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/>.
22 #include <sys/socket.h>
24 #include "sd-daemon.h"
30 #include "path-util.h"
33 #include "signal-util.h"
34 #include "unit-name.h"
37 #include "bus-error.h"
38 #include "bus-label.h"
39 #include "bus-message.h"
41 #include "bus-internal.h"
43 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
44 sd_event *e = userdata;
49 sd_bus_close(sd_bus_message_get_bus(m));
55 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
56 _cleanup_free_ char *match = NULL;
64 /* We unregister the name here and then wait for the
65 * NameOwnerChanged signal for this event to arrive before we
66 * quit. We do this in order to make sure that any queued
67 * requests are still processed before we really exit. */
69 r = sd_bus_get_unique_name(bus, &unique);
74 "sender='org.freedesktop.DBus',"
76 "interface='org.freedesktop.DBus',"
77 "member='NameOwnerChanged',"
78 "path='/org/freedesktop/DBus',"
81 "arg2=''", name, unique);
85 r = sd_bus_add_match(bus, NULL, match, name_owner_change_callback, e);
89 r = sd_bus_release_name(bus, name);
96 int bus_event_loop_with_idle(
101 check_idle_t check_idle,
103 bool exiting = false;
113 r = sd_event_get_state(e);
116 if (r == SD_EVENT_FINISHED)
120 idle = check_idle(userdata);
124 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
128 if (r == 0 && !exiting && idle) {
130 r = sd_bus_try_close(bus);
134 /* Fallback for dbus1 connections: we
135 * unregister the name and wait for the
136 * response to come through for it */
137 if (r == -EOPNOTSUPP) {
139 /* Inform the service manager that we
140 * are going down, so that it will
141 * queue all further start requests,
142 * instead of assuming we are already
144 sd_notify(false, "STOPPING=1");
146 r = bus_async_unregister_and_exit(e, bus, name);
162 r = sd_event_get_exit_code(e, &code);
169 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
170 _cleanup_bus_message_unref_ sd_bus_message *rep = NULL;
171 int r, has_owner = 0;
176 r = sd_bus_call_method(c,
177 "org.freedesktop.DBus",
178 "/org/freedesktop/dbus",
179 "org.freedesktop.DBus",
188 r = sd_bus_message_read_basic(rep, 'b', &has_owner);
190 return sd_bus_error_set_errno(error, r);
195 static int check_good_user(sd_bus_message *m, uid_t good_user) {
196 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
202 if (good_user == UID_INVALID)
205 r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
209 /* Don't trust augmented credentials for authorization */
210 assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
212 r = sd_bus_creds_get_euid(creds, &sender_uid);
216 return sender_uid == good_user;
220 sd_bus_message *call,
232 /* Tests non-interactively! */
234 r = check_good_user(call, good_user);
238 r = sd_bus_query_sender_privilege(call, capability);
245 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
246 int authorized = false, challenge = false;
249 sender = sd_bus_message_get_sender(call);
253 r = sd_bus_call_method(
255 "org.freedesktop.PolicyKit1",
256 "/org/freedesktop/PolicyKit1/Authority",
257 "org.freedesktop.PolicyKit1.Authority",
258 "CheckAuthorization",
262 "system-bus-name", 1, "name", "s", sender,
269 /* Treat no PK available as access denied */
270 if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
271 sd_bus_error_free(e);
278 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
282 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
290 *_challenge = challenge;
301 typedef struct AsyncPolkitQuery {
302 sd_bus_message *request, *reply;
303 sd_bus_message_handler_t callback;
309 static void async_polkit_query_free(AsyncPolkitQuery *q) {
314 sd_bus_slot_unref(q->slot);
316 if (q->registry && q->request)
317 hashmap_remove(q->registry, q->request);
319 sd_bus_message_unref(q->request);
320 sd_bus_message_unref(q->reply);
325 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
326 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
327 AsyncPolkitQuery *q = userdata;
333 q->slot = sd_bus_slot_unref(q->slot);
334 q->reply = sd_bus_message_ref(reply);
336 r = sd_bus_message_rewind(q->request, true);
338 r = sd_bus_reply_method_errno(q->request, r, NULL);
342 r = q->callback(q->request, q->userdata, &error_buffer);
343 r = bus_maybe_reply_error(q->request, r, &error_buffer);
346 async_polkit_query_free(q);
353 int bus_verify_polkit_async(
354 sd_bus_message *call,
360 sd_bus_error *error) {
363 _cleanup_bus_message_unref_ sd_bus_message *pk = NULL;
366 sd_bus_message_handler_t callback;
376 r = check_good_user(call, good_user);
381 q = hashmap_get(*registry, call);
383 int authorized, challenge;
385 /* This is the second invocation of this function, and
386 * there's already a response from polkit, let's
390 if (sd_bus_message_is_method_error(q->reply, NULL)) {
391 const sd_bus_error *e;
393 /* Copy error from polkit reply */
394 e = sd_bus_message_get_error(q->reply);
395 sd_bus_error_copy(error, e);
397 /* Treat no PK available as access denied */
398 if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
401 return -sd_bus_error_get_errno(e);
404 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
406 r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
415 return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
421 r = sd_bus_query_sender_privilege(call, capability);
428 if (sd_bus_get_current_message(call->bus) != call)
431 callback = sd_bus_get_current_handler(call->bus);
435 userdata = sd_bus_get_current_userdata(call->bus);
437 sender = sd_bus_message_get_sender(call);
441 c = sd_bus_message_get_allow_interactive_authorization(call);
447 r = hashmap_ensure_allocated(registry, NULL);
451 r = sd_bus_message_new_method_call(
454 "org.freedesktop.PolicyKit1",
455 "/org/freedesktop/PolicyKit1/Authority",
456 "org.freedesktop.PolicyKit1.Authority",
457 "CheckAuthorization");
461 r = sd_bus_message_append(
464 "system-bus-name", 1, "name", "s", sender,
472 q = new0(AsyncPolkitQuery, 1);
476 q->request = sd_bus_message_ref(call);
477 q->callback = callback;
478 q->userdata = userdata;
480 r = hashmap_put(*registry, call, q);
482 async_polkit_query_free(q);
486 q->registry = *registry;
488 r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
490 async_polkit_query_free(q);
500 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
504 while ((q = hashmap_steal_first(registry)))
505 async_polkit_query_free(q);
507 hashmap_free(registry);
511 int bus_check_peercred(sd_bus *c) {
518 fd = sd_bus_get_fd(c);
522 l = sizeof(struct ucred);
523 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
526 if (l != sizeof(struct ucred))
529 if (ucred.uid != 0 && ucred.uid != geteuid())
535 int bus_open_system_systemd(sd_bus **_bus) {
536 _cleanup_bus_unref_ sd_bus *bus = NULL;
542 return sd_bus_open_system(_bus);
544 /* If we are root and kdbus is not available, then let's talk
545 * directly to the system instance, instead of going via the
549 r = sd_bus_new(&bus);
553 r = sd_bus_set_address(bus, KERNEL_SYSTEM_BUS_ADDRESS);
557 bus->bus_client = true;
559 r = sd_bus_start(bus);
566 bus = sd_bus_unref(bus);
569 r = sd_bus_new(&bus);
573 r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
577 r = sd_bus_start(bus);
579 return sd_bus_open_system(_bus);
581 r = bus_check_peercred(bus);
591 int bus_open_user_systemd(sd_bus **_bus) {
592 _cleanup_bus_unref_ sd_bus *bus = NULL;
593 _cleanup_free_ char *ee = NULL;
597 /* Try via kdbus first, and then directly */
602 r = sd_bus_new(&bus);
606 if (asprintf(&bus->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid()) < 0)
609 bus->bus_client = true;
611 r = sd_bus_start(bus);
618 bus = sd_bus_unref(bus);
621 e = secure_getenv("XDG_RUNTIME_DIR");
623 return sd_bus_open_user(_bus);
625 ee = bus_address_escape(e);
629 r = sd_bus_new(&bus);
633 bus->address = strjoin("unix:path=", ee, "/systemd/private", NULL);
637 r = sd_bus_start(bus);
639 return sd_bus_open_user(_bus);
641 r = bus_check_peercred(bus);
651 int bus_print_property(const char *name, sd_bus_message *property, bool all) {
653 const char *contents;
659 r = sd_bus_message_peek_type(property, &type, &contents);
665 case SD_BUS_TYPE_STRING: {
668 r = sd_bus_message_read_basic(property, type, &s);
672 if (all || !isempty(s)) {
