1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #ifdef HAVE_VALGRIND_MEMCHECK_H
23 #include <valgrind/memcheck.h>
31 #include "bus-internal.h"
32 #include "bus-message.h"
33 #include "bus-control.h"
34 #include "bus-bloom.h"
36 #include "cgroup-util.h"
38 _public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
41 assert_return(bus, -EINVAL);
42 assert_return(unique, -EINVAL);
43 assert_return(!bus_pid_changed(bus), -ECHILD);
45 r = bus_ensure_running(bus);
49 *unique = bus->unique_name;
53 static int bus_request_name_kernel(sd_bus *bus, const char *name, uint64_t flags) {
54 struct kdbus_cmd_name *n;
62 size = offsetof(struct kdbus_cmd_name, items) + KDBUS_ITEM_SIZE(l);
63 n = alloca0_align(size, 8);
65 kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags);
67 n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
68 n->items[0].type = KDBUS_ITEM_NAME;
69 memcpy(n->items[0].str, name, l);
71 #ifdef HAVE_VALGRIND_MEMCHECK_H
72 VALGRIND_MAKE_MEM_DEFINED(n, n->size);
75 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
79 if (n->flags & KDBUS_NAME_IN_QUEUE)
85 static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
86 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
87 uint32_t ret, param = 0;
93 if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
94 param |= BUS_NAME_ALLOW_REPLACEMENT;
95 if (flags & SD_BUS_NAME_REPLACE_EXISTING)
96 param |= BUS_NAME_REPLACE_EXISTING;
97 if (!(flags & SD_BUS_NAME_QUEUE))
98 param |= BUS_NAME_DO_NOT_QUEUE;
100 r = sd_bus_call_method(
102 "org.freedesktop.DBus",
103 "/org/freedesktop/DBus",
104 "org.freedesktop.DBus",
114 r = sd_bus_message_read(reply, "u", &ret);
118 if (ret == BUS_NAME_ALREADY_OWNER)
120 else if (ret == BUS_NAME_EXISTS)
122 else if (ret == BUS_NAME_IN_QUEUE)
124 else if (ret == BUS_NAME_PRIMARY_OWNER)
130 _public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
131 assert_return(bus, -EINVAL);
132 assert_return(name, -EINVAL);
133 assert_return(bus->bus_client, -EINVAL);
134 assert_return(!bus_pid_changed(bus), -ECHILD);
135 assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
136 assert_return(service_name_is_valid(name), -EINVAL);
137 assert_return(name[0] != ':', -EINVAL);
139 if (!BUS_IS_OPEN(bus->state))
143 return bus_request_name_kernel(bus, name, flags);
145 return bus_request_name_dbus1(bus, name, flags);
148 static int bus_release_name_kernel(sd_bus *bus, const char *name) {
149 struct kdbus_cmd_name *n;
156 l = strlen(name) + 1;
157 size = offsetof(struct kdbus_cmd_name, items) + KDBUS_ITEM_SIZE(l);
158 n = alloca0_align(size, 8);
161 n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
162 n->items[0].type = KDBUS_ITEM_NAME;
163 memcpy(n->items[0].str, name, l);
165 #ifdef HAVE_VALGRIND_MEMCHECK_H
166 VALGRIND_MAKE_MEM_DEFINED(n, n->size);
168 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
175 static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
176 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
183 r = sd_bus_call_method(
185 "org.freedesktop.DBus",
186 "/org/freedesktop/DBus",
187 "org.freedesktop.DBus",
196 r = sd_bus_message_read(reply, "u", &ret);
199 if (ret == BUS_NAME_NON_EXISTENT)
201 if (ret == BUS_NAME_NOT_OWNER)
203 if (ret == BUS_NAME_RELEASED)
209 _public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
210 assert_return(bus, -EINVAL);
211 assert_return(name, -EINVAL);
212 assert_return(bus->bus_client, -EINVAL);
213 assert_return(!bus_pid_changed(bus), -ECHILD);
214 assert_return(service_name_is_valid(name), -EINVAL);
215 assert_return(name[0] != ':', -EINVAL);
217 if (!BUS_IS_OPEN(bus->state))
221 return bus_release_name_kernel(bus, name);
223 return bus_release_name_dbus1(bus, name);
