bus-kernel.c revision 6517217d49e59938611b6c00965f44d46a255a1d
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering/***
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering This file is part of systemd.
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering Copyright 2013 Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering systemd is free software; you can redistribute it and/or modify it
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering under the terms of the GNU Lesser General Public License as published by
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering the Free Software Foundation; either version 2.1 of the License, or
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (at your option) any later version.
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering systemd is distributed in the hope that it will be useful, but
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering WITHOUT ANY WARRANTY; without even the implied warranty of
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering Lesser General Public License for more details.
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering You should have received a copy of the GNU Lesser General Public License
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering along with systemd; If not, see <http://www.gnu.org/licenses/>.
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering***/
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#ifdef HAVE_VALGRIND_MEMCHECK_H
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include <valgrind/memcheck.h>
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#endif
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include <fcntl.h>
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include <malloc.h>
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include <sys/mman.h>
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include <sys/prctl.h>
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering/* When we include libgen.h because we need dirname() we immediately
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering * undefine basename() since libgen.h defines it as a macro to the XDG
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering * version which is really broken. */
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include <libgen.h>
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#undef basename
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include "util.h"
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include "strv.h"
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include "memfd-util.h"
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include "capability.h"
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include "fileio.h"
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include "formats-util.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "bus-internal.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "bus-message.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "bus-kernel.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "bus-bloom.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "bus-util.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "bus-label.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringint bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering int r;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(s);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(id);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering if (!startswith(s, ":1."))
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering return 0;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering r = safe_atou64(s + 3, id);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering if (r < 0)
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering return r;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering return 1;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering}
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringstatic void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(sz > 0);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = ALIGN8_PTR(*d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering /* Note that p can be NULL, which encodes a region full of
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering * zeroes, which is useful to optimize certain padding
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering * conditions */
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->vec.address = PTR_TO_UINT64(p);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->vec.size = sz;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering}
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringstatic void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(memfd >= 0);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(sz > 0);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = ALIGN8_PTR(*d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->memfd.fd = memfd;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->memfd.start = start;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->memfd.size = sz;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering}
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringstatic void append_destination(struct kdbus_item **d, const char *s, size_t length) {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(s);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = ALIGN8_PTR(*d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->type = KDBUS_ITEM_DST_NAME;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering memcpy((*d)->str, s, length + 1);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering}
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringstatic struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering struct kdbus_item *i;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering i = ALIGN8_PTR(*d);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering i->size = offsetof(struct kdbus_item, bloom_filter) +
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering offsetof(struct kdbus_bloom_filter, data) +
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering length;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering i->type = KDBUS_ITEM_BLOOM_FILTER;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering return &i->bloom_filter;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering}
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringstatic void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
b577e3d589ec00f6d96e90b0d4bf344dbd40cd76Lennart Poettering assert(d);
b577e3d589ec00f6d96e90b0d4bf344dbd40cd76Lennart Poettering assert(fds);
b577e3d589ec00f6d96e90b0d4bf344dbd40cd76Lennart Poettering assert(n_fds > 0);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
522d85ae0a3dd80ec58033289c4f63ba7dfc63a8Lennart Poettering *d = ALIGN8_PTR(*d);
522d85ae0a3dd80ec58033289c4f63ba7dfc63a8Lennart Poettering (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering (*d)->type = KDBUS_ITEM_FDS;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering memcpy((*d)->fds, fds, sizeof(int) * n_fds);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering}
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringstatic void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering char *e;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(data);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(size > 0);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(i < 64);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(t);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering e = stpcpy(buf, "arg");
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering if (i < 10)
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *(e++) = '0' + (char) i;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering else {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *(e++) = '0' + (char) (i / 10);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *(e++) = '0' + (char) (i % 10);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering }
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering *e = 0;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering bloom_add_pair(data, size, n_hash, buf, t);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering strcpy(e, "-dot-prefix");
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering bloom_add_prefixes(data, size, n_hash, buf, t, '.');
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering strcpy(e, "-slash-prefix");
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering bloom_add_prefixes(data, size, n_hash, buf, t, '/');
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering}
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poetteringstatic int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering void *data;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering unsigned i;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering int r;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(m);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering assert(bloom);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering data = bloom->data;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering memzero(data, m->bus->bloom_size);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering bloom->generation = 0;
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering
9fe4ea21bec739bfe0ebac5565f0539b0e25b317Lennart Poettering bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
9fe4ea21bec739bfe0ebac5565f0539b0e25b317Lennart Poettering
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering if (m->interface)
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering if (m->member)
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
f3e2e81d5385b9ffd84ed110d00eb347ec0e14f1Lennart Poettering if (m->path) {
f3e2e81d5385b9ffd84ed110d00eb347ec0e14f1Lennart Poettering bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
}
r = sd_bus_message_rewind(m, true);
if (r < 0)
return r;
for (i = 0; i < 64; i++) {
const char *t, *contents;
char type;
r = sd_bus_message_peek_type(m, &type, &contents);
if (r < 0)
return r;
if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) {
/* The bloom filter includes simple strings of any kind */
r = sd_bus_message_read_basic(m, type, &t);
if (r < 0)
return r;
add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
} if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) {
/* As well as array of simple strings of any kinds */
r = sd_bus_message_enter_container(m, type, contents);
if (r < 0)
return r;
while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0)
add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
if (r < 0)
return r;
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
} else
/* Stop adding to bloom filter as soon as we
* run into the first argument we cannot add
* to it. */
break;
}
return 0;
}
static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
struct bus_body_part *part;
struct kdbus_item *d;
const char *destination;
bool well_known;
uint64_t unique;
size_t sz, dl;
unsigned i;
int r;
assert(b);
assert(m);
assert(m->sealed);
/* We put this together only once, if this message is reused
* we reuse the earlier-built version */
if (m->kdbus)
return 0;
destination = m->destination ?: m->destination_ptr;
if (destination) {
r = bus_kernel_parse_unique_name(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 += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) +
MAX(sizeof(struct kdbus_vec),
sizeof(struct kdbus_memfd)));
/* Add space for bloom filter */
sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
offsetof(struct kdbus_bloom_filter, data) +
m->bus->bloom_size);
/* Add in well-known destination header */
if (well_known) {
dl = strlen(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;
memzero(m->kdbus, sz);
m->kdbus->flags =
((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) |
((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) |
((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0);
if (well_known)
/* verify_destination_id will usually be 0, which makes the kernel driver only look
* at the provided well-known name. Otherwise, the kernel will make sure the provided
* destination id matches the owner of the provided weel-known-name, and fail if they
* differ. Currently, this is only needed for bus-proxyd. */
m->kdbus->dst_id = m->verify_destination_id;
else
m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST;
m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
m->kdbus->cookie = m->header->dbus2.cookie;
m->kdbus->priority = m->priority;
if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
m->kdbus->cookie_reply = m->reply_cookie;
else {
struct timespec now;
assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0);
m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec +
m->timeout * NSEC_PER_USEC;
}
d = m->kdbus->items;
if (well_known)
append_destination(&d, 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
* 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 (part->memfd >= 0 && part->sealed && 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->memfd_offset, 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->header->type == SD_BUS_MESSAGE_SIGNAL) {
struct kdbus_bloom_filter *bloom;
bloom = append_bloom(&d, m->bus->bloom_size);
r = bus_message_setup_bloom(m, bloom);
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;
}
static void unset_memfds(struct sd_bus_message *m) {
struct bus_body_part *part;
unsigned i;
assert(m);
/* Make sure the memfds are not freed twice */
MESSAGE_FOREACH_PART(part, i, m)
if (part->memfd >= 0)
part->memfd = -1;
}
static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) {
assert(bus);
assert(m);
if (!ts)
return;
if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP))
return;
m->realtime = ts->realtime_ns / NSEC_PER_USEC;
m->monotonic = ts->monotonic_ns / NSEC_PER_USEC;
m->seqnum = ts->seqnum;
}
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 *header = NULL;
void *footer = NULL;
size_t header_size = 0, footer_size = 0;
size_t n_bytes = 0, idx = 0;
const char *destination = NULL, *seclabel = NULL;
bool last_was_memfd = false;
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 (!header) {
header = (struct bus_header*)((uint8_t*) k + d->vec.offset);
header_size = d->vec.size;
}
footer = (uint8_t*) k + d->vec.offset;
footer_size = d->vec.size;
n_bytes += d->vec.size;
last_was_memfd = false;
break;
case KDBUS_ITEM_PAYLOAD_MEMFD:
if (!header) /* memfd cannot be first part */
return -EBADMSG;
n_bytes += d->memfd.size;
last_was_memfd = true;
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 (last_was_memfd) /* memfd cannot be last part */
return -EBADMSG;
if (!header)
return -EBADMSG;
if (header_size < sizeof(struct bus_header))
return -EBADMSG;
/* on kdbus we only speak native endian gvariant, never dbus1
* marshalling or reverse endian */
if (header->version != 2 ||
header->endian != BUS_NATIVE_ENDIAN)
return -EPROTOTYPE;
r = bus_message_from_header(
bus,
header, header_size,
footer, footer_size,
n_bytes,
fds, n_fds,
NULL,
seclabel, 0, &m);
if (r < 0)
return r;
/* 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);
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->memfd_offset = d->memfd.start;
part->size = d->memfd.size;
part->sealed = true;
idx += d->memfd.size;
break;
}
case KDBUS_ITEM_PIDS:
/* The PID/TID might be missing, when the data
* is faked by a bus proxy and it lacks that
* information about the real client (since
* SO_PEERCRED is used for that). Also kernel
* namespacing might make some of this data
* unavailable when untranslatable. */
if (d->pids.pid > 0) {
m->creds.pid = (pid_t) d->pids.pid;
m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask;
}
if (d->pids.tid > 0) {
m->creds.tid = (pid_t) d->pids.tid;
m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
}
if (d->pids.ppid > 0) {
m->creds.ppid = (pid_t) d->pids.ppid;
m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
} else if (d->pids.pid == 1) {
m->creds.ppid = 0;
m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
}
break;
case KDBUS_ITEM_CREDS:
/* EUID/SUID/FSUID/EGID/SGID/FSGID might be
* missing too (see above). */
if ((uid_t) d->creds.uid != UID_INVALID) {
m->creds.uid = (uid_t) d->creds.uid;
m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask;
}
if ((uid_t) d->creds.euid != UID_INVALID) {
m->creds.euid = (uid_t) d->creds.euid;
m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask;
}
if ((uid_t) d->creds.suid != UID_INVALID) {
m->creds.suid = (uid_t) d->creds.suid;
m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask;
}
if ((uid_t) d->creds.fsuid != UID_INVALID) {
m->creds.fsuid = (uid_t) d->creds.fsuid;
m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask;
}
if ((gid_t) d->creds.gid != GID_INVALID) {
m->creds.gid = (gid_t) d->creds.gid;
m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask;
}
if ((gid_t) d->creds.egid != GID_INVALID) {
m->creds.egid = (gid_t) d->creds.egid;
m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask;
}
if ((gid_t) d->creds.sgid != GID_INVALID) {
m->creds.sgid = (gid_t) d->creds.sgid;
m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask;
}
if ((gid_t) d->creds.fsgid != GID_INVALID) {
m->creds.fsgid = (gid_t) d->creds.fsgid;
m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask;
}
break;
case KDBUS_ITEM_TIMESTAMP:
message_set_timestamp(bus, m, &d->timestamp);
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;
r = bus_get_root_path(bus);
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.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask;
m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask;
break;
case KDBUS_ITEM_CAPS:
if (d->caps.last_cap != cap_last_cap() ||
d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) {
r = -EBADMSG;
goto fail;
}
m->creds.capability = d->caps.caps;
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)) {
r = -EBADMSG;
goto fail;
}
destination = d->str;
break;
case KDBUS_ITEM_OWNED_NAME:
if (!service_name_is_valid(d->name.name)) {
r = -EBADMSG;
goto fail;
}
if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
char **wkn;
size_t n;
/* We just extend the array here, but
* do not allocate the strings inside
* of it, instead we just point to our
* buffer directly. */
n = strv_length(m->creds.well_known_names);
wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*));
if (!wkn) {
r = -ENOMEM;
goto fail;
}
wkn[n] = d->name.name;
wkn[n+1] = NULL;
m->creds.well_known_names = wkn;
m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
}
break;
case KDBUS_ITEM_CONN_DESCRIPTION:
m->creds.description = d->str;
m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask;
break;
case KDBUS_ITEM_AUXGROUPS:
if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
size_t i, n;
gid_t *g;
n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t);
g = new(gid_t, n);
if (!g) {
r = -ENOMEM;
goto fail;
}
for (i = 0; i < n; i++)
g[i] = d->data64[i];
m->creds.supplementary_gids = g;
m->creds.n_supplementary_gids = n;
m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
}
break;
case KDBUS_ITEM_FDS:
case KDBUS_ITEM_SECLABEL:
break;
default:
log_debug("Got unknown field from kernel %llu", d->type);
}
}
/* If we requested the list of well-known names to be appended
* and the sender had none no item for it will be
* attached. However, this does *not* mean that the kernel
* didn't want to provide this information to us. Hence, let's
* explicitly mark this information as available if it was
* requested. */
m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
r = bus_message_parse_fields(m);
if (r < 0)
goto fail;
/* Refuse messages if kdbus and dbus1 cookie doesn't match up */
if ((uint64_t) m->header->dbus2.cookie != k->cookie) {
r = -EBADMSG;
goto fail;
}
/* Refuse messages where the reply flag doesn't match up */
if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
r = -EBADMSG;
goto fail;
}
/* Refuse reply messages where the reply cookie doesn't match up */
if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) {
r = -EBADMSG;
goto fail;
}
/* Refuse messages where the autostart flag doesn't match up */
if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
r = -EBADMSG;
goto fail;
}
/* Override information from the user header with data from the kernel */
if (k->src_id == KDBUS_SRC_ID_KERNEL)
bus_message_set_sender_driver(bus, m);
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:
unset_memfds(m);
sd_bus_message_unref(m);
return r;
}
int bus_kernel_take_fd(sd_bus *b) {
struct kdbus_bloom_parameter *bloom = NULL;
struct kdbus_item *items, *item;
struct kdbus_cmd_hello *hello;
_cleanup_free_ char *g = NULL;
const char *name;
size_t l = 0, m = 0, sz;
int r;
assert(b);
if (b->is_server)
return -EINVAL;
b->use_memfd = 1;
if (b->description) {
g = bus_label_escape(b->description);
if (!g)
return -ENOMEM;
name = g;
} else {
char pr[17] = {};
/* If no name is explicitly set, we'll include a hint
* indicating the library implementation, a hint which
* kind of bus this is and the thread name */
assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
if (isempty(pr)) {
name = b->is_system ? "sd-system" :
b->is_user ? "sd-user" : "sd";
} else {
_cleanup_free_ char *e = NULL;
e = bus_label_escape(pr);
if (!e)
return -ENOMEM;
g = strappend(b->is_system ? "sd-system-" :
b->is_user ? "sd-user-" : "sd-",
e);
if (!g)
return -ENOMEM;
name = g;
}
b->description = bus_label_unescape(name);
if (!b->description)
return -ENOMEM;
}
m = strlen(name);
sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
if (b->fake_creds_valid)
sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
if (b->fake_pids_valid)
sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
if (b->fake_label) {
l = strlen(b->fake_label);
sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
}
hello = alloca0_align(sz, 8);
hello->size = sz;
hello->flags = b->hello_flags;
hello->attach_flags_send = _KDBUS_ATTACH_ANY;
hello->attach_flags_recv = b->attach_flags;
hello->pool_size = KDBUS_POOL_SIZE;
item = hello->items;
item->size = offsetof(struct kdbus_item, str) + m + 1;
item->type = KDBUS_ITEM_CONN_DESCRIPTION;
memcpy(item->str, name, m + 1);
item = KDBUS_ITEM_NEXT(item);
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_pids_valid) {
item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
item->type = KDBUS_ITEM_PIDS;
item->pids = b->fake_pids;
item = KDBUS_ITEM_NEXT(item);
}
if (b->fake_label) {
item->size = offsetof(struct kdbus_item, str) + l + 1;
item->type = KDBUS_ITEM_SECLABEL;
memcpy(item->str, b->fake_label, l+1);
}
r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
if (r < 0) {
if (errno == ENOTTY)
/* If the ioctl is not supported we assume that the
* API version changed in a major incompatible way,
* let's indicate an API incompatibility in this
* case. */
return -ESOCKTNOSUPPORT;
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;
r = -errno;
goto fail;
}
}
/* The higher 32bit of the bus_flags fields are considered
* 'incompatible flags'. Refuse them all for now. */
if (hello->bus_flags > 0xFFFFFFFFULL) {
r = -ESOCKTNOSUPPORT;
goto fail;
}
/* extract bloom parameters from items */
items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
KDBUS_FOREACH(item, items, hello->items_size) {
switch (item->type) {
case KDBUS_ITEM_BLOOM_PARAMETER:
bloom = &item->bloom_parameter;
break;
}
}
if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
r = -EOPNOTSUPP;
goto fail;
}
b->bloom_size = (size_t) bloom->size;
b->bloom_n_hash = (unsigned) bloom->n_hash;
if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
r = -ENOMEM;
goto fail;
}
b->unique_id = hello->id;
b->is_kernel = true;
b->bus_client = true;
b->can_fds = !!(hello->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));
/* free returned items */
(void) bus_kernel_cmd_free(b, hello->offset);
return bus_start_running(b);
fail:
(void) bus_kernel_cmd_free(b, hello->offset);
return r;
}
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_cmd_free(sd_bus *bus, uint64_t offset) {
struct kdbus_cmd_free cmd = {
.size = sizeof(cmd),
.offset = offset,
};
int r;
assert(bus);
assert(bus->is_kernel);
