1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2013 Lennart Poettering
14 #include <sys/ioctl.h>
15 #include <sys/resource.h>
16 #include <sys/socket.h>
19 #include "sd-bus-protocol.h"
21 #include "sd-daemon.h"
25 #include "alloc-util.h"
26 #include "bus-internal.h"
27 #include "bus-label.h"
28 #include "bus-message.h"
31 #include "cgroup-util.h"
36 #include "mount-util.h"
38 #include "parse-util.h"
39 #include "proc-cmdline.h"
40 //#include "rlimit-util.h"
41 #include "stdio-util.h"
43 #include "user-util.h"
45 #if 0 /// UNNEEDED by elogind
46 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
47 sd_event *e = userdata;
52 sd_bus_close(sd_bus_message_get_bus(m));
58 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
67 /* We unregister the name here and then wait for the
68 * NameOwnerChanged signal for this event to arrive before we
69 * quit. We do this in order to make sure that any queued
70 * requests are still processed before we really exit. */
72 r = sd_bus_get_unique_name(bus, &unique);
77 "sender='org.freedesktop.DBus',"
79 "interface='org.freedesktop.DBus',"
80 "member='NameOwnerChanged',"
81 "path='/org/freedesktop/DBus',"
83 "arg1='", unique, "',",
86 r = sd_bus_add_match_async(bus, NULL, match, name_owner_change_callback, NULL, e);
90 r = sd_bus_release_name_async(bus, NULL, name, NULL, NULL);
97 int bus_event_loop_with_idle(
102 check_idle_t check_idle,
104 bool exiting = false;
114 r = sd_event_get_state(e);
117 if (r == SD_EVENT_FINISHED)
121 idle = check_idle(userdata);
125 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
129 if (r == 0 && !exiting && idle) {
131 r = sd_bus_try_close(bus);
135 /* Fallback for dbus1 connections: we
136 * unregister the name and wait for the
137 * response to come through for it */
138 if (r == -EOPNOTSUPP) {
140 /* Inform the service manager that we
141 * are going down, so that it will
142 * queue all further start requests,
143 * instead of assuming we are already
145 sd_notify(false, "STOPPING=1");
147 r = bus_async_unregister_and_exit(e, bus, name);
163 r = sd_event_get_exit_code(e, &code);
171 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
172 _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
173 int r, has_owner = 0;
178 r = sd_bus_call_method(c,
179 "org.freedesktop.DBus",
180 "/org/freedesktop/dbus",
181 "org.freedesktop.DBus",
190 r = sd_bus_message_read_basic(rep, 'b', &has_owner);
192 return sd_bus_error_set_errno(error, r);
197 static int check_good_user(sd_bus_message *m, uid_t good_user) {
198 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
204 if (good_user == UID_INVALID)
207 r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
211 /* Don't trust augmented credentials for authorization */
212 assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
214 r = sd_bus_creds_get_euid(creds, &sender_uid);
218 return sender_uid == good_user;
222 sd_bus_message *call,
225 const char **details,
235 /* Tests non-interactively! */
237 r = check_good_user(call, good_user);
241 r = sd_bus_query_sender_privilege(call, capability);
248 _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
249 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
250 int authorized = false, challenge = false;
251 const char *sender, **k, **v;
253 sender = sd_bus_message_get_sender(call);
257 r = sd_bus_message_new_method_call(
260 "org.freedesktop.PolicyKit1",
261 "/org/freedesktop/PolicyKit1/Authority",
262 "org.freedesktop.PolicyKit1.Authority",
263 "CheckAuthorization");
267 r = sd_bus_message_append(
270 "system-bus-name", 1, "name", "s", sender,
275 r = sd_bus_message_open_container(request, 'a', "{ss}");
279 STRV_FOREACH_PAIR(k, v, details) {
280 r = sd_bus_message_append(request, "{ss}", *k, *v);
285 r = sd_bus_message_close_container(request);
289 r = sd_bus_message_append(request, "us", 0, NULL);
293 r = sd_bus_call(call->bus, request, 0, e, &reply);
