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|
/***
This file is part of systemd.
Copyright 2011 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 <errno.h>
#include <poll.h>
#include <string.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <systemd/sd-login.h>
#include "basic/alloc-util.h"
#include "basic/cgroup-util.h"
#include "basic/dirent-util.h"
#include "basic/escape.h"
#include "basic/fd-util.h"
#include "basic/fileio.h"
#include "basic/formats-util.h"
#include "basic/fs-util.h"
#include "basic/hostname-util.h"
#include "basic/io-util.h"
#include "basic/login-util.h"
#include "basic/macro.h"
#include "basic/parse-util.h"
#include "basic/path-util.h"
#include "basic/socket-util.h"
#include "basic/string-util.h"
#include "basic/strv.h"
#include "basic/user-util.h"
#include "basic/util.h"
/* Error codes:
*
* invalid input parameters → -EINVAL
* invalid fd → -EBADF
* process does not exist → -ESRCH
* cgroup does not exist → -ENOENT
* machine, session does not exist → -ENXIO
* requested metadata on object is missing → -ENODATA
*/
_public_ int sd_pid_get_session(pid_t pid, char **session) {
assert_return(pid >= 0, -EINVAL);
assert_return(session, -EINVAL);
return cg_pid_get_session(pid, session);
}
_public_ int sd_pid_get_unit(pid_t pid, char **unit) {
assert_return(pid >= 0, -EINVAL);
assert_return(unit, -EINVAL);
return cg_pid_get_unit(pid, unit);
}
_public_ int sd_pid_get_user_unit(pid_t pid, char **unit) {
assert_return(pid >= 0, -EINVAL);
assert_return(unit, -EINVAL);
return cg_pid_get_user_unit(pid, unit);
}
_public_ int sd_pid_get_machine_name(pid_t pid, char **name) {
assert_return(pid >= 0, -EINVAL);
assert_return(name, -EINVAL);
return cg_pid_get_machine_name(pid, name);
}
_public_ int sd_pid_get_slice(pid_t pid, char **slice) {
assert_return(pid >= 0, -EINVAL);
assert_return(slice, -EINVAL);
return cg_pid_get_slice(pid, slice);
}
_public_ int sd_pid_get_user_slice(pid_t pid, char **slice) {
assert_return(pid >= 0, -EINVAL);
assert_return(slice, -EINVAL);
return cg_pid_get_user_slice(pid, slice);
}
_public_ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid) {
assert_return(pid >= 0, -EINVAL);
assert_return(uid, -EINVAL);
return cg_pid_get_owner_uid(pid, uid);
}
_public_ int sd_pid_get_cgroup(pid_t pid, char **cgroup) {
char *c;
int r;
assert_return(pid >= 0, -EINVAL);
assert_return(cgroup, -EINVAL);
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &c);
if (r < 0)
return r;
/* The internal APIs return the empty string for the root
* cgroup, let's return the "/" in the public APIs instead, as
* that's easier and less ambigious for people to grok. */
if (isempty(c)) {
free(c);
c = strdup("/");
if (!c)
return -ENOMEM;
}
*cgroup = c;
return 0;
}
_public_ int sd_peer_get_session(int fd, char **session) {
struct ucred ucred = {};
int r;
assert_return(fd >= 0, -EBADF);
assert_return(session, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return cg_pid_get_session(ucred.pid, session);
}
_public_ int sd_peer_get_owner_uid(int fd, uid_t *uid) {
struct ucred ucred;
int r;
assert_return(fd >= 0, -EBADF);
assert_return(uid, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return cg_pid_get_owner_uid(ucred.pid, uid);
}
_public_ int sd_peer_get_unit(int fd, char **unit) {
struct ucred ucred;
int r;
assert_return(fd >= 0, -EBADF);
assert_return(unit, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return cg_pid_get_unit(ucred.pid, unit);
}
_public_ int sd_peer_get_user_unit(int fd, char **unit) {
struct ucred ucred;
int r;
assert_return(fd >= 0, -EBADF);
assert_return(unit, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return cg_pid_get_user_unit(ucred.pid, unit);
}
_public_ int sd_peer_get_machine_name(int fd, char **machine) {
struct ucred ucred;
int r;
assert_return(fd >= 0, -EBADF);
assert_return(machine, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return cg_pid_get_machine_name(ucred.pid, machine);
}
_public_ int sd_peer_get_slice(int fd, char **slice) {
struct ucred ucred;
int r;
assert_return(fd >= 0, -EBADF);
assert_return(slice, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return cg_pid_get_slice(ucred.pid, slice);
}
_public_ int sd_peer_get_user_slice(int fd, char **slice) {
struct ucred ucred;
int r;
assert_return(fd >= 0, -EBADF);
assert_return(slice, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return cg_pid_get_user_slice(ucred.pid, slice);
}
_public_ int sd_peer_get_cgroup(int fd, char **cgroup) {
struct ucred ucred;
int r;
assert_return(fd >= 0, -EBADF);
assert_return(cgroup, -EINVAL);
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
return sd_pid_get_cgroup(ucred.pid, cgroup);
}
static int file_of_uid(uid_t uid, char **p) {
assert_return(uid_is_valid(uid), -EINVAL);
assert(p);
if (asprintf(p, "/run/systemd/users/" UID_FMT, uid) < 0)
return -ENOMEM;
return 0;
}
_public_ int sd_uid_get_state(uid_t uid, char**state) {
_cleanup_free_ char *p = NULL;
char *s = NULL;
int r;
assert_return(state, -EINVAL);
r = file_of_uid(uid, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
if (r == -ENOENT) {
free(s);
s = strdup("offline");
if (!s)
return -ENOMEM;
}
if (r < 0) {
free(s);
return r;
}
if (isempty(s)) {
free(s);
return -EIO;
}
*state = s;
return 0;
}
_public_ int sd_uid_get_display(uid_t uid, char **session) {
_cleanup_free_ char *p = NULL, *s = NULL;
int r;
assert_return(session, -EINVAL);
r = file_of_uid(uid, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "DISPLAY", &s, NULL);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*session = s;
s = NULL;
return 0;
}
static int file_of_seat(const char *seat, char **_p) {
char *p;
int r;
assert(_p);
if (seat) {
if (!filename_is_valid(seat))
return -EINVAL;
p = strappend("/run/systemd/seats/", seat);
} else {
_cleanup_free_ char *buf = NULL;
r = sd_session_get_seat(NULL, &buf);
if (r < 0)
return r;
p = strappend("/run/systemd/seats/", buf);
}
if (!p)
return -ENOMEM;
*_p = p;
p = NULL;
return 0;
}
_public_ int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat) {
_cleanup_free_ char *t = NULL, *s = NULL, *p = NULL;
size_t l;
int r;
const char *word, *variable, *state;
assert_return(uid_is_valid(uid), -EINVAL);
r = file_of_seat(seat, &p);
if (r < 0)
return r;
variable = require_active ? "ACTIVE_UID" : "UIDS";
r = parse_env_file(p, NEWLINE, variable, &s, NULL);
if (r == -ENOENT)
return 0;
if (r < 0)
return r;
if (isempty(s))
return 0;
if (asprintf(&t, UID_FMT, uid) < 0)
return -ENOMEM;
FOREACH_WORD(word, l, s, state)
if (strneq(t, word, l))
return 1;
return 0;
}
static int uid_get_array(uid_t uid, const char *variable, char ***array) {
_cleanup_free_ char *p = NULL, *s = NULL;
char **a;
int r;
assert(variable);
r = file_of_uid(uid, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, variable, &s, NULL);
if (r == -ENOENT || (r >= 0 && isempty(s))) {
if (array)
*array = NULL;
return 0;
}
if (r < 0)
return r;
a = strv_split(s, " ");
if (!a)
return -ENOMEM;
strv_uniq(a);
r = strv_length(a);
if (array)
*array = a;
else
strv_free(a);
return r;
}
_public_ int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions) {
