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 *)k + 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 *)k + d->vec.offset;
725 part->size = d->vec.size;
728 part->data = (uint8_t *)k + 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 *mapped, size_t *allocated) {
923 struct memfd_cache *c;
930 if (!bus || !bus->is_kernel)
933 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
935 if (bus->n_memfd_cache <= 0) {
938 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
940 r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &fd);
950 c = &bus->memfd_cache[--bus->n_memfd_cache];
953 assert(c->mapped == 0 || c->address);
955 *address = c->address;
957 *allocated = c->allocated;
960 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
965 static void close_and_munmap(int fd, void *address, size_t size) {
967 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
969 close_nointr_nofail(fd);
972 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
973 struct memfd_cache *c;
974 uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
977 assert(mapped == 0 || address);
979 if (!bus || !bus->is_kernel) {
980 close_and_munmap(fd, address, mapped);
984 assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
986 if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
987 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
989 close_and_munmap(fd, address, mapped);
993 c = &bus->memfd_cache[bus->n_memfd_cache++];
995 c->address = address;
997 /* If overly long, let's return a bit to the OS */
998 if (mapped > max_mapped) {
999 assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_mapped) >= 0);
1000 assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
1001 c->mapped = c->allocated = max_mapped;
1004 c->allocated = allocated;
1007 assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
1010 void bus_kernel_flush_memfd(sd_bus *b) {
1015 for (i = 0; i < b->n_memfd_cache; i++)
1016 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
1019 int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) {
1022 assert(kdbus_flags);
1024 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
1025 f |= KDBUS_NAME_ALLOW_REPLACEMENT;
1027 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
1028 f |= KDBUS_NAME_REPLACE_EXISTING;
1030 if (flags & SD_BUS_NAME_QUEUE)
1031 f |= KDBUS_NAME_QUEUE;
1037 int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) {
1042 if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID))
1043 m |= KDBUS_ATTACH_CREDS;
1045 if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM))
1046 m |= KDBUS_ATTACH_COMM;
1048 if (mask & SD_BUS_CREDS_EXE)
1049 m |= KDBUS_ATTACH_EXE;
1051 if (mask & SD_BUS_CREDS_CMDLINE)
1052 m |= KDBUS_ATTACH_CMDLINE;
1054 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))
1055 m |= KDBUS_ATTACH_CGROUP;
1057 if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
1058 m |= KDBUS_ATTACH_CAPS;
1060 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
1061 m |= KDBUS_ATTACH_SECLABEL;
1063 if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
1064 m |= KDBUS_ATTACH_AUDIT;
1066 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
1067 m |= KDBUS_ATTACH_NAMES;
1073 int bus_kernel_create_bus(const char *name, char **s) {
1074 struct kdbus_cmd_make *make;
1075 struct kdbus_item *n;
1081 fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1085 make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) +
1086 offsetof(struct kdbus_item, data64) + sizeof(uint64_t) +
1087 offsetof(struct kdbus_item, str) +
1088 DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1));
1090 make->size = offsetof(struct kdbus_cmd_make, items);
1093 n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
1094 n->type = KDBUS_ITEM_BLOOM_SIZE;
1095 n->data64[0] = BLOOM_SIZE;
1096 assert_cc(BLOOM_SIZE % 8 == 0);
1097 make->size += ALIGN8(n->size);
1099 n = KDBUS_ITEM_NEXT(n);
1100 sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name);
1101 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1102 n->type = KDBUS_ITEM_MAKE_NAME;
1103 make->size += ALIGN8(n->size);
1105 make->flags = KDBUS_MAKE_POLICY_OPEN;
1107 if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
1108 close_nointr_nofail(fd);
1112 /* The higher 32bit of the flags field are considered
1113 * 'incompatible flags'. Refuse them all for now. */
1114 if (make->flags > 0xFFFFFFFFULL) {
1115 close_nointr_nofail(fd);
1122 p = strjoin("/dev/kdbus/", n->str, "/bus", NULL);
1124 close_nointr_nofail(fd);
1134 int bus_kernel_create_starter(const char *bus, const char *name) {
1135 struct kdbus_cmd_hello *hello;
1136 struct kdbus_item *n;
1143 p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus"));
1144 sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus);
1146 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1150 hello = alloca0(ALIGN8(offsetof(struct kdbus_cmd_hello, items) +
1151 offsetof(struct kdbus_item, str) +
1155 strcpy(n->str, name);
1156 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1157 n->type = KDBUS_ITEM_NAME;
1159 hello->size = ALIGN8(offsetof(struct kdbus_cmd_hello, items) + n->size);
1160 hello->conn_flags = KDBUS_HELLO_ACTIVATOR;
1161 hello->pool_size = KDBUS_POOL_SIZE;
1163 if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) {
1164 close_nointr_nofail(fd);
1168 /* The higher 32bit of both flags fields are considered
1169 * 'incompatible flags'. Refuse them all for now. */
1170 if (hello->bus_flags > 0xFFFFFFFFULL ||
1171 hello->conn_flags > 0xFFFFFFFFULL) {
1172 close_nointr_nofail(fd);
1176 if (hello->bloom_size != BLOOM_SIZE) {
1177 close_nointr_nofail(fd);
1184 int bus_kernel_create_namespace(const char *name, char **s) {
1185 struct kdbus_cmd_make *make;
1186 struct kdbus_item *n;
1192 fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
1196 make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) +
1197 offsetof(struct kdbus_item, str) +
1201 strcpy(n->str, name);
1202 n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
1203 n->type = KDBUS_ITEM_MAKE_NAME;
1205 make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size);
1206 make->flags = KDBUS_MAKE_POLICY_OPEN | KDBUS_MAKE_ACCESS_WORLD;
1208 if (ioctl(fd, KDBUS_CMD_NS_MAKE, make) < 0) {
1209 close_nointr_nofail(fd);
1213 /* The higher 32bit of the flags field are considered
1214 * 'incompatible flags'. Refuse them all for now. */
1215 if (make->flags > 0xFFFFFFFFULL) {
1216 close_nointr_nofail(fd);
1223 p = strappend("/dev/kdbus/ns/", name);
1225 close_nointr_nofail(fd);
1235 int bus_kernel_create_monitor(const char *bus) {
1236 struct kdbus_cmd_hello *hello;
1242 p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus"));
1243 sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus);
1245 fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
1249 hello = alloca0(sizeof(struct kdbus_cmd_hello));
1250 hello->size = sizeof(struct kdbus_cmd_hello);
1251 hello->conn_flags = KDBUS_HELLO_ACTIVATOR;
1252 hello->pool_size = KDBUS_POOL_SIZE;
1254 if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) {
1255 close_nointr_nofail(fd);
1259 /* The higher 32bit of both flags fields are considered
1260 * 'incompatible flags'. Refuse them all for now. */
1261 if (hello->bus_flags > 0xFFFFFFFFULL ||
1262 hello->conn_flags > 0xFFFFFFFFULL) {
1263 close_nointr_nofail(fd);