257 */ 258 if (CHARDEV_GET_CLASS(chr)->chr_update_read_handler) { 259 qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT); 260 } 261 262 } 263 264 static int null_chr_write(Chardev *chr, const uint8_t *buf, int len) 265 { 266 return len; 267 } 268 269 static void char_class_init(ObjectClass *oc, void *data) 270 { 271 ChardevClass *cc = CHARDEV_CLASS(oc); 272 273 cc->chr_write = null_chr_write; 274 cc->chr_be_event = chr_be_event; 275 } 276 277 static void char_finalize(Object *obj) 278 { 279 Chardev *chr = CHARDEV(obj); 280 281 if (chr->be) { 282 chr->be->chr = NULL; 283 } 284 g_free(chr->filename); 285 g_free(chr->label); 286 if (chr->logfd != -1) { 287 close(chr->logfd); 288 } 289 qemu_mutex_destroy(&chr->chr_write_lock); 290 } 291 292 static const TypeInfo char_type_info = { 293 .name = TYPE_CHARDEV, 294 .parent = TYPE_OBJECT, 295 .instance_size = sizeof(Chardev), 296 .instance_init = char_init, 297 .instance_finalize = char_finalize, 298 .abstract = true, 299 .class_size = sizeof(ChardevClass), 300 .class_init = char_class_init, 301 }; 302 303 static int chardev_machine_done_notify_one(Object *child, void *opaque) 304 { 305 Chardev *chr = (Chardev *)child; 306 ChardevClass *class = CHARDEV_GET_CLASS(chr); 307 308 if (class->chr_machine_done) { 309 return class->chr_machine_done(chr); 310 } 311 312 return 0; 313 } 314 315 static void chardev_machine_done_hook(Notifier *notifier, void *unused) 316 { 317 int ret = object_child_foreach(get_chardevs_root(), 318 chardev_machine_done_notify_one, NULL); 319 320 if (ret) { 321 error_report("Failed to call chardev machine_done hooks"); 322 exit(1); 323 } 324 } 325 326 static Notifier chardev_machine_done_notify = { 327 .notify = chardev_machine_done_hook, 328 }; 329 330 static bool qemu_chr_is_busy(Chardev *s) 331 { 332 if (CHARDEV_IS_MUX(s)) { 333 MuxChardev *d = MUX_CHARDEV(s); 334 return d->mux_cnt >= 0; 335 } else { 336 return s->be != NULL; 337 } 338 } 339 340 int qemu_chr_wait_connected(Chardev *chr, Error **errp) 341 { 342 ChardevClass *cc = CHARDEV_GET_CLASS(chr); 343 344 if (cc->chr_wait_connected) { 345 return cc->chr_wait_connected(chr, errp); 346 } 347 348 return 0; 349 } 350 351 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename, 352 bool permit_mux_mon) 353 { 354 char host[65], port[33], width[8], height[8]; 355 int pos; 356 const char *p; 357 QemuOpts *opts; 358 Error *local_err = NULL; 359 360 opts = qemu_opts_create(qemu_find_opts("chardev"), label, 1, &local_err); 361 if (local_err) { 362 error_report_err(local_err); 363 return NULL; 364 } 365 366 if (strstart(filename, "mon:", &p)) { 367 if (!permit_mux_mon) { 368 error_report("mon: isn't supported in this context"); 369 return NULL; 370 } 371 filename = p; 372 qemu_opt_set(opts, "mux", "on", &error_abort); 373 if (strcmp(filename, "stdio") == 0) { 374 /* Monitor is muxed to stdio: do not exit on Ctrl+C by default 375 * but pass it to the guest. Handle this only for compat syntax, 376 * for -chardev syntax we have special option for this. 377 * This is what -nographic did, redirecting+muxing serial+monitor 378 * to stdio causing Ctrl+C to be passed to guest. */ 379 qemu_opt_set(opts, "signal", "off", &error_abort); 380 } 381 } 382 383 if (strcmp(filename, "null") == 0 || 384 strcmp(filename, "pty") == 0 || 385 strcmp(filename, "msmouse") == 0 || 386 strcmp(filename, "wctablet") == 0 || 387 strcmp(filename, "braille") == 0 || 388 strcmp(filename, "testdev") == 0 || 389 strcmp(filename, "stdio") == 0) { 390 qemu_opt_set(opts, "backend", filename, &error_abort); 391 return opts; 392 } 393 if (strstart(filename, "vc", &p)) { 394 qemu_opt_set(opts, "backend", "vc", &error_abort); 395 if (*p == ':') { 396 if (sscanf(p+1, "%7[0-9]x%7[0-9]", width, height) == 2) { 397 /* pixels */ 398 qemu_opt_set(opts, "width", width, &error_abort); 399 qemu_opt_set(opts, "height", height, &error_abort); 400 } else if (sscanf(p+1, "%7[0-9]Cx%7[0-9]C", width, height) == 2) { 401 /* chars */ 402 qemu_opt_set(opts, "cols", width, &error_abort); 403 qemu_opt_set(opts, "rows", height, &error_abort); 404 } else { 405 goto fail; 406 } 407 } 408 return opts; 409 } 410 if (strcmp(filename, "con:") == 0) { 411 qemu_opt_set(opts, "backend", "console", &error_abort); 412 return opts; 413 } 414 if (strstart(filename, "COM", NULL)) { 415 qemu_opt_set(opts, "backend", "serial", &error_abort); 416 qemu_opt_set(opts, "path", filename, &error_abort); 417 return opts; 418 } 419 if (strstart(filename, "file:", &p)) { 420 qemu_opt_set(opts, "backend", "file", &error_abort); 421 qemu_opt_set(opts, "path", p, &error_abort); 422 return opts; 423 } 424 if (strstart(filename, "pipe:", &p)) { 425 qemu_opt_set(opts, "backend", "pipe", &error_abort); 426 qemu_opt_set(opts, "path", p, &error_abort); 427 return opts; 428 } 429 if (strstart(filename, "tcp:", &p) || 430 strstart(filename, "telnet:", &p) || 431 strstart(filename, "tn3270:", &p) || 432 strstart(filename, "websocket:", &p)) { 433 if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) { 434 host[0] = 0; 435 if (sscanf(p, ":%32[^,]%n", port, &pos) < 1) 436 goto fail; 437 } 438 qemu_opt_set(opts, "backend", "socket", &error_abort); 439 qemu_opt_set(opts, "host", host, &error_abort); 440 qemu_opt_set(opts, "port", port, &error_abort); 441 if (p[pos] == ',') { 442 qemu_opts_do_parse(opts, p+pos+1, NULL, &local_err); 443 if (local_err) { 444 error_report_err(local_err); 445 goto fail; 446 } 447 } 448 if (strstart(filename, "telnet:", &p)) { 449 qemu_opt_set(opts, "telnet", "on", &error_abort); 450 } else if (strstart(filename, "tn3270:", &p)) { 451 qemu_opt_set(opts, "tn3270", "on", &error_abort); 452 } else if (strstart(filename, "websocket:", &p)) { 453 qemu_opt_set(opts, "websocket", "on", &error_abort); 454 } 455 return opts; 456 } 457 if (strstart(filename, "udp:", &p)) { 458 qemu_opt_set(opts, "backend", "udp", &error_abort); 459 if (sscanf(p, "%64[^:]:%32[^@,]%n", host, port, &pos) < 2) { 460 host[0] = 0; 461 if (sscanf(p, ":%32[^@,]%n", port, &pos) < 1) { 462 goto fail; 463 } 464 } 465 qemu_opt_set(opts, "host", host, &error_abort); 466 qemu_opt_set(opts, "port", port, &error_abort); 467 if (p[pos] == '@') { 468 p += pos + 1; 469 if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) { 470 host[0] = 0; 471 if (sscanf(p, ":%32[^,]%n", port, &pos) < 1) { 472 goto fail; 473 } 474 } 475 qemu_opt_set(opts, "localaddr", host, &error_abort); 476 qemu_opt_set(opts, "localport", port, &error_abort); 477 } 478 return opts; 479 } 480 if (strstart(filename, "unix:", &p)) { 481 qemu_opt_set(opts, "backend", "socket", &error_abort); 482 qemu_opts_do_parse(opts, p, "path", &local_err); 483 if (local_err) { 484 error_report_err(local_err); 485 goto fail; 486 } 487 return opts; 488 } 489 if (strstart(filename, "/dev/parport", NULL) || 490 strstart(filename, "/dev/ppi", NULL)) { 491 qemu_opt_set(opts, "backend", "parallel", &error_abort); 492 qemu_opt_set(opts, "path", filename, &error_abort); 493 return opts; 494 } 495 if (strstart(filename, "/dev/", NULL)) { 496 qemu_opt_set(opts, "backend", "serial", &error_abort); 497 qemu_opt_set(opts, "path", filename, &error_abort); 498 return opts; 499 } 500 501 error_report("'%s' is not a valid char driver", filename); 502 503 fail: 504 qemu_opts_del(opts); 505 return NULL; 506 } 507 508 void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend) 509 { 510 const char *logfile = qemu_opt_get(opts, "logfile"); 511 512 backend->has_logfile = logfile != NULL; 513 backend->logfile = g_strdup(logfile); 514 515 backend->has_logappend = true; 516 backend->logappend = qemu_opt_get_bool(opts, "logappend", false); 517 } 518 519 static const ChardevClass *char_get_class(const char *driver, Error **errp) 520 { 521 ObjectClass *oc; 522 const ChardevClass *cc; 523 char *typename = g_strdup_printf("chardev-%s", driver); 524 525 oc = object_class_by_name(typename); 526 g_free(typename); 527 528 if (!object_class_dynamic_cast(oc, TYPE_CHARDEV)) { 529 error_setg(errp, "'%s' is not a valid char driver name", driver); 530 return NULL; 531 } 532 533 if (object_class_is_abstract(oc)) { 534 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver", 535 "abstract device type"); 536 return NULL; 537 } 538 539 cc = CHARDEV_CLASS(oc); 540 if (cc->internal) { 541 error_setg(errp, "'%s' is not a valid char driver name", driver); 542 return NULL; 543 } 544 545 return cc; 546 } 547 548 static const struct ChardevAlias { 549 const char *typename; 550 const char *alias; 551 } chardev_alias_table[] = { 552 #ifdef HAVE_CHARDEV_PARPORT 553 { "parallel", "parport" }, 554 #endif 555 #ifdef HAVE_CHARDEV_SERIAL 556 { "serial", "tty" }, 557 #endif 558 }; 559 560 typedef struct ChadevClassFE { 561 void (*fn)(const char *name, void *opaque); 562 void *opaque; 563 } ChadevClassFE; 564 565 static void 566 chardev_class_foreach(ObjectClass *klass, void *opaque) 567 { 568 ChadevClassFE *fe = opaque; 569 570 assert(g_str_has_prefix(object_class_get_name(klass), "chardev-")); 571 if (CHARDEV_CLASS(klass)->internal) { 572 return; 573 } 574 575 fe->fn(object_class_get_name(klass) + 8, fe->opaque); 576 } 577 578 static void 579 chardev_name_foreach(void (*fn)(const char *name, void *opaque), void *opaque) 580 { 581 ChadevClassFE fe = { .fn = fn, .opaque = opaque }; 582 int i; 583 584 object_class_foreach(chardev_class_foreach, TYPE_CHARDEV, false, &fe); 585 586 for (i = 0; i < (int)ARRAY_SIZE(chardev_alias_table); i++) { 587 fn(chardev_alias_table[i].alias, opaque); 588 } 589 } 590 591 static void 592 help_string_append(const char *name, void *opaque) 593 { 594 GString *str = opaque; 595 596 g_string_append_printf(str, "\n %s", name); 597 } 598 599 static const char *chardev_alias_translate(const char *name) 600 { 601 int i; 602 for (i = 0; i < (int)ARRAY_SIZE(chardev_alias_table); i++) { 603 if (g_strcmp0(chardev_alias_table[i].alias, name) == 0) { 604 return chardev_alias_table[i].typename; 605 } 606 } 607 return name; 608 } 609 610 ChardevBackend *qemu_chr_parse_opts(QemuOpts *opts, Error **errp) 611 { 612 Error *local_err = NULL; 613 const ChardevClass *cc; 614 ChardevBackend *backend = NULL; 615 const char *name = chardev_alias_translate(qemu_opt_get(opts, "backend")); 616 617 if (name == NULL) { 618 error_setg(errp, "chardev: \"%s\" missing backend", 619 qemu_opts_id(opts)); 620 return NULL; 621 } 622 623 cc = char_get_class(name, errp); 624 