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);
967 /* If the ioctl is not supported we assume that the
968 * API version changed in a major incompatible way,
969 * let's indicate an API incompatibility in this
971 return -ESOCKTNOSUPPORT;
976 if (!b->kdbus_buffer) {
977 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
978 if (b->kdbus_buffer == MAP_FAILED) {
979 b->kdbus_buffer = NULL;
985 /* The higher 32bit of the bus_flags fields are considered
986 * 'incompatible flags'. Refuse them all for now. */
987 if (hello->bus_flags > 0xFFFFFFFFULL) {
988 r = -ESOCKTNOSUPPORT;
992 /* extract bloom parameters from items */
993 items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
994 KDBUS_FOREACH(item, items, hello->items_size) {
995 switch (item->type) {
996 case KDBUS_ITEM_BLOOM_PARAMETER:
997 bloom = &item->bloom_parameter;
1002 if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
1007 b->bloom_size = (size_t) bloom->size;
1008 b->bloom_n_hash = (unsigned) bloom->n_hash;
1010 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
1015 b->unique_id = hello->id;
1017 b->is_kernel = true;
1018 b->bus_client = true;
1019 b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
1020 b->message_version = 2;
1021 b->message_endian = BUS_NATIVE_ENDIAN;
1023 /* the kernel told us the UUID of the underlying bus */
1024 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
1026 /* free returned items */
1027 (void) bus_kernel_cmd_free(b, hello->offset);
1028 return bus_start_running(b);
1031 (void) bus_kernel_cmd_free(b, hello->offset);
1035 int bus_kernel_connect(sd_bus *b) {
1037 assert(b->input_fd < 0);
1038 assert(b->output_fd < 0);
1044 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
1045 if (b->input_fd < 0)
1048 b->output_fd = b->input_fd;
1050 return bus_kernel_take_fd(b);
1053 int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
1054 struct kdbus_cmd_free cmd = {
1055 .size = sizeof(cmd),
1061 assert(bus->is_kernel);
1063 r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
1070 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
1071 struct kdbus_item *d;
1076 KDBUS_ITEM_FOREACH(d, k, items) {
1077 if (d->type == KDBUS_ITEM_FDS)
1078 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
1079 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
1080 safe_close(d->memfd.fd);
1083 bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
1086 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
1087 struct kdbus_cmd_send cmd = { };
1092 assert(bus->state == BUS_RUNNING);
1094 /* If we can't deliver, we want room for the error message */
1095 r = bus_rqueue_make_room(bus);
1099 r = bus_message_setup_kmsg(bus, m);
1103 cmd.size = sizeof(cmd);
1104 cmd.msg_address = (uintptr_t)m->kdbus;
1106 /* If this is a synchronous method call, then let's tell the
1107 * kernel, so that it can pass CPU time/scheduling to the
1108 * destination for the time, if it wants to. If we
1109 * synchronously wait for the result anyway, we won't need CPU
1111 if (hint_sync_call) {
1112 m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
1113 cmd.flags |= KDBUS_SEND_SYNC_REPLY;
1116 r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
1118 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1119 sd_bus_message *reply;
1121 if (errno == EAGAIN || errno == EINTR)
1123 else if (errno == ENXIO || errno == ESRCH) {
1125 /* ENXIO: unique name not known
1126 * ESRCH: well-known name not known */
1128 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1129 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
1131 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
1135 } else if (errno == EADDRNOTAVAIL) {
1137 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
1139 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1140 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
1142 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
1148 r = bus_message_new_synthetic_error(
1150 BUS_MESSAGE_COOKIE(m),
1157 r = bus_seal_synthetic_message(bus, reply);
1161 bus->rqueue[bus->rqueue_size++] = reply;
1163 } else if (hint_sync_call) {
1164 struct kdbus_msg *k;
1166 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
1169 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1171 r = bus_kernel_make_message(bus, k);
1173 close_kdbus_msg(bus, k);
1175 /* Anybody can send us invalid messages, let's just drop them. */
1176 if (r == -EBADMSG || r == -EPROTOTYPE)
1177 log_debug_errno(r, "Ignoring invalid synchronous reply: %m");
1182 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1183 close_kdbus_msg(bus, k);
1190 static int push_name_owner_changed(
1193 const char *old_owner,
1194 const char *new_owner,
1195 const struct kdbus_timestamp *ts) {
1197 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1202 r = sd_bus_message_new_signal(
1205 "/org/freedesktop/DBus",
1206 "org.freedesktop.DBus",
1207 "NameOwnerChanged");
1211 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
1215 bus_message_set_sender_driver(bus, m);
1216 message_set_timestamp(bus, m, ts);
1218 r = bus_seal_synthetic_message(bus, m);
1222 bus->rqueue[bus->rqueue_size++] = m;
1228 static int translate_name_change(
1230 const struct kdbus_msg *k,
1231 const struct kdbus_item *d,
1232 const struct kdbus_timestamp *ts) {
1234 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
1240 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
1243 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
1245 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
1247 if (isempty(old_owner))
1252 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
1254 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts);
1257 static int translate_id_change(
1259 const struct kdbus_msg *k,
