1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2 
3 #include <errno.h>
4 #include <sys/utsname.h>
5 #include <sys/stat.h>
6 #include <sys/types.h>
7 #include <unistd.h>
8 
9 #include "alloc-util.h"
10 #include "bus-common-errors.h"
11 #include "bus-get-properties.h"
12 #include "bus-log-control-api.h"
13 #include "bus-polkit.h"
14 #include "def.h"
15 #include "env-file-label.h"
16 #include "env-file.h"
17 #include "env-util.h"
18 #include "fileio-label.h"
19 #include "fileio.h"
20 #include "hostname-setup.h"
21 #include "hostname-util.h"
22 #include "id128-util.h"
23 #include "json.h"
24 #include "main-func.h"
25 #include "missing_capability.h"
26 #include "nscd-flush.h"
27 #include "nulstr-util.h"
28 #include "os-util.h"
29 #include "parse-util.h"
30 #include "path-util.h"
31 #include "sd-device.h"
32 #include "selinux-util.h"
33 #include "service-util.h"
34 #include "signal-util.h"
35 #include "stat-util.h"
36 #include "string-table.h"
37 #include "strv.h"
38 #include "user-util.h"
39 #include "util.h"
40 #include "virt.h"
41 
42 #define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
43 
44 /* Properties we cache are indexed by an enum, to make invalidation easy and systematic (as we can iterate
45  * through them all, and they are uniformly strings). */
46 typedef enum {
47         /* Read from /etc/hostname */
48         PROP_STATIC_HOSTNAME,
49 
50         /* Read from /etc/machine-info */
51         PROP_PRETTY_HOSTNAME,
52         PROP_ICON_NAME,
53         PROP_CHASSIS,
54         PROP_DEPLOYMENT,
55         PROP_LOCATION,
56         PROP_HARDWARE_VENDOR,
57         PROP_HARDWARE_MODEL,
58 
59         /* Read from /etc/os-release (or /usr/lib/os-release) */
60         PROP_OS_PRETTY_NAME,
61         PROP_OS_CPE_NAME,
62         PROP_OS_HOME_URL,
63         _PROP_MAX,
64         _PROP_INVALID = -EINVAL,
65 } HostProperty;
66 
67 typedef struct Context {
68         char *data[_PROP_MAX];
69 
70         HostnameSource hostname_source;
71 
72         struct stat etc_hostname_stat;
73         struct stat etc_os_release_stat;
74         struct stat etc_machine_info_stat;
75 
76         Hashmap *polkit_registry;
77 } Context;
78 
context_reset(Context * c,uint64_t mask)79 static void context_reset(Context *c, uint64_t mask) {
80         assert(c);
81 
82         for (int p = 0; p < _PROP_MAX; p++) {
83                 if (!FLAGS_SET(mask, UINT64_C(1) << p))
84                         continue;
85 
86                 c->data[p] = mfree(c->data[p]);
87         }
88 }
89 
context_destroy(Context * c)90 static void context_destroy(Context *c) {
91         assert(c);
92 
93         context_reset(c, UINT64_MAX);
94         bus_verify_polkit_async_registry_free(c->polkit_registry);
95 }
96 
context_read_etc_hostname(Context * c)97 static void context_read_etc_hostname(Context *c) {
98         struct stat current_stat = {};
99         int r;
100 
101         assert(c);
102 
103         if (stat("/etc/hostname", &current_stat) >= 0 &&
104             stat_inode_unmodified(&c->etc_hostname_stat, &current_stat))
105                 return;
106 
107         context_reset(c, UINT64_C(1) << PROP_STATIC_HOSTNAME);
108 
109         r = read_etc_hostname(NULL, &c->data[PROP_STATIC_HOSTNAME]);
110         if (r < 0 && r != -ENOENT)
111                 log_warning_errno(r, "Failed to read /etc/hostname, ignoring: %m");
112 
113         c->etc_hostname_stat = current_stat;
114 }
115 
context_read_machine_info(Context * c)116 static void context_read_machine_info(Context *c) {
117         struct stat current_stat = {};
118         int r;
119 
120         assert(c);
121 
122         if (stat("/etc/machine-info", &current_stat) >= 0 &&
123             stat_inode_unmodified(&c->etc_machine_info_stat, &current_stat))
124                 return;
125 
126         context_reset(c,
127                       (UINT64_C(1) << PROP_PRETTY_HOSTNAME) |
128                       (UINT64_C(1) << PROP_ICON_NAME) |
129                       (UINT64_C(1) << PROP_CHASSIS) |
130                       (UINT64_C(1) << PROP_DEPLOYMENT) |
131                       (UINT64_C(1) << PROP_LOCATION) |
132                       (UINT64_C(1) << PROP_HARDWARE_VENDOR) |
133                       (UINT64_C(1) << PROP_HARDWARE_MODEL));
134 
135         r = parse_env_file(NULL, "/etc/machine-info",
136                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
137                            "ICON_NAME", &c->data[PROP_ICON_NAME],
138                            "CHASSIS", &c->data[PROP_CHASSIS],
139                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
140                            "LOCATION", &c->data[PROP_LOCATION],
141                            "HARDWARE_VENDOR", &c->data[PROP_HARDWARE_VENDOR],
142                            "HARDWARE_MODEL", &c->data[PROP_HARDWARE_MODEL]);
143         if (r < 0 && r != -ENOENT)
144                 log_warning_errno(r, "Failed to read /etc/machine-info, ignoring: %m");
145 
146         c->etc_machine_info_stat = current_stat;
147 }
148 
context_read_os_release(Context * c)149 static void context_read_os_release(Context *c) {
150         struct stat current_stat = {};
151         int r;
152 
153         assert(c);
154 
155         if ((stat("/etc/os-release", &current_stat) >= 0 ||
156              stat("/usr/lib/os-release", &current_stat) >= 0) &&
157             stat_inode_unmodified(&c->etc_os_release_stat, &current_stat))
158                 return;
159 
160         context_reset(c,
161                       (UINT64_C(1) << PROP_OS_PRETTY_NAME) |
162                       (UINT64_C(1) << PROP_OS_CPE_NAME) |
163                       (UINT64_C(1) << PROP_OS_HOME_URL));
164 
165         r = parse_os_release(NULL,
166                              "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
167                              "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
168                              "HOME_URL", &c->data[PROP_OS_HOME_URL]);
169         if (r < 0 && r != -ENOENT)
170                 log_warning_errno(r, "Failed to read os-release file, ignoring: %m");
171 
172         c->etc_os_release_stat = current_stat;
173 }
174 
get_dmi_data(const char * database_key,const char * regular_key,char ** ret)175 static int get_dmi_data(const char *database_key, const char *regular_key, char **ret) {
176         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
177         _cleanup_free_ char *b = NULL;
178         const char *s = NULL;
179         int r;
180 
181         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
182         if (r < 0)
183                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
184 
185         if (database_key)
186                 (void) sd_device_get_property_value(device, database_key, &s);
187         if (!s && regular_key)
188                 (void) sd_device_get_property_value(device, regular_key, &s);
189 
190         if (!ret)
191                 return !!s;
192 
193         if (s) {
194                 b = strdup(s);
195                 if (!b)
196                         return -ENOMEM;
197         }
198 
199         *ret = TAKE_PTR(b);
200         return !!s;
201 }
202 
get_hardware_vendor(char ** ret)203 static int get_hardware_vendor(char **ret) {
204         return get_dmi_data("ID_VENDOR_FROM_DATABASE", "ID_VENDOR", ret);
205 }
206 
get_hardware_model(char ** ret)207 static int get_hardware_model(char **ret) {
208         return get_dmi_data("ID_MODEL_FROM_DATABASE", "ID_MODEL", ret);
209 }
210 
get_hardware_firmware_data(const char * sysattr,char ** ret)211 static int get_hardware_firmware_data(const char *sysattr, char **ret) {
212         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
213         _cleanup_free_ char *b = NULL;
214         const char *s = NULL;
215         int r;
216 
217         assert(sysattr);
218 
219         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
220         if (r < 0)
221                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
222 
223         (void) sd_device_get_sysattr_value(device, sysattr, &s);
224         if (!isempty(s)) {
225                 b = strdup(s);
226                 if (!b)
227                         return -ENOMEM;
228         }
229 
230         if (ret)
231                 *ret = TAKE_PTR(b);
232 
233         return !isempty(s);
234 }
235 
get_hardware_serial(char ** ret)236 static int get_hardware_serial(char **ret) {
237          int r;
238 
239          r = get_hardware_firmware_data("product_serial", ret);
240          if (r <= 0)
241                 return get_hardware_firmware_data("board_serial", ret);
242 
243          return r;
244 }
245 
get_firmware_version(char ** ret)246 static int get_firmware_version(char **ret) {
247          return get_hardware_firmware_data("bios_version", ret);
248 }
249 
valid_chassis(const char * chassis)250 static const char* valid_chassis(const char *chassis) {
251         assert(chassis);
252 
253         return nulstr_get(
254                         "vm\0"
255                         "container\0"
256                         "desktop\0"
257                         "laptop\0"
258                         "convertible\0"
259                         "server\0"
260                         "tablet\0"
261                         "handset\0"
262                         "watch\0"
263                         "embedded\0",
264                         chassis);
265 }
266 
valid_deployment(const char * deployment)267 static bool valid_deployment(const char *deployment) {
268         assert(deployment);
269 
270         return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
271 }
272 
fallback_chassis(void)273 static const char* fallback_chassis(void) {
274         const char *chassis;
275         _cleanup_free_ char *type = NULL;
276         Virtualization v;
277         unsigned t;
278         int r;
279 
280         v = detect_virtualization();
281         if (v < 0)
282                 log_debug_errno(v, "Failed to detect virtualization, ignoring: %m");
283         else if (VIRTUALIZATION_IS_VM(v))
284                 return "vm";
285         else if (VIRTUALIZATION_IS_CONTAINER(v))
286                 return "container";
287 
288         r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
289         if (r < 0) {
290                 log_debug_errno(r, "Failed to read DMI chassis type, ignoring: %m");
291                 goto try_acpi;
292         }
293 
294         r = safe_atou(type, &t);
295         if (r < 0) {
296                 log_debug_errno(r, "Failed to parse DMI chassis type \"%s\", ignoring: %m", type);
297                 goto try_acpi;
298         }
299 
300         /* We only list the really obvious cases here. The DMI data is unreliable enough, so let's not do any
301          * additional guesswork on top of that.
302          *
303          * See the SMBIOS Specification 3.5.0 section 7.4.1 for details about the values listed here:
304          *
305          * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.5.0.pdf
306          */
307 
308         switch (t) {
309 
310         case 0x03: /* Desktop */
311         case 0x04: /* Low Profile Desktop */
312         case 0x06: /* Mini Tower */
313         case 0x07: /* Tower */
314         case 0x0D: /* All in one (i.e. PC built into monitor) */
315         case 0x23: /* Mini PC */
316         case 0x24: /* Stick PC */
317                 return "desktop";
318 
319         case 0x8: /* Portable */
320         case 0x9: /* Laptop */
321         case 0xA: /* Notebook */
322         case 0xE: /* Sub Notebook */
323                 return "laptop";
324 
325         case 0xB: /* Hand Held */
326                 return "handset";
327 
328         case 0x11: /* Main Server Chassis */
329         case 0x1C: /* Blade */
330         case 0x1D: /* Blade Enclosure */
331                 return "server";
332 
333         case 0x1E: /* Tablet */
334                 return "tablet";
335 
336         case 0x1F: /* Convertible */
337         case 0x20: /* Detachable */
338                 return "convertible";
339 
340         case 0x21: /* IoT Gateway */
341         case 0x22: /* Embedded PC */
342                 return "embedded";
343 
344         default:
345                 log_debug("Unhandled DMI chassis type 0x%02x, ignoring.", t);
346         }
347 
348 try_acpi:
349         type = mfree(type);
350         r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
351         if (r < 0) {
352                 log_debug_errno(r, "Failed read ACPI PM profile, ignoring: %m");
353                 goto try_devicetree;
354         }
355 
356         r = safe_atou(type, &t);
357         if (r < 0) {
358                 log_debug_errno(r, "Failed parse ACPI PM profile \"%s\", ignoring: %m", type);
359                 goto try_devicetree;
360         }
361 
362         /* We only list the really obvious cases here as the ACPI data is not really super reliable.
363          *
364          * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
365          *
366          * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
367          */
368 
369         switch (t) {
370 
371         case 1: /* Desktop */
372         case 3: /* Workstation */
373         case 6: /* Appliance PC */
374                 return "desktop";
375 
376         case 2: /* Mobile */
377                 return "laptop";
378 
379         case 4: /* Enterprise Server */
380         case 5: /* SOHO Server */
381         case 7: /* Performance Server */
382                 return "server";
383 
384         case 8: /* Tablet */
385                 return "tablet";
386 
387         default:
388                 log_debug("Unhandled ACPI PM profile 0x%02x, ignoring.", t);
389         }
390 
391 try_devicetree:
392         type = mfree(type);
393         r = read_one_line_file("/proc/device-tree/chassis-type", &type);
394         if (r < 0) {
395                 log_debug_errno(r, "Failed to read device-tree chassis type, ignoring: %m");
396                 return NULL;
397         }
398 
399         /* Note that the Devicetree specification uses the very same vocabulary
400          * of chassis types as we do, hence we do not need to translate these types:
401          *
402          * https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter3-devicenodes.rst */
403         chassis = valid_chassis(type);
404         if (!chassis)
405                 log_debug("Invalid device-tree chassis type \"%s\", ignoring.", type);
406         return chassis;
407 }
408 
context_get_chassis(Context * c)409 static char* context_get_chassis(Context *c) {
410         const char *fallback;
411         char *dmi;
412 
413         assert(c);
414 
415         if (!isempty(c->data[PROP_CHASSIS]))
416                 return strdup(c->data[PROP_CHASSIS]);
417 
418         if (get_dmi_data("ID_CHASSIS", NULL, &dmi) >= 0)
419                 return dmi;
420 
421         fallback = fallback_chassis();
422         if (fallback)
423                 return strdup(fallback);
424 
425         return NULL;
426 }
427 
context_fallback_icon_name(Context * c)428 static char* context_fallback_icon_name(Context *c) {
429         _cleanup_free_ char *chassis = NULL;
430 
431         assert(c);
432 
433         chassis = context_get_chassis(c);
434         if (chassis)
435                 return strjoin("computer-", chassis);
436 
437         return strdup("computer");
438 }
439 
context_update_kernel_hostname(Context * c,const char * transient_hn)440 static int context_update_kernel_hostname(
441                 Context *c,
442                 const char *transient_hn) {
443 
444         _cleanup_free_ char *_hn_free = NULL;
445         const char *hn;
446         HostnameSource hns;
447         int r;
448 
449         assert(c);
450 
451         /* /etc/hostname has the highest preference ... */
452         if (c->data[PROP_STATIC_HOSTNAME]) {
453                 hn = c->data[PROP_STATIC_HOSTNAME];
454                 hns = HOSTNAME_STATIC;
455 
456         /* ... the transient hostname, (ie: DHCP) comes next ... */
457         } else if (transient_hn) {
458                 hn = transient_hn;
459                 hns = HOSTNAME_TRANSIENT;
460 
461         /* ... and the ultimate fallback */
462         } else {
463                 hn = _hn_free = get_default_hostname();
464                 if (!hn)
465                         return log_oom();
466 
467                 hns = HOSTNAME_DEFAULT;
468         }
469 
470         r = sethostname_idempotent(hn);
471         if (r < 0)
472                 return log_error_errno(r, "Failed to set hostname: %m");
473 
474         if (c->hostname_source != hns) {
475                 c->hostname_source = hns;
476                 r = 1;
477         }
478 
479         (void) nscd_flush_cache(STRV_MAKE("hosts"));
480 
481         if (r == 0)
482                 log_debug("Hostname was already set to <%s>.", hn);
483         else {
484                 log_info("Hostname set to <%s> (%s)", hn, hostname_source_to_string(hns));
485 
486                 hostname_update_source_hint(hn, hns);
487         }
488 
489         return r; /* 0 if no change, 1 if something was done  */
490 }
491 
unset_statp(struct stat ** p)492 static void unset_statp(struct stat **p) {
493         if (!*p)
494                 return;
495 
496         **p = (struct stat) {};
497 }
498 
context_write_data_static_hostname(Context * c)499 static int context_write_data_static_hostname(Context *c) {
500         _cleanup_(unset_statp) struct stat *s = NULL;
501         int r;
502 
503         assert(c);
504 
505         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
506          * already, even if we can't make it hit the disk. */
507         s = &c->etc_hostname_stat;
508 
509         if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
510                 if (unlink("/etc/hostname") < 0 && errno != ENOENT)
511                         return -errno;
512 
513                 TAKE_PTR(s);
514                 return 0;
515         }
516 
517         r = write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
518         if (r < 0)
519                 return r;
520 
521         TAKE_PTR(s);
522         return 0;
523 }
524 
context_write_data_machine_info(Context * c)525 static int context_write_data_machine_info(Context *c) {
526         _cleanup_(unset_statp) struct stat *s = NULL;
527         static const char * const name[_PROP_MAX] = {
528                 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
529                 [PROP_ICON_NAME] = "ICON_NAME",
530                 [PROP_CHASSIS] = "CHASSIS",
531                 [PROP_DEPLOYMENT] = "DEPLOYMENT",
532                 [PROP_LOCATION] = "LOCATION",
533         };
534         _cleanup_strv_free_ char **l = NULL;
535         int r;
536 
537         assert(c);
538 
539         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
540          * already, even if we can't make it hit the disk. */
541         s = &c->etc_machine_info_stat;
542 
543         r = load_env_file(NULL, "/etc/machine-info", &l);
544         if (r < 0 && r != -ENOENT)
545                 return r;
546 
547         for (int p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
548                 assert(name[p]);
549 
550                 r = strv_env_assign(&l, name[p], empty_to_null(c->data[p]));
551                 if (r < 0)
552                         return r;
553         }
554 
555         if (strv_isempty(l)) {
556                 if (unlink("/etc/machine-info") < 0 && errno != ENOENT)
557                         return -errno;
558 
559                 TAKE_PTR(s);
560                 return 0;
561         }
562 
563         r = write_env_file_label("/etc/machine-info", l);
564         if (r < 0)
565                 return r;
566 
567         TAKE_PTR(s);
568         return 0;
569 }
570 
property_get_hardware_property(sd_bus_message * reply,Context * c,HostProperty prop,int (* getter)(char **))571 static int property_get_hardware_property(
572                 sd_bus_message *reply,
573                 Context *c,
574                 HostProperty prop,
575                 int (*getter)(char **)) {
576 
577         _cleanup_free_ char *from_dmi = NULL;
578 
579         assert(reply);
580         assert(c);
581         assert(IN_SET(prop, PROP_HARDWARE_VENDOR, PROP_HARDWARE_MODEL));
582         assert(getter);
583 
584         context_read_machine_info(c);
585 
586         if (isempty(c->data[prop]))
587                 (void) getter(&from_dmi);
588 