r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
if (r < 0)
return -errno;
return 0;
}
static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
struct kdbus_item *d;
assert(bus);
assert(k);
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)
safe_close(d->memfd.fd);
}
bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
}
int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
struct kdbus_cmd_send cmd = { };
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;
cmd.size = sizeof(cmd);
cmd.msg_address = (uintptr_t)m->kdbus;
/* If this is a synchronous method call, then let's tell the
* kernel, so that it can pass CPU time/scheduling to the
* destination for the time, if it wants to. If we
* synchronously wait for the result anyway, we won't need CPU
* anyway. */
if (hint_sync_call) {
m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
cmd.flags |= KDBUS_SEND_SYNC_REPLY;
}
r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
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_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;
} else if (hint_sync_call) {
struct kdbus_msg *k;
k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
assert(k);
if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
r = bus_kernel_make_message(bus, k);
if (r < 0) {
close_kdbus_msg(bus, k);
/* Anybody can send us invalid messages, let's just drop them. */
if (r == -EBADMSG || r == -EPROTOTYPE)
log_debug_errno(r, "Ignoring invalid synchronous reply: %m");
else
return r;
}
} else {
log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
close_kdbus_msg(bus, k);
}
}
return 1;
}
static int push_name_owner_changed(
sd_bus *bus,
const char *name,
const char *old_owner,
const char *new_owner,
const struct kdbus_timestamp *ts) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r;
assert(bus);
r = sd_bus_message_new_signal(
bus,
&m,
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"NameOwnerChanged");
if (r < 0)
return r;
r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
if (r < 0)
return r;
bus_message_set_sender_driver(bus, m);
message_set_timestamp(bus, m, ts);
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,
const struct kdbus_msg *k,
const struct kdbus_item *d,
const struct kdbus_timestamp *ts) {
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_id.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.id);
if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.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.id);
return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts);
}
static int translate_id_change(
sd_bus *bus,
const struct kdbus_msg *k,
const struct kdbus_item *d,
const struct kdbus_timestamp *ts) {
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,
ts);
}
static int translate_reply(
sd_bus *bus,
const struct kdbus_msg *k,
const struct kdbus_item *d,
const struct kdbus_timestamp *ts) {
_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;
message_set_timestamp(bus, m, ts);
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) {
static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = {
[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,
};
struct kdbus_item *d, *found = NULL;
struct kdbus_timestamp *ts = NULL;
assert(bus);
assert(k);
assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
KDBUS_ITEM_FOREACH(d, k, items) {
if (d->type == KDBUS_ITEM_TIMESTAMP)
ts = &d->timestamp;
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, ts);
}
int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
struct kdbus_msg *k;
int r;
assert(bus);
r = bus_rqueue_make_room(bus);
if (r < 0)
return r;
if (hint_priority) {
recv.flags |= KDBUS_RECV_USE_PRIORITY;
recv.priority = priority;
}
r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
if (r < 0) {
if (errno == EAGAIN)
return 0;
return -errno;
}
k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset);
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_errno(r, "Ignoring invalid message: %m");
r = 0;
}
} else if (k->payload_type == KDBUS_PAYLOAD_KERNEL)
r = bus_kernel_translate_message(bus, k);
else {
log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
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 -EOPNOTSUPP;
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 = memfd_new(bus->description);
if (r < 0)
return r;
*address = NULL;
*mapped = 0;
*allocated = 0;
return r;
}
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);
safe_close(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(memfd_set_size(fd, 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);
}
uint64_t request_name_flags_to_kdbus(uint64_t flags) {
uint64_t f = 0;
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;
return f;
}
uint64_t attach_flags_to_kdbus(uint64_t mask) {
uint64_t m = 0;
if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
m |= KDBUS_ATTACH_CREDS;
if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID))
m |= KDBUS_ATTACH_PIDS;
if (mask & SD_BUS_CREDS_COMM)
m |= KDBUS_ATTACH_PID_COMM;
if (mask & SD_BUS_CREDS_TID_COMM)
m |= KDBUS_ATTACH_TID_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;
if (mask & SD_BUS_CREDS_DESCRIPTION)
m |= KDBUS_ATTACH_CONN_DESCRIPTION;
if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
m |= KDBUS_ATTACH_AUXGROUPS;
return m;
}
int bus_kernel_create_bus(const char *name, bool world, char **s) {
struct kdbus_cmd *make;
struct kdbus_item *n;
size_t l;
int fd;
assert(name);
assert(s);
fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
return -errno;
l = strlen(name);
make = alloca0_align(offsetof(struct kdbus_cmd, items) +
ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
8);
make->size = offsetof(struct kdbus_cmd, items);
/* Set the bloom parameters */
n = make->items;
n->size = offsetof(struct kdbus_item, bloom_parameter) +
sizeof(struct kdbus_bloom_parameter);
n->type = KDBUS_ITEM_BLOOM_PARAMETER;
n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
assert_cc(DEFAULT_BLOOM_SIZE > 0);
assert_cc(DEFAULT_BLOOM_N_HASH > 0);
make->size += ALIGN8(n->size);
/* The buses we create make no restrictions on what metadata
* peers can read from incoming messages. */
n = KDBUS_ITEM_NEXT(n);
n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
n->data64[0] = _KDBUS_ATTACH_ANY;
make->size += ALIGN8(n->size);
/* Provide all metadata via bus-owner queries */
n = KDBUS_ITEM_NEXT(n);
n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
n->data64[0] = _KDBUS_ATTACH_ANY;
make->size += ALIGN8(n->size);
/* Set the a good name */
n = KDBUS_ITEM_NEXT(n);
sprintf(n->str, UID_FMT "-%s", 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 = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
safe_close(fd);
/* Major API change? then the ioctls got shuffled around. */
if (errno == ENOTTY)
return -ESOCKTNOSUPPORT;
return -errno;
}
if (s) {
char *p;
p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
if (!p) {
safe_close(fd);
return -ENOMEM;
}
*s = p;
}
return fd;
}
int bus_kernel_open_bus_fd(const char *bus, char **path) {
char *p;
int fd;
size_t len;
assert(bus);
len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
if (path) {
p = new(char, len);
if (!p)
return -ENOMEM;
} else
p = newa(char, len);
sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
if (fd < 0) {
if (path)
free(p);
return -errno;
}
if (path)
*path = p;
return fd;
}
int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) {
_cleanup_free_ char *path = NULL;
struct kdbus_cmd *make;
struct kdbus_item *n;
const char *name;
int fd;
fd = bus_kernel_open_bus_fd(bus_name, &path);
if (fd < 0)
return fd;
make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) +
ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1),
8);
make->size = ALIGN8(offsetof(struct kdbus_cmd, items));
make->flags = KDBUS_MAKE_ACCESS_WORLD;
n = make->items;
sprintf(n->str, UID_FMT "-%s", getuid(), ep_name);
n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
n->type = KDBUS_ITEM_MAKE_NAME;
make->size += ALIGN8(n->size);
name = n->str;
if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) {
safe_close(fd);
return -errno;
}
if (ep_path) {
char *p;
p = strjoin(dirname(path), "/", name, NULL);
if (!p) {
safe_close(fd);
return -ENOMEM;
}
*ep_path = p;
}
return fd;
}
int bus_kernel_try_close(sd_bus *bus) {
struct kdbus_cmd byebye = { .size = sizeof(byebye) };
assert(bus);
assert(bus->is_kernel);
if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0)
return -errno;
return 0;
}
int bus_kernel_drop_one(int fd) {
struct kdbus_cmd_recv recv = {
.size = sizeof(recv),
.flags = KDBUS_RECV_DROP,
};
assert(fd >= 0);
if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
return -errno;
return 0;
}
int bus_kernel_realize_attach_flags(sd_bus *bus) {
struct kdbus_cmd *update;
struct kdbus_item *n;
assert(bus);
assert(bus->is_kernel);
update = alloca0_align(offsetof(struct kdbus_cmd, items) +
ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
8);
n = update->items;
n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
n->data64[0] = bus->attach_flags;
update->size =
offsetof(struct kdbus_cmd, items) +
ALIGN8(n->size);
if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0)
return -errno;
return 0;
}
int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
struct kdbus_cmd_info cmd = {
.size = sizeof(struct kdbus_cmd_info),
};
struct kdbus_info *info;
struct kdbus_item *item;
char *n = NULL;
int r;
assert(bus);
assert(name);
assert(bus->is_kernel);
r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
if (r < 0)
return -errno;
info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
KDBUS_ITEM_FOREACH(item, info, items)
if (item->type == KDBUS_ITEM_MAKE_NAME) {
r = free_and_strdup(&n, item->str);
break;
}
bus_kernel_cmd_free(bus, cmd.offset);
if (r < 0)
return r;
if (!n)
return -EIO;
*name = n;
return 0;
}