xrdp/rdp/rdp_iso.c

/*
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   xrdp: A Remote Desktop Protocol server.
   Copyright (C) Jay Sorg 2005

   librdp iso layer

*/

#include "rdp.h"

/*****************************************************************************/
struct rdp_iso* APP_CC
rdp_iso_create(struct rdp_mcs* owner)
{
  struct rdp_iso* self;

  self = (struct rdp_iso*)g_malloc(sizeof(struct rdp_iso), 1);
  self->mcs_layer = owner;
  self->tcp_layer = rdp_tcp_create(self);
  return self;
}

/*****************************************************************************/
void APP_CC
rdp_iso_delete(struct rdp_iso* self)
{
  if (self == 0)
  {
    return;
  }
  rdp_tcp_delete(self->tcp_layer);
  g_free(self);
}

/*****************************************************************************/
/* returns error */
static int APP_CC
rdp_iso_recv_msg(struct rdp_iso* self, struct stream* s, int* code)
{
  int ver;
  int len;

  *code = 0;
  if (rdp_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 (rdp_tcp_recv(self->tcp_layer, s, len - 4) != 0)
  {
    return 1;
  }
  in_uint8s(s, 1);
  in_uint8(s, *code);
  if (*code == ISO_PDU_DT)
  {
    in_uint8s(s, 1);
  }
  else
  {
    in_uint8s(s, 5);
  }
  return 0;
}

/*****************************************************************************/
static int APP_CC
rdp_iso_send_msg(struct rdp_iso* self, struct stream* s, int code)
{
  if (rdp_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, 8);
  out_uint8(s, code);
  out_uint16_le(s, 0);
  out_uint16_le(s, 0);
  out_uint8(s, 0);
  s_mark_end(s);
  if (rdp_tcp_send(self->tcp_layer, s) != 0)
  {
    return 1;
  }
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_iso_recv(struct rdp_iso* self, struct stream* s)
{
  int code;

  if (rdp_iso_recv_msg(self, s, &code) != 0)
  {
    return 1;
  }
  if (code != ISO_PDU_DT)
  {
    return 1;
  }
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_iso_init(struct rdp_iso* self, struct stream* s)
{
  rdp_tcp_init(self->tcp_layer, s);
  s_push_layer(s, iso_hdr, 7);
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_iso_send(struct rdp_iso* self, struct stream* s)
{
  int len;

  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 (rdp_tcp_send(self->tcp_layer, s) != 0)
  {
    return 1;
  }
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_iso_connect(struct rdp_iso* self, char* ip, char* port)
{
  int code;
  struct stream* s;

  make_stream(s);
  init_stream(s, 8192);
  if (rdp_tcp_connect(self->tcp_layer, ip, port) != 0)
  {
    free_stream(s);
    return 1;
  }
  if (rdp_iso_send_msg(self, s, ISO_PDU_CR) != 0)
  {
    free_stream(s);
    rdp_tcp_disconnect(self->tcp_layer);
    return 1;
  }
  init_stream(s, 8192);
  if (rdp_iso_recv_msg(self, s, &code) != 0)
  {
    free_stream(s);
    rdp_tcp_disconnect(self->tcp_layer);
    return 1;
  }
  if (code != ISO_PDU_CC)
  {
    free_stream(s);
    rdp_tcp_disconnect(self->tcp_layer);
    return 1;
  }
  free_stream(s);
  return 0;
}