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 #include "qemu/osdep.h"
  25 #include "qemu-common.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 "sysemu/char.h"
  32 #include "qmp-commands.h"
  33 #include "qapi-visit.h"
  34 #include "sysemu/replay.h"
  35 #include "qemu/help_option.h"
  36
  37 #include "char-mux.h"
  38 #include "char-io.h"
  39 #include "char-parallel.h"
  40 #include "char-serial.h"
  41
  42 /***********************************************************/
  43 /* character device */
  44
  45 static Object *get_chardevs_root(void)
  46 {
  47     return container_get(object_get_root(), "/chardevs");
  48 }
  49
  50 void qemu_chr_be_event(Chardev *s, int event)
  51 {
  52     CharBackend *be = s->be;
  53
  54     /* Keep track if the char device is open */
  55     switch (event) {
  56         case CHR_EVENT_OPENED:
  57             s->be_open = 1;
  58             break;
  59         case CHR_EVENT_CLOSED:
  60             s->be_open = 0;
  61             break;
  62     }
  63
  64     if (!be || !be->chr_event) {
  65         return;
  66     }
  67
  68     be->chr_event(be->opaque, event);
  69 }
  70
  71 /* Not reporting errors from writing to logfile, as logs are
  72  * defined to be "best effort" only */
  73 static void qemu_chr_fe_write_log(Chardev *s,
  74                                   const uint8_t *buf, size_t len)
  75 {
  76     size_t done = 0;
  77     ssize_t ret;
  78
  79     if (s->logfd < 0) {
  80         return;
  81     }
  82
  83     while (done < len) {
  84     retry:
  85         ret = write(s->logfd, buf + done, len - done);
  86         if (ret == -1 && errno == EAGAIN) {
  87             g_usleep(100);
  88             goto retry;
  89         }
  90
  91         if (ret <= 0) {
  92             return;
  93         }
  94         done += ret;
  95     }
  96 }
  97
  98 static int qemu_chr_fe_write_buffer(Chardev *s,
  99                                     const uint8_t *buf, int len, int *offset)
 100 {
 101     ChardevClass *cc = CHARDEV_GET_CLASS(s);
 102     int res = 0;
 103     *offset = 0;
 104
 105     qemu_mutex_lock(&s->chr_write_lock);
 106     while (*offset < len) {
 107     retry:
 108         res = cc->chr_write(s, buf + *offset, len - *offset);
 109         if (res < 0 && errno == EAGAIN) {
 110             g_usleep(100);
 111             goto retry;
 112         }
 113
 114         if (res <= 0) {
 115             break;
 116         }
 117
 118         *offset += res;
 119     }
 120     if (*offset > 0) {
 121         qemu_chr_fe_write_log(s, buf, *offset);
 122     }
 123     qemu_mutex_unlock(&s->chr_write_lock);
 124
 125     return res;
 126 }
 127
 128 static bool qemu_chr_replay(Chardev *chr)
 129 {
 130     return qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_REPLAY);
 131 }
 132
 133 int qemu_chr_fe_write(CharBackend *be, const uint8_t *buf, int len)
 134 {
 135     Chardev *s = be->chr;
 136     ChardevClass *cc;
 137     int ret;
 138
 139     if (!s) {
 140         return 0;
 141     }
 142
 143     if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) {
 144         int offset;
 145         replay_char_write_event_load(&ret, &offset);
 146         assert(offset <= len);
 147         qemu_chr_fe_write_buffer(s, buf, offset, &offset);
 148         return ret;
 149     }
 150
 151     cc = CHARDEV_GET_CLASS(s);
 152     qemu_mutex_lock(&s->chr_write_lock);
 153     ret = cc->chr_write(s, buf, len);
 154
 155     if (ret > 0) {
 156         qemu_chr_fe_write_log(s, buf, ret);
 157     }
 158
 159     qemu_mutex_unlock(&s->chr_write_lock);
 160
 161     if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
 162         replay_char_write_event_save(ret, ret < 0 ? 0 : ret);
 163     }
 164
 165     return ret;
 166 }
 167
 168 int qemu_chr_write_all(Chardev *s, const uint8_t *buf, int len)
 169 {
 170     int offset;
 171     int res;
 172
 173     if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) {
 174         replay_char_write_event_load(&res, &offset);
 175         assert(offset <= len);
 176         qemu_chr_fe_write_buffer(s, buf, offset, &offset);
 177         return res;
 178     }
 179
 180     res = qemu_chr_fe_write_buffer(s, buf, len, &offset);
 181
 182     if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
 183         replay_char_write_event_save(res, offset);
