329 lines
8.6 KiB
C
329 lines
8.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#include "hashmap.h"
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#include "prioq.h"
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#include "list.h"
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#include "util.h"
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#include "refcnt.h"
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#include "sd-bus.h"
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#include "bus-error.h"
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#include "bus-match.h"
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#include "bus-kernel.h"
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#include "kdbus.h"
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struct reply_callback {
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sd_bus_message_handler_t callback;
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void *userdata;
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usec_t timeout;
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uint64_t cookie;
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unsigned prioq_idx;
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};
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struct filter_callback {
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sd_bus_message_handler_t callback;
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void *userdata;
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unsigned last_iteration;
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LIST_FIELDS(struct filter_callback, callbacks);
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};
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struct node {
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char *path;
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struct node *parent;
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LIST_HEAD(struct node, child);
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LIST_FIELDS(struct node, siblings);
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LIST_HEAD(struct node_callback, callbacks);
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LIST_HEAD(struct node_vtable, vtables);
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LIST_HEAD(struct node_enumerator, enumerators);
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bool object_manager;
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};
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struct node_callback {
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struct node *node;
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bool is_fallback;
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sd_bus_message_handler_t callback;
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void *userdata;
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unsigned last_iteration;
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LIST_FIELDS(struct node_callback, callbacks);
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};
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struct node_enumerator {
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struct node *node;
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sd_bus_node_enumerator_t callback;
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void *userdata;
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unsigned last_iteration;
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LIST_FIELDS(struct node_enumerator, enumerators);
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};
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struct node_vtable {
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struct node *node;
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char *interface;
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bool is_fallback;
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const sd_bus_vtable *vtable;
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void *userdata;
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sd_bus_object_find_t find;
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unsigned last_iteration;
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LIST_FIELDS(struct node_vtable, vtables);
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};
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struct vtable_member {
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const char *path;
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const char *interface;
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const char *member;
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struct node_vtable *parent;
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unsigned last_iteration;
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const sd_bus_vtable *vtable;
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};
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enum bus_state {
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BUS_UNSET,
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BUS_OPENING,
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BUS_AUTHENTICATING,
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BUS_HELLO,
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BUS_RUNNING,
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BUS_CLOSING,
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BUS_CLOSED
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};
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static inline bool BUS_IS_OPEN(enum bus_state state) {
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return state > BUS_UNSET && state < BUS_CLOSING;
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}
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enum bus_auth {
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_BUS_AUTH_INVALID,
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BUS_AUTH_EXTERNAL,
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BUS_AUTH_ANONYMOUS
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};
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struct sd_bus {
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/* We use atomic ref counting here since sd_bus_message
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objects retain references to their originating sd_bus but
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we want to allow them to be processed in a different
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thread. We won't provide full thread safety, but only the
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bare minimum that makes it possible to use sd_bus and
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sd_bus_message objects independently and on different
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threads as long as each object is used only once at the
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same time. */
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RefCount n_ref;
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enum bus_state state;
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int input_fd, output_fd;
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int message_version;
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int message_endian;
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bool is_kernel:1;
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bool can_fds:1;
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bool bus_client:1;
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bool ucred_valid:1;
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bool is_server:1;
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bool anonymous_auth:1;
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bool prefer_readv:1;
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bool prefer_writev:1;
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bool match_callbacks_modified:1;
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bool filter_callbacks_modified:1;
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bool nodes_modified:1;
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bool trusted:1;
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bool fake_creds_valid:1;
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bool manual_peer_interface:1;
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int use_memfd;
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void *rbuffer;
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size_t rbuffer_size;
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sd_bus_message **rqueue;
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unsigned rqueue_size;
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size_t rqueue_allocated;
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sd_bus_message **wqueue;
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unsigned wqueue_size;
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size_t windex;
