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|
/*
* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS 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 2.1 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
/* This is the only file that uses the berkeley sockets API.
*
* Also holds all the buffering code used in gnutls.
* The buffering code works as:
*
* RECORD LAYER:
* 1. uses a buffer to hold data (application/handshake),
* we got but they were not requested, yet.
* (see gnutls_record_buffer_put(), gnutls_record_buffer_get_size() etc.)
*
* 2. uses a buffer to hold data that were incomplete (ie the read/write
* was interrupted)
* (see _gnutls_io_read_buffered(), _gnutls_io_write_buffered() etc.)
*
* HANDSHAKE LAYER:
* 1. Uses a buffer to hold data that was not sent or received
* complete. (E.g. sent 10 bytes of a handshake packet that is 20 bytes
* long).
* (see _gnutls_handshake_send_int(), _gnutls_handshake_recv_int())
*
* 2. Uses buffer to hold the last received handshake message.
* (see _gnutls_handshake_buffer_put() etc.)
*
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
#include <gnutls_record.h>
#include <gnutls_buffers.h>
#include <errno.h>
/* We need to disable gnulib's replacement wrappers to get native
Windows interfaces. */
#undef recv
#undef send
#ifndef EAGAIN
# define EAGAIN EWOULDBLOCK
#endif
#ifdef IO_DEBUG
# include <io_debug.h>
#endif
/**
* gnutls_transport_set_errno:
* @session: is a #gnutls_session_t structure.
* @err: error value to store in session-specific errno variable.
*
* Store @err in the session-specific errno variable. Useful values
* for @err is EAGAIN and EINTR, other values are treated will be
* treated as real errors in the push/pull function.
*
* This function is useful in replacement push/pull functions set by
* gnutls_transport_set_push_function and
* gnutls_transport_set_pullpush_function under Windows, where the
* replacement push/pull may not have access to the same @errno
* variable that is used by GnuTLS (e.g., the application is linked to
* msvcr71.dll and gnutls is linked to msvcrt.dll).
*
* If you don't have the @session variable easily accessible from the
* push/pull function, and don't worry about thread conflicts, you can
* also use gnutls_transport_set_global_errno().
**/
void
gnutls_transport_set_errno (gnutls_session_t session, int err)
{
session->internals.errnum = err;
}
/**
* gnutls_transport_set_global_errno:
* @err: error value to store in global errno variable.
*
* Store @err in the global errno variable. Useful values for @err is
* EAGAIN and EINTR, other values are treated will be treated as real
* errors in the push/pull function.
*
* This function is useful in replacement push/pull functions set by
* gnutls_transport_set_push_function and
* gnutls_transport_set_pullpush_function under Windows, where the
* replacement push/pull may not have access to the same @errno
* variable that is used by GnuTLS (e.g., the application is linked to
* msvcr71.dll and gnutls is linked to msvcrt.dll).
*
* Whether this function is thread safe or not depends on whether the
* global variable errno is thread safe, some system libraries make it
* a thread-local variable. When feasible, using the guaranteed
* thread-safe gnutls_transport_set_errno() may be better.
**/
void
gnutls_transport_set_global_errno (int err)
{
errno = err;
}
/* Buffers received packets of type APPLICATION DATA and
* HANDSHAKE DATA.
