src/network/networkd-manager-bus.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <net/if.h>
   4 #include <netinet/in.h>
   5 #include <sys/capability.h>
   6
   7 #include "alloc-util.h"
   8 #include "bus-common-errors.h"
   9 #include "bus-message-util.h"
  10 #include "bus-polkit.h"
  11 #include "networkd-dhcp-server-bus.h"
  12 #include "networkd-dhcp4-bus.h"
  13 #include "networkd-dhcp6-bus.h"
  14 #include "networkd-json.h"
  15 #include "networkd-link-bus.h"
  16 #include "networkd-link.h"
  17 #include "networkd-manager-bus.h"
  18 #include "networkd-manager.h"
  19 #include "networkd-network-bus.h"
  20 #include "path-util.h"
  21 #include "strv.h"
  22 #include "user-util.h"
  23
  24 static int method_list_links(sd_bus_message *message, void *userdata, sd_bus_error *error) {
  25         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  26         Manager *manager = userdata;
  27         Link *link;
  28         int r;
  29
  30         r = sd_bus_message_new_method_return(message, &reply);
  31         if (r < 0)
  32                 return r;
  33
  34         r = sd_bus_message_open_container(reply, 'a', "(iso)");
  35         if (r < 0)
  36                 return r;
  37
  38         HASHMAP_FOREACH(link, manager->links_by_index) {
  39                 _cleanup_free_ char *path = NULL;
  40
  41                 path = link_bus_path(link);
  42                 if (!path)
  43                         return -ENOMEM;
  44
  45                 r = sd_bus_message_append(
  46                         reply, "(iso)",
  47                         link->ifindex,
  48                         link->ifname,
  49                         empty_to_root(path));
  50                 if (r < 0)
  51                         return r;
  52         }
  53
  54         r = sd_bus_message_close_container(reply);
  55         if (r < 0)
  56                 return r;
  57
  58         return sd_bus_send(NULL, reply, NULL);
  59 }
  60
  61 static int method_get_link_by_name(sd_bus_message *message, void *userdata, sd_bus_error *error) {
  62         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  63         _cleanup_free_ char *path = NULL;
  64         Manager *manager = userdata;
  65         const char *name;
  66         Link *link;
  67         int r;
  68
  69         r = sd_bus_message_read(message, "s", &name);
  70         if (r < 0)
  71                 return r;
  72
  73         if (link_get_by_name(manager, name, &link) < 0)
  74                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %s not known", name);
  75
  76         r = sd_bus_message_new_method_return(message, &reply);
  77         if (r < 0)
  78                 return r;
  79
  80         path = link_bus_path(link);
  81         if (!path)
  82                 return -ENOMEM;
  83
  84         r = sd_bus_message_append(reply, "io", link->ifindex, empty_to_root(path));
  85         if (r < 0)
  86                 return r;
  87
  88         return sd_bus_send(NULL, reply, NULL);
  89 }
  90
  91 static int method_get_link_by_index(sd_bus_message *message, void *userdata, sd_bus_error *error) {
  92         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
  93         _cleanup_free_ char *path = NULL;
  94         Manager *manager = userdata;
  95         int ifindex, r;
  96         Link *link;
  97
  98         r = bus_message_read_ifindex(message, error, &ifindex);
  99         if (r < 0)
 100                 return r;
 101
 102         r = link_get_by_index(manager, ifindex, &link);
 103         if (r < 0)
 104                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %i not known", ifindex);
 105
 106         r = sd_bus_message_new_method_return(message, &reply);
 107         if (r < 0)
 108                 return r;
 109
 110         path = link_bus_path(link);
 111         if (!path)
 112                 return -ENOMEM;
 113
 114         r = sd_bus_message_append(reply, "so", link->ifname, empty_to_root(path));
 115         if (r < 0)
 116                 return r;
 117
 118         return sd_bus_send(NULL, reply, NULL);
 119 }
 120
 121 static int call_link_method(Manager *m, sd_bus_message *message, sd_bus_message_handler_t handler, sd_bus_error *error) {
