diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/login/logind-core.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/login/logind-core.c | 859 |
1 files changed, 859 insertions, 0 deletions
diff --git a/src/login/logind-core.c b/src/login/logind-core.c new file mode 100644 index 0000000..02adc81 --- /dev/null +++ b/src/login/logind-core.c @@ -0,0 +1,859 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <linux/vt.h> + +#include "sd-device.h" + +#include "alloc-util.h" +#include "bus-error.h" +#include "bus-util.h" +#include "cgroup-util.h" +#include "conf-parser.h" +#include "device-util.h" +#include "efi-loader.h" +#include "errno-util.h" +#include "fd-util.h" +#include "limits-util.h" +#include "logind.h" +#include "parse-util.h" +#include "path-util.h" +#include "process-util.h" +#include "stdio-util.h" +#include "strv.h" +#include "terminal-util.h" +#include "udev-util.h" +#include "user-util.h" +#include "userdb.h" +#include "utmp-wtmp.h" + +void manager_reset_config(Manager *m) { + assert(m); + + m->n_autovts = 6; + m->reserve_vt = 6; + m->remove_ipc = true; + m->inhibit_delay_max = 5 * USEC_PER_SEC; + m->user_stop_delay = 10 * USEC_PER_SEC; + + m->handle_power_key = HANDLE_POWEROFF; + m->handle_power_key_long_press = HANDLE_IGNORE; + m->handle_reboot_key = HANDLE_REBOOT; + m->handle_reboot_key_long_press = HANDLE_POWEROFF; + m->handle_suspend_key = HANDLE_SUSPEND; + m->handle_suspend_key_long_press = HANDLE_HIBERNATE; + m->handle_hibernate_key = HANDLE_HIBERNATE; + m->handle_hibernate_key_long_press = HANDLE_IGNORE; + + m->handle_lid_switch = HANDLE_SUSPEND; + m->handle_lid_switch_ep = _HANDLE_ACTION_INVALID; + m->handle_lid_switch_docked = HANDLE_IGNORE; + + m->power_key_ignore_inhibited = false; + m->suspend_key_ignore_inhibited = false; + m->hibernate_key_ignore_inhibited = false; + m->lid_switch_ignore_inhibited = true; + m->reboot_key_ignore_inhibited = false; + + m->holdoff_timeout_usec = 30 * USEC_PER_SEC; + + m->idle_action_usec = 30 * USEC_PER_MINUTE; + m->idle_action = HANDLE_IGNORE; + + m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */ + m->runtime_dir_inodes = DIV_ROUND_UP(m->runtime_dir_size, 4096); /* 4k per inode */ + m->sessions_max = 8192; + m->inhibitors_max = 8192; + + m->kill_user_processes = KILL_USER_PROCESSES; + + m->kill_only_users = strv_free(m->kill_only_users); + m->kill_exclude_users = strv_free(m->kill_exclude_users); + + m->stop_idle_session_usec = USEC_INFINITY; +} + +int manager_parse_config_file(Manager *m) { + assert(m); + + return config_parse_many_nulstr( + PKGSYSCONFDIR "/logind.conf", + CONF_PATHS_NULSTR("systemd/logind.conf.d"), + "Login\0", + config_item_perf_lookup, logind_gperf_lookup, + CONFIG_PARSE_WARN, m, + NULL); +} + +int manager_add_device(Manager *m, const char *sysfs, bool master, Device **ret_device) { + Device *d; + + assert(m); + assert(sysfs); + + d = hashmap_get(m->devices, sysfs); + if (d) + /* we support adding master-flags, but not removing them */ + d->master = d->master || master; + else { + d = device_new(m, sysfs, master); + if (!d) + return -ENOMEM; + } + + if (ret_device) + *ret_device = d; + + return 0; +} + +int manager_add_seat(Manager *m, const char *id, Seat **ret_seat) { + Seat *s; + int r; + + assert(m); + assert(id); + + s = hashmap_get(m->seats, id); + if (!s) { + r = seat_new(&s, m, id); + if (r < 0) + return r; + } + + if (ret_seat) + *ret_seat = s; + + return 0; +} + +int manager_add_session(Manager *m, const char *id, Session **ret_session) { + Session *s; + int r; + + assert(m); + assert(id); + + s = hashmap_get(m->sessions, id); + if (!s) { + r = session_new(&s, m, id); + if (r < 0) + return r; + } + + if (ret_session) + *ret_session = s; + + return 0; +} + +int manager_add_user( + Manager *m, + UserRecord *ur, + User **ret_user) { + + User *u; + int r; + + assert(m); + assert(ur); + + u = hashmap_get(m->users, UID_TO_PTR(ur->uid)); + if (!u) { + r = user_new(&u, m, ur); + if (r < 0) + return r; + } + + if (ret_user) + *ret_user = u; + + return 0; +} + +int manager_add_user_by_name( + Manager *m, + const char *name, + User **ret_user) { + + _cleanup_(user_record_unrefp) UserRecord *ur = NULL; + int r; + + assert(m); + assert(name); + + r = userdb_by_name(name, USERDB_SUPPRESS_SHADOW, &ur); + if (r < 0) + return r; + + return manager_add_user(m, ur, ret_user); +} + +int manager_add_user_by_uid( + Manager *m, + uid_t uid, + User **ret_user) { + + _cleanup_(user_record_unrefp) UserRecord *ur = NULL; + int r; + + assert(m); + assert(uid_is_valid(uid)); + + r = userdb_by_uid(uid, USERDB_SUPPRESS_SHADOW, &ur); + if (r < 0) + return r; + + return manager_add_user(m, ur, ret_user); +} + +int manager_add_inhibitor(Manager *m, const char* id, Inhibitor **ret) { + Inhibitor *i; + int r; + + assert(m); + assert(id); + + i = hashmap_get(m->inhibitors, id); + if (!i) { + r = inhibitor_new(&i, m, id); + if (r < 0) + return r; + } + + if (ret) + *ret = i; + + return 0; +} + +int manager_add_button(Manager *m, const char *name, Button **ret_button) { + Button *b; + + assert(m); + assert(name); + + b = hashmap_get(m->buttons, name); + if (!b) { + b = button_new(m, name); + if (!b) + return -ENOMEM; + } + + if (ret_button) + *ret_button = b; + + return 0; +} + +int manager_process_seat_device(Manager *m, sd_device *d) { + Device *device; + int r; + + assert(m); + + if (device_for_action(d, SD_DEVICE_REMOVE) || + sd_device_has_current_tag(d, "seat") <= 0) { + const char *syspath; + + r = sd_device_get_syspath(d, &syspath); + if (r < 0) + return 0; + + device = hashmap_get(m->devices, syspath); + if (!device) + return 0; + + seat_add_to_gc_queue(device->seat); + device_free(device); + + } else { + const char *sn, *syspath; + bool master; + Seat *seat; + + if (sd_device_get_property_value(d, "ID_SEAT", &sn) < 0 || isempty(sn)) + sn = "seat0"; + + if (!seat_name_is_valid(sn)) { + log_device_warning(d, "Device with invalid seat name %s found, ignoring.", sn); + return 0; + } + + seat = hashmap_get(m->seats, sn); + master = sd_device_has_current_tag(d, "master-of-seat") > 0; + + /* Ignore non-master devices for unknown seats */ + if (!master && !seat) + return 0; + + r = sd_device_get_syspath(d, &syspath); + if (r < 0) + return r; + + r = manager_add_device(m, syspath, master, &device); + if (r < 0) + return r; + + if (!seat) { + 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, sd_device *d) { + const char *sysname; + Button *b; + int r; + + assert(m); + + r = sd_device_get_sysname(d, &sysname); + if (r < 0) + return r; + + if (device_for_action(d, SD_DEVICE_REMOVE) || + sd_device_has_current_tag(d, "power-switch") <= 0) { + + b = hashmap_get(m->buttons, sysname); + if (!b) + return 0; + + button_free(b); + + } else { + const char *sn; + + r = manager_add_button(m, sysname, &b); + if (r < 0) + return r; + + if (sd_device_get_property_value(d, "ID_SEAT", &sn) < 0 || isempty(sn)) + sn = "seat0"; + + button_set_seat(b, sn); + + r = button_open(b); + if (r < 0) /* event device doesn't have any keys or switches relevant to us? (or any other error + * opening the device?) let's close the button again. */ + button_free(b); + } + + return 0; +} + +int manager_get_session_by_pid(Manager *m, pid_t pid, Session **ret) { + _cleanup_free_ char *unit = NULL; + Session *s; + int