xrdp/rdp/rdp_tcp.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 2005-2010

   librdp tcp layer

*/

#include "rdp.h"

/*****************************************************************************/
struct rdp_tcp* APP_CC
rdp_tcp_create(struct rdp_iso* owner)
{
  struct rdp_tcp* self;

  self = (struct rdp_tcp*)g_malloc(sizeof(struct rdp_tcp), 1);
  self->iso_layer = owner;
  return self;
}

/*****************************************************************************/
void APP_CC
rdp_tcp_delete(struct rdp_tcp* self)
{
  g_free(self);
}

/*****************************************************************************/
/* get out stream ready for data */
/* returns error */
int APP_CC
rdp_tcp_init(struct rdp_tcp* self, struct stream* s)
{
  init_stream(s, 8192);
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_tcp_recv(struct rdp_tcp* self, struct stream* s, int len)
{
  int rcvd;

  DEBUG(("    in rdp_tcp_recv gota get %d bytes on sck %d",
         len, self->sck));
  if (self->sck_closed)
  {
    DEBUG(("    out rdp_tcp_recv error sck closed"));
    return 1;
  }
  init_stream(s, len);
  while (len > 0)
  {
    rcvd = g_tcp_recv(self->sck, s->end, len, 0);
    if (rcvd == -1)
    {
      if (g_tcp_last_error_would_block(self->sck))
      {
        g_tcp_can_recv(self->sck, 10);
      }
      else
      {
        self->sck_closed = 1;
        DEBUG(("    out rdp_tcp_recv error unknown"));
        return 1;
      }
    }
    else if (rcvd == 0)
    {
      self->sck_closed = 1;
      DEBUG(("    out rdp_tcp_recv error connection dropped"));
      return 1;
    }
    else
    {
      s->end += rcvd;
      len -= rcvd;
    }
  }
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_tcp_send(struct rdp_tcp* self, struct stream* s)
{
  int len;
  int total;
  int sent;

  if (self->sck_closed)
  {
    DEBUG(("    out rdp_tcp_send error sck closed"));
    return 1;
  }
  len = s->end - s->data;
  DEBUG(("    in rdp_tcp_send gota send %d bytes on sck %d", len,
         self->sck));
  total = 0;
  while (total < len)
  {
    sent = g_tcp_send(self->sck, s->data + total, len - total, 0);
    if (sent == -1)
    {
      if (g_tcp_last_error_would_block(self->sck))
      {
        g_tcp_can_send(self->sck, 10);
      }
      else
      {
        self->sck_closed = 1;
        DEBUG(("    out rdp_tcp_send error unknown"));
        return 1;
      }
    }
    else if (sent == 0)
    {
      self->sck_closed = 1;
      DEBUG(("    out rdp_tcp_send error connection dropped"));
      return 1;
    }
    else
    {
      total = total + sent;
    }
  }
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_tcp_connect(struct rdp_tcp* self, char* ip, char* port)
{
  DEBUG(("    in rdp_tcp_connect ip %s port %s", ip, port));
  self->sck = g_tcp_socket();
  if (g_tcp_connect(self->sck, ip, port) == 0)
  {
    g_tcp_set_non_blocking(self->sck);
  }
  else
  {
    DEBUG(("    out rdp_tcp_connect error g_tcp_connect failed"));
    return 1;
  }
  DEBUG(("    out rdp_tcp_connect"));
  return 0;
}

/*****************************************************************************/
/* returns error */
int APP_CC
rdp_tcp_disconnect(struct rdp_tcp* self)
{
  if (self->sck != 0)
  {
    g_tcp_close(self->sck);
  }
  self->sck = 0;
  return 0;
}