2 This file is part of systemd.
4 Copyright 2011 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/inotify.h>
28 #include "alloc-util.h"
29 #include "cgroup-util.h"
30 #include "dirent-util.h"
34 #include "format-util.h"
36 #include "hostname-util.h"
38 #include "login-util.h"
40 #include "parse-util.h"
41 #include "path-util.h"
42 #include "socket-util.h"
43 #include "string-util.h"
45 #include "user-util.h"
50 * invalid input parameters → -EINVAL
52 * process does not exist → -ESRCH
53 * cgroup does not exist → -ENOENT
54 * machine, session does not exist → -ENXIO
55 * requested metadata on object is missing → -ENODATA
58 _public_ int sd_pid_get_session(pid_t pid, char **session) {
61 assert_return(pid >= 0, -EINVAL);
62 assert_return(session, -EINVAL);
64 r = cg_pid_get_session(pid, session);
65 return r == -ENXIO ? -ENODATA : r;
68 _public_ int sd_pid_get_unit(pid_t pid, char **unit) {
70 assert_return(pid >= 0, -EINVAL);
71 assert_return(unit, -EINVAL);
73 #if 0 /// elogind does not support systemd units
74 return cg_pid_get_unit(pid, unit);
80 _public_ int sd_pid_get_user_unit(pid_t pid, char **unit) {
82 assert_return(pid >= 0, -EINVAL);
83 assert_return(unit, -EINVAL);
85 #if 0 /// elogind does not support systemd units
86 return cg_pid_get_user_unit(pid, unit);
92 _public_ int sd_pid_get_machine_name(pid_t pid, char **name) {
94 assert_return(pid >= 0, -EINVAL);
95 assert_return(name, -EINVAL);
97 #if 0 /// elogind does not support systemd units
98 return cg_pid_get_machine_name(pid, name);
104 _public_ int sd_pid_get_slice(pid_t pid, char **slice) {
106 assert_return(pid >= 0, -EINVAL);
107 assert_return(slice, -EINVAL);
109 #if 0 /// elogind does not support systemd slices
110 return cg_pid_get_slice(pid, slice);
116 _public_ int sd_pid_get_user_slice(pid_t pid, char **slice) {
118 assert_return(pid >= 0, -EINVAL);
119 assert_return(slice, -EINVAL);
121 #if 0 /// elogind does not support systemd slices
122 return cg_pid_get_user_slice(pid, slice);
128 _public_ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid) {
130 assert_return(pid >= 0, -EINVAL);
131 assert_return(uid, -EINVAL);
133 #if 0 /// elogind does not support systemd slices
134 return cg_pid_get_owner_uid(pid, uid);
140 _public_ int sd_pid_get_cgroup(pid_t pid, char **cgroup) {
144 assert_return(pid >= 0, -EINVAL);
145 assert_return(cgroup, -EINVAL);
147 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &c);
151 /* The internal APIs return the empty string for the root
152 * cgroup, let's return the "/" in the public APIs instead, as
153 * that's easier and less ambiguous for people to grok. */
166 _public_ int sd_peer_get_session(int fd, char **session) {
167 struct ucred ucred = {};
170 assert_return(fd >= 0, -EBADF);
171 assert_return(session, -EINVAL);
173 r = getpeercred(fd, &ucred);
177 #if 0 /// elogind does not support systemd scopes
178 return cg_pid_get_session(ucred.pid, session);
184 _public_ int sd_peer_get_owner_uid(int fd, uid_t *uid) {
188 assert_return(fd >= 0, -EBADF);
189 assert_return(uid, -EINVAL);
191 r = getpeercred(fd, &ucred);
195 #if 0 /// elogind does not support systemd units
196 return cg_pid_get_owner_uid(ucred.pid, uid);
202 _public_ int sd_peer_get_unit(int fd, char **unit) {
206 assert_return(fd >= 0, -EBADF);
207 assert_return(unit, -EINVAL);
209 r = getpeercred(fd, &ucred);
213 #if 0 /// elogind does not support systemd units
214 return cg_pid_get_unit(ucred.pid, unit);
220 _public_ int sd_peer_get_user_unit(int fd, char **unit) {
224 assert_return(fd >= 0, -EBADF);
225 assert_return(unit, -EINVAL);
227 r = getpeercred(fd, &ucred);
231 #if 0 /// elogind does not support systemd units
232 return cg_pid_get_user_unit(ucred.pid, unit);
238 _public_ int sd_peer_get_machine_name(int fd, char **machine) {
