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xrdp-proprietary/libxrdp/xrdp_iso.c

235 lines
4.8 KiB

/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* iso layer
*/
#include "libxrdp.h"
/*****************************************************************************/
struct xrdp_iso *APP_CC
xrdp_iso_create(struct xrdp_mcs *owner, struct trans *trans)
{
struct xrdp_iso *self;
DEBUG((" in xrdp_iso_create"));
self = (struct xrdp_iso *)g_malloc(sizeof(struct xrdp_iso), 1);
self->mcs_layer = owner;
self->tcp_layer = xrdp_tcp_create(self, trans);
DEBUG((" out xrdp_iso_create"));
return self;
}
/*****************************************************************************/
void APP_CC
xrdp_iso_delete(struct xrdp_iso *self)
{
if (self == 0)
{
return;
}
xrdp_tcp_delete(self->tcp_layer);
g_free(self);
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_iso_recv_msg(struct xrdp_iso *self, struct stream *s, int *code)
{
int ver;
int len;
*code = 0;
if (xrdp_tcp_recv(self->tcp_layer, s, 4) != 0)
{
return 1;
}
in_uint8(s, ver);
if (ver != 3)
{
return 1;
}
in_uint8s(s, 1);
in_uint16_be(s, len);
if (len < 4)
{
return 1;
}
if (xrdp_tcp_recv(self->tcp_layer, s, len - 4) != 0)
{
return 1;
}
if (!s_check_rem(s, 2))
{
return 1;
}
in_uint8s(s, 1);
in_uint8(s, *code);
if (*code == ISO_PDU_DT)
{
if (!s_check_rem(s, 1))
{
return 1;
}
in_uint8s(s, 1);
}
else
{
if (!s_check_rem(s, 5))
{
return 1;
}
in_uint8s(s, 5);
}
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_recv(struct xrdp_iso *self, struct stream *s)
{
int code;
DEBUG((" in xrdp_iso_recv"));
if (xrdp_iso_recv_msg(self, s, &code) != 0)
{
DEBUG((" out xrdp_iso_recv xrdp_iso_recv_msg return non zero"));
return 1;
}
if (code != ISO_PDU_DT)
{
DEBUG((" out xrdp_iso_recv code != ISO_PDU_DT"));
return 1;
}
DEBUG((" out xrdp_iso_recv"));
return 0;
}
/*****************************************************************************/
static int APP_CC
xrdp_iso_send_msg(struct xrdp_iso *self, struct stream *s, int code)
{
if (xrdp_tcp_init(self->tcp_layer, s) != 0)
{
return 1;
}
out_uint8(s, 3);
out_uint8(s, 0);
out_uint16_be(s, 11); /* length */
out_uint8(s, 6);
out_uint8(s, code);
out_uint16_le(s, 0);
out_uint16_le(s, 0);
out_uint8(s, 0);
s_mark_end(s);
if (xrdp_tcp_send(self->tcp_layer, s) != 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_incoming(struct xrdp_iso *self)
{
int code;
struct stream *s;
make_stream(s);
init_stream(s, 8192);
DEBUG((" in xrdp_iso_incoming"));
if (xrdp_iso_recv_msg(self, s, &code) != 0)
{
free_stream(s);
return 1;
}
if (code != ISO_PDU_CR)
{
free_stream(s);
return 1;
}
if (xrdp_iso_send_msg(self, s, ISO_PDU_CC) != 0)
{
free_stream(s);
return 1;
}
DEBUG((" out xrdp_iso_incoming"));
free_stream(s);
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_init(struct xrdp_iso *self, struct stream *s)
{
xrdp_tcp_init(self->tcp_layer, s);
s_push_layer(s, iso_hdr, 7);
return 0;
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_iso_send(struct xrdp_iso *self, struct stream *s)
{
int len;
DEBUG((" in xrdp_iso_send"));
s_pop_layer(s, iso_hdr);
len = s->end - s->p;
out_uint8(s, 3);
out_uint8(s, 0);
out_uint16_be(s, len);
out_uint8(s, 2);
out_uint8(s, ISO_PDU_DT);
out_uint8(s, 0x80);
if (xrdp_tcp_send(self->tcp_layer, s) != 0)
{
return 1;
}
DEBUG((" out xrdp_iso_send"));
return 0;
}