*/
int
_gnutls_record_buffer_put (content_type_t type,
gnutls_session_t session, opaque * data,
size_t length)
{
gnutls_buffer *buf;
if (length == 0)
return 0;
switch (type)
{
case GNUTLS_APPLICATION_DATA:
buf = &session->internals.application_data_buffer;
_gnutls_buffers_log ("BUF[REC]: Inserted %d bytes of Data(%d)\n",
length, type);
break;
case GNUTLS_HANDSHAKE:
buf = &session->internals.handshake_data_buffer;
_gnutls_buffers_log ("BUF[HSK]: Inserted %d bytes of Data(%d)\n",
length, type);
break;
case GNUTLS_INNER_APPLICATION:
buf = &session->internals.ia_data_buffer;
_gnutls_buffers_log ("BUF[IA]: Inserted %d bytes of Data(%d)\n",
length, type);
break;
default:
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
if (_gnutls_buffer_append (buf, data, length) < 0)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
return 0;
}
int
_gnutls_record_buffer_get_size (content_type_t type, gnutls_session_t session)
{
switch (type)
{
case GNUTLS_APPLICATION_DATA:
return session->internals.application_data_buffer.length;
case GNUTLS_HANDSHAKE:
return session->internals.handshake_data_buffer.length;
case GNUTLS_INNER_APPLICATION:
return session->internals.ia_data_buffer.length;
default:
return GNUTLS_E_INVALID_REQUEST;
}
}
/**
* gnutls_record_check_pending - checks if there are any data to receive in gnutls buffers.
* @session: is a #gnutls_session_t structure.
*
* This function checks if there are any data to receive in the gnutls
* buffers.
*
* Notice that you may also use select() to check for data in a TCP
* connection, instead of this function. GnuTLS leaves some data in
* the tcp buffer in order for select to work.
*
* Returns: the size of that data or 0.
**/
size_t
gnutls_record_check_pending (gnutls_session_t session)
{
return _gnutls_record_buffer_get_size (GNUTLS_APPLICATION_DATA, session);
}
int
_gnutls_record_buffer_get (content_type_t type,
gnutls_session_t session, opaque * data,
size_t length)
{
if (length == 0 || data == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
switch (type)
{
case GNUTLS_APPLICATION_DATA:
_gnutls_buffer_get_data( &session->internals.application_data_buffer, data, &length);
_gnutls_buffers_log ("BUFFER[REC][AD]: Read %d bytes of Data(%d)\n",
length, type);
break;
case GNUTLS_HANDSHAKE:
_gnutls_buffer_get_data( &session->internals.handshake_data_buffer, data, &length);
_gnutls_buffers_log ("BUF[REC][HD]: Read %d bytes of Data(%d)\n",
length, type);
break;
case GNUTLS_INNER_APPLICATION:
_gnutls_buffer_get_data( &session->internals.ia_data_buffer, data, &length);
_gnutls_buffers_log ("BUF[REC][IA]: Read %d bytes of Data(%d)\n",
length, type);
break;
default:
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
return length;
}
/* This function is like read. But it does not return -1 on error.
* It does return gnutls_errno instead.
*
* Flags are only used if the default recv() function is being used.
*/
static ssize_t
_gnutls_read (gnutls_session_t session, void *iptr,
size_t sizeOfPtr, int flags)
{
size_t left;
ssize_t i = 0;
char *ptr = iptr;
unsigned j, x, sum = 0;
gnutls_transport_ptr_t fd = session->internals.transport_recv_ptr;
session->internals.direction = 0;
left = sizeOfPtr;
while (left > 0)
{
session->internals.errnum = 0;
if (session->internals._gnutls_pull_func == NULL)
{
i = recv (GNUTLS_POINTER_TO_INT (fd), &ptr[sizeOfPtr - left],
left, flags);
#if HAVE_WINSOCK2_H
if (i < 0)
{
int tmperr = WSAGetLastError ();
switch (tmperr)
{
case WSAEWOULDBLOCK:
session->internals.errnum = EAGAIN;
break;
case WSAEINTR:
session->internals.errnum = EINTR;
break;
default:
session->internals.errnum = EIO;
break;
}
WSASetLastError (tmperr);
}
#endif
}
else
i = session->internals._gnutls_pull_func (fd,
&ptr[sizeOfPtr -
left], left);
if (i < 0)
{
int err = session->internals.errnum ? session->internals.errnum
: errno;
_gnutls_read_log ("READ: %d returned from %p, errno=%d gerrno=%d\n",
i, fd, errno, session->internals.errnum);
if (err == EAGAIN || err == EINTR)
{
if (sizeOfPtr - left > 0)
{
_gnutls_read_log ("READ: returning %d bytes from %p\n",
sizeOfPtr - left, fd);
goto finish;
}
gnutls_assert ();
if (err == EAGAIN)
return GNUTLS_E_AGAIN;
return GNUTLS_E_INTERRUPTED;
}
else
{
gnutls_assert ();
return GNUTLS_E_PULL_ERROR;
}
}
else
{
_gnutls_read_log ("READ: Got %d bytes from %p\n", i, fd);
if (i == 0)
break; /* EOF */
}
left -= i;
}
finish:
if (_gnutls_log_level >= 7)
{
char line[128];
char tmp[16];
_gnutls_read_log ("READ: read %d bytes from %p\n",
(sizeOfPtr - left), fd);
for (x = 0; x < ((sizeOfPtr - left) / 16) + 1; x++)
{
line[0] = 0;
sprintf (tmp, "%.4x - ", x);
_gnutls_str_cat (line, sizeof (line), tmp);
for (j = 0; j < 16; j++)
{
if (sum < (sizeOfPtr - left))
{
sprintf (tmp, "%.2x ", ((unsigned char *) ptr)[sum++]);
_gnutls_str_cat (line, sizeof (line), tmp);
}
}
_gnutls_read_log ("%s\n", line);
}
}
return (sizeOfPtr - left);
}
#define RCVLOWAT session->internals.lowat
/* This function is only used with berkeley style sockets.
* Clears the peeked data (read with MSG_PEEK).
*/
int
_gnutls_io_clear_peeked_data (gnutls_session_t session)
{
char *peekdata;
int ret, sum;
if (session->internals.have_peeked_data == 0 || RCVLOWAT == 0)
return 0;
peekdata = gnutls_malloc (RCVLOWAT);
if (peekdata == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
/* this was already read by using MSG_PEEK - so it shouldn't fail */
sum = 0;
do
{ /* we need this to finish now */
ret = _gnutls_read (session, peekdata, RCVLOWAT - sum, 0);
if (ret > 0)
sum += ret;
}
while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN
|| sum < RCVLOWAT);
gnutls_free (peekdata);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
session->internals.have_peeked_data = 0;
return 0;
}
void
_gnutls_io_clear_read_buffer (gnutls_session_t session)
{
session->internals.record_recv_buffer.length = 0;
}
/* This function is like recv(with MSG_PEEK). But it does not return -1 on error.
* It does return gnutls_errno instead.
* This function reads data from the socket and keeps them in a buffer, of up to
* MAX_RECV_SIZE.
*
* This is not a general purpose function. It returns EXACTLY the data requested,
* which are stored in a local (in the session) buffer. A pointer (iptr) to this buffer is returned.
*
*/
ssize_t
_gnutls_io_read_buffered (gnutls_session_t session, opaque ** iptr,
size_t sizeOfPtr, content_type_t recv_type)
{
ssize_t ret = 0, ret2 = 0;
size_t min;
int buf_pos;
opaque *buf;
int recvlowat;
int recvdata;
*iptr = session->internals.record_recv_buffer.data;
if (sizeOfPtr > MAX_RECV_SIZE || sizeOfPtr == 0)
{
gnutls_assert (); /* internal error */
return GNUTLS_E_INVALID_REQUEST;
}
/* If an external pull function is used, then do not leave
* any data into the kernel buffer.
*/
if (session->internals._gnutls_pull_func != NULL)
{
recvlowat = 0;
}
else
{
/* leave peeked data to the kernel space only if application data
* is received and we don't have any peeked
* data in gnutls session.
*/
if (recv_type != GNUTLS_APPLICATION_DATA
&& session->internals.have_peeked_data == 0)
recvlowat = 0;
else
recvlowat = RCVLOWAT;
}
/* calculate the actual size, ie. get the minimum of the
* buffered data and the requested data.
*/
min = MIN (session->internals.record_recv_buffer.length, sizeOfPtr);
if (min > 0)
{
/* if we have enough buffered data
* then just return them.
*/
if (min == sizeOfPtr)
{
return min;
}
}
/* min is over zero. recvdata is the data we must
* receive in order to return the requested data.
*/
recvdata = sizeOfPtr - min;
/* Check if the previously read data plus the new data to
* receive are longer than the maximum receive buffer size.
*/
if ((session->internals.record_recv_buffer.length + recvdata) >
MAX_RECV_SIZE)
{
gnutls_assert (); /* internal error */
return GNUTLS_E_INVALID_REQUEST;
}
/* Allocate the data required to store the new packet.
*/
ret = _gnutls_buffer_resize( &session->internals.record_recv_buffer,
recvdata + session->internals.record_recv_buffer.length);
if (ret < 0)
{
gnutls_assert();
return ret;
}
buf_pos = session->internals.record_recv_buffer.length;
buf = session->internals.record_recv_buffer.data;
*iptr = buf;
/* READ DATA - but leave RCVLOWAT bytes in the kernel buffer.
*/
if (recvdata - recvlowat > 0)
{
ret = _gnutls_read (session, &buf[buf_pos], recvdata - recvlowat, 0);
/* return immediately if we got an interrupt or eagain
* error.
*/
if (ret < 0 && gnutls_error_is_fatal (ret) == 0)
{
return ret;
}
}
/* copy fresh data to our buffer.
*/
if (ret > 0)
{
_gnutls_read_log
("RB: Have %d bytes into buffer. Adding %d bytes.\n",
session->internals.record_recv_buffer.length, ret);
_gnutls_read_log ("RB: Requested %d bytes\n", sizeOfPtr);
session->internals.record_recv_buffer.length += ret;
}
buf_pos = session->internals.record_recv_buffer.length;
/* This is hack in order for select to work. Just leave recvlowat data,
* into the kernel buffer (using a read with MSG_PEEK), thus making
* select think, that the socket is ready for reading.
* MSG_PEEK is only used with berkeley style sockets.
*/
if (ret == (recvdata - recvlowat) && recvlowat > 0)
{
ret2 = _gnutls_read (session, &buf[buf_pos], recvlowat, MSG_PEEK);
if (ret2 < 0 && gnutls_error_is_fatal (ret2) == 0)
{
return ret2;
}
if (ret2 > 0)
{
_gnutls_read_log ("RB-PEEK: Read %d bytes in PEEK MODE.\n", ret2);
_gnutls_read_log
("RB-PEEK: Have %d bytes into buffer. Adding %d bytes.\nRB: Requested %d bytes\n",
session->internals.record_recv_buffer.length, ret2, sizeOfPtr);
session->internals.have_peeked_data = 1;
session->internals.record_recv_buffer.length += ret2;
}
}
if (ret < 0 || ret2 < 0)
{
gnutls_assert ();
/* that's because they are initialized to 0 */
return MIN (ret, ret2);
}
ret += ret2;
if (ret > 0 && ret < recvlowat)
{
gnutls_assert ();
return GNUTLS_E_AGAIN;
}
if (ret == 0)
{ /* EOF */
gnutls_assert ();
return 0;
}
ret = session->internals.record_recv_buffer.length;
if ((ret > 0) && ((size_t) ret < sizeOfPtr))
{
/* Short Read */
gnutls_assert ();
return GNUTLS_E_AGAIN;
}
else
{
return ret;
}
}
/* This function is like write. But it does not return -1 on error.
* It does return gnutls_errno instead.
*
* In case of E_AGAIN and E_INTERRUPTED errors, you must call gnutls_write_flush(),
* until it returns ok (0).
*
* We need to push exactly the data in n, since we cannot send less
* data. In TLS the peer must receive the whole packet in order
* to decrypt and verify the integrity.
*
*/
ssize_t
_gnutls_io_write_buffered (gnutls_session_t session,
const void *iptr, size_t n)
{
size_t left;
unsigned j, x, sum = 0;
ssize_t retval, i;
const opaque *ptr;
gnutls_transport_ptr_t fd = session->internals.transport_send_ptr;
/* to know where the procedure was interrupted.
*/
session->internals.direction = 1;
ptr = iptr;
/* In case the previous write was interrupted, check if the
* iptr != NULL and we have data in the buffer.
* If this is true then return an error.
*/
if (session->internals.record_send_buffer.length > 0 && iptr != NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
/* If data in the buffer exist
*/
if (iptr == NULL)
{
gnutls_datum bdata;
/* checking is handled above */
_gnutls_buffer_get_datum (&session->internals.record_send_buffer, &bdata, n);
ptr = bdata.data;
n = bdata.size;
_gnutls_write_log
("WRITE: Restoring old write. (%d bytes to send)\n", n);
}
_gnutls_write_log ("WRITE: Will write %d bytes to %p.\n", n, fd);
i = 0;
left = n;
while (left > 0)
{
session->internals.errnum = 0;
if (session->internals._gnutls_push_func == NULL)
{
i = send (GNUTLS_POINTER_TO_INT (fd), &ptr[n - left], left, 0);
#if HAVE_WINSOCK2_H
if (i < 0)
{
int tmperr = WSAGetLastError ();
switch (tmperr)
{
case WSAEWOULDBLOCK:
session->internals.errnum = EAGAIN;
break;
case WSAEINTR:
session->internals.errnum = EINTR;
break;
default:
session->internals.errnum = EIO;
break;
}
WSASetLastError (tmperr);
}
#endif
}
else
i = session->internals._gnutls_push_func (fd, &ptr[n - left], left);
if (i == -1)
{
int err = session->internals.errnum ? session->internals.errnum
: errno;
if (err == EAGAIN || err == EINTR)
{
session->internals.record_send_buffer_prev_size += n - left;
retval =
_gnutls_buffer_append (&session->internals.record_send_buffer,
&ptr[n - left], left);
if (retval < 0)
{
gnutls_assert ();
return retval;
}
_gnutls_write_log
("WRITE: Interrupted. Stored %d bytes to buffer. Already sent %d bytes.\n",
left, n - left);
if (err == EAGAIN)
return GNUTLS_E_AGAIN;
return GNUTLS_E_INTERRUPTED;
}
else
{
gnutls_assert ();
return GNUTLS_E_PUSH_ERROR;
}
}
left -= i;
if (_gnutls_log_level >= 7)
{
char line[128];
char tmp[16];
_gnutls_write_log
("WRITE: wrote %d bytes to %p. Left %d bytes. Total %d bytes.\n",
i, fd, left, n);
for (x = 0; x < (unsigned) ((i) / 16) + 1; x++)
{
line[0] = 0;
if (sum > n - left)
break;
sprintf (tmp, "%.4x - ", x);
_gnutls_str_cat (line, sizeof (line), tmp);
for (j = 0; j < 16; j++)
{
if (sum < n - left)
{
sprintf (tmp, "%.2x ",
((const unsigned char *) ptr)[sum++]);
_gnutls_str_cat (line, sizeof (line), tmp);
}
else
break;
}
_gnutls_write_log ("%s\n", line);
}
}
}
retval = n + session->internals.record_send_buffer_prev_size;
session->internals.record_send_buffer.length = 0;
session->internals.record_send_buffer_prev_size = 0;
return retval;
}
/* This function writes the data that are left in the
* TLS write buffer (ie. because the previous write was
* interrupted.
*/
ssize_t
_gnutls_io_write_flush (gnutls_session_t session)
{
ssize_t ret;
if (session->internals.record_send_buffer.length == 0)
return 0; /* done */
ret = _gnutls_io_write_buffered (session, NULL, 0);
_gnutls_write_log ("WRITE FLUSH: %d [buffer: %d]\n", ret,
session->internals.record_send_buffer.length);
return ret;
}
/* This function writes the data that are left in the
* Handshake write buffer (ie. because the previous write was
* interrupted.
*/
ssize_t
_gnutls_handshake_io_write_flush (gnutls_session_t session)
{
ssize_t ret;
ret = _gnutls_handshake_io_send_int (session, 0, 0, NULL, 0);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
_gnutls_write_log ("HANDSHAKE_FLUSH: written[1] %d bytes\n", ret);
if (session->internals.handshake_send_buffer.length == 0)
{
ret = session->internals.handshake_send_buffer_prev_size; /* done */
session->internals.handshake_send_buffer_prev_size = 0;
}
return ret;
}
/* This is a send function for the gnutls handshake
* protocol. Just makes sure that all data have been sent.
*/
ssize_t
_gnutls_handshake_io_send_int (gnutls_session_t session,
content_type_t type,
gnutls_handshake_description_t htype,
const void *iptr, size_t n)
{
size_t left;
ssize_t ret = 0;
const opaque *ptr;
ssize_t retval = 0;
ptr = iptr;
if (session->internals.handshake_send_buffer.length > 0 && ptr == NULL
&& n == 0)
{
gnutls_datum bdata;
/* resuming previously interrupted write
*/
gnutls_assert ();
/* checking is handled above */
_gnutls_buffer_get_datum (&session->internals.handshake_send_buffer, &bdata, n);
ptr = bdata.data;
n = bdata.size;
type = session->internals.handshake_send_buffer_type;
htype = session->internals.handshake_send_buffer_htype;
}
else if (session->internals.handshake_send_buffer.length > 0)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
#ifdef WRITE_DEBUG
else
{
size_t sum = 0, x, j;
_gnutls_write_log ("HWRITE: will write %d bytes to %d.\n", n,
gnutls_transport_get_ptr (session));
for (x = 0; x < ((n) / 16) + 1; x++)
{
if (sum > n)
break;
_gnutls_write_log ("%.4x - ", x);
for (j = 0; j < 16; j++)
{
if (sum < n)
{
_gnutls_write_log ("%.2x ", ((unsigned char *) ptr)[sum++]);
}
else
break;
}
_gnutls_write_log ("\n");
}
_gnutls_write_log ("\n");
}
#endif
if (n == 0)
{ /* if we have no data to send */
gnutls_assert ();
return 0;
}
else if (ptr == NULL)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
left = n;
while (left > 0)
{
ret = _gnutls_send_int (session, type, htype, &ptr[n - left], left);
if (ret <= 0)
{
if (ret == 0)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
}
if (left > 0
&& (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN))
{
gnutls_assert ();
retval =
_gnutls_buffer_append (&session->internals.
handshake_send_buffer, &ptr[n - left],
left);
if (retval < 0)
{
gnutls_assert ();
return retval;
}
session->internals.handshake_send_buffer_prev_size += n - left;
session->internals.handshake_send_buffer_type = type;
session->internals.handshake_send_buffer_htype = htype;
}
else
{
session->internals.handshake_send_buffer_prev_size = 0;
session->internals.handshake_send_buffer.length = 0;
}
gnutls_assert ();
return ret;
}
left -= ret;
}
retval = n + session->internals.handshake_send_buffer_prev_size;
session->internals.handshake_send_buffer.length = 0;
session->internals.handshake_send_buffer_prev_size = 0;
return retval;
}
/* This is a receive function for the gnutls handshake
* protocol. Makes sure that we have received all data.
*/
ssize_t
_gnutls_handshake_io_recv_int (gnutls_session_t session,
content_type_t type,
gnutls_handshake_description_t htype,
void *iptr, size_t sizeOfPtr)
{
size_t left;
ssize_t i;
opaque *ptr;
size_t dsize;
ptr = iptr;
left = sizeOfPtr;
if (sizeOfPtr == 0 || iptr == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
if (session->internals.handshake_recv_buffer.length > 0)
{
size_t tmp;
/* if we have already received some data */
if (sizeOfPtr <= session->internals.handshake_recv_buffer.length)
{
/* if requested less data then return it.
*/
gnutls_assert ();
tmp = sizeOfPtr;
_gnutls_string_get_data( &session->internals.handshake_recv_buffer, iptr, &tmp);
return tmp;
}
gnutls_assert ();
tmp = sizeOfPtr;
_gnutls_string_get_data( &session->internals.handshake_recv_buffer, iptr, &tmp);
left -= tmp;
htype = session->internals.handshake_recv_buffer_htype;
type = session->internals.handshake_recv_buffer_type;
}
while (left > 0)
{
dsize = sizeOfPtr - left;
i = _gnutls_recv_int (session, type, htype, &ptr[dsize], left);
if (i < 0)
{
if (dsize > 0 && (i == GNUTLS_E_INTERRUPTED || i == GNUTLS_E_AGAIN))
{
gnutls_assert ();
_gnutls_buffer_append (&session->internals.handshake_recv_buffer, iptr,
dsize);
session->internals.handshake_recv_buffer_htype = htype;
session->internals.handshake_recv_buffer_type = type;
}
gnutls_assert ();
return i;
}
else
{
if (i == 0)
break; /* EOF */
}
left -= i;
}
session->internals.handshake_recv_buffer.length = 0;
return sizeOfPtr - left;
}
/* Buffer for handshake packets. Keeps the packets in order
* for finished messages to use them. Used in HMAC calculation
* and finished messages.
*/
int
_gnutls_handshake_buffer_put (gnutls_session_t session, opaque * data,
size_t length)
{
if (length == 0)
return 0;
if ((session->internals.max_handshake_data_buffer_size > 0) &&
((length + session->internals.handshake_hash_buffer.length) >
session->internals.max_handshake_data_buffer_size))
{
gnutls_assert ();
return GNUTLS_E_HANDSHAKE_TOO_LARGE;
}
_gnutls_buffers_log ("BUF[HSK]: Inserted %d bytes of Data\n", length);
if (_gnutls_buffer_append (&session->internals.handshake_hash_buffer,
data, length) < 0)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
return 0;
}
int
_gnutls_handshake_buffer_get_size (gnutls_session_t session)
{
return session->internals.handshake_hash_buffer.length;
}
/* this function does not touch the buffer
* and returns data from it (peek mode!)
*/
int
_gnutls_handshake_buffer_peek (gnutls_session_t session, opaque * data,
size_t length)
{
if (length > session->internals.handshake_hash_buffer.length)
{
length = session->internals.handshake_hash_buffer.length;
}
_gnutls_buffers_log ("BUF[HSK]: Peeked %d bytes of Data\n", length);
memcpy (data, session->internals.handshake_hash_buffer.data, length);
return length;
}
/* this function does not touch the buffer
* and returns data from it (peek mode!)
*/
int
_gnutls_handshake_buffer_get_ptr (gnutls_session_t session,
opaque ** data_ptr, size_t * length)
{
if (length != NULL)
*length = session->internals.handshake_hash_buffer.length;
_gnutls_buffers_log ("BUF[HSK]: Peeked %d bytes of Data\n", *length);
if (data_ptr != NULL)
*data_ptr = session->internals.handshake_hash_buffer.data;
return 0;
}
/* Does not free the buffer
*/
int
_gnutls_handshake_buffer_empty (gnutls_session_t session)
{
_gnutls_buffers_log ("BUF[HSK]: Emptied buffer\n");
session->internals.handshake_hash_buffer.length = 0;
return 0;
}
int
_gnutls_handshake_buffer_clear (gnutls_session_t session)
{
_gnutls_buffers_log ("BUF[HSK]: Cleared Data from buffer\n");
_gnutls_buffer_clear (&session->internals.handshake_hash_buffer);
return 0;
}
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