 184     }
 185
 186     if (res < 0) {
 187         return res;
 188     }
 189     return offset;
 190 }
 191
 192 int qemu_chr_fe_write_all(CharBackend *be, const uint8_t *buf, int len)
 193 {
 194     Chardev *s = be->chr;
 195
 196     if (!s) {
 197         return 0;
 198     }
 199
 200     return qemu_chr_write_all(s, buf, len);
 201 }
 202
 203 int qemu_chr_fe_read_all(CharBackend *be, uint8_t *buf, int len)
 204 {
 205     Chardev *s = be->chr;
 206     int offset = 0, counter = 10;
 207     int res;
 208
 209     if (!s || !CHARDEV_GET_CLASS(s)->chr_sync_read) {
 210         return 0;
 211     }
 212
 213     if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) {
 214         return replay_char_read_all_load(buf);
 215     }
 216
 217     while (offset < len) {
 218     retry:
 219         res = CHARDEV_GET_CLASS(s)->chr_sync_read(s, buf + offset,
 220                                                   len - offset);
 221         if (res == -1 && errno == EAGAIN) {
 222             g_usleep(100);
 223             goto retry;
 224         }
 225
 226         if (res == 0) {
 227             break;
 228         }
 229
 230         if (res < 0) {
 231             if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
 232                 replay_char_read_all_save_error(res);
 233             }
 234             return res;
 235         }
 236
 237         offset += res;
 238
 239         if (!counter--) {
 240             break;
 241         }
 242     }
 243
 244     if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) {
 245         replay_char_read_all_save_buf(buf, offset);
 246     }
 247     return offset;
 248 }
 249
 250 int qemu_chr_fe_ioctl(CharBackend *be, int cmd, void *arg)
 251 {
 252     Chardev *s = be->chr;
 253     int res;
 254
 255     if (!s || !CHARDEV_GET_CLASS(s)->chr_ioctl || qemu_chr_replay(s)) {
 256         res = -ENOTSUP;
 257     } else {
 258         res = CHARDEV_GET_CLASS(s)->chr_ioctl(s, cmd, arg);
 259     }
 260
 261     return res;
 262 }
 263
 264 int qemu_chr_be_can_write(Chardev *s)
 265 {
 266     CharBackend *be = s->be;
 267
 268     if (!be || !be->chr_can_read) {
 269         return 0;
 270     }
 271
 272     return be->chr_can_read(be->opaque);
 273 }
 274
 275 void qemu_chr_be_write_impl(Chardev *s, uint8_t *buf, int len)
 276 {
 277     CharBackend *be = s->be;
 278
 279     if (be && be->chr_read) {
 280         be->chr_read(be->opaque, buf, len);
 281     }
 282 }
 283
 284 void qemu_chr_be_write(Chardev *s, uint8_t *buf, int len)
 285 {
 286     if (qemu_chr_replay(s)) {
 287         if (replay_mode == REPLAY_MODE_PLAY) {
 288             return;
 289         }
 290         replay_chr_be_write(s, buf, len);
 291     } else {
 292         qemu_chr_be_write_impl(s, buf, len);
 293     }
 294 }
 295
 296 int qemu_chr_fe_get_msgfd(CharBackend *be)
 297 {
 298     Chardev *s = be->chr;
 299     int fd;
 300     int res = (qemu_chr_fe_get_msgfds(be, &fd, 1) == 1) ? fd : -1;
 301     if (s && qemu_chr_replay(s)) {
 302         error_report("Replay: get msgfd is not supported "
 303                      "for serial devices yet");
 304         exit(1);
 305     }
 306     return res;
 307 }
 308
 309 int qemu_chr_fe_get_msgfds(CharBackend *be, int *fds, int len)
 310 {
 311     Chardev *s = be->chr;
 312
 313     if (!s) {
 314         return -1;
 315     }
 316
 317     return CHARDEV_GET_CLASS(s)->get_msgfds ?
 318         CHARDEV_GET_CLASS(s)->get_msgfds(s, fds, len) : -1;
 319 }
 320
 321 int qemu_chr_fe_set_msgfds(CharBackend *be, int *fds, int num)
 322 {
 323     Chardev *s = be->chr;
 324
 325     if (!s) {
 326         return -1;
 327     }
 328
 329     return CHARDEV_GET_CLASS(s)->set_msgfds ?
 330         CHARDEV_GET_CLASS(s)->set_msgfds(s, fds, num) : -1;
 331 }
 332
 333 int qemu_chr_add_client(Chardev *s, int fd)
 334 {
 335     return CHARDEV_GET_CLASS(s)->chr_add_client ?
 336         CHARDEV_GET_CLASS(s)->chr_add_client(s, fd) : -1;
 337 }
 338
 339 void qemu_chr_fe_accept_input(CharBackend *be)
 340 {
 341     Chardev *s = be->chr;
 342
 343     if (!s) {
 344         return;
 345     }
 346
 347     if (CHARDEV_GET_CLASS(s)->chr_accept_input) {
 348         CHARDEV_GET_CLASS(s)->chr_accept_input(s);
 349     }
 350     qemu_notify_event();
 351 }
 352
 353 void qemu_chr_fe_printf(CharBackend *be, const char *fmt, ...)
 354 {
 355     char buf[CHR_READ_BUF_LEN];
 356     va_list ap;
 357     va_start(ap, fmt);
 358     vsnprintf(buf, sizeof(buf), fmt, ap);
 359     /* XXX this blocks entire thread. Rewrite to use
 360      * qemu_chr_fe_write and background I/O callbacks */
 361     qemu_chr_fe_write_all(be, (uint8_t *)buf, strlen(buf));
 362     va_end(ap);
 363 }
 364
 365 static void qemu_char_open(Chardev *chr, ChardevBackend *backend,
 366                            bool *be_opened, Error **errp)
 367 {
 368     ChardevClass *cc = CHARDEV_GET_CLASS(chr);
 369     /* Any ChardevCommon member would work */
 370     ChardevCommon *common = backend ? backend->u.null.data : NULL;
 371
 372     if (common && common->has_logfile) {
 373         int flags = O_WRONLY | O_CREAT;
 374         if (common->has_logappend &&
 375             common->logappend) {
 376             flags |= O_APPEND;
 377         } else {
 378             flags |= O_TRUNC;
 379         }
 380         chr->logfd = qemu_open(common->logfile, flags, 0666);
 381         if (chr->logfd < 0) {
 382             error_setg_errno(errp, errno,
 383                              "Unable to open logfile %s",
 384                              common->logfile);
 385             return;
 386         }
 387     }
 388
 389     if (cc->open) {
 390         cc->open(chr, backend, be_opened, errp);
 391     }
 392 }
 393
 394 static void char_init(Object *obj)
 395 {
 396     Chardev *chr = CHARDEV(obj);
 397
 398     chr->logfd = -1;
 399     qemu_mutex_init(&chr->chr_write_lock);
 400 }
 401
 402 static int null_chr_write(Chardev *chr, const uint8_t *buf, int len)
 403 {
 404     return len;
 405 }
 406
 407 static void char_class_init(ObjectClass *oc, void *data)
 408 {
 409     ChardevClass *cc = CHARDEV_CLASS(oc);
 410
 411     cc->chr_write = null_chr_write;
 412 }
 413
 414 static void char_finalize(Object *obj)
 415 {
 416     Chardev *chr = CHARDEV(obj);
 417
 418     if (chr->be) {
 419         chr->be->chr = NULL;
 420     }
 421     g_free(chr->filename);
 422     g_free(chr->label);
 423     if (chr->logfd != -1) {
 424         close(chr->logfd);
 425     }
 426     qemu_mutex_destroy(&chr->chr_write_lock);
 427 }
 428
 429 static const TypeInfo char_type_info = {
 430     .name = TYPE_CHARDEV,
 431     .parent = TYPE_OBJECT,
 432     .instance_size = sizeof(Chardev),
 433     .instance_init = char_init,
 434     .instance_finalize = char_finalize,
 435     .abstract = true,
 436     .class_size = sizeof(ChardevClass),
 437     .class_init = char_class_init,
 438 };
 439
 440 /**
 441  * Called after processing of default and command-line-specified
 442  * chardevs to deliver CHR_EVENT_OPENED events to any FEs attached
 443  * to a mux chardev. This is done here to ensure that
 444  * output/prompts/banners are only displayed for the FE that has
 445  * focus when initial command-line processing/machine init is
 446  * completed.
 447  *
 448  * After this point, any new FE attached to any new or existing
 449  * mux will receive CHR_EVENT_OPENED notifications for the BE
 450  * immediately.
 451  */
 452 static int open_muxes(Object *child, void *opaque)
 453 {
 454     if (CHARDEV_IS_MUX(child)) {
 455         /* send OPENED to all already-attached FEs */
 456         mux_chr_send_all_event(CHARDEV(child), CHR_EVENT_OPENED);
 457         /* mark mux as OPENED so any new FEs will immediately receive
 458          * OPENED event
 459          */
 460         qemu_chr_be_event(CHARDEV(child), CHR_EVENT_OPENED);
 461     }
 462
 463     return 0;
 464 }
 465
 466 static void muxes_realize_done(Notifier *notifier, void *unused)
 467 {
 468     muxes_realized = true;
 469     object_child_foreach(get_chardevs_root(), open_muxes, NULL);
 470 }
 471
 472 static Notifier muxes_realize_notify = {
 473     .notify = muxes_realize_done,
 474 };
 475
 476 Chardev *qemu_chr_fe_get_driver(CharBackend *be)
 477 {
 478     return be->chr;
 479 }
 480
 481 bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Error **errp)
 482 {
 483     int tag = 0;
 484
 485     if (CHARDEV_IS_MUX(s)) {
 486         MuxChardev *d = MUX_CHARDEV(s);
 487
 488         if (d->mux_cnt >= MAX_MUX) {
 489             goto unavailable;
 490         }
 491
 492         d->backends[d->mux_cnt] = b;
 493         tag = d->mux_cnt++;
 494     } else if (s->be) {
 495         goto unavailable;
 496     } else {
 497         s->be = b;
 498     }
 499
 500     b->fe_open = false;
 501     b->tag = tag;
 502     b->chr = s;
 503     return true;
 504
 505 unavailable:
 506     error_setg(errp, QERR_DEVICE_IN_USE, s->label);
 507     return false;
 508 }
 509
 510 static bool qemu_chr_is_busy(Chardev *s)
 511 {
 512     if (CHARDEV_IS_MUX(s)) {
 513         MuxChardev *d = MUX_CHARDEV(s);
 514         return d->mux_cnt >= 0;
 515     } else {
 516         return s->be != NULL;
 517     }
 518 }
 519
 520 void qemu_chr_fe_deinit(CharBackend *b)
 521 {
 522     assert(b);
 523
 524     if (b->chr) {
 525         qemu_chr_fe_set_handlers(b, NULL, NULL, NULL, NULL, NULL, true);
 526         if (b->chr->be == b) {
 527             b->chr->be = NULL;
 528         }
 529         if (CHARDEV_IS_MUX(b->chr)) {
 530             MuxChardev *d = MUX_CHARDEV(b->chr);
 531             d->backends[b->tag] = NULL;
 532         }
 533         b->chr = NULL;
 534     }
 535 }
 536
 537 void qemu_chr_fe_set_handlers(CharBackend *b,
 538                               IOCanReadHandler *fd_can_read,
 539                               IOReadHandler *fd_read,
 540                               IOEventHandler *fd_event,
 541                               void *opaque,
 542                               GMainContext *context,
 543                               bool set_open)
 544 {
 545     Chardev *s;
 546     ChardevClass *cc;
 547     int fe_open;
 548
 549     s = b->chr;
 550     if (!s) {
 551         return;
 552     }
 553
 554     cc = CHARDEV_GET_CLASS(s);
 555     if (!opaque && !fd_can_read && !fd_read && !fd_event) {
 556         fe_open = 0;
 557         remove_fd_in_watch(s, context);
 558     } else {
 559         fe_open = 1;
 560     }
 561     b->chr_can_read = fd_can_read;
 562     b->chr_read = fd_read;
 563     b->chr_event = fd_event;
 564     b->opaque = opaque;
 565     if (cc->chr_update_read_handler) {
 566         cc->chr_update_read_handler(s, context);
 567     }
 568
 569     if (set_open) {
 570         qemu_chr_fe_set_open(b, fe_open);
 571     }
 572
 573     if (fe_open) {
 574         qemu_chr_fe_take_focus(b);
 575         /* We're connecting to an already opened device, so let's make sure we
 576            also get the open event */
 577         if (s->be_open) {
 578             qemu_chr_be_event(s, CHR_EVENT_OPENED);
 579         }
 580     }
 581
 582     if (CHARDEV_IS_MUX(s)) {
 583         mux_chr_set_handlers(s, context);
 584     }
 585 }
 586
 587 void qemu_chr_fe_take_focus(CharBackend *b)
 588 {
 589     if (!b->chr) {
 590         return;
 591     }
 592
 593     if (CHARDEV_IS_MUX(b->chr)) {
 594         mux_set_focus(b->chr, b->tag);
 595     }
 596 }
 597
 598 int qemu_chr_wait_connected(Chardev *chr, Error **errp)
 599 {
 600     ChardevClass *cc = CHARDEV_GET_CLASS(chr);
 601
 602     if (cc->chr_wait_connected) {
 603         return cc->chr_wait_connected(chr, errp);
 604     }
 605
 606     return 0;
 607 }
 608
 609 int qemu_chr_fe_wait_connected(CharBackend *be, Error **errp)
 610 {
 611     if (!be->chr) {
 612         error_setg(errp, "missing associated backend");
 613         return -1;
 614     }
 615
 616     return qemu_chr_wait_connected(be->chr, errp);
 617 }
 618
 619 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
 620 {
 621     char host[65], port[33], width[8], height[8];
 622     int pos;
 623     const char *p;
 624     QemuOpts *opts;
 625     Error *local_err = NULL;
 626
 627     opts = qemu_opts_create(qemu_find_opts("chardev"), label, 1, &local_err);
 628     if (local_err) {
 629         error_report_err(local_err);
 630         return NULL;
 631     }
 632
 633     if (strstart(filename, "mon:", &p)) {
 634         filename = p;
 635         qemu_opt_set(opts, "mux", "on", &error_abort);
 636         if (strcmp(filename, "stdio") == 0) {
 637             /* Monitor is muxed to stdio: do not exit on Ctrl+C by default
 638              * but pass it to the guest.  Handle this only for compat syntax,
 639              * for -chardev syntax we have special option for this.
 640              * This is what -nographic did, redirecting+muxing serial+monitor
 641              * to stdio causing Ctrl+C to be passed to guest. */
 642             qemu_opt_set(opts, "signal", "off", &error_abort);
 643         }
 644     }
 645
 646     if (strcmp(filename, "null")    == 0 ||
 647         strcmp(filename, "pty")     == 0 ||
 648         strcmp(filename, "msmouse") == 0 ||
 649         strcmp(filename, "wctablet") == 0 ||
 650         strcmp(filename, "braille") == 0 ||
 651         strcmp(filename, "testdev") == 0 ||
 652         strcmp(filename, "stdio")   == 0) {
 653         qemu_opt_set(opts, "backend", filename, &error_abort);
 654         return opts;
 655     }
 656     if (strstart(filename, "vc", &p)) {
 657         qemu_opt_set(opts, "backend", "vc", &error_abort);
 658         if (*p == ':') {
 659             if (sscanf(p+1, "%7[0-9]x%7[0-9]", width, height) == 2) {
 660                 /* pixels */
 661                 qemu_opt_set(opts, "width", width, &error_abort);
 662                 qemu_opt_set(opts, "height", height, &error_abort);
 663             } else if (sscanf(p+1, "%7[0-9]Cx%7[0-9]C", width, height) == 2) {
 664                 /* chars */
 665                 qemu_opt_set(opts, "cols", width, &error_abort);
 666                 qemu_opt_set(opts, "rows", height, &error_abort);
 667             } else {
 668                 goto fail;
 669             }
 670         }
 671         return opts;
 672     }
 673     if (strcmp(filename, "con:") == 0) {
 674         qemu_opt_set(opts, "backend", "console", &error_abort);
 675         return opts;
 676     }
 677     if (strstart(filename, "COM", NULL)) {
 678         qemu_opt_set(opts, "backend", "serial", &error_abort);
 679         qemu_opt_set(opts, "path", filename, &error_abort);
 680         return opts;
 681     }
 682     if (strstart(filename, "file:", &p)) {
 683         qemu_opt_set(opts, "backend", "file", &error_abort);
 684         qemu_opt_set(opts, "path", p, &error_abort);
 685         return opts;
 686     }
 687     if (strstart(filename, "pipe:", &p)) {
 688         qemu_opt_set(opts, "backend", "pipe", &error_abort);
 689         qemu_opt_set(opts, "path", p, &error_abort);
 690         return opts;
 691     }
 692     if (strstart(filename, "tcp:", &p) ||
 693         strstart(filename, "telnet:", &p)) {
 694         if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) {
 695             host[0] = 0;
 696             if (sscanf(p, ":%32[^,]%n", port, &pos) < 1)
 697                 goto fail;
 698         }
 699         qemu_opt_set(opts, "backend", "socket", &error_abort);
 700         qemu_opt_set(opts, "host", host, &error_abort);
 701         qemu_opt_set(opts, "port", port, &error_abort);
 702         if (p[pos] == ',') {
 703             qemu_opts_do_parse(opts, p+pos+1, NULL, &local_err);
 704             if (local_err) {
 705                 error_report_err(local_err);
 706                 goto fail;
 707             }
 708         }
 709         if (strstart(filename, "telnet:", &p))
 710             qemu_opt_set(opts, "telnet", "on", &error_abort);
 711         return opts;
 712     }
 713     if (strstart(filename, "udp:", &p)) {
 714         qemu_opt_set(opts, "backend", "udp", &error_abort);
 715         if (sscanf(p, "%64[^:]:%32[^@,]%n", host, port, &pos) < 2) {
 716             host[0] = 0;
 717             if (sscanf(p, ":%32[^@,]%n", port, &pos) < 1) {
 718                 goto fail;
 719             }
 720         }
 721         qemu_opt_set(opts, "host", host, &error_abort);
 722         qemu_opt_set(opts, "port", port, &error_abort);
 723         if (p[pos] == '@') {
 724             p += pos + 1;
 725             if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) {
 726                 host[0] = 0;
 727                 if (sscanf(p, ":%32[^,]%n", port, &pos) < 1) {
 728                     goto fail;
 729                 }
 730             }
 731             qemu_opt_set(opts, "localaddr", host, &error_abort);
 732             qemu_opt_set(opts, "localport", port, &error_abort);
 733         }
 734         return opts;
 735     }
 736     if (strstart(filename, "unix:", &p)) {
 737         qemu_opt_set(opts, "backend", "socket", &error_abort);
 738         qemu_opts_do_parse(opts, p, "path", &local_err);
 739         if (local_err) {
 740             error_report_err(local_err);
 741             goto fail;
 742         }
 743         return opts;
 744     }
 745     if (strstart(filename, "/dev/parport", NULL) ||
 746         strstart(filename, "/dev/ppi", NULL)) {
 747         qemu_opt_set(opts, "backend", "parport", &error_abort);
 748         qemu_opt_set(opts, "path", filename, &error_abort);
 749         return opts;
 750     }
 751     if (strstart(filename, "/dev/", NULL)) {
 752         qemu_opt_set(opts, "backend", "tty", &error_abort);
 753         qemu_opt_set(opts, "path", filename, &error_abort);
 754         return opts;
 755     }
 756
 757 fail:
 758     qemu_opts_del(opts);
 759     return NULL;
 760 }
 761
 762 void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend)
 763 {
 764     const char *logfile = qemu_opt_get(opts, "logfile");
 765
 766     backend->has_logfile = logfile != NULL;
 767     backend->logfile = logfile ? g_strdup(logfile) : NULL;
 768
 769     backend->has_logappend = true;
 770     backend->logappend = qemu_opt_get_bool(opts, "logappend", false);
 771 }
 772
 773 static const ChardevClass *char_get_class(const char *driver, Error **errp)
 774 {
 775     ObjectClass *oc;
 776     const ChardevClass *cc;
 777     char *typename = g_strdup_printf("chardev-%s", driver);
 778
 779     oc = object_class_by_name(typename);
 780     g_free(typename);
 781
 782     if (!object_class_dynamic_cast(oc, TYPE_CHARDEV)) {
 783         error_setg(errp, "'%s' is not a valid char driver name", driver);
 784         return NULL;
 785     }
 786
 787     if (object_class_is_abstract(oc)) {
 788         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 789                    "abstract device type");
 790         return NULL;
 791     }
 792
 793     cc = CHARDEV_CLASS(oc);
 794     if (cc->internal) {
 795         error_setg(errp, "'%s' is not a valid char driver name", driver);
 796         return NULL;
 797     }
 798
 799     return cc;
 800 }
 801
 802 static const struct ChardevAlias {
 803     const char *typename;
 804     const char *alias;
 805 } chardev_alias_table[] = {
 806 #ifdef HAVE_CHARDEV_PARPORT
 807     { "parallel", "parport" },
 808 #endif
 809 #ifdef HAVE_CHARDEV_SERIAL
 810     { "serial", "tty" },
 811 #endif
 812 };
 813
 814 typedef struct ChadevClassFE {
 815     void (*fn)(const char *name, void *opaque);
 816     void *opaque;
 817 } ChadevClassFE;
 818
 819 static void
 820 chardev_class_foreach(ObjectClass *klass, void *opaque)
 821 {
 822     ChadevClassFE *fe = opaque;
 823
 824     assert(g_str_has_prefix(object_class_get_name(klass), "chardev-"));
 825     if (CHARDEV_CLASS(klass)->internal) {
 826         return;
 827     }
 828
 829     fe->fn(object_class_get_name(klass) + 8, fe->opaque);
 830 }
 831
 832 static void
 833 chardev_name_foreach(void (*fn)(const char *name, void *opaque), void *opaque)
 834 {
 835     ChadevClassFE fe = { .fn = fn, .opaque = opaque };
 836     int i;
 837
 838     object_class_foreach(chardev_class_foreach, TYPE_CHARDEV, false, &fe);
 839
 840     for (i = 0; i < ARRAY_SIZE(chardev_alias_table); i++) {
 841         fn(chardev_alias_table[i].alias, opaque);
 842     }
 843 }
 844
 845 static void
 846 help_string_append(const char *name, void *opaque)
 847 {
 848     GString *str = opaque;
 849
 850     g_string_append_printf(str, "\n%s", name);
 851 }
 852
 853 Chardev *qemu_chr_new_from_opts(QemuOpts *opts,
 854                                 Error **errp)
 855 {
 856     Error *local_err = NULL;
 857     const ChardevClass *cc;
 858     Chardev *chr;
 859     int i;
 860     ChardevBackend *backend = NULL;
 861     const char *name = qemu_opt_get(opts, "backend");
 862     const char *id = qemu_opts_id(opts);
 863     char *bid = NULL;
 864
 865     if (name == NULL) {
 866         error_setg(errp, "chardev: \"%s\" missing backend",
 867                    qemu_opts_id(opts));
 868         return NULL;
 869     }
 870
 871     if (is_help_option(name)) {
 872         GString *str = g_string_new("");
 873
 874         chardev_name_foreach(help_string_append, str);
 875
 876         error_report("Available chardev backend types: %s", str->str);
 877         g_string_free(str, true);
 878         exit(0);
 879     }
 880
 881     if (id == NULL) {
 882         error_setg(errp, "chardev: no id specified");
 883         return NULL;
 884     }
 885
 886     for (i = 0; i < ARRAY_SIZE(chardev_alias_table); i++) {
 887         if (g_strcmp0(chardev_alias_table[i].alias, name) == 0) {
 888             name = chardev_alias_table[i].typename;
 889             break;
 890         }
 891     }
 892
 893     cc = char_get_class(name, errp);
 894     if (cc == NULL) {
 895         return NULL;
 896     }
 897
 898     backend = g_new0(ChardevBackend, 1);
 899     backend->type = CHARDEV_BACKEND_KIND_NULL;
 900
 901     if (qemu_opt_get_bool(opts, "mux", 0)) {
 902         bid = g_strdup_printf("%s-base", id);
 903     }
 904
 905     chr = NULL;
 906     if (cc->parse) {
 907         cc->parse(opts, backend, &local_err);
 908         if (local_err) {
 909             error_propagate(errp, local_err);
 910             goto out;
 911         }
 912     } else {
 913         ChardevCommon *ccom = g_new0(ChardevCommon, 1);
 914         qemu_chr_parse_common(opts, ccom);
 915         backend->u.null.data = ccom; /* Any ChardevCommon member would work */
 916     }
 917
 918     chr = qemu_chardev_new(bid ? bid : id,
 919                            object_class_get_name(OBJECT_CLASS(cc)),
 920                            backend, errp);
 921
 922     if (chr == NULL) {
 923         goto out;
 924     }
 925
 926     if (bid) {
 927         Chardev *mux;
 928         qapi_free_ChardevBackend(backend);
 929         backend = g_new0(ChardevBackend, 1);
 930         backend->type = CHARDEV_BACKEND_KIND_MUX;
 931         backend->u.mux.data = g_new0(ChardevMux, 1);
 932         backend->u.mux.data->chardev = g_strdup(bid);
 933         mux = qemu_chardev_new(id, TYPE_CHARDEV_MUX, backend, errp);
 934         if (mux == NULL) {
 935             object_unparent(OBJECT(chr));
 936             chr = NULL;
 937             goto out;
 938         }
 939         chr = mux;
 940     }
 941
 942 out:
 943     qapi_free_ChardevBackend(backend);
 944     g_free(bid);
 945     return chr;
 946 }
 947
 948 Chardev *qemu_chr_new_noreplay(const char *label, const char *filename)
 949 {
 950     const char *p;
 951     Chardev *chr;
 952     QemuOpts *opts;
 953     Error *err = NULL;
 954
 955     if (strstart(filename, "chardev:", &p)) {
 956         return qemu_chr_find(p);
 957     }
 958
 959     opts = qemu_chr_parse_compat(label, filename);
 960     if (!opts)
 961         return NULL;
 962
 963     chr = qemu_chr_new_from_opts(opts, &err);
 964     if (err) {
 965         error_report_err(err);
 966     }
 967     if (chr && qemu_opt_get_bool(opts, "mux", 0)) {
 968         monitor_init(chr, MONITOR_USE_READLINE);
 969     }
 970     qemu_opts_del(opts);
 971     return chr;
 972 }
 973
 974 Chardev *qemu_chr_new(const char *label, const char *filename)
 975 {
 976     Chardev *chr;
 977     chr = qemu_chr_new_noreplay(label, filename);
 978     if (chr) {
 979         if (replay_mode != REPLAY_MODE_NONE) {
 980             qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_REPLAY);
 981         }
 982         if (qemu_chr_replay(chr) && CHARDEV_GET_CLASS(chr)->chr_ioctl) {
 983             error_report("Replay: ioctl is not supported "
 984                          "for serial devices yet");
 985         }
 986         replay_register_char_driver(chr);
 987     }
 988     return chr;
 989 }
 990
 991 void qemu_chr_fe_set_echo(CharBackend *be, bool echo)
 992 {
 993     Chardev *chr = be->chr;
 994
 995     if (chr && CHARDEV_GET_CLASS(chr)->chr_set_echo) {
 996         CHARDEV_GET_CLASS(chr)->chr_set_echo(chr, echo);
 997     }
 998 }
 999
1000 void qemu_chr_fe_set_open(CharBackend *be, int fe_open)
1001 {
1002     Chardev *chr = be->chr;
1003
1004     if (!chr) {
1005         return;
1006     }
1007
1008     if (be->fe_open == fe_open) {
1009         return;
1010     }
1011     be->fe_open = fe_open;
1012     if (CHARDEV_GET_CLASS(chr)->chr_set_fe_open) {
1013         CHARDEV_GET_CLASS(chr)->chr_set_fe_open(chr, fe_open);
1014     }
1015 }
1016
1017 guint qemu_chr_fe_add_watch(CharBackend *be, GIOCondition cond,
1018                             GIOFunc func, void *user_data)
1019 {
1020     Chardev *s = be->chr;
1021     GSource *src;
1022     guint tag;
1023
1024     if (!s || CHARDEV_GET_CLASS(s)->chr_add_watch == NULL) {
1025         return 0;
1026     }
1027
1028     src = CHARDEV_GET_CLASS(s)->chr_add_watch(s, cond);
1029     if (!src) {
1030         return 0;
1031     }
1032
1033     g_source_set_callback(src, (GSourceFunc)func, user_data, NULL);
1034     tag = g_source_attach(src, NULL);
1035     g_source_unref(src);
1036
1037     return tag;
1038 }
1039
1040 void qemu_chr_fe_disconnect(CharBackend *be)
1041 {
1042     Chardev *chr = be->chr;
1043
1044     if (chr && CHARDEV_GET_CLASS(chr)->chr_disconnect) {
1045         CHARDEV_GET_CLASS(chr)->chr_disconnect(chr);
1046     }
1047 }
1048
1049 static int qmp_query_chardev_foreach(Object *obj, void *data)
1050 {
1051     Chardev *chr = CHARDEV(obj);
1052     ChardevInfoList **list = data;
1053     ChardevInfoList *info = g_malloc0(sizeof(*info));
1054
1055     info->value = g_malloc0(sizeof(*info->value));
1056     info->value->label = g_strdup(chr->label);
1057     info->value->filename = g_strdup(chr->filename);
1058     info->value->frontend_open = chr->be && chr->be->fe_open;
1059
1060     info->next = *list;
1061     *list = info;
1062
1063     return 0;
1064 }
1065
1066 ChardevInfoList *qmp_query_chardev(Error **errp)
1067 {
1068     ChardevInfoList *chr_list = NULL;
1069
1070     object_child_foreach(get_chardevs_root(),
1071                          qmp_query_chardev_foreach, &chr_list);
1072
1073     return chr_list;
1074 }
1075
1076 static void
1077 qmp_prepend_backend(const char *name, void *opaque)
1078 {
1079     ChardevBackendInfoList **list = opaque;
1080     ChardevBackendInfoList *info = g_malloc0(sizeof(*info));
1081
1082     info->value = g_malloc0(sizeof(*info->value));
1083     info->value->name = g_strdup(name);
1084     info->next = *list;
1085     *list = info;
1086 }
1087
1088 ChardevBackendInfoList *qmp_query_chardev_backends(Error **errp)
1089 {
1090     ChardevBackendInfoList *backend_list = NULL;
1091
1092     chardev_name_foreach(qmp_prepend_backend, &backend_list);
1093
1094     return backend_list;
1095 }
1096
1097 Chardev *qemu_chr_find(const char *name)
1098 {
1099     Object *obj = object_resolve_path_component(get_chardevs_root(), name);
1100
1101     return obj ? CHARDEV(obj) : NULL;
1102 }
1103
1104 QemuOptsList qemu_chardev_opts = {
1105     .name = "chardev",
1106     .implied_opt_name = "backend",
1107     .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head),
1108     .desc = {
1109         {
1110             .name = "backend",
1111             .type = QEMU_OPT_STRING,
1112         },{
1113             .name = "path",
1114             .type = QEMU_OPT_STRING,
1115         },{
1116             .name = "host",
1117             .type = QEMU_OPT_STRING,
1118         },{
1119             .name = "port",
1120             .type = QEMU_OPT_STRING,
1121         },{
1122             .name = "localaddr",
1123             .type = QEMU_OPT_STRING,
1124         },{
1125             .name = "localport",
1126             .type = QEMU_OPT_STRING,
1127         },{
1128             .name = "to",
1129             .type = QEMU_OPT_NUMBER,
1130         },{
1131             .name = "ipv4",
1132             .type = QEMU_OPT_BOOL,
1133         },{
1134             .name = "ipv6",
1135             .type = QEMU_OPT_BOOL,
1136         },{
1137             .name = "wait",
1138             .type = QEMU_OPT_BOOL,
1139         },{
1140             .name = "server",
1141             .type = QEMU_OPT_BOOL,
1142         },{
1143             .name = "delay",
