bus-control.c revision 455971c1493fc6dc3125d235cf4ea6102cac626d
/*-*- 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 <stddef.h>
#include <errno.h>
#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"
#include "cgroup-util.h"
_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
int r;
assert_return(bus, -EINVAL);
assert_return(unique, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
r = bus_ensure_running(bus);
if (r < 0)
return r;
*unique = bus->unique_name;
return 0;
}
static int bus_request_name_kernel(sd_bus *bus, const char *name, uint64_t flags) {
struct kdbus_cmd_name *n;
size_t size, l;
int r;
assert(bus);
assert(name);
l = strlen(name) + 1;
size = offsetof(struct kdbus_cmd_name, items) + KDBUS_ITEM_SIZE(l);
n = alloca0_align(size, 8);
n->size = size;
kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags);
n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
n->items[0].type = KDBUS_ITEM_NAME;
memcpy(n->items[0].str, name, l);
#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)
return -errno;
if (n->flags & KDBUS_NAME_IN_QUEUE)
return 0;
return 1;
}
static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t ret, param = 0;
int r;
assert(bus);
assert(name);
if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
param |= BUS_NAME_ALLOW_REPLACEMENT;
if (flags & SD_BUS_NAME_REPLACE_EXISTING)
param |= BUS_NAME_REPLACE_EXISTING;
if (!(flags & SD_BUS_NAME_QUEUE))
param |= BUS_NAME_DO_NOT_QUEUE;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"RequestName",
NULL,
&reply,
"su",
name,
param);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &ret);
if (r < 0)
return r;
if (ret == BUS_NAME_ALREADY_OWNER)
return -EALREADY;
else if (ret == BUS_NAME_EXISTS)
return -EEXIST;
else if (ret == BUS_NAME_IN_QUEUE)
return 0;
else if (ret == BUS_NAME_PRIMARY_OWNER)
return 1;
return -EIO;
}
_public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(bus->bus_client, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
assert_return(service_name_is_valid(name), -EINVAL);
assert_return(name[0] != ':', -EINVAL);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus->is_kernel)
return bus_request_name_kernel(bus, name, flags);
else
return bus_request_name_dbus1(bus, name, flags);
}
static int bus_release_name_kernel(sd_bus *bus, const char *name) {
struct kdbus_cmd_name *n;
size_t size, l;
int r;
assert(bus);
assert(name);
l = strlen(name) + 1;
size = offsetof(struct kdbus_cmd_name, items) + KDBUS_ITEM_SIZE(l);
n = alloca0_align(size, 8);
n->size = size;
n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
n->items[0].type = KDBUS_ITEM_NAME;
memcpy(n->items[0].str, name, l);
#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 0;
}
static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t ret;
int r;
assert(bus);
assert(name);
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/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;
if (ret == BUS_NAME_NON_EXISTENT)
return -ESRCH;
if (ret == BUS_NAME_NOT_OWNER)
return -EADDRINUSE;
if (ret == BUS_NAME_RELEASED)
return 0;
return -EINVAL;
}
_public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(bus->bus_client, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(service_name_is_valid(name), -EINVAL);
assert_return(name[0] != ':', -EINVAL);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus->is_kernel)
return bus_release_name_kernel(bus, name);
else
return bus_release_name_dbus1(bus, name);
}
static int kernel_cmd_free(sd_bus *bus, uint64_t offset)
{
struct kdbus_cmd_free cmd;
int r;
assert(bus);
cmd.flags = 0;
cmd.offset = offset;
r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
if (r < 0)
return -errno;
return 0;
}
static int kernel_get_list(sd_bus *bus, uint64_t flags, char ***x) {
struct kdbus_cmd_name_list cmd = {};
struct kdbus_name_list *name_list;
struct kdbus_name_info *name;
uint64_t previous_id = 0;
int r;
/* Caller will free half-constructed list on failure... */
cmd.flags = flags;
r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
if (r < 0)
return -errno;
name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
KDBUS_ITEM_FOREACH(name, name_list, names) {
struct kdbus_item *item;
const char *entry_name = NULL;
if ((flags & KDBUS_NAME_LIST_UNIQUE) && name->owner_id != previous_id) {
char *n;
if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) {
r = -ENOMEM;
goto fail;
}
r = strv_consume(x, n);
if (r < 0)
goto fail;
previous_id = name->owner_id;
}
KDBUS_ITEM_FOREACH(item, name, items)
if (item->type == KDBUS_ITEM_OWNED_NAME)
entry_name = item->name.name;
if (entry_name && service_name_is_valid(entry_name)) {
r = strv_extend(x, entry_name);
if (r < 0) {
r = -ENOMEM;
goto fail;
}
}
}
r = 0;
fail:
kernel_cmd_free(bus, cmd.offset);
return r;
}
static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) {
_cleanup_strv_free_ char **x = NULL, **y = NULL;
int r;
if (acquired) {
r = kernel_get_list(bus, KDBUS_NAME_LIST_UNIQUE | KDBUS_NAME_LIST_NAMES, &x);
if (r < 0)
return r;
}
if (activatable) {
r = kernel_get_list(bus, KDBUS_NAME_LIST_ACTIVATORS, &y);
if (r < 0)
return r;
*activatable = y;
y = NULL;
}
if (acquired) {
*acquired = x;
x = NULL;
}
return 0;
}
static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
_cleanup_strv_free_ char **x = NULL, **y = NULL;
int r;
if (acquired) {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"ListNames",
NULL,
&reply,
NULL);
if (r < 0)
return r;
r = sd_bus_message_read_strv(reply, &x);
if (r < 0)
return r;
reply = sd_bus_message_unref(reply);
}
if (activatable) {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"ListActivatableNames",
NULL,
&reply,
NULL);
if (r < 0)
return r;
r = sd_bus_message_read_strv(reply, &y);
if (r < 0)
return r;
*activatable = y;
y = NULL;
}
if (acquired) {
*acquired = x;
x = NULL;
}
return 0;
}
_public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
assert_return(bus, -EINVAL);
assert_return(acquired || activatable, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus->is_kernel)
return bus_list_names_kernel(bus, acquired, activatable);
else
return bus_list_names_dbus1(bus, acquired, activatable);
}
static int bus_populate_creds_from_items(sd_bus *bus,
struct kdbus_info *info,
uint64_t mask,
sd_bus_creds *c) {
struct kdbus_item *item;
uint64_t m;
int r;
KDBUS_ITEM_FOREACH(item, info, items) {
switch (item->type) {
case KDBUS_ITEM_CREDS:
m = (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID | SD_BUS_CREDS_PID) & mask;
if (m) {
c->uid = (uid_t) item->creds.uid;
c->pid = (pid_t) item->creds.pid;
c->gid = (gid_t) item->creds.gid;
c->mask |= m;
}
if (mask & SD_BUS_CREDS_TID && item->creds.tid > 0) {
c->tid = (pid_t) item->creds.tid;
c->mask |= SD_BUS_CREDS_TID;
}
if (mask & SD_BUS_CREDS_PID_STARTTIME && item->creds.starttime > 0) {
c->pid_starttime = item->creds.starttime;
c->mask |= SD_BUS_CREDS_PID_STARTTIME;
}
break;
case KDBUS_ITEM_PID_COMM:
if (mask & SD_BUS_CREDS_COMM) {
c->comm = strdup(item->str);
if (!c->comm)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_COMM;
}
break;
case KDBUS_ITEM_TID_COMM:
if (mask & SD_BUS_CREDS_TID_COMM) {
c->tid_comm = strdup(item->str);
if (!c->tid_comm)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_TID_COMM;
}
break;
case KDBUS_ITEM_EXE:
if (mask & SD_BUS_CREDS_EXE) {
c->exe = strdup(item->str);
if (!c->exe)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_EXE;
}
break;
case KDBUS_ITEM_CMDLINE:
if (mask & SD_BUS_CREDS_CMDLINE) {
c->cmdline_size = item->size - KDBUS_ITEM_HEADER_SIZE;
c->cmdline = memdup(item->data, c->cmdline_size);
if (!c->cmdline)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_CMDLINE;
}
break;
case KDBUS_ITEM_CGROUP:
m = (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) & mask;
if (m) {
c->cgroup = strdup(item->str);
if (!c->cgroup)
return -ENOMEM;
r = bus_get_root_path(bus);
if (r < 0)
return r;
c->cgroup_root = strdup(bus->cgroup_root);
if (!c->cgroup_root)
return -ENOMEM;
c->mask |= m;
}
break;
case KDBUS_ITEM_CAPS:
m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS |
SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask;
if (m) {
c->capability_size = item->size - offsetof(struct kdbus_item, caps.caps);
c->capability = memdup(item->caps.caps, c->capability_size);
if (!c->capability)
return -ENOMEM;
c->mask |= m;
}
break;
case KDBUS_ITEM_SECLABEL:
if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
c->label = strdup(item->str);
if (!c->label)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
}
break;
case KDBUS_ITEM_AUDIT:
m = (SD_BUS_CREDS_AUDIT_SESSION_ID | SD_BUS_CREDS_AUDIT_LOGIN_UID) & mask;
if (m) {
c->audit_session_id = item->audit.sessionid;
c->audit_login_uid = item->audit.loginuid;
c->mask |= m;
}
break;
case KDBUS_ITEM_OWNED_NAME:
if ((mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) && service_name_is_valid(item->name.name)) {
r = strv_extend(&c->well_known_names, item->name.name);
if (r < 0)
return r;
c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
}
break;
case KDBUS_ITEM_CONN_DESCRIPTION:
if ((mask & SD_BUS_CREDS_DESCRIPTION)) {
c->description = strdup(item->str);
if (!c->description)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_DESCRIPTION;
}
break;
}
}
return 0;
}
static int bus_get_name_creds_kdbus(
sd_bus *bus,
const char *name,
uint64_t mask,
sd_bus_creds **creds) {
_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
struct kdbus_cmd_info *cmd;
struct kdbus_info *conn_info;
size_t size, l;
uint64_t id;
int r;
r = bus_kernel_parse_unique_name(name, &id);
if (r < 0)
return r;
if (r > 0) {
size = offsetof(struct kdbus_cmd_info, items);
cmd = alloca0_align(size, 8);
cmd->id = id;
} else {
l = strlen(name) + 1;
size = offsetof(struct kdbus_cmd_info, items) + KDBUS_ITEM_SIZE(l);
cmd = alloca0_align(size, 8);
cmd->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
cmd->items[0].type = KDBUS_ITEM_NAME;
memcpy(cmd->items[0].str, name, l);
}
cmd->size = size;
kdbus_translate_attach_flags(mask, (uint64_t*) &cmd->flags);
r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd);
if (r < 0)
return -errno;
conn_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
/* Non-activated names are considered not available */
if (conn_info->flags & KDBUS_HELLO_ACTIVATOR) {
if (name[0] == ':')
r = -ENXIO;
else
r = -ESRCH;
goto fail;
}
c = bus_creds_new();
if (!c) {
r = -ENOMEM;
goto fail;
}
if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0) {
r = -ENOMEM;
goto fail;
}
c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
}
r = bus_populate_creds_from_items(bus, conn_info, mask, c);
if (r < 0)
goto fail;
if (creds) {
*creds = c;
c = NULL;
}
r = 0;
fail:
kernel_cmd_free(bus, cmd->offset);
return r;
}
static int bus_get_name_creds_dbus1(
sd_bus *bus,
const char *name,
uint64_t mask,
sd_bus_creds **creds) {
_cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL;
_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
const char *unique = NULL;
pid_t pid = 0;
int r;
/* Only query the owner if the caller wants to know it or if
* the caller just wants to check whether a name exists */
if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetNameOwner",
NULL,
&reply_unique,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply_unique, "s", &unique);
if (r < 0)
return r;
}
if (mask != 0) {
c = bus_creds_new();
if (!c)
return -ENOMEM;
if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
c->unique_name = strdup(unique);
if (!c->unique_name)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
}
if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_GID|
SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
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|
SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) {
uint32_t u;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionUnixProcessID",
NULL,
&reply,
"s",
unique ? unique : 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",
"org.freedesktop.DBus",
"GetConnectionUnixUser",
NULL,
&reply,
"s",
unique ? unique : 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 = NULL;
size_t sz = 0;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionSELinuxSecurityContext",
NULL,
&reply,
"s",
unique ? unique : 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;
}
return 0;
}
_public_ int sd_bus_get_name_creds(
sd_bus *bus,
const char *name,
uint64_t mask,
sd_bus_creds **creds) {
assert_return(bus, -EINVAL);
assert_return(name, -EINVAL);
assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
assert_return(mask == 0 || creds, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
assert_return(service_name_is_valid(name), -EINVAL);
assert_return(bus->bus_client, -ENODATA);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus->is_kernel)
return bus_get_name_creds_kdbus(bus, name, mask, creds);
else
return bus_get_name_creds_dbus1(bus, name, mask, creds);
}
_public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
pid_t pid = 0;
int r;
assert_return(bus, -EINVAL);
assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
assert_return(ret, -EINVAL);
assert_return(!bus_pid_changed(bus), -ECHILD);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (!bus->ucred_valid && !isempty(bus->label))
return -ENODATA;
c = bus_creds_new();
if (!c)
return -ENOMEM;
if (bus->ucred_valid) {
pid = c->pid = bus->ucred.pid;
c->uid = bus->ucred.uid;
c->gid = bus->ucred.gid;
c->mask |= (SD_BUS_CREDS_UID | SD_BUS_CREDS_PID | SD_BUS_CREDS_GID) & mask;
}
if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) {
c->label = strdup(bus->label);
if (!c->label)
return -ENOMEM;
c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
}
if (bus->is_kernel) {
struct kdbus_cmd_info cmd = {};
struct kdbus_info *creator_info;
cmd.size = sizeof(cmd);
r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
if (r < 0)
return -errno;
creator_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
r = bus_populate_creds_from_items(bus, creator_info, mask, c);
kernel_cmd_free(bus, cmd.offset);
if (r < 0)
return r;
} else {
r = bus_creds_add_more(c, mask, pid, 0);
if (r < 0)
return r;
}
*ret = c;
c = NULL;
return 0;
}
static int add_name_change_match(sd_bus *bus,
uint64_t cookie,
const char *name,
const char *old_owner,
const char *new_owner) {
uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0;
int is_name_id = -1, r;
struct kdbus_item *item;
assert(bus);
/* If we encounter a match that could match against
* NameOwnerChanged messages, then we need to create
* KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and
* KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly
* multiple if the match is underspecified.
*
* The NameOwnerChanged signals take three parameters with
* unique or well-known names, but only some forms actually
* exist:
*
* WELLKNOWN, "", UNIQUE → KDBUS_ITEM_NAME_ADD
* WELLKNOWN, UNIQUE, "" → KDBUS_ITEM_NAME_REMOVE
* WELLKNOWN, UNIQUE, UNIQUE → KDBUS_ITEM_NAME_CHANGE
* UNIQUE, "", UNIQUE → KDBUS_ITEM_ID_ADD
* UNIQUE, UNIQUE, "" → KDBUS_ITEM_ID_REMOVE
*
* For the latter two the two unique names must be identical.