295 /* Treat no PK available as access denied */
296 if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
297 sd_bus_error_free(e);
304 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
308 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
316 *_challenge = challenge;
327 typedef struct AsyncPolkitQuery {
328 sd_bus_message *request, *reply;
329 sd_bus_message_handler_t callback;
335 static void async_polkit_query_free(AsyncPolkitQuery *q) {
340 sd_bus_slot_unref(q->slot);
342 if (q->registry && q->request)
343 hashmap_remove(q->registry, q->request);
345 sd_bus_message_unref(q->request);
346 sd_bus_message_unref(q->reply);
351 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
352 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
353 AsyncPolkitQuery *q = userdata;
359 q->slot = sd_bus_slot_unref(q->slot);
360 q->reply = sd_bus_message_ref(reply);
362 r = sd_bus_message_rewind(q->request, true);
364 r = sd_bus_reply_method_errno(q->request, r, NULL);
368 r = q->callback(q->request, q->userdata, &error_buffer);
369 r = bus_maybe_reply_error(q->request, r, &error_buffer);
372 async_polkit_query_free(q);
379 int bus_verify_polkit_async(
380 sd_bus_message *call,
383 const char **details,
387 sd_bus_error *error) {
390 _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
392 const char *sender, **k, **v;
393 sd_bus_message_handler_t callback;
403 r = check_good_user(call, good_user);
408 q = hashmap_get(*registry, call);
410 int authorized, challenge;
412 /* This is the second invocation of this function, and
413 * there's already a response from polkit, let's
417 if (sd_bus_message_is_method_error(q->reply, NULL)) {
418 const sd_bus_error *e;
420 /* Copy error from polkit reply */
421 e = sd_bus_message_get_error(q->reply);
422 sd_bus_error_copy(error, e);
424 /* Treat no PK available as access denied */
425 if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
428 return -sd_bus_error_get_errno(e);
431 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
433 r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
442 return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
448 r = sd_bus_query_sender_privilege(call, capability);
455 if (sd_bus_get_current_message(call->bus) != call)
458 callback = sd_bus_get_current_handler(call->bus);
462 userdata = sd_bus_get_current_userdata(call->bus);
464 sender = sd_bus_message_get_sender(call);
468 c = sd_bus_message_get_allow_interactive_authorization(call);
474 r = hashmap_ensure_allocated(registry, NULL);
478 r = sd_bus_message_new_method_call(
481 "org.freedesktop.PolicyKit1",
482 "/org/freedesktop/PolicyKit1/Authority",
483 "org.freedesktop.PolicyKit1.Authority",
484 "CheckAuthorization");
488 r = sd_bus_message_append(
491 "system-bus-name", 1, "name", "s", sender,
496 r = sd_bus_message_open_container(pk, 'a', "{ss}");
500 STRV_FOREACH_PAIR(k, v, details) {
501 r = sd_bus_message_append(pk, "{ss}", *k, *v);
506 r = sd_bus_message_close_container(pk);
510 r = sd_bus_message_append(pk, "us", !!interactive, NULL);
514 q = new0(AsyncPolkitQuery, 1);
518 q->request = sd_bus_message_ref(call);
519 q->callback = callback;
520 q->userdata = userdata;
522 r = hashmap_put(*registry, call, q);
524 async_polkit_query_free(q);
528 q->registry = *registry;
530 r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
532 async_polkit_query_free(q);
542 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
544 hashmap_free_with_destructor(registry, async_polkit_query_free);
548 #if 0 /// UNNEEDED by elogind
549 int bus_check_peercred(sd_bus *c) {
555 fd = sd_bus_get_fd(c);
559 r = getpeercred(fd, &ucred);
563 if (ucred.uid != 0 && ucred.uid != geteuid())
569 int bus_connect_system_systemd(sd_bus **_bus) {
570 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
576 return sd_bus_default_system(_bus);
