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);
266 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
267 assert_return(bus, -EINVAL);
268 assert_return(bus->state == BUS_UNSET, -EPERM);
269 assert_return(!bus_pid_changed(bus), -ECHILD);
271 bus->bus_client = !!b;
275 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
276 assert_return(bus, -EINVAL);
277 assert_return(bus->state == BUS_UNSET, -EPERM);
278 assert_return(!bus_pid_changed(bus), -ECHILD);
280 SET_FLAG(bus->hello_flags, KDBUS_HELLO_MONITOR, b);
284 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
285 assert_return(bus, -EINVAL);
286 assert_return(bus->state == BUS_UNSET, -EPERM);
287 assert_return(!bus_pid_changed(bus), -ECHILD);
289 SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b);
293 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
295 assert_return(bus, -EINVAL);
296 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
297 assert_return(!bus_pid_changed(bus), -ECHILD);
299 new_flags = bus->attach_flags;
300 SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b);
302 if (bus->attach_flags == new_flags)
305 bus->attach_flags = new_flags;
306 if (bus->state != BUS_UNSET && bus->is_kernel)
307 bus_kernel_realize_attach_flags(bus);
312 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
315 assert_return(bus, -EINVAL);
316 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
317 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
318 assert_return(!bus_pid_changed(bus), -ECHILD);
320 SET_FLAG(bus->creds_mask, mask, b);
322 /* The well knowns we need unconditionally, so that matches can work */
323 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
325 /* Make sure we don't lose the timestamp flag */
326 new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask);
327 if (bus->attach_flags == new_flags)
330 bus->attach_flags = new_flags;
331 if (bus->state != BUS_UNSET && bus->is_kernel)
332 bus_kernel_realize_attach_flags(bus);
337 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
338 assert_return(bus, -EINVAL);
339 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
340 assert_return(bus->state == BUS_UNSET, -EPERM);
341 assert_return(!bus_pid_changed(bus), -ECHILD);
343 bus->is_server = !!b;
344 bus->server_id = server_id;
348 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
349 assert_return(bus, -EINVAL);
350 assert_return(bus->state == BUS_UNSET, -EPERM);
351 assert_return(!bus_pid_changed(bus), -ECHILD);
353 bus->anonymous_auth = !!b;
357 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
358 assert_return(bus, -EINVAL);
359 assert_return(bus->state == BUS_UNSET, -EPERM);
360 assert_return(!bus_pid_changed(bus), -ECHILD);
366 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
367 assert_return(bus, -EINVAL);
368 assert_return(bus->state == BUS_UNSET, -EPERM);
369 assert_return(!bus_pid_changed(bus), -ECHILD);
371 return free_and_strdup(&bus->description, description);
375 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
376 assert_return(bus, -EINVAL);
377 assert_return(!bus_pid_changed(bus), -ECHILD);
379 bus->allow_interactive_authorization = !!b;
383 #if 0 /// UNNEEDED by elogind
384 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
385 assert_return(bus, -EINVAL);
386 assert_return(!bus_pid_changed(bus), -ECHILD);
388 return bus->allow_interactive_authorization;
392 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
400 assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING);
402 r = sd_bus_message_get_errno(reply);
406 r = sd_bus_message_read(reply, "s", &s);
410 if (!service_name_is_valid(s) || s[0] != ':')
413 bus->unique_name = strdup(s);
414 if (!bus->unique_name)
417 if (bus->state == BUS_HELLO)
418 bus->state = BUS_RUNNING;
423 static int bus_send_hello(sd_bus *bus) {
424 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
429 if (!bus->bus_client || bus->is_kernel)
432 r = sd_bus_message_new_method_call(
435 "org.freedesktop.DBus",
436 "/org/freedesktop/DBus",
437 "org.freedesktop.DBus",
442 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
445 int bus_start_running(sd_bus *bus) {
448 if (bus->bus_client && !bus->is_kernel) {
449 bus->state = BUS_HELLO;
453 bus->state = BUS_RUNNING;
457 static int parse_address_key(const char **p, const char *key, char **value) {
458 size_t l, n = 0, allocated = 0;
468 if (strncmp(*p, key, l) != 0)
481 while (*a != ';' && *a != ',' && *a != 0) {
499 c = (char) ((x << 4) | y);
506 if (!GREEDY_REALLOC(r, allocated, n + 2))
530 static void skip_address_key(const char **p) {
534 *p += strcspn(*p, ",");
540 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
541 _cleanup_free_ char *path = NULL, *abstract = NULL;
550 while (**p != 0 && **p != ';') {
551 r = parse_address_key(p, "guid", guid);
557 r = parse_address_key(p, "path", &path);
563 r = parse_address_key(p, "abstract", &abstract);
572 if (!path && !abstract)
575 if (path && abstract)
580 if (l > sizeof(b->sockaddr.un.sun_path))
583 b->sockaddr.un.sun_family = AF_UNIX;
584 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
585 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
586 } else if (abstract) {
587 l = strlen(abstract);
588 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
591 b->sockaddr.un.sun_family = AF_UNIX;
592 b->sockaddr.un.sun_path[0] = 0;
593 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
594 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
600 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
601 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
603 struct addrinfo *result, hints = {
604 .ai_socktype = SOCK_STREAM,
605 .ai_flags = AI_ADDRCONFIG,
613 while (**p != 0 && **p != ';') {
614 r = parse_address_key(p, "guid", guid);
620 r = parse_address_key(p, "host", &host);
626 r = parse_address_key(p, "port", &port);
632 r = parse_address_key(p, "family", &family);
645 if (streq(family, "ipv4"))
646 hints.ai_family = AF_INET;
647 else if (streq(family, "ipv6"))
648 hints.ai_family = AF_INET6;
653 r = getaddrinfo(host, port, &hints, &result);
657 return -EADDRNOTAVAIL;
659 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
660 b->sockaddr_size = result->ai_addrlen;
662 freeaddrinfo(result);
667 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
669 unsigned n_argv = 0, j;
671 size_t allocated = 0;
679 while (**p != 0 && **p != ';') {
680 r = parse_address_key(p, "guid", guid);
686 r = parse_address_key(p, "path", &path);
692 if (startswith(*p, "argv")) {
696 ul = strtoul(*p + 4, (char**) p, 10);
697 if (errno > 0 || **p != '=' || ul > 256) {
705 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
713 r = parse_address_key(p, NULL, argv + ul);
728 /* Make sure there are no holes in the array, with the
729 * exception of argv[0] */
730 for (j = 1; j < n_argv; j++)
736 if (argv && argv[0] == NULL) {
737 argv[0] = strdup(path);
749 for (j = 0; j < n_argv; j++)
757 static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
758 _cleanup_free_ char *path = NULL;
766 while (**p != 0 && **p != ';') {
767 r = parse_address_key(p, "guid", guid);
773 r = parse_address_key(p, "path", &path);
792 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
793 _cleanup_free_ char *machine = NULL, *pid = NULL;
801 while (**p != 0 && **p != ';') {
802 r = parse_address_key(p, "guid", guid);
808 r = parse_address_key(p, "machine", &machine);
814 r = parse_address_key(p, "pid", &pid);
823 if (!machine == !pid)
827 if (!machine_name_is_valid(machine))
831 b->machine = machine;
834 b->machine = mfree(b->machine);
838 r = parse_pid(pid, &b->nspid);
844 b->sockaddr.un.sun_family = AF_UNIX;
845 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
846 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
851 static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) {
852 _cleanup_free_ char *machine = NULL, *pid = NULL;
860 while (**p != 0 && **p != ';') {
861 r = parse_address_key(p, "guid", guid);
867 r = parse_address_key(p, "machine", &machine);
873 r = parse_address_key(p, "pid", &pid);
882 if (!machine == !pid)
886 if (!machine_name_is_valid(machine))
890 b->machine = machine;
893 b->machine = mfree(b->machine);
897 r = parse_pid(pid, &b->nspid);
903 r = free_and_strdup(&b->kernel, "/sys/fs/kdbus/0-system/bus");
910 static void bus_reset_parsed_address(sd_bus *b) {
914 b->sockaddr_size = 0;
915 b->exec_argv = strv_free(b->exec_argv);
916 b->exec_path = mfree(b->exec_path);
917 b->server_id = SD_ID128_NULL;
918 b->kernel = mfree(b->kernel);
919 b->machine = mfree(b->machine);
923 static int bus_parse_next_address(sd_bus *b) {
924 _cleanup_free_ char *guid = NULL;
932 if (b->address[b->address_index] == 0)
935 bus_reset_parsed_address(b);
937 a = b->address + b->address_index;
946 if (startswith(a, "unix:")) {
949 r = parse_unix_address(b, &a, &guid);
954 } else if (startswith(a, "tcp:")) {
957 r = parse_tcp_address(b, &a, &guid);
963 } else if (startswith(a, "unixexec:")) {
966 r = parse_exec_address(b, &a, &guid);
972 } else if (startswith(a, "kernel:")) {
975 r = parse_kernel_address(b, &a, &guid);
980 } else if (startswith(a, "x-machine-unix:")) {
983 r = parse_container_unix_address(b, &a, &guid);
988 } else if (startswith(a, "x-machine-kernel:")) {
991 r = parse_container_kernel_address(b, &a, &guid);
1004 r = sd_id128_from_string(guid, &b->server_id);
1009 b->address_index = a - b->address;
1013 static int bus_start_address(sd_bus *b) {
1014 bool container_kdbus_available = false;
1015 bool kdbus_available = false;
1021 bool skipped = false;
1026 * Usually, if you provide multiple different bus-addresses, we
1027 * try all of them in order. We use the first one that
1028 * succeeds. However, if you mix kernel and unix addresses, we
1029 * never try unix-addresses if a previous kernel address was
1030 * tried and kdbus was available. This is required to prevent
1031 * clients to fallback to the bus-proxy if kdbus is available
1032 * but failed (eg., too many connections).
1036 r = bus_socket_exec(b);
1037 else if ((b->nspid > 0 || b->machine) && b->kernel) {
1038 r = bus_container_connect_kernel(b);
1039 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1040 container_kdbus_available = true;
1042 } else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC) {
1043 if (!container_kdbus_available)
1044 r = bus_container_connect_socket(b);
1048 } else if (b->kernel) {
1049 r = bus_kernel_connect(b);
1050 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1051 kdbus_available = true;
1053 } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
1054 if (!kdbus_available)
1055 r = bus_socket_connect(b);
1063 r = attach_io_events(b);
1068 b->last_connect_error = -r;
1071 r = bus_parse_next_address(b);
1075 return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
1079 int bus_next_address(sd_bus *b) {
1082 bus_reset_parsed_address(b);
1083 return bus_start_address(b);
1086 static int bus_start_fd(sd_bus *b) {
1091 assert(b->input_fd >= 0);
1092 assert(b->output_fd >= 0);
1094 r = fd_nonblock(b->input_fd, true);
1098 r = fd_cloexec(b->input_fd, true);
1102 if (b->input_fd != b->output_fd) {
1103 r = fd_nonblock(b->output_fd, true);
1107 r = fd_cloexec(b->output_fd, true);
1112 if (fstat(b->input_fd, &st) < 0)
1115 if (S_ISCHR(b->input_fd))
1116 return bus_kernel_take_fd(b);
1118 return bus_socket_take_fd(b);
1121 _public_ int sd_bus_start(sd_bus *bus) {
1124 assert_return(bus, -EINVAL);
1125 assert_return(bus->state == BUS_UNSET, -EPERM);
1126 assert_return(!bus_pid_changed(bus), -ECHILD);
1128 bus->state = BUS_OPENING;
1130 if (bus->is_server && bus->bus_client)
1133 if (bus->input_fd >= 0)
1134 r = bus_start_fd(bus);
1135 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
1136 r = bus_start_address(bus);
1145 return bus_send_hello(bus);
1148 _public_ int sd_bus_open(sd_bus **ret) {
1153 assert_return(ret, -EINVAL);
1155 /* Let's connect to the starter bus if it is set, and
1156 * otherwise to the bus that is appropropriate for the scope
1157 * we are running in */
1159 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1161 if (streq(e, "system"))
1162 return sd_bus_open_system(ret);
1163 #if 0 /// elogind does not support systemd units
1164 else if (STR_IN_SET(e, "session", "user"))
1165 return sd_bus_open_user(ret);
1169 e = secure_getenv("DBUS_STARTER_ADDRESS");
1171 #if 0 /// elogind does not support systemd units
1172 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1173 return sd_bus_open_user(ret);
1176 return sd_bus_open_system(ret);
1183 r = sd_bus_set_address(b, e);
1187 b->bus_client = true;
1189 /* We don't know whether the bus is trusted or not, so better
1190 * be safe, and authenticate everything */
1192 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1193 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1195 r = sd_bus_start(b);
1207 int bus_set_address_system(sd_bus *b) {
1211 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1213 return sd_bus_set_address(b, e);
1215 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1218 _public_ int sd_bus_open_system(sd_bus **ret) {
1222 assert_return(ret, -EINVAL);
1228 r = bus_set_address_system(b);
1232 b->bus_client = true;
1233 b->is_system = true;
1235 /* Let's do per-method access control on the system bus. We
1236 * need the caller's UID and capability set for that. */
1238 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1239 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1241 r = sd_bus_start(b);
1253 #if 0 /// elogind can not open/use a user bus
1254 int bus_set_address_user(sd_bus *b) {
1261 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1263 return sd_bus_set_address(b, e);
1265 r = cg_pid_get_owner_uid(0, &uid);
1269 e = secure_getenv("XDG_RUNTIME_DIR");
1271 _cleanup_free_ char *ee = NULL;
1273 ee = bus_address_escape(e);
1277 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, ee);
1279 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, uid);
1288 _public_ int sd_bus_open_user(sd_bus **ret) {
1289 #if 0 /// elogind does not support user buses
1293 assert_return(ret, -EINVAL);
1299 r = bus_set_address_user(b);
1303 b->bus_client = true;
1306 /* We don't do any per-method access control on the user
1310 r = sd_bus_start(b);
1321 return sd_bus_open_system(ret);
1325 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1326 _cleanup_free_ char *e = NULL;
1327 char *m = NULL, *c = NULL;
1332 /* Let's see if we shall enter some container */
1333 m = strchr(host, ':');
1337 /* Let's make sure this is not a port of some kind,
1338 * and is a valid machine name. */
1339 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1342 /* Cut out the host part */
1343 t = strndupa(host, m - host - 1);
1344 e = bus_address_escape(t);
1348 c = strjoina(",argv4=--machine=", m);
1353 e = bus_address_escape(host);
1358 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", c);
1365 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1369 assert_return(host, -EINVAL);
1370 assert_return(ret, -EINVAL);
1372 r = sd_bus_new(&bus);
1376 r = bus_set_address_system_remote(bus, host);
1380 bus->bus_client = true;
1381 bus->trusted = false;
1382 bus->is_system = true;
1384 r = sd_bus_start(bus);
1396 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1397 _cleanup_free_ char *e = NULL;
1402 e = bus_address_escape(machine);
1406 b->address = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e);
1413 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1417 assert_return(machine, -EINVAL);
1418 assert_return(ret, -EINVAL);
1419 assert_return(machine_name_is_valid(machine), -EINVAL);
1421 r = sd_bus_new(&bus);
1425 r = bus_set_address_system_machine(bus, machine);
1429 bus->bus_client = true;
1430 bus->trusted = false;
1431 bus->is_system = true;
1433 r = sd_bus_start(bus);
1445 _public_ void sd_bus_close(sd_bus *bus) {
1449 if (bus->state == BUS_CLOSED)
1451 if (bus_pid_changed(bus))
1454 bus->state = BUS_CLOSED;
1456 sd_bus_detach_event(bus);
1458 /* Drop all queued messages so that they drop references to
1459 * the bus object and the bus may be freed */
1460 bus_reset_queues(bus);
1462 if (!bus->is_kernel)
1465 /* We'll leave the fd open in case this is a kernel bus, since
1466 * there might still be memblocks around that reference this
1467 * bus, and they might need to invoke the KDBUS_CMD_FREE
1468 * ioctl on the fd when they are freed. */
1471 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1479 return sd_bus_unref(bus);
1482 static void bus_enter_closing(sd_bus *bus) {
1485 if (bus->state != BUS_OPENING &&
1486 bus->state != BUS_AUTHENTICATING &&
1487 bus->state != BUS_HELLO &&
1488 bus->state != BUS_RUNNING)
1491 bus->state = BUS_CLOSING;
1494 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1499 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1504 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1510 i = REFCNT_DEC(bus->n_ref);
1518 #if 0 /// UNNEEDED by elogind
1519 _public_ int sd_bus_is_open(sd_bus *bus) {
1521 assert_return(bus, -EINVAL);
1522 assert_return(!bus_pid_changed(bus), -ECHILD);
1524 return BUS_IS_OPEN(bus->state);
1528 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1531 assert_return(bus, -EINVAL);
1532 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1533 assert_return(!bus_pid_changed(bus), -ECHILD);
1535 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1538 if (type == SD_BUS_TYPE_UNIX_FD) {
1539 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1542 r = bus_ensure_running(bus);
1546 return bus->can_fds;
1549 return bus_type_is_valid(type);
1552 #if 0 /// UNNEEDED by elogind
1553 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1556 assert_return(bus, -EINVAL);
1557 assert_return(id, -EINVAL);
1558 assert_return(!bus_pid_changed(bus), -ECHILD);
1560 r = bus_ensure_running(bus);
1564 *id = bus->server_id;
1569 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1574 /* If we copy the same message to multiple
1575 * destinations, avoid using the same cookie
1577 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1582 timeout = BUS_DEFAULT_TIMEOUT;
1584 return bus_message_seal(m, ++b->cookie, timeout);
1587 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1588 bool remarshal = false;
1592 /* wrong packet version */
1593 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1596 /* wrong packet endianness */
1597 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1600 /* TODO: kdbus-messages received from the kernel contain data which is
1601 * not allowed to be passed to KDBUS_CMD_SEND. Therefore, we have to
1602 * force remarshaling of the message. Technically, we could just
1603 * recreate the kdbus message, but that is non-trivial as other parts of
1604 * the message refer to m->kdbus already. This should be fixed! */
1605 if ((*m)->kdbus && (*m)->release_kdbus)
1608 return remarshal ? bus_message_remarshal(b, m) : 0;
1611 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1615 /* Fake some timestamps, if they were requested, and not
1616 * already initialized */
1617 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1618 if (m->realtime <= 0)
1619 m->realtime = now(CLOCK_REALTIME);
1621 if (m->monotonic <= 0)
1622 m->monotonic = now(CLOCK_MONOTONIC);
1625 /* The bus specification says the serial number cannot be 0,
1626 * hence let's fill something in for synthetic messages. Since
1627 * synthetic messages might have a fake sender and we don't
1628 * want to interfere with the real sender's serial numbers we
1629 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1630 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1631 * even though kdbus can do 64bit. */
1632 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1635 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1642 r = bus_kernel_write_message(bus, m, hint_sync_call);
1644 r = bus_socket_write_message(bus, m, idx);
1649 if (bus->is_kernel || *idx >= BUS_MESSAGE_SIZE(m))
1650 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s",
1651 bus_message_type_to_string(m->header->type),
1652 strna(sd_bus_message_get_sender(m)),
1653 strna(sd_bus_message_get_destination(m)),
1654 strna(sd_bus_message_get_path(m)),
1655 strna(sd_bus_message_get_interface(m)),
1656 strna(sd_bus_message_get_member(m)),
1657 BUS_MESSAGE_COOKIE(m),
1659 strna(m->error.message));
1664 static int dispatch_wqueue(sd_bus *bus) {
1668 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1670 while (bus->wqueue_size > 0) {
1672 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1676 /* Didn't do anything this time */
1678 else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1679 /* Fully written. Let's drop the entry from
1682 * This isn't particularly optimized, but
1683 * well, this is supposed to be our worst-case
1684 * buffer only, and the socket buffer is
1685 * supposed to be our primary buffer, and if
1686 * it got full, then all bets are off
1690 sd_bus_message_unref(bus->wqueue[0]);
1691 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1701 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1705 return bus_kernel_read_message(bus, hint_priority, priority);
1707 return bus_socket_read_message(bus);
1710 int bus_rqueue_make_room(sd_bus *bus) {
1713 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1716 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1722 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1727 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1729 /* Note that the priority logic is only available on kdbus,
1730 * where the rqueue is unused. We check the rqueue here
1731 * anyway, because it's simple... */
1734 if (bus->rqueue_size > 0) {
1735 /* Dispatch a queued message */
1737 *m = bus->rqueue[0];
1739 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1743 /* Try to read a new message */
1744 r = bus_read_message(bus, hint_priority, priority);
1754 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1755 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1758 assert_return(m, -EINVAL);
1763 assert_return(!bus_pid_changed(bus), -ECHILD);
1764 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1766 if (!BUS_IS_OPEN(bus->state))
1770 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1777 /* If the cookie number isn't kept, then we know that no reply
1779 if (!cookie && !m->sealed)
1780 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1782 r = bus_seal_message(bus, m, 0);
1786 /* Remarshall if we have to. This will possibly unref the
1787 * message and place a replacement in m */
1788 r = bus_remarshal_message(bus, &m);
1792 /* If this is a reply and no reply was requested, then let's
1793 * suppress this, if we can */
1797 if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
1800 r = bus_write_message(bus, m, hint_sync_call, &idx);
1802 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1803 bus_enter_closing(bus);
1810 if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) {
1811 /* Wasn't fully written. So let's remember how
1812 * much was written. Note that the first entry
1813 * of the wqueue array is always allocated so
1814 * that we always can remember how much was
1816 bus->wqueue[0] = sd_bus_message_ref(m);
1817 bus->wqueue_size = 1;
1822 /* Just append it to the queue. */
1824 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1827 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1830 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1835 *cookie = BUS_MESSAGE_COOKIE(m);
1840 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1841 return bus_send_internal(bus, m, cookie, false);
1844 #if 0 /// UNNEEDED by elogind
1845 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1848 assert_return(m, -EINVAL);
1853 assert_return(!bus_pid_changed(bus), -ECHILD);
1855 if (!BUS_IS_OPEN(bus->state))
1858 if (!streq_ptr(m->destination, destination)) {
1863 r = sd_bus_message_set_destination(m, destination);
1868 return sd_bus_send(bus, m, cookie);
1872 static usec_t calc_elapse(uint64_t usec) {
1873 if (usec == (uint64_t) -1)
1876 return now(CLOCK_MONOTONIC) + usec;
1879 static int timeout_compare(const void *a, const void *b) {
1880 const struct reply_callback *x = a, *y = b;
1882 if (x->timeout != 0 && y->timeout == 0)
1885 if (x->timeout == 0 && y->timeout != 0)
1888 if (x->timeout < y->timeout)
1891 if (x->timeout > y->timeout)
1897 _public_ int sd_bus_call_async(
1901 sd_bus_message_handler_t callback,
1905 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1906 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1909 assert_return(m, -EINVAL);
1910 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1911 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1912 assert_return(callback, -EINVAL);
1917 assert_return(!bus_pid_changed(bus), -ECHILD);
1918 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1920 if (!BUS_IS_OPEN(bus->state))
1923 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1927 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1931 r = bus_seal_message(bus, m, usec);
1935 r = bus_remarshal_message(bus, &m);
1939 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1943 s->reply_callback.callback = callback;
1945 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1946 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1948 s->reply_callback.cookie = 0;
1952 s->reply_callback.timeout = calc_elapse(m->timeout);
1953 if (s->reply_callback.timeout != 0) {
1954 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1956 s->reply_callback.timeout = 0;
1961 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1972 int bus_ensure_running(sd_bus *bus) {
1977 if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING)
1979 if (bus->state == BUS_RUNNING)
1983 r = sd_bus_process(bus, NULL);
1986 if (bus->state == BUS_RUNNING)
1991 r = sd_bus_wait(bus, (uint64_t) -1);
1997 _public_ int sd_bus_call(
2001 sd_bus_error *error,
2002 sd_bus_message **reply) {
2004 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2010 bus_assert_return(m, -EINVAL, error);
2011 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2012 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2013 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2018 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2019 bus_assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS, error);
2021 if (!BUS_IS_OPEN(bus->state)) {
2026 r = bus_ensure_running(bus);
2030 i = bus->rqueue_size;
2032 r = bus_seal_message(bus, m, usec);
2036 r = bus_remarshal_message(bus, &m);
2040 r = bus_send_internal(bus, m, &cookie, true);
2044 timeout = calc_elapse(m->timeout);
2049 while (i < bus->rqueue_size) {
2050 sd_bus_message *incoming = NULL;
2052 incoming = bus->rqueue[i];
2054 if (incoming->reply_cookie == cookie) {
2055 /* Found a match! */
2057 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2059 log_debug_bus_message(incoming);
2061 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2063 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2067 sd_bus_message_unref(incoming);
2072 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2073 sd_bus_message_unref(incoming);
2076 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2077 r = sd_bus_error_copy(error, &incoming->error);
2078 sd_bus_message_unref(incoming);
2085 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2088 streq(bus->unique_name, incoming->sender)) {
2090 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2093 /* Our own message? Somebody is trying
2094 * to send its own client a message,
2095 * let's not dead-lock, let's fail
2098 sd_bus_message_unref(incoming);
2103 /* Try to read more, right-away */
2107 r = bus_read_message(bus, false, 0);
2109 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2110 bus_enter_closing(bus);
2122 n = now(CLOCK_MONOTONIC);
2130 left = (uint64_t) -1;
2132 r = bus_poll(bus, true, left);
2140 r = dispatch_wqueue(bus);
2142 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2143 bus_enter_closing(bus);
2152 return sd_bus_error_set_errno(error, r);
2155 #if 0 /// UNNEEDED by elogind
2156 _public_ int sd_bus_get_fd(sd_bus *bus) {
2158 assert_return(bus, -EINVAL);
2159 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2160 assert_return(!bus_pid_changed(bus), -ECHILD);
2162 return bus->input_fd;
2166 _public_ int sd_bus_get_events(sd_bus *bus) {
2169 assert_return(bus, -EINVAL);
2170 assert_return(!bus_pid_changed(bus), -ECHILD);
2172 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2175 if (bus->state == BUS_OPENING)
2177 else if (bus->state == BUS_AUTHENTICATING) {
2179 if (bus_socket_auth_needs_write(bus))
2184 } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
2185 if (bus->rqueue_size <= 0)
2187 if (bus->wqueue_size > 0)
2194 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2195 struct reply_callback *c;
2197 assert_return(bus, -EINVAL);
2198 assert_return(timeout_usec, -EINVAL);
2199 assert_return(!bus_pid_changed(bus), -ECHILD);
2201 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2204 if (bus->track_queue) {
2209 if (bus->state == BUS_CLOSING) {
2214 if (bus->state == BUS_AUTHENTICATING) {
2215 *timeout_usec = bus->auth_timeout;
2219 if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) {
2220 *timeout_usec = (uint64_t) -1;
2224 if (bus->rqueue_size > 0) {
2229 c = prioq_peek(bus->reply_callbacks_prioq);
2231 *timeout_usec = (uint64_t) -1;
2235 if (c->timeout == 0) {
2236 *timeout_usec = (uint64_t) -1;
2240 *timeout_usec = c->timeout;
2244 static int process_timeout(sd_bus *bus) {
2245 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2246 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2247 struct reply_callback *c;
2254 c = prioq_peek(bus->reply_callbacks_prioq);
2258 n = now(CLOCK_MONOTONIC);
2262 r = bus_message_new_synthetic_error(
2265 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2270 r = bus_seal_synthetic_message(bus, m);
2274 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2277 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2280 slot = container_of(c, sd_bus_slot, reply_callback);
2282 bus->iteration_counter++;
2284 bus->current_message = m;
2285 bus->current_slot = sd_bus_slot_ref(slot);
2286 bus->current_handler = c->callback;
2287 bus->current_userdata = slot->userdata;
2288 r = c->callback(m, slot->userdata, &error_buffer);
2289 bus->current_userdata = NULL;
2290 bus->current_handler = NULL;
2291 bus->current_slot = NULL;
2292 bus->current_message = NULL;
2294 if (slot->floating) {
2295 bus_slot_disconnect(slot);
2296 sd_bus_slot_unref(slot);
2299 sd_bus_slot_unref(slot);
2301 return bus_maybe_reply_error(m, r, &error_buffer);
2304 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2308 if (bus->state != BUS_HELLO)
2311 /* Let's make sure the first message on the bus is the HELLO
2312 * reply. But note that we don't actually parse the message
2313 * here (we leave that to the usual handling), we just verify
2314 * we don't let any earlier msg through. */
2316 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2317 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2320 if (m->reply_cookie != 1)
2326 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2327 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2328 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2329 struct reply_callback *c;
2336 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2337 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2340 if (bus->is_kernel && (bus->hello_flags & KDBUS_HELLO_MONITOR))
2343 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2346 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2352 slot = container_of(c, sd_bus_slot, reply_callback);
2354 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2356 /* If the reply contained a file descriptor which we
2357 * didn't want we pass an error instead. */
2359 r = bus_message_new_synthetic_error(
2362 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2367 /* Copy over original timestamp */
2368 synthetic_reply->realtime = m->realtime;
2369 synthetic_reply->monotonic = m->monotonic;
2370 synthetic_reply->seqnum = m->seqnum;
2372 r = bus_seal_synthetic_message(bus, synthetic_reply);
2376 m = synthetic_reply;
2378 r = sd_bus_message_rewind(m, true);
2383 if (c->timeout != 0) {
2384 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2388 bus->current_slot = sd_bus_slot_ref(slot);
2389 bus->current_handler = c->callback;
2390 bus->current_userdata = slot->userdata;
2391 r = c->callback(m, slot->userdata, &error_buffer);
2392 bus->current_userdata = NULL;
2393 bus->current_handler = NULL;
2394 bus->current_slot = NULL;
2396 if (slot->floating) {
2397 bus_slot_disconnect(slot);
2398 sd_bus_slot_unref(slot);
2401 sd_bus_slot_unref(slot);
2403 return bus_maybe_reply_error(m, r, &error_buffer);
2406 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2407 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2408 struct filter_callback *l;
2415 bus->filter_callbacks_modified = false;
2417 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2420 if (bus->filter_callbacks_modified)
2423 /* Don't run this more than once per iteration */
2424 if (l->last_iteration == bus->iteration_counter)
2427 l->last_iteration = bus->iteration_counter;
2429 r = sd_bus_message_rewind(m, true);
2433 slot = container_of(l, sd_bus_slot, filter_callback);
2435 bus->current_slot = sd_bus_slot_ref(slot);
2436 bus->current_handler = l->callback;
2437 bus->current_userdata = slot->userdata;
2438 r = l->callback(m, slot->userdata, &error_buffer);
2439 bus->current_userdata = NULL;
2440 bus->current_handler = NULL;
2441 bus->current_slot = sd_bus_slot_unref(slot);
2443 r = bus_maybe_reply_error(m, r, &error_buffer);
2449 } while (bus->filter_callbacks_modified);
2454 static int process_match(sd_bus *bus, sd_bus_message *m) {
2461 bus->match_callbacks_modified = false;
2463 r = bus_match_run(bus, &bus->match_callbacks, m);
2467 } while (bus->match_callbacks_modified);
2472 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2473 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2479 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2482 if (bus->manual_peer_interface)
2485 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2488 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2491 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2494 if (streq_ptr(m->member, "Ping"))
2495 r = sd_bus_message_new_method_return(m, &reply);
2496 else if (streq_ptr(m->member, "GetMachineId")) {
2500 r = sd_id128_get_machine(&id);
2504 r = sd_bus_message_new_method_return(m, &reply);
2508 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2510 r = sd_bus_message_new_method_errorf(
2512 SD_BUS_ERROR_UNKNOWN_METHOD,
2513 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2519 r = sd_bus_send(bus, reply, NULL);
2526 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2530 /* If we got a message with a file descriptor which we didn't
2531 * want to accept, then let's drop it. How can this even
2532 * happen? For example, when the kernel queues a message into
2533 * an activatable names's queue which allows fds, and then is
2534 * delivered to us later even though we ourselves did not
2537 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2543 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2546 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2547 return 1; /* just eat it up */
2549 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2552 static int process_message(sd_bus *bus, sd_bus_message *m) {
2558 bus->current_message = m;
2559 bus->iteration_counter++;
2561 log_debug_bus_message(m);
2563 r = process_hello(bus, m);
2567 r = process_reply(bus, m);
2571 r = process_fd_check(bus, m);
2575 r = process_filter(bus, m);
2579 r = process_match(bus, m);
2583 r = process_builtin(bus, m);
2587 r = bus_process_object(bus, m);
2590 bus->current_message = NULL;
2594 static int dispatch_track(sd_bus *bus) {
2597 if (!bus->track_queue)
2600 bus_track_dispatch(bus->track_queue);
2604 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2605 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2609 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
2611 r = process_timeout(bus);
2615 r = dispatch_wqueue(bus);
2619 r = dispatch_track(bus);
2623 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2629 r = process_message(bus, m);
2634 r = sd_bus_message_rewind(m, true);
2643 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2645 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2646 strna(sd_bus_message_get_sender(m)),
2647 strna(sd_bus_message_get_path(m)),
2648 strna(sd_bus_message_get_interface(m)),
2649 strna(sd_bus_message_get_member(m)));
2651 r = sd_bus_reply_method_errorf(
2653 SD_BUS_ERROR_UNKNOWN_OBJECT,
2654 "Unknown object '%s'.", m->path);
2668 static int bus_exit_now(sd_bus *bus) {
2671 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2672 * sd_event_exit(), otherwise invokes libc exit(). */
2674 if (bus->exited) /* did we already exit? */
2676 if (!bus->exit_triggered) /* was the exit condition triggered? */
2678 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2681 bus->exited = true; /* never exit more than once */
2683 log_debug("Bus connection disconnected, exiting.");
2686 return sd_event_exit(bus->event, EXIT_FAILURE);
2690 assert_not_reached("exit() didn't exit?");
2693 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2694 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2695 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2702 r = bus_message_new_synthetic_error(
2705 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2710 r = bus_seal_synthetic_message(bus, m);
2714 if (c->timeout != 0) {
2715 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2719 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2722 slot = container_of(c, sd_bus_slot, reply_callback);
2724 bus->iteration_counter++;
2726 bus->current_message = m;
2727 bus->current_slot = sd_bus_slot_ref(slot);
2728 bus->current_handler = c->callback;
2729 bus->current_userdata = slot->userdata;
2730 r = c->callback(m, slot->userdata, &error_buffer);
2731 bus->current_userdata = NULL;
2732 bus->current_handler = NULL;
2733 bus->current_slot = NULL;
2734 bus->current_message = NULL;
2736 if (slot->floating) {
2737 bus_slot_disconnect(slot);
2738 sd_bus_slot_unref(slot);
2741 sd_bus_slot_unref(slot);
2743 return bus_maybe_reply_error(m, r, &error_buffer);
2746 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2747 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2748 struct reply_callback *c;
2752 assert(bus->state == BUS_CLOSING);
2754 /* First, fail all outstanding method calls */
2755 c = ordered_hashmap_first(bus->reply_callbacks);
2757 return process_closing_reply_callback(bus, c);
2759 /* Then, fake-drop all remaining bus tracking references */
2761 bus_track_close(bus->tracks);
2765 /* Then, synthesize a Disconnected message */
2766 r = sd_bus_message_new_signal(
2769 "/org/freedesktop/DBus/Local",
2770 "org.freedesktop.DBus.Local",
2775 bus_message_set_sender_local(bus, m);
2777 r = bus_seal_synthetic_message(bus, m);
2783 bus->current_message = m;
2784 bus->iteration_counter++;
2786 r = process_filter(bus, m);
2790 r = process_match(bus, m);
2794 /* Nothing else to do, exit now, if the condition holds */
2795 bus->exit_triggered = true;
2796 (void) bus_exit_now(bus);
2806 bus->current_message = NULL;
2811 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2812 BUS_DONT_DESTROY(bus);
2815 /* Returns 0 when we didn't do anything. This should cause the
2816 * caller to invoke sd_bus_wait() before returning the next
2817 * time. Returns > 0 when we did something, which possibly
2818 * means *ret is filled in with an unprocessed message. */
2820 assert_return(bus, -EINVAL);
2821 assert_return(!bus_pid_changed(bus), -ECHILD);
2823 /* We don't allow recursively invoking sd_bus_process(). */
2824 assert_return(!bus->current_message, -EBUSY);
2825 assert(!bus->current_slot);
2827 switch (bus->state) {
2836 r = bus_socket_process_opening(bus);
2837 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2838 bus_enter_closing(bus);
2846 case BUS_AUTHENTICATING:
2847 r = bus_socket_process_authenticating(bus);
2848 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2849 bus_enter_closing(bus);
2861 r = process_running(bus, hint_priority, priority, ret);
2862 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2863 bus_enter_closing(bus);
2873 return process_closing(bus, ret);
2876 assert_not_reached("Unknown state");
2879 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2880 return bus_process_internal(bus, false, 0, ret);
2883 #if 0 /// UNNEEDED by elogind
2884 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2885 return bus_process_internal(bus, true, priority, ret);
2889 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2890 struct pollfd p[2] = {};
2893 usec_t m = USEC_INFINITY;
2897 if (bus->state == BUS_CLOSING)
2900 if (!BUS_IS_OPEN(bus->state))
2903 e = sd_bus_get_events(bus);
2908 /* The caller really needs some more data, he doesn't
2909 * care about what's already read, or any timeouts
2910 * except its own. */
2914 /* The caller wants to process if there's something to
2915 * process, but doesn't care otherwise */
2917 r = sd_bus_get_timeout(bus, &until);
2922 nw = now(CLOCK_MONOTONIC);
2923 m = until > nw ? until - nw : 0;
2927 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2930 p[0].fd = bus->input_fd;
2931 if (bus->output_fd == bus->input_fd) {
2935 p[0].events = e & POLLIN;
2936 p[1].fd = bus->output_fd;
2937 p[1].events = e & POLLOUT;
2941 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2945 return r > 0 ? 1 : 0;
2948 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2950 assert_return(bus, -EINVAL);
2951 assert_return(!bus_pid_changed(bus), -ECHILD);
2953 if (bus->state == BUS_CLOSING)
2956 if (!BUS_IS_OPEN(bus->state))
2959 if (bus->rqueue_size > 0)
2962 return bus_poll(bus, false, timeout_usec);
2965 _public_ int sd_bus_flush(sd_bus *bus) {
2968 assert_return(bus, -EINVAL);
2969 assert_return(!bus_pid_changed(bus), -ECHILD);
2971 if (bus->state == BUS_CLOSING)
2974 if (!BUS_IS_OPEN(bus->state))
2977 r = bus_ensure_running(bus);
2981 if (bus->wqueue_size <= 0)
2985 r = dispatch_wqueue(bus);
2987 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2988 bus_enter_closing(bus);
2995 if (bus->wqueue_size <= 0)
2998 r = bus_poll(bus, false, (uint64_t) -1);
3004 #if 0 /// UNNEEDED by elogind
3005 _public_ int sd_bus_add_filter(
3008 sd_bus_message_handler_t callback,
3013 assert_return(bus, -EINVAL);
3014 assert_return(callback, -EINVAL);
3015 assert_return(!bus_pid_changed(bus), -ECHILD);
3017 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3021 s->filter_callback.callback = callback;
3023 bus->filter_callbacks_modified = true;
3024 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3033 _public_ int sd_bus_add_match(
3037 sd_bus_message_handler_t callback,
3040 struct bus_match_component *components = NULL;
3041 unsigned n_components = 0;
3042 sd_bus_slot *s = NULL;
3045 assert_return(bus, -EINVAL);
3046 assert_return(match, -EINVAL);
3047 assert_return(!bus_pid_changed(bus), -ECHILD);
3049 r = bus_match_parse(match, &components, &n_components);
3053 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3059 s->match_callback.callback = callback;
3060 s->match_callback.cookie = ++bus->match_cookie;
3062 if (bus->bus_client) {
3063 enum bus_match_scope scope;
3065 scope = bus_match_get_scope(components, n_components);
3067 /* Do not install server-side matches for matches
3068 * against the local service, interface or bus
3070 if (scope != BUS_MATCH_LOCAL) {
3072 if (!bus->is_kernel) {
3073 /* When this is not a kernel transport, we
3074 * store the original match string, so that we
3075 * can use it to remove the match again */
3077 s->match_callback.match_string = strdup(match);
3078 if (!s->match_callback.match_string) {
3084 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components, s->match_callback.cookie);
3088 s->match_added = true;
3092 bus->match_callbacks_modified = true;
3093 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3102 bus_match_parse_free(components, n_components);
3103 sd_bus_slot_unref(s);
3108 #if 0 /// UNNEEDED by elogind
3109 int bus_remove_match_by_string(
3112 sd_bus_message_handler_t callback,
3115 struct bus_match_component *components = NULL;
3116 unsigned n_components = 0;
3117 struct match_callback *c;
3120 assert_return(bus, -EINVAL);
3121 assert_return(match, -EINVAL);
3122 assert_return(!bus_pid_changed(bus), -ECHILD);
3124 r = bus_match_parse(match, &components, &n_components);
3128 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
3132 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
3135 bus_match_parse_free(components, n_components);
3141 bool bus_pid_changed(sd_bus *bus) {
3144 /* We don't support people creating a bus connection and
3145 * keeping it around over a fork(). Let's complain. */
3147 return bus->original_pid != getpid();
3150 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3151 sd_bus *bus = userdata;
3156 r = sd_bus_process(bus, NULL);
3163 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3164 sd_bus *bus = userdata;
3169 r = sd_bus_process(bus, NULL);
3176 static int prepare_callback(sd_event_source *s, void *userdata) {
3177 sd_bus *bus = userdata;
3184 e = sd_bus_get_events(bus);
3188 if (bus->output_fd != bus->input_fd) {
3190 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3194 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3198 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3203 r = sd_bus_get_timeout(bus, &until);
3209 j = sd_event_source_set_time(bus->time_event_source, until);
3214 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3221 static int quit_callback(sd_event_source *event, void *userdata) {
3222 sd_bus *bus = userdata;
3232 static int attach_io_events(sd_bus *bus) {
3237 if (bus->input_fd < 0)
3243 if (!bus->input_io_event_source) {
3244 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3248 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3252 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3256 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3258 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3263 if (bus->output_fd != bus->input_fd) {
3264 assert(bus->output_fd >= 0);
3266 if (!bus->output_io_event_source) {
3267 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3271 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3275 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3277 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3286 static void detach_io_events(sd_bus *bus) {
3289 if (bus->input_io_event_source) {
3290 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3291 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3294 if (bus->output_io_event_source) {
3295 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3296 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3300 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3303 assert_return(bus, -EINVAL);
3304 assert_return(!bus->event, -EBUSY);
3306 assert(!bus->input_io_event_source);
3307 assert(!bus->output_io_event_source);
3308 assert(!bus->time_event_source);
3311 bus->event = sd_event_ref(event);
3313 r = sd_event_default(&bus->event);
3318 bus->event_priority = priority;
3320 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3324 r = sd_event_source_set_priority(bus->time_event_source, priority);
3328 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3332 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3336 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3340 r = attach_io_events(bus);
3347 sd_bus_detach_event(bus);
3351 _public_ int sd_bus_detach_event(sd_bus *bus) {
3352 assert_return(bus, -EINVAL);
3357 detach_io_events(bus);
3359 if (bus->time_event_source) {
3360 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3361 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3364 if (bus->quit_event_source) {
3365 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3366 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3369 bus->event = sd_event_unref(bus->event);
3373 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3374 assert_return(bus, NULL);
3379 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3380 assert_return(bus, NULL);
3382 return bus->current_message;
3385 #if 0 /// UNNEEDED by elogind
3386 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3387 assert_return(bus, NULL);
3389 return bus->current_slot;
3393 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3394 assert_return(bus, NULL);
3396 return bus->current_handler;
3399 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3400 assert_return(bus, NULL);
3402 return bus->current_userdata;
3405 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3410 assert(default_bus);
3413 return !!*default_bus;
3416 *ret = sd_bus_ref(*default_bus);
3424 b->default_bus_ptr = default_bus;
3432 _public_ int sd_bus_default_system(sd_bus **ret) {
3433 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3437 _public_ int sd_bus_default_user(sd_bus **ret) {
3438 #if 0 /// elogind does not support user buses
3439 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3441 return sd_bus_default_system(ret);
3445 _public_ int sd_bus_default(sd_bus **ret) {
3449 /* Let's try our best to reuse another cached connection. If
3450 * the starter bus type is set, connect via our normal
3451 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3452 * we can share the connection with the user/system default
3455 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3457 if (streq(e, "system"))
3458 return sd_bus_default_system(ret);
3459 #if 0 /// elogind does not support systemd units
3460 else if (STR_IN_SET(e, "user", "session"))
3461 return sd_bus_default_user(ret);
3465 /* No type is specified, so we have not other option than to
3466 * use the starter address if it is set. */
3468 e = secure_getenv("DBUS_STARTER_ADDRESS");
3471 return bus_default(sd_bus_open, &default_starter_bus, ret);
3474 /* Finally, if nothing is set use the cached connection for
3475 * the right scope */
3477 #if 0 /// elogind does not support systemd units
3478 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3479 return sd_bus_default_user(ret);
3482 return sd_bus_default_system(ret);
3485 #if 0 /// UNNEEDED by elogind
3486 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3487 assert_return(b, -EINVAL);
3488 assert_return(tid, -EINVAL);
3489 assert_return(!bus_pid_changed(b), -ECHILD);
3497 return sd_event_get_tid(b->event, tid);
3502 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3503 _cleanup_free_ char *e = NULL;
3506 assert_return(object_path_is_valid(prefix), -EINVAL);
3507 assert_return(external_id, -EINVAL);
3508 assert_return(ret_path, -EINVAL);
3510 e = bus_label_escape(external_id);
3514 ret = strjoin(prefix, "/", e);
3522 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3526 assert_return(object_path_is_valid(path), -EINVAL);
3527 assert_return(object_path_is_valid(prefix), -EINVAL);
3528 assert_return(external_id, -EINVAL);
3530 e = object_path_startswith(path, prefix);
3532 *external_id = NULL;
3536 ret = bus_label_unescape(e);
3544 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3545 _cleanup_strv_free_ char **labels = NULL;
3546 char *path, *path_pos, **label_pos;
3547 const char *sep, *template_pos;
3552 assert_return(out, -EINVAL);
3553 assert_return(path_template, -EINVAL);
3555 path_length = strlen(path_template);
3557 va_start(list, path_template);
3558 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3562 arg = va_arg(list, const char *);
3568 label = bus_label_escape(arg);
3574 r = strv_consume(&labels, label);
3580 /* add label length, but account for the format character */
3581 path_length += strlen(label) - 1;
3585 path = malloc(path_length + 1);
3592 for (template_pos = path_template; *template_pos; ) {
3593 sep = strchrnul(template_pos, '%');
3594 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3598 path_pos = stpcpy(path_pos, *label_pos++);
3599 template_pos = sep + 1;
3607 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3608 _cleanup_strv_free_ char **labels = NULL;
3609 const char *template_pos, *path_pos;
3615 * This decodes an object-path based on a template argument. The
3616 * template consists of a verbatim path, optionally including special
3619 * - Each occurrence of '%' in the template matches an arbitrary
3620 * substring of a label in the given path. At most one such
3621 * directive is allowed per label. For each such directive, the
3622 * caller must provide an output parameter (char **) via va_arg. If
3623 * NULL is passed, the given label is verified, but not returned.
3624 * For each matched label, the *decoded* label is stored in the
3625 * passed output argument, and the caller is responsible to free
3626 * it. Note that the output arguments are only modified if the
3627 * actualy path matched the template. Otherwise, they're left
3630 * This function returns <0 on error, 0 if the path does not match the
3631 * template, 1 if it matched.
3634 assert_return(path, -EINVAL);
3635 assert_return(path_template, -EINVAL);
3639 for (template_pos = path_template; *template_pos; ) {
3644 /* verify everything until the next '%' matches verbatim */
3645 sep = strchrnul(template_pos, '%');
3646 length = sep - template_pos;
3647 if (strncmp(path_pos, template_pos, length))
3651 template_pos += length;
3656 /* We found the next '%' character. Everything up until here
3657 * matched. We now skip ahead to the end of this label and make
3658 * sure it matches the tail of the label in the path. Then we
3659 * decode the string in-between and save it for later use. */
3661 ++template_pos; /* skip over '%' */
3663 sep = strchrnul(template_pos, '/');
3664 length = sep - template_pos; /* length of suffix to match verbatim */
3666 /* verify the suffixes match */
3667 sep = strchrnul(path_pos, '/');
3668 if (sep - path_pos < (ssize_t)length ||
3669 strncmp(sep - length, template_pos, length))
3672 template_pos += length; /* skip over matched label */
3673 length = sep - path_pos - length; /* length of sub-label to decode */
3675 /* store unescaped label for later use */
3676 label = bus_label_unescape_n(path_pos, length);
3680 r = strv_consume(&labels, label);
3684 path_pos = sep; /* skip decoded label and suffix */
3687 /* end of template must match end of path */
3691 /* copy the labels over to the caller */
3692 va_start(list, path_template);
3693 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3696 arg = va_arg(list, char **);
3709 _public_ int sd_bus_try_close(sd_bus *bus) {
3712 assert_return(bus, -EINVAL);
3713 assert_return(!bus_pid_changed(bus), -ECHILD);
3715 if (!bus->is_kernel)
3718 if (!BUS_IS_OPEN(bus->state))
3721 if (bus->rqueue_size > 0)
3724 if (bus->wqueue_size > 0)
3727 r = bus_kernel_try_close(bus);
3735 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3736 assert_return(bus, -EINVAL);
3737 assert_return(description, -EINVAL);
3738 assert_return(bus->description, -ENXIO);
3739 assert_return(!bus_pid_changed(bus), -ECHILD);
3741 *description = bus->description;
3746 int bus_get_root_path(sd_bus *bus) {
3749 if (bus->cgroup_root)
3752 r = cg_get_root_path(&bus->cgroup_root);
3754 bus->cgroup_root = strdup("/");
3755 if (!bus->cgroup_root)
3764 #if 0 /// UNNEEDED by elogind
3765 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3768 assert_return(bus, -EINVAL);
3769 assert_return(scope, -EINVAL);
3770 assert_return(!bus_pid_changed(bus), -ECHILD);
3772 if (bus->is_kernel) {
3773 _cleanup_free_ char *n = NULL;
3776 r = bus_kernel_get_bus_name(bus, &n);
3780 if (streq(n, "0-system")) {
3785 dash = strchr(n, '-');
3786 if (streq_ptr(dash, "-user")) {
3797 if (bus->is_system) {
3805 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3807 assert_return(bus, -EINVAL);
3808 assert_return(address, -EINVAL);
3809 assert_return(!bus_pid_changed(bus), -ECHILD);
3812 *address = bus->address;
3819 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3820 assert_return(bus, -EINVAL);
3821 assert_return(mask, -EINVAL);
3822 assert_return(!bus_pid_changed(bus), -ECHILD);
3824 *mask = bus->creds_mask;
3828 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3829 assert_return(bus, -EINVAL);
3830 assert_return(!bus_pid_changed(bus), -ECHILD);
3832 return bus->bus_client;
3835 _public_ int sd_bus_is_server(sd_bus *bus) {
3836 assert_return(bus, -EINVAL);
3837 assert_return(!bus_pid_changed(bus), -ECHILD);
3839 return bus->is_server;
3842 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3843 assert_return(bus, -EINVAL);
3844 assert_return(!bus_pid_changed(bus), -ECHILD);
3846 return bus->anonymous_auth;
3849 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3850 assert_return(bus, -EINVAL);
3851 assert_return(!bus_pid_changed(bus), -ECHILD);
3853 return bus->trusted;
3856 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3857 assert_return(bus, -EINVAL);
3858 assert_return(!bus_pid_changed(bus), -ECHILD);
3860 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3863 static void flush_close(sd_bus *bus) {
3867 /* Flushes and closes the specified bus. We take a ref before,
3868 * to ensure the flushing does not cause the bus to be
3871 sd_bus_flush_close_unref(sd_bus_ref(bus));
3874 _public_ void sd_bus_default_flush_close(void) {
3875 flush_close(default_starter_bus);
3876 flush_close(default_user_bus);
3877 flush_close(default_system_bus);
3881 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
3882 assert_return(bus, -EINVAL);
3884 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
3885 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
3886 * from the client side. */
3887 bus->exit_on_disconnect = b;
3889 /* If the exit condition was triggered already, exit immediately. */
3890 return bus_exit_now(bus);
3893 #if 0 /// UNNEEDED by elogind
3894 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
3895 assert_return(bus, -EINVAL);
3897 return bus->exit_on_disconnect;