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
  25 #include "qemu/osdep.h"
  26 #include "chardev/char.h"
  27 #include "io/channel-socket.h"
  28 #include "io/channel-tls.h"
  29 #include "io/channel-websock.h"
  30 #include "io/net-listener.h"
  31 #include "qemu/error-report.h"
  32 #include "qemu/module.h"
  33 #include "qemu/option.h"
  34 #include "qapi/error.h"
  35 #include "qapi/clone-visitor.h"
  36 #include "qapi/qapi-visit-sockets.h"
  37
  38 #include "chardev/char-io.h"
  39
  40 /***********************************************************/
  41 /* TCP Net console */
  42
  43 #define TCP_MAX_FDS 16
  44
  45 typedef struct {
  46     char buf[21];
  47     size_t buflen;
  48 } TCPChardevTelnetInit;
  49
  50 typedef enum {
  51     TCP_CHARDEV_STATE_DISCONNECTED,
  52     TCP_CHARDEV_STATE_CONNECTING,
  53     TCP_CHARDEV_STATE_CONNECTED,
  54 } TCPChardevState;
  55
  56 typedef struct {
  57     Chardev parent;
  58     QIOChannel *ioc; /* Client I/O channel */
  59     QIOChannelSocket *sioc; /* Client master channel */
  60     QIONetListener *listener;
  61     GSource *hup_source;
  62     QCryptoTLSCreds *tls_creds;
  63     char *tls_authz;
  64     TCPChardevState state;
  65     int max_size;
  66     int do_telnetopt;
  67     int do_nodelay;
  68     int *read_msgfds;
  69     size_t read_msgfds_num;
  70     int *write_msgfds;
  71     size_t write_msgfds_num;
  72
  73     SocketAddress *addr;
  74     bool is_listen;
  75     bool is_telnet;
  76     bool is_tn3270;
  77     GSource *telnet_source;
  78     TCPChardevTelnetInit *telnet_init;
  79
  80     bool is_websock;
  81
  82     GSource *reconnect_timer;
  83     int64_t reconnect_time;
  84     bool connect_err_reported;
  85
  86     QIOTask *connect_task;
  87 } SocketChardev;
  88
  89 #define SOCKET_CHARDEV(obj)                                     \
  90     OBJECT_CHECK(SocketChardev, (obj), TYPE_CHARDEV_SOCKET)
  91
  92 static gboolean socket_reconnect_timeout(gpointer opaque);
  93 static void tcp_chr_telnet_init(Chardev *chr);
  94
  95 static void tcp_chr_change_state(SocketChardev *s, TCPChardevState state)
  96 {
  97     switch (state) {
  98     case TCP_CHARDEV_STATE_DISCONNECTED:
  99         break;
 100     case TCP_CHARDEV_STATE_CONNECTING:
 101         assert(s->state == TCP_CHARDEV_STATE_DISCONNECTED);
 102         break;
 103     case TCP_CHARDEV_STATE_CONNECTED:
 104         assert(s->state == TCP_CHARDEV_STATE_CONNECTING);
 105         break;
 106     }
 107     s->state = state;
 108 }
 109
 110 static void tcp_chr_reconn_timer_cancel(SocketChardev *s)
 111 {
 112     if (s->reconnect_timer) {
 113         g_source_destroy(s->reconnect_timer);
 114         g_source_unref(s->reconnect_timer);
 115         s->reconnect_timer = NULL;
 116     }
 117 }
 118
 119 static void qemu_chr_socket_restart_timer(Chardev *chr)
 120 {
 121     SocketChardev *s = SOCKET_CHARDEV(chr);
 122     char *name;
 123
 124     assert(s->state == TCP_CHARDEV_STATE_DISCONNECTED);
 125     assert(!s->reconnect_timer);
 126     name = g_strdup_printf("chardev-socket-reconnect-%s", chr->label);
 127     s->reconnect_timer = qemu_chr_timeout_add_ms(chr,
 128                                                  s->reconnect_time * 1000,
 129                                                  socket_reconnect_timeout,
 130                                                  chr);
 131     g_source_set_name(s->reconnect_timer, name);
 132     g_free(name);
 133 }
 134
 135 static void check_report_connect_error(Chardev *chr,
 136                                        Error *err)
 137 {
 138     SocketChardev *s = SOCKET_CHARDEV(chr);
 139
 140     if (!s->connect_err_reported) {
 141         error_reportf_err(err,
 142                           "Unable to connect character device %s: ",
 143                           chr->label);
 144         s->connect_err_reported = true;
 145     }
 146     qemu_chr_socket_restart_timer(chr);
 147 }
 148
 149 static void tcp_chr_accept(QIONetListener *listener,
 150                            QIOChannelSocket *cioc,
 151                            void *opaque);
 152
 153 static int tcp_chr_read_poll(void *opaque);
 154 static void tcp_chr_disconnect_locked(Chardev *chr);
 155
 156 /* Called with chr_write_lock held.  */
 157 static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
 158 {
 159     SocketChardev *s = SOCKET_CHARDEV(chr);
 160
 161     if (s->state == TCP_CHARDEV_STATE_CONNECTED) {
 162         int ret =  io_channel_send_full(s->ioc, buf, len,
 163                                         s->write_msgfds,
 164                                         s->write_msgfds_num);
 165
 166         /* free the written msgfds in any cases
 167          * other than ret < 0 && errno == EAGAIN
 168          */
 169         if (!(ret < 0 && EAGAIN == errno)
 170             && s->write_msgfds_num) {
 171             g_free(s->write_msgfds);
 172             s->write_msgfds = 0;
 173             s->write_msgfds_num = 0;
 174         }
 175
 176         if (ret < 0 && errno != EAGAIN) {
 177             if (tcp_chr_read_poll(chr) <= 0) {
 178                 /* Perform disconnect and return error. */
 179                 tcp_chr_disconnect_locked(chr);
 180             } /* else let the read handler finish it properly */
 181         }
 182
 183         return ret;
 184     } else {
 185         /* Indicate an error. */
 186         errno = EIO;
 187         return -1;
 188     }
 189 }
 190
 191 static int tcp_chr_read_poll(void *opaque)
 192 {
 193     Chardev *chr = CHARDEV(opaque);
 194     SocketChardev *s = SOCKET_CHARDEV(opaque);
 195     if (s->state != TCP_CHARDEV_STATE_CONNECTED) {
 196         return 0;
 197     }
 198     s->max_size = qemu_chr_be_can_write(chr);
 199     return s->max_size;
 200 }
 201
 202 static void tcp_chr_process_IAC_bytes(Chardev *chr,
 203                                       SocketChardev *s,
 204                                       uint8_t *buf, int *size)
 205 {
 206     /* Handle any telnet or tn3270 client's basic IAC options.
 207      * For telnet options, it satisfies char by char mode with no echo.
 208      * For tn3270 options, it satisfies binary mode with EOR.
 209      * All IAC options will be removed from the buf and the do_opt
 210      * pointer will be used to track the state of the width of the
 211      * IAC information.
 212      *
 213      * RFC854: "All TELNET commands consist of at least a two byte sequence.
 214      * The commands dealing with option negotiation are three byte sequences,
 215      * the third byte being the code for the option referenced."
 216      * "IAC BREAK", "IAC IP", "IAC NOP" and the double IAC are two bytes.
 217      * "IAC SB", "IAC SE" and "IAC EOR" are saved to split up data boundary
 218      * for tn3270.
 219      * NOP, Break and Interrupt Process(IP) might be encountered during a TN3270
 220      * session, and NOP and IP need to be done later.
 221      */
 222
 223     int i;
 224     int j = 0;
 225
 226     for (i = 0; i < *size; i++) {
 227         if (s->do_telnetopt > 1) {
 228             if ((unsigned char)buf[i] == IAC && s->do_telnetopt == 2) {
 229                 /* Double IAC means send an IAC */
 230                 if (j != i) {
 231                     buf[j] = buf[i];
 232                 }
 233                 j++;
 234                 s->do_telnetopt = 1;
 235             } else {
 236                 if ((unsigned char)buf[i] == IAC_BREAK
 237                     && s->do_telnetopt == 2) {
 238                     /* Handle IAC break commands by sending a serial break */
 239                     qemu_chr_be_event(chr, CHR_EVENT_BREAK);
 240                     s->do_telnetopt++;
 241                 } else if (s->is_tn3270 && ((unsigned char)buf[i] == IAC_EOR
 242                            || (unsigned char)buf[i] == IAC_SB
 243                            || (unsigned char)buf[i] == IAC_SE)
 244                            && s->do_telnetopt == 2) {
 245                     buf[j++] = IAC;
 246                     buf[j++] = buf[i];
 247                     s->do_telnetopt++;
 248                 } else if (s->is_tn3270 && ((unsigned char)buf[i] == IAC_IP
 249                            || (unsigned char)buf[i] == IAC_NOP)
 250                            && s->do_telnetopt == 2) {
 251                     /* TODO: IP and NOP need to be implemented later. */
 252                     s->do_telnetopt++;
 253                 }
 254                 s->do_telnetopt++;
 255             }
 256             if (s->do_telnetopt >= 4) {
 257                 s->do_telnetopt = 1;
 258             }
 259         } else {
 260             if ((unsigned char)buf[i] == IAC) {
 261                 s->do_telnetopt = 2;
 262             } else {
 263                 if (j != i) {
 264                     buf[j] = buf[i];
 265                 }
 266                 j++;
 267             }
 268         }
 269     }
 270     *size = j;
 271 }
 272
 273 static int tcp_get_msgfds(Chardev *chr, int *fds, int num)
 274 {
 275     SocketChardev *s = SOCKET_CHARDEV(chr);
 276
 277     int to_copy = (s->read_msgfds_num < num) ? s->read_msgfds_num : num;
 278
 279     assert(num <= TCP_MAX_FDS);
 280
 281     if (to_copy) {
 282         int i;
 283
 284         memcpy(fds, s->read_msgfds, to_copy * sizeof(int));
 285
 286         /* Close unused fds */
 287         for (i = to_copy; i < s->read_msgfds_num; i++) {
 288             close(s->read_msgfds[i]);
 289         }
 290
 291         g_free(s->read_msgfds);
 292         s->read_msgfds = 0;
 293         s->read_msgfds_num = 0;
 294     }
 295
 296     return to_copy;
 297 }
 298
 299 static int tcp_set_msgfds(Chardev *chr, int *fds, int num)
 300 {
 301     SocketChardev *s = SOCKET_CHARDEV(chr);
 302
 303     /* clear old pending fd array */
 304     g_free(s->write_msgfds);
 305     s->write_msgfds = NULL;
 306     s->write_msgfds_num = 0;
 307
 308     if ((s->state != TCP_CHARDEV_STATE_CONNECTED) ||
 309         !qio_channel_has_feature(s->ioc,
 310                                  QIO_CHANNEL_FEATURE_FD_PASS)) {
 311         return -1;
 312     }
 313
 314     if (num) {
 315         s->write_msgfds = g_new(int, num);
 316         memcpy(s->write_msgfds, fds, num * sizeof(int));
 317     }
 318
 319     s->write_msgfds_num = num;
 320
 321     return 0;
 322 }
 323
 324 static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
 325 {
 326     SocketChardev *s = SOCKET_CHARDEV(chr);
 327     struct iovec iov = { .iov_base = buf, .iov_len = len };
 328     int ret;
 329     size_t i;
 330     int *msgfds = NULL;
 331     size_t msgfds_num = 0;
 332
 333     if (qio_channel_has_feature(s->ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
 334         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 335                                      &msgfds, &msgfds_num,
 336                                      NULL);
 337     } else {
 338         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 339                                      NULL, NULL,
 340                                      NULL);
 341     }
 342
 343     if (ret == QIO_CHANNEL_ERR_BLOCK) {
 344         errno = EAGAIN;
 345         ret = -1;
 346     } else if (ret == -1) {
 347         errno = EIO;
 348     }
 349
 350     if (msgfds_num) {
 351         /* close and clean read_msgfds */
 352         for (i = 0; i < s->read_msgfds_num; i++) {
 353             close(s->read_msgfds[i]);
 354         }
 355
 356         if (s->read_msgfds_num) {
 357             g_free(s->read_msgfds);
 358         }
 359
 360         s->read_msgfds = msgfds;
 361         s->read_msgfds_num = msgfds_num;
 362     }
 363
 364     for (i = 0; i < s->read_msgfds_num; i++) {
 365         int fd = s->read_msgfds[i];
 366         if (fd < 0) {
 367             continue;
 368         }
 369
 370         /* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
 371         qemu_set_block(fd);
 372
 373 #ifndef MSG_CMSG_CLOEXEC
 374         qemu_set_cloexec(fd);
 375 #endif
 376     }
 377
 378     return ret;
 379 }
 380
 381 static GSource *tcp_chr_add_watch(Chardev *chr, GIOCondition cond)
 382 {
 383     SocketChardev *s = SOCKET_CHARDEV(chr);
 384     return qio_channel_create_watch(s->ioc, cond);
 385 }
 386
 387 static void remove_hup_source(SocketChardev *s)
 388 {
 389     if (s->hup_source != NULL) {
 390         g_source_destroy(s->hup_source);
 391         g_source_unref(s->hup_source);
 392         s->hup_source = NULL;
 393     }
 394 }
 395
 396 static void tcp_chr_free_connection(Chardev *chr)
 397 {
 398     SocketChardev *s = SOCKET_CHARDEV(chr);
 399     int i;
 400
 401     if (s->read_msgfds_num) {
 402         for (i = 0; i < s->read_msgfds_num; i++) {
 403             close(s->read_msgfds[i]);
 404         }
 405         g_free(s->read_msgfds);
 406         s->read_msgfds = NULL;
 407         s->read_msgfds_num = 0;
 408     }
 409
 410     remove_hup_source(s);
 411
 412     tcp_set_msgfds(chr, NULL, 0);
 413     remove_fd_in_watch(chr);
 414     object_unref(OBJECT(s->sioc));
 415     s->sioc = NULL;
 416     object_unref(OBJECT(s->ioc));
 417     s->ioc = NULL;
 418     g_free(chr->filename);
 419     chr->filename = NULL;
 420     tcp_chr_change_state(s, TCP_CHARDEV_STATE_DISCONNECTED);
 421 }
 422
 423 static const char *qemu_chr_socket_protocol(SocketChardev *s)
 424 {
 425     if (s->is_telnet) {
 426         return "telnet";
 427     }
 428     return s->is_websock ? "websocket" : "tcp";
 429 }
 430
 431 static char *qemu_chr_socket_address(SocketChardev *s, const char *prefix)
 432 {
 433     switch (s->addr->type) {
 434     case SOCKET_ADDRESS_TYPE_INET:
 435         return g_strdup_printf("%s%s:%s:%s%s", prefix,
 436                                qemu_chr_socket_protocol(s),
 437                                s->addr->u.inet.host,
 438                                s->addr->u.inet.port,
 439                                s->is_listen ? ",server" : "");
 440         break;
 441     case SOCKET_ADDRESS_TYPE_UNIX:
 442         return g_strdup_printf("%sunix:%s%s", prefix,
 443                                s->addr->u.q_unix.path,
 444                                s->is_listen ? ",server" : "");
 445         break;
 446     case SOCKET_ADDRESS_TYPE_FD:
 447         return g_strdup_printf("%sfd:%s%s", prefix, s->addr->u.fd.str,
 448                                s->is_listen ? ",server" : "");
 449         break;
 450     case SOCKET_ADDRESS_TYPE_VSOCK:
 451         return g_strdup_printf("%svsock:%s:%s", prefix,
 452                                s->addr->u.vsock.cid,
 453                                s->addr->u.vsock.port);
 454     default:
 455         abort();
 456     }
 457 }
 458
 459 static void update_disconnected_filename(SocketChardev *s)
 460 {
 461     Chardev *chr = CHARDEV(s);
 462
 463     g_free(chr->filename);
 464     if (s->addr) {
 465         chr->filename = qemu_chr_socket_address(s, "disconnected:");
 466     } else {
 467         chr->filename = g_strdup("disconnected:socket");
 468     }
 469 }
 470
 471 /* NB may be called even if tcp_chr_connect has not been
 472  * reached, due to TLS or telnet initialization failure,
 473  * so can *not* assume s->state == TCP_CHARDEV_STATE_CONNECTED
 474  * This must be called with chr->chr_write_lock held.
 475  */
 476 static void tcp_chr_disconnect_locked(Chardev *chr)
 477 {
 478     SocketChardev *s = SOCKET_CHARDEV(chr);
 479     bool emit_close = s->state == TCP_CHARDEV_STATE_CONNECTED;
 480
 481     tcp_chr_free_connection(chr);
 482
 483     if (s->listener) {
 484         qio_net_listener_set_client_func_full(s->listener, tcp_chr_accept,
 485                                               chr, NULL, chr->gcontext);
 486     }
 487     update_disconnected_filename(s);
 488     if (emit_close) {
 489         qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 490     }
 491     if (s->reconnect_time) {
 492         qemu_chr_socket_restart_timer(chr);
 493     }
 494 }
 495
 496 static void tcp_chr_disconnect(Chardev *chr)
 497 {
 498     qemu_mutex_lock(&chr->chr_write_lock);
 499     tcp_chr_disconnect_locked(chr);
 500     qemu_mutex_unlock(&chr->chr_write_lock);
 501 }
 502
 503 static gboolean tcp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
 504 {
 505     Chardev *chr = CHARDEV(opaque);
 506     SocketChardev *s = SOCKET_CHARDEV(opaque);
 507     uint8_t buf[CHR_READ_BUF_LEN];
 508     int len, size;
 509
 510     if ((s->state != TCP_CHARDEV_STATE_CONNECTED) ||
 511         s->max_size <= 0) {
 512         return TRUE;
 513     }
 514     len = sizeof(buf);
 515     if (len > s->max_size) {
 516         len = s->max_size;
 517     }
 518     size = tcp_chr_recv(chr, (void *)buf, len);
 519     if (size == 0 || (size == -1 && errno != EAGAIN)) {
 520         /* connection closed */
 521         tcp_chr_disconnect(chr);
 522     } else if (size > 0) {
 523         if (s->do_telnetopt) {
 524             tcp_chr_process_IAC_bytes(chr, s, buf, &size);
 525         }
 526         if (size > 0) {
 527             qemu_chr_be_write(chr, buf, size);
 528         }
 529     }
 530
 531     return TRUE;
 532 }
 533
 534 static gboolean tcp_chr_hup(QIOChannel *channel,
 535                                GIOCondition cond,
 536                                void *opaque)
 537 {
 538     Chardev *chr = CHARDEV(opaque);
 539     tcp_chr_disconnect(chr);
 540     return G_SOURCE_REMOVE;
 541 }
 542
 543 static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len)
 544 {
 545     SocketChardev *s = SOCKET_CHARDEV(chr);
 546     int size;
 547
 548     if (s->state != TCP_CHARDEV_STATE_CONNECTED) {
 549         return 0;
 550     }
 551
 552     qio_channel_set_blocking(s->ioc, true, NULL);
 553     size = tcp_chr_recv(chr, (void *) buf, len);
 554     if (s->state != TCP_CHARDEV_STATE_DISCONNECTED) {
 555         qio_channel_set_blocking(s->ioc, false, NULL);
 556     }
 557     if (size == 0) {
 558         /* connection closed */
 559         tcp_chr_disconnect(chr);
 560     }
 561
 562     return size;
 563 }
 564
 565 static char *qemu_chr_compute_filename(SocketChardev *s)
 566 {
 567     struct sockaddr_storage *ss = &s->sioc->localAddr;
 568     struct sockaddr_storage *ps = &s->sioc->remoteAddr;
 569     socklen_t ss_len = s->sioc->localAddrLen;
 570     socklen_t ps_len = s->sioc->remoteAddrLen;
 571     char shost[NI_MAXHOST], sserv[NI_MAXSERV];
 572     char phost[NI_MAXHOST], pserv[NI_MAXSERV];
 573     const char *left = "", *right = "";
 574
 575     switch (ss->ss_family) {
 576 #ifndef _WIN32
 577     case AF_UNIX:
 578         return g_strdup_printf("unix:%s%s",
 579                                ((struct sockaddr_un *)(ss))->sun_path,
 580                                s->is_listen ? ",server" : "");
 581 #endif
 582     case AF_INET6:
 583         left  = "[";
 584         right = "]";
 585         /* fall through */
 586     case AF_INET:
 587         getnameinfo((struct sockaddr *) ss, ss_len, shost, sizeof(shost),
 588                     sserv, sizeof(sserv), NI_NUMERICHOST | NI_NUMERICSERV);
 589         getnameinfo((struct sockaddr *) ps, ps_len, phost, sizeof(phost),
 590                     pserv, sizeof(pserv), NI_NUMERICHOST | NI_NUMERICSERV);
 591         return g_strdup_printf("%s:%s%s%s:%s%s <-> %s%s%s:%s",
 592                                qemu_chr_socket_protocol(s),
 593                                left, shost, right, sserv,
 594                                s->is_listen ? ",server" : "",
 595                                left, phost, right, pserv);
 596
 597     default:
 598         return g_strdup_printf("unknown");
 599     }
 600 }
 601
 602 static void update_ioc_handlers(SocketChardev *s)
 603 {
 604     Chardev *chr = CHARDEV(s);
 605
 606     if (s->state != TCP_CHARDEV_STATE_CONNECTED) {
 607         return;
