579 lines
17 KiB
C
579 lines
17 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2013 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#ifdef HAVE_VALGRIND_MEMCHECK_H
|
|
#include <valgrind/memcheck.h>
|
|
#endif
|
|
|
|
#include <fcntl.h>
|
|
#include <malloc.h>
|
|
|
|
#include "util.h"
|
|
|
|
#include "bus-internal.h"
|
|
#include "bus-message.h"
|
|
#include "bus-kernel.h"
|
|
#include "bus-bloom.h"
|
|
|
|
#define KDBUS_ITEM_NEXT(item) \
|
|
(typeof(item))(((uint8_t *)item) + ALIGN8((item)->size))
|
|
#define KDBUS_ITEM_FOREACH(item, head) \
|
|
for (item = (head)->items; \
|
|
(uint8_t *)(item) < (uint8_t *)(head) + (head)->size; \
|
|
item = KDBUS_ITEM_NEXT(item))
|
|
|
|
static int 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_msg_item **d, const void *p, size_t sz) {
|
|
assert(d);
|
|
assert(p);
|
|
assert(sz > 0);
|
|
|
|
*d = ALIGN8_PTR(*d);
|
|
|
|
(*d)->size = offsetof(struct kdbus_msg_item, vec) + sizeof(struct kdbus_vec);
|
|
(*d)->type = KDBUS_MSG_PAYLOAD_VEC;
|
|
(*d)->vec.address = (uint64_t) p;
|
|
(*d)->vec.size = sz;
|
|
|
|
*d = (struct kdbus_msg_item *) ((uint8_t*) *d + (*d)->size);
|
|
}
|
|
|
|
static void append_destination(struct kdbus_msg_item **d, const char *s, size_t length) {
|
|
assert(d);
|
|
assert(s);
|
|
|
|
*d = ALIGN8_PTR(*d);
|
|
|
|
(*d)->size = offsetof(struct kdbus_msg_item, str) + length + 1;
|
|
(*d)->type = KDBUS_MSG_DST_NAME;
|
|
memcpy((*d)->str, s, length + 1);
|
|
|
|
*d = (struct kdbus_msg_item *) ((uint8_t*) *d + (*d)->size);
|
|
}
|
|
|
|
static void* append_bloom(struct kdbus_msg_item **d, size_t length) {
|
|
void *r;
|
|
|
|
assert(d);
|
|
|
|
*d = ALIGN8_PTR(*d);
|
|
|
|
(*d)->size = offsetof(struct kdbus_msg_item, data) + length;
|
|
(*d)->type = KDBUS_MSG_BLOOM;
|
|
r = (*d)->data;
|
|
|
|
*d = (struct kdbus_msg_item *) ((uint8_t*) *d + (*d)->size);
|
|
|
|
return r;
|
|
}
|
|
|
|
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_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' + i;
|
|
else {
|
|
*(e++) = '0' + (i / 10);
|
|
*(e++) = '0' + (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 kdbus_msg_item *d;
|
|
bool well_known;
|
|
uint64_t unique;
|
|
size_t sz, dl;
|
|
int r;
|
|
|
|
assert(b);
|
|
assert(m);
|
|
assert(m->sealed);
|
|
|
|
if (m->kdbus)
|
|
return 0;
|
|
|
|
if (m->destination) {
|
|
r = 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);
|
|
|
|
/* Add in fixed header, fields header and payload */
|
|
sz += 3 * ALIGN8(offsetof(struct kdbus_msg_item, vec) + sizeof(struct kdbus_vec));
|
|
|
|
/* Add space for bloom filter */
|
|
sz += ALIGN8(offsetof(struct kdbus_msg_item, data) + BLOOM_SIZE);
|
|
|
|
/* Add in well-known destination header */
|
|
if (well_known) {
|
|
dl = strlen(m->destination);
|
|
sz += ALIGN8(offsetof(struct kdbus_msg_item, str) + dl + 1);
|
|
}
|
|
|
|
m->kdbus = memalign(8, sz);
|
|
if (!m->kdbus)
|
|
return -ENOMEM;
|
|
|
|
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->kdbus->dst_id =
|
|
well_known ? 0 :
|
|
m->destination ? unique : KDBUS_DST_ID_BROADCAST;
|
|
m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS1;
|
|
m->kdbus->cookie = m->header->serial;
|
|
|
|
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, sizeof(*m->header));
|
|
|
|
if (m->fields)
|
|
append_payload_vec(&d, m->fields, ALIGN8(m->header->fields_size));
|
|
|
|
if (m->body)
|
|
append_payload_vec(&d, m->body, m->header->body_size);
|
|
|
|
if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) {
|
|
void *p;
|
|
|
|
/* For now, let's add a mask all bloom filter */
|
|
p = append_bloom(&d, BLOOM_SIZE);
|
|
r = bus_message_setup_bloom(m, p);
|
|
if (r < 0) {
|
|
free(m->kdbus);
|
|
m->kdbus = NULL;
|
|
return -r;
|
|
}
|
|
}
|
|
|
|
m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
|
|
assert(m->kdbus->size <= sz);
|
|
|
|
m->free_kdbus = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bus_kernel_take_fd(sd_bus *b) {
|
|
struct kdbus_cmd_hello hello = {
|
|
.conn_flags =
|
|
KDBUS_CMD_HELLO_ACCEPT_FD|
|
|
KDBUS_CMD_HELLO_ACCEPT_MMAP|
|
|
KDBUS_CMD_HELLO_ATTACH_COMM|
|
|
KDBUS_CMD_HELLO_ATTACH_EXE|
|
|
KDBUS_CMD_HELLO_ATTACH_CMDLINE|
|
|
KDBUS_CMD_HELLO_ATTACH_CGROUP|
|
|
KDBUS_CMD_HELLO_ATTACH_CAPS|
|
|
KDBUS_CMD_HELLO_ATTACH_SECLABEL|
|
|
KDBUS_CMD_HELLO_ATTACH_AUDIT
|
|
};
|
|
int r;
|
|
|
|
assert(b);
|
|
|
|
if (b->is_server)
|
|
return -EINVAL;
|
|
|
|
r = ioctl(b->input_fd, KDBUS_CMD_HELLO, &hello);
|
|
if (r < 0)
|
|
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)
|
|
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->is_kernel = true;
|
|
b->bus_client = true;
|
|
|
|
r = bus_start_running(b);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
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);
|
|
|
|
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;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void close_kdbus_msg(struct kdbus_msg *k) {
|
|
struct kdbus_msg_item *d;
|
|
|
|
KDBUS_ITEM_FOREACH(d, k) {
|
|
|
|
if (d->type != KDBUS_MSG_UNIX_FDS)
|
|
continue;
|
|
|
|
close_many(d->fds, (d->size - offsetof(struct kdbus_msg_item, fds)) / sizeof(int));
|
|
}
|
|
}
|
|
|
|
static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_message **ret) {
|
|
sd_bus_message *m = NULL;
|
|
struct kdbus_msg_item *d;
|
|
unsigned n_payload = 0, 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(ret);
|
|
|
|
if (k->payload_type != KDBUS_PAYLOAD_DBUS1)
|
|
return 0;
|
|
|
|
KDBUS_ITEM_FOREACH(d, k) {
|
|
size_t l;
|
|
|
|
l = d->size - offsetof(struct kdbus_msg_item, data);
|
|
|
|
if (d->type == KDBUS_MSG_PAYLOAD) {
|
|
|
|
if (!h) {
|
|
if (l < sizeof(struct bus_header))
|
|
return -EBADMSG;
|
|
|
|
h = (struct bus_header*) d->data;
|
|
}
|
|
|
|
n_payload++;
|
|
n_bytes += l;
|
|
|
|
} else if (d->type == KDBUS_MSG_UNIX_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, j);
|
|
n_fds += j;
|
|
|
|
} else if (d->type == KDBUS_MSG_DST_NAME)
|
|
destination = d->str;
|
|
else if (d->type == KDBUS_MSG_SRC_SECLABEL)
|
|
seclabel = d->str;
|
|
}
|
|
|
|
if (!h)
|
|
return -EBADMSG;
|
|
|
|
r = bus_header_size(h, &total);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (n_bytes != total)
|
|
return -EBADMSG;
|
|
|
|
r = bus_message_from_header(h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
KDBUS_ITEM_FOREACH(d, k) {
|
|
size_t l;
|
|
|
|
l = d->size - offsetof(struct kdbus_msg_item, data);
|
|
|
|
if (d->type == KDBUS_MSG_PAYLOAD) {
|
|
|
|
if (idx == sizeof(struct bus_header) &&
|
|
l == ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)))
|
|
m->fields = d->data;
|
|
else if (idx == sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) &&
|
|
l == BUS_MESSAGE_BODY_SIZE(m))
|
|
m->body = d->data;
|
|
else if (!(idx == 0 && l == sizeof(struct bus_header))) {
|
|
sd_bus_message_unref(m);
|
|
return -EBADMSG;
|
|
}
|
|
|
|
idx += l;
|
|
} 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) {
|
|
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
|
|
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 (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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* We take possession of the kmsg struct now */
|
|
m->kdbus = k;
|
|
m->free_kdbus = true;
|
|
m->free_fds = true;
|
|
|
|
fds = NULL;
|
|
|
|
*ret = m;
|
|
return 1;
|
|
}
|
|
|
|
int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m) {
|
|
struct kdbus_msg *k;
|
|
size_t sz = 1024;
|
|
int r;
|
|
|
|
assert(bus);
|
|
assert(m);
|
|
|
|
for (;;) {
|
|
void *q;
|
|
|
|
q = memalign(8, sz);
|
|
if (!q)
|
|
return -errno;
|
|
|
|
free(bus->rbuffer);
|
|
k = bus->rbuffer = q;
|
|
k->size = sz;
|
|
|
|
/* 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
|
|
|
|
r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, bus->rbuffer);
|
|
if (r >= 0)
|
|
break;
|
|
|
|
if (errno == EAGAIN)
|
|
return 0;
|
|
|
|
if (errno != ENOBUFS)
|
|
return -errno;
|
|
|
|
sz *= 2;
|
|
}
|
|
|
|
r = bus_kernel_make_message(bus, k, m);
|
|
if (r > 0)
|
|
bus->rbuffer = NULL;
|
|
else
|
|
close_kdbus_msg(k);
|
|
|
|
return r < 0 ? r : 1;
|
|
}
|
|
|
|
int bus_kernel_create(const char *name, char **s) {
|
|
struct kdbus_cmd_bus_make *make;
|
|
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, name) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1);
|
|
sprintf(make->name, "%lu-%s", (unsigned long) getuid(), name);
|
|
make->size = offsetof(struct kdbus_cmd_bus_make, name) + strlen(make->name) + 1;
|
|
make->flags = KDBUS_ACCESS_WORLD | KDBUS_POLICY_OPEN;
|
|
make->bus_flags = 0;
|
|
make->bloom_size = BLOOM_SIZE;
|
|
make->cgroup_id = 1;
|
|
assert_cc(BLOOM_SIZE % 8 == 0);
|
|
|
|
p = strjoin("/dev/kdbus/", make->name, "/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;
|
|
}
|