X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd-bus%2Fbus-kernel.c;h=7d514616a4d7c08bee2e8f597375947046fb422b;hp=8a0f0859766858ebd54bbfef72c35cdcc88b52a4;hb=8e959fbf3862172b53d200cda659795c3744fa78;hpb=219728b31b853e1ecbf6fd1d61bfdc49d7d07318 diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c index 8a0f08597..7d514616a 100644 --- a/src/libsystemd-bus/bus-kernel.c +++ b/src/libsystemd-bus/bus-kernel.c @@ -28,6 +28,7 @@ #include #include "util.h" +#include "strv.h" #include "bus-internal.h" #include "bus-message.h" @@ -248,12 +249,12 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { memset(m->kdbus, 0, sz); m->kdbus->flags = - ((m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | - ((m->header->flags & SD_BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); + ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | + ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); m->kdbus->dst_id = well_known ? 0 : m->destination ? unique : KDBUS_DST_ID_BROADCAST; - m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS1; + m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; m->kdbus->cookie = m->header->serial; m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC; @@ -361,15 +362,13 @@ int bus_kernel_take_fd(sd_bus *b) { b->is_kernel = true; b->bus_client = true; b->can_fds = !!(hello.conn_flags & KDBUS_HELLO_ACCEPT_FD); + b->message_version = 2; + b->message_endian = BUS_NATIVE_ENDIAN; /* the kernel told us the UUID of the underlying bus */ memcpy(b->server_id.bytes, hello.id128, sizeof(b->server_id.bytes)); - r = bus_start_running(b); - if (r < 0) - return r; - - return 1; + return bus_start_running(b); } int bus_kernel_connect(sd_bus *b) { @@ -397,13 +396,64 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) { assert(m); assert(bus->state == BUS_RUNNING); + /* If we can't deliver, we want room for the error message */ + r = bus_rqueue_make_room(bus); + if (r < 0) + return r; + r = bus_message_setup_kmsg(bus, m); if (r < 0) return r; r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus); - if (r < 0) - return errno == EAGAIN ? 0 : -errno; + if (r < 0) { + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + sd_bus_message *reply; + + if (errno == EAGAIN || errno == EINTR) + return 0; + else if (errno == ENXIO || errno == ESRCH) { + + /* ENXIO: unique name not known + * ESRCH: well-known name not known */ + + if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) + sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); + else { + log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); + return 0; + } + + } else if (errno == EADDRNOTAVAIL) { + + /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ + + if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) + sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); + else { + log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); + return 0; + } + } else + return -errno; + + r = bus_message_new_synthetic_error( + bus, + BUS_MESSAGE_SERIAL(m), + &error, + &reply); + + if (r < 0) + return r; + + r = bus_seal_synthetic_message(bus, reply); + if (r < 0) + return r; + + bus->rqueue[bus->rqueue_size++] = reply; + + return 0; + } return 1; } @@ -416,9 +466,9 @@ static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { assert(k); off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; - ioctl(bus->input_fd, KDBUS_CMD_MSG_RELEASE, &off); + ioctl(bus->input_fd, KDBUS_CMD_FREE, &off); - KDBUS_PART_FOREACH(d, k, items) { + KDBUS_ITEM_FOREACH(d, k, items) { if (d->type == KDBUS_ITEM_FDS) close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); @@ -448,85 +498,36 @@ static int push_name_owner_changed(sd_bus *bus, const char *name, const char *ol m->sender = "org.freedesktop.DBus"; - r = bus_seal_message(bus, m); - if (r < 0) - return r; - - r = bus_rqueue_push(bus, m); + r = bus_seal_synthetic_message(bus, m); if (r < 0) return r; + bus->rqueue[bus->rqueue_size++] = m; m = NULL; - return 1; -} -static int push_name_name_acquired(sd_bus *bus, const char *signal, const char *name) { - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - assert(bus); - - r = sd_bus_message_new_signal( - bus, - "/org/freedesktop/DBus", - "org.freedesktop.DBus", - signal, - &m); - - if (r < 0) - return r; - - r = sd_bus_message_append(m, "ss", name); - if (r < 0) - return r; - - m->sender = "org.freedesktop.DBus"; - - r = bus_seal_message(bus, m); - if (r < 0) - return r; - - r = bus_rqueue_push(bus, m); - if (r < 0) - return r; - - m = NULL; return 1; } static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; - int r; assert(bus); assert(k); assert(d); - if (d->name_change.flags != 0) - return 0; - - /* First generate NameAcquired/NameList messages */ - if (d->type == KDBUS_ITEM_NAME_ADD && d->name_change.new_id == bus->unique_id) { - r = push_name_name_acquired(bus, "NameAcquired", d->name_change.name); - if (r < 0) - return r; - - } else if (d->type == KDBUS_ITEM_NAME_REMOVE && d->name_change.old_id == bus->unique_id) { - r = push_name_name_acquired(bus, "NameLost", d->name_change.name); - if (r < 0) - return r; - } - - /* Then, generate NameOwnerChanged messages */ - if (d->type == KDBUS_ITEM_NAME_ADD) + if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) old_owner[0] = 0; else - sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id); + sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old.id); + + if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { + + if (isempty(old_owner)) + return 0; - if (d->type == KDBUS_ITEM_NAME_REMOVE) new_owner[0] = 0; - else - sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id); + } else + sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new.id); return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner); } @@ -566,15 +567,13 @@ static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item * m->sender = "org.freedesktop.DBus"; - r = bus_seal_message(bus, m); - if (r < 0) - return r; - - r = bus_rqueue_push(bus, m); + r = bus_seal_synthetic_message(bus, m); if (r < 0) return r; + bus->rqueue[bus->rqueue_size++] = m; m = NULL; + return 1; } @@ -597,7 +596,7 @@ static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { assert(k); assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); - KDBUS_PART_FOREACH(d, k, items) { + KDBUS_ITEM_FOREACH(d, k, items) { if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { if (found) return -EBADMSG; @@ -614,39 +613,6 @@ static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found); } -int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { - - uint64_t m = 0; - - SET_FLAG(m, KDBUS_ATTACH_CREDS, - !!(mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID))); - - SET_FLAG(m, KDBUS_ATTACH_COMM, - !!(mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM))); - - SET_FLAG(m, KDBUS_ATTACH_EXE, - !!(mask & SD_BUS_CREDS_EXE)); - - SET_FLAG(m, KDBUS_ATTACH_CMDLINE, - !!(mask & SD_BUS_CREDS_CMDLINE)); - - SET_FLAG(m, KDBUS_ATTACH_CGROUP, - !!(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))); - - SET_FLAG(m, KDBUS_ATTACH_CAPS, - !!(mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))); - - SET_FLAG(m, KDBUS_ATTACH_SECLABEL, - !!(mask & SD_BUS_CREDS_SELINUX_CONTEXT)); - - SET_FLAG(m, KDBUS_ATTACH_AUDIT, - !!(mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))); - - *kdbus_mask = m; - - return 0; -} - static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { sd_bus_message *m = NULL; struct kdbus_item *d; @@ -659,9 +625,9 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { assert(bus); assert(k); - assert(k->payload_type == KDBUS_PAYLOAD_DBUS1); + assert(k->payload_type == KDBUS_PAYLOAD_DBUS); - KDBUS_PART_FOREACH(d, k, items) { + KDBUS_ITEM_FOREACH(d, k, items) { size_t l; l = d->size - offsetof(struct kdbus_item, data); @@ -717,11 +683,17 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { if (n_bytes != total) return -EBADMSG; + /* on kdbus we only speak native endian gvariant, never dbus1 + * marshalling or reverse endian */ + if (h->version != 2 || + h->endian != BUS_NATIVE_ENDIAN) + return -EPROTOTYPE; + r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); if (r < 0) return r; - KDBUS_PART_FOREACH(d, k, items) { + KDBUS_ITEM_FOREACH(d, k, items) { size_t l; l = d->size - offsetof(struct kdbus_item, data); @@ -817,7 +789,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { case KDBUS_ITEM_CMDLINE: m->creds.cmdline = d->str; - m->creds.cmdline_length = l; + m->creds.cmdline_size = l; m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; break; @@ -842,9 +814,15 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { destination = d->str; break; + case KDBUS_ITEM_NAME: + r = strv_extend(&m->creds.well_known_names, d->name.name); + if (r < 0) + goto fail; + m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES & bus->creds_mask; + break; + case KDBUS_ITEM_FDS: case KDBUS_ITEM_SECLABEL: - case KDBUS_ITEM_NAMES: break; default: @@ -856,17 +834,19 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { if (r < 0) goto fail; + /* Override information from the user header with data from the kernel */ if (k->src_id == KDBUS_SRC_ID_KERNEL) m->sender = "org.freedesktop.DBus"; else { snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); - m->sender = m->sender_buffer; + m->sender = m->creds.unique_name = m->sender_buffer; + m->creds.mask |= SD_BUS_CREDS_UNIQUE_NAME & bus->creds_mask; } if (!m->destination) { if (destination) m->destination = destination; - else if (k->dst_id != KDBUS_DST_ID_WELL_KNOWN_NAME && + else if (k->dst_id != KDBUS_DST_ID_NAME && k->dst_id != KDBUS_DST_ID_BROADCAST) { snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); m->destination = m->destination_buffer; @@ -877,12 +857,9 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { m->kdbus = k; m->release_kdbus = true; m->free_fds = true; - fds = NULL; - r = bus_rqueue_push(bus, m); - if (r < 0) - goto fail; + bus->rqueue[bus->rqueue_size++] = m; return 1; @@ -909,12 +886,7 @@ int bus_kernel_read_message(sd_bus *bus) { assert(bus); - /* Kernel messages might result in 2 new queued messages in - * the worst case (NameOwnerChange and LostName for the same - * well-known name, for example). Let's make room in - * advance. */ - - r = bus_rqueue_make_room(bus, 2); + r = bus_rqueue_make_room(bus); if (r < 0) return r; @@ -927,9 +899,16 @@ int bus_kernel_read_message(sd_bus *bus) { } k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off); - if (k->payload_type == KDBUS_PAYLOAD_DBUS1) + if (k->payload_type == KDBUS_PAYLOAD_DBUS) { r = bus_kernel_make_message(bus, k); - else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) + + /* Anybody can send us invalid messages, let's just drop them. */ + if (r == -EBADMSG || r == -EPROTOTYPE) { + log_debug("Ignoring invalid message: %s", strerror(-r)); + r = 0; + } + + } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) r = bus_kernel_translate_message(bus, k); else r = 0; @@ -940,58 +919,13 @@ int bus_kernel_read_message(sd_bus *bus) { return r < 0 ? r : 1; } -int bus_kernel_create(const char *name, char **s) { - struct kdbus_cmd_bus_make *make; - struct kdbus_item *n; - size_t l; - int fd; - char *p; - - assert(name); - assert(s); - - fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return -errno; - - l = strlen(name); - make = alloca0(offsetof(struct kdbus_cmd_bus_make, items) + - KDBUS_PART_HEADER_SIZE + sizeof(uint64_t) + - KDBUS_PART_HEADER_SIZE + DECIMAL_STR_MAX(uid_t) + 1 + l + 1); - - n = make->items; - n->type = KDBUS_MAKE_NAME; - sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name); - n->size = KDBUS_PART_HEADER_SIZE + strlen(n->str) + 1; - - make->size = offsetof(struct kdbus_cmd_bus_make, items) + n->size; - make->flags = KDBUS_MAKE_POLICY_OPEN; - make->bus_flags = 0; - make->bloom_size = BLOOM_SIZE; - assert_cc(BLOOM_SIZE % 8 == 0); - - p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); - if (!p) - return -ENOMEM; - - if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { - close_nointr_nofail(fd); - free(p); - return -errno; - } - - if (s) - *s = p; - - return fd; -} - -int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size) { +int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { struct memfd_cache *c; int fd; assert(address); - assert(size); + assert(mapped); + assert(allocated); if (!bus || !bus->is_kernel) return -ENOTSUP; @@ -1008,17 +942,19 @@ int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size) { return -errno; *address = NULL; - *size = 0; + *mapped = 0; + *allocated = 0; return fd; } c = &bus->memfd_cache[--bus->n_memfd_cache]; assert(c->fd >= 0); - assert(c->size == 0 || c->address); + assert(c->mapped == 0 || c->address); *address = c->address; - *size = c->size; + *mapped = c->mapped; + *allocated = c->allocated; fd = c->fd; assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); @@ -1033,15 +969,15 @@ static void close_and_munmap(int fd, void *address, size_t size) { close_nointr_nofail(fd); } -void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size) { +void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { struct memfd_cache *c; - uint64_t max_sz = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); + uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); assert(fd >= 0); - assert(size == 0 || address); + assert(mapped == 0 || address); if (!bus || !bus->is_kernel) { - close_and_munmap(fd, address, size); + close_and_munmap(fd, address, mapped); return; } @@ -1050,7 +986,7 @@ void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size) { if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); - close_and_munmap(fd, address, size); + close_and_munmap(fd, address, mapped); return; } @@ -1059,12 +995,14 @@ void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size) { c->address = address; /* If overly long, let's return a bit to the OS */ - if (size > max_sz) { - assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_sz) >= 0); - assert_se(munmap((uint8_t*) address + max_sz, PAGE_ALIGN(size - max_sz)) >= 0); - c->size = max_sz; - } else - c->size = size; + if (mapped > max_mapped) { + assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_mapped) >= 0); + assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); + c->mapped = c->allocated = max_mapped; + } else { + c->mapped = mapped; + c->allocated = allocated; + } assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); } @@ -1075,23 +1013,256 @@ void bus_kernel_flush_memfd(sd_bus *b) { assert(b); for (i = 0; i < b->n_memfd_cache; i++) - close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].size); + close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); } -int kdbus_translate_request_name_flags(uint64_t sd_bus_flags, uint64_t *kdbus_flags) { +int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) { + uint64_t f = 0; - assert_return(kdbus_flags != NULL, -EINVAL); + assert(kdbus_flags); - *kdbus_flags = 0; + if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) + f |= KDBUS_NAME_ALLOW_REPLACEMENT; - if (sd_bus_flags & SD_BUS_NAME_ALLOW_REPLACEMENT) - *kdbus_flags |= KDBUS_NAME_ALLOW_REPLACEMENT; + if (flags & SD_BUS_NAME_REPLACE_EXISTING) + f |= KDBUS_NAME_REPLACE_EXISTING; - if (sd_bus_flags & SD_BUS_NAME_REPLACE_EXISTING) - *kdbus_flags |= KDBUS_NAME_REPLACE_EXISTING; + if (flags & SD_BUS_NAME_QUEUE) + f |= KDBUS_NAME_QUEUE; - if (!(sd_bus_flags & SD_BUS_NAME_DO_NOT_QUEUE)) - *kdbus_flags |= KDBUS_NAME_QUEUE; + *kdbus_flags = f; + return 0; +} + +int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { + uint64_t m = 0; + + assert(kdbus_mask); + + if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) + m |= KDBUS_ATTACH_CREDS; + + if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)) + m |= KDBUS_ATTACH_COMM; + + if (mask & SD_BUS_CREDS_EXE) + m |= KDBUS_ATTACH_EXE; + if (mask & SD_BUS_CREDS_CMDLINE) + m |= KDBUS_ATTACH_CMDLINE; + + 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)) + m |= KDBUS_ATTACH_CGROUP; + + if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) + m |= KDBUS_ATTACH_CAPS; + + if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) + m |= KDBUS_ATTACH_SECLABEL; + + if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) + m |= KDBUS_ATTACH_AUDIT; + + if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) + m |= KDBUS_ATTACH_NAMES; + + *kdbus_mask = m; return 0; } + +int bus_kernel_create_bus(const char *name, char **s) { + struct kdbus_cmd_make *make; + struct kdbus_item *n; + int fd; + + assert(name); + assert(s); + + fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) + return -errno; + + make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + + offsetof(struct kdbus_item, data64) + sizeof(uint64_t) + + offsetof(struct kdbus_item, str) + + DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1)); + + make->size = offsetof(struct