chardev/char.c

   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                    "an 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     ChardevInfo *value = g_malloc0(sizeof(*value));
 780
 781     value->label = g_strdup(chr->label);
 782     value->filename = g_strdup(chr->filename);
 783     value->frontend_open = chr->be && chr->be->fe_open;
 784
 785     QAPI_LIST_PREPEND(*list, value);
 786
 787     return 0;
 788 }
 789
 790 ChardevInfoList *qmp_query_chardev(Error **errp)
 791 {
 792     ChardevInfoList *chr_list = NULL;
 793
 794     object_child_foreach(get_chardevs_root(),
 795                          qmp_query_chardev_foreach, &chr_list);
 796
 797     return chr_list;
 798 }
 799
 800 static void
 801 qmp_prepend_backend(const char *name, void *opaque)
 802 {
 803     ChardevBackendInfoList **list = opaque;
 804     ChardevBackendInfo *value = g_new0(ChardevBackendInfo, 1);
 805
 806     value->name = g_strdup(name);
 807     QAPI_LIST_PREPEND(*list, value);
 808 }
 809
 810 ChardevBackendInfoList *qmp_query_chardev_backends(Error **errp)
 811 {
 812     ChardevBackendInfoList *backend_list = NULL;
 813
 814     chardev_name_foreach(qmp_prepend_backend, &backend_list);
 815
 816     return backend_list;
 817 }
 818
 819 Chardev *qemu_chr_find(const char *name)
 820 {
 821     Object *obj = object_resolve_path_component(get_chardevs_root(), name);
 822
 823     return obj ? CHARDEV(obj) : NULL;
 824 }
 825
 826 QemuOptsList qemu_chardev_opts = {
 827     .name = "chardev",
 828     .implied_opt_name = "backend",
 829     .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head),
 830     .desc = {
 831         {
 832             .name = "backend",
 833             .type = QEMU_OPT_STRING,
 834         },{
 835             .name = "path",
 836             .type = QEMU_OPT_STRING,
 837         },{
 838             .name = "host",
 839             .type = QEMU_OPT_STRING,
 840         },{
 841             .name = "port",
 842             .type = QEMU_OPT_STRING,
 843         },{
 844             .name = "fd",
 845             .type = QEMU_OPT_STRING,
 846         },{
 847             .name = "localaddr",
 848             .type = QEMU_OPT_STRING,
 849         },{
 850             .name = "localport",
 851             .type = QEMU_OPT_STRING,
 852         },{
 853             .name = "to",
 854             .type = QEMU_OPT_NUMBER,
 855         },{
 856             .name = "ipv4",
 857             .type = QEMU_OPT_BOOL,
 858         },{
 859             .name = "ipv6",
 860             .type = QEMU_OPT_BOOL,
 861         },{
 862             .name = "wait",
 863             .type = QEMU_OPT_BOOL,
 864         },{
 865             .name = "server",
 866             .type = QEMU_OPT_BOOL,
 867         },{
 868             .name = "delay",
 869             .type = QEMU_OPT_BOOL,
 870         },{
 871             .name = "reconnect",
 872             .type = QEMU_OPT_NUMBER,
 873         },{
 874             .name = "telnet",
 875             .type = QEMU_OPT_BOOL,
 876         },{
 877             .name = "tn3270",
 878             .type = QEMU_OPT_BOOL,
 879         },{
 880             .name = "tls-creds",
 881             .type = QEMU_OPT_STRING,
 882         },{
 883             .name = "tls-authz",
 884             .type = QEMU_OPT_STRING,
 885         },{
 886             .name = "websocket",
 887             .type = QEMU_OPT_BOOL,
 888         },{
 889             .name = "width",
 890             .type = QEMU_OPT_NUMBER,
 891         },{
 892             .name = "height",
 893             .type = QEMU_OPT_NUMBER,
 894         },{
 895             .name = "cols",
 896             .type = QEMU_OPT_NUMBER,
 897         },{
 898             .name = "rows",
 899             .type = QEMU_OPT_NUMBER,
 900         },{
 901             .name = "mux",
 902             .type = QEMU_OPT_BOOL,
 903         },{
 904             .name = "signal",
 905             .type = QEMU_OPT_BOOL,
 906         },{
 907             .name = "name",
 908             .type = QEMU_OPT_STRING,
 909         },{
