summaryrefslogtreecommitdiff
path: root/src/login/sd-login.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/login/sd-login.c')
-rw-r--r--src/login/sd-login.c726
1 files changed, 726 insertions, 0 deletions
diff --git a/src/login/sd-login.c b/src/login/sd-login.c
new file mode 100644
index 0000000000..a0a56c4952
--- /dev/null
+++ b/src/login/sd-login.c
@@ -0,0 +1,726 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/inotify.h>
+
+#include "util.h"
+#include "cgroup-util.h"
+#include "macro.h"
+#include "sd-login.h"
+#include "strv.h"
+
+static int pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
+ char *cg_process, *cg_init, *p;
+ int r;
+
+ if (pid == 0)
+ pid = getpid();
+
+ if (pid <= 0)
+ return -EINVAL;
+
+ r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
+ if (r < 0)
+ return r;
+
+ r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
+ if (r < 0) {
+ free(cg_process);
+ return r;
+ }
+
+ if (endswith(cg_init, "/system"))
+ cg_init[strlen(cg_init)-7] = 0;
+ else if (streq(cg_init, "/"))
+ cg_init[0] = 0;
+
+ if (startswith(cg_process, cg_init))
+ p = cg_process + strlen(cg_init);
+ else
+ p = cg_process;
+
+ free(cg_init);
+
+ if (cgroup) {
+ char* c;
+
+ c = strdup(p);
+ if (!c) {
+ free(cg_process);
+ return -ENOMEM;
+ }
+
+ *cgroup = c;
+ }
+
+ if (root) {
+ cg_process[p-cg_process] = 0;
+ *root = cg_process;
+ } else
+ free(cg_process);
+
+ return 0;
+}
+
+_public_ int sd_pid_get_session(pid_t pid, char **session) {
+ int r;
+ char *cgroup, *p;
+
+ if (!session)
+ return -EINVAL;
+
+ r = pid_get_cgroup(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ if (!startswith(cgroup, "/user/")) {
+ free(cgroup);
+ return -ENOENT;
+ }
+
+ p = strchr(cgroup + 6, '/');
+ if (!p) {
+ free(cgroup);
+ return -ENOENT;
+ }
+
+ p++;
+ if (startswith(p, "shared/") || streq(p, "shared")) {
+ free(cgroup);
+ return -ENOENT;
+ }
+
+ p = strndup(p, strcspn(p, "/"));
+ free(cgroup);
+
+ if (!p)
+ return -ENOMEM;
+
+ *session = p;
+ return 0;
+}
+
+_public_ int sd_pid_get_owner_uid(pid_t pid, uid_t *uid) {
+ int r;
+ char *root, *cgroup, *p, *cc;
+ struct stat st;
+
+ if (!uid)
+ return -EINVAL;
+
+ r = pid_get_cgroup(pid, &root, &cgroup);
+ if (r < 0)
+ return r;
+
+ if (!startswith(cgroup, "/user/")) {
+ free(cgroup);
+ free(root);
+ return -ENOENT;
+ }
+
+ p = strchr(cgroup + 6, '/');
+ if (!p) {
+ free(cgroup);
+ return -ENOENT;
+ }
+
+ p++;
+ p += strcspn(p, "/");
+ *p = 0;
+
+ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, cgroup, &cc);
+ free(root);
+ free(cgroup);
+
+ if (r < 0)
+ return -ENOMEM;
+
+ r = lstat(cc, &st);
+ free(cc);
+
+ if (r < 0)
+ return -errno;
+
+ if (!S_ISDIR(st.st_mode))
+ return -ENOTDIR;
+
+ *uid = st.st_uid;
+ return 0;
+}
+
+_public_ int sd_uid_get_state(uid_t uid, char**state) {
+ char *p, *s = NULL;
+ int r;
+
+ if (!state)
+ return -EINVAL;
+
+ if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
+ free(p);
+
+ if (r == -ENOENT) {
+ free(s);
+ s = strdup("offline");
+ if (!s)
+ return -ENOMEM;
+
+ *state = s;
+ return 0;
+ } else if (r < 0) {