return uid_get_array(
uid,
require_active == 0 ? "ONLINE_SESSIONS" :
require_active > 0 ? "ACTIVE_SESSIONS" :
"SESSIONS",
sessions);
}
_public_ int sd_uid_get_seats(uid_t uid, int require_active, char ***seats) {
return uid_get_array(
uid,
require_active == 0 ? "ONLINE_SEATS" :
require_active > 0 ? "ACTIVE_SEATS" :
"SEATS",
seats);
}
static int file_of_session(const char *session, char **_p) {
char *p;
int r;
assert(_p);
if (session) {
if (!session_id_valid(session))
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
} else {
_cleanup_free_ char *buf = NULL;
r = sd_pid_get_session(0, &buf);
if (r < 0)
return r;
p = strappend("/run/systemd/sessions/", buf);
}
if (!p)
return -ENOMEM;
*_p = p;
return 0;
}
_public_ int sd_session_is_active(const char *session) {
_cleanup_free_ char *p = NULL, *s = NULL;
int r;
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (isempty(s))
return -EIO;
return parse_boolean(s);
}
_public_ int sd_session_is_remote(const char *session) {
_cleanup_free_ char *p = NULL, *s = NULL;
int r;
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "REMOTE", &s, NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
return parse_boolean(s);
}
_public_ int sd_session_get_state(const char *session, char **state) {
_cleanup_free_ char *p = NULL, *s = NULL;
int r;
assert_return(state, -EINVAL);
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (isempty(s))
return -EIO;
*state = s;
s = NULL;
return 0;
}
_public_ int sd_session_get_uid(const char *session, uid_t *uid) {
int r;
_cleanup_free_ char *p = NULL, *s = NULL;
assert_return(uid, -EINVAL);
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (isempty(s))
return -EIO;
return parse_uid(s, uid);
}
static int session_get_string(const char *session, const char *field, char **value) {
_cleanup_free_ char *p = NULL, *s = NULL;
int r;
assert_return(value, -EINVAL);
assert(field);
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, field, &s, NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
*value = s;
s = NULL;
return 0;
}
_public_ int sd_session_get_seat(const char *session, char **seat) {
return session_get_string(session, "SEAT", seat);
}
_public_ int sd_session_get_tty(const char *session, char **tty) {
return session_get_string(session, "TTY", tty);
}
_public_ int sd_session_get_vt(const char *session, unsigned *vtnr) {
_cleanup_free_ char *vtnr_string = NULL;
unsigned u;
int r;
assert_return(vtnr, -EINVAL);
r = session_get_string(session, "VTNR", &vtnr_string);
if (r < 0)
return r;
r = safe_atou(vtnr_string, &u);
if (r < 0)
return r;
*vtnr = u;
return 0;
}
_public_ int sd_session_get_service(const char *session, char **service) {
return session_get_string(session, "SERVICE", service);
}
_public_ int sd_session_get_type(const char *session, char **type) {
return session_get_string(session, "TYPE", type);
}
_public_ int sd_session_get_class(const char *session, char **class) {
return session_get_string(session, "CLASS", class);
}
_public_ int sd_session_get_desktop(const char *session, char **desktop) {
_cleanup_free_ char *escaped = NULL;
char *t;
int r;
assert_return(desktop, -EINVAL);
r = session_get_string(session, "DESKTOP", &escaped);
if (r < 0)
return r;
r = cunescape(escaped, 0, &t);
if (r < 0)
return r;
*desktop = t;
return 0;
}
_public_ int sd_session_get_display(const char *session, char **display) {
return session_get_string(session, "DISPLAY", display);
}
_public_ int sd_session_get_remote_user(const char *session, char **remote_user) {
return session_get_string(session, "REMOTE_USER", remote_user);
}
_public_ int sd_session_get_remote_host(const char *session, char **remote_host) {
return session_get_string(session, "REMOTE_HOST", remote_host);
}
_public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
_cleanup_free_ char *p = NULL, *s = NULL, *t = NULL;
int r;
assert_return(session || uid, -EINVAL);
r = file_of_seat(seat, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE,
"ACTIVE", &s,
"ACTIVE_UID", &t,
NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (session && !s)
return -ENODATA;
if (uid && !t)
return -ENODATA;
if (uid && t) {
r = parse_uid(t, uid);
if (r < 0)
return r;
}
if (session && s) {
*session = s;
s = NULL;
}
return 0;
}
_public_ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uids, unsigned *n_uids) {
_cleanup_free_ char *p = NULL, *s = NULL, *t = NULL;
_cleanup_strv_free_ char **a = NULL;
_cleanup_free_ uid_t *b = NULL;
unsigned n = 0;
int r;
r = file_of_seat(seat, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE,
"SESSIONS", &s,
"ACTIVE_SESSIONS", &t,
NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (s) {
a = strv_split(s, " ");
if (!a)
return -ENOMEM;
}
if (uids && t) {
const char *word, *state;
size_t l;
FOREACH_WORD(word, l, t, state)
n++;
if (n > 0) {
unsigned i = 0;
b = new(uid_t, n);
if (!b)
return -ENOMEM;
FOREACH_WORD(word, l, t, state) {
_cleanup_free_ char *k = NULL;
k = strndup(word, l);
if (!k)
return -ENOMEM;
r = parse_uid(k, b + i);
if (r < 0)
continue;
i++;
}
}
}
r = strv_length(a);
if (sessions) {
*sessions = a;
a = NULL;
}
if (uids) {
*uids = b;
b = NULL;
}
if (n_uids)
*n_uids = n;
return r;
}
static int seat_get_can(const char *seat, const char *variable) {
_cleanup_free_ char *p = NULL, *s = NULL;
int r;
assert(variable);
r = file_of_seat(seat, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE,
variable, &s,
NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
return parse_boolean(s);
}
_public_ int sd_seat_can_multi_session(const char *seat) {
return seat_get_can(seat, "CAN_MULTI_SESSION");
}
_public_ int sd_seat_can_tty(const char *seat) {
return seat_get_can(seat, "CAN_TTY");
}
_public_ int sd_seat_can_graphical(const char *seat) {
return seat_get_can(seat, "CAN_GRAPHICAL");
}
_public_ int sd_get_seats(char ***seats) {
return get_files_in_directory("/run/systemd/seats/", seats);
}
_public_ int sd_get_sessions(char ***sessions) {
return get_files_in_directory("/run/systemd/sessions/", sessions);
}
_public_ int sd_get_uids(uid_t **users) {
_cleanup_closedir_ DIR *d;
int r = 0;
unsigned n = 0;
_cleanup_free_ uid_t *l = NULL;
d = opendir("/run/systemd/users/");
if (!d)
return -errno;
for (;;) {
struct dirent *de;
int k;
uid_t uid;
errno = 0;
de = readdir(d);
if (!de && errno > 0)
return -errno;
if (!de)
break;
dirent_ensure_type(d, de);
if (!dirent_is_file(de))
continue;
k = parse_uid(de->d_name, &uid);
if (k < 0)
continue;
if (users) {
if ((unsigned) r >= n) {
uid_t *t;
n = MAX(16, 2*r);
t = realloc(l, sizeof(uid_t) * n);
if (!t)
return -ENOMEM;
l = t;
}
assert((unsigned) r < n);
l[r++] = uid;
} else
r++;
}
if (users) {
*users = l;
l = NULL;
}
return r;
}
_public_ int sd_get_machine_names(char ***machines) {
char **l = NULL, **a, **b;
int r;
assert_return(machines, -EINVAL);
r = get_files_in_directory("/run/systemd/machines/", &l);
if (r < 0)
return r;
if (l) {
r = 0;
/* Filter out the unit: symlinks */
for (a = l, b = l; *a; a++) {
if (startswith(*a, "unit:") || !machine_name_is_valid(*a))
free(*a);
else {
*b = *a;
b++;
r++;
}
}
*b = NULL;
}
*machines = l;
return r;
}
_public_ int sd_machine_get_class(const char *machine, char **class) {
_cleanup_free_ char *c = NULL;
const char *p;
int r;
assert_return(machine_name_is_valid(machine), -EINVAL);
assert_return(class, -EINVAL);
p = strjoina("/run/systemd/machines/", machine);
r = parse_env_file(p, NEWLINE, "CLASS", &c, NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (!c)
return -EIO;
*class = c;
c = NULL;
return 0;
}
_public_ int sd_machine_get_ifindices(const char *machine, int **ifindices) {
_cleanup_free_ char *netif = NULL;
size_t l, allocated = 0, nr = 0;
int *ni = NULL;
const char *p, *word, *state;
int r;
assert_return(machine_name_is_valid(machine), -EINVAL);
assert_return(ifindices, -EINVAL);
p = strjoina("/run/systemd/machines/", machine);
r = parse_env_file(p, NEWLINE, "NETIF", &netif, NULL);
if (r == -ENOENT)
return -ENXIO;
if (r < 0)
return r;
if (!netif) {
*ifindices = NULL;
return 0;
}
FOREACH_WORD(word, l, netif, state) {
char buf[l+1];
int ifi;
*(char*) (mempcpy(buf, word, l)) = 0;
if (parse_ifindex(buf, &ifi) < 0)
continue;
if (!GREEDY_REALLOC(ni, allocated, nr+1)) {
free(ni);
return -ENOMEM;
}
ni[nr++] = ifi;
}
*ifindices = ni;
return nr;
}
static inline int MONITOR_TO_FD(sd_login_monitor *m) {
return (int) (unsigned long) m - 1;
}
static inline sd_login_monitor* FD_TO_MONITOR(int fd) {
return (sd_login_monitor*) (unsigned long) (fd + 1);
}
_public_ int sd_login_monitor_new(const char *category, sd_login_monitor **m) {
int fd, k;
bool good = false;
assert_return(m, -EINVAL);
fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
if (fd < 0)
return -errno;
if (!category || streq(category, "seat")) {
k = inotify_add_watch(fd, "/run/systemd/seats/", IN_MOVED_TO|IN_DELETE);
if (k < 0) {
safe_close(fd);
return -errno;
}
good = true;
}
if (!category || streq(category, "session")) {
k = inotify_add_watch(fd, "/run/systemd/sessions/", IN_MOVED_TO|IN_DELETE);
if (k < 0) {
safe_close(fd);
return -errno;
}
good = true;
}
if (!category || streq(category, "uid")) {
k = inotify_add_watch(fd, "/run/systemd/users/", IN_MOVED_TO|IN_DELETE);
if (k < 0) {
safe_close(fd);
return -errno;
}
good = true;
}
if (!category || streq(category, "machine")) {
k = inotify_add_watch(fd, "/run/systemd/machines/", IN_MOVED_TO|IN_DELETE);
if (k < 0) {
safe_close(fd);
return -errno;
}
good = true;
}
if (!good) {
close_nointr(fd);
return -EINVAL;
}
*m = FD_TO_MONITOR(fd);
return 0;
}
_public_ sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m) {
int fd;
if (!m)
return NULL;
fd = MONITOR_TO_FD(m);
close_nointr(fd);
return NULL;
}
_public_ int sd_login_monitor_flush(sd_login_monitor *m) {
assert_return(m, -EINVAL);
return flush_fd(MONITOR_TO_FD(m));
}
_public_ int sd_login_monitor_get_fd(sd_login_monitor *m) {
assert_return(m, -EINVAL);
return MONITOR_TO_FD(m);
}
_public_ int sd_login_monitor_get_events(sd_login_monitor *m) {
assert_return(m, -EINVAL);
/* For now we will only return POLLIN here, since we don't
* need anything else ever for inotify. However, let's have
* this API to keep our options open should we later on need
* it. */
return POLLIN;
}
_public_ int sd_login_monitor_get_timeout(sd_login_monitor *m, uint64_t *timeout_usec) {
assert_return(m, -EINVAL);
assert_return(timeout_usec, -EINVAL);
/* For now we will only return (uint64_t) -1, since we don't
* need any timeout. However, let's have this API to keep our
* options open should we later on need it. */
*timeout_usec = (uint64_t) -1;
return 0;
}
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