/*
* Copyright (c) 2014 Ian Sutton <ian@kremlin.cc>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <unistd.h>
#include <limits.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <time.h>
#include <string.h>
#include <glib/gprintf.h>
#include <glib-unix.h>
#include <glib/gstdio.h>
#include <polkit/polkit.h>
#include "timedated-gen.h"
#include "timedated.h"
#include "../../util.h"
GPtrArray *timedated_freeable;
Timedate1 *timedated_interf;
GMainLoop *timedated_loop;
guint bus_descriptor;
gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
const gchar *OS_LOCALTIME = "/etc/localtime"; /* current timezone file */
const gchar *OS_TIMEZONE_PATH = "/usr/share/zoneinfo"; /* path to system timezone files */
struct timezone_checksum_pair {
gchar *path;
gchar *sum;
gboolean posix;
gboolean right;
};
static struct timezone_checksum_pair tz_table[5000];
/* --- begin method/property/dbus signal code --- */
static gboolean
on_handle_set_time(Timedate1 *td1_passed_interf,
GDBusMethodInvocation *invoc,
const gchar *greet,
gpointer data) {
GVariant *params;
gint64 proposed_time, cur_time;
const gchar *bus_name;
gboolean policykit_auth;
check_auth_result is_authed;
gboolean relative; /* relative if passed time_t is meant to be added to current time */
struct timespec new_time;
params = g_dbus_method_invocation_get_parameters(invoc);
g_variant_get(params, "(xbb)", &proposed_time, &relative, &policykit_auth);
bus_name = g_dbus_method_invocation_get_sender(invoc);
is_authed = polkit_try_auth(bus_name, "org.freedesktop.timedate1.set-time", policykit_auth);
switch(is_authed) {
case AUTHORIZED_NATIVELY:
case AUTHORIZED_BY_PROMPT:
break;
case UNAUTHORIZED_NATIVELY:
case UNAUTHORIZED_FAILED_PROMPT:
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EACCES", "Insufficient permissions to set system time.");
return FALSE;
case ERROR_BADBUS:
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided bus name is invalid.");
return FALSE;
case ERROR_BADACTION:
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided action ID is invalid.");
return FALSE;
case ERROR_GENERIC:
default:
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to set system time for unknown reasons.");
return FALSE;
}
if(!proposed_time) {
timedate1_complete_set_time(td1_passed_interf, invoc);
return TRUE;
} else if(relative) {
cur_time = g_get_real_time();
if(proposed_time < 0 && cur_time + proposed_time > cur_time) {
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EINVAL", "Resultant time out of bounds.");
return FALSE;
} else if(proposed_time > 0 && cur_time + proposed_time < cur_time) {
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EINVAL", "Resultant time out of bounds.");
return FALSE;
}
new_time.tv_sec = (cur_time + proposed_time) / 1000000;
new_time.tv_nsec = CLAMP((((cur_time + proposed_time) % 1000000) * 1000), 0, 1000000000);
if(!clock_settime(CLOCK_REALTIME, &new_time)) {
timedate1_complete_set_time(td1_passed_interf, invoc);
return TRUE;
} else {
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to set system time for unknown reasons.");
return FALSE;
}
} else if(proposed_time > 0) {
new_time.tv_sec = (cur_time + proposed_time) / 1000000;
new_time.tv_nsec = CLAMP((((cur_time + proposed_time) % 1000000) * 1000), 0, 1000000000);
if(!clock_settime(CLOCK_REALTIME, &new_time)) {
timedate1_complete_set_time(td1_passed_interf, invoc);
return TRUE;
} else {
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to set system time for unknown reasons.");
return FALSE;
}
} else {
g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EINVAL", "Resultant time out of bounds.");
return FALSE;
}
}
static gboolean
on_handle_set_timezone(Timedate1 *td1_passed_interf,
GDBusMethodInvocation *invoc,
const gchar *greet,
gpointer data) {
return FALSE;
}
static gboolean
on_handle_set_local_rtc(Timedate1 *td1_passed_interf,
GDBusMethodInvocation *invoc,
const gchar *greet,
gpointer data) {
return FALSE;
}
static gboolean
on_handle_set_ntp(Timedate1 *td1_passed_interf,
GDBusMethodInvocation *invoc,
const gchar *greet,
gpointer data) {
return FALSE;
}
const gchar *
our_get_timezone() {
GStatBuf *stat_zoneinfo;
gchar *find_cmd, *readlink_path, *ret, *argvp, *hash_to_match;
gint argcp;
GError *err;
struct timezone_checksum_pair tmp;
find_cmd = (gchar *) g_malloc0(2048);
stat_zoneinfo = (GStatBuf *) g_malloc0(8192);
err = (GError *) g_malloc0(2048);
if(g_stat(OS_LOCALTIME, stat_zoneinfo)) {
g_printf("could not read from %s! please symlink or copy a timezone file from %s to %s!\n", OS_LOCALTIME, OS_TIMEZONE_PATH, OS_LOCALTIME);
ret = NULL;
} else if(g_file_test(OS_LOCALTIME, G_FILE_TEST_IS_SYMLINK)) {
readlink_path = g_file_read_link(OS_LOCALTIME, &err);
gchar *split[2] = { readlink_path, "" };
tmp = parse_timezone_path(split);
ret = tmp.path;
if(readlink_path)
g_free(readlink_path);
} else {
g_printf("%s is not a symlink! attempting to match checksums in %s...\n", OS_LOCALTIME, OS_TIMEZONE_PATH);
hash_to_match = get_file_sha256(OS_LOCALTIME);
ret = lookup_hash(hash_to_match);
if(hash_to_match)
g_free(hash_to_match);
}
return ret;
}
gboolean
our_get_local_rtc() {
gboolean ret = FALSE;
return ret;
}
gboolean
our_get_can_ntp() {
const gboolean ret = FALSE;
return ret;
}
gboolean
our_get_ntp() {
const gboolean ret = FALSE;
return ret;
}
gboolean
our_get_ntpsynchronized() {
const gboolean ret = FALSE;
return ret;
}
guint64
our_get_time_usec() {
guint64 ret = 0;
return ret;
}
guint64
our_get_rtc_time_usec() {
guint64 ret = 0;
return ret;
}
/* --- end method/property/dbus signal code, begin bus/name handlers --- */
static void timedated_on_bus_acquired(GDBusConnection *conn,
const gchar *name,
gpointer user_data) {
g_printf("got bus/name, exporting %s's interface...\n", name);
timedated_interf = timedate1_skeleton_new();
/* attach function pointers to generated struct's method handlers */
g_signal_connect(timedated_interf, "handle-set-time", G_CALLBACK(on_handle_set_time), NULL);
g_signal_connect(timedated_interf, "handle-set-timezone", G_CALLBACK(on_handle_set_timezone), NULL);
g_signal_connect(timedated_interf, "handle-set-local-rtc", G_CALLBACK(on_handle_set_local_rtc), NULL);
g_signal_connect(timedated_interf, "handle-set-ntp", G_CALLBACK(on_handle_set_ntp), NULL);
/* set our properties before export */
timedate1_set_timezone(timedated_interf, our_get_timezone());
timedate1_set_local_rtc(timedated_interf, our_get_local_rtc());
timedate1_set_can_ntp(timedated_interf, our_get_can_ntp());
timedate1_set_ntp(timedated_interf, our_get_ntp());
timedate1_set_ntpsynchronized(timedated_interf, our_get_ntpsynchronized());
timedate1_set_time_usec(timedated_interf, our_get_time_usec());
timedate1_set_rtctime_usec(timedated_interf, our_get_rtc_time_usec());
if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(timedated_interf),
conn,
"/org/freedesktop/timedate1",
NULL)) {
g_printf("failed to export %s's interface!\n", name);
timedated_mem_clean();
} else {
dbus_interface_exported = TRUE;
g_printf("exported %s's interface on the system bus...\n", name);
}
}
static void timedated_on_name_acquired(GDBusConnection *conn,
const gchar *name,
gpointer user_data) {
g_printf("success!\n");
}
static void timedated_on_name_lost(GDBusConnection *conn,
const gchar *name,
gpointer user_data) {
if(!conn) {
g_printf("failed to connect to the system bus while trying to acquire name '%s': either dbus-daemon isn't running or we don't have permission to push names and/or their interfaces to it.\n", name);
timedated_mem_clean();
}
g_print("lost name %s, exiting...\n", name);
timedated_mem_clean();
}
/* --- end bus/name handlers, begin misc unix functions --- */
/* safe call to clean and then exit
* this stops our GMainLoop safely before letting main() return */
void timedated_mem_clean() {
g_printf("exiting...\n");
if(dbus_interface_exported)
g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(timedated_interf));
if(g_main_loop_is_running(timedated_loop))
g_main_loop_quit(timedated_loop);
}
/* wrapper for glib's unix signal handling; called only once if terminating signal is raised against us */
gboolean unix_sig_terminate_handler(gpointer data) {
g_printf("caught SIGINT/HUP/TERM, exiting\n");
timedated_mem_clean();
return G_SOURCE_REMOVE;
}
void set_signal_handlers() {
/* we don't care about its descriptor, we never need to unregister these */
g_unix_signal_add(SIGINT, unix_sig_terminate_handler, NULL);
g_unix_signal_add(SIGHUP, unix_sig_terminate_handler, NULL);
g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
}
int main() {
set_signal_handlers();
if(!build_lookup_table())
return 1;
timedated_loop = g_main_loop_new(NULL, TRUE);
timedated_freeable = g_ptr_array_new();
bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
"org.freedesktop.timedate1",
G_BUS_NAME_OWNER_FLAGS_NONE,
timedated_on_bus_acquired,
timedated_on_name_acquired,
timedated_on_name_lost,
NULL,
NULL);
g_main_loop_run(timedated_loop);
/* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
g_main_loop_unref(timedated_loop);
/* guaranteed unownable */
g_bus_unown_name(bus_descriptor);
/* at this point no operations can occur with our data, it is safe to free it + its container */
g_ptr_array_free(timedated_freeable, TRUE);
return 0;
}
static struct timezone_checksum_pair parse_timezone_path(gchar **pair) {
gchar *prefix_pattern, *right_prefix_pattern, *posix_prefix_pattern, *lean_path;
GRegex *prefix, *posix, *right;
GError *err = NULL;
struct timezone_checksum_pair ret = { NULL, NULL, FALSE, FALSE };
if(!pair[0])
return ret;
prefix_pattern = (gchar *) g_malloc0(4096);
right_prefix_pattern = (gchar *) g_malloc0(4096);
posix_prefix_pattern = (gchar *) g_malloc0(4096);
g_sprintf(prefix_pattern, "%s/", OS_TIMEZONE_PATH);
g_sprintf(posix_prefix_pattern, "%s/posix/", OS_TIMEZONE_PATH);
g_sprintf(right_prefix_pattern, "%s/right/", OS_TIMEZONE_PATH);
prefix = g_regex_new(prefix_pattern, 0, 0, &err);
posix = g_regex_new(posix_prefix_pattern, 0, 0, &err);
right = g_regex_new(right_prefix_pattern, 0, 0, &err);
if(g_regex_match_full(posix, pair[0], -1, 0, G_REGEX_MATCH_NOTEMPTY, NULL, NULL)) {
ret.posix = TRUE;
lean_path = g_regex_replace_literal(posix, pair[0], -1, 0, "", G_REGEX_MATCH_NOTEMPTY, NULL);
} else if(g_regex_match_full(right, pair[0], -1, 0, G_REGEX_MATCH_NOTEMPTY, NULL, NULL)) {
ret.right = TRUE;
lean_path = g_regex_replace_literal(right, pair[0], -1, 0, "", G_REGEX_MATCH_NOTEMPTY, NULL);
} else
lean_path = g_regex_replace_literal(prefix, pair[0], -1, 0, "", G_REGEX_MATCH_NOTEMPTY, NULL);
ret.path = lean_path;
ret.sum = g_malloc0(256);
g_strlcpy(ret.sum, pair[1], 66);
g_regex_unref(prefix);
g_regex_unref(right);
g_regex_unref(posix);
return ret;
}
/* TODO need to deconstruct tz_table on exit */
static gboolean build_lookup_table() {
gchar *find_cmd, **map_pairs, *find_output, *path_buf, *sum_buf, **entry_buf;
GError *err;
gboolean ret;
gint i;
i = 0;
err = NULL;
ret = TRUE;
find_cmd = (gchar *) g_malloc0(4096);
find_output = (gchar *) g_malloc0(1000000);
g_sprintf(find_cmd, "/bin/sh -c \"find %s -type f -exec cksum -a sha256 {} \\; | sed -E 's/SHA256 \\(//g' | sed -E 's/\\) = /=/g'\"", OS_TIMEZONE_PATH);
if(!g_spawn_command_line_sync(find_cmd, &find_output, NULL, NULL, &err)) {
g_printf("error running `%s`\n", find_cmd);
ret = FALSE;
}
map_pairs = g_strsplit(find_output, "\n", INT_MAX);
while(map_pairs[i] && (entry_buf = g_strsplit(map_pairs[i], "=", INT_MAX))) {
tz_table[i] = parse_timezone_path(entry_buf);
g_strfreev(entry_buf);
i++;
}
g_free(find_output);
g_free(find_cmd);
g_free(map_pairs);
return ret;
}
static gchar *lookup_hash(gchar *hash) {
gint i = 0;
while(tz_table[i].sum)
if(!g_strcmp0(tz_table[i].sum, hash))
return tz_table[i].path;
else
i++;
return NULL;
}
