+++ /dev/null
-/*-*- 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/>.
-***/
-
-#include <sys/socket.h>
-
-#include "sd-daemon.h"
-#include "sd-event.h"
-#include "util.h"
-#include "strv.h"
-#include "macro.h"
-#include "def.h"
-#include "path-util.h"
-#include "missing.h"
-#include "set.h"
-#include "signal-util.h"
-#include "unit-name.h"
-
-#include "sd-bus.h"
-#include "bus-error.h"
-#include "bus-label.h"
-#include "bus-message.h"
-#include "bus-util.h"
-#include "bus-internal.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) {
- _cleanup_free_ char *match = NULL;
- 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;
-
- r = asprintf(&match,
- "sender='org.freedesktop.DBus',"
- "type='signal',"
- "interface='org.freedesktop.DBus',"
- "member='NameOwnerChanged',"
- "path='/org/freedesktop/DBus',"
- "arg0='%s',"
- "arg1='%s',"
- "arg2=''", name, unique);
- if (r < 0)
- return -ENOMEM;
-
- r = sd_bus_add_match(bus, NULL, match, name_owner_change_callback, e);
- if (r < 0)
- return r;
-
- r = sd_bus_release_name(bus, name);
- 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_bus_message_unref_ 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_bus_creds_unref_ 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,
- 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;
-#ifdef ENABLE_POLKIT
- else {
- _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
- int authorized = false, challenge = false;
- const char *sender;
-
- sender = sd_bus_message_get_sender(call);
- if (!sender)
- return -EBADMSG;
-
- r = sd_bus_call_method(
- call->bus,
- "org.freedesktop.PolicyKit1",
- "/org/freedesktop/PolicyKit1/Authority",
- "org.freedesktop.PolicyKit1.Authority",
- "CheckAuthorization",
- e,
- &reply,
- "(sa{sv})sa{ss}us",
- "system-bus-name", 1, "name", "s", sender,
- action,
- 0,
- 0,
- "");
-
- 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;
-}
-
-#ifdef 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_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,
- bool interactive,
- uid_t good_user,
- Hashmap **registry,
- sd_bus_error *error) {
-
-#ifdef ENABLE_POLKIT
- _cleanup_bus_message_unref_ sd_bus_message *pk = NULL;
- AsyncPolkitQuery *q;
- const char *sender;
- 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;
-
-#ifdef 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;
-
-#ifdef 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})sa{ss}us",
- "system-bus-name", 1, "name", "s", sender,
- action,
- 0,
- !!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) {
-#ifdef ENABLE_POLKIT
- AsyncPolkitQuery *q;
-
- while ((q = hashmap_steal_first(registry)))
- async_polkit_query_free(q);
-
- hashmap_free(registry);
-#endif
-}
-
-int bus_check_peercred(sd_bus *c) {
- struct ucred ucred;
- socklen_t l;
- int fd;
-
- assert(c);
-
- fd = sd_bus_get_fd(c);
- if (fd < 0)
- return fd;
-
- l = sizeof(struct ucred);
- if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
- return -errno;
-
- if (l != sizeof(struct ucred))
- return -E2BIG;
-
- if (ucred.uid != 0 && ucred.uid != geteuid())
- return -EPERM;
-
- return 1;
-}
-
-int bus_open_system_systemd(sd_bus **_bus) {
- _cleanup_bus_unref_ sd_bus *bus = NULL;
- int r;
-
- assert(_bus);
-
- if (geteuid() != 0)
- return sd_bus_open_system(_bus);
-
- /* If we are root and kdbus is not available, 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, KERNEL_SYSTEM_BUS_ADDRESS);
- if (r < 0)
- return r;
-
- bus->bus_client = true;
-
- r = sd_bus_start(bus);
- if (r >= 0) {
- *_bus = bus;
- bus = NULL;
- return 0;
- }
-
- bus = sd_bus_unref(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_open_system(_bus);
-
- r = bus_check_peercred(bus);
- if (r < 0)
- return r;
-
- *_bus = bus;
- bus = NULL;
-
- return 0;
-}
-
-int bus_open_user_systemd(sd_bus **_bus) {
- _cleanup_bus_unref_ sd_bus *bus = NULL;
- _cleanup_free_ char *ee = NULL;
- const char *e;
- int r;
-
- /* Try via kdbus first, and then directly */
-
- assert(_bus);
-
- r = sd_bus_new(&bus);
- if (r < 0)
- return r;
-
- if (asprintf(&bus->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid()) < 0)
- return -ENOMEM;
-
- bus->bus_client = true;
-
- r = sd_bus_start(bus);
- if (r >= 0) {
- *_bus = bus;
- bus = NULL;
- return 0;
- }
-
- bus = sd_bus_unref(bus);
-
- e = secure_getenv("XDG_RUNTIME_DIR");
- if (!e)
- return sd_bus_open_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", NULL);
- if (!bus->address)
- return -ENOMEM;
-
- r = sd_bus_start(bus);
- if (r < 0)
- return sd_bus_open_user(_bus);
-
- r = bus_check_peercred(bus);
- if (r < 0)
- return r;
-
- *_bus = bus;
- bus = NULL;
-
- return 0;
-}
-
-int bus_print_property(const char *name, sd_bus_message *property, bool all) {
- char type;
- const char *contents;
- int r;
-
- assert(name);
- assert(property);
-
- r = sd_bus_message_peek_type(property, &type, &contents);
- if (r < 0)
- return r;
-
- switch (type) {
-
- case SD_BUS_TYPE_STRING: {
- const char *s;
-
- r = sd_bus_message_read_basic(property, type, &s);
- if (r < 0)
- return r;
-
- if (all || !isempty(s)) {
- _cleanup_free_ char *escaped = NULL;
-
- escaped = xescape(s, "\n");
- if (!escaped)
- return -ENOMEM;
-
- printf("%s=%s\n", name, escaped);
- }
-
- return 1;
- }
-
- case SD_BUS_TYPE_BOOLEAN: {
- int b;
-
- r = sd_bus_message_read_basic(property, type, &b);
- if (r < 0)
- return r;
-
- printf("%s=%s\n", name, yes_no(b));
-
- return 1;
- }
-
- case SD_BUS_TYPE_UINT64: {
- uint64_t u;
-
- r = sd_bus_message_read_basic(property, 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")) {
- char timestamp[FORMAT_TIMESTAMP_MAX], *t;
-
- t = format_timestamp(timestamp, sizeof(timestamp), u);
- if (t || all)
- printf("%s=%s\n", name, strempty(t));
-
- } else if (strstr(name, "USec")) {
- char timespan[FORMAT_TIMESPAN_MAX];
-
- printf("%s=%s\n", name, format_timespan(timespan, sizeof(timespan), u, 0));
- } else
- printf("%s=%llu\n", name, (unsigned long long) u);
-
- return 1;
- }
-
- case SD_BUS_TYPE_INT64: {
- int64_t i;
-
- r = sd_bus_message_read_basic(property, type, &i);
- if (r < 0)
- return r;
-
- printf("%s=%lld\n", name, (long long) i);
-
- return 1;
- }
-
- case SD_BUS_TYPE_UINT32: {
- uint32_t u;
-
- r = sd_bus_message_read_basic(property, type, &u);
- if (r < 0)
- return r;
-
- if (strstr(name, "UMask") || strstr(name, "Mode"))
- printf("%s=%04o\n", name, u);
- else
- printf("%s=%u\n", name, (unsigned) u);
-
- return 1;
- }
-
- case SD_BUS_TYPE_INT32: {
- int32_t i;
-
- r = sd_bus_message_read_basic(property, type, &i);
- if (r < 0)
- return r;
-
- printf("%s=%i\n", name, (int) i);
- return 1;
- }
-
- case SD_BUS_TYPE_DOUBLE: {
- double d;
-
- r = sd_bus_message_read_basic(property, type, &d);
- if (r < 0)
- return r;
-
- printf("%s=%g\n", name, d);
- return 1;
- }
-
- case SD_BUS_TYPE_ARRAY:
- if (streq(contents, "s")) {
- bool first = true;
- const char *str;
-
- r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
- if (r < 0)
- return r;
-
- while((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
- _cleanup_free_ char *escaped = NULL;
-
- if (first)
- printf("%s=", name);
-
- escaped = xescape(str, "\n ");
- if (!escaped)
- return -ENOMEM;
-
- printf("%s%s", first ? "" : " ", escaped);
-
- first = false;
- }
- if (r < 0)
- return r;
-
- if (first && all)
- printf("%s=", name);
- if (!first || all)
- puts("");
-
- r = sd_bus_message_exit_container(property);
- 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(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
- if (r < 0)
- return r;
-
- if (all || n > 0) {
- unsigned int i;
-
- 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(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
- if (r < 0)
- return r;
-
- if (all || n > 0) {
- unsigned int i;
-
- printf("%s=", name);
-
- for (i = 0; i < n; i++)
- printf("%08x", u[i]);
-
- puts("");
- }
-
- return 1;
- }
-
- break;
- }
-
- return 0;
-}
-
-int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all) {
- _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
- _cleanup_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;
-
- r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
- if (r < 0)
- return r;
-
- while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
- const char *name;
- const char *contents;
-
- r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
- if (r < 0)
- return r;
-
- if (!filter || strv_find(filter, name)) {
- r = sd_bus_message_peek_type(reply, NULL, &contents);
- if (r < 0)
- return r;
-
- r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
- if (r < 0)
- return r;
-
- r = bus_print_property(name, reply, 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(reply, contents);
- if (r < 0)
- return r;
- }
-
- r = sd_bus_message_exit_container(reply);
- if (r < 0)
- return r;
- } else {
- r = sd_bus_message_skip(reply, "v");
- if (r < 0)
- return r;
- }
-
- r = sd_bus_message_exit_container(reply);
- if (r < 0)
- return r;
- }
- if (r < 0)
- return r;
-
- r = sd_bus_message_exit_container(reply);
- if (r < 0)
- return r;
-
- return 0;
-}
-
-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) {
- 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 *s;
- char **p = userdata;
-
- r = sd_bus_message_read_basic(m, type, &s);
- if (r < 0)
- break;
-
- if (isempty(s))
- break;
-
- r = free_and_strdup(p, s);
- break;
- }
-
- 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)
- break;
-
- strv_free(*p);
- *p = l;
- l = NULL;
-
- break;
- }
-
- case SD_BUS_TYPE_BOOLEAN: {
- unsigned b;
- bool *p = userdata;
-
- r = sd_bus_message_read_basic(m, type, &b);
- if (r < 0)
- break;
-
- *p = b;
-
- break;
- }
-
- case SD_BUS_TYPE_UINT32: {
- uint64_t u;
- uint32_t *p = userdata;
-
- r = sd_bus_message_read_basic(m, type, &u);
- if (r < 0)
- break;
-
- *p = u;
-
- break;
- }
-
- case SD_BUS_TYPE_UINT64: {
- uint64_t t;
- uint64_t *p = userdata;
-
- r = sd_bus_message_read_basic(m, type, &t);
- if (r < 0)
- break;
-
- *p = t;
-
- break;
- }
-
- default:
- break;
- }
-
- return r;
-}
-
-int bus_message_map_all_properties(
- sd_bus_message *m,
- const struct bus_properties_map *map,
- void *userdata) {
-
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- 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);
- 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,
- void *userdata) {
-
- const char *member;
- int r, invalidated, i;
-
- assert(m);
- assert(map);
-
- r = bus_message_map_all_properties(m, map, 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,
- void *userdata) {
-
- _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_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;
-
- return bus_message_map_all_properties(m, map, userdata);
-}
-
-int bus_open_transport(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 = 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.");
- }
-
- return r;
-}
-
-int bus_open_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_open_user_systemd(bus);
- else
- r = bus_open_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);
-}
-
-#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");
-}
-
-int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) {
- assert(message);
- assert(u);
-
- u->machine = NULL;
-
- return sd_bus_message_read(
- message,
- "(ssssssouso)",
- &u->id,
- &u->description,
- &u->load_state,
- &u->active_state,
- &u->sub_state,
- &u->following,
- &u->unit_path,
- &u->job_id,
- &u->job_type,
- &u->job_path);
-}
-
-int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error) {
- assert(m);
-
- if (r < 0) {
- if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
- sd_bus_reply_method_errno(m, r, error);
-
- } else if (sd_bus_error_is_set(error)) {
- if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
- sd_bus_reply_method_error(m, error);
- } else
- return r;
-
- log_debug("Failed to process message [type=%s sender=%s path=%s interface=%s member=%s signature=%s]: %s",
- bus_message_type_to_string(m->header->type),
- strna(m->sender),
- strna(m->path),
- strna(m->interface),
- strna(m->member),
- strna(m->root_container.signature),
- bus_error_message(error, r));
-
- return 1;
-}
-
-int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignment) {
- const char *eq, *field;
- int r;
-
- assert(m);
- assert(assignment);
-
- eq = strchr(assignment, '=');
- if (!eq) {
- log_error("Not an assignment: %s", assignment);
- return -EINVAL;
- }
-
- field = strndupa(assignment, eq - assignment);
- eq ++;
-
- if (streq(field, "CPUQuota")) {
-
- if (isempty(eq)) {
-
- r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "CPUQuotaPerSecUSec");
- if (r < 0)
- return bus_log_create_error(r);
-
- r = sd_bus_message_append(m, "v", "t", USEC_INFINITY);
-
- } else if (endswith(eq, "%")) {
- double percent;
-
- if (sscanf(eq, "%lf%%", &percent) != 1 || percent <= 0) {
- log_error("CPU quota '%s' invalid.", eq);
- return -EINVAL;
- }
-
- r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "CPUQuotaPerSecUSec");
- if (r < 0)
- return bus_log_create_error(r);
-
- r = sd_bus_message_append(m, "v", "t", (usec_t) percent * USEC_PER_SEC / 100);
- } else {
- log_error("CPU quota needs to be in percent.");
- return -EINVAL;
- }
-
- if (r < 0)
- return bus_log_create_error(r);
-
- return 0;
- }
-
- r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field);
- if (r < 0)
- return bus_log_create_error(r);
-
- if (STR_IN_SET(field,
- "CPUAccounting", "MemoryAccounting", "BlockIOAccounting",
- "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies")) {
-
- r = parse_boolean(eq);
- if (r < 0) {
- log_error("Failed to parse boolean assignment %s.", assignment);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "b", r);
-
- } else if (streq(field, "MemoryLimit")) {
- off_t bytes;
-
- r = parse_size(eq, 1024, &bytes);
- if (r < 0) {
- log_error("Failed to parse bytes specification %s", assignment);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "t", (uint64_t) bytes);
-
- } else if (STR_IN_SET(field, "CPUShares", "BlockIOWeight")) {
- uint64_t u;
-
- r = safe_atou64(eq, &u);
- if (r < 0) {
- log_error("Failed to parse %s value %s.", field, eq);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "t", u);
-
- } else if (STR_IN_SET(field, "User", "Group", "DevicePolicy", "KillMode"))
- r = sd_bus_message_append(m, "v", "s", eq);
-
- else if (streq(field, "DeviceAllow")) {
-
- if (isempty(eq))
- r = sd_bus_message_append(m, "v", "a(ss)", 0);
- else {
- const char *path, *rwm, *e;
-
- e = strchr(eq, ' ');
- if (e) {
- path = strndupa(eq, e - eq);
- rwm = e+1;
- } else {
- path = eq;
- rwm = "";
- }
-
- if (!path_startswith(path, "/dev")) {
- log_error("%s is not a device file in /dev.", path);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "a(ss)", 1, path, rwm);
- }
-
- } else if (STR_IN_SET(field, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) {
-
- if (isempty(eq))
- r = sd_bus_message_append(m, "v", "a(st)", 0);
- else {
- const char *path, *bandwidth, *e;
- off_t bytes;
-
- e = strchr(eq, ' ');
- if (e) {
- path = strndupa(eq, e - eq);
- bandwidth = e+1;
- } else {
- log_error("Failed to parse %s value %s.", field, eq);
- return -EINVAL;
- }
-
- if (!path_startswith(path, "/dev")) {
- log_error("%s is not a device file in /dev.", path);
- return -EINVAL;
- }
-
- r = parse_size(bandwidth, 1000, &bytes);
- if (r < 0) {
- log_error("Failed to parse byte value %s.", bandwidth);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "a(st)", 1, path, (uint64_t) bytes);
- }
-
- } else if (streq(field, "BlockIODeviceWeight")) {
-
- if (isempty(eq))
- r = sd_bus_message_append(m, "v", "a(st)", 0);
- else {
- const char *path, *weight, *e;
- uint64_t u;
-
- e = strchr(eq, ' ');
- if (e) {
- path = strndupa(eq, e - eq);
- weight = e+1;
- } else {
- log_error("Failed to parse %s value %s.", field, eq);
- return -EINVAL;
- }
-
- if (!path_startswith(path, "/dev")) {
- log_error("%s is not a device file in /dev.", path);
- return -EINVAL;
- }
-
- r = safe_atou64(weight, &u);
- if (r < 0) {
- log_error("Failed to parse %s value %s.", field, weight);
- return -EINVAL;
- }
- r = sd_bus_message_append(m, "v", "a(st)", path, u);
- }
-
- } else if (rlimit_from_string(field) >= 0) {
- uint64_t rl;
-
- if (streq(eq, "infinity"))
- rl = (uint64_t) -1;
- else {
- r = safe_atou64(eq, &rl);
- if (r < 0) {
- log_error("Invalid resource limit: %s", eq);
- return -EINVAL;
- }
- }
-
- r = sd_bus_message_append(m, "v", "t", rl);
-
- } else if (streq(field, "Nice")) {
- int32_t i;
-
- r = safe_atoi32(eq, &i);
- if (r < 0) {
- log_error("Failed to parse %s value %s.", field, eq);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "i", i);
-
- } else if (streq(field, "Environment")) {
-
- r = sd_bus_message_append(m, "v", "as", 1, eq);
-
- } else if (streq(field, "KillSignal")) {
- int sig;
-
- sig = signal_from_string_try_harder(eq);
- if (sig < 0) {
- log_error("Failed to parse %s value %s.", field, eq);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "i", sig);
-
- } else if (streq(field, "AccuracySec")) {
- usec_t u;
-
- r = parse_sec(eq, &u);
- if (r < 0) {
- log_error("Failed to parse %s value %s", field, eq);
- return -EINVAL;
- }
-
- r = sd_bus_message_append(m, "v", "t", u);
-
- } else {
- log_error("Unknown assignment %s.", assignment);
- return -EINVAL;
- }
-
- if (r < 0)
- return bus_log_create_error(r);
-
- return 0;
-}
-
-typedef struct BusWaitForJobs {
- sd_bus *bus;
- Set *jobs;
-
- char *name;
- char *result;
-
- sd_bus_slot *slot_job_removed;
- sd_bus_slot *slot_disconnected;
-} BusWaitForJobs;
-
-static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
- assert(m);
-
- log_error("Warning! D-Bus connection terminated.");
- sd_bus_close(sd_bus_message_get_bus(m));
-
- return 0;
-}
-
-static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
- const char *path, *unit, *result;
- BusWaitForJobs *d = userdata;
- uint32_t id;
- char *found;
- int r;
-
- assert(m);
- assert(d);
-
- r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
- if (r < 0) {
- bus_log_parse_error(r);
- return 0;
- }
-
- found = set_remove(d->jobs, (char*) path);
- if (!found)
- return 0;
-
- free(found);
-
- if (!isempty(result))
- d->result = strdup(result);
-
- if (!isempty(unit))
- d->name = strdup(unit);
-
- return 0;
-}
-
-void bus_wait_for_jobs_free(BusWaitForJobs *d) {
- if (!d)
- return;
-
- set_free_free(d->jobs);
-
- sd_bus_slot_unref(d->slot_disconnected);
- sd_bus_slot_unref(d->slot_job_removed);
-
- sd_bus_unref(d->bus);
-
- free(d->name);
- free(d->result);
-
- free(d);
-}
-
-int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
- _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
- int r;
-
- assert(bus);
- assert(ret);
-
- d = new0(BusWaitForJobs, 1);
- if (!d)
- return -ENOMEM;
-
- d->bus = sd_bus_ref(bus);
-
- /* When we are a bus client we match by sender. Direct
- * connections OTOH have no initialized sender field, and
- * hence we ignore the sender then */
- r = sd_bus_add_match(
- bus,
- &d->slot_job_removed,
- bus->bus_client ?
- "type='signal',"
- "sender='org.freedesktop.systemd1',"
- "interface='org.freedesktop.systemd1.Manager',"
- "member='JobRemoved',"
- "path='/org/freedesktop/systemd1'" :
- "type='signal',"
- "interface='org.freedesktop.systemd1.Manager',"
- "member='JobRemoved',"
- "path='/org/freedesktop/systemd1'",
- match_job_removed, d);
- if (r < 0)
- return r;
-
- r = sd_bus_add_match(
- bus,
- &d->slot_disconnected,
- "type='signal',"
- "sender='org.freedesktop.DBus.Local',"
- "interface='org.freedesktop.DBus.Local',"
- "member='Disconnected'",
- match_disconnected, d);
- if (r < 0)
- return r;
-
- *ret = d;
- d = NULL;
-
- return 0;
-}
-
-static int bus_process_wait(sd_bus *bus) {
- int r;
-
- for (;;) {
- r = sd_bus_process(bus, NULL);
- if (r < 0)
- return r;
- if (r > 0)
- return 0;
-
- r = sd_bus_wait(bus, (uint64_t) -1);
- if (r < 0)
- return r;
- }
-}
-
-static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
- _cleanup_free_ char *dbus_path = NULL;
-
- assert(d);
- assert(d->name);
- assert(result);
-
- dbus_path = unit_dbus_path_from_name(d->name);
- if (!dbus_path)
- return -ENOMEM;
-
- return sd_bus_get_property_string(d->bus,
- "org.freedesktop.systemd1",
- dbus_path,
- "org.freedesktop.systemd1.Service",
- "Result",
- NULL,
- result);
-}
-
-static const struct {
- const char *result, *explanation;
-} explanations [] = {
- { "resources", "a configured resource limit was exceeded" },
- { "timeout", "a timeout was exceeded" },
- { "exit-code", "the control process exited with error code" },
- { "signal", "a fatal signal was delivered to the control process" },
- { "core-dump", "a fatal signal was delivered causing the control process to dump core" },
- { "watchdog", "the service failed to send watchdog ping" },
- { "start-limit", "start of the service was attempted too often" }
-};
-
-static void log_job_error_with_service_result(const char* service, const char *result) {
- _cleanup_free_ char *service_shell_quoted = NULL;
-
- assert(service);
-
- service_shell_quoted = shell_maybe_quote(service);
-
- if (!isempty(result)) {
- unsigned i;
-
- for (i = 0; i < ELEMENTSOF(explanations); ++i)
- if (streq(result, explanations[i].result))
- break;
-
- if (i < ELEMENTSOF(explanations)) {
- log_error("Job for %s failed because %s. See \"systemctl status %s\" and \"journalctl -xe\" for details.\n",
- service,
- explanations[i].explanation,
- strna(service_shell_quoted));
-
- goto finish;
- }
- }
-
- log_error("Job for %s failed. See \"systemctl status %s\" and \"journalctl -xe\" for details.\n",
- service,
- strna(service_shell_quoted));
-
-finish:
- /* For some results maybe additional explanation is required */
- if (streq_ptr(result, "start-limit"))
- log_info("To force a start use \"systemctl reset-failed %1$s\" followed by \"systemctl start %1$s\" again.",
- strna(service_shell_quoted));
-}
-
-static int check_wait_response(BusWaitForJobs *d, bool quiet) {
- int r = 0;
-
- assert(d->result);
-
- if (!quiet) {
- if (streq(d->result, "canceled"))
- log_error("Job for %s canceled.", strna(d->name));
- else if (streq(d->result, "timeout"))
- log_error("Job for %s timed out.", strna(d->name));
- else if (streq(d->result, "dependency"))
- log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
- else if (streq(d->result, "invalid"))
- log_error("Job for %s invalid.", strna(d->name));
- else if (streq(d->result, "assert"))
- log_error("Assertion failed on job for %s.", strna(d->name));
- else if (streq(d->result, "unsupported"))
- log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
- else if (!streq(d->result, "done") && !streq(d->result, "skipped")) {
- if (d->name) {
- int q;
- _cleanup_free_ char *result = NULL;
-
- q = bus_job_get_service_result(d, &result);
- if (q < 0)
- log_debug_errno(q, "Failed to get Result property of service %s: %m", d->name);
-
- log_job_error_with_service_result(d->name, result);
- } else
- log_error("Job failed. See \"journalctl -xe\" for details.");
- }
- }
-
- if (streq(d->result, "canceled"))
- r = -ECANCELED;
- else if (streq(d->result, "timeout"))
- r = -ETIME;
- else if (streq(d->result, "dependency"))
- r = -EIO;
- else if (streq(d->result, "invalid"))
- r = -ENOEXEC;
- else if (streq(d->result, "assert"))
- r = -EPROTO;
- else if (streq(d->result, "unsupported"))
- r = -EOPNOTSUPP;
- else if (!streq(d->result, "done") && !streq(d->result, "skipped"))
- r = -EIO;
-
- return r;
-}
-
-int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet) {
- int r = 0;
-
- assert(d);
-
- while (!set_isempty(d->jobs)) {
- int q;
-
- q = bus_process_wait(d->bus);
- if (q < 0)
- return log_error_errno(q, "Failed to wait for response: %m");
-
- if (d->result) {
- q = check_wait_response(d, quiet);
- /* Return the first error as it is most likely to be
- * meaningful. */
- if (q < 0 && r == 0)
- r = q;
-
- log_debug_errno(q, "Got result %s/%m for job %s", strna(d->result), strna(d->name));
- }
-
- free(d->name);
- d->name = NULL;
-
- free(d->result);
- d->result = NULL;
- }
-
- return r;
-}
-
-int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
- int r;
-
- assert(d);
-
- r = set_ensure_allocated(&d->jobs, &string_hash_ops);
- if (r < 0)
- return r;
-
- return set_put_strdup(d->jobs, path);
-}
-
-int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) {
- const char *type, *path, *source;
- int r;
-
- r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(sss)");
- if (r < 0)
- return bus_log_parse_error(r);
-
- while ((r = sd_bus_message_read(m, "(sss)", &type, &path, &source)) > 0) {
- if (!quiet) {
- if (streq(type, "symlink"))
- log_info("Created symlink from %s to %s.", path, source);
- else
- log_info("Removed symlink %s.", path);
- }
-
- r = unit_file_changes_add(changes, n_changes, streq(type, "symlink") ? UNIT_FILE_SYMLINK : UNIT_FILE_UNLINK, path, source);
- if (r < 0)
- return r;
- }
- if (r < 0)
- return bus_log_parse_error(r);
-
- r = sd_bus_message_exit_container(m);
- if (r < 0)
- return bus_log_parse_error(r);
-
- return 0;
-}
-
-/**
- * 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, NULL);
- 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;
-}
-
-bool is_kdbus_wanted(void) {
- _cleanup_free_ char *value = NULL;
-#ifdef ENABLE_KDBUS
- const bool configured = true;
-#else
- const bool configured = false;
-#endif
-
- int r;
-
- if (get_proc_cmdline_key("kdbus", NULL) > 0)
- return true;
-
- r = get_proc_cmdline_key("kdbus=", &value);
- if (r <= 0)
- return configured;
-
- return parse_boolean(value) == 1;
-}
-
-bool is_kdbus_available(void) {
- _cleanup_close_ int fd = -1;
- struct kdbus_cmd cmd = { .size = sizeof(cmd), .flags = KDBUS_FLAG_NEGOTIATE };
-
- if (!is_kdbus_wanted())
- return false;
-
- fd = open("/sys/fs/kdbus/control", O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
- if (fd < 0)
- return false;
-
- return ioctl(fd, KDBUS_CMD_BUS_MAKE, &cmd) >= 0;
-}
~ianmdlvl / elogind.git / blobdiff