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/net-listener.h"
  30 #include "qemu/error-report.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
  36 #include "chardev/char-io.h"
  37
  38 /***********************************************************/
  39 /* TCP Net console */
  40
  41 #define TCP_MAX_FDS 16
  42
  43 typedef struct {
  44     Chardev parent;
  45     QIOChannel *ioc; /* Client I/O channel */
  46     QIOChannelSocket *sioc; /* Client master channel */
  47     QIONetListener *listener;
  48     GSource *hup_source;
  49     QCryptoTLSCreds *tls_creds;
  50     int connected;
  51     int max_size;
  52     int do_telnetopt;
  53     int do_nodelay;
  54     int *read_msgfds;
  55     size_t read_msgfds_num;
  56     int *write_msgfds;
  57     size_t write_msgfds_num;
  58
  59     SocketAddress *addr;
  60     bool is_listen;
  61     bool is_telnet;
  62     bool is_tn3270;
  63
  64     GSource *reconnect_timer;
  65     int64_t reconnect_time;
  66     bool connect_err_reported;
  67 } SocketChardev;
  68
  69 #define SOCKET_CHARDEV(obj)                                     \
  70     OBJECT_CHECK(SocketChardev, (obj), TYPE_CHARDEV_SOCKET)
  71
  72 static gboolean socket_reconnect_timeout(gpointer opaque);
  73
  74 static void tcp_chr_reconn_timer_cancel(SocketChardev *s)
  75 {
  76     if (s->reconnect_timer) {
  77         g_source_destroy(s->reconnect_timer);
  78         g_source_unref(s->reconnect_timer);
  79         s->reconnect_timer = NULL;
  80     }
  81 }
  82
  83 static void qemu_chr_socket_restart_timer(Chardev *chr)
  84 {
  85     SocketChardev *s = SOCKET_CHARDEV(chr);
  86     char *name;
  87
  88     assert(s->connected == 0);
  89     name = g_strdup_printf("chardev-socket-reconnect-%s", chr->label);
  90     s->reconnect_timer = qemu_chr_timeout_add_ms(chr,
  91                                                  s->reconnect_time * 1000,
  92                                                  socket_reconnect_timeout,
  93                                                  chr);
  94     g_source_set_name(s->reconnect_timer, name);
  95     g_free(name);
  96 }
  97
  98 static void check_report_connect_error(Chardev *chr,
  99                                        Error *err)
 100 {
 101     SocketChardev *s = SOCKET_CHARDEV(chr);
 102
 103     if (!s->connect_err_reported) {
 104         error_report("Unable to connect character device %s: %s",
 105                      chr->label, error_get_pretty(err));
 106         s->connect_err_reported = true;
 107     }
 108     qemu_chr_socket_restart_timer(chr);
 109 }
 110
 111 static void tcp_chr_accept(QIONetListener *listener,
 112                            QIOChannelSocket *cioc,
 113                            void *opaque);
 114
 115 static int tcp_chr_read_poll(void *opaque);
 116 static void tcp_chr_disconnect(Chardev *chr);
 117
 118 /* Called with chr_write_lock held.  */
 119 static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
 120 {
 121     SocketChardev *s = SOCKET_CHARDEV(chr);
 122
 123     if (s->connected) {
 124         int ret =  io_channel_send_full(s->ioc, buf, len,
 125                                         s->write_msgfds,
 126                                         s->write_msgfds_num);
 127
 128         /* free the written msgfds, no matter what */
 129         if (s->write_msgfds_num) {
 130             g_free(s->write_msgfds);
 131             s->write_msgfds = 0;
 132             s->write_msgfds_num = 0;
 133         }
 134
 135         if (ret < 0 && errno != EAGAIN) {
 136             if (tcp_chr_read_poll(chr) <= 0) {
 137                 tcp_chr_disconnect(chr);
 138                 return len;
 139             } /* else let the read handler finish it properly */
 140         }
 141
 142         return ret;
 143     } else {
 144         /* XXX: indicate an error ? */
 145         return len;
 146     }
 147 }
 148
 149 static int tcp_chr_read_poll(void *opaque)
 150 {
 151     Chardev *chr = CHARDEV(opaque);
 152     SocketChardev *s = SOCKET_CHARDEV(opaque);
 153     if (!s->connected) {
 154         return 0;
 155     }
 156     s->max_size = qemu_chr_be_can_write(chr);
 157     return s->max_size;
 158 }
 159
 160 static void tcp_chr_process_IAC_bytes(Chardev *chr,
 161                                       SocketChardev *s,
 162                                       uint8_t *buf, int *size)
 163 {
 164     /* Handle any telnet or tn3270 client's basic IAC options.
 165      * For telnet options, it satisfies char by char mode with no echo.
 166      * For tn3270 options, it satisfies binary mode with EOR.
 167      * All IAC options will be removed from the buf and the do_opt
 168      * pointer will be used to track the state of the width of the
 169      * IAC information.
 170      *
 171      * RFC854: "All TELNET commands consist of at least a two byte sequence.
 172      * The commands dealing with option negotiation are three byte sequences,
 173      * the third byte being the code for the option referenced."
 174      * "IAC BREAK", "IAC IP", "IAC NOP" and the double IAC are two bytes.
 175      * "IAC SB", "IAC SE" and "IAC EOR" are saved to split up data boundary
 176      * for tn3270.
 177      * NOP, Break and Interrupt Process(IP) might be encountered during a TN3270
 178      * session, and NOP and IP need to be done later.
 179      */
 180
 181     int i;
 182     int j = 0;
 183
 184     for (i = 0; i < *size; i++) {
 185         if (s->do_telnetopt > 1) {
 186             if ((unsigned char)buf[i] == IAC && s->do_telnetopt == 2) {
 187                 /* Double IAC means send an IAC */
 188                 if (j != i) {
 189                     buf[j] = buf[i];
 190                 }
 191                 j++;
 192                 s->do_telnetopt = 1;
 193             } else {
 194                 if ((unsigned char)buf[i] == IAC_BREAK
 195                     && s->do_telnetopt == 2) {
 196                     /* Handle IAC break commands by sending a serial break */
 197                     qemu_chr_be_event(chr, CHR_EVENT_BREAK);
 198                     s->do_telnetopt++;
 199                 } else if (s->is_tn3270 && ((unsigned char)buf[i] == IAC_EOR
 200                            || (unsigned char)buf[i] == IAC_SB
 201                            || (unsigned char)buf[i] == IAC_SE)
 202                            && s->do_telnetopt == 2) {
 203                     buf[j++] = IAC;
 204                     buf[j++] = buf[i];
 205                     s->do_telnetopt++;
 206                 } else if (s->is_tn3270 && ((unsigned char)buf[i] == IAC_IP
 207                            || (unsigned char)buf[i] == IAC_NOP)
 208                            && s->do_telnetopt == 2) {
 209                     /* TODO: IP and NOP need to be implemented later. */
 210                     s->do_telnetopt++;
 211                 }
 212                 s->do_telnetopt++;
 213             }
 214             if (s->do_telnetopt >= 4) {
 215                 s->do_telnetopt = 1;
 216             }
 217         } else {
 218             if ((unsigned char)buf[i] == IAC) {
 219                 s->do_telnetopt = 2;
 220             } else {
 221                 if (j != i) {
 222                     buf[j] = buf[i];
 223                 }
 224                 j++;
 225             }
 226         }
 227     }
 228     *size = j;
 229 }
 230
 231 static int tcp_get_msgfds(Chardev *chr, int *fds, int num)
 232 {
 233     SocketChardev *s = SOCKET_CHARDEV(chr);
 234
 235     int to_copy = (s->read_msgfds_num < num) ? s->read_msgfds_num : num;
 236
 237     assert(num <= TCP_MAX_FDS);
 238
 239     if (to_copy) {
 240         int i;
 241
 242         memcpy(fds, s->read_msgfds, to_copy * sizeof(int));
 243
 244         /* Close unused fds */
 245         for (i = to_copy; i < s->read_msgfds_num; i++) {
 246             close(s->read_msgfds[i]);
 247         }
 248
 249         g_free(s->read_msgfds);
 250         s->read_msgfds = 0;
 251         s->read_msgfds_num = 0;
 252     }
 253
 254     return to_copy;
 255 }
 256
 257 static int tcp_set_msgfds(Chardev *chr, int *fds, int num)
 258 {
 259     SocketChardev *s = SOCKET_CHARDEV(chr);
 260
 261     /* clear old pending fd array */
 262     g_free(s->write_msgfds);
 263     s->write_msgfds = NULL;
 264     s->write_msgfds_num = 0;
 265
 266     if (!s->connected ||
 267         !qio_channel_has_feature(s->ioc,
 268                                  QIO_CHANNEL_FEATURE_FD_PASS)) {
 269         return -1;
 270     }
 271
 272     if (num) {
 273         s->write_msgfds = g_new(int, num);
 274         memcpy(s->write_msgfds, fds, num * sizeof(int));
 275     }
 276
 277     s->write_msgfds_num = num;
 278
 279     return 0;
 280 }
 281
 282 static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
 283 {
 284     SocketChardev *s = SOCKET_CHARDEV(chr);
 285     struct iovec iov = { .iov_base = buf, .iov_len = len };
 286     int ret;
 287     size_t i;
 288     int *msgfds = NULL;
 289     size_t msgfds_num = 0;
 290
 291     if (qio_channel_has_feature(s->ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
 292         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 293                                      &msgfds, &msgfds_num,
 294                                      NULL);
 295     } else {
 296         ret = qio_channel_readv_full(s->ioc, &iov, 1,
 297                                      NULL, NULL,
 298                                      NULL);
 299     }
 300
 301     if (ret == QIO_CHANNEL_ERR_BLOCK) {
 302         errno = EAGAIN;
 303         ret = -1;
 304     } else if (ret == -1) {
 305         errno = EIO;
 306     }
 307
 308     if (msgfds_num) {
 309         /* close and clean read_msgfds */
