#include <sys/mman.h>
#include "util.h"
+#include "strv.h"
#include "bus-internal.h"
#include "bus-message.h"
#include "bus-kernel.h"
#include "bus-bloom.h"
+#include "bus-util.h"
-#define KDBUS_ITEM_NEXT(item) \
- (typeof(item))(((uint8_t *)item) + ALIGN8((item)->size))
+#define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
-#define KDBUS_ITEM_FOREACH(item, head) \
- for (item = (head)->items; \
- (uint8_t *)(item) < (uint8_t *)(head) + (head)->size; \
- item = KDBUS_ITEM_NEXT(item))
-
-#define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
-#define KDBUS_ITEM_SIZE(s) ALIGN8((s) + KDBUS_ITEM_HEADER_SIZE)
-
-#define KDBUS_BUFFER_SIZE (4*1024*1024)
-
-static int parse_unique_name(const char *s, uint64_t *id) {
+int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
int r;
assert(s);
static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
assert(d);
- assert(p);
assert(sz > 0);
*d = ALIGN8_PTR(*d);
+ /* Note that p can be NULL, which encodes a region full of
+ * zeroes, which is useful to optimize certain padding
+ * conditions */
+
(*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
- (*d)->type = KDBUS_MSG_PAYLOAD_VEC;
- (*d)->vec.address = (intptr_t) p;
+ (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
+ (*d)->vec.address = PTR_TO_UINT64(p);
(*d)->vec.size = sz;
*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
}
+static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) {
+ assert(d);
+ assert(memfd >= 0);
+ assert(sz > 0);
+
+ *d = ALIGN8_PTR(*d);
+ (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
+ (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
+ (*d)->memfd.fd = memfd;
+ (*d)->memfd.size = sz;
+
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
+}
+
static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
assert(d);
assert(s);
*d = ALIGN8_PTR(*d);
(*d)->size = offsetof(struct kdbus_item, str) + length + 1;
- (*d)->type = KDBUS_MSG_DST_NAME;
+ (*d)->type = KDBUS_ITEM_DST_NAME;
memcpy((*d)->str, s, length + 1);
*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
*d = ALIGN8_PTR(*d);
(*d)->size = offsetof(struct kdbus_item, data) + length;
- (*d)->type = KDBUS_MSG_BLOOM;
+ (*d)->type = KDBUS_ITEM_BLOOM;
r = (*d)->data;
*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
*d = ALIGN8_PTR(*d);
(*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
- (*d)->type = KDBUS_MSG_FDS;
+ (*d)->type = KDBUS_ITEM_FDS;
memcpy((*d)->fds, fds, sizeof(int) * n_fds);
*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
bloom_add_pair(bloom, "member", m->member);
if (m->path) {
bloom_add_pair(bloom, "path", m->path);
+ bloom_add_pair(bloom, "path-slash-prefix", m->path);
bloom_add_prefixes(bloom, "path-slash-prefix", m->path, '/');
}
}
static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
+ struct bus_body_part *part;
struct kdbus_item *d;
bool well_known;
uint64_t unique;
size_t sz, dl;
+ unsigned i;
int r;
assert(b);
return 0;
if (m->destination) {
- r = parse_unique_name(m->destination, &unique);
+ r = bus_kernel_parse_unique_name(m->destination, &unique);
if (r < 0)
return r;
sz = offsetof(struct kdbus_msg, items);
+ assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) ==
+ ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd)));
+
/* Add in fixed header, fields header and payload */
- sz += 3 * ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
+ sz += (1 + m->n_body_parts) *
+ ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec));
/* Add space for bloom filter */
sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE);
sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
m->kdbus = memalign(8, sz);
- if (!m->kdbus)
- return -ENOMEM;
+ if (!m->kdbus) {
+ r = -ENOMEM;
+ goto fail;
+ }
+ m->free_kdbus = true;
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;
if (well_known)
append_destination(&d, m->destination, dl);
- append_payload_vec(&d, m->header, sizeof(*m->header));
+ append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
- if (m->fields)
- append_payload_vec(&d, m->fields, ALIGN8(m->header->fields_size));
+ MESSAGE_FOREACH_PART(part, i, m) {
+ if (part->is_zero) {
+ /* If this is padding then simply send a
+ * vector with a NULL data pointer which the
+ * kernel will just pass through. This is the
+ * most efficient way to encode zeroes */
+
+ append_payload_vec(&d, NULL, part->size);
+ continue;
+ }
- if (m->body)
- append_payload_vec(&d, m->body, m->header->body_size);
+ if (part->memfd >= 0 && part->sealed && m->destination) {
+ /* Try to send a memfd, if the part is
+ * sealed and this is not a broadcast. Since we can only */
+
+ append_payload_memfd(&d, part->memfd, part->size);
+ continue;
+ }
+
+ /* Otherwise let's send a vector to the actual data,
+ * for that we need to map it first. */
+ r = bus_body_part_map(part);
+ if (r < 0)
+ goto fail;
+
+ append_payload_vec(&d, part->data, part->size);
+ }
if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
void *p;
p = append_bloom(&d, BLOOM_SIZE);
r = bus_message_setup_bloom(m, p);
- if (r < 0) {
- free(m->kdbus);
- m->kdbus = NULL;
- return -r;
- }
+ if (r < 0)
+ goto fail;
}
if (m->n_fds > 0)
m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
assert(m->kdbus->size <= sz);
- m->free_kdbus = true;
-
return 0;
+
+fail:
+ m->poisoned = true;
+ return r;
}
int bus_kernel_take_fd(sd_bus *b) {
- uint8_t h[ALIGN8(sizeof(struct kdbus_cmd_hello)) +
- ALIGN8(KDBUS_ITEM_HEADER_SIZE) +
- ALIGN8(sizeof(struct kdbus_vec))] = {};
-
- struct kdbus_cmd_hello *hello = (struct kdbus_cmd_hello*) h;
-
+ struct kdbus_cmd_hello *hello;
+ struct kdbus_item *item;
+ size_t l, sz;
int r;
assert(b);
if (b->is_server)
return -EINVAL;
- if (!b->kdbus_buffer) {
- b->kdbus_buffer = mmap(NULL, KDBUS_BUFFER_SIZE, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
- if (b->kdbus_buffer == MAP_FAILED) {
- b->kdbus_buffer = NULL;
- return -errno;
- }
+ b->use_memfd = 1;
+
+ sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items));
+
+ if (b->fake_creds_valid)
+ sz += ALIGN8(offsetof(struct kdbus_item, creds));
+
+ if (b->fake_label) {
+ l = strlen(b->fake_label);
+ sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
}
- hello->size = sizeof(h);
- hello->conn_flags =
- KDBUS_HELLO_ACCEPT_FD|
- KDBUS_HELLO_ATTACH_COMM|
- KDBUS_HELLO_ATTACH_EXE|
- KDBUS_HELLO_ATTACH_CMDLINE|
- KDBUS_HELLO_ATTACH_CGROUP|
- KDBUS_HELLO_ATTACH_CAPS|
- KDBUS_HELLO_ATTACH_SECLABEL|
- KDBUS_HELLO_ATTACH_AUDIT;
+ hello = alloca0(sz);
+ hello->size = sz;
+ hello->conn_flags = b->hello_flags;
+ hello->attach_flags = b->attach_flags;
+ hello->pool_size = KDBUS_POOL_SIZE;
+
+ item = hello->items;
+
+ if (b->fake_creds_valid) {
+ item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
+ item->type = KDBUS_ITEM_CREDS;
+ item->creds = b->fake_creds;
- hello->items[0].type = KDBUS_HELLO_BUFFER;
- hello->items[0].size = KDBUS_ITEM_HEADER_SIZE + sizeof(struct kdbus_vec);
- hello->items[0].vec.address = (uint64_t) b->kdbus_buffer;
- hello->items[0].vec.size = KDBUS_BUFFER_SIZE;
+ item = KDBUS_ITEM_NEXT(item);
+ }
+
+ if (b->fake_label) {
+ item->size = offsetof(struct kdbus_item, str) + l + 1;
+ memcpy(item->str, b->fake_label, l+1);
+ }
r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
if (r < 0)
return -errno;
+ if (!b->kdbus_buffer) {
+ b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
+ if (b->kdbus_buffer == MAP_FAILED) {
+ b->kdbus_buffer = NULL;
+ return -errno;
+ }
+ }
+
/* The higher 32bit of both flags fields are considered
* 'incompatible flags'. Refuse them all for now. */
if (hello->bus_flags > 0xFFFFFFFFULL ||
if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0)
return -ENOMEM;
+ b->unique_id = hello->id;
+
b->is_kernel = true;
b->bus_client = true;
- b->can_fds = true;
+ b->can_fds = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD);
+ b->message_version = 2;
+ b->message_endian = BUS_NATIVE_ENDIAN;
- r = bus_start_running(b);
- if (r < 0)
- return r;
+ /* the kernel told us the UUID of the underlying bus */
+ memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
- return 1;
+ return bus_start_running(b);
}
int bus_kernel_connect(sd_bus *b) {
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;
}
static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
+ uint64_t off;
struct kdbus_item *d;
assert(bus);
assert(k);
- ioctl(bus->input_fd, KDBUS_CMD_MSG_RELEASE, k);
-
- KDBUS_ITEM_FOREACH(d, k) {
+ off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
+ ioctl(bus->input_fd, KDBUS_CMD_FREE, &off);
- if (d->type != KDBUS_MSG_FDS)
- continue;
+ KDBUS_ITEM_FOREACH(d, k, items) {
- close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
+ if (d->type == KDBUS_ITEM_FDS)
+ close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
+ else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
+ close_nointr_nofail(d->memfd.fd);
}
}
-static bool range_contains(size_t astart, size_t asize, size_t bstart, size_t bsize, void *a, void **b) {
+static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) {
+ _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",
+ "NameOwnerChanged",
+ &m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
+ if (r < 0)
+ return r;
+
+ m->sender = "org.freedesktop.DBus";
+
+ r = bus_seal_synthetic_message(bus, m);
+ if (r < 0)
+ return r;
+
+ bus->rqueue[bus->rqueue_size++] = m;
+ 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];
+
+ assert(bus);
+ assert(k);
+ assert(d);
+
+ 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);
+
+ 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;
+
+ new_owner[0] = 0;
+ } 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);
+}
- if (bstart < astart)
- return false;
+static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
+ char owner[UNIQUE_NAME_MAX];
- if (bstart + bsize > astart + asize)
- return false;
+ assert(bus);
+ assert(k);
+ assert(d);
- *b = (uint8_t*) a + (bstart - astart);
+ sprintf(owner, ":1.%llu", d->id_change.id);
- return true;
+ return push_name_owner_changed(
+ bus, owner,
+ d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
+ d->type == KDBUS_ITEM_ID_ADD ? owner : NULL);
}
-static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_message **ret) {
+static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ int r;
+
+ assert(bus);
+ assert(k);
+ assert(d);
+
+ r = bus_message_new_synthetic_error(
+ bus,
+ k->cookie_reply,
+ d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
+ &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
+ &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
+ &m);
+ if (r < 0)
+ return r;
+
+ m->sender = "org.freedesktop.DBus";
+
+ r = bus_seal_synthetic_message(bus, m);
+ if (r < 0)
+ return r;
+
+ bus->rqueue[bus->rqueue_size++] = m;
+ m = NULL;
+
+ return 1;
+}
+
+static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
+ struct kdbus_item *d, *found = NULL;
+
+ static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = {
+ [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
+ [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
+ [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
+
+ [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
+ [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
+
+ [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
+ [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
+ };
+
+ assert(bus);
+ assert(k);
+ assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
+
+ 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;
+ found = d;
+ } else
+ log_debug("Got unknown field from kernel %llu", d->type);
+ }
+
+ if (!found) {
+ log_debug("Didn't find a kernel message to translate.");
+ return 0;
+ }
+
+ return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found);
+}
+
+static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
sd_bus_message *m = NULL;
struct kdbus_item *d;
- unsigned n_payload = 0, n_fds = 0;
+ unsigned n_fds = 0;
_cleanup_free_ int *fds = NULL;
struct bus_header *h = NULL;
size_t total, n_bytes = 0, idx = 0;
assert(bus);
assert(k);
- assert(ret);
-
- if (k->payload_type != KDBUS_PAYLOAD_DBUS1)
- return 0;
+ assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
- KDBUS_ITEM_FOREACH(d, k) {
+ KDBUS_ITEM_FOREACH(d, k, items) {
size_t l;
l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
+ switch (d->type) {
+ case KDBUS_ITEM_PAYLOAD_OFF:
if (!h) {
- if (d->vec.size < sizeof(struct bus_header))
- return -EBADMSG;
+ h = (struct bus_header *)((uint8_t *)k + d->vec.offset);
- h = (struct bus_header*) d->vec.address;
+ if (!bus_header_is_complete(h, d->vec.size))
+ return -EBADMSG;
}
- n_payload++;
n_bytes += d->vec.size;
+ break;
+
+ case KDBUS_ITEM_PAYLOAD_MEMFD:
+ if (!h)
+ return -EBADMSG;
- } else if (d->type == KDBUS_MSG_FDS) {
+ n_bytes += d->memfd.size;
+ break;
+
+ case KDBUS_ITEM_FDS: {
int *f;
unsigned j;
fds = f;
memcpy(fds + n_fds, d->fds, sizeof(int) * j);
n_fds += j;
+ break;
+ }
- } else if (d->type == KDBUS_MSG_DST_NAME)
- destination = d->str;
- else if (d->type == KDBUS_MSG_SRC_SECLABEL)
+ case KDBUS_ITEM_SECLABEL:
seclabel = d->str;
+ break;
+ }
}
if (!h)
return -EBADMSG;
- r = bus_header_size(h, &total);
+ r = bus_header_message_size(h, &total);
if (r < 0)
return r;
if (n_bytes != total)
return -EBADMSG;
- if (n_payload > 2)
- 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(h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
+ r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
if (r < 0)
return r;
- KDBUS_ITEM_FOREACH(d, k) {
+ /* The well-known names list is different from the other
+ credentials. If we asked for it, but nothing is there, this
+ means that the list of well-known names is simply empty, not
+ that we lack any data */
+
+ m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
+
+ KDBUS_ITEM_FOREACH(d, k, items) {
size_t l;
l = d->size - offsetof(struct kdbus_item, data);
- if (d->type == KDBUS_MSG_PAYLOAD_VEC) {
+ switch (d->type) {
+
+ case KDBUS_ITEM_PAYLOAD_OFF: {
+ size_t begin_body;
+
+ begin_body = BUS_MESSAGE_BODY_BEGIN(m);
+
+ if (idx + d->vec.size > begin_body) {
+ struct bus_body_part *part;
+
+ /* Contains body material */
+
+ part = message_append_part(m);
+ if (!part) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ /* A -1 offset is NUL padding. */
+ part->is_zero = d->vec.offset == ~0ULL;
- range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)), BUS_MESSAGE_FIELDS_SIZE(m), (void*) d->vec.address, &m->fields);
- range_contains(idx, d->vec.size, ALIGN8(sizeof(struct bus_header)) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)), BUS_MESSAGE_BODY_SIZE(m), (void*) d->vec.address, &m->body);
+ if (idx >= begin_body) {
+ if (!part->is_zero)
+ part->data = (uint8_t *)k + d->vec.offset;
+ part->size = d->vec.size;
+ } else {
+ if (!part->is_zero)
+ part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx);
+ part->size = d->vec.size - (begin_body - idx);
+ }
+
+ part->sealed = true;
+ }
idx += d->vec.size;
+ break;
+ }
+
+ case KDBUS_ITEM_PAYLOAD_MEMFD: {
+ struct bus_body_part *part;
- } else if (d->type == KDBUS_MSG_SRC_CREDS) {
- m->pid_starttime = d->creds.starttime / NSEC_PER_USEC;
- m->uid = d->creds.uid;
- m->gid = d->creds.gid;
- m->pid = d->creds.pid;
- m->tid = d->creds.tid;
- m->uid_valid = m->gid_valid = true;
- } else if (d->type == KDBUS_MSG_TIMESTAMP) {
+ if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ part = message_append_part(m);
+ if (!part) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ part->memfd = d->memfd.fd;
+ part->size = d->memfd.size;
+ part->sealed = true;
+
+ idx += d->memfd.size;
+ break;
+ }
+
+ case KDBUS_ITEM_CREDS:
+ m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC;
+ m->creds.uid = d->creds.uid;
+ m->creds.gid = d->creds.gid;
+ m->creds.pid = d->creds.pid;
+ m->creds.tid = d->creds.tid;
+ 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;
+ break;
+
+ case KDBUS_ITEM_TIMESTAMP:
m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC;
