add get_[static/dynamic/pretty]hostname functionality
[systembsd.git] / src / interfaces / hostnamed / hostnamed.c
CommitLineData
baa40e28 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
71e3eef1 17#include <unistd.h>
18#include <limits.h>
3eb1ef91 19#include <signal.h>
ed99526e 20
043bd2ed 21#include <sys/param.h>
8f3d38b1 22#include <string.h>
043bd2ed 23
cd16a588 24#include <glib/gprintf.h>
ba9914b6 25#include <glib-unix.h>
cd16a588 26
3c3794ac 27#include "hostnamed-gen.h"
3eb1ef91 28#include "hostnamed.h"
71e3eef1 29
ed99526e 30GPtrArray *hostnamed_freeable;
9d2500b0 31Hostname1 *hostnamed_interf;
7ce16a35 32
3eb1ef91 33GMainLoop *hostnamed_loop;
34
35guint bus_descriptor;
36gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
37
ff036f75 38/* --- begin method/property/dbus signal code --- */
355f60ae 39
7ce16a35 40static gboolean
9d2500b0 41on_handle_set_hostname(Hostname1 *hn1_passed_interf,
7ce16a35 42 GDBusMethodInvocation *invoc,
43 const gchar *greet,
44 gpointer data) {
45 return FALSE;
46}
47
48static gboolean
9d2500b0 49on_handle_set_static_hostname(Hostname1 *hn1_passed_interf,
7ce16a35 50 GDBusMethodInvocation *invoc,
51 const gchar *greet,
52 gpointer data) {
53 return FALSE;
54}
55
56static gboolean
9d2500b0 57on_handle_set_pretty_hostname(Hostname1 *hn1_passed_interf,
7ce16a35 58 GDBusMethodInvocation *invoc,
59 const gchar *greet,
60 gpointer data) {
61 return FALSE;
62}
63
64static gboolean
9d2500b0 65on_handle_set_chassis(Hostname1 *hn1_passed_interf,
7ce16a35 66 GDBusMethodInvocation *invoc,
67 const gchar *greet,
68 gpointer data) {
69 return FALSE;
70}
71
72static gboolean
9d2500b0 73on_handle_set_icon_name(Hostname1 *hn1_passed_interf,
7ce16a35 74 GDBusMethodInvocation *invoc,
75 const gchar *greet,
76 gpointer data) {
77 return FALSE;
78}
79
355f60ae 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
86const gchar *
87our_get_hostname() {
88
99ef55dd 89 gchar *hostname_buf, *ret;
90 size_t hostname_divider;
043bd2ed 91
8e18351c 92 hostname_buf = (gchar*) g_malloc0(MAXHOSTNAMELEN);
99ef55dd 93 ret = (gchar*) g_malloc0(MAXHOSTNAMELEN);
8e18351c 94
99ef55dd 95 g_ptr_array_add(hostnamed_freeable, hostname_buf);
96 g_ptr_array_add(hostnamed_freeable, ret);
af9f8b50 97
8e18351c 98 if(gethostname(hostname_buf, MAXHOSTNAMELEN) || g_strcmp0(hostname_buf, "") == 0)
99 return "localhost";
043bd2ed 100
99ef55dd 101 hostname_divider = strcspn(hostname_buf, ".");
8f3d38b1 102
99ef55dd 103 return strncpy(ret, hostname_buf, hostname_divider);
355f60ae 104}
105
106const gchar *
107our_get_static_hostname() {
108
8e18351c 109 gchar *pretty_hostname;
110 gchar *ret;
111
112 pretty_hostname = our_get_pretty_hostname();
113
114 if(g_strcmp0(pretty_hostname, "") == 0)
115 ret = our_get_hostname();
116
117 else if(ret = g_hostname_to_ascii(pretty_hostname)) {
118
119 g_ptr_array_add(hostnamed_freeable, ret);
120 return ret;
121 }
122
123 return ret;
355f60ae 124}
125
126const gchar *
127our_get_pretty_hostname() {
128
8e18351c 129 GKeyFile *config;
130 gchar *ret;
131
132 if(g_key_file_load_from_file(config, "/etc/systemd_compat.conf", G_KEY_FILE_NONE, NULL)
133 && ret = g_key_file_get_value(config, "hostnamed", "PrettyHostname", NULL)) { /* ret might need to be freed, docs dont specify but i am suspicious */
134
135 g_free(config);
136 return ret;
137 }
138
139 if(config)
140 g_free(config);
141
142 return "";
355f60ae 143}
144
145const gchar *
146our_get_chassis() {
147
148 return "TODO";
149}
150
151const gchar *
152our_get_icon_name() {
153
154 return "TODO";
155}
156
157const gchar *
158our_get_kernel_name() {
159
160 return "TODO";
161}
162
163const gchar *
164our_get_kernel_version() {
165
166 return "TODO";
167}
168
169const gchar *
170our_get_kernel_release() {
171
172 return "TODO";
173}
174
175const gchar *
176our_get_os_cpename() {
177
178 return "TODO";
179}
180
181const gchar *
182our_get_os_pretty_name() {
183
184 return "TODO";
185}
186
ff036f75 187/* --- end method/property/dbus signal code, begin bus/name handlers --- */
0df0018d 188
828caf9a 189static void hostnamed_on_bus_acquired(GDBusConnection *conn,
fbc0295f 190 const gchar *name,
191 gpointer user_data) {
11475670 192
3eb1ef91 193 g_printf("got bus/name, exporting %s's interface...\n", name);
11475670 194
99ef55dd 195 hostnamed_interf = hostname1_skeleton_new();
7ce16a35 196
355f60ae 197 /* attach function pointers to generated struct's method handlers */
7ce16a35 198 g_signal_connect(hostnamed_interf, "handle-set-hostname", G_CALLBACK(on_handle_set_hostname), NULL);
199 g_signal_connect(hostnamed_interf, "handle-set-static-hostname", G_CALLBACK(on_handle_set_static_hostname), NULL);
200 g_signal_connect(hostnamed_interf, "handle-set-pretty-hostname", G_CALLBACK(on_handle_set_pretty_hostname), NULL);
201 g_signal_connect(hostnamed_interf, "handle-set-chassis", G_CALLBACK(on_handle_set_chassis), NULL);
202 g_signal_connect(hostnamed_interf, "handle-set-icon-name", G_CALLBACK(on_handle_set_icon_name), NULL);
203
355f60ae 204 /* set our properties before export */
9d2500b0 205 hostname1_set_hostname(hostnamed_interf, our_get_hostname());
206 hostname1_set_static_hostname(hostnamed_interf, our_get_static_hostname());
207 hostname1_set_pretty_hostname(hostnamed_interf, our_get_pretty_hostname());
208 hostname1_set_chassis(hostnamed_interf, our_get_chassis());
209 hostname1_set_icon_name(hostnamed_interf, our_get_icon_name());
210 hostname1_set_kernel_name(hostnamed_interf, our_get_kernel_name());
211 hostname1_set_kernel_version(hostnamed_interf, our_get_kernel_version());
212 hostname1_set_kernel_release(hostnamed_interf, our_get_kernel_release());
213 hostname1_set_operating_system_cpename(hostnamed_interf, our_get_os_cpename());
214 hostname1_set_operating_system_pretty_name(hostnamed_interf, our_get_os_pretty_name());
355f60ae 215
7ce16a35 216 if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(hostnamed_interf),
9d2500b0 217 conn,
218 "/org/freedesktop/hostname1",
219 NULL)) {
7ce16a35 220
3eb1ef91 221 g_printf("failed to export %s's interface!\n", name); /* unusual edge case, TODO check errno */
99ef55dd 222 hostnamed_mem_clean();
7ce16a35 223
3eb1ef91 224 } else {
ea207ed3 225
99ef55dd 226 dbus_interface_exported = TRUE;
227 g_printf("exported %s's interface on the system bus...\n", name);
228 }
3eb1ef91 229}
3c3794ac 230
3eb1ef91 231static void hostnamed_on_name_acquired(GDBusConnection *conn,
99ef55dd 232 const gchar *name,
3eb1ef91 233 gpointer user_data) {
234
235 g_printf("success!\n");
3c3794ac 236}
237
828caf9a 238static void hostnamed_on_name_lost(GDBusConnection *conn,
9d2500b0 239 const gchar *name,
240 gpointer user_data) {
80043b36 241
99ef55dd 242 if(!conn) {
3eb1ef91 243
99ef55dd 244 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);
245 hostnamed_mem_clean();
246 }
3eb1ef91 247
ca5a7f9f 248 g_printf("lost name %s, exiting...\n", name);
ed99526e 249
fbc0295f 250 hostnamed_mem_clean();
3eb1ef91 251}
252
253/* --- end bus/name handlers, begin misc unix functions --- */
254
255/* safe call to clean and then exit
ca5a7f9f 256 * this stops our GMainLoop safely before letting main() return */
3eb1ef91 257void hostnamed_mem_clean() {
258
99ef55dd 259 g_printf("exiting...\n");
3eb1ef91 260
99ef55dd 261 if(dbus_interface_exported)
262 g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(hostnamed_interf));
3eb1ef91 263
99ef55dd 264 if(g_main_loop_is_running(hostnamed_loop))
265 g_main_loop_quit(hostnamed_loop);
ed99526e 266
ea207ed3 267}
268
3eb1ef91 269/* wrapper for glib's unix signal handling; called only once if terminatating signal is raised against us */
270gboolean unix_sig_terminate_handler(gpointer data) {
a3041e78 271
99ef55dd 272 g_printf("caught SIGINT/HUP/TERM, exiting\n");
3eb1ef91 273
99ef55dd 274 hostnamed_mem_clean();
275 return G_SOURCE_REMOVE;
3eb1ef91 276}
277
278void set_signal_handlers() {
279
99ef55dd 280 /* we don't care about its descriptor, we never need to unregister these */
281 g_unix_signal_add(SIGINT, unix_sig_terminate_handler, NULL);
282 g_unix_signal_add(SIGHUP, unix_sig_terminate_handler, NULL);
283 g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
5c2460ab 284
99ef55dd 285 /* TODO: the "only once" guarantee only counts towards specific signals.
286 * make sure calling a SIGINT and SIGHUP doesn't cause term_handler()
287 * to be called twice */
3eb1ef91 288}
289
290int main() {
99ef55dd 291
292 set_signal_handlers();
387173cb 293
99ef55dd 294 hostnamed_loop = g_main_loop_new(NULL, TRUE);
295 hostnamed_freeable = g_ptr_array_new();
ed99526e 296
99ef55dd 297 bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
3eb1ef91 298 "org.freedesktop.hostname1",
299 G_BUS_NAME_OWNER_FLAGS_NONE,
300 hostnamed_on_bus_acquired,
301 hostnamed_on_name_acquired,
302 hostnamed_on_name_lost,
303 NULL,
304 NULL);
496f5d66 305
99ef55dd 306 g_main_loop_run(hostnamed_loop);
307 /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
308 g_main_loop_unref(hostnamed_loop);
3c3794ac 309
99ef55dd 310 /* guaranteed unownable */
311 g_bus_unown_name(bus_descriptor);
a3041e78 312
99ef55dd 313 /* at this point no operations can occur with our data, it is safe to free it + its container */
314 g_ptr_array_free(hostnamed_freeable, TRUE);
af9f8b50 315
99ef55dd 316 return 0;
71e3eef1 317}
318
6981850a 319/* TODO figure out DMI variables on obsd */
71e3eef1 320/*static gchar *guess_icon_name() {
321
322 gchar *filebuf = NULL;
323 gchar *ret = NULL;
324
fbc0295f 325 #if defined(__i386__) || defined(__x86_64__)
c3b84b0a 326
71e3eef1 327 Taken with a few minor changes from systemd's hostnamed.c,
328 copyright 2011 Lennart Poettering.
329
330 See the SMBIOS Specification 2.7.1 section 7.4.1 for
331 details about the values listed here:
332
333 http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf
c3b84b0a 334
71e3eef1 335
336 if (g_file_get_contents ("/sys/class/dmi/id/chassis_type", &filebuf, NULL, NULL)) {
337 switch (g_ascii_strtoull (filebuf, NULL, 10)) {
338 case 0x3:
339 case 0x4:
340 case 0x5:
341 case 0x6:
342 case 0x7:
343 ret = g_strdup ("computer-desktop");
344 goto out;
345 case 0x9:
346 case 0xA:
347 case 0xE:
348 ret = g_strdup ("computer-laptop");
349 goto out;
350 case 0x11:
351 case 0x17:
352 case 0x1C:
353 case 0x1D:
354 ret = g_strdup ("computer-server");
355 goto out;
356 }
357 }
fbc0295f 358 #endif
71e3eef1 359 ret = g_strdup ("computer");
360 out:
361 g_free (filebuf);
362 return ret;
363}*/
3c3794ac 364