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-websock.h"
  29 #include "qemu/error-report.h"
  30 #include "qemu/module.h"
  31 #include "qemu/option.h"
  32 #include "qapi/error.h"
  33 #include "qapi/clone-visitor.h"
  34 #include "qapi/qapi-visit-sockets.h"
  35 #include "qemu/yank.h"
  36
  37 #include "chardev/char-io.h"
  38 #include "chardev/char-socket.h"
  39
  40 static gboolean socket_reconnect_timeout(gpointer opaque);
  41 static void tcp_chr_telnet_init(Chardev *chr);
  42
  43 static void tcp_chr_change_state(SocketChardev *s, TCPChardevState state)
  44 {
  45     switch (state) {
  46     case TCP_CHARDEV_STATE_DISCONNECTED:
  47         break;
  48     case TCP_CHARDEV_STATE_CONNECTING:
  49         assert(s->state == TCP_CHARDEV_STATE_DISCONNECTED);
  50         break;
  51     case TCP_CHARDEV_STATE_CONNECTED:
  52         assert(s->state == TCP_CHARDEV_STATE_CONNECTING);
  53         break;
  54     }
  55     s->state = state;
  56 }
  57
  58 static void tcp_chr_reconn_timer_cancel(SocketChardev *s)
  59 {
  60     if (s->reconnect_timer) {
  61         g_source_destroy(s->reconnect_timer);
  62         g_source_unref(s->reconnect_timer);
  63         s->reconnect_timer = NULL;
  64     }
  65 }
  66
  67 static void qemu_chr_socket_restart_timer(Chardev *chr)
  68 {
  69     SocketChardev *s = SOCKET_CHARDEV(chr);
  70     char *name;
  71
  72     assert(s->state == TCP_CHARDEV_STATE_DISCONNECTED);
  73     assert(!s->reconnect_timer);
  74     name = g_strdup_printf("chardev-socket-reconnect-%s", chr->label);
  75     s->reconnect_timer = qemu_chr_timeout_add_ms(chr,
  76                                                  s->reconnect_time * 1000,
  77                                                  socket_reconnect_timeout,
  78                                                  chr);
  79     g_source_set_name(s->reconnect_timer, name);
  80     g_free(name);
  81 }
  82
  83 static void check_report_connect_error(Chardev *chr,
  84                                        Error *err)
  85 {
  86     SocketChardev *s = SOCKET_CHARDEV(chr);
  87
  88     if (!s->connect_err_reported) {
  89         error_reportf_err(err,
  90                           "Unable to connect character device %s: ",
  91                           chr->label);
  92         s->connect_err_reported = true;
  93     } else {
  94         error_free(err);
  95     }
  96     qemu_chr_socket_restart_timer(chr);
  97 }
  98
  99 static void tcp_chr_accept(QIONetListener *listener,
 100                            QIOChannelSocket *cioc,
 101                            void *opaque);
 102
 103 static int tcp_chr_read_poll(void *opaque);
 104 static void tcp_chr_disconnect_locked(Chardev *chr);
 105
 106 /* Called with chr_write_lock held.  */
 107 static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
 108 {
 109     SocketChardev *s = SOCKET_CHARDEV(chr);
 110
 111     if (s->state == TCP_CHARDEV_STATE_CONNECTED) {
 112         int ret =  io_channel_send_full(s->ioc, buf, len,
 113                                         s->write_msgfds,
 114                                         s->write_msgfds_num);
 115
 116         /* free the written msgfds in any cases
 117          * other than ret < 0 && errno == EAGAIN
 118          */
 119         if (!(ret < 0 && EAGAIN == errno)
 120             && s->write_msgfds_num) {
 121             g_free(s->write_msgfds);
 122             s->write_msgfds = 0;
 123             s->write_msgfds_num = 0;
 124         }
 125
 126         if (ret < 0 && errno != EAGAIN) {
 127             if (tcp_chr_read_poll(chr) <= 0) {
 128                 /* Perform disconnect and return error. */
 129                 tcp_chr_disconnect_locked(chr);
 130             } /* else let the read handler finish it properly */
 131         }
 132
 133         return ret;
 134     } else {
 135         /* Indicate an error. */
 136         errno = EIO;
 137         return -1;
 138     }
 139 }
 140
 141 static int tcp_chr_read_poll(void *opaque)
 142 {
 143     Chardev *chr = CHARDEV(opaque);
 144     SocketChardev *s = SOCKET_CHARDEV(opaque);
 145     if (s->state != TCP_CHARDEV_STATE_CONNECTED) {
 146         return 0;
 147     }
 148     s->max_size = qemu_chr_be_can_write(chr);
 149     return s->max_size;
 150 }
 151
 152 static void tcp_chr_process_IAC_bytes(Chardev *chr,
 153                                       SocketChardev *s,
 154                                       uint8_t *buf, int *size)
 155 {
 156     /* Handle any telnet or tn3270 client's basic IAC options.
 157      * For telnet options, it satisfies char by char mode with no echo.
 158      * For tn3270 options, it satisfies binary mode with EOR.
 159      * All IAC options will be removed from the buf and the do_opt
 160      * pointer will be used to track the state of the width of the
 161      * IAC information.
 162      *
 163      * RFC854: "All TELNET commands consist of at least a two byte sequence.
 164      * The commands dealing with option negotiation are three byte sequences,
 165      * the third byte being the code for the option referenced."
 166      * "IAC BREAK", "IAC IP", "IAC NOP" and the double IAC are two bytes.
 167      * "IAC SB", "IAC SE" and "IAC EOR" are saved to split up data boundary
 168      * for tn3270.
 169      * NOP, Break and Interrupt Process(IP) might be encountered during a TN3270
 170      * session, and NOP and IP need to be done later.
 171      */
 172
 173     int i;
 174     int j = 0;
 175
 176     for (i = 0; i < *size; i++) {
 177         if (s->do_telnetopt > 1) {
 178             if ((unsigned char)buf[i] == IAC && s->do_telnetopt == 2) {
 179                 /* Double IAC means send an IAC */
 180                 if (j != i) {
 181                     buf[j] = buf[i];
 182                 }
 183                 j++;
 184                 s->do_telnetopt = 1;
 185             } else {
 186                 if ((unsigned char)buf[i] == IAC_BREAK
 187                     && s->do_telnetopt == 2) {
 188                     /* Handle IAC break commands by sending a serial break */
 189                     qemu_chr_be_event(chr, CHR_EVENT_BREAK);
 190                     s->do_telnetopt++;
 191                 } else if (s->is_tn3270 && ((unsigned char)buf[i] == IAC_EOR
 192                            || (unsigned char)buf[i] == IAC_SB
 193                            || (unsigned char)buf[i] == IAC_SE)
 194                            && s->do_telnetopt == 2) {
 195                     buf[j++] = IAC;
 196                     buf[j++] = buf[i];
 197                     s->do_telnetopt++;
 198                 } else if (s->is_tn3270 && ((unsigned char)buf[i] == IAC_IP
 199                            || (unsigned char)buf[i] == IAC_NOP)
 200                            && s->do_telnetopt == 2) {
 201                     /* TODO: IP and NOP need to be implemented later. */
 202                     s->do_telnetopt++;
 203                 }
 204                 s->do_telnetopt++;
 205             }
 206             if (s->do_telnetopt >= 4) {
 207                 s->do_telnetopt = 1;
 208             }
 209         } else {
 210             if ((unsigned char)buf[i] == IAC) {
 211                 s->do_telnetopt = 2;
 212             } else {
 213                 if (j != i) {
 214                     buf[j] = buf[i];
 215                 }
 216                 j++;
 217             }
 218         }
 219     }
 220     *size = j;
 221 }
 222
 223 static int tcp_get_msgfds(Chardev *chr, int *fds, int num)
 224 {
 225     SocketChardev *s = SOCKET_CHARDEV(chr);
 226
 227     int to_copy = (s->read_msgfds_num < num) ? s->read_msgfds_num : num;
 228
 229     assert(num <= TCP_MAX_FDS);
 230
 231     if (to_copy) {
 232         int i;
 233
 234         memcpy(fds, s->read_msgfds, to_copy * sizeof(int));
 235
 236         /* Close unused fds */
 237         for (i = to_copy; i < s->read_msgfds_num; i++) {
 238             close(s->read_msgfds[i]);
 239         }
 240
 241         g_free(s->read_msgfds);
 242         s->read_msgfds = 0;
 243         s->read_msgfds_num = 0;
 244     }
 245
 246     return to_copy;
 247 }
 248
 249 static int tcp_set_msgfds(Chardev *chr, int *fds, int num)
 250 {
 251     SocketChardev *s = SOCKET_CHARDEV(chr);
 252
 253     /* clear old pending fd array */
 254     g_free(s->write_msgfds);
 255     s->write_msgfds = NULL;
 256     s->write_msgfds_num = 0;
 257
 258     if ((s->state != TCP_CHARDEV_STATE_CONNECTED) ||
 259         !qio_channel_has_feature(s->ioc,
 260                                  QIO_CHANNEL_FEATURE_FD_PASS)) {
 261         return -1;
 262     }
 263
 264     if (num) {
 265         s->write_msgfds = g_new(int, num);
 266         memcpy(s->write_msgfds, fds, num * sizeof(int));
 267     }
 268
 269     s->write_msgfds_num = num;
 270
 271     return 0;
 272 }
 273
 274 static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
 275 {
 276     SocketChardev *s = SOCKET_CHARDEV(chr);
 277     struct iovec iov = { .iov_base = buf, .iov_len = len };
 278     int ret;
 279     size_t i;
 280     int *msgfds = NULL;
 281     size_t msgfds_num = 0;
 282
 283     if (qio_channel_has_feature(s->ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
 284         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 285                                      &msgfds, &msgfds_num,
 286                                      NULL);
 287     } else {
 288         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 289                                      NULL, NULL,
 290                                      NULL);
 291     }
 292
 293     if (msgfds_num) {
 294         /* close and clean read_msgfds */
 295         for (i = 0; i < s->read_msgfds_num; i++) {
 296             close(s->read_msgfds[i]);
 297         }
 298
 299         if (s->read_msgfds_num) {
 300             g_free(s->read_msgfds);
 301         }
 302
 303         s->read_msgfds = msgfds;
 304         s->read_msgfds_num = msgfds_num;
 305     }
 306
 307     for (i = 0; i < s->read_msgfds_num; i++) {
 308         int fd = s->read_msgfds[i];
 309         if (fd < 0) {
 310             continue;
 311         }
 312
 313         /* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
 314         qemu_socket_set_block(fd);
 315
 316 #ifndef MSG_CMSG_CLOEXEC
 317         qemu_set_cloexec(fd);
 318 #endif
 319     }
 320
 321     if (ret == QIO_CHANNEL_ERR_BLOCK) {
 322         errno = EAGAIN;
 323         ret = -1;
 324     } else if (ret == -1) {
 325         errno = EIO;
 326     }
 327
 328     return ret;
 329 }
 330
 331 static GSource *tcp_chr_add_watch(Chardev *chr, GIOCondition cond)
 332 {
 333     SocketChardev *s = SOCKET_CHARDEV(chr);
 334     if (!s->ioc) {
 335         return NULL;
 336     }
 337     return qio_channel_create_watch(s->ioc, cond);
 338 }
 339
 340 static void remove_hup_source(SocketChardev *s)
 341 {
 342     if (s->hup_source != NULL) {
 343         g_source_destroy(s->hup_source);
 344         g_source_unref(s->hup_source);
 345         s->hup_source = NULL;
 346     }
 347 }
 348
 349 static void char_socket_yank_iochannel(void *opaque)
 350 {
 351     QIOChannel *ioc = QIO_CHANNEL(opaque);
 352
 353     qio_channel_shutdown(ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
 354 }
 355
 356 static void tcp_chr_free_connection(Chardev *chr)
 357 {
 358     SocketChardev *s = SOCKET_CHARDEV(chr);
 359     int i;
 360
 361     if (s->read_msgfds_num) {
 362         for (i = 0; i < s->read_msgfds_num; i++) {
 363             close(s->read_msgfds[i]);
 364         }
 365         g_free(s->read_msgfds);
 366         s->read_msgfds = NULL;
 367         s->read_msgfds_num = 0;
 368     }
 369
 370     remove_hup_source(s);
 371
 372     tcp_set_msgfds(chr, NULL, 0);
 373     remove_fd_in_watch(chr);
 374     if (s->registered_yank &&
 375         (s->state == TCP_CHARDEV_STATE_CONNECTING
 376         || s->state == TCP_CHARDEV_STATE_CONNECTED)) {
 377         yank_unregister_function(CHARDEV_YANK_INSTANCE(chr->label),
 378                                  char_socket_yank_iochannel,
 379                                  QIO_CHANNEL(s->sioc));
 380     }
 381     object_unref(OBJECT(s->sioc));
 382     s->sioc = NULL;
 383     object_unref(OBJECT(s->ioc));
 384     s->ioc = NULL;
 385     g_free(chr->filename);
 386     chr->filename = NULL;
 387     tcp_chr_change_state(s, TCP_CHARDEV_STATE_DISCONNECTED);
 388 }
 389
 390 static const char *qemu_chr_socket_protocol(SocketChardev *s)
 391 {
 392     if (s->is_telnet) {
 393         return "telnet";
 394     }
 395     return s->is_websock ? "websocket" : "tcp";
 396 }
 397
 398 static char *qemu_chr_socket_address(SocketChardev *s, const char *prefix)
 399 {
 400     switch (s->addr->type) {
 401     case SOCKET_ADDRESS_TYPE_INET:
 402         return g_strdup_printf("%s%s:%s:%s%s", prefix,
 403                                qemu_chr_socket_protocol(s),
 404                                s->addr->u.inet.host,
 405                                s->addr->u.inet.port,
 406                                s->is_listen ? ",server=on" : "");
 407         break;
 408     case SOCKET_ADDRESS_TYPE_UNIX:
 409     {
 410         const char *tight = "", *abstract = "";
 411         UnixSocketAddress *sa = &s->addr->u.q_unix;
 412
 413 #ifdef CONFIG_LINUX
 414         if (sa->has_abstract && sa->abstract) {
 415             abstract = ",abstract=on";
 416             if (sa->has_tight && sa->tight) {
 417                 tight = ",tight=on";
 418             }
 419         }
 420 #endif
 421
 422         return g_strdup_printf("%sunix:%s%s%s%s", prefix, sa->path,
 423                                abstract, tight,
 424                                s->is_listen ? ",server=on" : "");
 425         break;
 426     }
 427     case SOCKET_ADDRESS_TYPE_FD:
 428         return g_strdup_printf("%sfd:%s%s", prefix, s->addr->u.fd.str,
 429                                s->is_listen ? ",server=on" : "");
 430         break;
 431     case SOCKET_ADDRESS_TYPE_VSOCK:
 432         return g_strdup_printf("%svsock:%s:%s", prefix,
 433                                s->addr->u.vsock.cid,
 434                                s->addr->u.vsock.port);
 435     default:
 436         abort();
 437     }
 438 }
 439
 440 static void update_disconnected_filename(SocketChardev *s)
 441 {
 442     Chardev *chr = CHARDEV(s);
 443
 444     g_free(chr->filename);
 445     if (s->addr) {
 446         chr->filename = qemu_chr_socket_address(s, "disconnected:");
 447     } else {
 448         chr->filename = g_strdup("disconnected:socket");
 449     }
 450 }
 451
 452 /* NB may be called even if tcp_chr_connect has not been
 453  * reached, due to TLS or telnet initialization failure,
 454  * so can *not* assume s->state == TCP_CHARDEV_STATE_CONNECTED
 455  * This must be called with chr->chr_write_lock held.
 456  */
 457 static void tcp_chr_disconnect_locked(Chardev *chr)
 458 {
 459     SocketChardev *s = SOCKET_CHARDEV(chr);
 460     bool emit_close = s->state == TCP_CHARDEV_STATE_CONNECTED;
 461
 462     tcp_chr_free_connection(chr);
 463
 464     if (s->listener) {
 465         qio_net_listener_set_client_func_full(s->listener, tcp_chr_accept,
 466                                               chr, NULL, chr->gcontext);
 467     }
 468     update_disconnected_filename(s);
 469     if (emit_close) {
 470         qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 471     }
 472     if (s->reconnect_time && !s->reconnect_timer) {
 473         qemu_chr_socket_restart_timer(chr);
 474     }
 475 }
 476
 477 static void tcp_chr_disconnect(Chardev *chr)
 478 {
 479     qemu_mutex_lock(&chr->chr_write_lock);
 480     tcp_chr_disconnect_locked(chr);
 481     qemu_mutex_unlock(&chr->chr_write_lock);
 482 }
 483
 484 static gboolean tcp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
 485 {
 486     Chardev *chr = CHARDEV(opaque);
 487     SocketChardev *s = SOCKET_CHARDEV(opaque);
 488     uint8_t buf[CHR_READ_BUF_LEN];
 489     int len, size;
 490
 491     if ((s->state != TCP_CHARDEV_STATE_CONNECTED) ||
 492         s->max_size <= 0) {
 493         return TRUE;
 494     }
 495     len = sizeof(buf);
 496     if (len > s->max_size) {
 497         len = s->max_size;
 498     }
 499     size = tcp_chr_recv(chr, (void *)buf, len);
 500     if (size == 0 || (size == -1 && errno != EAGAIN)) {
 501         /* connection closed */
 502         tcp_chr_disconnect(chr);
 503     } else if (size > 0) {
 504         if (s->do_telnetopt) {
 505             tcp_chr_process_IAC_bytes(chr, s, buf, &size);
 506         }
 507         if (size > 0) {
 508             qemu_chr_be_write(chr, buf, size);
 509         }
 510     }
 511
 512     return TRUE;
 513 }
 514
 515 static gboolean tcp_chr_hup(QIOChannel *channel,
 516                                GIOCondition cond,
 517                                void *opaque)
 518 {
 519     Chardev *chr = CHARDEV(opaque);
 520     tcp_chr_disconnect(chr);
 521     return G_SOURCE_REMOVE;
 522 }
 523
 524 static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len)
 525 {
 526     SocketChardev *s = SOCKET_CHARDEV(chr);
 527     int size;
 528     int saved_errno;
 529
 530     if (s->state != TCP_CHARDEV_STATE_CONNECTED) {
 531         return 0;
 532     }
 533
 534     qio_channel_set_blocking(s->ioc, true, NULL);
 535     size = tcp_chr_recv(chr, (void *) buf, len);
 536     saved_errno = errno;
 537     if (s->state != TCP_CHARDEV_STATE_DISCONNECTED) {
 538         qio_channel_set_blocking(s->ioc, false, NULL);
 539     }
 540     if (size == 0) {
 541         /* connection closed */
 542         tcp_chr_disconnect(chr);
 543     }
 544
 545     errno = saved_errno;
 546     return size;
 547 }
 548
 549 static char *qemu_chr_compute_filename(SocketChardev *s)
 550 {
 551     struct sockaddr_storage *ss = &s->sioc->localAddr;
 552     struct sockaddr_storage *ps = &s->sioc->remoteAddr;
 553     socklen_t ss_len = s->sioc->localAddrLen;
 554     socklen_t ps_len = s->sioc->remoteAddrLen;
 555     char shost[NI_MAXHOST], sserv[NI_MAXSERV];
 556     char phost[NI_MAXHOST], pserv[NI_MAXSERV];
 557     const char *left = "", *right = "";
 558
 559     switch (ss->ss_family) {
 560     case AF_UNIX:
 561         return g_strdup_printf("unix:%s%s",
 562                                ((struct sockaddr_un *)(ss))->sun_path,
 563                                s->is_listen ? ",server=on" : "");
 564     case AF_INET6:
 565         left  = "[";
 566         right = "]";
 567         /* fall through */
 568     case AF_INET:
 569         getnameinfo((struct sockaddr *) ss, ss_len, shost, sizeof(shost),
 570                     sserv, sizeof(sserv), NI_NUMERICHOST | NI_NUMERICSERV);
 571         getnameinfo((struct sockaddr *) ps, ps_len, phost, sizeof(phost),
 572                     pserv, sizeof(pserv), NI_NUMERICHOST | NI_NUMERICSERV);
 573         return g_strdup_printf("%s:%s%s%s:%s%s <-> %s%s%s:%s",
 574                                qemu_chr_socket_protocol(s),
 575                                left, shost, right, sserv,
 576                                s->is_listen ? ",server=on" : "",
 577                                left, phost, right, pserv);
 578
 579     default:
 580         return g_strdup_printf("unknown");
 581     }
 582 }
 583
 584 static void update_ioc_handlers(SocketChardev *s)
 585 {
 586     Chardev *chr = CHARDEV(s);
 587
 588     if (s->state != TCP_CHARDEV_STATE_CONNECTED) {
 589         return;
 590     }
 591
 592     remove_fd_in_watch(chr);
 593     chr->gsource = io_add_watch_poll(chr, s->ioc,
 594                                      tcp_chr_read_poll,
 595                                      tcp_chr_read, chr,
 596                                      chr->gcontext);
 597
 598     remove_hup_source(s);
 599     s->hup_source = qio_channel_create_watch(s->ioc, G_IO_HUP);
 600     g_source_set_callback(s->hup_source, (GSourceFunc)tcp_chr_hup,
 601                           chr, NULL);
 602     g_source_attach(s->hup_source, chr->gcontext);
 603 }
 604
 605 static void tcp_chr_connect(void *opaque)
 606 {
 607     Chardev *chr = CHARDEV(opaque);
 608     SocketChardev *s = SOCKET_CHARDEV(opaque);
 609
 610     g_free(chr->filename);
 611     chr->filename = qemu_chr_compute_filename(s);
 612
 613     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTED);
 614     update_ioc_handlers(s);
 615     qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 616 }
 617
 618 static void tcp_chr_telnet_destroy(SocketChardev *s)
 619 {
 620     if (s->telnet_source) {
 621         g_source_destroy(s->telnet_source);
 622         g_source_unref(s->telnet_source);
 623         s->telnet_source = NULL;
 624     }
 625 }
 626
 627 static void tcp_chr_update_read_handler(Chardev *chr)
 628 {
 629     SocketChardev *s = SOCKET_CHARDEV(chr);
 630
 631     if (s->listener && s->state == TCP_CHARDEV_STATE_DISCONNECTED) {
 632         /*
 633          * It's possible that chardev context is changed in
 634          * qemu_chr_be_update_read_handlers().  Reset it for QIO net
 635          * listener if there is.
 636          */
 637         qio_net_listener_set_client_func_full(s->listener, tcp_chr_accept,
 638                                               chr, NULL, chr->gcontext);
 639     }
 640
 641     if (s->telnet_source) {
 642         tcp_chr_telnet_init(CHARDEV(s));
 643     }
 644
 645     update_ioc_handlers(s);
 646 }
 647
 648 static gboolean tcp_chr_telnet_init_io(QIOChannel *ioc,
 649                                        GIOCondition cond G_GNUC_UNUSED,
 650                                        gpointer user_data)
 651 {
 652     SocketChardev *s = user_data;
 653     Chardev *chr = CHARDEV(s);
 654     TCPChardevTelnetInit *init = s->telnet_init;
 655     ssize_t ret;
 656
 657     assert(init);
 658
 659     ret = qio_channel_write(ioc, init->buf, init->buflen, NULL);
 660     if (ret < 0) {
 661         if (ret == QIO_CHANNEL_ERR_BLOCK) {
 662             ret = 0;
 663         } else {
 664             tcp_chr_disconnect(chr);
 665             goto end;
 666         }
 667     }
 668     init->buflen -= ret;
 669
 670     if (init->buflen == 0) {
 671         tcp_chr_connect(chr);
 672         goto end;
 673     }
 674
 675     memmove(init->buf, init->buf + ret, init->buflen);
 676
 677     return G_SOURCE_CONTINUE;
 678
 679 end:
 680     g_free(s->telnet_init);
 681     s->telnet_init = NULL;
 682     g_source_unref(s->telnet_source);
 683     s->telnet_source = NULL;
 684     return G_SOURCE_REMOVE;
 685 }
 686
 687 static void tcp_chr_telnet_init(Chardev *chr)
 688 {
 689     SocketChardev *s = SOCKET_CHARDEV(chr);
 690     TCPChardevTelnetInit *init;
 691     size_t n = 0;
 692
 693     /* Destroy existing task */
 694     tcp_chr_telnet_destroy(s);
 695
 696     if (s->telnet_init) {
 697         /* We are possibly during a handshake already */
 698         goto cont;
 699     }
 700
 701     s->telnet_init = g_new0(TCPChardevTelnetInit, 1);
 702     init = s->telnet_init;
 703
 704 #define IACSET(x, a, b, c)                      \
 705     do {                                        \
 706         x[n++] = a;                             \
 707         x[n++] = b;                             \
 708         x[n++] = c;                             \
 709     } while (0)
 710
 711     if (!s->is_tn3270) {
 712         init->buflen = 12;
 713         /* Prep the telnet negotion to put telnet in binary,
 714          * no echo, single char mode */
 715         IACSET(init->buf, 0xff, 0xfb, 0x01);  /* IAC WILL ECHO */
 716         IACSET(init->buf, 0xff, 0xfb, 0x03);  /* IAC WILL Suppress go ahead */
 717         IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL Binary */
 718         IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO Binary */
 719     } else {
 720         init->buflen = 21;
 721         /* Prep the TN3270 negotion based on RFC1576 */
 722         IACSET(init->buf, 0xff, 0xfd, 0x19);  /* IAC DO EOR */
 723         IACSET(init->buf, 0xff, 0xfb, 0x19);  /* IAC WILL EOR */
 724         IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO BINARY */
 725         IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL BINARY */
 726         IACSET(init->buf, 0xff, 0xfd, 0x18);  /* IAC DO TERMINAL TYPE */
 727         IACSET(init->buf, 0xff, 0xfa, 0x18);  /* IAC SB TERMINAL TYPE */
 728         IACSET(init->buf, 0x01, 0xff, 0xf0);  /* SEND IAC SE */
 729     }
 730
 731 #undef IACSET
 732
 733 cont:
 734     s->telnet_source = qio_channel_add_watch_source(s->ioc, G_IO_OUT,
 735                                                     tcp_chr_telnet_init_io,
 736                                                     s, NULL,
 737                                                     chr->gcontext);
 738 }
 739
 740
 741 static void tcp_chr_websock_handshake(QIOTask *task, gpointer user_data)
 742 {
 743     Chardev *chr = user_data;
 744     SocketChardev *s = user_data;
 745
 746     if (qio_task_propagate_error(task, NULL)) {
 747         tcp_chr_disconnect(chr);
 748     } else {
 749         if (s->do_telnetopt) {
 750             tcp_chr_telnet_init(chr);
 751         } else {
 752             tcp_chr_connect(chr);
 753         }
 754     }
 755 }
 756
 757
 758 static void tcp_chr_websock_init(Chardev *chr)
 759 {
 760     SocketChardev *s = SOCKET_CHARDEV(chr);
 761     QIOChannelWebsock *wioc = NULL;
 762     gchar *name;
 763
 764     wioc = qio_channel_websock_new_server(s->ioc);
 765
 766     name = g_strdup_printf("chardev-websocket-server-%s", chr->label);
 767     qio_channel_set_name(QIO_CHANNEL(wioc), name);
