src/dbus-common.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #ifndef foodbuscommonhfoo
   4 #define foodbuscommonhfoo
   5
   6 /***
   7   This file is part of systemd.
   8
   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 ***/
  24
  25 #include <dbus/dbus.h>
  26
  27 #ifndef DBUS_ERROR_UNKNOWN_OBJECT
  28 #define DBUS_ERROR_UNKNOWN_OBJECT "org.freedesktop.DBus.Error.UnknownObject"
  29 #endif
  30
  31 #ifndef DBUS_ERROR_UNKNOWN_INTERFACE
  32 #define DBUS_ERROR_UNKNOWN_INTERFACE "org.freedesktop.DBus.Error.UnknownInterface"
  33 #endif
  34
  35 #ifndef DBUS_ERROR_UNKNOWN_PROPERTY
  36 #define DBUS_ERROR_UNKNOWN_PROPERTY "org.freedesktop.DBus.Error.UnknownProperty"
  37 #endif
  38
  39 #ifndef DBUS_ERROR_PROPERTY_READ_ONLY
  40 #define DBUS_ERROR_PROPERTY_READ_ONLY "org.freedesktop.DBus.Error.PropertyReadOnly"
  41 #endif
  42
  43 #define BUS_PROPERTIES_INTERFACE                                        \
  44         " <interface name=\"org.freedesktop.DBus.Properties\">\n"       \
  45         "  <method name=\"Get\">\n"                                     \
  46         "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
  47         "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"     \
  48         "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"       \
  49         "  </method>\n"                                                 \
  50         "  <method name=\"GetAll\">\n"                                  \
  51         "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
  52         "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n" \
  53         "  </method>\n"                                                 \
  54         "  <method name=\"Set\">\n"                                     \
  55         "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
  56         "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"     \
  57         "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"        \
  58         "  </method>\n"                                                 \
  59         "  <signal name=\"PropertiesChanged\">\n"                       \
  60         "   <arg type=\"s\" name=\"interface\"/>\n"                     \
  61         "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"        \
  62         "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"       \
  63         "  </signal>\n"                                                 \
  64         " </interface>\n"
  65
  66 #define BUS_INTROSPECTABLE_INTERFACE                                    \
  67         " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"   \
  68         "  <method name=\"Introspect\">\n"                              \
  69         "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"        \
  70         "  </method>\n"                                                 \
  71         " </interface>\n"
  72
  73 #define BUS_PEER_INTERFACE                                              \
  74         "<interface name=\"org.freedesktop.DBus.Peer\">\n"              \
  75         " <method name=\"Ping\"/>\n"                                    \
  76         " <method name=\"GetMachineId\">\n"                             \
  77         "  <arg type=\"s\" name=\"machine_uuid\" direction=\"out\"/>\n" \
  78         " </method>\n"                                                  \
  79         "</interface>\n"
  80
  81 #define BUS_GENERIC_INTERFACES_LIST             \
  82         "org.freedesktop.DBus.Properties\0"     \
  83         "org.freedesktop.DBus.Introspectable\0" \
  84         "org.freedesktop.DBus.Peer\0"
  85
  86 int bus_check_peercred(DBusConnection *c);
  87
  88 int bus_connect(DBusBusType t, DBusConnection **_bus, bool *private_bus, DBusError *error);
  89
  90 int bus_connect_system_ssh(const char *user, const char *host, DBusConnection **_bus, DBusError *error);
  91 int bus_connect_system_polkit(DBusConnection **_bus, DBusError *error);
  92
  93 const char *bus_error_message(const DBusError *error);
  94
  95 typedef int (*BusPropertyCallback)(DBusMessageIter *iter, const char *property, void *data);
  96 typedef int (*BusPropertySetCallback)(DBusMessageIter *iter, const char *property, void *data);
  97
  98 typedef struct BusProperty {
  99         const char *property;            /* name of the property */
 100         BusPropertyCallback append;      /* Function that is called to serialize this property */
 101         const char *signature;
 102         const uint16_t offset;           /* Offset from BusBoundProperties::base address to the property data.
 103                                           * uint16_t is sufficient, because we have no structs too big.
 104                                           * -Werror=overflow will catch it if this does not hold. */
 105         bool indirect;                   /* data is indirect, ie. not base+offset, but *(base+offset) */
 106         BusPropertySetCallback set;      /* Optional: Function that is called to set this property */
 107 } BusProperty;
 108
 109 typedef struct BusBoundProperties {
 110         const char *interface;           /* interface of the properties */
 111         const BusProperty *properties;   /* array of properties, ended by a NULL-filled element */
 112         const void *const base;          /* base pointer to which the offset must be added to reach data */
 113 } BusBoundProperties;
 114
 115 DBusHandlerResult bus_send_error_reply(
 116                 DBusConnection *c,
 117                 DBusMessage *message,
 118                 DBusError *bus_error,
 119                 int error);
 120
 121 DBusHandlerResult bus_default_message_handler(
 122                 DBusConnection *c,
 123                 DBusMessage *message,
 124                 const char *introspection,
 125                 const char *interfaces,
 126                 const BusBoundProperties *bound_properties);
 127
 128 int bus_property_append_string(DBusMessageIter *i, const char *property, void *data);
 129 int bus_property_append_strv(DBusMessageIter *i, const char *property, void *data);
 130 int bus_property_append_bool(DBusMessageIter *i, const char *property, void *data);
 131 int bus_property_append_tristate_false(DBusMessageIter *i, const char *property, void *data);
 132 int bus_property_append_int32(DBusMessageIter *i, const char *property, void *data);
 133 int bus_property_append_uint32(DBusMessageIter *i, const char *property, void *data);
 134 int bus_property_append_uint64(DBusMessageIter *i, const char *property, void *data);
 135 int bus_property_append_size(DBusMessageIter *i, const char *property, void *data);
 136 int bus_property_append_ul(DBusMessageIter *i, const char *property, void *data);
 137 int bus_property_append_long(DBusMessageIter *i, const char *property, void *data);
 138
 139 #define bus_property_append_int bus_property_append_int32
 140 #define bus_property_append_pid bus_property_append_uint32
 141 #define bus_property_append_uid bus_property_append_uint32
 142 #define bus_property_append_gid bus_property_append_uint32
 143 #define bus_property_append_mode bus_property_append_uint32
 144 #define bus_property_append_unsigned bus_property_append_uint32
 145 #define bus_property_append_usec bus_property_append_uint64
 146
 147 #define DEFINE_BUS_PROPERTY_APPEND_ENUM(function,name,type)             \
 148         int function(DBusMessageIter *i, const char *property, void *data) { \
 149                 const char *value;                                      \
 150                 type *field = data;                                     \
 151                                                                         \
 152                 assert(i);                                              \
 153                 assert(property);                                       \
 154                                                                         \
 155                 value = name##_to_string(*field);                       \
 156                                                                         \
 157                 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &value)) \
 158                         return -ENOMEM;                                 \
 159                                                                         \
 160                 return 0;                                               \
 161         }
 162
 163 #define DEFINE_BUS_PROPERTY_SET_ENUM(function,name,type)                \
 164         int function(DBusMessageIter *i, const char *property, void *data) { \
 165                 const char *value;                                      \
 166                 type *field = data;                                     \
 167                                                                         \
 168                 assert(i);                                              \
 169                 assert(property);                                       \
 170                                                                         \
 171                 dbus_message_iter_get_basic(i, &value);                 \
 172                                                                         \
 173                 *field = name##_from_string(value);                     \
 174                                                                         \
 175                 return 0;                                               \
 176         }
 177
 178 const char *bus_errno_to_dbus(int error);
 179
 180 DBusMessage* bus_properties_changed_new(const char *path, const char *interface, const char *properties);
 181
 182 uint32_t bus_flags_to_events(DBusWatch *bus_watch);
 183 unsigned bus_events_to_flags(uint32_t events);
 184
 185 int bus_parse_strv(DBusMessage *m, char ***_l);
 186 int bus_parse_strv_iter(DBusMessageIter *iter, char ***_l);
 187
 188 int bus_append_strv_iter(DBusMessageIter *iter, char **l);
 189
 190 int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next);
 191
 192 int generic_print_property(const char *name, DBusMessageIter *iter, bool all);
 193
 194 void bus_async_unregister_and_exit(DBusConnection *bus, const char *name);
 195
 196 DBusHandlerResult bus_exit_idle_filter(DBusConnection *bus, DBusMessage *m, void *userdata);
 197
 198 #endif