/*
   Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/


#include <ndb_global.h>

#include <SocketClient.hpp>
#include <SocketAuthenticator.hpp>

SocketClient::SocketClient(const char *server_name, unsigned short port, SocketAuthenticator *sa) :
  m_connect_timeout_millisec(0) // Blocking connect by default
{
  m_auth= sa;
  m_port= port;
  m_server_name= server_name ? strdup(server_name) : 0;
  my_socket_invalidate(&m_sockfd);
}

SocketClient::~SocketClient()
{
  if (m_server_name)
    free(m_server_name);
  if (my_socket_valid(m_sockfd))
    NDB_CLOSE_SOCKET(m_sockfd);
  if (m_auth)
    delete m_auth;
}

bool
SocketClient::init()
{
  if (my_socket_valid(m_sockfd))
    NDB_CLOSE_SOCKET(m_sockfd);

  if (m_server_name)
  {
    memset(&m_servaddr, 0, sizeof(m_servaddr));
    m_servaddr.sin_family = AF_INET;
    m_servaddr.sin_port = htons(m_port);
    // Convert ip address presentation format to numeric format
    if (Ndb_getInAddr(&m_servaddr.sin_addr, m_server_name))
      return false;
  }

  m_sockfd= my_socket_create(AF_INET, SOCK_STREAM, 0);
  if (!my_socket_valid(m_sockfd)) {
    return false;
  }

  DBUG_PRINT("info",("NDB_SOCKET: " MY_SOCKET_FORMAT, MY_SOCKET_FORMAT_VALUE(m_sockfd)));

  return true;
}

int
SocketClient::bind(const char* bindaddress, unsigned short localport)
{
  if (!my_socket_valid(m_sockfd))
    return -1;

  struct sockaddr_in local;
  memset(&local, 0, sizeof(local));
  local.sin_family = AF_INET;
  local.sin_port = htons(localport);
  // Convert ip address presentation format to numeric format
  if (Ndb_getInAddr(&local.sin_addr, bindaddress))
  {
    return errno ? errno : EINVAL;
  }

  if (my_socket_reuseaddr(m_sockfd, true) == -1)
  {
    int ret = my_socket_errno();
    my_socket_close(m_sockfd);
    my_socket_invalidate(&m_sockfd);
    return ret;
  }

  if (my_bind_inet(m_sockfd, &local) == -1)
  {
    int ret = my_socket_errno();
    my_socket_close(m_sockfd);
    my_socket_invalidate(&m_sockfd);
    return ret;
  }

  return 0;
}

#ifdef _WIN32
#define NONBLOCKERR(E) (E!=SOCKET_EAGAIN && E!=SOCKET_EWOULDBLOCK)
#else
#define NONBLOCKERR(E) (E!=EINPROGRESS)
#endif

NDB_SOCKET_TYPE
SocketClient::connect(const char *toaddress, unsigned short toport)
{
  if (!my_socket_valid(m_sockfd))
  {
    if (!init())
    {
      return m_sockfd;
    }
  }

  if (toaddress)
  {
    if (m_server_name)
      free(m_server_name);
    m_server_name = strdup(toaddress);
    m_port = toport;
    memset(&m_servaddr, 0, sizeof(m_servaddr));
    m_servaddr.sin_family = AF_INET;
    m_servaddr.sin_port = htons(toport);
    // Convert ip address presentation format to numeric format
    if (Ndb_getInAddr(&m_servaddr.sin_addr, m_server_name))
    {
      my_socket_close(m_sockfd);
      my_socket_invalidate(&m_sockfd);
      return m_sockfd;
    }
  }

  // Set socket non blocking
  if (my_socket_nonblock(m_sockfd, true) < 0)
  {
    my_socket_close(m_sockfd);
    my_socket_invalidate(&m_sockfd);
    return m_sockfd;
  }

  // Start non blocking connect
  int r = my_connect_inet(m_sockfd, &m_servaddr);
  if (r == 0)
    goto done; // connected immediately.

  if (r < 0 && NONBLOCKERR(my_socket_errno())) {
    // Start of non blocking connect failed
    my_socket_close(m_sockfd);
    my_socket_invalidate(&m_sockfd);
    return m_sockfd;
  }

  if (ndb_poll(m_sockfd, true, true, true,
               m_connect_timeout_millisec > 0 ?
               m_connect_timeout_millisec : -1) <= 0)
  {
    // Nothing has happened on the socket after timeout
    // or an error occured
    my_socket_close(m_sockfd);
    my_socket_invalidate(&m_sockfd);
    return m_sockfd;
  }

  // Activity detected on the socket

  {
    // Check socket level error code
    int so_error = 0;
    SOCKET_SIZE_TYPE len= sizeof(so_error);
    if (my_getsockopt(m_sockfd, SOL_SOCKET, SO_ERROR, &so_error, &len) < 0)
    {
      my_socket_close(m_sockfd);
      my_socket_invalidate(&m_sockfd);
      return m_sockfd;
    }

    if (so_error)
    {
      my_socket_close(m_sockfd);
      my_socket_invalidate(&m_sockfd);
      return m_sockfd;
    }
  }

done:
  if (my_socket_nonblock(m_sockfd, false) < 0)
  {
    my_socket_close(m_sockfd);
    my_socket_invalidate(&m_sockfd);
    return m_sockfd;
  }

  if (m_auth) {
    if (!m_auth->client_authenticate(m_sockfd))
    {
      my_socket_close(m_sockfd);
      my_socket_invalidate(&m_sockfd);
      return m_sockfd;
    }
  }
  NDB_SOCKET_TYPE sockfd = m_sockfd;

  my_socket_invalidate(&m_sockfd);

  return sockfd;
}
