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 <sys/time.h>
  23 #include <sys/stat.h>
  24 #include <errno.h>
  25 #include <time.h>
  26 #include <string.h>
  27 #include <tzfile.h>
  28
  29 #include <glib/gprintf.h>
  30 #include <glib-unix.h>
  31 #include <glib/gstdio.h>
  32 #include <polkit/polkit.h>
  33
  34 #include "timedated-gen.h"
  35 #include "timedated.h"
  36
  37 #include "../../util.h"
  38
  39 #define TZNAME_MAX PATH_MAX
  40
  41 GPtrArray *timedated_freeable;
  42 Timedate1 *timedated_interf;
  43
  44 GMainLoop *timedated_loop;
  45
  46 guint bus_descriptor;
  47 gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
  48
  49 const gchar *OS_LOCALTIME       = "/etc/localtime";      /* current timezone file */
  50 const gchar *OS_TIMEZONE_PATH   = "/usr/share/zoneinfo"; /* path to system timezone files */
  51
  52 struct timezone_checksum_pair {
  53
  54     gchar *path;
  55     gchar *sum;
  56     gboolean posix;
  57     gboolean right;
  58 };
  59
  60 static struct timezone_checksum_pair tz_table[5000];
  61
  62 /* --- begin method/property/dbus signal code --- */
  63
  64 static gboolean
  65 on_handle_set_time(Timedate1 *td1_passed_interf,
  66                    GDBusMethodInvocation *invoc,
  67                    const gchar *greet,
  68                    gpointer data) {
  69
  70     GVariant *params;
  71     gint64 proposed_time, cur_time;
  72     const gchar *bus_name;
  73     gboolean policykit_auth;
  74     check_auth_result is_authed;
  75     gboolean relative; /* relative if passed time_t is meant to be added to current time */
  76     struct timespec *new_time;
  77
  78     params = g_dbus_method_invocation_get_parameters(invoc);
  79     g_variant_get(params, "(xbb)", &proposed_time, &relative, &policykit_auth);
  80     bus_name = g_dbus_method_invocation_get_sender(invoc);
  81
  82     is_authed = polkit_try_auth(bus_name, "org.freedesktop.timedate1.set-time", policykit_auth);
  83
  84     switch(is_authed) {
  85
  86         case AUTHORIZED_NATIVELY:
  87         case AUTHORIZED_BY_PROMPT:
  88             break;
  89
  90         case UNAUTHORIZED_NATIVELY:
  91         case UNAUTHORIZED_FAILED_PROMPT:
  92             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EACCES", "Insufficient permissions to set system time.");
  93             return FALSE;
  94
  95         case ERROR_BADBUS:
  96             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided bus name is invalid.");
  97             return FALSE;
  98
  99         case ERROR_BADACTION:
 100             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided action ID is invalid.");
 101             return FALSE;
 102
 103         case ERROR_GENERIC:
 104         default:
 105             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to set system time for unknown reasons.");
 106             return FALSE;
 107     }
 108
 109     if(!proposed_time) {
 110
 111         timedate1_complete_set_time(td1_passed_interf, invoc);
 112         return TRUE;
 113
 114     } else if(relative) {
 115
 116         cur_time = g_get_real_time();
 117
 118         if(proposed_time < 0 && cur_time + proposed_time > cur_time) {
 119
 120             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EINVAL", "Resultant time out of bounds.");
 121             return FALSE;
 122
 123         } else if(proposed_time > 0 && cur_time + proposed_time < cur_time) {
 124
 125             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EINVAL", "Resultant time out of bounds.");
 126             return FALSE;
 127         }
 128
 129         new_time = mktimespec(proposed_time);
 130
 131         if(!clock_settime(CLOCK_REALTIME, new_time)) {
 132
 133             timedate1_complete_set_time(td1_passed_interf, invoc);
 134             return TRUE;
 135
 136         } else {
 137
 138             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to set system time for unknown reasons.");
 139             return FALSE;
 140         }
 141
 142     } else if(proposed_time > 0) {
 143
 144
 145         new_time = mktimespec(proposed_time);
 146
 147         if(!clock_settime(CLOCK_REALTIME, new_time)) {
 148
 149             timedate1_complete_set_time(td1_passed_interf, invoc);
 150             return TRUE;
 151
 152         } else {
 153
 154             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to set system time for unknown reasons.");
 155             return FALSE;
 156         }
 157
 158     } else {
 159
 160         g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EINVAL", "Resultant time out of bounds.");
 161         return FALSE;
 162     }
 163 }
 164
 165 static gboolean
 166 on_handle_set_timezone(Timedate1 *td1_passed_interf,
 167                    GDBusMethodInvocation *invoc,
 168                    const gchar *greet,
 169                    gpointer data) {
 170
 171     GVariant *params;
 172     gchar *proposed_tz;
 173     const gchar *bus_name;
 174     gboolean policykit_auth;
 175     check_auth_result is_authed;
 176
 177     gchar *tz_target_path;
 178     struct stat *statbuf;
 179     extern int errno;
 180
 181     params = g_dbus_method_invocation_get_parameters(invoc);
 182     g_variant_get(params, "(sb)", &proposed_tz, &policykit_auth);
 183     bus_name = g_dbus_method_invocation_get_sender(invoc);
 184
 185     is_authed = polkit_try_auth(bus_name, "org.freedesktop.timedate1.set-timezone", policykit_auth);
 186
 187     switch(is_authed) {
 188
 189         case AUTHORIZED_NATIVELY:
 190         case AUTHORIZED_BY_PROMPT:
 191             break;
 192
 193         case UNAUTHORIZED_NATIVELY:
 194         case UNAUTHORIZED_FAILED_PROMPT:
 195             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EACCES", "Insufficient permissions to set timezone.");
 196             return FALSE;
 197
 198         case ERROR_BADBUS:
 199             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided bus name is invalid.");
 200             return FALSE;
 201
 202         case ERROR_BADACTION:
 203             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided action ID is invalid.");
 204             return FALSE;
 205
 206         case ERROR_GENERIC:
 207         default:
 208             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to set timezone for unknown reasons.");
 209             return FALSE;
 210     }
 211
 212     statbuf        = (struct stat*) calloc(1, sizeof(struct stat));
 213     tz_target_path = (gchar *) calloc(1, TZNAME_MAX);
 214
 215     g_ptr_array_add(timedated_freeable, statbuf);
 216     g_ptr_array_add(timedated_freeable, tz_target_path);
 217
 218     strlcat(tz_target_path, TZDIR, TZNAME_MAX);
 219     strlcat(tz_target_path, "/", TZNAME_MAX);
 220     strlcat(tz_target_path, proposed_tz, TZNAME_MAX);
 221
 222     if(strstr(tz_target_path, "../")) {
 223
 224         g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EBADF", "Provided timezone is invalid.");
 225         return FALSE;
 226     }
 227
 228     if(!statbuf)
 229         return FALSE;
 230
 231     if(lstat(tz_target_path, statbuf)) {
 232
 233         switch(errno) {
 234
 235             case ENOENT:
 236                 g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ENOENT", "Specified timezone does not exist.");
 237                 break;
 238
 239             default:
 240                 g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EBADF", "Specified timezone is invalid.");
 241                 break;
 242         }
 243
 244         return FALSE;
 245     }
 246
 247     if(!S_ISREG(statbuf->st_mode)) {
 248
 249         g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EBADF", "Specified path is of an inappropriate type.");
 250         return FALSE;
 251     }
 252
 253     memset(statbuf, 0, sizeof statbuf);
 254
 255     if(!lstat(TZDEFAULT, statbuf))
 256         if(remove(TZDEFAULT))
 257             return FALSE;
 258
 259     if(symlink(tz_target_path, TZDEFAULT))
 260         return FALSE;
 261
 262
 263     timedate1_complete_set_timezone(td1_passed_interf, invoc);
 264
 265     return TRUE;
 266 }
 267
 268 static gboolean
 269 on_handle_set_local_rtc(Timedate1 *td1_passed_interf,
 270                         GDBusMethodInvocation *invoc,
 271                         const gchar *greet,
 272                         gpointer data) {
 273
 274     g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ENODEV", "Unix RTC must be in UTC.");
 275     return TRUE;
 276 }
 277
 278 static gboolean
 279 on_handle_set_ntp(Timedate1 *td1_passed_interf,
 280                   GDBusMethodInvocation *invoc,
 281                   const gchar *greet,
 282                   gpointer data) {
 283
 284     GVariant *params;
 285     const gchar *bus_name;
 286     gboolean policykit_auth;
 287     check_auth_result is_authed;
 288
 289     gint ntpd_notrunning, ntpd_notenabled; /* this logic flip is due to rcctl returning 0 on success,
 290                                              * in this case an error means ntpd is not running or not enabled */
 291     gboolean proposed_ntpstate;
 292     GError *sh_errors;
 293
 294     extern int errno;
 295
 296     params = g_dbus_method_invocation_get_parameters(invoc);
 297     g_variant_get(params, "(bb)", &proposed_ntpstate, &policykit_auth);
 298     bus_name = g_dbus_method_invocation_get_sender(invoc);
 299
 300     is_authed = polkit_try_auth(bus_name, "org.freedesktop.timedate1.set-ntp", policykit_auth);
 301
 302     switch(is_authed) {
 303
 304         case AUTHORIZED_NATIVELY:
 305         case AUTHORIZED_BY_PROMPT:
 306             break;
 307
 308         case UNAUTHORIZED_NATIVELY:
 309         case UNAUTHORIZED_FAILED_PROMPT:
 310             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EACCES", "Insufficient permissions to toggle the NTP daemon.");
 311             return FALSE;
 312
 313         case ERROR_BADBUS:
 314             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided bus name is invalid.");
 315             return FALSE;
 316
 317         case ERROR_BADACTION:
 318             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.EFAULT", "Provided action ID is invalid.");
 319             return FALSE;
 320
 321         case ERROR_GENERIC:
 322         default:
 323             g_dbus_method_invocation_return_dbus_error(invoc, "org.freedesktop.timedate1.Error.ECANCELED", "Failed to toggle the NTP daemon for unknown reasons.");
 324             return FALSE;
 325     }
 326
 327     ntpd_notrunning = 0;   /* GLib does not bother asserting the passed return value int to zero */
 328     ntpd_notenabled = 0;   /* if the program's exit status is also zero, hence this decl.        */
 329
 330     if((ntpd_notrunning = system("rcctl check ntpd > /dev/null 2>&1")) == -1)
 331         return FALSE;
 332
 333     if((ntpd_notenabled = system("rcctl status ntpd > /dev/null 2>&1")) == -1)
 334         return FALSE;
 335
 336     if(proposed_ntpstate) {
 337
 338         if(ntpd_notrunning)
 339             system("rcctl -f start ntpd > /dev/null 2>&1");
 340
 341         if(ntpd_notenabled)
 342             system("rcctl enable ntpd > /dev/null 2>&1");
 343
 344     } else {
 345
 346         if(!ntpd_notrunning)
 347             system("rcctl stop ntpd > /dev/null 2>&1");
 348
 349         if(!ntpd_notenabled)
 350             system("rcctl disable ntpd > /dev/null 2>&1");
 351     }
 352
 353     timedate1_complete_set_ntp(td1_passed_interf, invoc);
 354
 355     return TRUE;
 356 }
 357
 358 const gchar *
 359 our_get_timezone() {
 360
 361     GStatBuf *stat_zoneinfo;
 362     gchar *find_cmd, *readlink_path, *ret, *argvp, *hash_to_match;
 363     gint argcp;
 364     GError *err;
 365     struct timezone_checksum_pair tmp;
 366
 367     find_cmd      = (gchar *)    g_malloc0(2048);
 368     stat_zoneinfo = (GStatBuf *) g_malloc0(8192);
 369     err           = (GError *)   g_malloc0(2048);
 370
 371     if(g_stat(OS_LOCALTIME, stat_zoneinfo)) {
 372
 373         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);
 374         ret = NULL;
 375
 376     } else if(g_file_test(OS_LOCALTIME, G_FILE_TEST_IS_SYMLINK)) {
 377
 378         readlink_path = g_file_read_link(OS_LOCALTIME, &err);
 379
 380         gchar *split[2] = { readlink_path, "" };
 381         tmp = parse_timezone_path(split);
 382
 383         ret = tmp.path;
 384
 385         if(readlink_path)
 386             g_free(readlink_path);
 387
 388     } else {
 389
 390         g_printf("%s is not a symlink! attempting to match checksums in %s...\n", OS_LOCALTIME, OS_TIMEZONE_PATH);
 391         hash_to_match = get_file_sha256(OS_LOCALTIME);
 392
 393         /* ret = lookup_hash(hash_to_match); */
 394         return FALSE; /* TODO fix me for real */
 395
 396         if(hash_to_match)
 397             g_free(hash_to_match);
 398     }
 399
 400
 401
 402     return ret;
 403 }
 404
 405 /* Unix time must be in UTC. */
 406 gboolean
 407 our_get_local_rtc() {
 408
 409     gboolean ret = FALSE;
 410
 411     return ret;
 412 }
 413
 414 gboolean
 415 our_get_can_ntp() {
 416
 417     const gboolean ret = FALSE;
 418
 419     return ret;
 420 }
 421
 422 gboolean
 423 our_get_ntp() {
 424
 425     const gboolean ret = FALSE;
 426
 427     return ret;
 428 }
 429
 430 gboolean
 431 our_get_ntpsynchronized() {
 432
 433     const gboolean ret = FALSE;
 434
 435     return ret;
 436 }
 437
 438 guint64
 439 our_get_time_usec() {
 440
 441     guint64 ret = 0;
 442
 443     return ret;
 444 }
 445
 446 guint64
 447 our_get_rtc_time_usec() {
 448
 449     guint64 ret = 0;
 450
 451     return ret;
 452 }
 453
 454 /* --- end method/property/dbus signal code, begin bus/name handlers --- */
 455
 456 static void timedated_on_bus_acquired(GDBusConnection *conn,
 457                                       const gchar *name,
 458                                       gpointer user_data) {
 459
 460     g_printf("got bus/name, exporting %s's interface...\n", name);
 461
 462     timedated_interf = timedate1_skeleton_new();
 463
 464     /* attach function pointers to generated struct's method handlers */
 465     g_signal_connect(timedated_interf, "handle-set-time",     G_CALLBACK(on_handle_set_time),     NULL);
 466     g_signal_connect(timedated_interf, "handle-set-timezone", G_CALLBACK(on_handle_set_timezone), NULL);
 467     g_signal_connect(timedated_interf, "handle-set-local-rtc", G_CALLBACK(on_handle_set_local_rtc), NULL);
 468     g_signal_connect(timedated_interf, "handle-set-ntp",      G_CALLBACK(on_handle_set_ntp),      NULL);
 469
 470     /* set our properties before export */
 471     timedate1_set_timezone(timedated_interf, our_get_timezone());
 472     timedate1_set_local_rtc(timedated_interf, our_get_local_rtc());
 473     timedate1_set_can_ntp(timedated_interf, our_get_can_ntp());
 474     timedate1_set_ntp(timedated_interf, our_get_ntp());
 475     timedate1_set_ntpsynchronized(timedated_interf, our_get_ntpsynchronized());
 476     timedate1_set_time_usec(timedated_interf, our_get_time_usec());
 477     timedate1_set_rtctime_usec(timedated_interf, our_get_rtc_time_usec());
 478
 479     if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(timedated_interf),
 480                                          conn,
 481                                          "/org/freedesktop/timedate1",
 482                                          NULL)) {
 483
 484         g_printf("failed to export %s's interface!\n", name);
 485         timedated_mem_clean();
 486
 487     } else {
 488
 489         dbus_interface_exported = TRUE;
 490         g_printf("exported %s's interface on the system bus...\n", name);
 491     }
 492 }
 493
 494 static void timedated_on_name_acquired(GDBusConnection *conn,
 495                                        const gchar *name,
 496                                        gpointer user_data) {
 497
 498    g_printf("success!\n");
 499 }
 500
 501 static void timedated_on_name_lost(GDBusConnection *conn,
 502                                    const gchar *name,
 503                                    gpointer user_data) {
 504
 505     if(!conn) {
 506
 507         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);
 508         timedated_mem_clean();
 509     }
 510
 511     g_print("lost name %s, exiting...\n", name);
 512
 513     timedated_mem_clean();
 514 }
 515
 516 /* --- end bus/name handlers, begin misc unix functions --- */
 517
 518 /* safe call to clean and then exit
 519  * this stops our GMainLoop safely before letting main() return */
 520 void timedated_mem_clean() {
 521
 522     g_printf("exiting...\n");
 523
 524     if(dbus_interface_exported)
 525         g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(timedated_interf));
 526
 527      if(g_main_loop_is_running(timedated_loop))
 528         g_main_loop_quit(timedated_loop);
 529
 530 }
 531
 532 /* wrapper for glib's unix signal handling; called only once if terminating signal is raised against us */
 533 gboolean unix_sig_terminate_handler(gpointer data) {
 534
 535     g_printf("caught SIGINT/HUP/TERM, exiting\n");
 536
 537     timedated_mem_clean();
 538     return G_SOURCE_REMOVE;
 539 }
 540
 541 void set_signal_handlers() {
 542
 543     /* we don't care about its descriptor, we never need to unregister these */
 544     g_unix_signal_add(SIGINT,  unix_sig_terminate_handler, NULL);
 545     g_unix_signal_add(SIGHUP,  unix_sig_terminate_handler, NULL);
 546     g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
 547 }
 548
 549 int main() {
 550
 551     set_signal_handlers();
 552
 553     /*if(!build_lookup_table())
 554         return 1; */
 555
 556     timedated_loop = g_main_loop_new(NULL, TRUE);
 557     timedated_freeable = g_ptr_array_new();
 558
 559      bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
 560                                     "org.freedesktop.timedate1",
 561                                     G_BUS_NAME_OWNER_FLAGS_NONE,
 562                                     timedated_on_bus_acquired,
 563                                     timedated_on_name_acquired,
 564                                     timedated_on_name_lost,
 565                                     NULL,
 566                                     NULL);
 567
 568     g_main_loop_run(timedated_loop);
 569     /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
 570     g_main_loop_unref(timedated_loop);
 571
 572     /* guaranteed unownable */
 573     g_bus_unown_name(bus_descriptor);
 574
 575     /* at this point no operations can occur with our data, it is safe to free it + its container */
 576     g_ptr_array_free(timedated_freeable, TRUE);
 577
 578     return 0;
 579 }
 580
 581 static struct timezone_checksum_pair parse_timezone_path(gchar **pair) {
 582
 583     gchar *prefix_pattern, *right_prefix_pattern, *posix_prefix_pattern, *lean_path;
 584     GRegex *prefix, *posix, *right;
 585     GError *err = NULL;
 586     struct timezone_checksum_pair ret = { NULL, NULL, FALSE, FALSE };
 587
 588     if(!pair[0])
 589         return ret;
 590
 591     prefix_pattern = (gchar *) g_malloc0(4096);
 592     right_prefix_pattern = (gchar *) g_malloc0(4096);
 593     posix_prefix_pattern = (gchar *) g_malloc0(4096);
 594
 595     g_sprintf(prefix_pattern, "%s/", OS_TIMEZONE_PATH);
 596     g_sprintf(posix_prefix_pattern, "%s/posix/", OS_TIMEZONE_PATH);
 597     g_sprintf(right_prefix_pattern, "%s/right/", OS_TIMEZONE_PATH);
 598
 599     prefix = g_regex_new(prefix_pattern, 0, 0, &err);
 600     posix  = g_regex_new(posix_prefix_pattern, 0, 0, &err);
 601     right  = g_regex_new(right_prefix_pattern, 0, 0, &err);
 602
 603     if(g_regex_match_full(posix, pair[0], -1, 0, G_REGEX_MATCH_NOTEMPTY, NULL, NULL)) {
 604
 605         ret.posix = TRUE;
 606         lean_path = g_regex_replace_literal(posix, pair[0], -1, 0, "", G_REGEX_MATCH_NOTEMPTY, NULL);
 607
 608     } else if(g_regex_match_full(right, pair[0], -1, 0, G_REGEX_MATCH_NOTEMPTY, NULL, NULL)) {
 609
 610        ret.right = TRUE;
 611        lean_path = g_regex_replace_literal(right, pair[0], -1, 0, "", G_REGEX_MATCH_NOTEMPTY, NULL);
 612
 613     } else
 614         lean_path = g_regex_replace_literal(prefix, pair[0], -1, 0, "", G_REGEX_MATCH_NOTEMPTY, NULL);
 615
 616     ret.path = lean_path;
 617
 618     ret.sum = g_malloc0(256);
 619     g_strlcpy(ret.sum, pair[1], 66);
 620
 621     g_regex_unref(prefix);
 622     g_regex_unref(right);
 623     g_regex_unref(posix);
 624
 625     return ret;
 626 }
 627
 628 /* TODO need to deconstruct tz_table on exit
 629 static gboolean build_lookup_table() {
 630
 631         gchar *find_cmd, **map_pairs, *find_output, *path_buf, *sum_buf, **entry_buf;
 632         GError *err;
 633         gboolean ret;
 634         gint i;
 635
 636         i   = 0;
 637         err = NULL;
 638         ret = TRUE;
 639
 640         find_cmd    = (gchar *) g_malloc0(4096);
 641         find_output = (gchar *) g_malloc0(1000000);
 642
 643         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);
 644
 645         if(!g_spawn_command_line_sync(find_cmd, &find_output, NULL, NULL, &err)) {
 646
 647             g_printf("error running `%s`\n", find_cmd);
 648             ret = FALSE;
 649         }
 650
 651         map_pairs = g_strsplit(find_output, "\n", INT_MAX);
 652
 653         while(map_pairs[i] && (entry_buf = g_strsplit(map_pairs[i], "=", INT_MAX))) {
 654
 655             tz_table[i] = parse_timezone_path(entry_buf);
 656
 657             g_strfreev(entry_buf);
 658             i++;
 659         }
 660
 661         g_free(find_output);
 662         g_free(find_cmd);
 663         g_free(map_pairs);
 664
 665         return ret;
 666 }
 667
 668 static gchar *lookup_hash(gchar *hash) {
 669
 670     gint i = 0;
 671
 672     while(tz_table[i].sum)
 673         if(!g_strcmp0(tz_table[i].sum, hash))
 674             return tz_table[i].path;
 675         else
 676             i++;
 677
 678     return NULL;
 679 }*/
 680
 681 /* takes number of microseconds since epoch and returns a
 682  * ptr to a timespec suitable to be passed to clock_settime(3)
 683  */
 684 static struct timespec* mktimespec(gint64 us) {
 685
 686     long nanoseconds;
 687     time_t seconds;
 688
 689     gint64 div_buf_remainder, div_buf_s, div_buf_ns;
 690     struct timespec *ret;
 691
 692     div_buf_s         = (us / 1000000); /* us / 10^6 = s */
 693     div_buf_remainder = (us % 1000000); /* fraction of second lost from prev. line */
 694     div_buf_ns        = div_buf_remainder * 1000; /* us * 10^3 = ns */
 695
 696     seconds     = (time_t) div_buf_s; /* porting note: most systems use 32 bit time, adjust accordingly */
 697     nanoseconds = (long)   div_buf_ns;
 698
 699     ret = (struct timespec *) calloc(1, sizeof(struct timespec));
 700
 701     ret->tv_sec  = seconds;
 702     ret->tv_nsec = nanoseconds;
 703
 704     g_ptr_array_add(timedated_freeable, ret);
 705
 706     return ret;
 707 }