r; + + assert(m); + + if (!pid_is_valid(pid)) + return -EINVAL; + + s = hashmap_get(m->sessions_by_leader, PID_TO_PTR(pid)); + if (!s) { + r = cg_pid_get_unit(pid, &unit); + if (r >= 0) + s = hashmap_get(m->session_units, unit); + } + + if (ret) + *ret = s; + + return !!s; +} + +int manager_get_user_by_pid(Manager *m, pid_t pid, User **ret) { + _cleanup_free_ char *unit = NULL; + User *u = NULL; + int r; + + assert(m); + + if (!pid_is_valid(pid)) + return -EINVAL; + + r = cg_pid_get_slice(pid, &unit); + if (r >= 0) + u = hashmap_get(m->user_units, unit); + + if (ret) + *ret = u; + + return !!u; +} + +int manager_get_idle_hint(Manager *m, dual_timestamp *t) { + Session *s; + bool idle_hint; + dual_timestamp ts = DUAL_TIMESTAMP_NULL; + + assert(m); + + idle_hint = !manager_is_inhibited(m, INHIBIT_IDLE, INHIBIT_BLOCK, t, false, false, 0, NULL); + + HASHMAP_FOREACH(s, m->sessions) { + 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; +} + +bool manager_shall_kill(Manager *m, const char *user) { + assert(m); + assert(user); + + if (!m->kill_exclude_users && streq(user, "root")) + return false; + + if (strv_contains(m->kill_exclude_users, user)) + return false; + + if (!strv_isempty(m->kill_only_users)) + return strv_contains(m->kill_only_users, user); + + return m->kill_user_processes; +} + +int config_parse_n_autovts( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + unsigned *n = ASSERT_PTR(data); + unsigned o; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + r = safe_atou(rvalue, &o); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse number of autovts, ignoring: %s", rvalue); + return 0; + } + + if (o > 15) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "A maximum of 15 autovts are supported, ignoring: %s", rvalue); + return 0; + } + + *n = o; + return 0; +} + +static int vt_is_busy(unsigned vtnr) { + struct vt_stat vt_stat; + int r; + _cleanup_close_ int fd = -1; + + assert(vtnr >= 1); + + /* VT_GETSTATE "cannot return state for more than 16 VTs, since v_state is short" */ + assert(vtnr <= 15); + + /* 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)); + + return r; +} + +int manager_spawn_autovt(Manager *m, unsigned vtnr) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + char name[sizeof("autovt@tty.service") + DECIMAL_STR_MAX(unsigned)]; + int r; + + assert(m); + assert(vtnr >= 1); + + if (vtnr > m->n_autovts && + vtnr != m->reserve_vt) + return 0; + + if (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; + } + + xsprintf(name, "autovt@tty%u.service", vtnr); + r = sd_bus_call_method( + m->bus, + "org.freedesktop.systemd1", + "/org/freedesktop/systemd1", + "org.freedesktop.systemd1.Manager", + "StartUnit", + &error, + NULL, + "ss", name, "fail"); + if (r < 0) + return log_error_errno(r, "Failed to start %s: %s", name, bus_error_message(&error, r)); + + return 0; +} + +bool manager_is_lid_closed(Manager *m) { + Button *b; + + HASHMAP_FOREACH(b, m->buttons) + if (b->lid_closed) + return true; + + return false; +} + +static bool manager_is_docked(Manager *m) { + Button *b; + + HASHMAP_FOREACH(b, m->buttons) + if (b->docked) + return true; + + return false; +} + +static int manager_count_external_displays(Manager *m) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + sd_device *d; + int r, n = 0; + + r = sd_device_enumerator_new(&e); + if (r < 0) + return r; + + r = sd_device_enumerator_allow_uninitialized(e); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_subsystem(e, "drm", true); + if (r < 0) + return r; + + FOREACH_DEVICE(e, d) { + const char *status, *enabled, *dash, *nn, *subsys; + sd_device *p; + + if (sd_device_get_parent(d, &p) < 0) + continue; + + /* If the parent shares the same subsystem as the + * device we are looking at then it is a connector, + * which is what we are interested in. */ + if (sd_device_get_subsystem(p, &subsys) < 0 || !streq(subsys, "drm")) + continue; + + if (sd_device_get_sysname(d, &nn) < 0) + continue; + + /* Ignore internal displays: the type is encoded in the sysfs name, as the second dash + * separated item (the first is the card name, the last the connector number). We implement a + * deny list of external displays here, rather than an allow list of internal ones, to ensure + * we don't block suspends too eagerly. */ + dash = strchr(nn, '-'); + if (!dash) + continue; + + dash++; + if (!STARTSWITH_SET(dash, + "VGA-", "DVI-I-", "DVI-D-", "DVI-A-" + "Composite-", "SVIDEO-", "Component-", + "DIN-", "DP-", "HDMI-A-", "HDMI-B-", "TV-")) + continue; + + /* Ignore ports that are not enabled */ + if (sd_device_get_sysattr_value(d, "enabled", &enabled) < 0 || !streq(enabled, "enabled")) + continue; + + /* We count any connector which is not explicitly + * "disconnected" as connected. */ + if (sd_device_get_sysattr_value(d, "status", &status) < 0 || !streq(status, "disconnected")) + n++; + } + + return n; +} + +bool manager_is_docked_or_external_displays(Manager *m) { + int n; + + /* If we are docked don't react to lid closing */ + if (manager_is_docked(m)) { + log_debug("System is docked."); + return true; + } + + /* If we have more than one display connected, + * assume that we are docked. */ + n = manager_count_external_displays(m); + if (n < 0) + log_warning_errno(n, "Display counting failed: %m"); + else if (n >= 1) { + log_debug("External (%i) displays connected.", n); + return true; + } + + return false; +} + +bool manager_is_on_external_power(void) { + int r; + + /* For now we only check for AC power, but 'external power' can apply to anything that isn't an internal + * battery */ + r = on_ac_power(); + if (r < 0) + log_warning_errno(r, "Failed to read AC power status: %m"); + + return r != 0; /* Treat failure as 'on AC' */ +} + +bool manager_all_buttons_ignored(Manager *m) { + assert(m); + + if (m->handle_power_key != HANDLE_IGNORE) + return false; + if (m->handle_power_key_long_press != HANDLE_IGNORE) + return false; + if (m->handle_suspend_key != HANDLE_IGNORE) + return false; + if (m->handle_suspend_key_long_press != HANDLE_IGNORE) + return false; + if (m->handle_hibernate_key != HANDLE_IGNORE) + return false; + if (m->handle_hibernate_key_long_press != HANDLE_IGNORE) + return false; + if (m->handle_reboot_key != HANDLE_IGNORE) + return false; + if (m->handle_reboot_key_long_press != HANDLE_IGNORE) + return false; + if (m->handle_lid_switch != HANDLE_IGNORE) + return false; + if (!IN_SET(m->handle_lid_switch_ep, _HANDLE_ACTION_INVALID, HANDLE_IGNORE)) + return false; + if (m->handle_lid_switch_docked != HANDLE_IGNORE) + return false; + + return true; +} + +int manager_read_utmp(Manager *m) { +#if ENABLE_UTMP + int r; + _unused_ _cleanup_(utxent_cleanup) bool utmpx = false; + + assert(m); + + if (utmpxname(_PATH_UTMPX) < 0) + return log_error_errno(errno, "Failed to set utmp path to " _PATH_UTMPX ": %m"); + + utmpx = utxent_start(); + + for (;;) { + _cleanup_free_ char *t = NULL; + struct utmpx *u; + const char *c; + Session *s; + + errno = 0; + u = getutxent(); + if (!u) { + if (errno == ENOENT) + log_debug_errno(errno, _PATH_UTMPX " does not exist, ignoring."); + else if (errno != 0) + log_warning_errno(errno, "Failed to read " _PATH_UTMPX ", ignoring: %m"); + return 0; + } + + if (u->ut_type != USER_PROCESS) + continue; + + if (!pid_is_valid(u->ut_pid)) + continue; + + t = strndup(u->ut_line, sizeof(u->ut_line)); + if (!t) + return log_oom(); + + c = path_startswith(t, "/dev/"); + if (c) { + r = free_and_strdup(&t, c); + if (r < 0) + return log_oom(); + } + + if (isempty(t)) + continue; + + s = hashmap_get(m->sessions_by_leader, PID_TO_PTR(u->ut_pid)); + if (!s) + continue; + + if (s->tty_validity == TTY_FROM_UTMP && !streq_ptr(s->tty, t)) { + /* This may happen on multiplexed SSH connection (i.e. 'SSH connection sharing'). In + * this case PAM and utmp sessions don't match. In such a case let's invalidate the TTY + * information and never acquire it again. */ + + s->tty = mfree(s->tty); + s->tty_validity = TTY_UTMP_INCONSISTENT; + log_debug("Session '%s' has inconsistent TTY information, dropping TTY information.", s->id); + continue; + } + + /* Never override what we figured out once */ + if (s->tty || s->tty_validity >= 0) + continue; + + s->tty = TAKE_PTR(t); + s->tty_validity = TTY_FROM_UTMP; + log_debug("Acquired TTY information '%s' from utmp for session '%s'.", s->tty, s->id); + } + +#else + return 0; +#endif +} + +#if ENABLE_UTMP +static int manager_dispatch_utmp(sd_event_source *s, const struct inotify_event *event, void *userdata) { + Manager *m = ASSERT_PTR(userdata); + + /* If there's indication the file itself might have been removed or became otherwise unavailable, then let's + * reestablish the watch on whatever there's now. */ + if ((event->mask & (IN_ATTRIB|IN_DELETE_SELF|IN_MOVE_SELF|IN_Q_OVERFLOW|IN_UNMOUNT)) != 0) + manager_connect_utmp(m); + + (void) manager_read_utmp(m); + return 0; +} +#endif + +void manager_connect_utmp(Manager *m) { +#if ENABLE_UTMP + sd_event_source *s = NULL; + int r; + + assert(m); + + /* Watch utmp for changes via inotify. We do this to deal with tools such as ssh, which will register the PAM + * session early, and acquire a TTY only much later for the connection. Thus during PAM the TTY won't be known + * yet. ssh will register itself with utmp when it finally acquired the TTY. Hence, let's make use of this, and + * watch utmp for the TTY asynchronously. We use the PAM session's leader PID as key, to find the right entry. + * + * Yes, relying on utmp is pretty ugly, but it's good enough for informational purposes, as well as idle + * detection (which, for tty sessions, relies on the TTY used) */ + + r = sd_event_add_inotify(m->event, &s, _PATH_UTMPX, IN_MODIFY|IN_MOVE_SELF|IN_DELETE_SELF|IN_ATTRIB, manager_dispatch_utmp, m); + if (r < 0) + log_full_errno(r == -ENOENT ? LOG_DEBUG: LOG_WARNING, r, "Failed to create inotify watch on " _PATH_UTMPX ", ignoring: %m"); + else { + r = sd_event_source_set_priority(s, SD_EVENT_PRIORITY_IDLE); + if (r < 0) + log_warning_errno(r, "Failed to adjust utmp event source priority, ignoring: %m"); + + (void) sd_event_source_set_description(s, "utmp"); + } + + sd_event_source_unref(m->utmp_event_source); + m->utmp_event_source = s; +#endif +} + +void manager_reconnect_utmp(Manager *m) { +#if ENABLE_UTMP + assert(m); + + if (m->utmp_event_source) + return; + + manager_connect_utmp(m); +#endif +} + +int manager_read_efi_boot_loader_entries(Manager *m) { +#if ENABLE_EFI + int r; + + assert(m); + if (m->efi_boot_loader_entries_set) + return 0; + + r = efi_loader_get_entries(&m->efi_boot_loader_entries); + if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r)) { + log_debug_errno(r, "Boot loader reported no entries."); + m->efi_boot_loader_entries_set = true; + return 0; + } + if (r < 0) + return log_error_errno(r, "Failed to determine entries reported by boot loader: %m"); + + m->efi_boot_loader_entries_set = true; + return 1; +#else + return 0; +#endif +} |