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Systemd/src/shared/bus-util.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
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/>.
***/
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <unistd.h>
#include "sd-bus-protocol.h"
#include "sd-bus.h"
#include "sd-daemon.h"
#include "sd-event.h"
#include "sd-id128.h"
#include "alloc-util.h"
#include "bus-internal.h"
#include "bus-label.h"
#include "bus-message.h"
#include "bus-util.h"
#include "cap-list.h"
#include "cgroup-util.h"
#include "def.h"
#include "escape.h"
#include "fd-util.h"
#include "missing.h"
#include "mount-util.h"
#include "nsflags.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "rlimit-util.h"
#include "stdio-util.h"
#include "strv.h"
#include "user-util.h"
static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
sd_event *e = userdata;
assert(m);
assert(e);
sd_bus_close(sd_bus_message_get_bus(m));
sd_event_exit(e, 0);
return 1;
}
int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
const char *match;
const char *unique;
int r;
assert(e);
assert(bus);
assert(name);
/* We unregister the name here and then wait for the
* NameOwnerChanged signal for this event to arrive before we
* quit. We do this in order to make sure that any queued
* requests are still processed before we really exit. */
r = sd_bus_get_unique_name(bus, &unique);
if (r < 0)
return r;
match = strjoina(
"sender='org.freedesktop.DBus',"
"type='signal',"
"interface='org.freedesktop.DBus',"
"member='NameOwnerChanged',"
"path='/org/freedesktop/DBus',"
"arg0='", name, "',",
"arg1='", unique, "',",
"arg2=''");
r = sd_bus_add_match_async(bus, NULL, match, name_owner_change_callback, NULL, e);
if (r < 0)
return r;
r = sd_bus_release_name_async(bus, NULL, name, NULL, NULL);
if (r < 0)
return r;
return 0;
}
int bus_event_loop_with_idle(
sd_event *e,
sd_bus *bus,
const char *name,
usec_t timeout,
check_idle_t check_idle,
void *userdata) {
bool exiting = false;
int r, code;
assert(e);
assert(bus);
assert(name);
for (;;) {
bool idle;
r = sd_event_get_state(e);
if (r < 0)
return r;
if (r == SD_EVENT_FINISHED)
break;
if (check_idle)
idle = check_idle(userdata);
else
idle = true;
r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
if (r < 0)
return r;
if (r == 0 && !exiting && idle) {
r = sd_bus_try_close(bus);
if (r == -EBUSY)
continue;
/* Fallback for dbus1 connections: we
* unregister the name and wait for the
* response to come through for it */
if (r == -EOPNOTSUPP) {
/* Inform the service manager that we
* are going down, so that it will
* queue all further start requests,
* instead of assuming we are already
* running. */
sd_notify(false, "STOPPING=1");
r = bus_async_unregister_and_exit(e, bus, name);
if (r < 0)
return r;
exiting = true;
continue;
}
if (r < 0)
return r;
sd_event_exit(e, 0);
break;
}
}
r = sd_event_get_exit_code(e, &code);
if (r < 0)
return r;
return code;
}
int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
int r, has_owner = 0;
assert(c);
assert(name);
r = sd_bus_call_method(c,
"org.freedesktop.DBus",
"/org/freedesktop/dbus",
"org.freedesktop.DBus",
"NameHasOwner",
error,
&rep,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read_basic(rep, 'b', &has_owner);
if (r < 0)
return sd_bus_error_set_errno(error, r);
return has_owner;
}
static int check_good_user(sd_bus_message *m, uid_t good_user) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
uid_t sender_uid;
int r;
assert(m);
if (good_user == UID_INVALID)
return 0;
r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
if (r < 0)
return r;
/* Don't trust augmented credentials for authorization */
assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
r = sd_bus_creds_get_euid(creds, &sender_uid);
if (r < 0)
return r;
return sender_uid == good_user;
