src/libsystemd/sd-bus/bus-util.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2013 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include "sd-event.h"
  25 #include "sd-bus.h"
  26 #include "hashmap.h"
  27 #include "time-util.h"
  28 #include "util.h"
  29
  30 typedef enum BusTransport {
  31         BUS_TRANSPORT_LOCAL,
  32         BUS_TRANSPORT_REMOTE,
  33         BUS_TRANSPORT_CONTAINER,
  34         _BUS_TRANSPORT_MAX,
  35         _BUS_TRANSPORT_INVALID = -1
  36 } BusTransport;
  37
  38 typedef int (*bus_property_set_t) (sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata);
  39
  40 struct bus_properties_map {
  41         const char *member;
  42         const char *signature;
  43         bus_property_set_t set;
  44         size_t offset;
  45 };
  46
  47 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata);
  48
  49 int bus_map_all_properties(sd_bus *bus,
  50                            const char *destination,
  51                            const char *path,
  52                            const struct bus_properties_map *map,
  53                            void *userdata);
  54
  55 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name);
  56
  57 typedef bool (*check_idle_t)(void *userdata);
  58
  59 int bus_event_loop_with_idle(sd_event *e, sd_bus *bus, const char *name, usec_t timeout, check_idle_t check_idle, void *userdata);
  60
  61 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error);
  62
  63 int bus_check_peercred(sd_bus *c);
  64
  65 int bus_verify_polkit(sd_bus_message *call, int capability, const char *action, bool interactive, bool *_challenge, sd_bus_error *e);
  66
  67 int bus_verify_polkit_async(sd_bus_message *call, int capability, const char *action, bool interactive, Hashmap **registry, sd_bus_error *error);
  68 void bus_verify_polkit_async_registry_free(Hashmap *registry);
  69
  70 int bus_open_system_systemd(sd_bus **_bus);
  71 int bus_open_user_systemd(sd_bus **_bus);
  72
  73 int bus_open_transport(BusTransport transport, const char *host, bool user, sd_bus **bus);
  74 int bus_open_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus);
  75
  76 int bus_print_property(const char *name, sd_bus_message *property, bool all);
  77 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all);
  78
  79 int bus_property_get_bool(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error);
  80
  81 #define bus_property_get_usec ((sd_bus_property_get_t) NULL)
  82 #define bus_property_set_usec ((sd_bus_property_set_t) NULL)
  83
  84 assert_cc(sizeof(int) == sizeof(int32_t));
  85 #define bus_property_get_int ((sd_bus_property_get_t) NULL)
  86
  87 assert_cc(sizeof(unsigned) == sizeof(unsigned));
  88 #define bus_property_get_unsigned ((sd_bus_property_get_t) NULL)
  89
  90 /* On 64bit machines we can use the default serializer for size_t and
  91  * friends, otherwise we need to cast this manually */
  92 #if __SIZEOF_SIZE_T__ == 8
  93 #define bus_property_get_size ((sd_bus_property_get_t) NULL)
  94 #else
  95 int bus_property_get_size(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error);
  96 #endif
  97
  98 #if __SIZEOF_LONG__ == 8
  99 #define bus_property_get_long ((sd_bus_property_get_t) NULL)
 100 #define bus_property_get_ulong ((sd_bus_property_get_t) NULL)
 101 #else
 102 int bus_property_get_long(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error);
 103 int bus_property_get_ulong(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error);
 104 #endif
 105
 106 /* uid_t and friends on Linux 32 bit. This means we can just use the
 107  * default serializer for 32bit unsigned, for serializing it, and map
 108  * it to NULL here */
 109 assert_cc(sizeof(uid_t) == sizeof(uint32_t));
 110 #define bus_property_get_uid ((sd_bus_property_get_t) NULL)
 111
 112 assert_cc(sizeof(gid_t) == sizeof(uint32_t));
 113 #define bus_property_get_gid ((sd_bus_property_get_t) NULL)
 114
 115 assert_cc(sizeof(pid_t) == sizeof(uint32_t));
 116 #define bus_property_get_pid ((sd_bus_property_get_t) NULL)
 117
 118 assert_cc(sizeof(mode_t) == sizeof(uint32_t));
 119 #define bus_property_get_mode ((sd_bus_property_get_t) NULL)
 120
 121 int bus_log_parse_error(int r);
 122 int bus_log_create_error(int r);
 123
 124 typedef struct UnitInfo {
 125         const char *machine;
 126         const char *id;
 127         const char *description;
 128         const char *load_state;
 129         const char *active_state;
 130         const char *sub_state;
 131         const char *following;
 132         const char *unit_path;
 133         uint32_t job_id;
 134         const char *job_type;
 135         const char *job_path;
 136 } UnitInfo;
 137
 138 int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u);
 139
 140 static inline void sd_bus_close_unrefp(sd_bus **bus) {
 141         if (*bus) {
 142                 sd_bus_flush(*bus);
 143                 sd_bus_close(*bus);
 144                 sd_bus_unref(*bus);
 145         }
 146 }
 147
 148 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus*, sd_bus_unref);
 149 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus_slot*, sd_bus_slot_unref);
 150 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus_message*, sd_bus_message_unref);
 151 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus_creds*, sd_bus_creds_unref);
 152 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus_track*, sd_bus_track_unref);
 153
 154 #define _cleanup_bus_unref_ _cleanup_(sd_bus_unrefp)
 155 #define _cleanup_bus_close_unref_ _cleanup_(sd_bus_close_unrefp)
 156 #define _cleanup_bus_slot_unref_ _cleanup_(sd_bus_slot_unrefp)
 157 #define _cleanup_bus_message_unref_ _cleanup_(sd_bus_message_unrefp)
 158 #define _cleanup_bus_creds_unref_ _cleanup_(sd_bus_creds_unrefp)
 159 #define _cleanup_bus_track_unref_ _cleanup_(sd_bus_slot_unrefp)
 160 #define _cleanup_bus_error_free_ _cleanup_(sd_bus_error_free)
 161
 162 #define BUS_DEFINE_PROPERTY_GET_ENUM(function, name, type)              \
 163         int function(sd_bus *bus,                                       \
 164                      const char *path,                                  \
 165                      const char *interface,                             \
 166                      const char *property,                              \
 167                      sd_bus_message *reply,                             \
 168                      void *userdata,                                    \
 169                      sd_bus_error *error) {                             \
 170                                                                         \
 171                 const char *value;                                      \
 172                 type *field = userdata;                                 \
 173                 int r;                                                  \
 174                                                                         \
 175                 assert(bus);                                            \
 176                 assert(reply);                                          \
 177                 assert(field);                                          \
 178                                                                         \
 179                 value = strempty(name##_to_string(*field));             \
 180                                                                         \
 181                 r = sd_bus_message_append_basic(reply, 's', value);     \
 182                 if (r < 0)                                              \
 183                         return r;                                       \
 184                                                                         \
 185                 return 1;                                               \
 186         }                                                               \
 187         struct __useless_struct_to_allow_trailing_semicolon__
 188
 189 #define BUS_PROPERTY_DUAL_TIMESTAMP(name, offset, flags) \
 190         SD_BUS_PROPERTY(name, "t", bus_property_get_usec, (offset) + offsetof(struct dual_timestamp, realtime), (flags)), \
 191         SD_BUS_PROPERTY(name "Monotonic", "t", bus_property_get_usec, (offset) + offsetof(struct dual_timestamp, monotonic), (flags))
 192
 193 int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error);
 194
 195 int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignment);