src/interfaces/timedated/timedated.c

   1 /*
   2  * Copyright (c) 2014 Ian Sutton <ian@kremlin.cc>
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <unistd.h>
  18 #include <limits.h>
  19 #include <signal.h>
  20
  21 #include <sys/types.h>
  22 #include <time.h>
  23 #include <string.h>
  24
  25 #include <glib/gprintf.h>
  26 #include <glib-unix.h>
  27 #include <glib/gstdio.h>
  28 #include <polkit/polkit.h>
  29
  30 #include "timedated-gen.h"
  31 #include "timedated.h"
  32
  33 #include "../../util.h"
  34
  35 GPtrArray *timedated_freeable;
  36 Timedate1 *timedated_interf;
  37
  38 GMainLoop *timedated_loop;
  39
  40 guint bus_descriptor;
  41 gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
  42
  43 const gchar *OS_LOCALTIME     = "/etc/localtime";      /* current timezone file */
  44 const gchar *OS_TIMEZONE_PATH = "/usr/share/zoneinfo"; /* path to system timezone files */
  45
  46 /* --- begin method/property/dbus signal code --- */
  47
  48 static gboolean
  49 on_handle_set_time(Timedate1 *hn1_passed_interf,
  50                    GDBusMethodInvocation *invoc,
  51                    const gchar *greet,
  52                    gpointer data) {
  53     return FALSE;
  54 }
  55
  56 static gboolean
  57 on_handle_set_timezone(Timedate1 *hn1_passed_interf,
  58                    GDBusMethodInvocation *invoc,
  59                    const gchar *greet,
  60                    gpointer data) {
  61     return FALSE;
  62 }
  63
  64 static gboolean
  65 on_handle_set_local_rtc(Timedate1 *hn1_passed_interf,
  66                         GDBusMethodInvocation *invoc,
  67                         const gchar *greet,
  68                         gpointer data) {
  69     return FALSE;
  70 }
  71
  72 static gboolean
  73 on_handle_set_ntp(Timedate1 *hn1_passed_interf,
  74                   GDBusMethodInvocation *invoc,
  75                   const gchar *greet,
  76                   gpointer data) {
  77     return FALSE;
  78 }
  79
  80 const gchar *
  81 our_get_timezone() {
  82
  83     GStatBuf *stat_zoneinfo;
  84     gchar *find_cmd, *readlink_path, *ret;
  85     GError *err = NULL;
  86
  87     find_cmd      = (gchar *)   g_malloc0(2048);
  88     stat_zoneinfo = (GStatBuf*) g_malloc0(8192);
  89
  90     if(g_stat(OS_LOCALTIME, stat_zoneinfo)) {
  91
  92         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);
  93         ret = NULL;
  94
  95     } else if(g_file_test(OS_LOCALTIME, G_FILE_TEST_IS_SYMLINK)) {
  96
  97         readlink_path = g_file_read_link(OS_LOCALTIME, &err);
  98         ret = parse_timezone_path(readlink_path);
  99
 100         if(readlink_path)
 101             g_free(readlink_path);
 102
 103     } else {
 104
 105         g_printf("%s is not a symlink! attempting to match checksums in %s...\n", OS_LOCALTIME, OS_TIMEZONE_PATH);
 106         g_sprintf(find_cmd, "find %s -type f", OS_TIMEZONE_PATH);
 107         ret = NULL;
 108     }
 109
 110     return ret;
 111 }
 112
 113 gboolean
 114 our_get_local_rtc() {
 115
 116     gboolean ret = FALSE;
 117
 118     return ret;
 119 }
 120
 121 gboolean
 122 our_get_can_ntp() {
 123
 124     const gboolean ret = FALSE;
 125
 126     return ret;
 127 }
 128
 129 gboolean
 130 our_get_ntp() {
 131
 132     const gboolean ret = FALSE;
 133
 134     return ret;
 135 }
 136
 137 gboolean
 138 our_get_ntpsynchronized() {
 139
 140     const gboolean ret = FALSE;
 141
 142     return ret;
 143 }
 144
 145 guint64
 146 our_get_time_usec() {
 147
 148     guint64 ret = 0;
 149
 150     return ret;
 151 }
 152
 153 guint64
 154 our_get_rtc_time_usec() {
 155
 156     guint64 ret = 0;
 157
 158     return ret;
 159 }
 160
 161 /* --- end method/property/dbus signal code, begin bus/name handlers --- */
 162
 163 static void timedated_on_bus_acquired(GDBusConnection *conn,
 164                                       const gchar *name,
 165                                       gpointer user_data) {
 166
 167     g_printf("got bus/name, exporting %s's interface...\n", name);
 168
 169     timedated_interf = timedate1_skeleton_new();
 170
 171     /* attach function pointers to generated struct's method handlers */
 172     g_signal_connect(timedated_interf, "handle-set-time",     G_CALLBACK(on_handle_set_time),     NULL);
 173     g_signal_connect(timedated_interf, "handle-set-timezone", G_CALLBACK(on_handle_set_timezone), NULL);
 174     g_signal_connect(timedated_interf, "handle-set-local-rtc", G_CALLBACK(on_handle_set_local_rtc), NULL);
 175     g_signal_connect(timedated_interf, "handle-set-ntp",      G_CALLBACK(on_handle_set_ntp),      NULL);
 176     /* set our properties before export */
 177     timedate1_set_timezone(timedated_interf, our_get_timezone());
 178     timedate1_set_local_rtc(timedated_interf, our_get_local_rtc());
 179     timedate1_set_can_ntp(timedated_interf, our_get_can_ntp());
 180     timedate1_set_ntp(timedated_interf, our_get_ntp());
 181     timedate1_set_ntpsynchronized(timedated_interf, our_get_ntpsynchronized());
 182     timedate1_set_time_usec(timedated_interf, our_get_time_usec());
 183     timedate1_set_rtctime_usec(timedated_interf, our_get_rtc_time_usec());
 184
 185     if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(timedated_interf),
 186                                          conn,
 187                                          "/org/freedesktop/timedate1",
 188                                          NULL)) {
 189
 190         g_printf("failed to export %s's interface!\n", name);
 191         timedated_mem_clean();
 192
 193     } else {
 194
 195         dbus_interface_exported = TRUE;
 196         g_printf("exported %s's interface on the system bus...\n", name);
 197     }
 198 }
 199
 200 static void timedated_on_name_acquired(GDBusConnection *conn,
 201                                        const gchar *name,
 202                                        gpointer user_data) {
 203
 204    g_printf("success!\n");
 205 }
 206
 207 static void timedated_on_name_lost(GDBusConnection *conn,
 208                                    const gchar *name,
 209                                    gpointer user_data) {
 210
 211     if(!conn) {
 212
 213         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);
 214         timedated_mem_clean();
 215     }
 216
 217     g_print("lost name %s, exiting...\n", name);
 218
 219     timedated_mem_clean();
 220 }
 221
 222 /* --- end bus/name handlers, begin misc unix functions --- */
 223
 224 /* safe call to clean and then exit
 225  * this stops our GMainLoop safely before letting main() return */
 226 void timedated_mem_clean() {
 227
 228     g_printf("exiting...\n");
 229
 230     if(dbus_interface_exported)
 231         g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(timedated_interf));
 232
 233      if(g_main_loop_is_running(timedated_loop))
 234         g_main_loop_quit(timedated_loop);
 235
 236 }
 237
 238 /* wrapper for glib's unix signal handling; called only once if terminating signal is raised against us */
 239 gboolean unix_sig_terminate_handler(gpointer data) {
 240
 241     g_printf("caught SIGINT/HUP/TERM, exiting\n");
 242
 243     timedated_mem_clean();
 244     return G_SOURCE_REMOVE;
 245 }
 246
 247 void set_signal_handlers() {
 248
 249     /* we don't care about its descriptor, we never need to unregister these */
 250     g_unix_signal_add(SIGINT,  unix_sig_terminate_handler, NULL);
 251     g_unix_signal_add(SIGHUP,  unix_sig_terminate_handler, NULL);
 252     g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
 253 }
 254
 255 int main() {
 256
 257     set_signal_handlers();
 258
 259     timedated_loop = g_main_loop_new(NULL, TRUE);
 260     timedated_freeable = g_ptr_array_new();
 261
 262      bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
 263                                     "org.freedesktop.timedate1",
 264                                     G_BUS_NAME_OWNER_FLAGS_NONE,
 265                                     timedated_on_bus_acquired,
 266                                     timedated_on_name_acquired,
 267                                     timedated_on_name_lost,
 268                                     NULL,
 269                                     NULL);
 270
 271     g_main_loop_run(timedated_loop);
 272     /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
 273     g_main_loop_unref(timedated_loop);
 274
 275     /* guaranteed unownable */
 276     g_bus_unown_name(bus_descriptor);
 277
 278     /* at this point no operations can occur with our data, it is safe to free it + its container */
 279     g_ptr_array_free(timedated_freeable, TRUE);
 280
 281     return 0;
 282 }
 283
 284 static gchar *parse_timezone_path(gchar *full_path) {
 285
 286     gchar *prefix_pattern;
 287     GRegex *prefix, *posix, *right;
 288     GError *err = NULL;
 289
 290     if(!full_path)
 291         return NULL;
 292
 293     prefix_pattern = (gchar *) g_malloc0(4096);
 294     g_sprintf(prefix_pattern, "^%s/$", OS_TIMEZONE_PATH);
 295
 296     prefix = g_regex_new(prefix_pattern, 0, 0, &err);
 297     posix  = g_regex_new("^posix/$",     0, 0, &err);
 298     right  = g_regex_new("^right/$",     0, 0, &err);
 299
 300     g_regex_unref(prefix);
 301     g_regex_unref(right);
 302     g_regex_unref(posix);
 303
 304     return NULL; /* TODO temp */
 305 }