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 #ifdef HAVE_VALGRIND_MEMCHECK_H
23 #include <valgrind/memcheck.h>
29 #include <sys/prctl.h>
31 /* When we include libgen.h because we need dirname() we immediately
32 * undefine basename() since libgen.h defines it as a macro to the XDG
33 * version which is really broken. */
39 #include "memfd-util.h"
40 #include "capability.h"
42 #include "formats-util.h"
44 #include "bus-internal.h"
45 #include "bus-message.h"
46 #include "bus-kernel.h"
47 #include "bus-bloom.h"
49 #include "bus-label.h"
51 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
53 int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
59 if (!startswith(s, ":1."))
62 r = safe_atou64(s + 3, id);
69 static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
75 /* Note that p can be NULL, which encodes a region full of
76 * zeroes, which is useful to optimize certain padding
79 (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
80 (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
81 (*d)->vec.address = PTR_TO_UINT64(p);
84 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
87 static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) {
93 (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
94 (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
95 (*d)->memfd.fd = memfd;
96 (*d)->memfd.start = start;
97 (*d)->memfd.size = sz;
99 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
102 static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
108 (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
109 (*d)->type = KDBUS_ITEM_DST_NAME;
110 memcpy((*d)->str, s, length + 1);
112 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
115 static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
116 struct kdbus_item *i;
122 i->size = offsetof(struct kdbus_item, bloom_filter) +
123 offsetof(struct kdbus_bloom_filter, data) +
125 i->type = KDBUS_ITEM_BLOOM_FILTER;
127 *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
129 return &i->bloom_filter;
132 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
138 (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
139 (*d)->type = KDBUS_ITEM_FDS;
140 memcpy((*d)->fds, fds, sizeof(int) * n_fds);
142 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
145 static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) {
146 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
154 e = stpcpy(buf, "arg");
156 *(e++) = '0' + (char) i;
158 *(e++) = '0' + (char) (i / 10);
159 *(e++) = '0' + (char) (i % 10);
163 bloom_add_pair(data, size, n_hash, buf, t);
165 strcpy(e, "-dot-prefix");
166 bloom_add_prefixes(data, size, n_hash, buf, t, '.');
167 strcpy(e, "-slash-prefix");
168 bloom_add_prefixes(data, size, n_hash, buf, t, '/');
171 static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
180 memzero(data, m->bus->bloom_size);
181 bloom->generation = 0;
183 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
186 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
188 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
190 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
191 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
192 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
195 r = sd_bus_message_rewind(m, true);
199 for (i = 0; i < 64; i++) {
200 const char *t, *contents;
203 r = sd_bus_message_peek_type(m, &type, &contents);
207 if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) {
209 /* The bloom filter includes simple strings of any kind */
210 r = sd_bus_message_read_basic(m, type, &t);
214 add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
215 } if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) {
217 /* As well as array of simple strings of any kinds */
218 r = sd_bus_message_enter_container(m, type, contents);
222 while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0)
223 add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
227 r = sd_bus_message_exit_container(m);
232 /* Stop adding to bloom filter as soon as we
233 * run into the first argument we cannot add
241 static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
242 struct bus_body_part *part;
243 struct kdbus_item *d;
244 const char *destination;
255 /* We put this together only once, if this message is reused
256 * we reuse the earlier-built version */
260 destination = m->destination ?: m->destination_ptr;
263 r = bus_kernel_parse_unique_name(destination, &unique);
271 sz = offsetof(struct kdbus_msg, items);
273 /* Add in fixed header, fields header and payload */
274 sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) +
275 MAX(sizeof(struct kdbus_vec),
276 sizeof(struct kdbus_memfd)));
278 /* Add space for bloom filter */
279 sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
280 offsetof(struct kdbus_bloom_filter, data) +
283 /* Add in well-known destination header */
285 dl = strlen(destination);
286 sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
289 /* Add space for unix fds */
291 sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
293 m->kdbus = memalign(8, sz);
299 m->free_kdbus = true;
300 memzero(m->kdbus, sz);
303 ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) |
304 ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) |
305 ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0);
308 /* verify_destination_id will usually be 0, which makes the kernel driver only look
309 * at the provided well-known name. Otherwise, the kernel will make sure the provided
310 * destination id matches the owner of the provided weel-known-name, and fail if they
311 * differ. Currently, this is only needed for bus-proxyd. */
312 m->kdbus->dst_id = m->verify_destination_id;
314 m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST;
316 m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
317 m->kdbus->cookie = m->header->dbus2.cookie;
318 m->kdbus->priority = m->priority;
320 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
321 m->kdbus->cookie_reply = m->reply_cookie;
325 assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0);
326 m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec +
327 m->timeout * NSEC_PER_USEC;
333 append_destination(&d, destination, dl);
335 append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
337 MESSAGE_FOREACH_PART(part, i, m) {
339 /* If this is padding then simply send a
340 * vector with a NULL data pointer which the
341 * kernel will just pass through. This is the
342 * most efficient way to encode zeroes */
344 append_payload_vec(&d, NULL, part->size);
348 if (part->memfd >= 0 && part->sealed && destination) {
349 /* Try to send a memfd, if the part is
350 * sealed and this is not a broadcast. Since we can only */
352 append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size);
356 /* Otherwise, let's send a vector to the actual data.
357 * For that, we need to map it first. */
358 r = bus_body_part_map(part);
362 append_payload_vec(&d, part->data, part->size);
365 if (m->header->type == SD_BUS_MESSAGE_SIGNAL) {
366 struct kdbus_bloom_filter *bloom;
368 bloom = append_bloom(&d, m->bus->bloom_size);
369 r = bus_message_setup_bloom(m, bloom);
375 append_fds(&d, m->fds, m->n_fds);
377 m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
378 assert(m->kdbus->size <= sz);
387 static void unset_memfds(struct sd_bus_message *m) {
388 struct bus_body_part *part;
393 /* Make sure the memfds are not freed twice */
394 MESSAGE_FOREACH_PART(part, i, m)
395 if (part->memfd >= 0)
399 static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) {
406 if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP))
409 m->realtime = ts->realtime_ns / NSEC_PER_USEC;
410 m->monotonic = ts->monotonic_ns / NSEC_PER_USEC;
411 m->seqnum = ts->seqnum;
414 static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
415 sd_bus_message *m = NULL;
416 struct kdbus_item *d;
418 _cleanup_free_ int *fds = NULL;
419 struct bus_header *header = NULL;
421 size_t header_size = 0, footer_size = 0;
422 size_t n_bytes = 0, idx = 0;
423 const char *destination = NULL, *seclabel = NULL;
424 bool last_was_memfd = false;
429 assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
431 KDBUS_ITEM_FOREACH(d, k, items) {
434 l = d->size - offsetof(struct kdbus_item, data);
438 case KDBUS_ITEM_PAYLOAD_OFF:
440 header = (struct bus_header*)((uint8_t*) k + d->vec.offset);
441 header_size = d->vec.size;
444 footer = (uint8_t*) k + d->vec.offset;
445 footer_size = d->vec.size;
447 n_bytes += d->vec.size;
448 last_was_memfd = false;
451 case KDBUS_ITEM_PAYLOAD_MEMFD:
452 if (!header) /* memfd cannot be first part */
455 n_bytes += d->memfd.size;
456 last_was_memfd = true;
459 case KDBUS_ITEM_FDS: {
464 f = realloc(fds, sizeof(int) * (n_fds + j));
469 memcpy(fds + n_fds, d->fds, sizeof(int) * j);
474 case KDBUS_ITEM_SECLABEL:
