static gint
socket_recv_messages (NiceSocket *sock,
NiceInputMessage *recv_messages, guint n_recv_messages)
{
PseudoSSLPriv *priv = sock->priv;
/* Socket has been closed: */
if (sock->priv == NULL)
return 0;
if (priv->handshaken) {
if (priv->base_socket) {
/* Fast path: once we’ve done the handshake, pass straight through to the
* base socket. */
return nice_socket_recv_messages (priv->base_socket,
recv_messages, n_recv_messages);
}
} else {
guint8 data[MAX(sizeof(SSL_SERVER_GOOGLE_HANDSHAKE),
sizeof(SSL_SERVER_MSOC_HANDSHAKE))];
gint ret = -1;
GInputVector local_recv_buf = { data, sizeof(data) };
NiceInputMessage local_recv_message = { &local_recv_buf, 1, NULL, 0 };
if (priv->compatibility == NICE_PSEUDOSSL_SOCKET_COMPATIBILITY_MSOC) {
local_recv_buf.size = sizeof(SSL_SERVER_MSOC_HANDSHAKE);
} else {
local_recv_buf.size = sizeof(SSL_SERVER_GOOGLE_HANDSHAKE);
}
if (priv->base_socket) {
ret = nice_socket_recv_messages (priv->base_socket,
&local_recv_message, 1);
}
if (ret <= 0) {
return ret;
} else if (ret == 1 && server_handshake_valid(sock, &local_recv_buf,
local_recv_message.length)) {
priv->handshaken = TRUE;
nice_socket_flush_send_queue (priv->base_socket, &priv->send_queue);
} else {
if (priv->base_socket)
nice_socket_free (priv->base_socket);
priv->base_socket = NULL;
return -1;
}
}
return 0;
}
static gssize
socket_recv_message (NiceSocket *sock, NiceInputMessage *recv_message)
{
TurnTcpPriv *priv = sock->priv;
gssize ret;
guint padlen;
GInputVector local_recv_buf;
NiceInputMessage local_recv_message;
if (priv->expecting_len == 0) {
guint headerlen = 0;
if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_DRAFT9 ||
priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_RFC5766)
headerlen = 4;
else if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_GOOGLE)
headerlen = 2;
else
return -1;
local_recv_buf.buffer = priv->recv_buf.u8 + priv->recv_buf_len;
local_recv_buf.size = headerlen - priv->recv_buf_len;
local_recv_message.buffers = &local_recv_buf;
local_recv_message.n_buffers = 1;
local_recv_message.from = recv_message->from;
local_recv_message.length = 0;
ret = nice_socket_recv_messages (priv->base_socket, &local_recv_message, 1);
if (ret < 0)
return ret;
priv->recv_buf_len += local_recv_message.length;
if (priv->recv_buf_len < headerlen)
return 0;
if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_DRAFT9 ||
priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_RFC5766) {
guint16 magic = ntohs (*priv->recv_buf.u16);
guint16 packetlen = ntohs (*(priv->recv_buf.u16 + 1));
if (magic < 0x4000) {
/* Its STUN */
priv->expecting_len = 20 + packetlen;
} else {
/* Channel data */
priv->expecting_len = 4 + packetlen;
}
}
else if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_GOOGLE) {
guint compat_len = ntohs (*priv->recv_buf.u16);
priv->expecting_len = compat_len;
priv->recv_buf_len = 0;
}
}
if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_DRAFT9 ||
priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_RFC5766)
padlen = (priv->expecting_len % 4) ? 4 - (priv->expecting_len % 4) : 0;
else
padlen = 0;
local_recv_buf.buffer = priv->recv_buf.u8 + priv->recv_buf_len;
local_recv_buf.size = priv->expecting_len + padlen - priv->recv_buf_len;
local_recv_message.buffers = &local_recv_buf;
local_recv_message.n_buffers = 1;
local_recv_message.from = recv_message->from;
local_recv_message.length = 0;
ret = nice_socket_recv_messages (priv->base_socket, &local_recv_message, 1);
if (ret < 0)
return ret;
priv->recv_buf_len += local_recv_message.length;
if (priv->recv_buf_len == priv->expecting_len + padlen) {
/* FIXME: Eliminate this memcpy(). */
ret = memcpy_buffer_to_input_message (recv_message,
priv->recv_buf.u8, priv->recv_buf_len);
priv->expecting_len = 0;
priv->recv_buf_len = 0;
return ret;
}
return 0;
}
/* FIXME: The current implementation of socket_recv_message() is a fast
* pass-through to nice_socket_recv_message() if the HTTP socket is connected,
* but is a slow state machine otherwise, using multiple memcpy()s. Spruce it up
* to better to use the recv_messages to avoid the memcpy()s. */
static gint
socket_recv_messages (NiceSocket *sock,
NiceInputMessage *recv_messages, guint n_recv_messages)
{
HttpPriv *priv = sock->priv;
gint ret = -1;
/* Socket has been closed: */
if (sock->priv == NULL)
return 0;
if (priv->state == HTTP_STATE_CONNECTED) {
guint i;
/* Fast path: pass through to the base socket once we’re connected. */
if (priv->base_socket) {
ret = nice_socket_recv_messages (priv->base_socket,
recv_messages, n_recv_messages);
}
if (ret <= 0)
return ret;
/* After successfully receiving into at least one NiceInputMessage,
* update the from address in each valid NiceInputMessage. */
for (i = 0; i < (guint) ret; i++) {
if (recv_messages[i].from != NULL)
*recv_messages[i].from = priv->addr;
}
return ret;
} else {
/* Slow path: read into a local ring buffer until we’re parsed enough of the
* headers. Double the buffer in size every time it fills up. */
gboolean has_wrapped;
GInputVector local_recv_bufs[2];
NiceInputMessage local_recv_message = { local_recv_bufs, 2, NULL, 0 };
/* Has the buffer filled up? Start with an initial buffer of 1KB, which
* should cover the average size of HTTP response headers. Source:
* http://dev.chromium.org/spdy/spdy-whitepaper */
if (priv->recv_buf_fill == priv->recv_buf_length) {
priv->recv_buf_length = MAX (priv->recv_buf_length * 2, 1024);
priv->recv_buf = g_realloc (priv->recv_buf, priv->recv_buf_length);
}
assert_ring_buffer_valid (priv);
/* Read some data into the buffer. Use two GInputVectors: one for the tail
* of the buffer and one for the head. */
has_wrapped =
(priv->recv_buf_pos + priv->recv_buf_fill) > priv->recv_buf_length;
if (has_wrapped) {
local_recv_bufs[0].buffer =
priv->recv_buf + (priv->recv_buf_pos + priv->recv_buf_fill) %
priv->recv_buf_length;
local_recv_bufs[0].size = priv->recv_buf_length - priv->recv_buf_fill;
local_recv_bufs[1].buffer = NULL;
local_recv_bufs[1].size = 0;
} else {
local_recv_bufs[0].buffer =
priv->recv_buf + priv->recv_buf_pos + priv->recv_buf_fill;
local_recv_bufs[0].size =
priv->recv_buf_length - (priv->recv_buf_pos + priv->recv_buf_fill);
local_recv_bufs[1].buffer = priv->recv_buf;
local_recv_bufs[1].size = priv->recv_buf_pos;
}
if (priv->base_socket) {
ret = nice_socket_recv_messages (priv->base_socket,
&local_recv_message, 1);
}
if (ret <= 0)
return ret;
/* Update the buffer’s metadata. */
priv->recv_buf_fill += local_recv_message.length;
assert_ring_buffer_valid (priv);
/* Fall through and try parsing the newly received data. */
}
#define GET_BYTE(pos) \
priv->recv_buf[(pos + priv->recv_buf_pos) % priv->recv_buf_length]
#define EAT_WHITESPACE(pos) \
while (pos < priv->recv_buf_fill && GET_BYTE(pos) == ' ') \
pos++; \
if (pos >= priv->recv_buf_fill) \
goto not_enough_data;
retry:
nice_debug ("Receiving from HTTP proxy (state %d) : %" G_GSSIZE_FORMAT " \n"
"'%s'", priv->state, priv->recv_buf_fill,
priv->recv_buf + priv->recv_buf_pos);
switch (priv->state) {
case HTTP_STATE_INIT:
{
/* This is a logical position in the recv_buf; add
* (priv->recv_buf + priv->recv_buf_pos) to get the actual byte in
* memory. */
guint pos = 0;
/* Eat leading whitespace and check we have enough data. */
EAT_WHITESPACE (pos);
if (pos + 7 > priv->recv_buf_fill)
goto not_enough_data;
if (GET_BYTE (pos + 0) != 'H' ||
GET_BYTE (pos + 1) != 'T' ||
GET_BYTE (pos + 2) != 'T' ||
GET_BYTE (pos + 3) != 'P' ||
GET_BYTE (pos + 4) != '/' ||
GET_BYTE (pos + 5) != '1' ||
GET_BYTE (pos + 6) != '.')
goto error;
pos += 7;
if (pos >= priv->recv_buf_fill)
goto not_enough_data;
if (GET_BYTE (pos) != '0' && GET_BYTE (pos) != '1')
goto error;
pos++;
/* Make sure we have a space after the HTTP version */
if (pos >= priv->recv_buf_fill)
goto not_enough_data;
if (GET_BYTE (pos) != ' ')
goto error;
EAT_WHITESPACE (pos);
/* Check for a successful 2xx code */
if (pos + 3 > priv->recv_buf_fill)
goto not_enough_data;
if (GET_BYTE (pos) != '2' ||
GET_BYTE (pos + 1) < '0' || GET_BYTE (pos + 1) > '9' ||
GET_BYTE (pos + 2) < '0' || GET_BYTE (pos + 2) > '9')
goto error;
/* Clear any trailing chars */
while (pos + 1 < priv->recv_buf_fill &&
GET_BYTE (pos) != '\r' && GET_BYTE (pos + 1) != '\n')
pos++;
if (pos + 1 >= priv->recv_buf_fill)
goto not_enough_data;
pos += 2;
/* Consume the data we just parsed. */
priv->recv_buf_pos = (priv->recv_buf_pos + pos) % priv->recv_buf_length;
priv->recv_buf_fill -= pos;
priv->content_length = 0;
priv->state = HTTP_STATE_HEADERS;
goto retry;
}
break;
case HTTP_STATE_HEADERS:
{
guint pos = 0;
if (pos + 15 < priv->recv_buf_fill &&
(GET_BYTE (pos + 0) == 'C' || GET_BYTE (pos + 0) == 'c') &&
(GET_BYTE (pos + 1) == 'o' || GET_BYTE (pos + 1) == 'O') &&
(GET_BYTE (pos + 2) == 'n' || GET_BYTE (pos + 2) == 'N') &&
(GET_BYTE (pos + 3) == 't' || GET_BYTE (pos + 3) == 'T') &&
(GET_BYTE (pos + 4) == 'e' || GET_BYTE (pos + 4) == 'E') &&
(GET_BYTE (pos + 5) == 'n' || GET_BYTE (pos + 5) == 'N') &&
(GET_BYTE (pos + 6) == 't' || GET_BYTE (pos + 6) == 'T') &&
GET_BYTE (pos + 7) == '-' &&
(GET_BYTE (pos + 8) == 'L' || GET_BYTE (pos + 8) == 'l') &&
(GET_BYTE (pos + 9) == 'e' || GET_BYTE (pos + 9) == 'E') &&
(GET_BYTE (pos + 10) == 'n' || GET_BYTE (pos + 10) == 'N') &&
(GET_BYTE (pos + 11) == 'g' || GET_BYTE (pos + 11) == 'G') &&
(GET_BYTE (pos + 12) == 't' || GET_BYTE (pos + 12) == 'T') &&
(GET_BYTE (pos + 13) == 'h' || GET_BYTE (pos + 13) == 'H') &&
GET_BYTE (pos + 14) == ':') {
/* Found a Content-Length header. Parse and store the value. Note that
* the HTTP standard allows for arbitrarily-big content lengths. We
* limit it to G_MAXSIZE for sanity’s sake.
*
* The code below is equivalent to strtoul(input, NULL, 10), but
* operates on a ring buffer. */
pos += 15;
EAT_WHITESPACE (pos);
priv->content_length = 0;
while (TRUE) {
guint8 byte = GET_BYTE (pos);
gint val = g_ascii_digit_value (byte);
if (byte == '\r') {
/* Reached the end of the value; fall out to the code below which
* will grab the \n. */
break;
} else if (val == -1) {
priv->content_length = 0;
goto error;
}
/* Check for overflow. Don’t flag it as an error; just fall through
* to the code below which will skip to the \r\n. */
if (priv->content_length > G_MAXSIZE / 10 ||
priv->content_length * 10 > G_MAXSIZE - val) {
priv->content_length = 0;
break;
}
priv->content_length = (priv->content_length * 10) + val;
if (pos + 1 > priv->recv_buf_fill)
goto not_enough_data;
pos++;
}
}
/* Skip over the header. */
while (pos + 1 < priv->recv_buf_fill &&
GET_BYTE (pos) != '\r' && GET_BYTE (pos + 1) != '\n')
pos++;
nice_debug ("pos = %u, fill = %" G_GSSIZE_FORMAT,
pos, priv->recv_buf_fill);
if (pos + 1 >= priv->recv_buf_fill)
goto not_enough_data;
pos += 2;
/* Consume the data we just parsed. */
priv->recv_buf_pos = (priv->recv_buf_pos + pos) % priv->recv_buf_length;
priv->recv_buf_fill -= pos;
if (pos == 2)
priv->state = HTTP_STATE_BODY;
goto retry;
}
break;
case HTTP_STATE_BODY:
{
gsize consumed;
if (priv->content_length == 0) {
priv->state = HTTP_STATE_CONNECTED;
goto retry;
}
if (priv->recv_buf_fill == 0)
goto not_enough_data;
consumed = MIN (priv->content_length, priv->recv_buf_fill);
priv->recv_buf_pos =
(priv->recv_buf_pos + consumed) % priv->recv_buf_length;
priv->recv_buf_fill -= consumed;
priv->content_length -= consumed;
goto retry;
}
break;
case HTTP_STATE_CONNECTED:
{
gsize len;
len = memcpy_ring_buffer_to_input_messages (priv,
recv_messages, n_recv_messages);
/* Send the pending data */
nice_socket_flush_send_queue (priv->base_socket,
&priv->send_queue);
return len;
}
break;
case HTTP_STATE_ERROR:
default:
/* Unknown status */
goto error;
}
not_enough_data:
return 0;
error:
nice_debug ("http error");
if (priv->base_socket)
nice_socket_free (priv->base_socket);
priv->base_socket = NULL;
priv->state = HTTP_STATE_ERROR;
return -1;
}
static gssize
socket_recv_message (NiceSocket *sock, NiceInputMessage *recv_message)
{
TurnTcpPriv *priv = sock->priv;
gssize ret;
guint padlen;
GInputVector local_recv_buf;
NiceInputMessage local_recv_message;
/* Socket has been closed: */
if (sock->priv == NULL)
return 0;
if (priv->expecting_len == 0) {
guint headerlen = 0;
if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_DRAFT9 ||
priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_RFC5766 ||
priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_OC2007)
headerlen = 4;
else if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_GOOGLE)
headerlen = 2;
else
return -1;
local_recv_buf.buffer = priv->recv_buf.u8 + priv->recv_buf_len;
local_recv_buf.size = headerlen - priv->recv_buf_len;
local_recv_message.buffers = &local_recv_buf;
local_recv_message.n_buffers = 1;
local_recv_message.from = recv_message->from;
local_recv_message.length = 0;
ret = nice_socket_recv_messages (priv->base_socket, &local_recv_message, 1);
if (ret < 0)
return ret;
priv->recv_buf_len += local_recv_message.length;
if (priv->recv_buf_len < headerlen)
return 0;
if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_DRAFT9 ||
priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_RFC5766) {
guint16 magic = ntohs (*priv->recv_buf.u16);
guint16 packetlen = ntohs (*(priv->recv_buf.u16 + 1));
if (magic < 0x4000) {
/* Its STUN */
priv->expecting_len = 20 + packetlen;
} else {
/* Channel data */
priv->expecting_len = 4 + packetlen;
}
}
else if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_GOOGLE) {
guint compat_len = ntohs (*priv->recv_buf.u16);
priv->expecting_len = compat_len;
priv->recv_buf_len = 0;
}
else if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_OC2007) {
guint8 pt = *priv->recv_buf.u8;
guint16 packetlen = ntohs (priv->recv_buf.u16[1]);
if (pt != MS_TURN_CONTROL_MESSAGE &&
pt != MS_TURN_END_TO_END_DATA) {
/* Unexpected data, error in stream */
return -1;
}
/* Keep the RFC4571 framing for the NiceAgent to unframe */
priv->expecting_len = packetlen + sizeof(guint16);
priv->recv_buf_len = sizeof(guint16);
priv->recv_buf.u16[0] = priv->recv_buf.u16[1];
}
}
if (priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_DRAFT9 ||
priv->compatibility == NICE_TURN_SOCKET_COMPATIBILITY_RFC5766)
padlen = (priv->expecting_len % 4) ? 4 - (priv->expecting_len % 4) : 0;
else
padlen = 0;
local_recv_buf.buffer = priv->recv_buf.u8 + priv->recv_buf_len;
local_recv_buf.size = priv->expecting_len + padlen - priv->recv_buf_len;
local_recv_message.buffers = &local_recv_buf;
local_recv_message.n_buffers = 1;
local_recv_message.from = recv_message->from;
local_recv_message.length = 0;
ret = nice_socket_recv_messages (priv->base_socket, &local_recv_message, 1);
if (ret < 0)
return ret;
priv->recv_buf_len += local_recv_message.length;
if (priv->recv_buf_len == priv->expecting_len + padlen) {
/* FIXME: Eliminate this memcpy(). */
ret = memcpy_buffer_to_input_message (recv_message,
priv->recv_buf.u8, priv->recv_buf_len);
priv->expecting_len = 0;
priv->recv_buf_len = 0;
return ret;
}
return 0;
}