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size_t wqueue_allocated;
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uint64_t cookie;
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char *unique_name;
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uint64_t unique_id;
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struct bus_match_node match_callbacks;
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Prioq *reply_callbacks_prioq;
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Hashmap *reply_callbacks;
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LIST_HEAD(struct filter_callback, filter_callbacks);
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Hashmap *nodes;
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Hashmap *vtable_methods;
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Hashmap *vtable_properties;
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union {
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struct sockaddr sa;
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struct sockaddr_un un;
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struct sockaddr_in in;
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struct sockaddr_in6 in6;
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} sockaddr;
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socklen_t sockaddr_size;
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char *kernel;
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char *machine;
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sd_id128_t server_id;
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char *address;
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unsigned address_index;
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int last_connect_error;
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enum bus_auth auth;
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size_t auth_rbegin;
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struct iovec auth_iovec[3];
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unsigned auth_index;
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char *auth_buffer;
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usec_t auth_timeout;
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struct ucred ucred;
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char label[NAME_MAX];
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uint64_t creds_mask;
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int *fds;
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unsigned n_fds;
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char *exec_path;
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char **exec_argv;
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uint64_t hello_cookie;
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unsigned iteration_counter;
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void *kdbus_buffer;
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/* We do locking around the memfd cache, since we want to
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* allow people to process a sd_bus_message in a different
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* thread then it was generated on and free it there. Since
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* adding something to the memfd cache might happen when a
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* message is released, we hence need to protect this bit with
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* a mutex. */
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pthread_mutex_t memfd_cache_mutex;
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struct memfd_cache memfd_cache[MEMFD_CACHE_MAX];
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unsigned n_memfd_cache;
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pid_t original_pid;
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uint64_t hello_flags;
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uint64_t attach_flags;
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uint64_t match_cookie;
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sd_event_source *input_io_event_source;
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sd_event_source *output_io_event_source;
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sd_event_source *time_event_source;
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sd_event_source *quit_event_source;
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sd_event *event;
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int event_priority;
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sd_bus_message *current;
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sd_bus **default_bus_ptr;
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pid_t tid;
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struct kdbus_creds fake_creds;
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char *fake_label;
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char *cgroup_root;
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};
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#define BUS_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC))
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#define BUS_WQUEUE_MAX 1024
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#define BUS_RQUEUE_MAX 64*1024
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#define BUS_MESSAGE_SIZE_MAX (64*1024*1024)
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#define BUS_AUTH_SIZE_MAX (64*1024)
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#define BUS_CONTAINER_DEPTH 128
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/* Defined by the specification as maximum size of an array in
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* bytes */
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#define BUS_ARRAY_MAX_SIZE 67108864
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#define BUS_FDS_MAX 1024
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#define BUS_EXEC_ARGV_MAX 256
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bool interface_name_is_valid(const char *p) _pure_;
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bool service_name_is_valid(const char *p) _pure_;
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bool member_name_is_valid(const char *p) _pure_;
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bool object_path_is_valid(const char *p) _pure_;
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char *object_path_startswith(const char *a, const char *b) _pure_;
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bool namespace_complex_pattern(const char *pattern, const char *value) _pure_;
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bool path_complex_pattern(const char *pattern, const char *value) _pure_;
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bool namespace_simple_pattern(const char *pattern, const char *value) _pure_;
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bool path_simple_pattern(const char *pattern, const char *value) _pure_;
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int bus_message_type_from_string(const char *s, uint8_t *u) _pure_;
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const char *bus_message_type_to_string(uint8_t u) _pure_;
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#define error_name_is_valid interface_name_is_valid
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int bus_ensure_running(sd_bus *bus);
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int bus_start_running(sd_bus *bus);
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int bus_next_address(sd_bus *bus);
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int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m);
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int bus_rqueue_make_room(sd_bus *bus);
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bool bus_pid_changed(sd_bus *bus);
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char *bus_address_escape(const char *v);
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#define OBJECT_PATH_FOREACH_PREFIX(prefix, path) \
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for (char *_slash = ({ strcpy((prefix), (path)); streq((prefix), "/") ? NULL : strrchr((prefix), '/'); }) ; \
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_slash && !(_slash[(_slash) == (prefix)] = 0); \
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_slash = streq((prefix), "/") ? NULL : strrchr((prefix), '/'))
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/* If we are invoking callbacks of a bus object, ensure unreffing the
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* bus from the callback doesn't destroy the object we are working
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* on */
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#define BUS_DONT_DESTROY(bus) \
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_cleanup_bus_unref_ _unused_ sd_bus *_dont_destroy_##bus = sd_bus_ref(bus)
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