/* -*- mode: C; c-file-style: "gnu" -*- */

/* dbus-server-unix.c Server implementation for Unix network protocols.

 *

 * Copyright (C) 2002, 2003, 2004  Red Hat Inc.

 *

 * Licensed under the Academic Free License version 2.1

 * 

 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#include "dbus-internals.h"

#include "dbus-server-unix.h"

#include "dbus-server-socket.h"

#include "dbus-transport-unix.h"

#include "dbus-connection-internal.h"

#include "dbus-sysdeps-unix.h"

#include "dbus-string.h"

/**

 * @defgroup DBusServerUnix DBusServer implementations for UNIX

 * @ingroup  DBusInternals

 * @brief Implementation details of DBusServer on UNIX

 *

 * @{

 */

/**

 * Tries to interpret the address entry in a platform-specific

 * way, creating a platform-specific server type if appropriate.

 * Sets error if the result is not OK.

 * 

 * @param entry an address entry

 * @param server_p location to store a new DBusServer, or #NULL on failure.

 * @param error location to store rationale for failure on bad address

 * @returns the outcome

 * 

 */

DBusServerListenResult

_dbus_server_listen_platform_specific (DBusAddressEntry *entry,

                                       DBusServer      **server_p,

                                       DBusError        *error)

{

  const char *method;

  *server_p = NULL;

  method = dbus_address_entry_get_method (entry);

  if (strcmp (method, "unix") == 0)

    {

      const char *path = dbus_address_entry_get_value (entry, "path");

      const char *tmpdir = dbus_address_entry_get_value (entry, "tmpdir");

      const char *abstract = dbus_address_entry_get_value (entry, "abstract");

      if (path == NULL && tmpdir == NULL && abstract == NULL)

        {

          _dbus_set_bad_address(error, "unix",

                                "path or tmpdir or abstract",

                                NULL);

          return DBUS_SERVER_LISTEN_BAD_ADDRESS;

        }

      if ((path && tmpdir) ||

          (path && abstract) ||

          (tmpdir && abstract))

        {

          _dbus_set_bad_address(error, NULL, NULL,

                                "cannot specify two of \"path\" and \"tmpdir\" and \"abstract\" at the same time");

          return DBUS_SERVER_LISTEN_BAD_ADDRESS;

        }

      if (tmpdir != NULL)

        {

          DBusString full_path;

          DBusString filename;

          if (!_dbus_string_init (&full_path))

            {

              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);

              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;

            }

          if (!_dbus_string_init (&filename))

            {

              _dbus_string_free (&full_path);

              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);

              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;

            }

          if (!_dbus_string_append (&filename,

                                    "dbus-") ||

              !_dbus_generate_random_ascii (&filename, 10) ||

              !_dbus_string_append (&full_path, tmpdir) ||

              !_dbus_concat_dir_and_file (&full_path, &filename))

            {

              _dbus_string_free (&full_path);

              _dbus_string_free (&filename);

              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);

              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;

            }

          /* Always use abstract namespace if possible with tmpdir */

          *server_p =

            _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),

#ifdef HAVE_ABSTRACT_SOCKETS

                                                TRUE,

#else

                                                FALSE,

#endif

                                                error);

          _dbus_string_free (&full_path);

          _dbus_string_free (&filename);

        }

      else

        {

          if (path)

            *server_p = _dbus_server_new_for_domain_socket (path, FALSE, error);

          else

            *server_p = _dbus_server_new_for_domain_socket (abstract, TRUE, error);

        }

      if (*server_p != NULL)

        {

          _DBUS_ASSERT_ERROR_IS_CLEAR(error);

          return DBUS_SERVER_LISTEN_OK;

        }

      else

        {

          _DBUS_ASSERT_ERROR_IS_SET(error);

          return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;

        }

    }

  else

    {

      /* If we don't handle the method, we return NULL with the

       * error unset

       */

      _DBUS_ASSERT_ERROR_IS_CLEAR(error);

      return DBUS_SERVER_LISTEN_NOT_HANDLED;

    }

}

/**

 * Creates a new server listening on the given Unix domain socket.

 *

 * @param path the path for the domain socket.

 * @param abstract #TRUE to use abstract socket namespace

 * @param error location to store reason for failure.

 * @returns the new server, or #NULL on failure.

 */

DBusServer*

_dbus_server_new_for_domain_socket (const char     *path,

                                    dbus_bool_t     abstract,

                                    DBusError      *error)

{

  DBusServer *server;

  int listen_fd;

  DBusString address;

  char *path_copy;

  DBusString path_str;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  if (!_dbus_string_init (&address))

    {

      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);

      return NULL;

    }

  _dbus_string_init_const (&path_str, path);

  if ((abstract &&

       !_dbus_string_append (&address, "unix:abstract=")) ||

      (!abstract &&

       !_dbus_string_append (&address, "unix:path=")) ||

      !_dbus_address_append_escaped (&address, &path_str))

    {

      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);

      goto failed_0;

    }

  path_copy = _dbus_strdup (path);

  if (path_copy == NULL)

    {

      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);

      goto failed_0;

    }

  listen_fd = _dbus_listen_unix_socket (path, abstract, error);

  _dbus_fd_set_close_on_exec (listen_fd);

  if (listen_fd < 0)

    {

      _DBUS_ASSERT_ERROR_IS_SET (error);

      goto failed_1;

    }

  server = _dbus_server_new_for_socket (listen_fd, &address);

  if (server == NULL)

    {

      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);

      goto failed_2;

    }

  _dbus_server_socket_own_filename(server, path_copy);

  _dbus_string_free (&address);

  return server;

 failed_2:

  _dbus_close_socket (listen_fd, NULL);

 failed_1:

  dbus_free (path_copy);

 failed_0:

  _dbus_string_free (&address);

  return NULL;

}

/** @} */