[thirdparty/systemd.git] / src / resolve / resolved-link-bus.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <net/if.h>

#include "sd-bus.h"

#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-get-properties.h"
#include "bus-message-util.h"
#include "bus-object.h"
#include "bus-polkit.h"
#include "dns-domain.h"
#include "log-link.h"
#include "parse-util.h"
#include "resolve-util.h"
#include "resolved-bus.h"
#include "resolved-def.h"
#include "resolved-dns-search-domain.h"
#include "resolved-dns-server.h"
#include "resolved-link.h"
#include "resolved-link-bus.h"
#include "resolved-llmnr.h"
#include "resolved-manager.h"
#include "resolved-mdns.h"
#include "resolved-resolv-conf.h"
#include "set.h"
#include "socket-netlink.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strv.h"

static BUS_DEFINE_PROPERTY_GET(property_get_dnssec_supported, "b", Link, link_dnssec_supported);
static BUS_DEFINE_PROPERTY_GET2(property_get_dnssec_mode, "s", Link, link_get_dnssec_mode, dnssec_mode_to_string);
static BUS_DEFINE_PROPERTY_GET2(property_get_llmnr_support, "s", Link, link_get_llmnr_support, resolve_support_to_string);
static BUS_DEFINE_PROPERTY_GET2(property_get_mdns_support, "s", Link, link_get_mdns_support, resolve_support_to_string);
static BUS_DEFINE_PROPERTY_GET(property_get_default_route, "b", Link, link_get_default_route);

static int property_get_dns_over_tls_mode(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Link *l = ASSERT_PTR(userdata);

        assert(reply);

        return sd_bus_message_append(reply, "s", dns_over_tls_mode_to_string(link_get_dns_over_tls_mode(l)));
}

static int property_get_dns_internal(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error,
                bool extended) {

        Link *l = ASSERT_PTR(userdata);
        int r;

        assert(reply);

        r = sd_bus_message_open_container(reply, 'a', extended ? "(iayqs)" : "(iay)");
        if (r < 0)
                return r;

        LIST_FOREACH(servers, s, l->dns_servers) {
                r = bus_dns_server_append(reply, s, false, extended);
                if (r < 0)
                        return r;
        }

        return sd_bus_message_close_container(reply);
}

static int property_get_dns(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {
        return property_get_dns_internal(bus, path, interface, property, reply, userdata, error, false);
}

static int property_get_dns_ex(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {
        return property_get_dns_internal(bus, path, interface, property, reply, userdata, error, true);
}

static int property_get_current_dns_server_internal(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error,
                bool extended) {

        DnsServer *s;

        assert(reply);
        assert(userdata);

        s = *(DnsServer **) userdata;

        return bus_dns_server_append(reply, s, false, extended);
}

static int property_get_current_dns_server(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {
        return property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, false);
}

static int property_get_current_dns_server_ex(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {
        return property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, true);
}

static int property_get_domains(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Link *l = ASSERT_PTR(userdata);
        int r;

        assert(reply);

        r = sd_bus_message_open_container(reply, 'a', "(sb)");
        if (r < 0)
                return r;

        LIST_FOREACH(domains, d, l->search_domains) {
                r = sd_bus_message_append(reply, "(sb)", d->name, d->route_only);
                if (r < 0)
                        return r;
        }

        return sd_bus_message_close_container(reply);
}

static int property_get_scopes_mask(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Link *l = ASSERT_PTR(userdata);
        uint64_t mask;

        assert(reply);

        mask =  (l->unicast_scope ? SD_RESOLVED_DNS : 0) |
                (l->llmnr_ipv4_scope ? SD_RESOLVED_LLMNR_IPV4 : 0) |
                (l->llmnr_ipv6_scope ? SD_RESOLVED_LLMNR_IPV6 : 0) |
                (l->mdns_ipv4_scope ? SD_RESOLVED_MDNS_IPV4 : 0) |
                (l->mdns_ipv6_scope ? SD_RESOLVED_MDNS_IPV6 : 0);

        return sd_bus_message_append(reply, "t", mask);
}

static int verify_unmanaged_link(Link *l, sd_bus_error *error) {
        assert(l);