578 /* If we are root then let's talk directly to the system
579 * instance, instead of going via the bus */
581 r = sd_bus_new(&bus);
585 r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
589 r = sd_bus_start(bus);
591 return sd_bus_default_system(_bus);
593 r = bus_check_peercred(bus);
597 *_bus = TAKE_PTR(bus);
602 int bus_connect_user_systemd(sd_bus **_bus) {
603 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
604 _cleanup_free_ char *ee = NULL;
610 e = secure_getenv("XDG_RUNTIME_DIR");
612 return sd_bus_default_user(_bus);
614 ee = bus_address_escape(e);
618 r = sd_bus_new(&bus);
622 bus->address = strjoin("unix:path=", ee, "/systemd/private");
626 r = sd_bus_start(bus);
628 return sd_bus_default_user(_bus);
630 r = bus_check_peercred(bus);
634 *_bus = TAKE_PTR(bus);
640 #define print_property(name, fmt, ...) \
643 printf(fmt "\n", __VA_ARGS__); \
645 printf("%s=" fmt "\n", name, __VA_ARGS__); \
648 int bus_print_property(const char *name, sd_bus_message *m, bool value, bool all) {
650 const char *contents;
656 r = sd_bus_message_peek_type(m, &type, &contents);
662 case SD_BUS_TYPE_STRING: {
665 r = sd_bus_message_read_basic(m, type, &s);
669 if (all || !isempty(s)) {
672 /* This property has a single value, so we need to take
673 * care not to print a new line, everything else is OK. */
674 good = !strchr(s, '\n');
675 print_property(name, "%s", good ? s : "[unprintable]");
681 case SD_BUS_TYPE_BOOLEAN: {
684 r = sd_bus_message_read_basic(m, type, &b);
688 print_property(name, "%s", yes_no(b));
693 case SD_BUS_TYPE_UINT64: {
696 r = sd_bus_message_read_basic(m, type, &u);
700 /* Yes, heuristics! But we can change this check
701 * should it turn out to not be sufficient */
703 if (endswith(name, "Timestamp") || STR_IN_SET(name, "NextElapseUSecRealtime", "LastTriggerUSec")) {
704 char timestamp[FORMAT_TIMESTAMP_MAX];
707 t = format_timestamp(timestamp, sizeof(timestamp), u);
709 print_property(name, "%s", strempty(t));
711 } else if (strstr(name, "USec")) {
712 char timespan[FORMAT_TIMESPAN_MAX];
714 print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
715 } else if (streq(name, "RestrictNamespaces")) {
716 _cleanup_free_ char *s = NULL;
719 if ((u & NAMESPACE_FLAGS_ALL) == 0)
721 else if ((u & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL)
724 r = namespace_flags_to_string(u, &s);
731 print_property(name, "%s", result);
733 } else if (streq(name, "MountFlags")) {
736 result = mount_propagation_flags_to_string(u);
740 print_property(name, "%s", result);
742 } else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) {
743 _cleanup_free_ char *s = NULL;
745 r = capability_set_to_string_alloc(u, &s);
749 print_property(name, "%s", s);
751 } else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) ||
752 (STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) ||
753 (STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) ||
754 (STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) ||
755 (endswith(name, "NSec") && u == (uint64_t) -1))
757 print_property(name, "%s", "[not set]");
759 else if ((STR_IN_SET(name, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) ||
760 (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) ||
761 (startswith(name, "Limit") && u == (uint64_t) -1) ||
762 (startswith(name, "DefaultLimit") && u == (uint64_t) -1))
764 print_property(name, "%s", "infinity");
766 print_property(name, "%"PRIu64, u);
771 case SD_BUS_TYPE_INT64: {
774 r = sd_bus_message_read_basic(m, type, &i);
778 print_property(name, "%"PRIi64, i);
783 case SD_BUS_TYPE_UINT32: {
786 r = sd_bus_message_read_basic(m, type, &u);
790 if (strstr(name, "UMask") || strstr(name, "Mode"))
791 print_property(name, "%04o", u);
792 else if (streq(name, "UID")) {
793 if (u == UID_INVALID)
794 print_property(name, "%s", "[not set]");
796 print_property(name, "%"PRIu32, u);
797 } else if (streq(name, "GID")) {
798 if (u == GID_INVALID)
799 print_property(name, "%s", "[not set]");
801 print_property(name, "%"PRIu32, u);
803 print_property(name, "%"PRIu32, u);
808 case SD_BUS_TYPE_INT32: {
811 r = sd_bus_message_read_basic(m, type, &i);
815 print_property(name, "%"PRIi32, i);
819 case SD_BUS_TYPE_DOUBLE: {
822 r = sd_bus_message_read_basic(m, type, &d);
826 print_property(name, "%g", d);
830 case SD_BUS_TYPE_ARRAY:
831 if (streq(contents, "s")) {
835 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, contents);
839 while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &str)) > 0) {
845 /* This property has multiple space-separated values, so
846 * neither spaces nor newlines can be allowed in a value. */
847 good = str[strcspn(str, " \n")] == '\0';
849 printf("%s%s", first ? "" : " ", good ? str : "[unprintable]");
856 if (first && all && !value)
861 r = sd_bus_message_exit_container(m);
867 } else if (streq(contents, "y")) {
871 r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
881 for (i = 0; i < n; i++)
882 printf("%02x", u[i]);
889 } else if (streq(contents, "u")) {
893 r = sd_bus_message_read_array(m, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
903 for (i = 0; i < n; i++)
904 printf("%08x", u[i]);
918 int bus_message_print_all_properties(
920 bus_message_print_t func,
924 Set **found_properties) {
930 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
934 while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
936 const char *contents;
938 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &name);
942 if (found_properties) {
943 r = set_ensure_allocated(found_properties, &string_hash_ops);
947 r = set_put(*found_properties, name);
948 if (r < 0 && r != EEXIST)
952 if (!filter || strv_find(filter, name)) {
953 r = sd_bus_message_peek_type(m, NULL, &contents);
957 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
962 r = func(name, m, value, all);
964 r = bus_print_property(name, m, value, all);
969 printf("%s=[unprintable]\n", name);
970 /* skip what we didn't read */
971 r = sd_bus_message_skip(m, contents);
976 r = sd_bus_message_exit_container(m);
980 r = sd_bus_message_skip(m, "v");
985 r = sd_bus_message_exit_container(m);
992 r = sd_bus_message_exit_container(m);
999 int bus_print_all_properties(
1003 bus_message_print_t func,
1007 Set **found_properties) {
1009 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1010 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1016 r = sd_bus_call_method(bus,
1019 "org.freedesktop.DBus.Properties",
1027 return bus_message_print_all_properties(reply, func, filter, value, all, found_properties);
1030 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1031 sd_id128_t *p = userdata;
1036 r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
1043 memcpy((*p).bytes, v, n);
1050 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, unsigned flags, sd_bus_error *error, void *userdata) {
1054 r = sd_bus_message_peek_type(m, &type, NULL);
1060 case SD_BUS_TYPE_STRING: {
1061 const char **p = userdata;
1064 r = sd_bus_message_read_basic(m, type, &s);
1071 if (flags & BUS_MAP_STRDUP)
1072 return free_and_strdup((char **) userdata, s);
1078 case SD_BUS_TYPE_ARRAY: {
1079 _cleanup_strv_free_ char **l = NULL;
1080 char ***p = userdata;
1082 r = bus_message_read_strv_extend(m, &l);
1086 return strv_free_and_replace(*p, l);
1089 case SD_BUS_TYPE_BOOLEAN: {
1092 r = sd_bus_message_read_basic(m, type, &b);
1096 if (flags & BUS_MAP_BOOLEAN_AS_BOOL)
1097 * (bool*) userdata = !!b;
1099 * (int*) userdata = b;
1104 case SD_BUS_TYPE_INT32:
1105 case SD_BUS_TYPE_UINT32: {
1106 uint32_t u, *p = userdata;
1108 r = sd_bus_message_read_basic(m, type, &u);
1116 case SD_BUS_TYPE_INT64:
1117 case SD_BUS_TYPE_UINT64: {
1118 uint64_t t, *p = userdata;
1120 r = sd_bus_message_read_basic(m, type, &t);
1128 case SD_BUS_TYPE_DOUBLE: {
1129 double d, *p = userdata;
1131 r = sd_bus_message_read_basic(m, type, &d);
1142 int bus_message_map_all_properties(
1144 const struct bus_properties_map *map,
1146 sd_bus_error *error,
1154 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1158 while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1159 const struct bus_properties_map *prop;
1161 const char *contents;
1165 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1169 for (i = 0, prop = NULL; map[i].member; i++)
1170 if (streq(map[i].member, member)) {
1176 r = sd_bus_message_peek_type(m, NULL, &contents);
1180 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1184 v = (uint8_t *)userdata + prop->offset;
1186 r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
1188 r = map_basic(sd_bus_message_get_bus(m), member, m, flags, error, v);
1192 r = sd_bus_message_exit_container(m);
1196 r = sd_bus_message_skip(m, "v");
1201 r = sd_bus_message_exit_container(m);
1208 return sd_bus_message_exit_container(m);
1211 #if 0 /// UNNEEDED by elogind
1212 int bus_message_map_properties_changed(
1214 const struct bus_properties_map *map,
1216 sd_bus_error *error,
1220 int r, invalidated, i;
1225 r = bus_message_map_all_properties(m, map, flags, error, userdata);
1229 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1234 while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1235 for (i = 0; map[i].member; i++)
1236 if (streq(map[i].member, member)) {
1243 r = sd_bus_message_exit_container(m);
1251 int bus_map_all_properties(
1253 const char *destination,
1255 const struct bus_properties_map *map,
1257 sd_bus_error *error,
1258 sd_bus_message **reply,
1261 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1265 assert(destination);
1268 assert(reply || (flags & BUS_MAP_STRDUP));
1270 r = sd_bus_call_method(
1274 "org.freedesktop.DBus.Properties",
1282 r = bus_message_map_all_properties(m, map, flags, error, userdata);
1287 *reply = sd_bus_message_ref(m);
1292 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) {
1293 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1296 assert(transport >= 0);
1297 assert(transport < _BUS_TRANSPORT_MAX);
1300 assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1301 assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1303 switch (transport) {
1305 case BUS_TRANSPORT_LOCAL:
1306 #if 0 /// elogind does not support a user bus
1308 r = sd_bus_default_user(&bus);
1311 if (sd_booted() <= 0) {
1312 /* Print a friendly message when the local system is actually not running systemd as PID 1. */
1313 log_error("System has not been booted with elogind as init system (PID 1). Can't operate.");
1317 r = sd_bus_default_system(&bus);
1321 case BUS_TRANSPORT_REMOTE:
1322 r = sd_bus_open_system_remote(&bus, host);
1325 case BUS_TRANSPORT_MACHINE:
1326 r = sd_bus_open_system_machine(&bus, host);
1330 assert_not_reached("Hmm, unknown transport type.");
1335 r = sd_bus_set_exit_on_disconnect(bus, true);
1339 *ret = TAKE_PTR(bus);
1344 #if 0 /// UNNEEDED by elogind
1345 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1348 assert(transport >= 0);
1349 assert(transport < _BUS_TRANSPORT_MAX);
1352 assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1353 assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1355 switch (transport) {
1357 case BUS_TRANSPORT_LOCAL:
1359 r = bus_connect_user_systemd(bus);
1361 if (sd_booted() <= 0) {
1362 /* Print a friendly message when the local system is actually not running systemd as PID 1. */
1363 log_error("System has not been booted with systemd as init system (PID 1). Can't operate.");
1367 r = bus_connect_system_systemd(bus);
1371 case BUS_TRANSPORT_REMOTE:
1372 r = sd_bus_open_system_remote(bus, host);
1375 case BUS_TRANSPORT_MACHINE:
1376 r = sd_bus_open_system_machine(bus, host);
1380 assert_not_reached("Hmm, unknown transport type.");
1387 int bus_property_get_bool(
1390 const char *interface,
