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;
608 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
609 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
611 struct addrinfo *result, hints = {
612 .ai_socktype = SOCK_STREAM,
613 .ai_flags = AI_ADDRCONFIG,
621 while (**p != 0 && **p != ';') {
622 r = parse_address_key(p, "guid", guid);
628 r = parse_address_key(p, "host", &host);
634 r = parse_address_key(p, "port", &port);
640 r = parse_address_key(p, "family", &family);
653 if (streq(family, "ipv4"))
654 hints.ai_family = AF_INET;
655 else if (streq(family, "ipv6"))
656 hints.ai_family = AF_INET6;
661 r = getaddrinfo(host, port, &hints, &result);
665 return -EADDRNOTAVAIL;
667 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
668 b->sockaddr_size = result->ai_addrlen;
670 freeaddrinfo(result);
677 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
679 unsigned n_argv = 0, j;
681 size_t allocated = 0;
689 while (**p != 0 && **p != ';') {
690 r = parse_address_key(p, "guid", guid);
696 r = parse_address_key(p, "path", &path);
702 if (startswith(*p, "argv")) {
706 ul = strtoul(*p + 4, (char**) p, 10);
707 if (errno > 0 || **p != '=' || ul > 256) {
715 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
723 r = parse_address_key(p, NULL, argv + ul);
738 /* Make sure there are no holes in the array, with the
739 * exception of argv[0] */
740 for (j = 1; j < n_argv; j++)
746 if (argv && argv[0] == NULL) {
747 argv[0] = strdup(path);
762 for (j = 0; j < n_argv; j++)
770 static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
771 _cleanup_free_ char *path = NULL;
779 while (**p != 0 && **p != ';') {
780 r = parse_address_key(p, "guid", guid);
786 r = parse_address_key(p, "path", &path);
807 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
808 _cleanup_free_ char *machine = NULL, *pid = NULL;
816 while (**p != 0 && **p != ';') {
817 r = parse_address_key(p, "guid", guid);
823 r = parse_address_key(p, "machine", &machine);
829 r = parse_address_key(p, "pid", &pid);
838 if (!machine == !pid)
842 if (!machine_name_is_valid(machine))
846 b->machine = machine;
849 b->machine = mfree(b->machine);
853 r = parse_pid(pid, &b->nspid);
859 b->sockaddr.un.sun_family = AF_UNIX;
860 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
861 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
867 static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) {
868 _cleanup_free_ char *machine = NULL, *pid = NULL;
876 while (**p != 0 && **p != ';') {
877 r = parse_address_key(p, "guid", guid);
883 r = parse_address_key(p, "machine", &machine);
889 r = parse_address_key(p, "pid", &pid);
898 if (!machine == !pid)
902 if (!machine_name_is_valid(machine))
906 b->machine = machine;
909 b->machine = mfree(b->machine);
913 r = parse_pid(pid, &b->nspid);
919 r = free_and_strdup(&b->kernel, "/sys/fs/kdbus/0-system/bus");
928 static void bus_reset_parsed_address(sd_bus *b) {
932 b->sockaddr_size = 0;
933 b->exec_argv = strv_free(b->exec_argv);
934 b->exec_path = mfree(b->exec_path);
935 b->server_id = SD_ID128_NULL;
936 b->kernel = mfree(b->kernel);
937 b->machine = mfree(b->machine);
941 static int bus_parse_next_address(sd_bus *b) {
942 _cleanup_free_ char *guid = NULL;
950 if (b->address[b->address_index] == 0)
953 bus_reset_parsed_address(b);
955 a = b->address + b->address_index;
964 if (startswith(a, "unix:")) {
967 r = parse_unix_address(b, &a, &guid);
972 } else if (startswith(a, "tcp:")) {
975 r = parse_tcp_address(b, &a, &guid);
981 } else if (startswith(a, "unixexec:")) {
984 r = parse_exec_address(b, &a, &guid);
990 } else if (startswith(a, "kernel:")) {
993 r = parse_kernel_address(b, &a, &guid);
998 } else if (startswith(a, "x-machine-unix:")) {
1001 r = parse_container_unix_address(b, &a, &guid);
1006 } else if (startswith(a, "x-machine-kernel:")) {
1009 r = parse_container_kernel_address(b, &a, &guid);
1022 r = sd_id128_from_string(guid, &b->server_id);
1027 b->address_index = a - b->address;
1031 static int bus_start_address(sd_bus *b) {
1032 bool container_kdbus_available = false;
1033 bool kdbus_available = false;
1039 bool skipped = false;
1044 * Usually, if you provide multiple different bus-addresses, we
1045 * try all of them in order. We use the first one that
1046 * succeeds. However, if you mix kernel and unix addresses, we
1047 * never try unix-addresses if a previous kernel address was
1048 * tried and kdbus was available. This is required to prevent
1049 * clients to fallback to the bus-proxy if kdbus is available
1050 * but failed (eg., too many connections).
1054 r = bus_socket_exec(b);
1055 else if ((b->nspid > 0 || b->machine) && b->kernel) {
1056 r = bus_container_connect_kernel(b);
1057 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1058 container_kdbus_available = true;
1060 } else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC) {
1061 if (!container_kdbus_available)
1062 r = bus_container_connect_socket(b);
1066 } else if (b->kernel) {
1067 r = bus_kernel_connect(b);
1068 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1069 kdbus_available = true;
1071 } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
1072 if (!kdbus_available)
1073 r = bus_socket_connect(b);
1081 r = attach_io_events(b);
1086 b->last_connect_error = -r;
1089 r = bus_parse_next_address(b);
1093 return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
1097 int bus_next_address(sd_bus *b) {
1100 bus_reset_parsed_address(b);
1101 return bus_start_address(b);
1104 static int bus_start_fd(sd_bus *b) {
1109 assert(b->input_fd >= 0);
1110 assert(b->output_fd >= 0);
1112 r = fd_nonblock(b->input_fd, true);
1116 r = fd_cloexec(b->input_fd, true);
1120 if (b->input_fd != b->output_fd) {
1121 r = fd_nonblock(b->output_fd, true);
1125 r = fd_cloexec(b->output_fd, true);
1130 if (fstat(b->input_fd, &st) < 0)
1133 if (S_ISCHR(b->input_fd))
1134 return bus_kernel_take_fd(b);
1136 return bus_socket_take_fd(b);
1139 _public_ int sd_bus_start(sd_bus *bus) {
1142 assert_return(bus, -EINVAL);
1143 assert_return(bus->state == BUS_UNSET, -EPERM);
1144 assert_return(!bus_pid_changed(bus), -ECHILD);
1146 bus->state = BUS_OPENING;
1148 if (bus->is_server && bus->bus_client)
1151 if (bus->input_fd >= 0)
1152 r = bus_start_fd(bus);
1153 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
1154 r = bus_start_address(bus);
1163 return bus_send_hello(bus);
1166 _public_ int sd_bus_open(sd_bus **ret) {
1171 assert_return(ret, -EINVAL);
1173 /* Let's connect to the starter bus if it is set, and
1174 * otherwise to the bus that is appropropriate for the scope
1175 * we are running in */
1177 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1179 if (streq(e, "system"))
1180 return sd_bus_open_system(ret);
1181 #if 0 /// elogind does not support systemd units
1182 else if (STR_IN_SET(e, "session", "user"))
1183 return sd_bus_open_user(ret);
1187 e = secure_getenv("DBUS_STARTER_ADDRESS");
1189 #if 0 /// elogind does not support systemd units
1190 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1191 return sd_bus_open_user(ret);
1194 return sd_bus_open_system(ret);
1201 r = sd_bus_set_address(b, e);
1205 b->bus_client = true;
1207 /* We don't know whether the bus is trusted or not, so better
1208 * be safe, and authenticate everything */
1210 b->is_local = false;
1211 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1212 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1214 r = sd_bus_start(b);
1226 int bus_set_address_system(sd_bus *b) {
1230 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1232 return sd_bus_set_address(b, e);
1234 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1237 _public_ int sd_bus_open_system(sd_bus **ret) {
1241 assert_return(ret, -EINVAL);
1247 r = bus_set_address_system(b);
1251 b->bus_client = true;
1252 b->is_system = true;
1254 /* Let's do per-method access control on the system bus. We
1255 * need the caller's UID and capability set for that. */
1257 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1258 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1261 r = sd_bus_start(b);
1273 #if 0 /// elogind can not open/use a user bus
1274 int bus_set_address_user(sd_bus *b) {
1281 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1283 return sd_bus_set_address(b, e);
1285 r = cg_pid_get_owner_uid(0, &uid);
1289 e = secure_getenv("XDG_RUNTIME_DIR");
1291 _cleanup_free_ char *ee = NULL;
1293 ee = bus_address_escape(e);
1297 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, ee);
1299 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, uid);
1308 _public_ int sd_bus_open_user(sd_bus **ret) {
1309 #if 0 /// elogind does not support user buses
1313 assert_return(ret, -EINVAL);
1319 r = bus_set_address_user(b);
1323 b->bus_client = true;
1326 /* We don't do any per-method access control on the user
1331 r = sd_bus_start(b);
1342 return sd_bus_open_system(ret);
1346 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1347 _cleanup_free_ char *e = NULL;
1348 char *m = NULL, *c = NULL;
1353 /* Let's see if we shall enter some container */
1354 m = strchr(host, ':');
1358 /* Let's make sure this is not a port of some kind,
1359 * and is a valid machine name. */
1360 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1363 /* Cut out the host part */
1364 t = strndupa(host, m - host - 1);
1365 e = bus_address_escape(t);
1369 c = strjoina(",argv4=--machine=", m);
1374 e = bus_address_escape(host);
1379 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", c);
1386 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1390 assert_return(host, -EINVAL);
1391 assert_return(ret, -EINVAL);
1393 r = sd_bus_new(&bus);
1397 r = bus_set_address_system_remote(bus, host);
1401 bus->bus_client = true;
1402 bus->trusted = false;
1403 bus->is_system = true;
1404 bus->is_local = false;
1406 r = sd_bus_start(bus);
1418 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1419 _cleanup_free_ char *e = NULL;
1424 e = bus_address_escape(machine);
1428 b->address = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e);
1435 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1439 assert_return(machine, -EINVAL);
1440 assert_return(ret, -EINVAL);
1441 assert_return(machine_name_is_valid(machine), -EINVAL);
1443 r = sd_bus_new(&bus);
1447 r = bus_set_address_system_machine(bus, machine);
1451 bus->bus_client = true;
1452 bus->trusted = false;
1453 bus->is_system = true;
1454 bus->is_local = false;
1456 r = sd_bus_start(bus);
1468 _public_ void sd_bus_close(sd_bus *bus) {
1472 if (bus->state == BUS_CLOSED)
1474 if (bus_pid_changed(bus))
1477 bus->state = BUS_CLOSED;
1479 sd_bus_detach_event(bus);
1481 /* Drop all queued messages so that they drop references to
1482 * the bus object and the bus may be freed */
1483 bus_reset_queues(bus);
1485 if (!bus->is_kernel)
1488 /* We'll leave the fd open in case this is a kernel bus, since
1489 * there might still be memblocks around that reference this
1490 * bus, and they might need to invoke the KDBUS_CMD_FREE
1491 * ioctl on the fd when they are freed. */
1494 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1502 return sd_bus_unref(bus);
1505 static void bus_enter_closing(sd_bus *bus) {
1508 if (bus->state != BUS_OPENING &&
1509 bus->state != BUS_AUTHENTICATING &&
1510 bus->state != BUS_HELLO &&
1511 bus->state != BUS_RUNNING)
1514 bus->state = BUS_CLOSING;
1517 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1522 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1527 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1533 i = REFCNT_DEC(bus->n_ref);
1541 #if 0 /// UNNEEDED by elogind
1542 _public_ int sd_bus_is_open(sd_bus *bus) {
1544 assert_return(bus, -EINVAL);
1545 assert_return(!bus_pid_changed(bus), -ECHILD);
1547 return BUS_IS_OPEN(bus->state);
1551 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1554 assert_return(bus, -EINVAL);
1555 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1556 assert_return(!bus_pid_changed(bus), -ECHILD);
1558 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1561 if (type == SD_BUS_TYPE_UNIX_FD) {
1562 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1565 r = bus_ensure_running(bus);
1569 return bus->can_fds;
1572 return bus_type_is_valid(type);
1575 #if 0 /// UNNEEDED by elogind
1576 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1579 assert_return(bus, -EINVAL);
1580 assert_return(id, -EINVAL);
1581 assert_return(!bus_pid_changed(bus), -ECHILD);
1583 r = bus_ensure_running(bus);
1587 *id = bus->server_id;
1592 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1597 /* If we copy the same message to multiple
1598 * destinations, avoid using the same cookie
1600 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1605 timeout = BUS_DEFAULT_TIMEOUT;
1607 return bus_message_seal(m, ++b->cookie, timeout);
1610 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1611 bool remarshal = false;
1615 /* wrong packet version */
1616 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1619 /* wrong packet endianness */
1620 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1623 /* TODO: kdbus-messages received from the kernel contain data which is
1624 * not allowed to be passed to KDBUS_CMD_SEND. Therefore, we have to
1625 * force remarshaling of the message. Technically, we could just
1626 * recreate the kdbus message, but that is non-trivial as other parts of
1627 * the message refer to m->kdbus already. This should be fixed! */
1628 if ((*m)->kdbus && (*m)->release_kdbus)
1631 return remarshal ? bus_message_remarshal(b, m) : 0;
1634 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1638 /* Fake some timestamps, if they were requested, and not
1639 * already initialized */
1640 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1641 if (m->realtime <= 0)
1642 m->realtime = now(CLOCK_REALTIME);
1644 if (m->monotonic <= 0)
1645 m->monotonic = now(CLOCK_MONOTONIC);
1648 /* The bus specification says the serial number cannot be 0,
1649 * hence let's fill something in for synthetic messages. Since
1650 * synthetic messages might have a fake sender and we don't
1651 * want to interfere with the real sender's serial numbers we
1652 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1653 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1654 * even though kdbus can do 64bit. */
1655 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1658 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1665 r = bus_kernel_write_message(bus, m, hint_sync_call);
1667 r = bus_socket_write_message(bus, m, idx);
1672 if (bus->is_kernel || *idx >= BUS_MESSAGE_SIZE(m))
1673 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s",
1674 bus_message_type_to_string(m->header->type),
1675 strna(sd_bus_message_get_sender(m)),
1676 strna(sd_bus_message_get_destination(m)),
1677 strna(sd_bus_message_get_path(m)),
1678 strna(sd_bus_message_get_interface(m)),
1679 strna(sd_bus_message_get_member(m)),
1680 BUS_MESSAGE_COOKIE(m),
1682 strna(m->error.message));
1687 static int dispatch_wqueue(sd_bus *bus) {
1691 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1693 while (bus->wqueue_size > 0) {
1695 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1699 /* Didn't do anything this time */
1701 else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1702 /* Fully written. Let's drop the entry from
1705 * This isn't particularly optimized, but
1706 * well, this is supposed to be our worst-case
1707 * buffer only, and the socket buffer is
1708 * supposed to be our primary buffer, and if
1709 * it got full, then all bets are off
1713 sd_bus_message_unref(bus->wqueue[0]);
1714 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1724 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1728 return bus_kernel_read_message(bus, hint_priority, priority);
1730 return bus_socket_read_message(bus);
1733 int bus_rqueue_make_room(sd_bus *bus) {
1736 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1739 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1745 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1750 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1752 /* Note that the priority logic is only available on kdbus,
1753 * where the rqueue is unused. We check the rqueue here
1754 * anyway, because it's simple... */
1757 if (bus->rqueue_size > 0) {
1758 /* Dispatch a queued message */
1760 *m = bus->rqueue[0];
1762 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1766 /* Try to read a new message */
1767 r = bus_read_message(bus, hint_priority, priority);
1777 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1778 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1781 assert_return(m, -EINVAL);
1786 assert_return(!bus_pid_changed(bus), -ECHILD);
1787 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1789 if (!BUS_IS_OPEN(bus->state))
1793 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1800 /* If the cookie number isn't kept, then we know that no reply
1802 if (!cookie && !m->sealed)
1803 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1805 r = bus_seal_message(bus, m, 0);
1809 /* Remarshall if we have to. This will possibly unref the
1810 * message and place a replacement in m */
1811 r = bus_remarshal_message(bus, &m);
1815 /* If this is a reply and no reply was requested, then let's
1816 * suppress this, if we can */
1820 if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
1823 r = bus_write_message(bus, m, hint_sync_call, &idx);
1825 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1826 bus_enter_closing(bus);
1833 if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) {
1834 /* Wasn't fully written. So let's remember how
1835 * much was written. Note that the first entry
1836 * of the wqueue array is always allocated so
1837 * that we always can remember how much was
1839 bus->wqueue[0] = sd_bus_message_ref(m);
1840 bus->wqueue_size = 1;
1845 /* Just append it to the queue. */
1847 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1850 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1853 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1858 *cookie = BUS_MESSAGE_COOKIE(m);
1863 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1864 return bus_send_internal(bus, m, cookie, false);
1867 #if 0 /// UNNEEDED by elogind
1868 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1871 assert_return(m, -EINVAL);
1876 assert_return(!bus_pid_changed(bus), -ECHILD);
1878 if (!BUS_IS_OPEN(bus->state))
1881 if (!streq_ptr(m->destination, destination)) {
1886 r = sd_bus_message_set_destination(m, destination);
1891 return sd_bus_send(bus, m, cookie);
1895 static usec_t calc_elapse(uint64_t usec) {
1896 if (usec == (uint64_t) -1)
1899 return now(CLOCK_MONOTONIC) + usec;
1902 static int timeout_compare(const void *a, const void *b) {
1903 const struct reply_callback *x = a, *y = b;
1905 if (x->timeout != 0 && y->timeout == 0)
1908 if (x->timeout == 0 && y->timeout != 0)
1911 if (x->timeout < y->timeout)
1914 if (x->timeout > y->timeout)
1920 _public_ int sd_bus_call_async(
1924 sd_bus_message_handler_t callback,
1928 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1929 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1932 assert_return(m, -EINVAL);
1933 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1934 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1935 assert_return(callback, -EINVAL);
1940 assert_return(!bus_pid_changed(bus), -ECHILD);
1941 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1943 if (!BUS_IS_OPEN(bus->state))
1946 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1950 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1954 r = bus_seal_message(bus, m, usec);
1958 r = bus_remarshal_message(bus, &m);
1962 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1966 s->reply_callback.callback = callback;
1968 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1969 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1971 s->reply_callback.cookie = 0;
1975 s->reply_callback.timeout = calc_elapse(m->timeout);
1976 if (s->reply_callback.timeout != 0) {
1977 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1979 s->reply_callback.timeout = 0;
1984 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1995 int bus_ensure_running(sd_bus *bus) {
2000 if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING)
2002 if (bus->state == BUS_RUNNING)
2006 r = sd_bus_process(bus, NULL);
2009 if (bus->state == BUS_RUNNING)
2014 r = sd_bus_wait(bus, (uint64_t) -1);
2020 _public_ int sd_bus_call(
2024 sd_bus_error *error,
2025 sd_bus_message **reply) {
2027 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2033 bus_assert_return(m, -EINVAL, error);
2034 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2035 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2036 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2041 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2042 bus_assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS, error);
2044 if (!BUS_IS_OPEN(bus->state)) {
2049 r = bus_ensure_running(bus);
2053 i = bus->rqueue_size;
2055 r = bus_seal_message(bus, m, usec);
2059 r = bus_remarshal_message(bus, &m);
2063 r = bus_send_internal(bus, m, &cookie, true);
2067 timeout = calc_elapse(m->timeout);
2072 while (i < bus->rqueue_size) {
2073 sd_bus_message *incoming = NULL;
2075 incoming = bus->rqueue[i];
2077 if (incoming->reply_cookie == cookie) {
2078 /* Found a match! */
2080 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2082 log_debug_bus_message(incoming);
2084 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2086 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2090 sd_bus_message_unref(incoming);
2095 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2096 sd_bus_message_unref(incoming);
2099 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2100 r = sd_bus_error_copy(error, &incoming->error);
2101 sd_bus_message_unref(incoming);
2108 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2111 streq(bus->unique_name, incoming->sender)) {
2113 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2116 /* Our own message? Somebody is trying
2117 * to send its own client a message,
2118 * let's not dead-lock, let's fail
2121 sd_bus_message_unref(incoming);
2126 /* Try to read more, right-away */
2130 r = bus_read_message(bus, false, 0);
2132 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2133 bus_enter_closing(bus);
2145 n = now(CLOCK_MONOTONIC);
2153 left = (uint64_t) -1;
2155 r = bus_poll(bus, true, left);
2163 r = dispatch_wqueue(bus);
2165 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2166 bus_enter_closing(bus);
2175 return sd_bus_error_set_errno(error, r);
2178 #if 0 /// UNNEEDED by elogind
2179 _public_ int sd_bus_get_fd(sd_bus *bus) {
2181 assert_return(bus, -EINVAL);
2182 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2183 assert_return(!bus_pid_changed(bus), -ECHILD);
2185 return bus->input_fd;
2189 _public_ int sd_bus_get_events(sd_bus *bus) {
2192 assert_return(bus, -EINVAL);
2193 assert_return(!bus_pid_changed(bus), -ECHILD);
2195 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2198 if (bus->state == BUS_OPENING)
2200 else if (bus->state == BUS_AUTHENTICATING) {
2202 if (bus_socket_auth_needs_write(bus))
2207 } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
2208 if (bus->rqueue_size <= 0)
2210 if (bus->wqueue_size > 0)
2217 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2218 struct reply_callback *c;
2220 assert_return(bus, -EINVAL);
2221 assert_return(timeout_usec, -EINVAL);
2222 assert_return(!bus_pid_changed(bus), -ECHILD);
2224 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2227 if (bus->track_queue) {
2232 if (bus->state == BUS_CLOSING) {
2237 if (bus->state == BUS_AUTHENTICATING) {
2238 *timeout_usec = bus->auth_timeout;
2242 if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) {
2243 *timeout_usec = (uint64_t) -1;
2247 if (bus->rqueue_size > 0) {
2252 c = prioq_peek(bus->reply_callbacks_prioq);
2254 *timeout_usec = (uint64_t) -1;
2258 if (c->timeout == 0) {
2259 *timeout_usec = (uint64_t) -1;
2263 *timeout_usec = c->timeout;
2267 static int process_timeout(sd_bus *bus) {
2268 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2269 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2270 struct reply_callback *c;
2277 c = prioq_peek(bus->reply_callbacks_prioq);
2281 n = now(CLOCK_MONOTONIC);
2285 r = bus_message_new_synthetic_error(
2288 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2293 r = bus_seal_synthetic_message(bus, m);
2297 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2300 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2303 slot = container_of(c, sd_bus_slot, reply_callback);
2305 bus->iteration_counter++;
2307 bus->current_message = m;
2308 bus->current_slot = sd_bus_slot_ref(slot);
2309 bus->current_handler = c->callback;
2310 bus->current_userdata = slot->userdata;
2311 r = c->callback(m, slot->userdata, &error_buffer);
2312 bus->current_userdata = NULL;
2313 bus->current_handler = NULL;
2314 bus->current_slot = NULL;
2315 bus->current_message = NULL;
2317 if (slot->floating) {
2318 bus_slot_disconnect(slot);
2319 sd_bus_slot_unref(slot);
2322 sd_bus_slot_unref(slot);
2324 return bus_maybe_reply_error(m, r, &error_buffer);
2327 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2331 if (bus->state != BUS_HELLO)
2334 /* Let's make sure the first message on the bus is the HELLO
2335 * reply. But note that we don't actually parse the message
2336 * here (we leave that to the usual handling), we just verify
2337 * we don't let any earlier msg through. */
2339 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2340 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2343 if (m->reply_cookie != 1)
2349 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2350 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2351 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2352 struct reply_callback *c;
2359 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2360 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2363 if (bus->is_kernel && (bus->hello_flags & KDBUS_HELLO_MONITOR))
2366 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2369 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2375 slot = container_of(c, sd_bus_slot, reply_callback);
2377 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2379 /* If the reply contained a file descriptor which we
2380 * didn't want we pass an error instead. */
2382 r = bus_message_new_synthetic_error(
2385 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2390 /* Copy over original timestamp */
2391 synthetic_reply->realtime = m->realtime;
2392 synthetic_reply->monotonic = m->monotonic;
2393 synthetic_reply->seqnum = m->seqnum;
2395 r = bus_seal_synthetic_message(bus, synthetic_reply);
2399 m = synthetic_reply;
2401 r = sd_bus_message_rewind(m, true);
2406 if (c->timeout != 0) {
2407 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2411 bus->current_slot = sd_bus_slot_ref(slot);
2412 bus->current_handler = c->callback;
2413 bus->current_userdata = slot->userdata;
2414 r = c->callback(m, slot->userdata, &error_buffer);
2415 bus->current_userdata = NULL;
2416 bus->current_handler = NULL;
2417 bus->current_slot = NULL;
2419 if (slot->floating) {
2420 bus_slot_disconnect(slot);
2421 sd_bus_slot_unref(slot);
2424 sd_bus_slot_unref(slot);
2426 return bus_maybe_reply_error(m, r, &error_buffer);
2429 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2430 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2431 struct filter_callback *l;
2438 bus->filter_callbacks_modified = false;
2440 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2443 if (bus->filter_callbacks_modified)
2446 /* Don't run this more than once per iteration */
2447 if (l->last_iteration == bus->iteration_counter)
2450 l->last_iteration = bus->iteration_counter;
2452 r = sd_bus_message_rewind(m, true);
2456 slot = container_of(l, sd_bus_slot, filter_callback);
2458 bus->current_slot = sd_bus_slot_ref(slot);
2459 bus->current_handler = l->callback;
2460 bus->current_userdata = slot->userdata;
2461 r = l->callback(m, slot->userdata, &error_buffer);
2462 bus->current_userdata = NULL;
2463 bus->current_handler = NULL;
2464 bus->current_slot = sd_bus_slot_unref(slot);
2466 r = bus_maybe_reply_error(m, r, &error_buffer);
2472 } while (bus->filter_callbacks_modified);
2477 static int process_match(sd_bus *bus, sd_bus_message *m) {
2484 bus->match_callbacks_modified = false;
2486 r = bus_match_run(bus, &bus->match_callbacks, m);
2490 } while (bus->match_callbacks_modified);
2495 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2496 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2502 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2505 if (bus->manual_peer_interface)
2508 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2511 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2514 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2517 if (streq_ptr(m->member, "Ping"))
2518 r = sd_bus_message_new_method_return(m, &reply);
2519 else if (streq_ptr(m->member, "GetMachineId")) {
2523 r = sd_id128_get_machine(&id);
2527 r = sd_bus_message_new_method_return(m, &reply);
2531 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2533 r = sd_bus_message_new_method_errorf(
2535 SD_BUS_ERROR_UNKNOWN_METHOD,
2536 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2542 r = sd_bus_send(bus, reply, NULL);
2549 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2553 /* If we got a message with a file descriptor which we didn't
2554 * want to accept, then let's drop it. How can this even
2555 * happen? For example, when the kernel queues a message into
2556 * an activatable names's queue which allows fds, and then is
2557 * delivered to us later even though we ourselves did not
2560 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2566 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2569 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2570 return 1; /* just eat it up */
2572 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2575 static int process_message(sd_bus *bus, sd_bus_message *m) {
2581 bus->current_message = m;
2582 bus->iteration_counter++;
2584 log_debug_bus_message(m);
2586 r = process_hello(bus, m);
2590 r = process_reply(bus, m);
2594 r = process_fd_check(bus, m);
2598 r = process_filter(bus, m);
2602 r = process_match(bus, m);
2606 r = process_builtin(bus, m);
2610 r = bus_process_object(bus, m);
2613 bus->current_message = NULL;
2617 static int dispatch_track(sd_bus *bus) {
2620 if (!bus->track_queue)
2623 bus_track_dispatch(bus->track_queue);
2627 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2628 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2632 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
2634 r = process_timeout(bus);
2638 r = dispatch_wqueue(bus);
2642 r = dispatch_track(bus);
2646 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2652 r = process_message(bus, m);
2657 r = sd_bus_message_rewind(m, true);
2666 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2668 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2669 strna(sd_bus_message_get_sender(m)),
2670 strna(sd_bus_message_get_path(m)),
2671 strna(sd_bus_message_get_interface(m)),
2672 strna(sd_bus_message_get_member(m)));
2674 r = sd_bus_reply_method_errorf(
2676 SD_BUS_ERROR_UNKNOWN_OBJECT,
2677 "Unknown object '%s'.", m->path);
2691 static int bus_exit_now(sd_bus *bus) {
2694 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2695 * sd_event_exit(), otherwise invokes libc exit(). */
2697 if (bus->exited) /* did we already exit? */
2699 if (!bus->exit_triggered) /* was the exit condition triggered? */
2701 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2704 bus->exited = true; /* never exit more than once */
2706 log_debug("Bus connection disconnected, exiting.");
2709 return sd_event_exit(bus->event, EXIT_FAILURE);
2713 assert_not_reached("exit() didn't exit?");
2716 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2717 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2718 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2725 r = bus_message_new_synthetic_error(
2728 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2733 r = bus_seal_synthetic_message(bus, m);
2737 if (c->timeout != 0) {
2738 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2742 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2745 slot = container_of(c, sd_bus_slot, reply_callback);
2747 bus->iteration_counter++;
2749 bus->current_message = m;
2750 bus->current_slot = sd_bus_slot_ref(slot);
2751 bus->current_handler = c->callback;
2752 bus->current_userdata = slot->userdata;
2753 r = c->callback(m, slot->userdata, &error_buffer);
2754 bus->current_userdata = NULL;
2755 bus->current_handler = NULL;
2756 bus->current_slot = NULL;
2757 bus->current_message = NULL;
2759 if (slot->floating) {
2760 bus_slot_disconnect(slot);
2761 sd_bus_slot_unref(slot);
2764 sd_bus_slot_unref(slot);
2766 return bus_maybe_reply_error(m, r, &error_buffer);
2769 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2770 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2771 struct reply_callback *c;
2775 assert(bus->state == BUS_CLOSING);
2777 /* First, fail all outstanding method calls */
2778 c = ordered_hashmap_first(bus->reply_callbacks);
2780 return process_closing_reply_callback(bus, c);
2782 /* Then, fake-drop all remaining bus tracking references */
2784 bus_track_close(bus->tracks);
2788 /* Then, synthesize a Disconnected message */
2789 r = sd_bus_message_new_signal(
2792 "/org/freedesktop/DBus/Local",
2793 "org.freedesktop.DBus.Local",
2798 bus_message_set_sender_local(bus, m);
2800 r = bus_seal_synthetic_message(bus, m);
2806 bus->current_message = m;
2807 bus->iteration_counter++;
2809 r = process_filter(bus, m);
2813 r = process_match(bus, m);
2817 /* Nothing else to do, exit now, if the condition holds */
2818 bus->exit_triggered = true;
2819 (void) bus_exit_now(bus);
2829 bus->current_message = NULL;
2834 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2835 BUS_DONT_DESTROY(bus);
2838 /* Returns 0 when we didn't do anything. This should cause the
2839 * caller to invoke sd_bus_wait() before returning the next
2840 * time. Returns > 0 when we did something, which possibly
2841 * means *ret is filled in with an unprocessed message. */
2843 assert_return(bus, -EINVAL);
2844 assert_return(!bus_pid_changed(bus), -ECHILD);
2846 /* We don't allow recursively invoking sd_bus_process(). */
2847 assert_return(!bus->current_message, -EBUSY);
2848 assert(!bus->current_slot);
2850 switch (bus->state) {
2859 r = bus_socket_process_opening(bus);
2860 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2861 bus_enter_closing(bus);
2869 case BUS_AUTHENTICATING:
2870 r = bus_socket_process_authenticating(bus);
2871 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2872 bus_enter_closing(bus);
2884 r = process_running(bus, hint_priority, priority, ret);
2885 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2886 bus_enter_closing(bus);
2896 return process_closing(bus, ret);
2899 assert_not_reached("Unknown state");
2902 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2903 return bus_process_internal(bus, false, 0, ret);
2906 #if 0 /// UNNEEDED by elogind
2907 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2908 return bus_process_internal(bus, true, priority, ret);
2912 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2913 struct pollfd p[2] = {};
2916 usec_t m = USEC_INFINITY;
2920 if (bus->state == BUS_CLOSING)
2923 if (!BUS_IS_OPEN(bus->state))
2926 e = sd_bus_get_events(bus);
2931 /* The caller really needs some more data, he doesn't
2932 * care about what's already read, or any timeouts
2933 * except its own. */
2937 /* The caller wants to process if there's something to
2938 * process, but doesn't care otherwise */
2940 r = sd_bus_get_timeout(bus, &until);
2945 nw = now(CLOCK_MONOTONIC);
2946 m = until > nw ? until - nw : 0;
2950 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2953 p[0].fd = bus->input_fd;
2954 if (bus->output_fd == bus->input_fd) {
2958 p[0].events = e & POLLIN;
2959 p[1].fd = bus->output_fd;
2960 p[1].events = e & POLLOUT;
2964 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2968 return r > 0 ? 1 : 0;
2971 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2973 assert_return(bus, -EINVAL);
2974 assert_return(!bus_pid_changed(bus), -ECHILD);
2976 if (bus->state == BUS_CLOSING)
2979 if (!BUS_IS_OPEN(bus->state))
2982 if (bus->rqueue_size > 0)
2985 return bus_poll(bus, false, timeout_usec);
2988 _public_ int sd_bus_flush(sd_bus *bus) {
2991 assert_return(bus, -EINVAL);
2992 assert_return(!bus_pid_changed(bus), -ECHILD);
2994 if (bus->state == BUS_CLOSING)
2997 if (!BUS_IS_OPEN(bus->state))
3000 r = bus_ensure_running(bus);
3004 if (bus->wqueue_size <= 0)
3008 r = dispatch_wqueue(bus);
3010 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3011 bus_enter_closing(bus);
3018 if (bus->wqueue_size <= 0)
3021 r = bus_poll(bus, false, (uint64_t) -1);
3027 #if 0 /// UNNEEDED by elogind
3028 _public_ int sd_bus_add_filter(
3031 sd_bus_message_handler_t callback,
3036 assert_return(bus, -EINVAL);
3037 assert_return(callback, -EINVAL);
3038 assert_return(!bus_pid_changed(bus), -ECHILD);
3040 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3044 s->filter_callback.callback = callback;
3046 bus->filter_callbacks_modified = true;
3047 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3056 _public_ int sd_bus_add_match(
3060 sd_bus_message_handler_t callback,
3063 struct bus_match_component *components = NULL;
3064 unsigned n_components = 0;
3065 sd_bus_slot *s = NULL;
3068 assert_return(bus, -EINVAL);
3069 assert_return(match, -EINVAL);
3070 assert_return(!bus_pid_changed(bus), -ECHILD);
3072 r = bus_match_parse(match, &components, &n_components);
3076 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3082 s->match_callback.callback = callback;
3083 s->match_callback.cookie = ++bus->match_cookie;
3085 if (bus->bus_client) {
3086 enum bus_match_scope scope;
3088 scope = bus_match_get_scope(components, n_components);
3090 /* Do not install server-side matches for matches
3091 * against the local service, interface or bus
3093 if (scope != BUS_MATCH_LOCAL) {
3095 if (!bus->is_kernel) {
3096 /* When this is not a kernel transport, we
3097 * store the original match string, so that we
3098 * can use it to remove the match again */
3100 s->match_callback.match_string = strdup(match);
3101 if (!s->match_callback.match_string) {
3107 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components, s->match_callback.cookie);
3111 s->match_added = true;
3115 bus->match_callbacks_modified = true;
3116 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3125 bus_match_parse_free(components, n_components);
3126 sd_bus_slot_unref(s);
3131 #if 0 /// UNNEEDED by elogind
3132 int bus_remove_match_by_string(
3135 sd_bus_message_handler_t callback,
3138 struct bus_match_component *components = NULL;
3139 unsigned n_components = 0;
3140 struct match_callback *c;
3143 assert_return(bus, -EINVAL);
3144 assert_return(match, -EINVAL);
3145 assert_return(!bus_pid_changed(bus), -ECHILD);
3147 r = bus_match_parse(match, &components, &n_components);
3151 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
3155 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
3158 bus_match_parse_free(components, n_components);
3164 bool bus_pid_changed(sd_bus *bus) {
3167 /* We don't support people creating a bus connection and
3168 * keeping it around over a fork(). Let's complain. */
3170 return bus->original_pid != getpid();
3173 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3174 sd_bus *bus = userdata;
3179 r = sd_bus_process(bus, NULL);
3186 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3187 sd_bus *bus = userdata;
3192 r = sd_bus_process(bus, NULL);
3199 static int prepare_callback(sd_event_source *s, void *userdata) {
3200 sd_bus *bus = userdata;
3207 e = sd_bus_get_events(bus);
3211 if (bus->output_fd != bus->input_fd) {
3213 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3217 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3221 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3226 r = sd_bus_get_timeout(bus, &until);
3232 j = sd_event_source_set_time(bus->time_event_source, until);
3237 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3244 static int quit_callback(sd_event_source *event, void *userdata) {
3245 sd_bus *bus = userdata;
3255 static int attach_io_events(sd_bus *bus) {
3260 if (bus->input_fd < 0)
3266 if (!bus->input_io_event_source) {
3267 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3271 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3275 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3279 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3281 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3286 if (bus->output_fd != bus->input_fd) {
3287 assert(bus->output_fd >= 0);
3289 if (!bus->output_io_event_source) {
3290 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3294 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3298 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3300 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3309 static void detach_io_events(sd_bus *bus) {
3312 if (bus->input_io_event_source) {
3313 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3314 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3317 if (bus->output_io_event_source) {
3318 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3319 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3323 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3326 assert_return(bus, -EINVAL);
3327 assert_return(!bus->event, -EBUSY);
3329 assert(!bus->input_io_event_source);
3330 assert(!bus->output_io_event_source);
3331 assert(!bus->time_event_source);
3334 bus->event = sd_event_ref(event);
3336 r = sd_event_default(&bus->event);
3341 bus->event_priority = priority;
3343 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3347 r = sd_event_source_set_priority(bus->time_event_source, priority);
3351 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3355 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3359 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3363 r = attach_io_events(bus);
3370 sd_bus_detach_event(bus);
3374 _public_ int sd_bus_detach_event(sd_bus *bus) {
3375 assert_return(bus, -EINVAL);
3380 detach_io_events(bus);
3382 if (bus->time_event_source) {
3383 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3384 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3387 if (bus->quit_event_source) {
3388 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3389 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3392 bus->event = sd_event_unref(bus->event);
3396 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3397 assert_return(bus, NULL);
3402 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3403 assert_return(bus, NULL);
3405 return bus->current_message;
3408 #if 0 /// UNNEEDED by elogind
3409 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3410 assert_return(bus, NULL);
3412 return bus->current_slot;
3416 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3417 assert_return(bus, NULL);
3419 return bus->current_handler;
3422 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3423 assert_return(bus, NULL);
3425 return bus->current_userdata;
3428 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3433 assert(default_bus);
3436 return !!*default_bus;
3439 *ret = sd_bus_ref(*default_bus);
3447 b->default_bus_ptr = default_bus;
3455 _public_ int sd_bus_default_system(sd_bus **ret) {
3456 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3460 _public_ int sd_bus_default_user(sd_bus **ret) {
3461 #if 0 /// elogind does not support user buses
3462 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3464 return sd_bus_default_system(ret);
3468 _public_ int sd_bus_default(sd_bus **ret) {
3472 /* Let's try our best to reuse another cached connection. If
3473 * the starter bus type is set, connect via our normal
3474 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3475 * we can share the connection with the user/system default
3478 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3480 if (streq(e, "system"))
3481 return sd_bus_default_system(ret);
3482 #if 0 /// elogind does not support systemd units
3483 else if (STR_IN_SET(e, "user", "session"))
3484 return sd_bus_default_user(ret);
3488 /* No type is specified, so we have not other option than to
3489 * use the starter address if it is set. */
3491 e = secure_getenv("DBUS_STARTER_ADDRESS");
3494 return bus_default(sd_bus_open, &default_starter_bus, ret);
3497 /* Finally, if nothing is set use the cached connection for
3498 * the right scope */
3500 #if 0 /// elogind does not support systemd units
3501 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3502 return sd_bus_default_user(ret);
3505 return sd_bus_default_system(ret);
3508 #if 0 /// UNNEEDED by elogind
3509 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3510 assert_return(b, -EINVAL);
3511 assert_return(tid, -EINVAL);
3512 assert_return(!bus_pid_changed(b), -ECHILD);
3520 return sd_event_get_tid(b->event, tid);
3525 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3526 _cleanup_free_ char *e = NULL;
3529 assert_return(object_path_is_valid(prefix), -EINVAL);
3530 assert_return(external_id, -EINVAL);
3531 assert_return(ret_path, -EINVAL);
3533 e = bus_label_escape(external_id);
3537 ret = strjoin(prefix, "/", e);
3545 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3549 assert_return(object_path_is_valid(path), -EINVAL);
3550 assert_return(object_path_is_valid(prefix), -EINVAL);
3551 assert_return(external_id, -EINVAL);
3553 e = object_path_startswith(path, prefix);
3555 *external_id = NULL;
3559 ret = bus_label_unescape(e);
3567 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3568 _cleanup_strv_free_ char **labels = NULL;
3569 char *path, *path_pos, **label_pos;
3570 const char *sep, *template_pos;
3575 assert_return(out, -EINVAL);
3576 assert_return(path_template, -EINVAL);
3578 path_length = strlen(path_template);
3580 va_start(list, path_template);
3581 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3585 arg = va_arg(list, const char *);
3591 label = bus_label_escape(arg);
3597 r = strv_consume(&labels, label);
3603 /* add label length, but account for the format character */
3604 path_length += strlen(label) - 1;
3608 path = malloc(path_length + 1);
3615 for (template_pos = path_template; *template_pos; ) {
3616 sep = strchrnul(template_pos, '%');
3617 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3621 path_pos = stpcpy(path_pos, *label_pos++);
3622 template_pos = sep + 1;
3630 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3631 _cleanup_strv_free_ char **labels = NULL;
3632 const char *template_pos, *path_pos;
3638 * This decodes an object-path based on a template argument. The
3639 * template consists of a verbatim path, optionally including special
3642 * - Each occurrence of '%' in the template matches an arbitrary
3643 * substring of a label in the given path. At most one such
3644 * directive is allowed per label. For each such directive, the
3645 * caller must provide an output parameter (char **) via va_arg. If
3646 * NULL is passed, the given label is verified, but not returned.
3647 * For each matched label, the *decoded* label is stored in the
3648 * passed output argument, and the caller is responsible to free
3649 * it. Note that the output arguments are only modified if the
3650 * actualy path matched the template. Otherwise, they're left
3653 * This function returns <0 on error, 0 if the path does not match the
3654 * template, 1 if it matched.
3657 assert_return(path, -EINVAL);
3658 assert_return(path_template, -EINVAL);
3662 for (template_pos = path_template; *template_pos; ) {
3667 /* verify everything until the next '%' matches verbatim */
3668 sep = strchrnul(template_pos, '%');
3669 length = sep - template_pos;
3670 if (strncmp(path_pos, template_pos, length))
3674 template_pos += length;
3679 /* We found the next '%' character. Everything up until here
3680 * matched. We now skip ahead to the end of this label and make
3681 * sure it matches the tail of the label in the path. Then we
3682 * decode the string in-between and save it for later use. */
3684 ++template_pos; /* skip over '%' */
3686 sep = strchrnul(template_pos, '/');
3687 length = sep - template_pos; /* length of suffix to match verbatim */
3689 /* verify the suffixes match */
3690 sep = strchrnul(path_pos, '/');
3691 if (sep - path_pos < (ssize_t)length ||
3692 strncmp(sep - length, template_pos, length))
3695 template_pos += length; /* skip over matched label */
3696 length = sep - path_pos - length; /* length of sub-label to decode */
3698 /* store unescaped label for later use */
3699 label = bus_label_unescape_n(path_pos, length);
3703 r = strv_consume(&labels, label);
3707 path_pos = sep; /* skip decoded label and suffix */
3710 /* end of template must match end of path */
3714 /* copy the labels over to the caller */
3715 va_start(list, path_template);
3716 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3719 arg = va_arg(list, char **);
3732 _public_ int sd_bus_try_close(sd_bus *bus) {
3735 assert_return(bus, -EINVAL);
3736 assert_return(!bus_pid_changed(bus), -ECHILD);
3738 if (!bus->is_kernel)
3741 if (!BUS_IS_OPEN(bus->state))
3744 if (bus->rqueue_size > 0)
3747 if (bus->wqueue_size > 0)
3750 r = bus_kernel_try_close(bus);
3758 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3759 assert_return(bus, -EINVAL);
3760 assert_return(description, -EINVAL);
3761 assert_return(bus->description, -ENXIO);
3762 assert_return(!bus_pid_changed(bus), -ECHILD);
3764 *description = bus->description;
3769 int bus_get_root_path(sd_bus *bus) {
3772 if (bus->cgroup_root)
3775 r = cg_get_root_path(&bus->cgroup_root);
3777 bus->cgroup_root = strdup("/");
3778 if (!bus->cgroup_root)
3787 #if 0 /// UNNEEDED by elogind
3788 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3791 assert_return(bus, -EINVAL);
3792 assert_return(scope, -EINVAL);
3793 assert_return(!bus_pid_changed(bus), -ECHILD);
3795 if (bus->is_kernel) {
3796 _cleanup_free_ char *n = NULL;
3799 r = bus_kernel_get_bus_name(bus, &n);
3803 if (streq(n, "0-system")) {
3808 dash = strchr(n, '-');
3809 if (streq_ptr(dash, "-user")) {
3820 if (bus->is_system) {
3828 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3830 assert_return(bus, -EINVAL);
3831 assert_return(address, -EINVAL);
3832 assert_return(!bus_pid_changed(bus), -ECHILD);
3835 *address = bus->address;
3842 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3843 assert_return(bus, -EINVAL);
3844 assert_return(mask, -EINVAL);
3845 assert_return(!bus_pid_changed(bus), -ECHILD);
3847 *mask = bus->creds_mask;
3851 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3852 assert_return(bus, -EINVAL);
3853 assert_return(!bus_pid_changed(bus), -ECHILD);
3855 return bus->bus_client;
3858 _public_ int sd_bus_is_server(sd_bus *bus) {
3859 assert_return(bus, -EINVAL);
3860 assert_return(!bus_pid_changed(bus), -ECHILD);
3862 return bus->is_server;
3865 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3866 assert_return(bus, -EINVAL);
3867 assert_return(!bus_pid_changed(bus), -ECHILD);
3869 return bus->anonymous_auth;
3872 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3873 assert_return(bus, -EINVAL);
3874 assert_return(!bus_pid_changed(bus), -ECHILD);
3876 return bus->trusted;
3879 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3880 assert_return(bus, -EINVAL);
3881 assert_return(!bus_pid_changed(bus), -ECHILD);
3883 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3886 static void flush_close(sd_bus *bus) {
3890 /* Flushes and closes the specified bus. We take a ref before,
3891 * to ensure the flushing does not cause the bus to be
3894 sd_bus_flush_close_unref(sd_bus_ref(bus));
3897 _public_ void sd_bus_default_flush_close(void) {
3898 flush_close(default_starter_bus);
3899 flush_close(default_user_bus);
3900 flush_close(default_system_bus);
3904 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
3905 assert_return(bus, -EINVAL);
3907 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
3908 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
3909 * from the client side. */
3910 bus->exit_on_disconnect = b;
3912 /* If the exit condition was triggered already, exit immediately. */
3913 return bus_exit_now(bus);
3916 #if 0 /// UNNEEDED by elogind
3917 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
3918 assert_return(bus, -EINVAL);
3920 return bus->exit_on_disconnect;