| 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/param.h> |
| 22 | #include <sys/sysctl.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include <glib/gprintf.h> |
| 26 | #include <glib-unix.h> |
| 27 | |
| 28 | #include "hostnamed-gen.h" |
| 29 | #include "hostnamed.h" |
| 30 | |
| 31 | GPtrArray *hostnamed_freeable; |
| 32 | Hostname1 *hostnamed_interf; |
| 33 | |
| 34 | GMainLoop *hostnamed_loop; |
| 35 | |
| 36 | guint bus_descriptor; |
| 37 | gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */ |
| 38 | |
| 39 | /* --- begin method/property/dbus signal code --- */ |
| 40 | |
| 41 | /* add any sysctl strings that suggest virtualization here */ |
| 42 | const gchar* vmstring_list[] = { |
| 43 | "QEMU Virtual CPU", |
| 44 | "SmartDC HVM", |
| 45 | "KVM", |
| 46 | "VirtualBox" |
| 47 | }; |
| 48 | |
| 49 | static gboolean is_vm; |
| 50 | |
| 51 | static gboolean |
| 52 | on_handle_set_hostname(Hostname1 *hn1_passed_interf, |
| 53 | GDBusMethodInvocation *invoc, |
| 54 | const gchar *greet, |
| 55 | gpointer data) { |
| 56 | return FALSE; |
| 57 | } |
| 58 | |
| 59 | static gboolean |
| 60 | on_handle_set_static_hostname(Hostname1 *hn1_passed_interf, |
| 61 | GDBusMethodInvocation *invoc, |
| 62 | const gchar *greet, |
| 63 | gpointer data) { |
| 64 | return FALSE; |
| 65 | } |
| 66 | |
| 67 | static gboolean |
| 68 | on_handle_set_pretty_hostname(Hostname1 *hn1_passed_interf, |
| 69 | GDBusMethodInvocation *invoc, |
| 70 | const gchar *greet, |
| 71 | gpointer data) { |
| 72 | return FALSE; |
| 73 | } |
| 74 | |
| 75 | static gboolean |
| 76 | on_handle_set_chassis(Hostname1 *hn1_passed_interf, |
| 77 | GDBusMethodInvocation *invoc, |
| 78 | const gchar *greet, |
| 79 | gpointer data) { |
| 80 | return FALSE; |
| 81 | } |
| 82 | |
| 83 | static gboolean |
| 84 | on_handle_set_icon_name(Hostname1 *hn1_passed_interf, |
| 85 | GDBusMethodInvocation *invoc, |
| 86 | const gchar *greet, |
| 87 | gpointer data) { |
| 88 | return FALSE; |
| 89 | } |
| 90 | |
| 91 | /* note: all hostnamed/hostname1's properties are read-only, |
| 92 | * and do not need set_ functions, gdbus-codegen realized |
| 93 | * this from the XML and handled the to-be error of trying |
| 94 | * to set a read-only property's value |
| 95 | */ |
| 96 | |
| 97 | const gchar * |
| 98 | our_get_hostname() { |
| 99 | |
| 100 | gchar *hostname_buf, *ret; |
| 101 | size_t hostname_divider; |
| 102 | |
| 103 | hostname_buf = (gchar*) g_malloc0(MAXHOSTNAMELEN); |
| 104 | ret = (gchar*) g_malloc0(MAXHOSTNAMELEN); |
| 105 | |
| 106 | g_ptr_array_add(hostnamed_freeable, hostname_buf); |
| 107 | g_ptr_array_add(hostnamed_freeable, ret); |
| 108 | |
| 109 | if(gethostname(hostname_buf, MAXHOSTNAMELEN) || g_strcmp0(hostname_buf, "") == 0) |
| 110 | return "localhost"; |
| 111 | |
| 112 | hostname_divider = strcspn(hostname_buf, "."); |
| 113 | |
| 114 | return strncpy(ret, hostname_buf, hostname_divider); |
| 115 | } |
| 116 | |
| 117 | const gchar * |
| 118 | our_get_static_hostname() { |
| 119 | |
| 120 | const gchar *pretty_hostname; |
| 121 | const gchar *ret; |
| 122 | |
| 123 | pretty_hostname = our_get_pretty_hostname(); |
| 124 | |
| 125 | if(g_strcmp0(pretty_hostname, "") == 0) |
| 126 | ret = our_get_hostname(); |
| 127 | |
| 128 | else if((ret = g_hostname_to_ascii(pretty_hostname))) { |
| 129 | |
| 130 | g_ptr_array_add(hostnamed_freeable, (gpointer)ret); |
| 131 | return ret; |
| 132 | } |
| 133 | |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | const gchar * |
| 138 | our_get_pretty_hostname() { |
| 139 | |
| 140 | GKeyFile *config; |
| 141 | gchar *ret; |
| 142 | |
| 143 | config = g_key_file_new(); |
| 144 | |
| 145 | if(g_key_file_load_from_file(config, "/etc/systemd_compat.conf", G_KEY_FILE_NONE, NULL) |
| 146 | && (ret = g_key_file_get_value(config, "hostnamed", "PrettyHostname", NULL))) { /* ret might need to be freed, docs dont specify but i am suspicious */ |
| 147 | |
| 148 | g_key_file_unref(config); |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | if(config) |
| 153 | g_free(config); |
| 154 | |
| 155 | return ""; |
| 156 | } |
| 157 | |
| 158 | const gchar * |
| 159 | our_get_chassis() { |
| 160 | |
| 161 | char *hwproduct, *hwmodel; |
| 162 | size_t hwproduct_size, hwmodel_size; |
| 163 | int hwproduct_name[2], hwmodel_name[2]; |
| 164 | |
| 165 | hwproduct_name[0] = CTL_HW; |
| 166 | hwproduct_name[1] = HW_PRODUCT; |
| 167 | |
| 168 | hwmodel_name[0] = CTL_HW; |
| 169 | hwmodel_name[1] = HW_MODEL; |
| 170 | |
| 171 | /* pass NULL buffer to check size first, then pass hw to be filled according to freshly-set hw_size */ |
| 172 | if(sysctl(&hwproduct_name, 2, NULL, &hwproduct_size, NULL, 0) || sysctl(&hwproduct_name, 2, hwproduct, &hwproduct_size, NULL, 0)) |
| 173 | return "desktop"; /* TODO error properly here */ |
| 174 | |
| 175 | if(sysctl(&hwmodel_name, 2, NULL, &hwmodel_size, NULL, 0) || sysctl(&hwmodel_name, 2, hwmodel, &hwmodel_size, NULL, 0)) |
| 176 | return "desktop"; /* TODO error properly here */ |
| 177 | |
| 178 | if(test_against_known_vm_strings(hwproduct) || test_against_known_vm_strings(hwmodel)) |
| 179 | return "vm"; /*TODO differentiate between VMs (hardware virt, seperate kernel) and containers (paravirt, shared kernel) |
| 180 | |
| 181 | /* TODO: test for laptop, if not, dmidecode for desktop vs. server |
| 182 | * probably move this code to vm test func and set a global after running it early, once */ |
| 183 | |
| 184 | return "desktop"; |
| 185 | } |
| 186 | |
| 187 | const gchar * |
| 188 | our_get_icon_name() { |
| 189 | |
| 190 | return "TODO"; |
| 191 | } |
| 192 | |
| 193 | const gchar * |
| 194 | our_get_kernel_name() { |
| 195 | |
| 196 | return "TODO"; |
| 197 | } |
| 198 | |
| 199 | const gchar * |
| 200 | our_get_kernel_version() { |
| 201 | |
| 202 | return "TODO"; |
| 203 | } |
| 204 | |
| 205 | const gchar * |
| 206 | our_get_kernel_release() { |
| 207 | |
| 208 | return "TODO"; |
| 209 | } |
| 210 | |
| 211 | const gchar * |
| 212 | our_get_os_cpename() { |
| 213 | |
| 214 | return "TODO"; |
| 215 | } |
| 216 | |
| 217 | const gchar * |
| 218 | our_get_os_pretty_name() { |
| 219 | |
| 220 | return "TODO"; |
| 221 | } |
| 222 | |
| 223 | /* --- end method/property/dbus signal code, begin bus/name handlers --- */ |
| 224 | |
| 225 | static void hostnamed_on_bus_acquired(GDBusConnection *conn, |
| 226 | const gchar *name, |
| 227 | gpointer user_data) { |
| 228 | |
| 229 | g_printf("got bus/name, exporting %s's interface...\n", name); |
| 230 | |
| 231 | hostnamed_interf = hostname1_skeleton_new(); |
| 232 | |
| 233 | /* attach function pointers to generated struct's method handlers */ |
| 234 | g_signal_connect(hostnamed_interf, "handle-set-hostname", G_CALLBACK(on_handle_set_hostname), NULL); |
| 235 | g_signal_connect(hostnamed_interf, "handle-set-static-hostname", G_CALLBACK(on_handle_set_static_hostname), NULL); |
| 236 | g_signal_connect(hostnamed_interf, "handle-set-pretty-hostname", G_CALLBACK(on_handle_set_pretty_hostname), NULL); |
| 237 | g_signal_connect(hostnamed_interf, "handle-set-chassis", G_CALLBACK(on_handle_set_chassis), NULL); |
| 238 | g_signal_connect(hostnamed_interf, "handle-set-icon-name", G_CALLBACK(on_handle_set_icon_name), NULL); |
| 239 | |
| 240 | /* set our properties before export */ |
| 241 | hostname1_set_hostname(hostnamed_interf, our_get_hostname()); |
| 242 | hostname1_set_static_hostname(hostnamed_interf, our_get_static_hostname()); |
| 243 | hostname1_set_pretty_hostname(hostnamed_interf, our_get_pretty_hostname()); |
| 244 | hostname1_set_chassis(hostnamed_interf, our_get_chassis()); |
| 245 | hostname1_set_icon_name(hostnamed_interf, our_get_icon_name()); |
| 246 | hostname1_set_kernel_name(hostnamed_interf, our_get_kernel_name()); |
| 247 | hostname1_set_kernel_version(hostnamed_interf, our_get_kernel_version()); |
| 248 | hostname1_set_kernel_release(hostnamed_interf, our_get_kernel_release()); |
| 249 | hostname1_set_operating_system_cpename(hostnamed_interf, our_get_os_cpename()); |
| 250 | hostname1_set_operating_system_pretty_name(hostnamed_interf, our_get_os_pretty_name()); |
| 251 | |
| 252 | if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(hostnamed_interf), |
| 253 | conn, |
| 254 | "/org/freedesktop/hostname1", |
| 255 | NULL)) { |
| 256 | |
| 257 | g_printf("failed to export %s's interface!\n", name); /* unusual edge case, TODO check errno */ |
| 258 | hostnamed_mem_clean(); |
| 259 | |
| 260 | } else { |
| 261 | |
| 262 | dbus_interface_exported = TRUE; |
| 263 | g_printf("exported %s's interface on the system bus...\n", name); |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | static void hostnamed_on_name_acquired(GDBusConnection *conn, |
| 268 | const gchar *name, |
| 269 | gpointer user_data) { |
| 270 | |
| 271 | g_printf("success!\n"); |
| 272 | } |
| 273 | |
| 274 | static void hostnamed_on_name_lost(GDBusConnection *conn, |
| 275 | const gchar *name, |
| 276 | gpointer user_data) { |
| 277 | |
| 278 | if(!conn) { |
| 279 | |
| 280 | 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); |
| 281 | hostnamed_mem_clean(); |
| 282 | } |
| 283 | |
| 284 | g_printf("lost name %s, exiting...\n", name); |
| 285 | |
| 286 | hostnamed_mem_clean(); |
| 287 | } |
| 288 | |
| 289 | /* --- end bus/name handlers, begin misc unix functions --- */ |
| 290 | |
| 291 | /* safe call to clean and then exit |
| 292 | * this stops our GMainLoop safely before letting main() return */ |
| 293 | void hostnamed_mem_clean() { |
| 294 | |
| 295 | g_printf("exiting...\n"); |
| 296 | |
| 297 | if(dbus_interface_exported) |
| 298 | g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(hostnamed_interf)); |
| 299 | |
| 300 | if(g_main_loop_is_running(hostnamed_loop)) |
| 301 | g_main_loop_quit(hostnamed_loop); |
| 302 | |
| 303 | } |
| 304 | |
| 305 | /* wrapper for glib's unix signal handling; called only once if terminatating signal is raised against us */ |
| 306 | gboolean unix_sig_terminate_handler(gpointer data) { |
| 307 | |
| 308 | g_printf("caught SIGINT/HUP/TERM, exiting\n"); |
| 309 | |
| 310 | hostnamed_mem_clean(); |
| 311 | return G_SOURCE_REMOVE; |
| 312 | } |
| 313 | |
| 314 | void set_signal_handlers() { |
| 315 | |
| 316 | /* we don't care about its descriptor, we never need to unregister these */ |
| 317 | g_unix_signal_add(SIGINT, unix_sig_terminate_handler, NULL); |
| 318 | g_unix_signal_add(SIGHUP, unix_sig_terminate_handler, NULL); |
| 319 | g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL); |
| 320 | |
| 321 | /* TODO: the "only once" guarantee only counts towards specific signals. |
| 322 | * make sure calling a SIGINT and SIGHUP doesn't cause term_handler() |
| 323 | * to be called twice */ |
| 324 | } |
| 325 | |
| 326 | int main() { |
| 327 | |
| 328 | set_signal_handlers(); |
| 329 | |
| 330 | hostnamed_loop = g_main_loop_new(NULL, TRUE); |
| 331 | hostnamed_freeable = g_ptr_array_new(); |
| 332 | |
| 333 | bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM, |
| 334 | "org.freedesktop.hostname1", |
| 335 | G_BUS_NAME_OWNER_FLAGS_NONE, |
| 336 | hostnamed_on_bus_acquired, |
| 337 | hostnamed_on_name_acquired, |
| 338 | hostnamed_on_name_lost, |
| 339 | NULL, |
| 340 | NULL); |
| 341 | |
| 342 | g_main_loop_run(hostnamed_loop); |
| 343 | /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */ |
| 344 | g_main_loop_unref(hostnamed_loop); |
| 345 | |
| 346 | /* guaranteed unownable */ |
| 347 | g_bus_unown_name(bus_descriptor); |
| 348 | |
| 349 | /* at this point no operations can occur with our data, it is safe to free it + its container */ |
| 350 | g_ptr_array_free(hostnamed_freeable, TRUE); |
| 351 | |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | gboolean test_against_known_vm_strings(gchar *sysctl_string) { |
| 356 | |
| 357 | unsigned int i; |
| 358 | |
| 359 | if(is_vm) |
| 360 | return TRUE; |
| 361 | |
| 362 | for(; i < G_N_ELEMENTS(vmstring_list); i++) |
| 363 | if(strcasestr(sysctl_string, vmstring_list[i])) |
| 364 | return (is_vm = TRUE) ? TRUE : FALSE; |
| 365 | |
| 366 | return FALSE; |
| 367 | } |
| 368 | |
| 369 | /* TODO figure out DMI variables on obsd */ |
| 370 | /*static gchar *guess_icon_name() { |
| 371 | |
| 372 | gchar *filebuf = NULL; |
| 373 | gchar *ret = NULL; |
| 374 | |
| 375 | #if defined(__i386__) || defined(__x86_64__) |
| 376 | |
| 377 | Taken with a few minor changes from systemd's hostnamed.c, |
| 378 | copyright 2011 Lennart Poettering. |
| 379 | |
| 380 | See the SMBIOS Specification 2.7.1 section 7.4.1 for |
| 381 | details about the values listed here: |
| 382 | |
| 383 | http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf |
| 384 | |
| 385 | |
| 386 | if (g_file_get_contents ("/sys/class/dmi/id/chassis_type", &filebuf, NULL, NULL)) { |
| 387 | switch (g_ascii_strtoull (filebuf, NULL, 10)) { |
| 388 | case 0x3: |
| 389 | case 0x4: |
| 390 | case 0x5: |
| 391 | case 0x6: |
| 392 | case 0x7: |
| 393 | ret = g_strdup ("computer-desktop"); |
| 394 | goto out; |
| 395 | case 0x9: |
| 396 | case 0xA: |
| 397 | case 0xE: |
| 398 | ret = g_strdup ("computer-laptop"); |
| 399 | goto out; |
| 400 | case 0x11: |
| 401 | case 0x17: |
| 402 | case 0x1C: |
| 403 | case 0x1D: |
| 404 | ret = g_strdup ("computer-server"); |
| 405 | goto out; |
| 406 | } |
| 407 | } |
| 408 | #endif |
| 409 | ret = g_strdup ("computer"); |
| 410 | out: |
| 411 | g_free (filebuf); |
| 412 | return ret; |
| 413 | }*/ |
| 414 | |