589         return sd_bus_message_append(reply, "s", from_dmi ?: c->data[prop]);
590 }
591 
property_get_hardware_vendor(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)592 static int property_get_hardware_vendor(
593                 sd_bus *bus,
594                 const char *path,
595                 const char *interface,
596                 const char *property,
597                 sd_bus_message *reply,
598                 void *userdata,
599                 sd_bus_error *error) {
600 
601         return property_get_hardware_property(reply, userdata, PROP_HARDWARE_VENDOR, get_hardware_vendor);
602 }
603 
property_get_hardware_model(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)604 static int property_get_hardware_model(
605                 sd_bus *bus,
606                 const char *path,
607                 const char *interface,
608                 const char *property,
609                 sd_bus_message *reply,
610                 void *userdata,
611                 sd_bus_error *error) {
612 
613         return property_get_hardware_property(reply, userdata, PROP_HARDWARE_MODEL, get_hardware_model);
614 }
615 
property_get_firmware_version(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)616 static int property_get_firmware_version(
617                 sd_bus *bus,
618                 const char *path,
619                 const char *interface,
620                 const char *property,
621                 sd_bus_message *reply,
622                 void *userdata,
623                 sd_bus_error *error) {
624 
625         _cleanup_free_ char *firmware_version = NULL;
626 
627         (void) get_firmware_version(&firmware_version);
628 
629         return sd_bus_message_append(reply, "s", firmware_version);
630 }
631 
property_get_hostname(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)632 static int property_get_hostname(
633                 sd_bus *bus,
634                 const char *path,
635                 const char *interface,
636                 const char *property,
637                 sd_bus_message *reply,
638                 void *userdata,
639                 sd_bus_error *error) {
640 
641         _cleanup_free_ char *hn = NULL;
642         int r;
643 
644         r = gethostname_strict(&hn);
645         if (r < 0) {
646                 if (r != -ENXIO)
647                         return r;
648 
649                 hn = get_default_hostname();
650                 if (!hn)
651                         return -ENOMEM;
652         }
653 
654         return sd_bus_message_append(reply, "s", hn);
655 }
656 
property_get_static_hostname(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)657 static int property_get_static_hostname(
658                 sd_bus *bus,
659                 const char *path,
660                 const char *interface,
661                 const char *property,
662                 sd_bus_message *reply,
663                 void *userdata,
664                 sd_bus_error *error) {
665 
666         Context *c = userdata;
667         assert(c);
668 
669         context_read_etc_hostname(c);
670 
671         return sd_bus_message_append(reply, "s", c->data[PROP_STATIC_HOSTNAME]);
672 }
673 
property_get_default_hostname(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)674 static int property_get_default_hostname(
675                 sd_bus *bus,
676                 const char *path,
677                 const char *interface,
678                 const char *property,
679                 sd_bus_message *reply,
680                 void *userdata,
681                 sd_bus_error *error) {
682 
683         _cleanup_free_ char *hn = NULL;
684 
685         hn = get_default_hostname();
686         if (!hn)
687                 return log_oom();
688 
689         return sd_bus_message_append(reply, "s", hn);
690 }
691 
context_determine_hostname_source(Context * c)692 static void context_determine_hostname_source(Context *c) {
693         _cleanup_free_ char *hostname = NULL;
694         int r;
695 
696         assert(c);
697 
698         if (c->hostname_source >= 0)
699                 return;
700 
701         (void) gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hostname);
702 
703         if (streq_ptr(hostname, c->data[PROP_STATIC_HOSTNAME]))
704                 c->hostname_source = HOSTNAME_STATIC;
705         else {
706                 _cleanup_free_ char *fallback = NULL;
707 
708                 /* If the hostname was not set by us, try to figure out where it came from. If we set it to
709                  * the default hostname, the file will tell us. We compare the string because it is possible
710                  * that the hostname was set by an older version that had a different fallback, in the
711                  * initramfs or before we reexecuted. */
712 
713                 r = read_one_line_file("/run/systemd/default-hostname", &fallback);
714                 if (r < 0 && r != -ENOENT)
715                         log_warning_errno(r, "Failed to read /run/systemd/default-hostname, ignoring: %m");
716 
717                 if (streq_ptr(fallback, hostname))
718                         c->hostname_source = HOSTNAME_DEFAULT;
719                 else
720                         c->hostname_source = HOSTNAME_TRANSIENT;
721         }
722 }
723 
property_get_hostname_source(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)724 static int property_get_hostname_source(
725                 sd_bus *bus,
726                 const char *path,
727                 const char *interface,
728                 const char *property,
729                 sd_bus_message *reply,
730                 void *userdata,
731                 sd_bus_error *error) {
732 
733         Context *c = userdata;
734         assert(c);
735 
736         context_read_etc_hostname(c);
737         context_determine_hostname_source(c);
738 
739         return sd_bus_message_append(reply, "s", hostname_source_to_string(c->hostname_source));
740 }
741 
property_get_machine_info_field(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)742 static int property_get_machine_info_field(
743                 sd_bus *bus,
744                 const char *path,
745                 const char *interface,
746                 const char *property,
747                 sd_bus_message *reply,
748                 void *userdata,
749                 sd_bus_error *error) {
750 
751         sd_bus_slot *slot;
752         Context *c;
753 
754         /* Acquire the context object without this property's userdata offset added. Explanation: we want
755          * access to two pointers here: a) the main context object we cache all properties in, and b) the
756          * pointer to the property field inside the context object that we are supposed to update and
757          * use. The latter (b) we get in the 'userdata' function parameter, and sd-bus calculates that for us
758          * from the 'userdata' pointer we supplied when the vtable was registered, with the offset we
759          * specified in the vtable added on top. To get the former (a) we need the 'userdata' pointer from
760          * the vtable registration directly, without the offset added. Hence we ask sd-bus what the slot
761          * object is (which encapsulates the vtable registration), and then query the 'userdata' field
762          * directly off it. */
763         assert_se(slot = sd_bus_get_current_slot(bus));
764         assert_se(c = sd_bus_slot_get_userdata(slot));
765 
766         context_read_machine_info(c);
767 
768         return sd_bus_message_append(reply, "s", *(char**) userdata);
769 }
770 
property_get_os_release_field(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)771 static int property_get_os_release_field(
772                 sd_bus *bus,
773                 const char *path,
774                 const char *interface,
775                 const char *property,
776                 sd_bus_message *reply,
777                 void *userdata,
778                 sd_bus_error *error) {
779 
780         sd_bus_slot *slot;
781         Context *c;
782 
783         /* As above, acquire the current context without this property's userdata offset added. */
784         assert_se(slot = sd_bus_get_current_slot(bus));
785         assert_se(c = sd_bus_slot_get_userdata(slot));
786 
787         context_read_os_release(c);
788 
789         return sd_bus_message_append(reply, "s", *(char**) userdata);
790 }
791 
property_get_icon_name(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)792 static int property_get_icon_name(
793                 sd_bus *bus,
794                 const char *path,
795                 const char *interface,
796                 const char *property,
797                 sd_bus_message *reply,
798                 void *userdata,
799                 sd_bus_error *error) {
800 
801         _cleanup_free_ char *n = NULL;
802         Context *c = userdata;
803         const char *name;
804 
805         context_read_machine_info(c);
806 
807         if (isempty(c->data[PROP_ICON_NAME]))
808                 name = n = context_fallback_icon_name(c);
809         else
810                 name = c->data[PROP_ICON_NAME];
811 
812         if (!name)
813                 return -ENOMEM;
814 
815         return sd_bus_message_append(reply, "s", name);
816 }
817 
property_get_chassis(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)818 static int property_get_chassis(
819                 sd_bus *bus,
820                 const char *path,
821                 const char *interface,
822                 const char *property,
823                 sd_bus_message *reply,
824                 void *userdata,
825                 sd_bus_error *error) {
826 
827         _cleanup_free_ char *chassis = NULL;
828         Context *c = userdata;
829 
830         context_read_machine_info(c);
831 
832         chassis = context_get_chassis(c);
833 
834         return sd_bus_message_append(reply, "s", chassis);
835 }
836 
property_get_uname_field(sd_bus * bus,const char * path,const char * interface,const char * property,sd_bus_message * reply,void * userdata,sd_bus_error * error)837 static int property_get_uname_field(
838                 sd_bus *bus,
839                 const char *path,
840                 const char *interface,
841                 const char *property,
842                 sd_bus_message *reply,
843                 void *userdata,
844                 sd_bus_error *error) {
845 
846         struct utsname u;
847 
848         assert_se(uname(&u) >= 0);
849 
850         return sd_bus_message_append(reply, "s", (char*) &u + PTR_TO_SIZE(userdata));
851 }
852 
method_set_hostname(sd_bus_message * m,void * userdata,sd_bus_error * error)853 static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
854         Context *c = userdata;
855         const char *name;
856         int interactive, r;
857 
858         assert(m);
859         assert(c);
860 
861         r = sd_bus_message_read(m, "sb", &name, &interactive);
862         if (r < 0)
863                 return r;
864 
865         name = empty_to_null(name);
866 
867         /* We always go through with the procedure below without comparing to the current hostname, because
868          * we might want to adjust hostname source information even if the actual hostname is unchanged. */
869 
870         if (name && !hostname_is_valid(name, 0))
871                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
872 
873         context_read_etc_hostname(c);
874 
875         r = bus_verify_polkit_async(
876                         m,
877                         CAP_SYS_ADMIN,
878                         "org.freedesktop.hostname1.set-hostname",
879                         NULL,
880                         interactive,
881                         UID_INVALID,
882                         &c->polkit_registry,
883                         error);
884         if (r < 0)
885                 return r;
886         if (r == 0)
887                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
888 
889         r = context_update_kernel_hostname(c, name);
890         if (r < 0)
891                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
892         else if (r > 0)
893                 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
894                                                       "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
895                                                       "Hostname", "HostnameSource", NULL);
896 
897         return sd_bus_reply_method_return(m, NULL);
898 }
899 
method_set_static_hostname(sd_bus_message * m,void * userdata,sd_bus_error * error)900 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
901         Context *c = userdata;
902         const char *name;
903         int interactive;
904         int r;
905 
906         assert(m);
907         assert(c);
908 
909         r = sd_bus_message_read(m, "sb", &name, &interactive);
910         if (r < 0)
911                 return r;
912 
913         name = empty_to_null(name);
914 
915         context_read_etc_hostname(c);
916 
917         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
918                 return sd_bus_reply_method_return(m, NULL);
919 
920         if (name && !hostname_is_valid(name, 0))
921                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
922 
923         r = bus_verify_polkit_async(
924                         m,
925                         CAP_SYS_ADMIN,
926                         "org.freedesktop.hostname1.set-static-hostname",
927                         NULL,
928                         interactive,
929                         UID_INVALID,
930                         &c->polkit_registry,
931                         error);
932         if (r < 0)
933                 return r;
934         if (r == 0)
935                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
936 
937         r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name);
938         if (r < 0)
939                 return r;
940 
941         r = context_write_data_static_hostname(c);
942         if (r < 0) {
943                 log_error_errno(r, "Failed to write static hostname: %m");
944                 if (ERRNO_IS_PRIVILEGE(r))
945                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/hostname.");
946                 if (r == -EROFS)
947                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/hostname is in a read-only filesystem.");
948                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
949         }
950 
951         r = context_update_kernel_hostname(c, NULL);
952         if (r < 0) {
953                 log_error_errno(r, "Failed to set hostname: %m");
954                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
955         }
956 
957         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
958                                               "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
959                                               "StaticHostname", "Hostname", "HostnameSource", NULL);
960 
961         return sd_bus_reply_method_return(m, NULL);
962 }
963 
set_machine_info(Context * c,sd_bus_message * m,int prop,sd_bus_message_handler_t cb,sd_bus_error * error)964 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
965         int interactive;
966         const char *name;
967         int r;
968 
969         assert(c);
970         assert(m);
971 
972         r = sd_bus_message_read(m, "sb", &name, &interactive);
973         if (r < 0)
974                 return r;
975 
976         name = empty_to_null(name);
977 
978         context_read_machine_info(c);
979 
980         if (streq_ptr(name, c->data[prop]))
981                 return sd_bus_reply_method_return(m, NULL);
982 
983         if (!isempty(name)) {
984                 /* The icon name might ultimately be used as file
985                  * name, so better be safe than sorry */
986 
987                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
988                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
989                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
990                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty hostname '%s'", name);
991                 if (prop == PROP_CHASSIS && !valid_chassis(name))
992                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
993                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
994                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
995                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
996                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
997         }
998 
999         /* Since the pretty hostname should always be changed at the
1000          * same time as the static one, use the same policy action for
1001          * both... */
1002 
1003         r = bus_verify_polkit_async(
1004                         m,
1005                         CAP_SYS_ADMIN,
1006                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
1007                         NULL,
1008                         interactive,
1009                         UID_INVALID,
1010                         &c->polkit_registry,
1011                         error);
1012         if (r < 0)
1013                 return r;
1014         if (r == 0)
1015                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1016 
1017         r = free_and_strdup_warn(&c->data[prop], name);
1018         if (r < 0)
1019                 return r;
1020 
1021         r = context_write_data_machine_info(c);
1022         if (r < 0) {
1023                 log_error_errno(r, "Failed to write machine info: %m");
1024                 if (ERRNO_IS_PRIVILEGE(r))
1025                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/machine-info.");
1026                 if (r == -EROFS)
1027                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/machine-info is in a read-only filesystem.");
1028                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
1029         }
1030 
1031         log_info("Changed %s to '%s'",
1032                  prop == PROP_PRETTY_HOSTNAME ? "pretty hostname" :
1033                  prop == PROP_DEPLOYMENT ? "deployment" :
1034                  prop == PROP_LOCATION ? "location" :
1035                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
1036 
1037         (void) sd_bus_emit_properties_changed(
1038                         sd_bus_message_get_bus(m),
1039                         "/org/freedesktop/hostname1",
1040                         "org.freedesktop.hostname1",
1041                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
1042                         prop == PROP_DEPLOYMENT ? "Deployment" :
1043                         prop == PROP_LOCATION ? "Location" :
1044                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
1045 
1046         return sd_bus_reply_method_return(m, NULL);
1047 }
1048 
method_set_pretty_hostname(sd_bus_message * m,void * userdata,sd_bus_error * error)1049 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1050         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
1051 }
1052 
method_set_icon_name(sd_bus_message * m,void * userdata,sd_bus_error * error)1053 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1054         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
1055 }
1056 
method_set_chassis(sd_bus_message * m,void * userdata,sd_bus_error * error)1057 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1058         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
1059 }
1060 
method_set_deployment(sd_bus_message * m,void * userdata,sd_bus_error * error)1061 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1062         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
1063 }
1064 
method_set_location(sd_bus_message * m,void * userdata,sd_bus_error * error)1065 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1066         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
1067 }
1068 
method_get_product_uuid(sd_bus_message * m,void * userdata,sd_bus_error * error)1069 static int method_get_product_uuid(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1070         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1071         Context *c = userdata;
1072         int interactive, r;
1073         sd_id128_t uuid;
1074 
1075         assert(m);
1076         assert(c);
1077 
1078         r = sd_bus_message_read(m, "b", &interactive);
1079         if (r < 0)
1080                 return r;
1081 
1082         r = bus_verify_polkit_async(
1083                         m,
1084                         CAP_SYS_ADMIN,
1085                         "org.freedesktop.hostname1.get-product-uuid",
1086                         NULL,
1087                         interactive,
1088                         UID_INVALID,
1089                         &c->polkit_registry,
1090                         error);
1091         if (r < 0)
1092                 return r;
1093         if (r == 0)
1094                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1095 
1096         r = id128_get_product(&uuid);
1097         if (r < 0) {
1098                 if (r == -EADDRNOTAVAIL)
1099                         log_debug_errno(r, "DMI product UUID is all 0x00 or all 0xFF, ignoring.");
1100                 else
1101                         log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1102                                        "Failed to read product UUID, ignoring: %m");
1103 
1104                 return sd_bus_error_set(error, BUS_ERROR_NO_PRODUCT_UUID,
1105                                         "Failed to read product UUID from firmware.");
1106         }
1107 
1108         r = sd_bus_message_new_method_return(m, &reply);
1109         if (r < 0)
1110                 return r;
1111 
1112         r = sd_bus_message_append_array(reply, 'y', uuid.bytes, sizeof(uuid.bytes));
1113         if (r < 0)
1114                 return r;
1115 
1116         return sd_bus_send(NULL, reply, NULL);
1117 }
1118 
method_get_hardware_serial(sd_bus_message * m,void * userdata,sd_bus_error * error)1119 static int method_get_hardware_serial(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1120         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1121         _cleanup_free_ char *serial = NULL;
1122         Context *c = userdata;
1123         int r;
1124 
1125         assert(m);
1126         assert(c);
1127 
1128         r = bus_verify_polkit_async(
1129                         m,
1130                         CAP_SYS_ADMIN,
1131                         "org.freedesktop.hostname1.get-hardware-serial",
1132                         NULL,
1133                         false,
1134                         UID_INVALID,
