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 n->flags = request_name_flags_to_kdbus(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_get_list(sd_bus *bus, uint64_t flags, char ***x) {
227 struct kdbus_cmd_name_list cmd = {};
228 struct kdbus_name_list *name_list;
229 struct kdbus_name_info *name;
230 uint64_t previous_id = 0;
233 /* Caller will free half-constructed list on failure... */
237 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
241 name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
243 KDBUS_ITEM_FOREACH(name, name_list, names) {
245 struct kdbus_item *item;
246 const char *entry_name = NULL;
248 if ((flags & KDBUS_NAME_LIST_UNIQUE) && name->owner_id != previous_id) {
251 if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) {
256 r = strv_consume(x, n);
260 previous_id = name->owner_id;
263 KDBUS_ITEM_FOREACH(item, name, items)
264 if (item->type == KDBUS_ITEM_OWNED_NAME)
265 entry_name = item->name.name;
267 if (entry_name && service_name_is_valid(entry_name)) {
268 r = strv_extend(x, entry_name);
279 bus_kernel_cmd_free(bus, cmd.offset);
283 static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) {
284 _cleanup_strv_free_ char **x = NULL, **y = NULL;
288 r = kernel_get_list(bus, KDBUS_NAME_LIST_UNIQUE | KDBUS_NAME_LIST_NAMES, &x);
294 r = kernel_get_list(bus, KDBUS_NAME_LIST_ACTIVATORS, &y);
310 static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
311 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
312 _cleanup_strv_free_ char **x = NULL, **y = NULL;
316 r = sd_bus_call_method(
318 "org.freedesktop.DBus",
319 "/org/freedesktop/DBus",
320 "org.freedesktop.DBus",
328 r = sd_bus_message_read_strv(reply, &x);
332 reply = sd_bus_message_unref(reply);
336 r = sd_bus_call_method(
338 "org.freedesktop.DBus",
339 "/org/freedesktop/DBus",
340 "org.freedesktop.DBus",
341 "ListActivatableNames",
348 r = sd_bus_message_read_strv(reply, &y);
364 _public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
365 assert_return(bus, -EINVAL);
366 assert_return(acquired || activatable, -EINVAL);
367 assert_return(!bus_pid_changed(bus), -ECHILD);
369 if (!BUS_IS_OPEN(bus->state))
373 return bus_list_names_kernel(bus, acquired, activatable);
375 return bus_list_names_dbus1(bus, acquired, activatable);
378 static int bus_populate_creds_from_items(
380 struct kdbus_info *info,
384 struct kdbus_item *item;
392 KDBUS_ITEM_FOREACH(item, info, items) {
394 switch (item->type) {
396 case KDBUS_ITEM_PIDS:
398 if (mask & SD_BUS_CREDS_PID && item->pids.pid > 0) {
399 c->pid = (pid_t) item->pids.pid;
400 c->mask |= SD_BUS_CREDS_PID;
403 if (mask & SD_BUS_CREDS_TID && item->pids.tid > 0) {
404 c->tid = (pid_t) item->pids.tid;
405 c->mask |= SD_BUS_CREDS_TID;
408 if (mask & SD_BUS_CREDS_PID_STARTTIME && item->pids.starttime > 0) {
409 c->pid_starttime = item->pids.starttime;
410 c->mask |= SD_BUS_CREDS_PID_STARTTIME;
415 case KDBUS_ITEM_CREDS:
417 if (mask & SD_BUS_CREDS_UID && (uid_t) item->creds.uid != UID_INVALID) {
418 c->uid = (uid_t) item->creds.uid;
419 c->mask |= SD_BUS_CREDS_UID;
422 if (mask & SD_BUS_CREDS_EUID && (uid_t) item->creds.euid != UID_INVALID) {
423 c->euid = (uid_t) item->creds.euid;
424 c->mask |= SD_BUS_CREDS_EUID;
427 if (mask & SD_BUS_CREDS_SUID && (uid_t) item->creds.suid != UID_INVALID) {
428 c->suid = (uid_t) item->creds.suid;
429 c->mask |= SD_BUS_CREDS_SUID;
432 if (mask & SD_BUS_CREDS_FSUID && (uid_t) item->creds.fsuid != UID_INVALID) {
433 c->fsuid = (uid_t) item->creds.fsuid;
434 c->mask |= SD_BUS_CREDS_FSUID;
437 if (mask & SD_BUS_CREDS_GID && (gid_t) item->creds.gid != GID_INVALID) {
438 c->gid = (gid_t) item->creds.gid;
439 c->mask |= SD_BUS_CREDS_GID;
442 if (mask & SD_BUS_CREDS_EGID && (gid_t) item->creds.egid != GID_INVALID) {
443 c->egid = (gid_t) item->creds.egid;
444 c->mask |= SD_BUS_CREDS_EGID;
447 if (mask & SD_BUS_CREDS_SGID && (gid_t) item->creds.sgid != GID_INVALID) {
448 c->sgid = (gid_t) item->creds.sgid;
449 c->mask |= SD_BUS_CREDS_SGID;
452 if (mask & SD_BUS_CREDS_FSGID && (gid_t) item->creds.fsgid != GID_INVALID) {
453 c->fsgid = (gid_t) item->creds.fsgid;
454 c->mask |= SD_BUS_CREDS_FSGID;
459 case KDBUS_ITEM_PID_COMM:
460 if (mask & SD_BUS_CREDS_COMM) {
461 r = free_and_strdup(&c->comm, item->str);
465 c->mask |= SD_BUS_CREDS_COMM;
469 case KDBUS_ITEM_TID_COMM:
470 if (mask & SD_BUS_CREDS_TID_COMM) {
471 r = free_and_strdup(&c->tid_comm, item->str);
475 c->mask |= SD_BUS_CREDS_TID_COMM;
480 if (mask & SD_BUS_CREDS_EXE) {
481 r = free_and_strdup(&c->exe, item->str);
485 c->mask |= SD_BUS_CREDS_EXE;
489 case KDBUS_ITEM_CMDLINE:
490 if (mask & SD_BUS_CREDS_CMDLINE) {
491 c->cmdline_size = item->size - offsetof(struct kdbus_item, data);
492 c->cmdline = memdup(item->data, c->cmdline_size);
496 c->mask |= SD_BUS_CREDS_CMDLINE;
500 case KDBUS_ITEM_CGROUP:
501 m = (SD_BUS_CREDS_CGROUP | SD_BUS_CREDS_UNIT |
502 SD_BUS_CREDS_USER_UNIT | SD_BUS_CREDS_SLICE |
503 SD_BUS_CREDS_SESSION | SD_BUS_CREDS_OWNER_UID) & mask;
506 r = free_and_strdup(&c->cgroup, item->str);
510 r = bus_get_root_path(bus);
514 r = free_and_strdup(&c->cgroup_root, bus->cgroup_root);
522 case KDBUS_ITEM_CAPS:
523 m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS |
524 SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask;
527 c->capability_size = item->size - offsetof(struct kdbus_item, caps.caps);
528 c->capability = memdup(item->caps.caps, c->capability_size);
536 case KDBUS_ITEM_SECLABEL:
537 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
538 r = free_and_strdup(&c->label, item->str);
542 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
546 case KDBUS_ITEM_AUDIT:
547 if (mask & SD_BUS_CREDS_AUDIT_SESSION_ID && (uint32_t) item->audit.sessionid != (uint32_t) -1) {
548 c->audit_session_id = (uint32_t) item->audit.sessionid;
549 c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID;
552 if (mask & SD_BUS_CREDS_AUDIT_LOGIN_UID && (uid_t) item->audit.loginuid != UID_INVALID) {
553 c->audit_login_uid = (uid_t) item->audit.loginuid;
554 c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
558 case KDBUS_ITEM_OWNED_NAME:
559 if ((mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) && service_name_is_valid(item->name.name)) {
560 r = strv_extend(&c->well_known_names, item->name.name);
564 c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
568 case KDBUS_ITEM_CONN_DESCRIPTION:
569 if (mask & SD_BUS_CREDS_DESCRIPTION) {
570 r = free_and_strdup(&c->description, item->str);
574 c->mask |= SD_BUS_CREDS_DESCRIPTION;
578 case KDBUS_ITEM_AUXGROUPS:
579 if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
583 assert_cc(sizeof(gid_t) == sizeof(uint32_t));
585 n = (item->size - offsetof(struct kdbus_item, data32)) / sizeof(uint32_t);
586 g = newdup(gid_t, item->data32, n);
590 free(c->supplementary_gids);
591 c->supplementary_gids = g;
592 c->n_supplementary_gids = n;
594 c->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
603 static int bus_get_name_creds_kdbus(
607 sd_bus_creds **creds) {
609 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
610 struct kdbus_cmd_info *cmd;
611 struct kdbus_info *conn_info;
616 r = bus_kernel_parse_unique_name(name, &id);
620 size = offsetof(struct kdbus_cmd_info, items);
621 cmd = alloca0_align(size, 8);
624 l = strlen(name) + 1;
625 size = offsetof(struct kdbus_cmd_info, items) + KDBUS_ITEM_SIZE(l);
626 cmd = alloca0_align(size, 8);
627 cmd->items[0].size = KDBUS_ITEM_HEADER_SIZE + l;
628 cmd->items[0].type = KDBUS_ITEM_NAME;
629 memcpy(cmd->items[0].str, name, l);
633 cmd->flags = attach_flags_to_kdbus(mask);
635 /* If augmentation is on, and the bus doesn't didn't allow us
636 * to get the bits we want, then ask for the PID/TID so that we
637 * can read the rest from /proc. */
638 if ((mask & SD_BUS_CREDS_AUGMENT) &&
639 (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
640 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
641 SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
642 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|
643 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
644 SD_BUS_CREDS_SELINUX_CONTEXT|
645 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)))
646 cmd->flags |= KDBUS_ATTACH_PIDS;
648 r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd);
652 conn_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
654 /* Non-activated names are considered not available */
655 if (conn_info->flags & KDBUS_HELLO_ACTIVATOR) {
669 if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
670 if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0) {
675 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
678 /* If KDBUS_ITEM_OWNED_NAME is requested then we'll get 0 of
679 them in case the service has no names. This does not mean
680 however that the list of owned names could not be
681 acquired. Hence, let's explicitly clarify that the data is
683 c->mask |= mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
685 r = bus_populate_creds_from_items(bus, conn_info, mask, c);
689 r = bus_creds_add_more(c, mask, 0, 0);
701 bus_kernel_cmd_free(bus, cmd->offset);
705 static int bus_get_name_creds_dbus1(
709 sd_bus_creds **creds) {
711 _cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL;
712 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
713 const char *unique = NULL;
717 /* Only query the owner if the caller wants to know it or if
718 * the caller just wants to check whether a name exists */
719 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
720 r = sd_bus_call_method(
722 "org.freedesktop.DBus",
723 "/org/freedesktop/DBus",
724 "org.freedesktop.DBus",
733 r = sd_bus_message_read(reply_unique, "s", &unique);
743 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
744 c->unique_name = strdup(unique);
748 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
751 if ((mask & SD_BUS_CREDS_PID) ||
752 ((mask & SD_BUS_CREDS_AUGMENT) &&
753 (mask & (SD_BUS_CREDS_PID_STARTTIME|
754 SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
755 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
756 SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
757 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|
758 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
759 SD_BUS_CREDS_SELINUX_CONTEXT|
760 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)))) {
764 r = sd_bus_call_method(
766 "org.freedesktop.DBus",
767 "/org/freedesktop/DBus",
768 "org.freedesktop.DBus",
769 "GetConnectionUnixProcessID",
773 unique ? unique : name);
777 r = sd_bus_message_read(reply, "u", &u);
782 if (mask & SD_BUS_CREDS_PID) {
784 c->mask |= SD_BUS_CREDS_PID;
787 reply = sd_bus_message_unref(reply);
790 if (mask & SD_BUS_CREDS_UID) {
793 r = sd_bus_call_method(
795 "org.freedesktop.DBus",
796 "/org/freedesktop/DBus",
797 "org.freedesktop.DBus",
798 "GetConnectionUnixUser",
802 unique ? unique : name);
806 r = sd_bus_message_read(reply, "u", &u);
811 c->mask |= SD_BUS_CREDS_UID;
813 reply = sd_bus_message_unref(reply);
816 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
817 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
818 const void *p = NULL;
821 r = sd_bus_call_method(
823 "org.freedesktop.DBus",
824 "/org/freedesktop/DBus",
825 "org.freedesktop.DBus",
826 "GetConnectionSELinuxSecurityContext",
830 unique ? unique : name);
832 if (!sd_bus_error_has_name(&error, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"))
835 r = sd_bus_message_read_array(reply, 'y', &p, &sz);
839 c->label = strndup(p, sz);
843 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
847 r = bus_creds_add_more(c, mask, pid, 0);
860 _public_ int sd_bus_get_name_creds(
864 sd_bus_creds **creds) {
866 assert_return(bus, -EINVAL);
867 assert_return(name, -EINVAL);
868 assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -ENOTSUP);
869 assert_return(mask == 0 || creds, -EINVAL);
870 assert_return(!bus_pid_changed(bus), -ECHILD);
871 assert_return(service_name_is_valid(name), -EINVAL);
872 assert_return(bus->bus_client, -ENODATA);
874 if (!BUS_IS_OPEN(bus->state))
878 return bus_get_name_creds_kdbus(bus, name, mask, creds);
880 return bus_get_name_creds_dbus1(bus, name, mask, creds);
883 static int bus_get_owner_creds_kdbus(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
884 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
885 struct kdbus_cmd_info cmd = {
886 .size = sizeof(struct kdbus_cmd_info)
888 struct kdbus_info *creator_info;
896 cmd.flags = attach_flags_to_kdbus(mask);
898 /* If augmentation is on, and the bus doesn't didn't allow us
899 * to get the bits we want, then ask for the PID/TID so that we
900 * can read the rest from /proc. */
901 if ((mask & SD_BUS_CREDS_AUGMENT) &&
902 (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
903 SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
904 SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
905 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|
906 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
907 SD_BUS_CREDS_SELINUX_CONTEXT|
908 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)))
909 cmd.flags |= KDBUS_ATTACH_PIDS;
911 r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
915 creator_info = (struct kdbus_info *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
917 r = bus_populate_creds_from_items(bus, creator_info, mask, c);
918 bus_kernel_cmd_free(bus, cmd.offset);
922 r = bus_creds_add_more(c, mask, pid, 0);
931 static int bus_get_owner_creds_dbus1(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
932 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
936 if (!bus->ucred_valid && !isempty(bus->label))
943 if (bus->ucred_valid) {
944 if (bus->ucred.pid > 0) {
945 pid = c->pid = bus->ucred.pid;
946 c->mask |= SD_BUS_CREDS_PID & mask;
949 if (bus->ucred.uid != UID_INVALID) {
950 c->uid = bus->ucred.uid;
951 c->mask |= SD_BUS_CREDS_UID & mask;
954 if (bus->ucred.gid != GID_INVALID) {
955 c->gid = bus->ucred.gid;
956 c->mask |= SD_BUS_CREDS_GID & mask;
960 if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) {
961 c->label = strdup(bus->label);
965 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
968 r = bus_creds_add_more(c, mask, pid, 0);
977 _public_ int sd_bus_get_owner_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) {
978 assert_return(bus, -EINVAL);
979 assert_return((mask & ~SD_BUS_CREDS_AUGMENT) <= _SD_BUS_CREDS_ALL, -ENOTSUP);
980 assert_return(ret, -EINVAL);
981 assert_return(!bus_pid_changed(bus), -ECHILD);
983 if (!BUS_IS_OPEN(bus->state))
987 return bus_get_owner_creds_kdbus(bus, mask, ret);
989 return bus_get_owner_creds_dbus1(bus, mask, ret);
992 static int add_name_change_match(sd_bus *bus,
995 const char *old_owner,
996 const char *new_owner) {
998 uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0;
999 int is_name_id = -1, r;
1000 struct kdbus_item *item;
1004 /* If we encounter a match that could match against
1005 * NameOwnerChanged messages, then we need to create
1006 * KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and
1007 * KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly
1008 * multiple if the match is underspecified.
1010 * The NameOwnerChanged signals take three parameters with
1011 * unique or well-known names, but only some forms actually
1014 * WELLKNOWN, "", UNIQUE → KDBUS_ITEM_NAME_ADD
1015 * WELLKNOWN, UNIQUE, "" → KDBUS_ITEM_NAME_REMOVE
1016 * WELLKNOWN, UNIQUE, UNIQUE → KDBUS_ITEM_NAME_CHANGE
1017 * UNIQUE, "", UNIQUE → KDBUS_ITEM_ID_ADD
1018 * UNIQUE, UNIQUE, "" → KDBUS_ITEM_ID_REMOVE
1020 * For the latter two the two unique names must be identical.
1025 is_name_id = bus_kernel_parse_unique_name(name, &name_id);
1030 if (!isempty(old_owner)) {
1031 r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
1036 if (is_name_id > 0 && old_owner_id != name_id)
1039 old_owner_id = KDBUS_MATCH_ID_ANY;
1041 if (!isempty(new_owner)) {
1042 r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
1047 if (is_name_id > 0 && new_owner_id != name_id)
1050 new_owner_id = KDBUS_MATCH_ID_ANY;
1052 if (is_name_id <= 0) {
1053 struct kdbus_cmd_match *m;
1056 /* If the name argument is missing or is a well-known
1057 * name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE}
1060 l = name ? strlen(name) + 1 : 0;
1062 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
1063 offsetof(struct kdbus_item, name_change) +
1064 offsetof(struct kdbus_notify_name_change, name) +
1067 m = alloca0_align(sz, 8);
1073 offsetof(struct kdbus_item, name_change) +
1074 offsetof(struct kdbus_notify_name_change, name) +
1077 item->name_change.old_id.id = old_owner_id;
1078 item->name_change.new_id.id = new_owner_id;
1081 memcpy(item->name_change.name, name, l);
1083 /* If the old name is unset or empty, then
1084 * this can match against added names */
1085 if (!old_owner || old_owner[0] == 0) {
1086 item->type = KDBUS_ITEM_NAME_ADD;
1088 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1093 /* If the new name is unset or empty, then
1094 * this can match against removed names */
1095 if (!new_owner || new_owner[0] == 0) {
1096 item->type = KDBUS_ITEM_NAME_REMOVE;
1098 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1103 /* The CHANGE match we need in either case, because
1104 * what is reported as a name change by the kernel
1105 * might just be an owner change between starter and
1106 * normal clients. For userspace such a change should
1107 * be considered a removal/addition, hence let's
1108 * subscribe to this unconditionally. */
1109 item->type = KDBUS_ITEM_NAME_CHANGE;
1110 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1115 if (is_name_id != 0) {
1116 struct kdbus_cmd_match *m;
1119 /* If the name argument is missing or is a unique
1120 * name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches
1123 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
1124 offsetof(struct kdbus_item, id_change) +
1125 sizeof(struct kdbus_notify_id_change));
1127 m = alloca0_align(sz, 8);
1133 offsetof(struct kdbus_item, id_change) +
1134 sizeof(struct kdbus_notify_id_change);
1135 item->id_change.id = name_id;
1137 /* If the old name is unset or empty, then this can
1138 * match against added ids */
1139 if (!old_owner || old_owner[0] == 0) {
1140 item->type = KDBUS_ITEM_ID_ADD;
1142 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1147 /* If thew new name is unset or empty, then this can
1148 * match against removed ids */
1149 if (!new_owner || new_owner[0] == 0) {
1150 item->type = KDBUS_ITEM_ID_REMOVE;
1152 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1161 int bus_add_match_internal_kernel(
1163 struct bus_match_component *components,
1164 unsigned n_components,
1167 struct kdbus_cmd_match *m;
1168 struct kdbus_item *item;
1171 const char *sender = NULL;
1172 size_t sender_length = 0;
1173 uint64_t src_id = KDBUS_MATCH_ID_ANY;
1174 bool using_bloom = false;
1176 bool matches_name_change = true;
1177 const char *name_change_arg[3] = {};
1182 bloom = alloca0(bus->bloom_size);
1184 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items));
1186 for (i = 0; i < n_components; i++) {
1187 struct bus_match_component *c = &components[i];
1191 case BUS_MATCH_SENDER:
1192 if (!streq(c->value_str, "org.freedesktop.DBus"))
1193 matches_name_change = false;
1195 r = bus_kernel_parse_unique_name(c->value_str, &src_id);
1199 sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t));
1201 sender = c->value_str;
1202 sender_length = strlen(sender);
1203 sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
1208 case BUS_MATCH_MESSAGE_TYPE:
1209 if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
1210 matches_name_change = false;
1212 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "message-type", bus_message_type_to_string(c->value_u8));
1216 case BUS_MATCH_INTERFACE:
1217 if (!streq(c->value_str, "org.freedesktop.DBus"))
1218 matches_name_change = false;
1220 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "interface", c->value_str);
1224 case BUS_MATCH_MEMBER:
1225 if (!streq(c->value_str, "NameOwnerChanged"))
1226 matches_name_change = false;
1228 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "member", c->value_str);
1232 case BUS_MATCH_PATH:
1233 if (!streq(c->value_str, "/org/freedesktop/DBus"))
1234 matches_name_change = false;
1236 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path", c->value_str);
1240 case BUS_MATCH_PATH_NAMESPACE:
1241 if (!streq(c->value_str, "/")) {
1242 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path-slash-prefix", c->value_str);
1247 case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
1248 char buf[sizeof("arg")-1 + 2 + 1];
1250 if (c->type - BUS_MATCH_ARG < 3)
1251 name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str;
1253 snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
1254 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1259 case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
1260 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
1262 snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
1263 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1268 case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
1269 char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
1271 snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
1272 bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
1277 case BUS_MATCH_DESTINATION:
1278 /* The bloom filter does not include
1279 the destination, since it is only
1280 available for broadcast messages
1281 which do not carry a destination
1282 since they are undirected. */
1285 case BUS_MATCH_ROOT:
1286 case BUS_MATCH_VALUE:
1287 case BUS_MATCH_LEAF:
1288 case _BUS_MATCH_NODE_TYPE_MAX:
1289 case _BUS_MATCH_NODE_TYPE_INVALID:
1290 assert_not_reached("Invalid match type?");
1295 sz += ALIGN8(offsetof(struct kdbus_item, data64) + bus->bloom_size);
1297 m = alloca0_align(sz, 8);
1303 if (src_id != KDBUS_MATCH_ID_ANY) {
1304 item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t);
1305 item->type = KDBUS_ITEM_ID;
1307 item = KDBUS_ITEM_NEXT(item);
1311 item->size = offsetof(struct kdbus_item, data64) + bus->bloom_size;
1312 item->type = KDBUS_ITEM_BLOOM_MASK;
1313 memcpy(item->data64, bloom, bus->bloom_size);
1314 item = KDBUS_ITEM_NEXT(item);
1318 item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
1319 item->type = KDBUS_ITEM_NAME;
1320 memcpy(item->str, sender, sender_length + 1);
1323 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
1327 if (matches_name_change) {
1329 /* If this match could theoretically match
1330 * NameOwnerChanged messages, we need to
1331 * install a second non-bloom filter explitly
1334 r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
1342 #define internal_match(bus, m) \
1343 ((bus)->hello_flags & KDBUS_HELLO_MONITOR \
1344 ? (isempty(m) ? "eavesdrop='true'" : strappenda((m), ",eavesdrop='true'")) \
1347 static int bus_add_match_internal_dbus1(
1349 const char *match) {
1356 e = internal_match(bus, match);
1358 return sd_bus_call_method(
1360 "org.freedesktop.DBus",
1361 "/org/freedesktop/DBus",
1362 "org.freedesktop.DBus",
1370 int bus_add_match_internal(
1373 struct bus_match_component *components,
1374 unsigned n_components,
1380 return bus_add_match_internal_kernel(bus, components, n_components, cookie);
1382 return bus_add_match_internal_dbus1(bus, match);
1385 int bus_remove_match_internal_kernel(
1389 struct kdbus_cmd_match m;
1395 m.size = offsetof(struct kdbus_cmd_match, items);
1398 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
1405 static int bus_remove_match_internal_dbus1(
1407 const char *match) {
1414 e = internal_match(bus, match);
1416 return sd_bus_call_method(
1418 "org.freedesktop.DBus",
1419 "/org/freedesktop/DBus",
1420 "org.freedesktop.DBus",
1428 int bus_remove_match_internal(
1436 return bus_remove_match_internal_kernel(bus, cookie);
1438 return bus_remove_match_internal_dbus1(bus, match);
1441 _public_ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
1442 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
1446 assert_return(bus, -EINVAL);
1447 assert_return(name, -EINVAL);
1448 assert_return(machine, -EINVAL);
1449 assert_return(!bus_pid_changed(bus), -ECHILD);
1450 assert_return(service_name_is_valid(name), -EINVAL);
1452 if (!BUS_IS_OPEN(bus->state))
1455 if (streq_ptr(name, bus->unique_name))
1456 return sd_id128_get_machine(machine);
1458 r = sd_bus_message_new_method_call(
1463 "org.freedesktop.DBus.Peer",
1468 r = sd_bus_message_set_auto_start(m, false);
1472 r = sd_bus_call(bus, m, 0, NULL, &reply);
1476 r = sd_bus_message_read(reply, "s", &mid);
1480 return sd_id128_from_string(mid, machine);