1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
39 #include "bus-internal.h"
40 #include "bus-message.h"
42 #include "bus-socket.h"
43 #include "bus-kernel.h"
44 #include "bus-control.h"
45 #include "bus-introspect.h"
46 #include "bus-signature.h"
47 #include "bus-objects.h"
49 #include "bus-container.h"
51 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
53 static void bus_close_fds(sd_bus *b) {
57 close_nointr_nofail(b->input_fd);
59 if (b->output_fd >= 0 && b->output_fd != b->input_fd)
60 close_nointr_nofail(b->output_fd);
62 b->input_fd = b->output_fd = -1;
65 static void bus_node_destroy(sd_bus *b, struct node *n) {
66 struct node_callback *c;
67 struct node_vtable *v;
68 struct node_enumerator *e;
76 bus_node_destroy(b, n->child);
78 while ((c = n->callbacks)) {
79 LIST_REMOVE(callbacks, n->callbacks, c);
83 while ((v = n->vtables)) {
84 LIST_REMOVE(vtables, n->vtables, v);
89 while ((e = n->enumerators)) {
90 LIST_REMOVE(enumerators, n->enumerators, e);
95 LIST_REMOVE(siblings, n->parent->child, n);
97 assert_se(hashmap_remove(b->nodes, n->path) == n);
102 static void bus_reset_queues(sd_bus *b) {
107 for (i = 0; i < b->rqueue_size; i++)
108 sd_bus_message_unref(b->rqueue[i]);
111 for (i = 0; i < b->wqueue_size; i++)
112 sd_bus_message_unref(b->wqueue[i]);
115 b->rqueue = b->wqueue = NULL;
116 b->rqueue_size = b->wqueue_size = 0;
119 static void bus_free(sd_bus *b) {
120 struct filter_callback *f;
125 sd_bus_detach_event(b);
130 munmap(b->kdbus_buffer, KDBUS_POOL_SIZE);
133 free(b->unique_name);
134 free(b->auth_buffer);
140 strv_free(b->exec_argv);
142 close_many(b->fds, b->n_fds);
147 hashmap_free_free(b->reply_callbacks);
148 prioq_free(b->reply_callbacks_prioq);
150 while ((f = b->filter_callbacks)) {
151 LIST_REMOVE(callbacks, b->filter_callbacks, f);
155 bus_match_free(&b->match_callbacks);
157 hashmap_free_free(b->vtable_methods);
158 hashmap_free_free(b->vtable_properties);
160 while ((n = hashmap_first(b->nodes)))
161 bus_node_destroy(b, n);
163 hashmap_free(b->nodes);
165 bus_kernel_flush_memfd(b);
167 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
172 _public_ int sd_bus_new(sd_bus **ret) {
175 assert_return(ret, -EINVAL);
181 r->n_ref = REFCNT_INIT;
182 r->input_fd = r->output_fd = -1;
183 r->message_version = 1;
184 r->hello_flags |= KDBUS_HELLO_ACCEPT_FD;
185 r->attach_flags |= KDBUS_ATTACH_NAMES;
186 r->original_pid = getpid();
188 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
190 /* We guarantee that wqueue always has space for at least one
192 r->wqueue = new(sd_bus_message*, 1);
202 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
205 assert_return(bus, -EINVAL);
206 assert_return(bus->state == BUS_UNSET, -EPERM);
207 assert_return(address, -EINVAL);
208 assert_return(!bus_pid_changed(bus), -ECHILD);
220 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
221 assert_return(bus, -EINVAL);
222 assert_return(bus->state == BUS_UNSET, -EPERM);
223 assert_return(input_fd >= 0, -EINVAL);
224 assert_return(output_fd >= 0, -EINVAL);
225 assert_return(!bus_pid_changed(bus), -ECHILD);
227 bus->input_fd = input_fd;
228 bus->output_fd = output_fd;
232 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
235 assert_return(bus, -EINVAL);
236 assert_return(bus->state == BUS_UNSET, -EPERM);
237 assert_return(path, -EINVAL);
238 assert_return(!strv_isempty(argv), -EINVAL);
239 assert_return(!bus_pid_changed(bus), -ECHILD);
251 free(bus->exec_path);
252 strv_free(bus->exec_argv);
260 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
261 assert_return(bus, -EINVAL);
262 assert_return(bus->state == BUS_UNSET, -EPERM);
263 assert_return(!bus_pid_changed(bus), -ECHILD);
265 bus->bus_client = !!b;
269 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
270 assert_return(bus, -EINVAL);
271 assert_return(bus->state == BUS_UNSET, -EPERM);
272 assert_return(!bus_pid_changed(bus), -ECHILD);
274 SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b);
278 _public_ int sd_bus_negotiate_attach_timestamp(sd_bus *bus, int b) {
279 assert_return(bus, -EINVAL);
280 assert_return(bus->state == BUS_UNSET, -EPERM);
281 assert_return(!bus_pid_changed(bus), -ECHILD);
283 SET_FLAG(bus->attach_flags, KDBUS_ATTACH_TIMESTAMP, b);
287 _public_ int sd_bus_negotiate_attach_creds(sd_bus *bus, uint64_t mask) {
288 assert_return(bus, -EINVAL);
289 assert_return(mask <= _SD_BUS_CREDS_MAX, -EINVAL);
290 assert_return(bus->state == BUS_UNSET, -EPERM);
291 assert_return(!bus_pid_changed(bus), -ECHILD);
293 return kdbus_translate_attach_flags(mask, &bus->creds_mask);
296 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
297 assert_return(bus, -EINVAL);
298 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
299 assert_return(bus->state == BUS_UNSET, -EPERM);
300 assert_return(!bus_pid_changed(bus), -ECHILD);
302 bus->is_server = !!b;
303 bus->server_id = server_id;
307 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
308 assert_return(bus, -EINVAL);
309 assert_return(bus->state == BUS_UNSET, -EPERM);
310 assert_return(!bus_pid_changed(bus), -ECHILD);
312 bus->anonymous_auth = !!b;
316 static int hello_callback(sd_bus *bus, sd_bus_message *reply, void *userdata, sd_bus_error *error) {
321 assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING);
324 r = sd_bus_message_get_errno(reply);
330 r = sd_bus_message_read(reply, "s", &s);
334 if (!service_name_is_valid(s) || s[0] != ':')
337 bus->unique_name = strdup(s);
338 if (!bus->unique_name)
341 if (bus->state == BUS_HELLO)
342 bus->state = BUS_RUNNING;
347 static int bus_send_hello(sd_bus *bus) {
348 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
353 if (!bus->bus_client || bus->is_kernel)
356 r = sd_bus_message_new_method_call(
358 "org.freedesktop.DBus",
360 "org.freedesktop.DBus",
366 return sd_bus_call_async(bus, m, hello_callback, NULL, 0, &bus->hello_serial);
369 int bus_start_running(sd_bus *bus) {
372 if (bus->bus_client && !bus->is_kernel) {
373 bus->state = BUS_HELLO;
377 bus->state = BUS_RUNNING;
381 static int parse_address_key(const char **p, const char *key, char **value) {
392 if (strncmp(*p, key, l) != 0)
405 while (*a != ';' && *a != ',' && *a != 0) {
423 c = (char) ((x << 4) | y);
430 t = realloc(r, n + 2);
458 static void skip_address_key(const char **p) {
462 *p += strcspn(*p, ",");
468 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
469 _cleanup_free_ char *path = NULL, *abstract = NULL;
478 while (**p != 0 && **p != ';') {
479 r = parse_address_key(p, "guid", guid);
485 r = parse_address_key(p, "path", &path);
491 r = parse_address_key(p, "abstract", &abstract);
500 if (!path && !abstract)
503 if (path && abstract)
508 if (l > sizeof(b->sockaddr.un.sun_path))
511 b->sockaddr.un.sun_family = AF_UNIX;
512 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
513 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
514 } else if (abstract) {
515 l = strlen(abstract);
516 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
519 b->sockaddr.un.sun_family = AF_UNIX;
520 b->sockaddr.un.sun_path[0] = 0;
521 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
522 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
528 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
529 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
531 struct addrinfo *result, hints = {
532 .ai_socktype = SOCK_STREAM,
533 .ai_flags = AI_ADDRCONFIG,
541 while (**p != 0 && **p != ';') {
542 r = parse_address_key(p, "guid", guid);
548 r = parse_address_key(p, "host", &host);
554 r = parse_address_key(p, "port", &port);
560 r = parse_address_key(p, "family", &family);
573 if (streq(family, "ipv4"))
574 hints.ai_family = AF_INET;
575 else if (streq(family, "ipv6"))
576 hints.ai_family = AF_INET6;
581 r = getaddrinfo(host, port, &hints, &result);
585 return -EADDRNOTAVAIL;
587 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
588 b->sockaddr_size = result->ai_addrlen;
590 freeaddrinfo(result);
595 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
597 unsigned n_argv = 0, j;
606 while (**p != 0 && **p != ';') {
607 r = parse_address_key(p, "guid", guid);
613 r = parse_address_key(p, "path", &path);
619 if (startswith(*p, "argv")) {
623 ul = strtoul(*p + 4, (char**) p, 10);
624 if (errno > 0 || **p != '=' || ul > 256) {
634 x = realloc(argv, sizeof(char*) * (ul + 2));
640 memset(x + n_argv, 0, sizeof(char*) * (ul - n_argv + 2));
646 r = parse_address_key(p, NULL, argv + ul);
661 /* Make sure there are no holes in the array, with the
662 * exception of argv[0] */
663 for (j = 1; j < n_argv; j++)
669 if (argv && argv[0] == NULL) {
670 argv[0] = strdup(path);
682 for (j = 0; j < n_argv; j++)
690 static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
691 _cleanup_free_ char *path = NULL;
699 while (**p != 0 && **p != ';') {
700 r = parse_address_key(p, "guid", guid);
706 r = parse_address_key(p, "path", &path);
725 static int parse_container_address(sd_bus *b, const char **p, char **guid) {
726 _cleanup_free_ char *machine = NULL;
734 while (**p != 0 && **p != ';') {
735 r = parse_address_key(p, "guid", guid);
741 r = parse_address_key(p, "machine", &machine);
754 b->machine = machine;
757 b->sockaddr.un.sun_family = AF_UNIX;
758 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
759 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/var/run/dbus/system_bus_socket") - 1;
764 static void bus_reset_parsed_address(sd_bus *b) {
768 b->sockaddr_size = 0;
769 strv_free(b->exec_argv);
773 b->server_id = SD_ID128_NULL;
780 static int bus_parse_next_address(sd_bus *b) {
781 _cleanup_free_ char *guid = NULL;
789 if (b->address[b->address_index] == 0)
792 bus_reset_parsed_address(b);
794 a = b->address + b->address_index;
803 if (startswith(a, "unix:")) {
806 r = parse_unix_address(b, &a, &guid);
811 } else if (startswith(a, "tcp:")) {
814 r = parse_tcp_address(b, &a, &guid);
820 } else if (startswith(a, "unixexec:")) {
823 r = parse_exec_address(b, &a, &guid);
829 } else if (startswith(a, "kernel:")) {
832 r = parse_kernel_address(b, &a, &guid);
837 } else if (startswith(a, "x-container:")) {
840 r = parse_container_address(b, &a, &guid);
853 r = sd_id128_from_string(guid, &b->server_id);
858 b->address_index = a - b->address;
862 static int bus_start_address(sd_bus *b) {
872 r = bus_socket_exec(b);
876 b->last_connect_error = -r;
877 } else if (b->kernel) {
879 r = bus_kernel_connect(b);
883 b->last_connect_error = -r;
885 } else if (b->machine) {
887 r = bus_container_connect(b);
891 b->last_connect_error = -r;
893 } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
895 r = bus_socket_connect(b);
899 b->last_connect_error = -r;
902 r = bus_parse_next_address(b);
906 return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
910 int bus_next_address(sd_bus *b) {
913 bus_reset_parsed_address(b);
914 return bus_start_address(b);
917 static int bus_start_fd(sd_bus *b) {
922 assert(b->input_fd >= 0);
923 assert(b->output_fd >= 0);
925 r = fd_nonblock(b->input_fd, true);
929 r = fd_cloexec(b->input_fd, true);
933 if (b->input_fd != b->output_fd) {
934 r = fd_nonblock(b->output_fd, true);
938 r = fd_cloexec(b->output_fd, true);
943 if (fstat(b->input_fd, &st) < 0)
946 if (S_ISCHR(b->input_fd))
947 return bus_kernel_take_fd(b);
949 return bus_socket_take_fd(b);
952 _public_ int sd_bus_start(sd_bus *bus) {
955 assert_return(bus, -EINVAL);
956 assert_return(bus->state == BUS_UNSET, -EPERM);
957 assert_return(!bus_pid_changed(bus), -ECHILD);
959 bus->state = BUS_OPENING;
961 if (bus->is_server && bus->bus_client)
964 if (bus->input_fd >= 0)
965 r = bus_start_fd(bus);
966 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
967 r = bus_start_address(bus);
974 return bus_send_hello(bus);
977 _public_ int sd_bus_open_system(sd_bus **ret) {
982 assert_return(ret, -EINVAL);
988 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
990 r = sd_bus_set_address(b, e);
994 b->sockaddr.un.sun_family = AF_UNIX;
995 strncpy(b->sockaddr.un.sun_path, "/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
996 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/run/dbus/system_bus_socket") - 1;
999 b->bus_client = true;
1001 r = sd_bus_start(b);
1013 _public_ int sd_bus_open_user(sd_bus **ret) {
1019 assert_return(ret, -EINVAL);
1025 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1027 r = sd_bus_set_address(b, e);
1031 e = secure_getenv("XDG_RUNTIME_DIR");
1038 if (l + 4 > sizeof(b->sockaddr.un.sun_path)) {
1043 b->sockaddr.un.sun_family = AF_UNIX;
1044 memcpy(mempcpy(b->sockaddr.un.sun_path, e, l), "/bus", 4);
1045 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 4;
1048 b->bus_client = true;
1050 r = sd_bus_start(b);
1062 _public_ int sd_bus_open_system_remote(const char *host, sd_bus **ret) {
1063 _cleanup_free_ char *e = NULL;
1068 assert_return(host, -EINVAL);
1069 assert_return(ret, -EINVAL);
1071 e = bus_address_escape(host);
1075 p = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", NULL);
1079 r = sd_bus_new(&bus);
1086 bus->bus_client = true;
1088 r = sd_bus_start(bus);
1098 _public_ int sd_bus_open_system_container(const char *machine, sd_bus **ret) {
1099 _cleanup_free_ char *e = NULL;
1104 assert_return(machine, -EINVAL);
1105 assert_return(ret, -EINVAL);
1107 e = bus_address_escape(machine);
1111 p = strjoin("x-container:machine=", e, NULL);
1115 r = sd_bus_new(&bus);
1122 bus->bus_client = true;
1124 r = sd_bus_start(bus);
1134 _public_ void sd_bus_close(sd_bus *bus) {
1138 if (bus->state == BUS_CLOSED)
1140 if (bus_pid_changed(bus))
1143 bus->state = BUS_CLOSED;
1145 sd_bus_detach_event(bus);
1147 /* Drop all queued messages so that they drop references to
1148 * the bus object and the bus may be freed */
1149 bus_reset_queues(bus);
1151 if (!bus->is_kernel)
1154 /* We'll leave the fd open in case this is a kernel bus, since
1155 * there might still be memblocks around that reference this
1156 * bus, and they might need to invoke the
1157 * KDBUS_CMD_MSG_RELEASE ioctl on the fd when they are
1161 static void bus_enter_closing(sd_bus *bus) {
1164 if (bus->state != BUS_OPENING &&
1165 bus->state != BUS_AUTHENTICATING &&
1166 bus->state != BUS_HELLO &&
1167 bus->state != BUS_RUNNING)
1170 bus->state = BUS_CLOSING;
1173 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1174 assert_return(bus, NULL);
1176 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1181 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1182 assert_return(bus, NULL);
1184 if (REFCNT_DEC(bus->n_ref) <= 0)
1190 _public_ int sd_bus_is_open(sd_bus *bus) {
1192 assert_return(bus, -EINVAL);
1193 assert_return(!bus_pid_changed(bus), -ECHILD);
1195 return BUS_IS_OPEN(bus->state);
1198 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1201 assert_return(bus, -EINVAL);
1202 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1203 assert_return(!bus_pid_changed(bus), -ECHILD);
1205 if (type == SD_BUS_TYPE_UNIX_FD) {
1206 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1209 r = bus_ensure_running(bus);
1213 return bus->can_fds;
1216 return bus_type_is_valid(type);
1219 _public_ int sd_bus_get_server_id(sd_bus *bus, sd_id128_t *server_id) {
1222 assert_return(bus, -EINVAL);
1223 assert_return(server_id, -EINVAL);
1224 assert_return(!bus_pid_changed(bus), -ECHILD);
1226 r = bus_ensure_running(bus);
1230 *server_id = bus->server_id;
1234 static int bus_seal_message(sd_bus *b, sd_bus_message *m) {
1238 if (m->header->version > b->message_version)
1242 /* If we copy the same message to multiple
1243 * destinations, avoid using the same serial
1245 b->serial = MAX(b->serial, BUS_MESSAGE_SERIAL(m));
1249 return bus_message_seal(m, ++b->serial);
1252 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1256 if (m->header->version > b->message_version)
1259 /* The bus specification says the serial number cannot be 0,
1260 * hence let's fill something in for synthetic messages. Since
1261 * synthetic messages might have a fake sender and we don't
1262 * want to interfere with the real sender's serial numbers we
1263 * pick a fixed, artifical one. We use (uint32_t) -1 rather
1264 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1265 * even though kdbus can do 64bit. */
1267 return bus_message_seal(m, 0xFFFFFFFFULL);
1270 static int bus_write_message(sd_bus *bus, sd_bus_message *message, size_t *idx) {
1277 return bus_kernel_write_message(bus, message);
1279 return bus_socket_write_message(bus, message, idx);
1284 static int dispatch_wqueue(sd_bus *bus) {
1288 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1290 while (bus->wqueue_size > 0) {
1292 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1296 /* Didn't do anything this time */
1298 else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1299 /* Fully written. Let's drop the entry from
1302 * This isn't particularly optimized, but
1303 * well, this is supposed to be our worst-case
1304 * buffer only, and the socket buffer is
1305 * supposed to be our primary buffer, and if
1306 * it got full, then all bets are off
1309 sd_bus_message_unref(bus->wqueue[0]);
1310 bus->wqueue_size --;
1311 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1321 static int bus_read_message(sd_bus *bus) {
1325 return bus_kernel_read_message(bus);
1327 return bus_socket_read_message(bus);
1330 int bus_rqueue_make_room(sd_bus *bus) {
1334 x = bus->rqueue_size + 1;
1336 if (bus->rqueue_allocated >= x)
1339 if (x > BUS_RQUEUE_MAX)
1342 q = realloc(bus->rqueue, x * sizeof(sd_bus_message*));
1347 bus->rqueue_allocated = x;
1352 static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) {
1357 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1360 if (bus->rqueue_size > 0) {
1361 /* Dispatch a queued message */
1363 *m = bus->rqueue[0];
1364 bus->rqueue_size --;
1365 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1369 /* Try to read a new message */
1370 r = bus_read_message(bus);
1380 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) {
1383 assert_return(bus, -EINVAL);
1384 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
1385 assert_return(m, -EINVAL);
1386 assert_return(!bus_pid_changed(bus), -ECHILD);
1389 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1396 /* If the serial number isn't kept, then we know that no reply
1398 if (!serial && !m->sealed)
1399 m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
1401 r = bus_seal_message(bus, m);
1405 /* If this is a reply and no reply was requested, then let's
1406 * suppress this, if we can */
1407 if (m->dont_send && !serial)
1410 if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
1413 r = bus_write_message(bus, m, &idx);
1416 else if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) {
1417 /* Wasn't fully written. So let's remember how
1418 * much was written. Note that the first entry
1419 * of the wqueue array is always allocated so
1420 * that we always can remember how much was
1422 bus->wqueue[0] = sd_bus_message_ref(m);
1423 bus->wqueue_size = 1;
1429 /* Just append it to the queue. */
1431 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1434 q = realloc(bus->wqueue, sizeof(sd_bus_message*) * (bus->wqueue_size + 1));
1439 q[bus->wqueue_size ++] = sd_bus_message_ref(m);
1443 *serial = BUS_MESSAGE_SERIAL(m);
1448 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *serial) {
1451 assert_return(bus, -EINVAL);
1452 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
1453 assert_return(m, -EINVAL);
1454 assert_return(!bus_pid_changed(bus), -ECHILD);
1456 if (!streq_ptr(m->destination, destination)) {
1461 r = sd_bus_message_set_destination(m, destination);
1466 return sd_bus_send(bus, m, serial);
1469 static usec_t calc_elapse(uint64_t usec) {
1470 if (usec == (uint64_t) -1)
1474 usec = BUS_DEFAULT_TIMEOUT;
1476 return now(CLOCK_MONOTONIC) + usec;
1479 static int timeout_compare(const void *a, const void *b) {
1480 const struct reply_callback *x = a, *y = b;
1482 if (x->timeout != 0 && y->timeout == 0)
1485 if (x->timeout == 0 && y->timeout != 0)
1488 if (x->timeout < y->timeout)
1491 if (x->timeout > y->timeout)
1497 _public_ int sd_bus_call_async(
1500 sd_bus_message_handler_t callback,
1505 struct reply_callback *c;
1508 assert_return(bus, -EINVAL);
1509 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
1510 assert_return(m, -EINVAL);
1511 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1512 assert_return(!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1513 assert_return(callback, -EINVAL);
1514 assert_return(!bus_pid_changed(bus), -ECHILD);
1516 r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func);
1520 if (usec != (uint64_t) -1) {
1521 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1526 r = bus_seal_message(bus, m);
1530 c = new0(struct reply_callback, 1);
1534 c->callback = callback;
1535 c->userdata = userdata;
1536 c->serial = BUS_MESSAGE_SERIAL(m);
1537 c->timeout = calc_elapse(usec);
1539 r = hashmap_put(bus->reply_callbacks, &c->serial, c);
1545 if (c->timeout != 0) {
1546 r = prioq_put(bus->reply_callbacks_prioq, c, &c->prioq_idx);
1549 sd_bus_call_async_cancel(bus, c->serial);
1554 r = sd_bus_send(bus, m, serial);
1556 sd_bus_call_async_cancel(bus, c->serial);
1563 _public_ int sd_bus_call_async_cancel(sd_bus *bus, uint64_t serial) {
1564 struct reply_callback *c;
1566 assert_return(bus, -EINVAL);
1567 assert_return(serial != 0, -EINVAL);
1568 assert_return(!bus_pid_changed(bus), -ECHILD);
1570 c = hashmap_remove(bus->reply_callbacks, &serial);
1574 if (c->timeout != 0)
1575 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
1581 int bus_ensure_running(sd_bus *bus) {
1586 if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING)
1588 if (bus->state == BUS_RUNNING)
1592 r = sd_bus_process(bus, NULL);
1595 if (bus->state == BUS_RUNNING)
1600 r = sd_bus_wait(bus, (uint64_t) -1);
1606 _public_ int sd_bus_call(
1610 sd_bus_error *error,
1611 sd_bus_message **reply) {
1618 assert_return(bus, -EINVAL);
1619 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
1620 assert_return(m, -EINVAL);
1621 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1622 assert_return(!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1623 assert_return(!bus_error_is_dirty(error), -EINVAL);
1624 assert_return(!bus_pid_changed(bus), -ECHILD);
1626 r = bus_ensure_running(bus);
1630 i = bus->rqueue_size;
1632 r = sd_bus_send(bus, m, &serial);
1636 timeout = calc_elapse(usec);
1641 while (i < bus->rqueue_size) {
1642 sd_bus_message *incoming = NULL;
1644 incoming = bus->rqueue[i];
1646 if (incoming->reply_serial == serial) {
1647 /* Found a match! */
1649 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1652 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
1657 sd_bus_message_unref(incoming);
1660 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
1661 r = sd_bus_error_copy(error, &incoming->error);
1665 sd_bus_message_unref(incoming);
1668 } else if (incoming->header->serial == serial &&
1671 streq(bus->unique_name, incoming->sender)) {
1673 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1676 /* Our own message? Somebody is trying
1677 * to send its own client a message,
1678 * let's not dead-lock, let's fail
1681 sd_bus_message_unref(incoming);
1685 /* Try to read more, right-away */
1689 r = bus_read_message(bus);
1698 n = now(CLOCK_MONOTONIC);
1704 left = (uint64_t) -1;
1706 r = bus_poll(bus, true, left);
1710 r = dispatch_wqueue(bus);
1716 _public_ int sd_bus_get_fd(sd_bus *bus) {
1718 assert_return(bus, -EINVAL);
1719 assert_return(bus->input_fd == bus->output_fd, -EPERM);
1720 assert_return(!bus_pid_changed(bus), -ECHILD);
1722 return bus->input_fd;
1725 _public_ int sd_bus_get_events(sd_bus *bus) {
1728 assert_return(bus, -EINVAL);
1729 assert_return(BUS_IS_OPEN(bus->state) || bus->state == BUS_CLOSING, -ENOTCONN);
1730 assert_return(!bus_pid_changed(bus), -ECHILD);
1732 if (bus->state == BUS_OPENING)
1734 else if (bus->state == BUS_AUTHENTICATING) {
1736 if (bus_socket_auth_needs_write(bus))
1741 } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
1742 if (bus->rqueue_size <= 0)
1744 if (bus->wqueue_size > 0)
1751 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
1752 struct reply_callback *c;
1754 assert_return(bus, -EINVAL);
1755 assert_return(timeout_usec, -EINVAL);
1756 assert_return(BUS_IS_OPEN(bus->state) || bus->state == BUS_CLOSING, -ENOTCONN);
1757 assert_return(!bus_pid_changed(bus), -ECHILD);
1759 if (bus->state == BUS_CLOSING) {
1764 if (bus->state == BUS_AUTHENTICATING) {
1765 *timeout_usec = bus->auth_timeout;
1769 if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) {
1770 *timeout_usec = (uint64_t) -1;
1774 if (bus->rqueue_size > 0) {
1779 c = prioq_peek(bus->reply_callbacks_prioq);
1781 *timeout_usec = (uint64_t) -1;
1785 *timeout_usec = c->timeout;
1789 static int process_timeout(sd_bus *bus) {
1790 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
1791 _cleanup_bus_message_unref_ sd_bus_message* m = NULL;
1792 struct reply_callback *c;
1798 c = prioq_peek(bus->reply_callbacks_prioq);
1802 n = now(CLOCK_MONOTONIC);
1806 r = bus_message_new_synthetic_error(
1809 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
1814 m->sender = "org.freedesktop.DBus";
1816 r = bus_seal_synthetic_message(bus, m);
1820 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
1821 hashmap_remove(bus->reply_callbacks, &c->serial);
1824 bus->iteration_counter ++;
1826 r = c->callback(bus, m, c->userdata, &error_buffer);
1827 r = bus_maybe_reply_error(m, r, &error_buffer);
1830 bus->current = NULL;
1835 static int process_hello(sd_bus *bus, sd_bus_message *m) {
1839 if (bus->state != BUS_HELLO)
1842 /* Let's make sure the first message on the bus is the HELLO
1843 * reply. But note that we don't actually parse the message
1844 * here (we leave that to the usual handling), we just verify
1845 * we don't let any earlier msg through. */
1847 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
1848 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
1851 if (m->reply_serial != bus->hello_serial)
1857 static int process_reply(sd_bus *bus, sd_bus_message *m) {
1858 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
1859 struct reply_callback *c;
1865 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
1866 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
1869 c = hashmap_remove(bus->reply_callbacks, &m->reply_serial);
1873 if (c->timeout != 0)
1874 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
1876 r = sd_bus_message_rewind(m, true);
1880 r = c->callback(bus, m, c->userdata, &error_buffer);
1881 r = bus_maybe_reply_error(m, r, &error_buffer);
1887 static int process_filter(sd_bus *bus, sd_bus_message *m) {
1888 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
1889 struct filter_callback *l;
1896 bus->filter_callbacks_modified = false;
1898 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
1900 if (bus->filter_callbacks_modified)
1903 /* Don't run this more than once per iteration */
1904 if (l->last_iteration == bus->iteration_counter)
1907 l->last_iteration = bus->iteration_counter;
1909 r = sd_bus_message_rewind(m, true);
1913 r = l->callback(bus, m, l->userdata, &error_buffer);
1914 r = bus_maybe_reply_error(m, r, &error_buffer);
1920 } while (bus->filter_callbacks_modified);
1925 static int process_match(sd_bus *bus, sd_bus_message *m) {
1932 bus->match_callbacks_modified = false;
1934 r = bus_match_run(bus, &bus->match_callbacks, m);
1938 } while (bus->match_callbacks_modified);
1943 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
1944 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
1950 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
1953 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
1956 if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
1959 if (streq_ptr(m->member, "Ping"))
1960 r = sd_bus_message_new_method_return(m, &reply);
1961 else if (streq_ptr(m->member, "GetMachineId")) {
1965 r = sd_id128_get_machine(&id);
1969 r = sd_bus_message_new_method_return(m, &reply);
1973 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
1975 r = sd_bus_message_new_method_errorf(
1977 SD_BUS_ERROR_UNKNOWN_METHOD,
1978 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
1984 r = sd_bus_send(bus, reply, NULL);
1991 static int process_message(sd_bus *bus, sd_bus_message *m) {
1998 bus->iteration_counter++;
2000 log_debug("Got message sender=%s object=%s interface=%s member=%s",
2001 strna(sd_bus_message_get_sender(m)),
2002 strna(sd_bus_message_get_path(m)),
2003 strna(sd_bus_message_get_interface(m)),
2004 strna(sd_bus_message_get_member(m)));
2006 r = process_hello(bus, m);
2010 r = process_reply(bus, m);
2014 r = process_filter(bus, m);
2018 r = process_match(bus, m);
2022 r = process_builtin(bus, m);
2026 r = bus_process_object(bus, m);
2029 bus->current = NULL;
2033 static int process_running(sd_bus *bus, sd_bus_message **ret) {
2034 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
2038 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
2040 r = process_timeout(bus);
2044 r = dispatch_wqueue(bus);
2048 r = dispatch_rqueue(bus, &m);
2054 r = process_message(bus, m);
2059 r = sd_bus_message_rewind(m, true);
2068 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2070 r = sd_bus_reply_method_errorf(
2072 SD_BUS_ERROR_UNKNOWN_OBJECT,
2073 "Unknown object '%s'.", m->path);
2087 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2088 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
2089 struct reply_callback *c;
2093 assert(bus->state == BUS_CLOSING);
2095 c = hashmap_first(bus->reply_callbacks);
2097 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2099 /* First, fail all outstanding method calls */
2100 r = bus_message_new_synthetic_error(
2103 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2108 r = bus_seal_synthetic_message(bus, m);
2112 if (c->timeout != 0)
2113 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2115 hashmap_remove(bus->reply_callbacks, &c->serial);
2118 bus->iteration_counter++;
2120 r = c->callback(bus, m, c->userdata, &error_buffer);
2121 r = bus_maybe_reply_error(m, r, &error_buffer);
2127 /* Then, synthesize a Disconnected message */
2128 r = sd_bus_message_new_signal(
2130 "/org/freedesktop/DBus/Local",
2131 "org.freedesktop.DBus.Local",
2137 m->sender = "org.freedesktop.DBus.Local";
2139 r = bus_seal_synthetic_message(bus, m);
2146 bus->iteration_counter++;
2148 r = process_filter(bus, m);
2152 r = process_match(bus, m);
2164 bus->current = NULL;
2168 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2169 BUS_DONT_DESTROY(bus);
2172 /* Returns 0 when we didn't do anything. This should cause the
2173 * caller to invoke sd_bus_wait() before returning the next
2174 * time. Returns > 0 when we did something, which possibly
2175 * means *ret is filled in with an unprocessed message. */
2177 assert_return(bus, -EINVAL);
2178 assert_return(!bus_pid_changed(bus), -ECHILD);
2180 /* We don't allow recursively invoking sd_bus_process(). */
2181 assert_return(!bus->current, -EBUSY);
2183 switch (bus->state) {
2190 r = bus_socket_process_opening(bus);
2191 if (r == -ECONNRESET || r == -EPIPE) {
2192 bus_enter_closing(bus);
2200 case BUS_AUTHENTICATING:
2201 r = bus_socket_process_authenticating(bus);
2202 if (r == -ECONNRESET || r == -EPIPE) {
2203 bus_enter_closing(bus);
2215 r = process_running(bus, ret);
2216 if (r == -ECONNRESET || r == -EPIPE) {
2217 bus_enter_closing(bus);
2227 return process_closing(bus, ret);
2230 assert_not_reached("Unknown state");
2233 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2234 struct pollfd p[2] = {};
2237 usec_t m = (usec_t) -1;
2241 if (bus->state == BUS_CLOSING)
2244 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
2246 e = sd_bus_get_events(bus);
2251 /* The caller really needs some more data, he doesn't
2252 * care about what's already read, or any timeouts
2257 /* The caller wants to process if there's something to
2258 * process, but doesn't care otherwise */
2260 r = sd_bus_get_timeout(bus, &until);
2265 nw = now(CLOCK_MONOTONIC);
2266 m = until > nw ? until - nw : 0;
2270 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2273 p[0].fd = bus->input_fd;
2274 if (bus->output_fd == bus->input_fd) {
2278 p[0].events = e & POLLIN;
2279 p[1].fd = bus->output_fd;
2280 p[1].events = e & POLLOUT;
2284 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2288 return r > 0 ? 1 : 0;
2291 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2293 assert_return(bus, -EINVAL);
2294 assert_return(!bus_pid_changed(bus), -ECHILD);
2296 if (bus->state == BUS_CLOSING)
2299 assert_return(BUS_IS_OPEN(bus->state) , -ENOTCONN);
2301 if (bus->rqueue_size > 0)
2304 return bus_poll(bus, false, timeout_usec);
2307 _public_ int sd_bus_flush(sd_bus *bus) {
2310 assert_return(bus, -EINVAL);
2311 assert_return(!bus_pid_changed(bus), -ECHILD);
2313 if (bus->state == BUS_CLOSING)
2316 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
2318 r = bus_ensure_running(bus);
2322 if (bus->wqueue_size <= 0)
2326 r = dispatch_wqueue(bus);
2330 if (bus->wqueue_size <= 0)
2333 r = bus_poll(bus, false, (uint64_t) -1);
2339 _public_ int sd_bus_add_filter(sd_bus *bus,
2340 sd_bus_message_handler_t callback,
2343 struct filter_callback *f;
2345 assert_return(bus, -EINVAL);
2346 assert_return(callback, -EINVAL);
2347 assert_return(!bus_pid_changed(bus), -ECHILD);
2349 f = new0(struct filter_callback, 1);
2352 f->callback = callback;
2353 f->userdata = userdata;
2355 bus->filter_callbacks_modified = true;
2356 LIST_PREPEND(callbacks, bus->filter_callbacks, f);
2360 _public_ int sd_bus_remove_filter(sd_bus *bus,
2361 sd_bus_message_handler_t callback,
2364 struct filter_callback *f;
2366 assert_return(bus, -EINVAL);
2367 assert_return(callback, -EINVAL);
2368 assert_return(!bus_pid_changed(bus), -ECHILD);
2370 LIST_FOREACH(callbacks, f, bus->filter_callbacks) {
2371 if (f->callback == callback && f->userdata == userdata) {
2372 bus->filter_callbacks_modified = true;
2373 LIST_REMOVE(callbacks, bus->filter_callbacks, f);
2382 _public_ int sd_bus_add_match(sd_bus *bus,
2384 sd_bus_message_handler_t callback,
2387 struct bus_match_component *components = NULL;
2388 unsigned n_components = 0;
2389 uint64_t cookie = 0;
2392 assert_return(bus, -EINVAL);
2393 assert_return(match, -EINVAL);
2394 assert_return(!bus_pid_changed(bus), -ECHILD);
2396 r = bus_match_parse(match, &components, &n_components);
2400 if (bus->bus_client) {
2401 cookie = ++bus->match_cookie;
2403 r = bus_add_match_internal(bus, match, components, n_components, cookie);
2408 bus->match_callbacks_modified = true;
2409 r = bus_match_add(&bus->match_callbacks, components, n_components, callback, userdata, cookie, NULL);
2411 if (bus->bus_client)
2412 bus_remove_match_internal(bus, match, cookie);
2416 bus_match_parse_free(components, n_components);
2420 _public_ int sd_bus_remove_match(sd_bus *bus,
2422 sd_bus_message_handler_t callback,
2425 struct bus_match_component *components = NULL;
2426 unsigned n_components = 0;
2428 uint64_t cookie = 0;
2430 assert_return(bus, -EINVAL);
2431 assert_return(match, -EINVAL);
2432 assert_return(!bus_pid_changed(bus), -ECHILD);
2434 r = bus_match_parse(match, &components, &n_components);
2438 bus->match_callbacks_modified = true;
2439 r = bus_match_remove(&bus->match_callbacks, components, n_components, callback, userdata, &cookie);
2441 if (bus->bus_client)
2442 q = bus_remove_match_internal(bus, match, cookie);
2444 bus_match_parse_free(components, n_components);
2446 return r < 0 ? r : q;
2449 bool bus_pid_changed(sd_bus *bus) {
2452 /* We don't support people creating a bus connection and
2453 * keeping it around over a fork(). Let's complain. */
2455 return bus->original_pid != getpid();
2458 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
2459 sd_bus *bus = userdata;
2464 r = sd_bus_process(bus, NULL);
2471 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
2472 sd_bus *bus = userdata;
2477 r = sd_bus_process(bus, NULL);
2484 static int prepare_callback(sd_event_source *s, void *userdata) {
2485 sd_bus *bus = userdata;
2492 e = sd_bus_get_events(bus);
2496 if (bus->output_fd != bus->input_fd) {
2498 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
2502 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
2506 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
2511 r = sd_bus_get_timeout(bus, &until);
2517 j = sd_event_source_set_time(bus->time_event_source, until);
2522 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
2529 static int quit_callback(sd_event_source *event, void *userdata) {
2530 sd_bus *bus = userdata;
2539 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
2542 assert_return(bus, -EINVAL);
2543 assert_return(!bus->event, -EBUSY);
2545 assert(!bus->input_io_event_source);
2546 assert(!bus->output_io_event_source);
2547 assert(!bus->time_event_source);
2550 bus->event = sd_event_ref(event);
2552 r = sd_event_default(&bus->event);
2557 r = sd_event_add_io(bus->event, bus->input_fd, 0, io_callback, bus, &bus->input_io_event_source);
2561 r = sd_event_source_set_priority(bus->input_io_event_source, priority);
2565 if (bus->output_fd != bus->input_fd) {
2566 r = sd_event_add_io(bus->event, bus->output_fd, 0, io_callback, bus, &bus->output_io_event_source);
2570 r = sd_event_source_set_priority(bus->output_io_event_source, priority);
2575 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
2579 r = sd_event_add_monotonic(bus->event, 0, 0, time_callback, bus, &bus->time_event_source);
2583 r = sd_event_source_set_priority(bus->time_event_source, priority);
2587 r = sd_event_add_quit(bus->event, quit_callback, bus, &bus->quit_event_source);
2594 sd_bus_detach_event(bus);
2598 _public_ int sd_bus_detach_event(sd_bus *bus) {
2599 assert_return(bus, -EINVAL);
2600 assert_return(bus->event, -ENXIO);
2602 if (bus->input_io_event_source) {
2603 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
2604 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
2607 if (bus->output_io_event_source) {
2608 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
2609 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
2612 if (bus->time_event_source) {
2613 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
2614 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
2617 if (bus->quit_event_source) {
2618 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
2619 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
2623 bus->event = sd_event_unref(bus->event);
2628 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
2629 assert_return(bus, NULL);
2634 _public_ sd_bus_message* sd_bus_get_current(sd_bus *bus) {
2635 assert_return(bus, NULL);
2637 return bus->current;
2640 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
2645 assert(default_bus);
2648 return !!*default_bus;
2651 *ret = sd_bus_ref(*default_bus);
2659 b->default_bus_ptr = default_bus;
2667 _public_ int sd_bus_default_system(sd_bus **ret) {
2668 static __thread sd_bus *default_system_bus = NULL;
2670 return bus_default(sd_bus_open_system, &default_system_bus, ret);
2673 _public_ int sd_bus_default_user(sd_bus **ret) {
2674 static __thread sd_bus *default_user_bus = NULL;
2676 return bus_default(sd_bus_open_user, &default_user_bus, ret);
2679 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
2680 assert_return(b, -EINVAL);
2681 assert_return(tid, -EINVAL);
2682 assert_return(!bus_pid_changed(b), -ECHILD);
2690 return sd_event_get_tid(b->event, tid);
2695 _public_ char *sd_bus_label_escape(const char *s) {
2699 assert_return(s, NULL);
2701 /* Escapes all chars that D-Bus' object path cannot deal
2702 * with. Can be reversed with bus_path_unescape(). We special
2703 * case the empty string. */
2708 r = new(char, strlen(s)*3 + 1);
2712 for (f = s, t = r; *f; f++) {
2714 /* Escape everything that is not a-zA-Z0-9. We also
2715 * escape 0-9 if it's the first character */
2717 if (!(*f >= 'A' && *f <= 'Z') &&
2718 !(*f >= 'a' && *f <= 'z') &&
2719 !(f > s && *f >= '0' && *f <= '9')) {
2721 *(t++) = hexchar(*f >> 4);
2722 *(t++) = hexchar(*f);
2732 _public_ char *sd_bus_label_unescape(const char *f) {
2735 assert_return(f, NULL);
2737 /* Special case for the empty string */
2741 r = new(char, strlen(f) + 1);
2745 for (t = r; *f; f++) {
2750 if ((a = unhexchar(f[1])) < 0 ||
2751 (b = unhexchar(f[2])) < 0) {
2752 /* Invalid escape code, let's take it literal then */
2755 *(t++) = (char) ((a << 4) | b);
2767 _public_ int sd_bus_get_peer_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
2772 assert_return(bus, -EINVAL);
2773 assert_return(mask <= _SD_BUS_CREDS_MAX, -ENOTSUP);
2774 assert_return(ret, -EINVAL);
2775 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
2776 assert_return(!bus_pid_changed(bus), -ECHILD);
2777 assert_return(!bus->is_kernel, -ENOTSUP);
2779 if (!bus->ucred_valid && !isempty(bus->label))
2782 c = bus_creds_new();
2786 if (bus->ucred_valid) {
2787 pid = c->pid = bus->ucred.pid;
2788 c->uid = bus->ucred.uid;
2789 c->gid = bus->ucred.gid;
2791 c->mask |= ((SD_BUS_CREDS_UID | SD_BUS_CREDS_PID | SD_BUS_CREDS_GID) & mask) & bus->creds_mask;
2794 if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) {
2795 c->label = strdup(bus->label);
2797 sd_bus_creds_unref(c);
2801 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT | bus->creds_mask;
2804 r = bus_creds_add_more(c, mask, pid, 0);