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"
41 #include "cgroup-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) {
752 assert_cc(sizeof(gid_t) == sizeof(uint32_t));
754 m->creds.n_supplementary_gids = (d->size - offsetof(struct kdbus_item, data32)) / sizeof(uint32_t);
755 m->creds.supplementary_gids = (gid_t*) d->data32;
756 m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
762 case KDBUS_ITEM_SECLABEL:
766 log_debug("Got unknown field from kernel %llu", d->type);
770 /* If we requested the list of well-known names to be appended
771 * and the sender had none no item for it will be
772 * attached. However, this does *not* mean that the kernel
773 * didn't want to provide this information to us. Hence, let's
774 * explicitly mark this information as available if it was
776 m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
778 r = bus_message_parse_fields(m);
782 /* Refuse messages if kdbus and dbus1 cookie doesn't match up */
783 if ((uint64_t) m->header->dbus2.cookie != k->cookie) {
788 /* Refuse messages where the reply flag doesn't match up */
789 if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
794 /* Refuse reply messages where the reply cookie doesn't match up */
795 if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) {
800 /* Refuse messages where the autostart flag doesn't match up */
801 if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
806 /* Override information from the user header with data from the kernel */
807 if (k->src_id == KDBUS_SRC_ID_KERNEL)
808 bus_message_set_sender_driver(bus, m);
810 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
811 m->sender = m->creds.unique_name = m->sender_buffer;
815 m->destination = destination;
816 else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
817 m->destination = NULL;
818 else if (k->dst_id == KDBUS_DST_ID_NAME)
819 m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
821 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
822 m->destination = m->destination_buffer;
825 /* We take possession of the kmsg struct now */
827 m->release_kdbus = true;
831 bus->rqueue[bus->rqueue_size++] = m;
837 sd_bus_message_unref(m);
842 int bus_kernel_take_fd(sd_bus *b) {
843 struct kdbus_bloom_parameter *bloom = NULL;
844 struct kdbus_cmd_hello *hello;
845 struct kdbus_item_list *items;
846 struct kdbus_item *item;
847 _cleanup_free_ char *g = NULL;
849 size_t l = 0, m = 0, sz;
859 if (b->description) {
860 g = bus_label_escape(b->description);
868 /* If no name is explicitly set, we'll include a hint
869 * indicating the library implementation, a hint which
870 * kind of bus this is and the thread name */
872 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
875 name = b->is_system ? "sd-system" :
876 b->is_user ? "sd-user" : "sd";
878 _cleanup_free_ char *e = NULL;
880 e = bus_label_escape(pr);
884 g = strappend(b->is_system ? "sd-system-" :
885 b->is_user ? "sd-user-" : "sd-",
893 b->description = bus_label_unescape(name);
900 sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
901 ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
903 if (b->fake_creds_valid)
904 sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
906 if (b->fake_pids_valid)
907 sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
910 l = strlen(b->fake_label);
911 sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
914 hello = alloca0_align(sz, 8);
916 hello->flags = b->hello_flags;
917 hello->attach_flags_send = _KDBUS_ATTACH_ANY;
918 hello->attach_flags_recv = b->attach_flags;
919 hello->pool_size = KDBUS_POOL_SIZE;
923 item->size = offsetof(struct kdbus_item, str) + m + 1;
924 item->type = KDBUS_ITEM_CONN_DESCRIPTION;
925 memcpy(item->str, name, m + 1);
926 item = KDBUS_ITEM_NEXT(item);
928 if (b->fake_creds_valid) {
929 item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
930 item->type = KDBUS_ITEM_CREDS;
931 item->creds = b->fake_creds;
933 item = KDBUS_ITEM_NEXT(item);
936 if (b->fake_pids_valid) {
937 item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
938 item->type = KDBUS_ITEM_PIDS;
939 item->pids = b->fake_pids;
941 item = KDBUS_ITEM_NEXT(item);
945 item->size = offsetof(struct kdbus_item, str) + l + 1;
946 item->type = KDBUS_ITEM_SECLABEL;
947 memcpy(item->str, b->fake_label, l+1);
950 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
954 if (!b->kdbus_buffer) {
955 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
956 if (b->kdbus_buffer == MAP_FAILED) {
957 b->kdbus_buffer = NULL;
963 /* The higher 32bit of the bus_flags fields are considered
964 * 'incompatible flags'. Refuse them all for now. */
965 if (hello->bus_flags > 0xFFFFFFFFULL) {
970 /* extract bloom parameters from items */
971 items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
972 KDBUS_ITEM_FOREACH(item, items, items) {
973 switch (item->type) {
974 case KDBUS_ITEM_BLOOM_PARAMETER:
975 bloom = &item->bloom_parameter;
980 if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
985 b->bloom_size = (size_t) bloom->size;
986 b->bloom_n_hash = (unsigned) bloom->n_hash;
988 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
993 b->unique_id = hello->id;
996 b->bus_client = true;
997 b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
998 b->message_version = 2;
