diff options
Diffstat (limited to 'src/login/logind.c')
| -rw-r--r-- | src/login/logind.c | 1680 |
1 files changed, 1680 insertions, 0 deletions
diff --git a/src/login/logind.c b/src/login/logind.c new file mode 100644 index 0000000000..9cce481340 --- /dev/null +++ b/src/login/logind.c @@ -0,0 +1,1680 @@ +/*-*- 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 <errno.h> +#include <pwd.h> +#include <libudev.h> +#include <fcntl.h> +#include <string.h> +#include <unistd.h> +#include <sys/epoll.h> +#include <sys/ioctl.h> +#include <linux/vt.h> + +#include <systemd/sd-daemon.h> + +#include "logind.h" +#include "dbus-common.h" +#include "dbus-loop.h" +#include "strv.h" +#include "conf-parser.h" + +Manager *manager_new(void) { + Manager *m; + + m = new0(Manager, 1); + if (!m) + return NULL; + + m->console_active_fd = -1; + m->bus_fd = -1; + m->udev_seat_fd = -1; + m->udev_vcsa_fd = -1; + m->udev_button_fd = -1; + m->epoll_fd = -1; + m->reserve_vt_fd = -1; + + m->n_autovts = 6; + m->reserve_vt = 6; + m->inhibit_delay_max = 5 * USEC_PER_SEC; + m->handle_power_key = HANDLE_POWEROFF; + m->handle_suspend_key = HANDLE_SUSPEND; + m->handle_hibernate_key = HANDLE_HIBERNATE; + m->handle_lid_switch = HANDLE_SUSPEND; + m->lid_switch_ignore_inhibited = true; + + m->devices = hashmap_new(string_hash_func, string_compare_func); + m->seats = hashmap_new(string_hash_func, string_compare_func); + m->sessions = hashmap_new(string_hash_func, string_compare_func); + m->users = hashmap_new(trivial_hash_func, trivial_compare_func); + m->inhibitors = hashmap_new(string_hash_func, string_compare_func); + m->buttons = hashmap_new(string_hash_func, string_compare_func); + + m->user_cgroups = hashmap_new(string_hash_func, string_compare_func); + m->session_cgroups = hashmap_new(string_hash_func, string_compare_func); + + m->session_fds = hashmap_new(trivial_hash_func, trivial_compare_func); + m->inhibitor_fds = hashmap_new(trivial_hash_func, trivial_compare_func); + m->button_fds = hashmap_new(trivial_hash_func, trivial_compare_func); + + if (!m->devices || !m->seats || !m->sessions || !m->users || !m->inhibitors || !m->buttons || + !m->user_cgroups || !m->session_cgroups || + !m->session_fds || !m->inhibitor_fds || !m->button_fds) { + manager_free(m); + return NULL; + } + + m->reset_controllers = strv_new("cpu", NULL); + m->kill_exclude_users = strv_new("root", NULL); + if (!m->reset_controllers || !m->kill_exclude_users) { + manager_free(m); + return NULL; + } + + m->udev = udev_new(); + if (!m->udev) { + manager_free(m); + return NULL; + } + + if (cg_get_user_path(&m->cgroup_path) < 0) { + manager_free(m); + return NULL; + } + + return m; +} + +void manager_free(Manager *m) { + Session *session; + User *u; + Device *d; + Seat *s; + Inhibitor *i; + Button *b; + + assert(m); + + while ((session = hashmap_first(m->sessions))) + session_free(session); + + while ((u = hashmap_first(m->users))) + user_free(u); + + while ((d = hashmap_first(m->devices))) + device_free(d); + + while ((s = hashmap_first(m->seats))) + seat_free(s); + + while ((i = hashmap_first(m->inhibitors))) + inhibitor_free(i); + + while ((b = hashmap_first(m->buttons))) + button_free(b); + + hashmap_free(m->devices); + hashmap_free(m->seats); + hashmap_free(m->sessions); + hashmap_free(m->users); + hashmap_free(m->inhibitors); + hashmap_free(m->buttons); + + hashmap_free(m->user_cgroups); + hashmap_free(m->session_cgroups); + + hashmap_free(m->session_fds); + hashmap_free(m->inhibitor_fds); + hashmap_free(m->button_fds); + + if (m->console_active_fd >= 0) + close_nointr_nofail(m->console_active_fd); + + if (m->udev_seat_monitor) + udev_monitor_unref(m->udev_seat_monitor); + if (m->udev_vcsa_monitor) + udev_monitor_unref(m->udev_vcsa_monitor); + if (m->udev_button_monitor) + udev_monitor_unref(m->udev_button_monitor); + + if (m->udev) + udev_unref(m->udev); + + if (m->bus) { + dbus_connection_flush(m->bus); + dbus_connection_close(m->bus); + dbus_connection_unref(m->bus); + } + + if (m->bus_fd >= 0) + close_nointr_nofail(m->bus_fd); + + if (m->epoll_fd >= 0) + close_nointr_nofail(m->epoll_fd); + + if (m->reserve_vt_fd >= 0) + close_nointr_nofail(m->reserve_vt_fd); + + strv_free(m->controllers); + strv_free(m->reset_controllers); + strv_free(m->kill_only_users); + strv_free(m->kill_exclude_users); + + free(m->cgroup_path); + free(m); +} + +int manager_add_device(Manager *m, const char *sysfs, Device **_device) { + Device *d; + + assert(m); + assert(sysfs); + + d = hashmap_get(m->devices, sysfs); + if (d) { + if (_device) + *_device = d; + + return 0; + } + + d = device_new(m, sysfs); + if (!d) + return -ENOMEM; + + if (_device) + *_device = d; + + return 0; +} + +int manager_add_seat(Manager *m, const char *id, Seat **_seat) { + Seat *s; + + assert(m); + assert(id); + + s = hashmap_get(m->seats, id); + if (s) { + if (_seat) + *_seat = s; + + return 0; + } + + s = seat_new(m, id); + if (!s) + return -ENOMEM; + + if (_seat) + *_seat = s; + + return 0; +} + +int manager_add_session(Manager *m, User *u, const char *id, Session **_session) { + Session *s; + + assert(m); + assert(id); + + s = hashmap_get(m->sessions, id); + if (s) { + if (_session) + *_session = s; + + return 0; + } + + s = session_new(m, u, id); + if (!s) + return -ENOMEM; + + if (_session) + *_session = s; + + return 0; +} + +int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user) { + User *u; + + assert(m); + assert(name); + + u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid)); + if (u) { + if (_user) + *_user = u; + + return 0; + } + + u = user_new(m, uid, gid, name); + if (!u) + return -ENOMEM; + + if (_user) + *_user = u; + + return 0; +} + +int manager_add_user_by_name(Manager *m, const char *name, User **_user) { + uid_t uid; + gid_t gid; + int r; + + assert(m); + assert(name); + + r = get_user_creds(&name, &uid, &gid, NULL, NULL); + if (r < 0) + return r; + + return manager_add_user(m, uid, gid, name, _user); +} + +int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user) { + struct passwd *p; + + assert(m); + + errno = 0; + p = getpwuid(uid); + if (!p) + return errno ? -errno : -ENOENT; + + return manager_add_user(m, uid, p->pw_gid, p->pw_name, _user); +} + +int manager_add_inhibitor(Manager *m, const char* id, Inhibitor **_inhibitor) { + Inhibitor *i; + + assert(m); + assert(id); + + i = hashmap_get(m->inhibitors, id); + if (i) { + if (_inhibitor) + *_inhibitor = i; + + return 0; + } + + i = inhibitor_new(m, id); + if (!i) + return -ENOMEM; + + if (_inhibitor) + *_inhibitor = i; + + return 0; +} + +int manager_add_button(Manager *m, const char *name, Button **_button) { + Button *b; + + assert(m); + assert(name); + + b = hashmap_get(m->buttons, name); + if (b) { + if (_button) + *_button = b; + + return 0; + } + + b = button_new(m, name); + if (!b) + return -ENOMEM; + + if (_button) + *_button = b; + + return 0; +} + +int manager_process_seat_device(Manager *m, struct udev_device *d) { + Device *device; + int r; + + assert(m); + + if (streq_ptr(udev_device_get_action(d), "remove")) { + + device = hashmap_get(m->devices, udev_device_get_syspath(d)); + if (!device) + return 0; + + seat_add_to_gc_queue(device->seat); + device_free(device); + + } else { + const char *sn; + Seat *seat; + + sn = udev_device_get_property_value(d, "ID_SEAT"); + if (isempty(sn)) + sn = "seat0"; + + if (!seat_name_is_valid(sn)) { + log_warning("Device with invalid seat name %s found, ignoring.", sn); + return 0; + } + + r = manager_add_device(m, udev_device_get_syspath(d), &device); + if (r < 0) + return r; + + r = manager_add_seat(m, sn, &seat); + if (r < 0) { + if (!device->seat) + device_free(device); + + return r; + } + + device_attach(device, seat); + seat_start(seat); + } + + return 0; +} + +int manager_process_button_device(Manager *m, struct udev_device *d) { + Button *b; + + int r; + + assert(m); + + if (streq_ptr(udev_device_get_action(d), "remove")) { + + b = hashmap_get(m->buttons, udev_device_get_sysname(d)); + if (!b) + return 0; + + button_free(b); + + } else { + const char *sn; + + r = manager_add_button(m, udev_device_get_sysname(d), &b); + if (r < 0) + return r; + + sn = udev_device_get_property_value(d, "ID_SEAT"); + if (isempty(sn)) + sn = "seat0"; + + button_set_seat(b, sn); + button_open(b); + } + + return 0; +} + +int manager_enumerate_devices(Manager *m) { + struct udev_list_entry *item = NULL, *first = NULL; + struct udev_enumerate *e; + int r; + + assert(m); + + /* Loads devices from udev and creates seats for them as + * necessary */ + + e = udev_enumerate_new(m->udev); + if (!e) { + r = -ENOMEM; + goto finish; + } + + r = udev_enumerate_add_match_subsystem(e, "graphics"); + if (r < 0) + goto finish; + + r = udev_enumerate_add_match_tag(e, "seat"); + if (r < 0) + goto finish; + + r = udev_enumerate_scan_devices(e); + if (r < 0) + goto finish; + + first = udev_enumerate_get_list_entry(e); + udev_list_entry_foreach(item, first) { + struct udev_device *d; + int k; + + d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item)); + if (!d) { + r = -ENOMEM; + goto finish; + } + + k = manager_process_seat_device(m, d); + udev_device_unref(d); + + if (k < 0) + r = k; + } + +finish: + if (e) + udev_enumerate_unref(e); + + return r; +} + +int manager_enumerate_buttons(Manager *m) { + struct udev_list_entry *item = NULL, *first = NULL; + struct udev_enumerate *e; + int r; + + assert(m); + + /* Loads buttons from udev */ + + if (m->handle_power_key == HANDLE_IGNORE && + m->handle_suspend_key == HANDLE_IGNORE && + m->handle_hibernate_key == HANDLE_IGNORE && + m->handle_lid_switch == HANDLE_IGNORE) + return 0; + + e = udev_enumerate_new(m->udev); + if (!e) { + r = -ENOMEM; + goto finish; + } + + r = udev_enumerate_add_match_subsystem(e, "input"); + if (r < 0) + goto finish; + + r = udev_enumerate_add_match_tag(e, "power-switch"); + if (r < 0) + goto finish; + + r = udev_enumerate_scan_devices(e); + if (r < 0) + goto finish; + + first = udev_enumerate_get_list_entry(e); + udev_list_entry_foreach(item, first) { + struct udev_device *d; + int k; + + d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item)); + if (!d) { + r = -ENOMEM; + goto finish; + } + + k = manager_process_button_device(m, d); + udev_device_unref(d); + + if (k < 0) + r = k; + } + +finish: + if (e) + udev_enumerate_unref(e); + + return r; +} + +int manager_enumerate_seats(Manager *m) { + DIR *d; + struct dirent *de; + int r = 0; + + assert(m); + + /* This loads data about seats stored on disk, but does not + * actually create any seats. Removes data of seats that no + * longer exist. */ + + d = opendir("/run/systemd/seats"); + if (!d) { + if (errno == ENOENT) + return 0; + + log_error("Failed to open /run/systemd/seats: %m"); + return -errno; + } + + while ((de = readdir(d))) { + Seat *s; + int k; + + if (!dirent_is_file(de)) + continue; + + s = hashmap_get(m->seats, de->d_name); + if (!s) { + unlinkat(dirfd(d), de->d_name, 0); + continue; + } + + k = seat_load(s); + if (k < 0) + r = k; + } + + closedir(d); + + return r; +} + +static int manager_enumerate_users_from_cgroup(Manager *m) { + int r = 0, k; + char *name; + DIR *d; + + r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &d); + if (r < 0) { + if (r == -ENOENT) + return 0; + + log_error("Failed to open %s: %s", m->cgroup_path, strerror(-r)); + return r; + } + + while ((k = cg_read_subgroup(d, &name)) > 0) { + User *user; + + k = manager_add_user_by_name(m, name, &user); + if (k < 0) { + free(name); + r = k; + continue; + } + + user_add_to_gc_queue(user); + + if (!user->cgroup_path) + if (asprintf(&user->cgroup_path, "%s/%s", m->cgroup_path, name) < 0) { + r = -ENOMEM; + free(name); + break; + } + + free(name); + } + + if (r >= 0 && k < 0) + r = k; + + closedir(d); + + return r; +} + +static int manager_enumerate_linger_users(Manager *m) { + DIR *d; + struct dirent *de; + int r = 0; + + d = opendir("/var/lib/systemd/linger"); + if (!d) { + if (errno == ENOENT) + return 0; + + log_error("Failed to open /var/lib/systemd/linger/: %m"); + return -errno; + } + + while ((de = readdir(d))) { + int k; + + if (!dirent_is_file(de)) + continue; + + k = manager_add_user_by_name(m, de->d_name, NULL); + if (k < 0) { + log_notice("Couldn't add lingering user %s: %s", de->d_name, strerror(-k)); + r = k; + } + } + + closedir(d); + + return r; +} + +int manager_enumerate_users(Manager *m) { + DIR *d; + struct dirent *de; + int r, k; + + assert(m); + + /* First, enumerate user cgroups */ + r = manager_enumerate_users_from_cgroup(m); + + /* Second, add lingering users on top */ + k = manager_enumerate_linger_users(m); + if (k < 0) + r = k; + + /* Third, read in user data stored on disk */ + d = opendir("/run/systemd/users"); + if (!d) { + if (errno == ENOENT) + return 0; + + log_error("Failed to open /run/systemd/users: %m"); + return -errno; + } + + while ((de = readdir(d))) { + uid_t uid; + User *u; + + if (!dirent_is_file(de)) + continue; + + k = parse_uid(de->d_name, &uid); + if (k < 0) { + log_error("Failed to parse file name %s: %s", de->d_name, strerror(-k)); + continue; + } + + u = hashmap_get(m->users, ULONG_TO_PTR(uid)); + if (!u) { + unlinkat(dirfd(d), de->d_name, 0); + continue; + } + + k = user_load(u); + if (k < 0) + r = k; + } + + closedir(d); + + return r; +} + +static int manager_enumerate_sessions_from_cgroup(Manager *m) { + User *u; + Iterator i; + int r = 0; + + HASHMAP_FOREACH(u, m->users, i) { + DIR *d; + char *name; + int k; + + if (!u->cgroup_path) + continue; + + k = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &d); + if (k < 0) { + if (k == -ENOENT) + continue; + + log_error("Failed to open %s: %s", u->cgroup_path, strerror(-k)); + r = k; + continue; + } + + while ((k = cg_read_subgroup(d, &name)) > 0) { + Session *session; + + if (streq(name, "shared")) + continue; + + k = manager_add_session(m, u, name, &session); + if (k < 0) { + free(name); + break; + } + + session_add_to_gc_queue(session); + + if (!session->cgroup_path) + if (asprintf(&session->cgroup_path, "%s/%s", u->cgroup_path, name) < 0) { + k = -ENOMEM; + free(name); + break; + } + + free(name); + } + + closedir(d); + + if (k < 0) + r = k; + } + + return r; +} + +int manager_enumerate_sessions(Manager *m) { + DIR *d; + struct dirent *de; + int r = 0; + + assert(m); + + /* First enumerate session cgroups */ + r = manager_enumerate_sessions_from_cgroup(m); + + /* Second, read in session data stored on disk */ + d = opendir("/run/systemd/sessions"); + if (!d) { + if (errno == ENOENT) + return 0; + + log_error("Failed to open /run/systemd/sessions: %m"); + return -errno; + } + + while ((de = readdir(d))) { + struct Session *s; + int k; + + if (!dirent_is_file(de)) + continue; + + s = hashmap_get(m->sessions, de->d_name); + if (!s) { + unlinkat(dirfd(d), de->d_name, 0); + continue; + } + + k = session_load(s); + if (k < 0) + r = k; + } + + closedir(d); + + return r; +} + +int manager_enumerate_inhibitors(Manager *m) { + DIR *d; + struct dirent *de; + int r = 0; + + assert(m); + + d = opendir("/run/systemd/inhibit"); + if (!d) { + if (errno == ENOENT) + return 0; + + log_error("Failed to open /run/systemd/inhibit: %m"); + return -errno; + } + + while ((de = readdir(d))) { + int k; + Inhibitor *i; + + if (!dirent_is_file(de)) + continue; + + k = manager_add_inhibitor(m, de->d_name, &i); + if (k < 0) { + log_notice("Couldn't add inhibitor %s: %s", de->d_name, strerror(-k)); + r = k; + continue; + } + + k = inhibitor_load(i); + if (k < 0) + r = k; + } + + closedir(d); + + return r; +} + +int manager_dispatch_seat_udev(Manager *m) { + struct udev_device *d; + int r; + + assert(m); + + d = udev_monitor_receive_device(m->udev_seat_monitor); + if (!d) + return -ENOMEM; + + r = manager_process_seat_device(m, d); + udev_device_unref(d); + + return r; +} + +int manager_dispatch_vcsa_udev(Manager *m) { + struct udev_device *d; + int r = 0; + const char *name; + + assert(m); + + d = udev_monitor_receive_device(m->udev_vcsa_monitor); + if (!d) + return -ENOMEM; + + name = udev_device_get_sysname(d); + + /* Whenever a VCSA device is removed try to reallocate our + * VTs, to make sure our auto VTs never go away. */ + + if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove")) + r = seat_preallocate_vts(m->vtconsole); + + udev_device_unref(d); + + return r; +} + +int manager_dispatch_button_udev(Manager *m) { + struct udev_device *d; + int r; + + assert(m); + + d = udev_monitor_receive_device(m->udev_button_monitor); + if (!d) + return -ENOMEM; + + r = manager_process_button_device(m, d); + udev_device_unref(d); + + return r; +} + +int manager_dispatch_console(Manager *m) { + assert(m); + + if (m->vtconsole) + seat_read_active_vt(m->vtconsole); + + return 0; +} + +static int vt_is_busy(int vtnr) { + struct vt_stat vt_stat; + int r = 0, fd; + + assert(vtnr >= 1); + + /* We explicitly open /dev/tty1 here instead of /dev/tty0. If + * we'd open the latter we'd open the foreground tty which + * hence would be unconditionally busy. By opening /dev/tty1 + * we avoid this. Since tty1 is special and needs to be an + * explicitly loaded getty or DM this is safe. */ + + fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) + return -errno; + + if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0) + r = -errno; + else + r = !!(vt_stat.v_state & (1 << vtnr)); + + close_nointr_nofail(fd); + + return r; +} + +int manager_spawn_autovt(Manager *m, int vtnr) { + int r; + char *name = NULL; + const char *mode = "fail"; + + assert(m); + assert(vtnr >= 1); + + if ((unsigned) vtnr > m->n_autovts && + (unsigned) vtnr != m->reserve_vt) + return 0; + + if ((unsigned) vtnr != m->reserve_vt) { + /* If this is the reserved TTY, we'll start the getty + * on it in any case, but otherwise only if it is not + * busy. */ + + r = vt_is_busy(vtnr); + if (r < 0) + return r; + else if (r > 0) + return -EBUSY; + } + + if (asprintf(&name, "autovt@tty%i.service", vtnr) < 0) { + log_error("Could not allocate service name."); + r = -ENOMEM; + goto finish; + } + + r = bus_method_call_with_reply ( + m->bus, + "org.freedesktop.systemd1", + "/org/freedesktop/systemd1", + "org.freedesktop.systemd1.Manager", + "StartUnit", + NULL, + NULL, + DBUS_TYPE_STRING, &name, + DBUS_TYPE_STRING, &mode, + DBUS_TYPE_INVALID); + +finish: + free(name); + + return r; +} + +static int manager_reserve_vt(Manager *m) { + _cleanup_free_ char *p = NULL; + + assert(m); + + if (m->reserve_vt <= 0) + return 0; + + if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0) + return log_oom(); + + m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); + if (m->reserve_vt_fd < 0) { + + /* Don't complain on VT-less systems */ + if (errno != ENOENT) + log_warning("Failed to pin reserved VT: %m"); + return -errno; + } + + return 0; +} + +int manager_get_session_by_cgroup(Manager *m, const char *cgroup, Session **session) { + Session *s; + char *p; + + assert(m); + assert(cgroup); + assert(session); + + s = hashmap_get(m->session_cgroups, cgroup); + if (s) { + *session = s; + return 1; + } + + p = strdup(cgroup); + if (!p) + return log_oom(); + + for (;;) { + char *e; + + e = strrchr(p, '/'); + if (!e || e == p) { + free(p); + *session = NULL; + return 0; + } + + *e = 0; + + s = hashmap_get(m->session_cgroups, p); + if (s) { + free(p); + *session = s; + return 1; + } + } +} + +int manager_get_user_by_cgroup(Manager *m, const char *cgroup, User **user) { + User *u; + char *p; + + assert(m); + assert(cgroup); + assert(user); + + u = hashmap_get(m->user_cgroups, cgroup); + if (u) { + *user = u; + return 1; + } + + p = strdup(cgroup); + if (!p) + return log_oom(); + + for (;;) { + char *e; + + e = strrchr(p, '/'); + if (!e || e == p) { + free(p); + *user = NULL; + return 0; + } + + *e = 0; + + u = hashmap_get(m->user_cgroups, p); + if (u) { + free(p); + *user = u; + return 1; + } + } +} + +int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session) { + char *p; + int r; + + assert(m); + assert(pid >= 1); + assert(session); + + r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &p); + if (r < 0) + return r; + + r = manager_get_session_by_cgroup(m, p, session); + free(p); + + return r; +} + +void manager_cgroup_notify_empty(Manager *m, const char *cgroup) { + Session *s; + User *u; + int r; + + r = manager_get_session_by_cgroup(m, cgroup, &s); + if (r > 0) + session_add_to_gc_queue(s); + + r = manager_get_user_by_cgroup(m, cgroup, &u); + if (r > 0) + user_add_to_gc_queue(u); +} + +static void manager_dispatch_other(Manager *m, int fd) { + Session *s; + Inhibitor *i; + Button *b; + + assert_se(m); + assert_se(fd >= 0); + + s = hashmap_get(m->session_fds, INT_TO_PTR(fd + 1)); + if (s) { + assert(s->fifo_fd == fd); + session_remove_fifo(s); + session_stop(s); + return; + } + + i = hashmap_get(m->inhibitor_fds, INT_TO_PTR(fd + 1)); + if (i) { + assert(i->fifo_fd == fd); + inhibitor_stop(i); + inhibitor_free(i); + return; + } + + b = hashmap_get(m->button_fds, INT_TO_PTR(fd + 1)); + if (b) { + assert(b->fd == fd); + button_process(b); + return; + } + + assert_not_reached("Got event for unknown fd"); +} + +static int manager_connect_bus(Manager *m) { + DBusError error; + int r; + struct epoll_event ev; + + assert(m); + assert(!m->bus); + assert(m->bus_fd < 0); + + dbus_error_init(&error); + + m->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error); + if (!m->bus) { + log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error)); + r = -ECONNREFUSED; + goto fail; + } + + if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/login1", &bus_manager_vtable, m) || + !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/seat", &bus_seat_vtable, m) || + !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/session", &bus_session_vtable, m) || + !dbus_connection_register_fallback(m->bus, "/org/freedesktop/login1/user", &bus_user_vtable, m) || + !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL)) { + r = log_oom(); + goto fail; + } + + dbus_bus_add_match(m->bus, + "type='signal'," + "interface='org.freedesktop.systemd1.Agent'," + "member='Released'," + "path='/org/freedesktop/systemd1/agent'", + &error); + + if (dbus_error_is_set(&error)) { + log_error("Failed to register match: %s", bus_error_message(&error)); + r = -EIO; + goto fail; + } + + r = dbus_bus_request_name(m->bus, "org.freedesktop.login1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error); + if (dbus_error_is_set(&error)) { + log_error("Failed to register name on bus: %s", bus_error_message(&error)); + r = -EIO; + goto fail; + } + + if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) { + log_error("Failed to acquire name."); + r = -EEXIST; + goto fail; + } + + m->bus_fd = bus_loop_open(m->bus); + if (m->bus_fd < 0) { + r = m->bus_fd; + goto fail; + } + + zero(ev); + ev.events = EPOLLIN; + ev.data.u32 = FD_BUS; + + if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->bus_fd, &ev) < 0) + goto fail; + + return 0; + +fail: + dbus_error_free(&error); + + return r; +} + +static int manager_connect_console(Manager *m) { + struct epoll_event ev; + + assert(m); + assert(m->console_active_fd < 0); + + /* On certain architectures (S390 and Xen, and containers), + /dev/tty0 does not exist, so don't fail if we can't open + it. */ + if (access("/dev/tty0", F_OK) < 0) { + m->console_active_fd = -1; + return 0; + } + + m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC); + if (m->console_active_fd < 0) { + + /* On some systems the device node /dev/tty0 may exist + * even though /sys/class/tty/tty0 does not. */ + if (errno == ENOENT) + return 0; + + log_error("Failed to open /sys/class/tty/tty0/active: %m"); + return -errno; + } + + zero(ev); + ev.events = 0; + ev.data.u32 = FD_CONSOLE; + + if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->console_active_fd, &ev) < 0) + return -errno; + + return 0; +} + +static int manager_connect_udev(Manager *m) { + struct epoll_event ev; + int