 768     g_free(name);
 769     object_unref(OBJECT(s->ioc));
 770     s->ioc = QIO_CHANNEL(wioc);
 771
 772     qio_channel_websock_handshake(wioc, tcp_chr_websock_handshake, chr, NULL);
 773 }
 774
 775
 776 static void tcp_chr_tls_handshake(QIOTask *task,
 777                                   gpointer user_data)
 778 {
 779     Chardev *chr = user_data;
 780     SocketChardev *s = user_data;
 781
 782     if (qio_task_propagate_error(task, NULL)) {
 783         tcp_chr_disconnect(chr);
 784     } else {
 785         if (s->is_websock) {
 786             tcp_chr_websock_init(chr);
 787         } else if (s->do_telnetopt) {
 788             tcp_chr_telnet_init(chr);
 789         } else {
 790             tcp_chr_connect(chr);
 791         }
 792     }
 793 }
 794
 795
 796 static void tcp_chr_tls_init(Chardev *chr)
 797 {
 798     SocketChardev *s = SOCKET_CHARDEV(chr);
 799     QIOChannelTLS *tioc;
 800     gchar *name;
 801
 802     if (s->is_listen) {
 803         tioc = qio_channel_tls_new_server(
 804             s->ioc, s->tls_creds,
 805             s->tls_authz,
 806             NULL);
 807     } else {
 808         tioc = qio_channel_tls_new_client(
 809             s->ioc, s->tls_creds,
 810             s->addr->u.inet.host,
 811             NULL);
 812     }
 813     if (tioc == NULL) {
 814         tcp_chr_disconnect(chr);
 815         return;
 816     }
 817     name = g_strdup_printf("chardev-tls-%s-%s",
 818                            s->is_listen ? "server" : "client",
 819                            chr->label);
 820     qio_channel_set_name(QIO_CHANNEL(tioc), name);
 821     g_free(name);
 822     object_unref(OBJECT(s->ioc));
 823     s->ioc = QIO_CHANNEL(tioc);
 824
 825     qio_channel_tls_handshake(tioc,
 826                               tcp_chr_tls_handshake,
 827                               chr,
 828                               NULL,
 829                               chr->gcontext);
 830 }
 831
 832
 833 static void tcp_chr_set_client_ioc_name(Chardev *chr,
 834                                         QIOChannelSocket *sioc)
 835 {
 836     SocketChardev *s = SOCKET_CHARDEV(chr);
 837     char *name;
 838     name = g_strdup_printf("chardev-tcp-%s-%s",
 839                            s->is_listen ? "server" : "client",
 840                            chr->label);
 841     qio_channel_set_name(QIO_CHANNEL(sioc), name);
 842     g_free(name);
 843
 844 }
 845
 846 static int tcp_chr_new_client(Chardev *chr, QIOChannelSocket *sioc)
 847 {
 848     SocketChardev *s = SOCKET_CHARDEV(chr);
 849
 850     if (s->state != TCP_CHARDEV_STATE_CONNECTING) {
 851         return -1;
 852     }
 853
 854     s->ioc = QIO_CHANNEL(sioc);
 855     object_ref(OBJECT(sioc));
 856     s->sioc = sioc;
 857     object_ref(OBJECT(sioc));
 858
 859     qio_channel_set_blocking(s->ioc, false, NULL);
 860
 861     if (s->do_nodelay) {
 862         qio_channel_set_delay(s->ioc, false);
 863     }
 864     if (s->listener) {
 865         qio_net_listener_set_client_func_full(s->listener, NULL, NULL,
 866                                               NULL, chr->gcontext);
 867     }
 868
 869     if (s->tls_creds) {
 870         tcp_chr_tls_init(chr);
 871     } else if (s->is_websock) {
 872         tcp_chr_websock_init(chr);
 873     } else if (s->do_telnetopt) {
 874         tcp_chr_telnet_init(chr);
 875     } else {
 876         tcp_chr_connect(chr);
 877     }
 878
 879     return 0;
 880 }
 881
 882
 883 static int tcp_chr_add_client(Chardev *chr, int fd)
 884 {
 885     int ret;
 886     QIOChannelSocket *sioc;
 887     SocketChardev *s = SOCKET_CHARDEV(chr);
 888
 889     if (s->state != TCP_CHARDEV_STATE_DISCONNECTED) {
 890         return -1;
 891     }
 892
 893     sioc = qio_channel_socket_new_fd(fd, NULL);
 894     if (!sioc) {
 895         return -1;
 896     }
 897     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 898     tcp_chr_set_client_ioc_name(chr, sioc);
 899     if (s->registered_yank) {
 900         yank_register_function(CHARDEV_YANK_INSTANCE(chr->label),
 901                                char_socket_yank_iochannel,
 902                                QIO_CHANNEL(sioc));
 903     }
 904     ret = tcp_chr_new_client(chr, sioc);
 905     object_unref(OBJECT(sioc));
 906     return ret;
 907 }
 908
 909 static void tcp_chr_accept(QIONetListener *listener,
 910                            QIOChannelSocket *cioc,
 911                            void *opaque)
 912 {
 913     Chardev *chr = CHARDEV(opaque);
 914     SocketChardev *s = SOCKET_CHARDEV(chr);
 915
 916     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 917     tcp_chr_set_client_ioc_name(chr, cioc);
 918     if (s->registered_yank) {
 919         yank_register_function(CHARDEV_YANK_INSTANCE(chr->label),
 920                                char_socket_yank_iochannel,
 921                                QIO_CHANNEL(cioc));
 922     }
 923     tcp_chr_new_client(chr, cioc);
 924 }
 925
 926
 927 static int tcp_chr_connect_client_sync(Chardev *chr, Error **errp)
 928 {
 929     SocketChardev *s = SOCKET_CHARDEV(chr);
 930     QIOChannelSocket *sioc = qio_channel_socket_new();
 931     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 932     tcp_chr_set_client_ioc_name(chr, sioc);
 933     if (qio_channel_socket_connect_sync(sioc, s->addr, errp) < 0) {
 934         tcp_chr_change_state(s, TCP_CHARDEV_STATE_DISCONNECTED);
 935         object_unref(OBJECT(sioc));
 936         return -1;
 937     }
 938     if (s->registered_yank) {
 939         yank_register_function(CHARDEV_YANK_INSTANCE(chr->label),
 940                                char_socket_yank_iochannel,
 941                                QIO_CHANNEL(sioc));
 942     }
 943     tcp_chr_new_client(chr, sioc);
 944     object_unref(OBJECT(sioc));
 945     return 0;
 946 }
 947
 948
 949 static void tcp_chr_accept_server_sync(Chardev *chr)
 950 {
 951     SocketChardev *s = SOCKET_CHARDEV(chr);
 952     QIOChannelSocket *sioc;
 953     info_report("QEMU waiting for connection on: %s",
 954                 chr->filename);
 955     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
 956     sioc = qio_net_listener_wait_client(s->listener);
 957     tcp_chr_set_client_ioc_name(chr, sioc);
 958     if (s->registered_yank) {
 959         yank_register_function(CHARDEV_YANK_INSTANCE(chr->label),
 960                                char_socket_yank_iochannel,
 961                                QIO_CHANNEL(sioc));
 962     }
 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     if (s->registered_yank) {
1074         /*
1075          * In the chardev-change special-case, we shouldn't unregister the yank
1076          * instance, as it still may be needed.
