./move.sh

1 files changed, 695 insertions, 0 deletions

diff --git a/src/grp-login/logind-seat.c b/src/grp-login/logind-seat.c
new file mode 100644
index 0000000000..aec67718a1
--- /dev/null
+++ b/src/grp-login/logind-seat.c
@@ -0,0 +1,695 @@
+/***
+  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 <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <systemd/sd-messages.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "formats-util.h"
+#include "logind-acl.h"
+#include "logind-seat.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "terminal-util.h"
+#include "util.h"
+
+Seat *seat_new(Manager *m, const char *id) {
+        Seat *s;
+
+        assert(m);
+        assert(id);
+
+        s = new0(Seat, 1);
+        if (!s)
+                return NULL;
+
+        s->state_file = strappend("/run/systemd/seats/", id);
+        if (!s->state_file) {
+                free(s);
+                return NULL;
+        }
+
+        s->id = basename(s->state_file);
+        s->manager = m;
+
+        if (hashmap_put(m->seats, s->id, s) < 0) {
+                free(s->state_file);
+                free(s);
+                return NULL;
+        }
+
+        return s;
+}
+
+void seat_free(Seat *s) {
+        assert(s);
+
+        if (s->in_gc_queue)
+                LIST_REMOVE(gc_queue, s->manager->seat_gc_queue, s);
+
+        while (s->sessions)
+                session_free(s->sessions);
+
+        assert(!s->active);
+
+        while (s->devices)
+                device_free(s->devices);
+
+        hashmap_remove(s->manager->seats, s->id);
+
+        free(s->positions);
+        free(s->state_file);
+        free(s);
+}
+
+int seat_save(Seat *s) {
+        _cleanup_free_ char *temp_path = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        assert(s);
+
+        if (!s->started)
+                return 0;
+
+        r = mkdir_safe_label("/run/systemd/seats", 0755, 0, 0);
+        if (r < 0)
+                goto fail;
+
+        r = fopen_temporary(s->state_file, &f, &temp_path);
+        if (r < 0)
+                goto fail;
+
+        fchmod(fileno(f), 0644);
+
+        fprintf(f,
+                "# This is private data. Do not parse.\n"
+                "IS_SEAT0=%i\n"
+                "CAN_MULTI_SESSION=%i\n"
+                "CAN_TTY=%i\n"
+                "CAN_GRAPHICAL=%i\n",
+                seat_is_seat0(s),
+                seat_can_multi_session(s),
+                seat_can_tty(s),
+                seat_can_graphical(s));
+
+        if (s->active) {
+                assert(s->active->user);
+
+                fprintf(f,
+                        "ACTIVE=%s\n"
+                        "ACTIVE_UID="UID_FMT"\n",
+                        s->active->id,
+                        s->active->user->uid);
+        }
+
+        if (s->sessions) {
+                Session *i;
+
+                fputs("SESSIONS=", f);
+                LIST_FOREACH(sessions_by_seat, i, s->sessions) {
+                        fprintf(f,
+                                "%s%c",
+                                i->id,
+                                i->sessions_by_seat_next ? ' ' : '\n');
+                }
+
+                fputs("UIDS=", f);
+                LIST_FOREACH(sessions_by_seat, i, s->sessions)
+                        fprintf(f,
+                                UID_FMT"%c",
+                                i->user->uid,
+                                i->sessions_by_seat_next ? ' ' : '\n');
+        }
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                goto fail;
+
+        if (rename(temp_path, s->state_file) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        return 0;
+
+fail:
+        (void) unlink(s->state_file);
+
+        if (temp_path)
+                (void) unlink(temp_path);
+
+        return log_error_errno(r, "Failed to save seat data %s: %m", s->state_file);
+}
+
+int seat_load(Seat *s) {
+        assert(s);
+
+        /* There isn't actually anything to read here ... */
+
+        return 0;
+}
+
+static int vt_allocate(unsigned int vtnr) {
+        char p[sizeof("/dev/tty") + DECIMAL_STR_MAX(unsigned int)];
+        _cleanup_close_ int fd = -1;
+
+        assert(vtnr >= 1);
+
+        xsprintf(p, "/dev/tty%u", vtnr);
+        fd = open_terminal(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
+        if (fd < 0)
+                return -errno;
+
+        return 0;
+}
+
+int seat_preallocate_vts(Seat *s) {
+        int r = 0;
+        unsigned i;
+
+        assert(s);
+        assert(s->manager);
+
+        log_debug("Preallocating VTs...");
+
+        if (s->manager->n_autovts <= 0)
+                return 0;
+
+        if (!seat_has_vts(s))
+                return 0;
+
+        for (i = 1; i <= s->manager->n_autovts; i++) {
+                int q;
+
+                q = vt_allocate(i);
+                if (q < 0) {
+                        log_error_errno(q, "Failed to preallocate VT %u: %m", i);
+                        r = q;
+                }
+        }
+
+        return r;
+}
+
+int seat_apply_acls(Seat *s, Session *old_active) {
+        int r;
+
+        assert(s);
+
+        r = devnode_acl_all(s->manager->udev,
+                            s->id,
+                            false,
+                            !!old_active, old_active ? old_active->user->uid : 0,
+                            !!s->active, s->active ? s->active->user->uid : 0);
+
+        if (r < 0)
+                log_error_errno(r, "Failed to apply ACLs: %m");
+
+        return r;
+}
+
+int seat_set_active(Seat *s, Session *session) {
+        Session *old_active;
+
+        assert(s);
+        assert(!session || session->seat == s);
+
+        if (session == s->active)
+                return 0;
+
+        old_active = s->active;
+        s->active = session;
+
+        if (old_active) {
+                session_device_pause_all(old_active);
+                session_send_changed(old_active, "Active", NULL);
+        }
+
+        seat_apply_acls(s, old_active);
+
+        if (session && session->started) {
+                session_send_changed(session, "Active", NULL);
+                session_device_resume_all(session);
+        }
+
+        if (!session || session->started)
+                seat_send_changed(s, "ActiveSession", NULL);
+
+        seat_save(s);
+
+        if (session) {
+                session_save(session);
+                user_save(session->user);
+        }
+
+        if (old_active) {
+                session_save(old_active);
+                if (!session || session->user != old_active->user)
+                        user_save(old_active->user);
+        }
+
+        return 0;
+}
+
+int seat_switch_to(Seat *s, unsigned int num) {
+        /* Public session positions skip 0 (there is only F1-F12). Maybe it
+         * will get reassigned in the future, so return error for now. */
+        if (num == 0)
+                return -EINVAL;
+
+        if (num >= s->position_count || !s->positions[num]) {
+                /* allow switching to unused VTs to trigger auto-activate */
+                if (seat_has_vts(s) && num < 64)
+                        return chvt(num);
+
+                return -EINVAL;
+        }
+
+        return session_activate(s->positions[num]);
+}
+
+int seat_switch_to_next(Seat *s) {
+        unsigned int start, i;
+
+        if (s->position_count == 0)
+                return -EINVAL;
+
+        start = 1;
+        if (s->active && s->active->position > 0)
+                start = s->active->position;
+
+        for (i = start + 1; i < s->position_count; ++i)
+                if (s->positions[i])
+                        return session_activate(s->positions[i]);
+
+        for (i = 1; i < start; ++i)
+                if (s->positions[i])
+                        return session_activate(s->positions[i]);
+
+        return -EINVAL;
+}
+
+int seat_switch_to_previous(Seat *s) {
+        unsigned int start, i;
+
+        if (s->position_count == 0)
+                return -EINVAL;
+
+        start = 1;
+        if (s->active && s->active->position > 0)
+                start = s->active->position;
+
+        for (i = start - 1; i > 0; --i)
+                if (s->positions[i])
+                        return session_activate(s->positions[i]);
+
+        for (i = s->position_count - 1; i > start; --i)
+                if (s->positions[i])
+                        return session_activate(s->positions[i]);
+
+        return -EINVAL;
+}
+
+int seat_active_vt_changed(Seat *s, unsigned int vtnr) {
+        Session *i, *new_active = NULL;
+        int r;
+
+        assert(s);
+        assert(vtnr >= 1);
+
+        if (!seat_has_vts(s))
+                return -EINVAL;
+
+        log_debug("VT changed to %u", vtnr);
+
+        /* we might have earlier closing sessions on the same VT, so try to
+         * find a running one first */
+        LIST_FOREACH(sessions_by_seat, i, s->sessions)
+                if (i->vtnr == vtnr && !i->stopping) {
+                        new_active = i;
+                        break;
+                }
+
+        if (!new_active) {
+                /* no running one? then we can't decide which one is the
+                 * active one, let the first one win */
+                LIST_FOREACH(sessions_by_seat, i, s->sessions)
+                        if (i->vtnr == vtnr) {
+                                new_active = i;
+                                break;
+                        }
+        }
+
+        r = seat_set_active(s, new_active);
+        manager_spawn_autovt(s->manager, vtnr);
+
+        return r;
+}
+
+int seat_read_active_vt(Seat *s) {
+        char t[64];
+        ssize_t k;
+        unsigned int vtnr;
+        int r;
+
+        assert(s);
+
+        if (!seat_has_vts(s))
+                return 0;
+
+        lseek(s->manager->console_active_fd, SEEK_SET, 0);
+
+        k = read(s->manager->console_active_fd, t, sizeof(t)-1);
+        if (k <= 0) {
+                log_error("Failed to read current console: %s", k < 0 ? strerror(-errno) : "EOF");
+                return k < 0 ? -errno : -EIO;
+        }
+
+        t[k] = 0;
+        truncate_nl(t);
+
+        if (!startswith(t, "tty")) {
+                log_error("Hm, /sys/class/tty/tty0/active is badly formatted.");
+                return -EIO;
+        }
+
+        r = safe_atou(t+3, &vtnr);
+        if (r < 0) {
+                log_error("Failed to parse VT number %s", t+3);
+                return r;
+        }
+
+        if (!vtnr) {
+                log_error("VT number invalid: %s", t+3);
+                return -EIO;
+        }
+
+        return seat_active_vt_changed(s, vtnr);
+}
+
+int seat_start(Seat *s) {
+        assert(s);
+
+        if (s->started)
+                return 0;
+
+        log_struct(LOG_INFO,
+                   LOG_MESSAGE_ID(SD_MESSAGE_SEAT_START),
+                   "SEAT_ID=%s", s->id,
+                   LOG_MESSAGE("New seat %s.", s->id),
+                   NULL);
+
+        /* Initialize VT magic stuff */
+        seat_preallocate_vts(s);
+
+        /* Read current VT */
+        seat_read_active_vt(s);
+
+        s->started = true;
+
+        /* Save seat data */
+        seat_save(s);
+
+        seat_send_signal(s, true);
+
+        return 0;
+}
+
+int seat_stop(Seat *s, bool force) {
+        int r = 0;
+
+        assert(s);
+
+        if (s->started)
+                log_struct(LOG_INFO,
+                           LOG_MESSAGE_ID(SD_MESSAGE_SEAT_STOP),
+                           "SEAT_ID=%s", s->id,
+                           LOG_MESSAGE("Removed seat %s.", s->id),
+                           NULL);
+
+        seat_stop_sessions(s, force);
+
+        unlink(s->state_file);
+        seat_add_to_gc_queue(s);
+
+        if (s->started)
+                seat_send_signal(s, false);
+
+        s->started = false;
+
+        return r;
+}
+
+int seat_stop_sessions(Seat *s, bool force) {
+        Session *session;
+        int r = 0, k;
+
+        assert(s);
+
+        LIST_FOREACH(sessions_by_seat, session, s->sessions) {
+                k = session_stop(session, force);
+                if (k < 0)
+                        r = k;
+        }
+
+        return r;
+}
+
+void seat_evict_position(Seat *s, Session *session) {
+        Session *iter;
+        unsigned int pos = session->position;
+
+        session->position = 0;
+
+        if (pos == 0)
+                return;
+
+        if (pos < s->position_count && s->positions[pos] == session) {
+                s->positions[pos] = NULL;
+
+                /* There might be another session claiming the same
+                 * position (eg., during gdm->session transition), so let's look
+                 * for it and set it on the free slot. */
+                LIST_FOREACH(sessions_by_seat, iter, s->sessions) {
+                        if (iter->position == pos && session_get_state(iter) != SESSION_CLOSING) {
