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);
113 b->state = BUS_CLOSED;
115 sd_bus_detach_event(b);
117 while ((s = b->slots)) {
118 /* At this point only floating slots can still be
119 * around, because the non-floating ones keep a
120 * reference to the bus, and we thus couldn't be
121 * destructing right now... We forcibly disconnect the
122 * slots here, so that they still can be referenced by
123 * apps, but are dead. */
126 bus_slot_disconnect(s);
127 sd_bus_slot_unref(s);
130 if (b->default_bus_ptr)
131 *b->default_bus_ptr = NULL;
136 munmap(b->kdbus_buffer, KDBUS_POOL_SIZE);
140 free(b->unique_name);
141 free(b->auth_buffer);
146 free(b->cgroup_root);
147 free(b->description);
150 strv_free(b->exec_argv);
152 close_many(b->fds, b->n_fds);
157 ordered_hashmap_free_free(b->reply_callbacks);
158 prioq_free(b->reply_callbacks_prioq);
160 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
161 bus_match_free(&b->match_callbacks);
163 hashmap_free_free(b->vtable_methods);
164 hashmap_free_free(b->vtable_properties);
166 assert(hashmap_isempty(b->nodes));
167 hashmap_free(b->nodes);
169 bus_kernel_flush_memfd(b);
171 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
176 _public_ int sd_bus_new(sd_bus **ret) {
179 assert_return(ret, -EINVAL);
185 r->n_ref = REFCNT_INIT;
186 r->input_fd = r->output_fd = -1;
187 r->message_version = 1;
188 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
189 r->hello_flags |= KDBUS_HELLO_ACCEPT_FD;
190 r->attach_flags |= KDBUS_ATTACH_NAMES;
191 r->original_pid = getpid();
193 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
195 /* We guarantee that wqueue always has space for at least one
197 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
206 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
209 assert_return(bus, -EINVAL);
210 assert_return(bus->state == BUS_UNSET, -EPERM);
211 assert_return(address, -EINVAL);
212 assert_return(!bus_pid_changed(bus), -ECHILD);
224 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
225 assert_return(bus, -EINVAL);
226 assert_return(bus->state == BUS_UNSET, -EPERM);
227 assert_return(input_fd >= 0, -EBADF);
228 assert_return(output_fd >= 0, -EBADF);
229 assert_return(!bus_pid_changed(bus), -ECHILD);
231 bus->input_fd = input_fd;
232 bus->output_fd = output_fd;
236 #if 0 /// UNNEEDED by elogind
237 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
240 assert_return(bus, -EINVAL);
241 assert_return(bus->state == BUS_UNSET, -EPERM);
242 assert_return(path, -EINVAL);
243 assert_return(!strv_isempty(argv), -EINVAL);
244 assert_return(!bus_pid_changed(bus), -ECHILD);
256 free(bus->exec_path);
257 strv_free(bus->exec_argv);
265 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
266 assert_return(bus, -EINVAL);
267 assert_return(bus->state == BUS_UNSET, -EPERM);
268 assert_return(!bus_pid_changed(bus), -ECHILD);
270 bus->bus_client = !!b;
274 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
275 assert_return(bus, -EINVAL);
276 assert_return(bus->state == BUS_UNSET, -EPERM);
277 assert_return(!bus_pid_changed(bus), -ECHILD);
279 SET_FLAG(bus->hello_flags, KDBUS_HELLO_MONITOR, b);
283 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
284 assert_return(bus, -EINVAL);
285 assert_return(bus->state == BUS_UNSET, -EPERM);
286 assert_return(!bus_pid_changed(bus), -ECHILD);
288 SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b);
292 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
294 assert_return(bus, -EINVAL);
295 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
296 assert_return(!bus_pid_changed(bus), -ECHILD);
298 new_flags = bus->attach_flags;
299 SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b);
301 if (bus->attach_flags == new_flags)
304 bus->attach_flags = new_flags;
305 if (bus->state != BUS_UNSET && bus->is_kernel)
306 bus_kernel_realize_attach_flags(bus);
311 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
314 assert_return(bus, -EINVAL);
315 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
316 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
317 assert_return(!bus_pid_changed(bus), -ECHILD);
319 SET_FLAG(bus->creds_mask, mask, b);
321 /* The well knowns we need unconditionally, so that matches can work */
322 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
324 /* Make sure we don't lose the timestamp flag */
325 new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask);
326 if (bus->attach_flags == new_flags)
329 bus->attach_flags = new_flags;
330 if (bus->state != BUS_UNSET && bus->is_kernel)
331 bus_kernel_realize_attach_flags(bus);
336 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
337 assert_return(bus, -EINVAL);
338 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
339 assert_return(bus->state == BUS_UNSET, -EPERM);
340 assert_return(!bus_pid_changed(bus), -ECHILD);
342 bus->is_server = !!b;
343 bus->server_id = server_id;
347 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
348 assert_return(bus, -EINVAL);
349 assert_return(bus->state == BUS_UNSET, -EPERM);
350 assert_return(!bus_pid_changed(bus), -ECHILD);
352 bus->anonymous_auth = !!b;
356 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
357 assert_return(bus, -EINVAL);
358 assert_return(bus->state == BUS_UNSET, -EPERM);
359 assert_return(!bus_pid_changed(bus), -ECHILD);
365 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
366 assert_return(bus, -EINVAL);
367 assert_return(bus->state == BUS_UNSET, -EPERM);
368 assert_return(!bus_pid_changed(bus), -ECHILD);
370 return free_and_strdup(&bus->description, description);
374 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
375 assert_return(bus, -EINVAL);
376 assert_return(!bus_pid_changed(bus), -ECHILD);
378 bus->allow_interactive_authorization = !!b;
382 #if 0 /// UNNEEDED by elogind
383 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
384 assert_return(bus, -EINVAL);
385 assert_return(!bus_pid_changed(bus), -ECHILD);
387 return bus->allow_interactive_authorization;
391 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
399 assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING);
401 r = sd_bus_message_get_errno(reply);
405 r = sd_bus_message_read(reply, "s", &s);
409 if (!service_name_is_valid(s) || s[0] != ':')
412 bus->unique_name = strdup(s);
413 if (!bus->unique_name)
416 if (bus->state == BUS_HELLO)
417 bus->state = BUS_RUNNING;
422 static int bus_send_hello(sd_bus *bus) {
423 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
428 if (!bus->bus_client || bus->is_kernel)
431 r = sd_bus_message_new_method_call(
434 "org.freedesktop.DBus",
435 "/org/freedesktop/DBus",
436 "org.freedesktop.DBus",
441 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
444 int bus_start_running(sd_bus *bus) {
447 if (bus->bus_client && !bus->is_kernel) {
448 bus->state = BUS_HELLO;
452 bus->state = BUS_RUNNING;
456 static int parse_address_key(const char **p, const char *key, char **value) {
457 size_t l, n = 0, allocated = 0;
467 if (strncmp(*p, key, l) != 0)
480 while (*a != ';' && *a != ',' && *a != 0) {
498 c = (char) ((x << 4) | y);
505 if (!GREEDY_REALLOC(r, allocated, n + 2))
529 static void skip_address_key(const char **p) {
533 *p += strcspn(*p, ",");
539 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
540 _cleanup_free_ char *path = NULL, *abstract = NULL;
549 while (**p != 0 && **p != ';') {
550 r = parse_address_key(p, "guid", guid);
556 r = parse_address_key(p, "path", &path);
562 r = parse_address_key(p, "abstract", &abstract);
571 if (!path && !abstract)
574 if (path && abstract)
579 if (l > sizeof(b->sockaddr.un.sun_path))
582 b->sockaddr.un.sun_family = AF_UNIX;
583 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
584 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
585 } else if (abstract) {
586 l = strlen(abstract);
587 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
590 b->sockaddr.un.sun_family = AF_UNIX;
591 b->sockaddr.un.sun_path[0] = 0;
592 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
593 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
599 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
600 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
602 struct addrinfo *result, hints = {
603 .ai_socktype = SOCK_STREAM,
604 .ai_flags = AI_ADDRCONFIG,
612 while (**p != 0 && **p != ';') {
613 r = parse_address_key(p, "guid", guid);
619 r = parse_address_key(p, "host", &host);
625 r = parse_address_key(p, "port", &port);
631 r = parse_address_key(p, "family", &family);
644 if (streq(family, "ipv4"))
645 hints.ai_family = AF_INET;
646 else if (streq(family, "ipv6"))
647 hints.ai_family = AF_INET6;
652 r = getaddrinfo(host, port, &hints, &result);
656 return -EADDRNOTAVAIL;
658 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
659 b->sockaddr_size = result->ai_addrlen;
661 freeaddrinfo(result);
666 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
668 unsigned n_argv = 0, j;
670 size_t allocated = 0;
678 while (**p != 0 && **p != ';') {
679 r = parse_address_key(p, "guid", guid);
685 r = parse_address_key(p, "path", &path);
691 if (startswith(*p, "argv")) {
695 ul = strtoul(*p + 4, (char**) p, 10);
696 if (errno > 0 || **p != '=' || ul > 256) {
704 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
712 r = parse_address_key(p, NULL, argv + ul);
727 /* Make sure there are no holes in the array, with the
728 * exception of argv[0] */
729 for (j = 1; j < n_argv; j++)
735 if (argv && argv[0] == NULL) {
736 argv[0] = strdup(path);
748 for (j = 0; j < n_argv; j++)
756 static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
757 _cleanup_free_ char *path = NULL;
765 while (**p != 0 && **p != ';') {
766 r = parse_address_key(p, "guid", guid);
772 r = parse_address_key(p, "path", &path);
791 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
792 _cleanup_free_ char *machine = NULL, *pid = NULL;
800 while (**p != 0 && **p != ';') {
801 r = parse_address_key(p, "guid", guid);
807 r = parse_address_key(p, "machine", &machine);
813 r = parse_address_key(p, "pid", &pid);
822 if (!machine == !pid)
826 if (!machine_name_is_valid(machine))
830 b->machine = machine;
833 b->machine = mfree(b->machine);
837 r = parse_pid(pid, &b->nspid);
843 b->sockaddr.un.sun_family = AF_UNIX;
844 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
845 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
850 static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) {
851 _cleanup_free_ char *machine = NULL, *pid = NULL;
859 while (**p != 0 && **p != ';') {
860 r = parse_address_key(p, "guid", guid);
866 r = parse_address_key(p, "machine", &machine);
872 r = parse_address_key(p, "pid", &pid);
881 if (!machine == !pid)
885 if (!machine_name_is_valid(machine))
889 b->machine = machine;
892 b->machine = mfree(b->machine);
896 r = parse_pid(pid, &b->nspid);
902 r = free_and_strdup(&b->kernel, "/sys/fs/kdbus/0-system/bus");
909 static void bus_reset_parsed_address(sd_bus *b) {
913 b->sockaddr_size = 0;
914 b->exec_argv = strv_free(b->exec_argv);
915 b->exec_path = mfree(b->exec_path);
916 b->server_id = SD_ID128_NULL;
917 b->kernel = mfree(b->kernel);
918 b->machine = mfree(b->machine);
922 static int bus_parse_next_address(sd_bus *b) {
923 _cleanup_free_ char *guid = NULL;
931 if (b->address[b->address_index] == 0)
934 bus_reset_parsed_address(b);
936 a = b->address + b->address_index;
945 if (startswith(a, "unix:")) {
948 r = parse_unix_address(b, &a, &guid);
953 } else if (startswith(a, "tcp:")) {
956 r = parse_tcp_address(b, &a, &guid);
962 } else if (startswith(a, "unixexec:")) {
965 r = parse_exec_address(b, &a, &guid);
971 } else if (startswith(a, "kernel:")) {
974 r = parse_kernel_address(b, &a, &guid);
979 } else if (startswith(a, "x-machine-unix:")) {
982 r = parse_container_unix_address(b, &a, &guid);
987 } else if (startswith(a, "x-machine-kernel:")) {
990 r = parse_container_kernel_address(b, &a, &guid);
1003 r = sd_id128_from_string(guid, &b->server_id);
1008 b->address_index = a - b->address;
1012 static int bus_start_address(sd_bus *b) {
1013 bool container_kdbus_available = false;
1014 bool kdbus_available = false;
1020 bool skipped = false;
1025 * Usually, if you provide multiple different bus-addresses, we
1026 * try all of them in order. We use the first one that
1027 * succeeds. However, if you mix kernel and unix addresses, we
1028 * never try unix-addresses if a previous kernel address was
1029 * tried and kdbus was available. This is required to prevent
1030 * clients to fallback to the bus-proxy if kdbus is available
1031 * but failed (eg., too many connections).
1035 r = bus_socket_exec(b);
1036 else if ((b->nspid > 0 || b->machine) && b->kernel) {
1037 r = bus_container_connect_kernel(b);
1038 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1039 container_kdbus_available = true;
1041 } else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC) {
1042 if (!container_kdbus_available)
1043 r = bus_container_connect_socket(b);
1047 } else if (b->kernel) {
1048 r = bus_kernel_connect(b);
1049 if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
1050 kdbus_available = true;
1052 } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
1053 if (!kdbus_available)
1054 r = bus_socket_connect(b);
1062 r = attach_io_events(b);
1067 b->last_connect_error = -r;
1070 r = bus_parse_next_address(b);
1074 return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
1078 int bus_next_address(sd_bus *b) {
1081 bus_reset_parsed_address(b);
1082 return bus_start_address(b);
1085 static int bus_start_fd(sd_bus *b) {
1090 assert(b->input_fd >= 0);
1091 assert(b->output_fd >= 0);
1093 r = fd_nonblock(b->input_fd, true);
1097 r = fd_cloexec(b->input_fd, true);
1101 if (b->input_fd != b->output_fd) {
1102 r = fd_nonblock(b->output_fd, true);
1106 r = fd_cloexec(b->output_fd, true);
1111 if (fstat(b->input_fd, &st) < 0)
1114 if (S_ISCHR(b->input_fd))
1115 return bus_kernel_take_fd(b);
1117 return bus_socket_take_fd(b);
1120 _public_ int sd_bus_start(sd_bus *bus) {
1123 assert_return(bus, -EINVAL);
1124 assert_return(bus->state == BUS_UNSET, -EPERM);
1125 assert_return(!bus_pid_changed(bus), -ECHILD);
1127 bus->state = BUS_OPENING;
1129 if (bus->is_server && bus->bus_client)
1132 if (bus->input_fd >= 0)
1133 r = bus_start_fd(bus);
1134 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
1135 r = bus_start_address(bus);
1144 return bus_send_hello(bus);
1147 _public_ int sd_bus_open(sd_bus **ret) {
1152 assert_return(ret, -EINVAL);
1154 /* Let's connect to the starter bus if it is set, and
1155 * otherwise to the bus that is appropropriate for the scope
1156 * we are running in */
1158 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1160 if (streq(e, "system"))
1161 return sd_bus_open_system(ret);
1162 #if 0 /// elogind does not support systemd units
1163 else if (STR_IN_SET(e, "session", "user"))
1164 return sd_bus_open_user(ret);
1168 e = secure_getenv("DBUS_STARTER_ADDRESS");
1170 #if 0 /// elogind does not support systemd units
1171 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1172 return sd_bus_open_user(ret);
1175 return sd_bus_open_system(ret);
1182 r = sd_bus_set_address(b, e);
1186 b->bus_client = true;
1188 /* We don't know whether the bus is trusted or not, so better
1189 * be safe, and authenticate everything */
1191 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1192 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1194 r = sd_bus_start(b);
1206 int bus_set_address_system(sd_bus *b) {
1210 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1212 return sd_bus_set_address(b, e);
1214 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1217 _public_ int sd_bus_open_system(sd_bus **ret) {
1221 assert_return(ret, -EINVAL);
1227 r = bus_set_address_system(b);
1231 b->bus_client = true;
1232 b->is_system = true;
1234 /* Let's do per-method access control on the system bus. We
1235 * need the caller's UID and capability set for that. */
1237 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1238 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1240 r = sd_bus_start(b);
1252 #if 0 /// elogind can not open/use a user bus
1253 int bus_set_address_user(sd_bus *b) {
1260 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1262 return sd_bus_set_address(b, e);
1264 r = cg_pid_get_owner_uid(0, &uid);
1268 e = secure_getenv("XDG_RUNTIME_DIR");
1270 _cleanup_free_ char *ee = NULL;
1272 ee = bus_address_escape(e);
1276 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, ee);
1278 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, uid);
1287 _public_ int sd_bus_open_user(sd_bus **ret) {
1288 #if 0 /// elogind does not support user buses
1292 assert_return(ret, -EINVAL);
1298 r = bus_set_address_user(b);
1302 b->bus_client = true;
1305 /* We don't do any per-method access control on the user
1309 r = sd_bus_start(b);
1320 return sd_bus_open_system(ret);
1324 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1325 _cleanup_free_ char *e = NULL;
1326 char *m = NULL, *c = NULL;
1331 /* Let's see if we shall enter some container */
1332 m = strchr(host, ':');
1336 /* Let's make sure this is not a port of some kind,
1337 * and is a valid machine name. */
1338 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1341 /* Cut out the host part */
1342 t = strndupa(host, m - host - 1);
1343 e = bus_address_escape(t);
1347 c = strjoina(",argv4=--machine=", m);
1352 e = bus_address_escape(host);
1357 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", c, NULL);
1364 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1368 assert_return(host, -EINVAL);
1369 assert_return(ret, -EINVAL);
1371 r = sd_bus_new(&bus);
1375 r = bus_set_address_system_remote(bus, host);
1379 bus->bus_client = true;
1380 bus->trusted = false;
1381 bus->is_system = true;
1383 r = sd_bus_start(bus);
1395 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1396 _cleanup_free_ char *e = NULL;
1401 e = bus_address_escape(machine);
1405 b->address = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
1412 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1416 assert_return(machine, -EINVAL);
1417 assert_return(ret, -EINVAL);
1418 assert_return(machine_name_is_valid(machine), -EINVAL);
1420 r = sd_bus_new(&bus);
1424 r = bus_set_address_system_machine(bus, machine);
1428 bus->bus_client = true;
1429 bus->trusted = false;
1430 bus->is_system = true;
1432 r = sd_bus_start(bus);
1444 _public_ void sd_bus_close(sd_bus *bus) {
1448 if (bus->state == BUS_CLOSED)
1450 if (bus_pid_changed(bus))
1453 bus->state = BUS_CLOSED;
1455 sd_bus_detach_event(bus);
1457 /* Drop all queued messages so that they drop references to
1458 * the bus object and the bus may be freed */
1459 bus_reset_queues(bus);
1461 if (!bus->is_kernel)
1464 /* We'll leave the fd open in case this is a kernel bus, since
1465 * there might still be memblocks around that reference this
1466 * bus, and they might need to invoke the KDBUS_CMD_FREE
1467 * ioctl on the fd when they are freed. */
1470 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1478 return sd_bus_unref(bus);
1481 static void bus_enter_closing(sd_bus *bus) {
1484 if (bus->state != BUS_OPENING &&
1485 bus->state != BUS_AUTHENTICATING &&
1486 bus->state != BUS_HELLO &&
1487 bus->state != BUS_RUNNING)
1490 bus->state = BUS_CLOSING;
1493 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1498 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1503 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1509 i = REFCNT_DEC(bus->n_ref);
1517 #if 0 /// UNNEEDED by elogind
1518 _public_ int sd_bus_is_open(sd_bus *bus) {
1520 assert_return(bus, -EINVAL);
1521 assert_return(!bus_pid_changed(bus), -ECHILD);
1523 return BUS_IS_OPEN(bus->state);
1527 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1530 assert_return(bus, -EINVAL);
1531 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1532 assert_return(!bus_pid_changed(bus), -ECHILD);
1534 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1537 if (type == SD_BUS_TYPE_UNIX_FD) {
1538 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1541 r = bus_ensure_running(bus);
1545 return bus->can_fds;
1548 return bus_type_is_valid(type);
1551 #if 0 /// UNNEEDED by elogind
1552 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1555 assert_return(bus, -EINVAL);
1556 assert_return(id, -EINVAL);
1557 assert_return(!bus_pid_changed(bus), -ECHILD);
1559 r = bus_ensure_running(bus);
1563 *id = bus->server_id;
1568 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1573 /* If we copy the same message to multiple
1574 * destinations, avoid using the same cookie
1576 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1581 timeout = BUS_DEFAULT_TIMEOUT;
1583 return bus_message_seal(m, ++b->cookie, timeout);
1586 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1587 bool remarshal = false;
1591 /* wrong packet version */
1592 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1595 /* wrong packet endianness */
1596 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1599 /* TODO: kdbus-messages received from the kernel contain data which is
1600 * not allowed to be passed to KDBUS_CMD_SEND. Therefore, we have to
1601 * force remarshaling of the message. Technically, we could just
1602 * recreate the kdbus message, but that is non-trivial as other parts of
1603 * the message refer to m->kdbus already. This should be fixed! */
1604 if ((*m)->kdbus && (*m)->release_kdbus)
1607 return remarshal ? bus_message_remarshal(b, m) : 0;
1610 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1614 /* Fake some timestamps, if they were requested, and not
1615 * already initialized */
1616 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1617 if (m->realtime <= 0)
1618 m->realtime = now(CLOCK_REALTIME);
1620 if (m->monotonic <= 0)
1621 m->monotonic = now(CLOCK_MONOTONIC);
1624 /* The bus specification says the serial number cannot be 0,
1625 * hence let's fill something in for synthetic messages. Since
1626 * synthetic messages might have a fake sender and we don't
1627 * want to interfere with the real sender's serial numbers we
1628 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1629 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1630 * even though kdbus can do 64bit. */
1631 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1634 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1641 r = bus_kernel_write_message(bus, m, hint_sync_call);
1643 r = bus_socket_write_message(bus, m, idx);
1648 if (bus->is_kernel || *idx >= BUS_MESSAGE_SIZE(m))
1649 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s",
1650 bus_message_type_to_string(m->header->type),
1651 strna(sd_bus_message_get_sender(m)),
1652 strna(sd_bus_message_get_destination(m)),
1653 strna(sd_bus_message_get_path(m)),
1654 strna(sd_bus_message_get_interface(m)),
1655 strna(sd_bus_message_get_member(m)),
1656 BUS_MESSAGE_COOKIE(m),
1658 strna(m->error.message));
1663 static int dispatch_wqueue(sd_bus *bus) {
1667 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1669 while (bus->wqueue_size > 0) {
1671 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1675 /* Didn't do anything this time */
1677 else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1678 /* Fully written. Let's drop the entry from
1681 * This isn't particularly optimized, but
1682 * well, this is supposed to be our worst-case
1683 * buffer only, and the socket buffer is
1684 * supposed to be our primary buffer, and if
1685 * it got full, then all bets are off
1689 sd_bus_message_unref(bus->wqueue[0]);
1690 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1700 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1704 return bus_kernel_read_message(bus, hint_priority, priority);
1706 return bus_socket_read_message(bus);
1709 int bus_rqueue_make_room(sd_bus *bus) {
1712 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1715 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1721 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1726 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1728 /* Note that the priority logic is only available on kdbus,
1729 * where the rqueue is unused. We check the rqueue here
1730 * anyway, because it's simple... */
1733 if (bus->rqueue_size > 0) {
1734 /* Dispatch a queued message */
1736 *m = bus->rqueue[0];
1738 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1742 /* Try to read a new message */
1743 r = bus_read_message(bus, hint_priority, priority);
1753 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1754 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1757 assert_return(m, -EINVAL);
1762 assert_return(!bus_pid_changed(bus), -ECHILD);
1763 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1765 if (!BUS_IS_OPEN(bus->state))
1769 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1776 /* If the cookie number isn't kept, then we know that no reply
1778 if (!cookie && !m->sealed)
1779 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1781 r = bus_seal_message(bus, m, 0);
1785 /* Remarshall if we have to. This will possibly unref the
1786 * message and place a replacement in m */
1787 r = bus_remarshal_message(bus, &m);
1791 /* If this is a reply and no reply was requested, then let's
1792 * suppress this, if we can */
1796 if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
1799 r = bus_write_message(bus, m, hint_sync_call, &idx);
1801 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1802 bus_enter_closing(bus);
1809 if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) {
1810 /* Wasn't fully written. So let's remember how
1811 * much was written. Note that the first entry
1812 * of the wqueue array is always allocated so
1813 * that we always can remember how much was
1815 bus->wqueue[0] = sd_bus_message_ref(m);
1816 bus->wqueue_size = 1;
1821 /* Just append it to the queue. */
1823 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1826 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1829 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1834 *cookie = BUS_MESSAGE_COOKIE(m);
1839 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1840 return bus_send_internal(bus, m, cookie, false);
1843 #if 0 /// UNNEEDED by elogind
1844 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1847 assert_return(m, -EINVAL);
1852 assert_return(!bus_pid_changed(bus), -ECHILD);
1854 if (!BUS_IS_OPEN(bus->state))
1857 if (!streq_ptr(m->destination, destination)) {
1862 r = sd_bus_message_set_destination(m, destination);
1867 return sd_bus_send(bus, m, cookie);
1871 static usec_t calc_elapse(uint64_t usec) {
1872 if (usec == (uint64_t) -1)
1875 return now(CLOCK_MONOTONIC) + usec;
1878 static int timeout_compare(const void *a, const void *b) {
1879 const struct reply_callback *x = a, *y = b;
1881 if (x->timeout != 0 && y->timeout == 0)
1884 if (x->timeout == 0 && y->timeout != 0)
1887 if (x->timeout < y->timeout)
1890 if (x->timeout > y->timeout)
1896 _public_ int sd_bus_call_async(
1900 sd_bus_message_handler_t callback,
1904 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1905 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1908 assert_return(m, -EINVAL);
1909 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1910 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1911 assert_return(callback, -EINVAL);
1916 assert_return(!bus_pid_changed(bus), -ECHILD);
1917 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1919 if (!BUS_IS_OPEN(bus->state))
1922 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1926 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1930 r = bus_seal_message(bus, m, usec);
1934 r = bus_remarshal_message(bus, &m);
1938 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1942 s->reply_callback.callback = callback;
1944 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1945 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1947 s->reply_callback.cookie = 0;
1951 s->reply_callback.timeout = calc_elapse(m->timeout);
1952 if (s->reply_callback.timeout != 0) {
1953 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1955 s->reply_callback.timeout = 0;
1960 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1971 int bus_ensure_running(sd_bus *bus) {
1976 if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING)
1978 if (bus->state == BUS_RUNNING)
1982 r = sd_bus_process(bus, NULL);
1985 if (bus->state == BUS_RUNNING)
1990 r = sd_bus_wait(bus, (uint64_t) -1);
1996 _public_ int sd_bus_call(
2000 sd_bus_error *error,
2001 sd_bus_message **reply) {
2003 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2009 bus_assert_return(m, -EINVAL, error);
2010 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2011 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2012 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2017 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2018 bus_assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS, error);
2020 if (!BUS_IS_OPEN(bus->state)) {
2025 r = bus_ensure_running(bus);
2029 i = bus->rqueue_size;
2031 r = bus_seal_message(bus, m, usec);
2035 r = bus_remarshal_message(bus, &m);
2039 r = bus_send_internal(bus, m, &cookie, true);
2043 timeout = calc_elapse(m->timeout);
2048 while (i < bus->rqueue_size) {
2049 sd_bus_message *incoming = NULL;
2051 incoming = bus->rqueue[i];
2053 if (incoming->reply_cookie == cookie) {
2054 /* Found a match! */
2056 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2058 log_debug_bus_message(incoming);
2060 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2062 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2066 sd_bus_message_unref(incoming);
2071 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2072 sd_bus_message_unref(incoming);
2075 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2076 r = sd_bus_error_copy(error, &incoming->error);
2077 sd_bus_message_unref(incoming);
2084 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2087 streq(bus->unique_name, incoming->sender)) {
2089 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2092 /* Our own message? Somebody is trying
2093 * to send its own client a message,
2094 * let's not dead-lock, let's fail
2097 sd_bus_message_unref(incoming);
2102 /* Try to read more, right-away */
2106 r = bus_read_message(bus, false, 0);
2108 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2109 bus_enter_closing(bus);
2121 n = now(CLOCK_MONOTONIC);
2129 left = (uint64_t) -1;
2131 r = bus_poll(bus, true, left);
2139 r = dispatch_wqueue(bus);
2141 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2142 bus_enter_closing(bus);
2151 return sd_bus_error_set_errno(error, r);
2154 #if 0 /// UNNEEDED by elogind
2155 _public_ int sd_bus_get_fd(sd_bus *bus) {
2157 assert_return(bus, -EINVAL);
2158 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2159 assert_return(!bus_pid_changed(bus), -ECHILD);
2161 return bus->input_fd;
2165 _public_ int sd_bus_get_events(sd_bus *bus) {
2168 assert_return(bus, -EINVAL);
2169 assert_return(!bus_pid_changed(bus), -ECHILD);
2171 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2174 if (bus->state == BUS_OPENING)
2176 else if (bus->state == BUS_AUTHENTICATING) {
2178 if (bus_socket_auth_needs_write(bus))
2183 } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
2184 if (bus->rqueue_size <= 0)
2186 if (bus->wqueue_size > 0)
2193 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2194 struct reply_callback *c;
2196 assert_return(bus, -EINVAL);
2197 assert_return(timeout_usec, -EINVAL);
2198 assert_return(!bus_pid_changed(bus), -ECHILD);
2200 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2203 if (bus->track_queue) {
2208 if (bus->state == BUS_CLOSING) {
2213 if (bus->state == BUS_AUTHENTICATING) {
2214 *timeout_usec = bus->auth_timeout;
2218 if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) {
2219 *timeout_usec = (uint64_t) -1;
2223 if (bus->rqueue_size > 0) {
2228 c = prioq_peek(bus->reply_callbacks_prioq);
2230 *timeout_usec = (uint64_t) -1;
2234 if (c->timeout == 0) {
2235 *timeout_usec = (uint64_t) -1;
2239 *timeout_usec = c->timeout;
2243 static int process_timeout(sd_bus *bus) {
2244 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2245 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2246 struct reply_callback *c;
2253 c = prioq_peek(bus->reply_callbacks_prioq);
2257 n = now(CLOCK_MONOTONIC);
2261 r = bus_message_new_synthetic_error(
2264 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2269 r = bus_seal_synthetic_message(bus, m);
2273 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2276 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2279 slot = container_of(c, sd_bus_slot, reply_callback);
2281 bus->iteration_counter++;
2283 bus->current_message = m;
2284 bus->current_slot = sd_bus_slot_ref(slot);
2285 bus->current_handler = c->callback;
2286 bus->current_userdata = slot->userdata;
2287 r = c->callback(m, slot->userdata, &error_buffer);
2288 bus->current_userdata = NULL;
2289 bus->current_handler = NULL;
2290 bus->current_slot = NULL;
2291 bus->current_message = NULL;
2293 if (slot->floating) {
2294 bus_slot_disconnect(slot);
2295 sd_bus_slot_unref(slot);
2298 sd_bus_slot_unref(slot);
2300 return bus_maybe_reply_error(m, r, &error_buffer);
2303 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2307 if (bus->state != BUS_HELLO)
2310 /* Let's make sure the first message on the bus is the HELLO
2311 * reply. But note that we don't actually parse the message
2312 * here (we leave that to the usual handling), we just verify
2313 * we don't let any earlier msg through. */
2315 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2316 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2319 if (m->reply_cookie != 1)
2325 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2326 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2327 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2328 struct reply_callback *c;
2335 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2336 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2339 if (bus->is_kernel && (bus->hello_flags & KDBUS_HELLO_MONITOR))
2342 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2345 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2351 slot = container_of(c, sd_bus_slot, reply_callback);
2353 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2355 /* If the reply contained a file descriptor which we
2356 * didn't want we pass an error instead. */
2358 r = bus_message_new_synthetic_error(
2361 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2366 /* Copy over original timestamp */
2367 synthetic_reply->realtime = m->realtime;
2368 synthetic_reply->monotonic = m->monotonic;
2369 synthetic_reply->seqnum = m->seqnum;
2371 r = bus_seal_synthetic_message(bus, synthetic_reply);
2375 m = synthetic_reply;
2377 r = sd_bus_message_rewind(m, true);
2382 if (c->timeout != 0) {
2383 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2387 bus->current_slot = sd_bus_slot_ref(slot);
2388 bus->current_handler = c->callback;
2389 bus->current_userdata = slot->userdata;
2390 r = c->callback(m, slot->userdata, &error_buffer);
2391 bus->current_userdata = NULL;
2392 bus->current_handler = NULL;
2393 bus->current_slot = NULL;
2395 if (slot->floating) {
2396 bus_slot_disconnect(slot);
2397 sd_bus_slot_unref(slot);
2400 sd_bus_slot_unref(slot);
2402 return bus_maybe_reply_error(m, r, &error_buffer);
2405 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2406 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2407 struct filter_callback *l;
2414 bus->filter_callbacks_modified = false;
2416 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2419 if (bus->filter_callbacks_modified)
2422 /* Don't run this more than once per iteration */
2423 if (l->last_iteration == bus->iteration_counter)
2426 l->last_iteration = bus->iteration_counter;
2428 r = sd_bus_message_rewind(m, true);
2432 slot = container_of(l, sd_bus_slot, filter_callback);
2434 bus->current_slot = sd_bus_slot_ref(slot);
2435 bus->current_handler = l->callback;
2436 bus->current_userdata = slot->userdata;
2437 r = l->callback(m, slot->userdata, &error_buffer);
2438 bus->current_userdata = NULL;
2439 bus->current_handler = NULL;
2440 bus->current_slot = sd_bus_slot_unref(slot);
2442 r = bus_maybe_reply_error(m, r, &error_buffer);
2448 } while (bus->filter_callbacks_modified);
2453 static int process_match(sd_bus *bus, sd_bus_message *m) {
2460 bus->match_callbacks_modified = false;
2462 r = bus_match_run(bus, &bus->match_callbacks, m);
2466 } while (bus->match_callbacks_modified);
2471 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2472 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2478 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2481 if (bus->manual_peer_interface)
2484 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2487 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2490 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2493 if (streq_ptr(m->member, "Ping"))
2494 r = sd_bus_message_new_method_return(m, &reply);
2495 else if (streq_ptr(m->member, "GetMachineId")) {
2499 r = sd_id128_get_machine(&id);
2503 r = sd_bus_message_new_method_return(m, &reply);
2507 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2509 r = sd_bus_message_new_method_errorf(
2511 SD_BUS_ERROR_UNKNOWN_METHOD,
2512 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2518 r = sd_bus_send(bus, reply, NULL);
2525 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2529 /* If we got a message with a file descriptor which we didn't
2530 * want to accept, then let's drop it. How can this even
2531 * happen? For example, when the kernel queues a message into
2532 * an activatable names's queue which allows fds, and then is
2533 * delivered to us later even though we ourselves did not
2536 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2542 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2545 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2546 return 1; /* just eat it up */
2548 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2551 static int process_message(sd_bus *bus, sd_bus_message *m) {
2557 bus->current_message = m;
2558 bus->iteration_counter++;
2560 log_debug_bus_message(m);
2562 r = process_hello(bus, m);
2566 r = process_reply(bus, m);
2570 r = process_fd_check(bus, m);
2574 r = process_filter(bus, m);
2578 r = process_match(bus, m);
2582 r = process_builtin(bus, m);
2586 r = bus_process_object(bus, m);
2589 bus->current_message = NULL;
2593 static int dispatch_track(sd_bus *bus) {
2596 if (!bus->track_queue)
2599 bus_track_dispatch(bus->track_queue);
2603 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2604 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2608 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
2610 r = process_timeout(bus);
2614 r = dispatch_wqueue(bus);
2618 r = dispatch_track(bus);
2622 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2628 r = process_message(bus, m);
2633 r = sd_bus_message_rewind(m, true);
2642 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2644 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2645 strna(sd_bus_message_get_sender(m)),
2646 strna(sd_bus_message_get_path(m)),
2647 strna(sd_bus_message_get_interface(m)),
2648 strna(sd_bus_message_get_member(m)));
2650 r = sd_bus_reply_method_errorf(
2652 SD_BUS_ERROR_UNKNOWN_OBJECT,
2653 "Unknown object '%s'.", m->path);
2667 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2668 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2669 struct reply_callback *c;
2673 assert(bus->state == BUS_CLOSING);
2675 c = ordered_hashmap_first(bus->reply_callbacks);
2677 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2680 /* First, fail all outstanding method calls */
2681 r = bus_message_new_synthetic_error(
2684 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2689 r = bus_seal_synthetic_message(bus, m);
2693 if (c->timeout != 0) {
2694 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2698 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2701 slot = container_of(c, sd_bus_slot, reply_callback);
2703 bus->iteration_counter++;
2705 bus->current_message = m;
2706 bus->current_slot = sd_bus_slot_ref(slot);
2707 bus->current_handler = c->callback;
2708 bus->current_userdata = slot->userdata;
2709 r = c->callback(m, slot->userdata, &error_buffer);
2710 bus->current_userdata = NULL;
2711 bus->current_handler = NULL;
2712 bus->current_slot = NULL;
2713 bus->current_message = NULL;
2715 if (slot->floating) {
2716 bus_slot_disconnect(slot);
2717 sd_bus_slot_unref(slot);
2720 sd_bus_slot_unref(slot);
2722 return bus_maybe_reply_error(m, r, &error_buffer);
2725 /* Then, synthesize a Disconnected message */
2726 r = sd_bus_message_new_signal(
2729 "/org/freedesktop/DBus/Local",
2730 "org.freedesktop.DBus.Local",
2735 bus_message_set_sender_local(bus, m);
2737 r = bus_seal_synthetic_message(bus, m);
2743 bus->current_message = m;
2744 bus->iteration_counter++;
2746 r = process_filter(bus, m);
2750 r = process_match(bus, m);
2762 bus->current_message = NULL;
2767 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2768 BUS_DONT_DESTROY(bus);
2771 /* Returns 0 when we didn't do anything. This should cause the
2772 * caller to invoke sd_bus_wait() before returning the next
2773 * time. Returns > 0 when we did something, which possibly
2774 * means *ret is filled in with an unprocessed message. */
2776 assert_return(bus, -EINVAL);
2777 assert_return(!bus_pid_changed(bus), -ECHILD);
2779 /* We don't allow recursively invoking sd_bus_process(). */
2780 assert_return(!bus->current_message, -EBUSY);
2781 assert(!bus->current_slot);
2783 switch (bus->state) {
2792 r = bus_socket_process_opening(bus);
2793 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2794 bus_enter_closing(bus);
2802 case BUS_AUTHENTICATING:
2803 r = bus_socket_process_authenticating(bus);
2804 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2805 bus_enter_closing(bus);
2817 r = process_running(bus, hint_priority, priority, ret);
2818 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2819 bus_enter_closing(bus);
2829 return process_closing(bus, ret);
2832 assert_not_reached("Unknown state");
2835 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2836 return bus_process_internal(bus, false, 0, ret);
2839 #if 0 /// UNNEEDED by elogind
2840 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2841 return bus_process_internal(bus, true, priority, ret);
2845 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2846 struct pollfd p[2] = {};
2849 usec_t m = USEC_INFINITY;
2853 if (bus->state == BUS_CLOSING)
2856 if (!BUS_IS_OPEN(bus->state))
2859 e = sd_bus_get_events(bus);
2864 /* The caller really needs some more data, he doesn't
2865 * care about what's already read, or any timeouts
2866 * except its own. */
2870 /* The caller wants to process if there's something to
2871 * process, but doesn't care otherwise */
2873 r = sd_bus_get_timeout(bus, &until);
2878 nw = now(CLOCK_MONOTONIC);
2879 m = until > nw ? until - nw : 0;
2883 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2886 p[0].fd = bus->input_fd;
2887 if (bus->output_fd == bus->input_fd) {
2891 p[0].events = e & POLLIN;
2892 p[1].fd = bus->output_fd;
2893 p[1].events = e & POLLOUT;
2897 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2901 return r > 0 ? 1 : 0;
2904 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2906 assert_return(bus, -EINVAL);
2907 assert_return(!bus_pid_changed(bus), -ECHILD);
2909 if (bus->state == BUS_CLOSING)
2912 if (!BUS_IS_OPEN(bus->state))
2915 if (bus->rqueue_size > 0)
2918 return bus_poll(bus, false, timeout_usec);
2921 _public_ int sd_bus_flush(sd_bus *bus) {
2924 assert_return(bus, -EINVAL);
2925 assert_return(!bus_pid_changed(bus), -ECHILD);
2927 if (bus->state == BUS_CLOSING)
2930 if (!BUS_IS_OPEN(bus->state))
2933 r = bus_ensure_running(bus);
2937 if (bus->wqueue_size <= 0)
2941 r = dispatch_wqueue(bus);
2943 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2944 bus_enter_closing(bus);
2951 if (bus->wqueue_size <= 0)
2954 r = bus_poll(bus, false, (uint64_t) -1);
2960 #if 0 /// UNNEEDED by elogind
2961 _public_ int sd_bus_add_filter(
2964 sd_bus_message_handler_t callback,
2969 assert_return(bus, -EINVAL);
2970 assert_return(callback, -EINVAL);
2971 assert_return(!bus_pid_changed(bus), -ECHILD);
2973 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
2977 s->filter_callback.callback = callback;
2979 bus->filter_callbacks_modified = true;
2980 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
2989 _public_ int sd_bus_add_match(
2993 sd_bus_message_handler_t callback,
2996 struct bus_match_component *components = NULL;
2997 unsigned n_components = 0;
2998 sd_bus_slot *s = NULL;
3001 assert_return(bus, -EINVAL);
3002 assert_return(match, -EINVAL);
3003 assert_return(!bus_pid_changed(bus), -ECHILD);
3005 r = bus_match_parse(match, &components, &n_components);
3009 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3015 s->match_callback.callback = callback;
3016 s->match_callback.cookie = ++bus->match_cookie;
3018 if (bus->bus_client) {
3019 enum bus_match_scope scope;
3021 scope = bus_match_get_scope(components, n_components);
3023 /* Do not install server-side matches for matches
3024 * against the local service, interface or bus
3026 if (scope != BUS_MATCH_LOCAL) {
3028 if (!bus->is_kernel) {
3029 /* When this is not a kernel transport, we
3030 * store the original match string, so that we
3031 * can use it to remove the match again */
3033 s->match_callback.match_string = strdup(match);
3034 if (!s->match_callback.match_string) {
3040 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components, s->match_callback.cookie);
3044 s->match_added = true;
3048 bus->match_callbacks_modified = true;
3049 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3058 bus_match_parse_free(components, n_components);
3059 sd_bus_slot_unref(s);
3064 #if 0 /// UNNEEDED by elogind
3065 int bus_remove_match_by_string(
3068 sd_bus_message_handler_t callback,
3071 struct bus_match_component *components = NULL;
3072 unsigned n_components = 0;
3073 struct match_callback *c;
3076 assert_return(bus, -EINVAL);
3077 assert_return(match, -EINVAL);
3078 assert_return(!bus_pid_changed(bus), -ECHILD);
3080 r = bus_match_parse(match, &components, &n_components);
3084 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
3088 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
3091 bus_match_parse_free(components, n_components);
3097 bool bus_pid_changed(sd_bus *bus) {
3100 /* We don't support people creating a bus connection and
3101 * keeping it around over a fork(). Let's complain. */
3103 return bus->original_pid != getpid();
3106 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3107 sd_bus *bus = userdata;
3112 r = sd_bus_process(bus, NULL);
3119 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3120 sd_bus *bus = userdata;
3125 r = sd_bus_process(bus, NULL);
3132 static int prepare_callback(sd_event_source *s, void *userdata) {
3133 sd_bus *bus = userdata;
3140 e = sd_bus_get_events(bus);
3144 if (bus->output_fd != bus->input_fd) {
3146 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3150 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3154 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3159 r = sd_bus_get_timeout(bus, &until);
3165 j = sd_event_source_set_time(bus->time_event_source, until);
3170 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3177 static int quit_callback(sd_event_source *event, void *userdata) {
3178 sd_bus *bus = userdata;
3188 static int attach_io_events(sd_bus *bus) {
3193 if (bus->input_fd < 0)
3199 if (!bus->input_io_event_source) {
3200 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3204 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3208 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3212 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3214 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3219 if (bus->output_fd != bus->input_fd) {
3220 assert(bus->output_fd >= 0);
3222 if (!bus->output_io_event_source) {
3223 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3227 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3231 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3233 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3242 static void detach_io_events(sd_bus *bus) {
3245 if (bus->input_io_event_source) {
3246 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3247 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3250 if (bus->output_io_event_source) {
3251 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3252 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3256 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3259 assert_return(bus, -EINVAL);
3260 assert_return(!bus->event, -EBUSY);
3262 assert(!bus->input_io_event_source);
3263 assert(!bus->output_io_event_source);
3264 assert(!bus->time_event_source);
3267 bus->event = sd_event_ref(event);
3269 r = sd_event_default(&bus->event);
3274 bus->event_priority = priority;
3276 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3280 r = sd_event_source_set_priority(bus->time_event_source, priority);
3284 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3288 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3292 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3296 r = attach_io_events(bus);
3303 sd_bus_detach_event(bus);
3307 _public_ int sd_bus_detach_event(sd_bus *bus) {
3308 assert_return(bus, -EINVAL);
3313 detach_io_events(bus);
3315 if (bus->time_event_source) {
3316 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3317 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3320 if (bus->quit_event_source) {
3321 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3322 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3325 bus->event = sd_event_unref(bus->event);
3329 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3330 assert_return(bus, NULL);
3335 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3336 assert_return(bus, NULL);
3338 return bus->current_message;
3341 #if 0 /// UNNEEDED by elogind
3342 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3343 assert_return(bus, NULL);
3345 return bus->current_slot;
3349 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3350 assert_return(bus, NULL);
3352 return bus->current_handler;
3355 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3356 assert_return(bus, NULL);
3358 return bus->current_userdata;
3361 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3366 assert(default_bus);
3369 return !!*default_bus;
3372 *ret = sd_bus_ref(*default_bus);
3380 b->default_bus_ptr = default_bus;
3388 _public_ int sd_bus_default_system(sd_bus **ret) {
3389 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3393 _public_ int sd_bus_default_user(sd_bus **ret) {
3394 #if 0 /// elogind does not support user buses
3395 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3397 return sd_bus_default_system(ret);
3401 _public_ int sd_bus_default(sd_bus **ret) {
3405 /* Let's try our best to reuse another cached connection. If
3406 * the starter bus type is set, connect via our normal
3407 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3408 * we can share the connection with the user/system default
3411 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3413 if (streq(e, "system"))
3414 return sd_bus_default_system(ret);
3415 #if 0 /// elogind does not support systemd units
3416 else if (STR_IN_SET(e, "user", "session"))
3417 return sd_bus_default_user(ret);
3421 /* No type is specified, so we have not other option than to
3422 * use the starter address if it is set. */
3424 e = secure_getenv("DBUS_STARTER_ADDRESS");
3427 return bus_default(sd_bus_open, &default_starter_bus, ret);
3430 /* Finally, if nothing is set use the cached connection for
3431 * the right scope */
3433 #if 0 /// elogind does not support systemd units
3434 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3435 return sd_bus_default_user(ret);
3438 return sd_bus_default_system(ret);
3441 #if 0 /// UNNEEDED by elogind
3442 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3443 assert_return(b, -EINVAL);
3444 assert_return(tid, -EINVAL);
3445 assert_return(!bus_pid_changed(b), -ECHILD);
3453 return sd_event_get_tid(b->event, tid);
3458 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3459 _cleanup_free_ char *e = NULL;
3462 assert_return(object_path_is_valid(prefix), -EINVAL);
3463 assert_return(external_id, -EINVAL);
3464 assert_return(ret_path, -EINVAL);
3466 e = bus_label_escape(external_id);
3470 ret = strjoin(prefix, "/", e, NULL);
3478 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3482 assert_return(object_path_is_valid(path), -EINVAL);
3483 assert_return(object_path_is_valid(prefix), -EINVAL);
3484 assert_return(external_id, -EINVAL);
3486 e = object_path_startswith(path, prefix);
3488 *external_id = NULL;
3492 ret = bus_label_unescape(e);
3500 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3501 _cleanup_strv_free_ char **labels = NULL;
3502 char *path, *path_pos, **label_pos;
3503 const char *sep, *template_pos;
3508 assert_return(out, -EINVAL);
3509 assert_return(path_template, -EINVAL);
3511 path_length = strlen(path_template);
3513 va_start(list, path_template);
3514 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3518 arg = va_arg(list, const char *);
3524 label = bus_label_escape(arg);
3530 r = strv_consume(&labels, label);
3536 /* add label length, but account for the format character */
3537 path_length += strlen(label) - 1;
3541 path = malloc(path_length + 1);
3548 for (template_pos = path_template; *template_pos; ) {
3549 sep = strchrnul(template_pos, '%');
3550 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3554 path_pos = stpcpy(path_pos, *label_pos++);
3555 template_pos = sep + 1;
3563 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3564 _cleanup_strv_free_ char **labels = NULL;
3565 const char *template_pos, *path_pos;
3571 * This decodes an object-path based on a template argument. The
3572 * template consists of a verbatim path, optionally including special
3575 * - Each occurrence of '%' in the template matches an arbitrary
3576 * substring of a label in the given path. At most one such
3577 * directive is allowed per label. For each such directive, the
3578 * caller must provide an output parameter (char **) via va_arg. If
3579 * NULL is passed, the given label is verified, but not returned.
3580 * For each matched label, the *decoded* label is stored in the
3581 * passed output argument, and the caller is responsible to free
3582 * it. Note that the output arguments are only modified if the
3583 * actualy path matched the template. Otherwise, they're left
3586 * This function returns <0 on error, 0 if the path does not match the
3587 * template, 1 if it matched.
3590 assert_return(path, -EINVAL);
3591 assert_return(path_template, -EINVAL);
3595 for (template_pos = path_template; *template_pos; ) {
3600 /* verify everything until the next '%' matches verbatim */
3601 sep = strchrnul(template_pos, '%');
3602 length = sep - template_pos;
3603 if (strncmp(path_pos, template_pos, length))
3607 template_pos += length;
3612 /* We found the next '%' character. Everything up until here
3613 * matched. We now skip ahead to the end of this label and make
3614 * sure it matches the tail of the label in the path. Then we
3615 * decode the string in-between and save it for later use. */
3617 ++template_pos; /* skip over '%' */
3619 sep = strchrnul(template_pos, '/');
3620 length = sep - template_pos; /* length of suffix to match verbatim */
3622 /* verify the suffixes match */
3623 sep = strchrnul(path_pos, '/');
3624 if (sep - path_pos < (ssize_t)length ||
3625 strncmp(sep - length, template_pos, length))
3628 template_pos += length; /* skip over matched label */
3629 length = sep - path_pos - length; /* length of sub-label to decode */
3631 /* store unescaped label for later use */
3632 label = bus_label_unescape_n(path_pos, length);
3636 r = strv_consume(&labels, label);
3640 path_pos = sep; /* skip decoded label and suffix */
3643 /* end of template must match end of path */
3647 /* copy the labels over to the caller */
3648 va_start(list, path_template);
3649 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3652 arg = va_arg(list, char **);
3665 _public_ int sd_bus_try_close(sd_bus *bus) {
3668 assert_return(bus, -EINVAL);
3669 assert_return(!bus_pid_changed(bus), -ECHILD);
3671 if (!bus->is_kernel)
3674 if (!BUS_IS_OPEN(bus->state))
3677 if (bus->rqueue_size > 0)
3680 if (bus->wqueue_size > 0)
3683 r = bus_kernel_try_close(bus);
3691 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3692 assert_return(bus, -EINVAL);
3693 assert_return(description, -EINVAL);
3694 assert_return(bus->description, -ENXIO);
3695 assert_return(!bus_pid_changed(bus), -ECHILD);
3697 *description = bus->description;
3702 int bus_get_root_path(sd_bus *bus) {
3705 if (bus->cgroup_root)
3708 r = cg_get_root_path(&bus->cgroup_root);
3710 bus->cgroup_root = strdup("/");
3711 if (!bus->cgroup_root)
3720 #if 0 /// UNNEEDED by elogind
3721 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3724 assert_return(bus, -EINVAL);
3725 assert_return(scope, -EINVAL);
3726 assert_return(!bus_pid_changed(bus), -ECHILD);
3728 if (bus->is_kernel) {
3729 _cleanup_free_ char *n = NULL;
3732 r = bus_kernel_get_bus_name(bus, &n);
3736 if (streq(n, "0-system")) {
3741 dash = strchr(n, '-');
3742 if (streq_ptr(dash, "-user")) {
3753 if (bus->is_system) {
3761 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3763 assert_return(bus, -EINVAL);
3764 assert_return(address, -EINVAL);
3765 assert_return(!bus_pid_changed(bus), -ECHILD);
3768 *address = bus->address;
3775 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3776 assert_return(bus, -EINVAL);
3777 assert_return(mask, -EINVAL);
3778 assert_return(!bus_pid_changed(bus), -ECHILD);
3780 *mask = bus->creds_mask;
3784 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3785 assert_return(bus, -EINVAL);
3786 assert_return(!bus_pid_changed(bus), -ECHILD);
3788 return bus->bus_client;
3791 _public_ int sd_bus_is_server(sd_bus *bus) {
3792 assert_return(bus, -EINVAL);
3793 assert_return(!bus_pid_changed(bus), -ECHILD);
3795 return bus->is_server;
3798 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3799 assert_return(bus, -EINVAL);
3800 assert_return(!bus_pid_changed(bus), -ECHILD);
3802 return bus->anonymous_auth;
3805 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3806 assert_return(bus, -EINVAL);
3807 assert_return(!bus_pid_changed(bus), -ECHILD);
3809 return bus->trusted;
3812 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3813 assert_return(bus, -EINVAL);
3814 assert_return(!bus_pid_changed(bus), -ECHILD);
3816 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3819 static void flush_close(sd_bus *bus) {
3823 /* Flushes and closes the specified bus. We take a ref before,
3824 * to ensure the flushing does not cause the bus to be
3827 sd_bus_flush_close_unref(sd_bus_ref(bus));
3830 _public_ void sd_bus_default_flush_close(void) {
3831 flush_close(default_starter_bus);
3832 flush_close(default_user_bus);
3833 flush_close(default_system_bus);