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>
33 #include "bus-internal.h"
34 #include "bus-message.h"
35 #include "bus-kernel.h"
36 #include "bus-bloom.h"
39 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
41 int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
47 if (!startswith(s, ":1."))
50 r = safe_atou64(s + 3, id);
57 static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
63 /* Note that p can be NULL, which encodes a region full of
64 * zeroes, which is useful to optimize certain padding
67 (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
68 (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
69 (*d)->vec.address = PTR_TO_UINT64(p);
72 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
75 static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) {
81 (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
82 (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
83 (*d)->memfd.fd = memfd;
84 (*d)->memfd.size = sz;
86 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
89 static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
95 (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
96 (*d)->type = KDBUS_ITEM_DST_NAME;
97 memcpy((*d)->str, s, length + 1);
99 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
102 static void* append_bloom(struct kdbus_item **d, size_t length) {
109 (*d)->size = offsetof(struct kdbus_item, data) + length;
110 (*d)->type = KDBUS_ITEM_BLOOM;
113 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
118 static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
124 (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
125 (*d)->type = KDBUS_ITEM_FDS;
126 memcpy((*d)->fds, fds, sizeof(int) * n_fds);
128 *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
131 static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) {
138 memset(bloom, 0, BLOOM_SIZE);
140 bloom_add_pair(bloom, "message-type", bus_message_type_to_string(m->header->type));
143 bloom_add_pair(bloom, "interface", m->interface);
145 bloom_add_pair(bloom, "member", m->member);
147 bloom_add_pair(bloom, "path", m->path);
148 bloom_add_pair(bloom, "path-slash-prefix", m->path);
149 bloom_add_prefixes(bloom, "path-slash-prefix", m->path, '/');
152 r = sd_bus_message_rewind(m, true);
156 for (i = 0; i < 64; i++) {
159 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
162 r = sd_bus_message_peek_type(m, &type, NULL);
166 if (type != SD_BUS_TYPE_STRING &&
167 type != SD_BUS_TYPE_OBJECT_PATH &&
168 type != SD_BUS_TYPE_SIGNATURE)
171 r = sd_bus_message_read_basic(m, type, &t);
175 e = stpcpy(buf, "arg");
179 *(e++) = '0' + (i / 10);
180 *(e++) = '0' + (i % 10);
184 bloom_add_pair(bloom, buf, t);
186 strcpy(e, "-dot-prefix");
187 bloom_add_prefixes(bloom, buf, t, '.');
188 strcpy(e, "-slash-prefix");
189 bloom_add_prefixes(bloom, buf, t, '/');
195 static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
196 struct bus_body_part *part;
197 struct kdbus_item *d;
211 if (m->destination) {
212 r = bus_kernel_parse_unique_name(m->destination, &unique);
220 sz = offsetof(struct kdbus_msg, items);
222 assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) ==
223 ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd)));
225 /* Add in fixed header, fields header and payload */
226 sz += (1 + m->n_body_parts) *
227 ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
229 /* Add space for bloom filter */
230 sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE);
232 /* Add in well-known destination header */
234 dl = strlen(m->destination);
235 sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
238 /* Add space for unix fds */
240 sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
242 m->kdbus = memalign(8, sz);
248 m->free_kdbus = true;
249 memset(m->kdbus, 0, sz);
252 ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
253 ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
256 m->destination ? unique : KDBUS_DST_ID_BROADCAST;
257 m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
258 m->kdbus->cookie = m->header->serial;
260 m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC;
265 append_destination(&d, m->destination, dl);
267 append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
269 MESSAGE_FOREACH_PART(part, i, m) {
271 /* If this is padding then simply send a
272 * vector with a NULL data pointer which the
273 * kernel will just pass through. This is the
274 * most efficient way to encode zeroes */
276 append_payload_vec(&d, NULL, part->size);
280 if (part->memfd >= 0 && part->sealed && m->destination) {
281 /* Try to send a memfd, if the part is
282 * sealed and this is not a broadcast. Since we can only */
284 append_payload_memfd(&d, part->memfd, part->size);
288 /* Otherwise let's send a vector to the actual data,
289 * for that we need to map it first. */
290 r = bus_body_part_map(part);
294 append_payload_vec(&d, part->data, part->size);
297 if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
300 p = append_bloom(&d, BLOOM_SIZE);
301 r = bus_message_setup_bloom(m, p);
307 append_fds(&d, m->fds, m->n_fds);
309 m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
310 assert(m->kdbus->size <= sz);
319 int bus_kernel_take_fd(sd_bus *b) {
320 struct kdbus_cmd_hello hello;
331 hello.size = sizeof(hello);
332 hello.conn_flags = b->hello_flags;
333 hello.attach_flags = b->attach_flags;
334 hello.pool_size = KDBUS_POOL_SIZE;
336 r = ioctl(b->input_fd, KDBUS_CMD_HELLO, &hello);
340 if (!b->kdbus_buffer) {
341 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
342 if (b->kdbus_buffer == MAP_FAILED) {
343 b->kdbus_buffer = NULL;
348 /* The higher 32bit of both flags fields are considered
349 * 'incompatible flags'. Refuse them all for now. */
350 if (hello.bus_flags > 0xFFFFFFFFULL ||
351 hello.conn_flags > 0xFFFFFFFFULL)
354 if (hello.bloom_size != BLOOM_SIZE)
357 if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello.id) < 0)
360 b->unique_id = hello.id;
363 b->bus_client = true;
364 b->can_fds = !!(hello.conn_flags & KDBUS_HELLO_ACCEPT_FD);
365 b->message_version = 2;
366 b->message_endian = BUS_NATIVE_ENDIAN;
368 /* the kernel told us the UUID of the underlying bus */
369 memcpy(b->server_id.bytes, hello.id128, sizeof(b->server_id.bytes));
371 return bus_start_running(b);
374 int bus_kernel_connect(sd_bus *b) {
376 assert(b->input_fd < 0);
377 assert(b->output_fd < 0);
383 b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
387 b->output_fd = b->input_fd;
389 return bus_kernel_take_fd(b);
392 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {
397 assert(bus->state == BUS_RUNNING);
399 /* If we can't deliver, we want room for the error message */
400 r = bus_rqueue_make_room(bus);
404 r = bus_message_setup_kmsg(bus, m);
408 r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus);
410 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
411 sd_bus_message *reply;
413 if (errno == EAGAIN || errno == EINTR)
415 else if (errno == ENXIO || errno == ESRCH) {
417 /* ENXIO: unique name not known
418 * ESRCH: well-known name not known */
420 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
421 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
423 log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
427 } else if (errno == EADDRNOTAVAIL) {
429 /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
431 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
432 sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
434 log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
440 r = bus_message_new_synthetic_error(
442 BUS_MESSAGE_SERIAL(m),
449 r = bus_seal_synthetic_message(bus, reply);
453 bus->rqueue[bus->rqueue_size++] = reply;
461 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
463 struct kdbus_item *d;
468 off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
469 ioctl(bus->input_fd, KDBUS_CMD_FREE, &off);
471 KDBUS_ITEM_FOREACH(d, k, items) {
473 if (d->type == KDBUS_ITEM_FDS)
474 close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
475 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
476 close_nointr_nofail(d->memfd.fd);
480 static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) {
481 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
486 r = sd_bus_message_new_signal(
488 "/org/freedesktop/DBus",
489 "org.freedesktop.DBus",
495 r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
499 m->sender = "org.freedesktop.DBus";
501 r = bus_seal_synthetic_message(bus, m);
505 bus->rqueue[bus->rqueue_size++] = m;
511 static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
512 char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
518 if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
521 sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old.id);
523 if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
525 if (isempty(old_owner))
530 sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new.id);
532 return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner);
535 static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
536 char owner[UNIQUE_NAME_MAX];
542 sprintf(owner, ":1.%llu", d->id_change.id);
544 return push_name_owner_changed(
546 d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
547 d->type == KDBUS_ITEM_ID_ADD ? owner : NULL);
550 static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
551 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
558 r = bus_message_new_synthetic_error(
561 d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
562 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
563 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
568 m->sender = "org.freedesktop.DBus";
570 r = bus_seal_synthetic_message(bus, m);
574 bus->rqueue[bus->rqueue_size++] = m;
580 static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
581 struct kdbus_item *d, *found = NULL;
583 static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = {
584 [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
585 [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
586 [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
588 [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
589 [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
591 [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
592 [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
597 assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
599 KDBUS_ITEM_FOREACH(d, k, items) {
600 if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
605 log_debug("Got unknown field from kernel %llu", d->type);
609 log_debug("Didn't find a kernel message to translate.");
613 return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found);
616 static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
617 sd_bus_message *m = NULL;
618 struct kdbus_item *d;
620 _cleanup_free_ int *fds = NULL;
621 struct bus_header *h = NULL;
622 size_t total, n_bytes = 0, idx = 0;
623 const char *destination = NULL, *seclabel = NULL;
628 assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
630 KDBUS_ITEM_FOREACH(d, k, items) {
633 l = d->size - offsetof(struct kdbus_item, data);
637 case KDBUS_ITEM_PAYLOAD_OFF:
639 h = (struct bus_header *)((uint8_t *)bus->kdbus_buffer + d->vec.offset);
641 if (!bus_header_is_complete(h, d->vec.size))
645 n_bytes += d->vec.size;
648 case KDBUS_ITEM_PAYLOAD_MEMFD:
652 n_bytes += d->memfd.size;
655 case KDBUS_ITEM_FDS: {
660 f = realloc(fds, sizeof(int) * (n_fds + j));
665 memcpy(fds + n_fds, d->fds, sizeof(int) * j);
670 case KDBUS_ITEM_SECLABEL:
679 r = bus_header_message_size(h, &total);
683 if (n_bytes != total)
686 /* on kdbus we only speak native endian gvariant, never dbus1
687 * marshalling or reverse endian */
688 if (h->version != 2 ||
689 h->endian != BUS_NATIVE_ENDIAN)
692 r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
696 KDBUS_ITEM_FOREACH(d, k, items) {
699 l = d->size - offsetof(struct kdbus_item, data);
703 case KDBUS_ITEM_PAYLOAD_OFF: {
706 begin_body = BUS_MESSAGE_BODY_BEGIN(m);
708 if (idx + d->vec.size > begin_body) {
709 struct bus_body_part *part;
711 /* Contains body material */
713 part = message_append_part(m);
719 /* A -1 offset is NUL padding. */
720 part->is_zero = d->vec.offset == ~0ULL;
722 if (idx >= begin_body) {
724 part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset;
725 part->size = d->vec.size;
728 part->data = (uint8_t *)bus->kdbus_buffer + d->vec.offset + (begin_body - idx);
729 part->size = d->vec.size - (begin_body - idx);
739 case KDBUS_ITEM_PAYLOAD_MEMFD: {
740 struct bus_body_part *part;
742 if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
747 part = message_append_part(m);
753 part->memfd = d->memfd.fd;
754 part->size = d->memfd.size;
757 idx += d->memfd.size;
761 case KDBUS_ITEM_CREDS:
762 m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC;
763 m->creds.uid = d->creds.uid;
764 m->creds.gid = d->creds.gid;
765 m->creds.pid = d->creds.pid;
766 m->creds.tid = d->creds.tid;
767 m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID) & bus->creds_mask;
770 case KDBUS_ITEM_TIMESTAMP:
771 m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
772 m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
775 case KDBUS_ITEM_PID_COMM:
776 m->creds.comm = d->str;
777 m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
780 case KDBUS_ITEM_TID_COMM:
781 m->creds.tid_comm = d->str;
782 m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
786 m->creds.exe = d->str;
787 m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
790 case KDBUS_ITEM_CMDLINE:
791 m->creds.cmdline = d->str;
792 m->creds.cmdline_size = l;
793 m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
796 case KDBUS_ITEM_CGROUP:
797 m->creds.cgroup = d->str;
798 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;
801 case KDBUS_ITEM_AUDIT:
802 m->creds.audit_session_id = d->audit.sessionid;
803 m->creds.audit_login_uid = d->audit.loginuid;
804 m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask;
807 case KDBUS_ITEM_CAPS:
808 m->creds.capability = d->data;
809 m->creds.capability_size = l;
810 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;
813 case KDBUS_ITEM_DST_NAME:
814 destination = d->str;
817 case KDBUS_ITEM_NAME:
818 r = strv_extend(&m->creds.well_known_names, d->name.name);
821 m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES & bus->creds_mask;
825 case KDBUS_ITEM_SECLABEL:
829 log_debug("Got unknown field from kernel %llu", d->type);
833 r = bus_message_parse_fields(m);
837 /* Override information from the user header with data from the kernel */
838 if (k->src_id == KDBUS_SRC_ID_KERNEL)
839 m->sender = "org.freedesktop.DBus";
841 snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
842 m->sender = m->creds.unique_name = m->sender_buffer;
843 m->creds.mask |= SD_BUS_CREDS_UNIQUE_NAME & bus->creds_mask;
846 if (!m->destination) {
848 m->destination = destination;
849 else if (k->dst_id != KDBUS_DST_ID_NAME &&
850 k->dst_id != KDBUS_DST_ID_BROADCAST) {
851 snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
852 m->destination = m->destination_buffer;
856 /* We take possession of the kmsg struct now */
858 m->release_kdbus = true;
862 bus->rqueue[bus->rqueue_size++] = m;
868 struct bus_body_part *part;
871 /* Make sure the memfds are not freed twice */
872 MESSAGE_FOREACH_PART(part, i, m)
873 if (part->memfd >= 0)
876 sd_bus_message_unref(m);
882 int bus_kernel_read_message(sd_bus *bus) {
889 r = bus_rqueue_make_room(bus);
893 r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &off);
900 k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off);
902 if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
903 r = bus_kernel_make_message(bus, k);
905 /* Anybody can send us invalid messages, let's just drop them. */
906 if (r == -EBADMSG || r == -EPROTOTYPE) {
907 log_debug("Ignoring invalid message: %s", strerror(-r));
911 } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
912 r = bus_kernel_translate_message(bus, k);
917 close_kdbus_msg(bus, k);
919 return r < 0 ? r : 1;
922 int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size) {
923 struct memfd_cache *c;
929 if (!bus || !bus->is_kernel)
932 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
934 if (bus->n_memfd_cache <= 0) {
937 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
939 r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &fd);
948 c = &bus->memfd_cache[--bus->n_memfd_cache];
951 assert(c->size == 0 || c->address);
953 *address = c->address;
957 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
962 static void close_and_munmap(int fd, void *address, size_t size) {
964 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
966 close_nointr_nofail(fd);
969 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size) {
970 struct memfd_cache *c;
971 uint64_t max_sz = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
974 assert(size == 0 || address);
976 if (!bus || !bus->is_kernel) {
977 close_and_munmap(fd, address, size);
981 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
983 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
984 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
986 close_and_munmap(fd, address, size);
990 c = &bus->memfd_cache[bus->n_memfd_cache++];
992 c->address = address;
994 /* If overly long, let's return a bit to the OS */
996 assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_sz) >= 0);
997 assert_se(munmap((uint8_t*) address + max_sz, PAGE_ALIGN(size - max_sz)) >= 0);
1002 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1005 void bus_kernel_flush_memfd(sd_bus *b) {
1010 for (i = 0; i < b->n_memfd_cache; i++)
1011 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].size);
1014 int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) {
1017 assert(kdbus_flags);
1019 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1020 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1022 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1023 f |= KDBUS_NAME_REPLACE_EXISTING;
1025 if (flags & SD_BUS_NAME_QUEUE)
1026 f |= KDBUS_NAME_QUEUE;
1032 int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) {
1037 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID))
1038 m |= KDBUS_ATTACH_CREDS;
1040 if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM))
1041 m |= KDBUS_ATTACH_COMM;
1043 if (mask & SD_BUS_CREDS_EXE)
1044 m |= KDBUS_ATTACH_EXE;
1046 if (mask & SD_BUS_CREDS_CMDLINE)
