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
  21 #include <sys/param.h>
  22 #include <string.h>
  23
  24 #include <glib/gprintf.h>
  25 #include <glib-unix.h>
  26
  27 #include "hostnamed-gen.h"
  28 #include "hostnamed.h"
  29
  30 GPtrArray *hostnamed_freeable;
  31 Hostname1 *hostnamed_interf;
  32
  33 GMainLoop *hostnamed_loop;
  34
  35 guint bus_descriptor;
  36 gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
  37
  38 /* --- begin method/property/dbus signal code --- */
  39
  40 static gboolean
  41 on_handle_set_hostname(Hostname1 *hn1_passed_interf,
  42                        GDBusMethodInvocation *invoc,
  43                        const gchar *greet,
  44                        gpointer data) {
  45     return FALSE;
  46 }
  47
  48 static gboolean
  49 on_handle_set_static_hostname(Hostname1 *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_pretty_hostname(Hostname1 *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_chassis(Hostname1 *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_icon_name(Hostname1 *hn1_passed_interf,
  74                         GDBusMethodInvocation *invoc,
  75                         const gchar *greet,
  76                         gpointer data) {
  77     return FALSE;
  78 }
  79
  80 /* note: all hostnamed/hostname1's properties are read-only,
  81  * and do not need set_ functions, gdbus-codegen realized
  82  * this from the XML and handled the to-be error of trying
  83  * to set a read-only property's value
  84  */
  85
  86 const gchar *
  87 our_get_hostname() {
  88
  89         gchar *hostname_buf, *ret;
  90         size_t hostname_divider;
  91
  92         hostname_buf = (gchar*) g_malloc0(MAXHOSTNAMELEN); /* todo check & free */
  93         ret          = (gchar*) g_malloc0(MAXHOSTNAMELEN);
  94         g_ptr_array_add(hostnamed_freeable, hostname_buf);
  95         g_ptr_array_add(hostnamed_freeable, ret);
  96
  97         if(gethostname(hostname_buf, MAXHOSTNAMELEN))
  98                 return "";
  99
 100         hostname_divider = strcspn(hostname_buf, ".");
 101
 102         return strncpy(ret, hostname_buf, hostname_divider);
 103 }
 104
 105 const gchar *
 106 our_get_static_hostname() {
 107
 108     return "TODO";
 109 }
 110
 111 const gchar *
 112 our_get_pretty_hostname() {
 113
 114     return "TODO";
 115 }
 116
 117 const gchar *
 118 our_get_chassis() {
 119
 120     return "TODO";
 121 }
 122
 123 const gchar *
 124 our_get_icon_name() {
 125
 126     return "TODO";
 127 }
 128
 129 const gchar *
 130 our_get_kernel_name() {
 131
 132     return "TODO";
 133 }
 134
 135 const gchar *
 136 our_get_kernel_version() {
 137
 138     return "TODO";
 139 }
 140
 141 const gchar *
 142 our_get_kernel_release() {
 143
 144     return "TODO";
 145 }
 146
 147 const gchar *
 148 our_get_os_cpename() {
 149
 150     return "TODO";
 151 }
 152
 153 const gchar *
 154 our_get_os_pretty_name() {
 155
 156     return "TODO";
 157 }
 158
 159 /* --- end method/property/dbus signal code, begin bus/name handlers --- */
 160
 161 static void hostnamed_on_bus_acquired(GDBusConnection *conn,
 162                             const gchar *name,
 163                             gpointer user_data) {
 164
 165     g_printf("got bus/name, exporting %s's interface...\n", name);
 166
 167         hostnamed_interf = hostname1_skeleton_new();
 168
 169     /* attach function pointers to generated struct's method handlers */
 170     g_signal_connect(hostnamed_interf, "handle-set-hostname", G_CALLBACK(on_handle_set_hostname), NULL);
 171     g_signal_connect(hostnamed_interf, "handle-set-static-hostname", G_CALLBACK(on_handle_set_static_hostname), NULL);
 172     g_signal_connect(hostnamed_interf, "handle-set-pretty-hostname", G_CALLBACK(on_handle_set_pretty_hostname), NULL);
 173     g_signal_connect(hostnamed_interf, "handle-set-chassis", G_CALLBACK(on_handle_set_chassis), NULL);
 174     g_signal_connect(hostnamed_interf, "handle-set-icon-name", G_CALLBACK(on_handle_set_icon_name), NULL);
 175
 176     /* set our properties before export */
 177     hostname1_set_hostname(hostnamed_interf, our_get_hostname());
 178     hostname1_set_static_hostname(hostnamed_interf, our_get_static_hostname());
 179     hostname1_set_pretty_hostname(hostnamed_interf, our_get_pretty_hostname());
 180     hostname1_set_chassis(hostnamed_interf, our_get_chassis());
 181     hostname1_set_icon_name(hostnamed_interf, our_get_icon_name());
 182     hostname1_set_kernel_name(hostnamed_interf, our_get_kernel_name());
 183     hostname1_set_kernel_version(hostnamed_interf, our_get_kernel_version());
 184     hostname1_set_kernel_release(hostnamed_interf, our_get_kernel_release());
 185     hostname1_set_operating_system_cpename(hostnamed_interf, our_get_os_cpename());
 186     hostname1_set_operating_system_pretty_name(hostnamed_interf, our_get_os_pretty_name());
 187
 188     if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(hostnamed_interf),
 189                                          conn,
 190                                          "/org/freedesktop/hostname1",
 191                                          NULL)) {
 192
 193         g_printf("failed to export %s's interface!\n", name); /* unusual edge case, TODO check errno */
 194                 hostnamed_mem_clean();
 195
 196     } else {
 197
 198                 dbus_interface_exported = TRUE;
 199                 g_printf("exported %s's interface on the system bus...\n", name);
 200         }
 201 }
 202
 203 static void hostnamed_on_name_acquired(GDBusConnection *conn,
 204                                            const gchar *name,
 205                                        gpointer user_data) {
 206
 207     g_printf("success!\n");
 208 }
 209
 210 static void hostnamed_on_name_lost(GDBusConnection *conn,
 211                                    const gchar *name,
 212                                    gpointer user_data) {
 213
 214         if(!conn) {
 215
 216                 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);
 217                 hostnamed_mem_clean();
 218         }
 219
 220     g_printf("lost name %s, exiting...\n", name);
 221
 222     hostnamed_mem_clean();
 223 }
 224
 225 /* --- end bus/name handlers, begin misc unix functions --- */
 226
 227 /* safe call to clean and then exit
 228  * this stops our GMainLoop safely before letting main() return */
 229 void hostnamed_mem_clean() {
 230
 231         g_printf("exiting...\n");
 232
 233         if(dbus_interface_exported)
 234                 g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(hostnamed_interf));
 235
 236         if(g_main_loop_is_running(hostnamed_loop))
 237                 g_main_loop_quit(hostnamed_loop);
 238
 239 }
 240
 241 /* wrapper for glib's unix signal handling; called only once if terminatating signal is raised against us */
 242 gboolean unix_sig_terminate_handler(gpointer data) {
 243
 244         g_printf("caught SIGINT/HUP/TERM, exiting\n");
 245
 246         hostnamed_mem_clean();
 247         return G_SOURCE_REMOVE;
 248 }
 249
 250 void set_signal_handlers() {
 251
 252         /* we don't care about its descriptor, we never need to unregister these */
 253         g_unix_signal_add(SIGINT,  unix_sig_terminate_handler, NULL);
 254         g_unix_signal_add(SIGHUP,  unix_sig_terminate_handler, NULL);
 255         g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
 256
 257         /* TODO: the "only once" guarantee only counts towards specific signals.
 258          *       make sure calling a SIGINT and SIGHUP doesn't cause term_handler()
 259          *       to be called twice */
 260 }
 261
 262 int main() {
 263
 264         set_signal_handlers();
 265
 266         hostnamed_loop = g_main_loop_new(NULL, TRUE);
 267         hostnamed_freeable = g_ptr_array_new();
 268
 269         bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
 270                                    "org.freedesktop.hostname1",
 271                                    G_BUS_NAME_OWNER_FLAGS_NONE,
 272                                    hostnamed_on_bus_acquired,
 273                                    hostnamed_on_name_acquired,
 274                                    hostnamed_on_name_lost,
 275                                    NULL,
 276                                    NULL);
 277
 278         g_main_loop_run(hostnamed_loop);
 279         /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
 280         g_main_loop_unref(hostnamed_loop);
 281
 282         /* guaranteed unownable */
 283         g_bus_unown_name(bus_descriptor);
 284
 285         /* at this point no operations can occur with our data, it is safe to free it + its container */
 286         g_ptr_array_free(hostnamed_freeable, TRUE);
 287
 288         return 0;
 289 }
 290
 291 /* TODO figure out DMI variables on obsd */
 292 /*static gchar *guess_icon_name() {
 293
 294     gchar *filebuf = NULL;
 295     gchar *ret = NULL;
 296
 297     #if defined(__i386__) || defined(__x86_64__)
 298
 299        Taken with a few minor changes from systemd's hostnamed.c,
 300        copyright 2011 Lennart Poettering.
 301
 302        See the SMBIOS Specification 2.7.1 section 7.4.1 for
 303        details about the values listed here:
 304
 305        http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf
 306
 307
 308     if (g_file_get_contents ("/sys/class/dmi/id/chassis_type", &filebuf, NULL, NULL)) {
 309         switch (g_ascii_strtoull (filebuf, NULL, 10)) {
 310         case 0x3:
 311         case 0x4:
 312         case 0x5:
 313         case 0x6:
 314         case 0x7:
 315             ret = g_strdup ("computer-desktop");
 316             goto out;
 317         case 0x9:
 318         case 0xA:
 319         case 0xE:
 320             ret = g_strdup ("computer-laptop");
 321             goto out;
 322         case 0x11:
 323         case 0x17:
 324         case 0x1C:
 325         case 0x1D:
 326             ret = g_strdup ("computer-server");
 327             goto out;
 328         }
 329     }
 330     #endif
 331     ret = g_strdup ("computer");
 332   out:
 333     g_free (filebuf);
 334     return ret;
 335 }*/
 336