diff options
Diffstat (limited to 'src/libsystemd/sd-login/sd-login.c')
| -rw-r--r-- | src/libsystemd/sd-login/sd-login.c | 870 |
1 files changed, 870 insertions, 0 deletions
diff --git a/src/libsystemd/sd-login/sd-login.c b/src/libsystemd/sd-login/sd-login.c new file mode 100644 index 0000000000..d24b2ed1fd --- /dev/null +++ b/src/libsystemd/sd-login/sd-login.c @@ -0,0 +1,870 @@ +/*-*- 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 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 <unistd.h> +#include <string.h> +#include <errno.h> +#include <sys/inotify.h> +#include <sys/poll.h> + +#include "util.h" +#include "cgroup-util.h" +#include "macro.h" +#include "strv.h" +#include "fileio.h" +#include "login-shared.h" +#include "sd-login.h" + +_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_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_peer_get_session(int fd, char **session) { + struct ucred ucred; + int r; + + assert_return(fd >= 0, -EINVAL); + 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, -EINVAL); + 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, -EINVAL); + 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, -EINVAL); + 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, -EINVAL); + 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, -EINVAL); + assert_return(slice, -EINVAL); + + r = getpeercred(fd, &ucred); + if (r < 0) + return r; + + return cg_pid_get_slice(ucred.pid, slice); +} + +_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); + + if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0) + return -ENOMEM; + + r = parse_env_file(p, NEWLINE, "STATE", &s, NULL); + if (r == -ENOENT) { + free(s); + s = strdup("offline"); + if (!s) + return -ENOMEM; + + } 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 *w, *state; + _cleanup_free_ char *t = NULL, *s = NULL, *p = NULL; + size_t l; + int r; + const char *variable; + + assert_return(seat, -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); + + if (r < 0) + return r; + + if (!s) + return -EIO; + + if (asprintf(&t, "%lu", (unsigned long) uid) < 0) + return -ENOMEM; + + FOREACH_WORD(w, l, s, state) { + if (strneq(t, w, 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; + + if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) uid) < 0) + return -ENOMEM; + + r = parse_env_file(p, NEWLINE, + variable, &s, + NULL); + if (r < 0) { + if (r == -ENOENT) { + if (array) + *array = NULL; + return 0; + } + + return r; + } + + if (!s) { + if (array) + *array = NULL; + return 0; + } + + 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) { + int r; + _cleanup_free_ char *p = NULL, *s = NULL; + + r = file_of_session(session, &p); + if (r < 0) + return r; + + r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL); + if (r < 0) + return r; + + if (!s) + return -EIO; + + return parse_boolean(s); +} + +_public_ int sd_session_is_remote(const char *session) { + int r; + _cleanup_free_ char *p = NULL, *s = NULL; + + r = file_of_session(session, &p); + if (r < 0) + return r; + + r = parse_env_file(p, NEWLINE, "REMOTE", &s, NULL); + if (r < 0) + return r; + + if (!s) + return -EIO; + + 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 < 0) + return r; + else if (!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 < 0) + return r; + + if (!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); + + r = file_of_session(session, &p); + if (r < 0) + return r; + + r = parse_env_file(p, NEWLINE, field, &s, NULL); + + if (r < 0) + return r; + + if (isempty(s)) + return -ENOENT; + + *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; + + 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_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); +} + +static int file_of_seat(const char *seat, char **_p) { + char *p; + int r; + + assert(_p); + + if (seat) + 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_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 < 0) + return r; + + if (session && !s) + return -ENOENT; + + if (uid && !t) + return -ENOENT; + + 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 < 0) + return r; + + if (s) { + a = strv_split(s, " "); + if (!a) + return -ENOMEM; + } + + if (uids && t) { + char *w, *state; + size_t l; + + FOREACH_WORD(w, l, t, state) + n++; + + if (n > 0) { + unsigned i = 0; + + b = new(uid_t, n); + if (!b) + return -ENOMEM; + + FOREACH_WORD(w, l, t, state) { + _cleanup_free_ char *k = NULL; + + k = strndup(w, 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_return(variable, -EINVAL); + + r = file_of_seat(seat, &p); + if (r < 0) + return r; + + r = parse_env_file(p, NEWLINE, + variable, &s, + NULL); + if (r < 0) + return r; + if (!s) + return 0; + + 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:")) + 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(filename_is_safe(machine), -EINVAL); + assert_return(class, -EINVAL); + + p = strappenda("/run/systemd/machines/", machine); + r = parse_env_file(p, NEWLINE, "CLASS", &c, NULL); + if (r < 0) + return r; + if (!c) + return -EIO; + + *class = c; + c = NULL; + + return 0; +} + +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) { + 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 (!category || streq(category, "machine")) { + k = inotify_add_watch(fd, "/run/systemd/machines/", 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; + + assert_return(m, 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; +} |