io/channel-websock.c

   1 /*
   2  * QEMU I/O channels driver websockets
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "qemu/bswap.h"
  24 #include "io/channel-websock.h"
  25 #include "crypto/hash.h"
  26 #include "trace.h"
  27 #include "qemu/iov.h"
  28
  29 /* Max amount to allow in rawinput/encoutput buffers */
  30 #define QIO_CHANNEL_WEBSOCK_MAX_BUFFER 8192
  31
  32 #define QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN 24
  33 #define QIO_CHANNEL_WEBSOCK_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
  34 #define QIO_CHANNEL_WEBSOCK_GUID_LEN strlen(QIO_CHANNEL_WEBSOCK_GUID)
  35
  36 #define QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL "sec-websocket-protocol"
  37 #define QIO_CHANNEL_WEBSOCK_HEADER_VERSION "sec-websocket-version"
  38 #define QIO_CHANNEL_WEBSOCK_HEADER_KEY "sec-websocket-key"
  39 #define QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE "upgrade"
  40 #define QIO_CHANNEL_WEBSOCK_HEADER_HOST "host"
  41 #define QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION "connection"
  42
  43 #define QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY "binary"
  44 #define QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE "Upgrade"
  45 #define QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET "websocket"
  46
  47 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON \
  48     "Server: QEMU VNC\r\n"                       \
  49     "Date: %s\r\n"
  50
  51 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_OK    \
  52     "HTTP/1.1 101 Switching Protocols\r\n"      \
  53     QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON    \
  54     "Upgrade: websocket\r\n"                    \
  55     "Connection: Upgrade\r\n"                   \
  56     "Sec-WebSocket-Accept: %s\r\n"              \
  57     "Sec-WebSocket-Protocol: binary\r\n"        \
  58     "\r\n"
  59 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_NOT_FOUND \
  60     "HTTP/1.1 404 Not Found\r\n"                    \
  61     QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON        \
  62     "Connection: close\r\n"                         \
  63     "\r\n"
  64 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_BAD_REQUEST \
  65     "HTTP/1.1 400 Bad Request\r\n"                    \
  66     QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON          \
  67     "Connection: close\r\n"                           \
  68     "Sec-WebSocket-Version: "                         \
  69     QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION             \
  70     "\r\n"
  71 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_SERVER_ERR \
  72     "HTTP/1.1 500 Internal Server Error\r\n"         \
  73     QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON         \
  74     "Connection: close\r\n"                          \
  75     "\r\n"
  76 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_TOO_LARGE  \
  77     "HTTP/1.1 403 Request Entity Too Large\r\n"      \
  78     QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON         \
  79     "Connection: close\r\n"                          \
  80     "\r\n"
  81 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM "\r\n"
  82 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_END "\r\n\r\n"
  83 #define QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION "13"
  84 #define QIO_CHANNEL_WEBSOCK_HTTP_METHOD "GET"
  85 #define QIO_CHANNEL_WEBSOCK_HTTP_PATH "/"
  86 #define QIO_CHANNEL_WEBSOCK_HTTP_VERSION "HTTP/1.1"
  87
  88 /* The websockets packet header is variable length
  89  * depending on the size of the payload... */
  90
  91 /* ...length when using 7-bit payload length */
  92 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT 6
  93 /* ...length when using 16-bit payload length */
  94 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT 8
  95 /* ...length when using 64-bit payload length */
  96 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT 14
  97
  98 /* Length of the optional data mask field in header */
  99 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK 4
 100
 101 /* Maximum length that can fit in 7-bit payload size */
 102 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT 126
 103 /* Maximum length that can fit in 16-bit payload size */
 104 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT 65536
 105
 106 /* Magic 7-bit length to indicate use of 16-bit payload length */
 107 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT 126
 108 /* Magic 7-bit length to indicate use of 64-bit payload length */
 109 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT 127
 110
 111 /* Bitmasks for accessing header fields */
 112 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN 0x80
 113 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE 0x0f
 114 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK 0x80
 115 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN 0x7f
 116 #define QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK 0x8
 117
 118 typedef struct QIOChannelWebsockHeader QIOChannelWebsockHeader;
 119
 120 struct QEMU_PACKED QIOChannelWebsockHeader {
 121     unsigned char b0;
 122     unsigned char b1;
 123     union {
 124         struct QEMU_PACKED {
 125             uint16_t l16;
 126             QIOChannelWebsockMask m16;
 127         } s16;
 128         struct QEMU_PACKED {
 129             uint64_t l64;
 130             QIOChannelWebsockMask m64;
 131         } s64;
 132         QIOChannelWebsockMask m;
 133     } u;
 134 };
 135
 136 typedef struct QIOChannelWebsockHTTPHeader QIOChannelWebsockHTTPHeader;
 137
 138 struct QIOChannelWebsockHTTPHeader {
 139     char *name;
 140     char *value;
 141 };
 142
 143 enum {
 144     QIO_CHANNEL_WEBSOCK_OPCODE_CONTINUATION = 0x0,
 145     QIO_CHANNEL_WEBSOCK_OPCODE_TEXT_FRAME = 0x1,
 146     QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME = 0x2,
 147     QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE = 0x8,
 148     QIO_CHANNEL_WEBSOCK_OPCODE_PING = 0x9,
 149     QIO_CHANNEL_WEBSOCK_OPCODE_PONG = 0xA
 150 };
 151
 152 static void GCC_FMT_ATTR(2, 3)
 153 qio_channel_websock_handshake_send_res(QIOChannelWebsock *ioc,
 154                                        const char *resmsg,
 155                                        ...)
 156 {
 157     va_list vargs;
 158     char *response;
 159     size_t responselen;
 160
 161     va_start(vargs, resmsg);
 162     response = g_strdup_vprintf(resmsg, vargs);
 163     responselen = strlen(response);
 164     buffer_reserve(&ioc->encoutput, responselen);
 165     buffer_append(&ioc->encoutput, response, responselen);
 166     va_end(vargs);
 167 }
 168
 169 static gchar *qio_channel_websock_date_str(void)
 170 {
 171     struct tm tm;
 172     time_t now = time(NULL);
 173     char datebuf[128];
 174
 175     gmtime_r(&now, &tm);
 176
 177     strftime(datebuf, sizeof(datebuf), "%a, %d %b %Y %H:%M:%S GMT", &tm);
 178
 179     return g_strdup(datebuf);
 180 }
 181
 182 static void qio_channel_websock_handshake_send_res_err(QIOChannelWebsock *ioc,
 183                                                        const char *resdata)
 184 {
 185     char *date = qio_channel_websock_date_str();
 186     qio_channel_websock_handshake_send_res(ioc, resdata, date);
 187     g_free(date);
 188 }
 189
 190 enum {
 191     QIO_CHANNEL_WEBSOCK_STATUS_NORMAL = 1000,
 192     QIO_CHANNEL_WEBSOCK_STATUS_PROTOCOL_ERR = 1002,
 193     QIO_CHANNEL_WEBSOCK_STATUS_INVALID_DATA = 1003,
 194     QIO_CHANNEL_WEBSOCK_STATUS_POLICY = 1008,
 195     QIO_CHANNEL_WEBSOCK_STATUS_TOO_LARGE = 1009,
 196     QIO_CHANNEL_WEBSOCK_STATUS_SERVER_ERR = 1011,
 197 };
 198
 199 static size_t
 200 qio_channel_websock_extract_headers(QIOChannelWebsock *ioc,
 201                                     char *buffer,
 202                                     QIOChannelWebsockHTTPHeader *hdrs,
 203                                     size_t nhdrsalloc,
 204                                     Error **errp)
 205 {
 206     char *nl, *sep, *tmp;
 207     size_t nhdrs = 0;
 208
 209     /*
 210      * First parse the HTTP protocol greeting of format:
 211      *
 212      *   $METHOD $PATH $VERSION
 213      *
 214      * e.g.
 215      *
 216      *   GET / HTTP/1.1
 217      */
 218
 219     nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
 220     if (!nl) {
 221         error_setg(errp, "Missing HTTP header delimiter");
 222         goto bad_request;
 223     }
 224     *nl = '\0';
 225     trace_qio_channel_websock_http_greeting(ioc, buffer);
 226
 227     tmp = strchr(buffer, ' ');
 228     if (!tmp) {
 229         error_setg(errp, "Missing HTTP path delimiter");
 230         return 0;
 231     }
 232     *tmp = '\0';
 233
 234     if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_METHOD)) {
 235         error_setg(errp, "Unsupported HTTP method %s", buffer);
 236         goto bad_request;
 237     }
 238
 239     buffer = tmp + 1;
 240     tmp = strchr(buffer, ' ');
 241     if (!tmp) {
 242         error_setg(errp, "Missing HTTP version delimiter");
 243         goto bad_request;
 244     }
 245     *tmp = '\0';
 246
 247     if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_PATH)) {
 248         qio_channel_websock_handshake_send_res_err(
 249             ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_NOT_FOUND);
 250         error_setg(errp, "Unexpected HTTP path %s", buffer);
 251         return 0;
 252     }
 253
 254     buffer = tmp + 1;
 255
 256     if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_VERSION)) {
 257         error_setg(errp, "Unsupported HTTP version %s", buffer);
 258         goto bad_request;
 259     }
 260
 261     buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
 262
 263     /*
 264      * Now parse all the header fields of format
 265      *
 266      *   $NAME: $VALUE
 267      *
 268      * e.g.
 269      *
 270      *   Cache-control: no-cache
 271      */
 272     do {
 273         QIOChannelWebsockHTTPHeader *hdr;
 274
 275         nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
 276         if (nl) {
 277             *nl = '\0';
 278         }
 279
 280         sep = strchr(buffer, ':');
 281         if (!sep) {
 282             error_setg(errp, "Malformed HTTP header");
 283             goto bad_request;
 284         }
 285         *sep = '\0';
 286         sep++;
 287         while (*sep == ' ') {
 288             sep++;
 289         }
 290
 291         if (nhdrs >= nhdrsalloc) {
 292             error_setg(errp, "Too many HTTP headers");
 293             goto bad_request;
 294         }
 295
 296         hdr = &hdrs[nhdrs++];
 297         hdr->name = buffer;
 298         hdr->value = sep;
 299
 300         /* Canonicalize header name for easier identification later */
 301         for (tmp = hdr->name; *tmp; tmp++) {
 302             *tmp = g_ascii_tolower(*tmp);
 303         }
 304
 305         if (nl) {
 306             buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
 307         }
 308     } while (nl != NULL);
 309
 310     return nhdrs;
 311
 312  bad_request:
 313     qio_channel_websock_handshake_send_res_err(
 314         ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_BAD_REQUEST);
 315     return 0;
 316 }
 317
 318 static const char *
 319 qio_channel_websock_find_header(QIOChannelWebsockHTTPHeader *hdrs,
 320                                 size_t nhdrs,
 321                                 const char *name)
 322 {
 323     size_t i;
 324
 325     for (i = 0; i < nhdrs; i++) {
 326         if (g_str_equal(hdrs[i].name, name)) {
 327             return hdrs[i].value;
 328         }
 329     }
 330
 331     return NULL;
 332 }
 333
 334
 335 static void qio_channel_websock_handshake_send_res_ok(QIOChannelWebsock *ioc,
 336                                                       const char *key,
 337                                                       Error **errp)
 338 {
 339     char combined_key[QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
 340                       QIO_CHANNEL_WEBSOCK_GUID_LEN + 1];
 341     char *accept = NULL;
 342     char *date = NULL;
 343
 344     g_strlcpy(combined_key, key, QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + 1);
 345     g_strlcat(combined_key, QIO_CHANNEL_WEBSOCK_GUID,
 346               QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
 347               QIO_CHANNEL_WEBSOCK_GUID_LEN + 1);
 348
 349     /* hash and encode it */
 350     if (qcrypto_hash_base64(QCRYPTO_HASH_ALG_SHA1,
 351                             combined_key,
 352                             QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
 353                             QIO_CHANNEL_WEBSOCK_GUID_LEN,
 354                             &accept,
 355                             errp) < 0) {
 356         qio_channel_websock_handshake_send_res_err(
 357             ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_SERVER_ERR);
 358         return;
 359     }
 360
 361     date = qio_channel_websock_date_str();
 362     qio_channel_websock_handshake_send_res(
 363         ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_OK, date, accept);
 364
 365     g_free(date);
 366     g_free(accept);
 367 }
 368
 369 static void qio_channel_websock_handshake_process(QIOChannelWebsock *ioc,
 370                                                   char *buffer,
 371                                                   Error **errp)
 372 {
 373     QIOChannelWebsockHTTPHeader hdrs[32];
 374     size_t nhdrs = G_N_ELEMENTS(hdrs);
 375     const char *protocols = NULL, *version = NULL, *key = NULL,
 376         *host = NULL, *connection = NULL, *upgrade = NULL;
 377     char **connectionv;
 378     bool upgraded = false;
 379     size_t i;
 380
 381     nhdrs = qio_channel_websock_extract_headers(ioc, buffer, hdrs, nhdrs, errp);
 382     if (!nhdrs) {
 383         return;
 384     }
 385
 386     protocols = qio_channel_websock_find_header(
 387         hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL);
 388     if (!protocols) {
 389         error_setg(errp, "Missing websocket protocol header data");
 390         goto bad_request;
 391     }
 392
 393     version = qio_channel_websock_find_header(
 394         hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_VERSION);
 395     if (!version) {
 396         error_setg(errp, "Missing websocket version header data");
 397         goto bad_request;
 398     }
 399
 400     key = qio_channel_websock_find_header(
 401         hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_KEY);
 402     if (!key) {
 403         error_setg(errp, "Missing websocket key header data");
 404         goto bad_request;
 405     }
 406
 407     host = qio_channel_websock_find_header(
 408         hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_HOST);
 409     if (!host) {
 410         error_setg(errp, "Missing websocket host header data");
 411         goto bad_request;
 412     }
 413
 414     connection = qio_channel_websock_find_header(
 415         hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION);
 416     if (!connection) {
 417         error_setg(errp, "Missing websocket connection header data");
 418         goto bad_request;
 419     }
 420
 421     upgrade = qio_channel_websock_find_header(
 422         hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE);
 423     if (!upgrade) {
 424         error_setg(errp, "Missing websocket upgrade header data");
 425         goto bad_request;
 426     }
 427
 428     trace_qio_channel_websock_http_request(ioc, protocols, version,
 429                                            host, connection, upgrade, key);
 430
 431     if (!g_strrstr(protocols, QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY)) {
 432         error_setg(errp, "No '%s' protocol is supported by client '%s'",
 433                    QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY, protocols);
 434         goto bad_request;
 435     }
 436
 437     if (!g_str_equal(version, QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION)) {
 438         error_setg(errp, "Version '%s' is not supported by client '%s'",
 439                    QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION, version);
 440         goto bad_request;
 441     }
 442
 443     if (strlen(key) != QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN) {
 444         error_setg(errp, "Key length '%zu' was not as expected '%d'",
 445                    strlen(key), QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN);
 446         goto bad_request;
 447     }
 448
 449     connectionv = g_strsplit(connection, ",", 0);
 450     for (i = 0; connectionv != NULL && connectionv[i] != NULL; i++) {
 451         g_strstrip(connectionv[i]);
 452         if (strcasecmp(connectionv[i],
 453                        QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE) == 0) {
 454             upgraded = true;
 455         }
 456     }
 457     g_strfreev(connectionv);
 458     if (!upgraded) {
 459         error_setg(errp, "No connection upgrade requested '%s'", connection);
 460         goto bad_request;
 461     }
 462
 463     if (strcasecmp(upgrade, QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET) != 0) {
 464         error_setg(errp, "Incorrect upgrade method '%s'", upgrade);
 465         goto bad_request;
 466     }
 467
 468     qio_channel_websock_handshake_send_res_ok(ioc, key, errp);
 469     return;
 470
 471  bad_request:
 472     qio_channel_websock_handshake_send_res_err(
 473         ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_BAD_REQUEST);
 474 }
 475
 476 static int qio_channel_websock_handshake_read(QIOChannelWebsock *ioc,
 477                                               Error **errp)
 478 {
 479     char *handshake_end;
 480     ssize_t ret;
 481     /* Typical HTTP headers from novnc are 512 bytes, so limiting
 482      * total header size to 4096 is easily enough. */
 483     size_t want = 4096 - ioc->encinput.offset;
 484     buffer_reserve(&ioc->encinput, want);
 485     ret = qio_channel_read(ioc->master,
 486                            (char *)buffer_end(&ioc->encinput), want, errp);
 487     if (ret < 0) {
 488         return -1;
 489     }
 490     ioc->encinput.offset += ret;
 491
 492     handshake_end = g_strstr_len((char *)ioc->encinput.buffer,
 493                                  ioc->encinput.offset,
 494                                  QIO_CHANNEL_WEBSOCK_HANDSHAKE_END);
 495     if (!handshake_end) {
 496         if (ioc->encinput.offset >= 4096) {
 497             qio_channel_websock_handshake_send_res_err(
 498                 ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_TOO_LARGE);
 499             error_setg(errp,
 500                        "End of headers not found in first 4096 bytes");
 501             return 1;
 502         } else if (ret == 0) {
 503             error_setg(errp,
 504                        "End of headers not found before connection closed");
 505             return -1;
 506         }
 507         return 0;
 508     }
 509     *handshake_end = '\0';
 510
 511     qio_channel_websock_handshake_process(ioc,
 512                                           (char *)ioc->encinput.buffer,
 513                                           errp);
 514
 515     buffer_advance(&ioc->encinput,
 516                    handshake_end - (char *)ioc->encinput.buffer +
 517                    strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_END));
 518     return 1;
 519 }
 520
 521 static gboolean qio_channel_websock_handshake_send(QIOChannel *ioc,
 522                                                    GIOCondition condition,
 523                                                    gpointer user_data)
 524 {
 525     QIOTask *task = user_data;
 526     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
 527         qio_task_get_source(task));
 528     Error *err = NULL;
 529     ssize_t ret;
 530
 531     ret = qio_channel_write(wioc->master,
 532                             (char *)wioc->encoutput.buffer,
 533                             wioc->encoutput.offset,
 534                             &err);
 535
 536     if (ret < 0) {
 537         trace_qio_channel_websock_handshake_fail(ioc, error_get_pretty(err));
 538         qio_task_set_error(task, err);
 539         qio_task_complete(task);
 540         return FALSE;
 541     }
 542
 543     buffer_advance(&wioc->encoutput, ret);
 544     if (wioc->encoutput.offset == 0) {
 545         if (wioc->io_err) {
 546             trace_qio_channel_websock_handshake_fail(
 547                 ioc, error_get_pretty(wioc->io_err));
 548             qio_task_set_error(task, wioc->io_err);
 549             wioc->io_err = NULL;
 550             qio_task_complete(task);
 551         } else {
 552             trace_qio_channel_websock_handshake_complete(ioc);
 553             qio_task_complete(task);
 554         }
 555         return FALSE;
 556     }
 557     trace_qio_channel_websock_handshake_pending(ioc, G_IO_OUT);
 558     return TRUE;
 559 }
 560
 561 static gboolean qio_channel_websock_handshake_io(QIOChannel *ioc,
 562                                                  GIOCondition condition,
 563                                                  gpointer user_data)
 564 {
 565     QIOTask *task = user_data;
 566     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
 567         qio_task_get_source(task));
 568     Error *err = NULL;
 569     int ret;
 570
 571     ret = qio_channel_websock_handshake_read(wioc, &err);
 572     if (ret < 0) {
 573         /*
 574          * We only take this path on a fatal I/O error reading from
 575          * client connection, as most of the time we have an
 576          * HTTP 4xx err response to send instead
 577          */
 578         trace_qio_channel_websock_handshake_fail(ioc, error_get_pretty(err));
 579         qio_task_set_error(task, err);
 580         qio_task_complete(task);
 581         return FALSE;
 582     }
 583     if (ret == 0) {
 584         trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
 585         /* need more data still */
 586         return TRUE;
 587     }
 588
 589     if (err) {
 590         error_propagate(&wioc->io_err, err);
 591     }
 592
 593     trace_qio_channel_websock_handshake_reply(ioc);
 594     qio_channel_add_watch(
 595         wioc->master,
 596         G_IO_OUT,
 597         qio_channel_websock_handshake_send,
 598         task,
 599         NULL);
 600     return FALSE;
 601 }
 602
 603
 604 static void qio_channel_websock_encode(QIOChannelWebsock *ioc,
 605                                        uint8_t opcode,
 606                                        const struct iovec *iov,
 607                                        size_t niov,
 608                                        size_t size)
 609 {
 610     size_t header_size;
 611     size_t i;
 612     union {
 613         char buf[QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT];
 614         QIOChannelWebsockHeader ws;
 615     } header;
 616
 617     assert(size <= iov_size(iov, niov));
 618
 619     header.ws.b0 = QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN |
 620         (opcode & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE);
 621     if (size < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT) {
 622         header.ws.b1 = (uint8_t)size;
 623         header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
 624     } else if (size < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT) {
 625         header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT;
 626         header.ws.u.s16.l16 = cpu_to_be16((uint16_t)size);
 627         header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
 628     } else {
 629         header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT;
 630         header.ws.u.s64.l64 = cpu_to_be64(size);
 631         header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
 632     }
 633     header_size -= QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK;
 634
 635     trace_qio_channel_websock_encode(ioc, opcode, header_size, size);
 636     buffer_reserve(&ioc->encoutput, header_size + size);
 637     buffer_append(&ioc->encoutput, header.buf, header_size);
 638     for (i = 0; i < niov && size != 0; i++) {
 639         size_t want = iov[i].iov_len;
 640         if (want > size) {
 641             want = size;
 642         }
 643         buffer_append(&ioc->encoutput, iov[i].iov_base, want);
 644         size -= want;
 645     }
 646 }
 647
 648
 649 static ssize_t qio_channel_websock_write_wire(QIOChannelWebsock *, Error **);
 650
 651
 652 static void qio_channel_websock_write_close(QIOChannelWebsock *ioc,
 653                                             uint16_t code, const char *reason)
 654 {
 655     struct iovec iov[2] = {
 656         { .iov_base = &code, .iov_len = sizeof(code) },
 657     };
 658     size_t niov = 1;
 659     size_t size = iov[0].iov_len;
 660
 661     cpu_to_be16s(&code);
 662
 663     if (reason) {
 664         iov[1].iov_base = (void *)reason;
 665         iov[1].iov_len = strlen(reason);
 666         size += iov[1].iov_len;
 667         niov++;
 668     }
 669     qio_channel_websock_encode(ioc, QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE,
 670                                iov, niov, size);
 671     qio_channel_websock_write_wire(ioc, NULL);
 672     qio_channel_shutdown(ioc->master, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
 673 }
 674
 675
 676 static int qio_channel_websock_decode_header(QIOChannelWebsock *ioc,
 677                                              Error **errp)
 678 {
 679     unsigned char opcode, fin, has_mask;
 680     size_t header_size;
 681     size_t payload_len;
 682     QIOChannelWebsockHeader *header =
 683         (QIOChannelWebsockHeader *)ioc->encinput.buffer;
 684
 685     if (ioc->payload_remain) {
 686         error_setg(errp,
 687                    "Decoding header but %zu bytes of payload remain",
 688                    ioc->payload_remain);
 689         qio_channel_websock_write_close(
 690             ioc, QIO_CHANNEL_WEBSOCK_STATUS_SERVER_ERR,
 691             "internal server error");
 692         return -1;
 693     }
 694     if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT) {
 695         /* header not complete */
 696         return QIO_CHANNEL_ERR_BLOCK;
 697     }
 698
 699     fin = header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN;
 700     opcode = header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE;
 701     has_mask = header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK;
 702     payload_len = header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN;
 703
 704     /* Save or restore opcode. */
 705     if (opcode) {
 706         ioc->opcode = opcode;
 707     } else {
 708         opcode = ioc->opcode;
 709     }
 710
 711     trace_qio_channel_websock_header_partial_decode(ioc, payload_len,
 712                                                     fin, opcode, (int)has_mask);
 713
 714     if (opcode == QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE) {
 715         /* disconnect */
 716         return 0;
 717     }
 718
 719     /* Websocket frame sanity check:
 720      * * Fragmentation is only supported for binary frames.
 721      * * All frames sent by a client MUST be masked.
 722      * * Only binary and ping/pong encoding is supported.
 723      */
 724     if (!fin) {
 725         if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) {
 726             error_setg(errp, "only binary websocket frames may be fragmented");
 727             qio_channel_websock_write_close(
 728                 ioc, QIO_CHANNEL_WEBSOCK_STATUS_POLICY ,
 729                 "only binary frames may be fragmented");
 730             return -1;
 731         }
 732     } else {
 733         if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME &&
 734             opcode != QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE &&
 735             opcode != QIO_CHANNEL_WEBSOCK_OPCODE_PING &&
 736             opcode != QIO_CHANNEL_WEBSOCK_OPCODE_PONG) {
 737             error_setg(errp, "unsupported opcode: %#04x; only binary, close, "
 738                        "ping, and pong websocket frames are supported", opcode);
 739             qio_channel_websock_write_close(
 740                 ioc, QIO_CHANNEL_WEBSOCK_STATUS_INVALID_DATA ,
 741                 "only binary, close, ping, and pong frames are supported");
 742             return -1;
 743         }
 744     }
 745     if (!has_mask) {
 746         error_setg(errp, "client websocket frames must be masked");
 747         qio_channel_websock_write_close(
 748             ioc, QIO_CHANNEL_WEBSOCK_STATUS_PROTOCOL_ERR,
 749             "client frames must be masked");
 750         return -1;
 751     }
 752
 753     if (payload_len < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT) {
 754         ioc->payload_remain = payload_len;
 755         header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
 756         ioc->mask = header->u.m;
 757     } else if (opcode & QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK) {
 758         error_setg(errp, "websocket control frame is too large");
 759         qio_channel_websock_write_close(
 760             ioc, QIO_CHANNEL_WEBSOCK_STATUS_PROTOCOL_ERR,
 761             "control frame is too large");
 762         return -1;
 763     } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT &&
 764                ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT) {
 765         ioc->payload_remain = be16_to_cpu(header->u.s16.l16);
 766         header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
 767         ioc->mask = header->u.s16.m16;
 768     } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT &&
 769                ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT) {
 770         ioc->payload_remain = be64_to_cpu(header->u.s64.l64);
 771         header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
 772         ioc->mask = header->u.s64.m64;
 773     } else {
 774         /* header not complete */
 775         return QIO_CHANNEL_ERR_BLOCK;
 776     }
 777
 778     trace_qio_channel_websock_header_full_decode(
 779         ioc, header_size, ioc->payload_remain, ioc->mask.u);
 780     buffer_advance(&ioc->encinput, header_size);
 781     return 0;
 782 }
 783
 784
 785 static int qio_channel_websock_decode_payload(QIOChannelWebsock *ioc,
 786                                               Error **errp)
 787 {
 788     size_t i;
 789     size_t payload_len = 0;
 790     uint32_t *payload32;
 791
 792     if (ioc->payload_remain) {
 793         /* If we aren't at the end of the payload, then drop
 794          * off the last bytes, so we're always multiple of 4
 795          * for purpose of unmasking, except at end of payload
 796          */
 797         if (ioc->encinput.offset < ioc->payload_remain) {
 798             /* Wait for the entire payload before processing control frames
 799              * because the payload will most likely be echoed back. */
 800             if (ioc->opcode & QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK) {
 801                 return QIO_CHANNEL_ERR_BLOCK;
 802             }
 803             payload_len = ioc->encinput.offset - (ioc->encinput.offset % 4);
 804         } else {
 805             payload_len = ioc->payload_remain;
 806         }
 807         if (payload_len == 0) {
 808             return QIO_CHANNEL_ERR_BLOCK;
 809         }
 810
 811         ioc->payload_remain -= payload_len;
 812
 813         /* unmask frame */
 814         /* process 1 frame (32 bit op) */
 815         payload32 = (uint32_t *)ioc->encinput.buffer;
 816         for (i = 0; i < payload_len / 4; i++) {
 817             payload32[i] ^= ioc->mask.u;
 818         }
 819         /* process the remaining bytes (if any) */
 820         for (i *= 4; i < payload_len; i++) {
 821             ioc->encinput.buffer[i] ^= ioc->mask.c[i % 4];
 822         }
 823     }
 824
 825     trace_qio_channel_websock_payload_decode(
 826         ioc, ioc->opcode, ioc->payload_remain);
 827
 828     if (ioc->opcode == QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) {
 829         if (payload_len) {
 830             /* binary frames are passed on */
 831             buffer_reserve(&ioc->rawinput, payload_len);
 832             buffer_append(&ioc->rawinput, ioc->encinput.buffer, payload_len);
 833         }
 834     } else if (ioc->opcode == QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE) {
 835         /* close frames are echoed back */
 836         error_setg(errp, "websocket closed by peer");
 837         if (payload_len) {
 838             /* echo client status */
 839             struct iovec iov = { .iov_base = ioc->encinput.buffer,
 840                                  .iov_len = ioc->encinput.offset };
 841             qio_channel_websock_encode(ioc, QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE,
 842                                        &iov, 1, iov.iov_len);
 843             qio_channel_websock_write_wire(ioc, NULL);
 844             qio_channel_shutdown(ioc->master, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
 845         } else {
 846             /* send our own status */
 847             qio_channel_websock_write_close(
 848                 ioc, QIO_CHANNEL_WEBSOCK_STATUS_NORMAL, "peer requested close");
 849         }
 850         return -1;
 851     } else if (ioc->opcode == QIO_CHANNEL_WEBSOCK_OPCODE_PING) {
 852         /* ping frames produce an immediate reply, as long as we've not still
 853          * got a previous pong queued, in which case we drop the new pong */
 854         if (ioc->pong_remain == 0) {
 855             struct iovec iov = { .iov_base = ioc->encinput.buffer,
 856                                  .iov_len = ioc->encinput.offset };
 857             qio_channel_websock_encode(ioc, QIO_CHANNEL_WEBSOCK_OPCODE_PONG,
 858                                        &iov, 1, iov.iov_len);
 859             ioc->pong_remain = ioc->encoutput.offset;
 860         }
 861     }   /* pong frames are ignored */
 862
 863     if (payload_len) {
 864         buffer_advance(&ioc->encinput, payload_len);
 865     }
 866     return 0;
 867 }
 868
 869
 870 QIOChannelWebsock *
 871 qio_channel_websock_new_server(QIOChannel *master)
 872 {
 873     QIOChannelWebsock *wioc;
 874     QIOChannel *ioc;
 875
 876     wioc = QIO_CHANNEL_WEBSOCK(object_new(TYPE_QIO_CHANNEL_WEBSOCK));
 877     ioc = QIO_CHANNEL(wioc);
 878
 879     wioc->master = master;
 880     if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
 881         qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
 882     }
 883     object_ref(OBJECT(master));
 884
 885     trace_qio_channel_websock_new_server(wioc, master);
 886     return wioc;
 887 }
 888
 889 void qio_channel_websock_handshake(QIOChannelWebsock *ioc,
 890                                    QIOTaskFunc func,
 891                                    gpointer opaque,
 892                                    GDestroyNotify destroy)
 893 {
 894     QIOTask *task;
 895
 896     task = qio_task_new(OBJECT(ioc),
 897                         func,
 898                         opaque,
 899                         destroy);
 900
 901     trace_qio_channel_websock_handshake_start(ioc);
 902     trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
 903     qio_channel_add_watch(ioc->master,
 904                           G_IO_IN,
 905                           qio_channel_websock_handshake_io,
 906                           task,
 907                           NULL);
 908 }
 909
 910
 911 static void qio_channel_websock_finalize(Object *obj)
 912 {
 913     QIOChannelWebsock *ioc = QIO_CHANNEL_WEBSOCK(obj);
 914
 915     buffer_free(&ioc->encinput);
 916     buffer_free(&ioc->encoutput);
 917     buffer_free(&ioc->rawinput);
 918     object_unref(OBJECT(ioc->master));
 919     if (ioc->io_tag) {
 920         g_source_remove(ioc->io_tag);
 921     }
 922     if (ioc->io_err) {
 923         error_free(ioc->io_err);
 924     }
 925 }
 926
 927
 928 static ssize_t qio_channel_websock_read_wire(QIOChannelWebsock *ioc,
 929                                              Error **errp)
 930 {
 931     ssize_t ret;
 932
 933     if (ioc->encinput.offset < 4096) {
 934         size_t want = 4096 - ioc->encinput.offset;
 935
 936         buffer_reserve(&ioc->encinput, want);
 937         ret = qio_channel_read(ioc->master,
 938                                (char *)ioc->encinput.buffer +
 939                                ioc->encinput.offset,
 940                                want,
 941                                errp);
 942         if (ret < 0) {
 943             return ret;
 944         }
 945         if (ret == 0 && ioc->encinput.offset == 0) {
 946             ioc->io_eof = TRUE;
 947             return 0;
 948         }
 949         ioc->encinput.offset += ret;
 950     }
 951
 952     while (ioc->encinput.offset != 0) {
 953         if (ioc->payload_remain == 0) {
 954             ret = qio_channel_websock_decode_header(ioc, errp);
 955             if (ret < 0) {
 956                 return ret;
 957             }
 958         }
 959
 960         ret = qio_channel_websock_decode_payload(ioc, errp);
 961         if (ret < 0) {
 962             return ret;
 963         }
 964     }
 965     return 1;
 966 }
 967
 968
 969 static ssize_t qio_channel_websock_write_wire(QIOChannelWebsock *ioc,
 970                                               Error **errp)
 971 {
 972     ssize_t ret;
 973     ssize_t done = 0;
 974
 975     while (ioc->encoutput.offset > 0) {
 976         ret = qio_channel_write(ioc->master,
 977                                 (char *)ioc->encoutput.buffer,
 978                                 ioc->encoutput.offset,
 979                                 errp);
 980         if (ret < 0) {
 981             if (ret == QIO_CHANNEL_ERR_BLOCK &&
 982                 done > 0) {
 983                 return done;
 984             } else {
 985                 return ret;
 986             }
 987         }
 988         buffer_advance(&ioc->encoutput, ret);
 989         done += ret;
 990         if (ioc->pong_remain < ret) {
 991             ioc->pong_remain = 0;
 992         } else {
 993             ioc->pong_remain -= ret;
 994         }
 995     }
 996     return done;
 997 }
 998
 999
1000 static void qio_channel_websock_flush_free(gpointer user_data)
1001 {
1002     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data);
1003     object_unref(OBJECT(wioc));
1004 }
1005
1006 static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc);
1007
1008 static gboolean qio_channel_websock_flush(QIOChannel *ioc,
1009                                           GIOCondition condition,
1010                                           gpointer user_data)
1011 {
1012     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data);
1013     ssize_t ret;
1014
1015     if (condition & G_IO_OUT) {
1016         ret = qio_channel_websock_write_wire(wioc, &wioc->io_err);
1017         if (ret < 0) {
1018             goto cleanup;
1019         }
1020     }
1021
1022     if (condition & G_IO_IN) {
1023         ret = qio_channel_websock_read_wire(wioc, &wioc->io_err);
1024         if (ret < 0) {
1025             goto cleanup;
1026         }
1027     }
1028
1029  cleanup:
1030     qio_channel_websock_set_watch(wioc);
1031     return FALSE;
1032 }
1033
1034
1035 static void qio_channel_websock_unset_watch(QIOChannelWebsock *ioc)
1036 {
1037     if (ioc->io_tag) {
1038         g_source_remove(ioc->io_tag);
1039         ioc->io_tag = 0;
1040     }
1041 }
1042
1043 static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc)
1044 {
1045     GIOCondition cond = 0;
1046
1047     qio_channel_websock_unset_watch(ioc);
1048
1049     if (ioc->io_err) {
1050         return;
1051     }
1052
1053     if (ioc->encoutput.offset) {
1054         cond |= G_IO_OUT;
1055     }
1056     if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER &&
1057         !ioc->io_eof) {
1058         cond |= G_IO_IN;
1059     }
1060
1061     if (cond) {
1062         object_ref(OBJECT(ioc));
1063         ioc->io_tag =
1064             qio_channel_add_watch(ioc->master,
1065                                   cond,
1066                                   qio_channel_websock_flush,
1067                                   ioc,
1068                                   qio_channel_websock_flush_free);
1069     }
1070 }
1071
1072
1073 static ssize_t qio_channel_websock_readv(QIOChannel *ioc,
1074                                          const struct iovec *iov,
1075                                          size_t niov,
1076                                          int **fds,
1077                                          size_t *nfds,
1078                                          Error **errp)
1079 {
1080     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
1081     size_t i;
1082     ssize_t got = 0;
1083     ssize_t ret;
1084
1085     if (wioc->io_err) {
1086         error_propagate(errp, error_copy(wioc->io_err));
1087         return -1;
1088     }
1089
1090     if (!wioc->rawinput.offset) {
1091         ret = qio_channel_websock_read_wire(QIO_CHANNEL_WEBSOCK(ioc), errp);
1092         if (ret < 0) {
1093             return ret;
1094         }
1095     }
1096
1097     for (i = 0 ; i < niov ; i++) {
1098         size_t want = iov[i].iov_len;
1099         if (want > (wioc->rawinput.offset - got)) {
1100             want = (wioc->rawinput.offset - got);
1101         }
1102
1103         memcpy(iov[i].iov_base,
1104                wioc->rawinput.buffer + got,
1105                want);
1106         got += want;
1107
1108         if (want < iov[i].iov_len) {
1109             break;
1110         }
1111     }
1112
1113     buffer_advance(&wioc->rawinput, got);
1114     qio_channel_websock_set_watch(wioc);
1115     return got;
1116 }
1117
1118
1119 static ssize_t qio_channel_websock_writev(QIOChannel *ioc,
1120                                           const struct iovec *iov,
1121                                           size_t niov,
1122                                           int *fds,
1123                                           size_t nfds,
1124                                           Error **errp)
1125 {
1126     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
1127     ssize_t want = iov_size(iov, niov);
1128     ssize_t avail;
1129     ssize_t ret;
1130
1131     if (wioc->io_err) {
1132         error_propagate(errp, error_copy(wioc->io_err));
1133         return -1;
1134     }
1135
1136     if (wioc->io_eof) {
1137         error_setg(errp, "%s", "Broken pipe");
1138         return -1;
1139     }
1140
1141     avail = wioc->encoutput.offset >= QIO_CHANNEL_WEBSOCK_MAX_BUFFER ?
1142         0 : (QIO_CHANNEL_WEBSOCK_MAX_BUFFER - wioc->encoutput.offset);
1143     if (want > avail) {
1144         want = avail;
1145     }
1146
1147     if (want) {
1148         qio_channel_websock_encode(wioc,
1149                                    QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME,
1150                                    iov, niov, want);
1151     }
1152
1153     /* Even if want == 0, we'll try write_wire in case there's
1154      * pending data we could usefully flush out
1155      */
1156     ret = qio_channel_websock_write_wire(wioc, errp);
1157     if (ret < 0 &&
1158         ret != QIO_CHANNEL_ERR_BLOCK) {
1159         qio_channel_websock_unset_watch(wioc);
1160         return -1;
1161     }
1162
1163     qio_channel_websock_set_watch(wioc);
1164
1165     if (want == 0) {
1166         return QIO_CHANNEL_ERR_BLOCK;
1167     }
1168
1169     return want;
1170 }
1171
1172 static int qio_channel_websock_set_blocking(QIOChannel *ioc,
1173                                             bool enabled,
1174                                             Error **errp)
1175 {
1176     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
1177
1178     qio_channel_set_blocking(wioc->master, enabled, errp);
1179     return 0;
1180 }
1181
1182 static void qio_channel_websock_set_delay(QIOChannel *ioc,
1183                                           bool enabled)
1184 {
1185     QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);
1186
1187     qio_channel_set_delay(tioc->master, enabled);
1188 }
1189
1190 static void qio_channel_websock_set_cork(QIOChannel *ioc,
1191                                          bool enabled)
1192 {
1193     QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);
1194
1195     qio_channel_set_cork(tioc->master, enabled);
1196 }
1197
1198 static int qio_channel_websock_shutdown(QIOChannel *ioc,
1199                                         QIOChannelShutdown how,
1200                                         Error **errp)
1201 {
1202     QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);
1203
1204     return qio_channel_shutdown(tioc->master, how, errp);
1205 }
1206
1207 static int qio_channel_websock_close(QIOChannel *ioc,
1208                                      Error **errp)
1209 {
1210     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
1211
1212     trace_qio_channel_websock_close(ioc);
1213     return qio_channel_close(wioc->master, errp);
1214 }
1215
1216 typedef struct QIOChannelWebsockSource QIOChannelWebsockSource;
1217 struct QIOChannelWebsockSource {
1218     GSource parent;
1219     QIOChannelWebsock *wioc;
1220     GIOCondition condition;
1221 };
1222
1223 static gboolean
1224 qio_channel_websock_source_check(GSource *source)
1225 {
1226     QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
1227     GIOCondition cond = 0;
1228
1229     if (wsource->wioc->rawinput.offset || wsource->wioc->io_eof) {
1230         cond |= G_IO_IN;
1231     }
1232     if (wsource->wioc->encoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
1233         cond |= G_IO_OUT;
1234     }
1235
1236     return cond & wsource->condition;
1237 }
1238
1239 static gboolean
1240 qio_channel_websock_source_prepare(GSource *source,
1241                                    gint *timeout)
1242 {
1243     *timeout = -1;
1244     return qio_channel_websock_source_check(source);
1245 }
1246
1247 static gboolean
1248 qio_channel_websock_source_dispatch(GSource *source,
1249                                     GSourceFunc callback,
1250                                     gpointer user_data)
1251 {
1252     QIOChannelFunc func = (QIOChannelFunc)callback;
1253     QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
1254
1255     return (*func)(QIO_CHANNEL(wsource->wioc),
1256                    qio_channel_websock_source_check(source),
1257                    user_data);
1258 }
1259
1260 static void
1261 qio_channel_websock_source_finalize(GSource *source)
1262 {
1263     QIOChannelWebsockSource *ssource = (QIOChannelWebsockSource *)source;
1264
1265     object_unref(OBJECT(ssource->wioc));
1266 }
1267
1268 GSourceFuncs qio_channel_websock_source_funcs = {
1269     qio_channel_websock_source_prepare,
1270     qio_channel_websock_source_check,
1271     qio_channel_websock_source_dispatch,
1272     qio_channel_websock_source_finalize
1273 };
1274
1275 static GSource *qio_channel_websock_create_watch(QIOChannel *ioc,
1276                                                  GIOCondition condition)
1277 {
1278     QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
1279     QIOChannelWebsockSource *ssource;
1280     GSource *source;
1281
1282     source = g_source_new(&qio_channel_websock_source_funcs,
1283                           sizeof(QIOChannelWebsockSource));
1284     ssource = (QIOChannelWebsockSource *)source;
1285
1286     ssource->wioc = wioc;
1287     object_ref(OBJECT(wioc));
1288
1289     ssource->condition = condition;
1290
1291     qio_channel_websock_set_watch(wioc);
1292     return source;
1293 }
1294
1295 static void qio_channel_websock_class_init(ObjectClass *klass,
1296                                            void *class_data G_GNUC_UNUSED)
1297 {
1298     QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
1299
1300     ioc_klass->io_writev = qio_channel_websock_writev;
1301     ioc_klass->io_readv = qio_channel_websock_readv;
1302     ioc_klass->io_set_blocking = qio_channel_websock_set_blocking;
1303     ioc_klass->io_set_cork = qio_channel_websock_set_cork;
1304     ioc_klass->io_set_delay = qio_channel_websock_set_delay;
1305     ioc_klass->io_close = qio_channel_websock_close;
1306     ioc_klass->io_shutdown = qio_channel_websock_shutdown;
1307     ioc_klass->io_create_watch = qio_channel_websock_create_watch;
1308 }
1309
1310 static const TypeInfo qio_channel_websock_info = {
1311     .parent = TYPE_QIO_CHANNEL,
1312     .name = TYPE_QIO_CHANNEL_WEBSOCK,
1313     .instance_size = sizeof(QIOChannelWebsock),
1314     .instance_finalize = qio_channel_websock_finalize,
1315     .class_init = qio_channel_websock_class_init,
1316 };
1317
1318 static void qio_channel_websock_register_types(void)
1319 {
1320     type_register_static(&qio_channel_websock_info);
1321 }
1322
1323 type_init(qio_channel_websock_register_types);