channel-websock.c 33 KB
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/*
 * QEMU I/O channels driver websockets
 *
 * Copyright (c) 2015 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 */

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Peter Maydell committed
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/bswap.h"
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#include "io/channel-websock.h"
#include "crypto/hash.h"
#include "trace.h"


/* Max amount to allow in rawinput/rawoutput buffers */
#define QIO_CHANNEL_WEBSOCK_MAX_BUFFER 8192

#define QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN 24
#define QIO_CHANNEL_WEBSOCK_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
#define QIO_CHANNEL_WEBSOCK_GUID_LEN strlen(QIO_CHANNEL_WEBSOCK_GUID)

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#define QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL "sec-websocket-protocol"
#define QIO_CHANNEL_WEBSOCK_HEADER_VERSION "sec-websocket-version"
#define QIO_CHANNEL_WEBSOCK_HEADER_KEY "sec-websocket-key"
#define QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE "upgrade"
#define QIO_CHANNEL_WEBSOCK_HEADER_HOST "host"
#define QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION "connection"
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#define QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY "binary"
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#define QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE "Upgrade"
#define QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET "websocket"
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#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RESPONSE  \
    "HTTP/1.1 101 Switching Protocols\r\n"      \
    "Upgrade: websocket\r\n"                    \
    "Connection: Upgrade\r\n"                   \
    "Sec-WebSocket-Accept: %s\r\n"              \
    "Sec-WebSocket-Protocol: binary\r\n"        \
    "\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM "\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_END "\r\n\r\n"
#define QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION "13"
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#define QIO_CHANNEL_WEBSOCK_HTTP_METHOD "GET"
#define QIO_CHANNEL_WEBSOCK_HTTP_PATH "/"
#define QIO_CHANNEL_WEBSOCK_HTTP_VERSION "HTTP/1.1"
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/* The websockets packet header is variable length
 * depending on the size of the payload... */

/* ...length when using 7-bit payload length */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT 6
/* ...length when using 16-bit payload length */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT 8
/* ...length when using 64-bit payload length */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT 14

/* Length of the optional data mask field in header */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK 4

/* Maximum length that can fit in 7-bit payload size */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT 126
/* Maximum length that can fit in 16-bit payload size */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT 65536

/* Magic 7-bit length to indicate use of 16-bit payload length */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT 126
/* Magic 7-bit length to indicate use of 64-bit payload length */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT 127

/* Bitmasks & shifts for accessing header fields */
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN 0x80
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE 0x0f
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK 0x80
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN 0x7f
#define QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN 7
#define QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_HAS_MASK 7

typedef struct QIOChannelWebsockHeader QIOChannelWebsockHeader;

struct QEMU_PACKED QIOChannelWebsockHeader {
    unsigned char b0;
    unsigned char b1;
    union {
        struct QEMU_PACKED {
            uint16_t l16;
            QIOChannelWebsockMask m16;
        } s16;
        struct QEMU_PACKED {
            uint64_t l64;
            QIOChannelWebsockMask m64;
        } s64;
        QIOChannelWebsockMask m;
    } u;
};

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typedef struct QIOChannelWebsockHTTPHeader QIOChannelWebsockHTTPHeader;

struct QIOChannelWebsockHTTPHeader {
    char *name;
    char *value;
};

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enum {
    QIO_CHANNEL_WEBSOCK_OPCODE_CONTINUATION = 0x0,
    QIO_CHANNEL_WEBSOCK_OPCODE_TEXT_FRAME = 0x1,
    QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME = 0x2,
    QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE = 0x8,
    QIO_CHANNEL_WEBSOCK_OPCODE_PING = 0x9,
    QIO_CHANNEL_WEBSOCK_OPCODE_PONG = 0xA
};

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static size_t
qio_channel_websock_extract_headers(char *buffer,
                                    QIOChannelWebsockHTTPHeader *hdrs,
                                    size_t nhdrsalloc,
                                    Error **errp)
{
    char *nl, *sep, *tmp;
    size_t nhdrs = 0;

    /*
     * First parse the HTTP protocol greeting of format:
     *
     *   $METHOD $PATH $VERSION
     *
     * e.g.
     *
     *   GET / HTTP/1.1
     */

    nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
    if (!nl) {
        error_setg(errp, "Missing HTTP header delimiter");
        return 0;
    }
    *nl = '\0';

    tmp = strchr(buffer, ' ');
    if (!tmp) {
        error_setg(errp, "Missing HTTP path delimiter");
        return 0;
    }
    *tmp = '\0';

    if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_METHOD)) {
        error_setg(errp, "Unsupported HTTP method %s", buffer);
        return 0;
    }

    buffer = tmp + 1;
    tmp = strchr(buffer, ' ');
    if (!tmp) {
        error_setg(errp, "Missing HTTP version delimiter");
        return 0;
    }
    *tmp = '\0';

    if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_PATH)) {
        error_setg(errp, "Unexpected HTTP path %s", buffer);
        return 0;
    }

    buffer = tmp + 1;

    if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_VERSION)) {
        error_setg(errp, "Unsupported HTTP version %s", buffer);
        return 0;
    }

    buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);

    /*
     * Now parse all the header fields of format
     *
     *   $NAME: $VALUE
     *
     * e.g.
     *
     *   Cache-control: no-cache
     */
    do {
        QIOChannelWebsockHTTPHeader *hdr;

        nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
        if (nl) {
            *nl = '\0';
        }

        sep = strchr(buffer, ':');
        if (!sep) {
            error_setg(errp, "Malformed HTTP header");
            return 0;
        }
        *sep = '\0';
        sep++;
        while (*sep == ' ') {
            sep++;
        }

        if (nhdrs >= nhdrsalloc) {
            error_setg(errp, "Too many HTTP headers");
            return 0;
        }

        hdr = &hdrs[nhdrs++];
        hdr->name = buffer;
        hdr->value = sep;

        /* Canonicalize header name for easier identification later */
        for (tmp = hdr->name; *tmp; tmp++) {
            *tmp = g_ascii_tolower(*tmp);
        }

        if (nl) {
            buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
        }
    } while (nl != NULL);

    return nhdrs;
}

static const char *
qio_channel_websock_find_header(QIOChannelWebsockHTTPHeader *hdrs,
                                size_t nhdrs,
                                const char *name)
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{
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    size_t i;

    for (i = 0; i < nhdrs; i++) {
        if (g_str_equal(hdrs[i].name, name)) {
            return hdrs[i].value;
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        }
    }
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    return NULL;
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}


static int qio_channel_websock_handshake_send_response(QIOChannelWebsock *ioc,
                                                       const char *key,
                                                       Error **errp)
{
    char combined_key[QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
                      QIO_CHANNEL_WEBSOCK_GUID_LEN + 1];
    char *accept = NULL, *response = NULL;
    size_t responselen;

    g_strlcpy(combined_key, key, QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + 1);
    g_strlcat(combined_key, QIO_CHANNEL_WEBSOCK_GUID,
              QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
              QIO_CHANNEL_WEBSOCK_GUID_LEN + 1);

    /* hash and encode it */
    if (qcrypto_hash_base64(QCRYPTO_HASH_ALG_SHA1,
                            combined_key,
                            QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
                            QIO_CHANNEL_WEBSOCK_GUID_LEN,
                            &accept,
                            errp) < 0) {
        return -1;
    }

    response = g_strdup_printf(QIO_CHANNEL_WEBSOCK_HANDSHAKE_RESPONSE, accept);
    responselen = strlen(response);
    buffer_reserve(&ioc->encoutput, responselen);
    buffer_append(&ioc->encoutput, response, responselen);

    g_free(accept);
    g_free(response);

    return 0;
}

static int qio_channel_websock_handshake_process(QIOChannelWebsock *ioc,
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                                                 char *buffer,
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                                                 Error **errp)
{
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    QIOChannelWebsockHTTPHeader hdrs[32];
    size_t nhdrs = G_N_ELEMENTS(hdrs);
    const char *protocols = NULL, *version = NULL, *key = NULL,
        *host = NULL, *connection = NULL, *upgrade = NULL;
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    nhdrs = qio_channel_websock_extract_headers(buffer, hdrs, nhdrs, errp);
    if (!nhdrs) {
        return -1;
    }

    protocols = qio_channel_websock_find_header(
        hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL);
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    if (!protocols) {
        error_setg(errp, "Missing websocket protocol header data");
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        return -1;
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    }

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    version = qio_channel_websock_find_header(
        hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_VERSION);
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    if (!version) {
        error_setg(errp, "Missing websocket version header data");
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        return -1;
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    }

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    key = qio_channel_websock_find_header(
        hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_KEY);
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    if (!key) {
        error_setg(errp, "Missing websocket key header data");
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        return -1;
    }

    host = qio_channel_websock_find_header(
        hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_HOST);
    if (!host) {
        error_setg(errp, "Missing websocket host header data");
        return -1;
    }

    connection = qio_channel_websock_find_header(
        hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION);
    if (!connection) {
        error_setg(errp, "Missing websocket connection header data");
        return -1;
    }

    upgrade = qio_channel_websock_find_header(
        hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE);
    if (!upgrade) {
        error_setg(errp, "Missing websocket upgrade header data");
        return -1;
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    }

    if (!g_strrstr(protocols, QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY)) {
        error_setg(errp, "No '%s' protocol is supported by client '%s'",
                   QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY, protocols);
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        return -1;
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    }

    if (!g_str_equal(version, QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION)) {
        error_setg(errp, "Version '%s' is not supported by client '%s'",
                   QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION, version);
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        return -1;
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    }

    if (strlen(key) != QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN) {
        error_setg(errp, "Key length '%zu' was not as expected '%d'",
                   strlen(key), QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN);
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        return -1;
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    }

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    if (!g_strrstr(connection, QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE)) {
        error_setg(errp, "No connection upgrade requested '%s'", connection);
        return -1;
    }

    if (!g_str_equal(upgrade, QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET)) {
        error_setg(errp, "Incorrect upgrade method '%s'", upgrade);
        return -1;
    }
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    return qio_channel_websock_handshake_send_response(ioc, key, errp);
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}

static int qio_channel_websock_handshake_read(QIOChannelWebsock *ioc,
                                              Error **errp)
{
    char *handshake_end;
    ssize_t ret;
    /* Typical HTTP headers from novnc are 512 bytes, so limiting
     * total header size to 4096 is easily enough. */
    size_t want = 4096 - ioc->encinput.offset;
    buffer_reserve(&ioc->encinput, want);
    ret = qio_channel_read(ioc->master,
                           (char *)buffer_end(&ioc->encinput), want, errp);
    if (ret < 0) {
        return -1;
    }
    ioc->encinput.offset += ret;

    handshake_end = g_strstr_len((char *)ioc->encinput.buffer,
                                 ioc->encinput.offset,
                                 QIO_CHANNEL_WEBSOCK_HANDSHAKE_END);
    if (!handshake_end) {
        if (ioc->encinput.offset >= 4096) {
            error_setg(errp,
                       "End of headers not found in first 4096 bytes");
            return -1;
        } else {
            return 0;
        }
    }
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    *handshake_end = '\0';
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    if (qio_channel_websock_handshake_process(ioc,
                                              (char *)ioc->encinput.buffer,
                                              errp) < 0) {
        return -1;
    }

    buffer_advance(&ioc->encinput,
                   handshake_end - (char *)ioc->encinput.buffer +
                   strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_END));
    return 1;
}

static gboolean qio_channel_websock_handshake_send(QIOChannel *ioc,
                                                   GIOCondition condition,
                                                   gpointer user_data)
{
    QIOTask *task = user_data;
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
        qio_task_get_source(task));
    Error *err = NULL;
    ssize_t ret;

    ret = qio_channel_write(wioc->master,
                            (char *)wioc->encoutput.buffer,
                            wioc->encoutput.offset,
                            &err);

    if (ret < 0) {
        trace_qio_channel_websock_handshake_fail(ioc);
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        qio_task_set_error(task, err);
        qio_task_complete(task);
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        return FALSE;
    }

    buffer_advance(&wioc->encoutput, ret);
    if (wioc->encoutput.offset == 0) {
        trace_qio_channel_websock_handshake_complete(ioc);
        qio_task_complete(task);
        return FALSE;
    }
    trace_qio_channel_websock_handshake_pending(ioc, G_IO_OUT);
    return TRUE;
}

static gboolean qio_channel_websock_handshake_io(QIOChannel *ioc,
                                                 GIOCondition condition,
                                                 gpointer user_data)
{
    QIOTask *task = user_data;
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
        qio_task_get_source(task));
    Error *err = NULL;
    int ret;

    ret = qio_channel_websock_handshake_read(wioc, &err);
    if (ret < 0) {
        trace_qio_channel_websock_handshake_fail(ioc);
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        qio_task_set_error(task, err);
        qio_task_complete(task);
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        return FALSE;
    }
    if (ret == 0) {
        trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
        /* need more data still */
        return TRUE;
    }

    trace_qio_channel_websock_handshake_reply(ioc);
    qio_channel_add_watch(
        wioc->master,
        G_IO_OUT,
        qio_channel_websock_handshake_send,
        task,
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        NULL);
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    return FALSE;
}


static void qio_channel_websock_encode(QIOChannelWebsock *ioc)
{
    size_t header_size;
    union {
        char buf[QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT];
        QIOChannelWebsockHeader ws;
    } header;

    if (!ioc->rawoutput.offset) {
        return;
    }

    header.ws.b0 = (1 << QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN) |
        (QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME &
         QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE);
    if (ioc->rawoutput.offset <
        QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT) {
        header.ws.b1 = (uint8_t)ioc->rawoutput.offset;
        header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
    } else if (ioc->rawoutput.offset <
               QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT) {
        header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT;
        header.ws.u.s16.l16 = cpu_to_be16((uint16_t)ioc->rawoutput.offset);
        header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
    } else {
        header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT;
        header.ws.u.s64.l64 = cpu_to_be64(ioc->rawoutput.offset);
        header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
    }
    header_size -= QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK;

    buffer_reserve(&ioc->encoutput, header_size + ioc->rawoutput.offset);
    buffer_append(&ioc->encoutput, header.buf, header_size);
    buffer_append(&ioc->encoutput, ioc->rawoutput.buffer,
                  ioc->rawoutput.offset);
    buffer_reset(&ioc->rawoutput);
}


static ssize_t qio_channel_websock_decode_header(QIOChannelWebsock *ioc,
                                                 Error **errp)
{
    unsigned char opcode, fin, has_mask;
    size_t header_size;
    size_t payload_len;
    QIOChannelWebsockHeader *header =
        (QIOChannelWebsockHeader *)ioc->encinput.buffer;

    if (ioc->payload_remain) {
        error_setg(errp,
                   "Decoding header but %zu bytes of payload remain",
                   ioc->payload_remain);
        return -1;
    }
    if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT) {
        /* header not complete */
        return QIO_CHANNEL_ERR_BLOCK;
    }

    fin = (header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN) >>
        QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN;
    opcode = header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE;
    has_mask = (header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK) >>
        QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_HAS_MASK;
    payload_len = header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN;

    if (opcode == QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE) {
        /* disconnect */
        return 0;
    }

    /* Websocket frame sanity check:
     * * Websocket fragmentation is not supported.
     * * All  websockets frames sent by a client have to be masked.
     * * Only binary encoding is supported.
     */
    if (!fin) {
        error_setg(errp, "websocket fragmentation is not supported");
        return -1;
    }
    if (!has_mask) {
        error_setg(errp, "websocket frames must be masked");
        return -1;
    }
    if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) {
        error_setg(errp, "only binary websocket frames are supported");
        return -1;
    }

    if (payload_len < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT) {
        ioc->payload_remain = payload_len;
        header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
        ioc->mask = header->u.m;
    } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT &&
               ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT) {
        ioc->payload_remain = be16_to_cpu(header->u.s16.l16);
        header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
        ioc->mask = header->u.s16.m16;
    } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT &&
               ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT) {
        ioc->payload_remain = be64_to_cpu(header->u.s64.l64);
        header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
        ioc->mask = header->u.s64.m64;
    } else {
        /* header not complete */
        return QIO_CHANNEL_ERR_BLOCK;
    }

    buffer_advance(&ioc->encinput, header_size);
    return 1;
}


static ssize_t qio_channel_websock_decode_payload(QIOChannelWebsock *ioc,
                                                  Error **errp)
{
    size_t i;
    size_t payload_len;
    uint32_t *payload32;

    if (!ioc->payload_remain) {
        error_setg(errp,
                   "Decoding payload but no bytes of payload remain");
        return -1;
    }

    /* If we aren't at the end of the payload, then drop
     * off the last bytes, so we're always multiple of 4
     * for purpose of unmasking, except at end of payload
     */
    if (ioc->encinput.offset < ioc->payload_remain) {
        payload_len = ioc->encinput.offset - (ioc->encinput.offset % 4);
    } else {
        payload_len = ioc->payload_remain;
    }
    if (payload_len == 0) {
        return QIO_CHANNEL_ERR_BLOCK;
    }

    ioc->payload_remain -= payload_len;

    /* unmask frame */
    /* process 1 frame (32 bit op) */
    payload32 = (uint32_t *)ioc->encinput.buffer;
    for (i = 0; i < payload_len / 4; i++) {
        payload32[i] ^= ioc->mask.u;
    }
    /* process the remaining bytes (if any) */
    for (i *= 4; i < payload_len; i++) {
        ioc->encinput.buffer[i] ^= ioc->mask.c[i % 4];
    }

    buffer_reserve(&ioc->rawinput, payload_len);
    buffer_append(&ioc->rawinput, ioc->encinput.buffer, payload_len);
    buffer_advance(&ioc->encinput, payload_len);
    return payload_len;
}


QIOChannelWebsock *
qio_channel_websock_new_server(QIOChannel *master)
{
    QIOChannelWebsock *wioc;
    QIOChannel *ioc;

    wioc = QIO_CHANNEL_WEBSOCK(object_new(TYPE_QIO_CHANNEL_WEBSOCK));
    ioc = QIO_CHANNEL(wioc);

    wioc->master = master;
652
    if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
653
        qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
    }
    object_ref(OBJECT(master));

    trace_qio_channel_websock_new_server(wioc, master);
    return wioc;
}

void qio_channel_websock_handshake(QIOChannelWebsock *ioc,
                                   QIOTaskFunc func,
                                   gpointer opaque,
                                   GDestroyNotify destroy)
{
    QIOTask *task;

    task = qio_task_new(OBJECT(ioc),
                        func,
                        opaque,
                        destroy);

    trace_qio_channel_websock_handshake_start(ioc);
    trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
    qio_channel_add_watch(ioc->master,
                          G_IO_IN,
                          qio_channel_websock_handshake_io,
                          task,
                          NULL);
}


static void qio_channel_websock_finalize(Object *obj)
{
    QIOChannelWebsock *ioc = QIO_CHANNEL_WEBSOCK(obj);

    buffer_free(&ioc->encinput);
    buffer_free(&ioc->encoutput);
    buffer_free(&ioc->rawinput);
    buffer_free(&ioc->rawoutput);
    object_unref(OBJECT(ioc->master));
    if (ioc->io_tag) {
        g_source_remove(ioc->io_tag);
    }
    if (ioc->io_err) {
        error_free(ioc->io_err);
    }
}


static ssize_t qio_channel_websock_read_wire(QIOChannelWebsock *ioc,
                                             Error **errp)
{
    ssize_t ret;

    if (ioc->encinput.offset < 4096) {
        size_t want = 4096 - ioc->encinput.offset;

        buffer_reserve(&ioc->encinput, want);
        ret = qio_channel_read(ioc->master,
                               (char *)ioc->encinput.buffer +
                               ioc->encinput.offset,
                               want,
                               errp);
        if (ret < 0) {
            return ret;
        }
        if (ret == 0 &&
            ioc->encinput.offset == 0) {
            return 0;
        }
        ioc->encinput.offset += ret;
    }

725 726 727 728 729 730 731 732 733 734 735 736 737
    while (ioc->encinput.offset != 0) {
        if (ioc->payload_remain == 0) {
            ret = qio_channel_websock_decode_header(ioc, errp);
            if (ret < 0) {
                return ret;
            }
            if (ret == 0) {
                ioc->io_eof = TRUE;
                break;
            }
        }

        ret = qio_channel_websock_decode_payload(ioc, errp);
738 739 740 741
        if (ret < 0) {
            return ret;
        }
    }
742
    return 1;
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}


static ssize_t qio_channel_websock_write_wire(QIOChannelWebsock *ioc,
                                              Error **errp)
{
    ssize_t ret;
    ssize_t done = 0;
    qio_channel_websock_encode(ioc);

    while (ioc->encoutput.offset > 0) {
        ret = qio_channel_write(ioc->master,
                                (char *)ioc->encoutput.buffer,
                                ioc->encoutput.offset,
                                errp);
        if (ret < 0) {
            if (ret == QIO_CHANNEL_ERR_BLOCK &&
                done > 0) {
                return done;
            } else {
                return ret;
            }
        }
        buffer_advance(&ioc->encoutput, ret);
        done += ret;
    }
    return done;
}


static void qio_channel_websock_flush_free(gpointer user_data)
{
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data);
    object_unref(OBJECT(wioc));
}

static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc);

static gboolean qio_channel_websock_flush(QIOChannel *ioc,
                                          GIOCondition condition,
                                          gpointer user_data)
{
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data);
    ssize_t ret;

    if (condition & G_IO_OUT) {
        ret = qio_channel_websock_write_wire(wioc, &wioc->io_err);
        if (ret < 0) {
            goto cleanup;
        }
    }

    if (condition & G_IO_IN) {
        ret = qio_channel_websock_read_wire(wioc, &wioc->io_err);
        if (ret < 0) {
            goto cleanup;
        }
    }

 cleanup:
    qio_channel_websock_set_watch(wioc);
    return FALSE;
}


static void qio_channel_websock_unset_watch(QIOChannelWebsock *ioc)
{
    if (ioc->io_tag) {
        g_source_remove(ioc->io_tag);
        ioc->io_tag = 0;
    }
}

static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc)
{
    GIOCondition cond = 0;

    qio_channel_websock_unset_watch(ioc);

    if (ioc->io_err) {
        return;
    }

    if (ioc->encoutput.offset) {
        cond |= G_IO_OUT;
    }
    if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER &&
        !ioc->io_eof) {
        cond |= G_IO_IN;
    }

    if (cond) {
        object_ref(OBJECT(ioc));
        ioc->io_tag =
            qio_channel_add_watch(ioc->master,
                                  cond,
                                  qio_channel_websock_flush,
                                  ioc,
                                  qio_channel_websock_flush_free);
    }
}


static ssize_t qio_channel_websock_readv(QIOChannel *ioc,
                                         const struct iovec *iov,
                                         size_t niov,
                                         int **fds,
                                         size_t *nfds,
                                         Error **errp)
{
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
    size_t i;
    ssize_t got = 0;
    ssize_t ret;

    if (wioc->io_err) {
        *errp = error_copy(wioc->io_err);
        return -1;
    }

    if (!wioc->rawinput.offset) {
        ret = qio_channel_websock_read_wire(QIO_CHANNEL_WEBSOCK(ioc), errp);
        if (ret < 0) {
            return ret;
        }
    }

    for (i = 0 ; i < niov ; i++) {
        size_t want = iov[i].iov_len;
        if (want > (wioc->rawinput.offset - got)) {
            want = (wioc->rawinput.offset - got);
        }

        memcpy(iov[i].iov_base,
               wioc->rawinput.buffer + got,
               want);
        got += want;

        if (want < iov[i].iov_len) {
            break;
        }
    }

    buffer_advance(&wioc->rawinput, got);
    qio_channel_websock_set_watch(wioc);
    return got;
}


static ssize_t qio_channel_websock_writev(QIOChannel *ioc,
                                          const struct iovec *iov,
                                          size_t niov,
                                          int *fds,
                                          size_t nfds,
                                          Error **errp)
{
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
    size_t i;
    ssize_t done = 0;
    ssize_t ret;

    if (wioc->io_err) {
        *errp = error_copy(wioc->io_err);
        return -1;
    }

    if (wioc->io_eof) {
        error_setg(errp, "%s", "Broken pipe");
        return -1;
    }

    for (i = 0; i < niov; i++) {
        size_t want = iov[i].iov_len;
        if ((want + wioc->rawoutput.offset) > QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
            want = (QIO_CHANNEL_WEBSOCK_MAX_BUFFER - wioc->rawoutput.offset);
        }
        if (want == 0) {
            goto done;
        }

        buffer_reserve(&wioc->rawoutput, want);
        buffer_append(&wioc->rawoutput, iov[i].iov_base, want);
        done += want;
        if (want < iov[i].iov_len) {
            break;
        }
    }

 done:
    ret = qio_channel_websock_write_wire(wioc, errp);
    if (ret < 0 &&
        ret != QIO_CHANNEL_ERR_BLOCK) {
        qio_channel_websock_unset_watch(wioc);
        return -1;
    }

    qio_channel_websock_set_watch(wioc);

    if (done == 0) {
        return QIO_CHANNEL_ERR_BLOCK;
    }

    return done;
}

static int qio_channel_websock_set_blocking(QIOChannel *ioc,
                                            bool enabled,
                                            Error **errp)
{
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);

    qio_channel_set_blocking(wioc->master, enabled, errp);
    return 0;
}

static void qio_channel_websock_set_delay(QIOChannel *ioc,
                                          bool enabled)
{
    QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);

    qio_channel_set_delay(tioc->master, enabled);
}

static void qio_channel_websock_set_cork(QIOChannel *ioc,
                                         bool enabled)
{
    QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);

    qio_channel_set_cork(tioc->master, enabled);
}

static int qio_channel_websock_shutdown(QIOChannel *ioc,
                                        QIOChannelShutdown how,
                                        Error **errp)
{
    QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);

    return qio_channel_shutdown(tioc->master, how, errp);
}

static int qio_channel_websock_close(QIOChannel *ioc,
                                     Error **errp)
{
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);

    return qio_channel_close(wioc->master, errp);
}

typedef struct QIOChannelWebsockSource QIOChannelWebsockSource;
struct QIOChannelWebsockSource {
    GSource parent;
    QIOChannelWebsock *wioc;
    GIOCondition condition;
};

static gboolean
qio_channel_websock_source_prepare(GSource *source,
                                   gint *timeout)
{
    QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
    GIOCondition cond = 0;
    *timeout = -1;

    if (wsource->wioc->rawinput.offset) {
        cond |= G_IO_IN;
    }
    if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
        cond |= G_IO_OUT;
    }

    return cond & wsource->condition;
}

static gboolean
qio_channel_websock_source_check(GSource *source)
{
    QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
    GIOCondition cond = 0;

    if (wsource->wioc->rawinput.offset) {
        cond |= G_IO_IN;
    }
    if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
        cond |= G_IO_OUT;
    }

    return cond & wsource->condition;
}

static gboolean
qio_channel_websock_source_dispatch(GSource *source,
                                    GSourceFunc callback,
                                    gpointer user_data)
{
    QIOChannelFunc func = (QIOChannelFunc)callback;
    QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
    GIOCondition cond = 0;

    if (wsource->wioc->rawinput.offset) {
        cond |= G_IO_IN;
    }
    if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
        cond |= G_IO_OUT;
    }

    return (*func)(QIO_CHANNEL(wsource->wioc),
                   (cond & wsource->condition),
                   user_data);
}

static void
qio_channel_websock_source_finalize(GSource *source)
{
    QIOChannelWebsockSource *ssource = (QIOChannelWebsockSource *)source;

    object_unref(OBJECT(ssource->wioc));
}

GSourceFuncs qio_channel_websock_source_funcs = {
    qio_channel_websock_source_prepare,
    qio_channel_websock_source_check,
    qio_channel_websock_source_dispatch,
    qio_channel_websock_source_finalize
};

static GSource *qio_channel_websock_create_watch(QIOChannel *ioc,
                                                 GIOCondition condition)
{
    QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
    QIOChannelWebsockSource *ssource;
    GSource *source;

    source = g_source_new(&qio_channel_websock_source_funcs,
                          sizeof(QIOChannelWebsockSource));
    ssource = (QIOChannelWebsockSource *)source;

    ssource->wioc = wioc;
    object_ref(OBJECT(wioc));

    ssource->condition = condition;

    qio_channel_websock_set_watch(wioc);
    return source;
}

static void qio_channel_websock_class_init(ObjectClass *klass,
                                           void *class_data G_GNUC_UNUSED)
{
    QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);

    ioc_klass->io_writev = qio_channel_websock_writev;
    ioc_klass->io_readv = qio_channel_websock_readv;
    ioc_klass->io_set_blocking = qio_channel_websock_set_blocking;
    ioc_klass->io_set_cork = qio_channel_websock_set_cork;
    ioc_klass->io_set_delay = qio_channel_websock_set_delay;
    ioc_klass->io_close = qio_channel_websock_close;
    ioc_klass->io_shutdown = qio_channel_websock_shutdown;
    ioc_klass->io_create_watch = qio_channel_websock_create_watch;
}

static const TypeInfo qio_channel_websock_info = {
    .parent = TYPE_QIO_CHANNEL,
    .name = TYPE_QIO_CHANNEL_WEBSOCK,
    .instance_size = sizeof(QIOChannelWebsock),
    .instance_finalize = qio_channel_websock_finalize,
    .class_init = qio_channel_websock_class_init,
};

static void qio_channel_websock_register_types(void)
{
    type_register_static(&qio_channel_websock_info);
}

type_init(qio_channel_websock_register_types);