}
int bus_test_polkit(
sd_bus_message *call,
int capability,
const char *action,
const char **details,
uid_t good_user,
bool *_challenge,
sd_bus_error *e) {
int r;
assert(call);
assert(action);
/* Tests non-interactively! */
r = check_good_user(call, good_user);
if (r != 0)
return r;
r = sd_bus_query_sender_privilege(call, capability);
if (r < 0)
return r;
else if (r > 0)
return 1;
#if ENABLE_POLKIT
else {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
int authorized = false, challenge = false;
const char *sender, **k, **v;
sender = sd_bus_message_get_sender(call);
if (!sender)
return -EBADMSG;
r = sd_bus_message_new_method_call(
call->bus,
&request,
"org.freedesktop.PolicyKit1",
"/org/freedesktop/PolicyKit1/Authority",
"org.freedesktop.PolicyKit1.Authority",
"CheckAuthorization");
if (r < 0)
return r;
r = sd_bus_message_append(
request,
"(sa{sv})s",
"system-bus-name", 1, "name", "s", sender,
action);
if (r < 0)
return r;
r = sd_bus_message_open_container(request, 'a', "{ss}");
if (r < 0)
return r;
STRV_FOREACH_PAIR(k, v, details) {
r = sd_bus_message_append(request, "{ss}", *k, *v);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(request);
if (r < 0)
return r;
r = sd_bus_message_append(request, "us", 0, NULL);
if (r < 0)
return r;
r = sd_bus_call(call->bus, request, 0, e, &reply);
if (r < 0) {
/* Treat no PK available as access denied */
if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
sd_bus_error_free(e);
return -EACCES;
}
return r;
}
r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
if (r < 0)
return r;
r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
if (r < 0)
return r;
if (authorized)
return 1;
if (_challenge) {
*_challenge = challenge;
return 0;
}
}
#endif
return -EACCES;
}
#if ENABLE_POLKIT
typedef struct AsyncPolkitQuery {
sd_bus_message *request, *reply;
sd_bus_message_handler_t callback;
void *userdata;
sd_bus_slot *slot;
Hashmap *registry;
} AsyncPolkitQuery;
static void async_polkit_query_free(AsyncPolkitQuery *q) {
if (!q)
return;
sd_bus_slot_unref(q->slot);
if (q->registry && q->request)
hashmap_remove(q->registry, q->request);
sd_bus_message_unref(q->request);
sd_bus_message_unref(q->reply);
free(q);
}
static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
AsyncPolkitQuery *q = userdata;
int r;
assert(reply);
assert(q);
q->slot = sd_bus_slot_unref(q->slot);
q->reply = sd_bus_message_ref(reply);
r = sd_bus_message_rewind(q->request, true);
if (r < 0) {
r = sd_bus_reply_method_errno(q->request, r, NULL);
goto finish;
}
r = q->callback(q->request, q->userdata, &error_buffer);
r = bus_maybe_reply_error(q->request, r, &error_buffer);
finish:
async_polkit_query_free(q);
return r;
}
#endif
int bus_verify_polkit_async(
sd_bus_message *call,
int capability,
const char *action,
const char **details,
bool interactive,
uid_t good_user,
Hashmap **registry,
sd_bus_error *error) {
#if ENABLE_POLKIT
_cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
AsyncPolkitQuery *q;
const char *sender, **k, **v;
sd_bus_message_handler_t callback;
void *userdata;
int c;
#endif
int r;
assert(call);
assert(action);
assert(registry);
r = check_good_user(call, good_user);
if (r != 0)
return r;
#if ENABLE_POLKIT
q = hashmap_get(*registry, call);
if (q) {
int authorized, challenge;
/* This is the second invocation of this function, and
* there's already a response from polkit, let's
* process it */
assert(q->reply);
if (sd_bus_message_is_method_error(q->reply, NULL)) {
const sd_bus_error *e;
/* Copy error from polkit reply */
e = sd_bus_message_get_error(q->reply);
sd_bus_error_copy(error, e);
/* Treat no PK available as access denied */
if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
return -EACCES;
return -sd_bus_error_get_errno(e);
}
r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
if (r >= 0)
r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
if (r < 0)
return r;
if (authorized)
return 1;
if (challenge)
return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
return -EACCES;
}
#endif
r = sd_bus_query_sender_privilege(call, capability);
if (r < 0)
return r;
else if (r > 0)
return 1;
#if ENABLE_POLKIT
if (sd_bus_get_current_message(call->bus) != call)
return -EINVAL;
callback = sd_bus_get_current_handler(call->bus);
if (!callback)
return -EINVAL;
userdata = sd_bus_get_current_userdata(call->bus);
sender = sd_bus_message_get_sender(call);
if (!sender)
return -EBADMSG;
c = sd_bus_message_get_allow_interactive_authorization(call);
if (c < 0)
return c;
if (c > 0)
interactive = true;
r = hashmap_ensure_allocated(registry, NULL);
if (r < 0)
return r;
r = sd_bus_message_new_method_call(
call->bus,
&pk,
"org.freedesktop.PolicyKit1",
"/org/freedesktop/PolicyKit1/Authority",
"org.freedesktop.PolicyKit1.Authority",
"CheckAuthorization");
if (r < 0)
return r;
r = sd_bus_message_append(
pk,
"(sa{sv})s",
"system-bus-name", 1, "name", "s", sender,
action);
if (r < 0)
return r;
r = sd_bus_message_open_container(pk, 'a', "{ss}");
if (r < 0)
return r;
STRV_FOREACH_PAIR(k, v, details) {
r = sd_bus_message_append(pk, "{ss}", *k, *v);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(pk);
if (r < 0)
return r;
r = sd_bus_message_append(pk, "us", !!interactive, NULL);
if (r < 0)
return r;
q = new0(AsyncPolkitQuery, 1);
if (!q)
return -ENOMEM;
q->request = sd_bus_message_ref(call);
q->callback = callback;
q->userdata = userdata;
r = hashmap_put(*registry, call, q);
if (r < 0) {
async_polkit_query_free(q);
return r;
}
q->registry = *registry;
r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
if (r < 0) {
async_polkit_query_free(q);
return r;
}
return 0;
#endif
return -EACCES;
}
void bus_verify_polkit_async_registry_free(Hashmap *registry) {
#if ENABLE_POLKIT
hashmap_free_with_destructor(registry, async_polkit_query_free);
#endif
}
int bus_check_peercred(sd_bus *c) {
struct ucred ucred;
int fd, r;
assert(c);
fd = sd_bus_get_fd(c);
if (fd < 0)
return fd;
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
if (ucred.uid != 0 && ucred.uid != geteuid())
return -EPERM;
return 1;
}
int bus_connect_system_systemd(sd_bus **_bus) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
int r;
assert(_bus);
if (geteuid() != 0)
return sd_bus_default_system(_bus);
/* If we are root then let's talk directly to the system
* instance, instead of going via the bus */
r = sd_bus_new(&bus);
if (r < 0)
return r;
r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
if (r < 0)
return r;
r = sd_bus_start(bus);
if (r < 0)
return sd_bus_default_system(_bus);
r = bus_check_peercred(bus);
if (r < 0)
return r;
*_bus = bus;
bus = NULL;
return 0;
}
int bus_connect_user_systemd(sd_bus **_bus) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
_cleanup_free_ char *ee = NULL;
const char *e;
int r;
assert(_bus);
e = secure_getenv("XDG_RUNTIME_DIR");
if (!e)
return sd_bus_default_user(_bus);
ee = bus_address_escape(e);
if (!ee)
return -ENOMEM;
r = sd_bus_new(&bus);
if (r < 0)
return r;
bus->address = strjoin("unix:path=", ee, "/systemd/private");
if (!bus->address)
return -ENOMEM;
r = sd_bus_start(bus);
if (r < 0)
return sd_bus_default_user(_bus);
r = bus_check_peercred(bus);
if (r < 0)
return r;
*_bus = bus;
bus = NULL;
return 0;
}
#define print_property(name, fmt, ...) \
do { \
if (value) \
printf(fmt "\n", __VA_ARGS__); \
else \
printf("%s=" fmt "\n", name, __VA_ARGS__); \
} while (0)
int bus_print_property(const char *name, sd_bus_message *m, bool value, bool all) {
char type;
const char *contents;
int r;
assert(name);
assert(m);
r = sd_bus_message_peek_type(m, &type, &contents);
if (r < 0)
return r;
switch (type) {