 122         int ifindex, r;
 123         Link *l;
 124
 125         assert(m);
 126         assert(message);
 127         assert(handler);
 128
 129         r = bus_message_read_ifindex(message, error, &ifindex);
 130         if (r < 0)
 131                 return r;
 132
 133         r = link_get_by_index(m, ifindex, &l);
 134         if (r < 0)
 135                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %i not known", ifindex);
 136
 137         return handler(message, l, error);
 138 }
 139
 140 static int bus_method_set_link_ntp_servers(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 141         return call_link_method(userdata, message, bus_link_method_set_ntp_servers, error);
 142 }
 143
 144 static int bus_method_set_link_dns_servers(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 145         return call_link_method(userdata, message, bus_link_method_set_dns_servers, error);
 146 }
 147
 148 static int bus_method_set_link_dns_servers_ex(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 149         return call_link_method(userdata, message, bus_link_method_set_dns_servers_ex, error);
 150 }
 151
 152 static int bus_method_set_link_domains(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 153         return call_link_method(userdata, message, bus_link_method_set_domains, error);
 154 }
 155
 156 static int bus_method_set_link_default_route(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 157         return call_link_method(userdata, message, bus_link_method_set_default_route, error);
 158 }
 159
 160 static int bus_method_set_link_llmnr(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 161         return call_link_method(userdata, message, bus_link_method_set_llmnr, error);
 162 }
 163
 164 static int bus_method_set_link_mdns(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 165         return call_link_method(userdata, message, bus_link_method_set_mdns, error);
 166 }
 167
 168 static int bus_method_set_link_dns_over_tls(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 169         return call_link_method(userdata, message, bus_link_method_set_dns_over_tls, error);
 170 }
 171
 172 static int bus_method_set_link_dnssec(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 173         return call_link_method(userdata, message, bus_link_method_set_dnssec, error);
 174 }
 175
 176 static int bus_method_set_link_dnssec_negative_trust_anchors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 177         return call_link_method(userdata, message, bus_link_method_set_dnssec_negative_trust_anchors, error);
 178 }
 179
 180 static int bus_method_revert_link_ntp(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 181         return call_link_method(userdata, message, bus_link_method_revert_ntp, error);
 182 }
 183
 184 static int bus_method_revert_link_dns(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 185         return call_link_method(userdata, message, bus_link_method_revert_dns, error);
 186 }
 187
 188 static int bus_method_renew_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 189         return call_link_method(userdata, message, bus_link_method_renew, error);
 190 }
 191
 192 static int bus_method_force_renew_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 193         return call_link_method(userdata, message, bus_link_method_force_renew, error);
 194 }
 195
 196 static int bus_method_reconfigure_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 197         return call_link_method(userdata, message, bus_link_method_reconfigure, error);
 198 }
 199
 200 static int bus_method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 201         Manager *manager = ASSERT_PTR(userdata);
 202         int r;
 203
 204         if (manager->reloading > 0)
 205                 return sd_bus_error_set(error, BUS_ERROR_NETWORK_ALREADY_RELOADING, "Already reloading.");
 206
 207         r = bus_verify_polkit_async(
 208                         message,
 209                         "org.freedesktop.network1.reload",
 210                         /* details= */ NULL,
 211                         &manager->polkit_registry,
 212                         error);
 213         if (r < 0)
 214                 return r;
 215         if (r == 0)
 216                 return 1; /* Polkit will call us back */
 217
 218         r = manager_reload(manager, message);
 219         if (r < 0)
 220                 return r;
 221
 222         if (manager->reloading > 0)
 223                 return 1; /* Will reply later. */
 224
 225         return sd_bus_reply_method_return(message, NULL);
 226 }
 227
 228 static int bus_method_describe_link(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 229         return call_link_method(userdata, message, bus_link_method_describe, error);
 230 }
 231
 232 static int bus_method_describe(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 233         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 234         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
 235         _cleanup_free_ char *text = NULL;
 236         Manager *manager = ASSERT_PTR(userdata);
 237         int r;
 238
 239         assert(message);
 240
 241         r = manager_build_json(manager, &v);
 242         if (r < 0)
 243                 return log_error_errno(r, "Failed to build JSON data: %m");
 244
 245         r = json_variant_format(v, 0, &text);
 246         if (r < 0)
 247                 return log_error_errno(r, "Failed to format JSON data: %m");
 248
 249         r = sd_bus_message_new_method_return(message, &reply);
 250         if (r < 0)
 251                 return r;
 252
 253         r = sd_bus_message_append(reply, "s", text);
 254         if (r < 0)
 255                 return r;
 256
 257         return sd_bus_send(NULL, reply, NULL);
 258 }
 259
 260 static int property_get_namespace_id(
 261                 sd_bus *bus,
 262                 const char *path,
 263                 const char *interface,
 264                 const char *property,
 265                 sd_bus_message *reply,
 266                 void *userdata,
 267                 sd_bus_error *error) {
 268
 269         uint64_t id = 0;
 270         struct stat st;
 271
 272         assert(bus);
 273         assert(reply);
 274
 275         /* Returns our own network namespace ID, i.e. the inode number of /proc/self/ns/net. This allows
 276          * unprivileged clients to determine whether they are in the same network namespace as us (note that
 277          * access to that path is restricted, thus they can't check directly unless privileged). */
 278
 279         if (stat("/proc/self/ns/net", &st) < 0) {
 280                 log_warning_errno(errno, "Failed to stat network namespace, ignoring: %m");
 281                 id = 0;
 282         } else
 283                 id = st.st_ino;
 284
 285         return sd_bus_message_append(reply, "t", id);
 286 }
 287
 288 static int property_get_namespace_nsid(
 289                 sd_bus *bus,
 290                 const char *path,
 291                 const char *interface,
 292                 const char *property,
 293                 sd_bus_message *reply,
 294                 void *userdata,
 295                 sd_bus_error *error) {
 296
 297         uint32_t nsid = UINT32_MAX;
 298         int r;
 299
 300         assert(bus);
 301         assert(reply);
 302
 303         /* Returns our own "nsid", which is another ID for the network namespace, different from the inode
 304          * number. */
 305
 306         r = netns_get_nsid(/* netnsfd= */ -EBADF, &nsid);
 307         if (r < 0)
 308                 log_warning_errno(r, "Failed to query network nsid, ignoring: %m");
 309
 310         return sd_bus_message_append(reply, "u", nsid);
 311 }
 312
 313 static const sd_bus_vtable manager_vtable[] = {
 314         SD_BUS_VTABLE_START(0),
 315
 316         SD_BUS_PROPERTY("OperationalState", "s", property_get_operational_state, offsetof(Manager, operational_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 317         SD_BUS_PROPERTY("CarrierState", "s", property_get_carrier_state, offsetof(Manager, carrier_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 318         SD_BUS_PROPERTY("AddressState", "s", property_get_address_state, offsetof(Manager, address_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 319         SD_BUS_PROPERTY("IPv4AddressState", "s", property_get_address_state, offsetof(Manager, ipv4_address_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 320         SD_BUS_PROPERTY("IPv6AddressState", "s", property_get_address_state, offsetof(Manager, ipv6_address_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 321         SD_BUS_PROPERTY("OnlineState", "s", property_get_online_state, offsetof(Manager, online_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 322         SD_BUS_PROPERTY("NamespaceId", "t", property_get_namespace_id, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 323         SD_BUS_PROPERTY("NamespaceNSID", "u", property_get_namespace_nsid, 0, 0),
 324
 325         SD_BUS_METHOD_WITH_ARGS("ListLinks",
 326                                 SD_BUS_NO_ARGS,
 327                                 SD_BUS_RESULT("a(iso)", links),
 328                                 method_list_links,
 329                                 SD_BUS_VTABLE_UNPRIVILEGED),
 330         SD_BUS_METHOD_WITH_ARGS("GetLinkByName",
 331                                 SD_BUS_ARGS("s", name),
 332                                 SD_BUS_RESULT("i", ifindex, "o", path),
 333                                 method_get_link_by_name,
 334                                 SD_BUS_VTABLE_UNPRIVILEGED),
 335         SD_BUS_METHOD_WITH_ARGS("GetLinkByIndex",
 336                                 SD_BUS_ARGS("i", ifindex),
 337                                 SD_BUS_RESULT("s", name, "o", path),
 338                                 method_get_link_by_index,
 339                                 SD_BUS_VTABLE_UNPRIVILEGED),
 340         SD_BUS_METHOD_WITH_ARGS("SetLinkNTP",
 341                                 SD_BUS_ARGS("i", ifindex, "as", servers),
 342                                 SD_BUS_NO_RESULT,
 343                                 bus_method_set_link_ntp_servers,
 344                                 SD_BUS_VTABLE_UNPRIVILEGED),
 345         SD_BUS_METHOD_WITH_ARGS("SetLinkDNS",
 346                                 SD_BUS_ARGS("i", ifindex, "a(iay)", addresses),
 347                                 SD_BUS_NO_RESULT,
 348                                 bus_method_set_link_dns_servers,
 349                                 SD_BUS_VTABLE_UNPRIVILEGED),
 350         SD_BUS_METHOD_WITH_ARGS("SetLinkDNSEx",
 351                                 SD_BUS_ARGS("i", ifindex, "a(iayqs)", addresses),
 352                                 SD_BUS_NO_RESULT,
 353                                 bus_method_set_link_dns_servers_ex,
 354                                 SD_BUS_VTABLE_UNPRIVILEGED),
 355         SD_BUS_METHOD_WITH_ARGS("SetLinkDomains",
 356                                 SD_BUS_ARGS("i", ifindex, "a(sb)", domains),
 357                                 SD_BUS_NO_RESULT,
 358                                 bus_method_set_link_domains,
 359                                 SD_BUS_VTABLE_UNPRIVILEGED),
 360         SD_BUS_METHOD_WITH_ARGS("SetLinkDefaultRoute",
 361                                 SD_BUS_ARGS("i", ifindex, "b", enable),
 362                                 SD_BUS_NO_RESULT,
 363                                 bus_method_set_link_default_route,
 364                                 SD_BUS_VTABLE_UNPRIVILEGED),
 365         SD_BUS_METHOD_WITH_ARGS("SetLinkLLMNR",
 366                                 SD_BUS_ARGS("i", ifindex, "s", mode),
 367                                 SD_BUS_NO_RESULT,
 368                                 bus_method_set_link_llmnr,
 369                                 SD_BUS_VTABLE_UNPRIVILEGED),
 370         SD_BUS_METHOD_WITH_ARGS("SetLinkMulticastDNS",
 371                                 SD_BUS_ARGS("i", ifindex, "s", mode),
 372                                 SD_BUS_NO_RESULT,
 373                                 bus_method_set_link_mdns,
 374                                 SD_BUS_VTABLE_UNPRIVILEGED),
 375         SD_BUS_METHOD_WITH_ARGS("SetLinkDNSOverTLS",
 376                                 SD_BUS_ARGS("i", ifindex, "s", mode),
 377                                 SD_BUS_NO_RESULT,
 378                                 bus_method_set_link_dns_over_tls,
 379                                 SD_BUS_VTABLE_UNPRIVILEGED),
 380         SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSEC",
 381                                 SD_BUS_ARGS("i", ifindex, "s", mode),
 382                                 SD_BUS_NO_RESULT,
 383                                 bus_method_set_link_dnssec,
 384                                 SD_BUS_VTABLE_UNPRIVILEGED),
 385         SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSECNegativeTrustAnchors",
 386                                 SD_BUS_ARGS("i", ifindex, "as", names),
 387                                 SD_BUS_NO_RESULT,
 388                                 bus_method_set_link_dnssec_negative_trust_anchors,
 389                                 SD_BUS_VTABLE_UNPRIVILEGED),
 390         SD_BUS_METHOD_WITH_ARGS("RevertLinkNTP",
 391                                 SD_BUS_ARGS("i", ifindex),
 392                                 SD_BUS_NO_RESULT,
 393                                 bus_method_revert_link_ntp,
 394                                 SD_BUS_VTABLE_UNPRIVILEGED),
 395         SD_BUS_METHOD_WITH_ARGS("RevertLinkDNS",
 396                                 SD_BUS_ARGS("i", ifindex),
 397                                 SD_BUS_NO_RESULT,
 398                                 bus_method_revert_link_dns,
 399                                 SD_BUS_VTABLE_UNPRIVILEGED),
 400         SD_BUS_METHOD_WITH_ARGS("RenewLink",
 401                                 SD_BUS_ARGS("i", ifindex),
 402                                 SD_BUS_NO_RESULT,
 403                                 bus_method_renew_link,
 404                                 SD_BUS_VTABLE_UNPRIVILEGED),
 405         SD_BUS_METHOD_WITH_ARGS("ForceRenewLink",
 406                                 SD_BUS_ARGS("i", ifindex),
 407                                 SD_BUS_NO_RESULT,
 408                                 bus_method_force_renew_link,
 409                                 SD_BUS_VTABLE_UNPRIVILEGED),
 410         SD_BUS_METHOD_WITH_ARGS("ReconfigureLink",
 411                                 SD_BUS_ARGS("i", ifindex),
 412                                 SD_BUS_NO_RESULT,
 413                                 bus_method_reconfigure_link,
 414                                 SD_BUS_VTABLE_UNPRIVILEGED),
 415         SD_BUS_METHOD_WITH_ARGS("Reload",
 416                                 SD_BUS_NO_ARGS,
 417                                 SD_BUS_NO_RESULT,
 418                                 bus_method_reload,
 419                                 SD_BUS_VTABLE_UNPRIVILEGED),
 420         SD_BUS_METHOD_WITH_ARGS("DescribeLink",
 421                                 SD_BUS_ARGS("i", ifindex),
 422                                 SD_BUS_RESULT("s", json),
 423                                 bus_method_describe_link,
 424                                 SD_BUS_VTABLE_UNPRIVILEGED),
 425         SD_BUS_METHOD_WITH_ARGS("Describe",
 426                                 SD_BUS_NO_ARGS,
 427                                 SD_BUS_RESULT("s", json),
 428                                 bus_method_describe,
 429                                 SD_BUS_VTABLE_UNPRIVILEGED),
 430
 431         SD_BUS_VTABLE_END
 432 };
 433
 434 int manager_send_changed_strv(Manager *manager, char **properties) {
 435         assert(manager);
 436         assert(properties);
 437
 438         if (sd_bus_is_ready(manager->bus) <= 0)
 439                 return 0;
 440
 441         return sd_bus_emit_properties_changed_strv(
 442                         manager->bus,
 443                         "/org/freedesktop/network1",
 444                         "org.freedesktop.network1.Manager",
 445                         properties);
 446 }
 447
 448 const BusObjectImplementation manager_object = {
 449         "/org/freedesktop/network1",
 450         "org.freedesktop.network1.Manager",
 451         .vtables = BUS_VTABLES(manager_vtable),
 452         .children = BUS_IMPLEMENTATIONS(
 453                         &link_object, /* This is the main implementation for /org/freedesktop/network1/link,
 454                                        * and must be earlier than the dhcp objects below. */
 455                         &dhcp_server_object,
 456                         &dhcp_client_object,
 457                         &dhcp6_client_object,
 458                         &network_object),
 459 };