#ifdef HAVE_VALGRIND_MEMCHECK_H

#include <valgrind/memcheck.h>

#endif

#include <fcntl.h>

#include <malloc.h>

#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"

#include "cgroup-util.h"

#define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))

int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {

int r;

assert(s);

assert(id);

if (!startswith(s, ":1."))

return 0;

r = safe_atou64(s + 3, id);

if (r < 0)

return r;

return 1;

}

static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {

assert(d);

assert(sz > 0);

*d = ALIGN8_PTR(*d);

/* Note that p can be NULL, which encodes a region full of

(*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);

(*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_ITEM_DST_NAME;

memcpy((*d)->str, s, length + 1);

*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);

}

static void* append_bloom(struct kdbus_item **d, size_t length) {

void *r;

assert(d);

*d = ALIGN8_PTR(*d);

(*d)->size = offsetof(struct kdbus_item, data) + length;

(*d)->type = KDBUS_ITEM_BLOOM;

r = (*d)->data;

*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);

return r;

}

static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {

assert(d);

assert(fds);

assert(n_fds > 0);

*d = ALIGN8_PTR(*d);

(*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;

(*d)->type = KDBUS_ITEM_FDS;

memcpy((*d)->fds, fds, sizeof(int) * n_fds);

*d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);

}

static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) {

unsigned i;

int r;

assert(m);

assert(bloom);

memset(bloom, 0, BLOOM_SIZE);

bloom_add_pair(bloom, "message-type", bus_message_type_to_string(m->header->type));

if (m->interface)

bloom_add_pair(bloom, "interface", m->interface);

if (m->member)

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, '/');

}

r = sd_bus_message_rewind(m, true);

if (r < 0)

return r;

for (i = 0; i < 64; i++) {

char type;

const char *t;

char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];

char *e;

r = sd_bus_message_peek_type(m, &type, NULL);

if (r < 0)

return r;

if (type != SD_BUS_TYPE_STRING &&

type != SD_BUS_TYPE_OBJECT_PATH &&

type != SD_BUS_TYPE_SIGNATURE)

break;

r = sd_bus_message_read_basic(m, type, &t);

if (r < 0)

return r;

e = stpcpy(buf, "arg");

if (i < 10)

*(e++) = '0' + (char) i;

else {

*(e++) = '0' + (char) (i / 10);

*(e++) = '0' + (char) (i % 10);

}

*e = 0;

bloom_add_pair(bloom, buf, t);

strcpy(e, "-dot-prefix");

bloom_add_prefixes(bloom, buf, t, '.');

strcpy(e, "-slash-prefix");

bloom_add_prefixes(bloom, buf, t, '/');

}

return 0;

}

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);

assert(m);

assert(m->sealed);

if (m->kdbus)

return 0;

if (m->destination) {

r = bus_kernel_parse_unique_name(m->destination, &unique);

if (r < 0)

return r;

well_known = r == 0;

} else

well_known = false;

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 += (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);

/* Add in well-known destination header */

if (well_known) {

dl = strlen(m->destination);

sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);

}

/* Add space for unix fds */

if (m->n_fds > 0)

sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);

m->kdbus = memalign(8, sz);

if (!m->kdbus) {

r = -ENOMEM;

goto fail;

}

m->free_kdbus = true;

memset(m->kdbus, 0, sz);

m->kdbus->flags =

((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_DBUS;

m->kdbus->cookie = m->header->serial;

if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)

m->kdbus->cookie_reply = m->reply_cookie;

else

m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC;

d = m->kdbus->items;

if (well_known)

append_destination(&d, m->destination, dl);

append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));

MESSAGE_FOREACH_PART(part, i, m) {

if (part->is_zero) {

/* If this is padding then simply send a

append_payload_vec(&d, NULL, part->size);

continue;

}

if (part->memfd >= 0 && part->sealed && m->destination) {

/* Try to send a memfd, if the part is

append_payload_memfd(&d, part->memfd, part->size);

continue;

}

/* Otherwise let's send a vector to the actual data,

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)

goto fail;

}

if (m->n_fds > 0)

append_fds(&d, m->fds, m->n_fds);

m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;

assert(m->kdbus->size <= sz);

return 0;

fail:

m->poisoned = true;

return r;

}

int bus_kernel_take_fd(sd_bus *b) {

struct kdbus_cmd_hello *hello;

struct kdbus_item *item;

size_t l = 0, sz;

int r;

assert(b);

if (b->is_server)

return -EINVAL;

b->use_memfd = 1;

sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items));

if (b->fake_creds_valid)

sz += ALIGN8(offsetof(struct kdbus_item, creds)) + sizeof(struct kdbus_creds);

if (b->fake_label) {

l = strlen(b->fake_label);

sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);

