mirror of
https://github.com/systemd/systemd-stable.git
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loginctl: add basic implementation of loginctl for introspecting controlling sessions/users/seats
This commit is contained in:
Lennart Poettering
parent
1968a36040
commit
abca482291
1
.gitignore
vendored
1
.gitignore
vendored
@ -1,3 +1,4 @@
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systemd-loginctl
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systemd-localed
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systemd-timedated
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systemd-uaccess
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16
Makefile.am
16
Makefile.am
@ -116,6 +116,7 @@ endif
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rootbin_PROGRAMS = \
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systemd \
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systemctl \
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systemd-loginctl \
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systemd-notify \
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systemd-ask-password \
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systemd-tty-ask-password-agent \
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@ -1130,6 +1131,21 @@ systemctl_LDADD = \
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libsystemd-daemon.la \
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$(DBUS_LIBS)
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systemd_loginctl_SOURCES = \
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src/loginctl.c \
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src/dbus-common.c \
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src/cgroup-show.c \
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src/cgroup-util.c \
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src/pager.c
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systemd_loginctl_CFLAGS = \
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$(AM_CFLAGS) \
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$(DBUS_CFLAGS)
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systemd_loginctl_LDADD = \
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libsystemd-basic.la \
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$(DBUS_LIBS)
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systemd_notify_SOURCES = \
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src/notify.c \
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src/sd-readahead.c
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@ -821,3 +821,19 @@ int bus_append_strv_iter(DBusMessageIter *iter, char **l) {
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return 0;
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}
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int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next) {
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assert(iter);
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assert(data);
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if (dbus_message_iter_get_arg_type(iter) != type)
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return -EIO;
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dbus_message_iter_get_basic(iter, data);
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if (!dbus_message_iter_next(iter) != !next)
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return -EIO;
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return 0;
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}
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@ -163,4 +163,6 @@ int bus_parse_strv_iter(DBusMessageIter *iter, char ***_l);
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int bus_append_strv_iter(DBusMessageIter *iter, char **l);
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int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next);
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#endif
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531
src/loginctl.c
Normal file
531
src/loginctl.c
Normal file
@ -0,0 +1,531 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <dbus/dbus.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <getopt.h>
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#include "log.h"
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#include "util.h"
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#include "macro.h"
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#include "pager.h"
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#include "dbus-common.h"
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#include "build.h"
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static bool arg_no_pager = false;
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static enum transport {
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TRANSPORT_NORMAL,
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TRANSPORT_SSH,
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TRANSPORT_POLKIT
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} arg_transport = TRANSPORT_NORMAL;
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static const char *arg_host = NULL;
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static bool on_tty(void) {
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static int t = -1;
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/* Note that this is invoked relatively early, before we start
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* the pager. That means the value we return reflects whether
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* we originally were started on a tty, not if we currently
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* are. But this is intended, since we want colour and so on
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* when run in our own pager. */
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if (_unlikely_(t < 0))
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t = isatty(STDOUT_FILENO) > 0;
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return t;
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}
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static void pager_open_if_enabled(void) {
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on_tty();
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if (!arg_no_pager)
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pager_open();
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}
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static int list_sessions(DBusConnection *bus, char **args, unsigned n) {
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DBusMessage *m = NULL, *reply = NULL;
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DBusError error;
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int r;
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DBusMessageIter iter, sub, sub2;
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unsigned k = 0;
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dbus_error_init(&error);
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assert(bus);
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pager_open_if_enabled();
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m = dbus_message_new_method_call(
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"org.freedesktop.login1",
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"/org/freedesktop/login1",
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"org.freedesktop.login1.Manager",
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"ListSessions");
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if (!m) {
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log_error("Could not allocate message.");
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return -ENOMEM;
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}
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
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if (!reply) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_iter_init(reply, &iter) ||
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dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
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dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&iter, &sub);
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if (on_tty())
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printf("%10s %10s %-16s %-16s\n", "SESSION", "UID", "USER", "SEAT");
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while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
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const char *id, *user, *seat, *object;
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uint32_t uid;
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if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&sub, &sub2);
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if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &id, true) < 0 ||
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bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &uid, true) < 0 ||
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bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &user, true) < 0 ||
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bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &seat, true) < 0 ||
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bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &object, false) < 0) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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printf("%10s %10u %-16s %-16s\n", id, (unsigned) uid, user, seat);
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k++;
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dbus_message_iter_next(&sub);
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}
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if (on_tty())
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printf("\n%u sessions listed.\n", k);
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r = 0;
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static int list_users(DBusConnection *bus, char **args, unsigned n) {
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DBusMessage *m = NULL, *reply = NULL;
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DBusError error;
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int r;
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DBusMessageIter iter, sub, sub2;
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unsigned k = 0;
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dbus_error_init(&error);
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assert(bus);
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pager_open_if_enabled();
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m = dbus_message_new_method_call(
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"org.freedesktop.login1",
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"/org/freedesktop/login1",
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"org.freedesktop.login1.Manager",
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"ListUsers");
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if (!m) {
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log_error("Could not allocate message.");
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return -ENOMEM;
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}
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
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if (!reply) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_iter_init(reply, &iter) ||
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dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
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dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&iter, &sub);
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if (on_tty())
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printf("%10s %-16s\n", "UID", "USER");
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while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
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const char *user, *object;
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uint32_t uid;
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if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&sub, &sub2);
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if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &uid, true) < 0 ||
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bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &user, true) < 0 ||
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bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &object, false) < 0) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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printf("%10u %-16s\n", (unsigned) uid, user);
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k++;
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dbus_message_iter_next(&sub);
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}
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if (on_tty())
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printf("\n%u users listed.\n", k);
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r = 0;
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static int list_seats(DBusConnection *bus, char **args, unsigned n) {
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DBusMessage *m = NULL, *reply = NULL;
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DBusError error;
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int r;
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DBusMessageIter iter, sub, sub2;
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unsigned k = 0;
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dbus_error_init(&error);
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assert(bus);
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pager_open_if_enabled();
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m = dbus_message_new_method_call(
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"org.freedesktop.login1",
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"/org/freedesktop/login1",
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"org.freedesktop.login1.Manager",
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"ListSeats");
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if (!m) {
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log_error("Could not allocate message.");
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return -ENOMEM;
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}
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
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if (!reply) {
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_iter_init(reply, &iter) ||
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dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
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dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&iter, &sub);
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if (on_tty())
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printf("%-16s\n", "SEAT");
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while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
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const char *seat, *object;
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|
||||
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
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log_error("Failed to parse reply.");
|
||||
r = -EIO;
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goto finish;
|
||||
}
|
||||
|
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dbus_message_iter_recurse(&sub, &sub2);
|
||||
|
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if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &seat, true) < 0 ||
|
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bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &object, false) < 0) {
|
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log_error("Failed to parse reply.");
|
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r = -EIO;
|
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goto finish;
|
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}
|
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printf("%-16s\n", seat);
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k++;
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dbus_message_iter_next(&sub);
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}
|
||||
|
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if (on_tty())
|
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printf("\n%u seats listed.\n", k);
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r = 0;
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|
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finish:
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if (m)
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dbus_message_unref(m);
|
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|
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if (reply)
|
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dbus_message_unref(reply);
|
||||
|
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dbus_error_free(&error);
|
||||
|
||||
return r;
|
||||
}
|
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|
||||
static int help(void) {
|
||||
|
||||
printf("%s [OPTIONS...] {COMMAND} ...\n\n"
|
||||
"Send control commands to or query the login manager.\n\n"
|
||||
" -h --help Show this help\n"
|
||||
" --version Show package version\n"
|
||||
" -H --host=[user@]host\n"
|
||||
" Show information for remote host\n"
|
||||
" -P --privileged Acquire privileges before execution\n"
|
||||
" --no-pager Do not pipe output into a pager.\n"
|
||||
"Commands:\n"
|
||||
" list-sessions List sessions\n"
|
||||
" list-users List users\n"
|
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" list-seats List seats\n",
|
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program_invocation_short_name);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int parse_argv(int argc, char *argv[]) {
|
||||
|
||||
enum {
|
||||
ARG_VERSION = 0x100,
|
||||
ARG_NO_PAGER
|
||||
};
|
||||
|
||||
static const struct option options[] = {
|
||||
{ "help", no_argument, NULL, 'h' },
|
||||
{ "version", no_argument, NULL, ARG_VERSION },
|
||||
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
|
||||
{ "host", required_argument, NULL, 'H' },
|
||||
{ "privileged",no_argument, NULL, 'P' },
|
||||
{ NULL, 0, NULL, 0 }
|
||||
};
|
||||
|
||||
int c;
|
||||
|
||||
assert(argc >= 0);
|
||||
assert(argv);
|
||||
|
||||
while ((c = getopt_long(argc, argv, "hH:P", options, NULL)) >= 0) {
|
||||
|
||||
switch (c) {
|
||||
|
||||
case 'h':
|
||||
help();
|
||||
return 0;
|
||||
|
||||
case ARG_VERSION:
|
||||
puts(PACKAGE_STRING);
|
||||
puts(DISTRIBUTION);
|
||||
puts(SYSTEMD_FEATURES);
|
||||
return 0;
|
||||
|
||||
case ARG_NO_PAGER:
|
||||
arg_no_pager = true;
|
||||
break;
|
||||
|
||||
case 'P':
|
||||
arg_transport = TRANSPORT_POLKIT;
|
||||
break;
|
||||
|
||||
case 'H':
|
||||
arg_transport = TRANSPORT_SSH;
|
||||
arg_host = optarg;
|
||||
break;
|
||||
|
||||
case '?':
|
||||
return -EINVAL;
|
||||
|
||||
default:
|
||||
log_error("Unknown option code %c", c);
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int loginctl_main(DBusConnection *bus, int argc, char *argv[], DBusError *error) {
|
||||
|
||||
static const struct {
|
||||
const char* verb;
|
||||
const enum {
|
||||
MORE,
|
||||
LESS,
|
||||
EQUAL
|
||||
} argc_cmp;
|
||||
const int argc;
|
||||
int (* const dispatch)(DBusConnection *bus, char **args, unsigned n);
|
||||
} verbs[] = {
|
||||
{ "list-sessions", LESS, 1, list_sessions },
|
||||
{ "list-users", EQUAL, 1, list_users },
|
||||
{ "list-seats", EQUAL, 1, list_seats },
|
||||
};
|
||||
|
||||
int left;
|
||||
unsigned i;
|
||||
|
||||
assert(argc >= 0);
|
||||
assert(argv);
|
||||
assert(error);
|
||||
|
||||
left = argc - optind;
|
||||
|
||||
if (left <= 0)
|
||||
/* Special rule: no arguments means "list-sessions" */
|
||||
i = 0;
|
||||
else {
|
||||
if (streq(argv[optind], "help")) {
|
||||
help();
|
||||
return 0;
|
||||
}
|
||||
|
||||
for (i = 0; i < ELEMENTSOF(verbs); i++)
|
||||
if (streq(argv[optind], verbs[i].verb))
|
||||
break;
|
||||
|
||||
if (i >= ELEMENTSOF(verbs)) {
|
||||
log_error("Unknown operation %s", argv[optind]);
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
switch (verbs[i].argc_cmp) {
|
||||
|
||||
case EQUAL:
|
||||
if (left != verbs[i].argc) {
|
||||
log_error("Invalid number of arguments.");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case MORE:
|
||||
if (left < verbs[i].argc) {
|
||||
log_error("Too few arguments.");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case LESS:
|
||||
if (left > verbs[i].argc) {
|
||||
log_error("Too many arguments.");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
default:
|
||||
assert_not_reached("Unknown comparison operator.");
|
||||
}
|
||||
|
||||
if (!bus) {
|
||||
log_error("Failed to get D-Bus connection: %s", error->message);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
return verbs[i].dispatch(bus, argv + optind, left);
|
||||
}
|
||||
|
||||
int main(int argc, char*argv[]) {
|
||||
int r, retval = EXIT_FAILURE;
|
||||
DBusConnection *bus = NULL;
|
||||
DBusError error;
|
||||
|
||||
dbus_error_init(&error);
|
||||
|
||||
log_parse_environment();
|
||||
log_open();
|
||||
|
||||
r = parse_argv(argc, argv);
|
||||
if (r < 0)
|
||||
goto finish;
|
||||
else if (r == 0) {
|
||||
retval = EXIT_SUCCESS;
|
||||
goto finish;
|
||||
}
|
||||
|
||||
if (arg_transport == TRANSPORT_NORMAL)
|
||||
bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
|
||||
else if (arg_transport == TRANSPORT_POLKIT)
|
||||
bus_connect_system_polkit(&bus, &error);
|
||||
else if (arg_transport == TRANSPORT_SSH)
|
||||
bus_connect_system_ssh(NULL, arg_host, &bus, &error);
|
||||
else
|
||||
assert_not_reached("Uh, invalid transport...");
|
||||
|
||||
r = loginctl_main(bus, argc, argv, &error);
|
||||
retval = r < 0 ? EXIT_FAILURE : r;
|
||||
|
||||
finish:
|
||||
if (bus) {
|
||||
dbus_connection_flush(bus);
|
||||
dbus_connection_close(bus);
|
||||
dbus_connection_unref(bus);
|
||||
}
|
||||
|
||||
dbus_error_free(&error);
|
||||
dbus_shutdown();
|
||||
|
||||
pager_close();
|
||||
|
||||
return retval;
|
||||
}
|
||||
@ -33,7 +33,6 @@
|
||||
#include <sys/stat.h>
|
||||
#include <stddef.h>
|
||||
#include <sys/prctl.h>
|
||||
|
||||
#include <dbus/dbus.h>
|
||||
|
||||
#include "log.h"
|
||||
@ -278,22 +277,6 @@ static int translate_bus_error_to_exit_status(int r, const DBusError *error) {
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
static int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next) {
|
||||
|
||||
assert(iter);
|
||||
assert(data);
|
||||
|
||||
if (dbus_message_iter_get_arg_type(iter) != type)
|
||||
return -EIO;
|
||||
|
||||
dbus_message_iter_get_basic(iter, data);
|
||||
|
||||
if (!dbus_message_iter_next(iter) != !next)
|
||||
return -EIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void warn_wall(enum action action) {
|
||||
static const char *table[_ACTION_MAX] = {
|
||||
[ACTION_HALT] = "The system is going down for system halt NOW!",
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user