kdbus_cmd_make, items); + + n = make->items; + n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); + n->type = KDBUS_ITEM_BLOOM_SIZE; + n->data64[0] = BLOOM_SIZE; + assert_cc(BLOOM_SIZE % 8 == 0); + make->size += ALIGN8(n->size); + + n = KDBUS_ITEM_NEXT(n); + sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name); + n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; + n->type = KDBUS_ITEM_MAKE_NAME; + make->size += ALIGN8(n->size); + + make->flags = KDBUS_MAKE_POLICY_OPEN; + + if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { + close_nointr_nofail(fd); + return -errno; + } + + /* The higher 32bit of the flags field are considered + * 'incompatible flags'. Refuse them all for now. */ + if (make->flags > 0xFFFFFFFFULL) { + close_nointr_nofail(fd); + return -ENOTSUP; + } + + if (s) { + char *p; + + p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); + if (!p) { + close_nointr_nofail(fd); + return -ENOMEM; + } + + *s = p; + } + + return fd; +} + +int bus_kernel_create_starter(const char *bus, const char *name) { + struct kdbus_cmd_hello *hello; + struct kdbus_item *n; + char *p; + int fd; + + assert(bus); + assert(name); + + p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); + sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); + + fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) + return -errno; + + hello = alloca0(ALIGN8(offsetof(struct kdbus_cmd_hello, items) + + offsetof(struct kdbus_item, str) + + strlen(name) + 1)); + + n = hello->items; + strcpy(n->str, name); + n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; + n->type = KDBUS_ITEM_NAME; + + hello->size = ALIGN8(offsetof(struct kdbus_cmd_hello, items) + n->size); + hello->conn_flags = KDBUS_HELLO_ACTIVATOR; + hello->pool_size = KDBUS_POOL_SIZE; + + if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { + close_nointr_nofail(fd); + return -errno; + } + + /* The higher 32bit of both flags fields are considered + * 'incompatible flags'. Refuse them all for now. */ + if (hello->bus_flags > 0xFFFFFFFFULL || + hello->conn_flags > 0xFFFFFFFFULL) { + close_nointr_nofail(fd); + return -ENOTSUP; + } + + if (hello->bloom_size != BLOOM_SIZE) { + close_nointr_nofail(fd); + return -ENOTSUP; + } + + return fd; +} + +int bus_kernel_create_namespace(const char *name, char **s) { + struct kdbus_cmd_make *make; + struct kdbus_item *n; + int fd; + + assert(name); + assert(s); + + fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) + return -errno; + + make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + + offsetof(struct kdbus_item, str) + + strlen(name) + 1)); + + n = make->items; + strcpy(n->str, name); + n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; + n->type = KDBUS_ITEM_MAKE_NAME; + + make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); + make->flags = KDBUS_MAKE_POLICY_OPEN | KDBUS_MAKE_ACCESS_WORLD; + + if (ioctl(fd, KDBUS_CMD_NS_MAKE, make) < 0) { + close_nointr_nofail(fd); + return -errno; + } + + /* The higher 32bit of the flags field are considered + * 'incompatible flags'. Refuse them all for now. */ + if (make->flags > 0xFFFFFFFFULL) { + close_nointr_nofail(fd); + return -ENOTSUP; + } + + if (s) { + char *p; + + p = strappend("/dev/kdbus/ns/", name); + if (!p) { + close_nointr_nofail(fd); + return -ENOMEM; + } + + *s = p; + } + + return fd; +} + +int bus_kernel_create_monitor(const char *bus) { + struct kdbus_cmd_hello *hello; + char *p; + int fd; + + assert(bus); + + p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); + sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); + + fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) + return -errno; + + hello = alloca0(sizeof(struct kdbus_cmd_hello)); + hello->size = sizeof(struct kdbus_cmd_hello); + hello->conn_flags = KDBUS_HELLO_ACTIVATOR; + hello->pool_size = KDBUS_POOL_SIZE; + + if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { + close_nointr_nofail(fd); + return -errno; + } + + /* The higher 32bit of both flags fields are considered + * 'incompatible flags'. Refuse them all for now. */ + if (hello->bus_flags > 0xFFFFFFFFULL || + hello->conn_flags > 0xFFFFFFFFULL) { + close_nointr_nofail(fd); + return -ENOTSUP; + } + + return fd; +}