}

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;

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

if (hello->bus_flags > 0xFFFFFFFFULL ||

hello->conn_flags > 0xFFFFFFFFULL)

return -ENOTSUP;

if (hello->bloom_size != BLOOM_SIZE)

return -ENOTSUP;

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 = !!(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));

return bus_start_running(b);

}

int bus_kernel_connect(sd_bus *b) {

assert(b);

assert(b->input_fd < 0);

assert(b->output_fd < 0);

assert(b->kernel);

if (b->is_server)

return -EINVAL;

b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);

if (b->input_fd < 0)

return -errno;

b->output_fd = b->input_fd;

return bus_kernel_take_fd(b);

}

int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) {

int r;

assert(bus);

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) {

_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

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_COOKIE(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);

off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;

ioctl(bus->input_fd, KDBUS_CMD_FREE, &off);

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));

else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)

close_nointr_nofail(d->memfd.fd);

}

}

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);

}

static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) {

char owner[UNIQUE_NAME_MAX];

assert(bus);

assert(k);

assert(d);

sprintf(owner, ":1.%llu", d->id_change.id);

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 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_fds = 0;

_cleanup_free_ int *fds = NULL;

struct bus_header *h = NULL;

size_t total, n_bytes = 0, idx = 0;

const char *destination = NULL, *seclabel = NULL;

int r;

assert(bus);

assert(k);

assert(k->payload_type == KDBUS_PAYLOAD_DBUS);

KDBUS_ITEM_FOREACH(d, k, items) {

size_t l;

l = d->size - offsetof(struct kdbus_item, data);

switch (d->type) {

case KDBUS_ITEM_PAYLOAD_OFF:

if (!h) {

h = (struct bus_header *)((uint8_t *)k + d->vec.offset);

if (!bus_header_is_complete(h, d->vec.size))

return -EBADMSG;

}

n_bytes += d->vec.size;

break;

case KDBUS_ITEM_PAYLOAD_MEMFD:

if (!h)

return -EBADMSG;

n_bytes += d->memfd.size;

break;

case KDBUS_ITEM_FDS: {

int *f;

unsigned j;

j = l / sizeof(int);

f = realloc(fds, sizeof(int) * (n_fds + j));

if (!f)

return -ENOMEM;

fds = f;

memcpy(fds + n_fds, d->fds, sizeof(int) * j);

n_fds += j;

break;

}

case KDBUS_ITEM_SECLABEL:

seclabel = d->str;

break;

}

}

if (!h)

return -EBADMSG;

r = bus_header_message_size(h, &total);

if (r < 0)

return r;

if (n_bytes != total)

return -EBADMSG;

/* on kdbus we only speak native endian gvariant, never dbus1

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;

/* The well-known names list is different from the other

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);

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;

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;

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:

/* UID/GID/PID are always valid */

m->creds.uid = (uid_t) d->creds.uid;

m->creds.gid = (gid_t) d->creds.gid;

m->creds.pid = (pid_t) d->creds.pid;

m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask;

/* The PID starttime/TID might be missing

if (d->creds.starttime > 0) {

m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC;

m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask;

}

if (d->creds.tid > 0) {

m->creds.tid = (pid_t) d->creds.tid;

m->creds.mask |= 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;

break;

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;

if (!bus->cgroup_root) {

r = cg_get_root_path(&bus->cgroup_root);

if (r < 0)

goto fail;

}

m->creds.cgroup_root = bus->cgroup_root;

break;

case KDBUS_ITEM_AUDIT:

m->creds.audit_session_id = (uint32_t) d->audit.sessionid;

m->creds.audit_login_uid = (uid_t) 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:

if (!service_name_is_valid(d->str))

return -EBADMSG;

destination = d->str;

break;

case KDBUS_ITEM_NAME:

if (!service_name_is_valid(d->name.name))

return -EBADMSG;

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)

goto fail;

/* Override information from the user header with data from the kernel */

if (k->src_id == KDBUS_SRC_ID_KERNEL)

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->creds.unique_name = m->sender_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->release_kdbus = true;

m->free_fds = true;

fds = NULL;

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) {

struct kdbus_msg *k;

uint64_t off;

int r;

assert(bus);

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);

/* 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;

if (r <= 0)

close_kdbus_msg(bus, k);

return r < 0 ? r : 1;

}

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, bool world, 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 | (world ? KDBUS_MAKE_ACCESS_WORLD : 0);

if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {

close_nointr_nofail(fd);

return -errno;

}

/* The higher 32bit of the flags field are considered

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

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

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

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;

}