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>
30 #include <sys/prctl.h>
35 #include "bus-internal.h"
36 #include "bus-message.h"
37 #include "bus-kernel.h"
38 #include "bus-bloom.h"
40 #include "bus-label.h"
41 #include "cgroup-util.h"
43 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
45 int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
51 if (!startswith(s, ":1."))
54 r = safe_atou64(s + 3, id);
61 static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
67 /* Note that p can be NULL, which encodes a region full of
68 * zeroes, which is useful to optimize certain padding
71 (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
72 (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
73 (*d)->vec.address = PTR_TO_UINT64(p);
76 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
79 static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) {
85 (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
86 (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
87 (*d)->memfd.fd = memfd;
88 (*d)->memfd.size = sz;
90 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
93 static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
99 (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
100 (*d)->type = KDBUS_ITEM_DST_NAME;
101 memcpy((*d)->str, s, length + 1);
103 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
106 static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
107 struct kdbus_item *i;
113 i->size = offsetof(struct kdbus_item, bloom_filter) +
114 offsetof(struct kdbus_bloom_filter, data) +
116 i->type = KDBUS_ITEM_BLOOM_FILTER;
118 *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
120 return &i->bloom_filter;
123 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
129 (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
130 (*d)->type = KDBUS_ITEM_FDS;
131 memcpy((*d)->fds, fds, sizeof(int) * n_fds);
133 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
136 static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
145 memzero(data, m->bus->bloom_size);
146 bloom->generation = 0;
148 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
151 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
153 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
155 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
156 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
157 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
160 r = sd_bus_message_rewind(m, true);
164 for (i = 0; i < 64; i++) {
167 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
170 r = sd_bus_message_peek_type(m, &type, NULL);
174 if (type != SD_BUS_TYPE_STRING &&
175 type != SD_BUS_TYPE_OBJECT_PATH &&
176 type != SD_BUS_TYPE_SIGNATURE)
179 r = sd_bus_message_read_basic(m, type, &t);
183 e = stpcpy(buf, "arg");
185 *(e++) = '0' + (char) i;
187 *(e++) = '0' + (char) (i / 10);
188 *(e++) = '0' + (char) (i % 10);
192 bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t);
194 strcpy(e, "-dot-prefix");
195 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '.');
196 strcpy(e, "-slash-prefix");
197 bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '/');
203 static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
204 struct bus_body_part *part;
205 struct kdbus_item *d;
216 /* We put this together only once, if this message is reused
217 * we reuse the earlier-built version */
221 if (m->destination) {
222 r = bus_kernel_parse_unique_name(m->destination, &unique);
230 sz = offsetof(struct kdbus_msg, items);
232 assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) ==
233 ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd)));
235 /* Add in fixed header, fields header and payload */
236 sz += (1 + m->n_body_parts) *
237 ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
239 /* Add space for bloom filter */
240 sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
241 offsetof(struct kdbus_bloom_filter, data) +
244 /* Add in well-known destination header */
246 dl = strlen(m->destination);
247 sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
250 /* Add space for unix fds */
252 sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
254 m->kdbus = memalign(8, sz);
260 m->free_kdbus = true;
261 memzero(m->kdbus, sz);
264 ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
265 ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
268 m->destination ? unique : KDBUS_DST_ID_BROADCAST;
269 m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
270 m->kdbus->cookie = (uint64_t) m->header->serial;
271 m->kdbus->priority = m->priority;
273 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
274 m->kdbus->cookie_reply = m->reply_cookie;
276 m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC;
281 append_destination(&d, m->destination, dl);
283 append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
285 MESSAGE_FOREACH_PART(part, i, m) {
287 /* If this is padding then simply send a
288 * vector with a NULL data pointer which the
289 * kernel will just pass through. This is the
290 * most efficient way to encode zeroes */
292 append_payload_vec(&d, NULL, part->size);
296 if (part->memfd >= 0 && part->sealed && m->destination) {
297 /* Try to send a memfd, if the part is
298 * sealed and this is not a broadcast. Since we can only */
300 append_payload_memfd(&d, part->memfd, part->size);
304 /* Otherwise, let's send a vector to the actual data.