case SD_BUS_TYPE_STRING: {
const char *s;
r = sd_bus_message_read_basic(m, type, &s);
if (r < 0)
return r;
if (all || !isempty(s)) {
bool good;
/* This property has a single value, so we need to take
* care not to print a new line, everything else is OK. */
good = !strchr(s, '\n');
print_property(name, "%s", good ? s : "[unprintable]");
}
return 1;
}
case SD_BUS_TYPE_BOOLEAN: {
int b;
r = sd_bus_message_read_basic(m, type, &b);
if (r < 0)
return r;
print_property(name, "%s", yes_no(b));
return 1;
}
case SD_BUS_TYPE_UINT64: {
uint64_t u;
r = sd_bus_message_read_basic(m, type, &u);
if (r < 0)
return r;
/* Yes, heuristics! But we can change this check
* should it turn out to not be sufficient */
if (endswith(name, "Timestamp") || STR_IN_SET(name, "NextElapseUSecRealtime", "LastTriggerUSec")) {
char timestamp[FORMAT_TIMESTAMP_MAX], *t;
t = format_timestamp(timestamp, sizeof(timestamp), u);
if (t || all)
print_property(name, "%s", strempty(t));
} else if (strstr(name, "USec")) {
char timespan[FORMAT_TIMESPAN_MAX];
print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
} else if (streq(name, "RestrictNamespaces")) {
_cleanup_free_ char *s = NULL;
const char *result;
if ((u & NAMESPACE_FLAGS_ALL) == 0)
result = "yes";
else if ((u & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL)
result = "no";
else {
r = namespace_flag_to_string_many(u, &s);
if (r < 0)
return r;
result = s;
}
print_property(name, "%s", result);
} else if (streq(name, "MountFlags")) {
const char *result;
result = mount_propagation_flags_to_string(u);
if (!result)
return -EINVAL;
print_property(name, "%s", result);
} else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) {
_cleanup_free_ char *s = NULL;
r = capability_set_to_string_alloc(u, &s);
if (r < 0)
return r;
print_property(name, "%s", s);
} else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) ||
(STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) ||
(STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) ||
(STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) ||
(endswith(name, "NSec") && u == (uint64_t) -1))
print_property(name, "%s", "[not set]");
else if ((STR_IN_SET(name, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) ||
(STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) ||
(startswith(name, "Limit") && u == (uint64_t) -1) ||
(startswith(name, "DefaultLimit") && u == (uint64_t) -1))
print_property(name, "%s", "infinity");
else
print_property(name, "%"PRIu64, u);
return 1;
}
case SD_BUS_TYPE_INT64: {
int64_t i;
r = sd_bus_message_read_basic(m, type, &i);
if (r < 0)
return r;
print_property(name, "%"PRIi64, i);
return 1;
}
case SD_BUS_TYPE_UINT32: {
uint32_t u;
r = sd_bus_message_read_basic(m, type, &u);
if (r < 0)
return r;
if (strstr(name, "UMask") || strstr(name, "Mode"))
print_property(name, "%04o", u);
else if (streq(name, "UID")) {
if (u == UID_INVALID)
print_property(name, "%s", "[not set]");
else
print_property(name, "%"PRIu32, u);
} else if (streq(name, "GID")) {
if (u == GID_INVALID)
print_property(name, "%s", "[not set]");
else
print_property(name, "%"PRIu32, u);
} else
print_property(name, "%"PRIu32, u);
return 1;
}
case SD_BUS_TYPE_INT32: {
int32_t i;
r = sd_bus_message_read_basic(m, type, &i);
if (r < 0)
return r;
print_property(name, "%"PRIi32, i);
return 1;
}
case SD_BUS_TYPE_DOUBLE: {
double d;
r = sd_bus_message_read_basic(m, type, &d);
if (r < 0)
return r;
print_property(name, "%g", d);
return 1;
}
case SD_BUS_TYPE_ARRAY:
if (streq(contents, "s")) {
bool first = true;
const char *str;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, contents);
if (r < 0)
return r;
while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &str)) > 0) {
bool good;
if (first && !value)
printf("%s=", name);
/* This property has multiple space-separated values, so
* neither spaces not newlines can be allowed in a value. */
good = str[strcspn(str, " \n")] == '\0';
printf("%s%s", first ? "" : " ", good ? str : "[unprintable]");
first = false;
}
if (r < 0)
return r;
if (first && all && !value)
printf("%s=", name);
if (!first || all)
puts("");
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
return 1;
} else if (streq(contents, "y")) {
const uint8_t *u;
size_t n;
r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
if (r < 0)
return r;
if (all || n > 0) {
unsigned int i;
if (!value)
printf("%s=", name);
for (i = 0; i < n; i++)
printf("%02x", u[i]);
puts("");
}
return 1;
} else if (streq(contents, "u")) {
uint32_t *u;
size_t n;
r = sd_bus_message_read_array(m, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
if (r < 0)
return r;
if (all || n > 0) {
unsigned int i;
if (!value)
printf("%s=", name);
for (i = 0; i < n; i++)
printf("%08x", u[i]);
puts("");
}
return 1;
}
break;
}
return 0;
}
int bus_message_print_all_properties(
sd_bus_message *m,
bus_message_print_t func,
char **filter,
bool value,
bool all,
Set **found_properties) {
int r;
assert(m);
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
if (r < 0)
return r;
while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
const char *name;
const char *contents;
r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &name);
if (r < 0)
return r;
if (found_properties) {
r = set_ensure_allocated(found_properties, &string_hash_ops);
if (r < 0)
return log_oom();
r = set_put(*found_properties, name);
if (r < 0 && r != EEXIST)
return log_oom();
}
if (!filter || strv_find(filter, name)) {
r = sd_bus_message_peek_type(m, NULL, &contents);
if (r < 0)
return r;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
if (r < 0)
return r;
if (func)
r = func(name, m, value, all);
if (!func || r == 0)
r = bus_print_property(name, m, value, all);
if (r < 0)
return r;
if (r == 0) {
if (all)
printf("%s=[unprintable]\n", name);
/* skip what we didn't read */
r = sd_bus_message_skip(m, contents);
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
} else {
r = sd_bus_message_skip(m, "v");
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
}
if (r < 0)
return r;
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
return 0;
}
int bus_print_all_properties(
sd_bus *bus,
const char *dest,
const char *path,
bus_message_print_t func,
char **filter,
bool value,
bool all,
Set **found_properties) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(bus);
assert(path);
r = sd_bus_call_method(bus,
dest,
path,
"org.freedesktop.DBus.Properties",
"GetAll",
&error,
&reply,
"s", "");
if (r < 0)
return r;
return bus_message_print_all_properties(reply, func, filter, value, all, found_properties);
}
int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
sd_id128_t *p = userdata;
const void *v;
size_t n;
int r;
r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
if (r < 0)
return r;
if (n == 0)
*p = SD_ID128_NULL;
else if (n == 16)
memcpy((*p).bytes, v, n);
else
return -EINVAL;
return 0;
}
static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata, bool copy_string) {
char type;
int r;
r = sd_bus_message_peek_type(m, &type, NULL);
if (r < 0)
return r;
switch (type) {
case SD_BUS_TYPE_STRING: {
const char **p = userdata;
const char *s;
r = sd_bus_message_read_basic(m, type, &s);
if (r < 0)
return r;
if (isempty(s))
s = NULL;
if (copy_string)
return free_and_strdup((char **) userdata, s);
*p = s;
return 0;
}
case SD_BUS_TYPE_ARRAY: {
_cleanup_strv_free_ char **l = NULL;
char ***p = userdata;
r = bus_message_read_strv_extend(m, &l);
if (r < 0)
return r;
strv_free(*p);
*p = TAKE_PTR(l);
return 0;
}
case SD_BUS_TYPE_BOOLEAN: {
unsigned b;
bool *p = userdata;
r = sd_bus_message_read_basic(m, type, &b);
if (r < 0)
return r;
*p = !!b;
return 0;
}
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32: {
uint32_t u, *p = userdata;
r = sd_bus_message_read_basic(m, type, &u);
if (r < 0)
return r;
*p = u;
return 0;
}
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64: {
uint64_t t, *p = userdata;
r = sd_bus_message_read_basic(m, type, &t);
if (r < 0)
return r;
*p = t;
return 0;
}
case SD_BUS_TYPE_DOUBLE: {
double d, *p = userdata;
r = sd_bus_message_read_basic(m, type, &d);
if (r < 0)
return r;
*p = d;
return 0;
}}
return -EOPNOTSUPP;
}
int bus_message_map_all_properties(
sd_bus_message *m,
const struct bus_properties_map *map,
bool copy_string,
sd_bus_error *error,
void *userdata) {
int r;
assert(m);
assert(map);
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
if (r < 0)
return r;
while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
const struct bus_properties_map *prop;
const char *member;
const char *contents;
void *v;
unsigned i;
r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
if (r < 0)
return r;
for (i = 0, prop = NULL; map[i].member; i++)
if (streq(map[i].member, member)) {
prop = &map[i];
break;
}
if (prop) {
r = sd_bus_message_peek_type(m, NULL, &contents);
if (r < 0)
return r;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
if (r < 0)
return r;
v = (uint8_t *)userdata + prop->offset;
if (map[i].set)
r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
else
r = map_basic(sd_bus_message_get_bus(m), member, m, error, v, copy_string);
if (r < 0)
return r;
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
} else {
r = sd_bus_message_skip(m, "v");
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
}
if (r < 0)
return r;
return sd_bus_message_exit_container(m);
}
int bus_message_map_properties_changed(
sd_bus_message *m,
const struct bus_properties_map *map,
bool copy_string,
sd_bus_error *error,
void *userdata) {
const char *member;
int r, invalidated, i;
assert(m);
assert(map);
r = bus_message_map_all_properties(m, map, copy_string, error, userdata);
if (r < 0)
return r;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
if (r < 0)
return r;
invalidated = 0;
while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
for (i = 0; map[i].member; i++)
if (streq(map[i].member, member)) {
++invalidated;
break;
}
if (r < 0)
return r;
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
return invalidated;
}
int bus_map_all_properties(
sd_bus *bus,
const char *destination,
const char *path,
const struct bus_properties_map *map,
sd_bus_error *error,
sd_bus_message **reply,
void *userdata) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
int r;
assert(bus);
assert(destination);
assert(path);
assert(map);
r = sd_bus_call_method(
bus,
destination,
path,
"org.freedesktop.DBus.Properties",
"GetAll",
error,
&m,
"s", "");
if (r < 0)
return r;
r = bus_message_map_all_properties(m, map, !reply, error, userdata);
if (r < 0)
return r;
if (reply)
*reply = sd_bus_message_ref(m);
return r;
}
int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
int r;
assert(transport >= 0);
assert(transport < _BUS_TRANSPORT_MAX);
assert(ret);
assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
switch (transport) {
case BUS_TRANSPORT_LOCAL:
if (user)
r = sd_bus_default_user(&bus);
else
r = sd_bus_default_system(&bus);
break;
case BUS_TRANSPORT_REMOTE:
r = sd_bus_open_system_remote(&bus, host);
break;
case BUS_TRANSPORT_MACHINE:
r = sd_bus_open_system_machine(&bus, host);
break;
default:
assert_not_reached("Hmm, unknown transport type.");
}
if (r < 0)
return r;
r = sd_bus_set_exit_on_disconnect(bus, true);
if (r < 0)
return r;
*ret = bus;
bus = NULL;
return 0;
}
int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
int r;
assert(transport >= 0);
assert(transport < _BUS_TRANSPORT_MAX);
assert(bus);
assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
switch (transport) {
case BUS_TRANSPORT_LOCAL:
if (user)
r = bus_connect_user_systemd(bus);
else
r = bus_connect_system_systemd(bus);
break;
case BUS_TRANSPORT_REMOTE:
r = sd_bus_open_system_remote(bus, host);
break;
case BUS_TRANSPORT_MACHINE:
r = sd_bus_open_system_machine(bus, host);
break;
default:
assert_not_reached("Hmm, unknown transport type.");
}
return r;
}
int bus_property_get_bool(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
int b = *(bool*) userdata;
return sd_bus_message_append_basic(reply, 'b', &b);
}
int bus_property_set_bool(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *value,
void *userdata,
sd_bus_error *error) {
int b, r;
r = sd_bus_message_read(value, "b", &b);
if (r < 0)
return r;
*(bool *) userdata = !!b;
return 0;
}
int bus_property_get_id128(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
sd_id128_t *id = userdata;
if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */
return sd_bus_message_append(reply, "ay", 0);
else
return sd_bus_message_append_array(reply, 'y', id->bytes, 16);
}
#if __SIZEOF_SIZE_T__ != 8
int bus_property_get_size(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
uint64_t sz = *(size_t*) userdata;
return sd_bus_message_append_basic(reply, 't', &sz);
}
#endif
#if __SIZEOF_LONG__ != 8
int bus_property_get_long(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
int64_t l = *(long*) userdata;
return sd_bus_message_append_basic(reply, 'x', &l);
}
int bus_property_get_ulong(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
uint64_t ul = *(unsigned long*) userdata;
return sd_bus_message_append_basic(reply, 't', &ul);
}
#endif
int bus_log_parse_error(int r) {
return log_error_errno(r, "Failed to parse bus message: %m");
}
int bus_log_create_error(int r) {
return log_error_errno(r, "Failed to create bus message: %m");
}
/**
* bus_path_encode_unique() - encode unique object path
* @b: bus connection or NULL
* @prefix: object path prefix
* @sender_id: unique-name of client, or NULL
* @external_id: external ID to be chosen by client, or NULL
* @ret_path: storage for encoded object path pointer
*
* Whenever we provide a bus API that allows clients to create and manage
* server-side objects, we need to provide a unique name for these objects. If
* we let the server choose the name, we suffer from a race condition: If a
* client creates an object asynchronously, it cannot destroy that object until
* it received the method reply. It cannot know the name of the new object,
* thus, it cannot destroy it. Furthermore, it enforces a round-trip.
*
* Therefore, many APIs allow the client to choose the unique name for newly
* created objects. There're two problems to solve, though:
* 1) Object names are usually defined via dbus object paths, which are
* usually globally namespaced. Therefore, multiple clients must be able
* to choose unique object names without interference.
* 2) If multiple libraries share the same bus connection, they must be
* able to choose unique object names without interference.
* The first problem is solved easily by prefixing a name with the
* unique-bus-name of a connection. The server side must enforce this and
* reject any other name. The second problem is solved by providing unique
* suffixes from within sd-bus.
*
* This helper allows clients to create unique object-paths. It uses the
* template '/prefix/sender_id/external_id' and returns the new path in
* @ret_path (must be freed by the caller).
* If @sender_id is NULL, the unique-name of @b is used. If @external_id is
* NULL, this function allocates a unique suffix via @b (by requesting a new
* cookie). If both @sender_id and @external_id are given, @b can be passed as
* NULL.
*
* Returns: 0 on success, negative error code on failure.
*/
int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
_cleanup_free_ char *sender_label = NULL, *external_label = NULL;
char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
int r;
assert_return(b || (sender_id && external_id), -EINVAL);
assert_return(object_path_is_valid(prefix), -EINVAL);
assert_return(ret_path, -EINVAL);
if (!sender_id) {
r = sd_bus_get_unique_name(b, &sender_id);
if (r < 0)
return r;
}
if (!external_id) {
xsprintf(external_buf, "%"PRIu64, ++b->cookie);
external_id = external_buf;
}
sender_label = bus_label_escape(sender_id);
if (!sender_label)
return -ENOMEM;
external_label = bus_label_escape(external_id);
if (!external_label)
return -ENOMEM;
p = strjoin(prefix, "/", sender_label, "/", external_label);
if (!p)
return -ENOMEM;
*ret_path = p;
return 0;
}
/**
* bus_path_decode_unique() - decode unique object path
* @path: object path to decode
* @prefix: object path prefix
* @ret_sender: output parameter for sender-id label
* @ret_external: output parameter for external-id label
*
* This does the reverse of bus_path_encode_unique() (see its description for
* details). Both trailing labels, sender-id and external-id, are unescaped and
* returned in the given output parameters (the caller must free them).
*
* Note that this function returns 0 if the path does not match the template
* (see bus_path_encode_unique()), 1 if it matched.
*
* Returns: Negative error code on failure, 0 if the given object path does not
* match the template (return parameters are set to NULL), 1 if it was
* parsed successfully (return parameters contain allocated labels).
*/
int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
const char *p, *q;
char *sender, *external;
assert(object_path_is_valid(path));
assert(object_path_is_valid(prefix));
assert(ret_sender);
assert(ret_external);
p = object_path_startswith(path, prefix);
if (!p) {
*ret_sender = NULL;
*ret_external = NULL;
return 0;
}
q = strchr(p, '/');
if (!q) {
*ret_sender = NULL;
*ret_external = NULL;
return 0;
}
sender = bus_label_unescape_n(p, q - p);
external = bus_label_unescape(q + 1);
if (!sender || !external) {
free(sender);
free(external);
return -ENOMEM;
}
*ret_sender = sender;
*ret_external = external;
return 1;
}
int bus_property_get_rlimit(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
struct rlimit *rl;
uint64_t u;
rlim_t x;
const char *is_soft;
assert(bus);
assert(reply);
assert(userdata);
is_soft = endswith(property, "Soft");
rl = *(struct rlimit**) userdata;
if (rl)
x = is_soft ? rl->rlim_cur : rl->rlim_max;
else {
struct rlimit buf = {};
int z;
const char *s;
s = is_soft ? strndupa(property, is_soft - property) : property;
z = rlimit_from_string(strstr(s, "Limit"));
assert(z >= 0);
getrlimit(z, &buf);
x = is_soft ? buf.rlim_cur : buf.rlim_max;
}
/* rlim_t might have different sizes, let's map
* RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
* all archs */
u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
return sd_bus_message_append(reply, "t", u);
}
int bus_track_add_name_many(sd_bus_track *t, char **l) {
int r = 0;
char **i;
assert(t);
/* Continues adding after failure, and returns the first failure. */
STRV_FOREACH(i, l) {
int k;
k = sd_bus_track_add_name(t, *i);
if (k < 0 && r >= 0)
r = k;
}
return r;
}
int bus_open_system_watch_bind(sd_bus **ret) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
const char *e;
int r;
assert(ret);
/* Match like sd_bus_open_system(), but with the "watch_bind" feature and the Connected() signal turned on. */
r = sd_bus_new(&bus);
if (r < 0)
return r;
e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
if (!e)
e = DEFAULT_SYSTEM_BUS_ADDRESS;
r = sd_bus_set_address(bus, e);
if (r < 0)
return r;
r = sd_bus_set_bus_client(bus, true);
if (r < 0)
return r;
r = sd_bus_set_trusted(bus, true);
if (r < 0)
return r;
r = sd_bus_negotiate_creds(bus, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS);
if (r < 0)
return r;
r = sd_bus_set_watch_bind(bus, true);
if (r < 0)
return r;
r = sd_bus_set_connected_signal(bus, true);
if (r < 0)
return r;
r = sd_bus_start(bus);
if (r < 0)
return r;
*ret = bus;
bus = NULL;
return 0;
}
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