1047 m |= KDBUS_ATTACH_CMDLINE;
1049 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))
1050 m |= KDBUS_ATTACH_CGROUP;
1052 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1053 m |= KDBUS_ATTACH_CAPS;
1055 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1056 m |= KDBUS_ATTACH_SECLABEL;
1058 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1059 m |= KDBUS_ATTACH_AUDIT;
1061 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1062 m |= KDBUS_ATTACH_NAMES;
1068 int bus_kernel_create_bus(const char *name, char **s) {
1069 struct kdbus_cmd_make *make;
1070 struct kdbus_item *n;
1076 fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1080 make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) +
1081 offsetof(struct kdbus_item, data64) + sizeof(uint64_t) +
1082 offsetof(struct kdbus_item, str) +
1083 DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1));
1085 make->size = offsetof(struct kdbus_cmd_make, items);
1088 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1089 n->type = KDBUS_ITEM_BLOOM_SIZE;
1090 n->data64[0] = BLOOM_SIZE;
1091 assert_cc(BLOOM_SIZE % 8 == 0);
1092 make->size += ALIGN8(n->size);
1094 n = KDBUS_ITEM_NEXT(n);
1095 sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name);
1096 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1097 n->type = KDBUS_ITEM_MAKE_NAME;
1098 make->size += ALIGN8(n->size);
1100 make->flags = KDBUS_MAKE_POLICY_OPEN;
1102 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1103 close_nointr_nofail(fd);
1107 /* The higher 32bit of the flags field are considered
1108 * 'incompatible flags'. Refuse them all for now. */
1109 if (make->flags > 0xFFFFFFFFULL) {
1110 close_nointr_nofail(fd);
1117 p = strjoin("/dev/kdbus/", n->str, "/bus", NULL);
1119 close_nointr_nofail(fd);
1129 int bus_kernel_create_starter(const char *bus, const char *name) {
1130 struct kdbus_cmd_hello *hello;
1131 struct kdbus_item *n;
1138 p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus"));
1139 sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus);
1141 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1145 hello = alloca0(ALIGN8(offsetof(struct kdbus_cmd_hello, items) +
1146 offsetof(struct kdbus_item, str) +
1150 strcpy(n->str, name);
1151 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1152 n->type = KDBUS_ITEM_NAME;
1154 hello->size = ALIGN8(offsetof(struct kdbus_cmd_hello, items) + n->size);
1155 hello->conn_flags = KDBUS_HELLO_ACTIVATOR;
1156 hello->pool_size = KDBUS_POOL_SIZE;
1158 if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) {
1159 close_nointr_nofail(fd);
1163 /* The higher 32bit of both flags fields are considered
1164 * 'incompatible flags'. Refuse them all for now. */
1165 if (hello->bus_flags > 0xFFFFFFFFULL ||
1166 hello->conn_flags > 0xFFFFFFFFULL) {
1167 close_nointr_nofail(fd);
1171 if (hello->bloom_size != BLOOM_SIZE) {
1172 close_nointr_nofail(fd);
1179 int bus_kernel_create_namespace(const char *name, char **s) {
1180 struct kdbus_cmd_make *make;
1181 struct kdbus_item *n;
1187 fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1191 make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) +
1192 offsetof(struct kdbus_item, str) +
1196 strcpy(n->str, name);
1197 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1198 n->type = KDBUS_ITEM_MAKE_NAME;
1200 make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size);
1201 make->flags = KDBUS_MAKE_POLICY_OPEN | KDBUS_MAKE_ACCESS_WORLD;
1203 if (ioctl(fd, KDBUS_CMD_NS_MAKE, make) < 0) {
1204 close_nointr_nofail(fd);
1208 /* The higher 32bit of the flags field are considered
1209 * 'incompatible flags'. Refuse them all for now. */
1210 if (make->flags > 0xFFFFFFFFULL) {
1211 close_nointr_nofail(fd);
1218 p = strappend("/dev/kdbus/ns/", name);
1220 close_nointr_nofail(fd);
1230 int bus_kernel_create_monitor(const char *bus) {
1231 struct kdbus_cmd_hello *hello;
1237 p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus"));
1238 sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus);
1240 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1244 hello = alloca0(sizeof(struct kdbus_cmd_hello));
1245 hello->size = sizeof(struct kdbus_cmd_hello);
1246 hello->conn_flags = KDBUS_HELLO_ACTIVATOR;
1247 hello->pool_size = KDBUS_POOL_SIZE;
1249 if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) {
1250 close_nointr_nofail(fd);
1254 /* The higher 32bit of both flags fields are considered
1255 * 'incompatible flags'. Refuse them all for now. */
1256 if (hello->bus_flags > 0xFFFFFFFFULL ||
1257 hello->conn_flags > 0xFFFFFFFFULL) {
1258 close_nointr_nofail(fd);