/*-*- 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 .
***/
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include
#endif
#include
#include
#include "strv.h"
#include "sd-bus.h"
#include "bus-internal.h"
#include "bus-message.h"
#include "bus-control.h"
#include "bus-bloom.h"
#include "bus-util.h"
_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
int r;
if (!bus)
return -EINVAL;
if (!unique)
return -EINVAL;
if (bus_pid_changed(bus))
return -ECHILD;
r = bus_ensure_running(bus);
if (r < 0)
return r;
*unique = bus->unique_name;
return 0;
}
_public_ int sd_bus_request_name(sd_bus *bus, const char *name, int flags) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t ret;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!bus->bus_client)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
if (bus->is_kernel) {
struct kdbus_cmd_name *n;
size_t l;
l = strlen(name);
n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
n->flags = flags;
memcpy(n->name, name, l+1);
#ifdef HAVE_VALGRIND_MEMCHECK_H
VALGRIND_MAKE_MEM_DEFINED(n, n->size);
#endif
r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
if (r < 0) {
if (errno == -EALREADY)
return SD_BUS_NAME_ALREADY_OWNER;
if (errno == -EEXIST)
return SD_BUS_NAME_EXISTS;
return -errno;
}
if (n->flags & KDBUS_NAME_IN_QUEUE)
return SD_BUS_NAME_IN_QUEUE;
return SD_BUS_NAME_PRIMARY_OWNER;
} else {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"RequestName",
NULL,
&reply,
"su",
name,
flags);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &ret);
if (r < 0)
return r;
return ret;
}
}
_public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t ret;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!bus->bus_client)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
if (bus->is_kernel) {
struct kdbus_cmd_name *n;
size_t l;
l = strlen(name);
n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
memcpy(n->name, name, l+1);
#ifdef HAVE_VALGRIND_MEMCHECK_H
VALGRIND_MAKE_MEM_DEFINED(n, n->size);
#endif
r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
if (r < 0)
return -errno;
return n->flags;
} else {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"ReleaseName",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &ret);
if (r < 0)
return r;
}
return ret;
}
_public_ int sd_bus_list_names(sd_bus *bus, char ***l) {
_cleanup_bus_message_unref_ sd_bus_message *reply1 = NULL, *reply2 = NULL;
char **x = NULL;
int r;
if (!bus)
return -EINVAL;
if (!l)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
if (bus->is_kernel) {
_cleanup_free_ struct kdbus_cmd_names *names = NULL;
struct kdbus_cmd_name *name;
size_t size;
/* assume 8k size first. If that doesn't suffice, kdbus will tell us
* how big the buffer needs to be. */
size = 8192;
for(;;) {
names = realloc(names, size);
if (!names)
return -ENOMEM;
names->size = size;
names->flags = KDBUS_NAME_LIST_UNIQUE_NAMES;
r = ioctl(sd_bus_get_fd(bus), KDBUS_CMD_NAME_LIST, names);
if (r < 0) {
if (errno == ENOBUFS && size != names->size) {
size = names->size;
continue;
}
return -errno;
}
break;
}
KDBUS_PART_FOREACH(name, names, names) {
char *n;
if (name->size > sizeof(*name))
n = name->name;
else
asprintf(&n, ":1.%llu", (unsigned long long) name->id);
r = strv_extend(&x, n);
if (r < 0)
return -ENOMEM;
}
*l = x;
} else {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"ListNames",
NULL,
&reply1,
NULL);
if (r < 0)
return r;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"ListActivatableNames",
NULL,
&reply2,
NULL);
if (r < 0)
return r;
r = bus_message_read_strv_extend(reply1, &x);
if (r < 0) {
strv_free(x);
return r;
}
r = bus_message_read_strv_extend(reply2, &x);
if (r < 0) {
strv_free(x);
return r;
}
*l = strv_uniq(x);
}
return 0;
}
_public_ int sd_bus_get_owner(
sd_bus *bus,
const char *name,
uint64_t mask,
char **owner,
sd_bus_creds **creds) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
_cleanup_free_ char *unique = NULL;
pid_t pid = 0;
int r;
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(mask <= _SD_BUS_CREDS_MAX, -ENOTSUP);
assert_return(mask == 0 || creds, -EINVAL);
assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
assert_return(!bus_pid_changed(bus), -ECHILD);
/* Only query the owner if the caller wants to know it or if
* the caller just wants to check whether a name exists */
if (owner || mask == 0) {
const char *found;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"GetNameOwner",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "s", &found);
if (r < 0)
return r;
unique = strdup(found);
if (!unique)
return -ENOMEM;
reply = sd_bus_message_unref(reply);
}
if (mask != 0) {
c = bus_creds_new();
if (!c)
return -ENOMEM;
if ((mask & SD_BUS_CREDS_PID) ||
mask & ~(SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|SD_BUS_CREDS_SELINUX_CONTEXT)) {
uint32_t u;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"GetConnectionUnixProcessID",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &u);
if (r < 0)
return r;
pid = u;
if (mask & SD_BUS_CREDS_PID) {
c->pid = u;
c->mask |= SD_BUS_CREDS_PID;
}
reply = sd_bus_message_unref(reply);
}
if (mask & SD_BUS_CREDS_UID) {
uint32_t u;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"GetConnectionUnixUser",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &u);
if (r < 0)
return r;
c->uid = u;
c->mask |= SD_BUS_CREDS_UID;
reply = sd_bus_message_unref(reply);
}
if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
const void *p;
size_t sz;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"GetConnectionSELinuxSecurityContext",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read_array(reply, 'y', &p, &sz);
if (r < 0)
return r;
c->label = strndup(p, sz);
if (!c->label)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
}
r = bus_creds_add_more(c, mask, pid, 0);
if (r < 0)
return r;
}
if (creds) {
*creds = c;
c = NULL;
}
if (owner) {
*owner = unique;
unique = NULL;
}
return 0;
}
int bus_add_match_internal(
sd_bus *bus,
const char *match,
struct bus_match_component *components,
unsigned n_components,
uint64_t cookie) {
int r;
assert(bus);
assert(match);
if (bus->is_kernel) {
struct kdbus_cmd_match *m;
struct kdbus_item *item;
uint64_t bloom[BLOOM_SIZE/8];
size_t sz;
const char *sender = NULL;
size_t sender_length = 0;
uint64_t src_id = KDBUS_MATCH_SRC_ID_ANY;
bool using_bloom = false;
unsigned i;
zero(bloom);
sz = offsetof(struct kdbus_cmd_match, items);
for (i = 0; i < n_components; i++) {
struct bus_match_component *c = &components[i];
switch (c->type) {
case BUS_MATCH_SENDER:
r = bus_kernel_parse_unique_name(c->value_str, &src_id);
if (r < 0)
return r;
if (r > 0) {
sender = c->value_str;
sender_length = strlen(sender);
sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
}
break;
case BUS_MATCH_MESSAGE_TYPE:
bloom_add_pair(bloom, "message-type", bus_message_type_to_string(c->value_u8));
using_bloom = true;
break;
case BUS_MATCH_INTERFACE:
bloom_add_pair(bloom, "interface", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_MEMBER:
bloom_add_pair(bloom, "member", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_PATH:
bloom_add_pair(bloom, "path", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_PATH_NAMESPACE:
if (!streq(c->value_str, "/")) {
bloom_add_pair(bloom, "path-slash-prefix", c->value_str);
using_bloom = true;
}
break;
case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
char buf[sizeof("arg")-1 + 2 + 1];
snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
bloom_add_pair(bloom, buf, c->value_str);
using_bloom = true;
break;
}
case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
bloom_add_pair(bloom, buf, c->value_str);
using_bloom = true;
break;
}
case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
bloom_add_pair(bloom, buf, c->value_str);
using_bloom = true;
break;
}
case BUS_MATCH_DESTINATION:
/* The bloom filter does not include
the destination, since it is only
available for broadcast messages
which do not carry a destination
since they are undirected. */
break;
case BUS_MATCH_ROOT:
case BUS_MATCH_VALUE:
case BUS_MATCH_LEAF:
case _BUS_MATCH_NODE_TYPE_MAX:
case _BUS_MATCH_NODE_TYPE_INVALID:
assert_not_reached("Invalid match type?");
}
}
if (using_bloom)
sz += ALIGN8(offsetof(struct kdbus_item, data64) + BLOOM_SIZE);
m = alloca0(sz);
m->size = sz;
m->cookie = cookie;
m->src_id = src_id;
item = m->items;
if (using_bloom) {
item->size = offsetof(struct kdbus_item, data64) + BLOOM_SIZE;
item->type = KDBUS_MATCH_BLOOM;
memcpy(item->data64, bloom, BLOOM_SIZE);
item = KDBUS_PART_NEXT(item);
}
if (sender) {
item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
item->type = KDBUS_MATCH_SRC_NAME;
memcpy(item->str, sender, sender_length + 1);
}
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
} else {
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"AddMatch",
NULL,
NULL,
"s",
match);
}
return 0;
}
int bus_remove_match_internal(
sd_bus *bus,
const char *match,
uint64_t cookie) {
int r;
assert(bus);
assert(match);
if (bus->is_kernel) {
struct kdbus_cmd_match m;
zero(m);
m.size = offsetof(struct kdbus_cmd_match, items);
m.cookie = cookie;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
if (r < 0)
return -errno;
} else {
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"RemoveMatch",
NULL,
NULL,
"s",
match);
}
return 0;
}
_public_ int sd_bus_get_owner_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
const char *mid;
int r;
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(machine, -EINVAL);
assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
assert_return(!bus_pid_changed(bus), -ECHILD);
if (streq_ptr(name, bus->unique_name))
return sd_id128_get_machine(machine);
r = sd_bus_message_new_method_call(
bus,
name,
"/",
"org.freedesktop.DBus.Peer",
"GetMachineId", &m);
if (r < 0)
return r;
r = sd_bus_message_set_no_auto_start(m, true);
if (r < 0)
return r;
r = sd_bus_call(bus, m, 0, NULL, &reply);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "s", &mid);
if (r < 0)
return r;
return sd_id128_from_string(mid, machine);
}