242 assert_return(fd >= 0, -EBADF);
243 assert_return(machine, -EINVAL);
245 r = getpeercred(fd, &ucred);
249 #if 0 /// elogind does not support systemd units
250 return cg_pid_get_machine_name(ucred.pid, machine);
256 _public_ int sd_peer_get_slice(int fd, char **slice) {
260 assert_return(fd >= 0, -EBADF);
261 assert_return(slice, -EINVAL);
263 r = getpeercred(fd, &ucred);
267 #if 0 /// elogind does not support systemd slices
268 return cg_pid_get_slice(ucred.pid, slice);
274 _public_ int sd_peer_get_user_slice(int fd, char **slice) {
278 assert_return(fd >= 0, -EBADF);
279 assert_return(slice, -EINVAL);
281 r = getpeercred(fd, &ucred);
285 #if 0 /// elogind does not support systemd slices
286 return cg_pid_get_user_slice(ucred.pid, slice);
292 _public_ int sd_peer_get_cgroup(int fd, char **cgroup) {
296 assert_return(fd >= 0, -EBADF);
297 assert_return(cgroup, -EINVAL);
299 r = getpeercred(fd, &ucred);
303 return sd_pid_get_cgroup(ucred.pid, cgroup);
306 static int file_of_uid(uid_t uid, char **p) {
308 assert_return(uid_is_valid(uid), -EINVAL);
311 if (asprintf(p, "/run/systemd/users/" UID_FMT, uid) < 0)
317 _public_ int sd_uid_get_state(uid_t uid, char**state) {
318 _cleanup_free_ char *p = NULL;
322 assert_return(state, -EINVAL);
324 r = file_of_uid(uid, &p);
328 r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
331 s = strdup("offline");
349 _public_ int sd_uid_get_display(uid_t uid, char **session) {
350 _cleanup_free_ char *p = NULL, *s = NULL;
353 assert_return(session, -EINVAL);
355 r = file_of_uid(uid, &p);
359 r = parse_env_file(p, NEWLINE, "DISPLAY", &s, NULL);
373 static int file_of_seat(const char *seat, char **_p) {
380 if (!filename_is_valid(seat))
383 p = strappend("/run/systemd/seats/", seat);
385 _cleanup_free_ char *buf = NULL;
387 r = sd_session_get_seat(NULL, &buf);
391 p = strappend("/run/systemd/seats/", buf);
402 _public_ int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat) {
403 _cleanup_free_ char *t = NULL, *s = NULL, *p = NULL;
406 const char *word, *variable, *state;
408 assert_return(uid_is_valid(uid), -EINVAL);
410 r = file_of_seat(seat, &p);
414 variable = require_active ? "ACTIVE_UID" : "UIDS";
416 r = parse_env_file(p, NEWLINE, variable, &s, NULL);
424 if (asprintf(&t, UID_FMT, uid) < 0)
427 FOREACH_WORD(word, l, s, state)
428 if (strneq(t, word, l))
434 static int uid_get_array(uid_t uid, const char *variable, char ***array) {
435 _cleanup_free_ char *p = NULL, *s = NULL;
441 r = file_of_uid(uid, &p);
445 r = parse_env_file(p, NEWLINE, variable, &s, NULL);
446 if (r == -ENOENT || (r >= 0 && isempty(s))) {
454 a = strv_split(s, " ");
469 _public_ int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions) {
470 return uid_get_array(
472 require_active == 0 ? "ONLINE_SESSIONS" :
473 require_active > 0 ? "ACTIVE_SESSIONS" :
478 _public_ int sd_uid_get_seats(uid_t uid, int require_active, char ***seats) {
479 return uid_get_array(
481 require_active == 0 ? "ONLINE_SEATS" :
482 require_active > 0 ? "ACTIVE_SEATS" :
487 static int file_of_session(const char *session, char **_p) {
494 if (!session_id_valid(session))
497 p = strappend("/run/systemd/sessions/", session);
499 _cleanup_free_ char *buf = NULL;
501 r = sd_pid_get_session(0, &buf);
505 p = strappend("/run/systemd/sessions/", buf);
515 _public_ int sd_session_is_active(const char *session) {
516 _cleanup_free_ char *p = NULL, *s = NULL;
519 r = file_of_session(session, &p);
523 r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
531 return parse_boolean(s);
534 _public_ int sd_session_is_remote(const char *session) {
535 _cleanup_free_ char *p = NULL, *s = NULL;
538 r = file_of_session(session, &p);
542 r = parse_env_file(p, NEWLINE, "REMOTE", &s, NULL);
550 return parse_boolean(s);
553 _public_ int sd_session_get_state(const char *session, char **state) {
554 _cleanup_free_ char *p = NULL, *s = NULL;
557 assert_return(state, -EINVAL);
559 r = file_of_session(session, &p);
563 r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
577 _public_ int sd_session_get_uid(const char *session, uid_t *uid) {
579 _cleanup_free_ char *p = NULL, *s = NULL;
581 assert_return(uid, -EINVAL);
583 r = file_of_session(session, &p);
587 r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
595 return parse_uid(s, uid);
598 static int session_get_string(const char *session, const char *field, char **value) {
599 _cleanup_free_ char *p = NULL, *s = NULL;
602 assert_return(value, -EINVAL);
605 r = file_of_session(session, &p);
609 r = parse_env_file(p, NEWLINE, field, &s, NULL);
622 _public_ int sd_session_get_seat(const char *session, char **seat) {
623 return session_get_string(session, "SEAT", seat);
626 _public_ int sd_session_get_tty(const char *session, char **tty) {
627 return session_get_string(session, "TTY", tty);
630 _public_ int sd_session_get_vt(const char *session, unsigned *vtnr) {
631 _cleanup_free_ char *vtnr_string = NULL;
635 assert_return(vtnr, -EINVAL);
637 r = session_get_string(session, "VTNR", &vtnr_string);
641 r = safe_atou(vtnr_string, &u);
649 _public_ int sd_session_get_service(const char *session, char **service) {
650 return session_get_string(session, "SERVICE", service);
653 _public_ int sd_session_get_type(const char *session, char **type) {
654 return session_get_string(session, "TYPE", type);
657 _public_ int sd_session_get_class(const char *session, char **class) {
658 return session_get_string(session, "CLASS", class);
661 _public_ int sd_session_get_desktop(const char *session, char **desktop) {
662 _cleanup_free_ char *escaped = NULL;
666 assert_return(desktop, -EINVAL);
668 r = session_get_string(session, "DESKTOP", &escaped);
672 r = cunescape(escaped, 0, &t);
680 _public_ int sd_session_get_display(const char *session, char **display) {
681 return session_get_string(session, "DISPLAY", display);
684 _public_ int sd_session_get_remote_user(const char *session, char **remote_user) {
685 return session_get_string(session, "REMOTE_USER", remote_user);
688 _public_ int sd_session_get_remote_host(const char *session, char **remote_host) {
689 return session_get_string(session, "REMOTE_HOST", remote_host);
692 _public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
693 _cleanup_free_ char *p = NULL, *s = NULL, *t = NULL;
696 assert_return(session || uid, -EINVAL);
698 r = file_of_seat(seat, &p);
702 r = parse_env_file(p, NEWLINE,
718 r = parse_uid(t, uid);
731 _public_ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uids, unsigned *n_uids) {
732 _cleanup_free_ char *p = NULL, *s = NULL, *t = NULL;
733 _cleanup_strv_free_ char **a = NULL;
734 _cleanup_free_ uid_t *b = NULL;
738 r = file_of_seat(seat, &p);
742 r = parse_env_file(p, NEWLINE,
752 a = strv_split(s, " ");
758 const char *word, *state;
761 FOREACH_WORD(word, l, t, state)
771 FOREACH_WORD(word, l, t, state) {
772 _cleanup_free_ char *k = NULL;
774 k = strndup(word, l);
778 r = parse_uid(k, b + i);
805 static int seat_get_can(const char *seat, const char *variable) {
806 _cleanup_free_ char *p = NULL, *s = NULL;
811 r = file_of_seat(seat, &p);
815 r = parse_env_file(p, NEWLINE,
825 return parse_boolean(s);
828 _public_ int sd_seat_can_multi_session(const char *seat) {
829 return seat_get_can(seat, "CAN_MULTI_SESSION");
832 _public_ int sd_seat_can_tty(const char *seat) {
833 return seat_get_can(seat, "CAN_TTY");
836 _public_ int sd_seat_can_graphical(const char *seat) {
837 return seat_get_can(seat, "CAN_GRAPHICAL");
840 _public_ int sd_get_seats(char ***seats) {
841 return get_files_in_directory("/run/systemd/seats/", seats);
844 _public_ int sd_get_sessions(char ***sessions) {
845 return get_files_in_directory("/run/systemd/sessions/", sessions);
848 _public_ int sd_get_uids(uid_t **users) {
849 _cleanup_closedir_ DIR *d;
853 _cleanup_free_ uid_t *l = NULL;
855 d = opendir("/run/systemd/users/");
859 FOREACH_DIRENT_ALL(de, d, return -errno) {
863 dirent_ensure_type(d, de);
865 if (!dirent_is_file(de))
868 k = parse_uid(de->d_name, &uid);
873 if ((unsigned) r >= n) {
877 t = realloc(l, sizeof(uid_t) * n);
884 assert((unsigned) r < n);
898 _public_ int sd_get_machine_names(char ***machines) {
899 char **l = NULL, **a, **b;
902 assert_return(machines, -EINVAL);
904 r = get_files_in_directory("/run/systemd/machines/", &l);
911 /* Filter out the unit: symlinks */
912 for (a = l, b = l; *a; a++) {
913 if (startswith(*a, "unit:") || !machine_name_is_valid(*a))
929 _public_ int sd_machine_get_class(const char *machine, char **class) {
930 _cleanup_free_ char *c = NULL;
934 assert_return(machine_name_is_valid(machine), -EINVAL);
935 assert_return(class, -EINVAL);
937 p = strjoina("/run/systemd/machines/", machine);
938 r = parse_env_file(p, NEWLINE, "CLASS", &c, NULL);
952 _public_ int sd_machine_get_ifindices(const char *machine, int **ifindices) {
953 _cleanup_free_ char *netif = NULL;
954 size_t l, allocated = 0, nr = 0;
956 const char *p, *word, *state;
959 assert_return(machine_name_is_valid(machine), -EINVAL);
960 assert_return(ifindices, -EINVAL);
962 p = strjoina("/run/systemd/machines/", machine);
963 r = parse_env_file(p, NEWLINE, "NETIF", &netif, NULL);
973 FOREACH_WORD(word, l, netif, state) {
977 *(char*) (mempcpy(buf, word, l)) = 0;
979 if (parse_ifindex(buf, &ifi) < 0)
982 if (!GREEDY_REALLOC(ni, allocated, nr+1)) {
994 static inline int MONITOR_TO_FD(sd_login_monitor *m) {
995 return (int) (unsigned long) m - 1;
998 static inline sd_login_monitor* FD_TO_MONITOR(int fd) {
999 return (sd_login_monitor*) (unsigned long) (fd + 1);
1002 _public_ int sd_login_monitor_new(const char *category, sd_login_monitor **m) {
1006 assert_return(m, -EINVAL);
1008 fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1012 if (!category || streq(category, "seat")) {
1013 k = inotify_add_watch(fd, "/run/systemd/seats/", IN_MOVED_TO|IN_DELETE);
1022 if (!category || streq(category, "session")) {
1023 k = inotify_add_watch(fd, "/run/systemd/sessions/", IN_MOVED_TO|IN_DELETE);
1032 if (!category || streq(category, "uid")) {
1033 k = inotify_add_watch(fd, "/run/systemd/users/", IN_MOVED_TO|IN_DELETE);
1042 if (!category || streq(category, "machine")) {
1043 k = inotify_add_watch(fd, "/run/systemd/machines/", IN_MOVED_TO|IN_DELETE);
1057 *m = FD_TO_MONITOR(fd);
1061 _public_ sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m) {
1067 fd = MONITOR_TO_FD(m);
1073 _public_ int sd_login_monitor_flush(sd_login_monitor *m) {
1075 assert_return(m, -EINVAL);
1077 return flush_fd(MONITOR_TO_FD(m));
1080 _public_ int sd_login_monitor_get_fd(sd_login_monitor *m) {
1082 assert_return(m, -EINVAL);
1084 return MONITOR_TO_FD(m);
1087 _public_ int sd_login_monitor_get_events(sd_login_monitor *m) {
1089 assert_return(m, -EINVAL);
1091 /* For now we will only return POLLIN here, since we don't
1092 * need anything else ever for inotify. However, let's have
1093 * this API to keep our options open should we later on need
1098 _public_ int sd_login_monitor_get_timeout(sd_login_monitor *m, uint64_t *timeout_usec) {
1100 assert_return(m, -EINVAL);
1101 assert_return(timeout_usec, -EINVAL);
1103 /* For now we will only return (uint64_t) -1, since we don't
1104 * need any timeout. However, let's have this API to keep our
1105 * options open should we later on need it. */
1106 *timeout_usec = (uint64_t) -1;