 310         for (i = 0; i < s->read_msgfds_num; i++) {
 311             close(s->read_msgfds[i]);
 312         }
 313
 314         if (s->read_msgfds_num) {
 315             g_free(s->read_msgfds);
 316         }
 317
 318         s->read_msgfds = msgfds;
 319         s->read_msgfds_num = msgfds_num;
 320     }
 321
 322     for (i = 0; i < s->read_msgfds_num; i++) {
 323         int fd = s->read_msgfds[i];
 324         if (fd < 0) {
 325             continue;
 326         }
 327
 328         /* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
 329         qemu_set_block(fd);
 330
 331 #ifndef MSG_CMSG_CLOEXEC
 332         qemu_set_cloexec(fd);
 333 #endif
 334     }
 335
 336     return ret;
 337 }
 338
 339 static GSource *tcp_chr_add_watch(Chardev *chr, GIOCondition cond)
 340 {
 341     SocketChardev *s = SOCKET_CHARDEV(chr);
 342     return qio_channel_create_watch(s->ioc, cond);
 343 }
 344
 345 static void tcp_chr_free_connection(Chardev *chr)
 346 {
 347     SocketChardev *s = SOCKET_CHARDEV(chr);
 348     int i;
 349
 350     if (s->read_msgfds_num) {
 351         for (i = 0; i < s->read_msgfds_num; i++) {
 352             close(s->read_msgfds[i]);
 353         }
 354         g_free(s->read_msgfds);
 355         s->read_msgfds = NULL;
 356         s->read_msgfds_num = 0;
 357     }
 358
 359     if (s->hup_source != NULL) {
 360         g_source_destroy(s->hup_source);
 361         g_source_unref(s->hup_source);
 362         s->hup_source = NULL;
 363     }
 364
 365     tcp_set_msgfds(chr, NULL, 0);
 366     remove_fd_in_watch(chr);
 367     object_unref(OBJECT(s->sioc));
 368     s->sioc = NULL;
 369     object_unref(OBJECT(s->ioc));
 370     s->ioc = NULL;
 371     g_free(chr->filename);
 372     chr->filename = NULL;
 373     s->connected = 0;
 374 }
 375
 376 static char *SocketAddress_to_str(const char *prefix, SocketAddress *addr,
 377                                   bool is_listen, bool is_telnet)
 378 {
 379     switch (addr->type) {
 380     case SOCKET_ADDRESS_TYPE_INET:
 381         return g_strdup_printf("%s%s:%s:%s%s", prefix,
 382                                is_telnet ? "telnet" : "tcp",
 383                                addr->u.inet.host,
 384                                addr->u.inet.port,
 385                                is_listen ? ",server" : "");
 386         break;
 387     case SOCKET_ADDRESS_TYPE_UNIX:
 388         return g_strdup_printf("%sunix:%s%s", prefix,
 389                                addr->u.q_unix.path,
 390                                is_listen ? ",server" : "");
 391         break;
 392     case SOCKET_ADDRESS_TYPE_FD:
 393         return g_strdup_printf("%sfd:%s%s", prefix, addr->u.fd.str,
 394                                is_listen ? ",server" : "");
 395         break;
 396     case SOCKET_ADDRESS_TYPE_VSOCK:
 397         return g_strdup_printf("%svsock:%s:%s", prefix,
 398                                addr->u.vsock.cid,
 399                                addr->u.vsock.port);
 400     default:
 401         abort();
 402     }
 403 }
 404
 405 static void update_disconnected_filename(SocketChardev *s)
 406 {
 407     Chardev *chr = CHARDEV(s);
 408
 409     g_free(chr->filename);
 410     chr->filename = SocketAddress_to_str("disconnected:", s->addr,
 411                                          s->is_listen, s->is_telnet);
 412 }
 413
 414 /* NB may be called even if tcp_chr_connect has not been
 415  * reached, due to TLS or telnet initialization failure,
 416  * so can *not* assume s->connected == true
 417  */
 418 static void tcp_chr_disconnect(Chardev *chr)
 419 {
 420     SocketChardev *s = SOCKET_CHARDEV(chr);
 421     bool emit_close = s->connected;
 422
 423     tcp_chr_free_connection(chr);
 424
 425     if (s->listener) {
 426         qio_net_listener_set_client_func(s->listener, tcp_chr_accept,
 427                                          chr, NULL);
 428     }
 429     update_disconnected_filename(s);
 430     if (emit_close) {
 431         qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 432     }
 433     if (s->reconnect_time) {
 434         qemu_chr_socket_restart_timer(chr);
 435     }
 436 }
 437
 438 static gboolean tcp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
 439 {
 440     Chardev *chr = CHARDEV(opaque);
 441     SocketChardev *s = SOCKET_CHARDEV(opaque);
 442     uint8_t buf[CHR_READ_BUF_LEN];
 443     int len, size;
 444
 445     if (!s->connected || s->max_size <= 0) {
 446         return TRUE;
 447     }
 448     len = sizeof(buf);
 449     if (len > s->max_size) {
 450         len = s->max_size;
 451     }
 452     size = tcp_chr_recv(chr, (void *)buf, len);
 453     if (size == 0 || size == -1) {
 454         /* connection closed */
 455         tcp_chr_disconnect(chr);
 456     } else if (size > 0) {
 457         if (s->do_telnetopt) {
 458             tcp_chr_process_IAC_bytes(chr, s, buf, &size);
 459         }
 460         if (size > 0) {
 461             qemu_chr_be_write(chr, buf, size);
 462         }
 463     }
 464
 465     return TRUE;
 466 }
 467
 468 static gboolean tcp_chr_hup(QIOChannel *channel,
 469                                GIOCondition cond,
 470                                void *opaque)
 471 {
 472     Chardev *chr = CHARDEV(opaque);
 473     tcp_chr_disconnect(chr);
 474     return G_SOURCE_REMOVE;
 475 }
 476
 477 static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len)
 478 {
 479     SocketChardev *s = SOCKET_CHARDEV(chr);
 480     int size;
 481
 482     if (!s->connected) {
 483         return 0;
 484     }
 485
 486     qio_channel_set_blocking(s->ioc, true, NULL);
 487     size = tcp_chr_recv(chr, (void *) buf, len);
 488     qio_channel_set_blocking(s->ioc, false, NULL);
 489     if (size == 0) {
 490         /* connection closed */
 491         tcp_chr_disconnect(chr);
 492     }
 493
 494     return size;
 495 }
 496
 497 static char *sockaddr_to_str(struct sockaddr_storage *ss, socklen_t ss_len,
 498                              struct sockaddr_storage *ps, socklen_t ps_len,
 499                              bool is_listen, bool is_telnet)
 500 {
 501     char shost[NI_MAXHOST], sserv[NI_MAXSERV];
 502     char phost[NI_MAXHOST], pserv[NI_MAXSERV];
 503     const char *left = "", *right = "";
 504
 505     switch (ss->ss_family) {
 506 #ifndef _WIN32
 507     case AF_UNIX:
 508         return g_strdup_printf("unix:%s%s",
 509                                ((struct sockaddr_un *)(ss))->sun_path,
 510                                is_listen ? ",server" : "");
 511 #endif
 512     case AF_INET6:
 513         left  = "[";
 514         right = "]";
 515         /* fall through */
 516     case AF_INET:
 517         getnameinfo((struct sockaddr *) ss, ss_len, shost, sizeof(shost),
 518                     sserv, sizeof(sserv), NI_NUMERICHOST | NI_NUMERICSERV);
 519         getnameinfo((struct sockaddr *) ps, ps_len, phost, sizeof(phost),
 520                     pserv, sizeof(pserv), NI_NUMERICHOST | NI_NUMERICSERV);
 521         return g_strdup_printf("%s:%s%s%s:%s%s <-> %s%s%s:%s",
 522                                is_telnet ? "telnet" : "tcp",
 523                                left, shost, right, sserv,
 524                                is_listen ? ",server" : "",
 525                                left, phost, right, pserv);
 526
 527     default:
 528         return g_strdup_printf("unknown");
 529     }
 530 }
 531
 532 static void tcp_chr_connect(void *opaque)
 533 {
 534     Chardev *chr = CHARDEV(opaque);
 535     SocketChardev *s = SOCKET_CHARDEV(opaque);
 536
 537     g_free(chr->filename);
 538     chr->filename = sockaddr_to_str(
 539         &s->sioc->localAddr, s->sioc->localAddrLen,
 540         &s->sioc->remoteAddr, s->sioc->remoteAddrLen,
 541         s->is_listen, s->is_telnet);
 542
 543     s->connected = 1;
 544     if (s->ioc) {
 545         chr->gsource = io_add_watch_poll(chr, s->ioc,
 546                                            tcp_chr_read_poll,
 547                                            tcp_chr_read,
 548                                            chr, chr->gcontext);
 549     }
 550
 551     s->hup_source = qio_channel_create_watch(s->ioc, G_IO_HUP);
 552     g_source_set_callback(s->hup_source, (GSourceFunc)tcp_chr_hup,
 553                           chr, NULL);
 554     g_source_attach(s->hup_source, chr->gcontext);
 555
 556     qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 557 }
 558
 559 static void tcp_chr_update_read_handler(Chardev *chr)
 560 {
 561     SocketChardev *s = SOCKET_CHARDEV(chr);
 562
 563     if (!s->connected) {
 564         return;
 565     }
 566
 567     remove_fd_in_watch(chr);
 568     if (s->ioc) {
 569         chr->gsource = io_add_watch_poll(chr, s->ioc,
 570                                            tcp_chr_read_poll,
 571                                            tcp_chr_read, chr,
 572                                            chr->gcontext);
 573     }
 574 }
 575
 576 typedef struct {
 577     Chardev *chr;
 578     char buf[21];
 579     size_t buflen;
 580 } TCPChardevTelnetInit;
 581
 582 static gboolean tcp_chr_telnet_init_io(QIOChannel *ioc,
 583                                        GIOCondition cond G_GNUC_UNUSED,
 584                                        gpointer user_data)
 585 {
 586     TCPChardevTelnetInit *init = user_data;
 587     ssize_t ret;
 588
 589     ret = qio_channel_write(ioc, init->buf, init->buflen, NULL);
 590     if (ret < 0) {
 591         if (ret == QIO_CHANNEL_ERR_BLOCK) {
 592             ret = 0;
 593         } else {
 594             tcp_chr_disconnect(init->chr);
 595             goto end;
 596         }
 597     }
 598     init->buflen -= ret;
 599
 600     if (init->buflen == 0) {
 601         tcp_chr_connect(init->chr);
 602         goto end;
 603     }
 604
 605     memmove(init->buf, init->buf + ret, init->buflen);
 606
 607     return G_SOURCE_CONTINUE;
 608
 609 end:
 610     g_free(init);
 611     return G_SOURCE_REMOVE;
 612 }
 613
 614 static void tcp_chr_telnet_init(Chardev *chr)
 615 {
 616     SocketChardev *s = SOCKET_CHARDEV(chr);
 617     TCPChardevTelnetInit *init = g_new0(TCPChardevTelnetInit, 1);
 618     size_t n = 0;
 619
 620 #define IACSET(x, a, b, c)                      \
 621     do {                                        \
 622         x[n++] = a;                             \
 623         x[n++] = b;                             \
 624         x[n++] = c;                             \
 625     } while (0)
 626
 627     init->chr = chr;
 628     if (!s->is_tn3270) {
 629         init->buflen = 12;
 630         /* Prep the telnet negotion to put telnet in binary,
 631          * no echo, single char mode */
 632         IACSET(init->buf, 0xff, 0xfb, 0x01);  /* IAC WILL ECHO */
 633         IACSET(init->buf, 0xff, 0xfb, 0x03);  /* IAC WILL Suppress go ahead */
 634         IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL Binary */
 635         IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO Binary */
 636     } else {
 637         init->buflen = 21;
 638         /* Prep the TN3270 negotion based on RFC1576 */
 639         IACSET(init->buf, 0xff, 0xfd, 0x19);  /* IAC DO EOR */
 640         IACSET(init->buf, 0xff, 0xfb, 0x19);  /* IAC WILL EOR */
 641         IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO BINARY */
 642         IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL BINARY */
 643         IACSET(init->buf, 0xff, 0xfd, 0x18);  /* IAC DO TERMINAL TYPE */
 644         IACSET(init->buf, 0xff, 0xfa, 0x18);  /* IAC SB TERMINAL TYPE */
 645         IACSET(init->buf, 0x01, 0xff, 0xf0);  /* SEND IAC SE */
 646     }
 647
 648 #undef IACSET
 649
 650     qio_channel_add_watch(
 651         s->ioc, G_IO_OUT,
 652         tcp_chr_telnet_init_io,
 653         init, NULL);
 654 }
 655
 656
 657 static void tcp_chr_tls_handshake(QIOTask *task,
 658                                   gpointer user_data)
 659 {
 660     Chardev *chr = user_data;
 661     SocketChardev *s = user_data;
 662
 663     if (qio_task_propagate_error(task, NULL)) {
 664         tcp_chr_disconnect(chr);
 665     } else {
 666         if (s->do_telnetopt) {
 667             tcp_chr_telnet_init(chr);
 668         } else {
 669             tcp_chr_connect(chr);
 670         }
 671     }
 672 }
 673
 674
 675 static void tcp_chr_tls_init(Chardev *chr)
 676 {
 677     SocketChardev *s = SOCKET_CHARDEV(chr);
 678     QIOChannelTLS *tioc;
 679     Error *err = NULL;
 680     gchar *name;
 681
 682     if (s->is_listen) {
 683         tioc = qio_channel_tls_new_server(
 684             s->ioc, s->tls_creds,
 685             NULL, /* XXX Use an ACL */
 686             &err);
 687     } else {
 688         tioc = qio_channel_tls_new_client(
 689             s->ioc, s->tls_creds,
 690             s->addr->u.inet.host,
 691             &err);
 692     }
 693     if (tioc == NULL) {
 694         error_free(err);
 695         tcp_chr_disconnect(chr);
 696         return;
 697     }
 698     name = g_strdup_printf("chardev-tls-%s-%s",
 699                            s->is_listen ? "server" : "client",
 700                            chr->label);
 701     qio_channel_set_name(QIO_CHANNEL(tioc), name);
 702     g_free(name);
 703     object_unref(OBJECT(s->ioc));
 704     s->ioc = QIO_CHANNEL(tioc);
 705
 706     qio_channel_tls_handshake(tioc,
 707                               tcp_chr_tls_handshake,
 708                               chr,
 709                               NULL,
 710                               NULL);
 711 }
 712
 713
 714 static void tcp_chr_set_client_ioc_name(Chardev *chr,
 715                                         QIOChannelSocket *sioc)
 716 {
 717     SocketChardev *s = SOCKET_CHARDEV(chr);
 718     char *name;
 719     name = g_strdup_printf("chardev-tcp-%s-%s",
 720                            s->is_listen ? "server" : "client",
 721                            chr->label);
 722     qio_channel_set_name(QIO_CHANNEL(sioc), name);
 723     g_free(name);
 724
 725 }
 726
 727 static int tcp_chr_new_client(Chardev *chr, QIOChannelSocket *sioc)
 728 {
 729     SocketChardev *s = SOCKET_CHARDEV(chr);
 730
 731     if (s->ioc != NULL) {
 732         return -1;
 733     }
 734
 735     s->ioc = QIO_CHANNEL(sioc);
 736     object_ref(OBJECT(sioc));
 737     s->sioc = sioc;
 738     object_ref(OBJECT(sioc));
 739
 740     qio_channel_set_blocking(s->ioc, false, NULL);
 741
 742     if (s->do_nodelay) {
 743         qio_channel_set_delay(s->ioc, false);
 744     }
 745     if (s->listener) {
 746         qio_net_listener_set_client_func(s->listener, NULL, NULL, NULL);
 747     }
 748
 749     if (s->tls_creds) {
 750         tcp_chr_tls_init(chr);
 751     } else {
 752         if (s->do_telnetopt) {
 753             tcp_chr_telnet_init(chr);
 754         } else {
 755             tcp_chr_connect(chr);
 756         }
 757     }
 758
 759     return 0;
 760 }
 761
 762
 763 static int tcp_chr_add_client(Chardev *chr, int fd)
 764 {
 765     int ret;
 766     QIOChannelSocket *sioc;
 767
 768     sioc = qio_channel_socket_new_fd(fd, NULL);
 769     if (!sioc) {
 770         return -1;
 771     }
 772     tcp_chr_set_client_ioc_name(chr, sioc);
 773     ret = tcp_chr_new_client(chr, sioc);
 774     object_unref(OBJECT(sioc));
 775     return ret;
 776 }
 777
 778 static void tcp_chr_accept(QIONetListener *listener,
 779                            QIOChannelSocket *cioc,
 780                            void *opaque)
 781 {
 782     Chardev *chr = CHARDEV(opaque);
 783
 784     tcp_chr_set_client_ioc_name(chr, cioc);
 785     tcp_chr_new_client(chr, cioc);
 786 }
 787
 788 static int tcp_chr_wait_connected(Chardev *chr, Error **errp)
 789 {
 790     SocketChardev *s = SOCKET_CHARDEV(chr);
 791     QIOChannelSocket *sioc;
 792
 793     /* It can't wait on s->connected, since it is set asynchronously
 794      * in TLS and telnet cases, only wait for an accepted socket */
 795     while (!s->ioc) {
 796         if (s->is_listen) {
 797             info_report("QEMU waiting for connection on: %s",
 798                         chr->filename);
 799             sioc = qio_net_listener_wait_client(s->listener);
 800             tcp_chr_set_client_ioc_name(chr, sioc);
 801             tcp_chr_new_client(chr, sioc);
 802             object_unref(OBJECT(sioc));
 803         } else {
 804             sioc = qio_channel_socket_new();
 805             tcp_chr_set_client_ioc_name(chr, sioc);
 806             if (qio_channel_socket_connect_sync(sioc, s->addr, errp) < 0) {
 807                 object_unref(OBJECT(sioc));
 808                 return -1;
 809             }
 810             tcp_chr_new_client(chr, sioc);
 811             object_unref(OBJECT(sioc));
 812         }
 813     }
 814
 815     return 0;
 816 }
 817
 818 static void char_socket_finalize(Object *obj)
 819 {
 820     Chardev *chr = CHARDEV(obj);
 821     SocketChardev *s = SOCKET_CHARDEV(obj);
 822
 823     tcp_chr_free_connection(chr);
 824     tcp_chr_reconn_timer_cancel(s);
 825     qapi_free_SocketAddress(s->addr);
 826     if (s->listener) {
 827         qio_net_listener_set_client_func(s->listener, NULL, NULL, NULL);
 828         object_unref(OBJECT(s->listener));
 829     }
 830     if (s->tls_creds) {
 831         object_unref(OBJECT(s->tls_creds));
 832     }
 833
 834     qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 835 }
 836
 837 static void qemu_chr_socket_connected(QIOTask *task, void *opaque)
 838 {
 839     QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
 840     Chardev *chr = CHARDEV(opaque);
 841     SocketChardev *s = SOCKET_CHARDEV(chr);
 842     Error *err = NULL;
 843
 844     if (qio_task_propagate_error(task, &err)) {
 845         check_report_connect_error(chr, err);
 846         error_free(err);
 847         goto cleanup;
 848     }
 849
 850     s->connect_err_reported = false;
 851     tcp_chr_new_client(chr, sioc);
 852
 853 cleanup:
 854     object_unref(OBJECT(sioc));
 855 }
 856
 857 static gboolean socket_reconnect_timeout(gpointer opaque)
 858 {
 859     Chardev *chr = CHARDEV(opaque);
 860     SocketChardev *s = SOCKET_CHARDEV(opaque);
 861     QIOChannelSocket *sioc;
 862
 863     g_source_unref(s->reconnect_timer);
 864     s->reconnect_timer = NULL;
 865
 866     if (chr->be_open) {
 867         return false;
 868     }
 869
 870     sioc = qio_channel_socket_new();
 871     tcp_chr_set_client_ioc_name(chr, sioc);
 872     qio_channel_socket_connect_async(sioc, s->addr,
 873                                      qemu_chr_socket_connected,
 874                                      chr, NULL, NULL);
 875
 876     return false;
 877 }
 878
 879 static void qmp_chardev_open_socket(Chardev *chr,
 880                                     ChardevBackend *backend,
 881                                     bool *be_opened,
 882                                     Error **errp)
 883 {
 884     SocketChardev *s = SOCKET_CHARDEV(chr);
 885     ChardevSocket *sock = backend->u.socket.data;
 886     bool do_nodelay     = sock->has_nodelay ? sock->nodelay : false;
 887     bool is_listen      = sock->has_server  ? sock->server  : true;
 888     bool is_telnet      = sock->has_telnet  ? sock->telnet  : false;
 889     bool is_tn3270      = sock->has_tn3270  ? sock->tn3270  : false;
 890     bool is_waitconnect = sock->has_wait    ? sock->wait    : false;
 891     int64_t reconnect   = sock->has_reconnect ? sock->reconnect : 0;
 892     QIOChannelSocket *sioc = NULL;
 893     SocketAddress *addr;
 894
 895     s->is_listen = is_listen;
 896     s->is_telnet = is_telnet;
 897     s->is_tn3270 = is_tn3270;
 898     s->do_nodelay = do_nodelay;
 899     if (sock->tls_creds) {
 900         Object *creds;
 901         creds = object_resolve_path_component(
 902             object_get_objects_root(), sock->tls_creds);
 903         if (!creds) {
 904             error_setg(errp, "No TLS credentials with id '%s'",
 905                        sock->tls_creds);
 906             goto error;
 907         }
 908         s->tls_creds = (QCryptoTLSCreds *)
 909             object_dynamic_cast(creds,
 910                                 TYPE_QCRYPTO_TLS_CREDS);
 911         if (!s->tls_creds) {
 912             error_setg(errp, "Object with id '%s' is not TLS credentials",
 913                        sock->tls_creds);
 914             goto error;
 915         }
 916         object_ref(OBJECT(s->tls_creds));
 917         if (is_listen) {
 918             if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
 919                 error_setg(errp, "%s",
 920                            "Expected TLS credentials for server endpoint");
 921                 goto error;
 922             }
 923         } else {
 924             if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
 925                 error_setg(errp, "%s",
 926                            "Expected TLS credentials for client endpoint");
 927                 goto error;
 928             }
 929         }
 930     }
 931
 932     s->addr = addr = socket_address_flatten(sock->addr);
 933
 934     qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE);
 935     /* TODO SOCKET_ADDRESS_FD where fd has AF_UNIX */
 936     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX) {
 937         qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_FD_PASS);
 938     }
 939
 940     /* be isn't opened until we get a connection */
 941     *be_opened = false;
 942
 943     update_disconnected_filename(s);
 944
 945     if (is_listen) {
 946         if (is_telnet || is_tn3270) {
 947             s->do_telnetopt = 1;
 948         }
 949     } else if (reconnect > 0) {
 950         s->reconnect_time = reconnect;
 951     }
 952
 953     if (s->reconnect_time) {
 954         sioc = qio_channel_socket_new();
 955         tcp_chr_set_client_ioc_name(chr, sioc);
 956         qio_channel_socket_connect_async(sioc, s->addr,
 957                                          qemu_chr_socket_connected,
 958                                          chr, NULL, NULL);
 959     } else {
 960         if (s->is_listen) {
 961             char *name;
 962             s->listener = qio_net_listener_new();
 963
 964             name = g_strdup_printf("chardev-tcp-listener-%s", chr->label);
 965             qio_net_listener_set_name(s->listener, name);
 966             g_free(name);
 967
 968             if (qio_net_listener_open_sync(s->listener, s->addr, errp) < 0) {
 969                 object_unref(OBJECT(s->listener));
 970                 s->listener = NULL;
 971                 goto error;
 972             }
 973
 974             qapi_free_SocketAddress(s->addr);
 975             s->addr = socket_local_address(s->listener->sioc[0]->fd, errp);
 976             update_disconnected_filename(s);
 977
 978             if (is_waitconnect &&
 979                 qemu_chr_wait_connected(chr, errp) < 0) {
 980                 return;
 981             }
 982             if (!s->ioc) {
 983                 qio_net_listener_set_client_func(s->listener, tcp_chr_accept,
 984                                                  chr, NULL);
 985             }
 986         } else if (qemu_chr_wait_connected(chr, errp) < 0) {
 987             goto error;
 988         }
 989     }
 990
 991     return;
 992
 993 error:
 994     if (sioc) {
 995         object_unref(OBJECT(sioc));
 996     }
 997 }
 998
 999 static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
1000                                   Error **errp)
1001 {
1002     bool is_listen      = qemu_opt_get_bool(opts, "server", false);
1003     bool is_waitconnect = is_listen && qemu_opt_get_bool(opts, "wait", true);
1004     bool is_telnet      = qemu_opt_get_bool(opts, "telnet", false);
1005     bool is_tn3270      = qemu_opt_get_bool(opts, "tn3270", false);
1006     bool do_nodelay     = !qemu_opt_get_bool(opts, "delay", true);
1007     int64_t reconnect   = qemu_opt_get_number(opts, "reconnect", 0);
1008     const char *path = qemu_opt_get(opts, "path");
1009     const char *host = qemu_opt_get(opts, "host");
1010     const char *port = qemu_opt_get(opts, "port");
1011     const char *tls_creds = qemu_opt_get(opts, "tls-creds");
1012     SocketAddressLegacy *addr;
1013     ChardevSocket *sock;
1014
1015     backend->type = CHARDEV_BACKEND_KIND_SOCKET;
1016     if (!path) {
1017         if (!host) {
1018             error_setg(errp, "chardev: socket: no host given");
1019             return;
1020         }
1021         if (!port) {
1022             error_setg(errp, "chardev: socket: no port given");
1023             return;
1024         }
1025     } else {
1026         if (tls_creds) {
1027             error_setg(errp, "TLS can only be used over TCP socket");
1028             return;
1029         }
1030     }
1031
1032     sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
1033     qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));
1034
1035     sock->has_nodelay = true;
1036     sock->nodelay = do_nodelay;
1037     sock->has_server = true;
1038     sock->server = is_listen;
1039     sock->has_telnet = true;
1040     sock->telnet = is_telnet;
1041     sock->has_tn3270 = true;
1042     sock->tn3270 = is_tn3270;
1043     sock->has_wait = true;
1044     sock->wait = is_waitconnect;
1045     sock->has_reconnect = true;
1046     sock->reconnect = reconnect;
1047     sock->tls_creds = g_strdup(tls_creds);
1048
1049     addr = g_new0(SocketAddressLegacy, 1);
1050     if (path) {
1051         UnixSocketAddress *q_unix;
1052         addr->type = SOCKET_ADDRESS_LEGACY_KIND_UNIX;
1053         q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
1054         q_unix->path = g_strdup(path);
1055     } else {
1056         addr->type = SOCKET_ADDRESS_LEGACY_KIND_INET;
1057         addr->u.inet.data = g_new(InetSocketAddress, 1);
1058         *addr->u.inet.data = (InetSocketAddress) {
1059             .host = g_strdup(host),
1060             .port = g_strdup(port),
1061             .has_to = qemu_opt_get(opts, "to"),
1062             .to = qemu_opt_get_number(opts, "to", 0),
1063             .has_ipv4 = qemu_opt_get(opts, "ipv4"),
1064             .ipv4 = qemu_opt_get_bool(opts, "ipv4", 0),
1065             .has_ipv6 = qemu_opt_get(opts, "ipv6"),
1066             .ipv6 = qemu_opt_get_bool(opts, "ipv6", 0),
1067         };
1068     }
1069     sock->addr = addr;
1070 }
1071
1072 static void
1073 char_socket_get_addr(Object *obj, Visitor *v, const char *name,
1074                      void *opaque, Error **errp)
1075 {
1076     SocketChardev *s = SOCKET_CHARDEV(obj);
1077
1078     visit_type_SocketAddress(v, name, &s->addr, errp);
1079 }
1080
1081 static bool
1082 char_socket_get_connected(Object *obj, Error **errp)
1083 {
1084     SocketChardev *s = SOCKET_CHARDEV(obj);
1085
1086     return s->connected;
1087 }
1088
1089 static void char_socket_class_init(ObjectClass *oc, void *data)
1090 {
1091     ChardevClass *cc = CHARDEV_CLASS(oc);
1092
1093     cc->parse = qemu_chr_parse_socket;
1094     cc->open = qmp_chardev_open_socket;
1095     cc->chr_wait_connected = tcp_chr_wait_connected;
1096     cc->chr_write = tcp_chr_write;
1097     cc->chr_sync_read = tcp_chr_sync_read;
1098     cc->chr_disconnect = tcp_chr_disconnect;
1099     cc->get_msgfds = tcp_get_msgfds;
1100     cc->set_msgfds = tcp_set_msgfds;
1101     cc->chr_add_client = tcp_chr_add_client;
1102     cc->chr_add_watch = tcp_chr_add_watch;
1103     cc->chr_update_read_handler = tcp_chr_update_read_handler;
1104
1105     object_class_property_add(oc, "addr", "SocketAddress",
1106                               char_socket_get_addr, NULL,
1107                               NULL, NULL, &error_abort);
1108
1109     object_class_property_add_bool(oc, "connected", char_socket_get_connected,
1110                                    NULL, &error_abort);
1111 }
1112
1113 static const TypeInfo char_socket_type_info = {
1114     .name = TYPE_CHARDEV_SOCKET,
1115     .parent = TYPE_CHARDEV,
1116     .instance_size = sizeof(SocketChardev),
1117     .instance_finalize = char_socket_finalize,
1118     .class_init = char_socket_class_init,
1119 };
1120
1121 static void register_types(void)
1122 {
1123     type_register_static(&char_socket_type_info);
1124 }
1125
1126 type_init(register_types);