        if (l->flags & IFF_LOOPBACK)
                return sd_bus_error_setf(error, BUS_ERROR_LINK_BUSY, "Link %s is loopback device.", l->ifname);
        if (l->is_managed)
                return sd_bus_error_setf(error, BUS_ERROR_LINK_BUSY, "Link %s is managed.", l->ifname);

        return 0;
}

static int bus_link_method_set_dns_servers_internal(sd_bus_message *message, void *userdata, sd_bus_error *error, bool extended) {
        _cleanup_free_ char *j = NULL;
        struct in_addr_full **dns;
        bool changed = false;
        Link *l = ASSERT_PTR(userdata);
        size_t n;
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = bus_message_read_dns_servers(message, error, extended, &dns, &n);
        if (r < 0)
                return r;

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-dns-servers",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry, error);
        if (r < 0)
                goto finalize;
        if (r == 0) {
                r = 1; /* Polkit will call us back */
                goto finalize;
        }

        for (size_t i = 0; i < n; i++) {
                const char *s;

                s = in_addr_full_to_string(dns[i]);
                if (!s) {
                        r = -ENOMEM;
                        goto finalize;
                }

                if (!strextend_with_separator(&j, ", ", s)) {
                        r = -ENOMEM;
                        goto finalize;
                }
        }

        bus_client_log(message, "DNS server change");

        dns_server_mark_all(l->dns_servers);

        for (size_t i = 0; i < n; i++) {
                DnsServer *s;

                s = dns_server_find(l->dns_servers, dns[i]->family, &dns[i]->address, dns[i]->port, 0, dns[i]->server_name);
                if (s)
                        dns_server_move_back_and_unmark(s);
                else {
                        r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, /* delegate= */ NULL, dns[i]->family, &dns[i]->address, dns[i]->port, 0, dns[i]->server_name, RESOLVE_CONFIG_SOURCE_DBUS);
                        if (r < 0) {
                                dns_server_unlink_all(l->dns_servers);
                                goto finalize;
                        }

                        changed = true;
                }
        }

        changed = dns_server_unlink_marked(l->dns_servers) || changed;

        if (changed) {
                link_allocate_scopes(l);

                (void) link_save_user(l);
                (void) manager_write_resolv_conf(l->manager);
                (void) manager_send_changed(l->manager, "DNS");
                (void) manager_send_dns_configuration_changed(l->manager, l, /* reset= */ true);

                if (j)
                        log_link_info(l, "Bus client set DNS server list to: %s", j);
                else
                        log_link_info(l, "Bus client reset DNS server list.");
        }

        r = sd_bus_reply_method_return(message, NULL);

finalize:
        for (size_t i = 0; i < n; i++)
                in_addr_full_free(dns[i]);
        free(dns);

        return r;
}

int bus_link_method_set_dns_servers(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        return bus_link_method_set_dns_servers_internal(message, userdata, error, false);
}

int bus_link_method_set_dns_servers_ex(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        return bus_link_method_set_dns_servers_internal(message, userdata, error, true);
}

int bus_link_method_set_domains(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_free_ char *j = NULL;
        Link *l = ASSERT_PTR(userdata);
        bool changed = false;
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = sd_bus_message_enter_container(message, 'a', "(sb)");
        if (r < 0)
                return r;

        for (;;) {
                _cleanup_free_ char *prefixed = NULL;
                const char *name;
                int route_only;

                r = sd_bus_message_read(message, "(sb)", &name, &route_only);
                if (r < 0)
                        return r;
                if (r == 0)
                        break;

                r = dns_name_is_valid(name);
                if (r < 0)
                        return r;
                if (r == 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid search domain %s", name);
                if (!route_only && dns_name_is_root(name))
                        return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Root domain is not suitable as search domain");

                if (route_only) {
                        prefixed = strjoin("~", name);
                        if (!prefixed)
                                return -ENOMEM;

                        name = prefixed;
                }

                if (!strextend_with_separator(&j, ", ", name))
                        return -ENOMEM;
        }

        r = sd_bus_message_rewind(message, false);
        if (r < 0)
                return r;

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-domains",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "dns domains change");

        dns_search_domain_mark_all(l->search_domains);

        for (;;) {
                DnsSearchDomain *d;
                const char *name;
                int route_only;

                r = sd_bus_message_read(message, "(sb)", &name, &route_only);
                if (r < 0)
                        goto clear;
                if (r == 0)
                        break;

                r = dns_search_domain_find(l->search_domains, name, &d);
                if (r < 0)
                        goto clear;

                if (r > 0)
                        dns_search_domain_move_back_and_unmark(d);
                else {
                        r = dns_search_domain_new(l->manager, &d, DNS_SEARCH_DOMAIN_LINK, l, /* delegate= */ NULL, name);
                        if (r < 0)
                                goto clear;

                        changed = true;
                }

                d->route_only = route_only;
        }

        r = sd_bus_message_exit_container(message);
        if (r < 0)
                goto clear;

        changed = dns_search_domain_unlink_marked(l->search_domains) || changed;

        if (changed) {
                (void) link_save_user(l);
                (void) manager_write_resolv_conf(l->manager);

                if (j)
                        log_link_info(l, "Bus client set search domain list to: %s", j);
                else
                        log_link_info(l, "Bus client reset search domain list.");
        }

        return sd_bus_reply_method_return(message, NULL);

clear:
        dns_search_domain_unlink_all(l->search_domains);
        return r;
}

int bus_link_method_set_default_route(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Link *l = ASSERT_PTR(userdata);
        int r, b;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = sd_bus_message_read(message, "b", &b);
        if (r < 0)
                return r;

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-default-route",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "dns default route change");

        if (l->default_route != b) {
                link_set_default_route(l, b);
                (void) link_save_user(l);
                (void) manager_write_resolv_conf(l->manager);

                log_link_info(l, "Bus client set default route setting: %s", yes_no(b));
        }

        return sd_bus_reply_method_return(message, NULL);
}

int bus_link_method_set_llmnr(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Link *l = ASSERT_PTR(userdata);
        ResolveSupport mode;
        const char *llmnr;
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = sd_bus_message_read(message, "s", &llmnr);
        if (r < 0)
                return r;

        if (isempty(llmnr))
                mode = RESOLVE_SUPPORT_YES;
        else {
                mode = resolve_support_from_string(llmnr);
                if (mode < 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid LLMNR setting: %s", llmnr);
        }

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-llmnr",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "LLMNR change");

        if (l->llmnr_support != mode) {
                l->llmnr_support = mode;
                link_allocate_scopes(l);
                link_add_rrs(l, false);

                (void) link_save_user(l);

                manager_llmnr_maybe_stop(l->manager);

                log_link_info(l, "Bus client set LLMNR setting: %s", resolve_support_to_string(mode));
        }

        return sd_bus_reply_method_return(message, NULL);
}

int bus_link_method_set_mdns(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Link *l = ASSERT_PTR(userdata);
        ResolveSupport mode;
        const char *mdns;
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = sd_bus_message_read(message, "s", &mdns);
        if (r < 0)
                return r;

        if (isempty(mdns))
                mode = RESOLVE_SUPPORT_YES;
        else {
                mode = resolve_support_from_string(mdns);
                if (mode < 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid MulticastDNS setting: %s", mdns);
        }

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-mdns",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "mDNS change");

        if (l->mdns_support != mode) {
                l->mdns_support = mode;
                link_allocate_scopes(l);
                link_add_rrs(l, false);

                (void) link_save_user(l);

                manager_mdns_maybe_stop(l->manager);

                log_link_info(l, "Bus client set MulticastDNS setting: %s", resolve_support_to_string(mode));
        }

        return sd_bus_reply_method_return(message, NULL);
}

int bus_link_method_set_dns_over_tls(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Link *l = ASSERT_PTR(userdata);
        const char *dns_over_tls;
        DnsOverTlsMode mode;
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = sd_bus_message_read(message, "s", &dns_over_tls);
        if (r < 0)
                return r;

        if (isempty(dns_over_tls))
                mode = _DNS_OVER_TLS_MODE_INVALID;
        else {
                mode = dns_over_tls_mode_from_string(dns_over_tls);
                if (mode < 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid DNSOverTLS setting: %s", dns_over_tls);
        }

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-dns-over-tls",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "D-o-T change");

        if (l->dns_over_tls_mode != mode) {
                link_set_dns_over_tls_mode(l, mode);
                link_allocate_scopes(l);

                (void) link_save_user(l);

                log_link_info(l, "Bus client set DNSOverTLS setting: %s",
                              mode < 0 ? "default" : dns_over_tls_mode_to_string(mode));
        }

        return sd_bus_reply_method_return(message, NULL);
}

int bus_link_method_set_dnssec(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Link *l = ASSERT_PTR(userdata);
        const char *dnssec;
        DnssecMode mode;
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = sd_bus_message_read(message, "s", &dnssec);
        if (r < 0)
                return r;

        if (isempty(dnssec))
                mode = _DNSSEC_MODE_INVALID;
        else {
                mode = dnssec_mode_from_string(dnssec);
                if (mode < 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid DNSSEC setting: %s", dnssec);
        }

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-dnssec",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "DNSSEC change");

        if (l->dnssec_mode != mode) {
                link_set_dnssec_mode(l, mode);
                link_allocate_scopes(l);

                (void) link_save_user(l);

                log_link_info(l, "Bus client set DNSSEC setting: %s",
                              mode < 0 ? "default" : dnssec_mode_to_string(mode));
        }

        return sd_bus_reply_method_return(message, NULL);
}

int bus_link_method_set_dnssec_negative_trust_anchors(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        _cleanup_set_free_ Set *ns = NULL;
        _cleanup_strv_free_ char **ntas = NULL;
        _cleanup_free_ char *j = NULL;
        Link *l = ASSERT_PTR(userdata);
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = sd_bus_message_read_strv(message, &ntas);
        if (r < 0)
                return r;

        STRV_FOREACH(i, ntas) {
                r = dns_name_is_valid(*i);
                if (r < 0)
                        return r;
                if (r == 0)
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
                                                 "Invalid negative trust anchor domain: %s", *i);

                r = set_put_strdup_full(&ns, &dns_name_hash_ops_free, *i);
                if (r < 0)
                        return r;

                if (!strextend_with_separator(&j, ", ", *i))
                        return -ENOMEM;
        }

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.set-dnssec-negative-trust-anchors",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "DNSSEC NTA change");

        if (!set_equal(ns, l->dnssec_negative_trust_anchors)) {
                set_free_and_replace(l->dnssec_negative_trust_anchors, ns);

                (void) link_save_user(l);

                if (j)
                        log_link_info(l, "Bus client set NTA list to: %s", j);
                else
                        log_link_info(l, "Bus client reset NTA list.");
        }

        return sd_bus_reply_method_return(message, NULL);
}

int bus_link_method_revert(sd_bus_message *message, void *userdata, sd_bus_error *error) {
        Link *l = ASSERT_PTR(userdata);
        int r;

        assert(message);

        r = verify_unmanaged_link(l, error);
        if (r < 0)
                return r;

        r = bus_verify_polkit_async(
                        message,
                        "org.freedesktop.resolve1.revert",
                        (const char**) STRV_MAKE("interface", l->ifname),
                        &l->manager->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* Polkit will call us back */

        bus_client_log(message, "revert");

        link_flush_settings(l);
        link_allocate_scopes(l);
        link_add_rrs(l, false);

        (void) link_save_user(l);
        (void) manager_write_resolv_conf(l->manager);
        (void) manager_send_changed(l->manager, "DNS");
        (void) manager_send_dns_configuration_changed(l->manager, l, /* reset= */ true);

        manager_llmnr_maybe_stop(l->manager);
        manager_mdns_maybe_stop(l->manager);

        return sd_bus_reply_method_return(message, NULL);
}

static int link_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
        _cleanup_free_ char *e = NULL;
        Manager *m = ASSERT_PTR(userdata);
        Link *link;
        int ifindex, r;

        assert(bus);
        assert(path);
        assert(interface);
        assert(found);

        r = sd_bus_path_decode(path, "/org/freedesktop/resolve1/link", &e);
        if (r <= 0)
                return 0;

        ifindex = parse_ifindex(e);
        if (ifindex < 0)
                return 0;

        link = hashmap_get(m->links, INT_TO_PTR(ifindex));
        if (!link)
                return 0;

        *found = link;
        return 1;
}

char* link_bus_path(const Link *link) {
        char *p, ifindex[DECIMAL_STR_MAX(link->ifindex)];
        int r;

        assert(link);

        xsprintf(ifindex, "%i", link->ifindex);

        r = sd_bus_path_encode("/org/freedesktop/resolve1/link", ifindex, &p);
        if (r < 0)
                return NULL;

        return p;
}

static int link_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
        _cleanup_strv_free_ char **l = NULL;
        Manager *m = ASSERT_PTR(userdata);
        Link *link;
        unsigned c = 0;

        assert(bus);
        assert(path);
        assert(nodes);

        l = new0(char*, hashmap_size(m->links) + 1);
        if (!l)
                return -ENOMEM;

        HASHMAP_FOREACH(link, m->links) {
                char *p;

                p = link_bus_path(link);
                if (!p)
                        return -ENOMEM;

                l[c++] = p;
        }

        l[c] = NULL;
        *nodes = TAKE_PTR(l);

        return 1;
}

static const sd_bus_vtable link_vtable[] = {
        SD_BUS_VTABLE_START(0),

        SD_BUS_PROPERTY("ScopesMask", "t", property_get_scopes_mask, 0, 0),
        SD_BUS_PROPERTY("DNS", "a(iay)", property_get_dns, 0, 0),
        SD_BUS_PROPERTY("DNSEx", "a(iayqs)", property_get_dns_ex, 0, 0),
        SD_BUS_PROPERTY("CurrentDNSServer", "(iay)", property_get_current_dns_server, offsetof(Link, current_dns_server), 0),
        SD_BUS_PROPERTY("CurrentDNSServerEx", "(iayqs)", property_get_current_dns_server_ex, offsetof(Link, current_dns_server), 0),
        SD_BUS_PROPERTY("Domains", "a(sb)", property_get_domains, 0, 0),
        SD_BUS_PROPERTY("DefaultRoute", "b", property_get_default_route, 0, 0),
        SD_BUS_PROPERTY("LLMNR", "s", property_get_llmnr_support, 0, 0),
        SD_BUS_PROPERTY("MulticastDNS", "s", property_get_mdns_support, 0, 0),
        SD_BUS_PROPERTY("DNSOverTLS", "s", property_get_dns_over_tls_mode, 0, 0),
        SD_BUS_PROPERTY("DNSSEC", "s", property_get_dnssec_mode, 0, 0),
        SD_BUS_PROPERTY("DNSSECNegativeTrustAnchors", "as", bus_property_get_string_set, offsetof(Link, dnssec_negative_trust_anchors), 0),
        SD_BUS_PROPERTY("DNSSECSupported", "b", property_get_dnssec_supported, 0, 0),

        SD_BUS_METHOD_WITH_ARGS("SetDNS",
                                SD_BUS_ARGS("a(iay)", addresses),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_dns_servers,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetDNSEx",
                                SD_BUS_ARGS("a(iayqs)", addresses),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_dns_servers_ex,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetDomains",
                                SD_BUS_ARGS("a(sb)", domains),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_domains,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetDefaultRoute",
                                SD_BUS_ARGS("b", enable),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_default_route,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetLLMNR",
                                SD_BUS_ARGS("s", mode),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_llmnr,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetMulticastDNS",
                                SD_BUS_ARGS("s", mode),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_mdns,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetDNSOverTLS",
                                SD_BUS_ARGS("s", mode),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_dns_over_tls,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetDNSSEC",
                                SD_BUS_ARGS("s", mode),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_dnssec,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("SetDNSSECNegativeTrustAnchors",
                                SD_BUS_ARGS("as", names),
                                SD_BUS_NO_RESULT,
                                bus_link_method_set_dnssec_negative_trust_anchors,
                                SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD_WITH_ARGS("Revert",
                                SD_BUS_NO_ARGS,
                                SD_BUS_NO_RESULT,
                                bus_link_method_revert,
                                SD_BUS_VTABLE_UNPRIVILEGED),

        SD_BUS_VTABLE_END
};

const BusObjectImplementation link_object = {
        "/org/freedesktop/resolve1/link",
        "org.freedesktop.resolve1.Link",
        .fallback_vtables = BUS_FALLBACK_VTABLES({link_vtable, link_object_find}),
        .node_enumerator = link_node_enumerator,
};