2 This file is part of systemd.
4 Copyright 2013 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 #ifdef HAVE_VALGRIND_MEMCHECK_H
21 #include <valgrind/memcheck.h>
27 #include <sys/prctl.h>
29 /* When we include libgen.h because we need dirname() we immediately
30 * undefine basename() since libgen.h defines it as a macro to the POSIX
31 * version which is really broken. We prefer GNU basename(). */
35 #include "alloc-util.h"
36 #include "bus-bloom.h"
37 #include "bus-internal.h"
38 #include "bus-kernel.h"
39 #include "bus-label.h"
40 #include "bus-message.h"
42 #include "capability-util.h"
45 #include "format-util.h"
46 #include "memfd-util.h"
47 #include "parse-util.h"
48 #include "stdio-util.h"
49 #include "string-util.h"
51 #include "user-util.h"
54 #pragma GCC diagnostic ignored "-Wformat"
56 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
58 int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
64 if (!startswith(s, ":1."))
67 r = safe_atou64(s + 3, id);
74 static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
80 /* Note that p can be NULL, which encodes a region full of
81 * zeroes, which is useful to optimize certain padding
84 (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
85 (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
86 (*d)->vec.address = PTR_TO_UINT64(p);
89 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
92 static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) {
98 (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
99 (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
100 (*d)->memfd.fd = memfd;
101 (*d)->memfd.start = start;
102 (*d)->memfd.size = sz;
104 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
107 static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
113 (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
114 (*d)->type = KDBUS_ITEM_DST_NAME;
115 memcpy((*d)->str, s, length + 1);
117 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
120 static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
121 struct kdbus_item *i;
127 i->size = offsetof(struct kdbus_item, bloom_filter) +
128 offsetof(struct kdbus_bloom_filter, data) +
130 i->type = KDBUS_ITEM_BLOOM_FILTER;
132 *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
134 return &i->bloom_filter;
137 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
143 (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
144 (*d)->type = KDBUS_ITEM_FDS;
145 memcpy((*d)->fds, fds, sizeof(int) * n_fds);
147 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
150 static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) {
151 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
159 e = stpcpy(buf, "arg");
161 *(e++) = '0' + (char) i;
163 *(e++) = '0' + (char) (i / 10);
164 *(e++) = '0' + (char) (i % 10);
168 bloom_add_pair(data, size, n_hash, buf, t);
170 strcpy(e, "-dot-prefix");
171 bloom_add_prefixes(data, size, n_hash, buf, t, '.');
172 strcpy(e, "-slash-prefix");
173 bloom_add_prefixes(data, size, n_hash, buf, t, '/');
176 static void add_bloom_arg_has(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) {
177 char buf[sizeof("arg")-1 + 2 + sizeof("-has")];
185 e = stpcpy(buf, "arg");
187 *(e++) = '0' + (char) i;
189 *(e++) = '0' + (char) (i / 10);
190 *(e++) = '0' + (char) (i % 10);
194 bloom_add_pair(data, size, n_hash, buf, t);
197 static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
206 memzero(data, m->bus->bloom_size);
207 bloom->generation = 0;
209 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
212 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
214 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
216 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
217 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
218 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
221 r = sd_bus_message_rewind(m, true);
225 for (i = 0; i < 64; i++) {
226 const char *t, *contents;
229 r = sd_bus_message_peek_type(m, &type, &contents);
233 if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) {
235 /* The bloom filter includes simple strings of any kind */
236 r = sd_bus_message_read_basic(m, type, &t);
240 add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
243 if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) {
245 /* As well as array of simple strings of any kinds */
246 r = sd_bus_message_enter_container(m, type, contents);
250 while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0)
251 add_bloom_arg_has(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
255 r = sd_bus_message_exit_container(m);
260 /* Stop adding to bloom filter as soon as we
261 * run into the first argument we cannot add
269 static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
270 struct bus_body_part *part;
271 struct kdbus_item *d;
272 const char *destination;
273 bool well_known = false;
283 /* We put this together only once, if this message is reused
284 * we reuse the earlier-built version */
288 destination = m->destination ?: m->destination_ptr;
291 r = bus_kernel_parse_unique_name(destination, &dst_id);
297 /* verify_destination_id will usually be 0, which makes the kernel
298 * driver only look at the provided well-known name. Otherwise,
299 * the kernel will make sure the provided destination id matches
300 * the owner of the provided well-known-name, and fail if they
301 * differ. Currently, this is only needed for bus-proxyd. */
302 dst_id = m->verify_destination_id;
305 dst_id = KDBUS_DST_ID_BROADCAST;
307 sz = offsetof(struct kdbus_msg, items);
309 /* Add in fixed header, fields header and payload */
310 sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) +
311 MAX(sizeof(struct kdbus_vec),
312 sizeof(struct kdbus_memfd)));
314 /* Add space for bloom filter */
315 sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
316 offsetof(struct kdbus_bloom_filter, data) +
319 /* Add in well-known destination header */
321 dl = strlen(destination);
322 sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
325 /* Add space for unix fds */
327 sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
329 m->kdbus = memalign(8, sz);
335 m->free_kdbus = true;
336 memzero(m->kdbus, sz);
339 ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) |
340 ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) |
341 ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0);
343 m->kdbus->dst_id = dst_id;
344 m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
345 m->kdbus->cookie = m->header->dbus2.cookie;
346 m->kdbus->priority = m->priority;
348 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
349 m->kdbus->cookie_reply = m->reply_cookie;
353 assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0);
354 m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec +
355 m->timeout * NSEC_PER_USEC;
361 append_destination(&d, destination, dl);
363 append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
365 MESSAGE_FOREACH_PART(part, i, m) {
367 /* If this is padding then simply send a
368 * vector with a NULL data pointer which the
369 * kernel will just pass through. This is the
370 * most efficient way to encode zeroes */
372 append_payload_vec(&d, NULL, part->size);
376 if (part->memfd >= 0 && part->sealed && destination) {
377 /* Try to send a memfd, if the part is
378 * sealed and this is not a broadcast. Since we can only */
380 append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size);
384 /* Otherwise, let's send a vector to the actual data.
385 * For that, we need to map it first. */
386 r = bus_body_part_map(part);
390 append_payload_vec(&d, part->data, part->size);
393 if (m->header->type == SD_BUS_MESSAGE_SIGNAL) {
394 struct kdbus_bloom_filter *bloom;
396 bloom = append_bloom(&d, m->bus->bloom_size);
397 r = bus_message_setup_bloom(m, bloom);
403 append_fds(&d, m->fds, m->n_fds);
405 m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
406 assert(m->kdbus->size <= sz);
415 static void unset_memfds(struct sd_bus_message *m) {
416 struct bus_body_part *part;
421 /* Make sure the memfds are not freed twice */
422 MESSAGE_FOREACH_PART(part, i, m)
423 if (part->memfd >= 0)
427 static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) {
434 if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP))
437 m->realtime = ts->realtime_ns / NSEC_PER_USEC;
438 m->monotonic = ts->monotonic_ns / NSEC_PER_USEC;
439 m->seqnum = ts->seqnum;
442 static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
443 sd_bus_message *m = NULL;
444 struct kdbus_item *d;
446 _cleanup_free_ int *fds = NULL;
447 struct bus_header *header = NULL;
449 size_t header_size = 0, footer_size = 0;
450 size_t n_bytes = 0, idx = 0;
451 const char *destination = NULL, *seclabel = NULL;
452 bool last_was_memfd = false;
457 assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
459 KDBUS_ITEM_FOREACH(d, k, items) {
462 l = d->size - offsetof(struct kdbus_item, data);
466 case KDBUS_ITEM_PAYLOAD_OFF:
468 header = (struct bus_header*)((uint8_t*) k + d->vec.offset);
469 header_size = d->vec.size;
472 footer = (uint8_t*) k + d->vec.offset;
473 footer_size = d->vec.size;
475 n_bytes += d->vec.size;
476 last_was_memfd = false;
479 case KDBUS_ITEM_PAYLOAD_MEMFD:
480 if (!header) /* memfd cannot be first part */
483 n_bytes += d->memfd.size;
484 last_was_memfd = true;
487 case KDBUS_ITEM_FDS: {
492 f = realloc(fds, sizeof(int) * (n_fds + j));
497 memcpy(fds + n_fds, d->fds, sizeof(int) * j);
502 case KDBUS_ITEM_SECLABEL:
508 if (last_was_memfd) /* memfd cannot be last part */
514 if (header_size < sizeof(struct bus_header))
517 /* on kdbus we only speak native endian gvariant, never dbus1
518 * marshalling or reverse endian */
519 if (header->version != 2 ||
520 header->endian != BUS_NATIVE_ENDIAN)
523 r = bus_message_from_header(
533 /* The well-known names list is different from the other
534 credentials. If we asked for it, but nothing is there, this
535 means that the list of well-known names is simply empty, not
536 that we lack any data */
538 m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
540 KDBUS_ITEM_FOREACH(d, k, items) {
543 l = d->size - offsetof(struct kdbus_item, data);
547 case KDBUS_ITEM_PAYLOAD_OFF: {
550 begin_body = BUS_MESSAGE_BODY_BEGIN(m);
552 if (idx + d->vec.size > begin_body) {
553 struct bus_body_part *part;
555 /* Contains body material */
557 part = message_append_part(m);
563 /* A -1 offset is NUL padding. */
564 part->is_zero = d->vec.offset == ~0ULL;
566 if (idx >= begin_body) {
568 part->data = (uint8_t* )k + d->vec.offset;
569 part->size = d->vec.size;
572 part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx);
573 part->size = d->vec.size - (begin_body - idx);
583 case KDBUS_ITEM_PAYLOAD_MEMFD: {
584 struct bus_body_part *part;
586 if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
591 part = message_append_part(m);
597 part->memfd = d->memfd.fd;
598 part->memfd_offset = d->memfd.start;
599 part->size = d->memfd.size;
602 idx += d->memfd.size;
606 case KDBUS_ITEM_PIDS:
608 /* The PID/TID might be missing, when the data
609 * is faked by a bus proxy and it lacks that
610 * information about the real client (since
611 * SO_PEERCRED is used for that). Also kernel
612 * namespacing might make some of this data
613 * unavailable when untranslatable. */
615 if (d->pids.pid > 0) {
616 m->creds.pid = (pid_t) d->pids.pid;
617 m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask;
620 if (d->pids.tid > 0) {
621 m->creds.tid = (pid_t) d->pids.tid;
622 m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
625 if (d->pids.ppid > 0) {
626 m->creds.ppid = (pid_t) d->pids.ppid;
627 m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
628 } else if (d->pids.pid == 1) {
630 m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
635 case KDBUS_ITEM_CREDS:
637 /* EUID/SUID/FSUID/EGID/SGID/FSGID might be
638 * missing too (see above). */
640 if ((uid_t) d->creds.uid != UID_INVALID) {
641 m->creds.uid = (uid_t) d->creds.uid;
642 m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask;
645 if ((uid_t) d->creds.euid != UID_INVALID) {
646 m->creds.euid = (uid_t) d->creds.euid;
647 m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask;
650 if ((uid_t) d->creds.suid != UID_INVALID) {
651 m->creds.suid = (uid_t) d->creds.suid;
652 m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask;
655 if ((uid_t) d->creds.fsuid != UID_INVALID) {
656 m->creds.fsuid = (uid_t) d->creds.fsuid;
657 m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask;
660 if ((gid_t) d->creds.gid != GID_INVALID) {
661 m->creds.gid = (gid_t) d->creds.gid;
662 m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask;
665 if ((gid_t) d->creds.egid != GID_INVALID) {
666 m->creds.egid = (gid_t) d->creds.egid;
667 m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask;
670 if ((gid_t) d->creds.sgid != GID_INVALID) {
671 m->creds.sgid = (gid_t) d->creds.sgid;
672 m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask;
675 if ((gid_t) d->creds.fsgid != GID_INVALID) {
676 m->creds.fsgid = (gid_t) d->creds.fsgid;
677 m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask;
682 case KDBUS_ITEM_TIMESTAMP:
683 message_set_timestamp(bus, m, &d->timestamp);
686 case KDBUS_ITEM_PID_COMM:
687 m->creds.comm = d->str;
688 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
691 case KDBUS_ITEM_TID_COMM:
692 m->creds.tid_comm = d->str;
693 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
697 m->creds.exe = d->str;
698 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
701 case KDBUS_ITEM_CMDLINE:
702 m->creds.cmdline = d->str;
703 m->creds.cmdline_size = l;
704 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
707 case KDBUS_ITEM_CGROUP:
708 m->creds.cgroup = d->str;
709 m->creds.mask |= (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID) & bus->creds_mask;
711 r = bus_get_root_path(bus);
715 m->creds.cgroup_root = bus->cgroup_root;
718 case KDBUS_ITEM_AUDIT:
719 m->creds.audit_session_id = (uint32_t) d->audit.sessionid;
720 m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask;
722 m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
723 m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask;
726 case KDBUS_ITEM_CAPS:
727 if (d->caps.last_cap != cap_last_cap() ||
728 d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) {
733 m->creds.capability = d->caps.caps;
734 m->creds.mask |= (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS) & bus->creds_mask;
737 case KDBUS_ITEM_DST_NAME:
738 if (!service_name_is_valid(d->str)) {
743 destination = d->str;
746 case KDBUS_ITEM_OWNED_NAME:
747 if (!service_name_is_valid(d->name.name)) {
752 if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
756 /* We just extend the array here, but
757 * do not allocate the strings inside
758 * of it, instead we just point to our
759 * buffer directly. */
760 n = strv_length(m->creds.well_known_names);
761 wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*));
767 wkn[n] = d->name.name;
769 m->creds.well_known_names = wkn;
771 m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
775 case KDBUS_ITEM_CONN_DESCRIPTION:
776 m->creds.description = d->str;
777 m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask;
780 case KDBUS_ITEM_AUXGROUPS:
782 if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
786 n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t);
793 for (i = 0; i < n; i++)
796 m->creds.supplementary_gids = g;
797 m->creds.n_supplementary_gids = n;
798 m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
804 case KDBUS_ITEM_SECLABEL:
805 case KDBUS_ITEM_BLOOM_FILTER:
809 log_debug("Got unknown field from kernel %llu", d->type);
813 /* If we requested the list of well-known names to be appended
814 * and the sender had none no item for it will be
815 * attached. However, this does *not* mean that the kernel
816 * didn't want to provide this information to us. Hence, let's
817 * explicitly mark this information as available if it was
819 m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
821 r = bus_message_parse_fields(m);
825 /* Refuse messages if kdbus and dbus1 cookie doesn't match up */
826 if ((uint64_t) m->header->dbus2.cookie != k->cookie) {
831 /* Refuse messages where the reply flag doesn't match up */
832 if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
837 /* Refuse reply messages where the reply cookie doesn't match up */
838 if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) {
843 /* Refuse messages where the autostart flag doesn't match up */
844 if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
849 /* Override information from the user header with data from the kernel */
850 if (k->src_id == KDBUS_SRC_ID_KERNEL)
851 bus_message_set_sender_driver(bus, m);
853 xsprintf(m->sender_buffer, ":1.%llu", k->src_id);
854 m->sender = m->creds.unique_name = m->sender_buffer;
858 m->destination = destination;
859 else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
860 m->destination = NULL;
861 else if (k->dst_id == KDBUS_DST_ID_NAME)
862 m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
864 xsprintf(m->destination_buffer, ":1.%llu", k->dst_id);
865 m->destination = m->destination_buffer;
868 /* We take possession of the kmsg struct now */
870 m->release_kdbus = true;
874 bus->rqueue[bus->rqueue_size++] = m;
880 sd_bus_message_unref(m);
885 int bus_kernel_take_fd(sd_bus *b) {
886 struct kdbus_bloom_parameter *bloom = NULL;
887 struct kdbus_item *items, *item;
888 struct kdbus_cmd_hello *hello;
889 _cleanup_free_ char *g = NULL;
891 size_t l = 0, m = 0, sz;
901 if (b->description) {
902 g = bus_label_escape(b->description);
910 /* If no name is explicitly set, we'll include a hint
911 * indicating the library implementation, a hint which
912 * kind of bus this is and the thread name */
914 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
917 name = b->is_system ? "sd-system" :
918 b->is_user ? "sd-user" : "sd";
920 _cleanup_free_ char *e = NULL;
922 e = bus_label_escape(pr);
926 g = strappend(b->is_system ? "sd-system-" :
927 b->is_user ? "sd-user-" : "sd-",
935 b->description = bus_label_unescape(name);
942 sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
943 ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
945 if (b->fake_creds_valid)
946 sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
948 if (b->fake_pids_valid)
949 sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
952 l = strlen(b->fake_label);
953 sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
956 hello = alloca0_align(sz, 8);
958 hello->flags = b->hello_flags;
959 hello->attach_flags_send = _KDBUS_ATTACH_ANY;
960 hello->attach_flags_recv = b->attach_flags;
961 hello->pool_size = KDBUS_POOL_SIZE;
965 item->size = offsetof(struct kdbus_item, str) + m + 1;
966 item->type = KDBUS_ITEM_CONN_DESCRIPTION;
967 memcpy(item->str, name, m + 1);
968 item = KDBUS_ITEM_NEXT(item);
970 if (b->fake_creds_valid) {
971 item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
972 item->type = KDBUS_ITEM_CREDS;
973 item->creds = b->fake_creds;
975 item = KDBUS_ITEM_NEXT(item);
978 if (b->fake_pids_valid) {
979 item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
980 item->type = KDBUS_ITEM_PIDS;
981 item->pids = b->fake_pids;
983 item = KDBUS_ITEM_NEXT(item);
987 item->size = offsetof(struct kdbus_item, str) + l + 1;
988 item->type = KDBUS_ITEM_SECLABEL;
989 memcpy(item->str, b->fake_label, l+1);
992 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
995 /* If the ioctl is not supported we assume that the
996 * API version changed in a major incompatible way,
997 * let's indicate an API incompatibility in this
999 return -ESOCKTNOSUPPORT;
1004 if (!b->kdbus_buffer) {
1005 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
1006 if (b->kdbus_buffer == MAP_FAILED) {
1007 b->kdbus_buffer = NULL;
1013 /* The higher 32bit of the bus_flags fields are considered
1014 * 'incompatible flags'. Refuse them all for now. */
1015 if (hello->bus_flags > 0xFFFFFFFFULL) {
1016 r = -ESOCKTNOSUPPORT;
1020 /* extract bloom parameters from items */
1021 items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
1022 KDBUS_FOREACH(item, items, hello->items_size) {
1023 switch (item->type) {
1024 case KDBUS_ITEM_BLOOM_PARAMETER:
1025 bloom = &item->bloom_parameter;
1030 if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
1035 b->bloom_size = (size_t) bloom->size;
1036 b->bloom_n_hash = (unsigned) bloom->n_hash;
1038 if (asprintf(&b->unique_name, ":1.%llu", hello->id) < 0) {
1043 b->unique_id = hello->id;
1045 b->is_kernel = true;
1046 b->bus_client = true;
1047 b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
1048 b->message_version = 2;
1049 b->message_endian = BUS_NATIVE_ENDIAN;
1051 /* the kernel told us the UUID of the underlying bus */
1052 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
1054 /* free returned items */
1055 (void) bus_kernel_cmd_free(b, hello->offset);
1056 return bus_start_running(b);
1059 (void) bus_kernel_cmd_free(b, hello->offset);
1063 int bus_kernel_connect(sd_bus *b) {
1065 assert(b->input_fd < 0);
1066 assert(b->output_fd < 0);
1072 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
1073 if (b->input_fd < 0)
1076 b->output_fd = b->input_fd;
1078 return bus_kernel_take_fd(b);
1081 int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
1082 struct kdbus_cmd_free cmd = {
1083 .size = sizeof(cmd),
1089 assert(bus->is_kernel);
1091 r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
1098 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
1099 struct kdbus_item *d;
1104 KDBUS_ITEM_FOREACH(d, k, items) {
1105 if (d->type == KDBUS_ITEM_FDS)
1106 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
1107 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
1108 safe_close(d->memfd.fd);
1111 bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
1114 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
1115 struct kdbus_cmd_send cmd = { };
1120 assert(bus->state == BUS_RUNNING);
1122 /* If we can't deliver, we want room for the error message */
1123 r = bus_rqueue_make_room(bus);
1127 r = bus_message_setup_kmsg(bus, m);
1131 cmd.size = sizeof(cmd);
1132 cmd.msg_address = (uintptr_t)m->kdbus;
1134 /* If this is a synchronous method call, then let's tell the
1135 * kernel, so that it can pass CPU time/scheduling to the
1136 * destination for the time, if it wants to. If we
1137 * synchronously wait for the result anyway, we won't need CPU
1139 if (hint_sync_call) {
1140 m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
1141 cmd.flags |= KDBUS_SEND_SYNC_REPLY;
1144 r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
1146 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1147 sd_bus_message *reply;
1149 if (errno == EAGAIN || errno == EINTR)
1151 else if (errno == ENXIO || errno == ESRCH) {
1153 /* ENXIO: unique name not known
1154 * ESRCH: well-known name not known */
1156 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1157 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
1159 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
1163 } else if (errno == EADDRNOTAVAIL) {
1165 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
1167 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1168 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
1170 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
1176 r = bus_message_new_synthetic_error(
1178 BUS_MESSAGE_COOKIE(m),
1185 r = bus_seal_synthetic_message(bus, reply);
1189 bus->rqueue[bus->rqueue_size++] = reply;
1191 } else if (hint_sync_call) {
1192 struct kdbus_msg *k;
1194 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
1197 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1199 r = bus_kernel_make_message(bus, k);
1201 close_kdbus_msg(bus, k);
1203 /* Anybody can send us invalid messages, let's just drop them. */
1204 if (r == -EBADMSG || r == -EPROTOTYPE)
1205 log_debug_errno(r, "Ignoring invalid synchronous reply: %m");
1210 log_debug("Ignoring message with unknown payload type %llu.", k->payload_type);
1211 close_kdbus_msg(bus, k);
1218 static int push_name_owner_changed(
1221 const char *old_owner,
1222 const char *new_owner,
1223 const struct kdbus_timestamp *ts) {
1225 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1230 r = sd_bus_message_new_signal(
1233 "/org/freedesktop/DBus",
1234 "org.freedesktop.DBus",
1235 "NameOwnerChanged");
1239 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
1243 bus_message_set_sender_driver(bus, m);
1244 message_set_timestamp(bus, m, ts);
1246 r = bus_seal_synthetic_message(bus, m);
1250 bus->rqueue[bus->rqueue_size++] = m;
1256 static int translate_name_change(
1258 const struct kdbus_msg *k,
1259 const struct kdbus_item *d,
1260 const struct kdbus_timestamp *ts) {
1262 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
1268 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
1271 sprintf(old_owner, ":1.%llu", d->name_change.old_id.id);
1273 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
1275 if (isempty(old_owner))
1280 sprintf(new_owner, ":1.%llu", d->name_change.new_id.id);
1282 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts);
1285 static int translate_id_change(
1287 const struct kdbus_msg *k,
1288 const struct kdbus_item *d,
1289 const struct kdbus_timestamp *ts) {
1291 char owner[UNIQUE_NAME_MAX];
1297 sprintf(owner, ":1.%llu", d->id_change.id);
1299 return push_name_owner_changed(
1301 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
1302 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL,
1306 static int translate_reply(
1308 const struct kdbus_msg *k,
1309 const struct kdbus_item *d,
1310 const struct kdbus_timestamp *ts) {
1312 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1319 r = bus_message_new_synthetic_error(
1322 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1323 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1324 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1329 message_set_timestamp(bus, m, ts);
1331 r = bus_seal_synthetic_message(bus, m);
1335 bus->rqueue[bus->rqueue_size++] = m;
1341 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1342 static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = {
1343 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1344 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1345 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1347 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1348 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1350 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1351 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1354 struct kdbus_item *d, *found = NULL;
1355 struct kdbus_timestamp *ts = NULL;
1359 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1361 KDBUS_ITEM_FOREACH(d, k, items) {
1362 if (d->type == KDBUS_ITEM_TIMESTAMP)
1364 else if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1369 log_debug("Got unknown field from kernel %llu", d->type);
1373 log_debug("Didn't find a kernel message to translate.");
1377 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts);
1380 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1381 struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
1382 struct kdbus_msg *k;
1387 r = bus_rqueue_make_room(bus);
1391 if (hint_priority) {
1392 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1393 recv.priority = priority;
1396 r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
1397 if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
1398 log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
1400 if (errno == EAGAIN)
1406 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset);
1407 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1408 r = bus_kernel_make_message(bus, k);
1410 /* Anybody can send us invalid messages, let's just drop them. */
1411 if (r == -EBADMSG || r == -EPROTOTYPE) {
1412 log_debug_errno(r, "Ignoring invalid message: %m");
1417 close_kdbus_msg(bus, k);
1418 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) {
1419 r = bus_kernel_translate_message(bus, k);
1420 close_kdbus_msg(bus, k);
1422 log_debug("Ignoring message with unknown payload type %llu.", k->payload_type);
1424 close_kdbus_msg(bus, k);
1427 return r < 0 ? r : 1;
1430 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1431 struct memfd_cache *c;
1438 if (!bus || !bus->is_kernel)
1441 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0);
1443 if (bus->n_memfd_cache <= 0) {
1446 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
1448 r = memfd_new(bus->description);
1458 c = &bus->memfd_cache[--bus->n_memfd_cache];
1461 assert(c->mapped == 0 || c->address);
1463 *address = c->address;
1464 *mapped = c->mapped;
1465 *allocated = c->allocated;
1468 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
1473 static void close_and_munmap(int fd, void *address, size_t size) {
1475 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1480 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1481 struct memfd_cache *c;
1482 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1485 assert(mapped == 0 || address);
1487 if (!bus || !bus->is_kernel) {
1488 close_and_munmap(fd, address, mapped);
1492 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0);
1494 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1495 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
1497 close_and_munmap(fd, address, mapped);
1501 c = &bus->memfd_cache[bus->n_memfd_cache++];
1503 c->address = address;
1505 /* If overly long, let's return a bit to the OS */
1506 if (mapped > max_mapped) {
1507 assert_se(memfd_set_size(fd, max_mapped) >= 0);
1508 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1509 c->mapped = c->allocated = max_mapped;
1512 c->allocated = allocated;
1515 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
1518 void bus_kernel_flush_memfd(sd_bus *b) {
1523 for (i = 0; i < b->n_memfd_cache; i++)
1524 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1527 uint64_t request_name_flags_to_kdbus(uint64_t flags) {
1530 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1531 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1533 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1534 f |= KDBUS_NAME_REPLACE_EXISTING;
1536 if (flags & SD_BUS_NAME_QUEUE)
1537 f |= KDBUS_NAME_QUEUE;
1542 uint64_t attach_flags_to_kdbus(uint64_t mask) {
1545 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
1546 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
1547 m |= KDBUS_ATTACH_CREDS;
1549 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID))
1550 m |= KDBUS_ATTACH_PIDS;
1552 if (mask & SD_BUS_CREDS_COMM)
1553 m |= KDBUS_ATTACH_PID_COMM;
1555 if (mask & SD_BUS_CREDS_TID_COMM)
1556 m |= KDBUS_ATTACH_TID_COMM;
1558 if (mask & SD_BUS_CREDS_EXE)
1559 m |= KDBUS_ATTACH_EXE;
1561 if (mask & SD_BUS_CREDS_CMDLINE)
1562 m |= KDBUS_ATTACH_CMDLINE;
1564 if (mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID))
1565 m |= KDBUS_ATTACH_CGROUP;
1567 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1568 m |= KDBUS_ATTACH_CAPS;
1570 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1571 m |= KDBUS_ATTACH_SECLABEL;
1573 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1574 m |= KDBUS_ATTACH_AUDIT;
1576 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1577 m |= KDBUS_ATTACH_NAMES;
1579 if (mask & SD_BUS_CREDS_DESCRIPTION)
1580 m |= KDBUS_ATTACH_CONN_DESCRIPTION;
1582 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
1583 m |= KDBUS_ATTACH_AUXGROUPS;
1588 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1589 struct kdbus_cmd *make;
1590 struct kdbus_item *n;
1597 fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1602 make = alloca0_align(offsetof(struct kdbus_cmd, items) +
1603 ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
1604 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1605 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
1608 make->size = offsetof(struct kdbus_cmd, items);
1610 /* Set the bloom parameters */
1612 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1613 sizeof(struct kdbus_bloom_parameter);
1614 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1615 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1616 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1618 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1619 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1621 make->size += ALIGN8(n->size);
1623 /* Provide all metadata via bus-owner queries */
1624 n = KDBUS_ITEM_NEXT(n);
1625 n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
1626 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1627 n->data64[0] = _KDBUS_ATTACH_ANY;
1628 make->size += ALIGN8(n->size);
1630 /* Set the a good name */
1631 n = KDBUS_ITEM_NEXT(n);
1632 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1633 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1634 n->type = KDBUS_ITEM_MAKE_NAME;
1635 make->size += ALIGN8(n->size);
1637 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1639 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1642 /* Major API change? then the ioctls got shuffled around. */
1643 if (errno == ENOTTY)
1644 return -ESOCKTNOSUPPORT;
1652 p = strjoin("/sys/fs/kdbus/", n->str, "/bus");
1664 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1671 len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1678 p = newa(char, len);
1680 sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1682 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1696 int bus_kernel_try_close(sd_bus *bus) {
1697 struct kdbus_cmd byebye = { .size = sizeof(byebye) };
1700 assert(bus->is_kernel);
1702 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0)
1708 #if 0 /// UNNEEDED by elogind
1709 int bus_kernel_drop_one(int fd) {
1710 struct kdbus_cmd_recv recv = {
1711 .size = sizeof(recv),
1712 .flags = KDBUS_RECV_DROP,
1717 if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
1724 int bus_kernel_realize_attach_flags(sd_bus *bus) {
1725 struct kdbus_cmd *update;
1726 struct kdbus_item *n;
1729 assert(bus->is_kernel);
1731 update = alloca0_align(offsetof(struct kdbus_cmd, items) +
1732 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
1736 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1737 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1738 n->data64[0] = bus->attach_flags;
1741 offsetof(struct kdbus_cmd, items) +
1744 if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0)
1750 int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
1751 struct kdbus_cmd_info cmd = {
1752 .size = sizeof(struct kdbus_cmd_info),
1754 struct kdbus_info *info;
1755 struct kdbus_item *item;
1761 assert(bus->is_kernel);
1763 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
1767 info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
1769 KDBUS_ITEM_FOREACH(item, info, items)
1770 if (item->type == KDBUS_ITEM_MAKE_NAME) {
1771 r = free_and_strdup(&n, item->str);
1775 bus_kernel_cmd_free(bus, cmd.offset);