1077          */
1078         if (!chr->handover_yank_instance) {
1079             yank_unregister_instance(CHARDEV_YANK_INSTANCE(chr->label));
1080         }
1081     }
1082
1083     qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
1084 }
1085
1086 static void qemu_chr_socket_connected(QIOTask *task, void *opaque)
1087 {
1088     QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
1089     Chardev *chr = CHARDEV(opaque);
1090     SocketChardev *s = SOCKET_CHARDEV(chr);
1091     Error *err = NULL;
1092
1093     s->connect_task = NULL;
1094
1095     if (qio_task_propagate_error(task, &err)) {
1096         tcp_chr_change_state(s, TCP_CHARDEV_STATE_DISCONNECTED);
1097         if (s->registered_yank) {
1098             yank_unregister_function(CHARDEV_YANK_INSTANCE(chr->label),
1099                                      char_socket_yank_iochannel,
1100                                      QIO_CHANNEL(sioc));
1101         }
1102         check_report_connect_error(chr, err);
1103         goto cleanup;
1104     }
1105
1106     s->connect_err_reported = false;
1107     tcp_chr_new_client(chr, sioc);
1108
1109 cleanup:
1110     object_unref(OBJECT(sioc));
1111 }
1112
1113
1114 static void tcp_chr_connect_client_task(QIOTask *task,
1115                                         gpointer opaque)
1116 {
1117     QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
1118     SocketAddress *addr = opaque;
1119     Error *err = NULL;
1120
1121     qio_channel_socket_connect_sync(ioc, addr, &err);
1122
1123     qio_task_set_error(task, err);
1124 }
1125
1126
1127 static void tcp_chr_connect_client_async(Chardev *chr)
1128 {
1129     SocketChardev *s = SOCKET_CHARDEV(chr);
1130     QIOChannelSocket *sioc;
1131
1132     tcp_chr_change_state(s, TCP_CHARDEV_STATE_CONNECTING);
1133     sioc = qio_channel_socket_new();
1134     tcp_chr_set_client_ioc_name(chr, sioc);
1135     if (s->registered_yank) {
1136         yank_register_function(CHARDEV_YANK_INSTANCE(chr->label),
1137                                char_socket_yank_iochannel,
1138                                QIO_CHANNEL(sioc));
1139     }
1140     /*
1141      * Normally code would use the qio_channel_socket_connect_async
1142      * method which uses a QIOTask + qio_task_set_error internally
1143      * to avoid blocking. The tcp_chr_wait_connected method, however,
1144      * needs a way to synchronize with completion of the background
1145      * connect task which can't be done with the QIOChannelSocket
1146      * async APIs. Thus we must use QIOTask directly to implement
1147      * the non-blocking concept locally.
1148      */
1149     s->connect_task = qio_task_new(OBJECT(sioc),
1150                                    qemu_chr_socket_connected,
1151                                    object_ref(OBJECT(chr)),
1152                                    (GDestroyNotify)object_unref);
1153     qio_task_run_in_thread(s->connect_task,
1154                            tcp_chr_connect_client_task,
1155                            s->addr,
1156                            NULL,
1157                            chr->gcontext);
1158 }
1159
1160 static gboolean socket_reconnect_timeout(gpointer opaque)
1161 {
1162     Chardev *chr = CHARDEV(opaque);
1163     SocketChardev *s = SOCKET_CHARDEV(opaque);
1164
1165     qemu_mutex_lock(&chr->chr_write_lock);
1166     g_source_unref(s->reconnect_timer);
1167     s->reconnect_timer = NULL;
1168     qemu_mutex_unlock(&chr->chr_write_lock);
1169
1170     if (chr->be_open) {
1171         return false;
1172     }
1173
1174     tcp_chr_connect_client_async(chr);
1175
1176     return false;
1177 }
1178
1179
1180 static int qmp_chardev_open_socket_server(Chardev *chr,
1181                                           bool is_telnet,
1182                                           bool is_waitconnect,
1183                                           Error **errp)
1184 {
1185     SocketChardev *s = SOCKET_CHARDEV(chr);
1186     char *name;
1187     if (is_telnet) {
1188         s->do_telnetopt = 1;
1189     }
1190     s->listener = qio_net_listener_new();
1191
1192     name = g_strdup_printf("chardev-tcp-listener-%s", chr->label);
1193     qio_net_listener_set_name(s->listener, name);
1194     g_free(name);
1195
1196     if (s->addr->type == SOCKET_ADDRESS_TYPE_FD && !*s->addr->u.fd.str) {
1197         goto skip_listen;
1198     }
1199
1200     if (qio_net_listener_open_sync(s->listener, s->addr, 1, errp) < 0) {
1201         object_unref(OBJECT(s->listener));
1202         s->listener = NULL;
1203         return -1;
1204     }
1205
1206     qapi_free_SocketAddress(s->addr);
1207     s->addr = socket_local_address(s->listener->sioc[0]->fd, errp);
1208
1209 skip_listen:
1210     update_disconnected_filename(s);
1211
1212     if (is_waitconnect) {
1213         tcp_chr_accept_server_sync(chr);
1214     } else {
1215         qio_net_listener_set_client_func_full(s->listener,
1216                                               tcp_chr_accept,
1217                                               chr, NULL,
1218                                               chr->gcontext);
1219     }
1220
1221     return 0;
1222 }
1223
1224
1225 static int qmp_chardev_open_socket_client(Chardev *chr,
1226                                           int64_t reconnect,
1227                                           Error **errp)
1228 {
1229     SocketChardev *s = SOCKET_CHARDEV(chr);
1230
1231     if (reconnect > 0) {
1232         s->reconnect_time = reconnect;
1233         tcp_chr_connect_client_async(chr);
1234         return 0;
1235     } else {
1236         return tcp_chr_connect_client_sync(chr, errp);
1237     }
1238 }
1239
1240
1241 static bool qmp_chardev_validate_socket(ChardevSocket *sock,
1242                                         SocketAddress *addr,
1243                                         Error **errp)
1244 {
1245     /* Validate any options which have a dependency on address type */
1246     switch (addr->type) {
1247     case SOCKET_ADDRESS_TYPE_FD:
1248         if (sock->has_reconnect) {
1249             error_setg(errp,
1250                        "'reconnect' option is incompatible with "
1251                        "'fd' address type");
1252             return false;
1253         }
1254         if (sock->has_tls_creds &&
1255             !(sock->has_server && sock->server)) {
1256             error_setg(errp,
1257                        "'tls_creds' option is incompatible with "
1258                        "'fd' address type as client");
1259             return false;
1260         }
1261         break;
1262
1263     case SOCKET_ADDRESS_TYPE_UNIX:
1264         if (sock->has_tls_creds) {
1265             error_setg(errp,
1266                        "'tls_creds' option is incompatible with "
1267                        "'unix' address type");
1268             return false;
1269         }
1270         break;
1271
1272     case SOCKET_ADDRESS_TYPE_INET:
1273         break;
1274
1275     case SOCKET_ADDRESS_TYPE_VSOCK:
1276         if (sock->has_tls_creds) {
1277             error_setg(errp,
1278                        "'tls_creds' option is incompatible with "
1279                        "'vsock' address type");
1280             return false;
1281         }
1282
1283     default:
1284         break;
1285     }
1286
1287     if (sock->has_tls_authz && !sock->has_tls_creds) {
1288         error_setg(errp, "'tls_authz' option requires 'tls_creds' option");
1289         return false;
1290     }
1291
1292     /* Validate any options which have a dependancy on client vs server */
1293     if (!sock->has_server || sock->server) {
1294         if (sock->has_reconnect) {
1295             error_setg(errp,
1296                        "'reconnect' option is incompatible with "
1297                        "socket in server listen mode");
1298             return false;
1299         }
1300     } else {
1301         if (sock->has_websocket && sock->websocket) {
1302             error_setg(errp, "%s", "Websocket client is not implemented");
1303             return false;
1304         }
1305         if (sock->has_wait) {
1306             error_setg(errp, "%s",
1307                        "'wait' option is incompatible with "
1308                        "socket in client connect mode");
1309             return false;
1310         }
1311     }
1312
1313     return true;
1314 }
1315
1316
1317 static void qmp_chardev_open_socket(Chardev *chr,
1318                                     ChardevBackend *backend,
1319                                     bool *be_opened,
1320                                     Error **errp)
1321 {
1322     SocketChardev *s = SOCKET_CHARDEV(chr);
1323     ChardevSocket *sock = backend->u.socket.data;
1324     bool do_nodelay     = sock->has_nodelay ? sock->nodelay : false;
1325     bool is_listen      = sock->has_server  ? sock->server  : true;
1326     bool is_telnet      = sock->has_telnet  ? sock->telnet  : false;
1327     bool is_tn3270      = sock->has_tn3270  ? sock->tn3270  : false;
1328     bool is_waitconnect = sock->has_wait    ? sock->wait    : false;
1329     bool is_websock     = sock->has_websocket ? sock->websocket : false;
1330     int64_t reconnect   = sock->has_reconnect ? sock->reconnect : 0;
1331     SocketAddress *addr;
1332
1333     s->is_listen = is_listen;
1334     s->is_telnet = is_telnet;
1335     s->is_tn3270 = is_tn3270;
1336     s->is_websock = is_websock;
1337     s->do_nodelay = do_nodelay;
1338     if (sock->tls_creds) {
1339         Object *creds;
1340         creds = object_resolve_path_component(
1341             object_get_objects_root(), sock->tls_creds);
1342         if (!creds) {
1343             error_setg(errp, "No TLS credentials with id '%s'",
1344                        sock->tls_creds);
1345             return;
1346         }
1347         s->tls_creds = (QCryptoTLSCreds *)
1348             object_dynamic_cast(creds,
1349                                 TYPE_QCRYPTO_TLS_CREDS);
1350         if (!s->tls_creds) {
1351             error_setg(errp, "Object with id '%s' is not TLS credentials",
1352                        sock->tls_creds);
1353             return;
1354         }
1355         object_ref(OBJECT(s->tls_creds));
1356         if (!qcrypto_tls_creds_check_endpoint(s->tls_creds,
1357                                           is_listen
1358                                           ? QCRYPTO_TLS_CREDS_ENDPOINT_SERVER
1359                                           : QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT,
1360                                           errp)) {
1361             return;
1362         }
1363     }
1364     s->tls_authz = g_strdup(sock->tls_authz);
1365
1366     s->addr = addr = socket_address_flatten(sock->addr);
1367
1368     if (!qmp_chardev_validate_socket(sock, addr, errp)) {
1369         return;
1370     }
1371
1372     qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE);
1373 #ifndef _WIN32
1374     /* TODO SOCKET_ADDRESS_FD where fd has AF_UNIX */
1375     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
1376         qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_FD_PASS);
1377     }
1378 #endif
1379
1380     /*
1381      * In the chardev-change special-case, we shouldn't register a new yank
1382      * instance, as there already may be one.