305 * For that, we need to map it first. */
306 r = bus_body_part_map(part);
310 append_payload_vec(&d, part->data, part->size);
313 if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
314 struct kdbus_bloom_filter *bloom;
316 bloom = append_bloom(&d, m->bus->bloom_size);
317 r = bus_message_setup_bloom(m, bloom);
323 append_fds(&d, m->fds, m->n_fds);
325 m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
326 assert(m->kdbus->size <= sz);
335 static void unset_memfds(struct sd_bus_message *m) {
336 struct bus_body_part *part;
341 /* Make sure the memfds are not freed twice */
342 MESSAGE_FOREACH_PART(part, i, m)
343 if (part->memfd >= 0)
347 static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
348 sd_bus_message *m = NULL;
349 struct kdbus_item *d;
351 _cleanup_free_ int *fds = NULL;
352 struct bus_header *h = NULL;
353 size_t total, n_bytes = 0, idx = 0;
354 const char *destination = NULL, *seclabel = NULL;
359 assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
361 KDBUS_ITEM_FOREACH(d, k, items) {
364 l = d->size - offsetof(struct kdbus_item, data);
368 case KDBUS_ITEM_PAYLOAD_OFF:
370 h = (struct bus_header *)((uint8_t *)k + d->vec.offset);
372 if (!bus_header_is_complete(h, d->vec.size))
376 n_bytes += d->vec.size;
379 case KDBUS_ITEM_PAYLOAD_MEMFD:
383 n_bytes += d->memfd.size;
386 case KDBUS_ITEM_FDS: {
391 f = realloc(fds, sizeof(int) * (n_fds + j));
396 memcpy(fds + n_fds, d->fds, sizeof(int) * j);
401 case KDBUS_ITEM_SECLABEL:
410 r = bus_header_message_size(h, &total);
414 if (n_bytes != total)
417 /* on kdbus we only speak native endian gvariant, never dbus1
418 * marshalling or reverse endian */
419 if (h->version != 2 ||
420 h->endian != BUS_NATIVE_ENDIAN)
423 r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
427 /* The well-known names list is different from the other
428 credentials. If we asked for it, but nothing is there, this
429 means that the list of well-known names is simply empty, not
430 that we lack any data */
432 m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
434 KDBUS_ITEM_FOREACH(d, k, items) {
437 l = d->size - offsetof(struct kdbus_item, data);
441 case KDBUS_ITEM_PAYLOAD_OFF: {
444 begin_body = BUS_MESSAGE_BODY_BEGIN(m);
446 if (idx + d->vec.size > begin_body) {
447 struct bus_body_part *part;
449 /* Contains body material */
451 part = message_append_part(m);
457 /* A -1 offset is NUL padding. */
458 part->is_zero = d->vec.offset == ~0ULL;
460 if (idx >= begin_body) {
462 part->data = (uint8_t *)k + d->vec.offset;
463 part->size = d->vec.size;
466 part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx);
467 part->size = d->vec.size - (begin_body - idx);
477 case KDBUS_ITEM_PAYLOAD_MEMFD: {
478 struct bus_body_part *part;
480 if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
485 part = message_append_part(m);
491 part->memfd = d->memfd.fd;
492 part->size = d->memfd.size;
495 idx += d->memfd.size;
499 case KDBUS_ITEM_CREDS:
500 /* UID/GID/PID are always valid */
501 m->creds.uid = (uid_t) d->creds.uid;
502 m->creds.gid = (gid_t) d->creds.gid;
503 m->creds.pid = (pid_t) d->creds.pid;
504 m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask;
506 /* The PID starttime/TID might be missing
507 * however, when the data is faked by some
508 * data bus proxy and it lacks that
509 * information about the real client since
510 * SO_PEERCRED is used for that */
512 if (d->creds.starttime > 0) {
513 m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC;
514 m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask;
517 if (d->creds.tid > 0) {
518 m->creds.tid = (pid_t) d->creds.tid;
519 m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
523 case KDBUS_ITEM_TIMESTAMP:
525 if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
526 m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
527 m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
528 m->seqnum = d->timestamp.seqnum;
533 case KDBUS_ITEM_PID_COMM:
534 m->creds.comm = d->str;
535 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
538 case KDBUS_ITEM_TID_COMM:
539 m->creds.tid_comm = d->str;
540 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
544 m->creds.exe = d->str;
545 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
548 case KDBUS_ITEM_CMDLINE:
549 m->creds.cmdline = d->str;
550 m->creds.cmdline_size = l;
551 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
554 case KDBUS_ITEM_CGROUP:
555 m->creds.cgroup = d->str;
556 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;
558 r = bus_get_root_path(bus);
562 m->creds.cgroup_root = bus->cgroup_root;
566 case KDBUS_ITEM_AUDIT:
567 m->creds.audit_session_id = (uint32_t) d->audit.sessionid;
568 m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
569 m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask;
572 case KDBUS_ITEM_CAPS:
573 m->creds.capability = d->data;
574 m->creds.capability_size = l;
575 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;
578 case KDBUS_ITEM_DST_NAME:
579 if (!service_name_is_valid(d->str))
582 destination = d->str;
585 case KDBUS_ITEM_NAME:
586 if (!service_name_is_valid(d->name.name))
589 r = strv_extend(&m->creds.well_known_names, d->name.name);
594 case KDBUS_ITEM_CONN_NAME:
595 m->creds.conn_name = d->str;
596 m->creds.mask |= SD_BUS_CREDS_CONNECTION_NAME & bus->creds_mask;
600 case KDBUS_ITEM_SECLABEL:
604 log_debug("Got unknown field from kernel %llu", d->type);
608 r = bus_message_parse_fields(m);
612 /* Override information from the user header with data from the kernel */
613 if (k->src_id == KDBUS_SRC_ID_KERNEL)
614 m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
616 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
617 m->sender = m->creds.unique_name = m->sender_buffer;
621 m->destination = destination;
622 else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
623 m->destination = NULL;
624 else if (k->dst_id == KDBUS_DST_ID_NAME)
625 m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
627 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
628 m->destination = m->destination_buffer;
631 /* We take possession of the kmsg struct now */
633 m->release_kdbus = true;
637 bus->rqueue[bus->rqueue_size++] = m;
643 sd_bus_message_unref(m);
648 int bus_kernel_take_fd(sd_bus *b) {
649 struct kdbus_cmd_hello *hello;
650 struct kdbus_item *item;
651 _cleanup_free_ char *g = NULL;
653 size_t l = 0, m = 0, sz;
663 if (b->connection_name) {
664 g = bus_label_escape(b->connection_name);
672 /* If no name is explicitly set, we'll include a hint
673 * indicating the library implementation, a hint which
674 * kind of bus this is and the thread name */
676 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
679 name = b->is_system ? "sd-system" :
680 b->is_user ? "sd-user" : "sd";
682 _cleanup_free_ char *e = NULL;
684 e = bus_label_escape(pr);
688 g = strappend(b->is_system ? "sd-system-" :
689 b->is_user ? "sd-user-" : "sd-",
697 b->connection_name = bus_label_unescape(name);
698 if (!b->connection_name)
704 sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
705 ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
707 if (b->fake_creds_valid)
708 sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
711 l = strlen(b->fake_label);
712 sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
715 hello = alloca0_align(sz, 8);
717 hello->conn_flags = b->hello_flags;
718 hello->attach_flags = b->attach_flags;
719 hello->pool_size = KDBUS_POOL_SIZE;
723 item->size = offsetof(struct kdbus_item, str) + m + 1;
724 item->type = KDBUS_ITEM_CONN_NAME;
725 memcpy(item->str, name, m + 1);
726 item = KDBUS_ITEM_NEXT(item);
728 if (b->fake_creds_valid) {
729 item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
730 item->type = KDBUS_ITEM_CREDS;
731 item->creds = b->fake_creds;
733 item = KDBUS_ITEM_NEXT(item);
737 item->size = offsetof(struct kdbus_item, str) + l + 1;
738 item->type = KDBUS_ITEM_SECLABEL;
739 memcpy(item->str, b->fake_label, l+1);
742 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
746 if (!b->kdbus_buffer) {
747 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
748 if (b->kdbus_buffer == MAP_FAILED) {
749 b->kdbus_buffer = NULL;
754 /* The higher 32bit of the bus_flags fields are considered
755 * 'incompatible flags'. Refuse them all for now. */
756 if (hello->bus_flags > 0xFFFFFFFFULL)
759 if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash))
762 b->bloom_size = (size_t) hello->bloom.size;
763 b->bloom_n_hash = (unsigned) hello->bloom.n_hash;
765 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0)
768 b->unique_id = hello->id;
771 b->bus_client = true;
772 b->can_fds = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD);
773 b->message_version = 2;
774 b->message_endian = BUS_NATIVE_ENDIAN;
776 /* the kernel told us the UUID of the underlying bus */
777 memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
779 return bus_start_running(b);
782 int bus_kernel_connect(sd_bus *b) {
784 assert(b->input_fd < 0);
785 assert(b->output_fd < 0);
791 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
795 b->output_fd = b->input_fd;
797 return bus_kernel_take_fd(b);
800 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
801 struct kdbus_cmd_free cmd;
802 struct kdbus_item *d;
808 cmd.offset = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
810 KDBUS_ITEM_FOREACH(d, k, items) {
812 if (d->type == KDBUS_ITEM_FDS)
813 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
814 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
815 safe_close(d->memfd.fd);
818 (void) ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
821 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
827 assert(bus->state == BUS_RUNNING);
829 /* If we can't deliver, we want room for the error message */
830 r = bus_rqueue_make_room(bus);
834 r = bus_message_setup_kmsg(bus, m);
838 /* If this is a synchronous method call, then let's tell the
839 * kernel, so that it can pass CPU time/scheduling to the
840 * destination for the time, if it wants to. If we
841 * synchronously wait for the result anyway, we won't need CPU
844 m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY;
846 /* The kernel will return the set of supported flags in m->kdbus->flags.
847 * Save the current message flags before issuing the ioctl, and restore them
849 flags = m->kdbus->flags;
850 r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus);
851 m->kdbus->flags = flags;
853 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
854 sd_bus_message *reply;
856 if (errno == EAGAIN || errno == EINTR)
858 else if (errno == ENXIO || errno == ESRCH) {
860 /* ENXIO: unique name not known
861 * ESRCH: well-known name not known */
863 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
864 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
866 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
870 } else if (errno == EADDRNOTAVAIL) {
872 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
874 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
875 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
877 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
883 r = bus_message_new_synthetic_error(
885 BUS_MESSAGE_COOKIE(m),
892 r = bus_seal_synthetic_message(bus, reply);
896 bus->rqueue[bus->rqueue_size++] = reply;
898 } else if (hint_sync_call) {
901 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply);
904 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
906 r = bus_kernel_make_message(bus, k);
908 close_kdbus_msg(bus, k);
910 /* Anybody can send us invalid messages, let's just drop them. */
911 if (r == -EBADMSG || r == -EPROTOTYPE)
912 log_debug("Ignoring invalid message: %s", strerror(-r));
917 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
918 close_kdbus_msg(bus, k);
925 static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) {
926 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
931 r = sd_bus_message_new_signal(
934 "/org/freedesktop/DBus",
935 "org.freedesktop.DBus",
940 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
944 m->sender = "org.freedesktop.DBus";
946 r = bus_seal_synthetic_message(bus, m);
950 bus->rqueue[bus->rqueue_size++] = m;
956 static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
957 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
963 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
966 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
968 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
970 if (isempty(old_owner))
975 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
977 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner);
980 static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
981 char owner[UNIQUE_NAME_MAX];
987 sprintf(owner, ":1.%llu", d->id_change.id);
989 return push_name_owner_changed(
991 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
992 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL);
995 static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
996 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1003 r = bus_message_new_synthetic_error(
1006 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
1007 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
1008 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
1013 m->sender = "org.freedesktop.DBus";
1015 r = bus_seal_synthetic_message(bus, m);
1019 bus->rqueue[bus->rqueue_size++] = m;
1025 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
1026 struct kdbus_item *d, *found = NULL;
1028 static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = {
1029 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1030 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1031 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
1033 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1034 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
1036 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1037 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
1042 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
1044 KDBUS_ITEM_FOREACH(d, k, items) {
1045 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
1050 log_debug("Got unknown field from kernel %llu", d->type);
1054 log_debug("Didn't find a kernel message to translate.");
1058 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found);
1061 int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1062 struct kdbus_cmd_recv recv = {};
1063 struct kdbus_msg *k;
1068 r = bus_rqueue_make_room(bus);
1072 if (hint_priority) {
1073 recv.flags |= KDBUS_RECV_USE_PRIORITY;
1074 recv.priority = priority;
1077 r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv);
1079 if (errno == EAGAIN)
1085 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset);
1086 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
1087 r = bus_kernel_make_message(bus, k);
1089 /* Anybody can send us invalid messages, let's just drop them. */
1090 if (r == -EBADMSG || r == -EPROTOTYPE) {
1091 log_debug("Ignoring invalid message: %s", strerror(-r));
1095 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
1096 r = bus_kernel_translate_message(bus, k);
1098 log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
1103 close_kdbus_msg(bus, k);
1105 return r < 0 ? r : 1;
1108 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
1109 struct memfd_cache *c;
1116 if (!bus || !bus->is_kernel)
1119 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1121 if (bus->n_memfd_cache <= 0) {
1122 _cleanup_free_ char *g = NULL;
1125 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1127 assert(bus->connection_name);
1129 g = bus_label_escape(bus->connection_name);
1133 r = memfd_create(g, MFD_ALLOW_SEALING);
1143 c = &bus->memfd_cache[--bus->n_memfd_cache];
1146 assert(c->mapped == 0 || c->address);
1148 *address = c->address;
1149 *mapped = c->mapped;
1150 *allocated = c->allocated;
1153 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1158 static void close_and_munmap(int fd, void *address, size_t size) {
1160 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
1165 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
1166 struct memfd_cache *c;
1167 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
1170 assert(mapped == 0 || address);
1172 if (!bus || !bus->is_kernel) {
1173 close_and_munmap(fd, address, mapped);
1177 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
1179 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
1180 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1182 close_and_munmap(fd, address, mapped);
1186 c = &bus->memfd_cache[bus->n_memfd_cache++];
1188 c->address = address;
1190 /* If overly long, let's return a bit to the OS */
1191 if (mapped > max_mapped) {
1192 assert_se(ftruncate(fd, max_mapped) >= 0);
1193 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1194 c->mapped = c->allocated = max_mapped;
1197 c->allocated = allocated;
1200 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1203 void bus_kernel_flush_memfd(sd_bus *b) {