1135                         &c->polkit_registry,
1136                         error);
1137         if (r < 0)
1138                 return r;
1139         if (r == 0)
1140                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1141 
1142         r = get_hardware_serial(&serial);
1143         if (r < 0)
1144                 return r;
1145 
1146         r = sd_bus_message_new_method_return(m, &reply);
1147         if (r < 0)
1148                 return r;
1149 
1150         r = sd_bus_message_append(reply, "s", serial);
1151         if (r < 0)
1152                 return r;
1153 
1154         return sd_bus_send(NULL, reply, NULL);
1155 }
1156 
method_describe(sd_bus_message * m,void * userdata,sd_bus_error * error)1157 static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1158         _cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL, *text = NULL,
1159                 *chassis = NULL, *vendor = NULL, *model = NULL, *serial = NULL, *firmware_version = NULL;
1160         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1161         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
1162         sd_id128_t product_uuid = SD_ID128_NULL;
1163         Context *c = userdata;
1164         bool privileged;
1165         struct utsname u;
1166         int r;
1167 
1168         assert(m);
1169         assert(c);
1170 
1171         r = bus_verify_polkit_async(
1172                         m,
1173                         CAP_SYS_ADMIN,
1174                         "org.freedesktop.hostname1.get-description",
1175                         NULL,
1176                         false,
1177                         UID_INVALID,
1178                         &c->polkit_registry,
1179                         NULL);
1180         if (r == 0)
1181                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1182 
1183         /* We ignore all authentication errors here, since most data is unprivileged, the one exception being
1184          * the product ID which we'll check explicitly. */
1185         privileged = r > 0;
1186 
1187         context_read_etc_hostname(c);
1188         context_read_machine_info(c);
1189         context_read_os_release(c);
1190         context_determine_hostname_source(c);
1191 
1192         r = gethostname_strict(&hn);
1193         if (r < 0) {
1194                 if (r != -ENXIO)
1195                         return log_error_errno(r, "Failed to read local host name: %m");
1196 
1197                 hn = get_default_hostname();
1198                 if (!hn)
1199                         return log_oom();
1200         }
1201 
1202         dhn = get_default_hostname();
1203         if (!dhn)
1204                 return log_oom();
1205 
1206         if (isempty(c->data[PROP_ICON_NAME]))
1207                 in = context_fallback_icon_name(c);
1208 
1209         chassis = context_get_chassis(c);
1210 
1211         assert_se(uname(&u) >= 0);
1212 
1213         if (isempty(c->data[PROP_HARDWARE_VENDOR]))
1214                 (void) get_hardware_vendor(&vendor);
1215         if (isempty(c->data[PROP_HARDWARE_MODEL]))
1216                 (void) get_hardware_model(&model);
1217 
1218         if (privileged) {
1219                 /* The product UUID and hardware serial is only available to privileged clients */
1220                 (void) id128_get_product(&product_uuid);
1221                 (void) get_hardware_serial(&serial);
1222         }
1223         (void) get_firmware_version(&firmware_version);
1224 
1225         r = json_build(&v, JSON_BUILD_OBJECT(
1226                                        JSON_BUILD_PAIR("Hostname", JSON_BUILD_STRING(hn)),
1227                                        JSON_BUILD_PAIR("StaticHostname", JSON_BUILD_STRING(c->data[PROP_STATIC_HOSTNAME])),
1228                                        JSON_BUILD_PAIR("PrettyHostname", JSON_BUILD_STRING(c->data[PROP_PRETTY_HOSTNAME])),
1229                                        JSON_BUILD_PAIR("DefaultHostname", JSON_BUILD_STRING(dhn)),
1230                                        JSON_BUILD_PAIR("HostnameSource", JSON_BUILD_STRING(hostname_source_to_string(c->hostname_source))),
1231                                        JSON_BUILD_PAIR("IconName", JSON_BUILD_STRING(in ?: c->data[PROP_ICON_NAME])),
1232                                        JSON_BUILD_PAIR("Chassis", JSON_BUILD_STRING(chassis)),
1233                                        JSON_BUILD_PAIR("Deployment", JSON_BUILD_STRING(c->data[PROP_DEPLOYMENT])),
1234                                        JSON_BUILD_PAIR("Location", JSON_BUILD_STRING(c->data[PROP_LOCATION])),
1235                                        JSON_BUILD_PAIR("KernelName", JSON_BUILD_STRING(u.sysname)),
1236                                        JSON_BUILD_PAIR("KernelRelease", JSON_BUILD_STRING(u.release)),
1237                                        JSON_BUILD_PAIR("KernelVersion", JSON_BUILD_STRING(u.version)),
1238                                        JSON_BUILD_PAIR("OperatingSystemPrettyName", JSON_BUILD_STRING(c->data[PROP_OS_PRETTY_NAME])),
1239                                        JSON_BUILD_PAIR("OperatingSystemCPEName", JSON_BUILD_STRING(c->data[PROP_OS_CPE_NAME])),
1240                                        JSON_BUILD_PAIR("OperatingSystemHomeURL", JSON_BUILD_STRING(c->data[PROP_OS_HOME_URL])),
1241                                        JSON_BUILD_PAIR("HardwareVendor", JSON_BUILD_STRING(vendor ?: c->data[PROP_HARDWARE_VENDOR])),
1242                                        JSON_BUILD_PAIR("HardwareModel", JSON_BUILD_STRING(model ?: c->data[PROP_HARDWARE_MODEL])),
1243                                        JSON_BUILD_PAIR("HardwareSerial", JSON_BUILD_STRING(serial)),
1244                                        JSON_BUILD_PAIR("FirmwareVersion", JSON_BUILD_STRING(firmware_version)),
1245                                        JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_ID128(product_uuid)),
1246                                        JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_NULL)));
1247 
1248         if (r < 0)
1249                 return log_error_errno(r, "Failed to build JSON data: %m");
1250 
1251         r = json_variant_format(v, 0, &text);
1252         if (r < 0)
1253                 return log_error_errno(r, "Failed to format JSON data: %m");
1254 
1255         r = sd_bus_message_new_method_return(m, &reply);
1256         if (r < 0)
1257                 return r;
1258 
1259         r = sd_bus_message_append(reply, "s", text);
1260         if (r < 0)
1261                 return r;
1262 
1263         return sd_bus_send(NULL, reply, NULL);
1264 }
1265 
1266 static const sd_bus_vtable hostname_vtable[] = {
1267         SD_BUS_VTABLE_START(0),
1268         SD_BUS_PROPERTY("Hostname", "s", property_get_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1269         SD_BUS_PROPERTY("StaticHostname", "s", property_get_static_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1270         SD_BUS_PROPERTY("PrettyHostname", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1271         SD_BUS_PROPERTY("DefaultHostname", "s", property_get_default_hostname, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1272         SD_BUS_PROPERTY("HostnameSource", "s", property_get_hostname_source, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1273         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1274         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1275         SD_BUS_PROPERTY("Deployment", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1276         SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1277         SD_BUS_PROPERTY("KernelName", "s", property_get_uname_field, offsetof(struct utsname, sysname), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1278         SD_BUS_PROPERTY("KernelRelease", "s", property_get_uname_field, offsetof(struct utsname, release), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1279         SD_BUS_PROPERTY("KernelVersion", "s", property_get_uname_field, offsetof(struct utsname, version), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1280         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1281         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1282         SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_HOME_URL, SD_BUS_VTABLE_PROPERTY_CONST),
1283         SD_BUS_PROPERTY("HardwareVendor", "s", property_get_hardware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1284         SD_BUS_PROPERTY("HardwareModel", "s", property_get_hardware_model, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1285         SD_BUS_PROPERTY("FirmwareVersion", "s", property_get_firmware_version, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1286 
1287         SD_BUS_METHOD_WITH_ARGS("SetHostname",
1288                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1289                                 SD_BUS_NO_RESULT,
1290                                 method_set_hostname,
1291                                 SD_BUS_VTABLE_UNPRIVILEGED),
1292         SD_BUS_METHOD_WITH_ARGS("SetStaticHostname",
1293                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1294                                 SD_BUS_NO_RESULT,
1295                                 method_set_static_hostname,
1296                                 SD_BUS_VTABLE_UNPRIVILEGED),
1297         SD_BUS_METHOD_WITH_ARGS("SetPrettyHostname",
1298                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1299                                 SD_BUS_NO_RESULT,
1300                                 method_set_pretty_hostname,
1301                                 SD_BUS_VTABLE_UNPRIVILEGED),
1302         SD_BUS_METHOD_WITH_ARGS("SetIconName",
1303                                 SD_BUS_ARGS("s", icon, "b", interactive),
1304                                 SD_BUS_NO_RESULT,
1305                                 method_set_icon_name,
1306                                 SD_BUS_VTABLE_UNPRIVILEGED),
1307         SD_BUS_METHOD_WITH_ARGS("SetChassis",
1308                                 SD_BUS_ARGS("s", chassis, "b", interactive),
1309                                 SD_BUS_NO_RESULT,
1310                                 method_set_chassis,
1311                                 SD_BUS_VTABLE_UNPRIVILEGED),
1312         SD_BUS_METHOD_WITH_ARGS("SetDeployment",
1313                                 SD_BUS_ARGS("s", deployment, "b", interactive),
1314                                 SD_BUS_NO_RESULT,
1315                                 method_set_deployment,
1316                                 SD_BUS_VTABLE_UNPRIVILEGED),
1317         SD_BUS_METHOD_WITH_ARGS("SetLocation",
1318                                 SD_BUS_ARGS("s", location, "b", interactive),
1319                                 SD_BUS_NO_RESULT,
1320                                 method_set_location,
1321                                 SD_BUS_VTABLE_UNPRIVILEGED),
1322         SD_BUS_METHOD_WITH_ARGS("GetProductUUID",
1323                                 SD_BUS_ARGS("b", interactive),
1324                                 SD_BUS_RESULT("ay", uuid),
1325                                 method_get_product_uuid,
1326                                 SD_BUS_VTABLE_UNPRIVILEGED),
1327         SD_BUS_METHOD_WITH_ARGS("GetHardwareSerial",
1328                                 SD_BUS_NO_ARGS,
1329                                 SD_BUS_RESULT("s", serial),
1330                                 method_get_hardware_serial,
1331                                 SD_BUS_VTABLE_UNPRIVILEGED),
1332         SD_BUS_METHOD_WITH_ARGS("Describe",
1333                                 SD_BUS_NO_ARGS,
1334                                 SD_BUS_RESULT("s", json),
1335                                 method_describe,
1336                                 SD_BUS_VTABLE_UNPRIVILEGED),
1337 
1338         SD_BUS_VTABLE_END,
1339 };
1340 
1341 static const BusObjectImplementation manager_object = {
1342         "/org/freedesktop/hostname1",
1343         "org.freedesktop.hostname1",
1344         .vtables = BUS_VTABLES(hostname_vtable),
1345 };
1346 
connect_bus(Context * c,sd_event * event,sd_bus ** ret)1347 static int connect_bus(Context *c, sd_event *event, sd_bus **ret) {
1348         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1349         int r;
1350 
1351         assert(c);
1352         assert(event);
1353         assert(ret);
1354 
1355         r = sd_bus_default_system(&bus);
1356         if (r < 0)
1357                 return log_error_errno(r, "Failed to get system bus connection: %m");
1358 
1359         r = bus_add_implementation(bus, &manager_object, c);
1360         if (r < 0)
1361                 return r;
1362 
1363         r = bus_log_control_api_register(bus);
1364         if (r < 0)
1365                 return r;
1366 
1367         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.hostname1", 0, NULL, NULL);
1368         if (r < 0)
1369                 return log_error_errno(r, "Failed to request name: %m");
1370 
1371         r = sd_bus_attach_event(bus, event, 0);
1372         if (r < 0)
1373                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
1374 
1375         *ret = TAKE_PTR(bus);
1376         return 0;
1377 }
1378 
run(int argc,char * argv[])1379 static int run(int argc, char *argv[]) {
1380         _cleanup_(context_destroy) Context context = {
1381                 .hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */
1382         };
1383         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
1384         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1385         int r;
1386 
1387         log_setup();
1388 
1389         r = service_parse_argv("systemd-hostnamed.service",
1390                                "Manage the system hostname and related metadata.",
1391                                BUS_IMPLEMENTATIONS(&manager_object,
1392                                                    &log_control_object),
1393                                argc, argv);
1394         if (r <= 0)
1395                 return r;
1396 
1397         umask(0022);
1398 
1399         r = mac_selinux_init();
1400         if (r < 0)
1401                 return r;
1402 
1403         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
1404 
1405         r = sd_event_default(&event);
1406         if (r < 0)
1407                 return log_error_errno(r, "Failed to allocate event loop: %m");
1408 
1409         (void) sd_event_set_watchdog(event, true);
1410 
1411         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
1412         if (r < 0)
1413                 return log_error_errno(r, "Failed to install SIGINT handler: %m");
1414 
1415         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
1416         if (r < 0)
1417                 return log_error_errno(r, "Failed to install SIGTERM handler: %m");
1418 
1419         r = connect_bus(&context, event, &bus);
1420         if (r < 0)
1421                 return r;
1422 
1423         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
1424         if (r < 0)
1425                 return log_error_errno(r, "Failed to run event loop: %m");
1426 
1427         return 0;
1428 }
1429 
1430 DEFINE_MAIN_FUNCTION(run);
1431