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qemu-e2k/io/channel-websock.c
Daniel P. Berrange 2d1d0e70cf io: add QIOChannelWebsock class 
Add a QIOChannel subclass that can run the websocket protocol over
the top of another QIOChannel instance. This initial implementation
is only capable of acting as a websockets server. There is no support
for acting as a websockets client yet.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2015-12-18 12:18:31 +00:00

963 lines
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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/>.
*
*/
#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)
#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_PROTOCOL_BINARY "binary"
#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"
/* 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;
};
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
};
static char *qio_channel_websock_handshake_entry(const char *handshake,
size_t handshake_len,
const char *name)
{
char *begin, *end, *ret = NULL;
char *line = g_strdup_printf("%s%s: ",
QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM,
name);
begin = g_strstr_len(handshake, handshake_len, line);
if (begin != NULL) {
begin += strlen(line);
end = g_strstr_len(begin, handshake_len - (begin - handshake),
QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
if (end != NULL) {
ret = g_strndup(begin, end - begin);
}
}
g_free(line);
return ret;
}
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,
const char *line,
size_t size,
Error **errp)
{
int ret = -1;
char *protocols = qio_channel_websock_handshake_entry(
line, size, QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL);
char *version = qio_channel_websock_handshake_entry(
line, size, QIO_CHANNEL_WEBSOCK_HEADER_VERSION);
char *key = qio_channel_websock_handshake_entry(
line, size, QIO_CHANNEL_WEBSOCK_HEADER_KEY);
if (!protocols) {
error_setg(errp, "Missing websocket protocol header data");
goto cleanup;
}
if (!version) {
error_setg(errp, "Missing websocket version header data");
goto cleanup;
}
if (!key) {
error_setg(errp, "Missing websocket key header data");
goto cleanup;
}
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);
goto cleanup;
}
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);
goto cleanup;
}
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);
goto cleanup;
}
ret = qio_channel_websock_handshake_send_response(ioc, key, errp);
cleanup:
g_free(protocols);
g_free(version);
g_free(key);
return ret;
}
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;
}
}
if (qio_channel_websock_handshake_process(ioc,
(char *)ioc->encinput.buffer,
ioc->encinput.offset,
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);
qio_task_abort(task, err);
error_free(err);
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);
qio_task_abort(task, err);
error_free(err);
return FALSE;
}
if (ret == 0) {
trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
/* need more data still */
return TRUE;
}
object_ref(OBJECT(task));
trace_qio_channel_websock_handshake_reply(ioc);
qio_channel_add_watch(
wioc->master,
G_IO_OUT,
qio_channel_websock_handshake_send,
task,
(GDestroyNotify)object_unref);
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;
if (master->features & (1 << QIO_CHANNEL_FEATURE_SHUTDOWN)) {
ioc->features |= (1 << QIO_CHANNEL_FEATURE_SHUTDOWN);
}
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;
}
if (ioc->payload_remain == 0) {
ret = qio_channel_websock_decode_header(ioc, errp);
if (ret < 0) {
return ret;
}
if (ret == 0) {
return 0;
}
}
ret = qio_channel_websock_decode_payload(ioc, errp);
if (ret < 0) {
return ret;
}
return ret;
}
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;
}
if (ret == 0) {
wioc->io_eof = TRUE;
}
}
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);
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