r; + + assert(m); + assert(!m->udev_seat_monitor); + assert(!m->udev_vcsa_monitor); + assert(!m->udev_button_monitor); + + m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); + if (!m->udev_seat_monitor) + return -ENOMEM; + + r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "seat"); + if (r < 0) + return r; + + r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_seat_monitor, "graphics", NULL); + if (r < 0) + return r; + + r = udev_monitor_enable_receiving(m->udev_seat_monitor); + if (r < 0) + return r; + + m->udev_seat_fd = udev_monitor_get_fd(m->udev_seat_monitor); + + zero(ev); + ev.events = EPOLLIN; + ev.data.u32 = FD_SEAT_UDEV; + if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_seat_fd, &ev) < 0) + return -errno; + + /* Don't watch keys if nobody cares */ + if (m->handle_power_key != HANDLE_IGNORE || + m->handle_suspend_key != HANDLE_IGNORE || + m->handle_hibernate_key != HANDLE_IGNORE || + m->handle_lid_switch != HANDLE_IGNORE) { + + m->udev_button_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); + if (!m->udev_button_monitor) + return -ENOMEM; + + r = udev_monitor_filter_add_match_tag(m->udev_button_monitor, "power-switch"); + if (r < 0) + return r; + + r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_button_monitor, "input", NULL); + if (r < 0) + return r; + + r = udev_monitor_enable_receiving(m->udev_button_monitor); + if (r < 0) + return r; + + m->udev_button_fd = udev_monitor_get_fd(m->udev_button_monitor); + + zero(ev); + ev.events = EPOLLIN; + ev.data.u32 = FD_BUTTON_UDEV; + if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_button_fd, &ev) < 0) + return -errno; + } + + /* Don't bother watching VCSA devices, if nobody cares */ + if (m->n_autovts > 0 && m->console_active_fd >= 0) { + + m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); + if (!m->udev_vcsa_monitor) + return -ENOMEM; + + r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL); + if (r < 0) + return r; + + r = udev_monitor_enable_receiving(m->udev_vcsa_monitor); + if (r < 0) + return r; + + m->udev_vcsa_fd = udev_monitor_get_fd(m->udev_vcsa_monitor); + + zero(ev); + ev.events = EPOLLIN; + ev.data.u32 = FD_VCSA_UDEV; + if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_vcsa_fd, &ev) < 0) + return -errno; + } + + return 0; +} + +void manager_gc(Manager *m, bool drop_not_started) { + Seat *seat; + Session *session; + User *user; + + assert(m); + + while ((seat = m->seat_gc_queue)) { + LIST_REMOVE(Seat, gc_queue, m->seat_gc_queue, seat); + seat->in_gc_queue = false; + + if (seat_check_gc(seat, drop_not_started) == 0) { + seat_stop(seat); + seat_free(seat); + } + } + + while ((session = m->session_gc_queue)) { + LIST_REMOVE(Session, gc_queue, m->session_gc_queue, session); + session->in_gc_queue = false; + + if (session_check_gc(session, drop_not_started) == 0) { + session_stop(session); + session_free(session); + } + } + + while ((user = m->user_gc_queue)) { + LIST_REMOVE(User, gc_queue, m->user_gc_queue, user); + user->in_gc_queue = false; + + if (user_check_gc(user, drop_not_started) == 0) { + user_stop(user); + user_free(user); + } + } +} + +int manager_get_idle_hint(Manager *m, dual_timestamp *t) { + Session *s; + bool idle_hint; + dual_timestamp ts = { 0, 0 }; + Iterator i; + + assert(m); + + idle_hint = !manager_is_inhibited(m, INHIBIT_IDLE, INHIBIT_BLOCK, t, false, false, 0); + + HASHMAP_FOREACH(s, m->sessions, i) { + dual_timestamp k; + int ih; + + ih = session_get_idle_hint(s, &k); + if (ih < 0) + return ih; + + if (!ih) { + if (!idle_hint) { + if (k.monotonic < ts.monotonic) + ts = k; + } else { + idle_hint = false; + ts = k; + } + } else if (idle_hint) { + + if (k.monotonic > ts.monotonic) + ts = k; + } + } + + if (t) + *t = ts; + + return idle_hint; +} + +int manager_startup(Manager *m) { + int r; + Seat *seat; + Session *session; + User *user; + Inhibitor *inhibitor; + Iterator i; + + assert(m); + assert(m->epoll_fd <= 0); + + cg_shorten_controllers(m->reset_controllers); + cg_shorten_controllers(m->controllers); + + m->epoll_fd = epoll_create1(EPOLL_CLOEXEC); + if (m->epoll_fd < 0) + return -errno; + + /* Connect to console */ + r = manager_connect_console(m); + if (r < 0) + return r; + + /* Connect to udev */ + r = manager_connect_udev(m); + if (r < 0) + return r; + + /* Connect to the bus */ + r = manager_connect_bus(m); + if (r < 0) + return r; + + /* Instantiate magic seat 0 */ + r = manager_add_seat(m, "seat0", &m->vtconsole); + if (r < 0) + return r; + + /* Deserialize state */ + manager_enumerate_devices(m); + manager_enumerate_seats(m); + manager_enumerate_users(m); + manager_enumerate_sessions(m); + manager_enumerate_inhibitors(m); + manager_enumerate_buttons(m); + + /* Remove stale objects before we start them */ + manager_gc(m, false); + + /* Reserve the special reserved VT */ + manager_reserve_vt(m); + + /* And start everything */ + HASHMAP_FOREACH(seat, m->seats, i) + seat_start(seat); + + HASHMAP_FOREACH(user, m->users, i) + user_start(user); + + HASHMAP_FOREACH(session, m->sessions, i) + session_start(session); + + HASHMAP_FOREACH(inhibitor, m->inhibitors, i) + inhibitor_start(inhibitor); + + return 0; +} + +static int manager_recheck_buttons(Manager *m) { + Iterator i; + Button *b; + int r = 0; + + assert(m); + + HASHMAP_FOREACH(b, m->buttons, i) { + int q; + + q = button_recheck(b); + if (q > 0) + return 1; + if (q < 0) + r = q; + } + + return r; +} + +int manager_run(Manager *m) { + assert(m); + + for (;;) { + struct epoll_event event; + int n; + int msec = -1; + + manager_gc(m, true); + + if (manager_dispatch_delayed(m) > 0) + continue; + + if (manager_recheck_buttons(m) > 0) + continue; + + if (dbus_connection_dispatch(m->bus) != DBUS_DISPATCH_COMPLETE) + continue; + + manager_gc(m, true); + + if (m->delayed_unit) { + usec_t x, y; + + x = now(CLOCK_MONOTONIC); + y = m->delayed_timestamp + m->inhibit_delay_max; + + msec = x >= y ? 0 : (int) ((y - x) / USEC_PER_MSEC); + } + + n = epoll_wait(m->epoll_fd, &event, 1, msec); + if (n < 0) { + if (errno == EINTR || errno == EAGAIN) + continue; + + log_error("epoll() failed: %m"); + return -errno; + } + + if (n == 0) + continue; + + switch (event.data.u32) { + + case FD_SEAT_UDEV: + manager_dispatch_seat_udev(m); + break; + + case FD_VCSA_UDEV: + manager_dispatch_vcsa_udev(m); + break; + + case FD_BUTTON_UDEV: + manager_dispatch_button_udev(m); + break; + + case FD_CONSOLE: + manager_dispatch_console(m); + break; + + case FD_BUS: + bus_loop_dispatch(m->bus_fd); + break; + + default: + if (event.data.u32 >= FD_OTHER_BASE) + manager_dispatch_other(m, event.data.u32 - FD_OTHER_BASE); + } + } + + return 0; +} + +static int manager_parse_config_file(Manager *m) { + FILE *f; + const char *fn; + int r; + + assert(m); + + fn = "/etc/systemd/logind.conf"; + f = fopen(fn, "re"); + if (!f) { + if (errno == ENOENT) + return 0; + + log_warning("Failed to open configuration file %s: %m", fn); + return -errno; + } + + r = config_parse(fn, f, "Login\0", config_item_perf_lookup, (void*) logind_gperf_lookup, false, m); + if (r < 0) + log_warning("Failed to parse configuration file: %s", strerror(-r)); + + fclose(f); + + return r; +} + +int main(int argc, char *argv[]) { + Manager *m = NULL; + int r; + + log_set_target(LOG_TARGET_AUTO); + log_set_facility(LOG_AUTH); + log_parse_environment(); + log_open(); + + umask(0022); + + if (argc != 1) { + log_error("This program takes no arguments."); + r = -EINVAL; + goto finish; + } + + m = manager_new(); + if (!m) { + r = log_oom(); + goto finish; + } + + manager_parse_config_file(m); + + r = manager_startup(m); + if (r < 0) { + log_error("Failed to fully start up daemon: %s", strerror(-r)); + goto finish; + } + + log_debug("systemd-logind running as pid %lu", (unsigned long) getpid()); + + sd_notify(false, + "READY=1\n" + "STATUS=Processing requests..."); + + r = manager_run(m); + + log_debug("systemd-logind stopped as pid %lu", (unsigned long) getpid()); + +finish: + sd_notify(false, + "STATUS=Shutting down..."); + + if (m) + manager_free(m); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |