chardev/char-socket.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 "sysemu/char.h"
  26 #include "io/channel-socket.h"
  27 #include "io/channel-tls.h"
  28 #include "qemu/error-report.h"
  29 #include "qapi/error.h"
  30 #include "qapi/clone-visitor.h"
  31
  32 #include "char-io.h"
  33
  34 /***********************************************************/
  35 /* TCP Net console */
  36
  37 #define TCP_MAX_FDS 16
  38
  39 typedef struct {
  40     Chardev parent;
  41     QIOChannel *ioc; /* Client I/O channel */
  42     QIOChannelSocket *sioc; /* Client master channel */
  43     QIOChannelSocket *listen_ioc;
  44     guint listen_tag;
  45     QCryptoTLSCreds *tls_creds;
  46     int connected;
  47     int max_size;
  48     int do_telnetopt;
  49     int do_nodelay;
  50     int *read_msgfds;
  51     size_t read_msgfds_num;
  52     int *write_msgfds;
  53     size_t write_msgfds_num;
  54
  55     SocketAddress *addr;
  56     bool is_listen;
  57     bool is_telnet;
  58
  59     guint reconnect_timer;
  60     int64_t reconnect_time;
  61     bool connect_err_reported;
  62 } SocketChardev;
  63
  64 #define SOCKET_CHARDEV(obj)                                     \
  65     OBJECT_CHECK(SocketChardev, (obj), TYPE_CHARDEV_SOCKET)
  66
  67 static gboolean socket_reconnect_timeout(gpointer opaque);
  68
  69 static void qemu_chr_socket_restart_timer(Chardev *chr)
  70 {
  71     SocketChardev *s = SOCKET_CHARDEV(chr);
  72     char *name;
  73
  74     assert(s->connected == 0);
  75     s->reconnect_timer = g_timeout_add_seconds(s->reconnect_time,
  76                                                socket_reconnect_timeout, chr);
  77     name = g_strdup_printf("chardev-socket-reconnect-%s", chr->label);
  78     g_source_set_name_by_id(s->reconnect_timer, name);
  79     g_free(name);
  80 }
  81
  82 static void check_report_connect_error(Chardev *chr,
  83                                        Error *err)
  84 {
  85     SocketChardev *s = SOCKET_CHARDEV(chr);
  86
  87     if (!s->connect_err_reported) {
  88         error_report("Unable to connect character device %s: %s",
  89                      chr->label, error_get_pretty(err));
  90         s->connect_err_reported = true;
  91     }
  92     qemu_chr_socket_restart_timer(chr);
  93 }
  94
  95 static gboolean tcp_chr_accept(QIOChannel *chan,
  96                                GIOCondition cond,
  97                                void *opaque);
  98
  99 static int tcp_chr_read_poll(void *opaque);
 100 static void tcp_chr_disconnect(Chardev *chr);
 101
 102 /* Called with chr_write_lock held.  */
 103 static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
 104 {
 105     SocketChardev *s = SOCKET_CHARDEV(chr);
 106
 107     if (s->connected) {
 108         int ret =  io_channel_send_full(s->ioc, buf, len,
 109                                         s->write_msgfds,
 110                                         s->write_msgfds_num);
 111
 112         /* free the written msgfds, no matter what */
 113         if (s->write_msgfds_num) {
 114             g_free(s->write_msgfds);
 115             s->write_msgfds = 0;
 116             s->write_msgfds_num = 0;
 117         }
 118
 119         if (ret < 0 && errno != EAGAIN) {
 120             if (tcp_chr_read_poll(chr) <= 0) {
 121                 tcp_chr_disconnect(chr);
 122                 return len;
 123             } /* else let the read handler finish it properly */
 124         }
 125
 126         return ret;
 127     } else {
 128         /* XXX: indicate an error ? */
 129         return len;
 130     }
 131 }
 132
 133 static int tcp_chr_read_poll(void *opaque)
 134 {
 135     Chardev *chr = CHARDEV(opaque);
 136     SocketChardev *s = SOCKET_CHARDEV(opaque);
 137     if (!s->connected) {
 138         return 0;
 139     }
 140     s->max_size = qemu_chr_be_can_write(chr);
 141     return s->max_size;
 142 }
 143
 144 #define IAC 255
 145 #define IAC_BREAK 243
 146 static void tcp_chr_process_IAC_bytes(Chardev *chr,
 147                                       SocketChardev *s,
 148                                       uint8_t *buf, int *size)
 149 {
 150     /* Handle any telnet client's basic IAC options to satisfy char by
 151      * char mode with no echo.  All IAC options will be removed from
 152      * the buf and the do_telnetopt variable will be used to track the
 153      * state of the width of the IAC information.
 154      *
 155      * IAC commands come in sets of 3 bytes with the exception of the
 156      * "IAC BREAK" command and the double IAC.
 157      */
 158
 159     int i;
 160     int j = 0;
 161
 162     for (i = 0; i < *size; i++) {
 163         if (s->do_telnetopt > 1) {
 164             if ((unsigned char)buf[i] == IAC && s->do_telnetopt == 2) {
 165                 /* Double IAC means send an IAC */
 166                 if (j != i) {
 167                     buf[j] = buf[i];
 168                 }
 169                 j++;
 170                 s->do_telnetopt = 1;
 171             } else {
 172                 if ((unsigned char)buf[i] == IAC_BREAK
 173                     && s->do_telnetopt == 2) {
 174                     /* Handle IAC break commands by sending a serial break */
 175                     qemu_chr_be_event(chr, CHR_EVENT_BREAK);
 176                     s->do_telnetopt++;
 177                 }
 178                 s->do_telnetopt++;
 179             }
 180             if (s->do_telnetopt >= 4) {
 181                 s->do_telnetopt = 1;
 182             }
 183         } else {
 184             if ((unsigned char)buf[i] == IAC) {
 185                 s->do_telnetopt = 2;
 186             } else {
 187                 if (j != i) {
 188                     buf[j] = buf[i];
 189                 }
 190                 j++;
 191             }
 192         }
 193     }
 194     *size = j;
 195 }
 196
 197 static int tcp_get_msgfds(Chardev *chr, int *fds, int num)
 198 {
 199     SocketChardev *s = SOCKET_CHARDEV(chr);
 200
 201     int to_copy = (s->read_msgfds_num < num) ? s->read_msgfds_num : num;
 202
 203     assert(num <= TCP_MAX_FDS);
 204
 205     if (to_copy) {
 206         int i;
 207
 208         memcpy(fds, s->read_msgfds, to_copy * sizeof(int));
 209
 210         /* Close unused fds */
 211         for (i = to_copy; i < s->read_msgfds_num; i++) {
 212             close(s->read_msgfds[i]);
 213         }
 214
 215         g_free(s->read_msgfds);
 216         s->read_msgfds = 0;
 217         s->read_msgfds_num = 0;
 218     }
 219
 220     return to_copy;
 221 }
 222
 223 static int tcp_set_msgfds(Chardev *chr, int *fds, int num)
 224 {
 225     SocketChardev *s = SOCKET_CHARDEV(chr);
 226
 227     /* clear old pending fd array */
 228     g_free(s->write_msgfds);
 229     s->write_msgfds = NULL;
 230     s->write_msgfds_num = 0;
 231
 232     if (!s->connected ||
 233         !qio_channel_has_feature(s->ioc,
 234                                  QIO_CHANNEL_FEATURE_FD_PASS)) {
 235         return -1;
 236     }
 237
 238     if (num) {
 239         s->write_msgfds = g_new(int, num);
 240         memcpy(s->write_msgfds, fds, num * sizeof(int));
 241     }
 242
 243     s->write_msgfds_num = num;
 244
 245     return 0;
 246 }
 247
 248 static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
 249 {
 250     SocketChardev *s = SOCKET_CHARDEV(chr);
 251     struct iovec iov = { .iov_base = buf, .iov_len = len };
 252     int ret;
 253     size_t i;
 254     int *msgfds = NULL;
 255     size_t msgfds_num = 0;
 256
 257     if (qio_channel_has_feature(s->ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
 258         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 259                                      &msgfds, &msgfds_num,
 260                                      NULL);
 261     } else {
 262         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 263                                      NULL, NULL,
 264                                      NULL);
 265     }
 266
 267     if (ret == QIO_CHANNEL_ERR_BLOCK) {
 268         errno = EAGAIN;
 269         ret = -1;
 270     } else if (ret == -1) {
 271         errno = EIO;
 272     }
 273
 274     if (msgfds_num) {
 275         /* close and clean read_msgfds */
 276         for (i = 0; i < s->read_msgfds_num; i++) {
 277             close(s->read_msgfds[i]);
 278         }
 279
 280         if (s->read_msgfds_num) {
 281             g_free(s->read_msgfds);
 282         }
 283
 284         s->read_msgfds = msgfds;
 285         s->read_msgfds_num = msgfds_num;
 286     }
 287
 288     for (i = 0; i < s->read_msgfds_num; i++) {
 289         int fd = s->read_msgfds[i];
 290         if (fd < 0) {
 291             continue;
 292         }
 293
 294         /* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
 295         qemu_set_block(fd);
 296
 297 #ifndef MSG_CMSG_CLOEXEC
 298         qemu_set_cloexec(fd);
 299 #endif
 300     }
 301
 302     return ret;
 303 }
 304
 305 static GSource *tcp_chr_add_watch(Chardev *chr, GIOCondition cond)
 306 {
 307     SocketChardev *s = SOCKET_CHARDEV(chr);
 308     return qio_channel_create_watch(s->ioc, cond);
 309 }
 310
 311 static void tcp_chr_free_connection(Chardev *chr)
 312 {
 313     SocketChardev *s = SOCKET_CHARDEV(chr);
 314     int i;
 315
 316     if (!s->connected) {
 317         return;
 318     }
 319
 320     if (s->read_msgfds_num) {
 321         for (i = 0; i < s->read_msgfds_num; i++) {
 322             close(s->read_msgfds[i]);
 323         }
 324         g_free(s->read_msgfds);
 325         s->read_msgfds = NULL;
 326         s->read_msgfds_num = 0;
 327     }
 328
 329     tcp_set_msgfds(chr, NULL, 0);
 330     remove_fd_in_watch(chr, NULL);
 331     object_unref(OBJECT(s->sioc));
 332     s->sioc = NULL;
 333     object_unref(OBJECT(s->ioc));
 334     s->ioc = NULL;
 335     g_free(chr->filename);
 336     chr->filename = NULL;
 337     s->connected = 0;
 338 }
 339
 340 static char *SocketAddress_to_str(const char *prefix, SocketAddress *addr,
 341                                   bool is_listen, bool is_telnet)
 342 {
 343     switch (addr->type) {
 344     case SOCKET_ADDRESS_KIND_INET:
 345         return g_strdup_printf("%s%s:%s:%s%s", prefix,
 346                                is_telnet ? "telnet" : "tcp",
 347                                addr->u.inet.data->host,
 348                                addr->u.inet.data->port,
 349                                is_listen ? ",server" : "");
 350         break;
 351     case SOCKET_ADDRESS_KIND_UNIX:
 352         return g_strdup_printf("%sunix:%s%s", prefix,
 353                                addr->u.q_unix.data->path,
 354                                is_listen ? ",server" : "");
 355         break;
 356     case SOCKET_ADDRESS_KIND_FD:
 357         return g_strdup_printf("%sfd:%s%s", prefix, addr->u.fd.data->str,
 358                                is_listen ? ",server" : "");
 359         break;
 360     case SOCKET_ADDRESS_KIND_VSOCK:
 361         return g_strdup_printf("%svsock:%s:%s", prefix,
 362                                addr->u.vsock.data->cid,
 363                                addr->u.vsock.data->port);
 364     default:
 365         abort();
 366     }
 367 }
 368
 369 static void tcp_chr_disconnect(Chardev *chr)
 370 {
 371     SocketChardev *s = SOCKET_CHARDEV(chr);
 372
 373     if (!s->connected) {
 374         return;
 375     }
 376
 377     tcp_chr_free_connection(chr);
 378
 379     if (s->listen_ioc) {
 380         s->listen_tag = qio_channel_add_watch(
 381             QIO_CHANNEL(s->listen_ioc), G_IO_IN, tcp_chr_accept, chr, NULL);
 382     }
 383     chr->filename = SocketAddress_to_str("disconnected:", s->addr,
 384                                          s->is_listen, s->is_telnet);
 385     qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 386     if (s->reconnect_time) {
 387         qemu_chr_socket_restart_timer(chr);
 388     }
 389 }
 390
 391 static gboolean tcp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
 392 {
 393     Chardev *chr = CHARDEV(opaque);
 394     SocketChardev *s = SOCKET_CHARDEV(opaque);
 395     uint8_t buf[CHR_READ_BUF_LEN];
 396     int len, size;
 397
 398     if (!s->connected || s->max_size <= 0) {
 399         return TRUE;
 400     }
 401     len = sizeof(buf);
 402     if (len > s->max_size) {
 403         len = s->max_size;
 404     }
 405     size = tcp_chr_recv(chr, (void *)buf, len);
 406     if (size == 0 || size == -1) {
 407         /* connection closed */
 408         tcp_chr_disconnect(chr);
 409     } else if (size > 0) {
 410         if (s->do_telnetopt) {
 411             tcp_chr_process_IAC_bytes(chr, s, buf, &size);
 412         }
 413         if (size > 0) {
 414             qemu_chr_be_write(chr, buf, size);
 415         }
 416     }
 417
 418     return TRUE;
 419 }
 420
 421 static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len)
 422 {
 423     SocketChardev *s = SOCKET_CHARDEV(chr);
 424     int size;
 425
 426     if (!s->connected) {
 427         return 0;
 428     }
 429
 430     size = tcp_chr_recv(chr, (void *) buf, len);
 431     if (size == 0) {
 432         /* connection closed */
 433         tcp_chr_disconnect(chr);
 434     }
 435
 436     return size;
 437 }
 438
 439 static char *sockaddr_to_str(struct sockaddr_storage *ss, socklen_t ss_len,
 440                              struct sockaddr_storage *ps, socklen_t ps_len,
 441                              bool is_listen, bool is_telnet)
 442 {
 443     char shost[NI_MAXHOST], sserv[NI_MAXSERV];
 444     char phost[NI_MAXHOST], pserv[NI_MAXSERV];
 445     const char *left = "", *right = "";
 446
 447     switch (ss->ss_family) {
 448 #ifndef _WIN32
 449     case AF_UNIX:
 450         return g_strdup_printf("unix:%s%s",
 451                                ((struct sockaddr_un *)(ss))->sun_path,
 452                                is_listen ? ",server" : "");
 453 #endif
 454     case AF_INET6:
 455         left  = "[";
 456         right = "]";
 457         /* fall through */
 458     case AF_INET:
 459         getnameinfo((struct sockaddr *) ss, ss_len, shost, sizeof(shost),
 460                     sserv, sizeof(sserv), NI_NUMERICHOST | NI_NUMERICSERV);
 461         getnameinfo((struct sockaddr *) ps, ps_len, phost, sizeof(phost),
 462                     pserv, sizeof(pserv), NI_NUMERICHOST | NI_NUMERICSERV);
 463         return g_strdup_printf("%s:%s%s%s:%s%s <-> %s%s%s:%s",
 464                                is_telnet ? "telnet" : "tcp",
 465                                left, shost, right, sserv,
 466                                is_listen ? ",server" : "",
 467                                left, phost, right, pserv);
 468
 469     default:
 470         return g_strdup_printf("unknown");
 471     }
 472 }
 473
 474 static void tcp_chr_connect(void *opaque)
 475 {
 476     Chardev *chr = CHARDEV(opaque);
 477     SocketChardev *s = SOCKET_CHARDEV(opaque);
 478
 479     g_free(chr->filename);
 480     chr->filename = sockaddr_to_str(
 481         &s->sioc->localAddr, s->sioc->localAddrLen,
 482         &s->sioc->remoteAddr, s->sioc->remoteAddrLen,
 483         s->is_listen, s->is_telnet);
 484
 485     s->connected = 1;
 486     if (s->ioc) {
 487         chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
 488                                            tcp_chr_read_poll,
 489                                            tcp_chr_read,
 490                                            chr, NULL);
 491     }
 492     qemu_chr_be_generic_open(chr);
 493 }
 494
 495 static void tcp_chr_update_read_handler(Chardev *chr,
 496                                         GMainContext *context)
 497 {
 498     SocketChardev *s = SOCKET_CHARDEV(chr);
 499
 500     if (!s->connected) {
 501         return;
 502     }
 503
 504     remove_fd_in_watch(chr, NULL);
 505     if (s->ioc) {
 506         chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
 507                                            tcp_chr_read_poll,
 508                                            tcp_chr_read, chr,
 509                                            context);
 510     }
 511 }
 512
 513 typedef struct {
 514     Chardev *chr;
 515     char buf[12];
 516     size_t buflen;
 517 } TCPChardevTelnetInit;
 518
 519 static gboolean tcp_chr_telnet_init_io(QIOChannel *ioc,
 520                                        GIOCondition cond G_GNUC_UNUSED,
 521                                        gpointer user_data)
 522 {
 523     TCPChardevTelnetInit *init = user_data;
 524     ssize_t ret;
 525
 526     ret = qio_channel_write(ioc, init->buf, init->buflen, NULL);
 527     if (ret < 0) {
 528         if (ret == QIO_CHANNEL_ERR_BLOCK) {
 529             ret = 0;
 530         } else {
 531             tcp_chr_disconnect(init->chr);
 532             return FALSE;
 533         }
 534     }
 535     init->buflen -= ret;
 536
 537     if (init->buflen == 0) {
 538         tcp_chr_connect(init->chr);
 539         return FALSE;
 540     }
 541
 542     memmove(init->buf, init->buf + ret, init->buflen);
 543
 544     return TRUE;
 545 }
 546
 547 static void tcp_chr_telnet_init(Chardev *chr)
 548 {
 549     SocketChardev *s = SOCKET_CHARDEV(chr);
 550     TCPChardevTelnetInit *init = g_new0(TCPChardevTelnetInit, 1);
 551     size_t n = 0;
 552
 553     init->chr = chr;
 554     init->buflen = 12;
 555
 556 #define IACSET(x, a, b, c)                      \
 557     do {                                        \
 558         x[n++] = a;                             \
 559         x[n++] = b;                             \
 560         x[n++] = c;                             \
 561     } while (0)
 562
 563     /* Prep the telnet negotion to put telnet in binary,
 564      * no echo, single char mode */
 565     IACSET(init->buf, 0xff, 0xfb, 0x01);  /* IAC WILL ECHO */
 566     IACSET(init->buf, 0xff, 0xfb, 0x03);  /* IAC WILL Suppress go ahead */
 567     IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL Binary */
 568     IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO Binary */
 569
 570 #undef IACSET
 571
 572     qio_channel_add_watch(
 573         s->ioc, G_IO_OUT,
 574         tcp_chr_telnet_init_io,
 575         init, NULL);
 576 }
 577
 578
 579 static void tcp_chr_tls_handshake(QIOTask *task,
 580                                   gpointer user_data)
 581 {
 582     Chardev *chr = user_data;
 583     SocketChardev *s = user_data;
 584
 585     if (qio_task_propagate_error(task, NULL)) {
 586         tcp_chr_disconnect(chr);
 587     } else {
 588         if (s->do_telnetopt) {
 589             tcp_chr_telnet_init(chr);
 590         } else {
 591             tcp_chr_connect(chr);
 592         }
 593     }
 594 }
 595
 596
 597 static void tcp_chr_tls_init(Chardev *chr)
 598 {
 599     SocketChardev *s = SOCKET_CHARDEV(chr);
 600     QIOChannelTLS *tioc;
 601     Error *err = NULL;
 602     gchar *name;
 603
 604     if (s->is_listen) {
 605         tioc = qio_channel_tls_new_server(
 606             s->ioc, s->tls_creds,
 607             NULL, /* XXX Use an ACL */
 608             &err);
 609     } else {
 610         tioc = qio_channel_tls_new_client(
 611             s->ioc, s->tls_creds,
 612             s->addr->u.inet.data->host,
 613             &err);
 614     }
 615     if (tioc == NULL) {
 616         error_free(err);
 617         tcp_chr_disconnect(chr);
 618         return;
 619     }
 620     name = g_strdup_printf("chardev-tls-%s-%s",
 621                            s->is_listen ? "server" : "client",
 622                            chr->label);
 623     qio_channel_set_name(QIO_CHANNEL(tioc), name);
 624     g_free(name);
 625     object_unref(OBJECT(s->ioc));
 626     s->ioc = QIO_CHANNEL(tioc);
 627
 628     qio_channel_tls_handshake(tioc,
 629                               tcp_chr_tls_handshake,
 630                               chr,
 631                               NULL);
 632 }
 633
 634
 635 static void tcp_chr_set_client_ioc_name(Chardev *chr,
 636                                         QIOChannelSocket *sioc)
 637 {
 638     SocketChardev *s = SOCKET_CHARDEV(chr);
 639     char *name;
 640     name = g_strdup_printf("chardev-tcp-%s-%s",
 641                            s->is_listen ? "server" : "client",
 642                            chr->label);
 643     qio_channel_set_name(QIO_CHANNEL(sioc), name);
 644     g_free(name);
 645
 646 }
 647
 648 static int tcp_chr_new_client(Chardev *chr, QIOChannelSocket *sioc)
 649 {
 650     SocketChardev *s = SOCKET_CHARDEV(chr);
 651
 652     if (s->ioc != NULL) {
 653         return -1;
 654     }
 655
 656     s->ioc = QIO_CHANNEL(sioc);
 657     object_ref(OBJECT(sioc));
 658     s->sioc = sioc;
 659     object_ref(OBJECT(sioc));
 660
 661     qio_channel_set_blocking(s->ioc, false, NULL);
 662
 663     if (s->do_nodelay) {
 664         qio_channel_set_delay(s->ioc, false);
 665     }
 666     if (s->listen_tag) {
 667         g_source_remove(s->listen_tag);
 668         s->listen_tag = 0;
 669     }
 670
 671     if (s->tls_creds) {
 672         tcp_chr_tls_init(chr);
 673     } else {
 674         if (s->do_telnetopt) {
 675             tcp_chr_telnet_init(chr);
 676         } else {
 677             tcp_chr_connect(chr);
 678         }
 679     }
 680
 681     return 0;
 682 }
 683
 684
 685 static int tcp_chr_add_client(Chardev *chr, int fd)
 686 {
 687     int ret;
 688     QIOChannelSocket *sioc;
 689
 690     sioc = qio_channel_socket_new_fd(fd, NULL);
 691     if (!sioc) {
 692         return -1;
 693     }
 694     tcp_chr_set_client_ioc_name(chr, sioc);
 695     ret = tcp_chr_new_client(chr, sioc);
 696     object_unref(OBJECT(sioc));
 697     return ret;
 698 }
 699
 700 static gboolean tcp_chr_accept(QIOChannel *channel,
 701                                GIOCondition cond,
 702                                void *opaque)
 703 {
 704     Chardev *chr = CHARDEV(opaque);
 705     QIOChannelSocket *sioc;
 706
 707     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(channel),
 708                                      NULL);
 709     if (!sioc) {
 710         return TRUE;
 711     }
 712
 713     tcp_chr_new_client(chr, sioc);
 714
 715     object_unref(OBJECT(sioc));
 716
 717     return TRUE;
 718 }
 719
 720 static int tcp_chr_wait_connected(Chardev *chr, Error **errp)
 721 {
 722     SocketChardev *s = SOCKET_CHARDEV(chr);
 723     QIOChannelSocket *sioc;
 724
 725     /* It can't wait on s->connected, since it is set asynchronously
 726      * in TLS and telnet cases, only wait for an accepted socket */
 727     while (!s->ioc) {
 728         if (s->is_listen) {
 729             error_report("QEMU waiting for connection on: %s",
 730                          chr->filename);
 731             qio_channel_set_blocking(QIO_CHANNEL(s->listen_ioc), true, NULL);
 732             tcp_chr_accept(QIO_CHANNEL(s->listen_ioc), G_IO_IN, chr);
 733             qio_channel_set_blocking(QIO_CHANNEL(s->listen_ioc), false, NULL);
 734         } else {
 735             sioc = qio_channel_socket_new();
 736             tcp_chr_set_client_ioc_name(chr, sioc);
 737             if (qio_channel_socket_connect_sync(sioc, s->addr, errp) < 0) {
 738                 object_unref(OBJECT(sioc));
 739                 return -1;
 740             }
 741             tcp_chr_new_client(chr, sioc);
 742             object_unref(OBJECT(sioc));
 743         }
 744     }
 745
 746     return 0;
 747 }
 748
 749 static void char_socket_finalize(Object *obj)
 750 {
 751     Chardev *chr = CHARDEV(obj);
 752     SocketChardev *s = SOCKET_CHARDEV(obj);
 753
 754     tcp_chr_free_connection(chr);
 755
 756     if (s->reconnect_timer) {
 757         g_source_remove(s->reconnect_timer);
 758         s->reconnect_timer = 0;
 759     }
 760     qapi_free_SocketAddress(s->addr);
 761     if (s->listen_tag) {
 762         g_source_remove(s->listen_tag);
 763         s->listen_tag = 0;
 764     }
 765     if (s->listen_ioc) {
 766         object_unref(OBJECT(s->listen_ioc));
 767     }
 768     if (s->tls_creds) {
 769         object_unref(OBJECT(s->tls_creds));
 770     }
 771
 772     qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 773 }
 774
 775 static void qemu_chr_socket_connected(QIOTask *task, void *opaque)
 776 {
 777     QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
 778     Chardev *chr = CHARDEV(opaque);
 779     SocketChardev *s = SOCKET_CHARDEV(chr);
 780     Error *err = NULL;
 781
 782     if (qio_task_propagate_error(task, &err)) {
 783         check_report_connect_error(chr, err);
 784         error_free(err);
 785         goto cleanup;
 786     }
 787
 788     s->connect_err_reported = false;
 789     tcp_chr_new_client(chr, sioc);
 790
 791 cleanup:
 792     object_unref(OBJECT(sioc));
 793 }
 794
 795 static gboolean socket_reconnect_timeout(gpointer opaque)
 796 {
 797     Chardev *chr = CHARDEV(opaque);
 798     SocketChardev *s = SOCKET_CHARDEV(opaque);
 799     QIOChannelSocket *sioc;
 800
 801     s->reconnect_timer = 0;
 802
 803     if (chr->be_open) {
 804         return false;
 805     }
 806
 807     sioc = qio_channel_socket_new();
 808     tcp_chr_set_client_ioc_name(chr, sioc);
 809     qio_channel_socket_connect_async(sioc, s->addr,
 810                                      qemu_chr_socket_connected,
 811                                      chr, NULL);
 812
 813     return false;
 814 }
 815
 816 static void qmp_chardev_open_socket(Chardev *chr,
 817                                     ChardevBackend *backend,
 818                                     bool *be_opened,
 819                                     Error **errp)
 820 {
 821     SocketChardev *s = SOCKET_CHARDEV(chr);
 822     ChardevSocket *sock = backend->u.socket.data;
 823     SocketAddress *addr = sock->addr;
 824     bool do_nodelay     = sock->has_nodelay ? sock->nodelay : false;
 825     bool is_listen      = sock->has_server  ? sock->server  : true;
 826     bool is_telnet      = sock->has_telnet  ? sock->telnet  : false;
 827     bool is_waitconnect = sock->has_wait    ? sock->wait    : false;
 828     int64_t reconnect   = sock->has_reconnect ? sock->reconnect : 0;
 829     QIOChannelSocket *sioc = NULL;
 830
 831     s->is_listen = is_listen;
 832     s->is_telnet = is_telnet;
 833     s->do_nodelay = do_nodelay;
 834     if (sock->tls_creds) {
 835         Object *creds;
 836         creds = object_resolve_path_component(
 837             object_get_objects_root(), sock->tls_creds);
 838         if (!creds) {
 839             error_setg(errp, "No TLS credentials with id '%s'",
 840                        sock->tls_creds);
 841             goto error;
 842         }
 843         s->tls_creds = (QCryptoTLSCreds *)
 844             object_dynamic_cast(creds,
 845                                 TYPE_QCRYPTO_TLS_CREDS);
 846         if (!s->tls_creds) {
 847             error_setg(errp, "Object with id '%s' is not TLS credentials",
 848                        sock->tls_creds);
 849             goto error;
 850         }
 851         object_ref(OBJECT(s->tls_creds));
 852         if (is_listen) {
 853             if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
 854                 error_setg(errp, "%s",
 855                            "Expected TLS credentials for server endpoint");
 856                 goto error;
 857             }
 858         } else {
 859             if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
 860                 error_setg(errp, "%s",
 861                            "Expected TLS credentials for client endpoint");
 862                 goto error;
 863             }
 864         }
 865     }
 866
 867     s->addr = QAPI_CLONE(SocketAddress, sock->addr);
 868
 869     qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE);
 870     /* TODO SOCKET_ADDRESS_FD where fd has AF_UNIX */
 871     if (addr->type == SOCKET_ADDRESS_KIND_UNIX) {
 872         qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_FD_PASS);
 873     }
 874
 875     /* be isn't opened until we get a connection */
 876     *be_opened = false;
 877
 878     chr->filename = SocketAddress_to_str("disconnected:",
 879                                          addr, is_listen, is_telnet);
 880
 881     if (is_listen) {
 882         if (is_telnet) {
 883             s->do_telnetopt = 1;
 884         }
 885     } else if (reconnect > 0) {
 886         s->reconnect_time = reconnect;
 887     }
 888
 889     if (s->reconnect_time) {
 890         sioc = qio_channel_socket_new();
 891         tcp_chr_set_client_ioc_name(chr, sioc);
 892         qio_channel_socket_connect_async(sioc, s->addr,
 893                                          qemu_chr_socket_connected,
 894                                          chr, NULL);
 895     } else {
 896         if (s->is_listen) {
 897             char *name;
 898             sioc = qio_channel_socket_new();
 899
 900             name = g_strdup_printf("chardev-tcp-listener-%s", chr->label);
 901             qio_channel_set_name(QIO_CHANNEL(sioc), name);
 902             g_free(name);
 903
 904             if (qio_channel_socket_listen_sync(sioc, s->addr, errp) < 0) {
 905                 goto error;
 906             }
 907             s->listen_ioc = sioc;
 908             if (is_waitconnect &&
 909                 qemu_chr_wait_connected(chr, errp) < 0) {
 910                 return;
 911             }
 912             if (!s->ioc) {
 913                 s->listen_tag = qio_channel_add_watch(
 914                     QIO_CHANNEL(s->listen_ioc), G_IO_IN,
 915                     tcp_chr_accept, chr, NULL);
 916             }
 917         } else if (qemu_chr_wait_connected(chr, errp) < 0) {
 918             goto error;
 919         }
 920     }
 921
 922     return;
 923
 924 error:
 925     if (sioc) {
 926         object_unref(OBJECT(sioc));
 927     }
 928 }
 929
 930 static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
 931                                   Error **errp)
 932 {
 933     bool is_listen      = qemu_opt_get_bool(opts, "server", false);
 934     bool is_waitconnect = is_listen && qemu_opt_get_bool(opts, "wait", true);
 935     bool is_telnet      = qemu_opt_get_bool(opts, "telnet", false);
 936     bool do_nodelay     = !qemu_opt_get_bool(opts, "delay", true);
 937     int64_t reconnect   = qemu_opt_get_number(opts, "reconnect", 0);
 938     const char *path = qemu_opt_get(opts, "path");
 939     const char *host = qemu_opt_get(opts, "host");
 940     const char *port = qemu_opt_get(opts, "port");
 941     const char *tls_creds = qemu_opt_get(opts, "tls-creds");
 942     SocketAddress *addr;
 943     ChardevSocket *sock;
 944
 945     backend->type = CHARDEV_BACKEND_KIND_SOCKET;
 946     if (!path) {
 947         if (!host) {
 948             error_setg(errp, "chardev: socket: no host given");
 949             return;
 950         }
 951         if (!port) {
 952             error_setg(errp, "chardev: socket: no port given");
 953             return;
 954         }
 955     } else {
 956         if (tls_creds) {
 957             error_setg(errp, "TLS can only be used over TCP socket");
 958             return;
 959         }
 960     }
 961
 962     sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
 963     qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));
 964
 965     sock->has_nodelay = true;
 966     sock->nodelay = do_nodelay;
 967     sock->has_server = true;
 968     sock->server = is_listen;
 969     sock->has_telnet = true;
 970     sock->telnet = is_telnet;
 971     sock->has_wait = true;
 972     sock->wait = is_waitconnect;
 973     sock->has_reconnect = true;
 974     sock->reconnect = reconnect;
 975     sock->tls_creds = g_strdup(tls_creds);
 976
 977     addr = g_new0(SocketAddress, 1);
 978     if (path) {
 979         UnixSocketAddress *q_unix;
 980         addr->type = SOCKET_ADDRESS_KIND_UNIX;
 981         q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
 982         q_unix->path = g_strdup(path);
 983     } else {
 984         addr->type = SOCKET_ADDRESS_KIND_INET;
 985         addr->u.inet.data = g_new(InetSocketAddress, 1);
 986         *addr->u.inet.data = (InetSocketAddress) {
 987             .host = g_strdup(host),
 988             .port = g_strdup(port),
 989             .has_to = qemu_opt_get(opts, "to"),
 990             .to = qemu_opt_get_number(opts, "to", 0),
 991             .has_ipv4 = qemu_opt_get(opts, "ipv4"),
 992             .ipv4 = qemu_opt_get_bool(opts, "ipv4", 0),
 993             .has_ipv6 = qemu_opt_get(opts, "ipv6"),
 994             .ipv6 = qemu_opt_get_bool(opts, "ipv6", 0),
 995         };
 996     }
 997     sock->addr = addr;
 998 }
 999
1000 static void char_socket_class_init(ObjectClass *oc, void *data)
1001 {
1002     ChardevClass *cc = CHARDEV_CLASS(oc);
1003
1004     cc->parse = qemu_chr_parse_socket;
1005     cc->open = qmp_chardev_open_socket;
1006     cc->chr_wait_connected = tcp_chr_wait_connected;
1007     cc->chr_write = tcp_chr_write;
1008     cc->chr_sync_read = tcp_chr_sync_read;
1009     cc->chr_disconnect = tcp_chr_disconnect;
1010     cc->get_msgfds = tcp_get_msgfds;
1011     cc->set_msgfds = tcp_set_msgfds;
1012     cc->chr_add_client = tcp_chr_add_client;
1013     cc->chr_add_watch = tcp_chr_add_watch;
1014     cc->chr_update_read_handler = tcp_chr_update_read_handler;
1015 }
1016
1017 static const TypeInfo char_socket_type_info = {
1018     .name = TYPE_CHARDEV_SOCKET,
1019     .parent = TYPE_CHARDEV,
1020     .instance_size = sizeof(SocketChardev),
1021     .instance_finalize = char_socket_finalize,
1022     .class_init = char_socket_class_init,
1023 };
1024
1025 static void register_types(void)
1026 {
1027     type_register_static(&char_socket_type_info);
1028 }
1029
1030 type_init(register_types);