src/machine/machined-core.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "machined.h"
   4 #include "nscd-flush.h"
   5 #include "strv.h"
   6 #include "user-util.h"
   7
   8 static int on_nscd_cache_flush_event(sd_event_source *s, void *userdata) {
   9         /* Let's ask glibc's nscd daemon to flush its caches. We request this for the three database machines may show
  10          * up in: the hosts database (for resolvable machine names) and the user and group databases (for the user ns
  11          * ranges). */
  12
  13         (void) nscd_flush_cache(STRV_MAKE("passwd", "group", "hosts"));
  14         return 0;
  15 }
  16
  17 int manager_enqueue_nscd_cache_flush(Manager *m) {
  18         int r;
  19
  20         assert(m);
  21
  22         if (!m->nscd_cache_flush_event) {
  23                 r = sd_event_add_defer(m->event, &m->nscd_cache_flush_event, on_nscd_cache_flush_event, m);
  24                 if (r < 0)
  25                         return log_error_errno(r, "Failed to allocate NSCD cache flush event: %m");
  26
  27                 sd_event_source_set_description(m->nscd_cache_flush_event, "nscd-cache-flush");
  28         }
  29
  30         r = sd_event_source_set_enabled(m->nscd_cache_flush_event, SD_EVENT_ONESHOT);
  31         if (r < 0) {
  32                 m->nscd_cache_flush_event = sd_event_source_unref(m->nscd_cache_flush_event);
  33                 return log_error_errno(r, "Failed to enable NSCD cache flush event: %m");
  34         }
  35
  36         return 0;
  37 }
  38
  39 int manager_find_machine_for_uid(Manager *m, uid_t uid, Machine **ret_machine, uid_t *ret_internal_uid) {
  40         Machine *machine;
  41         int r;
  42
  43         assert(m);
  44         assert(uid_is_valid(uid));
  45
  46         /* Finds the machine for the specified host UID and returns it along with the UID translated into the
  47          * internal UID inside the machine */
  48
  49         HASHMAP_FOREACH(machine, m->machines) {
  50                 uid_t converted;
  51
  52                 r = machine_owns_uid(machine, uid, &converted);
  53                 if (r < 0)
  54                         return r;
  55                 if (r) {
  56                         if (ret_machine)
  57                                 *ret_machine = machine;
  58
  59                         if (ret_internal_uid)
  60                                 *ret_internal_uid = converted;
  61
  62                         return true;
  63                 }
  64         }
  65
  66         if (ret_machine)
  67                 *ret_machine = NULL;
  68         if (ret_internal_uid)
  69                 *ret_internal_uid = UID_INVALID;
  70
  71         return false;
  72 }
  73
  74 int manager_find_machine_for_gid(Manager *m, gid_t gid, Machine **ret_machine, gid_t *ret_internal_gid) {
  75         Machine *machine;
  76         int r;
  77
  78         assert(m);
  79         assert(gid_is_valid(gid));
  80
  81         HASHMAP_FOREACH(machine, m->machines) {
  82                 gid_t converted;
  83
  84                 r = machine_owns_gid(machine, gid, &converted);
  85                 if (r < 0)
  86                         return r;
  87                 if (r) {
  88                         if (ret_machine)
  89                                 *ret_machine = machine;
  90
  91                         if (ret_internal_gid)
  92                                 *ret_internal_gid = converted;
  93
  94                         return true;
  95                 }
  96         }
  97
  98         if (ret_machine)
  99                 *ret_machine = NULL;
 100         if (ret_internal_gid)
 101                 *ret_internal_gid = GID_INVALID;
 102
 103         return false;
 104 }