673 _cleanup_free_ char *escaped = NULL;
675 escaped = xescape(s, "\n");
679 printf("%s=%s\n", name, escaped);
685 case SD_BUS_TYPE_BOOLEAN: {
688 r = sd_bus_message_read_basic(property, type, &b);
692 printf("%s=%s\n", name, yes_no(b));
697 case SD_BUS_TYPE_UINT64: {
700 r = sd_bus_message_read_basic(property, type, &u);
704 /* Yes, heuristics! But we can change this check
705 * should it turn out to not be sufficient */
707 if (endswith(name, "Timestamp")) {
708 char timestamp[FORMAT_TIMESTAMP_MAX], *t;
710 t = format_timestamp(timestamp, sizeof(timestamp), u);
712 printf("%s=%s\n", name, strempty(t));
714 } else if (strstr(name, "USec")) {
715 char timespan[FORMAT_TIMESPAN_MAX];
717 printf("%s=%s\n", name, format_timespan(timespan, sizeof(timespan), u, 0));
719 printf("%s=%llu\n", name, (unsigned long long) u);
724 case SD_BUS_TYPE_INT64: {
727 r = sd_bus_message_read_basic(property, type, &i);
731 printf("%s=%lld\n", name, (long long) i);
736 case SD_BUS_TYPE_UINT32: {
739 r = sd_bus_message_read_basic(property, type, &u);
743 if (strstr(name, "UMask") || strstr(name, "Mode"))
744 printf("%s=%04o\n", name, u);
746 printf("%s=%u\n", name, (unsigned) u);
751 case SD_BUS_TYPE_INT32: {
754 r = sd_bus_message_read_basic(property, type, &i);
758 printf("%s=%i\n", name, (int) i);
762 case SD_BUS_TYPE_DOUBLE: {
765 r = sd_bus_message_read_basic(property, type, &d);
769 printf("%s=%g\n", name, d);
773 case SD_BUS_TYPE_ARRAY:
774 if (streq(contents, "s")) {
778 r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
782 while((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
783 _cleanup_free_ char *escaped = NULL;
788 escaped = xescape(str, "\n ");
792 printf("%s%s", first ? "" : " ", escaped);
804 r = sd_bus_message_exit_container(property);
810 } else if (streq(contents, "y")) {
814 r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
823 for (i = 0; i < n; i++)
824 printf("%02x", u[i]);
831 } else if (streq(contents, "u")) {
835 r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
844 for (i = 0; i < n; i++)
845 printf("%08x", u[i]);
859 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all) {
860 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
861 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
867 r = sd_bus_call_method(bus,
870 "org.freedesktop.DBus.Properties",
878 r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
882 while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
884 const char *contents;
886 r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
890 if (!filter || strv_find(filter, name)) {
891 r = sd_bus_message_peek_type(reply, NULL, &contents);
895 r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
899 r = bus_print_property(name, reply, all);
904 printf("%s=[unprintable]\n", name);
905 /* skip what we didn't read */
906 r = sd_bus_message_skip(reply, contents);
911 r = sd_bus_message_exit_container(reply);
915 r = sd_bus_message_skip(reply, "v");
920 r = sd_bus_message_exit_container(reply);
927 r = sd_bus_message_exit_container(reply);
934 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
935 sd_id128_t *p = userdata;
940 r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
947 memcpy((*p).bytes, v, n);
954 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
958 r = sd_bus_message_peek_type(m, &type, NULL);
963 case SD_BUS_TYPE_STRING: {
967 r = sd_bus_message_read_basic(m, type, &s);
974 r = free_and_strdup(p, s);
978 case SD_BUS_TYPE_ARRAY: {
979 _cleanup_strv_free_ char **l = NULL;
980 char ***p = userdata;
982 r = bus_message_read_strv_extend(m, &l);
993 case SD_BUS_TYPE_BOOLEAN: {
997 r = sd_bus_message_read_basic(m, type, &b);
1006 case SD_BUS_TYPE_UINT32: {
1008 uint32_t *p = userdata;
1010 r = sd_bus_message_read_basic(m, type, &u);
1019 case SD_BUS_TYPE_UINT64: {
1021 uint64_t *p = userdata;
1023 r = sd_bus_message_read_basic(m, type, &t);
1039 int bus_message_map_all_properties(
1041 const struct bus_properties_map *map,
1044 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1050 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1054 while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1055 const struct bus_properties_map *prop;
1057 const char *contents;
1061 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1065 for (i = 0, prop = NULL; map[i].member; i++)
1066 if (streq(map[i].member, member)) {
1072 r = sd_bus_message_peek_type(m, NULL, &contents);
1076 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1080 v = (uint8_t *)userdata + prop->offset;
1082 r = prop->set(sd_bus_message_get_bus(m), member, m, &error, v);
1084 r = map_basic(sd_bus_message_get_bus(m), member, m, &error, v);
1088 r = sd_bus_message_exit_container(m);
1092 r = sd_bus_message_skip(m, "v");
1097 r = sd_bus_message_exit_container(m);
1104 return sd_bus_message_exit_container(m);
1107 int bus_message_map_properties_changed(
1109 const struct bus_properties_map *map,
1113 int r, invalidated, i;
1118 r = bus_message_map_all_properties(m, map, userdata);
1122 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1127 while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1128 for (i = 0; map[i].member; i++)
1129 if (streq(map[i].member, member)) {
1136 r = sd_bus_message_exit_container(m);
1143 int bus_map_all_properties(
1145 const char *destination,
1147 const struct bus_properties_map *map,
1150 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1151 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1155 assert(destination);
1159 r = sd_bus_call_method(
1163 "org.freedesktop.DBus.Properties",
1171 return bus_message_map_all_properties(m, map, userdata);
1174 int bus_open_transport(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1177 assert(transport >= 0);
1178 assert(transport < _BUS_TRANSPORT_MAX);
1181 assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1182 assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1184 switch (transport) {
1186 case BUS_TRANSPORT_LOCAL:
1188 r = sd_bus_default_user(bus);
1190 r = sd_bus_default_system(bus);
1194 case BUS_TRANSPORT_REMOTE:
1195 r = sd_bus_open_system_remote(bus, host);
1198 case BUS_TRANSPORT_MACHINE:
1199 r = sd_bus_open_system_machine(bus, host);
1203 assert_not_reached("Hmm, unknown transport type.");
1209 int bus_open_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1212 assert(transport >= 0);
1213 assert(transport < _BUS_TRANSPORT_MAX);
1216 assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1217 assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1219 switch (transport) {
1221 case BUS_TRANSPORT_LOCAL:
1223 r = bus_open_user_systemd(bus);
1225 r = bus_open_system_systemd(bus);
1229 case BUS_TRANSPORT_REMOTE:
1230 r = sd_bus_open_system_remote(bus, host);
1233 case BUS_TRANSPORT_MACHINE:
1234 r = sd_bus_open_system_machine(bus, host);
1238 assert_not_reached("Hmm, unknown transport type.");
1244 int bus_property_get_bool(
1247 const char *interface,
1248 const char *property,
1249 sd_bus_message *reply,
1251 sd_bus_error *error) {
1253 int b = *(bool*) userdata;
1255 return sd_bus_message_append_basic(reply, 'b', &b);
1258 #if __SIZEOF_SIZE_T__ != 8
1259 int bus_property_get_size(
1262 const char *interface,
1263 const char *property,
1264 sd_bus_message *reply,
1266 sd_bus_error *error) {
1268 uint64_t sz = *(size_t*) userdata;
1270 return sd_bus_message_append_basic(reply, 't', &sz);
1274 #if __SIZEOF_LONG__ != 8
1275 int bus_property_get_long(
1278 const char *interface,
1279 const char *property,
1280 sd_bus_message *reply,
1282 sd_bus_error *error) {
1284 int64_t l = *(long*) userdata;
1286 return sd_bus_message_append_basic(reply, 'x', &l);
1289 int bus_property_get_ulong(
1292 const char *interface,
1293 const char *property,
1294 sd_bus_message *reply,
1296 sd_bus_error *error) {
1298 uint64_t ul = *(unsigned long*) userdata;
1300 return sd_bus_message_append_basic(reply, 't', &ul);
1304 int bus_log_parse_error(int r) {
1305 return log_error_errno(r, "Failed to parse bus message: %m");
1308 int bus_log_create_error(int r) {
1309 return log_error_errno(r, "Failed to create bus message: %m");
1312 int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) {
1318 return sd_bus_message_read(
1333 int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error) {
1337 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1338 sd_bus_reply_method_errno(m, r, error);
1340 } else if (sd_bus_error_is_set(error)) {
1341 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1342 sd_bus_reply_method_error(m, error);
1346 log_debug("Failed to process message [type=%s sender=%s path=%s interface=%s member=%s signature=%s]: %s",
1347 bus_message_type_to_string(m->header->type),
1350 strna(m->interface),
1352 strna(m->root_container.signature),
1353 bus_error_message(error, r));
1358 int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignment) {
1359 const char *eq, *field;
1365 eq = strchr(assignment, '=');
1367 log_error("Not an assignment: %s", assignment);
1371 field = strndupa(assignment, eq - assignment);
1374 if (streq(field, "CPUQuota")) {
1378 r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "CPUQuotaPerSecUSec");
1380 return bus_log_create_error(r);
1382 r = sd_bus_message_append(m, "v", "t", USEC_INFINITY);
1384 } else if (endswith(eq, "%")) {
1387 if (sscanf(eq, "%lf%%", &percent) != 1 || percent <= 0) {
1388 log_error("CPU quota '%s' invalid.", eq);
1392 r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "CPUQuotaPerSecUSec");
1394 return bus_log_create_error(r);
1396 r = sd_bus_message_append(m, "v", "t", (usec_t) percent * USEC_PER_SEC / 100);
1398 log_error("CPU quota needs to be in percent.");
1403 return bus_log_create_error(r);
1408 r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field);
1410 return bus_log_create_error(r);
1412 if (STR_IN_SET(field,
1413 "CPUAccounting", "MemoryAccounting", "BlockIOAccounting",
1414 "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies")) {
1416 r = parse_boolean(eq);
1418 log_error("Failed to parse boolean assignment %s.", assignment);
1422 r = sd_bus_message_append(m, "v", "b", r);
1424 } else if (streq(field, "MemoryLimit")) {
1427 r = parse_size(eq, 1024, &bytes);
1429 log_error("Failed to parse bytes specification %s", assignment);
1433 r = sd_bus_message_append(m, "v", "t", (uint64_t) bytes);
1435 } else if (STR_IN_SET(field, "CPUShares", "BlockIOWeight")) {
1438 r = safe_atou64(eq, &u);
1440 log_error("Failed to parse %s value %s.", field, eq);
1444 r = sd_bus_message_append(m, "v", "t", u);
1446 } else if (STR_IN_SET(field, "User", "Group", "DevicePolicy", "KillMode"))
1447 r = sd_bus_message_append(m, "v", "s", eq);
1449 else if (streq(field, "DeviceAllow")) {
1452 r = sd_bus_message_append(m, "v", "a(ss)", 0);
1454 const char *path, *rwm, *e;
1456 e = strchr(eq, ' ');
1458 path = strndupa(eq, e - eq);
1465 if (!path_startswith(path, "/dev")) {
1466 log_error("%s is not a device file in /dev.", path);
1470 r = sd_bus_message_append(m, "v", "a(ss)", 1, path, rwm);
1473 } else if (STR_IN_SET(field, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) {
1476 r = sd_bus_message_append(m, "v", "a(st)", 0);
1478 const char *path, *bandwidth, *e;
1481 e = strchr(eq, ' ');
1483 path = strndupa(eq, e - eq);
1486 log_error("Failed to parse %s value %s.", field, eq);
1490 if (!path_startswith(path, "/dev")) {
1491 log_error("%s is not a device file in /dev.", path);
1495 r = parse_size(bandwidth, 1000, &bytes);
1497 log_error("Failed to parse byte value %s.", bandwidth);
1501 r = sd_bus_message_append(m, "v", "a(st)", 1, path, (uint64_t) bytes);
1504 } else if (streq(field, "BlockIODeviceWeight")) {
1507 r = sd_bus_message_append(m, "v", "a(st)", 0);
1509 const char *path, *weight, *e;
1512 e = strchr(eq, ' ');
1514 path = strndupa(eq, e - eq);
1517 log_error("Failed to parse %s value %s.", field, eq);
1521 if (!path_startswith(path, "/dev")) {
1522 log_error("%s is not a device file in /dev.", path);
1526 r = safe_atou64(weight, &u);
1528 log_error("Failed to parse %s value %s.", field, weight);
1531 r = sd_bus_message_append(m, "v", "a(st)", path, u);
1534 } else if (rlimit_from_string(field) >= 0) {
1537 if (streq(eq, "infinity"))
1540 r = safe_atou64(eq, &rl);
1542 log_error("Invalid resource limit: %s", eq);
1547 r = sd_bus_message_append(m, "v", "t", rl);
1549 } else if (streq(field, "Nice")) {
1552 r = safe_atoi32(eq, &i);
1554 log_error("Failed to parse %s value %s.", field, eq);
1558 r = sd_bus_message_append(m, "v", "i", i);
1560 } else if (streq(field, "Environment")) {
1562 r = sd_bus_message_append(m, "v", "as", 1, eq);
1564 } else if (streq(field, "KillSignal")) {
1567 sig = signal_from_string_try_harder(eq);
1569 log_error("Failed to parse %s value %s.", field, eq);
1573 r = sd_bus_message_append(m, "v", "i", sig);
1575 } else if (streq(field, "AccuracySec")) {
1578 r = parse_sec(eq, &u);
1580 log_error("Failed to parse %s value %s", field, eq);
1584 r = sd_bus_message_append(m, "v", "t", u);
1587 log_error("Unknown assignment %s.", assignment);
1592 return bus_log_create_error(r);
1597 typedef struct BusWaitForJobs {
1604 sd_bus_slot *slot_job_removed;
1605 sd_bus_slot *slot_disconnected;
1608 static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1611 log_error("Warning! D-Bus connection terminated.");
1612 sd_bus_close(sd_bus_message_get_bus(m));
1617 static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1618 const char *path, *unit, *result;
1619 BusWaitForJobs *d = userdata;
1627 r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
1629 bus_log_parse_error(r);
1633 found = set_remove(d->jobs, (char*) path);
1639 if (!isempty(result))
1640 d->result = strdup(result);
1643 d->name = strdup(unit);
1648 void bus_wait_for_jobs_free(BusWaitForJobs *d) {
1652 set_free_free(d->jobs);
1654 sd_bus_slot_unref(d->slot_disconnected);
1655 sd_bus_slot_unref(d->slot_job_removed);
1657 sd_bus_unref(d->bus);
1665 int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
1666 _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
1672 d = new0(BusWaitForJobs, 1);
1676 d->bus = sd_bus_ref(bus);
1678 /* When we are a bus client we match by sender. Direct
1679 * connections OTOH have no initialized sender field, and
1680 * hence we ignore the sender then */
1681 r = sd_bus_add_match(
1683 &d->slot_job_removed,
1686 "sender='org.freedesktop.systemd1',"
1687 "interface='org.freedesktop.systemd1.Manager',"
1688 "member='JobRemoved',"
1689 "path='/org/freedesktop/systemd1'" :
1691 "interface='org.freedesktop.systemd1.Manager',"
1692 "member='JobRemoved',"
1693 "path='/org/freedesktop/systemd1'",
1694 match_job_removed, d);
1698 r = sd_bus_add_match(
1700 &d->slot_disconnected,
1702 "sender='org.freedesktop.DBus.Local',"
1703 "interface='org.freedesktop.DBus.Local',"
1704 "member='Disconnected'",
1705 match_disconnected, d);
1715 static int bus_process_wait(sd_bus *bus) {
1719 r = sd_bus_process(bus, NULL);
1725 r = sd_bus_wait(bus, (uint64_t) -1);
1731 static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
1732 _cleanup_free_ char *dbus_path = NULL;
1738 dbus_path = unit_dbus_path_from_name(d->name);
1742 return sd_bus_get_property_string(d->bus,
1743 "org.freedesktop.systemd1",
1745 "org.freedesktop.systemd1.Service",
1751 static const struct {
1752 const char *result, *explanation;
1753 } explanations [] = {
1754 { "resources", "a configured resource limit was exceeded" },
1755 { "timeout", "a timeout was exceeded" },
1756 { "exit-code", "the control process exited with error code" },
1757 { "signal", "a fatal signal was delivered to the control process" },
1758 { "core-dump", "a fatal signal was delivered causing the control process to dump core" },
1759 { "watchdog", "the service failed to send watchdog ping" },
1760 { "start-limit", "start of the service was attempted too often" }
1763 static void log_job_error_with_service_result(const char* service, const char *result) {
1764 _cleanup_free_ char *service_shell_quoted = NULL;
1768 service_shell_quoted = shell_maybe_quote(service);
1770 if (!isempty(result)) {
1773 for (i = 0; i < ELEMENTSOF(explanations); ++i)
1774 if (streq(result, explanations[i].result))
1777 if (i < ELEMENTSOF(explanations)) {
1778 log_error("Job for %s failed because %s. See \"systemctl status %s\" and \"journalctl -xe\" for details.\n",
1780 explanations[i].explanation,
1781 strna(service_shell_quoted));
1787 log_error("Job for %s failed. See \"systemctl status %s\" and \"journalctl -xe\" for details.\n",
1789 strna(service_shell_quoted));
1792 /* For some results maybe additional explanation is required */
1793 if (streq_ptr(result, "start-limit"))
1794 log_info("To force a start use \"systemctl reset-failed %1$s\" followed by \"systemctl start %1$s\" again.",
1795 strna(service_shell_quoted));
1798 static int check_wait_response(BusWaitForJobs *d, bool quiet) {
1804 if (streq(d->result, "canceled"))
1805 log_error("Job for %s canceled.", strna(d->name));
1806 else if (streq(d->result, "timeout"))
1807 log_error("Job for %s timed out.", strna(d->name));
1808 else if (streq(d->result, "dependency"))
1809 log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
1810 else if (streq(d->result, "invalid"))
1811 log_error("Job for %s invalid.", strna(d->name));
1812 else if (streq(d->result, "assert"))
1813 log_error("Assertion failed on job for %s.", strna(d->name));
1814 else if (streq(d->result, "unsupported"))
1815 log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
1816 else if (!streq(d->result, "done") && !streq(d->result, "skipped")) {
1819 _cleanup_free_ char *result = NULL;
1821 q = bus_job_get_service_result(d, &result);
1823 log_debug_errno(q, "Failed to get Result property of service %s: %m", d->name);
1825 log_job_error_with_service_result(d->name, result);
1827 log_error("Job failed. See \"journalctl -xe\" for details.");
1831 if (streq(d->result, "canceled"))
1833 else if (streq(d->result, "timeout"))
1835 else if (streq(d->result, "dependency"))
1837 else if (streq(d->result, "invalid"))
1839 else if (streq(d->result, "assert"))
1841 else if (streq(d->result, "unsupported"))
1843 else if (!streq(d->result, "done") && !streq(d->result, "skipped"))
1849 int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet) {
1854 while (!set_isempty(d->jobs)) {
1857 q = bus_process_wait(d->bus);
1859 return log_error_errno(q, "Failed to wait for response: %m");
1862 q = check_wait_response(d, quiet);
1863 /* Return the first error as it is most likely to be
1865 if (q < 0 && r == 0)
1868 log_debug_errno(q, "Got result %s/%m for job %s", strna(d->result), strna(d->name));
1881 int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
1886 r = set_ensure_allocated(&d->jobs, &string_hash_ops);
1890 return set_put_strdup(d->jobs, path);
1893 int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) {
1894 const char *type, *path, *source;
1897 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(sss)");
1899 return bus_log_parse_error(r);
1901 while ((r = sd_bus_message_read(m, "(sss)", &type, &path, &source)) > 0) {
1903 if (streq(type, "symlink"))
1904 log_info("Created symlink from %s to %s.", path, source);
1906 log_info("Removed symlink %s.", path);
1909 r = unit_file_changes_add(changes, n_changes, streq(type, "symlink") ? UNIT_FILE_SYMLINK : UNIT_FILE_UNLINK, path, source);
1914 return bus_log_parse_error(r);
1916 r = sd_bus_message_exit_container(m);
1918 return bus_log_parse_error(r);
1924 * bus_path_encode_unique() - encode unique object path
1925 * @b: bus connection or NULL
1926 * @prefix: object path prefix
1927 * @sender_id: unique-name of client, or NULL
1928 * @external_id: external ID to be chosen by client, or NULL
1929 * @ret_path: storage for encoded object path pointer
1931 * Whenever we provide a bus API that allows clients to create and manage
1932 * server-side objects, we need to provide a unique name for these objects. If
1933 * we let the server choose the name, we suffer from a race condition: If a
1934 * client creates an object asynchronously, it cannot destroy that object until
1935 * it received the method reply. It cannot know the name of the new object,
1936 * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1938 * Therefore, many APIs allow the client to choose the unique name for newly
1939 * created objects. There're two problems to solve, though:
1940 * 1) Object names are usually defined via dbus object paths, which are
1941 * usually globally namespaced. Therefore, multiple clients must be able
1942 * to choose unique object names without interference.
1943 * 2) If multiple libraries share the same bus connection, they must be
1944 * able to choose unique object names without interference.
1945 * The first problem is solved easily by prefixing a name with the
1946 * unique-bus-name of a connection. The server side must enforce this and
1947 * reject any other name. The second problem is solved by providing unique
1948 * suffixes from within sd-bus.
1950 * This helper allows clients to create unique object-paths. It uses the
1951 * template '/prefix/sender_id/external_id' and returns the new path in
1952 * @ret_path (must be freed by the caller).
1953 * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1954 * NULL, this function allocates a unique suffix via @b (by requesting a new
1955 * cookie). If both @sender_id and @external_id are given, @b can be passed as
1958 * Returns: 0 on success, negative error code on failure.
1960 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1961 _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1962 char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1965 assert_return(b || (sender_id && external_id), -EINVAL);
1966 assert_return(object_path_is_valid(prefix), -EINVAL);
1967 assert_return(ret_path, -EINVAL);
1970 r = sd_bus_get_unique_name(b, &sender_id);
1976 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1977 external_id = external_buf;
1980 sender_label = bus_label_escape(sender_id);
1984 external_label = bus_label_escape(external_id);
1985 if (!external_label)
1988 p = strjoin(prefix, "/", sender_label, "/", external_label, NULL);
1997 * bus_path_decode_unique() - decode unique object path
1998 * @path: object path to decode
1999 * @prefix: object path prefix
2000 * @ret_sender: output parameter for sender-id label
2001 * @ret_external: output parameter for external-id label
2003 * This does the reverse of bus_path_encode_unique() (see its description for
2004 * details). Both trailing labels, sender-id and external-id, are unescaped and
2005 * returned in the given output parameters (the caller must free them).
2007 * Note that this function returns 0 if the path does not match the template
2008 * (see bus_path_encode_unique()), 1 if it matched.
2010 * Returns: Negative error code on failure, 0 if the given object path does not
2011 * match the template (return parameters are set to NULL), 1 if it was
2012 * parsed successfully (return parameters contain allocated labels).
2014 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
2016 char *sender, *external;
2018 assert(object_path_is_valid(path));
2019 assert(object_path_is_valid(prefix));
2021 assert(ret_external);
2023 p = object_path_startswith(path, prefix);
2026 *ret_external = NULL;
2033 *ret_external = NULL;
2037 sender = bus_label_unescape_n(p, q - p);
2038 external = bus_label_unescape(q + 1);
2039 if (!sender || !external) {
2045 *ret_sender = sender;
2046 *ret_external = external;
2050 bool is_kdbus_wanted(void) {
2051 _cleanup_free_ char *value = NULL;
2054 if (get_proc_cmdline_key("kdbus", NULL) <= 0) {
2055 r = get_proc_cmdline_key("kdbus=", &value);
2056 if (r <= 0 || parse_boolean(value) != 1)
2063 bool is_kdbus_available(void) {
2064 _cleanup_close_ int fd = -1;
2065 struct kdbus_cmd cmd = { .size = sizeof(cmd), .flags = KDBUS_FLAG_NEGOTIATE };
2067 if (!is_kdbus_wanted())
2070 fd = open("/sys/fs/kdbus/control", O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
2074 return ioctl(fd, KDBUS_CMD_BUS_MAKE, &cmd) >= 0;