m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC;
- } else if (d->type == KDBUS_MSG_SRC_PID_COMM)
- m->comm = d->str;
- else if (d->type == KDBUS_MSG_SRC_TID_COMM)
- m->tid_comm = d->str;
- else if (d->type == KDBUS_MSG_SRC_EXE)
- m->exe = d->str;
- else if (d->type == KDBUS_MSG_SRC_CMDLINE) {
- m->cmdline = d->str;
- m->cmdline_length = l;
- } else if (d->type == KDBUS_MSG_SRC_CGROUP)
- m->cgroup = d->str;
- else if (d->type == KDBUS_MSG_SRC_AUDIT)
- m->audit = &d->audit;
- else if (d->type == KDBUS_MSG_SRC_CAPS) {
- m->capability = d->data;
- m->capability_size = l;
- } else if (d->type != KDBUS_MSG_FDS &&
- d->type != KDBUS_MSG_DST_NAME &&
- d->type != KDBUS_MSG_SRC_SECLABEL)
- log_debug("Got unknown field from kernel %llu", d->type);
- }
+ break;
- if ((BUS_MESSAGE_FIELDS_SIZE(m) > 0 && !m->fields) ||
- (BUS_MESSAGE_BODY_SIZE(m) > 0 && !m->body)) {
- sd_bus_message_unref(m);
- return -EBADMSG;
+ case KDBUS_ITEM_PID_COMM:
+ m->creds.comm = d->str;
+ m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_TID_COMM:
+ m->creds.tid_comm = d->str;
+ m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_EXE:
+ m->creds.exe = d->str;
+ m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_CMDLINE:
+ m->creds.cmdline = d->str;
+ m->creds.cmdline_size = l;
+ m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_CGROUP:
+ m->creds.cgroup = d->str;
+ 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;
+ break;
+
+ case KDBUS_ITEM_AUDIT:
+ m->creds.audit_session_id = d->audit.sessionid;
+ m->creds.audit_login_uid = d->audit.loginuid;
+ m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_CAPS:
+ m->creds.capability = d->data;
+ m->creds.capability_size = l;
+ 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;
+ break;
+
+ case KDBUS_ITEM_DST_NAME:
+ destination = d->str;
+ break;
+
+ case KDBUS_ITEM_NAME:
+ r = strv_extend(&m->creds.well_known_names, d->name.name);
+ if (r < 0)
+ goto fail;
+ break;
+
+ case KDBUS_ITEM_FDS:
+ case KDBUS_ITEM_SECLABEL:
+ break;
+
+ default:
+ log_debug("Got unknown field from kernel %llu", d->type);
+ }
}
r = bus_message_parse_fields(m);
- if (r < 0) {
- sd_bus_message_unref(m);
- return r;
- }
+ 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";
+ m->sender = m->creds.unique_name = (char*) "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;
}
- if (!m->destination) {
- if (destination)
- m->destination = destination;
- else if (k->dst_id != KDBUS_DST_ID_WELL_KNOWN_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;
- }
+ if (destination)
+ m->destination = destination;
+ else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
+ m->destination = NULL;
+ else if (k->dst_id == KDBUS_DST_ID_NAME)
+ m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
+ else {
+ snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id);
+ m->destination = m->destination_buffer;
}
/* We take possession of the kmsg struct now */
m->kdbus = k;
- m->bus = sd_bus_ref(bus);
m->release_kdbus = true;
m->free_fds = true;
-
fds = NULL;
- *ret = m;
+ bus->rqueue[bus->rqueue_size++] = m;
+
return 1;
+
+fail:
+ if (m) {
+ struct bus_body_part *part;
+ unsigned i;
+
+ /* Make sure the memfds are not freed twice */
+ MESSAGE_FOREACH_PART(part, i, m)
+ if (part->memfd >= 0)
+ part->memfd = -1;
+
+ sd_bus_message_unref(m);
+ }
+
+ return r;
}
-int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m) {
+int bus_kernel_read_message(sd_bus *bus) {
struct kdbus_msg *k;
+ uint64_t off;
int r;
assert(bus);
- assert(m);
- r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &k);
+ r = bus_rqueue_make_room(bus);
+ if (r < 0)
+ return r;
+
+ r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &off);
if (r < 0) {
if (errno == EAGAIN)
return 0;
return -errno;
}
+ k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off);
+ if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
+ r = bus_kernel_make_message(bus, k);
-/* /\* Let's tell valgrind that there's really no need to */
-/* * initialize this fully. This should be removed again */
-/* * when valgrind learned the kdbus ioctls natively. *\/ */
-/* #ifdef HAVE_VALGRIND_MEMCHECK_H */
-/* VALGRIND_MAKE_MEM_DEFINED(k, sz); */
-/* #endif */
+ /* 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;
- r = bus_kernel_make_message(bus, k, m);
if (r <= 0)
close_kdbus_msg(bus, k);
return r < 0 ? r : 1;
}
-int bus_kernel_create(const char *name, char **s) {
- struct kdbus_cmd_bus_make *make;
- struct kdbus_item *n, *cg;
- size_t l;
+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(mapped);
+ assert(allocated);
+
+ if (!bus || !bus->is_kernel)
+ return -ENOTSUP;
+
+ assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
+
+ if (bus->n_memfd_cache <= 0) {
+ int r;
+
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
+
+ r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &fd);
+ if (r < 0)
+ return -errno;
+
+ *address = NULL;
+ *mapped = 0;
+ *allocated = 0;
+ return fd;
+ }
+
+ c = &bus->memfd_cache[--bus->n_memfd_cache];
+
+ assert(c->fd >= 0);
+ assert(c->mapped == 0 || c->address);
+
+ *address = c->address;
+ *mapped = c->mapped;
+ *allocated = c->allocated;
+ fd = c->fd;
+
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
+
+ return fd;
+}
+
+static void close_and_munmap(int fd, void *address, size_t size) {
+ if (size > 0)
+ assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
+
+ close_nointr_nofail(fd);
+}
+
+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_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
+
+ assert(fd >= 0);
+ assert(mapped == 0 || address);
+
+ if (!bus || !bus->is_kernel) {
+ close_and_munmap(fd, address, mapped);
+ return;
+ }
+
+ assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0);
+
+ if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0);
+
+ close_and_munmap(fd, address, mapped);
+ return;
+ }
+
+ c = &bus->memfd_cache[bus->n_memfd_cache++];
+ c->fd = fd;
+ c->address = address;
+
+ /* If overly long, let's return a bit to the OS */
+ 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);
+}
+
+void bus_kernel_flush_memfd(sd_bus *b) {
+ unsigned i;
+
+ 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].mapped);
+}
+
+int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) {
+ uint64_t f = 0;
+
+ assert(kdbus_flags);
+
+ if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
+ f |= KDBUS_NAME_ALLOW_REPLACEMENT;
+
+ if (flags & SD_BUS_NAME_REPLACE_EXISTING)
+ f |= KDBUS_NAME_REPLACE_EXISTING;
+
+ if (flags & SD_BUS_NAME_QUEUE)
+ f |= 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;
- char *p;
assert(name);
assert(s);
if (fd < 0)
return -errno;
- l = strlen(name);
- make = alloca0(offsetof(struct kdbus_cmd_bus_make, items) +
- KDBUS_ITEM_HEADER_SIZE + sizeof(uint64_t) +
- KDBUS_ITEM_HEADER_SIZE + DECIMAL_STR_MAX(uid_t) + 1 + l + 1);
-
- cg = make->items;
- cg->type = KDBUS_MAKE_CGROUP;
- cg->data64[0] = 1;
- cg->size = KDBUS_ITEM_HEADER_SIZE + sizeof(uint64_t);
+ 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));
- n = KDBUS_ITEM_NEXT(cg);
- n->type = KDBUS_MAKE_NAME;
- sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name);
- n->size = KDBUS_ITEM_HEADER_SIZE + strlen(n->str) + 1;
+ make->size = offsetof(struct kdbus_cmd_make, items);
- make->size = offsetof(struct kdbus_cmd_bus_make, items) + cg->size + n->size;
- make->flags = KDBUS_MAKE_ACCESS_WORLD | KDBUS_MAKE_POLICY_OPEN;
- make->bus_flags = 0;
- make->bloom_size = BLOOM_SIZE;
+ 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);
- p = strjoin("/dev/kdbus/", n->str, "/bus", NULL);
- if (!p)
- return -ENOMEM;
+ 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);
- free(p);
return -errno;
}
- if (s)
+ /* 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;
+}
+
+int bus_kernel_try_close(sd_bus *bus) {
+ assert(bus);
+ assert(bus->is_kernel);
+
+ if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0)
+ return -errno;
+
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff