src/interfaces/hostnamed/hostnamed.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 #include <string.h>
  21
  22 #include <sys/param.h>
  23 #include <sys/sysctl.h>
  24 #include <sys/sensors.h>
  25 #include <sys/ioctl.h>
  26 #include <sys/utsname.h>
  27
  28 #include <machine/apmvar.h>
  29
  30 #include <glib/gprintf.h>
  31 #include <glib-unix.h>
  32 /* #include <gtk/gtk.h> */
  33
  34 #include "hostnamed-gen.h"
  35 #include "hostnamed.h"
  36
  37 /* format: {
  38  *           (1) string to be matched against runtime machine's sysctl output.
  39  *               can be either the exact string or a substring contained
  40  *               within sysctl strings. no "guesses" here, a match should
  41  *               reliably indicate the chassis/icon.
  42  *
  43  *           (2) string describing chassis type divulged by (1).
  44  *               must be one of "desktop", "laptop", "server",
  45  *               "tablet", "handset", "vm", "container" or NULL
  46  *               if only icon string can be ascertained. "vm" refers
  47  *               to operating systems running on baremetal hypervisors
  48  *               (hardware virtualization, like XEN) while "container"
  49  *               refers to OSs running on shared hypervisors like
  50  *               virtualbox or VMware. consider the distinction carefully
  51  *               as common virtualization software like KVM may share
  52  *               characteristics of both "vm" and "container" types.
  53  *
  54  *           (3) string specifying icon to use. follows XDG icon spec.
  55  *               see http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html
  56  *               for allowed strings.
  57  *
  58  *           (4) chassis precedence bit. TRUE if (2) is defined and
  59  *               we're certain it is the proper string. FALSE in the
  60  *               circumstance (2) may be the correct string, unless
  61  *               a match with this bit set to TRUE overrides it.
  62  *               if (2) is NULL, this bit is inconsequential.
  63  *
  64  *           (5) icon precedence bit. see previous definition.
  65  *         }                                               */
  66 struct SYSCTL_LOOKUP_TABLE {
  67     gchar    *match_string;
  68     gchar    *chassis;
  69     gchar    *icon;
  70     gboolean chassis_precedence;
  71     gboolean icon_precedence;
  72 };
  73
  74 GPtrArray *hostnamed_freeable;
  75 Hostname1 *hostnamed_interf;
  76
  77 GMainLoop *hostnamed_loop;
  78
  79 guint bus_descriptor;
  80 gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
  81
  82 gchar *CHASSIS, *ICON;
  83 gchar *OS_CPENAME;
  84 gchar *KERN_NAME, *KERN_RELEASE, *KERN_VERS;
  85
  86 /* TODO no specific vm or laptop icon in gnome
  87  * NOTE paravirtualization on xen is only available for linuxes right now
  88  * dmesg on linux systems reveals xen and virtualization method (HVM or PVM)
  89  * but we will worry about those later */
  90
  91 /* add any sysctl strings that suggest virtualization here */
  92 const struct SYSCTL_LOOKUP_TABLE chassis_indicator_table[] =
  93 {
  94     { "QEMU Virtual CPU",        "vm",        NULL,              FALSE, FALSE }, /* could be QEMU running in userspace or as part of KVM */
  95     { "KVM",                     "vm",        "drive-multidisk", FALSE, FALSE },
  96     { "SmartDC HVM",             "vm",        "drive-multidisk", TRUE,  TRUE  }, /* illumos-joyent kvm */
  97     { "VirtualBox",              "vm",        "drive-multidisk", TRUE,  TRUE  },
  98     { "VMware, Inc.",            "vm",        "drive-multidisk", TRUE,  TRUE  },
  99     { "VMware Virtual Platform", "vm",        "drive-multidisk", TRUE,  TRUE  },
 100     { "Parallels",               "vm",        "drive-multidisk", TRUE,  TRUE  }, /* need verification */
 101     { "Xen",                     "vm",        "drive-multidisk", FALSE, FALSE }
 102 }; /* TODO: chroots, etc. are the actual "containers", add them */
 103
 104 /* archs to check against when determining if machine is server */
 105 const gchar *server_archs[] = {
 106     "hppa",
 107     "sparc",
 108     "sparc64"
 109 };
 110
 111 /* --- begin method/property/dbus signal code --- */
 112
 113 /* TODO the extra boolean passed to these funcs is for policykit auth */
 114 /* TODO complete call with error, message, etc */
 115 static gboolean
 116 on_handle_set_hostname(Hostname1 *hn1_passed_interf,
 117                        GDBusMethodInvocation *invoc,
 118                        const gchar *greet,
 119                        gpointer data) {
 120     GVariant *params;
 121     gchar *proposed_hostname, *valid_hostname_buf;
 122     gboolean policykit_auth, ret;
 123     size_t check_length, bad_length;
 124
 125     bad_length = MAXHOSTNAMELEN + 1;
 126     proposed_hostname = NULL;
 127     ret = FALSE;
 128
 129     params = g_dbus_method_invocation_get_parameters(invoc);
 130     g_variant_get(params, "(sb)", &proposed_hostname, &policykit_auth);
 131
 132     if(proposed_hostname && (valid_hostname_buf = g_hostname_to_ascii(proposed_hostname))) {
 133
 134         check_length = strnlen(proposed_hostname, bad_length);
 135
 136         if(check_length < bad_length && !sethostname(proposed_hostname, check_length))
 137             ret = TRUE;
 138     }
 139
 140     hostname1_complete_set_hostname(hn1_passed_interf, invoc);
 141
 142     if(proposed_hostname)
 143         g_free(proposed_hostname);
 144     if(valid_hostname_buf)
 145         g_free(valid_hostname_buf);
 146
 147     return ret;
 148 }
 149
 150 static gboolean
 151 on_handle_set_static_hostname(Hostname1 *hn1_passed_interf,
 152                               GDBusMethodInvocation *invoc,
 153                               const gchar *greet,
 154                               gpointer data) {
 155     return FALSE;
 156 }
 157
 158 static gboolean
 159 on_handle_set_pretty_hostname(Hostname1 *hn1_passed_interf,
 160                               GDBusMethodInvocation *invoc,
 161                               const gchar *greet,
 162                               gpointer data) {
 163     return FALSE;
 164 }
 165
 166 static gboolean
 167 on_handle_set_chassis(Hostname1 *hn1_passed_interf,
 168                       GDBusMethodInvocation *invoc,
 169                       const gchar *greet,
 170                       gpointer data) {
 171     return FALSE;
 172 }
 173
 174 static gboolean
 175 on_handle_set_icon_name(Hostname1 *hn1_passed_interf,
 176                         GDBusMethodInvocation *invoc,
 177                         const gchar *greet,
 178                         gpointer data) {
 179     return FALSE;
 180 }
 181
 182 /* note: all hostnamed/hostname1's properties are read-only,
 183  * and do not need set_ functions, gdbus-codegen realized
 184  * this from the XML and handled the to-be error of trying
 185  * to set a read-only property's value
 186  */
 187
 188 const gchar *
 189 our_get_hostname() {
 190
 191     gchar *hostname_buf, *ret;
 192     size_t hostname_divider;
 193
 194     hostname_buf = (gchar*) g_malloc0(MAXHOSTNAMELEN);
 195     ret          = (gchar*) g_malloc0(MAXHOSTNAMELEN);
 196
 197     g_ptr_array_add(hostnamed_freeable, hostname_buf);
 198     g_ptr_array_add(hostnamed_freeable, ret);
 199
 200     if(gethostname(hostname_buf, MAXHOSTNAMELEN) || g_strcmp0(hostname_buf, "") == 0)
 201         return "localhost";
 202
 203     hostname_divider = strcspn(hostname_buf, ".");
 204
 205     return strncpy(ret, hostname_buf, hostname_divider);
 206 }
 207
 208 const gchar *
 209 our_get_static_hostname() {
 210
 211     const gchar *pretty_hostname;
 212     const gchar *ret;
 213
 214     pretty_hostname = our_get_pretty_hostname();
 215
 216     if(g_strcmp0(pretty_hostname, "") == 0)
 217         ret = our_get_hostname();
 218
 219     else if((ret = g_hostname_to_ascii(pretty_hostname))) {
 220
 221         g_ptr_array_add(hostnamed_freeable, (gpointer)ret);
 222         return ret;
 223     }
 224
 225     return ret;
 226 }
 227
 228 const gchar *
 229 our_get_pretty_hostname() {
 230
 231     GKeyFile *config;
 232     gchar *ret;
 233
 234     config = g_key_file_new();
 235
 236     if(g_key_file_load_from_file(config, "/etc/systemd_compat.conf", G_KEY_FILE_NONE, NULL)
 237         && (ret = g_key_file_get_value(config, "hostnamed", "PrettyHostname", NULL))) { /* ret might need to be freed, docs dont specify but i am suspicious */
 238
 239         g_key_file_unref(config);
 240         return ret;
 241     }
 242
 243     if(config)
 244         g_free(config);
 245
 246     return "";
 247 }
 248
 249 const gchar *
 250 our_get_chassis() {
 251
 252    if(CHASSIS)
 253         return CHASSIS;
 254
 255     return "desktop";
 256 }
 257
 258 const gchar *
 259 our_get_icon_name() {
 260
 261     if(ICON)
 262         return ICON;
 263
 264     return "";
 265 }
 266
 267 const gchar *
 268 our_get_kernel_name() {
 269
 270     if(KERN_NAME)
 271         return KERN_NAME;
 272
 273     return "";
 274 }
 275
 276 const gchar *
 277 our_get_kernel_version() {
 278
 279     if(KERN_VERS)
 280         return KERN_VERS;
 281
 282     return "";
 283 }
 284
 285 const gchar *
 286 our_get_kernel_release() {
 287
 288     if(KERN_RELEASE)
 289         return KERN_RELEASE;
 290
 291     return "";
 292 }
 293
 294 const gchar *
 295 our_get_os_cpename() {
 296
 297     return "ONEDAY";
 298 }
 299
 300 const gchar *
 301 our_get_os_pretty_name() {
 302
 303     return "OpenBSD";
 304 }
 305
 306 /* --- end method/property/dbus signal code, begin bus/name handlers --- */
 307
 308 static void hostnamed_on_bus_acquired(GDBusConnection *conn,
 309                             const gchar *name,
 310                             gpointer user_data) {
 311
 312     g_printf("got bus/name, exporting %s's interface...\n", name);
 313
 314     hostnamed_interf = hostname1_skeleton_new();
 315
 316     /* attach function pointers to generated struct's method handlers */
 317     g_signal_connect(hostnamed_interf, "handle-set-hostname", G_CALLBACK(on_handle_set_hostname), NULL);
 318     g_signal_connect(hostnamed_interf, "handle-set-static-hostname", G_CALLBACK(on_handle_set_static_hostname), NULL);
 319     g_signal_connect(hostnamed_interf, "handle-set-pretty-hostname", G_CALLBACK(on_handle_set_pretty_hostname), NULL);
 320     g_signal_connect(hostnamed_interf, "handle-set-chassis", G_CALLBACK(on_handle_set_chassis), NULL);
 321     g_signal_connect(hostnamed_interf, "handle-set-icon-name", G_CALLBACK(on_handle_set_icon_name), NULL);
 322
 323     /* set our properties before export */
 324     hostname1_set_hostname(hostnamed_interf, our_get_hostname());
 325     hostname1_set_static_hostname(hostnamed_interf, our_get_static_hostname());
 326     hostname1_set_pretty_hostname(hostnamed_interf, our_get_pretty_hostname());
 327     hostname1_set_chassis(hostnamed_interf, our_get_chassis());
 328     hostname1_set_icon_name(hostnamed_interf, our_get_icon_name());
 329     hostname1_set_kernel_name(hostnamed_interf, our_get_kernel_name());
 330     hostname1_set_kernel_version(hostnamed_interf, our_get_kernel_version());
 331     hostname1_set_kernel_release(hostnamed_interf, our_get_kernel_release());
 332     hostname1_set_operating_system_cpename(hostnamed_interf, our_get_os_cpename());
 333     hostname1_set_operating_system_pretty_name(hostnamed_interf, our_get_os_pretty_name());
 334
 335     if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(hostnamed_interf),
 336                                          conn,
 337                                          "/org/freedesktop/hostname1",
 338                                          NULL)) {
 339
 340         g_printf("failed to export %s's interface!\n", name); /* unusual edge case, TODO check errno */
 341         hostnamed_mem_clean();
 342
 343     } else {
 344
 345         dbus_interface_exported = TRUE;
 346         g_printf("exported %s's interface on the system bus...\n", name);
 347     }
 348 }
 349
 350 static void hostnamed_on_name_acquired(GDBusConnection *conn,
 351                                        const gchar *name,
 352                                        gpointer user_data) {
 353
 354     g_printf("success!\n");
 355 }
 356
 357 static void hostnamed_on_name_lost(GDBusConnection *conn,
 358                                    const gchar *name,
 359                                    gpointer user_data) {
 360
 361     if(!conn) {
 362
 363         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);
 364         hostnamed_mem_clean();
 365     }
 366
 367     g_printf("lost name %s, exiting...\n", name);
 368
 369     hostnamed_mem_clean();
 370 }
 371
 372 /* --- end bus/name handlers, begin misc unix functions --- */
 373
 374 /* safe call to clean and then exit
 375  * this stops our GMainLoop safely before letting main() return */
 376 void hostnamed_mem_clean() {
 377
 378     g_printf("exiting...\n");
 379
 380     if(dbus_interface_exported)
 381         g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(hostnamed_interf));
 382
 383     if(g_main_loop_is_running(hostnamed_loop))
 384         g_main_loop_quit(hostnamed_loop);
 385
 386 }
 387
 388 /* wrapper for glib's unix signal handling; called only once if terminatating signal is raised against us */
 389 gboolean unix_sig_terminate_handler(gpointer data) {
 390
 391     g_printf("caught SIGINT/HUP/TERM, exiting\n");
 392
 393     hostnamed_mem_clean();
 394     return G_SOURCE_REMOVE;
 395 }
 396
 397 void set_signal_handlers() {
 398
 399     /* we don't care about its descriptor, we never need to unregister these */
 400     g_unix_signal_add(SIGINT,  unix_sig_terminate_handler, NULL);
 401     g_unix_signal_add(SIGHUP,  unix_sig_terminate_handler, NULL);
 402     g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
 403
 404     /* TODO: the "only once" guarantee only counts towards specific signals.
 405      *       make sure calling a SIGINT and SIGHUP doesn't cause term_handler()
 406      *       to be called twice */
 407 }
 408
 409 int main() {
 410
 411     hostnamed_freeable = g_ptr_array_new();
 412
 413     /* TODO: check for valid, writable config at init. if no, complain to `make install` */
 414
 415     CHASSIS = ICON = OS_CPENAME = 0;
 416     KERN_NAME = KERN_RELEASE = KERN_VERS = 0;
 417
 418     set_signal_handlers();
 419
 420     if(!determine_chassis_and_icon() || !set_uname_properties())
 421         return 1;
 422
 423     hostnamed_loop     = g_main_loop_new(NULL, TRUE);
 424
 425     bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
 426                                    "org.freedesktop.hostname1",
 427                                    G_BUS_NAME_OWNER_FLAGS_NONE,
 428                                    hostnamed_on_bus_acquired,
 429                                    hostnamed_on_name_acquired,
 430                                    hostnamed_on_name_lost,
 431                                    NULL,
 432                                    NULL);
 433
 434     g_main_loop_run(hostnamed_loop);
 435     /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
 436     g_main_loop_unref(hostnamed_loop);
 437
 438     /* guaranteed unownable */
 439     g_bus_unown_name(bus_descriptor);
 440
 441     /* at this point no operations can occur with our data, it is safe to free it + its container */
 442     g_ptr_array_free(hostnamed_freeable, TRUE);
 443
 444     return 0;
 445 }
 446
 447 gboolean set_uname_properties() {
 448
 449     struct utsname un;
 450
 451     if(-1 == uname(&un))
 452         return FALSE;
 453
 454     KERN_NAME = (gchar*)g_malloc0(sizeof(un.sysname));
 455     g_ptr_array_add(hostnamed_freeable, KERN_NAME);
 456     g_strlcpy(KERN_NAME, un.sysname, sizeof(un.sysname));
 457
 458     KERN_RELEASE = (gchar*)g_malloc0(sizeof(un.release));
 459     g_ptr_array_add(hostnamed_freeable, KERN_RELEASE);
 460     g_strlcpy(KERN_RELEASE, un.release, sizeof(un.release));
 461
 462     KERN_VERS = (gchar*)g_malloc0(sizeof(un.version));
 463     g_ptr_array_add(hostnamed_freeable, KERN_VERS);
 464     g_strlcpy(KERN_VERS, un.version, sizeof(un.version));
 465
 466     return TRUE;
 467 }
 468
 469 gboolean determine_chassis_and_icon() {
 470
 471     const size_t bufsize = 4096;
 472
 473     char *hwproduct, *hwmodel, *hwvendor, *hwmachine;
 474     size_t hwproduct_size, hwmodel_size, hwvendor_size, hwmachine_size;
 475     int hwproduct_name[2], hwmodel_name[2], hwvendor_name[2], hwmachine_name[2];
 476     unsigned int i;
 477     gboolean UNSURE_CHASSIS_FLAG, UNSURE_ICON_FLAG;
 478
 479     hwproduct_size = hwmodel_size = hwvendor_size = hwmachine_size = bufsize;
 480     UNSURE_CHASSIS_FLAG = UNSURE_ICON_FLAG = FALSE;
 481     i = 0;
 482
 483     hwproduct = (char*)g_malloc0(4096);
 484     hwmodel   = (char*)g_malloc0(4096);
 485     hwvendor  = (char*)g_malloc0(4096);
 486     hwmachine = (char*)g_malloc0(4096);
 487
 488     g_ptr_array_add(hostnamed_freeable, hwproduct);
 489     g_ptr_array_add(hostnamed_freeable, hwmodel);
 490     g_ptr_array_add(hostnamed_freeable, hwvendor);
 491     g_ptr_array_add(hostnamed_freeable, hwmachine);
 492
 493     hwproduct_name[0] = CTL_HW;
 494     hwproduct_name[1] = HW_PRODUCT;
 495
 496     hwmodel_name[0] = CTL_HW;
 497     hwmodel_name[1] = HW_MODEL;
 498
 499     hwvendor_name[0] = CTL_HW;
 500     hwvendor_name[1] = HW_VENDOR;
 501
 502     hwmachine_name[0] = CTL_HW;
 503     hwmachine_name[1] = HW_MACHINE;
 504
 505     /* pass NULL buffer to check size first, then pass hw to be filled according to freshly-set hw_size */
 506     if(-1 == sysctl(hwproduct_name, 2, NULL, &hwproduct_size, NULL, 0) || -1 == sysctl(hwproduct_name, 2, hwproduct, &hwproduct_size, NULL, 0))
 507         return FALSE;
 508
 509     if(-1 == sysctl(hwmodel_name, 2, NULL, &hwmodel_size, NULL, 0) || -1 == sysctl(hwmodel_name, 2, hwmodel, &hwmodel_size, NULL, 0))
 510         return FALSE;
 511
 512     if(-1 == sysctl(hwvendor_name, 2, NULL, &hwvendor_size, NULL, 0) || -1 == sysctl(hwvendor_name, 2, hwvendor, &hwvendor_size, NULL, 0))
 513         return FALSE;
 514
 515     if(-1 == sysctl(hwmachine_name, 2, NULL, &hwmachine_size, NULL, 0) || -1 == sysctl(hwmachine_name, 2, hwmachine, &hwmachine_size, NULL, 0))
 516         return FALSE;
 517
 518     /* TODO: test for laptop, if not, dmidecode for desktop vs. server
 519      *       probably move this code to vm test func and set a global after running it early, once */
 520
 521     for(; i < G_N_ELEMENTS(chassis_indicator_table); i++) {
 522         if(strcasestr(hwproduct,    chassis_indicator_table[i].match_string)
 523             || strcasestr(hwmodel,  chassis_indicator_table[i].match_string)
 524             || strcasestr(hwvendor, chassis_indicator_table[i].match_string)) {
 525
 526             if(!UNSURE_CHASSIS_FLAG && chassis_indicator_table[i].chassis) {
 527
 528                 UNSURE_CHASSIS_FLAG = chassis_indicator_table[i].chassis_precedence;
 529                 CHASSIS = chassis_indicator_table[i].chassis;
 530             }
 531
 532             if(!UNSURE_ICON_FLAG && chassis_indicator_table[i].icon) {
 533
 534                 UNSURE_ICON_FLAG = chassis_indicator_table[i].icon_precedence;
 535                 ICON = chassis_indicator_table[i].icon;
 536             }
 537         }
 538     }
 539
 540     if(up_native_is_laptop()) {
 541
 542         if(!CHASSIS)
 543             CHASSIS = "laptop";
 544         if(!ICON)
 545             ICON = "input-touchpad"; /* TODO pull an icon package that actually has the icons we're looking for */
 546
 547     } else if(is_server(hwmachine)) {
 548
 549         if(!CHASSIS)
 550             CHASSIS = "server";
 551         if(!ICON)
 552             ICON = "uninterruptible-power-supply";
 553
 554     } else if(!CHASSIS || !ICON) {
 555
 556         if(!CHASSIS)
 557             CHASSIS = "desktop";
 558         if(!ICON)
 559             ICON = "computer";
 560     }
 561
 562     return (CHASSIS && ICON);
 563 }
 564
 565 gboolean is_server(gchar *arch) {
 566
 567     unsigned int i;
 568
 569     for(; i < G_N_ELEMENTS(server_archs); i++)
 570         if(strcasestr(arch, server_archs[i]))
 571             return TRUE;
 572
 573     return FALSE;
 574 }
 575
 576 gboolean up_native_is_laptop() {
 577
 578     struct apm_power_info bstate;
 579     struct sensordev acpiac;
 580
 581     if (up_native_get_sensordev("acpiac0", &acpiac))
 582         return TRUE;
 583
 584     if (-1 == ioctl(up_apm_get_fd(), APM_IOC_GETPOWER, &bstate))
 585         g_error("ioctl on apm fd failed : %s", g_strerror(errno));
 586
 587     return bstate.ac_state != APM_AC_UNKNOWN;
 588 }
 589
 590 int up_apm_get_fd() {
 591
 592     static int apm_fd = 0;
 593
 594     if(apm_fd == 0) {
 595
 596         g_debug("apm_fd is not initialized yet, opening");
 597
 598         /* open /dev/apm */
 599         if((apm_fd = open("/dev/apm", O_RDONLY)) == -1) {
 600             if(errno != ENXIO && errno != ENOENT)
 601                 g_error("cannot open device file");
 602         }
 603     }
 604
 605     return apm_fd;
 606 }
 607
 608 gboolean up_native_get_sensordev(const char * id, struct sensordev * snsrdev) {
 609
 610     int devn;
 611     size_t sdlen = sizeof(struct sensordev);
 612     int mib[] = {CTL_HW, HW_SENSORS, 0, 0 ,0};
 613
 614     for (devn = 0 ; ; devn++) {
 615         mib[2] = devn;
 616         if(sysctl(mib, 3, snsrdev, &sdlen, NULL, 0) == -1) {
 617             if(errno == ENXIO)
 618                 continue;
 619             if(errno == ENOENT)
 620                 break;
 621         }
 622
 623         if (!strcmp(snsrdev->xname, id))
 624             return TRUE;
 625     }
 626
 627     return FALSE;
 628 }