1144             .type = QEMU_OPT_BOOL,
1145         },{
1146             .name = "reconnect",
1147             .type = QEMU_OPT_NUMBER,
1148         },{
1149             .name = "telnet",
1150             .type = QEMU_OPT_BOOL,
1151         },{
1152             .name = "tls-creds",
1153             .type = QEMU_OPT_STRING,
1154         },{
1155             .name = "width",
1156             .type = QEMU_OPT_NUMBER,
1157         },{
1158             .name = "height",
1159             .type = QEMU_OPT_NUMBER,
1160         },{
1161             .name = "cols",
1162             .type = QEMU_OPT_NUMBER,
1163         },{
1164             .name = "rows",
1165             .type = QEMU_OPT_NUMBER,
1166         },{
1167             .name = "mux",
1168             .type = QEMU_OPT_BOOL,
1169         },{
1170             .name = "signal",
1171             .type = QEMU_OPT_BOOL,
1172         },{
1173             .name = "name",
1174             .type = QEMU_OPT_STRING,
1175         },{
1176             .name = "debug",
1177             .type = QEMU_OPT_NUMBER,
1178         },{
1179             .name = "size",
1180             .type = QEMU_OPT_SIZE,
1181         },{
1182             .name = "chardev",
1183             .type = QEMU_OPT_STRING,
1184         },{
1185             .name = "append",
1186             .type = QEMU_OPT_BOOL,
1187         },{
1188             .name = "logfile",
1189             .type = QEMU_OPT_STRING,
1190         },{
1191             .name = "logappend",
1192             .type = QEMU_OPT_BOOL,
1193         },
1194         { /* end of list */ }
1195     },
1196 };
1197
1198 bool qemu_chr_has_feature(Chardev *chr,
1199                           ChardevFeature feature)
1200 {
1201     return test_bit(feature, chr->features);
1202 }
1203
1204 void qemu_chr_set_feature(Chardev *chr,
1205                            ChardevFeature feature)
1206 {
1207     return set_bit(feature, chr->features);
1208 }
1209
1210 Chardev *qemu_chardev_new(const char *id, const char *typename,
1211                           ChardevBackend *backend,
1212                           Error **errp)
1213 {
1214     Object *obj;
1215     Chardev *chr = NULL;
1216     Error *local_err = NULL;
1217     bool be_opened = true;
1218
1219     assert(g_str_has_prefix(typename, "chardev-"));
1220
1221     obj = object_new(typename);
1222     chr = CHARDEV(obj);
1223     chr->label = g_strdup(id);
1224
1225     qemu_char_open(chr, backend, &be_opened, &local_err);
1226     if (local_err) {
1227         goto end;
1228     }
1229
1230     if (!chr->filename) {
1231         chr->filename = g_strdup(typename + 8);
1232     }
1233     if (be_opened) {
1234         qemu_chr_be_event(chr, CHR_EVENT_OPENED);
1235     }
1236
1237     if (id) {
1238         object_property_add_child(get_chardevs_root(), id, obj, &local_err);
1239         if (local_err) {
1240             goto end;
1241         }
1242         object_unref(obj);
1243     }
1244
1245 end:
1246     if (local_err) {
1247         error_propagate(errp, local_err);
1248         object_unref(obj);
1249         return NULL;
1250     }
1251
1252     return chr;
1253 }
1254
1255 ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
1256                                Error **errp)
1257 {
1258     const ChardevClass *cc;
1259     ChardevReturn *ret;
1260     Chardev *chr;
1261
1262     cc = char_get_class(ChardevBackendKind_lookup[backend->type], errp);
1263     if (!cc) {
1264         return NULL;
1265     }
1266
1267     chr = qemu_chardev_new(id, object_class_get_name(OBJECT_CLASS(cc)),
1268                            backend, errp);
1269     if (!chr) {
1270         return NULL;
1271     }
1272
1273     ret = g_new0(ChardevReturn, 1);
1274     if (CHARDEV_IS_PTY(chr)) {
1275         ret->pty = g_strdup(chr->filename + 4);
1276         ret->has_pty = true;
1277     }
1278
1279     return ret;
1280 }
1281
1282 void qmp_chardev_remove(const char *id, Error **errp)
1283 {
1284     Chardev *chr;
1285
1286     chr = qemu_chr_find(id);
1287     if (chr == NULL) {
1288         error_setg(errp, "Chardev '%s' not found", id);
1289         return;
1290     }
1291     if (qemu_chr_is_busy(chr)) {
1292         error_setg(errp, "Chardev '%s' is busy", id);
1293         return;
1294     }
1295     if (qemu_chr_replay(chr)) {
1296         error_setg(errp,
1297             "Chardev '%s' cannot be unplugged in record/replay mode", id);
1298         return;
1299     }
1300     object_unparent(OBJECT(chr));
1301 }
1302
1303 void qemu_chr_cleanup(void)
1304 {
1305     object_unparent(get_chardevs_root());
1306 }
1307
1308 static void register_types(void)
1309 {
1310     type_register_static(&char_type_info);
1311
1312     /* this must be done after machine init, since we register FEs with muxes
1313      * as part of realize functions like serial_isa_realizefn when -nographic
1314      * is specified
1315      */
1316     qemu_add_machine_init_done_notifier(&muxes_realize_notify);
1317 }
1318
1319 type_init(register_types);