999 b->message_endian = BUS_NATIVE_ENDIAN;
1001 /* the kernel told us the UUID of the underlying bus */
1002 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
1004 /* free returned items */
1005 (void) bus_kernel_cmd_free(b, hello->offset);
1006 return bus_start_running(b);
1009 (void) bus_kernel_cmd_free(b, hello->offset);
1013 int bus_kernel_connect(sd_bus *b) {
1015 assert(b->input_fd < 0);
1016 assert(b->output_fd < 0);
1022 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
1023 if (b->input_fd < 0)
1026 b->output_fd = b->input_fd;
1028 return bus_kernel_take_fd(b);
1031 int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
1032 struct kdbus_cmd_free cmd = {
1033 .size = sizeof(cmd),
1039 assert(bus->is_kernel);
1041 r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
1048 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
1049 struct kdbus_item *d;
1054 KDBUS_ITEM_FOREACH(d, k, items) {
1055 if (d->type == KDBUS_ITEM_FDS)
1056 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
1057 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
1058 safe_close(d->memfd.fd);
1061 bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
1064 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
1065 struct kdbus_cmd_send cmd = { };
1070 assert(bus->state == BUS_RUNNING);
1072 /* If we can't deliver, we want room for the error message */
1073 r = bus_rqueue_make_room(bus);
1077 r = bus_message_setup_kmsg(bus, m);
1081 cmd.size = sizeof(cmd);
1082 cmd.msg_address = (uintptr_t)m->kdbus;
1084 /* If this is a synchronous method call, then let's tell the
1085 * kernel, so that it can pass CPU time/scheduling to the
1086 * destination for the time, if it wants to. If we
1087 * synchronously wait for the result anyway, we won't need CPU
1089 if (hint_sync_call) {
1090 m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
1091 cmd.flags |= KDBUS_SEND_SYNC_REPLY;
1094 r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
1096 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1097 sd_bus_message *reply;
1099 if (errno == EAGAIN || errno == EINTR)
1101 else if (errno == ENXIO || errno == ESRCH) {
1103 /* ENXIO: unique name not known
1104 * ESRCH: well-known name not known */
1106 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1107 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
1109 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
1113 } else if (errno == EADDRNOTAVAIL) {
1115 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
1117 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1118 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
1120 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
1126 r = bus_message_new_synthetic_error(
1128 BUS_MESSAGE_COOKIE(m),
1135 r = bus_seal_synthetic_message(bus, reply);
1139 bus->rqueue[bus->rqueue_size++] = reply;
1141 } else if (hint_sync_call) {
1142 struct kdbus_msg *k;
1144 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
1147 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1149 r = bus_kernel_make_message(bus, k);
1151 close_kdbus_msg(bus, k);
1153 /* Anybody can send us invalid messages, let's just drop them. */
1154 if (r == -EBADMSG || r == -EPROTOTYPE)
1155 log_debug_errno(r, "Ignoring invalid synchronous reply: %m");
1160 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1161 close_kdbus_msg(bus, k);
1168 static int push_name_owner_changed(
1171 const char *old_owner,
1172 const char *new_owner,
1173 const struct kdbus_timestamp *ts) {
1175 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1180 r = sd_bus_message_new_signal(
1183 "/org/freedesktop/DBus",
1184 "org.freedesktop.DBus",
1185 "NameOwnerChanged");
1189 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
1193 bus_message_set_sender_driver(bus, m);
1194 message_set_timestamp(bus, m, ts);
1196 r = bus_seal_synthetic_message(bus, m);
1200 bus->rqueue[bus->rqueue_size++] = m;
1206 static int translate_name_change(
1208 const struct kdbus_msg *k,
1209 const struct kdbus_item *d,
1210 const struct kdbus_timestamp *ts) {
1212 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
1218 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
1221 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
1223 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
1225 if (isempty(old_owner))
1230 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
1232 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts);
1235 static int translate_id_change(
1237 const struct kdbus_msg *k,
1238 const struct kdbus_item *d,
1239 const struct kdbus_timestamp *ts) {
1241 char owner[UNIQUE_NAME_MAX];
1247 sprintf(owner, ":1.%llu", d->id_change.id);
1249 return push_name_owner_changed(
1251 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
1252 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL,
1256 static int translate_reply(
1258 const struct kdbus_msg *k,
1259 const struct kdbus_item *d,
1260 const struct kdbus_timestamp *ts) {
1262 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1269 r = bus_message_new_synthetic_error(
1272 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1273 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1274 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1279 message_set_timestamp(bus, m, ts);
1281 r = bus_seal_synthetic_message(bus, m);
1285 bus->rqueue[bus->rqueue_size++] = m;
1291 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1292 static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = {
1293 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1294 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1295 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1297 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1298 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1300 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1301 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1304 struct kdbus_item *d, *found = NULL;
1305 struct kdbus_timestamp *ts = NULL;
1309 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1311 KDBUS_ITEM_FOREACH(d, k, items) {
1312 if (d->type == KDBUS_ITEM_TIMESTAMP)
1315 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1320 log_debug("Got unknown field from kernel %llu", d->type);
1324 log_debug("Didn't find a kernel message to translate.");
1328 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts);
1331 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1332 struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
1333 struct kdbus_msg *k;
1338 r = bus_rqueue_make_room(bus);
1342 if (hint_priority) {
1343 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1344 recv.priority = priority;
1347 r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
1348 if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
1349 log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
1351 if (errno == EAGAIN)
1357 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset);
1358 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1359 r = bus_kernel_make_message(bus, k);
1361 /* Anybody can send us invalid messages, let's just drop them. */
1362 if (r == -EBADMSG || r == -EPROTOTYPE) {
1363 log_debug_errno(r, "Ignoring invalid message: %m");
1367 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
1368 r = bus_kernel_translate_message(bus, k);
1370 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1375 close_kdbus_msg(bus, k);
1377 return r < 0 ? r : 1;
1380 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1381 struct memfd_cache *c;
1388 if (!bus || !bus->is_kernel)
1391 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1393 if (bus->n_memfd_cache <= 0) {
1396 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1398 r = memfd_new(bus->description);
1408 c = &bus->memfd_cache[--bus->n_memfd_cache];
1411 assert(c->mapped == 0 || c->address);
1413 *address = c->address;
1414 *mapped = c->mapped;
1415 *allocated = c->allocated;
1418 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1423 static void close_and_munmap(int fd, void *address, size_t size) {
1425 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1430 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1431 struct memfd_cache *c;
1432 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1435 assert(mapped == 0 || address);
1437 if (!bus || !bus->is_kernel) {
1438 close_and_munmap(fd, address, mapped);
1442 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1444 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1445 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1447 close_and_munmap(fd, address, mapped);
1451 c = &bus->memfd_cache[bus->n_memfd_cache++];
1453 c->address = address;
1455 /* If overly long, let's return a bit to the OS */
1456 if (mapped > max_mapped) {
1457 assert_se(memfd_set_size(fd, max_mapped) >= 0);
1458 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1459 c->mapped = c->allocated = max_mapped;
1462 c->allocated = allocated;
1465 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1468 void bus_kernel_flush_memfd(sd_bus *b) {
1473 for (i = 0; i < b->n_memfd_cache; i++)
1474 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1477 uint64_t request_name_flags_to_kdbus(uint64_t flags) {
1480 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1481 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1483 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1484 f |= KDBUS_NAME_REPLACE_EXISTING;
1486 if (flags & SD_BUS_NAME_QUEUE)
1487 f |= KDBUS_NAME_QUEUE;
1492 uint64_t attach_flags_to_kdbus(uint64_t mask) {
1495 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
1496 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
1497 m |= KDBUS_ATTACH_CREDS;
1499 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID))
1500 m |= KDBUS_ATTACH_PIDS;
1502 if (mask & SD_BUS_CREDS_COMM)
1503 m |= KDBUS_ATTACH_PID_COMM;
1505 if (mask & SD_BUS_CREDS_TID_COMM)
1506 m |= KDBUS_ATTACH_TID_COMM;
1508 if (mask & SD_BUS_CREDS_EXE)
1509 m |= KDBUS_ATTACH_EXE;
1511 if (mask & SD_BUS_CREDS_CMDLINE)
1512 m |= KDBUS_ATTACH_CMDLINE;
1514 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))
1515 m |= KDBUS_ATTACH_CGROUP;
1517 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1518 m |= KDBUS_ATTACH_CAPS;
1520 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1521 m |= KDBUS_ATTACH_SECLABEL;
1523 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1524 m |= KDBUS_ATTACH_AUDIT;
1526 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1527 m |= KDBUS_ATTACH_NAMES;
1529 if (mask & SD_BUS_CREDS_DESCRIPTION)
1530 m |= KDBUS_ATTACH_CONN_DESCRIPTION;
1532 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
1533 m |= KDBUS_ATTACH_AUXGROUPS;
1538 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1539 struct kdbus_cmd *make;
1540 struct kdbus_item *n;
1547 fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1552 make = alloca0_align(offsetof(struct kdbus_cmd, items) +
1553 ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
1554 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1555 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1556 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
1559 make->size = offsetof(struct kdbus_cmd, items);
1561 /* Set the bloom parameters */
1563 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1564 sizeof(struct kdbus_bloom_parameter);
1565 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1566 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1567 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1569 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1570 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1572 make->size += ALIGN8(n->size);
1574 /* The busses we create make no restrictions on what metadata
1575 * peers can read from incoming messages. */
1576 n = KDBUS_ITEM_NEXT(n);
1577 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1578 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1579 n->data64[0] = _KDBUS_ATTACH_ANY;
1580 make->size += ALIGN8(n->size);
1582 /* Provide all metadata via bus-owner queries */
1583 n = KDBUS_ITEM_NEXT(n);
1584 n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
1585 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1586 n->data64[0] = _KDBUS_ATTACH_ANY;
1587 make->size += ALIGN8(n->size);
1589 /* Set the a good name */
1590 n = KDBUS_ITEM_NEXT(n);
1591 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1592 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1593 n->type = KDBUS_ITEM_MAKE_NAME;
1594 make->size += ALIGN8(n->size);
1596 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1598 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1606 p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
1618 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1625 len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1632 p = newa(char, len);
1634 sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1636 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1650 int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
1651 _cleanup_free_ char *path = NULL;
1652 struct kdbus_cmd *make;
1653 struct kdbus_item *n;
1657 fd = bus_kernel_open_bus_fd(bus_name, &path);
1661 make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) +
1662 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1),
1664 make->size = ALIGN8(offsetof(struct kdbus_cmd, items));
1665 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1668 sprintf(n->str, UID_FMT "-%s", getuid(), ep_name);
1669 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1670 n->type = KDBUS_ITEM_MAKE_NAME;
1671 make->size += ALIGN8(n->size);
1674 if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
1682 p = strjoin(dirname(path), "/", name, NULL);
1694 int bus_kernel_try_close(sd_bus *bus) {
1695 struct kdbus_cmd byebye = { .size = sizeof(byebye) };
1698 assert(bus->is_kernel);
1700 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0)
1706 int bus_kernel_drop_one(int fd) {
1707 struct kdbus_cmd_recv recv = {
1708 .size = sizeof(recv),
1709 .flags = KDBUS_RECV_DROP,
1714 if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
1720 int bus_kernel_realize_attach_flags(sd_bus *bus) {
1721 struct kdbus_cmd *update;
1722 struct kdbus_item *n;
1725 assert(bus->is_kernel);
1727 update = alloca0_align(offsetof(struct kdbus_cmd, items) +
1728 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
1732 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1733 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1734 n->data64[0] = bus->attach_flags;
1737 offsetof(struct kdbus_cmd, items) +
1740 if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0)
1746 int bus_kernel_fix_attach_mask(void) {
1747 _cleanup_free_ char *mask = NULL;
1748 uint64_t m = (uint64_t) -1;
1752 /* By default we don't want any kdbus metadata fields to be
1753 * suppressed, hence we reset the kernel mask for it to
1754 * (uint64_t) -1. If the module argument was overwritten by
1755 * the kernel cmdline, we leave it as is. */
1757 r = get_proc_cmdline_key("kdbus.attach_flags_mask=", &mask);
1759 return log_warning_errno(r, "Failed to read kernel command line: %m");
1762 sprintf(buf, "0x%" PRIx64 "\n", m);
1763 r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
1765 return log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
1766 "Failed to write kdbus attach mask: %m");
1772 int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
1773 struct kdbus_cmd_info cmd = {
1774 .size = sizeof(struct kdbus_cmd_info),
1776 struct kdbus_info *info;
1777 struct kdbus_item *item;
1783 assert(bus->is_kernel);
1785 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
1789 info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
1791 KDBUS_ITEM_FOREACH(item, info, items)
1792 if (item->type == KDBUS_ITEM_MAKE_NAME) {
1793 r = free_and_strdup(&n, item->str);
1797 bus_kernel_cmd_free(bus, cmd.offset);