*
* */
if (name) {
is_name_id = bus_kernel_parse_unique_name(name, &name_id);
if (is_name_id < 0)
return 0;
}
if (!isempty(old_owner)) {
r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
if (r < 0)
return 0;
if (r == 0)
return 0;
if (is_name_id > 0 && old_owner_id != name_id)
return 0;
} else
old_owner_id = KDBUS_MATCH_ID_ANY;
if (!isempty(new_owner)) {
r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
if (r < 0)
return r;
if (r == 0)
return 0;
if (is_name_id > 0 && new_owner_id != name_id)
return 0;
} else
new_owner_id = KDBUS_MATCH_ID_ANY;
if (is_name_id <= 0) {
struct kdbus_cmd_match *m;
size_t sz, l;
/* If the name argument is missing or is a well-known
* name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE}
* matches for it */
l = name ? strlen(name) + 1 : 0;
sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
offsetof(struct kdbus_item, name_change) +
offsetof(struct kdbus_notify_name_change, name) +
l);
m = alloca0_align(sz, 8);
m->size = sz;
m->cookie = cookie;
item = m->items;
item->size =
offsetof(struct kdbus_item, name_change) +
offsetof(struct kdbus_notify_name_change, name) +
l;
item->name_change.old_id.id = old_owner_id;
item->name_change.new_id.id = new_owner_id;
if (name)
memcpy(item->name_change.name, name, l);
/* If the old name is unset or empty, then
* this can match against added names */
if (!old_owner || old_owner[0] == 0) {
item->type = KDBUS_ITEM_NAME_ADD;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
}
/* If the new name is unset or empty, then
* this can match against removed names */
if (!new_owner || new_owner[0] == 0) {
item->type = KDBUS_ITEM_NAME_REMOVE;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
}
/* The CHANGE match we need in either case, because
* what is reported as a name change by the kernel
* might just be an owner change between starter and
* normal clients. For userspace such a change should
* be considered a removal/addition, hence let's
* subscribe to this unconditionally. */
item->type = KDBUS_ITEM_NAME_CHANGE;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
}
if (is_name_id != 0) {
struct kdbus_cmd_match *m;
uint64_t sz;
/* If the name argument is missing or is a unique
* name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches
* for it */
sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
offsetof(struct kdbus_item, id_change) +
sizeof(struct kdbus_notify_id_change));
m = alloca0_align(sz, 8);
m->size = sz;
m->cookie = cookie;
item = m->items;
item->size =
offsetof(struct kdbus_item, id_change) +
sizeof(struct kdbus_notify_id_change);
item->id_change.id = name_id;
/* If the old name is unset or empty, then this can
* match against added ids */
if (!old_owner || old_owner[0] == 0) {
item->type = KDBUS_ITEM_ID_ADD;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
}
/* If thew new name is unset or empty, then this can
* match against removed ids */
if (!new_owner || new_owner[0] == 0) {
item->type = KDBUS_ITEM_ID_REMOVE;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
}
}
return 0;
}
int bus_add_match_internal_kernel(
sd_bus *bus,
struct bus_match_component *components,
unsigned n_components,
uint64_t cookie) {
struct kdbus_cmd_match *m;
struct kdbus_item *item;
uint64_t *bloom;
size_t sz;
const char *sender = NULL;
size_t sender_length = 0;
uint64_t src_id = KDBUS_MATCH_ID_ANY;
bool using_bloom = false;
unsigned i;
bool matches_name_change = true;
const char *name_change_arg[3] = {};
int r;
assert(bus);
bloom = alloca0(bus->bloom_size);
sz = ALIGN8(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:
if (!streq(c->value_str, "org.freedesktop.DBus"))
matches_name_change = false;
r = bus_kernel_parse_unique_name(c->value_str, &src_id);
if (r < 0)
return r;
else if (r > 0)
sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t));
else {
sender = c->value_str;
sender_length = strlen(sender);
sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
}
break;
case BUS_MATCH_MESSAGE_TYPE:
if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
matches_name_change = false;
bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "message-type", bus_message_type_to_string(c->value_u8));
using_bloom = true;
break;
case BUS_MATCH_INTERFACE:
if (!streq(c->value_str, "org.freedesktop.DBus"))
matches_name_change = false;
bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "interface", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_MEMBER:
if (!streq(c->value_str, "NameOwnerChanged"))
matches_name_change = false;
bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "member", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_PATH:
if (!streq(c->value_str, "/org/freedesktop/DBus"))
matches_name_change = false;
bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_PATH_NAMESPACE:
if (!streq(c->value_str, "/")) {
bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "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];
if (c->type - BUS_MATCH_ARG < 3)
name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str;
snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, 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, bus->bloom_size, bus->bloom_n_hash, 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, bus->bloom_size, bus->bloom_n_hash, 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) + bus->bloom_size);
m = alloca0_align(sz, 8);
m->size = sz;
m->cookie = cookie;
item = m->items;
if (src_id != KDBUS_MATCH_ID_ANY) {
item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t);
item->type = KDBUS_ITEM_ID;
item->id = src_id;
item = KDBUS_ITEM_NEXT(item);
}
if (using_bloom) {
item->size = offsetof(struct kdbus_item, data64) + bus->bloom_size;
item->type = KDBUS_ITEM_BLOOM_MASK;
memcpy(item->data64, bloom, bus->bloom_size);
item = KDBUS_ITEM_NEXT(item);
}
if (sender) {
item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
item->type = KDBUS_ITEM_NAME;
memcpy(item->str, sender, sender_length + 1);
}
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
if (matches_name_change) {
/* If this match could theoretically match
* NameOwnerChanged messages, we need to
* install a second non-bloom filter explitly
* for it */
r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
if (r < 0)
return r;
}
return 0;
}
#define internal_match(bus, m) \
((bus)->hello_flags & KDBUS_HELLO_MONITOR \
? (isempty(m) ? "eavesdrop='true'" : strappenda((m), ",eavesdrop='true'")) \
: (m))
static int bus_add_match_internal_dbus1(
sd_bus *bus,
const char *match) {
const char *e;
assert(bus);
assert(match);
e = internal_match(bus, match);
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"AddMatch",
NULL,
NULL,
"s",
e);
}
int bus_add_match_internal(
sd_bus *bus,
const char *match,
struct bus_match_component *components,
unsigned n_components,
uint64_t cookie) {
assert(bus);
if (bus->is_kernel)
return bus_add_match_internal_kernel(bus, components, n_components, cookie);
else
return bus_add_match_internal_dbus1(bus, match);
}
int bus_remove_match_internal_kernel(
sd_bus *bus,
uint64_t cookie) {
struct kdbus_cmd_match m;
int r;
assert(bus);
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;
return 0;
}
static int bus_remove_match_internal_dbus1(
sd_bus *bus,
const char *match) {
const char *e;
assert(bus);
assert(match);
e = internal_match(bus, match);
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"RemoveMatch",
NULL,
NULL,
"s",
e);
}
int bus_remove_match_internal(
sd_bus *bus,
const char *match,
uint64_t cookie) {
assert(bus);
if (bus->is_kernel)
return bus_remove_match_internal_kernel(bus, cookie);
else
return bus_remove_match_internal_dbus1(bus, match);
}
_public_ int sd_bus_get_name_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_pid_changed(bus), -ECHILD);
assert_return(service_name_is_valid(name), -EINVAL);
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (streq_ptr(name, bus->unique_name))
return sd_id128_get_machine(machine);
r = sd_bus_message_new_method_call(
bus,
&m,
name,
"/",
"org.freedesktop.DBus.Peer",
"GetMachineId");
if (r < 0)
return r;
r = sd_bus_message_set_auto_start(m, false);
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);
}