1208 for (i = 0; i < b->n_memfd_cache; i++)
1209 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1212 int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) {
1215 assert(kdbus_flags);
1217 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1218 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1220 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1221 f |= KDBUS_NAME_REPLACE_EXISTING;
1223 if (flags & SD_BUS_NAME_QUEUE)
1224 f |= KDBUS_NAME_QUEUE;
1230 int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) {
1235 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID))
1236 m |= KDBUS_ATTACH_CREDS;
1238 if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM))
1239 m |= KDBUS_ATTACH_COMM;
1241 if (mask & SD_BUS_CREDS_EXE)
1242 m |= KDBUS_ATTACH_EXE;
1244 if (mask & SD_BUS_CREDS_CMDLINE)
1245 m |= KDBUS_ATTACH_CMDLINE;
1247 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))
1248 m |= KDBUS_ATTACH_CGROUP;
1250 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1251 m |= KDBUS_ATTACH_CAPS;
1253 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1254 m |= KDBUS_ATTACH_SECLABEL;
1256 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1257 m |= KDBUS_ATTACH_AUDIT;
1259 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1260 m |= KDBUS_ATTACH_NAMES;
1262 if (mask & SD_BUS_CREDS_CONNECTION_NAME)
1263 m |= KDBUS_ATTACH_CONN_NAME;
1269 int bus_kernel_create_bus(const char *name, bool world, char **s) {
1270 struct kdbus_cmd_make *make;
1271 struct kdbus_item *n;
1277 fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1281 make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items) +
1282 offsetof(struct kdbus_item, data64) + sizeof(uint64_t) +
1283 offsetof(struct kdbus_item, str) +
1284 DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1),
1287 make->size = offsetof(struct kdbus_cmd_make, items);
1290 n->size = offsetof(struct kdbus_item, bloom_parameter) +
1291 sizeof(struct kdbus_bloom_parameter);
1292 n->type = KDBUS_ITEM_BLOOM_PARAMETER;
1294 n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
1295 n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
1297 assert_cc(DEFAULT_BLOOM_SIZE > 0);
1298 assert_cc(DEFAULT_BLOOM_N_HASH > 0);
1300 make->size += ALIGN8(n->size);
1302 n = KDBUS_ITEM_NEXT(n);
1303 sprintf(n->str, UID_FMT "-%s", getuid(), name);
1304 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1305 n->type = KDBUS_ITEM_MAKE_NAME;
1306 make->size += ALIGN8(n->size);
1308 make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
1310 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1318 p = strjoin("/dev/kdbus/", n->str, "/bus", NULL);
1330 static int bus_kernel_translate_access(BusPolicyAccess access) {
1331 assert(access >= 0);
1332 assert(access < _BUS_POLICY_ACCESS_MAX);
1336 case BUS_POLICY_ACCESS_SEE:
1337 return KDBUS_POLICY_SEE;
1339 case BUS_POLICY_ACCESS_TALK:
1340 return KDBUS_POLICY_TALK;
1342 case BUS_POLICY_ACCESS_OWN:
1343 return KDBUS_POLICY_OWN;
1346 assert_not_reached("Unknown policy access");
1350 static int bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbus_item *item) {
1356 switch (policy->type) {
1358 case BUSNAME_POLICY_TYPE_USER: {
1359 const char *user = policy->name;
1362 r = get_user_creds(&user, &uid, NULL, NULL, NULL);
1366 item->policy_access.type = KDBUS_POLICY_ACCESS_USER;
1367 item->policy_access.id = uid;
1371 case BUSNAME_POLICY_TYPE_GROUP: {
1372 const char *group = policy->name;
1375 r = get_group_creds(&group, &gid);
1379 item->policy_access.type = KDBUS_POLICY_ACCESS_GROUP;
1380 item->policy_access.id = gid;
1385 assert_not_reached("Unknown policy type");
1388 item->policy_access.access = bus_kernel_translate_access(policy->access);
1393 int bus_kernel_open_bus_fd(const char *bus, char **path) {
1398 len = strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
1407 sprintf(p, "/dev/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
1409 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1416 int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
1417 _cleanup_free_ char *path = NULL;
1418 struct kdbus_cmd_make *make;
1419 struct kdbus_item *n;
1423 fd = bus_kernel_open_bus_fd(bus_name, &path);
1427 size = ALIGN8(offsetof(struct kdbus_cmd_make, items));
1428 size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(ep_name) + 1);
1430 make = alloca0_align(size, 8);
1432 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1436 n->type = KDBUS_ITEM_MAKE_NAME;
1437 n->size = offsetof(struct kdbus_item, str) + strlen(ep_name) + 1;
1438 strcpy(n->str, ep_name);
1440 if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
1448 p = strjoin(dirname(path), "/", ep_name, NULL);
1460 int bus_kernel_set_endpoint_policy(int fd, uid_t uid, BusEndpoint *ep) {
1462 struct kdbus_cmd_update *update;
1463 struct kdbus_item *n;
1464 BusEndpointPolicy *po;
1469 size = ALIGN8(offsetof(struct kdbus_cmd_update, items));
1471 HASHMAP_FOREACH(po, ep->policy_hash, i) {
1472 size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(po->name) + 1);
1473 size += ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access));
1476 update = alloca0_align(size, 8);
1477 update->size = size;
1481 HASHMAP_FOREACH(po, ep->policy_hash, i) {
1482 n->type = KDBUS_ITEM_NAME;
1483 n->size = offsetof(struct kdbus_item, str) + strlen(po->name) + 1;
1484 strcpy(n->str, po->name);
1485 n = KDBUS_ITEM_NEXT(n);
1487 n->type = KDBUS_ITEM_POLICY_ACCESS;
1488 n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access);
1490 n->policy_access.type = KDBUS_POLICY_ACCESS_USER;
1491 n->policy_access.access = bus_kernel_translate_access(po->access);
1492 n->policy_access.id = uid;
1494 n = KDBUS_ITEM_NEXT(n);
1497 r = ioctl(fd, KDBUS_CMD_ENDPOINT_UPDATE, update);
1504 int bus_kernel_make_starter(
1509 BusNamePolicy *policy,
1510 BusPolicyAccess world_policy) {
1512 struct kdbus_cmd_hello *hello;
1513 struct kdbus_item *n;
1514 size_t policy_cnt = 0;
1522 LIST_FOREACH(policy, po, policy)
1525 if (world_policy >= 0)
1528 size = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
1529 ALIGN8(offsetof(struct kdbus_item, str) + strlen(name) + 1) +
1530 policy_cnt * ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access));
1532 hello = alloca0_align(size, 8);
1535 strcpy(n->str, name);
1536 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1537 n->type = KDBUS_ITEM_NAME;
1538 n = KDBUS_ITEM_NEXT(n);
1540 LIST_FOREACH(policy, po, policy) {
1541 n->type = KDBUS_ITEM_POLICY_ACCESS;
1542 n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access);
1544 r = bus_kernel_translate_policy(po, n);
1548 n = KDBUS_ITEM_NEXT(n);
1551 if (world_policy >= 0) {
1552 n->type = KDBUS_ITEM_POLICY_ACCESS;
1553 n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access);
1554 n->policy_access.type = KDBUS_POLICY_ACCESS_WORLD;
1555 n->policy_access.access = bus_kernel_translate_access(world_policy);
1560 (activating ? KDBUS_HELLO_ACTIVATOR : KDBUS_HELLO_POLICY_HOLDER) |
1561 (accept_fd ? KDBUS_HELLO_ACCEPT_FD : 0);
1562 hello->pool_size = KDBUS_POOL_SIZE;
1563 hello->attach_flags = _KDBUS_ATTACH_ALL;
1565 if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0)
1568 /* The higher 32bit of the bus_flags fields are considered
1569 * 'incompatible flags'. Refuse them all for now. */
1570 if (hello->bus_flags > 0xFFFFFFFFULL)
1573 if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash))
1579 int bus_kernel_create_domain(const char *name, char **s) {
1580 struct kdbus_cmd_make *make;
1581 struct kdbus_item *n;
1587 fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1591 make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items) +
1592 offsetof(struct kdbus_item, str) +
1597 strcpy(n->str, name);
1598 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1599 n->type = KDBUS_ITEM_MAKE_NAME;
1601 make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size);
1602 make->flags = KDBUS_MAKE_ACCESS_WORLD;
1604 if (ioctl(fd, KDBUS_CMD_DOMAIN_MAKE, make) < 0) {
1609 /* The higher 32bit of the flags field are considered
1610 * 'incompatible flags'. Refuse them all for now. */
1611 if (make->flags > 0xFFFFFFFFULL) {
1619 p = strappend("/dev/kdbus/domain/", name);
1631 int bus_kernel_try_close(sd_bus *bus) {
1633 assert(bus->is_kernel);
1635 if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0)
1641 int bus_kernel_drop_one(int fd) {
1642 struct kdbus_cmd_recv recv = {
1643 .flags = KDBUS_RECV_DROP
1648 if (ioctl(fd, KDBUS_CMD_MSG_RECV, &recv) < 0)