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 #include "qemu/coroutine.h" 42 43 #include "chardev-internal.h" 44 45 /***********************************************************/ 46 /* character device */ 47 48 Object *get_chardevs_root(void) 49 { 50 return container_get(object_get_root(), "/chardevs"); 51 } 52 53 static void chr_be_event(Chardev *s, QEMUChrEvent event) 54 { 55 CharBackend *be = s->be; 56 57 if (!be || !be->chr_event) { 58 return; 59 } 60 61 be->chr_event(be->opaque, event); 62 } 63 64 void qemu_chr_be_event(Chardev *s, QEMUChrEvent event) 65 { 66 /* Keep track if the char device is open */ 67 switch (event) { 68 case CHR_EVENT_OPENED: 69 s->be_open = 1; 70 break; 71 case CHR_EVENT_CLOSED: 72 s->be_open = 0; 73 break; 74 case CHR_EVENT_BREAK: 75 case CHR_EVENT_MUX_IN: 76 case CHR_EVENT_MUX_OUT: 77 /* Ignore */ 78 break; 79 } 80 81 CHARDEV_GET_CLASS(s)->chr_be_event(s, event); 82 } 83 84 /* Not reporting errors from writing to logfile, as logs are 85 * defined to be "best effort" only */ 86 static void qemu_chr_write_log(Chardev *s, const uint8_t *buf, size_t len) 87 { 88 size_t done = 0; 89 ssize_t ret; 90 91 if (s->logfd < 0) { 92 return; 93 } 94 95 while (done < len) { 96 retry: 97 ret = write(s->logfd, buf + done, len - done); 98 if (ret == -1 && errno == EAGAIN) { 99 g_usleep(100); 100 goto retry; 101 } 102 103 if (ret <= 0) { 104 return; 105 } 106 done += ret; 107 } 108 } 109 110 static int qemu_chr_write_buffer(Chardev *s, 111 const uint8_t *buf, int len, 112 int *offset, bool write_all) 113 { 114 ChardevClass *cc = CHARDEV_GET_CLASS(s); 115 int res = 0; 116 *offset = 0; 117 118 qemu_mutex_lock(&s->chr_write_lock); 119 while (*offset < len) { 120 retry: 121 res = cc->chr_write(s, buf + *offset, len - *offset); 122 if (res < 0 && errno == EAGAIN && write_all) { 123 if (qemu_in_coroutine()) { 124 qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 100000); 125 } else { 126 g_usleep(100); 127 } 128 goto retry; 129 } 130 131 if (res <= 0) { 132 break; 133 } 134 135 *offset += res; 136 if (!write_all) { 137 break; 138 } 139 } 140 if (*offset > 0) { 141 /* 142 * If some data was written by backend, we should 143 * only log what was actually written. This method 144 * may be invoked again to write the remaining 145 * method, thus we'll log the remainder at that time. 146 */ 147 qemu_chr_write_log(s, buf, *offset); 148 } else if (res < 0) { 149 /* 150 * If a fatal error was reported by the backend, 151 * assume this method won't be invoked again with 152 * this buffer, so log it all right away. 153 */ 154 qemu_chr_write_log(s, buf, len); 155 } 156 qemu_mutex_unlock(&s->chr_write_lock); 157 158 return res; 159 } 160 161 int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool write_all) 162 { 163 int offset = 0; 164 int res; 165 166 if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) { 167 replay_char_write_event_load(&res, &offset); 168 assert(offset <= len); 169 qemu_chr_write_buffer(s, buf, offset, &offset, true); 170 return res; 171 } 172 173 res = qemu_chr_write_buffer(s, buf, len, &offset, write_all); 174 175 if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) { 176 replay_char_write_event_save(res, offset); 177 } 178 179 if (res < 0) { 180 return res; 181 } 182 return offset; 183 } 184 185 int qemu_chr_be_can_write(Chardev *s) 186 { 187 CharBackend *be = s->be; 188 189 if (!be || !be->chr_can_read) { 190 return 0; 191 } 192 193 return be->chr_can_read(be->opaque); 194 } 195 196 void qemu_chr_be_write_impl(Chardev *s, uint8_t *buf, int len) 197 { 198 CharBackend *be = s->be; 199 200 if (be && be->chr_read) { 201 be->chr_read(be->opaque, buf, len); 202 } 203 } 204 205 void qemu_chr_be_write(Chardev *s, uint8_t *buf, int len) 206 { 207 if (qemu_chr_replay(s)) { 208 if (replay_mode == REPLAY_MODE_PLAY) { 209 return; 210 } 211 replay_chr_be_write(s, buf, len); 212 } else { 213 qemu_chr_be_write_impl(s, buf, len); 214 } 215 } 216 217 void qemu_chr_be_update_read_handlers(Chardev *s, 218 GMainContext *context) 219 { 220 ChardevClass *cc = CHARDEV_GET_CLASS(s); 221 222 assert(qemu_chr_has_feature(s, QEMU_CHAR_FEATURE_GCONTEXT) 223 || !context); 224 s->gcontext = context; 225 if (cc->chr_update_read_handler) { 226 cc->chr_update_read_handler(s); 227 } 228 } 229 230 int qemu_chr_add_client(Chardev *s, int fd) 231 { 232 return CHARDEV_GET_CLASS(s)->chr_add_client ? 233 CHARDEV_GET_CLASS(s)->chr_add_client(s, fd) : -1; 234 } 235 236 static void qemu_char_open(Chardev *chr, ChardevBackend *backend, 237 bool *be_opened, Error **errp) 238 { 239 ChardevClass *cc = CHARDEV_GET_CLASS(chr); 240 /* Any ChardevCommon member would work */ 241 ChardevCommon *common = backend ? backend->u.null.data : NULL; 242 243 if (common && common->has_logfile) { 244 int flags = O_WRONLY | O_CREAT; 245 if (common->has_logappend && 246 common->logappend) { 247 flags |= O_APPEND; 248 } else { 249 flags |= O_TRUNC; 250 } 251 chr->logfd = qemu_open_old(common->logfile, flags, 0666); 252 if (chr->logfd < 0) { 253 error_setg_errno(errp, errno, 254 "Unable to open logfile %s", 255 common->logfile); 256 return; 257 } 258 } 259 260 if (cc->open) { 261 cc->open(chr, backend, be_opened, errp); 262 } 263 } 264 265 static void char_init(Object *obj) 266 { 267 Chardev *chr = CHARDEV(obj); 268 269 chr->logfd = -1; 270 qemu_mutex_init(&chr->chr_write_lock); 271 272 /* 273 * Assume if chr_update_read_handler is implemented it will 274 * take the updated gcontext into account. 275 */ 276 if (CHARDEV_GET_CLASS(chr)->chr_update_read_handler) { 277 qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT); 278 } 279 280 } 281 282 static int null_chr_write(Chardev *chr, const uint8_t *buf, int len) 283 { 284 return len; 285 } 286 287 static void char_class_init(ObjectClass *oc, void *data) 288 { 289 ChardevClass *cc = CHARDEV_CLASS(oc); 290 291 cc->chr_write = null_chr_write; 292 cc->chr_be_event = chr_be_event; 293 } 294 295 static void char_finalize(Object *obj) 296 { 297 Chardev *chr = CHARDEV(obj); 298 299 if (chr->be) { 300 chr->be->chr = NULL; 301 } 302 g_free(chr->filename); 303 g_free(chr->label); 304 if (chr->logfd != -1) { 305 close(chr->logfd); 306 } 307 qemu_mutex_destroy(&chr->chr_write_lock); 308 } 309 310 static const TypeInfo char_type_info = { 311 .name = TYPE_CHARDEV, 312 .parent = TYPE_OBJECT, 313 .instance_size = sizeof(Chardev), 314 .instance_init = char_init, 315 .instance_finalize = char_finalize, 316 .abstract = true, 317 .class_size = sizeof(ChardevClass), 318 .class_init = char_class_init, 319 }; 320 321 static bool qemu_chr_is_busy(Chardev *s) 322 { 323 if (CHARDEV_IS_MUX(s)) { 324 MuxChardev *d = MUX_CHARDEV(s); 325 return d->mux_cnt >= 0; 326 } else { 327 return s->be != NULL; 328 } 329 } 330 331 int qemu_chr_wait_connected(Chardev *chr, Error **errp) 332 { 333 ChardevClass *cc = CHARDEV_GET_CLASS(chr); 334 335 if (cc->chr_wait_connected) { 336 return cc->chr_wait_connected(chr, errp); 337 } 338 339 return 0; 340 } 341 342 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename, 343 bool permit_mux_mon) 344 { 345 char host[65], port[33], width[8], height[8]; 346 int pos; 347 const char *p; 348 QemuOpts *opts; 349 Error *local_err = NULL; 350 351 opts = qemu_opts_create(qemu_find_opts("chardev"), label, 1, &local_err); 352 if (local_err) { 353 error_report_err(local_err); 354 return NULL; 355 } 356 357 if (strstart(filename, "mon:", &p)) { 358 if (!permit_mux_mon) { 359 error_report("mon: isn't supported in this context"); 360 return NULL; 361 } 362 filename = p; 363 qemu_opt_set(opts, "mux", "on", &error_abort); 364 if (strcmp(filename, "stdio") == 0) { 365 /* Monitor is muxed to stdio: do not exit on Ctrl+C by default 366 * but pass it to the guest. Handle this only for compat syntax, 367 * for -chardev syntax we have special option for this. 368 * This is what -nographic did, redirecting+muxing serial+monitor 369 * to stdio causing Ctrl+C to be passed to guest. */ 370 qemu_opt_set(opts, "signal", "off", &error_abort); 371 } 372 } 373 374 if (strcmp(filename, "null") == 0 || 375 strcmp(filename, "pty") == 0 || 376 strcmp(filename, "msmouse") == 0 || 377 strcmp(filename, "wctablet") == 0 || 378 strcmp(filename, "braille") == 0 || 379 strcmp(filename, "testdev") == 0 || 380 strcmp(filename, "stdio") == 0) { 381 qemu_opt_set(opts, "backend", filename, &error_abort); 382 return opts; 383 } 384 if (strstart(filename, "vc", &p)) { 385 qemu_opt_set(opts, "backend", "vc", &error_abort); 386 if (*p == ':') { 387 if (sscanf(p+1, "%7[0-9]x%7[0-9]", width, height) == 2) { 388 /* pixels */ 389 qemu_opt_set(opts, "width", width, &error_abort); 390 qemu_opt_set(opts, "height", height, &error_abort); 391 } else if (sscanf(p+1, "%7[0-9]Cx%7[0-9]C", width, height) == 2) { 392 /* chars */ 393 qemu_opt_set(opts, "cols", width, &error_abort); 394 qemu_opt_set(opts, "rows", height, &error_abort); 395 } else { 396 goto fail; 397 } 398 } 399 return opts; 400 } 401 if (strcmp(filename, "con:") == 0) { 402 qemu_opt_set(opts, "backend", "console", &error_abort); 403 return opts; 404 } 405 if (strstart(filename, "COM", NULL)) { 406 qemu_opt_set(opts, "backend", "serial", &error_abort); 407 qemu_opt_set(opts, "path", filename, &error_abort); 408 return opts; 409 } 410 if (strstart(filename, "file:", &p)) { 411 qemu_opt_set(opts, "backend", "file", &error_abort); 412 qemu_opt_set(opts, "path", p, &error_abort); 413 return opts; 414 } 415 if (strstart(filename, "pipe:", &p)) { 416 qemu_opt_set(opts, "backend", "pipe", &error_abort); 417 qemu_opt_set(opts, "path", p, &error_abort); 418 return opts; 419 } 420 if (strstart(filename, "tcp:", &p) || 421 strstart(filename, "telnet:", &p) || 422 strstart(filename, "tn3270:", &p) || 423 strstart(filename, "websocket:", &p)) { 424 if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) { 425 host[0] = 0; 426 if (sscanf(p, ":%32[^,]%n", port, &pos) < 1) 427 goto fail; 428 } 429 qemu_opt_set(opts, "backend", "socket", &error_abort); 430 qemu_opt_set(opts, "host", host, &error_abort); 431 qemu_opt_set(opts, "port", port, &error_abort); 432 if (p[pos] == ',') { 433 if (!qemu_opts_do_parse(opts, p + pos + 1, NULL, &local_err)) { 434 error_report_err(local_err); 435 goto fail; 436 } 437 } 438 if (strstart(filename, "telnet:", &p)) { 439 qemu_opt_set(opts, "telnet", "on", &error_abort); 440 } else if (strstart(filename, "tn3270:", &p)) { 441 qemu_opt_set(opts, "tn3270", "on", &error_abort); 442 } else if (strstart(filename, "websocket:", &p)) { 443 qemu_opt_set(opts, "websocket", "on", &error_abort); 444 } 445 return opts; 446 } 447 if (strstart(filename, "udp:", &p)) { 448 qemu_opt_set(opts, "backend", "udp", &error_abort); 449 if (sscanf(p, "%64[^:]:%32[^@,]%n", host, port, &pos) < 2) { 450 host[0] = 0; 451 if (sscanf(p, ":%32[^@,]%n", port, &pos) < 1) { 452 goto fail; 453 } 454 } 455 qemu_opt_set(opts, "host", host, &error_abort); 456 qemu_opt_set(opts, "port", port, &error_abort); 457 if (p[pos] == '@') { 458 p += pos + 1; 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, "localaddr", host, &error_abort); 466 qemu_opt_set(opts, "localport", port, &error_abort); 467 } 468 return opts; 469 } 470 if (strstart(filename, "unix:", &p)) { 471 qemu_opt_set(opts, "backend", "socket", &error_abort); 472 if (!qemu_opts_do_parse(opts, p, "path", &local_err)) { 473 error_report_err(local_err); 474 goto fail; 475 } 476 return opts; 477 } 478 if (strstart(filename, "/dev/parport", NULL) || 479 strstart(filename, "/dev/ppi", NULL)) { 480 qemu_opt_set(opts, "backend", "parallel", &error_abort); 481 qemu_opt_set(opts, "path", filename, &error_abort); 482 return opts; 483 } 484 if (strstart(filename, "/dev/", NULL)) { 485 qemu_opt_set(opts, "backend", "serial", &error_abort); 486 qemu_opt_set(opts, "path", filename, &error_abort); 487 return opts; 488 } 489 490 error_report("'%s' is not a valid char driver", filename); 491 492 fail: 493 qemu_opts_del(opts); 494 return NULL; 495 } 496 497 void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend) 498 { 499 const char *logfile = qemu_opt_get(opts, "logfile"); 500 501 backend->has_logfile = logfile != NULL; 502 backend->logfile = g_strdup(logfile); 503 504 backend->has_logappend = true; 505 backend->logappend = qemu_opt_get_bool(opts, "logappend", false); 506 } 507 508 static const ChardevClass *char_get_class(const char *driver, Error **errp) 509 { 510 ObjectClass *oc; 511 const ChardevClass *cc; 512 char *typename = g_strdup_printf("chardev-%s", driver); 513 514 oc = module_object_class_by_name(typename); 515 g_free(typename); 516 517 if (!object_class_dynamic_cast(oc, TYPE_CHARDEV)) { 518 error_setg(errp, "'%s' is not a valid char driver name", driver); 519 return NULL; 520 } 521 522 if (object_class_is_abstract(oc)) { 523 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver", 524 "abstract device type"); 525 return NULL; 526 } 527 528 cc = CHARDEV_CLASS(oc); 529 if (cc->internal) { 530 error_setg(errp, "'%s' is not a valid char driver name", driver); 531 return NULL; 532 } 533 534 return cc; 535 } 536 537 static const struct ChardevAlias { 538 const char *typename; 539 const char *alias; 540 } chardev_alias_table[] = { 541 #ifdef HAVE_CHARDEV_PARPORT 542 { "parallel", "parport" }, 543 #endif 544 #ifdef HAVE_CHARDEV_SERIAL 545 { "serial", "tty" }, 546 #endif 547 }; 548 549 typedef struct ChadevClassFE { 550 void (*fn)(const char *name, void *opaque); 551 void *opaque; 552 } ChadevClassFE; 553 554 static void 555 chardev_class_foreach(ObjectClass *klass, void *opaque) 556 { 557 ChadevClassFE *fe = opaque; 558 559 assert(g_str_has_prefix(object_class_get_name(klass), "chardev-")); 560 if (CHARDEV_CLASS(klass)->internal) { 561 return; 562 } 563 564 fe->fn(object_class_get_name(klass) + 8, fe->opaque); 565 } 566 567 static void 568 chardev_name_foreach(void (*fn)(const char *name, void *opaque), void *opaque) 569 { 570 ChadevClassFE fe = { .fn = fn, .opaque = opaque }; 571 int i; 572 573 object_class_foreach(chardev_class_foreach, TYPE_CHARDEV, false, &fe); 574 575 for (i = 0; i < (int)ARRAY_SIZE(chardev_alias_table); i++) { 576 fn(chardev_alias_table[i].alias, opaque); 577 } 578 } 579 580 static void 581 help_string_append(const char *name, void *opaque) 582 { 583 GString *str = opaque; 584 585 g_string_append_printf(str, "\n %s", name); 586 } 587 588 static const char *chardev_alias_translate(const char *name) 589 { 590 int i; 591 for (i = 0; i < (int)ARRAY_SIZE(chardev_alias_table); i++) { 592 if (g_strcmp0(chardev_alias_table[i].alias, name) == 0) { 593 return chardev_alias_table[i].typename; 594 } 595 } 596 return name; 597 } 598 599 ChardevBackend *qemu_chr_parse_opts(QemuOpts *opts, Error **errp) 600 { 601 Error *local_err = NULL; 602 const ChardevClass *cc; 603 ChardevBackend *backend = NULL; 604 const char *name = chardev_alias_translate(qemu_opt_get(opts, "backend")); 605 606 if (name == NULL) { 607 error_setg(errp, "chardev: \"%s\" missing backend", 608 qemu_opts_id(opts)); 609 return NULL; 610 } 611 612 cc = char_get_class(name, errp); 613 if (cc == NULL) { 614 return NULL; 615 } 616 617 backend = g_new0(ChardevBackend, 1); 618 backend->type = CHARDEV_BACKEND_KIND_NULL; 619 620 if (cc->parse) { 621 cc->parse(opts, backend, &local_err); 622 if (local_err) { 623 error_propagate(errp, local_err); 624 qapi_free_ChardevBackend(backend); 625 return NULL; 626 } 627 } else { 628 ChardevCommon *ccom = g_new0(ChardevCommon, 1); 629 qemu_chr_parse_common(opts, ccom); 630 backend->u.null.data = ccom; /* Any ChardevCommon member would work */ 631 } 632 633 return backend; 634 } 635 636 Chardev *qemu_chr_new_from_opts(QemuOpts *opts, GMainContext *context, 637 Error **errp) 638 { 639 const ChardevClass *cc; 640 Chardev *chr = NULL; 641 ChardevBackend *backend = NULL; 642 const char *name = chardev_alias_translate(qemu_opt_get(opts, "backend")); 643 const char *id = qemu_opts_id(opts); 644 char *bid = NULL; 645 646 if (name && is_help_option(name)) { 647 GString *str = g_string_new(""); 648 649 chardev_name_foreach(help_string_append, str); 650 651 qemu_printf("Available chardev backend types: %s\n", str->str); 652 g_string_free(str, true); 653 return NULL; 654 } 655 656 if (id == NULL) { 657 error_setg(errp, "chardev: no id specified"); 658 return NULL; 659 } 660 661 backend = qemu_chr_parse_opts(opts, errp); 662 if (backend == NULL) { 663 return NULL; 664 } 665 666 cc = char_get_class(name, errp); 667 if (cc == NULL) { 668 goto out; 669 } 670 671 if (qemu_opt_get_bool(opts, "mux", 0)) { 672 bid = g_strdup_printf("%s-base", id); 673 } 674 675 chr = qemu_chardev_new(bid ? bid : id, 676 object_class_get_name(OBJECT_CLASS(cc)), 677 backend, context, errp); 678 679 if (chr == NULL) { 680 goto out; 681 } 682 683 if (bid) { 684 Chardev *mux; 685 qapi_free_ChardevBackend(backend); 686 backend = g_new0(ChardevBackend, 1); 687 backend->type = CHARDEV_BACKEND_KIND_MUX; 688 backend->u.mux.data = g_new0(ChardevMux, 1); 689 backend->u.mux.data->chardev = g_strdup(bid); 690 mux = qemu_chardev_new(id, TYPE_CHARDEV_MUX, backend, context, errp); 691 if (mux == NULL) { 692 object_unparent(OBJECT(chr)); 693 chr = NULL; 694 goto out; 695 } 696 chr = mux; 697 } 698 699 out: 700 qapi_free_ChardevBackend(backend); 701 g_free(bid); 702 return chr; 703 } 704 705 Chardev *qemu_chr_new_noreplay(const char *label, const char *filename, 706 bool permit_mux_mon, GMainContext *context) 707 { 708 const char *p; 709 Chardev *chr; 710 QemuOpts *opts; 711 Error *err = NULL; 712 713 if (strstart(filename, "chardev:", &p)) { 714 return qemu_chr_find(p); 715 } 716 717 opts = qemu_chr_parse_compat(label, filename, permit_mux_mon); 718 if (!opts) 719 return NULL; 720 721 chr = qemu_chr_new_from_opts(opts, context, &err); 722 if (!chr) { 723 error_report_err(err); 724 goto out; 725 } 726 727 if (qemu_opt_get_bool(opts, "mux", 0)) { 728 assert(permit_mux_mon); 729 monitor_init_hmp(chr, true, &err); 730 if (err) { 731 error_report_err(err); 732 object_unparent(OBJECT(chr)); 733 chr = NULL; 734 goto out; 735 } 736 } 737 738 out: 739 qemu_opts_del(opts); 740 return chr; 741 } 742 743 static Chardev *qemu_chr_new_permit_mux_mon(const char *label, 744 const char *filename, 745 bool permit_mux_mon, 746 GMainContext *context) 747 { 748 Chardev *chr; 749 chr = qemu_chr_new_noreplay(label, filename, permit_mux_mon, context); 750 if (chr) { 751 if (replay_mode != REPLAY_MODE_NONE) { 752 qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_REPLAY); 753 } 754 if (qemu_chr_replay(chr) && CHARDEV_GET_CLASS(chr)->chr_ioctl) { 755 error_report("Replay: ioctl is not supported " 756 "for serial devices yet"); 757 } 758 replay_register_char_driver(chr); 759 } 760 return chr; 761 } 762 763 Chardev *qemu_chr_new(const char *label, const char *filename, 764 GMainContext *context) 765 { 766 return qemu_chr_new_permit_mux_mon(label, filename, false, context); 767 } 768 769 Chardev *qemu_chr_new_mux_mon(const char *label, const char *filename, 770 GMainContext *context) 771 { 772 return qemu_chr_new_permit_mux_mon(label, filename, true, context); 773 } 774 775 static int qmp_query_chardev_foreach(Object *obj, void *data) 776 { 777 Chardev *chr = CHARDEV(obj); 778 ChardevInfoList **list = data; 779 ChardevInfoList *info = g_malloc0(sizeof(*info)); 780 781 info->value = g_malloc0(sizeof(*info->value)); 782 info->value->label = g_strdup(chr->label); 783 info->value->filename = g_strdup(chr->filename); 784 info->value->frontend_open = chr->be && chr->be->fe_open; 785 786 info->next = *list; 787 *list = info; 788 789 return 0; 790 } 791 792 ChardevInfoList *qmp_query_chardev(Error **errp) 793 { 794 ChardevInfoList *chr_list = NULL; 795 796 object_child_foreach(get_chardevs_root(), 797 qmp_query_chardev_foreach, &chr_list); 798 799 return chr_list; 800 } 801 802 static void 803 qmp_prepend_backend(const char *name, void *opaque) 804 { 805 ChardevBackendInfoList **list = opaque; 806 ChardevBackendInfoList *info = g_malloc0(sizeof(*info)); 807 808 info->value = g_malloc0(sizeof(*info->value)); 809 info->value->name = g_strdup(name); 810 info->next = *list; 811 *list = info; 812 } 813 814 ChardevBackendInfoList *qmp_query_chardev_backends(Error **errp) 815 { 816 ChardevBackendInfoList *backend_list = NULL; 817 818 chardev_name_foreach(qmp_prepend_backend, &backend_list); 819 820 return backend_list; 821 } 822 823 Chardev *qemu_chr_find(const char *name) 824 { 825 Object *obj = object_resolve_path_component(get_chardevs_root(), name); 826 827 return obj ? CHARDEV(obj) : NULL; 828 } 829 830 QemuOptsList qemu_chardev_opts = { 831 .name = "chardev", 832 .implied_opt_name = "backend", 833 .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head), 834 .desc = { 835 { 836 .name = "backend", 837 .type = QEMU_OPT_STRING, 838 },{ 839 .name = "path", 840 .type = QEMU_OPT_STRING, 841 },{ 842 .name = "host", 843 .type = QEMU_OPT_STRING, 844 },{ 845 .name = "port", 846 .type = QEMU_OPT_STRING, 847 },{ 848 .name = "fd", 849 .type = QEMU_OPT_STRING, 850 },{ 851 .name = "localaddr", 852 .type = QEMU_OPT_STRING, 853 },{ 854 .name = "localport", 855 .type = QEMU_OPT_STRING, 856 },{ 857 .name = "to", 858 .type = QEMU_OPT_NUMBER, 859 },{ 860 .name = "ipv4", 861 .type = QEMU_OPT_BOOL, 862 },{ 863 .name = "ipv6", 864 .type = QEMU_OPT_BOOL, 865 },{ 866 .name = "wait", 867 .type = QEMU_OPT_BOOL, 868 },{ 869 .name = "server", 870 .type = QEMU_OPT_BOOL, 871 },{ 872 .name = "delay", 873 .type = QEMU_OPT_BOOL, 874 },{ 875 .name = "reconnect", 876 .type = QEMU_OPT_NUMBER, 877 },{ 878 .name = "telnet", 879 .type = QEMU_OPT_BOOL, 880 },{ 881 .name = "tn3270", 882 .type = QEMU_OPT_BOOL, 883 },{ 884 .name = "tls-creds", 885 .type = QEMU_OPT_STRING, 886 },{ 887 .name = "tls-authz", 888 .type = QEMU_OPT_STRING, 889 },{ 890 .name = "websocket", 891 .type = QEMU_OPT_BOOL, 892 },{ 893 .name = "width", 894 .type = QEMU_OPT_NUMBER, 895 },{ 896 .name = "height", 897 .type = QEMU_OPT_NUMBER, 898 },{ 899 .name = "cols", 900 .type = QEMU_OPT_NUMBER, 901 },{ 902 .name = "rows", 903 .type = QEMU_OPT_NUMBER, 904 },{ 905 .name = "mux", 906 .type = QEMU_OPT_BOOL, 907 },{ 908 .name = "signal", 909 .type = QEMU_OPT_BOOL, 910 },{ 911 .name = "name", 912 .type = QEMU_OPT_STRING, 913 },{ 914 .name = "debug", 915 .type = QEMU_OPT_NUMBER, 916 },{ 917 .name = "size", 918 .type = QEMU_OPT_SIZE, 919 },{ 920 .name = "chardev", 921 .type = QEMU_OPT_STRING, 922 },{ 923 .name = "append", 924 .type = QEMU_OPT_BOOL, 925 },{ 926 .name = "logfile", 927 .type = QEMU_OPT_STRING, 928 },{ 929 .name = "logappend", 930 .type = QEMU_OPT_BOOL, 931 #ifdef CONFIG_LINUX 932 },{ 933 .name = "tight", 934 .type = QEMU_OPT_BOOL, 935 .def_value_str = "on", 936 },{ 937 .name = "abstract", 938 .type = QEMU_OPT_BOOL, 939 #endif 940 }, 941 { /* end of list */ } 942 }, 943 }; 944 945 bool qemu_chr_has_feature(Chardev *chr, 946 ChardevFeature feature) 947 { 948 return test_bit(feature, chr->features); 949 } 950 951 void qemu_chr_set_feature(Chardev *chr, 952 ChardevFeature feature) 953 { 954 return set_bit(feature, chr->features); 955 } 956 957 static Chardev *chardev_new(const char *id, const char *typename, 958 ChardevBackend *backend, 959 GMainContext *gcontext, 960 Error **errp) 961 { 962 Object *obj; 963 Chardev *chr = NULL; 964 Error *local_err = NULL; 965 bool be_opened = true; 966 967 assert(g_str_has_prefix(typename, "chardev-")); 968 969 obj = object_new(typename); 970 chr = CHARDEV(obj); 971 chr->label = g_strdup(id); 972 chr->gcontext = gcontext; 973 974 qemu_char_open(chr, backend, &be_opened, &local_err); 975 if (local_err) { 976 goto end; 977 } 978 979 if (!chr->filename) { 980 chr->filename = g_strdup(typename + 8); 981 } 982 if (be_opened) { 983 qemu_chr_be_event(chr, CHR_EVENT_OPENED); 984 } 985 986 if (id) { 987 object_property_try_add_child(get_chardevs_root(), id, obj, 988 &local_err); 989 if (local_err) { 990 goto end; 991 } 992 object_unref(obj); 993 } 994 995 end: 996 if (local_err) { 997 error_propagate(errp, local_err); 998 object_unref(obj); 999 return NULL; 1000 } 1001 1002 return chr; 1003 } 1004 1005 Chardev *qemu_chardev_new(const char *id, const char *typename, 1006 ChardevBackend *backend, 1007 GMainContext *gcontext, 1008 Error **errp) 1009 { 1010 g_autofree char *genid = NULL; 1011 1012 if (!id) { 1013 genid = id_generate(ID_CHR); 1014 id = genid; 1015 } 1016 1017 return chardev_new(id, typename, backend, gcontext, errp); 1018 } 1019 1020 ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend, 1021 Error **errp) 1022 { 1023 const ChardevClass *cc; 1024 ChardevReturn *ret; 1025 Chardev *chr; 1026 1027 cc = char_get_class(ChardevBackendKind_str(backend->type), errp); 1028 if (!cc) { 1029 return NULL; 1030 } 1031 1032 chr = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc)), 1033 backend, NULL, errp); 1034 if (!chr) { 1035 return NULL; 1036 } 1037 1038 ret = g_new0(ChardevReturn, 1); 1039 if (CHARDEV_IS_PTY(chr)) { 1040 ret->pty = g_strdup(chr->filename + 4); 1041 ret->has_pty = true; 1042 } 1043 1044 return ret; 1045 } 1046 1047 ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, 1048 Error **errp) 1049 { 1050 CharBackend *be; 1051 const ChardevClass *cc; 1052 Chardev *chr, *chr_new; 1053 bool closed_sent = false; 1054 ChardevReturn *ret; 1055 1056 chr = qemu_chr_find(id); 1057 if (!chr) { 1058 error_setg(errp, "Chardev '%s' does not exist", id); 1059 return NULL; 1060 } 1061 1062 if (CHARDEV_IS_MUX(chr)) { 1063 error_setg(errp, "Mux device hotswap not supported yet"); 1064 return NULL; 1065 } 1066 1067 if (qemu_chr_replay(chr)) { 1068 error_setg(errp, 1069 "Chardev '%s' cannot be changed in record/replay mode", id); 1070 return NULL; 1071 } 1072 1073 be = chr->be; 1074 if (!be) { 1075 /* easy case */ 1076 object_unparent(OBJECT(chr)); 1077 return qmp_chardev_add(id, backend, errp); 1078 } 1079 1080 if (!be->chr_be_change) { 1081 error_setg(errp, "Chardev user does not support chardev hotswap"); 1082 return NULL; 1083 } 1084 1085 cc = char_get_class(ChardevBackendKind_str(backend->type), errp); 1086 if (!cc) { 1087 return NULL; 1088 } 1089 1090 chr_new = chardev_new(NULL, object_class_get_name(OBJECT_CLASS(cc)), 1091 backend, chr->gcontext, errp); 1092 if (!chr_new) { 1093 return NULL; 1094 } 1095 chr_new->label = g_strdup(id); 1096 1097 if (chr->be_open && !chr_new->be_open) { 1098 qemu_chr_be_event(chr, CHR_EVENT_CLOSED); 1099 closed_sent = true; 1100 } 1101 1102 chr->be = NULL; 1103 qemu_chr_fe_init(be, chr_new, &error_abort); 1104 1105 if (be->chr_be_change(be->opaque) < 0) { 1106 error_setg(errp, "Chardev '%s' change failed", chr_new->label); 1107 chr_new->be = NULL; 1108 qemu_chr_fe_init(be, chr, &error_abort); 1109 if (closed_sent) { 1110 qemu_chr_be_event(chr, CHR_EVENT_OPENED); 1111 } 1112 object_unref(OBJECT(chr_new)); 1113 return NULL; 1114 } 1115 1116 object_unparent(OBJECT(chr)); 1117 object_property_add_child(get_chardevs_root(), chr_new->label, 1118 OBJECT(chr_new)); 1119 object_unref(OBJECT(chr_new)); 1120 1121 ret = g_new0(ChardevReturn, 1); 1122 if (CHARDEV_IS_PTY(chr_new)) { 1123 ret->pty = g_strdup(chr_new->filename + 4); 1124 ret->has_pty = true; 1125 } 1126 1127 return ret; 1128 } 1129 1130 void qmp_chardev_remove(const char *id, Error **errp) 1131 { 1132 Chardev *chr; 1133 1134 chr = qemu_chr_find(id); 1135 if (chr == NULL) { 1136 error_setg(errp, "Chardev '%s' not found", id); 1137 return; 1138 } 1139 if (qemu_chr_is_busy(chr)) { 1140 error_setg(errp, "Chardev '%s' is busy", id); 1141 return; 1142 } 1143 if (qemu_chr_replay(chr)) { 1144 error_setg(errp, 1145 "Chardev '%s' cannot be unplugged in record/replay mode", id); 1146 return; 1147 } 1148 object_unparent(OBJECT(chr)); 1149 } 1150 1151 void qmp_chardev_send_break(const char *id, Error **errp) 1152 { 1153 Chardev *chr; 1154 1155 chr = qemu_chr_find(id); 1156 if (chr == NULL) { 1157 error_setg(errp, "Chardev '%s' not found", id); 1158 return; 1159 } 1160 qemu_chr_be_event(chr, CHR_EVENT_BREAK); 1161 } 1162 1163 /* 1164 * Add a timeout callback for the chardev (in milliseconds), return 1165 * the GSource object created. Please use this to add timeout hook for 1166 * chardev instead of g_timeout_add() and g_timeout_add_seconds(), to 1167 * make sure the gcontext that the task bound to is correct. 1168 */ 1169 GSource *qemu_chr_timeout_add_ms(Chardev *chr, guint ms, 1170 GSourceFunc func, void *private) 1171 { 1172 GSource *source = g_timeout_source_new(ms); 1173 1174 assert(func); 1175 g_source_set_callback(source, func, private, NULL); 1176 g_source_attach(source, chr->gcontext); 1177 1178 return source; 1179 } 1180 1181 void qemu_chr_cleanup(void) 1182 { 1183 object_unparent(get_chardevs_root()); 1184 } 1185 1186 static void register_types(void) 1187 { 1188 type_register_static(&char_type_info); 1189 } 1190 1191 type_init(register_types); 1192