1391 const char *property,
1392 sd_bus_message *reply,
1394 sd_bus_error *error) {
1396 int b = *(bool*) userdata;
1398 return sd_bus_message_append_basic(reply, 'b', &b);
1401 int bus_property_set_bool(
1404 const char *interface,
1405 const char *property,
1406 sd_bus_message *value,
1408 sd_bus_error *error) {
1412 r = sd_bus_message_read(value, "b", &b);
1416 *(bool *) userdata = !!b;
1420 #if 0 /// UNNEEDED by elogind
1421 int bus_property_get_id128(
1424 const char *interface,
1425 const char *property,
1426 sd_bus_message *reply,
1428 sd_bus_error *error) {
1430 sd_id128_t *id = userdata;
1432 if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */
1433 return sd_bus_message_append(reply, "ay", 0);
1435 return sd_bus_message_append_array(reply, 'y', id->bytes, 16);
1439 #if __SIZEOF_SIZE_T__ != 8
1440 int bus_property_get_size(
1443 const char *interface,
1444 const char *property,
1445 sd_bus_message *reply,
1447 sd_bus_error *error) {
1449 uint64_t sz = *(size_t*) userdata;
1451 return sd_bus_message_append_basic(reply, 't', &sz);
1455 #if __SIZEOF_LONG__ != 8
1456 int bus_property_get_long(
1459 const char *interface,
1460 const char *property,
1461 sd_bus_message *reply,
1463 sd_bus_error *error) {
1465 int64_t l = *(long*) userdata;
1467 return sd_bus_message_append_basic(reply, 'x', &l);
1470 int bus_property_get_ulong(
1473 const char *interface,
1474 const char *property,
1475 sd_bus_message *reply,
1477 sd_bus_error *error) {
1479 uint64_t ul = *(unsigned long*) userdata;
1481 return sd_bus_message_append_basic(reply, 't', &ul);
1485 int bus_log_parse_error(int r) {
1486 return log_error_errno(r, "Failed to parse bus message: %m");
1489 #if 0 /// UNNEEDED by elogind
1490 int bus_log_create_error(int r) {
1491 return log_error_errno(r, "Failed to create bus message: %m");
1495 #if 0 /// UNNEEDED by elogind
1497 * bus_path_encode_unique() - encode unique object path
1498 * @b: bus connection or NULL
1499 * @prefix: object path prefix
1500 * @sender_id: unique-name of client, or NULL
1501 * @external_id: external ID to be chosen by client, or NULL
1502 * @ret_path: storage for encoded object path pointer
1504 * Whenever we provide a bus API that allows clients to create and manage
1505 * server-side objects, we need to provide a unique name for these objects. If
1506 * we let the server choose the name, we suffer from a race condition: If a
1507 * client creates an object asynchronously, it cannot destroy that object until
1508 * it received the method reply. It cannot know the name of the new object,
1509 * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1511 * Therefore, many APIs allow the client to choose the unique name for newly
1512 * created objects. There're two problems to solve, though:
1513 * 1) Object names are usually defined via dbus object paths, which are
1514 * usually globally namespaced. Therefore, multiple clients must be able
1515 * to choose unique object names without interference.
1516 * 2) If multiple libraries share the same bus connection, they must be
1517 * able to choose unique object names without interference.
1518 * The first problem is solved easily by prefixing a name with the
1519 * unique-bus-name of a connection. The server side must enforce this and
1520 * reject any other name. The second problem is solved by providing unique
1521 * suffixes from within sd-bus.
1523 * This helper allows clients to create unique object-paths. It uses the
1524 * template '/prefix/sender_id/external_id' and returns the new path in
1525 * @ret_path (must be freed by the caller).
1526 * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1527 * NULL, this function allocates a unique suffix via @b (by requesting a new
1528 * cookie). If both @sender_id and @external_id are given, @b can be passed as
1531 * Returns: 0 on success, negative error code on failure.
1533 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1534 _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1535 char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1538 assert_return(b || (sender_id && external_id), -EINVAL);
1539 assert_return(object_path_is_valid(prefix), -EINVAL);
1540 assert_return(ret_path, -EINVAL);
1543 r = sd_bus_get_unique_name(b, &sender_id);
1549 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1550 external_id = external_buf;
1553 sender_label = bus_label_escape(sender_id);
1557 external_label = bus_label_escape(external_id);
1558 if (!external_label)
1561 p = strjoin(prefix, "/", sender_label, "/", external_label);
1570 * bus_path_decode_unique() - decode unique object path
1571 * @path: object path to decode
1572 * @prefix: object path prefix
1573 * @ret_sender: output parameter for sender-id label
1574 * @ret_external: output parameter for external-id label
1576 * This does the reverse of bus_path_encode_unique() (see its description for
1577 * details). Both trailing labels, sender-id and external-id, are unescaped and
1578 * returned in the given output parameters (the caller must free them).
1580 * Note that this function returns 0 if the path does not match the template
1581 * (see bus_path_encode_unique()), 1 if it matched.
1583 * Returns: Negative error code on failure, 0 if the given object path does not
1584 * match the template (return parameters are set to NULL), 1 if it was
1585 * parsed successfully (return parameters contain allocated labels).
1587 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
1589 char *sender, *external;
1591 assert(object_path_is_valid(path));
1592 assert(object_path_is_valid(prefix));
1594 assert(ret_external);
1596 p = object_path_startswith(path, prefix);
1599 *ret_external = NULL;
1606 *ret_external = NULL;
1610 sender = bus_label_unescape_n(p, q - p);
1611 external = bus_label_unescape(q + 1);
1612 if (!sender || !external) {
1618 *ret_sender = sender;
1619 *ret_external = external;
1624 #if 0 /// UNNEEDED by elogind
1625 int bus_property_get_rlimit(
1628 const char *interface,
1629 const char *property,
1630 sd_bus_message *reply,
1632 sd_bus_error *error) {
1634 const char *is_soft;
1643 is_soft = endswith(property, "Soft");
1645 rl = *(struct rlimit**) userdata;
1647 x = is_soft ? rl->rlim_cur : rl->rlim_max;
1649 struct rlimit buf = {};
1653 /* Chop off "Soft" suffix */
1654 s = is_soft ? strndupa(property, is_soft - property) : property;
1656 /* Skip over any prefix, such as "Default" */
1657 assert_se(p = strstr(s, "Limit"));
1659 z = rlimit_from_string(p + 5);
1662 (void) getrlimit(z, &buf);
1663 x = is_soft ? buf.rlim_cur : buf.rlim_max;
1666 /* rlim_t might have different sizes, let's map RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on all
1668 u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
1670 return sd_bus_message_append(reply, "t", u);
1673 int bus_track_add_name_many(sd_bus_track *t, char **l) {
1679 /* Continues adding after failure, and returns the first failure. */
1681 STRV_FOREACH(i, l) {
1684 k = sd_bus_track_add_name(t, *i);
1685 if (k < 0 && r >= 0)
1693 int bus_open_system_watch_bind_with_description(sd_bus **ret, const char *description) {
1694 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1700 /* Match like sd_bus_open_system(), but with the "watch_bind" feature and the Connected() signal turned on. */
1702 r = sd_bus_new(&bus);
1707 r = sd_bus_set_description(bus, description);
1712 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1714 e = DEFAULT_SYSTEM_BUS_ADDRESS;
1716 r = sd_bus_set_address(bus, e);
1720 r = sd_bus_set_bus_client(bus, true);
1724 r = sd_bus_set_trusted(bus, true);
1728 r = sd_bus_negotiate_creds(bus, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS);
1732 r = sd_bus_set_watch_bind(bus, true);
1736 r = sd_bus_set_connected_signal(bus, true);
1740 r = sd_bus_start(bus);
1744 *ret = TAKE_PTR(bus);
1749 struct request_name_data {
1757 static void request_name_destroy_callback(void *userdata) {
1758 struct request_name_data *data = userdata;
1761 assert(data->n_ref > 0);
1763 log_info("%s n_ref=%u", __func__, data->n_ref);
1766 if (data->n_ref == 0)
1770 static int reload_dbus_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1771 struct request_name_data *data = userdata;
1772 const sd_bus_error *e;
1777 assert(data->n_ref > 0);
1779 e = sd_bus_message_get_error(m);
1781 log_error_errno(sd_bus_error_get_errno(e), "Failed to reload DBus configuration: %s", e->message);
1785 /* Here, use the default request name handler to avoid an infinite loop of reloading and requesting. */
1786 r = sd_bus_request_name_async(sd_bus_message_get_bus(m), NULL, data->name, data->flags, NULL, data->userdata);
1788 log_error_errno(r, "Failed to request name: %m");
1793 static int request_name_handler_may_reload_dbus(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1794 struct request_name_data *data = userdata;
1801 if (sd_bus_message_is_method_error(m, NULL)) {
1802 const sd_bus_error *e = sd_bus_message_get_error(m);
1803 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
1805 if (!sd_bus_error_has_name(e, SD_BUS_ERROR_ACCESS_DENIED)) {
1806 log_debug_errno(sd_bus_error_get_errno(e),
1807 "Unable to request name, failing connection: %s",
1810 bus_enter_closing(sd_bus_message_get_bus(m));
1814 log_debug_errno(sd_bus_error_get_errno(e),
1815 "Unable to request name, will retry after reloading DBus configuration: %s",
1818 /* If systemd-timesyncd.service enables DynamicUser= and dbus.service
1819 * started before the dynamic user is realized, then the DBus policy
1820 * about timesyncd has not been enabled yet. So, let's try to reload
1821 * DBus configuration, and after that request the name again. Note that it
1822 * seems that no privileges are necessary to call the following method. */
1824 r = sd_bus_call_method_async(
1825 sd_bus_message_get_bus(m),
1827 "org.freedesktop.DBus",
1828 "/org/freedesktop/DBus",
1829 "org.freedesktop.DBus",
1831 reload_dbus_handler,
1834 log_error_errno(r, "Failed to reload DBus configuration: %m");
1835 bus_enter_closing(sd_bus_message_get_bus(m));
1840 assert_se(sd_bus_slot_set_destroy_callback(slot, request_name_destroy_callback) >= 0);
1842 r = sd_bus_slot_set_floating(slot, true);
1849 r = sd_bus_message_read(m, "u", &ret);
1855 case BUS_NAME_ALREADY_OWNER:
1856 log_debug("Already owner of requested service name, ignoring.");
1859 case BUS_NAME_IN_QUEUE:
1860 log_debug("In queue for requested service name.");
1863 case BUS_NAME_PRIMARY_OWNER:
1864 log_debug("Successfully acquired requested service name.");
1867 case BUS_NAME_EXISTS:
1868 log_debug("Requested service name already owned, failing connection.");
1869 bus_enter_closing(sd_bus_message_get_bus(m));
1873 log_debug("Unexpected response from RequestName(), failing connection.");
1874 bus_enter_closing(sd_bus_message_get_bus(m));
1878 int bus_request_name_async_may_reload_dbus(sd_bus *bus, sd_bus_slot **ret_slot, const char *name, uint64_t flags, void *userdata) {
1879 _cleanup_free_ struct request_name_data *data = NULL;
1880 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
1883 data = new(struct request_name_data, 1);
1887 *data = (struct request_name_data) {
1891 .userdata = userdata,
1894 r = sd_bus_request_name_async(bus, &slot, name, flags, request_name_handler_may_reload_dbus, data);
1898 assert_se(sd_bus_slot_set_destroy_callback(slot, request_name_destroy_callback) >= 0);
1902 *ret_slot = TAKE_PTR(slot);
1904 r = sd_bus_slot_set_floating(slot, true);
1912 int bus_reply_pair_array(sd_bus_message *m, char **l) {
1913 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1919 /* Reply to the specified message with a message containing a dictionary put together from the specified
1922 r = sd_bus_message_new_method_return(m, &reply);
1926 r = sd_bus_message_open_container(reply, 'a', "{ss}");
1930 STRV_FOREACH_PAIR(k, v, l) {
1931 r = sd_bus_message_append(reply, "{ss}", *k, *v);
1936 r = sd_bus_message_close_container(reply);
1940 return sd_bus_send(NULL, reply, NULL);