1260 const struct kdbus_item *d,
1261 const struct kdbus_timestamp *ts) {
1263 char owner[UNIQUE_NAME_MAX];
1269 sprintf(owner, ":1.%llu", d->id_change.id);
1271 return push_name_owner_changed(
1273 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
1274 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL,
1278 static int translate_reply(
1280 const struct kdbus_msg *k,
1281 const struct kdbus_item *d,
1282 const struct kdbus_timestamp *ts) {
1284 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1291 r = bus_message_new_synthetic_error(
1294 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1295 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1296 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1301 message_set_timestamp(bus, m, ts);
1303 r = bus_seal_synthetic_message(bus, m);
1307 bus->rqueue[bus->rqueue_size++] = m;
1313 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1314 static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = {
1315 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1316 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1317 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1319 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1320 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1322 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1323 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1326 struct kdbus_item *d, *found = NULL;
1327 struct kdbus_timestamp *ts = NULL;
1331 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1333 KDBUS_ITEM_FOREACH(d, k, items) {
1334 if (d->type == KDBUS_ITEM_TIMESTAMP)
1337 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1342 log_debug("Got unknown field from kernel %llu", d->type);
1346 log_debug("Didn't find a kernel message to translate.");
1350 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts);
1353 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1354 struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
1355 struct kdbus_msg *k;
1360 r = bus_rqueue_make_room(bus);
1364 if (hint_priority) {
1365 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1366 recv.priority = priority;
1369 r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
1370 if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
1371 log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
1373 if (errno == EAGAIN)
1379 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset);
1380 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1381 r = bus_kernel_make_message(bus, k);
1383 /* Anybody can send us invalid messages, let's just drop them. */
1384 if (r == -EBADMSG || r == -EPROTOTYPE) {
1385 log_debug_errno(r, "Ignoring invalid message: %m");
1389 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
1390 r = bus_kernel_translate_message(bus, k);
1392 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1397 close_kdbus_msg(bus, k);
1399 return r < 0 ? r : 1;
1402 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1403 struct memfd_cache *c;
1410 if (!bus || !bus->is_kernel)
1413 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1415 if (bus->n_memfd_cache <= 0) {
1418 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1420 r = memfd_new(bus->description);
1430 c = &bus->memfd_cache[--bus->n_memfd_cache];
1433 assert(c->mapped == 0 || c->address);
1435 *address = c->address;
1436 *mapped = c->mapped;
1437 *allocated = c->allocated;
1440 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1445 static void close_and_munmap(int fd, void *address, size_t size) {
1447 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1452 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1453 struct memfd_cache *c;
1454 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1457 assert(mapped == 0 || address);
1459 if (!bus || !bus->is_kernel) {
1460 close_and_munmap(fd, address, mapped);
1464 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1466 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1467 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1469 close_and_munmap(fd, address, mapped);
1473 c = &bus->memfd_cache[bus->n_memfd_cache++];
1475 c->address = address;
1477 /* If overly long, let's return a bit to the OS */
1478 if (mapped > max_mapped) {
1479 assert_se(memfd_set_size(fd, max_mapped) >= 0);
1480 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1481 c->mapped = c->allocated = max_mapped;
1484 c->allocated = allocated;
1487 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1490 void bus_kernel_flush_memfd(sd_bus *b) {
1495 for (i = 0; i < b->n_memfd_cache; i++)
1496 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1499 uint64_t request_name_flags_to_kdbus(uint64_t flags) {
1502 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1503 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1505 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1506 f |= KDBUS_NAME_REPLACE_EXISTING;
1508 if (flags & SD_BUS_NAME_QUEUE)
1509 f |= KDBUS_NAME_QUEUE;
1514 uint64_t attach_flags_to_kdbus(uint64_t mask) {
1517 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
1518 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
1519 m |= KDBUS_ATTACH_CREDS;
1521 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID))
1522 m |= KDBUS_ATTACH_PIDS;
1524 if (mask & SD_BUS_CREDS_COMM)
1525 m |= KDBUS_ATTACH_PID_COMM;
1527 if (mask & SD_BUS_CREDS_TID_COMM)
1528 m |= KDBUS_ATTACH_TID_COMM;
1530 if (mask & SD_BUS_CREDS_EXE)
1531 m |= KDBUS_ATTACH_EXE;
1533 if (mask & SD_BUS_CREDS_CMDLINE)
1534 m |= KDBUS_ATTACH_CMDLINE;
1536 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))
1537 m |= KDBUS_ATTACH_CGROUP;
1539 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1540 m |= KDBUS_ATTACH_CAPS;
1542 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1543 m |= KDBUS_ATTACH_SECLABEL;
1545 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1546 m |= KDBUS_ATTACH_AUDIT;
1548 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1549 m |= KDBUS_ATTACH_NAMES;
1551 if (mask & SD_BUS_CREDS_DESCRIPTION)
1552 m |= KDBUS_ATTACH_CONN_DESCRIPTION;
1554 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
1555 m |= KDBUS_ATTACH_AUXGROUPS;
1560 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1561 struct kdbus_cmd *make;
1562 struct kdbus_item *n;
1569 fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1574 make = alloca0_align(offsetof(struct kdbus_cmd, items) +
1575 ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
1576 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1577 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
1578 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
1581 make->size = offsetof(struct kdbus_cmd, items);
1583 /* Set the bloom parameters */
1585 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1586 sizeof(struct kdbus_bloom_parameter);
1587 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1588 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1589 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1591 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1592 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1594 make->size += ALIGN8(n->size);
1596 /* The buses we create make no restrictions on what metadata
1597 * peers can read from incoming messages. */
1598 n = KDBUS_ITEM_NEXT(n);
1599 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1600 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1601 n->data64[0] = _KDBUS_ATTACH_ANY;
1602 make->size += ALIGN8(n->size);
1604 /* Provide all metadata via bus-owner queries */
1605 n = KDBUS_ITEM_NEXT(n);
1606 n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
1607 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1608 n->data64[0] = _KDBUS_ATTACH_ANY;
1609 make->size += ALIGN8(n->size);
1611 /* Set the a good name */
1612 n = KDBUS_ITEM_NEXT(n);
1613 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1614 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1615 n->type = KDBUS_ITEM_MAKE_NAME;
1616 make->size += ALIGN8(n->size);
1618 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1620 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1623 /* Major API change? then the ioctls got shuffled around. */
1624 if (errno == ENOTTY)
1625 return -ESOCKTNOSUPPORT;
1633 p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
1645 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1652 len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1659 p = newa(char, len);
1661 sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1663 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1677 int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
1678 _cleanup_free_ char *path = NULL;
1679 struct kdbus_cmd *make;
1680 struct kdbus_item *n;
1684 fd = bus_kernel_open_bus_fd(bus_name, &path);
1688 make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) +
1689 ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1),
1691 make->size = ALIGN8(offsetof(struct kdbus_cmd, items));
1692 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1695 sprintf(n->str, UID_FMT "-%s", getuid(), ep_name);
1696 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1697 n->type = KDBUS_ITEM_MAKE_NAME;
1698 make->size += ALIGN8(n->size);
1701 if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
1709 p = strjoin(dirname(path), "/", name, NULL);
1721 int bus_kernel_try_close(sd_bus *bus) {
1722 struct kdbus_cmd byebye = { .size = sizeof(byebye) };
1725 assert(bus->is_kernel);
1727 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0)
1733 int bus_kernel_drop_one(int fd) {
1734 struct kdbus_cmd_recv recv = {
1735 .size = sizeof(recv),
1736 .flags = KDBUS_RECV_DROP,
1741 if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
1747 int bus_kernel_realize_attach_flags(sd_bus *bus) {
1748 struct kdbus_cmd *update;
1749 struct kdbus_item *n;
1752 assert(bus->is_kernel);
1754 update = alloca0_align(offsetof(struct kdbus_cmd, items) +
1755 ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
1759 n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
1760 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1761 n->data64[0] = bus->attach_flags;
1764 offsetof(struct kdbus_cmd, items) +
1767 if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0)
1773 int bus_kernel_fix_attach_mask(void) {
1774 _cleanup_free_ char *mask = NULL;
1775 uint64_t m = (uint64_t) -1;
1779 /* By default we don't want any kdbus metadata fields to be
1780 * suppressed, hence we reset the kernel mask for it to
1781 * (uint64_t) -1. If the module argument was overwritten by
1782 * the kernel cmdline, we leave it as is. */
1784 r = get_proc_cmdline_key("kdbus.attach_flags_mask=", &mask);
1786 return log_warning_errno(r, "Failed to read kernel command line: %m");
1789 sprintf(buf, "0x%" PRIx64 "\n", m);
1790 r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
1792 return log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
1793 "Failed to write kdbus attach mask: %m");
1799 int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
1800 struct kdbus_cmd_info cmd = {
1801 .size = sizeof(struct kdbus_cmd_info),
1803 struct kdbus_info *info;
1804 struct kdbus_item *item;
1810 assert(bus->is_kernel);
1812 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
1816 info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
1818 KDBUS_ITEM_FOREACH(item, info, items)
1819 if (item->type == KDBUS_ITEM_MAKE_NAME) {
1820 r = free_and_strdup(&n, item->str);
1824 bus_kernel_cmd_free(bus, cmd.offset);