1383      */
1384     if (!chr->handover_yank_instance) {
1385         if (!yank_register_instance(CHARDEV_YANK_INSTANCE(chr->label), errp)) {
1386             return;
1387         }
1388     }
1389     s->registered_yank = true;
1390
1391     /* be isn't opened until we get a connection */
1392     *be_opened = false;
1393
1394     update_disconnected_filename(s);
1395
1396     if (s->is_listen) {
1397         if (qmp_chardev_open_socket_server(chr, is_telnet || is_tn3270,
1398                                            is_waitconnect, errp) < 0) {
1399             return;
1400         }
1401     } else {
1402         if (qmp_chardev_open_socket_client(chr, reconnect, errp) < 0) {
1403             return;
1404         }
1405     }
1406 }
1407
1408 static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
1409                                   Error **errp)
1410 {
1411     const char *path = qemu_opt_get(opts, "path");
1412     const char *host = qemu_opt_get(opts, "host");
1413     const char *port = qemu_opt_get(opts, "port");
1414     const char *fd = qemu_opt_get(opts, "fd");
1415 #ifdef CONFIG_LINUX
1416     bool tight = qemu_opt_get_bool(opts, "tight", true);
1417     bool abstract = qemu_opt_get_bool(opts, "abstract", false);
1418 #endif
1419     SocketAddressLegacy *addr;
1420     ChardevSocket *sock;
1421
1422     if ((!!path + !!fd + !!host) > 1) {
1423         error_setg(errp,
1424                    "None or one of 'path', 'fd' or 'host' option required.");
1425         return;
1426     }
1427
1428     if (host && !port) {
1429         error_setg(errp, "chardev: socket: no port given");
1430         return;
1431     }
1432
1433     backend->type = CHARDEV_BACKEND_KIND_SOCKET;
1434     sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
1435     qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));
1436
1437     if (qemu_opt_get(opts, "delay") && qemu_opt_get(opts, "nodelay")) {
1438         error_setg(errp, "'delay' and 'nodelay' are mutually exclusive");
1439         return;
1440     }
1441     sock->has_nodelay =
1442         qemu_opt_get(opts, "delay") ||
1443         qemu_opt_get(opts, "nodelay");
1444     sock->nodelay =
1445         !qemu_opt_get_bool(opts, "delay", true) ||
1446         qemu_opt_get_bool(opts, "nodelay", false);
1447
1448     /*
1449      * We have different default to QMP for 'server', hence
1450      * we can't just check for existence of 'server'
1451      */
1452     sock->has_server = true;
1453     sock->server = qemu_opt_get_bool(opts, "server", false);
1454     sock->has_telnet = qemu_opt_get(opts, "telnet");
1455     sock->telnet = qemu_opt_get_bool(opts, "telnet", false);
1456     sock->has_tn3270 = qemu_opt_get(opts, "tn3270");
1457     sock->tn3270 = qemu_opt_get_bool(opts, "tn3270", false);
1458     sock->has_websocket = qemu_opt_get(opts, "websocket");
1459     sock->websocket = qemu_opt_get_bool(opts, "websocket", false);
1460     /*
1461      * We have different default to QMP for 'wait' when 'server'
1462      * is set, hence we can't just check for existence of 'wait'
1463      */
1464     sock->has_wait = qemu_opt_find(opts, "wait") || sock->server;
1465     sock->wait = qemu_opt_get_bool(opts, "wait", true);
1466     sock->has_reconnect = qemu_opt_find(opts, "reconnect");
1467     sock->reconnect = qemu_opt_get_number(opts, "reconnect", 0);
1468     sock->has_tls_creds = qemu_opt_get(opts, "tls-creds");
1469     sock->tls_creds = g_strdup(qemu_opt_get(opts, "tls-creds"));
1470     sock->has_tls_authz = qemu_opt_get(opts, "tls-authz");
1471     sock->tls_authz = g_strdup(qemu_opt_get(opts, "tls-authz"));
1472
1473     addr = g_new0(SocketAddressLegacy, 1);
1474     if (path) {
1475         UnixSocketAddress *q_unix;
1476         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1477         q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
1478         q_unix->path = g_strdup(path);
1479 #ifdef CONFIG_LINUX
1480         q_unix->has_tight = true;
1481         q_unix->tight = tight;
1482         q_unix->has_abstract = true;
1483         q_unix->abstract = abstract;
1484 #endif
1485     } else if (host) {
1486         addr->type = SOCKET_ADDRESS_TYPE_INET;
1487         addr->u.inet.data = g_new(InetSocketAddress, 1);
1488         *addr->u.inet.data = (InetSocketAddress) {
1489             .host = g_strdup(host),
1490             .port = g_strdup(port),
1491             .has_to = qemu_opt_get(opts, "to"),
1492             .to = qemu_opt_get_number(opts, "to", 0),
1493             .has_ipv4 = qemu_opt_get(opts, "ipv4"),
1494             .ipv4 = qemu_opt_get_bool(opts, "ipv4", 0),
1495             .has_ipv6 = qemu_opt_get(opts, "ipv6"),
1496             .ipv6 = qemu_opt_get_bool(opts, "ipv6", 0),
1497         };
1498     } else {
1499         addr->type = SOCKET_ADDRESS_TYPE_FD;
1500         addr->u.fd.data = g_new(String, 1);
1501         addr->u.fd.data->str = g_strdup(fd);
1502     }
1503     sock->addr = addr;
1504 }
1505
1506 static void
1507 char_socket_get_addr(Object *obj, Visitor *v, const char *name,
1508                      void *opaque, Error **errp)
1509 {
1510     SocketChardev *s = SOCKET_CHARDEV(obj);
1511
1512     visit_type_SocketAddress(v, name, &s->addr, errp);
1513 }
1514
1515 static bool
1516 char_socket_get_connected(Object *obj, Error **errp)
1517 {
1518     SocketChardev *s = SOCKET_CHARDEV(obj);
1519
1520     return s->state == TCP_CHARDEV_STATE_CONNECTED;
1521 }
1522
1523 static void char_socket_class_init(ObjectClass *oc, void *data)
1524 {
1525     ChardevClass *cc = CHARDEV_CLASS(oc);
1526
1527     cc->supports_yank = true;
1528
1529     cc->parse = qemu_chr_parse_socket;
1530     cc->open = qmp_chardev_open_socket;
1531     cc->chr_wait_connected = tcp_chr_wait_connected;
1532     cc->chr_write = tcp_chr_write;
1533     cc->chr_sync_read = tcp_chr_sync_read;
1534     cc->chr_disconnect = tcp_chr_disconnect;
1535     cc->get_msgfds = tcp_get_msgfds;
1536     cc->set_msgfds = tcp_set_msgfds;
1537     cc->chr_add_client = tcp_chr_add_client;
1538     cc->chr_add_watch = tcp_chr_add_watch;
1539     cc->chr_update_read_handler = tcp_chr_update_read_handler;
1540
1541     object_class_property_add(oc, "addr", "SocketAddress",
1542                               char_socket_get_addr, NULL,
1543                               NULL, NULL);
1544
1545     object_class_property_add_bool(oc, "connected", char_socket_get_connected,
1546                                    NULL);
1547 }
1548
1549 static const TypeInfo char_socket_type_info = {
1550     .name = TYPE_CHARDEV_SOCKET,
1551     .parent = TYPE_CHARDEV,
1552     .instance_size = sizeof(SocketChardev),
1553     .instance_finalize = char_socket_finalize,
1554     .class_init = char_socket_class_init,
1555 };
1556
1557 static void register_types(void)
1558 {
1559     type_register_static(&char_socket_type_info);
1560 }
1561
1562 type_init(register_types);