src/resolve/resolved-dnssd-bus.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "alloc-util.h"
   4 #include "bus-polkit.h"
   5 #include "missing_capability.h"
   6 #include "resolved-dnssd-bus.h"
   7 #include "resolved-dnssd.h"
   8 #include "resolved-link.h"
   9 #include "resolved-manager.h"
  10 #include "strv.h"
  11 #include "user-util.h"
  12
  13 int bus_dnssd_method_unregister(sd_bus_message *message, void *userdata, sd_bus_error *error) {
  14         DnssdService *s = userdata;
  15         DnssdTxtData *txt_data;
  16         Manager *m;
  17         Iterator i;
  18         Link *l;
  19         int r;
  20
  21         assert(message);
  22         assert(s);
  23
  24         m = s->manager;
  25
  26         r = bus_verify_polkit_async(message, CAP_SYS_ADMIN,
  27                                     "org.freedesktop.resolve1.unregister-service",
  28                                     NULL, false, s->originator,
  29                                     &m->polkit_registry, error);
  30         if (r < 0)
  31                 return r;
  32         if (r == 0)
  33                 return 1; /* Polkit will call us back */
  34
  35         HASHMAP_FOREACH(l, m->links, i) {
  36                 if (l->mdns_ipv4_scope) {
  37                         r = dns_scope_announce(l->mdns_ipv4_scope, true);
  38                         if (r < 0)
  39                                 log_warning_errno(r, "Failed to send goodbye messages in IPv4 scope: %m");
  40
  41                         dns_zone_remove_rr(&l->mdns_ipv4_scope->zone, s->ptr_rr);
  42                         dns_zone_remove_rr(&l->mdns_ipv4_scope->zone, s->srv_rr);
  43                         LIST_FOREACH(items, txt_data, s->txt_data_items)
  44                                 dns_zone_remove_rr(&l->mdns_ipv4_scope->zone, txt_data->rr);
  45                 }
  46
  47                 if (l->mdns_ipv6_scope) {
  48                         r = dns_scope_announce(l->mdns_ipv6_scope, true);
  49                         if (r < 0)
  50                                 log_warning_errno(r, "Failed to send goodbye messages in IPv6 scope: %m");
  51
  52                         dns_zone_remove_rr(&l->mdns_ipv6_scope->zone, s->ptr_rr);
  53                         dns_zone_remove_rr(&l->mdns_ipv6_scope->zone, s->srv_rr);
  54                         LIST_FOREACH(items, txt_data, s->txt_data_items)
  55                                 dns_zone_remove_rr(&l->mdns_ipv6_scope->zone, txt_data->rr);
  56                 }
  57         }
  58
  59         dnssd_service_free(s);
  60
  61         manager_refresh_rrs(m);
  62
  63         return sd_bus_reply_method_return(message, NULL);
  64 }
  65
  66 static int dnssd_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
  67         _cleanup_free_ char *name = NULL;
  68         Manager *m = userdata;
  69         DnssdService *service;
  70         int r;
  71
  72         assert(bus);
  73         assert(path);
  74         assert(interface);
  75         assert(found);
  76         assert(m);
  77
  78         r = sd_bus_path_decode(path, "/org/freedesktop/resolve1/dnssd", &name);
  79         if (r <= 0)
  80                 return 0;
  81
  82         service = hashmap_get(m->dnssd_services, name);
  83         if (!service)
  84                 return 0;
  85
  86         *found = service;
  87         return 1;
  88 }
  89
  90 static int dnssd_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
  91         _cleanup_strv_free_ char **l = NULL;
  92         Manager *m = userdata;
  93         DnssdService *service;
  94         Iterator i;
  95         unsigned c = 0;
  96         int r;
  97
  98         assert(bus);
  99         assert(path);
 100         assert(m);
 101         assert(nodes);
 102
 103         l = new0(char*, hashmap_size(m->dnssd_services) + 1);
 104         if (!l)
 105                 return -ENOMEM;
 106
 107         HASHMAP_FOREACH(service, m->dnssd_services, i) {
 108                 char *p;
 109
 110                 r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", service->name, &p);
 111                 if (r < 0)
 112                         return r;
 113
 114                 l[c++] = p;
 115         }
 116
 117         l[c] = NULL;
 118         *nodes = TAKE_PTR(l);
 119
 120         return 1;
 121 }
 122
 123 static const sd_bus_vtable dnssd_vtable[] = {
 124         SD_BUS_VTABLE_START(0),
 125
 126         SD_BUS_METHOD("Unregister", NULL, NULL, bus_dnssd_method_unregister, SD_BUS_VTABLE_UNPRIVILEGED),
 127         SD_BUS_SIGNAL("Conflicted", NULL, 0),
 128
 129         SD_BUS_VTABLE_END
 130 };
 131
 132 const BusObjectImplementation dnssd_object = {
 133         "/org/freedesktop/resolve1/dnssd",
 134         "org.freedesktop.resolve1.DnssdService",
 135         .fallback_vtables = BUS_FALLBACK_VTABLES({dnssd_vtable, dnssd_object_find}),
 136         .node_enumerator = dnssd_node_enumerator,
 137 };