 608     }
 609
 610     remove_fd_in_watch(chr);
 611     chr->gsource = io_add_watch_poll(chr, s->ioc,
 612                                      tcp_chr_read_poll,
 613                                      tcp_chr_read, chr,
 614                                      chr->gcontext);
 615
 616     remove_hup_source(s);
 617     s->hup_source = qio_channel_create_watch(s->ioc, G_IO_HUP);
 618     g_source_set_callback(s->hup_source, (GSourceFunc)tcp_chr_hup,
 619                           chr, NULL);
 620     g_source_attach(s->hup_source, chr->gcontext);
 621 }
 622
 623 static void tcp_chr_connect(void *opaque)
 624 {
 625     Chardev *chr = CHARDEV(opaque);
 626     SocketChardev *s = SOCKET_CHARDEV(opaque);
 627
 628     g_free(chr->filename);
 629     chr->filename = qemu_chr_compute_filename(s);
 630
 631     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTED);
 632     update_ioc_handlers(s);
 633     qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 634 }
 635
 636 static void tcp_chr_telnet_destroy(SocketChardev *s)
 637 {
 638     if (s->telnet_source) {
 639         g_source_destroy(s->telnet_source);
 640         g_source_unref(s->telnet_source);
 641         s->telnet_source = NULL;
 642     }
 643 }
 644
 645 static void tcp_chr_update_read_handler(Chardev *chr)
 646 {
 647     SocketChardev *s = SOCKET_CHARDEV(chr);
 648
 649     if (s->listener && s->state == TCP_CHARDEV_STATE_DISCONNECTED) {
 650         /*
 651          * It's possible that chardev context is changed in
 652          * qemu_chr_be_update_read_handlers().  Reset it for QIO net
 653          * listener if there is.
 654          */
 655         qio_net_listener_set_client_func_full(s->listener, tcp_chr_accept,
 656                                               chr, NULL, chr->gcontext);
 657     }
 658
 659     if (s->telnet_source) {
 660         tcp_chr_telnet_init(CHARDEV(s));
 661     }
 662
 663     update_ioc_handlers(s);
 664 }
 665
 666 static gboolean tcp_chr_telnet_init_io(QIOChannel *ioc,
 667                                        GIOCondition cond G_GNUC_UNUSED,
 668                                        gpointer user_data)
 669 {
 670     SocketChardev *s = user_data;
 671     Chardev *chr = CHARDEV(s);
 672     TCPChardevTelnetInit *init = s->telnet_init;
 673     ssize_t ret;
 674
 675     assert(init);
 676
 677     ret = qio_channel_write(ioc, init->buf, init->buflen, NULL);
 678     if (ret < 0) {
 679         if (ret == QIO_CHANNEL_ERR_BLOCK) {
 680             ret = 0;
 681         } else {
 682             tcp_chr_disconnect(chr);
 683             goto end;
 684         }
 685     }
 686     init->buflen -= ret;
 687
 688     if (init->buflen == 0) {
 689         tcp_chr_connect(chr);
 690         goto end;
 691     }
 692
 693     memmove(init->buf, init->buf + ret, init->buflen);
 694
 695     return G_SOURCE_CONTINUE;
 696
 697 end:
 698     g_free(s->telnet_init);
 699     s->telnet_init = NULL;
 700     g_source_unref(s->telnet_source);
 701     s->telnet_source = NULL;
 702     return G_SOURCE_REMOVE;
 703 }
 704
 705 static void tcp_chr_telnet_init(Chardev *chr)
 706 {
 707     SocketChardev *s = SOCKET_CHARDEV(chr);
 708     TCPChardevTelnetInit *init;
 709     size_t n = 0;
 710
 711     /* Destroy existing task */
 712     tcp_chr_telnet_destroy(s);
 713
 714     if (s->telnet_init) {
 715         /* We are possibly during a handshake already */
 716         goto cont;
 717     }
 718
 719     s->telnet_init = g_new0(TCPChardevTelnetInit, 1);
 720     init = s->telnet_init;
 721
 722 #define IACSET(x, a, b, c)                      \
 723     do {                                        \
 724         x[n++] = a;                             \
 725         x[n++] = b;                             \
 726         x[n++] = c;                             \
 727     } while (0)
 728
 729     if (!s->is_tn3270) {
 730         init->buflen = 12;
 731         /* Prep the telnet negotion to put telnet in binary,
 732          * no echo, single char mode */
 733         IACSET(init->buf, 0xff, 0xfb, 0x01);  /* IAC WILL ECHO */
 734         IACSET(init->buf, 0xff, 0xfb, 0x03);  /* IAC WILL Suppress go ahead */
 735         IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL Binary */
 736         IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO Binary */
 737     } else {
 738         init->buflen = 21;
 739         /* Prep the TN3270 negotion based on RFC1576 */
 740         IACSET(init->buf, 0xff, 0xfd, 0x19);  /* IAC DO EOR */
 741         IACSET(init->buf, 0xff, 0xfb, 0x19);  /* IAC WILL EOR */
 742         IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO BINARY */
 743         IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL BINARY */
 744         IACSET(init->buf, 0xff, 0xfd, 0x18);  /* IAC DO TERMINAL TYPE */
 745         IACSET(init->buf, 0xff, 0xfa, 0x18);  /* IAC SB TERMINAL TYPE */
 746         IACSET(init->buf, 0x01, 0xff, 0xf0);  /* SEND IAC SE */
 747     }
 748
 749 #undef IACSET
 750
 751 cont:
 752     s->telnet_source = qio_channel_add_watch_source(s->ioc, G_IO_OUT,
 753                                                     tcp_chr_telnet_init_io,
 754                                                     s, NULL,
 755                                                     chr->gcontext);
 756 }
 757
 758
 759 static void tcp_chr_websock_handshake(QIOTask *task, gpointer user_data)
 760 {
 761     Chardev *chr = user_data;
 762     SocketChardev *s = user_data;
 763
 764     if (qio_task_propagate_error(task, NULL)) {
 765         tcp_chr_disconnect(chr);
 766     } else {
 767         if (s->do_telnetopt) {
 768             tcp_chr_telnet_init(chr);
 769         } else {
 770             tcp_chr_connect(chr);
 771         }
 772     }
 773 }
 774
 775
 776 static void tcp_chr_websock_init(Chardev *chr)
 777 {
 778     SocketChardev *s = SOCKET_CHARDEV(chr);
 779     QIOChannelWebsock *wioc = NULL;
 780     gchar *name;
 781
 782     wioc = qio_channel_websock_new_server(s->ioc);
 783
 784     name = g_strdup_printf("chardev-websocket-server-%s", chr->label);
 785     qio_channel_set_name(QIO_CHANNEL(wioc), name);
 786     g_free(name);
 787     object_unref(OBJECT(s->ioc));
 788     s->ioc = QIO_CHANNEL(wioc);
 789
 790     qio_channel_websock_handshake(wioc, tcp_chr_websock_handshake, chr, NULL);
 791 }
 792
 793
 794 static void tcp_chr_tls_handshake(QIOTask *task,
 795                                   gpointer user_data)
 796 {
 797     Chardev *chr = user_data;
 798     SocketChardev *s = user_data;
 799
 800     if (qio_task_propagate_error(task, NULL)) {
 801         tcp_chr_disconnect(chr);
 802     } else {
 803         if (s->is_websock) {
 804             tcp_chr_websock_init(chr);
 805         } else if (s->do_telnetopt) {
 806             tcp_chr_telnet_init(chr);
 807         } else {
 808             tcp_chr_connect(chr);
 809         }
 810     }
 811 }
 812
 813
 814 static void tcp_chr_tls_init(Chardev *chr)
 815 {
 816     SocketChardev *s = SOCKET_CHARDEV(chr);
 817     QIOChannelTLS *tioc;
 818     Error *err = NULL;
 819     gchar *name;
 820
 821     if (s->is_listen) {
 822         tioc = qio_channel_tls_new_server(
 823             s->ioc, s->tls_creds,
 824             s->tls_authz,
 825             &err);
 826     } else {
 827         tioc = qio_channel_tls_new_client(
 828             s->ioc, s->tls_creds,
 829             s->addr->u.inet.host,
 830             &err);
 831     }
 832     if (tioc == NULL) {
 833         error_free(err);
 834         tcp_chr_disconnect(chr);
 835         return;
 836     }
 837     name = g_strdup_printf("chardev-tls-%s-%s",
 838                            s->is_listen ? "server" : "client",
 839                            chr->label);
 840     qio_channel_set_name(QIO_CHANNEL(tioc), name);
 841     g_free(name);
 842     object_unref(OBJECT(s->ioc));
 843     s->ioc = QIO_CHANNEL(tioc);
 844
 845     qio_channel_tls_handshake(tioc,
 846                               tcp_chr_tls_handshake,
 847                               chr,
 848                               NULL,
 849                               chr->gcontext);
 850 }
 851
 852
 853 static void tcp_chr_set_client_ioc_name(Chardev *chr,
 854                                         QIOChannelSocket *sioc)
 855 {
 856     SocketChardev *s = SOCKET_CHARDEV(chr);
 857     char *name;
 858     name = g_strdup_printf("chardev-tcp-%s-%s",
 859                            s->is_listen ? "server" : "client",
 860                            chr->label);
 861     qio_channel_set_name(QIO_CHANNEL(sioc), name);
 862     g_free(name);
 863
 864 }
 865
 866 static int tcp_chr_new_client(Chardev *chr, QIOChannelSocket *sioc)
 867 {
 868     SocketChardev *s = SOCKET_CHARDEV(chr);
 869
 870     if (s->state != TCP_CHARDEV_STATE_CONNECTING) {
 871         return -1;
 872     }
 873
 874     s->ioc = QIO_CHANNEL(sioc);
 875     object_ref(OBJECT(sioc));
 876     s->sioc = sioc;
 877     object_ref(OBJECT(sioc));
 878
 879     qio_channel_set_blocking(s->ioc, false, NULL);
 880
 881     if (s->do_nodelay) {
 882         qio_channel_set_delay(s->ioc, false);
 883     }
 884     if (s->listener) {
 885         qio_net_listener_set_client_func_full(s->listener, NULL, NULL,
 886                                               NULL, chr->gcontext);
 887     }
 888
 889     if (s->tls_creds) {
 890         tcp_chr_tls_init(chr);
 891     } else if (s->is_websock) {
 892         tcp_chr_websock_init(chr);
 893     } else if (s->do_telnetopt) {
 894         tcp_chr_telnet_init(chr);
 895     } else {
 896         tcp_chr_connect(chr);
 897     }
 898
 899     return 0;
 900 }
 901
 902
 903 static int tcp_chr_add_client(Chardev *chr, int fd)
 904 {
 905     int ret;
 906     QIOChannelSocket *sioc;
 907     SocketChardev *s = SOCKET_CHARDEV(chr);
 908
 909     if (s->state != TCP_CHARDEV_STATE_DISCONNECTED) {
 910         return -1;
 911     }
 912
 913     sioc = qio_channel_socket_new_fd(fd, NULL);
 914     if (!sioc) {
 915         return -1;
 916     }
 917     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 918     tcp_chr_set_client_ioc_name(chr, sioc);
 919     ret = tcp_chr_new_client(chr, sioc);
 920     object_unref(OBJECT(sioc));
 921     return ret;
 922 }
 923
 924 static void tcp_chr_accept(QIONetListener *listener,
 925                            QIOChannelSocket *cioc,
 926                            void *opaque)
 927 {
 928     Chardev *chr = CHARDEV(opaque);
 929     SocketChardev *s = SOCKET_CHARDEV(chr);
 930
 931     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 932     tcp_chr_set_client_ioc_name(chr, cioc);
 933     tcp_chr_new_client(chr, cioc);
 934 }
 935
 936
 937 static int tcp_chr_connect_client_sync(Chardev *chr, Error **errp)
 938 {
 939     SocketChardev *s = SOCKET_CHARDEV(chr);
 940     QIOChannelSocket *sioc = qio_channel_socket_new();
 941     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 942     tcp_chr_set_client_ioc_name(chr, sioc);
 943     if (qio_channel_socket_connect_sync(sioc, s->addr, errp) < 0) {
 944         tcp_chr_change_state(s, TCP_CHARDEV_STATE_DISCONNECTED);
 945         object_unref(OBJECT(sioc));
 946         return -1;
 947     }
 948     tcp_chr_new_client(chr, sioc);
 949     object_unref(OBJECT(sioc));
 950     return 0;
 951 }
 952
 953
 954 static void tcp_chr_accept_server_sync(Chardev *chr)
 955 {
 956     SocketChardev *s = SOCKET_CHARDEV(chr);
 957     QIOChannelSocket *sioc;
 958     info_report("QEMU waiting for connection on: %s",
 959                 chr->filename);
 960     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 961     sioc = qio_net_listener_wait_client(s->listener);
 962     tcp_chr_set_client_ioc_name(chr, sioc);
 963     tcp_chr_new_client(chr, sioc);
 964     object_unref(OBJECT(sioc));
 965 }
 966
 967
 968 static int tcp_chr_wait_connected(Chardev *chr, Error **errp)
 969 {
 970     SocketChardev *s = SOCKET_CHARDEV(chr);
 971     const char *opts[] = { "telnet", "tn3270", "websock", "tls-creds" };
 972     bool optset[] = { s->is_telnet, s->is_tn3270, s->is_websock, s->tls_creds };
 973     size_t i;
 974
 975     QEMU_BUILD_BUG_ON(G_N_ELEMENTS(opts) != G_N_ELEMENTS(optset));
 976     for (i = 0; i < G_N_ELEMENTS(opts); i++) {
 977         if (optset[i]) {
 978             error_setg(errp,
 979                        "'%s' option is incompatible with waiting for "
 980                        "connection completion", opts[i]);
 981             return -1;
 982         }
 983     }
 984
 985     tcp_chr_reconn_timer_cancel(s);
 986
 987     /*
 988      * We expect states to be as follows:
 989      *
 990      *  - server
 991      *    - wait   -> CONNECTED
 992      *    - nowait -> DISCONNECTED
 993      *  - client
 994      *    - reconnect == 0 -> CONNECTED
 995      *    - reconnect != 0 -> CONNECTING
 996      *
 997      */
 998     if (s->state == TCP_CHARDEV_STATE_CONNECTING) {
 999         if (!s->connect_task) {
1000             error_setg(errp,
1001                        "Unexpected 'connecting' state without connect task "
1002                        "while waiting for connection completion");
1003             return -1;
1004         }
1005         /*
1006          * tcp_chr_wait_connected should only ever be run from the
1007          * main loop thread associated with chr->gcontext, otherwise
1008          * qio_task_wait_thread has a dangerous race condition with
1009          * free'ing of the s->connect_task object.
1010          *
1011          * Acquiring the main context doesn't 100% prove we're in
1012          * the main loop thread, but it does at least guarantee
1013          * that the main loop won't be executed by another thread
1014          * avoiding the race condition with the task idle callback.
1015          */
1016         g_main_context_acquire(chr->gcontext);
1017         qio_task_wait_thread(s->connect_task);
1018         g_main_context_release(chr->gcontext);
1019
1020         /*
1021          * The completion callback (qemu_chr_socket_connected) for
1022          * s->connect_task should have set this to NULL by the time
1023          * qio_task_wait_thread has returned.
1024          */
1025         assert(!s->connect_task);
1026
1027         /*
1028          * NB we are *not* guaranteed to have "s->state == ..CONNECTED"
1029          * at this point as this first connect may be failed, so
1030          * allow the next loop to run regardless.
1031          */
1032     }
1033
1034     while (s->state != TCP_CHARDEV_STATE_CONNECTED) {
1035         if (s->is_listen) {
1036             tcp_chr_accept_server_sync(chr);
1037         } else {
1038             Error *err = NULL;
1039             if (tcp_chr_connect_client_sync(chr, &err) < 0) {
1040                 if (s->reconnect_time) {
1041                     error_free(err);
1042                     g_usleep(s->reconnect_time * 1000ULL * 1000ULL);
1043                 } else {
1044                     error_propagate(errp, err);
1045                     return -1;
1046                 }
1047             }
1048         }
1049     }
1050
1051     return 0;
1052 }
1053
1054 static void char_socket_finalize(Object *obj)
1055 {
1056     Chardev *chr = CHARDEV(obj);
1057     SocketChardev *s = SOCKET_CHARDEV(obj);
1058
1059     tcp_chr_free_connection(chr);
1060     tcp_chr_reconn_timer_cancel(s);
1061     qapi_free_SocketAddress(s->addr);
1062     tcp_chr_telnet_destroy(s);
1063     g_free(s->telnet_init);
1064     if (s->listener) {
1065         qio_net_listener_set_client_func_full(s->listener, NULL, NULL,
1066                                               NULL, chr->gcontext);
1067         object_unref(OBJECT(s->listener));
1068     }
1069     if (s->tls_creds) {
1070         object_unref(OBJECT(s->tls_creds));
1071     }
1072     g_free(s->tls_authz);
1073
1074     qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
1075 }
1076
1077 static void qemu_chr_socket_connected(QIOTask *task, void *opaque)
1078 {
1079     QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
1080     Chardev *chr = CHARDEV(opaque);
1081     SocketChardev *s = SOCKET_CHARDEV(chr);
1082     Error *err = NULL;
1083
1084     s->connect_task = NULL;
1085
1086     if (qio_task_propagate_error(task, &err)) {
1087         tcp_chr_change_state(s, TCP_CHARDEV_STATE_DISCONNECTED);
1088         check_report_connect_error(chr, err);
1089         error_free(err);
1090         goto cleanup;
1091     }
1092
1093     s->connect_err_reported = false;
1094     tcp_chr_new_client(chr, sioc);
1095
1096 cleanup:
1097     object_unref(OBJECT(sioc));
1098 }
1099
1100
1101 static void tcp_chr_connect_client_task(QIOTask *task,
1102                                         gpointer opaque)
1103 {
1104     QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
1105     SocketAddress *addr = opaque;
1106     Error *err = NULL;
1107
1108     qio_channel_socket_connect_sync(ioc, addr, &err);
1109
1110     qio_task_set_error(task, err);
1111 }
1112
1113
1114 static void tcp_chr_connect_client_async(Chardev *chr)
1115 {
1116     SocketChardev *s = SOCKET_CHARDEV(chr);
1117     QIOChannelSocket *sioc;
1118
1119     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
1120     sioc = qio_channel_socket_new();
1121     tcp_chr_set_client_ioc_name(chr, sioc);
1122     /*
1123      * Normally code would use the qio_channel_socket_connect_async
1124      * method which uses a QIOTask + qio_task_set_error internally
1125      * to avoid blocking. The tcp_chr_wait_connected method, however,
1126      * needs a way to synchronize with completion of the background
1127      * connect task which can't be done with the QIOChannelSocket
1128      * async APIs. Thus we must use QIOTask directly to implement
1129      * the non-blocking concept locally.
1130      */
1131     s->connect_task = qio_task_new(OBJECT(sioc),
1132                                    qemu_chr_socket_connected,
1133                                    chr, NULL);
1134     qio_task_run_in_thread(s->connect_task,
1135                            tcp_chr_connect_client_task,
1136                            s->addr,
1137                            NULL,
1138                            chr->gcontext);
1139 }
1140
1141 static gboolean socket_reconnect_timeout(gpointer opaque)
1142 {
1143     Chardev *chr = CHARDEV(opaque);
1144     SocketChardev *s = SOCKET_CHARDEV(opaque);
1145
1146     qemu_mutex_lock(&chr->chr_write_lock);
1147     g_source_unref(s->reconnect_timer);
1148     s->reconnect_timer = NULL;
1149     qemu_mutex_unlock(&chr->chr_write_lock);
1150
1151     if (chr->be_open) {
1152         return false;
1153     }
1154
1155     tcp_chr_connect_client_async(chr);
1156
1157     return false;
1158 }
1159
1160
1161 static int qmp_chardev_open_socket_server(Chardev *chr,
1162                                           bool is_telnet,
1163                                           bool is_waitconnect,
1164                                           Error **errp)
1165 {
1166     SocketChardev *s = SOCKET_CHARDEV(chr);
1167     char *name;
1168     if (is_telnet) {
1169         s->do_telnetopt = 1;
1170     }
1171     s->listener = qio_net_listener_new();
1172
1173     name = g_strdup_printf("chardev-tcp-listener-%s", chr->label);
1174     qio_net_listener_set_name(s->listener, name);
1175     g_free(name);
1176
1177     if (qio_net_listener_open_sync(s->listener, s->addr, 1, errp) < 0) {
1178         object_unref(OBJECT(s->listener));
1179         s->listener = NULL;
1180         return -1;
1181     }
1182
1183     qapi_free_SocketAddress(s->addr);
1184     s->addr = socket_local_address(s->listener->sioc[0]->fd, errp);
1185     update_disconnected_filename(s);
1186
1187     if (is_waitconnect) {
1188         tcp_chr_accept_server_sync(chr);
1189     } else {
1190         qio_net_listener_set_client_func_full(s->listener,
1191                                               tcp_chr_accept,
1192                                               chr, NULL,
1193                                               chr->gcontext);
1194     }
1195
1196     return 0;
1197 }
1198
1199
1200 static int qmp_chardev_open_socket_client(Chardev *chr,
1201                                           int64_t reconnect,
1202                                           Error **errp)
1203 {
1204     SocketChardev *s = SOCKET_CHARDEV(chr);
1205
1206     if (reconnect > 0) {
1207         s->reconnect_time = reconnect;
1208         tcp_chr_connect_client_async(chr);
1209         return 0;
1210     } else {
1211         return tcp_chr_connect_client_sync(chr, errp);
1212     }
1213 }
1214
1215
1216 static bool qmp_chardev_validate_socket(ChardevSocket *sock,
1217                                         SocketAddress *addr,
1218                                         Error **errp)
1219 {
1220     /* Validate any options which have a dependency on address type */
1221     switch (addr->type) {
1222     case SOCKET_ADDRESS_TYPE_FD:
1223         if (sock->has_reconnect) {
1224             error_setg(errp,
1225                        "'reconnect' option is incompatible with "
1226                        "'fd' address type");
1227             return false;
1228         }
1229         if (sock->has_tls_creds &&
1230             !(sock->has_server && sock->server)) {
1231             error_setg(errp,
1232                        "'tls_creds' option is incompatible with "
1233                        "'fd' address type as client");
1234             return false;
1235         }
1236         break;
1237
1238     case SOCKET_ADDRESS_TYPE_UNIX:
1239         if (sock->has_tls_creds) {
1240             error_setg(errp,
1241                        "'tls_creds' option is incompatible with "
1242                        "'unix' address type");
1243             return false;
1244         }
1245         break;
1246
1247     case SOCKET_ADDRESS_TYPE_INET:
1248         break;
1249
1250     case SOCKET_ADDRESS_TYPE_VSOCK:
1251         if (sock->has_tls_creds) {
1252             error_setg(errp,
1253                        "'tls_creds' option is incompatible with "
1254                        "'vsock' address type");
1255             return false;
1256         }
1257
1258     default:
1259         break;
1260     }
1261
1262     if (sock->has_tls_authz && !sock->has_tls_creds) {
1263         error_setg(errp, "'tls_authz' option requires 'tls_creds' option");
1264         return false;
1265     }
1266
1267     /* Validate any options which have a dependancy on client vs server */
1268     if (!sock->has_server || sock->server) {
1269         if (sock->has_reconnect) {
1270             error_setg(errp,
1271                        "'reconnect' option is incompatible with "
1272                        "socket in server listen mode");
1273             return false;
1274         }
1275     } else {
1276         if (sock->has_websocket && sock->websocket) {
1277             error_setg(errp, "%s", "Websocket client is not implemented");
1278             return false;
1279         }
1280         if (sock->has_wait) {
1281             warn_report("'wait' option is deprecated with "
1282                         "socket in client connect mode");
1283             if (sock->wait) {
1284                 error_setg(errp, "%s",
1285                            "'wait' option is incompatible with "
1286                            "socket in client connect mode");
1287                 return false;
1288             }
1289         }
1290     }
1291
1292     return true;
1293 }
1294
1295
1296 static void qmp_chardev_open_socket(Chardev *chr,
1297                                     ChardevBackend *backend,
1298                                     bool *be_opened,
1299                                     Error **errp)
1300 {
1301     SocketChardev *s = SOCKET_CHARDEV(chr);
1302     ChardevSocket *sock = backend->u.socket.data;
1303     bool do_nodelay     = sock->has_nodelay ? sock->nodelay : false;
1304     bool is_listen      = sock->has_server  ? sock->server  : true;
1305     bool is_telnet      = sock->has_telnet  ? sock->telnet  : false;
1306     bool is_tn3270      = sock->has_tn3270  ? sock->tn3270  : false;
1307     bool is_waitconnect = sock->has_wait    ? sock->wait    : false;
1308     bool is_websock     = sock->has_websocket ? sock->websocket : false;
1309     int64_t reconnect   = sock->has_reconnect ? sock->reconnect : 0;
1310     SocketAddress *addr;
1311
1312     s->is_listen = is_listen;
1313     s->is_telnet = is_telnet;
1314     s->is_tn3270 = is_tn3270;
1315     s->is_websock = is_websock;
1316     s->do_nodelay = do_nodelay;
1317     if (sock->tls_creds) {
1318         Object *creds;
1319         creds = object_resolve_path_component(
1320             object_get_objects_root(), sock->tls_creds);
1321         if (!creds) {
1322             error_setg(errp, "No TLS credentials with id '%s'",
1323                        sock->tls_creds);
1324             return;
1325         }
1326         s->tls_creds = (QCryptoTLSCreds *)
1327             object_dynamic_cast(creds,
1328                                 TYPE_QCRYPTO_TLS_CREDS);
1329         if (!s->tls_creds) {
1330             error_setg(errp, "Object with id '%s' is not TLS credentials",
1331                        sock->tls_creds);
1332             return;
1333         }
1334         object_ref(OBJECT(s->tls_creds));
1335         if (is_listen) {
1336             if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
1337                 error_setg(errp, "%s",
1338                            "Expected TLS credentials for server endpoint");
1339                 return;
1340             }
1341         } else {
1342             if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
1343                 error_setg(errp, "%s",
1344                            "Expected TLS credentials for client endpoint");
1345                 return;
1346             }
1347         }
1348     }
1349     s->tls_authz = g_strdup(sock->tls_authz);
1350
1351     s->addr = addr = socket_address_flatten(sock->addr);
1352
1353     if (!qmp_chardev_validate_socket(sock, addr, errp)) {
1354         return;
1355     }
1356
1357     qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE);
1358     /* TODO SOCKET_ADDRESS_FD where fd has AF_UNIX */
1359     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1360         qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_FD_PASS);
1361     }
1362
1363     /* be isn't opened until we get a connection */
1364     *be_opened = false;
1365
1366     update_disconnected_filename(s);
1367
1368     if (s->is_listen) {
1369         if (qmp_chardev_open_socket_server(chr, is_telnet || is_tn3270,
1370                                            is_waitconnect, errp) < 0) {
1371             return;
1372         }
1373     } else {
1374         if (qmp_chardev_open_socket_client(chr, reconnect, errp) < 0) {
1375             return;
1376         }
1377     }
1378 }
1379
1380 static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
1381                                   Error **errp)
1382 {
1383     const char *path = qemu_opt_get(opts, "path");
1384     const char *host = qemu_opt_get(opts, "host");
1385     const char *port = qemu_opt_get(opts, "port");
1386     const char *fd = qemu_opt_get(opts, "fd");
1387     bool tight = qemu_opt_get_bool(opts, "tight", true);
1388     bool abstract = qemu_opt_get_bool(opts, "abstract", false);
1389     SocketAddressLegacy *addr;
1390     ChardevSocket *sock;
1391
1392     if ((!!path + !!fd + !!host) != 1) {
1393         error_setg(errp,
1394                    "Exactly one of 'path', 'fd' or 'host' required");
1395         return;
1396     }
1397
1398     if (host && !port) {
1399         error_setg(errp, "chardev: socket: no port given");
1400         return;
1401     }
1402
1403     backend->type = CHARDEV_BACKEND_KIND_SOCKET;
1404     sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
1405     qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));
1406
1407     sock->has_nodelay = qemu_opt_get(opts, "delay");
1408     sock->nodelay = !qemu_opt_get_bool(opts, "delay", true);
1409     /*
1410      * We have different default to QMP for 'server', hence
1411      * we can't just check for existence of 'server'
1412      */
1413     sock->has_server = true;
1414     sock->server = qemu_opt_get_bool(opts, "server", false);
1415     sock->has_telnet = qemu_opt_get(opts, "telnet");
1416     sock->telnet = qemu_opt_get_bool(opts, "telnet", false);
1417     sock->has_tn3270 = qemu_opt_get(opts, "tn3270");
1418     sock->tn3270 = qemu_opt_get_bool(opts, "tn3270", false);
1419     sock->has_websocket = qemu_opt_get(opts, "websocket");
1420     sock->websocket = qemu_opt_get_bool(opts, "websocket", false);
1421     /*
1422      * We have different default to QMP for 'wait' when 'server'
1423      * is set, hence we can't just check for existence of 'wait'
1424      */
1425     sock->has_wait = qemu_opt_find(opts, "wait") || sock->server;
1426     sock->wait = qemu_opt_get_bool(opts, "wait", true);
1427     sock->has_reconnect = qemu_opt_find(opts, "reconnect");
1428     sock->reconnect = qemu_opt_get_number(opts, "reconnect", 0);
1429     sock->has_tls_creds = qemu_opt_get(opts, "tls-creds");
1430     sock->tls_creds = g_strdup(qemu_opt_get(opts, "tls-creds"));
1431     sock->has_tls_authz = qemu_opt_get(opts, "tls-authz");
1432     sock->tls_authz = g_strdup(qemu_opt_get(opts, "tls-authz"));
1433
1434     addr = g_new0(SocketAddressLegacy, 1);
1435     if (path) {
1436         UnixSocketAddress *q_unix;
1437         addr->type = SOCKET_ADDRESS_LEGACY_KIND_UNIX;
1438         q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
1439         q_unix->path = g_strdup(path);
1440         q_unix->tight = tight;
1441         q_unix->abstract = abstract;
1442     } else if (host) {
1443         addr->type = SOCKET_ADDRESS_LEGACY_KIND_INET;
1444         addr->u.inet.data = g_new(InetSocketAddress, 1);
1445         *addr->u.inet.data = (InetSocketAddress) {
1446             .host = g_strdup(host),
1447             .port = g_strdup(port),
1448             .has_to = qemu_opt_get(opts, "to"),
1449             .to = qemu_opt_get_number(opts, "to", 0),
1450             .has_ipv4 = qemu_opt_get(opts, "ipv4"),
1451             .ipv4 = qemu_opt_get_bool(opts, "ipv4", 0),
1452             .has_ipv6 = qemu_opt_get(opts, "ipv6"),
1453             .ipv6 = qemu_opt_get_bool(opts, "ipv6", 0),
1454         };
1455     } else if (fd) {
1456         addr->type = SOCKET_ADDRESS_LEGACY_KIND_FD;
1457         addr->u.fd.data = g_new(String, 1);
1458         addr->u.fd.data->str = g_strdup(fd);
1459     } else {
1460         g_assert_not_reached();
1461     }
1462     sock->addr = addr;
1463 }
1464
1465 static void
1466 char_socket_get_addr(Object *obj, Visitor *v, const char *name,
1467                      void *opaque, Error **errp)
1468 {
1469     SocketChardev *s = SOCKET_CHARDEV(obj);
1470
1471     visit_type_SocketAddress(v, name, &s->addr, errp);
1472 }
1473
1474 static bool
1475 char_socket_get_connected(Object *obj, Error **errp)
1476 {
1477     SocketChardev *s = SOCKET_CHARDEV(obj);
1478
1479     return s->state == TCP_CHARDEV_STATE_CONNECTED;
1480 }
1481
1482 static void char_socket_class_init(ObjectClass *oc, void *data)
1483 {
1484     ChardevClass *cc = CHARDEV_CLASS(oc);
1485
1486     cc->parse = qemu_chr_parse_socket;
1487     cc->open = qmp_chardev_open_socket;
1488     cc->chr_wait_connected = tcp_chr_wait_connected;
1489     cc->chr_write = tcp_chr_write;
1490     cc->chr_sync_read = tcp_chr_sync_read;
1491     cc->chr_disconnect = tcp_chr_disconnect;
1492     cc->get_msgfds = tcp_get_msgfds;
1493     cc->set_msgfds = tcp_set_msgfds;
1494     cc->chr_add_client = tcp_chr_add_client;
1495     cc->chr_add_watch = tcp_chr_add_watch;
1496     cc->chr_update_read_handler = tcp_chr_update_read_handler;
1497
1498     object_class_property_add(oc, "addr", "SocketAddress",
1499                               char_socket_get_addr, NULL,
1500                               NULL, NULL);
1501
1502     object_class_property_add_bool(oc, "connected", char_socket_get_connected,
1503                                    NULL);
1504 }
1505
1506 static const TypeInfo char_socket_type_info = {
1507     .name = TYPE_CHARDEV_SOCKET,
1508     .parent = TYPE_CHARDEV,
1509     .instance_size = sizeof(SocketChardev),
1510     .instance_finalize = char_socket_finalize,
1511     .class_init = char_socket_class_init,
1512 };
1513
1514 static void register_types(void)
1515 {
1516     type_register_static(&char_socket_type_info);
1517 }
1518
1519 type_init(register_types);