+                                s->positions[pos] = iter;
+                                break;
+                        }
+                }
+        }
+}
+
+void seat_claim_position(Seat *s, Session *session, unsigned int pos) {
+        /* with VTs, the position is always the same as the VTnr */
+        if (seat_has_vts(s))
+                pos = session->vtnr;
+
+        if (!GREEDY_REALLOC0(s->positions, s->position_count, pos + 1))
+                return;
+
+        seat_evict_position(s, session);
+
+        session->position = pos;
+        if (pos > 0)
+                s->positions[pos] = session;
+}
+
+static void seat_assign_position(Seat *s, Session *session) {
+        unsigned int pos;
+
+        if (session->position > 0)
+                return;
+
+        for (pos = 1; pos < s->position_count; ++pos)
+                if (!s->positions[pos])
+                        break;
+
+        seat_claim_position(s, session, pos);
+}
+
+int seat_attach_session(Seat *s, Session *session) {
+        assert(s);
+        assert(session);
+        assert(!session->seat);
+
+        if (!seat_has_vts(s) != !session->vtnr)
+                return -EINVAL;
+
+        session->seat = s;
+        LIST_PREPEND(sessions_by_seat, s->sessions, session);
+        seat_assign_position(s, session);
+
+        seat_send_changed(s, "Sessions", NULL);
+
+        /* On seats with VTs, the VT logic defines which session is active. On
+         * seats without VTs, we automatically activate new sessions. */
+        if (!seat_has_vts(s))
+                seat_set_active(s, session);
+
+        return 0;
+}
+
+void seat_complete_switch(Seat *s) {
+        Session *session;
+
+        assert(s);
+
+        /* if no session-switch is pending or if it got canceled, do nothing */
+        if (!s->pending_switch)
+                return;
+
+        session = s->pending_switch;
+        s->pending_switch = NULL;
+
+        seat_set_active(s, session);
+}
+
+bool seat_has_vts(Seat *s) {
+        assert(s);
+
+        return seat_is_seat0(s) && s->manager->console_active_fd >= 0;
+}
+
+bool seat_is_seat0(Seat *s) {
+        assert(s);
+
+        return s->manager->seat0 == s;
+}
+
+bool seat_can_multi_session(Seat *s) {
+        assert(s);
+
+        return seat_has_vts(s);
+}
+
+bool seat_can_tty(Seat *s) {
+        assert(s);
+
+        return seat_has_vts(s);
+}
+
+bool seat_has_master_device(Seat *s) {
+        assert(s);
+
+        /* device list is ordered by "master" flag */
+        return !!s->devices && s->devices->master;
+}
+
+bool seat_can_graphical(Seat *s) {
+        assert(s);
+
+        return seat_has_master_device(s);
+}
+
+int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
+        Session *session;
+        bool idle_hint = true;
+        dual_timestamp ts = DUAL_TIMESTAMP_NULL;
+
+        assert(s);
+
+        LIST_FOREACH(sessions_by_seat, session, s->sessions) {
+                dual_timestamp k;
+                int ih;
+
+                ih = session_get_idle_hint(session, &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 seat_check_gc(Seat *s, bool drop_not_started) {
+        assert(s);
+
+        if (drop_not_started && !s->started)
+                return false;
+
+        if (seat_is_seat0(s))
+                return true;
+
+        return seat_has_master_device(s);
+}
+
+void seat_add_to_gc_queue(Seat *s) {
+        assert(s);
+
+        if (s->in_gc_queue)
+                return;
+
+        LIST_PREPEND(gc_queue, s->manager->seat_gc_queue, s);
+        s->in_gc_queue = true;
+}
+
+static bool seat_name_valid_char(char c) {
+        return
+                (c >= 'a' && c <= 'z') ||
+                (c >= 'A' && c <= 'Z') ||
+                (c >= '0' && c <= '9') ||
+                c == '-' ||
+                c == '_';
+}
+
+bool seat_name_is_valid(const char *name) {
+        const char *p;
+
+        assert(name);
+
+        if (!startswith(name, "seat"))
+                return false;
+
+        if (!name[4])
+                return false;
+
+        for (p = name; *p; p++)
+                if (!seat_name_valid_char(*p))
+                        return false;
+
+        if (strlen(name) > 255)
+                return false;
+
+        return true;
+}