if (cc == NULL) { 625 return NULL; 626 } 627 628 backend = g_new0(ChardevBackend, 1); 629 backend->type = CHARDEV_BACKEND_KIND_NULL; 630 631 if (cc->parse) { 632 cc->parse(opts, backend, &local_err); 633 if (local_err) { 634 error_propagate(errp, local_err); 635 qapi_free_ChardevBackend(backend); 636 return NULL; 637 } 638 } else { 639 ChardevCommon *ccom = g_new0(ChardevCommon, 1); 640 qemu_chr_parse_common(opts, ccom); 641 backend->u.null.data = ccom; /* Any ChardevCommon member would work */ 642 } 643 644 return backend; 645 } 646 647 Chardev *qemu_chr_new_from_opts(QemuOpts *opts, GMainContext *context, 648 Error **errp) 649 { 650 const ChardevClass *cc; 651 Chardev *chr = NULL; 652 ChardevBackend *backend = NULL; 653 const char *name = chardev_alias_translate(qemu_opt_get(opts, "backend")); 654 const char *id = qemu_opts_id(opts); 655 char *bid = NULL; 656 657 if (name && is_help_option(name)) { 658 GString *str = g_string_new(""); 659 660 chardev_name_foreach(help_string_append, str); 661 662 qemu_printf("Available chardev backend types: %s\n", str->str); 663 g_string_free(str, true); 664 return NULL; 665 } 666 667 if (id == NULL) { 668 error_setg(errp, "chardev: no id specified"); 669 return NULL; 670 } 671 672 backend = qemu_chr_parse_opts(opts, errp); 673 if (backend == NULL) { 674 return NULL; 675 } 676 677 cc = char_get_class(name, errp); 678 if (cc == NULL) { 679 goto out; 680 } 681 682 if (qemu_opt_get_bool(opts, "mux", 0)) { 683 bid = g_strdup_printf("%s-base", id); 684 } 685 686 chr = qemu_chardev_new(bid ? bid : id, 687 object_class_get_name(OBJECT_CLASS(cc)), 688 backend, context, errp); 689 690 if (chr == NULL) { 691 goto out; 692 } 693 694 if (bid) { 695 Chardev *mux; 696 qapi_free_ChardevBackend(backend); 697 backend = g_new0(ChardevBackend, 1); 698 backend->type = CHARDEV_BACKEND_KIND_MUX; 699 backend->u.mux.data = g_new0(ChardevMux, 1); 700 backend->u.mux.data->chardev = g_strdup(bid); 701 mux = qemu_chardev_new(id, TYPE_CHARDEV_MUX, backend, context, errp); 702 if (mux == NULL) { 703 object_unparent(OBJECT(chr)); 704 chr = NULL; 705 goto out; 706 } 707 chr = mux; 708 } 709 710 out: 711 qapi_free_ChardevBackend(backend); 712 g_free(bid); 713 return chr; 714 } 715 716 Chardev *qemu_chr_new_noreplay(const char *label, const char *filename, 717 bool permit_mux_mon, GMainContext *context) 718 { 719 const char *p; 720 Chardev *chr; 721 QemuOpts *opts; 722 Error *err = NULL; 723 724 if (strstart(filename, "chardev:", &p)) { 725 return qemu_chr_find(p); 726 } 727 728 opts = qemu_chr_parse_compat(label, filename, permit_mux_mon); 729 if (!opts) 730 return NULL; 731 732 chr = qemu_chr_new_from_opts(opts, context, &err); 733 if (!chr) { 734 error_report_err(err); 735 goto out; 736 } 737 738 if (qemu_opt_get_bool(opts, "mux", 0)) { 739 assert(permit_mux_mon); 740 monitor_init_hmp(chr, true, &err); 741 if (err) { 742 error_report_err(err); 743 object_unparent(OBJECT(chr)); 744 chr = NULL; 745 goto out; 746 } 747 } 748 749 out: 750 qemu_opts_del(opts); 751 return chr; 752 } 753 754 static Chardev *qemu_chr_new_permit_mux_mon(const char *label, 755 const char *filename, 756 bool permit_mux_mon, 757 GMainContext *context) 758 { 759 Chardev *chr; 760 chr = qemu_chr_new_noreplay(label, filename, permit_mux_mon, context); 761 if (chr) { 762 if (replay_mode != REPLAY_MODE_NONE) { 763 qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_REPLAY); 764 } 765 if (qemu_chr_replay(chr) && CHARDEV_GET_CLASS(chr)->chr_ioctl) { 766 error_report("Replay: ioctl is not supported " 767 "for serial devices yet"); 768 } 769 replay_register_char_driver(chr); 770 } 771 return chr; 772 } 773 774 Chardev *qemu_chr_new(const char *label, const char *filename, 775 GMainContext *context) 776 { 777 return qemu_chr_new_permit_mux_mon(label, filename, false, context); 778 } 779 780 Chardev *qemu_chr_new_mux_mon(const char *label, const char *filename, 781 GMainContext *context) 782 { 783 return qemu_chr_new_permit_mux_mon(label, filename, true, context); 784 } 785 786 static int qmp_query_chardev_foreach(Object *obj, void *data) 787 { 788 Chardev *chr = CHARDEV(obj); 789 ChardevInfoList **list = data; 790 ChardevInfoList *info = g_malloc0(sizeof(*info)); 791 792 info->value = g_malloc0(sizeof(*info->value)); 793 info->value->label = g_strdup(chr->label); 794 info->value->filename = g_strdup(chr->filename); 795 info->value->frontend_open = chr->be && chr->be->fe_open; 796 797 info->next = *list; 798 *list = info; 799 800 return 0; 801 } 802 803 ChardevInfoList *qmp_query_chardev(Error **errp) 804 { 805 ChardevInfoList *chr_list = NULL; 806 807 object_child_foreach(get_chardevs_root(), 808 qmp_query_chardev_foreach, &chr_list); 809 810 return chr_list; 811 } 812 813 static void 814 qmp_prepend_backend(const char *name, void *opaque) 815 { 816 ChardevBackendInfoList **list = opaque; 817 ChardevBackendInfoList *info = g_malloc0(sizeof(*info)); 818 819 info->value = g_malloc0(sizeof(*info->value)); 820 info->value->name = g_strdup(name); 821 info->next = *list; 822 *list = info; 823 } 824 825 ChardevBackendInfoList *qmp_query_chardev_backends(Error **errp) 826 { 827 ChardevBackendInfoList *backend_list = NULL; 828 829 chardev_name_foreach(qmp_prepend_backend, &backend_list); 830 831 return backend_list; 832 } 833 834 Chardev *qemu_chr_find(const char *name) 835 { 836 Object *obj = object_resolve_path_component(get_chardevs_root(), name); 837 838 return obj ? CHARDEV(obj) : NULL; 839 } 840 841 QemuOptsList qemu_chardev_opts = { 842 .name = "chardev", 843 .implied_opt_name = "backend", 844 .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head), 845 .desc = { 846 { 847 .name = "backend", 848 .type = QEMU_OPT_STRING, 849 },{ 850 .name = "path", 851 .type = QEMU_OPT_STRING, 852 },{ 853 .name = "host", 854 .type = QEMU_OPT_STRING, 855 },{ 856 .name = "port", 857 .type = QEMU_OPT_STRING, 858 },{ 859 .name = "fd", 860 .type = QEMU_OPT_STRING, 861 },{ 862 .name = "localaddr", 863 .type = QEMU_OPT_STRING, 864 },{ 865 .name = "localport", 866 .type = QEMU_OPT_STRING, 867 },{ 868 .name = "to", 869 .type = QEMU_OPT_NUMBER, 870 },{ 871 .name = "ipv4", 872 .type = QEMU_OPT_BOOL, 873 },{ 874 .name = "ipv6", 875 .type = QEMU_OPT_BOOL, 876 },{ 877 .name = "wait", 878 .type = QEMU_OPT_BOOL, 879 },{ 880 .name = "server", 881 .type = QEMU_OPT_BOOL, 882 },{ 883 .name = "delay", 884 .type = QEMU_OPT_BOOL, 885 },{ 886 .name = "reconnect", 887 .type = QEMU_OPT_NUMBER, 888 },{ 889 .name = "telnet", 890 .type = QEMU_OPT_BOOL, 891 },{ 892 .name = "tn3270", 893 .type = QEMU_OPT_BOOL, 894 },{ 895 .name = "tls-creds", 896 .type = QEMU_OPT_STRING, 897 },{ 898 .name = "tls-authz", 899 .type = QEMU_OPT_STRING, 900 },{ 901 .name = "websocket", 902 .type = QEMU_OPT_BOOL, 903 },{ 904 .name = "width", 905 .type = QEMU_OPT_NUMBER, 906 },{ 907 .name = "height", 908 .type = QEMU_OPT_NUMBER, 909 },{ 910 .name = "cols", 911 .type = QEMU_OPT_NUMBER, 912 },{ 913 .name = "rows", 914 .type = QEMU_OPT_NUMBER, 915 },{ 916 .name = "mux", 917 .type = QEMU_OPT_BOOL, 918 },{ 919 .name = "signal", 920 .type = QEMU_OPT_BOOL, 921 },{ 922 .name = "name", 923 .type = QEMU_OPT_STRING, 924 },{ 925 .name = "debug", 926 .type = QEMU_OPT_NUMBER, 927 },{ 928 .name = "size", 929 .type = QEMU_OPT_SIZE, 930 },{ 931 .name = "chardev", 932 .type = QEMU_OPT_STRING, 933 },{ 934 .name = "append", 935 .type = QEMU_OPT_BOOL, 936 },{ 937 .name = "logfile", 938 .type = QEMU_OPT_STRING, 939 },{ 940 .name = "logappend", 941 .type = QEMU_OPT_BOOL, 942 }, 943 { /* end of list */ } 944 }, 945 }; 946 947 bool qemu_chr_has_feature(Chardev *chr, 948 ChardevFeature feature) 949 { 950 return test_bit(feature, chr->features); 951 } 952 953 void qemu_chr_set_feature(Chardev *chr, 954 ChardevFeature feature) 955 { 956 return set_bit(feature, chr->features); 957 } 958 959 static Chardev *chardev_new(const char *id, const char *typename, 960 ChardevBackend *backend, 961 GMainContext *gcontext, 962 Error **errp) 963 { 964 Object *obj; 965 Chardev *chr = NULL; 966 Error *local_err = NULL; 967 bool be_opened = true; 968 969 assert(g_str_has_prefix(typename, "chardev-")); 970 971 obj = object_new(typename); 972 chr = CHARDEV(obj); 973 chr->label = g_strdup(id); 974 chr->gcontext = gcontext; 975 976 qemu_char_open(chr, backend, &be_opened, &local_err); 977 if (local_err) { 978 goto end; 979 } 980 981 if (!chr->filename) { 982 chr->filename = g_strdup(typename + 8); 983 } 984 if (be_opened) { 985 qemu_chr_be_event(chr, CHR_EVENT_OPENED); 986 } 987 988 if (id) { 989 object_property_add_child(get_chardevs_root(), id, obj, &local_err); 990 if (local_err) { 991 goto end; 992 } 993 object_unref(obj); 994 } 995 996 end: 997 if (local_err) { 998 error_propagate(errp, local_err); 999 object_unref(obj); 1000 return NULL; 1001 } 1002 1003 return chr; 1004 } 1005 1006 Chardev *qemu_chardev_new(const char *id, const char *typename, 1007 ChardevBackend *backend, 1008 GMainContext *gcontext, 1009 Error **errp) 1010 { 1011 g_autofree char *genid = NULL; 1012 1013 if (!id) { 1014 genid = id_generate(ID_CHR); 1015 id = genid; 1016 } 1017 1018 return chardev_new(id, typename, backend, gcontext, errp); 1019 } 1020 1021 ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend, 1022 Error **errp) 1023 { 1024 const ChardevClass *cc; 1025 ChardevReturn *ret; 1026 Chardev *chr; 1027 1028 cc = char_get_class(ChardevBackendKind_str(backend->type), errp); 1029 if (!cc) { 1030 return NULL; 1031 } 1032 1033 chr = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc)), 1034 backend, NULL, errp); 1035 if (!chr) { 1036 return NULL; 1037 } 1038 1039 ret = g_new0(ChardevReturn, 1); 1040 if (CHARDEV_IS_PTY(chr)) { 1041 ret->pty = g_strdup(chr->filename + 4); 1042 ret->has_pty = true; 1043 } 1044 1045 return ret; 1046 } 1047 1048 ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, 1049 Error **errp) 1050 { 1051 CharBackend *be; 1052 const ChardevClass *cc; 1053 Chardev *chr, *chr_new; 1054 bool closed_sent = false; 1055 ChardevReturn *ret; 1056 1057 chr = qemu_chr_find(id); 1058 if (!chr) { 1059 error_setg(errp, "Chardev '%s' does not exist", id); 1060 return NULL; 1061 } 1062 1063 if (CHARDEV_IS_MUX(chr)) { 1064 error_setg(errp, "Mux device hotswap not supported yet"); 1065 return NULL; 1066 } 1067 1068 if (qemu_chr_replay(chr)) { 1069 error_setg(errp, 1070 "Chardev '%s' cannot be changed in record/replay mode", id); 1071 return NULL; 1072 } 1073 1074 be = chr->be; 1075 if (!be) { 1076 /* easy case */ 1077 object_unparent(OBJECT(chr)); 1078 return qmp_chardev_add(id, backend, errp); 1079 } 1080 1081 if (!be->chr_be_change) { 1082 error_setg(errp, "Chardev user does not support chardev hotswap"); 1083 return NULL; 1084 } 1085 1086 cc = char_get_class(ChardevBackendKind_str(backend->type), errp); 1087 if (!cc) { 1088 return NULL; 1089 } 1090 1091 chr_new = chardev_new(NULL, object_class_get_name(OBJECT_CLASS(cc)), 1092 backend, chr->gcontext, errp); 1093 if (!chr_new) { 1094 return NULL; 1095 } 1096 chr_new->label = g_strdup(id); 1097 1098 if (chr->be_open && !chr_new->be_open) { 1099 qemu_chr_be_event(chr, CHR_EVENT_CLOSED); 1100 closed_sent = true; 1101 } 1102 1103 chr->be = NULL; 1104 qemu_chr_fe_init(be, chr_new, &error_abort); 1105 1106 if (be->chr_be_change(be->opaque) < 0) { 1107 error_setg(errp, "Chardev '%s' change failed", chr_new->label); 1108 chr_new->be = NULL; 1109 qemu_chr_fe_init(be, chr, &error_abort); 1110 if (closed_sent) { 1111 qemu_chr_be_event(chr, CHR_EVENT_OPENED); 1112 } 1113 object_unref(OBJECT(chr_new)); 1114 return NULL; 1115 } 1116 1117 object_unparent(OBJECT(chr)); 1118 object_property_add_child(get_chardevs_root(), chr_new->label, 1119 OBJECT(chr_new), &error_abort); 1120 object_unref(OBJECT(chr_new)); 1121 1122 ret = g_new0(ChardevReturn, 1); 1123 if (CHARDEV_IS_PTY(chr_new)) { 1124 ret->pty = g_strdup(chr_new->filename + 4); 1125 ret->has_pty = true; 1126 } 1127 1128 return ret; 1129 } 1130 1131 void qmp_chardev_remove(const char *id, Error **errp) 1132 { 1133 Chardev *chr; 1134 1135 chr = qemu_chr_find(id); 1136 if (chr == NULL) { 1137 error_setg(errp, "Chardev '%s' not found", id); 1138 return; 1139 } 1140 if (qemu_chr_is_busy(chr)) { 1141 error_setg(errp, "Chardev '%s' is busy", id); 1142 return; 1143 } 1144 if (qemu_chr_replay(chr)) { 1145 error_setg(errp, 1146 "Chardev '%s' cannot be unplugged in record/replay mode", id); 1147 return; 1148 } 1149 object_unparent(OBJECT(chr)); 1150 } 1151 1152 void qmp_chardev_send_break(const char *id, Error **errp) 1153 { 1154 Chardev *chr; 1155 1156 chr = qemu_chr_find(id); 1157 if (chr == NULL) { 1158 error_setg(errp, "Chardev '%s' not found", id); 1159 return; 1160 } 1161 qemu_chr_be_event(chr, CHR_EVENT_BREAK); 1162 } 1163 1164 /* 1165 * Add a timeout callback for the chardev (in milliseconds), return 1166 * the GSource object created. Please use this to add timeout hook for 1167 * chardev instead of g_timeout_add() and g_timeout_add_seconds(), to 1168 * make sure the gcontext that the task bound to is correct. 1169 */ 1170 GSource *qemu_chr_timeout_add_ms(Chardev *chr, guint ms, 1171 GSourceFunc func, void *private) 1172 { 1173 GSource *source = g_timeout_source_new(ms); 1174 1175 assert(func); 1176 g_source_set_callback(source, func, private, NULL); 1177 g_source_attach(source, chr->gcontext); 1178 1179 return source; 1180 } 1181 1182 void qemu_chr_cleanup(void) 1183 { 1184 object_unparent(get_chardevs_root()); 1185 } 1186 1187 static void register_types(void) 1188 { 1189 type_register_static(&char_type_info); 1190 1191 /* this must be done after machine init, since we register FEs with muxes 1192 * as part of realize functions like serial_isa_realizefn when -nographic 1193 * is specified 1194 */ 1195 qemu_add_machine_init_done_notifier(&chardev_machine_done_notify); 1196 } 1197 1198 type_init(register_types); 1199