 910             .name = "debug",
 911             .type = QEMU_OPT_NUMBER,
 912         },{
 913             .name = "size",
 914             .type = QEMU_OPT_SIZE,
 915         },{
 916             .name = "chardev",
 917             .type = QEMU_OPT_STRING,
 918         },{
 919             .name = "append",
 920             .type = QEMU_OPT_BOOL,
 921         },{
 922             .name = "logfile",
 923             .type = QEMU_OPT_STRING,
 924         },{
 925             .name = "logappend",
 926             .type = QEMU_OPT_BOOL,
 927 #ifdef CONFIG_LINUX
 928         },{
 929             .name = "tight",
 930             .type = QEMU_OPT_BOOL,
 931             .def_value_str = "on",
 932         },{
 933             .name = "abstract",
 934             .type = QEMU_OPT_BOOL,
 935 #endif
 936         },
 937         { /* end of list */ }
 938     },
 939 };
 940
 941 bool qemu_chr_has_feature(Chardev *chr,
 942                           ChardevFeature feature)
 943 {
 944     return test_bit(feature, chr->features);
 945 }
 946
 947 void qemu_chr_set_feature(Chardev *chr,
 948                            ChardevFeature feature)
 949 {
 950     return set_bit(feature, chr->features);
 951 }
 952
 953 static Chardev *chardev_new(const char *id, const char *typename,
 954                             ChardevBackend *backend,
 955                             GMainContext *gcontext,
 956                             Error **errp)
 957 {
 958     Object *obj;
 959     Chardev *chr = NULL;
 960     Error *local_err = NULL;
 961     bool be_opened = true;
 962
 963     assert(g_str_has_prefix(typename, "chardev-"));
 964
 965     obj = object_new(typename);
 966     chr = CHARDEV(obj);
 967     chr->label = g_strdup(id);
 968     chr->gcontext = gcontext;
 969
 970     qemu_char_open(chr, backend, &be_opened, &local_err);
 971     if (local_err) {
 972         goto end;
 973     }
 974
 975     if (!chr->filename) {
 976         chr->filename = g_strdup(typename + 8);
 977     }
 978     if (be_opened) {
 979         qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 980     }
 981
 982     if (id) {
 983         object_property_try_add_child(get_chardevs_root(), id, obj,
 984                                       &local_err);
 985         if (local_err) {
 986             goto end;
 987         }
 988         object_unref(obj);
 989     }
 990
 991 end:
 992     if (local_err) {
 993         error_propagate(errp, local_err);
 994         object_unref(obj);
 995         return NULL;
 996     }
 997
 998     return chr;
 999 }
1000
1001 Chardev *qemu_chardev_new(const char *id, const char *typename,
1002                           ChardevBackend *backend,
1003                           GMainContext *gcontext,
1004                           Error **errp)
1005 {
1006     g_autofree char *genid = NULL;
1007
1008     if (!id) {
1009         genid = id_generate(ID_CHR);
1010         id = genid;
1011     }
1012
1013     return chardev_new(id, typename, backend, gcontext, errp);
1014 }
1015
1016 ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
1017                                Error **errp)
1018 {
1019     const ChardevClass *cc;
1020     ChardevReturn *ret;
1021     Chardev *chr;
1022
1023     cc = char_get_class(ChardevBackendKind_str(backend->type), errp);
1024     if (!cc) {
1025         return NULL;
1026     }
1027
1028     chr = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc)),
1029                       backend, NULL, errp);
1030     if (!chr) {
1031         return NULL;
1032     }
1033
1034     ret = g_new0(ChardevReturn, 1);
1035     if (CHARDEV_IS_PTY(chr)) {
1036         ret->pty = g_strdup(chr->filename + 4);
1037         ret->has_pty = true;
1038     }
1039
1040     return ret;
1041 }
1042
1043 ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend,
1044                                   Error **errp)
1045 {
1046     CharBackend *be;
1047     const ChardevClass *cc;
1048     Chardev *chr, *chr_new;
1049     bool closed_sent = false;
1050     ChardevReturn *ret;
1051
1052     chr = qemu_chr_find(id);
1053     if (!chr) {
1054         error_setg(errp, "Chardev '%s' does not exist", id);
1055         return NULL;
1056     }
1057
1058     if (CHARDEV_IS_MUX(chr)) {
1059         error_setg(errp, "Mux device hotswap not supported yet");
1060         return NULL;
1061     }
1062
1063     if (qemu_chr_replay(chr)) {
1064         error_setg(errp,
1065             "Chardev '%s' cannot be changed in record/replay mode", id);
1066         return NULL;
1067     }
1068
1069     be = chr->be;
1070     if (!be) {
1071         /* easy case */
1072         object_unparent(OBJECT(chr));
1073         return qmp_chardev_add(id, backend, errp);
1074     }
1075
1076     if (!be->chr_be_change) {
1077         error_setg(errp, "Chardev user does not support chardev hotswap");
1078         return NULL;
1079     }
1080
1081     cc = char_get_class(ChardevBackendKind_str(backend->type), errp);
1082     if (!cc) {
1083         return NULL;
1084     }
1085
1086     chr_new = chardev_new(NULL, object_class_get_name(OBJECT_CLASS(cc)),
1087                           backend, chr->gcontext, errp);
1088     if (!chr_new) {
1089         return NULL;
1090     }
1091     chr_new->label = g_strdup(id);
1092
1093     if (chr->be_open && !chr_new->be_open) {
1094         qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
1095         closed_sent = true;
1096     }
1097
1098     chr->be = NULL;
1099     qemu_chr_fe_init(be, chr_new, &error_abort);
1100
1101     if (be->chr_be_change(be->opaque) < 0) {
1102         error_setg(errp, "Chardev '%s' change failed", chr_new->label);
1103         chr_new->be = NULL;
1104         qemu_chr_fe_init(be, chr, &error_abort);
1105         if (closed_sent) {
1106             qemu_chr_be_event(chr, CHR_EVENT_OPENED);
1107         }
1108         object_unref(OBJECT(chr_new));
1109         return NULL;
1110     }
1111
1112     object_unparent(OBJECT(chr));
1113     object_property_add_child(get_chardevs_root(), chr_new->label,
1114                               OBJECT(chr_new));
1115     object_unref(OBJECT(chr_new));
1116
1117     ret = g_new0(ChardevReturn, 1);
1118     if (CHARDEV_IS_PTY(chr_new)) {
1119         ret->pty = g_strdup(chr_new->filename + 4);
1120         ret->has_pty = true;
1121     }
1122
1123     return ret;
1124 }
1125
1126 void qmp_chardev_remove(const char *id, Error **errp)
1127 {
1128     Chardev *chr;
1129
1130     chr = qemu_chr_find(id);
1131     if (chr == NULL) {
1132         error_setg(errp, "Chardev '%s' not found", id);
1133         return;
1134     }
1135     if (qemu_chr_is_busy(chr)) {
1136         error_setg(errp, "Chardev '%s' is busy", id);
1137         return;
1138     }
1139     if (qemu_chr_replay(chr)) {
1140         error_setg(errp,
1141             "Chardev '%s' cannot be unplugged in record/replay mode", id);
1142         return;
1143     }
1144     object_unparent(OBJECT(chr));
1145 }
1146
1147 void qmp_chardev_send_break(const char *id, Error **errp)
1148 {
1149     Chardev *chr;
1150
1151     chr = qemu_chr_find(id);
1152     if (chr == NULL) {
1153         error_setg(errp, "Chardev '%s' not found", id);
1154         return;
1155     }
1156     qemu_chr_be_event(chr, CHR_EVENT_BREAK);
1157 }
1158
1159 /*
1160  * Add a timeout callback for the chardev (in milliseconds), return
1161  * the GSource object created. Please use this to add timeout hook for
1162  * chardev instead of g_timeout_add() and g_timeout_add_seconds(), to
1163  * make sure the gcontext that the task bound to is correct.
1164  */
1165 GSource *qemu_chr_timeout_add_ms(Chardev *chr, guint ms,
1166                                  GSourceFunc func, void *private)
1167 {
1168     GSource *source = g_timeout_source_new(ms);
1169
1170     assert(func);
1171     g_source_set_callback(source, func, private, NULL);
1172     g_source_attach(source, chr->gcontext);
1173
1174     return source;
1175 }
1176
1177 void qemu_chr_cleanup(void)
1178 {
1179     object_unparent(get_chardevs_root());
1180 }
1181
1182 static void register_types(void)
1183 {
1184     type_register_static(&char_type_info);
1185 }
1186
1187 type_init(register_types);