diff options
Diffstat (limited to 'src/timedated.c')
| -rw-r--r-- | src/timedated.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/src/timedated.c b/src/timedated.c new file mode 100644 index 0000000000..4749648df9 --- /dev/null +++ b/src/timedated.c @@ -0,0 +1,544 @@ +/*-*- 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 General Public License as published by + the Free Software Foundation; either version 2 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <dbus/dbus.h> + +#include <errno.h> +#include <string.h> +#include <unistd.h> + +#include "util.h" +#include "strv.h" +#include "dbus-common.h" +#include "polkit.h" + +#define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n" +#define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n" + +#define INTROSPECTION \ + DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \ + "<node>\n" \ + " <interface name=\"org.freedesktop.timedate1\">\n" \ + " <property name=\"Timezone\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"LocalRTC\" type=\"b\" access=\"read\"/>\n" \ + " <method name=\"SetTime\">\n" \ + " <arg name=\"usec_utc\" type=\"x\" direction=\"in\"/>\n" \ + " <arg name=\"relative\" type=\"b\" direction=\"in\"/>\n" \ + " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \ + " </method>\n" \ + " <method name=\"SetTimezone\">\n" \ + " <arg name=\"timezone\" type=\"s\" direction=\"in\"/>\n" \ + " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \ + " </method>\n" \ + " <method name=\"SetLocalRTC\">\n" \ + " <arg name=\"local_rtc\" type=\"b\" direction=\"in\"/>\n" \ + " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \ + " </method>\n" \ + " </interface>\n" \ + BUS_PROPERTIES_INTERFACE \ + BUS_INTROSPECTABLE_INTERFACE \ + BUS_PEER_INTERFACE \ + "</node>\n" + +#define INTERFACES_LIST \ + BUS_GENERIC_INTERFACES_LIST \ + "org.freedesktop.locale1\0" + +static char *zone = NULL; +static bool local_rtc = false; + +static void free_data(void) { + free(zone); + zone = NULL; + + local_rtc = false; +} + +static bool valid_timezone(const char *name) { + const char *p; + char *t; + bool slash = false; + int r; + struct stat st; + + assert(name); + + if (*name == '/' || *name == 0) + return false; + + for (p = name; *p; p++) { + if (!(*p >= '0' && *p <= '9') && + !(*p >= 'a' && *p <= 'z') && + !(*p >= 'A' && *p <= 'Z') && + !(*p == '-' || *p == '_' || *p == '+' || *p == '/')) + return false; + + if (*p == '/') { + + if (slash) + return false; + + slash = true; + } else + slash = false; + } + + if (slash) + return false; + + t = strappend("/usr/share/zoneinfo/", name); + if (!t) + return false; + + r = stat(t, &st); + free(t); + + if (r < 0) + return false; + + if (!S_ISREG(st.st_mode)) + return false; + + return true; +} + +static void verify_timezone(void) { + char *p, *a = NULL, *b = NULL; + size_t l, q; + int j, k; + + if (!zone) + return; + + p = strappend("/usr/share/zoneinfo/", zone); + if (!p) { + log_error("Out of memory"); + return; + } + + j = read_full_file("/etc/localtime", &a, &l); + k = read_full_file(p, &b, &q); + + free(p); + + if (j < 0 || k < 0 || l != q || memcmp(a, b, l)) { + log_warning("/etc/localtime and /etc/timezone out of sync."); + free(zone); + zone = NULL; + } + + free(a); + free(b); +} + +static int read_data(void) { + int r; + FILE *f; + + free_data(); + + r = read_one_line_file("/etc/timezone", &zone); + if (r < 0 && r != -ENOENT) + return r; + + verify_timezone(); + + f = fopen("/etc/adjtime", "r"); + if (f) { + char line[LINE_MAX]; + bool b; + + b = fgets(line, sizeof(line), f) && + fgets(line, sizeof(line), f) && + fgets(line, sizeof(line), f); + + fclose(f); + + if (!b) + return -EIO; + + truncate_nl(line); + local_rtc = streq(line, "LOCAL"); + + } else if (errno != ENOENT) + return -errno; + + return 0; +} + +static int write_data_timezone(void) { + int r = 0; + char *p; + + if (!zone) { + if (unlink("/etc/timezone") < 0 && errno != ENOENT) + r = -errno; + + if (unlink("/etc/localtime") < 0 && errno != ENOENT) + r = -errno; + + return r; + } + + p = strappend("/usr/share/zoneinfo/", zone); + if (!p) { + log_error("Out of memory"); + return -ENOMEM; + } + + r = symlink_or_copy_atomic(p, "/etc/localtime"); + free(p); + + if (r < 0) + return r; + + r = write_one_line_file_atomic("/etc/timezone", zone); + if (r < 0) + return r; + + return 0; +} + +static int write_data_local_rtc(void) { + int r; + char *s, *w; + + r = read_full_file("/etc/adjtime", &s, NULL); + if (r < 0) { + if (r != -ENOENT) + return r; + + if (!local_rtc) + return 0; + + w = strdup(NULL_ADJTIME_LOCAL); + if (!w) + return -ENOMEM; + } else { + char *p, *e; + size_t a, b; + + p = strchr(s, '\n'); + if (!p) { + free(s); + return -EIO; + } + + p = strchr(p+1, '\n'); + if (!p) { + free(s); + return -EIO; + } + + p++; + e = strchr(p, '\n'); + if (!p) { + free(s); + return -EIO; + } + + a = p - s; + b = strlen(e); + + w = new(char, a + (local_rtc ? 5 : 3) + b + 1); + if (!w) { + free(s); + return -ENOMEM; + } + + *(char*) mempcpy(stpcpy(mempcpy(w, s, a), local_rtc ? "LOCAL" : "UTC"), e, b) = 0; + + if (streq(w, NULL_ADJTIME_UTC)) { + free(w); + + if (unlink("/etc/adjtime") < 0) { + if (errno != ENOENT) + return -errno; + } + + return 0; + } + } + + r = write_one_line_file_atomic("/etc/adjtime", w); + free(w); + + return r; +} + +static DBusHandlerResult timedate_message_handler( + DBusConnection *connection, + DBusMessage *message, + void *userdata) { + + const BusProperty properties[] = { + { "org.freedesktop.timedate1", "Timezone", bus_property_append_string, "s", zone }, + { "org.freedesktop.timedate1", "LocalRTC", bus_property_append_bool, "b", &local_rtc }, + { NULL, NULL, NULL, NULL, NULL } + }; + + DBusMessage *reply = NULL, *changed = NULL; + DBusError error; + int r; + + assert(connection); + assert(message); + + dbus_error_init(&error); + + if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTimezone")) { + const char *z; + dbus_bool_t interactive; + + if (!dbus_message_get_args( + message, + &error, + DBUS_TYPE_STRING, &z, + DBUS_TYPE_BOOLEAN, &interactive, + DBUS_TYPE_INVALID)) + return bus_send_error_reply(connection, message, &error, -EINVAL); + + if (!valid_timezone(z)) + return bus_send_error_reply(connection, message, NULL, -EINVAL); + + if (!streq_ptr(z, zone)) { + char *t; + + r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-timezone", interactive, &error); + if (r < 0) + return bus_send_error_reply(connection, message, &error, r); + + t = strdup(z); + if (!t) + goto oom; + + free(zone); + zone = t; + + r = write_data_timezone(); + if (r < 0) { + log_error("Failed to set timezone: %s", strerror(-r)); + return bus_send_error_reply(connection, message, NULL, r); + } + + log_info("Changed timezone to '%s'.", zone); + + changed = bus_properties_changed_new( + "/org/freedesktop/timedate1", + "org.freedesktop.timedate1", + "Timezone\0"); + if (!changed) + goto oom; + } + + } else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetLocalRTC")) { + dbus_bool_t lrtc; + dbus_bool_t interactive; + + if (!dbus_message_get_args( + message, + &error, + DBUS_TYPE_BOOLEAN, &lrtc, + DBUS_TYPE_BOOLEAN, &interactive, + DBUS_TYPE_INVALID)) + return bus_send_error_reply(connection, message, &error, -EINVAL); + + if (lrtc != local_rtc) { + r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-local-rtc", interactive, &error); + if (r < 0) + return bus_send_error_reply(connection, message, &error, r); + + local_rtc = lrtc; + + r = write_data_local_rtc(); + if (r < 0) { + log_error("Failed to set RTC to local/UTC: %s", strerror(-r)); + return bus_send_error_reply(connection, message, NULL, r); + } + + log_info("Changed local RTC setting to '%s'.", yes_no(local_rtc)); + + changed = bus_properties_changed_new( + "/org/freedesktop/timedate1", + "org.freedesktop.timedate1", + "LocalRTC\0"); + if (!changed) + goto oom; + } + + } else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTime")) { + int64_t utc; + dbus_bool_t relative; + dbus_bool_t interactive; + + if (!dbus_message_get_args( + message, + &error, + DBUS_TYPE_INT64, &utc, + DBUS_TYPE_BOOLEAN, &relative, + DBUS_TYPE_BOOLEAN, &interactive, + DBUS_TYPE_INVALID)) + return bus_send_error_reply(connection, message, &error, -EINVAL); + + if (!relative && utc <= 0) + return bus_send_error_reply(connection, message, NULL, -EINVAL); + + if (!relative || utc != 0) { + struct timespec ts; + + r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-time", interactive, &error); + if (r < 0) + return bus_send_error_reply(connection, message, &error, r); + + if (relative) + timespec_store(&ts, now(CLOCK_REALTIME) + utc); + else + timespec_store(&ts, utc); + + if (clock_settime(CLOCK_REALTIME, &ts) < 0) { + log_error("Failed to set local time: %m"); + return bus_send_error_reply(connection, message, NULL, -errno); + } + + log_info("Changed local time to %s", ctime(&ts.tv_sec)); + } + + } else + return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties); + + if (!(reply = dbus_message_new_method_return(message))) + goto oom; + + if (!dbus_connection_send(connection, reply, NULL)) + goto oom; + + dbus_message_unref(reply); + reply = NULL; + + if (changed) { + + if (!dbus_connection_send(connection, changed, NULL)) + goto oom; + + dbus_message_unref(changed); + } + + return DBUS_HANDLER_RESULT_HANDLED; + +oom: + if (reply) + dbus_message_unref(reply); + + if (changed) + dbus_message_unref(changed); + + dbus_error_free(&error); + + return DBUS_HANDLER_RESULT_NEED_MEMORY; +} + +static int connect_bus(DBusConnection **_bus) { + static const DBusObjectPathVTable timedate_vtable = { + .message_function = timedate_message_handler + }; + DBusError error; + DBusConnection *bus = NULL; + int r; + + assert(_bus); + + dbus_error_init(&error); + + bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error); + if (!bus) { + log_error("Failed to get system D-Bus connection: %s", error.message); + r = -ECONNREFUSED; + goto fail; + } + + if (!dbus_connection_register_object_path(bus, "/org/freedesktop/timedate1", &timedate_vtable, NULL)) { + log_error("Not enough memory"); + r = -ENOMEM; + goto fail; + } + + if (dbus_bus_request_name(bus, "org.freedesktop.timedate1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) < 0) { + log_error("Failed to register name on bus: %s", error.message); + r = -EEXIST; + goto fail; + } + + if (_bus) + *_bus = bus; + + return 0; + +fail: + dbus_connection_close(bus); + dbus_connection_unref(bus); + + dbus_error_free(&error); + + return r; +} + +int main(int argc, char *argv[]) { + int r; + DBusConnection *bus = NULL; + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + if (argc != 1) { + log_error("This program takes no arguments."); + r = -EINVAL; + goto finish; + } + + umask(0022); + + r = read_data(); + if (r < 0) { + log_error("Failed to read timezone data: %s", strerror(-r)); + goto finish; + } + + r = connect_bus(&bus); + if (r < 0) + goto finish; + + while (dbus_connection_read_write_dispatch(bus, -1)) + ; + + r = 0; + +finish: + free_data(); + + if (bus) { + dbus_connection_flush(bus); + dbus_connection_close(bus); + dbus_connection_unref(bus); + } + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |