2 This file is part of systemd.
4 Copyright 2013 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
30 #include "alloc-util.h"
31 #include "bus-container.h"
32 #include "bus-control.h"
33 #include "bus-internal.h"
34 #include "bus-kernel.h"
35 #include "bus-label.h"
36 #include "bus-message.h"
37 #include "bus-objects.h"
38 #include "bus-protocol.h"
40 #include "bus-socket.h"
41 #include "bus-track.h"
44 #include "cgroup-util.h"
47 #include "hexdecoct.h"
48 #include "hostname-util.h"
51 #include "parse-util.h"
52 #include "string-util.h"
56 #define log_debug_bus_message(m) \
58 sd_bus_message *_mm = (m); \
59 log_debug("Got message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s", \
60 bus_message_type_to_string(_mm->header->type), \
61 strna(sd_bus_message_get_sender(_mm)), \
62 strna(sd_bus_message_get_destination(_mm)), \
63 strna(sd_bus_message_get_path(_mm)), \
64 strna(sd_bus_message_get_interface(_mm)), \
65 strna(sd_bus_message_get_member(_mm)), \
66 BUS_MESSAGE_COOKIE(_mm), \
68 strna(_mm->error.message)); \
71 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
72 static int attach_io_events(sd_bus *b);
73 static void detach_io_events(sd_bus *b);
75 static thread_local sd_bus *default_system_bus = NULL;
76 #if 0 /// UNNEEDED by elogind
77 static thread_local sd_bus *default_user_bus = NULL;
79 static thread_local sd_bus *default_starter_bus = NULL;
81 static void bus_close_fds(sd_bus *b) {
86 if (b->input_fd != b->output_fd)
87 safe_close(b->output_fd);
88 b->output_fd = b->input_fd = safe_close(b->input_fd);
91 static void bus_reset_queues(sd_bus *b) {
94 while (b->rqueue_size > 0)
95 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
97 b->rqueue = mfree(b->rqueue);
98 b->rqueue_allocated = 0;
100 while (b->wqueue_size > 0)
101 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
103 b->wqueue = mfree(b->wqueue);
104 b->wqueue_allocated = 0;
107 static void bus_free(sd_bus *b) {
111 assert(!b->track_queue);
114 b->state = BUS_CLOSED;
116 sd_bus_detach_event(b);
118 while ((s = b->slots)) {
119 /* At this point only floating slots can still be
120 * around, because the non-floating ones keep a
121 * reference to the bus, and we thus couldn't be
122 * destructing right now... We forcibly disconnect the
123 * slots here, so that they still can be referenced by
124 * apps, but are dead. */
127 bus_slot_disconnect(s);
128 sd_bus_slot_unref(s);
131 if (b->default_bus_ptr)
132 *b->default_bus_ptr = NULL;
137 munmap(b->kdbus_buffer, KDBUS_POOL_SIZE);
141 free(b->unique_name);
142 free(b->auth_buffer);
147 free(b->cgroup_root);
148 free(b->description);
151 strv_free(b->exec_argv);
153 close_many(b->fds, b->n_fds);
158 ordered_hashmap_free_free(b->reply_callbacks);
159 prioq_free(b->reply_callbacks_prioq);
161 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
162 bus_match_free(&b->match_callbacks);
164 hashmap_free_free(b->vtable_methods);
165 hashmap_free_free(b->vtable_properties);
167 assert(hashmap_isempty(b->nodes));
168 hashmap_free(b->nodes);
170 bus_kernel_flush_memfd(b);
172 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
177 _public_ int sd_bus_new(sd_bus **ret) {
180 assert_return(ret, -EINVAL);
186 r->n_ref = REFCNT_INIT;
187 r->input_fd = r->output_fd = -1;
188 r->message_version = 1;
189 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
190 r->hello_flags |= KDBUS_HELLO_ACCEPT_FD;
191 r->attach_flags |= KDBUS_ATTACH_NAMES;
192 r->original_pid = getpid();
194 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
196 /* We guarantee that wqueue always has space for at least one
198 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
207 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
210 assert_return(bus, -EINVAL);
211 assert_return(bus->state == BUS_UNSET, -EPERM);
212 assert_return(address, -EINVAL);
213 assert_return(!bus_pid_changed(bus), -ECHILD);
225 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
226 assert_return(bus, -EINVAL);
227 assert_return(bus->state == BUS_UNSET, -EPERM);
228 assert_return(input_fd >= 0, -EBADF);
229 assert_return(output_fd >= 0, -EBADF);
230 assert_return(!bus_pid_changed(bus), -ECHILD);
232 bus->input_fd = input_fd;
233 bus->output_fd = output_fd;
237 #if 0 /// UNNEEDED by elogind
238 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
241 assert_return(bus, -EINVAL);
242 assert_return(bus->state == BUS_UNSET, -EPERM);
243 assert_return(path, -EINVAL);
244 assert_return(!strv_isempty(argv), -EINVAL);
245 assert_return(!bus_pid_changed(bus), -ECHILD);
257 free(bus->exec_path);
258 strv_free(bus->exec_argv);
267 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
268 assert_return(bus, -EINVAL);
269 assert_return(bus->state == BUS_UNSET, -EPERM);
270 assert_return(!bus_pid_changed(bus), -ECHILD);
272 bus->bus_client = !!b;
276 #if 0 /// UNNEEDED by elogind
277 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
278 assert_return(bus, -EINVAL);
279 assert_return(bus->state == BUS_UNSET, -EPERM);
280 assert_return(!bus_pid_changed(bus), -ECHILD);
282 SET_FLAG(bus->hello_flags, KDBUS_HELLO_MONITOR, b);
287 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
288 assert_return(bus, -EINVAL);
289 assert_return(bus->state == BUS_UNSET, -EPERM);
290 assert_return(!bus_pid_changed(bus), -ECHILD);
292 SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b);
296 #if 0 /// UNNEEDED by elogind
297 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
299 assert_return(bus, -EINVAL);
300 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
301 assert_return(!bus_pid_changed(bus), -ECHILD);
303 new_flags = bus->attach_flags;
304 SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b);
306 if (bus->attach_flags == new_flags)
309 bus->attach_flags = new_flags;
310 if (bus->state != BUS_UNSET && bus->is_kernel)
311 bus_kernel_realize_attach_flags(bus);
316 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
319 assert_return(bus, -EINVAL);
320 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
321 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
322 assert_return(!bus_pid_changed(bus), -ECHILD);
324 SET_FLAG(bus->creds_mask, mask, b);
326 /* The well knowns we need unconditionally, so that matches can work */
327 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
329 /* Make sure we don't lose the timestamp flag */
330 new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask);
331 if (bus->attach_flags == new_flags)
334 bus->attach_flags = new_flags;
335 if (bus->state != BUS_UNSET && bus->is_kernel)
336 bus_kernel_realize_attach_flags(bus);
342 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
343 assert_return(bus, -EINVAL);
344 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
345 assert_return(bus->state == BUS_UNSET, -EPERM);
346 assert_return(!bus_pid_changed(bus), -ECHILD);
348 bus->is_server = !!b;
349 bus->server_id = server_id;
353 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
354 assert_return(bus, -EINVAL);
355 assert_return(bus->state == BUS_UNSET, -EPERM);
356 assert_return(!bus_pid_changed(bus), -ECHILD);
358 bus->anonymous_auth = !!b;
362 #if 0 /// UNNEEDED by elogind
363 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
364 assert_return(bus, -EINVAL);
365 assert_return(bus->state == BUS_UNSET, -EPERM);
366 assert_return(!bus_pid_changed(bus), -ECHILD);
372 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
373 assert_return(bus, -EINVAL);
374 assert_return(bus->state == BUS_UNSET, -EPERM);
375 assert_return(!bus_pid_changed(bus), -ECHILD);
377 return free_and_strdup(&bus->description, description);
381 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
382 assert_return(bus, -EINVAL);
383 assert_return(!bus_pid_changed(bus), -ECHILD);
385 bus->allow_interactive_authorization = !!b;
389 #if 0 /// UNNEEDED by elogind
390 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
391 assert_return(bus, -EINVAL);
392 assert_return(!bus_pid_changed(bus), -ECHILD);
394 return bus->allow_interactive_authorization;
398 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
406 assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING);
408 r = sd_bus_message_get_errno(reply);
412 r = sd_bus_message_read(reply, "s", &s);
416 if (!service_name_is_valid(s) || s[0] != ':')
419 bus->unique_name = strdup(s);
420 if (!bus->unique_name)
423 if (bus->state == BUS_HELLO)
424 bus->state = BUS_RUNNING;
429 static int bus_send_hello(sd_bus *bus) {
430 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
435 if (!bus->bus_client || bus->is_kernel)
438 r = sd_bus_message_new_method_call(
441 "org.freedesktop.DBus",
442 "/org/freedesktop/DBus",
443 "org.freedesktop.DBus",
448 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
451 int bus_start_running(sd_bus *bus) {
454 if (bus->bus_client && !bus->is_kernel) {
455 bus->state = BUS_HELLO;
459 bus->state = BUS_RUNNING;
463 static int parse_address_key(const char **p, const char *key, char **value) {
464 size_t l, n = 0, allocated = 0;
474 if (strncmp(*p, key, l) != 0)
487 while (*a != ';' && *a != ',' && *a != 0) {
505 c = (char) ((x << 4) | y);
512 if (!GREEDY_REALLOC(r, allocated, n + 2))
536 static void skip_address_key(const char **p) {
540 *p += strcspn(*p, ",");
546 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
547 _cleanup_free_ char *path = NULL, *abstract = NULL;
556 while (**p != 0 && **p != ';') {
557 r = parse_address_key(p, "guid", guid);
563 r = parse_address_key(p, "path", &path);
569 r = parse_address_key(p, "abstract", &abstract);
578 if (!path && !abstract)
581 if (path && abstract)
586 if (l > sizeof(b->sockaddr.un.sun_path))
589 b->sockaddr.un.sun_family = AF_UNIX;
590 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
591 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
592 } else if (abstract) {
593 l = strlen(abstract);
594 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
597 b->sockaddr.un.sun_family = AF_UNIX;
598 b->sockaddr.un.sun_path[0] = 0;
599 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
600 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
606 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
607 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
609 struct addrinfo *result, hints = {
610 .ai_socktype = SOCK_STREAM,
611 .ai_flags = AI_ADDRCONFIG,
619 while (**p != 0 && **p != ';') {
620 r = parse_address_key(p, "guid", guid);
626 r = parse_address_key(p, "host", &host);
632 r = parse_address_key(p, "port", &port);
638 r = parse_address_key(p, "family", &family);
651 if (streq(family, "ipv4"))
652 hints.ai_family = AF_INET;
653 else if (streq(family, "ipv6"))
654 hints.ai_family = AF_INET6;
659 r = getaddrinfo(host, port, &hints, &result);
663 return -EADDRNOTAVAIL;
665 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
666 b->sockaddr_size = result->ai_addrlen;
668 freeaddrinfo(result);
673 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
675 unsigned n_argv = 0, j;
677 size_t allocated = 0;
685 while (**p != 0 && **p != ';') {
686 r = parse_address_key(p, "guid", guid);
692 r = parse_address_key(p, "path", &path);
698 if (startswith(*p, "argv")) {
702 ul = strtoul(*p + 4, (char**) p, 10);
703 if (errno > 0 || **p != '=' || ul > 256) {
711 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
719 r = parse_address_key(p, NULL, argv + ul);
734 /* Make sure there are no holes in the array, with the
735 * exception of argv[0] */
736 for (j = 1; j < n_argv; j++)
742 if (argv && argv[0] == NULL) {
743 argv[0] = strdup(path);
755 for (j = 0; j < n_argv; j++)
763 static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
764 _cleanup_free_ char *path = NULL;
772 while (**p != 0 && **p != ';') {
773 r = parse_address_key(p, "guid", guid);
779 r = parse_address_key(p, "path", &path);
798 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
799 _cleanup_free_ char *machine = NULL, *pid = NULL;
807 while (**p != 0 && **p != ';') {
808 r = parse_address_key(p, "guid", guid);
814 r = parse_address_key(p, "machine", &machine);
820 r = parse_address_key(p, "pid", &pid);
829 if (!machine == !pid)
833 if (!machine_name_is_valid(machine))
837 b->machine = machine;
840 b->machine = mfree(b->machine);
844 r = parse_pid(pid, &b->nspid);
850 b->sockaddr.un.sun_family = AF_UNIX;
851 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
852 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
857 static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) {
858 _cleanup_free_ char *machine = NULL, *pid = NULL;
866 while (**p != 0 && **p != ';') {
867 r = parse_address_key(p, "guid", guid);
873 r = parse_address_key(p, "machine", &machine);
879 r = parse_address_key(p, "pid", &pid);
888 if (!machine == !pid)
892 if (!machine_name_is_valid(machine))
896 b->machine = machine;
899 b->machine = mfree(b->machine);
903 r = parse_pid(pid, &b->nspid);
909 r = free_and_strdup(&b->kernel, "/sys/fs/kdbus/0-system/bus");
916 static void bus_reset_parsed_address(sd_bus *b) {
920 b->sockaddr_size = 0;
921 b->exec_argv = strv_free(b->exec_argv);
922 b->exec_path = mfree(b->exec_path);
923 b->server_id = SD_ID128_NULL;
924 b->kernel = mfree(b->kernel);
925 b->machine = mfree(b->machine);
929 static int bus_parse_next_address(sd_bus *b) {
930 _cleanup_free_ char *guid = NULL;
938 if (b->address[b->address_index] == 0)
941 bus_reset_parsed_address(b);
943 a = b->address + b->address_index;
952 if (startswith(a, "unix:")) {
955 r = parse_unix_address(b, &a, &guid);
960 } else if (startswith(a, "tcp:")) {
963 r = parse_tcp_address(b, &a, &guid);
969 } else if (startswith(a, "unixexec:")) {
972 r = parse_exec_address(b, &a, &guid);
978 } else if (startswith(a, "kernel:")) {
981 r = parse_kernel_address(b, &a, &guid);
986 } else if (startswith(a, "x-machine-unix:")) {
989 r = parse_container_unix_address(b, &a, &guid);
994 } else if (startswith(a, "x-machine-kernel:")) {
997 r = parse_container_kernel_address(b, &a, &guid);
1010 r = sd_id128_from_string(guid, &b->server_id);
1015 b->address_index = a - b->address;
1019 static int bus_start_address(sd_bus *b) {
1020 bool container_kdbus_available = false;
1021 bool kdbus_available = false;
1027 bool skipped = false;
1032 * Usually, if you provide multiple different bus-addresses, we
1033 * try all of them in order. We use the first one that
1034 * succeeds. However, if you mix kernel and unix addresses, we
1035 * never try unix-addresses if a previous kernel address was
1036 * tried and kdbus was available. This is required to prevent
1037 * clients to fallback to the bus-proxy if kdbus is available
1038 * but failed (eg., too many connections).
1042 r = bus_socket_exec(b);
1043 else if ((b->nspid > 0 || b->machine) && b->kernel) {
1044 r = bus_container_connect_kernel(b);
1045 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1046 container_kdbus_available = true;
1048 } else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC) {
1049 if (!container_kdbus_available)
1050 r = bus_container_connect_socket(b);
1054 } else if (b->kernel) {
1055 r = bus_kernel_connect(b);
1056 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1057 kdbus_available = true;
1059 } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
1060 if (!kdbus_available)
1061 r = bus_socket_connect(b);
1069 r = attach_io_events(b);
1074 b->last_connect_error = -r;
1077 r = bus_parse_next_address(b);
1081 return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
1085 int bus_next_address(sd_bus *b) {
1088 bus_reset_parsed_address(b);
1089 return bus_start_address(b);
1092 static int bus_start_fd(sd_bus *b) {
1097 assert(b->input_fd >= 0);
1098 assert(b->output_fd >= 0);
1100 r = fd_nonblock(b->input_fd, true);
1104 r = fd_cloexec(b->input_fd, true);
1108 if (b->input_fd != b->output_fd) {
1109 r = fd_nonblock(b->output_fd, true);
1113 r = fd_cloexec(b->output_fd, true);
1118 if (fstat(b->input_fd, &st) < 0)
1121 if (S_ISCHR(b->input_fd))
1122 return bus_kernel_take_fd(b);
1124 return bus_socket_take_fd(b);
1127 _public_ int sd_bus_start(sd_bus *bus) {
1130 assert_return(bus, -EINVAL);
1131 assert_return(bus->state == BUS_UNSET, -EPERM);
1132 assert_return(!bus_pid_changed(bus), -ECHILD);
1134 bus->state = BUS_OPENING;
1136 if (bus->is_server && bus->bus_client)
1139 if (bus->input_fd >= 0)
1140 r = bus_start_fd(bus);
1141 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
1142 r = bus_start_address(bus);
1151 return bus_send_hello(bus);
1154 _public_ int sd_bus_open(sd_bus **ret) {
1159 assert_return(ret, -EINVAL);
1161 /* Let's connect to the starter bus if it is set, and
1162 * otherwise to the bus that is appropropriate for the scope
1163 * we are running in */
1165 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1167 if (streq(e, "system"))
1168 return sd_bus_open_system(ret);
1169 #if 0 /// elogind does not support systemd units
1170 else if (STR_IN_SET(e, "session", "user"))
1171 return sd_bus_open_user(ret);
1175 e = secure_getenv("DBUS_STARTER_ADDRESS");
1177 #if 0 /// elogind does not support systemd units
1178 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1179 return sd_bus_open_user(ret);
1182 return sd_bus_open_system(ret);
1189 r = sd_bus_set_address(b, e);
1193 b->bus_client = true;
1195 /* We don't know whether the bus is trusted or not, so better
1196 * be safe, and authenticate everything */
1198 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1199 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1201 r = sd_bus_start(b);
1213 int bus_set_address_system(sd_bus *b) {
1217 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1219 return sd_bus_set_address(b, e);
1221 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1224 _public_ int sd_bus_open_system(sd_bus **ret) {
1228 assert_return(ret, -EINVAL);
1234 r = bus_set_address_system(b);
1238 b->bus_client = true;
1239 b->is_system = true;
1241 /* Let's do per-method access control on the system bus. We
1242 * need the caller's UID and capability set for that. */
1244 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1245 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1247 r = sd_bus_start(b);
1259 #if 0 /// elogind can not open/use a user bus
1260 int bus_set_address_user(sd_bus *b) {
1267 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1269 return sd_bus_set_address(b, e);
1271 r = cg_pid_get_owner_uid(0, &uid);
1275 e = secure_getenv("XDG_RUNTIME_DIR");
1277 _cleanup_free_ char *ee = NULL;
1279 ee = bus_address_escape(e);
1283 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, ee);
1285 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, uid);
1294 _public_ int sd_bus_open_user(sd_bus **ret) {
1295 #if 0 /// elogind does not support user buses
1299 assert_return(ret, -EINVAL);
1305 r = bus_set_address_user(b);
1309 b->bus_client = true;
1312 /* We don't do any per-method access control on the user
1316 r = sd_bus_start(b);
1327 return sd_bus_open_system(ret);
1331 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1332 _cleanup_free_ char *e = NULL;
1333 char *m = NULL, *c = NULL;
1338 /* Let's see if we shall enter some container */
1339 m = strchr(host, ':');
1343 /* Let's make sure this is not a port of some kind,
1344 * and is a valid machine name. */
1345 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1348 /* Cut out the host part */
1349 t = strndupa(host, m - host - 1);
1350 e = bus_address_escape(t);
1354 c = strjoina(",argv4=--machine=", m);
1359 e = bus_address_escape(host);
1364 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", c);
1371 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1375 assert_return(host, -EINVAL);
1376 assert_return(ret, -EINVAL);
1378 r = sd_bus_new(&bus);
1382 r = bus_set_address_system_remote(bus, host);
1386 bus->bus_client = true;
1387 bus->trusted = false;
1388 bus->is_system = true;
1390 r = sd_bus_start(bus);
1402 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1403 _cleanup_free_ char *e = NULL;
1408 e = bus_address_escape(machine);
1412 b->address = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e);
1419 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1423 assert_return(machine, -EINVAL);
1424 assert_return(ret, -EINVAL);
1425 assert_return(machine_name_is_valid(machine), -EINVAL);
1427 r = sd_bus_new(&bus);
1431 r = bus_set_address_system_machine(bus, machine);
1435 bus->bus_client = true;
1436 bus->trusted = false;
1437 bus->is_system = true;
1439 r = sd_bus_start(bus);
1451 _public_ void sd_bus_close(sd_bus *bus) {
1455 if (bus->state == BUS_CLOSED)
1457 if (bus_pid_changed(bus))
1460 bus->state = BUS_CLOSED;
1462 sd_bus_detach_event(bus);
1464 /* Drop all queued messages so that they drop references to
1465 * the bus object and the bus may be freed */
1466 bus_reset_queues(bus);
1468 if (!bus->is_kernel)
1471 /* We'll leave the fd open in case this is a kernel bus, since
1472 * there might still be memblocks around that reference this
1473 * bus, and they might need to invoke the KDBUS_CMD_FREE
1474 * ioctl on the fd when they are freed. */
1477 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1485 return sd_bus_unref(bus);
1488 static void bus_enter_closing(sd_bus *bus) {
1491 if (bus->state != BUS_OPENING &&
1492 bus->state != BUS_AUTHENTICATING &&
1493 bus->state != BUS_HELLO &&
1494 bus->state != BUS_RUNNING)
1497 bus->state = BUS_CLOSING;
1500 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1505 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1510 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1516 i = REFCNT_DEC(bus->n_ref);
1524 #if 0 /// UNNEEDED by elogind
1525 _public_ int sd_bus_is_open(sd_bus *bus) {
1527 assert_return(bus, -EINVAL);
1528 assert_return(!bus_pid_changed(bus), -ECHILD);
1530 return BUS_IS_OPEN(bus->state);
1534 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1537 assert_return(bus, -EINVAL);
1538 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1539 assert_return(!bus_pid_changed(bus), -ECHILD);
1541 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1544 if (type == SD_BUS_TYPE_UNIX_FD) {
1545 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1548 r = bus_ensure_running(bus);
1552 return bus->can_fds;
1555 return bus_type_is_valid(type);
1558 #if 0 /// UNNEEDED by elogind
1559 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1562 assert_return(bus, -EINVAL);
1563 assert_return(id, -EINVAL);
1564 assert_return(!bus_pid_changed(bus), -ECHILD);
1566 r = bus_ensure_running(bus);
1570 *id = bus->server_id;
1575 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1580 /* If we copy the same message to multiple
1581 * destinations, avoid using the same cookie
1583 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1588 timeout = BUS_DEFAULT_TIMEOUT;
1590 return bus_message_seal(m, ++b->cookie, timeout);
1593 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1594 bool remarshal = false;
1598 /* wrong packet version */
1599 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1602 /* wrong packet endianness */
1603 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1606 /* TODO: kdbus-messages received from the kernel contain data which is
1607 * not allowed to be passed to KDBUS_CMD_SEND. Therefore, we have to
1608 * force remarshaling of the message. Technically, we could just
1609 * recreate the kdbus message, but that is non-trivial as other parts of
1610 * the message refer to m->kdbus already. This should be fixed! */
1611 if ((*m)->kdbus && (*m)->release_kdbus)
1614 return remarshal ? bus_message_remarshal(b, m) : 0;
1617 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1621 /* Fake some timestamps, if they were requested, and not
1622 * already initialized */
1623 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1624 if (m->realtime <= 0)
1625 m->realtime = now(CLOCK_REALTIME);
1627 if (m->monotonic <= 0)
1628 m->monotonic = now(CLOCK_MONOTONIC);
1631 /* The bus specification says the serial number cannot be 0,
1632 * hence let's fill something in for synthetic messages. Since
1633 * synthetic messages might have a fake sender and we don't
1634 * want to interfere with the real sender's serial numbers we
1635 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1636 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1637 * even though kdbus can do 64bit. */
1638 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1641 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1648 r = bus_kernel_write_message(bus, m, hint_sync_call);
1650 r = bus_socket_write_message(bus, m, idx);
1655 if (bus->is_kernel || *idx >= BUS_MESSAGE_SIZE(m))
1656 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s",
1657 bus_message_type_to_string(m->header->type),
1658 strna(sd_bus_message_get_sender(m)),
1659 strna(sd_bus_message_get_destination(m)),
1660 strna(sd_bus_message_get_path(m)),
1661 strna(sd_bus_message_get_interface(m)),
1662 strna(sd_bus_message_get_member(m)),
1663 BUS_MESSAGE_COOKIE(m),
1665 strna(m->error.message));
1670 static int dispatch_wqueue(sd_bus *bus) {
1674 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1676 while (bus->wqueue_size > 0) {
1678 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1682 /* Didn't do anything this time */
1684 else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1685 /* Fully written. Let's drop the entry from
1688 * This isn't particularly optimized, but
1689 * well, this is supposed to be our worst-case
1690 * buffer only, and the socket buffer is
1691 * supposed to be our primary buffer, and if
1692 * it got full, then all bets are off
1696 sd_bus_message_unref(bus->wqueue[0]);
1697 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1707 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1711 return bus_kernel_read_message(bus, hint_priority, priority);
1713 return bus_socket_read_message(bus);
1716 int bus_rqueue_make_room(sd_bus *bus) {
1719 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1722 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1728 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1733 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1735 /* Note that the priority logic is only available on kdbus,
1736 * where the rqueue is unused. We check the rqueue here
1737 * anyway, because it's simple... */
1740 if (bus->rqueue_size > 0) {
1741 /* Dispatch a queued message */
1743 *m = bus->rqueue[0];
1745 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1749 /* Try to read a new message */
1750 r = bus_read_message(bus, hint_priority, priority);
1760 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1761 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1764 assert_return(m, -EINVAL);
1769 assert_return(!bus_pid_changed(bus), -ECHILD);
1770 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1772 if (!BUS_IS_OPEN(bus->state))
1776 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1783 /* If the cookie number isn't kept, then we know that no reply
1785 if (!cookie && !m->sealed)
1786 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1788 r = bus_seal_message(bus, m, 0);
1792 /* Remarshall if we have to. This will possibly unref the
1793 * message and place a replacement in m */
1794 r = bus_remarshal_message(bus, &m);
1798 /* If this is a reply and no reply was requested, then let's
1799 * suppress this, if we can */
1803 if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
1806 r = bus_write_message(bus, m, hint_sync_call, &idx);
1808 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1809 bus_enter_closing(bus);
1816 if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) {
1817 /* Wasn't fully written. So let's remember how
1818 * much was written. Note that the first entry
1819 * of the wqueue array is always allocated so
1820 * that we always can remember how much was
1822 bus->wqueue[0] = sd_bus_message_ref(m);
1823 bus->wqueue_size = 1;
1828 /* Just append it to the queue. */
1830 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1833 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1836 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1841 *cookie = BUS_MESSAGE_COOKIE(m);
1846 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1847 return bus_send_internal(bus, m, cookie, false);
1850 #if 0 /// UNNEEDED by elogind
1851 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1854 assert_return(m, -EINVAL);
1859 assert_return(!bus_pid_changed(bus), -ECHILD);
1861 if (!BUS_IS_OPEN(bus->state))
1864 if (!streq_ptr(m->destination, destination)) {
1869 r = sd_bus_message_set_destination(m, destination);
1874 return sd_bus_send(bus, m, cookie);
1878 static usec_t calc_elapse(uint64_t usec) {
1879 if (usec == (uint64_t) -1)
1882 return now(CLOCK_MONOTONIC) + usec;
1885 static int timeout_compare(const void *a, const void *b) {
1886 const struct reply_callback *x = a, *y = b;
1888 if (x->timeout != 0 && y->timeout == 0)
1891 if (x->timeout == 0 && y->timeout != 0)
1894 if (x->timeout < y->timeout)
1897 if (x->timeout > y->timeout)
1903 _public_ int sd_bus_call_async(
1907 sd_bus_message_handler_t callback,
1911 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1912 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1915 assert_return(m, -EINVAL);
1916 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1917 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1918 assert_return(callback, -EINVAL);
1923 assert_return(!bus_pid_changed(bus), -ECHILD);
1924 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1926 if (!BUS_IS_OPEN(bus->state))
1929 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1933 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1937 r = bus_seal_message(bus, m, usec);
1941 r = bus_remarshal_message(bus, &m);
1945 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1949 s->reply_callback.callback = callback;
1951 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1952 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1954 s->reply_callback.cookie = 0;
1958 s->reply_callback.timeout = calc_elapse(m->timeout);
1959 if (s->reply_callback.timeout != 0) {
1960 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1962 s->reply_callback.timeout = 0;
1967 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1978 int bus_ensure_running(sd_bus *bus) {
1983 if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING)
1985 if (bus->state == BUS_RUNNING)
1989 r = sd_bus_process(bus, NULL);
1992 if (bus->state == BUS_RUNNING)
1997 r = sd_bus_wait(bus, (uint64_t) -1);
2003 _public_ int sd_bus_call(
2007 sd_bus_error *error,
2008 sd_bus_message **reply) {
2010 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2016 bus_assert_return(m, -EINVAL, error);
2017 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2018 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2019 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2024 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2025 bus_assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS, error);
2027 if (!BUS_IS_OPEN(bus->state)) {
2032 r = bus_ensure_running(bus);
2036 i = bus->rqueue_size;
2038 r = bus_seal_message(bus, m, usec);
2042 r = bus_remarshal_message(bus, &m);
2046 r = bus_send_internal(bus, m, &cookie, true);
2050 timeout = calc_elapse(m->timeout);
2055 while (i < bus->rqueue_size) {
2056 sd_bus_message *incoming = NULL;
2058 incoming = bus->rqueue[i];
2060 if (incoming->reply_cookie == cookie) {
2061 /* Found a match! */
2063 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2065 log_debug_bus_message(incoming);
2067 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2069 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2073 sd_bus_message_unref(incoming);
2078 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2079 sd_bus_message_unref(incoming);
2082 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2083 r = sd_bus_error_copy(error, &incoming->error);
2084 sd_bus_message_unref(incoming);
2091 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2094 streq(bus->unique_name, incoming->sender)) {
2096 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2099 /* Our own message? Somebody is trying
2100 * to send its own client a message,
2101 * let's not dead-lock, let's fail
2104 sd_bus_message_unref(incoming);
2109 /* Try to read more, right-away */
2113 r = bus_read_message(bus, false, 0);
2115 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2116 bus_enter_closing(bus);
2128 n = now(CLOCK_MONOTONIC);
2136 left = (uint64_t) -1;
2138 r = bus_poll(bus, true, left);
2146 r = dispatch_wqueue(bus);
2148 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2149 bus_enter_closing(bus);
2158 return sd_bus_error_set_errno(error, r);
2161 #if 0 /// UNNEEDED by elogind
2162 _public_ int sd_bus_get_fd(sd_bus *bus) {
2164 assert_return(bus, -EINVAL);
2165 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2166 assert_return(!bus_pid_changed(bus), -ECHILD);
2168 return bus->input_fd;
2172 _public_ int sd_bus_get_events(sd_bus *bus) {
2175 assert_return(bus, -EINVAL);
2176 assert_return(!bus_pid_changed(bus), -ECHILD);
2178 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2181 if (bus->state == BUS_OPENING)
2183 else if (bus->state == BUS_AUTHENTICATING) {
2185 if (bus_socket_auth_needs_write(bus))
2190 } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
2191 if (bus->rqueue_size <= 0)
2193 if (bus->wqueue_size > 0)
2200 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2201 struct reply_callback *c;
2203 assert_return(bus, -EINVAL);
2204 assert_return(timeout_usec, -EINVAL);
2205 assert_return(!bus_pid_changed(bus), -ECHILD);
2207 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2210 if (bus->track_queue) {
2215 if (bus->state == BUS_CLOSING) {
2220 if (bus->state == BUS_AUTHENTICATING) {
2221 *timeout_usec = bus->auth_timeout;
2225 if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) {
2226 *timeout_usec = (uint64_t) -1;
2230 if (bus->rqueue_size > 0) {
2235 c = prioq_peek(bus->reply_callbacks_prioq);
2237 *timeout_usec = (uint64_t) -1;
2241 if (c->timeout == 0) {
2242 *timeout_usec = (uint64_t) -1;
2246 *timeout_usec = c->timeout;
2250 static int process_timeout(sd_bus *bus) {
2251 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2252 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2253 struct reply_callback *c;
2260 c = prioq_peek(bus->reply_callbacks_prioq);
2264 n = now(CLOCK_MONOTONIC);
2268 r = bus_message_new_synthetic_error(
2271 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2276 r = bus_seal_synthetic_message(bus, m);
2280 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2283 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2286 slot = container_of(c, sd_bus_slot, reply_callback);
2288 bus->iteration_counter++;
2290 bus->current_message = m;
2291 bus->current_slot = sd_bus_slot_ref(slot);
2292 bus->current_handler = c->callback;
2293 bus->current_userdata = slot->userdata;
2294 r = c->callback(m, slot->userdata, &error_buffer);
2295 bus->current_userdata = NULL;
2296 bus->current_handler = NULL;
2297 bus->current_slot = NULL;
2298 bus->current_message = NULL;
2300 if (slot->floating) {
2301 bus_slot_disconnect(slot);
2302 sd_bus_slot_unref(slot);
2305 sd_bus_slot_unref(slot);
2307 return bus_maybe_reply_error(m, r, &error_buffer);
2310 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2314 if (bus->state != BUS_HELLO)
2317 /* Let's make sure the first message on the bus is the HELLO
2318 * reply. But note that we don't actually parse the message
2319 * here (we leave that to the usual handling), we just verify
2320 * we don't let any earlier msg through. */
2322 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2323 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2326 if (m->reply_cookie != 1)
2332 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2333 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2334 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2335 struct reply_callback *c;
2342 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2343 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2346 if (bus->is_kernel && (bus->hello_flags & KDBUS_HELLO_MONITOR))
2349 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2352 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2358 slot = container_of(c, sd_bus_slot, reply_callback);
2360 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2362 /* If the reply contained a file descriptor which we
2363 * didn't want we pass an error instead. */
2365 r = bus_message_new_synthetic_error(
2368 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2373 /* Copy over original timestamp */
2374 synthetic_reply->realtime = m->realtime;
2375 synthetic_reply->monotonic = m->monotonic;
2376 synthetic_reply->seqnum = m->seqnum;
2378 r = bus_seal_synthetic_message(bus, synthetic_reply);
2382 m = synthetic_reply;
2384 r = sd_bus_message_rewind(m, true);
2389 if (c->timeout != 0) {
2390 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2394 bus->current_slot = sd_bus_slot_ref(slot);
2395 bus->current_handler = c->callback;
2396 bus->current_userdata = slot->userdata;
2397 r = c->callback(m, slot->userdata, &error_buffer);
2398 bus->current_userdata = NULL;
2399 bus->current_handler = NULL;
2400 bus->current_slot = NULL;
2402 if (slot->floating) {
2403 bus_slot_disconnect(slot);
2404 sd_bus_slot_unref(slot);
2407 sd_bus_slot_unref(slot);
2409 return bus_maybe_reply_error(m, r, &error_buffer);
2412 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2413 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2414 struct filter_callback *l;
2421 bus->filter_callbacks_modified = false;
2423 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2426 if (bus->filter_callbacks_modified)
2429 /* Don't run this more than once per iteration */
2430 if (l->last_iteration == bus->iteration_counter)
2433 l->last_iteration = bus->iteration_counter;
2435 r = sd_bus_message_rewind(m, true);
2439 slot = container_of(l, sd_bus_slot, filter_callback);
2441 bus->current_slot = sd_bus_slot_ref(slot);
2442 bus->current_handler = l->callback;
2443 bus->current_userdata = slot->userdata;
2444 r = l->callback(m, slot->userdata, &error_buffer);
2445 bus->current_userdata = NULL;
2446 bus->current_handler = NULL;
2447 bus->current_slot = sd_bus_slot_unref(slot);
2449 r = bus_maybe_reply_error(m, r, &error_buffer);
2455 } while (bus->filter_callbacks_modified);
2460 static int process_match(sd_bus *bus, sd_bus_message *m) {
2467 bus->match_callbacks_modified = false;
2469 r = bus_match_run(bus, &bus->match_callbacks, m);
2473 } while (bus->match_callbacks_modified);
2478 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2479 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2485 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2488 if (bus->manual_peer_interface)
2491 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2494 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2497 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2500 if (streq_ptr(m->member, "Ping"))
2501 r = sd_bus_message_new_method_return(m, &reply);
2502 else if (streq_ptr(m->member, "GetMachineId")) {
2506 r = sd_id128_get_machine(&id);
2510 r = sd_bus_message_new_method_return(m, &reply);
2514 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2516 r = sd_bus_message_new_method_errorf(
2518 SD_BUS_ERROR_UNKNOWN_METHOD,
2519 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2525 r = sd_bus_send(bus, reply, NULL);
2532 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2536 /* If we got a message with a file descriptor which we didn't
2537 * want to accept, then let's drop it. How can this even
2538 * happen? For example, when the kernel queues a message into
2539 * an activatable names's queue which allows fds, and then is
2540 * delivered to us later even though we ourselves did not
2543 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2549 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2552 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2553 return 1; /* just eat it up */
2555 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2558 static int process_message(sd_bus *bus, sd_bus_message *m) {
2564 bus->current_message = m;
2565 bus->iteration_counter++;
2567 log_debug_bus_message(m);
2569 r = process_hello(bus, m);
2573 r = process_reply(bus, m);
2577 r = process_fd_check(bus, m);
2581 r = process_filter(bus, m);
2585 r = process_match(bus, m);
2589 r = process_builtin(bus, m);
2593 r = bus_process_object(bus, m);
2596 bus->current_message = NULL;
2600 static int dispatch_track(sd_bus *bus) {
2603 if (!bus->track_queue)
2606 bus_track_dispatch(bus->track_queue);
2610 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2611 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2615 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
2617 r = process_timeout(bus);
2621 r = dispatch_wqueue(bus);
2625 r = dispatch_track(bus);
2629 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2635 r = process_message(bus, m);
2640 r = sd_bus_message_rewind(m, true);
2649 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2651 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2652 strna(sd_bus_message_get_sender(m)),
2653 strna(sd_bus_message_get_path(m)),
2654 strna(sd_bus_message_get_interface(m)),
2655 strna(sd_bus_message_get_member(m)));
2657 r = sd_bus_reply_method_errorf(
2659 SD_BUS_ERROR_UNKNOWN_OBJECT,
2660 "Unknown object '%s'.", m->path);
2674 static int bus_exit_now(sd_bus *bus) {
2677 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2678 * sd_event_exit(), otherwise invokes libc exit(). */
2680 if (bus->exited) /* did we already exit? */
2682 if (!bus->exit_triggered) /* was the exit condition triggered? */
2684 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2687 bus->exited = true; /* never exit more than once */
2689 log_debug("Bus connection disconnected, exiting.");
2692 return sd_event_exit(bus->event, EXIT_FAILURE);
2696 assert_not_reached("exit() didn't exit?");
2699 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2700 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2701 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2708 r = bus_message_new_synthetic_error(
2711 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2716 r = bus_seal_synthetic_message(bus, m);
2720 if (c->timeout != 0) {
2721 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2725 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2728 slot = container_of(c, sd_bus_slot, reply_callback);
2730 bus->iteration_counter++;
2732 bus->current_message = m;
2733 bus->current_slot = sd_bus_slot_ref(slot);
2734 bus->current_handler = c->callback;
2735 bus->current_userdata = slot->userdata;
2736 r = c->callback(m, slot->userdata, &error_buffer);
2737 bus->current_userdata = NULL;
2738 bus->current_handler = NULL;
2739 bus->current_slot = NULL;
2740 bus->current_message = NULL;
2742 if (slot->floating) {
2743 bus_slot_disconnect(slot);
2744 sd_bus_slot_unref(slot);
2747 sd_bus_slot_unref(slot);
2749 return bus_maybe_reply_error(m, r, &error_buffer);
2752 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2753 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2754 struct reply_callback *c;
2758 assert(bus->state == BUS_CLOSING);
2760 /* First, fail all outstanding method calls */
2761 c = ordered_hashmap_first(bus->reply_callbacks);
2763 return process_closing_reply_callback(bus, c);
2765 /* Then, fake-drop all remaining bus tracking references */
2767 bus_track_close(bus->tracks);
2771 /* Then, synthesize a Disconnected message */
2772 r = sd_bus_message_new_signal(
2775 "/org/freedesktop/DBus/Local",
2776 "org.freedesktop.DBus.Local",
2781 bus_message_set_sender_local(bus, m);
2783 r = bus_seal_synthetic_message(bus, m);
2789 bus->current_message = m;
2790 bus->iteration_counter++;
2792 r = process_filter(bus, m);
2796 r = process_match(bus, m);
2800 /* Nothing else to do, exit now, if the condition holds */
2801 bus->exit_triggered = true;
2802 (void) bus_exit_now(bus);
2812 bus->current_message = NULL;
2817 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2818 BUS_DONT_DESTROY(bus);
2821 /* Returns 0 when we didn't do anything. This should cause the
2822 * caller to invoke sd_bus_wait() before returning the next
2823 * time. Returns > 0 when we did something, which possibly
2824 * means *ret is filled in with an unprocessed message. */
2826 assert_return(bus, -EINVAL);
2827 assert_return(!bus_pid_changed(bus), -ECHILD);
2829 /* We don't allow recursively invoking sd_bus_process(). */
2830 assert_return(!bus->current_message, -EBUSY);
2831 assert(!bus->current_slot);
2833 switch (bus->state) {
2842 r = bus_socket_process_opening(bus);
2843 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2844 bus_enter_closing(bus);
2852 case BUS_AUTHENTICATING:
2853 r = bus_socket_process_authenticating(bus);
2854 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2855 bus_enter_closing(bus);
2867 r = process_running(bus, hint_priority, priority, ret);
2868 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2869 bus_enter_closing(bus);
2879 return process_closing(bus, ret);
2882 assert_not_reached("Unknown state");
2885 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2886 return bus_process_internal(bus, false, 0, ret);
2889 #if 0 /// UNNEEDED by elogind
2890 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2891 return bus_process_internal(bus, true, priority, ret);
2895 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2896 struct pollfd p[2] = {};
2899 usec_t m = USEC_INFINITY;
2903 if (bus->state == BUS_CLOSING)
2906 if (!BUS_IS_OPEN(bus->state))
2909 e = sd_bus_get_events(bus);
2914 /* The caller really needs some more data, he doesn't
2915 * care about what's already read, or any timeouts
2916 * except its own. */
2920 /* The caller wants to process if there's something to
2921 * process, but doesn't care otherwise */
2923 r = sd_bus_get_timeout(bus, &until);
2928 nw = now(CLOCK_MONOTONIC);
2929 m = until > nw ? until - nw : 0;
2933 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2936 p[0].fd = bus->input_fd;
2937 if (bus->output_fd == bus->input_fd) {
2941 p[0].events = e & POLLIN;
2942 p[1].fd = bus->output_fd;
2943 p[1].events = e & POLLOUT;
2947 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2951 return r > 0 ? 1 : 0;
2954 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2956 assert_return(bus, -EINVAL);
2957 assert_return(!bus_pid_changed(bus), -ECHILD);
2959 if (bus->state == BUS_CLOSING)
2962 if (!BUS_IS_OPEN(bus->state))
2965 if (bus->rqueue_size > 0)
2968 return bus_poll(bus, false, timeout_usec);
2971 _public_ int sd_bus_flush(sd_bus *bus) {
2974 assert_return(bus, -EINVAL);
2975 assert_return(!bus_pid_changed(bus), -ECHILD);
2977 if (bus->state == BUS_CLOSING)
2980 if (!BUS_IS_OPEN(bus->state))
2983 r = bus_ensure_running(bus);
2987 if (bus->wqueue_size <= 0)
2991 r = dispatch_wqueue(bus);
2993 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2994 bus_enter_closing(bus);
3001 if (bus->wqueue_size <= 0)
3004 r = bus_poll(bus, false, (uint64_t) -1);
3010 #if 0 /// UNNEEDED by elogind
3011 _public_ int sd_bus_add_filter(
3014 sd_bus_message_handler_t callback,
3019 assert_return(bus, -EINVAL);
3020 assert_return(callback, -EINVAL);
3021 assert_return(!bus_pid_changed(bus), -ECHILD);
3023 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3027 s->filter_callback.callback = callback;
3029 bus->filter_callbacks_modified = true;
3030 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3039 _public_ int sd_bus_add_match(
3043 sd_bus_message_handler_t callback,
3046 struct bus_match_component *components = NULL;
3047 unsigned n_components = 0;
3048 sd_bus_slot *s = NULL;
3051 assert_return(bus, -EINVAL);
3052 assert_return(match, -EINVAL);
3053 assert_return(!bus_pid_changed(bus), -ECHILD);
3055 r = bus_match_parse(match, &components, &n_components);
3059 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3065 s->match_callback.callback = callback;
3066 s->match_callback.cookie = ++bus->match_cookie;
3068 if (bus->bus_client) {
3069 enum bus_match_scope scope;
3071 scope = bus_match_get_scope(components, n_components);
3073 /* Do not install server-side matches for matches
3074 * against the local service, interface or bus
3076 if (scope != BUS_MATCH_LOCAL) {
3078 if (!bus->is_kernel) {
3079 /* When this is not a kernel transport, we
3080 * store the original match string, so that we
3081 * can use it to remove the match again */
3083 s->match_callback.match_string = strdup(match);
3084 if (!s->match_callback.match_string) {
3090 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components, s->match_callback.cookie);
3094 s->match_added = true;
3098 bus->match_callbacks_modified = true;
3099 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3108 bus_match_parse_free(components, n_components);
3109 sd_bus_slot_unref(s);
3114 #if 0 /// UNNEEDED by elogind
3115 int bus_remove_match_by_string(
3118 sd_bus_message_handler_t callback,
3121 struct bus_match_component *components = NULL;
3122 unsigned n_components = 0;
3123 struct match_callback *c;
3126 assert_return(bus, -EINVAL);
3127 assert_return(match, -EINVAL);
3128 assert_return(!bus_pid_changed(bus), -ECHILD);
3130 r = bus_match_parse(match, &components, &n_components);
3134 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
3138 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
3141 bus_match_parse_free(components, n_components);
3147 bool bus_pid_changed(sd_bus *bus) {
3150 /* We don't support people creating a bus connection and
3151 * keeping it around over a fork(). Let's complain. */
3153 return bus->original_pid != getpid();
3156 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3157 sd_bus *bus = userdata;
3162 r = sd_bus_process(bus, NULL);
3169 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3170 sd_bus *bus = userdata;
3175 r = sd_bus_process(bus, NULL);
3182 static int prepare_callback(sd_event_source *s, void *userdata) {
3183 sd_bus *bus = userdata;
3190 e = sd_bus_get_events(bus);
3194 if (bus->output_fd != bus->input_fd) {
3196 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3200 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3204 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3209 r = sd_bus_get_timeout(bus, &until);
3215 j = sd_event_source_set_time(bus->time_event_source, until);
3220 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3227 static int quit_callback(sd_event_source *event, void *userdata) {
3228 sd_bus *bus = userdata;
3238 static int attach_io_events(sd_bus *bus) {
3243 if (bus->input_fd < 0)
3249 if (!bus->input_io_event_source) {
3250 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3254 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3258 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3262 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3264 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3269 if (bus->output_fd != bus->input_fd) {
3270 assert(bus->output_fd >= 0);
3272 if (!bus->output_io_event_source) {
3273 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3277 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3281 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3283 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3292 static void detach_io_events(sd_bus *bus) {
3295 if (bus->input_io_event_source) {
3296 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3297 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3300 if (bus->output_io_event_source) {
3301 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3302 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3306 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3309 assert_return(bus, -EINVAL);
3310 assert_return(!bus->event, -EBUSY);
3312 assert(!bus->input_io_event_source);
3313 assert(!bus->output_io_event_source);
3314 assert(!bus->time_event_source);
3317 bus->event = sd_event_ref(event);
3319 r = sd_event_default(&bus->event);
3324 bus->event_priority = priority;
3326 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3330 r = sd_event_source_set_priority(bus->time_event_source, priority);
3334 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3338 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3342 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3346 r = attach_io_events(bus);
3353 sd_bus_detach_event(bus);
3357 _public_ int sd_bus_detach_event(sd_bus *bus) {
3358 assert_return(bus, -EINVAL);
3363 detach_io_events(bus);
3365 if (bus->time_event_source) {
3366 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3367 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3370 if (bus->quit_event_source) {
3371 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3372 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3375 bus->event = sd_event_unref(bus->event);
3379 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3380 assert_return(bus, NULL);
3385 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3386 assert_return(bus, NULL);
3388 return bus->current_message;
3391 #if 0 /// UNNEEDED by elogind
3392 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3393 assert_return(bus, NULL);
3395 return bus->current_slot;
3399 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3400 assert_return(bus, NULL);
3402 return bus->current_handler;
3405 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3406 assert_return(bus, NULL);
3408 return bus->current_userdata;
3411 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3416 assert(default_bus);
3419 return !!*default_bus;
3422 *ret = sd_bus_ref(*default_bus);
3430 b->default_bus_ptr = default_bus;
3438 _public_ int sd_bus_default_system(sd_bus **ret) {
3439 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3443 _public_ int sd_bus_default_user(sd_bus **ret) {
3444 #if 0 /// elogind does not support user buses
3445 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3447 return sd_bus_default_system(ret);
3451 _public_ int sd_bus_default(sd_bus **ret) {
3455 /* Let's try our best to reuse another cached connection. If
3456 * the starter bus type is set, connect via our normal
3457 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3458 * we can share the connection with the user/system default
3461 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3463 if (streq(e, "system"))
3464 return sd_bus_default_system(ret);
3465 #if 0 /// elogind does not support systemd units
3466 else if (STR_IN_SET(e, "user", "session"))
3467 return sd_bus_default_user(ret);
3471 /* No type is specified, so we have not other option than to
3472 * use the starter address if it is set. */
3474 e = secure_getenv("DBUS_STARTER_ADDRESS");
3477 return bus_default(sd_bus_open, &default_starter_bus, ret);
3480 /* Finally, if nothing is set use the cached connection for
3481 * the right scope */
3483 #if 0 /// elogind does not support systemd units
3484 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3485 return sd_bus_default_user(ret);
3488 return sd_bus_default_system(ret);
3491 #if 0 /// UNNEEDED by elogind
3492 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3493 assert_return(b, -EINVAL);
3494 assert_return(tid, -EINVAL);
3495 assert_return(!bus_pid_changed(b), -ECHILD);
3503 return sd_event_get_tid(b->event, tid);
3508 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3509 _cleanup_free_ char *e = NULL;
3512 assert_return(object_path_is_valid(prefix), -EINVAL);
3513 assert_return(external_id, -EINVAL);
3514 assert_return(ret_path, -EINVAL);
3516 e = bus_label_escape(external_id);
3520 ret = strjoin(prefix, "/", e);
3528 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3532 assert_return(object_path_is_valid(path), -EINVAL);
3533 assert_return(object_path_is_valid(prefix), -EINVAL);
3534 assert_return(external_id, -EINVAL);
3536 e = object_path_startswith(path, prefix);
3538 *external_id = NULL;
3542 ret = bus_label_unescape(e);
3550 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3551 _cleanup_strv_free_ char **labels = NULL;
3552 char *path, *path_pos, **label_pos;
3553 const char *sep, *template_pos;
3558 assert_return(out, -EINVAL);
3559 assert_return(path_template, -EINVAL);
3561 path_length = strlen(path_template);
3563 va_start(list, path_template);
3564 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3568 arg = va_arg(list, const char *);
3574 label = bus_label_escape(arg);
3580 r = strv_consume(&labels, label);
3586 /* add label length, but account for the format character */
3587 path_length += strlen(label) - 1;
3591 path = malloc(path_length + 1);
3598 for (template_pos = path_template; *template_pos; ) {
3599 sep = strchrnul(template_pos, '%');
3600 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3604 path_pos = stpcpy(path_pos, *label_pos++);
3605 template_pos = sep + 1;
3613 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3614 _cleanup_strv_free_ char **labels = NULL;
3615 const char *template_pos, *path_pos;
3621 * This decodes an object-path based on a template argument. The
3622 * template consists of a verbatim path, optionally including special
3625 * - Each occurrence of '%' in the template matches an arbitrary
3626 * substring of a label in the given path. At most one such
3627 * directive is allowed per label. For each such directive, the
3628 * caller must provide an output parameter (char **) via va_arg. If
3629 * NULL is passed, the given label is verified, but not returned.
3630 * For each matched label, the *decoded* label is stored in the
3631 * passed output argument, and the caller is responsible to free
3632 * it. Note that the output arguments are only modified if the
3633 * actualy path matched the template. Otherwise, they're left
3636 * This function returns <0 on error, 0 if the path does not match the
3637 * template, 1 if it matched.
3640 assert_return(path, -EINVAL);
3641 assert_return(path_template, -EINVAL);
3645 for (template_pos = path_template; *template_pos; ) {
3650 /* verify everything until the next '%' matches verbatim */
3651 sep = strchrnul(template_pos, '%');
3652 length = sep - template_pos;
3653 if (strncmp(path_pos, template_pos, length))
3657 template_pos += length;
3662 /* We found the next '%' character. Everything up until here
3663 * matched. We now skip ahead to the end of this label and make
3664 * sure it matches the tail of the label in the path. Then we
3665 * decode the string in-between and save it for later use. */
3667 ++template_pos; /* skip over '%' */
3669 sep = strchrnul(template_pos, '/');
3670 length = sep - template_pos; /* length of suffix to match verbatim */
3672 /* verify the suffixes match */
3673 sep = strchrnul(path_pos, '/');
3674 if (sep - path_pos < (ssize_t)length ||
3675 strncmp(sep - length, template_pos, length))
3678 template_pos += length; /* skip over matched label */
3679 length = sep - path_pos - length; /* length of sub-label to decode */
3681 /* store unescaped label for later use */
3682 label = bus_label_unescape_n(path_pos, length);
3686 r = strv_consume(&labels, label);
3690 path_pos = sep; /* skip decoded label and suffix */
3693 /* end of template must match end of path */
3697 /* copy the labels over to the caller */
3698 va_start(list, path_template);
3699 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3702 arg = va_arg(list, char **);
3715 _public_ int sd_bus_try_close(sd_bus *bus) {
3718 assert_return(bus, -EINVAL);
3719 assert_return(!bus_pid_changed(bus), -ECHILD);
3721 if (!bus->is_kernel)
3724 if (!BUS_IS_OPEN(bus->state))
3727 if (bus->rqueue_size > 0)
3730 if (bus->wqueue_size > 0)
3733 r = bus_kernel_try_close(bus);
3741 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3742 assert_return(bus, -EINVAL);
3743 assert_return(description, -EINVAL);
3744 assert_return(bus->description, -ENXIO);
3745 assert_return(!bus_pid_changed(bus), -ECHILD);
3747 *description = bus->description;
3752 int bus_get_root_path(sd_bus *bus) {
3755 if (bus->cgroup_root)
3758 r = cg_get_root_path(&bus->cgroup_root);
3760 bus->cgroup_root = strdup("/");
3761 if (!bus->cgroup_root)
3770 #if 0 /// UNNEEDED by elogind
3771 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3774 assert_return(bus, -EINVAL);
3775 assert_return(scope, -EINVAL);
3776 assert_return(!bus_pid_changed(bus), -ECHILD);
3778 if (bus->is_kernel) {
3779 _cleanup_free_ char *n = NULL;
3782 r = bus_kernel_get_bus_name(bus, &n);
3786 if (streq(n, "0-system")) {
3791 dash = strchr(n, '-');
3792 if (streq_ptr(dash, "-user")) {
3803 if (bus->is_system) {
3811 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3813 assert_return(bus, -EINVAL);
3814 assert_return(address, -EINVAL);
3815 assert_return(!bus_pid_changed(bus), -ECHILD);
3818 *address = bus->address;
3825 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3826 assert_return(bus, -EINVAL);
3827 assert_return(mask, -EINVAL);
3828 assert_return(!bus_pid_changed(bus), -ECHILD);
3830 *mask = bus->creds_mask;
3834 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3835 assert_return(bus, -EINVAL);
3836 assert_return(!bus_pid_changed(bus), -ECHILD);
3838 return bus->bus_client;
3841 _public_ int sd_bus_is_server(sd_bus *bus) {
3842 assert_return(bus, -EINVAL);
3843 assert_return(!bus_pid_changed(bus), -ECHILD);
3845 return bus->is_server;
3848 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3849 assert_return(bus, -EINVAL);
3850 assert_return(!bus_pid_changed(bus), -ECHILD);
3852 return bus->anonymous_auth;
3855 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3856 assert_return(bus, -EINVAL);
3857 assert_return(!bus_pid_changed(bus), -ECHILD);
3859 return bus->trusted;
3862 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3863 assert_return(bus, -EINVAL);
3864 assert_return(!bus_pid_changed(bus), -ECHILD);
3866 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3869 static void flush_close(sd_bus *bus) {
3873 /* Flushes and closes the specified bus. We take a ref before,
3874 * to ensure the flushing does not cause the bus to be
3877 sd_bus_flush_close_unref(sd_bus_ref(bus));
3880 _public_ void sd_bus_default_flush_close(void) {
3881 flush_close(default_starter_bus);
3882 flush_close(default_user_bus);
3883 flush_close(default_system_bus);
3887 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
3888 assert_return(bus, -EINVAL);
3890 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
3891 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
3892 * from the client side. */
3893 bus->exit_on_disconnect = b;
3895 /* If the exit condition was triggered already, exit immediately. */
3896 return bus_exit_now(bus);
3899 #if 0 /// UNNEEDED by elogind
3900 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
3901 assert_return(bus, -EINVAL);
3903 return bus->exit_on_disconnect;