480 if (last_was_memfd) /* memfd cannot be last part */
486 if (header_size < sizeof(struct bus_header))
489 /* on kdbus we only speak native endian gvariant, never dbus1
490 * marshalling or reverse endian */
491 if (header->version != 2 ||
492 header->endian != BUS_NATIVE_ENDIAN)
495 r = bus_message_from_header(
506 /* The well-known names list is different from the other
507 credentials. If we asked for it, but nothing is there, this
508 means that the list of well-known names is simply empty, not
509 that we lack any data */
511 m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
513 KDBUS_ITEM_FOREACH(d, k, items) {
516 l = d->size - offsetof(struct kdbus_item, data);
520 case KDBUS_ITEM_PAYLOAD_OFF: {
523 begin_body = BUS_MESSAGE_BODY_BEGIN(m);
525 if (idx + d->vec.size > begin_body) {
526 struct bus_body_part *part;
528 /* Contains body material */
530 part = message_append_part(m);
536 /* A -1 offset is NUL padding. */
537 part->is_zero = d->vec.offset == ~0ULL;
539 if (idx >= begin_body) {
541 part->data = (uint8_t* )k + d->vec.offset;
542 part->size = d->vec.size;
545 part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx);
546 part->size = d->vec.size - (begin_body - idx);
556 case KDBUS_ITEM_PAYLOAD_MEMFD: {
557 struct bus_body_part *part;
559 if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
564 part = message_append_part(m);
570 part->memfd = d->memfd.fd;
571 part->memfd_offset = d->memfd.start;
572 part->size = d->memfd.size;
575 idx += d->memfd.size;
579 case KDBUS_ITEM_PIDS:
581 /* The PID/TID might be missing, when the data
582 * is faked by a bus proxy and it lacks that
583 * information about the real client (since
584 * SO_PEERCRED is used for that). Also kernel
585 * namespacing might make some of this data
586 * unavailable when untranslatable. */
588 if (d->pids.pid > 0) {
589 m->creds.pid = (pid_t) d->pids.pid;
590 m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask;
593 if (d->pids.tid > 0) {
594 m->creds.tid = (pid_t) d->pids.tid;
595 m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
600 case KDBUS_ITEM_CREDS:
602 /* EUID/SUID/FSUID/EGID/SGID/FSGID might be
603 * missing too (see above). */
605 if ((uid_t) d->creds.uid != UID_INVALID) {
606 m->creds.uid = (uid_t) d->creds.uid;
607 m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask;
610 if ((uid_t) d->creds.euid != UID_INVALID) {
611 m->creds.euid = (uid_t) d->creds.euid;
612 m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask;
615 if ((uid_t) d->creds.suid != UID_INVALID) {
616 m->creds.suid = (uid_t) d->creds.suid;
617 m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask;
620 if ((uid_t) d->creds.fsuid != UID_INVALID) {
621 m->creds.fsuid = (uid_t) d->creds.fsuid;
622 m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask;
625 if ((gid_t) d->creds.gid != GID_INVALID) {
626 m->creds.gid = (gid_t) d->creds.gid;
627 m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask;
630 if ((gid_t) d->creds.egid != GID_INVALID) {
631 m->creds.egid = (gid_t) d->creds.egid;
632 m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask;
635 if ((gid_t) d->creds.sgid != GID_INVALID) {
636 m->creds.sgid = (gid_t) d->creds.sgid;
637 m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask;
640 if ((gid_t) d->creds.fsgid != GID_INVALID) {
641 m->creds.fsgid = (gid_t) d->creds.fsgid;
642 m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask;
647 case KDBUS_ITEM_TIMESTAMP:
648 message_set_timestamp(bus, m, &d->timestamp);
651 case KDBUS_ITEM_PID_COMM:
652 m->creds.comm = d->str;
653 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
656 case KDBUS_ITEM_TID_COMM:
657 m->creds.tid_comm = d->str;
658 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
662 m->creds.exe = d->str;
663 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
666 case KDBUS_ITEM_CMDLINE:
667 m->creds.cmdline = d->str;
668 m->creds.cmdline_size = l;
669 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
672 case KDBUS_ITEM_CGROUP:
673 m->creds.cgroup = d->str;
674 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;
676 r = bus_get_root_path(bus);
680 m->creds.cgroup_root = bus->cgroup_root;
683 case KDBUS_ITEM_AUDIT:
684 if ((uint32_t) d->audit.sessionid != (uint32_t) -1) {
685 m->creds.audit_session_id = (uint32_t) d->audit.sessionid;
686 m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask;
689 if ((uid_t) d->audit.loginuid != UID_INVALID) {
690 m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
691 m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask;
695 case KDBUS_ITEM_CAPS:
696 if (d->caps.last_cap != cap_last_cap() ||
697 d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) {
702 m->creds.capability = d->caps.caps;
703 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;
706 case KDBUS_ITEM_DST_NAME:
707 if (!service_name_is_valid(d->str)) {
712 destination = d->str;
715 case KDBUS_ITEM_OWNED_NAME:
716 if (!service_name_is_valid(d->name.name)) {
721 if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
725 /* We just extend the array here, but
726 * do not allocate the strings inside
727 * of it, instead we just point to our
728 * buffer directly. */
729 n = strv_length(m->creds.well_known_names);
730 wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*));
736 wkn[n] = d->name.name;
738 m->creds.well_known_names = wkn;
740 m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
744 case KDBUS_ITEM_CONN_DESCRIPTION:
745 m->creds.description = d->str;
746 m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask;
749 case KDBUS_ITEM_AUXGROUPS:
751 if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
755 n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t);
762 for (i = 0; i < n; i++)
765 m->creds.supplementary_gids = g;
766 m->creds.n_supplementary_gids = n;
767 m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
773 case KDBUS_ITEM_SECLABEL:
777 log_debug("Got unknown field from kernel %llu", d->type);
781 /* If we requested the list of well-known names to be appended
782 * and the sender had none no item for it will be
783 * attached. However, this does *not* mean that the kernel
784 * didn't want to provide this information to us. Hence, let's
785 * explicitly mark this information as available if it was
787 m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
789 r = bus_message_parse_fields(m);
793 /* Refuse messages if kdbus and dbus1 cookie doesn't match up */
794 if ((uint64_t) m->header->dbus2.cookie != k->cookie) {
799 /* Refuse messages where the reply flag doesn't match up */
800 if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
805 /* Refuse reply messages where the reply cookie doesn't match up */
806 if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) {
811 /* Refuse messages where the autostart flag doesn't match up */
812 if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
817 /* Override information from the user header with data from the kernel */
818 if (k->src_id == KDBUS_SRC_ID_KERNEL)
819 bus_message_set_sender_driver(bus, m);
821 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
822 m->sender = m->creds.unique_name = m->sender_buffer;
826 m->destination = destination;
827 else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
828 m->destination = NULL;
829 else if (k->dst_id == KDBUS_DST_ID_NAME)
830 m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
832 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
833 m->destination = m->destination_buffer;
836 /* We take possession of the kmsg struct now */
838 m->release_kdbus = true;
842 bus->rqueue[bus->rqueue_size++] = m;
848 sd_bus_message_unref(m);
853 int bus_kernel_take_fd(sd_bus *b) {
854 struct kdbus_bloom_parameter *bloom = NULL;
855 struct kdbus_item *items, *item;
856 struct kdbus_cmd_hello *hello;
857 _cleanup_free_ char *g = NULL;
859 size_t l = 0, m = 0, sz;
869 if (b->description) {
870 g = bus_label_escape(b->description);
878 /* If no name is explicitly set, we'll include a hint
879 * indicating the library implementation, a hint which
880 * kind of bus this is and the thread name */
882 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
885 name = b->is_system ? "sd-system" :
886 b->is_user ? "sd-user" : "sd";
888 _cleanup_free_ char *e = NULL;
890 e = bus_label_escape(pr);
894 g = strappend(b->is_system ? "sd-system-" :
895 b->is_user ? "sd-user-" : "sd-",
903 b->description = bus_label_unescape(name);
910 sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
911 ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
913 if (b->fake_creds_valid)
914 sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
916 if (b->fake_pids_valid)
917 sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
920 l = strlen(b->fake_label);
921 sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
924 hello = alloca0_align(sz, 8);
926 hello->flags = b->hello_flags;
927 hello->attach_flags_send = _KDBUS_ATTACH_ANY;
928 hello->attach_flags_recv = b->attach_flags;
929 hello->pool_size = KDBUS_POOL_SIZE;
933 item->size = offsetof(struct kdbus_item, str) + m + 1;
934 item->type = KDBUS_ITEM_CONN_DESCRIPTION;
935 memcpy(item->str, name, m + 1);
936 item = KDBUS_ITEM_NEXT(item);
938 if (b->fake_creds_valid) {
939 item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
940 item->type = KDBUS_ITEM_CREDS;
941 item->creds = b->fake_creds;
943 item = KDBUS_ITEM_NEXT(item);
946 if (b->fake_pids_valid) {
947 item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
948 item->type = KDBUS_ITEM_PIDS;
949 item->pids = b->fake_pids;
951 item = KDBUS_ITEM_NEXT(item);
955 item->size = offsetof(struct kdbus_item, str) + l + 1;
956 item->type = KDBUS_ITEM_SECLABEL;
957 memcpy(item->str, b->fake_label, l+1);
960 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
964 if (!b->kdbus_buffer) {
965 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
966 if (b->kdbus_buffer == MAP_FAILED) {
967 b->kdbus_buffer = NULL;
973 /* The higher 32bit of the bus_flags fields are considered
974 * 'incompatible flags'. Refuse them all for now. */
975 if (hello->bus_flags > 0xFFFFFFFFULL) {
980 /* extract bloom parameters from items */
981 items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
982 KDBUS_FOREACH(item, items, hello->items_size) {
983 switch (item->type) {
984 case KDBUS_ITEM_BLOOM_PARAMETER:
985 bloom = &item->bloom_parameter;
990 if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
995 b->bloom_size = (size_t) bloom->size;
996 b->bloom_n_hash = (unsigned) bloom->n_hash;
998 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
1003 b->unique_id = hello->id;
1005 b->is_kernel = true;
1006 b->bus_client = true;
1007 b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
1008 b->message_version = 2;
1009 b->message_endian = BUS_NATIVE_ENDIAN;
1011 /* the kernel told us the UUID of the underlying bus */
1012 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
1014 /* free returned items */
1015 (void) bus_kernel_cmd_free(b, hello->offset);
1016 return bus_start_running(b);
1019 (void) bus_kernel_cmd_free(b, hello->offset);
1023 int bus_kernel_connect(sd_bus *b) {
1025 assert(b->input_fd < 0);
1026 assert(b->output_fd < 0);
1032 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
1033 if (b->input_fd < 0)
1036 b->output_fd = b->input_fd;
1038 return bus_kernel_take_fd(b);
1041 int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
1042 struct kdbus_cmd_free cmd = {
1043 .size = sizeof(cmd),
1049 assert(bus->is_kernel);
1051 r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
1058 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
1059 struct kdbus_item *d;
1064 KDBUS_ITEM_FOREACH(d, k, items) {
1065 if (d->type == KDBUS_ITEM_FDS)
1066 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
1067 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
1068 safe_close(d->memfd.fd);
1071 bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
1074 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
1075 struct kdbus_cmd_send cmd = { };
1080 assert(bus->state == BUS_RUNNING);
1082 /* If we can't deliver, we want room for the error message */
1083 r = bus_rqueue_make_room(bus);
1087 r = bus_message_setup_kmsg(bus, m);
1091 cmd.size = sizeof(cmd);
1092 cmd.msg_address = (uintptr_t)m->kdbus;
1094 /* If this is a synchronous method call, then let's tell the
1095 * kernel, so that it can pass CPU time/scheduling to the
1096 * destination for the time, if it wants to. If we
1097 * synchronously wait for the result anyway, we won't need CPU
1099 if (hint_sync_call) {
1100 m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
1101 cmd.flags |= KDBUS_SEND_SYNC_REPLY;
1104 r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
1106 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1107 sd_bus_message *reply;
1109 if (errno == EAGAIN || errno == EINTR)
1111 else if (errno == ENXIO || errno == ESRCH) {
1113 /* ENXIO: unique name not known
1114 * ESRCH: well-known name not known */
1116 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1117 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
1119 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
1123 } else if (errno == EADDRNOTAVAIL) {
1125 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
1127 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1128 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
1130 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
1136 r = bus_message_new_synthetic_error(
1138 BUS_MESSAGE_COOKIE(m),
1145 r = bus_seal_synthetic_message(bus, reply);
1149 bus->rqueue[bus->rqueue_size++] = reply;
1151 } else if (hint_sync_call) {
1152 struct kdbus_msg *k;
1154 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
1157 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1159 r = bus_kernel_make_message(bus, k);
1161 close_kdbus_msg(bus, k);
1163 /* Anybody can send us invalid messages, let's just drop them. */
1164 if (r == -EBADMSG || r == -EPROTOTYPE)
1165 log_debug_errno(r, "Ignoring invalid synchronous reply: %m");
1170 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1171 close_kdbus_msg(bus, k);
1178 static int push_name_owner_changed(
1181 const char *old_owner,
1182 const char *new_owner,
1183 const struct kdbus_timestamp *ts) {
1185 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1190 r = sd_bus_message_new_signal(
1193 "/org/freedesktop/DBus",
1194 "org.freedesktop.DBus",
1195 "NameOwnerChanged");
1199 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
1203 bus_message_set_sender_driver(bus, m);
1204 message_set_timestamp(bus, m, ts);
1206 r = bus_seal_synthetic_message(bus, m);
1210 bus->rqueue[bus->rqueue_size++] = m;
1216 static int translate_name_change(
1218 const struct kdbus_msg *k,
1219 const struct kdbus_item *d,
1220 const struct kdbus_timestamp *ts) {
1222 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
1228 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
1231 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
1233 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
1235 if (isempty(old_owner))
1240 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
1242 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts);
1245 static int translate_id_change(
1247 const struct kdbus_msg *k,
1248 const struct kdbus_item *d,
1249 const struct kdbus_timestamp *ts) {
1251 char owner[UNIQUE_NAME_MAX];
1257 sprintf(owner, ":1.%llu", d->id_change.id);
1259 return push_name_owner_changed(
1261 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
1262 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL,
1266 static int translate_reply(
1268 const struct kdbus_msg *k,
1269 const struct kdbus_item *d,
1270 const struct kdbus_timestamp *ts) {
1272 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1279 r = bus_message_new_synthetic_error(
1282 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1283 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1284 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1289 message_set_timestamp(bus, m, ts);
1291 r = bus_seal_synthetic_message(bus, m);
1295 bus->rqueue[bus->rqueue_size++] = m;
1301 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1302 static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = {
1303 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1304 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1305 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1307 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1308 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1310 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1311 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1314 struct kdbus_item *d, *found = NULL;
1315 struct kdbus_timestamp *ts = NULL;
1319 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1321 KDBUS_ITEM_FOREACH(d, k, items) {
1322 if (d->type == KDBUS_ITEM_TIMESTAMP)
1325 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1330 log_debug("Got unknown field from kernel %llu", d->type);
1334 log_debug("Didn't find a kernel message to translate.");
1338 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts);
1341 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1342 struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
1343 struct kdbus_msg *k;
1348 r = bus_rqueue_make_room(bus);
1352 if (hint_priority) {
1353 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1354 recv.priority = priority;
1357 r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
1358 if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
1359 log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
1361 if (errno == EAGAIN)
1367 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset);
1368 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1369 r = bus_kernel_make_message(bus, k);
1371 /* Anybody can send us invalid messages, let's just drop them. */
1372 if (r == -EBADMSG || r == -EPROTOTYPE) {
1373 log_debug_errno(r, "Ignoring invalid message: %m");
1377 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
1378 r = bus_kernel_translate_message(bus, k);
1380 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1385 close_kdbus_msg(bus, k);
1387 return r < 0 ? r : 1;
1390 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1391 struct memfd_cache *c;
1398 if (!bus || !bus->is_kernel)
1401 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1403 if (bus->n_memfd_cache <= 0) {
1406 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1408 r = memfd_new(bus->description);
1418 c = &bus->memfd_cache[--bus->n_memfd_cache];
1421 assert(c->mapped == 0 || c->address);
1423 *address = c->address;
1424 *mapped = c->mapped;
1425 *allocated = c->allocated;
1428 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1433 static void close_and_munmap(int fd, void *address, size_t size) {
1435 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1440 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1441 struct memfd_cache *c;
1442 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1445 assert(mapped == 0 || address);
1447 if (!bus || !bus->is_kernel) {
1448 close_and_munmap(fd, address, mapped);
1452 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1454 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1455 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1457 close_and_munmap(fd, address, mapped);
1461 c = &bus->memfd_cache[bus->n_memfd_cache++];
1463 c->address = address;
1465 /* If overly long, let's return a bit to the OS */
1466 if (mapped > max_mapped) {
1467 assert_se(memfd_set_size(fd, max_mapped) >= 0);
1468 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1469 c->mapped = c->allocated = max_mapped;
1472 c->allocated = allocated;
1475 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1478 void bus_kernel_flush_memfd(sd_bus *b) {
1483 for (i = 0; i < b->n_memfd_cache; i++)
1484 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1487 uint64_t request_name_flags_to_kdbus(uint64_t flags) {
1490 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1491 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1493 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1494 f |= KDBUS_NAME_REPLACE_EXISTING;
1496 if (flags & SD_BUS_NAME_QUEUE)
1497 f |= KDBUS_NAME_QUEUE;
1502 uint64_t attach_flags_to_kdbus(uint64_t mask) {
1505 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
1506 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
1507 m |= KDBUS_ATTACH_CREDS;
1509 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID))
1510 m |= KDBUS_ATTACH_PIDS;
1512 if (mask & SD_BUS_CREDS_COMM)
1513 m |= KDBUS_ATTACH_PID_COMM;
1515 if (mask & SD_BUS_CREDS_TID_COMM)
1516 m |= KDBUS_ATTACH_TID_COMM;
1518 if (mask & SD_BUS_CREDS_EXE)
1519 m |= KDBUS_ATTACH_EXE;
1521 if (mask & SD_BUS_CREDS_CMDLINE)
1522 m |= KDBUS_ATTACH_CMDLINE;
1524 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))
1525 m |= KDBUS_ATTACH_CGROUP;
1527 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1528 m |= KDBUS_ATTACH_CAPS;
1530 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1531 m |= KDBUS_ATTACH_SECLABEL;
1533 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1534 m |= KDBUS_ATTACH_AUDIT;
1536 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1537 m |= KDBUS_ATTACH_NAMES;
1539 if (mask & SD_BUS_CREDS_DESCRIPTION)
1540 m |= KDBUS_ATTACH_CONN_DESCRIPTION;
1542 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
1543 m |= KDBUS_ATTACH_AUXGROUPS;
1548 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1549 struct kdbus_cmd *make;
1550 struct kdbus_item *n;
1557 fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1562 make = alloca0_align(offsetof(struct kdbus_cmd, items) +
1563 ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
1564 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1565 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1566 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
1569 make->size = offsetof(struct kdbus_cmd, items);
1571 /* Set the bloom parameters */
1573 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1574 sizeof(struct kdbus_bloom_parameter);
1575 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1576 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1577 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1579 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1580 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1582 make->size += ALIGN8(n->size);
1584 /* The busses we create make no restrictions on what metadata
1585 * peers can read from incoming messages. */
1586 n = KDBUS_ITEM_NEXT(n);
1587 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1588 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1589 n->data64[0] = _KDBUS_ATTACH_ANY;
1590 make->size += ALIGN8(n->size);
1592 /* Provide all metadata via bus-owner queries */
1593 n = KDBUS_ITEM_NEXT(n);
1594 n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
1595 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1596 n->data64[0] = _KDBUS_ATTACH_ANY;
1597 make->size += ALIGN8(n->size);
1599 /* Set the a good name */
1600 n = KDBUS_ITEM_NEXT(n);
1601 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1602 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1603 n->type = KDBUS_ITEM_MAKE_NAME;
1604 make->size += ALIGN8(n->size);
1606 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1608 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1616 p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
1628 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1635 len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1642 p = newa(char, len);
1644 sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1646 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1660 int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
1661 _cleanup_free_ char *path = NULL;
1662 struct kdbus_cmd *make;
1663 struct kdbus_item *n;
1667 fd = bus_kernel_open_bus_fd(bus_name, &path);
1671 make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) +
1672 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1),
1674 make->size = ALIGN8(offsetof(struct kdbus_cmd, items));
1675 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1678 sprintf(n->str, UID_FMT "-%s", getuid(), ep_name);
1679 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1680 n->type = KDBUS_ITEM_MAKE_NAME;
1681 make->size += ALIGN8(n->size);
1684 if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
1692 p = strjoin(dirname(path), "/", name, NULL);
1704 int bus_kernel_try_close(sd_bus *bus) {
1705 struct kdbus_cmd byebye = { .size = sizeof(byebye) };
1708 assert(bus->is_kernel);
1710 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0)
1716 int bus_kernel_drop_one(int fd) {
1717 struct kdbus_cmd_recv recv = {
1718 .size = sizeof(recv),
1719 .flags = KDBUS_RECV_DROP,
1724 if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
1730 int bus_kernel_realize_attach_flags(sd_bus *bus) {
1731 struct kdbus_cmd *update;
1732 struct kdbus_item *n;
1735 assert(bus->is_kernel);
1737 update = alloca0_align(offsetof(struct kdbus_cmd, items) +
1738 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
1742 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1743 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1744 n->data64[0] = bus->attach_flags;
1747 offsetof(struct kdbus_cmd, items) +
1750 if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0)
1756 int bus_kernel_fix_attach_mask(void) {
1757 _cleanup_free_ char *mask = NULL;
1758 uint64_t m = (uint64_t) -1;
1762 /* By default we don't want any kdbus metadata fields to be
1763 * suppressed, hence we reset the kernel mask for it to
1764 * (uint64_t) -1. If the module argument was overwritten by
1765 * the kernel cmdline, we leave it as is. */
1767 r = get_proc_cmdline_key("kdbus.attach_flags_mask=", &mask);
1769 return log_warning_errno(r, "Failed to read kernel command line: %m");
1772 sprintf(buf, "0x%" PRIx64 "\n", m);
1773 r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
1775 return log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
1776 "Failed to write kdbus attach mask: %m");
1782 int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
1783 struct kdbus_cmd_info cmd = {
1784 .size = sizeof(struct kdbus_cmd_info),
1786 struct kdbus_info *info;
1787 struct kdbus_item *item;
1793 assert(bus->is_kernel);
1795 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
1799 info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
1801 KDBUS_ITEM_FOREACH(item, info, items)
1802 if (item->type == KDBUS_ITEM_MAKE_NAME) {
1803 r = free_and_strdup(&n, item->str);
1807 bus_kernel_cmd_free(bus, cmd.offset);