+ free(s);
+ return r;
+ } else if (!s)
+ return -EIO;
+
+ *state = s;
+ return 0;
+}
+
+_public_ int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat) {
+ char *p, *w, *t, *state, *s = NULL;
+ size_t l;
+ int r;
+ const char *variable;
+
+ if (!seat)
+ return -EINVAL;
+
+ variable = require_active ? "ACTIVE_UID" : "UIDS";
+
+ p = strappend("/run/systemd/seats/", seat);
+ if (!p)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE, variable, &s, NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ return r;
+ }
+
+ if (!s)
+ return -EIO;
+
+ if (asprintf(&t, "%lu", (unsigned long) uid) < 0) {
+ free(s);
+ return -ENOMEM;
+ }
+
+ FOREACH_WORD(w, l, s, state) {
+ if (strncmp(t, w, l) == 0) {
+ free(s);
+ free(t);
+
+ return 1;
+ }
+ }
+
+ free(s);
+ free(t);
+
+ return 0;
+}
+
+static int uid_get_array(uid_t uid, const char *variable, char ***array) {
+ char *p, *s = NULL;
+ char **a;
+ int r;
+
+ if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE,
+ variable, &s,
+ NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+
+ if (r == -ENOENT) {
+ if (array)
+ *array = NULL;
+ return 0;
+ }
+
+ return r;
+ }
+
+ if (!s) {
+ if (array)
+ *array = NULL;
+ return 0;
+ }
+
+ a = strv_split(s, " ");
+ free(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 ? "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 ? "ACTIVE_SEATS" : "SEATS", seats);
+}
+
+_public_ int sd_session_is_active(const char *session) {
+ int r;
+ char *p, *s = NULL;
+
+ if (!session)
+ return -EINVAL;
+
+ p = strappend("/run/systemd/sessions/", session);
+ if (!p)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ return r;
+ }
+
+ if (!s)
+ return -EIO;
+
+ r = parse_boolean(s);
+ free(s);
+
+ return r;
+}
+
+_public_ int sd_session_get_uid(const char *session, uid_t *uid) {
+ int r;
+ char *p, *s = NULL;
+
+ if (!session)
+ return -EINVAL;
+ if (!uid)
+ return -EINVAL;
+
+ p = strappend("/run/systemd/sessions/", session);
+ if (!p)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ return r;
+ }
+
+ if (!s)
+ return -EIO;
+
+ r = parse_uid(s, uid);
+ free(s);
+
+ return r;
+}
+
+_public_ int sd_session_get_seat(const char *session, char **seat) {
+ char *p, *s = NULL;
+ int r;
+
+ if (!session)
+ return -EINVAL;
+ if (!seat)
+ return -EINVAL;
+
+ p = strappend("/run/systemd/sessions/", session);
+ if (!p)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE, "SEAT", &s, NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ return r;
+ }
+
+ if (isempty(s))
+ return -ENOENT;
+
+ *seat = s;
+ return 0;
+}
+
+_public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
+ char *p, *s = NULL, *t = NULL;
+ int r;
+
+ if (!seat)
+ return -EINVAL;
+ if (!session && !uid)
+ return -EINVAL;
+
+ p = strappend("/run/systemd/seats/", seat);
+ if (!p)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE,
+ "ACTIVE", &s,
+ "ACTIVE_UID", &t,
+ NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ free(t);
+ return r;
+ }
+
+ if (session && !s) {
+ free(t);
+ return -ENOENT;
+ }
+
+ if (uid && !t) {
+ free(s);
+ return -ENOENT;
+ }
+
+ if (uid && t) {
+ r = parse_uid(t, uid);
+ if (r < 0) {
+ free(t);
+ free(s);
+ return r;
+ }
+ }
+
+ free(t);
+
+ if (session && s)
+ *session = s;
+ else
+ free(s);
+
+ return 0;
+}
+
+_public_ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uids, unsigned *n_uids) {
+ char *p, *s = NULL, *t = NULL, **a = NULL;
+ uid_t *b = NULL;
+ unsigned n = 0;
+ int r;
+
+ if (!seat)
+ return -EINVAL;
+
+ p = strappend("/run/systemd/seats/", seat);
+ if (!p)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE,
+ "SESSIONS", &s,
+ "ACTIVE_SESSIONS", &t,
+ NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ free(t);
+ return r;
+ }
+
+ if (s) {
+ a = strv_split(s, " ");
+ if (!a) {
+ free(s);
+ free(t);
+ return -ENOMEM;
+ }
+ }
+
+ free(s);
+
+ if (uids && t) {
+ char *w, *state;
+ size_t l;
+
+ FOREACH_WORD(w, l, t, state)
+ n++;
+
+ if (n == 0)
+ b = NULL;
+ else {
+ unsigned i = 0;
+
+ b = new(uid_t, n);
+ if (!b) {
+ strv_free(a);
+ return -ENOMEM;
+ }
+
+ FOREACH_WORD(w, l, t, state) {
+ char *k;
+
+ k = strndup(w, l);
+ if (!k) {
+ free(t);
+ free(b);
+ strv_free(a);
+ return -ENOMEM;
+ }
+
+ r = parse_uid(k, b + i);
+ free(k);
+ if (r < 0)
+ continue;
+
+ i++;
+ }
+ }
+ }
+
+ free(t);
+
+ r = strv_length(a);
+
+ if (sessions)
+ *sessions = a;
+ else
+ strv_free(a);
+
+ if (uids)
+ *uids = b;
+
+ if (n_uids)
+ *n_uids = n;
+
+ return r;
+}
+
+_public_ int sd_seat_can_multi_session(const char *seat) {
+ char *p, *s = NULL;
+ int r;
+
+ if (!seat)
+ return -EINVAL;
+
+ p = strappend("/run/systemd/seats/", seat);
+ if (!p)
+ return -ENOMEM;
+
+ r = parse_env_file(p, NEWLINE,
+ "IS_VTCONSOLE", &s,
+ NULL);
+ free(p);
+
+ if (r < 0) {
+ free(s);
+ return r;
+ }
+
+ if (s) {
+ r = parse_boolean(s);
+ free(s);
+ } else
+ r = 0;
+
+ return r;
+}
+
+_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) {
+ DIR *d;
+ int r = 0;
+ unsigned n = 0;
+ uid_t *l = NULL;
+
+ d = opendir("/run/systemd/users/");
+ if (!d)
+ return -errno;
+
+ for (;;) {
+ struct dirent buffer, *de;
+ int k;
+ uid_t uid;
+
+ k = readdir_r(d, &buffer, &de);
+ if (k != 0) {
+ r = -k;
+ goto finish;
+ }
+
+ 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) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ l = t;
+ }
+
+ assert((unsigned) r < n);
+ l[r++] = uid;
+ } else
+ r++;
+ }
+
+finish:
+ if (d)
+ closedir(d);
+
+ if (r >= 0) {
+ if (users)
+ *users = l;
+ } else
+ free(l);
+
+ return r;
+}
+
+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;
+
+ if (!m)
+ return -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) {
+ close_nointr_nofail(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) {
+ close_nointr_nofail(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) {
+ close_nointr_nofail(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) {
+
+ if (!m)
+ return -EINVAL;
+
+ return flush_fd(MONITOR_TO_FD(m));
+}
+
+_public_ int sd_login_monitor_get_fd(sd_login_monitor *m) {
+
+ if (!m)
+ return -EINVAL;
+
+ return MONITOR_TO_FD(m);
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-08 08:07:51 +0000