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>
32 #include "bus-internal.h"
33 #include "bus-message.h"
34 #include "bus-control.h"
35 #include "bus-bloom.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 _public_ int sd_bus_request_name(sd_bus *bus, const char *name, int flags) {
54 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
58 assert_return(bus, -EINVAL);
59 assert_return(name, -EINVAL);
60 assert_return(bus->bus_client, -EINVAL);
61 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
62 assert_return(!bus_pid_changed(bus), -ECHILD);
65 struct kdbus_cmd_name *n;
69 n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
70 n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
71 kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags);
72 memcpy(n->name, name, l+1);
74 #ifdef HAVE_VALGRIND_MEMCHECK_H
75 VALGRIND_MAKE_MEM_DEFINED(n, n->size);
78 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
80 if (errno == -EALREADY)
81 return SD_BUS_NAME_ALREADY_OWNER;
84 return SD_BUS_NAME_EXISTS;
89 if (n->flags & KDBUS_NAME_IN_QUEUE)
90 return SD_BUS_NAME_IN_QUEUE;
92 return SD_BUS_NAME_PRIMARY_OWNER;
94 r = sd_bus_call_method(
96 "org.freedesktop.DBus",
98 "org.freedesktop.DBus",
108 r = sd_bus_message_read(reply, "u", &ret);
116 _public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
117 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
121 assert_return(bus, -EINVAL);
122 assert_return(name, -EINVAL);
123 assert_return(bus->bus_client, -EINVAL);
124 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
125 assert_return(!bus_pid_changed(bus), -ECHILD);
127 if (bus->is_kernel) {
128 struct kdbus_cmd_name *n;
132 n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
133 n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
134 memcpy(n->name, name, l+1);
136 #ifdef HAVE_VALGRIND_MEMCHECK_H
137 VALGRIND_MAKE_MEM_DEFINED(n, n->size);
139 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
145 r = sd_bus_call_method(
147 "org.freedesktop.DBus",
149 "org.freedesktop.DBus",
158 r = sd_bus_message_read(reply, "u", &ret);
166 _public_ int sd_bus_list_names(sd_bus *bus, char ***l) {
167 _cleanup_bus_message_unref_ sd_bus_message *reply1 = NULL, *reply2 = NULL;
171 assert_return(bus, -EINVAL);
172 assert_return(l, -EINVAL);
173 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
174 assert_return(!bus_pid_changed(bus), -ECHILD);
176 if (bus->is_kernel) {
177 _cleanup_free_ struct kdbus_cmd_name_list *cmd = NULL;
178 struct kdbus_name_list *name_list;
179 struct kdbus_cmd_name *name;
181 cmd = malloc0(sizeof(struct kdbus_cmd_name_list *));
185 cmd->flags = KDBUS_NAME_LIST_UNIQUE_NAMES;
187 r = ioctl(sd_bus_get_fd(bus), KDBUS_CMD_NAME_LIST, cmd);
191 name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
193 KDBUS_PART_FOREACH(name, name_list, names) {
196 if (name->size > sizeof(*name))
199 asprintf(&n, ":1.%llu", (unsigned long long) name->id);
201 r = strv_extend(&x, n);
206 r = ioctl(sd_bus_get_fd(bus), KDBUS_CMD_FREE, &cmd->offset);
212 r = sd_bus_call_method(
214 "org.freedesktop.DBus",
216 "org.freedesktop.DBus",
224 r = sd_bus_call_method(
226 "org.freedesktop.DBus",
228 "org.freedesktop.DBus",
229 "ListActivatableNames",
236 r = bus_message_read_strv_extend(reply1, &x);
242 r = bus_message_read_strv_extend(reply2, &x);
254 static int bus_get_owner_dbus(
258 sd_bus_creds **creds) {
260 _cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL;
261 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
262 const char *unique = NULL;
266 /* Only query the owner if the caller wants to know it or if
267 * the caller just wants to check whether a name exists */
268 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
269 r = sd_bus_call_method(
271 "org.freedesktop.DBus",
273 "org.freedesktop.DBus",
282 r = sd_bus_message_read(reply_unique, "s", &unique);
292 if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
293 c->unique_name = strdup(unique);
297 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
300 if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_GID|
301 SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
302 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|
303 SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
304 SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) {
307 r = sd_bus_call_method(
309 "org.freedesktop.DBus",
311 "org.freedesktop.DBus",
312 "GetConnectionUnixProcessID",
316 unique ? unique : name);
320 r = sd_bus_message_read(reply, "u", &u);
325 if (mask & SD_BUS_CREDS_PID) {
327 c->mask |= SD_BUS_CREDS_PID;
330 reply = sd_bus_message_unref(reply);
333 if (mask & SD_BUS_CREDS_UID) {
336 r = sd_bus_call_method(
338 "org.freedesktop.DBus",
340 "org.freedesktop.DBus",
341 "GetConnectionUnixUser",
345 unique ? unique : name);
349 r = sd_bus_message_read(reply, "u", &u);
354 c->mask |= SD_BUS_CREDS_UID;
356 reply = sd_bus_message_unref(reply);
359 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
363 r = sd_bus_call_method(
365 "org.freedesktop.DBus",
367 "org.freedesktop.DBus",
368 "GetConnectionSELinuxSecurityContext",
372 unique ? unique : name);
376 r = sd_bus_message_read_array(reply, 'y', &p, &sz);
380 c->label = strndup(p, sz);
384 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
387 r = bus_creds_add_more(c, mask, pid, 0);
400 static int bus_get_owner_kdbus(
404 sd_bus_creds **creds) {
406 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
407 struct kdbus_cmd_name_info *cmd;
408 struct kdbus_name_info *name_info;
409 struct kdbus_item *item;
414 r = bus_kernel_parse_unique_name(name, &id);
418 size = offsetof(struct kdbus_cmd_name_info, name);
422 size = offsetof(struct kdbus_cmd_name_info, name) + strlen(name) + 1;
424 strcpy(cmd->name, name);
428 r = ioctl(bus->input_fd, KDBUS_CMD_NAME_INFO, cmd);
432 name_info = (struct kdbus_name_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
438 if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
439 if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) name_info->id) < 0)
442 c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
445 KDBUS_PART_FOREACH(item, name_info, items) {
447 switch (item->type) {
449 case KDBUS_ITEM_CREDS:
450 m = (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID | SD_BUS_CREDS_PID |
451 SD_BUS_CREDS_TID | SD_BUS_CREDS_PID_STARTTIME) & mask;
454 c->uid = item->creds.uid;
455 c->pid = item->creds.pid;
456 c->gid = item->creds.gid;
457 c->tid = item->creds.tid;
458 c->pid_starttime = item->creds.starttime;
463 case KDBUS_ITEM_PID_COMM:
464 if (mask & SD_BUS_CREDS_COMM) {
465 c->comm = strdup(item->str);
471 c->mask |= SD_BUS_CREDS_COMM;
475 case KDBUS_ITEM_TID_COMM:
476 if (mask & SD_BUS_CREDS_TID_COMM) {
477 c->tid_comm = strdup(item->str);
483 c->mask |= SD_BUS_CREDS_TID_COMM;
488 if (mask & SD_BUS_CREDS_EXE) {
489 c->exe = strdup(item->str);
495 c->mask |= SD_BUS_CREDS_EXE;
499 case KDBUS_ITEM_CMDLINE:
500 if (mask & SD_BUS_CREDS_CMDLINE) {
501 c->cmdline_size = item->size - KDBUS_PART_HEADER_SIZE;
502 c->cmdline = memdup(item->data, c->cmdline_size);
508 c->mask |= SD_BUS_CREDS_CMDLINE;
512 case KDBUS_ITEM_CGROUP:
513 m = (SD_BUS_CREDS_CGROUP | SD_BUS_CREDS_UNIT |
514 SD_BUS_CREDS_USER_UNIT | SD_BUS_CREDS_SLICE |
515 SD_BUS_CREDS_SESSION | SD_BUS_CREDS_OWNER_UID) & mask;
518 c->cgroup = strdup(item->str);
528 case KDBUS_ITEM_CAPS:
529 m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS |
530 SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask;
533 c->capability_size = item->size - KDBUS_PART_HEADER_SIZE;
534 c->capability = memdup(item->data, c->capability_size);
535 if (!c->capability) {
544 case KDBUS_ITEM_SECLABEL:
545 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
546 c->label = strdup(item->str);
552 c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
556 case KDBUS_ITEM_AUDIT:
557 m = (SD_BUS_CREDS_AUDIT_SESSION_ID | SD_BUS_CREDS_AUDIT_LOGIN_UID) & mask;
560 c->audit_session_id = item->audit.sessionid;
561 c->audit_login_uid = item->audit.loginuid;
566 case KDBUS_ITEM_NAMES:
567 if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
568 c->well_known_names_size = item->size - KDBUS_PART_HEADER_SIZE;
569 c->well_known_names = memdup(item->data, c->well_known_names_size);
570 if (!c->well_known_names) {
575 c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
589 ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd->offset);
593 _public_ int sd_bus_get_owner(
597 sd_bus_creds **creds) {
599 assert_return(bus, -EINVAL);
600 assert_return(name, -EINVAL);
601 assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
602 assert_return(mask == 0 || creds, -EINVAL);
603 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
604 assert_return(!bus_pid_changed(bus), -ECHILD);
607 return bus_get_owner_kdbus(bus, name, mask, creds);
609 return bus_get_owner_dbus(bus, name, mask, creds);
612 static int add_name_change_match(sd_bus *bus,
615 const char *old_owner,
616 const char *new_owner) {
618 uint64_t name_id = 0, old_owner_id = 0, new_owner_id = 0;
619 int is_name_id = -1, r;
620 struct kdbus_item *item;
624 /* If we encounter a match that could match against
625 * NameOwnerChanged messages, then we need to create
626 * KDBUS_MATCH_NAME_{ADD,REMOVE,CHANGE} and
627 * KDBUS_MATCH_ID_{ADD,REMOVE} matches for it, possibly
628 * multiple if the match is underspecified.
630 * The NameOwnerChanged signals take three parameters with
631 * unique or well-known names, but only some forms actually
634 * WELLKNOWN, "", UNIQUE → KDBUS_MATCH_NAME_ADD
635 * WELLKNOWN, UNIQUE, "" → KDBUS_MATCH_NAME_REMOVE
636 * WELLKNOWN, UNIQUE, UNIQUE → KDBUS_MATCH_NAME_CHANGE
637 * UNIQUE, "", UNIQUE → KDBUS_MATCH_ID_ADD
638 * UNIQUE, UNIQUE, "" → KDBUS_MATCH_ID_REMOVE
640 * For the latter two the two unique names must be identical.
645 is_name_id = bus_kernel_parse_unique_name(name, &name_id);
651 r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
656 if (is_name_id > 0 && old_owner_id != name_id)
661 r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
666 if (is_name_id > 0 && new_owner_id != name_id)
670 if (is_name_id <= 0) {
671 struct kdbus_cmd_match *m;
674 /* If the name argument is missing or is a well-known
675 * name, then add KDBUS_MATCH_NAME_{ADD,REMOVE,CHANGE}
678 l = name ? strlen(name) : 0;
680 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
681 offsetof(struct kdbus_item, name_change) +
682 offsetof(struct kdbus_notify_name_change, name) +
688 m->src_id = KDBUS_SRC_ID_KERNEL;
692 offsetof(struct kdbus_item, name_change) +
693 offsetof(struct kdbus_notify_name_change, name) +
696 item->name_change.old_id = old_owner_id;
697 item->name_change.new_id = new_owner_id;
700 strcpy(item->name_change.name, name);
702 /* If the old name is unset or empty, then
703 * this can match against added names */
704 if (!old_owner || old_owner[0] == 0) {
705 item->type = KDBUS_MATCH_NAME_ADD;
707 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
712 /* If the new name is unset or empty, then
713 * this can match against removed names */
714 if (!new_owner || new_owner[0] == 0) {
715 item->type = KDBUS_MATCH_NAME_REMOVE;
717 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
722 /* If the neither name is explicitly set to
723 * the empty string, then this can match
724 * agains changed names */
725 if (!(old_owner && old_owner[0] == 0) &&
726 !(new_owner && new_owner[0] == 0)) {
727 item->type = KDBUS_MATCH_NAME_CHANGE;
729 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
735 if (is_name_id != 0) {
736 struct kdbus_cmd_match *m;
739 /* If the name argument is missing or is a unique
740 * name, then add KDBUS_MATCH_ID_{ADD,REMOVE} matches
743 sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
744 offsetof(struct kdbus_item, id_change) +
745 sizeof(struct kdbus_notify_id_change));
750 m->src_id = KDBUS_SRC_ID_KERNEL;
753 item->size = offsetof(struct kdbus_item, id_change) + sizeof(struct kdbus_notify_id_change);
754 item->id_change.id = name_id;
756 /* If the old name is unset or empty, then this can
757 * match against added ids */
758 if (!old_owner || old_owner[0] == 0) {
759 item->type = KDBUS_MATCH_ID_ADD;
761 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
766 /* If thew new name is unset or empty, then this can
767 match against removed ids */
768 if (!new_owner || new_owner[0] == 0) {
769 item->type = KDBUS_MATCH_ID_REMOVE;
771 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
780 int bus_add_match_internal(
783 struct bus_match_component *components,
784 unsigned n_components,
792 if (bus->is_kernel) {
793 struct kdbus_cmd_match *m;
794 struct kdbus_item *item;
795 uint64_t bloom[BLOOM_SIZE/8];
797 const char *sender = NULL;
798 size_t sender_length = 0;
799 uint64_t src_id = KDBUS_MATCH_SRC_ID_ANY;
800 bool using_bloom = false;
802 bool matches_name_change = true;
803 const char *name_change_arg[3] = {};
807 sz = offsetof(struct kdbus_cmd_match, items);
809 for (i = 0; i < n_components; i++) {
810 struct bus_match_component *c = &components[i];
814 case BUS_MATCH_SENDER:
815 if (!streq(c->value_str, "org.freedesktop.DBus"))
816 matches_name_change = false;
818 r = bus_kernel_parse_unique_name(c->value_str, &src_id);
823 sender = c->value_str;
824 sender_length = strlen(sender);
825 sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
830 case BUS_MATCH_MESSAGE_TYPE:
831 if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
832 matches_name_change = false;
834 bloom_add_pair(bloom, "message-type", bus_message_type_to_string(c->value_u8));
838 case BUS_MATCH_INTERFACE:
839 if (!streq(c->value_str, "org.freedesktop.DBus"))
840 matches_name_change = false;
842 bloom_add_pair(bloom, "interface", c->value_str);
846 case BUS_MATCH_MEMBER:
847 if (!streq(c->value_str, "NameOwnerChanged"))
848 matches_name_change = false;
850 bloom_add_pair(bloom, "member", c->value_str);
855 if (!streq(c->value_str, "/org/freedesktop/DBus"))
856 matches_name_change = false;
858 bloom_add_pair(bloom, "path", c->value_str);
862 case BUS_MATCH_PATH_NAMESPACE:
863 if (!streq(c->value_str, "/")) {
864 bloom_add_pair(bloom, "path-slash-prefix", c->value_str);
869 case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
870 char buf[sizeof("arg")-1 + 2 + 1];
872 if (c->type - BUS_MATCH_ARG < 3)
873 name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str;
875 snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
876 bloom_add_pair(bloom, buf, c->value_str);
881 case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
882 char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
884 snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
885 bloom_add_pair(bloom, buf, c->value_str);
890 case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
891 char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
893 snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
894 bloom_add_pair(bloom, buf, c->value_str);
899 case BUS_MATCH_DESTINATION:
900 /* The bloom filter does not include
901 the destination, since it is only
902 available for broadcast messages
903 which do not carry a destination
904 since they are undirected. */
908 case BUS_MATCH_VALUE:
910 case _BUS_MATCH_NODE_TYPE_MAX:
911 case _BUS_MATCH_NODE_TYPE_INVALID:
912 assert_not_reached("Invalid match type?");
917 sz += ALIGN8(offsetof(struct kdbus_item, data64) + BLOOM_SIZE);
927 item->size = offsetof(struct kdbus_item, data64) + BLOOM_SIZE;
928 item->type = KDBUS_MATCH_BLOOM;
929 memcpy(item->data64, bloom, BLOOM_SIZE);
931 item = KDBUS_PART_NEXT(item);
935 item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
936 item->type = KDBUS_MATCH_SRC_NAME;
937 memcpy(item->str, sender, sender_length + 1);
940 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
944 if (matches_name_change) {
946 /* If this match could theoretically match
947 * NameOwnerChanged messages, we need to
948 * install a second non-bloom filter explitly
951 r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
958 return sd_bus_call_method(
960 "org.freedesktop.DBus",
962 "org.freedesktop.DBus",
970 int bus_remove_match_internal(
980 if (bus->is_kernel) {
981 struct kdbus_cmd_match m;
984 m.size = offsetof(struct kdbus_cmd_match, items);
987 r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
994 return sd_bus_call_method(
996 "org.freedesktop.DBus",
998 "org.freedesktop.DBus",
1007 _public_ int sd_bus_get_owner_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
1008 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
1012 assert_return(bus, -EINVAL);
1013 assert_return(name, -EINVAL);
1014 assert_return(machine, -EINVAL);
1015 assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
1016 assert_return(!bus_pid_changed(bus), -ECHILD);
1018 if (streq_ptr(name, bus->unique_name))
1019 return sd_id128_get_machine(machine);
1021 r = sd_bus_message_new_method_call(
1025 "org.freedesktop.DBus.Peer",
1026 "GetMachineId", &m);
1030 r = sd_bus_message_set_no_auto_start(m, true);
1034 r = sd_bus_call(bus, m, 0, NULL, &reply);
1038 r = sd_bus_message_read(reply, "s", &mid);
1042 return sd_id128_from_string(mid, machine);