1/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2/* dbus-transport-protected.h Used by subclasses of DBusTransport object (internal to D-Bus implementation)
3 *
4 * Copyright (C) 2002, 2004  Red Hat Inc.
5 *
6 * Licensed under the Academic Free License version 2.1
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
21 *
22 */
23#ifndef DBUS_TRANSPORT_PROTECTED_H
24#define DBUS_TRANSPORT_PROTECTED_H
25
26#include <dbus/dbus-internals.h>
27#include <dbus/dbus-errors.h>
28#include <dbus/dbus-transport.h>
29#include <dbus/dbus-message-internal.h>
30#include <dbus/dbus-auth.h>
31#include <dbus/dbus-resources.h>
32
33DBUS_BEGIN_DECLS
34
35typedef struct DBusTransportVTable DBusTransportVTable;
36
37/**
38 * The virtual table that must be implemented to
39 * create a new kind of transport.
40 */
41struct DBusTransportVTable
42{
43  void        (* finalize)              (DBusTransport *transport);
44  /**< The finalize method must free the transport. */
45
46  dbus_bool_t (* handle_watch)          (DBusTransport *transport,
47                                         DBusWatch     *watch,
48                                         unsigned int   flags);
49  /**< The handle_watch method handles reading/writing
50   * data as indicated by the flags.
51   */
52
53  void        (* disconnect)            (DBusTransport *transport);
54  /**< Disconnect this transport. */
55
56  dbus_bool_t (* connection_set)        (DBusTransport *transport);
57  /**< Called when transport->connection has been filled in */
58
59  void        (* do_iteration)          (DBusTransport *transport,
60                                         unsigned int   flags,
61                                         int            timeout_milliseconds);
62  /**< Called to do a single "iteration" (block on select/poll
63   * followed by reading or writing data).
64   */
65
66  void        (* live_messages_changed) (DBusTransport *transport);
67  /**< Outstanding messages counter changed */
68
69  dbus_bool_t (* get_socket_fd) (DBusTransport *transport,
70                                 int           *fd_p);
71  /**< Get socket file descriptor */
72};
73
74/**
75 * Object representing a transport such as a socket.
76 * A transport can shuttle messages from point A to point B,
77 * and is the backend for a #DBusConnection.
78 *
79 */
80struct DBusTransport
81{
82  int refcount;                               /**< Reference count. */
83
84  const DBusTransportVTable *vtable;          /**< Virtual methods for this instance. */
85
86  DBusConnection *connection;                 /**< Connection owning this transport. */
87
88  DBusMessageLoader *loader;                  /**< Message-loading buffer. */
89
90  DBusAuth *auth;                             /**< Authentication conversation */
91
92  DBusCredentials *credentials;               /**< Credentials of other end read from the socket */
93
94  long max_live_messages_size;                /**< Max total size of received messages. */
95  long max_live_messages_unix_fds;            /**< Max total unix fds of received messages. */
96
97  DBusCounter *live_messages;                 /**< Counter for size/unix fds of all live messages. */
98
99  char *address;                              /**< Address of the server we are connecting to (#NULL for the server side of a transport) */
100
101  char *expected_guid;                        /**< GUID we expect the server to have, #NULL on server side or if we don't have an expectation */
102
103  DBusAllowUnixUserFunction unix_user_function; /**< Function for checking whether a user is authorized. */
104  void *unix_user_data;                         /**< Data for unix_user_function */
105
106  DBusFreeFunction free_unix_user_data;         /**< Function to free unix_user_data */
107
108  DBusAllowWindowsUserFunction windows_user_function; /**< Function for checking whether a user is authorized. */
109  void *windows_user_data;                            /**< Data for windows_user_function */
110
111  DBusFreeFunction free_windows_user_data;            /**< Function to free windows_user_data */
112
113  unsigned int disconnected : 1;              /**< #TRUE if we are disconnected. */
114  unsigned int authenticated : 1;             /**< Cache of auth state; use _dbus_transport_get_is_authenticated() to query value */
115  unsigned int send_credentials_pending : 1;  /**< #TRUE if we need to send credentials */
116  unsigned int receive_credentials_pending : 1; /**< #TRUE if we need to receive credentials */
117  unsigned int is_server : 1;                 /**< #TRUE if on the server side */
118  unsigned int unused_bytes_recovered : 1;    /**< #TRUE if we've recovered unused bytes from auth */
119  unsigned int allow_anonymous : 1;           /**< #TRUE if an anonymous client can connect */
120};
121
122dbus_bool_t _dbus_transport_init_base     (DBusTransport             *transport,
123                                           const DBusTransportVTable *vtable,
124                                           const DBusString          *server_guid,
125                                           const DBusString          *address);
126void        _dbus_transport_finalize_base (DBusTransport             *transport);
127
128
129typedef enum
130{
131  DBUS_TRANSPORT_OPEN_NOT_HANDLED,    /**< we aren't in charge of this address type */
132  DBUS_TRANSPORT_OPEN_OK,             /**< we set up the listen */
133  DBUS_TRANSPORT_OPEN_BAD_ADDRESS,    /**< malformed address */
134  DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT /**< well-formed address but failed to set it up */
135} DBusTransportOpenResult;
136
137DBusTransportOpenResult _dbus_transport_open_platform_specific (DBusAddressEntry  *entry,
138                                                                DBusTransport    **transport_p,
139                                                                DBusError         *error);
140
141#define DBUS_TRANSPORT_CAN_SEND_UNIX_FD(x)      \
142  _dbus_auth_get_unix_fd_negotiated((x)->auth)
143
144DBUS_END_DECLS
145
146#endif /* DBUS_TRANSPORT_PROTECTED_H */
147