226 static int kernel_cmd_free(sd_bus *bus, uint64_t offset)
228 struct kdbus_cmd_free cmd;
236 r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
243 static int kernel_get_list(sd_bus *bus, uint64_t flags, char ***x) {
244 struct kdbus_cmd_name_list cmd = {};
245 struct kdbus_name_list *name_list;
246 struct kdbus_name_info *name;
247 uint64_t previous_id = 0;
250 /* Caller will free half-constructed list on failure... */
254 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
258 name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
260 KDBUS_ITEM_FOREACH(name, name_list, names) {
262 struct kdbus_item *item;
263 const char *entry_name = NULL;
265 if ((flags & KDBUS_NAME_LIST_UNIQUE) && name->owner_id != previous_id) {
268 if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) {
273 r = strv_consume(x, n);
277 previous_id = name->owner_id;
280 KDBUS_ITEM_FOREACH(item, name, items)
281 if (item->type == KDBUS_ITEM_OWNED_NAME)
282 entry_name = item->name.name;
284 if (entry_name && service_name_is_valid(entry_name)) {
285 r = strv_extend(x, entry_name);
296 kernel_cmd_free(bus, cmd.offset);
300 static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) {
301 _cleanup_strv_free_ char **x = NULL, **y = NULL;
305 r = kernel_get_list(bus, KDBUS_NAME_LIST_UNIQUE | KDBUS_NAME_LIST_NAMES, &x);
311 r = kernel_get_list(bus, KDBUS_NAME_LIST_ACTIVATORS, &y);
327 static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
328 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
329 _cleanup_strv_free_ char **x = NULL, **y = NULL;
333 r = sd_bus_call_method(
335 "org.freedesktop.DBus",
336 "/org/freedesktop/DBus",
337 "org.freedesktop.DBus",
345 r = sd_bus_message_read_strv(reply, &x);
349 reply = sd_bus_message_unref(reply);
353 r = sd_bus_call_method(
355 "org.freedesktop.DBus",
356 "/org/freedesktop/DBus",
357 "org.freedesktop.DBus",
358 "ListActivatableNames",
365 r = sd_bus_message_read_strv(reply, &y);
381 _public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
382 assert_return(bus, -EINVAL);
383 assert_return(acquired || activatable, -EINVAL);
384 assert_return(!bus_pid_changed(bus), -ECHILD);
386 if (!BUS_IS_OPEN(bus->state))
390 return bus_list_names_kernel(bus, acquired, activatable);
392 return bus_list_names_dbus1(bus, acquired, activatable);
395 static int bus_populate_creds_from_items(sd_bus *bus,
396 struct kdbus_info *info,
400 struct kdbus_item *item;
404 KDBUS_ITEM_FOREACH(item, info, items) {
406 switch (item->type) {
408 case KDBUS_ITEM_CREDS:
409 m = (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID | SD_BUS_CREDS_PID) & mask;
412 c->uid = (uid_t) item->creds.uid;
413 c->pid = (pid_t) item->creds.pid;
414 c->gid = (gid_t) item->creds.gid;
418 if (mask & SD_BUS_CREDS_TID && item->creds.tid > 0) {
419 c->tid = (pid_t) item->creds.tid;
420 c->mask |= SD_BUS_CREDS_TID;
423 if (mask & SD_BUS_CREDS_PID_STARTTIME && item->creds.starttime > 0) {
424 c->pid_starttime = item->creds.starttime;
425 c->mask |= SD_BUS_CREDS_PID_STARTTIME;
430 case KDBUS_ITEM_PID_COMM:
431 if (mask & SD_BUS_CREDS_COMM) {
432 c->comm = strdup(item->str);
436 c->mask |= SD_BUS_CREDS_COMM;
440 case KDBUS_ITEM_TID_COMM:
441 if (mask & SD_BUS_CREDS_TID_COMM) {
442 c->tid_comm = strdup(item->str);
446 c->mask |= SD_BUS_CREDS_TID_COMM;
451 if (mask & SD_BUS_CREDS_EXE) {
452 c->exe = strdup(item->str);
456 c->mask |= SD_BUS_CREDS_EXE;
460 case KDBUS_ITEM_CMDLINE:
461 if (mask & SD_BUS_CREDS_CMDLINE) {
462 c->cmdline_size = item->size - KDBUS_ITEM_HEADER_SIZE;
463 c->cmdline = memdup(item->data, c->cmdline_size);
467 c->mask |= SD_BUS_CREDS_CMDLINE;
471 case KDBUS_ITEM_CGROUP:
472 m = (SD_BUS_CREDS_CGROUP | SD_BUS_CREDS_UNIT |
473 SD_BUS_CREDS_USER_UNIT | SD_BUS_CREDS_SLICE |
474 SD_BUS_CREDS_SESSION | SD_BUS_CREDS_OWNER_UID) & mask;
477 c->cgroup = strdup(item->str);
481 r = bus_get_root_path(bus);
485 c->cgroup_root = strdup(bus->cgroup_root);
493 case KDBUS_ITEM_CAPS:
494 m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS |
495 SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask;
498 c->capability_size = item->size - offsetof(struct kdbus_item, caps.caps);
499 c->capability = memdup(item->caps.caps, c->capability_size);
507 case KDBUS_ITEM_SECLABEL:
508 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
509 c->label = strdup(item->str);
513 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
517 case KDBUS_ITEM_AUDIT:
518 m = (SD_BUS_CREDS_AUDIT_SESSION_ID | SD_BUS_CREDS_AUDIT_LOGIN_UID) & mask;
521 c->audit_session_id = item->audit.sessionid;
522 c->audit_login_uid = item->audit.loginuid;
527 case KDBUS_ITEM_OWNED_NAME:
528 if ((mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) && service_name_is_valid(item->name.name)) {
529 r = strv_extend(&c->well_known_names, item->name.name);
533 c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
537 case KDBUS_ITEM_CONN_DESCRIPTION:
538 if ((mask & SD_BUS_CREDS_DESCRIPTION)) {
539 c->description = strdup(item->str);
543 c->mask |= SD_BUS_CREDS_DESCRIPTION;
552 static int bus_get_name_creds_kdbus(
556 sd_bus_creds **creds) {
558 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
559 struct kdbus_cmd_info *cmd;
560 struct kdbus_info *conn_info;
565 r = bus_kernel_parse_unique_name(name, &id);
569 size = offsetof(struct kdbus_cmd_info, items);
570 cmd = alloca0_align(size, 8);
573 l = strlen(name) + 1;
574 size = offsetof(struct kdbus_cmd_info, items) + KDBUS_ITEM_SIZE(l);
575 cmd = alloca0_align(size, 8);
576 cmd->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
577 cmd->items[0].type = KDBUS_ITEM_NAME;
578 memcpy(cmd->items[0].str, name, l);
582 kdbus_translate_attach_flags(mask, (uint64_t*) &cmd->flags);
584 r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd);
588 conn_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
590 /* Non-activated names are considered not available */
591 if (conn_info->flags & KDBUS_HELLO_ACTIVATOR) {
605 if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
606 if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0) {
611 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
614 r = bus_populate_creds_from_items(bus, conn_info, mask, c);
626 kernel_cmd_free(bus, cmd->offset);
630 static int bus_get_name_creds_dbus1(
634 sd_bus_creds **creds) {
636 _cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL;
637 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
638 const char *unique = NULL;
642 /* Only query the owner if the caller wants to know it or if
643 * the caller just wants to check whether a name exists */
644 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
645 r = sd_bus_call_method(
647 "org.freedesktop.DBus",
648 "/org/freedesktop/DBus",
649 "org.freedesktop.DBus",
658 r = sd_bus_message_read(reply_unique, "s", &unique);
668 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
669 c->unique_name = strdup(unique);
673 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
676 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_GID|
677 SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
678 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|
679 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
680 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) {
683 r = sd_bus_call_method(
685 "org.freedesktop.DBus",
686 "/org/freedesktop/DBus",
687 "org.freedesktop.DBus",
688 "GetConnectionUnixProcessID",
692 unique ? unique : name);
696 r = sd_bus_message_read(reply, "u", &u);
701 if (mask & SD_BUS_CREDS_PID) {
703 c->mask |= SD_BUS_CREDS_PID;
706 reply = sd_bus_message_unref(reply);
709 if (mask & SD_BUS_CREDS_UID) {
712 r = sd_bus_call_method(
714 "org.freedesktop.DBus",
715 "/org/freedesktop/DBus",
716 "org.freedesktop.DBus",
717 "GetConnectionUnixUser",
721 unique ? unique : name);
725 r = sd_bus_message_read(reply, "u", &u);
730 c->mask |= SD_BUS_CREDS_UID;
732 reply = sd_bus_message_unref(reply);
735 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
736 const void *p = NULL;
739 r = sd_bus_call_method(
741 "org.freedesktop.DBus",
742 "/org/freedesktop/DBus",
743 "org.freedesktop.DBus",
744 "GetConnectionSELinuxSecurityContext",
748 unique ? unique : name);
752 r = sd_bus_message_read_array(reply, 'y', &p, &sz);
756 c->label = strndup(p, sz);
760 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
763 r = bus_creds_add_more(c, mask, pid, 0);
776 _public_ int sd_bus_get_name_creds(
780 sd_bus_creds **creds) {
782 assert_return(bus, -EINVAL);
783 assert_return(name, -EINVAL);
784 assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
785 assert_return(mask == 0 || creds, -EINVAL);
786 assert_return(!bus_pid_changed(bus), -ECHILD);
787 assert_return(service_name_is_valid(name), -EINVAL);
788 assert_return(bus->bus_client, -ENODATA);
790 if (!BUS_IS_OPEN(bus->state))
794 return bus_get_name_creds_kdbus(bus, name, mask, creds);
796 return bus_get_name_creds_dbus1(bus, name, mask, creds);
799 _public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
800 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
804 assert_return(bus, -EINVAL);
805 assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
806 assert_return(ret, -EINVAL);
807 assert_return(!bus_pid_changed(bus), -ECHILD);
809 if (!BUS_IS_OPEN(bus->state))
812 if (!bus->ucred_valid && !isempty(bus->label))
819 if (bus->ucred_valid) {
820 pid = c->pid = bus->ucred.pid;
821 c->uid = bus->ucred.uid;
822 c->gid = bus->ucred.gid;
824 c->mask |= (SD_BUS_CREDS_UID | SD_BUS_CREDS_PID | SD_BUS_CREDS_GID) & mask;
827 if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) {
828 c->label = strdup(bus->label);
832 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
835 if (bus->is_kernel) {
836 struct kdbus_cmd_info cmd = {};
837 struct kdbus_info *creator_info;
839 cmd.size = sizeof(cmd);
840 cmd.flags = _KDBUS_ATTACH_ALL;
841 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
845 creator_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
847 r = bus_populate_creds_from_items(bus, creator_info, mask, c);
848 kernel_cmd_free(bus, cmd.offset);
853 r = bus_creds_add_more(c, mask, pid, 0);
863 static int add_name_change_match(sd_bus *bus,
866 const char *old_owner,
867 const char *new_owner) {
869 uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0;
870 int is_name_id = -1, r;
871 struct kdbus_item *item;
875 /* If we encounter a match that could match against
876 * NameOwnerChanged messages, then we need to create
877 * KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and
878 * KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly
879 * multiple if the match is underspecified.
881 * The NameOwnerChanged signals take three parameters with
882 * unique or well-known names, but only some forms actually
885 * WELLKNOWN, "", UNIQUE → KDBUS_ITEM_NAME_ADD
886 * WELLKNOWN, UNIQUE, "" → KDBUS_ITEM_NAME_REMOVE
887 * WELLKNOWN, UNIQUE, UNIQUE → KDBUS_ITEM_NAME_CHANGE
888 * UNIQUE, "", UNIQUE → KDBUS_ITEM_ID_ADD
889 * UNIQUE, UNIQUE, "" → KDBUS_ITEM_ID_REMOVE
891 * For the latter two the two unique names must be identical.
896 is_name_id = bus_kernel_parse_unique_name(name, &name_id);
901 if (!isempty(old_owner)) {
902 r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
907 if (is_name_id > 0 && old_owner_id != name_id)
910 old_owner_id = KDBUS_MATCH_ID_ANY;
912 if (!isempty(new_owner)) {
913 r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
918 if (is_name_id > 0 && new_owner_id != name_id)
921 new_owner_id = KDBUS_MATCH_ID_ANY;
923 if (is_name_id <= 0) {
924 struct kdbus_cmd_match *m;
927 /* If the name argument is missing or is a well-known
928 * name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE}
931 l = name ? strlen(name) + 1 : 0;
933 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
934 offsetof(struct kdbus_item, name_change) +
935 offsetof(struct kdbus_notify_name_change, name) +
938 m = alloca0_align(sz, 8);
944 offsetof(struct kdbus_item, name_change) +
945 offsetof(struct kdbus_notify_name_change, name) +
948 item->name_change.old_id.id = old_owner_id;
949 item->name_change.new_id.id = new_owner_id;
952 memcpy(item->name_change.name, name, l);
954 /* If the old name is unset or empty, then
955 * this can match against added names */
956 if (!old_owner || old_owner[0] == 0) {
957 item->type = KDBUS_ITEM_NAME_ADD;
959 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
964 /* If the new name is unset or empty, then
965 * this can match against removed names */
966 if (!new_owner || new_owner[0] == 0) {
967 item->type = KDBUS_ITEM_NAME_REMOVE;
969 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
974 /* The CHANGE match we need in either case, because
975 * what is reported as a name change by the kernel
976 * might just be an owner change between starter and
977 * normal clients. For userspace such a change should
978 * be considered a removal/addition, hence let's
979 * subscribe to this unconditionally. */
980 item->type = KDBUS_ITEM_NAME_CHANGE;
981 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
986 if (is_name_id != 0) {
987 struct kdbus_cmd_match *m;
990 /* If the name argument is missing or is a unique
991 * name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches
994 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
995 offsetof(struct kdbus_item, id_change) +
996 sizeof(struct kdbus_notify_id_change));
998 m = alloca0_align(sz, 8);
1004 offsetof(struct kdbus_item, id_change) +
1005 sizeof(struct kdbus_notify_id_change);
1006 item->id_change.id = name_id;
1008 /* If the old name is unset or empty, then this can
1009 * match against added ids */
1010 if (!old_owner || old_owner[0] == 0) {
1011 item->type = KDBUS_ITEM_ID_ADD;
1013 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1018 /* If thew new name is unset or empty, then this can
1019 * match against removed ids */
1020 if (!new_owner || new_owner[0] == 0) {
1021 item->type = KDBUS_ITEM_ID_REMOVE;
1023 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1032 int bus_add_match_internal_kernel(
1034 struct bus_match_component *components,
1035 unsigned n_components,
1038 struct kdbus_cmd_match *m;
1039 struct kdbus_item *item;
1042 const char *sender = NULL;
1043 size_t sender_length = 0;
1044 uint64_t src_id = KDBUS_MATCH_ID_ANY;
1045 bool using_bloom = false;
1047 bool matches_name_change = true;
1048 const char *name_change_arg[3] = {};
1053 bloom = alloca0(bus->bloom_size);
1055 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items));
1057 for (i = 0; i < n_components; i++) {
1058 struct bus_match_component *c = &components[i];
1062 case BUS_MATCH_SENDER:
1063 if (!streq(c->value_str, "org.freedesktop.DBus"))
1064 matches_name_change = false;
1066 r = bus_kernel_parse_unique_name(c->value_str, &src_id);
1070 sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t));
1072 sender = c->value_str;
1073 sender_length = strlen(sender);
1074 sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
1079 case BUS_MATCH_MESSAGE_TYPE:
1080 if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
1081 matches_name_change = false;
1083 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "message-type", bus_message_type_to_string(c->value_u8));
1087 case BUS_MATCH_INTERFACE:
1088 if (!streq(c->value_str, "org.freedesktop.DBus"))
1089 matches_name_change = false;
1091 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "interface", c->value_str);
1095 case BUS_MATCH_MEMBER:
1096 if (!streq(c->value_str, "NameOwnerChanged"))
1097 matches_name_change = false;
1099 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "member", c->value_str);
1103 case BUS_MATCH_PATH:
1104 if (!streq(c->value_str, "/org/freedesktop/DBus"))
1105 matches_name_change = false;
1107 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path", c->value_str);
1111 case BUS_MATCH_PATH_NAMESPACE:
1112 if (!streq(c->value_str, "/")) {
1113 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path-slash-prefix", c->value_str);
1118 case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
1119 char buf[sizeof("arg")-1 + 2 + 1];
1121 if (c->type - BUS_MATCH_ARG < 3)
1122 name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str;
1124 snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
1125 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1130 case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
1131 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
1133 snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
1134 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1139 case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
1140 char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
1142 snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
1143 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1148 case BUS_MATCH_DESTINATION:
1149 /* The bloom filter does not include
1150 the destination, since it is only
1151 available for broadcast messages
1152 which do not carry a destination
1153 since they are undirected. */
1156 case BUS_MATCH_ROOT:
1157 case BUS_MATCH_VALUE:
1158 case BUS_MATCH_LEAF:
1159 case _BUS_MATCH_NODE_TYPE_MAX:
1160 case _BUS_MATCH_NODE_TYPE_INVALID:
1161 assert_not_reached("Invalid match type?");
1166 sz += ALIGN8(offsetof(struct kdbus_item, data64) + bus->bloom_size);
1168 m = alloca0_align(sz, 8);
1174 if (src_id != KDBUS_MATCH_ID_ANY) {
1175 item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t);
1176 item->type = KDBUS_ITEM_ID;
1178 item = KDBUS_ITEM_NEXT(item);
1182 item->size = offsetof(struct kdbus_item, data64) + bus->bloom_size;
1183 item->type = KDBUS_ITEM_BLOOM_MASK;
1184 memcpy(item->data64, bloom, bus->bloom_size);
1185 item = KDBUS_ITEM_NEXT(item);
1189 item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
1190 item->type = KDBUS_ITEM_NAME;
1191 memcpy(item->str, sender, sender_length + 1);
1194 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1198 if (matches_name_change) {
1200 /* If this match could theoretically match
1201 * NameOwnerChanged messages, we need to
1202 * install a second non-bloom filter explitly
1205 r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
1213 #define internal_match(bus, m) \
1214 ((bus)->hello_flags & KDBUS_HELLO_MONITOR \
1215 ? (isempty(m) ? "eavesdrop='true'" : strappenda((m), ",eavesdrop='true'")) \
1218 static int bus_add_match_internal_dbus1(
1220 const char *match) {
1227 e = internal_match(bus, match);
1229 return sd_bus_call_method(
1231 "org.freedesktop.DBus",
1232 "/org/freedesktop/DBus",
1233 "org.freedesktop.DBus",
1241 int bus_add_match_internal(
1244 struct bus_match_component *components,
1245 unsigned n_components,
1251 return bus_add_match_internal_kernel(bus, components, n_components, cookie);
1253 return bus_add_match_internal_dbus1(bus, match);
1256 int bus_remove_match_internal_kernel(
1260 struct kdbus_cmd_match m;
1266 m.size = offsetof(struct kdbus_cmd_match, items);
1269 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
1276 static int bus_remove_match_internal_dbus1(
1278 const char *match) {
1285 e = internal_match(bus, match);
1287 return sd_bus_call_method(
1289 "org.freedesktop.DBus",
1290 "/org/freedesktop/DBus",
1291 "org.freedesktop.DBus",
1299 int bus_remove_match_internal(
1307 return bus_remove_match_internal_kernel(bus, cookie);
1309 return bus_remove_match_internal_dbus1(bus, match);
1312 _public_ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
1313 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
1317 assert_return(bus, -EINVAL);
1318 assert_return(name, -EINVAL);
1319 assert_return(machine, -EINVAL);
1320 assert_return(!bus_pid_changed(bus), -ECHILD);
1321 assert_return(service_name_is_valid(name), -EINVAL);
1323 if (!BUS_IS_OPEN(bus->state))
1326 if (streq_ptr(name, bus->unique_name))
1327 return sd_id128_get_machine(machine);
1329 r = sd_bus_message_new_method_call(
1334 "org.freedesktop.DBus.Peer",
1339 r = sd_bus_message_set_auto_start(m, false);
1343 r = sd_bus_call(bus, m, 0, NULL, &reply);
1347 r = sd_bus_message_read(reply, "s", &mid);
1351 return sd_id128_from_string(mid, machine);