diff options
Diffstat (limited to 'src/systemd-update-utmp')
| -rw-r--r-- | src/systemd-update-utmp/Makefile | 33 | ||||
| -rw-r--r-- | src/systemd-update-utmp/update-utmp.c | 283 |
2 files changed, 316 insertions, 0 deletions
diff --git a/src/systemd-update-utmp/Makefile b/src/systemd-update-utmp/Makefile new file mode 100644 index 0000000000..5f96d09c9c --- /dev/null +++ b/src/systemd-update-utmp/Makefile @@ -0,0 +1,33 @@ +# -*- Mode: makefile; indent-tabs-mode: t -*- +# +# This file is part of systemd. +# +# Copyright 2010-2012 Lennart Poettering +# Copyright 2010-2012 Kay Sievers +# Copyright 2013 Zbigniew Jędrzejewski-Szmek +# Copyright 2013 David Strauss +# Copyright 2016 Luke Shumaker +# +# 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/>. +systemd_update_utmp_SOURCES = \ + src/update-utmp/update-utmp.c + +systemd_update_utmp_CFLAGS = \ + $(AM_CFLAGS) \ + $(AUDIT_CFLAGS) + +systemd_update_utmp_LDADD = \ + libshared.la \ + $(AUDIT_LIBS) + diff --git a/src/systemd-update-utmp/update-utmp.c b/src/systemd-update-utmp/update-utmp.c new file mode 100644 index 0000000000..8ae4a8a833 --- /dev/null +++ b/src/systemd-update-utmp/update-utmp.c @@ -0,0 +1,283 @@ +/*** + This file is part of systemd. + + Copyright 2010 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 <string.h> +#include <unistd.h> + +#ifdef HAVE_AUDIT +#include <libaudit.h> +#endif + +#include "sd-bus.h" + +#include "alloc-util.h" +#include "bus-error.h" +#include "bus-util.h" +#include "formats-util.h" +#include "log.h" +#include "macro.h" +#include "special.h" +#include "unit-name.h" +#include "util.h" +#include "utmp-wtmp.h" + +typedef struct Context { + sd_bus *bus; +#ifdef HAVE_AUDIT + int audit_fd; +#endif +} Context; + +static usec_t get_startup_time(Context *c) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + usec_t t = 0; + int r; + + assert(c); + + r = sd_bus_get_property_trivial( + c->bus, + "org.freedesktop.systemd1", + "/org/freedesktop/systemd1", + "org.freedesktop.systemd1.Manager", + "UserspaceTimestamp", + &error, + 't', &t); + if (r < 0) { + log_error_errno(r, "Failed to get timestamp: %s", bus_error_message(&error, r)); + return 0; + } + + return t; +} + +static int get_current_runlevel(Context *c) { + static const struct { + const int runlevel; + const char *special; + } table[] = { + /* The first target of this list that is active or has + * a job scheduled wins. We prefer runlevels 5 and 3 + * here over the others, since these are the main + * runlevels used on Fedora. It might make sense to + * change the order on some distributions. */ + { '5', SPECIAL_GRAPHICAL_TARGET }, + { '3', SPECIAL_MULTI_USER_TARGET }, + { '1', SPECIAL_RESCUE_TARGET }, + }; + + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + int r; + unsigned i; + + assert(c); + + for (i = 0; i < ELEMENTSOF(table); i++) { + _cleanup_free_ char *state = NULL, *path = NULL; + + path = unit_dbus_path_from_name(table[i].special); + if (!path) + return log_oom(); + + r = sd_bus_get_property_string( + c->bus, + "org.freedesktop.systemd1", + path, + "org.freedesktop.systemd1.Unit", + "ActiveState", + &error, + &state); + if (r < 0) + return log_warning_errno(r, "Failed to get state: %s", bus_error_message(&error, r)); + + if (streq(state, "active") || streq(state, "reloading")) + return table[i].runlevel; + } + + return 0; +} + +static int on_reboot(Context *c) { + int r = 0, q; + usec_t t; + + assert(c); + + /* We finished start-up, so let's write the utmp + * record and send the audit msg */ + +#ifdef HAVE_AUDIT + if (c->audit_fd >= 0) + if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && + errno != EPERM) { + r = log_error_errno(errno, "Failed to send audit message: %m"); + } +#endif + + /* If this call fails it will return 0, which + * utmp_put_reboot() will then fix to the current time */ + t = get_startup_time(c); + + q = utmp_put_reboot(t); + if (q < 0) { + log_error_errno(q, "Failed to write utmp record: %m"); + r = q; + } + + return r; +} + +static int on_shutdown(Context *c) { + int r = 0, q; + + assert(c); + + /* We started shut-down, so let's write the utmp + * record and send the audit msg */ + +#ifdef HAVE_AUDIT + if (c->audit_fd >= 0) + if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && + errno != EPERM) { + r = log_error_errno(errno, "Failed to send audit message: %m"); + } +#endif + + q = utmp_put_shutdown(); + if (q < 0) { + log_error_errno(q, "Failed to write utmp record: %m"); + r = q; + } + + return r; +} + +static int on_runlevel(Context *c) { + int r = 0, q, previous, runlevel; + + assert(c); + + /* We finished changing runlevel, so let's write the + * utmp record and send the audit msg */ + + /* First, get last runlevel */ + q = utmp_get_runlevel(&previous, NULL); + + if (q < 0) { + if (q != -ESRCH && q != -ENOENT) + return log_error_errno(q, "Failed to get current runlevel: %m"); + + previous = 0; + } + + /* Secondly, get new runlevel */ + runlevel = get_current_runlevel(c); + + if (runlevel < 0) + return runlevel; + + if (previous == runlevel) + return 0; + +#ifdef HAVE_AUDIT + if (c->audit_fd >= 0) { + _cleanup_free_ char *s = NULL; + + if (asprintf(&s, "old-level=%c new-level=%c", + previous > 0 ? previous : 'N', + runlevel > 0 ? runlevel : 'N') < 0) + return log_oom(); + + if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && errno != EPERM) + r = log_error_errno(errno, "Failed to send audit message: %m"); + } +#endif + + q = utmp_put_runlevel(runlevel, previous); + if (q < 0 && q != -ESRCH && q != -ENOENT) { + log_error_errno(q, "Failed to write utmp record: %m"); + r = q; + } + + return r; +} + +int main(int argc, char *argv[]) { + Context c = { +#ifdef HAVE_AUDIT + .audit_fd = -1 +#endif + }; + int r; + + if (getppid() != 1) { + log_error("This program should be invoked by init only."); + return EXIT_FAILURE; + } + + if (argc != 2) { + log_error("This program requires one argument."); + return EXIT_FAILURE; + } + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + umask(0022); + +#ifdef HAVE_AUDIT + /* If the kernel lacks netlink or audit support, + * don't worry about it. */ + c.audit_fd = audit_open(); + if (c.audit_fd < 0 && errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) + log_error_errno(errno, "Failed to connect to audit log: %m"); +#endif + r = bus_connect_system_systemd(&c.bus); + if (r < 0) { + log_error_errno(r, "Failed to get D-Bus connection: %m"); + r = -EIO; + goto finish; + } + + log_debug("systemd-update-utmp running as pid "PID_FMT, getpid()); + + if (streq(argv[1], "reboot")) + r = on_reboot(&c); + else if (streq(argv[1], "shutdown")) + r = on_shutdown(&c); + else if (streq(argv[1], "runlevel")) + r = on_runlevel(&c); + else { + log_error("Unknown command %s", argv[1]); + r = -EINVAL; + } + + log_debug("systemd-update-utmp stopped as pid "PID_FMT, getpid()); + +finish: +#ifdef HAVE_AUDIT + if (c.audit_fd >= 0) + audit_close(c.audit_fd); +#endif + + sd_bus_flush_close_unref(c.bus); + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |