blob: 51673ad1c5c81f8b1dd557a828d050f570eb2296 [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <pthread.h>
#include "sd-bus.h"
#include "bus-error.h"
#include "bus-kernel.h"
#include "bus-match.h"
#include "def.h"
#include "hashmap.h"
#include "list.h"
#include "prioq.h"
#include "socket-util.h"
#include "time-util.h"
/* Note that we use the new /run prefix here (instead of /var/run) since we require them to be aliases and
* that way we become independent of /var being mounted */
#define DEFAULT_SYSTEM_BUS_ADDRESS "unix:path=/run/dbus/system_bus_socket"
#define DEFAULT_USER_BUS_ADDRESS_FMT "unix:path=%s/bus"
struct reply_callback {
sd_bus_message_handler_t callback;
usec_t timeout_usec; /* this is a relative timeout until we reach the BUS_HELLO state, and an absolute one right after */
uint64_t cookie;
unsigned prioq_idx;
struct filter_callback {
sd_bus_message_handler_t callback;
unsigned last_iteration;
LIST_FIELDS(struct filter_callback, callbacks);
struct match_callback {
sd_bus_message_handler_t callback;
sd_bus_message_handler_t install_callback;
sd_bus_slot *install_slot; /* The AddMatch() call */
unsigned last_iteration;
/* Don't dispatch this slot with messages that arrived in any iteration before or at the this
* one. We use this to ensure that matches don't apply "retroactively" and confuse the caller:
* only messages received after the match was installed will be considered. */
uint64_t after;
char *match_string;
struct bus_match_node *match_node;
struct node {
char *path;
struct node *parent;
LIST_HEAD(struct node, child);
LIST_FIELDS(struct node, siblings);
LIST_HEAD(struct node_callback, callbacks);
LIST_HEAD(struct node_vtable, vtables);
LIST_HEAD(struct node_enumerator, enumerators);
LIST_HEAD(struct node_object_manager, object_managers);
struct node_callback {
struct node *node;
bool is_fallback:1;
unsigned last_iteration;
sd_bus_message_handler_t callback;
LIST_FIELDS(struct node_callback, callbacks);
struct node_enumerator {
struct node *node;
sd_bus_node_enumerator_t callback;
unsigned last_iteration;
LIST_FIELDS(struct node_enumerator, enumerators);
struct node_object_manager {
struct node *node;
LIST_FIELDS(struct node_object_manager, object_managers);
struct node_vtable {
struct node *node;
bool is_fallback:1;
unsigned last_iteration;
char *interface;
const sd_bus_vtable *vtable;
sd_bus_object_find_t find;
LIST_FIELDS(struct node_vtable, vtables);
struct vtable_member {
const char *path;
const char *interface;
const char *member;
struct node_vtable *parent;
unsigned last_iteration;
const sd_bus_vtable *vtable;
typedef enum BusSlotType {
} BusSlotType;
struct sd_bus_slot {
unsigned n_ref;
BusSlotType type:8;
/* Slots can be "floating" or not. If they are not floating (the usual case) then they reference the
* bus object they are associated with. This means the bus object stays allocated at least as long as
* there is a slot around associated with it. If it is floating, then the slot's lifecycle is bound
* to the lifecycle of the bus: it will be disconnected from the bus when the bus is destroyed, and
* it keeping the slot reffed hence won't mean the bus stays reffed too. Internally this means the
* reference direction is reversed: floating slots objects are referenced by the bus object, and not
* vice versa. */
bool floating;
bool match_added;
sd_bus *bus;
void *userdata;
sd_bus_destroy_t destroy_callback;
char *description;
LIST_FIELDS(sd_bus_slot, slots);
union {
struct reply_callback reply_callback;
struct filter_callback filter_callback;
struct match_callback match_callback;
struct node_callback node_callback;
struct node_enumerator node_enumerator;
struct node_object_manager node_object_manager;
struct node_vtable node_vtable;
enum bus_state {
BUS_WATCH_BIND, /* waiting for the socket to appear via inotify */
BUS_OPENING, /* the kernel's connect() is still not ready */
BUS_AUTHENTICATING, /* we are currently in the "SASL" authorization phase of dbus */
BUS_HELLO, /* we are waiting for the Hello() response */
static inline bool BUS_IS_OPEN(enum bus_state state) {
return state > BUS_UNSET && state < BUS_CLOSING;
enum bus_auth {
struct sd_bus {
unsigned n_ref;
enum bus_state state;
int input_fd, output_fd;
int inotify_fd;
int message_version;
int message_endian;
bool can_fds:1;
bool bus_client:1;
bool ucred_valid:1;
bool is_server:1;
bool anonymous_auth:1;
bool prefer_readv:1;
bool prefer_writev:1;
bool match_callbacks_modified:1;
bool filter_callbacks_modified:1;
bool nodes_modified:1;
bool trusted:1;
bool manual_peer_interface:1;
bool is_system:1;
bool is_user:1;
bool allow_interactive_authorization:1;
bool exit_on_disconnect:1;
bool exited:1;
bool exit_triggered:1;
bool is_local:1;
bool watch_bind:1;
bool is_monitor:1;
bool accept_fd:1;
bool attach_timestamp:1;
bool connected_signal:1;
bool close_on_exit:1;
signed int use_memfd:2;
void *rbuffer;
size_t rbuffer_size;
sd_bus_message **rqueue;
size_t rqueue_size;
sd_bus_message **wqueue;
size_t wqueue_size;
size_t windex;
uint64_t cookie;
uint64_t read_counter; /* A counter for each incoming msg */
char *unique_name;
uint64_t unique_id;
struct bus_match_node match_callbacks;
Prioq *reply_callbacks_prioq;
OrderedHashmap *reply_callbacks;
LIST_HEAD(struct filter_callback, filter_callbacks);
Hashmap *nodes;
Hashmap *vtable_methods;
Hashmap *vtable_properties;
union sockaddr_union sockaddr;
socklen_t sockaddr_size;
pid_t nspid;
char *machine;
sd_id128_t server_id;
char *address;
unsigned address_index;
int last_connect_error;
enum bus_auth auth;
unsigned auth_index;
struct iovec auth_iovec[3];
size_t auth_rbegin;
char *auth_buffer;
usec_t auth_timeout;
struct ucred ucred;
char *label;
gid_t *groups;
size_t n_groups;
uint64_t creds_mask;
int *fds;
size_t n_fds;
char *exec_path;
char **exec_argv;
/* We do locking around the memfd cache, since we want to
* allow people to process a sd_bus_message in a different
* thread then it was generated on and free it there. Since
* adding something to the memfd cache might happen when a
* message is released, we hence need to protect this bit with
* a mutex. */
pthread_mutex_t memfd_cache_mutex;
struct memfd_cache memfd_cache[MEMFD_CACHE_MAX];
unsigned n_memfd_cache;
pid_t original_pid;
pid_t busexec_pid;
unsigned iteration_counter;
sd_event_source *input_io_event_source;
sd_event_source *output_io_event_source;
sd_event_source *time_event_source;
sd_event_source *quit_event_source;
sd_event_source *inotify_event_source;
sd_event *event;
int event_priority;
pid_t tid;
sd_bus_message *current_message;
sd_bus_slot *current_slot;
sd_bus_message_handler_t current_handler;
void *current_userdata;
sd_bus **default_bus_ptr;
char *description;
char *patch_sender;
sd_bus_track *track_queue;
LIST_HEAD(sd_bus_slot, slots);
LIST_HEAD(sd_bus_track, tracks);
int *inotify_watches;
size_t n_inotify_watches;
/* zero means use value specified by $SYSTEMD_BUS_TIMEOUT= environment variable or built-in default */
usec_t method_call_timeout;
/* For method calls we timeout at 25s, like in the D-Bus reference implementation */
#define BUS_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC))
/* For the authentication phase we grant 90s, to provide extra room during boot, when RNGs and such are not filled up
* with enough entropy yet and might delay the boot */
#define BUS_WQUEUE_MAX (384*1024)
#define BUS_RQUEUE_MAX (384*1024)
#define BUS_MESSAGE_SIZE_MAX (128*1024*1024)
#define BUS_AUTH_SIZE_MAX (64*1024)
/* Note that the D-Bus specification states that bus paths shall have no size limit. We enforce here one
* anyway, since truly unbounded strings are a security problem. The limit we pick is relatively large however,
* to not clash unnecessarily with real-life applications. */
#define BUS_PATH_SIZE_MAX (64*1024)
/* Defined by the specification as maximum size of an array in bytes */
#define BUS_ARRAY_MAX_SIZE 67108864
#define BUS_FDS_MAX 1024
#define BUS_EXEC_ARGV_MAX 256
bool interface_name_is_valid(const char *p) _pure_;
bool service_name_is_valid(const char *p) _pure_;
bool member_name_is_valid(const char *p) _pure_;
bool object_path_is_valid(const char *p) _pure_;
char *object_path_startswith(const char *a, const char *b) _pure_;
bool namespace_complex_pattern(const char *pattern, const char *value) _pure_;
bool path_complex_pattern(const char *pattern, const char *value) _pure_;
bool namespace_simple_pattern(const char *pattern, const char *value) _pure_;
bool path_simple_pattern(const char *pattern, const char *value) _pure_;
int bus_message_type_from_string(const char *s, uint8_t *u) _pure_;
const char *bus_message_type_to_string(uint8_t u) _pure_;
#define error_name_is_valid interface_name_is_valid
sd_bus *bus_resolve(sd_bus *bus);
int bus_ensure_running(sd_bus *bus);
int bus_start_running(sd_bus *bus);
int bus_next_address(sd_bus *bus);
int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m);
int bus_rqueue_make_room(sd_bus *bus);
bool bus_pid_changed(sd_bus *bus);
char *bus_address_escape(const char *v);
int bus_attach_io_events(sd_bus *b);
int bus_attach_inotify_event(sd_bus *b);
void bus_close_inotify_fd(sd_bus *b);
void bus_close_io_fds(sd_bus *b);
#define OBJECT_PATH_FOREACH_PREFIX(prefix, path) \
for (char *_slash = ({ strcpy((prefix), (path)); streq((prefix), "/") ? NULL : strrchr((prefix), '/'); }) ; \
_slash && ((_slash[(_slash) == (prefix)] = 0), true); \
_slash = streq((prefix), "/") ? NULL : strrchr((prefix), '/'))
/* If we are invoking callbacks of a bus object, ensure unreffing the
* bus from the callback doesn't destroy the object we are working on */
#define BUS_DONT_DESTROY(bus) \
_cleanup_(sd_bus_unrefp) _unused_ sd_bus *_dont_destroy_##bus = sd_bus_ref(bus)
int bus_set_address_system(sd_bus *bus);
int bus_set_address_user(sd_bus *bus);
int bus_set_address_system_remote(sd_bus *b, const char *host);
int bus_set_address_machine(sd_bus *b, bool user, const char *machine);
int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error);
#define bus_assert_return(expr, r, error) \
do { \
if (!assert_log(expr, #expr)) \
return sd_bus_error_set_errno(error, r); \
} while (false)
void bus_enter_closing(sd_bus *bus);
void bus_set_state(sd_bus *bus, enum bus_state state);