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;
598 if (d->pids.ppid > 0) {
599 m->creds.ppid = (pid_t) d->pids.ppid;
600 m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
601 } else if (d->pids.pid == 1) {
603 m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
608 case KDBUS_ITEM_CREDS:
610 /* EUID/SUID/FSUID/EGID/SGID/FSGID might be
611 * missing too (see above). */
613 if ((uid_t) d->creds.uid != UID_INVALID) {
614 m->creds.uid = (uid_t) d->creds.uid;
615 m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask;
618 if ((uid_t) d->creds.euid != UID_INVALID) {
619 m->creds.euid = (uid_t) d->creds.euid;
620 m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask;
623 if ((uid_t) d->creds.suid != UID_INVALID) {
624 m->creds.suid = (uid_t) d->creds.suid;
625 m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask;
628 if ((uid_t) d->creds.fsuid != UID_INVALID) {
629 m->creds.fsuid = (uid_t) d->creds.fsuid;
630 m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask;
633 if ((gid_t) d->creds.gid != GID_INVALID) {
634 m->creds.gid = (gid_t) d->creds.gid;
635 m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask;
638 if ((gid_t) d->creds.egid != GID_INVALID) {
639 m->creds.egid = (gid_t) d->creds.egid;
640 m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask;
643 if ((gid_t) d->creds.sgid != GID_INVALID) {
644 m->creds.sgid = (gid_t) d->creds.sgid;
645 m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask;
648 if ((gid_t) d->creds.fsgid != GID_INVALID) {
649 m->creds.fsgid = (gid_t) d->creds.fsgid;
650 m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask;
655 case KDBUS_ITEM_TIMESTAMP:
656 message_set_timestamp(bus, m, &d->timestamp);
659 case KDBUS_ITEM_PID_COMM:
660 m->creds.comm = d->str;
661 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
664 case KDBUS_ITEM_TID_COMM:
665 m->creds.tid_comm = d->str;
666 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
670 m->creds.exe = d->str;
671 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
674 case KDBUS_ITEM_CMDLINE:
675 m->creds.cmdline = d->str;
676 m->creds.cmdline_size = l;
677 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
680 case KDBUS_ITEM_CGROUP:
681 m->creds.cgroup = d->str;
682 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;
684 r = bus_get_root_path(bus);
688 m->creds.cgroup_root = bus->cgroup_root;
691 case KDBUS_ITEM_AUDIT:
692 m->creds.audit_session_id = (uint32_t) d->audit.sessionid;
693 m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask;
695 m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
696 m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask;
699 case KDBUS_ITEM_CAPS:
700 if (d->caps.last_cap != cap_last_cap() ||
701 d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) {
706 m->creds.capability = d->caps.caps;
707 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;
710 case KDBUS_ITEM_DST_NAME:
711 if (!service_name_is_valid(d->str)) {
716 destination = d->str;
719 case KDBUS_ITEM_OWNED_NAME:
720 if (!service_name_is_valid(d->name.name)) {
725 if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
729 /* We just extend the array here, but
730 * do not allocate the strings inside
731 * of it, instead we just point to our
732 * buffer directly. */
733 n = strv_length(m->creds.well_known_names);
734 wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*));
740 wkn[n] = d->name.name;
742 m->creds.well_known_names = wkn;
744 m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
748 case KDBUS_ITEM_CONN_DESCRIPTION:
749 m->creds.description = d->str;
750 m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask;
753 case KDBUS_ITEM_AUXGROUPS:
755 if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
759 n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t);
766 for (i = 0; i < n; i++)
769 m->creds.supplementary_gids = g;
770 m->creds.n_supplementary_gids = n;
771 m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
777 case KDBUS_ITEM_SECLABEL:
781 log_debug("Got unknown field from kernel %llu", d->type);
785 /* If we requested the list of well-known names to be appended
786 * and the sender had none no item for it will be
787 * attached. However, this does *not* mean that the kernel
788 * didn't want to provide this information to us. Hence, let's
789 * explicitly mark this information as available if it was
791 m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
793 r = bus_message_parse_fields(m);
797 /* Refuse messages if kdbus and dbus1 cookie doesn't match up */
798 if ((uint64_t) m->header->dbus2.cookie != k->cookie) {
803 /* Refuse messages where the reply flag doesn't match up */
804 if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
809 /* Refuse reply messages where the reply cookie doesn't match up */
810 if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) {
815 /* Refuse messages where the autostart flag doesn't match up */
816 if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
821 /* Override information from the user header with data from the kernel */
822 if (k->src_id == KDBUS_SRC_ID_KERNEL)
823 bus_message_set_sender_driver(bus, m);
825 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
826 m->sender = m->creds.unique_name = m->sender_buffer;
830 m->destination = destination;
831 else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
832 m->destination = NULL;
833 else if (k->dst_id == KDBUS_DST_ID_NAME)
834 m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
836 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
837 m->destination = m->destination_buffer;
840 /* We take possession of the kmsg struct now */
842 m->release_kdbus = true;
846 bus->rqueue[bus->rqueue_size++] = m;
852 sd_bus_message_unref(m);
857 int bus_kernel_take_fd(sd_bus *b) {
858 struct kdbus_bloom_parameter *bloom = NULL;
859 struct kdbus_item *items, *item;
860 struct kdbus_cmd_hello *hello;
861 _cleanup_free_ char *g = NULL;
863 size_t l = 0, m = 0, sz;
873 if (b->description) {
874 g = bus_label_escape(b->description);
882 /* If no name is explicitly set, we'll include a hint
883 * indicating the library implementation, a hint which
884 * kind of bus this is and the thread name */
886 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
889 name = b->is_system ? "sd-system" :
890 b->is_user ? "sd-user" : "sd";
892 _cleanup_free_ char *e = NULL;
894 e = bus_label_escape(pr);
898 g = strappend(b->is_system ? "sd-system-" :
899 b->is_user ? "sd-user-" : "sd-",
907 b->description = bus_label_unescape(name);
914 sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
915 ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
917 if (b->fake_creds_valid)
918 sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
920 if (b->fake_pids_valid)
921 sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
924 l = strlen(b->fake_label);
925 sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
928 hello = alloca0_align(sz, 8);
930 hello->flags = b->hello_flags;
931 hello->attach_flags_send = _KDBUS_ATTACH_ANY;
932 hello->attach_flags_recv = b->attach_flags;
933 hello->pool_size = KDBUS_POOL_SIZE;
937 item->size = offsetof(struct kdbus_item, str) + m + 1;
938 item->type = KDBUS_ITEM_CONN_DESCRIPTION;
939 memcpy(item->str, name, m + 1);
940 item = KDBUS_ITEM_NEXT(item);
942 if (b->fake_creds_valid) {
943 item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
944 item->type = KDBUS_ITEM_CREDS;
945 item->creds = b->fake_creds;
947 item = KDBUS_ITEM_NEXT(item);
950 if (b->fake_pids_valid) {
951 item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
952 item->type = KDBUS_ITEM_PIDS;
953 item->pids = b->fake_pids;
955 item = KDBUS_ITEM_NEXT(item);
959 item->size = offsetof(struct kdbus_item, str) + l + 1;
960 item->type = KDBUS_ITEM_SECLABEL;
961 memcpy(item->str, b->fake_label, l+1);
964 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
968 if (!b->kdbus_buffer) {
969 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
970 if (b->kdbus_buffer == MAP_FAILED) {
971 b->kdbus_buffer = NULL;
977 /* The higher 32bit of the bus_flags fields are considered
978 * 'incompatible flags'. Refuse them all for now. */
979 if (hello->bus_flags > 0xFFFFFFFFULL) {
984 /* extract bloom parameters from items */
985 items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
986 KDBUS_FOREACH(item, items, hello->items_size) {
987 switch (item->type) {
988 case KDBUS_ITEM_BLOOM_PARAMETER:
989 bloom = &item->bloom_parameter;
994 if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
999 b->bloom_size = (size_t) bloom->size;
1000 b->bloom_n_hash = (unsigned) bloom->n_hash;
1002 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
1007 b->unique_id = hello->id;
1009 b->is_kernel = true;
1010 b->bus_client = true;
1011 b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
1012 b->message_version = 2;
1013 b->message_endian = BUS_NATIVE_ENDIAN;
1015 /* the kernel told us the UUID of the underlying bus */
1016 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
1018 /* free returned items */
1019 (void) bus_kernel_cmd_free(b, hello->offset);
1020 return bus_start_running(b);
1023 (void) bus_kernel_cmd_free(b, hello->offset);
1027 int bus_kernel_connect(sd_bus *b) {
1029 assert(b->input_fd < 0);
1030 assert(b->output_fd < 0);
1036 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
1037 if (b->input_fd < 0)
1040 b->output_fd = b->input_fd;
1042 return bus_kernel_take_fd(b);
1045 int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
1046 struct kdbus_cmd_free cmd = {
1047 .size = sizeof(cmd),
1053 assert(bus->is_kernel);
1055 r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
1062 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
1063 struct kdbus_item *d;
1068 KDBUS_ITEM_FOREACH(d, k, items) {
1069 if (d->type == KDBUS_ITEM_FDS)
1070 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
1071 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
1072 safe_close(d->memfd.fd);
1075 bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
1078 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
1079 struct kdbus_cmd_send cmd = { };
1084 assert(bus->state == BUS_RUNNING);
1086 /* If we can't deliver, we want room for the error message */
1087 r = bus_rqueue_make_room(bus);
1091 r = bus_message_setup_kmsg(bus, m);
1095 cmd.size = sizeof(cmd);
1096 cmd.msg_address = (uintptr_t)m->kdbus;
1098 /* If this is a synchronous method call, then let's tell the
1099 * kernel, so that it can pass CPU time/scheduling to the
1100 * destination for the time, if it wants to. If we
1101 * synchronously wait for the result anyway, we won't need CPU
1103 if (hint_sync_call) {
1104 m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
1105 cmd.flags |= KDBUS_SEND_SYNC_REPLY;
1108 r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
1110 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1111 sd_bus_message *reply;
1113 if (errno == EAGAIN || errno == EINTR)
1115 else if (errno == ENXIO || errno == ESRCH) {
1117 /* ENXIO: unique name not known
1118 * ESRCH: well-known name not known */
1120 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1121 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
1123 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
1127 } else if (errno == EADDRNOTAVAIL) {
1129 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
1131 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1132 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
1134 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
1140 r = bus_message_new_synthetic_error(
1142 BUS_MESSAGE_COOKIE(m),
1149 r = bus_seal_synthetic_message(bus, reply);
1153 bus->rqueue[bus->rqueue_size++] = reply;
1155 } else if (hint_sync_call) {
1156 struct kdbus_msg *k;
1158 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
1161 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1163 r = bus_kernel_make_message(bus, k);
1165 close_kdbus_msg(bus, k);
1167 /* Anybody can send us invalid messages, let's just drop them. */
1168 if (r == -EBADMSG || r == -EPROTOTYPE)
1169 log_debug_errno(r, "Ignoring invalid synchronous reply: %m");
1174 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1175 close_kdbus_msg(bus, k);
1182 static int push_name_owner_changed(
1185 const char *old_owner,
1186 const char *new_owner,
1187 const struct kdbus_timestamp *ts) {
1189 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1194 r = sd_bus_message_new_signal(
1197 "/org/freedesktop/DBus",
1198 "org.freedesktop.DBus",
1199 "NameOwnerChanged");
1203 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
1207 bus_message_set_sender_driver(bus, m);
1208 message_set_timestamp(bus, m, ts);
1210 r = bus_seal_synthetic_message(bus, m);
1214 bus->rqueue[bus->rqueue_size++] = m;
1220 static int translate_name_change(
1222 const struct kdbus_msg *k,
1223 const struct kdbus_item *d,
1224 const struct kdbus_timestamp *ts) {
1226 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
1232 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
1235 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
1237 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
1239 if (isempty(old_owner))
1244 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
1246 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts);
1249 static int translate_id_change(
1251 const struct kdbus_msg *k,
1252 const struct kdbus_item *d,
1253 const struct kdbus_timestamp *ts) {
1255 char owner[UNIQUE_NAME_MAX];
1261 sprintf(owner, ":1.%llu", d->id_change.id);
1263 return push_name_owner_changed(
1265 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
1266 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL,
1270 static int translate_reply(
1272 const struct kdbus_msg *k,
1273 const struct kdbus_item *d,
1274 const struct kdbus_timestamp *ts) {
1276 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1283 r = bus_message_new_synthetic_error(
1286 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1287 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1288 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1293 message_set_timestamp(bus, m, ts);
1295 r = bus_seal_synthetic_message(bus, m);
1299 bus->rqueue[bus->rqueue_size++] = m;
1305 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1306 static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = {
1307 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1308 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1309 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1311 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1312 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1314 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1315 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1318 struct kdbus_item *d, *found = NULL;
1319 struct kdbus_timestamp *ts = NULL;
1323 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1325 KDBUS_ITEM_FOREACH(d, k, items) {
1326 if (d->type == KDBUS_ITEM_TIMESTAMP)
1329 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1334 log_debug("Got unknown field from kernel %llu", d->type);
1338 log_debug("Didn't find a kernel message to translate.");
1342 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts);
1345 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1346 struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
1347 struct kdbus_msg *k;
1352 r = bus_rqueue_make_room(bus);
1356 if (hint_priority) {
1357 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1358 recv.priority = priority;
1361 r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
1362 if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
1363 log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
1365 if (errno == EAGAIN)
1371 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset);
1372 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1373 r = bus_kernel_make_message(bus, k);
1375 /* Anybody can send us invalid messages, let's just drop them. */
1376 if (r == -EBADMSG || r == -EPROTOTYPE) {
1377 log_debug_errno(r, "Ignoring invalid message: %m");
1381 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
1382 r = bus_kernel_translate_message(bus, k);
1384 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1389 close_kdbus_msg(bus, k);
1391 return r < 0 ? r : 1;
1394 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1395 struct memfd_cache *c;
1402 if (!bus || !bus->is_kernel)
1405 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1407 if (bus->n_memfd_cache <= 0) {
1410 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1412 r = memfd_new(bus->description);
1422 c = &bus->memfd_cache[--bus->n_memfd_cache];
1425 assert(c->mapped == 0 || c->address);
1427 *address = c->address;
1428 *mapped = c->mapped;
1429 *allocated = c->allocated;
1432 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1437 static void close_and_munmap(int fd, void *address, size_t size) {
1439 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1444 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1445 struct memfd_cache *c;
1446 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1449 assert(mapped == 0 || address);
1451 if (!bus || !bus->is_kernel) {
1452 close_and_munmap(fd, address, mapped);
1456 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1458 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1459 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1461 close_and_munmap(fd, address, mapped);
1465 c = &bus->memfd_cache[bus->n_memfd_cache++];
1467 c->address = address;
1469 /* If overly long, let's return a bit to the OS */
1470 if (mapped > max_mapped) {
1471 assert_se(memfd_set_size(fd, max_mapped) >= 0);
1472 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1473 c->mapped = c->allocated = max_mapped;
1476 c->allocated = allocated;
1479 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1482 void bus_kernel_flush_memfd(sd_bus *b) {
1487 for (i = 0; i < b->n_memfd_cache; i++)
1488 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1491 uint64_t request_name_flags_to_kdbus(uint64_t flags) {
1494 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1495 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1497 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1498 f |= KDBUS_NAME_REPLACE_EXISTING;
1500 if (flags & SD_BUS_NAME_QUEUE)
1501 f |= KDBUS_NAME_QUEUE;
1506 uint64_t attach_flags_to_kdbus(uint64_t mask) {
1509 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
1510 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
1511 m |= KDBUS_ATTACH_CREDS;
1513 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID))
1514 m |= KDBUS_ATTACH_PIDS;
1516 if (mask & SD_BUS_CREDS_COMM)
1517 m |= KDBUS_ATTACH_PID_COMM;
1519 if (mask & SD_BUS_CREDS_TID_COMM)
1520 m |= KDBUS_ATTACH_TID_COMM;
1522 if (mask & SD_BUS_CREDS_EXE)
1523 m |= KDBUS_ATTACH_EXE;
1525 if (mask & SD_BUS_CREDS_CMDLINE)
1526 m |= KDBUS_ATTACH_CMDLINE;
1528 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))
1529 m |= KDBUS_ATTACH_CGROUP;
1531 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1532 m |= KDBUS_ATTACH_CAPS;
1534 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1535 m |= KDBUS_ATTACH_SECLABEL;
1537 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1538 m |= KDBUS_ATTACH_AUDIT;
1540 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1541 m |= KDBUS_ATTACH_NAMES;
1543 if (mask & SD_BUS_CREDS_DESCRIPTION)
1544 m |= KDBUS_ATTACH_CONN_DESCRIPTION;
1546 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
1547 m |= KDBUS_ATTACH_AUXGROUPS;
1552 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1553 struct kdbus_cmd *make;
1554 struct kdbus_item *n;
1561 fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1566 make = alloca0_align(offsetof(struct kdbus_cmd, items) +
1567 ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
1568 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1569 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1570 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
1573 make->size = offsetof(struct kdbus_cmd, items);
1575 /* Set the bloom parameters */
1577 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1578 sizeof(struct kdbus_bloom_parameter);
1579 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1580 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1581 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1583 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1584 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1586 make->size += ALIGN8(n->size);
1588 /* The busses we create make no restrictions on what metadata
1589 * peers can read from incoming messages. */
1590 n = KDBUS_ITEM_NEXT(n);
1591 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1592 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1593 n->data64[0] = _KDBUS_ATTACH_ANY;
1594 make->size += ALIGN8(n->size);
1596 /* Provide all metadata via bus-owner queries */
1597 n = KDBUS_ITEM_NEXT(n);
1598 n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
1599 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1600 n->data64[0] = _KDBUS_ATTACH_ANY;
1601 make->size += ALIGN8(n->size);
1603 /* Set the a good name */
1604 n = KDBUS_ITEM_NEXT(n);
1605 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1606 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1607 n->type = KDBUS_ITEM_MAKE_NAME;
1608 make->size += ALIGN8(n->size);
1610 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1612 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1620 p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
1632 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1639 len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1646 p = newa(char, len);
1648 sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1650 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1664 int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
1665 _cleanup_free_ char *path = NULL;
1666 struct kdbus_cmd *make;
1667 struct kdbus_item *n;
1671 fd = bus_kernel_open_bus_fd(bus_name, &path);
1675 make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) +
1676 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1),
1678 make->size = ALIGN8(offsetof(struct kdbus_cmd, items));
1679 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1682 sprintf(n->str, UID_FMT "-%s", getuid(), ep_name);
1683 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1684 n->type = KDBUS_ITEM_MAKE_NAME;
1685 make->size += ALIGN8(n->size);
1688 if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
1696 p = strjoin(dirname(path), "/", name, NULL);
1708 int bus_kernel_try_close(sd_bus *bus) {
1709 struct kdbus_cmd byebye = { .size = sizeof(byebye) };
1712 assert(bus->is_kernel);
1714 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0)
1720 int bus_kernel_drop_one(int fd) {
1721 struct kdbus_cmd_recv recv = {
1722 .size = sizeof(recv),
1723 .flags = KDBUS_RECV_DROP,
1728 if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
1734 int bus_kernel_realize_attach_flags(sd_bus *bus) {
1735 struct kdbus_cmd *update;
1736 struct kdbus_item *n;
1739 assert(bus->is_kernel);
1741 update = alloca0_align(offsetof(struct kdbus_cmd, items) +
1742 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
1746 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1747 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1748 n->data64[0] = bus->attach_flags;
1751 offsetof(struct kdbus_cmd, items) +
1754 if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0)
1760 int bus_kernel_fix_attach_mask(void) {
1761 _cleanup_free_ char *mask = NULL;
1762 uint64_t m = (uint64_t) -1;
1766 /* By default we don't want any kdbus metadata fields to be
1767 * suppressed, hence we reset the kernel mask for it to
1768 * (uint64_t) -1. If the module argument was overwritten by
1769 * the kernel cmdline, we leave it as is. */
1771 r = get_proc_cmdline_key("kdbus.attach_flags_mask=", &mask);
1773 return log_warning_errno(r, "Failed to read kernel command line: %m");
1776 sprintf(buf, "0x%" PRIx64 "\n", m);
1777 r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
1779 return log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
1780 "Failed to write kdbus attach mask: %m");
1786 int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
1787 struct kdbus_cmd_info cmd = {
1788 .size = sizeof(struct kdbus_cmd_info),
1790 struct kdbus_info *info;
1791 struct kdbus_item *item;
1797 assert(bus->is_kernel);
1799 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
1803 info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
1805 KDBUS_ITEM_FOREACH(item, info, items)
1806 if (item->type == KDBUS_ITEM_MAKE_NAME) {
1807 r = free_and_strdup(&n, item->str);
1811 bus_kernel_cmd_free(bus, cmd.offset);